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.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/kthread.h>
48 #include <linux/blkdev.h>
49 #include <linux/badblocks.h>
50 #include <linux/sysctl.h>
51 #include <linux/seq_file.h>
53 #include <linux/poll.h>
54 #include <linux/ctype.h>
55 #include <linux/string.h>
56 #include <linux/hdreg.h>
57 #include <linux/proc_fs.h>
58 #include <linux/random.h>
59 #include <linux/module.h>
60 #include <linux/reboot.h>
61 #include <linux/file.h>
62 #include <linux/compat.h>
63 #include <linux/delay.h>
64 #include <linux/raid/md_p.h>
65 #include <linux/raid/md_u.h>
66 #include <linux/slab.h>
67 #include <trace/events/block.h>
70 #include "md-cluster.h"
73 static void autostart_arrays(int part);
76 /* pers_list is a list of registered personalities protected
78 * pers_lock does extra service to protect accesses to
79 * mddev->thread when the mutex cannot be held.
81 static LIST_HEAD(pers_list);
82 static DEFINE_SPINLOCK(pers_lock);
84 struct md_cluster_operations *md_cluster_ops;
85 EXPORT_SYMBOL(md_cluster_ops);
86 struct module *md_cluster_mod;
87 EXPORT_SYMBOL(md_cluster_mod);
89 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
90 static struct workqueue_struct *md_wq;
91 static struct workqueue_struct *md_misc_wq;
93 static int remove_and_add_spares(struct mddev *mddev,
94 struct md_rdev *this);
95 static void mddev_detach(struct mddev *mddev);
98 * Default number of read corrections we'll attempt on an rdev
99 * before ejecting it from the array. We divide the read error
100 * count by 2 for every hour elapsed between read errors.
102 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
104 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
105 * is 1000 KB/sec, so the extra system load does not show up that much.
106 * Increase it if you want to have more _guaranteed_ speed. Note that
107 * the RAID driver will use the maximum available bandwidth if the IO
108 * subsystem is idle. There is also an 'absolute maximum' reconstruction
109 * speed limit - in case reconstruction slows down your system despite
112 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
113 * or /sys/block/mdX/md/sync_speed_{min,max}
116 static int sysctl_speed_limit_min = 1000;
117 static int sysctl_speed_limit_max = 200000;
118 static inline int speed_min(struct mddev *mddev)
120 return mddev->sync_speed_min ?
121 mddev->sync_speed_min : sysctl_speed_limit_min;
124 static inline int speed_max(struct mddev *mddev)
126 return mddev->sync_speed_max ?
127 mddev->sync_speed_max : sysctl_speed_limit_max;
130 static struct ctl_table_header *raid_table_header;
132 static struct ctl_table raid_table[] = {
134 .procname = "speed_limit_min",
135 .data = &sysctl_speed_limit_min,
136 .maxlen = sizeof(int),
137 .mode = S_IRUGO|S_IWUSR,
138 .proc_handler = proc_dointvec,
141 .procname = "speed_limit_max",
142 .data = &sysctl_speed_limit_max,
143 .maxlen = sizeof(int),
144 .mode = S_IRUGO|S_IWUSR,
145 .proc_handler = proc_dointvec,
150 static struct ctl_table raid_dir_table[] = {
154 .mode = S_IRUGO|S_IXUGO,
160 static struct ctl_table raid_root_table[] = {
165 .child = raid_dir_table,
170 static const struct block_device_operations md_fops;
172 static int start_readonly;
175 * like bio_clone, but with a local bio set
178 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
183 if (!mddev || !mddev->bio_set)
184 return bio_alloc(gfp_mask, nr_iovecs);
186 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
191 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
194 * We have a system wide 'event count' that is incremented
195 * on any 'interesting' event, and readers of /proc/mdstat
196 * can use 'poll' or 'select' to find out when the event
200 * start array, stop array, error, add device, remove device,
201 * start build, activate spare
203 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
204 static atomic_t md_event_count;
205 void md_new_event(struct mddev *mddev)
207 atomic_inc(&md_event_count);
208 wake_up(&md_event_waiters);
210 EXPORT_SYMBOL_GPL(md_new_event);
213 * Enables to iterate over all existing md arrays
214 * all_mddevs_lock protects this list.
216 static LIST_HEAD(all_mddevs);
217 static DEFINE_SPINLOCK(all_mddevs_lock);
220 * iterates through all used mddevs in the system.
221 * We take care to grab the all_mddevs_lock whenever navigating
222 * the list, and to always hold a refcount when unlocked.
223 * Any code which breaks out of this loop while own
224 * a reference to the current mddev and must mddev_put it.
226 #define for_each_mddev(_mddev,_tmp) \
228 for (({ spin_lock(&all_mddevs_lock); \
229 _tmp = all_mddevs.next; \
231 ({ if (_tmp != &all_mddevs) \
232 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
233 spin_unlock(&all_mddevs_lock); \
234 if (_mddev) mddev_put(_mddev); \
235 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
236 _tmp != &all_mddevs;}); \
237 ({ spin_lock(&all_mddevs_lock); \
238 _tmp = _tmp->next;}) \
241 /* Rather than calling directly into the personality make_request function,
242 * IO requests come here first so that we can check if the device is
243 * being suspended pending a reconfiguration.
244 * We hold a refcount over the call to ->make_request. By the time that
245 * call has finished, the bio has been linked into some internal structure
246 * and so is visible to ->quiesce(), so we don't need the refcount any more.
248 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
250 const int rw = bio_data_dir(bio);
251 struct mddev *mddev = q->queuedata;
252 unsigned int sectors;
255 blk_queue_split(q, &bio, q->bio_split);
257 if (mddev == NULL || mddev->pers == NULL) {
259 return BLK_QC_T_NONE;
261 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
262 if (bio_sectors(bio) != 0)
263 bio->bi_error = -EROFS;
265 return BLK_QC_T_NONE;
267 smp_rmb(); /* Ensure implications of 'active' are visible */
269 if (mddev->suspended) {
272 prepare_to_wait(&mddev->sb_wait, &__wait,
273 TASK_UNINTERRUPTIBLE);
274 if (!mddev->suspended)
280 finish_wait(&mddev->sb_wait, &__wait);
282 atomic_inc(&mddev->active_io);
286 * save the sectors now since our bio can
287 * go away inside make_request
289 sectors = bio_sectors(bio);
290 /* bio could be mergeable after passing to underlayer */
291 bio->bi_opf &= ~REQ_NOMERGE;
292 mddev->pers->make_request(mddev, bio);
294 cpu = part_stat_lock();
295 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
296 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
299 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
300 wake_up(&mddev->sb_wait);
302 return BLK_QC_T_NONE;
305 /* mddev_suspend makes sure no new requests are submitted
306 * to the device, and that any requests that have been submitted
307 * are completely handled.
308 * Once mddev_detach() is called and completes, the module will be
311 void mddev_suspend(struct mddev *mddev)
313 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
314 if (mddev->suspended++)
317 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
318 mddev->pers->quiesce(mddev, 1);
320 del_timer_sync(&mddev->safemode_timer);
322 EXPORT_SYMBOL_GPL(mddev_suspend);
324 void mddev_resume(struct mddev *mddev)
326 if (--mddev->suspended)
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 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
401 atomic_inc(&mddev->flush_pending);
404 rdev_dec_pending(rdev, mddev);
407 if (atomic_dec_and_test(&mddev->flush_pending))
408 queue_work(md_wq, &mddev->flush_work);
411 static void md_submit_flush_data(struct work_struct *ws)
413 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
414 struct bio *bio = mddev->flush_bio;
416 if (bio->bi_iter.bi_size == 0)
417 /* an empty barrier - all done */
420 bio->bi_opf &= ~REQ_PREFLUSH;
421 mddev->pers->make_request(mddev, bio);
424 mddev->flush_bio = NULL;
425 wake_up(&mddev->sb_wait);
428 void md_flush_request(struct mddev *mddev, struct bio *bio)
430 spin_lock_irq(&mddev->lock);
431 wait_event_lock_irq(mddev->sb_wait,
434 mddev->flush_bio = bio;
435 spin_unlock_irq(&mddev->lock);
437 INIT_WORK(&mddev->flush_work, submit_flushes);
438 queue_work(md_wq, &mddev->flush_work);
440 EXPORT_SYMBOL(md_flush_request);
442 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
444 struct mddev *mddev = cb->data;
445 md_wakeup_thread(mddev->thread);
448 EXPORT_SYMBOL(md_unplug);
450 static inline struct mddev *mddev_get(struct mddev *mddev)
452 atomic_inc(&mddev->active);
456 static void mddev_delayed_delete(struct work_struct *ws);
458 static void mddev_put(struct mddev *mddev)
460 struct bio_set *bs = NULL;
462 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
464 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
465 mddev->ctime == 0 && !mddev->hold_active) {
466 /* Array is not configured at all, and not held active,
468 list_del_init(&mddev->all_mddevs);
470 mddev->bio_set = NULL;
471 if (mddev->gendisk) {
472 /* We did a probe so need to clean up. Call
473 * queue_work inside the spinlock so that
474 * flush_workqueue() after mddev_find will
475 * succeed in waiting for the work to be done.
477 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
478 queue_work(md_misc_wq, &mddev->del_work);
482 spin_unlock(&all_mddevs_lock);
487 static void md_safemode_timeout(unsigned long data);
489 void mddev_init(struct mddev *mddev)
491 mutex_init(&mddev->open_mutex);
492 mutex_init(&mddev->reconfig_mutex);
493 mutex_init(&mddev->bitmap_info.mutex);
494 INIT_LIST_HEAD(&mddev->disks);
495 INIT_LIST_HEAD(&mddev->all_mddevs);
496 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
497 (unsigned long) mddev);
498 atomic_set(&mddev->active, 1);
499 atomic_set(&mddev->openers, 0);
500 atomic_set(&mddev->active_io, 0);
501 spin_lock_init(&mddev->lock);
502 atomic_set(&mddev->flush_pending, 0);
503 init_waitqueue_head(&mddev->sb_wait);
504 init_waitqueue_head(&mddev->recovery_wait);
505 mddev->reshape_position = MaxSector;
506 mddev->reshape_backwards = 0;
507 mddev->last_sync_action = "none";
508 mddev->resync_min = 0;
509 mddev->resync_max = MaxSector;
510 mddev->level = LEVEL_NONE;
512 EXPORT_SYMBOL_GPL(mddev_init);
514 static struct mddev *mddev_find(dev_t unit)
516 struct mddev *mddev, *new = NULL;
518 if (unit && MAJOR(unit) != MD_MAJOR)
519 unit &= ~((1<<MdpMinorShift)-1);
522 spin_lock(&all_mddevs_lock);
525 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
526 if (mddev->unit == unit) {
528 spin_unlock(&all_mddevs_lock);
534 list_add(&new->all_mddevs, &all_mddevs);
535 spin_unlock(&all_mddevs_lock);
536 new->hold_active = UNTIL_IOCTL;
540 /* find an unused unit number */
541 static int next_minor = 512;
542 int start = next_minor;
546 dev = MKDEV(MD_MAJOR, next_minor);
548 if (next_minor > MINORMASK)
550 if (next_minor == start) {
551 /* Oh dear, all in use. */
552 spin_unlock(&all_mddevs_lock);
558 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
559 if (mddev->unit == dev) {
565 new->md_minor = MINOR(dev);
566 new->hold_active = UNTIL_STOP;
567 list_add(&new->all_mddevs, &all_mddevs);
568 spin_unlock(&all_mddevs_lock);
571 spin_unlock(&all_mddevs_lock);
573 new = kzalloc(sizeof(*new), GFP_KERNEL);
578 if (MAJOR(unit) == MD_MAJOR)
579 new->md_minor = MINOR(unit);
581 new->md_minor = MINOR(unit) >> MdpMinorShift;
588 static struct attribute_group md_redundancy_group;
590 void mddev_unlock(struct mddev *mddev)
592 if (mddev->to_remove) {
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
605 struct attribute_group *to_remove = mddev->to_remove;
606 mddev->to_remove = NULL;
607 mddev->sysfs_active = 1;
608 mutex_unlock(&mddev->reconfig_mutex);
610 if (mddev->kobj.sd) {
611 if (to_remove != &md_redundancy_group)
612 sysfs_remove_group(&mddev->kobj, to_remove);
613 if (mddev->pers == NULL ||
614 mddev->pers->sync_request == NULL) {
615 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
616 if (mddev->sysfs_action)
617 sysfs_put(mddev->sysfs_action);
618 mddev->sysfs_action = NULL;
621 mddev->sysfs_active = 0;
623 mutex_unlock(&mddev->reconfig_mutex);
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
628 spin_lock(&pers_lock);
629 md_wakeup_thread(mddev->thread);
630 spin_unlock(&pers_lock);
632 EXPORT_SYMBOL_GPL(mddev_unlock);
634 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
636 struct md_rdev *rdev;
638 rdev_for_each_rcu(rdev, mddev)
639 if (rdev->desc_nr == nr)
644 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
646 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
648 struct md_rdev *rdev;
650 rdev_for_each(rdev, mddev)
651 if (rdev->bdev->bd_dev == dev)
657 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
659 struct md_rdev *rdev;
661 rdev_for_each_rcu(rdev, mddev)
662 if (rdev->bdev->bd_dev == dev)
668 static struct md_personality *find_pers(int level, char *clevel)
670 struct md_personality *pers;
671 list_for_each_entry(pers, &pers_list, list) {
672 if (level != LEVEL_NONE && pers->level == level)
674 if (strcmp(pers->name, clevel)==0)
680 /* return the offset of the super block in 512byte sectors */
681 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
683 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
684 return MD_NEW_SIZE_SECTORS(num_sectors);
687 static int alloc_disk_sb(struct md_rdev *rdev)
689 rdev->sb_page = alloc_page(GFP_KERNEL);
695 void md_rdev_clear(struct md_rdev *rdev)
698 put_page(rdev->sb_page);
700 rdev->sb_page = NULL;
705 put_page(rdev->bb_page);
706 rdev->bb_page = NULL;
708 badblocks_exit(&rdev->badblocks);
710 EXPORT_SYMBOL_GPL(md_rdev_clear);
712 static void super_written(struct bio *bio)
714 struct md_rdev *rdev = bio->bi_private;
715 struct mddev *mddev = rdev->mddev;
718 pr_err("md: super_written gets error=%d\n", bio->bi_error);
719 md_error(mddev, rdev);
720 if (!test_bit(Faulty, &rdev->flags)
721 && (bio->bi_opf & MD_FAILFAST)) {
722 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
723 set_bit(LastDev, &rdev->flags);
726 clear_bit(LastDev, &rdev->flags);
728 if (atomic_dec_and_test(&mddev->pending_writes))
729 wake_up(&mddev->sb_wait);
730 rdev_dec_pending(rdev, mddev);
734 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
735 sector_t sector, int size, struct page *page)
737 /* write first size bytes of page to sector of rdev
738 * Increment mddev->pending_writes before returning
739 * and decrement it on completion, waking up sb_wait
740 * if zero is reached.
741 * If an error occurred, call md_error
746 if (test_bit(Faulty, &rdev->flags))
749 bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
751 atomic_inc(&rdev->nr_pending);
753 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
754 bio->bi_iter.bi_sector = sector;
755 bio_add_page(bio, page, size, 0);
756 bio->bi_private = rdev;
757 bio->bi_end_io = super_written;
759 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
760 test_bit(FailFast, &rdev->flags) &&
761 !test_bit(LastDev, &rdev->flags))
763 bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_FUA | ff;
765 atomic_inc(&mddev->pending_writes);
769 int md_super_wait(struct mddev *mddev)
771 /* wait for all superblock writes that were scheduled to complete */
772 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
773 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
778 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
779 struct page *page, int op, int op_flags, bool metadata_op)
781 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
784 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
785 rdev->meta_bdev : rdev->bdev;
786 bio_set_op_attrs(bio, op, op_flags);
788 bio->bi_iter.bi_sector = sector + rdev->sb_start;
789 else if (rdev->mddev->reshape_position != MaxSector &&
790 (rdev->mddev->reshape_backwards ==
791 (sector >= rdev->mddev->reshape_position)))
792 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
794 bio->bi_iter.bi_sector = sector + rdev->data_offset;
795 bio_add_page(bio, page, size, 0);
797 submit_bio_wait(bio);
799 ret = !bio->bi_error;
803 EXPORT_SYMBOL_GPL(sync_page_io);
805 static int read_disk_sb(struct md_rdev *rdev, int size)
807 char b[BDEVNAME_SIZE];
812 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
818 pr_err("md: disabled device %s, could not read superblock.\n",
819 bdevname(rdev->bdev,b));
823 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
825 return sb1->set_uuid0 == sb2->set_uuid0 &&
826 sb1->set_uuid1 == sb2->set_uuid1 &&
827 sb1->set_uuid2 == sb2->set_uuid2 &&
828 sb1->set_uuid3 == sb2->set_uuid3;
831 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
834 mdp_super_t *tmp1, *tmp2;
836 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
837 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
839 if (!tmp1 || !tmp2) {
848 * nr_disks is not constant
853 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
860 static u32 md_csum_fold(u32 csum)
862 csum = (csum & 0xffff) + (csum >> 16);
863 return (csum & 0xffff) + (csum >> 16);
866 static unsigned int calc_sb_csum(mdp_super_t *sb)
869 u32 *sb32 = (u32*)sb;
871 unsigned int disk_csum, csum;
873 disk_csum = sb->sb_csum;
876 for (i = 0; i < MD_SB_BYTES/4 ; i++)
878 csum = (newcsum & 0xffffffff) + (newcsum>>32);
881 /* This used to use csum_partial, which was wrong for several
882 * reasons including that different results are returned on
883 * different architectures. It isn't critical that we get exactly
884 * the same return value as before (we always csum_fold before
885 * testing, and that removes any differences). However as we
886 * know that csum_partial always returned a 16bit value on
887 * alphas, do a fold to maximise conformity to previous behaviour.
889 sb->sb_csum = md_csum_fold(disk_csum);
891 sb->sb_csum = disk_csum;
897 * Handle superblock details.
898 * We want to be able to handle multiple superblock formats
899 * so we have a common interface to them all, and an array of
900 * different handlers.
901 * We rely on user-space to write the initial superblock, and support
902 * reading and updating of superblocks.
903 * Interface methods are:
904 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
905 * loads and validates a superblock on dev.
906 * if refdev != NULL, compare superblocks on both devices
908 * 0 - dev has a superblock that is compatible with refdev
909 * 1 - dev has a superblock that is compatible and newer than refdev
910 * so dev should be used as the refdev in future
911 * -EINVAL superblock incompatible or invalid
912 * -othererror e.g. -EIO
914 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
915 * Verify that dev is acceptable into mddev.
916 * The first time, mddev->raid_disks will be 0, and data from
917 * dev should be merged in. Subsequent calls check that dev
918 * is new enough. Return 0 or -EINVAL
920 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
921 * Update the superblock for rdev with data in mddev
922 * This does not write to disc.
928 struct module *owner;
929 int (*load_super)(struct md_rdev *rdev,
930 struct md_rdev *refdev,
932 int (*validate_super)(struct mddev *mddev,
933 struct md_rdev *rdev);
934 void (*sync_super)(struct mddev *mddev,
935 struct md_rdev *rdev);
936 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
937 sector_t num_sectors);
938 int (*allow_new_offset)(struct md_rdev *rdev,
939 unsigned long long new_offset);
943 * Check that the given mddev has no bitmap.
945 * This function is called from the run method of all personalities that do not
946 * support bitmaps. It prints an error message and returns non-zero if mddev
947 * has a bitmap. Otherwise, it returns 0.
950 int md_check_no_bitmap(struct mddev *mddev)
952 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
954 pr_warn("%s: bitmaps are not supported for %s\n",
955 mdname(mddev), mddev->pers->name);
958 EXPORT_SYMBOL(md_check_no_bitmap);
961 * load_super for 0.90.0
963 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
965 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
970 * Calculate the position of the superblock (512byte sectors),
971 * it's at the end of the disk.
973 * It also happens to be a multiple of 4Kb.
975 rdev->sb_start = calc_dev_sboffset(rdev);
977 ret = read_disk_sb(rdev, MD_SB_BYTES);
983 bdevname(rdev->bdev, b);
984 sb = page_address(rdev->sb_page);
986 if (sb->md_magic != MD_SB_MAGIC) {
987 pr_warn("md: invalid raid superblock magic on %s\n", b);
991 if (sb->major_version != 0 ||
992 sb->minor_version < 90 ||
993 sb->minor_version > 91) {
994 pr_warn("Bad version number %d.%d on %s\n",
995 sb->major_version, sb->minor_version, b);
999 if (sb->raid_disks <= 0)
1002 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1003 pr_warn("md: invalid superblock checksum on %s\n", b);
1007 rdev->preferred_minor = sb->md_minor;
1008 rdev->data_offset = 0;
1009 rdev->new_data_offset = 0;
1010 rdev->sb_size = MD_SB_BYTES;
1011 rdev->badblocks.shift = -1;
1013 if (sb->level == LEVEL_MULTIPATH)
1016 rdev->desc_nr = sb->this_disk.number;
1022 mdp_super_t *refsb = page_address(refdev->sb_page);
1023 if (!uuid_equal(refsb, sb)) {
1024 pr_warn("md: %s has different UUID to %s\n",
1025 b, bdevname(refdev->bdev,b2));
1028 if (!sb_equal(refsb, sb)) {
1029 pr_warn("md: %s has same UUID but different superblock to %s\n",
1030 b, bdevname(refdev->bdev, b2));
1034 ev2 = md_event(refsb);
1040 rdev->sectors = rdev->sb_start;
1041 /* Limit to 4TB as metadata cannot record more than that.
1042 * (not needed for Linear and RAID0 as metadata doesn't
1045 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1047 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1049 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1050 /* "this cannot possibly happen" ... */
1058 * validate_super for 0.90.0
1060 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1063 mdp_super_t *sb = page_address(rdev->sb_page);
1064 __u64 ev1 = md_event(sb);
1066 rdev->raid_disk = -1;
1067 clear_bit(Faulty, &rdev->flags);
1068 clear_bit(In_sync, &rdev->flags);
1069 clear_bit(Bitmap_sync, &rdev->flags);
1070 clear_bit(WriteMostly, &rdev->flags);
1072 if (mddev->raid_disks == 0) {
1073 mddev->major_version = 0;
1074 mddev->minor_version = sb->minor_version;
1075 mddev->patch_version = sb->patch_version;
1076 mddev->external = 0;
1077 mddev->chunk_sectors = sb->chunk_size >> 9;
1078 mddev->ctime = sb->ctime;
1079 mddev->utime = sb->utime;
1080 mddev->level = sb->level;
1081 mddev->clevel[0] = 0;
1082 mddev->layout = sb->layout;
1083 mddev->raid_disks = sb->raid_disks;
1084 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1085 mddev->events = ev1;
1086 mddev->bitmap_info.offset = 0;
1087 mddev->bitmap_info.space = 0;
1088 /* bitmap can use 60 K after the 4K superblocks */
1089 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1090 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1091 mddev->reshape_backwards = 0;
1093 if (mddev->minor_version >= 91) {
1094 mddev->reshape_position = sb->reshape_position;
1095 mddev->delta_disks = sb->delta_disks;
1096 mddev->new_level = sb->new_level;
1097 mddev->new_layout = sb->new_layout;
1098 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1099 if (mddev->delta_disks < 0)
1100 mddev->reshape_backwards = 1;
1102 mddev->reshape_position = MaxSector;
1103 mddev->delta_disks = 0;
1104 mddev->new_level = mddev->level;
1105 mddev->new_layout = mddev->layout;
1106 mddev->new_chunk_sectors = mddev->chunk_sectors;
1109 if (sb->state & (1<<MD_SB_CLEAN))
1110 mddev->recovery_cp = MaxSector;
1112 if (sb->events_hi == sb->cp_events_hi &&
1113 sb->events_lo == sb->cp_events_lo) {
1114 mddev->recovery_cp = sb->recovery_cp;
1116 mddev->recovery_cp = 0;
1119 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1120 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1121 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1122 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1124 mddev->max_disks = MD_SB_DISKS;
1126 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1127 mddev->bitmap_info.file == NULL) {
1128 mddev->bitmap_info.offset =
1129 mddev->bitmap_info.default_offset;
1130 mddev->bitmap_info.space =
1131 mddev->bitmap_info.default_space;
1134 } else if (mddev->pers == NULL) {
1135 /* Insist on good event counter while assembling, except
1136 * for spares (which don't need an event count) */
1138 if (sb->disks[rdev->desc_nr].state & (
1139 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1140 if (ev1 < mddev->events)
1142 } else if (mddev->bitmap) {
1143 /* if adding to array with a bitmap, then we can accept an
1144 * older device ... but not too old.
1146 if (ev1 < mddev->bitmap->events_cleared)
1148 if (ev1 < mddev->events)
1149 set_bit(Bitmap_sync, &rdev->flags);
1151 if (ev1 < mddev->events)
1152 /* just a hot-add of a new device, leave raid_disk at -1 */
1156 if (mddev->level != LEVEL_MULTIPATH) {
1157 desc = sb->disks + rdev->desc_nr;
1159 if (desc->state & (1<<MD_DISK_FAULTY))
1160 set_bit(Faulty, &rdev->flags);
1161 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1162 desc->raid_disk < mddev->raid_disks */) {
1163 set_bit(In_sync, &rdev->flags);
1164 rdev->raid_disk = desc->raid_disk;
1165 rdev->saved_raid_disk = desc->raid_disk;
1166 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1167 /* active but not in sync implies recovery up to
1168 * reshape position. We don't know exactly where
1169 * that is, so set to zero for now */
1170 if (mddev->minor_version >= 91) {
1171 rdev->recovery_offset = 0;
1172 rdev->raid_disk = desc->raid_disk;
1175 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1176 set_bit(WriteMostly, &rdev->flags);
1177 if (desc->state & (1<<MD_DISK_FAILFAST))
1178 set_bit(FailFast, &rdev->flags);
1179 } else /* MULTIPATH are always insync */
1180 set_bit(In_sync, &rdev->flags);
1185 * sync_super for 0.90.0
1187 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1190 struct md_rdev *rdev2;
1191 int next_spare = mddev->raid_disks;
1193 /* make rdev->sb match mddev data..
