2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/raid/md.h>
37 #include <linux/sysctl.h>
38 #include <linux/buffer_head.h> /* for invalidate_bdev */
39 #include <linux/poll.h>
40 #include <linux/ctype.h>
41 #include <linux/hdreg.h>
42 #include <linux/proc_fs.h>
43 #include <linux/random.h>
44 #include <linux/reboot.h>
45 #include <linux/file.h>
46 #include <linux/delay.h>
50 #define dprintk(x...) ((void)(DEBUG && printk(x)))
54 static void autostart_arrays(int part);
57 static LIST_HEAD(pers_list);
58 static DEFINE_SPINLOCK(pers_lock);
60 static void md_print_devices(void);
62 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
64 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
67 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
68 * is 1000 KB/sec, so the extra system load does not show up that much.
69 * Increase it if you want to have more _guaranteed_ speed. Note that
70 * the RAID driver will use the maximum available bandwidth if the IO
71 * subsystem is idle. There is also an 'absolute maximum' reconstruction
72 * speed limit - in case reconstruction slows down your system despite
75 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
76 * or /sys/block/mdX/md/sync_speed_{min,max}
79 static int sysctl_speed_limit_min = 1000;
80 static int sysctl_speed_limit_max = 200000;
81 static inline int speed_min(mddev_t *mddev)
83 return mddev->sync_speed_min ?
84 mddev->sync_speed_min : sysctl_speed_limit_min;
87 static inline int speed_max(mddev_t *mddev)
89 return mddev->sync_speed_max ?
90 mddev->sync_speed_max : sysctl_speed_limit_max;
93 static struct ctl_table_header *raid_table_header;
95 static ctl_table raid_table[] = {
97 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
98 .procname = "speed_limit_min",
99 .data = &sysctl_speed_limit_min,
100 .maxlen = sizeof(int),
101 .mode = S_IRUGO|S_IWUSR,
102 .proc_handler = &proc_dointvec,
105 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
106 .procname = "speed_limit_max",
107 .data = &sysctl_speed_limit_max,
108 .maxlen = sizeof(int),
109 .mode = S_IRUGO|S_IWUSR,
110 .proc_handler = &proc_dointvec,
115 static ctl_table raid_dir_table[] = {
117 .ctl_name = DEV_RAID,
120 .mode = S_IRUGO|S_IXUGO,
126 static ctl_table raid_root_table[] = {
132 .child = raid_dir_table,
137 static struct block_device_operations md_fops;
139 static int start_readonly;
142 * We have a system wide 'event count' that is incremented
143 * on any 'interesting' event, and readers of /proc/mdstat
144 * can use 'poll' or 'select' to find out when the event
148 * start array, stop array, error, add device, remove device,
149 * start build, activate spare
151 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
152 static atomic_t md_event_count;
153 void md_new_event(mddev_t *mddev)
155 atomic_inc(&md_event_count);
156 wake_up(&md_event_waiters);
158 EXPORT_SYMBOL_GPL(md_new_event);
160 /* Alternate version that can be called from interrupts
161 * when calling sysfs_notify isn't needed.
163 static void md_new_event_inintr(mddev_t *mddev)
165 atomic_inc(&md_event_count);
166 wake_up(&md_event_waiters);
170 * Enables to iterate over all existing md arrays
171 * all_mddevs_lock protects this list.
173 static LIST_HEAD(all_mddevs);
174 static DEFINE_SPINLOCK(all_mddevs_lock);
178 * iterates through all used mddevs in the system.
179 * We take care to grab the all_mddevs_lock whenever navigating
180 * the list, and to always hold a refcount when unlocked.
181 * Any code which breaks out of this loop while own
182 * a reference to the current mddev and must mddev_put it.
184 #define for_each_mddev(mddev,tmp) \
186 for (({ spin_lock(&all_mddevs_lock); \
187 tmp = all_mddevs.next; \
189 ({ if (tmp != &all_mddevs) \
190 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
191 spin_unlock(&all_mddevs_lock); \
192 if (mddev) mddev_put(mddev); \
193 mddev = list_entry(tmp, mddev_t, all_mddevs); \
194 tmp != &all_mddevs;}); \
195 ({ spin_lock(&all_mddevs_lock); \
200 static int md_fail_request(struct request_queue *q, struct bio *bio)
206 static inline mddev_t *mddev_get(mddev_t *mddev)
208 atomic_inc(&mddev->active);
212 static void mddev_delayed_delete(struct work_struct *ws)
214 mddev_t *mddev = container_of(ws, mddev_t, del_work);
215 kobject_del(&mddev->kobj);
216 kobject_put(&mddev->kobj);
219 static void mddev_put(mddev_t *mddev)
221 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
223 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
224 !mddev->hold_active) {
225 list_del(&mddev->all_mddevs);
226 if (mddev->gendisk) {
227 /* we did a probe so need to clean up.
228 * Call schedule_work inside the spinlock
229 * so that flush_scheduled_work() after
230 * mddev_find will succeed in waiting for the
233 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
234 schedule_work(&mddev->del_work);
238 spin_unlock(&all_mddevs_lock);
241 static mddev_t * mddev_find(dev_t unit)
243 mddev_t *mddev, *new = NULL;
246 spin_lock(&all_mddevs_lock);
249 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
250 if (mddev->unit == unit) {
252 spin_unlock(&all_mddevs_lock);
258 list_add(&new->all_mddevs, &all_mddevs);
259 spin_unlock(&all_mddevs_lock);
260 new->hold_active = UNTIL_IOCTL;
264 /* find an unused unit number */
265 static int next_minor = 512;
266 int start = next_minor;
270 dev = MKDEV(MD_MAJOR, next_minor);
272 if (next_minor > MINORMASK)
274 if (next_minor == start) {
275 /* Oh dear, all in use. */
276 spin_unlock(&all_mddevs_lock);
282 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
283 if (mddev->unit == dev) {
289 new->md_minor = MINOR(dev);
290 new->hold_active = UNTIL_STOP;
291 list_add(&new->all_mddevs, &all_mddevs);
292 spin_unlock(&all_mddevs_lock);
295 spin_unlock(&all_mddevs_lock);
297 new = kzalloc(sizeof(*new), GFP_KERNEL);
302 if (MAJOR(unit) == MD_MAJOR)
303 new->md_minor = MINOR(unit);
305 new->md_minor = MINOR(unit) >> MdpMinorShift;
307 mutex_init(&new->reconfig_mutex);
308 INIT_LIST_HEAD(&new->disks);
309 INIT_LIST_HEAD(&new->all_mddevs);
310 init_timer(&new->safemode_timer);
311 atomic_set(&new->active, 1);
312 atomic_set(&new->openers, 0);
313 spin_lock_init(&new->write_lock);
314 init_waitqueue_head(&new->sb_wait);
315 init_waitqueue_head(&new->recovery_wait);
316 new->reshape_position = MaxSector;
318 new->resync_max = MaxSector;
319 new->level = LEVEL_NONE;
324 static inline int mddev_lock(mddev_t * mddev)
326 return mutex_lock_interruptible(&mddev->reconfig_mutex);
329 static inline int mddev_trylock(mddev_t * mddev)
331 return mutex_trylock(&mddev->reconfig_mutex);
334 static inline void mddev_unlock(mddev_t * mddev)
336 mutex_unlock(&mddev->reconfig_mutex);
338 md_wakeup_thread(mddev->thread);
341 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
345 list_for_each_entry(rdev, &mddev->disks, same_set)
346 if (rdev->desc_nr == nr)
352 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
356 list_for_each_entry(rdev, &mddev->disks, same_set)
357 if (rdev->bdev->bd_dev == dev)
363 static struct mdk_personality *find_pers(int level, char *clevel)
365 struct mdk_personality *pers;
366 list_for_each_entry(pers, &pers_list, list) {
367 if (level != LEVEL_NONE && pers->level == level)
369 if (strcmp(pers->name, clevel)==0)
375 /* return the offset of the super block in 512byte sectors */
376 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
378 sector_t num_sectors = bdev->bd_inode->i_size / 512;
379 return MD_NEW_SIZE_SECTORS(num_sectors);
382 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
384 sector_t num_sectors = rdev->sb_start;
387 num_sectors &= ~((sector_t)chunk_size/512 - 1);
391 static int alloc_disk_sb(mdk_rdev_t * rdev)
396 rdev->sb_page = alloc_page(GFP_KERNEL);
397 if (!rdev->sb_page) {
398 printk(KERN_ALERT "md: out of memory.\n");
405 static void free_disk_sb(mdk_rdev_t * rdev)
408 put_page(rdev->sb_page);
410 rdev->sb_page = NULL;
417 static void super_written(struct bio *bio, int error)
419 mdk_rdev_t *rdev = bio->bi_private;
420 mddev_t *mddev = rdev->mddev;
422 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
423 printk("md: super_written gets error=%d, uptodate=%d\n",
424 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
425 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
426 md_error(mddev, rdev);
429 if (atomic_dec_and_test(&mddev->pending_writes))
430 wake_up(&mddev->sb_wait);
434 static void super_written_barrier(struct bio *bio, int error)
436 struct bio *bio2 = bio->bi_private;
437 mdk_rdev_t *rdev = bio2->bi_private;
438 mddev_t *mddev = rdev->mddev;
440 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
441 error == -EOPNOTSUPP) {
443 /* barriers don't appear to be supported :-( */
444 set_bit(BarriersNotsupp, &rdev->flags);
445 mddev->barriers_work = 0;
446 spin_lock_irqsave(&mddev->write_lock, flags);
447 bio2->bi_next = mddev->biolist;
448 mddev->biolist = bio2;
449 spin_unlock_irqrestore(&mddev->write_lock, flags);
450 wake_up(&mddev->sb_wait);
454 bio->bi_private = rdev;
455 super_written(bio, error);
459 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
460 sector_t sector, int size, struct page *page)
462 /* write first size bytes of page to sector of rdev
463 * Increment mddev->pending_writes before returning
464 * and decrement it on completion, waking up sb_wait
465 * if zero is reached.
466 * If an error occurred, call md_error
468 * As we might need to resubmit the request if BIO_RW_BARRIER
469 * causes ENOTSUPP, we allocate a spare bio...
471 struct bio *bio = bio_alloc(GFP_NOIO, 1);
472 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
474 bio->bi_bdev = rdev->bdev;
475 bio->bi_sector = sector;
476 bio_add_page(bio, page, size, 0);
477 bio->bi_private = rdev;
478 bio->bi_end_io = super_written;
481 atomic_inc(&mddev->pending_writes);
482 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
484 rw |= (1<<BIO_RW_BARRIER);
485 rbio = bio_clone(bio, GFP_NOIO);
486 rbio->bi_private = bio;
487 rbio->bi_end_io = super_written_barrier;
488 submit_bio(rw, rbio);
493 void md_super_wait(mddev_t *mddev)
495 /* wait for all superblock writes that were scheduled to complete.
496 * if any had to be retried (due to BARRIER problems), retry them
500 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
501 if (atomic_read(&mddev->pending_writes)==0)
503 while (mddev->biolist) {
505 spin_lock_irq(&mddev->write_lock);
506 bio = mddev->biolist;
507 mddev->biolist = bio->bi_next ;
509 spin_unlock_irq(&mddev->write_lock);
510 submit_bio(bio->bi_rw, bio);
514 finish_wait(&mddev->sb_wait, &wq);
517 static void bi_complete(struct bio *bio, int error)
519 complete((struct completion*)bio->bi_private);
522 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
523 struct page *page, int rw)
525 struct bio *bio = bio_alloc(GFP_NOIO, 1);
526 struct completion event;
529 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
532 bio->bi_sector = sector;
533 bio_add_page(bio, page, size, 0);
534 init_completion(&event);
535 bio->bi_private = &event;
536 bio->bi_end_io = bi_complete;
538 wait_for_completion(&event);
540 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
544 EXPORT_SYMBOL_GPL(sync_page_io);
546 static int read_disk_sb(mdk_rdev_t * rdev, int size)
548 char b[BDEVNAME_SIZE];
549 if (!rdev->sb_page) {
557 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
563 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
564 bdevname(rdev->bdev,b));
568 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
570 return sb1->set_uuid0 == sb2->set_uuid0 &&
571 sb1->set_uuid1 == sb2->set_uuid1 &&
572 sb1->set_uuid2 == sb2->set_uuid2 &&
573 sb1->set_uuid3 == sb2->set_uuid3;
576 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
579 mdp_super_t *tmp1, *tmp2;
581 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
582 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
584 if (!tmp1 || !tmp2) {
586 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
594 * nr_disks is not constant
599 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
607 static u32 md_csum_fold(u32 csum)
609 csum = (csum & 0xffff) + (csum >> 16);
610 return (csum & 0xffff) + (csum >> 16);
613 static unsigned int calc_sb_csum(mdp_super_t * sb)
616 u32 *sb32 = (u32*)sb;
618 unsigned int disk_csum, csum;
620 disk_csum = sb->sb_csum;
623 for (i = 0; i < MD_SB_BYTES/4 ; i++)
625 csum = (newcsum & 0xffffffff) + (newcsum>>32);
629 /* This used to use csum_partial, which was wrong for several
630 * reasons including that different results are returned on
631 * different architectures. It isn't critical that we get exactly
632 * the same return value as before (we always csum_fold before
633 * testing, and that removes any differences). However as we
634 * know that csum_partial always returned a 16bit value on
635 * alphas, do a fold to maximise conformity to previous behaviour.
637 sb->sb_csum = md_csum_fold(disk_csum);
639 sb->sb_csum = disk_csum;
646 * Handle superblock details.
647 * We want to be able to handle multiple superblock formats
648 * so we have a common interface to them all, and an array of
649 * different handlers.
650 * We rely on user-space to write the initial superblock, and support
651 * reading and updating of superblocks.
652 * Interface methods are:
653 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
654 * loads and validates a superblock on dev.
655 * if refdev != NULL, compare superblocks on both devices
657 * 0 - dev has a superblock that is compatible with refdev
658 * 1 - dev has a superblock that is compatible and newer than refdev
659 * so dev should be used as the refdev in future
660 * -EINVAL superblock incompatible or invalid
661 * -othererror e.g. -EIO
663 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
664 * Verify that dev is acceptable into mddev.
665 * The first time, mddev->raid_disks will be 0, and data from
666 * dev should be merged in. Subsequent calls check that dev
667 * is new enough. Return 0 or -EINVAL
669 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
670 * Update the superblock for rdev with data in mddev
671 * This does not write to disc.
677 struct module *owner;
678 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
680 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
681 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
682 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
683 sector_t num_sectors);
687 * load_super for 0.90.0
689 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
691 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
696 * Calculate the position of the superblock (512byte sectors),
697 * it's at the end of the disk.
699 * It also happens to be a multiple of 4Kb.
701 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
703 ret = read_disk_sb(rdev, MD_SB_BYTES);
708 bdevname(rdev->bdev, b);
709 sb = (mdp_super_t*)page_address(rdev->sb_page);
711 if (sb->md_magic != MD_SB_MAGIC) {
712 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
717 if (sb->major_version != 0 ||
718 sb->minor_version < 90 ||
719 sb->minor_version > 91) {
720 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
721 sb->major_version, sb->minor_version,
726 if (sb->raid_disks <= 0)
729 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
730 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
735 rdev->preferred_minor = sb->md_minor;
736 rdev->data_offset = 0;
737 rdev->sb_size = MD_SB_BYTES;
739 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
740 if (sb->level != 1 && sb->level != 4
741 && sb->level != 5 && sb->level != 6
742 && sb->level != 10) {
743 /* FIXME use a better test */
745 "md: bitmaps not supported for this level.\n");
750 if (sb->level == LEVEL_MULTIPATH)
753 rdev->desc_nr = sb->this_disk.number;
759 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
760 if (!uuid_equal(refsb, sb)) {
761 printk(KERN_WARNING "md: %s has different UUID to %s\n",
762 b, bdevname(refdev->bdev,b2));
765 if (!sb_equal(refsb, sb)) {
766 printk(KERN_WARNING "md: %s has same UUID"
767 " but different superblock to %s\n",
768 b, bdevname(refdev->bdev, b2));
772 ev2 = md_event(refsb);
778 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
780 if (rdev->size < sb->size && sb->level > 1)
781 /* "this cannot possibly happen" ... */
789 * validate_super for 0.90.0
791 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
794 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
795 __u64 ev1 = md_event(sb);
797 rdev->raid_disk = -1;
798 clear_bit(Faulty, &rdev->flags);
799 clear_bit(In_sync, &rdev->flags);
800 clear_bit(WriteMostly, &rdev->flags);
801 clear_bit(BarriersNotsupp, &rdev->flags);
803 if (mddev->raid_disks == 0) {
804 mddev->major_version = 0;
805 mddev->minor_version = sb->minor_version;
806 mddev->patch_version = sb->patch_version;
808 mddev->chunk_size = sb->chunk_size;
809 mddev->ctime = sb->ctime;
810 mddev->utime = sb->utime;
811 mddev->level = sb->level;
812 mddev->clevel[0] = 0;
813 mddev->layout = sb->layout;
814 mddev->raid_disks = sb->raid_disks;
815 mddev->size = sb->size;
817 mddev->bitmap_offset = 0;
818 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
820 if (mddev->minor_version >= 91) {
821 mddev->reshape_position = sb->reshape_position;
822 mddev->delta_disks = sb->delta_disks;
823 mddev->new_level = sb->new_level;
824 mddev->new_layout = sb->new_layout;
825 mddev->new_chunk = sb->new_chunk;
827 mddev->reshape_position = MaxSector;
828 mddev->delta_disks = 0;
829 mddev->new_level = mddev->level;
830 mddev->new_layout = mddev->layout;
831 mddev->new_chunk = mddev->chunk_size;
834 if (sb->state & (1<<MD_SB_CLEAN))
835 mddev->recovery_cp = MaxSector;
837 if (sb->events_hi == sb->cp_events_hi &&
838 sb->events_lo == sb->cp_events_lo) {
839 mddev->recovery_cp = sb->recovery_cp;
841 mddev->recovery_cp = 0;
844 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
845 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
846 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
847 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
849 mddev->max_disks = MD_SB_DISKS;
851 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
852 mddev->bitmap_file == NULL)
853 mddev->bitmap_offset = mddev->default_bitmap_offset;
855 } else if (mddev->pers == NULL) {
856 /* Insist on good event counter while assembling */
858 if (ev1 < mddev->events)
860 } else if (mddev->bitmap) {
861 /* if adding to array with a bitmap, then we can accept an
862 * older device ... but not too old.
