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/raid/bitmap.h>
38 #include <linux/sysctl.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
49 #define MAJOR_NR MD_MAJOR
51 /* 63 partitions with the alternate major number (mdp) */
52 #define MdpMinorShift 6
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part);
62 static LIST_HEAD(pers_list);
63 static DEFINE_SPINLOCK(pers_lock);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
73 * is 1000 KB/sec, so the extra system load does not show up that much.
74 * Increase it if you want to have more _guaranteed_ speed. Note that
75 * the RAID driver will use the maximum available bandwidth if the IO
76 * subsystem is idle. There is also an 'absolute maximum' reconstruction
77 * speed limit - in case reconstruction slows down your system despite
80 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
81 * or /sys/block/mdX/md/sync_speed_{min,max}
84 static int sysctl_speed_limit_min = 1000;
85 static int sysctl_speed_limit_max = 200000;
86 static inline int speed_min(mddev_t *mddev)
88 return mddev->sync_speed_min ?
89 mddev->sync_speed_min : sysctl_speed_limit_min;
92 static inline int speed_max(mddev_t *mddev)
94 return mddev->sync_speed_max ?
95 mddev->sync_speed_max : sysctl_speed_limit_max;
98 static struct ctl_table_header *raid_table_header;
100 static ctl_table raid_table[] = {
102 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
103 .procname = "speed_limit_min",
104 .data = &sysctl_speed_limit_min,
105 .maxlen = sizeof(int),
106 .mode = S_IRUGO|S_IWUSR,
107 .proc_handler = &proc_dointvec,
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
111 .procname = "speed_limit_max",
112 .data = &sysctl_speed_limit_max,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
120 static ctl_table raid_dir_table[] = {
122 .ctl_name = DEV_RAID,
125 .mode = S_IRUGO|S_IXUGO,
131 static ctl_table raid_root_table[] = {
137 .child = raid_dir_table,
142 static struct block_device_operations md_fops;
144 static int start_readonly;
147 * We have a system wide 'event count' that is incremented
148 * on any 'interesting' event, and readers of /proc/mdstat
149 * can use 'poll' or 'select' to find out when the event
153 * start array, stop array, error, add device, remove device,
154 * start build, activate spare
156 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
157 static atomic_t md_event_count;
158 void md_new_event(mddev_t *mddev)
160 atomic_inc(&md_event_count);
161 wake_up(&md_event_waiters);
163 EXPORT_SYMBOL_GPL(md_new_event);
165 /* Alternate version that can be called from interrupts
166 * when calling sysfs_notify isn't needed.
168 static void md_new_event_inintr(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
175 * Enables to iterate over all existing md arrays
176 * all_mddevs_lock protects this list.
178 static LIST_HEAD(all_mddevs);
179 static DEFINE_SPINLOCK(all_mddevs_lock);
183 * iterates through all used mddevs in the system.
184 * We take care to grab the all_mddevs_lock whenever navigating
185 * the list, and to always hold a refcount when unlocked.
186 * Any code which breaks out of this loop while own
187 * a reference to the current mddev and must mddev_put it.
189 #define for_each_mddev(mddev,tmp) \
191 for (({ spin_lock(&all_mddevs_lock); \
192 tmp = all_mddevs.next; \
194 ({ if (tmp != &all_mddevs) \
195 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
196 spin_unlock(&all_mddevs_lock); \
197 if (mddev) mddev_put(mddev); \
198 mddev = list_entry(tmp, mddev_t, all_mddevs); \
199 tmp != &all_mddevs;}); \
200 ({ spin_lock(&all_mddevs_lock); \
205 static int md_fail_request(struct request_queue *q, struct bio *bio)
211 static inline mddev_t *mddev_get(mddev_t *mddev)
213 atomic_inc(&mddev->active);
217 static void mddev_delayed_delete(struct work_struct *ws)
219 mddev_t *mddev = container_of(ws, mddev_t, del_work);
220 kobject_del(&mddev->kobj);
221 kobject_put(&mddev->kobj);
224 static void mddev_put(mddev_t *mddev)
226 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
228 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
229 !mddev->hold_active) {
230 list_del(&mddev->all_mddevs);
231 if (mddev->gendisk) {
232 /* we did a probe so need to clean up.
233 * Call schedule_work inside the spinlock
234 * so that flush_scheduled_work() after
235 * mddev_find will succeed in waiting for the
238 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
239 schedule_work(&mddev->del_work);
243 spin_unlock(&all_mddevs_lock);
246 static mddev_t * mddev_find(dev_t unit)
248 mddev_t *mddev, *new = NULL;
251 spin_lock(&all_mddevs_lock);
254 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
255 if (mddev->unit == unit) {
257 spin_unlock(&all_mddevs_lock);
263 list_add(&new->all_mddevs, &all_mddevs);
264 spin_unlock(&all_mddevs_lock);
265 new->hold_active = UNTIL_IOCTL;
269 /* find an unused unit number */
270 static int next_minor = 512;
271 int start = next_minor;
275 dev = MKDEV(MD_MAJOR, next_minor);
277 if (next_minor > MINORMASK)
279 if (next_minor == start) {
280 /* Oh dear, all in use. */
281 spin_unlock(&all_mddevs_lock);
287 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
288 if (mddev->unit == dev) {
294 new->md_minor = MINOR(dev);
295 new->hold_active = UNTIL_STOP;
296 list_add(&new->all_mddevs, &all_mddevs);
297 spin_unlock(&all_mddevs_lock);
300 spin_unlock(&all_mddevs_lock);
302 new = kzalloc(sizeof(*new), GFP_KERNEL);
307 if (MAJOR(unit) == MD_MAJOR)
308 new->md_minor = MINOR(unit);
310 new->md_minor = MINOR(unit) >> MdpMinorShift;
312 mutex_init(&new->reconfig_mutex);
313 INIT_LIST_HEAD(&new->disks);
314 INIT_LIST_HEAD(&new->all_mddevs);
315 init_timer(&new->safemode_timer);
316 atomic_set(&new->active, 1);
317 atomic_set(&new->openers, 0);
318 spin_lock_init(&new->write_lock);
319 init_waitqueue_head(&new->sb_wait);
320 init_waitqueue_head(&new->recovery_wait);
321 new->reshape_position = MaxSector;
323 new->resync_max = MaxSector;
324 new->level = LEVEL_NONE;
329 static inline int mddev_lock(mddev_t * mddev)
331 return mutex_lock_interruptible(&mddev->reconfig_mutex);
334 static inline int mddev_trylock(mddev_t * mddev)
336 return mutex_trylock(&mddev->reconfig_mutex);
339 static inline void mddev_unlock(mddev_t * mddev)
341 mutex_unlock(&mddev->reconfig_mutex);
343 md_wakeup_thread(mddev->thread);
346 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
350 list_for_each_entry(rdev, &mddev->disks, same_set)
351 if (rdev->desc_nr == nr)
357 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
361 list_for_each_entry(rdev, &mddev->disks, same_set)
362 if (rdev->bdev->bd_dev == dev)
368 static struct mdk_personality *find_pers(int level, char *clevel)
370 struct mdk_personality *pers;
371 list_for_each_entry(pers, &pers_list, list) {
372 if (level != LEVEL_NONE && pers->level == level)
374 if (strcmp(pers->name, clevel)==0)
380 /* return the offset of the super block in 512byte sectors */
381 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
383 sector_t num_sectors = bdev->bd_inode->i_size / 512;
384 return MD_NEW_SIZE_SECTORS(num_sectors);
387 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
389 sector_t num_sectors = rdev->sb_start;
392 num_sectors &= ~((sector_t)chunk_size/512 - 1);
396 static int alloc_disk_sb(mdk_rdev_t * rdev)
401 rdev->sb_page = alloc_page(GFP_KERNEL);
402 if (!rdev->sb_page) {
403 printk(KERN_ALERT "md: out of memory.\n");
410 static void free_disk_sb(mdk_rdev_t * rdev)
413 put_page(rdev->sb_page);
415 rdev->sb_page = NULL;
422 static void super_written(struct bio *bio, int error)
424 mdk_rdev_t *rdev = bio->bi_private;
425 mddev_t *mddev = rdev->mddev;
427 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
428 printk("md: super_written gets error=%d, uptodate=%d\n",
429 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
430 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
431 md_error(mddev, rdev);
434 if (atomic_dec_and_test(&mddev->pending_writes))
435 wake_up(&mddev->sb_wait);
439 static void super_written_barrier(struct bio *bio, int error)
441 struct bio *bio2 = bio->bi_private;
442 mdk_rdev_t *rdev = bio2->bi_private;
443 mddev_t *mddev = rdev->mddev;
445 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
446 error == -EOPNOTSUPP) {
448 /* barriers don't appear to be supported :-( */
449 set_bit(BarriersNotsupp, &rdev->flags);
450 mddev->barriers_work = 0;
451 spin_lock_irqsave(&mddev->write_lock, flags);
452 bio2->bi_next = mddev->biolist;
453 mddev->biolist = bio2;
454 spin_unlock_irqrestore(&mddev->write_lock, flags);
455 wake_up(&mddev->sb_wait);
459 bio->bi_private = rdev;
460 super_written(bio, error);
464 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
465 sector_t sector, int size, struct page *page)
467 /* write first size bytes of page to sector of rdev
468 * Increment mddev->pending_writes before returning
469 * and decrement it on completion, waking up sb_wait
470 * if zero is reached.
471 * If an error occurred, call md_error
473 * As we might need to resubmit the request if BIO_RW_BARRIER
474 * causes ENOTSUPP, we allocate a spare bio...
476 struct bio *bio = bio_alloc(GFP_NOIO, 1);
477 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
479 bio->bi_bdev = rdev->bdev;
480 bio->bi_sector = sector;
481 bio_add_page(bio, page, size, 0);
482 bio->bi_private = rdev;
483 bio->bi_end_io = super_written;
486 atomic_inc(&mddev->pending_writes);
487 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
489 rw |= (1<<BIO_RW_BARRIER);
490 rbio = bio_clone(bio, GFP_NOIO);
491 rbio->bi_private = bio;
492 rbio->bi_end_io = super_written_barrier;
493 submit_bio(rw, rbio);
498 void md_super_wait(mddev_t *mddev)
500 /* wait for all superblock writes that were scheduled to complete.
501 * if any had to be retried (due to BARRIER problems), retry them
505 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
506 if (atomic_read(&mddev->pending_writes)==0)
508 while (mddev->biolist) {
510 spin_lock_irq(&mddev->write_lock);
511 bio = mddev->biolist;
512 mddev->biolist = bio->bi_next ;
514 spin_unlock_irq(&mddev->write_lock);
515 submit_bio(bio->bi_rw, bio);
519 finish_wait(&mddev->sb_wait, &wq);
522 static void bi_complete(struct bio *bio, int error)
524 complete((struct completion*)bio->bi_private);
527 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
528 struct page *page, int rw)
530 struct bio *bio = bio_alloc(GFP_NOIO, 1);
531 struct completion event;
534 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
537 bio->bi_sector = sector;
538 bio_add_page(bio, page, size, 0);
539 init_completion(&event);
540 bio->bi_private = &event;
541 bio->bi_end_io = bi_complete;
543 wait_for_completion(&event);
545 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
549 EXPORT_SYMBOL_GPL(sync_page_io);
551 static int read_disk_sb(mdk_rdev_t * rdev, int size)
553 char b[BDEVNAME_SIZE];
554 if (!rdev->sb_page) {
562 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
568 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
569 bdevname(rdev->bdev,b));
573 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
575 return sb1->set_uuid0 == sb2->set_uuid0 &&
576 sb1->set_uuid1 == sb2->set_uuid1 &&
577 sb1->set_uuid2 == sb2->set_uuid2 &&
578 sb1->set_uuid3 == sb2->set_uuid3;
581 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
584 mdp_super_t *tmp1, *tmp2;
586 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
587 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
589 if (!tmp1 || !tmp2) {
591 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
599 * nr_disks is not constant
604 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
612 static u32 md_csum_fold(u32 csum)
614 csum = (csum & 0xffff) + (csum >> 16);
615 return (csum & 0xffff) + (csum >> 16);
618 static unsigned int calc_sb_csum(mdp_super_t * sb)
621 u32 *sb32 = (u32*)sb;
623 unsigned int disk_csum, csum;
625 disk_csum = sb->sb_csum;
628 for (i = 0; i < MD_SB_BYTES/4 ; i++)
630 csum = (newcsum & 0xffffffff) + (newcsum>>32);
634 /* This used to use csum_partial, which was wrong for several
635 * reasons including that different results are returned on
636 * different architectures. It isn't critical that we get exactly
637 * the same return value as before (we always csum_fold before
638 * testing, and that removes any differences). However as we
639 * know that csum_partial always returned a 16bit value on
640 * alphas, do a fold to maximise conformity to previous behaviour.
642 sb->sb_csum = md_csum_fold(disk_csum);
644 sb->sb_csum = disk_csum;
651 * Handle superblock details.
652 * We want to be able to handle multiple superblock formats
653 * so we have a common interface to them all, and an array of
654 * different handlers.
655 * We rely on user-space to write the initial superblock, and support
656 * reading and updating of superblocks.
657 * Interface methods are:
658 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
659 * loads and validates a superblock on dev.
660 * if refdev != NULL, compare superblocks on both devices
662 * 0 - dev has a superblock that is compatible with refdev
663 * 1 - dev has a superblock that is compatible and newer than refdev
664 * so dev should be used as the refdev in future
665 * -EINVAL superblock incompatible or invalid
666 * -othererror e.g. -EIO
668 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
669 * Verify that dev is acceptable into mddev.
670 * The first time, mddev->raid_disks will be 0, and data from
671 * dev should be merged in. Subsequent calls check that dev
672 * is new enough. Return 0 or -EINVAL
674 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
675 * Update the superblock for rdev with data in mddev
676 * This does not write to disc.
682 struct module *owner;
683 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
685 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
686 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
687 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
688 sector_t num_sectors);
692 * load_super for 0.90.0
694 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
696 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
701 * Calculate the position of the superblock (512byte sectors),
702 * it's at the end of the disk.
704 * It also happens to be a multiple of 4Kb.
706 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
708 ret = read_disk_sb(rdev, MD_SB_BYTES);
713 bdevname(rdev->bdev, b);
714 sb = (mdp_super_t*)page_address(rdev->sb_page);
716 if (sb->md_magic != MD_SB_MAGIC) {
717 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
722 if (sb->major_version != 0 ||
723 sb->minor_version < 90 ||
724 sb->minor_version > 91) {
725 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
726 sb->major_version, sb->minor_version,
731 if (sb->raid_disks <= 0)
734 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
735 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
740 rdev->preferred_minor = sb->md_minor;
741 rdev->data_offset = 0;
742 rdev->sb_size = MD_SB_BYTES;
744 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
745 if (sb->level != 1 && sb->level != 4
746 && sb->level != 5 && sb->level != 6
747 && sb->level != 10) {
748 /* FIXME use a better test */
750 "md: bitmaps not supported for this level.\n");
755 if (sb->level == LEVEL_MULTIPATH)
758 rdev->desc_nr = sb->this_disk.number;
764 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
765 if (!uuid_equal(refsb, sb)) {
766 printk(KERN_WARNING "md: %s has different UUID to %s\n",
767 b, bdevname(refdev->bdev,b2));
770 if (!sb_equal(refsb, sb)) {
771 printk(KERN_WARNING "md: %s has same UUID"
772 " but different superblock to %s\n",
773 b, bdevname(refdev->bdev, b2));
777 ev2 = md_event(refsb);
783 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
785 if (rdev->size < sb->size && sb->level > 1)
786 /* "this cannot possibly happen" ... */
794 * validate_super for 0.90.0
796 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
799 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
800 __u64 ev1 = md_event(sb);
802 rdev->raid_disk = -1;
803 clear_bit(Faulty, &rdev->flags);
804 clear_bit(In_sync, &rdev->flags);
805 clear_bit(WriteMostly, &rdev->flags);
806 clear_bit(BarriersNotsupp, &rdev->flags);
808 if (mddev->raid_disks == 0) {
809 mddev->major_version = 0;
810 mddev->minor_version = sb->minor_version;
811 mddev->patch_version = sb->patch_version;
813 mddev->chunk_size = sb->chunk_size;
814 mddev->ctime = sb->ctime;
815 mddev->utime = sb->utime;
816 mddev->level = sb->level;
817 mddev->clevel[0] = 0;
818 mddev->layout = sb->layout;
819 mddev->raid_disks = sb->raid_disks;
820 mddev->size = sb->size;
822 mddev->bitmap_offset = 0;
823 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
825 if (mddev->minor_version >= 91) {
826 mddev->reshape_position = sb->reshape_position;
827 mddev->delta_disks = sb->delta_disks;
828 mddev->new_level = sb->new_level;
829 mddev->new_layout = sb->new_layout;
830 mddev->new_chunk = sb->new_chunk;
832 mddev->reshape_position = MaxSector;
833 mddev->delta_disks = 0;
834 mddev->new_level = mddev->level;
835 mddev->new_layout = mddev->layout;
836 mddev->new_chunk = mddev->chunk_size;
839 if (sb->state & (1<<MD_SB_CLEAN))
840 mddev->recovery_cp = MaxSector;
842 if (sb->events_hi == sb->cp_events_hi &&
843 sb->events_lo == sb->cp_events_lo) {
844 mddev->recovery_cp = sb->recovery_cp;
846 mddev->recovery_cp = 0;
849 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
850 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
851 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
852 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
854 mddev->max_disks = MD_SB_DISKS;
856 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
857 mddev->bitmap_file == NULL)
858 mddev->bitmap_offset = mddev->default_bitmap_offset;
860 } else if (mddev->pers == NULL) {
861 /* Insist on good event counter while assembling */
863 if (ev1 < mddev->events)
865 } else if (mddev->bitmap) {
866 /* if adding to array with a bitmap, then we can accept an
867 * older device ... but not too old.
869 if (ev1 < mddev->bitmap->events_cleared)
872 if (ev1 < mddev->events)
873 /* just a hot-add of a new device, leave raid_disk at -1 */
877 if (mddev->level != LEVEL_MULTIPATH) {
878 desc = sb->disks + rdev->desc_nr;
880 if (desc->state & (1<<MD_DISK_FAULTY))
881 set_bit(Faulty, &rdev->flags);
882 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
883 desc->raid_disk < mddev->raid_disks */) {
884 set_bit(In_sync, &rdev->flags);
885 rdev->raid_disk = desc->raid_disk;
887 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
888 set_bit(WriteMostly, &rdev->flags);
889 } else /* MULTIPATH are always insync */
890 set_bit(In_sync, &rdev->flags);
895 * sync_super for 0.90.0
897 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
901 int next_spare = mddev->raid_disks;
904 /* make rdev->sb match mddev data..
