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>
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/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.h"
59 static void autostart_arrays(int part);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list);
68 static DEFINE_SPINLOCK(pers_lock);
70 struct md_cluster_operations *md_cluster_ops;
71 EXPORT_SYMBOL(md_cluster_ops);
72 struct module *md_cluster_mod;
73 EXPORT_SYMBOL(md_cluster_mod);
75 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
76 static struct workqueue_struct *md_wq;
77 static struct workqueue_struct *md_misc_wq;
79 static int remove_and_add_spares(struct mddev *mddev,
80 struct md_rdev *this);
81 static void mddev_detach(struct mddev *mddev);
84 * Default number of read corrections we'll attempt on an rdev
85 * before ejecting it from the array. We divide the read error
86 * count by 2 for every hour elapsed between read errors.
88 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
90 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
91 * is 1000 KB/sec, so the extra system load does not show up that much.
92 * Increase it if you want to have more _guaranteed_ speed. Note that
93 * the RAID driver will use the maximum available bandwidth if the IO
94 * subsystem is idle. There is also an 'absolute maximum' reconstruction
95 * speed limit - in case reconstruction slows down your system despite
98 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
99 * or /sys/block/mdX/md/sync_speed_{min,max}
102 static int sysctl_speed_limit_min = 1000;
103 static int sysctl_speed_limit_max = 200000;
104 static inline int speed_min(struct mddev *mddev)
106 return mddev->sync_speed_min ?
107 mddev->sync_speed_min : sysctl_speed_limit_min;
110 static inline int speed_max(struct mddev *mddev)
112 return mddev->sync_speed_max ?
113 mddev->sync_speed_max : sysctl_speed_limit_max;
116 static struct ctl_table_header *raid_table_header;
118 static struct ctl_table raid_table[] = {
120 .procname = "speed_limit_min",
121 .data = &sysctl_speed_limit_min,
122 .maxlen = sizeof(int),
123 .mode = S_IRUGO|S_IWUSR,
124 .proc_handler = proc_dointvec,
127 .procname = "speed_limit_max",
128 .data = &sysctl_speed_limit_max,
129 .maxlen = sizeof(int),
130 .mode = S_IRUGO|S_IWUSR,
131 .proc_handler = proc_dointvec,
136 static struct ctl_table raid_dir_table[] = {
140 .mode = S_IRUGO|S_IXUGO,
146 static struct ctl_table raid_root_table[] = {
151 .child = raid_dir_table,
156 static const struct block_device_operations md_fops;
158 static int start_readonly;
161 * like bio_clone, but with a local bio set
164 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
169 if (!mddev || !mddev->bio_set)
170 return bio_alloc(gfp_mask, nr_iovecs);
172 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
177 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
179 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
182 if (!mddev || !mddev->bio_set)
183 return bio_clone(bio, gfp_mask);
185 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
187 EXPORT_SYMBOL_GPL(bio_clone_mddev);
190 * We have a system wide 'event count' that is incremented
191 * on any 'interesting' event, and readers of /proc/mdstat
192 * can use 'poll' or 'select' to find out when the event
196 * start array, stop array, error, add device, remove device,
197 * start build, activate spare
199 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
200 static atomic_t md_event_count;
201 void md_new_event(struct mddev *mddev)
203 atomic_inc(&md_event_count);
204 wake_up(&md_event_waiters);
206 EXPORT_SYMBOL_GPL(md_new_event);
208 /* Alternate version that can be called from interrupts
209 * when calling sysfs_notify isn't needed.
211 static void md_new_event_inintr(struct mddev *mddev)
213 atomic_inc(&md_event_count);
214 wake_up(&md_event_waiters);
218 * Enables to iterate over all existing md arrays
219 * all_mddevs_lock protects this list.
221 static LIST_HEAD(all_mddevs);
222 static DEFINE_SPINLOCK(all_mddevs_lock);
225 * iterates through all used mddevs in the system.
226 * We take care to grab the all_mddevs_lock whenever navigating
227 * the list, and to always hold a refcount when unlocked.
228 * Any code which breaks out of this loop while own
229 * a reference to the current mddev and must mddev_put it.
231 #define for_each_mddev(_mddev,_tmp) \
233 for (({ spin_lock(&all_mddevs_lock); \
234 _tmp = all_mddevs.next; \
236 ({ if (_tmp != &all_mddevs) \
237 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
238 spin_unlock(&all_mddevs_lock); \
239 if (_mddev) mddev_put(_mddev); \
240 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
241 _tmp != &all_mddevs;}); \
242 ({ spin_lock(&all_mddevs_lock); \
243 _tmp = _tmp->next;}) \
246 /* Rather than calling directly into the personality make_request function,
247 * IO requests come here first so that we can check if the device is
248 * being suspended pending a reconfiguration.
249 * We hold a refcount over the call to ->make_request. By the time that
250 * call has finished, the bio has been linked into some internal structure
251 * and so is visible to ->quiesce(), so we don't need the refcount any more.
253 static void md_make_request(struct request_queue *q, struct bio *bio)
255 const int rw = bio_data_dir(bio);
256 struct mddev *mddev = q->queuedata;
257 unsigned int sectors;
260 blk_queue_split(q, &bio, q->bio_split);
262 if (mddev == NULL || mddev->pers == NULL
267 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
268 if (bio_sectors(bio) != 0)
269 bio->bi_error = -EROFS;
273 smp_rmb(); /* Ensure implications of 'active' are visible */
275 if (mddev->suspended) {
278 prepare_to_wait(&mddev->sb_wait, &__wait,
279 TASK_UNINTERRUPTIBLE);
280 if (!mddev->suspended)
286 finish_wait(&mddev->sb_wait, &__wait);
288 atomic_inc(&mddev->active_io);
292 * save the sectors now since our bio can
293 * go away inside make_request
295 sectors = bio_sectors(bio);
296 mddev->pers->make_request(mddev, bio);
298 cpu = part_stat_lock();
299 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
300 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
303 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
304 wake_up(&mddev->sb_wait);
307 /* mddev_suspend makes sure no new requests are submitted
308 * to the device, and that any requests that have been submitted
309 * are completely handled.
310 * Once mddev_detach() is called and completes, the module will be
313 void mddev_suspend(struct mddev *mddev)
315 BUG_ON(mddev->suspended);
316 mddev->suspended = 1;
318 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
319 mddev->pers->quiesce(mddev, 1);
321 del_timer_sync(&mddev->safemode_timer);
323 EXPORT_SYMBOL_GPL(mddev_suspend);
325 void mddev_resume(struct mddev *mddev)
327 mddev->suspended = 0;
328 wake_up(&mddev->sb_wait);
329 mddev->pers->quiesce(mddev, 0);
331 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
332 md_wakeup_thread(mddev->thread);
333 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
335 EXPORT_SYMBOL_GPL(mddev_resume);
337 int mddev_congested(struct mddev *mddev, int bits)
339 struct md_personality *pers = mddev->pers;
343 if (mddev->suspended)
345 else if (pers && pers->congested)
346 ret = pers->congested(mddev, bits);
350 EXPORT_SYMBOL_GPL(mddev_congested);
351 static int md_congested(void *data, int bits)
353 struct mddev *mddev = data;
354 return mddev_congested(mddev, bits);
358 * Generic flush handling for md
361 static void md_end_flush(struct bio *bio)
363 struct md_rdev *rdev = bio->bi_private;
364 struct mddev *mddev = rdev->mddev;
366 rdev_dec_pending(rdev, mddev);
368 if (atomic_dec_and_test(&mddev->flush_pending)) {
369 /* The pre-request flush has finished */
370 queue_work(md_wq, &mddev->flush_work);
375 static void md_submit_flush_data(struct work_struct *ws);
377 static void submit_flushes(struct work_struct *ws)
379 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
380 struct md_rdev *rdev;
382 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
383 atomic_set(&mddev->flush_pending, 1);
385 rdev_for_each_rcu(rdev, mddev)
386 if (rdev->raid_disk >= 0 &&
387 !test_bit(Faulty, &rdev->flags)) {
388 /* Take two references, one is dropped
389 * when request finishes, one after
390 * we reclaim rcu_read_lock
393 atomic_inc(&rdev->nr_pending);
394 atomic_inc(&rdev->nr_pending);
396 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
397 bi->bi_end_io = md_end_flush;
398 bi->bi_private = rdev;
399 bi->bi_bdev = rdev->bdev;
400 atomic_inc(&mddev->flush_pending);
401 submit_bio(WRITE_FLUSH, bi);
403 rdev_dec_pending(rdev, mddev);
406 if (atomic_dec_and_test(&mddev->flush_pending))
407 queue_work(md_wq, &mddev->flush_work);
410 static void md_submit_flush_data(struct work_struct *ws)
412 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
413 struct bio *bio = mddev->flush_bio;
415 if (bio->bi_iter.bi_size == 0)
416 /* an empty barrier - all done */
419 bio->bi_rw &= ~REQ_FLUSH;
420 mddev->pers->make_request(mddev, bio);
423 mddev->flush_bio = NULL;
424 wake_up(&mddev->sb_wait);
427 void md_flush_request(struct mddev *mddev, struct bio *bio)
429 spin_lock_irq(&mddev->lock);
430 wait_event_lock_irq(mddev->sb_wait,
433 mddev->flush_bio = bio;
434 spin_unlock_irq(&mddev->lock);
436 INIT_WORK(&mddev->flush_work, submit_flushes);
437 queue_work(md_wq, &mddev->flush_work);
439 EXPORT_SYMBOL(md_flush_request);
441 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
443 struct mddev *mddev = cb->data;
444 md_wakeup_thread(mddev->thread);
447 EXPORT_SYMBOL(md_unplug);
449 static inline struct mddev *mddev_get(struct mddev *mddev)
451 atomic_inc(&mddev->active);
455 static void mddev_delayed_delete(struct work_struct *ws);
457 static void mddev_put(struct mddev *mddev)
459 struct bio_set *bs = NULL;
461 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
463 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
464 mddev->ctime == 0 && !mddev->hold_active) {
465 /* Array is not configured at all, and not held active,
467 list_del_init(&mddev->all_mddevs);
469 mddev->bio_set = NULL;
470 if (mddev->gendisk) {
471 /* We did a probe so need to clean up. Call
472 * queue_work inside the spinlock so that
473 * flush_workqueue() after mddev_find will
474 * succeed in waiting for the work to be done.
476 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
477 queue_work(md_misc_wq, &mddev->del_work);
481 spin_unlock(&all_mddevs_lock);
486 static void md_safemode_timeout(unsigned long data);
488 void mddev_init(struct mddev *mddev)
490 mutex_init(&mddev->open_mutex);
491 mutex_init(&mddev->reconfig_mutex);
492 mutex_init(&mddev->bitmap_info.mutex);
493 INIT_LIST_HEAD(&mddev->disks);
494 INIT_LIST_HEAD(&mddev->all_mddevs);
495 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
496 (unsigned long) mddev);
497 atomic_set(&mddev->active, 1);
498 atomic_set(&mddev->openers, 0);
499 atomic_set(&mddev->active_io, 0);
500 spin_lock_init(&mddev->lock);
501 atomic_set(&mddev->flush_pending, 0);
502 init_waitqueue_head(&mddev->sb_wait);
503 init_waitqueue_head(&mddev->recovery_wait);
504 mddev->reshape_position = MaxSector;
505 mddev->reshape_backwards = 0;
506 mddev->last_sync_action = "none";
507 mddev->resync_min = 0;
508 mddev->resync_max = MaxSector;
509 mddev->level = LEVEL_NONE;
511 EXPORT_SYMBOL_GPL(mddev_init);
513 static struct mddev *mddev_find(dev_t unit)
515 struct mddev *mddev, *new = NULL;
517 if (unit && MAJOR(unit) != MD_MAJOR)
518 unit &= ~((1<<MdpMinorShift)-1);
521 spin_lock(&all_mddevs_lock);
524 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
525 if (mddev->unit == unit) {
527 spin_unlock(&all_mddevs_lock);
533 list_add(&new->all_mddevs, &all_mddevs);
534 spin_unlock(&all_mddevs_lock);
535 new->hold_active = UNTIL_IOCTL;
539 /* find an unused unit number */
540 static int next_minor = 512;
541 int start = next_minor;
545 dev = MKDEV(MD_MAJOR, next_minor);
547 if (next_minor > MINORMASK)
549 if (next_minor == start) {
550 /* Oh dear, all in use. */
551 spin_unlock(&all_mddevs_lock);
557 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
558 if (mddev->unit == dev) {
564 new->md_minor = MINOR(dev);
565 new->hold_active = UNTIL_STOP;
566 list_add(&new->all_mddevs, &all_mddevs);
567 spin_unlock(&all_mddevs_lock);
570 spin_unlock(&all_mddevs_lock);
572 new = kzalloc(sizeof(*new), GFP_KERNEL);
577 if (MAJOR(unit) == MD_MAJOR)
578 new->md_minor = MINOR(unit);
580 new->md_minor = MINOR(unit) >> MdpMinorShift;
587 static struct attribute_group md_redundancy_group;
589 void mddev_unlock(struct mddev *mddev)
591 if (mddev->to_remove) {
592 /* These cannot be removed under reconfig_mutex as
593 * an access to the files will try to take reconfig_mutex
594 * while holding the file unremovable, which leads to
596 * So hold set sysfs_active while the remove in happeing,
597 * and anything else which might set ->to_remove or my
598 * otherwise change the sysfs namespace will fail with
599 * -EBUSY if sysfs_active is still set.
600 * We set sysfs_active under reconfig_mutex and elsewhere
601 * test it under the same mutex to ensure its correct value
604 struct attribute_group *to_remove = mddev->to_remove;
605 mddev->to_remove = NULL;
606 mddev->sysfs_active = 1;
607 mutex_unlock(&mddev->reconfig_mutex);
609 if (mddev->kobj.sd) {
610 if (to_remove != &md_redundancy_group)
611 sysfs_remove_group(&mddev->kobj, to_remove);
612 if (mddev->pers == NULL ||
613 mddev->pers->sync_request == NULL) {
614 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
615 if (mddev->sysfs_action)
616 sysfs_put(mddev->sysfs_action);
617 mddev->sysfs_action = NULL;
620 mddev->sysfs_active = 0;
622 mutex_unlock(&mddev->reconfig_mutex);
624 /* As we've dropped the mutex we need a spinlock to
625 * make sure the thread doesn't disappear
627 spin_lock(&pers_lock);
628 md_wakeup_thread(mddev->thread);
629 spin_unlock(&pers_lock);
631 EXPORT_SYMBOL_GPL(mddev_unlock);
633 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
635 struct md_rdev *rdev;
637 rdev_for_each_rcu(rdev, mddev)
638 if (rdev->desc_nr == nr)
643 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
645 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
647 struct md_rdev *rdev;
649 rdev_for_each(rdev, mddev)
650 if (rdev->bdev->bd_dev == dev)
656 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
658 struct md_rdev *rdev;
660 rdev_for_each_rcu(rdev, mddev)
661 if (rdev->bdev->bd_dev == dev)
667 static struct md_personality *find_pers(int level, char *clevel)
669 struct md_personality *pers;
670 list_for_each_entry(pers, &pers_list, list) {
671 if (level != LEVEL_NONE && pers->level == level)
673 if (strcmp(pers->name, clevel)==0)
679 /* return the offset of the super block in 512byte sectors */
680 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
682 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
683 return MD_NEW_SIZE_SECTORS(num_sectors);
686 static int alloc_disk_sb(struct md_rdev *rdev)
688 rdev->sb_page = alloc_page(GFP_KERNEL);
689 if (!rdev->sb_page) {
690 printk(KERN_ALERT "md: out of memory.\n");
697 void md_rdev_clear(struct md_rdev *rdev)
700 put_page(rdev->sb_page);
702 rdev->sb_page = NULL;
707 put_page(rdev->bb_page);
708 rdev->bb_page = NULL;
710 kfree(rdev->badblocks.page);
711 rdev->badblocks.page = NULL;
713 EXPORT_SYMBOL_GPL(md_rdev_clear);
715 static void super_written(struct bio *bio)
717 struct md_rdev *rdev = bio->bi_private;
718 struct mddev *mddev = rdev->mddev;
721 printk("md: super_written gets error=%d\n", bio->bi_error);
722 md_error(mddev, rdev);
725 if (atomic_dec_and_test(&mddev->pending_writes))
726 wake_up(&mddev->sb_wait);
730 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
731 sector_t sector, int size, struct page *page)
733 /* write first size bytes of page to sector of rdev
734 * Increment mddev->pending_writes before returning
735 * and decrement it on completion, waking up sb_wait
736 * if zero is reached.
737 * If an error occurred, call md_error
739 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
741 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
742 bio->bi_iter.bi_sector = sector;
743 bio_add_page(bio, page, size, 0);
744 bio->bi_private = rdev;
745 bio->bi_end_io = super_written;
747 atomic_inc(&mddev->pending_writes);
748 submit_bio(WRITE_FLUSH_FUA, bio);
751 void md_super_wait(struct mddev *mddev)
753 /* wait for all superblock writes that were scheduled to complete */
754 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
757 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
758 struct page *page, int rw, bool metadata_op)
760 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
763 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
764 rdev->meta_bdev : rdev->bdev;
766 bio->bi_iter.bi_sector = sector + rdev->sb_start;
767 else if (rdev->mddev->reshape_position != MaxSector &&
768 (rdev->mddev->reshape_backwards ==
769 (sector >= rdev->mddev->reshape_position)))
770 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
772 bio->bi_iter.bi_sector = sector + rdev->data_offset;
773 bio_add_page(bio, page, size, 0);
774 submit_bio_wait(rw, bio);
776 ret = !bio->bi_error;
780 EXPORT_SYMBOL_GPL(sync_page_io);
782 static int read_disk_sb(struct md_rdev *rdev, int size)
784 char b[BDEVNAME_SIZE];
789 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
795 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
796 bdevname(rdev->bdev,b));
800 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
802 return sb1->set_uuid0 == sb2->set_uuid0 &&
803 sb1->set_uuid1 == sb2->set_uuid1 &&
804 sb1->set_uuid2 == sb2->set_uuid2 &&
805 sb1->set_uuid3 == sb2->set_uuid3;
808 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
811 mdp_super_t *tmp1, *tmp2;
813 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
814 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
816 if (!tmp1 || !tmp2) {
818 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
826 * nr_disks is not constant
831 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
838 static u32 md_csum_fold(u32 csum)
840 csum = (csum & 0xffff) + (csum >> 16);
841 return (csum & 0xffff) + (csum >> 16);
844 static unsigned int calc_sb_csum(mdp_super_t *sb)
847 u32 *sb32 = (u32*)sb;
849 unsigned int disk_csum, csum;
851 disk_csum = sb->sb_csum;
854 for (i = 0; i < MD_SB_BYTES/4 ; i++)
856 csum = (newcsum & 0xffffffff) + (newcsum>>32);
859 /* This used to use csum_partial, which was wrong for several
860 * reasons including that different results are returned on
861 * different architectures. It isn't critical that we get exactly
862 * the same return value as before (we always csum_fold before
863 * testing, and that removes any differences). However as we
864 * know that csum_partial always returned a 16bit value on
865 * alphas, do a fold to maximise conformity to previous behaviour.
867 sb->sb_csum = md_csum_fold(disk_csum);
869 sb->sb_csum = disk_csum;
875 * Handle superblock details.
876 * We want to be able to handle multiple superblock formats
877 * so we have a common interface to them all, and an array of
878 * different handlers.
879 * We rely on user-space to write the initial superblock, and support
880 * reading and updating of superblocks.
881 * Interface methods are:
882 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
883 * loads and validates a superblock on dev.
884 * if refdev != NULL, compare superblocks on both devices
886 * 0 - dev has a superblock that is compatible with refdev
887 * 1 - dev has a superblock that is compatible and newer than refdev
888 * so dev should be used as the refdev in future
889 * -EINVAL superblock incompatible or invalid
890 * -othererror e.g. -EIO
892 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
893 * Verify that dev is acceptable into mddev.
894 * The first time, mddev->raid_disks will be 0, and data from
895 * dev should be merged in. Subsequent calls check that dev
896 * is new enough. Return 0 or -EINVAL
898 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
899 * Update the superblock for rdev with data in mddev
900 * This does not write to disc.
906 struct module *owner;
907 int (*load_super)(struct md_rdev *rdev,
908 struct md_rdev *refdev,
910 int (*validate_super)(struct mddev *mddev,
911 struct md_rdev *rdev);
912 void (*sync_super)(struct mddev *mddev,
913 struct md_rdev *rdev);
914 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
915 sector_t num_sectors);
916 int (*allow_new_offset)(struct md_rdev *rdev,
917 unsigned long long new_offset);
921 * Check that the given mddev has no bitmap.
923 * This function is called from the run method of all personalities that do not
924 * support bitmaps. It prints an error message and returns non-zero if mddev
925 * has a bitmap. Otherwise, it returns 0.
928 int md_check_no_bitmap(struct mddev *mddev)
930 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
932 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
933 mdname(mddev), mddev->pers->name);
936 EXPORT_SYMBOL(md_check_no_bitmap);
939 * load_super for 0.90.0
941 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
943 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
948 * Calculate the position of the superblock (512byte sectors),
949 * it's at the end of the disk.
951 * It also happens to be a multiple of 4Kb.
953 rdev->sb_start = calc_dev_sboffset(rdev);
955 ret = read_disk_sb(rdev, MD_SB_BYTES);
960 bdevname(rdev->bdev, b);
961 sb = page_address(rdev->sb_page);
963 if (sb->md_magic != MD_SB_MAGIC) {
964 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
969 if (sb->major_version != 0 ||
970 sb->minor_version < 90 ||
971 sb->minor_version > 91) {
972 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
973 sb->major_version, sb->minor_version,
978 if (sb->raid_disks <= 0)
981 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
982 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
987 rdev->preferred_minor = sb->md_minor;
988 rdev->data_offset = 0;
989 rdev->new_data_offset = 0;
990 rdev->sb_size = MD_SB_BYTES;
991 rdev->badblocks.shift = -1;
993 if (sb->level == LEVEL_MULTIPATH)
996 rdev->desc_nr = sb->this_disk.number;
1002 mdp_super_t *refsb = page_address(refdev->sb_page);
1003 if (!uuid_equal(refsb, sb)) {
1004 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1005 b, bdevname(refdev->bdev,b2));
1008 if (!sb_equal(refsb, sb)) {
1009 printk(KERN_WARNING "md: %s has same UUID"
1010 " but different superblock to %s\n",
1011 b, bdevname(refdev->bdev, b2));
1015 ev2 = md_event(refsb);
1021 rdev->sectors = rdev->sb_start;
1022 /* Limit to 4TB as metadata cannot record more than that.
1023 * (not needed for Linear and RAID0 as metadata doesn't
1026 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1027 rdev->sectors = (2ULL << 32) - 2;
1029 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1030 /* "this cannot possibly happen" ... */
1038 * validate_super for 0.90.0
1040 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1043 mdp_super_t *sb = page_address(rdev->sb_page);
1044 __u64 ev1 = md_event(sb);
1046 rdev->raid_disk = -1;
1047 clear_bit(Faulty, &rdev->flags);
1048 clear_bit(In_sync, &rdev->flags);
1049 clear_bit(Bitmap_sync, &rdev->flags);
1050 clear_bit(WriteMostly, &rdev->flags);
1052 if (mddev->raid_disks == 0) {
1053 mddev->major_version = 0;
1054 mddev->minor_version = sb->minor_version;
1055 mddev->patch_version = sb->patch_version;
1056 mddev->external = 0;
1057 mddev->chunk_sectors = sb->chunk_size >> 9;
1058 mddev->ctime = sb->ctime;
1059 mddev->utime = sb->utime;
1060 mddev->level = sb->level;
1061 mddev->clevel[0] = 0;
1062 mddev->layout = sb->layout;
1063 mddev->raid_disks = sb->raid_disks;
1064 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1065 mddev->events = ev1;
1066 mddev->bitmap_info.offset = 0;
1067 mddev->bitmap_info.space = 0;
1068 /* bitmap can use 60 K after the 4K superblocks */
1069 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1070 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1071 mddev->reshape_backwards = 0;
1073 if (mddev->minor_version >= 91) {
1074 mddev->reshape_position = sb->reshape_position;
1075 mddev->delta_disks = sb->delta_disks;
1076 mddev->new_level = sb->new_level;
1077 mddev->new_layout = sb->new_layout;
1078 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1079 if (mddev->delta_disks < 0)
1080 mddev->reshape_backwards = 1;
1082 mddev->reshape_position = MaxSector;
1083 mddev->delta_disks = 0;
1084 mddev->new_level = mddev->level;
1085 mddev->new_layout = mddev->layout;
1086 mddev->new_chunk_sectors = mddev->chunk_sectors;
1089 if (sb->state & (1<<MD_SB_CLEAN))
1090 mddev->recovery_cp = MaxSector;
1092 if (sb->events_hi == sb->cp_events_hi &&
1093 sb->events_lo == sb->cp_events_lo) {
1094 mddev->recovery_cp = sb->recovery_cp;
1096 mddev->recovery_cp = 0;
1099 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1100 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1101 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1102 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1104 mddev->max_disks = MD_SB_DISKS;
1106 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1107 mddev->bitmap_info.file == NULL) {
1108 mddev->bitmap_info.offset =
1109 mddev->bitmap_info.default_offset;
1110 mddev->bitmap_info.space =
1111 mddev->bitmap_info.default_space;
1114 } else if (mddev->pers == NULL) {
1115 /* Insist on good event counter while assembling, except
1116 * for spares (which don't need an event count) */
1118 if (sb->disks[rdev->desc_nr].state & (
1119 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1120 if (ev1 < mddev->events)
1122 } else if (mddev->bitmap) {
1123 /* if adding to array with a bitmap, then we can accept an
1124 * older device ... but not too old.
