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);
533 * Generic flush handling for md
536 static void md_end_flush(struct bio *bio)
538 struct md_rdev *rdev = bio->bi_private;
539 struct mddev *mddev = rdev->mddev;
543 rdev_dec_pending(rdev, mddev);
545 if (atomic_dec_and_test(&mddev->flush_pending)) {
546 /* The pair is percpu_ref_get() from md_flush_request() */
547 percpu_ref_put(&mddev->active_io);
549 /* The pre-request flush has finished */
550 queue_work(md_wq, &mddev->flush_work);
554 static void md_submit_flush_data(struct work_struct *ws);
556 static void submit_flushes(struct work_struct *ws)
558 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
559 struct md_rdev *rdev;
561 mddev->start_flush = ktime_get_boottime();
562 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
563 atomic_set(&mddev->flush_pending, 1);
565 rdev_for_each_rcu(rdev, mddev)
566 if (rdev->raid_disk >= 0 &&
567 !test_bit(Faulty, &rdev->flags)) {
570 atomic_inc(&rdev->nr_pending);
572 bi = bio_alloc_bioset(rdev->bdev, 0,
573 REQ_OP_WRITE | REQ_PREFLUSH,
574 GFP_NOIO, &mddev->bio_set);
575 bi->bi_end_io = md_end_flush;
576 bi->bi_private = rdev;
577 atomic_inc(&mddev->flush_pending);
582 if (atomic_dec_and_test(&mddev->flush_pending)) {
583 /* The pair is percpu_ref_get() from md_flush_request() */
584 percpu_ref_put(&mddev->active_io);
586 queue_work(md_wq, &mddev->flush_work);
590 static void md_submit_flush_data(struct work_struct *ws)
592 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
593 struct bio *bio = mddev->flush_bio;
596 * must reset flush_bio before calling into md_handle_request to avoid a
597 * deadlock, because other bios passed md_handle_request suspend check
598 * could wait for this and below md_handle_request could wait for those
599 * bios because of suspend check
601 spin_lock_irq(&mddev->lock);
602 mddev->prev_flush_start = mddev->start_flush;
603 mddev->flush_bio = NULL;
604 spin_unlock_irq(&mddev->lock);
605 wake_up(&mddev->sb_wait);
607 if (bio->bi_iter.bi_size == 0) {
608 /* an empty barrier - all done */
611 bio->bi_opf &= ~REQ_PREFLUSH;
612 md_handle_request(mddev, bio);
617 * Manages consolidation of flushes and submitting any flushes needed for
618 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
619 * being finished in another context. Returns false if the flushing is
620 * complete but still needs the I/O portion of the bio to be processed.
622 bool md_flush_request(struct mddev *mddev, struct bio *bio)
624 ktime_t req_start = ktime_get_boottime();
625 spin_lock_irq(&mddev->lock);
626 /* flush requests wait until ongoing flush completes,
627 * hence coalescing all the pending requests.
629 wait_event_lock_irq(mddev->sb_wait,
631 ktime_before(req_start, mddev->prev_flush_start),
633 /* new request after previous flush is completed */
634 if (ktime_after(req_start, mddev->prev_flush_start)) {
635 WARN_ON(mddev->flush_bio);
637 * Grab a reference to make sure mddev_suspend() will wait for
638 * this flush to be done.
640 * md_flush_reqeust() is called under md_handle_request() and
641 * 'active_io' is already grabbed, hence percpu_ref_is_zero()
642 * won't pass, percpu_ref_tryget_live() can't be used because
643 * percpu_ref_kill() can be called by mddev_suspend()
646 WARN_ON(percpu_ref_is_zero(&mddev->active_io));
647 percpu_ref_get(&mddev->active_io);
648 mddev->flush_bio = bio;
651 spin_unlock_irq(&mddev->lock);
654 INIT_WORK(&mddev->flush_work, submit_flushes);
655 queue_work(md_wq, &mddev->flush_work);
657 /* flush was performed for some other bio while we waited. */
658 if (bio->bi_iter.bi_size == 0)
659 /* an empty barrier - all done */
662 bio->bi_opf &= ~REQ_PREFLUSH;
668 EXPORT_SYMBOL(md_flush_request);
670 static inline struct mddev *mddev_get(struct mddev *mddev)
672 lockdep_assert_held(&all_mddevs_lock);
674 if (test_bit(MD_DELETED, &mddev->flags))
676 atomic_inc(&mddev->active);
680 static void mddev_delayed_delete(struct work_struct *ws);
682 static void __mddev_put(struct mddev *mddev)
684 if (mddev->raid_disks || !list_empty(&mddev->disks) ||
685 mddev->ctime || mddev->hold_active)
688 /* Array is not configured at all, and not held active, so destroy it */
689 set_bit(MD_DELETED, &mddev->flags);
692 * Call queue_work inside the spinlock so that flush_workqueue() after
693 * mddev_find will succeed in waiting for the work to be done.
695 queue_work(md_misc_wq, &mddev->del_work);
698 void mddev_put(struct mddev *mddev)
700 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
704 spin_unlock(&all_mddevs_lock);
707 static void md_safemode_timeout(struct timer_list *t);
708 static void md_start_sync(struct work_struct *ws);
710 static void active_io_release(struct percpu_ref *ref)
712 struct mddev *mddev = container_of(ref, struct mddev, active_io);
714 wake_up(&mddev->sb_wait);
717 static void no_op(struct percpu_ref *r) {}
719 int mddev_init(struct mddev *mddev)
722 if (percpu_ref_init(&mddev->active_io, active_io_release,
723 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
726 if (percpu_ref_init(&mddev->writes_pending, no_op,
727 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
728 percpu_ref_exit(&mddev->active_io);
732 /* We want to start with the refcount at zero */
733 percpu_ref_put(&mddev->writes_pending);
735 mutex_init(&mddev->open_mutex);
736 mutex_init(&mddev->reconfig_mutex);
737 mutex_init(&mddev->sync_mutex);
738 mutex_init(&mddev->suspend_mutex);
739 mutex_init(&mddev->bitmap_info.mutex);
740 INIT_LIST_HEAD(&mddev->disks);
741 INIT_LIST_HEAD(&mddev->all_mddevs);
742 INIT_LIST_HEAD(&mddev->deleting);
743 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
744 atomic_set(&mddev->active, 1);
745 atomic_set(&mddev->openers, 0);
746 atomic_set(&mddev->sync_seq, 0);
747 spin_lock_init(&mddev->lock);
748 atomic_set(&mddev->flush_pending, 0);
749 init_waitqueue_head(&mddev->sb_wait);
750 init_waitqueue_head(&mddev->recovery_wait);
751 mddev->reshape_position = MaxSector;
752 mddev->reshape_backwards = 0;
753 mddev->last_sync_action = "none";
754 mddev->resync_min = 0;
755 mddev->resync_max = MaxSector;
756 mddev->level = LEVEL_NONE;
758 INIT_WORK(&mddev->sync_work, md_start_sync);
759 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
763 EXPORT_SYMBOL_GPL(mddev_init);
765 void mddev_destroy(struct mddev *mddev)
767 percpu_ref_exit(&mddev->active_io);
768 percpu_ref_exit(&mddev->writes_pending);
770 EXPORT_SYMBOL_GPL(mddev_destroy);
772 static struct mddev *mddev_find_locked(dev_t unit)
776 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
777 if (mddev->unit == unit)
783 /* find an unused unit number */
784 static dev_t mddev_alloc_unit(void)
786 static int next_minor = 512;
787 int start = next_minor;
792 dev = MKDEV(MD_MAJOR, next_minor);
794 if (next_minor > MINORMASK)
796 if (next_minor == start)
797 return 0; /* Oh dear, all in use. */
798 is_free = !mddev_find_locked(dev);
804 static struct mddev *mddev_alloc(dev_t unit)
809 if (unit && MAJOR(unit) != MD_MAJOR)
810 unit &= ~((1 << MdpMinorShift) - 1);
812 new = kzalloc(sizeof(*new), GFP_KERNEL);
814 return ERR_PTR(-ENOMEM);
816 error = mddev_init(new);
820 spin_lock(&all_mddevs_lock);
823 if (mddev_find_locked(unit))
824 goto out_destroy_new;
826 if (MAJOR(unit) == MD_MAJOR)
827 new->md_minor = MINOR(unit);
829 new->md_minor = MINOR(unit) >> MdpMinorShift;
830 new->hold_active = UNTIL_IOCTL;
833 new->unit = mddev_alloc_unit();
835 goto out_destroy_new;
836 new->md_minor = MINOR(new->unit);
837 new->hold_active = UNTIL_STOP;
840 list_add(&new->all_mddevs, &all_mddevs);
841 spin_unlock(&all_mddevs_lock);
845 spin_unlock(&all_mddevs_lock);
849 return ERR_PTR(error);
852 static void mddev_free(struct mddev *mddev)
854 spin_lock(&all_mddevs_lock);
855 list_del(&mddev->all_mddevs);
856 spin_unlock(&all_mddevs_lock);
858 mddev_destroy(mddev);
862 static const struct attribute_group md_redundancy_group;
864 void mddev_unlock(struct mddev *mddev)
866 struct md_rdev *rdev;
870 if (!list_empty(&mddev->deleting))
871 list_splice_init(&mddev->deleting, &delete);
873 if (mddev->to_remove) {
874 /* These cannot be removed under reconfig_mutex as
875 * an access to the files will try to take reconfig_mutex
876 * while holding the file unremovable, which leads to
878 * So hold set sysfs_active while the remove in happeing,
879 * and anything else which might set ->to_remove or my
880 * otherwise change the sysfs namespace will fail with
881 * -EBUSY if sysfs_active is still set.
882 * We set sysfs_active under reconfig_mutex and elsewhere
883 * test it under the same mutex to ensure its correct value
886 const struct attribute_group *to_remove = mddev->to_remove;
887 mddev->to_remove = NULL;
888 mddev->sysfs_active = 1;
889 mutex_unlock(&mddev->reconfig_mutex);
891 if (mddev->kobj.sd) {
892 if (to_remove != &md_redundancy_group)
893 sysfs_remove_group(&mddev->kobj, to_remove);
894 if (mddev->pers == NULL ||
895 mddev->pers->sync_request == NULL) {
896 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
897 if (mddev->sysfs_action)
898 sysfs_put(mddev->sysfs_action);
899 if (mddev->sysfs_completed)
900 sysfs_put(mddev->sysfs_completed);
901 if (mddev->sysfs_degraded)
902 sysfs_put(mddev->sysfs_degraded);
903 mddev->sysfs_action = NULL;
904 mddev->sysfs_completed = NULL;
905 mddev->sysfs_degraded = NULL;
908 mddev->sysfs_active = 0;
910 mutex_unlock(&mddev->reconfig_mutex);
912 md_wakeup_thread(mddev->thread);
913 wake_up(&mddev->sb_wait);
915 list_for_each_entry_safe(rdev, tmp, &delete, same_set) {
916 list_del_init(&rdev->same_set);
917 kobject_del(&rdev->kobj);
918 export_rdev(rdev, mddev);
921 EXPORT_SYMBOL_GPL(mddev_unlock);
923 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
925 struct md_rdev *rdev;
927 rdev_for_each_rcu(rdev, mddev)
928 if (rdev->desc_nr == nr)
933 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
935 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
937 struct md_rdev *rdev;
939 rdev_for_each(rdev, mddev)
940 if (rdev->bdev->bd_dev == dev)
946 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
948 struct md_rdev *rdev;
950 rdev_for_each_rcu(rdev, mddev)
951 if (rdev->bdev->bd_dev == dev)
956 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
958 static struct md_personality *find_pers(int level, char *clevel)
960 struct md_personality *pers;
961 list_for_each_entry(pers, &pers_list, list) {
962 if (level != LEVEL_NONE && pers->level == level)
964 if (strcmp(pers->name, clevel)==0)
970 /* return the offset of the super block in 512byte sectors */
971 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
973 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
976 static int alloc_disk_sb(struct md_rdev *rdev)
978 rdev->sb_page = alloc_page(GFP_KERNEL);
984 void md_rdev_clear(struct md_rdev *rdev)
987 put_page(rdev->sb_page);
989 rdev->sb_page = NULL;
994 put_page(rdev->bb_page);
995 rdev->bb_page = NULL;
997 badblocks_exit(&rdev->badblocks);
999 EXPORT_SYMBOL_GPL(md_rdev_clear);
1001 static void super_written(struct bio *bio)
1003 struct md_rdev *rdev = bio->bi_private;
1004 struct mddev *mddev = rdev->mddev;
1006 if (bio->bi_status) {
1007 pr_err("md: %s gets error=%d\n", __func__,
1008 blk_status_to_errno(bio->bi_status));
1009 md_error(mddev, rdev);
1010 if (!test_bit(Faulty, &rdev->flags)
1011 && (bio->bi_opf & MD_FAILFAST)) {
1012 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
1013 set_bit(LastDev, &rdev->flags);
1016 clear_bit(LastDev, &rdev->flags);
1020 rdev_dec_pending(rdev, mddev);
1022 if (atomic_dec_and_test(&mddev->pending_writes))
1023 wake_up(&mddev->sb_wait);
1026 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
1027 sector_t sector, int size, struct page *page)
1029 /* write first size bytes of page to sector of rdev
1030 * Increment mddev->pending_writes before returning
1031 * and decrement it on completion, waking up sb_wait
1032 * if zero is reached.
1033 * If an error occurred, call md_error
1040 if (test_bit(Faulty, &rdev->flags))
1043 bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
1045 REQ_OP_WRITE | REQ_SYNC | REQ_IDLE | REQ_META
1046 | REQ_PREFLUSH | REQ_FUA,
1047 GFP_NOIO, &mddev->sync_set);
1049 atomic_inc(&rdev->nr_pending);
1051 bio->bi_iter.bi_sector = sector;
1052 __bio_add_page(bio, page, size, 0);
1053 bio->bi_private = rdev;
1054 bio->bi_end_io = super_written;
1056 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
1057 test_bit(FailFast, &rdev->flags) &&
1058 !test_bit(LastDev, &rdev->flags))
1059 bio->bi_opf |= MD_FAILFAST;
1061 atomic_inc(&mddev->pending_writes);
1065 int md_super_wait(struct mddev *mddev)
1067 /* wait for all superblock writes that were scheduled to complete */
1068 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
1069 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
1074 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
1075 struct page *page, blk_opf_t opf, bool metadata_op)
1078 struct bio_vec bvec;
1080 if (metadata_op && rdev->meta_bdev)
1081 bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
1083 bio_init(&bio, rdev->bdev, &bvec, 1, opf);
1086 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1087 else if (rdev->mddev->reshape_position != MaxSector &&
1088 (rdev->mddev->reshape_backwards ==
1089 (sector >= rdev->mddev->reshape_position)))
1090 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1092 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1093 __bio_add_page(&bio, page, size, 0);
1095 submit_bio_wait(&bio);
1097 return !bio.bi_status;
1099 EXPORT_SYMBOL_GPL(sync_page_io);
1101 static int read_disk_sb(struct md_rdev *rdev, int size)
1103 if (rdev->sb_loaded)
1106 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true))
1108 rdev->sb_loaded = 1;
1112 pr_err("md: disabled device %pg, could not read superblock.\n",
1117 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1119 return sb1->set_uuid0 == sb2->set_uuid0 &&
1120 sb1->set_uuid1 == sb2->set_uuid1 &&
1121 sb1->set_uuid2 == sb2->set_uuid2 &&
1122 sb1->set_uuid3 == sb2->set_uuid3;
1125 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1128 mdp_super_t *tmp1, *tmp2;
1130 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1131 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1133 if (!tmp1 || !tmp2) {
1142 * nr_disks is not constant
1147 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1154 static u32 md_csum_fold(u32 csum)
1156 csum = (csum & 0xffff) + (csum >> 16);
1157 return (csum & 0xffff) + (csum >> 16);
1160 static unsigned int calc_sb_csum(mdp_super_t *sb)
1163 u32 *sb32 = (u32*)sb;
1165 unsigned int disk_csum, csum;
1167 disk_csum = sb->sb_csum;
1170 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1172 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1175 /* This used to use csum_partial, which was wrong for several
1176 * reasons including that different results are returned on
1177 * different architectures. It isn't critical that we get exactly
1178 * the same return value as before (we always csum_fold before
1179 * testing, and that removes any differences). However as we
1180 * know that csum_partial always returned a 16bit value on
1181 * alphas, do a fold to maximise conformity to previous behaviour.
1183 sb->sb_csum = md_csum_fold(disk_csum);
1185 sb->sb_csum = disk_csum;
1191 * Handle superblock details.
1192 * We want to be able to handle multiple superblock formats
1193 * so we have a common interface to them all, and an array of
1194 * different handlers.
1195 * We rely on user-space to write the initial superblock, and support
1196 * reading and updating of superblocks.
1197 * Interface methods are:
1198 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1199 * loads and validates a superblock on dev.
1200 * if refdev != NULL, compare superblocks on both devices
1202 * 0 - dev has a superblock that is compatible with refdev
1203 * 1 - dev has a superblock that is compatible and newer than refdev
1204 * so dev should be used as the refdev in future
1205 * -EINVAL superblock incompatible or invalid
1206 * -othererror e.g. -EIO
1208 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1209 * Verify that dev is acceptable into mddev.
1210 * The first time, mddev->raid_disks will be 0, and data from
1211 * dev should be merged in. Subsequent calls check that dev
1212 * is new enough. Return 0 or -EINVAL
1214 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1215 * Update the superblock for rdev with data in mddev
1216 * This does not write to disc.
1222 struct module *owner;
1223 int (*load_super)(struct md_rdev *rdev,
1224 struct md_rdev *refdev,
1226 int (*validate_super)(struct mddev *mddev,
1227 struct md_rdev *freshest,
1228 struct md_rdev *rdev);
1229 void (*sync_super)(struct mddev *mddev,
1230 struct md_rdev *rdev);
1231 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1232 sector_t num_sectors);
1233 int (*allow_new_offset)(struct md_rdev *rdev,
1234 unsigned long long new_offset);
1238 * Check that the given mddev has no bitmap.
1240 * This function is called from the run method of all personalities that do not
1241 * support bitmaps. It prints an error message and returns non-zero if mddev
1242 * has a bitmap. Otherwise, it returns 0.
1245 int md_check_no_bitmap(struct mddev *mddev)
1247 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1249 pr_warn("%s: bitmaps are not supported for %s\n",
1250 mdname(mddev), mddev->pers->name);
1253 EXPORT_SYMBOL(md_check_no_bitmap);
1256 * load_super for 0.90.0
1258 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1262 bool spare_disk = true;
1265 * Calculate the position of the superblock (512byte sectors),
1266 * it's at the end of the disk.
1268 * It also happens to be a multiple of 4Kb.
1270 rdev->sb_start = calc_dev_sboffset(rdev);
1272 ret = read_disk_sb(rdev, MD_SB_BYTES);
1278 sb = page_address(rdev->sb_page);
1280 if (sb->md_magic != MD_SB_MAGIC) {
1281 pr_warn("md: invalid raid superblock magic on %pg\n",
1286 if (sb->major_version != 0 ||
1287 sb->minor_version < 90 ||
1288 sb->minor_version > 91) {
1289 pr_warn("Bad version number %d.%d on %pg\n",
1290 sb->major_version, sb->minor_version, rdev->bdev);
1294 if (sb->raid_disks <= 0)
1297 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1298 pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
1302 rdev->preferred_minor = sb->md_minor;
1303 rdev->data_offset = 0;
1304 rdev->new_data_offset = 0;
1305 rdev->sb_size = MD_SB_BYTES;
1306 rdev->badblocks.shift = -1;
1308 if (sb->level == LEVEL_MULTIPATH)
1311 rdev->desc_nr = sb->this_disk.number;
1313 /* not spare disk, or LEVEL_MULTIPATH */
1314 if (sb->level == LEVEL_MULTIPATH ||
1315 (rdev->desc_nr >= 0 &&
1316 rdev->desc_nr < MD_SB_DISKS &&
1317 sb->disks[rdev->desc_nr].state &
1318 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1328 mdp_super_t *refsb = page_address(refdev->sb_page);
1329 if (!md_uuid_equal(refsb, sb)) {
1330 pr_warn("md: %pg has different UUID to %pg\n",
1331 rdev->bdev, refdev->bdev);
1334 if (!md_sb_equal(refsb, sb)) {
1335 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1336 rdev->bdev, refdev->bdev);
1340 ev2 = md_event(refsb);
1342 if (!spare_disk && ev1 > ev2)
1347 rdev->sectors = rdev->sb_start;
1348 /* Limit to 4TB as metadata cannot record more than that.
1349 * (not needed for Linear and RAID0 as metadata doesn't
1352 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1353 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1355 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1356 /* "this cannot possibly happen" ... */
1364 * validate_super for 0.90.0
1365 * note: we are not using "freshest" for 0.9 superblock
1367 static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1370 mdp_super_t *sb = page_address(rdev->sb_page);
1371 __u64 ev1 = md_event(sb);
1373 rdev->raid_disk = -1;
1374 clear_bit(Faulty, &rdev->flags);
1375 clear_bit(In_sync, &rdev->flags);
1376 clear_bit(Bitmap_sync, &rdev->flags);
1377 clear_bit(WriteMostly, &rdev->flags);
1379 if (mddev->raid_disks == 0) {
1380 mddev->major_version = 0;
1381 mddev->minor_version = sb->minor_version;
1382 mddev->patch_version = sb->patch_version;
1383 mddev->external = 0;
1384 mddev->chunk_sectors = sb->chunk_size >> 9;
1385 mddev->ctime = sb->ctime;
1386 mddev->utime = sb->utime;
1387 mddev->level = sb->level;
1388 mddev->clevel[0] = 0;
1389 mddev->layout = sb->layout;
1390 mddev->raid_disks = sb->raid_disks;
1391 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1392 mddev->events = ev1;
1393 mddev->bitmap_info.offset = 0;
1394 mddev->bitmap_info.space = 0;
1395 /* bitmap can use 60 K after the 4K superblocks */
1396 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1397 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1398 mddev->reshape_backwards = 0;
1400 if (mddev->minor_version >= 91) {
1401 mddev->reshape_position = sb->reshape_position;
1402 mddev->delta_disks = sb->delta_disks;
1403 mddev->new_level = sb->new_level;
1404 mddev->new_layout = sb->new_layout;
1405 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1406 if (mddev->delta_disks < 0)
1407 mddev->reshape_backwards = 1;
1409 mddev->reshape_position = MaxSector;
1410 mddev->delta_disks = 0;
1411 mddev->new_level = mddev->level;
1412 mddev->new_layout = mddev->layout;
1413 mddev->new_chunk_sectors = mddev->chunk_sectors;
1415 if (mddev->level == 0)
1418 if (sb->state & (1<<MD_SB_CLEAN))
1419 mddev->recovery_cp = MaxSector;
1421 if (sb->events_hi == sb->cp_events_hi &&
1422 sb->events_lo == sb->cp_events_lo) {
1423 mddev->recovery_cp = sb->recovery_cp;
1425 mddev->recovery_cp = 0;
1428 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1429 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1430 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1431 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1433 mddev->max_disks = MD_SB_DISKS;
1435 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1436 mddev->bitmap_info.file == NULL) {
1437 mddev->bitmap_info.offset =
1438 mddev->bitmap_info.default_offset;
1439 mddev->bitmap_info.space =
1440 mddev->bitmap_info.default_space;
1443 } else if (mddev->pers == NULL) {
1444 /* Insist on good event counter while assembling, except
1445 * for spares (which don't need an event count) */
1447 if (sb->disks[rdev->desc_nr].state & (
1448 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1449 if (ev1 < mddev->events)
1451 } else if (mddev->bitmap) {
1452 /* if adding to array with a bitmap, then we can accept an
1453 * older device ... but not too old.
1455 if (ev1 < mddev->bitmap->events_cleared)
1457 if (ev1 < mddev->events)
1458 set_bit(Bitmap_sync, &rdev->flags);
1460 if (ev1 < mddev->events)
1461 /* just a hot-add of a new device, leave raid_disk at -1 */
1465 if (mddev->level != LEVEL_MULTIPATH) {
1466 desc = sb->disks + rdev->desc_nr;
1468 if (desc->state & (1<<MD_DISK_FAULTY))
1469 set_bit(Faulty, &rdev->flags);
1470 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1471 desc->raid_disk < mddev->raid_disks */) {
1472 set_bit(In_sync, &rdev->flags);
1473 rdev->raid_disk = desc->raid_disk;
1474 rdev->saved_raid_disk = desc->raid_disk;
1475 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1476 /* active but not in sync implies recovery up to
1477 * reshape position. We don't know exactly where
1478 * that is, so set to zero for now */
1479 if (mddev->minor_version >= 91) {
1480 rdev->recovery_offset = 0;
1481 rdev->raid_disk = desc->raid_disk;
1484 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1485 set_bit(WriteMostly, &rdev->flags);
1486 if (desc->state & (1<<MD_DISK_FAILFAST))
1487 set_bit(FailFast, &rdev->flags);
1488 } else /* MULTIPATH are always insync */
1489 set_bit(In_sync, &rdev->flags);
1494 * sync_super for 0.90.0
1496 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1499 struct md_rdev *rdev2;
1500 int next_spare = mddev->raid_disks;
1502 /* make rdev->sb match mddev data..
1505 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1506 * 3/ any empty disks < next_spare become removed
1508 * disks[0] gets initialised to REMOVED because
1509 * we cannot be sure from other fields if it has
1510 * been initialised or not.
1513 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1515 rdev->sb_size = MD_SB_BYTES;
1517 sb = page_address(rdev->sb_page);
1519 memset(sb, 0, sizeof(*sb));
1521 sb->md_magic = MD_SB_MAGIC;
1522 sb->major_version = mddev->major_version;
1523 sb->patch_version = mddev->patch_version;
1524 sb->gvalid_words = 0; /* ignored */
1525 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1526 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1527 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1528 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1530 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1531 sb->level = mddev->level;
1532 sb->size = mddev->dev_sectors / 2;
1533 sb->raid_disks = mddev->raid_disks;
1534 sb->md_minor = mddev->md_minor;
1535 sb->not_persistent = 0;
1536 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1538 sb->events_hi = (mddev->events>>32);
1539 sb->events_lo = (u32)mddev->events;
1541 if (mddev->reshape_position == MaxSector)
1542 sb->minor_version = 90;
1544 sb->minor_version = 91;
1545 sb->reshape_position = mddev->reshape_position;
1546 sb->new_level = mddev->new_level;
1547 sb->delta_disks = mddev->delta_disks;
1548 sb->new_layout = mddev->new_layout;
1549 sb->new_chunk = mddev->new_chunk_sectors << 9;
1551 mddev->minor_version = sb->minor_version;
1554 sb->recovery_cp = mddev->recovery_cp;
1555 sb->cp_events_hi = (mddev->events>>32);
1556 sb->cp_events_lo = (u32)mddev->events;
1557 if (mddev->recovery_cp == MaxSector)
1558 sb->state = (1<< MD_SB_CLEAN);
1560 sb->recovery_cp = 0;
1562 sb->layout = mddev->layout;
1563 sb->chunk_size = mddev->chunk_sectors << 9;
1565 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1566 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1568 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1569 rdev_for_each(rdev2, mddev) {
1572 int is_active = test_bit(In_sync, &rdev2->flags);
1574 if (rdev2->raid_disk >= 0 &&
1575 sb->minor_version >= 91)
1576 /* we have nowhere to store the recovery_offset,
1577 * but if it is not below the reshape_position,
1578 * we can piggy-back on that.
1581 if (rdev2->raid_disk < 0 ||
1582 test_bit(Faulty, &rdev2->flags))
1585 desc_nr = rdev2->raid_disk;
1587 desc_nr = next_spare++;
1588 rdev2->desc_nr = desc_nr;
1589 d = &sb->disks[rdev2->desc_nr];
1591 d->number = rdev2->desc_nr;
1592 d->major = MAJOR(rdev2->bdev->bd_dev);
1593 d->minor = MINOR(rdev2->bdev->bd_dev);
1595 d->raid_disk = rdev2->raid_disk;
1597 d->raid_disk = rdev2->desc_nr; /* compatibility */
1598 if (test_bit(Faulty, &rdev2->flags))
1599 d->state = (1<<MD_DISK_FAULTY);
1600 else if (is_active) {
1601 d->state = (1<<MD_DISK_ACTIVE);
1602 if (test_bit(In_sync, &rdev2->flags))
1603 d->state |= (1<<MD_DISK_SYNC);
1611 if (test_bit(WriteMostly, &rdev2->flags))
1612 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1613 if (test_bit(FailFast, &rdev2->flags))
1614 d->state |= (1<<MD_DISK_FAILFAST);
1616 /* now set the "removed" and "faulty" bits on any missing devices */
1617 for (i=0 ; i < mddev->raid_disks ; i++) {
1618 mdp_disk_t *d = &sb->disks[i];
1619 if (d->state == 0 && d->number == 0) {
1622 d->state = (1<<MD_DISK_REMOVED);
1623 d->state |= (1<<MD_DISK_FAULTY);
1627 sb->nr_disks = nr_disks;
1628 sb->active_disks = active;
1629 sb->working_disks = working;
1630 sb->failed_disks = failed;
1631 sb->spare_disks = spare;
1633 sb->this_disk = sb->disks[rdev->desc_nr];
1634 sb->sb_csum = calc_sb_csum(sb);
1638 * rdev_size_change for 0.90.0
1640 static unsigned long long
1641 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1643 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1644 return 0; /* component must fit device */
1645 if (rdev->mddev->bitmap_info.offset)
1646 return 0; /* can't move bitmap */
1647 rdev->sb_start = calc_dev_sboffset(rdev);
1648 if (!num_sectors || num_sectors > rdev->sb_start)
1649 num_sectors = rdev->sb_start;
1650 /* Limit to 4TB as metadata cannot record more than that.
