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/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.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>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
58 static void autostart_arrays(int part);
61 static LIST_HEAD(pers_list);
62 static DEFINE_SPINLOCK(pers_lock);
64 static void md_print_devices(void);
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
72 * is 1000 KB/sec, so the extra system load does not show up that much.
73 * Increase it if you want to have more _guaranteed_ speed. Note that
74 * the RAID driver will use the maximum available bandwidth if the IO
75 * subsystem is idle. There is also an 'absolute maximum' reconstruction
76 * speed limit - in case reconstruction slows down your system despite
79 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
80 * or /sys/block/mdX/md/sync_speed_{min,max}
83 static int sysctl_speed_limit_min = 1000;
84 static int sysctl_speed_limit_max = 200000;
85 static inline int speed_min(mddev_t *mddev)
87 return mddev->sync_speed_min ?
88 mddev->sync_speed_min : sysctl_speed_limit_min;
91 static inline int speed_max(mddev_t *mddev)
93 return mddev->sync_speed_max ?
94 mddev->sync_speed_max : sysctl_speed_limit_max;
97 static struct ctl_table_header *raid_table_header;
99 static ctl_table raid_table[] = {
101 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
102 .procname = "speed_limit_min",
103 .data = &sysctl_speed_limit_min,
104 .maxlen = sizeof(int),
105 .mode = S_IRUGO|S_IWUSR,
106 .proc_handler = &proc_dointvec,
109 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
110 .procname = "speed_limit_max",
111 .data = &sysctl_speed_limit_max,
112 .maxlen = sizeof(int),
113 .mode = S_IRUGO|S_IWUSR,
114 .proc_handler = &proc_dointvec,
119 static ctl_table raid_dir_table[] = {
121 .ctl_name = DEV_RAID,
124 .mode = S_IRUGO|S_IXUGO,
130 static ctl_table raid_root_table[] = {
136 .child = raid_dir_table,
141 static struct block_device_operations md_fops;
143 static int start_readonly;
146 * We have a system wide 'event count' that is incremented
147 * on any 'interesting' event, and readers of /proc/mdstat
148 * can use 'poll' or 'select' to find out when the event
152 * start array, stop array, error, add device, remove device,
153 * start build, activate spare
155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
156 static atomic_t md_event_count;
157 void md_new_event(mddev_t *mddev)
159 atomic_inc(&md_event_count);
160 wake_up(&md_event_waiters);
162 EXPORT_SYMBOL_GPL(md_new_event);
164 /* Alternate version that can be called from interrupts
165 * when calling sysfs_notify isn't needed.
167 static void md_new_event_inintr(mddev_t *mddev)
169 atomic_inc(&md_event_count);
170 wake_up(&md_event_waiters);
174 * Enables to iterate over all existing md arrays
175 * all_mddevs_lock protects this list.
177 static LIST_HEAD(all_mddevs);
178 static DEFINE_SPINLOCK(all_mddevs_lock);
182 * iterates through all used mddevs in the system.
183 * We take care to grab the all_mddevs_lock whenever navigating
184 * the list, and to always hold a refcount when unlocked.
185 * Any code which breaks out of this loop while own
186 * a reference to the current mddev and must mddev_put it.
188 #define for_each_mddev(mddev,tmp) \
190 for (({ spin_lock(&all_mddevs_lock); \
191 tmp = all_mddevs.next; \
193 ({ if (tmp != &all_mddevs) \
194 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
195 spin_unlock(&all_mddevs_lock); \
196 if (mddev) mddev_put(mddev); \
197 mddev = list_entry(tmp, mddev_t, all_mddevs); \
198 tmp != &all_mddevs;}); \
199 ({ spin_lock(&all_mddevs_lock); \
204 /* Rather than calling directly into the personality make_request function,
205 * IO requests come here first so that we can check if the device is
206 * being suspended pending a reconfiguration.
207 * We hold a refcount over the call to ->make_request. By the time that
208 * call has finished, the bio has been linked into some internal structure
209 * and so is visible to ->quiesce(), so we don't need the refcount any more.
211 static int md_make_request(struct request_queue *q, struct bio *bio)
213 mddev_t *mddev = q->queuedata;
215 if (mddev == NULL || mddev->pers == NULL) {
220 if (mddev->suspended) {
223 prepare_to_wait(&mddev->sb_wait, &__wait,
224 TASK_UNINTERRUPTIBLE);
225 if (!mddev->suspended)
231 finish_wait(&mddev->sb_wait, &__wait);
233 atomic_inc(&mddev->active_io);
235 rv = mddev->pers->make_request(q, bio);
236 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
237 wake_up(&mddev->sb_wait);
242 static void mddev_suspend(mddev_t *mddev)
244 BUG_ON(mddev->suspended);
245 mddev->suspended = 1;
247 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
248 mddev->pers->quiesce(mddev, 1);
249 md_unregister_thread(mddev->thread);
250 mddev->thread = NULL;
251 /* we now know that no code is executing in the personality module,
252 * except possibly the tail end of a ->bi_end_io function, but that
253 * is certain to complete before the module has a chance to get
258 static void mddev_resume(mddev_t *mddev)
260 mddev->suspended = 0;
261 wake_up(&mddev->sb_wait);
262 mddev->pers->quiesce(mddev, 0);
266 static inline mddev_t *mddev_get(mddev_t *mddev)
268 atomic_inc(&mddev->active);
272 static void mddev_delayed_delete(struct work_struct *ws);
274 static void mddev_put(mddev_t *mddev)
276 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
278 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
279 !mddev->hold_active) {
280 list_del(&mddev->all_mddevs);
281 if (mddev->gendisk) {
282 /* we did a probe so need to clean up.
283 * Call schedule_work inside the spinlock
284 * so that flush_scheduled_work() after
285 * mddev_find will succeed in waiting for the
288 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
289 schedule_work(&mddev->del_work);
293 spin_unlock(&all_mddevs_lock);
296 static mddev_t * mddev_find(dev_t unit)
298 mddev_t *mddev, *new = NULL;
301 spin_lock(&all_mddevs_lock);
304 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
305 if (mddev->unit == unit) {
307 spin_unlock(&all_mddevs_lock);
313 list_add(&new->all_mddevs, &all_mddevs);
314 spin_unlock(&all_mddevs_lock);
315 new->hold_active = UNTIL_IOCTL;
319 /* find an unused unit number */
320 static int next_minor = 512;
321 int start = next_minor;
325 dev = MKDEV(MD_MAJOR, next_minor);
327 if (next_minor > MINORMASK)
329 if (next_minor == start) {
330 /* Oh dear, all in use. */
331 spin_unlock(&all_mddevs_lock);
337 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
338 if (mddev->unit == dev) {
344 new->md_minor = MINOR(dev);
345 new->hold_active = UNTIL_STOP;
346 list_add(&new->all_mddevs, &all_mddevs);
347 spin_unlock(&all_mddevs_lock);
350 spin_unlock(&all_mddevs_lock);
352 new = kzalloc(sizeof(*new), GFP_KERNEL);
357 if (MAJOR(unit) == MD_MAJOR)
358 new->md_minor = MINOR(unit);
360 new->md_minor = MINOR(unit) >> MdpMinorShift;
362 mutex_init(&new->reconfig_mutex);
363 INIT_LIST_HEAD(&new->disks);
364 INIT_LIST_HEAD(&new->all_mddevs);
365 init_timer(&new->safemode_timer);
366 atomic_set(&new->active, 1);
367 atomic_set(&new->openers, 0);
368 atomic_set(&new->active_io, 0);
369 spin_lock_init(&new->write_lock);
370 init_waitqueue_head(&new->sb_wait);
371 init_waitqueue_head(&new->recovery_wait);
372 new->reshape_position = MaxSector;
374 new->resync_max = MaxSector;
375 new->level = LEVEL_NONE;
380 static inline int mddev_lock(mddev_t * mddev)
382 return mutex_lock_interruptible(&mddev->reconfig_mutex);
385 static inline int mddev_is_locked(mddev_t *mddev)
387 return mutex_is_locked(&mddev->reconfig_mutex);
390 static inline int mddev_trylock(mddev_t * mddev)
392 return mutex_trylock(&mddev->reconfig_mutex);
395 static inline void mddev_unlock(mddev_t * mddev)
397 mutex_unlock(&mddev->reconfig_mutex);
399 md_wakeup_thread(mddev->thread);
402 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
406 list_for_each_entry(rdev, &mddev->disks, same_set)
407 if (rdev->desc_nr == nr)
413 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
417 list_for_each_entry(rdev, &mddev->disks, same_set)
418 if (rdev->bdev->bd_dev == dev)
424 static struct mdk_personality *find_pers(int level, char *clevel)
426 struct mdk_personality *pers;
427 list_for_each_entry(pers, &pers_list, list) {
428 if (level != LEVEL_NONE && pers->level == level)
430 if (strcmp(pers->name, clevel)==0)
436 /* return the offset of the super block in 512byte sectors */
437 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
439 sector_t num_sectors = bdev->bd_inode->i_size / 512;
440 return MD_NEW_SIZE_SECTORS(num_sectors);
443 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
445 sector_t num_sectors = rdev->sb_start;
448 unsigned chunk_sects = chunk_size>>9;
449 sector_div(num_sectors, chunk_sects);
450 num_sectors *= chunk_sects;
455 static int alloc_disk_sb(mdk_rdev_t * rdev)
460 rdev->sb_page = alloc_page(GFP_KERNEL);
461 if (!rdev->sb_page) {
462 printk(KERN_ALERT "md: out of memory.\n");
469 static void free_disk_sb(mdk_rdev_t * rdev)
472 put_page(rdev->sb_page);
474 rdev->sb_page = NULL;
481 static void super_written(struct bio *bio, int error)
483 mdk_rdev_t *rdev = bio->bi_private;
484 mddev_t *mddev = rdev->mddev;
486 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
487 printk("md: super_written gets error=%d, uptodate=%d\n",
488 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
489 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
490 md_error(mddev, rdev);
493 if (atomic_dec_and_test(&mddev->pending_writes))
494 wake_up(&mddev->sb_wait);
498 static void super_written_barrier(struct bio *bio, int error)
500 struct bio *bio2 = bio->bi_private;
501 mdk_rdev_t *rdev = bio2->bi_private;
502 mddev_t *mddev = rdev->mddev;
504 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
505 error == -EOPNOTSUPP) {
507 /* barriers don't appear to be supported :-( */
508 set_bit(BarriersNotsupp, &rdev->flags);
509 mddev->barriers_work = 0;
510 spin_lock_irqsave(&mddev->write_lock, flags);
511 bio2->bi_next = mddev->biolist;
512 mddev->biolist = bio2;
513 spin_unlock_irqrestore(&mddev->write_lock, flags);
514 wake_up(&mddev->sb_wait);
518 bio->bi_private = rdev;
519 super_written(bio, error);
523 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
524 sector_t sector, int size, struct page *page)
526 /* write first size bytes of page to sector of rdev
527 * Increment mddev->pending_writes before returning
528 * and decrement it on completion, waking up sb_wait
529 * if zero is reached.
530 * If an error occurred, call md_error
532 * As we might need to resubmit the request if BIO_RW_BARRIER
533 * causes ENOTSUPP, we allocate a spare bio...
535 struct bio *bio = bio_alloc(GFP_NOIO, 1);
536 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
538 bio->bi_bdev = rdev->bdev;
539 bio->bi_sector = sector;
540 bio_add_page(bio, page, size, 0);
541 bio->bi_private = rdev;
542 bio->bi_end_io = super_written;
545 atomic_inc(&mddev->pending_writes);
546 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
548 rw |= (1<<BIO_RW_BARRIER);
549 rbio = bio_clone(bio, GFP_NOIO);
550 rbio->bi_private = bio;
551 rbio->bi_end_io = super_written_barrier;
552 submit_bio(rw, rbio);
557 void md_super_wait(mddev_t *mddev)
559 /* wait for all superblock writes that were scheduled to complete.
560 * if any had to be retried (due to BARRIER problems), retry them
564 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
565 if (atomic_read(&mddev->pending_writes)==0)
567 while (mddev->biolist) {
569 spin_lock_irq(&mddev->write_lock);
570 bio = mddev->biolist;
571 mddev->biolist = bio->bi_next ;
573 spin_unlock_irq(&mddev->write_lock);
574 submit_bio(bio->bi_rw, bio);
578 finish_wait(&mddev->sb_wait, &wq);
581 static void bi_complete(struct bio *bio, int error)
583 complete((struct completion*)bio->bi_private);
586 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
587 struct page *page, int rw)
589 struct bio *bio = bio_alloc(GFP_NOIO, 1);
590 struct completion event;
593 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
596 bio->bi_sector = sector;
597 bio_add_page(bio, page, size, 0);
598 init_completion(&event);
599 bio->bi_private = &event;
600 bio->bi_end_io = bi_complete;
602 wait_for_completion(&event);
604 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
608 EXPORT_SYMBOL_GPL(sync_page_io);
610 static int read_disk_sb(mdk_rdev_t * rdev, int size)
612 char b[BDEVNAME_SIZE];
613 if (!rdev->sb_page) {
621 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
627 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
628 bdevname(rdev->bdev,b));
632 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
634 return sb1->set_uuid0 == sb2->set_uuid0 &&
635 sb1->set_uuid1 == sb2->set_uuid1 &&
636 sb1->set_uuid2 == sb2->set_uuid2 &&
637 sb1->set_uuid3 == sb2->set_uuid3;
640 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
643 mdp_super_t *tmp1, *tmp2;
645 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
646 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
648 if (!tmp1 || !tmp2) {
650 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
658 * nr_disks is not constant
663 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
671 static u32 md_csum_fold(u32 csum)
673 csum = (csum & 0xffff) + (csum >> 16);
674 return (csum & 0xffff) + (csum >> 16);
677 static unsigned int calc_sb_csum(mdp_super_t * sb)
680 u32 *sb32 = (u32*)sb;
682 unsigned int disk_csum, csum;
684 disk_csum = sb->sb_csum;
687 for (i = 0; i < MD_SB_BYTES/4 ; i++)
689 csum = (newcsum & 0xffffffff) + (newcsum>>32);
693 /* This used to use csum_partial, which was wrong for several
694 * reasons including that different results are returned on
695 * different architectures. It isn't critical that we get exactly
696 * the same return value as before (we always csum_fold before
697 * testing, and that removes any differences). However as we
698 * know that csum_partial always returned a 16bit value on
699 * alphas, do a fold to maximise conformity to previous behaviour.
701 sb->sb_csum = md_csum_fold(disk_csum);
703 sb->sb_csum = disk_csum;
710 * Handle superblock details.
711 * We want to be able to handle multiple superblock formats
712 * so we have a common interface to them all, and an array of
713 * different handlers.
714 * We rely on user-space to write the initial superblock, and support
715 * reading and updating of superblocks.
716 * Interface methods are:
717 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
718 * loads and validates a superblock on dev.
719 * if refdev != NULL, compare superblocks on both devices
721 * 0 - dev has a superblock that is compatible with refdev
722 * 1 - dev has a superblock that is compatible and newer than refdev
723 * so dev should be used as the refdev in future
724 * -EINVAL superblock incompatible or invalid
725 * -othererror e.g. -EIO
727 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
728 * Verify that dev is acceptable into mddev.
729 * The first time, mddev->raid_disks will be 0, and data from
730 * dev should be merged in. Subsequent calls check that dev
731 * is new enough. Return 0 or -EINVAL
733 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
734 * Update the superblock for rdev with data in mddev
735 * This does not write to disc.
741 struct module *owner;
742 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
744 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
745 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
746 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
747 sector_t num_sectors);
751 * load_super for 0.90.0
753 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
755 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
760 * Calculate the position of the superblock (512byte sectors),
761 * it's at the end of the disk.
763 * It also happens to be a multiple of 4Kb.
765 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
767 ret = read_disk_sb(rdev, MD_SB_BYTES);
772 bdevname(rdev->bdev, b);
773 sb = (mdp_super_t*)page_address(rdev->sb_page);
775 if (sb->md_magic != MD_SB_MAGIC) {
776 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
781 if (sb->major_version != 0 ||
782 sb->minor_version < 90 ||
783 sb->minor_version > 91) {
784 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
785 sb->major_version, sb->minor_version,
790 if (sb->raid_disks <= 0)
793 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
794 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
799 rdev->preferred_minor = sb->md_minor;
800 rdev->data_offset = 0;
801 rdev->sb_size = MD_SB_BYTES;
803 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
804 if (sb->level != 1 && sb->level != 4
805 && sb->level != 5 && sb->level != 6
806 && sb->level != 10) {
807 /* FIXME use a better test */
809 "md: bitmaps not supported for this level.\n");
814 if (sb->level == LEVEL_MULTIPATH)
817 rdev->desc_nr = sb->this_disk.number;
823 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
824 if (!uuid_equal(refsb, sb)) {
825 printk(KERN_WARNING "md: %s has different UUID to %s\n",
826 b, bdevname(refdev->bdev,b2));
829 if (!sb_equal(refsb, sb)) {
830 printk(KERN_WARNING "md: %s has same UUID"
831 " but different superblock to %s\n",
832 b, bdevname(refdev->bdev, b2));
836 ev2 = md_event(refsb);
842 rdev->sectors = calc_num_sectors(rdev, sb->chunk_size);
844 if (rdev->sectors < sb->size * 2 && sb->level > 1)
845 /* "this cannot possibly happen" ... */
853 * validate_super for 0.90.0
855 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
858 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
859 __u64 ev1 = md_event(sb);
861 rdev->raid_disk = -1;
862 clear_bit(Faulty, &rdev->flags);
863 clear_bit(In_sync, &rdev->flags);
864 clear_bit(WriteMostly, &rdev->flags);
865 clear_bit(BarriersNotsupp, &rdev->flags);
867 if (mddev->raid_disks == 0) {
868 mddev->major_version = 0;
869 mddev->minor_version = sb->minor_version;
870 mddev->patch_version = sb->patch_version;
872 mddev->chunk_sectors = sb->chunk_size >> 9;
873 mddev->ctime = sb->ctime;
874 mddev->utime = sb->utime;
875 mddev->level = sb->level;
876 mddev->clevel[0] = 0;
877 mddev->layout = sb->layout;
878 mddev->raid_disks = sb->raid_disks;
879 mddev->dev_sectors = sb->size * 2;
881 mddev->bitmap_offset = 0;
882 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
884 if (mddev->minor_version >= 91) {
885 mddev->reshape_position = sb->reshape_position;
886 mddev->delta_disks = sb->delta_disks;
887 mddev->new_level = sb->new_level;
888 mddev->new_layout = sb->new_layout;
889 mddev->new_chunk = sb->new_chunk;
891 mddev->reshape_position = MaxSector;
892 mddev->delta_disks = 0;
893 mddev->new_level = mddev->level;
894 mddev->new_layout = mddev->layout;
895 mddev->new_chunk = mddev->chunk_sectors << 9;
898 if (sb->state & (1<<MD_SB_CLEAN))
899 mddev->recovery_cp = MaxSector;
901 if (sb->events_hi == sb->cp_events_hi &&
902 sb->events_lo == sb->cp_events_lo) {
903 mddev->recovery_cp = sb->recovery_cp;
905 mddev->recovery_cp = 0;
908 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
909 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
910 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
911 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
913 mddev->max_disks = MD_SB_DISKS;
915 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
916 mddev->bitmap_file == NULL)
917 mddev->bitmap_offset = mddev->default_bitmap_offset;
919 } else if (mddev->pers == NULL) {
920 /* Insist on good event counter while assembling */
922 if (ev1 < mddev->events)
924 } else if (mddev->bitmap) {
925 /* if adding to array with a bitmap, then we can accept an
926 * older device ... but not too old.