864 if (ev1 < mddev->bitmap->events_cleared)
867 if (ev1 < mddev->events)
868 /* just a hot-add of a new device, leave raid_disk at -1 */
872 if (mddev->level != LEVEL_MULTIPATH) {
873 desc = sb->disks + rdev->desc_nr;
875 if (desc->state & (1<<MD_DISK_FAULTY))
876 set_bit(Faulty, &rdev->flags);
877 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
878 desc->raid_disk < mddev->raid_disks */) {
879 set_bit(In_sync, &rdev->flags);
880 rdev->raid_disk = desc->raid_disk;
882 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
883 set_bit(WriteMostly, &rdev->flags);
884 } else /* MULTIPATH are always insync */
885 set_bit(In_sync, &rdev->flags);
890 * sync_super for 0.90.0
892 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
896 int next_spare = mddev->raid_disks;
899 /* make rdev->sb match mddev data..
902 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
903 * 3/ any empty disks < next_spare become removed
905 * disks[0] gets initialised to REMOVED because
906 * we cannot be sure from other fields if it has
907 * been initialised or not.
910 int active=0, working=0,failed=0,spare=0,nr_disks=0;
912 rdev->sb_size = MD_SB_BYTES;
914 sb = (mdp_super_t*)page_address(rdev->sb_page);
916 memset(sb, 0, sizeof(*sb));
918 sb->md_magic = MD_SB_MAGIC;
919 sb->major_version = mddev->major_version;
920 sb->patch_version = mddev->patch_version;
921 sb->gvalid_words = 0; /* ignored */
922 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
923 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
924 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
925 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
927 sb->ctime = mddev->ctime;
928 sb->level = mddev->level;
929 sb->size = mddev->size;
930 sb->raid_disks = mddev->raid_disks;
931 sb->md_minor = mddev->md_minor;
932 sb->not_persistent = 0;
933 sb->utime = mddev->utime;
935 sb->events_hi = (mddev->events>>32);
936 sb->events_lo = (u32)mddev->events;
938 if (mddev->reshape_position == MaxSector)
939 sb->minor_version = 90;
941 sb->minor_version = 91;
942 sb->reshape_position = mddev->reshape_position;
943 sb->new_level = mddev->new_level;
944 sb->delta_disks = mddev->delta_disks;
945 sb->new_layout = mddev->new_layout;
946 sb->new_chunk = mddev->new_chunk;
948 mddev->minor_version = sb->minor_version;
951 sb->recovery_cp = mddev->recovery_cp;
952 sb->cp_events_hi = (mddev->events>>32);
953 sb->cp_events_lo = (u32)mddev->events;
954 if (mddev->recovery_cp == MaxSector)
955 sb->state = (1<< MD_SB_CLEAN);
959 sb->layout = mddev->layout;
960 sb->chunk_size = mddev->chunk_size;
962 if (mddev->bitmap && mddev->bitmap_file == NULL)
963 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
965 sb->disks[0].state = (1<<MD_DISK_REMOVED);
966 list_for_each_entry(rdev2, &mddev->disks, same_set) {
969 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
970 && !test_bit(Faulty, &rdev2->flags))
971 desc_nr = rdev2->raid_disk;
973 desc_nr = next_spare++;
974 rdev2->desc_nr = desc_nr;
975 d = &sb->disks[rdev2->desc_nr];
977 d->number = rdev2->desc_nr;
978 d->major = MAJOR(rdev2->bdev->bd_dev);
979 d->minor = MINOR(rdev2->bdev->bd_dev);
980 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
981 && !test_bit(Faulty, &rdev2->flags))
982 d->raid_disk = rdev2->raid_disk;
984 d->raid_disk = rdev2->desc_nr; /* compatibility */
985 if (test_bit(Faulty, &rdev2->flags))
986 d->state = (1<<MD_DISK_FAULTY);
987 else if (test_bit(In_sync, &rdev2->flags)) {
988 d->state = (1<<MD_DISK_ACTIVE);
989 d->state |= (1<<MD_DISK_SYNC);
997 if (test_bit(WriteMostly, &rdev2->flags))
998 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1000 /* now set the "removed" and "faulty" bits on any missing devices */
1001 for (i=0 ; i < mddev->raid_disks ; i++) {
1002 mdp_disk_t *d = &sb->disks[i];
1003 if (d->state == 0 && d->number == 0) {
1006 d->state = (1<<MD_DISK_REMOVED);
1007 d->state |= (1<<MD_DISK_FAULTY);
1011 sb->nr_disks = nr_disks;
1012 sb->active_disks = active;
1013 sb->working_disks = working;
1014 sb->failed_disks = failed;
1015 sb->spare_disks = spare;
1017 sb->this_disk = sb->disks[rdev->desc_nr];
1018 sb->sb_csum = calc_sb_csum(sb);
1022 * rdev_size_change for 0.90.0
1024 static unsigned long long
1025 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1027 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1028 return 0; /* component must fit device */
1029 if (rdev->mddev->bitmap_offset)
1030 return 0; /* can't move bitmap */
1031 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1032 if (!num_sectors || num_sectors > rdev->sb_start)
1033 num_sectors = rdev->sb_start;
1034 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1036 md_super_wait(rdev->mddev);
1037 return num_sectors / 2; /* kB for sysfs */
1042 * version 1 superblock
1045 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1049 unsigned long long newcsum;
1050 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1051 __le32 *isuper = (__le32*)sb;
1054 disk_csum = sb->sb_csum;
1057 for (i=0; size>=4; size -= 4 )
1058 newcsum += le32_to_cpu(*isuper++);
1061 newcsum += le16_to_cpu(*(__le16*) isuper);
1063 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1064 sb->sb_csum = disk_csum;
1065 return cpu_to_le32(csum);
1068 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1070 struct mdp_superblock_1 *sb;
1073 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1077 * Calculate the position of the superblock in 512byte sectors.
1078 * It is always aligned to a 4K boundary and
1079 * depeding on minor_version, it can be:
1080 * 0: At least 8K, but less than 12K, from end of device
1081 * 1: At start of device
1082 * 2: 4K from start of device.
1084 switch(minor_version) {
1086 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1088 sb_start &= ~(sector_t)(4*2-1);
1099 rdev->sb_start = sb_start;
1101 /* superblock is rarely larger than 1K, but it can be larger,
1102 * and it is safe to read 4k, so we do that
1104 ret = read_disk_sb(rdev, 4096);
1105 if (ret) return ret;
1108 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1110 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1111 sb->major_version != cpu_to_le32(1) ||
1112 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1113 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1114 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1117 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1118 printk("md: invalid superblock checksum on %s\n",
1119 bdevname(rdev->bdev,b));
1122 if (le64_to_cpu(sb->data_size) < 10) {
1123 printk("md: data_size too small on %s\n",
1124 bdevname(rdev->bdev,b));
1127 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1128 if (sb->level != cpu_to_le32(1) &&
1129 sb->level != cpu_to_le32(4) &&
1130 sb->level != cpu_to_le32(5) &&
1131 sb->level != cpu_to_le32(6) &&
1132 sb->level != cpu_to_le32(10)) {
1134 "md: bitmaps not supported for this level.\n");
1139 rdev->preferred_minor = 0xffff;
1140 rdev->data_offset = le64_to_cpu(sb->data_offset);
1141 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1143 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1144 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1145 if (rdev->sb_size & bmask)
1146 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1149 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1152 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1155 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1161 struct mdp_superblock_1 *refsb =
1162 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1164 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1165 sb->level != refsb->level ||
1166 sb->layout != refsb->layout ||
1167 sb->chunksize != refsb->chunksize) {
1168 printk(KERN_WARNING "md: %s has strangely different"
1169 " superblock to %s\n",
1170 bdevname(rdev->bdev,b),
1171 bdevname(refdev->bdev,b2));
1174 ev1 = le64_to_cpu(sb->events);
1175 ev2 = le64_to_cpu(refsb->events);
1183 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1185 rdev->size = rdev->sb_start / 2;
1186 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1188 rdev->size = le64_to_cpu(sb->data_size)/2;
1189 if (le32_to_cpu(sb->chunksize))
1190 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1192 if (le64_to_cpu(sb->size) > rdev->size*2)
1197 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1199 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1200 __u64 ev1 = le64_to_cpu(sb->events);
1202 rdev->raid_disk = -1;
1203 clear_bit(Faulty, &rdev->flags);
1204 clear_bit(In_sync, &rdev->flags);
1205 clear_bit(WriteMostly, &rdev->flags);
1206 clear_bit(BarriersNotsupp, &rdev->flags);
1208 if (mddev->raid_disks == 0) {
1209 mddev->major_version = 1;
1210 mddev->patch_version = 0;
1211 mddev->external = 0;
1212 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1213 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1214 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1215 mddev->level = le32_to_cpu(sb->level);
1216 mddev->clevel[0] = 0;
1217 mddev->layout = le32_to_cpu(sb->layout);
1218 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1219 mddev->size = le64_to_cpu(sb->size)/2;
1220 mddev->events = ev1;
1221 mddev->bitmap_offset = 0;
1222 mddev->default_bitmap_offset = 1024 >> 9;
1224 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1225 memcpy(mddev->uuid, sb->set_uuid, 16);
1227 mddev->max_disks = (4096-256)/2;
1229 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1230 mddev->bitmap_file == NULL )
1231 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1233 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1234 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1235 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1236 mddev->new_level = le32_to_cpu(sb->new_level);
1237 mddev->new_layout = le32_to_cpu(sb->new_layout);
1238 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1240 mddev->reshape_position = MaxSector;
1241 mddev->delta_disks = 0;
1242 mddev->new_level = mddev->level;
1243 mddev->new_layout = mddev->layout;
1244 mddev->new_chunk = mddev->chunk_size;
1247 } else if (mddev->pers == NULL) {
1248 /* Insist of good event counter while assembling */
1250 if (ev1 < mddev->events)
1252 } else if (mddev->bitmap) {
1253 /* If adding to array with a bitmap, then we can accept an
1254 * older device, but not too old.
1256 if (ev1 < mddev->bitmap->events_cleared)
1259 if (ev1 < mddev->events)
1260 /* just a hot-add of a new device, leave raid_disk at -1 */
1263 if (mddev->level != LEVEL_MULTIPATH) {
1265 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1267 case 0xffff: /* spare */
1269 case 0xfffe: /* faulty */
1270 set_bit(Faulty, &rdev->flags);
1273 if ((le32_to_cpu(sb->feature_map) &
1274 MD_FEATURE_RECOVERY_OFFSET))
1275 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1277 set_bit(In_sync, &rdev->flags);
1278 rdev->raid_disk = role;
1281 if (sb->devflags & WriteMostly1)
1282 set_bit(WriteMostly, &rdev->flags);
1283 } else /* MULTIPATH are always insync */
1284 set_bit(In_sync, &rdev->flags);
1289 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1291 struct mdp_superblock_1 *sb;
1294 /* make rdev->sb match mddev and rdev data. */
1296 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1298 sb->feature_map = 0;
1300 sb->recovery_offset = cpu_to_le64(0);
1301 memset(sb->pad1, 0, sizeof(sb->pad1));
1302 memset(sb->pad2, 0, sizeof(sb->pad2));
1303 memset(sb->pad3, 0, sizeof(sb->pad3));
1305 sb->utime = cpu_to_le64((__u64)mddev->utime);
1306 sb->events = cpu_to_le64(mddev->events);
1308 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1310 sb->resync_offset = cpu_to_le64(0);
1312 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1314 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1315 sb->size = cpu_to_le64(mddev->size<<1);
1317 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1318 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1319 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1322 if (rdev->raid_disk >= 0 &&
1323 !test_bit(In_sync, &rdev->flags) &&
1324 rdev->recovery_offset > 0) {
1325 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1326 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1329 if (mddev->reshape_position != MaxSector) {
1330 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1331 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1332 sb->new_layout = cpu_to_le32(mddev->new_layout);
1333 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1334 sb->new_level = cpu_to_le32(mddev->new_level);
1335 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1339 list_for_each_entry(rdev2, &mddev->disks, same_set)
1340 if (rdev2->desc_nr+1 > max_dev)
1341 max_dev = rdev2->desc_nr+1;
1343 if (max_dev > le32_to_cpu(sb->max_dev))
1344 sb->max_dev = cpu_to_le32(max_dev);
1345 for (i=0; i<max_dev;i++)
1346 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1348 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1350 if (test_bit(Faulty, &rdev2->flags))
1351 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1352 else if (test_bit(In_sync, &rdev2->flags))
1353 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1354 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1355 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1357 sb->dev_roles[i] = cpu_to_le16(0xffff);
1360 sb->sb_csum = calc_sb_1_csum(sb);
1363 static unsigned long long
1364 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1366 struct mdp_superblock_1 *sb;
1367 sector_t max_sectors;
1368 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1369 return 0; /* component must fit device */
1370 if (rdev->sb_start < rdev->data_offset) {
1371 /* minor versions 1 and 2; superblock before data */
1372 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1373 max_sectors -= rdev->data_offset;
1374 if (!num_sectors || num_sectors > max_sectors)
1375 num_sectors = max_sectors;
1376 } else if (rdev->mddev->bitmap_offset) {
1377 /* minor version 0 with bitmap we can't move */
1380 /* minor version 0; superblock after data */
1382 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1383 sb_start &= ~(sector_t)(4*2 - 1);
1384 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1385 if (!num_sectors || num_sectors > max_sectors)
1386 num_sectors = max_sectors;
1387 rdev->sb_start = sb_start;
1389 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1390 sb->data_size = cpu_to_le64(num_sectors);
1391 sb->super_offset = rdev->sb_start;
1392 sb->sb_csum = calc_sb_1_csum(sb);
1393 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1395 md_super_wait(rdev->mddev);
1396 return num_sectors / 2; /* kB for sysfs */
1399 static struct super_type super_types[] = {
1402 .owner = THIS_MODULE,
1403 .load_super = super_90_load,
1404 .validate_super = super_90_validate,
1405 .sync_super = super_90_sync,
1406 .rdev_size_change = super_90_rdev_size_change,
1410 .owner = THIS_MODULE,
1411 .load_super = super_1_load,
1412 .validate_super = super_1_validate,
1413 .sync_super = super_1_sync,
1414 .rdev_size_change = super_1_rdev_size_change,
1418 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1420 mdk_rdev_t *rdev, *rdev2;
1423 rdev_for_each_rcu(rdev, mddev1)
1424 rdev_for_each_rcu(rdev2, mddev2)
1425 if (rdev->bdev->bd_contains ==
1426 rdev2->bdev->bd_contains) {
1434 static LIST_HEAD(pending_raid_disks);
1436 static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev)
1438 struct mdk_personality *pers = mddev->pers;
1439 struct gendisk *disk = mddev->gendisk;
1440 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1441 struct blk_integrity *bi_mddev = blk_get_integrity(disk);
1443 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1444 if (pers && pers->level >= 4 && pers->level <= 6)
1447 /* If rdev is integrity capable, register profile for mddev */
1448 if (!bi_mddev && bi_rdev) {
1449 if (blk_integrity_register(disk, bi_rdev))
1450 printk(KERN_ERR "%s: %s Could not register integrity!\n",
1451 __func__, disk->disk_name);
1453 printk(KERN_NOTICE "Enabling data integrity on %s\n",
1458 /* Check that mddev and rdev have matching profiles */
1459 if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) {
1460 printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__,
1461 disk->disk_name, rdev->bdev->bd_disk->disk_name);
1462 printk(KERN_NOTICE "Disabling data integrity on %s\n",
1464 blk_integrity_unregister(disk);
1468 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1470 char b[BDEVNAME_SIZE];
1480 /* prevent duplicates */
1481 if (find_rdev(mddev, rdev->bdev->bd_dev))
1484 /* make sure rdev->size exceeds mddev->size */
1485 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1487 /* Cannot change size, so fail
1488 * If mddev->level <= 0, then we don't care
1489 * about aligning sizes (e.g. linear)
1491 if (mddev->level > 0)
1494 mddev->size = rdev->size;
1497 /* Verify rdev->desc_nr is unique.
1498 * If it is -1, assign a free number, else
1499 * check number is not in use
1501 if (rdev->desc_nr < 0) {
1503 if (mddev->pers) choice = mddev->raid_disks;
1504 while (find_rdev_nr(mddev, choice))
1506 rdev->desc_nr = choice;
1508 if (find_rdev_nr(mddev, rdev->desc_nr))
1511 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1512 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1513 mdname(mddev), mddev->max_disks);
1516 bdevname(rdev->bdev,b);
1517 while ( (s=strchr(b, '/')) != NULL)
1520 rdev->mddev = mddev;
1521 printk(KERN_INFO "md: bind<%s>\n", b);
1523 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1526 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1527 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1528 kobject_del(&rdev->kobj);
1531 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1533 list_add_rcu(&rdev->same_set, &mddev->disks);
1534 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1536 /* May as well allow recovery to be retried once */
1537 mddev->recovery_disabled = 0;
1539 md_integrity_check(rdev, mddev);
1543 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1548 static void md_delayed_delete(struct work_struct *ws)
1550 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1551 kobject_del(&rdev->kobj);
1552 kobject_put(&rdev->kobj);
1555 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1557 char b[BDEVNAME_SIZE];
1562 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1563 list_del_rcu(&rdev->same_set);
1564 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1566 sysfs_remove_link(&rdev->kobj, "block");
1567 sysfs_put(rdev->sysfs_state);
1568 rdev->sysfs_state = NULL;
1569 /* We need to delay this, otherwise we can deadlock when
1570 * writing to 'remove' to "dev/state". We also need
1571 * to delay it due to rcu usage.
1574 INIT_WORK(&rdev->del_work, md_delayed_delete);
1575 kobject_get(&rdev->kobj);
1576 schedule_work(&rdev->del_work);
1580 * prevent the device from being mounted, repartitioned or
1581 * otherwise reused by a RAID array (or any other kernel
1582 * subsystem), by bd_claiming the device.
