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);
740 __u64 ev1 = md_event(sb);
742 rdev->raid_disk = -1;
744 if (mddev->raid_disks == 0) {
745 mddev->major_version = 0;
746 mddev->minor_version = sb->minor_version;
747 mddev->patch_version = sb->patch_version;
748 mddev->persistent = ! sb->not_persistent;
749 mddev->chunk_size = sb->chunk_size;
750 mddev->ctime = sb->ctime;
751 mddev->utime = sb->utime;
752 mddev->level = sb->level;
753 mddev->clevel[0] = 0;
754 mddev->layout = sb->layout;
755 mddev->raid_disks = sb->raid_disks;
756 mddev->size = sb->size;
758 mddev->bitmap_offset = 0;
759 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
761 if (mddev->minor_version >= 91) {
762 mddev->reshape_position = sb->reshape_position;
763 mddev->delta_disks = sb->delta_disks;
764 mddev->new_level = sb->new_level;
765 mddev->new_layout = sb->new_layout;
766 mddev->new_chunk = sb->new_chunk;
768 mddev->reshape_position = MaxSector;
769 mddev->delta_disks = 0;
770 mddev->new_level = mddev->level;
771 mddev->new_layout = mddev->layout;
772 mddev->new_chunk = mddev->chunk_size;
775 if (sb->state & (1<<MD_SB_CLEAN))
776 mddev->recovery_cp = MaxSector;
778 if (sb->events_hi == sb->cp_events_hi &&
779 sb->events_lo == sb->cp_events_lo) {
780 mddev->recovery_cp = sb->recovery_cp;
782 mddev->recovery_cp = 0;
785 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
786 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
787 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
788 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
790 mddev->max_disks = MD_SB_DISKS;
792 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
793 mddev->bitmap_file == NULL) {
794 if (mddev->level != 1 && mddev->level != 4
795 && mddev->level != 5 && mddev->level != 6
796 && mddev->level != 10) {
797 /* FIXME use a better test */
798 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
801 mddev->bitmap_offset = mddev->default_bitmap_offset;
804 } else if (mddev->pers == NULL) {
805 /* Insist on good event counter while assembling */
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 if (ev1 < mddev->bitmap->events_cleared)
816 if (ev1 < mddev->events)
817 /* just a hot-add of a new device, leave raid_disk at -1 */
821 if (mddev->level != LEVEL_MULTIPATH) {
822 desc = sb->disks + rdev->desc_nr;
824 if (desc->state & (1<<MD_DISK_FAULTY))
825 set_bit(Faulty, &rdev->flags);
826 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
827 desc->raid_disk < mddev->raid_disks */) {
828 set_bit(In_sync, &rdev->flags);
829 rdev->raid_disk = desc->raid_disk;
831 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
832 set_bit(WriteMostly, &rdev->flags);
833 } else /* MULTIPATH are always insync */
834 set_bit(In_sync, &rdev->flags);
839 * sync_super for 0.90.0
841 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
844 struct list_head *tmp;
846 int next_spare = mddev->raid_disks;
849 /* make rdev->sb match mddev data..
852 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
853 * 3/ any empty disks < next_spare become removed
855 * disks[0] gets initialised to REMOVED because
856 * we cannot be sure from other fields if it has
857 * been initialised or not.
860 int active=0, working=0,failed=0,spare=0,nr_disks=0;
862 rdev->sb_size = MD_SB_BYTES;
864 sb = (mdp_super_t*)page_address(rdev->sb_page);
866 memset(sb, 0, sizeof(*sb));
868 sb->md_magic = MD_SB_MAGIC;
869 sb->major_version = mddev->major_version;
870 sb->patch_version = mddev->patch_version;
871 sb->gvalid_words = 0; /* ignored */
872 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
873 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
874 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
875 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
877 sb->ctime = mddev->ctime;
878 sb->level = mddev->level;
879 sb->size = mddev->size;
880 sb->raid_disks = mddev->raid_disks;
881 sb->md_minor = mddev->md_minor;
882 sb->not_persistent = !mddev->persistent;
883 sb->utime = mddev->utime;
885 sb->events_hi = (mddev->events>>32);
886 sb->events_lo = (u32)mddev->events;
888 if (mddev->reshape_position == MaxSector)
889 sb->minor_version = 90;
891 sb->minor_version = 91;
892 sb->reshape_position = mddev->reshape_position;
893 sb->new_level = mddev->new_level;
894 sb->delta_disks = mddev->delta_disks;
895 sb->new_layout = mddev->new_layout;
896 sb->new_chunk = mddev->new_chunk;
898 mddev->minor_version = sb->minor_version;
901 sb->recovery_cp = mddev->recovery_cp;
902 sb->cp_events_hi = (mddev->events>>32);
903 sb->cp_events_lo = (u32)mddev->events;
904 if (mddev->recovery_cp == MaxSector)
905 sb->state = (1<< MD_SB_CLEAN);
909 sb->layout = mddev->layout;
910 sb->chunk_size = mddev->chunk_size;
912 if (mddev->bitmap && mddev->bitmap_file == NULL)
913 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
915 sb->disks[0].state = (1<<MD_DISK_REMOVED);
916 ITERATE_RDEV(mddev,rdev2,tmp) {
919 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
920 && !test_bit(Faulty, &rdev2->flags))
921 desc_nr = rdev2->raid_disk;
923 desc_nr = next_spare++;
924 rdev2->desc_nr = desc_nr;
925 d = &sb->disks[rdev2->desc_nr];
927 d->number = rdev2->desc_nr;
928 d->major = MAJOR(rdev2->bdev->bd_dev);
929 d->minor = MINOR(rdev2->bdev->bd_dev);
930 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
931 && !test_bit(Faulty, &rdev2->flags))
932 d->raid_disk = rdev2->raid_disk;
934 d->raid_disk = rdev2->desc_nr; /* compatibility */
935 if (test_bit(Faulty, &rdev2->flags))
936 d->state = (1<<MD_DISK_FAULTY);
937 else if (test_bit(In_sync, &rdev2->flags)) {
938 d->state = (1<<MD_DISK_ACTIVE);
939 d->state |= (1<<MD_DISK_SYNC);
947 if (test_bit(WriteMostly, &rdev2->flags))
948 d->state |= (1<<MD_DISK_WRITEMOSTLY);
950 /* now set the "removed" and "faulty" bits on any missing devices */
951 for (i=0 ; i < mddev->raid_disks ; i++) {
952 mdp_disk_t *d = &sb->disks[i];
953 if (d->state == 0 && d->number == 0) {
956 d->state = (1<<MD_DISK_REMOVED);
957 d->state |= (1<<MD_DISK_FAULTY);
961 sb->nr_disks = nr_disks;
962 sb->active_disks = active;
963 sb->working_disks = working;
964 sb->failed_disks = failed;
965 sb->spare_disks = spare;
967 sb->this_disk = sb->disks[rdev->desc_nr];
968 sb->sb_csum = calc_sb_csum(sb);
972 * version 1 superblock
975 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
977 unsigned int disk_csum, csum;
978 unsigned long long newcsum;
979 int size = 256 + le32_to_cpu(sb->max_dev)*2;
980 unsigned int *isuper = (unsigned int*)sb;
983 disk_csum = sb->sb_csum;
986 for (i=0; size>=4; size -= 4 )
987 newcsum += le32_to_cpu(*isuper++);
990 newcsum += le16_to_cpu(*(unsigned short*) isuper);
992 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
993 sb->sb_csum = disk_csum;
994 return cpu_to_le32(csum);
997 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
999 struct mdp_superblock_1 *sb;
1002 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1006 * Calculate the position of the superblock.
1007 * It is always aligned to a 4K boundary and
1008 * depeding on minor_version, it can be:
1009 * 0: At least 8K, but less than 12K, from end of device
1010 * 1: At start of device
1011 * 2: 4K from start of device.
1013 switch(minor_version) {
1015 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1017 sb_offset &= ~(sector_t)(4*2-1);
1018 /* convert from sectors to K */
1030 rdev->sb_offset = sb_offset;
1032 /* superblock is rarely larger than 1K, but it can be larger,
1033 * and it is safe to read 4k, so we do that
1035 ret = read_disk_sb(rdev, 4096);
1036 if (ret) return ret;
1039 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1041 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1042 sb->major_version != cpu_to_le32(1) ||
1043 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1044 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1045 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1048 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1049 printk("md: invalid superblock checksum on %s\n",
1050 bdevname(rdev->bdev,b));
1053 if (le64_to_cpu(sb->data_size) < 10) {
1054 printk("md: data_size too small on %s\n",
1055 bdevname(rdev->bdev,b));
1058 rdev->preferred_minor = 0xffff;
1059 rdev->data_offset = le64_to_cpu(sb->data_offset);
1060 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1062 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1063 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1064 if (rdev->sb_size & bmask)
1065 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1071 struct mdp_superblock_1 *refsb =
1072 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1074 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1075 sb->level != refsb->level ||
1076 sb->layout != refsb->layout ||
1077 sb->chunksize != refsb->chunksize) {
1078 printk(KERN_WARNING "md: %s has strangely different"
1079 " superblock to %s\n",
1080 bdevname(rdev->bdev,b),
1081 bdevname(refdev->bdev,b2));
1084 ev1 = le64_to_cpu(sb->events);
1085 ev2 = le64_to_cpu(refsb->events);
1093 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1095 rdev->size = rdev->sb_offset;
1096 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1098 rdev->size = le64_to_cpu(sb->data_size)/2;
1099 if (le32_to_cpu(sb->chunksize))
1100 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1102 if (le32_to_cpu(sb->size) > rdev->size*2)
1107 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1109 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1110 __u64 ev1 = le64_to_cpu(sb->events);
1112 rdev->raid_disk = -1;
1114 if (mddev->raid_disks == 0) {
1115 mddev->major_version = 1;
1116 mddev->patch_version = 0;
1117 mddev->persistent = 1;
1118 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1119 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1120 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1121 mddev->level = le32_to_cpu(sb->level);
1122 mddev->clevel[0] = 0;
1123 mddev->layout = le32_to_cpu(sb->layout);
1124 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1125 mddev->size = le64_to_cpu(sb->size)/2;
1126 mddev->events = ev1;
1127 mddev->bitmap_offset = 0;
1128 mddev->default_bitmap_offset = 1024 >> 9;
1130 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1131 memcpy(mddev->uuid, sb->set_uuid, 16);
1133 mddev->max_disks = (4096-256)/2;
1135 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1136 mddev->bitmap_file == NULL ) {
1137 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1138 && mddev->level != 10) {
1139 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1142 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1144 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1145 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1146 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1147 mddev->new_level = le32_to_cpu(sb->new_level);
1148 mddev->new_layout = le32_to_cpu(sb->new_layout);
1149 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1151 mddev->reshape_position = MaxSector;
1152 mddev->delta_disks = 0;
1153 mddev->new_level = mddev->level;
1154 mddev->new_layout = mddev->layout;
1155 mddev->new_chunk = mddev->chunk_size;
1158 } else if (mddev->pers == NULL) {
1159 /* Insist of good event counter while assembling */
1161 if (ev1 < mddev->events)
1163 } else if (mddev->bitmap) {
1164 /* If adding to array with a bitmap, then we can accept an
1165 * older device, but not too old.