928 if (ev1 < mddev->bitmap->events_cleared)
931 if (ev1 < mddev->events)
932 /* just a hot-add of a new device, leave raid_disk at -1 */
936 if (mddev->level != LEVEL_MULTIPATH) {
937 desc = sb->disks + rdev->desc_nr;
939 if (desc->state & (1<<MD_DISK_FAULTY))
940 set_bit(Faulty, &rdev->flags);
941 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
942 desc->raid_disk < mddev->raid_disks */) {
943 set_bit(In_sync, &rdev->flags);
944 rdev->raid_disk = desc->raid_disk;
946 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
947 set_bit(WriteMostly, &rdev->flags);
948 } else /* MULTIPATH are always insync */
949 set_bit(In_sync, &rdev->flags);
954 * sync_super for 0.90.0
956 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
960 int next_spare = mddev->raid_disks;
963 /* make rdev->sb match mddev data..
966 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
967 * 3/ any empty disks < next_spare become removed
969 * disks[0] gets initialised to REMOVED because
970 * we cannot be sure from other fields if it has
971 * been initialised or not.
974 int active=0, working=0,failed=0,spare=0,nr_disks=0;
976 rdev->sb_size = MD_SB_BYTES;
978 sb = (mdp_super_t*)page_address(rdev->sb_page);
980 memset(sb, 0, sizeof(*sb));
982 sb->md_magic = MD_SB_MAGIC;
983 sb->major_version = mddev->major_version;
984 sb->patch_version = mddev->patch_version;
985 sb->gvalid_words = 0; /* ignored */
986 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
987 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
988 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
989 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
991 sb->ctime = mddev->ctime;
992 sb->level = mddev->level;
993 sb->size = mddev->dev_sectors / 2;
994 sb->raid_disks = mddev->raid_disks;
995 sb->md_minor = mddev->md_minor;
996 sb->not_persistent = 0;
997 sb->utime = mddev->utime;
999 sb->events_hi = (mddev->events>>32);
1000 sb->events_lo = (u32)mddev->events;
1002 if (mddev->reshape_position == MaxSector)
1003 sb->minor_version = 90;
1005 sb->minor_version = 91;
1006 sb->reshape_position = mddev->reshape_position;
1007 sb->new_level = mddev->new_level;
1008 sb->delta_disks = mddev->delta_disks;
1009 sb->new_layout = mddev->new_layout;
1010 sb->new_chunk = mddev->new_chunk;
1012 mddev->minor_version = sb->minor_version;
1015 sb->recovery_cp = mddev->recovery_cp;
1016 sb->cp_events_hi = (mddev->events>>32);
1017 sb->cp_events_lo = (u32)mddev->events;
1018 if (mddev->recovery_cp == MaxSector)
1019 sb->state = (1<< MD_SB_CLEAN);
1021 sb->recovery_cp = 0;
1023 sb->layout = mddev->layout;
1024 sb->chunk_size = mddev->chunk_sectors << 9;
1026 if (mddev->bitmap && mddev->bitmap_file == NULL)
1027 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1029 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1030 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1033 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
1034 && !test_bit(Faulty, &rdev2->flags))
1035 desc_nr = rdev2->raid_disk;
1037 desc_nr = next_spare++;
1038 rdev2->desc_nr = desc_nr;
1039 d = &sb->disks[rdev2->desc_nr];
1041 d->number = rdev2->desc_nr;
1042 d->major = MAJOR(rdev2->bdev->bd_dev);
1043 d->minor = MINOR(rdev2->bdev->bd_dev);
1044 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
1045 && !test_bit(Faulty, &rdev2->flags))
1046 d->raid_disk = rdev2->raid_disk;
1048 d->raid_disk = rdev2->desc_nr; /* compatibility */
1049 if (test_bit(Faulty, &rdev2->flags))
1050 d->state = (1<<MD_DISK_FAULTY);
1051 else if (test_bit(In_sync, &rdev2->flags)) {
1052 d->state = (1<<MD_DISK_ACTIVE);
1053 d->state |= (1<<MD_DISK_SYNC);
1061 if (test_bit(WriteMostly, &rdev2->flags))
1062 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1064 /* now set the "removed" and "faulty" bits on any missing devices */
1065 for (i=0 ; i < mddev->raid_disks ; i++) {
1066 mdp_disk_t *d = &sb->disks[i];
1067 if (d->state == 0 && d->number == 0) {
1070 d->state = (1<<MD_DISK_REMOVED);
1071 d->state |= (1<<MD_DISK_FAULTY);
1075 sb->nr_disks = nr_disks;
1076 sb->active_disks = active;
1077 sb->working_disks = working;
1078 sb->failed_disks = failed;
1079 sb->spare_disks = spare;
1081 sb->this_disk = sb->disks[rdev->desc_nr];
1082 sb->sb_csum = calc_sb_csum(sb);
1086 * rdev_size_change for 0.90.0
1088 static unsigned long long
1089 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1091 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1092 return 0; /* component must fit device */
1093 if (rdev->mddev->bitmap_offset)
1094 return 0; /* can't move bitmap */
1095 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1096 if (!num_sectors || num_sectors > rdev->sb_start)
1097 num_sectors = rdev->sb_start;
1098 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1100 md_super_wait(rdev->mddev);
1101 return num_sectors / 2; /* kB for sysfs */
1106 * version 1 superblock
1109 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1113 unsigned long long newcsum;
1114 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1115 __le32 *isuper = (__le32*)sb;
1118 disk_csum = sb->sb_csum;
1121 for (i=0; size>=4; size -= 4 )
1122 newcsum += le32_to_cpu(*isuper++);
1125 newcsum += le16_to_cpu(*(__le16*) isuper);
1127 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1128 sb->sb_csum = disk_csum;
1129 return cpu_to_le32(csum);
1132 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1134 struct mdp_superblock_1 *sb;
1137 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1141 * Calculate the position of the superblock in 512byte sectors.
1142 * It is always aligned to a 4K boundary and
1143 * depeding on minor_version, it can be:
1144 * 0: At least 8K, but less than 12K, from end of device
1145 * 1: At start of device
1146 * 2: 4K from start of device.
1148 switch(minor_version) {
1150 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1152 sb_start &= ~(sector_t)(4*2-1);
1163 rdev->sb_start = sb_start;
1165 /* superblock is rarely larger than 1K, but it can be larger,
1166 * and it is safe to read 4k, so we do that
1168 ret = read_disk_sb(rdev, 4096);
1169 if (ret) return ret;
1172 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1174 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1175 sb->major_version != cpu_to_le32(1) ||
1176 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1177 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1178 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1181 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1182 printk("md: invalid superblock checksum on %s\n",
1183 bdevname(rdev->bdev,b));
1186 if (le64_to_cpu(sb->data_size) < 10) {
1187 printk("md: data_size too small on %s\n",
1188 bdevname(rdev->bdev,b));
1191 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1192 if (sb->level != cpu_to_le32(1) &&
1193 sb->level != cpu_to_le32(4) &&
1194 sb->level != cpu_to_le32(5) &&
1195 sb->level != cpu_to_le32(6) &&
1196 sb->level != cpu_to_le32(10)) {
1198 "md: bitmaps not supported for this level.\n");
1203 rdev->preferred_minor = 0xffff;
1204 rdev->data_offset = le64_to_cpu(sb->data_offset);
1205 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1207 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1208 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1209 if (rdev->sb_size & bmask)
1210 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1213 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1216 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1219 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1225 struct mdp_superblock_1 *refsb =
1226 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1228 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1229 sb->level != refsb->level ||
1230 sb->layout != refsb->layout ||
1231 sb->chunksize != refsb->chunksize) {
1232 printk(KERN_WARNING "md: %s has strangely different"
1233 " superblock to %s\n",
1234 bdevname(rdev->bdev,b),
1235 bdevname(refdev->bdev,b2));
1238 ev1 = le64_to_cpu(sb->events);
1239 ev2 = le64_to_cpu(refsb->events);
1247 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1248 le64_to_cpu(sb->data_offset);
1250 rdev->sectors = rdev->sb_start;
1251 if (rdev->sectors < le64_to_cpu(sb->data_size))
1253 rdev->sectors = le64_to_cpu(sb->data_size);
1254 if (le32_to_cpu(sb->chunksize)) {
1255 int chunk_sects = le32_to_cpu(sb->chunksize);
1256 sector_t chunks = rdev->sectors;
1257 sector_div(chunks, chunk_sects);
1258 rdev->sectors = chunks * chunk_sects;
1261 if (le64_to_cpu(sb->size) > rdev->sectors)
1266 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1268 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1269 __u64 ev1 = le64_to_cpu(sb->events);
1271 rdev->raid_disk = -1;
1272 clear_bit(Faulty, &rdev->flags);
1273 clear_bit(In_sync, &rdev->flags);
1274 clear_bit(WriteMostly, &rdev->flags);
1275 clear_bit(BarriersNotsupp, &rdev->flags);
1277 if (mddev->raid_disks == 0) {
1278 mddev->major_version = 1;
1279 mddev->patch_version = 0;
1280 mddev->external = 0;
1281 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1282 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1283 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1284 mddev->level = le32_to_cpu(sb->level);
1285 mddev->clevel[0] = 0;
1286 mddev->layout = le32_to_cpu(sb->layout);
1287 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1288 mddev->dev_sectors = le64_to_cpu(sb->size);
1289 mddev->events = ev1;
1290 mddev->bitmap_offset = 0;
1291 mddev->default_bitmap_offset = 1024 >> 9;
1293 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1294 memcpy(mddev->uuid, sb->set_uuid, 16);
1296 mddev->max_disks = (4096-256)/2;
1298 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1299 mddev->bitmap_file == NULL )
1300 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1302 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1303 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1304 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1305 mddev->new_level = le32_to_cpu(sb->new_level);
1306 mddev->new_layout = le32_to_cpu(sb->new_layout);
1307 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1309 mddev->reshape_position = MaxSector;
1310 mddev->delta_disks = 0;
1311 mddev->new_level = mddev->level;
1312 mddev->new_layout = mddev->layout;
1313 mddev->new_chunk = mddev->chunk_sectors << 9;
1316 } else if (mddev->pers == NULL) {
1317 /* Insist of good event counter while assembling */
1319 if (ev1 < mddev->events)
1321 } else if (mddev->bitmap) {
1322 /* If adding to array with a bitmap, then we can accept an
1323 * older device, but not too old.
1325 if (ev1 < mddev->bitmap->events_cleared)
1328 if (ev1 < mddev->events)
1329 /* just a hot-add of a new device, leave raid_disk at -1 */
1332 if (mddev->level != LEVEL_MULTIPATH) {
1334 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1336 case 0xffff: /* spare */
1338 case 0xfffe: /* faulty */
1339 set_bit(Faulty, &rdev->flags);
1342 if ((le32_to_cpu(sb->feature_map) &
1343 MD_FEATURE_RECOVERY_OFFSET))
1344 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1346 set_bit(In_sync, &rdev->flags);
1347 rdev->raid_disk = role;
1350 if (sb->devflags & WriteMostly1)
1351 set_bit(WriteMostly, &rdev->flags);
1352 } else /* MULTIPATH are always insync */
1353 set_bit(In_sync, &rdev->flags);
1358 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1360 struct mdp_superblock_1 *sb;
1363 /* make rdev->sb match mddev and rdev data. */
1365 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1367 sb->feature_map = 0;
1369 sb->recovery_offset = cpu_to_le64(0);
1370 memset(sb->pad1, 0, sizeof(sb->pad1));
1371 memset(sb->pad2, 0, sizeof(sb->pad2));
1372 memset(sb->pad3, 0, sizeof(sb->pad3));
1374 sb->utime = cpu_to_le64((__u64)mddev->utime);
1375 sb->events = cpu_to_le64(mddev->events);
1377 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1379 sb->resync_offset = cpu_to_le64(0);
1381 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1383 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1384 sb->size = cpu_to_le64(mddev->dev_sectors);
1385 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1386 sb->level = cpu_to_le32(mddev->level);
1387 sb->layout = cpu_to_le32(mddev->layout);
1389 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1390 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1391 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1394 if (rdev->raid_disk >= 0 &&
1395 !test_bit(In_sync, &rdev->flags)) {
1396 if (mddev->curr_resync_completed > rdev->recovery_offset)
1397 rdev->recovery_offset = mddev->curr_resync_completed;
1398 if (rdev->recovery_offset > 0) {
1400 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1401 sb->recovery_offset =
1402 cpu_to_le64(rdev->recovery_offset);
1406 if (mddev->reshape_position != MaxSector) {
1407 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1408 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1409 sb->new_layout = cpu_to_le32(mddev->new_layout);
1410 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1411 sb->new_level = cpu_to_le32(mddev->new_level);
1412 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1416 list_for_each_entry(rdev2, &mddev->disks, same_set)
1417 if (rdev2->desc_nr+1 > max_dev)
1418 max_dev = rdev2->desc_nr+1;
1420 if (max_dev > le32_to_cpu(sb->max_dev))
1421 sb->max_dev = cpu_to_le32(max_dev);
1422 for (i=0; i<max_dev;i++)
1423 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1425 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1427 if (test_bit(Faulty, &rdev2->flags))
1428 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1429 else if (test_bit(In_sync, &rdev2->flags))
1430 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1431 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1432 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1434 sb->dev_roles[i] = cpu_to_le16(0xffff);
1437 sb->sb_csum = calc_sb_1_csum(sb);
1440 static unsigned long long
1441 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1443 struct mdp_superblock_1 *sb;
1444 sector_t max_sectors;
1445 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1446 return 0; /* component must fit device */
1447 if (rdev->sb_start < rdev->data_offset) {
1448 /* minor versions 1 and 2; superblock before data */
1449 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1450 max_sectors -= rdev->data_offset;
1451 if (!num_sectors || num_sectors > max_sectors)
1452 num_sectors = max_sectors;
1453 } else if (rdev->mddev->bitmap_offset) {
1454 /* minor version 0 with bitmap we can't move */
1457 /* minor version 0; superblock after data */
1459 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1460 sb_start &= ~(sector_t)(4*2 - 1);
1461 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1462 if (!num_sectors || num_sectors > max_sectors)
1463 num_sectors = max_sectors;
1464 rdev->sb_start = sb_start;
1466 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1467 sb->data_size = cpu_to_le64(num_sectors);
1468 sb->super_offset = rdev->sb_start;
1469 sb->sb_csum = calc_sb_1_csum(sb);
1470 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1472 md_super_wait(rdev->mddev);
1473 return num_sectors / 2; /* kB for sysfs */
1476 static struct super_type super_types[] = {
1479 .owner = THIS_MODULE,
1480 .load_super = super_90_load,
1481 .validate_super = super_90_validate,
1482 .sync_super = super_90_sync,
1483 .rdev_size_change = super_90_rdev_size_change,
1487 .owner = THIS_MODULE,
1488 .load_super = super_1_load,
1489 .validate_super = super_1_validate,
1490 .sync_super = super_1_sync,
1491 .rdev_size_change = super_1_rdev_size_change,
1495 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1497 mdk_rdev_t *rdev, *rdev2;
1500 rdev_for_each_rcu(rdev, mddev1)
1501 rdev_for_each_rcu(rdev2, mddev2)
1502 if (rdev->bdev->bd_contains ==
1503 rdev2->bdev->bd_contains) {
1511 static LIST_HEAD(pending_raid_disks);
1513 static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev)
1515 struct mdk_personality *pers = mddev->pers;
1516 struct gendisk *disk = mddev->gendisk;
1517 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1518 struct blk_integrity *bi_mddev = blk_get_integrity(disk);
1520 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1521 if (pers && pers->level >= 4 && pers->level <= 6)
1524 /* If rdev is integrity capable, register profile for mddev */
1525 if (!bi_mddev && bi_rdev) {
1526 if (blk_integrity_register(disk, bi_rdev))
1527 printk(KERN_ERR "%s: %s Could not register integrity!\n",
1528 __func__, disk->disk_name);
1530 printk(KERN_NOTICE "Enabling data integrity on %s\n",
1535 /* Check that mddev and rdev have matching profiles */
1536 if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) {
1537 printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__,
1538 disk->disk_name, rdev->bdev->bd_disk->disk_name);
1539 printk(KERN_NOTICE "Disabling data integrity on %s\n",
1541 blk_integrity_unregister(disk);
1545 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1547 char b[BDEVNAME_SIZE];
1557 /* prevent duplicates */
1558 if (find_rdev(mddev, rdev->bdev->bd_dev))
1561 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1562 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1563 rdev->sectors < mddev->dev_sectors)) {
1565 /* Cannot change size, so fail
1566 * If mddev->level <= 0, then we don't care
1567 * about aligning sizes (e.g. linear)
1569 if (mddev->level > 0)
1572 mddev->dev_sectors = rdev->sectors;
1575 /* Verify rdev->desc_nr is unique.
1576 * If it is -1, assign a free number, else
1577 * check number is not in use
1579 if (rdev->desc_nr < 0) {
1581 if (mddev->pers) choice = mddev->raid_disks;
1582 while (find_rdev_nr(mddev, choice))
1584 rdev->desc_nr = choice;
1586 if (find_rdev_nr(mddev, rdev->desc_nr))
1589 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1590 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1591 mdname(mddev), mddev->max_disks);
1594 bdevname(rdev->bdev,b);
1595 while ( (s=strchr(b, '/')) != NULL)
1598 rdev->mddev = mddev;
1599 printk(KERN_INFO "md: bind<%s>\n", b);
1601 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1604 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1605 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1606 kobject_del(&rdev->kobj);
1609 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1611 list_add_rcu(&rdev->same_set, &mddev->disks);
1612 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1614 /* May as well allow recovery to be retried once */
1615 mddev->recovery_disabled = 0;
1617 md_integrity_check(rdev, mddev);
1621 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1626 static void md_delayed_delete(struct work_struct *ws)
1628 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1629 kobject_del(&rdev->kobj);
1630 kobject_put(&rdev->kobj);
1633 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1635 char b[BDEVNAME_SIZE];
1640 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1641 list_del_rcu(&rdev->same_set);
1642 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1644 sysfs_remove_link(&rdev->kobj, "block");
1645 sysfs_put(rdev->sysfs_state);
1646 rdev->sysfs_state = NULL;
1647 /* We need to delay this, otherwise we can deadlock when
1648 * writing to 'remove' to "dev/state". We also need
1649 * to delay it due to rcu usage.
1652 INIT_WORK(&rdev->del_work, md_delayed_delete);
1653 kobject_get(&rdev->kobj);
1654 schedule_work(&rdev->del_work);
1658 * prevent the device from being mounted, repartitioned or
1659 * otherwise reused by a RAID array (or any other kernel
1660 * subsystem), by bd_claiming the device.