1196 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1197 * 3/ any empty disks < next_spare become removed
1199 * disks[0] gets initialised to REMOVED because
1200 * we cannot be sure from other fields if it has
1201 * been initialised or not.
1204 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1206 rdev->sb_size = MD_SB_BYTES;
1208 sb = page_address(rdev->sb_page);
1210 memset(sb, 0, sizeof(*sb));
1212 sb->md_magic = MD_SB_MAGIC;
1213 sb->major_version = mddev->major_version;
1214 sb->patch_version = mddev->patch_version;
1215 sb->gvalid_words = 0; /* ignored */
1216 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1217 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1218 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1219 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1221 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1222 sb->level = mddev->level;
1223 sb->size = mddev->dev_sectors / 2;
1224 sb->raid_disks = mddev->raid_disks;
1225 sb->md_minor = mddev->md_minor;
1226 sb->not_persistent = 0;
1227 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1229 sb->events_hi = (mddev->events>>32);
1230 sb->events_lo = (u32)mddev->events;
1232 if (mddev->reshape_position == MaxSector)
1233 sb->minor_version = 90;
1235 sb->minor_version = 91;
1236 sb->reshape_position = mddev->reshape_position;
1237 sb->new_level = mddev->new_level;
1238 sb->delta_disks = mddev->delta_disks;
1239 sb->new_layout = mddev->new_layout;
1240 sb->new_chunk = mddev->new_chunk_sectors << 9;
1242 mddev->minor_version = sb->minor_version;
1245 sb->recovery_cp = mddev->recovery_cp;
1246 sb->cp_events_hi = (mddev->events>>32);
1247 sb->cp_events_lo = (u32)mddev->events;
1248 if (mddev->recovery_cp == MaxSector)
1249 sb->state = (1<< MD_SB_CLEAN);
1251 sb->recovery_cp = 0;
1253 sb->layout = mddev->layout;
1254 sb->chunk_size = mddev->chunk_sectors << 9;
1256 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1257 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1259 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1260 rdev_for_each(rdev2, mddev) {
1263 int is_active = test_bit(In_sync, &rdev2->flags);
1265 if (rdev2->raid_disk >= 0 &&
1266 sb->minor_version >= 91)
1267 /* we have nowhere to store the recovery_offset,
1268 * but if it is not below the reshape_position,
1269 * we can piggy-back on that.
1272 if (rdev2->raid_disk < 0 ||
1273 test_bit(Faulty, &rdev2->flags))
1276 desc_nr = rdev2->raid_disk;
1278 desc_nr = next_spare++;
1279 rdev2->desc_nr = desc_nr;
1280 d = &sb->disks[rdev2->desc_nr];
1282 d->number = rdev2->desc_nr;
1283 d->major = MAJOR(rdev2->bdev->bd_dev);
1284 d->minor = MINOR(rdev2->bdev->bd_dev);
1286 d->raid_disk = rdev2->raid_disk;
1288 d->raid_disk = rdev2->desc_nr; /* compatibility */
1289 if (test_bit(Faulty, &rdev2->flags))
1290 d->state = (1<<MD_DISK_FAULTY);
1291 else if (is_active) {
1292 d->state = (1<<MD_DISK_ACTIVE);
1293 if (test_bit(In_sync, &rdev2->flags))
1294 d->state |= (1<<MD_DISK_SYNC);
1302 if (test_bit(WriteMostly, &rdev2->flags))
1303 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1304 if (test_bit(FailFast, &rdev2->flags))
1305 d->state |= (1<<MD_DISK_FAILFAST);
1307 /* now set the "removed" and "faulty" bits on any missing devices */
1308 for (i=0 ; i < mddev->raid_disks ; i++) {
1309 mdp_disk_t *d = &sb->disks[i];
1310 if (d->state == 0 && d->number == 0) {
1313 d->state = (1<<MD_DISK_REMOVED);
1314 d->state |= (1<<MD_DISK_FAULTY);
1318 sb->nr_disks = nr_disks;
1319 sb->active_disks = active;
1320 sb->working_disks = working;
1321 sb->failed_disks = failed;
1322 sb->spare_disks = spare;
1324 sb->this_disk = sb->disks[rdev->desc_nr];
1325 sb->sb_csum = calc_sb_csum(sb);
1329 * rdev_size_change for 0.90.0
1331 static unsigned long long
1332 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1334 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1335 return 0; /* component must fit device */
1336 if (rdev->mddev->bitmap_info.offset)
1337 return 0; /* can't move bitmap */
1338 rdev->sb_start = calc_dev_sboffset(rdev);
1339 if (!num_sectors || num_sectors > rdev->sb_start)
1340 num_sectors = rdev->sb_start;
1341 /* Limit to 4TB as metadata cannot record more than that.
1342 * 4TB == 2^32 KB, or 2*2^32 sectors.
1344 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1345 rdev->mddev->level >= 1)
1346 num_sectors = (sector_t)(2ULL << 32) - 2;
1348 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1350 } while (md_super_wait(rdev->mddev) < 0);
1355 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1357 /* non-zero offset changes not possible with v0.90 */
1358 return new_offset == 0;
1362 * version 1 superblock
1365 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1369 unsigned long long newcsum;
1370 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1371 __le32 *isuper = (__le32*)sb;
1373 disk_csum = sb->sb_csum;
1376 for (; size >= 4; size -= 4)
1377 newcsum += le32_to_cpu(*isuper++);
1380 newcsum += le16_to_cpu(*(__le16*) isuper);
1382 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1383 sb->sb_csum = disk_csum;
1384 return cpu_to_le32(csum);
1387 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1389 struct mdp_superblock_1 *sb;
1393 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1397 * Calculate the position of the superblock in 512byte sectors.
1398 * It is always aligned to a 4K boundary and
1399 * depeding on minor_version, it can be:
1400 * 0: At least 8K, but less than 12K, from end of device
1401 * 1: At start of device
1402 * 2: 4K from start of device.
1404 switch(minor_version) {
1406 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1408 sb_start &= ~(sector_t)(4*2-1);
1419 rdev->sb_start = sb_start;
1421 /* superblock is rarely larger than 1K, but it can be larger,
1422 * and it is safe to read 4k, so we do that
1424 ret = read_disk_sb(rdev, 4096);
1425 if (ret) return ret;
1427 sb = page_address(rdev->sb_page);
1429 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1430 sb->major_version != cpu_to_le32(1) ||
1431 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1432 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1433 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1436 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1437 pr_warn("md: invalid superblock checksum on %s\n",
1438 bdevname(rdev->bdev,b));
1441 if (le64_to_cpu(sb->data_size) < 10) {
1442 pr_warn("md: data_size too small on %s\n",
1443 bdevname(rdev->bdev,b));
1448 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1449 /* Some padding is non-zero, might be a new feature */
1452 rdev->preferred_minor = 0xffff;
1453 rdev->data_offset = le64_to_cpu(sb->data_offset);
1454 rdev->new_data_offset = rdev->data_offset;
1455 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1456 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1457 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1458 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1460 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1461 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1462 if (rdev->sb_size & bmask)
1463 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1466 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1469 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1472 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1475 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1477 if (!rdev->bb_page) {
1478 rdev->bb_page = alloc_page(GFP_KERNEL);
1482 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1483 rdev->badblocks.count == 0) {
1484 /* need to load the bad block list.
1485 * Currently we limit it to one page.
1491 int sectors = le16_to_cpu(sb->bblog_size);
1492 if (sectors > (PAGE_SIZE / 512))
1494 offset = le32_to_cpu(sb->bblog_offset);
1497 bb_sector = (long long)offset;
1498 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1499 rdev->bb_page, REQ_OP_READ, 0, true))
1501 bbp = (u64 *)page_address(rdev->bb_page);
1502 rdev->badblocks.shift = sb->bblog_shift;
1503 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1504 u64 bb = le64_to_cpu(*bbp);
1505 int count = bb & (0x3ff);
1506 u64 sector = bb >> 10;
1507 sector <<= sb->bblog_shift;
1508 count <<= sb->bblog_shift;
1511 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1514 } else if (sb->bblog_offset != 0)
1515 rdev->badblocks.shift = 0;
1521 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1523 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1524 sb->level != refsb->level ||
1525 sb->layout != refsb->layout ||
1526 sb->chunksize != refsb->chunksize) {
1527 pr_warn("md: %s has strangely different superblock to %s\n",
1528 bdevname(rdev->bdev,b),
1529 bdevname(refdev->bdev,b2));
1532 ev1 = le64_to_cpu(sb->events);
1533 ev2 = le64_to_cpu(refsb->events);
1540 if (minor_version) {
1541 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1542 sectors -= rdev->data_offset;
1544 sectors = rdev->sb_start;
1545 if (sectors < le64_to_cpu(sb->data_size))
1547 rdev->sectors = le64_to_cpu(sb->data_size);
1551 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1553 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1554 __u64 ev1 = le64_to_cpu(sb->events);
1556 rdev->raid_disk = -1;
1557 clear_bit(Faulty, &rdev->flags);
1558 clear_bit(In_sync, &rdev->flags);
1559 clear_bit(Bitmap_sync, &rdev->flags);
1560 clear_bit(WriteMostly, &rdev->flags);
1562 if (mddev->raid_disks == 0) {
1563 mddev->major_version = 1;
1564 mddev->patch_version = 0;
1565 mddev->external = 0;
1566 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1567 mddev->ctime = le64_to_cpu(sb->ctime);
1568 mddev->utime = le64_to_cpu(sb->utime);
1569 mddev->level = le32_to_cpu(sb->level);
1570 mddev->clevel[0] = 0;
1571 mddev->layout = le32_to_cpu(sb->layout);
1572 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1573 mddev->dev_sectors = le64_to_cpu(sb->size);
1574 mddev->events = ev1;
1575 mddev->bitmap_info.offset = 0;
1576 mddev->bitmap_info.space = 0;
1577 /* Default location for bitmap is 1K after superblock
1578 * using 3K - total of 4K
1580 mddev->bitmap_info.default_offset = 1024 >> 9;
1581 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1582 mddev->reshape_backwards = 0;
1584 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1585 memcpy(mddev->uuid, sb->set_uuid, 16);
1587 mddev->max_disks = (4096-256)/2;
1589 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1590 mddev->bitmap_info.file == NULL) {
1591 mddev->bitmap_info.offset =
1592 (__s32)le32_to_cpu(sb->bitmap_offset);
1593 /* Metadata doesn't record how much space is available.
1594 * For 1.0, we assume we can use up to the superblock
1595 * if before, else to 4K beyond superblock.
1596 * For others, assume no change is possible.
1598 if (mddev->minor_version > 0)
1599 mddev->bitmap_info.space = 0;
1600 else if (mddev->bitmap_info.offset > 0)
1601 mddev->bitmap_info.space =
1602 8 - mddev->bitmap_info.offset;
1604 mddev->bitmap_info.space =
1605 -mddev->bitmap_info.offset;
1608 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1609 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1610 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1611 mddev->new_level = le32_to_cpu(sb->new_level);
1612 mddev->new_layout = le32_to_cpu(sb->new_layout);
1613 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1614 if (mddev->delta_disks < 0 ||
1615 (mddev->delta_disks == 0 &&
1616 (le32_to_cpu(sb->feature_map)
1617 & MD_FEATURE_RESHAPE_BACKWARDS)))
1618 mddev->reshape_backwards = 1;
1620 mddev->reshape_position = MaxSector;
1621 mddev->delta_disks = 0;
1622 mddev->new_level = mddev->level;
1623 mddev->new_layout = mddev->layout;
1624 mddev->new_chunk_sectors = mddev->chunk_sectors;
1627 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1628 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1629 } else if (mddev->pers == NULL) {
1630 /* Insist of good event counter while assembling, except for
1631 * spares (which don't need an event count) */
1633 if (rdev->desc_nr >= 0 &&
1634 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1635 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1636 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1637 if (ev1 < mddev->events)
1639 } else if (mddev->bitmap) {
1640 /* If adding to array with a bitmap, then we can accept an
1641 * older device, but not too old.
1643 if (ev1 < mddev->bitmap->events_cleared)
1645 if (ev1 < mddev->events)
1646 set_bit(Bitmap_sync, &rdev->flags);
1648 if (ev1 < mddev->events)
1649 /* just a hot-add of a new device, leave raid_disk at -1 */
1652 if (mddev->level != LEVEL_MULTIPATH) {
1654 if (rdev->desc_nr < 0 ||
1655 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1656 role = MD_DISK_ROLE_SPARE;
1659 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1661 case MD_DISK_ROLE_SPARE: /* spare */
1663 case MD_DISK_ROLE_FAULTY: /* faulty */
1664 set_bit(Faulty, &rdev->flags);
1666 case MD_DISK_ROLE_JOURNAL: /* journal device */
1667 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1668 /* journal device without journal feature */
1669 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1672 set_bit(Journal, &rdev->flags);
1673 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1674 rdev->raid_disk = 0;
1677 rdev->saved_raid_disk = role;
1678 if ((le32_to_cpu(sb->feature_map) &
1679 MD_FEATURE_RECOVERY_OFFSET)) {
1680 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1681 if (!(le32_to_cpu(sb->feature_map) &
1682 MD_FEATURE_RECOVERY_BITMAP))
1683 rdev->saved_raid_disk = -1;
1685 set_bit(In_sync, &rdev->flags);
1686 rdev->raid_disk = role;
1689 if (sb->devflags & WriteMostly1)
1690 set_bit(WriteMostly, &rdev->flags);
1691 if (sb->devflags & FailFast1)
1692 set_bit(FailFast, &rdev->flags);
1693 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1694 set_bit(Replacement, &rdev->flags);
1695 } else /* MULTIPATH are always insync */
1696 set_bit(In_sync, &rdev->flags);
1701 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1703 struct mdp_superblock_1 *sb;
1704 struct md_rdev *rdev2;
1706 /* make rdev->sb match mddev and rdev data. */
1708 sb = page_address(rdev->sb_page);
1710 sb->feature_map = 0;
1712 sb->recovery_offset = cpu_to_le64(0);
1713 memset(sb->pad3, 0, sizeof(sb->pad3));
1715 sb->utime = cpu_to_le64((__u64)mddev->utime);
1716 sb->events = cpu_to_le64(mddev->events);
1718 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1719 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1720 sb->resync_offset = cpu_to_le64(MaxSector);
1722 sb->resync_offset = cpu_to_le64(0);
1724 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1726 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1727 sb->size = cpu_to_le64(mddev->dev_sectors);
1728 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1729 sb->level = cpu_to_le32(mddev->level);
1730 sb->layout = cpu_to_le32(mddev->layout);
1731 if (test_bit(FailFast, &rdev->flags))
1732 sb->devflags |= FailFast1;
1734 sb->devflags &= ~FailFast1;
1736 if (test_bit(WriteMostly, &rdev->flags))
1737 sb->devflags |= WriteMostly1;
1739 sb->devflags &= ~WriteMostly1;
1740 sb->data_offset = cpu_to_le64(rdev->data_offset);
1741 sb->data_size = cpu_to_le64(rdev->sectors);
1743 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1744 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1745 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1748 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1749 !test_bit(In_sync, &rdev->flags)) {
1751 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1752 sb->recovery_offset =
1753 cpu_to_le64(rdev->recovery_offset);
1754 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1756 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1758 /* Note: recovery_offset and journal_tail share space */
1759 if (test_bit(Journal, &rdev->flags))
1760 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1761 if (test_bit(Replacement, &rdev->flags))
1763 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1765 if (mddev->reshape_position != MaxSector) {
1766 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1767 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1768 sb->new_layout = cpu_to_le32(mddev->new_layout);
1769 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1770 sb->new_level = cpu_to_le32(mddev->new_level);
1771 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1772 if (mddev->delta_disks == 0 &&
1773 mddev->reshape_backwards)
1775 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1776 if (rdev->new_data_offset != rdev->data_offset) {
1778 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1779 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1780 - rdev->data_offset));
1784 if (mddev_is_clustered(mddev))
1785 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1787 if (rdev->badblocks.count == 0)
1788 /* Nothing to do for bad blocks*/ ;
1789 else if (sb->bblog_offset == 0)
1790 /* Cannot record bad blocks on this device */
1791 md_error(mddev, rdev);
1793 struct badblocks *bb = &rdev->badblocks;
1794 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1796 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1801 seq = read_seqbegin(&bb->lock);
1803 memset(bbp, 0xff, PAGE_SIZE);
1805 for (i = 0 ; i < bb->count ; i++) {
1806 u64 internal_bb = p[i];
1807 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1808 | BB_LEN(internal_bb));
1809 bbp[i] = cpu_to_le64(store_bb);
1812 if (read_seqretry(&bb->lock, seq))
1815 bb->sector = (rdev->sb_start +
1816 (int)le32_to_cpu(sb->bblog_offset));
1817 bb->size = le16_to_cpu(sb->bblog_size);
1822 rdev_for_each(rdev2, mddev)
1823 if (rdev2->desc_nr+1 > max_dev)
1824 max_dev = rdev2->desc_nr+1;
1826 if (max_dev > le32_to_cpu(sb->max_dev)) {
1828 sb->max_dev = cpu_to_le32(max_dev);
1829 rdev->sb_size = max_dev * 2 + 256;
1830 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1831 if (rdev->sb_size & bmask)
1832 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1834 max_dev = le32_to_cpu(sb->max_dev);
1836 for (i=0; i<max_dev;i++)
1837 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1839 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1840 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1842 rdev_for_each(rdev2, mddev) {
1844 if (test_bit(Faulty, &rdev2->flags))
1845 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1846 else if (test_bit(In_sync, &rdev2->flags))
1847 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1848 else if (test_bit(Journal, &rdev2->flags))
1849 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1850 else if (rdev2->raid_disk >= 0)
1851 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1853 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1856 sb->sb_csum = calc_sb_1_csum(sb);
1859 static unsigned long long
1860 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1862 struct mdp_superblock_1 *sb;
1863 sector_t max_sectors;
1864 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1865 return 0; /* component must fit device */
1866 if (rdev->data_offset != rdev->new_data_offset)
1867 return 0; /* too confusing */
1868 if (rdev->sb_start < rdev->data_offset) {
1869 /* minor versions 1 and 2; superblock before data */
1870 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1871 max_sectors -= rdev->data_offset;
1872 if (!num_sectors || num_sectors > max_sectors)
1873 num_sectors = max_sectors;
1874 } else if (rdev->mddev->bitmap_info.offset) {
1875 /* minor version 0 with bitmap we can't move */
1878 /* minor version 0; superblock after data */
1880 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1881 sb_start &= ~(sector_t)(4*2 - 1);
1882 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1883 if (!num_sectors || num_sectors > max_sectors)
1884 num_sectors = max_sectors;
1885 rdev->sb_start = sb_start;
1887 sb = page_address(rdev->sb_page);
1888 sb->data_size = cpu_to_le64(num_sectors);
1889 sb->super_offset = rdev->sb_start;
1890 sb->sb_csum = calc_sb_1_csum(sb);
1892 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1894 } while (md_super_wait(rdev->mddev) < 0);
1900 super_1_allow_new_offset(struct md_rdev *rdev,
1901 unsigned long long new_offset)
1903 /* All necessary checks on new >= old have been done */
1904 struct bitmap *bitmap;
1905 if (new_offset >= rdev->data_offset)
1908 /* with 1.0 metadata, there is no metadata to tread on
1909 * so we can always move back */
1910 if (rdev->mddev->minor_version == 0)
1913 /* otherwise we must be sure not to step on
1914 * any metadata, so stay:
1915 * 36K beyond start of superblock
1916 * beyond end of badblocks
1917 * beyond write-intent bitmap
1919 if (rdev->sb_start + (32+4)*2 > new_offset)
1921 bitmap = rdev->mddev->bitmap;
1922 if (bitmap && !rdev->mddev->bitmap_info.file &&
1923 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1924 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1926 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1932 static struct super_type super_types[] = {
1935 .owner = THIS_MODULE,
1936 .load_super = super_90_load,
1937 .validate_super = super_90_validate,
1938 .sync_super = super_90_sync,
1939 .rdev_size_change = super_90_rdev_size_change,
1940 .allow_new_offset = super_90_allow_new_offset,
1944 .owner = THIS_MODULE,
1945 .load_super = super_1_load,
1946 .validate_super = super_1_validate,
1947 .sync_super = super_1_sync,
1948 .rdev_size_change = super_1_rdev_size_change,
1949 .allow_new_offset = super_1_allow_new_offset,
1953 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1955 if (mddev->sync_super) {
1956 mddev->sync_super(mddev, rdev);
1960 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1962 super_types[mddev->major_version].sync_super(mddev, rdev);
1965 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1967 struct md_rdev *rdev, *rdev2;
1970 rdev_for_each_rcu(rdev, mddev1) {
1971 if (test_bit(Faulty, &rdev->flags) ||
1972 test_bit(Journal, &rdev->flags) ||
1973 rdev->raid_disk == -1)
1975 rdev_for_each_rcu(rdev2, mddev2) {
1976 if (test_bit(Faulty, &rdev2->flags) ||
1977 test_bit(Journal, &rdev2->flags) ||
1978 rdev2->raid_disk == -1)
1980 if (rdev->bdev->bd_contains ==
1981 rdev2->bdev->bd_contains) {
1991 static LIST_HEAD(pending_raid_disks);
1994 * Try to register data integrity profile for an mddev
1996 * This is called when an array is started and after a disk has been kicked
1997 * from the array. It only succeeds if all working and active component devices
1998 * are integrity capable with matching profiles.
2000 int md_integrity_register(struct mddev *mddev)
2002 struct md_rdev *rdev, *reference = NULL;
2004 if (list_empty(&mddev->disks))
2005 return 0; /* nothing to do */
2006 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2007 return 0; /* shouldn't register, or already is */
2008 rdev_for_each(rdev, mddev) {
2009 /* skip spares and non-functional disks */
2010 if (test_bit(Faulty, &rdev->flags))
2012 if (rdev->raid_disk < 0)
2015 /* Use the first rdev as the reference */
2019 /* does this rdev's profile match the reference profile? */
2020 if (blk_integrity_compare(reference->bdev->bd_disk,
2021 rdev->bdev->bd_disk) < 0)
2024 if (!reference || !bdev_get_integrity(reference->bdev))
2027 * All component devices are integrity capable and have matching
2028 * profiles, register the common profile for the md device.
2030 blk_integrity_register(mddev->gendisk,
2031 bdev_get_integrity(reference->bdev));
2033 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2034 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2035 pr_err("md: failed to create integrity pool for %s\n",
2041 EXPORT_SYMBOL(md_integrity_register);
2044 * Attempt to add an rdev, but only if it is consistent with the current
2047 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2049 struct blk_integrity *bi_rdev;
2050 struct blk_integrity *bi_mddev;
2051 char name[BDEVNAME_SIZE];
2053 if (!mddev->gendisk)
2056 bi_rdev = bdev_get_integrity(rdev->bdev);
2057 bi_mddev = blk_get_integrity(mddev->gendisk);
2059 if (!bi_mddev) /* nothing to do */
2062 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2063 pr_err("%s: incompatible integrity profile for %s\n",
2064 mdname(mddev), bdevname(rdev->bdev, name));
2070 EXPORT_SYMBOL(md_integrity_add_rdev);
2072 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2074 char b[BDEVNAME_SIZE];
2078 /* prevent duplicates */
2079 if (find_rdev(mddev, rdev->bdev->bd_dev))
2082 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2083 if (!test_bit(Journal, &rdev->flags) &&
2085 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2087 /* Cannot change size, so fail
2088 * If mddev->level <= 0, then we don't care
2089 * about aligning sizes (e.g. linear)
2091 if (mddev->level > 0)
2094 mddev->dev_sectors = rdev->sectors;
2097 /* Verify rdev->desc_nr is unique.
2098 * If it is -1, assign a free number, else
2099 * check number is not in use
2102 if (rdev->desc_nr < 0) {
2105 choice = mddev->raid_disks;
2106 while (md_find_rdev_nr_rcu(mddev, choice))
2108 rdev->desc_nr = choice;
2110 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2116 if (!test_bit(Journal, &rdev->flags) &&
2117 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2118 pr_warn("md: %s: array is limited to %d devices\n",
2119 mdname(mddev), mddev->max_disks);
2122 bdevname(rdev->bdev,b);
2123 strreplace(b, '/', '!');
2125 rdev->mddev = mddev;
2126 pr_debug("md: bind<%s>\n", b);
2128 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2131 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2132 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2133 /* failure here is OK */;
2134 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2136 list_add_rcu(&rdev->same_set, &mddev->disks);
2137 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2139 /* May as well allow recovery to be retried once */
2140 mddev->recovery_disabled++;
2145 pr_warn("md: failed to register dev-%s for %s\n",
2150 static void md_delayed_delete(struct work_struct *ws)
2152 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2153 kobject_del(&rdev->kobj);
2154 kobject_put(&rdev->kobj);
2157 static void unbind_rdev_from_array(struct md_rdev *rdev)
2159 char b[BDEVNAME_SIZE];
2161 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2162 list_del_rcu(&rdev->same_set);
2163 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2165 sysfs_remove_link(&rdev->kobj, "block");
2166 sysfs_put(rdev->sysfs_state);
2167 rdev->sysfs_state = NULL;
2168 rdev->badblocks.count = 0;
2169 /* We need to delay this, otherwise we can deadlock when
2170 * writing to 'remove' to "dev/state". We also need
2171 * to delay it due to rcu usage.
2174 INIT_WORK(&rdev->del_work, md_delayed_delete);
2175 kobject_get(&rdev->kobj);
2176 queue_work(md_misc_wq, &rdev->del_work);
2180 * prevent the device from being mounted, repartitioned or
2181 * otherwise reused by a RAID array (or any other kernel
2182 * subsystem), by bd_claiming the device.
