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 rdev->desc_nr = sb->this_disk.number;
1310 /* not spare disk */
1311 if (rdev->desc_nr >= 0 && rdev->desc_nr < MD_SB_DISKS &&
1312 sb->disks[rdev->desc_nr].state & ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1322 mdp_super_t *refsb = page_address(refdev->sb_page);
1323 if (!md_uuid_equal(refsb, sb)) {
1324 pr_warn("md: %pg has different UUID to %pg\n",
1325 rdev->bdev, refdev->bdev);
1328 if (!md_sb_equal(refsb, sb)) {
1329 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1330 rdev->bdev, refdev->bdev);
1334 ev2 = md_event(refsb);
1336 if (!spare_disk && ev1 > ev2)
1341 rdev->sectors = rdev->sb_start;
1342 /* Limit to 4TB as metadata cannot record more than that.
1343 * (not needed for Linear and RAID0 as metadata doesn't
1346 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1347 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1349 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1350 /* "this cannot possibly happen" ... */
1358 * validate_super for 0.90.0
1359 * note: we are not using "freshest" for 0.9 superblock
1361 static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1364 mdp_super_t *sb = page_address(rdev->sb_page);
1365 __u64 ev1 = md_event(sb);
1367 rdev->raid_disk = -1;
1368 clear_bit(Faulty, &rdev->flags);
1369 clear_bit(In_sync, &rdev->flags);
1370 clear_bit(Bitmap_sync, &rdev->flags);
1371 clear_bit(WriteMostly, &rdev->flags);
1373 if (mddev->raid_disks == 0) {
1374 mddev->major_version = 0;
1375 mddev->minor_version = sb->minor_version;
1376 mddev->patch_version = sb->patch_version;
1377 mddev->external = 0;
1378 mddev->chunk_sectors = sb->chunk_size >> 9;
1379 mddev->ctime = sb->ctime;
1380 mddev->utime = sb->utime;
1381 mddev->level = sb->level;
1382 mddev->clevel[0] = 0;
1383 mddev->layout = sb->layout;
1384 mddev->raid_disks = sb->raid_disks;
1385 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1386 mddev->events = ev1;
1387 mddev->bitmap_info.offset = 0;
1388 mddev->bitmap_info.space = 0;
1389 /* bitmap can use 60 K after the 4K superblocks */
1390 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1391 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1392 mddev->reshape_backwards = 0;
1394 if (mddev->minor_version >= 91) {
1395 mddev->reshape_position = sb->reshape_position;
1396 mddev->delta_disks = sb->delta_disks;
1397 mddev->new_level = sb->new_level;
1398 mddev->new_layout = sb->new_layout;
1399 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1400 if (mddev->delta_disks < 0)
1401 mddev->reshape_backwards = 1;
1403 mddev->reshape_position = MaxSector;
1404 mddev->delta_disks = 0;
1405 mddev->new_level = mddev->level;
1406 mddev->new_layout = mddev->layout;
1407 mddev->new_chunk_sectors = mddev->chunk_sectors;
1409 if (mddev->level == 0)
1412 if (sb->state & (1<<MD_SB_CLEAN))
1413 mddev->recovery_cp = MaxSector;
1415 if (sb->events_hi == sb->cp_events_hi &&
1416 sb->events_lo == sb->cp_events_lo) {
1417 mddev->recovery_cp = sb->recovery_cp;
1419 mddev->recovery_cp = 0;
1422 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1423 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1424 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1425 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1427 mddev->max_disks = MD_SB_DISKS;
1429 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1430 mddev->bitmap_info.file == NULL) {
1431 mddev->bitmap_info.offset =
1432 mddev->bitmap_info.default_offset;
1433 mddev->bitmap_info.space =
1434 mddev->bitmap_info.default_space;
1437 } else if (mddev->pers == NULL) {
1438 /* Insist on good event counter while assembling, except
1439 * for spares (which don't need an event count) */
1441 if (sb->disks[rdev->desc_nr].state & (
1442 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1443 if (ev1 < mddev->events)
1445 } else if (mddev->bitmap) {
1446 /* if adding to array with a bitmap, then we can accept an
1447 * older device ... but not too old.
1449 if (ev1 < mddev->bitmap->events_cleared)
1451 if (ev1 < mddev->events)
1452 set_bit(Bitmap_sync, &rdev->flags);
1454 if (ev1 < mddev->events)
1455 /* just a hot-add of a new device, leave raid_disk at -1 */
1459 desc = sb->disks + rdev->desc_nr;
1461 if (desc->state & (1<<MD_DISK_FAULTY))
1462 set_bit(Faulty, &rdev->flags);
1463 else if (desc->state & (1<<MD_DISK_SYNC)) {
1464 set_bit(In_sync, &rdev->flags);
1465 rdev->raid_disk = desc->raid_disk;
1466 rdev->saved_raid_disk = desc->raid_disk;
1467 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1468 /* active but not in sync implies recovery up to
1469 * reshape position. We don't know exactly where
1470 * that is, so set to zero for now
1472 if (mddev->minor_version >= 91) {
1473 rdev->recovery_offset = 0;
1474 rdev->raid_disk = desc->raid_disk;
1477 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1478 set_bit(WriteMostly, &rdev->flags);
1479 if (desc->state & (1<<MD_DISK_FAILFAST))
1480 set_bit(FailFast, &rdev->flags);
1485 * sync_super for 0.90.0
1487 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1490 struct md_rdev *rdev2;
1491 int next_spare = mddev->raid_disks;
1493 /* make rdev->sb match mddev data..
1496 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1497 * 3/ any empty disks < next_spare become removed
1499 * disks[0] gets initialised to REMOVED because
1500 * we cannot be sure from other fields if it has
1501 * been initialised or not.
1504 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1506 rdev->sb_size = MD_SB_BYTES;
1508 sb = page_address(rdev->sb_page);
1510 memset(sb, 0, sizeof(*sb));
1512 sb->md_magic = MD_SB_MAGIC;
1513 sb->major_version = mddev->major_version;
1514 sb->patch_version = mddev->patch_version;
1515 sb->gvalid_words = 0; /* ignored */
1516 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1517 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1518 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1519 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1521 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1522 sb->level = mddev->level;
1523 sb->size = mddev->dev_sectors / 2;
1524 sb->raid_disks = mddev->raid_disks;
1525 sb->md_minor = mddev->md_minor;
1526 sb->not_persistent = 0;
1527 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1529 sb->events_hi = (mddev->events>>32);
1530 sb->events_lo = (u32)mddev->events;
1532 if (mddev->reshape_position == MaxSector)
1533 sb->minor_version = 90;
1535 sb->minor_version = 91;
1536 sb->reshape_position = mddev->reshape_position;
1537 sb->new_level = mddev->new_level;
1538 sb->delta_disks = mddev->delta_disks;
1539 sb->new_layout = mddev->new_layout;
1540 sb->new_chunk = mddev->new_chunk_sectors << 9;
1542 mddev->minor_version = sb->minor_version;
1545 sb->recovery_cp = mddev->recovery_cp;
1546 sb->cp_events_hi = (mddev->events>>32);
1547 sb->cp_events_lo = (u32)mddev->events;
1548 if (mddev->recovery_cp == MaxSector)
1549 sb->state = (1<< MD_SB_CLEAN);
1551 sb->recovery_cp = 0;
1553 sb->layout = mddev->layout;
1554 sb->chunk_size = mddev->chunk_sectors << 9;
1556 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1557 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1559 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1560 rdev_for_each(rdev2, mddev) {
1563 int is_active = test_bit(In_sync, &rdev2->flags);
1565 if (rdev2->raid_disk >= 0 &&
1566 sb->minor_version >= 91)
1567 /* we have nowhere to store the recovery_offset,
1568 * but if it is not below the reshape_position,
1569 * we can piggy-back on that.
1572 if (rdev2->raid_disk < 0 ||
1573 test_bit(Faulty, &rdev2->flags))
1576 desc_nr = rdev2->raid_disk;
1578 desc_nr = next_spare++;
1579 rdev2->desc_nr = desc_nr;
1580 d = &sb->disks[rdev2->desc_nr];
1582 d->number = rdev2->desc_nr;
1583 d->major = MAJOR(rdev2->bdev->bd_dev);
1584 d->minor = MINOR(rdev2->bdev->bd_dev);
1586 d->raid_disk = rdev2->raid_disk;
1588 d->raid_disk = rdev2->desc_nr; /* compatibility */
1589 if (test_bit(Faulty, &rdev2->flags))
1590 d->state = (1<<MD_DISK_FAULTY);
1591 else if (is_active) {
1592 d->state = (1<<MD_DISK_ACTIVE);
1593 if (test_bit(In_sync, &rdev2->flags))
1594 d->state |= (1<<MD_DISK_SYNC);
1602 if (test_bit(WriteMostly, &rdev2->flags))
1603 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1604 if (test_bit(FailFast, &rdev2->flags))
1605 d->state |= (1<<MD_DISK_FAILFAST);
1607 /* now set the "removed" and "faulty" bits on any missing devices */
1608 for (i=0 ; i < mddev->raid_disks ; i++) {
1609 mdp_disk_t *d = &sb->disks[i];
1610 if (d->state == 0 && d->number == 0) {
1613 d->state = (1<<MD_DISK_REMOVED);
1614 d->state |= (1<<MD_DISK_FAULTY);
1618 sb->nr_disks = nr_disks;
1619 sb->active_disks = active;
1620 sb->working_disks = working;
1621 sb->failed_disks = failed;
1622 sb->spare_disks = spare;
1624 sb->this_disk = sb->disks[rdev->desc_nr];
1625 sb->sb_csum = calc_sb_csum(sb);
1629 * rdev_size_change for 0.90.0
1631 static unsigned long long
1632 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1634 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1635 return 0; /* component must fit device */
1636 if (rdev->mddev->bitmap_info.offset)
1637 return 0; /* can't move bitmap */
1638 rdev->sb_start = calc_dev_sboffset(rdev);
1639 if (!num_sectors || num_sectors > rdev->sb_start)
1640 num_sectors = rdev->sb_start;
1641 /* Limit to 4TB as metadata cannot record more than that.
1642 * 4TB == 2^32 KB, or 2*2^32 sectors.
1644 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1645 num_sectors = (sector_t)(2ULL << 32) - 2;
1647 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1649 } while (md_super_wait(rdev->mddev) < 0);
1654 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1656 /* non-zero offset changes not possible with v0.90 */
1657 return new_offset == 0;
1661 * version 1 superblock
1664 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1668 unsigned long long newcsum;
1669 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1670 __le32 *isuper = (__le32*)sb;
1672 disk_csum = sb->sb_csum;
1675 for (; size >= 4; size -= 4)
1676 newcsum += le32_to_cpu(*isuper++);
1679 newcsum += le16_to_cpu(*(__le16*) isuper);
1681 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1682 sb->sb_csum = disk_csum;
1683 return cpu_to_le32(csum);
1686 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1688 struct mdp_superblock_1 *sb;
1693 bool spare_disk = true;
1696 * Calculate the position of the superblock in 512byte sectors.
1697 * It is always aligned to a 4K boundary and
1698 * depeding on minor_version, it can be:
1699 * 0: At least 8K, but less than 12K, from end of device
1700 * 1: At start of device
1701 * 2: 4K from start of device.
1703 switch(minor_version) {
1705 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1706 sb_start &= ~(sector_t)(4*2-1);
1717 rdev->sb_start = sb_start;
1719 /* superblock is rarely larger than 1K, but it can be larger,
1720 * and it is safe to read 4k, so we do that
1722 ret = read_disk_sb(rdev, 4096);
1723 if (ret) return ret;
1725 sb = page_address(rdev->sb_page);
1727 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1728 sb->major_version != cpu_to_le32(1) ||
1729 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1730 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1731 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1734 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1735 pr_warn("md: invalid superblock checksum on %pg\n",
1739 if (le64_to_cpu(sb->data_size) < 10) {
1740 pr_warn("md: data_size too small on %pg\n",
1746 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1747 /* Some padding is non-zero, might be a new feature */
1750 rdev->preferred_minor = 0xffff;
1751 rdev->data_offset = le64_to_cpu(sb->data_offset);
1752 rdev->new_data_offset = rdev->data_offset;
1753 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1754 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1755 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1756 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1758 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1759 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1760 if (rdev->sb_size & bmask)
1761 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1764 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1767 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1770 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1772 if (!rdev->bb_page) {
1773 rdev->bb_page = alloc_page(GFP_KERNEL);
1777 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1778 rdev->badblocks.count == 0) {
1779 /* need to load the bad block list.
1780 * Currently we limit it to one page.
1786 int sectors = le16_to_cpu(sb->bblog_size);
1787 if (sectors > (PAGE_SIZE / 512))
1789 offset = le32_to_cpu(sb->bblog_offset);
1792 bb_sector = (long long)offset;
1793 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1794 rdev->bb_page, REQ_OP_READ, true))
1796 bbp = (__le64 *)page_address(rdev->bb_page);
1797 rdev->badblocks.shift = sb->bblog_shift;
1798 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1799 u64 bb = le64_to_cpu(*bbp);
1800 int count = bb & (0x3ff);
1801 u64 sector = bb >> 10;
1802 sector <<= sb->bblog_shift;
1803 count <<= sb->bblog_shift;
1806 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1809 } else if (sb->bblog_offset != 0)
1810 rdev->badblocks.shift = 0;
1812 if ((le32_to_cpu(sb->feature_map) &
1813 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1814 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1815 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1816 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1819 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1823 /* not spare disk */
1824 if (rdev->desc_nr >= 0 && rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1825 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1826 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1836 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1838 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1839 sb->level != refsb->level ||
1840 sb->layout != refsb->layout ||
1841 sb->chunksize != refsb->chunksize) {
1842 pr_warn("md: %pg has strangely different superblock to %pg\n",
1847 ev1 = le64_to_cpu(sb->events);
1848 ev2 = le64_to_cpu(refsb->events);
1850 if (!spare_disk && ev1 > ev2)
1856 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1858 sectors = rdev->sb_start;
1859 if (sectors < le64_to_cpu(sb->data_size))
1861 rdev->sectors = le64_to_cpu(sb->data_size);
1865 static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1867 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1868 __u64 ev1 = le64_to_cpu(sb->events);
1871 rdev->raid_disk = -1;
1872 clear_bit(Faulty, &rdev->flags);
1873 clear_bit(In_sync, &rdev->flags);
1874 clear_bit(Bitmap_sync, &rdev->flags);
1875 clear_bit(WriteMostly, &rdev->flags);
1877 if (mddev->raid_disks == 0) {
1878 mddev->major_version = 1;
1879 mddev->patch_version = 0;
1880 mddev->external = 0;
1881 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1882 mddev->ctime = le64_to_cpu(sb->ctime);
1883 mddev->utime = le64_to_cpu(sb->utime);
1884 mddev->level = le32_to_cpu(sb->level);
1885 mddev->clevel[0] = 0;
1886 mddev->layout = le32_to_cpu(sb->layout);
1887 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1888 mddev->dev_sectors = le64_to_cpu(sb->size);
1889 mddev->events = ev1;
1890 mddev->bitmap_info.offset = 0;
1891 mddev->bitmap_info.space = 0;
1892 /* Default location for bitmap is 1K after superblock
1893 * using 3K - total of 4K
1895 mddev->bitmap_info.default_offset = 1024 >> 9;
1896 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1897 mddev->reshape_backwards = 0;
1899 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1900 memcpy(mddev->uuid, sb->set_uuid, 16);
1902 mddev->max_disks = (4096-256)/2;
1904 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1905 mddev->bitmap_info.file == NULL) {
1906 mddev->bitmap_info.offset =
1907 (__s32)le32_to_cpu(sb->bitmap_offset);
1908 /* Metadata doesn't record how much space is available.
1909 * For 1.0, we assume we can use up to the superblock
1910 * if before, else to 4K beyond superblock.
1911 * For others, assume no change is possible.
1913 if (mddev->minor_version > 0)
1914 mddev->bitmap_info.space = 0;
1915 else if (mddev->bitmap_info.offset > 0)
1916 mddev->bitmap_info.space =
1917 8 - mddev->bitmap_info.offset;
1919 mddev->bitmap_info.space =
1920 -mddev->bitmap_info.offset;
1923 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1924 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1925 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1926 mddev->new_level = le32_to_cpu(sb->new_level);
1927 mddev->new_layout = le32_to_cpu(sb->new_layout);
1928 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1929 if (mddev->delta_disks < 0 ||
1930 (mddev->delta_disks == 0 &&
1931 (le32_to_cpu(sb->feature_map)
1932 & MD_FEATURE_RESHAPE_BACKWARDS)))
1933 mddev->reshape_backwards = 1;
1935 mddev->reshape_position = MaxSector;
1936 mddev->delta_disks = 0;
1937 mddev->new_level = mddev->level;
1938 mddev->new_layout = mddev->layout;
1939 mddev->new_chunk_sectors = mddev->chunk_sectors;
1942 if (mddev->level == 0 &&
1943 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1946 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1947 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1949 if (le32_to_cpu(sb->feature_map) &
1950 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1951 if (le32_to_cpu(sb->feature_map) &
1952 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1954 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1955 (le32_to_cpu(sb->feature_map) &
1956 MD_FEATURE_MULTIPLE_PPLS))
1958 set_bit(MD_HAS_PPL, &mddev->flags);
1960 } else if (mddev->pers == NULL) {
1961 /* Insist of good event counter while assembling, except for
1962 * spares (which don't need an event count).
1963 * Similar to mdadm, we allow event counter difference of 1
1964 * from the freshest device.
1966 if (rdev->desc_nr >= 0 &&
1967 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1968 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1969 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1970 if (ev1 + 1 < mddev->events)
1972 } else if (mddev->bitmap) {
1973 /* If adding to array with a bitmap, then we can accept an
1974 * older device, but not too old.
1976 if (ev1 < mddev->bitmap->events_cleared)
1978 if (ev1 < mddev->events)
1979 set_bit(Bitmap_sync, &rdev->flags);
1981 if (ev1 < mddev->events)
1982 /* just a hot-add of a new device, leave raid_disk at -1 */
1986 if (rdev->desc_nr < 0 ||
1987 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1988 role = MD_DISK_ROLE_SPARE;
1990 } else if (mddev->pers == NULL && freshest && ev1 < mddev->events) {
1992 * If we are assembling, and our event counter is smaller than the
1993 * highest event counter, we cannot trust our superblock about the role.
1994 * It could happen that our rdev was marked as Faulty, and all other
1995 * superblocks were updated with +1 event counter.
1996 * Then, before the next superblock update, which typically happens when
1997 * remove_and_add_spares() removes the device from the array, there was
1998 * a crash or reboot.
1999 * If we allow current rdev without consulting the freshest superblock,
2000 * we could cause data corruption.
2001 * Note that in this case our event counter is smaller by 1 than the
2002 * highest, otherwise, this rdev would not be allowed into array;
2003 * both kernel and mdadm allow event counter difference of 1.
2005 struct mdp_superblock_1 *freshest_sb = page_address(freshest->sb_page);
2006 u32 freshest_max_dev = le32_to_cpu(freshest_sb->max_dev);
2008 if (rdev->desc_nr >= freshest_max_dev) {
2009 /* this is unexpected, better not proceed */
2010 pr_warn("md: %s: rdev[%pg]: desc_nr(%d) >= freshest(%pg)->sb->max_dev(%u)\n",
2011 mdname(mddev), rdev->bdev, rdev->desc_nr,
2012 freshest->bdev, freshest_max_dev);
2016 role = le16_to_cpu(freshest_sb->dev_roles[rdev->desc_nr]);
2017 pr_debug("md: %s: rdev[%pg]: role=%d(0x%x) according to freshest %pg\n",
2018 mdname(mddev), rdev->bdev, role, role, freshest->bdev);
2020 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2023 case MD_DISK_ROLE_SPARE: /* spare */
2025 case MD_DISK_ROLE_FAULTY: /* faulty */
2026 set_bit(Faulty, &rdev->flags);
2028 case MD_DISK_ROLE_JOURNAL: /* journal device */
2029 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
2030 /* journal device without journal feature */
2031 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
2034 set_bit(Journal, &rdev->flags);
2035 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
2036 rdev->raid_disk = 0;
2039 rdev->saved_raid_disk = role;
2040 if ((le32_to_cpu(sb->feature_map) &
2041 MD_FEATURE_RECOVERY_OFFSET)) {
2042 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
2043 if (!(le32_to_cpu(sb->feature_map) &
2044 MD_FEATURE_RECOVERY_BITMAP))
2045 rdev->saved_raid_disk = -1;
2048 * If the array is FROZEN, then the device can't
2049 * be in_sync with rest of array.
2051 if (!test_bit(MD_RECOVERY_FROZEN,
2053 set_bit(In_sync, &rdev->flags);
2055 rdev->raid_disk = role;
2058 if (sb->devflags & WriteMostly1)
2059 set_bit(WriteMostly, &rdev->flags);
2060 if (sb->devflags & FailFast1)
2061 set_bit(FailFast, &rdev->flags);
2062 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
2063 set_bit(Replacement, &rdev->flags);
2068 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
2070 struct mdp_superblock_1 *sb;
2071 struct md_rdev *rdev2;
2073 /* make rdev->sb match mddev and rdev data. */
2075 sb = page_address(rdev->sb_page);
2077 sb->feature_map = 0;
2079 sb->recovery_offset = cpu_to_le64(0);
2080 memset(sb->pad3, 0, sizeof(sb->pad3));
2082 sb->utime = cpu_to_le64((__u64)mddev->utime);
2083 sb->events = cpu_to_le64(mddev->events);
2085 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
2086 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
2087 sb->resync_offset = cpu_to_le64(MaxSector);
2089 sb->resync_offset = cpu_to_le64(0);
2091 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2093 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2094 sb->size = cpu_to_le64(mddev->dev_sectors);
2095 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2096 sb->level = cpu_to_le32(mddev->level);
2097 sb->layout = cpu_to_le32(mddev->layout);
2098 if (test_bit(FailFast, &rdev->flags))
2099 sb->devflags |= FailFast1;
2101 sb->devflags &= ~FailFast1;
2103 if (test_bit(WriteMostly, &rdev->flags))
2104 sb->devflags |= WriteMostly1;
2106 sb->devflags &= ~WriteMostly1;
2107 sb->data_offset = cpu_to_le64(rdev->data_offset);
2108 sb->data_size = cpu_to_le64(rdev->sectors);
2110 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2111 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2112 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2115 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2116 !test_bit(In_sync, &rdev->flags)) {
2118 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2119 sb->recovery_offset =
2120 cpu_to_le64(rdev->recovery_offset);
2121 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2123 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2125 /* Note: recovery_offset and journal_tail share space */
2126 if (test_bit(Journal, &rdev->flags))
2127 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2128 if (test_bit(Replacement, &rdev->flags))
2130 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2132 if (mddev->reshape_position != MaxSector) {
2133 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2134 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2135 sb->new_layout = cpu_to_le32(mddev->new_layout);
2136 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2137 sb->new_level = cpu_to_le32(mddev->new_level);
2138 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2139 if (mddev->delta_disks == 0 &&
2140 mddev->reshape_backwards)
2142 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2143 if (rdev->new_data_offset != rdev->data_offset) {
2145 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2146 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2147 - rdev->data_offset));
2151 if (mddev_is_clustered(mddev))
2152 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2154 if (rdev->badblocks.count == 0)
2155 /* Nothing to do for bad blocks*/ ;
2156 else if (sb->bblog_offset == 0)
2157 /* Cannot record bad blocks on this device */
2158 md_error(mddev, rdev);
2160 struct badblocks *bb = &rdev->badblocks;
2161 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2163 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2168 seq = read_seqbegin(&bb->lock);
2170 memset(bbp, 0xff, PAGE_SIZE);
2172 for (i = 0 ; i < bb->count ; i++) {
2173 u64 internal_bb = p[i];
2174 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2175 | BB_LEN(internal_bb));
2176 bbp[i] = cpu_to_le64(store_bb);
2179 if (read_seqretry(&bb->lock, seq))
2182 bb->sector = (rdev->sb_start +
2183 (int)le32_to_cpu(sb->bblog_offset));
2184 bb->size = le16_to_cpu(sb->bblog_size);
2189 rdev_for_each(rdev2, mddev)
2190 if (rdev2->desc_nr+1 > max_dev)
2191 max_dev = rdev2->desc_nr+1;
2193 if (max_dev > le32_to_cpu(sb->max_dev)) {
2195 sb->max_dev = cpu_to_le32(max_dev);
2196 rdev->sb_size = max_dev * 2 + 256;
2197 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2198 if (rdev->sb_size & bmask)
2199 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2201 max_dev = le32_to_cpu(sb->max_dev);
2203 for (i=0; i<max_dev;i++)
2204 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2206 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2207 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2209 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2210 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2212 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2214 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2215 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2216 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2219 rdev_for_each(rdev2, mddev) {
2221 if (test_bit(Faulty, &rdev2->flags))
2222 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2223 else if (test_bit(In_sync, &rdev2->flags))
2224 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2225 else if (test_bit(Journal, &rdev2->flags))
2226 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2227 else if (rdev2->raid_disk >= 0)
2228 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2230 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2233 sb->sb_csum = calc_sb_1_csum(sb);
2236 static sector_t super_1_choose_bm_space(sector_t dev_size)
2240 /* if the device is bigger than 8Gig, save 64k for bitmap
2241 * usage, if bigger than 200Gig, save 128k
2243 if (dev_size < 64*2)
2245 else if (dev_size - 64*2 >= 200*1024*1024*2)
2247 else if (dev_size - 4*2 > 8*1024*1024*2)
2254 static unsigned long long
2255 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2257 struct mdp_superblock_1 *sb;
2258 sector_t max_sectors;
2259 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2260 return 0; /* component must fit device */
2261 if (rdev->data_offset != rdev->new_data_offset)
2262 return 0; /* too confusing */
2263 if (rdev->sb_start < rdev->data_offset) {
2264 /* minor versions 1 and 2; superblock before data */
2265 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2266 if (!num_sectors || num_sectors > max_sectors)
2267 num_sectors = max_sectors;
2268 } else if (rdev->mddev->bitmap_info.offset) {
2269 /* minor version 0 with bitmap we can't move */
2272 /* minor version 0; superblock after data */
2273 sector_t sb_start, bm_space;
2274 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2276 /* 8K is for superblock */
2277 sb_start = dev_size - 8*2;
2278 sb_start &= ~(sector_t)(4*2 - 1);
2280 bm_space = super_1_choose_bm_space(dev_size);
2282 /* Space that can be used to store date needs to decrease
2283 * superblock bitmap space and bad block space(4K)
2285 max_sectors = sb_start - bm_space - 4*2;
2287 if (!num_sectors || num_sectors > max_sectors)
2288 num_sectors = max_sectors;
2289 rdev->sb_start = sb_start;
2291 sb = page_address(rdev->sb_page);
2292 sb->data_size = cpu_to_le64(num_sectors);
2293 sb->super_offset = cpu_to_le64(rdev->sb_start);
2294 sb->sb_csum = calc_sb_1_csum(sb);
2296 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2298 } while (md_super_wait(rdev->mddev) < 0);
2304 super_1_allow_new_offset(struct md_rdev *rdev,
2305 unsigned long long new_offset)
2307 /* All necessary checks on new >= old have been done */
2308 struct bitmap *bitmap;
2309 if (new_offset >= rdev->data_offset)
2312 /* with 1.0 metadata, there is no metadata to tread on
2313 * so we can always move back */
2314 if (rdev->mddev->minor_version == 0)
2317 /* otherwise we must be sure not to step on
2318 * any metadata, so stay:
2319 * 36K beyond start of superblock
2320 * beyond end of badblocks
2321 * beyond write-intent bitmap
2323 if (rdev->sb_start + (32+4)*2 > new_offset)
2325 bitmap = rdev->mddev->bitmap;
2326 if (bitmap && !rdev->mddev->bitmap_info.file &&
2327 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2328 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2330 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2336 static struct super_type super_types[] = {
2339 .owner = THIS_MODULE,
2340 .load_super = super_90_load,
2341 .validate_super = super_90_validate,
2342 .sync_super = super_90_sync,
2343 .rdev_size_change = super_90_rdev_size_change,
2344 .allow_new_offset = super_90_allow_new_offset,
2348 .owner = THIS_MODULE,
2349 .load_super = super_1_load,
2350 .validate_super = super_1_validate,
2351 .sync_super = super_1_sync,
2352 .rdev_size_change = super_1_rdev_size_change,
2353 .allow_new_offset = super_1_allow_new_offset,
2357 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2359 if (mddev->sync_super) {
2360 mddev->sync_super(mddev, rdev);
2364 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2366 super_types[mddev->major_version].sync_super(mddev, rdev);
2369 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2371 struct md_rdev *rdev, *rdev2;
2374 rdev_for_each_rcu(rdev, mddev1) {
2375 if (test_bit(Faulty, &rdev->flags) ||
2376 test_bit(Journal, &rdev->flags) ||
2377 rdev->raid_disk == -1)
2379 rdev_for_each_rcu(rdev2, mddev2) {
2380 if (test_bit(Faulty, &rdev2->flags) ||
2381 test_bit(Journal, &rdev2->flags) ||
2382 rdev2->raid_disk == -1)
2384 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2394 static LIST_HEAD(pending_raid_disks);
2397 * Try to register data integrity profile for an mddev
2399 * This is called when an array is started and after a disk has been kicked
2400 * from the array. It only succeeds if all working and active component devices
2401 * are integrity capable with matching profiles.
