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/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/reboot.h>
47 #include <linux/file.h>
48 #include <linux/compat.h>
49 #include <linux/delay.h>
50 #include <linux/raid/md_p.h>
51 #include <linux/raid/md_u.h>
52 #include <linux/slab.h>
57 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part);
64 static LIST_HEAD(pers_list);
65 static DEFINE_SPINLOCK(pers_lock);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
71 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
74 * Default number of read corrections we'll attempt on an rdev
75 * before ejecting it from the array. We divide the read error
76 * count by 2 for every hour elapsed between read errors.
78 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min = 1000;
93 static int sysctl_speed_limit_max = 200000;
94 static inline int speed_min(mddev_t *mddev)
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
100 static inline int speed_max(mddev_t *mddev)
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
106 static struct ctl_table_header *raid_table_header;
108 static ctl_table raid_table[] = {
110 .procname = "speed_limit_min",
111 .data = &sysctl_speed_limit_min,
112 .maxlen = sizeof(int),
113 .mode = S_IRUGO|S_IWUSR,
114 .proc_handler = proc_dointvec,
117 .procname = "speed_limit_max",
118 .data = &sysctl_speed_limit_max,
119 .maxlen = sizeof(int),
120 .mode = S_IRUGO|S_IWUSR,
121 .proc_handler = proc_dointvec,
126 static ctl_table raid_dir_table[] = {
130 .mode = S_IRUGO|S_IXUGO,
136 static ctl_table raid_root_table[] = {
141 .child = raid_dir_table,
146 static const struct block_device_operations md_fops;
148 static int start_readonly;
151 * We have a system wide 'event count' that is incremented
152 * on any 'interesting' event, and readers of /proc/mdstat
153 * can use 'poll' or 'select' to find out when the event
157 * start array, stop array, error, add device, remove device,
158 * start build, activate spare
160 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
161 static atomic_t md_event_count;
162 void md_new_event(mddev_t *mddev)
164 atomic_inc(&md_event_count);
165 wake_up(&md_event_waiters);
167 EXPORT_SYMBOL_GPL(md_new_event);
169 /* Alternate version that can be called from interrupts
170 * when calling sysfs_notify isn't needed.
172 static void md_new_event_inintr(mddev_t *mddev)
174 atomic_inc(&md_event_count);
175 wake_up(&md_event_waiters);
179 * Enables to iterate over all existing md arrays
180 * all_mddevs_lock protects this list.
182 static LIST_HEAD(all_mddevs);
183 static DEFINE_SPINLOCK(all_mddevs_lock);
187 * iterates through all used mddevs in the system.
188 * We take care to grab the all_mddevs_lock whenever navigating
189 * the list, and to always hold a refcount when unlocked.
190 * Any code which breaks out of this loop while own
191 * a reference to the current mddev and must mddev_put it.
193 #define for_each_mddev(mddev,tmp) \
195 for (({ spin_lock(&all_mddevs_lock); \
196 tmp = all_mddevs.next; \
198 ({ if (tmp != &all_mddevs) \
199 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
200 spin_unlock(&all_mddevs_lock); \
201 if (mddev) mddev_put(mddev); \
202 mddev = list_entry(tmp, mddev_t, all_mddevs); \
203 tmp != &all_mddevs;}); \
204 ({ spin_lock(&all_mddevs_lock); \
209 /* Rather than calling directly into the personality make_request function,
210 * IO requests come here first so that we can check if the device is
211 * being suspended pending a reconfiguration.
212 * We hold a refcount over the call to ->make_request. By the time that
213 * call has finished, the bio has been linked into some internal structure
214 * and so is visible to ->quiesce(), so we don't need the refcount any more.
216 static int md_make_request(struct request_queue *q, struct bio *bio)
218 const int rw = bio_data_dir(bio);
219 mddev_t *mddev = q->queuedata;
223 if (mddev == NULL || mddev->pers == NULL) {
228 if (mddev->suspended || mddev->barrier) {
231 prepare_to_wait(&mddev->sb_wait, &__wait,
232 TASK_UNINTERRUPTIBLE);
233 if (!mddev->suspended && !mddev->barrier)
239 finish_wait(&mddev->sb_wait, &__wait);
241 atomic_inc(&mddev->active_io);
244 rv = mddev->pers->make_request(mddev, bio);
246 cpu = part_stat_lock();
247 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
248 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
252 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
253 wake_up(&mddev->sb_wait);
258 /* mddev_suspend makes sure no new requests are submitted
259 * to the device, and that any requests that have been submitted
260 * are completely handled.
261 * Once ->stop is called and completes, the module will be completely
264 static void mddev_suspend(mddev_t *mddev)
266 BUG_ON(mddev->suspended);
267 mddev->suspended = 1;
269 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
270 mddev->pers->quiesce(mddev, 1);
273 static void mddev_resume(mddev_t *mddev)
275 mddev->suspended = 0;
276 wake_up(&mddev->sb_wait);
277 mddev->pers->quiesce(mddev, 0);
280 int mddev_congested(mddev_t *mddev, int bits)
284 return mddev->suspended;
286 EXPORT_SYMBOL(mddev_congested);
289 * Generic barrier handling for md
292 #define POST_REQUEST_BARRIER ((void*)1)
294 static void md_end_barrier(struct bio *bio, int err)
296 mdk_rdev_t *rdev = bio->bi_private;
297 mddev_t *mddev = rdev->mddev;
298 if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
299 set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
301 rdev_dec_pending(rdev, mddev);
303 if (atomic_dec_and_test(&mddev->flush_pending)) {
304 if (mddev->barrier == POST_REQUEST_BARRIER) {
305 /* This was a post-request barrier */
306 mddev->barrier = NULL;
307 wake_up(&mddev->sb_wait);
309 /* The pre-request barrier has finished */
310 schedule_work(&mddev->barrier_work);
315 static void submit_barriers(mddev_t *mddev)
320 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
321 if (rdev->raid_disk >= 0 &&
322 !test_bit(Faulty, &rdev->flags)) {
323 /* Take two references, one is dropped
324 * when request finishes, one after
325 * we reclaim rcu_read_lock
328 atomic_inc(&rdev->nr_pending);
329 atomic_inc(&rdev->nr_pending);
331 bi = bio_alloc(GFP_KERNEL, 0);
332 bi->bi_end_io = md_end_barrier;
333 bi->bi_private = rdev;
334 bi->bi_bdev = rdev->bdev;
335 atomic_inc(&mddev->flush_pending);
336 submit_bio(WRITE_BARRIER, bi);
338 rdev_dec_pending(rdev, mddev);
343 static void md_submit_barrier(struct work_struct *ws)
345 mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
346 struct bio *bio = mddev->barrier;
348 atomic_set(&mddev->flush_pending, 1);
350 if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
351 bio_endio(bio, -EOPNOTSUPP);
352 else if (bio->bi_size == 0)
353 /* an empty barrier - all done */
356 bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
357 if (mddev->pers->make_request(mddev, bio))
358 generic_make_request(bio);
359 mddev->barrier = POST_REQUEST_BARRIER;
360 submit_barriers(mddev);
362 if (atomic_dec_and_test(&mddev->flush_pending)) {
363 mddev->barrier = NULL;
364 wake_up(&mddev->sb_wait);
368 void md_barrier_request(mddev_t *mddev, struct bio *bio)
370 spin_lock_irq(&mddev->write_lock);
371 wait_event_lock_irq(mddev->sb_wait,
373 mddev->write_lock, /*nothing*/);
374 mddev->barrier = bio;
375 spin_unlock_irq(&mddev->write_lock);
377 atomic_set(&mddev->flush_pending, 1);
378 INIT_WORK(&mddev->barrier_work, md_submit_barrier);
380 submit_barriers(mddev);
382 if (atomic_dec_and_test(&mddev->flush_pending))
383 schedule_work(&mddev->barrier_work);
385 EXPORT_SYMBOL(md_barrier_request);
387 static inline mddev_t *mddev_get(mddev_t *mddev)
389 atomic_inc(&mddev->active);
393 static void mddev_delayed_delete(struct work_struct *ws);
395 static void mddev_put(mddev_t *mddev)
397 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
399 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
400 mddev->ctime == 0 && !mddev->hold_active) {
401 /* Array is not configured at all, and not held active,
403 list_del(&mddev->all_mddevs);
404 if (mddev->gendisk) {
405 /* we did a probe so need to clean up.
406 * Call schedule_work inside the spinlock
407 * so that flush_scheduled_work() after
408 * mddev_find will succeed in waiting for the
411 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
412 schedule_work(&mddev->del_work);
416 spin_unlock(&all_mddevs_lock);
419 static void mddev_init(mddev_t *mddev)
421 mutex_init(&mddev->open_mutex);
422 mutex_init(&mddev->reconfig_mutex);
423 mutex_init(&mddev->bitmap_info.mutex);
424 INIT_LIST_HEAD(&mddev->disks);
425 INIT_LIST_HEAD(&mddev->all_mddevs);
426 init_timer(&mddev->safemode_timer);
427 atomic_set(&mddev->active, 1);
428 atomic_set(&mddev->openers, 0);
429 atomic_set(&mddev->active_io, 0);
430 spin_lock_init(&mddev->write_lock);
431 atomic_set(&mddev->flush_pending, 0);
432 init_waitqueue_head(&mddev->sb_wait);
433 init_waitqueue_head(&mddev->recovery_wait);
434 mddev->reshape_position = MaxSector;
435 mddev->resync_min = 0;
436 mddev->resync_max = MaxSector;
437 mddev->level = LEVEL_NONE;
440 static mddev_t * mddev_find(dev_t unit)
442 mddev_t *mddev, *new = NULL;
445 spin_lock(&all_mddevs_lock);
448 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
449 if (mddev->unit == unit) {
451 spin_unlock(&all_mddevs_lock);
457 list_add(&new->all_mddevs, &all_mddevs);
458 spin_unlock(&all_mddevs_lock);
459 new->hold_active = UNTIL_IOCTL;
463 /* find an unused unit number */
464 static int next_minor = 512;
465 int start = next_minor;
469 dev = MKDEV(MD_MAJOR, next_minor);
471 if (next_minor > MINORMASK)
473 if (next_minor == start) {
474 /* Oh dear, all in use. */
475 spin_unlock(&all_mddevs_lock);
481 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
482 if (mddev->unit == dev) {
488 new->md_minor = MINOR(dev);
489 new->hold_active = UNTIL_STOP;
490 list_add(&new->all_mddevs, &all_mddevs);
491 spin_unlock(&all_mddevs_lock);
494 spin_unlock(&all_mddevs_lock);
496 new = kzalloc(sizeof(*new), GFP_KERNEL);
501 if (MAJOR(unit) == MD_MAJOR)
502 new->md_minor = MINOR(unit);
504 new->md_minor = MINOR(unit) >> MdpMinorShift;
511 static inline int mddev_lock(mddev_t * mddev)
513 return mutex_lock_interruptible(&mddev->reconfig_mutex);
516 static inline int mddev_is_locked(mddev_t *mddev)
518 return mutex_is_locked(&mddev->reconfig_mutex);
521 static inline int mddev_trylock(mddev_t * mddev)
523 return mutex_trylock(&mddev->reconfig_mutex);
526 static struct attribute_group md_redundancy_group;
528 static void mddev_unlock(mddev_t * mddev)
530 if (mddev->to_remove) {
531 /* These cannot be removed under reconfig_mutex as
532 * an access to the files will try to take reconfig_mutex
533 * while holding the file unremovable, which leads to
535 * So hold set sysfs_active while the remove in happeing,
536 * and anything else which might set ->to_remove or my
537 * otherwise change the sysfs namespace will fail with
538 * -EBUSY if sysfs_active is still set.
539 * We set sysfs_active under reconfig_mutex and elsewhere
540 * test it under the same mutex to ensure its correct value
543 struct attribute_group *to_remove = mddev->to_remove;
544 mddev->to_remove = NULL;
545 mddev->sysfs_active = 1;
546 mutex_unlock(&mddev->reconfig_mutex);
548 if (to_remove != &md_redundancy_group)
549 sysfs_remove_group(&mddev->kobj, to_remove);
550 if (mddev->pers == NULL ||
551 mddev->pers->sync_request == NULL) {
552 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
553 if (mddev->sysfs_action)
554 sysfs_put(mddev->sysfs_action);
555 mddev->sysfs_action = NULL;
557 mddev->sysfs_active = 0;
559 mutex_unlock(&mddev->reconfig_mutex);
561 md_wakeup_thread(mddev->thread);
564 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
568 list_for_each_entry(rdev, &mddev->disks, same_set)
569 if (rdev->desc_nr == nr)
575 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
579 list_for_each_entry(rdev, &mddev->disks, same_set)
580 if (rdev->bdev->bd_dev == dev)
586 static struct mdk_personality *find_pers(int level, char *clevel)
588 struct mdk_personality *pers;
589 list_for_each_entry(pers, &pers_list, list) {
590 if (level != LEVEL_NONE && pers->level == level)
592 if (strcmp(pers->name, clevel)==0)
598 /* return the offset of the super block in 512byte sectors */
599 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
601 sector_t num_sectors = bdev->bd_inode->i_size / 512;
602 return MD_NEW_SIZE_SECTORS(num_sectors);
605 static int alloc_disk_sb(mdk_rdev_t * rdev)
610 rdev->sb_page = alloc_page(GFP_KERNEL);
611 if (!rdev->sb_page) {
612 printk(KERN_ALERT "md: out of memory.\n");
619 static void free_disk_sb(mdk_rdev_t * rdev)
622 put_page(rdev->sb_page);
624 rdev->sb_page = NULL;
631 static void super_written(struct bio *bio, int error)
633 mdk_rdev_t *rdev = bio->bi_private;
634 mddev_t *mddev = rdev->mddev;
636 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
637 printk("md: super_written gets error=%d, uptodate=%d\n",
638 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
639 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
640 md_error(mddev, rdev);
643 if (atomic_dec_and_test(&mddev->pending_writes))
644 wake_up(&mddev->sb_wait);
648 static void super_written_barrier(struct bio *bio, int error)
650 struct bio *bio2 = bio->bi_private;
651 mdk_rdev_t *rdev = bio2->bi_private;
652 mddev_t *mddev = rdev->mddev;
654 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
655 error == -EOPNOTSUPP) {
657 /* barriers don't appear to be supported :-( */
658 set_bit(BarriersNotsupp, &rdev->flags);
659 mddev->barriers_work = 0;
660 spin_lock_irqsave(&mddev->write_lock, flags);
661 bio2->bi_next = mddev->biolist;
662 mddev->biolist = bio2;
663 spin_unlock_irqrestore(&mddev->write_lock, flags);
664 wake_up(&mddev->sb_wait);
668 bio->bi_private = rdev;
669 super_written(bio, error);
673 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
674 sector_t sector, int size, struct page *page)
676 /* write first size bytes of page to sector of rdev
677 * Increment mddev->pending_writes before returning
678 * and decrement it on completion, waking up sb_wait
679 * if zero is reached.
680 * If an error occurred, call md_error
682 * As we might need to resubmit the request if BIO_RW_BARRIER
683 * causes ENOTSUPP, we allocate a spare bio...
685 struct bio *bio = bio_alloc(GFP_NOIO, 1);
686 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
688 bio->bi_bdev = rdev->bdev;
689 bio->bi_sector = sector;
690 bio_add_page(bio, page, size, 0);
691 bio->bi_private = rdev;
692 bio->bi_end_io = super_written;
695 atomic_inc(&mddev->pending_writes);
696 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
698 rw |= (1<<BIO_RW_BARRIER);
699 rbio = bio_clone(bio, GFP_NOIO);
700 rbio->bi_private = bio;
701 rbio->bi_end_io = super_written_barrier;
702 submit_bio(rw, rbio);
707 void md_super_wait(mddev_t *mddev)
709 /* wait for all superblock writes that were scheduled to complete.
710 * if any had to be retried (due to BARRIER problems), retry them
714 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
715 if (atomic_read(&mddev->pending_writes)==0)
717 while (mddev->biolist) {
719 spin_lock_irq(&mddev->write_lock);
720 bio = mddev->biolist;
721 mddev->biolist = bio->bi_next ;
723 spin_unlock_irq(&mddev->write_lock);
724 submit_bio(bio->bi_rw, bio);
728 finish_wait(&mddev->sb_wait, &wq);
731 static void bi_complete(struct bio *bio, int error)
733 complete((struct completion*)bio->bi_private);
736 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
737 struct page *page, int rw)
739 struct bio *bio = bio_alloc(GFP_NOIO, 1);
740 struct completion event;
743 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
746 bio->bi_sector = sector;
747 bio_add_page(bio, page, size, 0);
748 init_completion(&event);
749 bio->bi_private = &event;
750 bio->bi_end_io = bi_complete;
752 wait_for_completion(&event);
754 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
758 EXPORT_SYMBOL_GPL(sync_page_io);
760 static int read_disk_sb(mdk_rdev_t * rdev, int size)
762 char b[BDEVNAME_SIZE];
763 if (!rdev->sb_page) {
771 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
777 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
778 bdevname(rdev->bdev,b));
782 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
784 return sb1->set_uuid0 == sb2->set_uuid0 &&
785 sb1->set_uuid1 == sb2->set_uuid1 &&
786 sb1->set_uuid2 == sb2->set_uuid2 &&
787 sb1->set_uuid3 == sb2->set_uuid3;
790 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
793 mdp_super_t *tmp1, *tmp2;
795 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
796 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
798 if (!tmp1 || !tmp2) {
800 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
808 * nr_disks is not constant
813 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
821 static u32 md_csum_fold(u32 csum)
823 csum = (csum & 0xffff) + (csum >> 16);
824 return (csum & 0xffff) + (csum >> 16);
827 static unsigned int calc_sb_csum(mdp_super_t * sb)
830 u32 *sb32 = (u32*)sb;
832 unsigned int disk_csum, csum;
834 disk_csum = sb->sb_csum;
837 for (i = 0; i < MD_SB_BYTES/4 ; i++)
839 csum = (newcsum & 0xffffffff) + (newcsum>>32);
843 /* This used to use csum_partial, which was wrong for several
844 * reasons including that different results are returned on
845 * different architectures. It isn't critical that we get exactly
846 * the same return value as before (we always csum_fold before
847 * testing, and that removes any differences). However as we
848 * know that csum_partial always returned a 16bit value on
849 * alphas, do a fold to maximise conformity to previous behaviour.
851 sb->sb_csum = md_csum_fold(disk_csum);
853 sb->sb_csum = disk_csum;
860 * Handle superblock details.
861 * We want to be able to handle multiple superblock formats
862 * so we have a common interface to them all, and an array of
863 * different handlers.
864 * We rely on user-space to write the initial superblock, and support
865 * reading and updating of superblocks.
866 * Interface methods are:
867 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
868 * loads and validates a superblock on dev.
869 * if refdev != NULL, compare superblocks on both devices
871 * 0 - dev has a superblock that is compatible with refdev
872 * 1 - dev has a superblock that is compatible and newer than refdev
873 * so dev should be used as the refdev in future
874 * -EINVAL superblock incompatible or invalid
875 * -othererror e.g. -EIO
877 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
878 * Verify that dev is acceptable into mddev.
879 * The first time, mddev->raid_disks will be 0, and data from
880 * dev should be merged in. Subsequent calls check that dev
881 * is new enough. Return 0 or -EINVAL
883 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
884 * Update the superblock for rdev with data in mddev
885 * This does not write to disc.
891 struct module *owner;
892 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
894 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
895 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
896 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
897 sector_t num_sectors);
901 * Check that the given mddev has no bitmap.
903 * This function is called from the run method of all personalities that do not
904 * support bitmaps. It prints an error message and returns non-zero if mddev
905 * has a bitmap. Otherwise, it returns 0.
908 int md_check_no_bitmap(mddev_t *mddev)
910 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
912 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
913 mdname(mddev), mddev->pers->name);
916 EXPORT_SYMBOL(md_check_no_bitmap);
919 * load_super for 0.90.0
921 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
923 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
928 * Calculate the position of the superblock (512byte sectors),
929 * it's at the end of the disk.
931 * It also happens to be a multiple of 4Kb.