1167 if (ev1 < mddev->bitmap->events_cleared)
1170 if (ev1 < mddev->events)
1171 /* just a hot-add of a new device, leave raid_disk at -1 */
1174 if (mddev->level != LEVEL_MULTIPATH) {
1176 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1177 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1179 case 0xffff: /* spare */
1181 case 0xfffe: /* faulty */
1182 set_bit(Faulty, &rdev->flags);
1185 if ((le32_to_cpu(sb->feature_map) &
1186 MD_FEATURE_RECOVERY_OFFSET))
1187 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1189 set_bit(In_sync, &rdev->flags);
1190 rdev->raid_disk = role;
1193 if (sb->devflags & WriteMostly1)
1194 set_bit(WriteMostly, &rdev->flags);
1195 } else /* MULTIPATH are always insync */
1196 set_bit(In_sync, &rdev->flags);
1201 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1203 struct mdp_superblock_1 *sb;
1204 struct list_head *tmp;
1207 /* make rdev->sb match mddev and rdev data. */
1209 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1211 sb->feature_map = 0;
1213 sb->recovery_offset = cpu_to_le64(0);
1214 memset(sb->pad1, 0, sizeof(sb->pad1));
1215 memset(sb->pad2, 0, sizeof(sb->pad2));
1216 memset(sb->pad3, 0, sizeof(sb->pad3));
1218 sb->utime = cpu_to_le64((__u64)mddev->utime);
1219 sb->events = cpu_to_le64(mddev->events);
1221 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1223 sb->resync_offset = cpu_to_le64(0);
1225 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1227 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1228 sb->size = cpu_to_le64(mddev->size<<1);
1230 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1231 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1232 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1235 if (rdev->raid_disk >= 0 &&
1236 !test_bit(In_sync, &rdev->flags) &&
1237 rdev->recovery_offset > 0) {
1238 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1239 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1242 if (mddev->reshape_position != MaxSector) {
1243 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1244 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1245 sb->new_layout = cpu_to_le32(mddev->new_layout);
1246 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1247 sb->new_level = cpu_to_le32(mddev->new_level);
1248 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1252 ITERATE_RDEV(mddev,rdev2,tmp)
1253 if (rdev2->desc_nr+1 > max_dev)
1254 max_dev = rdev2->desc_nr+1;
1256 sb->max_dev = cpu_to_le32(max_dev);
1257 for (i=0; i<max_dev;i++)
1258 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1260 ITERATE_RDEV(mddev,rdev2,tmp) {
1262 if (test_bit(Faulty, &rdev2->flags))
1263 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1264 else if (test_bit(In_sync, &rdev2->flags))
1265 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1266 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1267 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1269 sb->dev_roles[i] = cpu_to_le16(0xffff);
1272 sb->sb_csum = calc_sb_1_csum(sb);
1276 static struct super_type super_types[] = {
1279 .owner = THIS_MODULE,
1280 .load_super = super_90_load,
1281 .validate_super = super_90_validate,
1282 .sync_super = super_90_sync,
1286 .owner = THIS_MODULE,
1287 .load_super = super_1_load,
1288 .validate_super = super_1_validate,
1289 .sync_super = super_1_sync,
1293 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1295 struct list_head *tmp;
1298 ITERATE_RDEV(mddev,rdev,tmp)
1299 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1305 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1307 struct list_head *tmp;
1310 ITERATE_RDEV(mddev1,rdev,tmp)
1311 if (match_dev_unit(mddev2, rdev))
1317 static LIST_HEAD(pending_raid_disks);
1319 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1321 mdk_rdev_t *same_pdev;
1322 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1330 /* make sure rdev->size exceeds mddev->size */
1331 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1333 /* Cannot change size, so fail */
1336 mddev->size = rdev->size;
1338 same_pdev = match_dev_unit(mddev, rdev);
1341 "%s: WARNING: %s appears to be on the same physical"
1342 " disk as %s. True\n protection against single-disk"
1343 " failure might be compromised.\n",
1344 mdname(mddev), bdevname(rdev->bdev,b),
1345 bdevname(same_pdev->bdev,b2));
1347 /* Verify rdev->desc_nr is unique.
1348 * If it is -1, assign a free number, else
1349 * check number is not in use
1351 if (rdev->desc_nr < 0) {
1353 if (mddev->pers) choice = mddev->raid_disks;
1354 while (find_rdev_nr(mddev, choice))
1356 rdev->desc_nr = choice;
1358 if (find_rdev_nr(mddev, rdev->desc_nr))
1361 bdevname(rdev->bdev,b);
1362 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1364 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1367 list_add(&rdev->same_set, &mddev->disks);
1368 rdev->mddev = mddev;
1369 printk(KERN_INFO "md: bind<%s>\n", b);
1371 rdev->kobj.parent = &mddev->kobj;
1372 kobject_add(&rdev->kobj);
1374 if (rdev->bdev->bd_part)
1375 ko = &rdev->bdev->bd_part->kobj;
1377 ko = &rdev->bdev->bd_disk->kobj;
1378 sysfs_create_link(&rdev->kobj, ko, "block");
1379 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1383 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1385 char b[BDEVNAME_SIZE];
1390 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1391 list_del_init(&rdev->same_set);
1392 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1394 sysfs_remove_link(&rdev->kobj, "block");
1395 kobject_del(&rdev->kobj);
1399 * prevent the device from being mounted, repartitioned or
1400 * otherwise reused by a RAID array (or any other kernel
1401 * subsystem), by bd_claiming the device.
1403 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1406 struct block_device *bdev;
1407 char b[BDEVNAME_SIZE];
1409 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1411 printk(KERN_ERR "md: could not open %s.\n",
1412 __bdevname(dev, b));
1413 return PTR_ERR(bdev);
1415 err = bd_claim(bdev, rdev);
1417 printk(KERN_ERR "md: could not bd_claim %s.\n",
1426 static void unlock_rdev(mdk_rdev_t *rdev)
1428 struct block_device *bdev = rdev->bdev;
1436 void md_autodetect_dev(dev_t dev);
1438 static void export_rdev(mdk_rdev_t * rdev)
1440 char b[BDEVNAME_SIZE];
1441 printk(KERN_INFO "md: export_rdev(%s)\n",
1442 bdevname(rdev->bdev,b));
1446 list_del_init(&rdev->same_set);
1448 md_autodetect_dev(rdev->bdev->bd_dev);
1451 kobject_put(&rdev->kobj);
1454 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1456 unbind_rdev_from_array(rdev);
1460 static void export_array(mddev_t *mddev)
1462 struct list_head *tmp;
1465 ITERATE_RDEV(mddev,rdev,tmp) {
1470 kick_rdev_from_array(rdev);
1472 if (!list_empty(&mddev->disks))
1474 mddev->raid_disks = 0;
1475 mddev->major_version = 0;
1478 static void print_desc(mdp_disk_t *desc)
1480 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1481 desc->major,desc->minor,desc->raid_disk,desc->state);
1484 static void print_sb(mdp_super_t *sb)
1489 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1490 sb->major_version, sb->minor_version, sb->patch_version,
1491 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1493 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1494 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1495 sb->md_minor, sb->layout, sb->chunk_size);
1496 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1497 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1498 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1499 sb->failed_disks, sb->spare_disks,
1500 sb->sb_csum, (unsigned long)sb->events_lo);
1503 for (i = 0; i < MD_SB_DISKS; i++) {
1506 desc = sb->disks + i;
1507 if (desc->number || desc->major || desc->minor ||
1508 desc->raid_disk || (desc->state && (desc->state != 4))) {
1509 printk(" D %2d: ", i);
1513 printk(KERN_INFO "md: THIS: ");
1514 print_desc(&sb->this_disk);
1518 static void print_rdev(mdk_rdev_t *rdev)
1520 char b[BDEVNAME_SIZE];
1521 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1522 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1523 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1525 if (rdev->sb_loaded) {
1526 printk(KERN_INFO "md: rdev superblock:\n");
1527 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1529 printk(KERN_INFO "md: no rdev superblock!\n");
1532 static void md_print_devices(void)
1534 struct list_head *tmp, *tmp2;
1537 char b[BDEVNAME_SIZE];
1540 printk("md: **********************************\n");
1541 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1542 printk("md: **********************************\n");
1543 ITERATE_MDDEV(mddev,tmp) {
1546 bitmap_print_sb(mddev->bitmap);
1548 printk("%s: ", mdname(mddev));
1549 ITERATE_RDEV(mddev,rdev,tmp2)
1550 printk("<%s>", bdevname(rdev->bdev,b));
1553 ITERATE_RDEV(mddev,rdev,tmp2)
1556 printk("md: **********************************\n");
1561 static void sync_sbs(mddev_t * mddev, int nospares)
1563 /* Update each superblock (in-memory image), but
1564 * if we are allowed to, skip spares which already
1565 * have the right event counter, or have one earlier
1566 * (which would mean they aren't being marked as dirty
1567 * with the rest of the array)
1570 struct list_head *tmp;
1572 ITERATE_RDEV(mddev,rdev,tmp) {
1573 if (rdev->sb_events == mddev->events ||
1575 rdev->raid_disk < 0 &&
1576 (rdev->sb_events&1)==0 &&
1577 rdev->sb_events+1 == mddev->events)) {
1578 /* Don't update this superblock */
1579 rdev->sb_loaded = 2;
1581 super_types[mddev->major_version].
1582 sync_super(mddev, rdev);
1583 rdev->sb_loaded = 1;
1588 void md_update_sb(mddev_t * mddev)
1591 struct list_head *tmp;
1597 spin_lock_irq(&mddev->write_lock);
1598 sync_req = mddev->in_sync;
1599 mddev->utime = get_seconds();
1600 if (mddev->sb_dirty == 3)
1601 /* just a clean<-> dirty transition, possibly leave spares alone,
1602 * though if events isn't the right even/odd, we will have to do
1607 /* If this is just a dirty<->clean transition, and the array is clean
1608 * and 'events' is odd, we can roll back to the previous clean state */
1609 if (mddev->sb_dirty == 3
1610 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1611 && (mddev->events & 1))
1614 /* otherwise we have to go forward and ... */
1616 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1617 /* .. if the array isn't clean, insist on an odd 'events' */
1618 if ((mddev->events&1)==0) {
1623 /* otherwise insist on an even 'events' (for clean states) */
1624 if ((mddev->events&1)) {
1631 if (!mddev->events) {
1633 * oops, this 64-bit counter should never wrap.
1634 * Either we are in around ~1 trillion A.C., assuming
1635 * 1 reboot per second, or we have a bug:
1640 mddev->sb_dirty = 2;
1641 sync_sbs(mddev, nospares);
1644 * do not write anything to disk if using
1645 * nonpersistent superblocks
1647 if (!mddev->persistent) {
1648 mddev->sb_dirty = 0;
1649 spin_unlock_irq(&mddev->write_lock);
1650 wake_up(&mddev->sb_wait);
1653 spin_unlock_irq(&mddev->write_lock);
1656 "md: updating %s RAID superblock on device (in sync %d)\n",
1657 mdname(mddev),mddev->in_sync);
1659 err = bitmap_update_sb(mddev->bitmap);
1660 ITERATE_RDEV(mddev,rdev,tmp) {
1661 char b[BDEVNAME_SIZE];
1662 dprintk(KERN_INFO "md: ");
1663 if (rdev->sb_loaded != 1)
1664 continue; /* no noise on spare devices */
1665 if (test_bit(Faulty, &rdev->flags))
1666 dprintk("(skipping faulty ");
1668 dprintk("%s ", bdevname(rdev->bdev,b));
1669 if (!test_bit(Faulty, &rdev->flags)) {
1670 md_super_write(mddev,rdev,
1671 rdev->sb_offset<<1, rdev->sb_size,
1673 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1674 bdevname(rdev->bdev,b),
1675 (unsigned long long)rdev->sb_offset);
1676 rdev->sb_events = mddev->events;
1680 if (mddev->level == LEVEL_MULTIPATH)
1681 /* only need to write one superblock... */
1684 md_super_wait(mddev);
1685 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1687 spin_lock_irq(&mddev->write_lock);
1688 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1689 /* have to write it out again */
1690 spin_unlock_irq(&mddev->write_lock);
1693 mddev->sb_dirty = 0;
1694 spin_unlock_irq(&mddev->write_lock);
1695 wake_up(&mddev->sb_wait);
1698 EXPORT_SYMBOL_GPL(md_update_sb);
1700 /* words written to sysfs files may, or my not, be \n terminated.
1701 * We want to accept with case. For this we use cmd_match.
1703 static int cmd_match(const char *cmd, const char *str)
1705 /* See if cmd, written into a sysfs file, matches
1706 * str. They must either be the same, or cmd can
1707 * have a trailing newline
1709 while (*cmd && *str && *cmd == *str) {
1720 struct rdev_sysfs_entry {
1721 struct attribute attr;
1722 ssize_t (*show)(mdk_rdev_t *, char *);
1723 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1727 state_show(mdk_rdev_t *rdev, char *page)
1732 if (test_bit(Faulty, &rdev->flags)) {
1733 len+= sprintf(page+len, "%sfaulty",sep);
1736 if (test_bit(In_sync, &rdev->flags)) {
1737 len += sprintf(page+len, "%sin_sync",sep);
1740 if (!test_bit(Faulty, &rdev->flags) &&
1741 !test_bit(In_sync, &rdev->flags)) {
1742 len += sprintf(page+len, "%sspare", sep);
1745 return len+sprintf(page+len, "\n");
1748 static struct rdev_sysfs_entry
1749 rdev_state = __ATTR_RO(state);
1752 super_show(mdk_rdev_t *rdev, char *page)
1754 if (rdev->sb_loaded && rdev->sb_size) {
1755 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1756 return rdev->sb_size;
1760 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1763 errors_show(mdk_rdev_t *rdev, char *page)
1765 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1769 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1772 unsigned long n = simple_strtoul(buf, &e, 10);
1773 if (*buf && (*e == 0 || *e == '\n')) {
1774 atomic_set(&rdev->corrected_errors, n);
1779 static struct rdev_sysfs_entry rdev_errors =
1780 __ATTR(errors, 0644, errors_show, errors_store);
1783 slot_show(mdk_rdev_t *rdev, char *page)
1785 if (rdev->raid_disk < 0)
1786 return sprintf(page, "none\n");
1788 return sprintf(page, "%d\n", rdev->raid_disk);
1792 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1795 int slot = simple_strtoul(buf, &e, 10);
1796 if (strncmp(buf, "none", 4)==0)
1798 else if (e==buf || (*e && *e!= '\n'))
1800 if (rdev->mddev->pers)
1801 /* Cannot set slot in active array (yet) */
1803 if (slot >= rdev->mddev->raid_disks)
1805 rdev->raid_disk = slot;
1806 /* assume it is working */
1808 set_bit(In_sync, &rdev->flags);
1813 static struct rdev_sysfs_entry rdev_slot =
1814 __ATTR(slot, 0644, slot_show, slot_store);
1817 offset_show(mdk_rdev_t *rdev, char *page)
1819 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1823 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1826 unsigned long long offset = simple_strtoull(buf, &e, 10);
1827 if (e==buf || (*e && *e != '\n'))
1829 if (rdev->mddev->pers)
1831 rdev->data_offset = offset;
1835 static struct rdev_sysfs_entry rdev_offset =
1836 __ATTR(offset, 0644, offset_show, offset_store);
1839 rdev_size_show(mdk_rdev_t *rdev, char *page)
1841 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1845 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1848 unsigned long long size = simple_strtoull(buf, &e, 10);
1849 if (e==buf || (*e && *e != '\n'))
1851 if (rdev->mddev->pers)
1854 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1855 rdev->mddev->size = size;
1859 static struct rdev_sysfs_entry rdev_size =
1860 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1862 static struct attribute *rdev_default_attrs[] = {
1872 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1874 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1875 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1879 return entry->show(rdev, page);
1883 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1884 const char *page, size_t length)
1886 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1887 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1891 return entry->store(rdev, page, length);
1894 static void rdev_free(struct kobject *ko)
1896 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1899 static struct sysfs_ops rdev_sysfs_ops = {
1900 .show = rdev_attr_show,
1901 .store = rdev_attr_store,
1903 static struct kobj_type rdev_ktype = {
1904 .release = rdev_free,
1905 .sysfs_ops = &rdev_sysfs_ops,
1906 .default_attrs = rdev_default_attrs,
1910 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1912 * mark the device faulty if:
1914 * - the device is nonexistent (zero size)
1915 * - the device has no valid superblock
1917 * a faulty rdev _never_ has rdev->sb set.