1662 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1665 struct block_device *bdev;
1666 char b[BDEVNAME_SIZE];
1668 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1670 printk(KERN_ERR "md: could not open %s.\n",
1671 __bdevname(dev, b));
1672 return PTR_ERR(bdev);
1674 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1676 printk(KERN_ERR "md: could not bd_claim %s.\n",
1678 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1682 set_bit(AllReserved, &rdev->flags);
1687 static void unlock_rdev(mdk_rdev_t *rdev)
1689 struct block_device *bdev = rdev->bdev;
1694 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1697 void md_autodetect_dev(dev_t dev);
1699 static void export_rdev(mdk_rdev_t * rdev)
1701 char b[BDEVNAME_SIZE];
1702 printk(KERN_INFO "md: export_rdev(%s)\n",
1703 bdevname(rdev->bdev,b));
1708 if (test_bit(AutoDetected, &rdev->flags))
1709 md_autodetect_dev(rdev->bdev->bd_dev);
1712 kobject_put(&rdev->kobj);
1715 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1717 unbind_rdev_from_array(rdev);
1721 static void export_array(mddev_t *mddev)
1723 mdk_rdev_t *rdev, *tmp;
1725 rdev_for_each(rdev, tmp, mddev) {
1730 kick_rdev_from_array(rdev);
1732 if (!list_empty(&mddev->disks))
1734 mddev->raid_disks = 0;
1735 mddev->major_version = 0;
1738 static void print_desc(mdp_disk_t *desc)
1740 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1741 desc->major,desc->minor,desc->raid_disk,desc->state);
1744 static void print_sb_90(mdp_super_t *sb)
1749 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1750 sb->major_version, sb->minor_version, sb->patch_version,
1751 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1753 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1754 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1755 sb->md_minor, sb->layout, sb->chunk_size);
1756 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1757 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1758 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1759 sb->failed_disks, sb->spare_disks,
1760 sb->sb_csum, (unsigned long)sb->events_lo);
1763 for (i = 0; i < MD_SB_DISKS; i++) {
1766 desc = sb->disks + i;
1767 if (desc->number || desc->major || desc->minor ||
1768 desc->raid_disk || (desc->state && (desc->state != 4))) {
1769 printk(" D %2d: ", i);
1773 printk(KERN_INFO "md: THIS: ");
1774 print_desc(&sb->this_disk);
1777 static void print_sb_1(struct mdp_superblock_1 *sb)
1781 uuid = sb->set_uuid;
1782 printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1783 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1784 KERN_INFO "md: Name: \"%s\" CT:%llu\n",
1785 le32_to_cpu(sb->major_version),
1786 le32_to_cpu(sb->feature_map),
1787 uuid[0], uuid[1], uuid[2], uuid[3],
1788 uuid[4], uuid[5], uuid[6], uuid[7],
1789 uuid[8], uuid[9], uuid[10], uuid[11],
1790 uuid[12], uuid[13], uuid[14], uuid[15],
1792 (unsigned long long)le64_to_cpu(sb->ctime)
1793 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1795 uuid = sb->device_uuid;
1796 printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1798 KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1799 ":%02x%02x%02x%02x%02x%02x\n"
1800 KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1801 KERN_INFO "md: (MaxDev:%u) \n",
1802 le32_to_cpu(sb->level),
1803 (unsigned long long)le64_to_cpu(sb->size),
1804 le32_to_cpu(sb->raid_disks),
1805 le32_to_cpu(sb->layout),
1806 le32_to_cpu(sb->chunksize),
1807 (unsigned long long)le64_to_cpu(sb->data_offset),
1808 (unsigned long long)le64_to_cpu(sb->data_size),
1809 (unsigned long long)le64_to_cpu(sb->super_offset),
1810 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1811 le32_to_cpu(sb->dev_number),
1812 uuid[0], uuid[1], uuid[2], uuid[3],
1813 uuid[4], uuid[5], uuid[6], uuid[7],
1814 uuid[8], uuid[9], uuid[10], uuid[11],
1815 uuid[12], uuid[13], uuid[14], uuid[15],
1817 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1818 (unsigned long long)le64_to_cpu(sb->events),
1819 (unsigned long long)le64_to_cpu(sb->resync_offset),
1820 le32_to_cpu(sb->sb_csum),
1821 le32_to_cpu(sb->max_dev)
1825 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1827 char b[BDEVNAME_SIZE];
1828 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1829 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1830 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1832 if (rdev->sb_loaded) {
1833 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1834 switch (major_version) {
1836 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1839 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1843 printk(KERN_INFO "md: no rdev superblock!\n");
1846 static void md_print_devices(void)
1848 struct list_head *tmp;
1851 char b[BDEVNAME_SIZE];
1854 printk("md: **********************************\n");
1855 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1856 printk("md: **********************************\n");
1857 for_each_mddev(mddev, tmp) {
1860 bitmap_print_sb(mddev->bitmap);
1862 printk("%s: ", mdname(mddev));
1863 list_for_each_entry(rdev, &mddev->disks, same_set)
1864 printk("<%s>", bdevname(rdev->bdev,b));
1867 list_for_each_entry(rdev, &mddev->disks, same_set)
1868 print_rdev(rdev, mddev->major_version);
1870 printk("md: **********************************\n");
1875 static void sync_sbs(mddev_t * mddev, int nospares)
1877 /* Update each superblock (in-memory image), but
1878 * if we are allowed to, skip spares which already
1879 * have the right event counter, or have one earlier
1880 * (which would mean they aren't being marked as dirty
1881 * with the rest of the array)
1885 list_for_each_entry(rdev, &mddev->disks, same_set) {
1886 if (rdev->sb_events == mddev->events ||
1888 rdev->raid_disk < 0 &&
1889 (rdev->sb_events&1)==0 &&
1890 rdev->sb_events+1 == mddev->events)) {
1891 /* Don't update this superblock */
1892 rdev->sb_loaded = 2;
1894 super_types[mddev->major_version].
1895 sync_super(mddev, rdev);
1896 rdev->sb_loaded = 1;
1901 static void md_update_sb(mddev_t * mddev, int force_change)
1907 if (mddev->external)
1910 spin_lock_irq(&mddev->write_lock);
1912 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1913 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1915 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1916 /* just a clean<-> dirty transition, possibly leave spares alone,
1917 * though if events isn't the right even/odd, we will have to do
1923 if (mddev->degraded)
1924 /* If the array is degraded, then skipping spares is both
1925 * dangerous and fairly pointless.
1926 * Dangerous because a device that was removed from the array
1927 * might have a event_count that still looks up-to-date,
1928 * so it can be re-added without a resync.
1929 * Pointless because if there are any spares to skip,
1930 * then a recovery will happen and soon that array won't
1931 * be degraded any more and the spare can go back to sleep then.
1935 sync_req = mddev->in_sync;
1936 mddev->utime = get_seconds();
1938 /* If this is just a dirty<->clean transition, and the array is clean
1939 * and 'events' is odd, we can roll back to the previous clean state */
1941 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1942 && (mddev->events & 1)
1943 && mddev->events != 1)
1946 /* otherwise we have to go forward and ... */
1948 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1949 /* .. if the array isn't clean, insist on an odd 'events' */
1950 if ((mddev->events&1)==0) {
1955 /* otherwise insist on an even 'events' (for clean states) */
1956 if ((mddev->events&1)) {
1963 if (!mddev->events) {
1965 * oops, this 64-bit counter should never wrap.
1966 * Either we are in around ~1 trillion A.C., assuming
1967 * 1 reboot per second, or we have a bug:
1974 * do not write anything to disk if using
1975 * nonpersistent superblocks
1977 if (!mddev->persistent) {
1978 if (!mddev->external)
1979 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1981 spin_unlock_irq(&mddev->write_lock);
1982 wake_up(&mddev->sb_wait);
1985 sync_sbs(mddev, nospares);
1986 spin_unlock_irq(&mddev->write_lock);
1989 "md: updating %s RAID superblock on device (in sync %d)\n",
1990 mdname(mddev),mddev->in_sync);
1992 bitmap_update_sb(mddev->bitmap);
1993 list_for_each_entry(rdev, &mddev->disks, same_set) {
1994 char b[BDEVNAME_SIZE];
1995 dprintk(KERN_INFO "md: ");
1996 if (rdev->sb_loaded != 1)
1997 continue; /* no noise on spare devices */
1998 if (test_bit(Faulty, &rdev->flags))
1999 dprintk("(skipping faulty ");
2001 dprintk("%s ", bdevname(rdev->bdev,b));
2002 if (!test_bit(Faulty, &rdev->flags)) {
2003 md_super_write(mddev,rdev,
2004 rdev->sb_start, rdev->sb_size,
2006 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2007 bdevname(rdev->bdev,b),
2008 (unsigned long long)rdev->sb_start);
2009 rdev->sb_events = mddev->events;
2013 if (mddev->level == LEVEL_MULTIPATH)
2014 /* only need to write one superblock... */
2017 md_super_wait(mddev);
2018 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2020 spin_lock_irq(&mddev->write_lock);
2021 if (mddev->in_sync != sync_req ||
2022 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2023 /* have to write it out again */
2024 spin_unlock_irq(&mddev->write_lock);
2027 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2028 spin_unlock_irq(&mddev->write_lock);
2029 wake_up(&mddev->sb_wait);
2030 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2031 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2035 /* words written to sysfs files may, or may not, be \n terminated.
2036 * We want to accept with case. For this we use cmd_match.
2038 static int cmd_match(const char *cmd, const char *str)
2040 /* See if cmd, written into a sysfs file, matches
2041 * str. They must either be the same, or cmd can
2042 * have a trailing newline
2044 while (*cmd && *str && *cmd == *str) {
2055 struct rdev_sysfs_entry {
2056 struct attribute attr;
2057 ssize_t (*show)(mdk_rdev_t *, char *);
2058 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2062 state_show(mdk_rdev_t *rdev, char *page)
2067 if (test_bit(Faulty, &rdev->flags)) {
2068 len+= sprintf(page+len, "%sfaulty",sep);
2071 if (test_bit(In_sync, &rdev->flags)) {
2072 len += sprintf(page+len, "%sin_sync",sep);
2075 if (test_bit(WriteMostly, &rdev->flags)) {
2076 len += sprintf(page+len, "%swrite_mostly",sep);
2079 if (test_bit(Blocked, &rdev->flags)) {
2080 len += sprintf(page+len, "%sblocked", sep);
2083 if (!test_bit(Faulty, &rdev->flags) &&
2084 !test_bit(In_sync, &rdev->flags)) {
2085 len += sprintf(page+len, "%sspare", sep);
2088 return len+sprintf(page+len, "\n");
2092 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2095 * faulty - simulates and error
2096 * remove - disconnects the device
2097 * writemostly - sets write_mostly
2098 * -writemostly - clears write_mostly
2099 * blocked - sets the Blocked flag
2100 * -blocked - clears the Blocked flag
2101 * insync - sets Insync providing device isn't active
2104 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2105 md_error(rdev->mddev, rdev);
2107 } else if (cmd_match(buf, "remove")) {
2108 if (rdev->raid_disk >= 0)
2111 mddev_t *mddev = rdev->mddev;
2112 kick_rdev_from_array(rdev);
2114 md_update_sb(mddev, 1);
2115 md_new_event(mddev);
2118 } else if (cmd_match(buf, "writemostly")) {
2119 set_bit(WriteMostly, &rdev->flags);
2121 } else if (cmd_match(buf, "-writemostly")) {
2122 clear_bit(WriteMostly, &rdev->flags);
2124 } else if (cmd_match(buf, "blocked")) {
2125 set_bit(Blocked, &rdev->flags);
2127 } else if (cmd_match(buf, "-blocked")) {
2128 clear_bit(Blocked, &rdev->flags);
2129 wake_up(&rdev->blocked_wait);
2130 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2131 md_wakeup_thread(rdev->mddev->thread);
2134 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2135 set_bit(In_sync, &rdev->flags);
2138 if (!err && rdev->sysfs_state)
2139 sysfs_notify_dirent(rdev->sysfs_state);
2140 return err ? err : len;
2142 static struct rdev_sysfs_entry rdev_state =
2143 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2146 errors_show(mdk_rdev_t *rdev, char *page)
2148 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2152 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2155 unsigned long n = simple_strtoul(buf, &e, 10);
2156 if (*buf && (*e == 0 || *e == '\n')) {
2157 atomic_set(&rdev->corrected_errors, n);
2162 static struct rdev_sysfs_entry rdev_errors =
2163 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2166 slot_show(mdk_rdev_t *rdev, char *page)
2168 if (rdev->raid_disk < 0)
2169 return sprintf(page, "none\n");
2171 return sprintf(page, "%d\n", rdev->raid_disk);
2175 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2180 int slot = simple_strtoul(buf, &e, 10);
2181 if (strncmp(buf, "none", 4)==0)
2183 else if (e==buf || (*e && *e!= '\n'))
2185 if (rdev->mddev->pers && slot == -1) {
2186 /* Setting 'slot' on an active array requires also
2187 * updating the 'rd%d' link, and communicating
2188 * with the personality with ->hot_*_disk.
2189 * For now we only support removing
2190 * failed/spare devices. This normally happens automatically,
2191 * but not when the metadata is externally managed.
2193 if (rdev->raid_disk == -1)
2195 /* personality does all needed checks */
2196 if (rdev->mddev->pers->hot_add_disk == NULL)
2198 err = rdev->mddev->pers->
2199 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2202 sprintf(nm, "rd%d", rdev->raid_disk);
2203 sysfs_remove_link(&rdev->mddev->kobj, nm);
2204 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2205 md_wakeup_thread(rdev->mddev->thread);
2206 } else if (rdev->mddev->pers) {
2208 /* Activating a spare .. or possibly reactivating
2209 * if we ever get bitmaps working here.
2212 if (rdev->raid_disk != -1)
2215 if (rdev->mddev->pers->hot_add_disk == NULL)
2218 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2219 if (rdev2->raid_disk == slot)
2222 rdev->raid_disk = slot;
2223 if (test_bit(In_sync, &rdev->flags))
2224 rdev->saved_raid_disk = slot;
2226 rdev->saved_raid_disk = -1;
2227 err = rdev->mddev->pers->
2228 hot_add_disk(rdev->mddev, rdev);
2230 rdev->raid_disk = -1;
2233 sysfs_notify_dirent(rdev->sysfs_state);
2234 sprintf(nm, "rd%d", rdev->raid_disk);
2235 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2237 "md: cannot register "
2239 nm, mdname(rdev->mddev));
2241 /* don't wakeup anyone, leave that to userspace. */
2243 if (slot >= rdev->mddev->raid_disks)
2245 rdev->raid_disk = slot;
2246 /* assume it is working */
2247 clear_bit(Faulty, &rdev->flags);
2248 clear_bit(WriteMostly, &rdev->flags);
2249 set_bit(In_sync, &rdev->flags);
2250 sysfs_notify_dirent(rdev->sysfs_state);
2256 static struct rdev_sysfs_entry rdev_slot =
2257 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2260 offset_show(mdk_rdev_t *rdev, char *page)
2262 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2266 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2269 unsigned long long offset = simple_strtoull(buf, &e, 10);
2270 if (e==buf || (*e && *e != '\n'))
2272 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2274 if (rdev->sectors && rdev->mddev->external)
2275 /* Must set offset before size, so overlap checks
2278 rdev->data_offset = offset;
2282 static struct rdev_sysfs_entry rdev_offset =
2283 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2286 rdev_size_show(mdk_rdev_t *rdev, char *page)
2288 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2291 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2293 /* check if two start/length pairs overlap */
2301 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2303 unsigned long long blocks;
2306 if (strict_strtoull(buf, 10, &blocks) < 0)
2309 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2310 return -EINVAL; /* sector conversion overflow */
2313 if (new != blocks * 2)
2314 return -EINVAL; /* unsigned long long to sector_t overflow */
2321 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2323 mddev_t *my_mddev = rdev->mddev;
2324 sector_t oldsectors = rdev->sectors;
2327 if (strict_blocks_to_sectors(buf, §ors) < 0)
2329 if (my_mddev->pers && rdev->raid_disk >= 0) {
2330 if (my_mddev->persistent) {
2331 sectors = super_types[my_mddev->major_version].
2332 rdev_size_change(rdev, sectors);
2335 } else if (!sectors)
2336 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2339 if (sectors < my_mddev->dev_sectors)
2340 return -EINVAL; /* component must fit device */
2342 rdev->sectors = sectors;
2343 if (sectors > oldsectors && my_mddev->external) {
2344 /* need to check that all other rdevs with the same ->bdev
2345 * do not overlap. We need to unlock the mddev to avoid
2346 * a deadlock. We have already changed rdev->sectors, and if
2347 * we have to change it back, we will have the lock again.
2351 struct list_head *tmp;
2353 mddev_unlock(my_mddev);
2354 for_each_mddev(mddev, tmp) {
2358 list_for_each_entry(rdev2, &mddev->disks, same_set)
2359 if (test_bit(AllReserved, &rdev2->flags) ||
2360 (rdev->bdev == rdev2->bdev &&
2362 overlaps(rdev->data_offset, rdev->sectors,
2368 mddev_unlock(mddev);
2374 mddev_lock(my_mddev);
2376 /* Someone else could have slipped in a size
2377 * change here, but doing so is just silly.
2378 * We put oldsectors back because we *know* it is
2379 * safe, and trust userspace not to race with
2382 rdev->sectors = oldsectors;
2389 static struct rdev_sysfs_entry rdev_size =
2390 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2392 static struct attribute *rdev_default_attrs[] = {
2401 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2403 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2404 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2405 mddev_t *mddev = rdev->mddev;
2411 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2413 if (rdev->mddev == NULL)
2416 rv = entry->show(rdev, page);
2417 mddev_unlock(mddev);
2423 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2424 const char *page, size_t length)
2426 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2427 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2429 mddev_t *mddev = rdev->mddev;
2433 if (!capable(CAP_SYS_ADMIN))
2435 rv = mddev ? mddev_lock(mddev): -EBUSY;
2437 if (rdev->mddev == NULL)
2440 rv = entry->store(rdev, page, length);
2441 mddev_unlock(mddev);
2446 static void rdev_free(struct kobject *ko)
2448 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2451 static struct sysfs_ops rdev_sysfs_ops = {
2452 .show = rdev_attr_show,
2453 .store = rdev_attr_store,
2455 static struct kobj_type rdev_ktype = {
2456 .release = rdev_free,
2457 .sysfs_ops = &rdev_sysfs_ops,
2458 .default_attrs = rdev_default_attrs,
2462 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2464 * mark the device faulty if:
2466 * - the device is nonexistent (zero size)
2467 * - the device has no valid superblock
2469 * a faulty rdev _never_ has rdev->sb set.
2471 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2473 char b[BDEVNAME_SIZE];
2478 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2480 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2481 return ERR_PTR(-ENOMEM);
2484 if ((err = alloc_disk_sb(rdev)))
2487 err = lock_rdev(rdev, newdev, super_format == -2);
2491 kobject_init(&rdev->kobj, &rdev_ktype);
2494 rdev->saved_raid_disk = -1;
2495 rdev->raid_disk = -1;
2497 rdev->data_offset = 0;
2498 rdev->sb_events = 0;
2499 atomic_set(&rdev->nr_pending, 0);
2500 atomic_set(&rdev->read_errors, 0);
2501 atomic_set(&rdev->corrected_errors, 0);
2503 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2506 "md: %s has zero or unknown size, marking faulty!\n",
2507 bdevname(rdev->bdev,b));
2512 if (super_format >= 0) {
2513 err = super_types[super_format].
2514 load_super(rdev, NULL, super_minor);
2515 if (err == -EINVAL) {
2517 "md: %s does not have a valid v%d.%d "
2518 "superblock, not importing!\n",
2519 bdevname(rdev->bdev,b),
2520 super_format, super_minor);
2525 "md: could not read %s's sb, not importing!\n",
2526 bdevname(rdev->bdev,b));
2531 INIT_LIST_HEAD(&rdev->same_set);
2532 init_waitqueue_head(&rdev->blocked_wait);
2537 if (rdev->sb_page) {
2543 return ERR_PTR(err);
2547 * Check a full RAID array for plausibility
2551 static void analyze_sbs(mddev_t * mddev)
2554 mdk_rdev_t *rdev, *freshest, *tmp;
2555 char b[BDEVNAME_SIZE];
2558 rdev_for_each(rdev, tmp, mddev)
2559 switch (super_types[mddev->major_version].
2560 load_super(rdev, freshest, mddev->minor_version)) {
2568 "md: fatal superblock inconsistency in %s"
2569 " -- removing from array\n",
2570 bdevname(rdev->bdev,b));
2571 kick_rdev_from_array(rdev);
2575 super_types[mddev->major_version].