933 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
935 ret = read_disk_sb(rdev, MD_SB_BYTES);
940 bdevname(rdev->bdev, b);
941 sb = (mdp_super_t*)page_address(rdev->sb_page);
943 if (sb->md_magic != MD_SB_MAGIC) {
944 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
949 if (sb->major_version != 0 ||
950 sb->minor_version < 90 ||
951 sb->minor_version > 91) {
952 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
953 sb->major_version, sb->minor_version,
958 if (sb->raid_disks <= 0)
961 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
962 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
967 rdev->preferred_minor = sb->md_minor;
968 rdev->data_offset = 0;
969 rdev->sb_size = MD_SB_BYTES;
971 if (sb->level == LEVEL_MULTIPATH)
974 rdev->desc_nr = sb->this_disk.number;
980 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
981 if (!uuid_equal(refsb, sb)) {
982 printk(KERN_WARNING "md: %s has different UUID to %s\n",
983 b, bdevname(refdev->bdev,b2));
986 if (!sb_equal(refsb, sb)) {
987 printk(KERN_WARNING "md: %s has same UUID"
988 " but different superblock to %s\n",
989 b, bdevname(refdev->bdev, b2));
993 ev2 = md_event(refsb);
999 rdev->sectors = rdev->sb_start;
1001 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1002 /* "this cannot possibly happen" ... */
1010 * validate_super for 0.90.0
1012 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1015 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1016 __u64 ev1 = md_event(sb);
1018 rdev->raid_disk = -1;
1019 clear_bit(Faulty, &rdev->flags);
1020 clear_bit(In_sync, &rdev->flags);
1021 clear_bit(WriteMostly, &rdev->flags);
1022 clear_bit(BarriersNotsupp, &rdev->flags);
1024 if (mddev->raid_disks == 0) {
1025 mddev->major_version = 0;
1026 mddev->minor_version = sb->minor_version;
1027 mddev->patch_version = sb->patch_version;
1028 mddev->external = 0;
1029 mddev->chunk_sectors = sb->chunk_size >> 9;
1030 mddev->ctime = sb->ctime;
1031 mddev->utime = sb->utime;
1032 mddev->level = sb->level;
1033 mddev->clevel[0] = 0;
1034 mddev->layout = sb->layout;
1035 mddev->raid_disks = sb->raid_disks;
1036 mddev->dev_sectors = sb->size * 2;
1037 mddev->events = ev1;
1038 mddev->bitmap_info.offset = 0;
1039 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1041 if (mddev->minor_version >= 91) {
1042 mddev->reshape_position = sb->reshape_position;
1043 mddev->delta_disks = sb->delta_disks;
1044 mddev->new_level = sb->new_level;
1045 mddev->new_layout = sb->new_layout;
1046 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1048 mddev->reshape_position = MaxSector;
1049 mddev->delta_disks = 0;
1050 mddev->new_level = mddev->level;
1051 mddev->new_layout = mddev->layout;
1052 mddev->new_chunk_sectors = mddev->chunk_sectors;
1055 if (sb->state & (1<<MD_SB_CLEAN))
1056 mddev->recovery_cp = MaxSector;
1058 if (sb->events_hi == sb->cp_events_hi &&
1059 sb->events_lo == sb->cp_events_lo) {
1060 mddev->recovery_cp = sb->recovery_cp;
1062 mddev->recovery_cp = 0;
1065 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1066 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1067 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1068 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1070 mddev->max_disks = MD_SB_DISKS;
1072 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1073 mddev->bitmap_info.file == NULL)
1074 mddev->bitmap_info.offset =
1075 mddev->bitmap_info.default_offset;
1077 } else if (mddev->pers == NULL) {
1078 /* Insist on good event counter while assembling, except
1079 * for spares (which don't need an event count) */
1081 if (sb->disks[rdev->desc_nr].state & (
1082 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1083 if (ev1 < mddev->events)
1085 } else if (mddev->bitmap) {
1086 /* if adding to array with a bitmap, then we can accept an
1087 * older device ... but not too old.
1089 if (ev1 < mddev->bitmap->events_cleared)
1092 if (ev1 < mddev->events)
1093 /* just a hot-add of a new device, leave raid_disk at -1 */
1097 if (mddev->level != LEVEL_MULTIPATH) {
1098 desc = sb->disks + rdev->desc_nr;
1100 if (desc->state & (1<<MD_DISK_FAULTY))
1101 set_bit(Faulty, &rdev->flags);
1102 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1103 desc->raid_disk < mddev->raid_disks */) {
1104 set_bit(In_sync, &rdev->flags);
1105 rdev->raid_disk = desc->raid_disk;
1106 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1107 /* active but not in sync implies recovery up to
1108 * reshape position. We don't know exactly where
1109 * that is, so set to zero for now */
1110 if (mddev->minor_version >= 91) {
1111 rdev->recovery_offset = 0;
1112 rdev->raid_disk = desc->raid_disk;
1115 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1116 set_bit(WriteMostly, &rdev->flags);
1117 } else /* MULTIPATH are always insync */
1118 set_bit(In_sync, &rdev->flags);
1123 * sync_super for 0.90.0
1125 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1129 int next_spare = mddev->raid_disks;
1132 /* make rdev->sb match mddev data..
1135 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1136 * 3/ any empty disks < next_spare become removed
1138 * disks[0] gets initialised to REMOVED because
1139 * we cannot be sure from other fields if it has
1140 * been initialised or not.
1143 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1145 rdev->sb_size = MD_SB_BYTES;
1147 sb = (mdp_super_t*)page_address(rdev->sb_page);
1149 memset(sb, 0, sizeof(*sb));
1151 sb->md_magic = MD_SB_MAGIC;
1152 sb->major_version = mddev->major_version;
1153 sb->patch_version = mddev->patch_version;
1154 sb->gvalid_words = 0; /* ignored */
1155 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1156 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1157 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1158 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1160 sb->ctime = mddev->ctime;
1161 sb->level = mddev->level;
1162 sb->size = mddev->dev_sectors / 2;
1163 sb->raid_disks = mddev->raid_disks;
1164 sb->md_minor = mddev->md_minor;
1165 sb->not_persistent = 0;
1166 sb->utime = mddev->utime;
1168 sb->events_hi = (mddev->events>>32);
1169 sb->events_lo = (u32)mddev->events;
1171 if (mddev->reshape_position == MaxSector)
1172 sb->minor_version = 90;
1174 sb->minor_version = 91;
1175 sb->reshape_position = mddev->reshape_position;
1176 sb->new_level = mddev->new_level;
1177 sb->delta_disks = mddev->delta_disks;
1178 sb->new_layout = mddev->new_layout;
1179 sb->new_chunk = mddev->new_chunk_sectors << 9;
1181 mddev->minor_version = sb->minor_version;
1184 sb->recovery_cp = mddev->recovery_cp;
1185 sb->cp_events_hi = (mddev->events>>32);
1186 sb->cp_events_lo = (u32)mddev->events;
1187 if (mddev->recovery_cp == MaxSector)
1188 sb->state = (1<< MD_SB_CLEAN);
1190 sb->recovery_cp = 0;
1192 sb->layout = mddev->layout;
1193 sb->chunk_size = mddev->chunk_sectors << 9;
1195 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1196 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1198 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1199 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1202 int is_active = test_bit(In_sync, &rdev2->flags);
1204 if (rdev2->raid_disk >= 0 &&
1205 sb->minor_version >= 91)
1206 /* we have nowhere to store the recovery_offset,
1207 * but if it is not below the reshape_position,
1208 * we can piggy-back on that.
1211 if (rdev2->raid_disk < 0 ||
1212 test_bit(Faulty, &rdev2->flags))
1215 desc_nr = rdev2->raid_disk;
1217 desc_nr = next_spare++;
1218 rdev2->desc_nr = desc_nr;
1219 d = &sb->disks[rdev2->desc_nr];
1221 d->number = rdev2->desc_nr;
1222 d->major = MAJOR(rdev2->bdev->bd_dev);
1223 d->minor = MINOR(rdev2->bdev->bd_dev);
1225 d->raid_disk = rdev2->raid_disk;
1227 d->raid_disk = rdev2->desc_nr; /* compatibility */
1228 if (test_bit(Faulty, &rdev2->flags))
1229 d->state = (1<<MD_DISK_FAULTY);
1230 else if (is_active) {
1231 d->state = (1<<MD_DISK_ACTIVE);
1232 if (test_bit(In_sync, &rdev2->flags))
1233 d->state |= (1<<MD_DISK_SYNC);
1241 if (test_bit(WriteMostly, &rdev2->flags))
1242 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1244 /* now set the "removed" and "faulty" bits on any missing devices */
1245 for (i=0 ; i < mddev->raid_disks ; i++) {
1246 mdp_disk_t *d = &sb->disks[i];
1247 if (d->state == 0 && d->number == 0) {
1250 d->state = (1<<MD_DISK_REMOVED);
1251 d->state |= (1<<MD_DISK_FAULTY);
1255 sb->nr_disks = nr_disks;
1256 sb->active_disks = active;
1257 sb->working_disks = working;
1258 sb->failed_disks = failed;
1259 sb->spare_disks = spare;
1261 sb->this_disk = sb->disks[rdev->desc_nr];
1262 sb->sb_csum = calc_sb_csum(sb);
1266 * rdev_size_change for 0.90.0
1268 static unsigned long long
1269 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1271 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1272 return 0; /* component must fit device */
1273 if (rdev->mddev->bitmap_info.offset)
1274 return 0; /* can't move bitmap */
1275 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1276 if (!num_sectors || num_sectors > rdev->sb_start)
1277 num_sectors = rdev->sb_start;
1278 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1280 md_super_wait(rdev->mddev);
1281 return num_sectors / 2; /* kB for sysfs */
1286 * version 1 superblock
1289 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1293 unsigned long long newcsum;
1294 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1295 __le32 *isuper = (__le32*)sb;
1298 disk_csum = sb->sb_csum;
1301 for (i=0; size>=4; size -= 4 )
1302 newcsum += le32_to_cpu(*isuper++);
1305 newcsum += le16_to_cpu(*(__le16*) isuper);
1307 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1308 sb->sb_csum = disk_csum;
1309 return cpu_to_le32(csum);
1312 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1314 struct mdp_superblock_1 *sb;
1317 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1321 * Calculate the position of the superblock in 512byte sectors.
1322 * It is always aligned to a 4K boundary and
1323 * depeding on minor_version, it can be:
1324 * 0: At least 8K, but less than 12K, from end of device
1325 * 1: At start of device
1326 * 2: 4K from start of device.
1328 switch(minor_version) {
1330 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1332 sb_start &= ~(sector_t)(4*2-1);
1343 rdev->sb_start = sb_start;
1345 /* superblock is rarely larger than 1K, but it can be larger,
1346 * and it is safe to read 4k, so we do that
1348 ret = read_disk_sb(rdev, 4096);
1349 if (ret) return ret;
1352 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1354 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1355 sb->major_version != cpu_to_le32(1) ||
1356 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1357 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1358 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1361 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1362 printk("md: invalid superblock checksum on %s\n",
1363 bdevname(rdev->bdev,b));
1366 if (le64_to_cpu(sb->data_size) < 10) {
1367 printk("md: data_size too small on %s\n",
1368 bdevname(rdev->bdev,b));
1372 rdev->preferred_minor = 0xffff;
1373 rdev->data_offset = le64_to_cpu(sb->data_offset);
1374 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1376 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1377 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1378 if (rdev->sb_size & bmask)
1379 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1382 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1385 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1388 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1394 struct mdp_superblock_1 *refsb =
1395 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1397 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1398 sb->level != refsb->level ||
1399 sb->layout != refsb->layout ||
1400 sb->chunksize != refsb->chunksize) {
1401 printk(KERN_WARNING "md: %s has strangely different"
1402 " superblock to %s\n",
1403 bdevname(rdev->bdev,b),
1404 bdevname(refdev->bdev,b2));
1407 ev1 = le64_to_cpu(sb->events);
1408 ev2 = le64_to_cpu(refsb->events);
1416 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1417 le64_to_cpu(sb->data_offset);
1419 rdev->sectors = rdev->sb_start;
1420 if (rdev->sectors < le64_to_cpu(sb->data_size))
1422 rdev->sectors = le64_to_cpu(sb->data_size);
1423 if (le64_to_cpu(sb->size) > rdev->sectors)
1428 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1430 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1431 __u64 ev1 = le64_to_cpu(sb->events);
1433 rdev->raid_disk = -1;
1434 clear_bit(Faulty, &rdev->flags);
1435 clear_bit(In_sync, &rdev->flags);
1436 clear_bit(WriteMostly, &rdev->flags);
1437 clear_bit(BarriersNotsupp, &rdev->flags);
1439 if (mddev->raid_disks == 0) {
1440 mddev->major_version = 1;
1441 mddev->patch_version = 0;
1442 mddev->external = 0;
1443 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1444 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1445 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1446 mddev->level = le32_to_cpu(sb->level);
1447 mddev->clevel[0] = 0;
1448 mddev->layout = le32_to_cpu(sb->layout);
1449 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1450 mddev->dev_sectors = le64_to_cpu(sb->size);
1451 mddev->events = ev1;
1452 mddev->bitmap_info.offset = 0;
1453 mddev->bitmap_info.default_offset = 1024 >> 9;
1455 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1456 memcpy(mddev->uuid, sb->set_uuid, 16);
1458 mddev->max_disks = (4096-256)/2;
1460 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1461 mddev->bitmap_info.file == NULL )
1462 mddev->bitmap_info.offset =
1463 (__s32)le32_to_cpu(sb->bitmap_offset);
1465 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1466 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1467 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1468 mddev->new_level = le32_to_cpu(sb->new_level);
1469 mddev->new_layout = le32_to_cpu(sb->new_layout);
1470 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1472 mddev->reshape_position = MaxSector;
1473 mddev->delta_disks = 0;
1474 mddev->new_level = mddev->level;
1475 mddev->new_layout = mddev->layout;
1476 mddev->new_chunk_sectors = mddev->chunk_sectors;
1479 } else if (mddev->pers == NULL) {
1480 /* Insist of good event counter while assembling, except for
1481 * spares (which don't need an event count) */
1483 if (rdev->desc_nr >= 0 &&
1484 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1485 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1486 if (ev1 < mddev->events)
1488 } else if (mddev->bitmap) {
1489 /* If adding to array with a bitmap, then we can accept an
1490 * older device, but not too old.
1492 if (ev1 < mddev->bitmap->events_cleared)
1495 if (ev1 < mddev->events)
1496 /* just a hot-add of a new device, leave raid_disk at -1 */
1499 if (mddev->level != LEVEL_MULTIPATH) {
1501 if (rdev->desc_nr < 0 ||
1502 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1506 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1508 case 0xffff: /* spare */
1510 case 0xfffe: /* faulty */
1511 set_bit(Faulty, &rdev->flags);
1514 if ((le32_to_cpu(sb->feature_map) &
1515 MD_FEATURE_RECOVERY_OFFSET))
1516 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1518 set_bit(In_sync, &rdev->flags);
1519 rdev->raid_disk = role;
1522 if (sb->devflags & WriteMostly1)
1523 set_bit(WriteMostly, &rdev->flags);
1524 } else /* MULTIPATH are always insync */
1525 set_bit(In_sync, &rdev->flags);
1530 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1532 struct mdp_superblock_1 *sb;
1535 /* make rdev->sb match mddev and rdev data. */
1537 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1539 sb->feature_map = 0;
1541 sb->recovery_offset = cpu_to_le64(0);
1542 memset(sb->pad1, 0, sizeof(sb->pad1));
1543 memset(sb->pad2, 0, sizeof(sb->pad2));
1544 memset(sb->pad3, 0, sizeof(sb->pad3));
1546 sb->utime = cpu_to_le64((__u64)mddev->utime);
1547 sb->events = cpu_to_le64(mddev->events);
1549 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1551 sb->resync_offset = cpu_to_le64(0);
1553 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1555 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1556 sb->size = cpu_to_le64(mddev->dev_sectors);
1557 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1558 sb->level = cpu_to_le32(mddev->level);
1559 sb->layout = cpu_to_le32(mddev->layout);
1561 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1562 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1563 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1566 if (rdev->raid_disk >= 0 &&
1567 !test_bit(In_sync, &rdev->flags)) {
1569 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1570 sb->recovery_offset =
1571 cpu_to_le64(rdev->recovery_offset);
1574 if (mddev->reshape_position != MaxSector) {
1575 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1576 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1577 sb->new_layout = cpu_to_le32(mddev->new_layout);
1578 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1579 sb->new_level = cpu_to_le32(mddev->new_level);
1580 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1584 list_for_each_entry(rdev2, &mddev->disks, same_set)
1585 if (rdev2->desc_nr+1 > max_dev)
1586 max_dev = rdev2->desc_nr+1;
1588 if (max_dev > le32_to_cpu(sb->max_dev)) {
1590 sb->max_dev = cpu_to_le32(max_dev);
1591 rdev->sb_size = max_dev * 2 + 256;
1592 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1593 if (rdev->sb_size & bmask)
1594 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1596 for (i=0; i<max_dev;i++)
1597 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1599 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1601 if (test_bit(Faulty, &rdev2->flags))
1602 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1603 else if (test_bit(In_sync, &rdev2->flags))
1604 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1605 else if (rdev2->raid_disk >= 0)
1606 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1608 sb->dev_roles[i] = cpu_to_le16(0xffff);
1611 sb->sb_csum = calc_sb_1_csum(sb);
1614 static unsigned long long
1615 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1617 struct mdp_superblock_1 *sb;
1618 sector_t max_sectors;
1619 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1620 return 0; /* component must fit device */
1621 if (rdev->sb_start < rdev->data_offset) {
1622 /* minor versions 1 and 2; superblock before data */
1623 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1624 max_sectors -= rdev->data_offset;
1625 if (!num_sectors || num_sectors > max_sectors)
1626 num_sectors = max_sectors;
1627 } else if (rdev->mddev->bitmap_info.offset) {
1628 /* minor version 0 with bitmap we can't move */
1631 /* minor version 0; superblock after data */
1633 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1634 sb_start &= ~(sector_t)(4*2 - 1);
1635 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1636 if (!num_sectors || num_sectors > max_sectors)
1637 num_sectors = max_sectors;
1638 rdev->sb_start = sb_start;
1640 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1641 sb->data_size = cpu_to_le64(num_sectors);
1642 sb->super_offset = rdev->sb_start;
1643 sb->sb_csum = calc_sb_1_csum(sb);
1644 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1646 md_super_wait(rdev->mddev);
1647 return num_sectors / 2; /* kB for sysfs */
1650 static struct super_type super_types[] = {
1653 .owner = THIS_MODULE,
1654 .load_super = super_90_load,
1655 .validate_super = super_90_validate,
1656 .sync_super = super_90_sync,
1657 .rdev_size_change = super_90_rdev_size_change,
1661 .owner = THIS_MODULE,
1662 .load_super = super_1_load,
1663 .validate_super = super_1_validate,
1664 .sync_super = super_1_sync,
1665 .rdev_size_change = super_1_rdev_size_change,
1669 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1671 mdk_rdev_t *rdev, *rdev2;
1674 rdev_for_each_rcu(rdev, mddev1)
1675 rdev_for_each_rcu(rdev2, mddev2)
1676 if (rdev->bdev->bd_contains ==
1677 rdev2->bdev->bd_contains) {
1685 static LIST_HEAD(pending_raid_disks);
1688 * Try to register data integrity profile for an mddev
1690 * This is called when an array is started and after a disk has been kicked
1691 * from the array. It only succeeds if all working and active component devices
1692 * are integrity capable with matching profiles.
1694 int md_integrity_register(mddev_t *mddev)
1696 mdk_rdev_t *rdev, *reference = NULL;
1698 if (list_empty(&mddev->disks))
1699 return 0; /* nothing to do */
1700 if (blk_get_integrity(mddev->gendisk))
1701 return 0; /* already registered */
1702 list_for_each_entry(rdev, &mddev->disks, same_set) {
1703 /* skip spares and non-functional disks */
1704 if (test_bit(Faulty, &rdev->flags))
1706 if (rdev->raid_disk < 0)
1709 * If at least one rdev is not integrity capable, we can not
1710 * enable data integrity for the md device.
1712 if (!bdev_get_integrity(rdev->bdev))
1715 /* Use the first rdev as the reference */
1719 /* does this rdev's profile match the reference profile? */
1720 if (blk_integrity_compare(reference->bdev->bd_disk,
1721 rdev->bdev->bd_disk) < 0)
1725 * All component devices are integrity capable and have matching
1726 * profiles, register the common profile for the md device.
1728 if (blk_integrity_register(mddev->gendisk,
1729 bdev_get_integrity(reference->bdev)) != 0) {
1730 printk(KERN_ERR "md: failed to register integrity for %s\n",
1734 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1738 EXPORT_SYMBOL(md_integrity_register);
1740 /* Disable data integrity if non-capable/non-matching disk is being added */
1741 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1743 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1744 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1746 if (!bi_mddev) /* nothing to do */
1748 if (rdev->raid_disk < 0) /* skip spares */
1750 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1751 rdev->bdev->bd_disk) >= 0)
1753 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1754 blk_integrity_unregister(mddev->gendisk);
1756 EXPORT_SYMBOL(md_integrity_add_rdev);
1758 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1760 char b[BDEVNAME_SIZE];
1770 /* prevent duplicates */
1771 if (find_rdev(mddev, rdev->bdev->bd_dev))
1774 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1775 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1776 rdev->sectors < mddev->dev_sectors)) {
1778 /* Cannot change size, so fail
1779 * If mddev->level <= 0, then we don't care
1780 * about aligning sizes (e.g. linear)
1782 if (mddev->level > 0)
1785 mddev->dev_sectors = rdev->sectors;
1788 /* Verify rdev->desc_nr is unique.