1651 * 4TB == 2^32 KB, or 2*2^32 sectors.
1653 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1654 num_sectors = (sector_t)(2ULL << 32) - 2;
1656 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1658 } while (md_super_wait(rdev->mddev) < 0);
1663 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1665 /* non-zero offset changes not possible with v0.90 */
1666 return new_offset == 0;
1670 * version 1 superblock
1673 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1677 unsigned long long newcsum;
1678 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1679 __le32 *isuper = (__le32*)sb;
1681 disk_csum = sb->sb_csum;
1684 for (; size >= 4; size -= 4)
1685 newcsum += le32_to_cpu(*isuper++);
1688 newcsum += le16_to_cpu(*(__le16*) isuper);
1690 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1691 sb->sb_csum = disk_csum;
1692 return cpu_to_le32(csum);
1695 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1697 struct mdp_superblock_1 *sb;
1702 bool spare_disk = true;
1705 * Calculate the position of the superblock in 512byte sectors.
1706 * It is always aligned to a 4K boundary and
1707 * depeding on minor_version, it can be:
1708 * 0: At least 8K, but less than 12K, from end of device
1709 * 1: At start of device
1710 * 2: 4K from start of device.
1712 switch(minor_version) {
1714 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1715 sb_start &= ~(sector_t)(4*2-1);
1726 rdev->sb_start = sb_start;
1728 /* superblock is rarely larger than 1K, but it can be larger,
1729 * and it is safe to read 4k, so we do that
1731 ret = read_disk_sb(rdev, 4096);
1732 if (ret) return ret;
1734 sb = page_address(rdev->sb_page);
1736 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1737 sb->major_version != cpu_to_le32(1) ||
1738 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1739 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1740 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1743 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1744 pr_warn("md: invalid superblock checksum on %pg\n",
1748 if (le64_to_cpu(sb->data_size) < 10) {
1749 pr_warn("md: data_size too small on %pg\n",
1755 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1756 /* Some padding is non-zero, might be a new feature */
1759 rdev->preferred_minor = 0xffff;
1760 rdev->data_offset = le64_to_cpu(sb->data_offset);
1761 rdev->new_data_offset = rdev->data_offset;
1762 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1763 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1764 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1765 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1767 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1768 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1769 if (rdev->sb_size & bmask)
1770 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1773 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1776 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1779 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1782 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1784 if (!rdev->bb_page) {
1785 rdev->bb_page = alloc_page(GFP_KERNEL);
1789 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1790 rdev->badblocks.count == 0) {
1791 /* need to load the bad block list.
1792 * Currently we limit it to one page.
1798 int sectors = le16_to_cpu(sb->bblog_size);
1799 if (sectors > (PAGE_SIZE / 512))
1801 offset = le32_to_cpu(sb->bblog_offset);
1804 bb_sector = (long long)offset;
1805 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1806 rdev->bb_page, REQ_OP_READ, true))
1808 bbp = (__le64 *)page_address(rdev->bb_page);
1809 rdev->badblocks.shift = sb->bblog_shift;
1810 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1811 u64 bb = le64_to_cpu(*bbp);
1812 int count = bb & (0x3ff);
1813 u64 sector = bb >> 10;
1814 sector <<= sb->bblog_shift;
1815 count <<= sb->bblog_shift;
1818 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1821 } else if (sb->bblog_offset != 0)
1822 rdev->badblocks.shift = 0;
1824 if ((le32_to_cpu(sb->feature_map) &
1825 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1826 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1827 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1828 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1831 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1835 /* not spare disk, or LEVEL_MULTIPATH */
1836 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1837 (rdev->desc_nr >= 0 &&
1838 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);
1884 rdev->raid_disk = -1;
1885 clear_bit(Faulty, &rdev->flags);
1886 clear_bit(In_sync, &rdev->flags);
1887 clear_bit(Bitmap_sync, &rdev->flags);
1888 clear_bit(WriteMostly, &rdev->flags);
1890 if (mddev->raid_disks == 0) {
1891 mddev->major_version = 1;
1892 mddev->patch_version = 0;
1893 mddev->external = 0;
1894 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1895 mddev->ctime = le64_to_cpu(sb->ctime);
1896 mddev->utime = le64_to_cpu(sb->utime);
1897 mddev->level = le32_to_cpu(sb->level);
1898 mddev->clevel[0] = 0;
1899 mddev->layout = le32_to_cpu(sb->layout);
1900 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1901 mddev->dev_sectors = le64_to_cpu(sb->size);
1902 mddev->events = ev1;
1903 mddev->bitmap_info.offset = 0;
1904 mddev->bitmap_info.space = 0;
1905 /* Default location for bitmap is 1K after superblock
1906 * using 3K - total of 4K
1908 mddev->bitmap_info.default_offset = 1024 >> 9;
1909 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1910 mddev->reshape_backwards = 0;
1912 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1913 memcpy(mddev->uuid, sb->set_uuid, 16);
1915 mddev->max_disks = (4096-256)/2;
1917 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1918 mddev->bitmap_info.file == NULL) {
1919 mddev->bitmap_info.offset =
1920 (__s32)le32_to_cpu(sb->bitmap_offset);
1921 /* Metadata doesn't record how much space is available.
1922 * For 1.0, we assume we can use up to the superblock
1923 * if before, else to 4K beyond superblock.
1924 * For others, assume no change is possible.
1926 if (mddev->minor_version > 0)
1927 mddev->bitmap_info.space = 0;
1928 else if (mddev->bitmap_info.offset > 0)
1929 mddev->bitmap_info.space =
1930 8 - mddev->bitmap_info.offset;
1932 mddev->bitmap_info.space =
1933 -mddev->bitmap_info.offset;
1936 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1937 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1938 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1939 mddev->new_level = le32_to_cpu(sb->new_level);
1940 mddev->new_layout = le32_to_cpu(sb->new_layout);
1941 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1942 if (mddev->delta_disks < 0 ||
1943 (mddev->delta_disks == 0 &&
1944 (le32_to_cpu(sb->feature_map)
1945 & MD_FEATURE_RESHAPE_BACKWARDS)))
1946 mddev->reshape_backwards = 1;
1948 mddev->reshape_position = MaxSector;
1949 mddev->delta_disks = 0;
1950 mddev->new_level = mddev->level;
1951 mddev->new_layout = mddev->layout;
1952 mddev->new_chunk_sectors = mddev->chunk_sectors;
1955 if (mddev->level == 0 &&
1956 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1959 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1960 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1962 if (le32_to_cpu(sb->feature_map) &
1963 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1964 if (le32_to_cpu(sb->feature_map) &
1965 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1967 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1968 (le32_to_cpu(sb->feature_map) &
1969 MD_FEATURE_MULTIPLE_PPLS))
1971 set_bit(MD_HAS_PPL, &mddev->flags);
1973 } else if (mddev->pers == NULL) {
1974 /* Insist of good event counter while assembling, except for
1975 * spares (which don't need an event count).
1976 * Similar to mdadm, we allow event counter difference of 1
1977 * from the freshest device.
1979 if (rdev->desc_nr >= 0 &&
1980 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1981 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1982 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1983 if (ev1 + 1 < mddev->events)
1985 } else if (mddev->bitmap) {
1986 /* If adding to array with a bitmap, then we can accept an
1987 * older device, but not too old.
1989 if (ev1 < mddev->bitmap->events_cleared)
1991 if (ev1 < mddev->events)
1992 set_bit(Bitmap_sync, &rdev->flags);
1994 if (ev1 < mddev->events)
1995 /* just a hot-add of a new device, leave raid_disk at -1 */
1998 if (mddev->level != LEVEL_MULTIPATH) {
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);
2078 } else /* MULTIPATH are always insync */
2079 set_bit(In_sync, &rdev->flags);
2084 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
2086 struct mdp_superblock_1 *sb;
2087 struct md_rdev *rdev2;
2089 /* make rdev->sb match mddev and rdev data. */
2091 sb = page_address(rdev->sb_page);
2093 sb->feature_map = 0;
2095 sb->recovery_offset = cpu_to_le64(0);
2096 memset(sb->pad3, 0, sizeof(sb->pad3));
2098 sb->utime = cpu_to_le64((__u64)mddev->utime);
2099 sb->events = cpu_to_le64(mddev->events);
2101 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
2102 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
2103 sb->resync_offset = cpu_to_le64(MaxSector);
2105 sb->resync_offset = cpu_to_le64(0);
2107 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2109 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2110 sb->size = cpu_to_le64(mddev->dev_sectors);
2111 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2112 sb->level = cpu_to_le32(mddev->level);
2113 sb->layout = cpu_to_le32(mddev->layout);
2114 if (test_bit(FailFast, &rdev->flags))
2115 sb->devflags |= FailFast1;
2117 sb->devflags &= ~FailFast1;
2119 if (test_bit(WriteMostly, &rdev->flags))
2120 sb->devflags |= WriteMostly1;
2122 sb->devflags &= ~WriteMostly1;
2123 sb->data_offset = cpu_to_le64(rdev->data_offset);
2124 sb->data_size = cpu_to_le64(rdev->sectors);
2126 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2127 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2128 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2131 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2132 !test_bit(In_sync, &rdev->flags)) {
2134 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2135 sb->recovery_offset =
2136 cpu_to_le64(rdev->recovery_offset);
2137 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2139 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2141 /* Note: recovery_offset and journal_tail share space */
2142 if (test_bit(Journal, &rdev->flags))
2143 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2144 if (test_bit(Replacement, &rdev->flags))
2146 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2148 if (mddev->reshape_position != MaxSector) {
2149 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2150 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2151 sb->new_layout = cpu_to_le32(mddev->new_layout);
2152 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2153 sb->new_level = cpu_to_le32(mddev->new_level);
2154 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2155 if (mddev->delta_disks == 0 &&
2156 mddev->reshape_backwards)
2158 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2159 if (rdev->new_data_offset != rdev->data_offset) {
2161 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2162 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2163 - rdev->data_offset));
2167 if (mddev_is_clustered(mddev))
2168 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2170 if (rdev->badblocks.count == 0)
2171 /* Nothing to do for bad blocks*/ ;
2172 else if (sb->bblog_offset == 0)
2173 /* Cannot record bad blocks on this device */
2174 md_error(mddev, rdev);
2176 struct badblocks *bb = &rdev->badblocks;
2177 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2179 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2184 seq = read_seqbegin(&bb->lock);
2186 memset(bbp, 0xff, PAGE_SIZE);
2188 for (i = 0 ; i < bb->count ; i++) {
2189 u64 internal_bb = p[i];
2190 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2191 | BB_LEN(internal_bb));
2192 bbp[i] = cpu_to_le64(store_bb);
2195 if (read_seqretry(&bb->lock, seq))
2198 bb->sector = (rdev->sb_start +
2199 (int)le32_to_cpu(sb->bblog_offset));
2200 bb->size = le16_to_cpu(sb->bblog_size);
2205 rdev_for_each(rdev2, mddev)
2206 if (rdev2->desc_nr+1 > max_dev)
2207 max_dev = rdev2->desc_nr+1;
2209 if (max_dev > le32_to_cpu(sb->max_dev)) {
2211 sb->max_dev = cpu_to_le32(max_dev);
2212 rdev->sb_size = max_dev * 2 + 256;
2213 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2214 if (rdev->sb_size & bmask)
2215 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2217 max_dev = le32_to_cpu(sb->max_dev);
2219 for (i=0; i<max_dev;i++)
2220 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2222 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2223 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2225 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2226 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2228 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2230 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2231 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2232 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2235 rdev_for_each(rdev2, mddev) {
2237 if (test_bit(Faulty, &rdev2->flags))
2238 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2239 else if (test_bit(In_sync, &rdev2->flags))
2240 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2241 else if (test_bit(Journal, &rdev2->flags))
2242 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2243 else if (rdev2->raid_disk >= 0)
2244 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2246 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2249 sb->sb_csum = calc_sb_1_csum(sb);
2252 static sector_t super_1_choose_bm_space(sector_t dev_size)
2256 /* if the device is bigger than 8Gig, save 64k for bitmap
2257 * usage, if bigger than 200Gig, save 128k
2259 if (dev_size < 64*2)
2261 else if (dev_size - 64*2 >= 200*1024*1024*2)
2263 else if (dev_size - 4*2 > 8*1024*1024*2)
2270 static unsigned long long
2271 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2273 struct mdp_superblock_1 *sb;
2274 sector_t max_sectors;
2275 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2276 return 0; /* component must fit device */
2277 if (rdev->data_offset != rdev->new_data_offset)
2278 return 0; /* too confusing */
2279 if (rdev->sb_start < rdev->data_offset) {
2280 /* minor versions 1 and 2; superblock before data */
2281 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2282 if (!num_sectors || num_sectors > max_sectors)
2283 num_sectors = max_sectors;
2284 } else if (rdev->mddev->bitmap_info.offset) {
2285 /* minor version 0 with bitmap we can't move */
2288 /* minor version 0; superblock after data */
2289 sector_t sb_start, bm_space;
2290 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2292 /* 8K is for superblock */
2293 sb_start = dev_size - 8*2;
2294 sb_start &= ~(sector_t)(4*2 - 1);
2296 bm_space = super_1_choose_bm_space(dev_size);
2298 /* Space that can be used to store date needs to decrease
2299 * superblock bitmap space and bad block space(4K)
2301 max_sectors = sb_start - bm_space - 4*2;
2303 if (!num_sectors || num_sectors > max_sectors)
2304 num_sectors = max_sectors;
2305 rdev->sb_start = sb_start;
2307 sb = page_address(rdev->sb_page);
2308 sb->data_size = cpu_to_le64(num_sectors);
2309 sb->super_offset = cpu_to_le64(rdev->sb_start);
2310 sb->sb_csum = calc_sb_1_csum(sb);
2312 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2314 } while (md_super_wait(rdev->mddev) < 0);
2320 super_1_allow_new_offset(struct md_rdev *rdev,
2321 unsigned long long new_offset)
2323 /* All necessary checks on new >= old have been done */
2324 struct bitmap *bitmap;
2325 if (new_offset >= rdev->data_offset)
2328 /* with 1.0 metadata, there is no metadata to tread on
2329 * so we can always move back */
2330 if (rdev->mddev->minor_version == 0)
2333 /* otherwise we must be sure not to step on
2334 * any metadata, so stay:
2335 * 36K beyond start of superblock
2336 * beyond end of badblocks
2337 * beyond write-intent bitmap
2339 if (rdev->sb_start + (32+4)*2 > new_offset)
2341 bitmap = rdev->mddev->bitmap;
2342 if (bitmap && !rdev->mddev->bitmap_info.file &&
2343 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2344 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2346 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2352 static struct super_type super_types[] = {
2355 .owner = THIS_MODULE,
2356 .load_super = super_90_load,
2357 .validate_super = super_90_validate,
2358 .sync_super = super_90_sync,
2359 .rdev_size_change = super_90_rdev_size_change,
2360 .allow_new_offset = super_90_allow_new_offset,
2364 .owner = THIS_MODULE,
2365 .load_super = super_1_load,
2366 .validate_super = super_1_validate,
2367 .sync_super = super_1_sync,
2368 .rdev_size_change = super_1_rdev_size_change,
2369 .allow_new_offset = super_1_allow_new_offset,
2373 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2375 if (mddev->sync_super) {
2376 mddev->sync_super(mddev, rdev);
2380 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2382 super_types[mddev->major_version].sync_super(mddev, rdev);
2385 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2387 struct md_rdev *rdev, *rdev2;
2390 rdev_for_each_rcu(rdev, mddev1) {
2391 if (test_bit(Faulty, &rdev->flags) ||
2392 test_bit(Journal, &rdev->flags) ||
2393 rdev->raid_disk == -1)
2395 rdev_for_each_rcu(rdev2, mddev2) {
2396 if (test_bit(Faulty, &rdev2->flags) ||
2397 test_bit(Journal, &rdev2->flags) ||
2398 rdev2->raid_disk == -1)
2400 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2410 static LIST_HEAD(pending_raid_disks);
2413 * Try to register data integrity profile for an mddev
2415 * This is called when an array is started and after a disk has been kicked
2416 * from the array. It only succeeds if all working and active component devices
2417 * are integrity capable with matching profiles.
2419 int md_integrity_register(struct mddev *mddev)
2421 struct md_rdev *rdev, *reference = NULL;
2423 if (list_empty(&mddev->disks))
2424 return 0; /* nothing to do */
2425 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2426 return 0; /* shouldn't register, or already is */
2427 rdev_for_each(rdev, mddev) {
2428 /* skip spares and non-functional disks */
2429 if (test_bit(Faulty, &rdev->flags))
2431 if (rdev->raid_disk < 0)
2434 /* Use the first rdev as the reference */
2438 /* does this rdev's profile match the reference profile? */
2439 if (blk_integrity_compare(reference->bdev->bd_disk,
2440 rdev->bdev->bd_disk) < 0)
2443 if (!reference || !bdev_get_integrity(reference->bdev))
2446 * All component devices are integrity capable and have matching
2447 * profiles, register the common profile for the md device.
2449 blk_integrity_register(mddev->gendisk,
2450 bdev_get_integrity(reference->bdev));
2452 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2453 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2454 (mddev->level != 1 && mddev->level != 10 &&
2455 bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) {
2457 * No need to handle the failure of bioset_integrity_create,
2458 * because the function is called by md_run() -> pers->run(),
2459 * md_run calls bioset_exit -> bioset_integrity_free in case
2462 pr_err("md: failed to create integrity pool for %s\n",
2468 EXPORT_SYMBOL(md_integrity_register);
2471 * Attempt to add an rdev, but only if it is consistent with the current
2474 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2476 struct blk_integrity *bi_mddev;
2478 if (!mddev->gendisk)
2481 bi_mddev = blk_get_integrity(mddev->gendisk);
2483 if (!bi_mddev) /* nothing to do */
2486 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2487 pr_err("%s: incompatible integrity profile for %pg\n",
2488 mdname(mddev), rdev->bdev);
2494 EXPORT_SYMBOL(md_integrity_add_rdev);
2496 static bool rdev_read_only(struct md_rdev *rdev)
2498 return bdev_read_only(rdev->bdev) ||
2499 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2502 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2504 char b[BDEVNAME_SIZE];
2507 /* prevent duplicates */
2508 if (find_rdev(mddev, rdev->bdev->bd_dev))
2511 if (rdev_read_only(rdev) && mddev->pers)
2514 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2515 if (!test_bit(Journal, &rdev->flags) &&
2517 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2519 /* Cannot change size, so fail
2520 * If mddev->level <= 0, then we don't care
2521 * about aligning sizes (e.g. linear)
2523 if (mddev->level > 0)
2526 mddev->dev_sectors = rdev->sectors;
2529 /* Verify rdev->desc_nr is unique.
2530 * If it is -1, assign a free number, else
2531 * check number is not in use
2534 if (rdev->desc_nr < 0) {
2537 choice = mddev->raid_disks;
2538 while (md_find_rdev_nr_rcu(mddev, choice))
2540 rdev->desc_nr = choice;
2542 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2548 if (!test_bit(Journal, &rdev->flags) &&
2549 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2550 pr_warn("md: %s: array is limited to %d devices\n",
2551 mdname(mddev), mddev->max_disks);
2554 snprintf(b, sizeof(b), "%pg", rdev->bdev);
2555 strreplace(b, '/', '!');
2557 rdev->mddev = mddev;
2558 pr_debug("md: bind<%s>\n", b);
2560 if (mddev->raid_disks)
2561 mddev_create_serial_pool(mddev, rdev);
2563 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2566 /* failure here is OK */
2567 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2568 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2569 rdev->sysfs_unack_badblocks =
2570 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2571 rdev->sysfs_badblocks =
2572 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2574 list_add_rcu(&rdev->same_set, &mddev->disks);
2575 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2577 /* May as well allow recovery to be retried once */
2578 mddev->recovery_disabled++;
2583 pr_warn("md: failed to register dev-%s for %s\n",
2588 void md_autodetect_dev(dev_t dev);
2590 /* just for claiming the bdev */
2591 static struct md_rdev claim_rdev;
2593 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
2595 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2596 md_rdev_clear(rdev);
2598 if (test_bit(AutoDetected, &rdev->flags))
2599 md_autodetect_dev(rdev->bdev->bd_dev);
2601 bdev_release(rdev->bdev_handle);
2603 kobject_put(&rdev->kobj);
2606 static void md_kick_rdev_from_array(struct md_rdev *rdev)
2608 struct mddev *mddev = rdev->mddev;
2610 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2611 list_del_rcu(&rdev->same_set);
2612 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2613 mddev_destroy_serial_pool(rdev->mddev, rdev);
2615 sysfs_remove_link(&rdev->kobj, "block");
2616 sysfs_put(rdev->sysfs_state);
2617 sysfs_put(rdev->sysfs_unack_badblocks);
2618 sysfs_put(rdev->sysfs_badblocks);
2619 rdev->sysfs_state = NULL;
2620 rdev->sysfs_unack_badblocks = NULL;
2621 rdev->sysfs_badblocks = NULL;
2622 rdev->badblocks.count = 0;
2627 * kobject_del() will wait for all in progress writers to be done, where
2628 * reconfig_mutex is held, hence it can't be called under
2629 * reconfig_mutex and it's delayed to mddev_unlock().
2631 list_add(&rdev->same_set, &mddev->deleting);
2634 static void export_array(struct mddev *mddev)
2636 struct md_rdev *rdev;
2638 while (!list_empty(&mddev->disks)) {
2639 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2641 md_kick_rdev_from_array(rdev);
2643 mddev->raid_disks = 0;
2644 mddev->major_version = 0;
2647 static bool set_in_sync(struct mddev *mddev)
2649 lockdep_assert_held(&mddev->lock);
2650 if (!mddev->in_sync) {
2651 mddev->sync_checkers++;
2652 spin_unlock(&mddev->lock);
2653 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2654 spin_lock(&mddev->lock);
2655 if (!mddev->in_sync &&
2656 percpu_ref_is_zero(&mddev->writes_pending)) {
2659 * Ensure ->in_sync is visible before we clear
2663 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2664 sysfs_notify_dirent_safe(mddev->sysfs_state);
2666 if (--mddev->sync_checkers == 0)
2667 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2669 if (mddev->safemode == 1)
2670 mddev->safemode = 0;
2671 return mddev->in_sync;
2674 static void sync_sbs(struct mddev *mddev, int nospares)
2676 /* Update each superblock (in-memory image), but
2677 * if we are allowed to, skip spares which already
2678 * have the right event counter, or have one earlier
2679 * (which would mean they aren't being marked as dirty
2680 * with the rest of the array)
2682 struct md_rdev *rdev;
2683 rdev_for_each(rdev, mddev) {
2684 if (rdev->sb_events == mddev->events ||
2686 rdev->raid_disk < 0 &&
2687 rdev->sb_events+1 == mddev->events)) {
2688 /* Don't update this superblock */
2689 rdev->sb_loaded = 2;
2691 sync_super(mddev, rdev);
2692 rdev->sb_loaded = 1;
2697 static bool does_sb_need_changing(struct mddev *mddev)
2699 struct md_rdev *rdev = NULL, *iter;
2700 struct mdp_superblock_1 *sb;
2703 /* Find a good rdev */
2704 rdev_for_each(iter, mddev)
2705 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2710 /* No good device found. */
2714 sb = page_address(rdev->sb_page);
2715 /* Check if a device has become faulty or a spare become active */
2716 rdev_for_each(rdev, mddev) {
2717 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2718 /* Device activated? */
2719 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2720 !test_bit(Faulty, &rdev->flags))
2722 /* Device turned faulty? */
2723 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2727 /* Check if any mddev parameters have changed */
2728 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2729 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2730 (mddev->layout != le32_to_cpu(sb->layout)) ||
2731 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2732 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2738 void md_update_sb(struct mddev *mddev, int force_change)
2740 struct md_rdev *rdev;
2743 int any_badblocks_changed = 0;
2746 if (!md_is_rdwr(mddev)) {
2748 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2753 if (mddev_is_clustered(mddev)) {
2754 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2756 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2758 ret = md_cluster_ops->metadata_update_start(mddev);
2759 /* Has someone else has updated the sb */
2760 if (!does_sb_need_changing(mddev)) {
2762 md_cluster_ops->metadata_update_cancel(mddev);
2763 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2764 BIT(MD_SB_CHANGE_DEVS) |
2765 BIT(MD_SB_CHANGE_CLEAN));
2771 * First make sure individual recovery_offsets are correct
2772 * curr_resync_completed can only be used during recovery.
2773 * During reshape/resync it might use array-addresses rather
2774 * that device addresses.
2776 rdev_for_each(rdev, mddev) {
2777 if (rdev->raid_disk >= 0 &&
2778 mddev->delta_disks >= 0 &&
2779 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2780 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2781 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2782 !test_bit(Journal, &rdev->flags) &&
2783 !test_bit(In_sync, &rdev->flags) &&
2784 mddev->curr_resync_completed > rdev->recovery_offset)
2785 rdev->recovery_offset = mddev->curr_resync_completed;
2788 if (!mddev->persistent) {
2789 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2790 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2791 if (!mddev->external) {
2792 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2793 rdev_for_each(rdev, mddev) {
2794 if (rdev->badblocks.changed) {
2795 rdev->badblocks.changed = 0;
2796 ack_all_badblocks(&rdev->badblocks);
2797 md_error(mddev, rdev);
2799 clear_bit(Blocked, &rdev->flags);
2800 clear_bit(BlockedBadBlocks, &rdev->flags);
2801 wake_up(&rdev->blocked_wait);
2804 wake_up(&mddev->sb_wait);
2808 spin_lock(&mddev->lock);
2810 mddev->utime = ktime_get_real_seconds();
2812 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2814 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2815 /* just a clean<-> dirty transition, possibly leave spares alone,
2816 * though if events isn't the right even/odd, we will have to do
2822 if (mddev->degraded)
2823 /* If the array is degraded, then skipping spares is both
2824 * dangerous and fairly pointless.
2825 * Dangerous because a device that was removed from the array
2826 * might have a event_count that still looks up-to-date,
2827 * so it can be re-added without a resync.
2828 * Pointless because if there are any spares to skip,
2829 * then a recovery will happen and soon that array won't
2830 * be degraded any more and the spare can go back to sleep then.
2834 sync_req = mddev->in_sync;
2836 /* If this is just a dirty<->clean transition, and the array is clean
2837 * and 'events' is odd, we can roll back to the previous clean state */
2839 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2840 && mddev->can_decrease_events
2841 && mddev->events != 1) {
2843 mddev->can_decrease_events = 0;
2845 /* otherwise we have to go forward and ... */
2847 mddev->can_decrease_events = nospares;
2851 * This 64-bit counter should never wrap.
2852 * Either we are in around ~1 trillion A.C., assuming
2853 * 1 reboot per second, or we have a bug...