2576 validate_super(mddev, freshest);
2579 rdev_for_each(rdev, tmp, mddev) {
2580 if (rdev->desc_nr >= mddev->max_disks ||
2581 i > mddev->max_disks) {
2583 "md: %s: %s: only %d devices permitted\n",
2584 mdname(mddev), bdevname(rdev->bdev, b),
2586 kick_rdev_from_array(rdev);
2589 if (rdev != freshest)
2590 if (super_types[mddev->major_version].
2591 validate_super(mddev, rdev)) {
2592 printk(KERN_WARNING "md: kicking non-fresh %s"
2594 bdevname(rdev->bdev,b));
2595 kick_rdev_from_array(rdev);
2598 if (mddev->level == LEVEL_MULTIPATH) {
2599 rdev->desc_nr = i++;
2600 rdev->raid_disk = rdev->desc_nr;
2601 set_bit(In_sync, &rdev->flags);
2602 } else if (rdev->raid_disk >= mddev->raid_disks) {
2603 rdev->raid_disk = -1;
2604 clear_bit(In_sync, &rdev->flags);
2610 if (mddev->recovery_cp != MaxSector &&
2612 printk(KERN_ERR "md: %s: raid array is not clean"
2613 " -- starting background reconstruction\n",
2618 static void md_safemode_timeout(unsigned long data);
2621 safe_delay_show(mddev_t *mddev, char *page)
2623 int msec = (mddev->safemode_delay*1000)/HZ;
2624 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2627 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2635 /* remove a period, and count digits after it */
2636 if (len >= sizeof(buf))
2638 strlcpy(buf, cbuf, sizeof(buf));
2639 for (i=0; i<len; i++) {
2641 if (isdigit(buf[i])) {
2646 } else if (buf[i] == '.') {
2651 if (strict_strtoul(buf, 10, &msec) < 0)
2653 msec = (msec * 1000) / scale;
2655 mddev->safemode_delay = 0;
2657 unsigned long old_delay = mddev->safemode_delay;
2658 mddev->safemode_delay = (msec*HZ)/1000;
2659 if (mddev->safemode_delay == 0)
2660 mddev->safemode_delay = 1;
2661 if (mddev->safemode_delay < old_delay)
2662 md_safemode_timeout((unsigned long)mddev);
2666 static struct md_sysfs_entry md_safe_delay =
2667 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2670 level_show(mddev_t *mddev, char *page)
2672 struct mdk_personality *p = mddev->pers;
2674 return sprintf(page, "%s\n", p->name);
2675 else if (mddev->clevel[0])
2676 return sprintf(page, "%s\n", mddev->clevel);
2677 else if (mddev->level != LEVEL_NONE)
2678 return sprintf(page, "%d\n", mddev->level);
2684 level_store(mddev_t *mddev, const char *buf, size_t len)
2688 struct mdk_personality *pers;
2691 if (mddev->pers == NULL) {
2694 if (len >= sizeof(mddev->clevel))
2696 strncpy(mddev->clevel, buf, len);
2697 if (mddev->clevel[len-1] == '\n')
2699 mddev->clevel[len] = 0;
2700 mddev->level = LEVEL_NONE;
2704 /* request to change the personality. Need to ensure:
2705 * - array is not engaged in resync/recovery/reshape
2706 * - old personality can be suspended
2707 * - new personality will access other array.
2710 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2713 if (!mddev->pers->quiesce) {
2714 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2715 mdname(mddev), mddev->pers->name);
2719 /* Now find the new personality */
2720 if (len == 0 || len >= sizeof(level))
2722 strncpy(level, buf, len);
2723 if (level[len-1] == '\n')
2727 request_module("md-%s", level);
2728 spin_lock(&pers_lock);
2729 pers = find_pers(LEVEL_NONE, level);
2730 if (!pers || !try_module_get(pers->owner)) {
2731 spin_unlock(&pers_lock);
2732 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2735 spin_unlock(&pers_lock);
2737 if (pers == mddev->pers) {
2738 /* Nothing to do! */
2739 module_put(pers->owner);
2742 if (!pers->takeover) {
2743 module_put(pers->owner);
2744 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2745 mdname(mddev), level);
2749 /* ->takeover must set new_* and/or delta_disks
2750 * if it succeeds, and may set them when it fails.
2752 priv = pers->takeover(mddev);
2754 mddev->new_level = mddev->level;
2755 mddev->new_layout = mddev->layout;
2756 mddev->new_chunk = mddev->chunk_sectors << 9;
2757 mddev->raid_disks -= mddev->delta_disks;
2758 mddev->delta_disks = 0;
2759 module_put(pers->owner);
2760 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2761 mdname(mddev), level);
2762 return PTR_ERR(priv);
2765 /* Looks like we have a winner */
2766 mddev_suspend(mddev);
2767 mddev->pers->stop(mddev);
2768 module_put(mddev->pers->owner);
2770 mddev->private = priv;
2771 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2772 mddev->level = mddev->new_level;
2773 mddev->layout = mddev->new_layout;
2774 mddev->chunk_sectors = mddev->new_chunk >> 9;
2775 mddev->delta_disks = 0;
2777 mddev_resume(mddev);
2778 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2779 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2780 md_wakeup_thread(mddev->thread);
2784 static struct md_sysfs_entry md_level =
2785 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2789 layout_show(mddev_t *mddev, char *page)
2791 /* just a number, not meaningful for all levels */
2792 if (mddev->reshape_position != MaxSector &&
2793 mddev->layout != mddev->new_layout)
2794 return sprintf(page, "%d (%d)\n",
2795 mddev->new_layout, mddev->layout);
2796 return sprintf(page, "%d\n", mddev->layout);
2800 layout_store(mddev_t *mddev, const char *buf, size_t len)
2803 unsigned long n = simple_strtoul(buf, &e, 10);
2805 if (!*buf || (*e && *e != '\n'))
2810 if (mddev->pers->reconfig == NULL)
2812 err = mddev->pers->reconfig(mddev, n, -1);
2816 mddev->new_layout = n;
2817 if (mddev->reshape_position == MaxSector)
2822 static struct md_sysfs_entry md_layout =
2823 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2827 raid_disks_show(mddev_t *mddev, char *page)
2829 if (mddev->raid_disks == 0)
2831 if (mddev->reshape_position != MaxSector &&
2832 mddev->delta_disks != 0)
2833 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2834 mddev->raid_disks - mddev->delta_disks);
2835 return sprintf(page, "%d\n", mddev->raid_disks);
2838 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2841 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2845 unsigned long n = simple_strtoul(buf, &e, 10);
2847 if (!*buf || (*e && *e != '\n'))
2851 rv = update_raid_disks(mddev, n);
2852 else if (mddev->reshape_position != MaxSector) {
2853 int olddisks = mddev->raid_disks - mddev->delta_disks;
2854 mddev->delta_disks = n - olddisks;
2855 mddev->raid_disks = n;
2857 mddev->raid_disks = n;
2858 return rv ? rv : len;
2860 static struct md_sysfs_entry md_raid_disks =
2861 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2864 chunk_size_show(mddev_t *mddev, char *page)
2866 if (mddev->reshape_position != MaxSector &&
2867 mddev->chunk_sectors << 9 != mddev->new_chunk)
2868 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2869 mddev->chunk_sectors << 9);
2870 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
2874 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2877 unsigned long n = simple_strtoul(buf, &e, 10);
2879 if (!*buf || (*e && *e != '\n'))
2884 if (mddev->pers->reconfig == NULL)
2886 err = mddev->pers->reconfig(mddev, -1, n);
2890 mddev->new_chunk = n;
2891 if (mddev->reshape_position == MaxSector)
2892 mddev->chunk_sectors = n >> 9;
2896 static struct md_sysfs_entry md_chunk_size =
2897 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2900 resync_start_show(mddev_t *mddev, char *page)
2902 if (mddev->recovery_cp == MaxSector)
2903 return sprintf(page, "none\n");
2904 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2908 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2911 unsigned long long n = simple_strtoull(buf, &e, 10);
2915 if (!*buf || (*e && *e != '\n'))
2918 mddev->recovery_cp = n;
2921 static struct md_sysfs_entry md_resync_start =
2922 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2925 * The array state can be:
2928 * No devices, no size, no level
2929 * Equivalent to STOP_ARRAY ioctl
2931 * May have some settings, but array is not active
2932 * all IO results in error
2933 * When written, doesn't tear down array, but just stops it
2934 * suspended (not supported yet)
2935 * All IO requests will block. The array can be reconfigured.
2936 * Writing this, if accepted, will block until array is quiescent
2938 * no resync can happen. no superblocks get written.
2939 * write requests fail
2941 * like readonly, but behaves like 'clean' on a write request.
2943 * clean - no pending writes, but otherwise active.
2944 * When written to inactive array, starts without resync
2945 * If a write request arrives then
2946 * if metadata is known, mark 'dirty' and switch to 'active'.
2947 * if not known, block and switch to write-pending
2948 * If written to an active array that has pending writes, then fails.
2950 * fully active: IO and resync can be happening.
2951 * When written to inactive array, starts with resync
2954 * clean, but writes are blocked waiting for 'active' to be written.
2957 * like active, but no writes have been seen for a while (100msec).
2960 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2961 write_pending, active_idle, bad_word};
2962 static char *array_states[] = {
2963 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2964 "write-pending", "active-idle", NULL };
2966 static int match_word(const char *word, char **list)
2969 for (n=0; list[n]; n++)
2970 if (cmd_match(word, list[n]))
2976 array_state_show(mddev_t *mddev, char *page)
2978 enum array_state st = inactive;
2991 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2993 else if (mddev->safemode)
2999 if (list_empty(&mddev->disks) &&
3000 mddev->raid_disks == 0 &&
3001 mddev->dev_sectors == 0)
3006 return sprintf(page, "%s\n", array_states[st]);
3009 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3010 static int do_md_run(mddev_t * mddev);
3011 static int restart_array(mddev_t *mddev);
3014 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3017 enum array_state st = match_word(buf, array_states);
3022 /* stopping an active array */
3023 if (atomic_read(&mddev->openers) > 0)
3025 err = do_md_stop(mddev, 0, 0);
3028 /* stopping an active array */
3030 if (atomic_read(&mddev->openers) > 0)
3032 err = do_md_stop(mddev, 2, 0);
3034 err = 0; /* already inactive */
3037 break; /* not supported yet */
3040 err = do_md_stop(mddev, 1, 0);
3043 set_disk_ro(mddev->gendisk, 1);
3044 err = do_md_run(mddev);
3050 err = do_md_stop(mddev, 1, 0);
3051 else if (mddev->ro == 1)
3052 err = restart_array(mddev);
3055 set_disk_ro(mddev->gendisk, 0);
3059 err = do_md_run(mddev);
3064 restart_array(mddev);
3065 spin_lock_irq(&mddev->write_lock);
3066 if (atomic_read(&mddev->writes_pending) == 0) {
3067 if (mddev->in_sync == 0) {
3069 if (mddev->safemode == 1)
3070 mddev->safemode = 0;
3071 if (mddev->persistent)
3072 set_bit(MD_CHANGE_CLEAN,
3078 spin_unlock_irq(&mddev->write_lock);
3084 restart_array(mddev);
3085 if (mddev->external)
3086 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3087 wake_up(&mddev->sb_wait);
3091 set_disk_ro(mddev->gendisk, 0);
3092 err = do_md_run(mddev);
3097 /* these cannot be set */
3103 sysfs_notify_dirent(mddev->sysfs_state);
3107 static struct md_sysfs_entry md_array_state =
3108 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3111 null_show(mddev_t *mddev, char *page)
3117 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3119 /* buf must be %d:%d\n? giving major and minor numbers */
3120 /* The new device is added to the array.
3121 * If the array has a persistent superblock, we read the
3122 * superblock to initialise info and check validity.
3123 * Otherwise, only checking done is that in bind_rdev_to_array,
3124 * which mainly checks size.
3127 int major = simple_strtoul(buf, &e, 10);
3133 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3135 minor = simple_strtoul(e+1, &e, 10);
3136 if (*e && *e != '\n')
3138 dev = MKDEV(major, minor);
3139 if (major != MAJOR(dev) ||
3140 minor != MINOR(dev))
3144 if (mddev->persistent) {
3145 rdev = md_import_device(dev, mddev->major_version,
3146 mddev->minor_version);
3147 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3148 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3149 mdk_rdev_t, same_set);
3150 err = super_types[mddev->major_version]
3151 .load_super(rdev, rdev0, mddev->minor_version);
3155 } else if (mddev->external)
3156 rdev = md_import_device(dev, -2, -1);
3158 rdev = md_import_device(dev, -1, -1);
3161 return PTR_ERR(rdev);
3162 err = bind_rdev_to_array(rdev, mddev);
3166 return err ? err : len;
3169 static struct md_sysfs_entry md_new_device =
3170 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3173 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3176 unsigned long chunk, end_chunk;
3180 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3182 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3183 if (buf == end) break;
3184 if (*end == '-') { /* range */
3186 end_chunk = simple_strtoul(buf, &end, 0);
3187 if (buf == end) break;
3189 if (*end && !isspace(*end)) break;
3190 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3192 while (isspace(*buf)) buf++;
3194 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3199 static struct md_sysfs_entry md_bitmap =
3200 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3203 size_show(mddev_t *mddev, char *page)
3205 return sprintf(page, "%llu\n",
3206 (unsigned long long)mddev->dev_sectors / 2);
3209 static int update_size(mddev_t *mddev, sector_t num_sectors);
3212 size_store(mddev_t *mddev, const char *buf, size_t len)
3214 /* If array is inactive, we can reduce the component size, but
3215 * not increase it (except from 0).
3216 * If array is active, we can try an on-line resize
3219 int err = strict_blocks_to_sectors(buf, §ors);
3224 err = update_size(mddev, sectors);
3225 md_update_sb(mddev, 1);
3227 if (mddev->dev_sectors == 0 ||
3228 mddev->dev_sectors > sectors)
3229 mddev->dev_sectors = sectors;
3233 return err ? err : len;
3236 static struct md_sysfs_entry md_size =
3237 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3242 * 'none' for arrays with no metadata (good luck...)
3243 * 'external' for arrays with externally managed metadata,
3244 * or N.M for internally known formats
3247 metadata_show(mddev_t *mddev, char *page)
3249 if (mddev->persistent)
3250 return sprintf(page, "%d.%d\n",
3251 mddev->major_version, mddev->minor_version);
3252 else if (mddev->external)
3253 return sprintf(page, "external:%s\n", mddev->metadata_type);
3255 return sprintf(page, "none\n");
3259 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3263 /* Changing the details of 'external' metadata is
3264 * always permitted. Otherwise there must be
3265 * no devices attached to the array.
3267 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3269 else if (!list_empty(&mddev->disks))
3272 if (cmd_match(buf, "none")) {
3273 mddev->persistent = 0;
3274 mddev->external = 0;
3275 mddev->major_version = 0;
3276 mddev->minor_version = 90;
3279 if (strncmp(buf, "external:", 9) == 0) {
3280 size_t namelen = len-9;
3281 if (namelen >= sizeof(mddev->metadata_type))
3282 namelen = sizeof(mddev->metadata_type)-1;
3283 strncpy(mddev->metadata_type, buf+9, namelen);
3284 mddev->metadata_type[namelen] = 0;
3285 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3286 mddev->metadata_type[--namelen] = 0;
3287 mddev->persistent = 0;
3288 mddev->external = 1;
3289 mddev->major_version = 0;
3290 mddev->minor_version = 90;
3293 major = simple_strtoul(buf, &e, 10);
3294 if (e==buf || *e != '.')