2403 int md_integrity_register(struct mddev *mddev)
2405 struct md_rdev *rdev, *reference = NULL;
2407 if (list_empty(&mddev->disks))
2408 return 0; /* nothing to do */
2409 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2410 return 0; /* shouldn't register, or already is */
2411 rdev_for_each(rdev, mddev) {
2412 /* skip spares and non-functional disks */
2413 if (test_bit(Faulty, &rdev->flags))
2415 if (rdev->raid_disk < 0)
2418 /* Use the first rdev as the reference */
2422 /* does this rdev's profile match the reference profile? */
2423 if (blk_integrity_compare(reference->bdev->bd_disk,
2424 rdev->bdev->bd_disk) < 0)
2427 if (!reference || !bdev_get_integrity(reference->bdev))
2430 * All component devices are integrity capable and have matching
2431 * profiles, register the common profile for the md device.
2433 blk_integrity_register(mddev->gendisk,
2434 bdev_get_integrity(reference->bdev));
2436 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2437 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2438 (mddev->level != 1 && mddev->level != 10 &&
2439 bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) {
2441 * No need to handle the failure of bioset_integrity_create,
2442 * because the function is called by md_run() -> pers->run(),
2443 * md_run calls bioset_exit -> bioset_integrity_free in case
2446 pr_err("md: failed to create integrity pool for %s\n",
2452 EXPORT_SYMBOL(md_integrity_register);
2455 * Attempt to add an rdev, but only if it is consistent with the current
2458 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2460 struct blk_integrity *bi_mddev;
2462 if (!mddev->gendisk)
2465 bi_mddev = blk_get_integrity(mddev->gendisk);
2467 if (!bi_mddev) /* nothing to do */
2470 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2471 pr_err("%s: incompatible integrity profile for %pg\n",
2472 mdname(mddev), rdev->bdev);
2478 EXPORT_SYMBOL(md_integrity_add_rdev);
2480 static bool rdev_read_only(struct md_rdev *rdev)
2482 return bdev_read_only(rdev->bdev) ||
2483 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2486 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2488 char b[BDEVNAME_SIZE];
2491 /* prevent duplicates */
2492 if (find_rdev(mddev, rdev->bdev->bd_dev))
2495 if (rdev_read_only(rdev) && mddev->pers)
2498 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2499 if (!test_bit(Journal, &rdev->flags) &&
2501 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2503 /* Cannot change size, so fail
2504 * If mddev->level <= 0, then we don't care
2505 * about aligning sizes (e.g. linear)
2507 if (mddev->level > 0)
2510 mddev->dev_sectors = rdev->sectors;
2513 /* Verify rdev->desc_nr is unique.
2514 * If it is -1, assign a free number, else
2515 * check number is not in use
2518 if (rdev->desc_nr < 0) {
2521 choice = mddev->raid_disks;
2522 while (md_find_rdev_nr_rcu(mddev, choice))
2524 rdev->desc_nr = choice;
2526 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2532 if (!test_bit(Journal, &rdev->flags) &&
2533 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2534 pr_warn("md: %s: array is limited to %d devices\n",
2535 mdname(mddev), mddev->max_disks);
2538 snprintf(b, sizeof(b), "%pg", rdev->bdev);
2539 strreplace(b, '/', '!');
2541 rdev->mddev = mddev;
2542 pr_debug("md: bind<%s>\n", b);
2544 if (mddev->raid_disks)
2545 mddev_create_serial_pool(mddev, rdev);
2547 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2550 /* failure here is OK */
2551 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2552 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2553 rdev->sysfs_unack_badblocks =
2554 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2555 rdev->sysfs_badblocks =
2556 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2558 list_add_rcu(&rdev->same_set, &mddev->disks);
2559 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2561 /* May as well allow recovery to be retried once */
2562 mddev->recovery_disabled++;
2567 pr_warn("md: failed to register dev-%s for %s\n",
2572 void md_autodetect_dev(dev_t dev);
2574 /* just for claiming the bdev */
2575 static struct md_rdev claim_rdev;
2577 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
2579 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2580 md_rdev_clear(rdev);
2582 if (test_bit(AutoDetected, &rdev->flags))
2583 md_autodetect_dev(rdev->bdev->bd_dev);
2585 fput(rdev->bdev_file);
2587 kobject_put(&rdev->kobj);
2590 static void md_kick_rdev_from_array(struct md_rdev *rdev)
2592 struct mddev *mddev = rdev->mddev;
2594 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2595 list_del_rcu(&rdev->same_set);
2596 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2597 mddev_destroy_serial_pool(rdev->mddev, rdev);
2599 sysfs_remove_link(&rdev->kobj, "block");
2600 sysfs_put(rdev->sysfs_state);
2601 sysfs_put(rdev->sysfs_unack_badblocks);
2602 sysfs_put(rdev->sysfs_badblocks);
2603 rdev->sysfs_state = NULL;
2604 rdev->sysfs_unack_badblocks = NULL;
2605 rdev->sysfs_badblocks = NULL;
2606 rdev->badblocks.count = 0;
2611 * kobject_del() will wait for all in progress writers to be done, where
2612 * reconfig_mutex is held, hence it can't be called under
2613 * reconfig_mutex and it's delayed to mddev_unlock().
2615 list_add(&rdev->same_set, &mddev->deleting);
2618 static void export_array(struct mddev *mddev)
2620 struct md_rdev *rdev;
2622 while (!list_empty(&mddev->disks)) {
2623 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2625 md_kick_rdev_from_array(rdev);
2627 mddev->raid_disks = 0;
2628 mddev->major_version = 0;
2631 static bool set_in_sync(struct mddev *mddev)
2633 lockdep_assert_held(&mddev->lock);
2634 if (!mddev->in_sync) {
2635 mddev->sync_checkers++;
2636 spin_unlock(&mddev->lock);
2637 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2638 spin_lock(&mddev->lock);
2639 if (!mddev->in_sync &&
2640 percpu_ref_is_zero(&mddev->writes_pending)) {
2643 * Ensure ->in_sync is visible before we clear
2647 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2648 sysfs_notify_dirent_safe(mddev->sysfs_state);
2650 if (--mddev->sync_checkers == 0)
2651 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2653 if (mddev->safemode == 1)
2654 mddev->safemode = 0;
2655 return mddev->in_sync;
2658 static void sync_sbs(struct mddev *mddev, int nospares)
2660 /* Update each superblock (in-memory image), but
2661 * if we are allowed to, skip spares which already
2662 * have the right event counter, or have one earlier
2663 * (which would mean they aren't being marked as dirty
2664 * with the rest of the array)
2666 struct md_rdev *rdev;
2667 rdev_for_each(rdev, mddev) {
2668 if (rdev->sb_events == mddev->events ||
2670 rdev->raid_disk < 0 &&
2671 rdev->sb_events+1 == mddev->events)) {
2672 /* Don't update this superblock */
2673 rdev->sb_loaded = 2;
2675 sync_super(mddev, rdev);
2676 rdev->sb_loaded = 1;
2681 static bool does_sb_need_changing(struct mddev *mddev)
2683 struct md_rdev *rdev = NULL, *iter;
2684 struct mdp_superblock_1 *sb;
2687 /* Find a good rdev */
2688 rdev_for_each(iter, mddev)
2689 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2694 /* No good device found. */
2698 sb = page_address(rdev->sb_page);
2699 /* Check if a device has become faulty or a spare become active */
2700 rdev_for_each(rdev, mddev) {
2701 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2702 /* Device activated? */
2703 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2704 !test_bit(Faulty, &rdev->flags))
2706 /* Device turned faulty? */
2707 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2711 /* Check if any mddev parameters have changed */
2712 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2713 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2714 (mddev->layout != le32_to_cpu(sb->layout)) ||
2715 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2716 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2722 void md_update_sb(struct mddev *mddev, int force_change)
2724 struct md_rdev *rdev;
2727 int any_badblocks_changed = 0;
2730 if (!md_is_rdwr(mddev)) {
2732 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2737 if (mddev_is_clustered(mddev)) {
2738 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2740 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2742 ret = md_cluster_ops->metadata_update_start(mddev);
2743 /* Has someone else has updated the sb */
2744 if (!does_sb_need_changing(mddev)) {
2746 md_cluster_ops->metadata_update_cancel(mddev);
2747 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2748 BIT(MD_SB_CHANGE_DEVS) |
2749 BIT(MD_SB_CHANGE_CLEAN));
2755 * First make sure individual recovery_offsets are correct
2756 * curr_resync_completed can only be used during recovery.
2757 * During reshape/resync it might use array-addresses rather
2758 * that device addresses.
2760 rdev_for_each(rdev, mddev) {
2761 if (rdev->raid_disk >= 0 &&
2762 mddev->delta_disks >= 0 &&
2763 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2764 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2765 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2766 !test_bit(Journal, &rdev->flags) &&
2767 !test_bit(In_sync, &rdev->flags) &&
2768 mddev->curr_resync_completed > rdev->recovery_offset)
2769 rdev->recovery_offset = mddev->curr_resync_completed;
2772 if (!mddev->persistent) {
2773 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2774 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2775 if (!mddev->external) {
2776 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2777 rdev_for_each(rdev, mddev) {
2778 if (rdev->badblocks.changed) {
2779 rdev->badblocks.changed = 0;
2780 ack_all_badblocks(&rdev->badblocks);
2781 md_error(mddev, rdev);
2783 clear_bit(Blocked, &rdev->flags);
2784 clear_bit(BlockedBadBlocks, &rdev->flags);
2785 wake_up(&rdev->blocked_wait);
2788 wake_up(&mddev->sb_wait);
2792 spin_lock(&mddev->lock);
2794 mddev->utime = ktime_get_real_seconds();
2796 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2798 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2799 /* just a clean<-> dirty transition, possibly leave spares alone,
2800 * though if events isn't the right even/odd, we will have to do
2806 if (mddev->degraded)
2807 /* If the array is degraded, then skipping spares is both
2808 * dangerous and fairly pointless.
2809 * Dangerous because a device that was removed from the array
2810 * might have a event_count that still looks up-to-date,
2811 * so it can be re-added without a resync.
2812 * Pointless because if there are any spares to skip,
2813 * then a recovery will happen and soon that array won't
2814 * be degraded any more and the spare can go back to sleep then.
2818 sync_req = mddev->in_sync;
2820 /* If this is just a dirty<->clean transition, and the array is clean
2821 * and 'events' is odd, we can roll back to the previous clean state */
2823 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2824 && mddev->can_decrease_events
2825 && mddev->events != 1) {
2827 mddev->can_decrease_events = 0;
2829 /* otherwise we have to go forward and ... */
2831 mddev->can_decrease_events = nospares;
2835 * This 64-bit counter should never wrap.
2836 * Either we are in around ~1 trillion A.C., assuming
2837 * 1 reboot per second, or we have a bug...
2839 WARN_ON(mddev->events == 0);
2841 rdev_for_each(rdev, mddev) {
2842 if (rdev->badblocks.changed)
2843 any_badblocks_changed++;
2844 if (test_bit(Faulty, &rdev->flags))
2845 set_bit(FaultRecorded, &rdev->flags);
2848 sync_sbs(mddev, nospares);
2849 spin_unlock(&mddev->lock);
2851 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2852 mdname(mddev), mddev->in_sync);
2855 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2857 md_bitmap_update_sb(mddev->bitmap);
2858 rdev_for_each(rdev, mddev) {
2859 if (rdev->sb_loaded != 1)
2860 continue; /* no noise on spare devices */
2862 if (!test_bit(Faulty, &rdev->flags)) {
2863 md_super_write(mddev,rdev,
2864 rdev->sb_start, rdev->sb_size,
2866 pr_debug("md: (write) %pg's sb offset: %llu\n",
2868 (unsigned long long)rdev->sb_start);
2869 rdev->sb_events = mddev->events;
2870 if (rdev->badblocks.size) {
2871 md_super_write(mddev, rdev,
2872 rdev->badblocks.sector,
2873 rdev->badblocks.size << 9,
2875 rdev->badblocks.size = 0;
2879 pr_debug("md: %pg (skipping faulty)\n",
2882 if (md_super_wait(mddev) < 0)
2884 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2886 if (mddev_is_clustered(mddev) && ret == 0)
2887 md_cluster_ops->metadata_update_finish(mddev);
2889 if (mddev->in_sync != sync_req ||
2890 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2891 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2892 /* have to write it out again */
2894 wake_up(&mddev->sb_wait);
2895 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2896 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2898 rdev_for_each(rdev, mddev) {
2899 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2900 clear_bit(Blocked, &rdev->flags);
2902 if (any_badblocks_changed)
2903 ack_all_badblocks(&rdev->badblocks);
2904 clear_bit(BlockedBadBlocks, &rdev->flags);
2905 wake_up(&rdev->blocked_wait);
2908 EXPORT_SYMBOL(md_update_sb);
2910 static int add_bound_rdev(struct md_rdev *rdev)
2912 struct mddev *mddev = rdev->mddev;
2914 bool add_journal = test_bit(Journal, &rdev->flags);
2916 if (!mddev->pers->hot_remove_disk || add_journal) {
2917 /* If there is hot_add_disk but no hot_remove_disk
2918 * then added disks for geometry changes,
2919 * and should be added immediately.
2921 super_types[mddev->major_version].
2922 validate_super(mddev, NULL/*freshest*/, rdev);
2923 err = mddev->pers->hot_add_disk(mddev, rdev);
2925 md_kick_rdev_from_array(rdev);
2929 sysfs_notify_dirent_safe(rdev->sysfs_state);
2931 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2932 if (mddev->degraded)
2933 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2934 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2936 md_wakeup_thread(mddev->thread);
2940 /* words written to sysfs files may, or may not, be \n terminated.
2941 * We want to accept with case. For this we use cmd_match.
2943 static int cmd_match(const char *cmd, const char *str)
2945 /* See if cmd, written into a sysfs file, matches
2946 * str. They must either be the same, or cmd can
2947 * have a trailing newline
2949 while (*cmd && *str && *cmd == *str) {
2960 struct rdev_sysfs_entry {
2961 struct attribute attr;
2962 ssize_t (*show)(struct md_rdev *, char *);
2963 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2967 state_show(struct md_rdev *rdev, char *page)
2971 unsigned long flags = READ_ONCE(rdev->flags);
2973 if (test_bit(Faulty, &flags) ||
2974 (!test_bit(ExternalBbl, &flags) &&
2975 rdev->badblocks.unacked_exist))
2976 len += sprintf(page+len, "faulty%s", sep);
2977 if (test_bit(In_sync, &flags))
2978 len += sprintf(page+len, "in_sync%s", sep);
2979 if (test_bit(Journal, &flags))
2980 len += sprintf(page+len, "journal%s", sep);
2981 if (test_bit(WriteMostly, &flags))
2982 len += sprintf(page+len, "write_mostly%s", sep);
2983 if (test_bit(Blocked, &flags) ||
2984 (rdev->badblocks.unacked_exist
2985 && !test_bit(Faulty, &flags)))
2986 len += sprintf(page+len, "blocked%s", sep);
2987 if (!test_bit(Faulty, &flags) &&
2988 !test_bit(Journal, &flags) &&
2989 !test_bit(In_sync, &flags))
2990 len += sprintf(page+len, "spare%s", sep);
2991 if (test_bit(WriteErrorSeen, &flags))
2992 len += sprintf(page+len, "write_error%s", sep);
2993 if (test_bit(WantReplacement, &flags))
2994 len += sprintf(page+len, "want_replacement%s", sep);
2995 if (test_bit(Replacement, &flags))
2996 len += sprintf(page+len, "replacement%s", sep);
2997 if (test_bit(ExternalBbl, &flags))
2998 len += sprintf(page+len, "external_bbl%s", sep);
2999 if (test_bit(FailFast, &flags))
3000 len += sprintf(page+len, "failfast%s", sep);
3005 return len+sprintf(page+len, "\n");
3009 state_store(struct md_rdev *rdev, const char *buf, size_t len)
3012 * faulty - simulates an error
3013 * remove - disconnects the device
3014 * writemostly - sets write_mostly
3015 * -writemostly - clears write_mostly
3016 * blocked - sets the Blocked flags
3017 * -blocked - clears the Blocked and possibly simulates an error
3018 * insync - sets Insync providing device isn't active
3019 * -insync - clear Insync for a device with a slot assigned,
3020 * so that it gets rebuilt based on bitmap
3021 * write_error - sets WriteErrorSeen
3022 * -write_error - clears WriteErrorSeen
3023 * {,-}failfast - set/clear FailFast
3026 struct mddev *mddev = rdev->mddev;
3028 bool need_update_sb = false;
3030 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
3031 md_error(rdev->mddev, rdev);
3033 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
3037 } else if (cmd_match(buf, "remove")) {
3038 if (rdev->mddev->pers) {
3039 clear_bit(Blocked, &rdev->flags);
3040 remove_and_add_spares(rdev->mddev, rdev);
3042 if (rdev->raid_disk >= 0)
3046 if (mddev_is_clustered(mddev))
3047 err = md_cluster_ops->remove_disk(mddev, rdev);
3050 md_kick_rdev_from_array(rdev);
3052 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3053 md_wakeup_thread(mddev->thread);
3058 } else if (cmd_match(buf, "writemostly")) {
3059 set_bit(WriteMostly, &rdev->flags);
3060 mddev_create_serial_pool(rdev->mddev, rdev);
3061 need_update_sb = true;
3063 } else if (cmd_match(buf, "-writemostly")) {
3064 mddev_destroy_serial_pool(rdev->mddev, rdev);
3065 clear_bit(WriteMostly, &rdev->flags);
3066 need_update_sb = true;
3068 } else if (cmd_match(buf, "blocked")) {
3069 set_bit(Blocked, &rdev->flags);
3071 } else if (cmd_match(buf, "-blocked")) {
3072 if (!test_bit(Faulty, &rdev->flags) &&
3073 !test_bit(ExternalBbl, &rdev->flags) &&
3074 rdev->badblocks.unacked_exist) {
3075 /* metadata handler doesn't understand badblocks,
3076 * so we need to fail the device
3078 md_error(rdev->mddev, rdev);
3080 clear_bit(Blocked, &rdev->flags);
3081 clear_bit(BlockedBadBlocks, &rdev->flags);
3082 wake_up(&rdev->blocked_wait);
3083 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3084 md_wakeup_thread(rdev->mddev->thread);
3087 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3088 set_bit(In_sync, &rdev->flags);
3090 } else if (cmd_match(buf, "failfast")) {
3091 set_bit(FailFast, &rdev->flags);
3092 need_update_sb = true;
3094 } else if (cmd_match(buf, "-failfast")) {
3095 clear_bit(FailFast, &rdev->flags);
3096 need_update_sb = true;
3098 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3099 !test_bit(Journal, &rdev->flags)) {
3100 if (rdev->mddev->pers == NULL) {
3101 clear_bit(In_sync, &rdev->flags);
3102 rdev->saved_raid_disk = rdev->raid_disk;
3103 rdev->raid_disk = -1;
3106 } else if (cmd_match(buf, "write_error")) {
3107 set_bit(WriteErrorSeen, &rdev->flags);
3109 } else if (cmd_match(buf, "-write_error")) {
3110 clear_bit(WriteErrorSeen, &rdev->flags);
3112 } else if (cmd_match(buf, "want_replacement")) {
3113 /* Any non-spare device that is not a replacement can
3114 * become want_replacement at any time, but we then need to
3115 * check if recovery is needed.
3117 if (rdev->raid_disk >= 0 &&
3118 !test_bit(Journal, &rdev->flags) &&
3119 !test_bit(Replacement, &rdev->flags))
3120 set_bit(WantReplacement, &rdev->flags);
3121 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3122 md_wakeup_thread(rdev->mddev->thread);
3124 } else if (cmd_match(buf, "-want_replacement")) {
3125 /* Clearing 'want_replacement' is always allowed.
3126 * Once replacements starts it is too late though.
3129 clear_bit(WantReplacement, &rdev->flags);
3130 } else if (cmd_match(buf, "replacement")) {
3131 /* Can only set a device as a replacement when array has not
3132 * yet been started. Once running, replacement is automatic
3133 * from spares, or by assigning 'slot'.
3135 if (rdev->mddev->pers)
3138 set_bit(Replacement, &rdev->flags);
3141 } else if (cmd_match(buf, "-replacement")) {
3142 /* Similarly, can only clear Replacement before start */
3143 if (rdev->mddev->pers)
3146 clear_bit(Replacement, &rdev->flags);
3149 } else if (cmd_match(buf, "re-add")) {
3150 if (!rdev->mddev->pers)
3152 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3153 rdev->saved_raid_disk >= 0) {
3154 /* clear_bit is performed _after_ all the devices
3155 * have their local Faulty bit cleared. If any writes
3156 * happen in the meantime in the local node, they
3157 * will land in the local bitmap, which will be synced
3158 * by this node eventually
3160 if (!mddev_is_clustered(rdev->mddev) ||
3161 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3162 clear_bit(Faulty, &rdev->flags);
3163 err = add_bound_rdev(rdev);
3167 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3168 set_bit(ExternalBbl, &rdev->flags);
3169 rdev->badblocks.shift = 0;
3171 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3172 clear_bit(ExternalBbl, &rdev->flags);
3176 md_update_sb(mddev, 1);
3178 sysfs_notify_dirent_safe(rdev->sysfs_state);
3179 return err ? err : len;
3181 static struct rdev_sysfs_entry rdev_state =
3182 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3185 errors_show(struct md_rdev *rdev, char *page)
3187 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3191 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3196 rv = kstrtouint(buf, 10, &n);
3199 atomic_set(&rdev->corrected_errors, n);
3202 static struct rdev_sysfs_entry rdev_errors =
3203 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3206 slot_show(struct md_rdev *rdev, char *page)
3208 if (test_bit(Journal, &rdev->flags))
3209 return sprintf(page, "journal\n");
3210 else if (rdev->raid_disk < 0)
3211 return sprintf(page, "none\n");
3213 return sprintf(page, "%d\n", rdev->raid_disk);
3217 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3222 if (test_bit(Journal, &rdev->flags))
3224 if (strncmp(buf, "none", 4)==0)
3227 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3234 if (rdev->mddev->pers && slot == -1) {
3235 /* Setting 'slot' on an active array requires also
3236 * updating the 'rd%d' link, and communicating
3237 * with the personality with ->hot_*_disk.
3238 * For now we only support removing
3239 * failed/spare devices. This normally happens automatically,
3240 * but not when the metadata is externally managed.
3242 if (rdev->raid_disk == -1)
3244 /* personality does all needed checks */
3245 if (rdev->mddev->pers->hot_remove_disk == NULL)
3247 clear_bit(Blocked, &rdev->flags);
3248 remove_and_add_spares(rdev->mddev, rdev);
3249 if (rdev->raid_disk >= 0)
3251 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3252 md_wakeup_thread(rdev->mddev->thread);
3253 } else if (rdev->mddev->pers) {
3254 /* Activating a spare .. or possibly reactivating
3255 * if we ever get bitmaps working here.