907 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
908 * 3/ any empty disks < next_spare become removed
910 * disks[0] gets initialised to REMOVED because
911 * we cannot be sure from other fields if it has
912 * been initialised or not.
915 int active=0, working=0,failed=0,spare=0,nr_disks=0;
917 rdev->sb_size = MD_SB_BYTES;
919 sb = (mdp_super_t*)page_address(rdev->sb_page);
921 memset(sb, 0, sizeof(*sb));
923 sb->md_magic = MD_SB_MAGIC;
924 sb->major_version = mddev->major_version;
925 sb->patch_version = mddev->patch_version;
926 sb->gvalid_words = 0; /* ignored */
927 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
928 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
929 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
930 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
932 sb->ctime = mddev->ctime;
933 sb->level = mddev->level;
934 sb->size = mddev->size;
935 sb->raid_disks = mddev->raid_disks;
936 sb->md_minor = mddev->md_minor;
937 sb->not_persistent = 0;
938 sb->utime = mddev->utime;
940 sb->events_hi = (mddev->events>>32);
941 sb->events_lo = (u32)mddev->events;
943 if (mddev->reshape_position == MaxSector)
944 sb->minor_version = 90;
946 sb->minor_version = 91;
947 sb->reshape_position = mddev->reshape_position;
948 sb->new_level = mddev->new_level;
949 sb->delta_disks = mddev->delta_disks;
950 sb->new_layout = mddev->new_layout;
951 sb->new_chunk = mddev->new_chunk;
953 mddev->minor_version = sb->minor_version;
956 sb->recovery_cp = mddev->recovery_cp;
957 sb->cp_events_hi = (mddev->events>>32);
958 sb->cp_events_lo = (u32)mddev->events;
959 if (mddev->recovery_cp == MaxSector)
960 sb->state = (1<< MD_SB_CLEAN);
964 sb->layout = mddev->layout;
965 sb->chunk_size = mddev->chunk_size;
967 if (mddev->bitmap && mddev->bitmap_file == NULL)
968 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
970 sb->disks[0].state = (1<<MD_DISK_REMOVED);
971 list_for_each_entry(rdev2, &mddev->disks, same_set) {
974 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
975 && !test_bit(Faulty, &rdev2->flags))
976 desc_nr = rdev2->raid_disk;
978 desc_nr = next_spare++;
979 rdev2->desc_nr = desc_nr;
980 d = &sb->disks[rdev2->desc_nr];
982 d->number = rdev2->desc_nr;
983 d->major = MAJOR(rdev2->bdev->bd_dev);
984 d->minor = MINOR(rdev2->bdev->bd_dev);
985 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
986 && !test_bit(Faulty, &rdev2->flags))
987 d->raid_disk = rdev2->raid_disk;
989 d->raid_disk = rdev2->desc_nr; /* compatibility */
990 if (test_bit(Faulty, &rdev2->flags))
991 d->state = (1<<MD_DISK_FAULTY);
992 else if (test_bit(In_sync, &rdev2->flags)) {
993 d->state = (1<<MD_DISK_ACTIVE);
994 d->state |= (1<<MD_DISK_SYNC);
1002 if (test_bit(WriteMostly, &rdev2->flags))
1003 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1005 /* now set the "removed" and "faulty" bits on any missing devices */
1006 for (i=0 ; i < mddev->raid_disks ; i++) {
1007 mdp_disk_t *d = &sb->disks[i];
1008 if (d->state == 0 && d->number == 0) {
1011 d->state = (1<<MD_DISK_REMOVED);
1012 d->state |= (1<<MD_DISK_FAULTY);
1016 sb->nr_disks = nr_disks;
1017 sb->active_disks = active;
1018 sb->working_disks = working;
1019 sb->failed_disks = failed;
1020 sb->spare_disks = spare;
1022 sb->this_disk = sb->disks[rdev->desc_nr];
1023 sb->sb_csum = calc_sb_csum(sb);
1027 * rdev_size_change for 0.90.0
1029 static unsigned long long
1030 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1032 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1033 return 0; /* component must fit device */
1034 if (rdev->mddev->bitmap_offset)
1035 return 0; /* can't move bitmap */
1036 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1037 if (!num_sectors || num_sectors > rdev->sb_start)
1038 num_sectors = rdev->sb_start;
1039 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1041 md_super_wait(rdev->mddev);
1042 return num_sectors / 2; /* kB for sysfs */
1047 * version 1 superblock
1050 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1054 unsigned long long newcsum;
1055 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1056 __le32 *isuper = (__le32*)sb;
1059 disk_csum = sb->sb_csum;
1062 for (i=0; size>=4; size -= 4 )
1063 newcsum += le32_to_cpu(*isuper++);
1066 newcsum += le16_to_cpu(*(__le16*) isuper);
1068 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1069 sb->sb_csum = disk_csum;
1070 return cpu_to_le32(csum);
1073 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1075 struct mdp_superblock_1 *sb;
1078 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1082 * Calculate the position of the superblock in 512byte sectors.
1083 * It is always aligned to a 4K boundary and
1084 * depeding on minor_version, it can be:
1085 * 0: At least 8K, but less than 12K, from end of device
1086 * 1: At start of device
1087 * 2: 4K from start of device.
1089 switch(minor_version) {
1091 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1093 sb_start &= ~(sector_t)(4*2-1);
1104 rdev->sb_start = sb_start;
1106 /* superblock is rarely larger than 1K, but it can be larger,
1107 * and it is safe to read 4k, so we do that
1109 ret = read_disk_sb(rdev, 4096);
1110 if (ret) return ret;
1113 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1115 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1116 sb->major_version != cpu_to_le32(1) ||
1117 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1118 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1119 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1122 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1123 printk("md: invalid superblock checksum on %s\n",
1124 bdevname(rdev->bdev,b));
1127 if (le64_to_cpu(sb->data_size) < 10) {
1128 printk("md: data_size too small on %s\n",
1129 bdevname(rdev->bdev,b));
1132 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1133 if (sb->level != cpu_to_le32(1) &&
1134 sb->level != cpu_to_le32(4) &&
1135 sb->level != cpu_to_le32(5) &&
1136 sb->level != cpu_to_le32(6) &&
1137 sb->level != cpu_to_le32(10)) {
1139 "md: bitmaps not supported for this level.\n");
1144 rdev->preferred_minor = 0xffff;
1145 rdev->data_offset = le64_to_cpu(sb->data_offset);
1146 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1148 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1149 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1150 if (rdev->sb_size & bmask)
1151 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1154 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1157 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1160 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1166 struct mdp_superblock_1 *refsb =
1167 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1169 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1170 sb->level != refsb->level ||
1171 sb->layout != refsb->layout ||
1172 sb->chunksize != refsb->chunksize) {
1173 printk(KERN_WARNING "md: %s has strangely different"
1174 " superblock to %s\n",
1175 bdevname(rdev->bdev,b),
1176 bdevname(refdev->bdev,b2));
1179 ev1 = le64_to_cpu(sb->events);
1180 ev2 = le64_to_cpu(refsb->events);
1188 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1190 rdev->size = rdev->sb_start / 2;
1191 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1193 rdev->size = le64_to_cpu(sb->data_size)/2;
1194 if (le32_to_cpu(sb->chunksize))
1195 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1197 if (le64_to_cpu(sb->size) > rdev->size*2)
1202 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1204 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1205 __u64 ev1 = le64_to_cpu(sb->events);
1207 rdev->raid_disk = -1;
1208 clear_bit(Faulty, &rdev->flags);
1209 clear_bit(In_sync, &rdev->flags);
1210 clear_bit(WriteMostly, &rdev->flags);
1211 clear_bit(BarriersNotsupp, &rdev->flags);
1213 if (mddev->raid_disks == 0) {
1214 mddev->major_version = 1;
1215 mddev->patch_version = 0;
1216 mddev->external = 0;
1217 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1218 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1219 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1220 mddev->level = le32_to_cpu(sb->level);
1221 mddev->clevel[0] = 0;
1222 mddev->layout = le32_to_cpu(sb->layout);
1223 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1224 mddev->size = le64_to_cpu(sb->size)/2;
1225 mddev->events = ev1;
1226 mddev->bitmap_offset = 0;
1227 mddev->default_bitmap_offset = 1024 >> 9;
1229 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1230 memcpy(mddev->uuid, sb->set_uuid, 16);
1232 mddev->max_disks = (4096-256)/2;
1234 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1235 mddev->bitmap_file == NULL )
1236 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1238 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1239 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1240 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1241 mddev->new_level = le32_to_cpu(sb->new_level);
1242 mddev->new_layout = le32_to_cpu(sb->new_layout);
1243 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1245 mddev->reshape_position = MaxSector;
1246 mddev->delta_disks = 0;
1247 mddev->new_level = mddev->level;
1248 mddev->new_layout = mddev->layout;
1249 mddev->new_chunk = mddev->chunk_size;
1252 } else if (mddev->pers == NULL) {
1253 /* Insist of good event counter while assembling */
1255 if (ev1 < mddev->events)
1257 } else if (mddev->bitmap) {
1258 /* If adding to array with a bitmap, then we can accept an
1259 * older device, but not too old.
1261 if (ev1 < mddev->bitmap->events_cleared)
1264 if (ev1 < mddev->events)
1265 /* just a hot-add of a new device, leave raid_disk at -1 */
1268 if (mddev->level != LEVEL_MULTIPATH) {
1270 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1272 case 0xffff: /* spare */
1274 case 0xfffe: /* faulty */
1275 set_bit(Faulty, &rdev->flags);
1278 if ((le32_to_cpu(sb->feature_map) &
1279 MD_FEATURE_RECOVERY_OFFSET))
1280 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1282 set_bit(In_sync, &rdev->flags);
1283 rdev->raid_disk = role;
1286 if (sb->devflags & WriteMostly1)
1287 set_bit(WriteMostly, &rdev->flags);
1288 } else /* MULTIPATH are always insync */
1289 set_bit(In_sync, &rdev->flags);
1294 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1296 struct mdp_superblock_1 *sb;
1299 /* make rdev->sb match mddev and rdev data. */
1301 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1303 sb->feature_map = 0;
1305 sb->recovery_offset = cpu_to_le64(0);
1306 memset(sb->pad1, 0, sizeof(sb->pad1));
1307 memset(sb->pad2, 0, sizeof(sb->pad2));
1308 memset(sb->pad3, 0, sizeof(sb->pad3));
1310 sb->utime = cpu_to_le64((__u64)mddev->utime);
1311 sb->events = cpu_to_le64(mddev->events);
1313 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1315 sb->resync_offset = cpu_to_le64(0);
1317 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1319 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1320 sb->size = cpu_to_le64(mddev->size<<1);
1322 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1323 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1324 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1327 if (rdev->raid_disk >= 0 &&
1328 !test_bit(In_sync, &rdev->flags) &&
1329 rdev->recovery_offset > 0) {
1330 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1331 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1334 if (mddev->reshape_position != MaxSector) {
1335 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1336 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1337 sb->new_layout = cpu_to_le32(mddev->new_layout);
1338 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1339 sb->new_level = cpu_to_le32(mddev->new_level);
1340 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1344 list_for_each_entry(rdev2, &mddev->disks, same_set)
1345 if (rdev2->desc_nr+1 > max_dev)
1346 max_dev = rdev2->desc_nr+1;
1348 if (max_dev > le32_to_cpu(sb->max_dev))
1349 sb->max_dev = cpu_to_le32(max_dev);
1350 for (i=0; i<max_dev;i++)
1351 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1353 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1355 if (test_bit(Faulty, &rdev2->flags))
1356 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1357 else if (test_bit(In_sync, &rdev2->flags))
1358 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1359 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1360 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1362 sb->dev_roles[i] = cpu_to_le16(0xffff);
1365 sb->sb_csum = calc_sb_1_csum(sb);
1368 static unsigned long long
1369 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1371 struct mdp_superblock_1 *sb;
1372 sector_t max_sectors;
1373 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1374 return 0; /* component must fit device */
1375 if (rdev->sb_start < rdev->data_offset) {
1376 /* minor versions 1 and 2; superblock before data */
1377 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1378 max_sectors -= rdev->data_offset;
1379 if (!num_sectors || num_sectors > max_sectors)
1380 num_sectors = max_sectors;
1381 } else if (rdev->mddev->bitmap_offset) {
1382 /* minor version 0 with bitmap we can't move */
1385 /* minor version 0; superblock after data */
1387 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1388 sb_start &= ~(sector_t)(4*2 - 1);
1389 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1390 if (!num_sectors || num_sectors > max_sectors)
1391 num_sectors = max_sectors;
1392 rdev->sb_start = sb_start;
1394 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1395 sb->data_size = cpu_to_le64(num_sectors);
1396 sb->super_offset = rdev->sb_start;
1397 sb->sb_csum = calc_sb_1_csum(sb);
1398 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1400 md_super_wait(rdev->mddev);
1401 return num_sectors / 2; /* kB for sysfs */
1404 static struct super_type super_types[] = {
1407 .owner = THIS_MODULE,
1408 .load_super = super_90_load,
1409 .validate_super = super_90_validate,
1410 .sync_super = super_90_sync,
1411 .rdev_size_change = super_90_rdev_size_change,
1415 .owner = THIS_MODULE,
1416 .load_super = super_1_load,
1417 .validate_super = super_1_validate,
1418 .sync_super = super_1_sync,
1419 .rdev_size_change = super_1_rdev_size_change,
1423 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1425 mdk_rdev_t *rdev, *rdev2;
1428 rdev_for_each_rcu(rdev, mddev1)
1429 rdev_for_each_rcu(rdev2, mddev2)
1430 if (rdev->bdev->bd_contains ==
1431 rdev2->bdev->bd_contains) {
1439 static LIST_HEAD(pending_raid_disks);
1441 static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev)
1443 struct mdk_personality *pers = mddev->pers;
1444 struct gendisk *disk = mddev->gendisk;
1445 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1446 struct blk_integrity *bi_mddev = blk_get_integrity(disk);
1448 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1449 if (pers && pers->level >= 4 && pers->level <= 6)
1452 /* If rdev is integrity capable, register profile for mddev */
1453 if (!bi_mddev && bi_rdev) {
1454 if (blk_integrity_register(disk, bi_rdev))
1455 printk(KERN_ERR "%s: %s Could not register integrity!\n",
1456 __func__, disk->disk_name);
1458 printk(KERN_NOTICE "Enabling data integrity on %s\n",
1463 /* Check that mddev and rdev have matching profiles */
1464 if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) {
1465 printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__,
1466 disk->disk_name, rdev->bdev->bd_disk->disk_name);
1467 printk(KERN_NOTICE "Disabling data integrity on %s\n",
1469 blk_integrity_unregister(disk);
1473 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1475 char b[BDEVNAME_SIZE];
1485 /* prevent duplicates */
1486 if (find_rdev(mddev, rdev->bdev->bd_dev))
1489 /* make sure rdev->size exceeds mddev->size */
1490 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1492 /* Cannot change size, so fail
1493 * If mddev->level <= 0, then we don't care
1494 * about aligning sizes (e.g. linear)
1496 if (mddev->level > 0)
1499 mddev->size = rdev->size;
1502 /* Verify rdev->desc_nr is unique.
1503 * If it is -1, assign a free number, else
1504 * check number is not in use
1506 if (rdev->desc_nr < 0) {
1508 if (mddev->pers) choice = mddev->raid_disks;
1509 while (find_rdev_nr(mddev, choice))
1511 rdev->desc_nr = choice;
1513 if (find_rdev_nr(mddev, rdev->desc_nr))
1516 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1517 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1518 mdname(mddev), mddev->max_disks);
1521 bdevname(rdev->bdev,b);
1522 while ( (s=strchr(b, '/')) != NULL)
1525 rdev->mddev = mddev;
1526 printk(KERN_INFO "md: bind<%s>\n", b);
1528 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1531 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1532 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1533 kobject_del(&rdev->kobj);
1536 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1538 list_add_rcu(&rdev->same_set, &mddev->disks);
1539 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1541 /* May as well allow recovery to be retried once */
1542 mddev->recovery_disabled = 0;
1544 md_integrity_check(rdev, mddev);
1548 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1553 static void md_delayed_delete(struct work_struct *ws)
1555 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1556 kobject_del(&rdev->kobj);
1557 kobject_put(&rdev->kobj);
1560 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1562 char b[BDEVNAME_SIZE];
1567 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1568 list_del_rcu(&rdev->same_set);
1569 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1571 sysfs_remove_link(&rdev->kobj, "block");
1572 sysfs_put(rdev->sysfs_state);
1573 rdev->sysfs_state = NULL;
1574 /* We need to delay this, otherwise we can deadlock when
1575 * writing to 'remove' to "dev/state". We also need
1576 * to delay it due to rcu usage.
1579 INIT_WORK(&rdev->del_work, md_delayed_delete);
1580 kobject_get(&rdev->kobj);
1581 schedule_work(&rdev->del_work);
1585 * prevent the device from being mounted, repartitioned or
1586 * otherwise reused by a RAID array (or any other kernel
1587 * subsystem), by bd_claiming the device.