1789 * If it is -1, assign a free number, else
1790 * check number is not in use
1792 if (rdev->desc_nr < 0) {
1794 if (mddev->pers) choice = mddev->raid_disks;
1795 while (find_rdev_nr(mddev, choice))
1797 rdev->desc_nr = choice;
1799 if (find_rdev_nr(mddev, rdev->desc_nr))
1802 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1803 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1804 mdname(mddev), mddev->max_disks);
1807 bdevname(rdev->bdev,b);
1808 while ( (s=strchr(b, '/')) != NULL)
1811 rdev->mddev = mddev;
1812 printk(KERN_INFO "md: bind<%s>\n", b);
1814 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1817 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1818 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1819 kobject_del(&rdev->kobj);
1822 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, NULL, "state");
1824 list_add_rcu(&rdev->same_set, &mddev->disks);
1825 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1827 /* May as well allow recovery to be retried once */
1828 mddev->recovery_disabled = 0;
1833 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1838 static void md_delayed_delete(struct work_struct *ws)
1840 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1841 kobject_del(&rdev->kobj);
1842 kobject_put(&rdev->kobj);
1845 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1847 char b[BDEVNAME_SIZE];
1852 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1853 list_del_rcu(&rdev->same_set);
1854 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1856 sysfs_remove_link(&rdev->kobj, "block");
1857 sysfs_put(rdev->sysfs_state);
1858 rdev->sysfs_state = NULL;
1859 /* We need to delay this, otherwise we can deadlock when
1860 * writing to 'remove' to "dev/state". We also need
1861 * to delay it due to rcu usage.
1864 INIT_WORK(&rdev->del_work, md_delayed_delete);
1865 kobject_get(&rdev->kobj);
1866 schedule_work(&rdev->del_work);
1870 * prevent the device from being mounted, repartitioned or
1871 * otherwise reused by a RAID array (or any other kernel
1872 * subsystem), by bd_claiming the device.
1874 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1877 struct block_device *bdev;
1878 char b[BDEVNAME_SIZE];
1880 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1882 printk(KERN_ERR "md: could not open %s.\n",
1883 __bdevname(dev, b));
1884 return PTR_ERR(bdev);
1886 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1888 printk(KERN_ERR "md: could not bd_claim %s.\n",
1890 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1894 set_bit(AllReserved, &rdev->flags);
1899 static void unlock_rdev(mdk_rdev_t *rdev)
1901 struct block_device *bdev = rdev->bdev;
1906 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1909 void md_autodetect_dev(dev_t dev);
1911 static void export_rdev(mdk_rdev_t * rdev)
1913 char b[BDEVNAME_SIZE];
1914 printk(KERN_INFO "md: export_rdev(%s)\n",
1915 bdevname(rdev->bdev,b));
1920 if (test_bit(AutoDetected, &rdev->flags))
1921 md_autodetect_dev(rdev->bdev->bd_dev);
1924 kobject_put(&rdev->kobj);
1927 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1929 unbind_rdev_from_array(rdev);
1933 static void export_array(mddev_t *mddev)
1935 mdk_rdev_t *rdev, *tmp;
1937 rdev_for_each(rdev, tmp, mddev) {
1942 kick_rdev_from_array(rdev);
1944 if (!list_empty(&mddev->disks))
1946 mddev->raid_disks = 0;
1947 mddev->major_version = 0;
1950 static void print_desc(mdp_disk_t *desc)
1952 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1953 desc->major,desc->minor,desc->raid_disk,desc->state);
1956 static void print_sb_90(mdp_super_t *sb)
1961 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1962 sb->major_version, sb->minor_version, sb->patch_version,
1963 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1965 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1966 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1967 sb->md_minor, sb->layout, sb->chunk_size);
1968 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1969 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1970 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1971 sb->failed_disks, sb->spare_disks,
1972 sb->sb_csum, (unsigned long)sb->events_lo);
1975 for (i = 0; i < MD_SB_DISKS; i++) {
1978 desc = sb->disks + i;
1979 if (desc->number || desc->major || desc->minor ||
1980 desc->raid_disk || (desc->state && (desc->state != 4))) {
1981 printk(" D %2d: ", i);
1985 printk(KERN_INFO "md: THIS: ");
1986 print_desc(&sb->this_disk);
1989 static void print_sb_1(struct mdp_superblock_1 *sb)
1993 uuid = sb->set_uuid;
1995 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1996 "md: Name: \"%s\" CT:%llu\n",
1997 le32_to_cpu(sb->major_version),
1998 le32_to_cpu(sb->feature_map),
2001 (unsigned long long)le64_to_cpu(sb->ctime)
2002 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2004 uuid = sb->device_uuid;
2006 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2008 "md: Dev:%08x UUID: %pU\n"
2009 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2010 "md: (MaxDev:%u) \n",
2011 le32_to_cpu(sb->level),
2012 (unsigned long long)le64_to_cpu(sb->size),
2013 le32_to_cpu(sb->raid_disks),
2014 le32_to_cpu(sb->layout),
2015 le32_to_cpu(sb->chunksize),
2016 (unsigned long long)le64_to_cpu(sb->data_offset),
2017 (unsigned long long)le64_to_cpu(sb->data_size),
2018 (unsigned long long)le64_to_cpu(sb->super_offset),
2019 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2020 le32_to_cpu(sb->dev_number),
2023 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2024 (unsigned long long)le64_to_cpu(sb->events),
2025 (unsigned long long)le64_to_cpu(sb->resync_offset),
2026 le32_to_cpu(sb->sb_csum),
2027 le32_to_cpu(sb->max_dev)
2031 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2033 char b[BDEVNAME_SIZE];
2034 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2035 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2036 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2038 if (rdev->sb_loaded) {
2039 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2040 switch (major_version) {
2042 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2045 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2049 printk(KERN_INFO "md: no rdev superblock!\n");
2052 static void md_print_devices(void)
2054 struct list_head *tmp;
2057 char b[BDEVNAME_SIZE];
2060 printk("md: **********************************\n");
2061 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2062 printk("md: **********************************\n");
2063 for_each_mddev(mddev, tmp) {
2066 bitmap_print_sb(mddev->bitmap);
2068 printk("%s: ", mdname(mddev));
2069 list_for_each_entry(rdev, &mddev->disks, same_set)
2070 printk("<%s>", bdevname(rdev->bdev,b));
2073 list_for_each_entry(rdev, &mddev->disks, same_set)
2074 print_rdev(rdev, mddev->major_version);
2076 printk("md: **********************************\n");
2081 static void sync_sbs(mddev_t * mddev, int nospares)
2083 /* Update each superblock (in-memory image), but
2084 * if we are allowed to, skip spares which already
2085 * have the right event counter, or have one earlier
2086 * (which would mean they aren't being marked as dirty
2087 * with the rest of the array)
2091 /* First make sure individual recovery_offsets are correct */
2092 list_for_each_entry(rdev, &mddev->disks, same_set) {
2093 if (rdev->raid_disk >= 0 &&
2094 mddev->delta_disks >= 0 &&
2095 !test_bit(In_sync, &rdev->flags) &&
2096 mddev->curr_resync_completed > rdev->recovery_offset)
2097 rdev->recovery_offset = mddev->curr_resync_completed;
2100 list_for_each_entry(rdev, &mddev->disks, same_set) {
2101 if (rdev->sb_events == mddev->events ||
2103 rdev->raid_disk < 0 &&
2104 rdev->sb_events+1 == mddev->events)) {
2105 /* Don't update this superblock */
2106 rdev->sb_loaded = 2;
2108 super_types[mddev->major_version].
2109 sync_super(mddev, rdev);
2110 rdev->sb_loaded = 1;
2115 static void md_update_sb(mddev_t * mddev, int force_change)
2121 mddev->utime = get_seconds();
2122 if (mddev->external)
2125 spin_lock_irq(&mddev->write_lock);
2127 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2128 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2130 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2131 /* just a clean<-> dirty transition, possibly leave spares alone,
2132 * though if events isn't the right even/odd, we will have to do
2138 if (mddev->degraded)
2139 /* If the array is degraded, then skipping spares is both
2140 * dangerous and fairly pointless.
2141 * Dangerous because a device that was removed from the array
2142 * might have a event_count that still looks up-to-date,
2143 * so it can be re-added without a resync.
2144 * Pointless because if there are any spares to skip,
2145 * then a recovery will happen and soon that array won't
2146 * be degraded any more and the spare can go back to sleep then.
2150 sync_req = mddev->in_sync;
2152 /* If this is just a dirty<->clean transition, and the array is clean
2153 * and 'events' is odd, we can roll back to the previous clean state */
2155 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2156 && mddev->can_decrease_events
2157 && mddev->events != 1) {
2159 mddev->can_decrease_events = 0;
2161 /* otherwise we have to go forward and ... */
2163 mddev->can_decrease_events = nospares;
2166 if (!mddev->events) {
2168 * oops, this 64-bit counter should never wrap.
2169 * Either we are in around ~1 trillion A.C., assuming
2170 * 1 reboot per second, or we have a bug:
2177 * do not write anything to disk if using
2178 * nonpersistent superblocks
2180 if (!mddev->persistent) {
2181 if (!mddev->external)
2182 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2184 spin_unlock_irq(&mddev->write_lock);
2185 wake_up(&mddev->sb_wait);
2188 sync_sbs(mddev, nospares);
2189 spin_unlock_irq(&mddev->write_lock);
2192 "md: updating %s RAID superblock on device (in sync %d)\n",
2193 mdname(mddev),mddev->in_sync);
2195 bitmap_update_sb(mddev->bitmap);
2196 list_for_each_entry(rdev, &mddev->disks, same_set) {
2197 char b[BDEVNAME_SIZE];
2198 dprintk(KERN_INFO "md: ");
2199 if (rdev->sb_loaded != 1)
2200 continue; /* no noise on spare devices */
2201 if (test_bit(Faulty, &rdev->flags))
2202 dprintk("(skipping faulty ");
2204 dprintk("%s ", bdevname(rdev->bdev,b));
2205 if (!test_bit(Faulty, &rdev->flags)) {
2206 md_super_write(mddev,rdev,
2207 rdev->sb_start, rdev->sb_size,
2209 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2210 bdevname(rdev->bdev,b),
2211 (unsigned long long)rdev->sb_start);
2212 rdev->sb_events = mddev->events;
2216 if (mddev->level == LEVEL_MULTIPATH)
2217 /* only need to write one superblock... */
2220 md_super_wait(mddev);
2221 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2223 spin_lock_irq(&mddev->write_lock);
2224 if (mddev->in_sync != sync_req ||
2225 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2226 /* have to write it out again */
2227 spin_unlock_irq(&mddev->write_lock);
2230 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2231 spin_unlock_irq(&mddev->write_lock);
2232 wake_up(&mddev->sb_wait);
2233 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2234 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2238 /* words written to sysfs files may, or may not, be \n terminated.
2239 * We want to accept with case. For this we use cmd_match.
2241 static int cmd_match(const char *cmd, const char *str)
2243 /* See if cmd, written into a sysfs file, matches
2244 * str. They must either be the same, or cmd can
2245 * have a trailing newline
2247 while (*cmd && *str && *cmd == *str) {
2258 struct rdev_sysfs_entry {
2259 struct attribute attr;
2260 ssize_t (*show)(mdk_rdev_t *, char *);
2261 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2265 state_show(mdk_rdev_t *rdev, char *page)
2270 if (test_bit(Faulty, &rdev->flags)) {
2271 len+= sprintf(page+len, "%sfaulty",sep);
2274 if (test_bit(In_sync, &rdev->flags)) {
2275 len += sprintf(page+len, "%sin_sync",sep);
2278 if (test_bit(WriteMostly, &rdev->flags)) {
2279 len += sprintf(page+len, "%swrite_mostly",sep);
2282 if (test_bit(Blocked, &rdev->flags)) {
2283 len += sprintf(page+len, "%sblocked", sep);
2286 if (!test_bit(Faulty, &rdev->flags) &&
2287 !test_bit(In_sync, &rdev->flags)) {
2288 len += sprintf(page+len, "%sspare", sep);
2291 return len+sprintf(page+len, "\n");
2295 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2298 * faulty - simulates and error
2299 * remove - disconnects the device
2300 * writemostly - sets write_mostly
2301 * -writemostly - clears write_mostly
2302 * blocked - sets the Blocked flag
2303 * -blocked - clears the Blocked flag
2304 * insync - sets Insync providing device isn't active
2307 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2308 md_error(rdev->mddev, rdev);
2310 } else if (cmd_match(buf, "remove")) {
2311 if (rdev->raid_disk >= 0)
2314 mddev_t *mddev = rdev->mddev;
2315 kick_rdev_from_array(rdev);
2317 md_update_sb(mddev, 1);
2318 md_new_event(mddev);
2321 } else if (cmd_match(buf, "writemostly")) {
2322 set_bit(WriteMostly, &rdev->flags);
2324 } else if (cmd_match(buf, "-writemostly")) {
2325 clear_bit(WriteMostly, &rdev->flags);
2327 } else if (cmd_match(buf, "blocked")) {
2328 set_bit(Blocked, &rdev->flags);
2330 } else if (cmd_match(buf, "-blocked")) {
2331 clear_bit(Blocked, &rdev->flags);
2332 wake_up(&rdev->blocked_wait);
2333 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2334 md_wakeup_thread(rdev->mddev->thread);
2337 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2338 set_bit(In_sync, &rdev->flags);
2341 if (!err && rdev->sysfs_state)
2342 sysfs_notify_dirent(rdev->sysfs_state);
2343 return err ? err : len;
2345 static struct rdev_sysfs_entry rdev_state =
2346 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2349 errors_show(mdk_rdev_t *rdev, char *page)
2351 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2355 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2358 unsigned long n = simple_strtoul(buf, &e, 10);
2359 if (*buf && (*e == 0 || *e == '\n')) {
2360 atomic_set(&rdev->corrected_errors, n);
2365 static struct rdev_sysfs_entry rdev_errors =
2366 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2369 slot_show(mdk_rdev_t *rdev, char *page)
2371 if (rdev->raid_disk < 0)
2372 return sprintf(page, "none\n");
2374 return sprintf(page, "%d\n", rdev->raid_disk);
2378 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2383 int slot = simple_strtoul(buf, &e, 10);
2384 if (strncmp(buf, "none", 4)==0)
2386 else if (e==buf || (*e && *e!= '\n'))
2388 if (rdev->mddev->pers && slot == -1) {
2389 /* Setting 'slot' on an active array requires also
2390 * updating the 'rd%d' link, and communicating
2391 * with the personality with ->hot_*_disk.
2392 * For now we only support removing
2393 * failed/spare devices. This normally happens automatically,
2394 * but not when the metadata is externally managed.
2396 if (rdev->raid_disk == -1)
2398 /* personality does all needed checks */
2399 if (rdev->mddev->pers->hot_add_disk == NULL)
2401 err = rdev->mddev->pers->
2402 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2405 sprintf(nm, "rd%d", rdev->raid_disk);
2406 sysfs_remove_link(&rdev->mddev->kobj, nm);
2407 rdev->raid_disk = -1;
2408 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2409 md_wakeup_thread(rdev->mddev->thread);
2410 } else if (rdev->mddev->pers) {
2412 /* Activating a spare .. or possibly reactivating
2413 * if we ever get bitmaps working here.
2416 if (rdev->raid_disk != -1)
2419 if (rdev->mddev->pers->hot_add_disk == NULL)
2422 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2423 if (rdev2->raid_disk == slot)
2426 rdev->raid_disk = slot;
2427 if (test_bit(In_sync, &rdev->flags))
2428 rdev->saved_raid_disk = slot;
2430 rdev->saved_raid_disk = -1;
2431 err = rdev->mddev->pers->
2432 hot_add_disk(rdev->mddev, rdev);
2434 rdev->raid_disk = -1;
2437 sysfs_notify_dirent(rdev->sysfs_state);
2438 sprintf(nm, "rd%d", rdev->raid_disk);
2439 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2441 "md: cannot register "
2443 nm, mdname(rdev->mddev));
2445 /* don't wakeup anyone, leave that to userspace. */
2447 if (slot >= rdev->mddev->raid_disks)
2449 rdev->raid_disk = slot;
2450 /* assume it is working */
2451 clear_bit(Faulty, &rdev->flags);
2452 clear_bit(WriteMostly, &rdev->flags);
2453 set_bit(In_sync, &rdev->flags);
2454 sysfs_notify_dirent(rdev->sysfs_state);
2460 static struct rdev_sysfs_entry rdev_slot =
2461 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2464 offset_show(mdk_rdev_t *rdev, char *page)
2466 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2470 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2473 unsigned long long offset = simple_strtoull(buf, &e, 10);
2474 if (e==buf || (*e && *e != '\n'))
2476 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2478 if (rdev->sectors && rdev->mddev->external)
2479 /* Must set offset before size, so overlap checks
2482 rdev->data_offset = offset;
2486 static struct rdev_sysfs_entry rdev_offset =
2487 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2490 rdev_size_show(mdk_rdev_t *rdev, char *page)
2492 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2495 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2497 /* check if two start/length pairs overlap */
2505 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2507 unsigned long long blocks;
2510 if (strict_strtoull(buf, 10, &blocks) < 0)
2513 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2514 return -EINVAL; /* sector conversion overflow */
2517 if (new != blocks * 2)
2518 return -EINVAL; /* unsigned long long to sector_t overflow */
2525 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2527 mddev_t *my_mddev = rdev->mddev;
2528 sector_t oldsectors = rdev->sectors;
2531 if (strict_blocks_to_sectors(buf, §ors) < 0)
2533 if (my_mddev->pers && rdev->raid_disk >= 0) {
2534 if (my_mddev->persistent) {
2535 sectors = super_types[my_mddev->major_version].
2536 rdev_size_change(rdev, sectors);
2539 } else if (!sectors)
2540 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2543 if (sectors < my_mddev->dev_sectors)
2544 return -EINVAL; /* component must fit device */
2546 rdev->sectors = sectors;
2547 if (sectors > oldsectors && my_mddev->external) {
2548 /* need to check that all other rdevs with the same ->bdev
2549 * do not overlap. We need to unlock the mddev to avoid
2550 * a deadlock. We have already changed rdev->sectors, and if
2551 * we have to change it back, we will have the lock again.
2555 struct list_head *tmp;
2557 mddev_unlock(my_mddev);
2558 for_each_mddev(mddev, tmp) {
2562 list_for_each_entry(rdev2, &mddev->disks, same_set)
2563 if (test_bit(AllReserved, &rdev2->flags) ||
2564 (rdev->bdev == rdev2->bdev &&
2566 overlaps(rdev->data_offset, rdev->sectors,
2572 mddev_unlock(mddev);
2578 mddev_lock(my_mddev);
2580 /* Someone else could have slipped in a size
2581 * change here, but doing so is just silly.
2582 * We put oldsectors back because we *know* it is
2583 * safe, and trust userspace not to race with
2586 rdev->sectors = oldsectors;
2593 static struct rdev_sysfs_entry rdev_size =
2594 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2597 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2599 unsigned long long recovery_start = rdev->recovery_offset;
2601 if (test_bit(In_sync, &rdev->flags) ||
2602 recovery_start == MaxSector)
2603 return sprintf(page, "none\n");
2605 return sprintf(page, "%llu\n", recovery_start);
2608 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2610 unsigned long long recovery_start;
2612 if (cmd_match(buf, "none"))
2613 recovery_start = MaxSector;
2614 else if (strict_strtoull(buf, 10, &recovery_start))
2617 if (rdev->mddev->pers &&
2618 rdev->raid_disk >= 0)
2621 rdev->recovery_offset = recovery_start;
2622 if (recovery_start == MaxSector)
2623 set_bit(In_sync, &rdev->flags);
2625 clear_bit(In_sync, &rdev->flags);
2629 static struct rdev_sysfs_entry rdev_recovery_start =
2630 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2632 static struct attribute *rdev_default_attrs[] = {
2638 &rdev_recovery_start.attr,
2642 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2644 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2645 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2646 mddev_t *mddev = rdev->mddev;
2652 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2654 if (rdev->mddev == NULL)
2657 rv = entry->show(rdev, page);
2658 mddev_unlock(mddev);
2664 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2665 const char *page, size_t length)
2667 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2668 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2670 mddev_t *mddev = rdev->mddev;
2674 if (!capable(CAP_SYS_ADMIN))
2676 rv = mddev ? mddev_lock(mddev): -EBUSY;
2678 if (rdev->mddev == NULL)
2681 rv = entry->store(rdev, page, length);
2682 mddev_unlock(mddev);
2687 static void rdev_free(struct kobject *ko)
2689 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2692 static const struct sysfs_ops rdev_sysfs_ops = {
2693 .show = rdev_attr_show,
2694 .store = rdev_attr_store,
2696 static struct kobj_type rdev_ktype = {
2697 .release = rdev_free,
2698 .sysfs_ops = &rdev_sysfs_ops,
2699 .default_attrs = rdev_default_attrs,
2703 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2705 * mark the device faulty if:
2707 * - the device is nonexistent (zero size)
2708 * - the device has no valid superblock
2710 * a faulty rdev _never_ has rdev->sb set.