1584 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1587 struct block_device *bdev;
1588 char b[BDEVNAME_SIZE];
1590 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1592 printk(KERN_ERR "md: could not open %s.\n",
1593 __bdevname(dev, b));
1594 return PTR_ERR(bdev);
1596 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1598 printk(KERN_ERR "md: could not bd_claim %s.\n",
1600 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1604 set_bit(AllReserved, &rdev->flags);
1609 static void unlock_rdev(mdk_rdev_t *rdev)
1611 struct block_device *bdev = rdev->bdev;
1616 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1619 void md_autodetect_dev(dev_t dev);
1621 static void export_rdev(mdk_rdev_t * rdev)
1623 char b[BDEVNAME_SIZE];
1624 printk(KERN_INFO "md: export_rdev(%s)\n",
1625 bdevname(rdev->bdev,b));
1630 if (test_bit(AutoDetected, &rdev->flags))
1631 md_autodetect_dev(rdev->bdev->bd_dev);
1634 kobject_put(&rdev->kobj);
1637 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1639 unbind_rdev_from_array(rdev);
1643 static void export_array(mddev_t *mddev)
1645 mdk_rdev_t *rdev, *tmp;
1647 rdev_for_each(rdev, tmp, mddev) {
1652 kick_rdev_from_array(rdev);
1654 if (!list_empty(&mddev->disks))
1656 mddev->raid_disks = 0;
1657 mddev->major_version = 0;
1660 static void print_desc(mdp_disk_t *desc)
1662 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1663 desc->major,desc->minor,desc->raid_disk,desc->state);
1666 static void print_sb_90(mdp_super_t *sb)
1671 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1672 sb->major_version, sb->minor_version, sb->patch_version,
1673 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1675 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1676 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1677 sb->md_minor, sb->layout, sb->chunk_size);
1678 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1679 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1680 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1681 sb->failed_disks, sb->spare_disks,
1682 sb->sb_csum, (unsigned long)sb->events_lo);
1685 for (i = 0; i < MD_SB_DISKS; i++) {
1688 desc = sb->disks + i;
1689 if (desc->number || desc->major || desc->minor ||
1690 desc->raid_disk || (desc->state && (desc->state != 4))) {
1691 printk(" D %2d: ", i);
1695 printk(KERN_INFO "md: THIS: ");
1696 print_desc(&sb->this_disk);
1699 static void print_sb_1(struct mdp_superblock_1 *sb)
1703 uuid = sb->set_uuid;
1704 printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1705 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1706 KERN_INFO "md: Name: \"%s\" CT:%llu\n",
1707 le32_to_cpu(sb->major_version),
1708 le32_to_cpu(sb->feature_map),
1709 uuid[0], uuid[1], uuid[2], uuid[3],
1710 uuid[4], uuid[5], uuid[6], uuid[7],
1711 uuid[8], uuid[9], uuid[10], uuid[11],
1712 uuid[12], uuid[13], uuid[14], uuid[15],
1714 (unsigned long long)le64_to_cpu(sb->ctime)
1715 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1717 uuid = sb->device_uuid;
1718 printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1720 KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1721 ":%02x%02x%02x%02x%02x%02x\n"
1722 KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1723 KERN_INFO "md: (MaxDev:%u) \n",
1724 le32_to_cpu(sb->level),
1725 (unsigned long long)le64_to_cpu(sb->size),
1726 le32_to_cpu(sb->raid_disks),
1727 le32_to_cpu(sb->layout),
1728 le32_to_cpu(sb->chunksize),
1729 (unsigned long long)le64_to_cpu(sb->data_offset),
1730 (unsigned long long)le64_to_cpu(sb->data_size),
1731 (unsigned long long)le64_to_cpu(sb->super_offset),
1732 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1733 le32_to_cpu(sb->dev_number),
1734 uuid[0], uuid[1], uuid[2], uuid[3],
1735 uuid[4], uuid[5], uuid[6], uuid[7],
1736 uuid[8], uuid[9], uuid[10], uuid[11],
1737 uuid[12], uuid[13], uuid[14], uuid[15],
1739 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1740 (unsigned long long)le64_to_cpu(sb->events),
1741 (unsigned long long)le64_to_cpu(sb->resync_offset),
1742 le32_to_cpu(sb->sb_csum),
1743 le32_to_cpu(sb->max_dev)
1747 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1749 char b[BDEVNAME_SIZE];
1750 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1751 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1752 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1754 if (rdev->sb_loaded) {
1755 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1756 switch (major_version) {
1758 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1761 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1765 printk(KERN_INFO "md: no rdev superblock!\n");
1768 static void md_print_devices(void)
1770 struct list_head *tmp;
1773 char b[BDEVNAME_SIZE];
1776 printk("md: **********************************\n");
1777 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1778 printk("md: **********************************\n");
1779 for_each_mddev(mddev, tmp) {
1782 bitmap_print_sb(mddev->bitmap);
1784 printk("%s: ", mdname(mddev));
1785 list_for_each_entry(rdev, &mddev->disks, same_set)
1786 printk("<%s>", bdevname(rdev->bdev,b));
1789 list_for_each_entry(rdev, &mddev->disks, same_set)
1790 print_rdev(rdev, mddev->major_version);
1792 printk("md: **********************************\n");
1797 static void sync_sbs(mddev_t * mddev, int nospares)
1799 /* Update each superblock (in-memory image), but
1800 * if we are allowed to, skip spares which already
1801 * have the right event counter, or have one earlier
1802 * (which would mean they aren't being marked as dirty
1803 * with the rest of the array)
1807 list_for_each_entry(rdev, &mddev->disks, same_set) {
1808 if (rdev->sb_events == mddev->events ||
1810 rdev->raid_disk < 0 &&
1811 (rdev->sb_events&1)==0 &&
1812 rdev->sb_events+1 == mddev->events)) {
1813 /* Don't update this superblock */
1814 rdev->sb_loaded = 2;
1816 super_types[mddev->major_version].
1817 sync_super(mddev, rdev);
1818 rdev->sb_loaded = 1;
1823 static void md_update_sb(mddev_t * mddev, int force_change)
1829 if (mddev->external)
1832 spin_lock_irq(&mddev->write_lock);
1834 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1835 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1837 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1838 /* just a clean<-> dirty transition, possibly leave spares alone,
1839 * though if events isn't the right even/odd, we will have to do
1845 if (mddev->degraded)
1846 /* If the array is degraded, then skipping spares is both
1847 * dangerous and fairly pointless.
1848 * Dangerous because a device that was removed from the array
1849 * might have a event_count that still looks up-to-date,
1850 * so it can be re-added without a resync.
1851 * Pointless because if there are any spares to skip,
1852 * then a recovery will happen and soon that array won't
1853 * be degraded any more and the spare can go back to sleep then.
1857 sync_req = mddev->in_sync;
1858 mddev->utime = get_seconds();
1860 /* If this is just a dirty<->clean transition, and the array is clean
1861 * and 'events' is odd, we can roll back to the previous clean state */
1863 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1864 && (mddev->events & 1)
1865 && mddev->events != 1)
1868 /* otherwise we have to go forward and ... */
1870 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1871 /* .. if the array isn't clean, insist on an odd 'events' */
1872 if ((mddev->events&1)==0) {
1877 /* otherwise insist on an even 'events' (for clean states) */
1878 if ((mddev->events&1)) {
1885 if (!mddev->events) {
1887 * oops, this 64-bit counter should never wrap.
1888 * Either we are in around ~1 trillion A.C., assuming
1889 * 1 reboot per second, or we have a bug:
1896 * do not write anything to disk if using
1897 * nonpersistent superblocks
1899 if (!mddev->persistent) {
1900 if (!mddev->external)
1901 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1903 spin_unlock_irq(&mddev->write_lock);
1904 wake_up(&mddev->sb_wait);
1907 sync_sbs(mddev, nospares);
1908 spin_unlock_irq(&mddev->write_lock);
1911 "md: updating %s RAID superblock on device (in sync %d)\n",
1912 mdname(mddev),mddev->in_sync);
1914 bitmap_update_sb(mddev->bitmap);
1915 list_for_each_entry(rdev, &mddev->disks, same_set) {
1916 char b[BDEVNAME_SIZE];
1917 dprintk(KERN_INFO "md: ");
1918 if (rdev->sb_loaded != 1)
1919 continue; /* no noise on spare devices */
1920 if (test_bit(Faulty, &rdev->flags))
1921 dprintk("(skipping faulty ");
1923 dprintk("%s ", bdevname(rdev->bdev,b));
1924 if (!test_bit(Faulty, &rdev->flags)) {
1925 md_super_write(mddev,rdev,
1926 rdev->sb_start, rdev->sb_size,
1928 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1929 bdevname(rdev->bdev,b),
1930 (unsigned long long)rdev->sb_start);
1931 rdev->sb_events = mddev->events;
1935 if (mddev->level == LEVEL_MULTIPATH)
1936 /* only need to write one superblock... */
1939 md_super_wait(mddev);
1940 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1942 spin_lock_irq(&mddev->write_lock);
1943 if (mddev->in_sync != sync_req ||
1944 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1945 /* have to write it out again */
1946 spin_unlock_irq(&mddev->write_lock);
1949 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1950 spin_unlock_irq(&mddev->write_lock);
1951 wake_up(&mddev->sb_wait);
1955 /* words written to sysfs files may, or may not, be \n terminated.
1956 * We want to accept with case. For this we use cmd_match.
1958 static int cmd_match(const char *cmd, const char *str)
1960 /* See if cmd, written into a sysfs file, matches
1961 * str. They must either be the same, or cmd can
1962 * have a trailing newline
1964 while (*cmd && *str && *cmd == *str) {
1975 struct rdev_sysfs_entry {
1976 struct attribute attr;
1977 ssize_t (*show)(mdk_rdev_t *, char *);
1978 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1982 state_show(mdk_rdev_t *rdev, char *page)
1987 if (test_bit(Faulty, &rdev->flags)) {
1988 len+= sprintf(page+len, "%sfaulty",sep);
1991 if (test_bit(In_sync, &rdev->flags)) {
1992 len += sprintf(page+len, "%sin_sync",sep);
1995 if (test_bit(WriteMostly, &rdev->flags)) {
1996 len += sprintf(page+len, "%swrite_mostly",sep);
1999 if (test_bit(Blocked, &rdev->flags)) {
2000 len += sprintf(page+len, "%sblocked", sep);
2003 if (!test_bit(Faulty, &rdev->flags) &&
2004 !test_bit(In_sync, &rdev->flags)) {
2005 len += sprintf(page+len, "%sspare", sep);
2008 return len+sprintf(page+len, "\n");
2012 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2015 * faulty - simulates and error
2016 * remove - disconnects the device
2017 * writemostly - sets write_mostly
2018 * -writemostly - clears write_mostly
2019 * blocked - sets the Blocked flag
2020 * -blocked - clears the Blocked flag
2023 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2024 md_error(rdev->mddev, rdev);
2026 } else if (cmd_match(buf, "remove")) {
2027 if (rdev->raid_disk >= 0)
2030 mddev_t *mddev = rdev->mddev;
2031 kick_rdev_from_array(rdev);
2033 md_update_sb(mddev, 1);
2034 md_new_event(mddev);
2037 } else if (cmd_match(buf, "writemostly")) {
2038 set_bit(WriteMostly, &rdev->flags);
2040 } else if (cmd_match(buf, "-writemostly")) {
2041 clear_bit(WriteMostly, &rdev->flags);
2043 } else if (cmd_match(buf, "blocked")) {
2044 set_bit(Blocked, &rdev->flags);
2046 } else if (cmd_match(buf, "-blocked")) {
2047 clear_bit(Blocked, &rdev->flags);
2048 wake_up(&rdev->blocked_wait);
2049 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2050 md_wakeup_thread(rdev->mddev->thread);
2054 if (!err && rdev->sysfs_state)
2055 sysfs_notify_dirent(rdev->sysfs_state);
2056 return err ? err : len;
2058 static struct rdev_sysfs_entry rdev_state =
2059 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2062 errors_show(mdk_rdev_t *rdev, char *page)
2064 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2068 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2071 unsigned long n = simple_strtoul(buf, &e, 10);
2072 if (*buf && (*e == 0 || *e == '\n')) {
2073 atomic_set(&rdev->corrected_errors, n);
2078 static struct rdev_sysfs_entry rdev_errors =
2079 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2082 slot_show(mdk_rdev_t *rdev, char *page)
2084 if (rdev->raid_disk < 0)
2085 return sprintf(page, "none\n");
2087 return sprintf(page, "%d\n", rdev->raid_disk);
2091 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2096 int slot = simple_strtoul(buf, &e, 10);
2097 if (strncmp(buf, "none", 4)==0)
2099 else if (e==buf || (*e && *e!= '\n'))
2101 if (rdev->mddev->pers && slot == -1) {
2102 /* Setting 'slot' on an active array requires also
2103 * updating the 'rd%d' link, and communicating
2104 * with the personality with ->hot_*_disk.
2105 * For now we only support removing
2106 * failed/spare devices. This normally happens automatically,
2107 * but not when the metadata is externally managed.
2109 if (rdev->raid_disk == -1)
2111 /* personality does all needed checks */
2112 if (rdev->mddev->pers->hot_add_disk == NULL)
2114 err = rdev->mddev->pers->
2115 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2118 sprintf(nm, "rd%d", rdev->raid_disk);
2119 sysfs_remove_link(&rdev->mddev->kobj, nm);
2120 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2121 md_wakeup_thread(rdev->mddev->thread);
2122 } else if (rdev->mddev->pers) {
2124 /* Activating a spare .. or possibly reactivating
2125 * if we every get bitmaps working here.
2128 if (rdev->raid_disk != -1)
2131 if (rdev->mddev->pers->hot_add_disk == NULL)
2134 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2135 if (rdev2->raid_disk == slot)
2138 rdev->raid_disk = slot;
2139 if (test_bit(In_sync, &rdev->flags))
2140 rdev->saved_raid_disk = slot;
2142 rdev->saved_raid_disk = -1;
2143 err = rdev->mddev->pers->
2144 hot_add_disk(rdev->mddev, rdev);
2146 rdev->raid_disk = -1;
2149 sysfs_notify_dirent(rdev->sysfs_state);
2150 sprintf(nm, "rd%d", rdev->raid_disk);
2151 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2153 "md: cannot register "
2155 nm, mdname(rdev->mddev));
2157 /* don't wakeup anyone, leave that to userspace. */
2159 if (slot >= rdev->mddev->raid_disks)
2161 rdev->raid_disk = slot;
2162 /* assume it is working */
2163 clear_bit(Faulty, &rdev->flags);
2164 clear_bit(WriteMostly, &rdev->flags);
2165 set_bit(In_sync, &rdev->flags);
2166 sysfs_notify_dirent(rdev->sysfs_state);
2172 static struct rdev_sysfs_entry rdev_slot =
2173 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2176 offset_show(mdk_rdev_t *rdev, char *page)
2178 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2182 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2185 unsigned long long offset = simple_strtoull(buf, &e, 10);
2186 if (e==buf || (*e && *e != '\n'))
2188 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2190 if (rdev->size && rdev->mddev->external)
2191 /* Must set offset before size, so overlap checks
2194 rdev->data_offset = offset;
2198 static struct rdev_sysfs_entry rdev_offset =
2199 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2202 rdev_size_show(mdk_rdev_t *rdev, char *page)
2204 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2207 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2209 /* check if two start/length pairs overlap */
2218 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2220 unsigned long long size;
2221 unsigned long long oldsize = rdev->size;
2222 mddev_t *my_mddev = rdev->mddev;
2224 if (strict_strtoull(buf, 10, &size) < 0)
2226 if (my_mddev->pers && rdev->raid_disk >= 0) {
2227 if (my_mddev->persistent) {
2228 size = super_types[my_mddev->major_version].
2229 rdev_size_change(rdev, size * 2);
2233 size = (rdev->bdev->bd_inode->i_size >> 10);
2234 size -= rdev->data_offset/2;
2237 if (size < my_mddev->size)
2238 return -EINVAL; /* component must fit device */
2241 if (size > oldsize && my_mddev->external) {
2242 /* need to check that all other rdevs with the same ->bdev
2243 * do not overlap. We need to unlock the mddev to avoid
2244 * a deadlock. We have already changed rdev->size, and if
2245 * we have to change it back, we will have the lock again.
2249 struct list_head *tmp;
2251 mddev_unlock(my_mddev);
2252 for_each_mddev(mddev, tmp) {
2256 list_for_each_entry(rdev2, &mddev->disks, same_set)
2257 if (test_bit(AllReserved, &rdev2->flags) ||
2258 (rdev->bdev == rdev2->bdev &&
2260 overlaps(rdev->data_offset, rdev->size * 2,
2262 rdev2->size * 2))) {
2266 mddev_unlock(mddev);
2272 mddev_lock(my_mddev);
2274 /* Someone else could have slipped in a size
2275 * change here, but doing so is just silly.
2276 * We put oldsize back because we *know* it is
2277 * safe, and trust userspace not to race with
2280 rdev->size = oldsize;
2287 static struct rdev_sysfs_entry rdev_size =
2288 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2290 static struct attribute *rdev_default_attrs[] = {
2299 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2301 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2302 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2303 mddev_t *mddev = rdev->mddev;
2309 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2311 if (rdev->mddev == NULL)
2314 rv = entry->show(rdev, page);
2315 mddev_unlock(mddev);
2321 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2322 const char *page, size_t length)
2324 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2325 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2327 mddev_t *mddev = rdev->mddev;
2331 if (!capable(CAP_SYS_ADMIN))
2333 rv = mddev ? mddev_lock(mddev): -EBUSY;
2335 if (rdev->mddev == NULL)
2338 rv = entry->store(rdev, page, length);
2339 mddev_unlock(mddev);
2344 static void rdev_free(struct kobject *ko)
2346 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2349 static struct sysfs_ops rdev_sysfs_ops = {
2350 .show = rdev_attr_show,
2351 .store = rdev_attr_store,
2353 static struct kobj_type rdev_ktype = {
2354 .release = rdev_free,
2355 .sysfs_ops = &rdev_sysfs_ops,
2356 .default_attrs = rdev_default_attrs,
2360 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2362 * mark the device faulty if:
2364 * - the device is nonexistent (zero size)
2365 * - the device has no valid superblock
2367 * a faulty rdev _never_ has rdev->sb set.
2369 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2371 char b[BDEVNAME_SIZE];
2376 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2378 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2379 return ERR_PTR(-ENOMEM);
2382 if ((err = alloc_disk_sb(rdev)))
2385 err = lock_rdev(rdev, newdev, super_format == -2);
2389 kobject_init(&rdev->kobj, &rdev_ktype);
2392 rdev->saved_raid_disk = -1;
2393 rdev->raid_disk = -1;
2395 rdev->data_offset = 0;
2396 rdev->sb_events = 0;
2397 atomic_set(&rdev->nr_pending, 0);
2398 atomic_set(&rdev->read_errors, 0);
2399 atomic_set(&rdev->corrected_errors, 0);
2401 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2404 "md: %s has zero or unknown size, marking faulty!\n",
2405 bdevname(rdev->bdev,b));
2410 if (super_format >= 0) {
2411 err = super_types[super_format].
