1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/blk-integrity.h>
45 #include <linux/badblocks.h>
46 #include <linux/sysctl.h>
47 #include <linux/seq_file.h>
49 #include <linux/poll.h>
50 #include <linux/ctype.h>
51 #include <linux/string.h>
52 #include <linux/hdreg.h>
53 #include <linux/proc_fs.h>
54 #include <linux/random.h>
55 #include <linux/major.h>
56 #include <linux/module.h>
57 #include <linux/reboot.h>
58 #include <linux/file.h>
59 #include <linux/compat.h>
60 #include <linux/delay.h>
61 #include <linux/raid/md_p.h>
62 #include <linux/raid/md_u.h>
63 #include <linux/raid/detect.h>
64 #include <linux/slab.h>
65 #include <linux/percpu-refcount.h>
66 #include <linux/part_stat.h>
68 #include <trace/events/block.h>
70 #include "md-bitmap.h"
71 #include "md-cluster.h"
73 /* pers_list is a list of registered personalities protected by pers_lock. */
74 static LIST_HEAD(pers_list);
75 static DEFINE_SPINLOCK(pers_lock);
77 static const struct kobj_type md_ktype;
79 struct md_cluster_operations *md_cluster_ops;
80 EXPORT_SYMBOL(md_cluster_ops);
81 static struct module *md_cluster_mod;
83 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
84 static struct workqueue_struct *md_wq;
87 * This workqueue is used for sync_work to register new sync_thread, and for
88 * del_work to remove rdev, and for event_work that is only set by dm-raid.
90 * Noted that sync_work will grab reconfig_mutex, hence never flush this
91 * workqueue whith reconfig_mutex grabbed.
93 static struct workqueue_struct *md_misc_wq;
94 struct workqueue_struct *md_bitmap_wq;
96 static int remove_and_add_spares(struct mddev *mddev,
97 struct md_rdev *this);
98 static void mddev_detach(struct mddev *mddev);
99 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev);
100 static void md_wakeup_thread_directly(struct md_thread __rcu *thread);
109 static bool md_is_rdwr(struct mddev *mddev)
111 return (mddev->ro == MD_RDWR);
115 * Default number of read corrections we'll attempt on an rdev
116 * before ejecting it from the array. We divide the read error
117 * count by 2 for every hour elapsed between read errors.
119 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
120 /* Default safemode delay: 200 msec */
121 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
123 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
124 * is 1000 KB/sec, so the extra system load does not show up that much.
125 * Increase it if you want to have more _guaranteed_ speed. Note that
126 * the RAID driver will use the maximum available bandwidth if the IO
127 * subsystem is idle. There is also an 'absolute maximum' reconstruction
128 * speed limit - in case reconstruction slows down your system despite
131 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
132 * or /sys/block/mdX/md/sync_speed_{min,max}
135 static int sysctl_speed_limit_min = 1000;
136 static int sysctl_speed_limit_max = 200000;
137 static inline int speed_min(struct mddev *mddev)
139 return mddev->sync_speed_min ?
140 mddev->sync_speed_min : sysctl_speed_limit_min;
143 static inline int speed_max(struct mddev *mddev)
145 return mddev->sync_speed_max ?
146 mddev->sync_speed_max : sysctl_speed_limit_max;
149 static void rdev_uninit_serial(struct md_rdev *rdev)
151 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
154 kvfree(rdev->serial);
158 static void rdevs_uninit_serial(struct mddev *mddev)
160 struct md_rdev *rdev;
162 rdev_for_each(rdev, mddev)
163 rdev_uninit_serial(rdev);
166 static int rdev_init_serial(struct md_rdev *rdev)
168 /* serial_nums equals with BARRIER_BUCKETS_NR */
169 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
170 struct serial_in_rdev *serial = NULL;
172 if (test_bit(CollisionCheck, &rdev->flags))
175 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
180 for (i = 0; i < serial_nums; i++) {
181 struct serial_in_rdev *serial_tmp = &serial[i];
183 spin_lock_init(&serial_tmp->serial_lock);
184 serial_tmp->serial_rb = RB_ROOT_CACHED;
185 init_waitqueue_head(&serial_tmp->serial_io_wait);
188 rdev->serial = serial;
189 set_bit(CollisionCheck, &rdev->flags);
194 static int rdevs_init_serial(struct mddev *mddev)
196 struct md_rdev *rdev;
199 rdev_for_each(rdev, mddev) {
200 ret = rdev_init_serial(rdev);
205 /* Free all resources if pool is not existed */
206 if (ret && !mddev->serial_info_pool)
207 rdevs_uninit_serial(mddev);
213 * rdev needs to enable serial stuffs if it meets the conditions:
214 * 1. it is multi-queue device flaged with writemostly.
215 * 2. the write-behind mode is enabled.
217 static int rdev_need_serial(struct md_rdev *rdev)
219 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
220 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
221 test_bit(WriteMostly, &rdev->flags));
225 * Init resource for rdev(s), then create serial_info_pool if:
226 * 1. rdev is the first device which return true from rdev_enable_serial.
227 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
229 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev)
233 if (rdev && !rdev_need_serial(rdev) &&
234 !test_bit(CollisionCheck, &rdev->flags))
238 ret = rdevs_init_serial(mddev);
240 ret = rdev_init_serial(rdev);
244 if (mddev->serial_info_pool == NULL) {
246 * already in memalloc noio context by
249 mddev->serial_info_pool =
250 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
251 sizeof(struct serial_info));
252 if (!mddev->serial_info_pool) {
253 rdevs_uninit_serial(mddev);
254 pr_err("can't alloc memory pool for serialization\n");
260 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
261 * 1. rdev is the last device flaged with CollisionCheck.
262 * 2. when bitmap is destroyed while policy is not enabled.
263 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
265 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev)
267 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
270 if (mddev->serial_info_pool) {
271 struct md_rdev *temp;
272 int num = 0; /* used to track if other rdevs need the pool */
274 rdev_for_each(temp, mddev) {
276 if (!mddev->serialize_policy ||
277 !rdev_need_serial(temp))
278 rdev_uninit_serial(temp);
281 } else if (temp != rdev &&
282 test_bit(CollisionCheck, &temp->flags))
287 rdev_uninit_serial(rdev);
290 pr_info("The mempool could be used by other devices\n");
292 mempool_destroy(mddev->serial_info_pool);
293 mddev->serial_info_pool = NULL;
298 static struct ctl_table_header *raid_table_header;
300 static struct ctl_table raid_table[] = {
302 .procname = "speed_limit_min",
303 .data = &sysctl_speed_limit_min,
304 .maxlen = sizeof(int),
305 .mode = S_IRUGO|S_IWUSR,
306 .proc_handler = proc_dointvec,
309 .procname = "speed_limit_max",
310 .data = &sysctl_speed_limit_max,
311 .maxlen = sizeof(int),
312 .mode = S_IRUGO|S_IWUSR,
313 .proc_handler = proc_dointvec,
317 static int start_readonly;
320 * The original mechanism for creating an md device is to create
321 * a device node in /dev and to open it. This causes races with device-close.
322 * The preferred method is to write to the "new_array" module parameter.
323 * This can avoid races.
324 * Setting create_on_open to false disables the original mechanism
325 * so all the races disappear.
327 static bool create_on_open = true;
330 * We have a system wide 'event count' that is incremented
331 * on any 'interesting' event, and readers of /proc/mdstat
332 * can use 'poll' or 'select' to find out when the event
336 * start array, stop array, error, add device, remove device,
337 * start build, activate spare
339 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
340 static atomic_t md_event_count;
341 void md_new_event(void)
343 atomic_inc(&md_event_count);
344 wake_up(&md_event_waiters);
346 EXPORT_SYMBOL_GPL(md_new_event);
349 * Enables to iterate over all existing md arrays
350 * all_mddevs_lock protects this list.
352 static LIST_HEAD(all_mddevs);
353 static DEFINE_SPINLOCK(all_mddevs_lock);
355 static bool is_md_suspended(struct mddev *mddev)
357 return percpu_ref_is_dying(&mddev->active_io);
359 /* Rather than calling directly into the personality make_request function,
360 * IO requests come here first so that we can check if the device is
361 * being suspended pending a reconfiguration.
362 * We hold a refcount over the call to ->make_request. By the time that
363 * call has finished, the bio has been linked into some internal structure
364 * and so is visible to ->quiesce(), so we don't need the refcount any more.
366 static bool is_suspended(struct mddev *mddev, struct bio *bio)
368 if (is_md_suspended(mddev))
370 if (bio_data_dir(bio) != WRITE)
372 if (READ_ONCE(mddev->suspend_lo) >= READ_ONCE(mddev->suspend_hi))
374 if (bio->bi_iter.bi_sector >= READ_ONCE(mddev->suspend_hi))
376 if (bio_end_sector(bio) < READ_ONCE(mddev->suspend_lo))
381 void md_handle_request(struct mddev *mddev, struct bio *bio)
384 if (is_suspended(mddev, bio)) {
386 /* Bail out if REQ_NOWAIT is set for the bio */
387 if (bio->bi_opf & REQ_NOWAIT) {
388 bio_wouldblock_error(bio);
392 prepare_to_wait(&mddev->sb_wait, &__wait,
393 TASK_UNINTERRUPTIBLE);
394 if (!is_suspended(mddev, bio))
398 finish_wait(&mddev->sb_wait, &__wait);
400 if (!percpu_ref_tryget_live(&mddev->active_io))
401 goto check_suspended;
403 if (!mddev->pers->make_request(mddev, bio)) {
404 percpu_ref_put(&mddev->active_io);
405 goto check_suspended;
408 percpu_ref_put(&mddev->active_io);
410 EXPORT_SYMBOL(md_handle_request);
412 static void md_submit_bio(struct bio *bio)
414 const int rw = bio_data_dir(bio);
415 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
417 if (mddev == NULL || mddev->pers == NULL) {
422 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
427 bio = bio_split_to_limits(bio);
431 if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) {
432 if (bio_sectors(bio) != 0)
433 bio->bi_status = BLK_STS_IOERR;
438 /* bio could be mergeable after passing to underlayer */
439 bio->bi_opf &= ~REQ_NOMERGE;
441 md_handle_request(mddev, bio);
445 * Make sure no new requests are submitted to the device, and any requests that
446 * have been submitted are completely handled.
448 int mddev_suspend(struct mddev *mddev, bool interruptible)
453 * hold reconfig_mutex to wait for normal io will deadlock, because
454 * other context can't update super_block, and normal io can rely on
455 * updating super_block.
457 lockdep_assert_not_held(&mddev->reconfig_mutex);
460 err = mutex_lock_interruptible(&mddev->suspend_mutex);
462 mutex_lock(&mddev->suspend_mutex);
466 if (mddev->suspended) {
467 WRITE_ONCE(mddev->suspended, mddev->suspended + 1);
468 mutex_unlock(&mddev->suspend_mutex);
472 percpu_ref_kill(&mddev->active_io);
474 err = wait_event_interruptible(mddev->sb_wait,
475 percpu_ref_is_zero(&mddev->active_io));
477 wait_event(mddev->sb_wait,
478 percpu_ref_is_zero(&mddev->active_io));
480 percpu_ref_resurrect(&mddev->active_io);
481 mutex_unlock(&mddev->suspend_mutex);
486 * For raid456, io might be waiting for reshape to make progress,
487 * allow new reshape to start while waiting for io to be done to
490 WRITE_ONCE(mddev->suspended, mddev->suspended + 1);
492 del_timer_sync(&mddev->safemode_timer);
493 /* restrict memory reclaim I/O during raid array is suspend */
494 mddev->noio_flag = memalloc_noio_save();
496 mutex_unlock(&mddev->suspend_mutex);
499 EXPORT_SYMBOL_GPL(mddev_suspend);
501 static void __mddev_resume(struct mddev *mddev, bool recovery_needed)
503 lockdep_assert_not_held(&mddev->reconfig_mutex);
505 mutex_lock(&mddev->suspend_mutex);
506 WRITE_ONCE(mddev->suspended, mddev->suspended - 1);
507 if (mddev->suspended) {
508 mutex_unlock(&mddev->suspend_mutex);
512 /* entred the memalloc scope from mddev_suspend() */
513 memalloc_noio_restore(mddev->noio_flag);
515 percpu_ref_resurrect(&mddev->active_io);
516 wake_up(&mddev->sb_wait);
519 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
520 md_wakeup_thread(mddev->thread);
521 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
523 mutex_unlock(&mddev->suspend_mutex);
526 void mddev_resume(struct mddev *mddev)
528 return __mddev_resume(mddev, true);
530 EXPORT_SYMBOL_GPL(mddev_resume);
532 /* sync bdev before setting device to readonly or stopping raid*/
533 static int mddev_set_closing_and_sync_blockdev(struct mddev *mddev, int opener_num)
535 mutex_lock(&mddev->open_mutex);
536 if (mddev->pers && atomic_read(&mddev->openers) > opener_num) {
537 mutex_unlock(&mddev->open_mutex);
540 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
541 mutex_unlock(&mddev->open_mutex);
544 mutex_unlock(&mddev->open_mutex);
546 sync_blockdev(mddev->gendisk->part0);
551 * Generic flush handling for md
554 static void md_end_flush(struct bio *bio)
556 struct md_rdev *rdev = bio->bi_private;
557 struct mddev *mddev = rdev->mddev;
561 rdev_dec_pending(rdev, mddev);
563 if (atomic_dec_and_test(&mddev->flush_pending)) {
564 /* The pair is percpu_ref_get() from md_flush_request() */
565 percpu_ref_put(&mddev->active_io);
567 /* The pre-request flush has finished */
568 queue_work(md_wq, &mddev->flush_work);
572 static void md_submit_flush_data(struct work_struct *ws);
574 static void submit_flushes(struct work_struct *ws)
576 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
577 struct md_rdev *rdev;
579 mddev->start_flush = ktime_get_boottime();
580 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
581 atomic_set(&mddev->flush_pending, 1);
583 rdev_for_each_rcu(rdev, mddev)
584 if (rdev->raid_disk >= 0 &&
585 !test_bit(Faulty, &rdev->flags)) {
588 atomic_inc(&rdev->nr_pending);
590 bi = bio_alloc_bioset(rdev->bdev, 0,
591 REQ_OP_WRITE | REQ_PREFLUSH,
592 GFP_NOIO, &mddev->bio_set);
593 bi->bi_end_io = md_end_flush;
594 bi->bi_private = rdev;
595 atomic_inc(&mddev->flush_pending);
600 if (atomic_dec_and_test(&mddev->flush_pending))
601 queue_work(md_wq, &mddev->flush_work);
604 static void md_submit_flush_data(struct work_struct *ws)
606 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
607 struct bio *bio = mddev->flush_bio;
610 * must reset flush_bio before calling into md_handle_request to avoid a
611 * deadlock, because other bios passed md_handle_request suspend check
612 * could wait for this and below md_handle_request could wait for those
613 * bios because of suspend check
615 spin_lock_irq(&mddev->lock);
616 mddev->prev_flush_start = mddev->start_flush;
617 mddev->flush_bio = NULL;
618 spin_unlock_irq(&mddev->lock);
619 wake_up(&mddev->sb_wait);
621 if (bio->bi_iter.bi_size == 0) {
622 /* an empty barrier - all done */
625 bio->bi_opf &= ~REQ_PREFLUSH;
626 md_handle_request(mddev, bio);
631 * Manages consolidation of flushes and submitting any flushes needed for
632 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
633 * being finished in another context. Returns false if the flushing is
634 * complete but still needs the I/O portion of the bio to be processed.
636 bool md_flush_request(struct mddev *mddev, struct bio *bio)
638 ktime_t req_start = ktime_get_boottime();
639 spin_lock_irq(&mddev->lock);
640 /* flush requests wait until ongoing flush completes,
641 * hence coalescing all the pending requests.
643 wait_event_lock_irq(mddev->sb_wait,
645 ktime_before(req_start, mddev->prev_flush_start),
647 /* new request after previous flush is completed */
648 if (ktime_after(req_start, mddev->prev_flush_start)) {
649 WARN_ON(mddev->flush_bio);
651 * Grab a reference to make sure mddev_suspend() will wait for
652 * this flush to be done.
654 * md_flush_reqeust() is called under md_handle_request() and
655 * 'active_io' is already grabbed, hence percpu_ref_is_zero()
656 * won't pass, percpu_ref_tryget_live() can't be used because
657 * percpu_ref_kill() can be called by mddev_suspend()
660 WARN_ON(percpu_ref_is_zero(&mddev->active_io));
661 percpu_ref_get(&mddev->active_io);
662 mddev->flush_bio = bio;
665 spin_unlock_irq(&mddev->lock);
668 INIT_WORK(&mddev->flush_work, submit_flushes);
669 queue_work(md_wq, &mddev->flush_work);
671 /* flush was performed for some other bio while we waited. */
672 if (bio->bi_iter.bi_size == 0)
673 /* an empty barrier - all done */
676 bio->bi_opf &= ~REQ_PREFLUSH;
682 EXPORT_SYMBOL(md_flush_request);
684 static inline struct mddev *mddev_get(struct mddev *mddev)
686 lockdep_assert_held(&all_mddevs_lock);
688 if (test_bit(MD_DELETED, &mddev->flags))
690 atomic_inc(&mddev->active);
694 static void mddev_delayed_delete(struct work_struct *ws);
696 static void __mddev_put(struct mddev *mddev)
698 if (mddev->raid_disks || !list_empty(&mddev->disks) ||
699 mddev->ctime || mddev->hold_active)
702 /* Array is not configured at all, and not held active, so destroy it */
703 set_bit(MD_DELETED, &mddev->flags);
706 * Call queue_work inside the spinlock so that flush_workqueue() after
707 * mddev_find will succeed in waiting for the work to be done.
709 queue_work(md_misc_wq, &mddev->del_work);
712 void mddev_put(struct mddev *mddev)
714 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
718 spin_unlock(&all_mddevs_lock);
721 static void md_safemode_timeout(struct timer_list *t);
722 static void md_start_sync(struct work_struct *ws);
724 static void active_io_release(struct percpu_ref *ref)
726 struct mddev *mddev = container_of(ref, struct mddev, active_io);
728 wake_up(&mddev->sb_wait);
731 static void no_op(struct percpu_ref *r) {}
733 int mddev_init(struct mddev *mddev)
736 if (percpu_ref_init(&mddev->active_io, active_io_release,
737 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
740 if (percpu_ref_init(&mddev->writes_pending, no_op,
741 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
742 percpu_ref_exit(&mddev->active_io);
746 /* We want to start with the refcount at zero */
747 percpu_ref_put(&mddev->writes_pending);
749 mutex_init(&mddev->open_mutex);
750 mutex_init(&mddev->reconfig_mutex);
751 mutex_init(&mddev->sync_mutex);
752 mutex_init(&mddev->suspend_mutex);
753 mutex_init(&mddev->bitmap_info.mutex);
754 INIT_LIST_HEAD(&mddev->disks);
755 INIT_LIST_HEAD(&mddev->all_mddevs);
756 INIT_LIST_HEAD(&mddev->deleting);
757 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
758 atomic_set(&mddev->active, 1);
759 atomic_set(&mddev->openers, 0);
760 atomic_set(&mddev->sync_seq, 0);
761 spin_lock_init(&mddev->lock);
762 atomic_set(&mddev->flush_pending, 0);
763 init_waitqueue_head(&mddev->sb_wait);
764 init_waitqueue_head(&mddev->recovery_wait);
765 mddev->reshape_position = MaxSector;
766 mddev->reshape_backwards = 0;
767 mddev->last_sync_action = "none";
768 mddev->resync_min = 0;
769 mddev->resync_max = MaxSector;
770 mddev->level = LEVEL_NONE;
772 INIT_WORK(&mddev->sync_work, md_start_sync);
773 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
777 EXPORT_SYMBOL_GPL(mddev_init);
779 void mddev_destroy(struct mddev *mddev)
781 percpu_ref_exit(&mddev->active_io);
782 percpu_ref_exit(&mddev->writes_pending);
784 EXPORT_SYMBOL_GPL(mddev_destroy);
786 static struct mddev *mddev_find_locked(dev_t unit)
790 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
791 if (mddev->unit == unit)
797 /* find an unused unit number */
798 static dev_t mddev_alloc_unit(void)
800 static int next_minor = 512;
801 int start = next_minor;
806 dev = MKDEV(MD_MAJOR, next_minor);
808 if (next_minor > MINORMASK)
810 if (next_minor == start)
811 return 0; /* Oh dear, all in use. */
812 is_free = !mddev_find_locked(dev);
818 static struct mddev *mddev_alloc(dev_t unit)
823 if (unit && MAJOR(unit) != MD_MAJOR)
824 unit &= ~((1 << MdpMinorShift) - 1);
826 new = kzalloc(sizeof(*new), GFP_KERNEL);
828 return ERR_PTR(-ENOMEM);
830 error = mddev_init(new);
834 spin_lock(&all_mddevs_lock);
837 if (mddev_find_locked(unit))
838 goto out_destroy_new;
840 if (MAJOR(unit) == MD_MAJOR)
841 new->md_minor = MINOR(unit);
843 new->md_minor = MINOR(unit) >> MdpMinorShift;
844 new->hold_active = UNTIL_IOCTL;
847 new->unit = mddev_alloc_unit();
849 goto out_destroy_new;
850 new->md_minor = MINOR(new->unit);
851 new->hold_active = UNTIL_STOP;
854 list_add(&new->all_mddevs, &all_mddevs);
855 spin_unlock(&all_mddevs_lock);
859 spin_unlock(&all_mddevs_lock);
863 return ERR_PTR(error);
866 static void mddev_free(struct mddev *mddev)
868 spin_lock(&all_mddevs_lock);
869 list_del(&mddev->all_mddevs);
870 spin_unlock(&all_mddevs_lock);
872 mddev_destroy(mddev);
876 static const struct attribute_group md_redundancy_group;
878 void mddev_unlock(struct mddev *mddev)
880 struct md_rdev *rdev;
884 if (!list_empty(&mddev->deleting))
885 list_splice_init(&mddev->deleting, &delete);
887 if (mddev->to_remove) {
888 /* These cannot be removed under reconfig_mutex as
889 * an access to the files will try to take reconfig_mutex
890 * while holding the file unremovable, which leads to
892 * So hold set sysfs_active while the remove in happeing,
893 * and anything else which might set ->to_remove or my
894 * otherwise change the sysfs namespace will fail with
895 * -EBUSY if sysfs_active is still set.
896 * We set sysfs_active under reconfig_mutex and elsewhere
897 * test it under the same mutex to ensure its correct value
900 const struct attribute_group *to_remove = mddev->to_remove;
901 mddev->to_remove = NULL;
902 mddev->sysfs_active = 1;
903 mutex_unlock(&mddev->reconfig_mutex);
905 if (mddev->kobj.sd) {
906 if (to_remove != &md_redundancy_group)
907 sysfs_remove_group(&mddev->kobj, to_remove);
908 if (mddev->pers == NULL ||
909 mddev->pers->sync_request == NULL) {
910 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
911 if (mddev->sysfs_action)
912 sysfs_put(mddev->sysfs_action);
913 if (mddev->sysfs_completed)
914 sysfs_put(mddev->sysfs_completed);
915 if (mddev->sysfs_degraded)
916 sysfs_put(mddev->sysfs_degraded);
917 mddev->sysfs_action = NULL;
918 mddev->sysfs_completed = NULL;
919 mddev->sysfs_degraded = NULL;
922 mddev->sysfs_active = 0;
924 mutex_unlock(&mddev->reconfig_mutex);
926 md_wakeup_thread(mddev->thread);
927 wake_up(&mddev->sb_wait);
929 list_for_each_entry_safe(rdev, tmp, &delete, same_set) {
930 list_del_init(&rdev->same_set);
931 kobject_del(&rdev->kobj);
932 export_rdev(rdev, mddev);
935 EXPORT_SYMBOL_GPL(mddev_unlock);
937 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
939 struct md_rdev *rdev;
941 rdev_for_each_rcu(rdev, mddev)
942 if (rdev->desc_nr == nr)
947 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
949 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
951 struct md_rdev *rdev;
953 rdev_for_each(rdev, mddev)
954 if (rdev->bdev->bd_dev == dev)
960 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
962 struct md_rdev *rdev;
964 rdev_for_each_rcu(rdev, mddev)
965 if (rdev->bdev->bd_dev == dev)
970 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
972 static struct md_personality *find_pers(int level, char *clevel)
974 struct md_personality *pers;
975 list_for_each_entry(pers, &pers_list, list) {
976 if (level != LEVEL_NONE && pers->level == level)
978 if (strcmp(pers->name, clevel)==0)
984 /* return the offset of the super block in 512byte sectors */
985 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
987 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
990 static int alloc_disk_sb(struct md_rdev *rdev)
992 rdev->sb_page = alloc_page(GFP_KERNEL);
998 void md_rdev_clear(struct md_rdev *rdev)
1000 if (rdev->sb_page) {
1001 put_page(rdev->sb_page);
1002 rdev->sb_loaded = 0;
1003 rdev->sb_page = NULL;
1007 if (rdev->bb_page) {
1008 put_page(rdev->bb_page);
1009 rdev->bb_page = NULL;
1011 badblocks_exit(&rdev->badblocks);
1013 EXPORT_SYMBOL_GPL(md_rdev_clear);
1015 static void super_written(struct bio *bio)
1017 struct md_rdev *rdev = bio->bi_private;
1018 struct mddev *mddev = rdev->mddev;
1020 if (bio->bi_status) {
1021 pr_err("md: %s gets error=%d\n", __func__,
1022 blk_status_to_errno(bio->bi_status));
1023 md_error(mddev, rdev);
1024 if (!test_bit(Faulty, &rdev->flags)
1025 && (bio->bi_opf & MD_FAILFAST)) {
1026 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
1027 set_bit(LastDev, &rdev->flags);
1030 clear_bit(LastDev, &rdev->flags);
1034 rdev_dec_pending(rdev, mddev);
1036 if (atomic_dec_and_test(&mddev->pending_writes))
1037 wake_up(&mddev->sb_wait);
1040 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
1041 sector_t sector, int size, struct page *page)
1043 /* write first size bytes of page to sector of rdev
1044 * Increment mddev->pending_writes before returning
1045 * and decrement it on completion, waking up sb_wait
1046 * if zero is reached.
1047 * If an error occurred, call md_error
1054 if (test_bit(Faulty, &rdev->flags))
1057 bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
1059 REQ_OP_WRITE | REQ_SYNC | REQ_IDLE | REQ_META
1060 | REQ_PREFLUSH | REQ_FUA,
1061 GFP_NOIO, &mddev->sync_set);
1063 atomic_inc(&rdev->nr_pending);
1065 bio->bi_iter.bi_sector = sector;
1066 __bio_add_page(bio, page, size, 0);
1067 bio->bi_private = rdev;
1068 bio->bi_end_io = super_written;
1070 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
1071 test_bit(FailFast, &rdev->flags) &&
1072 !test_bit(LastDev, &rdev->flags))
1073 bio->bi_opf |= MD_FAILFAST;
1075 atomic_inc(&mddev->pending_writes);
1079 int md_super_wait(struct mddev *mddev)
1081 /* wait for all superblock writes that were scheduled to complete */
1082 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
1083 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
1088 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
1089 struct page *page, blk_opf_t opf, bool metadata_op)
1092 struct bio_vec bvec;
1094 if (metadata_op && rdev->meta_bdev)
1095 bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
1097 bio_init(&bio, rdev->bdev, &bvec, 1, opf);
1100 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1101 else if (rdev->mddev->reshape_position != MaxSector &&
1102 (rdev->mddev->reshape_backwards ==
1103 (sector >= rdev->mddev->reshape_position)))
1104 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1106 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1107 __bio_add_page(&bio, page, size, 0);
1109 submit_bio_wait(&bio);
1111 return !bio.bi_status;
1113 EXPORT_SYMBOL_GPL(sync_page_io);
1115 static int read_disk_sb(struct md_rdev *rdev, int size)
1117 if (rdev->sb_loaded)
1120 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true))
1122 rdev->sb_loaded = 1;
1126 pr_err("md: disabled device %pg, could not read superblock.\n",
1131 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1133 return sb1->set_uuid0 == sb2->set_uuid0 &&
1134 sb1->set_uuid1 == sb2->set_uuid1 &&
1135 sb1->set_uuid2 == sb2->set_uuid2 &&
1136 sb1->set_uuid3 == sb2->set_uuid3;
1139 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1142 mdp_super_t *tmp1, *tmp2;
1144 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1145 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1147 if (!tmp1 || !tmp2) {
1156 * nr_disks is not constant
1161 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1168 static u32 md_csum_fold(u32 csum)
1170 csum = (csum & 0xffff) + (csum >> 16);
1171 return (csum & 0xffff) + (csum >> 16);
1174 static unsigned int calc_sb_csum(mdp_super_t *sb)
1177 u32 *sb32 = (u32*)sb;
1179 unsigned int disk_csum, csum;
1181 disk_csum = sb->sb_csum;
1184 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1186 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1189 /* This used to use csum_partial, which was wrong for several
1190 * reasons including that different results are returned on
1191 * different architectures. It isn't critical that we get exactly
1192 * the same return value as before (we always csum_fold before
1193 * testing, and that removes any differences). However as we
1194 * know that csum_partial always returned a 16bit value on
1195 * alphas, do a fold to maximise conformity to previous behaviour.
1197 sb->sb_csum = md_csum_fold(disk_csum);
1199 sb->sb_csum = disk_csum;
1205 * Handle superblock details.
1206 * We want to be able to handle multiple superblock formats
1207 * so we have a common interface to them all, and an array of
1208 * different handlers.
1209 * We rely on user-space to write the initial superblock, and support
1210 * reading and updating of superblocks.
1211 * Interface methods are:
1212 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1213 * loads and validates a superblock on dev.
1214 * if refdev != NULL, compare superblocks on both devices
1216 * 0 - dev has a superblock that is compatible with refdev
1217 * 1 - dev has a superblock that is compatible and newer than refdev
1218 * so dev should be used as the refdev in future
1219 * -EINVAL superblock incompatible or invalid
1220 * -othererror e.g. -EIO
1222 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1223 * Verify that dev is acceptable into mddev.
1224 * The first time, mddev->raid_disks will be 0, and data from
1225 * dev should be merged in. Subsequent calls check that dev
1226 * is new enough. Return 0 or -EINVAL
1228 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1229 * Update the superblock for rdev with data in mddev
1230 * This does not write to disc.
