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 */
1075 if (ev1 < mddev->events)
1077 } else if (mddev->bitmap) {
1078 /* if adding to array with a bitmap, then we can accept an
1079 * older device ... but not too old.
1081 if (ev1 < mddev->bitmap->events_cleared)
1084 if (ev1 < mddev->events)
1085 /* just a hot-add of a new device, leave raid_disk at -1 */
1089 if (mddev->level != LEVEL_MULTIPATH) {
1090 desc = sb->disks + rdev->desc_nr;
1092 if (desc->state & (1<<MD_DISK_FAULTY))
1093 set_bit(Faulty, &rdev->flags);
1094 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1095 desc->raid_disk < mddev->raid_disks */) {
1096 set_bit(In_sync, &rdev->flags);
1097 rdev->raid_disk = desc->raid_disk;
1098 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1099 /* active but not in sync implies recovery up to
1100 * reshape position. We don't know exactly where
1101 * that is, so set to zero for now */
1102 if (mddev->minor_version >= 91) {
1103 rdev->recovery_offset = 0;
1104 rdev->raid_disk = desc->raid_disk;
1107 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1108 set_bit(WriteMostly, &rdev->flags);
1109 } else /* MULTIPATH are always insync */
1110 set_bit(In_sync, &rdev->flags);
1115 * sync_super for 0.90.0
1117 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1121 int next_spare = mddev->raid_disks;
1124 /* make rdev->sb match mddev data..
1127 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1128 * 3/ any empty disks < next_spare become removed
1130 * disks[0] gets initialised to REMOVED because
1131 * we cannot be sure from other fields if it has
1132 * been initialised or not.
1135 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1137 rdev->sb_size = MD_SB_BYTES;
1139 sb = (mdp_super_t*)page_address(rdev->sb_page);
1141 memset(sb, 0, sizeof(*sb));
1143 sb->md_magic = MD_SB_MAGIC;
1144 sb->major_version = mddev->major_version;
1145 sb->patch_version = mddev->patch_version;
1146 sb->gvalid_words = 0; /* ignored */
1147 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1148 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1149 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1150 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1152 sb->ctime = mddev->ctime;
1153 sb->level = mddev->level;
1154 sb->size = mddev->dev_sectors / 2;
1155 sb->raid_disks = mddev->raid_disks;
1156 sb->md_minor = mddev->md_minor;
1157 sb->not_persistent = 0;
1158 sb->utime = mddev->utime;
1160 sb->events_hi = (mddev->events>>32);
1161 sb->events_lo = (u32)mddev->events;
1163 if (mddev->reshape_position == MaxSector)
1164 sb->minor_version = 90;
1166 sb->minor_version = 91;
1167 sb->reshape_position = mddev->reshape_position;
1168 sb->new_level = mddev->new_level;
1169 sb->delta_disks = mddev->delta_disks;
1170 sb->new_layout = mddev->new_layout;
1171 sb->new_chunk = mddev->new_chunk_sectors << 9;
1173 mddev->minor_version = sb->minor_version;
1176 sb->recovery_cp = mddev->recovery_cp;
1177 sb->cp_events_hi = (mddev->events>>32);
1178 sb->cp_events_lo = (u32)mddev->events;
1179 if (mddev->recovery_cp == MaxSector)
1180 sb->state = (1<< MD_SB_CLEAN);
1182 sb->recovery_cp = 0;
1184 sb->layout = mddev->layout;
1185 sb->chunk_size = mddev->chunk_sectors << 9;
1187 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1188 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1190 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1191 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1194 int is_active = test_bit(In_sync, &rdev2->flags);
1196 if (rdev2->raid_disk >= 0 &&
1197 sb->minor_version >= 91)
1198 /* we have nowhere to store the recovery_offset,
1199 * but if it is not below the reshape_position,
1200 * we can piggy-back on that.
1203 if (rdev2->raid_disk < 0 ||
1204 test_bit(Faulty, &rdev2->flags))
1207 desc_nr = rdev2->raid_disk;
1209 desc_nr = next_spare++;
1210 rdev2->desc_nr = desc_nr;
1211 d = &sb->disks[rdev2->desc_nr];
1213 d->number = rdev2->desc_nr;
1214 d->major = MAJOR(rdev2->bdev->bd_dev);
1215 d->minor = MINOR(rdev2->bdev->bd_dev);
1217 d->raid_disk = rdev2->raid_disk;
1219 d->raid_disk = rdev2->desc_nr; /* compatibility */
1220 if (test_bit(Faulty, &rdev2->flags))
1221 d->state = (1<<MD_DISK_FAULTY);
1222 else if (is_active) {
1223 d->state = (1<<MD_DISK_ACTIVE);
1224 if (test_bit(In_sync, &rdev2->flags))
1225 d->state |= (1<<MD_DISK_SYNC);
1233 if (test_bit(WriteMostly, &rdev2->flags))
1234 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1236 /* now set the "removed" and "faulty" bits on any missing devices */
1237 for (i=0 ; i < mddev->raid_disks ; i++) {
1238 mdp_disk_t *d = &sb->disks[i];
1239 if (d->state == 0 && d->number == 0) {
1242 d->state = (1<<MD_DISK_REMOVED);
1243 d->state |= (1<<MD_DISK_FAULTY);
1247 sb->nr_disks = nr_disks;
1248 sb->active_disks = active;
1249 sb->working_disks = working;
1250 sb->failed_disks = failed;
1251 sb->spare_disks = spare;
1253 sb->this_disk = sb->disks[rdev->desc_nr];
1254 sb->sb_csum = calc_sb_csum(sb);
1258 * rdev_size_change for 0.90.0
1260 static unsigned long long
1261 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1263 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1264 return 0; /* component must fit device */
1265 if (rdev->mddev->bitmap_info.offset)
1266 return 0; /* can't move bitmap */
1267 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1268 if (!num_sectors || num_sectors > rdev->sb_start)
1269 num_sectors = rdev->sb_start;
1270 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1272 md_super_wait(rdev->mddev);
1273 return num_sectors / 2; /* kB for sysfs */
1278 * version 1 superblock
1281 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1285 unsigned long long newcsum;
1286 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1287 __le32 *isuper = (__le32*)sb;
1290 disk_csum = sb->sb_csum;
1293 for (i=0; size>=4; size -= 4 )
1294 newcsum += le32_to_cpu(*isuper++);
1297 newcsum += le16_to_cpu(*(__le16*) isuper);
1299 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1300 sb->sb_csum = disk_csum;
1301 return cpu_to_le32(csum);
1304 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1306 struct mdp_superblock_1 *sb;
1309 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1313 * Calculate the position of the superblock in 512byte sectors.
1314 * It is always aligned to a 4K boundary and
1315 * depeding on minor_version, it can be:
1316 * 0: At least 8K, but less than 12K, from end of device
1317 * 1: At start of device
1318 * 2: 4K from start of device.
1320 switch(minor_version) {
1322 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1324 sb_start &= ~(sector_t)(4*2-1);
1335 rdev->sb_start = sb_start;
1337 /* superblock is rarely larger than 1K, but it can be larger,
1338 * and it is safe to read 4k, so we do that
1340 ret = read_disk_sb(rdev, 4096);
1341 if (ret) return ret;
1344 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1346 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1347 sb->major_version != cpu_to_le32(1) ||
1348 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1349 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1350 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1353 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1354 printk("md: invalid superblock checksum on %s\n",
1355 bdevname(rdev->bdev,b));
1358 if (le64_to_cpu(sb->data_size) < 10) {
1359 printk("md: data_size too small on %s\n",
1360 bdevname(rdev->bdev,b));
1364 rdev->preferred_minor = 0xffff;
1365 rdev->data_offset = le64_to_cpu(sb->data_offset);
1366 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1368 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1369 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1370 if (rdev->sb_size & bmask)
1371 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1374 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1377 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1380 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1386 struct mdp_superblock_1 *refsb =
1387 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1389 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1390 sb->level != refsb->level ||
1391 sb->layout != refsb->layout ||
1392 sb->chunksize != refsb->chunksize) {
1393 printk(KERN_WARNING "md: %s has strangely different"
1394 " superblock to %s\n",
1395 bdevname(rdev->bdev,b),
1396 bdevname(refdev->bdev,b2));
1399 ev1 = le64_to_cpu(sb->events);
1400 ev2 = le64_to_cpu(refsb->events);
1408 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1409 le64_to_cpu(sb->data_offset);
1411 rdev->sectors = rdev->sb_start;
1412 if (rdev->sectors < le64_to_cpu(sb->data_size))
1414 rdev->sectors = le64_to_cpu(sb->data_size);
1415 if (le64_to_cpu(sb->size) > rdev->sectors)
1420 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1422 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1423 __u64 ev1 = le64_to_cpu(sb->events);
1425 rdev->raid_disk = -1;
1426 clear_bit(Faulty, &rdev->flags);
1427 clear_bit(In_sync, &rdev->flags);
1428 clear_bit(WriteMostly, &rdev->flags);
1429 clear_bit(BarriersNotsupp, &rdev->flags);
1431 if (mddev->raid_disks == 0) {
1432 mddev->major_version = 1;
1433 mddev->patch_version = 0;
1434 mddev->external = 0;
1435 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1436 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1437 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1438 mddev->level = le32_to_cpu(sb->level);
1439 mddev->clevel[0] = 0;
1440 mddev->layout = le32_to_cpu(sb->layout);
1441 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1442 mddev->dev_sectors = le64_to_cpu(sb->size);
1443 mddev->events = ev1;
1444 mddev->bitmap_info.offset = 0;
1445 mddev->bitmap_info.default_offset = 1024 >> 9;
1447 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1448 memcpy(mddev->uuid, sb->set_uuid, 16);
1450 mddev->max_disks = (4096-256)/2;
1452 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1453 mddev->bitmap_info.file == NULL )
1454 mddev->bitmap_info.offset =
1455 (__s32)le32_to_cpu(sb->bitmap_offset);
1457 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1458 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1459 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1460 mddev->new_level = le32_to_cpu(sb->new_level);
1461 mddev->new_layout = le32_to_cpu(sb->new_layout);
1462 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1464 mddev->reshape_position = MaxSector;
1465 mddev->delta_disks = 0;
1466 mddev->new_level = mddev->level;
1467 mddev->new_layout = mddev->layout;
1468 mddev->new_chunk_sectors = mddev->chunk_sectors;
1471 } else if (mddev->pers == NULL) {
1472 /* Insist of good event counter while assembling */
1474 if (ev1 < mddev->events)
1476 } else if (mddev->bitmap) {
1477 /* If adding to array with a bitmap, then we can accept an
1478 * older device, but not too old.
1480 if (ev1 < mddev->bitmap->events_cleared)
1483 if (ev1 < mddev->events)
1484 /* just a hot-add of a new device, leave raid_disk at -1 */
1487 if (mddev->level != LEVEL_MULTIPATH) {
1489 if (rdev->desc_nr < 0 ||
1490 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1494 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1496 case 0xffff: /* spare */
1498 case 0xfffe: /* faulty */
1499 set_bit(Faulty, &rdev->flags);
1502 if ((le32_to_cpu(sb->feature_map) &
1503 MD_FEATURE_RECOVERY_OFFSET))
1504 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1506 set_bit(In_sync, &rdev->flags);
1507 rdev->raid_disk = role;
1510 if (sb->devflags & WriteMostly1)
1511 set_bit(WriteMostly, &rdev->flags);
1512 } else /* MULTIPATH are always insync */
1513 set_bit(In_sync, &rdev->flags);
1518 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1520 struct mdp_superblock_1 *sb;
1523 /* make rdev->sb match mddev and rdev data. */
1525 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1527 sb->feature_map = 0;
1529 sb->recovery_offset = cpu_to_le64(0);
1530 memset(sb->pad1, 0, sizeof(sb->pad1));
1531 memset(sb->pad2, 0, sizeof(sb->pad2));
1532 memset(sb->pad3, 0, sizeof(sb->pad3));
1534 sb->utime = cpu_to_le64((__u64)mddev->utime);
1535 sb->events = cpu_to_le64(mddev->events);
1537 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1539 sb->resync_offset = cpu_to_le64(0);
1541 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1543 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1544 sb->size = cpu_to_le64(mddev->dev_sectors);
1545 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1546 sb->level = cpu_to_le32(mddev->level);
1547 sb->layout = cpu_to_le32(mddev->layout);
1549 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1550 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1551 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1554 if (rdev->raid_disk >= 0 &&
1555 !test_bit(In_sync, &rdev->flags)) {
1557 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1558 sb->recovery_offset =
1559 cpu_to_le64(rdev->recovery_offset);
1562 if (mddev->reshape_position != MaxSector) {
1563 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1564 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1565 sb->new_layout = cpu_to_le32(mddev->new_layout);
1566 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1567 sb->new_level = cpu_to_le32(mddev->new_level);
1568 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1572 list_for_each_entry(rdev2, &mddev->disks, same_set)
1573 if (rdev2->desc_nr+1 > max_dev)
1574 max_dev = rdev2->desc_nr+1;
1576 if (max_dev > le32_to_cpu(sb->max_dev)) {
1578 sb->max_dev = cpu_to_le32(max_dev);
1579 rdev->sb_size = max_dev * 2 + 256;
1580 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1581 if (rdev->sb_size & bmask)
1582 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1584 for (i=0; i<max_dev;i++)
1585 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1587 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1589 if (test_bit(Faulty, &rdev2->flags))
1590 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1591 else if (test_bit(In_sync, &rdev2->flags))
1592 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1593 else if (rdev2->raid_disk >= 0)
1594 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1596 sb->dev_roles[i] = cpu_to_le16(0xffff);
1599 sb->sb_csum = calc_sb_1_csum(sb);
1602 static unsigned long long
1603 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1605 struct mdp_superblock_1 *sb;
1606 sector_t max_sectors;
1607 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1608 return 0; /* component must fit device */
1609 if (rdev->sb_start < rdev->data_offset) {
1610 /* minor versions 1 and 2; superblock before data */
1611 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1612 max_sectors -= rdev->data_offset;
1613 if (!num_sectors || num_sectors > max_sectors)
1614 num_sectors = max_sectors;
1615 } else if (rdev->mddev->bitmap_info.offset) {
1616 /* minor version 0 with bitmap we can't move */
1619 /* minor version 0; superblock after data */
1621 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1622 sb_start &= ~(sector_t)(4*2 - 1);
1623 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1624 if (!num_sectors || num_sectors > max_sectors)
1625 num_sectors = max_sectors;
1626 rdev->sb_start = sb_start;
1628 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1629 sb->data_size = cpu_to_le64(num_sectors);
1630 sb->super_offset = rdev->sb_start;
1631 sb->sb_csum = calc_sb_1_csum(sb);
1632 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1634 md_super_wait(rdev->mddev);
1635 return num_sectors / 2; /* kB for sysfs */
1638 static struct super_type super_types[] = {
1641 .owner = THIS_MODULE,
1642 .load_super = super_90_load,
1643 .validate_super = super_90_validate,
1644 .sync_super = super_90_sync,
1645 .rdev_size_change = super_90_rdev_size_change,
1649 .owner = THIS_MODULE,
1650 .load_super = super_1_load,
1651 .validate_super = super_1_validate,
1652 .sync_super = super_1_sync,
1653 .rdev_size_change = super_1_rdev_size_change,
1657 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1659 mdk_rdev_t *rdev, *rdev2;
1662 rdev_for_each_rcu(rdev, mddev1)
1663 rdev_for_each_rcu(rdev2, mddev2)
1664 if (rdev->bdev->bd_contains ==
1665 rdev2->bdev->bd_contains) {
1673 static LIST_HEAD(pending_raid_disks);
1676 * Try to register data integrity profile for an mddev
1678 * This is called when an array is started and after a disk has been kicked
1679 * from the array. It only succeeds if all working and active component devices
1680 * are integrity capable with matching profiles.
1682 int md_integrity_register(mddev_t *mddev)
1684 mdk_rdev_t *rdev, *reference = NULL;
1686 if (list_empty(&mddev->disks))
1687 return 0; /* nothing to do */
1688 if (blk_get_integrity(mddev->gendisk))
1689 return 0; /* already registered */
1690 list_for_each_entry(rdev, &mddev->disks, same_set) {
1691 /* skip spares and non-functional disks */
1692 if (test_bit(Faulty, &rdev->flags))
1694 if (rdev->raid_disk < 0)
1697 * If at least one rdev is not integrity capable, we can not
1698 * enable data integrity for the md device.
1700 if (!bdev_get_integrity(rdev->bdev))
1703 /* Use the first rdev as the reference */
1707 /* does this rdev's profile match the reference profile? */
1708 if (blk_integrity_compare(reference->bdev->bd_disk,
1709 rdev->bdev->bd_disk) < 0)
1713 * All component devices are integrity capable and have matching
1714 * profiles, register the common profile for the md device.
1716 if (blk_integrity_register(mddev->gendisk,
1717 bdev_get_integrity(reference->bdev)) != 0) {
1718 printk(KERN_ERR "md: failed to register integrity for %s\n",
1722 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1726 EXPORT_SYMBOL(md_integrity_register);
1728 /* Disable data integrity if non-capable/non-matching disk is being added */
1729 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1731 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1732 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1734 if (!bi_mddev) /* nothing to do */
1736 if (rdev->raid_disk < 0) /* skip spares */
1738 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1739 rdev->bdev->bd_disk) >= 0)
1741 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1742 blk_integrity_unregister(mddev->gendisk);
1744 EXPORT_SYMBOL(md_integrity_add_rdev);
1746 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1748 char b[BDEVNAME_SIZE];
1758 /* prevent duplicates */
1759 if (find_rdev(mddev, rdev->bdev->bd_dev))
1762 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1763 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1764 rdev->sectors < mddev->dev_sectors)) {
1766 /* Cannot change size, so fail
1767 * If mddev->level <= 0, then we don't care
1768 * about aligning sizes (e.g. linear)
1770 if (mddev->level > 0)
1773 mddev->dev_sectors = rdev->sectors;
1776 /* Verify rdev->desc_nr is unique.