1126 if (ev1 < mddev->bitmap->events_cleared)
1128 if (ev1 < mddev->events)
1129 set_bit(Bitmap_sync, &rdev->flags);
1131 if (ev1 < mddev->events)
1132 /* just a hot-add of a new device, leave raid_disk at -1 */
1136 if (mddev->level != LEVEL_MULTIPATH) {
1137 desc = sb->disks + rdev->desc_nr;
1139 if (desc->state & (1<<MD_DISK_FAULTY))
1140 set_bit(Faulty, &rdev->flags);
1141 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1142 desc->raid_disk < mddev->raid_disks */) {
1143 set_bit(In_sync, &rdev->flags);
1144 rdev->raid_disk = desc->raid_disk;
1145 rdev->saved_raid_disk = desc->raid_disk;
1146 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1147 /* active but not in sync implies recovery up to
1148 * reshape position. We don't know exactly where
1149 * that is, so set to zero for now */
1150 if (mddev->minor_version >= 91) {
1151 rdev->recovery_offset = 0;
1152 rdev->raid_disk = desc->raid_disk;
1155 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1156 set_bit(WriteMostly, &rdev->flags);
1157 } else /* MULTIPATH are always insync */
1158 set_bit(In_sync, &rdev->flags);
1163 * sync_super for 0.90.0
1165 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1168 struct md_rdev *rdev2;
1169 int next_spare = mddev->raid_disks;
1171 /* make rdev->sb match mddev data..
1174 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1175 * 3/ any empty disks < next_spare become removed
1177 * disks[0] gets initialised to REMOVED because
1178 * we cannot be sure from other fields if it has
1179 * been initialised or not.
1182 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1184 rdev->sb_size = MD_SB_BYTES;
1186 sb = page_address(rdev->sb_page);
1188 memset(sb, 0, sizeof(*sb));
1190 sb->md_magic = MD_SB_MAGIC;
1191 sb->major_version = mddev->major_version;
1192 sb->patch_version = mddev->patch_version;
1193 sb->gvalid_words = 0; /* ignored */
1194 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1195 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1196 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1197 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1199 sb->ctime = mddev->ctime;
1200 sb->level = mddev->level;
1201 sb->size = mddev->dev_sectors / 2;
1202 sb->raid_disks = mddev->raid_disks;
1203 sb->md_minor = mddev->md_minor;
1204 sb->not_persistent = 0;
1205 sb->utime = mddev->utime;
1207 sb->events_hi = (mddev->events>>32);
1208 sb->events_lo = (u32)mddev->events;
1210 if (mddev->reshape_position == MaxSector)
1211 sb->minor_version = 90;
1213 sb->minor_version = 91;
1214 sb->reshape_position = mddev->reshape_position;
1215 sb->new_level = mddev->new_level;
1216 sb->delta_disks = mddev->delta_disks;
1217 sb->new_layout = mddev->new_layout;
1218 sb->new_chunk = mddev->new_chunk_sectors << 9;
1220 mddev->minor_version = sb->minor_version;
1223 sb->recovery_cp = mddev->recovery_cp;
1224 sb->cp_events_hi = (mddev->events>>32);
1225 sb->cp_events_lo = (u32)mddev->events;
1226 if (mddev->recovery_cp == MaxSector)
1227 sb->state = (1<< MD_SB_CLEAN);
1229 sb->recovery_cp = 0;
1231 sb->layout = mddev->layout;
1232 sb->chunk_size = mddev->chunk_sectors << 9;
1234 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1235 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1237 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1238 rdev_for_each(rdev2, mddev) {
1241 int is_active = test_bit(In_sync, &rdev2->flags);
1243 if (rdev2->raid_disk >= 0 &&
1244 sb->minor_version >= 91)
1245 /* we have nowhere to store the recovery_offset,
1246 * but if it is not below the reshape_position,
1247 * we can piggy-back on that.
1250 if (rdev2->raid_disk < 0 ||
1251 test_bit(Faulty, &rdev2->flags))
1254 desc_nr = rdev2->raid_disk;
1256 desc_nr = next_spare++;
1257 rdev2->desc_nr = desc_nr;
1258 d = &sb->disks[rdev2->desc_nr];
1260 d->number = rdev2->desc_nr;
1261 d->major = MAJOR(rdev2->bdev->bd_dev);
1262 d->minor = MINOR(rdev2->bdev->bd_dev);
1264 d->raid_disk = rdev2->raid_disk;
1266 d->raid_disk = rdev2->desc_nr; /* compatibility */
1267 if (test_bit(Faulty, &rdev2->flags))
1268 d->state = (1<<MD_DISK_FAULTY);
1269 else if (is_active) {
1270 d->state = (1<<MD_DISK_ACTIVE);
1271 if (test_bit(In_sync, &rdev2->flags))
1272 d->state |= (1<<MD_DISK_SYNC);
1280 if (test_bit(WriteMostly, &rdev2->flags))
1281 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1283 /* now set the "removed" and "faulty" bits on any missing devices */
1284 for (i=0 ; i < mddev->raid_disks ; i++) {
1285 mdp_disk_t *d = &sb->disks[i];
1286 if (d->state == 0 && d->number == 0) {
1289 d->state = (1<<MD_DISK_REMOVED);
1290 d->state |= (1<<MD_DISK_FAULTY);
1294 sb->nr_disks = nr_disks;
1295 sb->active_disks = active;
1296 sb->working_disks = working;
1297 sb->failed_disks = failed;
1298 sb->spare_disks = spare;
1300 sb->this_disk = sb->disks[rdev->desc_nr];
1301 sb->sb_csum = calc_sb_csum(sb);
1305 * rdev_size_change for 0.90.0
1307 static unsigned long long
1308 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1310 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1311 return 0; /* component must fit device */
1312 if (rdev->mddev->bitmap_info.offset)
1313 return 0; /* can't move bitmap */
1314 rdev->sb_start = calc_dev_sboffset(rdev);
1315 if (!num_sectors || num_sectors > rdev->sb_start)
1316 num_sectors = rdev->sb_start;
1317 /* Limit to 4TB as metadata cannot record more than that.
1318 * 4TB == 2^32 KB, or 2*2^32 sectors.
1320 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1321 num_sectors = (2ULL << 32) - 2;
1322 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1324 md_super_wait(rdev->mddev);
1329 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1331 /* non-zero offset changes not possible with v0.90 */
1332 return new_offset == 0;
1336 * version 1 superblock
1339 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1343 unsigned long long newcsum;
1344 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1345 __le32 *isuper = (__le32*)sb;
1347 disk_csum = sb->sb_csum;
1350 for (; size >= 4; size -= 4)
1351 newcsum += le32_to_cpu(*isuper++);
1354 newcsum += le16_to_cpu(*(__le16*) isuper);
1356 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1357 sb->sb_csum = disk_csum;
1358 return cpu_to_le32(csum);
1361 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1363 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1365 struct mdp_superblock_1 *sb;
1369 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1373 * Calculate the position of the superblock in 512byte sectors.
1374 * It is always aligned to a 4K boundary and
1375 * depeding on minor_version, it can be:
1376 * 0: At least 8K, but less than 12K, from end of device
1377 * 1: At start of device
1378 * 2: 4K from start of device.
1380 switch(minor_version) {
1382 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1384 sb_start &= ~(sector_t)(4*2-1);
1395 rdev->sb_start = sb_start;
1397 /* superblock is rarely larger than 1K, but it can be larger,
1398 * and it is safe to read 4k, so we do that
1400 ret = read_disk_sb(rdev, 4096);
1401 if (ret) return ret;
1403 sb = page_address(rdev->sb_page);
1405 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1406 sb->major_version != cpu_to_le32(1) ||
1407 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1408 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1409 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1412 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1413 printk("md: invalid superblock checksum on %s\n",
1414 bdevname(rdev->bdev,b));
1417 if (le64_to_cpu(sb->data_size) < 10) {
1418 printk("md: data_size too small on %s\n",
1419 bdevname(rdev->bdev,b));
1424 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1425 /* Some padding is non-zero, might be a new feature */
1428 rdev->preferred_minor = 0xffff;
1429 rdev->data_offset = le64_to_cpu(sb->data_offset);
1430 rdev->new_data_offset = rdev->data_offset;
1431 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1432 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1433 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1434 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1436 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1437 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1438 if (rdev->sb_size & bmask)
1439 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1442 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1445 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1448 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1451 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1453 if (!rdev->bb_page) {
1454 rdev->bb_page = alloc_page(GFP_KERNEL);
1458 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1459 rdev->badblocks.count == 0) {
1460 /* need to load the bad block list.
1461 * Currently we limit it to one page.
1467 int sectors = le16_to_cpu(sb->bblog_size);
1468 if (sectors > (PAGE_SIZE / 512))
1470 offset = le32_to_cpu(sb->bblog_offset);
1473 bb_sector = (long long)offset;
1474 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1475 rdev->bb_page, READ, true))
1477 bbp = (u64 *)page_address(rdev->bb_page);
1478 rdev->badblocks.shift = sb->bblog_shift;
1479 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1480 u64 bb = le64_to_cpu(*bbp);
1481 int count = bb & (0x3ff);
1482 u64 sector = bb >> 10;
1483 sector <<= sb->bblog_shift;
1484 count <<= sb->bblog_shift;
1487 if (md_set_badblocks(&rdev->badblocks,
1488 sector, count, 1) == 0)
1491 } else if (sb->bblog_offset != 0)
1492 rdev->badblocks.shift = 0;
1498 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1500 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1501 sb->level != refsb->level ||
1502 sb->layout != refsb->layout ||
1503 sb->chunksize != refsb->chunksize) {
1504 printk(KERN_WARNING "md: %s has strangely different"
1505 " superblock to %s\n",
1506 bdevname(rdev->bdev,b),
1507 bdevname(refdev->bdev,b2));
1510 ev1 = le64_to_cpu(sb->events);
1511 ev2 = le64_to_cpu(refsb->events);
1518 if (minor_version) {
1519 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1520 sectors -= rdev->data_offset;
1522 sectors = rdev->sb_start;
1523 if (sectors < le64_to_cpu(sb->data_size))
1525 rdev->sectors = le64_to_cpu(sb->data_size);
1529 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1531 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1532 __u64 ev1 = le64_to_cpu(sb->events);
1534 rdev->raid_disk = -1;
1535 clear_bit(Faulty, &rdev->flags);
1536 clear_bit(In_sync, &rdev->flags);
1537 clear_bit(Bitmap_sync, &rdev->flags);
1538 clear_bit(WriteMostly, &rdev->flags);
1540 if (mddev->raid_disks == 0) {
1541 mddev->major_version = 1;
1542 mddev->patch_version = 0;
1543 mddev->external = 0;
1544 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1545 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1546 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1547 mddev->level = le32_to_cpu(sb->level);
1548 mddev->clevel[0] = 0;
1549 mddev->layout = le32_to_cpu(sb->layout);
1550 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1551 mddev->dev_sectors = le64_to_cpu(sb->size);
1552 mddev->events = ev1;
1553 mddev->bitmap_info.offset = 0;
1554 mddev->bitmap_info.space = 0;
1555 /* Default location for bitmap is 1K after superblock
1556 * using 3K - total of 4K
1558 mddev->bitmap_info.default_offset = 1024 >> 9;
1559 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1560 mddev->reshape_backwards = 0;
1562 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1563 memcpy(mddev->uuid, sb->set_uuid, 16);
1565 mddev->max_disks = (4096-256)/2;
1567 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1568 mddev->bitmap_info.file == NULL) {
1569 mddev->bitmap_info.offset =
1570 (__s32)le32_to_cpu(sb->bitmap_offset);
1571 /* Metadata doesn't record how much space is available.
1572 * For 1.0, we assume we can use up to the superblock
1573 * if before, else to 4K beyond superblock.
1574 * For others, assume no change is possible.
1576 if (mddev->minor_version > 0)
1577 mddev->bitmap_info.space = 0;
1578 else if (mddev->bitmap_info.offset > 0)
1579 mddev->bitmap_info.space =
1580 8 - mddev->bitmap_info.offset;
1582 mddev->bitmap_info.space =
1583 -mddev->bitmap_info.offset;
1586 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1587 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1588 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1589 mddev->new_level = le32_to_cpu(sb->new_level);
1590 mddev->new_layout = le32_to_cpu(sb->new_layout);
1591 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1592 if (mddev->delta_disks < 0 ||
1593 (mddev->delta_disks == 0 &&
1594 (le32_to_cpu(sb->feature_map)
1595 & MD_FEATURE_RESHAPE_BACKWARDS)))
1596 mddev->reshape_backwards = 1;
1598 mddev->reshape_position = MaxSector;
1599 mddev->delta_disks = 0;
1600 mddev->new_level = mddev->level;
1601 mddev->new_layout = mddev->layout;
1602 mddev->new_chunk_sectors = mddev->chunk_sectors;
1605 } else if (mddev->pers == NULL) {
1606 /* Insist of good event counter while assembling, except for
1607 * spares (which don't need an event count) */
1609 if (rdev->desc_nr >= 0 &&
1610 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1611 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1612 if (ev1 < mddev->events)
1614 } else if (mddev->bitmap) {
1615 /* If adding to array with a bitmap, then we can accept an
1616 * older device, but not too old.
1618 if (ev1 < mddev->bitmap->events_cleared)
1620 if (ev1 < mddev->events)
1621 set_bit(Bitmap_sync, &rdev->flags);
1623 if (ev1 < mddev->events)
1624 /* just a hot-add of a new device, leave raid_disk at -1 */
1627 if (mddev->level != LEVEL_MULTIPATH) {
1629 if (rdev->desc_nr < 0 ||
1630 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1634 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1636 case 0xffff: /* spare */
1638 case 0xfffe: /* faulty */
1639 set_bit(Faulty, &rdev->flags);
1642 rdev->saved_raid_disk = role;
1643 if ((le32_to_cpu(sb->feature_map) &
1644 MD_FEATURE_RECOVERY_OFFSET)) {
1645 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1646 if (!(le32_to_cpu(sb->feature_map) &
1647 MD_FEATURE_RECOVERY_BITMAP))
1648 rdev->saved_raid_disk = -1;
1650 set_bit(In_sync, &rdev->flags);
1651 rdev->raid_disk = role;
1654 if (sb->devflags & WriteMostly1)
1655 set_bit(WriteMostly, &rdev->flags);
1656 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1657 set_bit(Replacement, &rdev->flags);
1658 } else /* MULTIPATH are always insync */
1659 set_bit(In_sync, &rdev->flags);
1664 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1666 struct mdp_superblock_1 *sb;
1667 struct md_rdev *rdev2;
1669 /* make rdev->sb match mddev and rdev data. */
1671 sb = page_address(rdev->sb_page);
1673 sb->feature_map = 0;
1675 sb->recovery_offset = cpu_to_le64(0);
1676 memset(sb->pad3, 0, sizeof(sb->pad3));
1678 sb->utime = cpu_to_le64((__u64)mddev->utime);
1679 sb->events = cpu_to_le64(mddev->events);
1681 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1683 sb->resync_offset = cpu_to_le64(0);
1685 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1687 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1688 sb->size = cpu_to_le64(mddev->dev_sectors);
1689 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1690 sb->level = cpu_to_le32(mddev->level);
1691 sb->layout = cpu_to_le32(mddev->layout);
1693 if (test_bit(WriteMostly, &rdev->flags))
1694 sb->devflags |= WriteMostly1;
1696 sb->devflags &= ~WriteMostly1;
1697 sb->data_offset = cpu_to_le64(rdev->data_offset);
1698 sb->data_size = cpu_to_le64(rdev->sectors);
1700 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1701 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1702 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1705 if (rdev->raid_disk >= 0 &&
1706 !test_bit(In_sync, &rdev->flags)) {
1708 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1709 sb->recovery_offset =
1710 cpu_to_le64(rdev->recovery_offset);
1711 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1713 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1715 if (test_bit(Replacement, &rdev->flags))
1717 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1719 if (mddev->reshape_position != MaxSector) {
1720 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1721 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1722 sb->new_layout = cpu_to_le32(mddev->new_layout);
1723 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1724 sb->new_level = cpu_to_le32(mddev->new_level);
1725 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1726 if (mddev->delta_disks == 0 &&
1727 mddev->reshape_backwards)
1729 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1730 if (rdev->new_data_offset != rdev->data_offset) {
1732 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1733 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1734 - rdev->data_offset));
1738 if (rdev->badblocks.count == 0)
1739 /* Nothing to do for bad blocks*/ ;
1740 else if (sb->bblog_offset == 0)
1741 /* Cannot record bad blocks on this device */
1742 md_error(mddev, rdev);
1744 struct badblocks *bb = &rdev->badblocks;
1745 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1747 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1752 seq = read_seqbegin(&bb->lock);
1754 memset(bbp, 0xff, PAGE_SIZE);
1756 for (i = 0 ; i < bb->count ; i++) {
1757 u64 internal_bb = p[i];
1758 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1759 | BB_LEN(internal_bb));
1760 bbp[i] = cpu_to_le64(store_bb);
1763 if (read_seqretry(&bb->lock, seq))
1766 bb->sector = (rdev->sb_start +
1767 (int)le32_to_cpu(sb->bblog_offset));
1768 bb->size = le16_to_cpu(sb->bblog_size);
1773 rdev_for_each(rdev2, mddev)
1774 if (rdev2->desc_nr+1 > max_dev)
1775 max_dev = rdev2->desc_nr+1;
1777 if (max_dev > le32_to_cpu(sb->max_dev)) {
1779 sb->max_dev = cpu_to_le32(max_dev);
1780 rdev->sb_size = max_dev * 2 + 256;
1781 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1782 if (rdev->sb_size & bmask)
1783 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1785 max_dev = le32_to_cpu(sb->max_dev);
1787 for (i=0; i<max_dev;i++)
1788 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1790 rdev_for_each(rdev2, mddev) {
1792 if (test_bit(Faulty, &rdev2->flags))
1793 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1794 else if (test_bit(In_sync, &rdev2->flags))
1795 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1796 else if (rdev2->raid_disk >= 0)
1797 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1799 sb->dev_roles[i] = cpu_to_le16(0xffff);
1802 sb->sb_csum = calc_sb_1_csum(sb);
1805 static unsigned long long
1806 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1808 struct mdp_superblock_1 *sb;
1809 sector_t max_sectors;
1810 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1811 return 0; /* component must fit device */
1812 if (rdev->data_offset != rdev->new_data_offset)
1813 return 0; /* too confusing */
1814 if (rdev->sb_start < rdev->data_offset) {
1815 /* minor versions 1 and 2; superblock before data */
1816 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1817 max_sectors -= rdev->data_offset;
1818 if (!num_sectors || num_sectors > max_sectors)
1819 num_sectors = max_sectors;
1820 } else if (rdev->mddev->bitmap_info.offset) {
1821 /* minor version 0 with bitmap we can't move */
1824 /* minor version 0; superblock after data */
1826 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1827 sb_start &= ~(sector_t)(4*2 - 1);
1828 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1829 if (!num_sectors || num_sectors > max_sectors)
1830 num_sectors = max_sectors;
1831 rdev->sb_start = sb_start;
1833 sb = page_address(rdev->sb_page);
1834 sb->data_size = cpu_to_le64(num_sectors);
1835 sb->super_offset = rdev->sb_start;
1836 sb->sb_csum = calc_sb_1_csum(sb);
1837 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1839 md_super_wait(rdev->mddev);
1845 super_1_allow_new_offset(struct md_rdev *rdev,
1846 unsigned long long new_offset)
1848 /* All necessary checks on new >= old have been done */
1849 struct bitmap *bitmap;
1850 if (new_offset >= rdev->data_offset)
1853 /* with 1.0 metadata, there is no metadata to tread on
1854 * so we can always move back */
1855 if (rdev->mddev->minor_version == 0)
1858 /* otherwise we must be sure not to step on
1859 * any metadata, so stay:
1860 * 36K beyond start of superblock
1861 * beyond end of badblocks
1862 * beyond write-intent bitmap
1864 if (rdev->sb_start + (32+4)*2 > new_offset)
1866 bitmap = rdev->mddev->bitmap;
1867 if (bitmap && !rdev->mddev->bitmap_info.file &&
1868 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1869 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1871 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1877 static struct super_type super_types[] = {
1880 .owner = THIS_MODULE,
1881 .load_super = super_90_load,
1882 .validate_super = super_90_validate,
1883 .sync_super = super_90_sync,
1884 .rdev_size_change = super_90_rdev_size_change,
1885 .allow_new_offset = super_90_allow_new_offset,
1889 .owner = THIS_MODULE,
1890 .load_super = super_1_load,
1891 .validate_super = super_1_validate,
1892 .sync_super = super_1_sync,
1893 .rdev_size_change = super_1_rdev_size_change,
1894 .allow_new_offset = super_1_allow_new_offset,
1898 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1900 if (mddev->sync_super) {
1901 mddev->sync_super(mddev, rdev);
1905 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1907 super_types[mddev->major_version].sync_super(mddev, rdev);
1910 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1912 struct md_rdev *rdev, *rdev2;
1915 rdev_for_each_rcu(rdev, mddev1)
1916 rdev_for_each_rcu(rdev2, mddev2)
1917 if (rdev->bdev->bd_contains ==
1918 rdev2->bdev->bd_contains) {
1926 static LIST_HEAD(pending_raid_disks);
1929 * Try to register data integrity profile for an mddev
1931 * This is called when an array is started and after a disk has been kicked
1932 * from the array. It only succeeds if all working and active component devices
1933 * are integrity capable with matching profiles.
1935 int md_integrity_register(struct mddev *mddev)
1937 struct md_rdev *rdev, *reference = NULL;
1939 if (list_empty(&mddev->disks))
1940 return 0; /* nothing to do */
1941 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1942 return 0; /* shouldn't register, or already is */
1943 rdev_for_each(rdev, mddev) {
1944 /* skip spares and non-functional disks */
1945 if (test_bit(Faulty, &rdev->flags))
1947 if (rdev->raid_disk < 0)
1950 /* Use the first rdev as the reference */
1954 /* does this rdev's profile match the reference profile? */
1955 if (blk_integrity_compare(reference->bdev->bd_disk,
1956 rdev->bdev->bd_disk) < 0)
1959 if (!reference || !bdev_get_integrity(reference->bdev))
1962 * All component devices are integrity capable and have matching
1963 * profiles, register the common profile for the md device.
1965 blk_integrity_register(mddev->gendisk,
1966 bdev_get_integrity(reference->bdev));
1968 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1969 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1970 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1976 EXPORT_SYMBOL(md_integrity_register);
1978 /* Disable data integrity if non-capable/non-matching disk is being added */
1979 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
1981 struct blk_integrity *bi_rdev;
1982 struct blk_integrity *bi_mddev;
1984 if (!mddev->gendisk)
1987 bi_rdev = bdev_get_integrity(rdev->bdev);
1988 bi_mddev = blk_get_integrity(mddev->gendisk);
1990 if (!bi_mddev) /* nothing to do */
1992 if (rdev->raid_disk < 0) /* skip spares */
1994 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1995 rdev->bdev->bd_disk) >= 0)
1997 WARN_ON_ONCE(!mddev->suspended);
1998 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1999 blk_integrity_unregister(mddev->gendisk);
2001 EXPORT_SYMBOL(md_integrity_add_rdev);
2003 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2005 char b[BDEVNAME_SIZE];
2009 /* prevent duplicates */
2010 if (find_rdev(mddev, rdev->bdev->bd_dev))
2013 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2014 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2015 rdev->sectors < mddev->dev_sectors)) {
2017 /* Cannot change size, so fail
2018 * If mddev->level <= 0, then we don't care
2019 * about aligning sizes (e.g. linear)
2021 if (mddev->level > 0)
2024 mddev->dev_sectors = rdev->sectors;
2027 /* Verify rdev->desc_nr is unique.
2028 * If it is -1, assign a free number, else
2029 * check number is not in use
2032 if (rdev->desc_nr < 0) {
2035 choice = mddev->raid_disks;
2036 while (md_find_rdev_nr_rcu(mddev, choice))
2038 rdev->desc_nr = choice;
2040 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2046 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2047 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2048 mdname(mddev), mddev->max_disks);
2051 bdevname(rdev->bdev,b);
2052 strreplace(b, '/', '!');
2054 rdev->mddev = mddev;
2055 printk(KERN_INFO "md: bind<%s>\n", b);
2057 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2060 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2061 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2062 /* failure here is OK */;
2063 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2065 list_add_rcu(&rdev->same_set, &mddev->disks);
2066 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2068 /* May as well allow recovery to be retried once */
2069 mddev->recovery_disabled++;
2074 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2079 static void md_delayed_delete(struct work_struct *ws)
2081 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2082 kobject_del(&rdev->kobj);
2083 kobject_put(&rdev->kobj);
2086 static void unbind_rdev_from_array(struct md_rdev *rdev)
2088 char b[BDEVNAME_SIZE];
2090 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2091 list_del_rcu(&rdev->same_set);
2092 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2094 sysfs_remove_link(&rdev->kobj, "block");
2095 sysfs_put(rdev->sysfs_state);
2096 rdev->sysfs_state = NULL;
2097 rdev->badblocks.count = 0;
2098 /* We need to delay this, otherwise we can deadlock when
2099 * writing to 'remove' to "dev/state". We also need
2100 * to delay it due to rcu usage.
2103 INIT_WORK(&rdev->del_work, md_delayed_delete);
2104 kobject_get(&rdev->kobj);
2105 queue_work(md_misc_wq, &rdev->del_work);
2109 * prevent the device from being mounted, repartitioned or
2110 * otherwise reused by a RAID array (or any other kernel
2111 * subsystem), by bd_claiming the device.