1236 struct module *owner;
1237 int (*load_super)(struct md_rdev *rdev,
1238 struct md_rdev *refdev,
1240 int (*validate_super)(struct mddev *mddev,
1241 struct md_rdev *freshest,
1242 struct md_rdev *rdev);
1243 void (*sync_super)(struct mddev *mddev,
1244 struct md_rdev *rdev);
1245 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1246 sector_t num_sectors);
1247 int (*allow_new_offset)(struct md_rdev *rdev,
1248 unsigned long long new_offset);
1252 * Check that the given mddev has no bitmap.
1254 * This function is called from the run method of all personalities that do not
1255 * support bitmaps. It prints an error message and returns non-zero if mddev
1256 * has a bitmap. Otherwise, it returns 0.
1259 int md_check_no_bitmap(struct mddev *mddev)
1261 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1263 pr_warn("%s: bitmaps are not supported for %s\n",
1264 mdname(mddev), mddev->pers->name);
1267 EXPORT_SYMBOL(md_check_no_bitmap);
1270 * load_super for 0.90.0
1272 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1276 bool spare_disk = true;
1279 * Calculate the position of the superblock (512byte sectors),
1280 * it's at the end of the disk.
1282 * It also happens to be a multiple of 4Kb.
1284 rdev->sb_start = calc_dev_sboffset(rdev);
1286 ret = read_disk_sb(rdev, MD_SB_BYTES);
1292 sb = page_address(rdev->sb_page);
1294 if (sb->md_magic != MD_SB_MAGIC) {
1295 pr_warn("md: invalid raid superblock magic on %pg\n",
1300 if (sb->major_version != 0 ||
1301 sb->minor_version < 90 ||
1302 sb->minor_version > 91) {
1303 pr_warn("Bad version number %d.%d on %pg\n",
1304 sb->major_version, sb->minor_version, rdev->bdev);
1308 if (sb->raid_disks <= 0)
1311 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1312 pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
1316 rdev->preferred_minor = sb->md_minor;
1317 rdev->data_offset = 0;
1318 rdev->new_data_offset = 0;
1319 rdev->sb_size = MD_SB_BYTES;
1320 rdev->badblocks.shift = -1;
1322 rdev->desc_nr = sb->this_disk.number;
1324 /* not spare disk */
1325 if (rdev->desc_nr >= 0 && rdev->desc_nr < MD_SB_DISKS &&
1326 sb->disks[rdev->desc_nr].state & ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1336 mdp_super_t *refsb = page_address(refdev->sb_page);
1337 if (!md_uuid_equal(refsb, sb)) {
1338 pr_warn("md: %pg has different UUID to %pg\n",
1339 rdev->bdev, refdev->bdev);
1342 if (!md_sb_equal(refsb, sb)) {
1343 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1344 rdev->bdev, refdev->bdev);
1348 ev2 = md_event(refsb);
1350 if (!spare_disk && ev1 > ev2)
1355 rdev->sectors = rdev->sb_start;
1356 /* Limit to 4TB as metadata cannot record more than that.
1357 * (not needed for Linear and RAID0 as metadata doesn't
1360 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1361 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1363 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1364 /* "this cannot possibly happen" ... */
1372 * validate_super for 0.90.0
1373 * note: we are not using "freshest" for 0.9 superblock
1375 static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1378 mdp_super_t *sb = page_address(rdev->sb_page);
1379 __u64 ev1 = md_event(sb);
1381 rdev->raid_disk = -1;
1382 clear_bit(Faulty, &rdev->flags);
1383 clear_bit(In_sync, &rdev->flags);
1384 clear_bit(Bitmap_sync, &rdev->flags);
1385 clear_bit(WriteMostly, &rdev->flags);
1387 if (mddev->raid_disks == 0) {
1388 mddev->major_version = 0;
1389 mddev->minor_version = sb->minor_version;
1390 mddev->patch_version = sb->patch_version;
1391 mddev->external = 0;
1392 mddev->chunk_sectors = sb->chunk_size >> 9;
1393 mddev->ctime = sb->ctime;
1394 mddev->utime = sb->utime;
1395 mddev->level = sb->level;
1396 mddev->clevel[0] = 0;
1397 mddev->layout = sb->layout;
1398 mddev->raid_disks = sb->raid_disks;
1399 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1400 mddev->events = ev1;
1401 mddev->bitmap_info.offset = 0;
1402 mddev->bitmap_info.space = 0;
1403 /* bitmap can use 60 K after the 4K superblocks */
1404 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1405 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1406 mddev->reshape_backwards = 0;
1408 if (mddev->minor_version >= 91) {
1409 mddev->reshape_position = sb->reshape_position;
1410 mddev->delta_disks = sb->delta_disks;
1411 mddev->new_level = sb->new_level;
1412 mddev->new_layout = sb->new_layout;
1413 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1414 if (mddev->delta_disks < 0)
1415 mddev->reshape_backwards = 1;
1417 mddev->reshape_position = MaxSector;
1418 mddev->delta_disks = 0;
1419 mddev->new_level = mddev->level;
1420 mddev->new_layout = mddev->layout;
1421 mddev->new_chunk_sectors = mddev->chunk_sectors;
1423 if (mddev->level == 0)
1426 if (sb->state & (1<<MD_SB_CLEAN))
1427 mddev->recovery_cp = MaxSector;
1429 if (sb->events_hi == sb->cp_events_hi &&
1430 sb->events_lo == sb->cp_events_lo) {
1431 mddev->recovery_cp = sb->recovery_cp;
1433 mddev->recovery_cp = 0;
1436 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1437 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1438 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1439 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1441 mddev->max_disks = MD_SB_DISKS;
1443 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1444 mddev->bitmap_info.file == NULL) {
1445 mddev->bitmap_info.offset =
1446 mddev->bitmap_info.default_offset;
1447 mddev->bitmap_info.space =
1448 mddev->bitmap_info.default_space;
1451 } else if (mddev->pers == NULL) {
1452 /* Insist on good event counter while assembling, except
1453 * for spares (which don't need an event count) */
1455 if (sb->disks[rdev->desc_nr].state & (
1456 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1457 if (ev1 < mddev->events)
1459 } else if (mddev->bitmap) {
1460 /* if adding to array with a bitmap, then we can accept an
1461 * older device ... but not too old.
1463 if (ev1 < mddev->bitmap->events_cleared)
1465 if (ev1 < mddev->events)
1466 set_bit(Bitmap_sync, &rdev->flags);
1468 if (ev1 < mddev->events)
1469 /* just a hot-add of a new device, leave raid_disk at -1 */
1473 desc = sb->disks + rdev->desc_nr;
1475 if (desc->state & (1<<MD_DISK_FAULTY))
1476 set_bit(Faulty, &rdev->flags);
1477 else if (desc->state & (1<<MD_DISK_SYNC)) {
1478 set_bit(In_sync, &rdev->flags);
1479 rdev->raid_disk = desc->raid_disk;
1480 rdev->saved_raid_disk = desc->raid_disk;
1481 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1482 /* active but not in sync implies recovery up to
1483 * reshape position. We don't know exactly where
1484 * that is, so set to zero for now
1486 if (mddev->minor_version >= 91) {
1487 rdev->recovery_offset = 0;
1488 rdev->raid_disk = desc->raid_disk;
1491 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1492 set_bit(WriteMostly, &rdev->flags);
1493 if (desc->state & (1<<MD_DISK_FAILFAST))
1494 set_bit(FailFast, &rdev->flags);
1499 * sync_super for 0.90.0
1501 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1504 struct md_rdev *rdev2;
1505 int next_spare = mddev->raid_disks;
1507 /* make rdev->sb match mddev data..
1510 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1511 * 3/ any empty disks < next_spare become removed
1513 * disks[0] gets initialised to REMOVED because
1514 * we cannot be sure from other fields if it has
1515 * been initialised or not.
1518 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1520 rdev->sb_size = MD_SB_BYTES;
1522 sb = page_address(rdev->sb_page);
1524 memset(sb, 0, sizeof(*sb));
1526 sb->md_magic = MD_SB_MAGIC;
1527 sb->major_version = mddev->major_version;
1528 sb->patch_version = mddev->patch_version;
1529 sb->gvalid_words = 0; /* ignored */
1530 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1531 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1532 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1533 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1535 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1536 sb->level = mddev->level;
1537 sb->size = mddev->dev_sectors / 2;
1538 sb->raid_disks = mddev->raid_disks;
1539 sb->md_minor = mddev->md_minor;
1540 sb->not_persistent = 0;
1541 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1543 sb->events_hi = (mddev->events>>32);
1544 sb->events_lo = (u32)mddev->events;
1546 if (mddev->reshape_position == MaxSector)
1547 sb->minor_version = 90;
1549 sb->minor_version = 91;
1550 sb->reshape_position = mddev->reshape_position;
1551 sb->new_level = mddev->new_level;
1552 sb->delta_disks = mddev->delta_disks;
1553 sb->new_layout = mddev->new_layout;
1554 sb->new_chunk = mddev->new_chunk_sectors << 9;
1556 mddev->minor_version = sb->minor_version;
1559 sb->recovery_cp = mddev->recovery_cp;
1560 sb->cp_events_hi = (mddev->events>>32);
1561 sb->cp_events_lo = (u32)mddev->events;
1562 if (mddev->recovery_cp == MaxSector)
1563 sb->state = (1<< MD_SB_CLEAN);
1565 sb->recovery_cp = 0;
1567 sb->layout = mddev->layout;
1568 sb->chunk_size = mddev->chunk_sectors << 9;
1570 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1571 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1573 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1574 rdev_for_each(rdev2, mddev) {
1577 int is_active = test_bit(In_sync, &rdev2->flags);
1579 if (rdev2->raid_disk >= 0 &&
1580 sb->minor_version >= 91)
1581 /* we have nowhere to store the recovery_offset,
1582 * but if it is not below the reshape_position,
1583 * we can piggy-back on that.
1586 if (rdev2->raid_disk < 0 ||
1587 test_bit(Faulty, &rdev2->flags))
1590 desc_nr = rdev2->raid_disk;
1592 desc_nr = next_spare++;
1593 rdev2->desc_nr = desc_nr;
1594 d = &sb->disks[rdev2->desc_nr];
1596 d->number = rdev2->desc_nr;
1597 d->major = MAJOR(rdev2->bdev->bd_dev);
1598 d->minor = MINOR(rdev2->bdev->bd_dev);
1600 d->raid_disk = rdev2->raid_disk;
1602 d->raid_disk = rdev2->desc_nr; /* compatibility */
1603 if (test_bit(Faulty, &rdev2->flags))
1604 d->state = (1<<MD_DISK_FAULTY);
1605 else if (is_active) {
1606 d->state = (1<<MD_DISK_ACTIVE);
1607 if (test_bit(In_sync, &rdev2->flags))
1608 d->state |= (1<<MD_DISK_SYNC);
1616 if (test_bit(WriteMostly, &rdev2->flags))
1617 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1618 if (test_bit(FailFast, &rdev2->flags))
1619 d->state |= (1<<MD_DISK_FAILFAST);
1621 /* now set the "removed" and "faulty" bits on any missing devices */
1622 for (i=0 ; i < mddev->raid_disks ; i++) {
1623 mdp_disk_t *d = &sb->disks[i];
1624 if (d->state == 0 && d->number == 0) {
1627 d->state = (1<<MD_DISK_REMOVED);
1628 d->state |= (1<<MD_DISK_FAULTY);
1632 sb->nr_disks = nr_disks;
1633 sb->active_disks = active;
1634 sb->working_disks = working;
1635 sb->failed_disks = failed;
1636 sb->spare_disks = spare;
1638 sb->this_disk = sb->disks[rdev->desc_nr];
1639 sb->sb_csum = calc_sb_csum(sb);
1643 * rdev_size_change for 0.90.0
1645 static unsigned long long
1646 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1648 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1649 return 0; /* component must fit device */
1650 if (rdev->mddev->bitmap_info.offset)
1651 return 0; /* can't move bitmap */
1652 rdev->sb_start = calc_dev_sboffset(rdev);
1653 if (!num_sectors || num_sectors > rdev->sb_start)
1654 num_sectors = rdev->sb_start;
1655 /* Limit to 4TB as metadata cannot record more than that.
1656 * 4TB == 2^32 KB, or 2*2^32 sectors.
1658 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1659 num_sectors = (sector_t)(2ULL << 32) - 2;
1661 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1663 } while (md_super_wait(rdev->mddev) < 0);
1668 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1670 /* non-zero offset changes not possible with v0.90 */
1671 return new_offset == 0;
1675 * version 1 superblock
1678 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1682 unsigned long long newcsum;
1683 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1684 __le32 *isuper = (__le32*)sb;
1686 disk_csum = sb->sb_csum;
1689 for (; size >= 4; size -= 4)
1690 newcsum += le32_to_cpu(*isuper++);
1693 newcsum += le16_to_cpu(*(__le16*) isuper);
1695 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1696 sb->sb_csum = disk_csum;
1697 return cpu_to_le32(csum);
1700 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1702 struct mdp_superblock_1 *sb;
1707 bool spare_disk = true;
1710 * Calculate the position of the superblock in 512byte sectors.
1711 * It is always aligned to a 4K boundary and
1712 * depeding on minor_version, it can be:
1713 * 0: At least 8K, but less than 12K, from end of device
1714 * 1: At start of device
1715 * 2: 4K from start of device.
1717 switch(minor_version) {
1719 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1720 sb_start &= ~(sector_t)(4*2-1);
1731 rdev->sb_start = sb_start;
1733 /* superblock is rarely larger than 1K, but it can be larger,
1734 * and it is safe to read 4k, so we do that
1736 ret = read_disk_sb(rdev, 4096);
1737 if (ret) return ret;
1739 sb = page_address(rdev->sb_page);
1741 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1742 sb->major_version != cpu_to_le32(1) ||
1743 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1744 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1745 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1748 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1749 pr_warn("md: invalid superblock checksum on %pg\n",
1753 if (le64_to_cpu(sb->data_size) < 10) {
1754 pr_warn("md: data_size too small on %pg\n",
1760 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1761 /* Some padding is non-zero, might be a new feature */
1764 rdev->preferred_minor = 0xffff;
1765 rdev->data_offset = le64_to_cpu(sb->data_offset);
1766 rdev->new_data_offset = rdev->data_offset;
1767 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1768 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1769 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1770 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1772 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1773 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1774 if (rdev->sb_size & bmask)
1775 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1778 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1781 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1784 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1786 if (!rdev->bb_page) {
1787 rdev->bb_page = alloc_page(GFP_KERNEL);
1791 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1792 rdev->badblocks.count == 0) {
1793 /* need to load the bad block list.
1794 * Currently we limit it to one page.
1800 int sectors = le16_to_cpu(sb->bblog_size);
1801 if (sectors > (PAGE_SIZE / 512))
1803 offset = le32_to_cpu(sb->bblog_offset);
1806 bb_sector = (long long)offset;
1807 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1808 rdev->bb_page, REQ_OP_READ, true))
1810 bbp = (__le64 *)page_address(rdev->bb_page);
1811 rdev->badblocks.shift = sb->bblog_shift;
1812 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1813 u64 bb = le64_to_cpu(*bbp);
1814 int count = bb & (0x3ff);
1815 u64 sector = bb >> 10;
1816 sector <<= sb->bblog_shift;
1817 count <<= sb->bblog_shift;
1820 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1823 } else if (sb->bblog_offset != 0)
1824 rdev->badblocks.shift = 0;
1826 if ((le32_to_cpu(sb->feature_map) &
1827 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1828 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1829 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1830 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1833 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1837 /* not spare disk */
1838 if (rdev->desc_nr >= 0 && rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1839 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1840 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1850 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1852 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1853 sb->level != refsb->level ||
1854 sb->layout != refsb->layout ||
1855 sb->chunksize != refsb->chunksize) {
1856 pr_warn("md: %pg has strangely different superblock to %pg\n",
1861 ev1 = le64_to_cpu(sb->events);
1862 ev2 = le64_to_cpu(refsb->events);
1864 if (!spare_disk && ev1 > ev2)
1870 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1872 sectors = rdev->sb_start;
1873 if (sectors < le64_to_cpu(sb->data_size))
1875 rdev->sectors = le64_to_cpu(sb->data_size);
1879 static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1881 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1882 __u64 ev1 = le64_to_cpu(sb->events);
1885 rdev->raid_disk = -1;
1886 clear_bit(Faulty, &rdev->flags);
1887 clear_bit(In_sync, &rdev->flags);
1888 clear_bit(Bitmap_sync, &rdev->flags);
1889 clear_bit(WriteMostly, &rdev->flags);
1891 if (mddev->raid_disks == 0) {
1892 mddev->major_version = 1;
1893 mddev->patch_version = 0;
1894 mddev->external = 0;
1895 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1896 mddev->ctime = le64_to_cpu(sb->ctime);
1897 mddev->utime = le64_to_cpu(sb->utime);
1898 mddev->level = le32_to_cpu(sb->level);
1899 mddev->clevel[0] = 0;
1900 mddev->layout = le32_to_cpu(sb->layout);
1901 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1902 mddev->dev_sectors = le64_to_cpu(sb->size);
1903 mddev->events = ev1;
1904 mddev->bitmap_info.offset = 0;
1905 mddev->bitmap_info.space = 0;
1906 /* Default location for bitmap is 1K after superblock
1907 * using 3K - total of 4K
1909 mddev->bitmap_info.default_offset = 1024 >> 9;
1910 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1911 mddev->reshape_backwards = 0;
1913 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1914 memcpy(mddev->uuid, sb->set_uuid, 16);
1916 mddev->max_disks = (4096-256)/2;
1918 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1919 mddev->bitmap_info.file == NULL) {
1920 mddev->bitmap_info.offset =
1921 (__s32)le32_to_cpu(sb->bitmap_offset);
1922 /* Metadata doesn't record how much space is available.
1923 * For 1.0, we assume we can use up to the superblock
1924 * if before, else to 4K beyond superblock.
1925 * For others, assume no change is possible.
1927 if (mddev->minor_version > 0)
1928 mddev->bitmap_info.space = 0;
1929 else if (mddev->bitmap_info.offset > 0)
1930 mddev->bitmap_info.space =
1931 8 - mddev->bitmap_info.offset;
1933 mddev->bitmap_info.space =
1934 -mddev->bitmap_info.offset;
1937 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1938 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1939 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1940 mddev->new_level = le32_to_cpu(sb->new_level);
1941 mddev->new_layout = le32_to_cpu(sb->new_layout);
1942 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1943 if (mddev->delta_disks < 0 ||
1944 (mddev->delta_disks == 0 &&
1945 (le32_to_cpu(sb->feature_map)
1946 & MD_FEATURE_RESHAPE_BACKWARDS)))
1947 mddev->reshape_backwards = 1;
1949 mddev->reshape_position = MaxSector;
1950 mddev->delta_disks = 0;
1951 mddev->new_level = mddev->level;
1952 mddev->new_layout = mddev->layout;
1953 mddev->new_chunk_sectors = mddev->chunk_sectors;
1956 if (mddev->level == 0 &&
1957 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1960 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1961 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1963 if (le32_to_cpu(sb->feature_map) &
1964 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1965 if (le32_to_cpu(sb->feature_map) &
1966 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1968 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1969 (le32_to_cpu(sb->feature_map) &
1970 MD_FEATURE_MULTIPLE_PPLS))
1972 set_bit(MD_HAS_PPL, &mddev->flags);
1974 } else if (mddev->pers == NULL) {
1975 /* Insist of good event counter while assembling, except for
1976 * spares (which don't need an event count).
1977 * Similar to mdadm, we allow event counter difference of 1
1978 * from the freshest device.
1980 if (rdev->desc_nr >= 0 &&
1981 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1982 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1983 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1984 if (ev1 + 1 < mddev->events)
1986 } else if (mddev->bitmap) {
1987 /* If adding to array with a bitmap, then we can accept an
1988 * older device, but not too old.
1990 if (ev1 < mddev->bitmap->events_cleared)
1992 if (ev1 < mddev->events)
1993 set_bit(Bitmap_sync, &rdev->flags);
1995 if (ev1 < mddev->events)
1996 /* just a hot-add of a new device, leave raid_disk at -1 */
2000 if (rdev->desc_nr < 0 ||
2001 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
2002 role = MD_DISK_ROLE_SPARE;
2004 } else if (mddev->pers == NULL && freshest && ev1 < mddev->events) {
2006 * If we are assembling, and our event counter is smaller than the
2007 * highest event counter, we cannot trust our superblock about the role.
2008 * It could happen that our rdev was marked as Faulty, and all other
2009 * superblocks were updated with +1 event counter.
2010 * Then, before the next superblock update, which typically happens when
2011 * remove_and_add_spares() removes the device from the array, there was
2012 * a crash or reboot.
2013 * If we allow current rdev without consulting the freshest superblock,
2014 * we could cause data corruption.
2015 * Note that in this case our event counter is smaller by 1 than the
2016 * highest, otherwise, this rdev would not be allowed into array;
2017 * both kernel and mdadm allow event counter difference of 1.
2019 struct mdp_superblock_1 *freshest_sb = page_address(freshest->sb_page);
2020 u32 freshest_max_dev = le32_to_cpu(freshest_sb->max_dev);
2022 if (rdev->desc_nr >= freshest_max_dev) {
2023 /* this is unexpected, better not proceed */
2024 pr_warn("md: %s: rdev[%pg]: desc_nr(%d) >= freshest(%pg)->sb->max_dev(%u)\n",
2025 mdname(mddev), rdev->bdev, rdev->desc_nr,
2026 freshest->bdev, freshest_max_dev);
2030 role = le16_to_cpu(freshest_sb->dev_roles[rdev->desc_nr]);
2031 pr_debug("md: %s: rdev[%pg]: role=%d(0x%x) according to freshest %pg\n",
2032 mdname(mddev), rdev->bdev, role, role, freshest->bdev);
2034 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2037 case MD_DISK_ROLE_SPARE: /* spare */
2039 case MD_DISK_ROLE_FAULTY: /* faulty */
2040 set_bit(Faulty, &rdev->flags);
2042 case MD_DISK_ROLE_JOURNAL: /* journal device */
2043 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
2044 /* journal device without journal feature */
2045 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
2048 set_bit(Journal, &rdev->flags);
2049 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
2050 rdev->raid_disk = 0;
2053 rdev->saved_raid_disk = role;
2054 if ((le32_to_cpu(sb->feature_map) &
2055 MD_FEATURE_RECOVERY_OFFSET)) {
2056 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
2057 if (!(le32_to_cpu(sb->feature_map) &
2058 MD_FEATURE_RECOVERY_BITMAP))
2059 rdev->saved_raid_disk = -1;
2062 * If the array is FROZEN, then the device can't
2063 * be in_sync with rest of array.
2065 if (!test_bit(MD_RECOVERY_FROZEN,
2067 set_bit(In_sync, &rdev->flags);
2069 rdev->raid_disk = role;
2072 if (sb->devflags & WriteMostly1)
2073 set_bit(WriteMostly, &rdev->flags);
2074 if (sb->devflags & FailFast1)
2075 set_bit(FailFast, &rdev->flags);
2076 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
2077 set_bit(Replacement, &rdev->flags);
2082 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
2084 struct mdp_superblock_1 *sb;
2085 struct md_rdev *rdev2;
2087 /* make rdev->sb match mddev and rdev data. */
2089 sb = page_address(rdev->sb_page);
2091 sb->feature_map = 0;
2093 sb->recovery_offset = cpu_to_le64(0);
2094 memset(sb->pad3, 0, sizeof(sb->pad3));
2096 sb->utime = cpu_to_le64((__u64)mddev->utime);
2097 sb->events = cpu_to_le64(mddev->events);
2099 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
2100 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
2101 sb->resync_offset = cpu_to_le64(MaxSector);
2103 sb->resync_offset = cpu_to_le64(0);
2105 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2107 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2108 sb->size = cpu_to_le64(mddev->dev_sectors);
2109 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2110 sb->level = cpu_to_le32(mddev->level);
2111 sb->layout = cpu_to_le32(mddev->layout);
2112 if (test_bit(FailFast, &rdev->flags))
2113 sb->devflags |= FailFast1;
2115 sb->devflags &= ~FailFast1;
2117 if (test_bit(WriteMostly, &rdev->flags))
2118 sb->devflags |= WriteMostly1;
2120 sb->devflags &= ~WriteMostly1;
2121 sb->data_offset = cpu_to_le64(rdev->data_offset);
2122 sb->data_size = cpu_to_le64(rdev->sectors);
2124 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2125 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2126 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2129 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2130 !test_bit(In_sync, &rdev->flags)) {
2132 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2133 sb->recovery_offset =
2134 cpu_to_le64(rdev->recovery_offset);
2135 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2137 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2139 /* Note: recovery_offset and journal_tail share space */
2140 if (test_bit(Journal, &rdev->flags))
2141 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2142 if (test_bit(Replacement, &rdev->flags))
2144 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2146 if (mddev->reshape_position != MaxSector) {
2147 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2148 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2149 sb->new_layout = cpu_to_le32(mddev->new_layout);
2150 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2151 sb->new_level = cpu_to_le32(mddev->new_level);
2152 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2153 if (mddev->delta_disks == 0 &&
2154 mddev->reshape_backwards)
2156 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2157 if (rdev->new_data_offset != rdev->data_offset) {
2159 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2160 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2161 - rdev->data_offset));
2165 if (mddev_is_clustered(mddev))
2166 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2168 if (rdev->badblocks.count == 0)
2169 /* Nothing to do for bad blocks*/ ;
2170 else if (sb->bblog_offset == 0)
2171 /* Cannot record bad blocks on this device */
2172 md_error(mddev, rdev);
2174 struct badblocks *bb = &rdev->badblocks;
2175 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2177 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2182 seq = read_seqbegin(&bb->lock);
2184 memset(bbp, 0xff, PAGE_SIZE);
2186 for (i = 0 ; i < bb->count ; i++) {
2187 u64 internal_bb = p[i];
2188 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2189 | BB_LEN(internal_bb));
2190 bbp[i] = cpu_to_le64(store_bb);
2193 if (read_seqretry(&bb->lock, seq))
2196 bb->sector = (rdev->sb_start +
2197 (int)le32_to_cpu(sb->bblog_offset));
2198 bb->size = le16_to_cpu(sb->bblog_size);
2203 rdev_for_each(rdev2, mddev)
2204 if (rdev2->desc_nr+1 > max_dev)
2205 max_dev = rdev2->desc_nr+1;
2207 if (max_dev > le32_to_cpu(sb->max_dev)) {
2209 sb->max_dev = cpu_to_le32(max_dev);
2210 rdev->sb_size = max_dev * 2 + 256;
2211 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2212 if (rdev->sb_size & bmask)
2213 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2215 max_dev = le32_to_cpu(sb->max_dev);
2217 for (i=0; i<max_dev;i++)
2218 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2220 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2221 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2223 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2224 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2226 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2228 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2229 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2230 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2233 rdev_for_each(rdev2, mddev) {
2235 if (test_bit(Faulty, &rdev2->flags))
2236 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2237 else if (test_bit(In_sync, &rdev2->flags))
2238 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2239 else if (test_bit(Journal, &rdev2->flags))
2240 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2241 else if (rdev2->raid_disk >= 0)
2242 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2244 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2247 sb->sb_csum = calc_sb_1_csum(sb);
2250 static sector_t super_1_choose_bm_space(sector_t dev_size)
2254 /* if the device is bigger than 8Gig, save 64k for bitmap
2255 * usage, if bigger than 200Gig, save 128k
2257 if (dev_size < 64*2)
2259 else if (dev_size - 64*2 >= 200*1024*1024*2)
2261 else if (dev_size - 4*2 > 8*1024*1024*2)
2268 static unsigned long long
2269 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2271 struct mdp_superblock_1 *sb;
2272 sector_t max_sectors;
2273 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2274 return 0; /* component must fit device */
2275 if (rdev->data_offset != rdev->new_data_offset)
2276 return 0; /* too confusing */
2277 if (rdev->sb_start < rdev->data_offset) {
2278 /* minor versions 1 and 2; superblock before data */
2279 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2280 if (!num_sectors || num_sectors > max_sectors)
2281 num_sectors = max_sectors;
2282 } else if (rdev->mddev->bitmap_info.offset) {
2283 /* minor version 0 with bitmap we can't move */
2286 /* minor version 0; superblock after data */
2287 sector_t sb_start, bm_space;
2288 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2290 /* 8K is for superblock */
2291 sb_start = dev_size - 8*2;
2292 sb_start &= ~(sector_t)(4*2 - 1);
2294 bm_space = super_1_choose_bm_space(dev_size);
2296 /* Space that can be used to store date needs to decrease
2297 * superblock bitmap space and bad block space(4K)
2299 max_sectors = sb_start - bm_space - 4*2;
2301 if (!num_sectors || num_sectors > max_sectors)
2302 num_sectors = max_sectors;
2303 rdev->sb_start = sb_start;
2305 sb = page_address(rdev->sb_page);
2306 sb->data_size = cpu_to_le64(num_sectors);
2307 sb->super_offset = cpu_to_le64(rdev->sb_start);
2308 sb->sb_csum = calc_sb_1_csum(sb);
2310 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2312 } while (md_super_wait(rdev->mddev) < 0);
2318 super_1_allow_new_offset(struct md_rdev *rdev,
2319 unsigned long long new_offset)
2321 /* All necessary checks on new >= old have been done */
2322 struct bitmap *bitmap;
2323 if (new_offset >= rdev->data_offset)
2326 /* with 1.0 metadata, there is no metadata to tread on
2327 * so we can always move back */
2328 if (rdev->mddev->minor_version == 0)
2331 /* otherwise we must be sure not to step on
2332 * any metadata, so stay:
2333 * 36K beyond start of superblock
2334 * beyond end of badblocks
2335 * beyond write-intent bitmap
2337 if (rdev->sb_start + (32+4)*2 > new_offset)
2339 bitmap = rdev->mddev->bitmap;
2340 if (bitmap && !rdev->mddev->bitmap_info.file &&
2341 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2342 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2344 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2350 static struct super_type super_types[] = {
2353 .owner = THIS_MODULE,
2354 .load_super = super_90_load,
2355 .validate_super = super_90_validate,
2356 .sync_super = super_90_sync,
2357 .rdev_size_change = super_90_rdev_size_change,
2358 .allow_new_offset = super_90_allow_new_offset,
2362 .owner = THIS_MODULE,
2363 .load_super = super_1_load,
2364 .validate_super = super_1_validate,
2365 .sync_super = super_1_sync,
2366 .rdev_size_change = super_1_rdev_size_change,
2367 .allow_new_offset = super_1_allow_new_offset,
2371 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2373 if (mddev->sync_super) {
2374 mddev->sync_super(mddev, rdev);
2378 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2380 super_types[mddev->major_version].sync_super(mddev, rdev);
2383 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2385 struct md_rdev *rdev, *rdev2;
2388 rdev_for_each_rcu(rdev, mddev1) {
2389 if (test_bit(Faulty, &rdev->flags) ||
2390 test_bit(Journal, &rdev->flags) ||
2391 rdev->raid_disk == -1)
2393 rdev_for_each_rcu(rdev2, mddev2) {
2394 if (test_bit(Faulty, &rdev2->flags) ||
2395 test_bit(Journal, &rdev2->flags) ||
2396 rdev2->raid_disk == -1)
2398 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2408 static LIST_HEAD(pending_raid_disks);
2411 * Try to register data integrity profile for an mddev
2413 * This is called when an array is started and after a disk has been kicked
2414 * from the array. It only succeeds if all working and active component devices
2415 * are integrity capable with matching profiles.
