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;
85 static struct workqueue_struct *md_misc_wq;
86 struct workqueue_struct *md_bitmap_wq;
88 static int remove_and_add_spares(struct mddev *mddev,
89 struct md_rdev *this);
90 static void mddev_detach(struct mddev *mddev);
91 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev);
92 static void md_wakeup_thread_directly(struct md_thread __rcu *thread);
95 * Default number of read corrections we'll attempt on an rdev
96 * before ejecting it from the array. We divide the read error
97 * count by 2 for every hour elapsed between read errors.
99 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
100 /* Default safemode delay: 200 msec */
101 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
103 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
104 * is 1000 KB/sec, so the extra system load does not show up that much.
105 * Increase it if you want to have more _guaranteed_ speed. Note that
106 * the RAID driver will use the maximum available bandwidth if the IO
107 * subsystem is idle. There is also an 'absolute maximum' reconstruction
108 * speed limit - in case reconstruction slows down your system despite
111 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
112 * or /sys/block/mdX/md/sync_speed_{min,max}
115 static int sysctl_speed_limit_min = 1000;
116 static int sysctl_speed_limit_max = 200000;
117 static inline int speed_min(struct mddev *mddev)
119 return mddev->sync_speed_min ?
120 mddev->sync_speed_min : sysctl_speed_limit_min;
123 static inline int speed_max(struct mddev *mddev)
125 return mddev->sync_speed_max ?
126 mddev->sync_speed_max : sysctl_speed_limit_max;
129 static void rdev_uninit_serial(struct md_rdev *rdev)
131 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
134 kvfree(rdev->serial);
138 static void rdevs_uninit_serial(struct mddev *mddev)
140 struct md_rdev *rdev;
142 rdev_for_each(rdev, mddev)
143 rdev_uninit_serial(rdev);
146 static int rdev_init_serial(struct md_rdev *rdev)
148 /* serial_nums equals with BARRIER_BUCKETS_NR */
149 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
150 struct serial_in_rdev *serial = NULL;
152 if (test_bit(CollisionCheck, &rdev->flags))
155 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
160 for (i = 0; i < serial_nums; i++) {
161 struct serial_in_rdev *serial_tmp = &serial[i];
163 spin_lock_init(&serial_tmp->serial_lock);
164 serial_tmp->serial_rb = RB_ROOT_CACHED;
165 init_waitqueue_head(&serial_tmp->serial_io_wait);
168 rdev->serial = serial;
169 set_bit(CollisionCheck, &rdev->flags);
174 static int rdevs_init_serial(struct mddev *mddev)
176 struct md_rdev *rdev;
179 rdev_for_each(rdev, mddev) {
180 ret = rdev_init_serial(rdev);
185 /* Free all resources if pool is not existed */
186 if (ret && !mddev->serial_info_pool)
187 rdevs_uninit_serial(mddev);
193 * rdev needs to enable serial stuffs if it meets the conditions:
194 * 1. it is multi-queue device flaged with writemostly.
195 * 2. the write-behind mode is enabled.
197 static int rdev_need_serial(struct md_rdev *rdev)
199 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
200 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
201 test_bit(WriteMostly, &rdev->flags));
205 * Init resource for rdev(s), then create serial_info_pool if:
206 * 1. rdev is the first device which return true from rdev_enable_serial.
207 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
209 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
214 if (rdev && !rdev_need_serial(rdev) &&
215 !test_bit(CollisionCheck, &rdev->flags))
219 mddev_suspend(mddev);
222 ret = rdevs_init_serial(mddev);
224 ret = rdev_init_serial(rdev);
228 if (mddev->serial_info_pool == NULL) {
230 * already in memalloc noio context by
233 mddev->serial_info_pool =
234 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
235 sizeof(struct serial_info));
236 if (!mddev->serial_info_pool) {
237 rdevs_uninit_serial(mddev);
238 pr_err("can't alloc memory pool for serialization\n");
248 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
249 * 1. rdev is the last device flaged with CollisionCheck.
250 * 2. when bitmap is destroyed while policy is not enabled.
251 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
253 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
256 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
259 if (mddev->serial_info_pool) {
260 struct md_rdev *temp;
261 int num = 0; /* used to track if other rdevs need the pool */
264 mddev_suspend(mddev);
265 rdev_for_each(temp, mddev) {
267 if (!mddev->serialize_policy ||
268 !rdev_need_serial(temp))
269 rdev_uninit_serial(temp);
272 } else if (temp != rdev &&
273 test_bit(CollisionCheck, &temp->flags))
278 rdev_uninit_serial(rdev);
281 pr_info("The mempool could be used by other devices\n");
283 mempool_destroy(mddev->serial_info_pool);
284 mddev->serial_info_pool = NULL;
291 static struct ctl_table_header *raid_table_header;
293 static struct ctl_table raid_table[] = {
295 .procname = "speed_limit_min",
296 .data = &sysctl_speed_limit_min,
297 .maxlen = sizeof(int),
298 .mode = S_IRUGO|S_IWUSR,
299 .proc_handler = proc_dointvec,
302 .procname = "speed_limit_max",
303 .data = &sysctl_speed_limit_max,
304 .maxlen = sizeof(int),
305 .mode = S_IRUGO|S_IWUSR,
306 .proc_handler = proc_dointvec,
311 static int start_readonly;
314 * The original mechanism for creating an md device is to create
315 * a device node in /dev and to open it. This causes races with device-close.
316 * The preferred method is to write to the "new_array" module parameter.
317 * This can avoid races.
318 * Setting create_on_open to false disables the original mechanism
319 * so all the races disappear.
321 static bool create_on_open = true;
324 * We have a system wide 'event count' that is incremented
325 * on any 'interesting' event, and readers of /proc/mdstat
326 * can use 'poll' or 'select' to find out when the event
330 * start array, stop array, error, add device, remove device,
331 * start build, activate spare
333 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
334 static atomic_t md_event_count;
335 void md_new_event(void)
337 atomic_inc(&md_event_count);
338 wake_up(&md_event_waiters);
340 EXPORT_SYMBOL_GPL(md_new_event);
343 * Enables to iterate over all existing md arrays
344 * all_mddevs_lock protects this list.
346 static LIST_HEAD(all_mddevs);
347 static DEFINE_SPINLOCK(all_mddevs_lock);
349 /* Rather than calling directly into the personality make_request function,
350 * IO requests come here first so that we can check if the device is
351 * being suspended pending a reconfiguration.
352 * We hold a refcount over the call to ->make_request. By the time that
353 * call has finished, the bio has been linked into some internal structure
354 * and so is visible to ->quiesce(), so we don't need the refcount any more.
356 static bool is_suspended(struct mddev *mddev, struct bio *bio)
358 if (is_md_suspended(mddev))
360 if (bio_data_dir(bio) != WRITE)
362 if (mddev->suspend_lo >= mddev->suspend_hi)
364 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
366 if (bio_end_sector(bio) < mddev->suspend_lo)
371 void md_handle_request(struct mddev *mddev, struct bio *bio)
374 if (is_suspended(mddev, bio)) {
376 /* Bail out if REQ_NOWAIT is set for the bio */
377 if (bio->bi_opf & REQ_NOWAIT) {
378 bio_wouldblock_error(bio);
382 prepare_to_wait(&mddev->sb_wait, &__wait,
383 TASK_UNINTERRUPTIBLE);
384 if (!is_suspended(mddev, bio))
388 finish_wait(&mddev->sb_wait, &__wait);
390 if (!percpu_ref_tryget_live(&mddev->active_io))
391 goto check_suspended;
393 if (!mddev->pers->make_request(mddev, bio)) {
394 percpu_ref_put(&mddev->active_io);
395 goto check_suspended;
398 percpu_ref_put(&mddev->active_io);
400 EXPORT_SYMBOL(md_handle_request);
402 static void md_submit_bio(struct bio *bio)
404 const int rw = bio_data_dir(bio);
405 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
407 if (mddev == NULL || mddev->pers == NULL) {
412 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
417 bio = bio_split_to_limits(bio);
421 if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) {
422 if (bio_sectors(bio) != 0)
423 bio->bi_status = BLK_STS_IOERR;
428 /* bio could be mergeable after passing to underlayer */
429 bio->bi_opf &= ~REQ_NOMERGE;
431 md_handle_request(mddev, bio);
434 /* mddev_suspend makes sure no new requests are submitted
435 * to the device, and that any requests that have been submitted
436 * are completely handled.
437 * Once mddev_detach() is called and completes, the module will be
440 void mddev_suspend(struct mddev *mddev)
442 struct md_thread *thread = rcu_dereference_protected(mddev->thread,
443 lockdep_is_held(&mddev->reconfig_mutex));
445 WARN_ON_ONCE(thread && current == thread->tsk);
446 if (mddev->suspended++)
448 wake_up(&mddev->sb_wait);
449 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
450 percpu_ref_kill(&mddev->active_io);
452 if (mddev->pers->prepare_suspend)
453 mddev->pers->prepare_suspend(mddev);
455 wait_event(mddev->sb_wait, percpu_ref_is_zero(&mddev->active_io));
456 mddev->pers->quiesce(mddev, 1);
457 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
458 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
460 del_timer_sync(&mddev->safemode_timer);
461 /* restrict memory reclaim I/O during raid array is suspend */
462 mddev->noio_flag = memalloc_noio_save();
464 EXPORT_SYMBOL_GPL(mddev_suspend);
466 void mddev_resume(struct mddev *mddev)
468 /* entred the memalloc scope from mddev_suspend() */
469 memalloc_noio_restore(mddev->noio_flag);
470 lockdep_assert_held(&mddev->reconfig_mutex);
471 if (--mddev->suspended)
473 percpu_ref_resurrect(&mddev->active_io);
474 wake_up(&mddev->sb_wait);
475 mddev->pers->quiesce(mddev, 0);
477 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
478 md_wakeup_thread(mddev->thread);
479 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
481 EXPORT_SYMBOL_GPL(mddev_resume);
484 * Generic flush handling for md
487 static void md_end_flush(struct bio *bio)
489 struct md_rdev *rdev = bio->bi_private;
490 struct mddev *mddev = rdev->mddev;
494 rdev_dec_pending(rdev, mddev);
496 if (atomic_dec_and_test(&mddev->flush_pending)) {
497 /* The pre-request flush has finished */
498 queue_work(md_wq, &mddev->flush_work);
502 static void md_submit_flush_data(struct work_struct *ws);
504 static void submit_flushes(struct work_struct *ws)
506 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
507 struct md_rdev *rdev;
509 mddev->start_flush = ktime_get_boottime();
510 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
511 atomic_set(&mddev->flush_pending, 1);
513 rdev_for_each_rcu(rdev, mddev)
514 if (rdev->raid_disk >= 0 &&
515 !test_bit(Faulty, &rdev->flags)) {
516 /* Take two references, one is dropped
517 * when request finishes, one after
518 * we reclaim rcu_read_lock
521 atomic_inc(&rdev->nr_pending);
522 atomic_inc(&rdev->nr_pending);
524 bi = bio_alloc_bioset(rdev->bdev, 0,
525 REQ_OP_WRITE | REQ_PREFLUSH,
526 GFP_NOIO, &mddev->bio_set);
527 bi->bi_end_io = md_end_flush;
528 bi->bi_private = rdev;
529 atomic_inc(&mddev->flush_pending);
532 rdev_dec_pending(rdev, mddev);
535 if (atomic_dec_and_test(&mddev->flush_pending))
536 queue_work(md_wq, &mddev->flush_work);
539 static void md_submit_flush_data(struct work_struct *ws)
541 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
542 struct bio *bio = mddev->flush_bio;
545 * must reset flush_bio before calling into md_handle_request to avoid a
546 * deadlock, because other bios passed md_handle_request suspend check
547 * could wait for this and below md_handle_request could wait for those
548 * bios because of suspend check
550 spin_lock_irq(&mddev->lock);
551 mddev->prev_flush_start = mddev->start_flush;
552 mddev->flush_bio = NULL;
553 spin_unlock_irq(&mddev->lock);
554 wake_up(&mddev->sb_wait);
556 if (bio->bi_iter.bi_size == 0) {
557 /* an empty barrier - all done */
560 bio->bi_opf &= ~REQ_PREFLUSH;
561 md_handle_request(mddev, bio);
566 * Manages consolidation of flushes and submitting any flushes needed for
567 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
568 * being finished in another context. Returns false if the flushing is
569 * complete but still needs the I/O portion of the bio to be processed.
571 bool md_flush_request(struct mddev *mddev, struct bio *bio)
573 ktime_t req_start = ktime_get_boottime();
574 spin_lock_irq(&mddev->lock);
575 /* flush requests wait until ongoing flush completes,
576 * hence coalescing all the pending requests.
578 wait_event_lock_irq(mddev->sb_wait,
580 ktime_before(req_start, mddev->prev_flush_start),
582 /* new request after previous flush is completed */
583 if (ktime_after(req_start, mddev->prev_flush_start)) {
584 WARN_ON(mddev->flush_bio);
585 mddev->flush_bio = bio;
588 spin_unlock_irq(&mddev->lock);
591 INIT_WORK(&mddev->flush_work, submit_flushes);
592 queue_work(md_wq, &mddev->flush_work);
594 /* flush was performed for some other bio while we waited. */
595 if (bio->bi_iter.bi_size == 0)
596 /* an empty barrier - all done */
599 bio->bi_opf &= ~REQ_PREFLUSH;
605 EXPORT_SYMBOL(md_flush_request);
607 static inline struct mddev *mddev_get(struct mddev *mddev)
609 lockdep_assert_held(&all_mddevs_lock);
611 if (test_bit(MD_DELETED, &mddev->flags))
613 atomic_inc(&mddev->active);
617 static void mddev_delayed_delete(struct work_struct *ws);
619 void mddev_put(struct mddev *mddev)
621 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
623 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
624 mddev->ctime == 0 && !mddev->hold_active) {
625 /* Array is not configured at all, and not held active,
627 set_bit(MD_DELETED, &mddev->flags);
630 * Call queue_work inside the spinlock so that
631 * flush_workqueue() after mddev_find will succeed in waiting
632 * for the work to be done.
634 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
635 queue_work(md_misc_wq, &mddev->del_work);
637 spin_unlock(&all_mddevs_lock);
640 static void md_safemode_timeout(struct timer_list *t);
642 void mddev_init(struct mddev *mddev)
644 mutex_init(&mddev->open_mutex);
645 mutex_init(&mddev->reconfig_mutex);
646 mutex_init(&mddev->sync_mutex);
647 mutex_init(&mddev->bitmap_info.mutex);
648 INIT_LIST_HEAD(&mddev->disks);
649 INIT_LIST_HEAD(&mddev->all_mddevs);
650 INIT_LIST_HEAD(&mddev->deleting);
651 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
652 atomic_set(&mddev->active, 1);
653 atomic_set(&mddev->openers, 0);
654 spin_lock_init(&mddev->lock);
655 atomic_set(&mddev->flush_pending, 0);
656 init_waitqueue_head(&mddev->sb_wait);
657 init_waitqueue_head(&mddev->recovery_wait);
658 mddev->reshape_position = MaxSector;
659 mddev->reshape_backwards = 0;
660 mddev->last_sync_action = "none";
661 mddev->resync_min = 0;
662 mddev->resync_max = MaxSector;
663 mddev->level = LEVEL_NONE;
665 EXPORT_SYMBOL_GPL(mddev_init);
667 static struct mddev *mddev_find_locked(dev_t unit)
671 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
672 if (mddev->unit == unit)
678 /* find an unused unit number */
679 static dev_t mddev_alloc_unit(void)
681 static int next_minor = 512;
682 int start = next_minor;
687 dev = MKDEV(MD_MAJOR, next_minor);
689 if (next_minor > MINORMASK)
691 if (next_minor == start)
692 return 0; /* Oh dear, all in use. */
693 is_free = !mddev_find_locked(dev);
699 static struct mddev *mddev_alloc(dev_t unit)
704 if (unit && MAJOR(unit) != MD_MAJOR)
705 unit &= ~((1 << MdpMinorShift) - 1);
707 new = kzalloc(sizeof(*new), GFP_KERNEL);
709 return ERR_PTR(-ENOMEM);
712 spin_lock(&all_mddevs_lock);
715 if (mddev_find_locked(unit))
718 if (MAJOR(unit) == MD_MAJOR)
719 new->md_minor = MINOR(unit);
721 new->md_minor = MINOR(unit) >> MdpMinorShift;
722 new->hold_active = UNTIL_IOCTL;
725 new->unit = mddev_alloc_unit();
728 new->md_minor = MINOR(new->unit);
729 new->hold_active = UNTIL_STOP;
732 list_add(&new->all_mddevs, &all_mddevs);
733 spin_unlock(&all_mddevs_lock);
736 spin_unlock(&all_mddevs_lock);
738 return ERR_PTR(error);
741 static void mddev_free(struct mddev *mddev)
743 spin_lock(&all_mddevs_lock);
744 list_del(&mddev->all_mddevs);
745 spin_unlock(&all_mddevs_lock);
750 static const struct attribute_group md_redundancy_group;
752 void mddev_unlock(struct mddev *mddev)
754 struct md_rdev *rdev;
758 if (!list_empty(&mddev->deleting))
759 list_splice_init(&mddev->deleting, &delete);
761 if (mddev->to_remove) {
762 /* These cannot be removed under reconfig_mutex as
763 * an access to the files will try to take reconfig_mutex
764 * while holding the file unremovable, which leads to
766 * So hold set sysfs_active while the remove in happeing,
767 * and anything else which might set ->to_remove or my
768 * otherwise change the sysfs namespace will fail with
769 * -EBUSY if sysfs_active is still set.
770 * We set sysfs_active under reconfig_mutex and elsewhere
771 * test it under the same mutex to ensure its correct value
774 const struct attribute_group *to_remove = mddev->to_remove;
775 mddev->to_remove = NULL;
776 mddev->sysfs_active = 1;
777 mutex_unlock(&mddev->reconfig_mutex);
779 if (mddev->kobj.sd) {
780 if (to_remove != &md_redundancy_group)
781 sysfs_remove_group(&mddev->kobj, to_remove);
782 if (mddev->pers == NULL ||
783 mddev->pers->sync_request == NULL) {
784 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
785 if (mddev->sysfs_action)
786 sysfs_put(mddev->sysfs_action);
787 if (mddev->sysfs_completed)
788 sysfs_put(mddev->sysfs_completed);
789 if (mddev->sysfs_degraded)
790 sysfs_put(mddev->sysfs_degraded);
791 mddev->sysfs_action = NULL;
792 mddev->sysfs_completed = NULL;
793 mddev->sysfs_degraded = NULL;
796 mddev->sysfs_active = 0;
798 mutex_unlock(&mddev->reconfig_mutex);
800 list_for_each_entry_safe(rdev, tmp, &delete, same_set) {
801 list_del_init(&rdev->same_set);
802 kobject_del(&rdev->kobj);
803 export_rdev(rdev, mddev);
806 md_wakeup_thread(mddev->thread);
807 wake_up(&mddev->sb_wait);
809 EXPORT_SYMBOL_GPL(mddev_unlock);
811 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
813 struct md_rdev *rdev;
815 rdev_for_each_rcu(rdev, mddev)
816 if (rdev->desc_nr == nr)
821 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
823 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
825 struct md_rdev *rdev;
827 rdev_for_each(rdev, mddev)
828 if (rdev->bdev->bd_dev == dev)
834 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
836 struct md_rdev *rdev;
838 rdev_for_each_rcu(rdev, mddev)
839 if (rdev->bdev->bd_dev == dev)
844 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
846 static struct md_personality *find_pers(int level, char *clevel)
848 struct md_personality *pers;
849 list_for_each_entry(pers, &pers_list, list) {
850 if (level != LEVEL_NONE && pers->level == level)
852 if (strcmp(pers->name, clevel)==0)
858 /* return the offset of the super block in 512byte sectors */
859 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
861 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
864 static int alloc_disk_sb(struct md_rdev *rdev)
866 rdev->sb_page = alloc_page(GFP_KERNEL);
872 void md_rdev_clear(struct md_rdev *rdev)
875 put_page(rdev->sb_page);
877 rdev->sb_page = NULL;
882 put_page(rdev->bb_page);
883 rdev->bb_page = NULL;
885 badblocks_exit(&rdev->badblocks);
887 EXPORT_SYMBOL_GPL(md_rdev_clear);
889 static void super_written(struct bio *bio)
891 struct md_rdev *rdev = bio->bi_private;
892 struct mddev *mddev = rdev->mddev;
894 if (bio->bi_status) {
895 pr_err("md: %s gets error=%d\n", __func__,
896 blk_status_to_errno(bio->bi_status));
897 md_error(mddev, rdev);
898 if (!test_bit(Faulty, &rdev->flags)
899 && (bio->bi_opf & MD_FAILFAST)) {
900 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
901 set_bit(LastDev, &rdev->flags);
904 clear_bit(LastDev, &rdev->flags);
908 rdev_dec_pending(rdev, mddev);
910 if (atomic_dec_and_test(&mddev->pending_writes))
911 wake_up(&mddev->sb_wait);
914 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
915 sector_t sector, int size, struct page *page)
917 /* write first size bytes of page to sector of rdev
918 * Increment mddev->pending_writes before returning
919 * and decrement it on completion, waking up sb_wait
920 * if zero is reached.
921 * If an error occurred, call md_error
928 if (test_bit(Faulty, &rdev->flags))
931 bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
933 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA,
934 GFP_NOIO, &mddev->sync_set);
936 atomic_inc(&rdev->nr_pending);
938 bio->bi_iter.bi_sector = sector;
939 __bio_add_page(bio, page, size, 0);
940 bio->bi_private = rdev;
941 bio->bi_end_io = super_written;
943 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
944 test_bit(FailFast, &rdev->flags) &&
945 !test_bit(LastDev, &rdev->flags))
946 bio->bi_opf |= MD_FAILFAST;
948 atomic_inc(&mddev->pending_writes);
952 int md_super_wait(struct mddev *mddev)
954 /* wait for all superblock writes that were scheduled to complete */
955 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
956 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
961 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
962 struct page *page, blk_opf_t opf, bool metadata_op)
967 if (metadata_op && rdev->meta_bdev)
968 bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
970 bio_init(&bio, rdev->bdev, &bvec, 1, opf);
973 bio.bi_iter.bi_sector = sector + rdev->sb_start;
974 else if (rdev->mddev->reshape_position != MaxSector &&
975 (rdev->mddev->reshape_backwards ==
976 (sector >= rdev->mddev->reshape_position)))
977 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
979 bio.bi_iter.bi_sector = sector + rdev->data_offset;
980 __bio_add_page(&bio, page, size, 0);
982 submit_bio_wait(&bio);
984 return !bio.bi_status;
986 EXPORT_SYMBOL_GPL(sync_page_io);
988 static int read_disk_sb(struct md_rdev *rdev, int size)
993 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true))
999 pr_err("md: disabled device %pg, could not read superblock.\n",
1004 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1006 return sb1->set_uuid0 == sb2->set_uuid0 &&
1007 sb1->set_uuid1 == sb2->set_uuid1 &&
1008 sb1->set_uuid2 == sb2->set_uuid2 &&
1009 sb1->set_uuid3 == sb2->set_uuid3;
1012 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1015 mdp_super_t *tmp1, *tmp2;
1017 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1018 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1020 if (!tmp1 || !tmp2) {
1029 * nr_disks is not constant
1034 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1041 static u32 md_csum_fold(u32 csum)
1043 csum = (csum & 0xffff) + (csum >> 16);
1044 return (csum & 0xffff) + (csum >> 16);
1047 static unsigned int calc_sb_csum(mdp_super_t *sb)
1050 u32 *sb32 = (u32*)sb;
1052 unsigned int disk_csum, csum;
1054 disk_csum = sb->sb_csum;
1057 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1059 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1062 /* This used to use csum_partial, which was wrong for several
1063 * reasons including that different results are returned on
1064 * different architectures. It isn't critical that we get exactly
1065 * the same return value as before (we always csum_fold before
1066 * testing, and that removes any differences). However as we
1067 * know that csum_partial always returned a 16bit value on
1068 * alphas, do a fold to maximise conformity to previous behaviour.
