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>
56 #define dprintk(x...) ((void)(DEBUG && printk(x)))
60 static void autostart_arrays(int part);
63 static LIST_HEAD(pers_list);
64 static DEFINE_SPINLOCK(pers_lock);
66 static void md_print_devices(void);
68 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
73 * Default number of read corrections we'll attempt on an rdev
74 * before ejecting it from the array. We divide the read error
75 * count by 2 for every hour elapsed between read errors.
77 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
79 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
80 * is 1000 KB/sec, so the extra system load does not show up that much.
81 * Increase it if you want to have more _guaranteed_ speed. Note that
82 * the RAID driver will use the maximum available bandwidth if the IO
83 * subsystem is idle. There is also an 'absolute maximum' reconstruction
84 * speed limit - in case reconstruction slows down your system despite
87 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88 * or /sys/block/mdX/md/sync_speed_{min,max}
91 static int sysctl_speed_limit_min = 1000;
92 static int sysctl_speed_limit_max = 200000;
93 static inline int speed_min(mddev_t *mddev)
95 return mddev->sync_speed_min ?
96 mddev->sync_speed_min : sysctl_speed_limit_min;
99 static inline int speed_max(mddev_t *mddev)
101 return mddev->sync_speed_max ?
102 mddev->sync_speed_max : sysctl_speed_limit_max;
105 static struct ctl_table_header *raid_table_header;
107 static ctl_table raid_table[] = {
109 .procname = "speed_limit_min",
110 .data = &sysctl_speed_limit_min,
111 .maxlen = sizeof(int),
112 .mode = S_IRUGO|S_IWUSR,
113 .proc_handler = proc_dointvec,
116 .procname = "speed_limit_max",
117 .data = &sysctl_speed_limit_max,
118 .maxlen = sizeof(int),
119 .mode = S_IRUGO|S_IWUSR,
120 .proc_handler = proc_dointvec,
125 static ctl_table raid_dir_table[] = {
129 .mode = S_IRUGO|S_IXUGO,
135 static ctl_table raid_root_table[] = {
140 .child = raid_dir_table,
145 static const struct block_device_operations md_fops;
147 static int start_readonly;
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
159 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
160 static atomic_t md_event_count;
161 void md_new_event(mddev_t *mddev)
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
166 EXPORT_SYMBOL_GPL(md_new_event);
168 /* Alternate version that can be called from interrupts
169 * when calling sysfs_notify isn't needed.
171 static void md_new_event_inintr(mddev_t *mddev)
173 atomic_inc(&md_event_count);
174 wake_up(&md_event_waiters);
178 * Enables to iterate over all existing md arrays
179 * all_mddevs_lock protects this list.
181 static LIST_HEAD(all_mddevs);
182 static DEFINE_SPINLOCK(all_mddevs_lock);
186 * iterates through all used mddevs in the system.
187 * We take care to grab the all_mddevs_lock whenever navigating
188 * the list, and to always hold a refcount when unlocked.
189 * Any code which breaks out of this loop while own
190 * a reference to the current mddev and must mddev_put it.
192 #define for_each_mddev(mddev,tmp) \
194 for (({ spin_lock(&all_mddevs_lock); \
195 tmp = all_mddevs.next; \
197 ({ if (tmp != &all_mddevs) \
198 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
199 spin_unlock(&all_mddevs_lock); \
200 if (mddev) mddev_put(mddev); \
201 mddev = list_entry(tmp, mddev_t, all_mddevs); \
202 tmp != &all_mddevs;}); \
203 ({ spin_lock(&all_mddevs_lock); \
208 /* Rather than calling directly into the personality make_request function,
209 * IO requests come here first so that we can check if the device is
210 * being suspended pending a reconfiguration.
211 * We hold a refcount over the call to ->make_request. By the time that
212 * call has finished, the bio has been linked into some internal structure
213 * and so is visible to ->quiesce(), so we don't need the refcount any more.
215 static int md_make_request(struct request_queue *q, struct bio *bio)
217 const int rw = bio_data_dir(bio);
218 mddev_t *mddev = q->queuedata;
222 if (mddev == NULL || mddev->pers == NULL) {
227 if (mddev->suspended || mddev->barrier) {
230 prepare_to_wait(&mddev->sb_wait, &__wait,
231 TASK_UNINTERRUPTIBLE);
232 if (!mddev->suspended && !mddev->barrier)
238 finish_wait(&mddev->sb_wait, &__wait);
240 atomic_inc(&mddev->active_io);
243 rv = mddev->pers->make_request(mddev, bio);
245 cpu = part_stat_lock();
246 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
247 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
251 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
252 wake_up(&mddev->sb_wait);
257 /* mddev_suspend makes sure no new requests are submitted
258 * to the device, and that any requests that have been submitted
259 * are completely handled.
260 * Once ->stop is called and completes, the module will be completely
263 static void mddev_suspend(mddev_t *mddev)
265 BUG_ON(mddev->suspended);
266 mddev->suspended = 1;
268 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
269 mddev->pers->quiesce(mddev, 1);
272 static void mddev_resume(mddev_t *mddev)
274 mddev->suspended = 0;
275 wake_up(&mddev->sb_wait);
276 mddev->pers->quiesce(mddev, 0);
279 int mddev_congested(mddev_t *mddev, int bits)
283 return mddev->suspended;
285 EXPORT_SYMBOL(mddev_congested);
288 * Generic barrier handling for md
291 #define POST_REQUEST_BARRIER ((void*)1)
293 static void md_end_barrier(struct bio *bio, int err)
295 mdk_rdev_t *rdev = bio->bi_private;
296 mddev_t *mddev = rdev->mddev;
297 if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
298 set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
300 rdev_dec_pending(rdev, mddev);
302 if (atomic_dec_and_test(&mddev->flush_pending)) {
303 if (mddev->barrier == POST_REQUEST_BARRIER) {
304 /* This was a post-request barrier */
305 mddev->barrier = NULL;
306 wake_up(&mddev->sb_wait);
308 /* The pre-request barrier has finished */
309 schedule_work(&mddev->barrier_work);
314 static void submit_barriers(mddev_t *mddev)
319 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
320 if (rdev->raid_disk >= 0 &&
321 !test_bit(Faulty, &rdev->flags)) {
322 /* Take two references, one is dropped
323 * when request finishes, one after
324 * we reclaim rcu_read_lock
327 atomic_inc(&rdev->nr_pending);
328 atomic_inc(&rdev->nr_pending);
330 bi = bio_alloc(GFP_KERNEL, 0);
331 bi->bi_end_io = md_end_barrier;
332 bi->bi_private = rdev;
333 bi->bi_bdev = rdev->bdev;
334 atomic_inc(&mddev->flush_pending);
335 submit_bio(WRITE_BARRIER, bi);
337 rdev_dec_pending(rdev, mddev);
342 static void md_submit_barrier(struct work_struct *ws)
344 mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
345 struct bio *bio = mddev->barrier;
347 atomic_set(&mddev->flush_pending, 1);
349 if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
350 bio_endio(bio, -EOPNOTSUPP);
351 else if (bio->bi_size == 0)
352 /* an empty barrier - all done */
355 bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
356 if (mddev->pers->make_request(mddev, bio))
357 generic_make_request(bio);
358 mddev->barrier = POST_REQUEST_BARRIER;
359 submit_barriers(mddev);
361 if (atomic_dec_and_test(&mddev->flush_pending)) {
362 mddev->barrier = NULL;
363 wake_up(&mddev->sb_wait);
367 void md_barrier_request(mddev_t *mddev, struct bio *bio)
369 spin_lock_irq(&mddev->write_lock);
370 wait_event_lock_irq(mddev->sb_wait,
372 mddev->write_lock, /*nothing*/);
373 mddev->barrier = bio;
374 spin_unlock_irq(&mddev->write_lock);
376 atomic_set(&mddev->flush_pending, 1);
377 INIT_WORK(&mddev->barrier_work, md_submit_barrier);
379 submit_barriers(mddev);
381 if (atomic_dec_and_test(&mddev->flush_pending))
382 schedule_work(&mddev->barrier_work);
384 EXPORT_SYMBOL(md_barrier_request);
386 static inline mddev_t *mddev_get(mddev_t *mddev)
388 atomic_inc(&mddev->active);
392 static void mddev_delayed_delete(struct work_struct *ws);
394 static void mddev_put(mddev_t *mddev)
396 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
398 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
399 mddev->ctime == 0 && !mddev->hold_active) {
400 /* Array is not configured at all, and not held active,
402 list_del(&mddev->all_mddevs);
403 if (mddev->gendisk) {
404 /* we did a probe so need to clean up.
405 * Call schedule_work inside the spinlock
406 * so that flush_scheduled_work() after
407 * mddev_find will succeed in waiting for the
410 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
411 schedule_work(&mddev->del_work);
415 spin_unlock(&all_mddevs_lock);
418 static void mddev_init(mddev_t *mddev)
420 mutex_init(&mddev->open_mutex);
421 mutex_init(&mddev->reconfig_mutex);
422 mutex_init(&mddev->bitmap_info.mutex);
423 INIT_LIST_HEAD(&mddev->disks);
424 INIT_LIST_HEAD(&mddev->all_mddevs);
425 init_timer(&mddev->safemode_timer);
426 atomic_set(&mddev->active, 1);
427 atomic_set(&mddev->openers, 0);
428 atomic_set(&mddev->active_io, 0);
429 spin_lock_init(&mddev->write_lock);
430 atomic_set(&mddev->flush_pending, 0);
431 init_waitqueue_head(&mddev->sb_wait);
432 init_waitqueue_head(&mddev->recovery_wait);
433 mddev->reshape_position = MaxSector;
434 mddev->resync_min = 0;
435 mddev->resync_max = MaxSector;
436 mddev->level = LEVEL_NONE;
439 static mddev_t * mddev_find(dev_t unit)
441 mddev_t *mddev, *new = NULL;
444 spin_lock(&all_mddevs_lock);
447 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
448 if (mddev->unit == unit) {
450 spin_unlock(&all_mddevs_lock);
456 list_add(&new->all_mddevs, &all_mddevs);
457 spin_unlock(&all_mddevs_lock);
458 new->hold_active = UNTIL_IOCTL;
462 /* find an unused unit number */
463 static int next_minor = 512;
464 int start = next_minor;
468 dev = MKDEV(MD_MAJOR, next_minor);
470 if (next_minor > MINORMASK)
472 if (next_minor == start) {
473 /* Oh dear, all in use. */
474 spin_unlock(&all_mddevs_lock);
480 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
481 if (mddev->unit == dev) {
487 new->md_minor = MINOR(dev);
488 new->hold_active = UNTIL_STOP;
489 list_add(&new->all_mddevs, &all_mddevs);
490 spin_unlock(&all_mddevs_lock);
493 spin_unlock(&all_mddevs_lock);
495 new = kzalloc(sizeof(*new), GFP_KERNEL);
500 if (MAJOR(unit) == MD_MAJOR)
501 new->md_minor = MINOR(unit);
503 new->md_minor = MINOR(unit) >> MdpMinorShift;
510 static inline int mddev_lock(mddev_t * mddev)
512 return mutex_lock_interruptible(&mddev->reconfig_mutex);
515 static inline int mddev_is_locked(mddev_t *mddev)
517 return mutex_is_locked(&mddev->reconfig_mutex);
520 static inline int mddev_trylock(mddev_t * mddev)
522 return mutex_trylock(&mddev->reconfig_mutex);
525 static struct attribute_group md_redundancy_group;
527 static void mddev_unlock(mddev_t * mddev)
529 if (mddev->to_remove) {
530 /* These cannot be removed under reconfig_mutex as
531 * an access to the files will try to take reconfig_mutex
532 * while holding the file unremovable, which leads to
534 * So hold open_mutex instead - we are allowed to take
535 * it while holding reconfig_mutex, and md_run can
536 * use it to wait for the remove to complete.
538 struct attribute_group *to_remove = mddev->to_remove;
539 mddev->to_remove = NULL;
540 mutex_lock(&mddev->open_mutex);
541 mutex_unlock(&mddev->reconfig_mutex);
543 if (to_remove != &md_redundancy_group)
544 sysfs_remove_group(&mddev->kobj, to_remove);
545 if (mddev->pers == NULL ||
546 mddev->pers->sync_request == NULL) {
547 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
548 if (mddev->sysfs_action)
549 sysfs_put(mddev->sysfs_action);
550 mddev->sysfs_action = NULL;
552 mutex_unlock(&mddev->open_mutex);
554 mutex_unlock(&mddev->reconfig_mutex);
556 md_wakeup_thread(mddev->thread);
559 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
563 list_for_each_entry(rdev, &mddev->disks, same_set)
564 if (rdev->desc_nr == nr)
570 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
574 list_for_each_entry(rdev, &mddev->disks, same_set)
575 if (rdev->bdev->bd_dev == dev)
581 static struct mdk_personality *find_pers(int level, char *clevel)
583 struct mdk_personality *pers;
584 list_for_each_entry(pers, &pers_list, list) {
585 if (level != LEVEL_NONE && pers->level == level)
587 if (strcmp(pers->name, clevel)==0)
593 /* return the offset of the super block in 512byte sectors */
594 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
596 sector_t num_sectors = bdev->bd_inode->i_size / 512;
597 return MD_NEW_SIZE_SECTORS(num_sectors);
600 static int alloc_disk_sb(mdk_rdev_t * rdev)
605 rdev->sb_page = alloc_page(GFP_KERNEL);
606 if (!rdev->sb_page) {
607 printk(KERN_ALERT "md: out of memory.\n");
614 static void free_disk_sb(mdk_rdev_t * rdev)
617 put_page(rdev->sb_page);
619 rdev->sb_page = NULL;
626 static void super_written(struct bio *bio, int error)
628 mdk_rdev_t *rdev = bio->bi_private;
629 mddev_t *mddev = rdev->mddev;
631 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
632 printk("md: super_written gets error=%d, uptodate=%d\n",
633 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
634 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
635 md_error(mddev, rdev);
638 if (atomic_dec_and_test(&mddev->pending_writes))
639 wake_up(&mddev->sb_wait);
643 static void super_written_barrier(struct bio *bio, int error)
645 struct bio *bio2 = bio->bi_private;
646 mdk_rdev_t *rdev = bio2->bi_private;
647 mddev_t *mddev = rdev->mddev;
649 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
650 error == -EOPNOTSUPP) {
652 /* barriers don't appear to be supported :-( */
653 set_bit(BarriersNotsupp, &rdev->flags);
654 mddev->barriers_work = 0;
655 spin_lock_irqsave(&mddev->write_lock, flags);
656 bio2->bi_next = mddev->biolist;
657 mddev->biolist = bio2;
658 spin_unlock_irqrestore(&mddev->write_lock, flags);
659 wake_up(&mddev->sb_wait);
663 bio->bi_private = rdev;
664 super_written(bio, error);
668 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
669 sector_t sector, int size, struct page *page)
671 /* write first size bytes of page to sector of rdev
672 * Increment mddev->pending_writes before returning
673 * and decrement it on completion, waking up sb_wait
674 * if zero is reached.
675 * If an error occurred, call md_error
677 * As we might need to resubmit the request if BIO_RW_BARRIER
678 * causes ENOTSUPP, we allocate a spare bio...
680 struct bio *bio = bio_alloc(GFP_NOIO, 1);
681 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
683 bio->bi_bdev = rdev->bdev;
684 bio->bi_sector = sector;
685 bio_add_page(bio, page, size, 0);
686 bio->bi_private = rdev;
687 bio->bi_end_io = super_written;
690 atomic_inc(&mddev->pending_writes);
691 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
693 rw |= (1<<BIO_RW_BARRIER);
694 rbio = bio_clone(bio, GFP_NOIO);
695 rbio->bi_private = bio;
696 rbio->bi_end_io = super_written_barrier;
697 submit_bio(rw, rbio);
702 void md_super_wait(mddev_t *mddev)
704 /* wait for all superblock writes that were scheduled to complete.
705 * if any had to be retried (due to BARRIER problems), retry them
709 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
710 if (atomic_read(&mddev->pending_writes)==0)
712 while (mddev->biolist) {
714 spin_lock_irq(&mddev->write_lock);
715 bio = mddev->biolist;
716 mddev->biolist = bio->bi_next ;
718 spin_unlock_irq(&mddev->write_lock);
719 submit_bio(bio->bi_rw, bio);
723 finish_wait(&mddev->sb_wait, &wq);
726 static void bi_complete(struct bio *bio, int error)
728 complete((struct completion*)bio->bi_private);
731 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
732 struct page *page, int rw)
734 struct bio *bio = bio_alloc(GFP_NOIO, 1);
735 struct completion event;
738 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
741 bio->bi_sector = sector;
742 bio_add_page(bio, page, size, 0);
743 init_completion(&event);
744 bio->bi_private = &event;
745 bio->bi_end_io = bi_complete;
747 wait_for_completion(&event);
749 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
753 EXPORT_SYMBOL_GPL(sync_page_io);
755 static int read_disk_sb(mdk_rdev_t * rdev, int size)
757 char b[BDEVNAME_SIZE];
758 if (!rdev->sb_page) {
766 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
772 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
773 bdevname(rdev->bdev,b));
777 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
779 return sb1->set_uuid0 == sb2->set_uuid0 &&
780 sb1->set_uuid1 == sb2->set_uuid1 &&
781 sb1->set_uuid2 == sb2->set_uuid2 &&
782 sb1->set_uuid3 == sb2->set_uuid3;
785 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
788 mdp_super_t *tmp1, *tmp2;
790 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
791 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
793 if (!tmp1 || !tmp2) {
795 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
803 * nr_disks is not constant
808 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
816 static u32 md_csum_fold(u32 csum)
818 csum = (csum & 0xffff) + (csum >> 16);
819 return (csum & 0xffff) + (csum >> 16);
822 static unsigned int calc_sb_csum(mdp_super_t * sb)
825 u32 *sb32 = (u32*)sb;
827 unsigned int disk_csum, csum;
829 disk_csum = sb->sb_csum;
832 for (i = 0; i < MD_SB_BYTES/4 ; i++)
834 csum = (newcsum & 0xffffffff) + (newcsum>>32);
838 /* This used to use csum_partial, which was wrong for several
839 * reasons including that different results are returned on
840 * different architectures. It isn't critical that we get exactly
841 * the same return value as before (we always csum_fold before
842 * testing, and that removes any differences). However as we
843 * know that csum_partial always returned a 16bit value on
844 * alphas, do a fold to maximise conformity to previous behaviour.
846 sb->sb_csum = md_csum_fold(disk_csum);
848 sb->sb_csum = disk_csum;
855 * Handle superblock details.
856 * We want to be able to handle multiple superblock formats
857 * so we have a common interface to them all, and an array of
858 * different handlers.
859 * We rely on user-space to write the initial superblock, and support
860 * reading and updating of superblocks.
861 * Interface methods are:
862 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
863 * loads and validates a superblock on dev.
864 * if refdev != NULL, compare superblocks on both devices
866 * 0 - dev has a superblock that is compatible with refdev
867 * 1 - dev has a superblock that is compatible and newer than refdev
868 * so dev should be used as the refdev in future
869 * -EINVAL superblock incompatible or invalid
870 * -othererror e.g. -EIO
872 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
873 * Verify that dev is acceptable into mddev.
874 * The first time, mddev->raid_disks will be 0, and data from
875 * dev should be merged in. Subsequent calls check that dev
876 * is new enough. Return 0 or -EINVAL
878 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
879 * Update the superblock for rdev with data in mddev
880 * This does not write to disc.
886 struct module *owner;
887 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
889 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
890 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
891 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
892 sector_t num_sectors);
896 * Check that the given mddev has no bitmap.
898 * This function is called from the run method of all personalities that do not
899 * support bitmaps. It prints an error message and returns non-zero if mddev
900 * has a bitmap. Otherwise, it returns 0.
903 int md_check_no_bitmap(mddev_t *mddev)
905 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
907 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
908 mdname(mddev), mddev->pers->name);
911 EXPORT_SYMBOL(md_check_no_bitmap);
914 * load_super for 0.90.0
916 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
918 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
923 * Calculate the position of the superblock (512byte sectors),
924 * it's at the end of the disk.
926 * It also happens to be a multiple of 4Kb.