2184 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2187 struct block_device *bdev;
2188 char b[BDEVNAME_SIZE];
2190 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2191 shared ? (struct md_rdev *)lock_rdev : rdev);
2193 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2194 return PTR_ERR(bdev);
2200 static void unlock_rdev(struct md_rdev *rdev)
2202 struct block_device *bdev = rdev->bdev;
2204 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2207 void md_autodetect_dev(dev_t dev);
2209 static void export_rdev(struct md_rdev *rdev)
2211 char b[BDEVNAME_SIZE];
2213 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2214 md_rdev_clear(rdev);
2216 if (test_bit(AutoDetected, &rdev->flags))
2217 md_autodetect_dev(rdev->bdev->bd_dev);
2220 kobject_put(&rdev->kobj);
2223 void md_kick_rdev_from_array(struct md_rdev *rdev)
2225 unbind_rdev_from_array(rdev);
2228 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2230 static void export_array(struct mddev *mddev)
2232 struct md_rdev *rdev;
2234 while (!list_empty(&mddev->disks)) {
2235 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2237 md_kick_rdev_from_array(rdev);
2239 mddev->raid_disks = 0;
2240 mddev->major_version = 0;
2243 static void sync_sbs(struct mddev *mddev, int nospares)
2245 /* Update each superblock (in-memory image), but
2246 * if we are allowed to, skip spares which already
2247 * have the right event counter, or have one earlier
2248 * (which would mean they aren't being marked as dirty
2249 * with the rest of the array)
2251 struct md_rdev *rdev;
2252 rdev_for_each(rdev, mddev) {
2253 if (rdev->sb_events == mddev->events ||
2255 rdev->raid_disk < 0 &&
2256 rdev->sb_events+1 == mddev->events)) {
2257 /* Don't update this superblock */
2258 rdev->sb_loaded = 2;
2260 sync_super(mddev, rdev);
2261 rdev->sb_loaded = 1;
2266 static bool does_sb_need_changing(struct mddev *mddev)
2268 struct md_rdev *rdev;
2269 struct mdp_superblock_1 *sb;
2272 /* Find a good rdev */
2273 rdev_for_each(rdev, mddev)
2274 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2277 /* No good device found. */
2281 sb = page_address(rdev->sb_page);
2282 /* Check if a device has become faulty or a spare become active */
2283 rdev_for_each(rdev, mddev) {
2284 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2285 /* Device activated? */
2286 if (role == 0xffff && rdev->raid_disk >=0 &&
2287 !test_bit(Faulty, &rdev->flags))
2289 /* Device turned faulty? */
2290 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2294 /* Check if any mddev parameters have changed */
2295 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2296 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2297 (mddev->layout != le64_to_cpu(sb->layout)) ||
2298 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2299 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2305 void md_update_sb(struct mddev *mddev, int force_change)
2307 struct md_rdev *rdev;
2310 int any_badblocks_changed = 0;
2315 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2320 if (mddev_is_clustered(mddev)) {
2321 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2323 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2325 ret = md_cluster_ops->metadata_update_start(mddev);
2326 /* Has someone else has updated the sb */
2327 if (!does_sb_need_changing(mddev)) {
2329 md_cluster_ops->metadata_update_cancel(mddev);
2330 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2331 BIT(MD_SB_CHANGE_DEVS) |
2332 BIT(MD_SB_CHANGE_CLEAN));
2337 /* First make sure individual recovery_offsets are correct */
2338 rdev_for_each(rdev, mddev) {
2339 if (rdev->raid_disk >= 0 &&
2340 mddev->delta_disks >= 0 &&
2341 !test_bit(Journal, &rdev->flags) &&
2342 !test_bit(In_sync, &rdev->flags) &&
2343 mddev->curr_resync_completed > rdev->recovery_offset)
2344 rdev->recovery_offset = mddev->curr_resync_completed;
2347 if (!mddev->persistent) {
2348 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2349 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2350 if (!mddev->external) {
2351 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2352 rdev_for_each(rdev, mddev) {
2353 if (rdev->badblocks.changed) {
2354 rdev->badblocks.changed = 0;
2355 ack_all_badblocks(&rdev->badblocks);
2356 md_error(mddev, rdev);
2358 clear_bit(Blocked, &rdev->flags);
2359 clear_bit(BlockedBadBlocks, &rdev->flags);
2360 wake_up(&rdev->blocked_wait);
2363 wake_up(&mddev->sb_wait);
2367 spin_lock(&mddev->lock);
2369 mddev->utime = ktime_get_real_seconds();
2371 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2373 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2374 /* just a clean<-> dirty transition, possibly leave spares alone,
2375 * though if events isn't the right even/odd, we will have to do
2381 if (mddev->degraded)
2382 /* If the array is degraded, then skipping spares is both
2383 * dangerous and fairly pointless.
2384 * Dangerous because a device that was removed from the array
2385 * might have a event_count that still looks up-to-date,
2386 * so it can be re-added without a resync.
2387 * Pointless because if there are any spares to skip,
2388 * then a recovery will happen and soon that array won't
2389 * be degraded any more and the spare can go back to sleep then.
2393 sync_req = mddev->in_sync;
2395 /* If this is just a dirty<->clean transition, and the array is clean
2396 * and 'events' is odd, we can roll back to the previous clean state */
2398 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2399 && mddev->can_decrease_events
2400 && mddev->events != 1) {
2402 mddev->can_decrease_events = 0;
2404 /* otherwise we have to go forward and ... */
2406 mddev->can_decrease_events = nospares;
2410 * This 64-bit counter should never wrap.
2411 * Either we are in around ~1 trillion A.C., assuming
2412 * 1 reboot per second, or we have a bug...
2414 WARN_ON(mddev->events == 0);
2416 rdev_for_each(rdev, mddev) {
2417 if (rdev->badblocks.changed)
2418 any_badblocks_changed++;
2419 if (test_bit(Faulty, &rdev->flags))
2420 set_bit(FaultRecorded, &rdev->flags);
2423 sync_sbs(mddev, nospares);
2424 spin_unlock(&mddev->lock);
2426 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2427 mdname(mddev), mddev->in_sync);
2430 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2432 bitmap_update_sb(mddev->bitmap);
2433 rdev_for_each(rdev, mddev) {
2434 char b[BDEVNAME_SIZE];
2436 if (rdev->sb_loaded != 1)
2437 continue; /* no noise on spare devices */
2439 if (!test_bit(Faulty, &rdev->flags)) {
2440 md_super_write(mddev,rdev,
2441 rdev->sb_start, rdev->sb_size,
2443 pr_debug("md: (write) %s's sb offset: %llu\n",
2444 bdevname(rdev->bdev, b),
2445 (unsigned long long)rdev->sb_start);
2446 rdev->sb_events = mddev->events;
2447 if (rdev->badblocks.size) {
2448 md_super_write(mddev, rdev,
2449 rdev->badblocks.sector,
2450 rdev->badblocks.size << 9,
2452 rdev->badblocks.size = 0;
2456 pr_debug("md: %s (skipping faulty)\n",
2457 bdevname(rdev->bdev, b));
2459 if (mddev->level == LEVEL_MULTIPATH)
2460 /* only need to write one superblock... */
2463 if (md_super_wait(mddev) < 0)
2465 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2467 if (mddev_is_clustered(mddev) && ret == 0)
2468 md_cluster_ops->metadata_update_finish(mddev);
2470 if (mddev->in_sync != sync_req ||
2471 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2472 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2473 /* have to write it out again */
2475 wake_up(&mddev->sb_wait);
2476 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2477 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2479 rdev_for_each(rdev, mddev) {
2480 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2481 clear_bit(Blocked, &rdev->flags);
2483 if (any_badblocks_changed)
2484 ack_all_badblocks(&rdev->badblocks);
2485 clear_bit(BlockedBadBlocks, &rdev->flags);
2486 wake_up(&rdev->blocked_wait);
2489 EXPORT_SYMBOL(md_update_sb);
2491 static int add_bound_rdev(struct md_rdev *rdev)
2493 struct mddev *mddev = rdev->mddev;
2495 bool add_journal = test_bit(Journal, &rdev->flags);
2497 if (!mddev->pers->hot_remove_disk || add_journal) {
2498 /* If there is hot_add_disk but no hot_remove_disk
2499 * then added disks for geometry changes,
2500 * and should be added immediately.
2502 super_types[mddev->major_version].
2503 validate_super(mddev, rdev);
2505 mddev_suspend(mddev);
2506 err = mddev->pers->hot_add_disk(mddev, rdev);
2508 mddev_resume(mddev);
2510 md_kick_rdev_from_array(rdev);
2514 sysfs_notify_dirent_safe(rdev->sysfs_state);
2516 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2517 if (mddev->degraded)
2518 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2519 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2520 md_new_event(mddev);
2521 md_wakeup_thread(mddev->thread);
2525 /* words written to sysfs files may, or may not, be \n terminated.
2526 * We want to accept with case. For this we use cmd_match.
2528 static int cmd_match(const char *cmd, const char *str)
2530 /* See if cmd, written into a sysfs file, matches
2531 * str. They must either be the same, or cmd can
2532 * have a trailing newline
2534 while (*cmd && *str && *cmd == *str) {
2545 struct rdev_sysfs_entry {
2546 struct attribute attr;
2547 ssize_t (*show)(struct md_rdev *, char *);
2548 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2552 state_show(struct md_rdev *rdev, char *page)
2556 unsigned long flags = ACCESS_ONCE(rdev->flags);
2558 if (test_bit(Faulty, &flags) ||
2559 (!test_bit(ExternalBbl, &flags) &&
2560 rdev->badblocks.unacked_exist))
2561 len += sprintf(page+len, "faulty%s", sep);
2562 if (test_bit(In_sync, &flags))
2563 len += sprintf(page+len, "in_sync%s", sep);
2564 if (test_bit(Journal, &flags))
2565 len += sprintf(page+len, "journal%s", sep);
2566 if (test_bit(WriteMostly, &flags))
2567 len += sprintf(page+len, "write_mostly%s", sep);
2568 if (test_bit(Blocked, &flags) ||
2569 (rdev->badblocks.unacked_exist
2570 && !test_bit(Faulty, &flags)))
2571 len += sprintf(page+len, "blocked%s", sep);
2572 if (!test_bit(Faulty, &flags) &&
2573 !test_bit(Journal, &flags) &&
2574 !test_bit(In_sync, &flags))
2575 len += sprintf(page+len, "spare%s", sep);
2576 if (test_bit(WriteErrorSeen, &flags))
2577 len += sprintf(page+len, "write_error%s", sep);
2578 if (test_bit(WantReplacement, &flags))
2579 len += sprintf(page+len, "want_replacement%s", sep);
2580 if (test_bit(Replacement, &flags))
2581 len += sprintf(page+len, "replacement%s", sep);
2582 if (test_bit(ExternalBbl, &flags))
2583 len += sprintf(page+len, "external_bbl%s", sep);
2584 if (test_bit(FailFast, &flags))
2585 len += sprintf(page+len, "failfast%s", sep);
2590 return len+sprintf(page+len, "\n");
2594 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2597 * faulty - simulates an error
2598 * remove - disconnects the device
2599 * writemostly - sets write_mostly
2600 * -writemostly - clears write_mostly
2601 * blocked - sets the Blocked flags
2602 * -blocked - clears the Blocked and possibly simulates an error
2603 * insync - sets Insync providing device isn't active
2604 * -insync - clear Insync for a device with a slot assigned,
2605 * so that it gets rebuilt based on bitmap
2606 * write_error - sets WriteErrorSeen
2607 * -write_error - clears WriteErrorSeen
2608 * {,-}failfast - set/clear FailFast
2611 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2612 md_error(rdev->mddev, rdev);
2613 if (test_bit(Faulty, &rdev->flags))
2617 } else if (cmd_match(buf, "remove")) {
2618 if (rdev->mddev->pers) {
2619 clear_bit(Blocked, &rdev->flags);
2620 remove_and_add_spares(rdev->mddev, rdev);
2622 if (rdev->raid_disk >= 0)
2625 struct mddev *mddev = rdev->mddev;
2627 if (mddev_is_clustered(mddev))
2628 err = md_cluster_ops->remove_disk(mddev, rdev);
2631 md_kick_rdev_from_array(rdev);
2633 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2634 md_wakeup_thread(mddev->thread);
2636 md_new_event(mddev);
2639 } else if (cmd_match(buf, "writemostly")) {
2640 set_bit(WriteMostly, &rdev->flags);
2642 } else if (cmd_match(buf, "-writemostly")) {
2643 clear_bit(WriteMostly, &rdev->flags);
2645 } else if (cmd_match(buf, "blocked")) {
2646 set_bit(Blocked, &rdev->flags);
2648 } else if (cmd_match(buf, "-blocked")) {
2649 if (!test_bit(Faulty, &rdev->flags) &&
2650 !test_bit(ExternalBbl, &rdev->flags) &&
2651 rdev->badblocks.unacked_exist) {
2652 /* metadata handler doesn't understand badblocks,
2653 * so we need to fail the device
2655 md_error(rdev->mddev, rdev);
2657 clear_bit(Blocked, &rdev->flags);
2658 clear_bit(BlockedBadBlocks, &rdev->flags);
2659 wake_up(&rdev->blocked_wait);
2660 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2661 md_wakeup_thread(rdev->mddev->thread);
2664 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2665 set_bit(In_sync, &rdev->flags);
2667 } else if (cmd_match(buf, "failfast")) {
2668 set_bit(FailFast, &rdev->flags);
2670 } else if (cmd_match(buf, "-failfast")) {
2671 clear_bit(FailFast, &rdev->flags);
2673 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2674 !test_bit(Journal, &rdev->flags)) {
2675 if (rdev->mddev->pers == NULL) {
2676 clear_bit(In_sync, &rdev->flags);
2677 rdev->saved_raid_disk = rdev->raid_disk;
2678 rdev->raid_disk = -1;
2681 } else if (cmd_match(buf, "write_error")) {
2682 set_bit(WriteErrorSeen, &rdev->flags);
2684 } else if (cmd_match(buf, "-write_error")) {
2685 clear_bit(WriteErrorSeen, &rdev->flags);
2687 } else if (cmd_match(buf, "want_replacement")) {
2688 /* Any non-spare device that is not a replacement can
2689 * become want_replacement at any time, but we then need to
2690 * check if recovery is needed.
2692 if (rdev->raid_disk >= 0 &&
2693 !test_bit(Journal, &rdev->flags) &&
2694 !test_bit(Replacement, &rdev->flags))
2695 set_bit(WantReplacement, &rdev->flags);
2696 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2697 md_wakeup_thread(rdev->mddev->thread);
2699 } else if (cmd_match(buf, "-want_replacement")) {
2700 /* Clearing 'want_replacement' is always allowed.
2701 * Once replacements starts it is too late though.
2704 clear_bit(WantReplacement, &rdev->flags);
2705 } else if (cmd_match(buf, "replacement")) {
2706 /* Can only set a device as a replacement when array has not
2707 * yet been started. Once running, replacement is automatic
2708 * from spares, or by assigning 'slot'.
2710 if (rdev->mddev->pers)
2713 set_bit(Replacement, &rdev->flags);
2716 } else if (cmd_match(buf, "-replacement")) {
2717 /* Similarly, can only clear Replacement before start */
2718 if (rdev->mddev->pers)
2721 clear_bit(Replacement, &rdev->flags);
2724 } else if (cmd_match(buf, "re-add")) {
2725 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2726 /* clear_bit is performed _after_ all the devices
2727 * have their local Faulty bit cleared. If any writes
2728 * happen in the meantime in the local node, they
2729 * will land in the local bitmap, which will be synced
2730 * by this node eventually
2732 if (!mddev_is_clustered(rdev->mddev) ||
2733 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2734 clear_bit(Faulty, &rdev->flags);
2735 err = add_bound_rdev(rdev);
2739 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2740 set_bit(ExternalBbl, &rdev->flags);
2741 rdev->badblocks.shift = 0;
2743 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2744 clear_bit(ExternalBbl, &rdev->flags);
2748 sysfs_notify_dirent_safe(rdev->sysfs_state);
2749 return err ? err : len;
2751 static struct rdev_sysfs_entry rdev_state =
2752 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2755 errors_show(struct md_rdev *rdev, char *page)
2757 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2761 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2766 rv = kstrtouint(buf, 10, &n);
2769 atomic_set(&rdev->corrected_errors, n);
2772 static struct rdev_sysfs_entry rdev_errors =
2773 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2776 slot_show(struct md_rdev *rdev, char *page)
2778 if (test_bit(Journal, &rdev->flags))
2779 return sprintf(page, "journal\n");
2780 else if (rdev->raid_disk < 0)
2781 return sprintf(page, "none\n");
2783 return sprintf(page, "%d\n", rdev->raid_disk);
2787 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2792 if (test_bit(Journal, &rdev->flags))
2794 if (strncmp(buf, "none", 4)==0)
2797 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2801 if (rdev->mddev->pers && slot == -1) {
2802 /* Setting 'slot' on an active array requires also
2803 * updating the 'rd%d' link, and communicating
2804 * with the personality with ->hot_*_disk.
2805 * For now we only support removing
2806 * failed/spare devices. This normally happens automatically,
2807 * but not when the metadata is externally managed.
2809 if (rdev->raid_disk == -1)
2811 /* personality does all needed checks */
2812 if (rdev->mddev->pers->hot_remove_disk == NULL)
2814 clear_bit(Blocked, &rdev->flags);
2815 remove_and_add_spares(rdev->mddev, rdev);
2816 if (rdev->raid_disk >= 0)
2818 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2819 md_wakeup_thread(rdev->mddev->thread);
2820 } else if (rdev->mddev->pers) {
2821 /* Activating a spare .. or possibly reactivating
2822 * if we ever get bitmaps working here.
2826 if (rdev->raid_disk != -1)
2829 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2832 if (rdev->mddev->pers->hot_add_disk == NULL)
2835 if (slot >= rdev->mddev->raid_disks &&
2836 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2839 rdev->raid_disk = slot;
2840 if (test_bit(In_sync, &rdev->flags))
2841 rdev->saved_raid_disk = slot;
2843 rdev->saved_raid_disk = -1;
2844 clear_bit(In_sync, &rdev->flags);
2845 clear_bit(Bitmap_sync, &rdev->flags);
2846 err = rdev->mddev->pers->
2847 hot_add_disk(rdev->mddev, rdev);
2849 rdev->raid_disk = -1;
2852 sysfs_notify_dirent_safe(rdev->sysfs_state);
2853 if (sysfs_link_rdev(rdev->mddev, rdev))
2854 /* failure here is OK */;
2855 /* don't wakeup anyone, leave that to userspace. */
2857 if (slot >= rdev->mddev->raid_disks &&
2858 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2860 rdev->raid_disk = slot;
2861 /* assume it is working */
2862 clear_bit(Faulty, &rdev->flags);
2863 clear_bit(WriteMostly, &rdev->flags);
2864 set_bit(In_sync, &rdev->flags);
2865 sysfs_notify_dirent_safe(rdev->sysfs_state);
2870 static struct rdev_sysfs_entry rdev_slot =
2871 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2874 offset_show(struct md_rdev *rdev, char *page)
2876 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2880 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2882 unsigned long long offset;
2883 if (kstrtoull(buf, 10, &offset) < 0)
2885 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2887 if (rdev->sectors && rdev->mddev->external)
2888 /* Must set offset before size, so overlap checks
2891 rdev->data_offset = offset;
2892 rdev->new_data_offset = offset;
2896 static struct rdev_sysfs_entry rdev_offset =
2897 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2899 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2901 return sprintf(page, "%llu\n",
2902 (unsigned long long)rdev->new_data_offset);
2905 static ssize_t new_offset_store(struct md_rdev *rdev,
2906 const char *buf, size_t len)
2908 unsigned long long new_offset;
2909 struct mddev *mddev = rdev->mddev;
2911 if (kstrtoull(buf, 10, &new_offset) < 0)
2914 if (mddev->sync_thread ||
2915 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2917 if (new_offset == rdev->data_offset)
2918 /* reset is always permitted */
2920 else if (new_offset > rdev->data_offset) {
2921 /* must not push array size beyond rdev_sectors */
2922 if (new_offset - rdev->data_offset
2923 + mddev->dev_sectors > rdev->sectors)
2926 /* Metadata worries about other space details. */
2928 /* decreasing the offset is inconsistent with a backwards
2931 if (new_offset < rdev->data_offset &&
2932 mddev->reshape_backwards)
2934 /* Increasing offset is inconsistent with forwards
2935 * reshape. reshape_direction should be set to
2936 * 'backwards' first.
2938 if (new_offset > rdev->data_offset &&
2939 !mddev->reshape_backwards)
2942 if (mddev->pers && mddev->persistent &&
2943 !super_types[mddev->major_version]
2944 .allow_new_offset(rdev, new_offset))
2946 rdev->new_data_offset = new_offset;
2947 if (new_offset > rdev->data_offset)
2948 mddev->reshape_backwards = 1;
2949 else if (new_offset < rdev->data_offset)
2950 mddev->reshape_backwards = 0;
2954 static struct rdev_sysfs_entry rdev_new_offset =
2955 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2958 rdev_size_show(struct md_rdev *rdev, char *page)
2960 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2963 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2965 /* check if two start/length pairs overlap */
2973 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2975 unsigned long long blocks;
2978 if (kstrtoull(buf, 10, &blocks) < 0)
2981 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2982 return -EINVAL; /* sector conversion overflow */
2985 if (new != blocks * 2)
2986 return -EINVAL; /* unsigned long long to sector_t overflow */
2993 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2995 struct mddev *my_mddev = rdev->mddev;
2996 sector_t oldsectors = rdev->sectors;
2999 if (test_bit(Journal, &rdev->flags))
3001 if (strict_blocks_to_sectors(buf, §ors) < 0)
3003 if (rdev->data_offset != rdev->new_data_offset)
3004 return -EINVAL; /* too confusing */
3005 if (my_mddev->pers && rdev->raid_disk >= 0) {
3006 if (my_mddev->persistent) {
3007 sectors = super_types[my_mddev->major_version].
3008 rdev_size_change(rdev, sectors);
3011 } else if (!sectors)
3012 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3014 if (!my_mddev->pers->resize)
3015 /* Cannot change size for RAID0 or Linear etc */
3018 if (sectors < my_mddev->dev_sectors)
3019 return -EINVAL; /* component must fit device */
3021 rdev->sectors = sectors;
3022 if (sectors > oldsectors && my_mddev->external) {
3023 /* Need to check that all other rdevs with the same
3024 * ->bdev do not overlap. 'rcu' is sufficient to walk
3025 * the rdev lists safely.
3026 * This check does not provide a hard guarantee, it
3027 * just helps avoid dangerous mistakes.
3029 struct mddev *mddev;
3031 struct list_head *tmp;
3034 for_each_mddev(mddev, tmp) {
3035 struct md_rdev *rdev2;
3037 rdev_for_each(rdev2, mddev)
3038 if (rdev->bdev == rdev2->bdev &&
3040 overlaps(rdev->data_offset, rdev->sectors,
3053 /* Someone else could have slipped in a size
3054 * change here, but doing so is just silly.
3055 * We put oldsectors back because we *know* it is
3056 * safe, and trust userspace not to race with
3059 rdev->sectors = oldsectors;
3066 static struct rdev_sysfs_entry rdev_size =
3067 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3069 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3071 unsigned long long recovery_start = rdev->recovery_offset;
3073 if (test_bit(In_sync, &rdev->flags) ||
3074 recovery_start == MaxSector)
3075 return sprintf(page, "none\n");
3077 return sprintf(page, "%llu\n", recovery_start);
3080 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3082 unsigned long long recovery_start;
3084 if (cmd_match(buf, "none"))
3085 recovery_start = MaxSector;
3086 else if (kstrtoull(buf, 10, &recovery_start))
3089 if (rdev->mddev->pers &&
3090 rdev->raid_disk >= 0)
3093 rdev->recovery_offset = recovery_start;
3094 if (recovery_start == MaxSector)
3095 set_bit(In_sync, &rdev->flags);
3097 clear_bit(In_sync, &rdev->flags);
3101 static struct rdev_sysfs_entry rdev_recovery_start =
3102 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3104 /* sysfs access to bad-blocks list.
3105 * We present two files.
3106 * 'bad-blocks' lists sector numbers and lengths of ranges that
3107 * are recorded as bad. The list is truncated to fit within
3108 * the one-page limit of sysfs.
3109 * Writing "sector length" to this file adds an acknowledged
3111 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3112 * been acknowledged. Writing to this file adds bad blocks
3113 * without acknowledging them. This is largely for testing.
3115 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3117 return badblocks_show(&rdev->badblocks, page, 0);
3119 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3121 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3122 /* Maybe that ack was all we needed */
3123 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3124 wake_up(&rdev->blocked_wait);
3127 static struct rdev_sysfs_entry rdev_bad_blocks =
3128 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3130 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3132 return badblocks_show(&rdev->badblocks, page, 1);
3134 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3136 return badblocks_store(&rdev->badblocks, page, len, 1);
3138 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3139 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3141 static struct attribute *rdev_default_attrs[] = {
3146 &rdev_new_offset.attr,
3148 &rdev_recovery_start.attr,
3149 &rdev_bad_blocks.attr,
3150 &rdev_unack_bad_blocks.attr,
3154 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3156 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3157 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3163 return entry->show(rdev, page);
3167 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3168 const char *page, size_t length)
3170 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3171 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3173 struct mddev *mddev = rdev->mddev;
3177 if (!capable(CAP_SYS_ADMIN))
3179 rv = mddev ? mddev_lock(mddev): -EBUSY;
3181 if (rdev->mddev == NULL)
3184 rv = entry->store(rdev, page, length);
3185 mddev_unlock(mddev);
3190 static void rdev_free(struct kobject *ko)
3192 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3195 static const struct sysfs_ops rdev_sysfs_ops = {
3196 .show = rdev_attr_show,
3197 .store = rdev_attr_store,
3199 static struct kobj_type rdev_ktype = {
3200 .release = rdev_free,
3201 .sysfs_ops = &rdev_sysfs_ops,
3202 .default_attrs = rdev_default_attrs,
3205 int md_rdev_init(struct md_rdev *rdev)
3208 rdev->saved_raid_disk = -1;
3209 rdev->raid_disk = -1;
3211 rdev->data_offset = 0;
3212 rdev->new_data_offset = 0;
3213 rdev->sb_events = 0;
3214 rdev->last_read_error = 0;
3215 rdev->sb_loaded = 0;
3216 rdev->bb_page = NULL;
3217 atomic_set(&rdev->nr_pending, 0);
3218 atomic_set(&rdev->read_errors, 0);
3219 atomic_set(&rdev->corrected_errors, 0);
3221 INIT_LIST_HEAD(&rdev->same_set);
3222 init_waitqueue_head(&rdev->blocked_wait);
3224 /* Add space to store bad block list.