1070 sb->sb_csum = md_csum_fold(disk_csum);
1072 sb->sb_csum = disk_csum;
1078 * Handle superblock details.
1079 * We want to be able to handle multiple superblock formats
1080 * so we have a common interface to them all, and an array of
1081 * different handlers.
1082 * We rely on user-space to write the initial superblock, and support
1083 * reading and updating of superblocks.
1084 * Interface methods are:
1085 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1086 * loads and validates a superblock on dev.
1087 * if refdev != NULL, compare superblocks on both devices
1089 * 0 - dev has a superblock that is compatible with refdev
1090 * 1 - dev has a superblock that is compatible and newer than refdev
1091 * so dev should be used as the refdev in future
1092 * -EINVAL superblock incompatible or invalid
1093 * -othererror e.g. -EIO
1095 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1096 * Verify that dev is acceptable into mddev.
1097 * The first time, mddev->raid_disks will be 0, and data from
1098 * dev should be merged in. Subsequent calls check that dev
1099 * is new enough. Return 0 or -EINVAL
1101 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1102 * Update the superblock for rdev with data in mddev
1103 * This does not write to disc.
1109 struct module *owner;
1110 int (*load_super)(struct md_rdev *rdev,
1111 struct md_rdev *refdev,
1113 int (*validate_super)(struct mddev *mddev,
1114 struct md_rdev *rdev);
1115 void (*sync_super)(struct mddev *mddev,
1116 struct md_rdev *rdev);
1117 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1118 sector_t num_sectors);
1119 int (*allow_new_offset)(struct md_rdev *rdev,
1120 unsigned long long new_offset);
1124 * Check that the given mddev has no bitmap.
1126 * This function is called from the run method of all personalities that do not
1127 * support bitmaps. It prints an error message and returns non-zero if mddev
1128 * has a bitmap. Otherwise, it returns 0.
1131 int md_check_no_bitmap(struct mddev *mddev)
1133 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1135 pr_warn("%s: bitmaps are not supported for %s\n",
1136 mdname(mddev), mddev->pers->name);
1139 EXPORT_SYMBOL(md_check_no_bitmap);
1142 * load_super for 0.90.0
1144 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1148 bool spare_disk = true;
1151 * Calculate the position of the superblock (512byte sectors),
1152 * it's at the end of the disk.
1154 * It also happens to be a multiple of 4Kb.
1156 rdev->sb_start = calc_dev_sboffset(rdev);
1158 ret = read_disk_sb(rdev, MD_SB_BYTES);
1164 sb = page_address(rdev->sb_page);
1166 if (sb->md_magic != MD_SB_MAGIC) {
1167 pr_warn("md: invalid raid superblock magic on %pg\n",
1172 if (sb->major_version != 0 ||
1173 sb->minor_version < 90 ||
1174 sb->minor_version > 91) {
1175 pr_warn("Bad version number %d.%d on %pg\n",
1176 sb->major_version, sb->minor_version, rdev->bdev);
1180 if (sb->raid_disks <= 0)
1183 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1184 pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
1188 rdev->preferred_minor = sb->md_minor;
1189 rdev->data_offset = 0;
1190 rdev->new_data_offset = 0;
1191 rdev->sb_size = MD_SB_BYTES;
1192 rdev->badblocks.shift = -1;
1194 if (sb->level == LEVEL_MULTIPATH)
1197 rdev->desc_nr = sb->this_disk.number;
1199 /* not spare disk, or LEVEL_MULTIPATH */
1200 if (sb->level == LEVEL_MULTIPATH ||
1201 (rdev->desc_nr >= 0 &&
1202 rdev->desc_nr < MD_SB_DISKS &&
1203 sb->disks[rdev->desc_nr].state &
1204 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1214 mdp_super_t *refsb = page_address(refdev->sb_page);
1215 if (!md_uuid_equal(refsb, sb)) {
1216 pr_warn("md: %pg has different UUID to %pg\n",
1217 rdev->bdev, refdev->bdev);
1220 if (!md_sb_equal(refsb, sb)) {
1221 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1222 rdev->bdev, refdev->bdev);
1226 ev2 = md_event(refsb);
1228 if (!spare_disk && ev1 > ev2)
1233 rdev->sectors = rdev->sb_start;
1234 /* Limit to 4TB as metadata cannot record more than that.
1235 * (not needed for Linear and RAID0 as metadata doesn't
1238 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1239 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1241 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1242 /* "this cannot possibly happen" ... */
1250 * validate_super for 0.90.0
1252 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1255 mdp_super_t *sb = page_address(rdev->sb_page);
1256 __u64 ev1 = md_event(sb);
1258 rdev->raid_disk = -1;
1259 clear_bit(Faulty, &rdev->flags);
1260 clear_bit(In_sync, &rdev->flags);
1261 clear_bit(Bitmap_sync, &rdev->flags);
1262 clear_bit(WriteMostly, &rdev->flags);
1264 if (mddev->raid_disks == 0) {
1265 mddev->major_version = 0;
1266 mddev->minor_version = sb->minor_version;
1267 mddev->patch_version = sb->patch_version;
1268 mddev->external = 0;
1269 mddev->chunk_sectors = sb->chunk_size >> 9;
1270 mddev->ctime = sb->ctime;
1271 mddev->utime = sb->utime;
1272 mddev->level = sb->level;
1273 mddev->clevel[0] = 0;
1274 mddev->layout = sb->layout;
1275 mddev->raid_disks = sb->raid_disks;
1276 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1277 mddev->events = ev1;
1278 mddev->bitmap_info.offset = 0;
1279 mddev->bitmap_info.space = 0;
1280 /* bitmap can use 60 K after the 4K superblocks */
1281 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1282 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1283 mddev->reshape_backwards = 0;
1285 if (mddev->minor_version >= 91) {
1286 mddev->reshape_position = sb->reshape_position;
1287 mddev->delta_disks = sb->delta_disks;
1288 mddev->new_level = sb->new_level;
1289 mddev->new_layout = sb->new_layout;
1290 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1291 if (mddev->delta_disks < 0)
1292 mddev->reshape_backwards = 1;
1294 mddev->reshape_position = MaxSector;
1295 mddev->delta_disks = 0;
1296 mddev->new_level = mddev->level;
1297 mddev->new_layout = mddev->layout;
1298 mddev->new_chunk_sectors = mddev->chunk_sectors;
1300 if (mddev->level == 0)
1303 if (sb->state & (1<<MD_SB_CLEAN))
1304 mddev->recovery_cp = MaxSector;
1306 if (sb->events_hi == sb->cp_events_hi &&
1307 sb->events_lo == sb->cp_events_lo) {
1308 mddev->recovery_cp = sb->recovery_cp;
1310 mddev->recovery_cp = 0;
1313 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1314 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1315 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1316 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1318 mddev->max_disks = MD_SB_DISKS;
1320 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1321 mddev->bitmap_info.file == NULL) {
1322 mddev->bitmap_info.offset =
1323 mddev->bitmap_info.default_offset;
1324 mddev->bitmap_info.space =
1325 mddev->bitmap_info.default_space;
1328 } else if (mddev->pers == NULL) {
1329 /* Insist on good event counter while assembling, except
1330 * for spares (which don't need an event count) */
1332 if (sb->disks[rdev->desc_nr].state & (
1333 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1334 if (ev1 < mddev->events)
1336 } else if (mddev->bitmap) {
1337 /* if adding to array with a bitmap, then we can accept an
1338 * older device ... but not too old.
1340 if (ev1 < mddev->bitmap->events_cleared)
1342 if (ev1 < mddev->events)
1343 set_bit(Bitmap_sync, &rdev->flags);
1345 if (ev1 < mddev->events)
1346 /* just a hot-add of a new device, leave raid_disk at -1 */
1350 if (mddev->level != LEVEL_MULTIPATH) {
1351 desc = sb->disks + rdev->desc_nr;
1353 if (desc->state & (1<<MD_DISK_FAULTY))
1354 set_bit(Faulty, &rdev->flags);
1355 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1356 desc->raid_disk < mddev->raid_disks */) {
1357 set_bit(In_sync, &rdev->flags);
1358 rdev->raid_disk = desc->raid_disk;
1359 rdev->saved_raid_disk = desc->raid_disk;
1360 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1361 /* active but not in sync implies recovery up to
1362 * reshape position. We don't know exactly where
1363 * that is, so set to zero for now */
1364 if (mddev->minor_version >= 91) {
1365 rdev->recovery_offset = 0;
1366 rdev->raid_disk = desc->raid_disk;
1369 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1370 set_bit(WriteMostly, &rdev->flags);
1371 if (desc->state & (1<<MD_DISK_FAILFAST))
1372 set_bit(FailFast, &rdev->flags);
1373 } else /* MULTIPATH are always insync */
1374 set_bit(In_sync, &rdev->flags);
1379 * sync_super for 0.90.0
1381 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1384 struct md_rdev *rdev2;
1385 int next_spare = mddev->raid_disks;
1387 /* make rdev->sb match mddev data..
1390 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1391 * 3/ any empty disks < next_spare become removed
1393 * disks[0] gets initialised to REMOVED because
1394 * we cannot be sure from other fields if it has
1395 * been initialised or not.
1398 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1400 rdev->sb_size = MD_SB_BYTES;
1402 sb = page_address(rdev->sb_page);
1404 memset(sb, 0, sizeof(*sb));
1406 sb->md_magic = MD_SB_MAGIC;
1407 sb->major_version = mddev->major_version;
1408 sb->patch_version = mddev->patch_version;
1409 sb->gvalid_words = 0; /* ignored */
1410 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1411 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1412 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1413 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1415 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1416 sb->level = mddev->level;
1417 sb->size = mddev->dev_sectors / 2;
1418 sb->raid_disks = mddev->raid_disks;
1419 sb->md_minor = mddev->md_minor;
1420 sb->not_persistent = 0;
1421 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1423 sb->events_hi = (mddev->events>>32);
1424 sb->events_lo = (u32)mddev->events;
1426 if (mddev->reshape_position == MaxSector)
1427 sb->minor_version = 90;
1429 sb->minor_version = 91;
1430 sb->reshape_position = mddev->reshape_position;
1431 sb->new_level = mddev->new_level;
1432 sb->delta_disks = mddev->delta_disks;
1433 sb->new_layout = mddev->new_layout;
1434 sb->new_chunk = mddev->new_chunk_sectors << 9;
1436 mddev->minor_version = sb->minor_version;
1439 sb->recovery_cp = mddev->recovery_cp;
1440 sb->cp_events_hi = (mddev->events>>32);
1441 sb->cp_events_lo = (u32)mddev->events;
1442 if (mddev->recovery_cp == MaxSector)
1443 sb->state = (1<< MD_SB_CLEAN);
1445 sb->recovery_cp = 0;
1447 sb->layout = mddev->layout;
1448 sb->chunk_size = mddev->chunk_sectors << 9;
1450 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1451 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1453 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1454 rdev_for_each(rdev2, mddev) {
1457 int is_active = test_bit(In_sync, &rdev2->flags);
1459 if (rdev2->raid_disk >= 0 &&
1460 sb->minor_version >= 91)
1461 /* we have nowhere to store the recovery_offset,
1462 * but if it is not below the reshape_position,
1463 * we can piggy-back on that.
1466 if (rdev2->raid_disk < 0 ||
1467 test_bit(Faulty, &rdev2->flags))
1470 desc_nr = rdev2->raid_disk;
1472 desc_nr = next_spare++;
1473 rdev2->desc_nr = desc_nr;
1474 d = &sb->disks[rdev2->desc_nr];
1476 d->number = rdev2->desc_nr;
1477 d->major = MAJOR(rdev2->bdev->bd_dev);
1478 d->minor = MINOR(rdev2->bdev->bd_dev);
1480 d->raid_disk = rdev2->raid_disk;
1482 d->raid_disk = rdev2->desc_nr; /* compatibility */
1483 if (test_bit(Faulty, &rdev2->flags))
1484 d->state = (1<<MD_DISK_FAULTY);
1485 else if (is_active) {
1486 d->state = (1<<MD_DISK_ACTIVE);
1487 if (test_bit(In_sync, &rdev2->flags))
1488 d->state |= (1<<MD_DISK_SYNC);
1496 if (test_bit(WriteMostly, &rdev2->flags))
1497 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1498 if (test_bit(FailFast, &rdev2->flags))
1499 d->state |= (1<<MD_DISK_FAILFAST);
1501 /* now set the "removed" and "faulty" bits on any missing devices */
1502 for (i=0 ; i < mddev->raid_disks ; i++) {
1503 mdp_disk_t *d = &sb->disks[i];
1504 if (d->state == 0 && d->number == 0) {
1507 d->state = (1<<MD_DISK_REMOVED);
1508 d->state |= (1<<MD_DISK_FAULTY);
1512 sb->nr_disks = nr_disks;
1513 sb->active_disks = active;
1514 sb->working_disks = working;
1515 sb->failed_disks = failed;
1516 sb->spare_disks = spare;
1518 sb->this_disk = sb->disks[rdev->desc_nr];
1519 sb->sb_csum = calc_sb_csum(sb);
1523 * rdev_size_change for 0.90.0
1525 static unsigned long long
1526 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1528 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1529 return 0; /* component must fit device */
1530 if (rdev->mddev->bitmap_info.offset)
1531 return 0; /* can't move bitmap */
1532 rdev->sb_start = calc_dev_sboffset(rdev);
1533 if (!num_sectors || num_sectors > rdev->sb_start)
1534 num_sectors = rdev->sb_start;
1535 /* Limit to 4TB as metadata cannot record more than that.
1536 * 4TB == 2^32 KB, or 2*2^32 sectors.
1538 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1539 num_sectors = (sector_t)(2ULL << 32) - 2;
1541 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1543 } while (md_super_wait(rdev->mddev) < 0);
1548 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1550 /* non-zero offset changes not possible with v0.90 */
1551 return new_offset == 0;
1555 * version 1 superblock
1558 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1562 unsigned long long newcsum;
1563 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1564 __le32 *isuper = (__le32*)sb;
1566 disk_csum = sb->sb_csum;
1569 for (; size >= 4; size -= 4)
1570 newcsum += le32_to_cpu(*isuper++);
1573 newcsum += le16_to_cpu(*(__le16*) isuper);
1575 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1576 sb->sb_csum = disk_csum;
1577 return cpu_to_le32(csum);
1580 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1582 struct mdp_superblock_1 *sb;
1587 bool spare_disk = true;
1590 * Calculate the position of the superblock in 512byte sectors.
1591 * It is always aligned to a 4K boundary and
1592 * depeding on minor_version, it can be:
1593 * 0: At least 8K, but less than 12K, from end of device
1594 * 1: At start of device
1595 * 2: 4K from start of device.
1597 switch(minor_version) {
1599 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1600 sb_start &= ~(sector_t)(4*2-1);
1611 rdev->sb_start = sb_start;
1613 /* superblock is rarely larger than 1K, but it can be larger,
1614 * and it is safe to read 4k, so we do that
1616 ret = read_disk_sb(rdev, 4096);
1617 if (ret) return ret;
1619 sb = page_address(rdev->sb_page);
1621 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1622 sb->major_version != cpu_to_le32(1) ||
1623 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1624 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1625 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1628 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1629 pr_warn("md: invalid superblock checksum on %pg\n",
1633 if (le64_to_cpu(sb->data_size) < 10) {
1634 pr_warn("md: data_size too small on %pg\n",
1640 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1641 /* Some padding is non-zero, might be a new feature */
1644 rdev->preferred_minor = 0xffff;
1645 rdev->data_offset = le64_to_cpu(sb->data_offset);
1646 rdev->new_data_offset = rdev->data_offset;
1647 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1648 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1649 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1650 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1652 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1653 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1654 if (rdev->sb_size & bmask)
1655 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1658 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1661 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1664 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1667 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1669 if (!rdev->bb_page) {
1670 rdev->bb_page = alloc_page(GFP_KERNEL);
1674 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1675 rdev->badblocks.count == 0) {
1676 /* need to load the bad block list.
1677 * Currently we limit it to one page.
1683 int sectors = le16_to_cpu(sb->bblog_size);
1684 if (sectors > (PAGE_SIZE / 512))
1686 offset = le32_to_cpu(sb->bblog_offset);
1689 bb_sector = (long long)offset;
1690 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1691 rdev->bb_page, REQ_OP_READ, true))
1693 bbp = (__le64 *)page_address(rdev->bb_page);
1694 rdev->badblocks.shift = sb->bblog_shift;
1695 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1696 u64 bb = le64_to_cpu(*bbp);
1697 int count = bb & (0x3ff);
1698 u64 sector = bb >> 10;
1699 sector <<= sb->bblog_shift;
1700 count <<= sb->bblog_shift;
1703 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1706 } else if (sb->bblog_offset != 0)
1707 rdev->badblocks.shift = 0;
1709 if ((le32_to_cpu(sb->feature_map) &
1710 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1711 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1712 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1713 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1716 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1720 /* not spare disk, or LEVEL_MULTIPATH */
1721 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1722 (rdev->desc_nr >= 0 &&
1723 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1724 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1725 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1735 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1737 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1738 sb->level != refsb->level ||
1739 sb->layout != refsb->layout ||
1740 sb->chunksize != refsb->chunksize) {
1741 pr_warn("md: %pg has strangely different superblock to %pg\n",
1746 ev1 = le64_to_cpu(sb->events);
1747 ev2 = le64_to_cpu(refsb->events);
1749 if (!spare_disk && ev1 > ev2)
1755 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1757 sectors = rdev->sb_start;
1758 if (sectors < le64_to_cpu(sb->data_size))
1760 rdev->sectors = le64_to_cpu(sb->data_size);
1764 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1766 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1767 __u64 ev1 = le64_to_cpu(sb->events);
1769 rdev->raid_disk = -1;
1770 clear_bit(Faulty, &rdev->flags);
1771 clear_bit(In_sync, &rdev->flags);
1772 clear_bit(Bitmap_sync, &rdev->flags);
1773 clear_bit(WriteMostly, &rdev->flags);
1775 if (mddev->raid_disks == 0) {
1776 mddev->major_version = 1;
1777 mddev->patch_version = 0;
1778 mddev->external = 0;
1779 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1780 mddev->ctime = le64_to_cpu(sb->ctime);
1781 mddev->utime = le64_to_cpu(sb->utime);
1782 mddev->level = le32_to_cpu(sb->level);
1783 mddev->clevel[0] = 0;
1784 mddev->layout = le32_to_cpu(sb->layout);
1785 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1786 mddev->dev_sectors = le64_to_cpu(sb->size);
1787 mddev->events = ev1;
1788 mddev->bitmap_info.offset = 0;
1789 mddev->bitmap_info.space = 0;
1790 /* Default location for bitmap is 1K after superblock
1791 * using 3K - total of 4K
1793 mddev->bitmap_info.default_offset = 1024 >> 9;
1794 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1795 mddev->reshape_backwards = 0;
1797 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1798 memcpy(mddev->uuid, sb->set_uuid, 16);
1800 mddev->max_disks = (4096-256)/2;
1802 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1803 mddev->bitmap_info.file == NULL) {
1804 mddev->bitmap_info.offset =
1805 (__s32)le32_to_cpu(sb->bitmap_offset);
1806 /* Metadata doesn't record how much space is available.
1807 * For 1.0, we assume we can use up to the superblock
1808 * if before, else to 4K beyond superblock.
1809 * For others, assume no change is possible.
1811 if (mddev->minor_version > 0)
1812 mddev->bitmap_info.space = 0;
1813 else if (mddev->bitmap_info.offset > 0)
1814 mddev->bitmap_info.space =
1815 8 - mddev->bitmap_info.offset;
1817 mddev->bitmap_info.space =
1818 -mddev->bitmap_info.offset;
1821 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1822 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1823 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1824 mddev->new_level = le32_to_cpu(sb->new_level);
1825 mddev->new_layout = le32_to_cpu(sb->new_layout);
1826 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1827 if (mddev->delta_disks < 0 ||
1828 (mddev->delta_disks == 0 &&
1829 (le32_to_cpu(sb->feature_map)
1830 & MD_FEATURE_RESHAPE_BACKWARDS)))
1831 mddev->reshape_backwards = 1;
1833 mddev->reshape_position = MaxSector;
1834 mddev->delta_disks = 0;
1835 mddev->new_level = mddev->level;
1836 mddev->new_layout = mddev->layout;
1837 mddev->new_chunk_sectors = mddev->chunk_sectors;
1840 if (mddev->level == 0 &&
1841 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1844 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1845 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1847 if (le32_to_cpu(sb->feature_map) &
1848 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1849 if (le32_to_cpu(sb->feature_map) &
1850 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1852 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1853 (le32_to_cpu(sb->feature_map) &
1854 MD_FEATURE_MULTIPLE_PPLS))
1856 set_bit(MD_HAS_PPL, &mddev->flags);
1858 } else if (mddev->pers == NULL) {
1859 /* Insist of good event counter while assembling, except for
1860 * spares (which don't need an event count) */
1862 if (rdev->desc_nr >= 0 &&
1863 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1864 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1865 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1866 if (ev1 < mddev->events)
1868 } else if (mddev->bitmap) {
1869 /* If adding to array with a bitmap, then we can accept an
1870 * older device, but not too old.
1872 if (ev1 < mddev->bitmap->events_cleared)
1874 if (ev1 < mddev->events)
1875 set_bit(Bitmap_sync, &rdev->flags);
1877 if (ev1 < mddev->events)
1878 /* just a hot-add of a new device, leave raid_disk at -1 */
1881 if (mddev->level != LEVEL_MULTIPATH) {
1883 if (rdev->desc_nr < 0 ||
1884 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1885 role = MD_DISK_ROLE_SPARE;
1888 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1890 case MD_DISK_ROLE_SPARE: /* spare */
1892 case MD_DISK_ROLE_FAULTY: /* faulty */
1893 set_bit(Faulty, &rdev->flags);
1895 case MD_DISK_ROLE_JOURNAL: /* journal device */
1896 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1897 /* journal device without journal feature */
1898 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1901 set_bit(Journal, &rdev->flags);
1902 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1903 rdev->raid_disk = 0;
1906 rdev->saved_raid_disk = role;
1907 if ((le32_to_cpu(sb->feature_map) &
1908 MD_FEATURE_RECOVERY_OFFSET)) {
1909 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1910 if (!(le32_to_cpu(sb->feature_map) &
1911 MD_FEATURE_RECOVERY_BITMAP))
1912 rdev->saved_raid_disk = -1;
1915 * If the array is FROZEN, then the device can't
1916 * be in_sync with rest of array.