928 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
930 ret = read_disk_sb(rdev, MD_SB_BYTES);
935 bdevname(rdev->bdev, b);
936 sb = (mdp_super_t*)page_address(rdev->sb_page);
938 if (sb->md_magic != MD_SB_MAGIC) {
939 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
944 if (sb->major_version != 0 ||
945 sb->minor_version < 90 ||
946 sb->minor_version > 91) {
947 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
948 sb->major_version, sb->minor_version,
953 if (sb->raid_disks <= 0)
956 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
957 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
962 rdev->preferred_minor = sb->md_minor;
963 rdev->data_offset = 0;
964 rdev->sb_size = MD_SB_BYTES;
966 if (sb->level == LEVEL_MULTIPATH)
969 rdev->desc_nr = sb->this_disk.number;
975 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
976 if (!uuid_equal(refsb, sb)) {
977 printk(KERN_WARNING "md: %s has different UUID to %s\n",
978 b, bdevname(refdev->bdev,b2));
981 if (!sb_equal(refsb, sb)) {
982 printk(KERN_WARNING "md: %s has same UUID"
983 " but different superblock to %s\n",
984 b, bdevname(refdev->bdev, b2));
988 ev2 = md_event(refsb);
994 rdev->sectors = rdev->sb_start;
996 if (rdev->sectors < sb->size * 2 && sb->level > 1)
997 /* "this cannot possibly happen" ... */
1005 * validate_super for 0.90.0
1007 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1010 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1011 __u64 ev1 = md_event(sb);
1013 rdev->raid_disk = -1;
1014 clear_bit(Faulty, &rdev->flags);
1015 clear_bit(In_sync, &rdev->flags);
1016 clear_bit(WriteMostly, &rdev->flags);
1017 clear_bit(BarriersNotsupp, &rdev->flags);
1019 if (mddev->raid_disks == 0) {
1020 mddev->major_version = 0;
1021 mddev->minor_version = sb->minor_version;
1022 mddev->patch_version = sb->patch_version;
1023 mddev->external = 0;
1024 mddev->chunk_sectors = sb->chunk_size >> 9;
1025 mddev->ctime = sb->ctime;
1026 mddev->utime = sb->utime;
1027 mddev->level = sb->level;
1028 mddev->clevel[0] = 0;
1029 mddev->layout = sb->layout;
1030 mddev->raid_disks = sb->raid_disks;
1031 mddev->dev_sectors = sb->size * 2;
1032 mddev->events = ev1;
1033 mddev->bitmap_info.offset = 0;
1034 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1036 if (mddev->minor_version >= 91) {
1037 mddev->reshape_position = sb->reshape_position;
1038 mddev->delta_disks = sb->delta_disks;
1039 mddev->new_level = sb->new_level;
1040 mddev->new_layout = sb->new_layout;
1041 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1043 mddev->reshape_position = MaxSector;
1044 mddev->delta_disks = 0;
1045 mddev->new_level = mddev->level;
1046 mddev->new_layout = mddev->layout;
1047 mddev->new_chunk_sectors = mddev->chunk_sectors;
1050 if (sb->state & (1<<MD_SB_CLEAN))
1051 mddev->recovery_cp = MaxSector;
1053 if (sb->events_hi == sb->cp_events_hi &&
1054 sb->events_lo == sb->cp_events_lo) {
1055 mddev->recovery_cp = sb->recovery_cp;
1057 mddev->recovery_cp = 0;
1060 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1061 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1062 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1063 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1065 mddev->max_disks = MD_SB_DISKS;
1067 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1068 mddev->bitmap_info.file == NULL)
1069 mddev->bitmap_info.offset =
1070 mddev->bitmap_info.default_offset;
1072 } else if (mddev->pers == NULL) {
1073 /* Insist on good event counter while assembling, except
1074 * for spares (which don't need an event count) */
1076 if (sb->disks[rdev->desc_nr].state & (
1077 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1078 if (ev1 < mddev->events)
1080 } else if (mddev->bitmap) {
1081 /* if adding to array with a bitmap, then we can accept an
1082 * older device ... but not too old.
1084 if (ev1 < mddev->bitmap->events_cleared)
1087 if (ev1 < mddev->events)
1088 /* just a hot-add of a new device, leave raid_disk at -1 */
1092 if (mddev->level != LEVEL_MULTIPATH) {
1093 desc = sb->disks + rdev->desc_nr;
1095 if (desc->state & (1<<MD_DISK_FAULTY))
1096 set_bit(Faulty, &rdev->flags);
1097 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1098 desc->raid_disk < mddev->raid_disks */) {
1099 set_bit(In_sync, &rdev->flags);
1100 rdev->raid_disk = desc->raid_disk;
1101 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1102 /* active but not in sync implies recovery up to
1103 * reshape position. We don't know exactly where
1104 * that is, so set to zero for now */
1105 if (mddev->minor_version >= 91) {
1106 rdev->recovery_offset = 0;
1107 rdev->raid_disk = desc->raid_disk;
1110 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1111 set_bit(WriteMostly, &rdev->flags);
1112 } else /* MULTIPATH are always insync */
1113 set_bit(In_sync, &rdev->flags);
1118 * sync_super for 0.90.0
1120 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1124 int next_spare = mddev->raid_disks;
1127 /* make rdev->sb match mddev data..
1130 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1131 * 3/ any empty disks < next_spare become removed
1133 * disks[0] gets initialised to REMOVED because
1134 * we cannot be sure from other fields if it has
1135 * been initialised or not.
1138 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1140 rdev->sb_size = MD_SB_BYTES;
1142 sb = (mdp_super_t*)page_address(rdev->sb_page);
1144 memset(sb, 0, sizeof(*sb));
1146 sb->md_magic = MD_SB_MAGIC;
1147 sb->major_version = mddev->major_version;
1148 sb->patch_version = mddev->patch_version;
1149 sb->gvalid_words = 0; /* ignored */
1150 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1151 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1152 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1153 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1155 sb->ctime = mddev->ctime;
1156 sb->level = mddev->level;
1157 sb->size = mddev->dev_sectors / 2;
1158 sb->raid_disks = mddev->raid_disks;
1159 sb->md_minor = mddev->md_minor;
1160 sb->not_persistent = 0;
1161 sb->utime = mddev->utime;
1163 sb->events_hi = (mddev->events>>32);
1164 sb->events_lo = (u32)mddev->events;
1166 if (mddev->reshape_position == MaxSector)
1167 sb->minor_version = 90;
1169 sb->minor_version = 91;
1170 sb->reshape_position = mddev->reshape_position;
1171 sb->new_level = mddev->new_level;
1172 sb->delta_disks = mddev->delta_disks;
1173 sb->new_layout = mddev->new_layout;
1174 sb->new_chunk = mddev->new_chunk_sectors << 9;
1176 mddev->minor_version = sb->minor_version;
1179 sb->recovery_cp = mddev->recovery_cp;
1180 sb->cp_events_hi = (mddev->events>>32);
1181 sb->cp_events_lo = (u32)mddev->events;
1182 if (mddev->recovery_cp == MaxSector)
1183 sb->state = (1<< MD_SB_CLEAN);
1185 sb->recovery_cp = 0;
1187 sb->layout = mddev->layout;
1188 sb->chunk_size = mddev->chunk_sectors << 9;
1190 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1191 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1193 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1194 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1197 int is_active = test_bit(In_sync, &rdev2->flags);
1199 if (rdev2->raid_disk >= 0 &&
1200 sb->minor_version >= 91)
1201 /* we have nowhere to store the recovery_offset,
1202 * but if it is not below the reshape_position,
1203 * we can piggy-back on that.
1206 if (rdev2->raid_disk < 0 ||
1207 test_bit(Faulty, &rdev2->flags))
1210 desc_nr = rdev2->raid_disk;
1212 desc_nr = next_spare++;
1213 rdev2->desc_nr = desc_nr;
1214 d = &sb->disks[rdev2->desc_nr];
1216 d->number = rdev2->desc_nr;
1217 d->major = MAJOR(rdev2->bdev->bd_dev);
1218 d->minor = MINOR(rdev2->bdev->bd_dev);
1220 d->raid_disk = rdev2->raid_disk;
1222 d->raid_disk = rdev2->desc_nr; /* compatibility */
1223 if (test_bit(Faulty, &rdev2->flags))
1224 d->state = (1<<MD_DISK_FAULTY);
1225 else if (is_active) {
1226 d->state = (1<<MD_DISK_ACTIVE);
1227 if (test_bit(In_sync, &rdev2->flags))
1228 d->state |= (1<<MD_DISK_SYNC);
1236 if (test_bit(WriteMostly, &rdev2->flags))
1237 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1239 /* now set the "removed" and "faulty" bits on any missing devices */
1240 for (i=0 ; i < mddev->raid_disks ; i++) {
1241 mdp_disk_t *d = &sb->disks[i];
1242 if (d->state == 0 && d->number == 0) {
1245 d->state = (1<<MD_DISK_REMOVED);
1246 d->state |= (1<<MD_DISK_FAULTY);
1250 sb->nr_disks = nr_disks;
1251 sb->active_disks = active;
1252 sb->working_disks = working;
1253 sb->failed_disks = failed;
1254 sb->spare_disks = spare;
1256 sb->this_disk = sb->disks[rdev->desc_nr];
1257 sb->sb_csum = calc_sb_csum(sb);
1261 * rdev_size_change for 0.90.0
1263 static unsigned long long
1264 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1266 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1267 return 0; /* component must fit device */
1268 if (rdev->mddev->bitmap_info.offset)
1269 return 0; /* can't move bitmap */
1270 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1271 if (!num_sectors || num_sectors > rdev->sb_start)
1272 num_sectors = rdev->sb_start;
1273 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1275 md_super_wait(rdev->mddev);
1276 return num_sectors / 2; /* kB for sysfs */
1281 * version 1 superblock
1284 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1288 unsigned long long newcsum;
1289 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1290 __le32 *isuper = (__le32*)sb;
1293 disk_csum = sb->sb_csum;
1296 for (i=0; size>=4; size -= 4 )
1297 newcsum += le32_to_cpu(*isuper++);
1300 newcsum += le16_to_cpu(*(__le16*) isuper);
1302 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1303 sb->sb_csum = disk_csum;
1304 return cpu_to_le32(csum);
1307 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1309 struct mdp_superblock_1 *sb;
1312 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1316 * Calculate the position of the superblock in 512byte sectors.
1317 * It is always aligned to a 4K boundary and
1318 * depeding on minor_version, it can be:
1319 * 0: At least 8K, but less than 12K, from end of device
1320 * 1: At start of device
1321 * 2: 4K from start of device.
1323 switch(minor_version) {
1325 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1327 sb_start &= ~(sector_t)(4*2-1);
1338 rdev->sb_start = sb_start;
1340 /* superblock is rarely larger than 1K, but it can be larger,
1341 * and it is safe to read 4k, so we do that
1343 ret = read_disk_sb(rdev, 4096);
1344 if (ret) return ret;
1347 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1349 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1350 sb->major_version != cpu_to_le32(1) ||
1351 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1352 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1353 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1356 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1357 printk("md: invalid superblock checksum on %s\n",
1358 bdevname(rdev->bdev,b));
1361 if (le64_to_cpu(sb->data_size) < 10) {
1362 printk("md: data_size too small on %s\n",
1363 bdevname(rdev->bdev,b));
1367 rdev->preferred_minor = 0xffff;
1368 rdev->data_offset = le64_to_cpu(sb->data_offset);
1369 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1371 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1372 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1373 if (rdev->sb_size & bmask)
1374 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1377 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1380 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1383 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1389 struct mdp_superblock_1 *refsb =
1390 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1392 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1393 sb->level != refsb->level ||
1394 sb->layout != refsb->layout ||
1395 sb->chunksize != refsb->chunksize) {
1396 printk(KERN_WARNING "md: %s has strangely different"
1397 " superblock to %s\n",
1398 bdevname(rdev->bdev,b),
1399 bdevname(refdev->bdev,b2));
1402 ev1 = le64_to_cpu(sb->events);
1403 ev2 = le64_to_cpu(refsb->events);
1411 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1412 le64_to_cpu(sb->data_offset);
1414 rdev->sectors = rdev->sb_start;
1415 if (rdev->sectors < le64_to_cpu(sb->data_size))
1417 rdev->sectors = le64_to_cpu(sb->data_size);
1418 if (le64_to_cpu(sb->size) > rdev->sectors)
1423 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1425 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1426 __u64 ev1 = le64_to_cpu(sb->events);
1428 rdev->raid_disk = -1;
1429 clear_bit(Faulty, &rdev->flags);
1430 clear_bit(In_sync, &rdev->flags);
1431 clear_bit(WriteMostly, &rdev->flags);
1432 clear_bit(BarriersNotsupp, &rdev->flags);
1434 if (mddev->raid_disks == 0) {
1435 mddev->major_version = 1;
1436 mddev->patch_version = 0;
1437 mddev->external = 0;
1438 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1439 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1440 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1441 mddev->level = le32_to_cpu(sb->level);
1442 mddev->clevel[0] = 0;
1443 mddev->layout = le32_to_cpu(sb->layout);
1444 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1445 mddev->dev_sectors = le64_to_cpu(sb->size);
1446 mddev->events = ev1;
1447 mddev->bitmap_info.offset = 0;
1448 mddev->bitmap_info.default_offset = 1024 >> 9;
1450 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1451 memcpy(mddev->uuid, sb->set_uuid, 16);
1453 mddev->max_disks = (4096-256)/2;
1455 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1456 mddev->bitmap_info.file == NULL )
1457 mddev->bitmap_info.offset =
1458 (__s32)le32_to_cpu(sb->bitmap_offset);
1460 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1461 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1462 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1463 mddev->new_level = le32_to_cpu(sb->new_level);
1464 mddev->new_layout = le32_to_cpu(sb->new_layout);
1465 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1467 mddev->reshape_position = MaxSector;
1468 mddev->delta_disks = 0;
1469 mddev->new_level = mddev->level;
1470 mddev->new_layout = mddev->layout;
1471 mddev->new_chunk_sectors = mddev->chunk_sectors;
1474 } else if (mddev->pers == NULL) {
1475 /* Insist of good event counter while assembling, except for
1476 * spares (which don't need an event count) */
1478 if (rdev->desc_nr >= 0 &&
1479 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1480 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1481 if (ev1 < mddev->events)
1483 } else if (mddev->bitmap) {
1484 /* If adding to array with a bitmap, then we can accept an
1485 * older device, but not too old.
1487 if (ev1 < mddev->bitmap->events_cleared)
1490 if (ev1 < mddev->events)
1491 /* just a hot-add of a new device, leave raid_disk at -1 */
1494 if (mddev->level != LEVEL_MULTIPATH) {
1496 if (rdev->desc_nr < 0 ||
1497 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1501 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1503 case 0xffff: /* spare */
1505 case 0xfffe: /* faulty */
1506 set_bit(Faulty, &rdev->flags);
1509 if ((le32_to_cpu(sb->feature_map) &
1510 MD_FEATURE_RECOVERY_OFFSET))
1511 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1513 set_bit(In_sync, &rdev->flags);
1514 rdev->raid_disk = role;
1517 if (sb->devflags & WriteMostly1)
1518 set_bit(WriteMostly, &rdev->flags);
1519 } else /* MULTIPATH are always insync */
1520 set_bit(In_sync, &rdev->flags);
1525 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1527 struct mdp_superblock_1 *sb;
1530 /* make rdev->sb match mddev and rdev data. */
1532 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1534 sb->feature_map = 0;
1536 sb->recovery_offset = cpu_to_le64(0);
1537 memset(sb->pad1, 0, sizeof(sb->pad1));
1538 memset(sb->pad2, 0, sizeof(sb->pad2));
1539 memset(sb->pad3, 0, sizeof(sb->pad3));
1541 sb->utime = cpu_to_le64((__u64)mddev->utime);
1542 sb->events = cpu_to_le64(mddev->events);
1544 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1546 sb->resync_offset = cpu_to_le64(0);
1548 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1550 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1551 sb->size = cpu_to_le64(mddev->dev_sectors);
1552 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1553 sb->level = cpu_to_le32(mddev->level);
1554 sb->layout = cpu_to_le32(mddev->layout);
1556 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1557 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1558 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1561 if (rdev->raid_disk >= 0 &&
1562 !test_bit(In_sync, &rdev->flags)) {
1564 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1565 sb->recovery_offset =
1566 cpu_to_le64(rdev->recovery_offset);
1569 if (mddev->reshape_position != MaxSector) {
1570 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1571 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1572 sb->new_layout = cpu_to_le32(mddev->new_layout);
1573 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1574 sb->new_level = cpu_to_le32(mddev->new_level);
1575 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1579 list_for_each_entry(rdev2, &mddev->disks, same_set)
1580 if (rdev2->desc_nr+1 > max_dev)
1581 max_dev = rdev2->desc_nr+1;
1583 if (max_dev > le32_to_cpu(sb->max_dev)) {
1585 sb->max_dev = cpu_to_le32(max_dev);
1586 rdev->sb_size = max_dev * 2 + 256;
1587 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1588 if (rdev->sb_size & bmask)
1589 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1591 for (i=0; i<max_dev;i++)
1592 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1594 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1596 if (test_bit(Faulty, &rdev2->flags))
1597 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1598 else if (test_bit(In_sync, &rdev2->flags))
1599 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1600 else if (rdev2->raid_disk >= 0)
1601 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1603 sb->dev_roles[i] = cpu_to_le16(0xffff);
1606 sb->sb_csum = calc_sb_1_csum(sb);
1609 static unsigned long long
1610 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1612 struct mdp_superblock_1 *sb;
1613 sector_t max_sectors;
1614 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1615 return 0; /* component must fit device */
1616 if (rdev->sb_start < rdev->data_offset) {
1617 /* minor versions 1 and 2; superblock before data */
1618 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1619 max_sectors -= rdev->data_offset;
1620 if (!num_sectors || num_sectors > max_sectors)
1621 num_sectors = max_sectors;
1622 } else if (rdev->mddev->bitmap_info.offset) {
1623 /* minor version 0 with bitmap we can't move */
1626 /* minor version 0; superblock after data */
1628 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1629 sb_start &= ~(sector_t)(4*2 - 1);
1630 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1631 if (!num_sectors || num_sectors > max_sectors)
1632 num_sectors = max_sectors;
1633 rdev->sb_start = sb_start;
1635 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1636 sb->data_size = cpu_to_le64(num_sectors);
1637 sb->super_offset = rdev->sb_start;
1638 sb->sb_csum = calc_sb_1_csum(sb);
1639 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1641 md_super_wait(rdev->mddev);
1642 return num_sectors / 2; /* kB for sysfs */
1645 static struct super_type super_types[] = {
1648 .owner = THIS_MODULE,
1649 .load_super = super_90_load,
1650 .validate_super = super_90_validate,
1651 .sync_super = super_90_sync,
1652 .rdev_size_change = super_90_rdev_size_change,
1656 .owner = THIS_MODULE,
1657 .load_super = super_1_load,
1658 .validate_super = super_1_validate,
1659 .sync_super = super_1_sync,
1660 .rdev_size_change = super_1_rdev_size_change,
1664 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1666 mdk_rdev_t *rdev, *rdev2;
1669 rdev_for_each_rcu(rdev, mddev1)
1670 rdev_for_each_rcu(rdev2, mddev2)
1671 if (rdev->bdev->bd_contains ==
1672 rdev2->bdev->bd_contains) {
1680 static LIST_HEAD(pending_raid_disks);
1683 * Try to register data integrity profile for an mddev
1685 * This is called when an array is started and after a disk has been kicked
1686 * from the array. It only succeeds if all working and active component devices
1687 * are integrity capable with matching profiles.
1689 int md_integrity_register(mddev_t *mddev)
1691 mdk_rdev_t *rdev, *reference = NULL;
1693 if (list_empty(&mddev->disks))
1694 return 0; /* nothing to do */
1695 if (blk_get_integrity(mddev->gendisk))
1696 return 0; /* already registered */
1697 list_for_each_entry(rdev, &mddev->disks, same_set) {
1698 /* skip spares and non-functional disks */
1699 if (test_bit(Faulty, &rdev->flags))
1701 if (rdev->raid_disk < 0)
1704 * If at least one rdev is not integrity capable, we can not
1705 * enable data integrity for the md device.
1707 if (!bdev_get_integrity(rdev->bdev))
1710 /* Use the first rdev as the reference */
1714 /* does this rdev's profile match the reference profile? */
1715 if (blk_integrity_compare(reference->bdev->bd_disk,
1716 rdev->bdev->bd_disk) < 0)
1720 * All component devices are integrity capable and have matching
1721 * profiles, register the common profile for the md device.