1777 * If it is -1, assign a free number, else
1778 * check number is not in use
1780 if (rdev->desc_nr < 0) {
1782 if (mddev->pers) choice = mddev->raid_disks;
1783 while (find_rdev_nr(mddev, choice))
1785 rdev->desc_nr = choice;
1787 if (find_rdev_nr(mddev, rdev->desc_nr))
1790 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1791 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1792 mdname(mddev), mddev->max_disks);
1795 bdevname(rdev->bdev,b);
1796 while ( (s=strchr(b, '/')) != NULL)
1799 rdev->mddev = mddev;
1800 printk(KERN_INFO "md: bind<%s>\n", b);
1802 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1805 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1806 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1807 kobject_del(&rdev->kobj);
1810 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1812 list_add_rcu(&rdev->same_set, &mddev->disks);
1813 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1815 /* May as well allow recovery to be retried once */
1816 mddev->recovery_disabled = 0;
1821 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1826 static void md_delayed_delete(struct work_struct *ws)
1828 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1829 kobject_del(&rdev->kobj);
1830 kobject_put(&rdev->kobj);
1833 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1835 char b[BDEVNAME_SIZE];
1840 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1841 list_del_rcu(&rdev->same_set);
1842 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1844 sysfs_remove_link(&rdev->kobj, "block");
1845 sysfs_put(rdev->sysfs_state);
1846 rdev->sysfs_state = NULL;
1847 /* We need to delay this, otherwise we can deadlock when
1848 * writing to 'remove' to "dev/state". We also need
1849 * to delay it due to rcu usage.
1852 INIT_WORK(&rdev->del_work, md_delayed_delete);
1853 kobject_get(&rdev->kobj);
1854 schedule_work(&rdev->del_work);
1858 * prevent the device from being mounted, repartitioned or
1859 * otherwise reused by a RAID array (or any other kernel
1860 * subsystem), by bd_claiming the device.
1862 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1865 struct block_device *bdev;
1866 char b[BDEVNAME_SIZE];
1868 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1870 printk(KERN_ERR "md: could not open %s.\n",
1871 __bdevname(dev, b));
1872 return PTR_ERR(bdev);
1874 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1876 printk(KERN_ERR "md: could not bd_claim %s.\n",
1878 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1882 set_bit(AllReserved, &rdev->flags);
1887 static void unlock_rdev(mdk_rdev_t *rdev)
1889 struct block_device *bdev = rdev->bdev;
1894 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1897 void md_autodetect_dev(dev_t dev);
1899 static void export_rdev(mdk_rdev_t * rdev)
1901 char b[BDEVNAME_SIZE];
1902 printk(KERN_INFO "md: export_rdev(%s)\n",
1903 bdevname(rdev->bdev,b));
1908 if (test_bit(AutoDetected, &rdev->flags))
1909 md_autodetect_dev(rdev->bdev->bd_dev);
1912 kobject_put(&rdev->kobj);
1915 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1917 unbind_rdev_from_array(rdev);
1921 static void export_array(mddev_t *mddev)
1923 mdk_rdev_t *rdev, *tmp;
1925 rdev_for_each(rdev, tmp, mddev) {
1930 kick_rdev_from_array(rdev);
1932 if (!list_empty(&mddev->disks))
1934 mddev->raid_disks = 0;
1935 mddev->major_version = 0;
1938 static void print_desc(mdp_disk_t *desc)
1940 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1941 desc->major,desc->minor,desc->raid_disk,desc->state);
1944 static void print_sb_90(mdp_super_t *sb)
1949 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1950 sb->major_version, sb->minor_version, sb->patch_version,
1951 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1953 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1954 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1955 sb->md_minor, sb->layout, sb->chunk_size);
1956 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1957 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1958 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1959 sb->failed_disks, sb->spare_disks,
1960 sb->sb_csum, (unsigned long)sb->events_lo);
1963 for (i = 0; i < MD_SB_DISKS; i++) {
1966 desc = sb->disks + i;
1967 if (desc->number || desc->major || desc->minor ||
1968 desc->raid_disk || (desc->state && (desc->state != 4))) {
1969 printk(" D %2d: ", i);
1973 printk(KERN_INFO "md: THIS: ");
1974 print_desc(&sb->this_disk);
1977 static void print_sb_1(struct mdp_superblock_1 *sb)
1981 uuid = sb->set_uuid;
1983 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1984 "md: Name: \"%s\" CT:%llu\n",
1985 le32_to_cpu(sb->major_version),
1986 le32_to_cpu(sb->feature_map),
1989 (unsigned long long)le64_to_cpu(sb->ctime)
1990 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1992 uuid = sb->device_uuid;
1994 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1996 "md: Dev:%08x UUID: %pU\n"
1997 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1998 "md: (MaxDev:%u) \n",
1999 le32_to_cpu(sb->level),
2000 (unsigned long long)le64_to_cpu(sb->size),
2001 le32_to_cpu(sb->raid_disks),
2002 le32_to_cpu(sb->layout),
2003 le32_to_cpu(sb->chunksize),
2004 (unsigned long long)le64_to_cpu(sb->data_offset),
2005 (unsigned long long)le64_to_cpu(sb->data_size),
2006 (unsigned long long)le64_to_cpu(sb->super_offset),
2007 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2008 le32_to_cpu(sb->dev_number),
2011 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2012 (unsigned long long)le64_to_cpu(sb->events),
2013 (unsigned long long)le64_to_cpu(sb->resync_offset),
2014 le32_to_cpu(sb->sb_csum),
2015 le32_to_cpu(sb->max_dev)
2019 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2021 char b[BDEVNAME_SIZE];
2022 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2023 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2024 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2026 if (rdev->sb_loaded) {
2027 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2028 switch (major_version) {
2030 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2033 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2037 printk(KERN_INFO "md: no rdev superblock!\n");
2040 static void md_print_devices(void)
2042 struct list_head *tmp;
2045 char b[BDEVNAME_SIZE];
2048 printk("md: **********************************\n");
2049 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2050 printk("md: **********************************\n");
2051 for_each_mddev(mddev, tmp) {
2054 bitmap_print_sb(mddev->bitmap);
2056 printk("%s: ", mdname(mddev));
2057 list_for_each_entry(rdev, &mddev->disks, same_set)
2058 printk("<%s>", bdevname(rdev->bdev,b));
2061 list_for_each_entry(rdev, &mddev->disks, same_set)
2062 print_rdev(rdev, mddev->major_version);
2064 printk("md: **********************************\n");
2069 static void sync_sbs(mddev_t * mddev, int nospares)
2071 /* Update each superblock (in-memory image), but
2072 * if we are allowed to, skip spares which already
2073 * have the right event counter, or have one earlier
2074 * (which would mean they aren't being marked as dirty
2075 * with the rest of the array)
2079 /* First make sure individual recovery_offsets are correct */
2080 list_for_each_entry(rdev, &mddev->disks, same_set) {
2081 if (rdev->raid_disk >= 0 &&
2082 !test_bit(In_sync, &rdev->flags) &&
2083 mddev->curr_resync_completed > rdev->recovery_offset)
2084 rdev->recovery_offset = mddev->curr_resync_completed;
2087 list_for_each_entry(rdev, &mddev->disks, same_set) {
2088 if (rdev->sb_events == mddev->events ||
2090 rdev->raid_disk < 0 &&
2091 rdev->sb_events+1 == mddev->events)) {
2092 /* Don't update this superblock */
2093 rdev->sb_loaded = 2;
2095 super_types[mddev->major_version].
2096 sync_super(mddev, rdev);
2097 rdev->sb_loaded = 1;
2102 static void md_update_sb(mddev_t * mddev, int force_change)
2108 mddev->utime = get_seconds();
2109 if (mddev->external)
2112 spin_lock_irq(&mddev->write_lock);
2114 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2115 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2117 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2118 /* just a clean<-> dirty transition, possibly leave spares alone,
2119 * though if events isn't the right even/odd, we will have to do
2125 if (mddev->degraded)
2126 /* If the array is degraded, then skipping spares is both
2127 * dangerous and fairly pointless.
2128 * Dangerous because a device that was removed from the array
2129 * might have a event_count that still looks up-to-date,
2130 * so it can be re-added without a resync.
2131 * Pointless because if there are any spares to skip,
2132 * then a recovery will happen and soon that array won't
2133 * be degraded any more and the spare can go back to sleep then.
2137 sync_req = mddev->in_sync;
2139 /* If this is just a dirty<->clean transition, and the array is clean
2140 * and 'events' is odd, we can roll back to the previous clean state */
2142 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2143 && mddev->can_decrease_events
2144 && mddev->events != 1) {
2146 mddev->can_decrease_events = 0;
2148 /* otherwise we have to go forward and ... */
2150 mddev->can_decrease_events = nospares;
2153 if (!mddev->events) {
2155 * oops, this 64-bit counter should never wrap.
2156 * Either we are in around ~1 trillion A.C., assuming
2157 * 1 reboot per second, or we have a bug:
2164 * do not write anything to disk if using
2165 * nonpersistent superblocks
2167 if (!mddev->persistent) {
2168 if (!mddev->external)
2169 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2171 spin_unlock_irq(&mddev->write_lock);
2172 wake_up(&mddev->sb_wait);
2175 sync_sbs(mddev, nospares);
2176 spin_unlock_irq(&mddev->write_lock);
2179 "md: updating %s RAID superblock on device (in sync %d)\n",
2180 mdname(mddev),mddev->in_sync);
2182 bitmap_update_sb(mddev->bitmap);
2183 list_for_each_entry(rdev, &mddev->disks, same_set) {
2184 char b[BDEVNAME_SIZE];
2185 dprintk(KERN_INFO "md: ");
2186 if (rdev->sb_loaded != 1)
2187 continue; /* no noise on spare devices */
2188 if (test_bit(Faulty, &rdev->flags))
2189 dprintk("(skipping faulty ");
2191 dprintk("%s ", bdevname(rdev->bdev,b));
2192 if (!test_bit(Faulty, &rdev->flags)) {
2193 md_super_write(mddev,rdev,
2194 rdev->sb_start, rdev->sb_size,
2196 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2197 bdevname(rdev->bdev,b),
2198 (unsigned long long)rdev->sb_start);
2199 rdev->sb_events = mddev->events;
2203 if (mddev->level == LEVEL_MULTIPATH)
2204 /* only need to write one superblock... */
2207 md_super_wait(mddev);
2208 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2210 spin_lock_irq(&mddev->write_lock);
2211 if (mddev->in_sync != sync_req ||
2212 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2213 /* have to write it out again */
2214 spin_unlock_irq(&mddev->write_lock);
2217 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2218 spin_unlock_irq(&mddev->write_lock);
2219 wake_up(&mddev->sb_wait);
2220 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2221 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2225 /* words written to sysfs files may, or may not, be \n terminated.
2226 * We want to accept with case. For this we use cmd_match.
2228 static int cmd_match(const char *cmd, const char *str)
2230 /* See if cmd, written into a sysfs file, matches
2231 * str. They must either be the same, or cmd can
2232 * have a trailing newline
2234 while (*cmd && *str && *cmd == *str) {
2245 struct rdev_sysfs_entry {
2246 struct attribute attr;
2247 ssize_t (*show)(mdk_rdev_t *, char *);
2248 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2252 state_show(mdk_rdev_t *rdev, char *page)
2257 if (test_bit(Faulty, &rdev->flags)) {
2258 len+= sprintf(page+len, "%sfaulty",sep);
2261 if (test_bit(In_sync, &rdev->flags)) {
2262 len += sprintf(page+len, "%sin_sync",sep);
2265 if (test_bit(WriteMostly, &rdev->flags)) {
2266 len += sprintf(page+len, "%swrite_mostly",sep);
2269 if (test_bit(Blocked, &rdev->flags)) {
2270 len += sprintf(page+len, "%sblocked", sep);
2273 if (!test_bit(Faulty, &rdev->flags) &&
2274 !test_bit(In_sync, &rdev->flags)) {
2275 len += sprintf(page+len, "%sspare", sep);
2278 return len+sprintf(page+len, "\n");
2282 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2285 * faulty - simulates and error
2286 * remove - disconnects the device
2287 * writemostly - sets write_mostly
2288 * -writemostly - clears write_mostly
2289 * blocked - sets the Blocked flag
2290 * -blocked - clears the Blocked flag
2291 * insync - sets Insync providing device isn't active
2294 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2295 md_error(rdev->mddev, rdev);
2297 } else if (cmd_match(buf, "remove")) {
2298 if (rdev->raid_disk >= 0)
2301 mddev_t *mddev = rdev->mddev;
2302 kick_rdev_from_array(rdev);
2304 md_update_sb(mddev, 1);
2305 md_new_event(mddev);
2308 } else if (cmd_match(buf, "writemostly")) {
2309 set_bit(WriteMostly, &rdev->flags);
2311 } else if (cmd_match(buf, "-writemostly")) {
2312 clear_bit(WriteMostly, &rdev->flags);
2314 } else if (cmd_match(buf, "blocked")) {
2315 set_bit(Blocked, &rdev->flags);
2317 } else if (cmd_match(buf, "-blocked")) {
2318 clear_bit(Blocked, &rdev->flags);
2319 wake_up(&rdev->blocked_wait);
2320 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2321 md_wakeup_thread(rdev->mddev->thread);
2324 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2325 set_bit(In_sync, &rdev->flags);
2328 if (!err && rdev->sysfs_state)
2329 sysfs_notify_dirent(rdev->sysfs_state);
2330 return err ? err : len;
2332 static struct rdev_sysfs_entry rdev_state =
2333 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2336 errors_show(mdk_rdev_t *rdev, char *page)
2338 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2342 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2345 unsigned long n = simple_strtoul(buf, &e, 10);
2346 if (*buf && (*e == 0 || *e == '\n')) {
2347 atomic_set(&rdev->corrected_errors, n);
2352 static struct rdev_sysfs_entry rdev_errors =
2353 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2356 slot_show(mdk_rdev_t *rdev, char *page)
2358 if (rdev->raid_disk < 0)
2359 return sprintf(page, "none\n");
2361 return sprintf(page, "%d\n", rdev->raid_disk);
2365 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2370 int slot = simple_strtoul(buf, &e, 10);
2371 if (strncmp(buf, "none", 4)==0)
2373 else if (e==buf || (*e && *e!= '\n'))
2375 if (rdev->mddev->pers && slot == -1) {
2376 /* Setting 'slot' on an active array requires also
2377 * updating the 'rd%d' link, and communicating
2378 * with the personality with ->hot_*_disk.
2379 * For now we only support removing
2380 * failed/spare devices. This normally happens automatically,
2381 * but not when the metadata is externally managed.
2383 if (rdev->raid_disk == -1)
2385 /* personality does all needed checks */
2386 if (rdev->mddev->pers->hot_add_disk == NULL)
2388 err = rdev->mddev->pers->
2389 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2392 sprintf(nm, "rd%d", rdev->raid_disk);
2393 sysfs_remove_link(&rdev->mddev->kobj, nm);
2394 rdev->raid_disk = -1;
2395 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2396 md_wakeup_thread(rdev->mddev->thread);
2397 } else if (rdev->mddev->pers) {
2399 /* Activating a spare .. or possibly reactivating
2400 * if we ever get bitmaps working here.
2403 if (rdev->raid_disk != -1)
2406 if (rdev->mddev->pers->hot_add_disk == NULL)
2409 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2410 if (rdev2->raid_disk == slot)
2413 rdev->raid_disk = slot;
2414 if (test_bit(In_sync, &rdev->flags))
2415 rdev->saved_raid_disk = slot;
2417 rdev->saved_raid_disk = -1;
2418 err = rdev->mddev->pers->
2419 hot_add_disk(rdev->mddev, rdev);
2421 rdev->raid_disk = -1;
2424 sysfs_notify_dirent(rdev->sysfs_state);
2425 sprintf(nm, "rd%d", rdev->raid_disk);
2426 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2428 "md: cannot register "
2430 nm, mdname(rdev->mddev));
2432 /* don't wakeup anyone, leave that to userspace. */
2434 if (slot >= rdev->mddev->raid_disks)
2436 rdev->raid_disk = slot;
2437 /* assume it is working */
2438 clear_bit(Faulty, &rdev->flags);
2439 clear_bit(WriteMostly, &rdev->flags);
2440 set_bit(In_sync, &rdev->flags);
2441 sysfs_notify_dirent(rdev->sysfs_state);
2447 static struct rdev_sysfs_entry rdev_slot =
2448 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2451 offset_show(mdk_rdev_t *rdev, char *page)
2453 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2457 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2460 unsigned long long offset = simple_strtoull(buf, &e, 10);
2461 if (e==buf || (*e && *e != '\n'))
2463 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2465 if (rdev->sectors && rdev->mddev->external)
2466 /* Must set offset before size, so overlap checks
2469 rdev->data_offset = offset;
2473 static struct rdev_sysfs_entry rdev_offset =
2474 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2477 rdev_size_show(mdk_rdev_t *rdev, char *page)
2479 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2482 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2484 /* check if two start/length pairs overlap */
2492 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2494 unsigned long long blocks;
2497 if (strict_strtoull(buf, 10, &blocks) < 0)
2500 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2501 return -EINVAL; /* sector conversion overflow */
2504 if (new != blocks * 2)
2505 return -EINVAL; /* unsigned long long to sector_t overflow */
2512 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2514 mddev_t *my_mddev = rdev->mddev;
2515 sector_t oldsectors = rdev->sectors;
2518 if (strict_blocks_to_sectors(buf, §ors) < 0)
2520 if (my_mddev->pers && rdev->raid_disk >= 0) {
2521 if (my_mddev->persistent) {
2522 sectors = super_types[my_mddev->major_version].