1918 if (!test_bit(MD_RECOVERY_FROZEN,
1920 set_bit(In_sync, &rdev->flags);
1922 rdev->raid_disk = role;
1925 if (sb->devflags & WriteMostly1)
1926 set_bit(WriteMostly, &rdev->flags);
1927 if (sb->devflags & FailFast1)
1928 set_bit(FailFast, &rdev->flags);
1929 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1930 set_bit(Replacement, &rdev->flags);
1931 } else /* MULTIPATH are always insync */
1932 set_bit(In_sync, &rdev->flags);
1937 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1939 struct mdp_superblock_1 *sb;
1940 struct md_rdev *rdev2;
1942 /* make rdev->sb match mddev and rdev data. */
1944 sb = page_address(rdev->sb_page);
1946 sb->feature_map = 0;
1948 sb->recovery_offset = cpu_to_le64(0);
1949 memset(sb->pad3, 0, sizeof(sb->pad3));
1951 sb->utime = cpu_to_le64((__u64)mddev->utime);
1952 sb->events = cpu_to_le64(mddev->events);
1954 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1955 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1956 sb->resync_offset = cpu_to_le64(MaxSector);
1958 sb->resync_offset = cpu_to_le64(0);
1960 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1962 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1963 sb->size = cpu_to_le64(mddev->dev_sectors);
1964 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1965 sb->level = cpu_to_le32(mddev->level);
1966 sb->layout = cpu_to_le32(mddev->layout);
1967 if (test_bit(FailFast, &rdev->flags))
1968 sb->devflags |= FailFast1;
1970 sb->devflags &= ~FailFast1;
1972 if (test_bit(WriteMostly, &rdev->flags))
1973 sb->devflags |= WriteMostly1;
1975 sb->devflags &= ~WriteMostly1;
1976 sb->data_offset = cpu_to_le64(rdev->data_offset);
1977 sb->data_size = cpu_to_le64(rdev->sectors);
1979 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1980 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1981 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1984 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1985 !test_bit(In_sync, &rdev->flags)) {
1987 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1988 sb->recovery_offset =
1989 cpu_to_le64(rdev->recovery_offset);
1990 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1992 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1994 /* Note: recovery_offset and journal_tail share space */
1995 if (test_bit(Journal, &rdev->flags))
1996 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1997 if (test_bit(Replacement, &rdev->flags))
1999 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2001 if (mddev->reshape_position != MaxSector) {
2002 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2003 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2004 sb->new_layout = cpu_to_le32(mddev->new_layout);
2005 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2006 sb->new_level = cpu_to_le32(mddev->new_level);
2007 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2008 if (mddev->delta_disks == 0 &&
2009 mddev->reshape_backwards)
2011 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2012 if (rdev->new_data_offset != rdev->data_offset) {
2014 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2015 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2016 - rdev->data_offset));
2020 if (mddev_is_clustered(mddev))
2021 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2023 if (rdev->badblocks.count == 0)
2024 /* Nothing to do for bad blocks*/ ;
2025 else if (sb->bblog_offset == 0)
2026 /* Cannot record bad blocks on this device */
2027 md_error(mddev, rdev);
2029 struct badblocks *bb = &rdev->badblocks;
2030 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2032 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2037 seq = read_seqbegin(&bb->lock);
2039 memset(bbp, 0xff, PAGE_SIZE);
2041 for (i = 0 ; i < bb->count ; i++) {
2042 u64 internal_bb = p[i];
2043 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2044 | BB_LEN(internal_bb));
2045 bbp[i] = cpu_to_le64(store_bb);
2048 if (read_seqretry(&bb->lock, seq))
2051 bb->sector = (rdev->sb_start +
2052 (int)le32_to_cpu(sb->bblog_offset));
2053 bb->size = le16_to_cpu(sb->bblog_size);
2058 rdev_for_each(rdev2, mddev)
2059 if (rdev2->desc_nr+1 > max_dev)
2060 max_dev = rdev2->desc_nr+1;
2062 if (max_dev > le32_to_cpu(sb->max_dev)) {
2064 sb->max_dev = cpu_to_le32(max_dev);
2065 rdev->sb_size = max_dev * 2 + 256;
2066 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2067 if (rdev->sb_size & bmask)
2068 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2070 max_dev = le32_to_cpu(sb->max_dev);
2072 for (i=0; i<max_dev;i++)
2073 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2075 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2076 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2078 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2079 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2081 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2083 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2084 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2085 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2088 rdev_for_each(rdev2, mddev) {
2090 if (test_bit(Faulty, &rdev2->flags))
2091 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2092 else if (test_bit(In_sync, &rdev2->flags))
2093 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2094 else if (test_bit(Journal, &rdev2->flags))
2095 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2096 else if (rdev2->raid_disk >= 0)
2097 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2099 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2102 sb->sb_csum = calc_sb_1_csum(sb);
2105 static sector_t super_1_choose_bm_space(sector_t dev_size)
2109 /* if the device is bigger than 8Gig, save 64k for bitmap
2110 * usage, if bigger than 200Gig, save 128k
2112 if (dev_size < 64*2)
2114 else if (dev_size - 64*2 >= 200*1024*1024*2)
2116 else if (dev_size - 4*2 > 8*1024*1024*2)
2123 static unsigned long long
2124 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2126 struct mdp_superblock_1 *sb;
2127 sector_t max_sectors;
2128 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2129 return 0; /* component must fit device */
2130 if (rdev->data_offset != rdev->new_data_offset)
2131 return 0; /* too confusing */
2132 if (rdev->sb_start < rdev->data_offset) {
2133 /* minor versions 1 and 2; superblock before data */
2134 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2135 if (!num_sectors || num_sectors > max_sectors)
2136 num_sectors = max_sectors;
2137 } else if (rdev->mddev->bitmap_info.offset) {
2138 /* minor version 0 with bitmap we can't move */
2141 /* minor version 0; superblock after data */
2142 sector_t sb_start, bm_space;
2143 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2145 /* 8K is for superblock */
2146 sb_start = dev_size - 8*2;
2147 sb_start &= ~(sector_t)(4*2 - 1);
2149 bm_space = super_1_choose_bm_space(dev_size);
2151 /* Space that can be used to store date needs to decrease
2152 * superblock bitmap space and bad block space(4K)
2154 max_sectors = sb_start - bm_space - 4*2;
2156 if (!num_sectors || num_sectors > max_sectors)
2157 num_sectors = max_sectors;
2158 rdev->sb_start = sb_start;
2160 sb = page_address(rdev->sb_page);
2161 sb->data_size = cpu_to_le64(num_sectors);
2162 sb->super_offset = cpu_to_le64(rdev->sb_start);
2163 sb->sb_csum = calc_sb_1_csum(sb);
2165 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2167 } while (md_super_wait(rdev->mddev) < 0);
2173 super_1_allow_new_offset(struct md_rdev *rdev,
2174 unsigned long long new_offset)
2176 /* All necessary checks on new >= old have been done */
2177 struct bitmap *bitmap;
2178 if (new_offset >= rdev->data_offset)
2181 /* with 1.0 metadata, there is no metadata to tread on
2182 * so we can always move back */
2183 if (rdev->mddev->minor_version == 0)
2186 /* otherwise we must be sure not to step on
2187 * any metadata, so stay:
2188 * 36K beyond start of superblock
2189 * beyond end of badblocks
2190 * beyond write-intent bitmap
2192 if (rdev->sb_start + (32+4)*2 > new_offset)
2194 bitmap = rdev->mddev->bitmap;
2195 if (bitmap && !rdev->mddev->bitmap_info.file &&
2196 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2197 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2199 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2205 static struct super_type super_types[] = {
2208 .owner = THIS_MODULE,
2209 .load_super = super_90_load,
2210 .validate_super = super_90_validate,
2211 .sync_super = super_90_sync,
2212 .rdev_size_change = super_90_rdev_size_change,
2213 .allow_new_offset = super_90_allow_new_offset,
2217 .owner = THIS_MODULE,
2218 .load_super = super_1_load,
2219 .validate_super = super_1_validate,
2220 .sync_super = super_1_sync,
2221 .rdev_size_change = super_1_rdev_size_change,
2222 .allow_new_offset = super_1_allow_new_offset,
2226 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2228 if (mddev->sync_super) {
2229 mddev->sync_super(mddev, rdev);
2233 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2235 super_types[mddev->major_version].sync_super(mddev, rdev);
2238 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2240 struct md_rdev *rdev, *rdev2;
2243 rdev_for_each_rcu(rdev, mddev1) {
2244 if (test_bit(Faulty, &rdev->flags) ||
2245 test_bit(Journal, &rdev->flags) ||
2246 rdev->raid_disk == -1)
2248 rdev_for_each_rcu(rdev2, mddev2) {
2249 if (test_bit(Faulty, &rdev2->flags) ||
2250 test_bit(Journal, &rdev2->flags) ||
2251 rdev2->raid_disk == -1)
2253 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2263 static LIST_HEAD(pending_raid_disks);
2266 * Try to register data integrity profile for an mddev
2268 * This is called when an array is started and after a disk has been kicked
2269 * from the array. It only succeeds if all working and active component devices
2270 * are integrity capable with matching profiles.
2272 int md_integrity_register(struct mddev *mddev)
2274 struct md_rdev *rdev, *reference = NULL;
2276 if (list_empty(&mddev->disks))
2277 return 0; /* nothing to do */
2278 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2279 return 0; /* shouldn't register, or already is */
2280 rdev_for_each(rdev, mddev) {
2281 /* skip spares and non-functional disks */
2282 if (test_bit(Faulty, &rdev->flags))
2284 if (rdev->raid_disk < 0)
2287 /* Use the first rdev as the reference */
2291 /* does this rdev's profile match the reference profile? */
2292 if (blk_integrity_compare(reference->bdev->bd_disk,
2293 rdev->bdev->bd_disk) < 0)
2296 if (!reference || !bdev_get_integrity(reference->bdev))
2299 * All component devices are integrity capable and have matching
2300 * profiles, register the common profile for the md device.
2302 blk_integrity_register(mddev->gendisk,
2303 bdev_get_integrity(reference->bdev));
2305 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2306 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2307 (mddev->level != 1 && mddev->level != 10 &&
2308 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2310 * No need to handle the failure of bioset_integrity_create,
2311 * because the function is called by md_run() -> pers->run(),
2312 * md_run calls bioset_exit -> bioset_integrity_free in case
2315 pr_err("md: failed to create integrity pool for %s\n",
2321 EXPORT_SYMBOL(md_integrity_register);
2324 * Attempt to add an rdev, but only if it is consistent with the current
2327 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2329 struct blk_integrity *bi_mddev;
2331 if (!mddev->gendisk)
2334 bi_mddev = blk_get_integrity(mddev->gendisk);
2336 if (!bi_mddev) /* nothing to do */
2339 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2340 pr_err("%s: incompatible integrity profile for %pg\n",
2341 mdname(mddev), rdev->bdev);
2347 EXPORT_SYMBOL(md_integrity_add_rdev);
2349 static bool rdev_read_only(struct md_rdev *rdev)
2351 return bdev_read_only(rdev->bdev) ||
2352 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2355 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2357 char b[BDEVNAME_SIZE];
2360 /* prevent duplicates */
2361 if (find_rdev(mddev, rdev->bdev->bd_dev))
2364 if (rdev_read_only(rdev) && mddev->pers)
2367 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2368 if (!test_bit(Journal, &rdev->flags) &&
2370 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2372 /* Cannot change size, so fail
2373 * If mddev->level <= 0, then we don't care
2374 * about aligning sizes (e.g. linear)
2376 if (mddev->level > 0)
2379 mddev->dev_sectors = rdev->sectors;
2382 /* Verify rdev->desc_nr is unique.
2383 * If it is -1, assign a free number, else
2384 * check number is not in use
2387 if (rdev->desc_nr < 0) {
2390 choice = mddev->raid_disks;
2391 while (md_find_rdev_nr_rcu(mddev, choice))
2393 rdev->desc_nr = choice;
2395 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2401 if (!test_bit(Journal, &rdev->flags) &&
2402 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2403 pr_warn("md: %s: array is limited to %d devices\n",
2404 mdname(mddev), mddev->max_disks);
2407 snprintf(b, sizeof(b), "%pg", rdev->bdev);
2408 strreplace(b, '/', '!');
2410 rdev->mddev = mddev;
2411 pr_debug("md: bind<%s>\n", b);
2413 if (mddev->raid_disks)
2414 mddev_create_serial_pool(mddev, rdev, false);
2416 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2419 /* failure here is OK */
2420 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2421 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2422 rdev->sysfs_unack_badblocks =
2423 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2424 rdev->sysfs_badblocks =
2425 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2427 list_add_rcu(&rdev->same_set, &mddev->disks);
2428 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2430 /* May as well allow recovery to be retried once */
2431 mddev->recovery_disabled++;
2436 pr_warn("md: failed to register dev-%s for %s\n",
2441 void md_autodetect_dev(dev_t dev);
2443 /* just for claiming the bdev */
2444 static struct md_rdev claim_rdev;
2446 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
2448 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2449 md_rdev_clear(rdev);
2451 if (test_bit(AutoDetected, &rdev->flags))
2452 md_autodetect_dev(rdev->bdev->bd_dev);
2454 blkdev_put(rdev->bdev, mddev->external ? &claim_rdev : rdev);
2456 kobject_put(&rdev->kobj);
2459 static void md_kick_rdev_from_array(struct md_rdev *rdev)
2461 struct mddev *mddev = rdev->mddev;
2463 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2464 list_del_rcu(&rdev->same_set);
2465 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2466 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2468 sysfs_remove_link(&rdev->kobj, "block");
2469 sysfs_put(rdev->sysfs_state);
2470 sysfs_put(rdev->sysfs_unack_badblocks);
2471 sysfs_put(rdev->sysfs_badblocks);
2472 rdev->sysfs_state = NULL;
2473 rdev->sysfs_unack_badblocks = NULL;
2474 rdev->sysfs_badblocks = NULL;
2475 rdev->badblocks.count = 0;
2480 * kobject_del() will wait for all in progress writers to be done, where
2481 * reconfig_mutex is held, hence it can't be called under
2482 * reconfig_mutex and it's delayed to mddev_unlock().
2484 list_add(&rdev->same_set, &mddev->deleting);
2487 static void export_array(struct mddev *mddev)
2489 struct md_rdev *rdev;
2491 while (!list_empty(&mddev->disks)) {
2492 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2494 md_kick_rdev_from_array(rdev);
2496 mddev->raid_disks = 0;
2497 mddev->major_version = 0;
2500 static bool set_in_sync(struct mddev *mddev)
2502 lockdep_assert_held(&mddev->lock);
2503 if (!mddev->in_sync) {
2504 mddev->sync_checkers++;
2505 spin_unlock(&mddev->lock);
2506 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2507 spin_lock(&mddev->lock);
2508 if (!mddev->in_sync &&
2509 percpu_ref_is_zero(&mddev->writes_pending)) {
2512 * Ensure ->in_sync is visible before we clear
2516 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2517 sysfs_notify_dirent_safe(mddev->sysfs_state);
2519 if (--mddev->sync_checkers == 0)
2520 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2522 if (mddev->safemode == 1)
2523 mddev->safemode = 0;
2524 return mddev->in_sync;
2527 static void sync_sbs(struct mddev *mddev, int nospares)
2529 /* Update each superblock (in-memory image), but
2530 * if we are allowed to, skip spares which already
2531 * have the right event counter, or have one earlier
2532 * (which would mean they aren't being marked as dirty
2533 * with the rest of the array)
2535 struct md_rdev *rdev;
2536 rdev_for_each(rdev, mddev) {
2537 if (rdev->sb_events == mddev->events ||
2539 rdev->raid_disk < 0 &&
2540 rdev->sb_events+1 == mddev->events)) {
2541 /* Don't update this superblock */
2542 rdev->sb_loaded = 2;
2544 sync_super(mddev, rdev);
2545 rdev->sb_loaded = 1;
2550 static bool does_sb_need_changing(struct mddev *mddev)
2552 struct md_rdev *rdev = NULL, *iter;
2553 struct mdp_superblock_1 *sb;
2556 /* Find a good rdev */
2557 rdev_for_each(iter, mddev)
2558 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2563 /* No good device found. */
2567 sb = page_address(rdev->sb_page);
2568 /* Check if a device has become faulty or a spare become active */
2569 rdev_for_each(rdev, mddev) {
2570 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2571 /* Device activated? */
2572 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2573 !test_bit(Faulty, &rdev->flags))
2575 /* Device turned faulty? */
2576 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2580 /* Check if any mddev parameters have changed */
2581 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2582 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2583 (mddev->layout != le32_to_cpu(sb->layout)) ||
2584 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2585 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2591 void md_update_sb(struct mddev *mddev, int force_change)
2593 struct md_rdev *rdev;
2596 int any_badblocks_changed = 0;
2599 if (!md_is_rdwr(mddev)) {
2601 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2606 if (mddev_is_clustered(mddev)) {
2607 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2609 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2611 ret = md_cluster_ops->metadata_update_start(mddev);
2612 /* Has someone else has updated the sb */
2613 if (!does_sb_need_changing(mddev)) {
2615 md_cluster_ops->metadata_update_cancel(mddev);
2616 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2617 BIT(MD_SB_CHANGE_DEVS) |
2618 BIT(MD_SB_CHANGE_CLEAN));
2624 * First make sure individual recovery_offsets are correct
2625 * curr_resync_completed can only be used during recovery.
2626 * During reshape/resync it might use array-addresses rather
2627 * that device addresses.
2629 rdev_for_each(rdev, mddev) {
2630 if (rdev->raid_disk >= 0 &&
2631 mddev->delta_disks >= 0 &&
2632 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2633 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2634 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2635 !test_bit(Journal, &rdev->flags) &&
2636 !test_bit(In_sync, &rdev->flags) &&
2637 mddev->curr_resync_completed > rdev->recovery_offset)
2638 rdev->recovery_offset = mddev->curr_resync_completed;
2641 if (!mddev->persistent) {
2642 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2643 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2644 if (!mddev->external) {
2645 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2646 rdev_for_each(rdev, mddev) {
2647 if (rdev->badblocks.changed) {
2648 rdev->badblocks.changed = 0;
2649 ack_all_badblocks(&rdev->badblocks);
2650 md_error(mddev, rdev);
2652 clear_bit(Blocked, &rdev->flags);
2653 clear_bit(BlockedBadBlocks, &rdev->flags);
2654 wake_up(&rdev->blocked_wait);
2657 wake_up(&mddev->sb_wait);
2661 spin_lock(&mddev->lock);
2663 mddev->utime = ktime_get_real_seconds();
2665 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2667 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2668 /* just a clean<-> dirty transition, possibly leave spares alone,
2669 * though if events isn't the right even/odd, we will have to do
2675 if (mddev->degraded)
2676 /* If the array is degraded, then skipping spares is both
2677 * dangerous and fairly pointless.
2678 * Dangerous because a device that was removed from the array
2679 * might have a event_count that still looks up-to-date,
2680 * so it can be re-added without a resync.
2681 * Pointless because if there are any spares to skip,
2682 * then a recovery will happen and soon that array won't
2683 * be degraded any more and the spare can go back to sleep then.
2687 sync_req = mddev->in_sync;
2689 /* If this is just a dirty<->clean transition, and the array is clean
2690 * and 'events' is odd, we can roll back to the previous clean state */
2692 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2693 && mddev->can_decrease_events
2694 && mddev->events != 1) {
2696 mddev->can_decrease_events = 0;
2698 /* otherwise we have to go forward and ... */
2700 mddev->can_decrease_events = nospares;
2704 * This 64-bit counter should never wrap.
2705 * Either we are in around ~1 trillion A.C., assuming
2706 * 1 reboot per second, or we have a bug...
2708 WARN_ON(mddev->events == 0);
2710 rdev_for_each(rdev, mddev) {
2711 if (rdev->badblocks.changed)
2712 any_badblocks_changed++;
2713 if (test_bit(Faulty, &rdev->flags))
2714 set_bit(FaultRecorded, &rdev->flags);
2717 sync_sbs(mddev, nospares);
2718 spin_unlock(&mddev->lock);
2720 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2721 mdname(mddev), mddev->in_sync);
2724 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2726 md_bitmap_update_sb(mddev->bitmap);
2727 rdev_for_each(rdev, mddev) {
2728 if (rdev->sb_loaded != 1)
2729 continue; /* no noise on spare devices */
2731 if (!test_bit(Faulty, &rdev->flags)) {
2732 md_super_write(mddev,rdev,
2733 rdev->sb_start, rdev->sb_size,
2735 pr_debug("md: (write) %pg's sb offset: %llu\n",
2737 (unsigned long long)rdev->sb_start);
2738 rdev->sb_events = mddev->events;
2739 if (rdev->badblocks.size) {
2740 md_super_write(mddev, rdev,
2741 rdev->badblocks.sector,
2742 rdev->badblocks.size << 9,
2744 rdev->badblocks.size = 0;
2748 pr_debug("md: %pg (skipping faulty)\n",
2751 if (mddev->level == LEVEL_MULTIPATH)
2752 /* only need to write one superblock... */
2755 if (md_super_wait(mddev) < 0)
2757 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2759 if (mddev_is_clustered(mddev) && ret == 0)
2760 md_cluster_ops->metadata_update_finish(mddev);
2762 if (mddev->in_sync != sync_req ||
2763 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2764 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2765 /* have to write it out again */
2767 wake_up(&mddev->sb_wait);
2768 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2769 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2771 rdev_for_each(rdev, mddev) {
2772 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2773 clear_bit(Blocked, &rdev->flags);
2775 if (any_badblocks_changed)
2776 ack_all_badblocks(&rdev->badblocks);
2777 clear_bit(BlockedBadBlocks, &rdev->flags);
2778 wake_up(&rdev->blocked_wait);
2781 EXPORT_SYMBOL(md_update_sb);
2783 static int add_bound_rdev(struct md_rdev *rdev)
2785 struct mddev *mddev = rdev->mddev;
2787 bool add_journal = test_bit(Journal, &rdev->flags);
2789 if (!mddev->pers->hot_remove_disk || add_journal) {
2790 /* If there is hot_add_disk but no hot_remove_disk
2791 * then added disks for geometry changes,
2792 * and should be added immediately.
2794 super_types[mddev->major_version].