2417 int md_integrity_register(struct mddev *mddev)
2419 struct md_rdev *rdev, *reference = NULL;
2421 if (list_empty(&mddev->disks))
2422 return 0; /* nothing to do */
2423 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2424 return 0; /* shouldn't register, or already is */
2425 rdev_for_each(rdev, mddev) {
2426 /* skip spares and non-functional disks */
2427 if (test_bit(Faulty, &rdev->flags))
2429 if (rdev->raid_disk < 0)
2432 /* Use the first rdev as the reference */
2436 /* does this rdev's profile match the reference profile? */
2437 if (blk_integrity_compare(reference->bdev->bd_disk,
2438 rdev->bdev->bd_disk) < 0)
2441 if (!reference || !bdev_get_integrity(reference->bdev))
2444 * All component devices are integrity capable and have matching
2445 * profiles, register the common profile for the md device.
2447 blk_integrity_register(mddev->gendisk,
2448 bdev_get_integrity(reference->bdev));
2450 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2451 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2452 (mddev->level != 1 && mddev->level != 10 &&
2453 bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) {
2455 * No need to handle the failure of bioset_integrity_create,
2456 * because the function is called by md_run() -> pers->run(),
2457 * md_run calls bioset_exit -> bioset_integrity_free in case
2460 pr_err("md: failed to create integrity pool for %s\n",
2466 EXPORT_SYMBOL(md_integrity_register);
2469 * Attempt to add an rdev, but only if it is consistent with the current
2472 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2474 struct blk_integrity *bi_mddev;
2476 if (!mddev->gendisk)
2479 bi_mddev = blk_get_integrity(mddev->gendisk);
2481 if (!bi_mddev) /* nothing to do */
2484 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2485 pr_err("%s: incompatible integrity profile for %pg\n",
2486 mdname(mddev), rdev->bdev);
2492 EXPORT_SYMBOL(md_integrity_add_rdev);
2494 static bool rdev_read_only(struct md_rdev *rdev)
2496 return bdev_read_only(rdev->bdev) ||
2497 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2500 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2502 char b[BDEVNAME_SIZE];
2505 /* prevent duplicates */
2506 if (find_rdev(mddev, rdev->bdev->bd_dev))
2509 if (rdev_read_only(rdev) && mddev->pers)
2512 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2513 if (!test_bit(Journal, &rdev->flags) &&
2515 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2517 /* Cannot change size, so fail
2518 * If mddev->level <= 0, then we don't care
2519 * about aligning sizes (e.g. linear)
2521 if (mddev->level > 0)
2524 mddev->dev_sectors = rdev->sectors;
2527 /* Verify rdev->desc_nr is unique.
2528 * If it is -1, assign a free number, else
2529 * check number is not in use
2532 if (rdev->desc_nr < 0) {
2535 choice = mddev->raid_disks;
2536 while (md_find_rdev_nr_rcu(mddev, choice))
2538 rdev->desc_nr = choice;
2540 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2546 if (!test_bit(Journal, &rdev->flags) &&
2547 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2548 pr_warn("md: %s: array is limited to %d devices\n",
2549 mdname(mddev), mddev->max_disks);
2552 snprintf(b, sizeof(b), "%pg", rdev->bdev);
2553 strreplace(b, '/', '!');
2555 rdev->mddev = mddev;
2556 pr_debug("md: bind<%s>\n", b);
2558 if (mddev->raid_disks)
2559 mddev_create_serial_pool(mddev, rdev);
2561 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2564 /* failure here is OK */
2565 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2566 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2567 rdev->sysfs_unack_badblocks =
2568 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2569 rdev->sysfs_badblocks =
2570 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2572 list_add_rcu(&rdev->same_set, &mddev->disks);
2573 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2575 /* May as well allow recovery to be retried once */
2576 mddev->recovery_disabled++;
2581 pr_warn("md: failed to register dev-%s for %s\n",
2583 mddev_destroy_serial_pool(mddev, rdev);
2587 void md_autodetect_dev(dev_t dev);
2589 /* just for claiming the bdev */
2590 static struct md_rdev claim_rdev;
2592 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
2594 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2595 md_rdev_clear(rdev);
2597 if (test_bit(AutoDetected, &rdev->flags))
2598 md_autodetect_dev(rdev->bdev->bd_dev);
2600 bdev_release(rdev->bdev_handle);
2602 kobject_put(&rdev->kobj);
2605 static void md_kick_rdev_from_array(struct md_rdev *rdev)
2607 struct mddev *mddev = rdev->mddev;
2609 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2610 list_del_rcu(&rdev->same_set);
2611 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2612 mddev_destroy_serial_pool(rdev->mddev, rdev);
2613 WRITE_ONCE(rdev->mddev, NULL);
2614 sysfs_remove_link(&rdev->kobj, "block");
2615 sysfs_put(rdev->sysfs_state);
2616 sysfs_put(rdev->sysfs_unack_badblocks);
2617 sysfs_put(rdev->sysfs_badblocks);
2618 rdev->sysfs_state = NULL;
2619 rdev->sysfs_unack_badblocks = NULL;
2620 rdev->sysfs_badblocks = NULL;
2621 rdev->badblocks.count = 0;
2626 * kobject_del() will wait for all in progress writers to be done, where
2627 * reconfig_mutex is held, hence it can't be called under
2628 * reconfig_mutex and it's delayed to mddev_unlock().
2630 list_add(&rdev->same_set, &mddev->deleting);
2633 static void export_array(struct mddev *mddev)
2635 struct md_rdev *rdev;
2637 while (!list_empty(&mddev->disks)) {
2638 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2640 md_kick_rdev_from_array(rdev);
2642 mddev->raid_disks = 0;
2643 mddev->major_version = 0;
2646 static bool set_in_sync(struct mddev *mddev)
2648 lockdep_assert_held(&mddev->lock);
2649 if (!mddev->in_sync) {
2650 mddev->sync_checkers++;
2651 spin_unlock(&mddev->lock);
2652 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2653 spin_lock(&mddev->lock);
2654 if (!mddev->in_sync &&
2655 percpu_ref_is_zero(&mddev->writes_pending)) {
2658 * Ensure ->in_sync is visible before we clear
2662 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2663 sysfs_notify_dirent_safe(mddev->sysfs_state);
2665 if (--mddev->sync_checkers == 0)
2666 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2668 if (mddev->safemode == 1)
2669 mddev->safemode = 0;
2670 return mddev->in_sync;
2673 static void sync_sbs(struct mddev *mddev, int nospares)
2675 /* Update each superblock (in-memory image), but
2676 * if we are allowed to, skip spares which already
2677 * have the right event counter, or have one earlier
2678 * (which would mean they aren't being marked as dirty
2679 * with the rest of the array)
2681 struct md_rdev *rdev;
2682 rdev_for_each(rdev, mddev) {
2683 if (rdev->sb_events == mddev->events ||
2685 rdev->raid_disk < 0 &&
2686 rdev->sb_events+1 == mddev->events)) {
2687 /* Don't update this superblock */
2688 rdev->sb_loaded = 2;
2690 sync_super(mddev, rdev);
2691 rdev->sb_loaded = 1;
2696 static bool does_sb_need_changing(struct mddev *mddev)
2698 struct md_rdev *rdev = NULL, *iter;
2699 struct mdp_superblock_1 *sb;
2702 /* Find a good rdev */
2703 rdev_for_each(iter, mddev)
2704 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2709 /* No good device found. */
2713 sb = page_address(rdev->sb_page);
2714 /* Check if a device has become faulty or a spare become active */
2715 rdev_for_each(rdev, mddev) {
2716 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2717 /* Device activated? */
2718 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2719 !test_bit(Faulty, &rdev->flags))
2721 /* Device turned faulty? */
2722 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2726 /* Check if any mddev parameters have changed */
2727 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2728 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2729 (mddev->layout != le32_to_cpu(sb->layout)) ||
2730 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2731 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2737 void md_update_sb(struct mddev *mddev, int force_change)
2739 struct md_rdev *rdev;
2742 int any_badblocks_changed = 0;
2745 if (!md_is_rdwr(mddev)) {
2747 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2752 if (mddev_is_clustered(mddev)) {
2753 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2755 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2757 ret = md_cluster_ops->metadata_update_start(mddev);
2758 /* Has someone else has updated the sb */
2759 if (!does_sb_need_changing(mddev)) {
2761 md_cluster_ops->metadata_update_cancel(mddev);
2762 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2763 BIT(MD_SB_CHANGE_DEVS) |
2764 BIT(MD_SB_CHANGE_CLEAN));
2770 * First make sure individual recovery_offsets are correct
2771 * curr_resync_completed can only be used during recovery.
2772 * During reshape/resync it might use array-addresses rather
2773 * that device addresses.
2775 rdev_for_each(rdev, mddev) {
2776 if (rdev->raid_disk >= 0 &&
2777 mddev->delta_disks >= 0 &&
2778 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2779 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2780 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2781 !test_bit(Journal, &rdev->flags) &&
2782 !test_bit(In_sync, &rdev->flags) &&
2783 mddev->curr_resync_completed > rdev->recovery_offset)
2784 rdev->recovery_offset = mddev->curr_resync_completed;
2787 if (!mddev->persistent) {
2788 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2789 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2790 if (!mddev->external) {
2791 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2792 rdev_for_each(rdev, mddev) {
2793 if (rdev->badblocks.changed) {
2794 rdev->badblocks.changed = 0;
2795 ack_all_badblocks(&rdev->badblocks);
2796 md_error(mddev, rdev);
2798 clear_bit(Blocked, &rdev->flags);
2799 clear_bit(BlockedBadBlocks, &rdev->flags);
2800 wake_up(&rdev->blocked_wait);
2803 wake_up(&mddev->sb_wait);
2807 spin_lock(&mddev->lock);
2809 mddev->utime = ktime_get_real_seconds();
2811 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2813 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2814 /* just a clean<-> dirty transition, possibly leave spares alone,
2815 * though if events isn't the right even/odd, we will have to do
2821 if (mddev->degraded)
2822 /* If the array is degraded, then skipping spares is both
2823 * dangerous and fairly pointless.
2824 * Dangerous because a device that was removed from the array
2825 * might have a event_count that still looks up-to-date,
2826 * so it can be re-added without a resync.
2827 * Pointless because if there are any spares to skip,
2828 * then a recovery will happen and soon that array won't
2829 * be degraded any more and the spare can go back to sleep then.
2833 sync_req = mddev->in_sync;
2835 /* If this is just a dirty<->clean transition, and the array is clean
2836 * and 'events' is odd, we can roll back to the previous clean state */
2838 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2839 && mddev->can_decrease_events
2840 && mddev->events != 1) {
2842 mddev->can_decrease_events = 0;
2844 /* otherwise we have to go forward and ... */
2846 mddev->can_decrease_events = nospares;
2850 * This 64-bit counter should never wrap.
2851 * Either we are in around ~1 trillion A.C., assuming
2852 * 1 reboot per second, or we have a bug...
2854 WARN_ON(mddev->events == 0);
2856 rdev_for_each(rdev, mddev) {
2857 if (rdev->badblocks.changed)
2858 any_badblocks_changed++;
2859 if (test_bit(Faulty, &rdev->flags))
2860 set_bit(FaultRecorded, &rdev->flags);
2863 sync_sbs(mddev, nospares);
2864 spin_unlock(&mddev->lock);
2866 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2867 mdname(mddev), mddev->in_sync);
2870 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2872 md_bitmap_update_sb(mddev->bitmap);
2873 rdev_for_each(rdev, mddev) {
2874 if (rdev->sb_loaded != 1)
2875 continue; /* no noise on spare devices */
2877 if (!test_bit(Faulty, &rdev->flags)) {
2878 md_super_write(mddev,rdev,
2879 rdev->sb_start, rdev->sb_size,
2881 pr_debug("md: (write) %pg's sb offset: %llu\n",
2883 (unsigned long long)rdev->sb_start);
2884 rdev->sb_events = mddev->events;
2885 if (rdev->badblocks.size) {
2886 md_super_write(mddev, rdev,
2887 rdev->badblocks.sector,
2888 rdev->badblocks.size << 9,
2890 rdev->badblocks.size = 0;
2894 pr_debug("md: %pg (skipping faulty)\n",
2897 if (md_super_wait(mddev) < 0)
2899 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2901 if (mddev_is_clustered(mddev) && ret == 0)
2902 md_cluster_ops->metadata_update_finish(mddev);
2904 if (mddev->in_sync != sync_req ||
2905 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2906 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2907 /* have to write it out again */
2909 wake_up(&mddev->sb_wait);
2910 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2911 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2913 rdev_for_each(rdev, mddev) {
2914 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2915 clear_bit(Blocked, &rdev->flags);
2917 if (any_badblocks_changed)
2918 ack_all_badblocks(&rdev->badblocks);
2919 clear_bit(BlockedBadBlocks, &rdev->flags);
2920 wake_up(&rdev->blocked_wait);
2923 EXPORT_SYMBOL(md_update_sb);
2925 static int add_bound_rdev(struct md_rdev *rdev)
2927 struct mddev *mddev = rdev->mddev;
2929 bool add_journal = test_bit(Journal, &rdev->flags);
2931 if (!mddev->pers->hot_remove_disk || add_journal) {
2932 /* If there is hot_add_disk but no hot_remove_disk
2933 * then added disks for geometry changes,
2934 * and should be added immediately.
2936 super_types[mddev->major_version].
2937 validate_super(mddev, NULL/*freshest*/, rdev);
2938 err = mddev->pers->hot_add_disk(mddev, rdev);
2940 md_kick_rdev_from_array(rdev);
2944 sysfs_notify_dirent_safe(rdev->sysfs_state);
2946 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2947 if (mddev->degraded)
2948 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2949 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2954 /* words written to sysfs files may, or may not, be \n terminated.
2955 * We want to accept with case. For this we use cmd_match.
2957 static int cmd_match(const char *cmd, const char *str)
2959 /* See if cmd, written into a sysfs file, matches
2960 * str. They must either be the same, or cmd can
2961 * have a trailing newline
2963 while (*cmd && *str && *cmd == *str) {
2974 struct rdev_sysfs_entry {
2975 struct attribute attr;
2976 ssize_t (*show)(struct md_rdev *, char *);
2977 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2981 state_show(struct md_rdev *rdev, char *page)
2985 unsigned long flags = READ_ONCE(rdev->flags);
2987 if (test_bit(Faulty, &flags) ||
2988 (!test_bit(ExternalBbl, &flags) &&
2989 rdev->badblocks.unacked_exist))
2990 len += sprintf(page+len, "faulty%s", sep);
2991 if (test_bit(In_sync, &flags))
2992 len += sprintf(page+len, "in_sync%s", sep);
2993 if (test_bit(Journal, &flags))
2994 len += sprintf(page+len, "journal%s", sep);
2995 if (test_bit(WriteMostly, &flags))
2996 len += sprintf(page+len, "write_mostly%s", sep);
2997 if (test_bit(Blocked, &flags) ||
2998 (rdev->badblocks.unacked_exist
2999 && !test_bit(Faulty, &flags)))
3000 len += sprintf(page+len, "blocked%s", sep);
3001 if (!test_bit(Faulty, &flags) &&
3002 !test_bit(Journal, &flags) &&
3003 !test_bit(In_sync, &flags))
3004 len += sprintf(page+len, "spare%s", sep);
3005 if (test_bit(WriteErrorSeen, &flags))
3006 len += sprintf(page+len, "write_error%s", sep);
3007 if (test_bit(WantReplacement, &flags))
3008 len += sprintf(page+len, "want_replacement%s", sep);
3009 if (test_bit(Replacement, &flags))
3010 len += sprintf(page+len, "replacement%s", sep);
3011 if (test_bit(ExternalBbl, &flags))
3012 len += sprintf(page+len, "external_bbl%s", sep);
3013 if (test_bit(FailFast, &flags))
3014 len += sprintf(page+len, "failfast%s", sep);
3019 return len+sprintf(page+len, "\n");
3023 state_store(struct md_rdev *rdev, const char *buf, size_t len)
3026 * faulty - simulates an error
3027 * remove - disconnects the device
3028 * writemostly - sets write_mostly
3029 * -writemostly - clears write_mostly
3030 * blocked - sets the Blocked flags
3031 * -blocked - clears the Blocked and possibly simulates an error
3032 * insync - sets Insync providing device isn't active
3033 * -insync - clear Insync for a device with a slot assigned,
3034 * so that it gets rebuilt based on bitmap
3035 * write_error - sets WriteErrorSeen
3036 * -write_error - clears WriteErrorSeen
3037 * {,-}failfast - set/clear FailFast
3040 struct mddev *mddev = rdev->mddev;
3042 bool need_update_sb = false;
3044 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
3045 md_error(rdev->mddev, rdev);
3047 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
3051 } else if (cmd_match(buf, "remove")) {
3052 if (rdev->mddev->pers) {
3053 clear_bit(Blocked, &rdev->flags);
3054 remove_and_add_spares(rdev->mddev, rdev);
3056 if (rdev->raid_disk >= 0)
3060 if (mddev_is_clustered(mddev))
3061 err = md_cluster_ops->remove_disk(mddev, rdev);
3064 md_kick_rdev_from_array(rdev);
3066 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3070 } else if (cmd_match(buf, "writemostly")) {
3071 set_bit(WriteMostly, &rdev->flags);
3072 mddev_create_serial_pool(rdev->mddev, rdev);
3073 need_update_sb = true;
3075 } else if (cmd_match(buf, "-writemostly")) {
3076 mddev_destroy_serial_pool(rdev->mddev, rdev);
3077 clear_bit(WriteMostly, &rdev->flags);
3078 need_update_sb = true;
3080 } else if (cmd_match(buf, "blocked")) {
3081 set_bit(Blocked, &rdev->flags);
3083 } else if (cmd_match(buf, "-blocked")) {
3084 if (!test_bit(Faulty, &rdev->flags) &&
3085 !test_bit(ExternalBbl, &rdev->flags) &&
3086 rdev->badblocks.unacked_exist) {
3087 /* metadata handler doesn't understand badblocks,
3088 * so we need to fail the device
3090 md_error(rdev->mddev, rdev);
3092 clear_bit(Blocked, &rdev->flags);
3093 clear_bit(BlockedBadBlocks, &rdev->flags);
3094 wake_up(&rdev->blocked_wait);
3095 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3098 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3099 set_bit(In_sync, &rdev->flags);
3101 } else if (cmd_match(buf, "failfast")) {
3102 set_bit(FailFast, &rdev->flags);
3103 need_update_sb = true;
3105 } else if (cmd_match(buf, "-failfast")) {
3106 clear_bit(FailFast, &rdev->flags);
3107 need_update_sb = true;
3109 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3110 !test_bit(Journal, &rdev->flags)) {
3111 if (rdev->mddev->pers == NULL) {
3112 clear_bit(In_sync, &rdev->flags);
3113 rdev->saved_raid_disk = rdev->raid_disk;
3114 rdev->raid_disk = -1;
3117 } else if (cmd_match(buf, "write_error")) {
3118 set_bit(WriteErrorSeen, &rdev->flags);
3120 } else if (cmd_match(buf, "-write_error")) {
3121 clear_bit(WriteErrorSeen, &rdev->flags);
3123 } else if (cmd_match(buf, "want_replacement")) {
3124 /* Any non-spare device that is not a replacement can
3125 * become want_replacement at any time, but we then need to
3126 * check if recovery is needed.
3128 if (rdev->raid_disk >= 0 &&
3129 !test_bit(Journal, &rdev->flags) &&
3130 !test_bit(Replacement, &rdev->flags))
3131 set_bit(WantReplacement, &rdev->flags);
3132 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3134 } else if (cmd_match(buf, "-want_replacement")) {
3135 /* Clearing 'want_replacement' is always allowed.
3136 * Once replacements starts it is too late though.
3139 clear_bit(WantReplacement, &rdev->flags);
3140 } else if (cmd_match(buf, "replacement")) {
3141 /* Can only set a device as a replacement when array has not
3142 * yet been started. Once running, replacement is automatic
3143 * from spares, or by assigning 'slot'.
3145 if (rdev->mddev->pers)
3148 set_bit(Replacement, &rdev->flags);
3151 } else if (cmd_match(buf, "-replacement")) {
3152 /* Similarly, can only clear Replacement before start */
3153 if (rdev->mddev->pers)
3156 clear_bit(Replacement, &rdev->flags);
3159 } else if (cmd_match(buf, "re-add")) {
3160 if (!rdev->mddev->pers)
3162 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3163 rdev->saved_raid_disk >= 0) {
3164 /* clear_bit is performed _after_ all the devices
3165 * have their local Faulty bit cleared. If any writes
3166 * happen in the meantime in the local node, they
3167 * will land in the local bitmap, which will be synced
3168 * by this node eventually
3170 if (!mddev_is_clustered(rdev->mddev) ||
3171 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3172 clear_bit(Faulty, &rdev->flags);
3173 err = add_bound_rdev(rdev);
3177 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3178 set_bit(ExternalBbl, &rdev->flags);
3179 rdev->badblocks.shift = 0;
3181 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3182 clear_bit(ExternalBbl, &rdev->flags);
3186 md_update_sb(mddev, 1);
3188 sysfs_notify_dirent_safe(rdev->sysfs_state);
3189 return err ? err : len;
3191 static struct rdev_sysfs_entry rdev_state =
3192 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3195 errors_show(struct md_rdev *rdev, char *page)
3197 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3201 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3206 rv = kstrtouint(buf, 10, &n);
3209 atomic_set(&rdev->corrected_errors, n);
3212 static struct rdev_sysfs_entry rdev_errors =
3213 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3216 slot_show(struct md_rdev *rdev, char *page)
3218 if (test_bit(Journal, &rdev->flags))
3219 return sprintf(page, "journal\n");
3220 else if (rdev->raid_disk < 0)
3221 return sprintf(page, "none\n");
3223 return sprintf(page, "%d\n", rdev->raid_disk);
3227 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3232 if (test_bit(Journal, &rdev->flags))
3234 if (strncmp(buf, "none", 4)==0)
3237 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3244 if (rdev->mddev->pers && slot == -1) {
3245 /* Setting 'slot' on an active array requires also
3246 * updating the 'rd%d' link, and communicating
3247 * with the personality with ->hot_*_disk.
3248 * For now we only support removing
3249 * failed/spare devices. This normally happens automatically,
3250 * but not when the metadata is externally managed.
3252 if (rdev->raid_disk == -1)
3254 /* personality does all needed checks */
3255 if (rdev->mddev->pers->hot_remove_disk == NULL)
3257 clear_bit(Blocked, &rdev->flags);
3258 remove_and_add_spares(rdev->mddev, rdev);
3259 if (rdev->raid_disk >= 0)
3261 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3262 } else if (rdev->mddev->pers) {
3263 /* Activating a spare .. or possibly reactivating
3264 * if we ever get bitmaps working here.
3268 if (rdev->raid_disk != -1)
3271 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3274 if (rdev->mddev->pers->hot_add_disk == NULL)
3277 if (slot >= rdev->mddev->raid_disks &&
3278 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3281 rdev->raid_disk = slot;
3282 if (test_bit(In_sync, &rdev->flags))
3283 rdev->saved_raid_disk = slot;
3285 rdev->saved_raid_disk = -1;
3286 clear_bit(In_sync, &rdev->flags);
3287 clear_bit(Bitmap_sync, &rdev->flags);
3288 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3290 rdev->raid_disk = -1;
3293 sysfs_notify_dirent_safe(rdev->sysfs_state);
3294 /* failure here is OK */;
3295 sysfs_link_rdev(rdev->mddev, rdev);
3296 /* don't wakeup anyone, leave that to userspace. */
3298 if (slot >= rdev->mddev->raid_disks &&
3299 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3301 rdev->raid_disk = slot;
3302 /* assume it is working */
3303 clear_bit(Faulty, &rdev->flags);
3304 clear_bit(WriteMostly, &rdev->flags);
3305 set_bit(In_sync, &rdev->flags);
3306 sysfs_notify_dirent_safe(rdev->sysfs_state);
3311 static struct rdev_sysfs_entry rdev_slot =
3312 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3315 offset_show(struct md_rdev *rdev, char *page)
3317 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3321 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3323 unsigned long long offset;
3324 if (kstrtoull(buf, 10, &offset) < 0)
3326 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3328 if (rdev->sectors && rdev->mddev->external)
3329 /* Must set offset before size, so overlap checks
3332 rdev->data_offset = offset;
3333 rdev->new_data_offset = offset;
3337 static struct rdev_sysfs_entry rdev_offset =
3338 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3340 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3342 return sprintf(page, "%llu\n",
3343 (unsigned long long)rdev->new_data_offset);
3346 static ssize_t new_offset_store(struct md_rdev *rdev,
3347 const char *buf, size_t len)
3349 unsigned long long new_offset;
3350 struct mddev *mddev = rdev->mddev;
3352 if (kstrtoull(buf, 10, &new_offset) < 0)
3355 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3357 if (new_offset == rdev->data_offset)
3358 /* reset is always permitted */
3360 else if (new_offset > rdev->data_offset) {
3361 /* must not push array size beyond rdev_sectors */
3362 if (new_offset - rdev->data_offset
3363 + mddev->dev_sectors > rdev->sectors)
3366 /* Metadata worries about other space details. */
3368 /* decreasing the offset is inconsistent with a backwards
3371 if (new_offset < rdev->data_offset &&
3372 mddev->reshape_backwards)
3374 /* Increasing offset is inconsistent with forwards
3375 * reshape. reshape_direction should be set to
3376 * 'backwards' first.
3378 if (new_offset > rdev->data_offset &&
3379 !mddev->reshape_backwards)
3382 if (mddev->pers && mddev->persistent &&
3383 !super_types[mddev->major_version]
3384 .allow_new_offset(rdev, new_offset))
3386 rdev->new_data_offset = new_offset;
3387 if (new_offset > rdev->data_offset)
3388 mddev->reshape_backwards = 1;
3389 else if (new_offset < rdev->data_offset)
3390 mddev->reshape_backwards = 0;
3394 static struct rdev_sysfs_entry rdev_new_offset =
3395 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3398 rdev_size_show(struct md_rdev *rdev, char *page)
3400 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3403 static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
3405 /* check if two start/length pairs overlap */
3406 if (a->data_offset + a->sectors <= b->data_offset)
3408 if (b->data_offset + b->sectors <= a->data_offset)
3413 static bool md_rdev_overlaps(struct md_rdev *rdev)
3415 struct mddev *mddev;
3416 struct md_rdev *rdev2;
3418 spin_lock(&all_mddevs_lock);
3419 list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
3420 if (test_bit(MD_DELETED, &mddev->flags))
3422 rdev_for_each(rdev2, mddev) {
3423 if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
3424 md_rdevs_overlap(rdev, rdev2)) {
3425 spin_unlock(&all_mddevs_lock);
3430 spin_unlock(&all_mddevs_lock);
3434 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3436 unsigned long long blocks;
3439 if (kstrtoull(buf, 10, &blocks) < 0)
3442 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3443 return -EINVAL; /* sector conversion overflow */
3446 if (new != blocks * 2)
3447 return -EINVAL; /* unsigned long long to sector_t overflow */
3454 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3456 struct mddev *my_mddev = rdev->mddev;
3457 sector_t oldsectors = rdev->sectors;
3460 if (test_bit(Journal, &rdev->flags))
3462 if (strict_blocks_to_sectors(buf, §ors) < 0)
3464 if (rdev->data_offset != rdev->new_data_offset)
3465 return -EINVAL; /* too confusing */
3466 if (my_mddev->pers && rdev->raid_disk >= 0) {
3467 if (my_mddev->persistent) {
3468 sectors = super_types[my_mddev->major_version].
3469 rdev_size_change(rdev, sectors);
3472 } else if (!sectors)
3473 sectors = bdev_nr_sectors(rdev->bdev) -
3475 if (!my_mddev->pers->resize)
3476 /* Cannot change size for RAID0 or Linear etc */
3479 if (sectors < my_mddev->dev_sectors)
3480 return -EINVAL; /* component must fit device */
3482 rdev->sectors = sectors;
3485 * Check that all other rdevs with the same bdev do not overlap. This
3486 * check does not provide a hard guarantee, it just helps avoid
3487 * dangerous mistakes.
3489 if (sectors > oldsectors && my_mddev->external &&
3490 md_rdev_overlaps(rdev)) {
3492 * Someone else could have slipped in a size change here, but
3493 * doing so is just silly. We put oldsectors back because we
3494 * know it is safe, and trust userspace not to race with itself.
3496 rdev->sectors = oldsectors;
3502 static struct rdev_sysfs_entry rdev_size =
3503 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3505 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3507 unsigned long long recovery_start = rdev->recovery_offset;
3509 if (test_bit(In_sync, &rdev->flags) ||
3510 recovery_start == MaxSector)
3511 return sprintf(page, "none\n");
3513 return sprintf(page, "%llu\n", recovery_start);
3516 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3518 unsigned long long recovery_start;
3520 if (cmd_match(buf, "none"))
3521 recovery_start = MaxSector;
3522 else if (kstrtoull(buf, 10, &recovery_start))
3525 if (rdev->mddev->pers &&
3526 rdev->raid_disk >= 0)
3529 rdev->recovery_offset = recovery_start;
3530 if (recovery_start == MaxSector)
3531 set_bit(In_sync, &rdev->flags);
3533 clear_bit(In_sync, &rdev->flags);
3537 static struct rdev_sysfs_entry rdev_recovery_start =
3538 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3540 /* sysfs access to bad-blocks list.
3541 * We present two files.
3542 * 'bad-blocks' lists sector numbers and lengths of ranges that
3543 * are recorded as bad. The list is truncated to fit within
3544 * the one-page limit of sysfs.
3545 * Writing "sector length" to this file adds an acknowledged
3547 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3548 * been acknowledged. Writing to this file adds bad blocks
3549 * without acknowledging them. This is largely for testing.