3297 minor = simple_strtoul(buf, &e, 10);
3298 if (e==buf || (*e && *e != '\n') )
3300 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3302 mddev->major_version = major;
3303 mddev->minor_version = minor;
3304 mddev->persistent = 1;
3305 mddev->external = 0;
3309 static struct md_sysfs_entry md_metadata =
3310 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3313 action_show(mddev_t *mddev, char *page)
3315 char *type = "idle";
3316 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3318 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3319 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3320 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3322 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3323 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3325 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3329 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3332 return sprintf(page, "%s\n", type);
3336 action_store(mddev_t *mddev, const char *page, size_t len)
3338 if (!mddev->pers || !mddev->pers->sync_request)
3341 if (cmd_match(page, "frozen"))
3342 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3344 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3346 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3347 if (mddev->sync_thread) {
3348 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3349 md_unregister_thread(mddev->sync_thread);
3350 mddev->sync_thread = NULL;
3351 mddev->recovery = 0;
3353 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3354 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3356 else if (cmd_match(page, "resync"))
3357 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3358 else if (cmd_match(page, "recover")) {
3359 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3360 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3361 } else if (cmd_match(page, "reshape")) {
3363 if (mddev->pers->start_reshape == NULL)
3365 err = mddev->pers->start_reshape(mddev);
3368 sysfs_notify(&mddev->kobj, NULL, "degraded");
3370 if (cmd_match(page, "check"))
3371 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3372 else if (!cmd_match(page, "repair"))
3374 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3375 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3377 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3378 md_wakeup_thread(mddev->thread);
3379 sysfs_notify_dirent(mddev->sysfs_action);
3384 mismatch_cnt_show(mddev_t *mddev, char *page)
3386 return sprintf(page, "%llu\n",
3387 (unsigned long long) mddev->resync_mismatches);
3390 static struct md_sysfs_entry md_scan_mode =
3391 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3394 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3397 sync_min_show(mddev_t *mddev, char *page)
3399 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3400 mddev->sync_speed_min ? "local": "system");
3404 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3408 if (strncmp(buf, "system", 6)==0) {
3409 mddev->sync_speed_min = 0;
3412 min = simple_strtoul(buf, &e, 10);
3413 if (buf == e || (*e && *e != '\n') || min <= 0)
3415 mddev->sync_speed_min = min;
3419 static struct md_sysfs_entry md_sync_min =
3420 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3423 sync_max_show(mddev_t *mddev, char *page)
3425 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3426 mddev->sync_speed_max ? "local": "system");
3430 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3434 if (strncmp(buf, "system", 6)==0) {
3435 mddev->sync_speed_max = 0;
3438 max = simple_strtoul(buf, &e, 10);
3439 if (buf == e || (*e && *e != '\n') || max <= 0)
3441 mddev->sync_speed_max = max;
3445 static struct md_sysfs_entry md_sync_max =
3446 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3449 degraded_show(mddev_t *mddev, char *page)
3451 return sprintf(page, "%d\n", mddev->degraded);
3453 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3456 sync_force_parallel_show(mddev_t *mddev, char *page)
3458 return sprintf(page, "%d\n", mddev->parallel_resync);
3462 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3466 if (strict_strtol(buf, 10, &n))
3469 if (n != 0 && n != 1)
3472 mddev->parallel_resync = n;
3474 if (mddev->sync_thread)
3475 wake_up(&resync_wait);
3480 /* force parallel resync, even with shared block devices */
3481 static struct md_sysfs_entry md_sync_force_parallel =
3482 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3483 sync_force_parallel_show, sync_force_parallel_store);
3486 sync_speed_show(mddev_t *mddev, char *page)
3488 unsigned long resync, dt, db;
3489 if (mddev->curr_resync == 0)
3490 return sprintf(page, "none\n");
3491 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3492 dt = (jiffies - mddev->resync_mark) / HZ;
3494 db = resync - mddev->resync_mark_cnt;
3495 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3498 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3501 sync_completed_show(mddev_t *mddev, char *page)
3503 unsigned long max_sectors, resync;
3505 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3506 return sprintf(page, "none\n");
3508 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3509 max_sectors = mddev->resync_max_sectors;
3511 max_sectors = mddev->dev_sectors;
3513 resync = mddev->curr_resync_completed;
3514 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3517 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3520 min_sync_show(mddev_t *mddev, char *page)
3522 return sprintf(page, "%llu\n",
3523 (unsigned long long)mddev->resync_min);
3526 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3528 unsigned long long min;
3529 if (strict_strtoull(buf, 10, &min))
3531 if (min > mddev->resync_max)
3533 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3536 /* Must be a multiple of chunk_size */
3537 if (mddev->chunk_sectors) {
3538 sector_t temp = min;
3539 if (sector_div(temp, mddev->chunk_sectors))
3542 mddev->resync_min = min;
3547 static struct md_sysfs_entry md_min_sync =
3548 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3551 max_sync_show(mddev_t *mddev, char *page)
3553 if (mddev->resync_max == MaxSector)
3554 return sprintf(page, "max\n");
3556 return sprintf(page, "%llu\n",
3557 (unsigned long long)mddev->resync_max);
3560 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3562 if (strncmp(buf, "max", 3) == 0)
3563 mddev->resync_max = MaxSector;
3565 unsigned long long max;
3566 if (strict_strtoull(buf, 10, &max))
3568 if (max < mddev->resync_min)
3570 if (max < mddev->resync_max &&
3571 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3574 /* Must be a multiple of chunk_size */
3575 if (mddev->chunk_sectors) {
3576 sector_t temp = max;
3577 if (sector_div(temp, mddev->chunk_sectors))
3580 mddev->resync_max = max;
3582 wake_up(&mddev->recovery_wait);
3586 static struct md_sysfs_entry md_max_sync =
3587 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3590 suspend_lo_show(mddev_t *mddev, char *page)
3592 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3596 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3599 unsigned long long new = simple_strtoull(buf, &e, 10);
3601 if (mddev->pers->quiesce == NULL)
3603 if (buf == e || (*e && *e != '\n'))
3605 if (new >= mddev->suspend_hi ||
3606 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3607 mddev->suspend_lo = new;
3608 mddev->pers->quiesce(mddev, 2);
3613 static struct md_sysfs_entry md_suspend_lo =
3614 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3618 suspend_hi_show(mddev_t *mddev, char *page)
3620 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3624 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3627 unsigned long long new = simple_strtoull(buf, &e, 10);
3629 if (mddev->pers->quiesce == NULL)
3631 if (buf == e || (*e && *e != '\n'))
3633 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3634 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3635 mddev->suspend_hi = new;
3636 mddev->pers->quiesce(mddev, 1);
3637 mddev->pers->quiesce(mddev, 0);
3642 static struct md_sysfs_entry md_suspend_hi =
3643 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3646 reshape_position_show(mddev_t *mddev, char *page)
3648 if (mddev->reshape_position != MaxSector)
3649 return sprintf(page, "%llu\n",
3650 (unsigned long long)mddev->reshape_position);
3651 strcpy(page, "none\n");
3656 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3659 unsigned long long new = simple_strtoull(buf, &e, 10);
3662 if (buf == e || (*e && *e != '\n'))
3664 mddev->reshape_position = new;
3665 mddev->delta_disks = 0;
3666 mddev->new_level = mddev->level;
3667 mddev->new_layout = mddev->layout;
3668 mddev->new_chunk = mddev->chunk_sectors << 9;
3672 static struct md_sysfs_entry md_reshape_position =
3673 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3674 reshape_position_store);
3677 array_size_show(mddev_t *mddev, char *page)
3679 if (mddev->external_size)
3680 return sprintf(page, "%llu\n",
3681 (unsigned long long)mddev->array_sectors/2);
3683 return sprintf(page, "default\n");
3687 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3691 if (strncmp(buf, "default", 7) == 0) {
3693 sectors = mddev->pers->size(mddev, 0, 0);
3695 sectors = mddev->array_sectors;
3697 mddev->external_size = 0;
3699 if (strict_blocks_to_sectors(buf, §ors) < 0)
3701 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3704 mddev->external_size = 1;
3707 mddev->array_sectors = sectors;
3708 set_capacity(mddev->gendisk, mddev->array_sectors);
3710 struct block_device *bdev = bdget_disk(mddev->gendisk, 0);
3713 mutex_lock(&bdev->bd_inode->i_mutex);
3714 i_size_write(bdev->bd_inode,
3715 (loff_t)mddev->array_sectors << 9);
3716 mutex_unlock(&bdev->bd_inode->i_mutex);
3724 static struct md_sysfs_entry md_array_size =
3725 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3728 static struct attribute *md_default_attrs[] = {
3731 &md_raid_disks.attr,
3732 &md_chunk_size.attr,
3734 &md_resync_start.attr,
3736 &md_new_device.attr,
3737 &md_safe_delay.attr,
3738 &md_array_state.attr,
3739 &md_reshape_position.attr,
3740 &md_array_size.attr,
3744 static struct attribute *md_redundancy_attrs[] = {
3746 &md_mismatches.attr,
3749 &md_sync_speed.attr,
3750 &md_sync_force_parallel.attr,
3751 &md_sync_completed.attr,
3754 &md_suspend_lo.attr,
3755 &md_suspend_hi.attr,
3760 static struct attribute_group md_redundancy_group = {
3762 .attrs = md_redundancy_attrs,
3767 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3769 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3770 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3775 rv = mddev_lock(mddev);
3777 rv = entry->show(mddev, page);
3778 mddev_unlock(mddev);
3784 md_attr_store(struct kobject *kobj, struct attribute *attr,
3785 const char *page, size_t length)
3787 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3788 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3793 if (!capable(CAP_SYS_ADMIN))
3795 rv = mddev_lock(mddev);
3796 if (mddev->hold_active == UNTIL_IOCTL)
3797 mddev->hold_active = 0;
3799 rv = entry->store(mddev, page, length);
3800 mddev_unlock(mddev);
3805 static void md_free(struct kobject *ko)
3807 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3809 if (mddev->sysfs_state)
3810 sysfs_put(mddev->sysfs_state);
3812 if (mddev->gendisk) {
3813 del_gendisk(mddev->gendisk);
3814 put_disk(mddev->gendisk);
3817 blk_cleanup_queue(mddev->queue);
3822 static struct sysfs_ops md_sysfs_ops = {
3823 .show = md_attr_show,
3824 .store = md_attr_store,
3826 static struct kobj_type md_ktype = {
3828 .sysfs_ops = &md_sysfs_ops,
3829 .default_attrs = md_default_attrs,
3834 static void mddev_delayed_delete(struct work_struct *ws)
3836 mddev_t *mddev = container_of(ws, mddev_t, del_work);
3838 if (mddev->private == &md_redundancy_group) {
3839 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3840 if (mddev->sysfs_action)
3841 sysfs_put(mddev->sysfs_action);
3842 mddev->sysfs_action = NULL;
3843 mddev->private = NULL;
3845 kobject_del(&mddev->kobj);
3846 kobject_put(&mddev->kobj);
3849 static int md_alloc(dev_t dev, char *name)
3851 static DEFINE_MUTEX(disks_mutex);
3852 mddev_t *mddev = mddev_find(dev);
3853 struct gendisk *disk;
3862 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3863 shift = partitioned ? MdpMinorShift : 0;
3864 unit = MINOR(mddev->unit) >> shift;
3866 /* wait for any previous instance if this device
3867 * to be completed removed (mddev_delayed_delete).
3869 flush_scheduled_work();
3871 mutex_lock(&disks_mutex);
3872 if (mddev->gendisk) {
3873 mutex_unlock(&disks_mutex);
3879 /* Need to ensure that 'name' is not a duplicate.
3882 spin_lock(&all_mddevs_lock);
3884 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3885 if (mddev2->gendisk &&
3886 strcmp(mddev2->gendisk->disk_name, name) == 0) {
3887 spin_unlock(&all_mddevs_lock);
3890 spin_unlock(&all_mddevs_lock);
3893 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3894 if (!mddev->queue) {
3895 mutex_unlock(&disks_mutex);
3899 mddev->queue->queuedata = mddev;
3901 /* Can be unlocked because the queue is new: no concurrency */
3902 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3904 blk_queue_make_request(mddev->queue, md_make_request);
3906 disk = alloc_disk(1 << shift);
3908 mutex_unlock(&disks_mutex);
3909 blk_cleanup_queue(mddev->queue);
3910 mddev->queue = NULL;
3914 disk->major = MAJOR(mddev->unit);
3915 disk->first_minor = unit << shift;
3917 strcpy(disk->disk_name, name);
3918 else if (partitioned)
3919 sprintf(disk->disk_name, "md_d%d", unit);
3921 sprintf(disk->disk_name, "md%d", unit);
3922 disk->fops = &md_fops;
3923 disk->private_data = mddev;
3924 disk->queue = mddev->queue;
3925 /* Allow extended partitions. This makes the
3926 * 'mdp' device redundant, but we can't really
3929 disk->flags |= GENHD_FL_EXT_DEVT;
3931 mddev->gendisk = disk;
3932 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3933 &disk_to_dev(disk)->kobj, "%s", "md");
3934 mutex_unlock(&disks_mutex);
3936 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3939 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3940 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3946 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3948 md_alloc(dev, NULL);
3952 static int add_named_array(const char *val, struct kernel_param *kp)
3954 /* val must be "md_*" where * is not all digits.
3955 * We allocate an array with a large free minor number, and
3956 * set the name to val. val must not already be an active name.
3958 int len = strlen(val);
3959 char buf[DISK_NAME_LEN];
3961 while (len && val[len-1] == '\n')
3963 if (len >= DISK_NAME_LEN)
3965 strlcpy(buf, val, len+1);
3966 if (strncmp(buf, "md_", 3) != 0)
3968 return md_alloc(0, buf);
3971 static void md_safemode_timeout(unsigned long data)
3973 mddev_t *mddev = (mddev_t *) data;
3975 if (!atomic_read(&mddev->writes_pending)) {
3976 mddev->safemode = 1;
3977 if (mddev->external)
3978 sysfs_notify_dirent(mddev->sysfs_state);
3980 md_wakeup_thread(mddev->thread);
3983 static int start_dirty_degraded;
3985 static int do_md_run(mddev_t * mddev)
3990 struct gendisk *disk;
3991 struct mdk_personality *pers;
3992 char b[BDEVNAME_SIZE];
3994 if (list_empty(&mddev->disks))
3995 /* cannot run an array with no devices.. */
4002 * Analyze all RAID superblock(s)
4004 if (!mddev->raid_disks) {
4005 if (!mddev->persistent)
4010 chunk_size = mddev->chunk_sectors << 9;
4013 if (chunk_size > MAX_CHUNK_SIZE) {
4014 printk(KERN_ERR "too big chunk_size: %d > %d\n",
4015 chunk_size, MAX_CHUNK_SIZE);
4018 /* devices must have minimum size of one chunk */
4019 list_for_each_entry(rdev, &mddev->disks, same_set) {
4020 if (test_bit(Faulty, &rdev->flags))
4022 if (rdev->sectors < chunk_size / 512) {
4024 "md: Dev %s smaller than chunk_size:"
4026 bdevname(rdev->bdev,b),
4027 (unsigned long long)rdev->sectors,
4034 if (mddev->level != LEVEL_NONE)
4035 request_module("md-level-%d", mddev->level);
4036 else if (mddev->clevel[0])
4037 request_module("md-%s", mddev->clevel);
4040 * Drop all container device buffers, from now on
4041 * the only valid external interface is through the md
4044 list_for_each_entry(rdev, &mddev->disks, same_set) {
4045 if (test_bit(Faulty, &rdev->flags))
4047 sync_blockdev(rdev->bdev);
4048 invalidate_bdev(rdev->bdev);
4050 /* perform some consistency tests on the device.
4051 * We don't want the data to overlap the metadata,
4052 * Internal Bitmap issues have been handled elsewhere.
4054 if (rdev->data_offset < rdev->sb_start) {
4055 if (mddev->dev_sectors &&
4056 rdev->data_offset + mddev->dev_sectors
4058 printk("md: %s: data overlaps metadata\n",
4063 if (rdev->sb_start + rdev->sb_size/512
4064 > rdev->data_offset) {
4065 printk("md: %s: metadata overlaps data\n",
4070 sysfs_notify_dirent(rdev->sysfs_state);
4073 md_probe(mddev->unit, NULL, NULL);
4074 disk = mddev->gendisk;
4078 spin_lock(&pers_lock);
4079 pers = find_pers(mddev->level, mddev->clevel);
4080 if (!pers || !try_module_get(pers->owner)) {
4081 spin_unlock(&pers_lock);
4082 if (mddev->level != LEVEL_NONE)
4083 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4086 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4091 spin_unlock(&pers_lock);
4092 if (mddev->level != pers->level) {
4093 mddev->level = pers->level;
4094 mddev->new_level = pers->level;
4096 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4098 if (pers->level >= 4 && pers->level <= 6)
4099 /* Cannot support integrity (yet) */
4100 blk_integrity_unregister(mddev->gendisk);
4102 if (mddev->reshape_position != MaxSector &&
4103 pers->start_reshape == NULL) {
4104 /* This personality cannot handle reshaping... */
4106 module_put(pers->owner);
4110 if (pers->sync_request) {
4111 /* Warn if this is a potentially silly
4114 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4118 list_for_each_entry(rdev, &mddev->disks, same_set)
4119 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4121 rdev->bdev->bd_contains ==
4122 rdev2->bdev->bd_contains) {
4124 "%s: WARNING: %s appears to be"
4125 " on the same physical disk as"
4128 bdevname(rdev->bdev,b),
4129 bdevname(rdev2->bdev,b2));
4136 "True protection against single-disk"
4137 " failure might be compromised.\n");
4140 mddev->recovery = 0;
4141 /* may be over-ridden by personality */
4142 mddev->resync_max_sectors = mddev->dev_sectors;
4144 mddev->barriers_work = 1;
4145 mddev->ok_start_degraded = start_dirty_degraded;
4148 mddev->ro = 2; /* read-only, but switch on first write */
4150 err = mddev->pers->run(mddev);
4152 printk(KERN_ERR "md: pers->run() failed ...\n");
4153 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4154 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4155 " but 'external_size' not in effect?\n", __func__);
4157 "md: invalid array_size %llu > default size %llu\n",
4158 (unsigned long long)mddev->array_sectors / 2,
4159 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4161 mddev->pers->stop(mddev);
4163 if (err == 0 && mddev->pers->sync_request) {
4164 err = bitmap_create(mddev);
4166 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4167 mdname(mddev), err);
4168 mddev->pers->stop(mddev);
4172 module_put(mddev->pers->owner);
4174 bitmap_destroy(mddev);
4177 if (mddev->pers->sync_request) {
4178 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4180 "md: cannot register extra attributes for %s\n",
4182 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4183 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4186 atomic_set(&mddev->writes_pending,0);
4187 mddev->safemode = 0;
4188 mddev->safemode_timer.function = md_safemode_timeout;
4189 mddev->safemode_timer.data = (unsigned long) mddev;
4190 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4193 list_for_each_entry(rdev, &mddev->disks, same_set)
4194 if (rdev->raid_disk >= 0) {
4196 sprintf(nm, "rd%d", rdev->raid_disk);
4197 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4198 printk("md: cannot register %s for %s\n",
4202 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4205 md_update_sb(mddev, 0);
4207 set_capacity(disk, mddev->array_sectors);
4209 /* If there is a partially-recovered drive we need to
4210 * start recovery here. If we leave it to md_check_recovery,
4211 * it will remove the drives and not do the right thing
4213 if (mddev->degraded && !mddev->sync_thread) {
4215 list_for_each_entry(rdev, &mddev->disks, same_set)
4216 if (rdev->raid_disk >= 0 &&
4217 !test_bit(In_sync, &rdev->flags) &&
4218 !test_bit(Faulty, &rdev->flags))
4219 /* complete an interrupted recovery */
4221 if (spares && mddev->pers->sync_request) {
4222 mddev->recovery = 0;
4223 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4224 mddev->sync_thread = md_register_thread(md_do_sync,
4227 if (!mddev->sync_thread) {
4228 printk(KERN_ERR "%s: could not start resync"
4231 /* leave the spares where they are, it shouldn't hurt */
4232 mddev->recovery = 0;
4236 md_wakeup_thread(mddev->thread);
4237 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4240 md_new_event(mddev);
4241 sysfs_notify_dirent(mddev->sysfs_state);
4242 if (mddev->sysfs_action)
4243 sysfs_notify_dirent(mddev->sysfs_action);
4244 sysfs_notify(&mddev->kobj, NULL, "degraded");
4245 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4249 static int restart_array(mddev_t *mddev)
4251 struct gendisk *disk = mddev->gendisk;
4253 /* Complain if it has no devices */
4254 if (list_empty(&mddev->disks))
4260 mddev->safemode = 0;
4262 set_disk_ro(disk, 0);
4263 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4265 /* Kick recovery or resync if necessary */
4266 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4267 md_wakeup_thread(mddev->thread);
4268 md_wakeup_thread(mddev->sync_thread);
4269 sysfs_notify_dirent(mddev->sysfs_state);
4273 /* similar to deny_write_access, but accounts for our holding a reference
4274 * to the file ourselves */
4275 static int deny_bitmap_write_access(struct file * file)
4277 struct inode *inode = file->f_mapping->host;
4279 spin_lock(&inode->i_lock);
4280 if (atomic_read(&inode->i_writecount) > 1) {
4281 spin_unlock(&inode->i_lock);
4284 atomic_set(&inode->i_writecount, -1);
4285 spin_unlock(&inode->i_lock);
4290 static void restore_bitmap_write_access(struct file *file)
4292 struct inode *inode = file->f_mapping->host;
4294 spin_lock(&inode->i_lock);
4295 atomic_set(&inode->i_writecount, 1);
4296 spin_unlock(&inode->i_lock);
4300 * 0 - completely stop and dis-assemble array
4301 * 1 - switch to readonly
4302 * 2 - stop but do not disassemble array
4304 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4307 struct gendisk *disk = mddev->gendisk;
4310 if (atomic_read(&mddev->openers) > is_open) {
4311 printk("md: %s still in use.\n",mdname(mddev));
4317 if (mddev->sync_thread) {
4318 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4319 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4320 md_unregister_thread(mddev->sync_thread);
4321 mddev->sync_thread = NULL;
4324 del_timer_sync(&mddev->safemode_timer);
4327 case 1: /* readonly */
4333 case 0: /* disassemble */
4335 bitmap_flush(mddev);
4336 md_super_wait(mddev);
4338 set_disk_ro(disk, 0);
4340 mddev->pers->stop(mddev);
4341 mddev->queue->merge_bvec_fn = NULL;
4342 mddev->queue->unplug_fn = NULL;
4343 mddev->queue->backing_dev_info.congested_fn = NULL;
4344 module_put(mddev->pers->owner);
4345 if (mddev->pers->sync_request)
4346 mddev->private = &md_redundancy_group;
4348 /* tell userspace to handle 'inactive' */
4349 sysfs_notify_dirent(mddev->sysfs_state);
4351 list_for_each_entry(rdev, &mddev->disks, same_set)
4352 if (rdev->raid_disk >= 0) {
4354 sprintf(nm, "rd%d", rdev->raid_disk);
4355 sysfs_remove_link(&mddev->kobj, nm);
4358 set_capacity(disk, 0);
4364 if (!mddev->in_sync || mddev->flags) {
4365 /* mark array as shutdown cleanly */
4367 md_update_sb(mddev, 1);
4370 set_disk_ro(disk, 1);
4371 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4375 * Free resources if final stop
4379 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4381 bitmap_destroy(mddev);
4382 if (mddev->bitmap_file) {
4383 restore_bitmap_write_access(mddev->bitmap_file);
4384 fput(mddev->bitmap_file);
4385 mddev->bitmap_file = NULL;
4387 mddev->bitmap_offset = 0;
4389 /* make sure all md_delayed_delete calls have finished */
4390 flush_scheduled_work();
4392 export_array(mddev);
4394 mddev->array_sectors = 0;
4395 mddev->external_size = 0;
4396 mddev->dev_sectors = 0;
4397 mddev->raid_disks = 0;
4398 mddev->recovery_cp = 0;
4399 mddev->resync_min = 0;
4400 mddev->resync_max = MaxSector;
4401 mddev->reshape_position = MaxSector;
4402 mddev->external = 0;
4403 mddev->persistent = 0;
4404 mddev->level = LEVEL_NONE;
4405 mddev->clevel[0] = 0;
4408 mddev->metadata_type[0] = 0;
4409 mddev->chunk_sectors = 0;
4410 mddev->ctime = mddev->utime = 0;
4412 mddev->max_disks = 0;
4414 mddev->delta_disks = 0;
4415 mddev->new_level = LEVEL_NONE;
4416 mddev->new_layout = 0;
4417 mddev->new_chunk = 0;
4418 mddev->curr_resync = 0;
4419 mddev->resync_mismatches = 0;
4420 mddev->suspend_lo = mddev->suspend_hi = 0;
4421 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4422 mddev->recovery = 0;
4425 mddev->degraded = 0;
4426 mddev->barriers_work = 0;
4427 mddev->safemode = 0;
4428 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4429 if (mddev->hold_active == UNTIL_STOP)
4430 mddev->hold_active = 0;
4432 } else if (mddev->pers)
4433 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4436 blk_integrity_unregister(disk);
4437 md_new_event(mddev);
4438 sysfs_notify_dirent(mddev->sysfs_state);
4444 static void autorun_array(mddev_t *mddev)
4449 if (list_empty(&mddev->disks))
4452 printk(KERN_INFO "md: running: ");
4454 list_for_each_entry(rdev, &mddev->disks, same_set) {
4455 char b[BDEVNAME_SIZE];
4456 printk("<%s>", bdevname(rdev->bdev,b));
4460 err = do_md_run(mddev);
4462 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4463 do_md_stop(mddev, 0, 0);
4468 * lets try to run arrays based on all disks that have arrived
4469 * until now. (those are in pending_raid_disks)
4471 * the method: pick the first pending disk, collect all disks with
4472 * the same UUID, remove all from the pending list and put them into
4473 * the 'same_array' list. Then order this list based on superblock
4474 * update time (freshest comes first), kick out 'old' disks and
4475 * compare superblocks. If everything's fine then run it.