2855 WARN_ON(mddev->events == 0);
2857 rdev_for_each(rdev, mddev) {
2858 if (rdev->badblocks.changed)
2859 any_badblocks_changed++;
2860 if (test_bit(Faulty, &rdev->flags))
2861 set_bit(FaultRecorded, &rdev->flags);
2864 sync_sbs(mddev, nospares);
2865 spin_unlock(&mddev->lock);
2867 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2868 mdname(mddev), mddev->in_sync);
2871 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2873 md_bitmap_update_sb(mddev->bitmap);
2874 rdev_for_each(rdev, mddev) {
2875 if (rdev->sb_loaded != 1)
2876 continue; /* no noise on spare devices */
2878 if (!test_bit(Faulty, &rdev->flags)) {
2879 md_super_write(mddev,rdev,
2880 rdev->sb_start, rdev->sb_size,
2882 pr_debug("md: (write) %pg's sb offset: %llu\n",
2884 (unsigned long long)rdev->sb_start);
2885 rdev->sb_events = mddev->events;
2886 if (rdev->badblocks.size) {
2887 md_super_write(mddev, rdev,
2888 rdev->badblocks.sector,
2889 rdev->badblocks.size << 9,
2891 rdev->badblocks.size = 0;
2895 pr_debug("md: %pg (skipping faulty)\n",
2898 if (mddev->level == LEVEL_MULTIPATH)
2899 /* only need to write one superblock... */
2902 if (md_super_wait(mddev) < 0)
2904 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2906 if (mddev_is_clustered(mddev) && ret == 0)
2907 md_cluster_ops->metadata_update_finish(mddev);
2909 if (mddev->in_sync != sync_req ||
2910 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2911 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2912 /* have to write it out again */
2914 wake_up(&mddev->sb_wait);
2915 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2916 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2918 rdev_for_each(rdev, mddev) {
2919 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2920 clear_bit(Blocked, &rdev->flags);
2922 if (any_badblocks_changed)
2923 ack_all_badblocks(&rdev->badblocks);
2924 clear_bit(BlockedBadBlocks, &rdev->flags);
2925 wake_up(&rdev->blocked_wait);
2928 EXPORT_SYMBOL(md_update_sb);
2930 static int add_bound_rdev(struct md_rdev *rdev)
2932 struct mddev *mddev = rdev->mddev;
2934 bool add_journal = test_bit(Journal, &rdev->flags);
2936 if (!mddev->pers->hot_remove_disk || add_journal) {
2937 /* If there is hot_add_disk but no hot_remove_disk
2938 * then added disks for geometry changes,
2939 * and should be added immediately.
2941 super_types[mddev->major_version].
2942 validate_super(mddev, NULL/*freshest*/, rdev);
2943 err = mddev->pers->hot_add_disk(mddev, rdev);
2945 md_kick_rdev_from_array(rdev);
2949 sysfs_notify_dirent_safe(rdev->sysfs_state);
2951 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2952 if (mddev->degraded)
2953 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2954 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2956 md_wakeup_thread(mddev->thread);
2960 /* words written to sysfs files may, or may not, be \n terminated.
2961 * We want to accept with case. For this we use cmd_match.
2963 static int cmd_match(const char *cmd, const char *str)
2965 /* See if cmd, written into a sysfs file, matches
2966 * str. They must either be the same, or cmd can
2967 * have a trailing newline
2969 while (*cmd && *str && *cmd == *str) {
2980 struct rdev_sysfs_entry {
2981 struct attribute attr;
2982 ssize_t (*show)(struct md_rdev *, char *);
2983 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2987 state_show(struct md_rdev *rdev, char *page)
2991 unsigned long flags = READ_ONCE(rdev->flags);
2993 if (test_bit(Faulty, &flags) ||
2994 (!test_bit(ExternalBbl, &flags) &&
2995 rdev->badblocks.unacked_exist))
2996 len += sprintf(page+len, "faulty%s", sep);
2997 if (test_bit(In_sync, &flags))
2998 len += sprintf(page+len, "in_sync%s", sep);
2999 if (test_bit(Journal, &flags))
3000 len += sprintf(page+len, "journal%s", sep);
3001 if (test_bit(WriteMostly, &flags))
3002 len += sprintf(page+len, "write_mostly%s", sep);
3003 if (test_bit(Blocked, &flags) ||
3004 (rdev->badblocks.unacked_exist
3005 && !test_bit(Faulty, &flags)))
3006 len += sprintf(page+len, "blocked%s", sep);
3007 if (!test_bit(Faulty, &flags) &&
3008 !test_bit(Journal, &flags) &&
3009 !test_bit(In_sync, &flags))
3010 len += sprintf(page+len, "spare%s", sep);
3011 if (test_bit(WriteErrorSeen, &flags))
3012 len += sprintf(page+len, "write_error%s", sep);
3013 if (test_bit(WantReplacement, &flags))
3014 len += sprintf(page+len, "want_replacement%s", sep);
3015 if (test_bit(Replacement, &flags))
3016 len += sprintf(page+len, "replacement%s", sep);
3017 if (test_bit(ExternalBbl, &flags))
3018 len += sprintf(page+len, "external_bbl%s", sep);
3019 if (test_bit(FailFast, &flags))
3020 len += sprintf(page+len, "failfast%s", sep);
3025 return len+sprintf(page+len, "\n");
3029 state_store(struct md_rdev *rdev, const char *buf, size_t len)
3032 * faulty - simulates an error
3033 * remove - disconnects the device
3034 * writemostly - sets write_mostly
3035 * -writemostly - clears write_mostly
3036 * blocked - sets the Blocked flags
3037 * -blocked - clears the Blocked and possibly simulates an error
3038 * insync - sets Insync providing device isn't active
3039 * -insync - clear Insync for a device with a slot assigned,
3040 * so that it gets rebuilt based on bitmap
3041 * write_error - sets WriteErrorSeen
3042 * -write_error - clears WriteErrorSeen
3043 * {,-}failfast - set/clear FailFast
3046 struct mddev *mddev = rdev->mddev;
3048 bool need_update_sb = false;
3050 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
3051 md_error(rdev->mddev, rdev);
3053 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
3057 } else if (cmd_match(buf, "remove")) {
3058 if (rdev->mddev->pers) {
3059 clear_bit(Blocked, &rdev->flags);
3060 remove_and_add_spares(rdev->mddev, rdev);
3062 if (rdev->raid_disk >= 0)
3066 if (mddev_is_clustered(mddev))
3067 err = md_cluster_ops->remove_disk(mddev, rdev);
3070 md_kick_rdev_from_array(rdev);
3072 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3073 md_wakeup_thread(mddev->thread);
3078 } else if (cmd_match(buf, "writemostly")) {
3079 set_bit(WriteMostly, &rdev->flags);
3080 mddev_create_serial_pool(rdev->mddev, rdev);
3081 need_update_sb = true;
3083 } else if (cmd_match(buf, "-writemostly")) {
3084 mddev_destroy_serial_pool(rdev->mddev, rdev);
3085 clear_bit(WriteMostly, &rdev->flags);
3086 need_update_sb = true;
3088 } else if (cmd_match(buf, "blocked")) {
3089 set_bit(Blocked, &rdev->flags);
3091 } else if (cmd_match(buf, "-blocked")) {
3092 if (!test_bit(Faulty, &rdev->flags) &&
3093 !test_bit(ExternalBbl, &rdev->flags) &&
3094 rdev->badblocks.unacked_exist) {
3095 /* metadata handler doesn't understand badblocks,
3096 * so we need to fail the device
3098 md_error(rdev->mddev, rdev);
3100 clear_bit(Blocked, &rdev->flags);
3101 clear_bit(BlockedBadBlocks, &rdev->flags);
3102 wake_up(&rdev->blocked_wait);
3103 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3104 md_wakeup_thread(rdev->mddev->thread);
3107 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3108 set_bit(In_sync, &rdev->flags);
3110 } else if (cmd_match(buf, "failfast")) {
3111 set_bit(FailFast, &rdev->flags);
3112 need_update_sb = true;
3114 } else if (cmd_match(buf, "-failfast")) {
3115 clear_bit(FailFast, &rdev->flags);
3116 need_update_sb = true;
3118 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3119 !test_bit(Journal, &rdev->flags)) {
3120 if (rdev->mddev->pers == NULL) {
3121 clear_bit(In_sync, &rdev->flags);
3122 rdev->saved_raid_disk = rdev->raid_disk;
3123 rdev->raid_disk = -1;
3126 } else if (cmd_match(buf, "write_error")) {
3127 set_bit(WriteErrorSeen, &rdev->flags);
3129 } else if (cmd_match(buf, "-write_error")) {
3130 clear_bit(WriteErrorSeen, &rdev->flags);
3132 } else if (cmd_match(buf, "want_replacement")) {
3133 /* Any non-spare device that is not a replacement can
3134 * become want_replacement at any time, but we then need to
3135 * check if recovery is needed.
3137 if (rdev->raid_disk >= 0 &&
3138 !test_bit(Journal, &rdev->flags) &&
3139 !test_bit(Replacement, &rdev->flags))
3140 set_bit(WantReplacement, &rdev->flags);
3141 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3142 md_wakeup_thread(rdev->mddev->thread);
3144 } else if (cmd_match(buf, "-want_replacement")) {
3145 /* Clearing 'want_replacement' is always allowed.
3146 * Once replacements starts it is too late though.
3149 clear_bit(WantReplacement, &rdev->flags);
3150 } else if (cmd_match(buf, "replacement")) {
3151 /* Can only set a device as a replacement when array has not
3152 * yet been started. Once running, replacement is automatic
3153 * from spares, or by assigning 'slot'.
3155 if (rdev->mddev->pers)
3158 set_bit(Replacement, &rdev->flags);
3161 } else if (cmd_match(buf, "-replacement")) {
3162 /* Similarly, can only clear Replacement before start */
3163 if (rdev->mddev->pers)
3166 clear_bit(Replacement, &rdev->flags);
3169 } else if (cmd_match(buf, "re-add")) {
3170 if (!rdev->mddev->pers)
3172 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3173 rdev->saved_raid_disk >= 0) {
3174 /* clear_bit is performed _after_ all the devices
3175 * have their local Faulty bit cleared. If any writes
3176 * happen in the meantime in the local node, they
3177 * will land in the local bitmap, which will be synced
3178 * by this node eventually
3180 if (!mddev_is_clustered(rdev->mddev) ||
3181 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3182 clear_bit(Faulty, &rdev->flags);
3183 err = add_bound_rdev(rdev);
3187 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3188 set_bit(ExternalBbl, &rdev->flags);
3189 rdev->badblocks.shift = 0;
3191 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3192 clear_bit(ExternalBbl, &rdev->flags);
3196 md_update_sb(mddev, 1);
3198 sysfs_notify_dirent_safe(rdev->sysfs_state);
3199 return err ? err : len;
3201 static struct rdev_sysfs_entry rdev_state =
3202 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3205 errors_show(struct md_rdev *rdev, char *page)
3207 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3211 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3216 rv = kstrtouint(buf, 10, &n);
3219 atomic_set(&rdev->corrected_errors, n);
3222 static struct rdev_sysfs_entry rdev_errors =
3223 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3226 slot_show(struct md_rdev *rdev, char *page)
3228 if (test_bit(Journal, &rdev->flags))
3229 return sprintf(page, "journal\n");
3230 else if (rdev->raid_disk < 0)
3231 return sprintf(page, "none\n");
3233 return sprintf(page, "%d\n", rdev->raid_disk);
3237 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3242 if (test_bit(Journal, &rdev->flags))
3244 if (strncmp(buf, "none", 4)==0)
3247 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3254 if (rdev->mddev->pers && slot == -1) {
3255 /* Setting 'slot' on an active array requires also
3256 * updating the 'rd%d' link, and communicating
3257 * with the personality with ->hot_*_disk.
3258 * For now we only support removing
3259 * failed/spare devices. This normally happens automatically,
3260 * but not when the metadata is externally managed.
3262 if (rdev->raid_disk == -1)
3264 /* personality does all needed checks */
3265 if (rdev->mddev->pers->hot_remove_disk == NULL)
3267 clear_bit(Blocked, &rdev->flags);
3268 remove_and_add_spares(rdev->mddev, rdev);
3269 if (rdev->raid_disk >= 0)
3271 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3272 md_wakeup_thread(rdev->mddev->thread);
3273 } else if (rdev->mddev->pers) {
3274 /* Activating a spare .. or possibly reactivating
3275 * if we ever get bitmaps working here.
3279 if (rdev->raid_disk != -1)
3282 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3285 if (rdev->mddev->pers->hot_add_disk == NULL)
3288 if (slot >= rdev->mddev->raid_disks &&
3289 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3292 rdev->raid_disk = slot;
3293 if (test_bit(In_sync, &rdev->flags))
3294 rdev->saved_raid_disk = slot;
3296 rdev->saved_raid_disk = -1;
3297 clear_bit(In_sync, &rdev->flags);
3298 clear_bit(Bitmap_sync, &rdev->flags);
3299 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3301 rdev->raid_disk = -1;
3304 sysfs_notify_dirent_safe(rdev->sysfs_state);
3305 /* failure here is OK */;
3306 sysfs_link_rdev(rdev->mddev, rdev);
3307 /* don't wakeup anyone, leave that to userspace. */
3309 if (slot >= rdev->mddev->raid_disks &&
3310 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3312 rdev->raid_disk = slot;
3313 /* assume it is working */
3314 clear_bit(Faulty, &rdev->flags);
3315 clear_bit(WriteMostly, &rdev->flags);
3316 set_bit(In_sync, &rdev->flags);
3317 sysfs_notify_dirent_safe(rdev->sysfs_state);
3322 static struct rdev_sysfs_entry rdev_slot =
3323 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3326 offset_show(struct md_rdev *rdev, char *page)
3328 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3332 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3334 unsigned long long offset;
3335 if (kstrtoull(buf, 10, &offset) < 0)
3337 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3339 if (rdev->sectors && rdev->mddev->external)
3340 /* Must set offset before size, so overlap checks
3343 rdev->data_offset = offset;
3344 rdev->new_data_offset = offset;
3348 static struct rdev_sysfs_entry rdev_offset =
3349 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3351 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3353 return sprintf(page, "%llu\n",
3354 (unsigned long long)rdev->new_data_offset);
3357 static ssize_t new_offset_store(struct md_rdev *rdev,
3358 const char *buf, size_t len)
3360 unsigned long long new_offset;
3361 struct mddev *mddev = rdev->mddev;
3363 if (kstrtoull(buf, 10, &new_offset) < 0)
3366 if (mddev->sync_thread ||
3367 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3369 if (new_offset == rdev->data_offset)
3370 /* reset is always permitted */
3372 else if (new_offset > rdev->data_offset) {
3373 /* must not push array size beyond rdev_sectors */
3374 if (new_offset - rdev->data_offset
3375 + mddev->dev_sectors > rdev->sectors)
3378 /* Metadata worries about other space details. */
3380 /* decreasing the offset is inconsistent with a backwards
3383 if (new_offset < rdev->data_offset &&
3384 mddev->reshape_backwards)
3386 /* Increasing offset is inconsistent with forwards
3387 * reshape. reshape_direction should be set to
3388 * 'backwards' first.
3390 if (new_offset > rdev->data_offset &&
3391 !mddev->reshape_backwards)
3394 if (mddev->pers && mddev->persistent &&
3395 !super_types[mddev->major_version]
3396 .allow_new_offset(rdev, new_offset))
3398 rdev->new_data_offset = new_offset;
3399 if (new_offset > rdev->data_offset)
3400 mddev->reshape_backwards = 1;
3401 else if (new_offset < rdev->data_offset)
3402 mddev->reshape_backwards = 0;
3406 static struct rdev_sysfs_entry rdev_new_offset =
3407 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3410 rdev_size_show(struct md_rdev *rdev, char *page)
3412 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3415 static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
3417 /* check if two start/length pairs overlap */
3418 if (a->data_offset + a->sectors <= b->data_offset)
3420 if (b->data_offset + b->sectors <= a->data_offset)
3425 static bool md_rdev_overlaps(struct md_rdev *rdev)
3427 struct mddev *mddev;
3428 struct md_rdev *rdev2;
3430 spin_lock(&all_mddevs_lock);
3431 list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
3432 if (test_bit(MD_DELETED, &mddev->flags))
3434 rdev_for_each(rdev2, mddev) {
3435 if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
3436 md_rdevs_overlap(rdev, rdev2)) {
3437 spin_unlock(&all_mddevs_lock);
3442 spin_unlock(&all_mddevs_lock);
3446 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3448 unsigned long long blocks;
3451 if (kstrtoull(buf, 10, &blocks) < 0)
3454 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3455 return -EINVAL; /* sector conversion overflow */
3458 if (new != blocks * 2)
3459 return -EINVAL; /* unsigned long long to sector_t overflow */
3466 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3468 struct mddev *my_mddev = rdev->mddev;
3469 sector_t oldsectors = rdev->sectors;
3472 if (test_bit(Journal, &rdev->flags))
3474 if (strict_blocks_to_sectors(buf, §ors) < 0)
3476 if (rdev->data_offset != rdev->new_data_offset)
3477 return -EINVAL; /* too confusing */
3478 if (my_mddev->pers && rdev->raid_disk >= 0) {
3479 if (my_mddev->persistent) {
3480 sectors = super_types[my_mddev->major_version].
3481 rdev_size_change(rdev, sectors);
3484 } else if (!sectors)
3485 sectors = bdev_nr_sectors(rdev->bdev) -
3487 if (!my_mddev->pers->resize)
3488 /* Cannot change size for RAID0 or Linear etc */
3491 if (sectors < my_mddev->dev_sectors)
3492 return -EINVAL; /* component must fit device */
3494 rdev->sectors = sectors;
3497 * Check that all other rdevs with the same bdev do not overlap. This
3498 * check does not provide a hard guarantee, it just helps avoid
3499 * dangerous mistakes.
3501 if (sectors > oldsectors && my_mddev->external &&
3502 md_rdev_overlaps(rdev)) {
3504 * Someone else could have slipped in a size change here, but
3505 * doing so is just silly. We put oldsectors back because we
3506 * know it is safe, and trust userspace not to race with itself.
3508 rdev->sectors = oldsectors;
3514 static struct rdev_sysfs_entry rdev_size =
3515 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3517 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3519 unsigned long long recovery_start = rdev->recovery_offset;
3521 if (test_bit(In_sync, &rdev->flags) ||
3522 recovery_start == MaxSector)
3523 return sprintf(page, "none\n");
3525 return sprintf(page, "%llu\n", recovery_start);
3528 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3530 unsigned long long recovery_start;
3532 if (cmd_match(buf, "none"))
3533 recovery_start = MaxSector;
3534 else if (kstrtoull(buf, 10, &recovery_start))
3537 if (rdev->mddev->pers &&
3538 rdev->raid_disk >= 0)
3541 rdev->recovery_offset = recovery_start;
3542 if (recovery_start == MaxSector)
3543 set_bit(In_sync, &rdev->flags);
3545 clear_bit(In_sync, &rdev->flags);
3549 static struct rdev_sysfs_entry rdev_recovery_start =
3550 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3552 /* sysfs access to bad-blocks list.
3553 * We present two files.
3554 * 'bad-blocks' lists sector numbers and lengths of ranges that
3555 * are recorded as bad. The list is truncated to fit within
3556 * the one-page limit of sysfs.
3557 * Writing "sector length" to this file adds an acknowledged
3559 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3560 * been acknowledged. Writing to this file adds bad blocks
3561 * without acknowledging them. This is largely for testing.
3563 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3565 return badblocks_show(&rdev->badblocks, page, 0);
3567 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3569 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3570 /* Maybe that ack was all we needed */
3571 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3572 wake_up(&rdev->blocked_wait);
3575 static struct rdev_sysfs_entry rdev_bad_blocks =
3576 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3578 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3580 return badblocks_show(&rdev->badblocks, page, 1);
3582 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3584 return badblocks_store(&rdev->badblocks, page, len, 1);
3586 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3587 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3590 ppl_sector_show(struct md_rdev *rdev, char *page)
3592 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3596 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3598 unsigned long long sector;
3600 if (kstrtoull(buf, 10, §or) < 0)
3602 if (sector != (sector_t)sector)
3605 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3606 rdev->raid_disk >= 0)
3609 if (rdev->mddev->persistent) {
3610 if (rdev->mddev->major_version == 0)
3612 if ((sector > rdev->sb_start &&
3613 sector - rdev->sb_start > S16_MAX) ||
3614 (sector < rdev->sb_start &&
3615 rdev->sb_start - sector > -S16_MIN))
3617 rdev->ppl.offset = sector - rdev->sb_start;
3618 } else if (!rdev->mddev->external) {
3621 rdev->ppl.sector = sector;
3625 static struct rdev_sysfs_entry rdev_ppl_sector =
3626 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3629 ppl_size_show(struct md_rdev *rdev, char *page)
3631 return sprintf(page, "%u\n", rdev->ppl.size);
3635 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3639 if (kstrtouint(buf, 10, &size) < 0)
3642 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3643 rdev->raid_disk >= 0)
3646 if (rdev->mddev->persistent) {
3647 if (rdev->mddev->major_version == 0)
3651 } else if (!rdev->mddev->external) {
3654 rdev->ppl.size = size;
3658 static struct rdev_sysfs_entry rdev_ppl_size =
3659 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3661 static struct attribute *rdev_default_attrs[] = {
3666 &rdev_new_offset.attr,
3668 &rdev_recovery_start.attr,
3669 &rdev_bad_blocks.attr,
3670 &rdev_unack_bad_blocks.attr,
3671 &rdev_ppl_sector.attr,
3672 &rdev_ppl_size.attr,
3675 ATTRIBUTE_GROUPS(rdev_default);
3677 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3679 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3680 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3686 return entry->show(rdev, page);
3690 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3691 const char *page, size_t length)
3693 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3694 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3695 struct kernfs_node *kn = NULL;
3696 bool suspend = false;
3698 struct mddev *mddev = rdev->mddev;
3702 if (!capable(CAP_SYS_ADMIN))
3707 if (entry->store == state_store) {
3708 if (cmd_match(page, "remove"))
3709 kn = sysfs_break_active_protection(kobj, attr);
3710 if (cmd_match(page, "remove") || cmd_match(page, "re-add") ||
3711 cmd_match(page, "writemostly") ||
3712 cmd_match(page, "-writemostly"))
3716 rv = suspend ? mddev_suspend_and_lock(mddev) : mddev_lock(mddev);
3718 if (rdev->mddev == NULL)
3721 rv = entry->store(rdev, page, length);
3722 suspend ? mddev_unlock_and_resume(mddev) : mddev_unlock(mddev);
3726 sysfs_unbreak_active_protection(kn);
3731 static void rdev_free(struct kobject *ko)
3733 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3736 static const struct sysfs_ops rdev_sysfs_ops = {
3737 .show = rdev_attr_show,
3738 .store = rdev_attr_store,
3740 static const struct kobj_type rdev_ktype = {
3741 .release = rdev_free,
3742 .sysfs_ops = &rdev_sysfs_ops,
3743 .default_groups = rdev_default_groups,
3746 int md_rdev_init(struct md_rdev *rdev)
3749 rdev->saved_raid_disk = -1;
3750 rdev->raid_disk = -1;
3752 rdev->data_offset = 0;
3753 rdev->new_data_offset = 0;
3754 rdev->sb_events = 0;
3755 rdev->last_read_error = 0;
3756 rdev->sb_loaded = 0;
3757 rdev->bb_page = NULL;
3758 atomic_set(&rdev->nr_pending, 0);
3759 atomic_set(&rdev->read_errors, 0);
3760 atomic_set(&rdev->corrected_errors, 0);
3762 INIT_LIST_HEAD(&rdev->same_set);
3763 init_waitqueue_head(&rdev->blocked_wait);
3765 /* Add space to store bad block list.
3766 * This reserves the space even on arrays where it cannot
3767 * be used - I wonder if that matters
3769 return badblocks_init(&rdev->badblocks, 0);
3771 EXPORT_SYMBOL_GPL(md_rdev_init);
3774 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3776 * mark the device faulty if:
3778 * - the device is nonexistent (zero size)
3779 * - the device has no valid superblock
3781 * a faulty rdev _never_ has rdev->sb set.
3783 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3785 struct md_rdev *rdev;
3789 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3791 return ERR_PTR(-ENOMEM);
3793 err = md_rdev_init(rdev);
3796 err = alloc_disk_sb(rdev);
3798 goto out_clear_rdev;
3800 rdev->bdev_handle = bdev_open_by_dev(newdev,
3801 BLK_OPEN_READ | BLK_OPEN_WRITE,
3802 super_format == -2 ? &claim_rdev : rdev, NULL);
3803 if (IS_ERR(rdev->bdev_handle)) {
3804 pr_warn("md: could not open device unknown-block(%u,%u).\n",
3805 MAJOR(newdev), MINOR(newdev));
3806 err = PTR_ERR(rdev->bdev_handle);
3807 goto out_clear_rdev;
3809 rdev->bdev = rdev->bdev_handle->bdev;
3811 kobject_init(&rdev->kobj, &rdev_ktype);
3813 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3815 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3818 goto out_blkdev_put;
3821 if (super_format >= 0) {
3822 err = super_types[super_format].
3823 load_super(rdev, NULL, super_minor);
3824 if (err == -EINVAL) {
3825 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3827 super_format, super_minor);
3828 goto out_blkdev_put;
3831 pr_warn("md: could not read %pg's sb, not importing!\n",
3833 goto out_blkdev_put;
3840 bdev_release(rdev->bdev_handle);
3842 md_rdev_clear(rdev);
3845 return ERR_PTR(err);
3849 * Check a full RAID array for plausibility
3852 static int analyze_sbs(struct mddev *mddev)
3855 struct md_rdev *rdev, *freshest, *tmp;
3858 rdev_for_each_safe(rdev, tmp, mddev)
3859 switch (super_types[mddev->major_version].
3860 load_super(rdev, freshest, mddev->minor_version)) {
3867 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3869 md_kick_rdev_from_array(rdev);
3872 /* Cannot find a valid fresh disk */
3874 pr_warn("md: cannot find a valid disk\n");
3878 super_types[mddev->major_version].
3879 validate_super(mddev, NULL/*freshest*/, freshest);
3882 rdev_for_each_safe(rdev, tmp, mddev) {
3883 if (mddev->max_disks &&
3884 (rdev->desc_nr >= mddev->max_disks ||
3885 i > mddev->max_disks)) {
3886 pr_warn("md: %s: %pg: only %d devices permitted\n",
3887 mdname(mddev), rdev->bdev,
3889 md_kick_rdev_from_array(rdev);
3892 if (rdev != freshest) {
3893 if (super_types[mddev->major_version].
3894 validate_super(mddev, freshest, rdev)) {
3895 pr_warn("md: kicking non-fresh %pg from array!\n",
3897 md_kick_rdev_from_array(rdev);
3901 if (mddev->level == LEVEL_MULTIPATH) {
3902 rdev->desc_nr = i++;
3903 rdev->raid_disk = rdev->desc_nr;
3904 set_bit(In_sync, &rdev->flags);
3905 } else if (rdev->raid_disk >=
3906 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3907 !test_bit(Journal, &rdev->flags)) {
3908 rdev->raid_disk = -1;
3909 clear_bit(In_sync, &rdev->flags);
3916 /* Read a fixed-point number.
3917 * Numbers in sysfs attributes should be in "standard" units where
3918 * possible, so time should be in seconds.
3919 * However we internally use a a much smaller unit such as
3920 * milliseconds or jiffies.
3921 * This function takes a decimal number with a possible fractional
3922 * component, and produces an integer which is the result of
3923 * multiplying that number by 10^'scale'.
3924 * all without any floating-point arithmetic.
3926 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3928 unsigned long result = 0;
3930 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3933 else if (decimals < scale) {
3936 result = result * 10 + value;
3948 *res = result * int_pow(10, scale - decimals);
3953 safe_delay_show(struct mddev *mddev, char *page)
3955 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3957 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3960 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3964 if (mddev_is_clustered(mddev)) {
3965 pr_warn("md: Safemode is disabled for clustered mode\n");
3969 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3972 mddev->safemode_delay = 0;
3974 unsigned long old_delay = mddev->safemode_delay;
3975 unsigned long new_delay = (msec*HZ)/1000;
3979 mddev->safemode_delay = new_delay;
3980 if (new_delay < old_delay || old_delay == 0)
3981 mod_timer(&mddev->safemode_timer, jiffies+1);
3985 static struct md_sysfs_entry md_safe_delay =
3986 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3989 level_show(struct mddev *mddev, char *page)
3991 struct md_personality *p;
3993 spin_lock(&mddev->lock);
3996 ret = sprintf(page, "%s\n", p->name);
3997 else if (mddev->clevel[0])
3998 ret = sprintf(page, "%s\n", mddev->clevel);
3999 else if (mddev->level != LEVEL_NONE)
4000 ret = sprintf(page, "%d\n", mddev->level);
4003 spin_unlock(&mddev->lock);
4008 level_store(struct mddev *mddev, const char *buf, size_t len)
4013 struct md_personality *pers, *oldpers;
4015 void *priv, *oldpriv;
4016 struct md_rdev *rdev;
4018 if (slen == 0 || slen >= sizeof(clevel))
4021 rv = mddev_suspend_and_lock(mddev);
4025 if (mddev->pers == NULL) {
4026 memcpy(mddev->clevel, buf, slen);
4027 if (mddev->clevel[slen-1] == '\n')
4029 mddev->clevel[slen] = 0;
4030 mddev->level = LEVEL_NONE;
4035 if (!md_is_rdwr(mddev))
4038 /* request to change the personality. Need to ensure:
4039 * - array is not engaged in resync/recovery/reshape
4040 * - old personality can be suspended
4041 * - new personality will access other array.