2113 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2116 struct block_device *bdev;
2117 char b[BDEVNAME_SIZE];
2119 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2120 shared ? (struct md_rdev *)lock_rdev : rdev);
2122 printk(KERN_ERR "md: could not open %s.\n",
2123 __bdevname(dev, b));
2124 return PTR_ERR(bdev);
2130 static void unlock_rdev(struct md_rdev *rdev)
2132 struct block_device *bdev = rdev->bdev;
2134 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2137 void md_autodetect_dev(dev_t dev);
2139 static void export_rdev(struct md_rdev *rdev)
2141 char b[BDEVNAME_SIZE];
2143 printk(KERN_INFO "md: export_rdev(%s)\n",
2144 bdevname(rdev->bdev,b));
2145 md_rdev_clear(rdev);
2147 if (test_bit(AutoDetected, &rdev->flags))
2148 md_autodetect_dev(rdev->bdev->bd_dev);
2151 kobject_put(&rdev->kobj);
2154 void md_kick_rdev_from_array(struct md_rdev *rdev)
2156 unbind_rdev_from_array(rdev);
2159 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2161 static void export_array(struct mddev *mddev)
2163 struct md_rdev *rdev;
2165 while (!list_empty(&mddev->disks)) {
2166 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2168 md_kick_rdev_from_array(rdev);
2170 mddev->raid_disks = 0;
2171 mddev->major_version = 0;
2174 static void sync_sbs(struct mddev *mddev, int nospares)
2176 /* Update each superblock (in-memory image), but
2177 * if we are allowed to, skip spares which already
2178 * have the right event counter, or have one earlier
2179 * (which would mean they aren't being marked as dirty
2180 * with the rest of the array)
2182 struct md_rdev *rdev;
2183 rdev_for_each(rdev, mddev) {
2184 if (rdev->sb_events == mddev->events ||
2186 rdev->raid_disk < 0 &&
2187 rdev->sb_events+1 == mddev->events)) {
2188 /* Don't update this superblock */
2189 rdev->sb_loaded = 2;
2191 sync_super(mddev, rdev);
2192 rdev->sb_loaded = 1;
2197 void md_update_sb(struct mddev *mddev, int force_change)
2199 struct md_rdev *rdev;
2202 int any_badblocks_changed = 0;
2206 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2210 /* First make sure individual recovery_offsets are correct */
2211 rdev_for_each(rdev, mddev) {
2212 if (rdev->raid_disk >= 0 &&
2213 mddev->delta_disks >= 0 &&
2214 !test_bit(In_sync, &rdev->flags) &&
2215 mddev->curr_resync_completed > rdev->recovery_offset)
2216 rdev->recovery_offset = mddev->curr_resync_completed;
2219 if (!mddev->persistent) {
2220 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2221 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2222 if (!mddev->external) {
2223 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2224 rdev_for_each(rdev, mddev) {
2225 if (rdev->badblocks.changed) {
2226 rdev->badblocks.changed = 0;
2227 md_ack_all_badblocks(&rdev->badblocks);
2228 md_error(mddev, rdev);
2230 clear_bit(Blocked, &rdev->flags);
2231 clear_bit(BlockedBadBlocks, &rdev->flags);
2232 wake_up(&rdev->blocked_wait);
2235 wake_up(&mddev->sb_wait);
2239 spin_lock(&mddev->lock);
2241 mddev->utime = get_seconds();
2243 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2245 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2246 /* just a clean<-> dirty transition, possibly leave spares alone,
2247 * though if events isn't the right even/odd, we will have to do
2253 if (mddev->degraded)
2254 /* If the array is degraded, then skipping spares is both
2255 * dangerous and fairly pointless.
2256 * Dangerous because a device that was removed from the array
2257 * might have a event_count that still looks up-to-date,
2258 * so it can be re-added without a resync.
2259 * Pointless because if there are any spares to skip,
2260 * then a recovery will happen and soon that array won't
2261 * be degraded any more and the spare can go back to sleep then.
2265 sync_req = mddev->in_sync;
2267 /* If this is just a dirty<->clean transition, and the array is clean
2268 * and 'events' is odd, we can roll back to the previous clean state */
2270 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2271 && mddev->can_decrease_events
2272 && mddev->events != 1) {
2274 mddev->can_decrease_events = 0;
2276 /* otherwise we have to go forward and ... */
2278 mddev->can_decrease_events = nospares;
2282 * This 64-bit counter should never wrap.
2283 * Either we are in around ~1 trillion A.C., assuming
2284 * 1 reboot per second, or we have a bug...
2286 WARN_ON(mddev->events == 0);
2288 rdev_for_each(rdev, mddev) {
2289 if (rdev->badblocks.changed)
2290 any_badblocks_changed++;
2291 if (test_bit(Faulty, &rdev->flags))
2292 set_bit(FaultRecorded, &rdev->flags);
2295 sync_sbs(mddev, nospares);
2296 spin_unlock(&mddev->lock);
2298 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2299 mdname(mddev), mddev->in_sync);
2301 bitmap_update_sb(mddev->bitmap);
2302 rdev_for_each(rdev, mddev) {
2303 char b[BDEVNAME_SIZE];
2305 if (rdev->sb_loaded != 1)
2306 continue; /* no noise on spare devices */
2308 if (!test_bit(Faulty, &rdev->flags)) {
2309 md_super_write(mddev,rdev,
2310 rdev->sb_start, rdev->sb_size,
2312 pr_debug("md: (write) %s's sb offset: %llu\n",
2313 bdevname(rdev->bdev, b),
2314 (unsigned long long)rdev->sb_start);
2315 rdev->sb_events = mddev->events;
2316 if (rdev->badblocks.size) {
2317 md_super_write(mddev, rdev,
2318 rdev->badblocks.sector,
2319 rdev->badblocks.size << 9,
2321 rdev->badblocks.size = 0;
2325 pr_debug("md: %s (skipping faulty)\n",
2326 bdevname(rdev->bdev, b));
2328 if (mddev->level == LEVEL_MULTIPATH)
2329 /* only need to write one superblock... */
2332 md_super_wait(mddev);
2333 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2335 spin_lock(&mddev->lock);
2336 if (mddev->in_sync != sync_req ||
2337 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2338 /* have to write it out again */
2339 spin_unlock(&mddev->lock);
2342 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2343 spin_unlock(&mddev->lock);
2344 wake_up(&mddev->sb_wait);
2345 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2346 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2348 rdev_for_each(rdev, mddev) {
2349 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2350 clear_bit(Blocked, &rdev->flags);
2352 if (any_badblocks_changed)
2353 md_ack_all_badblocks(&rdev->badblocks);
2354 clear_bit(BlockedBadBlocks, &rdev->flags);
2355 wake_up(&rdev->blocked_wait);
2358 EXPORT_SYMBOL(md_update_sb);
2360 static int add_bound_rdev(struct md_rdev *rdev)
2362 struct mddev *mddev = rdev->mddev;
2365 if (!mddev->pers->hot_remove_disk) {
2366 /* If there is hot_add_disk but no hot_remove_disk
2367 * then added disks for geometry changes,
2368 * and should be added immediately.
2370 super_types[mddev->major_version].
2371 validate_super(mddev, rdev);
2372 err = mddev->pers->hot_add_disk(mddev, rdev);
2374 unbind_rdev_from_array(rdev);
2379 sysfs_notify_dirent_safe(rdev->sysfs_state);
2381 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2382 if (mddev->degraded)
2383 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2384 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2385 md_new_event(mddev);
2386 md_wakeup_thread(mddev->thread);
2390 /* words written to sysfs files may, or may not, be \n terminated.
2391 * We want to accept with case. For this we use cmd_match.
2393 static int cmd_match(const char *cmd, const char *str)
2395 /* See if cmd, written into a sysfs file, matches
2396 * str. They must either be the same, or cmd can
2397 * have a trailing newline
2399 while (*cmd && *str && *cmd == *str) {
2410 struct rdev_sysfs_entry {
2411 struct attribute attr;
2412 ssize_t (*show)(struct md_rdev *, char *);
2413 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2417 state_show(struct md_rdev *rdev, char *page)
2421 unsigned long flags = ACCESS_ONCE(rdev->flags);
2423 if (test_bit(Faulty, &flags) ||
2424 rdev->badblocks.unacked_exist) {
2425 len+= sprintf(page+len, "%sfaulty",sep);
2428 if (test_bit(In_sync, &flags)) {
2429 len += sprintf(page+len, "%sin_sync",sep);
2432 if (test_bit(WriteMostly, &flags)) {
2433 len += sprintf(page+len, "%swrite_mostly",sep);
2436 if (test_bit(Blocked, &flags) ||
2437 (rdev->badblocks.unacked_exist
2438 && !test_bit(Faulty, &flags))) {
2439 len += sprintf(page+len, "%sblocked", sep);
2442 if (!test_bit(Faulty, &flags) &&
2443 !test_bit(In_sync, &flags)) {
2444 len += sprintf(page+len, "%sspare", sep);
2447 if (test_bit(WriteErrorSeen, &flags)) {
2448 len += sprintf(page+len, "%swrite_error", sep);
2451 if (test_bit(WantReplacement, &flags)) {
2452 len += sprintf(page+len, "%swant_replacement", sep);
2455 if (test_bit(Replacement, &flags)) {
2456 len += sprintf(page+len, "%sreplacement", sep);
2460 return len+sprintf(page+len, "\n");
2464 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2467 * faulty - simulates an error
2468 * remove - disconnects the device
2469 * writemostly - sets write_mostly
2470 * -writemostly - clears write_mostly
2471 * blocked - sets the Blocked flags
2472 * -blocked - clears the Blocked and possibly simulates an error
2473 * insync - sets Insync providing device isn't active
2474 * -insync - clear Insync for a device with a slot assigned,
2475 * so that it gets rebuilt based on bitmap
2476 * write_error - sets WriteErrorSeen
2477 * -write_error - clears WriteErrorSeen
2480 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2481 md_error(rdev->mddev, rdev);
2482 if (test_bit(Faulty, &rdev->flags))
2486 } else if (cmd_match(buf, "remove")) {
2487 if (rdev->raid_disk >= 0)
2490 struct mddev *mddev = rdev->mddev;
2491 if (mddev_is_clustered(mddev))
2492 md_cluster_ops->remove_disk(mddev, rdev);
2493 md_kick_rdev_from_array(rdev);
2494 if (mddev_is_clustered(mddev))
2495 md_cluster_ops->metadata_update_start(mddev);
2497 md_update_sb(mddev, 1);
2498 md_new_event(mddev);
2499 if (mddev_is_clustered(mddev))
2500 md_cluster_ops->metadata_update_finish(mddev);
2503 } else if (cmd_match(buf, "writemostly")) {
2504 set_bit(WriteMostly, &rdev->flags);
2506 } else if (cmd_match(buf, "-writemostly")) {
2507 clear_bit(WriteMostly, &rdev->flags);
2509 } else if (cmd_match(buf, "blocked")) {
2510 set_bit(Blocked, &rdev->flags);
2512 } else if (cmd_match(buf, "-blocked")) {
2513 if (!test_bit(Faulty, &rdev->flags) &&
2514 rdev->badblocks.unacked_exist) {
2515 /* metadata handler doesn't understand badblocks,
2516 * so we need to fail the device
2518 md_error(rdev->mddev, rdev);
2520 clear_bit(Blocked, &rdev->flags);
2521 clear_bit(BlockedBadBlocks, &rdev->flags);
2522 wake_up(&rdev->blocked_wait);
2523 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2524 md_wakeup_thread(rdev->mddev->thread);
2527 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2528 set_bit(In_sync, &rdev->flags);
2530 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2531 if (rdev->mddev->pers == NULL) {
2532 clear_bit(In_sync, &rdev->flags);
2533 rdev->saved_raid_disk = rdev->raid_disk;
2534 rdev->raid_disk = -1;
2537 } else if (cmd_match(buf, "write_error")) {
2538 set_bit(WriteErrorSeen, &rdev->flags);
2540 } else if (cmd_match(buf, "-write_error")) {
2541 clear_bit(WriteErrorSeen, &rdev->flags);
2543 } else if (cmd_match(buf, "want_replacement")) {
2544 /* Any non-spare device that is not a replacement can
2545 * become want_replacement at any time, but we then need to
2546 * check if recovery is needed.
2548 if (rdev->raid_disk >= 0 &&
2549 !test_bit(Replacement, &rdev->flags))
2550 set_bit(WantReplacement, &rdev->flags);
2551 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2552 md_wakeup_thread(rdev->mddev->thread);
2554 } else if (cmd_match(buf, "-want_replacement")) {
2555 /* Clearing 'want_replacement' is always allowed.
2556 * Once replacements starts it is too late though.
2559 clear_bit(WantReplacement, &rdev->flags);
2560 } else if (cmd_match(buf, "replacement")) {
2561 /* Can only set a device as a replacement when array has not
2562 * yet been started. Once running, replacement is automatic
2563 * from spares, or by assigning 'slot'.
2565 if (rdev->mddev->pers)
2568 set_bit(Replacement, &rdev->flags);
2571 } else if (cmd_match(buf, "-replacement")) {
2572 /* Similarly, can only clear Replacement before start */
2573 if (rdev->mddev->pers)
2576 clear_bit(Replacement, &rdev->flags);
2579 } else if (cmd_match(buf, "re-add")) {
2580 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2581 /* clear_bit is performed _after_ all the devices
2582 * have their local Faulty bit cleared. If any writes
2583 * happen in the meantime in the local node, they
2584 * will land in the local bitmap, which will be synced
2585 * by this node eventually
2587 if (!mddev_is_clustered(rdev->mddev) ||
2588 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2589 clear_bit(Faulty, &rdev->flags);
2590 err = add_bound_rdev(rdev);
2596 sysfs_notify_dirent_safe(rdev->sysfs_state);
2597 return err ? err : len;
2599 static struct rdev_sysfs_entry rdev_state =
2600 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2603 errors_show(struct md_rdev *rdev, char *page)
2605 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2609 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2614 rv = kstrtouint(buf, 10, &n);
2617 atomic_set(&rdev->corrected_errors, n);
2620 static struct rdev_sysfs_entry rdev_errors =
2621 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2624 slot_show(struct md_rdev *rdev, char *page)
2626 if (rdev->raid_disk < 0)
2627 return sprintf(page, "none\n");
2629 return sprintf(page, "%d\n", rdev->raid_disk);
2633 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2638 if (strncmp(buf, "none", 4)==0)
2641 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2645 if (rdev->mddev->pers && slot == -1) {
2646 /* Setting 'slot' on an active array requires also
2647 * updating the 'rd%d' link, and communicating
2648 * with the personality with ->hot_*_disk.
2649 * For now we only support removing
2650 * failed/spare devices. This normally happens automatically,
2651 * but not when the metadata is externally managed.
2653 if (rdev->raid_disk == -1)
2655 /* personality does all needed checks */
2656 if (rdev->mddev->pers->hot_remove_disk == NULL)
2658 clear_bit(Blocked, &rdev->flags);
2659 remove_and_add_spares(rdev->mddev, rdev);
2660 if (rdev->raid_disk >= 0)
2662 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2663 md_wakeup_thread(rdev->mddev->thread);
2664 } else if (rdev->mddev->pers) {
2665 /* Activating a spare .. or possibly reactivating
2666 * if we ever get bitmaps working here.
2669 if (rdev->raid_disk != -1)
2672 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2675 if (rdev->mddev->pers->hot_add_disk == NULL)
2678 if (slot >= rdev->mddev->raid_disks &&
2679 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2682 rdev->raid_disk = slot;
2683 if (test_bit(In_sync, &rdev->flags))
2684 rdev->saved_raid_disk = slot;
2686 rdev->saved_raid_disk = -1;
2687 clear_bit(In_sync, &rdev->flags);
2688 clear_bit(Bitmap_sync, &rdev->flags);
2689 err = rdev->mddev->pers->
2690 hot_add_disk(rdev->mddev, rdev);
2692 rdev->raid_disk = -1;
2695 sysfs_notify_dirent_safe(rdev->sysfs_state);
2696 if (sysfs_link_rdev(rdev->mddev, rdev))
2697 /* failure here is OK */;
2698 /* don't wakeup anyone, leave that to userspace. */
2700 if (slot >= rdev->mddev->raid_disks &&
2701 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2703 rdev->raid_disk = slot;
2704 /* assume it is working */
2705 clear_bit(Faulty, &rdev->flags);
2706 clear_bit(WriteMostly, &rdev->flags);
2707 set_bit(In_sync, &rdev->flags);
2708 sysfs_notify_dirent_safe(rdev->sysfs_state);
2713 static struct rdev_sysfs_entry rdev_slot =
2714 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2717 offset_show(struct md_rdev *rdev, char *page)
2719 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2723 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2725 unsigned long long offset;
2726 if (kstrtoull(buf, 10, &offset) < 0)
2728 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2730 if (rdev->sectors && rdev->mddev->external)
2731 /* Must set offset before size, so overlap checks
2734 rdev->data_offset = offset;
2735 rdev->new_data_offset = offset;
2739 static struct rdev_sysfs_entry rdev_offset =
2740 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2742 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2744 return sprintf(page, "%llu\n",
2745 (unsigned long long)rdev->new_data_offset);
2748 static ssize_t new_offset_store(struct md_rdev *rdev,
2749 const char *buf, size_t len)
2751 unsigned long long new_offset;
2752 struct mddev *mddev = rdev->mddev;
2754 if (kstrtoull(buf, 10, &new_offset) < 0)
2757 if (mddev->sync_thread ||
2758 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2760 if (new_offset == rdev->data_offset)
2761 /* reset is always permitted */
2763 else if (new_offset > rdev->data_offset) {
2764 /* must not push array size beyond rdev_sectors */
2765 if (new_offset - rdev->data_offset
2766 + mddev->dev_sectors > rdev->sectors)
2769 /* Metadata worries about other space details. */
2771 /* decreasing the offset is inconsistent with a backwards
2774 if (new_offset < rdev->data_offset &&
2775 mddev->reshape_backwards)
2777 /* Increasing offset is inconsistent with forwards
2778 * reshape. reshape_direction should be set to
2779 * 'backwards' first.
2781 if (new_offset > rdev->data_offset &&
2782 !mddev->reshape_backwards)
2785 if (mddev->pers && mddev->persistent &&
2786 !super_types[mddev->major_version]
2787 .allow_new_offset(rdev, new_offset))
2789 rdev->new_data_offset = new_offset;
2790 if (new_offset > rdev->data_offset)
2791 mddev->reshape_backwards = 1;
2792 else if (new_offset < rdev->data_offset)
2793 mddev->reshape_backwards = 0;
2797 static struct rdev_sysfs_entry rdev_new_offset =
2798 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2801 rdev_size_show(struct md_rdev *rdev, char *page)
2803 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2806 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2808 /* check if two start/length pairs overlap */
2816 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2818 unsigned long long blocks;
2821 if (kstrtoull(buf, 10, &blocks) < 0)
2824 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2825 return -EINVAL; /* sector conversion overflow */
2828 if (new != blocks * 2)
2829 return -EINVAL; /* unsigned long long to sector_t overflow */
2836 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2838 struct mddev *my_mddev = rdev->mddev;
2839 sector_t oldsectors = rdev->sectors;
2842 if (strict_blocks_to_sectors(buf, §ors) < 0)
2844 if (rdev->data_offset != rdev->new_data_offset)
2845 return -EINVAL; /* too confusing */
2846 if (my_mddev->pers && rdev->raid_disk >= 0) {
2847 if (my_mddev->persistent) {
2848 sectors = super_types[my_mddev->major_version].
2849 rdev_size_change(rdev, sectors);
2852 } else if (!sectors)
2853 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2855 if (!my_mddev->pers->resize)
2856 /* Cannot change size for RAID0 or Linear etc */
2859 if (sectors < my_mddev->dev_sectors)
2860 return -EINVAL; /* component must fit device */
2862 rdev->sectors = sectors;
2863 if (sectors > oldsectors && my_mddev->external) {
2864 /* Need to check that all other rdevs with the same
2865 * ->bdev do not overlap. 'rcu' is sufficient to walk
2866 * the rdev lists safely.
2867 * This check does not provide a hard guarantee, it
2868 * just helps avoid dangerous mistakes.
2870 struct mddev *mddev;
2872 struct list_head *tmp;
2875 for_each_mddev(mddev, tmp) {
2876 struct md_rdev *rdev2;
2878 rdev_for_each(rdev2, mddev)
2879 if (rdev->bdev == rdev2->bdev &&
2881 overlaps(rdev->data_offset, rdev->sectors,
2894 /* Someone else could have slipped in a size
2895 * change here, but doing so is just silly.
2896 * We put oldsectors back because we *know* it is
2897 * safe, and trust userspace not to race with
2900 rdev->sectors = oldsectors;
2907 static struct rdev_sysfs_entry rdev_size =
2908 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2910 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
2912 unsigned long long recovery_start = rdev->recovery_offset;
2914 if (test_bit(In_sync, &rdev->flags) ||
2915 recovery_start == MaxSector)
2916 return sprintf(page, "none\n");
2918 return sprintf(page, "%llu\n", recovery_start);
2921 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
2923 unsigned long long recovery_start;
2925 if (cmd_match(buf, "none"))
2926 recovery_start = MaxSector;
2927 else if (kstrtoull(buf, 10, &recovery_start))
2930 if (rdev->mddev->pers &&
2931 rdev->raid_disk >= 0)
2934 rdev->recovery_offset = recovery_start;
2935 if (recovery_start == MaxSector)
2936 set_bit(In_sync, &rdev->flags);
2938 clear_bit(In_sync, &rdev->flags);
2942 static struct rdev_sysfs_entry rdev_recovery_start =
2943 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2946 badblocks_show(struct badblocks *bb, char *page, int unack);
2948 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
2950 static ssize_t bb_show(struct md_rdev *rdev, char *page)
2952 return badblocks_show(&rdev->badblocks, page, 0);
2954 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
2956 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
2957 /* Maybe that ack was all we needed */
2958 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
2959 wake_up(&rdev->blocked_wait);
2962 static struct rdev_sysfs_entry rdev_bad_blocks =
2963 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
2965 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
2967 return badblocks_show(&rdev->badblocks, page, 1);
2969 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
2971 return badblocks_store(&rdev->badblocks, page, len, 1);
2973 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
2974 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
2976 static struct attribute *rdev_default_attrs[] = {
2981 &rdev_new_offset.attr,
2983 &rdev_recovery_start.attr,
2984 &rdev_bad_blocks.attr,
2985 &rdev_unack_bad_blocks.attr,
2989 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2991 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2992 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
2998 return entry->show(rdev, page);
3002 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3003 const char *page, size_t length)
3005 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3006 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3008 struct mddev *mddev = rdev->mddev;
3012 if (!capable(CAP_SYS_ADMIN))
3014 rv = mddev ? mddev_lock(mddev): -EBUSY;
3016 if (rdev->mddev == NULL)
3019 rv = entry->store(rdev, page, length);
3020 mddev_unlock(mddev);
3025 static void rdev_free(struct kobject *ko)
3027 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3030 static const struct sysfs_ops rdev_sysfs_ops = {
3031 .show = rdev_attr_show,
3032 .store = rdev_attr_store,
3034 static struct kobj_type rdev_ktype = {
3035 .release = rdev_free,
3036 .sysfs_ops = &rdev_sysfs_ops,
3037 .default_attrs = rdev_default_attrs,
3040 int md_rdev_init(struct md_rdev *rdev)
3043 rdev->saved_raid_disk = -1;
3044 rdev->raid_disk = -1;
3046 rdev->data_offset = 0;
3047 rdev->new_data_offset = 0;
3048 rdev->sb_events = 0;
3049 rdev->last_read_error.tv_sec = 0;
3050 rdev->last_read_error.tv_nsec = 0;
3051 rdev->sb_loaded = 0;
3052 rdev->bb_page = NULL;
3053 atomic_set(&rdev->nr_pending, 0);
3054 atomic_set(&rdev->read_errors, 0);
3055 atomic_set(&rdev->corrected_errors, 0);
3057 INIT_LIST_HEAD(&rdev->same_set);
3058 init_waitqueue_head(&rdev->blocked_wait);
3060 /* Add space to store bad block list.
3061 * This reserves the space even on arrays where it cannot
3062 * be used - I wonder if that matters
3064 rdev->badblocks.count = 0;
3065 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3066 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3067 seqlock_init(&rdev->badblocks.lock);
3068 if (rdev->badblocks.page == NULL)
3073 EXPORT_SYMBOL_GPL(md_rdev_init);
3075 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3077 * mark the device faulty if:
3079 * - the device is nonexistent (zero size)
3080 * - the device has no valid superblock
3082 * a faulty rdev _never_ has rdev->sb set.
3084 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3086 char b[BDEVNAME_SIZE];
3088 struct md_rdev *rdev;
3091 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3093 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3094 return ERR_PTR(-ENOMEM);
3097 err = md_rdev_init(rdev);
3100 err = alloc_disk_sb(rdev);
3104 err = lock_rdev(rdev, newdev, super_format == -2);
3108 kobject_init(&rdev->kobj, &rdev_ktype);
3110 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3113 "md: %s has zero or unknown size, marking faulty!\n",
3114 bdevname(rdev->bdev,b));
3119 if (super_format >= 0) {
3120 err = super_types[super_format].
3121 load_super(rdev, NULL, super_minor);
3122 if (err == -EINVAL) {
3124 "md: %s does not have a valid v%d.%d "
3125 "superblock, not importing!\n",
3126 bdevname(rdev->bdev,b),
3127 super_format, super_minor);
3132 "md: could not read %s's sb, not importing!\n",
3133 bdevname(rdev->bdev,b));
3143 md_rdev_clear(rdev);
3145 return ERR_PTR(err);
3149 * Check a full RAID array for plausibility
3152 static void analyze_sbs(struct mddev *mddev)
3155 struct md_rdev *rdev, *freshest, *tmp;
3156 char b[BDEVNAME_SIZE];
3159 rdev_for_each_safe(rdev, tmp, mddev)
3160 switch (super_types[mddev->major_version].
3161 load_super(rdev, freshest, mddev->minor_version)) {
3169 "md: fatal superblock inconsistency in %s"
3170 " -- removing from array\n",
3171 bdevname(rdev->bdev,b));
3172 md_kick_rdev_from_array(rdev);
3175 super_types[mddev->major_version].
3176 validate_super(mddev, freshest);
3179 rdev_for_each_safe(rdev, tmp, mddev) {
3180 if (mddev->max_disks &&
3181 (rdev->desc_nr >= mddev->max_disks ||
3182 i > mddev->max_disks)) {
3184 "md: %s: %s: only %d devices permitted\n",
3185 mdname(mddev), bdevname(rdev->bdev, b),
3187 md_kick_rdev_from_array(rdev);
3190 if (rdev != freshest) {
3191 if (super_types[mddev->major_version].
3192 validate_super(mddev, rdev)) {
3193 printk(KERN_WARNING "md: kicking non-fresh %s"
3195 bdevname(rdev->bdev,b));
3196 md_kick_rdev_from_array(rdev);
3199 /* No device should have a Candidate flag
3200 * when reading devices
3202 if (test_bit(Candidate, &rdev->flags)) {
3203 pr_info("md: kicking Cluster Candidate %s from array!\n",
3204 bdevname(rdev->bdev, b));
3205 md_kick_rdev_from_array(rdev);
3208 if (mddev->level == LEVEL_MULTIPATH) {
3209 rdev->desc_nr = i++;
3210 rdev->raid_disk = rdev->desc_nr;
3211 set_bit(In_sync, &rdev->flags);
3212 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3213 rdev->raid_disk = -1;
3214 clear_bit(In_sync, &rdev->flags);
3219 /* Read a fixed-point number.