4477 * If "unit" is allocated, then bump its reference count
4479 static void autorun_devices(int part)
4481 mdk_rdev_t *rdev0, *rdev, *tmp;
4483 char b[BDEVNAME_SIZE];
4485 printk(KERN_INFO "md: autorun ...\n");
4486 while (!list_empty(&pending_raid_disks)) {
4489 LIST_HEAD(candidates);
4490 rdev0 = list_entry(pending_raid_disks.next,
4491 mdk_rdev_t, same_set);
4493 printk(KERN_INFO "md: considering %s ...\n",
4494 bdevname(rdev0->bdev,b));
4495 INIT_LIST_HEAD(&candidates);
4496 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4497 if (super_90_load(rdev, rdev0, 0) >= 0) {
4498 printk(KERN_INFO "md: adding %s ...\n",
4499 bdevname(rdev->bdev,b));
4500 list_move(&rdev->same_set, &candidates);
4503 * now we have a set of devices, with all of them having
4504 * mostly sane superblocks. It's time to allocate the
4508 dev = MKDEV(mdp_major,
4509 rdev0->preferred_minor << MdpMinorShift);
4510 unit = MINOR(dev) >> MdpMinorShift;
4512 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4515 if (rdev0->preferred_minor != unit) {
4516 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4517 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4521 md_probe(dev, NULL, NULL);
4522 mddev = mddev_find(dev);
4523 if (!mddev || !mddev->gendisk) {
4527 "md: cannot allocate memory for md drive.\n");
4530 if (mddev_lock(mddev))
4531 printk(KERN_WARNING "md: %s locked, cannot run\n",
4533 else if (mddev->raid_disks || mddev->major_version
4534 || !list_empty(&mddev->disks)) {
4536 "md: %s already running, cannot run %s\n",
4537 mdname(mddev), bdevname(rdev0->bdev,b));
4538 mddev_unlock(mddev);
4540 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4541 mddev->persistent = 1;
4542 rdev_for_each_list(rdev, tmp, &candidates) {
4543 list_del_init(&rdev->same_set);
4544 if (bind_rdev_to_array(rdev, mddev))
4547 autorun_array(mddev);
4548 mddev_unlock(mddev);
4550 /* on success, candidates will be empty, on error
4553 rdev_for_each_list(rdev, tmp, &candidates) {
4554 list_del_init(&rdev->same_set);
4559 printk(KERN_INFO "md: ... autorun DONE.\n");
4561 #endif /* !MODULE */
4563 static int get_version(void __user * arg)
4567 ver.major = MD_MAJOR_VERSION;
4568 ver.minor = MD_MINOR_VERSION;
4569 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4571 if (copy_to_user(arg, &ver, sizeof(ver)))
4577 static int get_array_info(mddev_t * mddev, void __user * arg)
4579 mdu_array_info_t info;
4580 int nr,working,active,failed,spare;
4583 nr=working=active=failed=spare=0;
4584 list_for_each_entry(rdev, &mddev->disks, same_set) {
4586 if (test_bit(Faulty, &rdev->flags))
4590 if (test_bit(In_sync, &rdev->flags))
4597 info.major_version = mddev->major_version;
4598 info.minor_version = mddev->minor_version;
4599 info.patch_version = MD_PATCHLEVEL_VERSION;
4600 info.ctime = mddev->ctime;
4601 info.level = mddev->level;
4602 info.size = mddev->dev_sectors / 2;
4603 if (info.size != mddev->dev_sectors / 2) /* overflow */
4606 info.raid_disks = mddev->raid_disks;
4607 info.md_minor = mddev->md_minor;
4608 info.not_persistent= !mddev->persistent;
4610 info.utime = mddev->utime;
4613 info.state = (1<<MD_SB_CLEAN);
4614 if (mddev->bitmap && mddev->bitmap_offset)
4615 info.state = (1<<MD_SB_BITMAP_PRESENT);
4616 info.active_disks = active;
4617 info.working_disks = working;
4618 info.failed_disks = failed;
4619 info.spare_disks = spare;
4621 info.layout = mddev->layout;
4622 info.chunk_size = mddev->chunk_sectors << 9;
4624 if (copy_to_user(arg, &info, sizeof(info)))
4630 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4632 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4633 char *ptr, *buf = NULL;
4636 if (md_allow_write(mddev))
4637 file = kmalloc(sizeof(*file), GFP_NOIO);
4639 file = kmalloc(sizeof(*file), GFP_KERNEL);
4644 /* bitmap disabled, zero the first byte and copy out */
4645 if (!mddev->bitmap || !mddev->bitmap->file) {
4646 file->pathname[0] = '\0';
4650 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4654 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4658 strcpy(file->pathname, ptr);
4662 if (copy_to_user(arg, file, sizeof(*file)))
4670 static int get_disk_info(mddev_t * mddev, void __user * arg)
4672 mdu_disk_info_t info;
4675 if (copy_from_user(&info, arg, sizeof(info)))
4678 rdev = find_rdev_nr(mddev, info.number);
4680 info.major = MAJOR(rdev->bdev->bd_dev);
4681 info.minor = MINOR(rdev->bdev->bd_dev);
4682 info.raid_disk = rdev->raid_disk;
4684 if (test_bit(Faulty, &rdev->flags))
4685 info.state |= (1<<MD_DISK_FAULTY);
4686 else if (test_bit(In_sync, &rdev->flags)) {
4687 info.state |= (1<<MD_DISK_ACTIVE);
4688 info.state |= (1<<MD_DISK_SYNC);
4690 if (test_bit(WriteMostly, &rdev->flags))
4691 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4693 info.major = info.minor = 0;
4694 info.raid_disk = -1;
4695 info.state = (1<<MD_DISK_REMOVED);
4698 if (copy_to_user(arg, &info, sizeof(info)))
4704 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4706 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4708 dev_t dev = MKDEV(info->major,info->minor);
4710 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4713 if (!mddev->raid_disks) {
4715 /* expecting a device which has a superblock */
4716 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4719 "md: md_import_device returned %ld\n",
4721 return PTR_ERR(rdev);
4723 if (!list_empty(&mddev->disks)) {
4724 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4725 mdk_rdev_t, same_set);
4726 int err = super_types[mddev->major_version]
4727 .load_super(rdev, rdev0, mddev->minor_version);
4730 "md: %s has different UUID to %s\n",
4731 bdevname(rdev->bdev,b),
4732 bdevname(rdev0->bdev,b2));
4737 err = bind_rdev_to_array(rdev, mddev);
4744 * add_new_disk can be used once the array is assembled
4745 * to add "hot spares". They must already have a superblock
4750 if (!mddev->pers->hot_add_disk) {
4752 "%s: personality does not support diskops!\n",
4756 if (mddev->persistent)
4757 rdev = md_import_device(dev, mddev->major_version,
4758 mddev->minor_version);
4760 rdev = md_import_device(dev, -1, -1);
4763 "md: md_import_device returned %ld\n",
4765 return PTR_ERR(rdev);
4767 /* set save_raid_disk if appropriate */
4768 if (!mddev->persistent) {
4769 if (info->state & (1<<MD_DISK_SYNC) &&
4770 info->raid_disk < mddev->raid_disks)
4771 rdev->raid_disk = info->raid_disk;
4773 rdev->raid_disk = -1;
4775 super_types[mddev->major_version].
4776 validate_super(mddev, rdev);
4777 rdev->saved_raid_disk = rdev->raid_disk;
4779 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4780 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4781 set_bit(WriteMostly, &rdev->flags);
4783 clear_bit(WriteMostly, &rdev->flags);
4785 rdev->raid_disk = -1;
4786 err = bind_rdev_to_array(rdev, mddev);
4787 if (!err && !mddev->pers->hot_remove_disk) {
4788 /* If there is hot_add_disk but no hot_remove_disk
4789 * then added disks for geometry changes,
4790 * and should be added immediately.
4792 super_types[mddev->major_version].
4793 validate_super(mddev, rdev);
4794 err = mddev->pers->hot_add_disk(mddev, rdev);
4796 unbind_rdev_from_array(rdev);
4801 sysfs_notify_dirent(rdev->sysfs_state);
4803 md_update_sb(mddev, 1);
4804 if (mddev->degraded)
4805 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4806 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4807 md_wakeup_thread(mddev->thread);
4811 /* otherwise, add_new_disk is only allowed
4812 * for major_version==0 superblocks
4814 if (mddev->major_version != 0) {
4815 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4820 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4822 rdev = md_import_device(dev, -1, 0);
4825 "md: error, md_import_device() returned %ld\n",
4827 return PTR_ERR(rdev);
4829 rdev->desc_nr = info->number;
4830 if (info->raid_disk < mddev->raid_disks)
4831 rdev->raid_disk = info->raid_disk;
4833 rdev->raid_disk = -1;
4835 if (rdev->raid_disk < mddev->raid_disks)
4836 if (info->state & (1<<MD_DISK_SYNC))
4837 set_bit(In_sync, &rdev->flags);
4839 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4840 set_bit(WriteMostly, &rdev->flags);
4842 if (!mddev->persistent) {
4843 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4844 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4846 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4847 rdev->sectors = calc_num_sectors(rdev,
4848 mddev->chunk_sectors << 9);
4850 err = bind_rdev_to_array(rdev, mddev);
4860 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4862 char b[BDEVNAME_SIZE];
4865 rdev = find_rdev(mddev, dev);
4869 if (rdev->raid_disk >= 0)
4872 kick_rdev_from_array(rdev);
4873 md_update_sb(mddev, 1);
4874 md_new_event(mddev);
4878 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4879 bdevname(rdev->bdev,b), mdname(mddev));
4883 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4885 char b[BDEVNAME_SIZE];
4892 if (mddev->major_version != 0) {
4893 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4894 " version-0 superblocks.\n",
4898 if (!mddev->pers->hot_add_disk) {
4900 "%s: personality does not support diskops!\n",
4905 rdev = md_import_device(dev, -1, 0);
4908 "md: error, md_import_device() returned %ld\n",
4913 if (mddev->persistent)
4914 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4916 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4918 rdev->sectors = calc_num_sectors(rdev, mddev->chunk_sectors << 9);
4920 if (test_bit(Faulty, &rdev->flags)) {
4922 "md: can not hot-add faulty %s disk to %s!\n",
4923 bdevname(rdev->bdev,b), mdname(mddev));
4927 clear_bit(In_sync, &rdev->flags);
4929 rdev->saved_raid_disk = -1;
4930 err = bind_rdev_to_array(rdev, mddev);
4935 * The rest should better be atomic, we can have disk failures
4936 * noticed in interrupt contexts ...
4939 rdev->raid_disk = -1;
4941 md_update_sb(mddev, 1);
4944 * Kick recovery, maybe this spare has to be added to the
4945 * array immediately.
4947 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4948 md_wakeup_thread(mddev->thread);
4949 md_new_event(mddev);
4957 static int set_bitmap_file(mddev_t *mddev, int fd)
4962 if (!mddev->pers->quiesce)
4964 if (mddev->recovery || mddev->sync_thread)
4966 /* we should be able to change the bitmap.. */
4972 return -EEXIST; /* cannot add when bitmap is present */
4973 mddev->bitmap_file = fget(fd);
4975 if (mddev->bitmap_file == NULL) {
4976 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4981 err = deny_bitmap_write_access(mddev->bitmap_file);
4983 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4985 fput(mddev->bitmap_file);
4986 mddev->bitmap_file = NULL;
4989 mddev->bitmap_offset = 0; /* file overrides offset */
4990 } else if (mddev->bitmap == NULL)
4991 return -ENOENT; /* cannot remove what isn't there */
4994 mddev->pers->quiesce(mddev, 1);
4996 err = bitmap_create(mddev);
4997 if (fd < 0 || err) {
4998 bitmap_destroy(mddev);
4999 fd = -1; /* make sure to put the file */
5001 mddev->pers->quiesce(mddev, 0);
5004 if (mddev->bitmap_file) {
5005 restore_bitmap_write_access(mddev->bitmap_file);
5006 fput(mddev->bitmap_file);
5008 mddev->bitmap_file = NULL;
5015 * set_array_info is used two different ways
5016 * The original usage is when creating a new array.
5017 * In this usage, raid_disks is > 0 and it together with
5018 * level, size, not_persistent,layout,chunksize determine the
5019 * shape of the array.
5020 * This will always create an array with a type-0.90.0 superblock.
5021 * The newer usage is when assembling an array.
5022 * In this case raid_disks will be 0, and the major_version field is
5023 * use to determine which style super-blocks are to be found on the devices.
5024 * The minor and patch _version numbers are also kept incase the
5025 * super_block handler wishes to interpret them.
5027 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5030 if (info->raid_disks == 0) {
5031 /* just setting version number for superblock loading */
5032 if (info->major_version < 0 ||
5033 info->major_version >= ARRAY_SIZE(super_types) ||
5034 super_types[info->major_version].name == NULL) {
5035 /* maybe try to auto-load a module? */
5037 "md: superblock version %d not known\n",
5038 info->major_version);
5041 mddev->major_version = info->major_version;
5042 mddev->minor_version = info->minor_version;
5043 mddev->patch_version = info->patch_version;
5044 mddev->persistent = !info->not_persistent;
5047 mddev->major_version = MD_MAJOR_VERSION;
5048 mddev->minor_version = MD_MINOR_VERSION;
5049 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5050 mddev->ctime = get_seconds();
5052 mddev->level = info->level;
5053 mddev->clevel[0] = 0;
5054 mddev->dev_sectors = 2 * (sector_t)info->size;
5055 mddev->raid_disks = info->raid_disks;
5056 /* don't set md_minor, it is determined by which /dev/md* was
5059 if (info->state & (1<<MD_SB_CLEAN))
5060 mddev->recovery_cp = MaxSector;
5062 mddev->recovery_cp = 0;
5063 mddev->persistent = ! info->not_persistent;
5064 mddev->external = 0;
5066 mddev->layout = info->layout;
5067 mddev->chunk_sectors = info->chunk_size >> 9;
5069 mddev->max_disks = MD_SB_DISKS;
5071 if (mddev->persistent)
5073 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5075 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
5076 mddev->bitmap_offset = 0;
5078 mddev->reshape_position = MaxSector;
5081 * Generate a 128 bit UUID
5083 get_random_bytes(mddev->uuid, 16);
5085 mddev->new_level = mddev->level;
5086 mddev->new_chunk = mddev->chunk_sectors << 9;
5087 mddev->new_layout = mddev->layout;
5088 mddev->delta_disks = 0;
5093 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5095 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5097 if (mddev->external_size)
5100 mddev->array_sectors = array_sectors;
5102 EXPORT_SYMBOL(md_set_array_sectors);
5104 static int update_size(mddev_t *mddev, sector_t num_sectors)
5108 int fit = (num_sectors == 0);
5110 if (mddev->pers->resize == NULL)
5112 /* The "num_sectors" is the number of sectors of each device that
5113 * is used. This can only make sense for arrays with redundancy.
5114 * linear and raid0 always use whatever space is available. We can only
5115 * consider changing this number if no resync or reconstruction is
5116 * happening, and if the new size is acceptable. It must fit before the
5117 * sb_start or, if that is <data_offset, it must fit before the size
5118 * of each device. If num_sectors is zero, we find the largest size
5122 if (mddev->sync_thread)
5125 /* Sorry, cannot grow a bitmap yet, just remove it,
5129 list_for_each_entry(rdev, &mddev->disks, same_set) {
5130 sector_t avail = rdev->sectors;
5132 if (fit && (num_sectors == 0 || num_sectors > avail))
5133 num_sectors = avail;
5134 if (avail < num_sectors)
5137 rv = mddev->pers->resize(mddev, num_sectors);
5139 struct block_device *bdev;
5141 bdev = bdget_disk(mddev->gendisk, 0);
5143 mutex_lock(&bdev->bd_inode->i_mutex);
5144 i_size_write(bdev->bd_inode,
5145 (loff_t)mddev->array_sectors << 9);
5146 mutex_unlock(&bdev->bd_inode->i_mutex);
5153 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5156 /* change the number of raid disks */
5157 if (mddev->pers->check_reshape == NULL)
5159 if (raid_disks <= 0 ||
5160 raid_disks >= mddev->max_disks)
5162 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5164 mddev->delta_disks = raid_disks - mddev->raid_disks;
5166 rv = mddev->pers->check_reshape(mddev);
5172 * update_array_info is used to change the configuration of an
5174 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5175 * fields in the info are checked against the array.
5176 * Any differences that cannot be handled will cause an error.
5177 * Normally, only one change can be managed at a time.
5179 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5185 /* calculate expected state,ignoring low bits */
5186 if (mddev->bitmap && mddev->bitmap_offset)
5187 state |= (1 << MD_SB_BITMAP_PRESENT);
5189 if (mddev->major_version != info->major_version ||
5190 mddev->minor_version != info->minor_version ||
5191 /* mddev->patch_version != info->patch_version || */
5192 mddev->ctime != info->ctime ||
5193 mddev->level != info->level ||
5194 /* mddev->layout != info->layout || */
5195 !mddev->persistent != info->not_persistent||
5196 mddev->chunk_sectors != info->chunk_size >> 9 ||
5197 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5198 ((state^info->state) & 0xfffffe00)
5201 /* Check there is only one change */
5202 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5204 if (mddev->raid_disks != info->raid_disks)
5206 if (mddev->layout != info->layout)
5208 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5215 if (mddev->layout != info->layout) {
5217 * we don't need to do anything at the md level, the
5218 * personality will take care of it all.