3225 * This reserves the space even on arrays where it cannot
3226 * be used - I wonder if that matters
3228 return badblocks_init(&rdev->badblocks, 0);
3230 EXPORT_SYMBOL_GPL(md_rdev_init);
3232 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3234 * mark the device faulty if:
3236 * - the device is nonexistent (zero size)
3237 * - the device has no valid superblock
3239 * a faulty rdev _never_ has rdev->sb set.
3241 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3243 char b[BDEVNAME_SIZE];
3245 struct md_rdev *rdev;
3248 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3250 return ERR_PTR(-ENOMEM);
3252 err = md_rdev_init(rdev);
3255 err = alloc_disk_sb(rdev);
3259 err = lock_rdev(rdev, newdev, super_format == -2);
3263 kobject_init(&rdev->kobj, &rdev_ktype);
3265 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3267 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3268 bdevname(rdev->bdev,b));
3273 if (super_format >= 0) {
3274 err = super_types[super_format].
3275 load_super(rdev, NULL, super_minor);
3276 if (err == -EINVAL) {
3277 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3278 bdevname(rdev->bdev,b),
3279 super_format, super_minor);
3283 pr_warn("md: could not read %s's sb, not importing!\n",
3284 bdevname(rdev->bdev,b));
3294 md_rdev_clear(rdev);
3296 return ERR_PTR(err);
3300 * Check a full RAID array for plausibility
3303 static void analyze_sbs(struct mddev *mddev)
3306 struct md_rdev *rdev, *freshest, *tmp;
3307 char b[BDEVNAME_SIZE];
3310 rdev_for_each_safe(rdev, tmp, mddev)
3311 switch (super_types[mddev->major_version].
3312 load_super(rdev, freshest, mddev->minor_version)) {
3319 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3320 bdevname(rdev->bdev,b));
3321 md_kick_rdev_from_array(rdev);
3324 super_types[mddev->major_version].
3325 validate_super(mddev, freshest);
3328 rdev_for_each_safe(rdev, tmp, mddev) {
3329 if (mddev->max_disks &&
3330 (rdev->desc_nr >= mddev->max_disks ||
3331 i > mddev->max_disks)) {
3332 pr_warn("md: %s: %s: only %d devices permitted\n",
3333 mdname(mddev), bdevname(rdev->bdev, b),
3335 md_kick_rdev_from_array(rdev);
3338 if (rdev != freshest) {
3339 if (super_types[mddev->major_version].
3340 validate_super(mddev, rdev)) {
3341 pr_warn("md: kicking non-fresh %s from array!\n",
3342 bdevname(rdev->bdev,b));
3343 md_kick_rdev_from_array(rdev);
3347 if (mddev->level == LEVEL_MULTIPATH) {
3348 rdev->desc_nr = i++;
3349 rdev->raid_disk = rdev->desc_nr;
3350 set_bit(In_sync, &rdev->flags);
3351 } else if (rdev->raid_disk >=
3352 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3353 !test_bit(Journal, &rdev->flags)) {
3354 rdev->raid_disk = -1;
3355 clear_bit(In_sync, &rdev->flags);
3360 /* Read a fixed-point number.
3361 * Numbers in sysfs attributes should be in "standard" units where
3362 * possible, so time should be in seconds.
3363 * However we internally use a a much smaller unit such as
3364 * milliseconds or jiffies.
3365 * This function takes a decimal number with a possible fractional
3366 * component, and produces an integer which is the result of
3367 * multiplying that number by 10^'scale'.
3368 * all without any floating-point arithmetic.
3370 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3372 unsigned long result = 0;
3374 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3377 else if (decimals < scale) {
3380 result = result * 10 + value;
3392 while (decimals < scale) {
3401 safe_delay_show(struct mddev *mddev, char *page)
3403 int msec = (mddev->safemode_delay*1000)/HZ;
3404 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3407 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3411 if (mddev_is_clustered(mddev)) {
3412 pr_warn("md: Safemode is disabled for clustered mode\n");
3416 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3419 mddev->safemode_delay = 0;
3421 unsigned long old_delay = mddev->safemode_delay;
3422 unsigned long new_delay = (msec*HZ)/1000;
3426 mddev->safemode_delay = new_delay;
3427 if (new_delay < old_delay || old_delay == 0)
3428 mod_timer(&mddev->safemode_timer, jiffies+1);
3432 static struct md_sysfs_entry md_safe_delay =
3433 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3436 level_show(struct mddev *mddev, char *page)
3438 struct md_personality *p;
3440 spin_lock(&mddev->lock);
3443 ret = sprintf(page, "%s\n", p->name);
3444 else if (mddev->clevel[0])
3445 ret = sprintf(page, "%s\n", mddev->clevel);
3446 else if (mddev->level != LEVEL_NONE)
3447 ret = sprintf(page, "%d\n", mddev->level);
3450 spin_unlock(&mddev->lock);
3455 level_store(struct mddev *mddev, const char *buf, size_t len)
3460 struct md_personality *pers, *oldpers;
3462 void *priv, *oldpriv;
3463 struct md_rdev *rdev;
3465 if (slen == 0 || slen >= sizeof(clevel))
3468 rv = mddev_lock(mddev);
3472 if (mddev->pers == NULL) {
3473 strncpy(mddev->clevel, buf, slen);
3474 if (mddev->clevel[slen-1] == '\n')
3476 mddev->clevel[slen] = 0;
3477 mddev->level = LEVEL_NONE;
3485 /* request to change the personality. Need to ensure:
3486 * - array is not engaged in resync/recovery/reshape
3487 * - old personality can be suspended
3488 * - new personality will access other array.
3492 if (mddev->sync_thread ||
3493 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3494 mddev->reshape_position != MaxSector ||
3495 mddev->sysfs_active)
3499 if (!mddev->pers->quiesce) {
3500 pr_warn("md: %s: %s does not support online personality change\n",
3501 mdname(mddev), mddev->pers->name);
3505 /* Now find the new personality */
3506 strncpy(clevel, buf, slen);
3507 if (clevel[slen-1] == '\n')
3510 if (kstrtol(clevel, 10, &level))
3513 if (request_module("md-%s", clevel) != 0)
3514 request_module("md-level-%s", clevel);
3515 spin_lock(&pers_lock);
3516 pers = find_pers(level, clevel);
3517 if (!pers || !try_module_get(pers->owner)) {
3518 spin_unlock(&pers_lock);
3519 pr_warn("md: personality %s not loaded\n", clevel);
3523 spin_unlock(&pers_lock);
3525 if (pers == mddev->pers) {
3526 /* Nothing to do! */
3527 module_put(pers->owner);
3531 if (!pers->takeover) {
3532 module_put(pers->owner);
3533 pr_warn("md: %s: %s does not support personality takeover\n",
3534 mdname(mddev), clevel);
3539 rdev_for_each(rdev, mddev)
3540 rdev->new_raid_disk = rdev->raid_disk;
3542 /* ->takeover must set new_* and/or delta_disks
3543 * if it succeeds, and may set them when it fails.
3545 priv = pers->takeover(mddev);
3547 mddev->new_level = mddev->level;
3548 mddev->new_layout = mddev->layout;
3549 mddev->new_chunk_sectors = mddev->chunk_sectors;
3550 mddev->raid_disks -= mddev->delta_disks;
3551 mddev->delta_disks = 0;
3552 mddev->reshape_backwards = 0;
3553 module_put(pers->owner);
3554 pr_warn("md: %s: %s would not accept array\n",
3555 mdname(mddev), clevel);
3560 /* Looks like we have a winner */
3561 mddev_suspend(mddev);
3562 mddev_detach(mddev);
3564 spin_lock(&mddev->lock);
3565 oldpers = mddev->pers;
3566 oldpriv = mddev->private;
3568 mddev->private = priv;
3569 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3570 mddev->level = mddev->new_level;
3571 mddev->layout = mddev->new_layout;
3572 mddev->chunk_sectors = mddev->new_chunk_sectors;
3573 mddev->delta_disks = 0;
3574 mddev->reshape_backwards = 0;
3575 mddev->degraded = 0;
3576 spin_unlock(&mddev->lock);
3578 if (oldpers->sync_request == NULL &&
3580 /* We are converting from a no-redundancy array
3581 * to a redundancy array and metadata is managed
3582 * externally so we need to be sure that writes
3583 * won't block due to a need to transition
3585 * until external management is started.
3588 mddev->safemode_delay = 0;
3589 mddev->safemode = 0;
3592 oldpers->free(mddev, oldpriv);
3594 if (oldpers->sync_request == NULL &&
3595 pers->sync_request != NULL) {
3596 /* need to add the md_redundancy_group */
3597 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3598 pr_warn("md: cannot register extra attributes for %s\n",
3600 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3602 if (oldpers->sync_request != NULL &&
3603 pers->sync_request == NULL) {
3604 /* need to remove the md_redundancy_group */
3605 if (mddev->to_remove == NULL)
3606 mddev->to_remove = &md_redundancy_group;
3609 module_put(oldpers->owner);
3611 rdev_for_each(rdev, mddev) {
3612 if (rdev->raid_disk < 0)
3614 if (rdev->new_raid_disk >= mddev->raid_disks)
3615 rdev->new_raid_disk = -1;
3616 if (rdev->new_raid_disk == rdev->raid_disk)
3618 sysfs_unlink_rdev(mddev, rdev);
3620 rdev_for_each(rdev, mddev) {
3621 if (rdev->raid_disk < 0)
3623 if (rdev->new_raid_disk == rdev->raid_disk)
3625 rdev->raid_disk = rdev->new_raid_disk;
3626 if (rdev->raid_disk < 0)
3627 clear_bit(In_sync, &rdev->flags);
3629 if (sysfs_link_rdev(mddev, rdev))
3630 pr_warn("md: cannot register rd%d for %s after level change\n",
3631 rdev->raid_disk, mdname(mddev));
3635 if (pers->sync_request == NULL) {
3636 /* this is now an array without redundancy, so
3637 * it must always be in_sync
3640 del_timer_sync(&mddev->safemode_timer);
3642 blk_set_stacking_limits(&mddev->queue->limits);
3644 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3645 mddev_resume(mddev);
3647 md_update_sb(mddev, 1);
3648 sysfs_notify(&mddev->kobj, NULL, "level");
3649 md_new_event(mddev);
3652 mddev_unlock(mddev);
3656 static struct md_sysfs_entry md_level =
3657 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3660 layout_show(struct mddev *mddev, char *page)
3662 /* just a number, not meaningful for all levels */
3663 if (mddev->reshape_position != MaxSector &&
3664 mddev->layout != mddev->new_layout)
3665 return sprintf(page, "%d (%d)\n",
3666 mddev->new_layout, mddev->layout);
3667 return sprintf(page, "%d\n", mddev->layout);
3671 layout_store(struct mddev *mddev, const char *buf, size_t len)
3676 err = kstrtouint(buf, 10, &n);
3679 err = mddev_lock(mddev);
3684 if (mddev->pers->check_reshape == NULL)
3689 mddev->new_layout = n;
3690 err = mddev->pers->check_reshape(mddev);
3692 mddev->new_layout = mddev->layout;
3695 mddev->new_layout = n;
3696 if (mddev->reshape_position == MaxSector)
3699 mddev_unlock(mddev);
3702 static struct md_sysfs_entry md_layout =
3703 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3706 raid_disks_show(struct mddev *mddev, char *page)
3708 if (mddev->raid_disks == 0)
3710 if (mddev->reshape_position != MaxSector &&
3711 mddev->delta_disks != 0)
3712 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3713 mddev->raid_disks - mddev->delta_disks);
3714 return sprintf(page, "%d\n", mddev->raid_disks);
3717 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3720 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3725 err = kstrtouint(buf, 10, &n);
3729 err = mddev_lock(mddev);
3733 err = update_raid_disks(mddev, n);
3734 else if (mddev->reshape_position != MaxSector) {
3735 struct md_rdev *rdev;
3736 int olddisks = mddev->raid_disks - mddev->delta_disks;
3739 rdev_for_each(rdev, mddev) {
3741 rdev->data_offset < rdev->new_data_offset)
3744 rdev->data_offset > rdev->new_data_offset)
3748 mddev->delta_disks = n - olddisks;
3749 mddev->raid_disks = n;
3750 mddev->reshape_backwards = (mddev->delta_disks < 0);
3752 mddev->raid_disks = n;
3754 mddev_unlock(mddev);
3755 return err ? err : len;
3757 static struct md_sysfs_entry md_raid_disks =
3758 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3761 chunk_size_show(struct mddev *mddev, char *page)
3763 if (mddev->reshape_position != MaxSector &&
3764 mddev->chunk_sectors != mddev->new_chunk_sectors)
3765 return sprintf(page, "%d (%d)\n",
3766 mddev->new_chunk_sectors << 9,
3767 mddev->chunk_sectors << 9);
3768 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3772 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3777 err = kstrtoul(buf, 10, &n);
3781 err = mddev_lock(mddev);
3785 if (mddev->pers->check_reshape == NULL)
3790 mddev->new_chunk_sectors = n >> 9;
3791 err = mddev->pers->check_reshape(mddev);
3793 mddev->new_chunk_sectors = mddev->chunk_sectors;
3796 mddev->new_chunk_sectors = n >> 9;
3797 if (mddev->reshape_position == MaxSector)
3798 mddev->chunk_sectors = n >> 9;
3800 mddev_unlock(mddev);
3803 static struct md_sysfs_entry md_chunk_size =
3804 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3807 resync_start_show(struct mddev *mddev, char *page)
3809 if (mddev->recovery_cp == MaxSector)
3810 return sprintf(page, "none\n");
3811 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3815 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3817 unsigned long long n;
3820 if (cmd_match(buf, "none"))
3823 err = kstrtoull(buf, 10, &n);
3826 if (n != (sector_t)n)
3830 err = mddev_lock(mddev);
3833 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3837 mddev->recovery_cp = n;
3839 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
3841 mddev_unlock(mddev);
3844 static struct md_sysfs_entry md_resync_start =
3845 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3846 resync_start_show, resync_start_store);
3849 * The array state can be:
3852 * No devices, no size, no level
3853 * Equivalent to STOP_ARRAY ioctl
3855 * May have some settings, but array is not active
3856 * all IO results in error
3857 * When written, doesn't tear down array, but just stops it
3858 * suspended (not supported yet)
3859 * All IO requests will block. The array can be reconfigured.
3860 * Writing this, if accepted, will block until array is quiescent
3862 * no resync can happen. no superblocks get written.
3863 * write requests fail
3865 * like readonly, but behaves like 'clean' on a write request.
3867 * clean - no pending writes, but otherwise active.
3868 * When written to inactive array, starts without resync
3869 * If a write request arrives then
3870 * if metadata is known, mark 'dirty' and switch to 'active'.
3871 * if not known, block and switch to write-pending
3872 * If written to an active array that has pending writes, then fails.
3874 * fully active: IO and resync can be happening.
3875 * When written to inactive array, starts with resync
3878 * clean, but writes are blocked waiting for 'active' to be written.
3881 * like active, but no writes have been seen for a while (100msec).
3884 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3885 write_pending, active_idle, bad_word};
3886 static char *array_states[] = {
3887 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3888 "write-pending", "active-idle", NULL };
3890 static int match_word(const char *word, char **list)
3893 for (n=0; list[n]; n++)
3894 if (cmd_match(word, list[n]))
3900 array_state_show(struct mddev *mddev, char *page)
3902 enum array_state st = inactive;
3913 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
3915 else if (mddev->in_sync)
3917 else if (mddev->safemode)
3923 if (list_empty(&mddev->disks) &&
3924 mddev->raid_disks == 0 &&
3925 mddev->dev_sectors == 0)
3930 return sprintf(page, "%s\n", array_states[st]);
3933 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3934 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3935 static int do_md_run(struct mddev *mddev);
3936 static int restart_array(struct mddev *mddev);
3939 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3942 enum array_state st = match_word(buf, array_states);
3944 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3945 /* don't take reconfig_mutex when toggling between
3948 spin_lock(&mddev->lock);
3950 restart_array(mddev);
3951 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
3952 md_wakeup_thread(mddev->thread);
3953 wake_up(&mddev->sb_wait);
3955 } else /* st == clean */ {
3956 restart_array(mddev);
3957 if (atomic_read(&mddev->writes_pending) == 0) {
3958 if (mddev->in_sync == 0) {
3960 if (mddev->safemode == 1)
3961 mddev->safemode = 0;
3962 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
3969 sysfs_notify_dirent_safe(mddev->sysfs_state);
3970 spin_unlock(&mddev->lock);
3973 err = mddev_lock(mddev);
3981 /* stopping an active array */
3982 err = do_md_stop(mddev, 0, NULL);
3985 /* stopping an active array */
3987 err = do_md_stop(mddev, 2, NULL);
3989 err = 0; /* already inactive */
3992 break; /* not supported yet */
3995 err = md_set_readonly(mddev, NULL);
3998 set_disk_ro(mddev->gendisk, 1);
3999 err = do_md_run(mddev);
4005 err = md_set_readonly(mddev, NULL);
4006 else if (mddev->ro == 1)
4007 err = restart_array(mddev);
4010 set_disk_ro(mddev->gendisk, 0);
4014 err = do_md_run(mddev);
4019 err = restart_array(mddev);
4022 spin_lock(&mddev->lock);
4023 if (atomic_read(&mddev->writes_pending) == 0) {
4024 if (mddev->in_sync == 0) {
4026 if (mddev->safemode == 1)
4027 mddev->safemode = 0;
4028 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4033 spin_unlock(&mddev->lock);
4039 err = restart_array(mddev);
4042 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4043 wake_up(&mddev->sb_wait);
4047 set_disk_ro(mddev->gendisk, 0);
4048 err = do_md_run(mddev);
4053 /* these cannot be set */
4058 if (mddev->hold_active == UNTIL_IOCTL)
4059 mddev->hold_active = 0;
4060 sysfs_notify_dirent_safe(mddev->sysfs_state);
4062 mddev_unlock(mddev);
4065 static struct md_sysfs_entry md_array_state =
4066 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4069 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4070 return sprintf(page, "%d\n",
4071 atomic_read(&mddev->max_corr_read_errors));
4075 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4080 rv = kstrtouint(buf, 10, &n);
4083 atomic_set(&mddev->max_corr_read_errors, n);
4087 static struct md_sysfs_entry max_corr_read_errors =
4088 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4089 max_corrected_read_errors_store);
4092 null_show(struct mddev *mddev, char *page)
4098 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4100 /* buf must be %d:%d\n? giving major and minor numbers */
4101 /* The new device is added to the array.
4102 * If the array has a persistent superblock, we read the
4103 * superblock to initialise info and check validity.
4104 * Otherwise, only checking done is that in bind_rdev_to_array,
4105 * which mainly checks size.
4108 int major = simple_strtoul(buf, &e, 10);
4111 struct md_rdev *rdev;
4114 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4116 minor = simple_strtoul(e+1, &e, 10);
4117 if (*e && *e != '\n')
4119 dev = MKDEV(major, minor);
4120 if (major != MAJOR(dev) ||
4121 minor != MINOR(dev))
4124 flush_workqueue(md_misc_wq);
4126 err = mddev_lock(mddev);
4129 if (mddev->persistent) {
4130 rdev = md_import_device(dev, mddev->major_version,
4131 mddev->minor_version);
4132 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4133 struct md_rdev *rdev0
4134 = list_entry(mddev->disks.next,
4135 struct md_rdev, same_set);
4136 err = super_types[mddev->major_version]
4137 .load_super(rdev, rdev0, mddev->minor_version);
4141 } else if (mddev->external)
4142 rdev = md_import_device(dev, -2, -1);
4144 rdev = md_import_device(dev, -1, -1);
4147 mddev_unlock(mddev);
4148 return PTR_ERR(rdev);
4150 err = bind_rdev_to_array(rdev, mddev);
4154 mddev_unlock(mddev);
4155 return err ? err : len;
4158 static struct md_sysfs_entry md_new_device =
4159 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4162 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4165 unsigned long chunk, end_chunk;
4168 err = mddev_lock(mddev);
4173 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4175 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4176 if (buf == end) break;
4177 if (*end == '-') { /* range */
4179 end_chunk = simple_strtoul(buf, &end, 0);
4180 if (buf == end) break;
4182 if (*end && !isspace(*end)) break;
4183 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4184 buf = skip_spaces(end);
4186 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4188 mddev_unlock(mddev);
4192 static struct md_sysfs_entry md_bitmap =
4193 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4196 size_show(struct mddev *mddev, char *page)
4198 return sprintf(page, "%llu\n",
4199 (unsigned long long)mddev->dev_sectors / 2);
4202 static int update_size(struct mddev *mddev, sector_t num_sectors);
4205 size_store(struct mddev *mddev, const char *buf, size_t len)
4207 /* If array is inactive, we can reduce the component size, but
4208 * not increase it (except from 0).
4209 * If array is active, we can try an on-line resize
4212 int err = strict_blocks_to_sectors(buf, §ors);
4216 err = mddev_lock(mddev);
4220 err = update_size(mddev, sectors);
4222 md_update_sb(mddev, 1);
4224 if (mddev->dev_sectors == 0 ||
4225 mddev->dev_sectors > sectors)
4226 mddev->dev_sectors = sectors;
4230 mddev_unlock(mddev);
4231 return err ? err : len;
4234 static struct md_sysfs_entry md_size =
4235 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4237 /* Metadata version.
4239 * 'none' for arrays with no metadata (good luck...)
4240 * 'external' for arrays with externally managed metadata,
4241 * or N.M for internally known formats
4244 metadata_show(struct mddev *mddev, char *page)
4246 if (mddev->persistent)
4247 return sprintf(page, "%d.%d\n",
4248 mddev->major_version, mddev->minor_version);
4249 else if (mddev->external)
4250 return sprintf(page, "external:%s\n", mddev->metadata_type);
4252 return sprintf(page, "none\n");
4256 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4261 /* Changing the details of 'external' metadata is
4262 * always permitted. Otherwise there must be
4263 * no devices attached to the array.
4266 err = mddev_lock(mddev);
4270 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4272 else if (!list_empty(&mddev->disks))
4276 if (cmd_match(buf, "none")) {
4277 mddev->persistent = 0;
4278 mddev->external = 0;
4279 mddev->major_version = 0;
4280 mddev->minor_version = 90;
4283 if (strncmp(buf, "external:", 9) == 0) {
4284 size_t namelen = len-9;
4285 if (namelen >= sizeof(mddev->metadata_type))
4286 namelen = sizeof(mddev->metadata_type)-1;
4287 strncpy(mddev->metadata_type, buf+9, namelen);
4288 mddev->metadata_type[namelen] = 0;
4289 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4290 mddev->metadata_type[--namelen] = 0;
4291 mddev->persistent = 0;
4292 mddev->external = 1;
4293 mddev->major_version = 0;
4294 mddev->minor_version = 90;
4297 major = simple_strtoul(buf, &e, 10);
4299 if (e==buf || *e != '.')