1589 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1592 struct block_device *bdev;
1593 char b[BDEVNAME_SIZE];
1595 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1597 printk(KERN_ERR "md: could not open %s.\n",
1598 __bdevname(dev, b));
1599 return PTR_ERR(bdev);
1601 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1603 printk(KERN_ERR "md: could not bd_claim %s.\n",
1605 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1609 set_bit(AllReserved, &rdev->flags);
1614 static void unlock_rdev(mdk_rdev_t *rdev)
1616 struct block_device *bdev = rdev->bdev;
1621 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1624 void md_autodetect_dev(dev_t dev);
1626 static void export_rdev(mdk_rdev_t * rdev)
1628 char b[BDEVNAME_SIZE];
1629 printk(KERN_INFO "md: export_rdev(%s)\n",
1630 bdevname(rdev->bdev,b));
1635 if (test_bit(AutoDetected, &rdev->flags))
1636 md_autodetect_dev(rdev->bdev->bd_dev);
1639 kobject_put(&rdev->kobj);
1642 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1644 unbind_rdev_from_array(rdev);
1648 static void export_array(mddev_t *mddev)
1650 mdk_rdev_t *rdev, *tmp;
1652 rdev_for_each(rdev, tmp, mddev) {
1657 kick_rdev_from_array(rdev);
1659 if (!list_empty(&mddev->disks))
1661 mddev->raid_disks = 0;
1662 mddev->major_version = 0;
1665 static void print_desc(mdp_disk_t *desc)
1667 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1668 desc->major,desc->minor,desc->raid_disk,desc->state);
1671 static void print_sb_90(mdp_super_t *sb)
1676 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1677 sb->major_version, sb->minor_version, sb->patch_version,
1678 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1680 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1681 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1682 sb->md_minor, sb->layout, sb->chunk_size);
1683 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1684 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1685 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1686 sb->failed_disks, sb->spare_disks,
1687 sb->sb_csum, (unsigned long)sb->events_lo);
1690 for (i = 0; i < MD_SB_DISKS; i++) {
1693 desc = sb->disks + i;
1694 if (desc->number || desc->major || desc->minor ||
1695 desc->raid_disk || (desc->state && (desc->state != 4))) {
1696 printk(" D %2d: ", i);
1700 printk(KERN_INFO "md: THIS: ");
1701 print_desc(&sb->this_disk);
1704 static void print_sb_1(struct mdp_superblock_1 *sb)
1708 uuid = sb->set_uuid;
1709 printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1710 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1711 KERN_INFO "md: Name: \"%s\" CT:%llu\n",
1712 le32_to_cpu(sb->major_version),
1713 le32_to_cpu(sb->feature_map),
1714 uuid[0], uuid[1], uuid[2], uuid[3],
1715 uuid[4], uuid[5], uuid[6], uuid[7],
1716 uuid[8], uuid[9], uuid[10], uuid[11],
1717 uuid[12], uuid[13], uuid[14], uuid[15],
1719 (unsigned long long)le64_to_cpu(sb->ctime)
1720 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1722 uuid = sb->device_uuid;
1723 printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1725 KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1726 ":%02x%02x%02x%02x%02x%02x\n"
1727 KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1728 KERN_INFO "md: (MaxDev:%u) \n",
1729 le32_to_cpu(sb->level),
1730 (unsigned long long)le64_to_cpu(sb->size),
1731 le32_to_cpu(sb->raid_disks),
1732 le32_to_cpu(sb->layout),
1733 le32_to_cpu(sb->chunksize),
1734 (unsigned long long)le64_to_cpu(sb->data_offset),
1735 (unsigned long long)le64_to_cpu(sb->data_size),
1736 (unsigned long long)le64_to_cpu(sb->super_offset),
1737 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1738 le32_to_cpu(sb->dev_number),
1739 uuid[0], uuid[1], uuid[2], uuid[3],
1740 uuid[4], uuid[5], uuid[6], uuid[7],
1741 uuid[8], uuid[9], uuid[10], uuid[11],
1742 uuid[12], uuid[13], uuid[14], uuid[15],
1744 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1745 (unsigned long long)le64_to_cpu(sb->events),
1746 (unsigned long long)le64_to_cpu(sb->resync_offset),
1747 le32_to_cpu(sb->sb_csum),
1748 le32_to_cpu(sb->max_dev)
1752 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1754 char b[BDEVNAME_SIZE];
1755 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1756 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1757 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1759 if (rdev->sb_loaded) {
1760 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1761 switch (major_version) {
1763 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1766 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1770 printk(KERN_INFO "md: no rdev superblock!\n");
1773 static void md_print_devices(void)
1775 struct list_head *tmp;
1778 char b[BDEVNAME_SIZE];
1781 printk("md: **********************************\n");
1782 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1783 printk("md: **********************************\n");
1784 for_each_mddev(mddev, tmp) {
1787 bitmap_print_sb(mddev->bitmap);
1789 printk("%s: ", mdname(mddev));
1790 list_for_each_entry(rdev, &mddev->disks, same_set)
1791 printk("<%s>", bdevname(rdev->bdev,b));
1794 list_for_each_entry(rdev, &mddev->disks, same_set)
1795 print_rdev(rdev, mddev->major_version);
1797 printk("md: **********************************\n");
1802 static void sync_sbs(mddev_t * mddev, int nospares)
1804 /* Update each superblock (in-memory image), but
1805 * if we are allowed to, skip spares which already
1806 * have the right event counter, or have one earlier
1807 * (which would mean they aren't being marked as dirty
1808 * with the rest of the array)
1812 list_for_each_entry(rdev, &mddev->disks, same_set) {
1813 if (rdev->sb_events == mddev->events ||
1815 rdev->raid_disk < 0 &&
1816 (rdev->sb_events&1)==0 &&
1817 rdev->sb_events+1 == mddev->events)) {
1818 /* Don't update this superblock */
1819 rdev->sb_loaded = 2;
1821 super_types[mddev->major_version].
1822 sync_super(mddev, rdev);
1823 rdev->sb_loaded = 1;
1828 static void md_update_sb(mddev_t * mddev, int force_change)
1834 if (mddev->external)
1837 spin_lock_irq(&mddev->write_lock);
1839 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1840 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1842 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1843 /* just a clean<-> dirty transition, possibly leave spares alone,
1844 * though if events isn't the right even/odd, we will have to do
1850 if (mddev->degraded)
1851 /* If the array is degraded, then skipping spares is both
1852 * dangerous and fairly pointless.
1853 * Dangerous because a device that was removed from the array
1854 * might have a event_count that still looks up-to-date,
1855 * so it can be re-added without a resync.
1856 * Pointless because if there are any spares to skip,
1857 * then a recovery will happen and soon that array won't
1858 * be degraded any more and the spare can go back to sleep then.
1862 sync_req = mddev->in_sync;
1863 mddev->utime = get_seconds();
1865 /* If this is just a dirty<->clean transition, and the array is clean
1866 * and 'events' is odd, we can roll back to the previous clean state */
1868 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1869 && (mddev->events & 1)
1870 && mddev->events != 1)
1873 /* otherwise we have to go forward and ... */
1875 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1876 /* .. if the array isn't clean, insist on an odd 'events' */
1877 if ((mddev->events&1)==0) {
1882 /* otherwise insist on an even 'events' (for clean states) */
1883 if ((mddev->events&1)) {
1890 if (!mddev->events) {
1892 * oops, this 64-bit counter should never wrap.
1893 * Either we are in around ~1 trillion A.C., assuming
1894 * 1 reboot per second, or we have a bug:
1901 * do not write anything to disk if using
1902 * nonpersistent superblocks
1904 if (!mddev->persistent) {
1905 if (!mddev->external)
1906 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1908 spin_unlock_irq(&mddev->write_lock);
1909 wake_up(&mddev->sb_wait);
1912 sync_sbs(mddev, nospares);
1913 spin_unlock_irq(&mddev->write_lock);
1916 "md: updating %s RAID superblock on device (in sync %d)\n",
1917 mdname(mddev),mddev->in_sync);
1919 bitmap_update_sb(mddev->bitmap);
1920 list_for_each_entry(rdev, &mddev->disks, same_set) {
1921 char b[BDEVNAME_SIZE];
1922 dprintk(KERN_INFO "md: ");
1923 if (rdev->sb_loaded != 1)
1924 continue; /* no noise on spare devices */
1925 if (test_bit(Faulty, &rdev->flags))
1926 dprintk("(skipping faulty ");
1928 dprintk("%s ", bdevname(rdev->bdev,b));
1929 if (!test_bit(Faulty, &rdev->flags)) {
1930 md_super_write(mddev,rdev,
1931 rdev->sb_start, rdev->sb_size,
1933 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1934 bdevname(rdev->bdev,b),
1935 (unsigned long long)rdev->sb_start);
1936 rdev->sb_events = mddev->events;
1940 if (mddev->level == LEVEL_MULTIPATH)
1941 /* only need to write one superblock... */
1944 md_super_wait(mddev);
1945 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1947 spin_lock_irq(&mddev->write_lock);
1948 if (mddev->in_sync != sync_req ||
1949 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1950 /* have to write it out again */
1951 spin_unlock_irq(&mddev->write_lock);
1954 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1955 spin_unlock_irq(&mddev->write_lock);
1956 wake_up(&mddev->sb_wait);
1960 /* words written to sysfs files may, or may not, be \n terminated.
1961 * We want to accept with case. For this we use cmd_match.
1963 static int cmd_match(const char *cmd, const char *str)
1965 /* See if cmd, written into a sysfs file, matches
1966 * str. They must either be the same, or cmd can
1967 * have a trailing newline
1969 while (*cmd && *str && *cmd == *str) {
1980 struct rdev_sysfs_entry {
1981 struct attribute attr;
1982 ssize_t (*show)(mdk_rdev_t *, char *);
1983 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1987 state_show(mdk_rdev_t *rdev, char *page)
1992 if (test_bit(Faulty, &rdev->flags)) {
1993 len+= sprintf(page+len, "%sfaulty",sep);
1996 if (test_bit(In_sync, &rdev->flags)) {
1997 len += sprintf(page+len, "%sin_sync",sep);
2000 if (test_bit(WriteMostly, &rdev->flags)) {
2001 len += sprintf(page+len, "%swrite_mostly",sep);
2004 if (test_bit(Blocked, &rdev->flags)) {
2005 len += sprintf(page+len, "%sblocked", sep);
2008 if (!test_bit(Faulty, &rdev->flags) &&
2009 !test_bit(In_sync, &rdev->flags)) {
2010 len += sprintf(page+len, "%sspare", sep);
2013 return len+sprintf(page+len, "\n");
2017 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2020 * faulty - simulates and error
2021 * remove - disconnects the device
2022 * writemostly - sets write_mostly
2023 * -writemostly - clears write_mostly
2024 * blocked - sets the Blocked flag
2025 * -blocked - clears the Blocked flag
2028 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2029 md_error(rdev->mddev, rdev);
2031 } else if (cmd_match(buf, "remove")) {
2032 if (rdev->raid_disk >= 0)
2035 mddev_t *mddev = rdev->mddev;
2036 kick_rdev_from_array(rdev);
2038 md_update_sb(mddev, 1);
2039 md_new_event(mddev);
2042 } else if (cmd_match(buf, "writemostly")) {
2043 set_bit(WriteMostly, &rdev->flags);
2045 } else if (cmd_match(buf, "-writemostly")) {
2046 clear_bit(WriteMostly, &rdev->flags);
2048 } else if (cmd_match(buf, "blocked")) {
2049 set_bit(Blocked, &rdev->flags);
2051 } else if (cmd_match(buf, "-blocked")) {
2052 clear_bit(Blocked, &rdev->flags);
2053 wake_up(&rdev->blocked_wait);
2054 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2055 md_wakeup_thread(rdev->mddev->thread);
2059 if (!err && rdev->sysfs_state)
2060 sysfs_notify_dirent(rdev->sysfs_state);
2061 return err ? err : len;
2063 static struct rdev_sysfs_entry rdev_state =
2064 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2067 errors_show(mdk_rdev_t *rdev, char *page)
2069 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2073 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2076 unsigned long n = simple_strtoul(buf, &e, 10);
2077 if (*buf && (*e == 0 || *e == '\n')) {
2078 atomic_set(&rdev->corrected_errors, n);
2083 static struct rdev_sysfs_entry rdev_errors =
2084 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2087 slot_show(mdk_rdev_t *rdev, char *page)
2089 if (rdev->raid_disk < 0)
2090 return sprintf(page, "none\n");
2092 return sprintf(page, "%d\n", rdev->raid_disk);
2096 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2101 int slot = simple_strtoul(buf, &e, 10);
2102 if (strncmp(buf, "none", 4)==0)
2104 else if (e==buf || (*e && *e!= '\n'))
2106 if (rdev->mddev->pers && slot == -1) {
2107 /* Setting 'slot' on an active array requires also
2108 * updating the 'rd%d' link, and communicating
2109 * with the personality with ->hot_*_disk.
2110 * For now we only support removing
2111 * failed/spare devices. This normally happens automatically,
2112 * but not when the metadata is externally managed.
2114 if (rdev->raid_disk == -1)
2116 /* personality does all needed checks */
2117 if (rdev->mddev->pers->hot_add_disk == NULL)
2119 err = rdev->mddev->pers->
2120 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2123 sprintf(nm, "rd%d", rdev->raid_disk);
2124 sysfs_remove_link(&rdev->mddev->kobj, nm);
2125 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2126 md_wakeup_thread(rdev->mddev->thread);
2127 } else if (rdev->mddev->pers) {
2129 /* Activating a spare .. or possibly reactivating
2130 * if we every get bitmaps working here.
2133 if (rdev->raid_disk != -1)
2136 if (rdev->mddev->pers->hot_add_disk == NULL)
2139 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2140 if (rdev2->raid_disk == slot)
2143 rdev->raid_disk = slot;
2144 if (test_bit(In_sync, &rdev->flags))
2145 rdev->saved_raid_disk = slot;
2147 rdev->saved_raid_disk = -1;
2148 err = rdev->mddev->pers->
2149 hot_add_disk(rdev->mddev, rdev);
2151 rdev->raid_disk = -1;
2154 sysfs_notify_dirent(rdev->sysfs_state);
2155 sprintf(nm, "rd%d", rdev->raid_disk);
2156 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2158 "md: cannot register "
2160 nm, mdname(rdev->mddev));
2162 /* don't wakeup anyone, leave that to userspace. */
2164 if (slot >= rdev->mddev->raid_disks)
2166 rdev->raid_disk = slot;
2167 /* assume it is working */
2168 clear_bit(Faulty, &rdev->flags);
2169 clear_bit(WriteMostly, &rdev->flags);
2170 set_bit(In_sync, &rdev->flags);
2171 sysfs_notify_dirent(rdev->sysfs_state);
2177 static struct rdev_sysfs_entry rdev_slot =
2178 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2181 offset_show(mdk_rdev_t *rdev, char *page)
2183 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2187 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2190 unsigned long long offset = simple_strtoull(buf, &e, 10);
2191 if (e==buf || (*e && *e != '\n'))
2193 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2195 if (rdev->size && rdev->mddev->external)
2196 /* Must set offset before size, so overlap checks
2199 rdev->data_offset = offset;
2203 static struct rdev_sysfs_entry rdev_offset =
2204 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2207 rdev_size_show(mdk_rdev_t *rdev, char *page)
2209 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2212 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2214 /* check if two start/length pairs overlap */
2223 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2225 unsigned long long size;
2226 unsigned long long oldsize = rdev->size;
2227 mddev_t *my_mddev = rdev->mddev;
2229 if (strict_strtoull(buf, 10, &size) < 0)
2231 if (my_mddev->pers && rdev->raid_disk >= 0) {
2232 if (my_mddev->persistent) {
2233 size = super_types[my_mddev->major_version].
2234 rdev_size_change(rdev, size * 2);
2238 size = (rdev->bdev->bd_inode->i_size >> 10);
2239 size -= rdev->data_offset/2;
2242 if (size < my_mddev->size)
2243 return -EINVAL; /* component must fit device */
2246 if (size > oldsize && my_mddev->external) {
2247 /* need to check that all other rdevs with the same ->bdev
2248 * do not overlap. We need to unlock the mddev to avoid
2249 * a deadlock. We have already changed rdev->size, and if
2250 * we have to change it back, we will have the lock again.
2254 struct list_head *tmp;
2256 mddev_unlock(my_mddev);
2257 for_each_mddev(mddev, tmp) {
2261 list_for_each_entry(rdev2, &mddev->disks, same_set)
2262 if (test_bit(AllReserved, &rdev2->flags) ||
2263 (rdev->bdev == rdev2->bdev &&
2265 overlaps(rdev->data_offset, rdev->size * 2,
2267 rdev2->size * 2))) {
2271 mddev_unlock(mddev);
2277 mddev_lock(my_mddev);
2279 /* Someone else could have slipped in a size
2280 * change here, but doing so is just silly.
2281 * We put oldsize back because we *know* it is
2282 * safe, and trust userspace not to race with
2285 rdev->size = oldsize;
2292 static struct rdev_sysfs_entry rdev_size =
2293 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2295 static struct attribute *rdev_default_attrs[] = {
2304 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2306 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2307 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2308 mddev_t *mddev = rdev->mddev;
2314 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2316 if (rdev->mddev == NULL)
2319 rv = entry->show(rdev, page);
2320 mddev_unlock(mddev);
2326 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2327 const char *page, size_t length)
2329 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2330 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2332 mddev_t *mddev = rdev->mddev;
2336 if (!capable(CAP_SYS_ADMIN))
2338 rv = mddev ? mddev_lock(mddev): -EBUSY;
2340 if (rdev->mddev == NULL)
2343 rv = entry->store(rdev, page, length);
2344 mddev_unlock(mddev);
2349 static void rdev_free(struct kobject *ko)
2351 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2354 static struct sysfs_ops rdev_sysfs_ops = {
2355 .show = rdev_attr_show,
2356 .store = rdev_attr_store,
2358 static struct kobj_type rdev_ktype = {
2359 .release = rdev_free,
2360 .sysfs_ops = &rdev_sysfs_ops,
2361 .default_attrs = rdev_default_attrs,
2365 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2367 * mark the device faulty if:
2369 * - the device is nonexistent (zero size)
2370 * - the device has no valid superblock
2372 * a faulty rdev _never_ has rdev->sb set.
2374 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2376 char b[BDEVNAME_SIZE];
2381 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2383 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2384 return ERR_PTR(-ENOMEM);
2387 if ((err = alloc_disk_sb(rdev)))
2390 err = lock_rdev(rdev, newdev, super_format == -2);
2394 kobject_init(&rdev->kobj, &rdev_ktype);
2397 rdev->saved_raid_disk = -1;
2398 rdev->raid_disk = -1;
2400 rdev->data_offset = 0;
2401 rdev->sb_events = 0;
2402 atomic_set(&rdev->nr_pending, 0);
2403 atomic_set(&rdev->read_errors, 0);
2404 atomic_set(&rdev->corrected_errors, 0);
2406 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2409 "md: %s has zero or unknown size, marking faulty!\n",
2410 bdevname(rdev->bdev,b));
2415 if (super_format >= 0) {
2416 err = super_types[super_format].
2417 load_super(rdev, NULL, super_minor);
2418 if (err == -EINVAL) {
2420 "md: %s does not have a valid v%d.%d "
2421 "superblock, not importing!\n",
2422 bdevname(rdev->bdev,b),
2423 super_format, super_minor);
2428 "md: could not read %s's sb, not importing!\n",
2429 bdevname(rdev->bdev,b));
2434 INIT_LIST_HEAD(&rdev->same_set);
2435 init_waitqueue_head(&rdev->blocked_wait);
2440 if (rdev->sb_page) {
2446 return ERR_PTR(err);
2450 * Check a full RAID array for plausibility
2454 static void analyze_sbs(mddev_t * mddev)
2457 mdk_rdev_t *rdev, *freshest, *tmp;
2458 char b[BDEVNAME_SIZE];
2461 rdev_for_each(rdev, tmp, mddev)
2462 switch (super_types[mddev->major_version].