2795 validate_super(mddev, rdev);
2797 mddev_suspend(mddev);
2798 err = mddev->pers->hot_add_disk(mddev, rdev);
2800 mddev_resume(mddev);
2802 md_kick_rdev_from_array(rdev);
2806 sysfs_notify_dirent_safe(rdev->sysfs_state);
2808 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2809 if (mddev->degraded)
2810 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2811 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2813 md_wakeup_thread(mddev->thread);
2817 /* words written to sysfs files may, or may not, be \n terminated.
2818 * We want to accept with case. For this we use cmd_match.
2820 static int cmd_match(const char *cmd, const char *str)
2822 /* See if cmd, written into a sysfs file, matches
2823 * str. They must either be the same, or cmd can
2824 * have a trailing newline
2826 while (*cmd && *str && *cmd == *str) {
2837 struct rdev_sysfs_entry {
2838 struct attribute attr;
2839 ssize_t (*show)(struct md_rdev *, char *);
2840 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2844 state_show(struct md_rdev *rdev, char *page)
2848 unsigned long flags = READ_ONCE(rdev->flags);
2850 if (test_bit(Faulty, &flags) ||
2851 (!test_bit(ExternalBbl, &flags) &&
2852 rdev->badblocks.unacked_exist))
2853 len += sprintf(page+len, "faulty%s", sep);
2854 if (test_bit(In_sync, &flags))
2855 len += sprintf(page+len, "in_sync%s", sep);
2856 if (test_bit(Journal, &flags))
2857 len += sprintf(page+len, "journal%s", sep);
2858 if (test_bit(WriteMostly, &flags))
2859 len += sprintf(page+len, "write_mostly%s", sep);
2860 if (test_bit(Blocked, &flags) ||
2861 (rdev->badblocks.unacked_exist
2862 && !test_bit(Faulty, &flags)))
2863 len += sprintf(page+len, "blocked%s", sep);
2864 if (!test_bit(Faulty, &flags) &&
2865 !test_bit(Journal, &flags) &&
2866 !test_bit(In_sync, &flags))
2867 len += sprintf(page+len, "spare%s", sep);
2868 if (test_bit(WriteErrorSeen, &flags))
2869 len += sprintf(page+len, "write_error%s", sep);
2870 if (test_bit(WantReplacement, &flags))
2871 len += sprintf(page+len, "want_replacement%s", sep);
2872 if (test_bit(Replacement, &flags))
2873 len += sprintf(page+len, "replacement%s", sep);
2874 if (test_bit(ExternalBbl, &flags))
2875 len += sprintf(page+len, "external_bbl%s", sep);
2876 if (test_bit(FailFast, &flags))
2877 len += sprintf(page+len, "failfast%s", sep);
2882 return len+sprintf(page+len, "\n");
2886 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2889 * faulty - simulates an error
2890 * remove - disconnects the device
2891 * writemostly - sets write_mostly
2892 * -writemostly - clears write_mostly
2893 * blocked - sets the Blocked flags
2894 * -blocked - clears the Blocked and possibly simulates an error
2895 * insync - sets Insync providing device isn't active
2896 * -insync - clear Insync for a device with a slot assigned,
2897 * so that it gets rebuilt based on bitmap
2898 * write_error - sets WriteErrorSeen
2899 * -write_error - clears WriteErrorSeen
2900 * {,-}failfast - set/clear FailFast
2903 struct mddev *mddev = rdev->mddev;
2905 bool need_update_sb = false;
2907 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2908 md_error(rdev->mddev, rdev);
2910 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
2914 } else if (cmd_match(buf, "remove")) {
2915 if (rdev->mddev->pers) {
2916 clear_bit(Blocked, &rdev->flags);
2917 remove_and_add_spares(rdev->mddev, rdev);
2919 if (rdev->raid_disk >= 0)
2923 if (mddev_is_clustered(mddev))
2924 err = md_cluster_ops->remove_disk(mddev, rdev);
2927 md_kick_rdev_from_array(rdev);
2929 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2930 md_wakeup_thread(mddev->thread);
2935 } else if (cmd_match(buf, "writemostly")) {
2936 set_bit(WriteMostly, &rdev->flags);
2937 mddev_create_serial_pool(rdev->mddev, rdev, false);
2938 need_update_sb = true;
2940 } else if (cmd_match(buf, "-writemostly")) {
2941 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2942 clear_bit(WriteMostly, &rdev->flags);
2943 need_update_sb = true;
2945 } else if (cmd_match(buf, "blocked")) {
2946 set_bit(Blocked, &rdev->flags);
2948 } else if (cmd_match(buf, "-blocked")) {
2949 if (!test_bit(Faulty, &rdev->flags) &&
2950 !test_bit(ExternalBbl, &rdev->flags) &&
2951 rdev->badblocks.unacked_exist) {
2952 /* metadata handler doesn't understand badblocks,
2953 * so we need to fail the device
2955 md_error(rdev->mddev, rdev);
2957 clear_bit(Blocked, &rdev->flags);
2958 clear_bit(BlockedBadBlocks, &rdev->flags);
2959 wake_up(&rdev->blocked_wait);
2960 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2961 md_wakeup_thread(rdev->mddev->thread);
2964 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2965 set_bit(In_sync, &rdev->flags);
2967 } else if (cmd_match(buf, "failfast")) {
2968 set_bit(FailFast, &rdev->flags);
2969 need_update_sb = true;
2971 } else if (cmd_match(buf, "-failfast")) {
2972 clear_bit(FailFast, &rdev->flags);
2973 need_update_sb = true;
2975 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2976 !test_bit(Journal, &rdev->flags)) {
2977 if (rdev->mddev->pers == NULL) {
2978 clear_bit(In_sync, &rdev->flags);
2979 rdev->saved_raid_disk = rdev->raid_disk;
2980 rdev->raid_disk = -1;
2983 } else if (cmd_match(buf, "write_error")) {
2984 set_bit(WriteErrorSeen, &rdev->flags);
2986 } else if (cmd_match(buf, "-write_error")) {
2987 clear_bit(WriteErrorSeen, &rdev->flags);
2989 } else if (cmd_match(buf, "want_replacement")) {
2990 /* Any non-spare device that is not a replacement can
2991 * become want_replacement at any time, but we then need to
2992 * check if recovery is needed.
2994 if (rdev->raid_disk >= 0 &&
2995 !test_bit(Journal, &rdev->flags) &&
2996 !test_bit(Replacement, &rdev->flags))
2997 set_bit(WantReplacement, &rdev->flags);
2998 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2999 md_wakeup_thread(rdev->mddev->thread);
3001 } else if (cmd_match(buf, "-want_replacement")) {
3002 /* Clearing 'want_replacement' is always allowed.
3003 * Once replacements starts it is too late though.
3006 clear_bit(WantReplacement, &rdev->flags);
3007 } else if (cmd_match(buf, "replacement")) {
3008 /* Can only set a device as a replacement when array has not
3009 * yet been started. Once running, replacement is automatic
3010 * from spares, or by assigning 'slot'.
3012 if (rdev->mddev->pers)
3015 set_bit(Replacement, &rdev->flags);
3018 } else if (cmd_match(buf, "-replacement")) {
3019 /* Similarly, can only clear Replacement before start */
3020 if (rdev->mddev->pers)
3023 clear_bit(Replacement, &rdev->flags);
3026 } else if (cmd_match(buf, "re-add")) {
3027 if (!rdev->mddev->pers)
3029 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3030 rdev->saved_raid_disk >= 0) {
3031 /* clear_bit is performed _after_ all the devices
3032 * have their local Faulty bit cleared. If any writes
3033 * happen in the meantime in the local node, they
3034 * will land in the local bitmap, which will be synced
3035 * by this node eventually
3037 if (!mddev_is_clustered(rdev->mddev) ||
3038 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3039 clear_bit(Faulty, &rdev->flags);
3040 err = add_bound_rdev(rdev);
3044 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3045 set_bit(ExternalBbl, &rdev->flags);
3046 rdev->badblocks.shift = 0;
3048 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3049 clear_bit(ExternalBbl, &rdev->flags);
3053 md_update_sb(mddev, 1);
3055 sysfs_notify_dirent_safe(rdev->sysfs_state);
3056 return err ? err : len;
3058 static struct rdev_sysfs_entry rdev_state =
3059 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3062 errors_show(struct md_rdev *rdev, char *page)
3064 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3068 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3073 rv = kstrtouint(buf, 10, &n);
3076 atomic_set(&rdev->corrected_errors, n);
3079 static struct rdev_sysfs_entry rdev_errors =
3080 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3083 slot_show(struct md_rdev *rdev, char *page)
3085 if (test_bit(Journal, &rdev->flags))
3086 return sprintf(page, "journal\n");
3087 else if (rdev->raid_disk < 0)
3088 return sprintf(page, "none\n");
3090 return sprintf(page, "%d\n", rdev->raid_disk);
3094 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3099 if (test_bit(Journal, &rdev->flags))
3101 if (strncmp(buf, "none", 4)==0)
3104 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3111 if (rdev->mddev->pers && slot == -1) {
3112 /* Setting 'slot' on an active array requires also
3113 * updating the 'rd%d' link, and communicating
3114 * with the personality with ->hot_*_disk.
3115 * For now we only support removing
3116 * failed/spare devices. This normally happens automatically,
3117 * but not when the metadata is externally managed.
3119 if (rdev->raid_disk == -1)
3121 /* personality does all needed checks */
3122 if (rdev->mddev->pers->hot_remove_disk == NULL)
3124 clear_bit(Blocked, &rdev->flags);
3125 remove_and_add_spares(rdev->mddev, rdev);
3126 if (rdev->raid_disk >= 0)
3128 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3129 md_wakeup_thread(rdev->mddev->thread);
3130 } else if (rdev->mddev->pers) {
3131 /* Activating a spare .. or possibly reactivating
3132 * if we ever get bitmaps working here.
3136 if (rdev->raid_disk != -1)
3139 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3142 if (rdev->mddev->pers->hot_add_disk == NULL)
3145 if (slot >= rdev->mddev->raid_disks &&
3146 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3149 rdev->raid_disk = slot;
3150 if (test_bit(In_sync, &rdev->flags))
3151 rdev->saved_raid_disk = slot;
3153 rdev->saved_raid_disk = -1;
3154 clear_bit(In_sync, &rdev->flags);
3155 clear_bit(Bitmap_sync, &rdev->flags);
3156 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3158 rdev->raid_disk = -1;
3161 sysfs_notify_dirent_safe(rdev->sysfs_state);
3162 /* failure here is OK */;
3163 sysfs_link_rdev(rdev->mddev, rdev);
3164 /* don't wakeup anyone, leave that to userspace. */
3166 if (slot >= rdev->mddev->raid_disks &&
3167 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3169 rdev->raid_disk = slot;
3170 /* assume it is working */
3171 clear_bit(Faulty, &rdev->flags);
3172 clear_bit(WriteMostly, &rdev->flags);
3173 set_bit(In_sync, &rdev->flags);
3174 sysfs_notify_dirent_safe(rdev->sysfs_state);
3179 static struct rdev_sysfs_entry rdev_slot =
3180 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3183 offset_show(struct md_rdev *rdev, char *page)
3185 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3189 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3191 unsigned long long offset;
3192 if (kstrtoull(buf, 10, &offset) < 0)
3194 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3196 if (rdev->sectors && rdev->mddev->external)
3197 /* Must set offset before size, so overlap checks
3200 rdev->data_offset = offset;
3201 rdev->new_data_offset = offset;
3205 static struct rdev_sysfs_entry rdev_offset =
3206 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3208 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3210 return sprintf(page, "%llu\n",
3211 (unsigned long long)rdev->new_data_offset);
3214 static ssize_t new_offset_store(struct md_rdev *rdev,
3215 const char *buf, size_t len)
3217 unsigned long long new_offset;
3218 struct mddev *mddev = rdev->mddev;
3220 if (kstrtoull(buf, 10, &new_offset) < 0)
3223 if (mddev->sync_thread ||
3224 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3226 if (new_offset == rdev->data_offset)
3227 /* reset is always permitted */
3229 else if (new_offset > rdev->data_offset) {
3230 /* must not push array size beyond rdev_sectors */
3231 if (new_offset - rdev->data_offset
3232 + mddev->dev_sectors > rdev->sectors)
3235 /* Metadata worries about other space details. */
3237 /* decreasing the offset is inconsistent with a backwards
3240 if (new_offset < rdev->data_offset &&
3241 mddev->reshape_backwards)
3243 /* Increasing offset is inconsistent with forwards
3244 * reshape. reshape_direction should be set to
3245 * 'backwards' first.
3247 if (new_offset > rdev->data_offset &&
3248 !mddev->reshape_backwards)
3251 if (mddev->pers && mddev->persistent &&
3252 !super_types[mddev->major_version]
3253 .allow_new_offset(rdev, new_offset))
3255 rdev->new_data_offset = new_offset;
3256 if (new_offset > rdev->data_offset)
3257 mddev->reshape_backwards = 1;
3258 else if (new_offset < rdev->data_offset)
3259 mddev->reshape_backwards = 0;
3263 static struct rdev_sysfs_entry rdev_new_offset =
3264 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3267 rdev_size_show(struct md_rdev *rdev, char *page)
3269 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3272 static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
3274 /* check if two start/length pairs overlap */
3275 if (a->data_offset + a->sectors <= b->data_offset)
3277 if (b->data_offset + b->sectors <= a->data_offset)
3282 static bool md_rdev_overlaps(struct md_rdev *rdev)
3284 struct mddev *mddev;
3285 struct md_rdev *rdev2;
3287 spin_lock(&all_mddevs_lock);
3288 list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
3289 if (test_bit(MD_DELETED, &mddev->flags))
3291 rdev_for_each(rdev2, mddev) {
3292 if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
3293 md_rdevs_overlap(rdev, rdev2)) {
3294 spin_unlock(&all_mddevs_lock);
3299 spin_unlock(&all_mddevs_lock);
3303 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3305 unsigned long long blocks;
3308 if (kstrtoull(buf, 10, &blocks) < 0)
3311 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3312 return -EINVAL; /* sector conversion overflow */
3315 if (new != blocks * 2)
3316 return -EINVAL; /* unsigned long long to sector_t overflow */
3323 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3325 struct mddev *my_mddev = rdev->mddev;
3326 sector_t oldsectors = rdev->sectors;
3329 if (test_bit(Journal, &rdev->flags))
3331 if (strict_blocks_to_sectors(buf, §ors) < 0)
3333 if (rdev->data_offset != rdev->new_data_offset)
3334 return -EINVAL; /* too confusing */
3335 if (my_mddev->pers && rdev->raid_disk >= 0) {
3336 if (my_mddev->persistent) {
3337 sectors = super_types[my_mddev->major_version].
3338 rdev_size_change(rdev, sectors);
3341 } else if (!sectors)
3342 sectors = bdev_nr_sectors(rdev->bdev) -
3344 if (!my_mddev->pers->resize)
3345 /* Cannot change size for RAID0 or Linear etc */
3348 if (sectors < my_mddev->dev_sectors)
3349 return -EINVAL; /* component must fit device */
3351 rdev->sectors = sectors;
3354 * Check that all other rdevs with the same bdev do not overlap. This
3355 * check does not provide a hard guarantee, it just helps avoid
3356 * dangerous mistakes.
3358 if (sectors > oldsectors && my_mddev->external &&
3359 md_rdev_overlaps(rdev)) {
3361 * Someone else could have slipped in a size change here, but
3362 * doing so is just silly. We put oldsectors back because we
3363 * know it is safe, and trust userspace not to race with itself.
3365 rdev->sectors = oldsectors;
3371 static struct rdev_sysfs_entry rdev_size =
3372 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3374 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3376 unsigned long long recovery_start = rdev->recovery_offset;
3378 if (test_bit(In_sync, &rdev->flags) ||
3379 recovery_start == MaxSector)
3380 return sprintf(page, "none\n");
3382 return sprintf(page, "%llu\n", recovery_start);
3385 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3387 unsigned long long recovery_start;
3389 if (cmd_match(buf, "none"))
3390 recovery_start = MaxSector;
3391 else if (kstrtoull(buf, 10, &recovery_start))
3394 if (rdev->mddev->pers &&
3395 rdev->raid_disk >= 0)
3398 rdev->recovery_offset = recovery_start;
3399 if (recovery_start == MaxSector)
3400 set_bit(In_sync, &rdev->flags);
3402 clear_bit(In_sync, &rdev->flags);
3406 static struct rdev_sysfs_entry rdev_recovery_start =
3407 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3409 /* sysfs access to bad-blocks list.
3410 * We present two files.
3411 * 'bad-blocks' lists sector numbers and lengths of ranges that
3412 * are recorded as bad. The list is truncated to fit within
3413 * the one-page limit of sysfs.
3414 * Writing "sector length" to this file adds an acknowledged
3416 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3417 * been acknowledged. Writing to this file adds bad blocks
3418 * without acknowledging them. This is largely for testing.
3420 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3422 return badblocks_show(&rdev->badblocks, page, 0);
3424 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3426 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3427 /* Maybe that ack was all we needed */
3428 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3429 wake_up(&rdev->blocked_wait);
3432 static struct rdev_sysfs_entry rdev_bad_blocks =
3433 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3435 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3437 return badblocks_show(&rdev->badblocks, page, 1);
3439 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3441 return badblocks_store(&rdev->badblocks, page, len, 1);
3443 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3444 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3447 ppl_sector_show(struct md_rdev *rdev, char *page)
3449 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3453 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3455 unsigned long long sector;
3457 if (kstrtoull(buf, 10, §or) < 0)
3459 if (sector != (sector_t)sector)
3462 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3463 rdev->raid_disk >= 0)
3466 if (rdev->mddev->persistent) {
3467 if (rdev->mddev->major_version == 0)
3469 if ((sector > rdev->sb_start &&
3470 sector - rdev->sb_start > S16_MAX) ||
3471 (sector < rdev->sb_start &&
3472 rdev->sb_start - sector > -S16_MIN))
3474 rdev->ppl.offset = sector - rdev->sb_start;
3475 } else if (!rdev->mddev->external) {
3478 rdev->ppl.sector = sector;
3482 static struct rdev_sysfs_entry rdev_ppl_sector =
3483 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3486 ppl_size_show(struct md_rdev *rdev, char *page)
3488 return sprintf(page, "%u\n", rdev->ppl.size);
3492 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3496 if (kstrtouint(buf, 10, &size) < 0)
3499 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3500 rdev->raid_disk >= 0)
3503 if (rdev->mddev->persistent) {
3504 if (rdev->mddev->major_version == 0)
3508 } else if (!rdev->mddev->external) {
3511 rdev->ppl.size = size;
3515 static struct rdev_sysfs_entry rdev_ppl_size =
3516 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3518 static struct attribute *rdev_default_attrs[] = {
3523 &rdev_new_offset.attr,
3525 &rdev_recovery_start.attr,
3526 &rdev_bad_blocks.attr,
3527 &rdev_unack_bad_blocks.attr,
3528 &rdev_ppl_sector.attr,
3529 &rdev_ppl_size.attr,
3532 ATTRIBUTE_GROUPS(rdev_default);
3534 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3536 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3537 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3543 return entry->show(rdev, page);
3547 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3548 const char *page, size_t length)
3550 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3551 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3552 struct kernfs_node *kn = NULL;
3554 struct mddev *mddev = rdev->mddev;
3558 if (!capable(CAP_SYS_ADMIN))
3561 if (entry->store == state_store && cmd_match(page, "remove"))
3562 kn = sysfs_break_active_protection(kobj, attr);
3564 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3566 if (rdev->mddev == NULL)
3569 rv = entry->store(rdev, page, length);
3570 mddev_unlock(mddev);
3574 sysfs_unbreak_active_protection(kn);
3579 static void rdev_free(struct kobject *ko)
3581 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3584 static const struct sysfs_ops rdev_sysfs_ops = {
3585 .show = rdev_attr_show,
3586 .store = rdev_attr_store,
3588 static const struct kobj_type rdev_ktype = {
3589 .release = rdev_free,
3590 .sysfs_ops = &rdev_sysfs_ops,
3591 .default_groups = rdev_default_groups,
3594 int md_rdev_init(struct md_rdev *rdev)
3597 rdev->saved_raid_disk = -1;
3598 rdev->raid_disk = -1;
3600 rdev->data_offset = 0;
3601 rdev->new_data_offset = 0;
3602 rdev->sb_events = 0;
3603 rdev->last_read_error = 0;
3604 rdev->sb_loaded = 0;
3605 rdev->bb_page = NULL;
3606 atomic_set(&rdev->nr_pending, 0);
3607 atomic_set(&rdev->read_errors, 0);
3608 atomic_set(&rdev->corrected_errors, 0);
3610 INIT_LIST_HEAD(&rdev->same_set);
3611 init_waitqueue_head(&rdev->blocked_wait);
3613 /* Add space to store bad block list.
3614 * This reserves the space even on arrays where it cannot
3615 * be used - I wonder if that matters
3617 return badblocks_init(&rdev->badblocks, 0);
3619 EXPORT_SYMBOL_GPL(md_rdev_init);
3622 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3624 * mark the device faulty if:
3626 * - the device is nonexistent (zero size)
3627 * - the device has no valid superblock
3629 * a faulty rdev _never_ has rdev->sb set.
3631 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3633 struct md_rdev *rdev;
3637 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3639 return ERR_PTR(-ENOMEM);
3641 err = md_rdev_init(rdev);
3644 err = alloc_disk_sb(rdev);
3646 goto out_clear_rdev;
3648 rdev->bdev = blkdev_get_by_dev(newdev, BLK_OPEN_READ | BLK_OPEN_WRITE,
3649 super_format == -2 ? &claim_rdev : rdev, NULL);
3650 if (IS_ERR(rdev->bdev)) {
3651 pr_warn("md: could not open device unknown-block(%u,%u).\n",
3652 MAJOR(newdev), MINOR(newdev));
3653 err = PTR_ERR(rdev->bdev);
3654 goto out_clear_rdev;
3657 kobject_init(&rdev->kobj, &rdev_ktype);
3659 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3661 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3664 goto out_blkdev_put;
3667 if (super_format >= 0) {
3668 err = super_types[super_format].
3669 load_super(rdev, NULL, super_minor);
3670 if (err == -EINVAL) {
3671 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3673 super_format, super_minor);
3674 goto out_blkdev_put;
3677 pr_warn("md: could not read %pg's sb, not importing!\n",
3679 goto out_blkdev_put;
3686 blkdev_put(rdev->bdev, super_format == -2 ? &claim_rdev : rdev);
3688 md_rdev_clear(rdev);
3691 return ERR_PTR(err);
3695 * Check a full RAID array for plausibility
3698 static int analyze_sbs(struct mddev *mddev)
3701 struct md_rdev *rdev, *freshest, *tmp;
3704 rdev_for_each_safe(rdev, tmp, mddev)
3705 switch (super_types[mddev->major_version].
3706 load_super(rdev, freshest, mddev->minor_version)) {
3713 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3715 md_kick_rdev_from_array(rdev);
3718 /* Cannot find a valid fresh disk */
3720 pr_warn("md: cannot find a valid disk\n");
3724 super_types[mddev->major_version].