2523 rdev_size_change(rdev, sectors);
2526 } else if (!sectors)
2527 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2530 if (sectors < my_mddev->dev_sectors)
2531 return -EINVAL; /* component must fit device */
2533 rdev->sectors = sectors;
2534 if (sectors > oldsectors && my_mddev->external) {
2535 /* need to check that all other rdevs with the same ->bdev
2536 * do not overlap. We need to unlock the mddev to avoid
2537 * a deadlock. We have already changed rdev->sectors, and if
2538 * we have to change it back, we will have the lock again.
2542 struct list_head *tmp;
2544 mddev_unlock(my_mddev);
2545 for_each_mddev(mddev, tmp) {
2549 list_for_each_entry(rdev2, &mddev->disks, same_set)
2550 if (test_bit(AllReserved, &rdev2->flags) ||
2551 (rdev->bdev == rdev2->bdev &&
2553 overlaps(rdev->data_offset, rdev->sectors,
2559 mddev_unlock(mddev);
2565 mddev_lock(my_mddev);
2567 /* Someone else could have slipped in a size
2568 * change here, but doing so is just silly.
2569 * We put oldsectors back because we *know* it is
2570 * safe, and trust userspace not to race with
2573 rdev->sectors = oldsectors;
2580 static struct rdev_sysfs_entry rdev_size =
2581 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2584 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2586 unsigned long long recovery_start = rdev->recovery_offset;
2588 if (test_bit(In_sync, &rdev->flags) ||
2589 recovery_start == MaxSector)
2590 return sprintf(page, "none\n");
2592 return sprintf(page, "%llu\n", recovery_start);
2595 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2597 unsigned long long recovery_start;
2599 if (cmd_match(buf, "none"))
2600 recovery_start = MaxSector;
2601 else if (strict_strtoull(buf, 10, &recovery_start))
2604 if (rdev->mddev->pers &&
2605 rdev->raid_disk >= 0)
2608 rdev->recovery_offset = recovery_start;
2609 if (recovery_start == MaxSector)
2610 set_bit(In_sync, &rdev->flags);
2612 clear_bit(In_sync, &rdev->flags);
2616 static struct rdev_sysfs_entry rdev_recovery_start =
2617 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2619 static struct attribute *rdev_default_attrs[] = {
2625 &rdev_recovery_start.attr,
2629 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2631 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2632 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2633 mddev_t *mddev = rdev->mddev;
2639 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2641 if (rdev->mddev == NULL)
2644 rv = entry->show(rdev, page);
2645 mddev_unlock(mddev);
2651 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2652 const char *page, size_t length)
2654 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2655 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2657 mddev_t *mddev = rdev->mddev;
2661 if (!capable(CAP_SYS_ADMIN))
2663 rv = mddev ? mddev_lock(mddev): -EBUSY;
2665 if (rdev->mddev == NULL)
2668 rv = entry->store(rdev, page, length);
2669 mddev_unlock(mddev);
2674 static void rdev_free(struct kobject *ko)
2676 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2679 static struct sysfs_ops rdev_sysfs_ops = {
2680 .show = rdev_attr_show,
2681 .store = rdev_attr_store,
2683 static struct kobj_type rdev_ktype = {
2684 .release = rdev_free,
2685 .sysfs_ops = &rdev_sysfs_ops,
2686 .default_attrs = rdev_default_attrs,
2690 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2692 * mark the device faulty if:
2694 * - the device is nonexistent (zero size)
2695 * - the device has no valid superblock
2697 * a faulty rdev _never_ has rdev->sb set.
2699 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2701 char b[BDEVNAME_SIZE];
2706 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2708 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2709 return ERR_PTR(-ENOMEM);
2712 if ((err = alloc_disk_sb(rdev)))
2715 err = lock_rdev(rdev, newdev, super_format == -2);
2719 kobject_init(&rdev->kobj, &rdev_ktype);
2722 rdev->saved_raid_disk = -1;
2723 rdev->raid_disk = -1;
2725 rdev->data_offset = 0;
2726 rdev->sb_events = 0;
2727 rdev->last_read_error.tv_sec = 0;
2728 rdev->last_read_error.tv_nsec = 0;
2729 atomic_set(&rdev->nr_pending, 0);
2730 atomic_set(&rdev->read_errors, 0);
2731 atomic_set(&rdev->corrected_errors, 0);
2733 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2736 "md: %s has zero or unknown size, marking faulty!\n",
2737 bdevname(rdev->bdev,b));
2742 if (super_format >= 0) {
2743 err = super_types[super_format].
2744 load_super(rdev, NULL, super_minor);
2745 if (err == -EINVAL) {
2747 "md: %s does not have a valid v%d.%d "
2748 "superblock, not importing!\n",
2749 bdevname(rdev->bdev,b),
2750 super_format, super_minor);
2755 "md: could not read %s's sb, not importing!\n",
2756 bdevname(rdev->bdev,b));
2761 INIT_LIST_HEAD(&rdev->same_set);
2762 init_waitqueue_head(&rdev->blocked_wait);
2767 if (rdev->sb_page) {
2773 return ERR_PTR(err);
2777 * Check a full RAID array for plausibility
2781 static void analyze_sbs(mddev_t * mddev)
2784 mdk_rdev_t *rdev, *freshest, *tmp;
2785 char b[BDEVNAME_SIZE];
2788 rdev_for_each(rdev, tmp, mddev)
2789 switch (super_types[mddev->major_version].
2790 load_super(rdev, freshest, mddev->minor_version)) {
2798 "md: fatal superblock inconsistency in %s"
2799 " -- removing from array\n",
2800 bdevname(rdev->bdev,b));
2801 kick_rdev_from_array(rdev);
2805 super_types[mddev->major_version].
2806 validate_super(mddev, freshest);
2809 rdev_for_each(rdev, tmp, mddev) {
2810 if (mddev->max_disks &&
2811 (rdev->desc_nr >= mddev->max_disks ||
2812 i > mddev->max_disks)) {
2814 "md: %s: %s: only %d devices permitted\n",
2815 mdname(mddev), bdevname(rdev->bdev, b),
2817 kick_rdev_from_array(rdev);
2820 if (rdev != freshest)
2821 if (super_types[mddev->major_version].
2822 validate_super(mddev, rdev)) {
2823 printk(KERN_WARNING "md: kicking non-fresh %s"
2825 bdevname(rdev->bdev,b));
2826 kick_rdev_from_array(rdev);
2829 if (mddev->level == LEVEL_MULTIPATH) {
2830 rdev->desc_nr = i++;
2831 rdev->raid_disk = rdev->desc_nr;
2832 set_bit(In_sync, &rdev->flags);
2833 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2834 rdev->raid_disk = -1;
2835 clear_bit(In_sync, &rdev->flags);
2840 /* Read a fixed-point number.
2841 * Numbers in sysfs attributes should be in "standard" units where
2842 * possible, so time should be in seconds.
2843 * However we internally use a a much smaller unit such as
2844 * milliseconds or jiffies.
2845 * This function takes a decimal number with a possible fractional
2846 * component, and produces an integer which is the result of
2847 * multiplying that number by 10^'scale'.
2848 * all without any floating-point arithmetic.
2850 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2852 unsigned long result = 0;
2854 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2857 else if (decimals < scale) {
2860 result = result * 10 + value;
2872 while (decimals < scale) {
2881 static void md_safemode_timeout(unsigned long data);
2884 safe_delay_show(mddev_t *mddev, char *page)
2886 int msec = (mddev->safemode_delay*1000)/HZ;
2887 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2890 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2894 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2897 mddev->safemode_delay = 0;
2899 unsigned long old_delay = mddev->safemode_delay;
2900 mddev->safemode_delay = (msec*HZ)/1000;
2901 if (mddev->safemode_delay == 0)
2902 mddev->safemode_delay = 1;
2903 if (mddev->safemode_delay < old_delay)
2904 md_safemode_timeout((unsigned long)mddev);
2908 static struct md_sysfs_entry md_safe_delay =
2909 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2912 level_show(mddev_t *mddev, char *page)
2914 struct mdk_personality *p = mddev->pers;
2916 return sprintf(page, "%s\n", p->name);
2917 else if (mddev->clevel[0])
2918 return sprintf(page, "%s\n", mddev->clevel);
2919 else if (mddev->level != LEVEL_NONE)
2920 return sprintf(page, "%d\n", mddev->level);
2926 level_store(mddev_t *mddev, const char *buf, size_t len)
2930 struct mdk_personality *pers;
2935 if (mddev->pers == NULL) {
2938 if (len >= sizeof(mddev->clevel))
2940 strncpy(mddev->clevel, buf, len);
2941 if (mddev->clevel[len-1] == '\n')
2943 mddev->clevel[len] = 0;
2944 mddev->level = LEVEL_NONE;
2948 /* request to change the personality. Need to ensure:
2949 * - array is not engaged in resync/recovery/reshape
2950 * - old personality can be suspended
2951 * - new personality will access other array.
2954 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2957 if (!mddev->pers->quiesce) {
2958 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2959 mdname(mddev), mddev->pers->name);
2963 /* Now find the new personality */
2964 if (len == 0 || len >= sizeof(clevel))
2966 strncpy(clevel, buf, len);
2967 if (clevel[len-1] == '\n')
2970 if (strict_strtol(clevel, 10, &level))
2973 if (request_module("md-%s", clevel) != 0)
2974 request_module("md-level-%s", clevel);
2975 spin_lock(&pers_lock);
2976 pers = find_pers(level, clevel);
2977 if (!pers || !try_module_get(pers->owner)) {
2978 spin_unlock(&pers_lock);
2979 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
2982 spin_unlock(&pers_lock);
2984 if (pers == mddev->pers) {
2985 /* Nothing to do! */
2986 module_put(pers->owner);
2989 if (!pers->takeover) {
2990 module_put(pers->owner);
2991 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2992 mdname(mddev), clevel);
2996 /* ->takeover must set new_* and/or delta_disks
2997 * if it succeeds, and may set them when it fails.
2999 priv = pers->takeover(mddev);
3001 mddev->new_level = mddev->level;
3002 mddev->new_layout = mddev->layout;
3003 mddev->new_chunk_sectors = mddev->chunk_sectors;
3004 mddev->raid_disks -= mddev->delta_disks;
3005 mddev->delta_disks = 0;
3006 module_put(pers->owner);
3007 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3008 mdname(mddev), clevel);
3009 return PTR_ERR(priv);
3012 /* Looks like we have a winner */
3013 mddev_suspend(mddev);
3014 mddev->pers->stop(mddev);
3016 if (mddev->pers->sync_request == NULL &&
3017 pers->sync_request != NULL) {
3018 /* need to add the md_redundancy_group */
3019 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3021 "md: cannot register extra attributes for %s\n",
3023 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3025 if (mddev->pers->sync_request != NULL &&
3026 pers->sync_request == NULL) {
3027 /* need to remove the md_redundancy_group */
3028 if (mddev->to_remove == NULL)
3029 mddev->to_remove = &md_redundancy_group;
3032 if (mddev->pers->sync_request == NULL &&
3034 /* We are converting from a no-redundancy array
3035 * to a redundancy array and metadata is managed
3036 * externally so we need to be sure that writes
3037 * won't block due to a need to transition
3039 * until external management is started.
3042 mddev->safemode_delay = 0;
3043 mddev->safemode = 0;
3046 module_put(mddev->pers->owner);
3047 /* Invalidate devices that are now superfluous */
3048 list_for_each_entry(rdev, &mddev->disks, same_set)
3049 if (rdev->raid_disk >= mddev->raid_disks) {
3050 rdev->raid_disk = -1;
3051 clear_bit(In_sync, &rdev->flags);
3054 mddev->private = priv;
3055 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3056 mddev->level = mddev->new_level;
3057 mddev->layout = mddev->new_layout;
3058 mddev->chunk_sectors = mddev->new_chunk_sectors;
3059 mddev->delta_disks = 0;
3060 if (mddev->pers->sync_request == NULL) {
3061 /* this is now an array without redundancy, so
3062 * it must always be in_sync
3065 del_timer_sync(&mddev->safemode_timer);
3068 mddev_resume(mddev);
3069 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3070 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3071 md_wakeup_thread(mddev->thread);
3072 sysfs_notify(&mddev->kobj, NULL, "level");
3073 md_new_event(mddev);
3077 static struct md_sysfs_entry md_level =
3078 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3082 layout_show(mddev_t *mddev, char *page)
3084 /* just a number, not meaningful for all levels */
3085 if (mddev->reshape_position != MaxSector &&
3086 mddev->layout != mddev->new_layout)
3087 return sprintf(page, "%d (%d)\n",
3088 mddev->new_layout, mddev->layout);
3089 return sprintf(page, "%d\n", mddev->layout);
3093 layout_store(mddev_t *mddev, const char *buf, size_t len)
3096 unsigned long n = simple_strtoul(buf, &e, 10);
3098 if (!*buf || (*e && *e != '\n'))
3103 if (mddev->pers->check_reshape == NULL)
3105 mddev->new_layout = n;
3106 err = mddev->pers->check_reshape(mddev);
3108 mddev->new_layout = mddev->layout;
3112 mddev->new_layout = n;
3113 if (mddev->reshape_position == MaxSector)
3118 static struct md_sysfs_entry md_layout =
3119 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3123 raid_disks_show(mddev_t *mddev, char *page)
3125 if (mddev->raid_disks == 0)
3127 if (mddev->reshape_position != MaxSector &&
3128 mddev->delta_disks != 0)
3129 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3130 mddev->raid_disks - mddev->delta_disks);
3131 return sprintf(page, "%d\n", mddev->raid_disks);
3134 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3137 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3141 unsigned long n = simple_strtoul(buf, &e, 10);
3143 if (!*buf || (*e && *e != '\n'))
3147 rv = update_raid_disks(mddev, n);
3148 else if (mddev->reshape_position != MaxSector) {
3149 int olddisks = mddev->raid_disks - mddev->delta_disks;
3150 mddev->delta_disks = n - olddisks;
3151 mddev->raid_disks = n;
3153 mddev->raid_disks = n;
3154 return rv ? rv : len;
3156 static struct md_sysfs_entry md_raid_disks =
3157 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3160 chunk_size_show(mddev_t *mddev, char *page)
3162 if (mddev->reshape_position != MaxSector &&
3163 mddev->chunk_sectors != mddev->new_chunk_sectors)
3164 return sprintf(page, "%d (%d)\n",
3165 mddev->new_chunk_sectors << 9,
3166 mddev->chunk_sectors << 9);
3167 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3171 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3174 unsigned long n = simple_strtoul(buf, &e, 10);
3176 if (!*buf || (*e && *e != '\n'))
3181 if (mddev->pers->check_reshape == NULL)
3183 mddev->new_chunk_sectors = n >> 9;
3184 err = mddev->pers->check_reshape(mddev);
3186 mddev->new_chunk_sectors = mddev->chunk_sectors;
3190 mddev->new_chunk_sectors = n >> 9;
3191 if (mddev->reshape_position == MaxSector)
3192 mddev->chunk_sectors = n >> 9;
3196 static struct md_sysfs_entry md_chunk_size =
3197 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3200 resync_start_show(mddev_t *mddev, char *page)
3202 if (mddev->recovery_cp == MaxSector)
3203 return sprintf(page, "none\n");
3204 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3208 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3211 unsigned long long n = simple_strtoull(buf, &e, 10);
3215 if (cmd_match(buf, "none"))
3217 else if (!*buf || (*e && *e != '\n'))
3220 mddev->recovery_cp = n;
3223 static struct md_sysfs_entry md_resync_start =
3224 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3227 * The array state can be:
3230 * No devices, no size, no level
3231 * Equivalent to STOP_ARRAY ioctl
3233 * May have some settings, but array is not active
3234 * all IO results in error
3235 * When written, doesn't tear down array, but just stops it
3236 * suspended (not supported yet)
3237 * All IO requests will block. The array can be reconfigured.
3238 * Writing this, if accepted, will block until array is quiescent
3240 * no resync can happen. no superblocks get written.
3241 * write requests fail
3243 * like readonly, but behaves like 'clean' on a write request.
3245 * clean - no pending writes, but otherwise active.
3246 * When written to inactive array, starts without resync
3247 * If a write request arrives then
3248 * if metadata is known, mark 'dirty' and switch to 'active'.
3249 * if not known, block and switch to write-pending
3250 * If written to an active array that has pending writes, then fails.
3252 * fully active: IO and resync can be happening.
3253 * When written to inactive array, starts with resync
3256 * clean, but writes are blocked waiting for 'active' to be written.
3259 * like active, but no writes have been seen for a while (100msec).