3551 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3553 return badblocks_show(&rdev->badblocks, page, 0);
3555 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3557 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3558 /* Maybe that ack was all we needed */
3559 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3560 wake_up(&rdev->blocked_wait);
3563 static struct rdev_sysfs_entry rdev_bad_blocks =
3564 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3566 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3568 return badblocks_show(&rdev->badblocks, page, 1);
3570 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3572 return badblocks_store(&rdev->badblocks, page, len, 1);
3574 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3575 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3578 ppl_sector_show(struct md_rdev *rdev, char *page)
3580 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3584 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3586 unsigned long long sector;
3588 if (kstrtoull(buf, 10, §or) < 0)
3590 if (sector != (sector_t)sector)
3593 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3594 rdev->raid_disk >= 0)
3597 if (rdev->mddev->persistent) {
3598 if (rdev->mddev->major_version == 0)
3600 if ((sector > rdev->sb_start &&
3601 sector - rdev->sb_start > S16_MAX) ||
3602 (sector < rdev->sb_start &&
3603 rdev->sb_start - sector > -S16_MIN))
3605 rdev->ppl.offset = sector - rdev->sb_start;
3606 } else if (!rdev->mddev->external) {
3609 rdev->ppl.sector = sector;
3613 static struct rdev_sysfs_entry rdev_ppl_sector =
3614 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3617 ppl_size_show(struct md_rdev *rdev, char *page)
3619 return sprintf(page, "%u\n", rdev->ppl.size);
3623 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3627 if (kstrtouint(buf, 10, &size) < 0)
3630 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3631 rdev->raid_disk >= 0)
3634 if (rdev->mddev->persistent) {
3635 if (rdev->mddev->major_version == 0)
3639 } else if (!rdev->mddev->external) {
3642 rdev->ppl.size = size;
3646 static struct rdev_sysfs_entry rdev_ppl_size =
3647 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3649 static struct attribute *rdev_default_attrs[] = {
3654 &rdev_new_offset.attr,
3656 &rdev_recovery_start.attr,
3657 &rdev_bad_blocks.attr,
3658 &rdev_unack_bad_blocks.attr,
3659 &rdev_ppl_sector.attr,
3660 &rdev_ppl_size.attr,
3663 ATTRIBUTE_GROUPS(rdev_default);
3665 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3667 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3668 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3674 return entry->show(rdev, page);
3678 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3679 const char *page, size_t length)
3681 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3682 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3683 struct kernfs_node *kn = NULL;
3684 bool suspend = false;
3686 struct mddev *mddev = READ_ONCE(rdev->mddev);
3690 if (!capable(CAP_SYS_ADMIN))
3695 if (entry->store == state_store) {
3696 if (cmd_match(page, "remove"))
3697 kn = sysfs_break_active_protection(kobj, attr);
3698 if (cmd_match(page, "remove") || cmd_match(page, "re-add") ||
3699 cmd_match(page, "writemostly") ||
3700 cmd_match(page, "-writemostly"))
3704 rv = suspend ? mddev_suspend_and_lock(mddev) : mddev_lock(mddev);
3706 if (rdev->mddev == NULL)
3709 rv = entry->store(rdev, page, length);
3710 suspend ? mddev_unlock_and_resume(mddev) : mddev_unlock(mddev);
3714 sysfs_unbreak_active_protection(kn);
3719 static void rdev_free(struct kobject *ko)
3721 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3724 static const struct sysfs_ops rdev_sysfs_ops = {
3725 .show = rdev_attr_show,
3726 .store = rdev_attr_store,
3728 static const struct kobj_type rdev_ktype = {
3729 .release = rdev_free,
3730 .sysfs_ops = &rdev_sysfs_ops,
3731 .default_groups = rdev_default_groups,
3734 int md_rdev_init(struct md_rdev *rdev)
3737 rdev->saved_raid_disk = -1;
3738 rdev->raid_disk = -1;
3740 rdev->data_offset = 0;
3741 rdev->new_data_offset = 0;
3742 rdev->sb_events = 0;
3743 rdev->last_read_error = 0;
3744 rdev->sb_loaded = 0;
3745 rdev->bb_page = NULL;
3746 atomic_set(&rdev->nr_pending, 0);
3747 atomic_set(&rdev->read_errors, 0);
3748 atomic_set(&rdev->corrected_errors, 0);
3750 INIT_LIST_HEAD(&rdev->same_set);
3751 init_waitqueue_head(&rdev->blocked_wait);
3753 /* Add space to store bad block list.
3754 * This reserves the space even on arrays where it cannot
3755 * be used - I wonder if that matters
3757 return badblocks_init(&rdev->badblocks, 0);
3759 EXPORT_SYMBOL_GPL(md_rdev_init);
3762 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3764 * mark the device faulty if:
3766 * - the device is nonexistent (zero size)
3767 * - the device has no valid superblock
3769 * a faulty rdev _never_ has rdev->sb set.
3771 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3773 struct md_rdev *rdev;
3777 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3779 return ERR_PTR(-ENOMEM);
3781 err = md_rdev_init(rdev);
3784 err = alloc_disk_sb(rdev);
3786 goto out_clear_rdev;
3788 rdev->bdev_handle = bdev_open_by_dev(newdev,
3789 BLK_OPEN_READ | BLK_OPEN_WRITE,
3790 super_format == -2 ? &claim_rdev : rdev, NULL);
3791 if (IS_ERR(rdev->bdev_handle)) {
3792 pr_warn("md: could not open device unknown-block(%u,%u).\n",
3793 MAJOR(newdev), MINOR(newdev));
3794 err = PTR_ERR(rdev->bdev_handle);
3795 goto out_clear_rdev;
3797 rdev->bdev = rdev->bdev_handle->bdev;
3799 kobject_init(&rdev->kobj, &rdev_ktype);
3801 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3803 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3806 goto out_blkdev_put;
3809 if (super_format >= 0) {
3810 err = super_types[super_format].
3811 load_super(rdev, NULL, super_minor);
3812 if (err == -EINVAL) {
3813 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3815 super_format, super_minor);
3816 goto out_blkdev_put;
3819 pr_warn("md: could not read %pg's sb, not importing!\n",
3821 goto out_blkdev_put;
3828 bdev_release(rdev->bdev_handle);
3830 md_rdev_clear(rdev);
3833 return ERR_PTR(err);
3837 * Check a full RAID array for plausibility
3840 static int analyze_sbs(struct mddev *mddev)
3843 struct md_rdev *rdev, *freshest, *tmp;
3846 rdev_for_each_safe(rdev, tmp, mddev)
3847 switch (super_types[mddev->major_version].
3848 load_super(rdev, freshest, mddev->minor_version)) {
3855 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3857 md_kick_rdev_from_array(rdev);
3860 /* Cannot find a valid fresh disk */
3862 pr_warn("md: cannot find a valid disk\n");
3866 super_types[mddev->major_version].
3867 validate_super(mddev, NULL/*freshest*/, freshest);
3870 rdev_for_each_safe(rdev, tmp, mddev) {
3871 if (mddev->max_disks &&
3872 (rdev->desc_nr >= mddev->max_disks ||
3873 i > mddev->max_disks)) {
3874 pr_warn("md: %s: %pg: only %d devices permitted\n",
3875 mdname(mddev), rdev->bdev,
3877 md_kick_rdev_from_array(rdev);
3880 if (rdev != freshest) {
3881 if (super_types[mddev->major_version].
3882 validate_super(mddev, freshest, rdev)) {
3883 pr_warn("md: kicking non-fresh %pg from array!\n",
3885 md_kick_rdev_from_array(rdev);
3889 if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3890 !test_bit(Journal, &rdev->flags)) {
3891 rdev->raid_disk = -1;
3892 clear_bit(In_sync, &rdev->flags);
3899 /* Read a fixed-point number.
3900 * Numbers in sysfs attributes should be in "standard" units where
3901 * possible, so time should be in seconds.
3902 * However we internally use a a much smaller unit such as
3903 * milliseconds or jiffies.
3904 * This function takes a decimal number with a possible fractional
3905 * component, and produces an integer which is the result of
3906 * multiplying that number by 10^'scale'.
3907 * all without any floating-point arithmetic.
3909 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3911 unsigned long result = 0;
3913 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3916 else if (decimals < scale) {
3919 result = result * 10 + value;
3931 *res = result * int_pow(10, scale - decimals);
3936 safe_delay_show(struct mddev *mddev, char *page)
3938 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3940 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3943 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3947 if (mddev_is_clustered(mddev)) {
3948 pr_warn("md: Safemode is disabled for clustered mode\n");
3952 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3955 mddev->safemode_delay = 0;
3957 unsigned long old_delay = mddev->safemode_delay;
3958 unsigned long new_delay = (msec*HZ)/1000;
3962 mddev->safemode_delay = new_delay;
3963 if (new_delay < old_delay || old_delay == 0)
3964 mod_timer(&mddev->safemode_timer, jiffies+1);
3968 static struct md_sysfs_entry md_safe_delay =
3969 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3972 level_show(struct mddev *mddev, char *page)
3974 struct md_personality *p;
3976 spin_lock(&mddev->lock);
3979 ret = sprintf(page, "%s\n", p->name);
3980 else if (mddev->clevel[0])
3981 ret = sprintf(page, "%s\n", mddev->clevel);
3982 else if (mddev->level != LEVEL_NONE)
3983 ret = sprintf(page, "%d\n", mddev->level);
3986 spin_unlock(&mddev->lock);
3991 level_store(struct mddev *mddev, const char *buf, size_t len)
3996 struct md_personality *pers, *oldpers;
3998 void *priv, *oldpriv;
3999 struct md_rdev *rdev;
4001 if (slen == 0 || slen >= sizeof(clevel))
4004 rv = mddev_suspend_and_lock(mddev);
4008 if (mddev->pers == NULL) {
4009 memcpy(mddev->clevel, buf, slen);
4010 if (mddev->clevel[slen-1] == '\n')
4012 mddev->clevel[slen] = 0;
4013 mddev->level = LEVEL_NONE;
4018 if (!md_is_rdwr(mddev))
4021 /* request to change the personality. Need to ensure:
4022 * - array is not engaged in resync/recovery/reshape
4023 * - old personality can be suspended
4024 * - new personality will access other array.
4028 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4029 mddev->reshape_position != MaxSector ||
4030 mddev->sysfs_active)
4034 if (!mddev->pers->quiesce) {
4035 pr_warn("md: %s: %s does not support online personality change\n",
4036 mdname(mddev), mddev->pers->name);
4040 /* Now find the new personality */
4041 memcpy(clevel, buf, slen);
4042 if (clevel[slen-1] == '\n')
4045 if (kstrtol(clevel, 10, &level))
4048 if (request_module("md-%s", clevel) != 0)
4049 request_module("md-level-%s", clevel);
4050 spin_lock(&pers_lock);
4051 pers = find_pers(level, clevel);
4052 if (!pers || !try_module_get(pers->owner)) {
4053 spin_unlock(&pers_lock);
4054 pr_warn("md: personality %s not loaded\n", clevel);
4058 spin_unlock(&pers_lock);
4060 if (pers == mddev->pers) {
4061 /* Nothing to do! */
4062 module_put(pers->owner);
4066 if (!pers->takeover) {
4067 module_put(pers->owner);
4068 pr_warn("md: %s: %s does not support personality takeover\n",
4069 mdname(mddev), clevel);
4074 rdev_for_each(rdev, mddev)
4075 rdev->new_raid_disk = rdev->raid_disk;
4077 /* ->takeover must set new_* and/or delta_disks
4078 * if it succeeds, and may set them when it fails.
4080 priv = pers->takeover(mddev);
4082 mddev->new_level = mddev->level;
4083 mddev->new_layout = mddev->layout;
4084 mddev->new_chunk_sectors = mddev->chunk_sectors;
4085 mddev->raid_disks -= mddev->delta_disks;
4086 mddev->delta_disks = 0;
4087 mddev->reshape_backwards = 0;
4088 module_put(pers->owner);
4089 pr_warn("md: %s: %s would not accept array\n",
4090 mdname(mddev), clevel);
4095 /* Looks like we have a winner */
4096 mddev_detach(mddev);
4098 spin_lock(&mddev->lock);
4099 oldpers = mddev->pers;
4100 oldpriv = mddev->private;
4102 mddev->private = priv;
4103 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4104 mddev->level = mddev->new_level;
4105 mddev->layout = mddev->new_layout;
4106 mddev->chunk_sectors = mddev->new_chunk_sectors;
4107 mddev->delta_disks = 0;
4108 mddev->reshape_backwards = 0;
4109 mddev->degraded = 0;
4110 spin_unlock(&mddev->lock);
4112 if (oldpers->sync_request == NULL &&
4114 /* We are converting from a no-redundancy array
4115 * to a redundancy array and metadata is managed
4116 * externally so we need to be sure that writes
4117 * won't block due to a need to transition
4119 * until external management is started.
4122 mddev->safemode_delay = 0;
4123 mddev->safemode = 0;
4126 oldpers->free(mddev, oldpriv);
4128 if (oldpers->sync_request == NULL &&
4129 pers->sync_request != NULL) {
4130 /* need to add the md_redundancy_group */
4131 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4132 pr_warn("md: cannot register extra attributes for %s\n",
4134 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4135 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4136 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4138 if (oldpers->sync_request != NULL &&
4139 pers->sync_request == NULL) {
4140 /* need to remove the md_redundancy_group */
4141 if (mddev->to_remove == NULL)
4142 mddev->to_remove = &md_redundancy_group;
4145 module_put(oldpers->owner);
4147 rdev_for_each(rdev, mddev) {
4148 if (rdev->raid_disk < 0)
4150 if (rdev->new_raid_disk >= mddev->raid_disks)
4151 rdev->new_raid_disk = -1;
4152 if (rdev->new_raid_disk == rdev->raid_disk)
4154 sysfs_unlink_rdev(mddev, rdev);
4156 rdev_for_each(rdev, mddev) {
4157 if (rdev->raid_disk < 0)
4159 if (rdev->new_raid_disk == rdev->raid_disk)
4161 rdev->raid_disk = rdev->new_raid_disk;
4162 if (rdev->raid_disk < 0)
4163 clear_bit(In_sync, &rdev->flags);
4165 if (sysfs_link_rdev(mddev, rdev))
4166 pr_warn("md: cannot register rd%d for %s after level change\n",
4167 rdev->raid_disk, mdname(mddev));
4171 if (pers->sync_request == NULL) {
4172 /* this is now an array without redundancy, so
4173 * it must always be in_sync
4176 del_timer_sync(&mddev->safemode_timer);
4178 blk_set_stacking_limits(&mddev->queue->limits);
4180 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4182 md_update_sb(mddev, 1);
4183 sysfs_notify_dirent_safe(mddev->sysfs_level);
4187 mddev_unlock_and_resume(mddev);
4191 static struct md_sysfs_entry md_level =
4192 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4195 layout_show(struct mddev *mddev, char *page)
4197 /* just a number, not meaningful for all levels */
4198 if (mddev->reshape_position != MaxSector &&
4199 mddev->layout != mddev->new_layout)
4200 return sprintf(page, "%d (%d)\n",
4201 mddev->new_layout, mddev->layout);
4202 return sprintf(page, "%d\n", mddev->layout);
4206 layout_store(struct mddev *mddev, const char *buf, size_t len)
4211 err = kstrtouint(buf, 10, &n);
4214 err = mddev_lock(mddev);
4219 if (mddev->pers->check_reshape == NULL)
4221 else if (!md_is_rdwr(mddev))
4224 mddev->new_layout = n;
4225 err = mddev->pers->check_reshape(mddev);
4227 mddev->new_layout = mddev->layout;
4230 mddev->new_layout = n;
4231 if (mddev->reshape_position == MaxSector)
4234 mddev_unlock(mddev);
4237 static struct md_sysfs_entry md_layout =
4238 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4241 raid_disks_show(struct mddev *mddev, char *page)
4243 if (mddev->raid_disks == 0)
4245 if (mddev->reshape_position != MaxSector &&
4246 mddev->delta_disks != 0)
4247 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4248 mddev->raid_disks - mddev->delta_disks);
4249 return sprintf(page, "%d\n", mddev->raid_disks);
4252 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4255 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4260 err = kstrtouint(buf, 10, &n);
4264 err = mddev_lock(mddev);
4268 err = update_raid_disks(mddev, n);
4269 else if (mddev->reshape_position != MaxSector) {
4270 struct md_rdev *rdev;
4271 int olddisks = mddev->raid_disks - mddev->delta_disks;
4274 rdev_for_each(rdev, mddev) {
4276 rdev->data_offset < rdev->new_data_offset)
4279 rdev->data_offset > rdev->new_data_offset)
4283 mddev->delta_disks = n - olddisks;
4284 mddev->raid_disks = n;
4285 mddev->reshape_backwards = (mddev->delta_disks < 0);
4287 mddev->raid_disks = n;
4289 mddev_unlock(mddev);
4290 return err ? err : len;
4292 static struct md_sysfs_entry md_raid_disks =
4293 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4296 uuid_show(struct mddev *mddev, char *page)
4298 return sprintf(page, "%pU\n", mddev->uuid);
4300 static struct md_sysfs_entry md_uuid =
4301 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4304 chunk_size_show(struct mddev *mddev, char *page)
4306 if (mddev->reshape_position != MaxSector &&
4307 mddev->chunk_sectors != mddev->new_chunk_sectors)
4308 return sprintf(page, "%d (%d)\n",
4309 mddev->new_chunk_sectors << 9,
4310 mddev->chunk_sectors << 9);
4311 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4315 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4320 err = kstrtoul(buf, 10, &n);
4324 err = mddev_lock(mddev);
4328 if (mddev->pers->check_reshape == NULL)
4330 else if (!md_is_rdwr(mddev))
4333 mddev->new_chunk_sectors = n >> 9;
4334 err = mddev->pers->check_reshape(mddev);
4336 mddev->new_chunk_sectors = mddev->chunk_sectors;
4339 mddev->new_chunk_sectors = n >> 9;
4340 if (mddev->reshape_position == MaxSector)
4341 mddev->chunk_sectors = n >> 9;
4343 mddev_unlock(mddev);
4346 static struct md_sysfs_entry md_chunk_size =
4347 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4350 resync_start_show(struct mddev *mddev, char *page)
4352 if (mddev->recovery_cp == MaxSector)
4353 return sprintf(page, "none\n");
4354 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4358 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4360 unsigned long long n;
4363 if (cmd_match(buf, "none"))
4366 err = kstrtoull(buf, 10, &n);
4369 if (n != (sector_t)n)
4373 err = mddev_lock(mddev);
4376 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4380 mddev->recovery_cp = n;
4382 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4384 mddev_unlock(mddev);
4387 static struct md_sysfs_entry md_resync_start =
4388 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4389 resync_start_show, resync_start_store);
4392 * The array state can be:
4395 * No devices, no size, no level
4396 * Equivalent to STOP_ARRAY ioctl
4398 * May have some settings, but array is not active
4399 * all IO results in error
4400 * When written, doesn't tear down array, but just stops it
4401 * suspended (not supported yet)
4402 * All IO requests will block. The array can be reconfigured.
4403 * Writing this, if accepted, will block until array is quiescent
4405 * no resync can happen. no superblocks get written.
4406 * write requests fail
4408 * like readonly, but behaves like 'clean' on a write request.
4410 * clean - no pending writes, but otherwise active.
4411 * When written to inactive array, starts without resync
4412 * If a write request arrives then
4413 * if metadata is known, mark 'dirty' and switch to 'active'.
4414 * if not known, block and switch to write-pending
4415 * If written to an active array that has pending writes, then fails.
4417 * fully active: IO and resync can be happening.
4418 * When written to inactive array, starts with resync
4421 * clean, but writes are blocked waiting for 'active' to be written.
4424 * like active, but no writes have been seen for a while (100msec).
4427 * Array is failed. It's useful because mounted-arrays aren't stopped
4428 * when array is failed, so this state will at least alert the user that
4429 * something is wrong.
4431 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4432 write_pending, active_idle, broken, bad_word};
4433 static char *array_states[] = {
4434 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4435 "write-pending", "active-idle", "broken", NULL };
4437 static int match_word(const char *word, char **list)
4440 for (n=0; list[n]; n++)
4441 if (cmd_match(word, list[n]))
4447 array_state_show(struct mddev *mddev, char *page)
4449 enum array_state st = inactive;
4451 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4460 spin_lock(&mddev->lock);
4461 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4463 else if (mddev->in_sync)
4465 else if (mddev->safemode)
4469 spin_unlock(&mddev->lock);
4472 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4475 if (list_empty(&mddev->disks) &&
4476 mddev->raid_disks == 0 &&
4477 mddev->dev_sectors == 0)
4482 return sprintf(page, "%s\n", array_states[st]);
4485 static int do_md_stop(struct mddev *mddev, int ro);
4486 static int md_set_readonly(struct mddev *mddev);
4487 static int restart_array(struct mddev *mddev);
4490 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4493 enum array_state st = match_word(buf, array_states);
4495 /* No lock dependent actions */
4497 case suspended: /* not supported yet */
4498 case write_pending: /* cannot be set */
4499 case active_idle: /* cannot be set */
4500 case broken: /* cannot be set */
4507 if (!mddev->pers || !md_is_rdwr(mddev))
4509 /* write sysfs will not open mddev and opener should be 0 */
4510 err = mddev_set_closing_and_sync_blockdev(mddev, 0);
4518 if (mddev->pers && (st == active || st == clean) &&
4519 mddev->ro != MD_RDONLY) {
4520 /* don't take reconfig_mutex when toggling between
4523 spin_lock(&mddev->lock);
4525 restart_array(mddev);
4526 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4527 md_wakeup_thread(mddev->thread);
4528 wake_up(&mddev->sb_wait);
4529 } else /* st == clean */ {
4530 restart_array(mddev);
4531 if (!set_in_sync(mddev))
4535 sysfs_notify_dirent_safe(mddev->sysfs_state);
4536 spin_unlock(&mddev->lock);
4539 err = mddev_lock(mddev);
4545 /* stop an active array, return 0 otherwise */
4547 err = do_md_stop(mddev, 2);
4550 err = do_md_stop(mddev, 0);
4554 err = md_set_readonly(mddev);
4556 mddev->ro = MD_RDONLY;
4557 set_disk_ro(mddev->gendisk, 1);
4558 err = do_md_run(mddev);
4563 if (md_is_rdwr(mddev))
4564 err = md_set_readonly(mddev);
4565 else if (mddev->ro == MD_RDONLY)
4566 err = restart_array(mddev);
4568 mddev->ro = MD_AUTO_READ;
4569 set_disk_ro(mddev->gendisk, 0);
4572 mddev->ro = MD_AUTO_READ;
4573 err = do_md_run(mddev);
4578 err = restart_array(mddev);
4581 spin_lock(&mddev->lock);
4582 if (!set_in_sync(mddev))
4584 spin_unlock(&mddev->lock);
4590 err = restart_array(mddev);
4593 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4594 wake_up(&mddev->sb_wait);
4597 mddev->ro = MD_RDWR;
4598 set_disk_ro(mddev->gendisk, 0);
4599 err = do_md_run(mddev);
4608 if (mddev->hold_active == UNTIL_IOCTL)
4609 mddev->hold_active = 0;
4610 sysfs_notify_dirent_safe(mddev->sysfs_state);
4612 mddev_unlock(mddev);
4614 if (st == readonly || st == read_auto || st == inactive ||
4615 (err && st == clear))
4616 clear_bit(MD_CLOSING, &mddev->flags);
4620 static struct md_sysfs_entry md_array_state =
4621 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4624 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4625 return sprintf(page, "%d\n",
4626 atomic_read(&mddev->max_corr_read_errors));
4630 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4635 rv = kstrtouint(buf, 10, &n);
4640 atomic_set(&mddev->max_corr_read_errors, n);
4644 static struct md_sysfs_entry max_corr_read_errors =
4645 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4646 max_corrected_read_errors_store);
4649 null_show(struct mddev *mddev, char *page)
4655 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4657 /* buf must be %d:%d\n? giving major and minor numbers */
4658 /* The new device is added to the array.
4659 * If the array has a persistent superblock, we read the
4660 * superblock to initialise info and check validity.
4661 * Otherwise, only checking done is that in bind_rdev_to_array,
4662 * which mainly checks size.
4665 int major = simple_strtoul(buf, &e, 10);
4668 struct md_rdev *rdev;
4671 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4673 minor = simple_strtoul(e+1, &e, 10);
4674 if (*e && *e != '\n')
4676 dev = MKDEV(major, minor);
4677 if (major != MAJOR(dev) ||
4678 minor != MINOR(dev))
4681 err = mddev_suspend_and_lock(mddev);
4684 if (mddev->persistent) {
4685 rdev = md_import_device(dev, mddev->major_version,
4686 mddev->minor_version);
4687 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4688 struct md_rdev *rdev0
4689 = list_entry(mddev->disks.next,
4690 struct md_rdev, same_set);
4691 err = super_types[mddev->major_version]
4692 .load_super(rdev, rdev0, mddev->minor_version);
4696 } else if (mddev->external)
4697 rdev = md_import_device(dev, -2, -1);
4699 rdev = md_import_device(dev, -1, -1);
4702 mddev_unlock_and_resume(mddev);
4703 return PTR_ERR(rdev);
4705 err = bind_rdev_to_array(rdev, mddev);
4708 export_rdev(rdev, mddev);
4709 mddev_unlock_and_resume(mddev);
4712 return err ? err : len;
4715 static struct md_sysfs_entry md_new_device =
4716 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4719 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4722 unsigned long chunk, end_chunk;
4725 err = mddev_lock(mddev);
4730 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4732 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4733 if (buf == end) break;
4734 if (*end == '-') { /* range */
4736 end_chunk = simple_strtoul(buf, &end, 0);
4737 if (buf == end) break;
4739 if (*end && !isspace(*end)) break;
4740 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4741 buf = skip_spaces(end);
4743 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4745 mddev_unlock(mddev);
4749 static struct md_sysfs_entry md_bitmap =
4750 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4753 size_show(struct mddev *mddev, char *page)
4755 return sprintf(page, "%llu\n",
4756 (unsigned long long)mddev->dev_sectors / 2);
4759 static int update_size(struct mddev *mddev, sector_t num_sectors);
4762 size_store(struct mddev *mddev, const char *buf, size_t len)
4764 /* If array is inactive, we can reduce the component size, but
4765 * not increase it (except from 0).
4766 * If array is active, we can try an on-line resize
4769 int err = strict_blocks_to_sectors(buf, §ors);
4773 err = mddev_lock(mddev);
4777 err = update_size(mddev, sectors);
4779 md_update_sb(mddev, 1);
4781 if (mddev->dev_sectors == 0 ||
4782 mddev->dev_sectors > sectors)
4783 mddev->dev_sectors = sectors;
4787 mddev_unlock(mddev);
4788 return err ? err : len;
4791 static struct md_sysfs_entry md_size =
4792 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4794 /* Metadata version.
4796 * 'none' for arrays with no metadata (good luck...)
4797 * 'external' for arrays with externally managed metadata,
4798 * or N.M for internally known formats
4801 metadata_show(struct mddev *mddev, char *page)
4803 if (mddev->persistent)
4804 return sprintf(page, "%d.%d\n",
4805 mddev->major_version, mddev->minor_version);
4806 else if (mddev->external)
4807 return sprintf(page, "external:%s\n", mddev->metadata_type);
4809 return sprintf(page, "none\n");
4813 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4818 /* Changing the details of 'external' metadata is
4819 * always permitted. Otherwise there must be
4820 * no devices attached to the array.
4823 err = mddev_lock(mddev);
4827 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4829 else if (!list_empty(&mddev->disks))
4833 if (cmd_match(buf, "none")) {
4834 mddev->persistent = 0;
4835 mddev->external = 0;
4836 mddev->major_version = 0;
4837 mddev->minor_version = 90;
4840 if (strncmp(buf, "external:", 9) == 0) {
4841 size_t namelen = len-9;
4842 if (namelen >= sizeof(mddev->metadata_type))
4843 namelen = sizeof(mddev->metadata_type)-1;
4844 memcpy(mddev->metadata_type, buf+9, namelen);
4845 mddev->metadata_type[namelen] = 0;
4846 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4847 mddev->metadata_type[--namelen] = 0;
4848 mddev->persistent = 0;
4849 mddev->external = 1;
4850 mddev->major_version = 0;
4851 mddev->minor_version = 90;
4854 major = simple_strtoul(buf, &e, 10);
4856 if (e==buf || *e != '.')
4859 minor = simple_strtoul(buf, &e, 10);
4860 if (e==buf || (*e && *e != '\n') )
4863 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4865 mddev->major_version = major;
4866 mddev->minor_version = minor;
4867 mddev->persistent = 1;
4868 mddev->external = 0;
4871 mddev_unlock(mddev);
4875 static struct md_sysfs_entry md_metadata =
4876 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4879 action_show(struct mddev *mddev, char *page)
4881 char *type = "idle";
4882 unsigned long recovery = mddev->recovery;
4883 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4885 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4886 (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4887 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4889 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4890 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4892 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4896 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4898 else if (mddev->reshape_position != MaxSector)
4901 return sprintf(page, "%s\n", type);
4905 * stop_sync_thread() - wait for sync_thread to stop if it's running.
4906 * @mddev: the array.
4907 * @locked: if set, reconfig_mutex will still be held after this function
4908 * return; if not set, reconfig_mutex will be released after this
4910 * @check_seq: if set, only wait for curent running sync_thread to stop, noted
4911 * that new sync_thread can still start.