2712 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2714 char b[BDEVNAME_SIZE];
2719 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2721 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2722 return ERR_PTR(-ENOMEM);
2725 if ((err = alloc_disk_sb(rdev)))
2728 err = lock_rdev(rdev, newdev, super_format == -2);
2732 kobject_init(&rdev->kobj, &rdev_ktype);
2735 rdev->saved_raid_disk = -1;
2736 rdev->raid_disk = -1;
2738 rdev->data_offset = 0;
2739 rdev->sb_events = 0;
2740 rdev->last_read_error.tv_sec = 0;
2741 rdev->last_read_error.tv_nsec = 0;
2742 atomic_set(&rdev->nr_pending, 0);
2743 atomic_set(&rdev->read_errors, 0);
2744 atomic_set(&rdev->corrected_errors, 0);
2746 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2749 "md: %s has zero or unknown size, marking faulty!\n",
2750 bdevname(rdev->bdev,b));
2755 if (super_format >= 0) {
2756 err = super_types[super_format].
2757 load_super(rdev, NULL, super_minor);
2758 if (err == -EINVAL) {
2760 "md: %s does not have a valid v%d.%d "
2761 "superblock, not importing!\n",
2762 bdevname(rdev->bdev,b),
2763 super_format, super_minor);
2768 "md: could not read %s's sb, not importing!\n",
2769 bdevname(rdev->bdev,b));
2774 INIT_LIST_HEAD(&rdev->same_set);
2775 init_waitqueue_head(&rdev->blocked_wait);
2780 if (rdev->sb_page) {
2786 return ERR_PTR(err);
2790 * Check a full RAID array for plausibility
2794 static void analyze_sbs(mddev_t * mddev)
2797 mdk_rdev_t *rdev, *freshest, *tmp;
2798 char b[BDEVNAME_SIZE];
2801 rdev_for_each(rdev, tmp, mddev)
2802 switch (super_types[mddev->major_version].
2803 load_super(rdev, freshest, mddev->minor_version)) {
2811 "md: fatal superblock inconsistency in %s"
2812 " -- removing from array\n",
2813 bdevname(rdev->bdev,b));
2814 kick_rdev_from_array(rdev);
2818 super_types[mddev->major_version].
2819 validate_super(mddev, freshest);
2822 rdev_for_each(rdev, tmp, mddev) {
2823 if (mddev->max_disks &&
2824 (rdev->desc_nr >= mddev->max_disks ||
2825 i > mddev->max_disks)) {
2827 "md: %s: %s: only %d devices permitted\n",
2828 mdname(mddev), bdevname(rdev->bdev, b),
2830 kick_rdev_from_array(rdev);
2833 if (rdev != freshest)
2834 if (super_types[mddev->major_version].
2835 validate_super(mddev, rdev)) {
2836 printk(KERN_WARNING "md: kicking non-fresh %s"
2838 bdevname(rdev->bdev,b));
2839 kick_rdev_from_array(rdev);
2842 if (mddev->level == LEVEL_MULTIPATH) {
2843 rdev->desc_nr = i++;
2844 rdev->raid_disk = rdev->desc_nr;
2845 set_bit(In_sync, &rdev->flags);
2846 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2847 rdev->raid_disk = -1;
2848 clear_bit(In_sync, &rdev->flags);
2853 /* Read a fixed-point number.
2854 * Numbers in sysfs attributes should be in "standard" units where
2855 * possible, so time should be in seconds.
2856 * However we internally use a a much smaller unit such as
2857 * milliseconds or jiffies.
2858 * This function takes a decimal number with a possible fractional
2859 * component, and produces an integer which is the result of
2860 * multiplying that number by 10^'scale'.
2861 * all without any floating-point arithmetic.
2863 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2865 unsigned long result = 0;
2867 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2870 else if (decimals < scale) {
2873 result = result * 10 + value;
2885 while (decimals < scale) {
2894 static void md_safemode_timeout(unsigned long data);
2897 safe_delay_show(mddev_t *mddev, char *page)
2899 int msec = (mddev->safemode_delay*1000)/HZ;
2900 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2903 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2907 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2910 mddev->safemode_delay = 0;
2912 unsigned long old_delay = mddev->safemode_delay;
2913 mddev->safemode_delay = (msec*HZ)/1000;
2914 if (mddev->safemode_delay == 0)
2915 mddev->safemode_delay = 1;
2916 if (mddev->safemode_delay < old_delay)
2917 md_safemode_timeout((unsigned long)mddev);
2921 static struct md_sysfs_entry md_safe_delay =
2922 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2925 level_show(mddev_t *mddev, char *page)
2927 struct mdk_personality *p = mddev->pers;
2929 return sprintf(page, "%s\n", p->name);
2930 else if (mddev->clevel[0])
2931 return sprintf(page, "%s\n", mddev->clevel);
2932 else if (mddev->level != LEVEL_NONE)
2933 return sprintf(page, "%d\n", mddev->level);
2939 level_store(mddev_t *mddev, const char *buf, size_t len)
2943 struct mdk_personality *pers;
2948 if (mddev->pers == NULL) {
2951 if (len >= sizeof(mddev->clevel))
2953 strncpy(mddev->clevel, buf, len);
2954 if (mddev->clevel[len-1] == '\n')
2956 mddev->clevel[len] = 0;
2957 mddev->level = LEVEL_NONE;
2961 /* request to change the personality. Need to ensure:
2962 * - array is not engaged in resync/recovery/reshape
2963 * - old personality can be suspended
2964 * - new personality will access other array.
2967 if (mddev->sync_thread ||
2968 mddev->reshape_position != MaxSector ||
2969 mddev->sysfs_active)
2972 if (!mddev->pers->quiesce) {
2973 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2974 mdname(mddev), mddev->pers->name);
2978 /* Now find the new personality */
2979 if (len == 0 || len >= sizeof(clevel))
2981 strncpy(clevel, buf, len);
2982 if (clevel[len-1] == '\n')
2985 if (strict_strtol(clevel, 10, &level))
2988 if (request_module("md-%s", clevel) != 0)
2989 request_module("md-level-%s", clevel);
2990 spin_lock(&pers_lock);
2991 pers = find_pers(level, clevel);
2992 if (!pers || !try_module_get(pers->owner)) {
2993 spin_unlock(&pers_lock);
2994 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
2997 spin_unlock(&pers_lock);
2999 if (pers == mddev->pers) {
3000 /* Nothing to do! */
3001 module_put(pers->owner);
3004 if (!pers->takeover) {
3005 module_put(pers->owner);
3006 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3007 mdname(mddev), clevel);
3011 list_for_each_entry(rdev, &mddev->disks, same_set)
3012 rdev->new_raid_disk = rdev->raid_disk;
3014 /* ->takeover must set new_* and/or delta_disks
3015 * if it succeeds, and may set them when it fails.
3017 priv = pers->takeover(mddev);
3019 mddev->new_level = mddev->level;
3020 mddev->new_layout = mddev->layout;
3021 mddev->new_chunk_sectors = mddev->chunk_sectors;
3022 mddev->raid_disks -= mddev->delta_disks;
3023 mddev->delta_disks = 0;
3024 module_put(pers->owner);
3025 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3026 mdname(mddev), clevel);
3027 return PTR_ERR(priv);
3030 /* Looks like we have a winner */
3031 mddev_suspend(mddev);
3032 mddev->pers->stop(mddev);
3034 if (mddev->pers->sync_request == NULL &&
3035 pers->sync_request != NULL) {
3036 /* need to add the md_redundancy_group */
3037 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3039 "md: cannot register extra attributes for %s\n",
3041 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3043 if (mddev->pers->sync_request != NULL &&
3044 pers->sync_request == NULL) {
3045 /* need to remove the md_redundancy_group */
3046 if (mddev->to_remove == NULL)
3047 mddev->to_remove = &md_redundancy_group;
3050 if (mddev->pers->sync_request == NULL &&
3052 /* We are converting from a no-redundancy array
3053 * to a redundancy array and metadata is managed
3054 * externally so we need to be sure that writes
3055 * won't block due to a need to transition
3057 * until external management is started.
3060 mddev->safemode_delay = 0;
3061 mddev->safemode = 0;
3064 list_for_each_entry(rdev, &mddev->disks, same_set) {
3066 if (rdev->raid_disk < 0)
3068 if (rdev->new_raid_disk > mddev->raid_disks)
3069 rdev->new_raid_disk = -1;
3070 if (rdev->new_raid_disk == rdev->raid_disk)
3072 sprintf(nm, "rd%d", rdev->raid_disk);
3073 sysfs_remove_link(&mddev->kobj, nm);
3075 list_for_each_entry(rdev, &mddev->disks, same_set) {
3076 if (rdev->raid_disk < 0)
3078 if (rdev->new_raid_disk == rdev->raid_disk)
3080 rdev->raid_disk = rdev->new_raid_disk;
3081 if (rdev->raid_disk < 0)
3082 clear_bit(In_sync, &rdev->flags);
3085 sprintf(nm, "rd%d", rdev->raid_disk);
3086 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3087 printk("md: cannot register %s for %s after level change\n",
3092 module_put(mddev->pers->owner);
3094 mddev->private = priv;
3095 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3096 mddev->level = mddev->new_level;
3097 mddev->layout = mddev->new_layout;
3098 mddev->chunk_sectors = mddev->new_chunk_sectors;
3099 mddev->delta_disks = 0;
3100 if (mddev->pers->sync_request == NULL) {
3101 /* this is now an array without redundancy, so
3102 * it must always be in_sync
3105 del_timer_sync(&mddev->safemode_timer);
3108 mddev_resume(mddev);
3109 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3110 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3111 md_wakeup_thread(mddev->thread);
3112 sysfs_notify(&mddev->kobj, NULL, "level");
3113 md_new_event(mddev);
3117 static struct md_sysfs_entry md_level =
3118 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3122 layout_show(mddev_t *mddev, char *page)
3124 /* just a number, not meaningful for all levels */
3125 if (mddev->reshape_position != MaxSector &&
3126 mddev->layout != mddev->new_layout)
3127 return sprintf(page, "%d (%d)\n",
3128 mddev->new_layout, mddev->layout);
3129 return sprintf(page, "%d\n", mddev->layout);
3133 layout_store(mddev_t *mddev, const char *buf, size_t len)
3136 unsigned long n = simple_strtoul(buf, &e, 10);
3138 if (!*buf || (*e && *e != '\n'))
3143 if (mddev->pers->check_reshape == NULL)
3145 mddev->new_layout = n;
3146 err = mddev->pers->check_reshape(mddev);
3148 mddev->new_layout = mddev->layout;
3152 mddev->new_layout = n;
3153 if (mddev->reshape_position == MaxSector)
3158 static struct md_sysfs_entry md_layout =
3159 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3163 raid_disks_show(mddev_t *mddev, char *page)
3165 if (mddev->raid_disks == 0)
3167 if (mddev->reshape_position != MaxSector &&
3168 mddev->delta_disks != 0)
3169 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3170 mddev->raid_disks - mddev->delta_disks);
3171 return sprintf(page, "%d\n", mddev->raid_disks);
3174 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3177 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3181 unsigned long n = simple_strtoul(buf, &e, 10);
3183 if (!*buf || (*e && *e != '\n'))
3187 rv = update_raid_disks(mddev, n);
3188 else if (mddev->reshape_position != MaxSector) {
3189 int olddisks = mddev->raid_disks - mddev->delta_disks;
3190 mddev->delta_disks = n - olddisks;
3191 mddev->raid_disks = n;
3193 mddev->raid_disks = n;
3194 return rv ? rv : len;
3196 static struct md_sysfs_entry md_raid_disks =
3197 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3200 chunk_size_show(mddev_t *mddev, char *page)
3202 if (mddev->reshape_position != MaxSector &&
3203 mddev->chunk_sectors != mddev->new_chunk_sectors)
3204 return sprintf(page, "%d (%d)\n",
3205 mddev->new_chunk_sectors << 9,
3206 mddev->chunk_sectors << 9);
3207 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3211 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3214 unsigned long n = simple_strtoul(buf, &e, 10);
3216 if (!*buf || (*e && *e != '\n'))
3221 if (mddev->pers->check_reshape == NULL)
3223 mddev->new_chunk_sectors = n >> 9;
3224 err = mddev->pers->check_reshape(mddev);
3226 mddev->new_chunk_sectors = mddev->chunk_sectors;
3230 mddev->new_chunk_sectors = n >> 9;
3231 if (mddev->reshape_position == MaxSector)
3232 mddev->chunk_sectors = n >> 9;
3236 static struct md_sysfs_entry md_chunk_size =
3237 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3240 resync_start_show(mddev_t *mddev, char *page)
3242 if (mddev->recovery_cp == MaxSector)
3243 return sprintf(page, "none\n");
3244 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3248 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3251 unsigned long long n = simple_strtoull(buf, &e, 10);
3255 if (cmd_match(buf, "none"))
3257 else if (!*buf || (*e && *e != '\n'))
3260 mddev->recovery_cp = n;
3263 static struct md_sysfs_entry md_resync_start =
3264 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3267 * The array state can be:
3270 * No devices, no size, no level
3271 * Equivalent to STOP_ARRAY ioctl
3273 * May have some settings, but array is not active
3274 * all IO results in error
3275 * When written, doesn't tear down array, but just stops it
3276 * suspended (not supported yet)
3277 * All IO requests will block. The array can be reconfigured.
3278 * Writing this, if accepted, will block until array is quiescent
3280 * no resync can happen. no superblocks get written.
3281 * write requests fail
3283 * like readonly, but behaves like 'clean' on a write request.
3285 * clean - no pending writes, but otherwise active.
3286 * When written to inactive array, starts without resync
3287 * If a write request arrives then
3288 * if metadata is known, mark 'dirty' and switch to 'active'.
3289 * if not known, block and switch to write-pending
3290 * If written to an active array that has pending writes, then fails.
3292 * fully active: IO and resync can be happening.
3293 * When written to inactive array, starts with resync
3296 * clean, but writes are blocked waiting for 'active' to be written.
3299 * like active, but no writes have been seen for a while (100msec).
3302 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3303 write_pending, active_idle, bad_word};
3304 static char *array_states[] = {
3305 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3306 "write-pending", "active-idle", NULL };
3308 static int match_word(const char *word, char **list)
3311 for (n=0; list[n]; n++)
3312 if (cmd_match(word, list[n]))
3318 array_state_show(mddev_t *mddev, char *page)
3320 enum array_state st = inactive;
3333 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3335 else if (mddev->safemode)
3341 if (list_empty(&mddev->disks) &&
3342 mddev->raid_disks == 0 &&
3343 mddev->dev_sectors == 0)
3348 return sprintf(page, "%s\n", array_states[st]);
3351 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3352 static int md_set_readonly(mddev_t * mddev, int is_open);
3353 static int do_md_run(mddev_t * mddev);
3354 static int restart_array(mddev_t *mddev);
3357 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3360 enum array_state st = match_word(buf, array_states);
3365 /* stopping an active array */
3366 if (atomic_read(&mddev->openers) > 0)
3368 err = do_md_stop(mddev, 0, 0);
3371 /* stopping an active array */
3373 if (atomic_read(&mddev->openers) > 0)
3375 err = do_md_stop(mddev, 2, 0);
3377 err = 0; /* already inactive */
3380 break; /* not supported yet */
3383 err = md_set_readonly(mddev, 0);
3386 set_disk_ro(mddev->gendisk, 1);
3387 err = do_md_run(mddev);
3393 err = md_set_readonly(mddev, 0);
3394 else if (mddev->ro == 1)
3395 err = restart_array(mddev);
3398 set_disk_ro(mddev->gendisk, 0);
3402 err = do_md_run(mddev);
3407 restart_array(mddev);
3408 spin_lock_irq(&mddev->write_lock);
3409 if (atomic_read(&mddev->writes_pending) == 0) {
3410 if (mddev->in_sync == 0) {
3412 if (mddev->safemode == 1)
3413 mddev->safemode = 0;
3414 if (mddev->persistent)
3415 set_bit(MD_CHANGE_CLEAN,
3421 spin_unlock_irq(&mddev->write_lock);
3427 restart_array(mddev);
3428 if (mddev->external)
3429 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3430 wake_up(&mddev->sb_wait);
3434 set_disk_ro(mddev->gendisk, 0);
3435 err = do_md_run(mddev);
3440 /* these cannot be set */
3446 sysfs_notify_dirent(mddev->sysfs_state);
3450 static struct md_sysfs_entry md_array_state =
3451 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3454 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3455 return sprintf(page, "%d\n",
3456 atomic_read(&mddev->max_corr_read_errors));
3460 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3463 unsigned long n = simple_strtoul(buf, &e, 10);
3465 if (*buf && (*e == 0 || *e == '\n')) {
3466 atomic_set(&mddev->max_corr_read_errors, n);
3472 static struct md_sysfs_entry max_corr_read_errors =
3473 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3474 max_corrected_read_errors_store);
3477 null_show(mddev_t *mddev, char *page)
3483 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3485 /* buf must be %d:%d\n? giving major and minor numbers */
3486 /* The new device is added to the array.
3487 * If the array has a persistent superblock, we read the
3488 * superblock to initialise info and check validity.
3489 * Otherwise, only checking done is that in bind_rdev_to_array,
3490 * which mainly checks size.
3493 int major = simple_strtoul(buf, &e, 10);
3499 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3501 minor = simple_strtoul(e+1, &e, 10);
3502 if (*e && *e != '\n')
3504 dev = MKDEV(major, minor);
3505 if (major != MAJOR(dev) ||
3506 minor != MINOR(dev))
3510 if (mddev->persistent) {
3511 rdev = md_import_device(dev, mddev->major_version,
3512 mddev->minor_version);
3513 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3514 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3515 mdk_rdev_t, same_set);
3516 err = super_types[mddev->major_version]
3517 .load_super(rdev, rdev0, mddev->minor_version);
3521 } else if (mddev->external)
3522 rdev = md_import_device(dev, -2, -1);
3524 rdev = md_import_device(dev, -1, -1);
3527 return PTR_ERR(rdev);
3528 err = bind_rdev_to_array(rdev, mddev);
3532 return err ? err : len;
3535 static struct md_sysfs_entry md_new_device =
3536 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3539 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3542 unsigned long chunk, end_chunk;
3546 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3548 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3549 if (buf == end) break;
3550 if (*end == '-') { /* range */
3552 end_chunk = simple_strtoul(buf, &end, 0);
3553 if (buf == end) break;
3555 if (*end && !isspace(*end)) break;
3556 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3557 buf = skip_spaces(end);
3559 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3564 static struct md_sysfs_entry md_bitmap =
3565 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3568 size_show(mddev_t *mddev, char *page)
3570 return sprintf(page, "%llu\n",
3571 (unsigned long long)mddev->dev_sectors / 2);
3574 static int update_size(mddev_t *mddev, sector_t num_sectors);
3577 size_store(mddev_t *mddev, const char *buf, size_t len)
3579 /* If array is inactive, we can reduce the component size, but
3580 * not increase it (except from 0).
3581 * If array is active, we can try an on-line resize
3584 int err = strict_blocks_to_sectors(buf, §ors);
3589 err = update_size(mddev, sectors);
3590 md_update_sb(mddev, 1);
3592 if (mddev->dev_sectors == 0 ||
3593 mddev->dev_sectors > sectors)
3594 mddev->dev_sectors = sectors;
3598 return err ? err : len;
3601 static struct md_sysfs_entry md_size =
3602 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3607 * 'none' for arrays with no metadata (good luck...)
3608 * 'external' for arrays with externally managed metadata,
3609 * or N.M for internally known formats
3612 metadata_show(mddev_t *mddev, char *page)
3614 if (mddev->persistent)
3615 return sprintf(page, "%d.%d\n",
3616 mddev->major_version, mddev->minor_version);
3617 else if (mddev->external)
3618 return sprintf(page, "external:%s\n", mddev->metadata_type);
3620 return sprintf(page, "none\n");
3624 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3628 /* Changing the details of 'external' metadata is
3629 * always permitted. Otherwise there must be
3630 * no devices attached to the array.