3262 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3263 write_pending, active_idle, bad_word};
3264 static char *array_states[] = {
3265 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3266 "write-pending", "active-idle", NULL };
3268 static int match_word(const char *word, char **list)
3271 for (n=0; list[n]; n++)
3272 if (cmd_match(word, list[n]))
3278 array_state_show(mddev_t *mddev, char *page)
3280 enum array_state st = inactive;
3293 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3295 else if (mddev->safemode)
3301 if (list_empty(&mddev->disks) &&
3302 mddev->raid_disks == 0 &&
3303 mddev->dev_sectors == 0)
3308 return sprintf(page, "%s\n", array_states[st]);
3311 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3312 static int md_set_readonly(mddev_t * mddev, int is_open);
3313 static int do_md_run(mddev_t * mddev);
3314 static int restart_array(mddev_t *mddev);
3317 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3320 enum array_state st = match_word(buf, array_states);
3325 /* stopping an active array */
3326 if (atomic_read(&mddev->openers) > 0)
3328 err = do_md_stop(mddev, 0, 0);
3331 /* stopping an active array */
3333 if (atomic_read(&mddev->openers) > 0)
3335 err = do_md_stop(mddev, 2, 0);
3337 err = 0; /* already inactive */
3340 break; /* not supported yet */
3343 err = md_set_readonly(mddev, 0);
3346 set_disk_ro(mddev->gendisk, 1);
3347 err = do_md_run(mddev);
3353 err = md_set_readonly(mddev, 0);
3354 else if (mddev->ro == 1)
3355 err = restart_array(mddev);
3358 set_disk_ro(mddev->gendisk, 0);
3362 err = do_md_run(mddev);
3367 restart_array(mddev);
3368 spin_lock_irq(&mddev->write_lock);
3369 if (atomic_read(&mddev->writes_pending) == 0) {
3370 if (mddev->in_sync == 0) {
3372 if (mddev->safemode == 1)
3373 mddev->safemode = 0;
3374 if (mddev->persistent)
3375 set_bit(MD_CHANGE_CLEAN,
3381 spin_unlock_irq(&mddev->write_lock);
3387 restart_array(mddev);
3388 if (mddev->external)
3389 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3390 wake_up(&mddev->sb_wait);
3394 set_disk_ro(mddev->gendisk, 0);
3395 err = do_md_run(mddev);
3400 /* these cannot be set */
3406 sysfs_notify_dirent(mddev->sysfs_state);
3410 static struct md_sysfs_entry md_array_state =
3411 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3414 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3415 return sprintf(page, "%d\n",
3416 atomic_read(&mddev->max_corr_read_errors));
3420 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3423 unsigned long n = simple_strtoul(buf, &e, 10);
3425 if (*buf && (*e == 0 || *e == '\n')) {
3426 atomic_set(&mddev->max_corr_read_errors, n);
3432 static struct md_sysfs_entry max_corr_read_errors =
3433 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3434 max_corrected_read_errors_store);
3437 null_show(mddev_t *mddev, char *page)
3443 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3445 /* buf must be %d:%d\n? giving major and minor numbers */
3446 /* The new device is added to the array.
3447 * If the array has a persistent superblock, we read the
3448 * superblock to initialise info and check validity.
3449 * Otherwise, only checking done is that in bind_rdev_to_array,
3450 * which mainly checks size.
3453 int major = simple_strtoul(buf, &e, 10);
3459 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3461 minor = simple_strtoul(e+1, &e, 10);
3462 if (*e && *e != '\n')
3464 dev = MKDEV(major, minor);
3465 if (major != MAJOR(dev) ||
3466 minor != MINOR(dev))
3470 if (mddev->persistent) {
3471 rdev = md_import_device(dev, mddev->major_version,
3472 mddev->minor_version);
3473 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3474 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3475 mdk_rdev_t, same_set);
3476 err = super_types[mddev->major_version]
3477 .load_super(rdev, rdev0, mddev->minor_version);
3481 } else if (mddev->external)
3482 rdev = md_import_device(dev, -2, -1);
3484 rdev = md_import_device(dev, -1, -1);
3487 return PTR_ERR(rdev);
3488 err = bind_rdev_to_array(rdev, mddev);
3492 return err ? err : len;
3495 static struct md_sysfs_entry md_new_device =
3496 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3499 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3502 unsigned long chunk, end_chunk;
3506 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3508 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3509 if (buf == end) break;
3510 if (*end == '-') { /* range */
3512 end_chunk = simple_strtoul(buf, &end, 0);
3513 if (buf == end) break;
3515 if (*end && !isspace(*end)) break;
3516 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3517 buf = skip_spaces(end);
3519 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3524 static struct md_sysfs_entry md_bitmap =
3525 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3528 size_show(mddev_t *mddev, char *page)
3530 return sprintf(page, "%llu\n",
3531 (unsigned long long)mddev->dev_sectors / 2);
3534 static int update_size(mddev_t *mddev, sector_t num_sectors);
3537 size_store(mddev_t *mddev, const char *buf, size_t len)
3539 /* If array is inactive, we can reduce the component size, but
3540 * not increase it (except from 0).
3541 * If array is active, we can try an on-line resize
3544 int err = strict_blocks_to_sectors(buf, §ors);
3549 err = update_size(mddev, sectors);
3550 md_update_sb(mddev, 1);
3552 if (mddev->dev_sectors == 0 ||
3553 mddev->dev_sectors > sectors)
3554 mddev->dev_sectors = sectors;
3558 return err ? err : len;
3561 static struct md_sysfs_entry md_size =
3562 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3567 * 'none' for arrays with no metadata (good luck...)
3568 * 'external' for arrays with externally managed metadata,
3569 * or N.M for internally known formats
3572 metadata_show(mddev_t *mddev, char *page)
3574 if (mddev->persistent)
3575 return sprintf(page, "%d.%d\n",
3576 mddev->major_version, mddev->minor_version);
3577 else if (mddev->external)
3578 return sprintf(page, "external:%s\n", mddev->metadata_type);
3580 return sprintf(page, "none\n");
3584 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3588 /* Changing the details of 'external' metadata is
3589 * always permitted. Otherwise there must be
3590 * no devices attached to the array.
3592 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3594 else if (!list_empty(&mddev->disks))
3597 if (cmd_match(buf, "none")) {
3598 mddev->persistent = 0;
3599 mddev->external = 0;
3600 mddev->major_version = 0;
3601 mddev->minor_version = 90;
3604 if (strncmp(buf, "external:", 9) == 0) {
3605 size_t namelen = len-9;
3606 if (namelen >= sizeof(mddev->metadata_type))
3607 namelen = sizeof(mddev->metadata_type)-1;
3608 strncpy(mddev->metadata_type, buf+9, namelen);
3609 mddev->metadata_type[namelen] = 0;
3610 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3611 mddev->metadata_type[--namelen] = 0;
3612 mddev->persistent = 0;
3613 mddev->external = 1;
3614 mddev->major_version = 0;
3615 mddev->minor_version = 90;
3618 major = simple_strtoul(buf, &e, 10);
3619 if (e==buf || *e != '.')
3622 minor = simple_strtoul(buf, &e, 10);
3623 if (e==buf || (*e && *e != '\n') )
3625 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3627 mddev->major_version = major;
3628 mddev->minor_version = minor;
3629 mddev->persistent = 1;
3630 mddev->external = 0;
3634 static struct md_sysfs_entry md_metadata =
3635 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3638 action_show(mddev_t *mddev, char *page)
3640 char *type = "idle";
3641 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3643 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3644 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3645 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3647 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3648 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3650 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3654 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3657 return sprintf(page, "%s\n", type);
3661 action_store(mddev_t *mddev, const char *page, size_t len)
3663 if (!mddev->pers || !mddev->pers->sync_request)
3666 if (cmd_match(page, "frozen"))
3667 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3669 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3671 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3672 if (mddev->sync_thread) {
3673 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3674 md_unregister_thread(mddev->sync_thread);
3675 mddev->sync_thread = NULL;
3676 mddev->recovery = 0;
3678 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3679 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3681 else if (cmd_match(page, "resync"))
3682 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3683 else if (cmd_match(page, "recover")) {
3684 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3685 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3686 } else if (cmd_match(page, "reshape")) {
3688 if (mddev->pers->start_reshape == NULL)
3690 err = mddev->pers->start_reshape(mddev);
3693 sysfs_notify(&mddev->kobj, NULL, "degraded");
3695 if (cmd_match(page, "check"))
3696 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3697 else if (!cmd_match(page, "repair"))
3699 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3700 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3702 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3703 md_wakeup_thread(mddev->thread);
3704 sysfs_notify_dirent(mddev->sysfs_action);
3709 mismatch_cnt_show(mddev_t *mddev, char *page)
3711 return sprintf(page, "%llu\n",
3712 (unsigned long long) mddev->resync_mismatches);
3715 static struct md_sysfs_entry md_scan_mode =
3716 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3719 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3722 sync_min_show(mddev_t *mddev, char *page)
3724 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3725 mddev->sync_speed_min ? "local": "system");
3729 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3733 if (strncmp(buf, "system", 6)==0) {
3734 mddev->sync_speed_min = 0;
3737 min = simple_strtoul(buf, &e, 10);
3738 if (buf == e || (*e && *e != '\n') || min <= 0)
3740 mddev->sync_speed_min = min;
3744 static struct md_sysfs_entry md_sync_min =
3745 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3748 sync_max_show(mddev_t *mddev, char *page)
3750 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3751 mddev->sync_speed_max ? "local": "system");
3755 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3759 if (strncmp(buf, "system", 6)==0) {
3760 mddev->sync_speed_max = 0;
3763 max = simple_strtoul(buf, &e, 10);
3764 if (buf == e || (*e && *e != '\n') || max <= 0)
3766 mddev->sync_speed_max = max;
3770 static struct md_sysfs_entry md_sync_max =
3771 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3774 degraded_show(mddev_t *mddev, char *page)
3776 return sprintf(page, "%d\n", mddev->degraded);
3778 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3781 sync_force_parallel_show(mddev_t *mddev, char *page)
3783 return sprintf(page, "%d\n", mddev->parallel_resync);
3787 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3791 if (strict_strtol(buf, 10, &n))
3794 if (n != 0 && n != 1)
3797 mddev->parallel_resync = n;
3799 if (mddev->sync_thread)
3800 wake_up(&resync_wait);
3805 /* force parallel resync, even with shared block devices */
3806 static struct md_sysfs_entry md_sync_force_parallel =
3807 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3808 sync_force_parallel_show, sync_force_parallel_store);
3811 sync_speed_show(mddev_t *mddev, char *page)
3813 unsigned long resync, dt, db;
3814 if (mddev->curr_resync == 0)
3815 return sprintf(page, "none\n");
3816 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3817 dt = (jiffies - mddev->resync_mark) / HZ;
3819 db = resync - mddev->resync_mark_cnt;
3820 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3823 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3826 sync_completed_show(mddev_t *mddev, char *page)
3828 unsigned long max_sectors, resync;
3830 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3831 return sprintf(page, "none\n");
3833 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3834 max_sectors = mddev->resync_max_sectors;
3836 max_sectors = mddev->dev_sectors;
3838 resync = mddev->curr_resync_completed;
3839 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3842 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3845 min_sync_show(mddev_t *mddev, char *page)
3847 return sprintf(page, "%llu\n",
3848 (unsigned long long)mddev->resync_min);
3851 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3853 unsigned long long min;
3854 if (strict_strtoull(buf, 10, &min))
3856 if (min > mddev->resync_max)
3858 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3861 /* Must be a multiple of chunk_size */
3862 if (mddev->chunk_sectors) {
3863 sector_t temp = min;
3864 if (sector_div(temp, mddev->chunk_sectors))
3867 mddev->resync_min = min;
3872 static struct md_sysfs_entry md_min_sync =
3873 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3876 max_sync_show(mddev_t *mddev, char *page)
3878 if (mddev->resync_max == MaxSector)
3879 return sprintf(page, "max\n");
3881 return sprintf(page, "%llu\n",
3882 (unsigned long long)mddev->resync_max);
3885 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3887 if (strncmp(buf, "max", 3) == 0)
3888 mddev->resync_max = MaxSector;
3890 unsigned long long max;
3891 if (strict_strtoull(buf, 10, &max))
3893 if (max < mddev->resync_min)
3895 if (max < mddev->resync_max &&
3897 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3900 /* Must be a multiple of chunk_size */
3901 if (mddev->chunk_sectors) {
3902 sector_t temp = max;
3903 if (sector_div(temp, mddev->chunk_sectors))
3906 mddev->resync_max = max;
3908 wake_up(&mddev->recovery_wait);
3912 static struct md_sysfs_entry md_max_sync =
3913 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3916 suspend_lo_show(mddev_t *mddev, char *page)
3918 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3922 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3925 unsigned long long new = simple_strtoull(buf, &e, 10);
3927 if (mddev->pers == NULL ||
3928 mddev->pers->quiesce == NULL)
3930 if (buf == e || (*e && *e != '\n'))
3932 if (new >= mddev->suspend_hi ||
3933 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3934 mddev->suspend_lo = new;
3935 mddev->pers->quiesce(mddev, 2);
3940 static struct md_sysfs_entry md_suspend_lo =
3941 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3945 suspend_hi_show(mddev_t *mddev, char *page)
3947 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3951 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3954 unsigned long long new = simple_strtoull(buf, &e, 10);
3956 if (mddev->pers == NULL ||
3957 mddev->pers->quiesce == NULL)
3959 if (buf == e || (*e && *e != '\n'))
3961 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3962 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3963 mddev->suspend_hi = new;
3964 mddev->pers->quiesce(mddev, 1);
3965 mddev->pers->quiesce(mddev, 0);
3970 static struct md_sysfs_entry md_suspend_hi =
3971 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3974 reshape_position_show(mddev_t *mddev, char *page)
3976 if (mddev->reshape_position != MaxSector)
3977 return sprintf(page, "%llu\n",
3978 (unsigned long long)mddev->reshape_position);
3979 strcpy(page, "none\n");
3984 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3987 unsigned long long new = simple_strtoull(buf, &e, 10);
3990 if (buf == e || (*e && *e != '\n'))
3992 mddev->reshape_position = new;
3993 mddev->delta_disks = 0;
3994 mddev->new_level = mddev->level;
3995 mddev->new_layout = mddev->layout;
3996 mddev->new_chunk_sectors = mddev->chunk_sectors;
4000 static struct md_sysfs_entry md_reshape_position =
4001 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4002 reshape_position_store);
4005 array_size_show(mddev_t *mddev, char *page)
4007 if (mddev->external_size)
4008 return sprintf(page, "%llu\n",
4009 (unsigned long long)mddev->array_sectors/2);
4011 return sprintf(page, "default\n");
4015 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4019 if (strncmp(buf, "default", 7) == 0) {
4021 sectors = mddev->pers->size(mddev, 0, 0);
4023 sectors = mddev->array_sectors;
4025 mddev->external_size = 0;
4027 if (strict_blocks_to_sectors(buf, §ors) < 0)
4029 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4032 mddev->external_size = 1;
4035 mddev->array_sectors = sectors;
4036 set_capacity(mddev->gendisk, mddev->array_sectors);
4038 revalidate_disk(mddev->gendisk);
4043 static struct md_sysfs_entry md_array_size =
4044 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4047 static struct attribute *md_default_attrs[] = {
4050 &md_raid_disks.attr,
4051 &md_chunk_size.attr,
4053 &md_resync_start.attr,
4055 &md_new_device.attr,
4056 &md_safe_delay.attr,
4057 &md_array_state.attr,
4058 &md_reshape_position.attr,
4059 &md_array_size.attr,
4060 &max_corr_read_errors.attr,
4064 static struct attribute *md_redundancy_attrs[] = {
4066 &md_mismatches.attr,
4069 &md_sync_speed.attr,
4070 &md_sync_force_parallel.attr,
4071 &md_sync_completed.attr,
4074 &md_suspend_lo.attr,
4075 &md_suspend_hi.attr,
4080 static struct attribute_group md_redundancy_group = {
4082 .attrs = md_redundancy_attrs,
4087 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4089 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4090 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4095 rv = mddev_lock(mddev);
4097 rv = entry->show(mddev, page);
4098 mddev_unlock(mddev);
4104 md_attr_store(struct kobject *kobj, struct attribute *attr,
4105 const char *page, size_t length)
4107 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4108 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4113 if (!capable(CAP_SYS_ADMIN))
4115 rv = mddev_lock(mddev);
4116 if (mddev->hold_active == UNTIL_IOCTL)
4117 mddev->hold_active = 0;
4119 rv = entry->store(mddev, page, length);
4120 mddev_unlock(mddev);
4125 static void md_free(struct kobject *ko)
4127 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4129 if (mddev->sysfs_state)
4130 sysfs_put(mddev->sysfs_state);
4132 if (mddev->gendisk) {
4133 del_gendisk(mddev->gendisk);
4134 put_disk(mddev->gendisk);
4137 blk_cleanup_queue(mddev->queue);
4142 static struct sysfs_ops md_sysfs_ops = {
4143 .show = md_attr_show,
4144 .store = md_attr_store,
4146 static struct kobj_type md_ktype = {
4148 .sysfs_ops = &md_sysfs_ops,
4149 .default_attrs = md_default_attrs,
4154 static void mddev_delayed_delete(struct work_struct *ws)
4156 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4158 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4159 kobject_del(&mddev->kobj);
4160 kobject_put(&mddev->kobj);
4163 static int md_alloc(dev_t dev, char *name)
4165 static DEFINE_MUTEX(disks_mutex);
4166 mddev_t *mddev = mddev_find(dev);
4167 struct gendisk *disk;
4176 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4177 shift = partitioned ? MdpMinorShift : 0;
4178 unit = MINOR(mddev->unit) >> shift;
4180 /* wait for any previous instance if this device
4181 * to be completed removed (mddev_delayed_delete).
4183 flush_scheduled_work();
4185 mutex_lock(&disks_mutex);
4191 /* Need to ensure that 'name' is not a duplicate.