4045 if (mddev->sync_thread ||
4046 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4047 mddev->reshape_position != MaxSector ||
4048 mddev->sysfs_active)
4052 if (!mddev->pers->quiesce) {
4053 pr_warn("md: %s: %s does not support online personality change\n",
4054 mdname(mddev), mddev->pers->name);
4058 /* Now find the new personality */
4059 memcpy(clevel, buf, slen);
4060 if (clevel[slen-1] == '\n')
4063 if (kstrtol(clevel, 10, &level))
4066 if (request_module("md-%s", clevel) != 0)
4067 request_module("md-level-%s", clevel);
4068 spin_lock(&pers_lock);
4069 pers = find_pers(level, clevel);
4070 if (!pers || !try_module_get(pers->owner)) {
4071 spin_unlock(&pers_lock);
4072 pr_warn("md: personality %s not loaded\n", clevel);
4076 spin_unlock(&pers_lock);
4078 if (pers == mddev->pers) {
4079 /* Nothing to do! */
4080 module_put(pers->owner);
4084 if (!pers->takeover) {
4085 module_put(pers->owner);
4086 pr_warn("md: %s: %s does not support personality takeover\n",
4087 mdname(mddev), clevel);
4092 rdev_for_each(rdev, mddev)
4093 rdev->new_raid_disk = rdev->raid_disk;
4095 /* ->takeover must set new_* and/or delta_disks
4096 * if it succeeds, and may set them when it fails.
4098 priv = pers->takeover(mddev);
4100 mddev->new_level = mddev->level;
4101 mddev->new_layout = mddev->layout;
4102 mddev->new_chunk_sectors = mddev->chunk_sectors;
4103 mddev->raid_disks -= mddev->delta_disks;
4104 mddev->delta_disks = 0;
4105 mddev->reshape_backwards = 0;
4106 module_put(pers->owner);
4107 pr_warn("md: %s: %s would not accept array\n",
4108 mdname(mddev), clevel);
4113 /* Looks like we have a winner */
4114 mddev_detach(mddev);
4116 spin_lock(&mddev->lock);
4117 oldpers = mddev->pers;
4118 oldpriv = mddev->private;
4120 mddev->private = priv;
4121 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4122 mddev->level = mddev->new_level;
4123 mddev->layout = mddev->new_layout;
4124 mddev->chunk_sectors = mddev->new_chunk_sectors;
4125 mddev->delta_disks = 0;
4126 mddev->reshape_backwards = 0;
4127 mddev->degraded = 0;
4128 spin_unlock(&mddev->lock);
4130 if (oldpers->sync_request == NULL &&
4132 /* We are converting from a no-redundancy array
4133 * to a redundancy array and metadata is managed
4134 * externally so we need to be sure that writes
4135 * won't block due to a need to transition
4137 * until external management is started.
4140 mddev->safemode_delay = 0;
4141 mddev->safemode = 0;
4144 oldpers->free(mddev, oldpriv);
4146 if (oldpers->sync_request == NULL &&
4147 pers->sync_request != NULL) {
4148 /* need to add the md_redundancy_group */
4149 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4150 pr_warn("md: cannot register extra attributes for %s\n",
4152 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4153 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4154 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4156 if (oldpers->sync_request != NULL &&
4157 pers->sync_request == NULL) {
4158 /* need to remove the md_redundancy_group */
4159 if (mddev->to_remove == NULL)
4160 mddev->to_remove = &md_redundancy_group;
4163 module_put(oldpers->owner);
4165 rdev_for_each(rdev, mddev) {
4166 if (rdev->raid_disk < 0)
4168 if (rdev->new_raid_disk >= mddev->raid_disks)
4169 rdev->new_raid_disk = -1;
4170 if (rdev->new_raid_disk == rdev->raid_disk)
4172 sysfs_unlink_rdev(mddev, rdev);
4174 rdev_for_each(rdev, mddev) {
4175 if (rdev->raid_disk < 0)
4177 if (rdev->new_raid_disk == rdev->raid_disk)
4179 rdev->raid_disk = rdev->new_raid_disk;
4180 if (rdev->raid_disk < 0)
4181 clear_bit(In_sync, &rdev->flags);
4183 if (sysfs_link_rdev(mddev, rdev))
4184 pr_warn("md: cannot register rd%d for %s after level change\n",
4185 rdev->raid_disk, mdname(mddev));
4189 if (pers->sync_request == NULL) {
4190 /* this is now an array without redundancy, so
4191 * it must always be in_sync
4194 del_timer_sync(&mddev->safemode_timer);
4196 blk_set_stacking_limits(&mddev->queue->limits);
4198 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4200 md_update_sb(mddev, 1);
4201 sysfs_notify_dirent_safe(mddev->sysfs_level);
4205 mddev_unlock_and_resume(mddev);
4209 static struct md_sysfs_entry md_level =
4210 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4213 layout_show(struct mddev *mddev, char *page)
4215 /* just a number, not meaningful for all levels */
4216 if (mddev->reshape_position != MaxSector &&
4217 mddev->layout != mddev->new_layout)
4218 return sprintf(page, "%d (%d)\n",
4219 mddev->new_layout, mddev->layout);
4220 return sprintf(page, "%d\n", mddev->layout);
4224 layout_store(struct mddev *mddev, const char *buf, size_t len)
4229 err = kstrtouint(buf, 10, &n);
4232 err = mddev_lock(mddev);
4237 if (mddev->pers->check_reshape == NULL)
4239 else if (!md_is_rdwr(mddev))
4242 mddev->new_layout = n;
4243 err = mddev->pers->check_reshape(mddev);
4245 mddev->new_layout = mddev->layout;
4248 mddev->new_layout = n;
4249 if (mddev->reshape_position == MaxSector)
4252 mddev_unlock(mddev);
4255 static struct md_sysfs_entry md_layout =
4256 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4259 raid_disks_show(struct mddev *mddev, char *page)
4261 if (mddev->raid_disks == 0)
4263 if (mddev->reshape_position != MaxSector &&
4264 mddev->delta_disks != 0)
4265 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4266 mddev->raid_disks - mddev->delta_disks);
4267 return sprintf(page, "%d\n", mddev->raid_disks);
4270 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4273 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4278 err = kstrtouint(buf, 10, &n);
4282 err = mddev_lock(mddev);
4286 err = update_raid_disks(mddev, n);
4287 else if (mddev->reshape_position != MaxSector) {
4288 struct md_rdev *rdev;
4289 int olddisks = mddev->raid_disks - mddev->delta_disks;
4292 rdev_for_each(rdev, mddev) {
4294 rdev->data_offset < rdev->new_data_offset)
4297 rdev->data_offset > rdev->new_data_offset)
4301 mddev->delta_disks = n - olddisks;
4302 mddev->raid_disks = n;
4303 mddev->reshape_backwards = (mddev->delta_disks < 0);
4305 mddev->raid_disks = n;
4307 mddev_unlock(mddev);
4308 return err ? err : len;
4310 static struct md_sysfs_entry md_raid_disks =
4311 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4314 uuid_show(struct mddev *mddev, char *page)
4316 return sprintf(page, "%pU\n", mddev->uuid);
4318 static struct md_sysfs_entry md_uuid =
4319 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4322 chunk_size_show(struct mddev *mddev, char *page)
4324 if (mddev->reshape_position != MaxSector &&
4325 mddev->chunk_sectors != mddev->new_chunk_sectors)
4326 return sprintf(page, "%d (%d)\n",
4327 mddev->new_chunk_sectors << 9,
4328 mddev->chunk_sectors << 9);
4329 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4333 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4338 err = kstrtoul(buf, 10, &n);
4342 err = mddev_lock(mddev);
4346 if (mddev->pers->check_reshape == NULL)
4348 else if (!md_is_rdwr(mddev))
4351 mddev->new_chunk_sectors = n >> 9;
4352 err = mddev->pers->check_reshape(mddev);
4354 mddev->new_chunk_sectors = mddev->chunk_sectors;
4357 mddev->new_chunk_sectors = n >> 9;
4358 if (mddev->reshape_position == MaxSector)
4359 mddev->chunk_sectors = n >> 9;
4361 mddev_unlock(mddev);
4364 static struct md_sysfs_entry md_chunk_size =
4365 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4368 resync_start_show(struct mddev *mddev, char *page)
4370 if (mddev->recovery_cp == MaxSector)
4371 return sprintf(page, "none\n");
4372 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4376 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4378 unsigned long long n;
4381 if (cmd_match(buf, "none"))
4384 err = kstrtoull(buf, 10, &n);
4387 if (n != (sector_t)n)
4391 err = mddev_lock(mddev);
4394 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4398 mddev->recovery_cp = n;
4400 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4402 mddev_unlock(mddev);
4405 static struct md_sysfs_entry md_resync_start =
4406 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4407 resync_start_show, resync_start_store);
4410 * The array state can be:
4413 * No devices, no size, no level
4414 * Equivalent to STOP_ARRAY ioctl
4416 * May have some settings, but array is not active
4417 * all IO results in error
4418 * When written, doesn't tear down array, but just stops it
4419 * suspended (not supported yet)
4420 * All IO requests will block. The array can be reconfigured.
4421 * Writing this, if accepted, will block until array is quiescent
4423 * no resync can happen. no superblocks get written.
4424 * write requests fail
4426 * like readonly, but behaves like 'clean' on a write request.
4428 * clean - no pending writes, but otherwise active.
4429 * When written to inactive array, starts without resync
4430 * If a write request arrives then
4431 * if metadata is known, mark 'dirty' and switch to 'active'.
4432 * if not known, block and switch to write-pending
4433 * If written to an active array that has pending writes, then fails.
4435 * fully active: IO and resync can be happening.
4436 * When written to inactive array, starts with resync
4439 * clean, but writes are blocked waiting for 'active' to be written.
4442 * like active, but no writes have been seen for a while (100msec).
4445 * Array is failed. It's useful because mounted-arrays aren't stopped
4446 * when array is failed, so this state will at least alert the user that
4447 * something is wrong.
4449 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4450 write_pending, active_idle, broken, bad_word};
4451 static char *array_states[] = {
4452 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4453 "write-pending", "active-idle", "broken", NULL };
4455 static int match_word(const char *word, char **list)
4458 for (n=0; list[n]; n++)
4459 if (cmd_match(word, list[n]))
4465 array_state_show(struct mddev *mddev, char *page)
4467 enum array_state st = inactive;
4469 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4478 spin_lock(&mddev->lock);
4479 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4481 else if (mddev->in_sync)
4483 else if (mddev->safemode)
4487 spin_unlock(&mddev->lock);
4490 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4493 if (list_empty(&mddev->disks) &&
4494 mddev->raid_disks == 0 &&
4495 mddev->dev_sectors == 0)
4500 return sprintf(page, "%s\n", array_states[st]);
4503 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4504 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4505 static int restart_array(struct mddev *mddev);
4508 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4511 enum array_state st = match_word(buf, array_states);
4513 /* No lock dependent actions */
4515 case suspended: /* not supported yet */
4516 case write_pending: /* cannot be set */
4517 case active_idle: /* cannot be set */
4518 case broken: /* cannot be set */
4525 if (mddev->pers && (st == active || st == clean) &&
4526 mddev->ro != MD_RDONLY) {
4527 /* don't take reconfig_mutex when toggling between
4530 spin_lock(&mddev->lock);
4532 restart_array(mddev);
4533 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4534 md_wakeup_thread(mddev->thread);
4535 wake_up(&mddev->sb_wait);
4536 } else /* st == clean */ {
4537 restart_array(mddev);
4538 if (!set_in_sync(mddev))
4542 sysfs_notify_dirent_safe(mddev->sysfs_state);
4543 spin_unlock(&mddev->lock);
4546 err = mddev_lock(mddev);
4552 /* stop an active array, return 0 otherwise */
4554 err = do_md_stop(mddev, 2, NULL);
4557 err = do_md_stop(mddev, 0, NULL);
4561 err = md_set_readonly(mddev, NULL);
4563 mddev->ro = MD_RDONLY;
4564 set_disk_ro(mddev->gendisk, 1);
4565 err = do_md_run(mddev);
4570 if (md_is_rdwr(mddev))
4571 err = md_set_readonly(mddev, NULL);
4572 else if (mddev->ro == MD_RDONLY)
4573 err = restart_array(mddev);
4575 mddev->ro = MD_AUTO_READ;
4576 set_disk_ro(mddev->gendisk, 0);
4579 mddev->ro = MD_AUTO_READ;
4580 err = do_md_run(mddev);
4585 err = restart_array(mddev);
4588 spin_lock(&mddev->lock);
4589 if (!set_in_sync(mddev))
4591 spin_unlock(&mddev->lock);
4597 err = restart_array(mddev);
4600 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4601 wake_up(&mddev->sb_wait);
4604 mddev->ro = MD_RDWR;
4605 set_disk_ro(mddev->gendisk, 0);
4606 err = do_md_run(mddev);
4615 if (mddev->hold_active == UNTIL_IOCTL)
4616 mddev->hold_active = 0;
4617 sysfs_notify_dirent_safe(mddev->sysfs_state);
4619 mddev_unlock(mddev);
4622 static struct md_sysfs_entry md_array_state =
4623 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4626 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4627 return sprintf(page, "%d\n",
4628 atomic_read(&mddev->max_corr_read_errors));
4632 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4637 rv = kstrtouint(buf, 10, &n);
4642 atomic_set(&mddev->max_corr_read_errors, n);
4646 static struct md_sysfs_entry max_corr_read_errors =
4647 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4648 max_corrected_read_errors_store);
4651 null_show(struct mddev *mddev, char *page)
4657 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4659 /* buf must be %d:%d\n? giving major and minor numbers */
4660 /* The new device is added to the array.
4661 * If the array has a persistent superblock, we read the
4662 * superblock to initialise info and check validity.
4663 * Otherwise, only checking done is that in bind_rdev_to_array,
4664 * which mainly checks size.
4667 int major = simple_strtoul(buf, &e, 10);
4670 struct md_rdev *rdev;
4673 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4675 minor = simple_strtoul(e+1, &e, 10);
4676 if (*e && *e != '\n')
4678 dev = MKDEV(major, minor);
4679 if (major != MAJOR(dev) ||
4680 minor != MINOR(dev))
4683 err = mddev_suspend_and_lock(mddev);
4686 if (mddev->persistent) {
4687 rdev = md_import_device(dev, mddev->major_version,
4688 mddev->minor_version);
4689 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4690 struct md_rdev *rdev0
4691 = list_entry(mddev->disks.next,
4692 struct md_rdev, same_set);
4693 err = super_types[mddev->major_version]
4694 .load_super(rdev, rdev0, mddev->minor_version);
4698 } else if (mddev->external)
4699 rdev = md_import_device(dev, -2, -1);
4701 rdev = md_import_device(dev, -1, -1);
4704 mddev_unlock_and_resume(mddev);
4705 return PTR_ERR(rdev);
4707 err = bind_rdev_to_array(rdev, mddev);
4710 export_rdev(rdev, mddev);
4711 mddev_unlock_and_resume(mddev);
4714 return err ? err : len;
4717 static struct md_sysfs_entry md_new_device =
4718 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4721 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4724 unsigned long chunk, end_chunk;
4727 err = mddev_lock(mddev);
4732 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4734 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4735 if (buf == end) break;
4736 if (*end == '-') { /* range */
4738 end_chunk = simple_strtoul(buf, &end, 0);
4739 if (buf == end) break;
4741 if (*end && !isspace(*end)) break;
4742 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4743 buf = skip_spaces(end);
4745 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4747 mddev_unlock(mddev);
4751 static struct md_sysfs_entry md_bitmap =
4752 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4755 size_show(struct mddev *mddev, char *page)
4757 return sprintf(page, "%llu\n",
4758 (unsigned long long)mddev->dev_sectors / 2);
4761 static int update_size(struct mddev *mddev, sector_t num_sectors);
4764 size_store(struct mddev *mddev, const char *buf, size_t len)
4766 /* If array is inactive, we can reduce the component size, but
4767 * not increase it (except from 0).
4768 * If array is active, we can try an on-line resize
4771 int err = strict_blocks_to_sectors(buf, §ors);
4775 err = mddev_lock(mddev);
4779 err = update_size(mddev, sectors);
4781 md_update_sb(mddev, 1);
4783 if (mddev->dev_sectors == 0 ||
4784 mddev->dev_sectors > sectors)
4785 mddev->dev_sectors = sectors;
4789 mddev_unlock(mddev);
4790 return err ? err : len;
4793 static struct md_sysfs_entry md_size =
4794 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4796 /* Metadata version.
4798 * 'none' for arrays with no metadata (good luck...)
4799 * 'external' for arrays with externally managed metadata,
4800 * or N.M for internally known formats
4803 metadata_show(struct mddev *mddev, char *page)
4805 if (mddev->persistent)
4806 return sprintf(page, "%d.%d\n",
4807 mddev->major_version, mddev->minor_version);
4808 else if (mddev->external)
4809 return sprintf(page, "external:%s\n", mddev->metadata_type);
4811 return sprintf(page, "none\n");
4815 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4820 /* Changing the details of 'external' metadata is
4821 * always permitted. Otherwise there must be
4822 * no devices attached to the array.
4825 err = mddev_lock(mddev);
4829 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4831 else if (!list_empty(&mddev->disks))
4835 if (cmd_match(buf, "none")) {
4836 mddev->persistent = 0;
4837 mddev->external = 0;
4838 mddev->major_version = 0;
4839 mddev->minor_version = 90;
4842 if (strncmp(buf, "external:", 9) == 0) {
4843 size_t namelen = len-9;
4844 if (namelen >= sizeof(mddev->metadata_type))
4845 namelen = sizeof(mddev->metadata_type)-1;
4846 memcpy(mddev->metadata_type, buf+9, namelen);
4847 mddev->metadata_type[namelen] = 0;
4848 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4849 mddev->metadata_type[--namelen] = 0;
4850 mddev->persistent = 0;
4851 mddev->external = 1;
4852 mddev->major_version = 0;
4853 mddev->minor_version = 90;
4856 major = simple_strtoul(buf, &e, 10);
4858 if (e==buf || *e != '.')
4861 minor = simple_strtoul(buf, &e, 10);
4862 if (e==buf || (*e && *e != '\n') )
4865 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4867 mddev->major_version = major;
4868 mddev->minor_version = minor;
4869 mddev->persistent = 1;
4870 mddev->external = 0;
4873 mddev_unlock(mddev);
4877 static struct md_sysfs_entry md_metadata =
4878 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4881 action_show(struct mddev *mddev, char *page)
4883 char *type = "idle";
4884 unsigned long recovery = mddev->recovery;
4885 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4887 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4888 (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4889 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4891 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4892 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4894 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4898 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4900 else if (mddev->reshape_position != MaxSector)
4903 return sprintf(page, "%s\n", type);
4907 * stop_sync_thread() - wait for sync_thread to stop if it's running.
4908 * @mddev: the array.
4909 * @locked: if set, reconfig_mutex will still be held after this function
4910 * return; if not set, reconfig_mutex will be released after this
4912 * @check_seq: if set, only wait for curent running sync_thread to stop, noted
4913 * that new sync_thread can still start.
4915 static void stop_sync_thread(struct mddev *mddev, bool locked, bool check_seq)
4920 sync_seq = atomic_read(&mddev->sync_seq);
4922 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4924 mddev_unlock(mddev);
4928 mddev_unlock(mddev);
4930 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4932 * Thread might be blocked waiting for metadata update which will now
4935 md_wakeup_thread_directly(mddev->sync_thread);
4936 if (work_pending(&mddev->sync_work))
4937 flush_work(&mddev->sync_work);
4939 wait_event(resync_wait,
4940 !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4941 (check_seq && sync_seq != atomic_read(&mddev->sync_seq)));
4944 mddev_lock_nointr(mddev);
4947 static void idle_sync_thread(struct mddev *mddev)
4949 mutex_lock(&mddev->sync_mutex);
4950 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4952 if (mddev_lock(mddev)) {
4953 mutex_unlock(&mddev->sync_mutex);
4957 stop_sync_thread(mddev, false, true);
4958 mutex_unlock(&mddev->sync_mutex);
4961 static void frozen_sync_thread(struct mddev *mddev)
4963 mutex_lock(&mddev->sync_mutex);
4964 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4966 if (mddev_lock(mddev)) {
4967 mutex_unlock(&mddev->sync_mutex);
4971 stop_sync_thread(mddev, false, false);
4972 mutex_unlock(&mddev->sync_mutex);
4976 action_store(struct mddev *mddev, const char *page, size_t len)
4978 if (!mddev->pers || !mddev->pers->sync_request)
4982 if (cmd_match(page, "idle"))
4983 idle_sync_thread(mddev);
4984 else if (cmd_match(page, "frozen"))
4985 frozen_sync_thread(mddev);
4986 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4988 else if (cmd_match(page, "resync"))
4989 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4990 else if (cmd_match(page, "recover")) {
4991 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4992 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4993 } else if (cmd_match(page, "reshape")) {
4995 if (mddev->pers->start_reshape == NULL)
4997 err = mddev_lock(mddev);
4999 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5001 } else if (mddev->reshape_position == MaxSector ||
5002 mddev->pers->check_reshape == NULL ||
5003 mddev->pers->check_reshape(mddev)) {
5004 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5005 err = mddev->pers->start_reshape(mddev);
5008 * If reshape is still in progress, and
5009 * md_check_recovery() can continue to reshape,
5010 * don't restart reshape because data can be
5011 * corrupted for raid456.
5013 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5015 mddev_unlock(mddev);
5019 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
5021 if (cmd_match(page, "check"))
5022 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5023 else if (!cmd_match(page, "repair"))
5025 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5026 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
5027 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5029 if (mddev->ro == MD_AUTO_READ) {
5030 /* A write to sync_action is enough to justify
5031 * canceling read-auto mode
5033 flush_work(&mddev->sync_work);
5034 mddev->ro = MD_RDWR;
5035 md_wakeup_thread(mddev->sync_thread);
5037 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5038 md_wakeup_thread(mddev->thread);
5039 sysfs_notify_dirent_safe(mddev->sysfs_action);
5043 static struct md_sysfs_entry md_scan_mode =
5044 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
5047 last_sync_action_show(struct mddev *mddev, char *page)
5049 return sprintf(page, "%s\n", mddev->last_sync_action);
5052 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
5055 mismatch_cnt_show(struct mddev *mddev, char *page)
5057 return sprintf(page, "%llu\n",
5058 (unsigned long long)
5059 atomic64_read(&mddev->resync_mismatches));
5062 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
5065 sync_min_show(struct mddev *mddev, char *page)
5067 return sprintf(page, "%d (%s)\n", speed_min(mddev),
5068 mddev->sync_speed_min ? "local": "system");
5072 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
5077 if (strncmp(buf, "system", 6)==0) {
5080 rv = kstrtouint(buf, 10, &min);
5086 mddev->sync_speed_min = min;
5090 static struct md_sysfs_entry md_sync_min =
5091 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
5094 sync_max_show(struct mddev *mddev, char *page)
5096 return sprintf(page, "%d (%s)\n", speed_max(mddev),
5097 mddev->sync_speed_max ? "local": "system");
5101 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
5106 if (strncmp(buf, "system", 6)==0) {
5109 rv = kstrtouint(buf, 10, &max);
5115 mddev->sync_speed_max = max;
5119 static struct md_sysfs_entry md_sync_max =
5120 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
5123 degraded_show(struct mddev *mddev, char *page)
5125 return sprintf(page, "%d\n", mddev->degraded);
5127 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
5130 sync_force_parallel_show(struct mddev *mddev, char *page)
5132 return sprintf(page, "%d\n", mddev->parallel_resync);
5136 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
5140 if (kstrtol(buf, 10, &n))
5143 if (n != 0 && n != 1)
5146 mddev->parallel_resync = n;
5148 if (mddev->sync_thread)
5149 wake_up(&resync_wait);
5154 /* force parallel resync, even with shared block devices */
5155 static struct md_sysfs_entry md_sync_force_parallel =
5156 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5157 sync_force_parallel_show, sync_force_parallel_store);
5160 sync_speed_show(struct mddev *mddev, char *page)
5162 unsigned long resync, dt, db;
5163 if (mddev->curr_resync == MD_RESYNC_NONE)
5164 return sprintf(page, "none\n");
5165 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5166 dt = (jiffies - mddev->resync_mark) / HZ;
5168 db = resync - mddev->resync_mark_cnt;
5169 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5172 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5175 sync_completed_show(struct mddev *mddev, char *page)
5177 unsigned long long max_sectors, resync;
5179 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5180 return sprintf(page, "none\n");
5182 if (mddev->curr_resync == MD_RESYNC_YIELDED ||
5183 mddev->curr_resync == MD_RESYNC_DELAYED)
5184 return sprintf(page, "delayed\n");
5186 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5187 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5188 max_sectors = mddev->resync_max_sectors;
5190 max_sectors = mddev->dev_sectors;
5192 resync = mddev->curr_resync_completed;
5193 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5196 static struct md_sysfs_entry md_sync_completed =
5197 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5200 min_sync_show(struct mddev *mddev, char *page)
5202 return sprintf(page, "%llu\n",
5203 (unsigned long long)mddev->resync_min);
5206 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5208 unsigned long long min;
5211 if (kstrtoull(buf, 10, &min))
5214 spin_lock(&mddev->lock);
5216 if (min > mddev->resync_max)
5220 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5223 /* Round down to multiple of 4K for safety */
5224 mddev->resync_min = round_down(min, 8);
5228 spin_unlock(&mddev->lock);
5232 static struct md_sysfs_entry md_min_sync =
5233 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5236 max_sync_show(struct mddev *mddev, char *page)
5238 if (mddev->resync_max == MaxSector)
5239 return sprintf(page, "max\n");
5241 return sprintf(page, "%llu\n",
5242 (unsigned long long)mddev->resync_max);
5245 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5248 spin_lock(&mddev->lock);
5249 if (strncmp(buf, "max", 3) == 0)
5250 mddev->resync_max = MaxSector;
5252 unsigned long long max;
5256 if (kstrtoull(buf, 10, &max))
5258 if (max < mddev->resync_min)
5262 if (max < mddev->resync_max && md_is_rdwr(mddev) &&
5263 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5266 /* Must be a multiple of chunk_size */
5267 chunk = mddev->chunk_sectors;
5269 sector_t temp = max;
5272 if (sector_div(temp, chunk))
5275 mddev->resync_max = max;
5277 wake_up(&mddev->recovery_wait);
5280 spin_unlock(&mddev->lock);
5284 static struct md_sysfs_entry md_max_sync =
5285 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5288 suspend_lo_show(struct mddev *mddev, char *page)
5290 return sprintf(page, "%llu\n",
5291 (unsigned long long)READ_ONCE(mddev->suspend_lo));
5295 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5297 unsigned long long new;
5300 err = kstrtoull(buf, 10, &new);
5303 if (new != (sector_t)new)
5306 err = mddev_suspend(mddev, true);
5310 WRITE_ONCE(mddev->suspend_lo, new);
5311 mddev_resume(mddev);
5315 static struct md_sysfs_entry md_suspend_lo =
5316 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5319 suspend_hi_show(struct mddev *mddev, char *page)
5321 return sprintf(page, "%llu\n",
5322 (unsigned long long)READ_ONCE(mddev->suspend_hi));
5326 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5328 unsigned long long new;
5331 err = kstrtoull(buf, 10, &new);
5334 if (new != (sector_t)new)
5337 err = mddev_suspend(mddev, true);
5341 WRITE_ONCE(mddev->suspend_hi, new);
5342 mddev_resume(mddev);
5346 static struct md_sysfs_entry md_suspend_hi =
5347 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5350 reshape_position_show(struct mddev *mddev, char *page)
5352 if (mddev->reshape_position != MaxSector)
5353 return sprintf(page, "%llu\n",
5354 (unsigned long long)mddev->reshape_position);
5355 strcpy(page, "none\n");
5360 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5362 struct md_rdev *rdev;
5363 unsigned long long new;
5366 err = kstrtoull(buf, 10, &new);
5369 if (new != (sector_t)new)
5371 err = mddev_lock(mddev);
5377 mddev->reshape_position = new;
5378 mddev->delta_disks = 0;
5379 mddev->reshape_backwards = 0;
5380 mddev->new_level = mddev->level;
5381 mddev->new_layout = mddev->layout;
5382 mddev->new_chunk_sectors = mddev->chunk_sectors;
5383 rdev_for_each(rdev, mddev)
5384 rdev->new_data_offset = rdev->data_offset;
5387 mddev_unlock(mddev);
5391 static struct md_sysfs_entry md_reshape_position =
5392 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5393 reshape_position_store);
5396 reshape_direction_show(struct mddev *mddev, char *page)
5398 return sprintf(page, "%s\n",
5399 mddev->reshape_backwards ? "backwards" : "forwards");
5403 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5408 if (cmd_match(buf, "forwards"))
5410 else if (cmd_match(buf, "backwards"))
5414 if (mddev->reshape_backwards == backwards)
5417 err = mddev_lock(mddev);
5420 /* check if we are allowed to change */
5421 if (mddev->delta_disks)
5423 else if (mddev->persistent &&
5424 mddev->major_version == 0)
5427 mddev->reshape_backwards = backwards;
5428 mddev_unlock(mddev);
5432 static struct md_sysfs_entry md_reshape_direction =
5433 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5434 reshape_direction_store);
5437 array_size_show(struct mddev *mddev, char *page)
5439 if (mddev->external_size)
5440 return sprintf(page, "%llu\n",
5441 (unsigned long long)mddev->array_sectors/2);
5443 return sprintf(page, "default\n");
5447 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5452 err = mddev_lock(mddev);
5456 /* cluster raid doesn't support change array_sectors */
5457 if (mddev_is_clustered(mddev)) {
5458 mddev_unlock(mddev);
5462 if (strncmp(buf, "default", 7) == 0) {
5464 sectors = mddev->pers->size(mddev, 0, 0);
5466 sectors = mddev->array_sectors;
5468 mddev->external_size = 0;
5470 if (strict_blocks_to_sectors(buf, §ors) < 0)
5472 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5475 mddev->external_size = 1;
5479 mddev->array_sectors = sectors;
5481 set_capacity_and_notify(mddev->gendisk,
5482 mddev->array_sectors);
5484 mddev_unlock(mddev);
5488 static struct md_sysfs_entry md_array_size =
5489 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5493 consistency_policy_show(struct mddev *mddev, char *page)
5497 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5498 ret = sprintf(page, "journal\n");
5499 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5500 ret = sprintf(page, "ppl\n");
5501 } else if (mddev->bitmap) {
5502 ret = sprintf(page, "bitmap\n");
5503 } else if (mddev->pers) {
5504 if (mddev->pers->sync_request)
5505 ret = sprintf(page, "resync\n");
5507 ret = sprintf(page, "none\n");
5509 ret = sprintf(page, "unknown\n");
5516 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5521 if (mddev->pers->change_consistency_policy)
5522 err = mddev->pers->change_consistency_policy(mddev, buf);
5525 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5526 set_bit(MD_HAS_PPL, &mddev->flags);
5531 return err ? err : len;
5534 static struct md_sysfs_entry md_consistency_policy =
5535 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5536 consistency_policy_store);
5538 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5540 return sprintf(page, "%d\n", mddev->fail_last_dev);
5544 * Setting fail_last_dev to true to allow last device to be forcibly removed
5545 * from RAID1/RAID10.