5220 if (mddev->pers->reconfig == NULL)
5223 return mddev->pers->reconfig(mddev, info->layout, -1);
5225 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5226 rv = update_size(mddev, (sector_t)info->size * 2);
5228 if (mddev->raid_disks != info->raid_disks)
5229 rv = update_raid_disks(mddev, info->raid_disks);
5231 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5232 if (mddev->pers->quiesce == NULL)
5234 if (mddev->recovery || mddev->sync_thread)
5236 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5237 /* add the bitmap */
5240 if (mddev->default_bitmap_offset == 0)
5242 mddev->bitmap_offset = mddev->default_bitmap_offset;
5243 mddev->pers->quiesce(mddev, 1);
5244 rv = bitmap_create(mddev);
5246 bitmap_destroy(mddev);
5247 mddev->pers->quiesce(mddev, 0);
5249 /* remove the bitmap */
5252 if (mddev->bitmap->file)
5254 mddev->pers->quiesce(mddev, 1);
5255 bitmap_destroy(mddev);
5256 mddev->pers->quiesce(mddev, 0);
5257 mddev->bitmap_offset = 0;
5260 md_update_sb(mddev, 1);
5264 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5268 if (mddev->pers == NULL)
5271 rdev = find_rdev(mddev, dev);
5275 md_error(mddev, rdev);
5280 * We have a problem here : there is no easy way to give a CHS
5281 * virtual geometry. We currently pretend that we have a 2 heads
5282 * 4 sectors (with a BIG number of cylinders...). This drives
5283 * dosfs just mad... ;-)
5285 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5287 mddev_t *mddev = bdev->bd_disk->private_data;
5291 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5295 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5296 unsigned int cmd, unsigned long arg)
5299 void __user *argp = (void __user *)arg;
5300 mddev_t *mddev = NULL;
5302 if (!capable(CAP_SYS_ADMIN))
5306 * Commands dealing with the RAID driver but not any
5312 err = get_version(argp);
5315 case PRINT_RAID_DEBUG:
5323 autostart_arrays(arg);
5330 * Commands creating/starting a new array:
5333 mddev = bdev->bd_disk->private_data;
5340 err = mddev_lock(mddev);
5343 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5350 case SET_ARRAY_INFO:
5352 mdu_array_info_t info;
5354 memset(&info, 0, sizeof(info));
5355 else if (copy_from_user(&info, argp, sizeof(info))) {
5360 err = update_array_info(mddev, &info);
5362 printk(KERN_WARNING "md: couldn't update"
5363 " array info. %d\n", err);
5368 if (!list_empty(&mddev->disks)) {
5370 "md: array %s already has disks!\n",
5375 if (mddev->raid_disks) {
5377 "md: array %s already initialised!\n",
5382 err = set_array_info(mddev, &info);
5384 printk(KERN_WARNING "md: couldn't set"
5385 " array info. %d\n", err);
5395 * Commands querying/configuring an existing array:
5397 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5398 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5399 if ((!mddev->raid_disks && !mddev->external)
5400 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5401 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5402 && cmd != GET_BITMAP_FILE) {
5408 * Commands even a read-only array can execute:
5412 case GET_ARRAY_INFO:
5413 err = get_array_info(mddev, argp);
5416 case GET_BITMAP_FILE:
5417 err = get_bitmap_file(mddev, argp);
5421 err = get_disk_info(mddev, argp);
5424 case RESTART_ARRAY_RW:
5425 err = restart_array(mddev);
5429 err = do_md_stop(mddev, 0, 1);
5433 err = do_md_stop(mddev, 1, 1);
5439 * The remaining ioctls are changing the state of the
5440 * superblock, so we do not allow them on read-only arrays.
5441 * However non-MD ioctls (e.g. get-size) will still come through
5442 * here and hit the 'default' below, so only disallow
5443 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5445 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5446 if (mddev->ro == 2) {
5448 sysfs_notify_dirent(mddev->sysfs_state);
5449 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5450 md_wakeup_thread(mddev->thread);
5461 mdu_disk_info_t info;
5462 if (copy_from_user(&info, argp, sizeof(info)))
5465 err = add_new_disk(mddev, &info);
5469 case HOT_REMOVE_DISK:
5470 err = hot_remove_disk(mddev, new_decode_dev(arg));
5474 err = hot_add_disk(mddev, new_decode_dev(arg));
5477 case SET_DISK_FAULTY:
5478 err = set_disk_faulty(mddev, new_decode_dev(arg));
5482 err = do_md_run(mddev);
5485 case SET_BITMAP_FILE:
5486 err = set_bitmap_file(mddev, (int)arg);
5496 if (mddev->hold_active == UNTIL_IOCTL &&
5498 mddev->hold_active = 0;
5499 mddev_unlock(mddev);
5509 static int md_open(struct block_device *bdev, fmode_t mode)
5512 * Succeed if we can lock the mddev, which confirms that
5513 * it isn't being stopped right now.
5515 mddev_t *mddev = mddev_find(bdev->bd_dev);
5518 if (mddev->gendisk != bdev->bd_disk) {
5519 /* we are racing with mddev_put which is discarding this
5523 /* Wait until bdev->bd_disk is definitely gone */
5524 flush_scheduled_work();
5525 /* Then retry the open from the top */
5526 return -ERESTARTSYS;
5528 BUG_ON(mddev != bdev->bd_disk->private_data);
5530 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5534 atomic_inc(&mddev->openers);
5535 mddev_unlock(mddev);
5537 check_disk_change(bdev);
5542 static int md_release(struct gendisk *disk, fmode_t mode)
5544 mddev_t *mddev = disk->private_data;
5547 atomic_dec(&mddev->openers);
5553 static int md_media_changed(struct gendisk *disk)
5555 mddev_t *mddev = disk->private_data;
5557 return mddev->changed;
5560 static int md_revalidate(struct gendisk *disk)
5562 mddev_t *mddev = disk->private_data;
5567 static struct block_device_operations md_fops =
5569 .owner = THIS_MODULE,
5571 .release = md_release,
5573 .getgeo = md_getgeo,
5574 .media_changed = md_media_changed,
5575 .revalidate_disk= md_revalidate,
5578 static int md_thread(void * arg)
5580 mdk_thread_t *thread = arg;
5583 * md_thread is a 'system-thread', it's priority should be very
5584 * high. We avoid resource deadlocks individually in each
5585 * raid personality. (RAID5 does preallocation) We also use RR and
5586 * the very same RT priority as kswapd, thus we will never get
5587 * into a priority inversion deadlock.
5589 * we definitely have to have equal or higher priority than
5590 * bdflush, otherwise bdflush will deadlock if there are too
5591 * many dirty RAID5 blocks.
5594 allow_signal(SIGKILL);
5595 while (!kthread_should_stop()) {
5597 /* We need to wait INTERRUPTIBLE so that
5598 * we don't add to the load-average.
5599 * That means we need to be sure no signals are
5602 if (signal_pending(current))
5603 flush_signals(current);
5605 wait_event_interruptible_timeout
5607 test_bit(THREAD_WAKEUP, &thread->flags)
5608 || kthread_should_stop(),
5611 clear_bit(THREAD_WAKEUP, &thread->flags);
5613 thread->run(thread->mddev);
5619 void md_wakeup_thread(mdk_thread_t *thread)
5622 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5623 set_bit(THREAD_WAKEUP, &thread->flags);
5624 wake_up(&thread->wqueue);
5628 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5631 mdk_thread_t *thread;
5633 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5637 init_waitqueue_head(&thread->wqueue);
5640 thread->mddev = mddev;
5641 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5642 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5643 if (IS_ERR(thread->tsk)) {
5650 void md_unregister_thread(mdk_thread_t *thread)
5654 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5656 kthread_stop(thread->tsk);
5660 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5667 if (!rdev || test_bit(Faulty, &rdev->flags))
5670 if (mddev->external)
5671 set_bit(Blocked, &rdev->flags);
5673 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5675 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5676 __builtin_return_address(0),__builtin_return_address(1),
5677 __builtin_return_address(2),__builtin_return_address(3));
5681 if (!mddev->pers->error_handler)
5683 mddev->pers->error_handler(mddev,rdev);
5684 if (mddev->degraded)
5685 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5686 set_bit(StateChanged, &rdev->flags);
5687 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5688 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5689 md_wakeup_thread(mddev->thread);
5690 md_new_event_inintr(mddev);
5693 /* seq_file implementation /proc/mdstat */
5695 static void status_unused(struct seq_file *seq)
5700 seq_printf(seq, "unused devices: ");
5702 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5703 char b[BDEVNAME_SIZE];
5705 seq_printf(seq, "%s ",
5706 bdevname(rdev->bdev,b));
5709 seq_printf(seq, "<none>");
5711 seq_printf(seq, "\n");
5715 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5717 sector_t max_sectors, resync, res;
5718 unsigned long dt, db;
5721 unsigned int per_milli;
5723 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5725 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5726 max_sectors = mddev->resync_max_sectors;
5728 max_sectors = mddev->dev_sectors;
5731 * Should not happen.
5737 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5738 * in a sector_t, and (max_sectors>>scale) will fit in a
5739 * u32, as those are the requirements for sector_div.
5740 * Thus 'scale' must be at least 10
5743 if (sizeof(sector_t) > sizeof(unsigned long)) {
5744 while ( max_sectors/2 > (1ULL<<(scale+32)))
5747 res = (resync>>scale)*1000;
5748 sector_div(res, (u32)((max_sectors>>scale)+1));
5752 int i, x = per_milli/50, y = 20-x;
5753 seq_printf(seq, "[");
5754 for (i = 0; i < x; i++)
5755 seq_printf(seq, "=");
5756 seq_printf(seq, ">");
5757 for (i = 0; i < y; i++)
5758 seq_printf(seq, ".");
5759 seq_printf(seq, "] ");
5761 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5762 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5764 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5766 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5767 "resync" : "recovery"))),
5768 per_milli/10, per_milli % 10,
5769 (unsigned long long) resync/2,
5770 (unsigned long long) max_sectors/2);
5773 * dt: time from mark until now
5774 * db: blocks written from mark until now
5775 * rt: remaining time
5777 * rt is a sector_t, so could be 32bit or 64bit.
5778 * So we divide before multiply in case it is 32bit and close
5780 * We scale the divisor (db) by 32 to avoid loosing precision
5781 * near the end of resync when the number of remaining sectors
5783 * We then divide rt by 32 after multiplying by db to compensate.
5784 * The '+1' avoids division by zero if db is very small.
5786 dt = ((jiffies - mddev->resync_mark) / HZ);
5788 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5789 - mddev->resync_mark_cnt;
5791 rt = max_sectors - resync; /* number of remaining sectors */
5792 sector_div(rt, db/32+1);
5796 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
5797 ((unsigned long)rt % 60)/6);
5799 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5802 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5804 struct list_head *tmp;
5814 spin_lock(&all_mddevs_lock);
5815 list_for_each(tmp,&all_mddevs)
5817 mddev = list_entry(tmp, mddev_t, all_mddevs);
5819 spin_unlock(&all_mddevs_lock);
5822 spin_unlock(&all_mddevs_lock);
5824 return (void*)2;/* tail */
5828 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5830 struct list_head *tmp;
5831 mddev_t *next_mddev, *mddev = v;
5837 spin_lock(&all_mddevs_lock);
5839 tmp = all_mddevs.next;
5841 tmp = mddev->all_mddevs.next;
5842 if (tmp != &all_mddevs)
5843 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5845 next_mddev = (void*)2;
5848 spin_unlock(&all_mddevs_lock);
5856 static void md_seq_stop(struct seq_file *seq, void *v)
5860 if (mddev && v != (void*)1 && v != (void*)2)
5864 struct mdstat_info {
5868 static int md_seq_show(struct seq_file *seq, void *v)
5873 struct mdstat_info *mi = seq->private;
5874 struct bitmap *bitmap;
5876 if (v == (void*)1) {
5877 struct mdk_personality *pers;
5878 seq_printf(seq, "Personalities : ");
5879 spin_lock(&pers_lock);
5880 list_for_each_entry(pers, &pers_list, list)
5881 seq_printf(seq, "[%s] ", pers->name);
5883 spin_unlock(&pers_lock);
5884 seq_printf(seq, "\n");
5885 mi->event = atomic_read(&md_event_count);
5888 if (v == (void*)2) {
5893 if (mddev_lock(mddev) < 0)
5896 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5897 seq_printf(seq, "%s : %sactive", mdname(mddev),
5898 mddev->pers ? "" : "in");
5901 seq_printf(seq, " (read-only)");
5903 seq_printf(seq, " (auto-read-only)");
5904 seq_printf(seq, " %s", mddev->pers->name);
5908 list_for_each_entry(rdev, &mddev->disks, same_set) {
5909 char b[BDEVNAME_SIZE];
5910 seq_printf(seq, " %s[%d]",
5911 bdevname(rdev->bdev,b), rdev->desc_nr);
5912 if (test_bit(WriteMostly, &rdev->flags))
5913 seq_printf(seq, "(W)");
5914 if (test_bit(Faulty, &rdev->flags)) {
5915 seq_printf(seq, "(F)");
5917 } else if (rdev->raid_disk < 0)
5918 seq_printf(seq, "(S)"); /* spare */
5919 sectors += rdev->sectors;
5922 if (!list_empty(&mddev->disks)) {
5924 seq_printf(seq, "\n %llu blocks",
5925 (unsigned long long)
5926 mddev->array_sectors / 2);
5928 seq_printf(seq, "\n %llu blocks",
5929 (unsigned long long)sectors / 2);
5931 if (mddev->persistent) {
5932 if (mddev->major_version != 0 ||
5933 mddev->minor_version != 90) {
5934 seq_printf(seq," super %d.%d",
5935 mddev->major_version,
5936 mddev->minor_version);
5938 } else if (mddev->external)
5939 seq_printf(seq, " super external:%s",
5940 mddev->metadata_type);
5942 seq_printf(seq, " super non-persistent");
5945 mddev->pers->status(seq, mddev);
5946 seq_printf(seq, "\n ");
5947 if (mddev->pers->sync_request) {
5948 if (mddev->curr_resync > 2) {
5949 status_resync(seq, mddev);
5950 seq_printf(seq, "\n ");
5951 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5952 seq_printf(seq, "\tresync=DELAYED\n ");
5953 else if (mddev->recovery_cp < MaxSector)
5954 seq_printf(seq, "\tresync=PENDING\n ");
5957 seq_printf(seq, "\n ");
5959 if ((bitmap = mddev->bitmap)) {
5960 unsigned long chunk_kb;
5961 unsigned long flags;
5962 spin_lock_irqsave(&bitmap->lock, flags);
5963 chunk_kb = bitmap->chunksize >> 10;
5964 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5966 bitmap->pages - bitmap->missing_pages,
5968 (bitmap->pages - bitmap->missing_pages)
5969 << (PAGE_SHIFT - 10),
5970 chunk_kb ? chunk_kb : bitmap->chunksize,
5971 chunk_kb ? "KB" : "B");
5973 seq_printf(seq, ", file: ");
5974 seq_path(seq, &bitmap->file->f_path, " \t\n");
5977 seq_printf(seq, "\n");
5978 spin_unlock_irqrestore(&bitmap->lock, flags);
5981 seq_printf(seq, "\n");
5983 mddev_unlock(mddev);
5988 static const struct seq_operations md_seq_ops = {
5989 .start = md_seq_start,
5990 .next = md_seq_next,
5991 .stop = md_seq_stop,
5992 .show = md_seq_show,
5995 static int md_seq_open(struct inode *inode, struct file *file)
5998 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6002 error = seq_open(file, &md_seq_ops);
6006 struct seq_file *p = file->private_data;
6008 mi->event = atomic_read(&md_event_count);
6013 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6015 struct seq_file *m = filp->private_data;
6016 struct mdstat_info *mi = m->private;
6019 poll_wait(filp, &md_event_waiters, wait);
6021 /* always allow read */
6022 mask = POLLIN | POLLRDNORM;
6024 if (mi->event != atomic_read(&md_event_count))
6025 mask |= POLLERR | POLLPRI;
6029 static const struct file_operations md_seq_fops = {
6030 .owner = THIS_MODULE,
6031 .open = md_seq_open,
6033 .llseek = seq_lseek,
6034 .release = seq_release_private,
6035 .poll = mdstat_poll,
6038 int register_md_personality(struct mdk_personality *p)
6040 spin_lock(&pers_lock);
6041 list_add_tail(&p->list, &pers_list);
6042 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6043 spin_unlock(&pers_lock);
6047 int unregister_md_personality(struct mdk_personality *p)
6049 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6050 spin_lock(&pers_lock);
6051 list_del_init(&p->list);
6052 spin_unlock(&pers_lock);
6056 static int is_mddev_idle(mddev_t *mddev, int init)
6064 rdev_for_each_rcu(rdev, mddev) {
6065 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6066 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6067 (int)part_stat_read(&disk->part0, sectors[1]) -
6068 atomic_read(&disk->sync_io);
6069 /* sync IO will cause sync_io to increase before the disk_stats
6070 * as sync_io is counted when a request starts, and
6071 * disk_stats is counted when it completes.
6072 * So resync activity will cause curr_events to be smaller than
6073 * when there was no such activity.
6074 * non-sync IO will cause disk_stat to increase without
6075 * increasing sync_io so curr_events will (eventually)
6076 * be larger than it was before. Once it becomes
6077 * substantially larger, the test below will cause
6078 * the array to appear non-idle, and resync will slow
6080 * If there is a lot of outstanding resync activity when
6081 * we set last_event to curr_events, then all that activity
6082 * completing might cause the array to appear non-idle
6083 * and resync will be slowed down even though there might
6084 * not have been non-resync activity. This will only
6085 * happen once though. 'last_events' will soon reflect
6086 * the state where there is little or no outstanding
6087 * resync requests, and further resync activity will
6088 * always make curr_events less than last_events.
6091 if (init || curr_events - rdev->last_events > 64) {
6092 rdev->last_events = curr_events;
6100 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6102 /* another "blocks" (512byte) blocks have been synced */
6103 atomic_sub(blocks, &mddev->recovery_active);
6104 wake_up(&mddev->recovery_wait);
6106 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6107 md_wakeup_thread(mddev->thread);
6108 // stop recovery, signal do_sync ....
6113 /* md_write_start(mddev, bi)
6114 * If we need to update some array metadata (e.g. 'active' flag
6115 * in superblock) before writing, schedule a superblock update
6116 * and wait for it to complete.
6118 void md_write_start(mddev_t *mddev, struct bio *bi)
6121 if (bio_data_dir(bi) != WRITE)
6124 BUG_ON(mddev->ro == 1);
6125 if (mddev->ro == 2) {
6126 /* need to switch to read/write */
6128 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6129 md_wakeup_thread(mddev->thread);
6130 md_wakeup_thread(mddev->sync_thread);
6133 atomic_inc(&mddev->writes_pending);
6134 if (mddev->safemode == 1)
6135 mddev->safemode = 0;
6136 if (mddev->in_sync) {
6137 spin_lock_irq(&mddev->write_lock);
6138 if (mddev->in_sync) {
6140 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6141 md_wakeup_thread(mddev->thread);
6144 spin_unlock_irq(&mddev->write_lock);
6147 sysfs_notify_dirent(mddev->sysfs_state);
6148 wait_event(mddev->sb_wait,
6149 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6150 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6153 void md_write_end(mddev_t *mddev)
6155 if (atomic_dec_and_test(&mddev->writes_pending)) {
6156 if (mddev->safemode == 2)
6157 md_wakeup_thread(mddev->thread);
6158 else if (mddev->safemode_delay)
6159 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6163 /* md_allow_write(mddev)
6164 * Calling this ensures that the array is marked 'active' so that writes
6165 * may proceed without blocking. It is important to call this before
6166 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6167 * Must be called with mddev_lock held.