4194 spin_lock(&all_mddevs_lock);
4196 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4197 if (mddev2->gendisk &&
4198 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4199 spin_unlock(&all_mddevs_lock);
4202 spin_unlock(&all_mddevs_lock);
4206 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4209 mddev->queue->queuedata = mddev;
4211 /* Can be unlocked because the queue is new: no concurrency */
4212 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4214 blk_queue_make_request(mddev->queue, md_make_request);
4216 disk = alloc_disk(1 << shift);
4218 blk_cleanup_queue(mddev->queue);
4219 mddev->queue = NULL;
4222 disk->major = MAJOR(mddev->unit);
4223 disk->first_minor = unit << shift;
4225 strcpy(disk->disk_name, name);
4226 else if (partitioned)
4227 sprintf(disk->disk_name, "md_d%d", unit);
4229 sprintf(disk->disk_name, "md%d", unit);
4230 disk->fops = &md_fops;
4231 disk->private_data = mddev;
4232 disk->queue = mddev->queue;
4233 /* Allow extended partitions. This makes the
4234 * 'mdp' device redundant, but we can't really
4237 disk->flags |= GENHD_FL_EXT_DEVT;
4239 mddev->gendisk = disk;
4240 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4241 &disk_to_dev(disk)->kobj, "%s", "md");
4243 /* This isn't possible, but as kobject_init_and_add is marked
4244 * __must_check, we must do something with the result
4246 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4250 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4251 printk(KERN_DEBUG "pointless warning\n");
4253 mutex_unlock(&disks_mutex);
4255 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4256 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4262 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4264 md_alloc(dev, NULL);
4268 static int add_named_array(const char *val, struct kernel_param *kp)
4270 /* val must be "md_*" where * is not all digits.
4271 * We allocate an array with a large free minor number, and
4272 * set the name to val. val must not already be an active name.
4274 int len = strlen(val);
4275 char buf[DISK_NAME_LEN];
4277 while (len && val[len-1] == '\n')
4279 if (len >= DISK_NAME_LEN)
4281 strlcpy(buf, val, len+1);
4282 if (strncmp(buf, "md_", 3) != 0)
4284 return md_alloc(0, buf);
4287 static void md_safemode_timeout(unsigned long data)
4289 mddev_t *mddev = (mddev_t *) data;
4291 if (!atomic_read(&mddev->writes_pending)) {
4292 mddev->safemode = 1;
4293 if (mddev->external)
4294 sysfs_notify_dirent(mddev->sysfs_state);
4296 md_wakeup_thread(mddev->thread);
4299 static int start_dirty_degraded;
4301 static int md_run(mddev_t *mddev)
4305 struct mdk_personality *pers;
4307 if (list_empty(&mddev->disks))
4308 /* cannot run an array with no devices.. */
4314 /* These two calls synchronise us with the
4315 * sysfs_remove_group calls in mddev_unlock,
4316 * so they must have completed.
4318 mutex_lock(&mddev->open_mutex);
4319 mutex_unlock(&mddev->open_mutex);
4322 * Analyze all RAID superblock(s)
4324 if (!mddev->raid_disks) {
4325 if (!mddev->persistent)
4330 if (mddev->level != LEVEL_NONE)
4331 request_module("md-level-%d", mddev->level);
4332 else if (mddev->clevel[0])
4333 request_module("md-%s", mddev->clevel);
4336 * Drop all container device buffers, from now on
4337 * the only valid external interface is through the md
4340 list_for_each_entry(rdev, &mddev->disks, same_set) {
4341 if (test_bit(Faulty, &rdev->flags))
4343 sync_blockdev(rdev->bdev);
4344 invalidate_bdev(rdev->bdev);
4346 /* perform some consistency tests on the device.
4347 * We don't want the data to overlap the metadata,
4348 * Internal Bitmap issues have been handled elsewhere.
4350 if (rdev->data_offset < rdev->sb_start) {
4351 if (mddev->dev_sectors &&
4352 rdev->data_offset + mddev->dev_sectors
4354 printk("md: %s: data overlaps metadata\n",
4359 if (rdev->sb_start + rdev->sb_size/512
4360 > rdev->data_offset) {
4361 printk("md: %s: metadata overlaps data\n",
4366 sysfs_notify_dirent(rdev->sysfs_state);
4369 spin_lock(&pers_lock);
4370 pers = find_pers(mddev->level, mddev->clevel);
4371 if (!pers || !try_module_get(pers->owner)) {
4372 spin_unlock(&pers_lock);
4373 if (mddev->level != LEVEL_NONE)
4374 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4377 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4382 spin_unlock(&pers_lock);
4383 if (mddev->level != pers->level) {
4384 mddev->level = pers->level;
4385 mddev->new_level = pers->level;
4387 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4389 if (mddev->reshape_position != MaxSector &&
4390 pers->start_reshape == NULL) {
4391 /* This personality cannot handle reshaping... */
4393 module_put(pers->owner);
4397 if (pers->sync_request) {
4398 /* Warn if this is a potentially silly
4401 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4405 list_for_each_entry(rdev, &mddev->disks, same_set)
4406 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4408 rdev->bdev->bd_contains ==
4409 rdev2->bdev->bd_contains) {
4411 "%s: WARNING: %s appears to be"
4412 " on the same physical disk as"
4415 bdevname(rdev->bdev,b),
4416 bdevname(rdev2->bdev,b2));
4423 "True protection against single-disk"
4424 " failure might be compromised.\n");
4427 mddev->recovery = 0;
4428 /* may be over-ridden by personality */
4429 mddev->resync_max_sectors = mddev->dev_sectors;
4431 mddev->barriers_work = 1;
4432 mddev->ok_start_degraded = start_dirty_degraded;
4434 if (start_readonly && mddev->ro == 0)
4435 mddev->ro = 2; /* read-only, but switch on first write */
4437 err = mddev->pers->run(mddev);
4439 printk(KERN_ERR "md: pers->run() failed ...\n");
4440 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4441 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4442 " but 'external_size' not in effect?\n", __func__);
4444 "md: invalid array_size %llu > default size %llu\n",
4445 (unsigned long long)mddev->array_sectors / 2,
4446 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4448 mddev->pers->stop(mddev);
4450 if (err == 0 && mddev->pers->sync_request) {
4451 err = bitmap_create(mddev);
4453 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4454 mdname(mddev), err);
4455 mddev->pers->stop(mddev);
4459 module_put(mddev->pers->owner);
4461 bitmap_destroy(mddev);
4464 if (mddev->pers->sync_request) {
4465 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4467 "md: cannot register extra attributes for %s\n",
4469 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4470 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4473 atomic_set(&mddev->writes_pending,0);
4474 atomic_set(&mddev->max_corr_read_errors,
4475 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4476 mddev->safemode = 0;
4477 mddev->safemode_timer.function = md_safemode_timeout;
4478 mddev->safemode_timer.data = (unsigned long) mddev;
4479 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4482 list_for_each_entry(rdev, &mddev->disks, same_set)
4483 if (rdev->raid_disk >= 0) {
4485 sprintf(nm, "rd%d", rdev->raid_disk);
4486 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4487 printk("md: cannot register %s for %s\n",
4491 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4494 md_update_sb(mddev, 0);
4496 md_wakeup_thread(mddev->thread);
4497 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4499 md_new_event(mddev);
4500 sysfs_notify_dirent(mddev->sysfs_state);
4501 if (mddev->sysfs_action)
4502 sysfs_notify_dirent(mddev->sysfs_action);
4503 sysfs_notify(&mddev->kobj, NULL, "degraded");
4507 static int do_md_run(mddev_t *mddev)
4511 err = md_run(mddev);
4515 set_capacity(mddev->gendisk, mddev->array_sectors);
4516 revalidate_disk(mddev->gendisk);
4517 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4522 static int restart_array(mddev_t *mddev)
4524 struct gendisk *disk = mddev->gendisk;
4526 /* Complain if it has no devices */
4527 if (list_empty(&mddev->disks))
4533 mddev->safemode = 0;
4535 set_disk_ro(disk, 0);
4536 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4538 /* Kick recovery or resync if necessary */
4539 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4540 md_wakeup_thread(mddev->thread);
4541 md_wakeup_thread(mddev->sync_thread);
4542 sysfs_notify_dirent(mddev->sysfs_state);
4546 /* similar to deny_write_access, but accounts for our holding a reference
4547 * to the file ourselves */
4548 static int deny_bitmap_write_access(struct file * file)
4550 struct inode *inode = file->f_mapping->host;
4552 spin_lock(&inode->i_lock);
4553 if (atomic_read(&inode->i_writecount) > 1) {
4554 spin_unlock(&inode->i_lock);
4557 atomic_set(&inode->i_writecount, -1);
4558 spin_unlock(&inode->i_lock);
4563 void restore_bitmap_write_access(struct file *file)
4565 struct inode *inode = file->f_mapping->host;
4567 spin_lock(&inode->i_lock);
4568 atomic_set(&inode->i_writecount, 1);
4569 spin_unlock(&inode->i_lock);
4572 static void md_clean(mddev_t *mddev)
4574 mddev->array_sectors = 0;
4575 mddev->external_size = 0;
4576 mddev->dev_sectors = 0;
4577 mddev->raid_disks = 0;
4578 mddev->recovery_cp = 0;
4579 mddev->resync_min = 0;
4580 mddev->resync_max = MaxSector;
4581 mddev->reshape_position = MaxSector;
4582 mddev->external = 0;
4583 mddev->persistent = 0;
4584 mddev->level = LEVEL_NONE;
4585 mddev->clevel[0] = 0;
4588 mddev->metadata_type[0] = 0;
4589 mddev->chunk_sectors = 0;
4590 mddev->ctime = mddev->utime = 0;
4592 mddev->max_disks = 0;
4594 mddev->can_decrease_events = 0;
4595 mddev->delta_disks = 0;
4596 mddev->new_level = LEVEL_NONE;
4597 mddev->new_layout = 0;
4598 mddev->new_chunk_sectors = 0;
4599 mddev->curr_resync = 0;
4600 mddev->resync_mismatches = 0;
4601 mddev->suspend_lo = mddev->suspend_hi = 0;
4602 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4603 mddev->recovery = 0;
4605 mddev->degraded = 0;
4606 mddev->barriers_work = 0;
4607 mddev->safemode = 0;
4608 mddev->bitmap_info.offset = 0;
4609 mddev->bitmap_info.default_offset = 0;
4610 mddev->bitmap_info.chunksize = 0;
4611 mddev->bitmap_info.daemon_sleep = 0;
4612 mddev->bitmap_info.max_write_behind = 0;
4615 static void md_stop_writes(mddev_t *mddev)
4617 if (mddev->sync_thread) {
4618 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4619 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4620 md_unregister_thread(mddev->sync_thread);
4621 mddev->sync_thread = NULL;
4624 del_timer_sync(&mddev->safemode_timer);
4626 bitmap_flush(mddev);
4627 md_super_wait(mddev);
4629 if (!mddev->in_sync || mddev->flags) {
4630 /* mark array as shutdown cleanly */
4632 md_update_sb(mddev, 1);
4636 static void md_stop(mddev_t *mddev)
4638 md_stop_writes(mddev);
4640 mddev->pers->stop(mddev);
4641 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4642 mddev->to_remove = &md_redundancy_group;
4643 module_put(mddev->pers->owner);
4645 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4648 static int md_set_readonly(mddev_t *mddev, int is_open)
4651 mutex_lock(&mddev->open_mutex);
4652 if (atomic_read(&mddev->openers) > is_open) {
4653 printk("md: %s still in use.\n",mdname(mddev));
4658 md_stop_writes(mddev);
4664 set_disk_ro(mddev->gendisk, 1);
4665 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4666 sysfs_notify_dirent(mddev->sysfs_state);
4670 mutex_unlock(&mddev->open_mutex);
4675 * 0 - completely stop and dis-assemble array
4676 * 2 - stop but do not disassemble array
4678 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4681 struct gendisk *disk = mddev->gendisk;
4684 mutex_lock(&mddev->open_mutex);
4685 if (atomic_read(&mddev->openers) > is_open) {
4686 printk("md: %s still in use.\n",mdname(mddev));
4688 } else if (mddev->pers) {
4691 set_disk_ro(disk, 0);
4694 mddev->queue->merge_bvec_fn = NULL;
4695 mddev->queue->unplug_fn = NULL;
4696 mddev->queue->backing_dev_info.congested_fn = NULL;
4698 /* tell userspace to handle 'inactive' */
4699 sysfs_notify_dirent(mddev->sysfs_state);
4701 list_for_each_entry(rdev, &mddev->disks, same_set)
4702 if (rdev->raid_disk >= 0) {
4704 sprintf(nm, "rd%d", rdev->raid_disk);
4705 sysfs_remove_link(&mddev->kobj, nm);
4708 set_capacity(disk, 0);
4709 revalidate_disk(disk);
4716 mutex_unlock(&mddev->open_mutex);
4720 * Free resources if final stop
4724 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4726 bitmap_destroy(mddev);
4727 if (mddev->bitmap_info.file) {
4728 restore_bitmap_write_access(mddev->bitmap_info.file);
4729 fput(mddev->bitmap_info.file);
4730 mddev->bitmap_info.file = NULL;
4732 mddev->bitmap_info.offset = 0;
4734 export_array(mddev);
4737 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4738 if (mddev->hold_active == UNTIL_STOP)
4739 mddev->hold_active = 0;
4743 blk_integrity_unregister(disk);
4744 md_new_event(mddev);
4745 sysfs_notify_dirent(mddev->sysfs_state);
4750 static void autorun_array(mddev_t *mddev)
4755 if (list_empty(&mddev->disks))
4758 printk(KERN_INFO "md: running: ");
4760 list_for_each_entry(rdev, &mddev->disks, same_set) {
4761 char b[BDEVNAME_SIZE];
4762 printk("<%s>", bdevname(rdev->bdev,b));
4766 err = do_md_run(mddev);
4768 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4769 do_md_stop(mddev, 0, 0);
4774 * lets try to run arrays based on all disks that have arrived
4775 * until now. (those are in pending_raid_disks)
4777 * the method: pick the first pending disk, collect all disks with
4778 * the same UUID, remove all from the pending list and put them into
4779 * the 'same_array' list. Then order this list based on superblock
4780 * update time (freshest comes first), kick out 'old' disks and
4781 * compare superblocks. If everything's fine then run it.
4783 * If "unit" is allocated, then bump its reference count
4785 static void autorun_devices(int part)
4787 mdk_rdev_t *rdev0, *rdev, *tmp;
4789 char b[BDEVNAME_SIZE];
4791 printk(KERN_INFO "md: autorun ...\n");
4792 while (!list_empty(&pending_raid_disks)) {
4795 LIST_HEAD(candidates);
4796 rdev0 = list_entry(pending_raid_disks.next,
4797 mdk_rdev_t, same_set);
4799 printk(KERN_INFO "md: considering %s ...\n",
4800 bdevname(rdev0->bdev,b));
4801 INIT_LIST_HEAD(&candidates);
4802 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4803 if (super_90_load(rdev, rdev0, 0) >= 0) {
4804 printk(KERN_INFO "md: adding %s ...\n",
4805 bdevname(rdev->bdev,b));
4806 list_move(&rdev->same_set, &candidates);
4809 * now we have a set of devices, with all of them having
4810 * mostly sane superblocks. It's time to allocate the
4814 dev = MKDEV(mdp_major,
4815 rdev0->preferred_minor << MdpMinorShift);
4816 unit = MINOR(dev) >> MdpMinorShift;
4818 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4821 if (rdev0->preferred_minor != unit) {
4822 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4823 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4827 md_probe(dev, NULL, NULL);
4828 mddev = mddev_find(dev);
4829 if (!mddev || !mddev->gendisk) {
4833 "md: cannot allocate memory for md drive.\n");
4836 if (mddev_lock(mddev))
4837 printk(KERN_WARNING "md: %s locked, cannot run\n",
4839 else if (mddev->raid_disks || mddev->major_version
4840 || !list_empty(&mddev->disks)) {
4842 "md: %s already running, cannot run %s\n",
4843 mdname(mddev), bdevname(rdev0->bdev,b));
4844 mddev_unlock(mddev);
4846 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4847 mddev->persistent = 1;
4848 rdev_for_each_list(rdev, tmp, &candidates) {
4849 list_del_init(&rdev->same_set);
4850 if (bind_rdev_to_array(rdev, mddev))
4853 autorun_array(mddev);
4854 mddev_unlock(mddev);
4856 /* on success, candidates will be empty, on error
4859 rdev_for_each_list(rdev, tmp, &candidates) {
4860 list_del_init(&rdev->same_set);
4865 printk(KERN_INFO "md: ... autorun DONE.\n");
4867 #endif /* !MODULE */
4869 static int get_version(void __user * arg)
4873 ver.major = MD_MAJOR_VERSION;
4874 ver.minor = MD_MINOR_VERSION;
4875 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4877 if (copy_to_user(arg, &ver, sizeof(ver)))
4883 static int get_array_info(mddev_t * mddev, void __user * arg)
4885 mdu_array_info_t info;
4886 int nr,working,insync,failed,spare;
4889 nr=working=insync=failed=spare=0;
4890 list_for_each_entry(rdev, &mddev->disks, same_set) {
4892 if (test_bit(Faulty, &rdev->flags))
4896 if (test_bit(In_sync, &rdev->flags))
4903 info.major_version = mddev->major_version;
4904 info.minor_version = mddev->minor_version;
4905 info.patch_version = MD_PATCHLEVEL_VERSION;
4906 info.ctime = mddev->ctime;
4907 info.level = mddev->level;
4908 info.size = mddev->dev_sectors / 2;
4909 if (info.size != mddev->dev_sectors / 2) /* overflow */
4912 info.raid_disks = mddev->raid_disks;
4913 info.md_minor = mddev->md_minor;
4914 info.not_persistent= !mddev->persistent;
4916 info.utime = mddev->utime;
4919 info.state = (1<<MD_SB_CLEAN);
4920 if (mddev->bitmap && mddev->bitmap_info.offset)
4921 info.state = (1<<MD_SB_BITMAP_PRESENT);
4922 info.active_disks = insync;
4923 info.working_disks = working;
4924 info.failed_disks = failed;
4925 info.spare_disks = spare;
4927 info.layout = mddev->layout;
4928 info.chunk_size = mddev->chunk_sectors << 9;
4930 if (copy_to_user(arg, &info, sizeof(info)))
4936 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4938 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4939 char *ptr, *buf = NULL;
4942 if (md_allow_write(mddev))
4943 file = kmalloc(sizeof(*file), GFP_NOIO);
4945 file = kmalloc(sizeof(*file), GFP_KERNEL);
4950 /* bitmap disabled, zero the first byte and copy out */
4951 if (!mddev->bitmap || !mddev->bitmap->file) {
4952 file->pathname[0] = '\0';
4956 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4960 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4964 strcpy(file->pathname, ptr);
4968 if (copy_to_user(arg, file, sizeof(*file)))
4976 static int get_disk_info(mddev_t * mddev, void __user * arg)
4978 mdu_disk_info_t info;
4981 if (copy_from_user(&info, arg, sizeof(info)))
4984 rdev = find_rdev_nr(mddev, info.number);
4986 info.major = MAJOR(rdev->bdev->bd_dev);
4987 info.minor = MINOR(rdev->bdev->bd_dev);
4988 info.raid_disk = rdev->raid_disk;
4990 if (test_bit(Faulty, &rdev->flags))
4991 info.state |= (1<<MD_DISK_FAULTY);
4992 else if (test_bit(In_sync, &rdev->flags)) {
4993 info.state |= (1<<MD_DISK_ACTIVE);
4994 info.state |= (1<<MD_DISK_SYNC);
4996 if (test_bit(WriteMostly, &rdev->flags))
4997 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4999 info.major = info.minor = 0;
5000 info.raid_disk = -1;
5001 info.state = (1<<MD_DISK_REMOVED);
5004 if (copy_to_user(arg, &info, sizeof(info)))
5010 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5012 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5014 dev_t dev = MKDEV(info->major,info->minor);
5016 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5019 if (!mddev->raid_disks) {
5021 /* expecting a device which has a superblock */
5022 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5025 "md: md_import_device returned %ld\n",
5027 return PTR_ERR(rdev);
5029 if (!list_empty(&mddev->disks)) {
5030 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5031 mdk_rdev_t, same_set);
5032 err = super_types[mddev->major_version]
5033 .load_super(rdev, rdev0, mddev->minor_version);
5036 "md: %s has different UUID to %s\n",
5037 bdevname(rdev->bdev,b),
5038 bdevname(rdev0->bdev,b2));
5043 err = bind_rdev_to_array(rdev, mddev);
5050 * add_new_disk can be used once the array is assembled
5051 * to add "hot spares". They must already have a superblock
5056 if (!mddev->pers->hot_add_disk) {
5058 "%s: personality does not support diskops!\n",
5062 if (mddev->persistent)
5063 rdev = md_import_device(dev, mddev->major_version,
5064 mddev->minor_version);
5066 rdev = md_import_device(dev, -1, -1);
5069 "md: md_import_device returned %ld\n",
5071 return PTR_ERR(rdev);
5073 /* set save_raid_disk if appropriate */
5074 if (!mddev->persistent) {
5075 if (info->state & (1<<MD_DISK_SYNC) &&
5076 info->raid_disk < mddev->raid_disks)
5077 rdev->raid_disk = info->raid_disk;
5079 rdev->raid_disk = -1;
5081 super_types[mddev->major_version].