2463 load_super(rdev, freshest, mddev->minor_version)) {
2471 "md: fatal superblock inconsistency in %s"
2472 " -- removing from array\n",
2473 bdevname(rdev->bdev,b));
2474 kick_rdev_from_array(rdev);
2478 super_types[mddev->major_version].
2479 validate_super(mddev, freshest);
2482 rdev_for_each(rdev, tmp, mddev) {
2483 if (rdev->desc_nr >= mddev->max_disks ||
2484 i > mddev->max_disks) {
2486 "md: %s: %s: only %d devices permitted\n",
2487 mdname(mddev), bdevname(rdev->bdev, b),
2489 kick_rdev_from_array(rdev);
2492 if (rdev != freshest)
2493 if (super_types[mddev->major_version].
2494 validate_super(mddev, rdev)) {
2495 printk(KERN_WARNING "md: kicking non-fresh %s"
2497 bdevname(rdev->bdev,b));
2498 kick_rdev_from_array(rdev);
2501 if (mddev->level == LEVEL_MULTIPATH) {
2502 rdev->desc_nr = i++;
2503 rdev->raid_disk = rdev->desc_nr;
2504 set_bit(In_sync, &rdev->flags);
2505 } else if (rdev->raid_disk >= mddev->raid_disks) {
2506 rdev->raid_disk = -1;
2507 clear_bit(In_sync, &rdev->flags);
2513 if (mddev->recovery_cp != MaxSector &&
2515 printk(KERN_ERR "md: %s: raid array is not clean"
2516 " -- starting background reconstruction\n",
2521 static void md_safemode_timeout(unsigned long data);
2524 safe_delay_show(mddev_t *mddev, char *page)
2526 int msec = (mddev->safemode_delay*1000)/HZ;
2527 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2530 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2538 /* remove a period, and count digits after it */
2539 if (len >= sizeof(buf))
2541 strlcpy(buf, cbuf, sizeof(buf));
2542 for (i=0; i<len; i++) {
2544 if (isdigit(buf[i])) {
2549 } else if (buf[i] == '.') {
2554 if (strict_strtoul(buf, 10, &msec) < 0)
2556 msec = (msec * 1000) / scale;
2558 mddev->safemode_delay = 0;
2560 unsigned long old_delay = mddev->safemode_delay;
2561 mddev->safemode_delay = (msec*HZ)/1000;
2562 if (mddev->safemode_delay == 0)
2563 mddev->safemode_delay = 1;
2564 if (mddev->safemode_delay < old_delay)
2565 md_safemode_timeout((unsigned long)mddev);
2569 static struct md_sysfs_entry md_safe_delay =
2570 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2573 level_show(mddev_t *mddev, char *page)
2575 struct mdk_personality *p = mddev->pers;
2577 return sprintf(page, "%s\n", p->name);
2578 else if (mddev->clevel[0])
2579 return sprintf(page, "%s\n", mddev->clevel);
2580 else if (mddev->level != LEVEL_NONE)
2581 return sprintf(page, "%d\n", mddev->level);
2587 level_store(mddev_t *mddev, const char *buf, size_t len)
2594 if (len >= sizeof(mddev->clevel))
2596 strncpy(mddev->clevel, buf, len);
2597 if (mddev->clevel[len-1] == '\n')
2599 mddev->clevel[len] = 0;
2600 mddev->level = LEVEL_NONE;
2604 static struct md_sysfs_entry md_level =
2605 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2609 layout_show(mddev_t *mddev, char *page)
2611 /* just a number, not meaningful for all levels */
2612 if (mddev->reshape_position != MaxSector &&
2613 mddev->layout != mddev->new_layout)
2614 return sprintf(page, "%d (%d)\n",
2615 mddev->new_layout, mddev->layout);
2616 return sprintf(page, "%d\n", mddev->layout);
2620 layout_store(mddev_t *mddev, const char *buf, size_t len)
2623 unsigned long n = simple_strtoul(buf, &e, 10);
2625 if (!*buf || (*e && *e != '\n'))
2630 if (mddev->reshape_position != MaxSector)
2631 mddev->new_layout = n;
2636 static struct md_sysfs_entry md_layout =
2637 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2641 raid_disks_show(mddev_t *mddev, char *page)
2643 if (mddev->raid_disks == 0)
2645 if (mddev->reshape_position != MaxSector &&
2646 mddev->delta_disks != 0)
2647 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2648 mddev->raid_disks - mddev->delta_disks);
2649 return sprintf(page, "%d\n", mddev->raid_disks);
2652 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2655 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2659 unsigned long n = simple_strtoul(buf, &e, 10);
2661 if (!*buf || (*e && *e != '\n'))
2665 rv = update_raid_disks(mddev, n);
2666 else if (mddev->reshape_position != MaxSector) {
2667 int olddisks = mddev->raid_disks - mddev->delta_disks;
2668 mddev->delta_disks = n - olddisks;
2669 mddev->raid_disks = n;
2671 mddev->raid_disks = n;
2672 return rv ? rv : len;
2674 static struct md_sysfs_entry md_raid_disks =
2675 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2678 chunk_size_show(mddev_t *mddev, char *page)
2680 if (mddev->reshape_position != MaxSector &&
2681 mddev->chunk_size != mddev->new_chunk)
2682 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2684 return sprintf(page, "%d\n", mddev->chunk_size);
2688 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2690 /* can only set chunk_size if array is not yet active */
2692 unsigned long n = simple_strtoul(buf, &e, 10);
2694 if (!*buf || (*e && *e != '\n'))
2699 else if (mddev->reshape_position != MaxSector)
2700 mddev->new_chunk = n;
2702 mddev->chunk_size = n;
2705 static struct md_sysfs_entry md_chunk_size =
2706 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2709 resync_start_show(mddev_t *mddev, char *page)
2711 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2715 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2718 unsigned long long n = simple_strtoull(buf, &e, 10);
2722 if (!*buf || (*e && *e != '\n'))
2725 mddev->recovery_cp = n;
2728 static struct md_sysfs_entry md_resync_start =
2729 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2732 * The array state can be:
2735 * No devices, no size, no level
2736 * Equivalent to STOP_ARRAY ioctl
2738 * May have some settings, but array is not active
2739 * all IO results in error
2740 * When written, doesn't tear down array, but just stops it
2741 * suspended (not supported yet)
2742 * All IO requests will block. The array can be reconfigured.
2743 * Writing this, if accepted, will block until array is quiescent
2745 * no resync can happen. no superblocks get written.
2746 * write requests fail
2748 * like readonly, but behaves like 'clean' on a write request.
2750 * clean - no pending writes, but otherwise active.
2751 * When written to inactive array, starts without resync
2752 * If a write request arrives then
2753 * if metadata is known, mark 'dirty' and switch to 'active'.
2754 * if not known, block and switch to write-pending
2755 * If written to an active array that has pending writes, then fails.
2757 * fully active: IO and resync can be happening.
2758 * When written to inactive array, starts with resync
2761 * clean, but writes are blocked waiting for 'active' to be written.
2764 * like active, but no writes have been seen for a while (100msec).
2767 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2768 write_pending, active_idle, bad_word};
2769 static char *array_states[] = {
2770 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2771 "write-pending", "active-idle", NULL };
2773 static int match_word(const char *word, char **list)
2776 for (n=0; list[n]; n++)
2777 if (cmd_match(word, list[n]))
2783 array_state_show(mddev_t *mddev, char *page)
2785 enum array_state st = inactive;
2798 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2800 else if (mddev->safemode)
2806 if (list_empty(&mddev->disks) &&
2807 mddev->raid_disks == 0 &&
2813 return sprintf(page, "%s\n", array_states[st]);
2816 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2817 static int do_md_run(mddev_t * mddev);
2818 static int restart_array(mddev_t *mddev);
2821 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2824 enum array_state st = match_word(buf, array_states);
2829 /* stopping an active array */
2830 if (atomic_read(&mddev->openers) > 0)
2832 err = do_md_stop(mddev, 0, 0);
2835 /* stopping an active array */
2837 if (atomic_read(&mddev->openers) > 0)
2839 err = do_md_stop(mddev, 2, 0);
2841 err = 0; /* already inactive */
2844 break; /* not supported yet */
2847 err = do_md_stop(mddev, 1, 0);
2850 set_disk_ro(mddev->gendisk, 1);
2851 err = do_md_run(mddev);
2857 err = do_md_stop(mddev, 1, 0);
2858 else if (mddev->ro == 1)
2859 err = restart_array(mddev);
2862 set_disk_ro(mddev->gendisk, 0);
2866 err = do_md_run(mddev);
2871 restart_array(mddev);
2872 spin_lock_irq(&mddev->write_lock);
2873 if (atomic_read(&mddev->writes_pending) == 0) {
2874 if (mddev->in_sync == 0) {
2876 if (mddev->safemode == 1)
2877 mddev->safemode = 0;
2878 if (mddev->persistent)
2879 set_bit(MD_CHANGE_CLEAN,
2885 spin_unlock_irq(&mddev->write_lock);
2888 mddev->recovery_cp = MaxSector;
2889 err = do_md_run(mddev);
2894 restart_array(mddev);
2895 if (mddev->external)
2896 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2897 wake_up(&mddev->sb_wait);
2901 set_disk_ro(mddev->gendisk, 0);
2902 err = do_md_run(mddev);
2907 /* these cannot be set */
2913 sysfs_notify_dirent(mddev->sysfs_state);
2917 static struct md_sysfs_entry md_array_state =
2918 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2921 null_show(mddev_t *mddev, char *page)
2927 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2929 /* buf must be %d:%d\n? giving major and minor numbers */
2930 /* The new device is added to the array.
2931 * If the array has a persistent superblock, we read the
2932 * superblock to initialise info and check validity.
2933 * Otherwise, only checking done is that in bind_rdev_to_array,
2934 * which mainly checks size.
2937 int major = simple_strtoul(buf, &e, 10);
2943 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2945 minor = simple_strtoul(e+1, &e, 10);
2946 if (*e && *e != '\n')
2948 dev = MKDEV(major, minor);
2949 if (major != MAJOR(dev) ||
2950 minor != MINOR(dev))
2954 if (mddev->persistent) {
2955 rdev = md_import_device(dev, mddev->major_version,
2956 mddev->minor_version);
2957 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2958 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2959 mdk_rdev_t, same_set);
2960 err = super_types[mddev->major_version]
2961 .load_super(rdev, rdev0, mddev->minor_version);
2965 } else if (mddev->external)
2966 rdev = md_import_device(dev, -2, -1);
2968 rdev = md_import_device(dev, -1, -1);
2971 return PTR_ERR(rdev);
2972 err = bind_rdev_to_array(rdev, mddev);
2976 return err ? err : len;
2979 static struct md_sysfs_entry md_new_device =
2980 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2983 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2986 unsigned long chunk, end_chunk;
2990 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2992 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2993 if (buf == end) break;
2994 if (*end == '-') { /* range */
2996 end_chunk = simple_strtoul(buf, &end, 0);
2997 if (buf == end) break;
2999 if (*end && !isspace(*end)) break;
3000 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3002 while (isspace(*buf)) buf++;
3004 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3009 static struct md_sysfs_entry md_bitmap =
3010 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3013 size_show(mddev_t *mddev, char *page)
3015 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
3018 static int update_size(mddev_t *mddev, sector_t num_sectors);
3021 size_store(mddev_t *mddev, const char *buf, size_t len)
3023 /* If array is inactive, we can reduce the component size, but
3024 * not increase it (except from 0).
3025 * If array is active, we can try an on-line resize
3029 unsigned long long size = simple_strtoull(buf, &e, 10);
3030 if (!*buf || *buf == '\n' ||
3035 err = update_size(mddev, size * 2);
3036 md_update_sb(mddev, 1);
3038 if (mddev->size == 0 ||
3044 return err ? err : len;
3047 static struct md_sysfs_entry md_size =
3048 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3053 * 'none' for arrays with no metadata (good luck...)
3054 * 'external' for arrays with externally managed metadata,
3055 * or N.M for internally known formats
3058 metadata_show(mddev_t *mddev, char *page)
3060 if (mddev->persistent)
3061 return sprintf(page, "%d.%d\n",
3062 mddev->major_version, mddev->minor_version);
3063 else if (mddev->external)
3064 return sprintf(page, "external:%s\n", mddev->metadata_type);
3066 return sprintf(page, "none\n");
3070 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3074 /* Changing the details of 'external' metadata is
3075 * always permitted. Otherwise there must be
3076 * no devices attached to the array.
3078 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3080 else if (!list_empty(&mddev->disks))
3083 if (cmd_match(buf, "none")) {
3084 mddev->persistent = 0;
3085 mddev->external = 0;
3086 mddev->major_version = 0;
3087 mddev->minor_version = 90;
3090 if (strncmp(buf, "external:", 9) == 0) {
3091 size_t namelen = len-9;
3092 if (namelen >= sizeof(mddev->metadata_type))
3093 namelen = sizeof(mddev->metadata_type)-1;
3094 strncpy(mddev->metadata_type, buf+9, namelen);
3095 mddev->metadata_type[namelen] = 0;
3096 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3097 mddev->metadata_type[--namelen] = 0;
3098 mddev->persistent = 0;
3099 mddev->external = 1;
3100 mddev->major_version = 0;
3101 mddev->minor_version = 90;
3104 major = simple_strtoul(buf, &e, 10);
3105 if (e==buf || *e != '.')
3108 minor = simple_strtoul(buf, &e, 10);
3109 if (e==buf || (*e && *e != '\n') )
3111 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3113 mddev->major_version = major;
3114 mddev->minor_version = minor;
3115 mddev->persistent = 1;
3116 mddev->external = 0;
3120 static struct md_sysfs_entry md_metadata =
3121 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3124 action_show(mddev_t *mddev, char *page)
3126 char *type = "idle";
3127 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3128 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3129 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3131 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3132 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3134 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3138 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3141 return sprintf(page, "%s\n", type);
3145 action_store(mddev_t *mddev, const char *page, size_t len)
3147 if (!mddev->pers || !mddev->pers->sync_request)
3150 if (cmd_match(page, "idle")) {
3151 if (mddev->sync_thread) {
3152 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3153 md_unregister_thread(mddev->sync_thread);
3154 mddev->sync_thread = NULL;
3155 mddev->recovery = 0;
3157 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3158 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3160 else if (cmd_match(page, "resync"))
3161 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3162 else if (cmd_match(page, "recover")) {
3163 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3164 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3165 } else if (cmd_match(page, "reshape")) {
3167 if (mddev->pers->start_reshape == NULL)
3169 err = mddev->pers->start_reshape(mddev);
3172 sysfs_notify(&mddev->kobj, NULL, "degraded");
3174 if (cmd_match(page, "check"))
3175 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3176 else if (!cmd_match(page, "repair"))
3178 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3179 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3181 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3182 md_wakeup_thread(mddev->thread);
3183 sysfs_notify_dirent(mddev->sysfs_action);
3188 mismatch_cnt_show(mddev_t *mddev, char *page)
3190 return sprintf(page, "%llu\n",
3191 (unsigned long long) mddev->resync_mismatches);
3194 static struct md_sysfs_entry md_scan_mode =
3195 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3198 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3201 sync_min_show(mddev_t *mddev, char *page)
3203 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3204 mddev->sync_speed_min ? "local": "system");
3208 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3212 if (strncmp(buf, "system", 6)==0) {
3213 mddev->sync_speed_min = 0;
3216 min = simple_strtoul(buf, &e, 10);
3217 if (buf == e || (*e && *e != '\n') || min <= 0)
3219 mddev->sync_speed_min = min;
3223 static struct md_sysfs_entry md_sync_min =
3224 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3227 sync_max_show(mddev_t *mddev, char *page)
3229 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3230 mddev->sync_speed_max ? "local": "system");
3234 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3238 if (strncmp(buf, "system", 6)==0) {
3239 mddev->sync_speed_max = 0;
3242 max = simple_strtoul(buf, &e, 10);
3243 if (buf == e || (*e && *e != '\n') || max <= 0)
3245 mddev->sync_speed_max = max;
3249 static struct md_sysfs_entry md_sync_max =
3250 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3253 degraded_show(mddev_t *mddev, char *page)
3255 return sprintf(page, "%d\n", mddev->degraded);
3257 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3260 sync_force_parallel_show(mddev_t *mddev, char *page)
3262 return sprintf(page, "%d\n", mddev->parallel_resync);
3266 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3270 if (strict_strtol(buf, 10, &n))
3273 if (n != 0 && n != 1)
3276 mddev->parallel_resync = n;
3278 if (mddev->sync_thread)
3279 wake_up(&resync_wait);
3284 /* force parallel resync, even with shared block devices */
3285 static struct md_sysfs_entry md_sync_force_parallel =
3286 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3287 sync_force_parallel_show, sync_force_parallel_store);
3290 sync_speed_show(mddev_t *mddev, char *page)
3292 unsigned long resync, dt, db;
3293 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3294 dt = (jiffies - mddev->resync_mark) / HZ;
3296 db = resync - mddev->resync_mark_cnt;
3297 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3300 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3303 sync_completed_show(mddev_t *mddev, char *page)
3305 unsigned long max_blocks, resync;
3307 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3308 max_blocks = mddev->resync_max_sectors;
3310 max_blocks = mddev->size << 1;
3312 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3313 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3316 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3319 min_sync_show(mddev_t *mddev, char *page)
3321 return sprintf(page, "%llu\n",
3322 (unsigned long long)mddev->resync_min);
3325 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3327 unsigned long long min;
3328 if (strict_strtoull(buf, 10, &min))
3330 if (min > mddev->resync_max)
3332 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3335 /* Must be a multiple of chunk_size */
3336 if (mddev->chunk_size) {
3337 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3340 mddev->resync_min = min;
3345 static struct md_sysfs_entry md_min_sync =
3346 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3349 max_sync_show(mddev_t *mddev, char *page)
3351 if (mddev->resync_max == MaxSector)
3352 return sprintf(page, "max\n");
3354 return sprintf(page, "%llu\n",
3355 (unsigned long long)mddev->resync_max);
3358 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3360 if (strncmp(buf, "max", 3) == 0)
3361 mddev->resync_max = MaxSector;
3363 unsigned long long max;
3364 if (strict_strtoull(buf, 10, &max))
3366 if (max < mddev->resync_min)
3368 if (max < mddev->resync_max &&
3369 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3372 /* Must be a multiple of chunk_size */
3373 if (mddev->chunk_size) {
3374 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3377 mddev->resync_max = max;
3379 wake_up(&mddev->recovery_wait);
3383 static struct md_sysfs_entry md_max_sync =
3384 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3387 suspend_lo_show(mddev_t *mddev, char *page)
3389 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3393 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3396 unsigned long long new = simple_strtoull(buf, &e, 10);
3398 if (mddev->pers->quiesce == NULL)
3400 if (buf == e || (*e && *e != '\n'))
3402 if (new >= mddev->suspend_hi ||
3403 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3404 mddev->suspend_lo = new;
3405 mddev->pers->quiesce(mddev, 2);
3410 static struct md_sysfs_entry md_suspend_lo =
3411 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3415 suspend_hi_show(mddev_t *mddev, char *page)
3417 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3421 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3424 unsigned long long new = simple_strtoull(buf, &e, 10);
3426 if (mddev->pers->quiesce == NULL)
3428 if (buf == e || (*e && *e != '\n'))
3430 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3431 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3432 mddev->suspend_hi = new;
3433 mddev->pers->quiesce(mddev, 1);
3434 mddev->pers->quiesce(mddev, 0);
3439 static struct md_sysfs_entry md_suspend_hi =
3440 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3443 reshape_position_show(mddev_t *mddev, char *page)
3445 if (mddev->reshape_position != MaxSector)
3446 return sprintf(page, "%llu\n",
3447 (unsigned long long)mddev->reshape_position);
3448 strcpy(page, "none\n");
3453 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3456 unsigned long long new = simple_strtoull(buf, &e, 10);
3459 if (buf == e || (*e && *e != '\n'))
3461 mddev->reshape_position = new;
3462 mddev->delta_disks = 0;
3463 mddev->new_level = mddev->level;
3464 mddev->new_layout = mddev->layout;
3465 mddev->new_chunk = mddev->chunk_size;
3469 static struct md_sysfs_entry md_reshape_position =
3470 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3471 reshape_position_store);
3474 static struct attribute *md_default_attrs[] = {
3477 &md_raid_disks.attr,
3478 &md_chunk_size.attr,
3480 &md_resync_start.attr,
3482 &md_new_device.attr,
3483 &md_safe_delay.attr,
3484 &md_array_state.attr,
3485 &md_reshape_position.attr,
3489 static struct attribute *md_redundancy_attrs[] = {
3491 &md_mismatches.attr,
3494 &md_sync_speed.attr,
3495 &md_sync_force_parallel.attr,
3496 &md_sync_completed.attr,
3499 &md_suspend_lo.attr,
3500 &md_suspend_hi.attr,
3505 static struct attribute_group md_redundancy_group = {
3507 .attrs = md_redundancy_attrs,
3512 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3514 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3515 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3520 rv = mddev_lock(mddev);
3522 rv = entry->show(mddev, page);
3523 mddev_unlock(mddev);
3529 md_attr_store(struct kobject *kobj, struct attribute *attr,
3530 const char *page, size_t length)
3532 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3533 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3538 if (!capable(CAP_SYS_ADMIN))
3540 rv = mddev_lock(mddev);
3541 if (mddev->hold_active == UNTIL_IOCTL)
3542 mddev->hold_active = 0;
3544 rv = entry->store(mddev, page, length);
3545 mddev_unlock(mddev);
3550 static void md_free(struct kobject *ko)
3552 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3554 if (mddev->sysfs_state)
3555 sysfs_put(mddev->sysfs_state);
3557 if (mddev->gendisk) {
3558 del_gendisk(mddev->gendisk);
3559 put_disk(mddev->gendisk);
3562 blk_cleanup_queue(mddev->queue);
3567 static struct sysfs_ops md_sysfs_ops = {
3568 .show = md_attr_show,
3569 .store = md_attr_store,
3571 static struct kobj_type md_ktype = {
3573 .sysfs_ops = &md_sysfs_ops,
3574 .default_attrs = md_default_attrs,
3579 static int md_alloc(dev_t dev, char *name)
3581 static DEFINE_MUTEX(disks_mutex);
3582 mddev_t *mddev = mddev_find(dev);
3583 struct gendisk *disk;
3592 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3593 shift = partitioned ? MdpMinorShift : 0;
3594 unit = MINOR(mddev->unit) >> shift;
3596 /* wait for any previous instance if this device
3597 * to be completed removed (mddev_delayed_delete).