6169 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6170 * is dropped, so return -EAGAIN after notifying userspace.
6172 int md_allow_write(mddev_t *mddev)
6178 if (!mddev->pers->sync_request)
6181 spin_lock_irq(&mddev->write_lock);
6182 if (mddev->in_sync) {
6184 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6185 if (mddev->safemode_delay &&
6186 mddev->safemode == 0)
6187 mddev->safemode = 1;
6188 spin_unlock_irq(&mddev->write_lock);
6189 md_update_sb(mddev, 0);
6190 sysfs_notify_dirent(mddev->sysfs_state);
6192 spin_unlock_irq(&mddev->write_lock);
6194 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6199 EXPORT_SYMBOL_GPL(md_allow_write);
6201 #define SYNC_MARKS 10
6202 #define SYNC_MARK_STEP (3*HZ)
6203 void md_do_sync(mddev_t *mddev)
6206 unsigned int currspeed = 0,
6208 sector_t max_sectors,j, io_sectors;
6209 unsigned long mark[SYNC_MARKS];
6210 sector_t mark_cnt[SYNC_MARKS];
6212 struct list_head *tmp;
6213 sector_t last_check;
6218 /* just incase thread restarts... */
6219 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6221 if (mddev->ro) /* never try to sync a read-only array */
6224 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6225 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6226 desc = "data-check";
6227 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6228 desc = "requested-resync";
6231 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6236 /* we overload curr_resync somewhat here.
6237 * 0 == not engaged in resync at all
6238 * 2 == checking that there is no conflict with another sync
6239 * 1 == like 2, but have yielded to allow conflicting resync to
6241 * other == active in resync - this many blocks
6243 * Before starting a resync we must have set curr_resync to
6244 * 2, and then checked that every "conflicting" array has curr_resync
6245 * less than ours. When we find one that is the same or higher
6246 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6247 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6248 * This will mean we have to start checking from the beginning again.
6253 mddev->curr_resync = 2;
6256 if (kthread_should_stop()) {
6257 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6260 for_each_mddev(mddev2, tmp) {
6261 if (mddev2 == mddev)
6263 if (!mddev->parallel_resync
6264 && mddev2->curr_resync
6265 && match_mddev_units(mddev, mddev2)) {
6267 if (mddev < mddev2 && mddev->curr_resync == 2) {
6268 /* arbitrarily yield */
6269 mddev->curr_resync = 1;
6270 wake_up(&resync_wait);
6272 if (mddev > mddev2 && mddev->curr_resync == 1)
6273 /* no need to wait here, we can wait the next
6274 * time 'round when curr_resync == 2
6277 /* We need to wait 'interruptible' so as not to
6278 * contribute to the load average, and not to
6279 * be caught by 'softlockup'
6281 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6282 if (!kthread_should_stop() &&
6283 mddev2->curr_resync >= mddev->curr_resync) {
6284 printk(KERN_INFO "md: delaying %s of %s"
6285 " until %s has finished (they"
6286 " share one or more physical units)\n",
6287 desc, mdname(mddev), mdname(mddev2));
6289 if (signal_pending(current))
6290 flush_signals(current);
6292 finish_wait(&resync_wait, &wq);
6295 finish_wait(&resync_wait, &wq);
6298 } while (mddev->curr_resync < 2);
6301 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6302 /* resync follows the size requested by the personality,
6303 * which defaults to physical size, but can be virtual size
6305 max_sectors = mddev->resync_max_sectors;
6306 mddev->resync_mismatches = 0;
6307 /* we don't use the checkpoint if there's a bitmap */
6308 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6309 j = mddev->resync_min;
6310 else if (!mddev->bitmap)
6311 j = mddev->recovery_cp;
6313 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6314 max_sectors = mddev->dev_sectors;
6316 /* recovery follows the physical size of devices */
6317 max_sectors = mddev->dev_sectors;
6319 list_for_each_entry(rdev, &mddev->disks, same_set)
6320 if (rdev->raid_disk >= 0 &&
6321 !test_bit(Faulty, &rdev->flags) &&
6322 !test_bit(In_sync, &rdev->flags) &&
6323 rdev->recovery_offset < j)
6324 j = rdev->recovery_offset;
6327 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6328 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6329 " %d KB/sec/disk.\n", speed_min(mddev));
6330 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6331 "(but not more than %d KB/sec) for %s.\n",
6332 speed_max(mddev), desc);
6334 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6337 for (m = 0; m < SYNC_MARKS; m++) {
6339 mark_cnt[m] = io_sectors;
6342 mddev->resync_mark = mark[last_mark];
6343 mddev->resync_mark_cnt = mark_cnt[last_mark];
6346 * Tune reconstruction:
6348 window = 32*(PAGE_SIZE/512);
6349 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6350 window/2,(unsigned long long) max_sectors/2);
6352 atomic_set(&mddev->recovery_active, 0);
6357 "md: resuming %s of %s from checkpoint.\n",
6358 desc, mdname(mddev));
6359 mddev->curr_resync = j;
6362 while (j < max_sectors) {
6367 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6368 ((mddev->curr_resync > mddev->curr_resync_completed &&
6369 (mddev->curr_resync - mddev->curr_resync_completed)
6370 > (max_sectors >> 4)) ||
6371 (j - mddev->curr_resync_completed)*2
6372 >= mddev->resync_max - mddev->curr_resync_completed
6374 /* time to update curr_resync_completed */
6375 blk_unplug(mddev->queue);
6376 wait_event(mddev->recovery_wait,
6377 atomic_read(&mddev->recovery_active) == 0);
6378 mddev->curr_resync_completed =
6380 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6381 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6384 if (j >= mddev->resync_max)
6385 wait_event(mddev->recovery_wait,
6386 mddev->resync_max > j
6387 || kthread_should_stop());
6389 if (kthread_should_stop())
6392 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6393 currspeed < speed_min(mddev));
6395 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6399 if (!skipped) { /* actual IO requested */
6400 io_sectors += sectors;
6401 atomic_add(sectors, &mddev->recovery_active);
6405 if (j>1) mddev->curr_resync = j;
6406 mddev->curr_mark_cnt = io_sectors;
6407 if (last_check == 0)
6408 /* this is the earliers that rebuilt will be
6409 * visible in /proc/mdstat
6411 md_new_event(mddev);
6413 if (last_check + window > io_sectors || j == max_sectors)
6416 last_check = io_sectors;
6418 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6422 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6424 int next = (last_mark+1) % SYNC_MARKS;
6426 mddev->resync_mark = mark[next];
6427 mddev->resync_mark_cnt = mark_cnt[next];
6428 mark[next] = jiffies;
6429 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6434 if (kthread_should_stop())
6439 * this loop exits only if either when we are slower than
6440 * the 'hard' speed limit, or the system was IO-idle for
6442 * the system might be non-idle CPU-wise, but we only care
6443 * about not overloading the IO subsystem. (things like an
6444 * e2fsck being done on the RAID array should execute fast)
6446 blk_unplug(mddev->queue);
6449 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6450 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6452 if (currspeed > speed_min(mddev)) {
6453 if ((currspeed > speed_max(mddev)) ||
6454 !is_mddev_idle(mddev, 0)) {
6460 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6462 * this also signals 'finished resyncing' to md_stop
6465 blk_unplug(mddev->queue);
6467 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6469 /* tell personality that we are finished */
6470 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6472 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6473 mddev->curr_resync > 2) {
6474 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6475 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6476 if (mddev->curr_resync >= mddev->recovery_cp) {
6478 "md: checkpointing %s of %s.\n",
6479 desc, mdname(mddev));
6480 mddev->recovery_cp = mddev->curr_resync;
6483 mddev->recovery_cp = MaxSector;
6485 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6486 mddev->curr_resync = MaxSector;
6487 list_for_each_entry(rdev, &mddev->disks, same_set)
6488 if (rdev->raid_disk >= 0 &&
6489 !test_bit(Faulty, &rdev->flags) &&
6490 !test_bit(In_sync, &rdev->flags) &&
6491 rdev->recovery_offset < mddev->curr_resync)
6492 rdev->recovery_offset = mddev->curr_resync;
6495 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6498 mddev->curr_resync = 0;
6499 mddev->curr_resync_completed = 0;
6500 mddev->resync_min = 0;
6501 mddev->resync_max = MaxSector;
6502 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6503 wake_up(&resync_wait);
6504 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6505 md_wakeup_thread(mddev->thread);
6510 * got a signal, exit.
6513 "md: md_do_sync() got signal ... exiting\n");
6514 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6518 EXPORT_SYMBOL_GPL(md_do_sync);
6521 static int remove_and_add_spares(mddev_t *mddev)
6526 mddev->curr_resync_completed = 0;
6528 list_for_each_entry(rdev, &mddev->disks, same_set)
6529 if (rdev->raid_disk >= 0 &&
6530 !test_bit(Blocked, &rdev->flags) &&
6531 (test_bit(Faulty, &rdev->flags) ||
6532 ! test_bit(In_sync, &rdev->flags)) &&
6533 atomic_read(&rdev->nr_pending)==0) {
6534 if (mddev->pers->hot_remove_disk(
6535 mddev, rdev->raid_disk)==0) {
6537 sprintf(nm,"rd%d", rdev->raid_disk);
6538 sysfs_remove_link(&mddev->kobj, nm);
6539 rdev->raid_disk = -1;
6543 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6544 list_for_each_entry(rdev, &mddev->disks, same_set) {
6545 if (rdev->raid_disk >= 0 &&
6546 !test_bit(In_sync, &rdev->flags) &&
6547 !test_bit(Blocked, &rdev->flags))
6549 if (rdev->raid_disk < 0
6550 && !test_bit(Faulty, &rdev->flags)) {
6551 rdev->recovery_offset = 0;
6553 hot_add_disk(mddev, rdev) == 0) {
6555 sprintf(nm, "rd%d", rdev->raid_disk);
6556 if (sysfs_create_link(&mddev->kobj,
6559 "md: cannot register "
6563 md_new_event(mddev);
6572 * This routine is regularly called by all per-raid-array threads to
6573 * deal with generic issues like resync and super-block update.
6574 * Raid personalities that don't have a thread (linear/raid0) do not
6575 * need this as they never do any recovery or update the superblock.
6577 * It does not do any resync itself, but rather "forks" off other threads
6578 * to do that as needed.
6579 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6580 * "->recovery" and create a thread at ->sync_thread.
6581 * When the thread finishes it sets MD_RECOVERY_DONE
6582 * and wakeups up this thread which will reap the thread and finish up.
6583 * This thread also removes any faulty devices (with nr_pending == 0).
6585 * The overall approach is:
6586 * 1/ if the superblock needs updating, update it.
6587 * 2/ If a recovery thread is running, don't do anything else.
6588 * 3/ If recovery has finished, clean up, possibly marking spares active.
6589 * 4/ If there are any faulty devices, remove them.
6590 * 5/ If array is degraded, try to add spares devices
6591 * 6/ If array has spares or is not in-sync, start a resync thread.
6593 void md_check_recovery(mddev_t *mddev)
6599 bitmap_daemon_work(mddev->bitmap);
6604 if (signal_pending(current)) {
6605 if (mddev->pers->sync_request && !mddev->external) {
6606 printk(KERN_INFO "md: %s in immediate safe mode\n",
6608 mddev->safemode = 2;
6610 flush_signals(current);
6613 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6616 (mddev->flags && !mddev->external) ||
6617 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6618 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6619 (mddev->external == 0 && mddev->safemode == 1) ||
6620 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6621 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6625 if (mddev_trylock(mddev)) {
6629 /* Only thing we do on a ro array is remove
6632 remove_and_add_spares(mddev);
6633 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6637 if (!mddev->external) {
6639 spin_lock_irq(&mddev->write_lock);
6640 if (mddev->safemode &&
6641 !atomic_read(&mddev->writes_pending) &&
6643 mddev->recovery_cp == MaxSector) {
6646 if (mddev->persistent)
6647 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6649 if (mddev->safemode == 1)
6650 mddev->safemode = 0;
6651 spin_unlock_irq(&mddev->write_lock);
6653 sysfs_notify_dirent(mddev->sysfs_state);
6657 md_update_sb(mddev, 0);
6659 list_for_each_entry(rdev, &mddev->disks, same_set)
6660 if (test_and_clear_bit(StateChanged, &rdev->flags))
6661 sysfs_notify_dirent(rdev->sysfs_state);
6664 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6665 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6666 /* resync/recovery still happening */
6667 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6670 if (mddev->sync_thread) {
6671 /* resync has finished, collect result */
6672 md_unregister_thread(mddev->sync_thread);
6673 mddev->sync_thread = NULL;
6674 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6675 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6677 /* activate any spares */
6678 if (mddev->pers->spare_active(mddev))
6679 sysfs_notify(&mddev->kobj, NULL,
6682 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6683 mddev->pers->finish_reshape)
6684 mddev->pers->finish_reshape(mddev);
6685 md_update_sb(mddev, 1);
6687 /* if array is no-longer degraded, then any saved_raid_disk
6688 * information must be scrapped
6690 if (!mddev->degraded)
6691 list_for_each_entry(rdev, &mddev->disks, same_set)
6692 rdev->saved_raid_disk = -1;
6694 mddev->recovery = 0;
6695 /* flag recovery needed just to double check */
6696 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6697 sysfs_notify_dirent(mddev->sysfs_action);
6698 md_new_event(mddev);
6701 /* Set RUNNING before clearing NEEDED to avoid
6702 * any transients in the value of "sync_action".
6704 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6705 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6706 /* Clear some bits that don't mean anything, but
6709 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6710 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6712 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6714 /* no recovery is running.
6715 * remove any failed drives, then
6716 * add spares if possible.
6717 * Spare are also removed and re-added, to allow
6718 * the personality to fail the re-add.
6721 if (mddev->reshape_position != MaxSector) {
6722 if (mddev->pers->check_reshape(mddev) != 0)
6723 /* Cannot proceed */
6725 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6726 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6727 } else if ((spares = remove_and_add_spares(mddev))) {
6728 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6729 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6730 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6731 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6732 } else if (mddev->recovery_cp < MaxSector) {
6733 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6734 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6735 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6736 /* nothing to be done ... */
6739 if (mddev->pers->sync_request) {
6740 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6741 /* We are adding a device or devices to an array
6742 * which has the bitmap stored on all devices.
6743 * So make sure all bitmap pages get written
6745 bitmap_write_all(mddev->bitmap);
6747 mddev->sync_thread = md_register_thread(md_do_sync,
6750 if (!mddev->sync_thread) {
6751 printk(KERN_ERR "%s: could not start resync"
6754 /* leave the spares where they are, it shouldn't hurt */
6755 mddev->recovery = 0;
6757 md_wakeup_thread(mddev->sync_thread);
6758 sysfs_notify_dirent(mddev->sysfs_action);
6759 md_new_event(mddev);
6762 if (!mddev->sync_thread) {
6763 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6764 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6766 if (mddev->sysfs_action)
6767 sysfs_notify_dirent(mddev->sysfs_action);
6769 mddev_unlock(mddev);
6773 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6775 sysfs_notify_dirent(rdev->sysfs_state);
6776 wait_event_timeout(rdev->blocked_wait,
6777 !test_bit(Blocked, &rdev->flags),
6778 msecs_to_jiffies(5000));
6779 rdev_dec_pending(rdev, mddev);
6781 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6783 static int md_notify_reboot(struct notifier_block *this,
6784 unsigned long code, void *x)
6786 struct list_head *tmp;
6789 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6791 printk(KERN_INFO "md: stopping all md devices.\n");
6793 for_each_mddev(mddev, tmp)
6794 if (mddev_trylock(mddev)) {
6795 /* Force a switch to readonly even array
6796 * appears to still be in use. Hence
6799 do_md_stop(mddev, 1, 100);
6800 mddev_unlock(mddev);
6803 * certain more exotic SCSI devices are known to be
6804 * volatile wrt too early system reboots. While the
6805 * right place to handle this issue is the given
6806 * driver, we do want to have a safe RAID driver ...
6813 static struct notifier_block md_notifier = {
6814 .notifier_call = md_notify_reboot,
6816 .priority = INT_MAX, /* before any real devices */
6819 static void md_geninit(void)
6821 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6823 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6826 static int __init md_init(void)
6828 if (register_blkdev(MD_MAJOR, "md"))
6830 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6831 unregister_blkdev(MD_MAJOR, "md");
6834 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
6835 md_probe, NULL, NULL);
6836 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6837 md_probe, NULL, NULL);
6839 register_reboot_notifier(&md_notifier);
6840 raid_table_header = register_sysctl_table(raid_root_table);
6850 * Searches all registered partitions for autorun RAID arrays
6854 static LIST_HEAD(all_detected_devices);
6855 struct detected_devices_node {
6856 struct list_head list;
6860 void md_autodetect_dev(dev_t dev)
6862 struct detected_devices_node *node_detected_dev;
6864 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6865 if (node_detected_dev) {
6866 node_detected_dev->dev = dev;
6867 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6869 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6870 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6875 static void autostart_arrays(int part)
6878 struct detected_devices_node *node_detected_dev;
6880 int i_scanned, i_passed;
6885 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6887 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6889 node_detected_dev = list_entry(all_detected_devices.next,
6890 struct detected_devices_node, list);
6891 list_del(&node_detected_dev->list);
6892 dev = node_detected_dev->dev;
6893 kfree(node_detected_dev);
6894 rdev = md_import_device(dev,0, 90);
6898 if (test_bit(Faulty, &rdev->flags)) {
6902 set_bit(AutoDetected, &rdev->flags);
6903 list_add(&rdev->same_set, &pending_raid_disks);
6907 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6908 i_scanned, i_passed);
6910 autorun_devices(part);
6913 #endif /* !MODULE */
6915 static __exit void md_exit(void)
6918 struct list_head *tmp;
6920 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
6921 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6923 unregister_blkdev(MD_MAJOR,"md");
6924 unregister_blkdev(mdp_major, "mdp");
6925 unregister_reboot_notifier(&md_notifier);
6926 unregister_sysctl_table(raid_table_header);
6927 remove_proc_entry("mdstat", NULL);
6928 for_each_mddev(mddev, tmp) {
6929 export_array(mddev);
6930 mddev->hold_active = 0;
6934 subsys_initcall(md_init);
6935 module_exit(md_exit)
6937 static int get_ro(char *buffer, struct kernel_param *kp)
6939 return sprintf(buffer, "%d", start_readonly);
6941 static int set_ro(const char *val, struct kernel_param *kp)
6944 int num = simple_strtoul(val, &e, 10);
6945 if (*val && (*e == '\0' || *e == '\n')) {
6946 start_readonly = num;
6952 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6953 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6955 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6957 EXPORT_SYMBOL(register_md_personality);
6958 EXPORT_SYMBOL(unregister_md_personality);
6959 EXPORT_SYMBOL(md_error);
6960 EXPORT_SYMBOL(md_done_sync);
6961 EXPORT_SYMBOL(md_write_start);
6962 EXPORT_SYMBOL(md_write_end);
6963 EXPORT_SYMBOL(md_register_thread);
6964 EXPORT_SYMBOL(md_unregister_thread);
6965 EXPORT_SYMBOL(md_wakeup_thread);
6966 EXPORT_SYMBOL(md_check_recovery);
6967 MODULE_LICENSE("GPL");
6969 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);