2412 load_super(rdev, NULL, super_minor);
2413 if (err == -EINVAL) {
2415 "md: %s does not have a valid v%d.%d "
2416 "superblock, not importing!\n",
2417 bdevname(rdev->bdev,b),
2418 super_format, super_minor);
2423 "md: could not read %s's sb, not importing!\n",
2424 bdevname(rdev->bdev,b));
2429 INIT_LIST_HEAD(&rdev->same_set);
2430 init_waitqueue_head(&rdev->blocked_wait);
2435 if (rdev->sb_page) {
2441 return ERR_PTR(err);
2445 * Check a full RAID array for plausibility
2449 static void analyze_sbs(mddev_t * mddev)
2452 mdk_rdev_t *rdev, *freshest, *tmp;
2453 char b[BDEVNAME_SIZE];
2456 rdev_for_each(rdev, tmp, mddev)
2457 switch (super_types[mddev->major_version].
2458 load_super(rdev, freshest, mddev->minor_version)) {
2466 "md: fatal superblock inconsistency in %s"
2467 " -- removing from array\n",
2468 bdevname(rdev->bdev,b));
2469 kick_rdev_from_array(rdev);
2473 super_types[mddev->major_version].
2474 validate_super(mddev, freshest);
2477 rdev_for_each(rdev, tmp, mddev) {
2478 if (rdev->desc_nr >= mddev->max_disks ||
2479 i > mddev->max_disks) {
2481 "md: %s: %s: only %d devices permitted\n",
2482 mdname(mddev), bdevname(rdev->bdev, b),
2484 kick_rdev_from_array(rdev);
2487 if (rdev != freshest)
2488 if (super_types[mddev->major_version].
2489 validate_super(mddev, rdev)) {
2490 printk(KERN_WARNING "md: kicking non-fresh %s"
2492 bdevname(rdev->bdev,b));
2493 kick_rdev_from_array(rdev);
2496 if (mddev->level == LEVEL_MULTIPATH) {
2497 rdev->desc_nr = i++;
2498 rdev->raid_disk = rdev->desc_nr;
2499 set_bit(In_sync, &rdev->flags);
2500 } else if (rdev->raid_disk >= mddev->raid_disks) {
2501 rdev->raid_disk = -1;
2502 clear_bit(In_sync, &rdev->flags);
2508 if (mddev->recovery_cp != MaxSector &&
2510 printk(KERN_ERR "md: %s: raid array is not clean"
2511 " -- starting background reconstruction\n",
2516 static void md_safemode_timeout(unsigned long data);
2519 safe_delay_show(mddev_t *mddev, char *page)
2521 int msec = (mddev->safemode_delay*1000)/HZ;
2522 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2525 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2533 /* remove a period, and count digits after it */
2534 if (len >= sizeof(buf))
2536 strlcpy(buf, cbuf, sizeof(buf));
2537 for (i=0; i<len; i++) {
2539 if (isdigit(buf[i])) {
2544 } else if (buf[i] == '.') {
2549 if (strict_strtoul(buf, 10, &msec) < 0)
2551 msec = (msec * 1000) / scale;
2553 mddev->safemode_delay = 0;
2555 unsigned long old_delay = mddev->safemode_delay;
2556 mddev->safemode_delay = (msec*HZ)/1000;
2557 if (mddev->safemode_delay == 0)
2558 mddev->safemode_delay = 1;
2559 if (mddev->safemode_delay < old_delay)
2560 md_safemode_timeout((unsigned long)mddev);
2564 static struct md_sysfs_entry md_safe_delay =
2565 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2568 level_show(mddev_t *mddev, char *page)
2570 struct mdk_personality *p = mddev->pers;
2572 return sprintf(page, "%s\n", p->name);
2573 else if (mddev->clevel[0])
2574 return sprintf(page, "%s\n", mddev->clevel);
2575 else if (mddev->level != LEVEL_NONE)
2576 return sprintf(page, "%d\n", mddev->level);
2582 level_store(mddev_t *mddev, const char *buf, size_t len)
2589 if (len >= sizeof(mddev->clevel))
2591 strncpy(mddev->clevel, buf, len);
2592 if (mddev->clevel[len-1] == '\n')
2594 mddev->clevel[len] = 0;
2595 mddev->level = LEVEL_NONE;
2599 static struct md_sysfs_entry md_level =
2600 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2604 layout_show(mddev_t *mddev, char *page)
2606 /* just a number, not meaningful for all levels */
2607 if (mddev->reshape_position != MaxSector &&
2608 mddev->layout != mddev->new_layout)
2609 return sprintf(page, "%d (%d)\n",
2610 mddev->new_layout, mddev->layout);
2611 return sprintf(page, "%d\n", mddev->layout);
2615 layout_store(mddev_t *mddev, const char *buf, size_t len)
2618 unsigned long n = simple_strtoul(buf, &e, 10);
2620 if (!*buf || (*e && *e != '\n'))
2625 if (mddev->reshape_position != MaxSector)
2626 mddev->new_layout = n;
2631 static struct md_sysfs_entry md_layout =
2632 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2636 raid_disks_show(mddev_t *mddev, char *page)
2638 if (mddev->raid_disks == 0)
2640 if (mddev->reshape_position != MaxSector &&
2641 mddev->delta_disks != 0)
2642 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2643 mddev->raid_disks - mddev->delta_disks);
2644 return sprintf(page, "%d\n", mddev->raid_disks);
2647 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2650 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2654 unsigned long n = simple_strtoul(buf, &e, 10);
2656 if (!*buf || (*e && *e != '\n'))
2660 rv = update_raid_disks(mddev, n);
2661 else if (mddev->reshape_position != MaxSector) {
2662 int olddisks = mddev->raid_disks - mddev->delta_disks;
2663 mddev->delta_disks = n - olddisks;
2664 mddev->raid_disks = n;
2666 mddev->raid_disks = n;
2667 return rv ? rv : len;
2669 static struct md_sysfs_entry md_raid_disks =
2670 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2673 chunk_size_show(mddev_t *mddev, char *page)
2675 if (mddev->reshape_position != MaxSector &&
2676 mddev->chunk_size != mddev->new_chunk)
2677 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2679 return sprintf(page, "%d\n", mddev->chunk_size);
2683 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2685 /* can only set chunk_size if array is not yet active */
2687 unsigned long n = simple_strtoul(buf, &e, 10);
2689 if (!*buf || (*e && *e != '\n'))
2694 else if (mddev->reshape_position != MaxSector)
2695 mddev->new_chunk = n;
2697 mddev->chunk_size = n;
2700 static struct md_sysfs_entry md_chunk_size =
2701 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2704 resync_start_show(mddev_t *mddev, char *page)
2706 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2710 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2713 unsigned long long n = simple_strtoull(buf, &e, 10);
2717 if (!*buf || (*e && *e != '\n'))
2720 mddev->recovery_cp = n;
2723 static struct md_sysfs_entry md_resync_start =
2724 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2727 * The array state can be:
2730 * No devices, no size, no level
2731 * Equivalent to STOP_ARRAY ioctl
2733 * May have some settings, but array is not active
2734 * all IO results in error
2735 * When written, doesn't tear down array, but just stops it
2736 * suspended (not supported yet)
2737 * All IO requests will block. The array can be reconfigured.
2738 * Writing this, if accepted, will block until array is quiescent
2740 * no resync can happen. no superblocks get written.
2741 * write requests fail
2743 * like readonly, but behaves like 'clean' on a write request.
2745 * clean - no pending writes, but otherwise active.
2746 * When written to inactive array, starts without resync
2747 * If a write request arrives then
2748 * if metadata is known, mark 'dirty' and switch to 'active'.
2749 * if not known, block and switch to write-pending
2750 * If written to an active array that has pending writes, then fails.
2752 * fully active: IO and resync can be happening.
2753 * When written to inactive array, starts with resync
2756 * clean, but writes are blocked waiting for 'active' to be written.
2759 * like active, but no writes have been seen for a while (100msec).
2762 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2763 write_pending, active_idle, bad_word};
2764 static char *array_states[] = {
2765 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2766 "write-pending", "active-idle", NULL };
2768 static int match_word(const char *word, char **list)
2771 for (n=0; list[n]; n++)
2772 if (cmd_match(word, list[n]))
2778 array_state_show(mddev_t *mddev, char *page)
2780 enum array_state st = inactive;
2793 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2795 else if (mddev->safemode)
2801 if (list_empty(&mddev->disks) &&
2802 mddev->raid_disks == 0 &&
2808 return sprintf(page, "%s\n", array_states[st]);
2811 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2812 static int do_md_run(mddev_t * mddev);
2813 static int restart_array(mddev_t *mddev);
2816 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2819 enum array_state st = match_word(buf, array_states);
2824 /* stopping an active array */
2825 if (atomic_read(&mddev->openers) > 0)
2827 err = do_md_stop(mddev, 0, 0);
2830 /* stopping an active array */
2832 if (atomic_read(&mddev->openers) > 0)
2834 err = do_md_stop(mddev, 2, 0);
2836 err = 0; /* already inactive */
2839 break; /* not supported yet */
2842 err = do_md_stop(mddev, 1, 0);
2845 set_disk_ro(mddev->gendisk, 1);
2846 err = do_md_run(mddev);
2852 err = do_md_stop(mddev, 1, 0);
2853 else if (mddev->ro == 1)
2854 err = restart_array(mddev);
2857 set_disk_ro(mddev->gendisk, 0);
2861 err = do_md_run(mddev);
2866 restart_array(mddev);
2867 spin_lock_irq(&mddev->write_lock);
2868 if (atomic_read(&mddev->writes_pending) == 0) {
2869 if (mddev->in_sync == 0) {
2871 if (mddev->safemode == 1)
2872 mddev->safemode = 0;
2873 if (mddev->persistent)
2874 set_bit(MD_CHANGE_CLEAN,
2880 spin_unlock_irq(&mddev->write_lock);
2883 mddev->recovery_cp = MaxSector;
2884 err = do_md_run(mddev);
2889 restart_array(mddev);
2890 if (mddev->external)
2891 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2892 wake_up(&mddev->sb_wait);
2896 set_disk_ro(mddev->gendisk, 0);
2897 err = do_md_run(mddev);
2902 /* these cannot be set */
2908 sysfs_notify_dirent(mddev->sysfs_state);
2912 static struct md_sysfs_entry md_array_state =
2913 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2916 null_show(mddev_t *mddev, char *page)
2922 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2924 /* buf must be %d:%d\n? giving major and minor numbers */
2925 /* The new device is added to the array.
2926 * If the array has a persistent superblock, we read the
2927 * superblock to initialise info and check validity.
2928 * Otherwise, only checking done is that in bind_rdev_to_array,
2929 * which mainly checks size.
2932 int major = simple_strtoul(buf, &e, 10);
2938 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2940 minor = simple_strtoul(e+1, &e, 10);
2941 if (*e && *e != '\n')
2943 dev = MKDEV(major, minor);
2944 if (major != MAJOR(dev) ||
2945 minor != MINOR(dev))
2949 if (mddev->persistent) {
2950 rdev = md_import_device(dev, mddev->major_version,
2951 mddev->minor_version);
2952 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2953 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2954 mdk_rdev_t, same_set);
2955 err = super_types[mddev->major_version]
2956 .load_super(rdev, rdev0, mddev->minor_version);
2960 } else if (mddev->external)
2961 rdev = md_import_device(dev, -2, -1);
2963 rdev = md_import_device(dev, -1, -1);
2966 return PTR_ERR(rdev);
2967 err = bind_rdev_to_array(rdev, mddev);
2971 return err ? err : len;
2974 static struct md_sysfs_entry md_new_device =
2975 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2978 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2981 unsigned long chunk, end_chunk;
2985 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2987 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2988 if (buf == end) break;
2989 if (*end == '-') { /* range */
2991 end_chunk = simple_strtoul(buf, &end, 0);
2992 if (buf == end) break;
2994 if (*end && !isspace(*end)) break;
2995 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2997 while (isspace(*buf)) buf++;
2999 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3004 static struct md_sysfs_entry md_bitmap =
3005 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3008 size_show(mddev_t *mddev, char *page)
3010 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
3013 static int update_size(mddev_t *mddev, sector_t num_sectors);
3016 size_store(mddev_t *mddev, const char *buf, size_t len)
3018 /* If array is inactive, we can reduce the component size, but
3019 * not increase it (except from 0).
3020 * If array is active, we can try an on-line resize
3024 unsigned long long size = simple_strtoull(buf, &e, 10);
3025 if (!*buf || *buf == '\n' ||
3030 err = update_size(mddev, size * 2);
3031 md_update_sb(mddev, 1);
3033 if (mddev->size == 0 ||
3039 return err ? err : len;
3042 static struct md_sysfs_entry md_size =
3043 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3048 * 'none' for arrays with no metadata (good luck...)
3049 * 'external' for arrays with externally managed metadata,
3050 * or N.M for internally known formats
3053 metadata_show(mddev_t *mddev, char *page)
3055 if (mddev->persistent)
3056 return sprintf(page, "%d.%d\n",
3057 mddev->major_version, mddev->minor_version);
3058 else if (mddev->external)
3059 return sprintf(page, "external:%s\n", mddev->metadata_type);
3061 return sprintf(page, "none\n");
3065 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3069 /* Changing the details of 'external' metadata is
3070 * always permitted. Otherwise there must be
3071 * no devices attached to the array.
3073 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3075 else if (!list_empty(&mddev->disks))
3078 if (cmd_match(buf, "none")) {
3079 mddev->persistent = 0;
3080 mddev->external = 0;
3081 mddev->major_version = 0;
3082 mddev->minor_version = 90;
3085 if (strncmp(buf, "external:", 9) == 0) {
3086 size_t namelen = len-9;
3087 if (namelen >= sizeof(mddev->metadata_type))
3088 namelen = sizeof(mddev->metadata_type)-1;
3089 strncpy(mddev->metadata_type, buf+9, namelen);
3090 mddev->metadata_type[namelen] = 0;
3091 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3092 mddev->metadata_type[--namelen] = 0;
3093 mddev->persistent = 0;
3094 mddev->external = 1;
3095 mddev->major_version = 0;
3096 mddev->minor_version = 90;
3099 major = simple_strtoul(buf, &e, 10);
3100 if (e==buf || *e != '.')
3103 minor = simple_strtoul(buf, &e, 10);
3104 if (e==buf || (*e && *e != '\n') )
3106 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3108 mddev->major_version = major;
3109 mddev->minor_version = minor;
3110 mddev->persistent = 1;
3111 mddev->external = 0;
3115 static struct md_sysfs_entry md_metadata =
3116 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3119 action_show(mddev_t *mddev, char *page)
3121 char *type = "idle";
3122 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3123 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3124 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3126 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3127 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3129 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3133 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3136 return sprintf(page, "%s\n", type);
3140 action_store(mddev_t *mddev, const char *page, size_t len)
3142 if (!mddev->pers || !mddev->pers->sync_request)
3145 if (cmd_match(page, "idle")) {
3146 if (mddev->sync_thread) {
3147 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3148 md_unregister_thread(mddev->sync_thread);
3149 mddev->sync_thread = NULL;
3150 mddev->recovery = 0;
3152 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3153 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3155 else if (cmd_match(page, "resync"))
3156 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3157 else if (cmd_match(page, "recover")) {
3158 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3159 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3160 } else if (cmd_match(page, "reshape")) {
3162 if (mddev->pers->start_reshape == NULL)
3164 err = mddev->pers->start_reshape(mddev);
3167 sysfs_notify(&mddev->kobj, NULL, "degraded");
3169 if (cmd_match(page, "check"))
3170 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3171 else if (!cmd_match(page, "repair"))
3173 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3174 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3176 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3177 md_wakeup_thread(mddev->thread);
3178 sysfs_notify_dirent(mddev->sysfs_action);
3183 mismatch_cnt_show(mddev_t *mddev, char *page)
3185 return sprintf(page, "%llu\n",
3186 (unsigned long long) mddev->resync_mismatches);
3189 static struct md_sysfs_entry md_scan_mode =
3190 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3193 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3196 sync_min_show(mddev_t *mddev, char *page)
3198 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3199 mddev->sync_speed_min ? "local": "system");
3203 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3207 if (strncmp(buf, "system", 6)==0) {
3208 mddev->sync_speed_min = 0;
3211 min = simple_strtoul(buf, &e, 10);
3212 if (buf == e || (*e && *e != '\n') || min <= 0)
3214 mddev->sync_speed_min = min;
3218 static struct md_sysfs_entry md_sync_min =
3219 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3222 sync_max_show(mddev_t *mddev, char *page)
3224 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3225 mddev->sync_speed_max ? "local": "system");
3229 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3233 if (strncmp(buf, "system", 6)==0) {
3234 mddev->sync_speed_max = 0;
3237 max = simple_strtoul(buf, &e, 10);
3238 if (buf == e || (*e && *e != '\n') || max <= 0)
3240 mddev->sync_speed_max = max;
3244 static struct md_sysfs_entry md_sync_max =
3245 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3248 degraded_show(mddev_t *mddev, char *page)
3250 return sprintf(page, "%d\n", mddev->degraded);
3252 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3255 sync_force_parallel_show(mddev_t *mddev, char *page)
3257 return sprintf(page, "%d\n", mddev->parallel_resync);
3261 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3265 if (strict_strtol(buf, 10, &n))
3268 if (n != 0 && n != 1)
3271 mddev->parallel_resync = n;
3273 if (mddev->sync_thread)
3274 wake_up(&resync_wait);
3279 /* force parallel resync, even with shared block devices */
3280 static struct md_sysfs_entry md_sync_force_parallel =
3281 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3282 sync_force_parallel_show, sync_force_parallel_store);
3285 sync_speed_show(mddev_t *mddev, char *page)
3287 unsigned long resync, dt, db;
3288 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3289 dt = (jiffies - mddev->resync_mark) / HZ;
3291 db = resync - mddev->resync_mark_cnt;
3292 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3295 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3298 sync_completed_show(mddev_t *mddev, char *page)
3300 unsigned long max_blocks, resync;
3302 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3303 max_blocks = mddev->resync_max_sectors;
3305 max_blocks = mddev->size << 1;
3307 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3308 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3311 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3314 min_sync_show(mddev_t *mddev, char *page)
3316 return sprintf(page, "%llu\n",
3317 (unsigned long long)mddev->resync_min);
3320 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3322 unsigned long long min;
3323 if (strict_strtoull(buf, 10, &min))
3325 if (min > mddev->resync_max)
3327 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3330 /* Must be a multiple of chunk_size */
3331 if (mddev->chunk_size) {
3332 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3335 mddev->resync_min = min;
3340 static struct md_sysfs_entry md_min_sync =
3341 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3344 max_sync_show(mddev_t *mddev, char *page)
3346 if (mddev->resync_max == MaxSector)
3347 return sprintf(page, "max\n");
3349 return sprintf(page, "%llu\n",
3350 (unsigned long long)mddev->resync_max);
3353 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3355 if (strncmp(buf, "max", 3) == 0)
3356 mddev->resync_max = MaxSector;
3358 unsigned long long max;
3359 if (strict_strtoull(buf, 10, &max))
3361 if (max < mddev->resync_min)
3363 if (max < mddev->resync_max &&
3364 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3367 /* Must be a multiple of chunk_size */
3368 if (mddev->chunk_size) {
3369 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3372 mddev->resync_max = max;
3374 wake_up(&mddev->recovery_wait);
3378 static struct md_sysfs_entry md_max_sync =
3379 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3382 suspend_lo_show(mddev_t *mddev, char *page)
3384 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3388 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3391 unsigned long long new = simple_strtoull(buf, &e, 10);
3393 if (mddev->pers->quiesce == NULL)
3395 if (buf == e || (*e && *e != '\n'))
3397 if (new >= mddev->suspend_hi ||
3398 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3399 mddev->suspend_lo = new;
3400 mddev->pers->quiesce(mddev, 2);
3405 static struct md_sysfs_entry md_suspend_lo =
3406 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3410 suspend_hi_show(mddev_t *mddev, char *page)
3412 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3416 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3419 unsigned long long new = simple_strtoull(buf, &e, 10);
3421 if (mddev->pers->quiesce == NULL)
3423 if (buf == e || (*e && *e != '\n'))
3425 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3426 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3427 mddev->suspend_hi = new;
3428 mddev->pers->quiesce(mddev, 1);
3429 mddev->pers->quiesce(mddev, 0);
3434 static struct md_sysfs_entry md_suspend_hi =
3435 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3438 reshape_position_show(mddev_t *mddev, char *page)
3440 if (mddev->reshape_position != MaxSector)
3441 return sprintf(page, "%llu\n",
3442 (unsigned long long)mddev->reshape_position);
3443 strcpy(page, "none\n");
3448 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3451 unsigned long long new = simple_strtoull(buf, &e, 10);
3454 if (buf == e || (*e && *e != '\n'))
3456 mddev->reshape_position = new;
3457 mddev->delta_disks = 0;
3458 mddev->new_level = mddev->level;
3459 mddev->new_layout = mddev->layout;
3460 mddev->new_chunk = mddev->chunk_size;
3464 static struct md_sysfs_entry md_reshape_position =
3465 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3466 reshape_position_store);
3469 static struct attribute *md_default_attrs[] = {
3472 &md_raid_disks.attr,
3473 &md_chunk_size.attr,
3475 &md_resync_start.attr,
3477 &md_new_device.attr,
3478 &md_safe_delay.attr,
3479 &md_array_state.attr,
3480 &md_reshape_position.attr,
3484 static struct attribute *md_redundancy_attrs[] = {
3486 &md_mismatches.attr,
3489 &md_sync_speed.attr,
3490 &md_sync_force_parallel.attr,
3491 &md_sync_completed.attr,
3494 &md_suspend_lo.attr,
3495 &md_suspend_hi.attr,
3500 static struct attribute_group md_redundancy_group = {
3502 .attrs = md_redundancy_attrs,
3507 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3509 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3510 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3515 rv = mddev_lock(mddev);
3517 rv = entry->show(mddev, page);
3518 mddev_unlock(mddev);
3524 md_attr_store(struct kobject *kobj, struct attribute *attr,
3525 const char *page, size_t length)
3527 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3528 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3533 if (!capable(CAP_SYS_ADMIN))
3535 rv = mddev_lock(mddev);
3536 if (mddev->hold_active == UNTIL_IOCTL)
3537 mddev->hold_active = 0;
3539 rv = entry->store(mddev, page, length);
3540 mddev_unlock(mddev);
3545 static void md_free(struct kobject *ko)
3547 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3549 if (mddev->sysfs_state)
3550 sysfs_put(mddev->sysfs_state);
3552 if (mddev->gendisk) {
3553 del_gendisk(mddev->gendisk);
3554 put_disk(mddev->gendisk);
3557 blk_cleanup_queue(mddev->queue);
3562 static struct sysfs_ops md_sysfs_ops = {
3563 .show = md_attr_show,
3564 .store = md_attr_store,
3566 static struct kobj_type md_ktype = {
3568 .sysfs_ops = &md_sysfs_ops,
3569 .default_attrs = md_default_attrs,
3574 static int md_alloc(dev_t dev, char *name)
3576 static DEFINE_MUTEX(disks_mutex);
3577 mddev_t *mddev = mddev_find(dev);
3578 struct gendisk *disk;
3587 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3588 shift = partitioned ? MdpMinorShift : 0;
3589 unit = MINOR(mddev->unit) >> shift;
3591 /* wait for any previous instance if this device
3592 * to be completed removed (mddev_delayed_delete).