3220 * Numbers in sysfs attributes should be in "standard" units where
3221 * possible, so time should be in seconds.
3222 * However we internally use a a much smaller unit such as
3223 * milliseconds or jiffies.
3224 * This function takes a decimal number with a possible fractional
3225 * component, and produces an integer which is the result of
3226 * multiplying that number by 10^'scale'.
3227 * all without any floating-point arithmetic.
3229 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3231 unsigned long result = 0;
3233 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3236 else if (decimals < scale) {
3239 result = result * 10 + value;
3251 while (decimals < scale) {
3260 safe_delay_show(struct mddev *mddev, char *page)
3262 int msec = (mddev->safemode_delay*1000)/HZ;
3263 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3266 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3270 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3273 mddev->safemode_delay = 0;
3275 unsigned long old_delay = mddev->safemode_delay;
3276 unsigned long new_delay = (msec*HZ)/1000;
3280 mddev->safemode_delay = new_delay;
3281 if (new_delay < old_delay || old_delay == 0)
3282 mod_timer(&mddev->safemode_timer, jiffies+1);
3286 static struct md_sysfs_entry md_safe_delay =
3287 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3290 level_show(struct mddev *mddev, char *page)
3292 struct md_personality *p;
3294 spin_lock(&mddev->lock);
3297 ret = sprintf(page, "%s\n", p->name);
3298 else if (mddev->clevel[0])
3299 ret = sprintf(page, "%s\n", mddev->clevel);
3300 else if (mddev->level != LEVEL_NONE)
3301 ret = sprintf(page, "%d\n", mddev->level);
3304 spin_unlock(&mddev->lock);
3309 level_store(struct mddev *mddev, const char *buf, size_t len)
3314 struct md_personality *pers, *oldpers;
3316 void *priv, *oldpriv;
3317 struct md_rdev *rdev;
3319 if (slen == 0 || slen >= sizeof(clevel))
3322 rv = mddev_lock(mddev);
3326 if (mddev->pers == NULL) {
3327 strncpy(mddev->clevel, buf, slen);
3328 if (mddev->clevel[slen-1] == '\n')
3330 mddev->clevel[slen] = 0;
3331 mddev->level = LEVEL_NONE;
3339 /* request to change the personality. Need to ensure:
3340 * - array is not engaged in resync/recovery/reshape
3341 * - old personality can be suspended
3342 * - new personality will access other array.
3346 if (mddev->sync_thread ||
3347 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3348 mddev->reshape_position != MaxSector ||
3349 mddev->sysfs_active)
3353 if (!mddev->pers->quiesce) {
3354 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3355 mdname(mddev), mddev->pers->name);
3359 /* Now find the new personality */
3360 strncpy(clevel, buf, slen);
3361 if (clevel[slen-1] == '\n')
3364 if (kstrtol(clevel, 10, &level))
3367 if (request_module("md-%s", clevel) != 0)
3368 request_module("md-level-%s", clevel);
3369 spin_lock(&pers_lock);
3370 pers = find_pers(level, clevel);
3371 if (!pers || !try_module_get(pers->owner)) {
3372 spin_unlock(&pers_lock);
3373 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3377 spin_unlock(&pers_lock);
3379 if (pers == mddev->pers) {
3380 /* Nothing to do! */
3381 module_put(pers->owner);
3385 if (!pers->takeover) {
3386 module_put(pers->owner);
3387 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3388 mdname(mddev), clevel);
3393 rdev_for_each(rdev, mddev)
3394 rdev->new_raid_disk = rdev->raid_disk;
3396 /* ->takeover must set new_* and/or delta_disks
3397 * if it succeeds, and may set them when it fails.
3399 priv = pers->takeover(mddev);
3401 mddev->new_level = mddev->level;
3402 mddev->new_layout = mddev->layout;
3403 mddev->new_chunk_sectors = mddev->chunk_sectors;
3404 mddev->raid_disks -= mddev->delta_disks;
3405 mddev->delta_disks = 0;
3406 mddev->reshape_backwards = 0;
3407 module_put(pers->owner);
3408 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3409 mdname(mddev), clevel);
3414 /* Looks like we have a winner */
3415 mddev_suspend(mddev);
3416 mddev_detach(mddev);
3418 spin_lock(&mddev->lock);
3419 oldpers = mddev->pers;
3420 oldpriv = mddev->private;
3422 mddev->private = priv;
3423 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3424 mddev->level = mddev->new_level;
3425 mddev->layout = mddev->new_layout;
3426 mddev->chunk_sectors = mddev->new_chunk_sectors;
3427 mddev->delta_disks = 0;
3428 mddev->reshape_backwards = 0;
3429 mddev->degraded = 0;
3430 spin_unlock(&mddev->lock);
3432 if (oldpers->sync_request == NULL &&
3434 /* We are converting from a no-redundancy array
3435 * to a redundancy array and metadata is managed
3436 * externally so we need to be sure that writes
3437 * won't block due to a need to transition
3439 * until external management is started.
3442 mddev->safemode_delay = 0;
3443 mddev->safemode = 0;
3446 oldpers->free(mddev, oldpriv);
3448 if (oldpers->sync_request == NULL &&
3449 pers->sync_request != NULL) {
3450 /* need to add the md_redundancy_group */
3451 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3453 "md: cannot register extra attributes for %s\n",
3455 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3457 if (oldpers->sync_request != NULL &&
3458 pers->sync_request == NULL) {
3459 /* need to remove the md_redundancy_group */
3460 if (mddev->to_remove == NULL)
3461 mddev->to_remove = &md_redundancy_group;
3464 rdev_for_each(rdev, mddev) {
3465 if (rdev->raid_disk < 0)
3467 if (rdev->new_raid_disk >= mddev->raid_disks)
3468 rdev->new_raid_disk = -1;
3469 if (rdev->new_raid_disk == rdev->raid_disk)
3471 sysfs_unlink_rdev(mddev, rdev);
3473 rdev_for_each(rdev, mddev) {
3474 if (rdev->raid_disk < 0)
3476 if (rdev->new_raid_disk == rdev->raid_disk)
3478 rdev->raid_disk = rdev->new_raid_disk;
3479 if (rdev->raid_disk < 0)
3480 clear_bit(In_sync, &rdev->flags);
3482 if (sysfs_link_rdev(mddev, rdev))
3483 printk(KERN_WARNING "md: cannot register rd%d"
3484 " for %s after level change\n",
3485 rdev->raid_disk, mdname(mddev));
3489 if (pers->sync_request == NULL) {
3490 /* this is now an array without redundancy, so
3491 * it must always be in_sync
3494 del_timer_sync(&mddev->safemode_timer);
3496 blk_set_stacking_limits(&mddev->queue->limits);
3498 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3499 mddev_resume(mddev);
3501 md_update_sb(mddev, 1);
3502 sysfs_notify(&mddev->kobj, NULL, "level");
3503 md_new_event(mddev);
3506 mddev_unlock(mddev);
3510 static struct md_sysfs_entry md_level =
3511 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3514 layout_show(struct mddev *mddev, char *page)
3516 /* just a number, not meaningful for all levels */
3517 if (mddev->reshape_position != MaxSector &&
3518 mddev->layout != mddev->new_layout)
3519 return sprintf(page, "%d (%d)\n",
3520 mddev->new_layout, mddev->layout);
3521 return sprintf(page, "%d\n", mddev->layout);
3525 layout_store(struct mddev *mddev, const char *buf, size_t len)
3530 err = kstrtouint(buf, 10, &n);
3533 err = mddev_lock(mddev);
3538 if (mddev->pers->check_reshape == NULL)
3543 mddev->new_layout = n;
3544 err = mddev->pers->check_reshape(mddev);
3546 mddev->new_layout = mddev->layout;
3549 mddev->new_layout = n;
3550 if (mddev->reshape_position == MaxSector)
3553 mddev_unlock(mddev);
3556 static struct md_sysfs_entry md_layout =
3557 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3560 raid_disks_show(struct mddev *mddev, char *page)
3562 if (mddev->raid_disks == 0)
3564 if (mddev->reshape_position != MaxSector &&
3565 mddev->delta_disks != 0)
3566 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3567 mddev->raid_disks - mddev->delta_disks);
3568 return sprintf(page, "%d\n", mddev->raid_disks);
3571 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3574 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3579 err = kstrtouint(buf, 10, &n);
3583 err = mddev_lock(mddev);
3587 err = update_raid_disks(mddev, n);
3588 else if (mddev->reshape_position != MaxSector) {
3589 struct md_rdev *rdev;
3590 int olddisks = mddev->raid_disks - mddev->delta_disks;
3593 rdev_for_each(rdev, mddev) {
3595 rdev->data_offset < rdev->new_data_offset)
3598 rdev->data_offset > rdev->new_data_offset)
3602 mddev->delta_disks = n - olddisks;
3603 mddev->raid_disks = n;
3604 mddev->reshape_backwards = (mddev->delta_disks < 0);
3606 mddev->raid_disks = n;
3608 mddev_unlock(mddev);
3609 return err ? err : len;
3611 static struct md_sysfs_entry md_raid_disks =
3612 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3615 chunk_size_show(struct mddev *mddev, char *page)
3617 if (mddev->reshape_position != MaxSector &&
3618 mddev->chunk_sectors != mddev->new_chunk_sectors)
3619 return sprintf(page, "%d (%d)\n",
3620 mddev->new_chunk_sectors << 9,
3621 mddev->chunk_sectors << 9);
3622 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3626 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3631 err = kstrtoul(buf, 10, &n);
3635 err = mddev_lock(mddev);
3639 if (mddev->pers->check_reshape == NULL)
3644 mddev->new_chunk_sectors = n >> 9;
3645 err = mddev->pers->check_reshape(mddev);
3647 mddev->new_chunk_sectors = mddev->chunk_sectors;
3650 mddev->new_chunk_sectors = n >> 9;
3651 if (mddev->reshape_position == MaxSector)
3652 mddev->chunk_sectors = n >> 9;
3654 mddev_unlock(mddev);
3657 static struct md_sysfs_entry md_chunk_size =
3658 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3661 resync_start_show(struct mddev *mddev, char *page)
3663 if (mddev->recovery_cp == MaxSector)
3664 return sprintf(page, "none\n");
3665 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3669 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3671 unsigned long long n;
3674 if (cmd_match(buf, "none"))
3677 err = kstrtoull(buf, 10, &n);
3680 if (n != (sector_t)n)
3684 err = mddev_lock(mddev);
3687 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3691 mddev->recovery_cp = n;
3693 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3695 mddev_unlock(mddev);
3698 static struct md_sysfs_entry md_resync_start =
3699 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3700 resync_start_show, resync_start_store);
3703 * The array state can be:
3706 * No devices, no size, no level
3707 * Equivalent to STOP_ARRAY ioctl
3709 * May have some settings, but array is not active
3710 * all IO results in error
3711 * When written, doesn't tear down array, but just stops it
3712 * suspended (not supported yet)
3713 * All IO requests will block. The array can be reconfigured.
3714 * Writing this, if accepted, will block until array is quiescent
3716 * no resync can happen. no superblocks get written.
3717 * write requests fail
3719 * like readonly, but behaves like 'clean' on a write request.
3721 * clean - no pending writes, but otherwise active.
3722 * When written to inactive array, starts without resync
3723 * If a write request arrives then
3724 * if metadata is known, mark 'dirty' and switch to 'active'.
3725 * if not known, block and switch to write-pending
3726 * If written to an active array that has pending writes, then fails.
3728 * fully active: IO and resync can be happening.
3729 * When written to inactive array, starts with resync
3732 * clean, but writes are blocked waiting for 'active' to be written.
3735 * like active, but no writes have been seen for a while (100msec).
3738 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3739 write_pending, active_idle, bad_word};
3740 static char *array_states[] = {
3741 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3742 "write-pending", "active-idle", NULL };
3744 static int match_word(const char *word, char **list)
3747 for (n=0; list[n]; n++)
3748 if (cmd_match(word, list[n]))
3754 array_state_show(struct mddev *mddev, char *page)
3756 enum array_state st = inactive;
3769 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3771 else if (mddev->safemode)
3777 if (list_empty(&mddev->disks) &&
3778 mddev->raid_disks == 0 &&
3779 mddev->dev_sectors == 0)
3784 return sprintf(page, "%s\n", array_states[st]);
3787 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3788 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3789 static int do_md_run(struct mddev *mddev);
3790 static int restart_array(struct mddev *mddev);
3793 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3796 enum array_state st = match_word(buf, array_states);
3798 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3799 /* don't take reconfig_mutex when toggling between
3802 spin_lock(&mddev->lock);
3804 restart_array(mddev);
3805 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3806 wake_up(&mddev->sb_wait);
3808 } else /* st == clean */ {
3809 restart_array(mddev);
3810 if (atomic_read(&mddev->writes_pending) == 0) {
3811 if (mddev->in_sync == 0) {
3813 if (mddev->safemode == 1)
3814 mddev->safemode = 0;
3815 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3821 spin_unlock(&mddev->lock);
3824 err = mddev_lock(mddev);
3832 /* stopping an active array */
3833 err = do_md_stop(mddev, 0, NULL);
3836 /* stopping an active array */
3838 err = do_md_stop(mddev, 2, NULL);
3840 err = 0; /* already inactive */
3843 break; /* not supported yet */
3846 err = md_set_readonly(mddev, NULL);
3849 set_disk_ro(mddev->gendisk, 1);
3850 err = do_md_run(mddev);
3856 err = md_set_readonly(mddev, NULL);
3857 else if (mddev->ro == 1)
3858 err = restart_array(mddev);
3861 set_disk_ro(mddev->gendisk, 0);
3865 err = do_md_run(mddev);
3870 restart_array(mddev);
3871 spin_lock(&mddev->lock);
3872 if (atomic_read(&mddev->writes_pending) == 0) {
3873 if (mddev->in_sync == 0) {
3875 if (mddev->safemode == 1)
3876 mddev->safemode = 0;
3877 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3882 spin_unlock(&mddev->lock);
3888 restart_array(mddev);
3889 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3890 wake_up(&mddev->sb_wait);
3894 set_disk_ro(mddev->gendisk, 0);
3895 err = do_md_run(mddev);
3900 /* these cannot be set */
3905 if (mddev->hold_active == UNTIL_IOCTL)
3906 mddev->hold_active = 0;
3907 sysfs_notify_dirent_safe(mddev->sysfs_state);
3909 mddev_unlock(mddev);
3912 static struct md_sysfs_entry md_array_state =
3913 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3916 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3917 return sprintf(page, "%d\n",
3918 atomic_read(&mddev->max_corr_read_errors));
3922 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3927 rv = kstrtouint(buf, 10, &n);
3930 atomic_set(&mddev->max_corr_read_errors, n);
3934 static struct md_sysfs_entry max_corr_read_errors =
3935 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3936 max_corrected_read_errors_store);
3939 null_show(struct mddev *mddev, char *page)
3945 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3947 /* buf must be %d:%d\n? giving major and minor numbers */
3948 /* The new device is added to the array.
3949 * If the array has a persistent superblock, we read the
3950 * superblock to initialise info and check validity.
3951 * Otherwise, only checking done is that in bind_rdev_to_array,
3952 * which mainly checks size.
3955 int major = simple_strtoul(buf, &e, 10);
3958 struct md_rdev *rdev;
3961 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3963 minor = simple_strtoul(e+1, &e, 10);
3964 if (*e && *e != '\n')
3966 dev = MKDEV(major, minor);
3967 if (major != MAJOR(dev) ||
3968 minor != MINOR(dev))
3971 flush_workqueue(md_misc_wq);
3973 err = mddev_lock(mddev);
3976 if (mddev->persistent) {
3977 rdev = md_import_device(dev, mddev->major_version,
3978 mddev->minor_version);
3979 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3980 struct md_rdev *rdev0
3981 = list_entry(mddev->disks.next,
3982 struct md_rdev, same_set);
3983 err = super_types[mddev->major_version]
3984 .load_super(rdev, rdev0, mddev->minor_version);
3988 } else if (mddev->external)
3989 rdev = md_import_device(dev, -2, -1);
3991 rdev = md_import_device(dev, -1, -1);
3994 mddev_unlock(mddev);
3995 return PTR_ERR(rdev);
3997 err = bind_rdev_to_array(rdev, mddev);
4001 mddev_unlock(mddev);
4002 return err ? err : len;
4005 static struct md_sysfs_entry md_new_device =
4006 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4009 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4012 unsigned long chunk, end_chunk;
4015 err = mddev_lock(mddev);
4020 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4022 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4023 if (buf == end) break;
4024 if (*end == '-') { /* range */
4026 end_chunk = simple_strtoul(buf, &end, 0);
4027 if (buf == end) break;
4029 if (*end && !isspace(*end)) break;
4030 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4031 buf = skip_spaces(end);
4033 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4035 mddev_unlock(mddev);
4039 static struct md_sysfs_entry md_bitmap =
4040 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4043 size_show(struct mddev *mddev, char *page)
4045 return sprintf(page, "%llu\n",
4046 (unsigned long long)mddev->dev_sectors / 2);
4049 static int update_size(struct mddev *mddev, sector_t num_sectors);
4052 size_store(struct mddev *mddev, const char *buf, size_t len)
4054 /* If array is inactive, we can reduce the component size, but
4055 * not increase it (except from 0).
4056 * If array is active, we can try an on-line resize
4059 int err = strict_blocks_to_sectors(buf, §ors);
4063 err = mddev_lock(mddev);
4067 if (mddev_is_clustered(mddev))
4068 md_cluster_ops->metadata_update_start(mddev);
4069 err = update_size(mddev, sectors);
4070 md_update_sb(mddev, 1);
4071 if (mddev_is_clustered(mddev))
4072 md_cluster_ops->metadata_update_finish(mddev);
4074 if (mddev->dev_sectors == 0 ||
4075 mddev->dev_sectors > sectors)
4076 mddev->dev_sectors = sectors;
4080 mddev_unlock(mddev);
4081 return err ? err : len;
4084 static struct md_sysfs_entry md_size =
4085 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4087 /* Metadata version.
4089 * 'none' for arrays with no metadata (good luck...)
4090 * 'external' for arrays with externally managed metadata,
4091 * or N.M for internally known formats
4094 metadata_show(struct mddev *mddev, char *page)
4096 if (mddev->persistent)
4097 return sprintf(page, "%d.%d\n",
4098 mddev->major_version, mddev->minor_version);
4099 else if (mddev->external)
4100 return sprintf(page, "external:%s\n", mddev->metadata_type);
4102 return sprintf(page, "none\n");
4106 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4111 /* Changing the details of 'external' metadata is
4112 * always permitted. Otherwise there must be
4113 * no devices attached to the array.
4116 err = mddev_lock(mddev);
4120 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4122 else if (!list_empty(&mddev->disks))
4126 if (cmd_match(buf, "none")) {
4127 mddev->persistent = 0;
4128 mddev->external = 0;
4129 mddev->major_version = 0;
4130 mddev->minor_version = 90;
4133 if (strncmp(buf, "external:", 9) == 0) {
4134 size_t namelen = len-9;
4135 if (namelen >= sizeof(mddev->metadata_type))
4136 namelen = sizeof(mddev->metadata_type)-1;
4137 strncpy(mddev->metadata_type, buf+9, namelen);
4138 mddev->metadata_type[namelen] = 0;
4139 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4140 mddev->metadata_type[--namelen] = 0;
4141 mddev->persistent = 0;
4142 mddev->external = 1;
4143 mddev->major_version = 0;
4144 mddev->minor_version = 90;
4147 major = simple_strtoul(buf, &e, 10);
4149 if (e==buf || *e != '.')