3725 validate_super(mddev, freshest);
3728 rdev_for_each_safe(rdev, tmp, mddev) {
3729 if (mddev->max_disks &&
3730 (rdev->desc_nr >= mddev->max_disks ||
3731 i > mddev->max_disks)) {
3732 pr_warn("md: %s: %pg: only %d devices permitted\n",
3733 mdname(mddev), rdev->bdev,
3735 md_kick_rdev_from_array(rdev);
3738 if (rdev != freshest) {
3739 if (super_types[mddev->major_version].
3740 validate_super(mddev, rdev)) {
3741 pr_warn("md: kicking non-fresh %pg from array!\n",
3743 md_kick_rdev_from_array(rdev);
3747 if (mddev->level == LEVEL_MULTIPATH) {
3748 rdev->desc_nr = i++;
3749 rdev->raid_disk = rdev->desc_nr;
3750 set_bit(In_sync, &rdev->flags);
3751 } else if (rdev->raid_disk >=
3752 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3753 !test_bit(Journal, &rdev->flags)) {
3754 rdev->raid_disk = -1;
3755 clear_bit(In_sync, &rdev->flags);
3762 /* Read a fixed-point number.
3763 * Numbers in sysfs attributes should be in "standard" units where
3764 * possible, so time should be in seconds.
3765 * However we internally use a a much smaller unit such as
3766 * milliseconds or jiffies.
3767 * This function takes a decimal number with a possible fractional
3768 * component, and produces an integer which is the result of
3769 * multiplying that number by 10^'scale'.
3770 * all without any floating-point arithmetic.
3772 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3774 unsigned long result = 0;
3776 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3779 else if (decimals < scale) {
3782 result = result * 10 + value;
3794 *res = result * int_pow(10, scale - decimals);
3799 safe_delay_show(struct mddev *mddev, char *page)
3801 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3803 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3806 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3810 if (mddev_is_clustered(mddev)) {
3811 pr_warn("md: Safemode is disabled for clustered mode\n");
3815 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3818 mddev->safemode_delay = 0;
3820 unsigned long old_delay = mddev->safemode_delay;
3821 unsigned long new_delay = (msec*HZ)/1000;
3825 mddev->safemode_delay = new_delay;
3826 if (new_delay < old_delay || old_delay == 0)
3827 mod_timer(&mddev->safemode_timer, jiffies+1);
3831 static struct md_sysfs_entry md_safe_delay =
3832 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3835 level_show(struct mddev *mddev, char *page)
3837 struct md_personality *p;
3839 spin_lock(&mddev->lock);
3842 ret = sprintf(page, "%s\n", p->name);
3843 else if (mddev->clevel[0])
3844 ret = sprintf(page, "%s\n", mddev->clevel);
3845 else if (mddev->level != LEVEL_NONE)
3846 ret = sprintf(page, "%d\n", mddev->level);
3849 spin_unlock(&mddev->lock);
3854 level_store(struct mddev *mddev, const char *buf, size_t len)
3859 struct md_personality *pers, *oldpers;
3861 void *priv, *oldpriv;
3862 struct md_rdev *rdev;
3864 if (slen == 0 || slen >= sizeof(clevel))
3867 rv = mddev_lock(mddev);
3871 if (mddev->pers == NULL) {
3872 strncpy(mddev->clevel, buf, slen);
3873 if (mddev->clevel[slen-1] == '\n')
3875 mddev->clevel[slen] = 0;
3876 mddev->level = LEVEL_NONE;
3881 if (!md_is_rdwr(mddev))
3884 /* request to change the personality. Need to ensure:
3885 * - array is not engaged in resync/recovery/reshape
3886 * - old personality can be suspended
3887 * - new personality will access other array.
3891 if (mddev->sync_thread ||
3892 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3893 mddev->reshape_position != MaxSector ||
3894 mddev->sysfs_active)
3898 if (!mddev->pers->quiesce) {
3899 pr_warn("md: %s: %s does not support online personality change\n",
3900 mdname(mddev), mddev->pers->name);
3904 /* Now find the new personality */
3905 strncpy(clevel, buf, slen);
3906 if (clevel[slen-1] == '\n')
3909 if (kstrtol(clevel, 10, &level))
3912 if (request_module("md-%s", clevel) != 0)
3913 request_module("md-level-%s", clevel);
3914 spin_lock(&pers_lock);
3915 pers = find_pers(level, clevel);
3916 if (!pers || !try_module_get(pers->owner)) {
3917 spin_unlock(&pers_lock);
3918 pr_warn("md: personality %s not loaded\n", clevel);
3922 spin_unlock(&pers_lock);
3924 if (pers == mddev->pers) {
3925 /* Nothing to do! */
3926 module_put(pers->owner);
3930 if (!pers->takeover) {
3931 module_put(pers->owner);
3932 pr_warn("md: %s: %s does not support personality takeover\n",
3933 mdname(mddev), clevel);
3938 rdev_for_each(rdev, mddev)
3939 rdev->new_raid_disk = rdev->raid_disk;
3941 /* ->takeover must set new_* and/or delta_disks
3942 * if it succeeds, and may set them when it fails.
3944 priv = pers->takeover(mddev);
3946 mddev->new_level = mddev->level;
3947 mddev->new_layout = mddev->layout;
3948 mddev->new_chunk_sectors = mddev->chunk_sectors;
3949 mddev->raid_disks -= mddev->delta_disks;
3950 mddev->delta_disks = 0;
3951 mddev->reshape_backwards = 0;
3952 module_put(pers->owner);
3953 pr_warn("md: %s: %s would not accept array\n",
3954 mdname(mddev), clevel);
3959 /* Looks like we have a winner */
3960 mddev_suspend(mddev);
3961 mddev_detach(mddev);
3963 spin_lock(&mddev->lock);
3964 oldpers = mddev->pers;
3965 oldpriv = mddev->private;
3967 mddev->private = priv;
3968 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3969 mddev->level = mddev->new_level;
3970 mddev->layout = mddev->new_layout;
3971 mddev->chunk_sectors = mddev->new_chunk_sectors;
3972 mddev->delta_disks = 0;
3973 mddev->reshape_backwards = 0;
3974 mddev->degraded = 0;
3975 spin_unlock(&mddev->lock);
3977 if (oldpers->sync_request == NULL &&
3979 /* We are converting from a no-redundancy array
3980 * to a redundancy array and metadata is managed
3981 * externally so we need to be sure that writes
3982 * won't block due to a need to transition
3984 * until external management is started.
3987 mddev->safemode_delay = 0;
3988 mddev->safemode = 0;
3991 oldpers->free(mddev, oldpriv);
3993 if (oldpers->sync_request == NULL &&
3994 pers->sync_request != NULL) {
3995 /* need to add the md_redundancy_group */
3996 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3997 pr_warn("md: cannot register extra attributes for %s\n",
3999 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4000 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4001 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4003 if (oldpers->sync_request != NULL &&
4004 pers->sync_request == NULL) {
4005 /* need to remove the md_redundancy_group */
4006 if (mddev->to_remove == NULL)
4007 mddev->to_remove = &md_redundancy_group;
4010 module_put(oldpers->owner);
4012 rdev_for_each(rdev, mddev) {
4013 if (rdev->raid_disk < 0)
4015 if (rdev->new_raid_disk >= mddev->raid_disks)
4016 rdev->new_raid_disk = -1;
4017 if (rdev->new_raid_disk == rdev->raid_disk)
4019 sysfs_unlink_rdev(mddev, rdev);
4021 rdev_for_each(rdev, mddev) {
4022 if (rdev->raid_disk < 0)
4024 if (rdev->new_raid_disk == rdev->raid_disk)
4026 rdev->raid_disk = rdev->new_raid_disk;
4027 if (rdev->raid_disk < 0)
4028 clear_bit(In_sync, &rdev->flags);
4030 if (sysfs_link_rdev(mddev, rdev))
4031 pr_warn("md: cannot register rd%d for %s after level change\n",
4032 rdev->raid_disk, mdname(mddev));
4036 if (pers->sync_request == NULL) {
4037 /* this is now an array without redundancy, so
4038 * it must always be in_sync
4041 del_timer_sync(&mddev->safemode_timer);
4043 blk_set_stacking_limits(&mddev->queue->limits);
4045 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4046 mddev_resume(mddev);
4048 md_update_sb(mddev, 1);
4049 sysfs_notify_dirent_safe(mddev->sysfs_level);
4053 mddev_unlock(mddev);
4057 static struct md_sysfs_entry md_level =
4058 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4061 layout_show(struct mddev *mddev, char *page)
4063 /* just a number, not meaningful for all levels */
4064 if (mddev->reshape_position != MaxSector &&
4065 mddev->layout != mddev->new_layout)
4066 return sprintf(page, "%d (%d)\n",
4067 mddev->new_layout, mddev->layout);
4068 return sprintf(page, "%d\n", mddev->layout);
4072 layout_store(struct mddev *mddev, const char *buf, size_t len)
4077 err = kstrtouint(buf, 10, &n);
4080 err = mddev_lock(mddev);
4085 if (mddev->pers->check_reshape == NULL)
4087 else if (!md_is_rdwr(mddev))
4090 mddev->new_layout = n;
4091 err = mddev->pers->check_reshape(mddev);
4093 mddev->new_layout = mddev->layout;
4096 mddev->new_layout = n;
4097 if (mddev->reshape_position == MaxSector)
4100 mddev_unlock(mddev);
4103 static struct md_sysfs_entry md_layout =
4104 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4107 raid_disks_show(struct mddev *mddev, char *page)
4109 if (mddev->raid_disks == 0)
4111 if (mddev->reshape_position != MaxSector &&
4112 mddev->delta_disks != 0)
4113 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4114 mddev->raid_disks - mddev->delta_disks);
4115 return sprintf(page, "%d\n", mddev->raid_disks);
4118 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4121 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4126 err = kstrtouint(buf, 10, &n);
4130 err = mddev_lock(mddev);
4134 err = update_raid_disks(mddev, n);
4135 else if (mddev->reshape_position != MaxSector) {
4136 struct md_rdev *rdev;
4137 int olddisks = mddev->raid_disks - mddev->delta_disks;
4140 rdev_for_each(rdev, mddev) {
4142 rdev->data_offset < rdev->new_data_offset)
4145 rdev->data_offset > rdev->new_data_offset)
4149 mddev->delta_disks = n - olddisks;
4150 mddev->raid_disks = n;
4151 mddev->reshape_backwards = (mddev->delta_disks < 0);
4153 mddev->raid_disks = n;
4155 mddev_unlock(mddev);
4156 return err ? err : len;
4158 static struct md_sysfs_entry md_raid_disks =
4159 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4162 uuid_show(struct mddev *mddev, char *page)
4164 return sprintf(page, "%pU\n", mddev->uuid);
4166 static struct md_sysfs_entry md_uuid =
4167 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4170 chunk_size_show(struct mddev *mddev, char *page)
4172 if (mddev->reshape_position != MaxSector &&
4173 mddev->chunk_sectors != mddev->new_chunk_sectors)
4174 return sprintf(page, "%d (%d)\n",
4175 mddev->new_chunk_sectors << 9,
4176 mddev->chunk_sectors << 9);
4177 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4181 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4186 err = kstrtoul(buf, 10, &n);
4190 err = mddev_lock(mddev);
4194 if (mddev->pers->check_reshape == NULL)
4196 else if (!md_is_rdwr(mddev))
4199 mddev->new_chunk_sectors = n >> 9;
4200 err = mddev->pers->check_reshape(mddev);
4202 mddev->new_chunk_sectors = mddev->chunk_sectors;
4205 mddev->new_chunk_sectors = n >> 9;
4206 if (mddev->reshape_position == MaxSector)
4207 mddev->chunk_sectors = n >> 9;
4209 mddev_unlock(mddev);
4212 static struct md_sysfs_entry md_chunk_size =
4213 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4216 resync_start_show(struct mddev *mddev, char *page)
4218 if (mddev->recovery_cp == MaxSector)
4219 return sprintf(page, "none\n");
4220 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4224 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4226 unsigned long long n;
4229 if (cmd_match(buf, "none"))
4232 err = kstrtoull(buf, 10, &n);
4235 if (n != (sector_t)n)
4239 err = mddev_lock(mddev);
4242 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4246 mddev->recovery_cp = n;
4248 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4250 mddev_unlock(mddev);
4253 static struct md_sysfs_entry md_resync_start =
4254 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4255 resync_start_show, resync_start_store);
4258 * The array state can be:
4261 * No devices, no size, no level
4262 * Equivalent to STOP_ARRAY ioctl
4264 * May have some settings, but array is not active
4265 * all IO results in error
4266 * When written, doesn't tear down array, but just stops it
4267 * suspended (not supported yet)
4268 * All IO requests will block. The array can be reconfigured.
4269 * Writing this, if accepted, will block until array is quiescent
4271 * no resync can happen. no superblocks get written.
4272 * write requests fail
4274 * like readonly, but behaves like 'clean' on a write request.
4276 * clean - no pending writes, but otherwise active.
4277 * When written to inactive array, starts without resync
4278 * If a write request arrives then
4279 * if metadata is known, mark 'dirty' and switch to 'active'.
4280 * if not known, block and switch to write-pending
4281 * If written to an active array that has pending writes, then fails.
4283 * fully active: IO and resync can be happening.
4284 * When written to inactive array, starts with resync
4287 * clean, but writes are blocked waiting for 'active' to be written.
4290 * like active, but no writes have been seen for a while (100msec).
4293 * Array is failed. It's useful because mounted-arrays aren't stopped
4294 * when array is failed, so this state will at least alert the user that
4295 * something is wrong.
4297 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4298 write_pending, active_idle, broken, bad_word};
4299 static char *array_states[] = {
4300 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4301 "write-pending", "active-idle", "broken", NULL };
4303 static int match_word(const char *word, char **list)
4306 for (n=0; list[n]; n++)
4307 if (cmd_match(word, list[n]))
4313 array_state_show(struct mddev *mddev, char *page)
4315 enum array_state st = inactive;
4317 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4326 spin_lock(&mddev->lock);
4327 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4329 else if (mddev->in_sync)
4331 else if (mddev->safemode)
4335 spin_unlock(&mddev->lock);
4338 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4341 if (list_empty(&mddev->disks) &&
4342 mddev->raid_disks == 0 &&
4343 mddev->dev_sectors == 0)
4348 return sprintf(page, "%s\n", array_states[st]);
4351 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4352 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4353 static int restart_array(struct mddev *mddev);
4356 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4359 enum array_state st = match_word(buf, array_states);
4361 if (mddev->pers && (st == active || st == clean) &&
4362 mddev->ro != MD_RDONLY) {
4363 /* don't take reconfig_mutex when toggling between
4366 spin_lock(&mddev->lock);
4368 restart_array(mddev);
4369 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4370 md_wakeup_thread(mddev->thread);
4371 wake_up(&mddev->sb_wait);
4372 } else /* st == clean */ {
4373 restart_array(mddev);
4374 if (!set_in_sync(mddev))
4378 sysfs_notify_dirent_safe(mddev->sysfs_state);
4379 spin_unlock(&mddev->lock);
4382 err = mddev_lock(mddev);
4390 /* stopping an active array */
4391 err = do_md_stop(mddev, 0, NULL);
4394 /* stopping an active array */
4396 err = do_md_stop(mddev, 2, NULL);
4398 err = 0; /* already inactive */
4401 break; /* not supported yet */
4404 err = md_set_readonly(mddev, NULL);
4406 mddev->ro = MD_RDONLY;
4407 set_disk_ro(mddev->gendisk, 1);
4408 err = do_md_run(mddev);
4413 if (md_is_rdwr(mddev))
4414 err = md_set_readonly(mddev, NULL);
4415 else if (mddev->ro == MD_RDONLY)
4416 err = restart_array(mddev);
4418 mddev->ro = MD_AUTO_READ;
4419 set_disk_ro(mddev->gendisk, 0);
4422 mddev->ro = MD_AUTO_READ;
4423 err = do_md_run(mddev);
4428 err = restart_array(mddev);
4431 spin_lock(&mddev->lock);
4432 if (!set_in_sync(mddev))
4434 spin_unlock(&mddev->lock);
4440 err = restart_array(mddev);
4443 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4444 wake_up(&mddev->sb_wait);
4447 mddev->ro = MD_RDWR;
4448 set_disk_ro(mddev->gendisk, 0);
4449 err = do_md_run(mddev);
4455 /* these cannot be set */
4460 if (mddev->hold_active == UNTIL_IOCTL)
4461 mddev->hold_active = 0;
4462 sysfs_notify_dirent_safe(mddev->sysfs_state);
4464 mddev_unlock(mddev);
4467 static struct md_sysfs_entry md_array_state =
4468 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4471 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4472 return sprintf(page, "%d\n",
4473 atomic_read(&mddev->max_corr_read_errors));
4477 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4482 rv = kstrtouint(buf, 10, &n);
4487 atomic_set(&mddev->max_corr_read_errors, n);
4491 static struct md_sysfs_entry max_corr_read_errors =
4492 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4493 max_corrected_read_errors_store);
4496 null_show(struct mddev *mddev, char *page)
4502 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4504 /* buf must be %d:%d\n? giving major and minor numbers */
4505 /* The new device is added to the array.
4506 * If the array has a persistent superblock, we read the
4507 * superblock to initialise info and check validity.
4508 * Otherwise, only checking done is that in bind_rdev_to_array,
4509 * which mainly checks size.
4512 int major = simple_strtoul(buf, &e, 10);
4515 struct md_rdev *rdev;
4518 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4520 minor = simple_strtoul(e+1, &e, 10);
4521 if (*e && *e != '\n')
4523 dev = MKDEV(major, minor);
4524 if (major != MAJOR(dev) ||
4525 minor != MINOR(dev))
4528 err = mddev_lock(mddev);
4531 if (mddev->persistent) {
4532 rdev = md_import_device(dev, mddev->major_version,
4533 mddev->minor_version);
4534 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4535 struct md_rdev *rdev0
4536 = list_entry(mddev->disks.next,
4537 struct md_rdev, same_set);
4538 err = super_types[mddev->major_version]
4539 .load_super(rdev, rdev0, mddev->minor_version);
4543 } else if (mddev->external)
4544 rdev = md_import_device(dev, -2, -1);
4546 rdev = md_import_device(dev, -1, -1);
4549 mddev_unlock(mddev);
4550 return PTR_ERR(rdev);
4552 err = bind_rdev_to_array(rdev, mddev);
4555 export_rdev(rdev, mddev);
4556 mddev_unlock(mddev);
4559 return err ? err : len;
4562 static struct md_sysfs_entry md_new_device =
4563 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4566 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4569 unsigned long chunk, end_chunk;
4572 err = mddev_lock(mddev);
4577 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4579 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4580 if (buf == end) break;
4581 if (*end == '-') { /* range */
4583 end_chunk = simple_strtoul(buf, &end, 0);
4584 if (buf == end) break;
4586 if (*end && !isspace(*end)) break;
4587 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4588 buf = skip_spaces(end);
4590 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4592 mddev_unlock(mddev);
4596 static struct md_sysfs_entry md_bitmap =
4597 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4600 size_show(struct mddev *mddev, char *page)
4602 return sprintf(page, "%llu\n",
4603 (unsigned long long)mddev->dev_sectors / 2);
4606 static int update_size(struct mddev *mddev, sector_t num_sectors);
4609 size_store(struct mddev *mddev, const char *buf, size_t len)
4611 /* If array is inactive, we can reduce the component size, but
4612 * not increase it (except from 0).
4613 * If array is active, we can try an on-line resize
4616 int err = strict_blocks_to_sectors(buf, §ors);
4620 err = mddev_lock(mddev);
4624 err = update_size(mddev, sectors);
4626 md_update_sb(mddev, 1);
4628 if (mddev->dev_sectors == 0 ||
4629 mddev->dev_sectors > sectors)
4630 mddev->dev_sectors = sectors;
4634 mddev_unlock(mddev);
4635 return err ? err : len;
4638 static struct md_sysfs_entry md_size =
4639 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4641 /* Metadata version.
4643 * 'none' for arrays with no metadata (good luck...)
4644 * 'external' for arrays with externally managed metadata,
4645 * or N.M for internally known formats
4648 metadata_show(struct mddev *mddev, char *page)
4650 if (mddev->persistent)
4651 return sprintf(page, "%d.%d\n",
4652 mddev->major_version, mddev->minor_version);
4653 else if (mddev->external)
4654 return sprintf(page, "external:%s\n", mddev->metadata_type);
4656 return sprintf(page, "none\n");
4660 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4665 /* Changing the details of 'external' metadata is
4666 * always permitted. Otherwise there must be
4667 * no devices attached to the array.
4670 err = mddev_lock(mddev);
4674 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4676 else if (!list_empty(&mddev->disks))
4680 if (cmd_match(buf, "none")) {
4681 mddev->persistent = 0;
4682 mddev->external = 0;
4683 mddev->major_version = 0;
4684 mddev->minor_version = 90;
4687 if (strncmp(buf, "external:", 9) == 0) {
4688 size_t namelen = len-9;
4689 if (namelen >= sizeof(mddev->metadata_type))
4690 namelen = sizeof(mddev->metadata_type)-1;
4691 strncpy(mddev->metadata_type, buf+9, namelen);
4692 mddev->metadata_type[namelen] = 0;
4693 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4694 mddev->metadata_type[--namelen] = 0;
4695 mddev->persistent = 0;
4696 mddev->external = 1;
4697 mddev->major_version = 0;
4698 mddev->minor_version = 90;
4701 major = simple_strtoul(buf, &e, 10);
4703 if (e==buf || *e != '.')
4706 minor = simple_strtoul(buf, &e, 10);
4707 if (e==buf || (*e && *e != '\n') )
4710 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4712 mddev->major_version = major;
4713 mddev->minor_version = minor;
4714 mddev->persistent = 1;
4715 mddev->external = 0;
4718 mddev_unlock(mddev);
4722 static struct md_sysfs_entry md_metadata =
4723 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4726 action_show(struct mddev *mddev, char *page)
4728 char *type = "idle";
4729 unsigned long recovery = mddev->recovery;
4730 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4732 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4733 (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4734 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4736 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4737 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4739 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4743 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4745 else if (mddev->reshape_position != MaxSector)
4748 return sprintf(page, "%s\n", type);
4751 static void stop_sync_thread(struct mddev *mddev)
4753 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4756 if (mddev_lock(mddev))
4760 * Check again in case MD_RECOVERY_RUNNING is cleared before lock is
4763 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4764 mddev_unlock(mddev);
4768 if (work_pending(&mddev->del_work))
4769 flush_workqueue(md_misc_wq);
4771 if (mddev->sync_thread) {
4772 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4773 md_reap_sync_thread(mddev);
4776 mddev_unlock(mddev);
4779 static void idle_sync_thread(struct mddev *mddev)
4781 mutex_lock(&mddev->sync_mutex);
4782 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4783 stop_sync_thread(mddev);
4784 mutex_unlock(&mddev->sync_mutex);
4787 static void frozen_sync_thread(struct mddev *mddev)
4789 mutex_lock(&mddev->sync_mutex);
4790 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4791 stop_sync_thread(mddev);
4792 mutex_unlock(&mddev->sync_mutex);
4796 action_store(struct mddev *mddev, const char *page, size_t len)
4798 if (!mddev->pers || !mddev->pers->sync_request)
4802 if (cmd_match(page, "idle"))
4803 idle_sync_thread(mddev);
4804 else if (cmd_match(page, "frozen"))
4805 frozen_sync_thread(mddev);
4806 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4808 else if (cmd_match(page, "resync"))
4809 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4810 else if (cmd_match(page, "recover")) {
4811 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4812 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4813 } else if (cmd_match(page, "reshape")) {
4815 if (mddev->pers->start_reshape == NULL)
4817 err = mddev_lock(mddev);
4819 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4821 } else if (mddev->reshape_position == MaxSector ||
4822 mddev->pers->check_reshape == NULL ||
4823 mddev->pers->check_reshape(mddev)) {
4824 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4825 err = mddev->pers->start_reshape(mddev);
4828 * If reshape is still in progress, and
4829 * md_check_recovery() can continue to reshape,
4830 * don't restart reshape because data can be
4831 * corrupted for raid456.