4302 minor = simple_strtoul(buf, &e, 10);
4303 if (e==buf || (*e && *e != '\n') )
4306 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4308 mddev->major_version = major;
4309 mddev->minor_version = minor;
4310 mddev->persistent = 1;
4311 mddev->external = 0;
4314 mddev_unlock(mddev);
4318 static struct md_sysfs_entry md_metadata =
4319 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4322 action_show(struct mddev *mddev, char *page)
4324 char *type = "idle";
4325 unsigned long recovery = mddev->recovery;
4326 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4328 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4329 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4330 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4332 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4333 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4335 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4339 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4341 else if (mddev->reshape_position != MaxSector)
4344 return sprintf(page, "%s\n", type);
4348 action_store(struct mddev *mddev, const char *page, size_t len)
4350 if (!mddev->pers || !mddev->pers->sync_request)
4354 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4355 if (cmd_match(page, "frozen"))
4356 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4358 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4359 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4360 mddev_lock(mddev) == 0) {
4361 flush_workqueue(md_misc_wq);
4362 if (mddev->sync_thread) {
4363 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4364 md_reap_sync_thread(mddev);
4366 mddev_unlock(mddev);
4368 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4370 else if (cmd_match(page, "resync"))
4371 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4372 else if (cmd_match(page, "recover")) {
4373 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4374 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4375 } else if (cmd_match(page, "reshape")) {
4377 if (mddev->pers->start_reshape == NULL)
4379 err = mddev_lock(mddev);
4381 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4384 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4385 err = mddev->pers->start_reshape(mddev);
4387 mddev_unlock(mddev);
4391 sysfs_notify(&mddev->kobj, NULL, "degraded");
4393 if (cmd_match(page, "check"))
4394 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4395 else if (!cmd_match(page, "repair"))
4397 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4398 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4399 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4401 if (mddev->ro == 2) {
4402 /* A write to sync_action is enough to justify
4403 * canceling read-auto mode
4406 md_wakeup_thread(mddev->sync_thread);
4408 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4409 md_wakeup_thread(mddev->thread);
4410 sysfs_notify_dirent_safe(mddev->sysfs_action);
4414 static struct md_sysfs_entry md_scan_mode =
4415 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4418 last_sync_action_show(struct mddev *mddev, char *page)
4420 return sprintf(page, "%s\n", mddev->last_sync_action);
4423 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4426 mismatch_cnt_show(struct mddev *mddev, char *page)
4428 return sprintf(page, "%llu\n",
4429 (unsigned long long)
4430 atomic64_read(&mddev->resync_mismatches));
4433 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4436 sync_min_show(struct mddev *mddev, char *page)
4438 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4439 mddev->sync_speed_min ? "local": "system");
4443 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4448 if (strncmp(buf, "system", 6)==0) {
4451 rv = kstrtouint(buf, 10, &min);
4457 mddev->sync_speed_min = min;
4461 static struct md_sysfs_entry md_sync_min =
4462 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4465 sync_max_show(struct mddev *mddev, char *page)
4467 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4468 mddev->sync_speed_max ? "local": "system");
4472 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4477 if (strncmp(buf, "system", 6)==0) {
4480 rv = kstrtouint(buf, 10, &max);
4486 mddev->sync_speed_max = max;
4490 static struct md_sysfs_entry md_sync_max =
4491 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4494 degraded_show(struct mddev *mddev, char *page)
4496 return sprintf(page, "%d\n", mddev->degraded);
4498 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4501 sync_force_parallel_show(struct mddev *mddev, char *page)
4503 return sprintf(page, "%d\n", mddev->parallel_resync);
4507 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4511 if (kstrtol(buf, 10, &n))
4514 if (n != 0 && n != 1)
4517 mddev->parallel_resync = n;
4519 if (mddev->sync_thread)
4520 wake_up(&resync_wait);
4525 /* force parallel resync, even with shared block devices */
4526 static struct md_sysfs_entry md_sync_force_parallel =
4527 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4528 sync_force_parallel_show, sync_force_parallel_store);
4531 sync_speed_show(struct mddev *mddev, char *page)
4533 unsigned long resync, dt, db;
4534 if (mddev->curr_resync == 0)
4535 return sprintf(page, "none\n");
4536 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4537 dt = (jiffies - mddev->resync_mark) / HZ;
4539 db = resync - mddev->resync_mark_cnt;
4540 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4543 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4546 sync_completed_show(struct mddev *mddev, char *page)
4548 unsigned long long max_sectors, resync;
4550 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4551 return sprintf(page, "none\n");
4553 if (mddev->curr_resync == 1 ||
4554 mddev->curr_resync == 2)
4555 return sprintf(page, "delayed\n");
4557 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4558 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4559 max_sectors = mddev->resync_max_sectors;
4561 max_sectors = mddev->dev_sectors;
4563 resync = mddev->curr_resync_completed;
4564 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4567 static struct md_sysfs_entry md_sync_completed =
4568 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4571 min_sync_show(struct mddev *mddev, char *page)
4573 return sprintf(page, "%llu\n",
4574 (unsigned long long)mddev->resync_min);
4577 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4579 unsigned long long min;
4582 if (kstrtoull(buf, 10, &min))
4585 spin_lock(&mddev->lock);
4587 if (min > mddev->resync_max)
4591 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4594 /* Round down to multiple of 4K for safety */
4595 mddev->resync_min = round_down(min, 8);
4599 spin_unlock(&mddev->lock);
4603 static struct md_sysfs_entry md_min_sync =
4604 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4607 max_sync_show(struct mddev *mddev, char *page)
4609 if (mddev->resync_max == MaxSector)
4610 return sprintf(page, "max\n");
4612 return sprintf(page, "%llu\n",
4613 (unsigned long long)mddev->resync_max);
4616 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4619 spin_lock(&mddev->lock);
4620 if (strncmp(buf, "max", 3) == 0)
4621 mddev->resync_max = MaxSector;
4623 unsigned long long max;
4627 if (kstrtoull(buf, 10, &max))
4629 if (max < mddev->resync_min)
4633 if (max < mddev->resync_max &&
4635 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4638 /* Must be a multiple of chunk_size */
4639 chunk = mddev->chunk_sectors;
4641 sector_t temp = max;
4644 if (sector_div(temp, chunk))
4647 mddev->resync_max = max;
4649 wake_up(&mddev->recovery_wait);
4652 spin_unlock(&mddev->lock);
4656 static struct md_sysfs_entry md_max_sync =
4657 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4660 suspend_lo_show(struct mddev *mddev, char *page)
4662 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4666 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4668 unsigned long long old, new;
4671 err = kstrtoull(buf, 10, &new);
4674 if (new != (sector_t)new)
4677 err = mddev_lock(mddev);
4681 if (mddev->pers == NULL ||
4682 mddev->pers->quiesce == NULL)
4684 old = mddev->suspend_lo;
4685 mddev->suspend_lo = new;
4687 /* Shrinking suspended region */
4688 mddev->pers->quiesce(mddev, 2);
4690 /* Expanding suspended region - need to wait */
4691 mddev->pers->quiesce(mddev, 1);
4692 mddev->pers->quiesce(mddev, 0);
4696 mddev_unlock(mddev);
4699 static struct md_sysfs_entry md_suspend_lo =
4700 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4703 suspend_hi_show(struct mddev *mddev, char *page)
4705 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4709 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4711 unsigned long long old, new;
4714 err = kstrtoull(buf, 10, &new);
4717 if (new != (sector_t)new)
4720 err = mddev_lock(mddev);
4724 if (mddev->pers == NULL ||
4725 mddev->pers->quiesce == NULL)
4727 old = mddev->suspend_hi;
4728 mddev->suspend_hi = new;
4730 /* Shrinking suspended region */
4731 mddev->pers->quiesce(mddev, 2);
4733 /* Expanding suspended region - need to wait */
4734 mddev->pers->quiesce(mddev, 1);
4735 mddev->pers->quiesce(mddev, 0);
4739 mddev_unlock(mddev);
4742 static struct md_sysfs_entry md_suspend_hi =
4743 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4746 reshape_position_show(struct mddev *mddev, char *page)
4748 if (mddev->reshape_position != MaxSector)
4749 return sprintf(page, "%llu\n",
4750 (unsigned long long)mddev->reshape_position);
4751 strcpy(page, "none\n");
4756 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4758 struct md_rdev *rdev;
4759 unsigned long long new;
4762 err = kstrtoull(buf, 10, &new);
4765 if (new != (sector_t)new)
4767 err = mddev_lock(mddev);
4773 mddev->reshape_position = new;
4774 mddev->delta_disks = 0;
4775 mddev->reshape_backwards = 0;
4776 mddev->new_level = mddev->level;
4777 mddev->new_layout = mddev->layout;
4778 mddev->new_chunk_sectors = mddev->chunk_sectors;
4779 rdev_for_each(rdev, mddev)
4780 rdev->new_data_offset = rdev->data_offset;
4783 mddev_unlock(mddev);
4787 static struct md_sysfs_entry md_reshape_position =
4788 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4789 reshape_position_store);
4792 reshape_direction_show(struct mddev *mddev, char *page)
4794 return sprintf(page, "%s\n",
4795 mddev->reshape_backwards ? "backwards" : "forwards");
4799 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4804 if (cmd_match(buf, "forwards"))
4806 else if (cmd_match(buf, "backwards"))
4810 if (mddev->reshape_backwards == backwards)
4813 err = mddev_lock(mddev);
4816 /* check if we are allowed to change */
4817 if (mddev->delta_disks)
4819 else if (mddev->persistent &&
4820 mddev->major_version == 0)
4823 mddev->reshape_backwards = backwards;
4824 mddev_unlock(mddev);
4828 static struct md_sysfs_entry md_reshape_direction =
4829 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4830 reshape_direction_store);
4833 array_size_show(struct mddev *mddev, char *page)
4835 if (mddev->external_size)
4836 return sprintf(page, "%llu\n",
4837 (unsigned long long)mddev->array_sectors/2);
4839 return sprintf(page, "default\n");
4843 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4848 err = mddev_lock(mddev);
4852 /* cluster raid doesn't support change array_sectors */
4853 if (mddev_is_clustered(mddev))
4856 if (strncmp(buf, "default", 7) == 0) {
4858 sectors = mddev->pers->size(mddev, 0, 0);
4860 sectors = mddev->array_sectors;
4862 mddev->external_size = 0;
4864 if (strict_blocks_to_sectors(buf, §ors) < 0)
4866 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4869 mddev->external_size = 1;
4873 mddev->array_sectors = sectors;
4875 set_capacity(mddev->gendisk, mddev->array_sectors);
4876 revalidate_disk(mddev->gendisk);
4879 mddev_unlock(mddev);
4883 static struct md_sysfs_entry md_array_size =
4884 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4887 static struct attribute *md_default_attrs[] = {
4890 &md_raid_disks.attr,
4891 &md_chunk_size.attr,
4893 &md_resync_start.attr,
4895 &md_new_device.attr,
4896 &md_safe_delay.attr,
4897 &md_array_state.attr,
4898 &md_reshape_position.attr,
4899 &md_reshape_direction.attr,
4900 &md_array_size.attr,
4901 &max_corr_read_errors.attr,
4905 static struct attribute *md_redundancy_attrs[] = {
4907 &md_last_scan_mode.attr,
4908 &md_mismatches.attr,
4911 &md_sync_speed.attr,
4912 &md_sync_force_parallel.attr,
4913 &md_sync_completed.attr,
4916 &md_suspend_lo.attr,
4917 &md_suspend_hi.attr,
4922 static struct attribute_group md_redundancy_group = {
4924 .attrs = md_redundancy_attrs,
4928 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4930 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4931 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4936 spin_lock(&all_mddevs_lock);
4937 if (list_empty(&mddev->all_mddevs)) {
4938 spin_unlock(&all_mddevs_lock);
4942 spin_unlock(&all_mddevs_lock);
4944 rv = entry->show(mddev, page);
4950 md_attr_store(struct kobject *kobj, struct attribute *attr,
4951 const char *page, size_t length)
4953 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4954 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4959 if (!capable(CAP_SYS_ADMIN))
4961 spin_lock(&all_mddevs_lock);
4962 if (list_empty(&mddev->all_mddevs)) {
4963 spin_unlock(&all_mddevs_lock);
4967 spin_unlock(&all_mddevs_lock);
4968 rv = entry->store(mddev, page, length);
4973 static void md_free(struct kobject *ko)
4975 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4977 if (mddev->sysfs_state)
4978 sysfs_put(mddev->sysfs_state);
4981 blk_cleanup_queue(mddev->queue);
4982 if (mddev->gendisk) {
4983 del_gendisk(mddev->gendisk);
4984 put_disk(mddev->gendisk);
4990 static const struct sysfs_ops md_sysfs_ops = {
4991 .show = md_attr_show,
4992 .store = md_attr_store,
4994 static struct kobj_type md_ktype = {
4996 .sysfs_ops = &md_sysfs_ops,
4997 .default_attrs = md_default_attrs,
5002 static void mddev_delayed_delete(struct work_struct *ws)
5004 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5006 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5007 kobject_del(&mddev->kobj);
5008 kobject_put(&mddev->kobj);
5011 static int md_alloc(dev_t dev, char *name)
5013 static DEFINE_MUTEX(disks_mutex);
5014 struct mddev *mddev = mddev_find(dev);
5015 struct gendisk *disk;
5024 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5025 shift = partitioned ? MdpMinorShift : 0;
5026 unit = MINOR(mddev->unit) >> shift;
5028 /* wait for any previous instance of this device to be
5029 * completely removed (mddev_delayed_delete).
5031 flush_workqueue(md_misc_wq);
5033 mutex_lock(&disks_mutex);
5039 /* Need to ensure that 'name' is not a duplicate.
5041 struct mddev *mddev2;
5042 spin_lock(&all_mddevs_lock);
5044 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5045 if (mddev2->gendisk &&
5046 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5047 spin_unlock(&all_mddevs_lock);
5050 spin_unlock(&all_mddevs_lock);
5054 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5057 mddev->queue->queuedata = mddev;
5059 blk_queue_make_request(mddev->queue, md_make_request);
5060 blk_set_stacking_limits(&mddev->queue->limits);
5062 disk = alloc_disk(1 << shift);
5064 blk_cleanup_queue(mddev->queue);
5065 mddev->queue = NULL;
5068 disk->major = MAJOR(mddev->unit);
5069 disk->first_minor = unit << shift;
5071 strcpy(disk->disk_name, name);
5072 else if (partitioned)
5073 sprintf(disk->disk_name, "md_d%d", unit);
5075 sprintf(disk->disk_name, "md%d", unit);
5076 disk->fops = &md_fops;
5077 disk->private_data = mddev;
5078 disk->queue = mddev->queue;
5079 blk_queue_write_cache(mddev->queue, true, true);
5080 /* Allow extended partitions. This makes the
5081 * 'mdp' device redundant, but we can't really
5084 disk->flags |= GENHD_FL_EXT_DEVT;
5085 mddev->gendisk = disk;
5086 /* As soon as we call add_disk(), another thread could get
5087 * through to md_open, so make sure it doesn't get too far
5089 mutex_lock(&mddev->open_mutex);
5092 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5093 &disk_to_dev(disk)->kobj, "%s", "md");
5095 /* This isn't possible, but as kobject_init_and_add is marked
5096 * __must_check, we must do something with the result
5098 pr_debug("md: cannot register %s/md - name in use\n",
5102 if (mddev->kobj.sd &&
5103 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5104 pr_debug("pointless warning\n");
5105 mutex_unlock(&mddev->open_mutex);
5107 mutex_unlock(&disks_mutex);
5108 if (!error && mddev->kobj.sd) {
5109 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5110 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5116 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5118 md_alloc(dev, NULL);
5122 static int add_named_array(const char *val, struct kernel_param *kp)
5124 /* val must be "md_*" where * is not all digits.
5125 * We allocate an array with a large free minor number, and
5126 * set the name to val. val must not already be an active name.
5128 int len = strlen(val);
5129 char buf[DISK_NAME_LEN];
5131 while (len && val[len-1] == '\n')
5133 if (len >= DISK_NAME_LEN)
5135 strlcpy(buf, val, len+1);
5136 if (strncmp(buf, "md_", 3) != 0)
5138 return md_alloc(0, buf);
5141 static void md_safemode_timeout(unsigned long data)
5143 struct mddev *mddev = (struct mddev *) data;
5145 if (!atomic_read(&mddev->writes_pending)) {
5146 mddev->safemode = 1;
5147 if (mddev->external)
5148 sysfs_notify_dirent_safe(mddev->sysfs_state);
5150 md_wakeup_thread(mddev->thread);
5153 static int start_dirty_degraded;
5155 int md_run(struct mddev *mddev)
5158 struct md_rdev *rdev;
5159 struct md_personality *pers;
5161 if (list_empty(&mddev->disks))
5162 /* cannot run an array with no devices.. */
5167 /* Cannot run until previous stop completes properly */
5168 if (mddev->sysfs_active)
5172 * Analyze all RAID superblock(s)
5174 if (!mddev->raid_disks) {
5175 if (!mddev->persistent)
5180 if (mddev->level != LEVEL_NONE)
5181 request_module("md-level-%d", mddev->level);
5182 else if (mddev->clevel[0])
5183 request_module("md-%s", mddev->clevel);
5186 * Drop all container device buffers, from now on
5187 * the only valid external interface is through the md
5190 rdev_for_each(rdev, mddev) {
5191 if (test_bit(Faulty, &rdev->flags))
5193 sync_blockdev(rdev->bdev);
5194 invalidate_bdev(rdev->bdev);
5196 /* perform some consistency tests on the device.
5197 * We don't want the data to overlap the metadata,
5198 * Internal Bitmap issues have been handled elsewhere.
5200 if (rdev->meta_bdev) {
5201 /* Nothing to check */;
5202 } else if (rdev->data_offset < rdev->sb_start) {
5203 if (mddev->dev_sectors &&
5204 rdev->data_offset + mddev->dev_sectors
5206 pr_warn("md: %s: data overlaps metadata\n",
5211 if (rdev->sb_start + rdev->sb_size/512
5212 > rdev->data_offset) {
5213 pr_warn("md: %s: metadata overlaps data\n",
5218 sysfs_notify_dirent_safe(rdev->sysfs_state);
5221 if (mddev->bio_set == NULL) {
5222 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5223 if (!mddev->bio_set)
5227 spin_lock(&pers_lock);
5228 pers = find_pers(mddev->level, mddev->clevel);
5229 if (!pers || !try_module_get(pers->owner)) {
5230 spin_unlock(&pers_lock);
5231 if (mddev->level != LEVEL_NONE)
5232 pr_warn("md: personality for level %d is not loaded!\n",
5235 pr_warn("md: personality for level %s is not loaded!\n",
5239 spin_unlock(&pers_lock);
5240 if (mddev->level != pers->level) {
5241 mddev->level = pers->level;
5242 mddev->new_level = pers->level;
5244 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5246 if (mddev->reshape_position != MaxSector &&
5247 pers->start_reshape == NULL) {
5248 /* This personality cannot handle reshaping... */
5249 module_put(pers->owner);
5253 if (pers->sync_request) {
5254 /* Warn if this is a potentially silly
5257 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5258 struct md_rdev *rdev2;
5261 rdev_for_each(rdev, mddev)
5262 rdev_for_each(rdev2, mddev) {
5264 rdev->bdev->bd_contains ==
5265 rdev2->bdev->bd_contains) {
5266 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5268 bdevname(rdev->bdev,b),
5269 bdevname(rdev2->bdev,b2));
5275 pr_warn("True protection against single-disk failure might be compromised.\n");
5278 mddev->recovery = 0;
5279 /* may be over-ridden by personality */
5280 mddev->resync_max_sectors = mddev->dev_sectors;
5282 mddev->ok_start_degraded = start_dirty_degraded;
5284 if (start_readonly && mddev->ro == 0)
5285 mddev->ro = 2; /* read-only, but switch on first write */
5288 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5289 * up mddev->thread. It is important to initialize critical
5290 * resources for mddev->thread BEFORE calling pers->run().
5292 err = pers->run(mddev);
5294 pr_warn("md: pers->run() failed ...\n");
5295 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5296 WARN_ONCE(!mddev->external_size,
5297 "%s: default size too small, but 'external_size' not in effect?\n",
5299 pr_warn("md: invalid array_size %llu > default size %llu\n",
5300 (unsigned long long)mddev->array_sectors / 2,
5301 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5304 if (err == 0 && pers->sync_request &&
5305 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5306 struct bitmap *bitmap;
5308 bitmap = bitmap_create(mddev, -1);
5309 if (IS_ERR(bitmap)) {
5310 err = PTR_ERR(bitmap);
5311 pr_warn("%s: failed to create bitmap (%d)\n",
5312 mdname(mddev), err);
5314 mddev->bitmap = bitmap;
5318 mddev_detach(mddev);
5320 pers->free(mddev, mddev->private);
5321 mddev->private = NULL;
5322 module_put(pers->owner);
5323 bitmap_destroy(mddev);
5329 rdev_for_each(rdev, mddev) {
5330 if (rdev->raid_disk >= 0 &&
5331 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5336 if (mddev->degraded)
5339 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5341 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5342 mddev->queue->backing_dev_info->congested_data = mddev;
5343 mddev->queue->backing_dev_info->congested_fn = md_congested;
5345 if (pers->sync_request) {
5346 if (mddev->kobj.sd &&
5347 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5348 pr_warn("md: cannot register extra attributes for %s\n",
5350 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5351 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5354 atomic_set(&mddev->writes_pending,0);
5355 atomic_set(&mddev->max_corr_read_errors,
5356 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5357 mddev->safemode = 0;
5358 if (mddev_is_clustered(mddev))
5359 mddev->safemode_delay = 0;
5361 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5364 spin_lock(&mddev->lock);
5366 spin_unlock(&mddev->lock);
5367 rdev_for_each(rdev, mddev)
5368 if (rdev->raid_disk >= 0)
5369 if (sysfs_link_rdev(mddev, rdev))
5370 /* failure here is OK */;
5372 if (mddev->degraded && !mddev->ro)
5373 /* This ensures that recovering status is reported immediately
5374 * via sysfs - until a lack of spares is confirmed.
5376 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5377 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5379 if (mddev->sb_flags)
5380 md_update_sb(mddev, 0);
5382 md_new_event(mddev);
5383 sysfs_notify_dirent_safe(mddev->sysfs_state);
5384 sysfs_notify_dirent_safe(mddev->sysfs_action);
5385 sysfs_notify(&mddev->kobj, NULL, "degraded");
5388 EXPORT_SYMBOL_GPL(md_run);
5390 static int do_md_run(struct mddev *mddev)
5394 err = md_run(mddev);
5397 err = bitmap_load(mddev);
5399 bitmap_destroy(mddev);
5403 if (mddev_is_clustered(mddev))
5404 md_allow_write(mddev);
5406 md_wakeup_thread(mddev->thread);
5407 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5409 set_capacity(mddev->gendisk, mddev->array_sectors);
5410 revalidate_disk(mddev->gendisk);
5412 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5417 static int restart_array(struct mddev *mddev)
5419 struct gendisk *disk = mddev->gendisk;
5421 /* Complain if it has no devices */
5422 if (list_empty(&mddev->disks))
5428 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5429 struct md_rdev *rdev;
5430 bool has_journal = false;
5433 rdev_for_each_rcu(rdev, mddev) {
5434 if (test_bit(Journal, &rdev->flags) &&
5435 !test_bit(Faulty, &rdev->flags)) {
5442 /* Don't restart rw with journal missing/faulty */
5447 mddev->safemode = 0;
5449 set_disk_ro(disk, 0);
5450 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5451 /* Kick recovery or resync if necessary */
5452 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5453 md_wakeup_thread(mddev->thread);
5454 md_wakeup_thread(mddev->sync_thread);
5455 sysfs_notify_dirent_safe(mddev->sysfs_state);
5459 static void md_clean(struct mddev *mddev)
5461 mddev->array_sectors = 0;
5462 mddev->external_size = 0;
5463 mddev->dev_sectors = 0;
5464 mddev->raid_disks = 0;
5465 mddev->recovery_cp = 0;
5466 mddev->resync_min = 0;
5467 mddev->resync_max = MaxSector;
5468 mddev->reshape_position = MaxSector;
5469 mddev->external = 0;
5470 mddev->persistent = 0;
5471 mddev->level = LEVEL_NONE;
5472 mddev->clevel[0] = 0;
5474 mddev->sb_flags = 0;
5476 mddev->metadata_type[0] = 0;
5477 mddev->chunk_sectors = 0;
5478 mddev->ctime = mddev->utime = 0;
5480 mddev->max_disks = 0;
5482 mddev->can_decrease_events = 0;
5483 mddev->delta_disks = 0;
5484 mddev->reshape_backwards = 0;
5485 mddev->new_level = LEVEL_NONE;
5486 mddev->new_layout = 0;
5487 mddev->new_chunk_sectors = 0;
5488 mddev->curr_resync = 0;
5489 atomic64_set(&mddev->resync_mismatches, 0);
5490 mddev->suspend_lo = mddev->suspend_hi = 0;
5491 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5492 mddev->recovery = 0;
5495 mddev->degraded = 0;
5496 mddev->safemode = 0;
5497 mddev->private = NULL;
5498 mddev->cluster_info = NULL;
5499 mddev->bitmap_info.offset = 0;
5500 mddev->bitmap_info.default_offset = 0;
5501 mddev->bitmap_info.default_space = 0;
5502 mddev->bitmap_info.chunksize = 0;
5503 mddev->bitmap_info.daemon_sleep = 0;
5504 mddev->bitmap_info.max_write_behind = 0;
5505 mddev->bitmap_info.nodes = 0;
5508 static void __md_stop_writes(struct mddev *mddev)
5510 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5511 flush_workqueue(md_misc_wq);
5512 if (mddev->sync_thread) {
5513 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5514 md_reap_sync_thread(mddev);
5517 del_timer_sync(&mddev->safemode_timer);
5519 if (mddev->pers && mddev->pers->quiesce) {
5520 mddev->pers->quiesce(mddev, 1);
5521 mddev->pers->quiesce(mddev, 0);
5523 bitmap_flush(mddev);
5525 if (mddev->ro == 0 &&
5526 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5528 /* mark array as shutdown cleanly */
5529 if (!mddev_is_clustered(mddev))
5531 md_update_sb(mddev, 1);
5535 void md_stop_writes(struct mddev *mddev)
5537 mddev_lock_nointr(mddev);
5538 __md_stop_writes(mddev);
5539 mddev_unlock(mddev);
5541 EXPORT_SYMBOL_GPL(md_stop_writes);
5543 static void mddev_detach(struct mddev *mddev)
5545 struct bitmap *bitmap = mddev->bitmap;
5546 /* wait for behind writes to complete */
5547 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5548 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
5550 /* need to kick something here to make sure I/O goes? */
5551 wait_event(bitmap->behind_wait,
5552 atomic_read(&bitmap->behind_writes) == 0);
5554 if (mddev->pers && mddev->pers->quiesce) {
5555 mddev->pers->quiesce(mddev, 1);
5556 mddev->pers->quiesce(mddev, 0);
5558 md_unregister_thread(&mddev->thread);
5560 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5563 static void __md_stop(struct mddev *mddev)
5565 struct md_personality *pers = mddev->pers;
5566 mddev_detach(mddev);
5567 /* Ensure ->event_work is done */
5568 flush_workqueue(md_misc_wq);
5569 spin_lock(&mddev->lock);
5571 spin_unlock(&mddev->lock);
5572 pers->free(mddev, mddev->private);
5573 mddev->private = NULL;
5574 if (pers->sync_request && mddev->to_remove == NULL)
5575 mddev->to_remove = &md_redundancy_group;
5576 module_put(pers->owner);
5577 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5580 void md_stop(struct mddev *mddev)
5582 /* stop the array and free an attached data structures.