4913 static void stop_sync_thread(struct mddev *mddev, bool locked, bool check_seq)
4918 sync_seq = atomic_read(&mddev->sync_seq);
4920 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4922 mddev_unlock(mddev);
4926 mddev_unlock(mddev);
4928 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4930 * Thread might be blocked waiting for metadata update which will now
4933 md_wakeup_thread_directly(mddev->sync_thread);
4934 if (work_pending(&mddev->sync_work))
4935 flush_work(&mddev->sync_work);
4937 wait_event(resync_wait,
4938 !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4939 (check_seq && sync_seq != atomic_read(&mddev->sync_seq)));
4942 mddev_lock_nointr(mddev);
4945 static void idle_sync_thread(struct mddev *mddev)
4947 mutex_lock(&mddev->sync_mutex);
4948 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4950 if (mddev_lock(mddev)) {
4951 mutex_unlock(&mddev->sync_mutex);
4955 stop_sync_thread(mddev, false, true);
4956 mutex_unlock(&mddev->sync_mutex);
4959 static void frozen_sync_thread(struct mddev *mddev)
4961 mutex_lock(&mddev->sync_mutex);
4962 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4964 if (mddev_lock(mddev)) {
4965 mutex_unlock(&mddev->sync_mutex);
4969 stop_sync_thread(mddev, false, false);
4970 mutex_unlock(&mddev->sync_mutex);
4974 action_store(struct mddev *mddev, const char *page, size_t len)
4976 if (!mddev->pers || !mddev->pers->sync_request)
4980 if (cmd_match(page, "idle"))
4981 idle_sync_thread(mddev);
4982 else if (cmd_match(page, "frozen"))
4983 frozen_sync_thread(mddev);
4984 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4986 else if (cmd_match(page, "resync"))
4987 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4988 else if (cmd_match(page, "recover")) {
4989 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4990 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4991 } else if (cmd_match(page, "reshape")) {
4993 if (mddev->pers->start_reshape == NULL)
4995 err = mddev_lock(mddev);
4997 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4999 } else if (mddev->reshape_position == MaxSector ||
5000 mddev->pers->check_reshape == NULL ||
5001 mddev->pers->check_reshape(mddev)) {
5002 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5003 err = mddev->pers->start_reshape(mddev);
5006 * If reshape is still in progress, and
5007 * md_check_recovery() can continue to reshape,
5008 * don't restart reshape because data can be
5009 * corrupted for raid456.
5011 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5013 mddev_unlock(mddev);
5017 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
5019 if (cmd_match(page, "check"))
5020 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5021 else if (!cmd_match(page, "repair"))
5023 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5024 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
5025 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5027 if (mddev->ro == MD_AUTO_READ) {
5028 /* A write to sync_action is enough to justify
5029 * canceling read-auto mode
5031 flush_work(&mddev->sync_work);
5032 mddev->ro = MD_RDWR;
5033 md_wakeup_thread(mddev->sync_thread);
5035 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5036 md_wakeup_thread(mddev->thread);
5037 sysfs_notify_dirent_safe(mddev->sysfs_action);
5041 static struct md_sysfs_entry md_scan_mode =
5042 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
5045 last_sync_action_show(struct mddev *mddev, char *page)
5047 return sprintf(page, "%s\n", mddev->last_sync_action);
5050 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
5053 mismatch_cnt_show(struct mddev *mddev, char *page)
5055 return sprintf(page, "%llu\n",
5056 (unsigned long long)
5057 atomic64_read(&mddev->resync_mismatches));
5060 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
5063 sync_min_show(struct mddev *mddev, char *page)
5065 return sprintf(page, "%d (%s)\n", speed_min(mddev),
5066 mddev->sync_speed_min ? "local": "system");
5070 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
5075 if (strncmp(buf, "system", 6)==0) {
5078 rv = kstrtouint(buf, 10, &min);
5084 mddev->sync_speed_min = min;
5088 static struct md_sysfs_entry md_sync_min =
5089 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
5092 sync_max_show(struct mddev *mddev, char *page)
5094 return sprintf(page, "%d (%s)\n", speed_max(mddev),
5095 mddev->sync_speed_max ? "local": "system");
5099 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
5104 if (strncmp(buf, "system", 6)==0) {
5107 rv = kstrtouint(buf, 10, &max);
5113 mddev->sync_speed_max = max;
5117 static struct md_sysfs_entry md_sync_max =
5118 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
5121 degraded_show(struct mddev *mddev, char *page)
5123 return sprintf(page, "%d\n", mddev->degraded);
5125 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
5128 sync_force_parallel_show(struct mddev *mddev, char *page)
5130 return sprintf(page, "%d\n", mddev->parallel_resync);
5134 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
5138 if (kstrtol(buf, 10, &n))
5141 if (n != 0 && n != 1)
5144 mddev->parallel_resync = n;
5146 if (mddev->sync_thread)
5147 wake_up(&resync_wait);
5152 /* force parallel resync, even with shared block devices */
5153 static struct md_sysfs_entry md_sync_force_parallel =
5154 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5155 sync_force_parallel_show, sync_force_parallel_store);
5158 sync_speed_show(struct mddev *mddev, char *page)
5160 unsigned long resync, dt, db;
5161 if (mddev->curr_resync == MD_RESYNC_NONE)
5162 return sprintf(page, "none\n");
5163 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5164 dt = (jiffies - mddev->resync_mark) / HZ;
5166 db = resync - mddev->resync_mark_cnt;
5167 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5170 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5173 sync_completed_show(struct mddev *mddev, char *page)
5175 unsigned long long max_sectors, resync;
5177 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5178 return sprintf(page, "none\n");
5180 if (mddev->curr_resync == MD_RESYNC_YIELDED ||
5181 mddev->curr_resync == MD_RESYNC_DELAYED)
5182 return sprintf(page, "delayed\n");
5184 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5185 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5186 max_sectors = mddev->resync_max_sectors;
5188 max_sectors = mddev->dev_sectors;
5190 resync = mddev->curr_resync_completed;
5191 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5194 static struct md_sysfs_entry md_sync_completed =
5195 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5198 min_sync_show(struct mddev *mddev, char *page)
5200 return sprintf(page, "%llu\n",
5201 (unsigned long long)mddev->resync_min);
5204 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5206 unsigned long long min;
5209 if (kstrtoull(buf, 10, &min))
5212 spin_lock(&mddev->lock);
5214 if (min > mddev->resync_max)
5218 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5221 /* Round down to multiple of 4K for safety */
5222 mddev->resync_min = round_down(min, 8);
5226 spin_unlock(&mddev->lock);
5230 static struct md_sysfs_entry md_min_sync =
5231 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5234 max_sync_show(struct mddev *mddev, char *page)
5236 if (mddev->resync_max == MaxSector)
5237 return sprintf(page, "max\n");
5239 return sprintf(page, "%llu\n",
5240 (unsigned long long)mddev->resync_max);
5243 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5246 spin_lock(&mddev->lock);
5247 if (strncmp(buf, "max", 3) == 0)
5248 mddev->resync_max = MaxSector;
5250 unsigned long long max;
5254 if (kstrtoull(buf, 10, &max))
5256 if (max < mddev->resync_min)
5260 if (max < mddev->resync_max && md_is_rdwr(mddev) &&
5261 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5264 /* Must be a multiple of chunk_size */
5265 chunk = mddev->chunk_sectors;
5267 sector_t temp = max;
5270 if (sector_div(temp, chunk))
5273 mddev->resync_max = max;
5275 wake_up(&mddev->recovery_wait);
5278 spin_unlock(&mddev->lock);
5282 static struct md_sysfs_entry md_max_sync =
5283 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5286 suspend_lo_show(struct mddev *mddev, char *page)
5288 return sprintf(page, "%llu\n",
5289 (unsigned long long)READ_ONCE(mddev->suspend_lo));
5293 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5295 unsigned long long new;
5298 err = kstrtoull(buf, 10, &new);
5301 if (new != (sector_t)new)
5304 err = mddev_suspend(mddev, true);
5308 WRITE_ONCE(mddev->suspend_lo, new);
5309 mddev_resume(mddev);
5313 static struct md_sysfs_entry md_suspend_lo =
5314 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5317 suspend_hi_show(struct mddev *mddev, char *page)
5319 return sprintf(page, "%llu\n",
5320 (unsigned long long)READ_ONCE(mddev->suspend_hi));
5324 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5326 unsigned long long new;
5329 err = kstrtoull(buf, 10, &new);
5332 if (new != (sector_t)new)
5335 err = mddev_suspend(mddev, true);
5339 WRITE_ONCE(mddev->suspend_hi, new);
5340 mddev_resume(mddev);
5344 static struct md_sysfs_entry md_suspend_hi =
5345 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5348 reshape_position_show(struct mddev *mddev, char *page)
5350 if (mddev->reshape_position != MaxSector)
5351 return sprintf(page, "%llu\n",
5352 (unsigned long long)mddev->reshape_position);
5353 strcpy(page, "none\n");
5358 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5360 struct md_rdev *rdev;
5361 unsigned long long new;
5364 err = kstrtoull(buf, 10, &new);
5367 if (new != (sector_t)new)
5369 err = mddev_lock(mddev);
5375 mddev->reshape_position = new;
5376 mddev->delta_disks = 0;
5377 mddev->reshape_backwards = 0;
5378 mddev->new_level = mddev->level;
5379 mddev->new_layout = mddev->layout;
5380 mddev->new_chunk_sectors = mddev->chunk_sectors;
5381 rdev_for_each(rdev, mddev)
5382 rdev->new_data_offset = rdev->data_offset;
5385 mddev_unlock(mddev);
5389 static struct md_sysfs_entry md_reshape_position =
5390 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5391 reshape_position_store);
5394 reshape_direction_show(struct mddev *mddev, char *page)
5396 return sprintf(page, "%s\n",
5397 mddev->reshape_backwards ? "backwards" : "forwards");
5401 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5406 if (cmd_match(buf, "forwards"))
5408 else if (cmd_match(buf, "backwards"))
5412 if (mddev->reshape_backwards == backwards)
5415 err = mddev_lock(mddev);
5418 /* check if we are allowed to change */
5419 if (mddev->delta_disks)
5421 else if (mddev->persistent &&
5422 mddev->major_version == 0)
5425 mddev->reshape_backwards = backwards;
5426 mddev_unlock(mddev);
5430 static struct md_sysfs_entry md_reshape_direction =
5431 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5432 reshape_direction_store);
5435 array_size_show(struct mddev *mddev, char *page)
5437 if (mddev->external_size)
5438 return sprintf(page, "%llu\n",
5439 (unsigned long long)mddev->array_sectors/2);
5441 return sprintf(page, "default\n");
5445 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5450 err = mddev_lock(mddev);
5454 /* cluster raid doesn't support change array_sectors */
5455 if (mddev_is_clustered(mddev)) {
5456 mddev_unlock(mddev);
5460 if (strncmp(buf, "default", 7) == 0) {
5462 sectors = mddev->pers->size(mddev, 0, 0);
5464 sectors = mddev->array_sectors;
5466 mddev->external_size = 0;
5468 if (strict_blocks_to_sectors(buf, §ors) < 0)
5470 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5473 mddev->external_size = 1;
5477 mddev->array_sectors = sectors;
5479 set_capacity_and_notify(mddev->gendisk,
5480 mddev->array_sectors);
5482 mddev_unlock(mddev);
5486 static struct md_sysfs_entry md_array_size =
5487 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5491 consistency_policy_show(struct mddev *mddev, char *page)
5495 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5496 ret = sprintf(page, "journal\n");
5497 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5498 ret = sprintf(page, "ppl\n");
5499 } else if (mddev->bitmap) {
5500 ret = sprintf(page, "bitmap\n");
5501 } else if (mddev->pers) {
5502 if (mddev->pers->sync_request)
5503 ret = sprintf(page, "resync\n");
5505 ret = sprintf(page, "none\n");
5507 ret = sprintf(page, "unknown\n");
5514 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5519 if (mddev->pers->change_consistency_policy)
5520 err = mddev->pers->change_consistency_policy(mddev, buf);
5523 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5524 set_bit(MD_HAS_PPL, &mddev->flags);
5529 return err ? err : len;
5532 static struct md_sysfs_entry md_consistency_policy =
5533 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5534 consistency_policy_store);
5536 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5538 return sprintf(page, "%d\n", mddev->fail_last_dev);
5542 * Setting fail_last_dev to true to allow last device to be forcibly removed
5543 * from RAID1/RAID10.
5546 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5551 ret = kstrtobool(buf, &value);
5555 if (value != mddev->fail_last_dev)
5556 mddev->fail_last_dev = value;
5560 static struct md_sysfs_entry md_fail_last_dev =
5561 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5562 fail_last_dev_store);
5564 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5566 if (mddev->pers == NULL || (mddev->pers->level != 1))
5567 return sprintf(page, "n/a\n");
5569 return sprintf(page, "%d\n", mddev->serialize_policy);
5573 * Setting serialize_policy to true to enforce write IO is not reordered
5577 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5582 err = kstrtobool(buf, &value);
5586 if (value == mddev->serialize_policy)
5589 err = mddev_suspend_and_lock(mddev);
5592 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5593 pr_err("md: serialize_policy is only effective for raid1\n");
5599 mddev_create_serial_pool(mddev, NULL);
5601 mddev_destroy_serial_pool(mddev, NULL);
5602 mddev->serialize_policy = value;
5604 mddev_unlock_and_resume(mddev);
5608 static struct md_sysfs_entry md_serialize_policy =
5609 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5610 serialize_policy_store);
5613 static struct attribute *md_default_attrs[] = {
5616 &md_raid_disks.attr,
5618 &md_chunk_size.attr,
5620 &md_resync_start.attr,
5622 &md_new_device.attr,
5623 &md_safe_delay.attr,
5624 &md_array_state.attr,
5625 &md_reshape_position.attr,
5626 &md_reshape_direction.attr,
5627 &md_array_size.attr,
5628 &max_corr_read_errors.attr,
5629 &md_consistency_policy.attr,
5630 &md_fail_last_dev.attr,
5631 &md_serialize_policy.attr,
5635 static const struct attribute_group md_default_group = {
5636 .attrs = md_default_attrs,
5639 static struct attribute *md_redundancy_attrs[] = {
5641 &md_last_scan_mode.attr,
5642 &md_mismatches.attr,
5645 &md_sync_speed.attr,
5646 &md_sync_force_parallel.attr,
5647 &md_sync_completed.attr,
5650 &md_suspend_lo.attr,
5651 &md_suspend_hi.attr,
5656 static const struct attribute_group md_redundancy_group = {
5658 .attrs = md_redundancy_attrs,
5661 static const struct attribute_group *md_attr_groups[] = {
5668 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5670 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5671 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5676 spin_lock(&all_mddevs_lock);
5677 if (!mddev_get(mddev)) {
5678 spin_unlock(&all_mddevs_lock);
5681 spin_unlock(&all_mddevs_lock);
5683 rv = entry->show(mddev, page);
5689 md_attr_store(struct kobject *kobj, struct attribute *attr,
5690 const char *page, size_t length)
5692 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5693 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5698 if (!capable(CAP_SYS_ADMIN))
5700 spin_lock(&all_mddevs_lock);
5701 if (!mddev_get(mddev)) {
5702 spin_unlock(&all_mddevs_lock);
5705 spin_unlock(&all_mddevs_lock);
5706 rv = entry->store(mddev, page, length);
5711 static void md_kobj_release(struct kobject *ko)
5713 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5715 if (mddev->sysfs_state)
5716 sysfs_put(mddev->sysfs_state);
5717 if (mddev->sysfs_level)
5718 sysfs_put(mddev->sysfs_level);
5720 del_gendisk(mddev->gendisk);
5721 put_disk(mddev->gendisk);
5724 static const struct sysfs_ops md_sysfs_ops = {
5725 .show = md_attr_show,
5726 .store = md_attr_store,
5728 static const struct kobj_type md_ktype = {
5729 .release = md_kobj_release,
5730 .sysfs_ops = &md_sysfs_ops,
5731 .default_groups = md_attr_groups,
5736 static void mddev_delayed_delete(struct work_struct *ws)
5738 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5740 kobject_put(&mddev->kobj);
5743 struct mddev *md_alloc(dev_t dev, char *name)
5746 * If dev is zero, name is the name of a device to allocate with
5747 * an arbitrary minor number. It will be "md_???"
5748 * If dev is non-zero it must be a device number with a MAJOR of
5749 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5750 * the device is being created by opening a node in /dev.
5751 * If "name" is not NULL, the device is being created by
5752 * writing to /sys/module/md_mod/parameters/new_array.
5754 static DEFINE_MUTEX(disks_mutex);
5755 struct mddev *mddev;
5756 struct gendisk *disk;
5763 * Wait for any previous instance of this device to be completely
5764 * removed (mddev_delayed_delete).
5766 flush_workqueue(md_misc_wq);
5768 mutex_lock(&disks_mutex);
5769 mddev = mddev_alloc(dev);
5770 if (IS_ERR(mddev)) {
5771 error = PTR_ERR(mddev);
5775 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5776 shift = partitioned ? MdpMinorShift : 0;
5777 unit = MINOR(mddev->unit) >> shift;
5780 /* Need to ensure that 'name' is not a duplicate.
5782 struct mddev *mddev2;
5783 spin_lock(&all_mddevs_lock);
5785 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5786 if (mddev2->gendisk &&
5787 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5788 spin_unlock(&all_mddevs_lock);
5790 goto out_free_mddev;
5792 spin_unlock(&all_mddevs_lock);
5796 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5798 mddev->hold_active = UNTIL_STOP;
5800 disk = blk_alloc_disk(NULL, NUMA_NO_NODE);
5802 error = PTR_ERR(disk);
5803 goto out_free_mddev;
5806 disk->major = MAJOR(mddev->unit);
5807 disk->first_minor = unit << shift;
5808 disk->minors = 1 << shift;
5810 strcpy(disk->disk_name, name);
5811 else if (partitioned)
5812 sprintf(disk->disk_name, "md_d%d", unit);
5814 sprintf(disk->disk_name, "md%d", unit);
5815 disk->fops = &md_fops;
5816 disk->private_data = mddev;
5818 mddev->queue = disk->queue;
5819 blk_set_stacking_limits(&mddev->queue->limits);
5820 blk_queue_write_cache(mddev->queue, true, true);
5821 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5822 mddev->gendisk = disk;
5823 error = add_disk(disk);
5827 kobject_init(&mddev->kobj, &md_ktype);
5828 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5831 * The disk is already live at this point. Clear the hold flag
5832 * and let mddev_put take care of the deletion, as it isn't any
5833 * different from a normal close on last release now.
5835 mddev->hold_active = 0;
5836 mutex_unlock(&disks_mutex);
5838 return ERR_PTR(error);
5841 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5842 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5843 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5844 mutex_unlock(&disks_mutex);
5852 mutex_unlock(&disks_mutex);
5853 return ERR_PTR(error);
5856 static int md_alloc_and_put(dev_t dev, char *name)
5858 struct mddev *mddev = md_alloc(dev, name);
5861 return PTR_ERR(mddev);
5866 static void md_probe(dev_t dev)
5868 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5871 md_alloc_and_put(dev, NULL);
5874 static int add_named_array(const char *val, const struct kernel_param *kp)
5877 * val must be "md_*" or "mdNNN".
5878 * For "md_*" we allocate an array with a large free minor number, and
5879 * set the name to val. val must not already be an active name.
5880 * For "mdNNN" we allocate an array with the minor number NNN
5881 * which must not already be in use.
5883 int len = strlen(val);
5884 char buf[DISK_NAME_LEN];
5885 unsigned long devnum;
5887 while (len && val[len-1] == '\n')
5889 if (len >= DISK_NAME_LEN)
5891 strscpy(buf, val, len+1);
5892 if (strncmp(buf, "md_", 3) == 0)
5893 return md_alloc_and_put(0, buf);
5894 if (strncmp(buf, "md", 2) == 0 &&
5896 kstrtoul(buf+2, 10, &devnum) == 0 &&
5897 devnum <= MINORMASK)
5898 return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
5903 static void md_safemode_timeout(struct timer_list *t)
5905 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5907 mddev->safemode = 1;
5908 if (mddev->external)
5909 sysfs_notify_dirent_safe(mddev->sysfs_state);
5911 md_wakeup_thread(mddev->thread);
5914 static int start_dirty_degraded;
5916 int md_run(struct mddev *mddev)
5919 struct md_rdev *rdev;
5920 struct md_personality *pers;
5923 if (list_empty(&mddev->disks))
5924 /* cannot run an array with no devices.. */
5929 /* Cannot run until previous stop completes properly */
5930 if (mddev->sysfs_active)
5934 * Analyze all RAID superblock(s)
5936 if (!mddev->raid_disks) {
5937 if (!mddev->persistent)
5939 err = analyze_sbs(mddev);
5944 if (mddev->level != LEVEL_NONE)
5945 request_module("md-level-%d", mddev->level);
5946 else if (mddev->clevel[0])
5947 request_module("md-%s", mddev->clevel);
5950 * Drop all container device buffers, from now on
5951 * the only valid external interface is through the md
5954 mddev->has_superblocks = false;
5955 rdev_for_each(rdev, mddev) {
5956 if (test_bit(Faulty, &rdev->flags))
5958 sync_blockdev(rdev->bdev);
5959 invalidate_bdev(rdev->bdev);
5960 if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
5961 mddev->ro = MD_RDONLY;
5963 set_disk_ro(mddev->gendisk, 1);
5967 mddev->has_superblocks = true;
5969 /* perform some consistency tests on the device.
5970 * We don't want the data to overlap the metadata,
5971 * Internal Bitmap issues have been handled elsewhere.
5973 if (rdev->meta_bdev) {
5974 /* Nothing to check */;
5975 } else if (rdev->data_offset < rdev->sb_start) {
5976 if (mddev->dev_sectors &&
5977 rdev->data_offset + mddev->dev_sectors
5979 pr_warn("md: %s: data overlaps metadata\n",
5984 if (rdev->sb_start + rdev->sb_size/512
5985 > rdev->data_offset) {
5986 pr_warn("md: %s: metadata overlaps data\n",
5991 sysfs_notify_dirent_safe(rdev->sysfs_state);
5992 nowait = nowait && bdev_nowait(rdev->bdev);
5995 if (!bioset_initialized(&mddev->bio_set)) {
5996 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
6000 if (!bioset_initialized(&mddev->sync_set)) {
6001 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
6006 if (!bioset_initialized(&mddev->io_clone_set)) {
6007 err = bioset_init(&mddev->io_clone_set, BIO_POOL_SIZE,
6008 offsetof(struct md_io_clone, bio_clone), 0);
6013 spin_lock(&pers_lock);
6014 pers = find_pers(mddev->level, mddev->clevel);
6015 if (!pers || !try_module_get(pers->owner)) {
6016 spin_unlock(&pers_lock);
6017 if (mddev->level != LEVEL_NONE)
6018 pr_warn("md: personality for level %d is not loaded!\n",
6021 pr_warn("md: personality for level %s is not loaded!\n",
6026 spin_unlock(&pers_lock);
6027 if (mddev->level != pers->level) {
6028 mddev->level = pers->level;
6029 mddev->new_level = pers->level;
6031 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
6033 if (mddev->reshape_position != MaxSector &&
6034 pers->start_reshape == NULL) {
6035 /* This personality cannot handle reshaping... */
6036 module_put(pers->owner);
6041 if (pers->sync_request) {
6042 /* Warn if this is a potentially silly
6045 struct md_rdev *rdev2;
6048 rdev_for_each(rdev, mddev)
6049 rdev_for_each(rdev2, mddev) {
6051 rdev->bdev->bd_disk ==
6052 rdev2->bdev->bd_disk) {
6053 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
6062 pr_warn("True protection against single-disk failure might be compromised.\n");
6065 /* dm-raid expect sync_thread to be frozen until resume */
6067 mddev->recovery = 0;
6069 /* may be over-ridden by personality */
6070 mddev->resync_max_sectors = mddev->dev_sectors;
6072 mddev->ok_start_degraded = start_dirty_degraded;
6074 if (start_readonly && md_is_rdwr(mddev))
6075 mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
6077 err = pers->run(mddev);
6079 pr_warn("md: pers->run() failed ...\n");
6080 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
6081 WARN_ONCE(!mddev->external_size,
6082 "%s: default size too small, but 'external_size' not in effect?\n",
6084 pr_warn("md: invalid array_size %llu > default size %llu\n",
6085 (unsigned long long)mddev->array_sectors / 2,
6086 (unsigned long long)pers->size(mddev, 0, 0) / 2);
6089 if (err == 0 && pers->sync_request &&
6090 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
6091 struct bitmap *bitmap;
6093 bitmap = md_bitmap_create(mddev, -1);
6094 if (IS_ERR(bitmap)) {
6095 err = PTR_ERR(bitmap);
6096 pr_warn("%s: failed to create bitmap (%d)\n",
6097 mdname(mddev), err);
6099 mddev->bitmap = bitmap;
6105 if (mddev->bitmap_info.max_write_behind > 0) {
6106 bool create_pool = false;
6108 rdev_for_each(rdev, mddev) {
6109 if (test_bit(WriteMostly, &rdev->flags) &&
6110 rdev_init_serial(rdev))
6113 if (create_pool && mddev->serial_info_pool == NULL) {
6114 mddev->serial_info_pool =
6115 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
6116 sizeof(struct serial_info));
6117 if (!mddev->serial_info_pool) {
6127 rdev_for_each(rdev, mddev) {
6128 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
6133 if (mddev->degraded)
6136 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6138 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6139 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6141 /* Set the NOWAIT flags if all underlying devices support it */
6143 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
6145 if (pers->sync_request) {
6146 if (mddev->kobj.sd &&
6147 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6148 pr_warn("md: cannot register extra attributes for %s\n",
6150 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6151 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6152 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6153 } else if (mddev->ro == MD_AUTO_READ)
6154 mddev->ro = MD_RDWR;
6156 atomic_set(&mddev->max_corr_read_errors,
6157 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6158 mddev->safemode = 0;
6159 if (mddev_is_clustered(mddev))
6160 mddev->safemode_delay = 0;
6162 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6165 spin_lock(&mddev->lock);
6167 spin_unlock(&mddev->lock);
6168 rdev_for_each(rdev, mddev)
6169 if (rdev->raid_disk >= 0)
6170 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6172 if (mddev->degraded && md_is_rdwr(mddev))
6173 /* This ensures that recovering status is reported immediately
6174 * via sysfs - until a lack of spares is confirmed.
6176 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6177 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6179 if (mddev->sb_flags)
6180 md_update_sb(mddev, 0);
6186 mddev_detach(mddev);
6188 pers->free(mddev, mddev->private);
6189 mddev->private = NULL;
6190 module_put(pers->owner);
6191 md_bitmap_destroy(mddev);
6193 bioset_exit(&mddev->io_clone_set);
6195 bioset_exit(&mddev->sync_set);
6197 bioset_exit(&mddev->bio_set);
6200 EXPORT_SYMBOL_GPL(md_run);
6202 int do_md_run(struct mddev *mddev)
6206 set_bit(MD_NOT_READY, &mddev->flags);
6207 err = md_run(mddev);
6210 err = md_bitmap_load(mddev);
6212 md_bitmap_destroy(mddev);
6216 if (mddev_is_clustered(mddev))
6217 md_allow_write(mddev);
6219 /* run start up tasks that require md_thread */
6222 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6224 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6225 clear_bit(MD_NOT_READY, &mddev->flags);
6227 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6228 sysfs_notify_dirent_safe(mddev->sysfs_state);
6229 sysfs_notify_dirent_safe(mddev->sysfs_action);
6230 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6232 clear_bit(MD_NOT_READY, &mddev->flags);
6236 int md_start(struct mddev *mddev)
6240 if (mddev->pers->start) {
6241 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6242 ret = mddev->pers->start(mddev);
6243 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6244 md_wakeup_thread(mddev->sync_thread);
6248 EXPORT_SYMBOL_GPL(md_start);
6250 static int restart_array(struct mddev *mddev)
6252 struct gendisk *disk = mddev->gendisk;
6253 struct md_rdev *rdev;
6254 bool has_journal = false;
6255 bool has_readonly = false;
6257 /* Complain if it has no devices */
6258 if (list_empty(&mddev->disks))
6262 if (md_is_rdwr(mddev))
6266 rdev_for_each_rcu(rdev, mddev) {
6267 if (test_bit(Journal, &rdev->flags) &&
6268 !test_bit(Faulty, &rdev->flags))
6270 if (rdev_read_only(rdev))
6271 has_readonly = true;
6274 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6275 /* Don't restart rw with journal missing/faulty */
6280 mddev->safemode = 0;
6281 mddev->ro = MD_RDWR;
6282 set_disk_ro(disk, 0);
6283 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6284 /* Kick recovery or resync if necessary */
6285 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6286 md_wakeup_thread(mddev->sync_thread);
6287 sysfs_notify_dirent_safe(mddev->sysfs_state);
6291 static void md_clean(struct mddev *mddev)
6293 mddev->array_sectors = 0;
6294 mddev->external_size = 0;
6295 mddev->dev_sectors = 0;
6296 mddev->raid_disks = 0;
6297 mddev->recovery_cp = 0;
6298 mddev->resync_min = 0;
6299 mddev->resync_max = MaxSector;
6300 mddev->reshape_position = MaxSector;
6301 /* we still need mddev->external in export_rdev, do not clear it yet */
6302 mddev->persistent = 0;
6303 mddev->level = LEVEL_NONE;
6304 mddev->clevel[0] = 0;
6306 * Don't clear MD_CLOSING, or mddev can be opened again.
6307 * 'hold_active != 0' means mddev is still in the creation
6308 * process and will be used later.
6310 if (mddev->hold_active)
6313 mddev->flags &= BIT_ULL_MASK(MD_CLOSING);
6314 mddev->sb_flags = 0;
6315 mddev->ro = MD_RDWR;
6316 mddev->metadata_type[0] = 0;
6317 mddev->chunk_sectors = 0;
6318 mddev->ctime = mddev->utime = 0;
6320 mddev->max_disks = 0;
6322 mddev->can_decrease_events = 0;
6323 mddev->delta_disks = 0;
6324 mddev->reshape_backwards = 0;
6325 mddev->new_level = LEVEL_NONE;
6326 mddev->new_layout = 0;
6327 mddev->new_chunk_sectors = 0;
6328 mddev->curr_resync = MD_RESYNC_NONE;
6329 atomic64_set(&mddev->resync_mismatches, 0);
6330 mddev->suspend_lo = mddev->suspend_hi = 0;
6331 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6332 mddev->recovery = 0;
6335 mddev->degraded = 0;
6336 mddev->safemode = 0;
6337 mddev->private = NULL;
6338 mddev->cluster_info = NULL;
6339 mddev->bitmap_info.offset = 0;
6340 mddev->bitmap_info.default_offset = 0;
6341 mddev->bitmap_info.default_space = 0;
6342 mddev->bitmap_info.chunksize = 0;
6343 mddev->bitmap_info.daemon_sleep = 0;
6344 mddev->bitmap_info.max_write_behind = 0;
6345 mddev->bitmap_info.nodes = 0;
6348 static void __md_stop_writes(struct mddev *mddev)
6350 stop_sync_thread(mddev, true, false);
6351 del_timer_sync(&mddev->safemode_timer);
6353 if (mddev->pers && mddev->pers->quiesce) {
6354 mddev->pers->quiesce(mddev, 1);
6355 mddev->pers->quiesce(mddev, 0);
6357 md_bitmap_flush(mddev);
6359 if (md_is_rdwr(mddev) &&
6360 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6362 /* mark array as shutdown cleanly */
6363 if (!mddev_is_clustered(mddev))
6365 md_update_sb(mddev, 1);
6367 /* disable policy to guarantee rdevs free resources for serialization */
6368 mddev->serialize_policy = 0;
6369 mddev_destroy_serial_pool(mddev, NULL);
6372 void md_stop_writes(struct mddev *mddev)
6374 mddev_lock_nointr(mddev);
6375 __md_stop_writes(mddev);
6376 mddev_unlock(mddev);
6378 EXPORT_SYMBOL_GPL(md_stop_writes);
6380 static void mddev_detach(struct mddev *mddev)
6382 md_bitmap_wait_behind_writes(mddev);
6383 if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
6384 mddev->pers->quiesce(mddev, 1);
6385 mddev->pers->quiesce(mddev, 0);
6387 md_unregister_thread(mddev, &mddev->thread);
6389 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6392 static void __md_stop(struct mddev *mddev)
6394 struct md_personality *pers = mddev->pers;
6395 md_bitmap_destroy(mddev);
6396 mddev_detach(mddev);
6397 spin_lock(&mddev->lock);
6399 spin_unlock(&mddev->lock);
6401 pers->free(mddev, mddev->private);
6402 mddev->private = NULL;
6403 if (pers->sync_request && mddev->to_remove == NULL)
6404 mddev->to_remove = &md_redundancy_group;
6405 module_put(pers->owner);
6406 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6408 bioset_exit(&mddev->bio_set);
6409 bioset_exit(&mddev->sync_set);
6410 bioset_exit(&mddev->io_clone_set);
6413 void md_stop(struct mddev *mddev)
6415 lockdep_assert_held(&mddev->reconfig_mutex);
6417 /* stop the array and free an attached data structures.