4833 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4835 mddev_unlock(mddev);
4839 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4841 if (cmd_match(page, "check"))
4842 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4843 else if (!cmd_match(page, "repair"))
4845 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4846 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4847 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4849 if (mddev->ro == MD_AUTO_READ) {
4850 /* A write to sync_action is enough to justify
4851 * canceling read-auto mode
4853 mddev->ro = MD_RDWR;
4854 md_wakeup_thread(mddev->sync_thread);
4856 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4857 md_wakeup_thread(mddev->thread);
4858 sysfs_notify_dirent_safe(mddev->sysfs_action);
4862 static struct md_sysfs_entry md_scan_mode =
4863 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4866 last_sync_action_show(struct mddev *mddev, char *page)
4868 return sprintf(page, "%s\n", mddev->last_sync_action);
4871 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4874 mismatch_cnt_show(struct mddev *mddev, char *page)
4876 return sprintf(page, "%llu\n",
4877 (unsigned long long)
4878 atomic64_read(&mddev->resync_mismatches));
4881 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4884 sync_min_show(struct mddev *mddev, char *page)
4886 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4887 mddev->sync_speed_min ? "local": "system");
4891 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4896 if (strncmp(buf, "system", 6)==0) {
4899 rv = kstrtouint(buf, 10, &min);
4905 mddev->sync_speed_min = min;
4909 static struct md_sysfs_entry md_sync_min =
4910 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4913 sync_max_show(struct mddev *mddev, char *page)
4915 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4916 mddev->sync_speed_max ? "local": "system");
4920 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4925 if (strncmp(buf, "system", 6)==0) {
4928 rv = kstrtouint(buf, 10, &max);
4934 mddev->sync_speed_max = max;
4938 static struct md_sysfs_entry md_sync_max =
4939 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4942 degraded_show(struct mddev *mddev, char *page)
4944 return sprintf(page, "%d\n", mddev->degraded);
4946 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4949 sync_force_parallel_show(struct mddev *mddev, char *page)
4951 return sprintf(page, "%d\n", mddev->parallel_resync);
4955 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4959 if (kstrtol(buf, 10, &n))
4962 if (n != 0 && n != 1)
4965 mddev->parallel_resync = n;
4967 if (mddev->sync_thread)
4968 wake_up(&resync_wait);
4973 /* force parallel resync, even with shared block devices */
4974 static struct md_sysfs_entry md_sync_force_parallel =
4975 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4976 sync_force_parallel_show, sync_force_parallel_store);
4979 sync_speed_show(struct mddev *mddev, char *page)
4981 unsigned long resync, dt, db;
4982 if (mddev->curr_resync == MD_RESYNC_NONE)
4983 return sprintf(page, "none\n");
4984 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4985 dt = (jiffies - mddev->resync_mark) / HZ;
4987 db = resync - mddev->resync_mark_cnt;
4988 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4991 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4994 sync_completed_show(struct mddev *mddev, char *page)
4996 unsigned long long max_sectors, resync;
4998 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4999 return sprintf(page, "none\n");
5001 if (mddev->curr_resync == MD_RESYNC_YIELDED ||
5002 mddev->curr_resync == MD_RESYNC_DELAYED)
5003 return sprintf(page, "delayed\n");
5005 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5006 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5007 max_sectors = mddev->resync_max_sectors;
5009 max_sectors = mddev->dev_sectors;
5011 resync = mddev->curr_resync_completed;
5012 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5015 static struct md_sysfs_entry md_sync_completed =
5016 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5019 min_sync_show(struct mddev *mddev, char *page)
5021 return sprintf(page, "%llu\n",
5022 (unsigned long long)mddev->resync_min);
5025 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5027 unsigned long long min;
5030 if (kstrtoull(buf, 10, &min))
5033 spin_lock(&mddev->lock);
5035 if (min > mddev->resync_max)
5039 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5042 /* Round down to multiple of 4K for safety */
5043 mddev->resync_min = round_down(min, 8);
5047 spin_unlock(&mddev->lock);
5051 static struct md_sysfs_entry md_min_sync =
5052 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5055 max_sync_show(struct mddev *mddev, char *page)
5057 if (mddev->resync_max == MaxSector)
5058 return sprintf(page, "max\n");
5060 return sprintf(page, "%llu\n",
5061 (unsigned long long)mddev->resync_max);
5064 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5067 spin_lock(&mddev->lock);
5068 if (strncmp(buf, "max", 3) == 0)
5069 mddev->resync_max = MaxSector;
5071 unsigned long long max;
5075 if (kstrtoull(buf, 10, &max))
5077 if (max < mddev->resync_min)
5081 if (max < mddev->resync_max && md_is_rdwr(mddev) &&
5082 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5085 /* Must be a multiple of chunk_size */
5086 chunk = mddev->chunk_sectors;
5088 sector_t temp = max;
5091 if (sector_div(temp, chunk))
5094 mddev->resync_max = max;
5096 wake_up(&mddev->recovery_wait);
5099 spin_unlock(&mddev->lock);
5103 static struct md_sysfs_entry md_max_sync =
5104 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5107 suspend_lo_show(struct mddev *mddev, char *page)
5109 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5113 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5115 unsigned long long new;
5118 err = kstrtoull(buf, 10, &new);
5121 if (new != (sector_t)new)
5124 err = mddev_lock(mddev);
5128 if (mddev->pers == NULL ||
5129 mddev->pers->quiesce == NULL)
5131 mddev_suspend(mddev);
5132 mddev->suspend_lo = new;
5133 mddev_resume(mddev);
5137 mddev_unlock(mddev);
5140 static struct md_sysfs_entry md_suspend_lo =
5141 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5144 suspend_hi_show(struct mddev *mddev, char *page)
5146 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5150 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5152 unsigned long long new;
5155 err = kstrtoull(buf, 10, &new);
5158 if (new != (sector_t)new)
5161 err = mddev_lock(mddev);
5165 if (mddev->pers == NULL)
5168 mddev_suspend(mddev);
5169 mddev->suspend_hi = new;
5170 mddev_resume(mddev);
5174 mddev_unlock(mddev);
5177 static struct md_sysfs_entry md_suspend_hi =
5178 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5181 reshape_position_show(struct mddev *mddev, char *page)
5183 if (mddev->reshape_position != MaxSector)
5184 return sprintf(page, "%llu\n",
5185 (unsigned long long)mddev->reshape_position);
5186 strcpy(page, "none\n");
5191 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5193 struct md_rdev *rdev;
5194 unsigned long long new;
5197 err = kstrtoull(buf, 10, &new);
5200 if (new != (sector_t)new)
5202 err = mddev_lock(mddev);
5208 mddev->reshape_position = new;
5209 mddev->delta_disks = 0;
5210 mddev->reshape_backwards = 0;
5211 mddev->new_level = mddev->level;
5212 mddev->new_layout = mddev->layout;
5213 mddev->new_chunk_sectors = mddev->chunk_sectors;
5214 rdev_for_each(rdev, mddev)
5215 rdev->new_data_offset = rdev->data_offset;
5218 mddev_unlock(mddev);
5222 static struct md_sysfs_entry md_reshape_position =
5223 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5224 reshape_position_store);
5227 reshape_direction_show(struct mddev *mddev, char *page)
5229 return sprintf(page, "%s\n",
5230 mddev->reshape_backwards ? "backwards" : "forwards");
5234 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5239 if (cmd_match(buf, "forwards"))
5241 else if (cmd_match(buf, "backwards"))
5245 if (mddev->reshape_backwards == backwards)
5248 err = mddev_lock(mddev);
5251 /* check if we are allowed to change */
5252 if (mddev->delta_disks)
5254 else if (mddev->persistent &&
5255 mddev->major_version == 0)
5258 mddev->reshape_backwards = backwards;
5259 mddev_unlock(mddev);
5263 static struct md_sysfs_entry md_reshape_direction =
5264 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5265 reshape_direction_store);
5268 array_size_show(struct mddev *mddev, char *page)
5270 if (mddev->external_size)
5271 return sprintf(page, "%llu\n",
5272 (unsigned long long)mddev->array_sectors/2);
5274 return sprintf(page, "default\n");
5278 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5283 err = mddev_lock(mddev);
5287 /* cluster raid doesn't support change array_sectors */
5288 if (mddev_is_clustered(mddev)) {
5289 mddev_unlock(mddev);
5293 if (strncmp(buf, "default", 7) == 0) {
5295 sectors = mddev->pers->size(mddev, 0, 0);
5297 sectors = mddev->array_sectors;
5299 mddev->external_size = 0;
5301 if (strict_blocks_to_sectors(buf, §ors) < 0)
5303 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5306 mddev->external_size = 1;
5310 mddev->array_sectors = sectors;
5312 set_capacity_and_notify(mddev->gendisk,
5313 mddev->array_sectors);
5315 mddev_unlock(mddev);
5319 static struct md_sysfs_entry md_array_size =
5320 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5324 consistency_policy_show(struct mddev *mddev, char *page)
5328 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5329 ret = sprintf(page, "journal\n");
5330 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5331 ret = sprintf(page, "ppl\n");
5332 } else if (mddev->bitmap) {
5333 ret = sprintf(page, "bitmap\n");
5334 } else if (mddev->pers) {
5335 if (mddev->pers->sync_request)
5336 ret = sprintf(page, "resync\n");
5338 ret = sprintf(page, "none\n");
5340 ret = sprintf(page, "unknown\n");
5347 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5352 if (mddev->pers->change_consistency_policy)
5353 err = mddev->pers->change_consistency_policy(mddev, buf);
5356 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5357 set_bit(MD_HAS_PPL, &mddev->flags);
5362 return err ? err : len;
5365 static struct md_sysfs_entry md_consistency_policy =
5366 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5367 consistency_policy_store);
5369 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5371 return sprintf(page, "%d\n", mddev->fail_last_dev);
5375 * Setting fail_last_dev to true to allow last device to be forcibly removed
5376 * from RAID1/RAID10.
5379 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5384 ret = kstrtobool(buf, &value);
5388 if (value != mddev->fail_last_dev)
5389 mddev->fail_last_dev = value;
5393 static struct md_sysfs_entry md_fail_last_dev =
5394 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5395 fail_last_dev_store);
5397 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5399 if (mddev->pers == NULL || (mddev->pers->level != 1))
5400 return sprintf(page, "n/a\n");
5402 return sprintf(page, "%d\n", mddev->serialize_policy);
5406 * Setting serialize_policy to true to enforce write IO is not reordered
5410 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5415 err = kstrtobool(buf, &value);
5419 if (value == mddev->serialize_policy)
5422 err = mddev_lock(mddev);
5425 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5426 pr_err("md: serialize_policy is only effective for raid1\n");
5431 mddev_suspend(mddev);
5433 mddev_create_serial_pool(mddev, NULL, true);
5435 mddev_destroy_serial_pool(mddev, NULL, true);
5436 mddev->serialize_policy = value;
5437 mddev_resume(mddev);
5439 mddev_unlock(mddev);
5443 static struct md_sysfs_entry md_serialize_policy =
5444 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5445 serialize_policy_store);
5448 static struct attribute *md_default_attrs[] = {
5451 &md_raid_disks.attr,
5453 &md_chunk_size.attr,
5455 &md_resync_start.attr,
5457 &md_new_device.attr,
5458 &md_safe_delay.attr,
5459 &md_array_state.attr,
5460 &md_reshape_position.attr,
5461 &md_reshape_direction.attr,
5462 &md_array_size.attr,
5463 &max_corr_read_errors.attr,
5464 &md_consistency_policy.attr,
5465 &md_fail_last_dev.attr,
5466 &md_serialize_policy.attr,
5470 static const struct attribute_group md_default_group = {
5471 .attrs = md_default_attrs,
5474 static struct attribute *md_redundancy_attrs[] = {
5476 &md_last_scan_mode.attr,
5477 &md_mismatches.attr,
5480 &md_sync_speed.attr,
5481 &md_sync_force_parallel.attr,
5482 &md_sync_completed.attr,
5485 &md_suspend_lo.attr,
5486 &md_suspend_hi.attr,
5491 static const struct attribute_group md_redundancy_group = {
5493 .attrs = md_redundancy_attrs,
5496 static const struct attribute_group *md_attr_groups[] = {
5503 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5505 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5506 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5511 spin_lock(&all_mddevs_lock);
5512 if (!mddev_get(mddev)) {
5513 spin_unlock(&all_mddevs_lock);
5516 spin_unlock(&all_mddevs_lock);
5518 rv = entry->show(mddev, page);
5524 md_attr_store(struct kobject *kobj, struct attribute *attr,
5525 const char *page, size_t length)
5527 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5528 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5533 if (!capable(CAP_SYS_ADMIN))
5535 spin_lock(&all_mddevs_lock);
5536 if (!mddev_get(mddev)) {
5537 spin_unlock(&all_mddevs_lock);
5540 spin_unlock(&all_mddevs_lock);
5541 rv = entry->store(mddev, page, length);
5546 static void md_kobj_release(struct kobject *ko)
5548 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5550 if (mddev->sysfs_state)
5551 sysfs_put(mddev->sysfs_state);
5552 if (mddev->sysfs_level)
5553 sysfs_put(mddev->sysfs_level);
5555 del_gendisk(mddev->gendisk);
5556 put_disk(mddev->gendisk);
5559 static const struct sysfs_ops md_sysfs_ops = {
5560 .show = md_attr_show,
5561 .store = md_attr_store,
5563 static const struct kobj_type md_ktype = {
5564 .release = md_kobj_release,
5565 .sysfs_ops = &md_sysfs_ops,
5566 .default_groups = md_attr_groups,
5571 static void mddev_delayed_delete(struct work_struct *ws)
5573 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5575 kobject_put(&mddev->kobj);
5578 static void no_op(struct percpu_ref *r) {}
5580 int mddev_init_writes_pending(struct mddev *mddev)
5582 if (mddev->writes_pending.percpu_count_ptr)
5584 if (percpu_ref_init(&mddev->writes_pending, no_op,
5585 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5587 /* We want to start with the refcount at zero */
5588 percpu_ref_put(&mddev->writes_pending);
5591 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5593 struct mddev *md_alloc(dev_t dev, char *name)
5596 * If dev is zero, name is the name of a device to allocate with
5597 * an arbitrary minor number. It will be "md_???"
5598 * If dev is non-zero it must be a device number with a MAJOR of
5599 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5600 * the device is being created by opening a node in /dev.
5601 * If "name" is not NULL, the device is being created by
5602 * writing to /sys/module/md_mod/parameters/new_array.
5604 static DEFINE_MUTEX(disks_mutex);
5605 struct mddev *mddev;
5606 struct gendisk *disk;
5613 * Wait for any previous instance of this device to be completely
5614 * removed (mddev_delayed_delete).
5616 flush_workqueue(md_misc_wq);
5618 mutex_lock(&disks_mutex);
5619 mddev = mddev_alloc(dev);
5620 if (IS_ERR(mddev)) {
5621 error = PTR_ERR(mddev);
5625 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5626 shift = partitioned ? MdpMinorShift : 0;
5627 unit = MINOR(mddev->unit) >> shift;
5630 /* Need to ensure that 'name' is not a duplicate.
5632 struct mddev *mddev2;
5633 spin_lock(&all_mddevs_lock);
5635 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5636 if (mddev2->gendisk &&
5637 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5638 spin_unlock(&all_mddevs_lock);
5640 goto out_free_mddev;
5642 spin_unlock(&all_mddevs_lock);
5646 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5648 mddev->hold_active = UNTIL_STOP;
5651 disk = blk_alloc_disk(NUMA_NO_NODE);
5653 goto out_free_mddev;
5655 disk->major = MAJOR(mddev->unit);
5656 disk->first_minor = unit << shift;
5657 disk->minors = 1 << shift;
5659 strcpy(disk->disk_name, name);
5660 else if (partitioned)
5661 sprintf(disk->disk_name, "md_d%d", unit);
5663 sprintf(disk->disk_name, "md%d", unit);
5664 disk->fops = &md_fops;
5665 disk->private_data = mddev;
5667 mddev->queue = disk->queue;
5668 blk_set_stacking_limits(&mddev->queue->limits);
5669 blk_queue_write_cache(mddev->queue, true, true);
5670 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5671 mddev->gendisk = disk;
5672 error = add_disk(disk);
5676 kobject_init(&mddev->kobj, &md_ktype);
5677 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5680 * The disk is already live at this point. Clear the hold flag
5681 * and let mddev_put take care of the deletion, as it isn't any
5682 * different from a normal close on last release now.
5684 mddev->hold_active = 0;
5685 mutex_unlock(&disks_mutex);
5687 return ERR_PTR(error);
5690 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5691 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5692 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5693 mutex_unlock(&disks_mutex);
5701 mutex_unlock(&disks_mutex);
5702 return ERR_PTR(error);
5705 static int md_alloc_and_put(dev_t dev, char *name)
5707 struct mddev *mddev = md_alloc(dev, name);
5710 return PTR_ERR(mddev);
5715 static void md_probe(dev_t dev)
5717 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5720 md_alloc_and_put(dev, NULL);
5723 static int add_named_array(const char *val, const struct kernel_param *kp)
5726 * val must be "md_*" or "mdNNN".
5727 * For "md_*" we allocate an array with a large free minor number, and
5728 * set the name to val. val must not already be an active name.
5729 * For "mdNNN" we allocate an array with the minor number NNN
5730 * which must not already be in use.
5732 int len = strlen(val);
5733 char buf[DISK_NAME_LEN];
5734 unsigned long devnum;
5736 while (len && val[len-1] == '\n')
5738 if (len >= DISK_NAME_LEN)
5740 strscpy(buf, val, len+1);
5741 if (strncmp(buf, "md_", 3) == 0)
5742 return md_alloc_and_put(0, buf);
5743 if (strncmp(buf, "md", 2) == 0 &&
5745 kstrtoul(buf+2, 10, &devnum) == 0 &&
5746 devnum <= MINORMASK)
5747 return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
5752 static void md_safemode_timeout(struct timer_list *t)
5754 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5756 mddev->safemode = 1;
5757 if (mddev->external)
5758 sysfs_notify_dirent_safe(mddev->sysfs_state);
5760 md_wakeup_thread(mddev->thread);
5763 static int start_dirty_degraded;
5764 static void active_io_release(struct percpu_ref *ref)
5766 struct mddev *mddev = container_of(ref, struct mddev, active_io);
5768 wake_up(&mddev->sb_wait);
5771 int md_run(struct mddev *mddev)
5774 struct md_rdev *rdev;
5775 struct md_personality *pers;
5778 if (list_empty(&mddev->disks))
5779 /* cannot run an array with no devices.. */
5784 /* Cannot run until previous stop completes properly */
5785 if (mddev->sysfs_active)
5789 * Analyze all RAID superblock(s)
5791 if (!mddev->raid_disks) {
5792 if (!mddev->persistent)
5794 err = analyze_sbs(mddev);
5799 if (mddev->level != LEVEL_NONE)
5800 request_module("md-level-%d", mddev->level);
5801 else if (mddev->clevel[0])
5802 request_module("md-%s", mddev->clevel);
5805 * Drop all container device buffers, from now on
5806 * the only valid external interface is through the md
5809 mddev->has_superblocks = false;
5810 rdev_for_each(rdev, mddev) {
5811 if (test_bit(Faulty, &rdev->flags))
5813 sync_blockdev(rdev->bdev);
5814 invalidate_bdev(rdev->bdev);
5815 if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
5816 mddev->ro = MD_RDONLY;
5818 set_disk_ro(mddev->gendisk, 1);
5822 mddev->has_superblocks = true;
5824 /* perform some consistency tests on the device.
5825 * We don't want the data to overlap the metadata,
5826 * Internal Bitmap issues have been handled elsewhere.