5583 * This is called from dm-raid
5586 bitmap_destroy(mddev);
5588 bioset_free(mddev->bio_set);
5591 EXPORT_SYMBOL_GPL(md_stop);
5593 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5598 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5600 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5601 md_wakeup_thread(mddev->thread);
5603 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5604 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5605 if (mddev->sync_thread)
5606 /* Thread might be blocked waiting for metadata update
5607 * which will now never happen */
5608 wake_up_process(mddev->sync_thread->tsk);
5610 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5612 mddev_unlock(mddev);
5613 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5615 wait_event(mddev->sb_wait,
5616 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5617 mddev_lock_nointr(mddev);
5619 mutex_lock(&mddev->open_mutex);
5620 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5621 mddev->sync_thread ||
5622 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5623 pr_warn("md: %s still in use.\n",mdname(mddev));
5625 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5626 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5627 md_wakeup_thread(mddev->thread);
5633 __md_stop_writes(mddev);
5639 set_disk_ro(mddev->gendisk, 1);
5640 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5641 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5642 md_wakeup_thread(mddev->thread);
5643 sysfs_notify_dirent_safe(mddev->sysfs_state);
5647 mutex_unlock(&mddev->open_mutex);
5652 * 0 - completely stop and dis-assemble array
5653 * 2 - stop but do not disassemble array
5655 static int do_md_stop(struct mddev *mddev, int mode,
5656 struct block_device *bdev)
5658 struct gendisk *disk = mddev->gendisk;
5659 struct md_rdev *rdev;
5662 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5664 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5665 md_wakeup_thread(mddev->thread);
5667 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5668 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5669 if (mddev->sync_thread)
5670 /* Thread might be blocked waiting for metadata update
5671 * which will now never happen */
5672 wake_up_process(mddev->sync_thread->tsk);
5674 mddev_unlock(mddev);
5675 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5676 !test_bit(MD_RECOVERY_RUNNING,
5677 &mddev->recovery)));
5678 mddev_lock_nointr(mddev);
5680 mutex_lock(&mddev->open_mutex);
5681 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5682 mddev->sysfs_active ||
5683 mddev->sync_thread ||
5684 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5685 pr_warn("md: %s still in use.\n",mdname(mddev));
5686 mutex_unlock(&mddev->open_mutex);
5688 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5689 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5690 md_wakeup_thread(mddev->thread);
5696 set_disk_ro(disk, 0);
5698 __md_stop_writes(mddev);
5700 mddev->queue->backing_dev_info->congested_fn = NULL;
5702 /* tell userspace to handle 'inactive' */
5703 sysfs_notify_dirent_safe(mddev->sysfs_state);
5705 rdev_for_each(rdev, mddev)
5706 if (rdev->raid_disk >= 0)
5707 sysfs_unlink_rdev(mddev, rdev);
5709 set_capacity(disk, 0);
5710 mutex_unlock(&mddev->open_mutex);
5712 revalidate_disk(disk);
5717 mutex_unlock(&mddev->open_mutex);
5719 * Free resources if final stop
5722 pr_info("md: %s stopped.\n", mdname(mddev));
5724 bitmap_destroy(mddev);
5725 if (mddev->bitmap_info.file) {
5726 struct file *f = mddev->bitmap_info.file;
5727 spin_lock(&mddev->lock);
5728 mddev->bitmap_info.file = NULL;
5729 spin_unlock(&mddev->lock);
5732 mddev->bitmap_info.offset = 0;
5734 export_array(mddev);
5737 if (mddev->hold_active == UNTIL_STOP)
5738 mddev->hold_active = 0;
5740 md_new_event(mddev);
5741 sysfs_notify_dirent_safe(mddev->sysfs_state);
5746 static void autorun_array(struct mddev *mddev)
5748 struct md_rdev *rdev;
5751 if (list_empty(&mddev->disks))
5754 pr_info("md: running: ");
5756 rdev_for_each(rdev, mddev) {
5757 char b[BDEVNAME_SIZE];
5758 pr_cont("<%s>", bdevname(rdev->bdev,b));
5762 err = do_md_run(mddev);
5764 pr_warn("md: do_md_run() returned %d\n", err);
5765 do_md_stop(mddev, 0, NULL);
5770 * lets try to run arrays based on all disks that have arrived
5771 * until now. (those are in pending_raid_disks)
5773 * the method: pick the first pending disk, collect all disks with
5774 * the same UUID, remove all from the pending list and put them into
5775 * the 'same_array' list. Then order this list based on superblock
5776 * update time (freshest comes first), kick out 'old' disks and
5777 * compare superblocks. If everything's fine then run it.
5779 * If "unit" is allocated, then bump its reference count
5781 static void autorun_devices(int part)
5783 struct md_rdev *rdev0, *rdev, *tmp;
5784 struct mddev *mddev;
5785 char b[BDEVNAME_SIZE];
5787 pr_info("md: autorun ...\n");
5788 while (!list_empty(&pending_raid_disks)) {
5791 LIST_HEAD(candidates);
5792 rdev0 = list_entry(pending_raid_disks.next,
5793 struct md_rdev, same_set);
5795 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
5796 INIT_LIST_HEAD(&candidates);
5797 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5798 if (super_90_load(rdev, rdev0, 0) >= 0) {
5799 pr_debug("md: adding %s ...\n",
5800 bdevname(rdev->bdev,b));
5801 list_move(&rdev->same_set, &candidates);
5804 * now we have a set of devices, with all of them having
5805 * mostly sane superblocks. It's time to allocate the
5809 dev = MKDEV(mdp_major,
5810 rdev0->preferred_minor << MdpMinorShift);
5811 unit = MINOR(dev) >> MdpMinorShift;
5813 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5816 if (rdev0->preferred_minor != unit) {
5817 pr_warn("md: unit number in %s is bad: %d\n",
5818 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5822 md_probe(dev, NULL, NULL);
5823 mddev = mddev_find(dev);
5824 if (!mddev || !mddev->gendisk) {
5829 if (mddev_lock(mddev))
5830 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
5831 else if (mddev->raid_disks || mddev->major_version
5832 || !list_empty(&mddev->disks)) {
5833 pr_warn("md: %s already running, cannot run %s\n",
5834 mdname(mddev), bdevname(rdev0->bdev,b));
5835 mddev_unlock(mddev);
5837 pr_debug("md: created %s\n", mdname(mddev));
5838 mddev->persistent = 1;
5839 rdev_for_each_list(rdev, tmp, &candidates) {
5840 list_del_init(&rdev->same_set);
5841 if (bind_rdev_to_array(rdev, mddev))
5844 autorun_array(mddev);
5845 mddev_unlock(mddev);
5847 /* on success, candidates will be empty, on error
5850 rdev_for_each_list(rdev, tmp, &candidates) {
5851 list_del_init(&rdev->same_set);
5856 pr_info("md: ... autorun DONE.\n");
5858 #endif /* !MODULE */
5860 static int get_version(void __user *arg)
5864 ver.major = MD_MAJOR_VERSION;
5865 ver.minor = MD_MINOR_VERSION;
5866 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5868 if (copy_to_user(arg, &ver, sizeof(ver)))
5874 static int get_array_info(struct mddev *mddev, void __user *arg)
5876 mdu_array_info_t info;
5877 int nr,working,insync,failed,spare;
5878 struct md_rdev *rdev;
5880 nr = working = insync = failed = spare = 0;
5882 rdev_for_each_rcu(rdev, mddev) {
5884 if (test_bit(Faulty, &rdev->flags))
5888 if (test_bit(In_sync, &rdev->flags))
5890 else if (test_bit(Journal, &rdev->flags))
5891 /* TODO: add journal count to md_u.h */
5899 info.major_version = mddev->major_version;
5900 info.minor_version = mddev->minor_version;
5901 info.patch_version = MD_PATCHLEVEL_VERSION;
5902 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
5903 info.level = mddev->level;
5904 info.size = mddev->dev_sectors / 2;
5905 if (info.size != mddev->dev_sectors / 2) /* overflow */
5908 info.raid_disks = mddev->raid_disks;
5909 info.md_minor = mddev->md_minor;
5910 info.not_persistent= !mddev->persistent;
5912 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
5915 info.state = (1<<MD_SB_CLEAN);
5916 if (mddev->bitmap && mddev->bitmap_info.offset)
5917 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5918 if (mddev_is_clustered(mddev))
5919 info.state |= (1<<MD_SB_CLUSTERED);
5920 info.active_disks = insync;
5921 info.working_disks = working;
5922 info.failed_disks = failed;
5923 info.spare_disks = spare;
5925 info.layout = mddev->layout;
5926 info.chunk_size = mddev->chunk_sectors << 9;
5928 if (copy_to_user(arg, &info, sizeof(info)))
5934 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5936 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5940 file = kzalloc(sizeof(*file), GFP_NOIO);
5945 spin_lock(&mddev->lock);
5946 /* bitmap enabled */
5947 if (mddev->bitmap_info.file) {
5948 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5949 sizeof(file->pathname));
5953 memmove(file->pathname, ptr,
5954 sizeof(file->pathname)-(ptr-file->pathname));
5956 spin_unlock(&mddev->lock);
5959 copy_to_user(arg, file, sizeof(*file)))
5966 static int get_disk_info(struct mddev *mddev, void __user * arg)
5968 mdu_disk_info_t info;
5969 struct md_rdev *rdev;
5971 if (copy_from_user(&info, arg, sizeof(info)))
5975 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5977 info.major = MAJOR(rdev->bdev->bd_dev);
5978 info.minor = MINOR(rdev->bdev->bd_dev);
5979 info.raid_disk = rdev->raid_disk;
5981 if (test_bit(Faulty, &rdev->flags))
5982 info.state |= (1<<MD_DISK_FAULTY);
5983 else if (test_bit(In_sync, &rdev->flags)) {
5984 info.state |= (1<<MD_DISK_ACTIVE);
5985 info.state |= (1<<MD_DISK_SYNC);
5987 if (test_bit(Journal, &rdev->flags))
5988 info.state |= (1<<MD_DISK_JOURNAL);
5989 if (test_bit(WriteMostly, &rdev->flags))
5990 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5991 if (test_bit(FailFast, &rdev->flags))
5992 info.state |= (1<<MD_DISK_FAILFAST);
5994 info.major = info.minor = 0;
5995 info.raid_disk = -1;
5996 info.state = (1<<MD_DISK_REMOVED);
6000 if (copy_to_user(arg, &info, sizeof(info)))
6006 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6008 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6009 struct md_rdev *rdev;
6010 dev_t dev = MKDEV(info->major,info->minor);
6012 if (mddev_is_clustered(mddev) &&
6013 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6014 pr_warn("%s: Cannot add to clustered mddev.\n",
6019 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6022 if (!mddev->raid_disks) {
6024 /* expecting a device which has a superblock */
6025 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6027 pr_warn("md: md_import_device returned %ld\n",
6029 return PTR_ERR(rdev);
6031 if (!list_empty(&mddev->disks)) {
6032 struct md_rdev *rdev0
6033 = list_entry(mddev->disks.next,
6034 struct md_rdev, same_set);
6035 err = super_types[mddev->major_version]
6036 .load_super(rdev, rdev0, mddev->minor_version);
6038 pr_warn("md: %s has different UUID to %s\n",
6039 bdevname(rdev->bdev,b),
6040 bdevname(rdev0->bdev,b2));
6045 err = bind_rdev_to_array(rdev, mddev);
6052 * add_new_disk can be used once the array is assembled
6053 * to add "hot spares". They must already have a superblock
6058 if (!mddev->pers->hot_add_disk) {
6059 pr_warn("%s: personality does not support diskops!\n",
6063 if (mddev->persistent)
6064 rdev = md_import_device(dev, mddev->major_version,
6065 mddev->minor_version);
6067 rdev = md_import_device(dev, -1, -1);
6069 pr_warn("md: md_import_device returned %ld\n",
6071 return PTR_ERR(rdev);
6073 /* set saved_raid_disk if appropriate */
6074 if (!mddev->persistent) {
6075 if (info->state & (1<<MD_DISK_SYNC) &&
6076 info->raid_disk < mddev->raid_disks) {
6077 rdev->raid_disk = info->raid_disk;
6078 set_bit(In_sync, &rdev->flags);
6079 clear_bit(Bitmap_sync, &rdev->flags);
6081 rdev->raid_disk = -1;
6082 rdev->saved_raid_disk = rdev->raid_disk;
6084 super_types[mddev->major_version].
6085 validate_super(mddev, rdev);
6086 if ((info->state & (1<<MD_DISK_SYNC)) &&
6087 rdev->raid_disk != info->raid_disk) {
6088 /* This was a hot-add request, but events doesn't
6089 * match, so reject it.
6095 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6096 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6097 set_bit(WriteMostly, &rdev->flags);
6099 clear_bit(WriteMostly, &rdev->flags);
6100 if (info->state & (1<<MD_DISK_FAILFAST))
6101 set_bit(FailFast, &rdev->flags);
6103 clear_bit(FailFast, &rdev->flags);
6105 if (info->state & (1<<MD_DISK_JOURNAL)) {
6106 struct md_rdev *rdev2;
6107 bool has_journal = false;
6109 /* make sure no existing journal disk */
6110 rdev_for_each(rdev2, mddev) {
6111 if (test_bit(Journal, &rdev2->flags)) {
6120 set_bit(Journal, &rdev->flags);
6123 * check whether the device shows up in other nodes
6125 if (mddev_is_clustered(mddev)) {
6126 if (info->state & (1 << MD_DISK_CANDIDATE))
6127 set_bit(Candidate, &rdev->flags);
6128 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6129 /* --add initiated by this node */
6130 err = md_cluster_ops->add_new_disk(mddev, rdev);
6138 rdev->raid_disk = -1;
6139 err = bind_rdev_to_array(rdev, mddev);
6144 if (mddev_is_clustered(mddev)) {
6145 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6147 err = md_cluster_ops->new_disk_ack(mddev,
6150 md_kick_rdev_from_array(rdev);
6154 md_cluster_ops->add_new_disk_cancel(mddev);
6156 err = add_bound_rdev(rdev);
6160 err = add_bound_rdev(rdev);
6165 /* otherwise, add_new_disk is only allowed
6166 * for major_version==0 superblocks
6168 if (mddev->major_version != 0) {
6169 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6173 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6175 rdev = md_import_device(dev, -1, 0);
6177 pr_warn("md: error, md_import_device() returned %ld\n",
6179 return PTR_ERR(rdev);
6181 rdev->desc_nr = info->number;
6182 if (info->raid_disk < mddev->raid_disks)
6183 rdev->raid_disk = info->raid_disk;
6185 rdev->raid_disk = -1;
6187 if (rdev->raid_disk < mddev->raid_disks)
6188 if (info->state & (1<<MD_DISK_SYNC))
6189 set_bit(In_sync, &rdev->flags);
6191 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6192 set_bit(WriteMostly, &rdev->flags);
6193 if (info->state & (1<<MD_DISK_FAILFAST))
6194 set_bit(FailFast, &rdev->flags);
6196 if (!mddev->persistent) {
6197 pr_debug("md: nonpersistent superblock ...\n");
6198 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6200 rdev->sb_start = calc_dev_sboffset(rdev);
6201 rdev->sectors = rdev->sb_start;
6203 err = bind_rdev_to_array(rdev, mddev);
6213 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6215 char b[BDEVNAME_SIZE];
6216 struct md_rdev *rdev;
6218 rdev = find_rdev(mddev, dev);
6222 if (rdev->raid_disk < 0)
6225 clear_bit(Blocked, &rdev->flags);
6226 remove_and_add_spares(mddev, rdev);
6228 if (rdev->raid_disk >= 0)
6232 if (mddev_is_clustered(mddev))
6233 md_cluster_ops->remove_disk(mddev, rdev);
6235 md_kick_rdev_from_array(rdev);
6236 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6238 md_wakeup_thread(mddev->thread);
6240 md_update_sb(mddev, 1);
6241 md_new_event(mddev);
6245 pr_debug("md: cannot remove active disk %s from %s ...\n",
6246 bdevname(rdev->bdev,b), mdname(mddev));
6250 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6252 char b[BDEVNAME_SIZE];
6254 struct md_rdev *rdev;
6259 if (mddev->major_version != 0) {
6260 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6264 if (!mddev->pers->hot_add_disk) {
6265 pr_warn("%s: personality does not support diskops!\n",
6270 rdev = md_import_device(dev, -1, 0);
6272 pr_warn("md: error, md_import_device() returned %ld\n",
6277 if (mddev->persistent)
6278 rdev->sb_start = calc_dev_sboffset(rdev);
6280 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6282 rdev->sectors = rdev->sb_start;
6284 if (test_bit(Faulty, &rdev->flags)) {
6285 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6286 bdevname(rdev->bdev,b), mdname(mddev));
6291 clear_bit(In_sync, &rdev->flags);
6293 rdev->saved_raid_disk = -1;
6294 err = bind_rdev_to_array(rdev, mddev);
6299 * The rest should better be atomic, we can have disk failures
6300 * noticed in interrupt contexts ...
6303 rdev->raid_disk = -1;
6305 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6307 md_update_sb(mddev, 1);
6309 * Kick recovery, maybe this spare has to be added to the
6310 * array immediately.
6312 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6313 md_wakeup_thread(mddev->thread);
6314 md_new_event(mddev);
6322 static int set_bitmap_file(struct mddev *mddev, int fd)
6327 if (!mddev->pers->quiesce || !mddev->thread)
6329 if (mddev->recovery || mddev->sync_thread)
6331 /* we should be able to change the bitmap.. */
6335 struct inode *inode;
6338 if (mddev->bitmap || mddev->bitmap_info.file)
6339 return -EEXIST; /* cannot add when bitmap is present */
6343 pr_warn("%s: error: failed to get bitmap file\n",
6348 inode = f->f_mapping->host;
6349 if (!S_ISREG(inode->i_mode)) {
6350 pr_warn("%s: error: bitmap file must be a regular file\n",
6353 } else if (!(f->f_mode & FMODE_WRITE)) {
6354 pr_warn("%s: error: bitmap file must open for write\n",
6357 } else if (atomic_read(&inode->i_writecount) != 1) {
6358 pr_warn("%s: error: bitmap file is already in use\n",
6366 mddev->bitmap_info.file = f;
6367 mddev->bitmap_info.offset = 0; /* file overrides offset */
6368 } else if (mddev->bitmap == NULL)
6369 return -ENOENT; /* cannot remove what isn't there */
6372 mddev->pers->quiesce(mddev, 1);
6374 struct bitmap *bitmap;
6376 bitmap = bitmap_create(mddev, -1);
6377 if (!IS_ERR(bitmap)) {
6378 mddev->bitmap = bitmap;
6379 err = bitmap_load(mddev);
6381 err = PTR_ERR(bitmap);
6383 if (fd < 0 || err) {
6384 bitmap_destroy(mddev);
6385 fd = -1; /* make sure to put the file */
6387 mddev->pers->quiesce(mddev, 0);
6390 struct file *f = mddev->bitmap_info.file;
6392 spin_lock(&mddev->lock);
6393 mddev->bitmap_info.file = NULL;
6394 spin_unlock(&mddev->lock);
6403 * set_array_info is used two different ways
6404 * The original usage is when creating a new array.
6405 * In this usage, raid_disks is > 0 and it together with
6406 * level, size, not_persistent,layout,chunksize determine the
6407 * shape of the array.
6408 * This will always create an array with a type-0.90.0 superblock.
6409 * The newer usage is when assembling an array.
6410 * In this case raid_disks will be 0, and the major_version field is
6411 * use to determine which style super-blocks are to be found on the devices.
6412 * The minor and patch _version numbers are also kept incase the
6413 * super_block handler wishes to interpret them.
6415 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6418 if (info->raid_disks == 0) {
6419 /* just setting version number for superblock loading */
6420 if (info->major_version < 0 ||
6421 info->major_version >= ARRAY_SIZE(super_types) ||
6422 super_types[info->major_version].name == NULL) {
6423 /* maybe try to auto-load a module? */
6424 pr_warn("md: superblock version %d not known\n",
6425 info->major_version);
6428 mddev->major_version = info->major_version;
6429 mddev->minor_version = info->minor_version;
6430 mddev->patch_version = info->patch_version;
6431 mddev->persistent = !info->not_persistent;
6432 /* ensure mddev_put doesn't delete this now that there
6433 * is some minimal configuration.
6435 mddev->ctime = ktime_get_real_seconds();
6438 mddev->major_version = MD_MAJOR_VERSION;
6439 mddev->minor_version = MD_MINOR_VERSION;
6440 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6441 mddev->ctime = ktime_get_real_seconds();
6443 mddev->level = info->level;
6444 mddev->clevel[0] = 0;
6445 mddev->dev_sectors = 2 * (sector_t)info->size;
6446 mddev->raid_disks = info->raid_disks;
6447 /* don't set md_minor, it is determined by which /dev/md* was
6450 if (info->state & (1<<MD_SB_CLEAN))
6451 mddev->recovery_cp = MaxSector;
6453 mddev->recovery_cp = 0;
6454 mddev->persistent = ! info->not_persistent;
6455 mddev->external = 0;
6457 mddev->layout = info->layout;
6458 mddev->chunk_sectors = info->chunk_size >> 9;
6460 mddev->max_disks = MD_SB_DISKS;
6462 if (mddev->persistent) {
6464 mddev->sb_flags = 0;
6466 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6468 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6469 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6470 mddev->bitmap_info.offset = 0;
6472 mddev->reshape_position = MaxSector;
6475 * Generate a 128 bit UUID
6477 get_random_bytes(mddev->uuid, 16);
6479 mddev->new_level = mddev->level;
6480 mddev->new_chunk_sectors = mddev->chunk_sectors;
6481 mddev->new_layout = mddev->layout;
6482 mddev->delta_disks = 0;
6483 mddev->reshape_backwards = 0;
6488 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6490 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6492 if (mddev->external_size)
6495 mddev->array_sectors = array_sectors;
6497 EXPORT_SYMBOL(md_set_array_sectors);
6499 static int update_size(struct mddev *mddev, sector_t num_sectors)
6501 struct md_rdev *rdev;
6503 int fit = (num_sectors == 0);
6505 /* cluster raid doesn't support update size */
6506 if (mddev_is_clustered(mddev))
6509 if (mddev->pers->resize == NULL)
6511 /* The "num_sectors" is the number of sectors of each device that
6512 * is used. This can only make sense for arrays with redundancy.
6513 * linear and raid0 always use whatever space is available. We can only
6514 * consider changing this number if no resync or reconstruction is
6515 * happening, and if the new size is acceptable. It must fit before the
6516 * sb_start or, if that is <data_offset, it must fit before the size
6517 * of each device. If num_sectors is zero, we find the largest size
6520 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6526 rdev_for_each(rdev, mddev) {
6527 sector_t avail = rdev->sectors;
6529 if (fit && (num_sectors == 0 || num_sectors > avail))
6530 num_sectors = avail;
6531 if (avail < num_sectors)
6534 rv = mddev->pers->resize(mddev, num_sectors);
6536 revalidate_disk(mddev->gendisk);
6540 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6543 struct md_rdev *rdev;
6544 /* change the number of raid disks */
6545 if (mddev->pers->check_reshape == NULL)
6549 if (raid_disks <= 0 ||
6550 (mddev->max_disks && raid_disks >= mddev->max_disks))
6552 if (mddev->sync_thread ||
6553 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6554 mddev->reshape_position != MaxSector)
6557 rdev_for_each(rdev, mddev) {
6558 if (mddev->raid_disks < raid_disks &&
6559 rdev->data_offset < rdev->new_data_offset)
6561 if (mddev->raid_disks > raid_disks &&
6562 rdev->data_offset > rdev->new_data_offset)
6566 mddev->delta_disks = raid_disks - mddev->raid_disks;
6567 if (mddev->delta_disks < 0)
6568 mddev->reshape_backwards = 1;
6569 else if (mddev->delta_disks > 0)
6570 mddev->reshape_backwards = 0;
6572 rv = mddev->pers->check_reshape(mddev);
6574 mddev->delta_disks = 0;
6575 mddev->reshape_backwards = 0;
6581 * update_array_info is used to change the configuration of an
6583 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6584 * fields in the info are checked against the array.
6585 * Any differences that cannot be handled will cause an error.
6586 * Normally, only one change can be managed at a time.
6588 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6594 /* calculate expected state,ignoring low bits */
6595 if (mddev->bitmap && mddev->bitmap_info.offset)
6596 state |= (1 << MD_SB_BITMAP_PRESENT);
6598 if (mddev->major_version != info->major_version ||
6599 mddev->minor_version != info->minor_version ||
6600 /* mddev->patch_version != info->patch_version || */
6601 mddev->ctime != info->ctime ||
6602 mddev->level != info->level ||
6603 /* mddev->layout != info->layout || */
6604 mddev->persistent != !info->not_persistent ||
6605 mddev->chunk_sectors != info->chunk_size >> 9 ||
6606 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6607 ((state^info->state) & 0xfffffe00)
6610 /* Check there is only one change */
6611 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6613 if (mddev->raid_disks != info->raid_disks)
6615 if (mddev->layout != info->layout)
6617 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6624 if (mddev->layout != info->layout) {
6626 * we don't need to do anything at the md level, the
6627 * personality will take care of it all.