3632 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3634 else if (!list_empty(&mddev->disks))
3637 if (cmd_match(buf, "none")) {
3638 mddev->persistent = 0;
3639 mddev->external = 0;
3640 mddev->major_version = 0;
3641 mddev->minor_version = 90;
3644 if (strncmp(buf, "external:", 9) == 0) {
3645 size_t namelen = len-9;
3646 if (namelen >= sizeof(mddev->metadata_type))
3647 namelen = sizeof(mddev->metadata_type)-1;
3648 strncpy(mddev->metadata_type, buf+9, namelen);
3649 mddev->metadata_type[namelen] = 0;
3650 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3651 mddev->metadata_type[--namelen] = 0;
3652 mddev->persistent = 0;
3653 mddev->external = 1;
3654 mddev->major_version = 0;
3655 mddev->minor_version = 90;
3658 major = simple_strtoul(buf, &e, 10);
3659 if (e==buf || *e != '.')
3662 minor = simple_strtoul(buf, &e, 10);
3663 if (e==buf || (*e && *e != '\n') )
3665 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3667 mddev->major_version = major;
3668 mddev->minor_version = minor;
3669 mddev->persistent = 1;
3670 mddev->external = 0;
3674 static struct md_sysfs_entry md_metadata =
3675 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3678 action_show(mddev_t *mddev, char *page)
3680 char *type = "idle";
3681 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3683 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3684 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3685 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3687 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3688 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3690 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3694 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3697 return sprintf(page, "%s\n", type);
3701 action_store(mddev_t *mddev, const char *page, size_t len)
3703 if (!mddev->pers || !mddev->pers->sync_request)
3706 if (cmd_match(page, "frozen"))
3707 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3709 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3711 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3712 if (mddev->sync_thread) {
3713 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3714 md_unregister_thread(mddev->sync_thread);
3715 mddev->sync_thread = NULL;
3716 mddev->recovery = 0;
3718 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3719 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3721 else if (cmd_match(page, "resync"))
3722 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3723 else if (cmd_match(page, "recover")) {
3724 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3725 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3726 } else if (cmd_match(page, "reshape")) {
3728 if (mddev->pers->start_reshape == NULL)
3730 err = mddev->pers->start_reshape(mddev);
3733 sysfs_notify(&mddev->kobj, NULL, "degraded");
3735 if (cmd_match(page, "check"))
3736 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3737 else if (!cmd_match(page, "repair"))
3739 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3740 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3742 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3743 md_wakeup_thread(mddev->thread);
3744 sysfs_notify_dirent(mddev->sysfs_action);
3749 mismatch_cnt_show(mddev_t *mddev, char *page)
3751 return sprintf(page, "%llu\n",
3752 (unsigned long long) mddev->resync_mismatches);
3755 static struct md_sysfs_entry md_scan_mode =
3756 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3759 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3762 sync_min_show(mddev_t *mddev, char *page)
3764 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3765 mddev->sync_speed_min ? "local": "system");
3769 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3773 if (strncmp(buf, "system", 6)==0) {
3774 mddev->sync_speed_min = 0;
3777 min = simple_strtoul(buf, &e, 10);
3778 if (buf == e || (*e && *e != '\n') || min <= 0)
3780 mddev->sync_speed_min = min;
3784 static struct md_sysfs_entry md_sync_min =
3785 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3788 sync_max_show(mddev_t *mddev, char *page)
3790 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3791 mddev->sync_speed_max ? "local": "system");
3795 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3799 if (strncmp(buf, "system", 6)==0) {
3800 mddev->sync_speed_max = 0;
3803 max = simple_strtoul(buf, &e, 10);
3804 if (buf == e || (*e && *e != '\n') || max <= 0)
3806 mddev->sync_speed_max = max;
3810 static struct md_sysfs_entry md_sync_max =
3811 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3814 degraded_show(mddev_t *mddev, char *page)
3816 return sprintf(page, "%d\n", mddev->degraded);
3818 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3821 sync_force_parallel_show(mddev_t *mddev, char *page)
3823 return sprintf(page, "%d\n", mddev->parallel_resync);
3827 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3831 if (strict_strtol(buf, 10, &n))
3834 if (n != 0 && n != 1)
3837 mddev->parallel_resync = n;
3839 if (mddev->sync_thread)
3840 wake_up(&resync_wait);
3845 /* force parallel resync, even with shared block devices */
3846 static struct md_sysfs_entry md_sync_force_parallel =
3847 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3848 sync_force_parallel_show, sync_force_parallel_store);
3851 sync_speed_show(mddev_t *mddev, char *page)
3853 unsigned long resync, dt, db;
3854 if (mddev->curr_resync == 0)
3855 return sprintf(page, "none\n");
3856 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3857 dt = (jiffies - mddev->resync_mark) / HZ;
3859 db = resync - mddev->resync_mark_cnt;
3860 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3863 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3866 sync_completed_show(mddev_t *mddev, char *page)
3868 unsigned long max_sectors, resync;
3870 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3871 return sprintf(page, "none\n");
3873 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3874 max_sectors = mddev->resync_max_sectors;
3876 max_sectors = mddev->dev_sectors;
3878 resync = mddev->curr_resync_completed;
3879 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3882 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3885 min_sync_show(mddev_t *mddev, char *page)
3887 return sprintf(page, "%llu\n",
3888 (unsigned long long)mddev->resync_min);
3891 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3893 unsigned long long min;
3894 if (strict_strtoull(buf, 10, &min))
3896 if (min > mddev->resync_max)
3898 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3901 /* Must be a multiple of chunk_size */
3902 if (mddev->chunk_sectors) {
3903 sector_t temp = min;
3904 if (sector_div(temp, mddev->chunk_sectors))
3907 mddev->resync_min = min;
3912 static struct md_sysfs_entry md_min_sync =
3913 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3916 max_sync_show(mddev_t *mddev, char *page)
3918 if (mddev->resync_max == MaxSector)
3919 return sprintf(page, "max\n");
3921 return sprintf(page, "%llu\n",
3922 (unsigned long long)mddev->resync_max);
3925 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3927 if (strncmp(buf, "max", 3) == 0)
3928 mddev->resync_max = MaxSector;
3930 unsigned long long max;
3931 if (strict_strtoull(buf, 10, &max))
3933 if (max < mddev->resync_min)
3935 if (max < mddev->resync_max &&
3937 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3940 /* Must be a multiple of chunk_size */
3941 if (mddev->chunk_sectors) {
3942 sector_t temp = max;
3943 if (sector_div(temp, mddev->chunk_sectors))
3946 mddev->resync_max = max;
3948 wake_up(&mddev->recovery_wait);
3952 static struct md_sysfs_entry md_max_sync =
3953 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3956 suspend_lo_show(mddev_t *mddev, char *page)
3958 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3962 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3965 unsigned long long new = simple_strtoull(buf, &e, 10);
3967 if (mddev->pers == NULL ||
3968 mddev->pers->quiesce == NULL)
3970 if (buf == e || (*e && *e != '\n'))
3972 if (new >= mddev->suspend_hi ||
3973 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3974 mddev->suspend_lo = new;
3975 mddev->pers->quiesce(mddev, 2);
3980 static struct md_sysfs_entry md_suspend_lo =
3981 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3985 suspend_hi_show(mddev_t *mddev, char *page)
3987 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3991 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3994 unsigned long long new = simple_strtoull(buf, &e, 10);
3996 if (mddev->pers == NULL ||
3997 mddev->pers->quiesce == NULL)
3999 if (buf == e || (*e && *e != '\n'))
4001 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
4002 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
4003 mddev->suspend_hi = new;
4004 mddev->pers->quiesce(mddev, 1);
4005 mddev->pers->quiesce(mddev, 0);
4010 static struct md_sysfs_entry md_suspend_hi =
4011 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4014 reshape_position_show(mddev_t *mddev, char *page)
4016 if (mddev->reshape_position != MaxSector)
4017 return sprintf(page, "%llu\n",
4018 (unsigned long long)mddev->reshape_position);
4019 strcpy(page, "none\n");
4024 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4027 unsigned long long new = simple_strtoull(buf, &e, 10);
4030 if (buf == e || (*e && *e != '\n'))
4032 mddev->reshape_position = new;
4033 mddev->delta_disks = 0;
4034 mddev->new_level = mddev->level;
4035 mddev->new_layout = mddev->layout;
4036 mddev->new_chunk_sectors = mddev->chunk_sectors;
4040 static struct md_sysfs_entry md_reshape_position =
4041 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4042 reshape_position_store);
4045 array_size_show(mddev_t *mddev, char *page)
4047 if (mddev->external_size)
4048 return sprintf(page, "%llu\n",
4049 (unsigned long long)mddev->array_sectors/2);
4051 return sprintf(page, "default\n");
4055 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4059 if (strncmp(buf, "default", 7) == 0) {
4061 sectors = mddev->pers->size(mddev, 0, 0);
4063 sectors = mddev->array_sectors;
4065 mddev->external_size = 0;
4067 if (strict_blocks_to_sectors(buf, §ors) < 0)
4069 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4072 mddev->external_size = 1;
4075 mddev->array_sectors = sectors;
4076 set_capacity(mddev->gendisk, mddev->array_sectors);
4078 revalidate_disk(mddev->gendisk);
4083 static struct md_sysfs_entry md_array_size =
4084 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4087 static struct attribute *md_default_attrs[] = {
4090 &md_raid_disks.attr,
4091 &md_chunk_size.attr,
4093 &md_resync_start.attr,
4095 &md_new_device.attr,
4096 &md_safe_delay.attr,
4097 &md_array_state.attr,
4098 &md_reshape_position.attr,
4099 &md_array_size.attr,
4100 &max_corr_read_errors.attr,
4104 static struct attribute *md_redundancy_attrs[] = {
4106 &md_mismatches.attr,
4109 &md_sync_speed.attr,
4110 &md_sync_force_parallel.attr,
4111 &md_sync_completed.attr,
4114 &md_suspend_lo.attr,
4115 &md_suspend_hi.attr,
4120 static struct attribute_group md_redundancy_group = {
4122 .attrs = md_redundancy_attrs,
4127 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4129 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4130 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4135 rv = mddev_lock(mddev);
4137 rv = entry->show(mddev, page);
4138 mddev_unlock(mddev);
4144 md_attr_store(struct kobject *kobj, struct attribute *attr,
4145 const char *page, size_t length)
4147 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4148 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4153 if (!capable(CAP_SYS_ADMIN))
4155 rv = mddev_lock(mddev);
4156 if (mddev->hold_active == UNTIL_IOCTL)
4157 mddev->hold_active = 0;
4159 rv = entry->store(mddev, page, length);
4160 mddev_unlock(mddev);
4165 static void md_free(struct kobject *ko)
4167 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4169 if (mddev->sysfs_state)
4170 sysfs_put(mddev->sysfs_state);
4172 if (mddev->gendisk) {
4173 del_gendisk(mddev->gendisk);
4174 put_disk(mddev->gendisk);
4177 blk_cleanup_queue(mddev->queue);
4182 static const struct sysfs_ops md_sysfs_ops = {
4183 .show = md_attr_show,
4184 .store = md_attr_store,
4186 static struct kobj_type md_ktype = {
4188 .sysfs_ops = &md_sysfs_ops,
4189 .default_attrs = md_default_attrs,
4194 static void mddev_delayed_delete(struct work_struct *ws)
4196 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4198 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4199 kobject_del(&mddev->kobj);
4200 kobject_put(&mddev->kobj);
4203 static int md_alloc(dev_t dev, char *name)
4205 static DEFINE_MUTEX(disks_mutex);
4206 mddev_t *mddev = mddev_find(dev);
4207 struct gendisk *disk;
4216 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4217 shift = partitioned ? MdpMinorShift : 0;
4218 unit = MINOR(mddev->unit) >> shift;
4220 /* wait for any previous instance if this device
4221 * to be completed removed (mddev_delayed_delete).
4223 flush_scheduled_work();
4225 mutex_lock(&disks_mutex);
4231 /* Need to ensure that 'name' is not a duplicate.
4234 spin_lock(&all_mddevs_lock);
4236 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4237 if (mddev2->gendisk &&
4238 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4239 spin_unlock(&all_mddevs_lock);
4242 spin_unlock(&all_mddevs_lock);
4246 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4249 mddev->queue->queuedata = mddev;
4251 /* Can be unlocked because the queue is new: no concurrency */
4252 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4254 blk_queue_make_request(mddev->queue, md_make_request);
4256 disk = alloc_disk(1 << shift);
4258 blk_cleanup_queue(mddev->queue);
4259 mddev->queue = NULL;
4262 disk->major = MAJOR(mddev->unit);
4263 disk->first_minor = unit << shift;
4265 strcpy(disk->disk_name, name);
4266 else if (partitioned)
4267 sprintf(disk->disk_name, "md_d%d", unit);
4269 sprintf(disk->disk_name, "md%d", unit);
4270 disk->fops = &md_fops;
4271 disk->private_data = mddev;
4272 disk->queue = mddev->queue;
4273 /* Allow extended partitions. This makes the
4274 * 'mdp' device redundant, but we can't really
4277 disk->flags |= GENHD_FL_EXT_DEVT;
4279 mddev->gendisk = disk;
4280 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4281 &disk_to_dev(disk)->kobj, "%s", "md");
4283 /* This isn't possible, but as kobject_init_and_add is marked
4284 * __must_check, we must do something with the result
4286 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4290 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4291 printk(KERN_DEBUG "pointless warning\n");
4293 mutex_unlock(&disks_mutex);
4295 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4296 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, NULL, "array_state");
4302 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4304 md_alloc(dev, NULL);
4308 static int add_named_array(const char *val, struct kernel_param *kp)
4310 /* val must be "md_*" where * is not all digits.
4311 * We allocate an array with a large free minor number, and
4312 * set the name to val. val must not already be an active name.
4314 int len = strlen(val);
4315 char buf[DISK_NAME_LEN];
4317 while (len && val[len-1] == '\n')
4319 if (len >= DISK_NAME_LEN)
4321 strlcpy(buf, val, len+1);
4322 if (strncmp(buf, "md_", 3) != 0)
4324 return md_alloc(0, buf);
4327 static void md_safemode_timeout(unsigned long data)
4329 mddev_t *mddev = (mddev_t *) data;
4331 if (!atomic_read(&mddev->writes_pending)) {
4332 mddev->safemode = 1;
4333 if (mddev->external)
4334 sysfs_notify_dirent(mddev->sysfs_state);
4336 md_wakeup_thread(mddev->thread);
4339 static int start_dirty_degraded;
4341 static int md_run(mddev_t *mddev)
4345 struct mdk_personality *pers;
4347 if (list_empty(&mddev->disks))
4348 /* cannot run an array with no devices.. */
4353 /* Cannot run until previous stop completes properly */
4354 if (mddev->sysfs_active)
4358 * Analyze all RAID superblock(s)
4360 if (!mddev->raid_disks) {
4361 if (!mddev->persistent)
4366 if (mddev->level != LEVEL_NONE)
4367 request_module("md-level-%d", mddev->level);
4368 else if (mddev->clevel[0])
4369 request_module("md-%s", mddev->clevel);
4372 * Drop all container device buffers, from now on
4373 * the only valid external interface is through the md
4376 list_for_each_entry(rdev, &mddev->disks, same_set) {
4377 if (test_bit(Faulty, &rdev->flags))
4379 sync_blockdev(rdev->bdev);
4380 invalidate_bdev(rdev->bdev);
4382 /* perform some consistency tests on the device.
4383 * We don't want the data to overlap the metadata,
4384 * Internal Bitmap issues have been handled elsewhere.
4386 if (rdev->data_offset < rdev->sb_start) {
4387 if (mddev->dev_sectors &&
4388 rdev->data_offset + mddev->dev_sectors
4390 printk("md: %s: data overlaps metadata\n",
4395 if (rdev->sb_start + rdev->sb_size/512
4396 > rdev->data_offset) {
4397 printk("md: %s: metadata overlaps data\n",
4402 sysfs_notify_dirent(rdev->sysfs_state);
4405 spin_lock(&pers_lock);
4406 pers = find_pers(mddev->level, mddev->clevel);
4407 if (!pers || !try_module_get(pers->owner)) {
4408 spin_unlock(&pers_lock);
4409 if (mddev->level != LEVEL_NONE)
4410 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4413 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4418 spin_unlock(&pers_lock);
4419 if (mddev->level != pers->level) {
4420 mddev->level = pers->level;
4421 mddev->new_level = pers->level;
4423 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4425 if (mddev->reshape_position != MaxSector &&
4426 pers->start_reshape == NULL) {
4427 /* This personality cannot handle reshaping... */
4429 module_put(pers->owner);
4433 if (pers->sync_request) {
4434 /* Warn if this is a potentially silly
4437 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4441 list_for_each_entry(rdev, &mddev->disks, same_set)
4442 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4444 rdev->bdev->bd_contains ==
4445 rdev2->bdev->bd_contains) {
4447 "%s: WARNING: %s appears to be"
4448 " on the same physical disk as"
4451 bdevname(rdev->bdev,b),
4452 bdevname(rdev2->bdev,b2));
4459 "True protection against single-disk"
4460 " failure might be compromised.\n");
4463 mddev->recovery = 0;
4464 /* may be over-ridden by personality */
4465 mddev->resync_max_sectors = mddev->dev_sectors;
4467 mddev->barriers_work = 1;
4468 mddev->ok_start_degraded = start_dirty_degraded;
4470 if (start_readonly && mddev->ro == 0)
4471 mddev->ro = 2; /* read-only, but switch on first write */
4473 err = mddev->pers->run(mddev);
4475 printk(KERN_ERR "md: pers->run() failed ...\n");
4476 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4477 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4478 " but 'external_size' not in effect?\n", __func__);
4480 "md: invalid array_size %llu > default size %llu\n",
4481 (unsigned long long)mddev->array_sectors / 2,
4482 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4484 mddev->pers->stop(mddev);
4486 if (err == 0 && mddev->pers->sync_request) {
4487 err = bitmap_create(mddev);
4489 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4490 mdname(mddev), err);
4491 mddev->pers->stop(mddev);
4495 module_put(mddev->pers->owner);
4497 bitmap_destroy(mddev);
4500 if (mddev->pers->sync_request) {
4501 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4503 "md: cannot register extra attributes for %s\n",
4505 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
4506 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4509 atomic_set(&mddev->writes_pending,0);
4510 atomic_set(&mddev->max_corr_read_errors,
4511 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4512 mddev->safemode = 0;
4513 mddev->safemode_timer.function = md_safemode_timeout;
4514 mddev->safemode_timer.data = (unsigned long) mddev;
4515 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4518 list_for_each_entry(rdev, &mddev->disks, same_set)
4519 if (rdev->raid_disk >= 0) {
4521 sprintf(nm, "rd%d", rdev->raid_disk);
4522 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4523 printk("md: cannot register %s for %s\n",
4527 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4530 md_update_sb(mddev, 0);
4532 md_wakeup_thread(mddev->thread);
4533 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4535 md_new_event(mddev);
4536 sysfs_notify_dirent(mddev->sysfs_state);
4537 if (mddev->sysfs_action)
4538 sysfs_notify_dirent(mddev->sysfs_action);
4539 sysfs_notify(&mddev->kobj, NULL, "degraded");
4543 static int do_md_run(mddev_t *mddev)
4547 err = md_run(mddev);
4551 set_capacity(mddev->gendisk, mddev->array_sectors);
4552 revalidate_disk(mddev->gendisk);
4553 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4558 static int restart_array(mddev_t *mddev)
4560 struct gendisk *disk = mddev->gendisk;
4562 /* Complain if it has no devices */
4563 if (list_empty(&mddev->disks))
4569 mddev->safemode = 0;
4571 set_disk_ro(disk, 0);
4572 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4574 /* Kick recovery or resync if necessary */
4575 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4576 md_wakeup_thread(mddev->thread);
4577 md_wakeup_thread(mddev->sync_thread);
4578 sysfs_notify_dirent(mddev->sysfs_state);
4582 /* similar to deny_write_access, but accounts for our holding a reference
4583 * to the file ourselves */
4584 static int deny_bitmap_write_access(struct file * file)
4586 struct inode *inode = file->f_mapping->host;
4588 spin_lock(&inode->i_lock);
4589 if (atomic_read(&inode->i_writecount) > 1) {
4590 spin_unlock(&inode->i_lock);
4593 atomic_set(&inode->i_writecount, -1);
4594 spin_unlock(&inode->i_lock);
4599 void restore_bitmap_write_access(struct file *file)
4601 struct inode *inode = file->f_mapping->host;
4603 spin_lock(&inode->i_lock);
4604 atomic_set(&inode->i_writecount, 1);
4605 spin_unlock(&inode->i_lock);
4608 static void md_clean(mddev_t *mddev)
4610 mddev->array_sectors = 0;
4611 mddev->external_size = 0;
4612 mddev->dev_sectors = 0;
4613 mddev->raid_disks = 0;
4614 mddev->recovery_cp = 0;
4615 mddev->resync_min = 0;
4616 mddev->resync_max = MaxSector;
4617 mddev->reshape_position = MaxSector;
4618 mddev->external = 0;
4619 mddev->persistent = 0;
4620 mddev->level = LEVEL_NONE;
4621 mddev->clevel[0] = 0;
4624 mddev->metadata_type[0] = 0;
4625 mddev->chunk_sectors = 0;
4626 mddev->ctime = mddev->utime = 0;
4628 mddev->max_disks = 0;
4630 mddev->can_decrease_events = 0;
4631 mddev->delta_disks = 0;
4632 mddev->new_level = LEVEL_NONE;
4633 mddev->new_layout = 0;
4634 mddev->new_chunk_sectors = 0;
4635 mddev->curr_resync = 0;
4636 mddev->resync_mismatches = 0;
4637 mddev->suspend_lo = mddev->suspend_hi = 0;
4638 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4639 mddev->recovery = 0;
4641 mddev->degraded = 0;
4642 mddev->barriers_work = 0;
4643 mddev->safemode = 0;
4644 mddev->bitmap_info.offset = 0;
4645 mddev->bitmap_info.default_offset = 0;
4646 mddev->bitmap_info.chunksize = 0;
4647 mddev->bitmap_info.daemon_sleep = 0;
4648 mddev->bitmap_info.max_write_behind = 0;
4651 static void md_stop_writes(mddev_t *mddev)
4653 if (mddev->sync_thread) {
4654 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4655 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4656 md_unregister_thread(mddev->sync_thread);
4657 mddev->sync_thread = NULL;
4660 del_timer_sync(&mddev->safemode_timer);
4662 bitmap_flush(mddev);
4663 md_super_wait(mddev);
4665 if (!mddev->in_sync || mddev->flags) {
4666 /* mark array as shutdown cleanly */
4668 md_update_sb(mddev, 1);
4672 static void md_stop(mddev_t *mddev)
4674 md_stop_writes(mddev);
4676 mddev->pers->stop(mddev);
4677 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4678 mddev->to_remove = &md_redundancy_group;
4679 module_put(mddev->pers->owner);
4681 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4684 static int md_set_readonly(mddev_t *mddev, int is_open)
4687 mutex_lock(&mddev->open_mutex);
4688 if (atomic_read(&mddev->openers) > is_open) {
4689 printk("md: %s still in use.\n",mdname(mddev));
4694 md_stop_writes(mddev);
4700 set_disk_ro(mddev->gendisk, 1);
4701 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4702 sysfs_notify_dirent(mddev->sysfs_state);
4706 mutex_unlock(&mddev->open_mutex);
4711 * 0 - completely stop and dis-assemble array
4712 * 2 - stop but do not disassemble array
4714 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4716 int err = 0, revalidate = 0;
4717 struct gendisk *disk = mddev->gendisk;
4720 mutex_lock(&mddev->open_mutex);
4721 if (atomic_read(&mddev->openers) > is_open ||
4722 mddev->sysfs_active) {
4723 printk("md: %s still in use.\n",mdname(mddev));
4725 } else if (mddev->pers) {
4728 set_disk_ro(disk, 0);
4731 mddev->queue->merge_bvec_fn = NULL;
4732 mddev->queue->unplug_fn = NULL;
4733 mddev->queue->backing_dev_info.congested_fn = NULL;
4735 /* tell userspace to handle 'inactive' */
4736 sysfs_notify_dirent(mddev->sysfs_state);
4738 list_for_each_entry(rdev, &mddev->disks, same_set)
4739 if (rdev->raid_disk >= 0) {
4741 sprintf(nm, "rd%d", rdev->raid_disk);
4742 sysfs_remove_link(&mddev->kobj, nm);
4745 set_capacity(disk, 0);
4753 mutex_unlock(&mddev->open_mutex);
4755 revalidate_disk(disk);
4759 * Free resources if final stop
4763 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4765 bitmap_destroy(mddev);
4766 if (mddev->bitmap_info.file) {
4767 restore_bitmap_write_access(mddev->bitmap_info.file);
4768 fput(mddev->bitmap_info.file);
4769 mddev->bitmap_info.file = NULL;
4771 mddev->bitmap_info.offset = 0;
4773 export_array(mddev);
4776 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4777 if (mddev->hold_active == UNTIL_STOP)
4778 mddev->hold_active = 0;
4782 blk_integrity_unregister(disk);
4783 md_new_event(mddev);
4784 sysfs_notify_dirent(mddev->sysfs_state);
4789 static void autorun_array(mddev_t *mddev)
4794 if (list_empty(&mddev->disks))
4797 printk(KERN_INFO "md: running: ");
4799 list_for_each_entry(rdev, &mddev->disks, same_set) {
4800 char b[BDEVNAME_SIZE];
4801 printk("<%s>", bdevname(rdev->bdev,b));
4805 err = do_md_run(mddev);
4807 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4808 do_md_stop(mddev, 0, 0);
4813 * lets try to run arrays based on all disks that have arrived
4814 * until now. (those are in pending_raid_disks)
4816 * the method: pick the first pending disk, collect all disks with
4817 * the same UUID, remove all from the pending list and put them into
4818 * the 'same_array' list. Then order this list based on superblock
4819 * update time (freshest comes first), kick out 'old' disks and
4820 * compare superblocks. If everything's fine then run it.