5082 validate_super(mddev, rdev);
5083 rdev->saved_raid_disk = rdev->raid_disk;
5085 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5086 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5087 set_bit(WriteMostly, &rdev->flags);
5089 clear_bit(WriteMostly, &rdev->flags);
5091 rdev->raid_disk = -1;
5092 err = bind_rdev_to_array(rdev, mddev);
5093 if (!err && !mddev->pers->hot_remove_disk) {
5094 /* If there is hot_add_disk but no hot_remove_disk
5095 * then added disks for geometry changes,
5096 * and should be added immediately.
5098 super_types[mddev->major_version].
5099 validate_super(mddev, rdev);
5100 err = mddev->pers->hot_add_disk(mddev, rdev);
5102 unbind_rdev_from_array(rdev);
5107 sysfs_notify_dirent(rdev->sysfs_state);
5109 md_update_sb(mddev, 1);
5110 if (mddev->degraded)
5111 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5112 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5113 md_wakeup_thread(mddev->thread);
5117 /* otherwise, add_new_disk is only allowed
5118 * for major_version==0 superblocks
5120 if (mddev->major_version != 0) {
5121 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5126 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5128 rdev = md_import_device(dev, -1, 0);
5131 "md: error, md_import_device() returned %ld\n",
5133 return PTR_ERR(rdev);
5135 rdev->desc_nr = info->number;
5136 if (info->raid_disk < mddev->raid_disks)
5137 rdev->raid_disk = info->raid_disk;
5139 rdev->raid_disk = -1;
5141 if (rdev->raid_disk < mddev->raid_disks)
5142 if (info->state & (1<<MD_DISK_SYNC))
5143 set_bit(In_sync, &rdev->flags);
5145 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5146 set_bit(WriteMostly, &rdev->flags);
5148 if (!mddev->persistent) {
5149 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5150 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5152 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5153 rdev->sectors = rdev->sb_start;
5155 err = bind_rdev_to_array(rdev, mddev);
5165 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5167 char b[BDEVNAME_SIZE];
5170 rdev = find_rdev(mddev, dev);
5174 if (rdev->raid_disk >= 0)
5177 kick_rdev_from_array(rdev);
5178 md_update_sb(mddev, 1);
5179 md_new_event(mddev);
5183 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5184 bdevname(rdev->bdev,b), mdname(mddev));
5188 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5190 char b[BDEVNAME_SIZE];
5197 if (mddev->major_version != 0) {
5198 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5199 " version-0 superblocks.\n",
5203 if (!mddev->pers->hot_add_disk) {
5205 "%s: personality does not support diskops!\n",
5210 rdev = md_import_device(dev, -1, 0);
5213 "md: error, md_import_device() returned %ld\n",
5218 if (mddev->persistent)
5219 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5221 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5223 rdev->sectors = rdev->sb_start;
5225 if (test_bit(Faulty, &rdev->flags)) {
5227 "md: can not hot-add faulty %s disk to %s!\n",
5228 bdevname(rdev->bdev,b), mdname(mddev));
5232 clear_bit(In_sync, &rdev->flags);
5234 rdev->saved_raid_disk = -1;
5235 err = bind_rdev_to_array(rdev, mddev);
5240 * The rest should better be atomic, we can have disk failures
5241 * noticed in interrupt contexts ...
5244 rdev->raid_disk = -1;
5246 md_update_sb(mddev, 1);
5249 * Kick recovery, maybe this spare has to be added to the
5250 * array immediately.
5252 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5253 md_wakeup_thread(mddev->thread);
5254 md_new_event(mddev);
5262 static int set_bitmap_file(mddev_t *mddev, int fd)
5267 if (!mddev->pers->quiesce)
5269 if (mddev->recovery || mddev->sync_thread)
5271 /* we should be able to change the bitmap.. */
5277 return -EEXIST; /* cannot add when bitmap is present */
5278 mddev->bitmap_info.file = fget(fd);
5280 if (mddev->bitmap_info.file == NULL) {
5281 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5286 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5288 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5290 fput(mddev->bitmap_info.file);
5291 mddev->bitmap_info.file = NULL;
5294 mddev->bitmap_info.offset = 0; /* file overrides offset */
5295 } else if (mddev->bitmap == NULL)
5296 return -ENOENT; /* cannot remove what isn't there */
5299 mddev->pers->quiesce(mddev, 1);
5301 err = bitmap_create(mddev);
5302 if (fd < 0 || err) {
5303 bitmap_destroy(mddev);
5304 fd = -1; /* make sure to put the file */
5306 mddev->pers->quiesce(mddev, 0);
5309 if (mddev->bitmap_info.file) {
5310 restore_bitmap_write_access(mddev->bitmap_info.file);
5311 fput(mddev->bitmap_info.file);
5313 mddev->bitmap_info.file = NULL;
5320 * set_array_info is used two different ways
5321 * The original usage is when creating a new array.
5322 * In this usage, raid_disks is > 0 and it together with
5323 * level, size, not_persistent,layout,chunksize determine the
5324 * shape of the array.
5325 * This will always create an array with a type-0.90.0 superblock.
5326 * The newer usage is when assembling an array.
5327 * In this case raid_disks will be 0, and the major_version field is
5328 * use to determine which style super-blocks are to be found on the devices.
5329 * The minor and patch _version numbers are also kept incase the
5330 * super_block handler wishes to interpret them.
5332 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5335 if (info->raid_disks == 0) {
5336 /* just setting version number for superblock loading */
5337 if (info->major_version < 0 ||
5338 info->major_version >= ARRAY_SIZE(super_types) ||
5339 super_types[info->major_version].name == NULL) {
5340 /* maybe try to auto-load a module? */
5342 "md: superblock version %d not known\n",
5343 info->major_version);
5346 mddev->major_version = info->major_version;
5347 mddev->minor_version = info->minor_version;
5348 mddev->patch_version = info->patch_version;
5349 mddev->persistent = !info->not_persistent;
5350 /* ensure mddev_put doesn't delete this now that there
5351 * is some minimal configuration.
5353 mddev->ctime = get_seconds();
5356 mddev->major_version = MD_MAJOR_VERSION;
5357 mddev->minor_version = MD_MINOR_VERSION;
5358 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5359 mddev->ctime = get_seconds();
5361 mddev->level = info->level;
5362 mddev->clevel[0] = 0;
5363 mddev->dev_sectors = 2 * (sector_t)info->size;
5364 mddev->raid_disks = info->raid_disks;
5365 /* don't set md_minor, it is determined by which /dev/md* was
5368 if (info->state & (1<<MD_SB_CLEAN))
5369 mddev->recovery_cp = MaxSector;
5371 mddev->recovery_cp = 0;
5372 mddev->persistent = ! info->not_persistent;
5373 mddev->external = 0;
5375 mddev->layout = info->layout;
5376 mddev->chunk_sectors = info->chunk_size >> 9;
5378 mddev->max_disks = MD_SB_DISKS;
5380 if (mddev->persistent)
5382 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5384 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5385 mddev->bitmap_info.offset = 0;
5387 mddev->reshape_position = MaxSector;
5390 * Generate a 128 bit UUID
5392 get_random_bytes(mddev->uuid, 16);
5394 mddev->new_level = mddev->level;
5395 mddev->new_chunk_sectors = mddev->chunk_sectors;
5396 mddev->new_layout = mddev->layout;
5397 mddev->delta_disks = 0;
5402 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5404 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5406 if (mddev->external_size)
5409 mddev->array_sectors = array_sectors;
5411 EXPORT_SYMBOL(md_set_array_sectors);
5413 static int update_size(mddev_t *mddev, sector_t num_sectors)
5417 int fit = (num_sectors == 0);
5419 if (mddev->pers->resize == NULL)
5421 /* The "num_sectors" is the number of sectors of each device that
5422 * is used. This can only make sense for arrays with redundancy.
5423 * linear and raid0 always use whatever space is available. We can only
5424 * consider changing this number if no resync or reconstruction is
5425 * happening, and if the new size is acceptable. It must fit before the
5426 * sb_start or, if that is <data_offset, it must fit before the size
5427 * of each device. If num_sectors is zero, we find the largest size
5431 if (mddev->sync_thread)
5434 /* Sorry, cannot grow a bitmap yet, just remove it,
5438 list_for_each_entry(rdev, &mddev->disks, same_set) {
5439 sector_t avail = rdev->sectors;
5441 if (fit && (num_sectors == 0 || num_sectors > avail))
5442 num_sectors = avail;
5443 if (avail < num_sectors)
5446 rv = mddev->pers->resize(mddev, num_sectors);
5448 revalidate_disk(mddev->gendisk);
5452 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5455 /* change the number of raid disks */
5456 if (mddev->pers->check_reshape == NULL)
5458 if (raid_disks <= 0 ||
5459 (mddev->max_disks && raid_disks >= mddev->max_disks))
5461 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5463 mddev->delta_disks = raid_disks - mddev->raid_disks;
5465 rv = mddev->pers->check_reshape(mddev);
5471 * update_array_info is used to change the configuration of an
5473 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5474 * fields in the info are checked against the array.
5475 * Any differences that cannot be handled will cause an error.
5476 * Normally, only one change can be managed at a time.
5478 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5484 /* calculate expected state,ignoring low bits */
5485 if (mddev->bitmap && mddev->bitmap_info.offset)
5486 state |= (1 << MD_SB_BITMAP_PRESENT);
5488 if (mddev->major_version != info->major_version ||
5489 mddev->minor_version != info->minor_version ||
5490 /* mddev->patch_version != info->patch_version || */
5491 mddev->ctime != info->ctime ||
5492 mddev->level != info->level ||
5493 /* mddev->layout != info->layout || */
5494 !mddev->persistent != info->not_persistent||
5495 mddev->chunk_sectors != info->chunk_size >> 9 ||
5496 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5497 ((state^info->state) & 0xfffffe00)
5500 /* Check there is only one change */
5501 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5503 if (mddev->raid_disks != info->raid_disks)
5505 if (mddev->layout != info->layout)
5507 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5514 if (mddev->layout != info->layout) {
5516 * we don't need to do anything at the md level, the
5517 * personality will take care of it all.
5519 if (mddev->pers->check_reshape == NULL)
5522 mddev->new_layout = info->layout;
5523 rv = mddev->pers->check_reshape(mddev);
5525 mddev->new_layout = mddev->layout;
5529 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5530 rv = update_size(mddev, (sector_t)info->size * 2);
5532 if (mddev->raid_disks != info->raid_disks)
5533 rv = update_raid_disks(mddev, info->raid_disks);
5535 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5536 if (mddev->pers->quiesce == NULL)
5538 if (mddev->recovery || mddev->sync_thread)
5540 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5541 /* add the bitmap */
5544 if (mddev->bitmap_info.default_offset == 0)
5546 mddev->bitmap_info.offset =
5547 mddev->bitmap_info.default_offset;
5548 mddev->pers->quiesce(mddev, 1);
5549 rv = bitmap_create(mddev);
5551 bitmap_destroy(mddev);
5552 mddev->pers->quiesce(mddev, 0);
5554 /* remove the bitmap */
5557 if (mddev->bitmap->file)
5559 mddev->pers->quiesce(mddev, 1);
5560 bitmap_destroy(mddev);
5561 mddev->pers->quiesce(mddev, 0);
5562 mddev->bitmap_info.offset = 0;
5565 md_update_sb(mddev, 1);
5569 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5573 if (mddev->pers == NULL)
5576 rdev = find_rdev(mddev, dev);
5580 md_error(mddev, rdev);
5585 * We have a problem here : there is no easy way to give a CHS
5586 * virtual geometry. We currently pretend that we have a 2 heads
5587 * 4 sectors (with a BIG number of cylinders...). This drives
5588 * dosfs just mad... ;-)
5590 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5592 mddev_t *mddev = bdev->bd_disk->private_data;
5596 geo->cylinders = mddev->array_sectors / 8;
5600 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5601 unsigned int cmd, unsigned long arg)
5604 void __user *argp = (void __user *)arg;
5605 mddev_t *mddev = NULL;
5608 if (!capable(CAP_SYS_ADMIN))
5612 * Commands dealing with the RAID driver but not any
5618 err = get_version(argp);
5621 case PRINT_RAID_DEBUG:
5629 autostart_arrays(arg);
5636 * Commands creating/starting a new array:
5639 mddev = bdev->bd_disk->private_data;
5646 err = mddev_lock(mddev);
5649 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5656 case SET_ARRAY_INFO:
5658 mdu_array_info_t info;
5660 memset(&info, 0, sizeof(info));
5661 else if (copy_from_user(&info, argp, sizeof(info))) {
5666 err = update_array_info(mddev, &info);
5668 printk(KERN_WARNING "md: couldn't update"
5669 " array info. %d\n", err);
5674 if (!list_empty(&mddev->disks)) {
5676 "md: array %s already has disks!\n",
5681 if (mddev->raid_disks) {
5683 "md: array %s already initialised!\n",
5688 err = set_array_info(mddev, &info);
5690 printk(KERN_WARNING "md: couldn't set"
5691 " array info. %d\n", err);
5701 * Commands querying/configuring an existing array:
5703 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5704 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5705 if ((!mddev->raid_disks && !mddev->external)
5706 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5707 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5708 && cmd != GET_BITMAP_FILE) {
5714 * Commands even a read-only array can execute:
5718 case GET_ARRAY_INFO:
5719 err = get_array_info(mddev, argp);
5722 case GET_BITMAP_FILE:
5723 err = get_bitmap_file(mddev, argp);
5727 err = get_disk_info(mddev, argp);
5730 case RESTART_ARRAY_RW:
5731 err = restart_array(mddev);
5735 err = do_md_stop(mddev, 0, 1);
5739 err = md_set_readonly(mddev, 1);
5743 if (get_user(ro, (int __user *)(arg))) {
5749 /* if the bdev is going readonly the value of mddev->ro
5750 * does not matter, no writes are coming
5755 /* are we are already prepared for writes? */
5759 /* transitioning to readauto need only happen for
5760 * arrays that call md_write_start
5763 err = restart_array(mddev);
5766 set_disk_ro(mddev->gendisk, 0);
5773 * The remaining ioctls are changing the state of the
5774 * superblock, so we do not allow them on read-only arrays.