4152 minor = simple_strtoul(buf, &e, 10);
4153 if (e==buf || (*e && *e != '\n') )
4156 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4158 mddev->major_version = major;
4159 mddev->minor_version = minor;
4160 mddev->persistent = 1;
4161 mddev->external = 0;
4164 mddev_unlock(mddev);
4168 static struct md_sysfs_entry md_metadata =
4169 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4172 action_show(struct mddev *mddev, char *page)
4174 char *type = "idle";
4175 unsigned long recovery = mddev->recovery;
4176 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4178 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4179 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4180 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4182 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4183 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4185 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4189 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4191 else if (mddev->reshape_position != MaxSector)
4194 return sprintf(page, "%s\n", type);
4198 action_store(struct mddev *mddev, const char *page, size_t len)
4200 if (!mddev->pers || !mddev->pers->sync_request)
4204 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4205 if (cmd_match(page, "frozen"))
4206 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4208 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4209 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4210 mddev_lock(mddev) == 0) {
4211 flush_workqueue(md_misc_wq);
4212 if (mddev->sync_thread) {
4213 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4214 md_reap_sync_thread(mddev);
4216 mddev_unlock(mddev);
4218 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4219 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4221 else if (cmd_match(page, "resync"))
4222 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4223 else if (cmd_match(page, "recover")) {
4224 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4225 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4226 } else if (cmd_match(page, "reshape")) {
4228 if (mddev->pers->start_reshape == NULL)
4230 err = mddev_lock(mddev);
4232 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4233 err = mddev->pers->start_reshape(mddev);
4234 mddev_unlock(mddev);
4238 sysfs_notify(&mddev->kobj, NULL, "degraded");
4240 if (cmd_match(page, "check"))
4241 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4242 else if (!cmd_match(page, "repair"))
4244 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4245 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4246 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4248 if (mddev->ro == 2) {
4249 /* A write to sync_action is enough to justify
4250 * canceling read-auto mode
4253 md_wakeup_thread(mddev->sync_thread);
4255 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4256 md_wakeup_thread(mddev->thread);
4257 sysfs_notify_dirent_safe(mddev->sysfs_action);
4261 static struct md_sysfs_entry md_scan_mode =
4262 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4265 last_sync_action_show(struct mddev *mddev, char *page)
4267 return sprintf(page, "%s\n", mddev->last_sync_action);
4270 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4273 mismatch_cnt_show(struct mddev *mddev, char *page)
4275 return sprintf(page, "%llu\n",
4276 (unsigned long long)
4277 atomic64_read(&mddev->resync_mismatches));
4280 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4283 sync_min_show(struct mddev *mddev, char *page)
4285 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4286 mddev->sync_speed_min ? "local": "system");
4290 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4295 if (strncmp(buf, "system", 6)==0) {
4298 rv = kstrtouint(buf, 10, &min);
4304 mddev->sync_speed_min = min;
4308 static struct md_sysfs_entry md_sync_min =
4309 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4312 sync_max_show(struct mddev *mddev, char *page)
4314 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4315 mddev->sync_speed_max ? "local": "system");
4319 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4324 if (strncmp(buf, "system", 6)==0) {
4327 rv = kstrtouint(buf, 10, &max);
4333 mddev->sync_speed_max = max;
4337 static struct md_sysfs_entry md_sync_max =
4338 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4341 degraded_show(struct mddev *mddev, char *page)
4343 return sprintf(page, "%d\n", mddev->degraded);
4345 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4348 sync_force_parallel_show(struct mddev *mddev, char *page)
4350 return sprintf(page, "%d\n", mddev->parallel_resync);
4354 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4358 if (kstrtol(buf, 10, &n))
4361 if (n != 0 && n != 1)
4364 mddev->parallel_resync = n;
4366 if (mddev->sync_thread)
4367 wake_up(&resync_wait);
4372 /* force parallel resync, even with shared block devices */
4373 static struct md_sysfs_entry md_sync_force_parallel =
4374 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4375 sync_force_parallel_show, sync_force_parallel_store);
4378 sync_speed_show(struct mddev *mddev, char *page)
4380 unsigned long resync, dt, db;
4381 if (mddev->curr_resync == 0)
4382 return sprintf(page, "none\n");
4383 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4384 dt = (jiffies - mddev->resync_mark) / HZ;
4386 db = resync - mddev->resync_mark_cnt;
4387 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4390 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4393 sync_completed_show(struct mddev *mddev, char *page)
4395 unsigned long long max_sectors, resync;
4397 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4398 return sprintf(page, "none\n");
4400 if (mddev->curr_resync == 1 ||
4401 mddev->curr_resync == 2)
4402 return sprintf(page, "delayed\n");
4404 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4405 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4406 max_sectors = mddev->resync_max_sectors;
4408 max_sectors = mddev->dev_sectors;
4410 resync = mddev->curr_resync_completed;
4411 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4414 static struct md_sysfs_entry md_sync_completed =
4415 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4418 min_sync_show(struct mddev *mddev, char *page)
4420 return sprintf(page, "%llu\n",
4421 (unsigned long long)mddev->resync_min);
4424 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4426 unsigned long long min;
4429 if (kstrtoull(buf, 10, &min))
4432 spin_lock(&mddev->lock);
4434 if (min > mddev->resync_max)
4438 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4441 /* Round down to multiple of 4K for safety */
4442 mddev->resync_min = round_down(min, 8);
4446 spin_unlock(&mddev->lock);
4450 static struct md_sysfs_entry md_min_sync =
4451 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4454 max_sync_show(struct mddev *mddev, char *page)
4456 if (mddev->resync_max == MaxSector)
4457 return sprintf(page, "max\n");
4459 return sprintf(page, "%llu\n",
4460 (unsigned long long)mddev->resync_max);
4463 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4466 spin_lock(&mddev->lock);
4467 if (strncmp(buf, "max", 3) == 0)
4468 mddev->resync_max = MaxSector;
4470 unsigned long long max;
4474 if (kstrtoull(buf, 10, &max))
4476 if (max < mddev->resync_min)
4480 if (max < mddev->resync_max &&
4482 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4485 /* Must be a multiple of chunk_size */
4486 chunk = mddev->chunk_sectors;
4488 sector_t temp = max;
4491 if (sector_div(temp, chunk))
4494 mddev->resync_max = max;
4496 wake_up(&mddev->recovery_wait);
4499 spin_unlock(&mddev->lock);
4503 static struct md_sysfs_entry md_max_sync =
4504 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4507 suspend_lo_show(struct mddev *mddev, char *page)
4509 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4513 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4515 unsigned long long old, new;
4518 err = kstrtoull(buf, 10, &new);
4521 if (new != (sector_t)new)
4524 err = mddev_lock(mddev);
4528 if (mddev->pers == NULL ||
4529 mddev->pers->quiesce == NULL)
4531 old = mddev->suspend_lo;
4532 mddev->suspend_lo = new;
4534 /* Shrinking suspended region */
4535 mddev->pers->quiesce(mddev, 2);
4537 /* Expanding suspended region - need to wait */
4538 mddev->pers->quiesce(mddev, 1);
4539 mddev->pers->quiesce(mddev, 0);
4543 mddev_unlock(mddev);
4546 static struct md_sysfs_entry md_suspend_lo =
4547 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4550 suspend_hi_show(struct mddev *mddev, char *page)
4552 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4556 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4558 unsigned long long old, new;
4561 err = kstrtoull(buf, 10, &new);
4564 if (new != (sector_t)new)
4567 err = mddev_lock(mddev);
4571 if (mddev->pers == NULL ||
4572 mddev->pers->quiesce == NULL)
4574 old = mddev->suspend_hi;
4575 mddev->suspend_hi = new;
4577 /* Shrinking suspended region */
4578 mddev->pers->quiesce(mddev, 2);
4580 /* Expanding suspended region - need to wait */
4581 mddev->pers->quiesce(mddev, 1);
4582 mddev->pers->quiesce(mddev, 0);
4586 mddev_unlock(mddev);
4589 static struct md_sysfs_entry md_suspend_hi =
4590 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4593 reshape_position_show(struct mddev *mddev, char *page)
4595 if (mddev->reshape_position != MaxSector)
4596 return sprintf(page, "%llu\n",
4597 (unsigned long long)mddev->reshape_position);
4598 strcpy(page, "none\n");
4603 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4605 struct md_rdev *rdev;
4606 unsigned long long new;
4609 err = kstrtoull(buf, 10, &new);
4612 if (new != (sector_t)new)
4614 err = mddev_lock(mddev);
4620 mddev->reshape_position = new;
4621 mddev->delta_disks = 0;
4622 mddev->reshape_backwards = 0;
4623 mddev->new_level = mddev->level;
4624 mddev->new_layout = mddev->layout;
4625 mddev->new_chunk_sectors = mddev->chunk_sectors;
4626 rdev_for_each(rdev, mddev)
4627 rdev->new_data_offset = rdev->data_offset;
4630 mddev_unlock(mddev);
4634 static struct md_sysfs_entry md_reshape_position =
4635 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4636 reshape_position_store);
4639 reshape_direction_show(struct mddev *mddev, char *page)
4641 return sprintf(page, "%s\n",
4642 mddev->reshape_backwards ? "backwards" : "forwards");
4646 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4651 if (cmd_match(buf, "forwards"))
4653 else if (cmd_match(buf, "backwards"))
4657 if (mddev->reshape_backwards == backwards)
4660 err = mddev_lock(mddev);
4663 /* check if we are allowed to change */
4664 if (mddev->delta_disks)
4666 else if (mddev->persistent &&
4667 mddev->major_version == 0)
4670 mddev->reshape_backwards = backwards;
4671 mddev_unlock(mddev);
4675 static struct md_sysfs_entry md_reshape_direction =
4676 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4677 reshape_direction_store);
4680 array_size_show(struct mddev *mddev, char *page)
4682 if (mddev->external_size)
4683 return sprintf(page, "%llu\n",
4684 (unsigned long long)mddev->array_sectors/2);
4686 return sprintf(page, "default\n");
4690 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4695 err = mddev_lock(mddev);
4699 if (strncmp(buf, "default", 7) == 0) {
4701 sectors = mddev->pers->size(mddev, 0, 0);
4703 sectors = mddev->array_sectors;
4705 mddev->external_size = 0;
4707 if (strict_blocks_to_sectors(buf, §ors) < 0)
4709 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4712 mddev->external_size = 1;
4716 mddev->array_sectors = sectors;
4718 set_capacity(mddev->gendisk, mddev->array_sectors);
4719 revalidate_disk(mddev->gendisk);
4722 mddev_unlock(mddev);
4726 static struct md_sysfs_entry md_array_size =
4727 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4730 static struct attribute *md_default_attrs[] = {
4733 &md_raid_disks.attr,
4734 &md_chunk_size.attr,
4736 &md_resync_start.attr,
4738 &md_new_device.attr,
4739 &md_safe_delay.attr,
4740 &md_array_state.attr,
4741 &md_reshape_position.attr,
4742 &md_reshape_direction.attr,
4743 &md_array_size.attr,
4744 &max_corr_read_errors.attr,
4748 static struct attribute *md_redundancy_attrs[] = {
4750 &md_last_scan_mode.attr,
4751 &md_mismatches.attr,
4754 &md_sync_speed.attr,
4755 &md_sync_force_parallel.attr,
4756 &md_sync_completed.attr,
4759 &md_suspend_lo.attr,
4760 &md_suspend_hi.attr,
4765 static struct attribute_group md_redundancy_group = {
4767 .attrs = md_redundancy_attrs,
4771 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4773 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4774 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4779 spin_lock(&all_mddevs_lock);
4780 if (list_empty(&mddev->all_mddevs)) {
4781 spin_unlock(&all_mddevs_lock);
4785 spin_unlock(&all_mddevs_lock);
4787 rv = entry->show(mddev, page);
4793 md_attr_store(struct kobject *kobj, struct attribute *attr,
4794 const char *page, size_t length)
4796 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4797 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4802 if (!capable(CAP_SYS_ADMIN))
4804 spin_lock(&all_mddevs_lock);
4805 if (list_empty(&mddev->all_mddevs)) {
4806 spin_unlock(&all_mddevs_lock);
4810 spin_unlock(&all_mddevs_lock);
4811 rv = entry->store(mddev, page, length);
4816 static void md_free(struct kobject *ko)
4818 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4820 if (mddev->sysfs_state)
4821 sysfs_put(mddev->sysfs_state);
4824 blk_cleanup_queue(mddev->queue);
4825 if (mddev->gendisk) {
4826 del_gendisk(mddev->gendisk);
4827 put_disk(mddev->gendisk);
4833 static const struct sysfs_ops md_sysfs_ops = {
4834 .show = md_attr_show,
4835 .store = md_attr_store,
4837 static struct kobj_type md_ktype = {
4839 .sysfs_ops = &md_sysfs_ops,
4840 .default_attrs = md_default_attrs,
4845 static void mddev_delayed_delete(struct work_struct *ws)
4847 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4849 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4850 kobject_del(&mddev->kobj);
4851 kobject_put(&mddev->kobj);
4854 static int md_alloc(dev_t dev, char *name)
4856 static DEFINE_MUTEX(disks_mutex);
4857 struct mddev *mddev = mddev_find(dev);
4858 struct gendisk *disk;
4867 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4868 shift = partitioned ? MdpMinorShift : 0;
4869 unit = MINOR(mddev->unit) >> shift;
4871 /* wait for any previous instance of this device to be
4872 * completely removed (mddev_delayed_delete).
4874 flush_workqueue(md_misc_wq);
4876 mutex_lock(&disks_mutex);
4882 /* Need to ensure that 'name' is not a duplicate.
4884 struct mddev *mddev2;
4885 spin_lock(&all_mddevs_lock);
4887 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4888 if (mddev2->gendisk &&
4889 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4890 spin_unlock(&all_mddevs_lock);
4893 spin_unlock(&all_mddevs_lock);
4897 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4900 mddev->queue->queuedata = mddev;
4902 blk_queue_make_request(mddev->queue, md_make_request);
4903 blk_set_stacking_limits(&mddev->queue->limits);
4905 disk = alloc_disk(1 << shift);
4907 blk_cleanup_queue(mddev->queue);
4908 mddev->queue = NULL;
4911 disk->major = MAJOR(mddev->unit);
4912 disk->first_minor = unit << shift;
4914 strcpy(disk->disk_name, name);
4915 else if (partitioned)
4916 sprintf(disk->disk_name, "md_d%d", unit);
4918 sprintf(disk->disk_name, "md%d", unit);
4919 disk->fops = &md_fops;
4920 disk->private_data = mddev;
4921 disk->queue = mddev->queue;
4922 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4923 /* Allow extended partitions. This makes the
4924 * 'mdp' device redundant, but we can't really
4927 disk->flags |= GENHD_FL_EXT_DEVT;
4928 mddev->gendisk = disk;
4929 /* As soon as we call add_disk(), another thread could get
4930 * through to md_open, so make sure it doesn't get too far
4932 mutex_lock(&mddev->open_mutex);
4935 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4936 &disk_to_dev(disk)->kobj, "%s", "md");
4938 /* This isn't possible, but as kobject_init_and_add is marked
4939 * __must_check, we must do something with the result
4941 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4945 if (mddev->kobj.sd &&
4946 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4947 printk(KERN_DEBUG "pointless warning\n");
4948 mutex_unlock(&mddev->open_mutex);
4950 mutex_unlock(&disks_mutex);
4951 if (!error && mddev->kobj.sd) {
4952 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4953 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4959 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4961 md_alloc(dev, NULL);
4965 static int add_named_array(const char *val, struct kernel_param *kp)
4967 /* val must be "md_*" where * is not all digits.
4968 * We allocate an array with a large free minor number, and
4969 * set the name to val. val must not already be an active name.
4971 int len = strlen(val);
4972 char buf[DISK_NAME_LEN];
4974 while (len && val[len-1] == '\n')
4976 if (len >= DISK_NAME_LEN)
4978 strlcpy(buf, val, len+1);
4979 if (strncmp(buf, "md_", 3) != 0)
4981 return md_alloc(0, buf);
4984 static void md_safemode_timeout(unsigned long data)
4986 struct mddev *mddev = (struct mddev *) data;
4988 if (!atomic_read(&mddev->writes_pending)) {
4989 mddev->safemode = 1;
4990 if (mddev->external)
4991 sysfs_notify_dirent_safe(mddev->sysfs_state);
4993 md_wakeup_thread(mddev->thread);
4996 static int start_dirty_degraded;
4998 int md_run(struct mddev *mddev)
5001 struct md_rdev *rdev;
5002 struct md_personality *pers;
5004 if (list_empty(&mddev->disks))
5005 /* cannot run an array with no devices.. */
5010 /* Cannot run until previous stop completes properly */
5011 if (mddev->sysfs_active)
5015 * Analyze all RAID superblock(s)
5017 if (!mddev->raid_disks) {
5018 if (!mddev->persistent)
5023 if (mddev->level != LEVEL_NONE)
5024 request_module("md-level-%d", mddev->level);
5025 else if (mddev->clevel[0])
5026 request_module("md-%s", mddev->clevel);
5029 * Drop all container device buffers, from now on
5030 * the only valid external interface is through the md
5033 rdev_for_each(rdev, mddev) {
5034 if (test_bit(Faulty, &rdev->flags))
5036 sync_blockdev(rdev->bdev);
5037 invalidate_bdev(rdev->bdev);
5039 /* perform some consistency tests on the device.
5040 * We don't want the data to overlap the metadata,
5041 * Internal Bitmap issues have been handled elsewhere.
5043 if (rdev->meta_bdev) {
5044 /* Nothing to check */;
5045 } else if (rdev->data_offset < rdev->sb_start) {
5046 if (mddev->dev_sectors &&
5047 rdev->data_offset + mddev->dev_sectors
5049 printk("md: %s: data overlaps metadata\n",
5054 if (rdev->sb_start + rdev->sb_size/512
5055 > rdev->data_offset) {
5056 printk("md: %s: metadata overlaps data\n",
5061 sysfs_notify_dirent_safe(rdev->sysfs_state);
5064 if (mddev->bio_set == NULL)
5065 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5067 spin_lock(&pers_lock);
5068 pers = find_pers(mddev->level, mddev->clevel);
5069 if (!pers || !try_module_get(pers->owner)) {
5070 spin_unlock(&pers_lock);
5071 if (mddev->level != LEVEL_NONE)
5072 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5075 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5079 spin_unlock(&pers_lock);
5080 if (mddev->level != pers->level) {
5081 mddev->level = pers->level;
5082 mddev->new_level = pers->level;
5084 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5086 if (mddev->reshape_position != MaxSector &&
5087 pers->start_reshape == NULL) {
5088 /* This personality cannot handle reshaping... */
5089 module_put(pers->owner);
5093 if (pers->sync_request) {
5094 /* Warn if this is a potentially silly
5097 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5098 struct md_rdev *rdev2;
5101 rdev_for_each(rdev, mddev)
5102 rdev_for_each(rdev2, mddev) {
5104 rdev->bdev->bd_contains ==
5105 rdev2->bdev->bd_contains) {
5107 "%s: WARNING: %s appears to be"
5108 " on the same physical disk as"
5111 bdevname(rdev->bdev,b),
5112 bdevname(rdev2->bdev,b2));
5119 "True protection against single-disk"
5120 " failure might be compromised.\n");
5123 mddev->recovery = 0;
5124 /* may be over-ridden by personality */
5125 mddev->resync_max_sectors = mddev->dev_sectors;
5127 mddev->ok_start_degraded = start_dirty_degraded;
5129 if (start_readonly && mddev->ro == 0)
5130 mddev->ro = 2; /* read-only, but switch on first write */
5132 err = pers->run(mddev);
5134 printk(KERN_ERR "md: pers->run() failed ...\n");
5135 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5136 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5137 " but 'external_size' not in effect?\n", __func__);
5139 "md: invalid array_size %llu > default size %llu\n",
5140 (unsigned long long)mddev->array_sectors / 2,
5141 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5144 if (err == 0 && pers->sync_request &&
5145 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5146 struct bitmap *bitmap;
5148 bitmap = bitmap_create(mddev, -1);
5149 if (IS_ERR(bitmap)) {
5150 err = PTR_ERR(bitmap);
5151 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5152 mdname(mddev), err);
5154 mddev->bitmap = bitmap;
5158 mddev_detach(mddev);
5160 pers->free(mddev, mddev->private);
5161 mddev->private = NULL;
5162 module_put(pers->owner);
5163 bitmap_destroy(mddev);
5167 mddev->queue->backing_dev_info.congested_data = mddev;
5168 mddev->queue->backing_dev_info.congested_fn = md_congested;
5170 if (pers->sync_request) {
5171 if (mddev->kobj.sd &&
5172 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5174 "md: cannot register extra attributes for %s\n",
5176 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5177 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5180 atomic_set(&mddev->writes_pending,0);
5181 atomic_set(&mddev->max_corr_read_errors,
5182 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5183 mddev->safemode = 0;
5184 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5187 spin_lock(&mddev->lock);
5190 spin_unlock(&mddev->lock);
5191 rdev_for_each(rdev, mddev)
5192 if (rdev->raid_disk >= 0)
5193 if (sysfs_link_rdev(mddev, rdev))
5194 /* failure here is OK */;
5196 if (mddev->degraded && !mddev->ro)
5197 /* This ensures that recovering status is reported immediately
5198 * via sysfs - until a lack of spares is confirmed.
5200 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5201 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5203 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5204 md_update_sb(mddev, 0);
5206 md_new_event(mddev);
5207 sysfs_notify_dirent_safe(mddev->sysfs_state);
5208 sysfs_notify_dirent_safe(mddev->sysfs_action);
5209 sysfs_notify(&mddev->kobj, NULL, "degraded");
5212 EXPORT_SYMBOL_GPL(md_run);
5214 static int do_md_run(struct mddev *mddev)
5218 err = md_run(mddev);
5221 err = bitmap_load(mddev);
5223 bitmap_destroy(mddev);
5227 md_wakeup_thread(mddev->thread);
5228 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5230 set_capacity(mddev->gendisk, mddev->array_sectors);
5231 revalidate_disk(mddev->gendisk);
5233 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5238 static int restart_array(struct mddev *mddev)
5240 struct gendisk *disk = mddev->gendisk;
5242 /* Complain if it has no devices */
5243 if (list_empty(&mddev->disks))
5249 mddev->safemode = 0;
5251 set_disk_ro(disk, 0);
5252 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5254 /* Kick recovery or resync if necessary */
5255 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5256 md_wakeup_thread(mddev->thread);
5257 md_wakeup_thread(mddev->sync_thread);
5258 sysfs_notify_dirent_safe(mddev->sysfs_state);
5262 static void md_clean(struct mddev *mddev)
5264 mddev->array_sectors = 0;
5265 mddev->external_size = 0;
5266 mddev->dev_sectors = 0;
5267 mddev->raid_disks = 0;
5268 mddev->recovery_cp = 0;
5269 mddev->resync_min = 0;
5270 mddev->resync_max = MaxSector;
5271 mddev->reshape_position = MaxSector;
5272 mddev->external = 0;
5273 mddev->persistent = 0;
5274 mddev->level = LEVEL_NONE;
5275 mddev->clevel[0] = 0;
5278 mddev->metadata_type[0] = 0;
5279 mddev->chunk_sectors = 0;
5280 mddev->ctime = mddev->utime = 0;
5282 mddev->max_disks = 0;
5284 mddev->can_decrease_events = 0;
5285 mddev->delta_disks = 0;
5286 mddev->reshape_backwards = 0;
5287 mddev->new_level = LEVEL_NONE;
5288 mddev->new_layout = 0;
5289 mddev->new_chunk_sectors = 0;
5290 mddev->curr_resync = 0;
5291 atomic64_set(&mddev->resync_mismatches, 0);
5292 mddev->suspend_lo = mddev->suspend_hi = 0;
5293 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5294 mddev->recovery = 0;
5297 mddev->degraded = 0;
5298 mddev->safemode = 0;
5299 mddev->private = NULL;
5300 mddev->bitmap_info.offset = 0;
5301 mddev->bitmap_info.default_offset = 0;
5302 mddev->bitmap_info.default_space = 0;
5303 mddev->bitmap_info.chunksize = 0;
5304 mddev->bitmap_info.daemon_sleep = 0;
5305 mddev->bitmap_info.max_write_behind = 0;
5308 static void __md_stop_writes(struct mddev *mddev)
5310 if (mddev_is_clustered(mddev))
5311 md_cluster_ops->metadata_update_start(mddev);
5312 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5313 flush_workqueue(md_misc_wq);
5314 if (mddev->sync_thread) {
5315 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5316 md_reap_sync_thread(mddev);
5319 del_timer_sync(&mddev->safemode_timer);
5321 bitmap_flush(mddev);
5322 md_super_wait(mddev);
5324 if (mddev->ro == 0 &&
5325 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5326 /* mark array as shutdown cleanly */
5328 md_update_sb(mddev, 1);
5330 if (mddev_is_clustered(mddev))
5331 md_cluster_ops->metadata_update_finish(mddev);
5334 void md_stop_writes(struct mddev *mddev)
5336 mddev_lock_nointr(mddev);
5337 __md_stop_writes(mddev);
5338 mddev_unlock(mddev);
5340 EXPORT_SYMBOL_GPL(md_stop_writes);
5342 static void mddev_detach(struct mddev *mddev)
5344 struct bitmap *bitmap = mddev->bitmap;
5345 /* wait for behind writes to complete */
5346 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5347 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5349 /* need to kick something here to make sure I/O goes? */
5350 wait_event(bitmap->behind_wait,
5351 atomic_read(&bitmap->behind_writes) == 0);
5353 if (mddev->pers && mddev->pers->quiesce) {
5354 mddev->pers->quiesce(mddev, 1);
5355 mddev->pers->quiesce(mddev, 0);
5357 md_unregister_thread(&mddev->thread);
5359 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5362 static void __md_stop(struct mddev *mddev)
5364 struct md_personality *pers = mddev->pers;
5365 mddev_detach(mddev);
5366 /* Ensure ->event_work is done */
5367 flush_workqueue(md_misc_wq);
5368 spin_lock(&mddev->lock);
5371 spin_unlock(&mddev->lock);
5372 pers->free(mddev, mddev->private);
5373 mddev->private = NULL;
5374 if (pers->sync_request && mddev->to_remove == NULL)
5375 mddev->to_remove = &md_redundancy_group;
5376 module_put(pers->owner);
5377 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5380 void md_stop(struct mddev *mddev)
5382 /* stop the array and free an attached data structures.
5383 * This is called from dm-raid
5386 bitmap_destroy(mddev);
5388 bioset_free(mddev->bio_set);
5391 EXPORT_SYMBOL_GPL(md_stop);
5393 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5398 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5400 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5401 md_wakeup_thread(mddev->thread);
5403 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5404 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5405 if (mddev->sync_thread)
5406 /* Thread might be blocked waiting for metadata update
5407 * which will now never happen */
5408 wake_up_process(mddev->sync_thread->tsk);
5410 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5412 mddev_unlock(mddev);
5413 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5415 wait_event(mddev->sb_wait,
5416 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5417 mddev_lock_nointr(mddev);
5419 mutex_lock(&mddev->open_mutex);
5420 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5421 mddev->sync_thread ||
5422 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5423 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5424 printk("md: %s still in use.\n",mdname(mddev));
5426 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5427 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5428 md_wakeup_thread(mddev->thread);
5434 __md_stop_writes(mddev);
5440 set_disk_ro(mddev->gendisk, 1);
5441 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5442 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5443 md_wakeup_thread(mddev->thread);
5444 sysfs_notify_dirent_safe(mddev->sysfs_state);
5448 mutex_unlock(&mddev->open_mutex);
5453 * 0 - completely stop and dis-assemble array
5454 * 2 - stop but do not disassemble array
5456 static int do_md_stop(struct mddev *mddev, int mode,
5457 struct block_device *bdev)
5459 struct gendisk *disk = mddev->gendisk;
5460 struct md_rdev *rdev;
5463 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5465 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5466 md_wakeup_thread(mddev->thread);
5468 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5469 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5470 if (mddev->sync_thread)
5471 /* Thread might be blocked waiting for metadata update
5472 * which will now never happen */
5473 wake_up_process(mddev->sync_thread->tsk);
5475 mddev_unlock(mddev);
5476 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5477 !test_bit(MD_RECOVERY_RUNNING,
5478 &mddev->recovery)));
5479 mddev_lock_nointr(mddev);
5481 mutex_lock(&mddev->open_mutex);
5482 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5483 mddev->sysfs_active ||
5484 mddev->sync_thread ||
5485 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5486 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5487 printk("md: %s still in use.\n",mdname(mddev));
5488 mutex_unlock(&mddev->open_mutex);
5490 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5491 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5492 md_wakeup_thread(mddev->thread);
5498 set_disk_ro(disk, 0);
5500 __md_stop_writes(mddev);
5502 mddev->queue->backing_dev_info.congested_fn = NULL;
5504 /* tell userspace to handle 'inactive' */
5505 sysfs_notify_dirent_safe(mddev->sysfs_state);
5507 rdev_for_each(rdev, mddev)
5508 if (rdev->raid_disk >= 0)
5509 sysfs_unlink_rdev(mddev, rdev);
5511 set_capacity(disk, 0);
5512 mutex_unlock(&mddev->open_mutex);
5514 revalidate_disk(disk);
5519 mutex_unlock(&mddev->open_mutex);
5521 * Free resources if final stop
5524 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5526 bitmap_destroy(mddev);
5527 if (mddev->bitmap_info.file) {
5528 struct file *f = mddev->bitmap_info.file;
5529 spin_lock(&mddev->lock);
5530 mddev->bitmap_info.file = NULL;
5531 spin_unlock(&mddev->lock);
5534 mddev->bitmap_info.offset = 0;
5536 export_array(mddev);
5539 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5540 if (mddev->hold_active == UNTIL_STOP)
5541 mddev->hold_active = 0;
5543 md_new_event(mddev);
5544 sysfs_notify_dirent_safe(mddev->sysfs_state);
5549 static void autorun_array(struct mddev *mddev)
5551 struct md_rdev *rdev;
5554 if (list_empty(&mddev->disks))
5557 printk(KERN_INFO "md: running: ");
5559 rdev_for_each(rdev, mddev) {
5560 char b[BDEVNAME_SIZE];
5561 printk("<%s>", bdevname(rdev->bdev,b));
5565 err = do_md_run(mddev);
5567 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5568 do_md_stop(mddev, 0, NULL);
5573 * lets try to run arrays based on all disks that have arrived
5574 * until now. (those are in pending_raid_disks)
5576 * the method: pick the first pending disk, collect all disks with
5577 * the same UUID, remove all from the pending list and put them into
5578 * the 'same_array' list. Then order this list based on superblock
5579 * update time (freshest comes first), kick out 'old' disks and
5580 * compare superblocks. If everything's fine then run it.