4822 * If "unit" is allocated, then bump its reference count
4824 static void autorun_devices(int part)
4826 mdk_rdev_t *rdev0, *rdev, *tmp;
4828 char b[BDEVNAME_SIZE];
4830 printk(KERN_INFO "md: autorun ...\n");
4831 while (!list_empty(&pending_raid_disks)) {
4834 LIST_HEAD(candidates);
4835 rdev0 = list_entry(pending_raid_disks.next,
4836 mdk_rdev_t, same_set);
4838 printk(KERN_INFO "md: considering %s ...\n",
4839 bdevname(rdev0->bdev,b));
4840 INIT_LIST_HEAD(&candidates);
4841 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4842 if (super_90_load(rdev, rdev0, 0) >= 0) {
4843 printk(KERN_INFO "md: adding %s ...\n",
4844 bdevname(rdev->bdev,b));
4845 list_move(&rdev->same_set, &candidates);
4848 * now we have a set of devices, with all of them having
4849 * mostly sane superblocks. It's time to allocate the
4853 dev = MKDEV(mdp_major,
4854 rdev0->preferred_minor << MdpMinorShift);
4855 unit = MINOR(dev) >> MdpMinorShift;
4857 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4860 if (rdev0->preferred_minor != unit) {
4861 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4862 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4866 md_probe(dev, NULL, NULL);
4867 mddev = mddev_find(dev);
4868 if (!mddev || !mddev->gendisk) {
4872 "md: cannot allocate memory for md drive.\n");
4875 if (mddev_lock(mddev))
4876 printk(KERN_WARNING "md: %s locked, cannot run\n",
4878 else if (mddev->raid_disks || mddev->major_version
4879 || !list_empty(&mddev->disks)) {
4881 "md: %s already running, cannot run %s\n",
4882 mdname(mddev), bdevname(rdev0->bdev,b));
4883 mddev_unlock(mddev);
4885 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4886 mddev->persistent = 1;
4887 rdev_for_each_list(rdev, tmp, &candidates) {
4888 list_del_init(&rdev->same_set);
4889 if (bind_rdev_to_array(rdev, mddev))
4892 autorun_array(mddev);
4893 mddev_unlock(mddev);
4895 /* on success, candidates will be empty, on error
4898 rdev_for_each_list(rdev, tmp, &candidates) {
4899 list_del_init(&rdev->same_set);
4904 printk(KERN_INFO "md: ... autorun DONE.\n");
4906 #endif /* !MODULE */
4908 static int get_version(void __user * arg)
4912 ver.major = MD_MAJOR_VERSION;
4913 ver.minor = MD_MINOR_VERSION;
4914 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4916 if (copy_to_user(arg, &ver, sizeof(ver)))
4922 static int get_array_info(mddev_t * mddev, void __user * arg)
4924 mdu_array_info_t info;
4925 int nr,working,insync,failed,spare;
4928 nr=working=insync=failed=spare=0;
4929 list_for_each_entry(rdev, &mddev->disks, same_set) {
4931 if (test_bit(Faulty, &rdev->flags))
4935 if (test_bit(In_sync, &rdev->flags))
4942 info.major_version = mddev->major_version;
4943 info.minor_version = mddev->minor_version;
4944 info.patch_version = MD_PATCHLEVEL_VERSION;
4945 info.ctime = mddev->ctime;
4946 info.level = mddev->level;
4947 info.size = mddev->dev_sectors / 2;
4948 if (info.size != mddev->dev_sectors / 2) /* overflow */
4951 info.raid_disks = mddev->raid_disks;
4952 info.md_minor = mddev->md_minor;
4953 info.not_persistent= !mddev->persistent;
4955 info.utime = mddev->utime;
4958 info.state = (1<<MD_SB_CLEAN);
4959 if (mddev->bitmap && mddev->bitmap_info.offset)
4960 info.state = (1<<MD_SB_BITMAP_PRESENT);
4961 info.active_disks = insync;
4962 info.working_disks = working;
4963 info.failed_disks = failed;
4964 info.spare_disks = spare;
4966 info.layout = mddev->layout;
4967 info.chunk_size = mddev->chunk_sectors << 9;
4969 if (copy_to_user(arg, &info, sizeof(info)))
4975 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4977 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4978 char *ptr, *buf = NULL;
4981 if (md_allow_write(mddev))
4982 file = kmalloc(sizeof(*file), GFP_NOIO);
4984 file = kmalloc(sizeof(*file), GFP_KERNEL);
4989 /* bitmap disabled, zero the first byte and copy out */
4990 if (!mddev->bitmap || !mddev->bitmap->file) {
4991 file->pathname[0] = '\0';
4995 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4999 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5003 strcpy(file->pathname, ptr);
5007 if (copy_to_user(arg, file, sizeof(*file)))
5015 static int get_disk_info(mddev_t * mddev, void __user * arg)
5017 mdu_disk_info_t info;
5020 if (copy_from_user(&info, arg, sizeof(info)))
5023 rdev = find_rdev_nr(mddev, info.number);
5025 info.major = MAJOR(rdev->bdev->bd_dev);
5026 info.minor = MINOR(rdev->bdev->bd_dev);
5027 info.raid_disk = rdev->raid_disk;
5029 if (test_bit(Faulty, &rdev->flags))
5030 info.state |= (1<<MD_DISK_FAULTY);
5031 else if (test_bit(In_sync, &rdev->flags)) {
5032 info.state |= (1<<MD_DISK_ACTIVE);
5033 info.state |= (1<<MD_DISK_SYNC);
5035 if (test_bit(WriteMostly, &rdev->flags))
5036 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5038 info.major = info.minor = 0;
5039 info.raid_disk = -1;
5040 info.state = (1<<MD_DISK_REMOVED);
5043 if (copy_to_user(arg, &info, sizeof(info)))
5049 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5051 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5053 dev_t dev = MKDEV(info->major,info->minor);
5055 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5058 if (!mddev->raid_disks) {
5060 /* expecting a device which has a superblock */
5061 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5064 "md: md_import_device returned %ld\n",
5066 return PTR_ERR(rdev);
5068 if (!list_empty(&mddev->disks)) {
5069 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5070 mdk_rdev_t, same_set);
5071 err = super_types[mddev->major_version]
5072 .load_super(rdev, rdev0, mddev->minor_version);
5075 "md: %s has different UUID to %s\n",
5076 bdevname(rdev->bdev,b),
5077 bdevname(rdev0->bdev,b2));
5082 err = bind_rdev_to_array(rdev, mddev);
5089 * add_new_disk can be used once the array is assembled
5090 * to add "hot spares". They must already have a superblock
5095 if (!mddev->pers->hot_add_disk) {
5097 "%s: personality does not support diskops!\n",
5101 if (mddev->persistent)
5102 rdev = md_import_device(dev, mddev->major_version,
5103 mddev->minor_version);
5105 rdev = md_import_device(dev, -1, -1);
5108 "md: md_import_device returned %ld\n",
5110 return PTR_ERR(rdev);
5112 /* set save_raid_disk if appropriate */
5113 if (!mddev->persistent) {
5114 if (info->state & (1<<MD_DISK_SYNC) &&
5115 info->raid_disk < mddev->raid_disks)
5116 rdev->raid_disk = info->raid_disk;
5118 rdev->raid_disk = -1;
5120 super_types[mddev->major_version].
5121 validate_super(mddev, rdev);
5122 rdev->saved_raid_disk = rdev->raid_disk;
5124 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5125 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5126 set_bit(WriteMostly, &rdev->flags);
5128 clear_bit(WriteMostly, &rdev->flags);
5130 rdev->raid_disk = -1;
5131 err = bind_rdev_to_array(rdev, mddev);
5132 if (!err && !mddev->pers->hot_remove_disk) {
5133 /* If there is hot_add_disk but no hot_remove_disk
5134 * then added disks for geometry changes,
5135 * and should be added immediately.
5137 super_types[mddev->major_version].
5138 validate_super(mddev, rdev);
5139 err = mddev->pers->hot_add_disk(mddev, rdev);
5141 unbind_rdev_from_array(rdev);
5146 sysfs_notify_dirent(rdev->sysfs_state);
5148 md_update_sb(mddev, 1);
5149 if (mddev->degraded)
5150 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5151 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5152 md_wakeup_thread(mddev->thread);
5156 /* otherwise, add_new_disk is only allowed
5157 * for major_version==0 superblocks
5159 if (mddev->major_version != 0) {
5160 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5165 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5167 rdev = md_import_device(dev, -1, 0);
5170 "md: error, md_import_device() returned %ld\n",
5172 return PTR_ERR(rdev);
5174 rdev->desc_nr = info->number;
5175 if (info->raid_disk < mddev->raid_disks)
5176 rdev->raid_disk = info->raid_disk;
5178 rdev->raid_disk = -1;
5180 if (rdev->raid_disk < mddev->raid_disks)
5181 if (info->state & (1<<MD_DISK_SYNC))
5182 set_bit(In_sync, &rdev->flags);
5184 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5185 set_bit(WriteMostly, &rdev->flags);
5187 if (!mddev->persistent) {
5188 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5189 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5191 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5192 rdev->sectors = rdev->sb_start;
5194 err = bind_rdev_to_array(rdev, mddev);
5204 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5206 char b[BDEVNAME_SIZE];
5209 rdev = find_rdev(mddev, dev);
5213 if (rdev->raid_disk >= 0)
5216 kick_rdev_from_array(rdev);
5217 md_update_sb(mddev, 1);
5218 md_new_event(mddev);
5222 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5223 bdevname(rdev->bdev,b), mdname(mddev));
5227 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5229 char b[BDEVNAME_SIZE];
5236 if (mddev->major_version != 0) {
5237 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5238 " version-0 superblocks.\n",
5242 if (!mddev->pers->hot_add_disk) {
5244 "%s: personality does not support diskops!\n",
5249 rdev = md_import_device(dev, -1, 0);
5252 "md: error, md_import_device() returned %ld\n",
5257 if (mddev->persistent)
5258 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5260 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5262 rdev->sectors = rdev->sb_start;
5264 if (test_bit(Faulty, &rdev->flags)) {
5266 "md: can not hot-add faulty %s disk to %s!\n",
5267 bdevname(rdev->bdev,b), mdname(mddev));
5271 clear_bit(In_sync, &rdev->flags);
5273 rdev->saved_raid_disk = -1;
5274 err = bind_rdev_to_array(rdev, mddev);
5279 * The rest should better be atomic, we can have disk failures
5280 * noticed in interrupt contexts ...
5283 rdev->raid_disk = -1;
5285 md_update_sb(mddev, 1);
5288 * Kick recovery, maybe this spare has to be added to the
5289 * array immediately.
5291 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5292 md_wakeup_thread(mddev->thread);
5293 md_new_event(mddev);
5301 static int set_bitmap_file(mddev_t *mddev, int fd)
5306 if (!mddev->pers->quiesce)
5308 if (mddev->recovery || mddev->sync_thread)
5310 /* we should be able to change the bitmap.. */
5316 return -EEXIST; /* cannot add when bitmap is present */
5317 mddev->bitmap_info.file = fget(fd);
5319 if (mddev->bitmap_info.file == NULL) {
5320 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5325 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5327 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5329 fput(mddev->bitmap_info.file);
5330 mddev->bitmap_info.file = NULL;
5333 mddev->bitmap_info.offset = 0; /* file overrides offset */
5334 } else if (mddev->bitmap == NULL)
5335 return -ENOENT; /* cannot remove what isn't there */
5338 mddev->pers->quiesce(mddev, 1);
5340 err = bitmap_create(mddev);
5341 if (fd < 0 || err) {
5342 bitmap_destroy(mddev);
5343 fd = -1; /* make sure to put the file */
5345 mddev->pers->quiesce(mddev, 0);
5348 if (mddev->bitmap_info.file) {
5349 restore_bitmap_write_access(mddev->bitmap_info.file);
5350 fput(mddev->bitmap_info.file);
5352 mddev->bitmap_info.file = NULL;
5359 * set_array_info is used two different ways
5360 * The original usage is when creating a new array.
5361 * In this usage, raid_disks is > 0 and it together with
5362 * level, size, not_persistent,layout,chunksize determine the
5363 * shape of the array.
5364 * This will always create an array with a type-0.90.0 superblock.
5365 * The newer usage is when assembling an array.
5366 * In this case raid_disks will be 0, and the major_version field is
5367 * use to determine which style super-blocks are to be found on the devices.
5368 * The minor and patch _version numbers are also kept incase the
5369 * super_block handler wishes to interpret them.
5371 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5374 if (info->raid_disks == 0) {
5375 /* just setting version number for superblock loading */
5376 if (info->major_version < 0 ||
5377 info->major_version >= ARRAY_SIZE(super_types) ||
5378 super_types[info->major_version].name == NULL) {
5379 /* maybe try to auto-load a module? */
5381 "md: superblock version %d not known\n",
5382 info->major_version);
5385 mddev->major_version = info->major_version;
5386 mddev->minor_version = info->minor_version;
5387 mddev->patch_version = info->patch_version;
5388 mddev->persistent = !info->not_persistent;
5389 /* ensure mddev_put doesn't delete this now that there
5390 * is some minimal configuration.
5392 mddev->ctime = get_seconds();
5395 mddev->major_version = MD_MAJOR_VERSION;
5396 mddev->minor_version = MD_MINOR_VERSION;
5397 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5398 mddev->ctime = get_seconds();
5400 mddev->level = info->level;
5401 mddev->clevel[0] = 0;
5402 mddev->dev_sectors = 2 * (sector_t)info->size;
5403 mddev->raid_disks = info->raid_disks;
5404 /* don't set md_minor, it is determined by which /dev/md* was
5407 if (info->state & (1<<MD_SB_CLEAN))
5408 mddev->recovery_cp = MaxSector;
5410 mddev->recovery_cp = 0;
5411 mddev->persistent = ! info->not_persistent;
5412 mddev->external = 0;
5414 mddev->layout = info->layout;
5415 mddev->chunk_sectors = info->chunk_size >> 9;
5417 mddev->max_disks = MD_SB_DISKS;
5419 if (mddev->persistent)
5421 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5423 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5424 mddev->bitmap_info.offset = 0;
5426 mddev->reshape_position = MaxSector;
5429 * Generate a 128 bit UUID
5431 get_random_bytes(mddev->uuid, 16);
5433 mddev->new_level = mddev->level;
5434 mddev->new_chunk_sectors = mddev->chunk_sectors;
5435 mddev->new_layout = mddev->layout;
5436 mddev->delta_disks = 0;
5441 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5443 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5445 if (mddev->external_size)
5448 mddev->array_sectors = array_sectors;
5450 EXPORT_SYMBOL(md_set_array_sectors);
5452 static int update_size(mddev_t *mddev, sector_t num_sectors)
5456 int fit = (num_sectors == 0);
5458 if (mddev->pers->resize == NULL)
5460 /* The "num_sectors" is the number of sectors of each device that
5461 * is used. This can only make sense for arrays with redundancy.
5462 * linear and raid0 always use whatever space is available. We can only
5463 * consider changing this number if no resync or reconstruction is
5464 * happening, and if the new size is acceptable. It must fit before the
5465 * sb_start or, if that is <data_offset, it must fit before the size
5466 * of each device. If num_sectors is zero, we find the largest size
5470 if (mddev->sync_thread)
5473 /* Sorry, cannot grow a bitmap yet, just remove it,
5477 list_for_each_entry(rdev, &mddev->disks, same_set) {
5478 sector_t avail = rdev->sectors;
5480 if (fit && (num_sectors == 0 || num_sectors > avail))
5481 num_sectors = avail;
5482 if (avail < num_sectors)
5485 rv = mddev->pers->resize(mddev, num_sectors);
5487 revalidate_disk(mddev->gendisk);
5491 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5494 /* change the number of raid disks */
5495 if (mddev->pers->check_reshape == NULL)
5497 if (raid_disks <= 0 ||
5498 (mddev->max_disks && raid_disks >= mddev->max_disks))
5500 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5502 mddev->delta_disks = raid_disks - mddev->raid_disks;
5504 rv = mddev->pers->check_reshape(mddev);
5510 * update_array_info is used to change the configuration of an
5512 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5513 * fields in the info are checked against the array.