6418 * This is called from dm-raid
6420 __md_stop_writes(mddev);
6424 EXPORT_SYMBOL_GPL(md_stop);
6426 /* ensure 'mddev->pers' exist before calling md_set_readonly() */
6427 static int md_set_readonly(struct mddev *mddev)
6432 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6435 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6437 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6440 stop_sync_thread(mddev, false, false);
6441 wait_event(mddev->sb_wait,
6442 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6443 mddev_lock_nointr(mddev);
6445 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6446 pr_warn("md: %s still in use.\n",mdname(mddev));
6451 __md_stop_writes(mddev);
6453 if (mddev->ro == MD_RDONLY) {
6458 mddev->ro = MD_RDONLY;
6459 set_disk_ro(mddev->gendisk, 1);
6462 if (!err || did_freeze) {
6463 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6464 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6465 sysfs_notify_dirent_safe(mddev->sysfs_state);
6472 * 0 - completely stop and dis-assemble array
6473 * 2 - stop but do not disassemble array
6475 static int do_md_stop(struct mddev *mddev, int mode)
6477 struct gendisk *disk = mddev->gendisk;
6478 struct md_rdev *rdev;
6481 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6483 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6486 stop_sync_thread(mddev, true, false);
6488 if (mddev->sysfs_active ||
6489 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6490 pr_warn("md: %s still in use.\n",mdname(mddev));
6492 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6493 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6498 if (!md_is_rdwr(mddev))
6499 set_disk_ro(disk, 0);
6501 __md_stop_writes(mddev);
6504 /* tell userspace to handle 'inactive' */
6505 sysfs_notify_dirent_safe(mddev->sysfs_state);
6507 rdev_for_each(rdev, mddev)
6508 if (rdev->raid_disk >= 0)
6509 sysfs_unlink_rdev(mddev, rdev);
6511 set_capacity_and_notify(disk, 0);
6514 if (!md_is_rdwr(mddev))
6515 mddev->ro = MD_RDWR;
6518 * Free resources if final stop
6521 pr_info("md: %s stopped.\n", mdname(mddev));
6523 if (mddev->bitmap_info.file) {
6524 struct file *f = mddev->bitmap_info.file;
6525 spin_lock(&mddev->lock);
6526 mddev->bitmap_info.file = NULL;
6527 spin_unlock(&mddev->lock);
6530 mddev->bitmap_info.offset = 0;
6532 export_array(mddev);
6535 if (mddev->hold_active == UNTIL_STOP)
6536 mddev->hold_active = 0;
6539 sysfs_notify_dirent_safe(mddev->sysfs_state);
6544 static void autorun_array(struct mddev *mddev)
6546 struct md_rdev *rdev;
6549 if (list_empty(&mddev->disks))
6552 pr_info("md: running: ");
6554 rdev_for_each(rdev, mddev) {
6555 pr_cont("<%pg>", rdev->bdev);
6559 err = do_md_run(mddev);
6561 pr_warn("md: do_md_run() returned %d\n", err);
6562 do_md_stop(mddev, 0);
6567 * lets try to run arrays based on all disks that have arrived
6568 * until now. (those are in pending_raid_disks)
6570 * the method: pick the first pending disk, collect all disks with
6571 * the same UUID, remove all from the pending list and put them into
6572 * the 'same_array' list. Then order this list based on superblock
6573 * update time (freshest comes first), kick out 'old' disks and
6574 * compare superblocks. If everything's fine then run it.
6576 * If "unit" is allocated, then bump its reference count
6578 static void autorun_devices(int part)
6580 struct md_rdev *rdev0, *rdev, *tmp;
6581 struct mddev *mddev;
6583 pr_info("md: autorun ...\n");
6584 while (!list_empty(&pending_raid_disks)) {
6587 LIST_HEAD(candidates);
6588 rdev0 = list_entry(pending_raid_disks.next,
6589 struct md_rdev, same_set);
6591 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6592 INIT_LIST_HEAD(&candidates);
6593 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6594 if (super_90_load(rdev, rdev0, 0) >= 0) {
6595 pr_debug("md: adding %pg ...\n",
6597 list_move(&rdev->same_set, &candidates);
6600 * now we have a set of devices, with all of them having
6601 * mostly sane superblocks. It's time to allocate the
6605 dev = MKDEV(mdp_major,
6606 rdev0->preferred_minor << MdpMinorShift);
6607 unit = MINOR(dev) >> MdpMinorShift;
6609 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6612 if (rdev0->preferred_minor != unit) {
6613 pr_warn("md: unit number in %pg is bad: %d\n",
6614 rdev0->bdev, rdev0->preferred_minor);
6618 mddev = md_alloc(dev, NULL);
6622 if (mddev_suspend_and_lock(mddev))
6623 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6624 else if (mddev->raid_disks || mddev->major_version
6625 || !list_empty(&mddev->disks)) {
6626 pr_warn("md: %s already running, cannot run %pg\n",
6627 mdname(mddev), rdev0->bdev);
6628 mddev_unlock_and_resume(mddev);
6630 pr_debug("md: created %s\n", mdname(mddev));
6631 mddev->persistent = 1;
6632 rdev_for_each_list(rdev, tmp, &candidates) {
6633 list_del_init(&rdev->same_set);
6634 if (bind_rdev_to_array(rdev, mddev))
6635 export_rdev(rdev, mddev);
6637 autorun_array(mddev);
6638 mddev_unlock_and_resume(mddev);
6640 /* on success, candidates will be empty, on error
6643 rdev_for_each_list(rdev, tmp, &candidates) {
6644 list_del_init(&rdev->same_set);
6645 export_rdev(rdev, mddev);
6649 pr_info("md: ... autorun DONE.\n");
6651 #endif /* !MODULE */
6653 static int get_version(void __user *arg)
6657 ver.major = MD_MAJOR_VERSION;
6658 ver.minor = MD_MINOR_VERSION;
6659 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6661 if (copy_to_user(arg, &ver, sizeof(ver)))
6667 static int get_array_info(struct mddev *mddev, void __user *arg)
6669 mdu_array_info_t info;
6670 int nr,working,insync,failed,spare;
6671 struct md_rdev *rdev;
6673 nr = working = insync = failed = spare = 0;
6675 rdev_for_each_rcu(rdev, mddev) {
6677 if (test_bit(Faulty, &rdev->flags))
6681 if (test_bit(In_sync, &rdev->flags))
6683 else if (test_bit(Journal, &rdev->flags))
6684 /* TODO: add journal count to md_u.h */
6692 info.major_version = mddev->major_version;
6693 info.minor_version = mddev->minor_version;
6694 info.patch_version = MD_PATCHLEVEL_VERSION;
6695 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6696 info.level = mddev->level;
6697 info.size = mddev->dev_sectors / 2;
6698 if (info.size != mddev->dev_sectors / 2) /* overflow */
6701 info.raid_disks = mddev->raid_disks;
6702 info.md_minor = mddev->md_minor;
6703 info.not_persistent= !mddev->persistent;
6705 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6708 info.state = (1<<MD_SB_CLEAN);
6709 if (mddev->bitmap && mddev->bitmap_info.offset)
6710 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6711 if (mddev_is_clustered(mddev))
6712 info.state |= (1<<MD_SB_CLUSTERED);
6713 info.active_disks = insync;
6714 info.working_disks = working;
6715 info.failed_disks = failed;
6716 info.spare_disks = spare;
6718 info.layout = mddev->layout;
6719 info.chunk_size = mddev->chunk_sectors << 9;
6721 if (copy_to_user(arg, &info, sizeof(info)))
6727 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6729 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6733 file = kzalloc(sizeof(*file), GFP_NOIO);
6738 spin_lock(&mddev->lock);
6739 /* bitmap enabled */
6740 if (mddev->bitmap_info.file) {
6741 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6742 sizeof(file->pathname));
6746 memmove(file->pathname, ptr,
6747 sizeof(file->pathname)-(ptr-file->pathname));
6749 spin_unlock(&mddev->lock);
6752 copy_to_user(arg, file, sizeof(*file)))
6759 static int get_disk_info(struct mddev *mddev, void __user * arg)
6761 mdu_disk_info_t info;
6762 struct md_rdev *rdev;
6764 if (copy_from_user(&info, arg, sizeof(info)))
6768 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6770 info.major = MAJOR(rdev->bdev->bd_dev);
6771 info.minor = MINOR(rdev->bdev->bd_dev);
6772 info.raid_disk = rdev->raid_disk;
6774 if (test_bit(Faulty, &rdev->flags))
6775 info.state |= (1<<MD_DISK_FAULTY);
6776 else if (test_bit(In_sync, &rdev->flags)) {
6777 info.state |= (1<<MD_DISK_ACTIVE);
6778 info.state |= (1<<MD_DISK_SYNC);
6780 if (test_bit(Journal, &rdev->flags))
6781 info.state |= (1<<MD_DISK_JOURNAL);
6782 if (test_bit(WriteMostly, &rdev->flags))
6783 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6784 if (test_bit(FailFast, &rdev->flags))
6785 info.state |= (1<<MD_DISK_FAILFAST);
6787 info.major = info.minor = 0;
6788 info.raid_disk = -1;
6789 info.state = (1<<MD_DISK_REMOVED);
6793 if (copy_to_user(arg, &info, sizeof(info)))
6799 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6801 struct md_rdev *rdev;
6802 dev_t dev = MKDEV(info->major,info->minor);
6804 if (mddev_is_clustered(mddev) &&
6805 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6806 pr_warn("%s: Cannot add to clustered mddev.\n",
6811 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6814 if (!mddev->raid_disks) {
6816 /* expecting a device which has a superblock */
6817 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6819 pr_warn("md: md_import_device returned %ld\n",
6821 return PTR_ERR(rdev);
6823 if (!list_empty(&mddev->disks)) {
6824 struct md_rdev *rdev0
6825 = list_entry(mddev->disks.next,
6826 struct md_rdev, same_set);
6827 err = super_types[mddev->major_version]
6828 .load_super(rdev, rdev0, mddev->minor_version);
6830 pr_warn("md: %pg has different UUID to %pg\n",
6833 export_rdev(rdev, mddev);
6837 err = bind_rdev_to_array(rdev, mddev);
6839 export_rdev(rdev, mddev);
6844 * md_add_new_disk can be used once the array is assembled
6845 * to add "hot spares". They must already have a superblock
6850 if (!mddev->pers->hot_add_disk) {
6851 pr_warn("%s: personality does not support diskops!\n",
6855 if (mddev->persistent)
6856 rdev = md_import_device(dev, mddev->major_version,
6857 mddev->minor_version);
6859 rdev = md_import_device(dev, -1, -1);
6861 pr_warn("md: md_import_device returned %ld\n",
6863 return PTR_ERR(rdev);
6865 /* set saved_raid_disk if appropriate */
6866 if (!mddev->persistent) {
6867 if (info->state & (1<<MD_DISK_SYNC) &&
6868 info->raid_disk < mddev->raid_disks) {
6869 rdev->raid_disk = info->raid_disk;
6870 clear_bit(Bitmap_sync, &rdev->flags);
6872 rdev->raid_disk = -1;
6873 rdev->saved_raid_disk = rdev->raid_disk;
6875 super_types[mddev->major_version].
6876 validate_super(mddev, NULL/*freshest*/, rdev);
6877 if ((info->state & (1<<MD_DISK_SYNC)) &&
6878 rdev->raid_disk != info->raid_disk) {
6879 /* This was a hot-add request, but events doesn't
6880 * match, so reject it.
6882 export_rdev(rdev, mddev);
6886 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6887 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6888 set_bit(WriteMostly, &rdev->flags);
6890 clear_bit(WriteMostly, &rdev->flags);
6891 if (info->state & (1<<MD_DISK_FAILFAST))
6892 set_bit(FailFast, &rdev->flags);
6894 clear_bit(FailFast, &rdev->flags);
6896 if (info->state & (1<<MD_DISK_JOURNAL)) {
6897 struct md_rdev *rdev2;
6898 bool has_journal = false;
6900 /* make sure no existing journal disk */
6901 rdev_for_each(rdev2, mddev) {
6902 if (test_bit(Journal, &rdev2->flags)) {
6907 if (has_journal || mddev->bitmap) {
6908 export_rdev(rdev, mddev);
6911 set_bit(Journal, &rdev->flags);
6914 * check whether the device shows up in other nodes
6916 if (mddev_is_clustered(mddev)) {
6917 if (info->state & (1 << MD_DISK_CANDIDATE))
6918 set_bit(Candidate, &rdev->flags);
6919 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6920 /* --add initiated by this node */
6921 err = md_cluster_ops->add_new_disk(mddev, rdev);
6923 export_rdev(rdev, mddev);
6929 rdev->raid_disk = -1;
6930 err = bind_rdev_to_array(rdev, mddev);
6933 export_rdev(rdev, mddev);
6935 if (mddev_is_clustered(mddev)) {
6936 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6938 err = md_cluster_ops->new_disk_ack(mddev,
6941 md_kick_rdev_from_array(rdev);
6945 md_cluster_ops->add_new_disk_cancel(mddev);
6947 err = add_bound_rdev(rdev);
6951 err = add_bound_rdev(rdev);
6956 /* otherwise, md_add_new_disk is only allowed
6957 * for major_version==0 superblocks
6959 if (mddev->major_version != 0) {
6960 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6964 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6966 rdev = md_import_device(dev, -1, 0);
6968 pr_warn("md: error, md_import_device() returned %ld\n",
6970 return PTR_ERR(rdev);
6972 rdev->desc_nr = info->number;
6973 if (info->raid_disk < mddev->raid_disks)
6974 rdev->raid_disk = info->raid_disk;
6976 rdev->raid_disk = -1;
6978 if (rdev->raid_disk < mddev->raid_disks)
6979 if (info->state & (1<<MD_DISK_SYNC))
6980 set_bit(In_sync, &rdev->flags);
6982 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6983 set_bit(WriteMostly, &rdev->flags);
6984 if (info->state & (1<<MD_DISK_FAILFAST))
6985 set_bit(FailFast, &rdev->flags);
6987 if (!mddev->persistent) {
6988 pr_debug("md: nonpersistent superblock ...\n");
6989 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6991 rdev->sb_start = calc_dev_sboffset(rdev);
6992 rdev->sectors = rdev->sb_start;
6994 err = bind_rdev_to_array(rdev, mddev);
6996 export_rdev(rdev, mddev);
7004 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
7006 struct md_rdev *rdev;
7011 rdev = find_rdev(mddev, dev);
7015 if (rdev->raid_disk < 0)
7018 clear_bit(Blocked, &rdev->flags);
7019 remove_and_add_spares(mddev, rdev);
7021 if (rdev->raid_disk >= 0)
7025 if (mddev_is_clustered(mddev)) {
7026 if (md_cluster_ops->remove_disk(mddev, rdev))
7030 md_kick_rdev_from_array(rdev);
7031 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7033 md_update_sb(mddev, 1);
7038 pr_debug("md: cannot remove active disk %pg from %s ...\n",
7039 rdev->bdev, mdname(mddev));
7043 static int hot_add_disk(struct mddev *mddev, dev_t dev)
7046 struct md_rdev *rdev;
7051 if (mddev->major_version != 0) {
7052 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
7056 if (!mddev->pers->hot_add_disk) {
7057 pr_warn("%s: personality does not support diskops!\n",
7062 rdev = md_import_device(dev, -1, 0);
7064 pr_warn("md: error, md_import_device() returned %ld\n",
7069 if (mddev->persistent)
7070 rdev->sb_start = calc_dev_sboffset(rdev);
7072 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
7074 rdev->sectors = rdev->sb_start;
7076 if (test_bit(Faulty, &rdev->flags)) {
7077 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
7078 rdev->bdev, mdname(mddev));
7083 clear_bit(In_sync, &rdev->flags);
7085 rdev->saved_raid_disk = -1;
7086 err = bind_rdev_to_array(rdev, mddev);
7091 * The rest should better be atomic, we can have disk failures
7092 * noticed in interrupt contexts ...
7095 rdev->raid_disk = -1;
7097 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7099 md_update_sb(mddev, 1);
7101 * If the new disk does not support REQ_NOWAIT,
7102 * disable on the whole MD.
7104 if (!bdev_nowait(rdev->bdev)) {
7105 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
7106 mdname(mddev), rdev->bdev);
7107 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
7110 * Kick recovery, maybe this spare has to be added to the
7111 * array immediately.
7113 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7118 export_rdev(rdev, mddev);
7122 static int set_bitmap_file(struct mddev *mddev, int fd)
7127 if (!mddev->pers->quiesce || !mddev->thread)
7129 if (mddev->recovery || mddev->sync_thread)
7131 /* we should be able to change the bitmap.. */
7135 struct inode *inode;
7138 if (mddev->bitmap || mddev->bitmap_info.file)
7139 return -EEXIST; /* cannot add when bitmap is present */
7141 if (!IS_ENABLED(CONFIG_MD_BITMAP_FILE)) {
7142 pr_warn("%s: bitmap files not supported by this kernel\n",
7146 pr_warn("%s: using deprecated bitmap file support\n",
7152 pr_warn("%s: error: failed to get bitmap file\n",
7157 inode = f->f_mapping->host;
7158 if (!S_ISREG(inode->i_mode)) {
7159 pr_warn("%s: error: bitmap file must be a regular file\n",
7162 } else if (!(f->f_mode & FMODE_WRITE)) {
7163 pr_warn("%s: error: bitmap file must open for write\n",
7166 } else if (atomic_read(&inode->i_writecount) != 1) {
7167 pr_warn("%s: error: bitmap file is already in use\n",
7175 mddev->bitmap_info.file = f;
7176 mddev->bitmap_info.offset = 0; /* file overrides offset */
7177 } else if (mddev->bitmap == NULL)
7178 return -ENOENT; /* cannot remove what isn't there */
7182 struct bitmap *bitmap;
7184 bitmap = md_bitmap_create(mddev, -1);
7185 if (!IS_ERR(bitmap)) {
7186 mddev->bitmap = bitmap;
7187 err = md_bitmap_load(mddev);
7189 err = PTR_ERR(bitmap);
7191 md_bitmap_destroy(mddev);
7194 } else if (fd < 0) {
7195 md_bitmap_destroy(mddev);
7199 struct file *f = mddev->bitmap_info.file;
7201 spin_lock(&mddev->lock);
7202 mddev->bitmap_info.file = NULL;
7203 spin_unlock(&mddev->lock);
7212 * md_set_array_info is used two different ways
7213 * The original usage is when creating a new array.
7214 * In this usage, raid_disks is > 0 and it together with
7215 * level, size, not_persistent,layout,chunksize determine the
7216 * shape of the array.
7217 * This will always create an array with a type-0.90.0 superblock.
7218 * The newer usage is when assembling an array.
7219 * In this case raid_disks will be 0, and the major_version field is
7220 * use to determine which style super-blocks are to be found on the devices.
7221 * The minor and patch _version numbers are also kept incase the
7222 * super_block handler wishes to interpret them.
7224 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7226 if (info->raid_disks == 0) {
7227 /* just setting version number for superblock loading */
7228 if (info->major_version < 0 ||
7229 info->major_version >= ARRAY_SIZE(super_types) ||
7230 super_types[info->major_version].name == NULL) {
7231 /* maybe try to auto-load a module? */
7232 pr_warn("md: superblock version %d not known\n",
7233 info->major_version);
7236 mddev->major_version = info->major_version;
7237 mddev->minor_version = info->minor_version;
7238 mddev->patch_version = info->patch_version;
7239 mddev->persistent = !info->not_persistent;
7240 /* ensure mddev_put doesn't delete this now that there
7241 * is some minimal configuration.
7243 mddev->ctime = ktime_get_real_seconds();
7246 mddev->major_version = MD_MAJOR_VERSION;
7247 mddev->minor_version = MD_MINOR_VERSION;
7248 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7249 mddev->ctime = ktime_get_real_seconds();
7251 mddev->level = info->level;
7252 mddev->clevel[0] = 0;
7253 mddev->dev_sectors = 2 * (sector_t)info->size;
7254 mddev->raid_disks = info->raid_disks;
7255 /* don't set md_minor, it is determined by which /dev/md* was
7258 if (info->state & (1<<MD_SB_CLEAN))
7259 mddev->recovery_cp = MaxSector;
7261 mddev->recovery_cp = 0;
7262 mddev->persistent = ! info->not_persistent;
7263 mddev->external = 0;
7265 mddev->layout = info->layout;
7266 if (mddev->level == 0)
7267 /* Cannot trust RAID0 layout info here */
7269 mddev->chunk_sectors = info->chunk_size >> 9;
7271 if (mddev->persistent) {
7272 mddev->max_disks = MD_SB_DISKS;
7274 mddev->sb_flags = 0;
7276 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7278 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7279 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7280 mddev->bitmap_info.offset = 0;
7282 mddev->reshape_position = MaxSector;
7285 * Generate a 128 bit UUID
7287 get_random_bytes(mddev->uuid, 16);
7289 mddev->new_level = mddev->level;
7290 mddev->new_chunk_sectors = mddev->chunk_sectors;
7291 mddev->new_layout = mddev->layout;
7292 mddev->delta_disks = 0;
7293 mddev->reshape_backwards = 0;
7298 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7300 lockdep_assert_held(&mddev->reconfig_mutex);
7302 if (mddev->external_size)
7305 mddev->array_sectors = array_sectors;
7307 EXPORT_SYMBOL(md_set_array_sectors);
7309 static int update_size(struct mddev *mddev, sector_t num_sectors)
7311 struct md_rdev *rdev;
7313 int fit = (num_sectors == 0);
7314 sector_t old_dev_sectors = mddev->dev_sectors;
7316 if (mddev->pers->resize == NULL)
7318 /* The "num_sectors" is the number of sectors of each device that
7319 * is used. This can only make sense for arrays with redundancy.
7320 * linear and raid0 always use whatever space is available. We can only
7321 * consider changing this number if no resync or reconstruction is
7322 * happening, and if the new size is acceptable. It must fit before the
7323 * sb_start or, if that is <data_offset, it must fit before the size
7324 * of each device. If num_sectors is zero, we find the largest size
7327 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
7329 if (!md_is_rdwr(mddev))
7332 rdev_for_each(rdev, mddev) {
7333 sector_t avail = rdev->sectors;
7335 if (fit && (num_sectors == 0 || num_sectors > avail))
7336 num_sectors = avail;
7337 if (avail < num_sectors)
7340 rv = mddev->pers->resize(mddev, num_sectors);
7342 if (mddev_is_clustered(mddev))
7343 md_cluster_ops->update_size(mddev, old_dev_sectors);
7344 else if (mddev->queue) {
7345 set_capacity_and_notify(mddev->gendisk,
7346 mddev->array_sectors);
7352 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7355 struct md_rdev *rdev;
7356 /* change the number of raid disks */
7357 if (mddev->pers->check_reshape == NULL)
7359 if (!md_is_rdwr(mddev))
7361 if (raid_disks <= 0 ||
7362 (mddev->max_disks && raid_disks >= mddev->max_disks))
7364 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7365 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7366 mddev->reshape_position != MaxSector)
7369 rdev_for_each(rdev, mddev) {
7370 if (mddev->raid_disks < raid_disks &&
7371 rdev->data_offset < rdev->new_data_offset)
7373 if (mddev->raid_disks > raid_disks &&
7374 rdev->data_offset > rdev->new_data_offset)
7378 mddev->delta_disks = raid_disks - mddev->raid_disks;
7379 if (mddev->delta_disks < 0)
7380 mddev->reshape_backwards = 1;
7381 else if (mddev->delta_disks > 0)
7382 mddev->reshape_backwards = 0;
7384 rv = mddev->pers->check_reshape(mddev);
7386 mddev->delta_disks = 0;
7387 mddev->reshape_backwards = 0;
7393 * update_array_info is used to change the configuration of an
7395 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7396 * fields in the info are checked against the array.
7397 * Any differences that cannot be handled will cause an error.
7398 * Normally, only one change can be managed at a time.
7400 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7406 /* calculate expected state,ignoring low bits */
7407 if (mddev->bitmap && mddev->bitmap_info.offset)
7408 state |= (1 << MD_SB_BITMAP_PRESENT);
7410 if (mddev->major_version != info->major_version ||
7411 mddev->minor_version != info->minor_version ||
7412 /* mddev->patch_version != info->patch_version || */
7413 mddev->ctime != info->ctime ||
7414 mddev->level != info->level ||
7415 /* mddev->layout != info->layout || */
7416 mddev->persistent != !info->not_persistent ||
7417 mddev->chunk_sectors != info->chunk_size >> 9 ||
7418 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7419 ((state^info->state) & 0xfffffe00)
7422 /* Check there is only one change */
7423 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7425 if (mddev->raid_disks != info->raid_disks)
7427 if (mddev->layout != info->layout)
7429 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7436 if (mddev->layout != info->layout) {
7438 * we don't need to do anything at the md level, the
7439 * personality will take care of it all.
7441 if (mddev->pers->check_reshape == NULL)
7444 mddev->new_layout = info->layout;
7445 rv = mddev->pers->check_reshape(mddev);
7447 mddev->new_layout = mddev->layout;
7451 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7452 rv = update_size(mddev, (sector_t)info->size * 2);
7454 if (mddev->raid_disks != info->raid_disks)
7455 rv = update_raid_disks(mddev, info->raid_disks);
7457 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7458 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7462 if (mddev->recovery || mddev->sync_thread) {
7466 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7467 struct bitmap *bitmap;
7468 /* add the bitmap */
7469 if (mddev->bitmap) {
7473 if (mddev->bitmap_info.default_offset == 0) {
7477 mddev->bitmap_info.offset =
7478 mddev->bitmap_info.default_offset;
7479 mddev->bitmap_info.space =
7480 mddev->bitmap_info.default_space;
7481 bitmap = md_bitmap_create(mddev, -1);
7482 if (!IS_ERR(bitmap)) {
7483 mddev->bitmap = bitmap;
7484 rv = md_bitmap_load(mddev);
7486 rv = PTR_ERR(bitmap);
7488 md_bitmap_destroy(mddev);
7490 /* remove the bitmap */
7491 if (!mddev->bitmap) {
7495 if (mddev->bitmap->storage.file) {
7499 if (mddev->bitmap_info.nodes) {
7500 /* hold PW on all the bitmap lock */
7501 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7502 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7504 md_cluster_ops->unlock_all_bitmaps(mddev);
7508 mddev->bitmap_info.nodes = 0;
7509 md_cluster_ops->leave(mddev);
7510 module_put(md_cluster_mod);
7511 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7513 md_bitmap_destroy(mddev);
7514 mddev->bitmap_info.offset = 0;
7517 md_update_sb(mddev, 1);
7523 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7525 struct md_rdev *rdev;
7528 if (mddev->pers == NULL)
7532 rdev = md_find_rdev_rcu(mddev, dev);
7536 md_error(mddev, rdev);
7537 if (test_bit(MD_BROKEN, &mddev->flags))
7545 * We have a problem here : there is no easy way to give a CHS
7546 * virtual geometry. We currently pretend that we have a 2 heads
7547 * 4 sectors (with a BIG number of cylinders...). This drives
7548 * dosfs just mad... ;-)
7550 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7552 struct mddev *mddev = bdev->bd_disk->private_data;
7556 geo->cylinders = mddev->array_sectors / 8;
7560 static inline int md_ioctl_valid(unsigned int cmd)
7563 case GET_ARRAY_INFO:
7568 case GET_BITMAP_FILE:
7570 case HOT_REMOVE_DISK:
7571 case RESTART_ARRAY_RW:
7573 case SET_ARRAY_INFO:
7574 case SET_BITMAP_FILE:
7575 case SET_DISK_FAULTY:
7578 case CLUSTERED_DISK_NACK:
7579 if (!capable(CAP_SYS_ADMIN))
7587 static bool md_ioctl_need_suspend(unsigned int cmd)
7592 case HOT_REMOVE_DISK:
7593 case SET_BITMAP_FILE:
7594 case SET_ARRAY_INFO:
7601 static int __md_set_array_info(struct mddev *mddev, void __user *argp)
7603 mdu_array_info_t info;
7607 memset(&info, 0, sizeof(info));
7608 else if (copy_from_user(&info, argp, sizeof(info)))
7612 err = update_array_info(mddev, &info);
7614 pr_warn("md: couldn't update array info. %d\n", err);
7618 if (!list_empty(&mddev->disks)) {
7619 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7623 if (mddev->raid_disks) {
7624 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7628 err = md_set_array_info(mddev, &info);
7630 pr_warn("md: couldn't set array info. %d\n", err);
7635 static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
7636 unsigned int cmd, unsigned long arg)
7639 void __user *argp = (void __user *)arg;
7640 struct mddev *mddev = NULL;
7642 err = md_ioctl_valid(cmd);
7647 * Commands dealing with the RAID driver but not any
7650 if (cmd == RAID_VERSION)
7651 return get_version(argp);
7654 * Commands creating/starting a new array:
7657 mddev = bdev->bd_disk->private_data;
7659 /* Some actions do not requires the mutex */
7661 case GET_ARRAY_INFO:
7662 if (!mddev->raid_disks && !mddev->external)
7664 return get_array_info(mddev, argp);
7667 if (!mddev->raid_disks && !mddev->external)
7669 return get_disk_info(mddev, argp);
7671 case SET_DISK_FAULTY:
7672 return set_disk_faulty(mddev, new_decode_dev(arg));
7674 case GET_BITMAP_FILE:
7675 return get_bitmap_file(mddev, argp);
7678 if (cmd == HOT_REMOVE_DISK)
7679 /* need to ensure recovery thread has run */
7680 wait_event_interruptible_timeout(mddev->sb_wait,
7681 !test_bit(MD_RECOVERY_NEEDED,
7683 msecs_to_jiffies(5000));
7684 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7685 /* Need to flush page cache, and ensure no-one else opens
7688 err = mddev_set_closing_and_sync_blockdev(mddev, 1);
7693 if (!md_is_rdwr(mddev))
7694 flush_work(&mddev->sync_work);
7696 err = md_ioctl_need_suspend(cmd) ? mddev_suspend_and_lock(mddev) :
7699 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7704 if (cmd == SET_ARRAY_INFO) {
7705 err = __md_set_array_info(mddev, argp);
7710 * Commands querying/configuring an existing array:
7712 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7713 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7714 if ((!mddev->raid_disks && !mddev->external)
7715 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7716 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7717 && cmd != GET_BITMAP_FILE) {
7723 * Commands even a read-only array can execute:
7726 case RESTART_ARRAY_RW:
7727 err = restart_array(mddev);
7731 err = do_md_stop(mddev, 0);
7736 err = md_set_readonly(mddev);
7739 case HOT_REMOVE_DISK:
7740 err = hot_remove_disk(mddev, new_decode_dev(arg));
7744 /* We can support ADD_NEW_DISK on read-only arrays
7745 * only if we are re-adding a preexisting device.