1919 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1921 char b[BDEVNAME_SIZE];
1926 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1928 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1929 return ERR_PTR(-ENOMEM);
1932 if ((err = alloc_disk_sb(rdev)))
1935 err = lock_rdev(rdev, newdev);
1939 rdev->kobj.parent = NULL;
1940 rdev->kobj.ktype = &rdev_ktype;
1941 kobject_init(&rdev->kobj);
1945 rdev->data_offset = 0;
1946 rdev->sb_events = 0;
1947 atomic_set(&rdev->nr_pending, 0);
1948 atomic_set(&rdev->read_errors, 0);
1949 atomic_set(&rdev->corrected_errors, 0);
1951 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1954 "md: %s has zero or unknown size, marking faulty!\n",
1955 bdevname(rdev->bdev,b));
1960 if (super_format >= 0) {
1961 err = super_types[super_format].
1962 load_super(rdev, NULL, super_minor);
1963 if (err == -EINVAL) {
1965 "md: %s has invalid sb, not importing!\n",
1966 bdevname(rdev->bdev,b));
1971 "md: could not read %s's sb, not importing!\n",
1972 bdevname(rdev->bdev,b));
1976 INIT_LIST_HEAD(&rdev->same_set);
1981 if (rdev->sb_page) {
1987 return ERR_PTR(err);
1991 * Check a full RAID array for plausibility
1995 static void analyze_sbs(mddev_t * mddev)
1998 struct list_head *tmp;
1999 mdk_rdev_t *rdev, *freshest;
2000 char b[BDEVNAME_SIZE];
2003 ITERATE_RDEV(mddev,rdev,tmp)
2004 switch (super_types[mddev->major_version].
2005 load_super(rdev, freshest, mddev->minor_version)) {
2013 "md: fatal superblock inconsistency in %s"
2014 " -- removing from array\n",
2015 bdevname(rdev->bdev,b));
2016 kick_rdev_from_array(rdev);
2020 super_types[mddev->major_version].
2021 validate_super(mddev, freshest);
2024 ITERATE_RDEV(mddev,rdev,tmp) {
2025 if (rdev != freshest)
2026 if (super_types[mddev->major_version].
2027 validate_super(mddev, rdev)) {
2028 printk(KERN_WARNING "md: kicking non-fresh %s"
2030 bdevname(rdev->bdev,b));
2031 kick_rdev_from_array(rdev);
2034 if (mddev->level == LEVEL_MULTIPATH) {
2035 rdev->desc_nr = i++;
2036 rdev->raid_disk = rdev->desc_nr;
2037 set_bit(In_sync, &rdev->flags);
2043 if (mddev->recovery_cp != MaxSector &&
2045 printk(KERN_ERR "md: %s: raid array is not clean"
2046 " -- starting background reconstruction\n",
2052 safe_delay_show(mddev_t *mddev, char *page)
2054 int msec = (mddev->safemode_delay*1000)/HZ;
2055 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2058 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2066 /* remove a period, and count digits after it */
2067 if (len >= sizeof(buf))
2069 strlcpy(buf, cbuf, len);
2071 for (i=0; i<len; i++) {
2073 if (isdigit(buf[i])) {
2078 } else if (buf[i] == '.') {
2083 msec = simple_strtoul(buf, &e, 10);
2084 if (e == buf || (*e && *e != '\n'))
2086 msec = (msec * 1000) / scale;
2088 mddev->safemode_delay = 0;
2090 mddev->safemode_delay = (msec*HZ)/1000;
2091 if (mddev->safemode_delay == 0)
2092 mddev->safemode_delay = 1;
2096 static struct md_sysfs_entry md_safe_delay =
2097 __ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store);
2100 level_show(mddev_t *mddev, char *page)
2102 struct mdk_personality *p = mddev->pers;
2104 return sprintf(page, "%s\n", p->name);
2105 else if (mddev->clevel[0])
2106 return sprintf(page, "%s\n", mddev->clevel);
2107 else if (mddev->level != LEVEL_NONE)
2108 return sprintf(page, "%d\n", mddev->level);
2114 level_store(mddev_t *mddev, const char *buf, size_t len)
2121 if (len >= sizeof(mddev->clevel))
2123 strncpy(mddev->clevel, buf, len);
2124 if (mddev->clevel[len-1] == '\n')
2126 mddev->clevel[len] = 0;
2127 mddev->level = LEVEL_NONE;
2131 static struct md_sysfs_entry md_level =
2132 __ATTR(level, 0644, level_show, level_store);
2135 raid_disks_show(mddev_t *mddev, char *page)
2137 if (mddev->raid_disks == 0)
2139 return sprintf(page, "%d\n", mddev->raid_disks);
2142 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2145 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2147 /* can only set raid_disks if array is not yet active */
2150 unsigned long n = simple_strtoul(buf, &e, 10);
2152 if (!*buf || (*e && *e != '\n'))
2156 rv = update_raid_disks(mddev, n);
2158 mddev->raid_disks = n;
2159 return rv ? rv : len;
2161 static struct md_sysfs_entry md_raid_disks =
2162 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
2165 chunk_size_show(mddev_t *mddev, char *page)
2167 return sprintf(page, "%d\n", mddev->chunk_size);
2171 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2173 /* can only set chunk_size if array is not yet active */
2175 unsigned long n = simple_strtoul(buf, &e, 10);
2179 if (!*buf || (*e && *e != '\n'))
2182 mddev->chunk_size = n;
2185 static struct md_sysfs_entry md_chunk_size =
2186 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2189 null_show(mddev_t *mddev, char *page)
2195 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2197 /* buf must be %d:%d\n? giving major and minor numbers */
2198 /* The new device is added to the array.
2199 * If the array has a persistent superblock, we read the
2200 * superblock to initialise info and check validity.
2201 * Otherwise, only checking done is that in bind_rdev_to_array,
2202 * which mainly checks size.
2205 int major = simple_strtoul(buf, &e, 10);
2211 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2213 minor = simple_strtoul(e+1, &e, 10);
2214 if (*e && *e != '\n')
2216 dev = MKDEV(major, minor);
2217 if (major != MAJOR(dev) ||
2218 minor != MINOR(dev))
2222 if (mddev->persistent) {
2223 rdev = md_import_device(dev, mddev->major_version,
2224 mddev->minor_version);
2225 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2226 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2227 mdk_rdev_t, same_set);
2228 err = super_types[mddev->major_version]
2229 .load_super(rdev, rdev0, mddev->minor_version);
2234 rdev = md_import_device(dev, -1, -1);
2237 return PTR_ERR(rdev);
2238 err = bind_rdev_to_array(rdev, mddev);
2242 return err ? err : len;
2245 static struct md_sysfs_entry md_new_device =
2246 __ATTR(new_dev, 0200, null_show, new_dev_store);
2249 size_show(mddev_t *mddev, char *page)
2251 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2254 static int update_size(mddev_t *mddev, unsigned long size);
2257 size_store(mddev_t *mddev, const char *buf, size_t len)
2259 /* If array is inactive, we can reduce the component size, but
2260 * not increase it (except from 0).
2261 * If array is active, we can try an on-line resize
2265 unsigned long long size = simple_strtoull(buf, &e, 10);
2266 if (!*buf || *buf == '\n' ||
2271 err = update_size(mddev, size);
2272 md_update_sb(mddev);
2274 if (mddev->size == 0 ||
2280 return err ? err : len;
2283 static struct md_sysfs_entry md_size =
2284 __ATTR(component_size, 0644, size_show, size_store);
2288 * This is either 'none' for arrays with externally managed metadata,
2289 * or N.M for internally known formats
2292 metadata_show(mddev_t *mddev, char *page)
2294 if (mddev->persistent)
2295 return sprintf(page, "%d.%d\n",
2296 mddev->major_version, mddev->minor_version);
2298 return sprintf(page, "none\n");
2302 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2306 if (!list_empty(&mddev->disks))
2309 if (cmd_match(buf, "none")) {
2310 mddev->persistent = 0;
2311 mddev->major_version = 0;
2312 mddev->minor_version = 90;
2315 major = simple_strtoul(buf, &e, 10);
2316 if (e==buf || *e != '.')