3599 flush_scheduled_work();
3601 mutex_lock(&disks_mutex);
3602 if (mddev->gendisk) {
3603 mutex_unlock(&disks_mutex);
3609 /* Need to ensure that 'name' is not a duplicate.
3612 spin_lock(&all_mddevs_lock);
3614 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3615 if (mddev2->gendisk &&
3616 strcmp(mddev2->gendisk->disk_name, name) == 0) {
3617 spin_unlock(&all_mddevs_lock);
3620 spin_unlock(&all_mddevs_lock);
3623 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3624 if (!mddev->queue) {
3625 mutex_unlock(&disks_mutex);
3629 /* Can be unlocked because the queue is new: no concurrency */
3630 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3632 blk_queue_make_request(mddev->queue, md_fail_request);
3634 disk = alloc_disk(1 << shift);
3636 mutex_unlock(&disks_mutex);
3637 blk_cleanup_queue(mddev->queue);
3638 mddev->queue = NULL;
3642 disk->major = MAJOR(mddev->unit);
3643 disk->first_minor = unit << shift;
3645 strcpy(disk->disk_name, name);
3646 else if (partitioned)
3647 sprintf(disk->disk_name, "md_d%d", unit);
3649 sprintf(disk->disk_name, "md%d", unit);
3650 disk->fops = &md_fops;
3651 disk->private_data = mddev;
3652 disk->queue = mddev->queue;
3653 /* Allow extended partitions. This makes the
3654 * 'mdp' device redundant, but we can't really
3657 disk->flags |= GENHD_FL_EXT_DEVT;
3659 mddev->gendisk = disk;
3660 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3661 &disk_to_dev(disk)->kobj, "%s", "md");
3662 mutex_unlock(&disks_mutex);
3664 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3667 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3668 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3674 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3676 md_alloc(dev, NULL);
3680 static int add_named_array(const char *val, struct kernel_param *kp)
3682 /* val must be "md_*" where * is not all digits.
3683 * We allocate an array with a large free minor number, and
3684 * set the name to val. val must not already be an active name.
3686 int len = strlen(val);
3687 char buf[DISK_NAME_LEN];
3689 while (len && val[len-1] == '\n')
3691 if (len >= DISK_NAME_LEN)
3693 strlcpy(buf, val, len+1);
3694 if (strncmp(buf, "md_", 3) != 0)
3696 return md_alloc(0, buf);
3699 static void md_safemode_timeout(unsigned long data)
3701 mddev_t *mddev = (mddev_t *) data;
3703 if (!atomic_read(&mddev->writes_pending)) {
3704 mddev->safemode = 1;
3705 if (mddev->external)
3706 sysfs_notify_dirent(mddev->sysfs_state);
3708 md_wakeup_thread(mddev->thread);
3711 static int start_dirty_degraded;
3713 static int do_md_run(mddev_t * mddev)
3718 struct gendisk *disk;
3719 struct mdk_personality *pers;
3720 char b[BDEVNAME_SIZE];
3722 if (list_empty(&mddev->disks))
3723 /* cannot run an array with no devices.. */
3730 * Analyze all RAID superblock(s)
3732 if (!mddev->raid_disks) {
3733 if (!mddev->persistent)
3738 chunk_size = mddev->chunk_size;
3741 if (chunk_size > MAX_CHUNK_SIZE) {
3742 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3743 chunk_size, MAX_CHUNK_SIZE);
3747 * chunk-size has to be a power of 2
3749 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3750 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3754 /* devices must have minimum size of one chunk */
3755 list_for_each_entry(rdev, &mddev->disks, same_set) {
3756 if (test_bit(Faulty, &rdev->flags))
3758 if (rdev->size < chunk_size / 1024) {
3760 "md: Dev %s smaller than chunk_size:"
3762 bdevname(rdev->bdev,b),
3763 (unsigned long long)rdev->size,
3770 if (mddev->level != LEVEL_NONE)
3771 request_module("md-level-%d", mddev->level);
3772 else if (mddev->clevel[0])
3773 request_module("md-%s", mddev->clevel);
3776 * Drop all container device buffers, from now on
3777 * the only valid external interface is through the md
3780 list_for_each_entry(rdev, &mddev->disks, same_set) {
3781 if (test_bit(Faulty, &rdev->flags))
3783 sync_blockdev(rdev->bdev);
3784 invalidate_bdev(rdev->bdev);
3786 /* perform some consistency tests on the device.
3787 * We don't want the data to overlap the metadata,
3788 * Internal Bitmap issues has handled elsewhere.
3790 if (rdev->data_offset < rdev->sb_start) {
3792 rdev->data_offset + mddev->size*2
3794 printk("md: %s: data overlaps metadata\n",
3799 if (rdev->sb_start + rdev->sb_size/512
3800 > rdev->data_offset) {
3801 printk("md: %s: metadata overlaps data\n",
3806 sysfs_notify_dirent(rdev->sysfs_state);
3809 md_probe(mddev->unit, NULL, NULL);
3810 disk = mddev->gendisk;
3814 spin_lock(&pers_lock);
3815 pers = find_pers(mddev->level, mddev->clevel);
3816 if (!pers || !try_module_get(pers->owner)) {
3817 spin_unlock(&pers_lock);
3818 if (mddev->level != LEVEL_NONE)
3819 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3822 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3827 spin_unlock(&pers_lock);
3828 mddev->level = pers->level;
3829 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3831 if (pers->level >= 4 && pers->level <= 6)
3832 /* Cannot support integrity (yet) */
3833 blk_integrity_unregister(mddev->gendisk);
3835 if (mddev->reshape_position != MaxSector &&
3836 pers->start_reshape == NULL) {
3837 /* This personality cannot handle reshaping... */
3839 module_put(pers->owner);
3843 if (pers->sync_request) {
3844 /* Warn if this is a potentially silly
3847 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3851 list_for_each_entry(rdev, &mddev->disks, same_set)
3852 list_for_each_entry(rdev2, &mddev->disks, same_set) {
3854 rdev->bdev->bd_contains ==
3855 rdev2->bdev->bd_contains) {
3857 "%s: WARNING: %s appears to be"
3858 " on the same physical disk as"
3861 bdevname(rdev->bdev,b),
3862 bdevname(rdev2->bdev,b2));
3869 "True protection against single-disk"
3870 " failure might be compromised.\n");
3873 mddev->recovery = 0;
3874 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3875 mddev->barriers_work = 1;
3876 mddev->ok_start_degraded = start_dirty_degraded;
3879 mddev->ro = 2; /* read-only, but switch on first write */
3881 err = mddev->pers->run(mddev);
3883 printk(KERN_ERR "md: pers->run() failed ...\n");
3884 else if (mddev->pers->sync_request) {
3885 err = bitmap_create(mddev);
3887 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3888 mdname(mddev), err);
3889 mddev->pers->stop(mddev);
3893 module_put(mddev->pers->owner);
3895 bitmap_destroy(mddev);
3898 if (mddev->pers->sync_request) {
3899 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3901 "md: cannot register extra attributes for %s\n",
3903 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3904 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3907 atomic_set(&mddev->writes_pending,0);
3908 mddev->safemode = 0;
3909 mddev->safemode_timer.function = md_safemode_timeout;
3910 mddev->safemode_timer.data = (unsigned long) mddev;
3911 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3914 list_for_each_entry(rdev, &mddev->disks, same_set)
3915 if (rdev->raid_disk >= 0) {
3917 sprintf(nm, "rd%d", rdev->raid_disk);
3918 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3919 printk("md: cannot register %s for %s\n",
3923 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3926 md_update_sb(mddev, 0);
3928 set_capacity(disk, mddev->array_sectors);
3930 /* If we call blk_queue_make_request here, it will
3931 * re-initialise max_sectors etc which may have been
3932 * refined inside -> run. So just set the bits we need to set.
3933 * Most initialisation happended when we called
3934 * blk_queue_make_request(..., md_fail_request)
3937 mddev->queue->queuedata = mddev;
3938 mddev->queue->make_request_fn = mddev->pers->make_request;
3940 /* If there is a partially-recovered drive we need to
3941 * start recovery here. If we leave it to md_check_recovery,
3942 * it will remove the drives and not do the right thing
3944 if (mddev->degraded && !mddev->sync_thread) {
3946 list_for_each_entry(rdev, &mddev->disks, same_set)
3947 if (rdev->raid_disk >= 0 &&
3948 !test_bit(In_sync, &rdev->flags) &&
3949 !test_bit(Faulty, &rdev->flags))
3950 /* complete an interrupted recovery */
3952 if (spares && mddev->pers->sync_request) {
3953 mddev->recovery = 0;
3954 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3955 mddev->sync_thread = md_register_thread(md_do_sync,
3958 if (!mddev->sync_thread) {
3959 printk(KERN_ERR "%s: could not start resync"
3962 /* leave the spares where they are, it shouldn't hurt */
3963 mddev->recovery = 0;
3967 md_wakeup_thread(mddev->thread);
3968 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3971 md_new_event(mddev);
3972 sysfs_notify_dirent(mddev->sysfs_state);
3973 if (mddev->sysfs_action)
3974 sysfs_notify_dirent(mddev->sysfs_action);
3975 sysfs_notify(&mddev->kobj, NULL, "degraded");
3976 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3980 static int restart_array(mddev_t *mddev)
3982 struct gendisk *disk = mddev->gendisk;
3984 /* Complain if it has no devices */
3985 if (list_empty(&mddev->disks))
3991 mddev->safemode = 0;
3993 set_disk_ro(disk, 0);
3994 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3996 /* Kick recovery or resync if necessary */
3997 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3998 md_wakeup_thread(mddev->thread);
3999 md_wakeup_thread(mddev->sync_thread);
4000 sysfs_notify_dirent(mddev->sysfs_state);
4004 /* similar to deny_write_access, but accounts for our holding a reference
4005 * to the file ourselves */
4006 static int deny_bitmap_write_access(struct file * file)
4008 struct inode *inode = file->f_mapping->host;
4010 spin_lock(&inode->i_lock);
4011 if (atomic_read(&inode->i_writecount) > 1) {
4012 spin_unlock(&inode->i_lock);
4015 atomic_set(&inode->i_writecount, -1);
4016 spin_unlock(&inode->i_lock);
4021 static void restore_bitmap_write_access(struct file *file)
4023 struct inode *inode = file->f_mapping->host;
4025 spin_lock(&inode->i_lock);
4026 atomic_set(&inode->i_writecount, 1);
4027 spin_unlock(&inode->i_lock);
4031 * 0 - completely stop and dis-assemble array
4032 * 1 - switch to readonly
4033 * 2 - stop but do not disassemble array
4035 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4038 struct gendisk *disk = mddev->gendisk;
4040 if (atomic_read(&mddev->openers) > is_open) {
4041 printk("md: %s still in use.\n",mdname(mddev));
4047 if (mddev->sync_thread) {
4048 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4049 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4050 md_unregister_thread(mddev->sync_thread);
4051 mddev->sync_thread = NULL;
4054 del_timer_sync(&mddev->safemode_timer);
4057 case 1: /* readonly */
4063 case 0: /* disassemble */
4065 bitmap_flush(mddev);
4066 md_super_wait(mddev);
4068 set_disk_ro(disk, 0);
4069 blk_queue_make_request(mddev->queue, md_fail_request);
4070 mddev->pers->stop(mddev);
4071 mddev->queue->merge_bvec_fn = NULL;
4072 mddev->queue->unplug_fn = NULL;
4073 mddev->queue->backing_dev_info.congested_fn = NULL;
4074 if (mddev->pers->sync_request) {
4075 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
4076 if (mddev->sysfs_action)
4077 sysfs_put(mddev->sysfs_action);
4078 mddev->sysfs_action = NULL;
4080 module_put(mddev->pers->owner);
4082 /* tell userspace to handle 'inactive' */
4083 sysfs_notify_dirent(mddev->sysfs_state);
4085 set_capacity(disk, 0);
4091 if (!mddev->in_sync || mddev->flags) {
4092 /* mark array as shutdown cleanly */
4094 md_update_sb(mddev, 1);
4097 set_disk_ro(disk, 1);
4098 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4102 * Free resources if final stop
4107 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4109 bitmap_destroy(mddev);
4110 if (mddev->bitmap_file) {
4111 restore_bitmap_write_access(mddev->bitmap_file);
4112 fput(mddev->bitmap_file);
4113 mddev->bitmap_file = NULL;
4115 mddev->bitmap_offset = 0;
4117 list_for_each_entry(rdev, &mddev->disks, same_set)
4118 if (rdev->raid_disk >= 0) {
4120 sprintf(nm, "rd%d", rdev->raid_disk);
4121 sysfs_remove_link(&mddev->kobj, nm);
4124 /* make sure all md_delayed_delete calls have finished */
4125 flush_scheduled_work();
4127 export_array(mddev);
4129 mddev->array_sectors = 0;
4131 mddev->raid_disks = 0;
4132 mddev->recovery_cp = 0;
4133 mddev->resync_min = 0;
4134 mddev->resync_max = MaxSector;
4135 mddev->reshape_position = MaxSector;
4136 mddev->external = 0;
4137 mddev->persistent = 0;
4138 mddev->level = LEVEL_NONE;
4139 mddev->clevel[0] = 0;
4142 mddev->metadata_type[0] = 0;
4143 mddev->chunk_size = 0;
4144 mddev->ctime = mddev->utime = 0;
4146 mddev->max_disks = 0;
4148 mddev->delta_disks = 0;
4149 mddev->new_level = LEVEL_NONE;
4150 mddev->new_layout = 0;
4151 mddev->new_chunk = 0;
4152 mddev->curr_resync = 0;
4153 mddev->resync_mismatches = 0;
4154 mddev->suspend_lo = mddev->suspend_hi = 0;
4155 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4156 mddev->recovery = 0;
4159 mddev->degraded = 0;
4160 mddev->barriers_work = 0;
4161 mddev->safemode = 0;
4162 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4163 if (mddev->hold_active == UNTIL_STOP)
4164 mddev->hold_active = 0;
4166 } else if (mddev->pers)
4167 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4170 blk_integrity_unregister(disk);
4171 md_new_event(mddev);
4172 sysfs_notify_dirent(mddev->sysfs_state);
4178 static void autorun_array(mddev_t *mddev)
4183 if (list_empty(&mddev->disks))
4186 printk(KERN_INFO "md: running: ");
4188 list_for_each_entry(rdev, &mddev->disks, same_set) {
4189 char b[BDEVNAME_SIZE];
4190 printk("<%s>", bdevname(rdev->bdev,b));
4194 err = do_md_run(mddev);
4196 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4197 do_md_stop(mddev, 0, 0);
4202 * lets try to run arrays based on all disks that have arrived
4203 * until now. (those are in pending_raid_disks)
4205 * the method: pick the first pending disk, collect all disks with
4206 * the same UUID, remove all from the pending list and put them into
4207 * the 'same_array' list. Then order this list based on superblock
4208 * update time (freshest comes first), kick out 'old' disks and
4209 * compare superblocks. If everything's fine then run it.