7746 * So require mddev->pers and MD_DISK_SYNC.
7749 mdu_disk_info_t info;
7750 if (copy_from_user(&info, argp, sizeof(info)))
7752 else if (!(info.state & (1<<MD_DISK_SYNC)))
7753 /* Need to clear read-only for this */
7756 err = md_add_new_disk(mddev, &info);
7763 * The remaining ioctls are changing the state of the
7764 * superblock, so we do not allow them on read-only arrays.
7766 if (!md_is_rdwr(mddev) && mddev->pers) {
7767 if (mddev->ro != MD_AUTO_READ) {
7771 mddev->ro = MD_RDWR;
7772 sysfs_notify_dirent_safe(mddev->sysfs_state);
7773 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7774 /* mddev_unlock will wake thread */
7775 /* If a device failed while we were read-only, we
7776 * need to make sure the metadata is updated now.
7778 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7779 mddev_unlock(mddev);
7780 wait_event(mddev->sb_wait,
7781 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7782 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7783 mddev_lock_nointr(mddev);
7790 mdu_disk_info_t info;
7791 if (copy_from_user(&info, argp, sizeof(info)))
7794 err = md_add_new_disk(mddev, &info);
7798 case CLUSTERED_DISK_NACK:
7799 if (mddev_is_clustered(mddev))
7800 md_cluster_ops->new_disk_ack(mddev, false);
7806 err = hot_add_disk(mddev, new_decode_dev(arg));
7810 err = do_md_run(mddev);
7813 case SET_BITMAP_FILE:
7814 err = set_bitmap_file(mddev, (int)arg);
7823 if (mddev->hold_active == UNTIL_IOCTL &&
7825 mddev->hold_active = 0;
7827 md_ioctl_need_suspend(cmd) ? mddev_unlock_and_resume(mddev) :
7828 mddev_unlock(mddev);
7831 if (cmd == STOP_ARRAY_RO || (err && cmd == STOP_ARRAY))
7832 clear_bit(MD_CLOSING, &mddev->flags);
7835 #ifdef CONFIG_COMPAT
7836 static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
7837 unsigned int cmd, unsigned long arg)
7840 case HOT_REMOVE_DISK:
7842 case SET_DISK_FAULTY:
7843 case SET_BITMAP_FILE:
7844 /* These take in integer arg, do not convert */
7847 arg = (unsigned long)compat_ptr(arg);
7851 return md_ioctl(bdev, mode, cmd, arg);
7853 #endif /* CONFIG_COMPAT */
7855 static int md_set_read_only(struct block_device *bdev, bool ro)
7857 struct mddev *mddev = bdev->bd_disk->private_data;
7860 err = mddev_lock(mddev);
7864 if (!mddev->raid_disks && !mddev->external) {
7870 * Transitioning to read-auto need only happen for arrays that call
7871 * md_write_start and which are not ready for writes yet.
7873 if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
7874 err = restart_array(mddev);
7877 mddev->ro = MD_AUTO_READ;
7881 mddev_unlock(mddev);
7885 static int md_open(struct gendisk *disk, blk_mode_t mode)
7887 struct mddev *mddev;
7890 spin_lock(&all_mddevs_lock);
7891 mddev = mddev_get(disk->private_data);
7892 spin_unlock(&all_mddevs_lock);
7896 err = mutex_lock_interruptible(&mddev->open_mutex);
7901 if (test_bit(MD_CLOSING, &mddev->flags))
7904 atomic_inc(&mddev->openers);
7905 mutex_unlock(&mddev->open_mutex);
7907 disk_check_media_change(disk);
7911 mutex_unlock(&mddev->open_mutex);
7917 static void md_release(struct gendisk *disk)
7919 struct mddev *mddev = disk->private_data;
7922 atomic_dec(&mddev->openers);
7926 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7928 struct mddev *mddev = disk->private_data;
7929 unsigned int ret = 0;
7932 ret = DISK_EVENT_MEDIA_CHANGE;
7937 static void md_free_disk(struct gendisk *disk)
7939 struct mddev *mddev = disk->private_data;
7944 const struct block_device_operations md_fops =
7946 .owner = THIS_MODULE,
7947 .submit_bio = md_submit_bio,
7949 .release = md_release,
7951 #ifdef CONFIG_COMPAT
7952 .compat_ioctl = md_compat_ioctl,
7954 .getgeo = md_getgeo,
7955 .check_events = md_check_events,
7956 .set_read_only = md_set_read_only,
7957 .free_disk = md_free_disk,
7960 static int md_thread(void *arg)
7962 struct md_thread *thread = arg;
7965 * md_thread is a 'system-thread', it's priority should be very
7966 * high. We avoid resource deadlocks individually in each
7967 * raid personality. (RAID5 does preallocation) We also use RR and
7968 * the very same RT priority as kswapd, thus we will never get
7969 * into a priority inversion deadlock.
7971 * we definitely have to have equal or higher priority than
7972 * bdflush, otherwise bdflush will deadlock if there are too
7973 * many dirty RAID5 blocks.
7976 allow_signal(SIGKILL);
7977 while (!kthread_should_stop()) {
7979 /* We need to wait INTERRUPTIBLE so that
7980 * we don't add to the load-average.
7981 * That means we need to be sure no signals are
7984 if (signal_pending(current))
7985 flush_signals(current);
7987 wait_event_interruptible_timeout
7989 test_bit(THREAD_WAKEUP, &thread->flags)
7990 || kthread_should_stop() || kthread_should_park(),
7993 clear_bit(THREAD_WAKEUP, &thread->flags);
7994 if (kthread_should_park())
7996 if (!kthread_should_stop())
7997 thread->run(thread);
8003 static void md_wakeup_thread_directly(struct md_thread __rcu *thread)
8005 struct md_thread *t;
8008 t = rcu_dereference(thread);
8010 wake_up_process(t->tsk);
8014 void md_wakeup_thread(struct md_thread __rcu *thread)
8016 struct md_thread *t;
8019 t = rcu_dereference(thread);
8021 pr_debug("md: waking up MD thread %s.\n", t->tsk->comm);
8022 set_bit(THREAD_WAKEUP, &t->flags);
8023 wake_up(&t->wqueue);
8027 EXPORT_SYMBOL(md_wakeup_thread);
8029 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
8030 struct mddev *mddev, const char *name)
8032 struct md_thread *thread;
8034 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
8038 init_waitqueue_head(&thread->wqueue);
8041 thread->mddev = mddev;
8042 thread->timeout = MAX_SCHEDULE_TIMEOUT;
8043 thread->tsk = kthread_run(md_thread, thread,
8045 mdname(thread->mddev),
8047 if (IS_ERR(thread->tsk)) {
8053 EXPORT_SYMBOL(md_register_thread);
8055 void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp)
8057 struct md_thread *thread = rcu_dereference_protected(*threadp,
8058 lockdep_is_held(&mddev->reconfig_mutex));
8063 rcu_assign_pointer(*threadp, NULL);
8066 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
8067 kthread_stop(thread->tsk);
8070 EXPORT_SYMBOL(md_unregister_thread);
8072 void md_error(struct mddev *mddev, struct md_rdev *rdev)
8074 if (!rdev || test_bit(Faulty, &rdev->flags))
8077 if (!mddev->pers || !mddev->pers->error_handler)
8079 mddev->pers->error_handler(mddev, rdev);
8081 if (mddev->pers->level == 0)
8084 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
8085 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8086 sysfs_notify_dirent_safe(rdev->sysfs_state);
8087 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8088 if (!test_bit(MD_BROKEN, &mddev->flags)) {
8089 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8090 md_wakeup_thread(mddev->thread);
8092 if (mddev->event_work.func)
8093 queue_work(md_misc_wq, &mddev->event_work);
8096 EXPORT_SYMBOL(md_error);
8098 /* seq_file implementation /proc/mdstat */
8100 static void status_unused(struct seq_file *seq)
8103 struct md_rdev *rdev;
8105 seq_printf(seq, "unused devices: ");
8107 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8109 seq_printf(seq, "%pg ", rdev->bdev);
8112 seq_printf(seq, "<none>");
8114 seq_printf(seq, "\n");
8117 static void status_personalities(struct seq_file *seq)
8119 struct md_personality *pers;
8121 seq_puts(seq, "Personalities : ");
8122 spin_lock(&pers_lock);
8123 list_for_each_entry(pers, &pers_list, list)
8124 seq_printf(seq, "[%s] ", pers->name);
8126 spin_unlock(&pers_lock);
8127 seq_puts(seq, "\n");
8130 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8132 sector_t max_sectors, resync, res;
8133 unsigned long dt, db = 0;
8134 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8135 int scale, recovery_active;
8136 unsigned int per_milli;
8138 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8139 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8140 max_sectors = mddev->resync_max_sectors;
8142 max_sectors = mddev->dev_sectors;
8144 resync = mddev->curr_resync;
8145 if (resync < MD_RESYNC_ACTIVE) {
8146 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8147 /* Still cleaning up */
8148 resync = max_sectors;
8149 } else if (resync > max_sectors) {
8150 resync = max_sectors;
8152 res = atomic_read(&mddev->recovery_active);
8154 * Resync has started, but the subtraction has overflowed or
8155 * yielded one of the special values. Force it to active to
8156 * ensure the status reports an active resync.
8158 if (resync < res || resync - res < MD_RESYNC_ACTIVE)
8159 resync = MD_RESYNC_ACTIVE;
8164 if (resync == MD_RESYNC_NONE) {
8165 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8166 struct md_rdev *rdev;
8168 rdev_for_each(rdev, mddev)
8169 if (rdev->raid_disk >= 0 &&
8170 !test_bit(Faulty, &rdev->flags) &&
8171 rdev->recovery_offset != MaxSector &&
8172 rdev->recovery_offset) {
8173 seq_printf(seq, "\trecover=REMOTE");
8176 if (mddev->reshape_position != MaxSector)
8177 seq_printf(seq, "\treshape=REMOTE");
8179 seq_printf(seq, "\tresync=REMOTE");
8182 if (mddev->recovery_cp < MaxSector) {
8183 seq_printf(seq, "\tresync=PENDING");
8188 if (resync < MD_RESYNC_ACTIVE) {
8189 seq_printf(seq, "\tresync=DELAYED");
8193 WARN_ON(max_sectors == 0);
8194 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8195 * in a sector_t, and (max_sectors>>scale) will fit in a
8196 * u32, as those are the requirements for sector_div.
8197 * Thus 'scale' must be at least 10
8200 if (sizeof(sector_t) > sizeof(unsigned long)) {
8201 while ( max_sectors/2 > (1ULL<<(scale+32)))
8204 res = (resync>>scale)*1000;
8205 sector_div(res, (u32)((max_sectors>>scale)+1));
8209 int i, x = per_milli/50, y = 20-x;
8210 seq_printf(seq, "[");
8211 for (i = 0; i < x; i++)
8212 seq_printf(seq, "=");
8213 seq_printf(seq, ">");
8214 for (i = 0; i < y; i++)
8215 seq_printf(seq, ".");
8216 seq_printf(seq, "] ");
8218 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8219 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8221 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8223 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8224 "resync" : "recovery"))),
8225 per_milli/10, per_milli % 10,
8226 (unsigned long long) resync/2,
8227 (unsigned long long) max_sectors/2);
8230 * dt: time from mark until now
8231 * db: blocks written from mark until now
8232 * rt: remaining time
8234 * rt is a sector_t, which is always 64bit now. We are keeping
8235 * the original algorithm, but it is not really necessary.
8237 * Original algorithm:
8238 * So we divide before multiply in case it is 32bit and close
8240 * We scale the divisor (db) by 32 to avoid losing precision
8241 * near the end of resync when the number of remaining sectors
8243 * We then divide rt by 32 after multiplying by db to compensate.
8244 * The '+1' avoids division by zero if db is very small.
8246 dt = ((jiffies - mddev->resync_mark) / HZ);
8249 curr_mark_cnt = mddev->curr_mark_cnt;
8250 recovery_active = atomic_read(&mddev->recovery_active);
8251 resync_mark_cnt = mddev->resync_mark_cnt;
8253 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8254 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8256 rt = max_sectors - resync; /* number of remaining sectors */
8257 rt = div64_u64(rt, db/32+1);
8261 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8262 ((unsigned long)rt % 60)/6);
8264 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8268 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8269 __acquires(&all_mddevs_lock)
8271 seq->poll_event = atomic_read(&md_event_count);
8272 spin_lock(&all_mddevs_lock);
8274 return seq_list_start_head(&all_mddevs, *pos);
8277 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8279 return seq_list_next(v, &all_mddevs, pos);
8282 static void md_seq_stop(struct seq_file *seq, void *v)
8283 __releases(&all_mddevs_lock)
8285 spin_unlock(&all_mddevs_lock);
8288 static int md_seq_show(struct seq_file *seq, void *v)
8290 struct mddev *mddev;
8292 struct md_rdev *rdev;
8294 if (v == &all_mddevs) {
8295 status_personalities(seq);
8296 if (list_empty(&all_mddevs))
8301 mddev = list_entry(v, struct mddev, all_mddevs);
8302 if (!mddev_get(mddev))
8305 spin_unlock(&all_mddevs_lock);
8306 spin_lock(&mddev->lock);
8307 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8308 seq_printf(seq, "%s : %sactive", mdname(mddev),
8309 mddev->pers ? "" : "in");
8311 if (mddev->ro == MD_RDONLY)
8312 seq_printf(seq, " (read-only)");
8313 if (mddev->ro == MD_AUTO_READ)
8314 seq_printf(seq, " (auto-read-only)");
8315 seq_printf(seq, " %s", mddev->pers->name);
8320 rdev_for_each_rcu(rdev, mddev) {
8321 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8323 if (test_bit(WriteMostly, &rdev->flags))
8324 seq_printf(seq, "(W)");
8325 if (test_bit(Journal, &rdev->flags))
8326 seq_printf(seq, "(J)");
8327 if (test_bit(Faulty, &rdev->flags)) {
8328 seq_printf(seq, "(F)");
8331 if (rdev->raid_disk < 0)
8332 seq_printf(seq, "(S)"); /* spare */
8333 if (test_bit(Replacement, &rdev->flags))
8334 seq_printf(seq, "(R)");
8335 sectors += rdev->sectors;
8339 if (!list_empty(&mddev->disks)) {
8341 seq_printf(seq, "\n %llu blocks",
8342 (unsigned long long)
8343 mddev->array_sectors / 2);
8345 seq_printf(seq, "\n %llu blocks",
8346 (unsigned long long)sectors / 2);
8348 if (mddev->persistent) {
8349 if (mddev->major_version != 0 ||
8350 mddev->minor_version != 90) {
8351 seq_printf(seq," super %d.%d",
8352 mddev->major_version,
8353 mddev->minor_version);
8355 } else if (mddev->external)
8356 seq_printf(seq, " super external:%s",
8357 mddev->metadata_type);
8359 seq_printf(seq, " super non-persistent");
8362 mddev->pers->status(seq, mddev);
8363 seq_printf(seq, "\n ");
8364 if (mddev->pers->sync_request) {
8365 if (status_resync(seq, mddev))
8366 seq_printf(seq, "\n ");
8369 seq_printf(seq, "\n ");
8371 md_bitmap_status(seq, mddev->bitmap);
8373 seq_printf(seq, "\n");
8375 spin_unlock(&mddev->lock);
8376 spin_lock(&all_mddevs_lock);
8378 if (mddev == list_last_entry(&all_mddevs, struct mddev, all_mddevs))
8381 if (atomic_dec_and_test(&mddev->active))
8387 static const struct seq_operations md_seq_ops = {
8388 .start = md_seq_start,
8389 .next = md_seq_next,
8390 .stop = md_seq_stop,
8391 .show = md_seq_show,
8394 static int md_seq_open(struct inode *inode, struct file *file)
8396 struct seq_file *seq;
8399 error = seq_open(file, &md_seq_ops);
8403 seq = file->private_data;
8404 seq->poll_event = atomic_read(&md_event_count);
8408 static int md_unloading;
8409 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8411 struct seq_file *seq = filp->private_data;
8415 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8416 poll_wait(filp, &md_event_waiters, wait);
8418 /* always allow read */
8419 mask = EPOLLIN | EPOLLRDNORM;
8421 if (seq->poll_event != atomic_read(&md_event_count))
8422 mask |= EPOLLERR | EPOLLPRI;
8426 static const struct proc_ops mdstat_proc_ops = {
8427 .proc_open = md_seq_open,
8428 .proc_read = seq_read,
8429 .proc_lseek = seq_lseek,
8430 .proc_release = seq_release,
8431 .proc_poll = mdstat_poll,
8434 int register_md_personality(struct md_personality *p)
8436 pr_debug("md: %s personality registered for level %d\n",
8438 spin_lock(&pers_lock);
8439 list_add_tail(&p->list, &pers_list);
8440 spin_unlock(&pers_lock);
8443 EXPORT_SYMBOL(register_md_personality);
8445 int unregister_md_personality(struct md_personality *p)
8447 pr_debug("md: %s personality unregistered\n", p->name);
8448 spin_lock(&pers_lock);
8449 list_del_init(&p->list);
8450 spin_unlock(&pers_lock);
8453 EXPORT_SYMBOL(unregister_md_personality);
8455 int register_md_cluster_operations(struct md_cluster_operations *ops,
8456 struct module *module)
8459 spin_lock(&pers_lock);
8460 if (md_cluster_ops != NULL)
8463 md_cluster_ops = ops;
8464 md_cluster_mod = module;
8466 spin_unlock(&pers_lock);
8469 EXPORT_SYMBOL(register_md_cluster_operations);
8471 int unregister_md_cluster_operations(void)
8473 spin_lock(&pers_lock);
8474 md_cluster_ops = NULL;
8475 spin_unlock(&pers_lock);
8478 EXPORT_SYMBOL(unregister_md_cluster_operations);
8480 int md_setup_cluster(struct mddev *mddev, int nodes)
8483 if (!md_cluster_ops)
8484 request_module("md-cluster");
8485 spin_lock(&pers_lock);
8486 /* ensure module won't be unloaded */
8487 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8488 pr_warn("can't find md-cluster module or get its reference.\n");
8489 spin_unlock(&pers_lock);
8492 spin_unlock(&pers_lock);
8494 ret = md_cluster_ops->join(mddev, nodes);
8496 mddev->safemode_delay = 0;
8500 void md_cluster_stop(struct mddev *mddev)
8502 if (!md_cluster_ops)
8504 md_cluster_ops->leave(mddev);
8505 module_put(md_cluster_mod);
8508 static int is_mddev_idle(struct mddev *mddev, int init)
8510 struct md_rdev *rdev;
8516 rdev_for_each_rcu(rdev, mddev) {
8517 struct gendisk *disk = rdev->bdev->bd_disk;
8518 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8519 atomic_read(&disk->sync_io);
8520 /* sync IO will cause sync_io to increase before the disk_stats
8521 * as sync_io is counted when a request starts, and
8522 * disk_stats is counted when it completes.
8523 * So resync activity will cause curr_events to be smaller than
8524 * when there was no such activity.
8525 * non-sync IO will cause disk_stat to increase without
8526 * increasing sync_io so curr_events will (eventually)
8527 * be larger than it was before. Once it becomes
8528 * substantially larger, the test below will cause
8529 * the array to appear non-idle, and resync will slow
8531 * If there is a lot of outstanding resync activity when
8532 * we set last_event to curr_events, then all that activity
8533 * completing might cause the array to appear non-idle
8534 * and resync will be slowed down even though there might
8535 * not have been non-resync activity. This will only
8536 * happen once though. 'last_events' will soon reflect
8537 * the state where there is little or no outstanding
8538 * resync requests, and further resync activity will
8539 * always make curr_events less than last_events.
8542 if (init || curr_events - rdev->last_events > 64) {
8543 rdev->last_events = curr_events;
8551 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8553 /* another "blocks" (512byte) blocks have been synced */
8554 atomic_sub(blocks, &mddev->recovery_active);
8555 wake_up(&mddev->recovery_wait);
8557 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8558 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8559 md_wakeup_thread(mddev->thread);
8560 // stop recovery, signal do_sync ....
8563 EXPORT_SYMBOL(md_done_sync);
8565 /* md_write_start(mddev, bi)
8566 * If we need to update some array metadata (e.g. 'active' flag
8567 * in superblock) before writing, schedule a superblock update
8568 * and wait for it to complete.
8569 * A return value of 'false' means that the write wasn't recorded
8570 * and cannot proceed as the array is being suspend.
8572 bool md_write_start(struct mddev *mddev, struct bio *bi)
8576 if (bio_data_dir(bi) != WRITE)
8579 BUG_ON(mddev->ro == MD_RDONLY);
8580 if (mddev->ro == MD_AUTO_READ) {
8581 /* need to switch to read/write */
8582 flush_work(&mddev->sync_work);
8583 mddev->ro = MD_RDWR;
8584 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8585 md_wakeup_thread(mddev->thread);
8586 md_wakeup_thread(mddev->sync_thread);
8590 percpu_ref_get(&mddev->writes_pending);
8591 smp_mb(); /* Match smp_mb in set_in_sync() */
8592 if (mddev->safemode == 1)
8593 mddev->safemode = 0;
8594 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8595 if (mddev->in_sync || mddev->sync_checkers) {
8596 spin_lock(&mddev->lock);
8597 if (mddev->in_sync) {
8599 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8600 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8601 md_wakeup_thread(mddev->thread);
8604 spin_unlock(&mddev->lock);
8608 sysfs_notify_dirent_safe(mddev->sysfs_state);
8609 if (!mddev->has_superblocks)
8611 wait_event(mddev->sb_wait,
8612 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8613 is_md_suspended(mddev));
8614 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8615 percpu_ref_put(&mddev->writes_pending);
8620 EXPORT_SYMBOL(md_write_start);
8622 /* md_write_inc can only be called when md_write_start() has
8623 * already been called at least once of the current request.
8624 * It increments the counter and is useful when a single request
8625 * is split into several parts. Each part causes an increment and
8626 * so needs a matching md_write_end().
8627 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8628 * a spinlocked region.
8630 void md_write_inc(struct mddev *mddev, struct bio *bi)
8632 if (bio_data_dir(bi) != WRITE)
8634 WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
8635 percpu_ref_get(&mddev->writes_pending);
8637 EXPORT_SYMBOL(md_write_inc);
8639 void md_write_end(struct mddev *mddev)
8641 percpu_ref_put(&mddev->writes_pending);
8643 if (mddev->safemode == 2)
8644 md_wakeup_thread(mddev->thread);
8645 else if (mddev->safemode_delay)
8646 /* The roundup() ensures this only performs locking once
8647 * every ->safemode_delay jiffies
8649 mod_timer(&mddev->safemode_timer,
8650 roundup(jiffies, mddev->safemode_delay) +
8651 mddev->safemode_delay);
8654 EXPORT_SYMBOL(md_write_end);
8656 /* This is used by raid0 and raid10 */
8657 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8658 struct bio *bio, sector_t start, sector_t size)
8660 struct bio *discard_bio = NULL;
8662 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8663 &discard_bio) || !discard_bio)
8666 bio_chain(discard_bio, bio);
8667 bio_clone_blkg_association(discard_bio, bio);
8669 trace_block_bio_remap(discard_bio,
8670 disk_devt(mddev->gendisk),
8671 bio->bi_iter.bi_sector);
8672 submit_bio_noacct(discard_bio);
8674 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8676 static void md_end_clone_io(struct bio *bio)
8678 struct md_io_clone *md_io_clone = bio->bi_private;
8679 struct bio *orig_bio = md_io_clone->orig_bio;
8680 struct mddev *mddev = md_io_clone->mddev;
8682 if (bio->bi_status && !orig_bio->bi_status)
8683 orig_bio->bi_status = bio->bi_status;
8685 if (md_io_clone->start_time)
8686 bio_end_io_acct(orig_bio, md_io_clone->start_time);
8689 bio_endio(orig_bio);
8690 percpu_ref_put(&mddev->active_io);
8693 static void md_clone_bio(struct mddev *mddev, struct bio **bio)
8695 struct block_device *bdev = (*bio)->bi_bdev;
8696 struct md_io_clone *md_io_clone;
8698 bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_clone_set);
8700 md_io_clone = container_of(clone, struct md_io_clone, bio_clone);
8701 md_io_clone->orig_bio = *bio;
8702 md_io_clone->mddev = mddev;
8703 if (blk_queue_io_stat(bdev->bd_disk->queue))
8704 md_io_clone->start_time = bio_start_io_acct(*bio);
8706 clone->bi_end_io = md_end_clone_io;
8707 clone->bi_private = md_io_clone;
8711 void md_account_bio(struct mddev *mddev, struct bio **bio)
8713 percpu_ref_get(&mddev->active_io);
8714 md_clone_bio(mddev, bio);
8716 EXPORT_SYMBOL_GPL(md_account_bio);
8718 /* md_allow_write(mddev)
8719 * Calling this ensures that the array is marked 'active' so that writes
8720 * may proceed without blocking. It is important to call this before
8721 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8722 * Must be called with mddev_lock held.
8724 void md_allow_write(struct mddev *mddev)
8728 if (!md_is_rdwr(mddev))
8730 if (!mddev->pers->sync_request)
8733 spin_lock(&mddev->lock);
8734 if (mddev->in_sync) {
8736 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8737 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8738 if (mddev->safemode_delay &&
8739 mddev->safemode == 0)
8740 mddev->safemode = 1;
8741 spin_unlock(&mddev->lock);
8742 md_update_sb(mddev, 0);
8743 sysfs_notify_dirent_safe(mddev->sysfs_state);
8744 /* wait for the dirty state to be recorded in the metadata */
8745 wait_event(mddev->sb_wait,
8746 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8748 spin_unlock(&mddev->lock);
8750 EXPORT_SYMBOL_GPL(md_allow_write);
8752 #define SYNC_MARKS 10
8753 #define SYNC_MARK_STEP (3*HZ)
8754 #define UPDATE_FREQUENCY (5*60*HZ)
8755 void md_do_sync(struct md_thread *thread)
8757 struct mddev *mddev = thread->mddev;
8758 struct mddev *mddev2;
8759 unsigned int currspeed = 0, window;
8760 sector_t max_sectors,j, io_sectors, recovery_done;
8761 unsigned long mark[SYNC_MARKS];
8762 unsigned long update_time;
8763 sector_t mark_cnt[SYNC_MARKS];
8765 sector_t last_check;
8767 struct md_rdev *rdev;
8768 char *desc, *action = NULL;
8769 struct blk_plug plug;
8772 /* just incase thread restarts... */
8773 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8774 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8776 if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
8777 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8781 if (mddev_is_clustered(mddev)) {
8782 ret = md_cluster_ops->resync_start(mddev);
8786 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8787 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8788 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8789 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8790 && ((unsigned long long)mddev->curr_resync_completed
8791 < (unsigned long long)mddev->resync_max_sectors))
8795 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8796 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8797 desc = "data-check";
8799 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8800 desc = "requested-resync";
8804 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8809 mddev->last_sync_action = action ?: desc;
8812 * Before starting a resync we must have set curr_resync to
8813 * 2, and then checked that every "conflicting" array has curr_resync
8814 * less than ours. When we find one that is the same or higher
8815 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8816 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8817 * This will mean we have to start checking from the beginning again.
8822 int mddev2_minor = -1;
8823 mddev->curr_resync = MD_RESYNC_DELAYED;
8826 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8828 spin_lock(&all_mddevs_lock);
8829 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) {
8830 if (test_bit(MD_DELETED, &mddev2->flags))
8832 if (mddev2 == mddev)
8834 if (!mddev->parallel_resync
8835 && mddev2->curr_resync
8836 && match_mddev_units(mddev, mddev2)) {
8838 if (mddev < mddev2 &&
8839 mddev->curr_resync == MD_RESYNC_DELAYED) {
8840 /* arbitrarily yield */
8841 mddev->curr_resync = MD_RESYNC_YIELDED;
8842 wake_up(&resync_wait);
8844 if (mddev > mddev2 &&
8845 mddev->curr_resync == MD_RESYNC_YIELDED)
8846 /* no need to wait here, we can wait the next
8847 * time 'round when curr_resync == 2
8850 /* We need to wait 'interruptible' so as not to
8851 * contribute to the load average, and not to
8852 * be caught by 'softlockup'
8854 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8855 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8856 mddev2->curr_resync >= mddev->curr_resync) {
8857 if (mddev2_minor != mddev2->md_minor) {
8858 mddev2_minor = mddev2->md_minor;
8859 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8860 desc, mdname(mddev),
8863 spin_unlock(&all_mddevs_lock);
8865 if (signal_pending(current))
8866 flush_signals(current);
8868 finish_wait(&resync_wait, &wq);
8871 finish_wait(&resync_wait, &wq);
8874 spin_unlock(&all_mddevs_lock);
8875 } while (mddev->curr_resync < MD_RESYNC_DELAYED);
8878 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8879 /* resync follows the size requested by the personality,
8880 * which defaults to physical size, but can be virtual size
8882 max_sectors = mddev->resync_max_sectors;
8883 atomic64_set(&mddev->resync_mismatches, 0);
8884 /* we don't use the checkpoint if there's a bitmap */
8885 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8886 j = mddev->resync_min;
8887 else if (!mddev->bitmap)
8888 j = mddev->recovery_cp;
8890 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8891 max_sectors = mddev->resync_max_sectors;
8893 * If the original node aborts reshaping then we continue the
8894 * reshaping, so set j again to avoid restart reshape from the
8897 if (mddev_is_clustered(mddev) &&
8898 mddev->reshape_position != MaxSector)
8899 j = mddev->reshape_position;
8901 /* recovery follows the physical size of devices */
8902 max_sectors = mddev->dev_sectors;
8905 rdev_for_each_rcu(rdev, mddev)
8906 if (rdev->raid_disk >= 0 &&
8907 !test_bit(Journal, &rdev->flags) &&
8908 !test_bit(Faulty, &rdev->flags) &&
8909 !test_bit(In_sync, &rdev->flags) &&
8910 rdev->recovery_offset < j)
8911 j = rdev->recovery_offset;
8914 /* If there is a bitmap, we need to make sure all
8915 * writes that started before we added a spare
8916 * complete before we start doing a recovery.