3594 flush_scheduled_work();
3596 mutex_lock(&disks_mutex);
3597 if (mddev->gendisk) {
3598 mutex_unlock(&disks_mutex);
3604 /* Need to ensure that 'name' is not a duplicate.
3607 spin_lock(&all_mddevs_lock);
3609 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3610 if (mddev2->gendisk &&
3611 strcmp(mddev2->gendisk->disk_name, name) == 0) {
3612 spin_unlock(&all_mddevs_lock);
3615 spin_unlock(&all_mddevs_lock);
3618 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3619 if (!mddev->queue) {
3620 mutex_unlock(&disks_mutex);
3624 /* Can be unlocked because the queue is new: no concurrency */
3625 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3627 blk_queue_make_request(mddev->queue, md_fail_request);
3629 disk = alloc_disk(1 << shift);
3631 mutex_unlock(&disks_mutex);
3632 blk_cleanup_queue(mddev->queue);
3633 mddev->queue = NULL;
3637 disk->major = MAJOR(mddev->unit);
3638 disk->first_minor = unit << shift;
3640 strcpy(disk->disk_name, name);
3641 else if (partitioned)
3642 sprintf(disk->disk_name, "md_d%d", unit);
3644 sprintf(disk->disk_name, "md%d", unit);
3645 disk->fops = &md_fops;
3646 disk->private_data = mddev;
3647 disk->queue = mddev->queue;
3648 /* Allow extended partitions. This makes the
3649 * 'mdp' device redundant, but we can't really
3652 disk->flags |= GENHD_FL_EXT_DEVT;
3654 mddev->gendisk = disk;
3655 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3656 &disk_to_dev(disk)->kobj, "%s", "md");
3657 mutex_unlock(&disks_mutex);
3659 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3662 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3663 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3669 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3671 md_alloc(dev, NULL);
3675 static int add_named_array(const char *val, struct kernel_param *kp)
3677 /* val must be "md_*" where * is not all digits.
3678 * We allocate an array with a large free minor number, and
3679 * set the name to val. val must not already be an active name.
3681 int len = strlen(val);
3682 char buf[DISK_NAME_LEN];
3684 while (len && val[len-1] == '\n')
3686 if (len >= DISK_NAME_LEN)
3688 strlcpy(buf, val, len+1);
3689 if (strncmp(buf, "md_", 3) != 0)
3691 return md_alloc(0, buf);
3694 static void md_safemode_timeout(unsigned long data)
3696 mddev_t *mddev = (mddev_t *) data;
3698 if (!atomic_read(&mddev->writes_pending)) {
3699 mddev->safemode = 1;
3700 if (mddev->external)
3701 sysfs_notify_dirent(mddev->sysfs_state);
3703 md_wakeup_thread(mddev->thread);
3706 static int start_dirty_degraded;
3708 static int do_md_run(mddev_t * mddev)
3713 struct gendisk *disk;
3714 struct mdk_personality *pers;
3715 char b[BDEVNAME_SIZE];
3717 if (list_empty(&mddev->disks))
3718 /* cannot run an array with no devices.. */
3725 * Analyze all RAID superblock(s)
3727 if (!mddev->raid_disks) {
3728 if (!mddev->persistent)
3733 chunk_size = mddev->chunk_size;
3736 if (chunk_size > MAX_CHUNK_SIZE) {
3737 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3738 chunk_size, MAX_CHUNK_SIZE);
3742 * chunk-size has to be a power of 2
3744 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3745 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3749 /* devices must have minimum size of one chunk */
3750 list_for_each_entry(rdev, &mddev->disks, same_set) {
3751 if (test_bit(Faulty, &rdev->flags))
3753 if (rdev->size < chunk_size / 1024) {
3755 "md: Dev %s smaller than chunk_size:"
3757 bdevname(rdev->bdev,b),
3758 (unsigned long long)rdev->size,
3765 if (mddev->level != LEVEL_NONE)
3766 request_module("md-level-%d", mddev->level);
3767 else if (mddev->clevel[0])
3768 request_module("md-%s", mddev->clevel);
3771 * Drop all container device buffers, from now on
3772 * the only valid external interface is through the md
3775 list_for_each_entry(rdev, &mddev->disks, same_set) {
3776 if (test_bit(Faulty, &rdev->flags))
3778 sync_blockdev(rdev->bdev);
3779 invalidate_bdev(rdev->bdev);
3781 /* perform some consistency tests on the device.
3782 * We don't want the data to overlap the metadata,
3783 * Internal Bitmap issues has handled elsewhere.
3785 if (rdev->data_offset < rdev->sb_start) {
3787 rdev->data_offset + mddev->size*2
3789 printk("md: %s: data overlaps metadata\n",
3794 if (rdev->sb_start + rdev->sb_size/512
3795 > rdev->data_offset) {
3796 printk("md: %s: metadata overlaps data\n",
3801 sysfs_notify_dirent(rdev->sysfs_state);
3804 md_probe(mddev->unit, NULL, NULL);
3805 disk = mddev->gendisk;
3809 spin_lock(&pers_lock);
3810 pers = find_pers(mddev->level, mddev->clevel);
3811 if (!pers || !try_module_get(pers->owner)) {
3812 spin_unlock(&pers_lock);
3813 if (mddev->level != LEVEL_NONE)
3814 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3817 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3822 spin_unlock(&pers_lock);
3823 mddev->level = pers->level;
3824 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3826 if (pers->level >= 4 && pers->level <= 6)
3827 /* Cannot support integrity (yet) */
3828 blk_integrity_unregister(mddev->gendisk);
3830 if (mddev->reshape_position != MaxSector &&
3831 pers->start_reshape == NULL) {
3832 /* This personality cannot handle reshaping... */
3834 module_put(pers->owner);
3838 if (pers->sync_request) {
3839 /* Warn if this is a potentially silly
3842 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3846 list_for_each_entry(rdev, &mddev->disks, same_set)
3847 list_for_each_entry(rdev2, &mddev->disks, same_set) {
3849 rdev->bdev->bd_contains ==
3850 rdev2->bdev->bd_contains) {
3852 "%s: WARNING: %s appears to be"
3853 " on the same physical disk as"
3856 bdevname(rdev->bdev,b),
3857 bdevname(rdev2->bdev,b2));
3864 "True protection against single-disk"
3865 " failure might be compromised.\n");
3868 mddev->recovery = 0;
3869 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3870 mddev->barriers_work = 1;
3871 mddev->ok_start_degraded = start_dirty_degraded;
3874 mddev->ro = 2; /* read-only, but switch on first write */
3876 err = mddev->pers->run(mddev);
3878 printk(KERN_ERR "md: pers->run() failed ...\n");
3879 else if (mddev->pers->sync_request) {
3880 err = bitmap_create(mddev);
3882 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3883 mdname(mddev), err);
3884 mddev->pers->stop(mddev);
3888 module_put(mddev->pers->owner);
3890 bitmap_destroy(mddev);
3893 if (mddev->pers->sync_request) {
3894 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3896 "md: cannot register extra attributes for %s\n",
3898 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3899 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3902 atomic_set(&mddev->writes_pending,0);
3903 mddev->safemode = 0;
3904 mddev->safemode_timer.function = md_safemode_timeout;
3905 mddev->safemode_timer.data = (unsigned long) mddev;
3906 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3909 list_for_each_entry(rdev, &mddev->disks, same_set)
3910 if (rdev->raid_disk >= 0) {
3912 sprintf(nm, "rd%d", rdev->raid_disk);
3913 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3914 printk("md: cannot register %s for %s\n",
3918 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3921 md_update_sb(mddev, 0);
3923 set_capacity(disk, mddev->array_sectors);
3925 /* If we call blk_queue_make_request here, it will
3926 * re-initialise max_sectors etc which may have been
3927 * refined inside -> run. So just set the bits we need to set.
3928 * Most initialisation happended when we called
3929 * blk_queue_make_request(..., md_fail_request)
3932 mddev->queue->queuedata = mddev;
3933 mddev->queue->make_request_fn = mddev->pers->make_request;
3935 /* If there is a partially-recovered drive we need to
3936 * start recovery here. If we leave it to md_check_recovery,
3937 * it will remove the drives and not do the right thing
3939 if (mddev->degraded && !mddev->sync_thread) {
3941 list_for_each_entry(rdev, &mddev->disks, same_set)
3942 if (rdev->raid_disk >= 0 &&
3943 !test_bit(In_sync, &rdev->flags) &&
3944 !test_bit(Faulty, &rdev->flags))
3945 /* complete an interrupted recovery */
3947 if (spares && mddev->pers->sync_request) {
3948 mddev->recovery = 0;
3949 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3950 mddev->sync_thread = md_register_thread(md_do_sync,
3953 if (!mddev->sync_thread) {
3954 printk(KERN_ERR "%s: could not start resync"
3957 /* leave the spares where they are, it shouldn't hurt */
3958 mddev->recovery = 0;
3962 md_wakeup_thread(mddev->thread);
3963 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3966 md_new_event(mddev);
3967 sysfs_notify_dirent(mddev->sysfs_state);
3968 if (mddev->sysfs_action)
3969 sysfs_notify_dirent(mddev->sysfs_action);
3970 sysfs_notify(&mddev->kobj, NULL, "degraded");
3971 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3975 static int restart_array(mddev_t *mddev)
3977 struct gendisk *disk = mddev->gendisk;
3979 /* Complain if it has no devices */
3980 if (list_empty(&mddev->disks))
3986 mddev->safemode = 0;
3988 set_disk_ro(disk, 0);
3989 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3991 /* Kick recovery or resync if necessary */
3992 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3993 md_wakeup_thread(mddev->thread);
3994 md_wakeup_thread(mddev->sync_thread);
3995 sysfs_notify_dirent(mddev->sysfs_state);
3999 /* similar to deny_write_access, but accounts for our holding a reference
4000 * to the file ourselves */
4001 static int deny_bitmap_write_access(struct file * file)
4003 struct inode *inode = file->f_mapping->host;
4005 spin_lock(&inode->i_lock);
4006 if (atomic_read(&inode->i_writecount) > 1) {
4007 spin_unlock(&inode->i_lock);
4010 atomic_set(&inode->i_writecount, -1);
4011 spin_unlock(&inode->i_lock);
4016 static void restore_bitmap_write_access(struct file *file)
4018 struct inode *inode = file->f_mapping->host;
4020 spin_lock(&inode->i_lock);
4021 atomic_set(&inode->i_writecount, 1);
4022 spin_unlock(&inode->i_lock);
4026 * 0 - completely stop and dis-assemble array
4027 * 1 - switch to readonly
4028 * 2 - stop but do not disassemble array
4030 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4033 struct gendisk *disk = mddev->gendisk;
4035 if (atomic_read(&mddev->openers) > is_open) {
4036 printk("md: %s still in use.\n",mdname(mddev));
4042 if (mddev->sync_thread) {
4043 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4044 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4045 md_unregister_thread(mddev->sync_thread);
4046 mddev->sync_thread = NULL;
4049 del_timer_sync(&mddev->safemode_timer);
4052 case 1: /* readonly */
4058 case 0: /* disassemble */
4060 bitmap_flush(mddev);
4061 md_super_wait(mddev);
4063 set_disk_ro(disk, 0);
4064 blk_queue_make_request(mddev->queue, md_fail_request);
4065 mddev->pers->stop(mddev);
4066 mddev->queue->merge_bvec_fn = NULL;
4067 mddev->queue->unplug_fn = NULL;
4068 mddev->queue->backing_dev_info.congested_fn = NULL;
4069 if (mddev->pers->sync_request) {
4070 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
4071 if (mddev->sysfs_action)
4072 sysfs_put(mddev->sysfs_action);
4073 mddev->sysfs_action = NULL;
4075 module_put(mddev->pers->owner);
4077 /* tell userspace to handle 'inactive' */
4078 sysfs_notify_dirent(mddev->sysfs_state);
4080 set_capacity(disk, 0);
4086 if (!mddev->in_sync || mddev->flags) {
4087 /* mark array as shutdown cleanly */
4089 md_update_sb(mddev, 1);
4092 set_disk_ro(disk, 1);
4093 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4097 * Free resources if final stop
4102 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4104 bitmap_destroy(mddev);
4105 if (mddev->bitmap_file) {
4106 restore_bitmap_write_access(mddev->bitmap_file);
4107 fput(mddev->bitmap_file);
4108 mddev->bitmap_file = NULL;
4110 mddev->bitmap_offset = 0;
4112 list_for_each_entry(rdev, &mddev->disks, same_set)
4113 if (rdev->raid_disk >= 0) {
4115 sprintf(nm, "rd%d", rdev->raid_disk);
4116 sysfs_remove_link(&mddev->kobj, nm);
4119 /* make sure all md_delayed_delete calls have finished */
4120 flush_scheduled_work();
4122 export_array(mddev);
4124 mddev->array_sectors = 0;
4126 mddev->raid_disks = 0;
4127 mddev->recovery_cp = 0;
4128 mddev->resync_min = 0;
4129 mddev->resync_max = MaxSector;
4130 mddev->reshape_position = MaxSector;
4131 mddev->external = 0;
4132 mddev->persistent = 0;
4133 mddev->level = LEVEL_NONE;
4134 mddev->clevel[0] = 0;
4137 mddev->metadata_type[0] = 0;
4138 mddev->chunk_size = 0;
4139 mddev->ctime = mddev->utime = 0;
4141 mddev->max_disks = 0;
4143 mddev->delta_disks = 0;
4144 mddev->new_level = LEVEL_NONE;
4145 mddev->new_layout = 0;
4146 mddev->new_chunk = 0;
4147 mddev->curr_resync = 0;
4148 mddev->resync_mismatches = 0;
4149 mddev->suspend_lo = mddev->suspend_hi = 0;
4150 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4151 mddev->recovery = 0;
4154 mddev->degraded = 0;
4155 mddev->barriers_work = 0;
4156 mddev->safemode = 0;
4157 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4158 if (mddev->hold_active == UNTIL_STOP)
4159 mddev->hold_active = 0;
4161 } else if (mddev->pers)
4162 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4165 blk_integrity_unregister(disk);
4166 md_new_event(mddev);
4167 sysfs_notify_dirent(mddev->sysfs_state);
4173 static void autorun_array(mddev_t *mddev)
4178 if (list_empty(&mddev->disks))
4181 printk(KERN_INFO "md: running: ");
4183 list_for_each_entry(rdev, &mddev->disks, same_set) {
4184 char b[BDEVNAME_SIZE];
4185 printk("<%s>", bdevname(rdev->bdev,b));
4189 err = do_md_run(mddev);
4191 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4192 do_md_stop(mddev, 0, 0);
4197 * lets try to run arrays based on all disks that have arrived
4198 * until now. (those are in pending_raid_disks)
4200 * the method: pick the first pending disk, collect all disks with
4201 * the same UUID, remove all from the pending list and put them into
4202 * the 'same_array' list. Then order this list based on superblock
4203 * update time (freshest comes first), kick out 'old' disks and
4204 * compare superblocks. If everything's fine then run it.