2319 minor = simple_strtoul(buf, &e, 10);
2320 if (e==buf || *e != '\n')
2322 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2323 super_types[major].name == NULL)
2325 mddev->major_version = major;
2326 mddev->minor_version = minor;
2327 mddev->persistent = 1;
2331 static struct md_sysfs_entry md_metadata =
2332 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2335 action_show(mddev_t *mddev, char *page)
2337 char *type = "idle";
2338 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2339 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2340 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2342 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2343 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2345 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2352 return sprintf(page, "%s\n", type);
2356 action_store(mddev_t *mddev, const char *page, size_t len)
2358 if (!mddev->pers || !mddev->pers->sync_request)
2361 if (cmd_match(page, "idle")) {
2362 if (mddev->sync_thread) {
2363 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2364 md_unregister_thread(mddev->sync_thread);
2365 mddev->sync_thread = NULL;
2366 mddev->recovery = 0;
2368 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2369 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2371 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2372 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2373 else if (cmd_match(page, "reshape")) {
2375 if (mddev->pers->start_reshape == NULL)
2377 err = mddev->pers->start_reshape(mddev);
2381 if (cmd_match(page, "check"))
2382 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2383 else if (!cmd_match(page, "repair"))
2385 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2386 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2388 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2389 md_wakeup_thread(mddev->thread);
2394 mismatch_cnt_show(mddev_t *mddev, char *page)
2396 return sprintf(page, "%llu\n",
2397 (unsigned long long) mddev->resync_mismatches);
2400 static struct md_sysfs_entry
2401 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2404 static struct md_sysfs_entry
2405 md_mismatches = __ATTR_RO(mismatch_cnt);
2408 sync_min_show(mddev_t *mddev, char *page)
2410 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2411 mddev->sync_speed_min ? "local": "system");
2415 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2419 if (strncmp(buf, "system", 6)==0) {
2420 mddev->sync_speed_min = 0;
2423 min = simple_strtoul(buf, &e, 10);
2424 if (buf == e || (*e && *e != '\n') || min <= 0)
2426 mddev->sync_speed_min = min;
2430 static struct md_sysfs_entry md_sync_min =
2431 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2434 sync_max_show(mddev_t *mddev, char *page)
2436 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2437 mddev->sync_speed_max ? "local": "system");
2441 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2445 if (strncmp(buf, "system", 6)==0) {
2446 mddev->sync_speed_max = 0;
2449 max = simple_strtoul(buf, &e, 10);
2450 if (buf == e || (*e && *e != '\n') || max <= 0)
2452 mddev->sync_speed_max = max;
2456 static struct md_sysfs_entry md_sync_max =
2457 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2461 sync_speed_show(mddev_t *mddev, char *page)
2463 unsigned long resync, dt, db;
2464 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2465 dt = ((jiffies - mddev->resync_mark) / HZ);
2467 db = resync - (mddev->resync_mark_cnt);
2468 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2471 static struct md_sysfs_entry
2472 md_sync_speed = __ATTR_RO(sync_speed);
2475 sync_completed_show(mddev_t *mddev, char *page)
2477 unsigned long max_blocks, resync;
2479 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2480 max_blocks = mddev->resync_max_sectors;
2482 max_blocks = mddev->size << 1;
2484 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2485 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2488 static struct md_sysfs_entry
2489 md_sync_completed = __ATTR_RO(sync_completed);
2492 suspend_lo_show(mddev_t *mddev, char *page)
2494 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2498 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2501 unsigned long long new = simple_strtoull(buf, &e, 10);
2503 if (mddev->pers->quiesce == NULL)
2505 if (buf == e || (*e && *e != '\n'))
2507 if (new >= mddev->suspend_hi ||
2508 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2509 mddev->suspend_lo = new;
2510 mddev->pers->quiesce(mddev, 2);
2515 static struct md_sysfs_entry md_suspend_lo =
2516 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2520 suspend_hi_show(mddev_t *mddev, char *page)
2522 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2526 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2529 unsigned long long new = simple_strtoull(buf, &e, 10);
2531 if (mddev->pers->quiesce == NULL)
2533 if (buf == e || (*e && *e != '\n'))
2535 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2536 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2537 mddev->suspend_hi = new;
2538 mddev->pers->quiesce(mddev, 1);
2539 mddev->pers->quiesce(mddev, 0);
2544 static struct md_sysfs_entry md_suspend_hi =
2545 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2548 static struct attribute *md_default_attrs[] = {
2550 &md_raid_disks.attr,
2551 &md_chunk_size.attr,
2554 &md_new_device.attr,
2555 &md_safe_delay.attr,
2559 static struct attribute *md_redundancy_attrs[] = {
2561 &md_mismatches.attr,
2564 &md_sync_speed.attr,
2565 &md_sync_completed.attr,
2566 &md_suspend_lo.attr,
2567 &md_suspend_hi.attr,
2570 static struct attribute_group md_redundancy_group = {
2572 .attrs = md_redundancy_attrs,
2577 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2579 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2580 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2585 rv = mddev_lock(mddev);
2587 rv = entry->show(mddev, page);
2588 mddev_unlock(mddev);
2594 md_attr_store(struct kobject *kobj, struct attribute *attr,
2595 const char *page, size_t length)
2597 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2598 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2603 rv = mddev_lock(mddev);
2605 rv = entry->store(mddev, page, length);
2606 mddev_unlock(mddev);
2611 static void md_free(struct kobject *ko)
2613 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2617 static struct sysfs_ops md_sysfs_ops = {
2618 .show = md_attr_show,
2619 .store = md_attr_store,
2621 static struct kobj_type md_ktype = {
2623 .sysfs_ops = &md_sysfs_ops,
2624 .default_attrs = md_default_attrs,
2629 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2631 static DEFINE_MUTEX(disks_mutex);
2632 mddev_t *mddev = mddev_find(dev);
2633 struct gendisk *disk;
2634 int partitioned = (MAJOR(dev) != MD_MAJOR);
2635 int shift = partitioned ? MdpMinorShift : 0;
2636 int unit = MINOR(dev) >> shift;
2641 mutex_lock(&disks_mutex);
2642 if (mddev->gendisk) {
2643 mutex_unlock(&disks_mutex);
2647 disk = alloc_disk(1 << shift);
2649 mutex_unlock(&disks_mutex);
2653 disk->major = MAJOR(dev);
2654 disk->first_minor = unit << shift;
2656 sprintf(disk->disk_name, "md_d%d", unit);
2657 sprintf(disk->devfs_name, "md/d%d", unit);
2659 sprintf(disk->disk_name, "md%d", unit);
2660 sprintf(disk->devfs_name, "md/%d", unit);
2662 disk->fops = &md_fops;
2663 disk->private_data = mddev;
2664 disk->queue = mddev->queue;
2666 mddev->gendisk = disk;
2667 mutex_unlock(&disks_mutex);
2668 mddev->kobj.parent = &disk->kobj;
2669 mddev->kobj.k_name = NULL;
2670 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2671 mddev->kobj.ktype = &md_ktype;
2672 kobject_register(&mddev->kobj);
2676 static void md_safemode_timeout(unsigned long data)
2678 mddev_t *mddev = (mddev_t *) data;
2680 mddev->safemode = 1;
2681 md_wakeup_thread(mddev->thread);
2684 static int start_dirty_degraded;
2686 static int do_md_run(mddev_t * mddev)
2690 struct list_head *tmp;
2692 struct gendisk *disk;
2693 struct mdk_personality *pers;
2694 char b[BDEVNAME_SIZE];
2696 if (list_empty(&mddev->disks))
2697 /* cannot run an array with no devices.. */
2704 * Analyze all RAID superblock(s)
2706 if (!mddev->raid_disks)
2709 chunk_size = mddev->chunk_size;
2712 if (chunk_size > MAX_CHUNK_SIZE) {
2713 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2714 chunk_size, MAX_CHUNK_SIZE);
2718 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2720 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2721 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2724 if (chunk_size < PAGE_SIZE) {
2725 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2726 chunk_size, PAGE_SIZE);
2730 /* devices must have minimum size of one chunk */
2731 ITERATE_RDEV(mddev,rdev,tmp) {
2732 if (test_bit(Faulty, &rdev->flags))
2734 if (rdev->size < chunk_size / 1024) {
2736 "md: Dev %s smaller than chunk_size:"
2738 bdevname(rdev->bdev,b),
2739 (unsigned long long)rdev->size,
2747 if (mddev->level != LEVEL_NONE)
2748 request_module("md-level-%d", mddev->level);
2749 else if (mddev->clevel[0])
2750 request_module("md-%s", mddev->clevel);
2754 * Drop all container device buffers, from now on
2755 * the only valid external interface is through the md
2757 * Also find largest hardsector size
2759 ITERATE_RDEV(mddev,rdev,tmp) {
2760 if (test_bit(Faulty, &rdev->flags))
2762 sync_blockdev(rdev->bdev);
2763 invalidate_bdev(rdev->bdev, 0);
2766 md_probe(mddev->unit, NULL, NULL);
2767 disk = mddev->gendisk;
2771 spin_lock(&pers_lock);
2772 pers = find_pers(mddev->level, mddev->clevel);
2773 if (!pers || !try_module_get(pers->owner)) {
2774 spin_unlock(&pers_lock);
2775 if (mddev->level != LEVEL_NONE)
2776 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2779 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2784 spin_unlock(&pers_lock);
2785 mddev->level = pers->level;
2786 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2788 if (mddev->reshape_position != MaxSector &&
2789 pers->start_reshape == NULL) {
2790 /* This personality cannot handle reshaping... */
2792 module_put(pers->owner);
2796 mddev->recovery = 0;
2797 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2798 mddev->barriers_work = 1;
2799 mddev->ok_start_degraded = start_dirty_degraded;
2802 mddev->ro = 2; /* read-only, but switch on first write */
2804 err = mddev->pers->run(mddev);
2805 if (!err && mddev->pers->sync_request) {
2806 err = bitmap_create(mddev);
2808 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2809 mdname(mddev), err);
2810 mddev->pers->stop(mddev);
2814 printk(KERN_ERR "md: pers->run() failed ...\n");
2815 module_put(mddev->pers->owner);
2817 bitmap_destroy(mddev);
2820 if (mddev->pers->sync_request)
2821 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2822 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2825 atomic_set(&mddev->writes_pending,0);
2826 mddev->safemode = 0;
2827 mddev->safemode_timer.function = md_safemode_timeout;
2828 mddev->safemode_timer.data = (unsigned long) mddev;
2829 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
2832 ITERATE_RDEV(mddev,rdev,tmp)
2833 if (rdev->raid_disk >= 0) {
2835 sprintf(nm, "rd%d", rdev->raid_disk);
2836 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2839 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2840 md_wakeup_thread(mddev->thread);
2842 if (mddev->sb_dirty)
2843 md_update_sb(mddev);
2845 set_capacity(disk, mddev->array_size<<1);
2847 /* If we call blk_queue_make_request here, it will
2848 * re-initialise max_sectors etc which may have been
2849 * refined inside -> run. So just set the bits we need to set.
2850 * Most initialisation happended when we called
2851 * blk_queue_make_request(..., md_fail_request)
2854 mddev->queue->queuedata = mddev;
2855 mddev->queue->make_request_fn = mddev->pers->make_request;
2857 /* If there is a partially-recovered drive we need to
2858 * start recovery here. If we leave it to md_check_recovery,
2859 * it will remove the drives and not do the right thing
2861 if (mddev->degraded) {
2862 struct list_head *rtmp;
2864 ITERATE_RDEV(mddev,rdev,rtmp)
2865 if (rdev->raid_disk >= 0 &&
2866 !test_bit(In_sync, &rdev->flags) &&
2867 !test_bit(Faulty, &rdev->flags))
2868 /* complete an interrupted recovery */
2870 if (spares && mddev->pers->sync_request) {
2871 mddev->recovery = 0;
2872 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
2873 mddev->sync_thread = md_register_thread(md_do_sync,
2876 if (!mddev->sync_thread) {
2877 printk(KERN_ERR "%s: could not start resync"
2880 /* leave the spares where they are, it shouldn't hurt */
2881 mddev->recovery = 0;
2883 md_wakeup_thread(mddev->sync_thread);
2888 md_new_event(mddev);
2892 static int restart_array(mddev_t *mddev)
2894 struct gendisk *disk = mddev->gendisk;
2898 * Complain if it has no devices
2901 if (list_empty(&mddev->disks))
2909 mddev->safemode = 0;
2911 set_disk_ro(disk, 0);
2913 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2916 * Kick recovery or resync if necessary
2918 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2919 md_wakeup_thread(mddev->thread);
2920 md_wakeup_thread(mddev->sync_thread);
2923 printk(KERN_ERR "md: %s has no personality assigned.\n",
2932 /* similar to deny_write_access, but accounts for our holding a reference
2933 * to the file ourselves */
2934 static int deny_bitmap_write_access(struct file * file)
2936 struct inode *inode = file->f_mapping->host;
2938 spin_lock(&inode->i_lock);
2939 if (atomic_read(&inode->i_writecount) > 1) {
2940 spin_unlock(&inode->i_lock);
2943 atomic_set(&inode->i_writecount, -1);
2944 spin_unlock(&inode->i_lock);
2949 static void restore_bitmap_write_access(struct file *file)
2951 struct inode *inode = file->f_mapping->host;
2953 spin_lock(&inode->i_lock);
2954 atomic_set(&inode->i_writecount, 1);
2955 spin_unlock(&inode->i_lock);
2958 static int do_md_stop(mddev_t * mddev, int ro)
2961 struct gendisk *disk = mddev->gendisk;
2964 if (atomic_read(&mddev->active)>2) {
2965 printk("md: %s still in use.\n",mdname(mddev));
2969 if (mddev->sync_thread) {
2970 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
2971 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2972 md_unregister_thread(mddev->sync_thread);
2973 mddev->sync_thread = NULL;
2976 del_timer_sync(&mddev->safemode_timer);
2978 invalidate_partition(disk, 0);
2986 bitmap_flush(mddev);
2987 md_super_wait(mddev);
2989 set_disk_ro(disk, 0);
2990 blk_queue_make_request(mddev->queue, md_fail_request);
2991 mddev->pers->stop(mddev);
2992 if (mddev->pers->sync_request)
2993 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2995 module_put(mddev->pers->owner);
3000 if (!mddev->in_sync || mddev->sb_dirty) {
3001 /* mark array as shutdown cleanly */
3003 md_update_sb(mddev);
3006 set_disk_ro(disk, 1);
3007 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3011 * Free resources if final stop
3015 struct list_head *tmp;
3016 struct gendisk *disk;
3017 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3019 bitmap_destroy(mddev);
3020 if (mddev->bitmap_file) {
3021 restore_bitmap_write_access(mddev->bitmap_file);
3022 fput(mddev->bitmap_file);
3023 mddev->bitmap_file = NULL;
3025 mddev->bitmap_offset = 0;
3027 ITERATE_RDEV(mddev,rdev,tmp)
3028 if (rdev->raid_disk >= 0) {
3030 sprintf(nm, "rd%d", rdev->raid_disk);
3031 sysfs_remove_link(&mddev->kobj, nm);
3034 export_array(mddev);
3036 mddev->array_size = 0;
3037 disk = mddev->gendisk;
3039 set_capacity(disk, 0);
3041 } else if (mddev->pers)
3042 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3045 md_new_event(mddev);
3050 static void autorun_array(mddev_t *mddev)
3053 struct list_head *tmp;
3056 if (list_empty(&mddev->disks))
3059 printk(KERN_INFO "md: running: ");
3061 ITERATE_RDEV(mddev,rdev,tmp) {
3062 char b[BDEVNAME_SIZE];
3063 printk("<%s>", bdevname(rdev->bdev,b));
3067 err = do_md_run (mddev);
3069 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3070 do_md_stop (mddev, 0);
3075 * lets try to run arrays based on all disks that have arrived
3076 * until now. (those are in pending_raid_disks)
3078 * the method: pick the first pending disk, collect all disks with
3079 * the same UUID, remove all from the pending list and put them into
3080 * the 'same_array' list. Then order this list based on superblock
3081 * update time (freshest comes first), kick out 'old' disks and
3082 * compare superblocks. If everything's fine then run it.