5514 * Any differences that cannot be handled will cause an error.
5515 * Normally, only one change can be managed at a time.
5517 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5523 /* calculate expected state,ignoring low bits */
5524 if (mddev->bitmap && mddev->bitmap_info.offset)
5525 state |= (1 << MD_SB_BITMAP_PRESENT);
5527 if (mddev->major_version != info->major_version ||
5528 mddev->minor_version != info->minor_version ||
5529 /* mddev->patch_version != info->patch_version || */
5530 mddev->ctime != info->ctime ||
5531 mddev->level != info->level ||
5532 /* mddev->layout != info->layout || */
5533 !mddev->persistent != info->not_persistent||
5534 mddev->chunk_sectors != info->chunk_size >> 9 ||
5535 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5536 ((state^info->state) & 0xfffffe00)
5539 /* Check there is only one change */
5540 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5542 if (mddev->raid_disks != info->raid_disks)
5544 if (mddev->layout != info->layout)
5546 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5553 if (mddev->layout != info->layout) {
5555 * we don't need to do anything at the md level, the
5556 * personality will take care of it all.
5558 if (mddev->pers->check_reshape == NULL)
5561 mddev->new_layout = info->layout;
5562 rv = mddev->pers->check_reshape(mddev);
5564 mddev->new_layout = mddev->layout;
5568 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5569 rv = update_size(mddev, (sector_t)info->size * 2);
5571 if (mddev->raid_disks != info->raid_disks)
5572 rv = update_raid_disks(mddev, info->raid_disks);
5574 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5575 if (mddev->pers->quiesce == NULL)
5577 if (mddev->recovery || mddev->sync_thread)
5579 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5580 /* add the bitmap */
5583 if (mddev->bitmap_info.default_offset == 0)
5585 mddev->bitmap_info.offset =
5586 mddev->bitmap_info.default_offset;
5587 mddev->pers->quiesce(mddev, 1);
5588 rv = bitmap_create(mddev);
5590 bitmap_destroy(mddev);
5591 mddev->pers->quiesce(mddev, 0);
5593 /* remove the bitmap */
5596 if (mddev->bitmap->file)
5598 mddev->pers->quiesce(mddev, 1);
5599 bitmap_destroy(mddev);
5600 mddev->pers->quiesce(mddev, 0);
5601 mddev->bitmap_info.offset = 0;
5604 md_update_sb(mddev, 1);
5608 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5612 if (mddev->pers == NULL)
5615 rdev = find_rdev(mddev, dev);
5619 md_error(mddev, rdev);
5624 * We have a problem here : there is no easy way to give a CHS
5625 * virtual geometry. We currently pretend that we have a 2 heads
5626 * 4 sectors (with a BIG number of cylinders...). This drives
5627 * dosfs just mad... ;-)
5629 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5631 mddev_t *mddev = bdev->bd_disk->private_data;
5635 geo->cylinders = mddev->array_sectors / 8;
5639 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5640 unsigned int cmd, unsigned long arg)
5643 void __user *argp = (void __user *)arg;
5644 mddev_t *mddev = NULL;
5647 if (!capable(CAP_SYS_ADMIN))
5651 * Commands dealing with the RAID driver but not any
5657 err = get_version(argp);
5660 case PRINT_RAID_DEBUG:
5668 autostart_arrays(arg);
5675 * Commands creating/starting a new array:
5678 mddev = bdev->bd_disk->private_data;
5685 err = mddev_lock(mddev);
5688 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5695 case SET_ARRAY_INFO:
5697 mdu_array_info_t info;
5699 memset(&info, 0, sizeof(info));
5700 else if (copy_from_user(&info, argp, sizeof(info))) {
5705 err = update_array_info(mddev, &info);
5707 printk(KERN_WARNING "md: couldn't update"
5708 " array info. %d\n", err);
5713 if (!list_empty(&mddev->disks)) {
5715 "md: array %s already has disks!\n",
5720 if (mddev->raid_disks) {
5722 "md: array %s already initialised!\n",
5727 err = set_array_info(mddev, &info);
5729 printk(KERN_WARNING "md: couldn't set"
5730 " array info. %d\n", err);
5740 * Commands querying/configuring an existing array:
5742 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5743 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5744 if ((!mddev->raid_disks && !mddev->external)
5745 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5746 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5747 && cmd != GET_BITMAP_FILE) {
5753 * Commands even a read-only array can execute:
5757 case GET_ARRAY_INFO:
5758 err = get_array_info(mddev, argp);
5761 case GET_BITMAP_FILE:
5762 err = get_bitmap_file(mddev, argp);
5766 err = get_disk_info(mddev, argp);
5769 case RESTART_ARRAY_RW:
5770 err = restart_array(mddev);
5774 err = do_md_stop(mddev, 0, 1);
5778 err = md_set_readonly(mddev, 1);
5782 if (get_user(ro, (int __user *)(arg))) {
5788 /* if the bdev is going readonly the value of mddev->ro
5789 * does not matter, no writes are coming
5794 /* are we are already prepared for writes? */
5798 /* transitioning to readauto need only happen for
5799 * arrays that call md_write_start
5802 err = restart_array(mddev);
5805 set_disk_ro(mddev->gendisk, 0);
5812 * The remaining ioctls are changing the state of the
5813 * superblock, so we do not allow them on read-only arrays.
5814 * However non-MD ioctls (e.g. get-size) will still come through
5815 * here and hit the 'default' below, so only disallow
5816 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5818 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5819 if (mddev->ro == 2) {
5821 sysfs_notify_dirent(mddev->sysfs_state);
5822 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5823 md_wakeup_thread(mddev->thread);
5834 mdu_disk_info_t info;
5835 if (copy_from_user(&info, argp, sizeof(info)))
5838 err = add_new_disk(mddev, &info);
5842 case HOT_REMOVE_DISK:
5843 err = hot_remove_disk(mddev, new_decode_dev(arg));
5847 err = hot_add_disk(mddev, new_decode_dev(arg));
5850 case SET_DISK_FAULTY:
5851 err = set_disk_faulty(mddev, new_decode_dev(arg));
5855 err = do_md_run(mddev);
5858 case SET_BITMAP_FILE:
5859 err = set_bitmap_file(mddev, (int)arg);
5869 if (mddev->hold_active == UNTIL_IOCTL &&
5871 mddev->hold_active = 0;
5872 mddev_unlock(mddev);
5881 #ifdef CONFIG_COMPAT
5882 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5883 unsigned int cmd, unsigned long arg)
5886 case HOT_REMOVE_DISK:
5888 case SET_DISK_FAULTY:
5889 case SET_BITMAP_FILE:
5890 /* These take in integer arg, do not convert */
5893 arg = (unsigned long)compat_ptr(arg);
5897 return md_ioctl(bdev, mode, cmd, arg);
5899 #endif /* CONFIG_COMPAT */
5901 static int md_open(struct block_device *bdev, fmode_t mode)
5904 * Succeed if we can lock the mddev, which confirms that
5905 * it isn't being stopped right now.
5907 mddev_t *mddev = mddev_find(bdev->bd_dev);
5910 if (mddev->gendisk != bdev->bd_disk) {
5911 /* we are racing with mddev_put which is discarding this
5915 /* Wait until bdev->bd_disk is definitely gone */
5916 flush_scheduled_work();
5917 /* Then retry the open from the top */
5918 return -ERESTARTSYS;
5920 BUG_ON(mddev != bdev->bd_disk->private_data);
5922 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5926 atomic_inc(&mddev->openers);
5927 mutex_unlock(&mddev->open_mutex);
5929 check_disk_size_change(mddev->gendisk, bdev);
5934 static int md_release(struct gendisk *disk, fmode_t mode)
5936 mddev_t *mddev = disk->private_data;
5939 atomic_dec(&mddev->openers);
5944 static const struct block_device_operations md_fops =
5946 .owner = THIS_MODULE,
5948 .release = md_release,
5950 #ifdef CONFIG_COMPAT
5951 .compat_ioctl = md_compat_ioctl,
5953 .getgeo = md_getgeo,
5956 static int md_thread(void * arg)
5958 mdk_thread_t *thread = arg;
5961 * md_thread is a 'system-thread', it's priority should be very
5962 * high. We avoid resource deadlocks individually in each
5963 * raid personality. (RAID5 does preallocation) We also use RR and
5964 * the very same RT priority as kswapd, thus we will never get
5965 * into a priority inversion deadlock.
5967 * we definitely have to have equal or higher priority than
5968 * bdflush, otherwise bdflush will deadlock if there are too
5969 * many dirty RAID5 blocks.
5972 allow_signal(SIGKILL);
5973 while (!kthread_should_stop()) {
5975 /* We need to wait INTERRUPTIBLE so that
5976 * we don't add to the load-average.
5977 * That means we need to be sure no signals are
5980 if (signal_pending(current))
5981 flush_signals(current);
5983 wait_event_interruptible_timeout
5985 test_bit(THREAD_WAKEUP, &thread->flags)
5986 || kthread_should_stop(),
5989 clear_bit(THREAD_WAKEUP, &thread->flags);
5991 thread->run(thread->mddev);
5997 void md_wakeup_thread(mdk_thread_t *thread)
6000 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6001 set_bit(THREAD_WAKEUP, &thread->flags);
6002 wake_up(&thread->wqueue);
6006 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6009 mdk_thread_t *thread;
6011 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6015 init_waitqueue_head(&thread->wqueue);
6018 thread->mddev = mddev;
6019 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6020 thread->tsk = kthread_run(md_thread, thread,
6022 mdname(thread->mddev),
6023 name ?: mddev->pers->name);
6024 if (IS_ERR(thread->tsk)) {
6031 void md_unregister_thread(mdk_thread_t *thread)
6035 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6037 kthread_stop(thread->tsk);
6041 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6048 if (!rdev || test_bit(Faulty, &rdev->flags))
6051 if (mddev->external)
6052 set_bit(Blocked, &rdev->flags);
6054 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6056 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6057 __builtin_return_address(0),__builtin_return_address(1),
6058 __builtin_return_address(2),__builtin_return_address(3));
6062 if (!mddev->pers->error_handler)
6064 mddev->pers->error_handler(mddev,rdev);
6065 if (mddev->degraded)
6066 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6067 sysfs_notify_dirent(rdev->sysfs_state);
6068 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6069 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6070 md_wakeup_thread(mddev->thread);
6071 md_new_event_inintr(mddev);
6074 /* seq_file implementation /proc/mdstat */
6076 static void status_unused(struct seq_file *seq)
6081 seq_printf(seq, "unused devices: ");
6083 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6084 char b[BDEVNAME_SIZE];
6086 seq_printf(seq, "%s ",
6087 bdevname(rdev->bdev,b));
6090 seq_printf(seq, "<none>");
6092 seq_printf(seq, "\n");
6096 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6098 sector_t max_sectors, resync, res;
6099 unsigned long dt, db;
6102 unsigned int per_milli;
6104 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6106 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6107 max_sectors = mddev->resync_max_sectors;
6109 max_sectors = mddev->dev_sectors;
6112 * Should not happen.
6118 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6119 * in a sector_t, and (max_sectors>>scale) will fit in a
6120 * u32, as those are the requirements for sector_div.
6121 * Thus 'scale' must be at least 10
6124 if (sizeof(sector_t) > sizeof(unsigned long)) {
6125 while ( max_sectors/2 > (1ULL<<(scale+32)))
6128 res = (resync>>scale)*1000;
6129 sector_div(res, (u32)((max_sectors>>scale)+1));
6133 int i, x = per_milli/50, y = 20-x;
6134 seq_printf(seq, "[");
6135 for (i = 0; i < x; i++)
6136 seq_printf(seq, "=");
6137 seq_printf(seq, ">");
6138 for (i = 0; i < y; i++)
6139 seq_printf(seq, ".");
6140 seq_printf(seq, "] ");
6142 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6143 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6145 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6147 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6148 "resync" : "recovery"))),
6149 per_milli/10, per_milli % 10,
6150 (unsigned long long) resync/2,
6151 (unsigned long long) max_sectors/2);
6154 * dt: time from mark until now
6155 * db: blocks written from mark until now
6156 * rt: remaining time
6158 * rt is a sector_t, so could be 32bit or 64bit.
6159 * So we divide before multiply in case it is 32bit and close
6161 * We scale the divisor (db) by 32 to avoid loosing precision
6162 * near the end of resync when the number of remaining sectors
6164 * We then divide rt by 32 after multiplying by db to compensate.
6165 * The '+1' avoids division by zero if db is very small.
6167 dt = ((jiffies - mddev->resync_mark) / HZ);
6169 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6170 - mddev->resync_mark_cnt;
6172 rt = max_sectors - resync; /* number of remaining sectors */
6173 sector_div(rt, db/32+1);
6177 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6178 ((unsigned long)rt % 60)/6);
6180 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6183 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6185 struct list_head *tmp;
6195 spin_lock(&all_mddevs_lock);
6196 list_for_each(tmp,&all_mddevs)
6198 mddev = list_entry(tmp, mddev_t, all_mddevs);
6200 spin_unlock(&all_mddevs_lock);
6203 spin_unlock(&all_mddevs_lock);
6205 return (void*)2;/* tail */
6209 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6211 struct list_head *tmp;
6212 mddev_t *next_mddev, *mddev = v;
6218 spin_lock(&all_mddevs_lock);
6220 tmp = all_mddevs.next;
6222 tmp = mddev->all_mddevs.next;
6223 if (tmp != &all_mddevs)
6224 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6226 next_mddev = (void*)2;
6229 spin_unlock(&all_mddevs_lock);
6237 static void md_seq_stop(struct seq_file *seq, void *v)
6241 if (mddev && v != (void*)1 && v != (void*)2)
6245 struct mdstat_info {
6249 static int md_seq_show(struct seq_file *seq, void *v)
6254 struct mdstat_info *mi = seq->private;
6255 struct bitmap *bitmap;
6257 if (v == (void*)1) {
6258 struct mdk_personality *pers;
6259 seq_printf(seq, "Personalities : ");
6260 spin_lock(&pers_lock);
6261 list_for_each_entry(pers, &pers_list, list)
6262 seq_printf(seq, "[%s] ", pers->name);
6264 spin_unlock(&pers_lock);
6265 seq_printf(seq, "\n");
6266 mi->event = atomic_read(&md_event_count);
6269 if (v == (void*)2) {
6274 if (mddev_lock(mddev) < 0)
6277 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6278 seq_printf(seq, "%s : %sactive", mdname(mddev),
6279 mddev->pers ? "" : "in");
6282 seq_printf(seq, " (read-only)");
6284 seq_printf(seq, " (auto-read-only)");
6285 seq_printf(seq, " %s", mddev->pers->name);
6289 list_for_each_entry(rdev, &mddev->disks, same_set) {
6290 char b[BDEVNAME_SIZE];
6291 seq_printf(seq, " %s[%d]",
6292 bdevname(rdev->bdev,b), rdev->desc_nr);
6293 if (test_bit(WriteMostly, &rdev->flags))
6294 seq_printf(seq, "(W)");
6295 if (test_bit(Faulty, &rdev->flags)) {
6296 seq_printf(seq, "(F)");
6298 } else if (rdev->raid_disk < 0)
6299 seq_printf(seq, "(S)"); /* spare */
6300 sectors += rdev->sectors;
6303 if (!list_empty(&mddev->disks)) {
6305 seq_printf(seq, "\n %llu blocks",
6306 (unsigned long long)
6307 mddev->array_sectors / 2);
6309 seq_printf(seq, "\n %llu blocks",
6310 (unsigned long long)sectors / 2);
6312 if (mddev->persistent) {
6313 if (mddev->major_version != 0 ||
6314 mddev->minor_version != 90) {
6315 seq_printf(seq," super %d.%d",
6316 mddev->major_version,
6317 mddev->minor_version);
6319 } else if (mddev->external)
6320 seq_printf(seq, " super external:%s",
6321 mddev->metadata_type);
6323 seq_printf(seq, " super non-persistent");
6326 mddev->pers->status(seq, mddev);
6327 seq_printf(seq, "\n ");
6328 if (mddev->pers->sync_request) {
6329 if (mddev->curr_resync > 2) {
6330 status_resync(seq, mddev);
6331 seq_printf(seq, "\n ");
6332 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6333 seq_printf(seq, "\tresync=DELAYED\n ");
6334 else if (mddev->recovery_cp < MaxSector)
6335 seq_printf(seq, "\tresync=PENDING\n ");
6338 seq_printf(seq, "\n ");
6340 if ((bitmap = mddev->bitmap)) {
6341 unsigned long chunk_kb;
6342 unsigned long flags;
6343 spin_lock_irqsave(&bitmap->lock, flags);
6344 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6345 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6347 bitmap->pages - bitmap->missing_pages,
6349 (bitmap->pages - bitmap->missing_pages)
6350 << (PAGE_SHIFT - 10),
6351 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6352 chunk_kb ? "KB" : "B");
6354 seq_printf(seq, ", file: ");
6355 seq_path(seq, &bitmap->file->f_path, " \t\n");
6358 seq_printf(seq, "\n");
6359 spin_unlock_irqrestore(&bitmap->lock, flags);
6362 seq_printf(seq, "\n");
6364 mddev_unlock(mddev);
6369 static const struct seq_operations md_seq_ops = {
6370 .start = md_seq_start,
6371 .next = md_seq_next,
6372 .stop = md_seq_stop,
6373 .show = md_seq_show,
6376 static int md_seq_open(struct inode *inode, struct file *file)
6379 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6383 error = seq_open(file, &md_seq_ops);
6387 struct seq_file *p = file->private_data;
6389 mi->event = atomic_read(&md_event_count);
6394 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6396 struct seq_file *m = filp->private_data;
6397 struct mdstat_info *mi = m->private;
6400 poll_wait(filp, &md_event_waiters, wait);
6402 /* always allow read */
6403 mask = POLLIN | POLLRDNORM;
6405 if (mi->event != atomic_read(&md_event_count))
6406 mask |= POLLERR | POLLPRI;
6410 static const struct file_operations md_seq_fops = {
6411 .owner = THIS_MODULE,
6412 .open = md_seq_open,
6414 .llseek = seq_lseek,
6415 .release = seq_release_private,
6416 .poll = mdstat_poll,
6419 int register_md_personality(struct mdk_personality *p)
6421 spin_lock(&pers_lock);
6422 list_add_tail(&p->list, &pers_list);
6423 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6424 spin_unlock(&pers_lock);
6428 int unregister_md_personality(struct mdk_personality *p)
6430 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6431 spin_lock(&pers_lock);
6432 list_del_init(&p->list);
6433 spin_unlock(&pers_lock);
6437 static int is_mddev_idle(mddev_t *mddev, int init)
6445 rdev_for_each_rcu(rdev, mddev) {
6446 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6447 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6448 (int)part_stat_read(&disk->part0, sectors[1]) -
6449 atomic_read(&disk->sync_io);
6450 /* sync IO will cause sync_io to increase before the disk_stats
6451 * as sync_io is counted when a request starts, and
6452 * disk_stats is counted when it completes.
6453 * So resync activity will cause curr_events to be smaller than
6454 * when there was no such activity.
6455 * non-sync IO will cause disk_stat to increase without
6456 * increasing sync_io so curr_events will (eventually)
6457 * be larger than it was before. Once it becomes
6458 * substantially larger, the test below will cause
6459 * the array to appear non-idle, and resync will slow
6461 * If there is a lot of outstanding resync activity when
6462 * we set last_event to curr_events, then all that activity
6463 * completing might cause the array to appear non-idle
6464 * and resync will be slowed down even though there might
6465 * not have been non-resync activity. This will only
6466 * happen once though. 'last_events' will soon reflect
6467 * the state where there is little or no outstanding
6468 * resync requests, and further resync activity will
6469 * always make curr_events less than last_events.
6472 if (init || curr_events - rdev->last_events > 64) {
6473 rdev->last_events = curr_events;
6481 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6483 /* another "blocks" (512byte) blocks have been synced */
6484 atomic_sub(blocks, &mddev->recovery_active);
6485 wake_up(&mddev->recovery_wait);
6487 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6488 md_wakeup_thread(mddev->thread);
6489 // stop recovery, signal do_sync ....
6494 /* md_write_start(mddev, bi)
6495 * If we need to update some array metadata (e.g. 'active' flag
6496 * in superblock) before writing, schedule a superblock update
6497 * and wait for it to complete.