3259 if (rdev->raid_disk != -1)
3262 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3265 if (rdev->mddev->pers->hot_add_disk == NULL)
3268 if (slot >= rdev->mddev->raid_disks &&
3269 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3272 rdev->raid_disk = slot;
3273 if (test_bit(In_sync, &rdev->flags))
3274 rdev->saved_raid_disk = slot;
3276 rdev->saved_raid_disk = -1;
3277 clear_bit(In_sync, &rdev->flags);
3278 clear_bit(Bitmap_sync, &rdev->flags);
3279 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3281 rdev->raid_disk = -1;
3284 sysfs_notify_dirent_safe(rdev->sysfs_state);
3285 /* failure here is OK */;
3286 sysfs_link_rdev(rdev->mddev, rdev);
3287 /* don't wakeup anyone, leave that to userspace. */
3289 if (slot >= rdev->mddev->raid_disks &&
3290 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3292 rdev->raid_disk = slot;
3293 /* assume it is working */
3294 clear_bit(Faulty, &rdev->flags);
3295 clear_bit(WriteMostly, &rdev->flags);
3296 set_bit(In_sync, &rdev->flags);
3297 sysfs_notify_dirent_safe(rdev->sysfs_state);
3302 static struct rdev_sysfs_entry rdev_slot =
3303 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3306 offset_show(struct md_rdev *rdev, char *page)
3308 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3312 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3314 unsigned long long offset;
3315 if (kstrtoull(buf, 10, &offset) < 0)
3317 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3319 if (rdev->sectors && rdev->mddev->external)
3320 /* Must set offset before size, so overlap checks
3323 rdev->data_offset = offset;
3324 rdev->new_data_offset = offset;
3328 static struct rdev_sysfs_entry rdev_offset =
3329 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3331 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3333 return sprintf(page, "%llu\n",
3334 (unsigned long long)rdev->new_data_offset);
3337 static ssize_t new_offset_store(struct md_rdev *rdev,
3338 const char *buf, size_t len)
3340 unsigned long long new_offset;
3341 struct mddev *mddev = rdev->mddev;
3343 if (kstrtoull(buf, 10, &new_offset) < 0)
3346 if (mddev->sync_thread ||
3347 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3349 if (new_offset == rdev->data_offset)
3350 /* reset is always permitted */
3352 else if (new_offset > rdev->data_offset) {
3353 /* must not push array size beyond rdev_sectors */
3354 if (new_offset - rdev->data_offset
3355 + mddev->dev_sectors > rdev->sectors)
3358 /* Metadata worries about other space details. */
3360 /* decreasing the offset is inconsistent with a backwards
3363 if (new_offset < rdev->data_offset &&
3364 mddev->reshape_backwards)
3366 /* Increasing offset is inconsistent with forwards
3367 * reshape. reshape_direction should be set to
3368 * 'backwards' first.
3370 if (new_offset > rdev->data_offset &&
3371 !mddev->reshape_backwards)
3374 if (mddev->pers && mddev->persistent &&
3375 !super_types[mddev->major_version]
3376 .allow_new_offset(rdev, new_offset))
3378 rdev->new_data_offset = new_offset;
3379 if (new_offset > rdev->data_offset)
3380 mddev->reshape_backwards = 1;
3381 else if (new_offset < rdev->data_offset)
3382 mddev->reshape_backwards = 0;
3386 static struct rdev_sysfs_entry rdev_new_offset =
3387 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3390 rdev_size_show(struct md_rdev *rdev, char *page)
3392 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3395 static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
3397 /* check if two start/length pairs overlap */
3398 if (a->data_offset + a->sectors <= b->data_offset)
3400 if (b->data_offset + b->sectors <= a->data_offset)
3405 static bool md_rdev_overlaps(struct md_rdev *rdev)
3407 struct mddev *mddev;
3408 struct md_rdev *rdev2;
3410 spin_lock(&all_mddevs_lock);
3411 list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
3412 if (test_bit(MD_DELETED, &mddev->flags))
3414 rdev_for_each(rdev2, mddev) {
3415 if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
3416 md_rdevs_overlap(rdev, rdev2)) {
3417 spin_unlock(&all_mddevs_lock);
3422 spin_unlock(&all_mddevs_lock);
3426 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3428 unsigned long long blocks;
3431 if (kstrtoull(buf, 10, &blocks) < 0)
3434 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3435 return -EINVAL; /* sector conversion overflow */
3438 if (new != blocks * 2)
3439 return -EINVAL; /* unsigned long long to sector_t overflow */
3446 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3448 struct mddev *my_mddev = rdev->mddev;
3449 sector_t oldsectors = rdev->sectors;
3452 if (test_bit(Journal, &rdev->flags))
3454 if (strict_blocks_to_sectors(buf, §ors) < 0)
3456 if (rdev->data_offset != rdev->new_data_offset)
3457 return -EINVAL; /* too confusing */
3458 if (my_mddev->pers && rdev->raid_disk >= 0) {
3459 if (my_mddev->persistent) {
3460 sectors = super_types[my_mddev->major_version].
3461 rdev_size_change(rdev, sectors);
3464 } else if (!sectors)
3465 sectors = bdev_nr_sectors(rdev->bdev) -
3467 if (!my_mddev->pers->resize)
3468 /* Cannot change size for RAID0 or Linear etc */
3471 if (sectors < my_mddev->dev_sectors)
3472 return -EINVAL; /* component must fit device */
3474 rdev->sectors = sectors;
3477 * Check that all other rdevs with the same bdev do not overlap. This
3478 * check does not provide a hard guarantee, it just helps avoid
3479 * dangerous mistakes.
3481 if (sectors > oldsectors && my_mddev->external &&
3482 md_rdev_overlaps(rdev)) {
3484 * Someone else could have slipped in a size change here, but
3485 * doing so is just silly. We put oldsectors back because we
3486 * know it is safe, and trust userspace not to race with itself.
3488 rdev->sectors = oldsectors;
3494 static struct rdev_sysfs_entry rdev_size =
3495 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3497 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3499 unsigned long long recovery_start = rdev->recovery_offset;
3501 if (test_bit(In_sync, &rdev->flags) ||
3502 recovery_start == MaxSector)
3503 return sprintf(page, "none\n");
3505 return sprintf(page, "%llu\n", recovery_start);
3508 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3510 unsigned long long recovery_start;
3512 if (cmd_match(buf, "none"))
3513 recovery_start = MaxSector;
3514 else if (kstrtoull(buf, 10, &recovery_start))
3517 if (rdev->mddev->pers &&
3518 rdev->raid_disk >= 0)
3521 rdev->recovery_offset = recovery_start;
3522 if (recovery_start == MaxSector)
3523 set_bit(In_sync, &rdev->flags);
3525 clear_bit(In_sync, &rdev->flags);
3529 static struct rdev_sysfs_entry rdev_recovery_start =
3530 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3532 /* sysfs access to bad-blocks list.
3533 * We present two files.
3534 * 'bad-blocks' lists sector numbers and lengths of ranges that
3535 * are recorded as bad. The list is truncated to fit within
3536 * the one-page limit of sysfs.
3537 * Writing "sector length" to this file adds an acknowledged
3539 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3540 * been acknowledged. Writing to this file adds bad blocks
3541 * without acknowledging them. This is largely for testing.
3543 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3545 return badblocks_show(&rdev->badblocks, page, 0);
3547 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3549 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3550 /* Maybe that ack was all we needed */
3551 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3552 wake_up(&rdev->blocked_wait);
3555 static struct rdev_sysfs_entry rdev_bad_blocks =
3556 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3558 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3560 return badblocks_show(&rdev->badblocks, page, 1);
3562 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3564 return badblocks_store(&rdev->badblocks, page, len, 1);
3566 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3567 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3570 ppl_sector_show(struct md_rdev *rdev, char *page)
3572 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3576 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3578 unsigned long long sector;
3580 if (kstrtoull(buf, 10, §or) < 0)
3582 if (sector != (sector_t)sector)
3585 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3586 rdev->raid_disk >= 0)
3589 if (rdev->mddev->persistent) {
3590 if (rdev->mddev->major_version == 0)
3592 if ((sector > rdev->sb_start &&
3593 sector - rdev->sb_start > S16_MAX) ||
3594 (sector < rdev->sb_start &&
3595 rdev->sb_start - sector > -S16_MIN))
3597 rdev->ppl.offset = sector - rdev->sb_start;
3598 } else if (!rdev->mddev->external) {
3601 rdev->ppl.sector = sector;
3605 static struct rdev_sysfs_entry rdev_ppl_sector =
3606 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3609 ppl_size_show(struct md_rdev *rdev, char *page)
3611 return sprintf(page, "%u\n", rdev->ppl.size);
3615 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3619 if (kstrtouint(buf, 10, &size) < 0)
3622 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3623 rdev->raid_disk >= 0)
3626 if (rdev->mddev->persistent) {
3627 if (rdev->mddev->major_version == 0)
3631 } else if (!rdev->mddev->external) {
3634 rdev->ppl.size = size;
3638 static struct rdev_sysfs_entry rdev_ppl_size =
3639 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3641 static struct attribute *rdev_default_attrs[] = {
3646 &rdev_new_offset.attr,
3648 &rdev_recovery_start.attr,
3649 &rdev_bad_blocks.attr,
3650 &rdev_unack_bad_blocks.attr,
3651 &rdev_ppl_sector.attr,
3652 &rdev_ppl_size.attr,
3655 ATTRIBUTE_GROUPS(rdev_default);
3657 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3659 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3660 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3666 return entry->show(rdev, page);
3670 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3671 const char *page, size_t length)
3673 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3674 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3675 struct kernfs_node *kn = NULL;
3676 bool suspend = false;
3678 struct mddev *mddev = rdev->mddev;
3682 if (!capable(CAP_SYS_ADMIN))
3687 if (entry->store == state_store) {
3688 if (cmd_match(page, "remove"))
3689 kn = sysfs_break_active_protection(kobj, attr);
3690 if (cmd_match(page, "remove") || cmd_match(page, "re-add") ||
3691 cmd_match(page, "writemostly") ||
3692 cmd_match(page, "-writemostly"))
3696 rv = suspend ? mddev_suspend_and_lock(mddev) : mddev_lock(mddev);
3698 if (rdev->mddev == NULL)
3701 rv = entry->store(rdev, page, length);
3702 suspend ? mddev_unlock_and_resume(mddev) : mddev_unlock(mddev);
3706 sysfs_unbreak_active_protection(kn);
3711 static void rdev_free(struct kobject *ko)
3713 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3716 static const struct sysfs_ops rdev_sysfs_ops = {
3717 .show = rdev_attr_show,
3718 .store = rdev_attr_store,
3720 static const struct kobj_type rdev_ktype = {
3721 .release = rdev_free,
3722 .sysfs_ops = &rdev_sysfs_ops,
3723 .default_groups = rdev_default_groups,
3726 int md_rdev_init(struct md_rdev *rdev)
3729 rdev->saved_raid_disk = -1;
3730 rdev->raid_disk = -1;
3732 rdev->data_offset = 0;
3733 rdev->new_data_offset = 0;
3734 rdev->sb_events = 0;
3735 rdev->last_read_error = 0;
3736 rdev->sb_loaded = 0;
3737 rdev->bb_page = NULL;
3738 atomic_set(&rdev->nr_pending, 0);
3739 atomic_set(&rdev->read_errors, 0);
3740 atomic_set(&rdev->corrected_errors, 0);
3742 INIT_LIST_HEAD(&rdev->same_set);
3743 init_waitqueue_head(&rdev->blocked_wait);
3745 /* Add space to store bad block list.
3746 * This reserves the space even on arrays where it cannot
3747 * be used - I wonder if that matters
3749 return badblocks_init(&rdev->badblocks, 0);
3751 EXPORT_SYMBOL_GPL(md_rdev_init);
3754 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3756 * mark the device faulty if:
3758 * - the device is nonexistent (zero size)
3759 * - the device has no valid superblock
3761 * a faulty rdev _never_ has rdev->sb set.
3763 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3765 struct md_rdev *rdev;
3769 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3771 return ERR_PTR(-ENOMEM);
3773 err = md_rdev_init(rdev);
3776 err = alloc_disk_sb(rdev);
3778 goto out_clear_rdev;
3780 rdev->bdev_file = bdev_file_open_by_dev(newdev,
3781 BLK_OPEN_READ | BLK_OPEN_WRITE,
3782 super_format == -2 ? &claim_rdev : rdev, NULL);
3783 if (IS_ERR(rdev->bdev_file)) {
3784 pr_warn("md: could not open device unknown-block(%u,%u).\n",
3785 MAJOR(newdev), MINOR(newdev));
3786 err = PTR_ERR(rdev->bdev_file);
3787 goto out_clear_rdev;
3789 rdev->bdev = file_bdev(rdev->bdev_file);
3791 kobject_init(&rdev->kobj, &rdev_ktype);
3793 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3795 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3798 goto out_blkdev_put;
3801 if (super_format >= 0) {
3802 err = super_types[super_format].
3803 load_super(rdev, NULL, super_minor);
3804 if (err == -EINVAL) {
3805 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3807 super_format, super_minor);
3808 goto out_blkdev_put;
3811 pr_warn("md: could not read %pg's sb, not importing!\n",
3813 goto out_blkdev_put;
3820 fput(rdev->bdev_file);
3822 md_rdev_clear(rdev);
3825 return ERR_PTR(err);
3829 * Check a full RAID array for plausibility
3832 static int analyze_sbs(struct mddev *mddev)
3835 struct md_rdev *rdev, *freshest, *tmp;
3838 rdev_for_each_safe(rdev, tmp, mddev)
3839 switch (super_types[mddev->major_version].
3840 load_super(rdev, freshest, mddev->minor_version)) {
3847 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3849 md_kick_rdev_from_array(rdev);
3852 /* Cannot find a valid fresh disk */
3854 pr_warn("md: cannot find a valid disk\n");
3858 super_types[mddev->major_version].
3859 validate_super(mddev, NULL/*freshest*/, freshest);
3862 rdev_for_each_safe(rdev, tmp, mddev) {
3863 if (mddev->max_disks &&
3864 (rdev->desc_nr >= mddev->max_disks ||
3865 i > mddev->max_disks)) {
3866 pr_warn("md: %s: %pg: only %d devices permitted\n",
3867 mdname(mddev), rdev->bdev,
3869 md_kick_rdev_from_array(rdev);
3872 if (rdev != freshest) {
3873 if (super_types[mddev->major_version].
3874 validate_super(mddev, freshest, rdev)) {
3875 pr_warn("md: kicking non-fresh %pg from array!\n",
3877 md_kick_rdev_from_array(rdev);
3881 if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3882 !test_bit(Journal, &rdev->flags)) {
3883 rdev->raid_disk = -1;
3884 clear_bit(In_sync, &rdev->flags);
3891 /* Read a fixed-point number.
3892 * Numbers in sysfs attributes should be in "standard" units where
3893 * possible, so time should be in seconds.
3894 * However we internally use a a much smaller unit such as
3895 * milliseconds or jiffies.
3896 * This function takes a decimal number with a possible fractional
3897 * component, and produces an integer which is the result of
3898 * multiplying that number by 10^'scale'.
3899 * all without any floating-point arithmetic.
3901 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3903 unsigned long result = 0;
3905 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3908 else if (decimals < scale) {
3911 result = result * 10 + value;
3923 *res = result * int_pow(10, scale - decimals);
3928 safe_delay_show(struct mddev *mddev, char *page)
3930 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3932 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3935 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3939 if (mddev_is_clustered(mddev)) {
3940 pr_warn("md: Safemode is disabled for clustered mode\n");
3944 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3947 mddev->safemode_delay = 0;
3949 unsigned long old_delay = mddev->safemode_delay;
3950 unsigned long new_delay = (msec*HZ)/1000;
3954 mddev->safemode_delay = new_delay;
3955 if (new_delay < old_delay || old_delay == 0)
3956 mod_timer(&mddev->safemode_timer, jiffies+1);
3960 static struct md_sysfs_entry md_safe_delay =
3961 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3964 level_show(struct mddev *mddev, char *page)
3966 struct md_personality *p;
3968 spin_lock(&mddev->lock);
3971 ret = sprintf(page, "%s\n", p->name);
3972 else if (mddev->clevel[0])
3973 ret = sprintf(page, "%s\n", mddev->clevel);
3974 else if (mddev->level != LEVEL_NONE)
3975 ret = sprintf(page, "%d\n", mddev->level);
3978 spin_unlock(&mddev->lock);
3983 level_store(struct mddev *mddev, const char *buf, size_t len)
3988 struct md_personality *pers, *oldpers;
3990 void *priv, *oldpriv;
3991 struct md_rdev *rdev;
3993 if (slen == 0 || slen >= sizeof(clevel))
3996 rv = mddev_suspend_and_lock(mddev);
4000 if (mddev->pers == NULL) {
4001 memcpy(mddev->clevel, buf, slen);
4002 if (mddev->clevel[slen-1] == '\n')
4004 mddev->clevel[slen] = 0;
4005 mddev->level = LEVEL_NONE;
4010 if (!md_is_rdwr(mddev))
4013 /* request to change the personality. Need to ensure:
4014 * - array is not engaged in resync/recovery/reshape
4015 * - old personality can be suspended
4016 * - new personality will access other array.
4020 if (mddev->sync_thread ||
4021 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4022 mddev->reshape_position != MaxSector ||
4023 mddev->sysfs_active)
4027 if (!mddev->pers->quiesce) {
4028 pr_warn("md: %s: %s does not support online personality change\n",
4029 mdname(mddev), mddev->pers->name);
4033 /* Now find the new personality */
4034 memcpy(clevel, buf, slen);
4035 if (clevel[slen-1] == '\n')
4038 if (kstrtol(clevel, 10, &level))
4041 if (request_module("md-%s", clevel) != 0)
4042 request_module("md-level-%s", clevel);
4043 spin_lock(&pers_lock);
4044 pers = find_pers(level, clevel);
4045 if (!pers || !try_module_get(pers->owner)) {
4046 spin_unlock(&pers_lock);
4047 pr_warn("md: personality %s not loaded\n", clevel);
4051 spin_unlock(&pers_lock);
4053 if (pers == mddev->pers) {
4054 /* Nothing to do! */
4055 module_put(pers->owner);
4059 if (!pers->takeover) {
4060 module_put(pers->owner);
4061 pr_warn("md: %s: %s does not support personality takeover\n",
4062 mdname(mddev), clevel);
4067 rdev_for_each(rdev, mddev)
4068 rdev->new_raid_disk = rdev->raid_disk;
4070 /* ->takeover must set new_* and/or delta_disks
4071 * if it succeeds, and may set them when it fails.
4073 priv = pers->takeover(mddev);
4075 mddev->new_level = mddev->level;
4076 mddev->new_layout = mddev->layout;
4077 mddev->new_chunk_sectors = mddev->chunk_sectors;
4078 mddev->raid_disks -= mddev->delta_disks;
4079 mddev->delta_disks = 0;
4080 mddev->reshape_backwards = 0;
4081 module_put(pers->owner);
4082 pr_warn("md: %s: %s would not accept array\n",
4083 mdname(mddev), clevel);
4088 /* Looks like we have a winner */
4089 mddev_detach(mddev);
4091 spin_lock(&mddev->lock);
4092 oldpers = mddev->pers;
4093 oldpriv = mddev->private;
4095 mddev->private = priv;
4096 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4097 mddev->level = mddev->new_level;
4098 mddev->layout = mddev->new_layout;
4099 mddev->chunk_sectors = mddev->new_chunk_sectors;
4100 mddev->delta_disks = 0;
4101 mddev->reshape_backwards = 0;
4102 mddev->degraded = 0;
4103 spin_unlock(&mddev->lock);
4105 if (oldpers->sync_request == NULL &&
4107 /* We are converting from a no-redundancy array
4108 * to a redundancy array and metadata is managed
4109 * externally so we need to be sure that writes
4110 * won't block due to a need to transition
4112 * until external management is started.
4115 mddev->safemode_delay = 0;
4116 mddev->safemode = 0;
4119 oldpers->free(mddev, oldpriv);
4121 if (oldpers->sync_request == NULL &&
4122 pers->sync_request != NULL) {
4123 /* need to add the md_redundancy_group */
4124 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4125 pr_warn("md: cannot register extra attributes for %s\n",
4127 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4128 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4129 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4131 if (oldpers->sync_request != NULL &&
4132 pers->sync_request == NULL) {
4133 /* need to remove the md_redundancy_group */
4134 if (mddev->to_remove == NULL)
4135 mddev->to_remove = &md_redundancy_group;
4138 module_put(oldpers->owner);
4140 rdev_for_each(rdev, mddev) {
4141 if (rdev->raid_disk < 0)
4143 if (rdev->new_raid_disk >= mddev->raid_disks)
4144 rdev->new_raid_disk = -1;
4145 if (rdev->new_raid_disk == rdev->raid_disk)
4147 sysfs_unlink_rdev(mddev, rdev);
4149 rdev_for_each(rdev, mddev) {
4150 if (rdev->raid_disk < 0)
4152 if (rdev->new_raid_disk == rdev->raid_disk)
4154 rdev->raid_disk = rdev->new_raid_disk;
4155 if (rdev->raid_disk < 0)
4156 clear_bit(In_sync, &rdev->flags);
4158 if (sysfs_link_rdev(mddev, rdev))
4159 pr_warn("md: cannot register rd%d for %s after level change\n",
4160 rdev->raid_disk, mdname(mddev));
4164 if (pers->sync_request == NULL) {
4165 /* this is now an array without redundancy, so
4166 * it must always be in_sync
4169 del_timer_sync(&mddev->safemode_timer);
4171 blk_set_stacking_limits(&mddev->queue->limits);
4173 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4175 md_update_sb(mddev, 1);
4176 sysfs_notify_dirent_safe(mddev->sysfs_level);
4180 mddev_unlock_and_resume(mddev);
4184 static struct md_sysfs_entry md_level =
4185 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4188 layout_show(struct mddev *mddev, char *page)
4190 /* just a number, not meaningful for all levels */
4191 if (mddev->reshape_position != MaxSector &&
4192 mddev->layout != mddev->new_layout)
4193 return sprintf(page, "%d (%d)\n",
4194 mddev->new_layout, mddev->layout);
4195 return sprintf(page, "%d\n", mddev->layout);
4199 layout_store(struct mddev *mddev, const char *buf, size_t len)
4204 err = kstrtouint(buf, 10, &n);
4207 err = mddev_lock(mddev);
4212 if (mddev->pers->check_reshape == NULL)
4214 else if (!md_is_rdwr(mddev))
4217 mddev->new_layout = n;
4218 err = mddev->pers->check_reshape(mddev);
4220 mddev->new_layout = mddev->layout;
4223 mddev->new_layout = n;
4224 if (mddev->reshape_position == MaxSector)
4227 mddev_unlock(mddev);
4230 static struct md_sysfs_entry md_layout =
4231 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4234 raid_disks_show(struct mddev *mddev, char *page)
4236 if (mddev->raid_disks == 0)
4238 if (mddev->reshape_position != MaxSector &&
4239 mddev->delta_disks != 0)
4240 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4241 mddev->raid_disks - mddev->delta_disks);
4242 return sprintf(page, "%d\n", mddev->raid_disks);
4245 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4248 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4253 err = kstrtouint(buf, 10, &n);
4257 err = mddev_lock(mddev);
4261 err = update_raid_disks(mddev, n);
4262 else if (mddev->reshape_position != MaxSector) {
4263 struct md_rdev *rdev;
4264 int olddisks = mddev->raid_disks - mddev->delta_disks;
4267 rdev_for_each(rdev, mddev) {
4269 rdev->data_offset < rdev->new_data_offset)
4272 rdev->data_offset > rdev->new_data_offset)
4276 mddev->delta_disks = n - olddisks;
4277 mddev->raid_disks = n;
4278 mddev->reshape_backwards = (mddev->delta_disks < 0);
4280 mddev->raid_disks = n;
4282 mddev_unlock(mddev);
4283 return err ? err : len;
4285 static struct md_sysfs_entry md_raid_disks =
4286 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4289 uuid_show(struct mddev *mddev, char *page)
4291 return sprintf(page, "%pU\n", mddev->uuid);
4293 static struct md_sysfs_entry md_uuid =
4294 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4297 chunk_size_show(struct mddev *mddev, char *page)
4299 if (mddev->reshape_position != MaxSector &&
4300 mddev->chunk_sectors != mddev->new_chunk_sectors)
4301 return sprintf(page, "%d (%d)\n",
4302 mddev->new_chunk_sectors << 9,
4303 mddev->chunk_sectors << 9);
4304 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4308 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4313 err = kstrtoul(buf, 10, &n);
4317 err = mddev_lock(mddev);
4321 if (mddev->pers->check_reshape == NULL)
4323 else if (!md_is_rdwr(mddev))
4326 mddev->new_chunk_sectors = n >> 9;
4327 err = mddev->pers->check_reshape(mddev);
4329 mddev->new_chunk_sectors = mddev->chunk_sectors;
4332 mddev->new_chunk_sectors = n >> 9;
4333 if (mddev->reshape_position == MaxSector)
4334 mddev->chunk_sectors = n >> 9;
4336 mddev_unlock(mddev);
4339 static struct md_sysfs_entry md_chunk_size =
4340 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4343 resync_start_show(struct mddev *mddev, char *page)
4345 if (mddev->recovery_cp == MaxSector)
4346 return sprintf(page, "none\n");
4347 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4351 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4353 unsigned long long n;
4356 if (cmd_match(buf, "none"))
4359 err = kstrtoull(buf, 10, &n);
4362 if (n != (sector_t)n)
4366 err = mddev_lock(mddev);
4369 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4373 mddev->recovery_cp = n;
4375 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4377 mddev_unlock(mddev);
4380 static struct md_sysfs_entry md_resync_start =
4381 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4382 resync_start_show, resync_start_store);
4385 * The array state can be:
4388 * No devices, no size, no level
4389 * Equivalent to STOP_ARRAY ioctl
4391 * May have some settings, but array is not active
4392 * all IO results in error
4393 * When written, doesn't tear down array, but just stops it
4394 * suspended (not supported yet)
4395 * All IO requests will block. The array can be reconfigured.
4396 * Writing this, if accepted, will block until array is quiescent
4398 * no resync can happen. no superblocks get written.
4399 * write requests fail
4401 * like readonly, but behaves like 'clean' on a write request.
4403 * clean - no pending writes, but otherwise active.
4404 * When written to inactive array, starts without resync
4405 * If a write request arrives then
4406 * if metadata is known, mark 'dirty' and switch to 'active'.
4407 * if not known, block and switch to write-pending
4408 * If written to an active array that has pending writes, then fails.
4410 * fully active: IO and resync can be happening.
4411 * When written to inactive array, starts with resync
4414 * clean, but writes are blocked waiting for 'active' to be written.
4417 * like active, but no writes have been seen for a while (100msec).
4420 * Array is failed. It's useful because mounted-arrays aren't stopped
4421 * when array is failed, so this state will at least alert the user that
4422 * something is wrong.