4206 * If "unit" is allocated, then bump its reference count
4208 static void autorun_devices(int part)
4210 mdk_rdev_t *rdev0, *rdev, *tmp;
4212 char b[BDEVNAME_SIZE];
4214 printk(KERN_INFO "md: autorun ...\n");
4215 while (!list_empty(&pending_raid_disks)) {
4218 LIST_HEAD(candidates);
4219 rdev0 = list_entry(pending_raid_disks.next,
4220 mdk_rdev_t, same_set);
4222 printk(KERN_INFO "md: considering %s ...\n",
4223 bdevname(rdev0->bdev,b));
4224 INIT_LIST_HEAD(&candidates);
4225 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4226 if (super_90_load(rdev, rdev0, 0) >= 0) {
4227 printk(KERN_INFO "md: adding %s ...\n",
4228 bdevname(rdev->bdev,b));
4229 list_move(&rdev->same_set, &candidates);
4232 * now we have a set of devices, with all of them having
4233 * mostly sane superblocks. It's time to allocate the
4237 dev = MKDEV(mdp_major,
4238 rdev0->preferred_minor << MdpMinorShift);
4239 unit = MINOR(dev) >> MdpMinorShift;
4241 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4244 if (rdev0->preferred_minor != unit) {
4245 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4246 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4250 md_probe(dev, NULL, NULL);
4251 mddev = mddev_find(dev);
4252 if (!mddev || !mddev->gendisk) {
4256 "md: cannot allocate memory for md drive.\n");
4259 if (mddev_lock(mddev))
4260 printk(KERN_WARNING "md: %s locked, cannot run\n",
4262 else if (mddev->raid_disks || mddev->major_version
4263 || !list_empty(&mddev->disks)) {
4265 "md: %s already running, cannot run %s\n",
4266 mdname(mddev), bdevname(rdev0->bdev,b));
4267 mddev_unlock(mddev);
4269 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4270 mddev->persistent = 1;
4271 rdev_for_each_list(rdev, tmp, &candidates) {
4272 list_del_init(&rdev->same_set);
4273 if (bind_rdev_to_array(rdev, mddev))
4276 autorun_array(mddev);
4277 mddev_unlock(mddev);
4279 /* on success, candidates will be empty, on error
4282 rdev_for_each_list(rdev, tmp, &candidates) {
4283 list_del_init(&rdev->same_set);
4288 printk(KERN_INFO "md: ... autorun DONE.\n");
4290 #endif /* !MODULE */
4292 static int get_version(void __user * arg)
4296 ver.major = MD_MAJOR_VERSION;
4297 ver.minor = MD_MINOR_VERSION;
4298 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4300 if (copy_to_user(arg, &ver, sizeof(ver)))
4306 static int get_array_info(mddev_t * mddev, void __user * arg)
4308 mdu_array_info_t info;
4309 int nr,working,active,failed,spare;
4312 nr=working=active=failed=spare=0;
4313 list_for_each_entry(rdev, &mddev->disks, same_set) {
4315 if (test_bit(Faulty, &rdev->flags))
4319 if (test_bit(In_sync, &rdev->flags))
4326 info.major_version = mddev->major_version;
4327 info.minor_version = mddev->minor_version;
4328 info.patch_version = MD_PATCHLEVEL_VERSION;
4329 info.ctime = mddev->ctime;
4330 info.level = mddev->level;
4331 info.size = mddev->size;
4332 if (info.size != mddev->size) /* overflow */
4335 info.raid_disks = mddev->raid_disks;
4336 info.md_minor = mddev->md_minor;
4337 info.not_persistent= !mddev->persistent;
4339 info.utime = mddev->utime;
4342 info.state = (1<<MD_SB_CLEAN);
4343 if (mddev->bitmap && mddev->bitmap_offset)
4344 info.state = (1<<MD_SB_BITMAP_PRESENT);
4345 info.active_disks = active;
4346 info.working_disks = working;
4347 info.failed_disks = failed;
4348 info.spare_disks = spare;
4350 info.layout = mddev->layout;
4351 info.chunk_size = mddev->chunk_size;
4353 if (copy_to_user(arg, &info, sizeof(info)))
4359 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4361 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4362 char *ptr, *buf = NULL;
4365 if (md_allow_write(mddev))
4366 file = kmalloc(sizeof(*file), GFP_NOIO);
4368 file = kmalloc(sizeof(*file), GFP_KERNEL);
4373 /* bitmap disabled, zero the first byte and copy out */
4374 if (!mddev->bitmap || !mddev->bitmap->file) {
4375 file->pathname[0] = '\0';
4379 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4383 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4387 strcpy(file->pathname, ptr);
4391 if (copy_to_user(arg, file, sizeof(*file)))
4399 static int get_disk_info(mddev_t * mddev, void __user * arg)
4401 mdu_disk_info_t info;
4404 if (copy_from_user(&info, arg, sizeof(info)))
4407 rdev = find_rdev_nr(mddev, info.number);
4409 info.major = MAJOR(rdev->bdev->bd_dev);
4410 info.minor = MINOR(rdev->bdev->bd_dev);
4411 info.raid_disk = rdev->raid_disk;
4413 if (test_bit(Faulty, &rdev->flags))
4414 info.state |= (1<<MD_DISK_FAULTY);
4415 else if (test_bit(In_sync, &rdev->flags)) {
4416 info.state |= (1<<MD_DISK_ACTIVE);
4417 info.state |= (1<<MD_DISK_SYNC);
4419 if (test_bit(WriteMostly, &rdev->flags))
4420 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4422 info.major = info.minor = 0;
4423 info.raid_disk = -1;
4424 info.state = (1<<MD_DISK_REMOVED);
4427 if (copy_to_user(arg, &info, sizeof(info)))
4433 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4435 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4437 dev_t dev = MKDEV(info->major,info->minor);
4439 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4442 if (!mddev->raid_disks) {
4444 /* expecting a device which has a superblock */
4445 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4448 "md: md_import_device returned %ld\n",
4450 return PTR_ERR(rdev);
4452 if (!list_empty(&mddev->disks)) {
4453 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4454 mdk_rdev_t, same_set);
4455 int err = super_types[mddev->major_version]
4456 .load_super(rdev, rdev0, mddev->minor_version);
4459 "md: %s has different UUID to %s\n",
4460 bdevname(rdev->bdev,b),
4461 bdevname(rdev0->bdev,b2));
4466 err = bind_rdev_to_array(rdev, mddev);
4473 * add_new_disk can be used once the array is assembled
4474 * to add "hot spares". They must already have a superblock
4479 if (!mddev->pers->hot_add_disk) {
4481 "%s: personality does not support diskops!\n",
4485 if (mddev->persistent)
4486 rdev = md_import_device(dev, mddev->major_version,
4487 mddev->minor_version);
4489 rdev = md_import_device(dev, -1, -1);
4492 "md: md_import_device returned %ld\n",
4494 return PTR_ERR(rdev);
4496 /* set save_raid_disk if appropriate */
4497 if (!mddev->persistent) {
4498 if (info->state & (1<<MD_DISK_SYNC) &&
4499 info->raid_disk < mddev->raid_disks)
4500 rdev->raid_disk = info->raid_disk;
4502 rdev->raid_disk = -1;
4504 super_types[mddev->major_version].
4505 validate_super(mddev, rdev);
4506 rdev->saved_raid_disk = rdev->raid_disk;
4508 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4509 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4510 set_bit(WriteMostly, &rdev->flags);
4512 rdev->raid_disk = -1;
4513 err = bind_rdev_to_array(rdev, mddev);
4514 if (!err && !mddev->pers->hot_remove_disk) {
4515 /* If there is hot_add_disk but no hot_remove_disk
4516 * then added disks for geometry changes,
4517 * and should be added immediately.
4519 super_types[mddev->major_version].
4520 validate_super(mddev, rdev);
4521 err = mddev->pers->hot_add_disk(mddev, rdev);
4523 unbind_rdev_from_array(rdev);
4528 sysfs_notify_dirent(rdev->sysfs_state);
4530 md_update_sb(mddev, 1);
4531 if (mddev->degraded)
4532 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4533 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4534 md_wakeup_thread(mddev->thread);
4538 /* otherwise, add_new_disk is only allowed
4539 * for major_version==0 superblocks
4541 if (mddev->major_version != 0) {
4542 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4547 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4549 rdev = md_import_device(dev, -1, 0);
4552 "md: error, md_import_device() returned %ld\n",
4554 return PTR_ERR(rdev);
4556 rdev->desc_nr = info->number;
4557 if (info->raid_disk < mddev->raid_disks)
4558 rdev->raid_disk = info->raid_disk;
4560 rdev->raid_disk = -1;
4562 if (rdev->raid_disk < mddev->raid_disks)
4563 if (info->state & (1<<MD_DISK_SYNC))
4564 set_bit(In_sync, &rdev->flags);
4566 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4567 set_bit(WriteMostly, &rdev->flags);
4569 if (!mddev->persistent) {
4570 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4571 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4573 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4574 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4576 err = bind_rdev_to_array(rdev, mddev);
4586 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4588 char b[BDEVNAME_SIZE];
4591 rdev = find_rdev(mddev, dev);
4595 if (rdev->raid_disk >= 0)
4598 kick_rdev_from_array(rdev);
4599 md_update_sb(mddev, 1);
4600 md_new_event(mddev);
4604 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4605 bdevname(rdev->bdev,b), mdname(mddev));
4609 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4611 char b[BDEVNAME_SIZE];
4618 if (mddev->major_version != 0) {
4619 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4620 " version-0 superblocks.\n",
4624 if (!mddev->pers->hot_add_disk) {
4626 "%s: personality does not support diskops!\n",
4631 rdev = md_import_device(dev, -1, 0);
4634 "md: error, md_import_device() returned %ld\n",
4639 if (mddev->persistent)
4640 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4642 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4644 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4646 if (test_bit(Faulty, &rdev->flags)) {
4648 "md: can not hot-add faulty %s disk to %s!\n",
4649 bdevname(rdev->bdev,b), mdname(mddev));
4653 clear_bit(In_sync, &rdev->flags);
4655 rdev->saved_raid_disk = -1;
4656 err = bind_rdev_to_array(rdev, mddev);
4661 * The rest should better be atomic, we can have disk failures
4662 * noticed in interrupt contexts ...
4665 rdev->raid_disk = -1;
4667 md_update_sb(mddev, 1);
4670 * Kick recovery, maybe this spare has to be added to the
4671 * array immediately.
4673 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4674 md_wakeup_thread(mddev->thread);
4675 md_new_event(mddev);
4683 static int set_bitmap_file(mddev_t *mddev, int fd)
4688 if (!mddev->pers->quiesce)
4690 if (mddev->recovery || mddev->sync_thread)
4692 /* we should be able to change the bitmap.. */
4698 return -EEXIST; /* cannot add when bitmap is present */
4699 mddev->bitmap_file = fget(fd);
4701 if (mddev->bitmap_file == NULL) {
4702 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4707 err = deny_bitmap_write_access(mddev->bitmap_file);
4709 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4711 fput(mddev->bitmap_file);
4712 mddev->bitmap_file = NULL;
4715 mddev->bitmap_offset = 0; /* file overrides offset */
4716 } else if (mddev->bitmap == NULL)
4717 return -ENOENT; /* cannot remove what isn't there */
4720 mddev->pers->quiesce(mddev, 1);
4722 err = bitmap_create(mddev);
4723 if (fd < 0 || err) {
4724 bitmap_destroy(mddev);
4725 fd = -1; /* make sure to put the file */
4727 mddev->pers->quiesce(mddev, 0);
4730 if (mddev->bitmap_file) {
4731 restore_bitmap_write_access(mddev->bitmap_file);
4732 fput(mddev->bitmap_file);
4734 mddev->bitmap_file = NULL;
4741 * set_array_info is used two different ways
4742 * The original usage is when creating a new array.
4743 * In this usage, raid_disks is > 0 and it together with
4744 * level, size, not_persistent,layout,chunksize determine the
4745 * shape of the array.
4746 * This will always create an array with a type-0.90.0 superblock.
4747 * The newer usage is when assembling an array.
4748 * In this case raid_disks will be 0, and the major_version field is
4749 * use to determine which style super-blocks are to be found on the devices.
4750 * The minor and patch _version numbers are also kept incase the
4751 * super_block handler wishes to interpret them.
4753 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4756 if (info->raid_disks == 0) {
4757 /* just setting version number for superblock loading */
4758 if (info->major_version < 0 ||
4759 info->major_version >= ARRAY_SIZE(super_types) ||
4760 super_types[info->major_version].name == NULL) {
4761 /* maybe try to auto-load a module? */
4763 "md: superblock version %d not known\n",
4764 info->major_version);
4767 mddev->major_version = info->major_version;
4768 mddev->minor_version = info->minor_version;
4769 mddev->patch_version = info->patch_version;
4770 mddev->persistent = !info->not_persistent;
4773 mddev->major_version = MD_MAJOR_VERSION;
4774 mddev->minor_version = MD_MINOR_VERSION;
4775 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4776 mddev->ctime = get_seconds();
4778 mddev->level = info->level;
4779 mddev->clevel[0] = 0;
4780 mddev->size = info->size;
4781 mddev->raid_disks = info->raid_disks;
4782 /* don't set md_minor, it is determined by which /dev/md* was
4785 if (info->state & (1<<MD_SB_CLEAN))
4786 mddev->recovery_cp = MaxSector;
4788 mddev->recovery_cp = 0;
4789 mddev->persistent = ! info->not_persistent;
4790 mddev->external = 0;
4792 mddev->layout = info->layout;
4793 mddev->chunk_size = info->chunk_size;
4795 mddev->max_disks = MD_SB_DISKS;
4797 if (mddev->persistent)
4799 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4801 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4802 mddev->bitmap_offset = 0;
4804 mddev->reshape_position = MaxSector;
4807 * Generate a 128 bit UUID
4809 get_random_bytes(mddev->uuid, 16);
4811 mddev->new_level = mddev->level;
4812 mddev->new_chunk = mddev->chunk_size;
4813 mddev->new_layout = mddev->layout;
4814 mddev->delta_disks = 0;
4819 static int update_size(mddev_t *mddev, sector_t num_sectors)
4823 int fit = (num_sectors == 0);
4825 if (mddev->pers->resize == NULL)
4827 /* The "num_sectors" is the number of sectors of each device that
4828 * is used. This can only make sense for arrays with redundancy.
4829 * linear and raid0 always use whatever space is available. We can only
4830 * consider changing this number if no resync or reconstruction is
4831 * happening, and if the new size is acceptable. It must fit before the
4832 * sb_start or, if that is <data_offset, it must fit before the size
4833 * of each device. If num_sectors is zero, we find the largest size
4837 if (mddev->sync_thread)
4840 /* Sorry, cannot grow a bitmap yet, just remove it,
4844 list_for_each_entry(rdev, &mddev->disks, same_set) {
4846 avail = rdev->size * 2;
4848 if (fit && (num_sectors == 0 || num_sectors > avail))
4849 num_sectors = avail;
4850 if (avail < num_sectors)
4853 rv = mddev->pers->resize(mddev, num_sectors);
4855 struct block_device *bdev;
4857 bdev = bdget_disk(mddev->gendisk, 0);
4859 mutex_lock(&bdev->bd_inode->i_mutex);
4860 i_size_write(bdev->bd_inode,
4861 (loff_t)mddev->array_sectors << 9);
4862 mutex_unlock(&bdev->bd_inode->i_mutex);
4869 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4872 /* change the number of raid disks */
4873 if (mddev->pers->check_reshape == NULL)
4875 if (raid_disks <= 0 ||
4876 raid_disks >= mddev->max_disks)
4878 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4880 mddev->delta_disks = raid_disks - mddev->raid_disks;
4882 rv = mddev->pers->check_reshape(mddev);
4888 * update_array_info is used to change the configuration of an
4890 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4891 * fields in the info are checked against the array.
4892 * Any differences that cannot be handled will cause an error.
4893 * Normally, only one change can be managed at a time.
4895 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4901 /* calculate expected state,ignoring low bits */
4902 if (mddev->bitmap && mddev->bitmap_offset)
4903 state |= (1 << MD_SB_BITMAP_PRESENT);
4905 if (mddev->major_version != info->major_version ||
4906 mddev->minor_version != info->minor_version ||
4907 /* mddev->patch_version != info->patch_version || */
4908 mddev->ctime != info->ctime ||
4909 mddev->level != info->level ||
4910 /* mddev->layout != info->layout || */
4911 !mddev->persistent != info->not_persistent||
4912 mddev->chunk_size != info->chunk_size ||
4913 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4914 ((state^info->state) & 0xfffffe00)
4917 /* Check there is only one change */
4918 if (info->size >= 0 && mddev->size != info->size) cnt++;
4919 if (mddev->raid_disks != info->raid_disks) cnt++;
4920 if (mddev->layout != info->layout) cnt++;
4921 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4922 if (cnt == 0) return 0;
4923 if (cnt > 1) return -EINVAL;
4925 if (mddev->layout != info->layout) {
4927 * we don't need to do anything at the md level, the
4928 * personality will take care of it all.