1723 if (blk_integrity_register(mddev->gendisk,
1724 bdev_get_integrity(reference->bdev)) != 0) {
1725 printk(KERN_ERR "md: failed to register integrity for %s\n",
1729 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1733 EXPORT_SYMBOL(md_integrity_register);
1735 /* Disable data integrity if non-capable/non-matching disk is being added */
1736 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1738 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1739 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1741 if (!bi_mddev) /* nothing to do */
1743 if (rdev->raid_disk < 0) /* skip spares */
1745 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1746 rdev->bdev->bd_disk) >= 0)
1748 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1749 blk_integrity_unregister(mddev->gendisk);
1751 EXPORT_SYMBOL(md_integrity_add_rdev);
1753 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1755 char b[BDEVNAME_SIZE];
1765 /* prevent duplicates */
1766 if (find_rdev(mddev, rdev->bdev->bd_dev))
1769 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1770 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1771 rdev->sectors < mddev->dev_sectors)) {
1773 /* Cannot change size, so fail
1774 * If mddev->level <= 0, then we don't care
1775 * about aligning sizes (e.g. linear)
1777 if (mddev->level > 0)
1780 mddev->dev_sectors = rdev->sectors;
1783 /* Verify rdev->desc_nr is unique.
1784 * If it is -1, assign a free number, else
1785 * check number is not in use
1787 if (rdev->desc_nr < 0) {
1789 if (mddev->pers) choice = mddev->raid_disks;
1790 while (find_rdev_nr(mddev, choice))
1792 rdev->desc_nr = choice;
1794 if (find_rdev_nr(mddev, rdev->desc_nr))
1797 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1798 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1799 mdname(mddev), mddev->max_disks);
1802 bdevname(rdev->bdev,b);
1803 while ( (s=strchr(b, '/')) != NULL)
1806 rdev->mddev = mddev;
1807 printk(KERN_INFO "md: bind<%s>\n", b);
1809 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1812 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1813 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1814 kobject_del(&rdev->kobj);
1817 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1819 list_add_rcu(&rdev->same_set, &mddev->disks);
1820 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1822 /* May as well allow recovery to be retried once */
1823 mddev->recovery_disabled = 0;
1828 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1833 static void md_delayed_delete(struct work_struct *ws)
1835 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1836 kobject_del(&rdev->kobj);
1837 kobject_put(&rdev->kobj);
1840 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1842 char b[BDEVNAME_SIZE];
1847 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1848 list_del_rcu(&rdev->same_set);
1849 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1851 sysfs_remove_link(&rdev->kobj, "block");
1852 sysfs_put(rdev->sysfs_state);
1853 rdev->sysfs_state = NULL;
1854 /* We need to delay this, otherwise we can deadlock when
1855 * writing to 'remove' to "dev/state". We also need
1856 * to delay it due to rcu usage.
1859 INIT_WORK(&rdev->del_work, md_delayed_delete);
1860 kobject_get(&rdev->kobj);
1861 schedule_work(&rdev->del_work);
1865 * prevent the device from being mounted, repartitioned or
1866 * otherwise reused by a RAID array (or any other kernel
1867 * subsystem), by bd_claiming the device.
1869 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1872 struct block_device *bdev;
1873 char b[BDEVNAME_SIZE];
1875 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1877 printk(KERN_ERR "md: could not open %s.\n",
1878 __bdevname(dev, b));
1879 return PTR_ERR(bdev);
1881 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1883 printk(KERN_ERR "md: could not bd_claim %s.\n",
1885 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1889 set_bit(AllReserved, &rdev->flags);
1894 static void unlock_rdev(mdk_rdev_t *rdev)
1896 struct block_device *bdev = rdev->bdev;
1901 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1904 void md_autodetect_dev(dev_t dev);
1906 static void export_rdev(mdk_rdev_t * rdev)
1908 char b[BDEVNAME_SIZE];
1909 printk(KERN_INFO "md: export_rdev(%s)\n",
1910 bdevname(rdev->bdev,b));
1915 if (test_bit(AutoDetected, &rdev->flags))
1916 md_autodetect_dev(rdev->bdev->bd_dev);
1919 kobject_put(&rdev->kobj);
1922 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1924 unbind_rdev_from_array(rdev);
1928 static void export_array(mddev_t *mddev)
1930 mdk_rdev_t *rdev, *tmp;
1932 rdev_for_each(rdev, tmp, mddev) {
1937 kick_rdev_from_array(rdev);
1939 if (!list_empty(&mddev->disks))
1941 mddev->raid_disks = 0;
1942 mddev->major_version = 0;
1945 static void print_desc(mdp_disk_t *desc)
1947 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1948 desc->major,desc->minor,desc->raid_disk,desc->state);
1951 static void print_sb_90(mdp_super_t *sb)
1956 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1957 sb->major_version, sb->minor_version, sb->patch_version,
1958 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1960 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1961 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1962 sb->md_minor, sb->layout, sb->chunk_size);
1963 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1964 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1965 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1966 sb->failed_disks, sb->spare_disks,
1967 sb->sb_csum, (unsigned long)sb->events_lo);
1970 for (i = 0; i < MD_SB_DISKS; i++) {
1973 desc = sb->disks + i;
1974 if (desc->number || desc->major || desc->minor ||
1975 desc->raid_disk || (desc->state && (desc->state != 4))) {
1976 printk(" D %2d: ", i);
1980 printk(KERN_INFO "md: THIS: ");
1981 print_desc(&sb->this_disk);
1984 static void print_sb_1(struct mdp_superblock_1 *sb)
1988 uuid = sb->set_uuid;
1990 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1991 "md: Name: \"%s\" CT:%llu\n",
1992 le32_to_cpu(sb->major_version),
1993 le32_to_cpu(sb->feature_map),
1996 (unsigned long long)le64_to_cpu(sb->ctime)
1997 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1999 uuid = sb->device_uuid;
2001 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2003 "md: Dev:%08x UUID: %pU\n"
2004 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2005 "md: (MaxDev:%u) \n",
2006 le32_to_cpu(sb->level),
2007 (unsigned long long)le64_to_cpu(sb->size),
2008 le32_to_cpu(sb->raid_disks),
2009 le32_to_cpu(sb->layout),
2010 le32_to_cpu(sb->chunksize),
2011 (unsigned long long)le64_to_cpu(sb->data_offset),
2012 (unsigned long long)le64_to_cpu(sb->data_size),
2013 (unsigned long long)le64_to_cpu(sb->super_offset),
2014 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2015 le32_to_cpu(sb->dev_number),
2018 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2019 (unsigned long long)le64_to_cpu(sb->events),
2020 (unsigned long long)le64_to_cpu(sb->resync_offset),
2021 le32_to_cpu(sb->sb_csum),
2022 le32_to_cpu(sb->max_dev)
2026 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2028 char b[BDEVNAME_SIZE];
2029 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2030 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2031 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2033 if (rdev->sb_loaded) {
2034 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2035 switch (major_version) {
2037 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2040 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2044 printk(KERN_INFO "md: no rdev superblock!\n");
2047 static void md_print_devices(void)
2049 struct list_head *tmp;
2052 char b[BDEVNAME_SIZE];
2055 printk("md: **********************************\n");
2056 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2057 printk("md: **********************************\n");
2058 for_each_mddev(mddev, tmp) {
2061 bitmap_print_sb(mddev->bitmap);
2063 printk("%s: ", mdname(mddev));
2064 list_for_each_entry(rdev, &mddev->disks, same_set)
2065 printk("<%s>", bdevname(rdev->bdev,b));
2068 list_for_each_entry(rdev, &mddev->disks, same_set)
2069 print_rdev(rdev, mddev->major_version);
2071 printk("md: **********************************\n");
2076 static void sync_sbs(mddev_t * mddev, int nospares)
2078 /* Update each superblock (in-memory image), but
2079 * if we are allowed to, skip spares which already
2080 * have the right event counter, or have one earlier
2081 * (which would mean they aren't being marked as dirty
2082 * with the rest of the array)
2086 /* First make sure individual recovery_offsets are correct */
2087 list_for_each_entry(rdev, &mddev->disks, same_set) {
2088 if (rdev->raid_disk >= 0 &&
2089 !test_bit(In_sync, &rdev->flags) &&
2090 mddev->curr_resync_completed > rdev->recovery_offset)
2091 rdev->recovery_offset = mddev->curr_resync_completed;
2094 list_for_each_entry(rdev, &mddev->disks, same_set) {
2095 if (rdev->sb_events == mddev->events ||
2097 rdev->raid_disk < 0 &&
2098 rdev->sb_events+1 == mddev->events)) {
2099 /* Don't update this superblock */
2100 rdev->sb_loaded = 2;
2102 super_types[mddev->major_version].
2103 sync_super(mddev, rdev);
2104 rdev->sb_loaded = 1;
2109 static void md_update_sb(mddev_t * mddev, int force_change)
2115 mddev->utime = get_seconds();
2116 if (mddev->external)
2119 spin_lock_irq(&mddev->write_lock);
2121 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2122 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2124 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2125 /* just a clean<-> dirty transition, possibly leave spares alone,
2126 * though if events isn't the right even/odd, we will have to do
2132 if (mddev->degraded)
2133 /* If the array is degraded, then skipping spares is both
2134 * dangerous and fairly pointless.
2135 * Dangerous because a device that was removed from the array
2136 * might have a event_count that still looks up-to-date,
2137 * so it can be re-added without a resync.
2138 * Pointless because if there are any spares to skip,
2139 * then a recovery will happen and soon that array won't
2140 * be degraded any more and the spare can go back to sleep then.
2144 sync_req = mddev->in_sync;
2146 /* If this is just a dirty<->clean transition, and the array is clean
2147 * and 'events' is odd, we can roll back to the previous clean state */
2149 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2150 && mddev->can_decrease_events
2151 && mddev->events != 1) {
2153 mddev->can_decrease_events = 0;
2155 /* otherwise we have to go forward and ... */
2157 mddev->can_decrease_events = nospares;
2160 if (!mddev->events) {
2162 * oops, this 64-bit counter should never wrap.
2163 * Either we are in around ~1 trillion A.C., assuming
2164 * 1 reboot per second, or we have a bug:
2171 * do not write anything to disk if using
2172 * nonpersistent superblocks
2174 if (!mddev->persistent) {
2175 if (!mddev->external)
2176 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2178 spin_unlock_irq(&mddev->write_lock);
2179 wake_up(&mddev->sb_wait);
2182 sync_sbs(mddev, nospares);
2183 spin_unlock_irq(&mddev->write_lock);
2186 "md: updating %s RAID superblock on device (in sync %d)\n",
2187 mdname(mddev),mddev->in_sync);
2189 bitmap_update_sb(mddev->bitmap);
2190 list_for_each_entry(rdev, &mddev->disks, same_set) {
2191 char b[BDEVNAME_SIZE];
2192 dprintk(KERN_INFO "md: ");
2193 if (rdev->sb_loaded != 1)
2194 continue; /* no noise on spare devices */
2195 if (test_bit(Faulty, &rdev->flags))
2196 dprintk("(skipping faulty ");
2198 dprintk("%s ", bdevname(rdev->bdev,b));
2199 if (!test_bit(Faulty, &rdev->flags)) {
2200 md_super_write(mddev,rdev,
2201 rdev->sb_start, rdev->sb_size,
2203 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2204 bdevname(rdev->bdev,b),
2205 (unsigned long long)rdev->sb_start);
2206 rdev->sb_events = mddev->events;
2210 if (mddev->level == LEVEL_MULTIPATH)
2211 /* only need to write one superblock... */
2214 md_super_wait(mddev);
2215 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2217 spin_lock_irq(&mddev->write_lock);
2218 if (mddev->in_sync != sync_req ||
2219 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2220 /* have to write it out again */
2221 spin_unlock_irq(&mddev->write_lock);
2224 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2225 spin_unlock_irq(&mddev->write_lock);
2226 wake_up(&mddev->sb_wait);
2227 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2228 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2232 /* words written to sysfs files may, or may not, be \n terminated.
2233 * We want to accept with case. For this we use cmd_match.
2235 static int cmd_match(const char *cmd, const char *str)
2237 /* See if cmd, written into a sysfs file, matches
2238 * str. They must either be the same, or cmd can
2239 * have a trailing newline
2241 while (*cmd && *str && *cmd == *str) {
2252 struct rdev_sysfs_entry {
2253 struct attribute attr;
2254 ssize_t (*show)(mdk_rdev_t *, char *);
2255 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2259 state_show(mdk_rdev_t *rdev, char *page)
2264 if (test_bit(Faulty, &rdev->flags)) {
2265 len+= sprintf(page+len, "%sfaulty",sep);
2268 if (test_bit(In_sync, &rdev->flags)) {
2269 len += sprintf(page+len, "%sin_sync",sep);
2272 if (test_bit(WriteMostly, &rdev->flags)) {
2273 len += sprintf(page+len, "%swrite_mostly",sep);
2276 if (test_bit(Blocked, &rdev->flags)) {
2277 len += sprintf(page+len, "%sblocked", sep);
2280 if (!test_bit(Faulty, &rdev->flags) &&
2281 !test_bit(In_sync, &rdev->flags)) {
2282 len += sprintf(page+len, "%sspare", sep);
2285 return len+sprintf(page+len, "\n");
2289 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2292 * faulty - simulates and error
2293 * remove - disconnects the device
2294 * writemostly - sets write_mostly
2295 * -writemostly - clears write_mostly
2296 * blocked - sets the Blocked flag
2297 * -blocked - clears the Blocked flag
2298 * insync - sets Insync providing device isn't active
2301 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2302 md_error(rdev->mddev, rdev);
2304 } else if (cmd_match(buf, "remove")) {
2305 if (rdev->raid_disk >= 0)
2308 mddev_t *mddev = rdev->mddev;
2309 kick_rdev_from_array(rdev);
2311 md_update_sb(mddev, 1);
2312 md_new_event(mddev);
2315 } else if (cmd_match(buf, "writemostly")) {
2316 set_bit(WriteMostly, &rdev->flags);
2318 } else if (cmd_match(buf, "-writemostly")) {
2319 clear_bit(WriteMostly, &rdev->flags);
2321 } else if (cmd_match(buf, "blocked")) {
2322 set_bit(Blocked, &rdev->flags);
2324 } else if (cmd_match(buf, "-blocked")) {
2325 clear_bit(Blocked, &rdev->flags);
2326 wake_up(&rdev->blocked_wait);
2327 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2328 md_wakeup_thread(rdev->mddev->thread);
2331 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2332 set_bit(In_sync, &rdev->flags);
2335 if (!err && rdev->sysfs_state)
2336 sysfs_notify_dirent(rdev->sysfs_state);
2337 return err ? err : len;
2339 static struct rdev_sysfs_entry rdev_state =
2340 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2343 errors_show(mdk_rdev_t *rdev, char *page)
2345 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2349 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2352 unsigned long n = simple_strtoul(buf, &e, 10);
2353 if (*buf && (*e == 0 || *e == '\n')) {
2354 atomic_set(&rdev->corrected_errors, n);
2359 static struct rdev_sysfs_entry rdev_errors =
2360 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2363 slot_show(mdk_rdev_t *rdev, char *page)
2365 if (rdev->raid_disk < 0)
2366 return sprintf(page, "none\n");
2368 return sprintf(page, "%d\n", rdev->raid_disk);
2372 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2377 int slot = simple_strtoul(buf, &e, 10);
2378 if (strncmp(buf, "none", 4)==0)
2380 else if (e==buf || (*e && *e!= '\n'))
2382 if (rdev->mddev->pers && slot == -1) {
2383 /* Setting 'slot' on an active array requires also
2384 * updating the 'rd%d' link, and communicating
2385 * with the personality with ->hot_*_disk.
2386 * For now we only support removing
2387 * failed/spare devices. This normally happens automatically,
2388 * but not when the metadata is externally managed.
2390 if (rdev->raid_disk == -1)
2392 /* personality does all needed checks */
2393 if (rdev->mddev->pers->hot_add_disk == NULL)
2395 err = rdev->mddev->pers->
2396 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2399 sprintf(nm, "rd%d", rdev->raid_disk);
2400 sysfs_remove_link(&rdev->mddev->kobj, nm);
2401 rdev->raid_disk = -1;
2402 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2403 md_wakeup_thread(rdev->mddev->thread);
2404 } else if (rdev->mddev->pers) {
2406 /* Activating a spare .. or possibly reactivating
2407 * if we ever get bitmaps working here.
2410 if (rdev->raid_disk != -1)
2413 if (rdev->mddev->pers->hot_add_disk == NULL)
2416 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2417 if (rdev2->raid_disk == slot)
2420 rdev->raid_disk = slot;
2421 if (test_bit(In_sync, &rdev->flags))
2422 rdev->saved_raid_disk = slot;
2424 rdev->saved_raid_disk = -1;
2425 err = rdev->mddev->pers->
2426 hot_add_disk(rdev->mddev, rdev);
2428 rdev->raid_disk = -1;
2431 sysfs_notify_dirent(rdev->sysfs_state);
2432 sprintf(nm, "rd%d", rdev->raid_disk);
2433 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2435 "md: cannot register "
2437 nm, mdname(rdev->mddev));
2439 /* don't wakeup anyone, leave that to userspace. */
2441 if (slot >= rdev->mddev->raid_disks)
2443 rdev->raid_disk = slot;
2444 /* assume it is working */
2445 clear_bit(Faulty, &rdev->flags);
2446 clear_bit(WriteMostly, &rdev->flags);
2447 set_bit(In_sync, &rdev->flags);
2448 sysfs_notify_dirent(rdev->sysfs_state);
2454 static struct rdev_sysfs_entry rdev_slot =
2455 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2458 offset_show(mdk_rdev_t *rdev, char *page)
2460 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2464 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2467 unsigned long long offset = simple_strtoull(buf, &e, 10);
2468 if (e==buf || (*e && *e != '\n'))
2470 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2472 if (rdev->sectors && rdev->mddev->external)
2473 /* Must set offset before size, so overlap checks
2476 rdev->data_offset = offset;
2480 static struct rdev_sysfs_entry rdev_offset =
2481 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2484 rdev_size_show(mdk_rdev_t *rdev, char *page)
2486 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2489 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2491 /* check if two start/length pairs overlap */
2499 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2501 unsigned long long blocks;
2504 if (strict_strtoull(buf, 10, &blocks) < 0)
2507 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2508 return -EINVAL; /* sector conversion overflow */
2511 if (new != blocks * 2)
2512 return -EINVAL; /* unsigned long long to sector_t overflow */
2519 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2521 mddev_t *my_mddev = rdev->mddev;
2522 sector_t oldsectors = rdev->sectors;
2525 if (strict_blocks_to_sectors(buf, §ors) < 0)
2527 if (my_mddev->pers && rdev->raid_disk >= 0) {
2528 if (my_mddev->persistent) {
2529 sectors = super_types[my_mddev->major_version].
2530 rdev_size_change(rdev, sectors);
2533 } else if (!sectors)
2534 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2537 if (sectors < my_mddev->dev_sectors)
2538 return -EINVAL; /* component must fit device */
2540 rdev->sectors = sectors;
2541 if (sectors > oldsectors && my_mddev->external) {
2542 /* need to check that all other rdevs with the same ->bdev
2543 * do not overlap. We need to unlock the mddev to avoid
2544 * a deadlock. We have already changed rdev->sectors, and if
2545 * we have to change it back, we will have the lock again.
2549 struct list_head *tmp;
2551 mddev_unlock(my_mddev);
2552 for_each_mddev(mddev, tmp) {
2556 list_for_each_entry(rdev2, &mddev->disks, same_set)
2557 if (test_bit(AllReserved, &rdev2->flags) ||
2558 (rdev->bdev == rdev2->bdev &&
2560 overlaps(rdev->data_offset, rdev->sectors,
2566 mddev_unlock(mddev);
2572 mddev_lock(my_mddev);
2574 /* Someone else could have slipped in a size
2575 * change here, but doing so is just silly.
2576 * We put oldsectors back because we *know* it is
2577 * safe, and trust userspace not to race with
2580 rdev->sectors = oldsectors;
2587 static struct rdev_sysfs_entry rdev_size =
2588 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2591 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2593 unsigned long long recovery_start = rdev->recovery_offset;
2595 if (test_bit(In_sync, &rdev->flags) ||
2596 recovery_start == MaxSector)
2597 return sprintf(page, "none\n");
2599 return sprintf(page, "%llu\n", recovery_start);
2602 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2604 unsigned long long recovery_start;
2606 if (cmd_match(buf, "none"))
2607 recovery_start = MaxSector;
2608 else if (strict_strtoull(buf, 10, &recovery_start))
2611 if (rdev->mddev->pers &&
2612 rdev->raid_disk >= 0)
2615 rdev->recovery_offset = recovery_start;
2616 if (recovery_start == MaxSector)
2617 set_bit(In_sync, &rdev->flags);
2619 clear_bit(In_sync, &rdev->flags);
2623 static struct rdev_sysfs_entry rdev_recovery_start =
2624 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2626 static struct attribute *rdev_default_attrs[] = {
2632 &rdev_recovery_start.attr,
2636 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2638 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2639 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2640 mddev_t *mddev = rdev->mddev;
2646 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2648 if (rdev->mddev == NULL)
2651 rv = entry->show(rdev, page);
2652 mddev_unlock(mddev);
2658 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2659 const char *page, size_t length)
2661 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2662 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2664 mddev_t *mddev = rdev->mddev;
2668 if (!capable(CAP_SYS_ADMIN))
2670 rv = mddev ? mddev_lock(mddev): -EBUSY;
2672 if (rdev->mddev == NULL)
2675 rv = entry->store(rdev, page, length);
2676 mddev_unlock(mddev);
2681 static void rdev_free(struct kobject *ko)
2683 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2686 static struct sysfs_ops rdev_sysfs_ops = {
2687 .show = rdev_attr_show,
2688 .store = rdev_attr_store,
2690 static struct kobj_type rdev_ktype = {
2691 .release = rdev_free,
2692 .sysfs_ops = &rdev_sysfs_ops,
2693 .default_attrs = rdev_default_attrs,
2697 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2699 * mark the device faulty if:
2701 * - the device is nonexistent (zero size)
2702 * - the device has no valid superblock
2704 * a faulty rdev _never_ has rdev->sb set.