4424 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4425 write_pending, active_idle, broken, bad_word};
4426 static char *array_states[] = {
4427 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4428 "write-pending", "active-idle", "broken", NULL };
4430 static int match_word(const char *word, char **list)
4433 for (n=0; list[n]; n++)
4434 if (cmd_match(word, list[n]))
4440 array_state_show(struct mddev *mddev, char *page)
4442 enum array_state st = inactive;
4444 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4453 spin_lock(&mddev->lock);
4454 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4456 else if (mddev->in_sync)
4458 else if (mddev->safemode)
4462 spin_unlock(&mddev->lock);
4465 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4468 if (list_empty(&mddev->disks) &&
4469 mddev->raid_disks == 0 &&
4470 mddev->dev_sectors == 0)
4475 return sprintf(page, "%s\n", array_states[st]);
4478 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4479 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4480 static int restart_array(struct mddev *mddev);
4483 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4486 enum array_state st = match_word(buf, array_states);
4488 /* No lock dependent actions */
4490 case suspended: /* not supported yet */
4491 case write_pending: /* cannot be set */
4492 case active_idle: /* cannot be set */
4493 case broken: /* cannot be set */
4500 if (mddev->pers && (st == active || st == clean) &&
4501 mddev->ro != MD_RDONLY) {
4502 /* don't take reconfig_mutex when toggling between
4505 spin_lock(&mddev->lock);
4507 restart_array(mddev);
4508 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4509 md_wakeup_thread(mddev->thread);
4510 wake_up(&mddev->sb_wait);
4511 } else /* st == clean */ {
4512 restart_array(mddev);
4513 if (!set_in_sync(mddev))
4517 sysfs_notify_dirent_safe(mddev->sysfs_state);
4518 spin_unlock(&mddev->lock);
4521 err = mddev_lock(mddev);
4527 /* stop an active array, return 0 otherwise */
4529 err = do_md_stop(mddev, 2, NULL);
4532 err = do_md_stop(mddev, 0, NULL);
4536 err = md_set_readonly(mddev, NULL);
4538 mddev->ro = MD_RDONLY;
4539 set_disk_ro(mddev->gendisk, 1);
4540 err = do_md_run(mddev);
4545 if (md_is_rdwr(mddev))
4546 err = md_set_readonly(mddev, NULL);
4547 else if (mddev->ro == MD_RDONLY)
4548 err = restart_array(mddev);
4550 mddev->ro = MD_AUTO_READ;
4551 set_disk_ro(mddev->gendisk, 0);
4554 mddev->ro = MD_AUTO_READ;
4555 err = do_md_run(mddev);
4560 err = restart_array(mddev);
4563 spin_lock(&mddev->lock);
4564 if (!set_in_sync(mddev))
4566 spin_unlock(&mddev->lock);
4572 err = restart_array(mddev);
4575 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4576 wake_up(&mddev->sb_wait);
4579 mddev->ro = MD_RDWR;
4580 set_disk_ro(mddev->gendisk, 0);
4581 err = do_md_run(mddev);
4590 if (mddev->hold_active == UNTIL_IOCTL)
4591 mddev->hold_active = 0;
4592 sysfs_notify_dirent_safe(mddev->sysfs_state);
4594 mddev_unlock(mddev);
4597 static struct md_sysfs_entry md_array_state =
4598 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4601 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4602 return sprintf(page, "%d\n",
4603 atomic_read(&mddev->max_corr_read_errors));
4607 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4612 rv = kstrtouint(buf, 10, &n);
4617 atomic_set(&mddev->max_corr_read_errors, n);
4621 static struct md_sysfs_entry max_corr_read_errors =
4622 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4623 max_corrected_read_errors_store);
4626 null_show(struct mddev *mddev, char *page)
4632 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4634 /* buf must be %d:%d\n? giving major and minor numbers */
4635 /* The new device is added to the array.
4636 * If the array has a persistent superblock, we read the
4637 * superblock to initialise info and check validity.
4638 * Otherwise, only checking done is that in bind_rdev_to_array,
4639 * which mainly checks size.
4642 int major = simple_strtoul(buf, &e, 10);
4645 struct md_rdev *rdev;
4648 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4650 minor = simple_strtoul(e+1, &e, 10);
4651 if (*e && *e != '\n')
4653 dev = MKDEV(major, minor);
4654 if (major != MAJOR(dev) ||
4655 minor != MINOR(dev))
4658 err = mddev_suspend_and_lock(mddev);
4661 if (mddev->persistent) {
4662 rdev = md_import_device(dev, mddev->major_version,
4663 mddev->minor_version);
4664 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4665 struct md_rdev *rdev0
4666 = list_entry(mddev->disks.next,
4667 struct md_rdev, same_set);
4668 err = super_types[mddev->major_version]
4669 .load_super(rdev, rdev0, mddev->minor_version);
4673 } else if (mddev->external)
4674 rdev = md_import_device(dev, -2, -1);
4676 rdev = md_import_device(dev, -1, -1);
4679 mddev_unlock_and_resume(mddev);
4680 return PTR_ERR(rdev);
4682 err = bind_rdev_to_array(rdev, mddev);
4685 export_rdev(rdev, mddev);
4686 mddev_unlock_and_resume(mddev);
4689 return err ? err : len;
4692 static struct md_sysfs_entry md_new_device =
4693 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4696 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4699 unsigned long chunk, end_chunk;
4702 err = mddev_lock(mddev);
4707 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4709 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4710 if (buf == end) break;
4711 if (*end == '-') { /* range */
4713 end_chunk = simple_strtoul(buf, &end, 0);
4714 if (buf == end) break;
4716 if (*end && !isspace(*end)) break;
4717 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4718 buf = skip_spaces(end);
4720 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4722 mddev_unlock(mddev);
4726 static struct md_sysfs_entry md_bitmap =
4727 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4730 size_show(struct mddev *mddev, char *page)
4732 return sprintf(page, "%llu\n",
4733 (unsigned long long)mddev->dev_sectors / 2);
4736 static int update_size(struct mddev *mddev, sector_t num_sectors);
4739 size_store(struct mddev *mddev, const char *buf, size_t len)
4741 /* If array is inactive, we can reduce the component size, but
4742 * not increase it (except from 0).
4743 * If array is active, we can try an on-line resize
4746 int err = strict_blocks_to_sectors(buf, §ors);
4750 err = mddev_lock(mddev);
4754 err = update_size(mddev, sectors);
4756 md_update_sb(mddev, 1);
4758 if (mddev->dev_sectors == 0 ||
4759 mddev->dev_sectors > sectors)
4760 mddev->dev_sectors = sectors;
4764 mddev_unlock(mddev);
4765 return err ? err : len;
4768 static struct md_sysfs_entry md_size =
4769 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4771 /* Metadata version.
4773 * 'none' for arrays with no metadata (good luck...)
4774 * 'external' for arrays with externally managed metadata,
4775 * or N.M for internally known formats
4778 metadata_show(struct mddev *mddev, char *page)
4780 if (mddev->persistent)
4781 return sprintf(page, "%d.%d\n",
4782 mddev->major_version, mddev->minor_version);
4783 else if (mddev->external)
4784 return sprintf(page, "external:%s\n", mddev->metadata_type);
4786 return sprintf(page, "none\n");
4790 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4795 /* Changing the details of 'external' metadata is
4796 * always permitted. Otherwise there must be
4797 * no devices attached to the array.
4800 err = mddev_lock(mddev);
4804 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4806 else if (!list_empty(&mddev->disks))
4810 if (cmd_match(buf, "none")) {
4811 mddev->persistent = 0;
4812 mddev->external = 0;
4813 mddev->major_version = 0;
4814 mddev->minor_version = 90;
4817 if (strncmp(buf, "external:", 9) == 0) {
4818 size_t namelen = len-9;
4819 if (namelen >= sizeof(mddev->metadata_type))
4820 namelen = sizeof(mddev->metadata_type)-1;
4821 memcpy(mddev->metadata_type, buf+9, namelen);
4822 mddev->metadata_type[namelen] = 0;
4823 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4824 mddev->metadata_type[--namelen] = 0;
4825 mddev->persistent = 0;
4826 mddev->external = 1;
4827 mddev->major_version = 0;
4828 mddev->minor_version = 90;
4831 major = simple_strtoul(buf, &e, 10);
4833 if (e==buf || *e != '.')
4836 minor = simple_strtoul(buf, &e, 10);
4837 if (e==buf || (*e && *e != '\n') )
4840 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4842 mddev->major_version = major;
4843 mddev->minor_version = minor;
4844 mddev->persistent = 1;
4845 mddev->external = 0;
4848 mddev_unlock(mddev);
4852 static struct md_sysfs_entry md_metadata =
4853 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4856 action_show(struct mddev *mddev, char *page)
4858 char *type = "idle";
4859 unsigned long recovery = mddev->recovery;
4860 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4862 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4863 (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4864 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4866 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4867 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4869 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4873 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4875 else if (mddev->reshape_position != MaxSector)
4878 return sprintf(page, "%s\n", type);
4882 * stop_sync_thread() - wait for sync_thread to stop if it's running.
4883 * @mddev: the array.
4884 * @locked: if set, reconfig_mutex will still be held after this function
4885 * return; if not set, reconfig_mutex will be released after this
4887 * @check_seq: if set, only wait for curent running sync_thread to stop, noted
4888 * that new sync_thread can still start.
4890 static void stop_sync_thread(struct mddev *mddev, bool locked, bool check_seq)
4895 sync_seq = atomic_read(&mddev->sync_seq);
4897 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4899 mddev_unlock(mddev);
4903 mddev_unlock(mddev);
4905 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4907 * Thread might be blocked waiting for metadata update which will now
4910 md_wakeup_thread_directly(mddev->sync_thread);
4911 if (work_pending(&mddev->sync_work))
4912 flush_work(&mddev->sync_work);
4914 wait_event(resync_wait,
4915 !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4916 (check_seq && sync_seq != atomic_read(&mddev->sync_seq)));
4919 mddev_lock_nointr(mddev);
4922 static void idle_sync_thread(struct mddev *mddev)
4924 mutex_lock(&mddev->sync_mutex);
4925 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4927 if (mddev_lock(mddev)) {
4928 mutex_unlock(&mddev->sync_mutex);
4932 stop_sync_thread(mddev, false, true);
4933 mutex_unlock(&mddev->sync_mutex);
4936 static void frozen_sync_thread(struct mddev *mddev)
4938 mutex_lock(&mddev->sync_mutex);
4939 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4941 if (mddev_lock(mddev)) {
4942 mutex_unlock(&mddev->sync_mutex);
4946 stop_sync_thread(mddev, false, false);
4947 mutex_unlock(&mddev->sync_mutex);
4951 action_store(struct mddev *mddev, const char *page, size_t len)
4953 if (!mddev->pers || !mddev->pers->sync_request)
4957 if (cmd_match(page, "idle"))
4958 idle_sync_thread(mddev);
4959 else if (cmd_match(page, "frozen"))
4960 frozen_sync_thread(mddev);
4961 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4963 else if (cmd_match(page, "resync"))
4964 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4965 else if (cmd_match(page, "recover")) {
4966 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4967 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4968 } else if (cmd_match(page, "reshape")) {
4970 if (mddev->pers->start_reshape == NULL)
4972 err = mddev_lock(mddev);
4974 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4976 } else if (mddev->reshape_position == MaxSector ||
4977 mddev->pers->check_reshape == NULL ||
4978 mddev->pers->check_reshape(mddev)) {
4979 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4980 err = mddev->pers->start_reshape(mddev);
4983 * If reshape is still in progress, and
4984 * md_check_recovery() can continue to reshape,
4985 * don't restart reshape because data can be
4986 * corrupted for raid456.
4988 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4990 mddev_unlock(mddev);
4994 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4996 if (cmd_match(page, "check"))
4997 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4998 else if (!cmd_match(page, "repair"))
5000 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5001 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
5002 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5004 if (mddev->ro == MD_AUTO_READ) {
5005 /* A write to sync_action is enough to justify
5006 * canceling read-auto mode
5008 flush_work(&mddev->sync_work);
5009 mddev->ro = MD_RDWR;
5010 md_wakeup_thread(mddev->sync_thread);
5012 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5013 md_wakeup_thread(mddev->thread);
5014 sysfs_notify_dirent_safe(mddev->sysfs_action);
5018 static struct md_sysfs_entry md_scan_mode =
5019 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
5022 last_sync_action_show(struct mddev *mddev, char *page)
5024 return sprintf(page, "%s\n", mddev->last_sync_action);
5027 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
5030 mismatch_cnt_show(struct mddev *mddev, char *page)
5032 return sprintf(page, "%llu\n",
5033 (unsigned long long)
5034 atomic64_read(&mddev->resync_mismatches));
5037 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
5040 sync_min_show(struct mddev *mddev, char *page)
5042 return sprintf(page, "%d (%s)\n", speed_min(mddev),
5043 mddev->sync_speed_min ? "local": "system");
5047 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
5052 if (strncmp(buf, "system", 6)==0) {
5055 rv = kstrtouint(buf, 10, &min);
5061 mddev->sync_speed_min = min;
5065 static struct md_sysfs_entry md_sync_min =
5066 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
5069 sync_max_show(struct mddev *mddev, char *page)
5071 return sprintf(page, "%d (%s)\n", speed_max(mddev),
5072 mddev->sync_speed_max ? "local": "system");
5076 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
5081 if (strncmp(buf, "system", 6)==0) {
5084 rv = kstrtouint(buf, 10, &max);
5090 mddev->sync_speed_max = max;
5094 static struct md_sysfs_entry md_sync_max =
5095 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
5098 degraded_show(struct mddev *mddev, char *page)
5100 return sprintf(page, "%d\n", mddev->degraded);
5102 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
5105 sync_force_parallel_show(struct mddev *mddev, char *page)
5107 return sprintf(page, "%d\n", mddev->parallel_resync);
5111 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
5115 if (kstrtol(buf, 10, &n))
5118 if (n != 0 && n != 1)
5121 mddev->parallel_resync = n;
5123 if (mddev->sync_thread)
5124 wake_up(&resync_wait);
5129 /* force parallel resync, even with shared block devices */
5130 static struct md_sysfs_entry md_sync_force_parallel =
5131 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5132 sync_force_parallel_show, sync_force_parallel_store);
5135 sync_speed_show(struct mddev *mddev, char *page)
5137 unsigned long resync, dt, db;
5138 if (mddev->curr_resync == MD_RESYNC_NONE)
5139 return sprintf(page, "none\n");
5140 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5141 dt = (jiffies - mddev->resync_mark) / HZ;
5143 db = resync - mddev->resync_mark_cnt;
5144 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5147 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5150 sync_completed_show(struct mddev *mddev, char *page)
5152 unsigned long long max_sectors, resync;
5154 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5155 return sprintf(page, "none\n");
5157 if (mddev->curr_resync == MD_RESYNC_YIELDED ||
5158 mddev->curr_resync == MD_RESYNC_DELAYED)
5159 return sprintf(page, "delayed\n");
5161 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5162 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5163 max_sectors = mddev->resync_max_sectors;
5165 max_sectors = mddev->dev_sectors;
5167 resync = mddev->curr_resync_completed;
5168 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5171 static struct md_sysfs_entry md_sync_completed =
5172 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5175 min_sync_show(struct mddev *mddev, char *page)
5177 return sprintf(page, "%llu\n",
5178 (unsigned long long)mddev->resync_min);
5181 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5183 unsigned long long min;
5186 if (kstrtoull(buf, 10, &min))
5189 spin_lock(&mddev->lock);
5191 if (min > mddev->resync_max)
5195 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5198 /* Round down to multiple of 4K for safety */
5199 mddev->resync_min = round_down(min, 8);
5203 spin_unlock(&mddev->lock);
5207 static struct md_sysfs_entry md_min_sync =
5208 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5211 max_sync_show(struct mddev *mddev, char *page)
5213 if (mddev->resync_max == MaxSector)
5214 return sprintf(page, "max\n");
5216 return sprintf(page, "%llu\n",
5217 (unsigned long long)mddev->resync_max);
5220 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5223 spin_lock(&mddev->lock);
5224 if (strncmp(buf, "max", 3) == 0)
5225 mddev->resync_max = MaxSector;
5227 unsigned long long max;
5231 if (kstrtoull(buf, 10, &max))
5233 if (max < mddev->resync_min)
5237 if (max < mddev->resync_max && md_is_rdwr(mddev) &&
5238 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5241 /* Must be a multiple of chunk_size */
5242 chunk = mddev->chunk_sectors;
5244 sector_t temp = max;
5247 if (sector_div(temp, chunk))
5250 mddev->resync_max = max;
5252 wake_up(&mddev->recovery_wait);
5255 spin_unlock(&mddev->lock);
5259 static struct md_sysfs_entry md_max_sync =
5260 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5263 suspend_lo_show(struct mddev *mddev, char *page)
5265 return sprintf(page, "%llu\n",
5266 (unsigned long long)READ_ONCE(mddev->suspend_lo));
5270 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5272 unsigned long long new;
5275 err = kstrtoull(buf, 10, &new);
5278 if (new != (sector_t)new)
5281 err = mddev_suspend(mddev, true);
5285 WRITE_ONCE(mddev->suspend_lo, new);
5286 mddev_resume(mddev);
5290 static struct md_sysfs_entry md_suspend_lo =
5291 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5294 suspend_hi_show(struct mddev *mddev, char *page)
5296 return sprintf(page, "%llu\n",
5297 (unsigned long long)READ_ONCE(mddev->suspend_hi));
5301 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5303 unsigned long long new;
5306 err = kstrtoull(buf, 10, &new);
5309 if (new != (sector_t)new)
5312 err = mddev_suspend(mddev, true);
5316 WRITE_ONCE(mddev->suspend_hi, new);
5317 mddev_resume(mddev);
5321 static struct md_sysfs_entry md_suspend_hi =
5322 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5325 reshape_position_show(struct mddev *mddev, char *page)
5327 if (mddev->reshape_position != MaxSector)
5328 return sprintf(page, "%llu\n",
5329 (unsigned long long)mddev->reshape_position);
5330 strcpy(page, "none\n");
5335 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5337 struct md_rdev *rdev;
5338 unsigned long long new;
5341 err = kstrtoull(buf, 10, &new);
5344 if (new != (sector_t)new)
5346 err = mddev_lock(mddev);
5352 mddev->reshape_position = new;
5353 mddev->delta_disks = 0;
5354 mddev->reshape_backwards = 0;
5355 mddev->new_level = mddev->level;
5356 mddev->new_layout = mddev->layout;
5357 mddev->new_chunk_sectors = mddev->chunk_sectors;
5358 rdev_for_each(rdev, mddev)
5359 rdev->new_data_offset = rdev->data_offset;
5362 mddev_unlock(mddev);
5366 static struct md_sysfs_entry md_reshape_position =
5367 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5368 reshape_position_store);
5371 reshape_direction_show(struct mddev *mddev, char *page)
5373 return sprintf(page, "%s\n",
5374 mddev->reshape_backwards ? "backwards" : "forwards");
5378 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5383 if (cmd_match(buf, "forwards"))
5385 else if (cmd_match(buf, "backwards"))
5389 if (mddev->reshape_backwards == backwards)
5392 err = mddev_lock(mddev);
5395 /* check if we are allowed to change */
5396 if (mddev->delta_disks)
5398 else if (mddev->persistent &&
5399 mddev->major_version == 0)
5402 mddev->reshape_backwards = backwards;
5403 mddev_unlock(mddev);
5407 static struct md_sysfs_entry md_reshape_direction =
5408 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5409 reshape_direction_store);
5412 array_size_show(struct mddev *mddev, char *page)
5414 if (mddev->external_size)
5415 return sprintf(page, "%llu\n",
5416 (unsigned long long)mddev->array_sectors/2);
5418 return sprintf(page, "default\n");
5422 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5427 err = mddev_lock(mddev);
5431 /* cluster raid doesn't support change array_sectors */
5432 if (mddev_is_clustered(mddev)) {
5433 mddev_unlock(mddev);
5437 if (strncmp(buf, "default", 7) == 0) {
5439 sectors = mddev->pers->size(mddev, 0, 0);
5441 sectors = mddev->array_sectors;
5443 mddev->external_size = 0;
5445 if (strict_blocks_to_sectors(buf, §ors) < 0)
5447 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5450 mddev->external_size = 1;
5454 mddev->array_sectors = sectors;
5456 set_capacity_and_notify(mddev->gendisk,
5457 mddev->array_sectors);
5459 mddev_unlock(mddev);
5463 static struct md_sysfs_entry md_array_size =
5464 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5468 consistency_policy_show(struct mddev *mddev, char *page)
5472 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5473 ret = sprintf(page, "journal\n");
5474 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5475 ret = sprintf(page, "ppl\n");
5476 } else if (mddev->bitmap) {
5477 ret = sprintf(page, "bitmap\n");
5478 } else if (mddev->pers) {
5479 if (mddev->pers->sync_request)
5480 ret = sprintf(page, "resync\n");
5482 ret = sprintf(page, "none\n");
5484 ret = sprintf(page, "unknown\n");
5491 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5496 if (mddev->pers->change_consistency_policy)
5497 err = mddev->pers->change_consistency_policy(mddev, buf);
5500 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5501 set_bit(MD_HAS_PPL, &mddev->flags);
5506 return err ? err : len;
5509 static struct md_sysfs_entry md_consistency_policy =
5510 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5511 consistency_policy_store);
5513 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5515 return sprintf(page, "%d\n", mddev->fail_last_dev);
5519 * Setting fail_last_dev to true to allow last device to be forcibly removed
5520 * from RAID1/RAID10.
5523 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5528 ret = kstrtobool(buf, &value);
5532 if (value != mddev->fail_last_dev)
5533 mddev->fail_last_dev = value;
5537 static struct md_sysfs_entry md_fail_last_dev =
5538 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5539 fail_last_dev_store);
5541 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5543 if (mddev->pers == NULL || (mddev->pers->level != 1))
5544 return sprintf(page, "n/a\n");
5546 return sprintf(page, "%d\n", mddev->serialize_policy);
5550 * Setting serialize_policy to true to enforce write IO is not reordered
5554 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5559 err = kstrtobool(buf, &value);
5563 if (value == mddev->serialize_policy)
5566 err = mddev_suspend_and_lock(mddev);
5569 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5570 pr_err("md: serialize_policy is only effective for raid1\n");
5576 mddev_create_serial_pool(mddev, NULL);
5578 mddev_destroy_serial_pool(mddev, NULL);
5579 mddev->serialize_policy = value;
5581 mddev_unlock_and_resume(mddev);
5585 static struct md_sysfs_entry md_serialize_policy =
5586 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5587 serialize_policy_store);
5590 static struct attribute *md_default_attrs[] = {
5593 &md_raid_disks.attr,
5595 &md_chunk_size.attr,
5597 &md_resync_start.attr,
5599 &md_new_device.attr,
5600 &md_safe_delay.attr,
5601 &md_array_state.attr,
5602 &md_reshape_position.attr,
5603 &md_reshape_direction.attr,
5604 &md_array_size.attr,
5605 &max_corr_read_errors.attr,
5606 &md_consistency_policy.attr,
5607 &md_fail_last_dev.attr,
5608 &md_serialize_policy.attr,
5612 static const struct attribute_group md_default_group = {
5613 .attrs = md_default_attrs,
5616 static struct attribute *md_redundancy_attrs[] = {
5618 &md_last_scan_mode.attr,
5619 &md_mismatches.attr,
5622 &md_sync_speed.attr,
5623 &md_sync_force_parallel.attr,
5624 &md_sync_completed.attr,
5627 &md_suspend_lo.attr,
5628 &md_suspend_hi.attr,
5633 static const struct attribute_group md_redundancy_group = {
5635 .attrs = md_redundancy_attrs,
5638 static const struct attribute_group *md_attr_groups[] = {
5645 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5647 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5648 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5653 spin_lock(&all_mddevs_lock);
5654 if (!mddev_get(mddev)) {
5655 spin_unlock(&all_mddevs_lock);
5658 spin_unlock(&all_mddevs_lock);
5660 rv = entry->show(mddev, page);
5666 md_attr_store(struct kobject *kobj, struct attribute *attr,
5667 const char *page, size_t length)
5669 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5670 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5675 if (!capable(CAP_SYS_ADMIN))
5677 spin_lock(&all_mddevs_lock);
5678 if (!mddev_get(mddev)) {
5679 spin_unlock(&all_mddevs_lock);
5682 spin_unlock(&all_mddevs_lock);
5683 rv = entry->store(mddev, page, length);
5688 static void md_kobj_release(struct kobject *ko)
5690 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5692 if (mddev->sysfs_state)
5693 sysfs_put(mddev->sysfs_state);
5694 if (mddev->sysfs_level)
5695 sysfs_put(mddev->sysfs_level);
5697 del_gendisk(mddev->gendisk);
5698 put_disk(mddev->gendisk);
5701 static const struct sysfs_ops md_sysfs_ops = {
5702 .show = md_attr_show,
5703 .store = md_attr_store,
5705 static const struct kobj_type md_ktype = {
5706 .release = md_kobj_release,
5707 .sysfs_ops = &md_sysfs_ops,
5708 .default_groups = md_attr_groups,
5713 static void mddev_delayed_delete(struct work_struct *ws)
5715 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5717 kobject_put(&mddev->kobj);
5720 struct mddev *md_alloc(dev_t dev, char *name)
5723 * If dev is zero, name is the name of a device to allocate with
5724 * an arbitrary minor number. It will be "md_???"
5725 * If dev is non-zero it must be a device number with a MAJOR of
5726 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5727 * the device is being created by opening a node in /dev.
5728 * If "name" is not NULL, the device is being created by
5729 * writing to /sys/module/md_mod/parameters/new_array.
5731 static DEFINE_MUTEX(disks_mutex);
5732 struct mddev *mddev;
5733 struct gendisk *disk;
5740 * Wait for any previous instance of this device to be completely
5741 * removed (mddev_delayed_delete).
5743 flush_workqueue(md_misc_wq);
5745 mutex_lock(&disks_mutex);
5746 mddev = mddev_alloc(dev);
5747 if (IS_ERR(mddev)) {
5748 error = PTR_ERR(mddev);
5752 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5753 shift = partitioned ? MdpMinorShift : 0;
5754 unit = MINOR(mddev->unit) >> shift;
5757 /* Need to ensure that 'name' is not a duplicate.
5759 struct mddev *mddev2;
5760 spin_lock(&all_mddevs_lock);
5762 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5763 if (mddev2->gendisk &&
5764 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5765 spin_unlock(&all_mddevs_lock);
5767 goto out_free_mddev;
5769 spin_unlock(&all_mddevs_lock);
5773 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5775 mddev->hold_active = UNTIL_STOP;
5778 disk = blk_alloc_disk(NUMA_NO_NODE);
5780 goto out_free_mddev;
5782 disk->major = MAJOR(mddev->unit);
5783 disk->first_minor = unit << shift;
5784 disk->minors = 1 << shift;
5786 strcpy(disk->disk_name, name);
5787 else if (partitioned)
5788 sprintf(disk->disk_name, "md_d%d", unit);
5790 sprintf(disk->disk_name, "md%d", unit);
5791 disk->fops = &md_fops;
5792 disk->private_data = mddev;
5794 mddev->queue = disk->queue;
5795 blk_set_stacking_limits(&mddev->queue->limits);
5796 blk_queue_write_cache(mddev->queue, true, true);
5797 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5798 mddev->gendisk = disk;
5799 error = add_disk(disk);
5803 kobject_init(&mddev->kobj, &md_ktype);
5804 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5807 * The disk is already live at this point. Clear the hold flag
5808 * and let mddev_put take care of the deletion, as it isn't any
5809 * different from a normal close on last release now.