4930 if (mddev->pers->reconfig == NULL)
4933 return mddev->pers->reconfig(mddev, info->layout, -1);
4935 if (info->size >= 0 && mddev->size != info->size)
4936 rv = update_size(mddev, (sector_t)info->size * 2);
4938 if (mddev->raid_disks != info->raid_disks)
4939 rv = update_raid_disks(mddev, info->raid_disks);
4941 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4942 if (mddev->pers->quiesce == NULL)
4944 if (mddev->recovery || mddev->sync_thread)
4946 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4947 /* add the bitmap */
4950 if (mddev->default_bitmap_offset == 0)
4952 mddev->bitmap_offset = mddev->default_bitmap_offset;
4953 mddev->pers->quiesce(mddev, 1);
4954 rv = bitmap_create(mddev);
4956 bitmap_destroy(mddev);
4957 mddev->pers->quiesce(mddev, 0);
4959 /* remove the bitmap */
4962 if (mddev->bitmap->file)
4964 mddev->pers->quiesce(mddev, 1);
4965 bitmap_destroy(mddev);
4966 mddev->pers->quiesce(mddev, 0);
4967 mddev->bitmap_offset = 0;
4970 md_update_sb(mddev, 1);
4974 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4978 if (mddev->pers == NULL)
4981 rdev = find_rdev(mddev, dev);
4985 md_error(mddev, rdev);
4990 * We have a problem here : there is no easy way to give a CHS
4991 * virtual geometry. We currently pretend that we have a 2 heads
4992 * 4 sectors (with a BIG number of cylinders...). This drives
4993 * dosfs just mad... ;-)
4995 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4997 mddev_t *mddev = bdev->bd_disk->private_data;
5001 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5005 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5006 unsigned int cmd, unsigned long arg)
5009 void __user *argp = (void __user *)arg;
5010 mddev_t *mddev = NULL;
5012 if (!capable(CAP_SYS_ADMIN))
5016 * Commands dealing with the RAID driver but not any
5022 err = get_version(argp);
5025 case PRINT_RAID_DEBUG:
5033 autostart_arrays(arg);
5040 * Commands creating/starting a new array:
5043 mddev = bdev->bd_disk->private_data;
5050 err = mddev_lock(mddev);
5053 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5060 case SET_ARRAY_INFO:
5062 mdu_array_info_t info;
5064 memset(&info, 0, sizeof(info));
5065 else if (copy_from_user(&info, argp, sizeof(info))) {
5070 err = update_array_info(mddev, &info);
5072 printk(KERN_WARNING "md: couldn't update"
5073 " array info. %d\n", err);
5078 if (!list_empty(&mddev->disks)) {
5080 "md: array %s already has disks!\n",
5085 if (mddev->raid_disks) {
5087 "md: array %s already initialised!\n",
5092 err = set_array_info(mddev, &info);
5094 printk(KERN_WARNING "md: couldn't set"
5095 " array info. %d\n", err);
5105 * Commands querying/configuring an existing array:
5107 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5108 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5109 if ((!mddev->raid_disks && !mddev->external)
5110 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5111 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5112 && cmd != GET_BITMAP_FILE) {
5118 * Commands even a read-only array can execute:
5122 case GET_ARRAY_INFO:
5123 err = get_array_info(mddev, argp);
5126 case GET_BITMAP_FILE:
5127 err = get_bitmap_file(mddev, argp);
5131 err = get_disk_info(mddev, argp);
5134 case RESTART_ARRAY_RW:
5135 err = restart_array(mddev);
5139 err = do_md_stop(mddev, 0, 1);
5143 err = do_md_stop(mddev, 1, 1);
5149 * The remaining ioctls are changing the state of the
5150 * superblock, so we do not allow them on read-only arrays.
5151 * However non-MD ioctls (e.g. get-size) will still come through
5152 * here and hit the 'default' below, so only disallow
5153 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5155 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5156 if (mddev->ro == 2) {
5158 sysfs_notify_dirent(mddev->sysfs_state);
5159 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5160 md_wakeup_thread(mddev->thread);
5171 mdu_disk_info_t info;
5172 if (copy_from_user(&info, argp, sizeof(info)))
5175 err = add_new_disk(mddev, &info);
5179 case HOT_REMOVE_DISK:
5180 err = hot_remove_disk(mddev, new_decode_dev(arg));
5184 err = hot_add_disk(mddev, new_decode_dev(arg));
5187 case SET_DISK_FAULTY:
5188 err = set_disk_faulty(mddev, new_decode_dev(arg));
5192 err = do_md_run(mddev);
5195 case SET_BITMAP_FILE:
5196 err = set_bitmap_file(mddev, (int)arg);
5206 if (mddev->hold_active == UNTIL_IOCTL &&
5208 mddev->hold_active = 0;
5209 mddev_unlock(mddev);
5219 static int md_open(struct block_device *bdev, fmode_t mode)
5222 * Succeed if we can lock the mddev, which confirms that
5223 * it isn't being stopped right now.
5225 mddev_t *mddev = mddev_find(bdev->bd_dev);
5228 if (mddev->gendisk != bdev->bd_disk) {
5229 /* we are racing with mddev_put which is discarding this
5233 /* Wait until bdev->bd_disk is definitely gone */
5234 flush_scheduled_work();
5235 /* Then retry the open from the top */
5236 return -ERESTARTSYS;
5238 BUG_ON(mddev != bdev->bd_disk->private_data);
5240 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5244 atomic_inc(&mddev->openers);
5245 mddev_unlock(mddev);
5247 check_disk_change(bdev);
5252 static int md_release(struct gendisk *disk, fmode_t mode)
5254 mddev_t *mddev = disk->private_data;
5257 atomic_dec(&mddev->openers);
5263 static int md_media_changed(struct gendisk *disk)
5265 mddev_t *mddev = disk->private_data;
5267 return mddev->changed;
5270 static int md_revalidate(struct gendisk *disk)
5272 mddev_t *mddev = disk->private_data;
5277 static struct block_device_operations md_fops =
5279 .owner = THIS_MODULE,
5281 .release = md_release,
5282 .locked_ioctl = md_ioctl,
5283 .getgeo = md_getgeo,
5284 .media_changed = md_media_changed,
5285 .revalidate_disk= md_revalidate,
5288 static int md_thread(void * arg)
5290 mdk_thread_t *thread = arg;
5293 * md_thread is a 'system-thread', it's priority should be very
5294 * high. We avoid resource deadlocks individually in each
5295 * raid personality. (RAID5 does preallocation) We also use RR and
5296 * the very same RT priority as kswapd, thus we will never get
5297 * into a priority inversion deadlock.
5299 * we definitely have to have equal or higher priority than
5300 * bdflush, otherwise bdflush will deadlock if there are too
5301 * many dirty RAID5 blocks.
5304 allow_signal(SIGKILL);
5305 while (!kthread_should_stop()) {
5307 /* We need to wait INTERRUPTIBLE so that
5308 * we don't add to the load-average.
5309 * That means we need to be sure no signals are
5312 if (signal_pending(current))
5313 flush_signals(current);
5315 wait_event_interruptible_timeout
5317 test_bit(THREAD_WAKEUP, &thread->flags)
5318 || kthread_should_stop(),
5321 clear_bit(THREAD_WAKEUP, &thread->flags);
5323 thread->run(thread->mddev);
5329 void md_wakeup_thread(mdk_thread_t *thread)
5332 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5333 set_bit(THREAD_WAKEUP, &thread->flags);
5334 wake_up(&thread->wqueue);
5338 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5341 mdk_thread_t *thread;
5343 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5347 init_waitqueue_head(&thread->wqueue);
5350 thread->mddev = mddev;
5351 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5352 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5353 if (IS_ERR(thread->tsk)) {
5360 void md_unregister_thread(mdk_thread_t *thread)
5362 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5364 kthread_stop(thread->tsk);
5368 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5375 if (!rdev || test_bit(Faulty, &rdev->flags))
5378 if (mddev->external)
5379 set_bit(Blocked, &rdev->flags);
5381 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5383 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5384 __builtin_return_address(0),__builtin_return_address(1),
5385 __builtin_return_address(2),__builtin_return_address(3));
5389 if (!mddev->pers->error_handler)
5391 mddev->pers->error_handler(mddev,rdev);
5392 if (mddev->degraded)
5393 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5394 set_bit(StateChanged, &rdev->flags);
5395 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5396 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5397 md_wakeup_thread(mddev->thread);
5398 md_new_event_inintr(mddev);
5401 /* seq_file implementation /proc/mdstat */
5403 static void status_unused(struct seq_file *seq)
5408 seq_printf(seq, "unused devices: ");
5410 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5411 char b[BDEVNAME_SIZE];
5413 seq_printf(seq, "%s ",
5414 bdevname(rdev->bdev,b));
5417 seq_printf(seq, "<none>");
5419 seq_printf(seq, "\n");
5423 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5425 sector_t max_blocks, resync, res;
5426 unsigned long dt, db, rt;
5428 unsigned int per_milli;
5430 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5432 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5433 max_blocks = mddev->resync_max_sectors >> 1;
5435 max_blocks = mddev->size;
5438 * Should not happen.
5444 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5445 * in a sector_t, and (max_blocks>>scale) will fit in a
5446 * u32, as those are the requirements for sector_div.
5447 * Thus 'scale' must be at least 10
5450 if (sizeof(sector_t) > sizeof(unsigned long)) {
5451 while ( max_blocks/2 > (1ULL<<(scale+32)))
5454 res = (resync>>scale)*1000;
5455 sector_div(res, (u32)((max_blocks>>scale)+1));
5459 int i, x = per_milli/50, y = 20-x;
5460 seq_printf(seq, "[");
5461 for (i = 0; i < x; i++)
5462 seq_printf(seq, "=");
5463 seq_printf(seq, ">");
5464 for (i = 0; i < y; i++)
5465 seq_printf(seq, ".");
5466 seq_printf(seq, "] ");
5468 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5469 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5471 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5473 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5474 "resync" : "recovery"))),
5475 per_milli/10, per_milli % 10,
5476 (unsigned long long) resync,
5477 (unsigned long long) max_blocks);
5480 * We do not want to overflow, so the order of operands and
5481 * the * 100 / 100 trick are important. We do a +1 to be
5482 * safe against division by zero. We only estimate anyway.
5484 * dt: time from mark until now
5485 * db: blocks written from mark until now
5486 * rt: remaining time
5488 dt = ((jiffies - mddev->resync_mark) / HZ);
5490 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5491 - mddev->resync_mark_cnt;
5492 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5494 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5496 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5499 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5501 struct list_head *tmp;
5511 spin_lock(&all_mddevs_lock);
5512 list_for_each(tmp,&all_mddevs)
5514 mddev = list_entry(tmp, mddev_t, all_mddevs);
5516 spin_unlock(&all_mddevs_lock);
5519 spin_unlock(&all_mddevs_lock);
5521 return (void*)2;/* tail */
5525 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5527 struct list_head *tmp;
5528 mddev_t *next_mddev, *mddev = v;
5534 spin_lock(&all_mddevs_lock);
5536 tmp = all_mddevs.next;
5538 tmp = mddev->all_mddevs.next;
5539 if (tmp != &all_mddevs)
5540 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5542 next_mddev = (void*)2;
5545 spin_unlock(&all_mddevs_lock);
5553 static void md_seq_stop(struct seq_file *seq, void *v)
5557 if (mddev && v != (void*)1 && v != (void*)2)
5561 struct mdstat_info {
5565 static int md_seq_show(struct seq_file *seq, void *v)
5570 struct mdstat_info *mi = seq->private;
5571 struct bitmap *bitmap;
5573 if (v == (void*)1) {
5574 struct mdk_personality *pers;
5575 seq_printf(seq, "Personalities : ");
5576 spin_lock(&pers_lock);
5577 list_for_each_entry(pers, &pers_list, list)
5578 seq_printf(seq, "[%s] ", pers->name);
5580 spin_unlock(&pers_lock);
5581 seq_printf(seq, "\n");
5582 mi->event = atomic_read(&md_event_count);
5585 if (v == (void*)2) {
5590 if (mddev_lock(mddev) < 0)
5593 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5594 seq_printf(seq, "%s : %sactive", mdname(mddev),
5595 mddev->pers ? "" : "in");
5598 seq_printf(seq, " (read-only)");
5600 seq_printf(seq, " (auto-read-only)");
5601 seq_printf(seq, " %s", mddev->pers->name);
5605 list_for_each_entry(rdev, &mddev->disks, same_set) {
5606 char b[BDEVNAME_SIZE];
5607 seq_printf(seq, " %s[%d]",
5608 bdevname(rdev->bdev,b), rdev->desc_nr);
5609 if (test_bit(WriteMostly, &rdev->flags))
5610 seq_printf(seq, "(W)");
5611 if (test_bit(Faulty, &rdev->flags)) {
5612 seq_printf(seq, "(F)");
5614 } else if (rdev->raid_disk < 0)
5615 seq_printf(seq, "(S)"); /* spare */
5619 if (!list_empty(&mddev->disks)) {
5621 seq_printf(seq, "\n %llu blocks",
5622 (unsigned long long)
5623 mddev->array_sectors / 2);
5625 seq_printf(seq, "\n %llu blocks",
5626 (unsigned long long)size);
5628 if (mddev->persistent) {
5629 if (mddev->major_version != 0 ||
5630 mddev->minor_version != 90) {
5631 seq_printf(seq," super %d.%d",
5632 mddev->major_version,
5633 mddev->minor_version);
5635 } else if (mddev->external)
5636 seq_printf(seq, " super external:%s",
5637 mddev->metadata_type);
5639 seq_printf(seq, " super non-persistent");
5642 mddev->pers->status(seq, mddev);
5643 seq_printf(seq, "\n ");
5644 if (mddev->pers->sync_request) {
5645 if (mddev->curr_resync > 2) {
5646 status_resync(seq, mddev);
5647 seq_printf(seq, "\n ");
5648 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5649 seq_printf(seq, "\tresync=DELAYED\n ");
5650 else if (mddev->recovery_cp < MaxSector)
5651 seq_printf(seq, "\tresync=PENDING\n ");
5654 seq_printf(seq, "\n ");
5656 if ((bitmap = mddev->bitmap)) {
5657 unsigned long chunk_kb;
5658 unsigned long flags;
5659 spin_lock_irqsave(&bitmap->lock, flags);
5660 chunk_kb = bitmap->chunksize >> 10;
5661 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5663 bitmap->pages - bitmap->missing_pages,
5665 (bitmap->pages - bitmap->missing_pages)
5666 << (PAGE_SHIFT - 10),
5667 chunk_kb ? chunk_kb : bitmap->chunksize,
5668 chunk_kb ? "KB" : "B");
5670 seq_printf(seq, ", file: ");
5671 seq_path(seq, &bitmap->file->f_path, " \t\n");
5674 seq_printf(seq, "\n");
5675 spin_unlock_irqrestore(&bitmap->lock, flags);
5678 seq_printf(seq, "\n");
5680 mddev_unlock(mddev);
5685 static struct seq_operations md_seq_ops = {
5686 .start = md_seq_start,
5687 .next = md_seq_next,
5688 .stop = md_seq_stop,
5689 .show = md_seq_show,
5692 static int md_seq_open(struct inode *inode, struct file *file)
5695 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5699 error = seq_open(file, &md_seq_ops);
5703 struct seq_file *p = file->private_data;
5705 mi->event = atomic_read(&md_event_count);
5710 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5712 struct seq_file *m = filp->private_data;
5713 struct mdstat_info *mi = m->private;
5716 poll_wait(filp, &md_event_waiters, wait);
5718 /* always allow read */
5719 mask = POLLIN | POLLRDNORM;
5721 if (mi->event != atomic_read(&md_event_count))
5722 mask |= POLLERR | POLLPRI;
5726 static const struct file_operations md_seq_fops = {
5727 .owner = THIS_MODULE,
5728 .open = md_seq_open,
5730 .llseek = seq_lseek,
5731 .release = seq_release_private,
5732 .poll = mdstat_poll,
5735 int register_md_personality(struct mdk_personality *p)
5737 spin_lock(&pers_lock);
5738 list_add_tail(&p->list, &pers_list);
5739 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5740 spin_unlock(&pers_lock);
5744 int unregister_md_personality(struct mdk_personality *p)
5746 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5747 spin_lock(&pers_lock);
5748 list_del_init(&p->list);
5749 spin_unlock(&pers_lock);
5753 static int is_mddev_idle(mddev_t *mddev, int init)
5761 rdev_for_each_rcu(rdev, mddev) {
5762 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5763 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
5764 (int)part_stat_read(&disk->part0, sectors[1]) -
5765 atomic_read(&disk->sync_io);
5766 /* sync IO will cause sync_io to increase before the disk_stats
5767 * as sync_io is counted when a request starts, and
5768 * disk_stats is counted when it completes.
5769 * So resync activity will cause curr_events to be smaller than
5770 * when there was no such activity.
5771 * non-sync IO will cause disk_stat to increase without
5772 * increasing sync_io so curr_events will (eventually)
5773 * be larger than it was before. Once it becomes
5774 * substantially larger, the test below will cause
5775 * the array to appear non-idle, and resync will slow
5777 * If there is a lot of outstanding resync activity when
5778 * we set last_event to curr_events, then all that activity
5779 * completing might cause the array to appear non-idle
5780 * and resync will be slowed down even though there might
5781 * not have been non-resync activity. This will only
5782 * happen once though. 'last_events' will soon reflect
5783 * the state where there is little or no outstanding
5784 * resync requests, and further resync activity will
5785 * always make curr_events less than last_events.
5788 if (init || curr_events - rdev->last_events > 64) {
5789 rdev->last_events = curr_events;
5797 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5799 /* another "blocks" (512byte) blocks have been synced */
5800 atomic_sub(blocks, &mddev->recovery_active);
5801 wake_up(&mddev->recovery_wait);
5803 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5804 md_wakeup_thread(mddev->thread);
5805 // stop recovery, signal do_sync ....
5810 /* md_write_start(mddev, bi)
5811 * If we need to update some array metadata (e.g. 'active' flag
5812 * in superblock) before writing, schedule a superblock update
5813 * and wait for it to complete.
5815 void md_write_start(mddev_t *mddev, struct bio *bi)
5818 if (bio_data_dir(bi) != WRITE)
5821 BUG_ON(mddev->ro == 1);
5822 if (mddev->ro == 2) {
5823 /* need to switch to read/write */
5825 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5826 md_wakeup_thread(mddev->thread);
5827 md_wakeup_thread(mddev->sync_thread);
5830 atomic_inc(&mddev->writes_pending);
5831 if (mddev->safemode == 1)
5832 mddev->safemode = 0;
5833 if (mddev->in_sync) {
5834 spin_lock_irq(&mddev->write_lock);
5835 if (mddev->in_sync) {
5837 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5838 md_wakeup_thread(mddev->thread);
5841 spin_unlock_irq(&mddev->write_lock);
5844 sysfs_notify_dirent(mddev->sysfs_state);
5845 wait_event(mddev->sb_wait,
5846 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5847 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5850 void md_write_end(mddev_t *mddev)
5852 if (atomic_dec_and_test(&mddev->writes_pending)) {
5853 if (mddev->safemode == 2)
5854 md_wakeup_thread(mddev->thread);
5855 else if (mddev->safemode_delay)
5856 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5860 /* md_allow_write(mddev)
5861 * Calling this ensures that the array is marked 'active' so that writes
5862 * may proceed without blocking. It is important to call this before
5863 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5864 * Must be called with mddev_lock held.