5548 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5553 ret = kstrtobool(buf, &value);
5557 if (value != mddev->fail_last_dev)
5558 mddev->fail_last_dev = value;
5562 static struct md_sysfs_entry md_fail_last_dev =
5563 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5564 fail_last_dev_store);
5566 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5568 if (mddev->pers == NULL || (mddev->pers->level != 1))
5569 return sprintf(page, "n/a\n");
5571 return sprintf(page, "%d\n", mddev->serialize_policy);
5575 * Setting serialize_policy to true to enforce write IO is not reordered
5579 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5584 err = kstrtobool(buf, &value);
5588 if (value == mddev->serialize_policy)
5591 err = mddev_suspend_and_lock(mddev);
5594 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5595 pr_err("md: serialize_policy is only effective for raid1\n");
5601 mddev_create_serial_pool(mddev, NULL);
5603 mddev_destroy_serial_pool(mddev, NULL);
5604 mddev->serialize_policy = value;
5606 mddev_unlock_and_resume(mddev);
5610 static struct md_sysfs_entry md_serialize_policy =
5611 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5612 serialize_policy_store);
5615 static struct attribute *md_default_attrs[] = {
5618 &md_raid_disks.attr,
5620 &md_chunk_size.attr,
5622 &md_resync_start.attr,
5624 &md_new_device.attr,
5625 &md_safe_delay.attr,
5626 &md_array_state.attr,
5627 &md_reshape_position.attr,
5628 &md_reshape_direction.attr,
5629 &md_array_size.attr,
5630 &max_corr_read_errors.attr,
5631 &md_consistency_policy.attr,
5632 &md_fail_last_dev.attr,
5633 &md_serialize_policy.attr,
5637 static const struct attribute_group md_default_group = {
5638 .attrs = md_default_attrs,
5641 static struct attribute *md_redundancy_attrs[] = {
5643 &md_last_scan_mode.attr,
5644 &md_mismatches.attr,
5647 &md_sync_speed.attr,
5648 &md_sync_force_parallel.attr,
5649 &md_sync_completed.attr,
5652 &md_suspend_lo.attr,
5653 &md_suspend_hi.attr,
5658 static const struct attribute_group md_redundancy_group = {
5660 .attrs = md_redundancy_attrs,
5663 static const struct attribute_group *md_attr_groups[] = {
5670 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5672 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5673 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5678 spin_lock(&all_mddevs_lock);
5679 if (!mddev_get(mddev)) {
5680 spin_unlock(&all_mddevs_lock);
5683 spin_unlock(&all_mddevs_lock);
5685 rv = entry->show(mddev, page);
5691 md_attr_store(struct kobject *kobj, struct attribute *attr,
5692 const char *page, size_t length)
5694 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5695 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5700 if (!capable(CAP_SYS_ADMIN))
5702 spin_lock(&all_mddevs_lock);
5703 if (!mddev_get(mddev)) {
5704 spin_unlock(&all_mddevs_lock);
5707 spin_unlock(&all_mddevs_lock);
5708 rv = entry->store(mddev, page, length);
5713 static void md_kobj_release(struct kobject *ko)
5715 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5717 if (mddev->sysfs_state)
5718 sysfs_put(mddev->sysfs_state);
5719 if (mddev->sysfs_level)
5720 sysfs_put(mddev->sysfs_level);
5722 del_gendisk(mddev->gendisk);
5723 put_disk(mddev->gendisk);
5726 static const struct sysfs_ops md_sysfs_ops = {
5727 .show = md_attr_show,
5728 .store = md_attr_store,
5730 static const struct kobj_type md_ktype = {
5731 .release = md_kobj_release,
5732 .sysfs_ops = &md_sysfs_ops,
5733 .default_groups = md_attr_groups,
5738 static void mddev_delayed_delete(struct work_struct *ws)
5740 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5742 kobject_put(&mddev->kobj);
5745 struct mddev *md_alloc(dev_t dev, char *name)
5748 * If dev is zero, name is the name of a device to allocate with
5749 * an arbitrary minor number. It will be "md_???"
5750 * If dev is non-zero it must be a device number with a MAJOR of
5751 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5752 * the device is being created by opening a node in /dev.
5753 * If "name" is not NULL, the device is being created by
5754 * writing to /sys/module/md_mod/parameters/new_array.
5756 static DEFINE_MUTEX(disks_mutex);
5757 struct mddev *mddev;
5758 struct gendisk *disk;
5765 * Wait for any previous instance of this device to be completely
5766 * removed (mddev_delayed_delete).
5768 flush_workqueue(md_misc_wq);
5770 mutex_lock(&disks_mutex);
5771 mddev = mddev_alloc(dev);
5772 if (IS_ERR(mddev)) {
5773 error = PTR_ERR(mddev);
5777 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5778 shift = partitioned ? MdpMinorShift : 0;
5779 unit = MINOR(mddev->unit) >> shift;
5782 /* Need to ensure that 'name' is not a duplicate.
5784 struct mddev *mddev2;
5785 spin_lock(&all_mddevs_lock);
5787 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5788 if (mddev2->gendisk &&
5789 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5790 spin_unlock(&all_mddevs_lock);
5792 goto out_free_mddev;
5794 spin_unlock(&all_mddevs_lock);
5798 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5800 mddev->hold_active = UNTIL_STOP;
5803 disk = blk_alloc_disk(NUMA_NO_NODE);
5805 goto out_free_mddev;
5807 disk->major = MAJOR(mddev->unit);
5808 disk->first_minor = unit << shift;
5809 disk->minors = 1 << shift;
5811 strcpy(disk->disk_name, name);
5812 else if (partitioned)
5813 sprintf(disk->disk_name, "md_d%d", unit);
5815 sprintf(disk->disk_name, "md%d", unit);
5816 disk->fops = &md_fops;
5817 disk->private_data = mddev;
5819 mddev->queue = disk->queue;
5820 blk_set_stacking_limits(&mddev->queue->limits);
5821 blk_queue_write_cache(mddev->queue, true, true);
5822 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5823 mddev->gendisk = disk;
5824 error = add_disk(disk);
5828 kobject_init(&mddev->kobj, &md_ktype);
5829 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5832 * The disk is already live at this point. Clear the hold flag
5833 * and let mddev_put take care of the deletion, as it isn't any
5834 * different from a normal close on last release now.
5836 mddev->hold_active = 0;
5837 mutex_unlock(&disks_mutex);
5839 return ERR_PTR(error);
5842 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5843 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5844 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5845 mutex_unlock(&disks_mutex);
5853 mutex_unlock(&disks_mutex);
5854 return ERR_PTR(error);
5857 static int md_alloc_and_put(dev_t dev, char *name)
5859 struct mddev *mddev = md_alloc(dev, name);
5862 return PTR_ERR(mddev);
5867 static void md_probe(dev_t dev)
5869 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5872 md_alloc_and_put(dev, NULL);
5875 static int add_named_array(const char *val, const struct kernel_param *kp)
5878 * val must be "md_*" or "mdNNN".
5879 * For "md_*" we allocate an array with a large free minor number, and
5880 * set the name to val. val must not already be an active name.
5881 * For "mdNNN" we allocate an array with the minor number NNN
5882 * which must not already be in use.
5884 int len = strlen(val);
5885 char buf[DISK_NAME_LEN];
5886 unsigned long devnum;
5888 while (len && val[len-1] == '\n')
5890 if (len >= DISK_NAME_LEN)
5892 strscpy(buf, val, len+1);
5893 if (strncmp(buf, "md_", 3) == 0)
5894 return md_alloc_and_put(0, buf);
5895 if (strncmp(buf, "md", 2) == 0 &&
5897 kstrtoul(buf+2, 10, &devnum) == 0 &&
5898 devnum <= MINORMASK)
5899 return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
5904 static void md_safemode_timeout(struct timer_list *t)
5906 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5908 mddev->safemode = 1;
5909 if (mddev->external)
5910 sysfs_notify_dirent_safe(mddev->sysfs_state);
5912 md_wakeup_thread(mddev->thread);
5915 static int start_dirty_degraded;
5917 int md_run(struct mddev *mddev)
5920 struct md_rdev *rdev;
5921 struct md_personality *pers;
5924 if (list_empty(&mddev->disks))
5925 /* cannot run an array with no devices.. */
5930 /* Cannot run until previous stop completes properly */
5931 if (mddev->sysfs_active)
5935 * Analyze all RAID superblock(s)
5937 if (!mddev->raid_disks) {
5938 if (!mddev->persistent)
5940 err = analyze_sbs(mddev);
5945 if (mddev->level != LEVEL_NONE)
5946 request_module("md-level-%d", mddev->level);
5947 else if (mddev->clevel[0])
5948 request_module("md-%s", mddev->clevel);
5951 * Drop all container device buffers, from now on
5952 * the only valid external interface is through the md
5955 mddev->has_superblocks = false;
5956 rdev_for_each(rdev, mddev) {
5957 if (test_bit(Faulty, &rdev->flags))
5959 sync_blockdev(rdev->bdev);
5960 invalidate_bdev(rdev->bdev);
5961 if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
5962 mddev->ro = MD_RDONLY;
5964 set_disk_ro(mddev->gendisk, 1);
5968 mddev->has_superblocks = true;
5970 /* perform some consistency tests on the device.
5971 * We don't want the data to overlap the metadata,
5972 * Internal Bitmap issues have been handled elsewhere.
5974 if (rdev->meta_bdev) {
5975 /* Nothing to check */;
5976 } else if (rdev->data_offset < rdev->sb_start) {
5977 if (mddev->dev_sectors &&
5978 rdev->data_offset + mddev->dev_sectors
5980 pr_warn("md: %s: data overlaps metadata\n",
5985 if (rdev->sb_start + rdev->sb_size/512
5986 > rdev->data_offset) {
5987 pr_warn("md: %s: metadata overlaps data\n",
5992 sysfs_notify_dirent_safe(rdev->sysfs_state);
5993 nowait = nowait && bdev_nowait(rdev->bdev);
5996 if (!bioset_initialized(&mddev->bio_set)) {
5997 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
6001 if (!bioset_initialized(&mddev->sync_set)) {
6002 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
6007 if (!bioset_initialized(&mddev->io_clone_set)) {
6008 err = bioset_init(&mddev->io_clone_set, BIO_POOL_SIZE,
6009 offsetof(struct md_io_clone, bio_clone), 0);
6014 spin_lock(&pers_lock);
6015 pers = find_pers(mddev->level, mddev->clevel);
6016 if (!pers || !try_module_get(pers->owner)) {
6017 spin_unlock(&pers_lock);
6018 if (mddev->level != LEVEL_NONE)
6019 pr_warn("md: personality for level %d is not loaded!\n",
6022 pr_warn("md: personality for level %s is not loaded!\n",
6027 spin_unlock(&pers_lock);
6028 if (mddev->level != pers->level) {
6029 mddev->level = pers->level;
6030 mddev->new_level = pers->level;
6032 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
6034 if (mddev->reshape_position != MaxSector &&
6035 pers->start_reshape == NULL) {
6036 /* This personality cannot handle reshaping... */
6037 module_put(pers->owner);
6042 if (pers->sync_request) {
6043 /* Warn if this is a potentially silly
6046 struct md_rdev *rdev2;
6049 rdev_for_each(rdev, mddev)
6050 rdev_for_each(rdev2, mddev) {
6052 rdev->bdev->bd_disk ==
6053 rdev2->bdev->bd_disk) {
6054 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
6063 pr_warn("True protection against single-disk failure might be compromised.\n");
6066 mddev->recovery = 0;
6067 /* may be over-ridden by personality */
6068 mddev->resync_max_sectors = mddev->dev_sectors;
6070 mddev->ok_start_degraded = start_dirty_degraded;
6072 if (start_readonly && md_is_rdwr(mddev))
6073 mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
6075 err = pers->run(mddev);
6077 pr_warn("md: pers->run() failed ...\n");
6078 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
6079 WARN_ONCE(!mddev->external_size,
6080 "%s: default size too small, but 'external_size' not in effect?\n",
6082 pr_warn("md: invalid array_size %llu > default size %llu\n",
6083 (unsigned long long)mddev->array_sectors / 2,
6084 (unsigned long long)pers->size(mddev, 0, 0) / 2);
6087 if (err == 0 && pers->sync_request &&
6088 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
6089 struct bitmap *bitmap;
6091 bitmap = md_bitmap_create(mddev, -1);
6092 if (IS_ERR(bitmap)) {
6093 err = PTR_ERR(bitmap);
6094 pr_warn("%s: failed to create bitmap (%d)\n",
6095 mdname(mddev), err);
6097 mddev->bitmap = bitmap;
6103 if (mddev->bitmap_info.max_write_behind > 0) {
6104 bool create_pool = false;
6106 rdev_for_each(rdev, mddev) {
6107 if (test_bit(WriteMostly, &rdev->flags) &&
6108 rdev_init_serial(rdev))
6111 if (create_pool && mddev->serial_info_pool == NULL) {
6112 mddev->serial_info_pool =
6113 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
6114 sizeof(struct serial_info));
6115 if (!mddev->serial_info_pool) {
6125 rdev_for_each(rdev, mddev) {
6126 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
6131 if (mddev->degraded)
6134 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6136 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6137 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6139 /* Set the NOWAIT flags if all underlying devices support it */
6141 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
6143 if (pers->sync_request) {
6144 if (mddev->kobj.sd &&
6145 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6146 pr_warn("md: cannot register extra attributes for %s\n",
6148 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6149 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6150 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6151 } else if (mddev->ro == MD_AUTO_READ)
6152 mddev->ro = MD_RDWR;
6154 atomic_set(&mddev->max_corr_read_errors,
6155 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6156 mddev->safemode = 0;
6157 if (mddev_is_clustered(mddev))
6158 mddev->safemode_delay = 0;
6160 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6163 spin_lock(&mddev->lock);
6165 spin_unlock(&mddev->lock);
6166 rdev_for_each(rdev, mddev)
6167 if (rdev->raid_disk >= 0)
6168 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6170 if (mddev->degraded && md_is_rdwr(mddev))
6171 /* This ensures that recovering status is reported immediately
6172 * via sysfs - until a lack of spares is confirmed.
6174 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6175 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6177 if (mddev->sb_flags)
6178 md_update_sb(mddev, 0);
6184 mddev_detach(mddev);
6186 pers->free(mddev, mddev->private);
6187 mddev->private = NULL;
6188 module_put(pers->owner);
6189 md_bitmap_destroy(mddev);
6191 bioset_exit(&mddev->io_clone_set);
6193 bioset_exit(&mddev->sync_set);
6195 bioset_exit(&mddev->bio_set);
6198 EXPORT_SYMBOL_GPL(md_run);
6200 int do_md_run(struct mddev *mddev)
6204 set_bit(MD_NOT_READY, &mddev->flags);
6205 err = md_run(mddev);
6208 err = md_bitmap_load(mddev);
6210 md_bitmap_destroy(mddev);
6214 if (mddev_is_clustered(mddev))
6215 md_allow_write(mddev);
6217 /* run start up tasks that require md_thread */
6220 md_wakeup_thread(mddev->thread);
6221 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6223 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6224 clear_bit(MD_NOT_READY, &mddev->flags);
6226 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6227 sysfs_notify_dirent_safe(mddev->sysfs_state);
6228 sysfs_notify_dirent_safe(mddev->sysfs_action);
6229 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6231 clear_bit(MD_NOT_READY, &mddev->flags);
6235 int md_start(struct mddev *mddev)
6239 if (mddev->pers->start) {
6240 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6241 md_wakeup_thread(mddev->thread);
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->thread);
6287 md_wakeup_thread(mddev->sync_thread);
6288 sysfs_notify_dirent_safe(mddev->sysfs_state);
6292 static void md_clean(struct mddev *mddev)
6294 mddev->array_sectors = 0;
6295 mddev->external_size = 0;
6296 mddev->dev_sectors = 0;
6297 mddev->raid_disks = 0;
6298 mddev->recovery_cp = 0;
6299 mddev->resync_min = 0;
6300 mddev->resync_max = MaxSector;
6301 mddev->reshape_position = MaxSector;
6302 /* we still need mddev->external in export_rdev, do not clear it yet */
6303 mddev->persistent = 0;
6304 mddev->level = LEVEL_NONE;
6305 mddev->clevel[0] = 0;
6307 mddev->sb_flags = 0;
6308 mddev->ro = MD_RDWR;
6309 mddev->metadata_type[0] = 0;
6310 mddev->chunk_sectors = 0;
6311 mddev->ctime = mddev->utime = 0;
6313 mddev->max_disks = 0;
6315 mddev->can_decrease_events = 0;
6316 mddev->delta_disks = 0;
6317 mddev->reshape_backwards = 0;
6318 mddev->new_level = LEVEL_NONE;
6319 mddev->new_layout = 0;
6320 mddev->new_chunk_sectors = 0;
6321 mddev->curr_resync = MD_RESYNC_NONE;
6322 atomic64_set(&mddev->resync_mismatches, 0);
6323 mddev->suspend_lo = mddev->suspend_hi = 0;
6324 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6325 mddev->recovery = 0;
6328 mddev->degraded = 0;
6329 mddev->safemode = 0;
6330 mddev->private = NULL;
6331 mddev->cluster_info = NULL;
6332 mddev->bitmap_info.offset = 0;
6333 mddev->bitmap_info.default_offset = 0;
6334 mddev->bitmap_info.default_space = 0;
6335 mddev->bitmap_info.chunksize = 0;
6336 mddev->bitmap_info.daemon_sleep = 0;
6337 mddev->bitmap_info.max_write_behind = 0;
6338 mddev->bitmap_info.nodes = 0;
6341 static void __md_stop_writes(struct mddev *mddev)
6343 stop_sync_thread(mddev, true, false);
6344 del_timer_sync(&mddev->safemode_timer);
6346 if (mddev->pers && mddev->pers->quiesce) {
6347 mddev->pers->quiesce(mddev, 1);
6348 mddev->pers->quiesce(mddev, 0);
6350 md_bitmap_flush(mddev);
6352 if (md_is_rdwr(mddev) &&
6353 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6355 /* mark array as shutdown cleanly */
6356 if (!mddev_is_clustered(mddev))
6358 md_update_sb(mddev, 1);
6360 /* disable policy to guarantee rdevs free resources for serialization */
6361 mddev->serialize_policy = 0;
6362 mddev_destroy_serial_pool(mddev, NULL);
6365 void md_stop_writes(struct mddev *mddev)
6367 mddev_lock_nointr(mddev);
6368 __md_stop_writes(mddev);
6369 mddev_unlock(mddev);
6371 EXPORT_SYMBOL_GPL(md_stop_writes);
6373 static void mddev_detach(struct mddev *mddev)
6375 md_bitmap_wait_behind_writes(mddev);
6376 if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
6377 mddev->pers->quiesce(mddev, 1);
6378 mddev->pers->quiesce(mddev, 0);
6380 md_unregister_thread(mddev, &mddev->thread);
6382 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6385 static void __md_stop(struct mddev *mddev)
6387 struct md_personality *pers = mddev->pers;
6388 md_bitmap_destroy(mddev);
6389 mddev_detach(mddev);
6390 spin_lock(&mddev->lock);
6392 spin_unlock(&mddev->lock);
6394 pers->free(mddev, mddev->private);
6395 mddev->private = NULL;
6396 if (pers->sync_request && mddev->to_remove == NULL)
6397 mddev->to_remove = &md_redundancy_group;
6398 module_put(pers->owner);
6399 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6401 bioset_exit(&mddev->bio_set);
6402 bioset_exit(&mddev->sync_set);
6403 bioset_exit(&mddev->io_clone_set);
6406 void md_stop(struct mddev *mddev)
6408 lockdep_assert_held(&mddev->reconfig_mutex);
6410 /* stop the array and free an attached data structures.
6411 * This is called from dm-raid
6413 __md_stop_writes(mddev);
6417 EXPORT_SYMBOL_GPL(md_stop);
6419 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6424 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6427 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6429 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6430 md_wakeup_thread(mddev->thread);
6433 stop_sync_thread(mddev, false, false);
6434 wait_event(mddev->sb_wait,
6435 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6436 mddev_lock_nointr(mddev);
6438 mutex_lock(&mddev->open_mutex);
6439 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6440 mddev->sync_thread ||
6441 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6442 pr_warn("md: %s still in use.\n",mdname(mddev));
6448 __md_stop_writes(mddev);
6450 if (mddev->ro == MD_RDONLY) {
6455 mddev->ro = MD_RDONLY;
6456 set_disk_ro(mddev->gendisk, 1);
6460 if ((mddev->pers && !err) || did_freeze) {
6461 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6462 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6463 md_wakeup_thread(mddev->thread);
6464 sysfs_notify_dirent_safe(mddev->sysfs_state);
6467 mutex_unlock(&mddev->open_mutex);
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,
6476 struct block_device *bdev)
6478 struct gendisk *disk = mddev->gendisk;
6479 struct md_rdev *rdev;
6482 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6484 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6485 md_wakeup_thread(mddev->thread);
6488 stop_sync_thread(mddev, true, false);
6490 mutex_lock(&mddev->open_mutex);
6491 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6492 mddev->sysfs_active ||
6493 mddev->sync_thread ||
6494 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6495 pr_warn("md: %s still in use.\n",mdname(mddev));
6496 mutex_unlock(&mddev->open_mutex);
6498 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6499 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6500 md_wakeup_thread(mddev->thread);
6505 if (!md_is_rdwr(mddev))
6506 set_disk_ro(disk, 0);
6508 __md_stop_writes(mddev);
6511 /* tell userspace to handle 'inactive' */
6512 sysfs_notify_dirent_safe(mddev->sysfs_state);
6514 rdev_for_each(rdev, mddev)
6515 if (rdev->raid_disk >= 0)
6516 sysfs_unlink_rdev(mddev, rdev);
6518 set_capacity_and_notify(disk, 0);
6519 mutex_unlock(&mddev->open_mutex);
6522 if (!md_is_rdwr(mddev))
6523 mddev->ro = MD_RDWR;
6525 mutex_unlock(&mddev->open_mutex);
6527 * Free resources if final stop
6530 pr_info("md: %s stopped.\n", mdname(mddev));
6532 if (mddev->bitmap_info.file) {
6533 struct file *f = mddev->bitmap_info.file;
6534 spin_lock(&mddev->lock);
6535 mddev->bitmap_info.file = NULL;
6536 spin_unlock(&mddev->lock);
6539 mddev->bitmap_info.offset = 0;
6541 export_array(mddev);
6544 if (mddev->hold_active == UNTIL_STOP)
6545 mddev->hold_active = 0;
6548 sysfs_notify_dirent_safe(mddev->sysfs_state);
6553 static void autorun_array(struct mddev *mddev)
6555 struct md_rdev *rdev;
6558 if (list_empty(&mddev->disks))
6561 pr_info("md: running: ");
6563 rdev_for_each(rdev, mddev) {
6564 pr_cont("<%pg>", rdev->bdev);
6568 err = do_md_run(mddev);
6570 pr_warn("md: do_md_run() returned %d\n", err);
6571 do_md_stop(mddev, 0, NULL);
6576 * lets try to run arrays based on all disks that have arrived
6577 * until now. (those are in pending_raid_disks)
6579 * the method: pick the first pending disk, collect all disks with
6580 * the same UUID, remove all from the pending list and put them into
6581 * the 'same_array' list. Then order this list based on superblock
6582 * update time (freshest comes first), kick out 'old' disks and
6583 * compare superblocks. If everything's fine then run it.