5811 mddev->hold_active = 0;
5812 mutex_unlock(&disks_mutex);
5814 return ERR_PTR(error);
5817 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5818 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5819 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5820 mutex_unlock(&disks_mutex);
5828 mutex_unlock(&disks_mutex);
5829 return ERR_PTR(error);
5832 static int md_alloc_and_put(dev_t dev, char *name)
5834 struct mddev *mddev = md_alloc(dev, name);
5837 return PTR_ERR(mddev);
5842 static void md_probe(dev_t dev)
5844 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5847 md_alloc_and_put(dev, NULL);
5850 static int add_named_array(const char *val, const struct kernel_param *kp)
5853 * val must be "md_*" or "mdNNN".
5854 * For "md_*" we allocate an array with a large free minor number, and
5855 * set the name to val. val must not already be an active name.
5856 * For "mdNNN" we allocate an array with the minor number NNN
5857 * which must not already be in use.
5859 int len = strlen(val);
5860 char buf[DISK_NAME_LEN];
5861 unsigned long devnum;
5863 while (len && val[len-1] == '\n')
5865 if (len >= DISK_NAME_LEN)
5867 strscpy(buf, val, len+1);
5868 if (strncmp(buf, "md_", 3) == 0)
5869 return md_alloc_and_put(0, buf);
5870 if (strncmp(buf, "md", 2) == 0 &&
5872 kstrtoul(buf+2, 10, &devnum) == 0 &&
5873 devnum <= MINORMASK)
5874 return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
5879 static void md_safemode_timeout(struct timer_list *t)
5881 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5883 mddev->safemode = 1;
5884 if (mddev->external)
5885 sysfs_notify_dirent_safe(mddev->sysfs_state);
5887 md_wakeup_thread(mddev->thread);
5890 static int start_dirty_degraded;
5892 int md_run(struct mddev *mddev)
5895 struct md_rdev *rdev;
5896 struct md_personality *pers;
5899 if (list_empty(&mddev->disks))
5900 /* cannot run an array with no devices.. */
5905 /* Cannot run until previous stop completes properly */
5906 if (mddev->sysfs_active)
5910 * Analyze all RAID superblock(s)
5912 if (!mddev->raid_disks) {
5913 if (!mddev->persistent)
5915 err = analyze_sbs(mddev);
5920 if (mddev->level != LEVEL_NONE)
5921 request_module("md-level-%d", mddev->level);
5922 else if (mddev->clevel[0])
5923 request_module("md-%s", mddev->clevel);
5926 * Drop all container device buffers, from now on
5927 * the only valid external interface is through the md
5930 mddev->has_superblocks = false;
5931 rdev_for_each(rdev, mddev) {
5932 if (test_bit(Faulty, &rdev->flags))
5934 sync_blockdev(rdev->bdev);
5935 invalidate_bdev(rdev->bdev);
5936 if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
5937 mddev->ro = MD_RDONLY;
5939 set_disk_ro(mddev->gendisk, 1);
5943 mddev->has_superblocks = true;
5945 /* perform some consistency tests on the device.
5946 * We don't want the data to overlap the metadata,
5947 * Internal Bitmap issues have been handled elsewhere.
5949 if (rdev->meta_bdev) {
5950 /* Nothing to check */;
5951 } else if (rdev->data_offset < rdev->sb_start) {
5952 if (mddev->dev_sectors &&
5953 rdev->data_offset + mddev->dev_sectors
5955 pr_warn("md: %s: data overlaps metadata\n",
5960 if (rdev->sb_start + rdev->sb_size/512
5961 > rdev->data_offset) {
5962 pr_warn("md: %s: metadata overlaps data\n",
5967 sysfs_notify_dirent_safe(rdev->sysfs_state);
5968 nowait = nowait && bdev_nowait(rdev->bdev);
5971 if (!bioset_initialized(&mddev->bio_set)) {
5972 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5976 if (!bioset_initialized(&mddev->sync_set)) {
5977 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5982 if (!bioset_initialized(&mddev->io_clone_set)) {
5983 err = bioset_init(&mddev->io_clone_set, BIO_POOL_SIZE,
5984 offsetof(struct md_io_clone, bio_clone), 0);
5989 spin_lock(&pers_lock);
5990 pers = find_pers(mddev->level, mddev->clevel);
5991 if (!pers || !try_module_get(pers->owner)) {
5992 spin_unlock(&pers_lock);
5993 if (mddev->level != LEVEL_NONE)
5994 pr_warn("md: personality for level %d is not loaded!\n",
5997 pr_warn("md: personality for level %s is not loaded!\n",
6002 spin_unlock(&pers_lock);
6003 if (mddev->level != pers->level) {
6004 mddev->level = pers->level;
6005 mddev->new_level = pers->level;
6007 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
6009 if (mddev->reshape_position != MaxSector &&
6010 pers->start_reshape == NULL) {
6011 /* This personality cannot handle reshaping... */
6012 module_put(pers->owner);
6017 if (pers->sync_request) {
6018 /* Warn if this is a potentially silly
6021 struct md_rdev *rdev2;
6024 rdev_for_each(rdev, mddev)
6025 rdev_for_each(rdev2, mddev) {
6027 rdev->bdev->bd_disk ==
6028 rdev2->bdev->bd_disk) {
6029 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
6038 pr_warn("True protection against single-disk failure might be compromised.\n");
6041 mddev->recovery = 0;
6042 /* may be over-ridden by personality */
6043 mddev->resync_max_sectors = mddev->dev_sectors;
6045 mddev->ok_start_degraded = start_dirty_degraded;
6047 if (start_readonly && md_is_rdwr(mddev))
6048 mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
6050 err = pers->run(mddev);
6052 pr_warn("md: pers->run() failed ...\n");
6053 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
6054 WARN_ONCE(!mddev->external_size,
6055 "%s: default size too small, but 'external_size' not in effect?\n",
6057 pr_warn("md: invalid array_size %llu > default size %llu\n",
6058 (unsigned long long)mddev->array_sectors / 2,
6059 (unsigned long long)pers->size(mddev, 0, 0) / 2);
6062 if (err == 0 && pers->sync_request &&
6063 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
6064 struct bitmap *bitmap;
6066 bitmap = md_bitmap_create(mddev, -1);
6067 if (IS_ERR(bitmap)) {
6068 err = PTR_ERR(bitmap);
6069 pr_warn("%s: failed to create bitmap (%d)\n",
6070 mdname(mddev), err);
6072 mddev->bitmap = bitmap;
6078 if (mddev->bitmap_info.max_write_behind > 0) {
6079 bool create_pool = false;
6081 rdev_for_each(rdev, mddev) {
6082 if (test_bit(WriteMostly, &rdev->flags) &&
6083 rdev_init_serial(rdev))
6086 if (create_pool && mddev->serial_info_pool == NULL) {
6087 mddev->serial_info_pool =
6088 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
6089 sizeof(struct serial_info));
6090 if (!mddev->serial_info_pool) {
6100 rdev_for_each(rdev, mddev) {
6101 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
6106 if (mddev->degraded)
6109 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6111 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6112 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6114 /* Set the NOWAIT flags if all underlying devices support it */
6116 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
6118 if (pers->sync_request) {
6119 if (mddev->kobj.sd &&
6120 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6121 pr_warn("md: cannot register extra attributes for %s\n",
6123 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6124 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6125 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6126 } else if (mddev->ro == MD_AUTO_READ)
6127 mddev->ro = MD_RDWR;
6129 atomic_set(&mddev->max_corr_read_errors,
6130 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6131 mddev->safemode = 0;
6132 if (mddev_is_clustered(mddev))
6133 mddev->safemode_delay = 0;
6135 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6138 spin_lock(&mddev->lock);
6140 spin_unlock(&mddev->lock);
6141 rdev_for_each(rdev, mddev)
6142 if (rdev->raid_disk >= 0)
6143 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6145 if (mddev->degraded && md_is_rdwr(mddev))
6146 /* This ensures that recovering status is reported immediately
6147 * via sysfs - until a lack of spares is confirmed.
6149 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6150 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6152 if (mddev->sb_flags)
6153 md_update_sb(mddev, 0);
6159 mddev_detach(mddev);
6161 pers->free(mddev, mddev->private);
6162 mddev->private = NULL;
6163 module_put(pers->owner);
6164 md_bitmap_destroy(mddev);
6166 bioset_exit(&mddev->io_clone_set);
6168 bioset_exit(&mddev->sync_set);
6170 bioset_exit(&mddev->bio_set);
6173 EXPORT_SYMBOL_GPL(md_run);
6175 int do_md_run(struct mddev *mddev)
6179 set_bit(MD_NOT_READY, &mddev->flags);
6180 err = md_run(mddev);
6183 err = md_bitmap_load(mddev);
6185 md_bitmap_destroy(mddev);
6189 if (mddev_is_clustered(mddev))
6190 md_allow_write(mddev);
6192 /* run start up tasks that require md_thread */
6195 md_wakeup_thread(mddev->thread);
6196 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6198 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6199 clear_bit(MD_NOT_READY, &mddev->flags);
6201 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6202 sysfs_notify_dirent_safe(mddev->sysfs_state);
6203 sysfs_notify_dirent_safe(mddev->sysfs_action);
6204 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6206 clear_bit(MD_NOT_READY, &mddev->flags);
6210 int md_start(struct mddev *mddev)
6214 if (mddev->pers->start) {
6215 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6216 md_wakeup_thread(mddev->thread);
6217 ret = mddev->pers->start(mddev);
6218 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6219 md_wakeup_thread(mddev->sync_thread);
6223 EXPORT_SYMBOL_GPL(md_start);
6225 static int restart_array(struct mddev *mddev)
6227 struct gendisk *disk = mddev->gendisk;
6228 struct md_rdev *rdev;
6229 bool has_journal = false;
6230 bool has_readonly = false;
6232 /* Complain if it has no devices */
6233 if (list_empty(&mddev->disks))
6237 if (md_is_rdwr(mddev))
6241 rdev_for_each_rcu(rdev, mddev) {
6242 if (test_bit(Journal, &rdev->flags) &&
6243 !test_bit(Faulty, &rdev->flags))
6245 if (rdev_read_only(rdev))
6246 has_readonly = true;
6249 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6250 /* Don't restart rw with journal missing/faulty */
6255 mddev->safemode = 0;
6256 mddev->ro = MD_RDWR;
6257 set_disk_ro(disk, 0);
6258 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6259 /* Kick recovery or resync if necessary */
6260 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6261 md_wakeup_thread(mddev->thread);
6262 md_wakeup_thread(mddev->sync_thread);
6263 sysfs_notify_dirent_safe(mddev->sysfs_state);
6267 static void md_clean(struct mddev *mddev)
6269 mddev->array_sectors = 0;
6270 mddev->external_size = 0;
6271 mddev->dev_sectors = 0;
6272 mddev->raid_disks = 0;
6273 mddev->recovery_cp = 0;
6274 mddev->resync_min = 0;
6275 mddev->resync_max = MaxSector;
6276 mddev->reshape_position = MaxSector;
6277 /* we still need mddev->external in export_rdev, do not clear it yet */
6278 mddev->persistent = 0;
6279 mddev->level = LEVEL_NONE;
6280 mddev->clevel[0] = 0;
6282 mddev->sb_flags = 0;
6283 mddev->ro = MD_RDWR;
6284 mddev->metadata_type[0] = 0;
6285 mddev->chunk_sectors = 0;
6286 mddev->ctime = mddev->utime = 0;
6288 mddev->max_disks = 0;
6290 mddev->can_decrease_events = 0;
6291 mddev->delta_disks = 0;
6292 mddev->reshape_backwards = 0;
6293 mddev->new_level = LEVEL_NONE;
6294 mddev->new_layout = 0;
6295 mddev->new_chunk_sectors = 0;
6296 mddev->curr_resync = MD_RESYNC_NONE;
6297 atomic64_set(&mddev->resync_mismatches, 0);
6298 mddev->suspend_lo = mddev->suspend_hi = 0;
6299 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6300 mddev->recovery = 0;
6303 mddev->degraded = 0;
6304 mddev->safemode = 0;
6305 mddev->private = NULL;
6306 mddev->cluster_info = NULL;
6307 mddev->bitmap_info.offset = 0;
6308 mddev->bitmap_info.default_offset = 0;
6309 mddev->bitmap_info.default_space = 0;
6310 mddev->bitmap_info.chunksize = 0;
6311 mddev->bitmap_info.daemon_sleep = 0;
6312 mddev->bitmap_info.max_write_behind = 0;
6313 mddev->bitmap_info.nodes = 0;
6316 static void __md_stop_writes(struct mddev *mddev)
6318 stop_sync_thread(mddev, true, false);
6319 del_timer_sync(&mddev->safemode_timer);
6321 if (mddev->pers && mddev->pers->quiesce) {
6322 mddev->pers->quiesce(mddev, 1);
6323 mddev->pers->quiesce(mddev, 0);
6325 md_bitmap_flush(mddev);
6327 if (md_is_rdwr(mddev) &&
6328 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6330 /* mark array as shutdown cleanly */
6331 if (!mddev_is_clustered(mddev))
6333 md_update_sb(mddev, 1);
6335 /* disable policy to guarantee rdevs free resources for serialization */
6336 mddev->serialize_policy = 0;
6337 mddev_destroy_serial_pool(mddev, NULL);
6340 void md_stop_writes(struct mddev *mddev)
6342 mddev_lock_nointr(mddev);
6343 __md_stop_writes(mddev);
6344 mddev_unlock(mddev);
6346 EXPORT_SYMBOL_GPL(md_stop_writes);
6348 static void mddev_detach(struct mddev *mddev)
6350 md_bitmap_wait_behind_writes(mddev);
6351 if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
6352 mddev->pers->quiesce(mddev, 1);
6353 mddev->pers->quiesce(mddev, 0);
6355 md_unregister_thread(mddev, &mddev->thread);
6357 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6360 static void __md_stop(struct mddev *mddev)
6362 struct md_personality *pers = mddev->pers;
6363 md_bitmap_destroy(mddev);
6364 mddev_detach(mddev);
6365 spin_lock(&mddev->lock);
6367 spin_unlock(&mddev->lock);
6369 pers->free(mddev, mddev->private);
6370 mddev->private = NULL;
6371 if (pers->sync_request && mddev->to_remove == NULL)
6372 mddev->to_remove = &md_redundancy_group;
6373 module_put(pers->owner);
6374 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6376 bioset_exit(&mddev->bio_set);
6377 bioset_exit(&mddev->sync_set);
6378 bioset_exit(&mddev->io_clone_set);
6381 void md_stop(struct mddev *mddev)
6383 lockdep_assert_held(&mddev->reconfig_mutex);
6385 /* stop the array and free an attached data structures.
6386 * This is called from dm-raid
6388 __md_stop_writes(mddev);
6392 EXPORT_SYMBOL_GPL(md_stop);
6394 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6399 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6402 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6404 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6405 md_wakeup_thread(mddev->thread);
6408 stop_sync_thread(mddev, false, false);
6409 wait_event(mddev->sb_wait,
6410 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6411 mddev_lock_nointr(mddev);
6413 mutex_lock(&mddev->open_mutex);
6414 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6415 mddev->sync_thread ||
6416 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6417 pr_warn("md: %s still in use.\n",mdname(mddev));
6423 __md_stop_writes(mddev);
6425 if (mddev->ro == MD_RDONLY) {
6430 mddev->ro = MD_RDONLY;
6431 set_disk_ro(mddev->gendisk, 1);
6435 if ((mddev->pers && !err) || did_freeze) {
6436 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6437 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6438 md_wakeup_thread(mddev->thread);
6439 sysfs_notify_dirent_safe(mddev->sysfs_state);
6442 mutex_unlock(&mddev->open_mutex);
6447 * 0 - completely stop and dis-assemble array
6448 * 2 - stop but do not disassemble array
6450 static int do_md_stop(struct mddev *mddev, int mode,
6451 struct block_device *bdev)
6453 struct gendisk *disk = mddev->gendisk;
6454 struct md_rdev *rdev;
6457 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6459 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6460 md_wakeup_thread(mddev->thread);
6463 stop_sync_thread(mddev, true, false);
6465 mutex_lock(&mddev->open_mutex);
6466 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6467 mddev->sysfs_active ||
6468 mddev->sync_thread ||
6469 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6470 pr_warn("md: %s still in use.\n",mdname(mddev));
6471 mutex_unlock(&mddev->open_mutex);
6473 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6474 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6475 md_wakeup_thread(mddev->thread);
6480 if (!md_is_rdwr(mddev))
6481 set_disk_ro(disk, 0);
6483 __md_stop_writes(mddev);
6486 /* tell userspace to handle 'inactive' */
6487 sysfs_notify_dirent_safe(mddev->sysfs_state);
6489 rdev_for_each(rdev, mddev)
6490 if (rdev->raid_disk >= 0)
6491 sysfs_unlink_rdev(mddev, rdev);
6493 set_capacity_and_notify(disk, 0);
6494 mutex_unlock(&mddev->open_mutex);
6497 if (!md_is_rdwr(mddev))
6498 mddev->ro = MD_RDWR;
6500 mutex_unlock(&mddev->open_mutex);
6502 * Free resources if final stop
6505 pr_info("md: %s stopped.\n", mdname(mddev));
6507 if (mddev->bitmap_info.file) {
6508 struct file *f = mddev->bitmap_info.file;
6509 spin_lock(&mddev->lock);
6510 mddev->bitmap_info.file = NULL;
6511 spin_unlock(&mddev->lock);
6514 mddev->bitmap_info.offset = 0;
6516 export_array(mddev);
6519 if (mddev->hold_active == UNTIL_STOP)
6520 mddev->hold_active = 0;
6523 sysfs_notify_dirent_safe(mddev->sysfs_state);
6528 static void autorun_array(struct mddev *mddev)
6530 struct md_rdev *rdev;
6533 if (list_empty(&mddev->disks))
6536 pr_info("md: running: ");
6538 rdev_for_each(rdev, mddev) {
6539 pr_cont("<%pg>", rdev->bdev);
6543 err = do_md_run(mddev);
6545 pr_warn("md: do_md_run() returned %d\n", err);
6546 do_md_stop(mddev, 0, NULL);
6551 * lets try to run arrays based on all disks that have arrived
6552 * until now. (those are in pending_raid_disks)
6554 * the method: pick the first pending disk, collect all disks with
6555 * the same UUID, remove all from the pending list and put them into
6556 * the 'same_array' list. Then order this list based on superblock
6557 * update time (freshest comes first), kick out 'old' disks and
6558 * compare superblocks. If everything's fine then run it.
6560 * If "unit" is allocated, then bump its reference count
6562 static void autorun_devices(int part)
6564 struct md_rdev *rdev0, *rdev, *tmp;
6565 struct mddev *mddev;
6567 pr_info("md: autorun ...\n");
6568 while (!list_empty(&pending_raid_disks)) {
6571 LIST_HEAD(candidates);
6572 rdev0 = list_entry(pending_raid_disks.next,
6573 struct md_rdev, same_set);
6575 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6576 INIT_LIST_HEAD(&candidates);
6577 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6578 if (super_90_load(rdev, rdev0, 0) >= 0) {
6579 pr_debug("md: adding %pg ...\n",
6581 list_move(&rdev->same_set, &candidates);
6584 * now we have a set of devices, with all of them having
6585 * mostly sane superblocks. It's time to allocate the
6589 dev = MKDEV(mdp_major,
6590 rdev0->preferred_minor << MdpMinorShift);
6591 unit = MINOR(dev) >> MdpMinorShift;
6593 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6596 if (rdev0->preferred_minor != unit) {
6597 pr_warn("md: unit number in %pg is bad: %d\n",
6598 rdev0->bdev, rdev0->preferred_minor);
6602 mddev = md_alloc(dev, NULL);
6606 if (mddev_suspend_and_lock(mddev))
6607 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6608 else if (mddev->raid_disks || mddev->major_version
6609 || !list_empty(&mddev->disks)) {
6610 pr_warn("md: %s already running, cannot run %pg\n",
6611 mdname(mddev), rdev0->bdev);
6612 mddev_unlock_and_resume(mddev);
6614 pr_debug("md: created %s\n", mdname(mddev));
6615 mddev->persistent = 1;
6616 rdev_for_each_list(rdev, tmp, &candidates) {
6617 list_del_init(&rdev->same_set);
6618 if (bind_rdev_to_array(rdev, mddev))
6619 export_rdev(rdev, mddev);
6621 autorun_array(mddev);
6622 mddev_unlock_and_resume(mddev);
6624 /* on success, candidates will be empty, on error
6627 rdev_for_each_list(rdev, tmp, &candidates) {
6628 list_del_init(&rdev->same_set);
6629 export_rdev(rdev, mddev);
6633 pr_info("md: ... autorun DONE.\n");
6635 #endif /* !MODULE */
6637 static int get_version(void __user *arg)
6641 ver.major = MD_MAJOR_VERSION;
6642 ver.minor = MD_MINOR_VERSION;
6643 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6645 if (copy_to_user(arg, &ver, sizeof(ver)))
6651 static int get_array_info(struct mddev *mddev, void __user *arg)
6653 mdu_array_info_t info;
6654 int nr,working,insync,failed,spare;
6655 struct md_rdev *rdev;
6657 nr = working = insync = failed = spare = 0;
6659 rdev_for_each_rcu(rdev, mddev) {
6661 if (test_bit(Faulty, &rdev->flags))
6665 if (test_bit(In_sync, &rdev->flags))
6667 else if (test_bit(Journal, &rdev->flags))
6668 /* TODO: add journal count to md_u.h */
6676 info.major_version = mddev->major_version;
6677 info.minor_version = mddev->minor_version;
6678 info.patch_version = MD_PATCHLEVEL_VERSION;
6679 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6680 info.level = mddev->level;
6681 info.size = mddev->dev_sectors / 2;
6682 if (info.size != mddev->dev_sectors / 2) /* overflow */
6685 info.raid_disks = mddev->raid_disks;
6686 info.md_minor = mddev->md_minor;
6687 info.not_persistent= !mddev->persistent;
6689 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6692 info.state = (1<<MD_SB_CLEAN);
6693 if (mddev->bitmap && mddev->bitmap_info.offset)
6694 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6695 if (mddev_is_clustered(mddev))
6696 info.state |= (1<<MD_SB_CLUSTERED);
6697 info.active_disks = insync;
6698 info.working_disks = working;
6699 info.failed_disks = failed;
6700 info.spare_disks = spare;
6702 info.layout = mddev->layout;
6703 info.chunk_size = mddev->chunk_sectors << 9;
6705 if (copy_to_user(arg, &info, sizeof(info)))
6711 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6713 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6717 file = kzalloc(sizeof(*file), GFP_NOIO);
6722 spin_lock(&mddev->lock);
6723 /* bitmap enabled */
6724 if (mddev->bitmap_info.file) {
6725 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6726 sizeof(file->pathname));
6730 memmove(file->pathname, ptr,
6731 sizeof(file->pathname)-(ptr-file->pathname));
6733 spin_unlock(&mddev->lock);
6736 copy_to_user(arg, file, sizeof(*file)))
6743 static int get_disk_info(struct mddev *mddev, void __user * arg)
6745 mdu_disk_info_t info;
6746 struct md_rdev *rdev;
6748 if (copy_from_user(&info, arg, sizeof(info)))
6752 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6754 info.major = MAJOR(rdev->bdev->bd_dev);
6755 info.minor = MINOR(rdev->bdev->bd_dev);
6756 info.raid_disk = rdev->raid_disk;
6758 if (test_bit(Faulty, &rdev->flags))
6759 info.state |= (1<<MD_DISK_FAULTY);
6760 else if (test_bit(In_sync, &rdev->flags)) {
6761 info.state |= (1<<MD_DISK_ACTIVE);
6762 info.state |= (1<<MD_DISK_SYNC);
6764 if (test_bit(Journal, &rdev->flags))
6765 info.state |= (1<<MD_DISK_JOURNAL);
6766 if (test_bit(WriteMostly, &rdev->flags))
6767 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6768 if (test_bit(FailFast, &rdev->flags))
6769 info.state |= (1<<MD_DISK_FAILFAST);
6771 info.major = info.minor = 0;
6772 info.raid_disk = -1;
6773 info.state = (1<<MD_DISK_REMOVED);
6777 if (copy_to_user(arg, &info, sizeof(info)))
6783 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6785 struct md_rdev *rdev;
6786 dev_t dev = MKDEV(info->major,info->minor);
6788 if (mddev_is_clustered(mddev) &&
6789 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6790 pr_warn("%s: Cannot add to clustered mddev.\n",
6795 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6798 if (!mddev->raid_disks) {
6800 /* expecting a device which has a superblock */
6801 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6803 pr_warn("md: md_import_device returned %ld\n",
6805 return PTR_ERR(rdev);
6807 if (!list_empty(&mddev->disks)) {
6808 struct md_rdev *rdev0
6809 = list_entry(mddev->disks.next,
6810 struct md_rdev, same_set);
6811 err = super_types[mddev->major_version]
6812 .load_super(rdev, rdev0, mddev->minor_version);
6814 pr_warn("md: %pg has different UUID to %pg\n",
6817 export_rdev(rdev, mddev);
6821 err = bind_rdev_to_array(rdev, mddev);
6823 export_rdev(rdev, mddev);
6828 * md_add_new_disk can be used once the array is assembled
6829 * to add "hot spares". They must already have a superblock
6834 if (!mddev->pers->hot_add_disk) {
6835 pr_warn("%s: personality does not support diskops!\n",
6839 if (mddev->persistent)
6840 rdev = md_import_device(dev, mddev->major_version,
6841 mddev->minor_version);
6843 rdev = md_import_device(dev, -1, -1);
6845 pr_warn("md: md_import_device returned %ld\n",
6847 return PTR_ERR(rdev);
6849 /* set saved_raid_disk if appropriate */
6850 if (!mddev->persistent) {
6851 if (info->state & (1<<MD_DISK_SYNC) &&
6852 info->raid_disk < mddev->raid_disks) {
6853 rdev->raid_disk = info->raid_disk;
6854 clear_bit(Bitmap_sync, &rdev->flags);
6856 rdev->raid_disk = -1;
6857 rdev->saved_raid_disk = rdev->raid_disk;
6859 super_types[mddev->major_version].