5866 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5867 * is dropped, so return -EAGAIN after notifying userspace.
5869 int md_allow_write(mddev_t *mddev)
5875 if (!mddev->pers->sync_request)
5878 spin_lock_irq(&mddev->write_lock);
5879 if (mddev->in_sync) {
5881 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5882 if (mddev->safemode_delay &&
5883 mddev->safemode == 0)
5884 mddev->safemode = 1;
5885 spin_unlock_irq(&mddev->write_lock);
5886 md_update_sb(mddev, 0);
5887 sysfs_notify_dirent(mddev->sysfs_state);
5889 spin_unlock_irq(&mddev->write_lock);
5891 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5896 EXPORT_SYMBOL_GPL(md_allow_write);
5898 #define SYNC_MARKS 10
5899 #define SYNC_MARK_STEP (3*HZ)
5900 void md_do_sync(mddev_t *mddev)
5903 unsigned int currspeed = 0,
5905 sector_t max_sectors,j, io_sectors;
5906 unsigned long mark[SYNC_MARKS];
5907 sector_t mark_cnt[SYNC_MARKS];
5909 struct list_head *tmp;
5910 sector_t last_check;
5915 /* just incase thread restarts... */
5916 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5918 if (mddev->ro) /* never try to sync a read-only array */
5921 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5922 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5923 desc = "data-check";
5924 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5925 desc = "requested-resync";
5928 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5933 /* we overload curr_resync somewhat here.
5934 * 0 == not engaged in resync at all
5935 * 2 == checking that there is no conflict with another sync
5936 * 1 == like 2, but have yielded to allow conflicting resync to
5938 * other == active in resync - this many blocks
5940 * Before starting a resync we must have set curr_resync to
5941 * 2, and then checked that every "conflicting" array has curr_resync
5942 * less than ours. When we find one that is the same or higher
5943 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5944 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5945 * This will mean we have to start checking from the beginning again.
5950 mddev->curr_resync = 2;
5953 if (kthread_should_stop()) {
5954 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5957 for_each_mddev(mddev2, tmp) {
5958 if (mddev2 == mddev)
5960 if (!mddev->parallel_resync
5961 && mddev2->curr_resync
5962 && match_mddev_units(mddev, mddev2)) {
5964 if (mddev < mddev2 && mddev->curr_resync == 2) {
5965 /* arbitrarily yield */
5966 mddev->curr_resync = 1;
5967 wake_up(&resync_wait);
5969 if (mddev > mddev2 && mddev->curr_resync == 1)
5970 /* no need to wait here, we can wait the next
5971 * time 'round when curr_resync == 2
5974 /* We need to wait 'interruptible' so as not to
5975 * contribute to the load average, and not to
5976 * be caught by 'softlockup'
5978 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5979 if (!kthread_should_stop() &&
5980 mddev2->curr_resync >= mddev->curr_resync) {
5981 printk(KERN_INFO "md: delaying %s of %s"
5982 " until %s has finished (they"
5983 " share one or more physical units)\n",
5984 desc, mdname(mddev), mdname(mddev2));
5986 if (signal_pending(current))
5987 flush_signals(current);
5989 finish_wait(&resync_wait, &wq);
5992 finish_wait(&resync_wait, &wq);
5995 } while (mddev->curr_resync < 2);
5998 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5999 /* resync follows the size requested by the personality,
6000 * which defaults to physical size, but can be virtual size
6002 max_sectors = mddev->resync_max_sectors;
6003 mddev->resync_mismatches = 0;
6004 /* we don't use the checkpoint if there's a bitmap */
6005 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6006 j = mddev->resync_min;
6007 else if (!mddev->bitmap)
6008 j = mddev->recovery_cp;
6010 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6011 max_sectors = mddev->size << 1;
6013 /* recovery follows the physical size of devices */
6014 max_sectors = mddev->size << 1;
6016 list_for_each_entry(rdev, &mddev->disks, same_set)
6017 if (rdev->raid_disk >= 0 &&
6018 !test_bit(Faulty, &rdev->flags) &&
6019 !test_bit(In_sync, &rdev->flags) &&
6020 rdev->recovery_offset < j)
6021 j = rdev->recovery_offset;
6024 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6025 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6026 " %d KB/sec/disk.\n", speed_min(mddev));
6027 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6028 "(but not more than %d KB/sec) for %s.\n",
6029 speed_max(mddev), desc);
6031 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6034 for (m = 0; m < SYNC_MARKS; m++) {
6036 mark_cnt[m] = io_sectors;
6039 mddev->resync_mark = mark[last_mark];
6040 mddev->resync_mark_cnt = mark_cnt[last_mark];
6043 * Tune reconstruction:
6045 window = 32*(PAGE_SIZE/512);
6046 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6047 window/2,(unsigned long long) max_sectors/2);
6049 atomic_set(&mddev->recovery_active, 0);
6054 "md: resuming %s of %s from checkpoint.\n",
6055 desc, mdname(mddev));
6056 mddev->curr_resync = j;
6059 while (j < max_sectors) {
6063 if (j >= mddev->resync_max) {
6064 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6065 wait_event(mddev->recovery_wait,
6066 mddev->resync_max > j
6067 || kthread_should_stop());
6069 if (kthread_should_stop())
6071 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6072 currspeed < speed_min(mddev));
6074 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6078 if (!skipped) { /* actual IO requested */
6079 io_sectors += sectors;
6080 atomic_add(sectors, &mddev->recovery_active);
6084 if (j>1) mddev->curr_resync = j;
6085 mddev->curr_mark_cnt = io_sectors;
6086 if (last_check == 0)
6087 /* this is the earliers that rebuilt will be
6088 * visible in /proc/mdstat
6090 md_new_event(mddev);
6092 if (last_check + window > io_sectors || j == max_sectors)
6095 last_check = io_sectors;
6097 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6101 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6103 int next = (last_mark+1) % SYNC_MARKS;
6105 mddev->resync_mark = mark[next];
6106 mddev->resync_mark_cnt = mark_cnt[next];
6107 mark[next] = jiffies;
6108 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6113 if (kthread_should_stop())
6118 * this loop exits only if either when we are slower than
6119 * the 'hard' speed limit, or the system was IO-idle for
6121 * the system might be non-idle CPU-wise, but we only care
6122 * about not overloading the IO subsystem. (things like an
6123 * e2fsck being done on the RAID array should execute fast)
6125 blk_unplug(mddev->queue);
6128 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6129 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6131 if (currspeed > speed_min(mddev)) {
6132 if ((currspeed > speed_max(mddev)) ||
6133 !is_mddev_idle(mddev, 0)) {
6139 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6141 * this also signals 'finished resyncing' to md_stop
6144 blk_unplug(mddev->queue);
6146 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6148 /* tell personality that we are finished */
6149 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6151 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6152 mddev->curr_resync > 2) {
6153 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6154 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6155 if (mddev->curr_resync >= mddev->recovery_cp) {
6157 "md: checkpointing %s of %s.\n",
6158 desc, mdname(mddev));
6159 mddev->recovery_cp = mddev->curr_resync;
6162 mddev->recovery_cp = MaxSector;
6164 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6165 mddev->curr_resync = MaxSector;
6166 list_for_each_entry(rdev, &mddev->disks, same_set)
6167 if (rdev->raid_disk >= 0 &&
6168 !test_bit(Faulty, &rdev->flags) &&
6169 !test_bit(In_sync, &rdev->flags) &&
6170 rdev->recovery_offset < mddev->curr_resync)
6171 rdev->recovery_offset = mddev->curr_resync;
6174 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6177 mddev->curr_resync = 0;
6178 mddev->resync_min = 0;
6179 mddev->resync_max = MaxSector;
6180 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6181 wake_up(&resync_wait);
6182 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6183 md_wakeup_thread(mddev->thread);
6188 * got a signal, exit.
6191 "md: md_do_sync() got signal ... exiting\n");
6192 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6196 EXPORT_SYMBOL_GPL(md_do_sync);
6199 static int remove_and_add_spares(mddev_t *mddev)
6204 list_for_each_entry(rdev, &mddev->disks, same_set)
6205 if (rdev->raid_disk >= 0 &&
6206 !test_bit(Blocked, &rdev->flags) &&
6207 (test_bit(Faulty, &rdev->flags) ||
6208 ! test_bit(In_sync, &rdev->flags)) &&
6209 atomic_read(&rdev->nr_pending)==0) {
6210 if (mddev->pers->hot_remove_disk(
6211 mddev, rdev->raid_disk)==0) {
6213 sprintf(nm,"rd%d", rdev->raid_disk);
6214 sysfs_remove_link(&mddev->kobj, nm);
6215 rdev->raid_disk = -1;
6219 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6220 list_for_each_entry(rdev, &mddev->disks, same_set) {
6221 if (rdev->raid_disk >= 0 &&
6222 !test_bit(In_sync, &rdev->flags) &&
6223 !test_bit(Blocked, &rdev->flags))
6225 if (rdev->raid_disk < 0
6226 && !test_bit(Faulty, &rdev->flags)) {
6227 rdev->recovery_offset = 0;
6229 hot_add_disk(mddev, rdev) == 0) {
6231 sprintf(nm, "rd%d", rdev->raid_disk);
6232 if (sysfs_create_link(&mddev->kobj,
6235 "md: cannot register "
6239 md_new_event(mddev);
6248 * This routine is regularly called by all per-raid-array threads to
6249 * deal with generic issues like resync and super-block update.
6250 * Raid personalities that don't have a thread (linear/raid0) do not
6251 * need this as they never do any recovery or update the superblock.
6253 * It does not do any resync itself, but rather "forks" off other threads
6254 * to do that as needed.
6255 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6256 * "->recovery" and create a thread at ->sync_thread.
6257 * When the thread finishes it sets MD_RECOVERY_DONE
6258 * and wakeups up this thread which will reap the thread and finish up.
6259 * This thread also removes any faulty devices (with nr_pending == 0).
6261 * The overall approach is:
6262 * 1/ if the superblock needs updating, update it.
6263 * 2/ If a recovery thread is running, don't do anything else.
6264 * 3/ If recovery has finished, clean up, possibly marking spares active.
6265 * 4/ If there are any faulty devices, remove them.
6266 * 5/ If array is degraded, try to add spares devices
6267 * 6/ If array has spares or is not in-sync, start a resync thread.
6269 void md_check_recovery(mddev_t *mddev)
6275 bitmap_daemon_work(mddev->bitmap);
6280 if (signal_pending(current)) {
6281 if (mddev->pers->sync_request && !mddev->external) {
6282 printk(KERN_INFO "md: %s in immediate safe mode\n",
6284 mddev->safemode = 2;
6286 flush_signals(current);
6289 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6292 (mddev->flags && !mddev->external) ||
6293 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6294 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6295 (mddev->external == 0 && mddev->safemode == 1) ||
6296 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6297 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6301 if (mddev_trylock(mddev)) {
6305 /* Only thing we do on a ro array is remove
6308 remove_and_add_spares(mddev);
6309 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6313 if (!mddev->external) {
6315 spin_lock_irq(&mddev->write_lock);
6316 if (mddev->safemode &&
6317 !atomic_read(&mddev->writes_pending) &&
6319 mddev->recovery_cp == MaxSector) {
6322 if (mddev->persistent)
6323 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6325 if (mddev->safemode == 1)
6326 mddev->safemode = 0;
6327 spin_unlock_irq(&mddev->write_lock);
6329 sysfs_notify_dirent(mddev->sysfs_state);
6333 md_update_sb(mddev, 0);
6335 list_for_each_entry(rdev, &mddev->disks, same_set)
6336 if (test_and_clear_bit(StateChanged, &rdev->flags))
6337 sysfs_notify_dirent(rdev->sysfs_state);
6340 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6341 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6342 /* resync/recovery still happening */
6343 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6346 if (mddev->sync_thread) {
6347 /* resync has finished, collect result */
6348 md_unregister_thread(mddev->sync_thread);
6349 mddev->sync_thread = NULL;
6350 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6351 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6353 /* activate any spares */
6354 if (mddev->pers->spare_active(mddev))
6355 sysfs_notify(&mddev->kobj, NULL,
6358 md_update_sb(mddev, 1);
6360 /* if array is no-longer degraded, then any saved_raid_disk
6361 * information must be scrapped
6363 if (!mddev->degraded)
6364 list_for_each_entry(rdev, &mddev->disks, same_set)
6365 rdev->saved_raid_disk = -1;
6367 mddev->recovery = 0;
6368 /* flag recovery needed just to double check */
6369 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6370 sysfs_notify_dirent(mddev->sysfs_action);
6371 md_new_event(mddev);
6374 /* Set RUNNING before clearing NEEDED to avoid
6375 * any transients in the value of "sync_action".
6377 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6378 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6379 /* Clear some bits that don't mean anything, but
6382 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6383 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6385 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6387 /* no recovery is running.
6388 * remove any failed drives, then
6389 * add spares if possible.
6390 * Spare are also removed and re-added, to allow
6391 * the personality to fail the re-add.
6394 if (mddev->reshape_position != MaxSector) {
6395 if (mddev->pers->check_reshape(mddev) != 0)
6396 /* Cannot proceed */
6398 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6399 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6400 } else if ((spares = remove_and_add_spares(mddev))) {
6401 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6402 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6403 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6404 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6405 } else if (mddev->recovery_cp < MaxSector) {
6406 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6407 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6408 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6409 /* nothing to be done ... */
6412 if (mddev->pers->sync_request) {
6413 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6414 /* We are adding a device or devices to an array
6415 * which has the bitmap stored on all devices.
6416 * So make sure all bitmap pages get written
6418 bitmap_write_all(mddev->bitmap);
6420 mddev->sync_thread = md_register_thread(md_do_sync,
6423 if (!mddev->sync_thread) {
6424 printk(KERN_ERR "%s: could not start resync"
6427 /* leave the spares where they are, it shouldn't hurt */
6428 mddev->recovery = 0;
6430 md_wakeup_thread(mddev->sync_thread);
6431 sysfs_notify_dirent(mddev->sysfs_action);
6432 md_new_event(mddev);
6435 if (!mddev->sync_thread) {
6436 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6437 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6439 if (mddev->sysfs_action)
6440 sysfs_notify_dirent(mddev->sysfs_action);
6442 mddev_unlock(mddev);
6446 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6448 sysfs_notify_dirent(rdev->sysfs_state);
6449 wait_event_timeout(rdev->blocked_wait,
6450 !test_bit(Blocked, &rdev->flags),
6451 msecs_to_jiffies(5000));
6452 rdev_dec_pending(rdev, mddev);
6454 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6456 static int md_notify_reboot(struct notifier_block *this,
6457 unsigned long code, void *x)
6459 struct list_head *tmp;
6462 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6464 printk(KERN_INFO "md: stopping all md devices.\n");
6466 for_each_mddev(mddev, tmp)
6467 if (mddev_trylock(mddev)) {
6468 /* Force a switch to readonly even array
6469 * appears to still be in use. Hence
6472 do_md_stop(mddev, 1, 100);
6473 mddev_unlock(mddev);
6476 * certain more exotic SCSI devices are known to be
6477 * volatile wrt too early system reboots. While the
6478 * right place to handle this issue is the given
6479 * driver, we do want to have a safe RAID driver ...
6486 static struct notifier_block md_notifier = {
6487 .notifier_call = md_notify_reboot,
6489 .priority = INT_MAX, /* before any real devices */
6492 static void md_geninit(void)
6494 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6496 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6499 static int __init md_init(void)
6501 if (register_blkdev(MD_MAJOR, "md"))
6503 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6504 unregister_blkdev(MD_MAJOR, "md");
6507 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
6508 md_probe, NULL, NULL);
6509 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6510 md_probe, NULL, NULL);
6512 register_reboot_notifier(&md_notifier);
6513 raid_table_header = register_sysctl_table(raid_root_table);
6523 * Searches all registered partitions for autorun RAID arrays
6527 static LIST_HEAD(all_detected_devices);
6528 struct detected_devices_node {
6529 struct list_head list;
6533 void md_autodetect_dev(dev_t dev)
6535 struct detected_devices_node *node_detected_dev;
6537 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6538 if (node_detected_dev) {
6539 node_detected_dev->dev = dev;
6540 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6542 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6543 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6548 static void autostart_arrays(int part)
6551 struct detected_devices_node *node_detected_dev;
6553 int i_scanned, i_passed;
6558 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6560 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6562 node_detected_dev = list_entry(all_detected_devices.next,
6563 struct detected_devices_node, list);
6564 list_del(&node_detected_dev->list);
6565 dev = node_detected_dev->dev;
6566 kfree(node_detected_dev);
6567 rdev = md_import_device(dev,0, 90);
6571 if (test_bit(Faulty, &rdev->flags)) {
6575 set_bit(AutoDetected, &rdev->flags);
6576 list_add(&rdev->same_set, &pending_raid_disks);
6580 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6581 i_scanned, i_passed);
6583 autorun_devices(part);
6586 #endif /* !MODULE */
6588 static __exit void md_exit(void)
6591 struct list_head *tmp;
6593 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
6594 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6596 unregister_blkdev(MD_MAJOR,"md");
6597 unregister_blkdev(mdp_major, "mdp");
6598 unregister_reboot_notifier(&md_notifier);
6599 unregister_sysctl_table(raid_table_header);
6600 remove_proc_entry("mdstat", NULL);
6601 for_each_mddev(mddev, tmp) {
6602 export_array(mddev);
6603 mddev->hold_active = 0;
6607 subsys_initcall(md_init);
6608 module_exit(md_exit)
6610 static int get_ro(char *buffer, struct kernel_param *kp)
6612 return sprintf(buffer, "%d", start_readonly);
6614 static int set_ro(const char *val, struct kernel_param *kp)
6617 int num = simple_strtoul(val, &e, 10);
6618 if (*val && (*e == '\0' || *e == '\n')) {
6619 start_readonly = num;
6625 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6626 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6628 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6630 EXPORT_SYMBOL(register_md_personality);
6631 EXPORT_SYMBOL(unregister_md_personality);
6632 EXPORT_SYMBOL(md_error);
6633 EXPORT_SYMBOL(md_done_sync);
6634 EXPORT_SYMBOL(md_write_start);
6635 EXPORT_SYMBOL(md_write_end);
6636 EXPORT_SYMBOL(md_register_thread);
6637 EXPORT_SYMBOL(md_unregister_thread);
6638 EXPORT_SYMBOL(md_wakeup_thread);
6639 EXPORT_SYMBOL(md_check_recovery);
6640 MODULE_LICENSE("GPL");
6642 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);