6585 * If "unit" is allocated, then bump its reference count
6587 static void autorun_devices(int part)
6589 struct md_rdev *rdev0, *rdev, *tmp;
6590 struct mddev *mddev;
6592 pr_info("md: autorun ...\n");
6593 while (!list_empty(&pending_raid_disks)) {
6596 LIST_HEAD(candidates);
6597 rdev0 = list_entry(pending_raid_disks.next,
6598 struct md_rdev, same_set);
6600 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6601 INIT_LIST_HEAD(&candidates);
6602 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6603 if (super_90_load(rdev, rdev0, 0) >= 0) {
6604 pr_debug("md: adding %pg ...\n",
6606 list_move(&rdev->same_set, &candidates);
6609 * now we have a set of devices, with all of them having
6610 * mostly sane superblocks. It's time to allocate the
6614 dev = MKDEV(mdp_major,
6615 rdev0->preferred_minor << MdpMinorShift);
6616 unit = MINOR(dev) >> MdpMinorShift;
6618 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6621 if (rdev0->preferred_minor != unit) {
6622 pr_warn("md: unit number in %pg is bad: %d\n",
6623 rdev0->bdev, rdev0->preferred_minor);
6627 mddev = md_alloc(dev, NULL);
6631 if (mddev_suspend_and_lock(mddev))
6632 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6633 else if (mddev->raid_disks || mddev->major_version
6634 || !list_empty(&mddev->disks)) {
6635 pr_warn("md: %s already running, cannot run %pg\n",
6636 mdname(mddev), rdev0->bdev);
6637 mddev_unlock_and_resume(mddev);
6639 pr_debug("md: created %s\n", mdname(mddev));
6640 mddev->persistent = 1;
6641 rdev_for_each_list(rdev, tmp, &candidates) {
6642 list_del_init(&rdev->same_set);
6643 if (bind_rdev_to_array(rdev, mddev))
6644 export_rdev(rdev, mddev);
6646 autorun_array(mddev);
6647 mddev_unlock_and_resume(mddev);
6649 /* on success, candidates will be empty, on error
6652 rdev_for_each_list(rdev, tmp, &candidates) {
6653 list_del_init(&rdev->same_set);
6654 export_rdev(rdev, mddev);
6658 pr_info("md: ... autorun DONE.\n");
6660 #endif /* !MODULE */
6662 static int get_version(void __user *arg)
6666 ver.major = MD_MAJOR_VERSION;
6667 ver.minor = MD_MINOR_VERSION;
6668 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6670 if (copy_to_user(arg, &ver, sizeof(ver)))
6676 static int get_array_info(struct mddev *mddev, void __user *arg)
6678 mdu_array_info_t info;
6679 int nr,working,insync,failed,spare;
6680 struct md_rdev *rdev;
6682 nr = working = insync = failed = spare = 0;
6684 rdev_for_each_rcu(rdev, mddev) {
6686 if (test_bit(Faulty, &rdev->flags))
6690 if (test_bit(In_sync, &rdev->flags))
6692 else if (test_bit(Journal, &rdev->flags))
6693 /* TODO: add journal count to md_u.h */
6701 info.major_version = mddev->major_version;
6702 info.minor_version = mddev->minor_version;
6703 info.patch_version = MD_PATCHLEVEL_VERSION;
6704 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6705 info.level = mddev->level;
6706 info.size = mddev->dev_sectors / 2;
6707 if (info.size != mddev->dev_sectors / 2) /* overflow */
6710 info.raid_disks = mddev->raid_disks;
6711 info.md_minor = mddev->md_minor;
6712 info.not_persistent= !mddev->persistent;
6714 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6717 info.state = (1<<MD_SB_CLEAN);
6718 if (mddev->bitmap && mddev->bitmap_info.offset)
6719 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6720 if (mddev_is_clustered(mddev))
6721 info.state |= (1<<MD_SB_CLUSTERED);
6722 info.active_disks = insync;
6723 info.working_disks = working;
6724 info.failed_disks = failed;
6725 info.spare_disks = spare;
6727 info.layout = mddev->layout;
6728 info.chunk_size = mddev->chunk_sectors << 9;
6730 if (copy_to_user(arg, &info, sizeof(info)))
6736 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6738 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6742 file = kzalloc(sizeof(*file), GFP_NOIO);
6747 spin_lock(&mddev->lock);
6748 /* bitmap enabled */
6749 if (mddev->bitmap_info.file) {
6750 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6751 sizeof(file->pathname));
6755 memmove(file->pathname, ptr,
6756 sizeof(file->pathname)-(ptr-file->pathname));
6758 spin_unlock(&mddev->lock);
6761 copy_to_user(arg, file, sizeof(*file)))
6768 static int get_disk_info(struct mddev *mddev, void __user * arg)
6770 mdu_disk_info_t info;
6771 struct md_rdev *rdev;
6773 if (copy_from_user(&info, arg, sizeof(info)))
6777 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6779 info.major = MAJOR(rdev->bdev->bd_dev);
6780 info.minor = MINOR(rdev->bdev->bd_dev);
6781 info.raid_disk = rdev->raid_disk;
6783 if (test_bit(Faulty, &rdev->flags))
6784 info.state |= (1<<MD_DISK_FAULTY);
6785 else if (test_bit(In_sync, &rdev->flags)) {
6786 info.state |= (1<<MD_DISK_ACTIVE);
6787 info.state |= (1<<MD_DISK_SYNC);
6789 if (test_bit(Journal, &rdev->flags))
6790 info.state |= (1<<MD_DISK_JOURNAL);
6791 if (test_bit(WriteMostly, &rdev->flags))
6792 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6793 if (test_bit(FailFast, &rdev->flags))
6794 info.state |= (1<<MD_DISK_FAILFAST);
6796 info.major = info.minor = 0;
6797 info.raid_disk = -1;
6798 info.state = (1<<MD_DISK_REMOVED);
6802 if (copy_to_user(arg, &info, sizeof(info)))
6808 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6810 struct md_rdev *rdev;
6811 dev_t dev = MKDEV(info->major,info->minor);
6813 if (mddev_is_clustered(mddev) &&
6814 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6815 pr_warn("%s: Cannot add to clustered mddev.\n",
6820 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6823 if (!mddev->raid_disks) {
6825 /* expecting a device which has a superblock */
6826 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6828 pr_warn("md: md_import_device returned %ld\n",
6830 return PTR_ERR(rdev);
6832 if (!list_empty(&mddev->disks)) {
6833 struct md_rdev *rdev0
6834 = list_entry(mddev->disks.next,
6835 struct md_rdev, same_set);
6836 err = super_types[mddev->major_version]
6837 .load_super(rdev, rdev0, mddev->minor_version);
6839 pr_warn("md: %pg has different UUID to %pg\n",
6842 export_rdev(rdev, mddev);
6846 err = bind_rdev_to_array(rdev, mddev);
6848 export_rdev(rdev, mddev);
6853 * md_add_new_disk can be used once the array is assembled
6854 * to add "hot spares". They must already have a superblock
6859 if (!mddev->pers->hot_add_disk) {
6860 pr_warn("%s: personality does not support diskops!\n",
6864 if (mddev->persistent)
6865 rdev = md_import_device(dev, mddev->major_version,
6866 mddev->minor_version);
6868 rdev = md_import_device(dev, -1, -1);
6870 pr_warn("md: md_import_device returned %ld\n",
6872 return PTR_ERR(rdev);
6874 /* set saved_raid_disk if appropriate */
6875 if (!mddev->persistent) {
6876 if (info->state & (1<<MD_DISK_SYNC) &&
6877 info->raid_disk < mddev->raid_disks) {
6878 rdev->raid_disk = info->raid_disk;
6879 clear_bit(Bitmap_sync, &rdev->flags);
6881 rdev->raid_disk = -1;
6882 rdev->saved_raid_disk = rdev->raid_disk;
6884 super_types[mddev->major_version].
6885 validate_super(mddev, NULL/*freshest*/, rdev);
6886 if ((info->state & (1<<MD_DISK_SYNC)) &&
6887 rdev->raid_disk != info->raid_disk) {
6888 /* This was a hot-add request, but events doesn't
6889 * match, so reject it.
6891 export_rdev(rdev, mddev);
6895 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6896 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6897 set_bit(WriteMostly, &rdev->flags);
6899 clear_bit(WriteMostly, &rdev->flags);
6900 if (info->state & (1<<MD_DISK_FAILFAST))
6901 set_bit(FailFast, &rdev->flags);
6903 clear_bit(FailFast, &rdev->flags);
6905 if (info->state & (1<<MD_DISK_JOURNAL)) {
6906 struct md_rdev *rdev2;
6907 bool has_journal = false;
6909 /* make sure no existing journal disk */
6910 rdev_for_each(rdev2, mddev) {
6911 if (test_bit(Journal, &rdev2->flags)) {
6916 if (has_journal || mddev->bitmap) {
6917 export_rdev(rdev, mddev);
6920 set_bit(Journal, &rdev->flags);
6923 * check whether the device shows up in other nodes
6925 if (mddev_is_clustered(mddev)) {
6926 if (info->state & (1 << MD_DISK_CANDIDATE))
6927 set_bit(Candidate, &rdev->flags);
6928 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6929 /* --add initiated by this node */
6930 err = md_cluster_ops->add_new_disk(mddev, rdev);
6932 export_rdev(rdev, mddev);
6938 rdev->raid_disk = -1;
6939 err = bind_rdev_to_array(rdev, mddev);
6942 export_rdev(rdev, mddev);
6944 if (mddev_is_clustered(mddev)) {
6945 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6947 err = md_cluster_ops->new_disk_ack(mddev,
6950 md_kick_rdev_from_array(rdev);
6954 md_cluster_ops->add_new_disk_cancel(mddev);
6956 err = add_bound_rdev(rdev);
6960 err = add_bound_rdev(rdev);
6965 /* otherwise, md_add_new_disk is only allowed
6966 * for major_version==0 superblocks
6968 if (mddev->major_version != 0) {
6969 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6973 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6975 rdev = md_import_device(dev, -1, 0);
6977 pr_warn("md: error, md_import_device() returned %ld\n",
6979 return PTR_ERR(rdev);
6981 rdev->desc_nr = info->number;
6982 if (info->raid_disk < mddev->raid_disks)
6983 rdev->raid_disk = info->raid_disk;
6985 rdev->raid_disk = -1;
6987 if (rdev->raid_disk < mddev->raid_disks)
6988 if (info->state & (1<<MD_DISK_SYNC))
6989 set_bit(In_sync, &rdev->flags);
6991 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6992 set_bit(WriteMostly, &rdev->flags);
6993 if (info->state & (1<<MD_DISK_FAILFAST))
6994 set_bit(FailFast, &rdev->flags);
6996 if (!mddev->persistent) {
6997 pr_debug("md: nonpersistent superblock ...\n");
6998 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
7000 rdev->sb_start = calc_dev_sboffset(rdev);
7001 rdev->sectors = rdev->sb_start;
7003 err = bind_rdev_to_array(rdev, mddev);
7005 export_rdev(rdev, mddev);
7013 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
7015 struct md_rdev *rdev;
7020 rdev = find_rdev(mddev, dev);
7024 if (rdev->raid_disk < 0)
7027 clear_bit(Blocked, &rdev->flags);
7028 remove_and_add_spares(mddev, rdev);
7030 if (rdev->raid_disk >= 0)
7034 if (mddev_is_clustered(mddev)) {
7035 if (md_cluster_ops->remove_disk(mddev, rdev))
7039 md_kick_rdev_from_array(rdev);
7040 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7042 md_wakeup_thread(mddev->thread);
7044 md_update_sb(mddev, 1);
7049 pr_debug("md: cannot remove active disk %pg from %s ...\n",
7050 rdev->bdev, mdname(mddev));
7054 static int hot_add_disk(struct mddev *mddev, dev_t dev)
7057 struct md_rdev *rdev;
7062 if (mddev->major_version != 0) {
7063 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
7067 if (!mddev->pers->hot_add_disk) {
7068 pr_warn("%s: personality does not support diskops!\n",
7073 rdev = md_import_device(dev, -1, 0);
7075 pr_warn("md: error, md_import_device() returned %ld\n",
7080 if (mddev->persistent)
7081 rdev->sb_start = calc_dev_sboffset(rdev);
7083 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
7085 rdev->sectors = rdev->sb_start;
7087 if (test_bit(Faulty, &rdev->flags)) {
7088 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
7089 rdev->bdev, mdname(mddev));
7094 clear_bit(In_sync, &rdev->flags);
7096 rdev->saved_raid_disk = -1;
7097 err = bind_rdev_to_array(rdev, mddev);
7102 * The rest should better be atomic, we can have disk failures
7103 * noticed in interrupt contexts ...
7106 rdev->raid_disk = -1;
7108 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7110 md_update_sb(mddev, 1);
7112 * If the new disk does not support REQ_NOWAIT,
7113 * disable on the whole MD.
7115 if (!bdev_nowait(rdev->bdev)) {
7116 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
7117 mdname(mddev), rdev->bdev);
7118 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
7121 * Kick recovery, maybe this spare has to be added to the
7122 * array immediately.
7124 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7125 md_wakeup_thread(mddev->thread);
7130 export_rdev(rdev, mddev);
7134 static int set_bitmap_file(struct mddev *mddev, int fd)
7139 if (!mddev->pers->quiesce || !mddev->thread)
7141 if (mddev->recovery || mddev->sync_thread)
7143 /* we should be able to change the bitmap.. */
7147 struct inode *inode;
7150 if (mddev->bitmap || mddev->bitmap_info.file)
7151 return -EEXIST; /* cannot add when bitmap is present */
7153 if (!IS_ENABLED(CONFIG_MD_BITMAP_FILE)) {
7154 pr_warn("%s: bitmap files not supported by this kernel\n",
7158 pr_warn("%s: using deprecated bitmap file support\n",
7164 pr_warn("%s: error: failed to get bitmap file\n",
7169 inode = f->f_mapping->host;
7170 if (!S_ISREG(inode->i_mode)) {
7171 pr_warn("%s: error: bitmap file must be a regular file\n",
7174 } else if (!(f->f_mode & FMODE_WRITE)) {
7175 pr_warn("%s: error: bitmap file must open for write\n",
7178 } else if (atomic_read(&inode->i_writecount) != 1) {
7179 pr_warn("%s: error: bitmap file is already in use\n",
7187 mddev->bitmap_info.file = f;
7188 mddev->bitmap_info.offset = 0; /* file overrides offset */
7189 } else if (mddev->bitmap == NULL)
7190 return -ENOENT; /* cannot remove what isn't there */
7194 struct bitmap *bitmap;
7196 bitmap = md_bitmap_create(mddev, -1);
7197 if (!IS_ERR(bitmap)) {
7198 mddev->bitmap = bitmap;
7199 err = md_bitmap_load(mddev);
7201 err = PTR_ERR(bitmap);
7203 md_bitmap_destroy(mddev);
7206 } else if (fd < 0) {
7207 md_bitmap_destroy(mddev);
7211 struct file *f = mddev->bitmap_info.file;
7213 spin_lock(&mddev->lock);
7214 mddev->bitmap_info.file = NULL;
7215 spin_unlock(&mddev->lock);
7224 * md_set_array_info is used two different ways
7225 * The original usage is when creating a new array.
7226 * In this usage, raid_disks is > 0 and it together with
7227 * level, size, not_persistent,layout,chunksize determine the
7228 * shape of the array.
7229 * This will always create an array with a type-0.90.0 superblock.
7230 * The newer usage is when assembling an array.
7231 * In this case raid_disks will be 0, and the major_version field is
7232 * use to determine which style super-blocks are to be found on the devices.
7233 * The minor and patch _version numbers are also kept incase the
7234 * super_block handler wishes to interpret them.
7236 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7238 if (info->raid_disks == 0) {
7239 /* just setting version number for superblock loading */
7240 if (info->major_version < 0 ||
7241 info->major_version >= ARRAY_SIZE(super_types) ||
7242 super_types[info->major_version].name == NULL) {
7243 /* maybe try to auto-load a module? */
7244 pr_warn("md: superblock version %d not known\n",
7245 info->major_version);
7248 mddev->major_version = info->major_version;
7249 mddev->minor_version = info->minor_version;
7250 mddev->patch_version = info->patch_version;
7251 mddev->persistent = !info->not_persistent;
7252 /* ensure mddev_put doesn't delete this now that there
7253 * is some minimal configuration.
7255 mddev->ctime = ktime_get_real_seconds();
7258 mddev->major_version = MD_MAJOR_VERSION;
7259 mddev->minor_version = MD_MINOR_VERSION;
7260 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7261 mddev->ctime = ktime_get_real_seconds();
7263 mddev->level = info->level;
7264 mddev->clevel[0] = 0;
7265 mddev->dev_sectors = 2 * (sector_t)info->size;
7266 mddev->raid_disks = info->raid_disks;
7267 /* don't set md_minor, it is determined by which /dev/md* was
7270 if (info->state & (1<<MD_SB_CLEAN))
7271 mddev->recovery_cp = MaxSector;
7273 mddev->recovery_cp = 0;
7274 mddev->persistent = ! info->not_persistent;
7275 mddev->external = 0;
7277 mddev->layout = info->layout;
7278 if (mddev->level == 0)
7279 /* Cannot trust RAID0 layout info here */
7281 mddev->chunk_sectors = info->chunk_size >> 9;
7283 if (mddev->persistent) {
7284 mddev->max_disks = MD_SB_DISKS;
7286 mddev->sb_flags = 0;
7288 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7290 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7291 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7292 mddev->bitmap_info.offset = 0;
7294 mddev->reshape_position = MaxSector;
7297 * Generate a 128 bit UUID
7299 get_random_bytes(mddev->uuid, 16);
7301 mddev->new_level = mddev->level;
7302 mddev->new_chunk_sectors = mddev->chunk_sectors;
7303 mddev->new_layout = mddev->layout;
7304 mddev->delta_disks = 0;
7305 mddev->reshape_backwards = 0;
7310 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7312 lockdep_assert_held(&mddev->reconfig_mutex);
7314 if (mddev->external_size)
7317 mddev->array_sectors = array_sectors;
7319 EXPORT_SYMBOL(md_set_array_sectors);
7321 static int update_size(struct mddev *mddev, sector_t num_sectors)
7323 struct md_rdev *rdev;
7325 int fit = (num_sectors == 0);
7326 sector_t old_dev_sectors = mddev->dev_sectors;
7328 if (mddev->pers->resize == NULL)
7330 /* The "num_sectors" is the number of sectors of each device that
7331 * is used. This can only make sense for arrays with redundancy.
7332 * linear and raid0 always use whatever space is available. We can only
7333 * consider changing this number if no resync or reconstruction is
7334 * happening, and if the new size is acceptable. It must fit before the
7335 * sb_start or, if that is <data_offset, it must fit before the size
7336 * of each device. If num_sectors is zero, we find the largest size
7339 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7342 if (!md_is_rdwr(mddev))
7345 rdev_for_each(rdev, mddev) {
7346 sector_t avail = rdev->sectors;
7348 if (fit && (num_sectors == 0 || num_sectors > avail))
7349 num_sectors = avail;
7350 if (avail < num_sectors)
7353 rv = mddev->pers->resize(mddev, num_sectors);
7355 if (mddev_is_clustered(mddev))
7356 md_cluster_ops->update_size(mddev, old_dev_sectors);
7357 else if (mddev->queue) {
7358 set_capacity_and_notify(mddev->gendisk,
7359 mddev->array_sectors);
7365 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7368 struct md_rdev *rdev;
7369 /* change the number of raid disks */
7370 if (mddev->pers->check_reshape == NULL)
7372 if (!md_is_rdwr(mddev))
7374 if (raid_disks <= 0 ||
7375 (mddev->max_disks && raid_disks >= mddev->max_disks))
7377 if (mddev->sync_thread ||
7378 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7379 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7380 mddev->reshape_position != MaxSector)
7383 rdev_for_each(rdev, mddev) {
7384 if (mddev->raid_disks < raid_disks &&
7385 rdev->data_offset < rdev->new_data_offset)
7387 if (mddev->raid_disks > raid_disks &&
7388 rdev->data_offset > rdev->new_data_offset)
7392 mddev->delta_disks = raid_disks - mddev->raid_disks;
7393 if (mddev->delta_disks < 0)
7394 mddev->reshape_backwards = 1;
7395 else if (mddev->delta_disks > 0)
7396 mddev->reshape_backwards = 0;
7398 rv = mddev->pers->check_reshape(mddev);
7400 mddev->delta_disks = 0;
7401 mddev->reshape_backwards = 0;
7407 * update_array_info is used to change the configuration of an
7409 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7410 * fields in the info are checked against the array.
7411 * Any differences that cannot be handled will cause an error.
7412 * Normally, only one change can be managed at a time.
7414 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7420 /* calculate expected state,ignoring low bits */
7421 if (mddev->bitmap && mddev->bitmap_info.offset)
7422 state |= (1 << MD_SB_BITMAP_PRESENT);
7424 if (mddev->major_version != info->major_version ||
7425 mddev->minor_version != info->minor_version ||
7426 /* mddev->patch_version != info->patch_version || */
7427 mddev->ctime != info->ctime ||
7428 mddev->level != info->level ||
7429 /* mddev->layout != info->layout || */
7430 mddev->persistent != !info->not_persistent ||
7431 mddev->chunk_sectors != info->chunk_size >> 9 ||
7432 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7433 ((state^info->state) & 0xfffffe00)
7436 /* Check there is only one change */
7437 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7439 if (mddev->raid_disks != info->raid_disks)
7441 if (mddev->layout != info->layout)
7443 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7450 if (mddev->layout != info->layout) {
7452 * we don't need to do anything at the md level, the
7453 * personality will take care of it all.
7455 if (mddev->pers->check_reshape == NULL)
7458 mddev->new_layout = info->layout;
7459 rv = mddev->pers->check_reshape(mddev);
7461 mddev->new_layout = mddev->layout;
7465 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7466 rv = update_size(mddev, (sector_t)info->size * 2);
7468 if (mddev->raid_disks != info->raid_disks)
7469 rv = update_raid_disks(mddev, info->raid_disks);
7471 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7472 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7476 if (mddev->recovery || mddev->sync_thread) {
7480 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7481 struct bitmap *bitmap;
7482 /* add the bitmap */
7483 if (mddev->bitmap) {
7487 if (mddev->bitmap_info.default_offset == 0) {
7491 mddev->bitmap_info.offset =
7492 mddev->bitmap_info.default_offset;
7493 mddev->bitmap_info.space =
7494 mddev->bitmap_info.default_space;
7495 bitmap = md_bitmap_create(mddev, -1);
7496 if (!IS_ERR(bitmap)) {
7497 mddev->bitmap = bitmap;
7498 rv = md_bitmap_load(mddev);
7500 rv = PTR_ERR(bitmap);
7502 md_bitmap_destroy(mddev);
7504 /* remove the bitmap */
7505 if (!mddev->bitmap) {
7509 if (mddev->bitmap->storage.file) {
7513 if (mddev->bitmap_info.nodes) {
7514 /* hold PW on all the bitmap lock */
7515 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7516 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7518 md_cluster_ops->unlock_all_bitmaps(mddev);
7522 mddev->bitmap_info.nodes = 0;
7523 md_cluster_ops->leave(mddev);
7524 module_put(md_cluster_mod);
7525 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7527 md_bitmap_destroy(mddev);
7528 mddev->bitmap_info.offset = 0;
7531 md_update_sb(mddev, 1);
7537 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7539 struct md_rdev *rdev;
7542 if (mddev->pers == NULL)
7546 rdev = md_find_rdev_rcu(mddev, dev);
7550 md_error(mddev, rdev);
7551 if (test_bit(MD_BROKEN, &mddev->flags))
7559 * We have a problem here : there is no easy way to give a CHS
7560 * virtual geometry. We currently pretend that we have a 2 heads
7561 * 4 sectors (with a BIG number of cylinders...). This drives
7562 * dosfs just mad... ;-)
7564 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7566 struct mddev *mddev = bdev->bd_disk->private_data;
7570 geo->cylinders = mddev->array_sectors / 8;
7574 static inline bool md_ioctl_valid(unsigned int cmd)
7578 case GET_ARRAY_INFO:
7579 case GET_BITMAP_FILE:
7582 case HOT_REMOVE_DISK:
7584 case RESTART_ARRAY_RW:
7586 case SET_ARRAY_INFO:
7587 case SET_BITMAP_FILE:
7588 case SET_DISK_FAULTY:
7591 case CLUSTERED_DISK_NACK:
7598 static bool md_ioctl_need_suspend(unsigned int cmd)
7603 case HOT_REMOVE_DISK:
7604 case SET_BITMAP_FILE:
7605 case SET_ARRAY_INFO:
7612 static int __md_set_array_info(struct mddev *mddev, void __user *argp)
7614 mdu_array_info_t info;
7618 memset(&info, 0, sizeof(info));
7619 else if (copy_from_user(&info, argp, sizeof(info)))
7623 err = update_array_info(mddev, &info);
7625 pr_warn("md: couldn't update array info. %d\n", err);
7629 if (!list_empty(&mddev->disks)) {
7630 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7634 if (mddev->raid_disks) {
7635 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7639 err = md_set_array_info(mddev, &info);
7641 pr_warn("md: couldn't set array info. %d\n", err);
7646 static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
7647 unsigned int cmd, unsigned long arg)
7650 void __user *argp = (void __user *)arg;
7651 struct mddev *mddev = NULL;
7652 bool did_set_md_closing = false;
7654 if (!md_ioctl_valid(cmd))
7659 case GET_ARRAY_INFO:
7663 if (!capable(CAP_SYS_ADMIN))
7668 * Commands dealing with the RAID driver but not any
7673 err = get_version(argp);
7679 * Commands creating/starting a new array:
7682 mddev = bdev->bd_disk->private_data;
7689 /* Some actions do not requires the mutex */
7691 case GET_ARRAY_INFO:
7692 if (!mddev->raid_disks && !mddev->external)
7695 err = get_array_info(mddev, argp);
7699 if (!mddev->raid_disks && !mddev->external)
7702 err = get_disk_info(mddev, argp);
7705 case SET_DISK_FAULTY:
7706 err = set_disk_faulty(mddev, new_decode_dev(arg));
7709 case GET_BITMAP_FILE:
7710 err = get_bitmap_file(mddev, argp);
7715 if (cmd == HOT_REMOVE_DISK)
7716 /* need to ensure recovery thread has run */
7717 wait_event_interruptible_timeout(mddev->sb_wait,
7718 !test_bit(MD_RECOVERY_NEEDED,
7720 msecs_to_jiffies(5000));
7721 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7722 /* Need to flush page cache, and ensure no-one else opens
7725 mutex_lock(&mddev->open_mutex);
7726 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7727 mutex_unlock(&mddev->open_mutex);
7731 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7732 mutex_unlock(&mddev->open_mutex);
7736 did_set_md_closing = true;
7737 mutex_unlock(&mddev->open_mutex);
7738 sync_blockdev(bdev);
7741 if (!md_is_rdwr(mddev))
7742 flush_work(&mddev->sync_work);
7744 err = md_ioctl_need_suspend(cmd) ? mddev_suspend_and_lock(mddev) :
7747 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7752 if (cmd == SET_ARRAY_INFO) {
7753 err = __md_set_array_info(mddev, argp);
7758 * Commands querying/configuring an existing array:
7760 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7761 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7762 if ((!mddev->raid_disks && !mddev->external)
7763 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7764 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7765 && cmd != GET_BITMAP_FILE) {
7771 * Commands even a read-only array can execute:
7774 case RESTART_ARRAY_RW:
7775 err = restart_array(mddev);
7779 err = do_md_stop(mddev, 0, bdev);
7783 err = md_set_readonly(mddev, bdev);
7786 case HOT_REMOVE_DISK:
7787 err = hot_remove_disk(mddev, new_decode_dev(arg));
7791 /* We can support ADD_NEW_DISK on read-only arrays
7792 * only if we are re-adding a preexisting device.
7793 * So require mddev->pers and MD_DISK_SYNC.
7796 mdu_disk_info_t info;
7797 if (copy_from_user(&info, argp, sizeof(info)))
7799 else if (!(info.state & (1<<MD_DISK_SYNC)))
7800 /* Need to clear read-only for this */
7803 err = md_add_new_disk(mddev, &info);
7810 * The remaining ioctls are changing the state of the
7811 * superblock, so we do not allow them on read-only arrays.
7813 if (!md_is_rdwr(mddev) && mddev->pers) {
7814 if (mddev->ro != MD_AUTO_READ) {
7818 mddev->ro = MD_RDWR;
7819 sysfs_notify_dirent_safe(mddev->sysfs_state);
7820 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7821 /* mddev_unlock will wake thread */
7822 /* If a device failed while we were read-only, we
7823 * need to make sure the metadata is updated now.
7825 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7826 mddev_unlock(mddev);
7827 wait_event(mddev->sb_wait,
7828 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7829 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7830 mddev_lock_nointr(mddev);
7837 mdu_disk_info_t info;
7838 if (copy_from_user(&info, argp, sizeof(info)))
7841 err = md_add_new_disk(mddev, &info);
7845 case CLUSTERED_DISK_NACK:
7846 if (mddev_is_clustered(mddev))
7847 md_cluster_ops->new_disk_ack(mddev, false);
7853 err = hot_add_disk(mddev, new_decode_dev(arg));
7857 err = do_md_run(mddev);
7860 case SET_BITMAP_FILE:
7861 err = set_bitmap_file(mddev, (int)arg);
7870 if (mddev->hold_active == UNTIL_IOCTL &&
7872 mddev->hold_active = 0;
7874 md_ioctl_need_suspend(cmd) ? mddev_unlock_and_resume(mddev) :
7875 mddev_unlock(mddev);
7878 if(did_set_md_closing)
7879 clear_bit(MD_CLOSING, &mddev->flags);
7882 #ifdef CONFIG_COMPAT
7883 static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
7884 unsigned int cmd, unsigned long arg)
7887 case HOT_REMOVE_DISK:
7889 case SET_DISK_FAULTY:
7890 case SET_BITMAP_FILE:
7891 /* These take in integer arg, do not convert */
7894 arg = (unsigned long)compat_ptr(arg);
7898 return md_ioctl(bdev, mode, cmd, arg);
7900 #endif /* CONFIG_COMPAT */
7902 static int md_set_read_only(struct block_device *bdev, bool ro)
7904 struct mddev *mddev = bdev->bd_disk->private_data;
7907 err = mddev_lock(mddev);
7911 if (!mddev->raid_disks && !mddev->external) {
7917 * Transitioning to read-auto need only happen for arrays that call
7918 * md_write_start and which are not ready for writes yet.