2706 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2708 char b[BDEVNAME_SIZE];
2713 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2715 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2716 return ERR_PTR(-ENOMEM);
2719 if ((err = alloc_disk_sb(rdev)))
2722 err = lock_rdev(rdev, newdev, super_format == -2);
2726 kobject_init(&rdev->kobj, &rdev_ktype);
2729 rdev->saved_raid_disk = -1;
2730 rdev->raid_disk = -1;
2732 rdev->data_offset = 0;
2733 rdev->sb_events = 0;
2734 rdev->last_read_error.tv_sec = 0;
2735 rdev->last_read_error.tv_nsec = 0;
2736 atomic_set(&rdev->nr_pending, 0);
2737 atomic_set(&rdev->read_errors, 0);
2738 atomic_set(&rdev->corrected_errors, 0);
2740 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2743 "md: %s has zero or unknown size, marking faulty!\n",
2744 bdevname(rdev->bdev,b));
2749 if (super_format >= 0) {
2750 err = super_types[super_format].
2751 load_super(rdev, NULL, super_minor);
2752 if (err == -EINVAL) {
2754 "md: %s does not have a valid v%d.%d "
2755 "superblock, not importing!\n",
2756 bdevname(rdev->bdev,b),
2757 super_format, super_minor);
2762 "md: could not read %s's sb, not importing!\n",
2763 bdevname(rdev->bdev,b));
2768 INIT_LIST_HEAD(&rdev->same_set);
2769 init_waitqueue_head(&rdev->blocked_wait);
2774 if (rdev->sb_page) {
2780 return ERR_PTR(err);
2784 * Check a full RAID array for plausibility
2788 static void analyze_sbs(mddev_t * mddev)
2791 mdk_rdev_t *rdev, *freshest, *tmp;
2792 char b[BDEVNAME_SIZE];
2795 rdev_for_each(rdev, tmp, mddev)
2796 switch (super_types[mddev->major_version].
2797 load_super(rdev, freshest, mddev->minor_version)) {
2805 "md: fatal superblock inconsistency in %s"
2806 " -- removing from array\n",
2807 bdevname(rdev->bdev,b));
2808 kick_rdev_from_array(rdev);
2812 super_types[mddev->major_version].
2813 validate_super(mddev, freshest);
2816 rdev_for_each(rdev, tmp, mddev) {
2817 if (mddev->max_disks &&
2818 (rdev->desc_nr >= mddev->max_disks ||
2819 i > mddev->max_disks)) {
2821 "md: %s: %s: only %d devices permitted\n",
2822 mdname(mddev), bdevname(rdev->bdev, b),
2824 kick_rdev_from_array(rdev);
2827 if (rdev != freshest)
2828 if (super_types[mddev->major_version].
2829 validate_super(mddev, rdev)) {
2830 printk(KERN_WARNING "md: kicking non-fresh %s"
2832 bdevname(rdev->bdev,b));
2833 kick_rdev_from_array(rdev);
2836 if (mddev->level == LEVEL_MULTIPATH) {
2837 rdev->desc_nr = i++;
2838 rdev->raid_disk = rdev->desc_nr;
2839 set_bit(In_sync, &rdev->flags);
2840 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2841 rdev->raid_disk = -1;
2842 clear_bit(In_sync, &rdev->flags);
2847 /* Read a fixed-point number.
2848 * Numbers in sysfs attributes should be in "standard" units where
2849 * possible, so time should be in seconds.
2850 * However we internally use a a much smaller unit such as
2851 * milliseconds or jiffies.
2852 * This function takes a decimal number with a possible fractional
2853 * component, and produces an integer which is the result of
2854 * multiplying that number by 10^'scale'.
2855 * all without any floating-point arithmetic.
2857 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2859 unsigned long result = 0;
2861 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2864 else if (decimals < scale) {
2867 result = result * 10 + value;
2879 while (decimals < scale) {
2888 static void md_safemode_timeout(unsigned long data);
2891 safe_delay_show(mddev_t *mddev, char *page)
2893 int msec = (mddev->safemode_delay*1000)/HZ;
2894 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2897 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2901 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2904 mddev->safemode_delay = 0;
2906 unsigned long old_delay = mddev->safemode_delay;
2907 mddev->safemode_delay = (msec*HZ)/1000;
2908 if (mddev->safemode_delay == 0)
2909 mddev->safemode_delay = 1;
2910 if (mddev->safemode_delay < old_delay)
2911 md_safemode_timeout((unsigned long)mddev);
2915 static struct md_sysfs_entry md_safe_delay =
2916 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2919 level_show(mddev_t *mddev, char *page)
2921 struct mdk_personality *p = mddev->pers;
2923 return sprintf(page, "%s\n", p->name);
2924 else if (mddev->clevel[0])
2925 return sprintf(page, "%s\n", mddev->clevel);
2926 else if (mddev->level != LEVEL_NONE)
2927 return sprintf(page, "%d\n", mddev->level);
2933 level_store(mddev_t *mddev, const char *buf, size_t len)
2937 struct mdk_personality *pers;
2942 if (mddev->pers == NULL) {
2945 if (len >= sizeof(mddev->clevel))
2947 strncpy(mddev->clevel, buf, len);
2948 if (mddev->clevel[len-1] == '\n')
2950 mddev->clevel[len] = 0;
2951 mddev->level = LEVEL_NONE;
2955 /* request to change the personality. Need to ensure:
2956 * - array is not engaged in resync/recovery/reshape
2957 * - old personality can be suspended
2958 * - new personality will access other array.
2961 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2964 if (!mddev->pers->quiesce) {
2965 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2966 mdname(mddev), mddev->pers->name);
2970 /* Now find the new personality */
2971 if (len == 0 || len >= sizeof(clevel))
2973 strncpy(clevel, buf, len);
2974 if (clevel[len-1] == '\n')
2977 if (strict_strtol(clevel, 10, &level))
2980 if (request_module("md-%s", clevel) != 0)
2981 request_module("md-level-%s", clevel);
2982 spin_lock(&pers_lock);
2983 pers = find_pers(level, clevel);
2984 if (!pers || !try_module_get(pers->owner)) {
2985 spin_unlock(&pers_lock);
2986 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
2989 spin_unlock(&pers_lock);
2991 if (pers == mddev->pers) {
2992 /* Nothing to do! */
2993 module_put(pers->owner);
2996 if (!pers->takeover) {
2997 module_put(pers->owner);
2998 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2999 mdname(mddev), clevel);
3003 /* ->takeover must set new_* and/or delta_disks
3004 * if it succeeds, and may set them when it fails.
3006 priv = pers->takeover(mddev);
3008 mddev->new_level = mddev->level;
3009 mddev->new_layout = mddev->layout;
3010 mddev->new_chunk_sectors = mddev->chunk_sectors;
3011 mddev->raid_disks -= mddev->delta_disks;
3012 mddev->delta_disks = 0;
3013 module_put(pers->owner);
3014 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3015 mdname(mddev), clevel);
3016 return PTR_ERR(priv);
3019 /* Looks like we have a winner */
3020 mddev_suspend(mddev);
3021 mddev->pers->stop(mddev);
3023 if (mddev->pers->sync_request == NULL &&
3024 pers->sync_request != NULL) {
3025 /* need to add the md_redundancy_group */
3026 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3028 "md: cannot register extra attributes for %s\n",
3030 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3032 if (mddev->pers->sync_request != NULL &&
3033 pers->sync_request == NULL) {
3034 /* need to remove the md_redundancy_group */
3035 if (mddev->to_remove == NULL)
3036 mddev->to_remove = &md_redundancy_group;
3039 if (mddev->pers->sync_request == NULL &&
3041 /* We are converting from a no-redundancy array
3042 * to a redundancy array and metadata is managed
3043 * externally so we need to be sure that writes
3044 * won't block due to a need to transition
3046 * until external management is started.
3049 mddev->safemode_delay = 0;
3050 mddev->safemode = 0;
3053 module_put(mddev->pers->owner);
3054 /* Invalidate devices that are now superfluous */
3055 list_for_each_entry(rdev, &mddev->disks, same_set)
3056 if (rdev->raid_disk >= mddev->raid_disks) {
3057 rdev->raid_disk = -1;
3058 clear_bit(In_sync, &rdev->flags);
3061 mddev->private = priv;
3062 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3063 mddev->level = mddev->new_level;
3064 mddev->layout = mddev->new_layout;
3065 mddev->chunk_sectors = mddev->new_chunk_sectors;
3066 mddev->delta_disks = 0;
3067 if (mddev->pers->sync_request == NULL) {
3068 /* this is now an array without redundancy, so
3069 * it must always be in_sync
3072 del_timer_sync(&mddev->safemode_timer);
3075 mddev_resume(mddev);
3076 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3077 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3078 md_wakeup_thread(mddev->thread);
3079 sysfs_notify(&mddev->kobj, NULL, "level");
3080 md_new_event(mddev);
3084 static struct md_sysfs_entry md_level =
3085 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3089 layout_show(mddev_t *mddev, char *page)
3091 /* just a number, not meaningful for all levels */
3092 if (mddev->reshape_position != MaxSector &&
3093 mddev->layout != mddev->new_layout)
3094 return sprintf(page, "%d (%d)\n",
3095 mddev->new_layout, mddev->layout);
3096 return sprintf(page, "%d\n", mddev->layout);
3100 layout_store(mddev_t *mddev, const char *buf, size_t len)
3103 unsigned long n = simple_strtoul(buf, &e, 10);
3105 if (!*buf || (*e && *e != '\n'))
3110 if (mddev->pers->check_reshape == NULL)
3112 mddev->new_layout = n;
3113 err = mddev->pers->check_reshape(mddev);
3115 mddev->new_layout = mddev->layout;
3119 mddev->new_layout = n;
3120 if (mddev->reshape_position == MaxSector)
3125 static struct md_sysfs_entry md_layout =
3126 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3130 raid_disks_show(mddev_t *mddev, char *page)
3132 if (mddev->raid_disks == 0)
3134 if (mddev->reshape_position != MaxSector &&
3135 mddev->delta_disks != 0)
3136 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3137 mddev->raid_disks - mddev->delta_disks);
3138 return sprintf(page, "%d\n", mddev->raid_disks);
3141 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3144 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3148 unsigned long n = simple_strtoul(buf, &e, 10);
3150 if (!*buf || (*e && *e != '\n'))
3154 rv = update_raid_disks(mddev, n);
3155 else if (mddev->reshape_position != MaxSector) {
3156 int olddisks = mddev->raid_disks - mddev->delta_disks;
3157 mddev->delta_disks = n - olddisks;
3158 mddev->raid_disks = n;
3160 mddev->raid_disks = n;
3161 return rv ? rv : len;
3163 static struct md_sysfs_entry md_raid_disks =
3164 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3167 chunk_size_show(mddev_t *mddev, char *page)
3169 if (mddev->reshape_position != MaxSector &&
3170 mddev->chunk_sectors != mddev->new_chunk_sectors)
3171 return sprintf(page, "%d (%d)\n",
3172 mddev->new_chunk_sectors << 9,
3173 mddev->chunk_sectors << 9);
3174 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3178 chunk_size_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'))
3188 if (mddev->pers->check_reshape == NULL)
3190 mddev->new_chunk_sectors = n >> 9;
3191 err = mddev->pers->check_reshape(mddev);
3193 mddev->new_chunk_sectors = mddev->chunk_sectors;
3197 mddev->new_chunk_sectors = n >> 9;
3198 if (mddev->reshape_position == MaxSector)
3199 mddev->chunk_sectors = n >> 9;
3203 static struct md_sysfs_entry md_chunk_size =
3204 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3207 resync_start_show(mddev_t *mddev, char *page)
3209 if (mddev->recovery_cp == MaxSector)
3210 return sprintf(page, "none\n");
3211 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3215 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3218 unsigned long long n = simple_strtoull(buf, &e, 10);
3222 if (cmd_match(buf, "none"))
3224 else if (!*buf || (*e && *e != '\n'))
3227 mddev->recovery_cp = n;
3230 static struct md_sysfs_entry md_resync_start =
3231 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3234 * The array state can be:
3237 * No devices, no size, no level
3238 * Equivalent to STOP_ARRAY ioctl
3240 * May have some settings, but array is not active
3241 * all IO results in error
3242 * When written, doesn't tear down array, but just stops it
3243 * suspended (not supported yet)
3244 * All IO requests will block. The array can be reconfigured.
3245 * Writing this, if accepted, will block until array is quiescent
3247 * no resync can happen. no superblocks get written.
3248 * write requests fail
3250 * like readonly, but behaves like 'clean' on a write request.
3252 * clean - no pending writes, but otherwise active.
3253 * When written to inactive array, starts without resync
3254 * If a write request arrives then
3255 * if metadata is known, mark 'dirty' and switch to 'active'.
3256 * if not known, block and switch to write-pending
3257 * If written to an active array that has pending writes, then fails.
3259 * fully active: IO and resync can be happening.
3260 * When written to inactive array, starts with resync
3263 * clean, but writes are blocked waiting for 'active' to be written.
3266 * like active, but no writes have been seen for a while (100msec).
3269 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3270 write_pending, active_idle, bad_word};
3271 static char *array_states[] = {
3272 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3273 "write-pending", "active-idle", NULL };
3275 static int match_word(const char *word, char **list)
3278 for (n=0; list[n]; n++)
3279 if (cmd_match(word, list[n]))
3285 array_state_show(mddev_t *mddev, char *page)
3287 enum array_state st = inactive;
3300 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3302 else if (mddev->safemode)
3308 if (list_empty(&mddev->disks) &&
3309 mddev->raid_disks == 0 &&
3310 mddev->dev_sectors == 0)
3315 return sprintf(page, "%s\n", array_states[st]);
3318 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3319 static int md_set_readonly(mddev_t * mddev, int is_open);
3320 static int do_md_run(mddev_t * mddev);
3321 static int restart_array(mddev_t *mddev);
3324 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3327 enum array_state st = match_word(buf, array_states);
3332 /* stopping an active array */
3333 if (atomic_read(&mddev->openers) > 0)
3335 err = do_md_stop(mddev, 0, 0);
3338 /* stopping an active array */
3340 if (atomic_read(&mddev->openers) > 0)
3342 err = do_md_stop(mddev, 2, 0);
3344 err = 0; /* already inactive */
3347 break; /* not supported yet */
3350 err = md_set_readonly(mddev, 0);
3353 set_disk_ro(mddev->gendisk, 1);
3354 err = do_md_run(mddev);
3360 err = md_set_readonly(mddev, 0);
3361 else if (mddev->ro == 1)
3362 err = restart_array(mddev);
3365 set_disk_ro(mddev->gendisk, 0);
3369 err = do_md_run(mddev);
3374 restart_array(mddev);
3375 spin_lock_irq(&mddev->write_lock);
3376 if (atomic_read(&mddev->writes_pending) == 0) {
3377 if (mddev->in_sync == 0) {
3379 if (mddev->safemode == 1)
3380 mddev->safemode = 0;
3381 if (mddev->persistent)
3382 set_bit(MD_CHANGE_CLEAN,
3388 spin_unlock_irq(&mddev->write_lock);
3394 restart_array(mddev);
3395 if (mddev->external)
3396 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3397 wake_up(&mddev->sb_wait);
3401 set_disk_ro(mddev->gendisk, 0);
3402 err = do_md_run(mddev);
3407 /* these cannot be set */
3413 sysfs_notify_dirent(mddev->sysfs_state);
3417 static struct md_sysfs_entry md_array_state =
3418 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3421 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3422 return sprintf(page, "%d\n",
3423 atomic_read(&mddev->max_corr_read_errors));
3427 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3430 unsigned long n = simple_strtoul(buf, &e, 10);
3432 if (*buf && (*e == 0 || *e == '\n')) {
3433 atomic_set(&mddev->max_corr_read_errors, n);
3439 static struct md_sysfs_entry max_corr_read_errors =
3440 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3441 max_corrected_read_errors_store);
3444 null_show(mddev_t *mddev, char *page)
3450 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3452 /* buf must be %d:%d\n? giving major and minor numbers */
3453 /* The new device is added to the array.
3454 * If the array has a persistent superblock, we read the
3455 * superblock to initialise info and check validity.
3456 * Otherwise, only checking done is that in bind_rdev_to_array,
3457 * which mainly checks size.
3460 int major = simple_strtoul(buf, &e, 10);
3466 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3468 minor = simple_strtoul(e+1, &e, 10);
3469 if (*e && *e != '\n')
3471 dev = MKDEV(major, minor);
3472 if (major != MAJOR(dev) ||
3473 minor != MINOR(dev))
3477 if (mddev->persistent) {
3478 rdev = md_import_device(dev, mddev->major_version,
3479 mddev->minor_version);
3480 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3481 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3482 mdk_rdev_t, same_set);
3483 err = super_types[mddev->major_version]
3484 .load_super(rdev, rdev0, mddev->minor_version);
3488 } else if (mddev->external)
3489 rdev = md_import_device(dev, -2, -1);
3491 rdev = md_import_device(dev, -1, -1);
3494 return PTR_ERR(rdev);
3495 err = bind_rdev_to_array(rdev, mddev);
3499 return err ? err : len;
3502 static struct md_sysfs_entry md_new_device =
3503 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3506 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3509 unsigned long chunk, end_chunk;
3513 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3515 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3516 if (buf == end) break;
3517 if (*end == '-') { /* range */
3519 end_chunk = simple_strtoul(buf, &end, 0);
3520 if (buf == end) break;
3522 if (*end && !isspace(*end)) break;
3523 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3524 buf = skip_spaces(end);
3526 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3531 static struct md_sysfs_entry md_bitmap =
3532 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3535 size_show(mddev_t *mddev, char *page)
3537 return sprintf(page, "%llu\n",
3538 (unsigned long long)mddev->dev_sectors / 2);
3541 static int update_size(mddev_t *mddev, sector_t num_sectors);
3544 size_store(mddev_t *mddev, const char *buf, size_t len)
3546 /* If array is inactive, we can reduce the component size, but
3547 * not increase it (except from 0).
3548 * If array is active, we can try an on-line resize
3551 int err = strict_blocks_to_sectors(buf, §ors);
3556 err = update_size(mddev, sectors);
3557 md_update_sb(mddev, 1);
3559 if (mddev->dev_sectors == 0 ||
3560 mddev->dev_sectors > sectors)
3561 mddev->dev_sectors = sectors;
3565 return err ? err : len;
3568 static struct md_sysfs_entry md_size =
3569 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3574 * 'none' for arrays with no metadata (good luck...)
3575 * 'external' for arrays with externally managed metadata,
3576 * or N.M for internally known formats
3579 metadata_show(mddev_t *mddev, char *page)
3581 if (mddev->persistent)
3582 return sprintf(page, "%d.%d\n",
3583 mddev->major_version, mddev->minor_version);
3584 else if (mddev->external)
3585 return sprintf(page, "external:%s\n", mddev->metadata_type);
3587 return sprintf(page, "none\n");
3591 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3595 /* Changing the details of 'external' metadata is
3596 * always permitted. Otherwise there must be
3597 * no devices attached to the array.
3599 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3601 else if (!list_empty(&mddev->disks))
3604 if (cmd_match(buf, "none")) {
3605 mddev->persistent = 0;
3606 mddev->external = 0;
3607 mddev->major_version = 0;
3608 mddev->minor_version = 90;
3611 if (strncmp(buf, "external:", 9) == 0) {
3612 size_t namelen = len-9;
3613 if (namelen >= sizeof(mddev->metadata_type))
3614 namelen = sizeof(mddev->metadata_type)-1;
3615 strncpy(mddev->metadata_type, buf+9, namelen);
3616 mddev->metadata_type[namelen] = 0;
3617 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3618 mddev->metadata_type[--namelen] = 0;
3619 mddev->persistent = 0;
3620 mddev->external = 1;
3621 mddev->major_version = 0;
3622 mddev->minor_version = 90;
3625 major = simple_strtoul(buf, &e, 10);
3626 if (e==buf || *e != '.')