5775 * However non-MD ioctls (e.g. get-size) will still come through
5776 * here and hit the 'default' below, so only disallow
5777 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5779 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5780 if (mddev->ro == 2) {
5782 sysfs_notify_dirent(mddev->sysfs_state);
5783 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5784 md_wakeup_thread(mddev->thread);
5795 mdu_disk_info_t info;
5796 if (copy_from_user(&info, argp, sizeof(info)))
5799 err = add_new_disk(mddev, &info);
5803 case HOT_REMOVE_DISK:
5804 err = hot_remove_disk(mddev, new_decode_dev(arg));
5808 err = hot_add_disk(mddev, new_decode_dev(arg));
5811 case SET_DISK_FAULTY:
5812 err = set_disk_faulty(mddev, new_decode_dev(arg));
5816 err = do_md_run(mddev);
5819 case SET_BITMAP_FILE:
5820 err = set_bitmap_file(mddev, (int)arg);
5830 if (mddev->hold_active == UNTIL_IOCTL &&
5832 mddev->hold_active = 0;
5833 mddev_unlock(mddev);
5842 #ifdef CONFIG_COMPAT
5843 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5844 unsigned int cmd, unsigned long arg)
5847 case HOT_REMOVE_DISK:
5849 case SET_DISK_FAULTY:
5850 case SET_BITMAP_FILE:
5851 /* These take in integer arg, do not convert */
5854 arg = (unsigned long)compat_ptr(arg);
5858 return md_ioctl(bdev, mode, cmd, arg);
5860 #endif /* CONFIG_COMPAT */
5862 static int md_open(struct block_device *bdev, fmode_t mode)
5865 * Succeed if we can lock the mddev, which confirms that
5866 * it isn't being stopped right now.
5868 mddev_t *mddev = mddev_find(bdev->bd_dev);
5871 if (mddev->gendisk != bdev->bd_disk) {
5872 /* we are racing with mddev_put which is discarding this
5876 /* Wait until bdev->bd_disk is definitely gone */
5877 flush_scheduled_work();
5878 /* Then retry the open from the top */
5879 return -ERESTARTSYS;
5881 BUG_ON(mddev != bdev->bd_disk->private_data);
5883 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5887 atomic_inc(&mddev->openers);
5888 mutex_unlock(&mddev->open_mutex);
5894 static int md_release(struct gendisk *disk, fmode_t mode)
5896 mddev_t *mddev = disk->private_data;
5899 atomic_dec(&mddev->openers);
5904 static const struct block_device_operations md_fops =
5906 .owner = THIS_MODULE,
5908 .release = md_release,
5910 #ifdef CONFIG_COMPAT
5911 .compat_ioctl = md_compat_ioctl,
5913 .getgeo = md_getgeo,
5916 static int md_thread(void * arg)
5918 mdk_thread_t *thread = arg;
5921 * md_thread is a 'system-thread', it's priority should be very
5922 * high. We avoid resource deadlocks individually in each
5923 * raid personality. (RAID5 does preallocation) We also use RR and
5924 * the very same RT priority as kswapd, thus we will never get
5925 * into a priority inversion deadlock.
5927 * we definitely have to have equal or higher priority than
5928 * bdflush, otherwise bdflush will deadlock if there are too
5929 * many dirty RAID5 blocks.
5932 allow_signal(SIGKILL);
5933 while (!kthread_should_stop()) {
5935 /* We need to wait INTERRUPTIBLE so that
5936 * we don't add to the load-average.
5937 * That means we need to be sure no signals are
5940 if (signal_pending(current))
5941 flush_signals(current);
5943 wait_event_interruptible_timeout
5945 test_bit(THREAD_WAKEUP, &thread->flags)
5946 || kthread_should_stop(),
5949 clear_bit(THREAD_WAKEUP, &thread->flags);
5951 thread->run(thread->mddev);
5957 void md_wakeup_thread(mdk_thread_t *thread)
5960 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5961 set_bit(THREAD_WAKEUP, &thread->flags);
5962 wake_up(&thread->wqueue);
5966 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5969 mdk_thread_t *thread;
5971 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5975 init_waitqueue_head(&thread->wqueue);
5978 thread->mddev = mddev;
5979 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5980 thread->tsk = kthread_run(md_thread, thread,
5982 mdname(thread->mddev),
5983 name ?: mddev->pers->name);
5984 if (IS_ERR(thread->tsk)) {
5991 void md_unregister_thread(mdk_thread_t *thread)
5995 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5997 kthread_stop(thread->tsk);
6001 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6008 if (!rdev || test_bit(Faulty, &rdev->flags))
6011 if (mddev->external)
6012 set_bit(Blocked, &rdev->flags);
6014 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6016 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6017 __builtin_return_address(0),__builtin_return_address(1),
6018 __builtin_return_address(2),__builtin_return_address(3));
6022 if (!mddev->pers->error_handler)
6024 mddev->pers->error_handler(mddev,rdev);
6025 if (mddev->degraded)
6026 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6027 sysfs_notify_dirent(rdev->sysfs_state);
6028 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6029 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6030 md_wakeup_thread(mddev->thread);
6031 md_new_event_inintr(mddev);
6034 /* seq_file implementation /proc/mdstat */
6036 static void status_unused(struct seq_file *seq)
6041 seq_printf(seq, "unused devices: ");
6043 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6044 char b[BDEVNAME_SIZE];
6046 seq_printf(seq, "%s ",
6047 bdevname(rdev->bdev,b));
6050 seq_printf(seq, "<none>");
6052 seq_printf(seq, "\n");
6056 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6058 sector_t max_sectors, resync, res;
6059 unsigned long dt, db;
6062 unsigned int per_milli;
6064 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6066 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6067 max_sectors = mddev->resync_max_sectors;
6069 max_sectors = mddev->dev_sectors;
6072 * Should not happen.
6078 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6079 * in a sector_t, and (max_sectors>>scale) will fit in a
6080 * u32, as those are the requirements for sector_div.
6081 * Thus 'scale' must be at least 10
6084 if (sizeof(sector_t) > sizeof(unsigned long)) {
6085 while ( max_sectors/2 > (1ULL<<(scale+32)))
6088 res = (resync>>scale)*1000;
6089 sector_div(res, (u32)((max_sectors>>scale)+1));
6093 int i, x = per_milli/50, y = 20-x;
6094 seq_printf(seq, "[");
6095 for (i = 0; i < x; i++)
6096 seq_printf(seq, "=");
6097 seq_printf(seq, ">");
6098 for (i = 0; i < y; i++)
6099 seq_printf(seq, ".");
6100 seq_printf(seq, "] ");
6102 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6103 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6105 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6107 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6108 "resync" : "recovery"))),
6109 per_milli/10, per_milli % 10,
6110 (unsigned long long) resync/2,
6111 (unsigned long long) max_sectors/2);
6114 * dt: time from mark until now
6115 * db: blocks written from mark until now
6116 * rt: remaining time
6118 * rt is a sector_t, so could be 32bit or 64bit.
6119 * So we divide before multiply in case it is 32bit and close
6121 * We scale the divisor (db) by 32 to avoid loosing precision
6122 * near the end of resync when the number of remaining sectors
6124 * We then divide rt by 32 after multiplying by db to compensate.
6125 * The '+1' avoids division by zero if db is very small.
6127 dt = ((jiffies - mddev->resync_mark) / HZ);
6129 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6130 - mddev->resync_mark_cnt;
6132 rt = max_sectors - resync; /* number of remaining sectors */
6133 sector_div(rt, db/32+1);
6137 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6138 ((unsigned long)rt % 60)/6);
6140 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6143 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6145 struct list_head *tmp;
6155 spin_lock(&all_mddevs_lock);
6156 list_for_each(tmp,&all_mddevs)
6158 mddev = list_entry(tmp, mddev_t, all_mddevs);
6160 spin_unlock(&all_mddevs_lock);
6163 spin_unlock(&all_mddevs_lock);
6165 return (void*)2;/* tail */
6169 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6171 struct list_head *tmp;
6172 mddev_t *next_mddev, *mddev = v;
6178 spin_lock(&all_mddevs_lock);
6180 tmp = all_mddevs.next;
6182 tmp = mddev->all_mddevs.next;
6183 if (tmp != &all_mddevs)
6184 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6186 next_mddev = (void*)2;
6189 spin_unlock(&all_mddevs_lock);
6197 static void md_seq_stop(struct seq_file *seq, void *v)
6201 if (mddev && v != (void*)1 && v != (void*)2)
6205 struct mdstat_info {
6209 static int md_seq_show(struct seq_file *seq, void *v)
6214 struct mdstat_info *mi = seq->private;
6215 struct bitmap *bitmap;
6217 if (v == (void*)1) {
6218 struct mdk_personality *pers;
6219 seq_printf(seq, "Personalities : ");
6220 spin_lock(&pers_lock);
6221 list_for_each_entry(pers, &pers_list, list)
6222 seq_printf(seq, "[%s] ", pers->name);
6224 spin_unlock(&pers_lock);
6225 seq_printf(seq, "\n");
6226 mi->event = atomic_read(&md_event_count);
6229 if (v == (void*)2) {
6234 if (mddev_lock(mddev) < 0)
6237 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6238 seq_printf(seq, "%s : %sactive", mdname(mddev),
6239 mddev->pers ? "" : "in");
6242 seq_printf(seq, " (read-only)");
6244 seq_printf(seq, " (auto-read-only)");
6245 seq_printf(seq, " %s", mddev->pers->name);
6249 list_for_each_entry(rdev, &mddev->disks, same_set) {
6250 char b[BDEVNAME_SIZE];
6251 seq_printf(seq, " %s[%d]",
6252 bdevname(rdev->bdev,b), rdev->desc_nr);
6253 if (test_bit(WriteMostly, &rdev->flags))
6254 seq_printf(seq, "(W)");
6255 if (test_bit(Faulty, &rdev->flags)) {
6256 seq_printf(seq, "(F)");
6258 } else if (rdev->raid_disk < 0)
6259 seq_printf(seq, "(S)"); /* spare */
6260 sectors += rdev->sectors;
6263 if (!list_empty(&mddev->disks)) {
6265 seq_printf(seq, "\n %llu blocks",
6266 (unsigned long long)
6267 mddev->array_sectors / 2);
6269 seq_printf(seq, "\n %llu blocks",
6270 (unsigned long long)sectors / 2);
6272 if (mddev->persistent) {
6273 if (mddev->major_version != 0 ||
6274 mddev->minor_version != 90) {
6275 seq_printf(seq," super %d.%d",
6276 mddev->major_version,
6277 mddev->minor_version);
6279 } else if (mddev->external)
6280 seq_printf(seq, " super external:%s",
6281 mddev->metadata_type);
6283 seq_printf(seq, " super non-persistent");
6286 mddev->pers->status(seq, mddev);
6287 seq_printf(seq, "\n ");
6288 if (mddev->pers->sync_request) {
6289 if (mddev->curr_resync > 2) {
6290 status_resync(seq, mddev);
6291 seq_printf(seq, "\n ");
6292 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6293 seq_printf(seq, "\tresync=DELAYED\n ");
6294 else if (mddev->recovery_cp < MaxSector)
6295 seq_printf(seq, "\tresync=PENDING\n ");
6298 seq_printf(seq, "\n ");
6300 if ((bitmap = mddev->bitmap)) {
6301 unsigned long chunk_kb;
6302 unsigned long flags;
6303 spin_lock_irqsave(&bitmap->lock, flags);
6304 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6305 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6307 bitmap->pages - bitmap->missing_pages,
6309 (bitmap->pages - bitmap->missing_pages)
6310 << (PAGE_SHIFT - 10),
6311 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6312 chunk_kb ? "KB" : "B");
6314 seq_printf(seq, ", file: ");
6315 seq_path(seq, &bitmap->file->f_path, " \t\n");
6318 seq_printf(seq, "\n");
6319 spin_unlock_irqrestore(&bitmap->lock, flags);
6322 seq_printf(seq, "\n");
6324 mddev_unlock(mddev);
6329 static const struct seq_operations md_seq_ops = {
6330 .start = md_seq_start,
6331 .next = md_seq_next,
6332 .stop = md_seq_stop,
6333 .show = md_seq_show,
6336 static int md_seq_open(struct inode *inode, struct file *file)
6339 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6343 error = seq_open(file, &md_seq_ops);
6347 struct seq_file *p = file->private_data;
6349 mi->event = atomic_read(&md_event_count);
6354 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6356 struct seq_file *m = filp->private_data;
6357 struct mdstat_info *mi = m->private;
6360 poll_wait(filp, &md_event_waiters, wait);
6362 /* always allow read */
6363 mask = POLLIN | POLLRDNORM;
6365 if (mi->event != atomic_read(&md_event_count))
6366 mask |= POLLERR | POLLPRI;
6370 static const struct file_operations md_seq_fops = {
6371 .owner = THIS_MODULE,
6372 .open = md_seq_open,
6374 .llseek = seq_lseek,
6375 .release = seq_release_private,
6376 .poll = mdstat_poll,
6379 int register_md_personality(struct mdk_personality *p)
6381 spin_lock(&pers_lock);
6382 list_add_tail(&p->list, &pers_list);
6383 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6384 spin_unlock(&pers_lock);
6388 int unregister_md_personality(struct mdk_personality *p)
6390 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6391 spin_lock(&pers_lock);
6392 list_del_init(&p->list);
6393 spin_unlock(&pers_lock);
6397 static int is_mddev_idle(mddev_t *mddev, int init)
6405 rdev_for_each_rcu(rdev, mddev) {
6406 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6407 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6408 (int)part_stat_read(&disk->part0, sectors[1]) -
6409 atomic_read(&disk->sync_io);
6410 /* sync IO will cause sync_io to increase before the disk_stats
6411 * as sync_io is counted when a request starts, and
6412 * disk_stats is counted when it completes.
6413 * So resync activity will cause curr_events to be smaller than
6414 * when there was no such activity.
6415 * non-sync IO will cause disk_stat to increase without
6416 * increasing sync_io so curr_events will (eventually)
6417 * be larger than it was before. Once it becomes
6418 * substantially larger, the test below will cause
6419 * the array to appear non-idle, and resync will slow
6421 * If there is a lot of outstanding resync activity when
6422 * we set last_event to curr_events, then all that activity
6423 * completing might cause the array to appear non-idle
6424 * and resync will be slowed down even though there might
6425 * not have been non-resync activity. This will only
6426 * happen once though. 'last_events' will soon reflect
6427 * the state where there is little or no outstanding
6428 * resync requests, and further resync activity will
6429 * always make curr_events less than last_events.
6432 if (init || curr_events - rdev->last_events > 64) {
6433 rdev->last_events = curr_events;
6441 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6443 /* another "blocks" (512byte) blocks have been synced */
6444 atomic_sub(blocks, &mddev->recovery_active);
6445 wake_up(&mddev->recovery_wait);
6447 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6448 md_wakeup_thread(mddev->thread);
6449 // stop recovery, signal do_sync ....
6454 /* md_write_start(mddev, bi)
6455 * If we need to update some array metadata (e.g. 'active' flag
6456 * in superblock) before writing, schedule a superblock update
6457 * and wait for it to complete.
6459 void md_write_start(mddev_t *mddev, struct bio *bi)
6462 if (bio_data_dir(bi) != WRITE)
6465 BUG_ON(mddev->ro == 1);
6466 if (mddev->ro == 2) {
6467 /* need to switch to read/write */
6469 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6470 md_wakeup_thread(mddev->thread);
6471 md_wakeup_thread(mddev->sync_thread);
6474 atomic_inc(&mddev->writes_pending);
6475 if (mddev->safemode == 1)
6476 mddev->safemode = 0;
6477 if (mddev->in_sync) {
6478 spin_lock_irq(&mddev->write_lock);
6479 if (mddev->in_sync) {
6481 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6482 md_wakeup_thread(mddev->thread);
6485 spin_unlock_irq(&mddev->write_lock);
6488 sysfs_notify_dirent(mddev->sysfs_state);
6489 wait_event(mddev->sb_wait,
6490 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6491 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6494 void md_write_end(mddev_t *mddev)
6496 if (atomic_dec_and_test(&mddev->writes_pending)) {
6497 if (mddev->safemode == 2)
6498 md_wakeup_thread(mddev->thread);
6499 else if (mddev->safemode_delay)
6500 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6504 /* md_allow_write(mddev)
6505 * Calling this ensures that the array is marked 'active' so that writes
6506 * may proceed without blocking. It is important to call this before
6507 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6508 * Must be called with mddev_lock held.
6510 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6511 * is dropped, so return -EAGAIN after notifying userspace.
6513 int md_allow_write(mddev_t *mddev)
6519 if (!mddev->pers->sync_request)
6522 spin_lock_irq(&mddev->write_lock);
6523 if (mddev->in_sync) {
6525 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6526 if (mddev->safemode_delay &&
6527 mddev->safemode == 0)
6528 mddev->safemode = 1;
6529 spin_unlock_irq(&mddev->write_lock);
6530 md_update_sb(mddev, 0);
6531 sysfs_notify_dirent(mddev->sysfs_state);
6533 spin_unlock_irq(&mddev->write_lock);
6535 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6540 EXPORT_SYMBOL_GPL(md_allow_write);
6542 #define SYNC_MARKS 10
6543 #define SYNC_MARK_STEP (3*HZ)
6544 void md_do_sync(mddev_t *mddev)
6547 unsigned int currspeed = 0,
6549 sector_t max_sectors,j, io_sectors;
6550 unsigned long mark[SYNC_MARKS];
6551 sector_t mark_cnt[SYNC_MARKS];
6553 struct list_head *tmp;
6554 sector_t last_check;
6559 /* just incase thread restarts... */
6560 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6562 if (mddev->ro) /* never try to sync a read-only array */
6565 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6566 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6567 desc = "data-check";
6568 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6569 desc = "requested-resync";
6572 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6577 /* we overload curr_resync somewhat here.
6578 * 0 == not engaged in resync at all
6579 * 2 == checking that there is no conflict with another sync
6580 * 1 == like 2, but have yielded to allow conflicting resync to
6582 * other == active in resync - this many blocks
6584 * Before starting a resync we must have set curr_resync to
6585 * 2, and then checked that every "conflicting" array has curr_resync
6586 * less than ours. When we find one that is the same or higher
6587 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6588 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6589 * This will mean we have to start checking from the beginning again.