7920 if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
7921 err = restart_array(mddev);
7924 mddev->ro = MD_AUTO_READ;
7928 mddev_unlock(mddev);
7932 static int md_open(struct gendisk *disk, blk_mode_t mode)
7934 struct mddev *mddev;
7937 spin_lock(&all_mddevs_lock);
7938 mddev = mddev_get(disk->private_data);
7939 spin_unlock(&all_mddevs_lock);
7943 err = mutex_lock_interruptible(&mddev->open_mutex);
7948 if (test_bit(MD_CLOSING, &mddev->flags))
7951 atomic_inc(&mddev->openers);
7952 mutex_unlock(&mddev->open_mutex);
7954 disk_check_media_change(disk);
7958 mutex_unlock(&mddev->open_mutex);
7964 static void md_release(struct gendisk *disk)
7966 struct mddev *mddev = disk->private_data;
7969 atomic_dec(&mddev->openers);
7973 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7975 struct mddev *mddev = disk->private_data;
7976 unsigned int ret = 0;
7979 ret = DISK_EVENT_MEDIA_CHANGE;
7984 static void md_free_disk(struct gendisk *disk)
7986 struct mddev *mddev = disk->private_data;
7991 const struct block_device_operations md_fops =
7993 .owner = THIS_MODULE,
7994 .submit_bio = md_submit_bio,
7996 .release = md_release,
7998 #ifdef CONFIG_COMPAT
7999 .compat_ioctl = md_compat_ioctl,
8001 .getgeo = md_getgeo,
8002 .check_events = md_check_events,
8003 .set_read_only = md_set_read_only,
8004 .free_disk = md_free_disk,
8007 static int md_thread(void *arg)
8009 struct md_thread *thread = arg;
8012 * md_thread is a 'system-thread', it's priority should be very
8013 * high. We avoid resource deadlocks individually in each
8014 * raid personality. (RAID5 does preallocation) We also use RR and
8015 * the very same RT priority as kswapd, thus we will never get
8016 * into a priority inversion deadlock.
8018 * we definitely have to have equal or higher priority than
8019 * bdflush, otherwise bdflush will deadlock if there are too
8020 * many dirty RAID5 blocks.
8023 allow_signal(SIGKILL);
8024 while (!kthread_should_stop()) {
8026 /* We need to wait INTERRUPTIBLE so that
8027 * we don't add to the load-average.
8028 * That means we need to be sure no signals are
8031 if (signal_pending(current))
8032 flush_signals(current);
8034 wait_event_interruptible_timeout
8036 test_bit(THREAD_WAKEUP, &thread->flags)
8037 || kthread_should_stop() || kthread_should_park(),
8040 clear_bit(THREAD_WAKEUP, &thread->flags);
8041 if (kthread_should_park())
8043 if (!kthread_should_stop())
8044 thread->run(thread);
8050 static void md_wakeup_thread_directly(struct md_thread __rcu *thread)
8052 struct md_thread *t;
8055 t = rcu_dereference(thread);
8057 wake_up_process(t->tsk);
8061 void md_wakeup_thread(struct md_thread __rcu *thread)
8063 struct md_thread *t;
8066 t = rcu_dereference(thread);
8068 pr_debug("md: waking up MD thread %s.\n", t->tsk->comm);
8069 set_bit(THREAD_WAKEUP, &t->flags);
8070 wake_up(&t->wqueue);
8074 EXPORT_SYMBOL(md_wakeup_thread);
8076 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
8077 struct mddev *mddev, const char *name)
8079 struct md_thread *thread;
8081 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
8085 init_waitqueue_head(&thread->wqueue);
8088 thread->mddev = mddev;
8089 thread->timeout = MAX_SCHEDULE_TIMEOUT;
8090 thread->tsk = kthread_run(md_thread, thread,
8092 mdname(thread->mddev),
8094 if (IS_ERR(thread->tsk)) {
8100 EXPORT_SYMBOL(md_register_thread);
8102 void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp)
8104 struct md_thread *thread = rcu_dereference_protected(*threadp,
8105 lockdep_is_held(&mddev->reconfig_mutex));
8110 rcu_assign_pointer(*threadp, NULL);
8113 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
8114 kthread_stop(thread->tsk);
8117 EXPORT_SYMBOL(md_unregister_thread);
8119 void md_error(struct mddev *mddev, struct md_rdev *rdev)
8121 if (!rdev || test_bit(Faulty, &rdev->flags))
8124 if (!mddev->pers || !mddev->pers->error_handler)
8126 mddev->pers->error_handler(mddev, rdev);
8128 if (mddev->pers->level == 0 || mddev->pers->level == LEVEL_LINEAR)
8131 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
8132 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8133 sysfs_notify_dirent_safe(rdev->sysfs_state);
8134 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8135 if (!test_bit(MD_BROKEN, &mddev->flags)) {
8136 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8137 md_wakeup_thread(mddev->thread);
8139 if (mddev->event_work.func)
8140 queue_work(md_misc_wq, &mddev->event_work);
8143 EXPORT_SYMBOL(md_error);
8145 /* seq_file implementation /proc/mdstat */
8147 static void status_unused(struct seq_file *seq)
8150 struct md_rdev *rdev;
8152 seq_printf(seq, "unused devices: ");
8154 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8156 seq_printf(seq, "%pg ", rdev->bdev);
8159 seq_printf(seq, "<none>");
8161 seq_printf(seq, "\n");
8164 static void status_personalities(struct seq_file *seq)
8166 struct md_personality *pers;
8168 seq_puts(seq, "Personalities : ");
8169 spin_lock(&pers_lock);
8170 list_for_each_entry(pers, &pers_list, list)
8171 seq_printf(seq, "[%s] ", pers->name);
8173 spin_unlock(&pers_lock);
8174 seq_puts(seq, "\n");
8177 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8179 sector_t max_sectors, resync, res;
8180 unsigned long dt, db = 0;
8181 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8182 int scale, recovery_active;
8183 unsigned int per_milli;
8185 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8186 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8187 max_sectors = mddev->resync_max_sectors;
8189 max_sectors = mddev->dev_sectors;
8191 resync = mddev->curr_resync;
8192 if (resync < MD_RESYNC_ACTIVE) {
8193 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8194 /* Still cleaning up */
8195 resync = max_sectors;
8196 } else if (resync > max_sectors) {
8197 resync = max_sectors;
8199 res = atomic_read(&mddev->recovery_active);
8201 * Resync has started, but the subtraction has overflowed or
8202 * yielded one of the special values. Force it to active to
8203 * ensure the status reports an active resync.
8205 if (resync < res || resync - res < MD_RESYNC_ACTIVE)
8206 resync = MD_RESYNC_ACTIVE;
8211 if (resync == MD_RESYNC_NONE) {
8212 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8213 struct md_rdev *rdev;
8215 rdev_for_each(rdev, mddev)
8216 if (rdev->raid_disk >= 0 &&
8217 !test_bit(Faulty, &rdev->flags) &&
8218 rdev->recovery_offset != MaxSector &&
8219 rdev->recovery_offset) {
8220 seq_printf(seq, "\trecover=REMOTE");
8223 if (mddev->reshape_position != MaxSector)
8224 seq_printf(seq, "\treshape=REMOTE");
8226 seq_printf(seq, "\tresync=REMOTE");
8229 if (mddev->recovery_cp < MaxSector) {
8230 seq_printf(seq, "\tresync=PENDING");
8235 if (resync < MD_RESYNC_ACTIVE) {
8236 seq_printf(seq, "\tresync=DELAYED");
8240 WARN_ON(max_sectors == 0);
8241 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8242 * in a sector_t, and (max_sectors>>scale) will fit in a
8243 * u32, as those are the requirements for sector_div.
8244 * Thus 'scale' must be at least 10
8247 if (sizeof(sector_t) > sizeof(unsigned long)) {
8248 while ( max_sectors/2 > (1ULL<<(scale+32)))
8251 res = (resync>>scale)*1000;
8252 sector_div(res, (u32)((max_sectors>>scale)+1));
8256 int i, x = per_milli/50, y = 20-x;
8257 seq_printf(seq, "[");
8258 for (i = 0; i < x; i++)
8259 seq_printf(seq, "=");
8260 seq_printf(seq, ">");
8261 for (i = 0; i < y; i++)
8262 seq_printf(seq, ".");
8263 seq_printf(seq, "] ");
8265 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8266 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8268 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8270 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8271 "resync" : "recovery"))),
8272 per_milli/10, per_milli % 10,
8273 (unsigned long long) resync/2,
8274 (unsigned long long) max_sectors/2);
8277 * dt: time from mark until now
8278 * db: blocks written from mark until now
8279 * rt: remaining time
8281 * rt is a sector_t, which is always 64bit now. We are keeping
8282 * the original algorithm, but it is not really necessary.
8284 * Original algorithm:
8285 * So we divide before multiply in case it is 32bit and close
8287 * We scale the divisor (db) by 32 to avoid losing precision
8288 * near the end of resync when the number of remaining sectors
8290 * We then divide rt by 32 after multiplying by db to compensate.
8291 * The '+1' avoids division by zero if db is very small.
8293 dt = ((jiffies - mddev->resync_mark) / HZ);
8296 curr_mark_cnt = mddev->curr_mark_cnt;
8297 recovery_active = atomic_read(&mddev->recovery_active);
8298 resync_mark_cnt = mddev->resync_mark_cnt;
8300 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8301 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8303 rt = max_sectors - resync; /* number of remaining sectors */
8304 rt = div64_u64(rt, db/32+1);
8308 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8309 ((unsigned long)rt % 60)/6);
8311 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8315 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8316 __acquires(&all_mddevs_lock)
8318 seq->poll_event = atomic_read(&md_event_count);
8319 spin_lock(&all_mddevs_lock);
8321 return seq_list_start_head(&all_mddevs, *pos);
8324 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8326 return seq_list_next(v, &all_mddevs, pos);
8329 static void md_seq_stop(struct seq_file *seq, void *v)
8330 __releases(&all_mddevs_lock)
8332 spin_unlock(&all_mddevs_lock);
8335 static int md_seq_show(struct seq_file *seq, void *v)
8337 struct mddev *mddev;
8339 struct md_rdev *rdev;
8341 if (v == &all_mddevs) {
8342 status_personalities(seq);
8343 if (list_empty(&all_mddevs))
8348 mddev = list_entry(v, struct mddev, all_mddevs);
8349 if (!mddev_get(mddev))
8352 spin_unlock(&all_mddevs_lock);
8353 spin_lock(&mddev->lock);
8354 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8355 seq_printf(seq, "%s : %sactive", mdname(mddev),
8356 mddev->pers ? "" : "in");
8358 if (mddev->ro == MD_RDONLY)
8359 seq_printf(seq, " (read-only)");
8360 if (mddev->ro == MD_AUTO_READ)
8361 seq_printf(seq, " (auto-read-only)");
8362 seq_printf(seq, " %s", mddev->pers->name);
8367 rdev_for_each_rcu(rdev, mddev) {
8368 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8370 if (test_bit(WriteMostly, &rdev->flags))
8371 seq_printf(seq, "(W)");
8372 if (test_bit(Journal, &rdev->flags))
8373 seq_printf(seq, "(J)");
8374 if (test_bit(Faulty, &rdev->flags)) {
8375 seq_printf(seq, "(F)");
8378 if (rdev->raid_disk < 0)
8379 seq_printf(seq, "(S)"); /* spare */
8380 if (test_bit(Replacement, &rdev->flags))
8381 seq_printf(seq, "(R)");
8382 sectors += rdev->sectors;
8386 if (!list_empty(&mddev->disks)) {
8388 seq_printf(seq, "\n %llu blocks",
8389 (unsigned long long)
8390 mddev->array_sectors / 2);
8392 seq_printf(seq, "\n %llu blocks",
8393 (unsigned long long)sectors / 2);
8395 if (mddev->persistent) {
8396 if (mddev->major_version != 0 ||
8397 mddev->minor_version != 90) {
8398 seq_printf(seq," super %d.%d",
8399 mddev->major_version,
8400 mddev->minor_version);
8402 } else if (mddev->external)
8403 seq_printf(seq, " super external:%s",
8404 mddev->metadata_type);
8406 seq_printf(seq, " super non-persistent");
8409 mddev->pers->status(seq, mddev);
8410 seq_printf(seq, "\n ");
8411 if (mddev->pers->sync_request) {
8412 if (status_resync(seq, mddev))
8413 seq_printf(seq, "\n ");
8416 seq_printf(seq, "\n ");
8418 md_bitmap_status(seq, mddev->bitmap);
8420 seq_printf(seq, "\n");
8422 spin_unlock(&mddev->lock);
8423 spin_lock(&all_mddevs_lock);
8425 if (mddev == list_last_entry(&all_mddevs, struct mddev, all_mddevs))
8428 if (atomic_dec_and_test(&mddev->active))
8434 static const struct seq_operations md_seq_ops = {
8435 .start = md_seq_start,
8436 .next = md_seq_next,
8437 .stop = md_seq_stop,
8438 .show = md_seq_show,
8441 static int md_seq_open(struct inode *inode, struct file *file)
8443 struct seq_file *seq;
8446 error = seq_open(file, &md_seq_ops);
8450 seq = file->private_data;
8451 seq->poll_event = atomic_read(&md_event_count);
8455 static int md_unloading;
8456 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8458 struct seq_file *seq = filp->private_data;
8462 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8463 poll_wait(filp, &md_event_waiters, wait);
8465 /* always allow read */
8466 mask = EPOLLIN | EPOLLRDNORM;
8468 if (seq->poll_event != atomic_read(&md_event_count))
8469 mask |= EPOLLERR | EPOLLPRI;
8473 static const struct proc_ops mdstat_proc_ops = {
8474 .proc_open = md_seq_open,
8475 .proc_read = seq_read,
8476 .proc_lseek = seq_lseek,
8477 .proc_release = seq_release,
8478 .proc_poll = mdstat_poll,
8481 int register_md_personality(struct md_personality *p)
8483 pr_debug("md: %s personality registered for level %d\n",
8485 spin_lock(&pers_lock);
8486 list_add_tail(&p->list, &pers_list);
8487 spin_unlock(&pers_lock);
8490 EXPORT_SYMBOL(register_md_personality);
8492 int unregister_md_personality(struct md_personality *p)
8494 pr_debug("md: %s personality unregistered\n", p->name);
8495 spin_lock(&pers_lock);
8496 list_del_init(&p->list);
8497 spin_unlock(&pers_lock);
8500 EXPORT_SYMBOL(unregister_md_personality);
8502 int register_md_cluster_operations(struct md_cluster_operations *ops,
8503 struct module *module)
8506 spin_lock(&pers_lock);
8507 if (md_cluster_ops != NULL)
8510 md_cluster_ops = ops;
8511 md_cluster_mod = module;
8513 spin_unlock(&pers_lock);
8516 EXPORT_SYMBOL(register_md_cluster_operations);
8518 int unregister_md_cluster_operations(void)
8520 spin_lock(&pers_lock);
8521 md_cluster_ops = NULL;
8522 spin_unlock(&pers_lock);
8525 EXPORT_SYMBOL(unregister_md_cluster_operations);
8527 int md_setup_cluster(struct mddev *mddev, int nodes)
8530 if (!md_cluster_ops)
8531 request_module("md-cluster");
8532 spin_lock(&pers_lock);
8533 /* ensure module won't be unloaded */
8534 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8535 pr_warn("can't find md-cluster module or get its reference.\n");
8536 spin_unlock(&pers_lock);
8539 spin_unlock(&pers_lock);
8541 ret = md_cluster_ops->join(mddev, nodes);
8543 mddev->safemode_delay = 0;
8547 void md_cluster_stop(struct mddev *mddev)
8549 if (!md_cluster_ops)
8551 md_cluster_ops->leave(mddev);
8552 module_put(md_cluster_mod);
8555 static int is_mddev_idle(struct mddev *mddev, int init)
8557 struct md_rdev *rdev;
8563 rdev_for_each_rcu(rdev, mddev) {
8564 struct gendisk *disk = rdev->bdev->bd_disk;
8565 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8566 atomic_read(&disk->sync_io);
8567 /* sync IO will cause sync_io to increase before the disk_stats
8568 * as sync_io is counted when a request starts, and
8569 * disk_stats is counted when it completes.
8570 * So resync activity will cause curr_events to be smaller than
8571 * when there was no such activity.
8572 * non-sync IO will cause disk_stat to increase without
8573 * increasing sync_io so curr_events will (eventually)
8574 * be larger than it was before. Once it becomes
8575 * substantially larger, the test below will cause
8576 * the array to appear non-idle, and resync will slow
8578 * If there is a lot of outstanding resync activity when
8579 * we set last_event to curr_events, then all that activity
8580 * completing might cause the array to appear non-idle
8581 * and resync will be slowed down even though there might
8582 * not have been non-resync activity. This will only
8583 * happen once though. 'last_events' will soon reflect
8584 * the state where there is little or no outstanding
8585 * resync requests, and further resync activity will
8586 * always make curr_events less than last_events.
8589 if (init || curr_events - rdev->last_events > 64) {
8590 rdev->last_events = curr_events;
8598 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8600 /* another "blocks" (512byte) blocks have been synced */
8601 atomic_sub(blocks, &mddev->recovery_active);
8602 wake_up(&mddev->recovery_wait);
8604 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8605 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8606 md_wakeup_thread(mddev->thread);
8607 // stop recovery, signal do_sync ....
8610 EXPORT_SYMBOL(md_done_sync);
8612 /* md_write_start(mddev, bi)
8613 * If we need to update some array metadata (e.g. 'active' flag
8614 * in superblock) before writing, schedule a superblock update
8615 * and wait for it to complete.
8616 * A return value of 'false' means that the write wasn't recorded
8617 * and cannot proceed as the array is being suspend.
8619 bool md_write_start(struct mddev *mddev, struct bio *bi)
8623 if (bio_data_dir(bi) != WRITE)
8626 BUG_ON(mddev->ro == MD_RDONLY);
8627 if (mddev->ro == MD_AUTO_READ) {
8628 /* need to switch to read/write */
8629 flush_work(&mddev->sync_work);
8630 mddev->ro = MD_RDWR;
8631 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8632 md_wakeup_thread(mddev->thread);
8633 md_wakeup_thread(mddev->sync_thread);
8637 percpu_ref_get(&mddev->writes_pending);
8638 smp_mb(); /* Match smp_mb in set_in_sync() */
8639 if (mddev->safemode == 1)
8640 mddev->safemode = 0;
8641 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8642 if (mddev->in_sync || mddev->sync_checkers) {
8643 spin_lock(&mddev->lock);
8644 if (mddev->in_sync) {
8646 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8647 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8648 md_wakeup_thread(mddev->thread);
8651 spin_unlock(&mddev->lock);
8655 sysfs_notify_dirent_safe(mddev->sysfs_state);
8656 if (!mddev->has_superblocks)
8658 wait_event(mddev->sb_wait,
8659 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8660 is_md_suspended(mddev));
8661 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8662 percpu_ref_put(&mddev->writes_pending);
8667 EXPORT_SYMBOL(md_write_start);
8669 /* md_write_inc can only be called when md_write_start() has
8670 * already been called at least once of the current request.
8671 * It increments the counter and is useful when a single request
8672 * is split into several parts. Each part causes an increment and
8673 * so needs a matching md_write_end().
8674 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8675 * a spinlocked region.
8677 void md_write_inc(struct mddev *mddev, struct bio *bi)
8679 if (bio_data_dir(bi) != WRITE)
8681 WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
8682 percpu_ref_get(&mddev->writes_pending);
8684 EXPORT_SYMBOL(md_write_inc);
8686 void md_write_end(struct mddev *mddev)
8688 percpu_ref_put(&mddev->writes_pending);
8690 if (mddev->safemode == 2)
8691 md_wakeup_thread(mddev->thread);
8692 else if (mddev->safemode_delay)
8693 /* The roundup() ensures this only performs locking once
8694 * every ->safemode_delay jiffies
8696 mod_timer(&mddev->safemode_timer,
8697 roundup(jiffies, mddev->safemode_delay) +
8698 mddev->safemode_delay);
8701 EXPORT_SYMBOL(md_write_end);
8703 /* This is used by raid0 and raid10 */
8704 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8705 struct bio *bio, sector_t start, sector_t size)
8707 struct bio *discard_bio = NULL;
8709 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8710 &discard_bio) || !discard_bio)
8713 bio_chain(discard_bio, bio);
8714 bio_clone_blkg_association(discard_bio, bio);
8716 trace_block_bio_remap(discard_bio,
8717 disk_devt(mddev->gendisk),
8718 bio->bi_iter.bi_sector);
8719 submit_bio_noacct(discard_bio);
8721 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8723 static void md_end_clone_io(struct bio *bio)
8725 struct md_io_clone *md_io_clone = bio->bi_private;
8726 struct bio *orig_bio = md_io_clone->orig_bio;
8727 struct mddev *mddev = md_io_clone->mddev;
8729 if (bio->bi_status && !orig_bio->bi_status)
8730 orig_bio->bi_status = bio->bi_status;
8732 if (md_io_clone->start_time)
8733 bio_end_io_acct(orig_bio, md_io_clone->start_time);
8736 bio_endio(orig_bio);
8737 percpu_ref_put(&mddev->active_io);
8740 static void md_clone_bio(struct mddev *mddev, struct bio **bio)
8742 struct block_device *bdev = (*bio)->bi_bdev;
8743 struct md_io_clone *md_io_clone;
8745 bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_clone_set);
8747 md_io_clone = container_of(clone, struct md_io_clone, bio_clone);
8748 md_io_clone->orig_bio = *bio;
8749 md_io_clone->mddev = mddev;
8750 if (blk_queue_io_stat(bdev->bd_disk->queue))
8751 md_io_clone->start_time = bio_start_io_acct(*bio);
8753 clone->bi_end_io = md_end_clone_io;
8754 clone->bi_private = md_io_clone;
8758 void md_account_bio(struct mddev *mddev, struct bio **bio)
8760 percpu_ref_get(&mddev->active_io);
8761 md_clone_bio(mddev, bio);
8763 EXPORT_SYMBOL_GPL(md_account_bio);
8765 /* md_allow_write(mddev)
8766 * Calling this ensures that the array is marked 'active' so that writes
8767 * may proceed without blocking. It is important to call this before
8768 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8769 * Must be called with mddev_lock held.
8771 void md_allow_write(struct mddev *mddev)
8775 if (!md_is_rdwr(mddev))
8777 if (!mddev->pers->sync_request)
8780 spin_lock(&mddev->lock);
8781 if (mddev->in_sync) {
8783 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8784 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8785 if (mddev->safemode_delay &&
8786 mddev->safemode == 0)
8787 mddev->safemode = 1;
8788 spin_unlock(&mddev->lock);
8789 md_update_sb(mddev, 0);
8790 sysfs_notify_dirent_safe(mddev->sysfs_state);
8791 /* wait for the dirty state to be recorded in the metadata */
8792 wait_event(mddev->sb_wait,
8793 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8795 spin_unlock(&mddev->lock);
8797 EXPORT_SYMBOL_GPL(md_allow_write);
8799 #define SYNC_MARKS 10
8800 #define SYNC_MARK_STEP (3*HZ)
8801 #define UPDATE_FREQUENCY (5*60*HZ)
8802 void md_do_sync(struct md_thread *thread)
8804 struct mddev *mddev = thread->mddev;
8805 struct mddev *mddev2;
8806 unsigned int currspeed = 0, window;
8807 sector_t max_sectors,j, io_sectors, recovery_done;
8808 unsigned long mark[SYNC_MARKS];
8809 unsigned long update_time;
8810 sector_t mark_cnt[SYNC_MARKS];
8812 sector_t last_check;
8814 struct md_rdev *rdev;
8815 char *desc, *action = NULL;
8816 struct blk_plug plug;
8819 /* just incase thread restarts... */
8820 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8823 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8826 if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) ||
8827 !md_is_rdwr(mddev)) {/* never try to sync a read-only array */
8828 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8832 if (mddev_is_clustered(mddev)) {
8833 ret = md_cluster_ops->resync_start(mddev);
8837 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8838 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8839 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8840 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8841 && ((unsigned long long)mddev->curr_resync_completed
8842 < (unsigned long long)mddev->resync_max_sectors))
8846 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8847 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8848 desc = "data-check";
8850 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8851 desc = "requested-resync";
8855 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8860 mddev->last_sync_action = action ?: desc;
8863 * Before starting a resync we must have set curr_resync to
8864 * 2, and then checked that every "conflicting" array has curr_resync
8865 * less than ours. When we find one that is the same or higher
8866 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8867 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8868 * This will mean we have to start checking from the beginning again.
8873 int mddev2_minor = -1;
8874 mddev->curr_resync = MD_RESYNC_DELAYED;
8877 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8879 spin_lock(&all_mddevs_lock);
8880 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) {
8881 if (test_bit(MD_DELETED, &mddev2->flags))
8883 if (mddev2 == mddev)
8885 if (!mddev->parallel_resync
8886 && mddev2->curr_resync
8887 && match_mddev_units(mddev, mddev2)) {
8889 if (mddev < mddev2 &&
8890 mddev->curr_resync == MD_RESYNC_DELAYED) {
8891 /* arbitrarily yield */
8892 mddev->curr_resync = MD_RESYNC_YIELDED;
8893 wake_up(&resync_wait);
8895 if (mddev > mddev2 &&
8896 mddev->curr_resync == MD_RESYNC_YIELDED)
8897 /* no need to wait here, we can wait the next
8898 * time 'round when curr_resync == 2
8901 /* We need to wait 'interruptible' so as not to
8902 * contribute to the load average, and not to
8903 * be caught by 'softlockup'
8905 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8906 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8907 mddev2->curr_resync >= mddev->curr_resync) {
8908 if (mddev2_minor != mddev2->md_minor) {
8909 mddev2_minor = mddev2->md_minor;
8910 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8911 desc, mdname(mddev),
8914 spin_unlock(&all_mddevs_lock);
8916 if (signal_pending(current))
8917 flush_signals(current);
8919 finish_wait(&resync_wait, &wq);
8922 finish_wait(&resync_wait, &wq);
8925 spin_unlock(&all_mddevs_lock);
8926 } while (mddev->curr_resync < MD_RESYNC_DELAYED);
8929 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8930 /* resync follows the size requested by the personality,
8931 * which defaults to physical size, but can be virtual size
8933 max_sectors = mddev->resync_max_sectors;
8934 atomic64_set(&mddev->resync_mismatches, 0);
8935 /* we don't use the checkpoint if there's a bitmap */
8936 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8937 j = mddev->resync_min;
8938 else if (!mddev->bitmap)
8939 j = mddev->recovery_cp;
8941 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8942 max_sectors = mddev->resync_max_sectors;
8944 * If the original node aborts reshaping then we continue the
8945 * reshaping, so set j again to avoid restart reshape from the
8948 if (mddev_is_clustered(mddev) &&
8949 mddev->reshape_position != MaxSector)
8950 j = mddev->reshape_position;
8952 /* recovery follows the physical size of devices */
8953 max_sectors = mddev->dev_sectors;
8956 rdev_for_each_rcu(rdev, mddev)
8957 if (rdev->raid_disk >= 0 &&
8958 !test_bit(Journal, &rdev->flags) &&
8959 !test_bit(Faulty, &rdev->flags) &&
8960 !test_bit(In_sync, &rdev->flags) &&
8961 rdev->recovery_offset < j)
8962 j = rdev->recovery_offset;
8965 /* If there is a bitmap, we need to make sure all
8966 * writes that started before we added a spare
8967 * complete before we start doing a recovery.
8968 * Otherwise the write might complete and (via
8969 * bitmap_endwrite) set a bit in the bitmap after the
8970 * recovery has checked that bit and skipped that
8973 if (mddev->bitmap) {
8974 mddev->pers->quiesce(mddev, 1);
8975 mddev->pers->quiesce(mddev, 0);
8979 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8980 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8981 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8982 speed_max(mddev), desc);
8984 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8987 for (m = 0; m < SYNC_MARKS; m++) {
8989 mark_cnt[m] = io_sectors;
8992 mddev->resync_mark = mark[last_mark];
8993 mddev->resync_mark_cnt = mark_cnt[last_mark];
8996 * Tune reconstruction:
8998 window = 32 * (PAGE_SIZE / 512);
8999 pr_debug("md: using %dk window, over a total of %lluk.\n",
9000 window/2, (unsigned long long)max_sectors/2);
9002 atomic_set(&mddev->recovery_active, 0);
9005 if (j >= MD_RESYNC_ACTIVE) {
9006 pr_debug("md: resuming %s of %s from checkpoint.\n",
9007 desc, mdname(mddev));
9008 mddev->curr_resync = j;
9010 mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */
9011 mddev->curr_resync_completed = j;
9012 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9014 update_time = jiffies;
9016 blk_start_plug(&plug);
9017 while (j < max_sectors) {
9022 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9023 ((mddev->curr_resync > mddev->curr_resync_completed &&
9024 (mddev->curr_resync - mddev->curr_resync_completed)
9025 > (max_sectors >> 4)) ||
9026 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
9027 (j - mddev->curr_resync_completed)*2
9028 >= mddev->resync_max - mddev->curr_resync_completed ||
9029 mddev->curr_resync_completed > mddev->resync_max
9031 /* time to update curr_resync_completed */
9032 wait_event(mddev->recovery_wait,
9033 atomic_read(&mddev->recovery_active) == 0);
9034 mddev->curr_resync_completed = j;
9035 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
9036 j > mddev->recovery_cp)
9037 mddev->recovery_cp = j;
9038 update_time = jiffies;
9039 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
9040 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9043 while (j >= mddev->resync_max &&
9044 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9045 /* As this condition is controlled by user-space,
9046 * we can block indefinitely, so use '_interruptible'
9047 * to avoid triggering warnings.