3629 minor = simple_strtoul(buf, &e, 10);
3630 if (e==buf || (*e && *e != '\n') )
3632 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3634 mddev->major_version = major;
3635 mddev->minor_version = minor;
3636 mddev->persistent = 1;
3637 mddev->external = 0;
3641 static struct md_sysfs_entry md_metadata =
3642 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3645 action_show(mddev_t *mddev, char *page)
3647 char *type = "idle";
3648 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3650 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3651 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3652 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3654 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3655 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3657 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3661 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3664 return sprintf(page, "%s\n", type);
3668 action_store(mddev_t *mddev, const char *page, size_t len)
3670 if (!mddev->pers || !mddev->pers->sync_request)
3673 if (cmd_match(page, "frozen"))
3674 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3676 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3678 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3679 if (mddev->sync_thread) {
3680 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3681 md_unregister_thread(mddev->sync_thread);
3682 mddev->sync_thread = NULL;
3683 mddev->recovery = 0;
3685 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3686 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3688 else if (cmd_match(page, "resync"))
3689 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3690 else if (cmd_match(page, "recover")) {
3691 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3692 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3693 } else if (cmd_match(page, "reshape")) {
3695 if (mddev->pers->start_reshape == NULL)
3697 err = mddev->pers->start_reshape(mddev);
3700 sysfs_notify(&mddev->kobj, NULL, "degraded");
3702 if (cmd_match(page, "check"))
3703 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3704 else if (!cmd_match(page, "repair"))
3706 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3707 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3709 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3710 md_wakeup_thread(mddev->thread);
3711 sysfs_notify_dirent(mddev->sysfs_action);
3716 mismatch_cnt_show(mddev_t *mddev, char *page)
3718 return sprintf(page, "%llu\n",
3719 (unsigned long long) mddev->resync_mismatches);
3722 static struct md_sysfs_entry md_scan_mode =
3723 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3726 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3729 sync_min_show(mddev_t *mddev, char *page)
3731 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3732 mddev->sync_speed_min ? "local": "system");
3736 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3740 if (strncmp(buf, "system", 6)==0) {
3741 mddev->sync_speed_min = 0;
3744 min = simple_strtoul(buf, &e, 10);
3745 if (buf == e || (*e && *e != '\n') || min <= 0)
3747 mddev->sync_speed_min = min;
3751 static struct md_sysfs_entry md_sync_min =
3752 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3755 sync_max_show(mddev_t *mddev, char *page)
3757 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3758 mddev->sync_speed_max ? "local": "system");
3762 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3766 if (strncmp(buf, "system", 6)==0) {
3767 mddev->sync_speed_max = 0;
3770 max = simple_strtoul(buf, &e, 10);
3771 if (buf == e || (*e && *e != '\n') || max <= 0)
3773 mddev->sync_speed_max = max;
3777 static struct md_sysfs_entry md_sync_max =
3778 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3781 degraded_show(mddev_t *mddev, char *page)
3783 return sprintf(page, "%d\n", mddev->degraded);
3785 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3788 sync_force_parallel_show(mddev_t *mddev, char *page)
3790 return sprintf(page, "%d\n", mddev->parallel_resync);
3794 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3798 if (strict_strtol(buf, 10, &n))
3801 if (n != 0 && n != 1)
3804 mddev->parallel_resync = n;
3806 if (mddev->sync_thread)
3807 wake_up(&resync_wait);
3812 /* force parallel resync, even with shared block devices */
3813 static struct md_sysfs_entry md_sync_force_parallel =
3814 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3815 sync_force_parallel_show, sync_force_parallel_store);
3818 sync_speed_show(mddev_t *mddev, char *page)
3820 unsigned long resync, dt, db;
3821 if (mddev->curr_resync == 0)
3822 return sprintf(page, "none\n");
3823 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3824 dt = (jiffies - mddev->resync_mark) / HZ;
3826 db = resync - mddev->resync_mark_cnt;
3827 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3830 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3833 sync_completed_show(mddev_t *mddev, char *page)
3835 unsigned long max_sectors, resync;
3837 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3838 return sprintf(page, "none\n");
3840 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3841 max_sectors = mddev->resync_max_sectors;
3843 max_sectors = mddev->dev_sectors;
3845 resync = mddev->curr_resync_completed;
3846 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3849 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3852 min_sync_show(mddev_t *mddev, char *page)
3854 return sprintf(page, "%llu\n",
3855 (unsigned long long)mddev->resync_min);
3858 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3860 unsigned long long min;
3861 if (strict_strtoull(buf, 10, &min))
3863 if (min > mddev->resync_max)
3865 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3868 /* Must be a multiple of chunk_size */
3869 if (mddev->chunk_sectors) {
3870 sector_t temp = min;
3871 if (sector_div(temp, mddev->chunk_sectors))
3874 mddev->resync_min = min;
3879 static struct md_sysfs_entry md_min_sync =
3880 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3883 max_sync_show(mddev_t *mddev, char *page)
3885 if (mddev->resync_max == MaxSector)
3886 return sprintf(page, "max\n");
3888 return sprintf(page, "%llu\n",
3889 (unsigned long long)mddev->resync_max);
3892 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3894 if (strncmp(buf, "max", 3) == 0)
3895 mddev->resync_max = MaxSector;
3897 unsigned long long max;
3898 if (strict_strtoull(buf, 10, &max))
3900 if (max < mddev->resync_min)
3902 if (max < mddev->resync_max &&
3904 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3907 /* Must be a multiple of chunk_size */
3908 if (mddev->chunk_sectors) {
3909 sector_t temp = max;
3910 if (sector_div(temp, mddev->chunk_sectors))
3913 mddev->resync_max = max;
3915 wake_up(&mddev->recovery_wait);
3919 static struct md_sysfs_entry md_max_sync =
3920 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3923 suspend_lo_show(mddev_t *mddev, char *page)
3925 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3929 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3932 unsigned long long new = simple_strtoull(buf, &e, 10);
3934 if (mddev->pers == NULL ||
3935 mddev->pers->quiesce == NULL)
3937 if (buf == e || (*e && *e != '\n'))
3939 if (new >= mddev->suspend_hi ||
3940 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3941 mddev->suspend_lo = new;
3942 mddev->pers->quiesce(mddev, 2);
3947 static struct md_sysfs_entry md_suspend_lo =
3948 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3952 suspend_hi_show(mddev_t *mddev, char *page)
3954 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3958 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3961 unsigned long long new = simple_strtoull(buf, &e, 10);
3963 if (mddev->pers == NULL ||
3964 mddev->pers->quiesce == NULL)
3966 if (buf == e || (*e && *e != '\n'))
3968 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3969 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3970 mddev->suspend_hi = new;
3971 mddev->pers->quiesce(mddev, 1);
3972 mddev->pers->quiesce(mddev, 0);
3977 static struct md_sysfs_entry md_suspend_hi =
3978 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3981 reshape_position_show(mddev_t *mddev, char *page)
3983 if (mddev->reshape_position != MaxSector)
3984 return sprintf(page, "%llu\n",
3985 (unsigned long long)mddev->reshape_position);
3986 strcpy(page, "none\n");
3991 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3994 unsigned long long new = simple_strtoull(buf, &e, 10);
3997 if (buf == e || (*e && *e != '\n'))
3999 mddev->reshape_position = new;
4000 mddev->delta_disks = 0;
4001 mddev->new_level = mddev->level;
4002 mddev->new_layout = mddev->layout;
4003 mddev->new_chunk_sectors = mddev->chunk_sectors;
4007 static struct md_sysfs_entry md_reshape_position =
4008 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4009 reshape_position_store);
4012 array_size_show(mddev_t *mddev, char *page)
4014 if (mddev->external_size)
4015 return sprintf(page, "%llu\n",
4016 (unsigned long long)mddev->array_sectors/2);
4018 return sprintf(page, "default\n");
4022 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4026 if (strncmp(buf, "default", 7) == 0) {
4028 sectors = mddev->pers->size(mddev, 0, 0);
4030 sectors = mddev->array_sectors;
4032 mddev->external_size = 0;
4034 if (strict_blocks_to_sectors(buf, §ors) < 0)
4036 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4039 mddev->external_size = 1;
4042 mddev->array_sectors = sectors;
4043 set_capacity(mddev->gendisk, mddev->array_sectors);
4045 revalidate_disk(mddev->gendisk);
4050 static struct md_sysfs_entry md_array_size =
4051 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4054 static struct attribute *md_default_attrs[] = {
4057 &md_raid_disks.attr,
4058 &md_chunk_size.attr,
4060 &md_resync_start.attr,
4062 &md_new_device.attr,
4063 &md_safe_delay.attr,
4064 &md_array_state.attr,
4065 &md_reshape_position.attr,
4066 &md_array_size.attr,
4067 &max_corr_read_errors.attr,
4071 static struct attribute *md_redundancy_attrs[] = {
4073 &md_mismatches.attr,
4076 &md_sync_speed.attr,
4077 &md_sync_force_parallel.attr,
4078 &md_sync_completed.attr,
4081 &md_suspend_lo.attr,
4082 &md_suspend_hi.attr,
4087 static struct attribute_group md_redundancy_group = {
4089 .attrs = md_redundancy_attrs,
4094 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4096 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4097 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4102 rv = mddev_lock(mddev);
4104 rv = entry->show(mddev, page);
4105 mddev_unlock(mddev);
4111 md_attr_store(struct kobject *kobj, struct attribute *attr,
4112 const char *page, size_t length)
4114 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4115 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4120 if (!capable(CAP_SYS_ADMIN))
4122 rv = mddev_lock(mddev);
4123 if (mddev->hold_active == UNTIL_IOCTL)
4124 mddev->hold_active = 0;
4126 rv = entry->store(mddev, page, length);
4127 mddev_unlock(mddev);
4132 static void md_free(struct kobject *ko)
4134 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4136 if (mddev->sysfs_state)
4137 sysfs_put(mddev->sysfs_state);
4139 if (mddev->gendisk) {
4140 del_gendisk(mddev->gendisk);
4141 put_disk(mddev->gendisk);
4144 blk_cleanup_queue(mddev->queue);
4149 static struct sysfs_ops md_sysfs_ops = {
4150 .show = md_attr_show,
4151 .store = md_attr_store,
4153 static struct kobj_type md_ktype = {
4155 .sysfs_ops = &md_sysfs_ops,
4156 .default_attrs = md_default_attrs,
4161 static void mddev_delayed_delete(struct work_struct *ws)
4163 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4165 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4166 kobject_del(&mddev->kobj);
4167 kobject_put(&mddev->kobj);
4170 static int md_alloc(dev_t dev, char *name)
4172 static DEFINE_MUTEX(disks_mutex);
4173 mddev_t *mddev = mddev_find(dev);
4174 struct gendisk *disk;
4183 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4184 shift = partitioned ? MdpMinorShift : 0;
4185 unit = MINOR(mddev->unit) >> shift;
4187 /* wait for any previous instance if this device
4188 * to be completed removed (mddev_delayed_delete).
4190 flush_scheduled_work();
4192 mutex_lock(&disks_mutex);
4198 /* Need to ensure that 'name' is not a duplicate.
4201 spin_lock(&all_mddevs_lock);
4203 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4204 if (mddev2->gendisk &&
4205 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4206 spin_unlock(&all_mddevs_lock);
4209 spin_unlock(&all_mddevs_lock);
4213 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4216 mddev->queue->queuedata = mddev;
4218 /* Can be unlocked because the queue is new: no concurrency */
4219 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4221 blk_queue_make_request(mddev->queue, md_make_request);
4223 disk = alloc_disk(1 << shift);
4225 blk_cleanup_queue(mddev->queue);
4226 mddev->queue = NULL;
4229 disk->major = MAJOR(mddev->unit);
4230 disk->first_minor = unit << shift;
4232 strcpy(disk->disk_name, name);
4233 else if (partitioned)
4234 sprintf(disk->disk_name, "md_d%d", unit);
4236 sprintf(disk->disk_name, "md%d", unit);
4237 disk->fops = &md_fops;
4238 disk->private_data = mddev;
4239 disk->queue = mddev->queue;
4240 /* Allow extended partitions. This makes the
4241 * 'mdp' device redundant, but we can't really
4244 disk->flags |= GENHD_FL_EXT_DEVT;
4246 mddev->gendisk = disk;
4247 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4248 &disk_to_dev(disk)->kobj, "%s", "md");
4250 /* This isn't possible, but as kobject_init_and_add is marked
4251 * __must_check, we must do something with the result
4253 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4257 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4258 printk(KERN_DEBUG "pointless warning\n");
4260 mutex_unlock(&disks_mutex);
4262 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4263 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4269 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4271 md_alloc(dev, NULL);
4275 static int add_named_array(const char *val, struct kernel_param *kp)
4277 /* val must be "md_*" where * is not all digits.
4278 * We allocate an array with a large free minor number, and
4279 * set the name to val. val must not already be an active name.
4281 int len = strlen(val);
4282 char buf[DISK_NAME_LEN];
4284 while (len && val[len-1] == '\n')
4286 if (len >= DISK_NAME_LEN)
4288 strlcpy(buf, val, len+1);
4289 if (strncmp(buf, "md_", 3) != 0)
4291 return md_alloc(0, buf);
4294 static void md_safemode_timeout(unsigned long data)
4296 mddev_t *mddev = (mddev_t *) data;
4298 if (!atomic_read(&mddev->writes_pending)) {
4299 mddev->safemode = 1;
4300 if (mddev->external)
4301 sysfs_notify_dirent(mddev->sysfs_state);
4303 md_wakeup_thread(mddev->thread);
4306 static int start_dirty_degraded;
4308 static int md_run(mddev_t *mddev)
4312 struct mdk_personality *pers;
4314 if (list_empty(&mddev->disks))
4315 /* cannot run an array with no devices.. */
4321 /* These two calls synchronise us with the
4322 * sysfs_remove_group calls in mddev_unlock,
4323 * so they must have completed.
4325 mutex_lock(&mddev->open_mutex);
4326 mutex_unlock(&mddev->open_mutex);
4329 * Analyze all RAID superblock(s)
4331 if (!mddev->raid_disks) {
4332 if (!mddev->persistent)
4337 if (mddev->level != LEVEL_NONE)
4338 request_module("md-level-%d", mddev->level);
4339 else if (mddev->clevel[0])
4340 request_module("md-%s", mddev->clevel);
4343 * Drop all container device buffers, from now on
4344 * the only valid external interface is through the md
4347 list_for_each_entry(rdev, &mddev->disks, same_set) {
4348 if (test_bit(Faulty, &rdev->flags))
4350 sync_blockdev(rdev->bdev);
4351 invalidate_bdev(rdev->bdev);
4353 /* perform some consistency tests on the device.
4354 * We don't want the data to overlap the metadata,
4355 * Internal Bitmap issues have been handled elsewhere.
4357 if (rdev->data_offset < rdev->sb_start) {
4358 if (mddev->dev_sectors &&
4359 rdev->data_offset + mddev->dev_sectors
4361 printk("md: %s: data overlaps metadata\n",
4366 if (rdev->sb_start + rdev->sb_size/512
4367 > rdev->data_offset) {
4368 printk("md: %s: metadata overlaps data\n",
4373 sysfs_notify_dirent(rdev->sysfs_state);
4376 spin_lock(&pers_lock);
4377 pers = find_pers(mddev->level, mddev->clevel);
4378 if (!pers || !try_module_get(pers->owner)) {
4379 spin_unlock(&pers_lock);
4380 if (mddev->level != LEVEL_NONE)
4381 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4384 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4389 spin_unlock(&pers_lock);
4390 if (mddev->level != pers->level) {
4391 mddev->level = pers->level;
4392 mddev->new_level = pers->level;
4394 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4396 if (mddev->reshape_position != MaxSector &&
4397 pers->start_reshape == NULL) {
4398 /* This personality cannot handle reshaping... */
4400 module_put(pers->owner);
4404 if (pers->sync_request) {
4405 /* Warn if this is a potentially silly
4408 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4412 list_for_each_entry(rdev, &mddev->disks, same_set)
4413 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4415 rdev->bdev->bd_contains ==
4416 rdev2->bdev->bd_contains) {
4418 "%s: WARNING: %s appears to be"
4419 " on the same physical disk as"
4422 bdevname(rdev->bdev,b),
4423 bdevname(rdev2->bdev,b2));
4430 "True protection against single-disk"
4431 " failure might be compromised.\n");
4434 mddev->recovery = 0;
4435 /* may be over-ridden by personality */
4436 mddev->resync_max_sectors = mddev->dev_sectors;
4438 mddev->barriers_work = 1;
4439 mddev->ok_start_degraded = start_dirty_degraded;
4441 if (start_readonly && mddev->ro == 0)
4442 mddev->ro = 2; /* read-only, but switch on first write */
4444 err = mddev->pers->run(mddev);
4446 printk(KERN_ERR "md: pers->run() failed ...\n");
4447 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4448 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4449 " but 'external_size' not in effect?\n", __func__);
4451 "md: invalid array_size %llu > default size %llu\n",
4452 (unsigned long long)mddev->array_sectors / 2,
4453 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4455 mddev->pers->stop(mddev);
4457 if (err == 0 && mddev->pers->sync_request) {
4458 err = bitmap_create(mddev);
4460 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4461 mdname(mddev), err);
4462 mddev->pers->stop(mddev);
4466 module_put(mddev->pers->owner);
4468 bitmap_destroy(mddev);
4471 if (mddev->pers->sync_request) {
4472 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4474 "md: cannot register extra attributes for %s\n",
4476 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4477 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4480 atomic_set(&mddev->writes_pending,0);
4481 atomic_set(&mddev->max_corr_read_errors,
4482 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4483 mddev->safemode = 0;
4484 mddev->safemode_timer.function = md_safemode_timeout;
4485 mddev->safemode_timer.data = (unsigned long) mddev;
4486 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4489 list_for_each_entry(rdev, &mddev->disks, same_set)
4490 if (rdev->raid_disk >= 0) {
4492 sprintf(nm, "rd%d", rdev->raid_disk);
4493 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4494 printk("md: cannot register %s for %s\n",
4498 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4501 md_update_sb(mddev, 0);
4503 md_wakeup_thread(mddev->thread);
4504 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4506 md_new_event(mddev);
4507 sysfs_notify_dirent(mddev->sysfs_state);
4508 if (mddev->sysfs_action)
4509 sysfs_notify_dirent(mddev->sysfs_action);
4510 sysfs_notify(&mddev->kobj, NULL, "degraded");
4514 static int do_md_run(mddev_t *mddev)
4518 err = md_run(mddev);
4522 set_capacity(mddev->gendisk, mddev->array_sectors);
4523 revalidate_disk(mddev->gendisk);
4524 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4529 static int restart_array(mddev_t *mddev)
4531 struct gendisk *disk = mddev->gendisk;
4533 /* Complain if it has no devices */
4534 if (list_empty(&mddev->disks))
4540 mddev->safemode = 0;
4542 set_disk_ro(disk, 0);
4543 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4545 /* Kick recovery or resync if necessary */
4546 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4547 md_wakeup_thread(mddev->thread);
4548 md_wakeup_thread(mddev->sync_thread);
4549 sysfs_notify_dirent(mddev->sysfs_state);
4553 /* similar to deny_write_access, but accounts for our holding a reference
4554 * to the file ourselves */
4555 static int deny_bitmap_write_access(struct file * file)
4557 struct inode *inode = file->f_mapping->host;
4559 spin_lock(&inode->i_lock);
4560 if (atomic_read(&inode->i_writecount) > 1) {
4561 spin_unlock(&inode->i_lock);
4564 atomic_set(&inode->i_writecount, -1);
4565 spin_unlock(&inode->i_lock);
4570 void restore_bitmap_write_access(struct file *file)
4572 struct inode *inode = file->f_mapping->host;
4574 spin_lock(&inode->i_lock);
4575 atomic_set(&inode->i_writecount, 1);
4576 spin_unlock(&inode->i_lock);
4579 static void md_clean(mddev_t *mddev)
4581 mddev->array_sectors = 0;
4582 mddev->external_size = 0;
4583 mddev->dev_sectors = 0;
4584 mddev->raid_disks = 0;
4585 mddev->recovery_cp = 0;
4586 mddev->resync_min = 0;
4587 mddev->resync_max = MaxSector;
4588 mddev->reshape_position = MaxSector;
4589 mddev->external = 0;
4590 mddev->persistent = 0;
4591 mddev->level = LEVEL_NONE;
4592 mddev->clevel[0] = 0;
4595 mddev->metadata_type[0] = 0;
4596 mddev->chunk_sectors = 0;
4597 mddev->ctime = mddev->utime = 0;
4599 mddev->max_disks = 0;
4601 mddev->can_decrease_events = 0;
4602 mddev->delta_disks = 0;
4603 mddev->new_level = LEVEL_NONE;
4604 mddev->new_layout = 0;
4605 mddev->new_chunk_sectors = 0;
4606 mddev->curr_resync = 0;
4607 mddev->resync_mismatches = 0;
4608 mddev->suspend_lo = mddev->suspend_hi = 0;
4609 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4610 mddev->recovery = 0;
4612 mddev->degraded = 0;
4613 mddev->barriers_work = 0;
4614 mddev->safemode = 0;
4615 mddev->bitmap_info.offset = 0;
4616 mddev->bitmap_info.default_offset = 0;
4617 mddev->bitmap_info.chunksize = 0;
4618 mddev->bitmap_info.daemon_sleep = 0;
4619 mddev->bitmap_info.max_write_behind = 0;
4622 static void md_stop_writes(mddev_t *mddev)
4624 if (mddev->sync_thread) {
4625 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4626 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4627 md_unregister_thread(mddev->sync_thread);
4628 mddev->sync_thread = NULL;
4631 del_timer_sync(&mddev->safemode_timer);
4633 bitmap_flush(mddev);
4634 md_super_wait(mddev);
4636 if (!mddev->in_sync || mddev->flags) {
4637 /* mark array as shutdown cleanly */
4639 md_update_sb(mddev, 1);
4643 static void md_stop(mddev_t *mddev)
4645 md_stop_writes(mddev);
4647 mddev->pers->stop(mddev);
4648 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4649 mddev->to_remove = &md_redundancy_group;
4650 module_put(mddev->pers->owner);
4652 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4655 static int md_set_readonly(mddev_t *mddev, int is_open)
4658 mutex_lock(&mddev->open_mutex);
4659 if (atomic_read(&mddev->openers) > is_open) {
4660 printk("md: %s still in use.\n",mdname(mddev));
4665 md_stop_writes(mddev);
4671 set_disk_ro(mddev->gendisk, 1);
4672 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4673 sysfs_notify_dirent(mddev->sysfs_state);
4677 mutex_unlock(&mddev->open_mutex);
4682 * 0 - completely stop and dis-assemble array
4683 * 2 - stop but do not disassemble array
4685 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4688 struct gendisk *disk = mddev->gendisk;
4691 mutex_lock(&mddev->open_mutex);
4692 if (atomic_read(&mddev->openers) > is_open) {
4693 printk("md: %s still in use.\n",mdname(mddev));
4695 } else if (mddev->pers) {
4698 set_disk_ro(disk, 0);
4701 mddev->queue->merge_bvec_fn = NULL;
4702 mddev->queue->unplug_fn = NULL;
4703 mddev->queue->backing_dev_info.congested_fn = NULL;
4705 /* tell userspace to handle 'inactive' */
4706 sysfs_notify_dirent(mddev->sysfs_state);
4708 list_for_each_entry(rdev, &mddev->disks, same_set)
4709 if (rdev->raid_disk >= 0) {
4711 sprintf(nm, "rd%d", rdev->raid_disk);
4712 sysfs_remove_link(&mddev->kobj, nm);
4715 set_capacity(disk, 0);
4716 revalidate_disk(disk);
4723 mutex_unlock(&mddev->open_mutex);
4727 * Free resources if final stop
4731 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4733 bitmap_destroy(mddev);
4734 if (mddev->bitmap_info.file) {
4735 restore_bitmap_write_access(mddev->bitmap_info.file);
4736 fput(mddev->bitmap_info.file);
4737 mddev->bitmap_info.file = NULL;
4739 mddev->bitmap_info.offset = 0;
4741 export_array(mddev);
4744 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4745 if (mddev->hold_active == UNTIL_STOP)
4746 mddev->hold_active = 0;
4750 blk_integrity_unregister(disk);
4751 md_new_event(mddev);
4752 sysfs_notify_dirent(mddev->sysfs_state);
4757 static void autorun_array(mddev_t *mddev)
4762 if (list_empty(&mddev->disks))
4765 printk(KERN_INFO "md: running: ");
4767 list_for_each_entry(rdev, &mddev->disks, same_set) {
4768 char b[BDEVNAME_SIZE];
4769 printk("<%s>", bdevname(rdev->bdev,b));
4773 err = do_md_run(mddev);
4775 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4776 do_md_stop(mddev, 0, 0);
4781 * lets try to run arrays based on all disks that have arrived
4782 * until now. (those are in pending_raid_disks)
4784 * the method: pick the first pending disk, collect all disks with
4785 * the same UUID, remove all from the pending list and put them into
4786 * the 'same_array' list. Then order this list based on superblock
4787 * update time (freshest comes first), kick out 'old' disks and
4788 * compare superblocks. If everything's fine then run it.