3084 * If "unit" is allocated, then bump its reference count
3086 static void autorun_devices(int part)
3088 struct list_head *tmp;
3089 mdk_rdev_t *rdev0, *rdev;
3091 char b[BDEVNAME_SIZE];
3093 printk(KERN_INFO "md: autorun ...\n");
3094 while (!list_empty(&pending_raid_disks)) {
3096 LIST_HEAD(candidates);
3097 rdev0 = list_entry(pending_raid_disks.next,
3098 mdk_rdev_t, same_set);
3100 printk(KERN_INFO "md: considering %s ...\n",
3101 bdevname(rdev0->bdev,b));
3102 INIT_LIST_HEAD(&candidates);
3103 ITERATE_RDEV_PENDING(rdev,tmp)
3104 if (super_90_load(rdev, rdev0, 0) >= 0) {
3105 printk(KERN_INFO "md: adding %s ...\n",
3106 bdevname(rdev->bdev,b));
3107 list_move(&rdev->same_set, &candidates);
3110 * now we have a set of devices, with all of them having
3111 * mostly sane superblocks. It's time to allocate the
3114 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3115 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3116 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3120 dev = MKDEV(mdp_major,
3121 rdev0->preferred_minor << MdpMinorShift);
3123 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3125 md_probe(dev, NULL, NULL);
3126 mddev = mddev_find(dev);
3129 "md: cannot allocate memory for md drive.\n");
3132 if (mddev_lock(mddev))
3133 printk(KERN_WARNING "md: %s locked, cannot run\n",
3135 else if (mddev->raid_disks || mddev->major_version
3136 || !list_empty(&mddev->disks)) {
3138 "md: %s already running, cannot run %s\n",
3139 mdname(mddev), bdevname(rdev0->bdev,b));
3140 mddev_unlock(mddev);
3142 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3143 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3144 list_del_init(&rdev->same_set);
3145 if (bind_rdev_to_array(rdev, mddev))
3148 autorun_array(mddev);
3149 mddev_unlock(mddev);
3151 /* on success, candidates will be empty, on error
3154 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3158 printk(KERN_INFO "md: ... autorun DONE.\n");
3162 * import RAID devices based on one partition
3163 * if possible, the array gets run as well.
3166 static int autostart_array(dev_t startdev)
3168 char b[BDEVNAME_SIZE];
3169 int err = -EINVAL, i;
3170 mdp_super_t *sb = NULL;
3171 mdk_rdev_t *start_rdev = NULL, *rdev;
3173 start_rdev = md_import_device(startdev, 0, 0);
3174 if (IS_ERR(start_rdev))
3178 /* NOTE: this can only work for 0.90.0 superblocks */
3179 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
3180 if (sb->major_version != 0 ||
3181 sb->minor_version != 90 ) {
3182 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
3183 export_rdev(start_rdev);
3187 if (test_bit(Faulty, &start_rdev->flags)) {
3189 "md: can not autostart based on faulty %s!\n",
3190 bdevname(start_rdev->bdev,b));
3191 export_rdev(start_rdev);
3194 list_add(&start_rdev->same_set, &pending_raid_disks);
3196 for (i = 0; i < MD_SB_DISKS; i++) {
3197 mdp_disk_t *desc = sb->disks + i;
3198 dev_t dev = MKDEV(desc->major, desc->minor);
3202 if (dev == startdev)
3204 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3206 rdev = md_import_device(dev, 0, 0);
3210 list_add(&rdev->same_set, &pending_raid_disks);
3214 * possibly return codes
3222 static int get_version(void __user * arg)
3226 ver.major = MD_MAJOR_VERSION;
3227 ver.minor = MD_MINOR_VERSION;
3228 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3230 if (copy_to_user(arg, &ver, sizeof(ver)))
3236 static int get_array_info(mddev_t * mddev, void __user * arg)
3238 mdu_array_info_t info;
3239 int nr,working,active,failed,spare;
3241 struct list_head *tmp;
3243 nr=working=active=failed=spare=0;
3244 ITERATE_RDEV(mddev,rdev,tmp) {
3246 if (test_bit(Faulty, &rdev->flags))
3250 if (test_bit(In_sync, &rdev->flags))
3257 info.major_version = mddev->major_version;
3258 info.minor_version = mddev->minor_version;
3259 info.patch_version = MD_PATCHLEVEL_VERSION;
3260 info.ctime = mddev->ctime;
3261 info.level = mddev->level;
3262 info.size = mddev->size;
3263 if (info.size != mddev->size) /* overflow */
3266 info.raid_disks = mddev->raid_disks;
3267 info.md_minor = mddev->md_minor;
3268 info.not_persistent= !mddev->persistent;
3270 info.utime = mddev->utime;
3273 info.state = (1<<MD_SB_CLEAN);
3274 if (mddev->bitmap && mddev->bitmap_offset)
3275 info.state = (1<<MD_SB_BITMAP_PRESENT);
3276 info.active_disks = active;
3277 info.working_disks = working;
3278 info.failed_disks = failed;
3279 info.spare_disks = spare;
3281 info.layout = mddev->layout;
3282 info.chunk_size = mddev->chunk_size;
3284 if (copy_to_user(arg, &info, sizeof(info)))
3290 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3292 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3293 char *ptr, *buf = NULL;
3296 file = kmalloc(sizeof(*file), GFP_KERNEL);
3300 /* bitmap disabled, zero the first byte and copy out */
3301 if (!mddev->bitmap || !mddev->bitmap->file) {
3302 file->pathname[0] = '\0';
3306 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3310 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3314 strcpy(file->pathname, ptr);
3318 if (copy_to_user(arg, file, sizeof(*file)))
3326 static int get_disk_info(mddev_t * mddev, void __user * arg)
3328 mdu_disk_info_t info;
3332 if (copy_from_user(&info, arg, sizeof(info)))
3337 rdev = find_rdev_nr(mddev, nr);
3339 info.major = MAJOR(rdev->bdev->bd_dev);
3340 info.minor = MINOR(rdev->bdev->bd_dev);
3341 info.raid_disk = rdev->raid_disk;
3343 if (test_bit(Faulty, &rdev->flags))
3344 info.state |= (1<<MD_DISK_FAULTY);
3345 else if (test_bit(In_sync, &rdev->flags)) {
3346 info.state |= (1<<MD_DISK_ACTIVE);
3347 info.state |= (1<<MD_DISK_SYNC);
3349 if (test_bit(WriteMostly, &rdev->flags))
3350 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3352 info.major = info.minor = 0;
3353 info.raid_disk = -1;
3354 info.state = (1<<MD_DISK_REMOVED);
3357 if (copy_to_user(arg, &info, sizeof(info)))
3363 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3365 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3367 dev_t dev = MKDEV(info->major,info->minor);
3369 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3372 if (!mddev->raid_disks) {
3374 /* expecting a device which has a superblock */
3375 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3378 "md: md_import_device returned %ld\n",
3380 return PTR_ERR(rdev);
3382 if (!list_empty(&mddev->disks)) {
3383 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3384 mdk_rdev_t, same_set);
3385 int err = super_types[mddev->major_version]
3386 .load_super(rdev, rdev0, mddev->minor_version);
3389 "md: %s has different UUID to %s\n",
3390 bdevname(rdev->bdev,b),
3391 bdevname(rdev0->bdev,b2));
3396 err = bind_rdev_to_array(rdev, mddev);
3403 * add_new_disk can be used once the array is assembled
3404 * to add "hot spares". They must already have a superblock
3409 if (!mddev->pers->hot_add_disk) {
3411 "%s: personality does not support diskops!\n",
3415 if (mddev->persistent)
3416 rdev = md_import_device(dev, mddev->major_version,
3417 mddev->minor_version);
3419 rdev = md_import_device(dev, -1, -1);
3422 "md: md_import_device returned %ld\n",
3424 return PTR_ERR(rdev);
3426 /* set save_raid_disk if appropriate */
3427 if (!mddev->persistent) {
3428 if (info->state & (1<<MD_DISK_SYNC) &&
3429 info->raid_disk < mddev->raid_disks)
3430 rdev->raid_disk = info->raid_disk;
3432 rdev->raid_disk = -1;
3434 super_types[mddev->major_version].
3435 validate_super(mddev, rdev);
3436 rdev->saved_raid_disk = rdev->raid_disk;
3438 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3439 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3440 set_bit(WriteMostly, &rdev->flags);
3442 rdev->raid_disk = -1;
3443 err = bind_rdev_to_array(rdev, mddev);
3444 if (!err && !mddev->pers->hot_remove_disk) {
3445 /* If there is hot_add_disk but no hot_remove_disk
3446 * then added disks for geometry changes,
3447 * and should be added immediately.
3449 super_types[mddev->major_version].
3450 validate_super(mddev, rdev);
3451 err = mddev->pers->hot_add_disk(mddev, rdev);
3453 unbind_rdev_from_array(rdev);
3458 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3459 md_wakeup_thread(mddev->thread);
3463 /* otherwise, add_new_disk is only allowed
3464 * for major_version==0 superblocks
3466 if (mddev->major_version != 0) {
3467 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3472 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3474 rdev = md_import_device (dev, -1, 0);
3477 "md: error, md_import_device() returned %ld\n",
3479 return PTR_ERR(rdev);
3481 rdev->desc_nr = info->number;
3482 if (info->raid_disk < mddev->raid_disks)
3483 rdev->raid_disk = info->raid_disk;
3485 rdev->raid_disk = -1;
3489 if (rdev->raid_disk < mddev->raid_disks)
3490 if (info->state & (1<<MD_DISK_SYNC))
3491 set_bit(In_sync, &rdev->flags);
3493 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3494 set_bit(WriteMostly, &rdev->flags);
3496 if (!mddev->persistent) {
3497 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3498 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3500 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3501 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3503 err = bind_rdev_to_array(rdev, mddev);
3513 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3515 char b[BDEVNAME_SIZE];
3521 rdev = find_rdev(mddev, dev);
3525 if (rdev->raid_disk >= 0)
3528 kick_rdev_from_array(rdev);
3529 md_update_sb(mddev);
3530 md_new_event(mddev);
3534 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3535 bdevname(rdev->bdev,b), mdname(mddev));
3539 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3541 char b[BDEVNAME_SIZE];
3549 if (mddev->major_version != 0) {
3550 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3551 " version-0 superblocks.\n",
3555 if (!mddev->pers->hot_add_disk) {
3557 "%s: personality does not support diskops!\n",
3562 rdev = md_import_device (dev, -1, 0);
3565 "md: error, md_import_device() returned %ld\n",
3570 if (mddev->persistent)
3571 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3574 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3576 size = calc_dev_size(rdev, mddev->chunk_size);
3579 if (test_bit(Faulty, &rdev->flags)) {
3581 "md: can not hot-add faulty %s disk to %s!\n",
3582 bdevname(rdev->bdev,b), mdname(mddev));
3586 clear_bit(In_sync, &rdev->flags);
3588 err = bind_rdev_to_array(rdev, mddev);
3593 * The rest should better be atomic, we can have disk failures
3594 * noticed in interrupt contexts ...
3597 if (rdev->desc_nr == mddev->max_disks) {
3598 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3601 goto abort_unbind_export;
3604 rdev->raid_disk = -1;
3606 md_update_sb(mddev);
3609 * Kick recovery, maybe this spare has to be added to the
3610 * array immediately.
3612 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3613 md_wakeup_thread(mddev->thread);
3614 md_new_event(mddev);
3617 abort_unbind_export:
3618 unbind_rdev_from_array(rdev);
3625 static int set_bitmap_file(mddev_t *mddev, int fd)
3630 if (!mddev->pers->quiesce)
3632 if (mddev->recovery || mddev->sync_thread)
3634 /* we should be able to change the bitmap.. */
3640 return -EEXIST; /* cannot add when bitmap is present */
3641 mddev->bitmap_file = fget(fd);
3643 if (mddev->bitmap_file == NULL) {
3644 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3649 err = deny_bitmap_write_access(mddev->bitmap_file);
3651 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3653 fput(mddev->bitmap_file);
3654 mddev->bitmap_file = NULL;
3657 mddev->bitmap_offset = 0; /* file overrides offset */
3658 } else if (mddev->bitmap == NULL)
3659 return -ENOENT; /* cannot remove what isn't there */
3662 mddev->pers->quiesce(mddev, 1);
3664 err = bitmap_create(mddev);
3665 if (fd < 0 || err) {
3666 bitmap_destroy(mddev);
3667 fd = -1; /* make sure to put the file */
3669 mddev->pers->quiesce(mddev, 0);
3672 if (mddev->bitmap_file) {
3673 restore_bitmap_write_access(mddev->bitmap_file);
3674 fput(mddev->bitmap_file);
3676 mddev->bitmap_file = NULL;
3683 * set_array_info is used two different ways
3684 * The original usage is when creating a new array.