5828 if (rdev->meta_bdev) {
5829 /* Nothing to check */;
5830 } else if (rdev->data_offset < rdev->sb_start) {
5831 if (mddev->dev_sectors &&
5832 rdev->data_offset + mddev->dev_sectors
5834 pr_warn("md: %s: data overlaps metadata\n",
5839 if (rdev->sb_start + rdev->sb_size/512
5840 > rdev->data_offset) {
5841 pr_warn("md: %s: metadata overlaps data\n",
5846 sysfs_notify_dirent_safe(rdev->sysfs_state);
5847 nowait = nowait && bdev_nowait(rdev->bdev);
5850 err = percpu_ref_init(&mddev->active_io, active_io_release,
5851 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL);
5855 if (!bioset_initialized(&mddev->bio_set)) {
5856 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5858 goto exit_active_io;
5860 if (!bioset_initialized(&mddev->sync_set)) {
5861 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5866 spin_lock(&pers_lock);
5867 pers = find_pers(mddev->level, mddev->clevel);
5868 if (!pers || !try_module_get(pers->owner)) {
5869 spin_unlock(&pers_lock);
5870 if (mddev->level != LEVEL_NONE)
5871 pr_warn("md: personality for level %d is not loaded!\n",
5874 pr_warn("md: personality for level %s is not loaded!\n",
5879 spin_unlock(&pers_lock);
5880 if (mddev->level != pers->level) {
5881 mddev->level = pers->level;
5882 mddev->new_level = pers->level;
5884 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5886 if (mddev->reshape_position != MaxSector &&
5887 pers->start_reshape == NULL) {
5888 /* This personality cannot handle reshaping... */
5889 module_put(pers->owner);
5894 if (pers->sync_request) {
5895 /* Warn if this is a potentially silly
5898 struct md_rdev *rdev2;
5901 rdev_for_each(rdev, mddev)
5902 rdev_for_each(rdev2, mddev) {
5904 rdev->bdev->bd_disk ==
5905 rdev2->bdev->bd_disk) {
5906 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
5915 pr_warn("True protection against single-disk failure might be compromised.\n");
5918 mddev->recovery = 0;
5919 /* may be over-ridden by personality */
5920 mddev->resync_max_sectors = mddev->dev_sectors;
5922 mddev->ok_start_degraded = start_dirty_degraded;
5924 if (start_readonly && md_is_rdwr(mddev))
5925 mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
5927 err = pers->run(mddev);
5929 pr_warn("md: pers->run() failed ...\n");
5930 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5931 WARN_ONCE(!mddev->external_size,
5932 "%s: default size too small, but 'external_size' not in effect?\n",
5934 pr_warn("md: invalid array_size %llu > default size %llu\n",
5935 (unsigned long long)mddev->array_sectors / 2,
5936 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5939 if (err == 0 && pers->sync_request &&
5940 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5941 struct bitmap *bitmap;
5943 bitmap = md_bitmap_create(mddev, -1);
5944 if (IS_ERR(bitmap)) {
5945 err = PTR_ERR(bitmap);
5946 pr_warn("%s: failed to create bitmap (%d)\n",
5947 mdname(mddev), err);
5949 mddev->bitmap = bitmap;
5955 if (mddev->bitmap_info.max_write_behind > 0) {
5956 bool create_pool = false;
5958 rdev_for_each(rdev, mddev) {
5959 if (test_bit(WriteMostly, &rdev->flags) &&
5960 rdev_init_serial(rdev))
5963 if (create_pool && mddev->serial_info_pool == NULL) {
5964 mddev->serial_info_pool =
5965 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5966 sizeof(struct serial_info));
5967 if (!mddev->serial_info_pool) {
5977 rdev_for_each(rdev, mddev) {
5978 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
5983 if (mddev->degraded)
5986 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5988 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5989 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
5991 /* Set the NOWAIT flags if all underlying devices support it */
5993 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
5995 if (pers->sync_request) {
5996 if (mddev->kobj.sd &&
5997 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5998 pr_warn("md: cannot register extra attributes for %s\n",
6000 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6001 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6002 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6003 } else if (mddev->ro == MD_AUTO_READ)
6004 mddev->ro = MD_RDWR;
6006 atomic_set(&mddev->max_corr_read_errors,
6007 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6008 mddev->safemode = 0;
6009 if (mddev_is_clustered(mddev))
6010 mddev->safemode_delay = 0;
6012 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6015 spin_lock(&mddev->lock);
6017 spin_unlock(&mddev->lock);
6018 rdev_for_each(rdev, mddev)
6019 if (rdev->raid_disk >= 0)
6020 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6022 if (mddev->degraded && md_is_rdwr(mddev))
6023 /* This ensures that recovering status is reported immediately
6024 * via sysfs - until a lack of spares is confirmed.
6026 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6027 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6029 if (mddev->sb_flags)
6030 md_update_sb(mddev, 0);
6036 mddev_detach(mddev);
6038 pers->free(mddev, mddev->private);
6039 mddev->private = NULL;
6040 module_put(pers->owner);
6041 md_bitmap_destroy(mddev);
6043 bioset_exit(&mddev->sync_set);
6045 bioset_exit(&mddev->bio_set);
6047 percpu_ref_exit(&mddev->active_io);
6050 EXPORT_SYMBOL_GPL(md_run);
6052 int do_md_run(struct mddev *mddev)
6056 set_bit(MD_NOT_READY, &mddev->flags);
6057 err = md_run(mddev);
6060 err = md_bitmap_load(mddev);
6062 md_bitmap_destroy(mddev);
6066 if (mddev_is_clustered(mddev))
6067 md_allow_write(mddev);
6069 /* run start up tasks that require md_thread */
6072 md_wakeup_thread(mddev->thread);
6073 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6075 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6076 clear_bit(MD_NOT_READY, &mddev->flags);
6078 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6079 sysfs_notify_dirent_safe(mddev->sysfs_state);
6080 sysfs_notify_dirent_safe(mddev->sysfs_action);
6081 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6083 clear_bit(MD_NOT_READY, &mddev->flags);
6087 int md_start(struct mddev *mddev)
6091 if (mddev->pers->start) {
6092 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6093 md_wakeup_thread(mddev->thread);
6094 ret = mddev->pers->start(mddev);
6095 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6096 md_wakeup_thread(mddev->sync_thread);
6100 EXPORT_SYMBOL_GPL(md_start);
6102 static int restart_array(struct mddev *mddev)
6104 struct gendisk *disk = mddev->gendisk;
6105 struct md_rdev *rdev;
6106 bool has_journal = false;
6107 bool has_readonly = false;
6109 /* Complain if it has no devices */
6110 if (list_empty(&mddev->disks))
6114 if (md_is_rdwr(mddev))
6118 rdev_for_each_rcu(rdev, mddev) {
6119 if (test_bit(Journal, &rdev->flags) &&
6120 !test_bit(Faulty, &rdev->flags))
6122 if (rdev_read_only(rdev))
6123 has_readonly = true;
6126 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6127 /* Don't restart rw with journal missing/faulty */
6132 mddev->safemode = 0;
6133 mddev->ro = MD_RDWR;
6134 set_disk_ro(disk, 0);
6135 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6136 /* Kick recovery or resync if necessary */
6137 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6138 md_wakeup_thread(mddev->thread);
6139 md_wakeup_thread(mddev->sync_thread);
6140 sysfs_notify_dirent_safe(mddev->sysfs_state);
6144 static void md_clean(struct mddev *mddev)
6146 mddev->array_sectors = 0;
6147 mddev->external_size = 0;
6148 mddev->dev_sectors = 0;
6149 mddev->raid_disks = 0;
6150 mddev->recovery_cp = 0;
6151 mddev->resync_min = 0;
6152 mddev->resync_max = MaxSector;
6153 mddev->reshape_position = MaxSector;
6154 /* we still need mddev->external in export_rdev, do not clear it yet */
6155 mddev->persistent = 0;
6156 mddev->level = LEVEL_NONE;
6157 mddev->clevel[0] = 0;
6159 mddev->sb_flags = 0;
6160 mddev->ro = MD_RDWR;
6161 mddev->metadata_type[0] = 0;
6162 mddev->chunk_sectors = 0;
6163 mddev->ctime = mddev->utime = 0;
6165 mddev->max_disks = 0;
6167 mddev->can_decrease_events = 0;
6168 mddev->delta_disks = 0;
6169 mddev->reshape_backwards = 0;
6170 mddev->new_level = LEVEL_NONE;
6171 mddev->new_layout = 0;
6172 mddev->new_chunk_sectors = 0;
6173 mddev->curr_resync = MD_RESYNC_NONE;
6174 atomic64_set(&mddev->resync_mismatches, 0);
6175 mddev->suspend_lo = mddev->suspend_hi = 0;
6176 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6177 mddev->recovery = 0;
6180 mddev->degraded = 0;
6181 mddev->safemode = 0;
6182 mddev->private = NULL;
6183 mddev->cluster_info = NULL;
6184 mddev->bitmap_info.offset = 0;
6185 mddev->bitmap_info.default_offset = 0;
6186 mddev->bitmap_info.default_space = 0;
6187 mddev->bitmap_info.chunksize = 0;
6188 mddev->bitmap_info.daemon_sleep = 0;
6189 mddev->bitmap_info.max_write_behind = 0;
6190 mddev->bitmap_info.nodes = 0;
6193 static void __md_stop_writes(struct mddev *mddev)
6195 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6196 if (work_pending(&mddev->del_work))
6197 flush_workqueue(md_misc_wq);
6198 if (mddev->sync_thread) {
6199 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6200 md_reap_sync_thread(mddev);
6203 del_timer_sync(&mddev->safemode_timer);
6205 if (mddev->pers && mddev->pers->quiesce) {
6206 mddev->pers->quiesce(mddev, 1);
6207 mddev->pers->quiesce(mddev, 0);
6209 md_bitmap_flush(mddev);
6211 if (md_is_rdwr(mddev) &&
6212 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6214 /* mark array as shutdown cleanly */
6215 if (!mddev_is_clustered(mddev))
6217 md_update_sb(mddev, 1);
6219 /* disable policy to guarantee rdevs free resources for serialization */
6220 mddev->serialize_policy = 0;
6221 mddev_destroy_serial_pool(mddev, NULL, true);
6224 void md_stop_writes(struct mddev *mddev)
6226 mddev_lock_nointr(mddev);
6227 __md_stop_writes(mddev);
6228 mddev_unlock(mddev);
6230 EXPORT_SYMBOL_GPL(md_stop_writes);
6232 static void mddev_detach(struct mddev *mddev)
6234 md_bitmap_wait_behind_writes(mddev);
6235 if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
6236 mddev->pers->quiesce(mddev, 1);
6237 mddev->pers->quiesce(mddev, 0);
6239 md_unregister_thread(&mddev->thread);
6241 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6244 static void __md_stop(struct mddev *mddev)
6246 struct md_personality *pers = mddev->pers;
6247 md_bitmap_destroy(mddev);
6248 mddev_detach(mddev);
6249 /* Ensure ->event_work is done */
6250 if (mddev->event_work.func)
6251 flush_workqueue(md_misc_wq);
6252 spin_lock(&mddev->lock);
6254 spin_unlock(&mddev->lock);
6256 pers->free(mddev, mddev->private);
6257 mddev->private = NULL;
6258 if (pers->sync_request && mddev->to_remove == NULL)
6259 mddev->to_remove = &md_redundancy_group;
6260 module_put(pers->owner);
6261 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6263 percpu_ref_exit(&mddev->active_io);
6264 bioset_exit(&mddev->bio_set);
6265 bioset_exit(&mddev->sync_set);
6268 void md_stop(struct mddev *mddev)
6270 /* stop the array and free an attached data structures.
6271 * This is called from dm-raid
6273 __md_stop_writes(mddev);
6275 percpu_ref_exit(&mddev->writes_pending);
6278 EXPORT_SYMBOL_GPL(md_stop);
6280 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6285 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6287 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6288 md_wakeup_thread(mddev->thread);
6290 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6291 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6294 * Thread might be blocked waiting for metadata update which will now
6297 md_wakeup_thread_directly(mddev->sync_thread);
6299 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6301 mddev_unlock(mddev);
6302 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6304 wait_event(mddev->sb_wait,
6305 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6306 mddev_lock_nointr(mddev);
6308 mutex_lock(&mddev->open_mutex);
6309 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6310 mddev->sync_thread ||
6311 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6312 pr_warn("md: %s still in use.\n",mdname(mddev));
6314 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6315 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6316 md_wakeup_thread(mddev->thread);
6322 __md_stop_writes(mddev);
6325 if (mddev->ro == MD_RDONLY)
6327 mddev->ro = MD_RDONLY;
6328 set_disk_ro(mddev->gendisk, 1);
6329 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6330 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6331 md_wakeup_thread(mddev->thread);
6332 sysfs_notify_dirent_safe(mddev->sysfs_state);
6336 mutex_unlock(&mddev->open_mutex);
6341 * 0 - completely stop and dis-assemble array
6342 * 2 - stop but do not disassemble array
6344 static int do_md_stop(struct mddev *mddev, int mode,
6345 struct block_device *bdev)
6347 struct gendisk *disk = mddev->gendisk;
6348 struct md_rdev *rdev;
6351 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6353 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6354 md_wakeup_thread(mddev->thread);
6356 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6357 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6360 * Thread might be blocked waiting for metadata update which will now
6363 md_wakeup_thread_directly(mddev->sync_thread);
6365 mddev_unlock(mddev);
6366 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6367 !test_bit(MD_RECOVERY_RUNNING,
6368 &mddev->recovery)));
6369 mddev_lock_nointr(mddev);
6371 mutex_lock(&mddev->open_mutex);
6372 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6373 mddev->sysfs_active ||
6374 mddev->sync_thread ||
6375 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6376 pr_warn("md: %s still in use.\n",mdname(mddev));
6377 mutex_unlock(&mddev->open_mutex);
6379 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6380 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6381 md_wakeup_thread(mddev->thread);
6386 if (!md_is_rdwr(mddev))
6387 set_disk_ro(disk, 0);
6389 __md_stop_writes(mddev);
6392 /* tell userspace to handle 'inactive' */
6393 sysfs_notify_dirent_safe(mddev->sysfs_state);
6395 rdev_for_each(rdev, mddev)
6396 if (rdev->raid_disk >= 0)
6397 sysfs_unlink_rdev(mddev, rdev);
6399 set_capacity_and_notify(disk, 0);
6400 mutex_unlock(&mddev->open_mutex);
6403 if (!md_is_rdwr(mddev))
6404 mddev->ro = MD_RDWR;
6406 mutex_unlock(&mddev->open_mutex);
6408 * Free resources if final stop
6411 pr_info("md: %s stopped.\n", mdname(mddev));
6413 if (mddev->bitmap_info.file) {
6414 struct file *f = mddev->bitmap_info.file;
6415 spin_lock(&mddev->lock);
6416 mddev->bitmap_info.file = NULL;
6417 spin_unlock(&mddev->lock);
6420 mddev->bitmap_info.offset = 0;
6422 export_array(mddev);
6425 if (mddev->hold_active == UNTIL_STOP)
6426 mddev->hold_active = 0;
6429 sysfs_notify_dirent_safe(mddev->sysfs_state);
6434 static void autorun_array(struct mddev *mddev)
6436 struct md_rdev *rdev;
6439 if (list_empty(&mddev->disks))
6442 pr_info("md: running: ");
6444 rdev_for_each(rdev, mddev) {
6445 pr_cont("<%pg>", rdev->bdev);
6449 err = do_md_run(mddev);
6451 pr_warn("md: do_md_run() returned %d\n", err);
6452 do_md_stop(mddev, 0, NULL);
6457 * lets try to run arrays based on all disks that have arrived
6458 * until now. (those are in pending_raid_disks)
6460 * the method: pick the first pending disk, collect all disks with
6461 * the same UUID, remove all from the pending list and put them into
6462 * the 'same_array' list. Then order this list based on superblock
6463 * update time (freshest comes first), kick out 'old' disks and
6464 * compare superblocks. If everything's fine then run it.
6466 * If "unit" is allocated, then bump its reference count
6468 static void autorun_devices(int part)
6470 struct md_rdev *rdev0, *rdev, *tmp;
6471 struct mddev *mddev;
6473 pr_info("md: autorun ...\n");
6474 while (!list_empty(&pending_raid_disks)) {
6477 LIST_HEAD(candidates);
6478 rdev0 = list_entry(pending_raid_disks.next,
6479 struct md_rdev, same_set);
6481 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6482 INIT_LIST_HEAD(&candidates);
6483 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6484 if (super_90_load(rdev, rdev0, 0) >= 0) {
6485 pr_debug("md: adding %pg ...\n",
6487 list_move(&rdev->same_set, &candidates);
6490 * now we have a set of devices, with all of them having
6491 * mostly sane superblocks. It's time to allocate the
6495 dev = MKDEV(mdp_major,
6496 rdev0->preferred_minor << MdpMinorShift);
6497 unit = MINOR(dev) >> MdpMinorShift;
6499 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6502 if (rdev0->preferred_minor != unit) {
6503 pr_warn("md: unit number in %pg is bad: %d\n",
6504 rdev0->bdev, rdev0->preferred_minor);
6508 mddev = md_alloc(dev, NULL);
6512 if (mddev_lock(mddev))
6513 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6514 else if (mddev->raid_disks || mddev->major_version
6515 || !list_empty(&mddev->disks)) {
6516 pr_warn("md: %s already running, cannot run %pg\n",
6517 mdname(mddev), rdev0->bdev);
6518 mddev_unlock(mddev);
6520 pr_debug("md: created %s\n", mdname(mddev));
6521 mddev->persistent = 1;
6522 rdev_for_each_list(rdev, tmp, &candidates) {
6523 list_del_init(&rdev->same_set);
6524 if (bind_rdev_to_array(rdev, mddev))
6525 export_rdev(rdev, mddev);
6527 autorun_array(mddev);
6528 mddev_unlock(mddev);
6530 /* on success, candidates will be empty, on error
6533 rdev_for_each_list(rdev, tmp, &candidates) {
6534 list_del_init(&rdev->same_set);
6535 export_rdev(rdev, mddev);
6539 pr_info("md: ... autorun DONE.\n");
6541 #endif /* !MODULE */
6543 static int get_version(void __user *arg)
6547 ver.major = MD_MAJOR_VERSION;
6548 ver.minor = MD_MINOR_VERSION;
6549 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6551 if (copy_to_user(arg, &ver, sizeof(ver)))
6557 static int get_array_info(struct mddev *mddev, void __user *arg)
6559 mdu_array_info_t info;
6560 int nr,working,insync,failed,spare;
6561 struct md_rdev *rdev;
6563 nr = working = insync = failed = spare = 0;
6565 rdev_for_each_rcu(rdev, mddev) {
6567 if (test_bit(Faulty, &rdev->flags))
6571 if (test_bit(In_sync, &rdev->flags))
6573 else if (test_bit(Journal, &rdev->flags))
6574 /* TODO: add journal count to md_u.h */
6582 info.major_version = mddev->major_version;
6583 info.minor_version = mddev->minor_version;
6584 info.patch_version = MD_PATCHLEVEL_VERSION;
6585 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6586 info.level = mddev->level;
6587 info.size = mddev->dev_sectors / 2;
6588 if (info.size != mddev->dev_sectors / 2) /* overflow */
6591 info.raid_disks = mddev->raid_disks;
6592 info.md_minor = mddev->md_minor;
6593 info.not_persistent= !mddev->persistent;
6595 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6598 info.state = (1<<MD_SB_CLEAN);
6599 if (mddev->bitmap && mddev->bitmap_info.offset)
6600 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6601 if (mddev_is_clustered(mddev))
6602 info.state |= (1<<MD_SB_CLUSTERED);
6603 info.active_disks = insync;
6604 info.working_disks = working;
6605 info.failed_disks = failed;
6606 info.spare_disks = spare;
6608 info.layout = mddev->layout;
6609 info.chunk_size = mddev->chunk_sectors << 9;
6611 if (copy_to_user(arg, &info, sizeof(info)))
6617 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6619 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6623 file = kzalloc(sizeof(*file), GFP_NOIO);
6628 spin_lock(&mddev->lock);
6629 /* bitmap enabled */
6630 if (mddev->bitmap_info.file) {
6631 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6632 sizeof(file->pathname));
6636 memmove(file->pathname, ptr,
6637 sizeof(file->pathname)-(ptr-file->pathname));
6639 spin_unlock(&mddev->lock);
6642 copy_to_user(arg, file, sizeof(*file)))
6649 static int get_disk_info(struct mddev *mddev, void __user * arg)
6651 mdu_disk_info_t info;
6652 struct md_rdev *rdev;
6654 if (copy_from_user(&info, arg, sizeof(info)))
6658 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6660 info.major = MAJOR(rdev->bdev->bd_dev);
6661 info.minor = MINOR(rdev->bdev->bd_dev);
6662 info.raid_disk = rdev->raid_disk;
6664 if (test_bit(Faulty, &rdev->flags))
6665 info.state |= (1<<MD_DISK_FAULTY);
6666 else if (test_bit(In_sync, &rdev->flags)) {
6667 info.state |= (1<<MD_DISK_ACTIVE);
6668 info.state |= (1<<MD_DISK_SYNC);
6670 if (test_bit(Journal, &rdev->flags))
6671 info.state |= (1<<MD_DISK_JOURNAL);
6672 if (test_bit(WriteMostly, &rdev->flags))
6673 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6674 if (test_bit(FailFast, &rdev->flags))
6675 info.state |= (1<<MD_DISK_FAILFAST);
6677 info.major = info.minor = 0;
6678 info.raid_disk = -1;
6679 info.state = (1<<MD_DISK_REMOVED);
6683 if (copy_to_user(arg, &info, sizeof(info)))
6689 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6691 struct md_rdev *rdev;
6692 dev_t dev = MKDEV(info->major,info->minor);
6694 if (mddev_is_clustered(mddev) &&
6695 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6696 pr_warn("%s: Cannot add to clustered mddev.\n",
6701 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6704 if (!mddev->raid_disks) {
6706 /* expecting a device which has a superblock */
6707 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6709 pr_warn("md: md_import_device returned %ld\n",
6711 return PTR_ERR(rdev);
6713 if (!list_empty(&mddev->disks)) {
6714 struct md_rdev *rdev0
6715 = list_entry(mddev->disks.next,
6716 struct md_rdev, same_set);
6717 err = super_types[mddev->major_version]
6718 .load_super(rdev, rdev0, mddev->minor_version);
6720 pr_warn("md: %pg has different UUID to %pg\n",
6723 export_rdev(rdev, mddev);
6727 err = bind_rdev_to_array(rdev, mddev);
6729 export_rdev(rdev, mddev);
6734 * md_add_new_disk can be used once the array is assembled
6735 * to add "hot spares". They must already have a superblock
6740 if (!mddev->pers->hot_add_disk) {
6741 pr_warn("%s: personality does not support diskops!\n",
6745 if (mddev->persistent)
6746 rdev = md_import_device(dev, mddev->major_version,
6747 mddev->minor_version);
6749 rdev = md_import_device(dev, -1, -1);
6751 pr_warn("md: md_import_device returned %ld\n",
6753 return PTR_ERR(rdev);
6755 /* set saved_raid_disk if appropriate */
6756 if (!mddev->persistent) {
6757 if (info->state & (1<<MD_DISK_SYNC) &&
6758 info->raid_disk < mddev->raid_disks) {
6759 rdev->raid_disk = info->raid_disk;
6760 clear_bit(Bitmap_sync, &rdev->flags);
6762 rdev->raid_disk = -1;
6763 rdev->saved_raid_disk = rdev->raid_disk;
6765 super_types[mddev->major_version].
6766 validate_super(mddev, rdev);
6767 if ((info->state & (1<<MD_DISK_SYNC)) &&
6768 rdev->raid_disk != info->raid_disk) {
6769 /* This was a hot-add request, but events doesn't
6770 * match, so reject it.