6860 validate_super(mddev, NULL/*freshest*/, rdev);
6861 if ((info->state & (1<<MD_DISK_SYNC)) &&
6862 rdev->raid_disk != info->raid_disk) {
6863 /* This was a hot-add request, but events doesn't
6864 * match, so reject it.
6866 export_rdev(rdev, mddev);
6870 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6871 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6872 set_bit(WriteMostly, &rdev->flags);
6874 clear_bit(WriteMostly, &rdev->flags);
6875 if (info->state & (1<<MD_DISK_FAILFAST))
6876 set_bit(FailFast, &rdev->flags);
6878 clear_bit(FailFast, &rdev->flags);
6880 if (info->state & (1<<MD_DISK_JOURNAL)) {
6881 struct md_rdev *rdev2;
6882 bool has_journal = false;
6884 /* make sure no existing journal disk */
6885 rdev_for_each(rdev2, mddev) {
6886 if (test_bit(Journal, &rdev2->flags)) {
6891 if (has_journal || mddev->bitmap) {
6892 export_rdev(rdev, mddev);
6895 set_bit(Journal, &rdev->flags);
6898 * check whether the device shows up in other nodes
6900 if (mddev_is_clustered(mddev)) {
6901 if (info->state & (1 << MD_DISK_CANDIDATE))
6902 set_bit(Candidate, &rdev->flags);
6903 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6904 /* --add initiated by this node */
6905 err = md_cluster_ops->add_new_disk(mddev, rdev);
6907 export_rdev(rdev, mddev);
6913 rdev->raid_disk = -1;
6914 err = bind_rdev_to_array(rdev, mddev);
6917 export_rdev(rdev, mddev);
6919 if (mddev_is_clustered(mddev)) {
6920 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6922 err = md_cluster_ops->new_disk_ack(mddev,
6925 md_kick_rdev_from_array(rdev);
6929 md_cluster_ops->add_new_disk_cancel(mddev);
6931 err = add_bound_rdev(rdev);
6935 err = add_bound_rdev(rdev);
6940 /* otherwise, md_add_new_disk is only allowed
6941 * for major_version==0 superblocks
6943 if (mddev->major_version != 0) {
6944 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6948 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6950 rdev = md_import_device(dev, -1, 0);
6952 pr_warn("md: error, md_import_device() returned %ld\n",
6954 return PTR_ERR(rdev);
6956 rdev->desc_nr = info->number;
6957 if (info->raid_disk < mddev->raid_disks)
6958 rdev->raid_disk = info->raid_disk;
6960 rdev->raid_disk = -1;
6962 if (rdev->raid_disk < mddev->raid_disks)
6963 if (info->state & (1<<MD_DISK_SYNC))
6964 set_bit(In_sync, &rdev->flags);
6966 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6967 set_bit(WriteMostly, &rdev->flags);
6968 if (info->state & (1<<MD_DISK_FAILFAST))
6969 set_bit(FailFast, &rdev->flags);
6971 if (!mddev->persistent) {
6972 pr_debug("md: nonpersistent superblock ...\n");
6973 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6975 rdev->sb_start = calc_dev_sboffset(rdev);
6976 rdev->sectors = rdev->sb_start;
6978 err = bind_rdev_to_array(rdev, mddev);
6980 export_rdev(rdev, mddev);
6988 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6990 struct md_rdev *rdev;
6995 rdev = find_rdev(mddev, dev);
6999 if (rdev->raid_disk < 0)
7002 clear_bit(Blocked, &rdev->flags);
7003 remove_and_add_spares(mddev, rdev);
7005 if (rdev->raid_disk >= 0)
7009 if (mddev_is_clustered(mddev)) {
7010 if (md_cluster_ops->remove_disk(mddev, rdev))
7014 md_kick_rdev_from_array(rdev);
7015 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7017 md_wakeup_thread(mddev->thread);
7019 md_update_sb(mddev, 1);
7024 pr_debug("md: cannot remove active disk %pg from %s ...\n",
7025 rdev->bdev, mdname(mddev));
7029 static int hot_add_disk(struct mddev *mddev, dev_t dev)
7032 struct md_rdev *rdev;
7037 if (mddev->major_version != 0) {
7038 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
7042 if (!mddev->pers->hot_add_disk) {
7043 pr_warn("%s: personality does not support diskops!\n",
7048 rdev = md_import_device(dev, -1, 0);
7050 pr_warn("md: error, md_import_device() returned %ld\n",
7055 if (mddev->persistent)
7056 rdev->sb_start = calc_dev_sboffset(rdev);
7058 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
7060 rdev->sectors = rdev->sb_start;
7062 if (test_bit(Faulty, &rdev->flags)) {
7063 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
7064 rdev->bdev, mdname(mddev));
7069 clear_bit(In_sync, &rdev->flags);
7071 rdev->saved_raid_disk = -1;
7072 err = bind_rdev_to_array(rdev, mddev);
7077 * The rest should better be atomic, we can have disk failures
7078 * noticed in interrupt contexts ...
7081 rdev->raid_disk = -1;
7083 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7085 md_update_sb(mddev, 1);
7087 * If the new disk does not support REQ_NOWAIT,
7088 * disable on the whole MD.
7090 if (!bdev_nowait(rdev->bdev)) {
7091 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
7092 mdname(mddev), rdev->bdev);
7093 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
7096 * Kick recovery, maybe this spare has to be added to the
7097 * array immediately.
7099 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7100 md_wakeup_thread(mddev->thread);
7105 export_rdev(rdev, mddev);
7109 static int set_bitmap_file(struct mddev *mddev, int fd)
7114 if (!mddev->pers->quiesce || !mddev->thread)
7116 if (mddev->recovery || mddev->sync_thread)
7118 /* we should be able to change the bitmap.. */
7122 struct inode *inode;
7125 if (mddev->bitmap || mddev->bitmap_info.file)
7126 return -EEXIST; /* cannot add when bitmap is present */
7128 if (!IS_ENABLED(CONFIG_MD_BITMAP_FILE)) {
7129 pr_warn("%s: bitmap files not supported by this kernel\n",
7133 pr_warn("%s: using deprecated bitmap file support\n",
7139 pr_warn("%s: error: failed to get bitmap file\n",
7144 inode = f->f_mapping->host;
7145 if (!S_ISREG(inode->i_mode)) {
7146 pr_warn("%s: error: bitmap file must be a regular file\n",
7149 } else if (!(f->f_mode & FMODE_WRITE)) {
7150 pr_warn("%s: error: bitmap file must open for write\n",
7153 } else if (atomic_read(&inode->i_writecount) != 1) {
7154 pr_warn("%s: error: bitmap file is already in use\n",
7162 mddev->bitmap_info.file = f;
7163 mddev->bitmap_info.offset = 0; /* file overrides offset */
7164 } else if (mddev->bitmap == NULL)
7165 return -ENOENT; /* cannot remove what isn't there */
7169 struct bitmap *bitmap;
7171 bitmap = md_bitmap_create(mddev, -1);
7172 if (!IS_ERR(bitmap)) {
7173 mddev->bitmap = bitmap;
7174 err = md_bitmap_load(mddev);
7176 err = PTR_ERR(bitmap);
7178 md_bitmap_destroy(mddev);
7181 } else if (fd < 0) {
7182 md_bitmap_destroy(mddev);
7186 struct file *f = mddev->bitmap_info.file;
7188 spin_lock(&mddev->lock);
7189 mddev->bitmap_info.file = NULL;
7190 spin_unlock(&mddev->lock);
7199 * md_set_array_info is used two different ways
7200 * The original usage is when creating a new array.
7201 * In this usage, raid_disks is > 0 and it together with
7202 * level, size, not_persistent,layout,chunksize determine the
7203 * shape of the array.
7204 * This will always create an array with a type-0.90.0 superblock.
7205 * The newer usage is when assembling an array.
7206 * In this case raid_disks will be 0, and the major_version field is
7207 * use to determine which style super-blocks are to be found on the devices.
7208 * The minor and patch _version numbers are also kept incase the
7209 * super_block handler wishes to interpret them.
7211 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7213 if (info->raid_disks == 0) {
7214 /* just setting version number for superblock loading */
7215 if (info->major_version < 0 ||
7216 info->major_version >= ARRAY_SIZE(super_types) ||
7217 super_types[info->major_version].name == NULL) {
7218 /* maybe try to auto-load a module? */
7219 pr_warn("md: superblock version %d not known\n",
7220 info->major_version);
7223 mddev->major_version = info->major_version;
7224 mddev->minor_version = info->minor_version;
7225 mddev->patch_version = info->patch_version;
7226 mddev->persistent = !info->not_persistent;
7227 /* ensure mddev_put doesn't delete this now that there
7228 * is some minimal configuration.
7230 mddev->ctime = ktime_get_real_seconds();
7233 mddev->major_version = MD_MAJOR_VERSION;
7234 mddev->minor_version = MD_MINOR_VERSION;
7235 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7236 mddev->ctime = ktime_get_real_seconds();
7238 mddev->level = info->level;
7239 mddev->clevel[0] = 0;
7240 mddev->dev_sectors = 2 * (sector_t)info->size;
7241 mddev->raid_disks = info->raid_disks;
7242 /* don't set md_minor, it is determined by which /dev/md* was
7245 if (info->state & (1<<MD_SB_CLEAN))
7246 mddev->recovery_cp = MaxSector;
7248 mddev->recovery_cp = 0;
7249 mddev->persistent = ! info->not_persistent;
7250 mddev->external = 0;
7252 mddev->layout = info->layout;
7253 if (mddev->level == 0)
7254 /* Cannot trust RAID0 layout info here */
7256 mddev->chunk_sectors = info->chunk_size >> 9;
7258 if (mddev->persistent) {
7259 mddev->max_disks = MD_SB_DISKS;
7261 mddev->sb_flags = 0;
7263 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7265 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7266 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7267 mddev->bitmap_info.offset = 0;
7269 mddev->reshape_position = MaxSector;
7272 * Generate a 128 bit UUID
7274 get_random_bytes(mddev->uuid, 16);
7276 mddev->new_level = mddev->level;
7277 mddev->new_chunk_sectors = mddev->chunk_sectors;
7278 mddev->new_layout = mddev->layout;
7279 mddev->delta_disks = 0;
7280 mddev->reshape_backwards = 0;
7285 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7287 lockdep_assert_held(&mddev->reconfig_mutex);
7289 if (mddev->external_size)
7292 mddev->array_sectors = array_sectors;
7294 EXPORT_SYMBOL(md_set_array_sectors);
7296 static int update_size(struct mddev *mddev, sector_t num_sectors)
7298 struct md_rdev *rdev;
7300 int fit = (num_sectors == 0);
7301 sector_t old_dev_sectors = mddev->dev_sectors;
7303 if (mddev->pers->resize == NULL)
7305 /* The "num_sectors" is the number of sectors of each device that
7306 * is used. This can only make sense for arrays with redundancy.
7307 * linear and raid0 always use whatever space is available. We can only
7308 * consider changing this number if no resync or reconstruction is
7309 * happening, and if the new size is acceptable. It must fit before the
7310 * sb_start or, if that is <data_offset, it must fit before the size
7311 * of each device. If num_sectors is zero, we find the largest size
7314 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7317 if (!md_is_rdwr(mddev))
7320 rdev_for_each(rdev, mddev) {
7321 sector_t avail = rdev->sectors;
7323 if (fit && (num_sectors == 0 || num_sectors > avail))
7324 num_sectors = avail;
7325 if (avail < num_sectors)
7328 rv = mddev->pers->resize(mddev, num_sectors);
7330 if (mddev_is_clustered(mddev))
7331 md_cluster_ops->update_size(mddev, old_dev_sectors);
7332 else if (mddev->queue) {
7333 set_capacity_and_notify(mddev->gendisk,
7334 mddev->array_sectors);
7340 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7343 struct md_rdev *rdev;
7344 /* change the number of raid disks */
7345 if (mddev->pers->check_reshape == NULL)
7347 if (!md_is_rdwr(mddev))
7349 if (raid_disks <= 0 ||
7350 (mddev->max_disks && raid_disks >= mddev->max_disks))
7352 if (mddev->sync_thread ||
7353 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7354 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7355 mddev->reshape_position != MaxSector)
7358 rdev_for_each(rdev, mddev) {
7359 if (mddev->raid_disks < raid_disks &&
7360 rdev->data_offset < rdev->new_data_offset)
7362 if (mddev->raid_disks > raid_disks &&
7363 rdev->data_offset > rdev->new_data_offset)
7367 mddev->delta_disks = raid_disks - mddev->raid_disks;
7368 if (mddev->delta_disks < 0)
7369 mddev->reshape_backwards = 1;
7370 else if (mddev->delta_disks > 0)
7371 mddev->reshape_backwards = 0;
7373 rv = mddev->pers->check_reshape(mddev);
7375 mddev->delta_disks = 0;
7376 mddev->reshape_backwards = 0;
7382 * update_array_info is used to change the configuration of an
7384 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7385 * fields in the info are checked against the array.
7386 * Any differences that cannot be handled will cause an error.
7387 * Normally, only one change can be managed at a time.
7389 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7395 /* calculate expected state,ignoring low bits */
7396 if (mddev->bitmap && mddev->bitmap_info.offset)
7397 state |= (1 << MD_SB_BITMAP_PRESENT);
7399 if (mddev->major_version != info->major_version ||
7400 mddev->minor_version != info->minor_version ||
7401 /* mddev->patch_version != info->patch_version || */
7402 mddev->ctime != info->ctime ||
7403 mddev->level != info->level ||
7404 /* mddev->layout != info->layout || */
7405 mddev->persistent != !info->not_persistent ||
7406 mddev->chunk_sectors != info->chunk_size >> 9 ||
7407 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7408 ((state^info->state) & 0xfffffe00)
7411 /* Check there is only one change */
7412 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7414 if (mddev->raid_disks != info->raid_disks)
7416 if (mddev->layout != info->layout)
7418 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7425 if (mddev->layout != info->layout) {
7427 * we don't need to do anything at the md level, the
7428 * personality will take care of it all.
7430 if (mddev->pers->check_reshape == NULL)
7433 mddev->new_layout = info->layout;
7434 rv = mddev->pers->check_reshape(mddev);
7436 mddev->new_layout = mddev->layout;
7440 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7441 rv = update_size(mddev, (sector_t)info->size * 2);
7443 if (mddev->raid_disks != info->raid_disks)
7444 rv = update_raid_disks(mddev, info->raid_disks);
7446 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7447 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7451 if (mddev->recovery || mddev->sync_thread) {
7455 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7456 struct bitmap *bitmap;
7457 /* add the bitmap */
7458 if (mddev->bitmap) {
7462 if (mddev->bitmap_info.default_offset == 0) {
7466 mddev->bitmap_info.offset =
7467 mddev->bitmap_info.default_offset;
7468 mddev->bitmap_info.space =
7469 mddev->bitmap_info.default_space;
7470 bitmap = md_bitmap_create(mddev, -1);
7471 if (!IS_ERR(bitmap)) {
7472 mddev->bitmap = bitmap;
7473 rv = md_bitmap_load(mddev);
7475 rv = PTR_ERR(bitmap);
7477 md_bitmap_destroy(mddev);
7479 /* remove the bitmap */
7480 if (!mddev->bitmap) {
7484 if (mddev->bitmap->storage.file) {
7488 if (mddev->bitmap_info.nodes) {
7489 /* hold PW on all the bitmap lock */
7490 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7491 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7493 md_cluster_ops->unlock_all_bitmaps(mddev);
7497 mddev->bitmap_info.nodes = 0;
7498 md_cluster_ops->leave(mddev);
7499 module_put(md_cluster_mod);
7500 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7502 md_bitmap_destroy(mddev);
7503 mddev->bitmap_info.offset = 0;
7506 md_update_sb(mddev, 1);
7512 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7514 struct md_rdev *rdev;
7517 if (mddev->pers == NULL)
7521 rdev = md_find_rdev_rcu(mddev, dev);
7525 md_error(mddev, rdev);
7526 if (test_bit(MD_BROKEN, &mddev->flags))
7534 * We have a problem here : there is no easy way to give a CHS
7535 * virtual geometry. We currently pretend that we have a 2 heads
7536 * 4 sectors (with a BIG number of cylinders...). This drives
7537 * dosfs just mad... ;-)
7539 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7541 struct mddev *mddev = bdev->bd_disk->private_data;
7545 geo->cylinders = mddev->array_sectors / 8;
7549 static inline bool md_ioctl_valid(unsigned int cmd)
7553 case GET_ARRAY_INFO:
7554 case GET_BITMAP_FILE:
7557 case HOT_REMOVE_DISK:
7559 case RESTART_ARRAY_RW:
7561 case SET_ARRAY_INFO:
7562 case SET_BITMAP_FILE:
7563 case SET_DISK_FAULTY:
7566 case CLUSTERED_DISK_NACK:
7573 static bool md_ioctl_need_suspend(unsigned int cmd)
7578 case HOT_REMOVE_DISK:
7579 case SET_BITMAP_FILE:
7580 case SET_ARRAY_INFO:
7587 static int __md_set_array_info(struct mddev *mddev, void __user *argp)
7589 mdu_array_info_t info;
7593 memset(&info, 0, sizeof(info));
7594 else if (copy_from_user(&info, argp, sizeof(info)))
7598 err = update_array_info(mddev, &info);
7600 pr_warn("md: couldn't update array info. %d\n", err);
7604 if (!list_empty(&mddev->disks)) {
7605 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7609 if (mddev->raid_disks) {
7610 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7614 err = md_set_array_info(mddev, &info);
7616 pr_warn("md: couldn't set array info. %d\n", err);
7621 static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
7622 unsigned int cmd, unsigned long arg)
7625 void __user *argp = (void __user *)arg;
7626 struct mddev *mddev = NULL;
7627 bool did_set_md_closing = false;
7629 if (!md_ioctl_valid(cmd))
7634 case GET_ARRAY_INFO:
7638 if (!capable(CAP_SYS_ADMIN))
7643 * Commands dealing with the RAID driver but not any
7648 err = get_version(argp);
7654 * Commands creating/starting a new array:
7657 mddev = bdev->bd_disk->private_data;
7664 /* Some actions do not requires the mutex */
7666 case GET_ARRAY_INFO:
7667 if (!mddev->raid_disks && !mddev->external)
7670 err = get_array_info(mddev, argp);
7674 if (!mddev->raid_disks && !mddev->external)
7677 err = get_disk_info(mddev, argp);
7680 case SET_DISK_FAULTY:
7681 err = set_disk_faulty(mddev, new_decode_dev(arg));
7684 case GET_BITMAP_FILE:
7685 err = get_bitmap_file(mddev, argp);
7690 if (cmd == HOT_REMOVE_DISK)
7691 /* need to ensure recovery thread has run */
7692 wait_event_interruptible_timeout(mddev->sb_wait,
7693 !test_bit(MD_RECOVERY_NEEDED,
7695 msecs_to_jiffies(5000));
7696 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7697 /* Need to flush page cache, and ensure no-one else opens
7700 mutex_lock(&mddev->open_mutex);
7701 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7702 mutex_unlock(&mddev->open_mutex);
7706 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7707 mutex_unlock(&mddev->open_mutex);
7711 did_set_md_closing = true;
7712 mutex_unlock(&mddev->open_mutex);
7713 sync_blockdev(bdev);
7716 if (!md_is_rdwr(mddev))
7717 flush_work(&mddev->sync_work);
7719 err = md_ioctl_need_suspend(cmd) ? mddev_suspend_and_lock(mddev) :
7722 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7727 if (cmd == SET_ARRAY_INFO) {
7728 err = __md_set_array_info(mddev, argp);
7733 * Commands querying/configuring an existing array:
7735 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7736 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7737 if ((!mddev->raid_disks && !mddev->external)
7738 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7739 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7740 && cmd != GET_BITMAP_FILE) {
7746 * Commands even a read-only array can execute:
7749 case RESTART_ARRAY_RW:
7750 err = restart_array(mddev);
7754 err = do_md_stop(mddev, 0, bdev);
7758 err = md_set_readonly(mddev, bdev);
7761 case HOT_REMOVE_DISK:
7762 err = hot_remove_disk(mddev, new_decode_dev(arg));
7766 /* We can support ADD_NEW_DISK on read-only arrays
7767 * only if we are re-adding a preexisting device.
7768 * So require mddev->pers and MD_DISK_SYNC.
7771 mdu_disk_info_t info;
7772 if (copy_from_user(&info, argp, sizeof(info)))
7774 else if (!(info.state & (1<<MD_DISK_SYNC)))
7775 /* Need to clear read-only for this */
7778 err = md_add_new_disk(mddev, &info);
7785 * The remaining ioctls are changing the state of the
7786 * superblock, so we do not allow them on read-only arrays.
7788 if (!md_is_rdwr(mddev) && mddev->pers) {
7789 if (mddev->ro != MD_AUTO_READ) {
7793 mddev->ro = MD_RDWR;
7794 sysfs_notify_dirent_safe(mddev->sysfs_state);
7795 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7796 /* mddev_unlock will wake thread */
7797 /* If a device failed while we were read-only, we
7798 * need to make sure the metadata is updated now.
7800 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7801 mddev_unlock(mddev);
7802 wait_event(mddev->sb_wait,
7803 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7804 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7805 mddev_lock_nointr(mddev);
7812 mdu_disk_info_t info;
7813 if (copy_from_user(&info, argp, sizeof(info)))
7816 err = md_add_new_disk(mddev, &info);
7820 case CLUSTERED_DISK_NACK:
7821 if (mddev_is_clustered(mddev))
7822 md_cluster_ops->new_disk_ack(mddev, false);
7828 err = hot_add_disk(mddev, new_decode_dev(arg));
7832 err = do_md_run(mddev);
7835 case SET_BITMAP_FILE:
7836 err = set_bitmap_file(mddev, (int)arg);
7845 if (mddev->hold_active == UNTIL_IOCTL &&
7847 mddev->hold_active = 0;
7849 md_ioctl_need_suspend(cmd) ? mddev_unlock_and_resume(mddev) :
7850 mddev_unlock(mddev);
7853 if(did_set_md_closing)
7854 clear_bit(MD_CLOSING, &mddev->flags);
7857 #ifdef CONFIG_COMPAT
7858 static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
7859 unsigned int cmd, unsigned long arg)
7862 case HOT_REMOVE_DISK:
7864 case SET_DISK_FAULTY:
7865 case SET_BITMAP_FILE:
7866 /* These take in integer arg, do not convert */
7869 arg = (unsigned long)compat_ptr(arg);
7873 return md_ioctl(bdev, mode, cmd, arg);
7875 #endif /* CONFIG_COMPAT */
7877 static int md_set_read_only(struct block_device *bdev, bool ro)
7879 struct mddev *mddev = bdev->bd_disk->private_data;
7882 err = mddev_lock(mddev);
7886 if (!mddev->raid_disks && !mddev->external) {
7892 * Transitioning to read-auto need only happen for arrays that call
7893 * md_write_start and which are not ready for writes yet.
7895 if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
7896 err = restart_array(mddev);
7899 mddev->ro = MD_AUTO_READ;
7903 mddev_unlock(mddev);
7907 static int md_open(struct gendisk *disk, blk_mode_t mode)
7909 struct mddev *mddev;
7912 spin_lock(&all_mddevs_lock);
7913 mddev = mddev_get(disk->private_data);
7914 spin_unlock(&all_mddevs_lock);
7918 err = mutex_lock_interruptible(&mddev->open_mutex);
7923 if (test_bit(MD_CLOSING, &mddev->flags))
7926 atomic_inc(&mddev->openers);
7927 mutex_unlock(&mddev->open_mutex);
7929 disk_check_media_change(disk);
7933 mutex_unlock(&mddev->open_mutex);
7939 static void md_release(struct gendisk *disk)
7941 struct mddev *mddev = disk->private_data;
7944 atomic_dec(&mddev->openers);
7948 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7950 struct mddev *mddev = disk->private_data;
7951 unsigned int ret = 0;
7954 ret = DISK_EVENT_MEDIA_CHANGE;
7959 static void md_free_disk(struct gendisk *disk)
7961 struct mddev *mddev = disk->private_data;
7966 const struct block_device_operations md_fops =
7968 .owner = THIS_MODULE,
7969 .submit_bio = md_submit_bio,
7971 .release = md_release,
7973 #ifdef CONFIG_COMPAT
7974 .compat_ioctl = md_compat_ioctl,
7976 .getgeo = md_getgeo,
7977 .check_events = md_check_events,
7978 .set_read_only = md_set_read_only,
7979 .free_disk = md_free_disk,
7982 static int md_thread(void *arg)
7984 struct md_thread *thread = arg;
7987 * md_thread is a 'system-thread', it's priority should be very
7988 * high. We avoid resource deadlocks individually in each
7989 * raid personality. (RAID5 does preallocation) We also use RR and
7990 * the very same RT priority as kswapd, thus we will never get
7991 * into a priority inversion deadlock.
7993 * we definitely have to have equal or higher priority than
7994 * bdflush, otherwise bdflush will deadlock if there are too
7995 * many dirty RAID5 blocks.
7998 allow_signal(SIGKILL);
7999 while (!kthread_should_stop()) {
8001 /* We need to wait INTERRUPTIBLE so that
8002 * we don't add to the load-average.