5582 * If "unit" is allocated, then bump its reference count
5584 static void autorun_devices(int part)
5586 struct md_rdev *rdev0, *rdev, *tmp;
5587 struct mddev *mddev;
5588 char b[BDEVNAME_SIZE];
5590 printk(KERN_INFO "md: autorun ...\n");
5591 while (!list_empty(&pending_raid_disks)) {
5594 LIST_HEAD(candidates);
5595 rdev0 = list_entry(pending_raid_disks.next,
5596 struct md_rdev, same_set);
5598 printk(KERN_INFO "md: considering %s ...\n",
5599 bdevname(rdev0->bdev,b));
5600 INIT_LIST_HEAD(&candidates);
5601 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5602 if (super_90_load(rdev, rdev0, 0) >= 0) {
5603 printk(KERN_INFO "md: adding %s ...\n",
5604 bdevname(rdev->bdev,b));
5605 list_move(&rdev->same_set, &candidates);
5608 * now we have a set of devices, with all of them having
5609 * mostly sane superblocks. It's time to allocate the
5613 dev = MKDEV(mdp_major,
5614 rdev0->preferred_minor << MdpMinorShift);
5615 unit = MINOR(dev) >> MdpMinorShift;
5617 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5620 if (rdev0->preferred_minor != unit) {
5621 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5622 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5626 md_probe(dev, NULL, NULL);
5627 mddev = mddev_find(dev);
5628 if (!mddev || !mddev->gendisk) {
5632 "md: cannot allocate memory for md drive.\n");
5635 if (mddev_lock(mddev))
5636 printk(KERN_WARNING "md: %s locked, cannot run\n",
5638 else if (mddev->raid_disks || mddev->major_version
5639 || !list_empty(&mddev->disks)) {
5641 "md: %s already running, cannot run %s\n",
5642 mdname(mddev), bdevname(rdev0->bdev,b));
5643 mddev_unlock(mddev);
5645 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5646 mddev->persistent = 1;
5647 rdev_for_each_list(rdev, tmp, &candidates) {
5648 list_del_init(&rdev->same_set);
5649 if (bind_rdev_to_array(rdev, mddev))
5652 autorun_array(mddev);
5653 mddev_unlock(mddev);
5655 /* on success, candidates will be empty, on error
5658 rdev_for_each_list(rdev, tmp, &candidates) {
5659 list_del_init(&rdev->same_set);
5664 printk(KERN_INFO "md: ... autorun DONE.\n");
5666 #endif /* !MODULE */
5668 static int get_version(void __user *arg)
5672 ver.major = MD_MAJOR_VERSION;
5673 ver.minor = MD_MINOR_VERSION;
5674 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5676 if (copy_to_user(arg, &ver, sizeof(ver)))
5682 static int get_array_info(struct mddev *mddev, void __user *arg)
5684 mdu_array_info_t info;
5685 int nr,working,insync,failed,spare;
5686 struct md_rdev *rdev;
5688 nr = working = insync = failed = spare = 0;
5690 rdev_for_each_rcu(rdev, mddev) {
5692 if (test_bit(Faulty, &rdev->flags))
5696 if (test_bit(In_sync, &rdev->flags))
5704 info.major_version = mddev->major_version;
5705 info.minor_version = mddev->minor_version;
5706 info.patch_version = MD_PATCHLEVEL_VERSION;
5707 info.ctime = mddev->ctime;
5708 info.level = mddev->level;
5709 info.size = mddev->dev_sectors / 2;
5710 if (info.size != mddev->dev_sectors / 2) /* overflow */
5713 info.raid_disks = mddev->raid_disks;
5714 info.md_minor = mddev->md_minor;
5715 info.not_persistent= !mddev->persistent;
5717 info.utime = mddev->utime;
5720 info.state = (1<<MD_SB_CLEAN);
5721 if (mddev->bitmap && mddev->bitmap_info.offset)
5722 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5723 if (mddev_is_clustered(mddev))
5724 info.state |= (1<<MD_SB_CLUSTERED);
5725 info.active_disks = insync;
5726 info.working_disks = working;
5727 info.failed_disks = failed;
5728 info.spare_disks = spare;
5730 info.layout = mddev->layout;
5731 info.chunk_size = mddev->chunk_sectors << 9;
5733 if (copy_to_user(arg, &info, sizeof(info)))
5739 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5741 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5745 file = kzalloc(sizeof(*file), GFP_NOIO);
5750 spin_lock(&mddev->lock);
5751 /* bitmap enabled */
5752 if (mddev->bitmap_info.file) {
5753 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5754 sizeof(file->pathname));
5758 memmove(file->pathname, ptr,
5759 sizeof(file->pathname)-(ptr-file->pathname));
5761 spin_unlock(&mddev->lock);
5764 copy_to_user(arg, file, sizeof(*file)))
5771 static int get_disk_info(struct mddev *mddev, void __user * arg)
5773 mdu_disk_info_t info;
5774 struct md_rdev *rdev;
5776 if (copy_from_user(&info, arg, sizeof(info)))
5780 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5782 info.major = MAJOR(rdev->bdev->bd_dev);
5783 info.minor = MINOR(rdev->bdev->bd_dev);
5784 info.raid_disk = rdev->raid_disk;
5786 if (test_bit(Faulty, &rdev->flags))
5787 info.state |= (1<<MD_DISK_FAULTY);
5788 else if (test_bit(In_sync, &rdev->flags)) {
5789 info.state |= (1<<MD_DISK_ACTIVE);
5790 info.state |= (1<<MD_DISK_SYNC);
5792 if (test_bit(WriteMostly, &rdev->flags))
5793 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5795 info.major = info.minor = 0;
5796 info.raid_disk = -1;
5797 info.state = (1<<MD_DISK_REMOVED);
5801 if (copy_to_user(arg, &info, sizeof(info)))
5807 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5809 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5810 struct md_rdev *rdev;
5811 dev_t dev = MKDEV(info->major,info->minor);
5813 if (mddev_is_clustered(mddev) &&
5814 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5815 pr_err("%s: Cannot add to clustered mddev.\n",
5820 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5823 if (!mddev->raid_disks) {
5825 /* expecting a device which has a superblock */
5826 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5829 "md: md_import_device returned %ld\n",
5831 return PTR_ERR(rdev);
5833 if (!list_empty(&mddev->disks)) {
5834 struct md_rdev *rdev0
5835 = list_entry(mddev->disks.next,
5836 struct md_rdev, same_set);
5837 err = super_types[mddev->major_version]
5838 .load_super(rdev, rdev0, mddev->minor_version);
5841 "md: %s has different UUID to %s\n",
5842 bdevname(rdev->bdev,b),
5843 bdevname(rdev0->bdev,b2));
5848 err = bind_rdev_to_array(rdev, mddev);
5855 * add_new_disk can be used once the array is assembled
5856 * to add "hot spares". They must already have a superblock
5861 if (!mddev->pers->hot_add_disk) {
5863 "%s: personality does not support diskops!\n",
5867 if (mddev->persistent)
5868 rdev = md_import_device(dev, mddev->major_version,
5869 mddev->minor_version);
5871 rdev = md_import_device(dev, -1, -1);
5874 "md: md_import_device returned %ld\n",
5876 return PTR_ERR(rdev);
5878 /* set saved_raid_disk if appropriate */
5879 if (!mddev->persistent) {
5880 if (info->state & (1<<MD_DISK_SYNC) &&
5881 info->raid_disk < mddev->raid_disks) {
5882 rdev->raid_disk = info->raid_disk;
5883 set_bit(In_sync, &rdev->flags);
5884 clear_bit(Bitmap_sync, &rdev->flags);
5886 rdev->raid_disk = -1;
5887 rdev->saved_raid_disk = rdev->raid_disk;
5889 super_types[mddev->major_version].
5890 validate_super(mddev, rdev);
5891 if ((info->state & (1<<MD_DISK_SYNC)) &&
5892 rdev->raid_disk != info->raid_disk) {
5893 /* This was a hot-add request, but events doesn't
5894 * match, so reject it.
5900 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5901 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5902 set_bit(WriteMostly, &rdev->flags);
5904 clear_bit(WriteMostly, &rdev->flags);
5907 * check whether the device shows up in other nodes
5909 if (mddev_is_clustered(mddev)) {
5910 if (info->state & (1 << MD_DISK_CANDIDATE)) {
5911 /* Through --cluster-confirm */
5912 set_bit(Candidate, &rdev->flags);
5913 err = md_cluster_ops->new_disk_ack(mddev, true);
5918 } else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
5919 /* --add initiated by this node */
5920 err = md_cluster_ops->add_new_disk_start(mddev, rdev);
5922 md_cluster_ops->add_new_disk_finish(mddev);
5929 rdev->raid_disk = -1;
5930 err = bind_rdev_to_array(rdev, mddev);
5934 err = add_bound_rdev(rdev);
5935 if (mddev_is_clustered(mddev) &&
5936 (info->state & (1 << MD_DISK_CLUSTER_ADD)))
5937 md_cluster_ops->add_new_disk_finish(mddev);
5941 /* otherwise, add_new_disk is only allowed
5942 * for major_version==0 superblocks
5944 if (mddev->major_version != 0) {
5945 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5950 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5952 rdev = md_import_device(dev, -1, 0);
5955 "md: error, md_import_device() returned %ld\n",
5957 return PTR_ERR(rdev);
5959 rdev->desc_nr = info->number;
5960 if (info->raid_disk < mddev->raid_disks)
5961 rdev->raid_disk = info->raid_disk;
5963 rdev->raid_disk = -1;
5965 if (rdev->raid_disk < mddev->raid_disks)
5966 if (info->state & (1<<MD_DISK_SYNC))
5967 set_bit(In_sync, &rdev->flags);
5969 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5970 set_bit(WriteMostly, &rdev->flags);
5972 if (!mddev->persistent) {
5973 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5974 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5976 rdev->sb_start = calc_dev_sboffset(rdev);
5977 rdev->sectors = rdev->sb_start;
5979 err = bind_rdev_to_array(rdev, mddev);
5989 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
5991 char b[BDEVNAME_SIZE];
5992 struct md_rdev *rdev;
5994 rdev = find_rdev(mddev, dev);
5998 if (mddev_is_clustered(mddev))
5999 md_cluster_ops->metadata_update_start(mddev);
6001 clear_bit(Blocked, &rdev->flags);
6002 remove_and_add_spares(mddev, rdev);
6004 if (rdev->raid_disk >= 0)
6007 if (mddev_is_clustered(mddev))
6008 md_cluster_ops->remove_disk(mddev, rdev);
6010 md_kick_rdev_from_array(rdev);
6011 md_update_sb(mddev, 1);
6012 md_new_event(mddev);
6014 if (mddev_is_clustered(mddev))
6015 md_cluster_ops->metadata_update_finish(mddev);
6019 if (mddev_is_clustered(mddev))
6020 md_cluster_ops->metadata_update_cancel(mddev);
6021 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6022 bdevname(rdev->bdev,b), mdname(mddev));
6026 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6028 char b[BDEVNAME_SIZE];
6030 struct md_rdev *rdev;
6035 if (mddev->major_version != 0) {
6036 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6037 " version-0 superblocks.\n",
6041 if (!mddev->pers->hot_add_disk) {
6043 "%s: personality does not support diskops!\n",
6048 rdev = md_import_device(dev, -1, 0);
6051 "md: error, md_import_device() returned %ld\n",
6056 if (mddev->persistent)
6057 rdev->sb_start = calc_dev_sboffset(rdev);
6059 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6061 rdev->sectors = rdev->sb_start;
6063 if (test_bit(Faulty, &rdev->flags)) {
6065 "md: can not hot-add faulty %s disk to %s!\n",
6066 bdevname(rdev->bdev,b), mdname(mddev));
6071 if (mddev_is_clustered(mddev))
6072 md_cluster_ops->metadata_update_start(mddev);
6073 clear_bit(In_sync, &rdev->flags);
6075 rdev->saved_raid_disk = -1;
6076 err = bind_rdev_to_array(rdev, mddev);
6078 goto abort_clustered;
6081 * The rest should better be atomic, we can have disk failures
6082 * noticed in interrupt contexts ...
6085 rdev->raid_disk = -1;
6087 md_update_sb(mddev, 1);
6089 if (mddev_is_clustered(mddev))
6090 md_cluster_ops->metadata_update_finish(mddev);
6092 * Kick recovery, maybe this spare has to be added to the
6093 * array immediately.
6095 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6096 md_wakeup_thread(mddev->thread);
6097 md_new_event(mddev);
6101 if (mddev_is_clustered(mddev))
6102 md_cluster_ops->metadata_update_cancel(mddev);
6108 static int set_bitmap_file(struct mddev *mddev, int fd)
6113 if (!mddev->pers->quiesce || !mddev->thread)
6115 if (mddev->recovery || mddev->sync_thread)
6117 /* we should be able to change the bitmap.. */
6121 struct inode *inode;
6124 if (mddev->bitmap || mddev->bitmap_info.file)
6125 return -EEXIST; /* cannot add when bitmap is present */
6129 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6134 inode = f->f_mapping->host;
6135 if (!S_ISREG(inode->i_mode)) {
6136 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6139 } else if (!(f->f_mode & FMODE_WRITE)) {
6140 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6143 } else if (atomic_read(&inode->i_writecount) != 1) {
6144 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6152 mddev->bitmap_info.file = f;
6153 mddev->bitmap_info.offset = 0; /* file overrides offset */
6154 } else if (mddev->bitmap == NULL)
6155 return -ENOENT; /* cannot remove what isn't there */
6158 mddev->pers->quiesce(mddev, 1);
6160 struct bitmap *bitmap;
6162 bitmap = bitmap_create(mddev, -1);
6163 if (!IS_ERR(bitmap)) {
6164 mddev->bitmap = bitmap;
6165 err = bitmap_load(mddev);
6167 err = PTR_ERR(bitmap);
6169 if (fd < 0 || err) {
6170 bitmap_destroy(mddev);
6171 fd = -1; /* make sure to put the file */
6173 mddev->pers->quiesce(mddev, 0);
6176 struct file *f = mddev->bitmap_info.file;
6178 spin_lock(&mddev->lock);
6179 mddev->bitmap_info.file = NULL;
6180 spin_unlock(&mddev->lock);
6189 * set_array_info is used two different ways
6190 * The original usage is when creating a new array.
6191 * In this usage, raid_disks is > 0 and it together with
6192 * level, size, not_persistent,layout,chunksize determine the
6193 * shape of the array.
6194 * This will always create an array with a type-0.90.0 superblock.
6195 * The newer usage is when assembling an array.
6196 * In this case raid_disks will be 0, and the major_version field is
6197 * use to determine which style super-blocks are to be found on the devices.
6198 * The minor and patch _version numbers are also kept incase the
6199 * super_block handler wishes to interpret them.
6201 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6204 if (info->raid_disks == 0) {
6205 /* just setting version number for superblock loading */
6206 if (info->major_version < 0 ||
6207 info->major_version >= ARRAY_SIZE(super_types) ||
6208 super_types[info->major_version].name == NULL) {
6209 /* maybe try to auto-load a module? */
6211 "md: superblock version %d not known\n",
6212 info->major_version);
6215 mddev->major_version = info->major_version;
6216 mddev->minor_version = info->minor_version;
6217 mddev->patch_version = info->patch_version;
6218 mddev->persistent = !info->not_persistent;
6219 /* ensure mddev_put doesn't delete this now that there
6220 * is some minimal configuration.
6222 mddev->ctime = get_seconds();
6225 mddev->major_version = MD_MAJOR_VERSION;
6226 mddev->minor_version = MD_MINOR_VERSION;
6227 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6228 mddev->ctime = get_seconds();
6230 mddev->level = info->level;
6231 mddev->clevel[0] = 0;
6232 mddev->dev_sectors = 2 * (sector_t)info->size;
6233 mddev->raid_disks = info->raid_disks;
6234 /* don't set md_minor, it is determined by which /dev/md* was
6237 if (info->state & (1<<MD_SB_CLEAN))
6238 mddev->recovery_cp = MaxSector;
6240 mddev->recovery_cp = 0;
6241 mddev->persistent = ! info->not_persistent;
6242 mddev->external = 0;
6244 mddev->layout = info->layout;
6245 mddev->chunk_sectors = info->chunk_size >> 9;
6247 mddev->max_disks = MD_SB_DISKS;
6249 if (mddev->persistent)
6251 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6253 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6254 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6255 mddev->bitmap_info.offset = 0;
6257 mddev->reshape_position = MaxSector;
6260 * Generate a 128 bit UUID
6262 get_random_bytes(mddev->uuid, 16);
6264 mddev->new_level = mddev->level;
6265 mddev->new_chunk_sectors = mddev->chunk_sectors;
6266 mddev->new_layout = mddev->layout;
6267 mddev->delta_disks = 0;
6268 mddev->reshape_backwards = 0;
6273 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6275 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6277 if (mddev->external_size)
6280 mddev->array_sectors = array_sectors;
6282 EXPORT_SYMBOL(md_set_array_sectors);
6284 static int update_size(struct mddev *mddev, sector_t num_sectors)
6286 struct md_rdev *rdev;
6288 int fit = (num_sectors == 0);
6290 if (mddev->pers->resize == NULL)
6292 /* The "num_sectors" is the number of sectors of each device that
6293 * is used. This can only make sense for arrays with redundancy.
6294 * linear and raid0 always use whatever space is available. We can only
6295 * consider changing this number if no resync or reconstruction is
6296 * happening, and if the new size is acceptable. It must fit before the
6297 * sb_start or, if that is <data_offset, it must fit before the size
6298 * of each device. If num_sectors is zero, we find the largest size
6301 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6307 rdev_for_each(rdev, mddev) {
6308 sector_t avail = rdev->sectors;
6310 if (fit && (num_sectors == 0 || num_sectors > avail))
6311 num_sectors = avail;
6312 if (avail < num_sectors)
6315 rv = mddev->pers->resize(mddev, num_sectors);
6317 revalidate_disk(mddev->gendisk);
6321 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6324 struct md_rdev *rdev;
6325 /* change the number of raid disks */
6326 if (mddev->pers->check_reshape == NULL)
6330 if (raid_disks <= 0 ||
6331 (mddev->max_disks && raid_disks >= mddev->max_disks))
6333 if (mddev->sync_thread ||
6334 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6335 mddev->reshape_position != MaxSector)
6338 rdev_for_each(rdev, mddev) {
6339 if (mddev->raid_disks < raid_disks &&
6340 rdev->data_offset < rdev->new_data_offset)
6342 if (mddev->raid_disks > raid_disks &&
6343 rdev->data_offset > rdev->new_data_offset)
6347 mddev->delta_disks = raid_disks - mddev->raid_disks;
6348 if (mddev->delta_disks < 0)
6349 mddev->reshape_backwards = 1;
6350 else if (mddev->delta_disks > 0)
6351 mddev->reshape_backwards = 0;
6353 rv = mddev->pers->check_reshape(mddev);
6355 mddev->delta_disks = 0;
6356 mddev->reshape_backwards = 0;
6362 * update_array_info is used to change the configuration of an
6364 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6365 * fields in the info are checked against the array.
6366 * Any differences that cannot be handled will cause an error.
6367 * Normally, only one change can be managed at a time.
6369 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6375 /* calculate expected state,ignoring low bits */
6376 if (mddev->bitmap && mddev->bitmap_info.offset)
6377 state |= (1 << MD_SB_BITMAP_PRESENT);
6379 if (mddev->major_version != info->major_version ||
6380 mddev->minor_version != info->minor_version ||
6381 /* mddev->patch_version != info->patch_version || */
6382 mddev->ctime != info->ctime ||
6383 mddev->level != info->level ||
6384 /* mddev->layout != info->layout || */
6385 mddev->persistent != !info->not_persistent ||
6386 mddev->chunk_sectors != info->chunk_size >> 9 ||
6387 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6388 ((state^info->state) & 0xfffffe00)
6391 /* Check there is only one change */
6392 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6394 if (mddev->raid_disks != info->raid_disks)
6396 if (mddev->layout != info->layout)
6398 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6405 if (mddev->layout != info->layout) {
6407 * we don't need to do anything at the md level, the
6408 * personality will take care of it all.
6410 if (mddev->pers->check_reshape == NULL)
6413 mddev->new_layout = info->layout;
6414 rv = mddev->pers->check_reshape(mddev);
6416 mddev->new_layout = mddev->layout;
6420 if (mddev_is_clustered(mddev))
6421 md_cluster_ops->metadata_update_start(mddev);
6422 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6423 rv = update_size(mddev, (sector_t)info->size * 2);
6425 if (mddev->raid_disks != info->raid_disks)
6426 rv = update_raid_disks(mddev, info->raid_disks);
6428 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6429 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6433 if (mddev->recovery || mddev->sync_thread) {
6437 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6438 struct bitmap *bitmap;
6439 /* add the bitmap */
6440 if (mddev->bitmap) {
6444 if (mddev->bitmap_info.default_offset == 0) {
6448 mddev->bitmap_info.offset =
6449 mddev->bitmap_info.default_offset;
6450 mddev->bitmap_info.space =
6451 mddev->bitmap_info.default_space;
6452 mddev->pers->quiesce(mddev, 1);
6453 bitmap = bitmap_create(mddev, -1);
6454 if (!IS_ERR(bitmap)) {
6455 mddev->bitmap = bitmap;
6456 rv = bitmap_load(mddev);
6458 rv = PTR_ERR(bitmap);
6460 bitmap_destroy(mddev);
6461 mddev->pers->quiesce(mddev, 0);
6463 /* remove the bitmap */
6464 if (!mddev->bitmap) {
6468 if (mddev->bitmap->storage.file) {
6472 mddev->pers->quiesce(mddev, 1);
6473 bitmap_destroy(mddev);
6474 mddev->pers->quiesce(mddev, 0);
6475 mddev->bitmap_info.offset = 0;
6478 md_update_sb(mddev, 1);
6479 if (mddev_is_clustered(mddev))
6480 md_cluster_ops->metadata_update_finish(mddev);
6483 if (mddev_is_clustered(mddev))
6484 md_cluster_ops->metadata_update_cancel(mddev);
6488 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6490 struct md_rdev *rdev;
6493 if (mddev->pers == NULL)
6497 rdev = find_rdev_rcu(mddev, dev);
6501 md_error(mddev, rdev);
6502 if (!test_bit(Faulty, &rdev->flags))
6510 * We have a problem here : there is no easy way to give a CHS
6511 * virtual geometry. We currently pretend that we have a 2 heads
6512 * 4 sectors (with a BIG number of cylinders...). This drives
6513 * dosfs just mad... ;-)
6515 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6517 struct mddev *mddev = bdev->bd_disk->private_data;
6521 geo->cylinders = mddev->array_sectors / 8;
6525 static inline bool md_ioctl_valid(unsigned int cmd)
6530 case GET_ARRAY_INFO:
6531 case GET_BITMAP_FILE:
6534 case HOT_REMOVE_DISK:
6537 case RESTART_ARRAY_RW:
6539 case SET_ARRAY_INFO:
6540 case SET_BITMAP_FILE:
6541 case SET_DISK_FAULTY:
6544 case CLUSTERED_DISK_NACK:
6551 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6552 unsigned int cmd, unsigned long arg)
6555 void __user *argp = (void __user *)arg;
6556 struct mddev *mddev = NULL;
6559 if (!md_ioctl_valid(cmd))
6564 case GET_ARRAY_INFO:
6568 if (!capable(CAP_SYS_ADMIN))
6573 * Commands dealing with the RAID driver but not any
6578 err = get_version(argp);
6584 autostart_arrays(arg);
6591 * Commands creating/starting a new array:
6594 mddev = bdev->bd_disk->private_data;
6601 /* Some actions do not requires the mutex */
6603 case GET_ARRAY_INFO:
6604 if (!mddev->raid_disks && !mddev->external)
6607 err = get_array_info(mddev, argp);
6611 if (!mddev->raid_disks && !mddev->external)
6614 err = get_disk_info(mddev, argp);
6617 case SET_DISK_FAULTY:
6618 err = set_disk_faulty(mddev, new_decode_dev(arg));
6621 case GET_BITMAP_FILE:
6622 err = get_bitmap_file(mddev, argp);
6627 if (cmd == ADD_NEW_DISK)
6628 /* need to ensure md_delayed_delete() has completed */
6629 flush_workqueue(md_misc_wq);
6631 if (cmd == HOT_REMOVE_DISK)
6632 /* need to ensure recovery thread has run */
6633 wait_event_interruptible_timeout(mddev->sb_wait,
6634 !test_bit(MD_RECOVERY_NEEDED,
6636 msecs_to_jiffies(5000));
6637 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6638 /* Need to flush page cache, and ensure no-one else opens
6641 mutex_lock(&mddev->open_mutex);
6642 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6643 mutex_unlock(&mddev->open_mutex);
6647 set_bit(MD_STILL_CLOSED, &mddev->flags);
6648 mutex_unlock(&mddev->open_mutex);
6649 sync_blockdev(bdev);
6651 err = mddev_lock(mddev);
6654 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6659 if (cmd == SET_ARRAY_INFO) {
6660 mdu_array_info_t info;
6662 memset(&info, 0, sizeof(info));
6663 else if (copy_from_user(&info, argp, sizeof(info))) {
6668 err = update_array_info(mddev, &info);
6670 printk(KERN_WARNING "md: couldn't update"
6671 " array info. %d\n", err);
6676 if (!list_empty(&mddev->disks)) {
6678 "md: array %s already has disks!\n",
6683 if (mddev->raid_disks) {
6685 "md: array %s already initialised!\n",
6690 err = set_array_info(mddev, &info);
6692 printk(KERN_WARNING "md: couldn't set"
6693 " array info. %d\n", err);
6700 * Commands querying/configuring an existing array:
6702 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6703 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6704 if ((!mddev->raid_disks && !mddev->external)
6705 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6706 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6707 && cmd != GET_BITMAP_FILE) {
6713 * Commands even a read-only array can execute:
6716 case RESTART_ARRAY_RW:
6717 err = restart_array(mddev);
6721 err = do_md_stop(mddev, 0, bdev);
6725 err = md_set_readonly(mddev, bdev);
6728 case HOT_REMOVE_DISK:
6729 err = hot_remove_disk(mddev, new_decode_dev(arg));
6733 /* We can support ADD_NEW_DISK on read-only arrays
6734 * on if we are re-adding a preexisting device.
6735 * So require mddev->pers and MD_DISK_SYNC.
6738 mdu_disk_info_t info;
6739 if (copy_from_user(&info, argp, sizeof(info)))
6741 else if (!(info.state & (1<<MD_DISK_SYNC)))
6742 /* Need to clear read-only for this */
6745 err = add_new_disk(mddev, &info);
6751 if (get_user(ro, (int __user *)(arg))) {
6757 /* if the bdev is going readonly the value of mddev->ro
6758 * does not matter, no writes are coming
6763 /* are we are already prepared for writes? */
6767 /* transitioning to readauto need only happen for
6768 * arrays that call md_write_start
6771 err = restart_array(mddev);
6774 set_disk_ro(mddev->gendisk, 0);
6781 * The remaining ioctls are changing the state of the
6782 * superblock, so we do not allow them on read-only arrays.
6784 if (mddev->ro && mddev->pers) {
6785 if (mddev->ro == 2) {
6787 sysfs_notify_dirent_safe(mddev->sysfs_state);
6788 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6789 /* mddev_unlock will wake thread */
6790 /* If a device failed while we were read-only, we
6791 * need to make sure the metadata is updated now.
6793 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6794 mddev_unlock(mddev);
6795 wait_event(mddev->sb_wait,
6796 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6797 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6798 mddev_lock_nointr(mddev);
6809 mdu_disk_info_t info;
6810 if (copy_from_user(&info, argp, sizeof(info)))
6813 err = add_new_disk(mddev, &info);
6817 case CLUSTERED_DISK_NACK:
6818 if (mddev_is_clustered(mddev))
6819 md_cluster_ops->new_disk_ack(mddev, false);
6825 err = hot_add_disk(mddev, new_decode_dev(arg));
6829 err = do_md_run(mddev);
6832 case SET_BITMAP_FILE:
6833 err = set_bitmap_file(mddev, (int)arg);
6842 if (mddev->hold_active == UNTIL_IOCTL &&
6844 mddev->hold_active = 0;
6845 mddev_unlock(mddev);
6849 #ifdef CONFIG_COMPAT
6850 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6851 unsigned int cmd, unsigned long arg)
6854 case HOT_REMOVE_DISK:
6856 case SET_DISK_FAULTY:
6857 case SET_BITMAP_FILE:
6858 /* These take in integer arg, do not convert */
6861 arg = (unsigned long)compat_ptr(arg);
6865 return md_ioctl(bdev, mode, cmd, arg);
6867 #endif /* CONFIG_COMPAT */
6869 static int md_open(struct block_device *bdev, fmode_t mode)
6872 * Succeed if we can lock the mddev, which confirms that
6873 * it isn't being stopped right now.