4790 * If "unit" is allocated, then bump its reference count
4792 static void autorun_devices(int part)
4794 mdk_rdev_t *rdev0, *rdev, *tmp;
4796 char b[BDEVNAME_SIZE];
4798 printk(KERN_INFO "md: autorun ...\n");
4799 while (!list_empty(&pending_raid_disks)) {
4802 LIST_HEAD(candidates);
4803 rdev0 = list_entry(pending_raid_disks.next,
4804 mdk_rdev_t, same_set);
4806 printk(KERN_INFO "md: considering %s ...\n",
4807 bdevname(rdev0->bdev,b));
4808 INIT_LIST_HEAD(&candidates);
4809 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4810 if (super_90_load(rdev, rdev0, 0) >= 0) {
4811 printk(KERN_INFO "md: adding %s ...\n",
4812 bdevname(rdev->bdev,b));
4813 list_move(&rdev->same_set, &candidates);
4816 * now we have a set of devices, with all of them having
4817 * mostly sane superblocks. It's time to allocate the
4821 dev = MKDEV(mdp_major,
4822 rdev0->preferred_minor << MdpMinorShift);
4823 unit = MINOR(dev) >> MdpMinorShift;
4825 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4828 if (rdev0->preferred_minor != unit) {
4829 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4830 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4834 md_probe(dev, NULL, NULL);
4835 mddev = mddev_find(dev);
4836 if (!mddev || !mddev->gendisk) {
4840 "md: cannot allocate memory for md drive.\n");
4843 if (mddev_lock(mddev))
4844 printk(KERN_WARNING "md: %s locked, cannot run\n",
4846 else if (mddev->raid_disks || mddev->major_version
4847 || !list_empty(&mddev->disks)) {
4849 "md: %s already running, cannot run %s\n",
4850 mdname(mddev), bdevname(rdev0->bdev,b));
4851 mddev_unlock(mddev);
4853 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4854 mddev->persistent = 1;
4855 rdev_for_each_list(rdev, tmp, &candidates) {
4856 list_del_init(&rdev->same_set);
4857 if (bind_rdev_to_array(rdev, mddev))
4860 autorun_array(mddev);
4861 mddev_unlock(mddev);
4863 /* on success, candidates will be empty, on error
4866 rdev_for_each_list(rdev, tmp, &candidates) {
4867 list_del_init(&rdev->same_set);
4872 printk(KERN_INFO "md: ... autorun DONE.\n");
4874 #endif /* !MODULE */
4876 static int get_version(void __user * arg)
4880 ver.major = MD_MAJOR_VERSION;
4881 ver.minor = MD_MINOR_VERSION;
4882 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4884 if (copy_to_user(arg, &ver, sizeof(ver)))
4890 static int get_array_info(mddev_t * mddev, void __user * arg)
4892 mdu_array_info_t info;
4893 int nr,working,insync,failed,spare;
4896 nr=working=insync=failed=spare=0;
4897 list_for_each_entry(rdev, &mddev->disks, same_set) {
4899 if (test_bit(Faulty, &rdev->flags))
4903 if (test_bit(In_sync, &rdev->flags))
4910 info.major_version = mddev->major_version;
4911 info.minor_version = mddev->minor_version;
4912 info.patch_version = MD_PATCHLEVEL_VERSION;
4913 info.ctime = mddev->ctime;
4914 info.level = mddev->level;
4915 info.size = mddev->dev_sectors / 2;
4916 if (info.size != mddev->dev_sectors / 2) /* overflow */
4919 info.raid_disks = mddev->raid_disks;
4920 info.md_minor = mddev->md_minor;
4921 info.not_persistent= !mddev->persistent;
4923 info.utime = mddev->utime;
4926 info.state = (1<<MD_SB_CLEAN);
4927 if (mddev->bitmap && mddev->bitmap_info.offset)
4928 info.state = (1<<MD_SB_BITMAP_PRESENT);
4929 info.active_disks = insync;
4930 info.working_disks = working;
4931 info.failed_disks = failed;
4932 info.spare_disks = spare;
4934 info.layout = mddev->layout;
4935 info.chunk_size = mddev->chunk_sectors << 9;
4937 if (copy_to_user(arg, &info, sizeof(info)))
4943 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4945 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4946 char *ptr, *buf = NULL;
4949 if (md_allow_write(mddev))
4950 file = kmalloc(sizeof(*file), GFP_NOIO);
4952 file = kmalloc(sizeof(*file), GFP_KERNEL);
4957 /* bitmap disabled, zero the first byte and copy out */
4958 if (!mddev->bitmap || !mddev->bitmap->file) {
4959 file->pathname[0] = '\0';
4963 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4967 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4971 strcpy(file->pathname, ptr);
4975 if (copy_to_user(arg, file, sizeof(*file)))
4983 static int get_disk_info(mddev_t * mddev, void __user * arg)
4985 mdu_disk_info_t info;
4988 if (copy_from_user(&info, arg, sizeof(info)))
4991 rdev = find_rdev_nr(mddev, info.number);
4993 info.major = MAJOR(rdev->bdev->bd_dev);
4994 info.minor = MINOR(rdev->bdev->bd_dev);
4995 info.raid_disk = rdev->raid_disk;
4997 if (test_bit(Faulty, &rdev->flags))
4998 info.state |= (1<<MD_DISK_FAULTY);
4999 else if (test_bit(In_sync, &rdev->flags)) {
5000 info.state |= (1<<MD_DISK_ACTIVE);
5001 info.state |= (1<<MD_DISK_SYNC);
5003 if (test_bit(WriteMostly, &rdev->flags))
5004 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5006 info.major = info.minor = 0;
5007 info.raid_disk = -1;
5008 info.state = (1<<MD_DISK_REMOVED);
5011 if (copy_to_user(arg, &info, sizeof(info)))
5017 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5019 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5021 dev_t dev = MKDEV(info->major,info->minor);
5023 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5026 if (!mddev->raid_disks) {
5028 /* expecting a device which has a superblock */
5029 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5032 "md: md_import_device returned %ld\n",
5034 return PTR_ERR(rdev);
5036 if (!list_empty(&mddev->disks)) {
5037 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5038 mdk_rdev_t, same_set);
5039 err = super_types[mddev->major_version]
5040 .load_super(rdev, rdev0, mddev->minor_version);
5043 "md: %s has different UUID to %s\n",
5044 bdevname(rdev->bdev,b),
5045 bdevname(rdev0->bdev,b2));
5050 err = bind_rdev_to_array(rdev, mddev);
5057 * add_new_disk can be used once the array is assembled
5058 * to add "hot spares". They must already have a superblock
5063 if (!mddev->pers->hot_add_disk) {
5065 "%s: personality does not support diskops!\n",
5069 if (mddev->persistent)
5070 rdev = md_import_device(dev, mddev->major_version,
5071 mddev->minor_version);
5073 rdev = md_import_device(dev, -1, -1);
5076 "md: md_import_device returned %ld\n",
5078 return PTR_ERR(rdev);
5080 /* set save_raid_disk if appropriate */
5081 if (!mddev->persistent) {
5082 if (info->state & (1<<MD_DISK_SYNC) &&
5083 info->raid_disk < mddev->raid_disks)
5084 rdev->raid_disk = info->raid_disk;
5086 rdev->raid_disk = -1;
5088 super_types[mddev->major_version].
5089 validate_super(mddev, rdev);
5090 rdev->saved_raid_disk = rdev->raid_disk;
5092 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5093 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5094 set_bit(WriteMostly, &rdev->flags);
5096 clear_bit(WriteMostly, &rdev->flags);
5098 rdev->raid_disk = -1;
5099 err = bind_rdev_to_array(rdev, mddev);
5100 if (!err && !mddev->pers->hot_remove_disk) {
5101 /* If there is hot_add_disk but no hot_remove_disk
5102 * then added disks for geometry changes,
5103 * and should be added immediately.
5105 super_types[mddev->major_version].
5106 validate_super(mddev, rdev);
5107 err = mddev->pers->hot_add_disk(mddev, rdev);
5109 unbind_rdev_from_array(rdev);
5114 sysfs_notify_dirent(rdev->sysfs_state);
5116 md_update_sb(mddev, 1);
5117 if (mddev->degraded)
5118 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5119 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5120 md_wakeup_thread(mddev->thread);
5124 /* otherwise, add_new_disk is only allowed
5125 * for major_version==0 superblocks
5127 if (mddev->major_version != 0) {
5128 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5133 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5135 rdev = md_import_device(dev, -1, 0);
5138 "md: error, md_import_device() returned %ld\n",
5140 return PTR_ERR(rdev);
5142 rdev->desc_nr = info->number;
5143 if (info->raid_disk < mddev->raid_disks)
5144 rdev->raid_disk = info->raid_disk;
5146 rdev->raid_disk = -1;
5148 if (rdev->raid_disk < mddev->raid_disks)
5149 if (info->state & (1<<MD_DISK_SYNC))
5150 set_bit(In_sync, &rdev->flags);
5152 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5153 set_bit(WriteMostly, &rdev->flags);
5155 if (!mddev->persistent) {
5156 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5157 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5159 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5160 rdev->sectors = rdev->sb_start;
5162 err = bind_rdev_to_array(rdev, mddev);
5172 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5174 char b[BDEVNAME_SIZE];
5177 rdev = find_rdev(mddev, dev);
5181 if (rdev->raid_disk >= 0)
5184 kick_rdev_from_array(rdev);
5185 md_update_sb(mddev, 1);
5186 md_new_event(mddev);
5190 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5191 bdevname(rdev->bdev,b), mdname(mddev));
5195 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5197 char b[BDEVNAME_SIZE];
5204 if (mddev->major_version != 0) {
5205 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5206 " version-0 superblocks.\n",
5210 if (!mddev->pers->hot_add_disk) {
5212 "%s: personality does not support diskops!\n",
5217 rdev = md_import_device(dev, -1, 0);
5220 "md: error, md_import_device() returned %ld\n",
5225 if (mddev->persistent)
5226 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5228 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5230 rdev->sectors = rdev->sb_start;
5232 if (test_bit(Faulty, &rdev->flags)) {
5234 "md: can not hot-add faulty %s disk to %s!\n",
5235 bdevname(rdev->bdev,b), mdname(mddev));
5239 clear_bit(In_sync, &rdev->flags);
5241 rdev->saved_raid_disk = -1;
5242 err = bind_rdev_to_array(rdev, mddev);
5247 * The rest should better be atomic, we can have disk failures
5248 * noticed in interrupt contexts ...
5251 rdev->raid_disk = -1;
5253 md_update_sb(mddev, 1);
5256 * Kick recovery, maybe this spare has to be added to the
5257 * array immediately.
5259 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5260 md_wakeup_thread(mddev->thread);
5261 md_new_event(mddev);
5269 static int set_bitmap_file(mddev_t *mddev, int fd)
5274 if (!mddev->pers->quiesce)
5276 if (mddev->recovery || mddev->sync_thread)
5278 /* we should be able to change the bitmap.. */
5284 return -EEXIST; /* cannot add when bitmap is present */
5285 mddev->bitmap_info.file = fget(fd);
5287 if (mddev->bitmap_info.file == NULL) {
5288 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5293 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5295 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5297 fput(mddev->bitmap_info.file);
5298 mddev->bitmap_info.file = NULL;
5301 mddev->bitmap_info.offset = 0; /* file overrides offset */
5302 } else if (mddev->bitmap == NULL)
5303 return -ENOENT; /* cannot remove what isn't there */
5306 mddev->pers->quiesce(mddev, 1);
5308 err = bitmap_create(mddev);
5309 if (fd < 0 || err) {
5310 bitmap_destroy(mddev);
5311 fd = -1; /* make sure to put the file */
5313 mddev->pers->quiesce(mddev, 0);
5316 if (mddev->bitmap_info.file) {
5317 restore_bitmap_write_access(mddev->bitmap_info.file);
5318 fput(mddev->bitmap_info.file);
5320 mddev->bitmap_info.file = NULL;
5327 * set_array_info is used two different ways
5328 * The original usage is when creating a new array.
5329 * In this usage, raid_disks is > 0 and it together with
5330 * level, size, not_persistent,layout,chunksize determine the
5331 * shape of the array.
5332 * This will always create an array with a type-0.90.0 superblock.
5333 * The newer usage is when assembling an array.
5334 * In this case raid_disks will be 0, and the major_version field is
5335 * use to determine which style super-blocks are to be found on the devices.
5336 * The minor and patch _version numbers are also kept incase the
5337 * super_block handler wishes to interpret them.
5339 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5342 if (info->raid_disks == 0) {
5343 /* just setting version number for superblock loading */
5344 if (info->major_version < 0 ||
5345 info->major_version >= ARRAY_SIZE(super_types) ||
5346 super_types[info->major_version].name == NULL) {
5347 /* maybe try to auto-load a module? */
5349 "md: superblock version %d not known\n",
5350 info->major_version);
5353 mddev->major_version = info->major_version;
5354 mddev->minor_version = info->minor_version;
5355 mddev->patch_version = info->patch_version;
5356 mddev->persistent = !info->not_persistent;
5357 /* ensure mddev_put doesn't delete this now that there
5358 * is some minimal configuration.
5360 mddev->ctime = get_seconds();
5363 mddev->major_version = MD_MAJOR_VERSION;
5364 mddev->minor_version = MD_MINOR_VERSION;
5365 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5366 mddev->ctime = get_seconds();
5368 mddev->level = info->level;
5369 mddev->clevel[0] = 0;
5370 mddev->dev_sectors = 2 * (sector_t)info->size;
5371 mddev->raid_disks = info->raid_disks;
5372 /* don't set md_minor, it is determined by which /dev/md* was
5375 if (info->state & (1<<MD_SB_CLEAN))
5376 mddev->recovery_cp = MaxSector;
5378 mddev->recovery_cp = 0;
5379 mddev->persistent = ! info->not_persistent;
5380 mddev->external = 0;
5382 mddev->layout = info->layout;
5383 mddev->chunk_sectors = info->chunk_size >> 9;
5385 mddev->max_disks = MD_SB_DISKS;
5387 if (mddev->persistent)
5389 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5391 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5392 mddev->bitmap_info.offset = 0;
5394 mddev->reshape_position = MaxSector;
5397 * Generate a 128 bit UUID
5399 get_random_bytes(mddev->uuid, 16);
5401 mddev->new_level = mddev->level;
5402 mddev->new_chunk_sectors = mddev->chunk_sectors;
5403 mddev->new_layout = mddev->layout;
5404 mddev->delta_disks = 0;
5409 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5411 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5413 if (mddev->external_size)
5416 mddev->array_sectors = array_sectors;
5418 EXPORT_SYMBOL(md_set_array_sectors);
5420 static int update_size(mddev_t *mddev, sector_t num_sectors)
5424 int fit = (num_sectors == 0);
5426 if (mddev->pers->resize == NULL)
5428 /* The "num_sectors" is the number of sectors of each device that
5429 * is used. This can only make sense for arrays with redundancy.
5430 * linear and raid0 always use whatever space is available. We can only
5431 * consider changing this number if no resync or reconstruction is
5432 * happening, and if the new size is acceptable. It must fit before the
5433 * sb_start or, if that is <data_offset, it must fit before the size
5434 * of each device. If num_sectors is zero, we find the largest size
5438 if (mddev->sync_thread)
5441 /* Sorry, cannot grow a bitmap yet, just remove it,
5445 list_for_each_entry(rdev, &mddev->disks, same_set) {
5446 sector_t avail = rdev->sectors;
5448 if (fit && (num_sectors == 0 || num_sectors > avail))
5449 num_sectors = avail;
5450 if (avail < num_sectors)
5453 rv = mddev->pers->resize(mddev, num_sectors);
5455 revalidate_disk(mddev->gendisk);
5459 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5462 /* change the number of raid disks */
5463 if (mddev->pers->check_reshape == NULL)
5465 if (raid_disks <= 0 ||
5466 (mddev->max_disks && raid_disks >= mddev->max_disks))
5468 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5470 mddev->delta_disks = raid_disks - mddev->raid_disks;
5472 rv = mddev->pers->check_reshape(mddev);
5478 * update_array_info is used to change the configuration of an
5480 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5481 * fields in the info are checked against the array.