8003 * That means we need to be sure no signals are
8006 if (signal_pending(current))
8007 flush_signals(current);
8009 wait_event_interruptible_timeout
8011 test_bit(THREAD_WAKEUP, &thread->flags)
8012 || kthread_should_stop() || kthread_should_park(),
8015 clear_bit(THREAD_WAKEUP, &thread->flags);
8016 if (kthread_should_park())
8018 if (!kthread_should_stop())
8019 thread->run(thread);
8025 static void md_wakeup_thread_directly(struct md_thread __rcu *thread)
8027 struct md_thread *t;
8030 t = rcu_dereference(thread);
8032 wake_up_process(t->tsk);
8036 void md_wakeup_thread(struct md_thread __rcu *thread)
8038 struct md_thread *t;
8041 t = rcu_dereference(thread);
8043 pr_debug("md: waking up MD thread %s.\n", t->tsk->comm);
8044 set_bit(THREAD_WAKEUP, &t->flags);
8045 wake_up(&t->wqueue);
8049 EXPORT_SYMBOL(md_wakeup_thread);
8051 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
8052 struct mddev *mddev, const char *name)
8054 struct md_thread *thread;
8056 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
8060 init_waitqueue_head(&thread->wqueue);
8063 thread->mddev = mddev;
8064 thread->timeout = MAX_SCHEDULE_TIMEOUT;
8065 thread->tsk = kthread_run(md_thread, thread,
8067 mdname(thread->mddev),
8069 if (IS_ERR(thread->tsk)) {
8075 EXPORT_SYMBOL(md_register_thread);
8077 void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp)
8079 struct md_thread *thread = rcu_dereference_protected(*threadp,
8080 lockdep_is_held(&mddev->reconfig_mutex));
8085 rcu_assign_pointer(*threadp, NULL);
8088 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
8089 kthread_stop(thread->tsk);
8092 EXPORT_SYMBOL(md_unregister_thread);
8094 void md_error(struct mddev *mddev, struct md_rdev *rdev)
8096 if (!rdev || test_bit(Faulty, &rdev->flags))
8099 if (!mddev->pers || !mddev->pers->error_handler)
8101 mddev->pers->error_handler(mddev, rdev);
8103 if (mddev->pers->level == 0)
8106 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
8107 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8108 sysfs_notify_dirent_safe(rdev->sysfs_state);
8109 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8110 if (!test_bit(MD_BROKEN, &mddev->flags)) {
8111 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8112 md_wakeup_thread(mddev->thread);
8114 if (mddev->event_work.func)
8115 queue_work(md_misc_wq, &mddev->event_work);
8118 EXPORT_SYMBOL(md_error);
8120 /* seq_file implementation /proc/mdstat */
8122 static void status_unused(struct seq_file *seq)
8125 struct md_rdev *rdev;
8127 seq_printf(seq, "unused devices: ");
8129 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8131 seq_printf(seq, "%pg ", rdev->bdev);
8134 seq_printf(seq, "<none>");
8136 seq_printf(seq, "\n");
8139 static void status_personalities(struct seq_file *seq)
8141 struct md_personality *pers;
8143 seq_puts(seq, "Personalities : ");
8144 spin_lock(&pers_lock);
8145 list_for_each_entry(pers, &pers_list, list)
8146 seq_printf(seq, "[%s] ", pers->name);
8148 spin_unlock(&pers_lock);
8149 seq_puts(seq, "\n");
8152 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8154 sector_t max_sectors, resync, res;
8155 unsigned long dt, db = 0;
8156 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8157 int scale, recovery_active;
8158 unsigned int per_milli;
8160 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8161 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8162 max_sectors = mddev->resync_max_sectors;
8164 max_sectors = mddev->dev_sectors;
8166 resync = mddev->curr_resync;
8167 if (resync < MD_RESYNC_ACTIVE) {
8168 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8169 /* Still cleaning up */
8170 resync = max_sectors;
8171 } else if (resync > max_sectors) {
8172 resync = max_sectors;
8174 res = atomic_read(&mddev->recovery_active);
8176 * Resync has started, but the subtraction has overflowed or
8177 * yielded one of the special values. Force it to active to
8178 * ensure the status reports an active resync.
8180 if (resync < res || resync - res < MD_RESYNC_ACTIVE)
8181 resync = MD_RESYNC_ACTIVE;
8186 if (resync == MD_RESYNC_NONE) {
8187 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8188 struct md_rdev *rdev;
8190 rdev_for_each(rdev, mddev)
8191 if (rdev->raid_disk >= 0 &&
8192 !test_bit(Faulty, &rdev->flags) &&
8193 rdev->recovery_offset != MaxSector &&
8194 rdev->recovery_offset) {
8195 seq_printf(seq, "\trecover=REMOTE");
8198 if (mddev->reshape_position != MaxSector)
8199 seq_printf(seq, "\treshape=REMOTE");
8201 seq_printf(seq, "\tresync=REMOTE");
8204 if (mddev->recovery_cp < MaxSector) {
8205 seq_printf(seq, "\tresync=PENDING");
8210 if (resync < MD_RESYNC_ACTIVE) {
8211 seq_printf(seq, "\tresync=DELAYED");
8215 WARN_ON(max_sectors == 0);
8216 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8217 * in a sector_t, and (max_sectors>>scale) will fit in a
8218 * u32, as those are the requirements for sector_div.
8219 * Thus 'scale' must be at least 10
8222 if (sizeof(sector_t) > sizeof(unsigned long)) {
8223 while ( max_sectors/2 > (1ULL<<(scale+32)))
8226 res = (resync>>scale)*1000;
8227 sector_div(res, (u32)((max_sectors>>scale)+1));
8231 int i, x = per_milli/50, y = 20-x;
8232 seq_printf(seq, "[");
8233 for (i = 0; i < x; i++)
8234 seq_printf(seq, "=");
8235 seq_printf(seq, ">");
8236 for (i = 0; i < y; i++)
8237 seq_printf(seq, ".");
8238 seq_printf(seq, "] ");
8240 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8241 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8243 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8245 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8246 "resync" : "recovery"))),
8247 per_milli/10, per_milli % 10,
8248 (unsigned long long) resync/2,
8249 (unsigned long long) max_sectors/2);
8252 * dt: time from mark until now
8253 * db: blocks written from mark until now
8254 * rt: remaining time
8256 * rt is a sector_t, which is always 64bit now. We are keeping
8257 * the original algorithm, but it is not really necessary.
8259 * Original algorithm:
8260 * So we divide before multiply in case it is 32bit and close
8262 * We scale the divisor (db) by 32 to avoid losing precision
8263 * near the end of resync when the number of remaining sectors
8265 * We then divide rt by 32 after multiplying by db to compensate.
8266 * The '+1' avoids division by zero if db is very small.
8268 dt = ((jiffies - mddev->resync_mark) / HZ);
8271 curr_mark_cnt = mddev->curr_mark_cnt;
8272 recovery_active = atomic_read(&mddev->recovery_active);
8273 resync_mark_cnt = mddev->resync_mark_cnt;
8275 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8276 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8278 rt = max_sectors - resync; /* number of remaining sectors */
8279 rt = div64_u64(rt, db/32+1);
8283 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8284 ((unsigned long)rt % 60)/6);
8286 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8290 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8291 __acquires(&all_mddevs_lock)
8293 seq->poll_event = atomic_read(&md_event_count);
8294 spin_lock(&all_mddevs_lock);
8296 return seq_list_start_head(&all_mddevs, *pos);
8299 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8301 return seq_list_next(v, &all_mddevs, pos);
8304 static void md_seq_stop(struct seq_file *seq, void *v)
8305 __releases(&all_mddevs_lock)
8307 spin_unlock(&all_mddevs_lock);
8310 static int md_seq_show(struct seq_file *seq, void *v)
8312 struct mddev *mddev;
8314 struct md_rdev *rdev;
8316 if (v == &all_mddevs) {
8317 status_personalities(seq);
8318 if (list_empty(&all_mddevs))
8323 mddev = list_entry(v, struct mddev, all_mddevs);
8324 if (!mddev_get(mddev))
8327 spin_unlock(&all_mddevs_lock);
8328 spin_lock(&mddev->lock);
8329 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8330 seq_printf(seq, "%s : %sactive", mdname(mddev),
8331 mddev->pers ? "" : "in");
8333 if (mddev->ro == MD_RDONLY)
8334 seq_printf(seq, " (read-only)");
8335 if (mddev->ro == MD_AUTO_READ)
8336 seq_printf(seq, " (auto-read-only)");
8337 seq_printf(seq, " %s", mddev->pers->name);
8342 rdev_for_each_rcu(rdev, mddev) {
8343 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8345 if (test_bit(WriteMostly, &rdev->flags))
8346 seq_printf(seq, "(W)");
8347 if (test_bit(Journal, &rdev->flags))
8348 seq_printf(seq, "(J)");
8349 if (test_bit(Faulty, &rdev->flags)) {
8350 seq_printf(seq, "(F)");
8353 if (rdev->raid_disk < 0)
8354 seq_printf(seq, "(S)"); /* spare */
8355 if (test_bit(Replacement, &rdev->flags))
8356 seq_printf(seq, "(R)");
8357 sectors += rdev->sectors;
8361 if (!list_empty(&mddev->disks)) {
8363 seq_printf(seq, "\n %llu blocks",
8364 (unsigned long long)
8365 mddev->array_sectors / 2);
8367 seq_printf(seq, "\n %llu blocks",
8368 (unsigned long long)sectors / 2);
8370 if (mddev->persistent) {
8371 if (mddev->major_version != 0 ||
8372 mddev->minor_version != 90) {
8373 seq_printf(seq," super %d.%d",
8374 mddev->major_version,
8375 mddev->minor_version);
8377 } else if (mddev->external)
8378 seq_printf(seq, " super external:%s",
8379 mddev->metadata_type);
8381 seq_printf(seq, " super non-persistent");
8384 mddev->pers->status(seq, mddev);
8385 seq_printf(seq, "\n ");
8386 if (mddev->pers->sync_request) {
8387 if (status_resync(seq, mddev))
8388 seq_printf(seq, "\n ");
8391 seq_printf(seq, "\n ");
8393 md_bitmap_status(seq, mddev->bitmap);
8395 seq_printf(seq, "\n");
8397 spin_unlock(&mddev->lock);
8398 spin_lock(&all_mddevs_lock);
8400 if (mddev == list_last_entry(&all_mddevs, struct mddev, all_mddevs))
8403 if (atomic_dec_and_test(&mddev->active))
8409 static const struct seq_operations md_seq_ops = {
8410 .start = md_seq_start,
8411 .next = md_seq_next,
8412 .stop = md_seq_stop,
8413 .show = md_seq_show,
8416 static int md_seq_open(struct inode *inode, struct file *file)
8418 struct seq_file *seq;
8421 error = seq_open(file, &md_seq_ops);
8425 seq = file->private_data;
8426 seq->poll_event = atomic_read(&md_event_count);
8430 static int md_unloading;
8431 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8433 struct seq_file *seq = filp->private_data;
8437 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8438 poll_wait(filp, &md_event_waiters, wait);
8440 /* always allow read */
8441 mask = EPOLLIN | EPOLLRDNORM;
8443 if (seq->poll_event != atomic_read(&md_event_count))
8444 mask |= EPOLLERR | EPOLLPRI;
8448 static const struct proc_ops mdstat_proc_ops = {
8449 .proc_open = md_seq_open,
8450 .proc_read = seq_read,
8451 .proc_lseek = seq_lseek,
8452 .proc_release = seq_release,
8453 .proc_poll = mdstat_poll,
8456 int register_md_personality(struct md_personality *p)
8458 pr_debug("md: %s personality registered for level %d\n",
8460 spin_lock(&pers_lock);
8461 list_add_tail(&p->list, &pers_list);
8462 spin_unlock(&pers_lock);
8465 EXPORT_SYMBOL(register_md_personality);
8467 int unregister_md_personality(struct md_personality *p)
8469 pr_debug("md: %s personality unregistered\n", p->name);
8470 spin_lock(&pers_lock);
8471 list_del_init(&p->list);
8472 spin_unlock(&pers_lock);
8475 EXPORT_SYMBOL(unregister_md_personality);
8477 int register_md_cluster_operations(struct md_cluster_operations *ops,
8478 struct module *module)
8481 spin_lock(&pers_lock);
8482 if (md_cluster_ops != NULL)
8485 md_cluster_ops = ops;
8486 md_cluster_mod = module;
8488 spin_unlock(&pers_lock);
8491 EXPORT_SYMBOL(register_md_cluster_operations);
8493 int unregister_md_cluster_operations(void)
8495 spin_lock(&pers_lock);
8496 md_cluster_ops = NULL;
8497 spin_unlock(&pers_lock);
8500 EXPORT_SYMBOL(unregister_md_cluster_operations);
8502 int md_setup_cluster(struct mddev *mddev, int nodes)
8505 if (!md_cluster_ops)
8506 request_module("md-cluster");
8507 spin_lock(&pers_lock);
8508 /* ensure module won't be unloaded */
8509 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8510 pr_warn("can't find md-cluster module or get its reference.\n");
8511 spin_unlock(&pers_lock);
8514 spin_unlock(&pers_lock);
8516 ret = md_cluster_ops->join(mddev, nodes);
8518 mddev->safemode_delay = 0;
8522 void md_cluster_stop(struct mddev *mddev)
8524 if (!md_cluster_ops)
8526 md_cluster_ops->leave(mddev);
8527 module_put(md_cluster_mod);
8530 static int is_mddev_idle(struct mddev *mddev, int init)
8532 struct md_rdev *rdev;
8538 rdev_for_each_rcu(rdev, mddev) {
8539 struct gendisk *disk = rdev->bdev->bd_disk;
8540 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8541 atomic_read(&disk->sync_io);
8542 /* sync IO will cause sync_io to increase before the disk_stats
8543 * as sync_io is counted when a request starts, and
8544 * disk_stats is counted when it completes.
8545 * So resync activity will cause curr_events to be smaller than
8546 * when there was no such activity.
8547 * non-sync IO will cause disk_stat to increase without
8548 * increasing sync_io so curr_events will (eventually)
8549 * be larger than it was before. Once it becomes
8550 * substantially larger, the test below will cause
8551 * the array to appear non-idle, and resync will slow
8553 * If there is a lot of outstanding resync activity when
8554 * we set last_event to curr_events, then all that activity
8555 * completing might cause the array to appear non-idle
8556 * and resync will be slowed down even though there might
8557 * not have been non-resync activity. This will only
8558 * happen once though. 'last_events' will soon reflect
8559 * the state where there is little or no outstanding
8560 * resync requests, and further resync activity will
8561 * always make curr_events less than last_events.
8564 if (init || curr_events - rdev->last_events > 64) {
8565 rdev->last_events = curr_events;
8573 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8575 /* another "blocks" (512byte) blocks have been synced */
8576 atomic_sub(blocks, &mddev->recovery_active);
8577 wake_up(&mddev->recovery_wait);
8579 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8580 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8581 md_wakeup_thread(mddev->thread);
8582 // stop recovery, signal do_sync ....
8585 EXPORT_SYMBOL(md_done_sync);
8587 /* md_write_start(mddev, bi)
8588 * If we need to update some array metadata (e.g. 'active' flag
8589 * in superblock) before writing, schedule a superblock update
8590 * and wait for it to complete.
8591 * A return value of 'false' means that the write wasn't recorded
8592 * and cannot proceed as the array is being suspend.
8594 bool md_write_start(struct mddev *mddev, struct bio *bi)
8598 if (bio_data_dir(bi) != WRITE)
8601 BUG_ON(mddev->ro == MD_RDONLY);
8602 if (mddev->ro == MD_AUTO_READ) {
8603 /* need to switch to read/write */
8604 flush_work(&mddev->sync_work);
8605 mddev->ro = MD_RDWR;
8606 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8607 md_wakeup_thread(mddev->thread);
8608 md_wakeup_thread(mddev->sync_thread);
8612 percpu_ref_get(&mddev->writes_pending);
8613 smp_mb(); /* Match smp_mb in set_in_sync() */
8614 if (mddev->safemode == 1)
8615 mddev->safemode = 0;
8616 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8617 if (mddev->in_sync || mddev->sync_checkers) {
8618 spin_lock(&mddev->lock);
8619 if (mddev->in_sync) {
8621 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8622 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8623 md_wakeup_thread(mddev->thread);
8626 spin_unlock(&mddev->lock);
8630 sysfs_notify_dirent_safe(mddev->sysfs_state);
8631 if (!mddev->has_superblocks)
8633 wait_event(mddev->sb_wait,
8634 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8635 is_md_suspended(mddev));
8636 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8637 percpu_ref_put(&mddev->writes_pending);
8642 EXPORT_SYMBOL(md_write_start);
8644 /* md_write_inc can only be called when md_write_start() has
8645 * already been called at least once of the current request.
8646 * It increments the counter and is useful when a single request
8647 * is split into several parts. Each part causes an increment and
8648 * so needs a matching md_write_end().
8649 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8650 * a spinlocked region.
8652 void md_write_inc(struct mddev *mddev, struct bio *bi)
8654 if (bio_data_dir(bi) != WRITE)
8656 WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
8657 percpu_ref_get(&mddev->writes_pending);
8659 EXPORT_SYMBOL(md_write_inc);
8661 void md_write_end(struct mddev *mddev)
8663 percpu_ref_put(&mddev->writes_pending);
8665 if (mddev->safemode == 2)
8666 md_wakeup_thread(mddev->thread);
8667 else if (mddev->safemode_delay)
8668 /* The roundup() ensures this only performs locking once
8669 * every ->safemode_delay jiffies
8671 mod_timer(&mddev->safemode_timer,
8672 roundup(jiffies, mddev->safemode_delay) +
8673 mddev->safemode_delay);
8676 EXPORT_SYMBOL(md_write_end);
8678 /* This is used by raid0 and raid10 */
8679 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8680 struct bio *bio, sector_t start, sector_t size)
8682 struct bio *discard_bio = NULL;
8684 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8685 &discard_bio) || !discard_bio)
8688 bio_chain(discard_bio, bio);
8689 bio_clone_blkg_association(discard_bio, bio);
8691 trace_block_bio_remap(discard_bio,
8692 disk_devt(mddev->gendisk),
8693 bio->bi_iter.bi_sector);
8694 submit_bio_noacct(discard_bio);
8696 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8698 static void md_end_clone_io(struct bio *bio)
8700 struct md_io_clone *md_io_clone = bio->bi_private;
8701 struct bio *orig_bio = md_io_clone->orig_bio;
8702 struct mddev *mddev = md_io_clone->mddev;
8704 if (bio->bi_status && !orig_bio->bi_status)
8705 orig_bio->bi_status = bio->bi_status;
8707 if (md_io_clone->start_time)
8708 bio_end_io_acct(orig_bio, md_io_clone->start_time);
8711 bio_endio(orig_bio);
8712 percpu_ref_put(&mddev->active_io);
8715 static void md_clone_bio(struct mddev *mddev, struct bio **bio)
8717 struct block_device *bdev = (*bio)->bi_bdev;
8718 struct md_io_clone *md_io_clone;
8720 bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_clone_set);
8722 md_io_clone = container_of(clone, struct md_io_clone, bio_clone);
8723 md_io_clone->orig_bio = *bio;
8724 md_io_clone->mddev = mddev;
8725 if (blk_queue_io_stat(bdev->bd_disk->queue))
8726 md_io_clone->start_time = bio_start_io_acct(*bio);
8728 clone->bi_end_io = md_end_clone_io;
8729 clone->bi_private = md_io_clone;
8733 void md_account_bio(struct mddev *mddev, struct bio **bio)
8735 percpu_ref_get(&mddev->active_io);
8736 md_clone_bio(mddev, bio);
8738 EXPORT_SYMBOL_GPL(md_account_bio);
8740 /* md_allow_write(mddev)
8741 * Calling this ensures that the array is marked 'active' so that writes
8742 * may proceed without blocking. It is important to call this before
8743 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8744 * Must be called with mddev_lock held.
8746 void md_allow_write(struct mddev *mddev)
8750 if (!md_is_rdwr(mddev))
8752 if (!mddev->pers->sync_request)
8755 spin_lock(&mddev->lock);
8756 if (mddev->in_sync) {
8758 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8759 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8760 if (mddev->safemode_delay &&
8761 mddev->safemode == 0)
8762 mddev->safemode = 1;
8763 spin_unlock(&mddev->lock);
8764 md_update_sb(mddev, 0);
8765 sysfs_notify_dirent_safe(mddev->sysfs_state);
8766 /* wait for the dirty state to be recorded in the metadata */
8767 wait_event(mddev->sb_wait,
8768 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8770 spin_unlock(&mddev->lock);
8772 EXPORT_SYMBOL_GPL(md_allow_write);
8774 #define SYNC_MARKS 10
8775 #define SYNC_MARK_STEP (3*HZ)
8776 #define UPDATE_FREQUENCY (5*60*HZ)
8777 void md_do_sync(struct md_thread *thread)
8779 struct mddev *mddev = thread->mddev;
8780 struct mddev *mddev2;
8781 unsigned int currspeed = 0, window;
8782 sector_t max_sectors,j, io_sectors, recovery_done;
8783 unsigned long mark[SYNC_MARKS];
8784 unsigned long update_time;
8785 sector_t mark_cnt[SYNC_MARKS];
8787 sector_t last_check;
8789 struct md_rdev *rdev;
8790 char *desc, *action = NULL;
8791 struct blk_plug plug;
8794 /* just incase thread restarts... */
8795 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8798 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8801 if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) ||
8802 !md_is_rdwr(mddev)) {/* never try to sync a read-only array */
8803 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8807 if (mddev_is_clustered(mddev)) {
8808 ret = md_cluster_ops->resync_start(mddev);
8812 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8813 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8814 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8815 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8816 && ((unsigned long long)mddev->curr_resync_completed
8817 < (unsigned long long)mddev->resync_max_sectors))
8821 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8822 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8823 desc = "data-check";
8825 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8826 desc = "requested-resync";
8830 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8835 mddev->last_sync_action = action ?: desc;
8838 * Before starting a resync we must have set curr_resync to
8839 * 2, and then checked that every "conflicting" array has curr_resync
8840 * less than ours. When we find one that is the same or higher
8841 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8842 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8843 * This will mean we have to start checking from the beginning again.
8848 int mddev2_minor = -1;
8849 mddev->curr_resync = MD_RESYNC_DELAYED;
8852 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8854 spin_lock(&all_mddevs_lock);
8855 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) {
8856 if (test_bit(MD_DELETED, &mddev2->flags))
8858 if (mddev2 == mddev)
8860 if (!mddev->parallel_resync
8861 && mddev2->curr_resync
8862 && match_mddev_units(mddev, mddev2)) {
8864 if (mddev < mddev2 &&
8865 mddev->curr_resync == MD_RESYNC_DELAYED) {
8866 /* arbitrarily yield */
8867 mddev->curr_resync = MD_RESYNC_YIELDED;
8868 wake_up(&resync_wait);
8870 if (mddev > mddev2 &&
8871 mddev->curr_resync == MD_RESYNC_YIELDED)
8872 /* no need to wait here, we can wait the next
8873 * time 'round when curr_resync == 2
8876 /* We need to wait 'interruptible' so as not to
8877 * contribute to the load average, and not to
8878 * be caught by 'softlockup'
8880 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8881 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8882 mddev2->curr_resync >= mddev->curr_resync) {
8883 if (mddev2_minor != mddev2->md_minor) {
8884 mddev2_minor = mddev2->md_minor;
8885 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8886 desc, mdname(mddev),
8889 spin_unlock(&all_mddevs_lock);
8891 if (signal_pending(current))
8892 flush_signals(current);
8894 finish_wait(&resync_wait, &wq);
8897 finish_wait(&resync_wait, &wq);
8900 spin_unlock(&all_mddevs_lock);
8901 } while (mddev->curr_resync < MD_RESYNC_DELAYED);
8904 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8905 /* resync follows the size requested by the personality,
8906 * which defaults to physical size, but can be virtual size
8908 max_sectors = mddev->resync_max_sectors;
8909 atomic64_set(&mddev->resync_mismatches, 0);
8910 /* we don't use the checkpoint if there's a bitmap */
8911 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8912 j = mddev->resync_min;
8913 else if (!mddev->bitmap)
8914 j = mddev->recovery_cp;
8916 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8917 max_sectors = mddev->resync_max_sectors;
8919 * If the original node aborts reshaping then we continue the
8920 * reshaping, so set j again to avoid restart reshape from the
8923 if (mddev_is_clustered(mddev) &&
8924 mddev->reshape_position != MaxSector)
8925 j = mddev->reshape_position;
8927 /* recovery follows the physical size of devices */
8928 max_sectors = mddev->dev_sectors;
8931 rdev_for_each_rcu(rdev, mddev)
8932 if (rdev->raid_disk >= 0 &&
8933 !test_bit(Journal, &rdev->flags) &&
8934 !test_bit(Faulty, &rdev->flags) &&
8935 !test_bit(In_sync, &rdev->flags) &&
8936 rdev->recovery_offset < j)
8937 j = rdev->recovery_offset;
8940 /* If there is a bitmap, we need to make sure all
8941 * writes that started before we added a spare
8942 * complete before we start doing a recovery.
8943 * Otherwise the write might complete and (via
8944 * bitmap_endwrite) set a bit in the bitmap after the
8945 * recovery has checked that bit and skipped that
8948 if (mddev->bitmap) {
8949 mddev->pers->quiesce(mddev, 1);
8950 mddev->pers->quiesce(mddev, 0);
8954 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8955 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8956 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8957 speed_max(mddev), desc);
8959 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8962 for (m = 0; m < SYNC_MARKS; m++) {
8964 mark_cnt[m] = io_sectors;
8967 mddev->resync_mark = mark[last_mark];
8968 mddev->resync_mark_cnt = mark_cnt[last_mark];
8971 * Tune reconstruction:
8973 window = 32 * (PAGE_SIZE / 512);
8974 pr_debug("md: using %dk window, over a total of %lluk.\n",
8975 window/2, (unsigned long long)max_sectors/2);
8977 atomic_set(&mddev->recovery_active, 0);
8980 if (j >= MD_RESYNC_ACTIVE) {
8981 pr_debug("md: resuming %s of %s from checkpoint.\n",
8982 desc, mdname(mddev));
8983 mddev->curr_resync = j;
8985 mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */
8986 mddev->curr_resync_completed = j;
8987 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8989 update_time = jiffies;
8991 blk_start_plug(&plug);
8992 while (j < max_sectors) {
8997 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8998 ((mddev->curr_resync > mddev->curr_resync_completed &&
8999 (mddev->curr_resync - mddev->curr_resync_completed)
9000 > (max_sectors >> 4)) ||
9001 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
9002 (j - mddev->curr_resync_completed)*2
9003 >= mddev->resync_max - mddev->curr_resync_completed ||
9004 mddev->curr_resync_completed > mddev->resync_max
9006 /* time to update curr_resync_completed */
9007 wait_event(mddev->recovery_wait,
9008 atomic_read(&mddev->recovery_active) == 0);
9009 mddev->curr_resync_completed = j;
9010 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
9011 j > mddev->recovery_cp)
9012 mddev->recovery_cp = j;
9013 update_time = jiffies;
9014 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
9015 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9018 while (j >= mddev->resync_max &&
9019 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9020 /* As this condition is controlled by user-space,
9021 * we can block indefinitely, so use '_interruptible'
9022 * to avoid triggering warnings.