6875 struct mddev *mddev = mddev_find(bdev->bd_dev);
6881 if (mddev->gendisk != bdev->bd_disk) {
6882 /* we are racing with mddev_put which is discarding this
6886 /* Wait until bdev->bd_disk is definitely gone */
6887 flush_workqueue(md_misc_wq);
6888 /* Then retry the open from the top */
6889 return -ERESTARTSYS;
6891 BUG_ON(mddev != bdev->bd_disk->private_data);
6893 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6897 atomic_inc(&mddev->openers);
6898 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6899 mutex_unlock(&mddev->open_mutex);
6901 check_disk_change(bdev);
6906 static void md_release(struct gendisk *disk, fmode_t mode)
6908 struct mddev *mddev = disk->private_data;
6911 atomic_dec(&mddev->openers);
6915 static int md_media_changed(struct gendisk *disk)
6917 struct mddev *mddev = disk->private_data;
6919 return mddev->changed;
6922 static int md_revalidate(struct gendisk *disk)
6924 struct mddev *mddev = disk->private_data;
6929 static const struct block_device_operations md_fops =
6931 .owner = THIS_MODULE,
6933 .release = md_release,
6935 #ifdef CONFIG_COMPAT
6936 .compat_ioctl = md_compat_ioctl,
6938 .getgeo = md_getgeo,
6939 .media_changed = md_media_changed,
6940 .revalidate_disk= md_revalidate,
6943 static int md_thread(void *arg)
6945 struct md_thread *thread = arg;
6948 * md_thread is a 'system-thread', it's priority should be very
6949 * high. We avoid resource deadlocks individually in each
6950 * raid personality. (RAID5 does preallocation) We also use RR and
6951 * the very same RT priority as kswapd, thus we will never get
6952 * into a priority inversion deadlock.
6954 * we definitely have to have equal or higher priority than
6955 * bdflush, otherwise bdflush will deadlock if there are too
6956 * many dirty RAID5 blocks.
6959 allow_signal(SIGKILL);
6960 while (!kthread_should_stop()) {
6962 /* We need to wait INTERRUPTIBLE so that
6963 * we don't add to the load-average.
6964 * That means we need to be sure no signals are
6967 if (signal_pending(current))
6968 flush_signals(current);
6970 wait_event_interruptible_timeout
6972 test_bit(THREAD_WAKEUP, &thread->flags)
6973 || kthread_should_stop(),
6976 clear_bit(THREAD_WAKEUP, &thread->flags);
6977 if (!kthread_should_stop())
6978 thread->run(thread);
6984 void md_wakeup_thread(struct md_thread *thread)
6987 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6988 set_bit(THREAD_WAKEUP, &thread->flags);
6989 wake_up(&thread->wqueue);
6992 EXPORT_SYMBOL(md_wakeup_thread);
6994 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6995 struct mddev *mddev, const char *name)
6997 struct md_thread *thread;
6999 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7003 init_waitqueue_head(&thread->wqueue);
7006 thread->mddev = mddev;
7007 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7008 thread->tsk = kthread_run(md_thread, thread,
7010 mdname(thread->mddev),
7012 if (IS_ERR(thread->tsk)) {
7018 EXPORT_SYMBOL(md_register_thread);
7020 void md_unregister_thread(struct md_thread **threadp)
7022 struct md_thread *thread = *threadp;
7025 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7026 /* Locking ensures that mddev_unlock does not wake_up a
7027 * non-existent thread
7029 spin_lock(&pers_lock);
7031 spin_unlock(&pers_lock);
7033 kthread_stop(thread->tsk);
7036 EXPORT_SYMBOL(md_unregister_thread);
7038 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7040 if (!rdev || test_bit(Faulty, &rdev->flags))
7043 if (!mddev->pers || !mddev->pers->error_handler)
7045 mddev->pers->error_handler(mddev,rdev);
7046 if (mddev->degraded)
7047 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7048 sysfs_notify_dirent_safe(rdev->sysfs_state);
7049 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7050 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7051 md_wakeup_thread(mddev->thread);
7052 if (mddev->event_work.func)
7053 queue_work(md_misc_wq, &mddev->event_work);
7054 md_new_event_inintr(mddev);
7056 EXPORT_SYMBOL(md_error);
7058 /* seq_file implementation /proc/mdstat */
7060 static void status_unused(struct seq_file *seq)
7063 struct md_rdev *rdev;
7065 seq_printf(seq, "unused devices: ");
7067 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7068 char b[BDEVNAME_SIZE];
7070 seq_printf(seq, "%s ",
7071 bdevname(rdev->bdev,b));
7074 seq_printf(seq, "<none>");
7076 seq_printf(seq, "\n");
7079 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7081 sector_t max_sectors, resync, res;
7082 unsigned long dt, db;
7085 unsigned int per_milli;
7087 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7088 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7089 max_sectors = mddev->resync_max_sectors;
7091 max_sectors = mddev->dev_sectors;
7093 resync = mddev->curr_resync;
7095 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7096 /* Still cleaning up */
7097 resync = max_sectors;
7099 resync -= atomic_read(&mddev->recovery_active);
7102 if (mddev->recovery_cp < MaxSector) {
7103 seq_printf(seq, "\tresync=PENDING");
7109 seq_printf(seq, "\tresync=DELAYED");
7113 WARN_ON(max_sectors == 0);
7114 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7115 * in a sector_t, and (max_sectors>>scale) will fit in a
7116 * u32, as those are the requirements for sector_div.
7117 * Thus 'scale' must be at least 10
7120 if (sizeof(sector_t) > sizeof(unsigned long)) {
7121 while ( max_sectors/2 > (1ULL<<(scale+32)))
7124 res = (resync>>scale)*1000;
7125 sector_div(res, (u32)((max_sectors>>scale)+1));
7129 int i, x = per_milli/50, y = 20-x;
7130 seq_printf(seq, "[");
7131 for (i = 0; i < x; i++)
7132 seq_printf(seq, "=");
7133 seq_printf(seq, ">");
7134 for (i = 0; i < y; i++)
7135 seq_printf(seq, ".");
7136 seq_printf(seq, "] ");
7138 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7139 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7141 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7143 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7144 "resync" : "recovery"))),
7145 per_milli/10, per_milli % 10,
7146 (unsigned long long) resync/2,
7147 (unsigned long long) max_sectors/2);
7150 * dt: time from mark until now
7151 * db: blocks written from mark until now
7152 * rt: remaining time
7154 * rt is a sector_t, so could be 32bit or 64bit.
7155 * So we divide before multiply in case it is 32bit and close
7157 * We scale the divisor (db) by 32 to avoid losing precision
7158 * near the end of resync when the number of remaining sectors
7160 * We then divide rt by 32 after multiplying by db to compensate.
7161 * The '+1' avoids division by zero if db is very small.
7163 dt = ((jiffies - mddev->resync_mark) / HZ);
7165 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7166 - mddev->resync_mark_cnt;
7168 rt = max_sectors - resync; /* number of remaining sectors */
7169 sector_div(rt, db/32+1);
7173 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7174 ((unsigned long)rt % 60)/6);
7176 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7180 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7182 struct list_head *tmp;
7184 struct mddev *mddev;
7192 spin_lock(&all_mddevs_lock);
7193 list_for_each(tmp,&all_mddevs)
7195 mddev = list_entry(tmp, struct mddev, all_mddevs);
7197 spin_unlock(&all_mddevs_lock);
7200 spin_unlock(&all_mddevs_lock);
7202 return (void*)2;/* tail */
7206 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7208 struct list_head *tmp;
7209 struct mddev *next_mddev, *mddev = v;
7215 spin_lock(&all_mddevs_lock);
7217 tmp = all_mddevs.next;
7219 tmp = mddev->all_mddevs.next;
7220 if (tmp != &all_mddevs)
7221 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7223 next_mddev = (void*)2;
7226 spin_unlock(&all_mddevs_lock);
7234 static void md_seq_stop(struct seq_file *seq, void *v)
7236 struct mddev *mddev = v;
7238 if (mddev && v != (void*)1 && v != (void*)2)
7242 static int md_seq_show(struct seq_file *seq, void *v)
7244 struct mddev *mddev = v;
7246 struct md_rdev *rdev;
7248 if (v == (void*)1) {
7249 struct md_personality *pers;
7250 seq_printf(seq, "Personalities : ");
7251 spin_lock(&pers_lock);
7252 list_for_each_entry(pers, &pers_list, list)
7253 seq_printf(seq, "[%s] ", pers->name);
7255 spin_unlock(&pers_lock);
7256 seq_printf(seq, "\n");
7257 seq->poll_event = atomic_read(&md_event_count);
7260 if (v == (void*)2) {
7265 spin_lock(&mddev->lock);
7266 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7267 seq_printf(seq, "%s : %sactive", mdname(mddev),
7268 mddev->pers ? "" : "in");
7271 seq_printf(seq, " (read-only)");
7273 seq_printf(seq, " (auto-read-only)");
7274 seq_printf(seq, " %s", mddev->pers->name);
7279 rdev_for_each_rcu(rdev, mddev) {
7280 char b[BDEVNAME_SIZE];
7281 seq_printf(seq, " %s[%d]",
7282 bdevname(rdev->bdev,b), rdev->desc_nr);
7283 if (test_bit(WriteMostly, &rdev->flags))
7284 seq_printf(seq, "(W)");
7285 if (test_bit(Faulty, &rdev->flags)) {
7286 seq_printf(seq, "(F)");
7289 if (rdev->raid_disk < 0)
7290 seq_printf(seq, "(S)"); /* spare */
7291 if (test_bit(Replacement, &rdev->flags))
7292 seq_printf(seq, "(R)");
7293 sectors += rdev->sectors;
7297 if (!list_empty(&mddev->disks)) {
7299 seq_printf(seq, "\n %llu blocks",
7300 (unsigned long long)
7301 mddev->array_sectors / 2);
7303 seq_printf(seq, "\n %llu blocks",
7304 (unsigned long long)sectors / 2);
7306 if (mddev->persistent) {
7307 if (mddev->major_version != 0 ||
7308 mddev->minor_version != 90) {
7309 seq_printf(seq," super %d.%d",
7310 mddev->major_version,
7311 mddev->minor_version);
7313 } else if (mddev->external)
7314 seq_printf(seq, " super external:%s",
7315 mddev->metadata_type);
7317 seq_printf(seq, " super non-persistent");
7320 mddev->pers->status(seq, mddev);
7321 seq_printf(seq, "\n ");
7322 if (mddev->pers->sync_request) {
7323 if (status_resync(seq, mddev))
7324 seq_printf(seq, "\n ");
7327 seq_printf(seq, "\n ");
7329 bitmap_status(seq, mddev->bitmap);
7331 seq_printf(seq, "\n");
7333 spin_unlock(&mddev->lock);
7338 static const struct seq_operations md_seq_ops = {
7339 .start = md_seq_start,
7340 .next = md_seq_next,
7341 .stop = md_seq_stop,
7342 .show = md_seq_show,
7345 static int md_seq_open(struct inode *inode, struct file *file)
7347 struct seq_file *seq;
7350 error = seq_open(file, &md_seq_ops);
7354 seq = file->private_data;
7355 seq->poll_event = atomic_read(&md_event_count);
7359 static int md_unloading;
7360 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7362 struct seq_file *seq = filp->private_data;
7366 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7367 poll_wait(filp, &md_event_waiters, wait);
7369 /* always allow read */
7370 mask = POLLIN | POLLRDNORM;
7372 if (seq->poll_event != atomic_read(&md_event_count))
7373 mask |= POLLERR | POLLPRI;
7377 static const struct file_operations md_seq_fops = {
7378 .owner = THIS_MODULE,
7379 .open = md_seq_open,
7381 .llseek = seq_lseek,
7382 .release = seq_release_private,
7383 .poll = mdstat_poll,
7386 int register_md_personality(struct md_personality *p)
7388 printk(KERN_INFO "md: %s personality registered for level %d\n",
7390 spin_lock(&pers_lock);
7391 list_add_tail(&p->list, &pers_list);
7392 spin_unlock(&pers_lock);
7395 EXPORT_SYMBOL(register_md_personality);
7397 int unregister_md_personality(struct md_personality *p)
7399 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7400 spin_lock(&pers_lock);
7401 list_del_init(&p->list);
7402 spin_unlock(&pers_lock);
7405 EXPORT_SYMBOL(unregister_md_personality);
7407 int register_md_cluster_operations(struct md_cluster_operations *ops,
7408 struct module *module)
7411 spin_lock(&pers_lock);
7412 if (md_cluster_ops != NULL)
7415 md_cluster_ops = ops;
7416 md_cluster_mod = module;
7418 spin_unlock(&pers_lock);
7421 EXPORT_SYMBOL(register_md_cluster_operations);
7423 int unregister_md_cluster_operations(void)
7425 spin_lock(&pers_lock);
7426 md_cluster_ops = NULL;
7427 spin_unlock(&pers_lock);
7430 EXPORT_SYMBOL(unregister_md_cluster_operations);
7432 int md_setup_cluster(struct mddev *mddev, int nodes)
7436 err = request_module("md-cluster");
7438 pr_err("md-cluster module not found.\n");
7442 spin_lock(&pers_lock);
7443 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7444 spin_unlock(&pers_lock);
7447 spin_unlock(&pers_lock);
7449 return md_cluster_ops->join(mddev, nodes);
7452 void md_cluster_stop(struct mddev *mddev)
7454 if (!md_cluster_ops)
7456 md_cluster_ops->leave(mddev);
7457 module_put(md_cluster_mod);
7460 static int is_mddev_idle(struct mddev *mddev, int init)
7462 struct md_rdev *rdev;
7468 rdev_for_each_rcu(rdev, mddev) {
7469 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7470 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7471 (int)part_stat_read(&disk->part0, sectors[1]) -
7472 atomic_read(&disk->sync_io);
7473 /* sync IO will cause sync_io to increase before the disk_stats
7474 * as sync_io is counted when a request starts, and
7475 * disk_stats is counted when it completes.
7476 * So resync activity will cause curr_events to be smaller than
7477 * when there was no such activity.
7478 * non-sync IO will cause disk_stat to increase without
7479 * increasing sync_io so curr_events will (eventually)
7480 * be larger than it was before. Once it becomes
7481 * substantially larger, the test below will cause
7482 * the array to appear non-idle, and resync will slow
7484 * If there is a lot of outstanding resync activity when
7485 * we set last_event to curr_events, then all that activity
7486 * completing might cause the array to appear non-idle
7487 * and resync will be slowed down even though there might
7488 * not have been non-resync activity. This will only
7489 * happen once though. 'last_events' will soon reflect
7490 * the state where there is little or no outstanding
7491 * resync requests, and further resync activity will
7492 * always make curr_events less than last_events.
7495 if (init || curr_events - rdev->last_events > 64) {
7496 rdev->last_events = curr_events;
7504 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7506 /* another "blocks" (512byte) blocks have been synced */
7507 atomic_sub(blocks, &mddev->recovery_active);
7508 wake_up(&mddev->recovery_wait);
7510 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7511 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7512 md_wakeup_thread(mddev->thread);
7513 // stop recovery, signal do_sync ....
7516 EXPORT_SYMBOL(md_done_sync);
7518 /* md_write_start(mddev, bi)
7519 * If we need to update some array metadata (e.g. 'active' flag
7520 * in superblock) before writing, schedule a superblock update
7521 * and wait for it to complete.
7523 void md_write_start(struct mddev *mddev, struct bio *bi)
7526 if (bio_data_dir(bi) != WRITE)
7529 BUG_ON(mddev->ro == 1);
7530 if (mddev->ro == 2) {
7531 /* need to switch to read/write */
7533 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7534 md_wakeup_thread(mddev->thread);
7535 md_wakeup_thread(mddev->sync_thread);
7538 atomic_inc(&mddev->writes_pending);
7539 if (mddev->safemode == 1)
7540 mddev->safemode = 0;
7541 if (mddev->in_sync) {
7542 spin_lock(&mddev->lock);
7543 if (mddev->in_sync) {
7545 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7546 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7547 md_wakeup_thread(mddev->thread);
7550 spin_unlock(&mddev->lock);
7553 sysfs_notify_dirent_safe(mddev->sysfs_state);
7554 wait_event(mddev->sb_wait,
7555 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7557 EXPORT_SYMBOL(md_write_start);
7559 void md_write_end(struct mddev *mddev)
7561 if (atomic_dec_and_test(&mddev->writes_pending)) {
7562 if (mddev->safemode == 2)
7563 md_wakeup_thread(mddev->thread);
7564 else if (mddev->safemode_delay)
7565 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7568 EXPORT_SYMBOL(md_write_end);
7570 /* md_allow_write(mddev)
7571 * Calling this ensures that the array is marked 'active' so that writes
7572 * may proceed without blocking. It is important to call this before
7573 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7574 * Must be called with mddev_lock held.
7576 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7577 * is dropped, so return -EAGAIN after notifying userspace.
7579 int md_allow_write(struct mddev *mddev)
7585 if (!mddev->pers->sync_request)
7588 spin_lock(&mddev->lock);
7589 if (mddev->in_sync) {
7591 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7592 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7593 if (mddev->safemode_delay &&
7594 mddev->safemode == 0)
7595 mddev->safemode = 1;
7596 spin_unlock(&mddev->lock);
7597 if (mddev_is_clustered(mddev))
7598 md_cluster_ops->metadata_update_start(mddev);
7599 md_update_sb(mddev, 0);
7600 if (mddev_is_clustered(mddev))
7601 md_cluster_ops->metadata_update_finish(mddev);
7602 sysfs_notify_dirent_safe(mddev->sysfs_state);
7604 spin_unlock(&mddev->lock);
7606 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7611 EXPORT_SYMBOL_GPL(md_allow_write);
7613 #define SYNC_MARKS 10
7614 #define SYNC_MARK_STEP (3*HZ)
7615 #define UPDATE_FREQUENCY (5*60*HZ)
7616 void md_do_sync(struct md_thread *thread)
7618 struct mddev *mddev = thread->mddev;
7619 struct mddev *mddev2;
7620 unsigned int currspeed = 0,
7622 sector_t max_sectors,j, io_sectors, recovery_done;
7623 unsigned long mark[SYNC_MARKS];
7624 unsigned long update_time;
7625 sector_t mark_cnt[SYNC_MARKS];
7627 struct list_head *tmp;
7628 sector_t last_check;
7630 struct md_rdev *rdev;
7631 char *desc, *action = NULL;
7632 struct blk_plug plug;
7634 /* just incase thread restarts... */
7635 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7637 if (mddev->ro) {/* never try to sync a read-only array */
7638 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7642 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7643 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7644 desc = "data-check";
7646 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7647 desc = "requested-resync";
7651 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7656 mddev->last_sync_action = action ?: desc;
7658 /* we overload curr_resync somewhat here.
7659 * 0 == not engaged in resync at all
7660 * 2 == checking that there is no conflict with another sync
7661 * 1 == like 2, but have yielded to allow conflicting resync to
7663 * other == active in resync - this many blocks
7665 * Before starting a resync we must have set curr_resync to
7666 * 2, and then checked that every "conflicting" array has curr_resync
7667 * less than ours. When we find one that is the same or higher
7668 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7669 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7670 * This will mean we have to start checking from the beginning again.
7675 mddev->curr_resync = 2;
7678 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7680 for_each_mddev(mddev2, tmp) {
7681 if (mddev2 == mddev)
7683 if (!mddev->parallel_resync
7684 && mddev2->curr_resync
7685 && match_mddev_units(mddev, mddev2)) {
7687 if (mddev < mddev2 && mddev->curr_resync == 2) {
7688 /* arbitrarily yield */
7689 mddev->curr_resync = 1;
7690 wake_up(&resync_wait);
7692 if (mddev > mddev2 && mddev->curr_resync == 1)
7693 /* no need to wait here, we can wait the next
7694 * time 'round when curr_resync == 2
7697 /* We need to wait 'interruptible' so as not to
7698 * contribute to the load average, and not to
7699 * be caught by 'softlockup'
7701 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7702 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7703 mddev2->curr_resync >= mddev->curr_resync) {
7704 printk(KERN_INFO "md: delaying %s of %s"
7705 " until %s has finished (they"
7706 " share one or more physical units)\n",
7707 desc, mdname(mddev), mdname(mddev2));
7709 if (signal_pending(current))
7710 flush_signals(current);
7712 finish_wait(&resync_wait, &wq);
7715 finish_wait(&resync_wait, &wq);
7718 } while (mddev->curr_resync < 2);
7721 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7722 /* resync follows the size requested by the personality,
7723 * which defaults to physical size, but can be virtual size
7725 max_sectors = mddev->resync_max_sectors;
7726 atomic64_set(&mddev->resync_mismatches, 0);
7727 /* we don't use the checkpoint if there's a bitmap */
7728 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7729 j = mddev->resync_min;
7730 else if (!mddev->bitmap)
7731 j = mddev->recovery_cp;
7733 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7734 max_sectors = mddev->resync_max_sectors;
7736 /* recovery follows the physical size of devices */
7737 max_sectors = mddev->dev_sectors;
7740 rdev_for_each_rcu(rdev, mddev)
7741 if (rdev->raid_disk >= 0 &&
7742 !test_bit(Faulty, &rdev->flags) &&
7743 !test_bit(In_sync, &rdev->flags) &&
7744 rdev->recovery_offset < j)
7745 j = rdev->recovery_offset;
7748 /* If there is a bitmap, we need to make sure all
7749 * writes that started before we added a spare
7750 * complete before we start doing a recovery.
7751 * Otherwise the write might complete and (via
7752 * bitmap_endwrite) set a bit in the bitmap after the
7753 * recovery has checked that bit and skipped that
7756 if (mddev->bitmap) {
7757 mddev->pers->quiesce(mddev, 1);
7758 mddev->pers->quiesce(mddev, 0);
7762 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7763 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7764 " %d KB/sec/disk.\n", speed_min(mddev));
7765 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7766 "(but not more than %d KB/sec) for %s.\n",
7767 speed_max(mddev), desc);
7769 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7772 for (m = 0; m < SYNC_MARKS; m++) {
7774 mark_cnt[m] = io_sectors;
7777 mddev->resync_mark = mark[last_mark];
7778 mddev->resync_mark_cnt = mark_cnt[last_mark];
7781 * Tune reconstruction:
7783 window = 32*(PAGE_SIZE/512);
7784 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7785 window/2, (unsigned long long)max_sectors/2);
7787 atomic_set(&mddev->recovery_active, 0);
7792 "md: resuming %s of %s from checkpoint.\n",
7793 desc, mdname(mddev));
7794 mddev->curr_resync = j;
7796 mddev->curr_resync = 3; /* no longer delayed */
7797 mddev->curr_resync_completed = j;
7798 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7799 md_new_event(mddev);
7800 update_time = jiffies;
7802 if (mddev_is_clustered(mddev))
7803 md_cluster_ops->resync_start(mddev, j, max_sectors);
7805 blk_start_plug(&plug);
7806 while (j < max_sectors) {
7811 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7812 ((mddev->curr_resync > mddev->curr_resync_completed &&
7813 (mddev->curr_resync - mddev->curr_resync_completed)
7814 > (max_sectors >> 4)) ||
7815 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7816 (j - mddev->curr_resync_completed)*2
7817 >= mddev->resync_max - mddev->curr_resync_completed ||
7818 mddev->curr_resync_completed > mddev->resync_max
7820 /* time to update curr_resync_completed */
7821 wait_event(mddev->recovery_wait,
7822 atomic_read(&mddev->recovery_active) == 0);
7823 mddev->curr_resync_completed = j;
7824 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7825 j > mddev->recovery_cp)
7826 mddev->recovery_cp = j;
7827 update_time = jiffies;
7828 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7829 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7832 while (j >= mddev->resync_max &&
7833 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7834 /* As this condition is controlled by user-space,
7835 * we can block indefinitely, so use '_interruptible'
7836 * to avoid triggering warnings.
7838 flush_signals(current); /* just in case */
7839 wait_event_interruptible(mddev->recovery_wait,
7840 mddev->resync_max > j
7841 || test_bit(MD_RECOVERY_INTR,
7845 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7848 sectors = mddev->pers->sync_request(mddev, j, &skipped);
7850 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7854 if (!skipped) { /* actual IO requested */
7855 io_sectors += sectors;
7856 atomic_add(sectors, &mddev->recovery_active);
7859 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7863 if (j > max_sectors)
7864 /* when skipping, extra large numbers can be returned. */
7867 mddev->curr_resync = j;
7868 if (mddev_is_clustered(mddev))
7869 md_cluster_ops->resync_info_update(mddev, j, max_sectors);
7870 mddev->curr_mark_cnt = io_sectors;
7871 if (last_check == 0)
7872 /* this is the earliest that rebuild will be
7873 * visible in /proc/mdstat
7875 md_new_event(mddev);
7877 if (last_check + window > io_sectors || j == max_sectors)
7880 last_check = io_sectors;
7882 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7884 int next = (last_mark+1) % SYNC_MARKS;
7886 mddev->resync_mark = mark[next];
7887 mddev->resync_mark_cnt = mark_cnt[next];
7888 mark[next] = jiffies;
7889 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7893 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7897 * this loop exits only if either when we are slower than
7898 * the 'hard' speed limit, or the system was IO-idle for
7900 * the system might be non-idle CPU-wise, but we only care
7901 * about not overloading the IO subsystem. (things like an
7902 * e2fsck being done on the RAID array should execute fast)
7906 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7907 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7908 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7910 if (currspeed > speed_min(mddev)) {
7911 if (currspeed > speed_max(mddev)) {
7915 if (!is_mddev_idle(mddev, 0)) {
7917 * Give other IO more of a chance.
7918 * The faster the devices, the less we wait.