6594 mddev->curr_resync = 2;
6597 if (kthread_should_stop())
6598 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6600 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6602 for_each_mddev(mddev2, tmp) {
6603 if (mddev2 == mddev)
6605 if (!mddev->parallel_resync
6606 && mddev2->curr_resync
6607 && match_mddev_units(mddev, mddev2)) {
6609 if (mddev < mddev2 && mddev->curr_resync == 2) {
6610 /* arbitrarily yield */
6611 mddev->curr_resync = 1;
6612 wake_up(&resync_wait);
6614 if (mddev > mddev2 && mddev->curr_resync == 1)
6615 /* no need to wait here, we can wait the next
6616 * time 'round when curr_resync == 2
6619 /* We need to wait 'interruptible' so as not to
6620 * contribute to the load average, and not to
6621 * be caught by 'softlockup'
6623 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6624 if (!kthread_should_stop() &&
6625 mddev2->curr_resync >= mddev->curr_resync) {
6626 printk(KERN_INFO "md: delaying %s of %s"
6627 " until %s has finished (they"
6628 " share one or more physical units)\n",
6629 desc, mdname(mddev), mdname(mddev2));
6631 if (signal_pending(current))
6632 flush_signals(current);
6634 finish_wait(&resync_wait, &wq);
6637 finish_wait(&resync_wait, &wq);
6640 } while (mddev->curr_resync < 2);
6643 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6644 /* resync follows the size requested by the personality,
6645 * which defaults to physical size, but can be virtual size
6647 max_sectors = mddev->resync_max_sectors;
6648 mddev->resync_mismatches = 0;
6649 /* we don't use the checkpoint if there's a bitmap */
6650 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6651 j = mddev->resync_min;
6652 else if (!mddev->bitmap)
6653 j = mddev->recovery_cp;
6655 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6656 max_sectors = mddev->dev_sectors;
6658 /* recovery follows the physical size of devices */
6659 max_sectors = mddev->dev_sectors;
6662 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6663 if (rdev->raid_disk >= 0 &&
6664 !test_bit(Faulty, &rdev->flags) &&
6665 !test_bit(In_sync, &rdev->flags) &&
6666 rdev->recovery_offset < j)
6667 j = rdev->recovery_offset;
6671 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6672 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6673 " %d KB/sec/disk.\n", speed_min(mddev));
6674 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6675 "(but not more than %d KB/sec) for %s.\n",
6676 speed_max(mddev), desc);
6678 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6681 for (m = 0; m < SYNC_MARKS; m++) {
6683 mark_cnt[m] = io_sectors;
6686 mddev->resync_mark = mark[last_mark];
6687 mddev->resync_mark_cnt = mark_cnt[last_mark];
6690 * Tune reconstruction:
6692 window = 32*(PAGE_SIZE/512);
6693 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6694 window/2,(unsigned long long) max_sectors/2);
6696 atomic_set(&mddev->recovery_active, 0);
6701 "md: resuming %s of %s from checkpoint.\n",
6702 desc, mdname(mddev));
6703 mddev->curr_resync = j;
6705 mddev->curr_resync_completed = mddev->curr_resync;
6707 while (j < max_sectors) {
6712 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6713 ((mddev->curr_resync > mddev->curr_resync_completed &&
6714 (mddev->curr_resync - mddev->curr_resync_completed)
6715 > (max_sectors >> 4)) ||
6716 (j - mddev->curr_resync_completed)*2
6717 >= mddev->resync_max - mddev->curr_resync_completed
6719 /* time to update curr_resync_completed */
6720 blk_unplug(mddev->queue);
6721 wait_event(mddev->recovery_wait,
6722 atomic_read(&mddev->recovery_active) == 0);
6723 mddev->curr_resync_completed =
6725 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6726 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6729 while (j >= mddev->resync_max && !kthread_should_stop()) {
6730 /* As this condition is controlled by user-space,
6731 * we can block indefinitely, so use '_interruptible'
6732 * to avoid triggering warnings.
6734 flush_signals(current); /* just in case */
6735 wait_event_interruptible(mddev->recovery_wait,
6736 mddev->resync_max > j
6737 || kthread_should_stop());
6740 if (kthread_should_stop())
6743 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6744 currspeed < speed_min(mddev));
6746 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6750 if (!skipped) { /* actual IO requested */
6751 io_sectors += sectors;
6752 atomic_add(sectors, &mddev->recovery_active);
6756 if (j>1) mddev->curr_resync = j;
6757 mddev->curr_mark_cnt = io_sectors;
6758 if (last_check == 0)
6759 /* this is the earliers that rebuilt will be
6760 * visible in /proc/mdstat
6762 md_new_event(mddev);
6764 if (last_check + window > io_sectors || j == max_sectors)
6767 last_check = io_sectors;
6769 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6773 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6775 int next = (last_mark+1) % SYNC_MARKS;
6777 mddev->resync_mark = mark[next];
6778 mddev->resync_mark_cnt = mark_cnt[next];
6779 mark[next] = jiffies;
6780 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6785 if (kthread_should_stop())
6790 * this loop exits only if either when we are slower than
6791 * the 'hard' speed limit, or the system was IO-idle for
6793 * the system might be non-idle CPU-wise, but we only care
6794 * about not overloading the IO subsystem. (things like an
6795 * e2fsck being done on the RAID array should execute fast)
6797 blk_unplug(mddev->queue);
6800 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6801 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6803 if (currspeed > speed_min(mddev)) {
6804 if ((currspeed > speed_max(mddev)) ||
6805 !is_mddev_idle(mddev, 0)) {
6811 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6813 * this also signals 'finished resyncing' to md_stop
6816 blk_unplug(mddev->queue);
6818 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6820 /* tell personality that we are finished */
6821 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6823 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6824 mddev->curr_resync > 2) {
6825 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6826 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6827 if (mddev->curr_resync >= mddev->recovery_cp) {
6829 "md: checkpointing %s of %s.\n",
6830 desc, mdname(mddev));
6831 mddev->recovery_cp = mddev->curr_resync;
6834 mddev->recovery_cp = MaxSector;
6836 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6837 mddev->curr_resync = MaxSector;
6839 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6840 if (rdev->raid_disk >= 0 &&
6841 !test_bit(Faulty, &rdev->flags) &&
6842 !test_bit(In_sync, &rdev->flags) &&
6843 rdev->recovery_offset < mddev->curr_resync)
6844 rdev->recovery_offset = mddev->curr_resync;
6848 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6851 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6852 /* We completed so min/max setting can be forgotten if used. */
6853 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6854 mddev->resync_min = 0;
6855 mddev->resync_max = MaxSector;
6856 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6857 mddev->resync_min = mddev->curr_resync_completed;
6858 mddev->curr_resync = 0;
6859 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6860 mddev->curr_resync_completed = 0;
6861 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6862 wake_up(&resync_wait);
6863 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6864 md_wakeup_thread(mddev->thread);
6869 * got a signal, exit.
6872 "md: md_do_sync() got signal ... exiting\n");
6873 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6877 EXPORT_SYMBOL_GPL(md_do_sync);
6880 static int remove_and_add_spares(mddev_t *mddev)
6885 mddev->curr_resync_completed = 0;
6887 list_for_each_entry(rdev, &mddev->disks, same_set)
6888 if (rdev->raid_disk >= 0 &&
6889 !test_bit(Blocked, &rdev->flags) &&
6890 (test_bit(Faulty, &rdev->flags) ||
6891 ! test_bit(In_sync, &rdev->flags)) &&
6892 atomic_read(&rdev->nr_pending)==0) {
6893 if (mddev->pers->hot_remove_disk(
6894 mddev, rdev->raid_disk)==0) {
6896 sprintf(nm,"rd%d", rdev->raid_disk);
6897 sysfs_remove_link(&mddev->kobj, nm);
6898 rdev->raid_disk = -1;
6902 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6903 list_for_each_entry(rdev, &mddev->disks, same_set) {
6904 if (rdev->raid_disk >= 0 &&
6905 !test_bit(In_sync, &rdev->flags) &&
6906 !test_bit(Blocked, &rdev->flags))
6908 if (rdev->raid_disk < 0
6909 && !test_bit(Faulty, &rdev->flags)) {
6910 rdev->recovery_offset = 0;
6912 hot_add_disk(mddev, rdev) == 0) {
6914 sprintf(nm, "rd%d", rdev->raid_disk);
6915 if (sysfs_create_link(&mddev->kobj,
6918 "md: cannot register "
6922 md_new_event(mddev);
6923 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6932 * This routine is regularly called by all per-raid-array threads to
6933 * deal with generic issues like resync and super-block update.
6934 * Raid personalities that don't have a thread (linear/raid0) do not
6935 * need this as they never do any recovery or update the superblock.
6937 * It does not do any resync itself, but rather "forks" off other threads
6938 * to do that as needed.
6939 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6940 * "->recovery" and create a thread at ->sync_thread.
6941 * When the thread finishes it sets MD_RECOVERY_DONE
6942 * and wakeups up this thread which will reap the thread and finish up.
6943 * This thread also removes any faulty devices (with nr_pending == 0).
6945 * The overall approach is:
6946 * 1/ if the superblock needs updating, update it.
6947 * 2/ If a recovery thread is running, don't do anything else.
6948 * 3/ If recovery has finished, clean up, possibly marking spares active.
6949 * 4/ If there are any faulty devices, remove them.
6950 * 5/ If array is degraded, try to add spares devices
6951 * 6/ If array has spares or is not in-sync, start a resync thread.
6953 void md_check_recovery(mddev_t *mddev)
6959 bitmap_daemon_work(mddev);
6964 if (signal_pending(current)) {
6965 if (mddev->pers->sync_request && !mddev->external) {
6966 printk(KERN_INFO "md: %s in immediate safe mode\n",
6968 mddev->safemode = 2;
6970 flush_signals(current);
6973 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6976 (mddev->flags && !mddev->external) ||
6977 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6978 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6979 (mddev->external == 0 && mddev->safemode == 1) ||
6980 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6981 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6985 if (mddev_trylock(mddev)) {
6989 /* Only thing we do on a ro array is remove
6992 remove_and_add_spares(mddev);
6993 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6997 if (!mddev->external) {
6999 spin_lock_irq(&mddev->write_lock);
7000 if (mddev->safemode &&
7001 !atomic_read(&mddev->writes_pending) &&
7003 mddev->recovery_cp == MaxSector) {
7006 if (mddev->persistent)
7007 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7009 if (mddev->safemode == 1)
7010 mddev->safemode = 0;
7011 spin_unlock_irq(&mddev->write_lock);
7013 sysfs_notify_dirent(mddev->sysfs_state);
7017 md_update_sb(mddev, 0);
7019 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7020 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7021 /* resync/recovery still happening */
7022 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7025 if (mddev->sync_thread) {
7026 /* resync has finished, collect result */
7027 md_unregister_thread(mddev->sync_thread);
7028 mddev->sync_thread = NULL;
7029 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7030 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7032 /* activate any spares */
7033 if (mddev->pers->spare_active(mddev))
7034 sysfs_notify(&mddev->kobj, NULL,
7037 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7038 mddev->pers->finish_reshape)
7039 mddev->pers->finish_reshape(mddev);
7040 md_update_sb(mddev, 1);
7042 /* if array is no-longer degraded, then any saved_raid_disk
7043 * information must be scrapped
7045 if (!mddev->degraded)
7046 list_for_each_entry(rdev, &mddev->disks, same_set)
7047 rdev->saved_raid_disk = -1;
7049 mddev->recovery = 0;
7050 /* flag recovery needed just to double check */
7051 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7052 sysfs_notify_dirent(mddev->sysfs_action);
7053 md_new_event(mddev);
7056 /* Set RUNNING before clearing NEEDED to avoid
7057 * any transients in the value of "sync_action".
7059 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7060 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7061 /* Clear some bits that don't mean anything, but
7064 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7065 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7067 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7069 /* no recovery is running.
7070 * remove any failed drives, then
7071 * add spares if possible.
7072 * Spare are also removed and re-added, to allow
7073 * the personality to fail the re-add.
7076 if (mddev->reshape_position != MaxSector) {
7077 if (mddev->pers->check_reshape == NULL ||
7078 mddev->pers->check_reshape(mddev) != 0)
7079 /* Cannot proceed */
7081 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7082 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7083 } else if ((spares = remove_and_add_spares(mddev))) {
7084 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7085 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7086 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7087 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7088 } else if (mddev->recovery_cp < MaxSector) {
7089 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7090 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7091 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7092 /* nothing to be done ... */
7095 if (mddev->pers->sync_request) {
7096 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7097 /* We are adding a device or devices to an array
7098 * which has the bitmap stored on all devices.
7099 * So make sure all bitmap pages get written
7101 bitmap_write_all(mddev->bitmap);
7103 mddev->sync_thread = md_register_thread(md_do_sync,
7106 if (!mddev->sync_thread) {
7107 printk(KERN_ERR "%s: could not start resync"
7110 /* leave the spares where they are, it shouldn't hurt */
7111 mddev->recovery = 0;
7113 md_wakeup_thread(mddev->sync_thread);
7114 sysfs_notify_dirent(mddev->sysfs_action);
7115 md_new_event(mddev);
7118 if (!mddev->sync_thread) {
7119 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7120 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7122 if (mddev->sysfs_action)
7123 sysfs_notify_dirent(mddev->sysfs_action);
7125 mddev_unlock(mddev);
7129 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7131 sysfs_notify_dirent(rdev->sysfs_state);
7132 wait_event_timeout(rdev->blocked_wait,
7133 !test_bit(Blocked, &rdev->flags),
7134 msecs_to_jiffies(5000));
7135 rdev_dec_pending(rdev, mddev);
7137 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7139 static int md_notify_reboot(struct notifier_block *this,
7140 unsigned long code, void *x)
7142 struct list_head *tmp;
7145 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7147 printk(KERN_INFO "md: stopping all md devices.\n");
7149 for_each_mddev(mddev, tmp)
7150 if (mddev_trylock(mddev)) {
7151 /* Force a switch to readonly even array
7152 * appears to still be in use. Hence
7155 md_set_readonly(mddev, 100);
7156 mddev_unlock(mddev);
7159 * certain more exotic SCSI devices are known to be
7160 * volatile wrt too early system reboots. While the
7161 * right place to handle this issue is the given
7162 * driver, we do want to have a safe RAID driver ...
7169 static struct notifier_block md_notifier = {
7170 .notifier_call = md_notify_reboot,
7172 .priority = INT_MAX, /* before any real devices */
7175 static void md_geninit(void)
7177 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7179 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7182 static int __init md_init(void)
7184 if (register_blkdev(MD_MAJOR, "md"))
7186 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7187 unregister_blkdev(MD_MAJOR, "md");
7190 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7191 md_probe, NULL, NULL);
7192 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7193 md_probe, NULL, NULL);
7195 register_reboot_notifier(&md_notifier);
7196 raid_table_header = register_sysctl_table(raid_root_table);
7206 * Searches all registered partitions for autorun RAID arrays
7210 static LIST_HEAD(all_detected_devices);
7211 struct detected_devices_node {
7212 struct list_head list;
7216 void md_autodetect_dev(dev_t dev)
7218 struct detected_devices_node *node_detected_dev;
7220 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7221 if (node_detected_dev) {
7222 node_detected_dev->dev = dev;
7223 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7225 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7226 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7231 static void autostart_arrays(int part)
7234 struct detected_devices_node *node_detected_dev;
7236 int i_scanned, i_passed;
7241 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7243 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7245 node_detected_dev = list_entry(all_detected_devices.next,
7246 struct detected_devices_node, list);
7247 list_del(&node_detected_dev->list);
7248 dev = node_detected_dev->dev;
7249 kfree(node_detected_dev);
7250 rdev = md_import_device(dev,0, 90);
7254 if (test_bit(Faulty, &rdev->flags)) {
7258 set_bit(AutoDetected, &rdev->flags);
7259 list_add(&rdev->same_set, &pending_raid_disks);
7263 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7264 i_scanned, i_passed);
7266 autorun_devices(part);
7269 #endif /* !MODULE */
7271 static __exit void md_exit(void)
7274 struct list_head *tmp;
7276 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7277 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7279 unregister_blkdev(MD_MAJOR,"md");
7280 unregister_blkdev(mdp_major, "mdp");
7281 unregister_reboot_notifier(&md_notifier);
7282 unregister_sysctl_table(raid_table_header);
7283 remove_proc_entry("mdstat", NULL);
7284 for_each_mddev(mddev, tmp) {
7285 export_array(mddev);
7286 mddev->hold_active = 0;
7290 subsys_initcall(md_init);
7291 module_exit(md_exit)
7293 static int get_ro(char *buffer, struct kernel_param *kp)
7295 return sprintf(buffer, "%d", start_readonly);
7297 static int set_ro(const char *val, struct kernel_param *kp)
7300 int num = simple_strtoul(val, &e, 10);
7301 if (*val && (*e == '\0' || *e == '\n')) {
7302 start_readonly = num;
7308 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7309 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7311 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7313 EXPORT_SYMBOL(register_md_personality);
7314 EXPORT_SYMBOL(unregister_md_personality);
7315 EXPORT_SYMBOL(md_error);
7316 EXPORT_SYMBOL(md_done_sync);
7317 EXPORT_SYMBOL(md_write_start);
7318 EXPORT_SYMBOL(md_write_end);
7319 EXPORT_SYMBOL(md_register_thread);
7320 EXPORT_SYMBOL(md_unregister_thread);
7321 EXPORT_SYMBOL(md_wakeup_thread);
7322 EXPORT_SYMBOL(md_check_recovery);
7323 MODULE_LICENSE("GPL");
7324 MODULE_DESCRIPTION("MD RAID framework");
7326 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);