9024 flush_signals(current); /* just in case */
9025 wait_event_interruptible(mddev->recovery_wait,
9026 mddev->resync_max > j
9027 || test_bit(MD_RECOVERY_INTR,
9031 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9034 sectors = mddev->pers->sync_request(mddev, j, &skipped);
9036 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9040 if (!skipped) { /* actual IO requested */
9041 io_sectors += sectors;
9042 atomic_add(sectors, &mddev->recovery_active);
9045 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9049 if (j > max_sectors)
9050 /* when skipping, extra large numbers can be returned. */
9052 if (j >= MD_RESYNC_ACTIVE)
9053 mddev->curr_resync = j;
9054 mddev->curr_mark_cnt = io_sectors;
9055 if (last_check == 0)
9056 /* this is the earliest that rebuild will be
9057 * visible in /proc/mdstat
9061 if (last_check + window > io_sectors || j == max_sectors)
9064 last_check = io_sectors;
9066 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
9068 int next = (last_mark+1) % SYNC_MARKS;
9070 mddev->resync_mark = mark[next];
9071 mddev->resync_mark_cnt = mark_cnt[next];
9072 mark[next] = jiffies;
9073 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
9077 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9081 * this loop exits only if either when we are slower than
9082 * the 'hard' speed limit, or the system was IO-idle for
9084 * the system might be non-idle CPU-wise, but we only care
9085 * about not overloading the IO subsystem. (things like an
9086 * e2fsck being done on the RAID array should execute fast)
9090 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9091 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9092 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9094 if (currspeed > speed_min(mddev)) {
9095 if (currspeed > speed_max(mddev)) {
9099 if (!is_mddev_idle(mddev, 0)) {
9101 * Give other IO more of a chance.
9102 * The faster the devices, the less we wait.
9104 wait_event(mddev->recovery_wait,
9105 !atomic_read(&mddev->recovery_active));
9109 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9110 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9111 ? "interrupted" : "done");
9113 * this also signals 'finished resyncing' to md_stop
9115 blk_finish_plug(&plug);
9116 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9118 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9119 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9120 mddev->curr_resync >= MD_RESYNC_ACTIVE) {
9121 mddev->curr_resync_completed = mddev->curr_resync;
9122 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9124 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9126 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9127 mddev->curr_resync > MD_RESYNC_ACTIVE) {
9128 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9129 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9130 if (mddev->curr_resync >= mddev->recovery_cp) {
9131 pr_debug("md: checkpointing %s of %s.\n",
9132 desc, mdname(mddev));
9133 if (test_bit(MD_RECOVERY_ERROR,
9135 mddev->recovery_cp =
9136 mddev->curr_resync_completed;
9138 mddev->recovery_cp =
9142 mddev->recovery_cp = MaxSector;
9144 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9145 mddev->curr_resync = MaxSector;
9146 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9147 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9149 rdev_for_each_rcu(rdev, mddev)
9150 if (rdev->raid_disk >= 0 &&
9151 mddev->delta_disks >= 0 &&
9152 !test_bit(Journal, &rdev->flags) &&
9153 !test_bit(Faulty, &rdev->flags) &&
9154 !test_bit(In_sync, &rdev->flags) &&
9155 rdev->recovery_offset < mddev->curr_resync)
9156 rdev->recovery_offset = mddev->curr_resync;
9162 /* set CHANGE_PENDING here since maybe another update is needed,
9163 * so other nodes are informed. It should be harmless for normal
9165 set_mask_bits(&mddev->sb_flags, 0,
9166 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9168 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9169 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9170 mddev->delta_disks > 0 &&
9171 mddev->pers->finish_reshape &&
9172 mddev->pers->size &&
9174 mddev_lock_nointr(mddev);
9175 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9176 mddev_unlock(mddev);
9177 if (!mddev_is_clustered(mddev))
9178 set_capacity_and_notify(mddev->gendisk,
9179 mddev->array_sectors);
9182 spin_lock(&mddev->lock);
9183 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9184 /* We completed so min/max setting can be forgotten if used. */
9185 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9186 mddev->resync_min = 0;
9187 mddev->resync_max = MaxSector;
9188 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9189 mddev->resync_min = mddev->curr_resync_completed;
9190 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9191 mddev->curr_resync = MD_RESYNC_NONE;
9192 spin_unlock(&mddev->lock);
9194 wake_up(&resync_wait);
9195 md_wakeup_thread(mddev->thread);
9198 EXPORT_SYMBOL_GPL(md_do_sync);
9200 static bool rdev_removeable(struct md_rdev *rdev)
9202 /* rdev is not used. */
9203 if (rdev->raid_disk < 0)
9206 /* There are still inflight io, don't remove this rdev. */
9207 if (atomic_read(&rdev->nr_pending))
9211 * An error occurred but has not yet been acknowledged by the metadata
9212 * handler, don't remove this rdev.
9214 if (test_bit(Blocked, &rdev->flags))
9217 /* Fautly rdev is not used, it's safe to remove it. */
9218 if (test_bit(Faulty, &rdev->flags))
9221 /* Journal disk can only be removed if it's faulty. */
9222 if (test_bit(Journal, &rdev->flags))
9226 * 'In_sync' is cleared while 'raid_disk' is valid, which means
9227 * replacement has just become active from pers->spare_active(), and
9228 * then pers->hot_remove_disk() will replace this rdev with replacement.
9230 if (!test_bit(In_sync, &rdev->flags))
9236 static bool rdev_is_spare(struct md_rdev *rdev)
9238 return !test_bit(Candidate, &rdev->flags) && rdev->raid_disk >= 0 &&
9239 !test_bit(In_sync, &rdev->flags) &&
9240 !test_bit(Journal, &rdev->flags) &&
9241 !test_bit(Faulty, &rdev->flags);
9244 static bool rdev_addable(struct md_rdev *rdev)
9246 /* rdev is already used, don't add it again. */
9247 if (test_bit(Candidate, &rdev->flags) || rdev->raid_disk >= 0 ||
9248 test_bit(Faulty, &rdev->flags))
9251 /* Allow to add journal disk. */
9252 if (test_bit(Journal, &rdev->flags))
9255 /* Allow to add if array is read-write. */
9256 if (md_is_rdwr(rdev->mddev))
9260 * For read-only array, only allow to readd a rdev. And if bitmap is
9261 * used, don't allow to readd a rdev that is too old.
9263 if (rdev->saved_raid_disk >= 0 && !test_bit(Bitmap_sync, &rdev->flags))
9269 static bool md_spares_need_change(struct mddev *mddev)
9271 struct md_rdev *rdev;
9273 rdev_for_each(rdev, mddev)
9274 if (rdev_removeable(rdev) || rdev_addable(rdev))
9279 static int remove_and_add_spares(struct mddev *mddev,
9280 struct md_rdev *this)
9282 struct md_rdev *rdev;
9286 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9287 /* Mustn't remove devices when resync thread is running */
9290 rdev_for_each(rdev, mddev) {
9291 if ((this == NULL || rdev == this) && rdev_removeable(rdev) &&
9292 !mddev->pers->hot_remove_disk(mddev, rdev)) {
9293 sysfs_unlink_rdev(mddev, rdev);
9294 rdev->saved_raid_disk = rdev->raid_disk;
9295 rdev->raid_disk = -1;
9300 if (removed && mddev->kobj.sd)
9301 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9303 if (this && removed)
9306 rdev_for_each(rdev, mddev) {
9307 if (this && this != rdev)
9309 if (rdev_is_spare(rdev))
9311 if (!rdev_addable(rdev))
9313 if (!test_bit(Journal, &rdev->flags))
9314 rdev->recovery_offset = 0;
9315 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9316 /* failure here is OK */
9317 sysfs_link_rdev(mddev, rdev);
9318 if (!test_bit(Journal, &rdev->flags))
9321 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9326 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9330 static bool md_choose_sync_action(struct mddev *mddev, int *spares)
9332 /* Check if reshape is in progress first. */
9333 if (mddev->reshape_position != MaxSector) {
9334 if (mddev->pers->check_reshape == NULL ||
9335 mddev->pers->check_reshape(mddev) != 0)
9338 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9339 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9344 * Remove any failed drives, then add spares if possible. Spares are
9345 * also removed and re-added, to allow the personality to fail the
9348 *spares = remove_and_add_spares(mddev, NULL);
9350 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9351 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9352 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9354 /* Start new recovery. */
9355 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9359 /* Check if recovery is in progress. */
9360 if (mddev->recovery_cp < MaxSector) {
9361 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9362 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9366 /* Delay to choose resync/check/repair in md_do_sync(). */
9367 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9370 /* Nothing to be done */
9374 static void md_start_sync(struct work_struct *ws)
9376 struct mddev *mddev = container_of(ws, struct mddev, sync_work);
9378 bool suspend = false;
9382 * If reshape is still in progress, spares won't be added or removed
9383 * from conf until reshape is done.
9385 if (mddev->reshape_position == MaxSector &&
9386 md_spares_need_change(mddev)) {
9388 mddev_suspend(mddev, false);
9391 mddev_lock_nointr(mddev);
9392 if (!md_is_rdwr(mddev)) {
9394 * On a read-only array we can:
9395 * - remove failed devices
9396 * - add already-in_sync devices if the array itself is in-sync.
9397 * As we only add devices that are already in-sync, we can
9398 * activate the spares immediately.
9400 remove_and_add_spares(mddev, NULL);
9404 if (!md_choose_sync_action(mddev, &spares))
9407 if (!mddev->pers->sync_request)
9411 * We are adding a device or devices to an array which has the bitmap
9412 * stored on all devices. So make sure all bitmap pages get written.
9415 md_bitmap_write_all(mddev->bitmap);
9417 name = test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ?
9418 "reshape" : "resync";
9419 rcu_assign_pointer(mddev->sync_thread,
9420 md_register_thread(md_do_sync, mddev, name));
9421 if (!mddev->sync_thread) {
9422 pr_warn("%s: could not start resync thread...\n",
9424 /* leave the spares where they are, it shouldn't hurt */
9428 mddev_unlock(mddev);
9430 * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should
9431 * not set it again. Otherwise, we may cause issue like this one:
9432 * https://bugzilla.kernel.org/show_bug.cgi?id=218200
9433 * Therefore, use __mddev_resume(mddev, false).
9436 __mddev_resume(mddev, false);
9437 md_wakeup_thread(mddev->sync_thread);
9438 sysfs_notify_dirent_safe(mddev->sysfs_action);
9443 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9444 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9445 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9446 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9447 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9448 mddev_unlock(mddev);
9450 * md_start_sync was triggered by MD_RECOVERY_NEEDED, so we should
9451 * not set it again. Otherwise, we may cause issue like this one:
9452 * https://bugzilla.kernel.org/show_bug.cgi?id=218200
9453 * Therefore, use __mddev_resume(mddev, false).
9456 __mddev_resume(mddev, false);
9458 wake_up(&resync_wait);
9459 if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
9460 mddev->sysfs_action)
9461 sysfs_notify_dirent_safe(mddev->sysfs_action);
9464 static void unregister_sync_thread(struct mddev *mddev)
9466 if (!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9467 /* resync/recovery still happening */
9468 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9472 if (WARN_ON_ONCE(!mddev->sync_thread))
9475 md_reap_sync_thread(mddev);
9479 * This routine is regularly called by all per-raid-array threads to
9480 * deal with generic issues like resync and super-block update.
9481 * Raid personalities that don't have a thread (linear/raid0) do not
9482 * need this as they never do any recovery or update the superblock.
9484 * It does not do any resync itself, but rather "forks" off other threads
9485 * to do that as needed.
9486 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9487 * "->recovery" and create a thread at ->sync_thread.
9488 * When the thread finishes it sets MD_RECOVERY_DONE
9489 * and wakeups up this thread which will reap the thread and finish up.
9490 * This thread also removes any faulty devices (with nr_pending == 0).
9492 * The overall approach is:
9493 * 1/ if the superblock needs updating, update it.
9494 * 2/ If a recovery thread is running, don't do anything else.
9495 * 3/ If recovery has finished, clean up, possibly marking spares active.
9496 * 4/ If there are any faulty devices, remove them.
9497 * 5/ If array is degraded, try to add spares devices
9498 * 6/ If array has spares or is not in-sync, start a resync thread.
9500 void md_check_recovery(struct mddev *mddev)
9503 md_bitmap_daemon_work(mddev);
9505 if (signal_pending(current)) {
9506 if (mddev->pers->sync_request && !mddev->external) {
9507 pr_debug("md: %s in immediate safe mode\n",
9509 mddev->safemode = 2;
9511 flush_signals(current);
9514 if (!md_is_rdwr(mddev) &&
9515 !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) &&
9516 !test_bit(MD_RECOVERY_DONE, &mddev->recovery))
9519 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9520 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9521 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9522 (mddev->external == 0 && mddev->safemode == 1) ||
9523 (mddev->safemode == 2
9524 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9528 if (mddev_trylock(mddev)) {
9529 bool try_set_sync = mddev->safemode != 0;
9531 if (!mddev->external && mddev->safemode == 1)
9532 mddev->safemode = 0;
9534 if (!md_is_rdwr(mddev)) {
9535 struct md_rdev *rdev;
9537 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9538 unregister_sync_thread(mddev);
9542 if (!mddev->external && mddev->in_sync)
9544 * 'Blocked' flag not needed as failed devices
9545 * will be recorded if array switched to read/write.
9546 * Leaving it set will prevent the device
9547 * from being removed.
9549 rdev_for_each(rdev, mddev)
9550 clear_bit(Blocked, &rdev->flags);
9553 * There is no thread, but we need to call
9554 * ->spare_active and clear saved_raid_disk
9556 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9557 md_reap_sync_thread(mddev);
9560 * Let md_start_sync() to remove and add rdevs to the
9563 if (md_spares_need_change(mddev)) {
9564 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9565 queue_work(md_misc_wq, &mddev->sync_work);
9568 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9569 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9570 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9575 if (mddev_is_clustered(mddev)) {
9576 struct md_rdev *rdev, *tmp;
9577 /* kick the device if another node issued a
9580 rdev_for_each_safe(rdev, tmp, mddev) {
9581 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9582 rdev->raid_disk < 0)
9583 md_kick_rdev_from_array(rdev);
9587 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9588 spin_lock(&mddev->lock);
9590 spin_unlock(&mddev->lock);
9593 if (mddev->sb_flags)
9594 md_update_sb(mddev, 0);
9597 * Never start a new sync thread if MD_RECOVERY_RUNNING is
9600 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9601 unregister_sync_thread(mddev);
9605 /* Set RUNNING before clearing NEEDED to avoid
9606 * any transients in the value of "sync_action".
9608 mddev->curr_resync_completed = 0;
9609 spin_lock(&mddev->lock);
9610 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9611 spin_unlock(&mddev->lock);
9612 /* Clear some bits that don't mean anything, but
9615 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9616 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9618 if (test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) &&
9619 !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
9620 queue_work(md_misc_wq, &mddev->sync_work);
9622 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9623 wake_up(&resync_wait);
9627 wake_up(&mddev->sb_wait);
9628 mddev_unlock(mddev);
9631 EXPORT_SYMBOL(md_check_recovery);
9633 void md_reap_sync_thread(struct mddev *mddev)
9635 struct md_rdev *rdev;
9636 sector_t old_dev_sectors = mddev->dev_sectors;
9637 bool is_reshaped = false;
9639 /* resync has finished, collect result */
9640 md_unregister_thread(mddev, &mddev->sync_thread);
9641 atomic_inc(&mddev->sync_seq);
9643 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9644 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9645 mddev->degraded != mddev->raid_disks) {
9647 /* activate any spares */
9648 if (mddev->pers->spare_active(mddev)) {
9649 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9650 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9653 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9654 mddev->pers->finish_reshape) {
9655 mddev->pers->finish_reshape(mddev);
9656 if (mddev_is_clustered(mddev))
9660 /* If array is no-longer degraded, then any saved_raid_disk
9661 * information must be scrapped.
9663 if (!mddev->degraded)
9664 rdev_for_each(rdev, mddev)
9665 rdev->saved_raid_disk = -1;
9667 md_update_sb(mddev, 1);
9668 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9669 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9671 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9672 md_cluster_ops->resync_finish(mddev);
9673 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9674 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9675 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9676 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9677 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9678 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9680 * We call md_cluster_ops->update_size here because sync_size could
9681 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9682 * so it is time to update size across cluster.
9684 if (mddev_is_clustered(mddev) && is_reshaped
9685 && !test_bit(MD_CLOSING, &mddev->flags))
9686 md_cluster_ops->update_size(mddev, old_dev_sectors);
9687 /* flag recovery needed just to double check */
9688 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9689 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9690 sysfs_notify_dirent_safe(mddev->sysfs_action);
9692 if (mddev->event_work.func)
9693 queue_work(md_misc_wq, &mddev->event_work);
9694 wake_up(&resync_wait);
9696 EXPORT_SYMBOL(md_reap_sync_thread);
9698 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9700 sysfs_notify_dirent_safe(rdev->sysfs_state);
9701 wait_event_timeout(rdev->blocked_wait,
9702 !test_bit(Blocked, &rdev->flags) &&
9703 !test_bit(BlockedBadBlocks, &rdev->flags),
9704 msecs_to_jiffies(5000));
9705 rdev_dec_pending(rdev, mddev);
9707 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9709 void md_finish_reshape(struct mddev *mddev)
9711 /* called be personality module when reshape completes. */
9712 struct md_rdev *rdev;
9714 rdev_for_each(rdev, mddev) {
9715 if (rdev->data_offset > rdev->new_data_offset)
9716 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9718 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9719 rdev->data_offset = rdev->new_data_offset;
9722 EXPORT_SYMBOL(md_finish_reshape);
9724 /* Bad block management */
9726 /* Returns 1 on success, 0 on failure */
9727 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9730 struct mddev *mddev = rdev->mddev;
9733 s += rdev->new_data_offset;
9735 s += rdev->data_offset;
9736 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9738 /* Make sure they get written out promptly */
9739 if (test_bit(ExternalBbl, &rdev->flags))
9740 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9741 sysfs_notify_dirent_safe(rdev->sysfs_state);
9742 set_mask_bits(&mddev->sb_flags, 0,
9743 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9744 md_wakeup_thread(rdev->mddev->thread);
9749 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9751 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9756 s += rdev->new_data_offset;
9758 s += rdev->data_offset;
9759 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9760 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9761 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9764 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9766 static int md_notify_reboot(struct notifier_block *this,
9767 unsigned long code, void *x)
9769 struct mddev *mddev, *n;
9772 spin_lock(&all_mddevs_lock);
9773 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9774 if (!mddev_get(mddev))
9776 spin_unlock(&all_mddevs_lock);
9777 if (mddev_trylock(mddev)) {
9779 __md_stop_writes(mddev);
9780 if (mddev->persistent)
9781 mddev->safemode = 2;
9782 mddev_unlock(mddev);
9786 spin_lock(&all_mddevs_lock);
9788 spin_unlock(&all_mddevs_lock);
9791 * certain more exotic SCSI devices are known to be
9792 * volatile wrt too early system reboots. While the
9793 * right place to handle this issue is the given
9794 * driver, we do want to have a safe RAID driver ...
9802 static struct notifier_block md_notifier = {
9803 .notifier_call = md_notify_reboot,
9805 .priority = INT_MAX, /* before any real devices */
9808 static void md_geninit(void)
9810 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9812 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9815 static int __init md_init(void)
9819 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9823 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9827 md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND,
9832 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9836 ret = __register_blkdev(0, "mdp", md_probe);
9841 register_reboot_notifier(&md_notifier);
9842 raid_table_header = register_sysctl("dev/raid", raid_table);
9848 unregister_blkdev(MD_MAJOR, "md");
9850 destroy_workqueue(md_bitmap_wq);
9852 destroy_workqueue(md_misc_wq);
9854 destroy_workqueue(md_wq);
9859 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9861 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9862 struct md_rdev *rdev2, *tmp;
9866 * If size is changed in another node then we need to
9867 * do resize as well.
9869 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9870 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9872 pr_info("md-cluster: resize failed\n");
9874 md_bitmap_update_sb(mddev->bitmap);
9877 /* Check for change of roles in the active devices */
9878 rdev_for_each_safe(rdev2, tmp, mddev) {
9879 if (test_bit(Faulty, &rdev2->flags))
9882 /* Check if the roles changed */
9883 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9885 if (test_bit(Candidate, &rdev2->flags)) {
9886 if (role == MD_DISK_ROLE_FAULTY) {
9887 pr_info("md: Removing Candidate device %pg because add failed\n",
9889 md_kick_rdev_from_array(rdev2);
9893 clear_bit(Candidate, &rdev2->flags);
9896 if (role != rdev2->raid_disk) {
9898 * got activated except reshape is happening.
9900 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9901 !(le32_to_cpu(sb->feature_map) &
9902 MD_FEATURE_RESHAPE_ACTIVE)) {
9903 rdev2->saved_raid_disk = role;
9904 ret = remove_and_add_spares(mddev, rdev2);
9905 pr_info("Activated spare: %pg\n",
9907 /* wakeup mddev->thread here, so array could
9908 * perform resync with the new activated disk */
9909 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9910 md_wakeup_thread(mddev->thread);
9913 * We just want to do the minimum to mark the disk
9914 * as faulty. The recovery is performed by the
9915 * one who initiated the error.
9917 if (role == MD_DISK_ROLE_FAULTY ||
9918 role == MD_DISK_ROLE_JOURNAL) {
9919 md_error(mddev, rdev2);
9920 clear_bit(Blocked, &rdev2->flags);
9925 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9926 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9928 pr_warn("md: updating array disks failed. %d\n", ret);
9932 * Since mddev->delta_disks has already updated in update_raid_disks,
9933 * so it is time to check reshape.
9935 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9936 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9938 * reshape is happening in the remote node, we need to
9939 * update reshape_position and call start_reshape.
9941 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9942 if (mddev->pers->update_reshape_pos)
9943 mddev->pers->update_reshape_pos(mddev);
9944 if (mddev->pers->start_reshape)
9945 mddev->pers->start_reshape(mddev);
9946 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9947 mddev->reshape_position != MaxSector &&
9948 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9949 /* reshape is just done in another node. */
9950 mddev->reshape_position = MaxSector;
9951 if (mddev->pers->update_reshape_pos)
9952 mddev->pers->update_reshape_pos(mddev);
9955 /* Finally set the event to be up to date */
9956 mddev->events = le64_to_cpu(sb->events);
9959 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9962 struct page *swapout = rdev->sb_page;
9963 struct mdp_superblock_1 *sb;
9965 /* Store the sb page of the rdev in the swapout temporary
9966 * variable in case we err in the future
9968 rdev->sb_page = NULL;
9969 err = alloc_disk_sb(rdev);
9971 ClearPageUptodate(rdev->sb_page);
9972 rdev->sb_loaded = 0;
9973 err = super_types[mddev->major_version].
9974 load_super(rdev, NULL, mddev->minor_version);
9977 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9978 __func__, __LINE__, rdev->desc_nr, err);
9980 put_page(rdev->sb_page);
9981 rdev->sb_page = swapout;
9982 rdev->sb_loaded = 1;
9986 sb = page_address(rdev->sb_page);
9987 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9991 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9992 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9994 /* The other node finished recovery, call spare_active to set
9995 * device In_sync and mddev->degraded
9997 if (rdev->recovery_offset == MaxSector &&
9998 !test_bit(In_sync, &rdev->flags) &&
9999 mddev->pers->spare_active(mddev))
10000 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
10006 void md_reload_sb(struct mddev *mddev, int nr)
10008 struct md_rdev *rdev = NULL, *iter;
10011 /* Find the rdev */
10012 rdev_for_each_rcu(iter, mddev) {
10013 if (iter->desc_nr == nr) {
10020 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
10024 err = read_rdev(mddev, rdev);
10028 check_sb_changes(mddev, rdev);
10030 /* Read all rdev's to update recovery_offset */
10031 rdev_for_each_rcu(rdev, mddev) {
10032 if (!test_bit(Faulty, &rdev->flags))
10033 read_rdev(mddev, rdev);
10036 EXPORT_SYMBOL(md_reload_sb);
10041 * Searches all registered partitions for autorun RAID arrays
10045 static DEFINE_MUTEX(detected_devices_mutex);
10046 static LIST_HEAD(all_detected_devices);
10047 struct detected_devices_node {
10048 struct list_head list;
10052 void md_autodetect_dev(dev_t dev)
10054 struct detected_devices_node *node_detected_dev;
10056 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
10057 if (node_detected_dev) {
10058 node_detected_dev->dev = dev;
10059 mutex_lock(&detected_devices_mutex);
10060 list_add_tail(&node_detected_dev->list, &all_detected_devices);
10061 mutex_unlock(&detected_devices_mutex);
10065 void md_autostart_arrays(int part)
10067 struct md_rdev *rdev;
10068 struct detected_devices_node *node_detected_dev;
10070 int i_scanned, i_passed;
10075 pr_info("md: Autodetecting RAID arrays.\n");
10077 mutex_lock(&detected_devices_mutex);
10078 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
10080 node_detected_dev = list_entry(all_detected_devices.next,
10081 struct detected_devices_node, list);
10082 list_del(&node_detected_dev->list);
10083 dev = node_detected_dev->dev;
10084 kfree(node_detected_dev);
10085 mutex_unlock(&detected_devices_mutex);
10086 rdev = md_import_device(dev,0, 90);
10087 mutex_lock(&detected_devices_mutex);
10091 if (test_bit(Faulty, &rdev->flags))
10094 set_bit(AutoDetected, &rdev->flags);
10095 list_add(&rdev->same_set, &pending_raid_disks);
10098 mutex_unlock(&detected_devices_mutex);
10100 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
10102 autorun_devices(part);
10105 #endif /* !MODULE */
10107 static __exit void md_exit(void)
10109 struct mddev *mddev, *n;
10112 unregister_blkdev(MD_MAJOR,"md");
10113 unregister_blkdev(mdp_major, "mdp");
10114 unregister_reboot_notifier(&md_notifier);
10115 unregister_sysctl_table(raid_table_header);
10117 /* We cannot unload the modules while some process is
10118 * waiting for us in select() or poll() - wake them up
10121 while (waitqueue_active(&md_event_waiters)) {
10122 /* not safe to leave yet */
10123 wake_up(&md_event_waiters);
10127 remove_proc_entry("mdstat", NULL);
10129 spin_lock(&all_mddevs_lock);
10130 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
10131 if (!mddev_get(mddev))
10133 spin_unlock(&all_mddevs_lock);
10134 export_array(mddev);
10136 mddev->hold_active = 0;
10138 * As the mddev is now fully clear, mddev_put will schedule
10139 * the mddev for destruction by a workqueue, and the
10140 * destroy_workqueue() below will wait for that to complete.
10143 spin_lock(&all_mddevs_lock);
10145 spin_unlock(&all_mddevs_lock);
10147 destroy_workqueue(md_misc_wq);
10148 destroy_workqueue(md_bitmap_wq);
10149 destroy_workqueue(md_wq);
10152 subsys_initcall(md_init);
10153 module_exit(md_exit)
10155 static int get_ro(char *buffer, const struct kernel_param *kp)
10157 return sprintf(buffer, "%d\n", start_readonly);
10159 static int set_ro(const char *val, const struct kernel_param *kp)
10161 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
10164 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
10165 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
10166 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
10167 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
10169 MODULE_LICENSE("GPL");
10170 MODULE_DESCRIPTION("MD RAID framework");
10171 MODULE_ALIAS("md");
10172 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);