4211 * If "unit" is allocated, then bump its reference count
4213 static void autorun_devices(int part)
4215 mdk_rdev_t *rdev0, *rdev, *tmp;
4217 char b[BDEVNAME_SIZE];
4219 printk(KERN_INFO "md: autorun ...\n");
4220 while (!list_empty(&pending_raid_disks)) {
4223 LIST_HEAD(candidates);
4224 rdev0 = list_entry(pending_raid_disks.next,
4225 mdk_rdev_t, same_set);
4227 printk(KERN_INFO "md: considering %s ...\n",
4228 bdevname(rdev0->bdev,b));
4229 INIT_LIST_HEAD(&candidates);
4230 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4231 if (super_90_load(rdev, rdev0, 0) >= 0) {
4232 printk(KERN_INFO "md: adding %s ...\n",
4233 bdevname(rdev->bdev,b));
4234 list_move(&rdev->same_set, &candidates);
4237 * now we have a set of devices, with all of them having
4238 * mostly sane superblocks. It's time to allocate the
4242 dev = MKDEV(mdp_major,
4243 rdev0->preferred_minor << MdpMinorShift);
4244 unit = MINOR(dev) >> MdpMinorShift;
4246 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4249 if (rdev0->preferred_minor != unit) {
4250 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4251 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4255 md_probe(dev, NULL, NULL);
4256 mddev = mddev_find(dev);
4257 if (!mddev || !mddev->gendisk) {
4261 "md: cannot allocate memory for md drive.\n");
4264 if (mddev_lock(mddev))
4265 printk(KERN_WARNING "md: %s locked, cannot run\n",
4267 else if (mddev->raid_disks || mddev->major_version
4268 || !list_empty(&mddev->disks)) {
4270 "md: %s already running, cannot run %s\n",
4271 mdname(mddev), bdevname(rdev0->bdev,b));
4272 mddev_unlock(mddev);
4274 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4275 mddev->persistent = 1;
4276 rdev_for_each_list(rdev, tmp, &candidates) {
4277 list_del_init(&rdev->same_set);
4278 if (bind_rdev_to_array(rdev, mddev))
4281 autorun_array(mddev);
4282 mddev_unlock(mddev);
4284 /* on success, candidates will be empty, on error
4287 rdev_for_each_list(rdev, tmp, &candidates) {
4288 list_del_init(&rdev->same_set);
4293 printk(KERN_INFO "md: ... autorun DONE.\n");
4295 #endif /* !MODULE */
4297 static int get_version(void __user * arg)
4301 ver.major = MD_MAJOR_VERSION;
4302 ver.minor = MD_MINOR_VERSION;
4303 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4305 if (copy_to_user(arg, &ver, sizeof(ver)))
4311 static int get_array_info(mddev_t * mddev, void __user * arg)
4313 mdu_array_info_t info;
4314 int nr,working,active,failed,spare;
4317 nr=working=active=failed=spare=0;
4318 list_for_each_entry(rdev, &mddev->disks, same_set) {
4320 if (test_bit(Faulty, &rdev->flags))
4324 if (test_bit(In_sync, &rdev->flags))
4331 info.major_version = mddev->major_version;
4332 info.minor_version = mddev->minor_version;
4333 info.patch_version = MD_PATCHLEVEL_VERSION;
4334 info.ctime = mddev->ctime;
4335 info.level = mddev->level;
4336 info.size = mddev->size;
4337 if (info.size != mddev->size) /* overflow */
4340 info.raid_disks = mddev->raid_disks;
4341 info.md_minor = mddev->md_minor;
4342 info.not_persistent= !mddev->persistent;
4344 info.utime = mddev->utime;
4347 info.state = (1<<MD_SB_CLEAN);
4348 if (mddev->bitmap && mddev->bitmap_offset)
4349 info.state = (1<<MD_SB_BITMAP_PRESENT);
4350 info.active_disks = active;
4351 info.working_disks = working;
4352 info.failed_disks = failed;
4353 info.spare_disks = spare;
4355 info.layout = mddev->layout;
4356 info.chunk_size = mddev->chunk_size;
4358 if (copy_to_user(arg, &info, sizeof(info)))
4364 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4366 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4367 char *ptr, *buf = NULL;
4370 if (md_allow_write(mddev))
4371 file = kmalloc(sizeof(*file), GFP_NOIO);
4373 file = kmalloc(sizeof(*file), GFP_KERNEL);
4378 /* bitmap disabled, zero the first byte and copy out */
4379 if (!mddev->bitmap || !mddev->bitmap->file) {
4380 file->pathname[0] = '\0';
4384 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4388 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4392 strcpy(file->pathname, ptr);
4396 if (copy_to_user(arg, file, sizeof(*file)))
4404 static int get_disk_info(mddev_t * mddev, void __user * arg)
4406 mdu_disk_info_t info;
4409 if (copy_from_user(&info, arg, sizeof(info)))
4412 rdev = find_rdev_nr(mddev, info.number);
4414 info.major = MAJOR(rdev->bdev->bd_dev);
4415 info.minor = MINOR(rdev->bdev->bd_dev);
4416 info.raid_disk = rdev->raid_disk;
4418 if (test_bit(Faulty, &rdev->flags))
4419 info.state |= (1<<MD_DISK_FAULTY);
4420 else if (test_bit(In_sync, &rdev->flags)) {
4421 info.state |= (1<<MD_DISK_ACTIVE);
4422 info.state |= (1<<MD_DISK_SYNC);
4424 if (test_bit(WriteMostly, &rdev->flags))
4425 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4427 info.major = info.minor = 0;
4428 info.raid_disk = -1;
4429 info.state = (1<<MD_DISK_REMOVED);
4432 if (copy_to_user(arg, &info, sizeof(info)))
4438 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4440 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4442 dev_t dev = MKDEV(info->major,info->minor);
4444 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4447 if (!mddev->raid_disks) {
4449 /* expecting a device which has a superblock */
4450 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4453 "md: md_import_device returned %ld\n",
4455 return PTR_ERR(rdev);
4457 if (!list_empty(&mddev->disks)) {
4458 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4459 mdk_rdev_t, same_set);
4460 int err = super_types[mddev->major_version]
4461 .load_super(rdev, rdev0, mddev->minor_version);
4464 "md: %s has different UUID to %s\n",
4465 bdevname(rdev->bdev,b),
4466 bdevname(rdev0->bdev,b2));
4471 err = bind_rdev_to_array(rdev, mddev);
4478 * add_new_disk can be used once the array is assembled
4479 * to add "hot spares". They must already have a superblock
4484 if (!mddev->pers->hot_add_disk) {
4486 "%s: personality does not support diskops!\n",
4490 if (mddev->persistent)
4491 rdev = md_import_device(dev, mddev->major_version,
4492 mddev->minor_version);
4494 rdev = md_import_device(dev, -1, -1);
4497 "md: md_import_device returned %ld\n",
4499 return PTR_ERR(rdev);
4501 /* set save_raid_disk if appropriate */
4502 if (!mddev->persistent) {
4503 if (info->state & (1<<MD_DISK_SYNC) &&
4504 info->raid_disk < mddev->raid_disks)
4505 rdev->raid_disk = info->raid_disk;
4507 rdev->raid_disk = -1;
4509 super_types[mddev->major_version].
4510 validate_super(mddev, rdev);
4511 rdev->saved_raid_disk = rdev->raid_disk;
4513 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4514 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4515 set_bit(WriteMostly, &rdev->flags);
4517 rdev->raid_disk = -1;
4518 err = bind_rdev_to_array(rdev, mddev);
4519 if (!err && !mddev->pers->hot_remove_disk) {
4520 /* If there is hot_add_disk but no hot_remove_disk
4521 * then added disks for geometry changes,
4522 * and should be added immediately.
4524 super_types[mddev->major_version].
4525 validate_super(mddev, rdev);
4526 err = mddev->pers->hot_add_disk(mddev, rdev);
4528 unbind_rdev_from_array(rdev);
4533 sysfs_notify_dirent(rdev->sysfs_state);
4535 md_update_sb(mddev, 1);
4536 if (mddev->degraded)
4537 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4538 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4539 md_wakeup_thread(mddev->thread);
4543 /* otherwise, add_new_disk is only allowed
4544 * for major_version==0 superblocks
4546 if (mddev->major_version != 0) {
4547 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4552 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4554 rdev = md_import_device(dev, -1, 0);
4557 "md: error, md_import_device() returned %ld\n",
4559 return PTR_ERR(rdev);
4561 rdev->desc_nr = info->number;
4562 if (info->raid_disk < mddev->raid_disks)
4563 rdev->raid_disk = info->raid_disk;
4565 rdev->raid_disk = -1;
4567 if (rdev->raid_disk < mddev->raid_disks)
4568 if (info->state & (1<<MD_DISK_SYNC))
4569 set_bit(In_sync, &rdev->flags);
4571 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4572 set_bit(WriteMostly, &rdev->flags);
4574 if (!mddev->persistent) {
4575 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4576 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4578 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4579 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4581 err = bind_rdev_to_array(rdev, mddev);
4591 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4593 char b[BDEVNAME_SIZE];
4596 rdev = find_rdev(mddev, dev);
4600 if (rdev->raid_disk >= 0)
4603 kick_rdev_from_array(rdev);
4604 md_update_sb(mddev, 1);
4605 md_new_event(mddev);
4609 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4610 bdevname(rdev->bdev,b), mdname(mddev));
4614 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4616 char b[BDEVNAME_SIZE];
4623 if (mddev->major_version != 0) {
4624 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4625 " version-0 superblocks.\n",
4629 if (!mddev->pers->hot_add_disk) {
4631 "%s: personality does not support diskops!\n",
4636 rdev = md_import_device(dev, -1, 0);
4639 "md: error, md_import_device() returned %ld\n",
4644 if (mddev->persistent)
4645 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4647 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4649 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4651 if (test_bit(Faulty, &rdev->flags)) {
4653 "md: can not hot-add faulty %s disk to %s!\n",
4654 bdevname(rdev->bdev,b), mdname(mddev));
4658 clear_bit(In_sync, &rdev->flags);
4660 rdev->saved_raid_disk = -1;
4661 err = bind_rdev_to_array(rdev, mddev);
4666 * The rest should better be atomic, we can have disk failures
4667 * noticed in interrupt contexts ...
4670 rdev->raid_disk = -1;
4672 md_update_sb(mddev, 1);
4675 * Kick recovery, maybe this spare has to be added to the
4676 * array immediately.
4678 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4679 md_wakeup_thread(mddev->thread);
4680 md_new_event(mddev);
4688 static int set_bitmap_file(mddev_t *mddev, int fd)
4693 if (!mddev->pers->quiesce)
4695 if (mddev->recovery || mddev->sync_thread)
4697 /* we should be able to change the bitmap.. */
4703 return -EEXIST; /* cannot add when bitmap is present */
4704 mddev->bitmap_file = fget(fd);
4706 if (mddev->bitmap_file == NULL) {
4707 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4712 err = deny_bitmap_write_access(mddev->bitmap_file);
4714 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4716 fput(mddev->bitmap_file);
4717 mddev->bitmap_file = NULL;
4720 mddev->bitmap_offset = 0; /* file overrides offset */
4721 } else if (mddev->bitmap == NULL)
4722 return -ENOENT; /* cannot remove what isn't there */
4725 mddev->pers->quiesce(mddev, 1);
4727 err = bitmap_create(mddev);
4728 if (fd < 0 || err) {
4729 bitmap_destroy(mddev);
4730 fd = -1; /* make sure to put the file */
4732 mddev->pers->quiesce(mddev, 0);
4735 if (mddev->bitmap_file) {
4736 restore_bitmap_write_access(mddev->bitmap_file);
4737 fput(mddev->bitmap_file);
4739 mddev->bitmap_file = NULL;
4746 * set_array_info is used two different ways
4747 * The original usage is when creating a new array.
4748 * In this usage, raid_disks is > 0 and it together with
4749 * level, size, not_persistent,layout,chunksize determine the
4750 * shape of the array.
4751 * This will always create an array with a type-0.90.0 superblock.
4752 * The newer usage is when assembling an array.
4753 * In this case raid_disks will be 0, and the major_version field is
4754 * use to determine which style super-blocks are to be found on the devices.
4755 * The minor and patch _version numbers are also kept incase the
4756 * super_block handler wishes to interpret them.
4758 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4761 if (info->raid_disks == 0) {
4762 /* just setting version number for superblock loading */
4763 if (info->major_version < 0 ||
4764 info->major_version >= ARRAY_SIZE(super_types) ||
4765 super_types[info->major_version].name == NULL) {
4766 /* maybe try to auto-load a module? */
4768 "md: superblock version %d not known\n",
4769 info->major_version);
4772 mddev->major_version = info->major_version;
4773 mddev->minor_version = info->minor_version;
4774 mddev->patch_version = info->patch_version;
4775 mddev->persistent = !info->not_persistent;
4778 mddev->major_version = MD_MAJOR_VERSION;
4779 mddev->minor_version = MD_MINOR_VERSION;
4780 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4781 mddev->ctime = get_seconds();
4783 mddev->level = info->level;
4784 mddev->clevel[0] = 0;
4785 mddev->size = info->size;
4786 mddev->raid_disks = info->raid_disks;
4787 /* don't set md_minor, it is determined by which /dev/md* was
4790 if (info->state & (1<<MD_SB_CLEAN))
4791 mddev->recovery_cp = MaxSector;
4793 mddev->recovery_cp = 0;
4794 mddev->persistent = ! info->not_persistent;
4795 mddev->external = 0;
4797 mddev->layout = info->layout;
4798 mddev->chunk_size = info->chunk_size;
4800 mddev->max_disks = MD_SB_DISKS;
4802 if (mddev->persistent)
4804 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4806 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4807 mddev->bitmap_offset = 0;
4809 mddev->reshape_position = MaxSector;
4812 * Generate a 128 bit UUID
4814 get_random_bytes(mddev->uuid, 16);
4816 mddev->new_level = mddev->level;
4817 mddev->new_chunk = mddev->chunk_size;
4818 mddev->new_layout = mddev->layout;
4819 mddev->delta_disks = 0;
4824 static int update_size(mddev_t *mddev, sector_t num_sectors)
4828 int fit = (num_sectors == 0);
4830 if (mddev->pers->resize == NULL)
4832 /* The "num_sectors" is the number of sectors of each device that
4833 * is used. This can only make sense for arrays with redundancy.
4834 * linear and raid0 always use whatever space is available. We can only
4835 * consider changing this number if no resync or reconstruction is
4836 * happening, and if the new size is acceptable. It must fit before the
4837 * sb_start or, if that is <data_offset, it must fit before the size
4838 * of each device. If num_sectors is zero, we find the largest size
4842 if (mddev->sync_thread)
4845 /* Sorry, cannot grow a bitmap yet, just remove it,
4849 list_for_each_entry(rdev, &mddev->disks, same_set) {
4851 avail = rdev->size * 2;
4853 if (fit && (num_sectors == 0 || num_sectors > avail))
4854 num_sectors = avail;
4855 if (avail < num_sectors)
4858 rv = mddev->pers->resize(mddev, num_sectors);
4860 struct block_device *bdev;
4862 bdev = bdget_disk(mddev->gendisk, 0);
4864 mutex_lock(&bdev->bd_inode->i_mutex);
4865 i_size_write(bdev->bd_inode,
4866 (loff_t)mddev->array_sectors << 9);
4867 mutex_unlock(&bdev->bd_inode->i_mutex);
4874 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4877 /* change the number of raid disks */
4878 if (mddev->pers->check_reshape == NULL)
4880 if (raid_disks <= 0 ||
4881 raid_disks >= mddev->max_disks)
4883 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4885 mddev->delta_disks = raid_disks - mddev->raid_disks;
4887 rv = mddev->pers->check_reshape(mddev);
4893 * update_array_info is used to change the configuration of an
4895 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4896 * fields in the info are checked against the array.
4897 * Any differences that cannot be handled will cause an error.
4898 * Normally, only one change can be managed at a time.
4900 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4906 /* calculate expected state,ignoring low bits */
4907 if (mddev->bitmap && mddev->bitmap_offset)
4908 state |= (1 << MD_SB_BITMAP_PRESENT);
4910 if (mddev->major_version != info->major_version ||
4911 mddev->minor_version != info->minor_version ||
4912 /* mddev->patch_version != info->patch_version || */
4913 mddev->ctime != info->ctime ||
4914 mddev->level != info->level ||
4915 /* mddev->layout != info->layout || */
4916 !mddev->persistent != info->not_persistent||
4917 mddev->chunk_size != info->chunk_size ||
4918 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4919 ((state^info->state) & 0xfffffe00)
4922 /* Check there is only one change */
4923 if (info->size >= 0 && mddev->size != info->size) cnt++;
4924 if (mddev->raid_disks != info->raid_disks) cnt++;
4925 if (mddev->layout != info->layout) cnt++;
4926 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4927 if (cnt == 0) return 0;
4928 if (cnt > 1) return -EINVAL;
4930 if (mddev->layout != info->layout) {
4932 * we don't need to do anything at the md level, the
4933 * personality will take care of it all.