5482 * Any differences that cannot be handled will cause an error.
5483 * Normally, only one change can be managed at a time.
5485 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5491 /* calculate expected state,ignoring low bits */
5492 if (mddev->bitmap && mddev->bitmap_info.offset)
5493 state |= (1 << MD_SB_BITMAP_PRESENT);
5495 if (mddev->major_version != info->major_version ||
5496 mddev->minor_version != info->minor_version ||
5497 /* mddev->patch_version != info->patch_version || */
5498 mddev->ctime != info->ctime ||
5499 mddev->level != info->level ||
5500 /* mddev->layout != info->layout || */
5501 !mddev->persistent != info->not_persistent||
5502 mddev->chunk_sectors != info->chunk_size >> 9 ||
5503 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5504 ((state^info->state) & 0xfffffe00)
5507 /* Check there is only one change */
5508 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5510 if (mddev->raid_disks != info->raid_disks)
5512 if (mddev->layout != info->layout)
5514 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5521 if (mddev->layout != info->layout) {
5523 * we don't need to do anything at the md level, the
5524 * personality will take care of it all.
5526 if (mddev->pers->check_reshape == NULL)
5529 mddev->new_layout = info->layout;
5530 rv = mddev->pers->check_reshape(mddev);
5532 mddev->new_layout = mddev->layout;
5536 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5537 rv = update_size(mddev, (sector_t)info->size * 2);
5539 if (mddev->raid_disks != info->raid_disks)
5540 rv = update_raid_disks(mddev, info->raid_disks);
5542 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5543 if (mddev->pers->quiesce == NULL)
5545 if (mddev->recovery || mddev->sync_thread)
5547 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5548 /* add the bitmap */
5551 if (mddev->bitmap_info.default_offset == 0)
5553 mddev->bitmap_info.offset =
5554 mddev->bitmap_info.default_offset;
5555 mddev->pers->quiesce(mddev, 1);
5556 rv = bitmap_create(mddev);
5558 bitmap_destroy(mddev);
5559 mddev->pers->quiesce(mddev, 0);
5561 /* remove the bitmap */
5564 if (mddev->bitmap->file)
5566 mddev->pers->quiesce(mddev, 1);
5567 bitmap_destroy(mddev);
5568 mddev->pers->quiesce(mddev, 0);
5569 mddev->bitmap_info.offset = 0;
5572 md_update_sb(mddev, 1);
5576 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5580 if (mddev->pers == NULL)
5583 rdev = find_rdev(mddev, dev);
5587 md_error(mddev, rdev);
5592 * We have a problem here : there is no easy way to give a CHS
5593 * virtual geometry. We currently pretend that we have a 2 heads
5594 * 4 sectors (with a BIG number of cylinders...). This drives
5595 * dosfs just mad... ;-)
5597 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5599 mddev_t *mddev = bdev->bd_disk->private_data;
5603 geo->cylinders = mddev->array_sectors / 8;
5607 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5608 unsigned int cmd, unsigned long arg)
5611 void __user *argp = (void __user *)arg;
5612 mddev_t *mddev = NULL;
5615 if (!capable(CAP_SYS_ADMIN))
5619 * Commands dealing with the RAID driver but not any
5625 err = get_version(argp);
5628 case PRINT_RAID_DEBUG:
5636 autostart_arrays(arg);
5643 * Commands creating/starting a new array:
5646 mddev = bdev->bd_disk->private_data;
5653 err = mddev_lock(mddev);
5656 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5663 case SET_ARRAY_INFO:
5665 mdu_array_info_t info;
5667 memset(&info, 0, sizeof(info));
5668 else if (copy_from_user(&info, argp, sizeof(info))) {
5673 err = update_array_info(mddev, &info);
5675 printk(KERN_WARNING "md: couldn't update"
5676 " array info. %d\n", err);
5681 if (!list_empty(&mddev->disks)) {
5683 "md: array %s already has disks!\n",
5688 if (mddev->raid_disks) {
5690 "md: array %s already initialised!\n",
5695 err = set_array_info(mddev, &info);
5697 printk(KERN_WARNING "md: couldn't set"
5698 " array info. %d\n", err);
5708 * Commands querying/configuring an existing array:
5710 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5711 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5712 if ((!mddev->raid_disks && !mddev->external)
5713 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5714 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5715 && cmd != GET_BITMAP_FILE) {
5721 * Commands even a read-only array can execute:
5725 case GET_ARRAY_INFO:
5726 err = get_array_info(mddev, argp);
5729 case GET_BITMAP_FILE:
5730 err = get_bitmap_file(mddev, argp);
5734 err = get_disk_info(mddev, argp);
5737 case RESTART_ARRAY_RW:
5738 err = restart_array(mddev);
5742 err = do_md_stop(mddev, 0, 1);
5746 err = md_set_readonly(mddev, 1);
5750 if (get_user(ro, (int __user *)(arg))) {
5756 /* if the bdev is going readonly the value of mddev->ro
5757 * does not matter, no writes are coming
5762 /* are we are already prepared for writes? */
5766 /* transitioning to readauto need only happen for
5767 * arrays that call md_write_start
5770 err = restart_array(mddev);
5773 set_disk_ro(mddev->gendisk, 0);
5780 * The remaining ioctls are changing the state of the
5781 * superblock, so we do not allow them on read-only arrays.
5782 * However non-MD ioctls (e.g. get-size) will still come through
5783 * here and hit the 'default' below, so only disallow
5784 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5786 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5787 if (mddev->ro == 2) {
5789 sysfs_notify_dirent(mddev->sysfs_state);
5790 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5791 md_wakeup_thread(mddev->thread);
5802 mdu_disk_info_t info;
5803 if (copy_from_user(&info, argp, sizeof(info)))
5806 err = add_new_disk(mddev, &info);
5810 case HOT_REMOVE_DISK:
5811 err = hot_remove_disk(mddev, new_decode_dev(arg));
5815 err = hot_add_disk(mddev, new_decode_dev(arg));
5818 case SET_DISK_FAULTY:
5819 err = set_disk_faulty(mddev, new_decode_dev(arg));
5823 err = do_md_run(mddev);
5826 case SET_BITMAP_FILE:
5827 err = set_bitmap_file(mddev, (int)arg);
5837 if (mddev->hold_active == UNTIL_IOCTL &&
5839 mddev->hold_active = 0;
5840 mddev_unlock(mddev);
5849 #ifdef CONFIG_COMPAT
5850 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5851 unsigned int cmd, unsigned long arg)
5854 case HOT_REMOVE_DISK:
5856 case SET_DISK_FAULTY:
5857 case SET_BITMAP_FILE:
5858 /* These take in integer arg, do not convert */
5861 arg = (unsigned long)compat_ptr(arg);
5865 return md_ioctl(bdev, mode, cmd, arg);
5867 #endif /* CONFIG_COMPAT */
5869 static int md_open(struct block_device *bdev, fmode_t mode)
5872 * Succeed if we can lock the mddev, which confirms that
5873 * it isn't being stopped right now.
5875 mddev_t *mddev = mddev_find(bdev->bd_dev);
5878 if (mddev->gendisk != bdev->bd_disk) {
5879 /* we are racing with mddev_put which is discarding this
5883 /* Wait until bdev->bd_disk is definitely gone */
5884 flush_scheduled_work();
5885 /* Then retry the open from the top */
5886 return -ERESTARTSYS;
5888 BUG_ON(mddev != bdev->bd_disk->private_data);
5890 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5894 atomic_inc(&mddev->openers);
5895 mutex_unlock(&mddev->open_mutex);
5901 static int md_release(struct gendisk *disk, fmode_t mode)
5903 mddev_t *mddev = disk->private_data;
5906 atomic_dec(&mddev->openers);
5911 static const struct block_device_operations md_fops =
5913 .owner = THIS_MODULE,
5915 .release = md_release,
5917 #ifdef CONFIG_COMPAT
5918 .compat_ioctl = md_compat_ioctl,
5920 .getgeo = md_getgeo,
5923 static int md_thread(void * arg)
5925 mdk_thread_t *thread = arg;
5928 * md_thread is a 'system-thread', it's priority should be very
5929 * high. We avoid resource deadlocks individually in each
5930 * raid personality. (RAID5 does preallocation) We also use RR and
5931 * the very same RT priority as kswapd, thus we will never get
5932 * into a priority inversion deadlock.
5934 * we definitely have to have equal or higher priority than
5935 * bdflush, otherwise bdflush will deadlock if there are too
5936 * many dirty RAID5 blocks.
5939 allow_signal(SIGKILL);
5940 while (!kthread_should_stop()) {
5942 /* We need to wait INTERRUPTIBLE so that
5943 * we don't add to the load-average.
5944 * That means we need to be sure no signals are
5947 if (signal_pending(current))
5948 flush_signals(current);
5950 wait_event_interruptible_timeout
5952 test_bit(THREAD_WAKEUP, &thread->flags)
5953 || kthread_should_stop(),
5956 clear_bit(THREAD_WAKEUP, &thread->flags);
5958 thread->run(thread->mddev);
5964 void md_wakeup_thread(mdk_thread_t *thread)
5967 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5968 set_bit(THREAD_WAKEUP, &thread->flags);
5969 wake_up(&thread->wqueue);
5973 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5976 mdk_thread_t *thread;
5978 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5982 init_waitqueue_head(&thread->wqueue);
5985 thread->mddev = mddev;
5986 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5987 thread->tsk = kthread_run(md_thread, thread,
5989 mdname(thread->mddev),
5990 name ?: mddev->pers->name);
5991 if (IS_ERR(thread->tsk)) {
5998 void md_unregister_thread(mdk_thread_t *thread)
6002 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6004 kthread_stop(thread->tsk);
6008 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6015 if (!rdev || test_bit(Faulty, &rdev->flags))
6018 if (mddev->external)
6019 set_bit(Blocked, &rdev->flags);
6021 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6023 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6024 __builtin_return_address(0),__builtin_return_address(1),
6025 __builtin_return_address(2),__builtin_return_address(3));
6029 if (!mddev->pers->error_handler)
6031 mddev->pers->error_handler(mddev,rdev);
6032 if (mddev->degraded)
6033 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6034 sysfs_notify_dirent(rdev->sysfs_state);
6035 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6036 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6037 md_wakeup_thread(mddev->thread);
6038 md_new_event_inintr(mddev);
6041 /* seq_file implementation /proc/mdstat */
6043 static void status_unused(struct seq_file *seq)
6048 seq_printf(seq, "unused devices: ");
6050 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6051 char b[BDEVNAME_SIZE];
6053 seq_printf(seq, "%s ",
6054 bdevname(rdev->bdev,b));
6057 seq_printf(seq, "<none>");
6059 seq_printf(seq, "\n");
6063 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6065 sector_t max_sectors, resync, res;
6066 unsigned long dt, db;
6069 unsigned int per_milli;
6071 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6073 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6074 max_sectors = mddev->resync_max_sectors;
6076 max_sectors = mddev->dev_sectors;
6079 * Should not happen.
6085 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6086 * in a sector_t, and (max_sectors>>scale) will fit in a
6087 * u32, as those are the requirements for sector_div.
6088 * Thus 'scale' must be at least 10
6091 if (sizeof(sector_t) > sizeof(unsigned long)) {
6092 while ( max_sectors/2 > (1ULL<<(scale+32)))
6095 res = (resync>>scale)*1000;
6096 sector_div(res, (u32)((max_sectors>>scale)+1));
6100 int i, x = per_milli/50, y = 20-x;
6101 seq_printf(seq, "[");
6102 for (i = 0; i < x; i++)
6103 seq_printf(seq, "=");
6104 seq_printf(seq, ">");
6105 for (i = 0; i < y; i++)
6106 seq_printf(seq, ".");
6107 seq_printf(seq, "] ");
6109 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6110 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6112 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6114 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6115 "resync" : "recovery"))),
6116 per_milli/10, per_milli % 10,
6117 (unsigned long long) resync/2,
6118 (unsigned long long) max_sectors/2);
6121 * dt: time from mark until now
6122 * db: blocks written from mark until now
6123 * rt: remaining time
6125 * rt is a sector_t, so could be 32bit or 64bit.
6126 * So we divide before multiply in case it is 32bit and close
6128 * We scale the divisor (db) by 32 to avoid loosing precision
6129 * near the end of resync when the number of remaining sectors
6131 * We then divide rt by 32 after multiplying by db to compensate.
6132 * The '+1' avoids division by zero if db is very small.
6134 dt = ((jiffies - mddev->resync_mark) / HZ);
6136 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6137 - mddev->resync_mark_cnt;
6139 rt = max_sectors - resync; /* number of remaining sectors */
6140 sector_div(rt, db/32+1);
6144 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6145 ((unsigned long)rt % 60)/6);
6147 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6150 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6152 struct list_head *tmp;
6162 spin_lock(&all_mddevs_lock);
6163 list_for_each(tmp,&all_mddevs)
6165 mddev = list_entry(tmp, mddev_t, all_mddevs);
6167 spin_unlock(&all_mddevs_lock);
6170 spin_unlock(&all_mddevs_lock);
6172 return (void*)2;/* tail */
6176 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6178 struct list_head *tmp;
6179 mddev_t *next_mddev, *mddev = v;
6185 spin_lock(&all_mddevs_lock);
6187 tmp = all_mddevs.next;
6189 tmp = mddev->all_mddevs.next;
6190 if (tmp != &all_mddevs)
6191 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6193 next_mddev = (void*)2;
6196 spin_unlock(&all_mddevs_lock);
6204 static void md_seq_stop(struct seq_file *seq, void *v)
6208 if (mddev && v != (void*)1 && v != (void*)2)
6212 struct mdstat_info {
6216 static int md_seq_show(struct seq_file *seq, void *v)
6221 struct mdstat_info *mi = seq->private;
6222 struct bitmap *bitmap;
6224 if (v == (void*)1) {
6225 struct mdk_personality *pers;
6226 seq_printf(seq, "Personalities : ");
6227 spin_lock(&pers_lock);
6228 list_for_each_entry(pers, &pers_list, list)
6229 seq_printf(seq, "[%s] ", pers->name);
6231 spin_unlock(&pers_lock);
6232 seq_printf(seq, "\n");
6233 mi->event = atomic_read(&md_event_count);
6236 if (v == (void*)2) {
6241 if (mddev_lock(mddev) < 0)
6244 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6245 seq_printf(seq, "%s : %sactive", mdname(mddev),
6246 mddev->pers ? "" : "in");
6249 seq_printf(seq, " (read-only)");
6251 seq_printf(seq, " (auto-read-only)");
6252 seq_printf(seq, " %s", mddev->pers->name);
6256 list_for_each_entry(rdev, &mddev->disks, same_set) {
6257 char b[BDEVNAME_SIZE];
6258 seq_printf(seq, " %s[%d]",
6259 bdevname(rdev->bdev,b), rdev->desc_nr);
6260 if (test_bit(WriteMostly, &rdev->flags))
6261 seq_printf(seq, "(W)");
6262 if (test_bit(Faulty, &rdev->flags)) {
6263 seq_printf(seq, "(F)");
6265 } else if (rdev->raid_disk < 0)
6266 seq_printf(seq, "(S)"); /* spare */
6267 sectors += rdev->sectors;
6270 if (!list_empty(&mddev->disks)) {
6272 seq_printf(seq, "\n %llu blocks",
6273 (unsigned long long)
6274 mddev->array_sectors / 2);
6276 seq_printf(seq, "\n %llu blocks",
6277 (unsigned long long)sectors / 2);
6279 if (mddev->persistent) {
6280 if (mddev->major_version != 0 ||
6281 mddev->minor_version != 90) {
6282 seq_printf(seq," super %d.%d",
6283 mddev->major_version,
6284 mddev->minor_version);
6286 } else if (mddev->external)
6287 seq_printf(seq, " super external:%s",
6288 mddev->metadata_type);
6290 seq_printf(seq, " super non-persistent");
6293 mddev->pers->status(seq, mddev);
6294 seq_printf(seq, "\n ");
6295 if (mddev->pers->sync_request) {
6296 if (mddev->curr_resync > 2) {
6297 status_resync(seq, mddev);
6298 seq_printf(seq, "\n ");
6299 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6300 seq_printf(seq, "\tresync=DELAYED\n ");
6301 else if (mddev->recovery_cp < MaxSector)
6302 seq_printf(seq, "\tresync=PENDING\n ");
6305 seq_printf(seq, "\n ");
6307 if ((bitmap = mddev->bitmap)) {
6308 unsigned long chunk_kb;
6309 unsigned long flags;
6310 spin_lock_irqsave(&bitmap->lock, flags);
6311 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6312 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6314 bitmap->pages - bitmap->missing_pages,
6316 (bitmap->pages - bitmap->missing_pages)
6317 << (PAGE_SHIFT - 10),
6318 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6319 chunk_kb ? "KB" : "B");
6321 seq_printf(seq, ", file: ");
6322 seq_path(seq, &bitmap->file->f_path, " \t\n");
6325 seq_printf(seq, "\n");
6326 spin_unlock_irqrestore(&bitmap->lock, flags);
6329 seq_printf(seq, "\n");
6331 mddev_unlock(mddev);
6336 static const struct seq_operations md_seq_ops = {
6337 .start = md_seq_start,
6338 .next = md_seq_next,
6339 .stop = md_seq_stop,
6340 .show = md_seq_show,
6343 static int md_seq_open(struct inode *inode, struct file *file)
6346 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6350 error = seq_open(file, &md_seq_ops);
6354 struct seq_file *p = file->private_data;
6356 mi->event = atomic_read(&md_event_count);
6361 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6363 struct seq_file *m = filp->private_data;
6364 struct mdstat_info *mi = m->private;
6367 poll_wait(filp, &md_event_waiters, wait);
6369 /* always allow read */
6370 mask = POLLIN | POLLRDNORM;
6372 if (mi->event != atomic_read(&md_event_count))
6373 mask |= POLLERR | POLLPRI;
6377 static const struct file_operations md_seq_fops = {
6378 .owner = THIS_MODULE,
6379 .open = md_seq_open,
6381 .llseek = seq_lseek,
6382 .release = seq_release_private,
6383 .poll = mdstat_poll,
6386 int register_md_personality(struct mdk_personality *p)
6388 spin_lock(&pers_lock);
6389 list_add_tail(&p->list, &pers_list);
6390 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6391 spin_unlock(&pers_lock);
6395 int unregister_md_personality(struct mdk_personality *p)
6397 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6398 spin_lock(&pers_lock);
6399 list_del_init(&p->list);
6400 spin_unlock(&pers_lock);
6404 static int is_mddev_idle(mddev_t *mddev, int init)
6412 rdev_for_each_rcu(rdev, mddev) {
6413 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6414 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6415 (int)part_stat_read(&disk->part0, sectors[1]) -
6416 atomic_read(&disk->sync_io);
6417 /* sync IO will cause sync_io to increase before the disk_stats
6418 * as sync_io is counted when a request starts, and
6419 * disk_stats is counted when it completes.
6420 * So resync activity will cause curr_events to be smaller than
6421 * when there was no such activity.
6422 * non-sync IO will cause disk_stat to increase without
6423 * increasing sync_io so curr_events will (eventually)
6424 * be larger than it was before. Once it becomes
6425 * substantially larger, the test below will cause
6426 * the array to appear non-idle, and resync will slow
6428 * If there is a lot of outstanding resync activity when
6429 * we set last_event to curr_events, then all that activity
6430 * completing might cause the array to appear non-idle
6431 * and resync will be slowed down even though there might
6432 * not have been non-resync activity. This will only
6433 * happen once though. 'last_events' will soon reflect
6434 * the state where there is little or no outstanding
6435 * resync requests, and further resync activity will
6436 * always make curr_events less than last_events.
6439 if (init || curr_events - rdev->last_events > 64) {
6440 rdev->last_events = curr_events;
6448 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6450 /* another "blocks" (512byte) blocks have been synced */
6451 atomic_sub(blocks, &mddev->recovery_active);
6452 wake_up(&mddev->recovery_wait);
6454 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6455 md_wakeup_thread(mddev->thread);
6456 // stop recovery, signal do_sync ....
6461 /* md_write_start(mddev, bi)
6462 * If we need to update some array metadata (e.g. 'active' flag
6463 * in superblock) before writing, schedule a superblock update
6464 * and wait for it to complete.