3685 * In this usage, raid_disks is > 0 and it together with
3686 * level, size, not_persistent,layout,chunksize determine the
3687 * shape of the array.
3688 * This will always create an array with a type-0.90.0 superblock.
3689 * The newer usage is when assembling an array.
3690 * In this case raid_disks will be 0, and the major_version field is
3691 * use to determine which style super-blocks are to be found on the devices.
3692 * The minor and patch _version numbers are also kept incase the
3693 * super_block handler wishes to interpret them.
3695 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3698 if (info->raid_disks == 0) {
3699 /* just setting version number for superblock loading */
3700 if (info->major_version < 0 ||
3701 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3702 super_types[info->major_version].name == NULL) {
3703 /* maybe try to auto-load a module? */
3705 "md: superblock version %d not known\n",
3706 info->major_version);
3709 mddev->major_version = info->major_version;
3710 mddev->minor_version = info->minor_version;
3711 mddev->patch_version = info->patch_version;
3714 mddev->major_version = MD_MAJOR_VERSION;
3715 mddev->minor_version = MD_MINOR_VERSION;
3716 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3717 mddev->ctime = get_seconds();
3719 mddev->level = info->level;
3720 mddev->clevel[0] = 0;
3721 mddev->size = info->size;
3722 mddev->raid_disks = info->raid_disks;
3723 /* don't set md_minor, it is determined by which /dev/md* was
3726 if (info->state & (1<<MD_SB_CLEAN))
3727 mddev->recovery_cp = MaxSector;
3729 mddev->recovery_cp = 0;
3730 mddev->persistent = ! info->not_persistent;
3732 mddev->layout = info->layout;
3733 mddev->chunk_size = info->chunk_size;
3735 mddev->max_disks = MD_SB_DISKS;
3737 mddev->sb_dirty = 1;
3739 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3740 mddev->bitmap_offset = 0;
3742 mddev->reshape_position = MaxSector;
3745 * Generate a 128 bit UUID
3747 get_random_bytes(mddev->uuid, 16);
3749 mddev->new_level = mddev->level;
3750 mddev->new_chunk = mddev->chunk_size;
3751 mddev->new_layout = mddev->layout;
3752 mddev->delta_disks = 0;
3757 static int update_size(mddev_t *mddev, unsigned long size)
3761 struct list_head *tmp;
3762 int fit = (size == 0);
3764 if (mddev->pers->resize == NULL)
3766 /* The "size" is the amount of each device that is used.
3767 * This can only make sense for arrays with redundancy.
3768 * linear and raid0 always use whatever space is available
3769 * We can only consider changing the size if no resync
3770 * or reconstruction is happening, and if the new size
3771 * is acceptable. It must fit before the sb_offset or,
3772 * if that is <data_offset, it must fit before the
3773 * size of each device.
3774 * If size is zero, we find the largest size that fits.
3776 if (mddev->sync_thread)
3778 ITERATE_RDEV(mddev,rdev,tmp) {
3780 if (rdev->sb_offset > rdev->data_offset)
3781 avail = (rdev->sb_offset*2) - rdev->data_offset;
3783 avail = get_capacity(rdev->bdev->bd_disk)
3784 - rdev->data_offset;
3785 if (fit && (size == 0 || size > avail/2))
3787 if (avail < ((sector_t)size << 1))
3790 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3792 struct block_device *bdev;
3794 bdev = bdget_disk(mddev->gendisk, 0);
3796 mutex_lock(&bdev->bd_inode->i_mutex);
3797 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3798 mutex_unlock(&bdev->bd_inode->i_mutex);
3805 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3808 /* change the number of raid disks */
3809 if (mddev->pers->check_reshape == NULL)
3811 if (raid_disks <= 0 ||
3812 raid_disks >= mddev->max_disks)
3814 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
3816 mddev->delta_disks = raid_disks - mddev->raid_disks;
3818 rv = mddev->pers->check_reshape(mddev);
3824 * update_array_info is used to change the configuration of an
3826 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3827 * fields in the info are checked against the array.
3828 * Any differences that cannot be handled will cause an error.
3829 * Normally, only one change can be managed at a time.
3831 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3837 /* calculate expected state,ignoring low bits */
3838 if (mddev->bitmap && mddev->bitmap_offset)
3839 state |= (1 << MD_SB_BITMAP_PRESENT);
3841 if (mddev->major_version != info->major_version ||
3842 mddev->minor_version != info->minor_version ||
3843 /* mddev->patch_version != info->patch_version || */
3844 mddev->ctime != info->ctime ||
3845 mddev->level != info->level ||
3846 /* mddev->layout != info->layout || */
3847 !mddev->persistent != info->not_persistent||
3848 mddev->chunk_size != info->chunk_size ||
3849 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3850 ((state^info->state) & 0xfffffe00)
3853 /* Check there is only one change */
3854 if (info->size >= 0 && mddev->size != info->size) cnt++;
3855 if (mddev->raid_disks != info->raid_disks) cnt++;
3856 if (mddev->layout != info->layout) cnt++;
3857 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3858 if (cnt == 0) return 0;
3859 if (cnt > 1) return -EINVAL;
3861 if (mddev->layout != info->layout) {
3863 * we don't need to do anything at the md level, the
3864 * personality will take care of it all.
3866 if (mddev->pers->reconfig == NULL)
3869 return mddev->pers->reconfig(mddev, info->layout, -1);
3871 if (info->size >= 0 && mddev->size != info->size)
3872 rv = update_size(mddev, info->size);
3874 if (mddev->raid_disks != info->raid_disks)
3875 rv = update_raid_disks(mddev, info->raid_disks);
3877 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3878 if (mddev->pers->quiesce == NULL)
3880 if (mddev->recovery || mddev->sync_thread)
3882 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3883 /* add the bitmap */
3886 if (mddev->default_bitmap_offset == 0)
3888 mddev->bitmap_offset = mddev->default_bitmap_offset;
3889 mddev->pers->quiesce(mddev, 1);
3890 rv = bitmap_create(mddev);
3892 bitmap_destroy(mddev);
3893 mddev->pers->quiesce(mddev, 0);
3895 /* remove the bitmap */
3898 if (mddev->bitmap->file)
3900 mddev->pers->quiesce(mddev, 1);
3901 bitmap_destroy(mddev);
3902 mddev->pers->quiesce(mddev, 0);
3903 mddev->bitmap_offset = 0;
3906 md_update_sb(mddev);
3910 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3914 if (mddev->pers == NULL)
3917 rdev = find_rdev(mddev, dev);
3921 md_error(mddev, rdev);
3925 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3927 mddev_t *mddev = bdev->bd_disk->private_data;
3931 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3935 static int md_ioctl(struct inode *inode, struct file *file,
3936 unsigned int cmd, unsigned long arg)
3939 void __user *argp = (void __user *)arg;
3940 mddev_t *mddev = NULL;
3942 if (!capable(CAP_SYS_ADMIN))
3946 * Commands dealing with the RAID driver but not any
3952 err = get_version(argp);
3955 case PRINT_RAID_DEBUG:
3963 autostart_arrays(arg);
3970 * Commands creating/starting a new array:
3973 mddev = inode->i_bdev->bd_disk->private_data;
3981 if (cmd == START_ARRAY) {
3982 /* START_ARRAY doesn't need to lock the array as autostart_array
3983 * does the locking, and it could even be a different array
3988 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3989 "This will not be supported beyond July 2006\n",
3990 current->comm, current->pid);
3993 err = autostart_array(new_decode_dev(arg));
3995 printk(KERN_WARNING "md: autostart failed!\n");
4001 err = mddev_lock(mddev);
4004 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4011 case SET_ARRAY_INFO:
4013 mdu_array_info_t info;
4015 memset(&info, 0, sizeof(info));
4016 else if (copy_from_user(&info, argp, sizeof(info))) {
4021 err = update_array_info(mddev, &info);
4023 printk(KERN_WARNING "md: couldn't update"
4024 " array info. %d\n", err);
4029 if (!list_empty(&mddev->disks)) {
4031 "md: array %s already has disks!\n",
4036 if (mddev->raid_disks) {
4038 "md: array %s already initialised!\n",
4043 err = set_array_info(mddev, &info);
4045 printk(KERN_WARNING "md: couldn't set"
4046 " array info. %d\n", err);
4056 * Commands querying/configuring an existing array:
4058 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4059 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4060 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4061 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
4067 * Commands even a read-only array can execute:
4071 case GET_ARRAY_INFO:
4072 err = get_array_info(mddev, argp);
4075 case GET_BITMAP_FILE:
4076 err = get_bitmap_file(mddev, argp);
4080 err = get_disk_info(mddev, argp);
4083 case RESTART_ARRAY_RW:
4084 err = restart_array(mddev);
4088 err = do_md_stop (mddev, 0);
4092 err = do_md_stop (mddev, 1);
4096 * We have a problem here : there is no easy way to give a CHS
4097 * virtual geometry. We currently pretend that we have a 2 heads
4098 * 4 sectors (with a BIG number of cylinders...). This drives
4099 * dosfs just mad... ;-)
4104 * The remaining ioctls are changing the state of the
4105 * superblock, so we do not allow them on read-only arrays.
4106 * However non-MD ioctls (e.g. get-size) will still come through
4107 * here and hit the 'default' below, so only disallow
4108 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4110 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4111 mddev->ro && mddev->pers) {
4112 if (mddev->ro == 2) {
4114 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4115 md_wakeup_thread(mddev->thread);
4127 mdu_disk_info_t info;
4128 if (copy_from_user(&info, argp, sizeof(info)))
4131 err = add_new_disk(mddev, &info);
4135 case HOT_REMOVE_DISK:
4136 err = hot_remove_disk(mddev, new_decode_dev(arg));
4140 err = hot_add_disk(mddev, new_decode_dev(arg));
4143 case SET_DISK_FAULTY:
4144 err = set_disk_faulty(mddev, new_decode_dev(arg));
4148 err = do_md_run (mddev);
4151 case SET_BITMAP_FILE:
4152 err = set_bitmap_file(mddev, (int)arg);
4162 mddev_unlock(mddev);
4172 static int md_open(struct inode *inode, struct file *file)
4175 * Succeed if we can lock the mddev, which confirms that
4176 * it isn't being stopped right now.
4178 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4181 if ((err = mddev_lock(mddev)))
4186 mddev_unlock(mddev);
4188 check_disk_change(inode->i_bdev);
4193 static int md_release(struct inode *inode, struct file * file)
4195 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4204 static int md_media_changed(struct gendisk *disk)
4206 mddev_t *mddev = disk->private_data;
4208 return mddev->changed;
4211 static int md_revalidate(struct gendisk *disk)
4213 mddev_t *mddev = disk->private_data;
4218 static struct block_device_operations md_fops =
4220 .owner = THIS_MODULE,
4222 .release = md_release,
4224 .getgeo = md_getgeo,
4225 .media_changed = md_media_changed,
4226 .revalidate_disk= md_revalidate,
4229 static int md_thread(void * arg)
4231 mdk_thread_t *thread = arg;
4234 * md_thread is a 'system-thread', it's priority should be very
4235 * high. We avoid resource deadlocks individually in each
4236 * raid personality. (RAID5 does preallocation) We also use RR and
4237 * the very same RT priority as kswapd, thus we will never get
4238 * into a priority inversion deadlock.
4240 * we definitely have to have equal or higher priority than
4241 * bdflush, otherwise bdflush will deadlock if there are too
4242 * many dirty RAID5 blocks.
4245 allow_signal(SIGKILL);
4246 while (!kthread_should_stop()) {
4248 /* We need to wait INTERRUPTIBLE so that
4249 * we don't add to the load-average.
4250 * That means we need to be sure no signals are
4253 if (signal_pending(current))
4254 flush_signals(current);
4256 wait_event_interruptible_timeout
4258 test_bit(THREAD_WAKEUP, &thread->flags)
4259 || kthread_should_stop(),
4263 clear_bit(THREAD_WAKEUP, &thread->flags);
4265 thread->run(thread->mddev);
4271 void md_wakeup_thread(mdk_thread_t *thread)
4274 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4275 set_bit(THREAD_WAKEUP, &thread->flags);
4276 wake_up(&thread->wqueue);
4280 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4283 mdk_thread_t *thread;
4285 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4289 init_waitqueue_head(&thread->wqueue);
4292 thread->mddev = mddev;
4293 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4294 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4295 if (IS_ERR(thread->tsk)) {
4302 void md_unregister_thread(mdk_thread_t *thread)
4304 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
4306 kthread_stop(thread->tsk);
4310 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4317 if (!rdev || test_bit(Faulty, &rdev->flags))
4320 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4322 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4323 __builtin_return_address(0),__builtin_return_address(1),
4324 __builtin_return_address(2),__builtin_return_address(3));
4326 if (!mddev->pers->error_handler)
4328 mddev->pers->error_handler(mddev,rdev);
4329 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4330 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4331 md_wakeup_thread(mddev->thread);
4332 md_new_event_inintr(mddev);
4335 /* seq_file implementation /proc/mdstat */
4337 static void status_unused(struct seq_file *seq)
4341 struct list_head *tmp;
4343 seq_printf(seq, "unused devices: ");
4345 ITERATE_RDEV_PENDING(rdev,tmp) {
4346 char b[BDEVNAME_SIZE];
4348 seq_printf(seq, "%s ",
4349 bdevname(rdev->bdev,b));
4352 seq_printf(seq, "<none>");
4354 seq_printf(seq, "\n");
4358 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4360 sector_t max_blocks, resync, res;
4361 unsigned long dt, db, rt;
4363 unsigned int per_milli;
4365 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4367 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4368 max_blocks = mddev->resync_max_sectors >> 1;
4370 max_blocks = mddev->size;
4373 * Should not happen.