7920 wait_event(mddev->recovery_wait,
7921 !atomic_read(&mddev->recovery_active));
7925 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7926 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7927 ? "interrupted" : "done");
7929 * this also signals 'finished resyncing' to md_stop
7931 blk_finish_plug(&plug);
7932 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7934 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7935 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7936 mddev->curr_resync > 2) {
7937 mddev->curr_resync_completed = mddev->curr_resync;
7938 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7940 /* tell personality that we are finished */
7941 mddev->pers->sync_request(mddev, max_sectors, &skipped);
7943 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7944 mddev->curr_resync > 2) {
7945 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7946 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7947 if (mddev->curr_resync >= mddev->recovery_cp) {
7949 "md: checkpointing %s of %s.\n",
7950 desc, mdname(mddev));
7951 if (test_bit(MD_RECOVERY_ERROR,
7953 mddev->recovery_cp =
7954 mddev->curr_resync_completed;
7956 mddev->recovery_cp =
7960 mddev->recovery_cp = MaxSector;
7962 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7963 mddev->curr_resync = MaxSector;
7965 rdev_for_each_rcu(rdev, mddev)
7966 if (rdev->raid_disk >= 0 &&
7967 mddev->delta_disks >= 0 &&
7968 !test_bit(Faulty, &rdev->flags) &&
7969 !test_bit(In_sync, &rdev->flags) &&
7970 rdev->recovery_offset < mddev->curr_resync)
7971 rdev->recovery_offset = mddev->curr_resync;
7976 if (mddev_is_clustered(mddev))
7977 md_cluster_ops->resync_finish(mddev);
7979 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7981 spin_lock(&mddev->lock);
7982 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7983 /* We completed so min/max setting can be forgotten if used. */
7984 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7985 mddev->resync_min = 0;
7986 mddev->resync_max = MaxSector;
7987 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7988 mddev->resync_min = mddev->curr_resync_completed;
7989 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7990 mddev->curr_resync = 0;
7991 spin_unlock(&mddev->lock);
7993 wake_up(&resync_wait);
7994 md_wakeup_thread(mddev->thread);
7997 EXPORT_SYMBOL_GPL(md_do_sync);
7999 static int remove_and_add_spares(struct mddev *mddev,
8000 struct md_rdev *this)
8002 struct md_rdev *rdev;
8006 rdev_for_each(rdev, mddev)
8007 if ((this == NULL || rdev == this) &&
8008 rdev->raid_disk >= 0 &&
8009 !test_bit(Blocked, &rdev->flags) &&
8010 (test_bit(Faulty, &rdev->flags) ||
8011 ! test_bit(In_sync, &rdev->flags)) &&
8012 atomic_read(&rdev->nr_pending)==0) {
8013 if (mddev->pers->hot_remove_disk(
8014 mddev, rdev) == 0) {
8015 sysfs_unlink_rdev(mddev, rdev);
8016 rdev->raid_disk = -1;
8020 if (removed && mddev->kobj.sd)
8021 sysfs_notify(&mddev->kobj, NULL, "degraded");
8026 rdev_for_each(rdev, mddev) {
8027 if (rdev->raid_disk >= 0 &&
8028 !test_bit(In_sync, &rdev->flags) &&
8029 !test_bit(Faulty, &rdev->flags))
8031 if (rdev->raid_disk >= 0)
8033 if (test_bit(Faulty, &rdev->flags))
8036 ! (rdev->saved_raid_disk >= 0 &&
8037 !test_bit(Bitmap_sync, &rdev->flags)))
8040 rdev->recovery_offset = 0;
8042 hot_add_disk(mddev, rdev) == 0) {
8043 if (sysfs_link_rdev(mddev, rdev))
8044 /* failure here is OK */;
8046 md_new_event(mddev);
8047 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8052 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8056 static void md_start_sync(struct work_struct *ws)
8058 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8060 mddev->sync_thread = md_register_thread(md_do_sync,
8063 if (!mddev->sync_thread) {
8064 printk(KERN_ERR "%s: could not start resync"
8067 /* leave the spares where they are, it shouldn't hurt */
8068 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8069 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8070 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8071 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8072 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8073 wake_up(&resync_wait);
8074 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8076 if (mddev->sysfs_action)
8077 sysfs_notify_dirent_safe(mddev->sysfs_action);
8079 md_wakeup_thread(mddev->sync_thread);
8080 sysfs_notify_dirent_safe(mddev->sysfs_action);
8081 md_new_event(mddev);
8085 * This routine is regularly called by all per-raid-array threads to
8086 * deal with generic issues like resync and super-block update.
8087 * Raid personalities that don't have a thread (linear/raid0) do not
8088 * need this as they never do any recovery or update the superblock.
8090 * It does not do any resync itself, but rather "forks" off other threads
8091 * to do that as needed.
8092 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8093 * "->recovery" and create a thread at ->sync_thread.
8094 * When the thread finishes it sets MD_RECOVERY_DONE
8095 * and wakeups up this thread which will reap the thread and finish up.
8096 * This thread also removes any faulty devices (with nr_pending == 0).
8098 * The overall approach is:
8099 * 1/ if the superblock needs updating, update it.
8100 * 2/ If a recovery thread is running, don't do anything else.
8101 * 3/ If recovery has finished, clean up, possibly marking spares active.
8102 * 4/ If there are any faulty devices, remove them.
8103 * 5/ If array is degraded, try to add spares devices
8104 * 6/ If array has spares or is not in-sync, start a resync thread.
8106 void md_check_recovery(struct mddev *mddev)
8108 if (mddev->suspended)
8112 bitmap_daemon_work(mddev);
8114 if (signal_pending(current)) {
8115 if (mddev->pers->sync_request && !mddev->external) {
8116 printk(KERN_INFO "md: %s in immediate safe mode\n",
8118 mddev->safemode = 2;
8120 flush_signals(current);
8123 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8126 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8127 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8128 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8129 (mddev->external == 0 && mddev->safemode == 1) ||
8130 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8131 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8135 if (mddev_trylock(mddev)) {
8139 struct md_rdev *rdev;
8140 if (!mddev->external && mddev->in_sync)
8141 /* 'Blocked' flag not needed as failed devices
8142 * will be recorded if array switched to read/write.
8143 * Leaving it set will prevent the device
8144 * from being removed.
8146 rdev_for_each(rdev, mddev)
8147 clear_bit(Blocked, &rdev->flags);
8148 /* On a read-only array we can:
8149 * - remove failed devices
8150 * - add already-in_sync devices if the array itself
8152 * As we only add devices that are already in-sync,
8153 * we can activate the spares immediately.
8155 remove_and_add_spares(mddev, NULL);
8156 /* There is no thread, but we need to call
8157 * ->spare_active and clear saved_raid_disk
8159 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8160 md_reap_sync_thread(mddev);
8161 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8162 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8163 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8167 if (!mddev->external) {
8169 spin_lock(&mddev->lock);
8170 if (mddev->safemode &&
8171 !atomic_read(&mddev->writes_pending) &&
8173 mddev->recovery_cp == MaxSector) {
8176 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8178 if (mddev->safemode == 1)
8179 mddev->safemode = 0;
8180 spin_unlock(&mddev->lock);
8182 sysfs_notify_dirent_safe(mddev->sysfs_state);
8185 if (mddev->flags & MD_UPDATE_SB_FLAGS) {
8186 if (mddev_is_clustered(mddev))
8187 md_cluster_ops->metadata_update_start(mddev);
8188 md_update_sb(mddev, 0);
8189 if (mddev_is_clustered(mddev))
8190 md_cluster_ops->metadata_update_finish(mddev);
8193 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8194 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8195 /* resync/recovery still happening */
8196 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8199 if (mddev->sync_thread) {
8200 md_reap_sync_thread(mddev);
8203 /* Set RUNNING before clearing NEEDED to avoid
8204 * any transients in the value of "sync_action".
8206 mddev->curr_resync_completed = 0;
8207 spin_lock(&mddev->lock);
8208 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8209 spin_unlock(&mddev->lock);
8210 /* Clear some bits that don't mean anything, but
8213 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8214 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8216 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8217 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8219 /* no recovery is running.
8220 * remove any failed drives, then
8221 * add spares if possible.
8222 * Spares are also removed and re-added, to allow
8223 * the personality to fail the re-add.
8226 if (mddev->reshape_position != MaxSector) {
8227 if (mddev->pers->check_reshape == NULL ||
8228 mddev->pers->check_reshape(mddev) != 0)
8229 /* Cannot proceed */
8231 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8232 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8233 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8234 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8235 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8236 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8237 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8238 } else if (mddev->recovery_cp < MaxSector) {
8239 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8240 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8241 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8242 /* nothing to be done ... */
8245 if (mddev->pers->sync_request) {
8247 /* We are adding a device or devices to an array
8248 * which has the bitmap stored on all devices.
8249 * So make sure all bitmap pages get written
8251 bitmap_write_all(mddev->bitmap);
8253 INIT_WORK(&mddev->del_work, md_start_sync);
8254 queue_work(md_misc_wq, &mddev->del_work);
8258 if (!mddev->sync_thread) {
8259 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8260 wake_up(&resync_wait);
8261 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8263 if (mddev->sysfs_action)
8264 sysfs_notify_dirent_safe(mddev->sysfs_action);
8267 wake_up(&mddev->sb_wait);
8268 mddev_unlock(mddev);
8271 EXPORT_SYMBOL(md_check_recovery);
8273 void md_reap_sync_thread(struct mddev *mddev)
8275 struct md_rdev *rdev;
8277 /* resync has finished, collect result */
8278 md_unregister_thread(&mddev->sync_thread);
8279 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8280 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8282 /* activate any spares */
8283 if (mddev->pers->spare_active(mddev)) {
8284 sysfs_notify(&mddev->kobj, NULL,
8286 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8289 if (mddev_is_clustered(mddev))
8290 md_cluster_ops->metadata_update_start(mddev);
8291 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8292 mddev->pers->finish_reshape)
8293 mddev->pers->finish_reshape(mddev);
8295 /* If array is no-longer degraded, then any saved_raid_disk
8296 * information must be scrapped.
8298 if (!mddev->degraded)
8299 rdev_for_each(rdev, mddev)
8300 rdev->saved_raid_disk = -1;
8302 md_update_sb(mddev, 1);
8303 if (mddev_is_clustered(mddev))
8304 md_cluster_ops->metadata_update_finish(mddev);
8305 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8306 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8307 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8308 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8309 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8310 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8311 wake_up(&resync_wait);
8312 /* flag recovery needed just to double check */
8313 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8314 sysfs_notify_dirent_safe(mddev->sysfs_action);
8315 md_new_event(mddev);
8316 if (mddev->event_work.func)
8317 queue_work(md_misc_wq, &mddev->event_work);
8319 EXPORT_SYMBOL(md_reap_sync_thread);
8321 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8323 sysfs_notify_dirent_safe(rdev->sysfs_state);
8324 wait_event_timeout(rdev->blocked_wait,
8325 !test_bit(Blocked, &rdev->flags) &&
8326 !test_bit(BlockedBadBlocks, &rdev->flags),
8327 msecs_to_jiffies(5000));
8328 rdev_dec_pending(rdev, mddev);
8330 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8332 void md_finish_reshape(struct mddev *mddev)
8334 /* called be personality module when reshape completes. */
8335 struct md_rdev *rdev;
8337 rdev_for_each(rdev, mddev) {
8338 if (rdev->data_offset > rdev->new_data_offset)
8339 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8341 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8342 rdev->data_offset = rdev->new_data_offset;
8345 EXPORT_SYMBOL(md_finish_reshape);
8347 /* Bad block management.
8348 * We can record which blocks on each device are 'bad' and so just
8349 * fail those blocks, or that stripe, rather than the whole device.
8350 * Entries in the bad-block table are 64bits wide. This comprises:
8351 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8352 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8353 * A 'shift' can be set so that larger blocks are tracked and
8354 * consequently larger devices can be covered.
8355 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8357 * Locking of the bad-block table uses a seqlock so md_is_badblock
8358 * might need to retry if it is very unlucky.
8359 * We will sometimes want to check for bad blocks in a bi_end_io function,
8360 * so we use the write_seqlock_irq variant.
8362 * When looking for a bad block we specify a range and want to
8363 * know if any block in the range is bad. So we binary-search
8364 * to the last range that starts at-or-before the given endpoint,
8365 * (or "before the sector after the target range")
8366 * then see if it ends after the given start.
8368 * 0 if there are no known bad blocks in the range
8369 * 1 if there are known bad block which are all acknowledged
8370 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8371 * plus the start/length of the first bad section we overlap.
8373 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8374 sector_t *first_bad, int *bad_sectors)
8380 sector_t target = s + sectors;
8383 if (bb->shift > 0) {
8384 /* round the start down, and the end up */
8386 target += (1<<bb->shift) - 1;
8387 target >>= bb->shift;
8388 sectors = target - s;
8390 /* 'target' is now the first block after the bad range */
8393 seq = read_seqbegin(&bb->lock);
8398 /* Binary search between lo and hi for 'target'
8399 * i.e. for the last range that starts before 'target'
8401 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8402 * are known not to be the last range before target.
8403 * VARIANT: hi-lo is the number of possible
8404 * ranges, and decreases until it reaches 1
8406 while (hi - lo > 1) {
8407 int mid = (lo + hi) / 2;
8408 sector_t a = BB_OFFSET(p[mid]);
8410 /* This could still be the one, earlier ranges
8414 /* This and later ranges are definitely out. */
8417 /* 'lo' might be the last that started before target, but 'hi' isn't */
8419 /* need to check all range that end after 's' to see if
8420 * any are unacknowledged.
8423 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8424 if (BB_OFFSET(p[lo]) < target) {
8425 /* starts before the end, and finishes after
8426 * the start, so they must overlap
8428 if (rv != -1 && BB_ACK(p[lo]))
8432 *first_bad = BB_OFFSET(p[lo]);
8433 *bad_sectors = BB_LEN(p[lo]);
8439 if (read_seqretry(&bb->lock, seq))
8444 EXPORT_SYMBOL_GPL(md_is_badblock);
8447 * Add a range of bad blocks to the table.
8448 * This might extend the table, or might contract it
8449 * if two adjacent ranges can be merged.
8450 * We binary-search to find the 'insertion' point, then
8451 * decide how best to handle it.
8453 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8459 unsigned long flags;
8462 /* badblocks are disabled */
8466 /* round the start down, and the end up */
8467 sector_t next = s + sectors;
8469 next += (1<<bb->shift) - 1;
8474 write_seqlock_irqsave(&bb->lock, flags);
8479 /* Find the last range that starts at-or-before 's' */
8480 while (hi - lo > 1) {
8481 int mid = (lo + hi) / 2;
8482 sector_t a = BB_OFFSET(p[mid]);
8488 if (hi > lo && BB_OFFSET(p[lo]) > s)
8492 /* we found a range that might merge with the start
8495 sector_t a = BB_OFFSET(p[lo]);
8496 sector_t e = a + BB_LEN(p[lo]);
8497 int ack = BB_ACK(p[lo]);
8499 /* Yes, we can merge with a previous range */
8500 if (s == a && s + sectors >= e)
8501 /* new range covers old */
8504 ack = ack && acknowledged;
8506 if (e < s + sectors)
8508 if (e - a <= BB_MAX_LEN) {
8509 p[lo] = BB_MAKE(a, e-a, ack);
8512 /* does not all fit in one range,
8513 * make p[lo] maximal
8515 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8516 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8522 if (sectors && hi < bb->count) {
8523 /* 'hi' points to the first range that starts after 's'.
8524 * Maybe we can merge with the start of that range */
8525 sector_t a = BB_OFFSET(p[hi]);
8526 sector_t e = a + BB_LEN(p[hi]);
8527 int ack = BB_ACK(p[hi]);
8528 if (a <= s + sectors) {
8529 /* merging is possible */
8530 if (e <= s + sectors) {
8535 ack = ack && acknowledged;
8538 if (e - a <= BB_MAX_LEN) {
8539 p[hi] = BB_MAKE(a, e-a, ack);
8542 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8550 if (sectors == 0 && hi < bb->count) {
8551 /* we might be able to combine lo and hi */
8552 /* Note: 's' is at the end of 'lo' */
8553 sector_t a = BB_OFFSET(p[hi]);
8554 int lolen = BB_LEN(p[lo]);
8555 int hilen = BB_LEN(p[hi]);
8556 int newlen = lolen + hilen - (s - a);
8557 if (s >= a && newlen < BB_MAX_LEN) {
8558 /* yes, we can combine them */
8559 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8560 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8561 memmove(p + hi, p + hi + 1,
8562 (bb->count - hi - 1) * 8);
8567 /* didn't merge (it all).
8568 * Need to add a range just before 'hi' */
8569 if (bb->count >= MD_MAX_BADBLOCKS) {
8570 /* No room for more */
8574 int this_sectors = sectors;
8575 memmove(p + hi + 1, p + hi,
8576 (bb->count - hi) * 8);
8579 if (this_sectors > BB_MAX_LEN)
8580 this_sectors = BB_MAX_LEN;
8581 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8582 sectors -= this_sectors;
8589 bb->unacked_exist = 1;
8590 write_sequnlock_irqrestore(&bb->lock, flags);
8595 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8600 s += rdev->new_data_offset;
8602 s += rdev->data_offset;
8603 rv = md_set_badblocks(&rdev->badblocks,
8606 /* Make sure they get written out promptly */
8607 sysfs_notify_dirent_safe(rdev->sysfs_state);
8608 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8609 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
8610 md_wakeup_thread(rdev->mddev->thread);
8614 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8617 * Remove a range of bad blocks from the table.
8618 * This may involve extending the table if we spilt a region,
8619 * but it must not fail. So if the table becomes full, we just
8620 * drop the remove request.
8622 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8626 sector_t target = s + sectors;
8629 if (bb->shift > 0) {
8630 /* When clearing we round the start up and the end down.
8631 * This should not matter as the shift should align with
8632 * the block size and no rounding should ever be needed.
8633 * However it is better the think a block is bad when it
8634 * isn't than to think a block is not bad when it is.
8636 s += (1<<bb->shift) - 1;
8638 target >>= bb->shift;
8639 sectors = target - s;
8642 write_seqlock_irq(&bb->lock);
8647 /* Find the last range that starts before 'target' */
8648 while (hi - lo > 1) {
8649 int mid = (lo + hi) / 2;
8650 sector_t a = BB_OFFSET(p[mid]);
8657 /* p[lo] is the last range that could overlap the
8658 * current range. Earlier ranges could also overlap,
8659 * but only this one can overlap the end of the range.
8661 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8662 /* Partial overlap, leave the tail of this range */
8663 int ack = BB_ACK(p[lo]);
8664 sector_t a = BB_OFFSET(p[lo]);
8665 sector_t end = a + BB_LEN(p[lo]);
8668 /* we need to split this range */
8669 if (bb->count >= MD_MAX_BADBLOCKS) {
8673 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8675 p[lo] = BB_MAKE(a, s-a, ack);
8678 p[lo] = BB_MAKE(target, end - target, ack);
8679 /* there is no longer an overlap */
8684 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8685 /* This range does overlap */
8686 if (BB_OFFSET(p[lo]) < s) {
8687 /* Keep the early parts of this range. */
8688 int ack = BB_ACK(p[lo]);
8689 sector_t start = BB_OFFSET(p[lo]);
8690 p[lo] = BB_MAKE(start, s - start, ack);
8691 /* now low doesn't overlap, so.. */
8696 /* 'lo' is strictly before, 'hi' is strictly after,
8697 * anything between needs to be discarded
8700 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8701 bb->count -= (hi - lo - 1);
8707 write_sequnlock_irq(&bb->lock);
8711 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8715 s += rdev->new_data_offset;
8717 s += rdev->data_offset;
8718 return md_clear_badblocks(&rdev->badblocks,
8721 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8724 * Acknowledge all bad blocks in a list.
8725 * This only succeeds if ->changed is clear. It is used by
8726 * in-kernel metadata updates
8728 void md_ack_all_badblocks(struct badblocks *bb)
8730 if (bb->page == NULL || bb->changed)
8731 /* no point even trying */
8733 write_seqlock_irq(&bb->lock);
8735 if (bb->changed == 0 && bb->unacked_exist) {
8738 for (i = 0; i < bb->count ; i++) {
8739 if (!BB_ACK(p[i])) {
8740 sector_t start = BB_OFFSET(p[i]);
8741 int len = BB_LEN(p[i]);
8742 p[i] = BB_MAKE(start, len, 1);
8745 bb->unacked_exist = 0;
8747 write_sequnlock_irq(&bb->lock);
8749 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8751 /* sysfs access to bad-blocks list.
8752 * We present two files.
8753 * 'bad-blocks' lists sector numbers and lengths of ranges that
8754 * are recorded as bad. The list is truncated to fit within
8755 * the one-page limit of sysfs.
8756 * Writing "sector length" to this file adds an acknowledged
8758 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8759 * been acknowledged. Writing to this file adds bad blocks
8760 * without acknowledging them. This is largely for testing.
8764 badblocks_show(struct badblocks *bb, char *page, int unack)
8775 seq = read_seqbegin(&bb->lock);
8780 while (len < PAGE_SIZE && i < bb->count) {
8781 sector_t s = BB_OFFSET(p[i]);
8782 unsigned int length = BB_LEN(p[i]);
8783 int ack = BB_ACK(p[i]);
8789 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8790 (unsigned long long)s << bb->shift,
8791 length << bb->shift);
8793 if (unack && len == 0)
8794 bb->unacked_exist = 0;
8796 if (read_seqretry(&bb->lock, seq))
8805 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8807 unsigned long long sector;
8811 /* Allow clearing via sysfs *only* for testing/debugging.
8812 * Normally only a successful write may clear a badblock
8815 if (page[0] == '-') {
8819 #endif /* DO_DEBUG */
8821 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8823 if (newline != '\n')
8835 md_clear_badblocks(bb, sector, length);
8838 #endif /* DO_DEBUG */
8839 if (md_set_badblocks(bb, sector, length, !unack))
8845 static int md_notify_reboot(struct notifier_block *this,
8846 unsigned long code, void *x)
8848 struct list_head *tmp;
8849 struct mddev *mddev;
8852 for_each_mddev(mddev, tmp) {
8853 if (mddev_trylock(mddev)) {
8855 __md_stop_writes(mddev);
8856 if (mddev->persistent)
8857 mddev->safemode = 2;
8858 mddev_unlock(mddev);
8863 * certain more exotic SCSI devices are known to be
8864 * volatile wrt too early system reboots. While the
8865 * right place to handle this issue is the given
8866 * driver, we do want to have a safe RAID driver ...
8874 static struct notifier_block md_notifier = {
8875 .notifier_call = md_notify_reboot,
8877 .priority = INT_MAX, /* before any real devices */
8880 static void md_geninit(void)
8882 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8884 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8887 static int __init md_init(void)
8891 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8895 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8899 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8902 if ((ret = register_blkdev(0, "mdp")) < 0)
8906 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8907 md_probe, NULL, NULL);
8908 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8909 md_probe, NULL, NULL);
8911 register_reboot_notifier(&md_notifier);
8912 raid_table_header = register_sysctl_table(raid_root_table);
8918 unregister_blkdev(MD_MAJOR, "md");
8920 destroy_workqueue(md_misc_wq);
8922 destroy_workqueue(md_wq);
8927 void md_reload_sb(struct mddev *mddev)
8929 struct md_rdev *rdev, *tmp;
8931 rdev_for_each_safe(rdev, tmp, mddev) {
8932 rdev->sb_loaded = 0;
8933 ClearPageUptodate(rdev->sb_page);
8935 mddev->raid_disks = 0;
8937 rdev_for_each_safe(rdev, tmp, mddev) {
8938 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8939 /* since we don't write to faulty devices, we figure out if the
8940 * disk is faulty by comparing events
8942 if (mddev->events > sb->events)
8943 set_bit(Faulty, &rdev->flags);
8947 EXPORT_SYMBOL(md_reload_sb);
8952 * Searches all registered partitions for autorun RAID arrays
8956 static LIST_HEAD(all_detected_devices);
8957 struct detected_devices_node {
8958 struct list_head list;
8962 void md_autodetect_dev(dev_t dev)
8964 struct detected_devices_node *node_detected_dev;
8966 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8967 if (node_detected_dev) {
8968 node_detected_dev->dev = dev;
8969 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8971 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8972 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8976 static void autostart_arrays(int part)
8978 struct md_rdev *rdev;
8979 struct detected_devices_node *node_detected_dev;
8981 int i_scanned, i_passed;
8986 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8988 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8990 node_detected_dev = list_entry(all_detected_devices.next,
8991 struct detected_devices_node, list);
8992 list_del(&node_detected_dev->list);
8993 dev = node_detected_dev->dev;
8994 kfree(node_detected_dev);
8995 rdev = md_import_device(dev,0, 90);
8999 if (test_bit(Faulty, &rdev->flags))
9002 set_bit(AutoDetected, &rdev->flags);
9003 list_add(&rdev->same_set, &pending_raid_disks);
9007 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
9008 i_scanned, i_passed);
9010 autorun_devices(part);
9013 #endif /* !MODULE */
9015 static __exit void md_exit(void)
9017 struct mddev *mddev;
9018 struct list_head *tmp;
9021 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9022 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9024 unregister_blkdev(MD_MAJOR,"md");
9025 unregister_blkdev(mdp_major, "mdp");
9026 unregister_reboot_notifier(&md_notifier);
9027 unregister_sysctl_table(raid_table_header);
9029 /* We cannot unload the modules while some process is
9030 * waiting for us in select() or poll() - wake them up
9033 while (waitqueue_active(&md_event_waiters)) {
9034 /* not safe to leave yet */
9035 wake_up(&md_event_waiters);
9039 remove_proc_entry("mdstat", NULL);
9041 for_each_mddev(mddev, tmp) {
9042 export_array(mddev);
9043 mddev->hold_active = 0;
9045 destroy_workqueue(md_misc_wq);
9046 destroy_workqueue(md_wq);
9049 subsys_initcall(md_init);
9050 module_exit(md_exit)
9052 static int get_ro(char *buffer, struct kernel_param *kp)
9054 return sprintf(buffer, "%d", start_readonly);
9056 static int set_ro(const char *val, struct kernel_param *kp)
9058 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9061 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9062 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9063 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9065 MODULE_LICENSE("GPL");
9066 MODULE_DESCRIPTION("MD RAID framework");
9068 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);