6466 void md_write_start(mddev_t *mddev, struct bio *bi)
6469 if (bio_data_dir(bi) != WRITE)
6472 BUG_ON(mddev->ro == 1);
6473 if (mddev->ro == 2) {
6474 /* need to switch to read/write */
6476 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6477 md_wakeup_thread(mddev->thread);
6478 md_wakeup_thread(mddev->sync_thread);
6481 atomic_inc(&mddev->writes_pending);
6482 if (mddev->safemode == 1)
6483 mddev->safemode = 0;
6484 if (mddev->in_sync) {
6485 spin_lock_irq(&mddev->write_lock);
6486 if (mddev->in_sync) {
6488 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6489 md_wakeup_thread(mddev->thread);
6492 spin_unlock_irq(&mddev->write_lock);
6495 sysfs_notify_dirent(mddev->sysfs_state);
6496 wait_event(mddev->sb_wait,
6497 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6498 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6501 void md_write_end(mddev_t *mddev)
6503 if (atomic_dec_and_test(&mddev->writes_pending)) {
6504 if (mddev->safemode == 2)
6505 md_wakeup_thread(mddev->thread);
6506 else if (mddev->safemode_delay)
6507 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6511 /* md_allow_write(mddev)
6512 * Calling this ensures that the array is marked 'active' so that writes
6513 * may proceed without blocking. It is important to call this before
6514 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6515 * Must be called with mddev_lock held.
6517 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6518 * is dropped, so return -EAGAIN after notifying userspace.
6520 int md_allow_write(mddev_t *mddev)
6526 if (!mddev->pers->sync_request)
6529 spin_lock_irq(&mddev->write_lock);
6530 if (mddev->in_sync) {
6532 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6533 if (mddev->safemode_delay &&
6534 mddev->safemode == 0)
6535 mddev->safemode = 1;
6536 spin_unlock_irq(&mddev->write_lock);
6537 md_update_sb(mddev, 0);
6538 sysfs_notify_dirent(mddev->sysfs_state);
6540 spin_unlock_irq(&mddev->write_lock);
6542 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6547 EXPORT_SYMBOL_GPL(md_allow_write);
6549 #define SYNC_MARKS 10
6550 #define SYNC_MARK_STEP (3*HZ)
6551 void md_do_sync(mddev_t *mddev)
6554 unsigned int currspeed = 0,
6556 sector_t max_sectors,j, io_sectors;
6557 unsigned long mark[SYNC_MARKS];
6558 sector_t mark_cnt[SYNC_MARKS];
6560 struct list_head *tmp;
6561 sector_t last_check;
6566 /* just incase thread restarts... */
6567 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6569 if (mddev->ro) /* never try to sync a read-only array */
6572 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6573 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6574 desc = "data-check";
6575 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6576 desc = "requested-resync";
6579 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6584 /* we overload curr_resync somewhat here.
6585 * 0 == not engaged in resync at all
6586 * 2 == checking that there is no conflict with another sync
6587 * 1 == like 2, but have yielded to allow conflicting resync to
6589 * other == active in resync - this many blocks
6591 * Before starting a resync we must have set curr_resync to
6592 * 2, and then checked that every "conflicting" array has curr_resync
6593 * less than ours. When we find one that is the same or higher
6594 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6595 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6596 * This will mean we have to start checking from the beginning again.
6601 mddev->curr_resync = 2;
6604 if (kthread_should_stop())
6605 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6607 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6609 for_each_mddev(mddev2, tmp) {
6610 if (mddev2 == mddev)
6612 if (!mddev->parallel_resync
6613 && mddev2->curr_resync
6614 && match_mddev_units(mddev, mddev2)) {
6616 if (mddev < mddev2 && mddev->curr_resync == 2) {
6617 /* arbitrarily yield */
6618 mddev->curr_resync = 1;
6619 wake_up(&resync_wait);
6621 if (mddev > mddev2 && mddev->curr_resync == 1)
6622 /* no need to wait here, we can wait the next
6623 * time 'round when curr_resync == 2
6626 /* We need to wait 'interruptible' so as not to
6627 * contribute to the load average, and not to
6628 * be caught by 'softlockup'
6630 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6631 if (!kthread_should_stop() &&
6632 mddev2->curr_resync >= mddev->curr_resync) {
6633 printk(KERN_INFO "md: delaying %s of %s"
6634 " until %s has finished (they"
6635 " share one or more physical units)\n",
6636 desc, mdname(mddev), mdname(mddev2));
6638 if (signal_pending(current))
6639 flush_signals(current);
6641 finish_wait(&resync_wait, &wq);
6644 finish_wait(&resync_wait, &wq);
6647 } while (mddev->curr_resync < 2);
6650 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6651 /* resync follows the size requested by the personality,
6652 * which defaults to physical size, but can be virtual size
6654 max_sectors = mddev->resync_max_sectors;
6655 mddev->resync_mismatches = 0;
6656 /* we don't use the checkpoint if there's a bitmap */
6657 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6658 j = mddev->resync_min;
6659 else if (!mddev->bitmap)
6660 j = mddev->recovery_cp;
6662 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6663 max_sectors = mddev->dev_sectors;
6665 /* recovery follows the physical size of devices */
6666 max_sectors = mddev->dev_sectors;
6669 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6670 if (rdev->raid_disk >= 0 &&
6671 !test_bit(Faulty, &rdev->flags) &&
6672 !test_bit(In_sync, &rdev->flags) &&
6673 rdev->recovery_offset < j)
6674 j = rdev->recovery_offset;
6678 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6679 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6680 " %d KB/sec/disk.\n", speed_min(mddev));
6681 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6682 "(but not more than %d KB/sec) for %s.\n",
6683 speed_max(mddev), desc);
6685 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6688 for (m = 0; m < SYNC_MARKS; m++) {
6690 mark_cnt[m] = io_sectors;
6693 mddev->resync_mark = mark[last_mark];
6694 mddev->resync_mark_cnt = mark_cnt[last_mark];
6697 * Tune reconstruction:
6699 window = 32*(PAGE_SIZE/512);
6700 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6701 window/2,(unsigned long long) max_sectors/2);
6703 atomic_set(&mddev->recovery_active, 0);
6708 "md: resuming %s of %s from checkpoint.\n",
6709 desc, mdname(mddev));
6710 mddev->curr_resync = j;
6712 mddev->curr_resync_completed = mddev->curr_resync;
6714 while (j < max_sectors) {
6719 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6720 ((mddev->curr_resync > mddev->curr_resync_completed &&
6721 (mddev->curr_resync - mddev->curr_resync_completed)
6722 > (max_sectors >> 4)) ||
6723 (j - mddev->curr_resync_completed)*2
6724 >= mddev->resync_max - mddev->curr_resync_completed
6726 /* time to update curr_resync_completed */
6727 blk_unplug(mddev->queue);
6728 wait_event(mddev->recovery_wait,
6729 atomic_read(&mddev->recovery_active) == 0);
6730 mddev->curr_resync_completed =
6732 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6733 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6736 while (j >= mddev->resync_max && !kthread_should_stop()) {
6737 /* As this condition is controlled by user-space,
6738 * we can block indefinitely, so use '_interruptible'
6739 * to avoid triggering warnings.
6741 flush_signals(current); /* just in case */
6742 wait_event_interruptible(mddev->recovery_wait,
6743 mddev->resync_max > j
6744 || kthread_should_stop());
6747 if (kthread_should_stop())
6750 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6751 currspeed < speed_min(mddev));
6753 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6757 if (!skipped) { /* actual IO requested */
6758 io_sectors += sectors;
6759 atomic_add(sectors, &mddev->recovery_active);
6763 if (j>1) mddev->curr_resync = j;
6764 mddev->curr_mark_cnt = io_sectors;
6765 if (last_check == 0)
6766 /* this is the earliers that rebuilt will be
6767 * visible in /proc/mdstat
6769 md_new_event(mddev);
6771 if (last_check + window > io_sectors || j == max_sectors)
6774 last_check = io_sectors;
6776 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6780 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6782 int next = (last_mark+1) % SYNC_MARKS;
6784 mddev->resync_mark = mark[next];
6785 mddev->resync_mark_cnt = mark_cnt[next];
6786 mark[next] = jiffies;
6787 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6792 if (kthread_should_stop())
6797 * this loop exits only if either when we are slower than
6798 * the 'hard' speed limit, or the system was IO-idle for
6800 * the system might be non-idle CPU-wise, but we only care
6801 * about not overloading the IO subsystem. (things like an
6802 * e2fsck being done on the RAID array should execute fast)
6804 blk_unplug(mddev->queue);
6807 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6808 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6810 if (currspeed > speed_min(mddev)) {
6811 if ((currspeed > speed_max(mddev)) ||
6812 !is_mddev_idle(mddev, 0)) {
6818 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6820 * this also signals 'finished resyncing' to md_stop
6823 blk_unplug(mddev->queue);
6825 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6827 /* tell personality that we are finished */
6828 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6830 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6831 mddev->curr_resync > 2) {
6832 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6833 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6834 if (mddev->curr_resync >= mddev->recovery_cp) {
6836 "md: checkpointing %s of %s.\n",
6837 desc, mdname(mddev));
6838 mddev->recovery_cp = mddev->curr_resync;
6841 mddev->recovery_cp = MaxSector;
6843 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6844 mddev->curr_resync = MaxSector;
6846 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6847 if (rdev->raid_disk >= 0 &&
6848 !test_bit(Faulty, &rdev->flags) &&
6849 !test_bit(In_sync, &rdev->flags) &&
6850 rdev->recovery_offset < mddev->curr_resync)
6851 rdev->recovery_offset = mddev->curr_resync;
6855 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6858 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6859 /* We completed so min/max setting can be forgotten if used. */
6860 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6861 mddev->resync_min = 0;
6862 mddev->resync_max = MaxSector;
6863 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6864 mddev->resync_min = mddev->curr_resync_completed;
6865 mddev->curr_resync = 0;
6866 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6867 mddev->curr_resync_completed = 0;
6868 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6869 wake_up(&resync_wait);
6870 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6871 md_wakeup_thread(mddev->thread);
6876 * got a signal, exit.
6879 "md: md_do_sync() got signal ... exiting\n");
6880 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6884 EXPORT_SYMBOL_GPL(md_do_sync);
6887 static int remove_and_add_spares(mddev_t *mddev)
6892 mddev->curr_resync_completed = 0;
6894 list_for_each_entry(rdev, &mddev->disks, same_set)
6895 if (rdev->raid_disk >= 0 &&
6896 !test_bit(Blocked, &rdev->flags) &&
6897 (test_bit(Faulty, &rdev->flags) ||
6898 ! test_bit(In_sync, &rdev->flags)) &&
6899 atomic_read(&rdev->nr_pending)==0) {
6900 if (mddev->pers->hot_remove_disk(
6901 mddev, rdev->raid_disk)==0) {
6903 sprintf(nm,"rd%d", rdev->raid_disk);
6904 sysfs_remove_link(&mddev->kobj, nm);
6905 rdev->raid_disk = -1;
6909 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6910 list_for_each_entry(rdev, &mddev->disks, same_set) {
6911 if (rdev->raid_disk >= 0 &&
6912 !test_bit(In_sync, &rdev->flags) &&
6913 !test_bit(Blocked, &rdev->flags))
6915 if (rdev->raid_disk < 0
6916 && !test_bit(Faulty, &rdev->flags)) {
6917 rdev->recovery_offset = 0;
6919 hot_add_disk(mddev, rdev) == 0) {
6921 sprintf(nm, "rd%d", rdev->raid_disk);
6922 if (sysfs_create_link(&mddev->kobj,
6925 "md: cannot register "
6929 md_new_event(mddev);
6930 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6939 * This routine is regularly called by all per-raid-array threads to
6940 * deal with generic issues like resync and super-block update.
6941 * Raid personalities that don't have a thread (linear/raid0) do not
6942 * need this as they never do any recovery or update the superblock.
6944 * It does not do any resync itself, but rather "forks" off other threads
6945 * to do that as needed.
6946 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6947 * "->recovery" and create a thread at ->sync_thread.
6948 * When the thread finishes it sets MD_RECOVERY_DONE
6949 * and wakeups up this thread which will reap the thread and finish up.
6950 * This thread also removes any faulty devices (with nr_pending == 0).
6952 * The overall approach is:
6953 * 1/ if the superblock needs updating, update it.
6954 * 2/ If a recovery thread is running, don't do anything else.
6955 * 3/ If recovery has finished, clean up, possibly marking spares active.
6956 * 4/ If there are any faulty devices, remove them.
6957 * 5/ If array is degraded, try to add spares devices
6958 * 6/ If array has spares or is not in-sync, start a resync thread.
6960 void md_check_recovery(mddev_t *mddev)
6966 bitmap_daemon_work(mddev);
6971 if (signal_pending(current)) {
6972 if (mddev->pers->sync_request && !mddev->external) {
6973 printk(KERN_INFO "md: %s in immediate safe mode\n",
6975 mddev->safemode = 2;
6977 flush_signals(current);
6980 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6983 (mddev->flags && !mddev->external) ||
6984 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6985 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6986 (mddev->external == 0 && mddev->safemode == 1) ||
6987 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6988 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6992 if (mddev_trylock(mddev)) {
6996 /* Only thing we do on a ro array is remove
6999 remove_and_add_spares(mddev);
7000 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7004 if (!mddev->external) {
7006 spin_lock_irq(&mddev->write_lock);
7007 if (mddev->safemode &&
7008 !atomic_read(&mddev->writes_pending) &&
7010 mddev->recovery_cp == MaxSector) {
7013 if (mddev->persistent)
7014 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7016 if (mddev->safemode == 1)
7017 mddev->safemode = 0;
7018 spin_unlock_irq(&mddev->write_lock);
7020 sysfs_notify_dirent(mddev->sysfs_state);
7024 md_update_sb(mddev, 0);
7026 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7027 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7028 /* resync/recovery still happening */
7029 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7032 if (mddev->sync_thread) {
7033 /* resync has finished, collect result */
7034 md_unregister_thread(mddev->sync_thread);
7035 mddev->sync_thread = NULL;
7036 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7037 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7039 /* activate any spares */
7040 if (mddev->pers->spare_active(mddev))
7041 sysfs_notify(&mddev->kobj, NULL,
7044 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7045 mddev->pers->finish_reshape)
7046 mddev->pers->finish_reshape(mddev);
7047 md_update_sb(mddev, 1);
7049 /* if array is no-longer degraded, then any saved_raid_disk
7050 * information must be scrapped
7052 if (!mddev->degraded)
7053 list_for_each_entry(rdev, &mddev->disks, same_set)
7054 rdev->saved_raid_disk = -1;
7056 mddev->recovery = 0;
7057 /* flag recovery needed just to double check */
7058 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7059 sysfs_notify_dirent(mddev->sysfs_action);
7060 md_new_event(mddev);
7063 /* Set RUNNING before clearing NEEDED to avoid
7064 * any transients in the value of "sync_action".
7066 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7067 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7068 /* Clear some bits that don't mean anything, but
7071 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7072 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7074 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7076 /* no recovery is running.
7077 * remove any failed drives, then
7078 * add spares if possible.
7079 * Spare are also removed and re-added, to allow
7080 * the personality to fail the re-add.
7083 if (mddev->reshape_position != MaxSector) {
7084 if (mddev->pers->check_reshape == NULL ||
7085 mddev->pers->check_reshape(mddev) != 0)
7086 /* Cannot proceed */
7088 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7089 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7090 } else if ((spares = remove_and_add_spares(mddev))) {
7091 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7092 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7093 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7094 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7095 } else if (mddev->recovery_cp < MaxSector) {
7096 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7097 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7098 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7099 /* nothing to be done ... */
7102 if (mddev->pers->sync_request) {
7103 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7104 /* We are adding a device or devices to an array
7105 * which has the bitmap stored on all devices.
7106 * So make sure all bitmap pages get written
7108 bitmap_write_all(mddev->bitmap);
7110 mddev->sync_thread = md_register_thread(md_do_sync,
7113 if (!mddev->sync_thread) {
7114 printk(KERN_ERR "%s: could not start resync"
7117 /* leave the spares where they are, it shouldn't hurt */
7118 mddev->recovery = 0;
7120 md_wakeup_thread(mddev->sync_thread);
7121 sysfs_notify_dirent(mddev->sysfs_action);
7122 md_new_event(mddev);
7125 if (!mddev->sync_thread) {
7126 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7127 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7129 if (mddev->sysfs_action)
7130 sysfs_notify_dirent(mddev->sysfs_action);
7132 mddev_unlock(mddev);
7136 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7138 sysfs_notify_dirent(rdev->sysfs_state);
7139 wait_event_timeout(rdev->blocked_wait,
7140 !test_bit(Blocked, &rdev->flags),
7141 msecs_to_jiffies(5000));
7142 rdev_dec_pending(rdev, mddev);
7144 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7146 static int md_notify_reboot(struct notifier_block *this,
7147 unsigned long code, void *x)
7149 struct list_head *tmp;
7152 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7154 printk(KERN_INFO "md: stopping all md devices.\n");
7156 for_each_mddev(mddev, tmp)
7157 if (mddev_trylock(mddev)) {
7158 /* Force a switch to readonly even array
7159 * appears to still be in use. Hence
7162 md_set_readonly(mddev, 100);
7163 mddev_unlock(mddev);
7166 * certain more exotic SCSI devices are known to be
7167 * volatile wrt too early system reboots. While the
7168 * right place to handle this issue is the given
7169 * driver, we do want to have a safe RAID driver ...
7176 static struct notifier_block md_notifier = {
7177 .notifier_call = md_notify_reboot,
7179 .priority = INT_MAX, /* before any real devices */
7182 static void md_geninit(void)
7184 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7186 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7189 static int __init md_init(void)
7191 if (register_blkdev(MD_MAJOR, "md"))
7193 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7194 unregister_blkdev(MD_MAJOR, "md");
7197 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7198 md_probe, NULL, NULL);
7199 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7200 md_probe, NULL, NULL);
7202 register_reboot_notifier(&md_notifier);
7203 raid_table_header = register_sysctl_table(raid_root_table);
7213 * Searches all registered partitions for autorun RAID arrays
7217 static LIST_HEAD(all_detected_devices);
7218 struct detected_devices_node {
7219 struct list_head list;
7223 void md_autodetect_dev(dev_t dev)
7225 struct detected_devices_node *node_detected_dev;
7227 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7228 if (node_detected_dev) {
7229 node_detected_dev->dev = dev;
7230 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7232 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7233 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7238 static void autostart_arrays(int part)
7241 struct detected_devices_node *node_detected_dev;
7243 int i_scanned, i_passed;
7248 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7250 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7252 node_detected_dev = list_entry(all_detected_devices.next,
7253 struct detected_devices_node, list);
7254 list_del(&node_detected_dev->list);
7255 dev = node_detected_dev->dev;
7256 kfree(node_detected_dev);
7257 rdev = md_import_device(dev,0, 90);
7261 if (test_bit(Faulty, &rdev->flags)) {
7265 set_bit(AutoDetected, &rdev->flags);
7266 list_add(&rdev->same_set, &pending_raid_disks);
7270 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7271 i_scanned, i_passed);
7273 autorun_devices(part);
7276 #endif /* !MODULE */
7278 static __exit void md_exit(void)
7281 struct list_head *tmp;
7283 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7284 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7286 unregister_blkdev(MD_MAJOR,"md");
7287 unregister_blkdev(mdp_major, "mdp");
7288 unregister_reboot_notifier(&md_notifier);
7289 unregister_sysctl_table(raid_table_header);
7290 remove_proc_entry("mdstat", NULL);
7291 for_each_mddev(mddev, tmp) {
7292 export_array(mddev);
7293 mddev->hold_active = 0;
7297 subsys_initcall(md_init);
7298 module_exit(md_exit)
7300 static int get_ro(char *buffer, struct kernel_param *kp)
7302 return sprintf(buffer, "%d", start_readonly);
7304 static int set_ro(const char *val, struct kernel_param *kp)
7307 int num = simple_strtoul(val, &e, 10);
7308 if (*val && (*e == '\0' || *e == '\n')) {
7309 start_readonly = num;
7315 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7316 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7318 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7320 EXPORT_SYMBOL(register_md_personality);
7321 EXPORT_SYMBOL(unregister_md_personality);
7322 EXPORT_SYMBOL(md_error);
7323 EXPORT_SYMBOL(md_done_sync);
7324 EXPORT_SYMBOL(md_write_start);
7325 EXPORT_SYMBOL(md_write_end);
7326 EXPORT_SYMBOL(md_register_thread);
7327 EXPORT_SYMBOL(md_unregister_thread);
7328 EXPORT_SYMBOL(md_wakeup_thread);
7329 EXPORT_SYMBOL(md_check_recovery);
7330 MODULE_LICENSE("GPL");
7331 MODULE_DESCRIPTION("MD RAID framework");
7333 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);