9049 flush_signals(current); /* just in case */
9050 wait_event_interruptible(mddev->recovery_wait,
9051 mddev->resync_max > j
9052 || test_bit(MD_RECOVERY_INTR,
9056 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9059 sectors = mddev->pers->sync_request(mddev, j, &skipped);
9061 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9065 if (!skipped) { /* actual IO requested */
9066 io_sectors += sectors;
9067 atomic_add(sectors, &mddev->recovery_active);
9070 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9074 if (j > max_sectors)
9075 /* when skipping, extra large numbers can be returned. */
9077 if (j >= MD_RESYNC_ACTIVE)
9078 mddev->curr_resync = j;
9079 mddev->curr_mark_cnt = io_sectors;
9080 if (last_check == 0)
9081 /* this is the earliest that rebuild will be
9082 * visible in /proc/mdstat
9086 if (last_check + window > io_sectors || j == max_sectors)
9089 last_check = io_sectors;
9091 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
9093 int next = (last_mark+1) % SYNC_MARKS;
9095 mddev->resync_mark = mark[next];
9096 mddev->resync_mark_cnt = mark_cnt[next];
9097 mark[next] = jiffies;
9098 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
9102 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9106 * this loop exits only if either when we are slower than
9107 * the 'hard' speed limit, or the system was IO-idle for
9109 * the system might be non-idle CPU-wise, but we only care
9110 * about not overloading the IO subsystem. (things like an
9111 * e2fsck being done on the RAID array should execute fast)
9115 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9116 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9117 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9119 if (currspeed > speed_min(mddev)) {
9120 if (currspeed > speed_max(mddev)) {
9124 if (!is_mddev_idle(mddev, 0)) {
9126 * Give other IO more of a chance.
9127 * The faster the devices, the less we wait.
9129 wait_event(mddev->recovery_wait,
9130 !atomic_read(&mddev->recovery_active));
9134 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9135 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9136 ? "interrupted" : "done");
9138 * this also signals 'finished resyncing' to md_stop
9140 blk_finish_plug(&plug);
9141 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9143 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9144 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9145 mddev->curr_resync >= MD_RESYNC_ACTIVE) {
9146 mddev->curr_resync_completed = mddev->curr_resync;
9147 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9149 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9151 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9152 mddev->curr_resync > MD_RESYNC_ACTIVE) {
9153 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9154 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9155 if (mddev->curr_resync >= mddev->recovery_cp) {
9156 pr_debug("md: checkpointing %s of %s.\n",
9157 desc, mdname(mddev));
9158 if (test_bit(MD_RECOVERY_ERROR,
9160 mddev->recovery_cp =
9161 mddev->curr_resync_completed;
9163 mddev->recovery_cp =
9167 mddev->recovery_cp = MaxSector;
9169 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9170 mddev->curr_resync = MaxSector;
9171 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9172 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9174 rdev_for_each_rcu(rdev, mddev)
9175 if (rdev->raid_disk >= 0 &&
9176 mddev->delta_disks >= 0 &&
9177 !test_bit(Journal, &rdev->flags) &&
9178 !test_bit(Faulty, &rdev->flags) &&
9179 !test_bit(In_sync, &rdev->flags) &&
9180 rdev->recovery_offset < mddev->curr_resync)
9181 rdev->recovery_offset = mddev->curr_resync;
9187 /* set CHANGE_PENDING here since maybe another update is needed,
9188 * so other nodes are informed. It should be harmless for normal
9190 set_mask_bits(&mddev->sb_flags, 0,
9191 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9193 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9194 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9195 mddev->delta_disks > 0 &&
9196 mddev->pers->finish_reshape &&
9197 mddev->pers->size &&
9199 mddev_lock_nointr(mddev);
9200 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9201 mddev_unlock(mddev);
9202 if (!mddev_is_clustered(mddev))
9203 set_capacity_and_notify(mddev->gendisk,
9204 mddev->array_sectors);
9207 spin_lock(&mddev->lock);
9208 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9209 /* We completed so min/max setting can be forgotten if used. */
9210 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9211 mddev->resync_min = 0;
9212 mddev->resync_max = MaxSector;
9213 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9214 mddev->resync_min = mddev->curr_resync_completed;
9215 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9216 mddev->curr_resync = MD_RESYNC_NONE;
9217 spin_unlock(&mddev->lock);
9219 wake_up(&resync_wait);
9220 md_wakeup_thread(mddev->thread);
9223 EXPORT_SYMBOL_GPL(md_do_sync);
9225 static bool rdev_removeable(struct md_rdev *rdev)
9227 /* rdev is not used. */
9228 if (rdev->raid_disk < 0)
9231 /* There are still inflight io, don't remove this rdev. */
9232 if (atomic_read(&rdev->nr_pending))
9236 * An error occurred but has not yet been acknowledged by the metadata
9237 * handler, don't remove this rdev.
9239 if (test_bit(Blocked, &rdev->flags))
9242 /* Fautly rdev is not used, it's safe to remove it. */
9243 if (test_bit(Faulty, &rdev->flags))
9246 /* Journal disk can only be removed if it's faulty. */
9247 if (test_bit(Journal, &rdev->flags))
9251 * 'In_sync' is cleared while 'raid_disk' is valid, which means
9252 * replacement has just become active from pers->spare_active(), and
9253 * then pers->hot_remove_disk() will replace this rdev with replacement.
9255 if (!test_bit(In_sync, &rdev->flags))
9261 static bool rdev_is_spare(struct md_rdev *rdev)
9263 return !test_bit(Candidate, &rdev->flags) && rdev->raid_disk >= 0 &&
9264 !test_bit(In_sync, &rdev->flags) &&
9265 !test_bit(Journal, &rdev->flags) &&
9266 !test_bit(Faulty, &rdev->flags);
9269 static bool rdev_addable(struct md_rdev *rdev)
9271 /* rdev is already used, don't add it again. */
9272 if (test_bit(Candidate, &rdev->flags) || rdev->raid_disk >= 0 ||
9273 test_bit(Faulty, &rdev->flags))
9276 /* Allow to add journal disk. */
9277 if (test_bit(Journal, &rdev->flags))
9280 /* Allow to add if array is read-write. */
9281 if (md_is_rdwr(rdev->mddev))
9285 * For read-only array, only allow to readd a rdev. And if bitmap is
9286 * used, don't allow to readd a rdev that is too old.
9288 if (rdev->saved_raid_disk >= 0 && !test_bit(Bitmap_sync, &rdev->flags))
9294 static bool md_spares_need_change(struct mddev *mddev)
9296 struct md_rdev *rdev;
9298 rdev_for_each(rdev, mddev)
9299 if (rdev_removeable(rdev) || rdev_addable(rdev))
9304 static int remove_and_add_spares(struct mddev *mddev,
9305 struct md_rdev *this)
9307 struct md_rdev *rdev;
9310 bool remove_some = false;
9312 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9313 /* Mustn't remove devices when resync thread is running */
9316 rdev_for_each(rdev, mddev) {
9317 if ((this == NULL || rdev == this) &&
9318 rdev->raid_disk >= 0 &&
9319 !test_bit(Blocked, &rdev->flags) &&
9320 test_bit(Faulty, &rdev->flags) &&
9321 atomic_read(&rdev->nr_pending)==0) {
9322 /* Faulty non-Blocked devices with nr_pending == 0
9323 * never get nr_pending incremented,
9324 * never get Faulty cleared, and never get Blocked set.
9325 * So we can synchronize_rcu now rather than once per device
9328 set_bit(RemoveSynchronized, &rdev->flags);
9334 rdev_for_each(rdev, mddev) {
9335 if ((this == NULL || rdev == this) &&
9336 (test_bit(RemoveSynchronized, &rdev->flags) ||
9337 rdev_removeable(rdev))) {
9338 if (mddev->pers->hot_remove_disk(
9339 mddev, rdev) == 0) {
9340 sysfs_unlink_rdev(mddev, rdev);
9341 rdev->saved_raid_disk = rdev->raid_disk;
9342 rdev->raid_disk = -1;
9346 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9347 clear_bit(RemoveSynchronized, &rdev->flags);
9350 if (removed && mddev->kobj.sd)
9351 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9353 if (this && removed)
9356 rdev_for_each(rdev, mddev) {
9357 if (this && this != rdev)
9359 if (rdev_is_spare(rdev))
9361 if (!rdev_addable(rdev))
9363 if (!test_bit(Journal, &rdev->flags))
9364 rdev->recovery_offset = 0;
9365 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9366 /* failure here is OK */
9367 sysfs_link_rdev(mddev, rdev);
9368 if (!test_bit(Journal, &rdev->flags))
9371 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9376 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9380 static bool md_choose_sync_action(struct mddev *mddev, int *spares)
9382 /* Check if reshape is in progress first. */
9383 if (mddev->reshape_position != MaxSector) {
9384 if (mddev->pers->check_reshape == NULL ||
9385 mddev->pers->check_reshape(mddev) != 0)
9388 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9389 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9394 * Remove any failed drives, then add spares if possible. Spares are
9395 * also removed and re-added, to allow the personality to fail the
9398 *spares = remove_and_add_spares(mddev, NULL);
9400 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9401 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9402 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9404 /* Start new recovery. */
9405 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9409 /* Check if recovery is in progress. */
9410 if (mddev->recovery_cp < MaxSector) {
9411 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9412 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9416 /* Delay to choose resync/check/repair in md_do_sync(). */
9417 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9420 /* Nothing to be done */
9424 static void md_start_sync(struct work_struct *ws)
9426 struct mddev *mddev = container_of(ws, struct mddev, sync_work);
9428 bool suspend = false;
9432 * If reshape is still in progress, spares won't be added or removed
9433 * from conf until reshape is done.
9435 if (mddev->reshape_position == MaxSector &&
9436 md_spares_need_change(mddev)) {
9438 mddev_suspend(mddev, false);
9441 mddev_lock_nointr(mddev);
9442 if (!md_is_rdwr(mddev)) {
9444 * On a read-only array we can:
9445 * - remove failed devices
9446 * - add already-in_sync devices if the array itself is in-sync.
9447 * As we only add devices that are already in-sync, we can
9448 * activate the spares immediately.
9450 remove_and_add_spares(mddev, NULL);
9454 if (!md_choose_sync_action(mddev, &spares))
9457 if (!mddev->pers->sync_request)
9461 * We are adding a device or devices to an array which has the bitmap
9462 * stored on all devices. So make sure all bitmap pages get written.
9465 md_bitmap_write_all(mddev->bitmap);
9467 name = test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ?
9468 "reshape" : "resync";
9469 rcu_assign_pointer(mddev->sync_thread,
9470 md_register_thread(md_do_sync, mddev, name));
9471 if (!mddev->sync_thread) {
9472 pr_warn("%s: could not start resync thread...\n",
9474 /* leave the spares where they are, it shouldn't hurt */
9478 mddev_unlock(mddev);
9480 * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should
9481 * not set it again. Otherwise, we may cause issue like this one:
9482 * https://bugzilla.kernel.org/show_bug.cgi?id=218200
9483 * Therefore, use __mddev_resume(mddev, false).
9486 __mddev_resume(mddev, false);
9487 md_wakeup_thread(mddev->sync_thread);
9488 sysfs_notify_dirent_safe(mddev->sysfs_action);
9493 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9494 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9495 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9496 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9497 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9498 mddev_unlock(mddev);
9500 * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should
9501 * not set it again. Otherwise, we may cause issue like this one:
9502 * https://bugzilla.kernel.org/show_bug.cgi?id=218200
9503 * Therefore, use __mddev_resume(mddev, false).
9506 __mddev_resume(mddev, false);
9508 wake_up(&resync_wait);
9509 if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
9510 mddev->sysfs_action)
9511 sysfs_notify_dirent_safe(mddev->sysfs_action);
9514 static void unregister_sync_thread(struct mddev *mddev)
9516 if (!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9517 /* resync/recovery still happening */
9518 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9522 if (WARN_ON_ONCE(!mddev->sync_thread))
9525 md_reap_sync_thread(mddev);
9529 * This routine is regularly called by all per-raid-array threads to
9530 * deal with generic issues like resync and super-block update.
9531 * Raid personalities that don't have a thread (linear/raid0) do not
9532 * need this as they never do any recovery or update the superblock.
9534 * It does not do any resync itself, but rather "forks" off other threads
9535 * to do that as needed.
9536 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9537 * "->recovery" and create a thread at ->sync_thread.
9538 * When the thread finishes it sets MD_RECOVERY_DONE
9539 * and wakeups up this thread which will reap the thread and finish up.
9540 * This thread also removes any faulty devices (with nr_pending == 0).
9542 * The overall approach is:
9543 * 1/ if the superblock needs updating, update it.
9544 * 2/ If a recovery thread is running, don't do anything else.
9545 * 3/ If recovery has finished, clean up, possibly marking spares active.
9546 * 4/ If there are any faulty devices, remove them.
9547 * 5/ If array is degraded, try to add spares devices
9548 * 6/ If array has spares or is not in-sync, start a resync thread.
9550 void md_check_recovery(struct mddev *mddev)
9553 md_bitmap_daemon_work(mddev);
9555 if (signal_pending(current)) {
9556 if (mddev->pers->sync_request && !mddev->external) {
9557 pr_debug("md: %s in immediate safe mode\n",
9559 mddev->safemode = 2;
9561 flush_signals(current);
9564 if (!md_is_rdwr(mddev) &&
9565 !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) &&
9566 !test_bit(MD_RECOVERY_DONE, &mddev->recovery))
9569 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9570 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9571 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9572 (mddev->external == 0 && mddev->safemode == 1) ||
9573 (mddev->safemode == 2
9574 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9578 if (mddev_trylock(mddev)) {
9579 bool try_set_sync = mddev->safemode != 0;
9581 if (!mddev->external && mddev->safemode == 1)
9582 mddev->safemode = 0;
9584 if (!md_is_rdwr(mddev)) {
9585 struct md_rdev *rdev;
9587 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9588 unregister_sync_thread(mddev);
9592 if (!mddev->external && mddev->in_sync)
9594 * 'Blocked' flag not needed as failed devices
9595 * will be recorded if array switched to read/write.
9596 * Leaving it set will prevent the device
9597 * from being removed.
9599 rdev_for_each(rdev, mddev)
9600 clear_bit(Blocked, &rdev->flags);
9603 * There is no thread, but we need to call
9604 * ->spare_active and clear saved_raid_disk
9606 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9607 md_reap_sync_thread(mddev);
9610 * Let md_start_sync() to remove and add rdevs to the
9613 if (md_spares_need_change(mddev)) {
9614 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9615 queue_work(md_misc_wq, &mddev->sync_work);
9618 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9619 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9620 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9625 if (mddev_is_clustered(mddev)) {
9626 struct md_rdev *rdev, *tmp;
9627 /* kick the device if another node issued a
9630 rdev_for_each_safe(rdev, tmp, mddev) {
9631 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9632 rdev->raid_disk < 0)
9633 md_kick_rdev_from_array(rdev);
9637 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9638 spin_lock(&mddev->lock);
9640 spin_unlock(&mddev->lock);
9643 if (mddev->sb_flags)
9644 md_update_sb(mddev, 0);
9647 * Never start a new sync thread if MD_RECOVERY_RUNNING is
9650 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9651 unregister_sync_thread(mddev);
9655 /* Set RUNNING before clearing NEEDED to avoid
9656 * any transients in the value of "sync_action".
9658 mddev->curr_resync_completed = 0;
9659 spin_lock(&mddev->lock);
9660 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9661 spin_unlock(&mddev->lock);
9662 /* Clear some bits that don't mean anything, but
9665 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9666 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9668 if (test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) &&
9669 !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
9670 queue_work(md_misc_wq, &mddev->sync_work);
9672 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9673 wake_up(&resync_wait);
9677 wake_up(&mddev->sb_wait);
9678 mddev_unlock(mddev);
9681 EXPORT_SYMBOL(md_check_recovery);
9683 void md_reap_sync_thread(struct mddev *mddev)
9685 struct md_rdev *rdev;
9686 sector_t old_dev_sectors = mddev->dev_sectors;
9687 bool is_reshaped = false;
9689 /* resync has finished, collect result */
9690 md_unregister_thread(mddev, &mddev->sync_thread);
9691 atomic_inc(&mddev->sync_seq);
9693 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9694 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9695 mddev->degraded != mddev->raid_disks) {
9697 /* activate any spares */
9698 if (mddev->pers->spare_active(mddev)) {
9699 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9700 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9703 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9704 mddev->pers->finish_reshape) {
9705 mddev->pers->finish_reshape(mddev);
9706 if (mddev_is_clustered(mddev))
9710 /* If array is no-longer degraded, then any saved_raid_disk
9711 * information must be scrapped.
9713 if (!mddev->degraded)
9714 rdev_for_each(rdev, mddev)
9715 rdev->saved_raid_disk = -1;
9717 md_update_sb(mddev, 1);
9718 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9719 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9721 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9722 md_cluster_ops->resync_finish(mddev);
9723 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9724 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9725 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9726 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9727 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9728 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9730 * We call md_cluster_ops->update_size here because sync_size could
9731 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9732 * so it is time to update size across cluster.
9734 if (mddev_is_clustered(mddev) && is_reshaped
9735 && !test_bit(MD_CLOSING, &mddev->flags))
9736 md_cluster_ops->update_size(mddev, old_dev_sectors);
9737 /* flag recovery needed just to double check */
9738 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9739 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9740 sysfs_notify_dirent_safe(mddev->sysfs_action);
9742 if (mddev->event_work.func)
9743 queue_work(md_misc_wq, &mddev->event_work);
9744 wake_up(&resync_wait);
9746 EXPORT_SYMBOL(md_reap_sync_thread);
9748 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9750 sysfs_notify_dirent_safe(rdev->sysfs_state);
9751 wait_event_timeout(rdev->blocked_wait,
9752 !test_bit(Blocked, &rdev->flags) &&
9753 !test_bit(BlockedBadBlocks, &rdev->flags),
9754 msecs_to_jiffies(5000));
9755 rdev_dec_pending(rdev, mddev);
9757 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9759 void md_finish_reshape(struct mddev *mddev)
9761 /* called be personality module when reshape completes. */
9762 struct md_rdev *rdev;
9764 rdev_for_each(rdev, mddev) {
9765 if (rdev->data_offset > rdev->new_data_offset)
9766 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9768 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9769 rdev->data_offset = rdev->new_data_offset;
9772 EXPORT_SYMBOL(md_finish_reshape);
9774 /* Bad block management */
9776 /* Returns 1 on success, 0 on failure */
9777 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9780 struct mddev *mddev = rdev->mddev;
9783 s += rdev->new_data_offset;
9785 s += rdev->data_offset;
9786 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9788 /* Make sure they get written out promptly */
9789 if (test_bit(ExternalBbl, &rdev->flags))
9790 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9791 sysfs_notify_dirent_safe(rdev->sysfs_state);
9792 set_mask_bits(&mddev->sb_flags, 0,
9793 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9794 md_wakeup_thread(rdev->mddev->thread);
9799 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9801 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9806 s += rdev->new_data_offset;
9808 s += rdev->data_offset;
9809 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9810 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9811 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9814 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9816 static int md_notify_reboot(struct notifier_block *this,
9817 unsigned long code, void *x)
9819 struct mddev *mddev, *n;
9822 spin_lock(&all_mddevs_lock);
9823 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9824 if (!mddev_get(mddev))
9826 spin_unlock(&all_mddevs_lock);
9827 if (mddev_trylock(mddev)) {
9829 __md_stop_writes(mddev);
9830 if (mddev->persistent)
9831 mddev->safemode = 2;
9832 mddev_unlock(mddev);
9836 spin_lock(&all_mddevs_lock);
9838 spin_unlock(&all_mddevs_lock);
9841 * certain more exotic SCSI devices are known to be
9842 * volatile wrt too early system reboots. While the
9843 * right place to handle this issue is the given
9844 * driver, we do want to have a safe RAID driver ...
9852 static struct notifier_block md_notifier = {
9853 .notifier_call = md_notify_reboot,
9855 .priority = INT_MAX, /* before any real devices */
9858 static void md_geninit(void)
9860 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9862 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9865 static int __init md_init(void)
9869 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9873 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9877 md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND,
9882 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9886 ret = __register_blkdev(0, "mdp", md_probe);
9891 register_reboot_notifier(&md_notifier);
9892 raid_table_header = register_sysctl("dev/raid", raid_table);
9898 unregister_blkdev(MD_MAJOR, "md");
9900 destroy_workqueue(md_bitmap_wq);
9902 destroy_workqueue(md_misc_wq);
9904 destroy_workqueue(md_wq);
9909 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9911 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9912 struct md_rdev *rdev2, *tmp;
9916 * If size is changed in another node then we need to
9917 * do resize as well.
9919 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9920 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9922 pr_info("md-cluster: resize failed\n");
9924 md_bitmap_update_sb(mddev->bitmap);
9927 /* Check for change of roles in the active devices */
9928 rdev_for_each_safe(rdev2, tmp, mddev) {
9929 if (test_bit(Faulty, &rdev2->flags))
9932 /* Check if the roles changed */
9933 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9935 if (test_bit(Candidate, &rdev2->flags)) {
9936 if (role == MD_DISK_ROLE_FAULTY) {
9937 pr_info("md: Removing Candidate device %pg because add failed\n",
9939 md_kick_rdev_from_array(rdev2);
9943 clear_bit(Candidate, &rdev2->flags);
9946 if (role != rdev2->raid_disk) {
9948 * got activated except reshape is happening.
9950 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9951 !(le32_to_cpu(sb->feature_map) &
9952 MD_FEATURE_RESHAPE_ACTIVE)) {
9953 rdev2->saved_raid_disk = role;
9954 ret = remove_and_add_spares(mddev, rdev2);
9955 pr_info("Activated spare: %pg\n",
9957 /* wakeup mddev->thread here, so array could
9958 * perform resync with the new activated disk */
9959 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9960 md_wakeup_thread(mddev->thread);
9963 * We just want to do the minimum to mark the disk
9964 * as faulty. The recovery is performed by the
9965 * one who initiated the error.
9967 if (role == MD_DISK_ROLE_FAULTY ||
9968 role == MD_DISK_ROLE_JOURNAL) {
9969 md_error(mddev, rdev2);
9970 clear_bit(Blocked, &rdev2->flags);
9975 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9976 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9978 pr_warn("md: updating array disks failed. %d\n", ret);
9982 * Since mddev->delta_disks has already updated in update_raid_disks,
9983 * so it is time to check reshape.
9985 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9986 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9988 * reshape is happening in the remote node, we need to
9989 * update reshape_position and call start_reshape.
9991 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9992 if (mddev->pers->update_reshape_pos)
9993 mddev->pers->update_reshape_pos(mddev);
9994 if (mddev->pers->start_reshape)
9995 mddev->pers->start_reshape(mddev);
9996 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9997 mddev->reshape_position != MaxSector &&
9998 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9999 /* reshape is just done in another node. */
10000 mddev->reshape_position = MaxSector;
10001 if (mddev->pers->update_reshape_pos)
10002 mddev->pers->update_reshape_pos(mddev);
10005 /* Finally set the event to be up to date */
10006 mddev->events = le64_to_cpu(sb->events);
10009 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
10012 struct page *swapout = rdev->sb_page;
10013 struct mdp_superblock_1 *sb;
10015 /* Store the sb page of the rdev in the swapout temporary
10016 * variable in case we err in the future
10018 rdev->sb_page = NULL;
10019 err = alloc_disk_sb(rdev);
10021 ClearPageUptodate(rdev->sb_page);
10022 rdev->sb_loaded = 0;
10023 err = super_types[mddev->major_version].
10024 load_super(rdev, NULL, mddev->minor_version);
10027 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
10028 __func__, __LINE__, rdev->desc_nr, err);
10030 put_page(rdev->sb_page);
10031 rdev->sb_page = swapout;
10032 rdev->sb_loaded = 1;
10036 sb = page_address(rdev->sb_page);
10037 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
10041 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
10042 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
10044 /* The other node finished recovery, call spare_active to set
10045 * device In_sync and mddev->degraded
10047 if (rdev->recovery_offset == MaxSector &&
10048 !test_bit(In_sync, &rdev->flags) &&
10049 mddev->pers->spare_active(mddev))
10050 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
10056 void md_reload_sb(struct mddev *mddev, int nr)
10058 struct md_rdev *rdev = NULL, *iter;
10061 /* Find the rdev */
10062 rdev_for_each_rcu(iter, mddev) {
10063 if (iter->desc_nr == nr) {
10070 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
10074 err = read_rdev(mddev, rdev);
10078 check_sb_changes(mddev, rdev);
10080 /* Read all rdev's to update recovery_offset */
10081 rdev_for_each_rcu(rdev, mddev) {
10082 if (!test_bit(Faulty, &rdev->flags))
10083 read_rdev(mddev, rdev);
10086 EXPORT_SYMBOL(md_reload_sb);
10091 * Searches all registered partitions for autorun RAID arrays
10095 static DEFINE_MUTEX(detected_devices_mutex);
10096 static LIST_HEAD(all_detected_devices);
10097 struct detected_devices_node {
10098 struct list_head list;
10102 void md_autodetect_dev(dev_t dev)
10104 struct detected_devices_node *node_detected_dev;
10106 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
10107 if (node_detected_dev) {
10108 node_detected_dev->dev = dev;
10109 mutex_lock(&detected_devices_mutex);
10110 list_add_tail(&node_detected_dev->list, &all_detected_devices);
10111 mutex_unlock(&detected_devices_mutex);
10115 void md_autostart_arrays(int part)
10117 struct md_rdev *rdev;
10118 struct detected_devices_node *node_detected_dev;
10120 int i_scanned, i_passed;
10125 pr_info("md: Autodetecting RAID arrays.\n");
10127 mutex_lock(&detected_devices_mutex);
10128 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
10130 node_detected_dev = list_entry(all_detected_devices.next,
10131 struct detected_devices_node, list);
10132 list_del(&node_detected_dev->list);
10133 dev = node_detected_dev->dev;
10134 kfree(node_detected_dev);
10135 mutex_unlock(&detected_devices_mutex);
10136 rdev = md_import_device(dev,0, 90);
10137 mutex_lock(&detected_devices_mutex);
10141 if (test_bit(Faulty, &rdev->flags))
10144 set_bit(AutoDetected, &rdev->flags);
10145 list_add(&rdev->same_set, &pending_raid_disks);
10148 mutex_unlock(&detected_devices_mutex);
10150 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
10152 autorun_devices(part);
10155 #endif /* !MODULE */
10157 static __exit void md_exit(void)
10159 struct mddev *mddev, *n;
10162 unregister_blkdev(MD_MAJOR,"md");
10163 unregister_blkdev(mdp_major, "mdp");
10164 unregister_reboot_notifier(&md_notifier);
10165 unregister_sysctl_table(raid_table_header);
10167 /* We cannot unload the modules while some process is
10168 * waiting for us in select() or poll() - wake them up
10171 while (waitqueue_active(&md_event_waiters)) {
10172 /* not safe to leave yet */
10173 wake_up(&md_event_waiters);
10177 remove_proc_entry("mdstat", NULL);
10179 spin_lock(&all_mddevs_lock);
10180 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
10181 if (!mddev_get(mddev))
10183 spin_unlock(&all_mddevs_lock);
10184 export_array(mddev);
10186 mddev->hold_active = 0;
10188 * As the mddev is now fully clear, mddev_put will schedule
10189 * the mddev for destruction by a workqueue, and the
10190 * destroy_workqueue() below will wait for that to complete.
10193 spin_lock(&all_mddevs_lock);
10195 spin_unlock(&all_mddevs_lock);
10197 destroy_workqueue(md_misc_wq);
10198 destroy_workqueue(md_bitmap_wq);
10199 destroy_workqueue(md_wq);
10202 subsys_initcall(md_init);
10203 module_exit(md_exit)
10205 static int get_ro(char *buffer, const struct kernel_param *kp)
10207 return sprintf(buffer, "%d\n", start_readonly);
10209 static int set_ro(const char *val, const struct kernel_param *kp)
10211 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
10214 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
10215 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
10216 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
10217 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
10219 MODULE_LICENSE("GPL");
10220 MODULE_DESCRIPTION("MD RAID framework");
10221 MODULE_ALIAS("md");
10222 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);