6629 if (mddev->pers->check_reshape == NULL)
6632 mddev->new_layout = info->layout;
6633 rv = mddev->pers->check_reshape(mddev);
6635 mddev->new_layout = mddev->layout;
6639 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6640 rv = update_size(mddev, (sector_t)info->size * 2);
6642 if (mddev->raid_disks != info->raid_disks)
6643 rv = update_raid_disks(mddev, info->raid_disks);
6645 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6646 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6650 if (mddev->recovery || mddev->sync_thread) {
6654 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6655 struct bitmap *bitmap;
6656 /* add the bitmap */
6657 if (mddev->bitmap) {
6661 if (mddev->bitmap_info.default_offset == 0) {
6665 mddev->bitmap_info.offset =
6666 mddev->bitmap_info.default_offset;
6667 mddev->bitmap_info.space =
6668 mddev->bitmap_info.default_space;
6669 mddev->pers->quiesce(mddev, 1);
6670 bitmap = bitmap_create(mddev, -1);
6671 if (!IS_ERR(bitmap)) {
6672 mddev->bitmap = bitmap;
6673 rv = bitmap_load(mddev);
6675 rv = PTR_ERR(bitmap);
6677 bitmap_destroy(mddev);
6678 mddev->pers->quiesce(mddev, 0);
6680 /* remove the bitmap */
6681 if (!mddev->bitmap) {
6685 if (mddev->bitmap->storage.file) {
6689 if (mddev->bitmap_info.nodes) {
6690 /* hold PW on all the bitmap lock */
6691 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6692 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6694 md_cluster_ops->unlock_all_bitmaps(mddev);
6698 mddev->bitmap_info.nodes = 0;
6699 md_cluster_ops->leave(mddev);
6701 mddev->pers->quiesce(mddev, 1);
6702 bitmap_destroy(mddev);
6703 mddev->pers->quiesce(mddev, 0);
6704 mddev->bitmap_info.offset = 0;
6707 md_update_sb(mddev, 1);
6713 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6715 struct md_rdev *rdev;
6718 if (mddev->pers == NULL)
6722 rdev = find_rdev_rcu(mddev, dev);
6726 md_error(mddev, rdev);
6727 if (!test_bit(Faulty, &rdev->flags))
6735 * We have a problem here : there is no easy way to give a CHS
6736 * virtual geometry. We currently pretend that we have a 2 heads
6737 * 4 sectors (with a BIG number of cylinders...). This drives
6738 * dosfs just mad... ;-)
6740 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6742 struct mddev *mddev = bdev->bd_disk->private_data;
6746 geo->cylinders = mddev->array_sectors / 8;
6750 static inline bool md_ioctl_valid(unsigned int cmd)
6755 case GET_ARRAY_INFO:
6756 case GET_BITMAP_FILE:
6759 case HOT_REMOVE_DISK:
6762 case RESTART_ARRAY_RW:
6764 case SET_ARRAY_INFO:
6765 case SET_BITMAP_FILE:
6766 case SET_DISK_FAULTY:
6769 case CLUSTERED_DISK_NACK:
6776 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6777 unsigned int cmd, unsigned long arg)
6780 void __user *argp = (void __user *)arg;
6781 struct mddev *mddev = NULL;
6784 if (!md_ioctl_valid(cmd))
6789 case GET_ARRAY_INFO:
6793 if (!capable(CAP_SYS_ADMIN))
6798 * Commands dealing with the RAID driver but not any
6803 err = get_version(argp);
6809 autostart_arrays(arg);
6816 * Commands creating/starting a new array:
6819 mddev = bdev->bd_disk->private_data;
6826 /* Some actions do not requires the mutex */
6828 case GET_ARRAY_INFO:
6829 if (!mddev->raid_disks && !mddev->external)
6832 err = get_array_info(mddev, argp);
6836 if (!mddev->raid_disks && !mddev->external)
6839 err = get_disk_info(mddev, argp);
6842 case SET_DISK_FAULTY:
6843 err = set_disk_faulty(mddev, new_decode_dev(arg));
6846 case GET_BITMAP_FILE:
6847 err = get_bitmap_file(mddev, argp);
6852 if (cmd == ADD_NEW_DISK)
6853 /* need to ensure md_delayed_delete() has completed */
6854 flush_workqueue(md_misc_wq);
6856 if (cmd == HOT_REMOVE_DISK)
6857 /* need to ensure recovery thread has run */
6858 wait_event_interruptible_timeout(mddev->sb_wait,
6859 !test_bit(MD_RECOVERY_NEEDED,
6861 msecs_to_jiffies(5000));
6862 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6863 /* Need to flush page cache, and ensure no-one else opens
6866 mutex_lock(&mddev->open_mutex);
6867 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6868 mutex_unlock(&mddev->open_mutex);
6872 set_bit(MD_CLOSING, &mddev->flags);
6873 mutex_unlock(&mddev->open_mutex);
6874 sync_blockdev(bdev);
6876 err = mddev_lock(mddev);
6878 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
6883 if (cmd == SET_ARRAY_INFO) {
6884 mdu_array_info_t info;
6886 memset(&info, 0, sizeof(info));
6887 else if (copy_from_user(&info, argp, sizeof(info))) {
6892 err = update_array_info(mddev, &info);
6894 pr_warn("md: couldn't update array info. %d\n", err);
6899 if (!list_empty(&mddev->disks)) {
6900 pr_warn("md: array %s already has disks!\n", mdname(mddev));
6904 if (mddev->raid_disks) {
6905 pr_warn("md: array %s already initialised!\n", mdname(mddev));
6909 err = set_array_info(mddev, &info);
6911 pr_warn("md: couldn't set array info. %d\n", err);
6918 * Commands querying/configuring an existing array:
6920 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6921 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6922 if ((!mddev->raid_disks && !mddev->external)
6923 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6924 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6925 && cmd != GET_BITMAP_FILE) {
6931 * Commands even a read-only array can execute:
6934 case RESTART_ARRAY_RW:
6935 err = restart_array(mddev);
6939 err = do_md_stop(mddev, 0, bdev);
6943 err = md_set_readonly(mddev, bdev);
6946 case HOT_REMOVE_DISK:
6947 err = hot_remove_disk(mddev, new_decode_dev(arg));
6951 /* We can support ADD_NEW_DISK on read-only arrays
6952 * only if we are re-adding a preexisting device.
6953 * So require mddev->pers and MD_DISK_SYNC.
6956 mdu_disk_info_t info;
6957 if (copy_from_user(&info, argp, sizeof(info)))
6959 else if (!(info.state & (1<<MD_DISK_SYNC)))
6960 /* Need to clear read-only for this */
6963 err = add_new_disk(mddev, &info);
6969 if (get_user(ro, (int __user *)(arg))) {
6975 /* if the bdev is going readonly the value of mddev->ro
6976 * does not matter, no writes are coming
6981 /* are we are already prepared for writes? */
6985 /* transitioning to readauto need only happen for
6986 * arrays that call md_write_start
6989 err = restart_array(mddev);
6992 set_disk_ro(mddev->gendisk, 0);
6999 * The remaining ioctls are changing the state of the
7000 * superblock, so we do not allow them on read-only arrays.
7002 if (mddev->ro && mddev->pers) {
7003 if (mddev->ro == 2) {
7005 sysfs_notify_dirent_safe(mddev->sysfs_state);
7006 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7007 /* mddev_unlock will wake thread */
7008 /* If a device failed while we were read-only, we
7009 * need to make sure the metadata is updated now.
7011 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7012 mddev_unlock(mddev);
7013 wait_event(mddev->sb_wait,
7014 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7015 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7016 mddev_lock_nointr(mddev);
7027 mdu_disk_info_t info;
7028 if (copy_from_user(&info, argp, sizeof(info)))
7031 err = add_new_disk(mddev, &info);
7035 case CLUSTERED_DISK_NACK:
7036 if (mddev_is_clustered(mddev))
7037 md_cluster_ops->new_disk_ack(mddev, false);
7043 err = hot_add_disk(mddev, new_decode_dev(arg));
7047 err = do_md_run(mddev);
7050 case SET_BITMAP_FILE:
7051 err = set_bitmap_file(mddev, (int)arg);
7060 if (mddev->hold_active == UNTIL_IOCTL &&
7062 mddev->hold_active = 0;
7063 mddev_unlock(mddev);
7067 #ifdef CONFIG_COMPAT
7068 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7069 unsigned int cmd, unsigned long arg)
7072 case HOT_REMOVE_DISK:
7074 case SET_DISK_FAULTY:
7075 case SET_BITMAP_FILE:
7076 /* These take in integer arg, do not convert */
7079 arg = (unsigned long)compat_ptr(arg);
7083 return md_ioctl(bdev, mode, cmd, arg);
7085 #endif /* CONFIG_COMPAT */
7087 static int md_open(struct block_device *bdev, fmode_t mode)
7090 * Succeed if we can lock the mddev, which confirms that
7091 * it isn't being stopped right now.
7093 struct mddev *mddev = mddev_find(bdev->bd_dev);
7099 if (mddev->gendisk != bdev->bd_disk) {
7100 /* we are racing with mddev_put which is discarding this
7104 /* Wait until bdev->bd_disk is definitely gone */
7105 flush_workqueue(md_misc_wq);
7106 /* Then retry the open from the top */
7107 return -ERESTARTSYS;
7109 BUG_ON(mddev != bdev->bd_disk->private_data);
7111 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7114 if (test_bit(MD_CLOSING, &mddev->flags)) {
7115 mutex_unlock(&mddev->open_mutex);
7121 atomic_inc(&mddev->openers);
7122 mutex_unlock(&mddev->open_mutex);
7124 check_disk_change(bdev);
7131 static void md_release(struct gendisk *disk, fmode_t mode)
7133 struct mddev *mddev = disk->private_data;
7136 atomic_dec(&mddev->openers);
7140 static int md_media_changed(struct gendisk *disk)
7142 struct mddev *mddev = disk->private_data;
7144 return mddev->changed;
7147 static int md_revalidate(struct gendisk *disk)
7149 struct mddev *mddev = disk->private_data;
7154 static const struct block_device_operations md_fops =
7156 .owner = THIS_MODULE,
7158 .release = md_release,
7160 #ifdef CONFIG_COMPAT
7161 .compat_ioctl = md_compat_ioctl,
7163 .getgeo = md_getgeo,
7164 .media_changed = md_media_changed,
7165 .revalidate_disk= md_revalidate,
7168 static int md_thread(void *arg)
7170 struct md_thread *thread = arg;
7173 * md_thread is a 'system-thread', it's priority should be very
7174 * high. We avoid resource deadlocks individually in each
7175 * raid personality. (RAID5 does preallocation) We also use RR and
7176 * the very same RT priority as kswapd, thus we will never get
7177 * into a priority inversion deadlock.
7179 * we definitely have to have equal or higher priority than
7180 * bdflush, otherwise bdflush will deadlock if there are too
7181 * many dirty RAID5 blocks.
7184 allow_signal(SIGKILL);
7185 while (!kthread_should_stop()) {
7187 /* We need to wait INTERRUPTIBLE so that
7188 * we don't add to the load-average.
7189 * That means we need to be sure no signals are
7192 if (signal_pending(current))
7193 flush_signals(current);
7195 wait_event_interruptible_timeout
7197 test_bit(THREAD_WAKEUP, &thread->flags)
7198 || kthread_should_stop() || kthread_should_park(),
7201 clear_bit(THREAD_WAKEUP, &thread->flags);
7202 if (kthread_should_park())
7204 if (!kthread_should_stop())
7205 thread->run(thread);
7211 void md_wakeup_thread(struct md_thread *thread)
7214 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7215 set_bit(THREAD_WAKEUP, &thread->flags);
7216 wake_up(&thread->wqueue);
7219 EXPORT_SYMBOL(md_wakeup_thread);
7221 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7222 struct mddev *mddev, const char *name)
7224 struct md_thread *thread;
7226 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7230 init_waitqueue_head(&thread->wqueue);
7233 thread->mddev = mddev;
7234 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7235 thread->tsk = kthread_run(md_thread, thread,
7237 mdname(thread->mddev),
7239 if (IS_ERR(thread->tsk)) {
7245 EXPORT_SYMBOL(md_register_thread);
7247 void md_unregister_thread(struct md_thread **threadp)
7249 struct md_thread *thread = *threadp;
7252 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7253 /* Locking ensures that mddev_unlock does not wake_up a
7254 * non-existent thread
7256 spin_lock(&pers_lock);
7258 spin_unlock(&pers_lock);
7260 kthread_stop(thread->tsk);
7263 EXPORT_SYMBOL(md_unregister_thread);
7265 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7267 if (!rdev || test_bit(Faulty, &rdev->flags))
7270 if (!mddev->pers || !mddev->pers->error_handler)
7272 mddev->pers->error_handler(mddev,rdev);
7273 if (mddev->degraded)
7274 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7275 sysfs_notify_dirent_safe(rdev->sysfs_state);
7276 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7277 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7278 md_wakeup_thread(mddev->thread);
7279 if (mddev->event_work.func)
7280 queue_work(md_misc_wq, &mddev->event_work);
7281 md_new_event(mddev);
7283 EXPORT_SYMBOL(md_error);
7285 /* seq_file implementation /proc/mdstat */
7287 static void status_unused(struct seq_file *seq)
7290 struct md_rdev *rdev;
7292 seq_printf(seq, "unused devices: ");
7294 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7295 char b[BDEVNAME_SIZE];
7297 seq_printf(seq, "%s ",
7298 bdevname(rdev->bdev,b));
7301 seq_printf(seq, "<none>");
7303 seq_printf(seq, "\n");
7306 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7308 sector_t max_sectors, resync, res;
7309 unsigned long dt, db;
7312 unsigned int per_milli;
7314 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7315 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7316 max_sectors = mddev->resync_max_sectors;
7318 max_sectors = mddev->dev_sectors;
7320 resync = mddev->curr_resync;
7322 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7323 /* Still cleaning up */
7324 resync = max_sectors;
7326 resync -= atomic_read(&mddev->recovery_active);
7329 if (mddev->recovery_cp < MaxSector) {
7330 seq_printf(seq, "\tresync=PENDING");
7336 seq_printf(seq, "\tresync=DELAYED");
7340 WARN_ON(max_sectors == 0);
7341 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7342 * in a sector_t, and (max_sectors>>scale) will fit in a
7343 * u32, as those are the requirements for sector_div.
7344 * Thus 'scale' must be at least 10
7347 if (sizeof(sector_t) > sizeof(unsigned long)) {
7348 while ( max_sectors/2 > (1ULL<<(scale+32)))
7351 res = (resync>>scale)*1000;
7352 sector_div(res, (u32)((max_sectors>>scale)+1));
7356 int i, x = per_milli/50, y = 20-x;
7357 seq_printf(seq, "[");
7358 for (i = 0; i < x; i++)
7359 seq_printf(seq, "=");
7360 seq_printf(seq, ">");
7361 for (i = 0; i < y; i++)
7362 seq_printf(seq, ".");
7363 seq_printf(seq, "] ");
7365 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7366 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7368 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7370 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7371 "resync" : "recovery"))),
7372 per_milli/10, per_milli % 10,
7373 (unsigned long long) resync/2,
7374 (unsigned long long) max_sectors/2);
7377 * dt: time from mark until now
7378 * db: blocks written from mark until now
7379 * rt: remaining time
7381 * rt is a sector_t, so could be 32bit or 64bit.
7382 * So we divide before multiply in case it is 32bit and close
7384 * We scale the divisor (db) by 32 to avoid losing precision
7385 * near the end of resync when the number of remaining sectors
7387 * We then divide rt by 32 after multiplying by db to compensate.
7388 * The '+1' avoids division by zero if db is very small.
7390 dt = ((jiffies - mddev->resync_mark) / HZ);
7392 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7393 - mddev->resync_mark_cnt;
7395 rt = max_sectors - resync; /* number of remaining sectors */
7396 sector_div(rt, db/32+1);
7400 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7401 ((unsigned long)rt % 60)/6);
7403 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7407 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7409 struct list_head *tmp;
7411 struct mddev *mddev;
7419 spin_lock(&all_mddevs_lock);
7420 list_for_each(tmp,&all_mddevs)
7422 mddev = list_entry(tmp, struct mddev, all_mddevs);
7424 spin_unlock(&all_mddevs_lock);
7427 spin_unlock(&all_mddevs_lock);
7429 return (void*)2;/* tail */
7433 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7435 struct list_head *tmp;
7436 struct mddev *next_mddev, *mddev = v;
7442 spin_lock(&all_mddevs_lock);
7444 tmp = all_mddevs.next;
7446 tmp = mddev->all_mddevs.next;
7447 if (tmp != &all_mddevs)
7448 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7450 next_mddev = (void*)2;
7453 spin_unlock(&all_mddevs_lock);
7461 static void md_seq_stop(struct seq_file *seq, void *v)
7463 struct mddev *mddev = v;
7465 if (mddev && v != (void*)1 && v != (void*)2)
7469 static int md_seq_show(struct seq_file *seq, void *v)
7471 struct mddev *mddev = v;
7473 struct md_rdev *rdev;
7475 if (v == (void*)1) {
7476 struct md_personality *pers;
7477 seq_printf(seq, "Personalities : ");
7478 spin_lock(&pers_lock);
7479 list_for_each_entry(pers, &pers_list, list)
7480 seq_printf(seq, "[%s] ", pers->name);
7482 spin_unlock(&pers_lock);
7483 seq_printf(seq, "\n");
7484 seq->poll_event = atomic_read(&md_event_count);
7487 if (v == (void*)2) {
7492 spin_lock(&mddev->lock);
7493 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7494 seq_printf(seq, "%s : %sactive", mdname(mddev),
7495 mddev->pers ? "" : "in");
7498 seq_printf(seq, " (read-only)");
7500 seq_printf(seq, " (auto-read-only)");
7501 seq_printf(seq, " %s", mddev->pers->name);
7506 rdev_for_each_rcu(rdev, mddev) {
7507 char b[BDEVNAME_SIZE];
7508 seq_printf(seq, " %s[%d]",
7509 bdevname(rdev->bdev,b), rdev->desc_nr);
7510 if (test_bit(WriteMostly, &rdev->flags))
7511 seq_printf(seq, "(W)");
7512 if (test_bit(Journal, &rdev->flags))
7513 seq_printf(seq, "(J)");
7514 if (test_bit(Faulty, &rdev->flags)) {
7515 seq_printf(seq, "(F)");
7518 if (rdev->raid_disk < 0)
7519 seq_printf(seq, "(S)"); /* spare */
7520 if (test_bit(Replacement, &rdev->flags))
7521 seq_printf(seq, "(R)");
7522 sectors += rdev->sectors;
7526 if (!list_empty(&mddev->disks)) {
7528 seq_printf(seq, "\n %llu blocks",
7529 (unsigned long long)
7530 mddev->array_sectors / 2);
7532 seq_printf(seq, "\n %llu blocks",
7533 (unsigned long long)sectors / 2);
7535 if (mddev->persistent) {
7536 if (mddev->major_version != 0 ||
7537 mddev->minor_version != 90) {
7538 seq_printf(seq," super %d.%d",
7539 mddev->major_version,
7540 mddev->minor_version);
7542 } else if (mddev->external)
7543 seq_printf(seq, " super external:%s",
7544 mddev->metadata_type);
7546 seq_printf(seq, " super non-persistent");
7549 mddev->pers->status(seq, mddev);
7550 seq_printf(seq, "\n ");
7551 if (mddev->pers->sync_request) {
7552 if (status_resync(seq, mddev))
7553 seq_printf(seq, "\n ");
7556 seq_printf(seq, "\n ");
7558 bitmap_status(seq, mddev->bitmap);
7560 seq_printf(seq, "\n");
7562 spin_unlock(&mddev->lock);
7567 static const struct seq_operations md_seq_ops = {
7568 .start = md_seq_start,
7569 .next = md_seq_next,
7570 .stop = md_seq_stop,
7571 .show = md_seq_show,
7574 static int md_seq_open(struct inode *inode, struct file *file)
7576 struct seq_file *seq;
7579 error = seq_open(file, &md_seq_ops);
7583 seq = file->private_data;
7584 seq->poll_event = atomic_read(&md_event_count);
7588 static int md_unloading;
7589 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7591 struct seq_file *seq = filp->private_data;
7595 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7596 poll_wait(filp, &md_event_waiters, wait);
7598 /* always allow read */
7599 mask = POLLIN | POLLRDNORM;
7601 if (seq->poll_event != atomic_read(&md_event_count))
7602 mask |= POLLERR | POLLPRI;
7606 static const struct file_operations md_seq_fops = {
7607 .owner = THIS_MODULE,
7608 .open = md_seq_open,
7610 .llseek = seq_lseek,
7611 .release = seq_release_private,
7612 .poll = mdstat_poll,
7615 int register_md_personality(struct md_personality *p)
7617 pr_debug("md: %s personality registered for level %d\n",
7619 spin_lock(&pers_lock);
7620 list_add_tail(&p->list, &pers_list);
7621 spin_unlock(&pers_lock);
7624 EXPORT_SYMBOL(register_md_personality);
7626 int unregister_md_personality(struct md_personality *p)
7628 pr_debug("md: %s personality unregistered\n", p->name);
7629 spin_lock(&pers_lock);
7630 list_del_init(&p->list);
7631 spin_unlock(&pers_lock);
7634 EXPORT_SYMBOL(unregister_md_personality);
7636 int register_md_cluster_operations(struct md_cluster_operations *ops,
7637 struct module *module)
7640 spin_lock(&pers_lock);
7641 if (md_cluster_ops != NULL)
7644 md_cluster_ops = ops;
7645 md_cluster_mod = module;
7647 spin_unlock(&pers_lock);
7650 EXPORT_SYMBOL(register_md_cluster_operations);
7652 int unregister_md_cluster_operations(void)
7654 spin_lock(&pers_lock);
7655 md_cluster_ops = NULL;
7656 spin_unlock(&pers_lock);
7659 EXPORT_SYMBOL(unregister_md_cluster_operations);
7661 int md_setup_cluster(struct mddev *mddev, int nodes)
7663 if (!md_cluster_ops)
7664 request_module("md-cluster");
7665 spin_lock(&pers_lock);
7666 /* ensure module won't be unloaded */
7667 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7668 pr_warn("can't find md-cluster module or get it's reference.\n");
7669 spin_unlock(&pers_lock);
7672 spin_unlock(&pers_lock);
7674 return md_cluster_ops->join(mddev, nodes);
7677 void md_cluster_stop(struct mddev *mddev)
7679 if (!md_cluster_ops)
7681 md_cluster_ops->leave(mddev);
7682 module_put(md_cluster_mod);
7685 static int is_mddev_idle(struct mddev *mddev, int init)
7687 struct md_rdev *rdev;
7693 rdev_for_each_rcu(rdev, mddev) {
7694 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7695 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7696 (int)part_stat_read(&disk->part0, sectors[1]) -
7697 atomic_read(&disk->sync_io);
7698 /* sync IO will cause sync_io to increase before the disk_stats
7699 * as sync_io is counted when a request starts, and
7700 * disk_stats is counted when it completes.
7701 * So resync activity will cause curr_events to be smaller than
7702 * when there was no such activity.
7703 * non-sync IO will cause disk_stat to increase without
7704 * increasing sync_io so curr_events will (eventually)
7705 * be larger than it was before. Once it becomes
7706 * substantially larger, the test below will cause
7707 * the array to appear non-idle, and resync will slow
7709 * If there is a lot of outstanding resync activity when
7710 * we set last_event to curr_events, then all that activity
7711 * completing might cause the array to appear non-idle
7712 * and resync will be slowed down even though there might
7713 * not have been non-resync activity. This will only
7714 * happen once though. 'last_events' will soon reflect
7715 * the state where there is little or no outstanding
7716 * resync requests, and further resync activity will
7717 * always make curr_events less than last_events.
7720 if (init || curr_events - rdev->last_events > 64) {
7721 rdev->last_events = curr_events;
7729 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7731 /* another "blocks" (512byte) blocks have been synced */
7732 atomic_sub(blocks, &mddev->recovery_active);
7733 wake_up(&mddev->recovery_wait);
7735 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7736 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7737 md_wakeup_thread(mddev->thread);
7738 // stop recovery, signal do_sync ....
7741 EXPORT_SYMBOL(md_done_sync);
7743 /* md_write_start(mddev, bi)
7744 * If we need to update some array metadata (e.g. 'active' flag
7745 * in superblock) before writing, schedule a superblock update
7746 * and wait for it to complete.
7748 void md_write_start(struct mddev *mddev, struct bio *bi)
7751 if (bio_data_dir(bi) != WRITE)
7754 BUG_ON(mddev->ro == 1);
7755 if (mddev->ro == 2) {
7756 /* need to switch to read/write */
7758 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7759 md_wakeup_thread(mddev->thread);
7760 md_wakeup_thread(mddev->sync_thread);
7763 atomic_inc(&mddev->writes_pending);
7764 if (mddev->safemode == 1)
7765 mddev->safemode = 0;
7766 if (mddev->in_sync) {
7767 spin_lock(&mddev->lock);
7768 if (mddev->in_sync) {
7770 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
7771 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
7772 md_wakeup_thread(mddev->thread);
7775 spin_unlock(&mddev->lock);
7778 sysfs_notify_dirent_safe(mddev->sysfs_state);
7779 wait_event(mddev->sb_wait,
7780 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7782 EXPORT_SYMBOL(md_write_start);
7784 void md_write_end(struct mddev *mddev)
7786 if (atomic_dec_and_test(&mddev->writes_pending)) {
7787 if (mddev->safemode == 2)
7788 md_wakeup_thread(mddev->thread);
7789 else if (mddev->safemode_delay)
7790 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7793 EXPORT_SYMBOL(md_write_end);
7795 /* md_allow_write(mddev)
7796 * Calling this ensures that the array is marked 'active' so that writes
7797 * may proceed without blocking. It is important to call this before
7798 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7799 * Must be called with mddev_lock held.
7801 * In the ->external case MD_SB_CHANGE_PENDING can not be cleared until mddev->lock
7802 * is dropped, so return -EAGAIN after notifying userspace.
7804 int md_allow_write(struct mddev *mddev)
7810 if (!mddev->pers->sync_request)
7813 spin_lock(&mddev->lock);
7814 if (mddev->in_sync) {
7816 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
7817 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
7818 if (mddev->safemode_delay &&
7819 mddev->safemode == 0)
7820 mddev->safemode = 1;
7821 spin_unlock(&mddev->lock);
7822 md_update_sb(mddev, 0);
7823 sysfs_notify_dirent_safe(mddev->sysfs_state);
7825 spin_unlock(&mddev->lock);
7827 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
7832 EXPORT_SYMBOL_GPL(md_allow_write);
7834 #define SYNC_MARKS 10
7835 #define SYNC_MARK_STEP (3*HZ)
7836 #define UPDATE_FREQUENCY (5*60*HZ)
7837 void md_do_sync(struct md_thread *thread)
7839 struct mddev *mddev = thread->mddev;
7840 struct mddev *mddev2;
7841 unsigned int currspeed = 0,
7843 sector_t max_sectors,j, io_sectors, recovery_done;
7844 unsigned long mark[SYNC_MARKS];
7845 unsigned long update_time;
7846 sector_t mark_cnt[SYNC_MARKS];
7848 struct list_head *tmp;
7849 sector_t last_check;
7851 struct md_rdev *rdev;
7852 char *desc, *action = NULL;
7853 struct blk_plug plug;
7856 /* just incase thread restarts... */
7857 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7859 if (mddev->ro) {/* never try to sync a read-only array */
7860 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7864 if (mddev_is_clustered(mddev)) {
7865 ret = md_cluster_ops->resync_start(mddev);
7869 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
7870 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7871 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
7872 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
7873 && ((unsigned long long)mddev->curr_resync_completed
7874 < (unsigned long long)mddev->resync_max_sectors))
7878 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7879 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7880 desc = "data-check";
7882 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7883 desc = "requested-resync";
7887 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7892 mddev->last_sync_action = action ?: desc;
7894 /* we overload curr_resync somewhat here.
7895 * 0 == not engaged in resync at all
7896 * 2 == checking that there is no conflict with another sync
7897 * 1 == like 2, but have yielded to allow conflicting resync to
7899 * other == active in resync - this many blocks
7901 * Before starting a resync we must have set curr_resync to
7902 * 2, and then checked that every "conflicting" array has curr_resync
7903 * less than ours. When we find one that is the same or higher
7904 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7905 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7906 * This will mean we have to start checking from the beginning again.