8917 * Otherwise the write might complete and (via
8918 * bitmap_endwrite) set a bit in the bitmap after the
8919 * recovery has checked that bit and skipped that
8922 if (mddev->bitmap) {
8923 mddev->pers->quiesce(mddev, 1);
8924 mddev->pers->quiesce(mddev, 0);
8928 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8929 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8930 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8931 speed_max(mddev), desc);
8933 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8936 for (m = 0; m < SYNC_MARKS; m++) {
8938 mark_cnt[m] = io_sectors;
8941 mddev->resync_mark = mark[last_mark];
8942 mddev->resync_mark_cnt = mark_cnt[last_mark];
8945 * Tune reconstruction:
8947 window = 32 * (PAGE_SIZE / 512);
8948 pr_debug("md: using %dk window, over a total of %lluk.\n",
8949 window/2, (unsigned long long)max_sectors/2);
8951 atomic_set(&mddev->recovery_active, 0);
8954 if (j >= MD_RESYNC_ACTIVE) {
8955 pr_debug("md: resuming %s of %s from checkpoint.\n",
8956 desc, mdname(mddev));
8957 mddev->curr_resync = j;
8959 mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */
8960 mddev->curr_resync_completed = j;
8961 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8963 update_time = jiffies;
8965 blk_start_plug(&plug);
8966 while (j < max_sectors) {
8971 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8972 ((mddev->curr_resync > mddev->curr_resync_completed &&
8973 (mddev->curr_resync - mddev->curr_resync_completed)
8974 > (max_sectors >> 4)) ||
8975 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8976 (j - mddev->curr_resync_completed)*2
8977 >= mddev->resync_max - mddev->curr_resync_completed ||
8978 mddev->curr_resync_completed > mddev->resync_max
8980 /* time to update curr_resync_completed */
8981 wait_event(mddev->recovery_wait,
8982 atomic_read(&mddev->recovery_active) == 0);
8983 mddev->curr_resync_completed = j;
8984 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8985 j > mddev->recovery_cp)
8986 mddev->recovery_cp = j;
8987 update_time = jiffies;
8988 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8989 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8992 while (j >= mddev->resync_max &&
8993 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8994 /* As this condition is controlled by user-space,
8995 * we can block indefinitely, so use '_interruptible'
8996 * to avoid triggering warnings.
8998 flush_signals(current); /* just in case */
8999 wait_event_interruptible(mddev->recovery_wait,
9000 mddev->resync_max > j
9001 || test_bit(MD_RECOVERY_INTR,
9005 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9008 sectors = mddev->pers->sync_request(mddev, j, &skipped);
9010 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9014 if (!skipped) { /* actual IO requested */
9015 io_sectors += sectors;
9016 atomic_add(sectors, &mddev->recovery_active);
9019 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9023 if (j > max_sectors)
9024 /* when skipping, extra large numbers can be returned. */
9026 if (j >= MD_RESYNC_ACTIVE)
9027 mddev->curr_resync = j;
9028 mddev->curr_mark_cnt = io_sectors;
9029 if (last_check == 0)
9030 /* this is the earliest that rebuild will be
9031 * visible in /proc/mdstat
9035 if (last_check + window > io_sectors || j == max_sectors)
9038 last_check = io_sectors;
9040 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
9042 int next = (last_mark+1) % SYNC_MARKS;
9044 mddev->resync_mark = mark[next];
9045 mddev->resync_mark_cnt = mark_cnt[next];
9046 mark[next] = jiffies;
9047 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
9051 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9055 * this loop exits only if either when we are slower than
9056 * the 'hard' speed limit, or the system was IO-idle for
9058 * the system might be non-idle CPU-wise, but we only care
9059 * about not overloading the IO subsystem. (things like an
9060 * e2fsck being done on the RAID array should execute fast)
9064 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9065 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9066 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9068 if (currspeed > speed_min(mddev)) {
9069 if (currspeed > speed_max(mddev)) {
9073 if (!is_mddev_idle(mddev, 0)) {
9075 * Give other IO more of a chance.
9076 * The faster the devices, the less we wait.
9078 wait_event(mddev->recovery_wait,
9079 !atomic_read(&mddev->recovery_active));
9083 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9084 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9085 ? "interrupted" : "done");
9087 * this also signals 'finished resyncing' to md_stop
9089 blk_finish_plug(&plug);
9090 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9092 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9093 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9094 mddev->curr_resync >= MD_RESYNC_ACTIVE) {
9095 mddev->curr_resync_completed = mddev->curr_resync;
9096 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9098 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9100 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9101 mddev->curr_resync > MD_RESYNC_ACTIVE) {
9102 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9103 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9104 if (mddev->curr_resync >= mddev->recovery_cp) {
9105 pr_debug("md: checkpointing %s of %s.\n",
9106 desc, mdname(mddev));
9107 if (test_bit(MD_RECOVERY_ERROR,
9109 mddev->recovery_cp =
9110 mddev->curr_resync_completed;
9112 mddev->recovery_cp =
9116 mddev->recovery_cp = MaxSector;
9118 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9119 mddev->curr_resync = MaxSector;
9120 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9121 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9123 rdev_for_each_rcu(rdev, mddev)
9124 if (rdev->raid_disk >= 0 &&
9125 mddev->delta_disks >= 0 &&
9126 !test_bit(Journal, &rdev->flags) &&
9127 !test_bit(Faulty, &rdev->flags) &&
9128 !test_bit(In_sync, &rdev->flags) &&
9129 rdev->recovery_offset < mddev->curr_resync)
9130 rdev->recovery_offset = mddev->curr_resync;
9136 /* set CHANGE_PENDING here since maybe another update is needed,
9137 * so other nodes are informed. It should be harmless for normal
9139 set_mask_bits(&mddev->sb_flags, 0,
9140 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9142 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9143 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9144 mddev->delta_disks > 0 &&
9145 mddev->pers->finish_reshape &&
9146 mddev->pers->size &&
9148 mddev_lock_nointr(mddev);
9149 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9150 mddev_unlock(mddev);
9151 if (!mddev_is_clustered(mddev))
9152 set_capacity_and_notify(mddev->gendisk,
9153 mddev->array_sectors);
9156 spin_lock(&mddev->lock);
9157 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9158 /* We completed so min/max setting can be forgotten if used. */
9159 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9160 mddev->resync_min = 0;
9161 mddev->resync_max = MaxSector;
9162 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9163 mddev->resync_min = mddev->curr_resync_completed;
9164 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9165 mddev->curr_resync = MD_RESYNC_NONE;
9166 spin_unlock(&mddev->lock);
9168 wake_up(&resync_wait);
9169 md_wakeup_thread(mddev->thread);
9172 EXPORT_SYMBOL_GPL(md_do_sync);
9174 static bool rdev_removeable(struct md_rdev *rdev)
9176 /* rdev is not used. */
9177 if (rdev->raid_disk < 0)
9180 /* There are still inflight io, don't remove this rdev. */
9181 if (atomic_read(&rdev->nr_pending))
9185 * An error occurred but has not yet been acknowledged by the metadata
9186 * handler, don't remove this rdev.
9188 if (test_bit(Blocked, &rdev->flags))
9191 /* Fautly rdev is not used, it's safe to remove it. */
9192 if (test_bit(Faulty, &rdev->flags))
9195 /* Journal disk can only be removed if it's faulty. */
9196 if (test_bit(Journal, &rdev->flags))
9200 * 'In_sync' is cleared while 'raid_disk' is valid, which means
9201 * replacement has just become active from pers->spare_active(), and
9202 * then pers->hot_remove_disk() will replace this rdev with replacement.
9204 if (!test_bit(In_sync, &rdev->flags))
9210 static bool rdev_is_spare(struct md_rdev *rdev)
9212 return !test_bit(Candidate, &rdev->flags) && rdev->raid_disk >= 0 &&
9213 !test_bit(In_sync, &rdev->flags) &&
9214 !test_bit(Journal, &rdev->flags) &&
9215 !test_bit(Faulty, &rdev->flags);
9218 static bool rdev_addable(struct md_rdev *rdev)
9220 /* rdev is already used, don't add it again. */
9221 if (test_bit(Candidate, &rdev->flags) || rdev->raid_disk >= 0 ||
9222 test_bit(Faulty, &rdev->flags))
9225 /* Allow to add journal disk. */
9226 if (test_bit(Journal, &rdev->flags))
9229 /* Allow to add if array is read-write. */
9230 if (md_is_rdwr(rdev->mddev))
9234 * For read-only array, only allow to readd a rdev. And if bitmap is
9235 * used, don't allow to readd a rdev that is too old.
9237 if (rdev->saved_raid_disk >= 0 && !test_bit(Bitmap_sync, &rdev->flags))
9243 static bool md_spares_need_change(struct mddev *mddev)
9245 struct md_rdev *rdev;
9248 rdev_for_each_rcu(rdev, mddev) {
9249 if (rdev_removeable(rdev) || rdev_addable(rdev)) {
9258 static int remove_and_add_spares(struct mddev *mddev,
9259 struct md_rdev *this)
9261 struct md_rdev *rdev;
9265 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9266 /* Mustn't remove devices when resync thread is running */
9269 rdev_for_each(rdev, mddev) {
9270 if ((this == NULL || rdev == this) && rdev_removeable(rdev) &&
9271 !mddev->pers->hot_remove_disk(mddev, rdev)) {
9272 sysfs_unlink_rdev(mddev, rdev);
9273 rdev->saved_raid_disk = rdev->raid_disk;
9274 rdev->raid_disk = -1;
9279 if (removed && mddev->kobj.sd)
9280 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9282 if (this && removed)
9285 rdev_for_each(rdev, mddev) {
9286 if (this && this != rdev)
9288 if (rdev_is_spare(rdev))
9290 if (!rdev_addable(rdev))
9292 if (!test_bit(Journal, &rdev->flags))
9293 rdev->recovery_offset = 0;
9294 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9295 /* failure here is OK */
9296 sysfs_link_rdev(mddev, rdev);
9297 if (!test_bit(Journal, &rdev->flags))
9300 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9305 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9309 static bool md_choose_sync_action(struct mddev *mddev, int *spares)
9311 /* Check if reshape is in progress first. */
9312 if (mddev->reshape_position != MaxSector) {
9313 if (mddev->pers->check_reshape == NULL ||
9314 mddev->pers->check_reshape(mddev) != 0)
9317 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9318 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9323 * Remove any failed drives, then add spares if possible. Spares are
9324 * also removed and re-added, to allow the personality to fail the
9327 *spares = remove_and_add_spares(mddev, NULL);
9329 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9330 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9331 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9333 /* Start new recovery. */
9334 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9338 /* Check if recovery is in progress. */
9339 if (mddev->recovery_cp < MaxSector) {
9340 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9341 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9345 /* Delay to choose resync/check/repair in md_do_sync(). */
9346 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9349 /* Nothing to be done */
9353 static void md_start_sync(struct work_struct *ws)
9355 struct mddev *mddev = container_of(ws, struct mddev, sync_work);
9357 bool suspend = false;
9359 if (md_spares_need_change(mddev))
9362 suspend ? mddev_suspend_and_lock_nointr(mddev) :
9363 mddev_lock_nointr(mddev);
9365 if (!md_is_rdwr(mddev)) {
9367 * On a read-only array we can:
9368 * - remove failed devices
9369 * - add already-in_sync devices if the array itself is in-sync.
9370 * As we only add devices that are already in-sync, we can
9371 * activate the spares immediately.
9373 remove_and_add_spares(mddev, NULL);
9377 if (!md_choose_sync_action(mddev, &spares))
9380 if (!mddev->pers->sync_request)
9384 * We are adding a device or devices to an array which has the bitmap
9385 * stored on all devices. So make sure all bitmap pages get written.
9388 md_bitmap_write_all(mddev->bitmap);
9390 rcu_assign_pointer(mddev->sync_thread,
9391 md_register_thread(md_do_sync, mddev, "resync"));
9392 if (!mddev->sync_thread) {
9393 pr_warn("%s: could not start resync thread...\n",
9395 /* leave the spares where they are, it shouldn't hurt */
9399 mddev_unlock(mddev);
9401 * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should
9402 * not set it again. Otherwise, we may cause issue like this one:
9403 * https://bugzilla.kernel.org/show_bug.cgi?id=218200
9404 * Therefore, use __mddev_resume(mddev, false).
9407 __mddev_resume(mddev, false);
9408 md_wakeup_thread(mddev->sync_thread);
9409 sysfs_notify_dirent_safe(mddev->sysfs_action);
9414 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9415 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9416 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9417 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9418 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9419 mddev_unlock(mddev);
9421 * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should
9422 * not set it again. Otherwise, we may cause issue like this one:
9423 * https://bugzilla.kernel.org/show_bug.cgi?id=218200
9424 * Therefore, use __mddev_resume(mddev, false).
9427 __mddev_resume(mddev, false);
9429 wake_up(&resync_wait);
9430 if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
9431 mddev->sysfs_action)
9432 sysfs_notify_dirent_safe(mddev->sysfs_action);
9436 * This routine is regularly called by all per-raid-array threads to
9437 * deal with generic issues like resync and super-block update.
9438 * Raid personalities that don't have a thread (linear/raid0) do not
9439 * need this as they never do any recovery or update the superblock.
9441 * It does not do any resync itself, but rather "forks" off other threads
9442 * to do that as needed.
9443 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9444 * "->recovery" and create a thread at ->sync_thread.
9445 * When the thread finishes it sets MD_RECOVERY_DONE
9446 * and wakeups up this thread which will reap the thread and finish up.
9447 * This thread also removes any faulty devices (with nr_pending == 0).
9449 * The overall approach is:
9450 * 1/ if the superblock needs updating, update it.
9451 * 2/ If a recovery thread is running, don't do anything else.
9452 * 3/ If recovery has finished, clean up, possibly marking spares active.
9453 * 4/ If there are any faulty devices, remove them.
9454 * 5/ If array is degraded, try to add spares devices
9455 * 6/ If array has spares or is not in-sync, start a resync thread.
9457 void md_check_recovery(struct mddev *mddev)
9459 if (READ_ONCE(mddev->suspended))
9463 md_bitmap_daemon_work(mddev);
9465 if (signal_pending(current)) {
9466 if (mddev->pers->sync_request && !mddev->external) {
9467 pr_debug("md: %s in immediate safe mode\n",
9469 mddev->safemode = 2;
9471 flush_signals(current);
9474 if (!md_is_rdwr(mddev) &&
9475 !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9478 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9479 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9480 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9481 (mddev->external == 0 && mddev->safemode == 1) ||
9482 (mddev->safemode == 2
9483 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9487 if (mddev_trylock(mddev)) {
9488 bool try_set_sync = mddev->safemode != 0;
9490 if (!mddev->external && mddev->safemode == 1)
9491 mddev->safemode = 0;
9493 if (!md_is_rdwr(mddev)) {
9494 struct md_rdev *rdev;
9496 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9497 /* sync_work already queued. */
9498 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9502 if (!mddev->external && mddev->in_sync)
9504 * 'Blocked' flag not needed as failed devices
9505 * will be recorded if array switched to read/write.
9506 * Leaving it set will prevent the device
9507 * from being removed.
9509 rdev_for_each(rdev, mddev)
9510 clear_bit(Blocked, &rdev->flags);
9513 * There is no thread, but we need to call
9514 * ->spare_active and clear saved_raid_disk
9516 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9517 md_reap_sync_thread(mddev);
9520 * Let md_start_sync() to remove and add rdevs to the
9523 if (md_spares_need_change(mddev)) {
9524 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9525 queue_work(md_misc_wq, &mddev->sync_work);
9528 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9529 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9530 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9535 if (mddev_is_clustered(mddev)) {
9536 struct md_rdev *rdev, *tmp;
9537 /* kick the device if another node issued a
9540 rdev_for_each_safe(rdev, tmp, mddev) {
9541 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9542 rdev->raid_disk < 0)
9543 md_kick_rdev_from_array(rdev);
9547 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9548 spin_lock(&mddev->lock);
9550 spin_unlock(&mddev->lock);
9553 if (mddev->sb_flags)
9554 md_update_sb(mddev, 0);
9557 * Never start a new sync thread if MD_RECOVERY_RUNNING is
9560 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9561 if (!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9562 /* resync/recovery still happening */
9563 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9567 if (WARN_ON_ONCE(!mddev->sync_thread))
9570 md_reap_sync_thread(mddev);
9574 /* Set RUNNING before clearing NEEDED to avoid
9575 * any transients in the value of "sync_action".
9577 mddev->curr_resync_completed = 0;
9578 spin_lock(&mddev->lock);
9579 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9580 spin_unlock(&mddev->lock);
9581 /* Clear some bits that don't mean anything, but
9584 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9585 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9587 if (test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) &&
9588 !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
9589 queue_work(md_misc_wq, &mddev->sync_work);
9591 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9592 wake_up(&resync_wait);
9596 wake_up(&mddev->sb_wait);
9597 mddev_unlock(mddev);
9600 EXPORT_SYMBOL(md_check_recovery);
9602 void md_reap_sync_thread(struct mddev *mddev)
9604 struct md_rdev *rdev;
9605 sector_t old_dev_sectors = mddev->dev_sectors;
9606 bool is_reshaped = false;
9608 /* resync has finished, collect result */
9609 md_unregister_thread(mddev, &mddev->sync_thread);
9610 atomic_inc(&mddev->sync_seq);
9612 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9613 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9614 mddev->degraded != mddev->raid_disks) {
9616 /* activate any spares */
9617 if (mddev->pers->spare_active(mddev)) {
9618 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9619 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9622 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9623 mddev->pers->finish_reshape) {
9624 mddev->pers->finish_reshape(mddev);
9625 if (mddev_is_clustered(mddev))
9629 /* If array is no-longer degraded, then any saved_raid_disk
9630 * information must be scrapped.
9632 if (!mddev->degraded)
9633 rdev_for_each(rdev, mddev)
9634 rdev->saved_raid_disk = -1;
9636 md_update_sb(mddev, 1);
9637 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9638 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9640 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9641 md_cluster_ops->resync_finish(mddev);
9642 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9643 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9644 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9645 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9646 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9647 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9649 * We call md_cluster_ops->update_size here because sync_size could
9650 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9651 * so it is time to update size across cluster.
9653 if (mddev_is_clustered(mddev) && is_reshaped
9654 && !test_bit(MD_CLOSING, &mddev->flags))
9655 md_cluster_ops->update_size(mddev, old_dev_sectors);
9656 /* flag recovery needed just to double check */
9657 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9658 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9659 sysfs_notify_dirent_safe(mddev->sysfs_action);
9661 if (mddev->event_work.func)
9662 queue_work(md_misc_wq, &mddev->event_work);
9663 wake_up(&resync_wait);
9665 EXPORT_SYMBOL(md_reap_sync_thread);
9667 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9669 sysfs_notify_dirent_safe(rdev->sysfs_state);
9670 wait_event_timeout(rdev->blocked_wait,
9671 !test_bit(Blocked, &rdev->flags) &&
9672 !test_bit(BlockedBadBlocks, &rdev->flags),
9673 msecs_to_jiffies(5000));
9674 rdev_dec_pending(rdev, mddev);
9676 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9678 void md_finish_reshape(struct mddev *mddev)
9680 /* called be personality module when reshape completes. */
9681 struct md_rdev *rdev;
9683 rdev_for_each(rdev, mddev) {
9684 if (rdev->data_offset > rdev->new_data_offset)
9685 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9687 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9688 rdev->data_offset = rdev->new_data_offset;
9691 EXPORT_SYMBOL(md_finish_reshape);
9693 /* Bad block management */
9695 /* Returns 1 on success, 0 on failure */
9696 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9699 struct mddev *mddev = rdev->mddev;
9702 s += rdev->new_data_offset;
9704 s += rdev->data_offset;
9705 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9707 /* Make sure they get written out promptly */
9708 if (test_bit(ExternalBbl, &rdev->flags))
9709 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9710 sysfs_notify_dirent_safe(rdev->sysfs_state);
9711 set_mask_bits(&mddev->sb_flags, 0,
9712 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9713 md_wakeup_thread(rdev->mddev->thread);
9718 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9720 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9725 s += rdev->new_data_offset;
9727 s += rdev->data_offset;
9728 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9729 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9730 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9733 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9735 static int md_notify_reboot(struct notifier_block *this,
9736 unsigned long code, void *x)
9738 struct mddev *mddev, *n;
9741 spin_lock(&all_mddevs_lock);
9742 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9743 if (!mddev_get(mddev))
9745 spin_unlock(&all_mddevs_lock);
9746 if (mddev_trylock(mddev)) {
9748 __md_stop_writes(mddev);
9749 if (mddev->persistent)
9750 mddev->safemode = 2;
9751 mddev_unlock(mddev);
9755 spin_lock(&all_mddevs_lock);
9757 spin_unlock(&all_mddevs_lock);
9760 * certain more exotic SCSI devices are known to be
9761 * volatile wrt too early system reboots. While the
9762 * right place to handle this issue is the given
9763 * driver, we do want to have a safe RAID driver ...
9771 static struct notifier_block md_notifier = {
9772 .notifier_call = md_notify_reboot,
9774 .priority = INT_MAX, /* before any real devices */
9777 static void md_geninit(void)
9779 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9781 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9784 static int __init md_init(void)
9788 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9792 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9796 md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND,
9801 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9805 ret = __register_blkdev(0, "mdp", md_probe);
9810 register_reboot_notifier(&md_notifier);
9811 raid_table_header = register_sysctl("dev/raid", raid_table);
9817 unregister_blkdev(MD_MAJOR, "md");
9819 destroy_workqueue(md_bitmap_wq);
9821 destroy_workqueue(md_misc_wq);
9823 destroy_workqueue(md_wq);
9828 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9830 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9831 struct md_rdev *rdev2, *tmp;
9835 * If size is changed in another node then we need to
9836 * do resize as well.
9838 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9839 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9841 pr_info("md-cluster: resize failed\n");
9843 md_bitmap_update_sb(mddev->bitmap);
9846 /* Check for change of roles in the active devices */
9847 rdev_for_each_safe(rdev2, tmp, mddev) {
9848 if (test_bit(Faulty, &rdev2->flags))
9851 /* Check if the roles changed */
9852 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9854 if (test_bit(Candidate, &rdev2->flags)) {
9855 if (role == MD_DISK_ROLE_FAULTY) {
9856 pr_info("md: Removing Candidate device %pg because add failed\n",
9858 md_kick_rdev_from_array(rdev2);
9862 clear_bit(Candidate, &rdev2->flags);
9865 if (role != rdev2->raid_disk) {
9867 * got activated except reshape is happening.
9869 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9870 !(le32_to_cpu(sb->feature_map) &
9871 MD_FEATURE_RESHAPE_ACTIVE)) {
9872 rdev2->saved_raid_disk = role;
9873 ret = remove_and_add_spares(mddev, rdev2);
9874 pr_info("Activated spare: %pg\n",
9876 /* wakeup mddev->thread here, so array could
9877 * perform resync with the new activated disk */
9878 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9879 md_wakeup_thread(mddev->thread);
9882 * We just want to do the minimum to mark the disk
9883 * as faulty. The recovery is performed by the
9884 * one who initiated the error.
9886 if (role == MD_DISK_ROLE_FAULTY ||
9887 role == MD_DISK_ROLE_JOURNAL) {
9888 md_error(mddev, rdev2);
9889 clear_bit(Blocked, &rdev2->flags);
9894 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9895 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9897 pr_warn("md: updating array disks failed. %d\n", ret);
9901 * Since mddev->delta_disks has already updated in update_raid_disks,
9902 * so it is time to check reshape.
9904 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9905 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9907 * reshape is happening in the remote node, we need to
9908 * update reshape_position and call start_reshape.
9910 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9911 if (mddev->pers->update_reshape_pos)
9912 mddev->pers->update_reshape_pos(mddev);
9913 if (mddev->pers->start_reshape)
9914 mddev->pers->start_reshape(mddev);
9915 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9916 mddev->reshape_position != MaxSector &&
9917 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9918 /* reshape is just done in another node. */
9919 mddev->reshape_position = MaxSector;
9920 if (mddev->pers->update_reshape_pos)
9921 mddev->pers->update_reshape_pos(mddev);
9924 /* Finally set the event to be up to date */
9925 mddev->events = le64_to_cpu(sb->events);
9928 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9931 struct page *swapout = rdev->sb_page;
9932 struct mdp_superblock_1 *sb;
9934 /* Store the sb page of the rdev in the swapout temporary
9935 * variable in case we err in the future
9937 rdev->sb_page = NULL;
9938 err = alloc_disk_sb(rdev);
9940 ClearPageUptodate(rdev->sb_page);
9941 rdev->sb_loaded = 0;
9942 err = super_types[mddev->major_version].
9943 load_super(rdev, NULL, mddev->minor_version);
9946 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9947 __func__, __LINE__, rdev->desc_nr, err);
9949 put_page(rdev->sb_page);
9950 rdev->sb_page = swapout;
9951 rdev->sb_loaded = 1;
9955 sb = page_address(rdev->sb_page);
9956 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9960 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9961 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9963 /* The other node finished recovery, call spare_active to set
9964 * device In_sync and mddev->degraded
9966 if (rdev->recovery_offset == MaxSector &&
9967 !test_bit(In_sync, &rdev->flags) &&
9968 mddev->pers->spare_active(mddev))
9969 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9975 void md_reload_sb(struct mddev *mddev, int nr)
9977 struct md_rdev *rdev = NULL, *iter;
9981 rdev_for_each_rcu(iter, mddev) {
9982 if (iter->desc_nr == nr) {
9989 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9993 err = read_rdev(mddev, rdev);
9997 check_sb_changes(mddev, rdev);
9999 /* Read all rdev's to update recovery_offset */
10000 rdev_for_each_rcu(rdev, mddev) {
10001 if (!test_bit(Faulty, &rdev->flags))
10002 read_rdev(mddev, rdev);
10005 EXPORT_SYMBOL(md_reload_sb);
10010 * Searches all registered partitions for autorun RAID arrays
10014 static DEFINE_MUTEX(detected_devices_mutex);
10015 static LIST_HEAD(all_detected_devices);
10016 struct detected_devices_node {
10017 struct list_head list;
10021 void md_autodetect_dev(dev_t dev)
10023 struct detected_devices_node *node_detected_dev;
10025 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
10026 if (node_detected_dev) {
10027 node_detected_dev->dev = dev;
10028 mutex_lock(&detected_devices_mutex);
10029 list_add_tail(&node_detected_dev->list, &all_detected_devices);
10030 mutex_unlock(&detected_devices_mutex);
10034 void md_autostart_arrays(int part)
10036 struct md_rdev *rdev;
10037 struct detected_devices_node *node_detected_dev;
10039 int i_scanned, i_passed;
10044 pr_info("md: Autodetecting RAID arrays.\n");
10046 mutex_lock(&detected_devices_mutex);
10047 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
10049 node_detected_dev = list_entry(all_detected_devices.next,
10050 struct detected_devices_node, list);
10051 list_del(&node_detected_dev->list);
10052 dev = node_detected_dev->dev;
10053 kfree(node_detected_dev);
10054 mutex_unlock(&detected_devices_mutex);
10055 rdev = md_import_device(dev,0, 90);
10056 mutex_lock(&detected_devices_mutex);
10060 if (test_bit(Faulty, &rdev->flags))
10063 set_bit(AutoDetected, &rdev->flags);
10064 list_add(&rdev->same_set, &pending_raid_disks);
10067 mutex_unlock(&detected_devices_mutex);
10069 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
10071 autorun_devices(part);
10074 #endif /* !MODULE */
10076 static __exit void md_exit(void)
10078 struct mddev *mddev, *n;
10081 unregister_blkdev(MD_MAJOR,"md");
10082 unregister_blkdev(mdp_major, "mdp");
10083 unregister_reboot_notifier(&md_notifier);
10084 unregister_sysctl_table(raid_table_header);
10086 /* We cannot unload the modules while some process is
10087 * waiting for us in select() or poll() - wake them up
10090 while (waitqueue_active(&md_event_waiters)) {
10091 /* not safe to leave yet */
10092 wake_up(&md_event_waiters);
10096 remove_proc_entry("mdstat", NULL);
10098 spin_lock(&all_mddevs_lock);
10099 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
10100 if (!mddev_get(mddev))
10102 spin_unlock(&all_mddevs_lock);
10103 export_array(mddev);
10105 mddev->hold_active = 0;
10107 * As the mddev is now fully clear, mddev_put will schedule
10108 * the mddev for destruction by a workqueue, and the
10109 * destroy_workqueue() below will wait for that to complete.
10112 spin_lock(&all_mddevs_lock);
10114 spin_unlock(&all_mddevs_lock);
10116 destroy_workqueue(md_misc_wq);
10117 destroy_workqueue(md_bitmap_wq);
10118 destroy_workqueue(md_wq);
10121 subsys_initcall(md_init);
10122 module_exit(md_exit)
10124 static int get_ro(char *buffer, const struct kernel_param *kp)
10126 return sprintf(buffer, "%d\n", start_readonly);
10128 static int set_ro(const char *val, const struct kernel_param *kp)
10130 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
10133 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
10134 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
10135 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
10136 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
10138 MODULE_LICENSE("GPL");
10139 MODULE_DESCRIPTION("MD RAID framework");
10140 MODULE_ALIAS("md");
10141 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);