4379 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4380 * in a sector_t, and (max_blocks>>scale) will fit in a
4381 * u32, as those are the requirements for sector_div.
4382 * Thus 'scale' must be at least 10
4385 if (sizeof(sector_t) > sizeof(unsigned long)) {
4386 while ( max_blocks/2 > (1ULL<<(scale+32)))
4389 res = (resync>>scale)*1000;
4390 sector_div(res, (u32)((max_blocks>>scale)+1));
4394 int i, x = per_milli/50, y = 20-x;
4395 seq_printf(seq, "[");
4396 for (i = 0; i < x; i++)
4397 seq_printf(seq, "=");
4398 seq_printf(seq, ">");
4399 for (i = 0; i < y; i++)
4400 seq_printf(seq, ".");
4401 seq_printf(seq, "] ");
4403 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4404 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4406 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4407 "resync" : "recovery")),
4408 per_milli/10, per_milli % 10,
4409 (unsigned long long) resync,
4410 (unsigned long long) max_blocks);
4413 * We do not want to overflow, so the order of operands and
4414 * the * 100 / 100 trick are important. We do a +1 to be
4415 * safe against division by zero. We only estimate anyway.
4417 * dt: time from mark until now
4418 * db: blocks written from mark until now
4419 * rt: remaining time
4421 dt = ((jiffies - mddev->resync_mark) / HZ);
4423 db = resync - (mddev->resync_mark_cnt/2);
4424 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
4426 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4428 seq_printf(seq, " speed=%ldK/sec", db/dt);
4431 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4433 struct list_head *tmp;
4443 spin_lock(&all_mddevs_lock);
4444 list_for_each(tmp,&all_mddevs)
4446 mddev = list_entry(tmp, mddev_t, all_mddevs);
4448 spin_unlock(&all_mddevs_lock);
4451 spin_unlock(&all_mddevs_lock);
4453 return (void*)2;/* tail */
4457 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4459 struct list_head *tmp;
4460 mddev_t *next_mddev, *mddev = v;
4466 spin_lock(&all_mddevs_lock);
4468 tmp = all_mddevs.next;
4470 tmp = mddev->all_mddevs.next;
4471 if (tmp != &all_mddevs)
4472 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4474 next_mddev = (void*)2;
4477 spin_unlock(&all_mddevs_lock);
4485 static void md_seq_stop(struct seq_file *seq, void *v)
4489 if (mddev && v != (void*)1 && v != (void*)2)
4493 struct mdstat_info {
4497 static int md_seq_show(struct seq_file *seq, void *v)
4501 struct list_head *tmp2;
4503 struct mdstat_info *mi = seq->private;
4504 struct bitmap *bitmap;
4506 if (v == (void*)1) {
4507 struct mdk_personality *pers;
4508 seq_printf(seq, "Personalities : ");
4509 spin_lock(&pers_lock);
4510 list_for_each_entry(pers, &pers_list, list)
4511 seq_printf(seq, "[%s] ", pers->name);
4513 spin_unlock(&pers_lock);
4514 seq_printf(seq, "\n");
4515 mi->event = atomic_read(&md_event_count);
4518 if (v == (void*)2) {
4523 if (mddev_lock(mddev) < 0)
4526 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4527 seq_printf(seq, "%s : %sactive", mdname(mddev),
4528 mddev->pers ? "" : "in");
4531 seq_printf(seq, " (read-only)");
4533 seq_printf(seq, "(auto-read-only)");
4534 seq_printf(seq, " %s", mddev->pers->name);
4538 ITERATE_RDEV(mddev,rdev,tmp2) {
4539 char b[BDEVNAME_SIZE];
4540 seq_printf(seq, " %s[%d]",
4541 bdevname(rdev->bdev,b), rdev->desc_nr);
4542 if (test_bit(WriteMostly, &rdev->flags))
4543 seq_printf(seq, "(W)");
4544 if (test_bit(Faulty, &rdev->flags)) {
4545 seq_printf(seq, "(F)");
4547 } else if (rdev->raid_disk < 0)
4548 seq_printf(seq, "(S)"); /* spare */
4552 if (!list_empty(&mddev->disks)) {
4554 seq_printf(seq, "\n %llu blocks",
4555 (unsigned long long)mddev->array_size);
4557 seq_printf(seq, "\n %llu blocks",
4558 (unsigned long long)size);
4560 if (mddev->persistent) {
4561 if (mddev->major_version != 0 ||
4562 mddev->minor_version != 90) {
4563 seq_printf(seq," super %d.%d",
4564 mddev->major_version,
4565 mddev->minor_version);
4568 seq_printf(seq, " super non-persistent");
4571 mddev->pers->status (seq, mddev);
4572 seq_printf(seq, "\n ");
4573 if (mddev->pers->sync_request) {
4574 if (mddev->curr_resync > 2) {
4575 status_resync (seq, mddev);
4576 seq_printf(seq, "\n ");
4577 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4578 seq_printf(seq, "\tresync=DELAYED\n ");
4579 else if (mddev->recovery_cp < MaxSector)
4580 seq_printf(seq, "\tresync=PENDING\n ");
4583 seq_printf(seq, "\n ");
4585 if ((bitmap = mddev->bitmap)) {
4586 unsigned long chunk_kb;
4587 unsigned long flags;
4588 spin_lock_irqsave(&bitmap->lock, flags);
4589 chunk_kb = bitmap->chunksize >> 10;
4590 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4592 bitmap->pages - bitmap->missing_pages,
4594 (bitmap->pages - bitmap->missing_pages)
4595 << (PAGE_SHIFT - 10),
4596 chunk_kb ? chunk_kb : bitmap->chunksize,
4597 chunk_kb ? "KB" : "B");
4599 seq_printf(seq, ", file: ");
4600 seq_path(seq, bitmap->file->f_vfsmnt,
4601 bitmap->file->f_dentry," \t\n");
4604 seq_printf(seq, "\n");
4605 spin_unlock_irqrestore(&bitmap->lock, flags);
4608 seq_printf(seq, "\n");
4610 mddev_unlock(mddev);
4615 static struct seq_operations md_seq_ops = {
4616 .start = md_seq_start,
4617 .next = md_seq_next,
4618 .stop = md_seq_stop,
4619 .show = md_seq_show,
4622 static int md_seq_open(struct inode *inode, struct file *file)
4625 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4629 error = seq_open(file, &md_seq_ops);
4633 struct seq_file *p = file->private_data;
4635 mi->event = atomic_read(&md_event_count);
4640 static int md_seq_release(struct inode *inode, struct file *file)
4642 struct seq_file *m = file->private_data;
4643 struct mdstat_info *mi = m->private;
4646 return seq_release(inode, file);
4649 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4651 struct seq_file *m = filp->private_data;
4652 struct mdstat_info *mi = m->private;
4655 poll_wait(filp, &md_event_waiters, wait);
4657 /* always allow read */
4658 mask = POLLIN | POLLRDNORM;
4660 if (mi->event != atomic_read(&md_event_count))
4661 mask |= POLLERR | POLLPRI;
4665 static struct file_operations md_seq_fops = {
4666 .open = md_seq_open,
4668 .llseek = seq_lseek,
4669 .release = md_seq_release,
4670 .poll = mdstat_poll,
4673 int register_md_personality(struct mdk_personality *p)
4675 spin_lock(&pers_lock);
4676 list_add_tail(&p->list, &pers_list);
4677 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4678 spin_unlock(&pers_lock);
4682 int unregister_md_personality(struct mdk_personality *p)
4684 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4685 spin_lock(&pers_lock);
4686 list_del_init(&p->list);
4687 spin_unlock(&pers_lock);
4691 static int is_mddev_idle(mddev_t *mddev)
4694 struct list_head *tmp;
4696 unsigned long curr_events;
4699 ITERATE_RDEV(mddev,rdev,tmp) {
4700 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4701 curr_events = disk_stat_read(disk, sectors[0]) +
4702 disk_stat_read(disk, sectors[1]) -
4703 atomic_read(&disk->sync_io);
4704 /* The difference between curr_events and last_events
4705 * will be affected by any new non-sync IO (making
4706 * curr_events bigger) and any difference in the amount of
4707 * in-flight syncio (making current_events bigger or smaller)
4708 * The amount in-flight is currently limited to
4709 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4710 * which is at most 4096 sectors.
4711 * These numbers are fairly fragile and should be made
4712 * more robust, probably by enforcing the
4713 * 'window size' that md_do_sync sort-of uses.
4715 * Note: the following is an unsigned comparison.
4717 if ((curr_events - rdev->last_events + 4096) > 8192) {
4718 rdev->last_events = curr_events;
4725 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4727 /* another "blocks" (512byte) blocks have been synced */
4728 atomic_sub(blocks, &mddev->recovery_active);
4729 wake_up(&mddev->recovery_wait);
4731 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4732 md_wakeup_thread(mddev->thread);
4733 // stop recovery, signal do_sync ....
4738 /* md_write_start(mddev, bi)
4739 * If we need to update some array metadata (e.g. 'active' flag
4740 * in superblock) before writing, schedule a superblock update
4741 * and wait for it to complete.
4743 void md_write_start(mddev_t *mddev, struct bio *bi)
4745 if (bio_data_dir(bi) != WRITE)
4748 BUG_ON(mddev->ro == 1);
4749 if (mddev->ro == 2) {
4750 /* need to switch to read/write */
4752 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4753 md_wakeup_thread(mddev->thread);
4755 atomic_inc(&mddev->writes_pending);
4756 if (mddev->in_sync) {
4757 spin_lock_irq(&mddev->write_lock);
4758 if (mddev->in_sync) {
4760 mddev->sb_dirty = 3;
4761 md_wakeup_thread(mddev->thread);
4763 spin_unlock_irq(&mddev->write_lock);
4765 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4768 void md_write_end(mddev_t *mddev)
4770 if (atomic_dec_and_test(&mddev->writes_pending)) {
4771 if (mddev->safemode == 2)
4772 md_wakeup_thread(mddev->thread);
4773 else if (mddev->safemode_delay)
4774 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4778 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4780 #define SYNC_MARKS 10
4781 #define SYNC_MARK_STEP (3*HZ)
4782 void md_do_sync(mddev_t *mddev)
4785 unsigned int currspeed = 0,
4787 sector_t max_sectors,j, io_sectors;
4788 unsigned long mark[SYNC_MARKS];
4789 sector_t mark_cnt[SYNC_MARKS];
4791 struct list_head *tmp;
4792 sector_t last_check;
4794 struct list_head *rtmp;
4797 /* just incase thread restarts... */
4798 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4800 if (mddev->ro) /* never try to sync a read-only array */
4803 /* we overload curr_resync somewhat here.
4804 * 0 == not engaged in resync at all
4805 * 2 == checking that there is no conflict with another sync
4806 * 1 == like 2, but have yielded to allow conflicting resync to
4808 * other == active in resync - this many blocks
4810 * Before starting a resync we must have set curr_resync to
4811 * 2, and then checked that every "conflicting" array has curr_resync
4812 * less than ours. When we find one that is the same or higher
4813 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4814 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4815 * This will mean we have to start checking from the beginning again.