4935 if (mddev->pers->reconfig == NULL)
4938 return mddev->pers->reconfig(mddev, info->layout, -1);
4940 if (info->size >= 0 && mddev->size != info->size)
4941 rv = update_size(mddev, (sector_t)info->size * 2);
4943 if (mddev->raid_disks != info->raid_disks)
4944 rv = update_raid_disks(mddev, info->raid_disks);
4946 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4947 if (mddev->pers->quiesce == NULL)
4949 if (mddev->recovery || mddev->sync_thread)
4951 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4952 /* add the bitmap */
4955 if (mddev->default_bitmap_offset == 0)
4957 mddev->bitmap_offset = mddev->default_bitmap_offset;
4958 mddev->pers->quiesce(mddev, 1);
4959 rv = bitmap_create(mddev);
4961 bitmap_destroy(mddev);
4962 mddev->pers->quiesce(mddev, 0);
4964 /* remove the bitmap */
4967 if (mddev->bitmap->file)
4969 mddev->pers->quiesce(mddev, 1);
4970 bitmap_destroy(mddev);
4971 mddev->pers->quiesce(mddev, 0);
4972 mddev->bitmap_offset = 0;
4975 md_update_sb(mddev, 1);
4979 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4983 if (mddev->pers == NULL)
4986 rdev = find_rdev(mddev, dev);
4990 md_error(mddev, rdev);
4995 * We have a problem here : there is no easy way to give a CHS
4996 * virtual geometry. We currently pretend that we have a 2 heads
4997 * 4 sectors (with a BIG number of cylinders...). This drives
4998 * dosfs just mad... ;-)
5000 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5002 mddev_t *mddev = bdev->bd_disk->private_data;
5006 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5010 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5011 unsigned int cmd, unsigned long arg)
5014 void __user *argp = (void __user *)arg;
5015 mddev_t *mddev = NULL;
5017 if (!capable(CAP_SYS_ADMIN))
5021 * Commands dealing with the RAID driver but not any
5027 err = get_version(argp);
5030 case PRINT_RAID_DEBUG:
5038 autostart_arrays(arg);
5045 * Commands creating/starting a new array:
5048 mddev = bdev->bd_disk->private_data;
5055 err = mddev_lock(mddev);
5058 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5065 case SET_ARRAY_INFO:
5067 mdu_array_info_t info;
5069 memset(&info, 0, sizeof(info));
5070 else if (copy_from_user(&info, argp, sizeof(info))) {
5075 err = update_array_info(mddev, &info);
5077 printk(KERN_WARNING "md: couldn't update"
5078 " array info. %d\n", err);
5083 if (!list_empty(&mddev->disks)) {
5085 "md: array %s already has disks!\n",
5090 if (mddev->raid_disks) {
5092 "md: array %s already initialised!\n",
5097 err = set_array_info(mddev, &info);
5099 printk(KERN_WARNING "md: couldn't set"
5100 " array info. %d\n", err);
5110 * Commands querying/configuring an existing array:
5112 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5113 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5114 if ((!mddev->raid_disks && !mddev->external)
5115 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5116 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5117 && cmd != GET_BITMAP_FILE) {
5123 * Commands even a read-only array can execute:
5127 case GET_ARRAY_INFO:
5128 err = get_array_info(mddev, argp);
5131 case GET_BITMAP_FILE:
5132 err = get_bitmap_file(mddev, argp);
5136 err = get_disk_info(mddev, argp);
5139 case RESTART_ARRAY_RW:
5140 err = restart_array(mddev);
5144 err = do_md_stop(mddev, 0, 1);
5148 err = do_md_stop(mddev, 1, 1);
5154 * The remaining ioctls are changing the state of the
5155 * superblock, so we do not allow them on read-only arrays.
5156 * However non-MD ioctls (e.g. get-size) will still come through
5157 * here and hit the 'default' below, so only disallow
5158 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5160 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5161 if (mddev->ro == 2) {
5163 sysfs_notify_dirent(mddev->sysfs_state);
5164 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5165 md_wakeup_thread(mddev->thread);
5176 mdu_disk_info_t info;
5177 if (copy_from_user(&info, argp, sizeof(info)))
5180 err = add_new_disk(mddev, &info);
5184 case HOT_REMOVE_DISK:
5185 err = hot_remove_disk(mddev, new_decode_dev(arg));
5189 err = hot_add_disk(mddev, new_decode_dev(arg));
5192 case SET_DISK_FAULTY:
5193 err = set_disk_faulty(mddev, new_decode_dev(arg));
5197 err = do_md_run(mddev);
5200 case SET_BITMAP_FILE:
5201 err = set_bitmap_file(mddev, (int)arg);
5211 if (mddev->hold_active == UNTIL_IOCTL &&
5213 mddev->hold_active = 0;
5214 mddev_unlock(mddev);
5224 static int md_open(struct block_device *bdev, fmode_t mode)
5227 * Succeed if we can lock the mddev, which confirms that
5228 * it isn't being stopped right now.
5230 mddev_t *mddev = mddev_find(bdev->bd_dev);
5233 if (mddev->gendisk != bdev->bd_disk) {
5234 /* we are racing with mddev_put which is discarding this
5238 /* Wait until bdev->bd_disk is definitely gone */
5239 flush_scheduled_work();
5240 /* Then retry the open from the top */
5241 return -ERESTARTSYS;
5243 BUG_ON(mddev != bdev->bd_disk->private_data);
5245 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5249 atomic_inc(&mddev->openers);
5250 mddev_unlock(mddev);
5252 check_disk_change(bdev);
5257 static int md_release(struct gendisk *disk, fmode_t mode)
5259 mddev_t *mddev = disk->private_data;
5262 atomic_dec(&mddev->openers);
5268 static int md_media_changed(struct gendisk *disk)
5270 mddev_t *mddev = disk->private_data;
5272 return mddev->changed;
5275 static int md_revalidate(struct gendisk *disk)
5277 mddev_t *mddev = disk->private_data;
5282 static struct block_device_operations md_fops =
5284 .owner = THIS_MODULE,
5286 .release = md_release,
5287 .locked_ioctl = md_ioctl,
5288 .getgeo = md_getgeo,
5289 .media_changed = md_media_changed,
5290 .revalidate_disk= md_revalidate,
5293 static int md_thread(void * arg)
5295 mdk_thread_t *thread = arg;
5298 * md_thread is a 'system-thread', it's priority should be very
5299 * high. We avoid resource deadlocks individually in each
5300 * raid personality. (RAID5 does preallocation) We also use RR and
5301 * the very same RT priority as kswapd, thus we will never get
5302 * into a priority inversion deadlock.
5304 * we definitely have to have equal or higher priority than
5305 * bdflush, otherwise bdflush will deadlock if there are too
5306 * many dirty RAID5 blocks.
5309 allow_signal(SIGKILL);
5310 while (!kthread_should_stop()) {
5312 /* We need to wait INTERRUPTIBLE so that
5313 * we don't add to the load-average.
5314 * That means we need to be sure no signals are
5317 if (signal_pending(current))
5318 flush_signals(current);
5320 wait_event_interruptible_timeout
5322 test_bit(THREAD_WAKEUP, &thread->flags)
5323 || kthread_should_stop(),
5326 clear_bit(THREAD_WAKEUP, &thread->flags);
5328 thread->run(thread->mddev);
5334 void md_wakeup_thread(mdk_thread_t *thread)
5337 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5338 set_bit(THREAD_WAKEUP, &thread->flags);
5339 wake_up(&thread->wqueue);
5343 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5346 mdk_thread_t *thread;
5348 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5352 init_waitqueue_head(&thread->wqueue);
5355 thread->mddev = mddev;
5356 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5357 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5358 if (IS_ERR(thread->tsk)) {
5365 void md_unregister_thread(mdk_thread_t *thread)
5367 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5369 kthread_stop(thread->tsk);
5373 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5380 if (!rdev || test_bit(Faulty, &rdev->flags))
5383 if (mddev->external)
5384 set_bit(Blocked, &rdev->flags);
5386 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5388 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5389 __builtin_return_address(0),__builtin_return_address(1),
5390 __builtin_return_address(2),__builtin_return_address(3));
5394 if (!mddev->pers->error_handler)
5396 mddev->pers->error_handler(mddev,rdev);
5397 if (mddev->degraded)
5398 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5399 set_bit(StateChanged, &rdev->flags);
5400 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5401 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5402 md_wakeup_thread(mddev->thread);
5403 md_new_event_inintr(mddev);
5406 /* seq_file implementation /proc/mdstat */
5408 static void status_unused(struct seq_file *seq)
5413 seq_printf(seq, "unused devices: ");
5415 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5416 char b[BDEVNAME_SIZE];
5418 seq_printf(seq, "%s ",
5419 bdevname(rdev->bdev,b));
5422 seq_printf(seq, "<none>");
5424 seq_printf(seq, "\n");
5428 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5430 sector_t max_blocks, resync, res;
5431 unsigned long dt, db, rt;
5433 unsigned int per_milli;
5435 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5437 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5438 max_blocks = mddev->resync_max_sectors >> 1;
5440 max_blocks = mddev->size;
5443 * Should not happen.
5449 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5450 * in a sector_t, and (max_blocks>>scale) will fit in a
5451 * u32, as those are the requirements for sector_div.
5452 * Thus 'scale' must be at least 10
5455 if (sizeof(sector_t) > sizeof(unsigned long)) {
5456 while ( max_blocks/2 > (1ULL<<(scale+32)))
5459 res = (resync>>scale)*1000;
5460 sector_div(res, (u32)((max_blocks>>scale)+1));
5464 int i, x = per_milli/50, y = 20-x;
5465 seq_printf(seq, "[");
5466 for (i = 0; i < x; i++)
5467 seq_printf(seq, "=");
5468 seq_printf(seq, ">");
5469 for (i = 0; i < y; i++)
5470 seq_printf(seq, ".");
5471 seq_printf(seq, "] ");
5473 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5474 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5476 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5478 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5479 "resync" : "recovery"))),
5480 per_milli/10, per_milli % 10,
5481 (unsigned long long) resync,
5482 (unsigned long long) max_blocks);
5485 * We do not want to overflow, so the order of operands and
5486 * the * 100 / 100 trick are important. We do a +1 to be
5487 * safe against division by zero. We only estimate anyway.
5489 * dt: time from mark until now
5490 * db: blocks written from mark until now
5491 * rt: remaining time
5493 dt = ((jiffies - mddev->resync_mark) / HZ);
5495 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5496 - mddev->resync_mark_cnt;
5497 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5499 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5501 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5504 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5506 struct list_head *tmp;
5516 spin_lock(&all_mddevs_lock);
5517 list_for_each(tmp,&all_mddevs)
5519 mddev = list_entry(tmp, mddev_t, all_mddevs);
5521 spin_unlock(&all_mddevs_lock);
5524 spin_unlock(&all_mddevs_lock);
5526 return (void*)2;/* tail */
5530 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5532 struct list_head *tmp;
5533 mddev_t *next_mddev, *mddev = v;
5539 spin_lock(&all_mddevs_lock);
5541 tmp = all_mddevs.next;
5543 tmp = mddev->all_mddevs.next;
5544 if (tmp != &all_mddevs)
5545 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5547 next_mddev = (void*)2;
5550 spin_unlock(&all_mddevs_lock);
5558 static void md_seq_stop(struct seq_file *seq, void *v)
5562 if (mddev && v != (void*)1 && v != (void*)2)
5566 struct mdstat_info {
5570 static int md_seq_show(struct seq_file *seq, void *v)
5575 struct mdstat_info *mi = seq->private;
5576 struct bitmap *bitmap;
5578 if (v == (void*)1) {
5579 struct mdk_personality *pers;
5580 seq_printf(seq, "Personalities : ");
5581 spin_lock(&pers_lock);
5582 list_for_each_entry(pers, &pers_list, list)
5583 seq_printf(seq, "[%s] ", pers->name);
5585 spin_unlock(&pers_lock);
5586 seq_printf(seq, "\n");
5587 mi->event = atomic_read(&md_event_count);
5590 if (v == (void*)2) {
5595 if (mddev_lock(mddev) < 0)
5598 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5599 seq_printf(seq, "%s : %sactive", mdname(mddev),
5600 mddev->pers ? "" : "in");
5603 seq_printf(seq, " (read-only)");
5605 seq_printf(seq, " (auto-read-only)");
5606 seq_printf(seq, " %s", mddev->pers->name);
5610 list_for_each_entry(rdev, &mddev->disks, same_set) {
5611 char b[BDEVNAME_SIZE];
5612 seq_printf(seq, " %s[%d]",
5613 bdevname(rdev->bdev,b), rdev->desc_nr);
5614 if (test_bit(WriteMostly, &rdev->flags))
5615 seq_printf(seq, "(W)");
5616 if (test_bit(Faulty, &rdev->flags)) {
5617 seq_printf(seq, "(F)");
5619 } else if (rdev->raid_disk < 0)
5620 seq_printf(seq, "(S)"); /* spare */
5624 if (!list_empty(&mddev->disks)) {
5626 seq_printf(seq, "\n %llu blocks",
5627 (unsigned long long)
5628 mddev->array_sectors / 2);
5630 seq_printf(seq, "\n %llu blocks",
5631 (unsigned long long)size);
5633 if (mddev->persistent) {
5634 if (mddev->major_version != 0 ||
5635 mddev->minor_version != 90) {
5636 seq_printf(seq," super %d.%d",
5637 mddev->major_version,
5638 mddev->minor_version);
5640 } else if (mddev->external)
5641 seq_printf(seq, " super external:%s",
5642 mddev->metadata_type);
5644 seq_printf(seq, " super non-persistent");
5647 mddev->pers->status(seq, mddev);
5648 seq_printf(seq, "\n ");
5649 if (mddev->pers->sync_request) {
5650 if (mddev->curr_resync > 2) {
5651 status_resync(seq, mddev);
5652 seq_printf(seq, "\n ");
5653 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5654 seq_printf(seq, "\tresync=DELAYED\n ");
5655 else if (mddev->recovery_cp < MaxSector)
5656 seq_printf(seq, "\tresync=PENDING\n ");
5659 seq_printf(seq, "\n ");
5661 if ((bitmap = mddev->bitmap)) {
5662 unsigned long chunk_kb;
5663 unsigned long flags;
5664 spin_lock_irqsave(&bitmap->lock, flags);
5665 chunk_kb = bitmap->chunksize >> 10;
5666 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5668 bitmap->pages - bitmap->missing_pages,
5670 (bitmap->pages - bitmap->missing_pages)
5671 << (PAGE_SHIFT - 10),
5672 chunk_kb ? chunk_kb : bitmap->chunksize,
5673 chunk_kb ? "KB" : "B");
5675 seq_printf(seq, ", file: ");
5676 seq_path(seq, &bitmap->file->f_path, " \t\n");
5679 seq_printf(seq, "\n");
5680 spin_unlock_irqrestore(&bitmap->lock, flags);
5683 seq_printf(seq, "\n");
5685 mddev_unlock(mddev);
5690 static struct seq_operations md_seq_ops = {
5691 .start = md_seq_start,
5692 .next = md_seq_next,
5693 .stop = md_seq_stop,
5694 .show = md_seq_show,
5697 static int md_seq_open(struct inode *inode, struct file *file)
5700 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5704 error = seq_open(file, &md_seq_ops);
5708 struct seq_file *p = file->private_data;
5710 mi->event = atomic_read(&md_event_count);
5715 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5717 struct seq_file *m = filp->private_data;
5718 struct mdstat_info *mi = m->private;
5721 poll_wait(filp, &md_event_waiters, wait);
5723 /* always allow read */
5724 mask = POLLIN | POLLRDNORM;
5726 if (mi->event != atomic_read(&md_event_count))
5727 mask |= POLLERR | POLLPRI;
5731 static const struct file_operations md_seq_fops = {
5732 .owner = THIS_MODULE,
5733 .open = md_seq_open,
5735 .llseek = seq_lseek,
5736 .release = seq_release_private,
5737 .poll = mdstat_poll,
5740 int register_md_personality(struct mdk_personality *p)
5742 spin_lock(&pers_lock);
5743 list_add_tail(&p->list, &pers_list);
5744 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5745 spin_unlock(&pers_lock);
5749 int unregister_md_personality(struct mdk_personality *p)
5751 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5752 spin_lock(&pers_lock);
5753 list_del_init(&p->list);
5754 spin_unlock(&pers_lock);
5758 static int is_mddev_idle(mddev_t *mddev, int init)
5766 rdev_for_each_rcu(rdev, mddev) {
5767 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5768 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
5769 (int)part_stat_read(&disk->part0, sectors[1]) -
5770 atomic_read(&disk->sync_io);
5771 /* sync IO will cause sync_io to increase before the disk_stats
5772 * as sync_io is counted when a request starts, and
5773 * disk_stats is counted when it completes.
5774 * So resync activity will cause curr_events to be smaller than
5775 * when there was no such activity.
5776 * non-sync IO will cause disk_stat to increase without
5777 * increasing sync_io so curr_events will (eventually)
5778 * be larger than it was before. Once it becomes
5779 * substantially larger, the test below will cause
5780 * the array to appear non-idle, and resync will slow
5782 * If there is a lot of outstanding resync activity when
5783 * we set last_event to curr_events, then all that activity
5784 * completing might cause the array to appear non-idle
5785 * and resync will be slowed down even though there might
5786 * not have been non-resync activity. This will only
5787 * happen once though. 'last_events' will soon reflect
5788 * the state where there is little or no outstanding
5789 * resync requests, and further resync activity will
5790 * always make curr_events less than last_events.
5793 if (init || curr_events - rdev->last_events > 64) {
5794 rdev->last_events = curr_events;
5802 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5804 /* another "blocks" (512byte) blocks have been synced */
5805 atomic_sub(blocks, &mddev->recovery_active);
5806 wake_up(&mddev->recovery_wait);
5808 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5809 md_wakeup_thread(mddev->thread);
5810 // stop recovery, signal do_sync ....
5815 /* md_write_start(mddev, bi)
5816 * If we need to update some array metadata (e.g. 'active' flag
5817 * in superblock) before writing, schedule a superblock update
5818 * and wait for it to complete.
5820 void md_write_start(mddev_t *mddev, struct bio *bi)
5823 if (bio_data_dir(bi) != WRITE)
5826 BUG_ON(mddev->ro == 1);
5827 if (mddev->ro == 2) {
5828 /* need to switch to read/write */
5830 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5831 md_wakeup_thread(mddev->thread);
5832 md_wakeup_thread(mddev->sync_thread);
5835 atomic_inc(&mddev->writes_pending);
5836 if (mddev->safemode == 1)
5837 mddev->safemode = 0;
5838 if (mddev->in_sync) {
5839 spin_lock_irq(&mddev->write_lock);
5840 if (mddev->in_sync) {
5842 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5843 md_wakeup_thread(mddev->thread);
5846 spin_unlock_irq(&mddev->write_lock);
5849 sysfs_notify_dirent(mddev->sysfs_state);
5850 wait_event(mddev->sb_wait,
5851 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5852 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5855 void md_write_end(mddev_t *mddev)
5857 if (atomic_dec_and_test(&mddev->writes_pending)) {
5858 if (mddev->safemode == 2)
5859 md_wakeup_thread(mddev->thread);
5860 else if (mddev->safemode_delay)
5861 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5865 /* md_allow_write(mddev)
5866 * Calling this ensures that the array is marked 'active' so that writes
5867 * may proceed without blocking. It is important to call this before
5868 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5869 * Must be called with mddev_lock held.