6499 void md_write_start(mddev_t *mddev, struct bio *bi)
6502 if (bio_data_dir(bi) != WRITE)
6505 BUG_ON(mddev->ro == 1);
6506 if (mddev->ro == 2) {
6507 /* need to switch to read/write */
6509 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6510 md_wakeup_thread(mddev->thread);
6511 md_wakeup_thread(mddev->sync_thread);
6514 atomic_inc(&mddev->writes_pending);
6515 if (mddev->safemode == 1)
6516 mddev->safemode = 0;
6517 if (mddev->in_sync) {
6518 spin_lock_irq(&mddev->write_lock);
6519 if (mddev->in_sync) {
6521 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6522 md_wakeup_thread(mddev->thread);
6525 spin_unlock_irq(&mddev->write_lock);
6528 sysfs_notify_dirent(mddev->sysfs_state);
6529 wait_event(mddev->sb_wait,
6530 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6531 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6534 void md_write_end(mddev_t *mddev)
6536 if (atomic_dec_and_test(&mddev->writes_pending)) {
6537 if (mddev->safemode == 2)
6538 md_wakeup_thread(mddev->thread);
6539 else if (mddev->safemode_delay)
6540 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6544 /* md_allow_write(mddev)
6545 * Calling this ensures that the array is marked 'active' so that writes
6546 * may proceed without blocking. It is important to call this before
6547 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6548 * Must be called with mddev_lock held.
6550 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6551 * is dropped, so return -EAGAIN after notifying userspace.
6553 int md_allow_write(mddev_t *mddev)
6559 if (!mddev->pers->sync_request)
6562 spin_lock_irq(&mddev->write_lock);
6563 if (mddev->in_sync) {
6565 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6566 if (mddev->safemode_delay &&
6567 mddev->safemode == 0)
6568 mddev->safemode = 1;
6569 spin_unlock_irq(&mddev->write_lock);
6570 md_update_sb(mddev, 0);
6571 sysfs_notify_dirent(mddev->sysfs_state);
6573 spin_unlock_irq(&mddev->write_lock);
6575 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6580 EXPORT_SYMBOL_GPL(md_allow_write);
6582 #define SYNC_MARKS 10
6583 #define SYNC_MARK_STEP (3*HZ)
6584 void md_do_sync(mddev_t *mddev)
6587 unsigned int currspeed = 0,
6589 sector_t max_sectors,j, io_sectors;
6590 unsigned long mark[SYNC_MARKS];
6591 sector_t mark_cnt[SYNC_MARKS];
6593 struct list_head *tmp;
6594 sector_t last_check;
6599 /* just incase thread restarts... */
6600 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6602 if (mddev->ro) /* never try to sync a read-only array */
6605 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6606 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6607 desc = "data-check";
6608 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6609 desc = "requested-resync";
6612 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6617 /* we overload curr_resync somewhat here.
6618 * 0 == not engaged in resync at all
6619 * 2 == checking that there is no conflict with another sync
6620 * 1 == like 2, but have yielded to allow conflicting resync to
6622 * other == active in resync - this many blocks
6624 * Before starting a resync we must have set curr_resync to
6625 * 2, and then checked that every "conflicting" array has curr_resync
6626 * less than ours. When we find one that is the same or higher
6627 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6628 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6629 * This will mean we have to start checking from the beginning again.
6634 mddev->curr_resync = 2;
6637 if (kthread_should_stop())
6638 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6640 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6642 for_each_mddev(mddev2, tmp) {
6643 if (mddev2 == mddev)
6645 if (!mddev->parallel_resync
6646 && mddev2->curr_resync
6647 && match_mddev_units(mddev, mddev2)) {
6649 if (mddev < mddev2 && mddev->curr_resync == 2) {
6650 /* arbitrarily yield */
6651 mddev->curr_resync = 1;
6652 wake_up(&resync_wait);
6654 if (mddev > mddev2 && mddev->curr_resync == 1)
6655 /* no need to wait here, we can wait the next
6656 * time 'round when curr_resync == 2
6659 /* We need to wait 'interruptible' so as not to
6660 * contribute to the load average, and not to
6661 * be caught by 'softlockup'
6663 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6664 if (!kthread_should_stop() &&
6665 mddev2->curr_resync >= mddev->curr_resync) {
6666 printk(KERN_INFO "md: delaying %s of %s"
6667 " until %s has finished (they"
6668 " share one or more physical units)\n",
6669 desc, mdname(mddev), mdname(mddev2));
6671 if (signal_pending(current))
6672 flush_signals(current);
6674 finish_wait(&resync_wait, &wq);
6677 finish_wait(&resync_wait, &wq);
6680 } while (mddev->curr_resync < 2);
6683 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6684 /* resync follows the size requested by the personality,
6685 * which defaults to physical size, but can be virtual size
6687 max_sectors = mddev->resync_max_sectors;
6688 mddev->resync_mismatches = 0;
6689 /* we don't use the checkpoint if there's a bitmap */
6690 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6691 j = mddev->resync_min;
6692 else if (!mddev->bitmap)
6693 j = mddev->recovery_cp;
6695 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6696 max_sectors = mddev->dev_sectors;
6698 /* recovery follows the physical size of devices */
6699 max_sectors = mddev->dev_sectors;
6702 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6703 if (rdev->raid_disk >= 0 &&
6704 !test_bit(Faulty, &rdev->flags) &&
6705 !test_bit(In_sync, &rdev->flags) &&
6706 rdev->recovery_offset < j)
6707 j = rdev->recovery_offset;
6711 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6712 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6713 " %d KB/sec/disk.\n", speed_min(mddev));
6714 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6715 "(but not more than %d KB/sec) for %s.\n",
6716 speed_max(mddev), desc);
6718 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6721 for (m = 0; m < SYNC_MARKS; m++) {
6723 mark_cnt[m] = io_sectors;
6726 mddev->resync_mark = mark[last_mark];
6727 mddev->resync_mark_cnt = mark_cnt[last_mark];
6730 * Tune reconstruction:
6732 window = 32*(PAGE_SIZE/512);
6733 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6734 window/2,(unsigned long long) max_sectors/2);
6736 atomic_set(&mddev->recovery_active, 0);
6741 "md: resuming %s of %s from checkpoint.\n",
6742 desc, mdname(mddev));
6743 mddev->curr_resync = j;
6745 mddev->curr_resync_completed = mddev->curr_resync;
6747 while (j < max_sectors) {
6752 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6753 ((mddev->curr_resync > mddev->curr_resync_completed &&
6754 (mddev->curr_resync - mddev->curr_resync_completed)
6755 > (max_sectors >> 4)) ||
6756 (j - mddev->curr_resync_completed)*2
6757 >= mddev->resync_max - mddev->curr_resync_completed
6759 /* time to update curr_resync_completed */
6760 blk_unplug(mddev->queue);
6761 wait_event(mddev->recovery_wait,
6762 atomic_read(&mddev->recovery_active) == 0);
6763 mddev->curr_resync_completed =
6765 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6766 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6769 while (j >= mddev->resync_max && !kthread_should_stop()) {
6770 /* As this condition is controlled by user-space,
6771 * we can block indefinitely, so use '_interruptible'
6772 * to avoid triggering warnings.
6774 flush_signals(current); /* just in case */
6775 wait_event_interruptible(mddev->recovery_wait,
6776 mddev->resync_max > j
6777 || kthread_should_stop());
6780 if (kthread_should_stop())
6783 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6784 currspeed < speed_min(mddev));
6786 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6790 if (!skipped) { /* actual IO requested */
6791 io_sectors += sectors;
6792 atomic_add(sectors, &mddev->recovery_active);
6796 if (j>1) mddev->curr_resync = j;
6797 mddev->curr_mark_cnt = io_sectors;
6798 if (last_check == 0)
6799 /* this is the earliers that rebuilt will be
6800 * visible in /proc/mdstat
6802 md_new_event(mddev);
6804 if (last_check + window > io_sectors || j == max_sectors)
6807 last_check = io_sectors;
6809 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6813 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6815 int next = (last_mark+1) % SYNC_MARKS;
6817 mddev->resync_mark = mark[next];
6818 mddev->resync_mark_cnt = mark_cnt[next];
6819 mark[next] = jiffies;
6820 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6825 if (kthread_should_stop())
6830 * this loop exits only if either when we are slower than
6831 * the 'hard' speed limit, or the system was IO-idle for
6833 * the system might be non-idle CPU-wise, but we only care
6834 * about not overloading the IO subsystem. (things like an
6835 * e2fsck being done on the RAID array should execute fast)
6837 blk_unplug(mddev->queue);
6840 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6841 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6843 if (currspeed > speed_min(mddev)) {
6844 if ((currspeed > speed_max(mddev)) ||
6845 !is_mddev_idle(mddev, 0)) {
6851 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6853 * this also signals 'finished resyncing' to md_stop
6856 blk_unplug(mddev->queue);
6858 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6860 /* tell personality that we are finished */
6861 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6863 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6864 mddev->curr_resync > 2) {
6865 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6866 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6867 if (mddev->curr_resync >= mddev->recovery_cp) {
6869 "md: checkpointing %s of %s.\n",
6870 desc, mdname(mddev));
6871 mddev->recovery_cp = mddev->curr_resync;
6874 mddev->recovery_cp = MaxSector;
6876 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6877 mddev->curr_resync = MaxSector;
6879 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6880 if (rdev->raid_disk >= 0 &&
6881 mddev->delta_disks >= 0 &&
6882 !test_bit(Faulty, &rdev->flags) &&
6883 !test_bit(In_sync, &rdev->flags) &&
6884 rdev->recovery_offset < mddev->curr_resync)
6885 rdev->recovery_offset = mddev->curr_resync;
6889 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6892 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6893 /* We completed so min/max setting can be forgotten if used. */
6894 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6895 mddev->resync_min = 0;
6896 mddev->resync_max = MaxSector;
6897 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6898 mddev->resync_min = mddev->curr_resync_completed;
6899 mddev->curr_resync = 0;
6900 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6901 mddev->curr_resync_completed = 0;
6902 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6903 wake_up(&resync_wait);
6904 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6905 md_wakeup_thread(mddev->thread);
6910 * got a signal, exit.
6913 "md: md_do_sync() got signal ... exiting\n");
6914 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6918 EXPORT_SYMBOL_GPL(md_do_sync);
6921 static int remove_and_add_spares(mddev_t *mddev)
6926 mddev->curr_resync_completed = 0;
6928 list_for_each_entry(rdev, &mddev->disks, same_set)
6929 if (rdev->raid_disk >= 0 &&
6930 !test_bit(Blocked, &rdev->flags) &&
6931 (test_bit(Faulty, &rdev->flags) ||
6932 ! test_bit(In_sync, &rdev->flags)) &&
6933 atomic_read(&rdev->nr_pending)==0) {
6934 if (mddev->pers->hot_remove_disk(
6935 mddev, rdev->raid_disk)==0) {
6937 sprintf(nm,"rd%d", rdev->raid_disk);
6938 sysfs_remove_link(&mddev->kobj, nm);
6939 rdev->raid_disk = -1;
6943 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6944 list_for_each_entry(rdev, &mddev->disks, same_set) {
6945 if (rdev->raid_disk >= 0 &&
6946 !test_bit(In_sync, &rdev->flags) &&
6947 !test_bit(Blocked, &rdev->flags))
6949 if (rdev->raid_disk < 0
6950 && !test_bit(Faulty, &rdev->flags)) {
6951 rdev->recovery_offset = 0;
6953 hot_add_disk(mddev, rdev) == 0) {
6955 sprintf(nm, "rd%d", rdev->raid_disk);
6956 if (sysfs_create_link(&mddev->kobj,
6959 "md: cannot register "
6963 md_new_event(mddev);
6964 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6973 * This routine is regularly called by all per-raid-array threads to
6974 * deal with generic issues like resync and super-block update.
6975 * Raid personalities that don't have a thread (linear/raid0) do not
6976 * need this as they never do any recovery or update the superblock.
6978 * It does not do any resync itself, but rather "forks" off other threads
6979 * to do that as needed.
6980 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6981 * "->recovery" and create a thread at ->sync_thread.
6982 * When the thread finishes it sets MD_RECOVERY_DONE
6983 * and wakeups up this thread which will reap the thread and finish up.
6984 * This thread also removes any faulty devices (with nr_pending == 0).
6986 * The overall approach is:
6987 * 1/ if the superblock needs updating, update it.
6988 * 2/ If a recovery thread is running, don't do anything else.
6989 * 3/ If recovery has finished, clean up, possibly marking spares active.
6990 * 4/ If there are any faulty devices, remove them.
6991 * 5/ If array is degraded, try to add spares devices
6992 * 6/ If array has spares or is not in-sync, start a resync thread.
6994 void md_check_recovery(mddev_t *mddev)
7000 bitmap_daemon_work(mddev);
7005 if (signal_pending(current)) {
7006 if (mddev->pers->sync_request && !mddev->external) {
7007 printk(KERN_INFO "md: %s in immediate safe mode\n",
7009 mddev->safemode = 2;
7011 flush_signals(current);
7014 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7017 (mddev->flags && !mddev->external) ||
7018 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7019 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7020 (mddev->external == 0 && mddev->safemode == 1) ||
7021 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7022 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7026 if (mddev_trylock(mddev)) {
7030 /* Only thing we do on a ro array is remove
7033 remove_and_add_spares(mddev);
7034 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7038 if (!mddev->external) {
7040 spin_lock_irq(&mddev->write_lock);
7041 if (mddev->safemode &&
7042 !atomic_read(&mddev->writes_pending) &&
7044 mddev->recovery_cp == MaxSector) {
7047 if (mddev->persistent)
7048 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7050 if (mddev->safemode == 1)
7051 mddev->safemode = 0;
7052 spin_unlock_irq(&mddev->write_lock);
7054 sysfs_notify_dirent(mddev->sysfs_state);
7058 md_update_sb(mddev, 0);
7060 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7061 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7062 /* resync/recovery still happening */
7063 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7066 if (mddev->sync_thread) {
7067 /* resync has finished, collect result */
7068 md_unregister_thread(mddev->sync_thread);
7069 mddev->sync_thread = NULL;
7070 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7071 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7073 /* activate any spares */
7074 if (mddev->pers->spare_active(mddev))
7075 sysfs_notify(&mddev->kobj, NULL,
7078 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7079 mddev->pers->finish_reshape)
7080 mddev->pers->finish_reshape(mddev);
7081 md_update_sb(mddev, 1);
7083 /* if array is no-longer degraded, then any saved_raid_disk
7084 * information must be scrapped
7086 if (!mddev->degraded)
7087 list_for_each_entry(rdev, &mddev->disks, same_set)
7088 rdev->saved_raid_disk = -1;
7090 mddev->recovery = 0;
7091 /* flag recovery needed just to double check */
7092 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7093 sysfs_notify_dirent(mddev->sysfs_action);
7094 md_new_event(mddev);
7097 /* Set RUNNING before clearing NEEDED to avoid
7098 * any transients in the value of "sync_action".
7100 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7101 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7102 /* Clear some bits that don't mean anything, but
7105 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7106 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7108 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7110 /* no recovery is running.
7111 * remove any failed drives, then
7112 * add spares if possible.
7113 * Spare are also removed and re-added, to allow
7114 * the personality to fail the re-add.
7117 if (mddev->reshape_position != MaxSector) {
7118 if (mddev->pers->check_reshape == NULL ||
7119 mddev->pers->check_reshape(mddev) != 0)
7120 /* Cannot proceed */
7122 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7123 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7124 } else if ((spares = remove_and_add_spares(mddev))) {
7125 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7126 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7127 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7128 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7129 } else if (mddev->recovery_cp < MaxSector) {
7130 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7131 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7132 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7133 /* nothing to be done ... */
7136 if (mddev->pers->sync_request) {
7137 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7138 /* We are adding a device or devices to an array
7139 * which has the bitmap stored on all devices.
7140 * So make sure all bitmap pages get written
7142 bitmap_write_all(mddev->bitmap);
7144 mddev->sync_thread = md_register_thread(md_do_sync,
7147 if (!mddev->sync_thread) {
7148 printk(KERN_ERR "%s: could not start resync"
7151 /* leave the spares where they are, it shouldn't hurt */
7152 mddev->recovery = 0;
7154 md_wakeup_thread(mddev->sync_thread);
7155 sysfs_notify_dirent(mddev->sysfs_action);
7156 md_new_event(mddev);
7159 if (!mddev->sync_thread) {
7160 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7161 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7163 if (mddev->sysfs_action)
7164 sysfs_notify_dirent(mddev->sysfs_action);
7166 mddev_unlock(mddev);
7170 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7172 sysfs_notify_dirent(rdev->sysfs_state);
7173 wait_event_timeout(rdev->blocked_wait,
7174 !test_bit(Blocked, &rdev->flags),
7175 msecs_to_jiffies(5000));
7176 rdev_dec_pending(rdev, mddev);
7178 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7180 static int md_notify_reboot(struct notifier_block *this,
7181 unsigned long code, void *x)
7183 struct list_head *tmp;
7186 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7188 printk(KERN_INFO "md: stopping all md devices.\n");
7190 for_each_mddev(mddev, tmp)
7191 if (mddev_trylock(mddev)) {
7192 /* Force a switch to readonly even array
7193 * appears to still be in use. Hence
7196 md_set_readonly(mddev, 100);
7197 mddev_unlock(mddev);
7200 * certain more exotic SCSI devices are known to be
7201 * volatile wrt too early system reboots. While the
7202 * right place to handle this issue is the given
7203 * driver, we do want to have a safe RAID driver ...
7210 static struct notifier_block md_notifier = {
7211 .notifier_call = md_notify_reboot,
7213 .priority = INT_MAX, /* before any real devices */
7216 static void md_geninit(void)
7218 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7220 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7223 static int __init md_init(void)
7225 if (register_blkdev(MD_MAJOR, "md"))
7227 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7228 unregister_blkdev(MD_MAJOR, "md");
7231 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7232 md_probe, NULL, NULL);
7233 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7234 md_probe, NULL, NULL);
7236 register_reboot_notifier(&md_notifier);
7237 raid_table_header = register_sysctl_table(raid_root_table);
7247 * Searches all registered partitions for autorun RAID arrays
7251 static LIST_HEAD(all_detected_devices);
7252 struct detected_devices_node {
7253 struct list_head list;
7257 void md_autodetect_dev(dev_t dev)
7259 struct detected_devices_node *node_detected_dev;
7261 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7262 if (node_detected_dev) {
7263 node_detected_dev->dev = dev;
7264 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7266 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7267 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7272 static void autostart_arrays(int part)
7275 struct detected_devices_node *node_detected_dev;
7277 int i_scanned, i_passed;
7282 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7284 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7286 node_detected_dev = list_entry(all_detected_devices.next,
7287 struct detected_devices_node, list);
7288 list_del(&node_detected_dev->list);
7289 dev = node_detected_dev->dev;
7290 kfree(node_detected_dev);
7291 rdev = md_import_device(dev,0, 90);
7295 if (test_bit(Faulty, &rdev->flags)) {
7299 set_bit(AutoDetected, &rdev->flags);
7300 list_add(&rdev->same_set, &pending_raid_disks);
7304 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7305 i_scanned, i_passed);
7307 autorun_devices(part);
7310 #endif /* !MODULE */
7312 static __exit void md_exit(void)
7315 struct list_head *tmp;
7317 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7318 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7320 unregister_blkdev(MD_MAJOR,"md");
7321 unregister_blkdev(mdp_major, "mdp");
7322 unregister_reboot_notifier(&md_notifier);
7323 unregister_sysctl_table(raid_table_header);
7324 remove_proc_entry("mdstat", NULL);
7325 for_each_mddev(mddev, tmp) {
7326 export_array(mddev);
7327 mddev->hold_active = 0;
7331 subsys_initcall(md_init);
7332 module_exit(md_exit)
7334 static int get_ro(char *buffer, struct kernel_param *kp)
7336 return sprintf(buffer, "%d", start_readonly);
7338 static int set_ro(const char *val, struct kernel_param *kp)
7341 int num = simple_strtoul(val, &e, 10);
7342 if (*val && (*e == '\0' || *e == '\n')) {
7343 start_readonly = num;
7349 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7350 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7352 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7354 EXPORT_SYMBOL(register_md_personality);
7355 EXPORT_SYMBOL(unregister_md_personality);
7356 EXPORT_SYMBOL(md_error);
7357 EXPORT_SYMBOL(md_done_sync);
7358 EXPORT_SYMBOL(md_write_start);
7359 EXPORT_SYMBOL(md_write_end);
7360 EXPORT_SYMBOL(md_register_thread);
7361 EXPORT_SYMBOL(md_unregister_thread);
7362 EXPORT_SYMBOL(md_wakeup_thread);
7363 EXPORT_SYMBOL(md_check_recovery);
7364 MODULE_LICENSE("GPL");
7365 MODULE_DESCRIPTION("MD RAID framework");
7367 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);