4820 mddev->curr_resync = 2;
4823 if (kthread_should_stop()) {
4824 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4827 ITERATE_MDDEV(mddev2,tmp) {
4828 if (mddev2 == mddev)
4830 if (mddev2->curr_resync &&
4831 match_mddev_units(mddev,mddev2)) {
4833 if (mddev < mddev2 && mddev->curr_resync == 2) {
4834 /* arbitrarily yield */
4835 mddev->curr_resync = 1;
4836 wake_up(&resync_wait);
4838 if (mddev > mddev2 && mddev->curr_resync == 1)
4839 /* no need to wait here, we can wait the next
4840 * time 'round when curr_resync == 2
4843 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4844 if (!kthread_should_stop() &&
4845 mddev2->curr_resync >= mddev->curr_resync) {
4846 printk(KERN_INFO "md: delaying resync of %s"
4847 " until %s has finished resync (they"
4848 " share one or more physical units)\n",
4849 mdname(mddev), mdname(mddev2));
4852 finish_wait(&resync_wait, &wq);
4855 finish_wait(&resync_wait, &wq);
4858 } while (mddev->curr_resync < 2);
4861 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4862 /* resync follows the size requested by the personality,
4863 * which defaults to physical size, but can be virtual size
4865 max_sectors = mddev->resync_max_sectors;
4866 mddev->resync_mismatches = 0;
4867 /* we don't use the checkpoint if there's a bitmap */
4868 if (!mddev->bitmap &&
4869 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4870 j = mddev->recovery_cp;
4871 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4872 max_sectors = mddev->size << 1;
4874 /* recovery follows the physical size of devices */
4875 max_sectors = mddev->size << 1;
4877 ITERATE_RDEV(mddev,rdev,rtmp)
4878 if (rdev->raid_disk >= 0 &&
4879 !test_bit(Faulty, &rdev->flags) &&
4880 !test_bit(In_sync, &rdev->flags) &&
4881 rdev->recovery_offset < j)
4882 j = rdev->recovery_offset;
4885 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4886 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4887 " %d KB/sec/disc.\n", speed_min(mddev));
4888 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4889 "(but not more than %d KB/sec) for reconstruction.\n",
4892 is_mddev_idle(mddev); /* this also initializes IO event counters */
4895 for (m = 0; m < SYNC_MARKS; m++) {
4897 mark_cnt[m] = io_sectors;
4900 mddev->resync_mark = mark[last_mark];
4901 mddev->resync_mark_cnt = mark_cnt[last_mark];
4904 * Tune reconstruction:
4906 window = 32*(PAGE_SIZE/512);
4907 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4908 window/2,(unsigned long long) max_sectors/2);
4910 atomic_set(&mddev->recovery_active, 0);
4911 init_waitqueue_head(&mddev->recovery_wait);
4916 "md: resuming recovery of %s from checkpoint.\n",
4918 mddev->curr_resync = j;
4921 while (j < max_sectors) {
4925 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4926 currspeed < speed_min(mddev));
4928 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4932 if (!skipped) { /* actual IO requested */
4933 io_sectors += sectors;
4934 atomic_add(sectors, &mddev->recovery_active);
4938 if (j>1) mddev->curr_resync = j;
4939 if (last_check == 0)
4940 /* this is the earliers that rebuilt will be
4941 * visible in /proc/mdstat
4943 md_new_event(mddev);
4945 if (last_check + window > io_sectors || j == max_sectors)
4948 last_check = io_sectors;
4950 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4951 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4955 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4957 int next = (last_mark+1) % SYNC_MARKS;
4959 mddev->resync_mark = mark[next];
4960 mddev->resync_mark_cnt = mark_cnt[next];
4961 mark[next] = jiffies;
4962 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4967 if (kthread_should_stop()) {
4969 * got a signal, exit.
4972 "md: md_do_sync() got signal ... exiting\n");
4973 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4978 * this loop exits only if either when we are slower than
4979 * the 'hard' speed limit, or the system was IO-idle for
4981 * the system might be non-idle CPU-wise, but we only care
4982 * about not overloading the IO subsystem. (things like an
4983 * e2fsck being done on the RAID array should execute fast)
4985 mddev->queue->unplug_fn(mddev->queue);
4988 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4989 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4991 if (currspeed > speed_min(mddev)) {
4992 if ((currspeed > speed_max(mddev)) ||
4993 !is_mddev_idle(mddev)) {
4999 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
5001 * this also signals 'finished resyncing' to md_stop
5004 mddev->queue->unplug_fn(mddev->queue);
5006 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5008 /* tell personality that we are finished */
5009 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5011 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5012 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
5013 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5014 mddev->curr_resync > 2) {
5015 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5016 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5017 if (mddev->curr_resync >= mddev->recovery_cp) {
5019 "md: checkpointing recovery of %s.\n",
5021 mddev->recovery_cp = mddev->curr_resync;
5024 mddev->recovery_cp = MaxSector;
5026 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5027 mddev->curr_resync = MaxSector;
5028 ITERATE_RDEV(mddev,rdev,rtmp)
5029 if (rdev->raid_disk >= 0 &&
5030 !test_bit(Faulty, &rdev->flags) &&
5031 !test_bit(In_sync, &rdev->flags) &&
5032 rdev->recovery_offset < mddev->curr_resync)
5033 rdev->recovery_offset = mddev->curr_resync;
5034 mddev->sb_dirty = 1;
5039 mddev->curr_resync = 0;
5040 wake_up(&resync_wait);
5041 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5042 md_wakeup_thread(mddev->thread);
5044 EXPORT_SYMBOL_GPL(md_do_sync);
5048 * This routine is regularly called by all per-raid-array threads to
5049 * deal with generic issues like resync and super-block update.
5050 * Raid personalities that don't have a thread (linear/raid0) do not
5051 * need this as they never do any recovery or update the superblock.
5053 * It does not do any resync itself, but rather "forks" off other threads
5054 * to do that as needed.
5055 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5056 * "->recovery" and create a thread at ->sync_thread.
5057 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5058 * and wakeups up this thread which will reap the thread and finish up.
5059 * This thread also removes any faulty devices (with nr_pending == 0).
5061 * The overall approach is:
5062 * 1/ if the superblock needs updating, update it.
5063 * 2/ If a recovery thread is running, don't do anything else.
5064 * 3/ If recovery has finished, clean up, possibly marking spares active.
5065 * 4/ If there are any faulty devices, remove them.
5066 * 5/ If array is degraded, try to add spares devices
5067 * 6/ If array has spares or is not in-sync, start a resync thread.
5069 void md_check_recovery(mddev_t *mddev)
5072 struct list_head *rtmp;
5076 bitmap_daemon_work(mddev->bitmap);
5081 if (signal_pending(current)) {
5082 if (mddev->pers->sync_request) {
5083 printk(KERN_INFO "md: %s in immediate safe mode\n",
5085 mddev->safemode = 2;
5087 flush_signals(current);
5092 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5093 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5094 (mddev->safemode == 1) ||
5095 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5096 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5100 if (mddev_trylock(mddev)) {
5103 spin_lock_irq(&mddev->write_lock);
5104 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5105 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5107 mddev->sb_dirty = 3;
5109 if (mddev->safemode == 1)
5110 mddev->safemode = 0;
5111 spin_unlock_irq(&mddev->write_lock);
5113 if (mddev->sb_dirty)
5114 md_update_sb(mddev);
5117 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5118 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5119 /* resync/recovery still happening */
5120 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5123 if (mddev->sync_thread) {
5124 /* resync has finished, collect result */
5125 md_unregister_thread(mddev->sync_thread);
5126 mddev->sync_thread = NULL;
5127 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5128 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5130 /* activate any spares */
5131 mddev->pers->spare_active(mddev);
5133 md_update_sb(mddev);
5135 /* if array is no-longer degraded, then any saved_raid_disk
5136 * information must be scrapped
5138 if (!mddev->degraded)
5139 ITERATE_RDEV(mddev,rdev,rtmp)
5140 rdev->saved_raid_disk = -1;
5142 mddev->recovery = 0;
5143 /* flag recovery needed just to double check */
5144 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5145 md_new_event(mddev);
5148 /* Clear some bits that don't mean anything, but
5151 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5152 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5153 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5154 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5156 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5158 /* no recovery is running.
5159 * remove any failed drives, then
5160 * add spares if possible.
5161 * Spare are also removed and re-added, to allow
5162 * the personality to fail the re-add.
5164 ITERATE_RDEV(mddev,rdev,rtmp)
5165 if (rdev->raid_disk >= 0 &&
5166 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
5167 atomic_read(&rdev->nr_pending)==0) {
5168 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5170 sprintf(nm,"rd%d", rdev->raid_disk);
5171 sysfs_remove_link(&mddev->kobj, nm);
5172 rdev->raid_disk = -1;
5176 if (mddev->degraded) {
5177 ITERATE_RDEV(mddev,rdev,rtmp)
5178 if (rdev->raid_disk < 0
5179 && !test_bit(Faulty, &rdev->flags)) {
5180 rdev->recovery_offset = 0;
5181 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5183 sprintf(nm, "rd%d", rdev->raid_disk);
5184 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
5186 md_new_event(mddev);
5193 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5194 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5195 } else if (mddev->recovery_cp < MaxSector) {
5196 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5197 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5198 /* nothing to be done ... */
5201 if (mddev->pers->sync_request) {
5202 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5203 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5204 /* We are adding a device or devices to an array
5205 * which has the bitmap stored on all devices.
5206 * So make sure all bitmap pages get written
5208 bitmap_write_all(mddev->bitmap);
5210 mddev->sync_thread = md_register_thread(md_do_sync,
5213 if (!mddev->sync_thread) {
5214 printk(KERN_ERR "%s: could not start resync"
5217 /* leave the spares where they are, it shouldn't hurt */
5218 mddev->recovery = 0;
5220 md_wakeup_thread(mddev->sync_thread);
5221 md_new_event(mddev);
5224 mddev_unlock(mddev);
5228 static int md_notify_reboot(struct notifier_block *this,
5229 unsigned long code, void *x)
5231 struct list_head *tmp;
5234 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5236 printk(KERN_INFO "md: stopping all md devices.\n");
5238 ITERATE_MDDEV(mddev,tmp)
5239 if (mddev_trylock(mddev)) {
5240 do_md_stop (mddev, 1);
5241 mddev_unlock(mddev);
5244 * certain more exotic SCSI devices are known to be
5245 * volatile wrt too early system reboots. While the
5246 * right place to handle this issue is the given
5247 * driver, we do want to have a safe RAID driver ...
5254 static struct notifier_block md_notifier = {
5255 .notifier_call = md_notify_reboot,
5257 .priority = INT_MAX, /* before any real devices */
5260 static void md_geninit(void)
5262 struct proc_dir_entry *p;
5264 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5266 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5268 p->proc_fops = &md_seq_fops;
5271 static int __init md_init(void)
5275 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5276 " MD_SB_DISKS=%d\n",
5277 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5278 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
5279 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
5282 if (register_blkdev(MAJOR_NR, "md"))
5284 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5285 unregister_blkdev(MAJOR_NR, "md");
5289 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5290 md_probe, NULL, NULL);
5291 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5292 md_probe, NULL, NULL);
5294 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5295 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
5296 S_IFBLK|S_IRUSR|S_IWUSR,
5299 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5300 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
5301 S_IFBLK|S_IRUSR|S_IWUSR,
5305 register_reboot_notifier(&md_notifier);
5306 raid_table_header = register_sysctl_table(raid_root_table, 1);
5316 * Searches all registered partitions for autorun RAID arrays
5319 static dev_t detected_devices[128];
5322 void md_autodetect_dev(dev_t dev)
5324 if (dev_cnt >= 0 && dev_cnt < 127)
5325 detected_devices[dev_cnt++] = dev;
5329 static void autostart_arrays(int part)
5334 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5336 for (i = 0; i < dev_cnt; i++) {
5337 dev_t dev = detected_devices[i];
5339 rdev = md_import_device(dev,0, 0);
5343 if (test_bit(Faulty, &rdev->flags)) {
5347 list_add(&rdev->same_set, &pending_raid_disks);
5351 autorun_devices(part);
5356 static __exit void md_exit(void)
5359 struct list_head *tmp;
5361 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5362 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5363 for (i=0; i < MAX_MD_DEVS; i++)
5364 devfs_remove("md/%d", i);
5365 for (i=0; i < MAX_MD_DEVS; i++)
5366 devfs_remove("md/d%d", i);
5370 unregister_blkdev(MAJOR_NR,"md");
5371 unregister_blkdev(mdp_major, "mdp");
5372 unregister_reboot_notifier(&md_notifier);
5373 unregister_sysctl_table(raid_table_header);
5374 remove_proc_entry("mdstat", NULL);
5375 ITERATE_MDDEV(mddev,tmp) {
5376 struct gendisk *disk = mddev->gendisk;
5379 export_array(mddev);
5382 mddev->gendisk = NULL;
5387 module_init(md_init)
5388 module_exit(md_exit)
5390 static int get_ro(char *buffer, struct kernel_param *kp)
5392 return sprintf(buffer, "%d", start_readonly);
5394 static int set_ro(const char *val, struct kernel_param *kp)
5397 int num = simple_strtoul(val, &e, 10);
5398 if (*val && (*e == '\0' || *e == '\n')) {
5399 start_readonly = num;
5405 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5406 module_param(start_dirty_degraded, int, 0644);
5409 EXPORT_SYMBOL(register_md_personality);
5410 EXPORT_SYMBOL(unregister_md_personality);
5411 EXPORT_SYMBOL(md_error);
5412 EXPORT_SYMBOL(md_done_sync);
5413 EXPORT_SYMBOL(md_write_start);
5414 EXPORT_SYMBOL(md_write_end);
5415 EXPORT_SYMBOL(md_register_thread);
5416 EXPORT_SYMBOL(md_unregister_thread);
5417 EXPORT_SYMBOL(md_wakeup_thread);
5418 EXPORT_SYMBOL(md_check_recovery);
5419 MODULE_LICENSE("GPL");
5421 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);