5871 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5872 * is dropped, so return -EAGAIN after notifying userspace.
5874 int md_allow_write(mddev_t *mddev)
5880 if (!mddev->pers->sync_request)
5883 spin_lock_irq(&mddev->write_lock);
5884 if (mddev->in_sync) {
5886 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5887 if (mddev->safemode_delay &&
5888 mddev->safemode == 0)
5889 mddev->safemode = 1;
5890 spin_unlock_irq(&mddev->write_lock);
5891 md_update_sb(mddev, 0);
5892 sysfs_notify_dirent(mddev->sysfs_state);
5894 spin_unlock_irq(&mddev->write_lock);
5896 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5901 EXPORT_SYMBOL_GPL(md_allow_write);
5903 #define SYNC_MARKS 10
5904 #define SYNC_MARK_STEP (3*HZ)
5905 void md_do_sync(mddev_t *mddev)
5908 unsigned int currspeed = 0,
5910 sector_t max_sectors,j, io_sectors;
5911 unsigned long mark[SYNC_MARKS];
5912 sector_t mark_cnt[SYNC_MARKS];
5914 struct list_head *tmp;
5915 sector_t last_check;
5920 /* just incase thread restarts... */
5921 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5923 if (mddev->ro) /* never try to sync a read-only array */
5926 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5927 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5928 desc = "data-check";
5929 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5930 desc = "requested-resync";
5933 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5938 /* we overload curr_resync somewhat here.
5939 * 0 == not engaged in resync at all
5940 * 2 == checking that there is no conflict with another sync
5941 * 1 == like 2, but have yielded to allow conflicting resync to
5943 * other == active in resync - this many blocks
5945 * Before starting a resync we must have set curr_resync to
5946 * 2, and then checked that every "conflicting" array has curr_resync
5947 * less than ours. When we find one that is the same or higher
5948 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5949 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5950 * This will mean we have to start checking from the beginning again.
5955 mddev->curr_resync = 2;
5958 if (kthread_should_stop()) {
5959 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5962 for_each_mddev(mddev2, tmp) {
5963 if (mddev2 == mddev)
5965 if (!mddev->parallel_resync
5966 && mddev2->curr_resync
5967 && match_mddev_units(mddev, mddev2)) {
5969 if (mddev < mddev2 && mddev->curr_resync == 2) {
5970 /* arbitrarily yield */
5971 mddev->curr_resync = 1;
5972 wake_up(&resync_wait);
5974 if (mddev > mddev2 && mddev->curr_resync == 1)
5975 /* no need to wait here, we can wait the next
5976 * time 'round when curr_resync == 2
5979 /* We need to wait 'interruptible' so as not to
5980 * contribute to the load average, and not to
5981 * be caught by 'softlockup'
5983 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5984 if (!kthread_should_stop() &&
5985 mddev2->curr_resync >= mddev->curr_resync) {
5986 printk(KERN_INFO "md: delaying %s of %s"
5987 " until %s has finished (they"
5988 " share one or more physical units)\n",
5989 desc, mdname(mddev), mdname(mddev2));
5991 if (signal_pending(current))
5992 flush_signals(current);
5994 finish_wait(&resync_wait, &wq);
5997 finish_wait(&resync_wait, &wq);
6000 } while (mddev->curr_resync < 2);
6003 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6004 /* resync follows the size requested by the personality,
6005 * which defaults to physical size, but can be virtual size
6007 max_sectors = mddev->resync_max_sectors;
6008 mddev->resync_mismatches = 0;
6009 /* we don't use the checkpoint if there's a bitmap */
6010 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6011 j = mddev->resync_min;
6012 else if (!mddev->bitmap)
6013 j = mddev->recovery_cp;
6015 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6016 max_sectors = mddev->size << 1;
6018 /* recovery follows the physical size of devices */
6019 max_sectors = mddev->size << 1;
6021 list_for_each_entry(rdev, &mddev->disks, same_set)
6022 if (rdev->raid_disk >= 0 &&
6023 !test_bit(Faulty, &rdev->flags) &&
6024 !test_bit(In_sync, &rdev->flags) &&
6025 rdev->recovery_offset < j)
6026 j = rdev->recovery_offset;
6029 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6030 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6031 " %d KB/sec/disk.\n", speed_min(mddev));
6032 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6033 "(but not more than %d KB/sec) for %s.\n",
6034 speed_max(mddev), desc);
6036 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6039 for (m = 0; m < SYNC_MARKS; m++) {
6041 mark_cnt[m] = io_sectors;
6044 mddev->resync_mark = mark[last_mark];
6045 mddev->resync_mark_cnt = mark_cnt[last_mark];
6048 * Tune reconstruction:
6050 window = 32*(PAGE_SIZE/512);
6051 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6052 window/2,(unsigned long long) max_sectors/2);
6054 atomic_set(&mddev->recovery_active, 0);
6059 "md: resuming %s of %s from checkpoint.\n",
6060 desc, mdname(mddev));
6061 mddev->curr_resync = j;
6064 while (j < max_sectors) {
6068 if (j >= mddev->resync_max) {
6069 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6070 wait_event(mddev->recovery_wait,
6071 mddev->resync_max > j
6072 || kthread_should_stop());
6074 if (kthread_should_stop())
6076 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6077 currspeed < speed_min(mddev));
6079 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6083 if (!skipped) { /* actual IO requested */
6084 io_sectors += sectors;
6085 atomic_add(sectors, &mddev->recovery_active);
6089 if (j>1) mddev->curr_resync = j;
6090 mddev->curr_mark_cnt = io_sectors;
6091 if (last_check == 0)
6092 /* this is the earliers that rebuilt will be
6093 * visible in /proc/mdstat
6095 md_new_event(mddev);
6097 if (last_check + window > io_sectors || j == max_sectors)
6100 last_check = io_sectors;
6102 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6106 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6108 int next = (last_mark+1) % SYNC_MARKS;
6110 mddev->resync_mark = mark[next];
6111 mddev->resync_mark_cnt = mark_cnt[next];
6112 mark[next] = jiffies;
6113 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6118 if (kthread_should_stop())
6123 * this loop exits only if either when we are slower than
6124 * the 'hard' speed limit, or the system was IO-idle for
6126 * the system might be non-idle CPU-wise, but we only care
6127 * about not overloading the IO subsystem. (things like an
6128 * e2fsck being done on the RAID array should execute fast)
6130 blk_unplug(mddev->queue);
6133 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6134 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6136 if (currspeed > speed_min(mddev)) {
6137 if ((currspeed > speed_max(mddev)) ||
6138 !is_mddev_idle(mddev, 0)) {
6144 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6146 * this also signals 'finished resyncing' to md_stop
6149 blk_unplug(mddev->queue);
6151 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6153 /* tell personality that we are finished */
6154 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6156 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6157 mddev->curr_resync > 2) {
6158 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6159 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6160 if (mddev->curr_resync >= mddev->recovery_cp) {
6162 "md: checkpointing %s of %s.\n",
6163 desc, mdname(mddev));
6164 mddev->recovery_cp = mddev->curr_resync;
6167 mddev->recovery_cp = MaxSector;
6169 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6170 mddev->curr_resync = MaxSector;
6171 list_for_each_entry(rdev, &mddev->disks, same_set)
6172 if (rdev->raid_disk >= 0 &&
6173 !test_bit(Faulty, &rdev->flags) &&
6174 !test_bit(In_sync, &rdev->flags) &&
6175 rdev->recovery_offset < mddev->curr_resync)
6176 rdev->recovery_offset = mddev->curr_resync;
6179 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6182 mddev->curr_resync = 0;
6183 mddev->resync_min = 0;
6184 mddev->resync_max = MaxSector;
6185 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6186 wake_up(&resync_wait);
6187 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6188 md_wakeup_thread(mddev->thread);
6193 * got a signal, exit.
6196 "md: md_do_sync() got signal ... exiting\n");
6197 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6201 EXPORT_SYMBOL_GPL(md_do_sync);
6204 static int remove_and_add_spares(mddev_t *mddev)
6209 list_for_each_entry(rdev, &mddev->disks, same_set)
6210 if (rdev->raid_disk >= 0 &&
6211 !test_bit(Blocked, &rdev->flags) &&
6212 (test_bit(Faulty, &rdev->flags) ||
6213 ! test_bit(In_sync, &rdev->flags)) &&
6214 atomic_read(&rdev->nr_pending)==0) {
6215 if (mddev->pers->hot_remove_disk(
6216 mddev, rdev->raid_disk)==0) {
6218 sprintf(nm,"rd%d", rdev->raid_disk);
6219 sysfs_remove_link(&mddev->kobj, nm);
6220 rdev->raid_disk = -1;
6224 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6225 list_for_each_entry(rdev, &mddev->disks, same_set) {
6226 if (rdev->raid_disk >= 0 &&
6227 !test_bit(In_sync, &rdev->flags) &&
6228 !test_bit(Blocked, &rdev->flags))
6230 if (rdev->raid_disk < 0
6231 && !test_bit(Faulty, &rdev->flags)) {
6232 rdev->recovery_offset = 0;
6234 hot_add_disk(mddev, rdev) == 0) {
6236 sprintf(nm, "rd%d", rdev->raid_disk);
6237 if (sysfs_create_link(&mddev->kobj,
6240 "md: cannot register "
6244 md_new_event(mddev);
6253 * This routine is regularly called by all per-raid-array threads to
6254 * deal with generic issues like resync and super-block update.
6255 * Raid personalities that don't have a thread (linear/raid0) do not
6256 * need this as they never do any recovery or update the superblock.
6258 * It does not do any resync itself, but rather "forks" off other threads
6259 * to do that as needed.
6260 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6261 * "->recovery" and create a thread at ->sync_thread.
6262 * When the thread finishes it sets MD_RECOVERY_DONE
6263 * and wakeups up this thread which will reap the thread and finish up.
6264 * This thread also removes any faulty devices (with nr_pending == 0).
6266 * The overall approach is:
6267 * 1/ if the superblock needs updating, update it.
6268 * 2/ If a recovery thread is running, don't do anything else.
6269 * 3/ If recovery has finished, clean up, possibly marking spares active.
6270 * 4/ If there are any faulty devices, remove them.
6271 * 5/ If array is degraded, try to add spares devices
6272 * 6/ If array has spares or is not in-sync, start a resync thread.
6274 void md_check_recovery(mddev_t *mddev)
6280 bitmap_daemon_work(mddev->bitmap);
6285 if (signal_pending(current)) {
6286 if (mddev->pers->sync_request && !mddev->external) {
6287 printk(KERN_INFO "md: %s in immediate safe mode\n",
6289 mddev->safemode = 2;
6291 flush_signals(current);
6294 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6297 (mddev->flags && !mddev->external) ||
6298 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6299 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6300 (mddev->external == 0 && mddev->safemode == 1) ||
6301 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6302 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6306 if (mddev_trylock(mddev)) {
6310 /* Only thing we do on a ro array is remove
6313 remove_and_add_spares(mddev);
6314 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6318 if (!mddev->external) {
6320 spin_lock_irq(&mddev->write_lock);
6321 if (mddev->safemode &&
6322 !atomic_read(&mddev->writes_pending) &&
6324 mddev->recovery_cp == MaxSector) {
6327 if (mddev->persistent)
6328 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6330 if (mddev->safemode == 1)
6331 mddev->safemode = 0;
6332 spin_unlock_irq(&mddev->write_lock);
6334 sysfs_notify_dirent(mddev->sysfs_state);
6338 md_update_sb(mddev, 0);
6340 list_for_each_entry(rdev, &mddev->disks, same_set)
6341 if (test_and_clear_bit(StateChanged, &rdev->flags))
6342 sysfs_notify_dirent(rdev->sysfs_state);
6345 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6346 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6347 /* resync/recovery still happening */
6348 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6351 if (mddev->sync_thread) {
6352 /* resync has finished, collect result */
6353 md_unregister_thread(mddev->sync_thread);
6354 mddev->sync_thread = NULL;
6355 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6356 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6358 /* activate any spares */
6359 if (mddev->pers->spare_active(mddev))
6360 sysfs_notify(&mddev->kobj, NULL,
6363 md_update_sb(mddev, 1);
6365 /* if array is no-longer degraded, then any saved_raid_disk
6366 * information must be scrapped
6368 if (!mddev->degraded)
6369 list_for_each_entry(rdev, &mddev->disks, same_set)
6370 rdev->saved_raid_disk = -1;
6372 mddev->recovery = 0;
6373 /* flag recovery needed just to double check */
6374 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6375 sysfs_notify_dirent(mddev->sysfs_action);
6376 md_new_event(mddev);
6379 /* Set RUNNING before clearing NEEDED to avoid
6380 * any transients in the value of "sync_action".
6382 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6383 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6384 /* Clear some bits that don't mean anything, but
6387 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6388 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6390 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6392 /* no recovery is running.
6393 * remove any failed drives, then
6394 * add spares if possible.
6395 * Spare are also removed and re-added, to allow
6396 * the personality to fail the re-add.
6399 if (mddev->reshape_position != MaxSector) {
6400 if (mddev->pers->check_reshape(mddev) != 0)
6401 /* Cannot proceed */
6403 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6404 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6405 } else if ((spares = remove_and_add_spares(mddev))) {
6406 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6407 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6408 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6409 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6410 } else if (mddev->recovery_cp < MaxSector) {
6411 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6412 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6413 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6414 /* nothing to be done ... */
6417 if (mddev->pers->sync_request) {
6418 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6419 /* We are adding a device or devices to an array
6420 * which has the bitmap stored on all devices.
6421 * So make sure all bitmap pages get written
6423 bitmap_write_all(mddev->bitmap);
6425 mddev->sync_thread = md_register_thread(md_do_sync,
6428 if (!mddev->sync_thread) {
6429 printk(KERN_ERR "%s: could not start resync"
6432 /* leave the spares where they are, it shouldn't hurt */
6433 mddev->recovery = 0;
6435 md_wakeup_thread(mddev->sync_thread);
6436 sysfs_notify_dirent(mddev->sysfs_action);
6437 md_new_event(mddev);
6440 if (!mddev->sync_thread) {
6441 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6442 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6444 if (mddev->sysfs_action)
6445 sysfs_notify_dirent(mddev->sysfs_action);
6447 mddev_unlock(mddev);
6451 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6453 sysfs_notify_dirent(rdev->sysfs_state);
6454 wait_event_timeout(rdev->blocked_wait,
6455 !test_bit(Blocked, &rdev->flags),
6456 msecs_to_jiffies(5000));
6457 rdev_dec_pending(rdev, mddev);
6459 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6461 static int md_notify_reboot(struct notifier_block *this,
6462 unsigned long code, void *x)
6464 struct list_head *tmp;
6467 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6469 printk(KERN_INFO "md: stopping all md devices.\n");
6471 for_each_mddev(mddev, tmp)
6472 if (mddev_trylock(mddev)) {
6473 /* Force a switch to readonly even array
6474 * appears to still be in use. Hence
6477 do_md_stop(mddev, 1, 100);
6478 mddev_unlock(mddev);
6481 * certain more exotic SCSI devices are known to be
6482 * volatile wrt too early system reboots. While the
6483 * right place to handle this issue is the given
6484 * driver, we do want to have a safe RAID driver ...
6491 static struct notifier_block md_notifier = {
6492 .notifier_call = md_notify_reboot,
6494 .priority = INT_MAX, /* before any real devices */
6497 static void md_geninit(void)
6499 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6501 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6504 static int __init md_init(void)
6506 if (register_blkdev(MAJOR_NR, "md"))
6508 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6509 unregister_blkdev(MAJOR_NR, "md");
6512 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6513 md_probe, NULL, NULL);
6514 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6515 md_probe, NULL, NULL);
6517 register_reboot_notifier(&md_notifier);
6518 raid_table_header = register_sysctl_table(raid_root_table);
6528 * Searches all registered partitions for autorun RAID arrays
6532 static LIST_HEAD(all_detected_devices);
6533 struct detected_devices_node {
6534 struct list_head list;
6538 void md_autodetect_dev(dev_t dev)
6540 struct detected_devices_node *node_detected_dev;
6542 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6543 if (node_detected_dev) {
6544 node_detected_dev->dev = dev;
6545 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6547 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6548 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6553 static void autostart_arrays(int part)
6556 struct detected_devices_node *node_detected_dev;
6558 int i_scanned, i_passed;
6563 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6565 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6567 node_detected_dev = list_entry(all_detected_devices.next,
6568 struct detected_devices_node, list);
6569 list_del(&node_detected_dev->list);
6570 dev = node_detected_dev->dev;
6571 kfree(node_detected_dev);
6572 rdev = md_import_device(dev,0, 90);
6576 if (test_bit(Faulty, &rdev->flags)) {
6580 set_bit(AutoDetected, &rdev->flags);
6581 list_add(&rdev->same_set, &pending_raid_disks);
6585 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6586 i_scanned, i_passed);
6588 autorun_devices(part);
6591 #endif /* !MODULE */
6593 static __exit void md_exit(void)
6596 struct list_head *tmp;
6598 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6599 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6601 unregister_blkdev(MAJOR_NR,"md");
6602 unregister_blkdev(mdp_major, "mdp");
6603 unregister_reboot_notifier(&md_notifier);
6604 unregister_sysctl_table(raid_table_header);
6605 remove_proc_entry("mdstat", NULL);
6606 for_each_mddev(mddev, tmp) {
6607 export_array(mddev);
6608 mddev->hold_active = 0;
6612 subsys_initcall(md_init);
6613 module_exit(md_exit)
6615 static int get_ro(char *buffer, struct kernel_param *kp)
6617 return sprintf(buffer, "%d", start_readonly);
6619 static int set_ro(const char *val, struct kernel_param *kp)
6622 int num = simple_strtoul(val, &e, 10);
6623 if (*val && (*e == '\0' || *e == '\n')) {
6624 start_readonly = num;
6630 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6631 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6633 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6635 EXPORT_SYMBOL(register_md_personality);
6636 EXPORT_SYMBOL(unregister_md_personality);
6637 EXPORT_SYMBOL(md_error);
6638 EXPORT_SYMBOL(md_done_sync);
6639 EXPORT_SYMBOL(md_write_start);
6640 EXPORT_SYMBOL(md_write_end);
6641 EXPORT_SYMBOL(md_register_thread);
6642 EXPORT_SYMBOL(md_unregister_thread);
6643 EXPORT_SYMBOL(md_wakeup_thread);
6644 EXPORT_SYMBOL(md_check_recovery);
6645 MODULE_LICENSE("GPL");
6647 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);