7911 int mddev2_minor = -1;
7912 mddev->curr_resync = 2;
7915 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7917 for_each_mddev(mddev2, tmp) {
7918 if (mddev2 == mddev)
7920 if (!mddev->parallel_resync
7921 && mddev2->curr_resync
7922 && match_mddev_units(mddev, mddev2)) {
7924 if (mddev < mddev2 && mddev->curr_resync == 2) {
7925 /* arbitrarily yield */
7926 mddev->curr_resync = 1;
7927 wake_up(&resync_wait);
7929 if (mddev > mddev2 && mddev->curr_resync == 1)
7930 /* no need to wait here, we can wait the next
7931 * time 'round when curr_resync == 2
7934 /* We need to wait 'interruptible' so as not to
7935 * contribute to the load average, and not to
7936 * be caught by 'softlockup'
7938 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7939 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7940 mddev2->curr_resync >= mddev->curr_resync) {
7941 if (mddev2_minor != mddev2->md_minor) {
7942 mddev2_minor = mddev2->md_minor;
7943 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
7944 desc, mdname(mddev),
7948 if (signal_pending(current))
7949 flush_signals(current);
7951 finish_wait(&resync_wait, &wq);
7954 finish_wait(&resync_wait, &wq);
7957 } while (mddev->curr_resync < 2);
7960 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7961 /* resync follows the size requested by the personality,
7962 * which defaults to physical size, but can be virtual size
7964 max_sectors = mddev->resync_max_sectors;
7965 atomic64_set(&mddev->resync_mismatches, 0);
7966 /* we don't use the checkpoint if there's a bitmap */
7967 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7968 j = mddev->resync_min;
7969 else if (!mddev->bitmap)
7970 j = mddev->recovery_cp;
7972 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7973 max_sectors = mddev->resync_max_sectors;
7975 /* recovery follows the physical size of devices */
7976 max_sectors = mddev->dev_sectors;
7979 rdev_for_each_rcu(rdev, mddev)
7980 if (rdev->raid_disk >= 0 &&
7981 !test_bit(Journal, &rdev->flags) &&
7982 !test_bit(Faulty, &rdev->flags) &&
7983 !test_bit(In_sync, &rdev->flags) &&
7984 rdev->recovery_offset < j)
7985 j = rdev->recovery_offset;
7988 /* If there is a bitmap, we need to make sure all
7989 * writes that started before we added a spare
7990 * complete before we start doing a recovery.
7991 * Otherwise the write might complete and (via
7992 * bitmap_endwrite) set a bit in the bitmap after the
7993 * recovery has checked that bit and skipped that
7996 if (mddev->bitmap) {
7997 mddev->pers->quiesce(mddev, 1);
7998 mddev->pers->quiesce(mddev, 0);
8002 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8003 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8004 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8005 speed_max(mddev), desc);
8007 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8010 for (m = 0; m < SYNC_MARKS; m++) {
8012 mark_cnt[m] = io_sectors;
8015 mddev->resync_mark = mark[last_mark];
8016 mddev->resync_mark_cnt = mark_cnt[last_mark];
8019 * Tune reconstruction:
8021 window = 32*(PAGE_SIZE/512);
8022 pr_debug("md: using %dk window, over a total of %lluk.\n",
8023 window/2, (unsigned long long)max_sectors/2);
8025 atomic_set(&mddev->recovery_active, 0);
8029 pr_debug("md: resuming %s of %s from checkpoint.\n",
8030 desc, mdname(mddev));
8031 mddev->curr_resync = j;
8033 mddev->curr_resync = 3; /* no longer delayed */
8034 mddev->curr_resync_completed = j;
8035 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8036 md_new_event(mddev);
8037 update_time = jiffies;
8039 blk_start_plug(&plug);
8040 while (j < max_sectors) {
8045 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8046 ((mddev->curr_resync > mddev->curr_resync_completed &&
8047 (mddev->curr_resync - mddev->curr_resync_completed)
8048 > (max_sectors >> 4)) ||
8049 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8050 (j - mddev->curr_resync_completed)*2
8051 >= mddev->resync_max - mddev->curr_resync_completed ||
8052 mddev->curr_resync_completed > mddev->resync_max
8054 /* time to update curr_resync_completed */
8055 wait_event(mddev->recovery_wait,
8056 atomic_read(&mddev->recovery_active) == 0);
8057 mddev->curr_resync_completed = j;
8058 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8059 j > mddev->recovery_cp)
8060 mddev->recovery_cp = j;
8061 update_time = jiffies;
8062 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8063 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8066 while (j >= mddev->resync_max &&
8067 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8068 /* As this condition is controlled by user-space,
8069 * we can block indefinitely, so use '_interruptible'
8070 * to avoid triggering warnings.
8072 flush_signals(current); /* just in case */
8073 wait_event_interruptible(mddev->recovery_wait,
8074 mddev->resync_max > j
8075 || test_bit(MD_RECOVERY_INTR,
8079 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8082 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8084 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8088 if (!skipped) { /* actual IO requested */
8089 io_sectors += sectors;
8090 atomic_add(sectors, &mddev->recovery_active);
8093 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8097 if (j > max_sectors)
8098 /* when skipping, extra large numbers can be returned. */
8101 mddev->curr_resync = j;
8102 mddev->curr_mark_cnt = io_sectors;
8103 if (last_check == 0)
8104 /* this is the earliest that rebuild will be
8105 * visible in /proc/mdstat
8107 md_new_event(mddev);
8109 if (last_check + window > io_sectors || j == max_sectors)
8112 last_check = io_sectors;
8114 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8116 int next = (last_mark+1) % SYNC_MARKS;
8118 mddev->resync_mark = mark[next];
8119 mddev->resync_mark_cnt = mark_cnt[next];
8120 mark[next] = jiffies;
8121 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8125 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8129 * this loop exits only if either when we are slower than
8130 * the 'hard' speed limit, or the system was IO-idle for
8132 * the system might be non-idle CPU-wise, but we only care
8133 * about not overloading the IO subsystem. (things like an
8134 * e2fsck being done on the RAID array should execute fast)
8138 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8139 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8140 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8142 if (currspeed > speed_min(mddev)) {
8143 if (currspeed > speed_max(mddev)) {
8147 if (!is_mddev_idle(mddev, 0)) {
8149 * Give other IO more of a chance.
8150 * The faster the devices, the less we wait.
8152 wait_event(mddev->recovery_wait,
8153 !atomic_read(&mddev->recovery_active));
8157 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8158 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8159 ? "interrupted" : "done");
8161 * this also signals 'finished resyncing' to md_stop
8163 blk_finish_plug(&plug);
8164 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8166 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8167 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8168 mddev->curr_resync > 3) {
8169 mddev->curr_resync_completed = mddev->curr_resync;
8170 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8172 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8174 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8175 mddev->curr_resync > 3) {
8176 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8177 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8178 if (mddev->curr_resync >= mddev->recovery_cp) {
8179 pr_debug("md: checkpointing %s of %s.\n",
8180 desc, mdname(mddev));
8181 if (test_bit(MD_RECOVERY_ERROR,
8183 mddev->recovery_cp =
8184 mddev->curr_resync_completed;
8186 mddev->recovery_cp =
8190 mddev->recovery_cp = MaxSector;
8192 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8193 mddev->curr_resync = MaxSector;
8195 rdev_for_each_rcu(rdev, mddev)
8196 if (rdev->raid_disk >= 0 &&
8197 mddev->delta_disks >= 0 &&
8198 !test_bit(Journal, &rdev->flags) &&
8199 !test_bit(Faulty, &rdev->flags) &&
8200 !test_bit(In_sync, &rdev->flags) &&
8201 rdev->recovery_offset < mddev->curr_resync)
8202 rdev->recovery_offset = mddev->curr_resync;
8207 /* set CHANGE_PENDING here since maybe another update is needed,
8208 * so other nodes are informed. It should be harmless for normal
8210 set_mask_bits(&mddev->sb_flags, 0,
8211 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8213 spin_lock(&mddev->lock);
8214 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8215 /* We completed so min/max setting can be forgotten if used. */
8216 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8217 mddev->resync_min = 0;
8218 mddev->resync_max = MaxSector;
8219 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8220 mddev->resync_min = mddev->curr_resync_completed;
8221 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8222 mddev->curr_resync = 0;
8223 spin_unlock(&mddev->lock);
8225 wake_up(&resync_wait);
8226 md_wakeup_thread(mddev->thread);
8229 EXPORT_SYMBOL_GPL(md_do_sync);
8231 static int remove_and_add_spares(struct mddev *mddev,
8232 struct md_rdev *this)
8234 struct md_rdev *rdev;
8237 bool remove_some = false;
8239 rdev_for_each(rdev, mddev) {
8240 if ((this == NULL || rdev == this) &&
8241 rdev->raid_disk >= 0 &&
8242 !test_bit(Blocked, &rdev->flags) &&
8243 test_bit(Faulty, &rdev->flags) &&
8244 atomic_read(&rdev->nr_pending)==0) {
8245 /* Faulty non-Blocked devices with nr_pending == 0
8246 * never get nr_pending incremented,
8247 * never get Faulty cleared, and never get Blocked set.
8248 * So we can synchronize_rcu now rather than once per device
8251 set_bit(RemoveSynchronized, &rdev->flags);
8257 rdev_for_each(rdev, mddev) {
8258 if ((this == NULL || rdev == this) &&
8259 rdev->raid_disk >= 0 &&
8260 !test_bit(Blocked, &rdev->flags) &&
8261 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8262 (!test_bit(In_sync, &rdev->flags) &&
8263 !test_bit(Journal, &rdev->flags))) &&
8264 atomic_read(&rdev->nr_pending)==0)) {
8265 if (mddev->pers->hot_remove_disk(
8266 mddev, rdev) == 0) {
8267 sysfs_unlink_rdev(mddev, rdev);
8268 rdev->raid_disk = -1;
8272 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8273 clear_bit(RemoveSynchronized, &rdev->flags);
8276 if (removed && mddev->kobj.sd)
8277 sysfs_notify(&mddev->kobj, NULL, "degraded");
8279 if (this && removed)
8282 rdev_for_each(rdev, mddev) {
8283 if (this && this != rdev)
8285 if (test_bit(Candidate, &rdev->flags))
8287 if (rdev->raid_disk >= 0 &&
8288 !test_bit(In_sync, &rdev->flags) &&
8289 !test_bit(Journal, &rdev->flags) &&
8290 !test_bit(Faulty, &rdev->flags))
8292 if (rdev->raid_disk >= 0)
8294 if (test_bit(Faulty, &rdev->flags))
8296 if (!test_bit(Journal, &rdev->flags)) {
8298 ! (rdev->saved_raid_disk >= 0 &&
8299 !test_bit(Bitmap_sync, &rdev->flags)))
8302 rdev->recovery_offset = 0;
8305 hot_add_disk(mddev, rdev) == 0) {
8306 if (sysfs_link_rdev(mddev, rdev))
8307 /* failure here is OK */;
8308 if (!test_bit(Journal, &rdev->flags))
8310 md_new_event(mddev);
8311 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8316 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8320 static void md_start_sync(struct work_struct *ws)
8322 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8324 mddev->sync_thread = md_register_thread(md_do_sync,
8327 if (!mddev->sync_thread) {
8328 pr_warn("%s: could not start resync thread...\n",
8330 /* leave the spares where they are, it shouldn't hurt */
8331 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8332 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8333 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8334 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8335 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8336 wake_up(&resync_wait);
8337 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8339 if (mddev->sysfs_action)
8340 sysfs_notify_dirent_safe(mddev->sysfs_action);
8342 md_wakeup_thread(mddev->sync_thread);
8343 sysfs_notify_dirent_safe(mddev->sysfs_action);
8344 md_new_event(mddev);
8348 * This routine is regularly called by all per-raid-array threads to
8349 * deal with generic issues like resync and super-block update.
8350 * Raid personalities that don't have a thread (linear/raid0) do not
8351 * need this as they never do any recovery or update the superblock.
8353 * It does not do any resync itself, but rather "forks" off other threads
8354 * to do that as needed.
8355 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8356 * "->recovery" and create a thread at ->sync_thread.
8357 * When the thread finishes it sets MD_RECOVERY_DONE
8358 * and wakeups up this thread which will reap the thread and finish up.
8359 * This thread also removes any faulty devices (with nr_pending == 0).
8361 * The overall approach is:
8362 * 1/ if the superblock needs updating, update it.
8363 * 2/ If a recovery thread is running, don't do anything else.
8364 * 3/ If recovery has finished, clean up, possibly marking spares active.
8365 * 4/ If there are any faulty devices, remove them.
8366 * 5/ If array is degraded, try to add spares devices
8367 * 6/ If array has spares or is not in-sync, start a resync thread.
8369 void md_check_recovery(struct mddev *mddev)
8371 if (mddev->suspended)
8375 bitmap_daemon_work(mddev);
8377 if (signal_pending(current)) {
8378 if (mddev->pers->sync_request && !mddev->external) {
8379 pr_debug("md: %s in immediate safe mode\n",
8381 mddev->safemode = 2;
8383 flush_signals(current);
8386 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8389 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8390 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8391 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8392 test_bit(MD_RELOAD_SB, &mddev->flags) ||
8393 (mddev->external == 0 && mddev->safemode == 1) ||
8394 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8395 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8399 if (mddev_trylock(mddev)) {
8403 struct md_rdev *rdev;
8404 if (!mddev->external && mddev->in_sync)
8405 /* 'Blocked' flag not needed as failed devices
8406 * will be recorded if array switched to read/write.
8407 * Leaving it set will prevent the device
8408 * from being removed.
8410 rdev_for_each(rdev, mddev)
8411 clear_bit(Blocked, &rdev->flags);
8412 /* On a read-only array we can:
8413 * - remove failed devices
8414 * - add already-in_sync devices if the array itself
8416 * As we only add devices that are already in-sync,
8417 * we can activate the spares immediately.
8419 remove_and_add_spares(mddev, NULL);
8420 /* There is no thread, but we need to call
8421 * ->spare_active and clear saved_raid_disk
8423 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8424 md_reap_sync_thread(mddev);
8425 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8426 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8427 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8431 if (mddev_is_clustered(mddev)) {
8432 struct md_rdev *rdev;
8433 /* kick the device if another node issued a
8436 rdev_for_each(rdev, mddev) {
8437 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8438 rdev->raid_disk < 0)
8439 md_kick_rdev_from_array(rdev);
8442 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8443 md_reload_sb(mddev, mddev->good_device_nr);
8446 if (!mddev->external) {
8448 spin_lock(&mddev->lock);
8449 if (mddev->safemode &&
8450 !atomic_read(&mddev->writes_pending) &&
8452 mddev->recovery_cp == MaxSector) {
8455 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8457 if (mddev->safemode == 1)
8458 mddev->safemode = 0;
8459 spin_unlock(&mddev->lock);
8461 sysfs_notify_dirent_safe(mddev->sysfs_state);
8464 if (mddev->sb_flags)
8465 md_update_sb(mddev, 0);
8467 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8468 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8469 /* resync/recovery still happening */
8470 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8473 if (mddev->sync_thread) {
8474 md_reap_sync_thread(mddev);
8477 /* Set RUNNING before clearing NEEDED to avoid
8478 * any transients in the value of "sync_action".
8480 mddev->curr_resync_completed = 0;
8481 spin_lock(&mddev->lock);
8482 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8483 spin_unlock(&mddev->lock);
8484 /* Clear some bits that don't mean anything, but
8487 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8488 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8490 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8491 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8493 /* no recovery is running.
8494 * remove any failed drives, then
8495 * add spares if possible.
8496 * Spares are also removed and re-added, to allow
8497 * the personality to fail the re-add.
8500 if (mddev->reshape_position != MaxSector) {
8501 if (mddev->pers->check_reshape == NULL ||
8502 mddev->pers->check_reshape(mddev) != 0)
8503 /* Cannot proceed */
8505 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8506 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8507 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8508 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8509 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8510 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8511 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8512 } else if (mddev->recovery_cp < MaxSector) {
8513 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8514 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8515 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8516 /* nothing to be done ... */
8519 if (mddev->pers->sync_request) {
8521 /* We are adding a device or devices to an array
8522 * which has the bitmap stored on all devices.
8523 * So make sure all bitmap pages get written
8525 bitmap_write_all(mddev->bitmap);
8527 INIT_WORK(&mddev->del_work, md_start_sync);
8528 queue_work(md_misc_wq, &mddev->del_work);
8532 if (!mddev->sync_thread) {
8533 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8534 wake_up(&resync_wait);
8535 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8537 if (mddev->sysfs_action)
8538 sysfs_notify_dirent_safe(mddev->sysfs_action);
8541 wake_up(&mddev->sb_wait);
8542 mddev_unlock(mddev);
8545 EXPORT_SYMBOL(md_check_recovery);
8547 void md_reap_sync_thread(struct mddev *mddev)
8549 struct md_rdev *rdev;
8551 /* resync has finished, collect result */
8552 md_unregister_thread(&mddev->sync_thread);
8553 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8554 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8556 /* activate any spares */
8557 if (mddev->pers->spare_active(mddev)) {
8558 sysfs_notify(&mddev->kobj, NULL,
8560 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8563 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8564 mddev->pers->finish_reshape)
8565 mddev->pers->finish_reshape(mddev);
8567 /* If array is no-longer degraded, then any saved_raid_disk
8568 * information must be scrapped.
8570 if (!mddev->degraded)
8571 rdev_for_each(rdev, mddev)
8572 rdev->saved_raid_disk = -1;
8574 md_update_sb(mddev, 1);
8575 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8576 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8578 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8579 md_cluster_ops->resync_finish(mddev);
8580 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8581 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8582 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8583 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8584 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8585 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8586 wake_up(&resync_wait);
8587 /* flag recovery needed just to double check */
8588 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8589 sysfs_notify_dirent_safe(mddev->sysfs_action);
8590 md_new_event(mddev);
8591 if (mddev->event_work.func)
8592 queue_work(md_misc_wq, &mddev->event_work);
8594 EXPORT_SYMBOL(md_reap_sync_thread);
8596 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8598 sysfs_notify_dirent_safe(rdev->sysfs_state);
8599 wait_event_timeout(rdev->blocked_wait,
8600 !test_bit(Blocked, &rdev->flags) &&
8601 !test_bit(BlockedBadBlocks, &rdev->flags),
8602 msecs_to_jiffies(5000));
8603 rdev_dec_pending(rdev, mddev);
8605 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8607 void md_finish_reshape(struct mddev *mddev)
8609 /* called be personality module when reshape completes. */
8610 struct md_rdev *rdev;
8612 rdev_for_each(rdev, mddev) {
8613 if (rdev->data_offset > rdev->new_data_offset)
8614 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8616 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8617 rdev->data_offset = rdev->new_data_offset;
8620 EXPORT_SYMBOL(md_finish_reshape);
8622 /* Bad block management */
8624 /* Returns 1 on success, 0 on failure */
8625 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8628 struct mddev *mddev = rdev->mddev;
8631 s += rdev->new_data_offset;
8633 s += rdev->data_offset;
8634 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8636 /* Make sure they get written out promptly */
8637 if (test_bit(ExternalBbl, &rdev->flags))
8638 sysfs_notify(&rdev->kobj, NULL,
8639 "unacknowledged_bad_blocks");
8640 sysfs_notify_dirent_safe(rdev->sysfs_state);
8641 set_mask_bits(&mddev->sb_flags, 0,
8642 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
8643 md_wakeup_thread(rdev->mddev->thread);
8648 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8650 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8655 s += rdev->new_data_offset;
8657 s += rdev->data_offset;
8658 rv = badblocks_clear(&rdev->badblocks, s, sectors);
8659 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
8660 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
8663 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8665 static int md_notify_reboot(struct notifier_block *this,
8666 unsigned long code, void *x)
8668 struct list_head *tmp;
8669 struct mddev *mddev;
8672 for_each_mddev(mddev, tmp) {
8673 if (mddev_trylock(mddev)) {
8675 __md_stop_writes(mddev);
8676 if (mddev->persistent)
8677 mddev->safemode = 2;
8678 mddev_unlock(mddev);
8683 * certain more exotic SCSI devices are known to be
8684 * volatile wrt too early system reboots. While the
8685 * right place to handle this issue is the given
8686 * driver, we do want to have a safe RAID driver ...
8694 static struct notifier_block md_notifier = {
8695 .notifier_call = md_notify_reboot,
8697 .priority = INT_MAX, /* before any real devices */
8700 static void md_geninit(void)
8702 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8704 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8707 static int __init md_init(void)
8711 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8715 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8719 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8722 if ((ret = register_blkdev(0, "mdp")) < 0)
8726 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8727 md_probe, NULL, NULL);
8728 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8729 md_probe, NULL, NULL);
8731 register_reboot_notifier(&md_notifier);
8732 raid_table_header = register_sysctl_table(raid_root_table);
8738 unregister_blkdev(MD_MAJOR, "md");
8740 destroy_workqueue(md_misc_wq);
8742 destroy_workqueue(md_wq);
8747 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8749 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8750 struct md_rdev *rdev2;
8752 char b[BDEVNAME_SIZE];
8754 /* Check for change of roles in the active devices */
8755 rdev_for_each(rdev2, mddev) {
8756 if (test_bit(Faulty, &rdev2->flags))
8759 /* Check if the roles changed */
8760 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8762 if (test_bit(Candidate, &rdev2->flags)) {
8763 if (role == 0xfffe) {
8764 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8765 md_kick_rdev_from_array(rdev2);
8769 clear_bit(Candidate, &rdev2->flags);
8772 if (role != rdev2->raid_disk) {
8774 if (rdev2->raid_disk == -1 && role != 0xffff) {
8775 rdev2->saved_raid_disk = role;
8776 ret = remove_and_add_spares(mddev, rdev2);
8777 pr_info("Activated spare: %s\n",
8778 bdevname(rdev2->bdev,b));
8779 /* wakeup mddev->thread here, so array could
8780 * perform resync with the new activated disk */
8781 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8782 md_wakeup_thread(mddev->thread);
8786 * We just want to do the minimum to mark the disk
8787 * as faulty. The recovery is performed by the
8788 * one who initiated the error.
8790 if ((role == 0xfffe) || (role == 0xfffd)) {
8791 md_error(mddev, rdev2);
8792 clear_bit(Blocked, &rdev2->flags);
8797 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8798 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8800 /* Finally set the event to be up to date */
8801 mddev->events = le64_to_cpu(sb->events);
8804 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8807 struct page *swapout = rdev->sb_page;
8808 struct mdp_superblock_1 *sb;
8810 /* Store the sb page of the rdev in the swapout temporary
8811 * variable in case we err in the future
8813 rdev->sb_page = NULL;
8814 err = alloc_disk_sb(rdev);
8816 ClearPageUptodate(rdev->sb_page);
8817 rdev->sb_loaded = 0;
8818 err = super_types[mddev->major_version].
8819 load_super(rdev, NULL, mddev->minor_version);
8822 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8823 __func__, __LINE__, rdev->desc_nr, err);
8825 put_page(rdev->sb_page);
8826 rdev->sb_page = swapout;
8827 rdev->sb_loaded = 1;
8831 sb = page_address(rdev->sb_page);
8832 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8836 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8837 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8839 /* The other node finished recovery, call spare_active to set
8840 * device In_sync and mddev->degraded
8842 if (rdev->recovery_offset == MaxSector &&
8843 !test_bit(In_sync, &rdev->flags) &&
8844 mddev->pers->spare_active(mddev))
8845 sysfs_notify(&mddev->kobj, NULL, "degraded");
8851 void md_reload_sb(struct mddev *mddev, int nr)
8853 struct md_rdev *rdev;
8857 rdev_for_each_rcu(rdev, mddev) {
8858 if (rdev->desc_nr == nr)
8862 if (!rdev || rdev->desc_nr != nr) {
8863 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8867 err = read_rdev(mddev, rdev);
8871 check_sb_changes(mddev, rdev);
8873 /* Read all rdev's to update recovery_offset */
8874 rdev_for_each_rcu(rdev, mddev)
8875 read_rdev(mddev, rdev);
8877 EXPORT_SYMBOL(md_reload_sb);
8882 * Searches all registered partitions for autorun RAID arrays
8886 static DEFINE_MUTEX(detected_devices_mutex);
8887 static LIST_HEAD(all_detected_devices);
8888 struct detected_devices_node {
8889 struct list_head list;
8893 void md_autodetect_dev(dev_t dev)
8895 struct detected_devices_node *node_detected_dev;
8897 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8898 if (node_detected_dev) {
8899 node_detected_dev->dev = dev;
8900 mutex_lock(&detected_devices_mutex);
8901 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8902 mutex_unlock(&detected_devices_mutex);
8906 static void autostart_arrays(int part)
8908 struct md_rdev *rdev;
8909 struct detected_devices_node *node_detected_dev;
8911 int i_scanned, i_passed;
8916 pr_info("md: Autodetecting RAID arrays.\n");
8918 mutex_lock(&detected_devices_mutex);
8919 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8921 node_detected_dev = list_entry(all_detected_devices.next,
8922 struct detected_devices_node, list);
8923 list_del(&node_detected_dev->list);
8924 dev = node_detected_dev->dev;
8925 kfree(node_detected_dev);
8926 mutex_unlock(&detected_devices_mutex);
8927 rdev = md_import_device(dev,0, 90);
8928 mutex_lock(&detected_devices_mutex);
8932 if (test_bit(Faulty, &rdev->flags))
8935 set_bit(AutoDetected, &rdev->flags);
8936 list_add(&rdev->same_set, &pending_raid_disks);
8939 mutex_unlock(&detected_devices_mutex);
8941 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
8943 autorun_devices(part);
8946 #endif /* !MODULE */
8948 static __exit void md_exit(void)
8950 struct mddev *mddev;
8951 struct list_head *tmp;
8954 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8955 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8957 unregister_blkdev(MD_MAJOR,"md");
8958 unregister_blkdev(mdp_major, "mdp");
8959 unregister_reboot_notifier(&md_notifier);
8960 unregister_sysctl_table(raid_table_header);
8962 /* We cannot unload the modules while some process is
8963 * waiting for us in select() or poll() - wake them up
8966 while (waitqueue_active(&md_event_waiters)) {
8967 /* not safe to leave yet */
8968 wake_up(&md_event_waiters);
8972 remove_proc_entry("mdstat", NULL);
8974 for_each_mddev(mddev, tmp) {
8975 export_array(mddev);
8977 mddev->hold_active = 0;
8979 * for_each_mddev() will call mddev_put() at the end of each
8980 * iteration. As the mddev is now fully clear, this will
8981 * schedule the mddev for destruction by a workqueue, and the
8982 * destroy_workqueue() below will wait for that to complete.
8985 destroy_workqueue(md_misc_wq);
8986 destroy_workqueue(md_wq);
8989 subsys_initcall(md_init);
8990 module_exit(md_exit)
8992 static int get_ro(char *buffer, struct kernel_param *kp)
8994 return sprintf(buffer, "%d", start_readonly);
8996 static int set_ro(const char *val, struct kernel_param *kp)
8998 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9001 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9002 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9003 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9005 MODULE_LICENSE("GPL");
9006 MODULE_DESCRIPTION("MD RAID framework");
9008 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);