6772 export_rdev(rdev, mddev);
6776 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6777 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6778 set_bit(WriteMostly, &rdev->flags);
6780 clear_bit(WriteMostly, &rdev->flags);
6781 if (info->state & (1<<MD_DISK_FAILFAST))
6782 set_bit(FailFast, &rdev->flags);
6784 clear_bit(FailFast, &rdev->flags);
6786 if (info->state & (1<<MD_DISK_JOURNAL)) {
6787 struct md_rdev *rdev2;
6788 bool has_journal = false;
6790 /* make sure no existing journal disk */
6791 rdev_for_each(rdev2, mddev) {
6792 if (test_bit(Journal, &rdev2->flags)) {
6797 if (has_journal || mddev->bitmap) {
6798 export_rdev(rdev, mddev);
6801 set_bit(Journal, &rdev->flags);
6804 * check whether the device shows up in other nodes
6806 if (mddev_is_clustered(mddev)) {
6807 if (info->state & (1 << MD_DISK_CANDIDATE))
6808 set_bit(Candidate, &rdev->flags);
6809 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6810 /* --add initiated by this node */
6811 err = md_cluster_ops->add_new_disk(mddev, rdev);
6813 export_rdev(rdev, mddev);
6819 rdev->raid_disk = -1;
6820 err = bind_rdev_to_array(rdev, mddev);
6823 export_rdev(rdev, mddev);
6825 if (mddev_is_clustered(mddev)) {
6826 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6828 err = md_cluster_ops->new_disk_ack(mddev,
6831 md_kick_rdev_from_array(rdev);
6835 md_cluster_ops->add_new_disk_cancel(mddev);
6837 err = add_bound_rdev(rdev);
6841 err = add_bound_rdev(rdev);
6846 /* otherwise, md_add_new_disk is only allowed
6847 * for major_version==0 superblocks
6849 if (mddev->major_version != 0) {
6850 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6854 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6856 rdev = md_import_device(dev, -1, 0);
6858 pr_warn("md: error, md_import_device() returned %ld\n",
6860 return PTR_ERR(rdev);
6862 rdev->desc_nr = info->number;
6863 if (info->raid_disk < mddev->raid_disks)
6864 rdev->raid_disk = info->raid_disk;
6866 rdev->raid_disk = -1;
6868 if (rdev->raid_disk < mddev->raid_disks)
6869 if (info->state & (1<<MD_DISK_SYNC))
6870 set_bit(In_sync, &rdev->flags);
6872 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6873 set_bit(WriteMostly, &rdev->flags);
6874 if (info->state & (1<<MD_DISK_FAILFAST))
6875 set_bit(FailFast, &rdev->flags);
6877 if (!mddev->persistent) {
6878 pr_debug("md: nonpersistent superblock ...\n");
6879 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6881 rdev->sb_start = calc_dev_sboffset(rdev);
6882 rdev->sectors = rdev->sb_start;
6884 err = bind_rdev_to_array(rdev, mddev);
6886 export_rdev(rdev, mddev);
6894 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6896 struct md_rdev *rdev;
6901 rdev = find_rdev(mddev, dev);
6905 if (rdev->raid_disk < 0)
6908 clear_bit(Blocked, &rdev->flags);
6909 remove_and_add_spares(mddev, rdev);
6911 if (rdev->raid_disk >= 0)
6915 if (mddev_is_clustered(mddev)) {
6916 if (md_cluster_ops->remove_disk(mddev, rdev))
6920 md_kick_rdev_from_array(rdev);
6921 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6923 md_wakeup_thread(mddev->thread);
6925 md_update_sb(mddev, 1);
6930 pr_debug("md: cannot remove active disk %pg from %s ...\n",
6931 rdev->bdev, mdname(mddev));
6935 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6938 struct md_rdev *rdev;
6943 if (mddev->major_version != 0) {
6944 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6948 if (!mddev->pers->hot_add_disk) {
6949 pr_warn("%s: personality does not support diskops!\n",
6954 rdev = md_import_device(dev, -1, 0);
6956 pr_warn("md: error, md_import_device() returned %ld\n",
6961 if (mddev->persistent)
6962 rdev->sb_start = calc_dev_sboffset(rdev);
6964 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6966 rdev->sectors = rdev->sb_start;
6968 if (test_bit(Faulty, &rdev->flags)) {
6969 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
6970 rdev->bdev, mdname(mddev));
6975 clear_bit(In_sync, &rdev->flags);
6977 rdev->saved_raid_disk = -1;
6978 err = bind_rdev_to_array(rdev, mddev);
6983 * The rest should better be atomic, we can have disk failures
6984 * noticed in interrupt contexts ...
6987 rdev->raid_disk = -1;
6989 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6991 md_update_sb(mddev, 1);
6993 * If the new disk does not support REQ_NOWAIT,
6994 * disable on the whole MD.
6996 if (!bdev_nowait(rdev->bdev)) {
6997 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
6998 mdname(mddev), rdev->bdev);
6999 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
7002 * Kick recovery, maybe this spare has to be added to the
7003 * array immediately.
7005 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7006 md_wakeup_thread(mddev->thread);
7011 export_rdev(rdev, mddev);
7015 static int set_bitmap_file(struct mddev *mddev, int fd)
7020 if (!mddev->pers->quiesce || !mddev->thread)
7022 if (mddev->recovery || mddev->sync_thread)
7024 /* we should be able to change the bitmap.. */
7028 struct inode *inode;
7031 if (mddev->bitmap || mddev->bitmap_info.file)
7032 return -EEXIST; /* cannot add when bitmap is present */
7036 pr_warn("%s: error: failed to get bitmap file\n",
7041 inode = f->f_mapping->host;
7042 if (!S_ISREG(inode->i_mode)) {
7043 pr_warn("%s: error: bitmap file must be a regular file\n",
7046 } else if (!(f->f_mode & FMODE_WRITE)) {
7047 pr_warn("%s: error: bitmap file must open for write\n",
7050 } else if (atomic_read(&inode->i_writecount) != 1) {
7051 pr_warn("%s: error: bitmap file is already in use\n",
7059 mddev->bitmap_info.file = f;
7060 mddev->bitmap_info.offset = 0; /* file overrides offset */
7061 } else if (mddev->bitmap == NULL)
7062 return -ENOENT; /* cannot remove what isn't there */
7066 struct bitmap *bitmap;
7068 bitmap = md_bitmap_create(mddev, -1);
7069 mddev_suspend(mddev);
7070 if (!IS_ERR(bitmap)) {
7071 mddev->bitmap = bitmap;
7072 err = md_bitmap_load(mddev);
7074 err = PTR_ERR(bitmap);
7076 md_bitmap_destroy(mddev);
7079 mddev_resume(mddev);
7080 } else if (fd < 0) {
7081 mddev_suspend(mddev);
7082 md_bitmap_destroy(mddev);
7083 mddev_resume(mddev);
7087 struct file *f = mddev->bitmap_info.file;
7089 spin_lock(&mddev->lock);
7090 mddev->bitmap_info.file = NULL;
7091 spin_unlock(&mddev->lock);
7100 * md_set_array_info is used two different ways
7101 * The original usage is when creating a new array.
7102 * In this usage, raid_disks is > 0 and it together with
7103 * level, size, not_persistent,layout,chunksize determine the
7104 * shape of the array.
7105 * This will always create an array with a type-0.90.0 superblock.
7106 * The newer usage is when assembling an array.
7107 * In this case raid_disks will be 0, and the major_version field is
7108 * use to determine which style super-blocks are to be found on the devices.
7109 * The minor and patch _version numbers are also kept incase the
7110 * super_block handler wishes to interpret them.
7112 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7114 if (info->raid_disks == 0) {
7115 /* just setting version number for superblock loading */
7116 if (info->major_version < 0 ||
7117 info->major_version >= ARRAY_SIZE(super_types) ||
7118 super_types[info->major_version].name == NULL) {
7119 /* maybe try to auto-load a module? */
7120 pr_warn("md: superblock version %d not known\n",
7121 info->major_version);
7124 mddev->major_version = info->major_version;
7125 mddev->minor_version = info->minor_version;
7126 mddev->patch_version = info->patch_version;
7127 mddev->persistent = !info->not_persistent;
7128 /* ensure mddev_put doesn't delete this now that there
7129 * is some minimal configuration.
7131 mddev->ctime = ktime_get_real_seconds();
7134 mddev->major_version = MD_MAJOR_VERSION;
7135 mddev->minor_version = MD_MINOR_VERSION;
7136 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7137 mddev->ctime = ktime_get_real_seconds();
7139 mddev->level = info->level;
7140 mddev->clevel[0] = 0;
7141 mddev->dev_sectors = 2 * (sector_t)info->size;
7142 mddev->raid_disks = info->raid_disks;
7143 /* don't set md_minor, it is determined by which /dev/md* was
7146 if (info->state & (1<<MD_SB_CLEAN))
7147 mddev->recovery_cp = MaxSector;
7149 mddev->recovery_cp = 0;
7150 mddev->persistent = ! info->not_persistent;
7151 mddev->external = 0;
7153 mddev->layout = info->layout;
7154 if (mddev->level == 0)
7155 /* Cannot trust RAID0 layout info here */
7157 mddev->chunk_sectors = info->chunk_size >> 9;
7159 if (mddev->persistent) {
7160 mddev->max_disks = MD_SB_DISKS;
7162 mddev->sb_flags = 0;
7164 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7166 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7167 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7168 mddev->bitmap_info.offset = 0;
7170 mddev->reshape_position = MaxSector;
7173 * Generate a 128 bit UUID
7175 get_random_bytes(mddev->uuid, 16);
7177 mddev->new_level = mddev->level;
7178 mddev->new_chunk_sectors = mddev->chunk_sectors;
7179 mddev->new_layout = mddev->layout;
7180 mddev->delta_disks = 0;
7181 mddev->reshape_backwards = 0;
7186 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7188 lockdep_assert_held(&mddev->reconfig_mutex);
7190 if (mddev->external_size)
7193 mddev->array_sectors = array_sectors;
7195 EXPORT_SYMBOL(md_set_array_sectors);
7197 static int update_size(struct mddev *mddev, sector_t num_sectors)
7199 struct md_rdev *rdev;
7201 int fit = (num_sectors == 0);
7202 sector_t old_dev_sectors = mddev->dev_sectors;
7204 if (mddev->pers->resize == NULL)
7206 /* The "num_sectors" is the number of sectors of each device that
7207 * is used. This can only make sense for arrays with redundancy.
7208 * linear and raid0 always use whatever space is available. We can only
7209 * consider changing this number if no resync or reconstruction is
7210 * happening, and if the new size is acceptable. It must fit before the
7211 * sb_start or, if that is <data_offset, it must fit before the size
7212 * of each device. If num_sectors is zero, we find the largest size
7215 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7218 if (!md_is_rdwr(mddev))
7221 rdev_for_each(rdev, mddev) {
7222 sector_t avail = rdev->sectors;
7224 if (fit && (num_sectors == 0 || num_sectors > avail))
7225 num_sectors = avail;
7226 if (avail < num_sectors)
7229 rv = mddev->pers->resize(mddev, num_sectors);
7231 if (mddev_is_clustered(mddev))
7232 md_cluster_ops->update_size(mddev, old_dev_sectors);
7233 else if (mddev->queue) {
7234 set_capacity_and_notify(mddev->gendisk,
7235 mddev->array_sectors);
7241 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7244 struct md_rdev *rdev;
7245 /* change the number of raid disks */
7246 if (mddev->pers->check_reshape == NULL)
7248 if (!md_is_rdwr(mddev))
7250 if (raid_disks <= 0 ||
7251 (mddev->max_disks && raid_disks >= mddev->max_disks))
7253 if (mddev->sync_thread ||
7254 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7255 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7256 mddev->reshape_position != MaxSector)
7259 rdev_for_each(rdev, mddev) {
7260 if (mddev->raid_disks < raid_disks &&
7261 rdev->data_offset < rdev->new_data_offset)
7263 if (mddev->raid_disks > raid_disks &&
7264 rdev->data_offset > rdev->new_data_offset)
7268 mddev->delta_disks = raid_disks - mddev->raid_disks;
7269 if (mddev->delta_disks < 0)
7270 mddev->reshape_backwards = 1;
7271 else if (mddev->delta_disks > 0)
7272 mddev->reshape_backwards = 0;
7274 rv = mddev->pers->check_reshape(mddev);
7276 mddev->delta_disks = 0;
7277 mddev->reshape_backwards = 0;
7283 * update_array_info is used to change the configuration of an
7285 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7286 * fields in the info are checked against the array.
7287 * Any differences that cannot be handled will cause an error.
7288 * Normally, only one change can be managed at a time.
7290 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7296 /* calculate expected state,ignoring low bits */
7297 if (mddev->bitmap && mddev->bitmap_info.offset)
7298 state |= (1 << MD_SB_BITMAP_PRESENT);
7300 if (mddev->major_version != info->major_version ||
7301 mddev->minor_version != info->minor_version ||
7302 /* mddev->patch_version != info->patch_version || */
7303 mddev->ctime != info->ctime ||
7304 mddev->level != info->level ||
7305 /* mddev->layout != info->layout || */
7306 mddev->persistent != !info->not_persistent ||
7307 mddev->chunk_sectors != info->chunk_size >> 9 ||
7308 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7309 ((state^info->state) & 0xfffffe00)
7312 /* Check there is only one change */
7313 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7315 if (mddev->raid_disks != info->raid_disks)
7317 if (mddev->layout != info->layout)
7319 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7326 if (mddev->layout != info->layout) {
7328 * we don't need to do anything at the md level, the
7329 * personality will take care of it all.
7331 if (mddev->pers->check_reshape == NULL)
7334 mddev->new_layout = info->layout;
7335 rv = mddev->pers->check_reshape(mddev);
7337 mddev->new_layout = mddev->layout;
7341 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7342 rv = update_size(mddev, (sector_t)info->size * 2);
7344 if (mddev->raid_disks != info->raid_disks)
7345 rv = update_raid_disks(mddev, info->raid_disks);
7347 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7348 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7352 if (mddev->recovery || mddev->sync_thread) {
7356 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7357 struct bitmap *bitmap;
7358 /* add the bitmap */
7359 if (mddev->bitmap) {
7363 if (mddev->bitmap_info.default_offset == 0) {
7367 mddev->bitmap_info.offset =
7368 mddev->bitmap_info.default_offset;
7369 mddev->bitmap_info.space =
7370 mddev->bitmap_info.default_space;
7371 bitmap = md_bitmap_create(mddev, -1);
7372 mddev_suspend(mddev);
7373 if (!IS_ERR(bitmap)) {
7374 mddev->bitmap = bitmap;
7375 rv = md_bitmap_load(mddev);
7377 rv = PTR_ERR(bitmap);
7379 md_bitmap_destroy(mddev);
7380 mddev_resume(mddev);
7382 /* remove the bitmap */
7383 if (!mddev->bitmap) {
7387 if (mddev->bitmap->storage.file) {
7391 if (mddev->bitmap_info.nodes) {
7392 /* hold PW on all the bitmap lock */
7393 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7394 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7396 md_cluster_ops->unlock_all_bitmaps(mddev);
7400 mddev->bitmap_info.nodes = 0;
7401 md_cluster_ops->leave(mddev);
7402 module_put(md_cluster_mod);
7403 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7405 mddev_suspend(mddev);
7406 md_bitmap_destroy(mddev);
7407 mddev_resume(mddev);
7408 mddev->bitmap_info.offset = 0;
7411 md_update_sb(mddev, 1);
7417 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7419 struct md_rdev *rdev;
7422 if (mddev->pers == NULL)
7426 rdev = md_find_rdev_rcu(mddev, dev);
7430 md_error(mddev, rdev);
7431 if (test_bit(MD_BROKEN, &mddev->flags))
7439 * We have a problem here : there is no easy way to give a CHS
7440 * virtual geometry. We currently pretend that we have a 2 heads
7441 * 4 sectors (with a BIG number of cylinders...). This drives
7442 * dosfs just mad... ;-)
7444 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7446 struct mddev *mddev = bdev->bd_disk->private_data;
7450 geo->cylinders = mddev->array_sectors / 8;
7454 static inline bool md_ioctl_valid(unsigned int cmd)
7458 case GET_ARRAY_INFO:
7459 case GET_BITMAP_FILE:
7462 case HOT_REMOVE_DISK:
7464 case RESTART_ARRAY_RW:
7466 case SET_ARRAY_INFO:
7467 case SET_BITMAP_FILE:
7468 case SET_DISK_FAULTY:
7471 case CLUSTERED_DISK_NACK:
7478 static int __md_set_array_info(struct mddev *mddev, void __user *argp)
7480 mdu_array_info_t info;
7484 memset(&info, 0, sizeof(info));
7485 else if (copy_from_user(&info, argp, sizeof(info)))
7489 err = update_array_info(mddev, &info);
7491 pr_warn("md: couldn't update array info. %d\n", err);
7495 if (!list_empty(&mddev->disks)) {
7496 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7500 if (mddev->raid_disks) {
7501 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7505 err = md_set_array_info(mddev, &info);
7507 pr_warn("md: couldn't set array info. %d\n", err);
7512 static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
7513 unsigned int cmd, unsigned long arg)
7516 void __user *argp = (void __user *)arg;
7517 struct mddev *mddev = NULL;
7518 bool did_set_md_closing = false;
7520 if (!md_ioctl_valid(cmd))
7525 case GET_ARRAY_INFO:
7529 if (!capable(CAP_SYS_ADMIN))
7534 * Commands dealing with the RAID driver but not any
7539 err = get_version(argp);
7545 * Commands creating/starting a new array:
7548 mddev = bdev->bd_disk->private_data;
7555 /* Some actions do not requires the mutex */
7557 case GET_ARRAY_INFO:
7558 if (!mddev->raid_disks && !mddev->external)
7561 err = get_array_info(mddev, argp);
7565 if (!mddev->raid_disks && !mddev->external)
7568 err = get_disk_info(mddev, argp);
7571 case SET_DISK_FAULTY:
7572 err = set_disk_faulty(mddev, new_decode_dev(arg));
7575 case GET_BITMAP_FILE:
7576 err = get_bitmap_file(mddev, argp);
7581 if (cmd == HOT_REMOVE_DISK)
7582 /* need to ensure recovery thread has run */
7583 wait_event_interruptible_timeout(mddev->sb_wait,
7584 !test_bit(MD_RECOVERY_NEEDED,
7586 msecs_to_jiffies(5000));
7587 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7588 /* Need to flush page cache, and ensure no-one else opens
7591 mutex_lock(&mddev->open_mutex);
7592 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7593 mutex_unlock(&mddev->open_mutex);
7597 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7598 mutex_unlock(&mddev->open_mutex);
7602 did_set_md_closing = true;
7603 mutex_unlock(&mddev->open_mutex);
7604 sync_blockdev(bdev);
7606 err = mddev_lock(mddev);
7608 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7613 if (cmd == SET_ARRAY_INFO) {
7614 err = __md_set_array_info(mddev, argp);
7619 * Commands querying/configuring an existing array:
7621 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7622 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7623 if ((!mddev->raid_disks && !mddev->external)
7624 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7625 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7626 && cmd != GET_BITMAP_FILE) {
7632 * Commands even a read-only array can execute:
7635 case RESTART_ARRAY_RW:
7636 err = restart_array(mddev);
7640 err = do_md_stop(mddev, 0, bdev);
7644 err = md_set_readonly(mddev, bdev);
7647 case HOT_REMOVE_DISK:
7648 err = hot_remove_disk(mddev, new_decode_dev(arg));
7652 /* We can support ADD_NEW_DISK on read-only arrays
7653 * only if we are re-adding a preexisting device.
7654 * So require mddev->pers and MD_DISK_SYNC.
7657 mdu_disk_info_t info;
7658 if (copy_from_user(&info, argp, sizeof(info)))
7660 else if (!(info.state & (1<<MD_DISK_SYNC)))
7661 /* Need to clear read-only for this */
7664 err = md_add_new_disk(mddev, &info);
7671 * The remaining ioctls are changing the state of the
7672 * superblock, so we do not allow them on read-only arrays.
7674 if (!md_is_rdwr(mddev) && mddev->pers) {
7675 if (mddev->ro != MD_AUTO_READ) {
7679 mddev->ro = MD_RDWR;
7680 sysfs_notify_dirent_safe(mddev->sysfs_state);
7681 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7682 /* mddev_unlock will wake thread */
7683 /* If a device failed while we were read-only, we
7684 * need to make sure the metadata is updated now.
7686 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7687 mddev_unlock(mddev);
7688 wait_event(mddev->sb_wait,
7689 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7690 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7691 mddev_lock_nointr(mddev);
7698 mdu_disk_info_t info;
7699 if (copy_from_user(&info, argp, sizeof(info)))
7702 err = md_add_new_disk(mddev, &info);
7706 case CLUSTERED_DISK_NACK:
7707 if (mddev_is_clustered(mddev))
7708 md_cluster_ops->new_disk_ack(mddev, false);
7714 err = hot_add_disk(mddev, new_decode_dev(arg));
7718 err = do_md_run(mddev);
7721 case SET_BITMAP_FILE:
7722 err = set_bitmap_file(mddev, (int)arg);
7731 if (mddev->hold_active == UNTIL_IOCTL &&
7733 mddev->hold_active = 0;
7734 mddev_unlock(mddev);
7736 if(did_set_md_closing)
7737 clear_bit(MD_CLOSING, &mddev->flags);
7740 #ifdef CONFIG_COMPAT
7741 static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
7742 unsigned int cmd, unsigned long arg)
7745 case HOT_REMOVE_DISK:
7747 case SET_DISK_FAULTY:
7748 case SET_BITMAP_FILE:
7749 /* These take in integer arg, do not convert */
7752 arg = (unsigned long)compat_ptr(arg);
7756 return md_ioctl(bdev, mode, cmd, arg);
7758 #endif /* CONFIG_COMPAT */
7760 static int md_set_read_only(struct block_device *bdev, bool ro)
7762 struct mddev *mddev = bdev->bd_disk->private_data;
7765 err = mddev_lock(mddev);
7769 if (!mddev->raid_disks && !mddev->external) {
7775 * Transitioning to read-auto need only happen for arrays that call
7776 * md_write_start and which are not ready for writes yet.
7778 if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
7779 err = restart_array(mddev);
7782 mddev->ro = MD_AUTO_READ;
7786 mddev_unlock(mddev);
7790 static int md_open(struct gendisk *disk, blk_mode_t mode)
7792 struct mddev *mddev;
7795 spin_lock(&all_mddevs_lock);
7796 mddev = mddev_get(disk->private_data);
7797 spin_unlock(&all_mddevs_lock);
7801 err = mutex_lock_interruptible(&mddev->open_mutex);
7806 if (test_bit(MD_CLOSING, &mddev->flags))
7809 atomic_inc(&mddev->openers);
7810 mutex_unlock(&mddev->open_mutex);
7812 disk_check_media_change(disk);
7816 mutex_unlock(&mddev->open_mutex);
7822 static void md_release(struct gendisk *disk)
7824 struct mddev *mddev = disk->private_data;
7827 atomic_dec(&mddev->openers);
7831 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7833 struct mddev *mddev = disk->private_data;
7834 unsigned int ret = 0;
7837 ret = DISK_EVENT_MEDIA_CHANGE;
7842 static void md_free_disk(struct gendisk *disk)
7844 struct mddev *mddev = disk->private_data;
7846 percpu_ref_exit(&mddev->writes_pending);
7850 const struct block_device_operations md_fops =
7852 .owner = THIS_MODULE,
7853 .submit_bio = md_submit_bio,
7855 .release = md_release,
7857 #ifdef CONFIG_COMPAT
7858 .compat_ioctl = md_compat_ioctl,
7860 .getgeo = md_getgeo,
7861 .check_events = md_check_events,
7862 .set_read_only = md_set_read_only,
7863 .free_disk = md_free_disk,
7866 static int md_thread(void *arg)
7868 struct md_thread *thread = arg;
7871 * md_thread is a 'system-thread', it's priority should be very
7872 * high. We avoid resource deadlocks individually in each
7873 * raid personality. (RAID5 does preallocation) We also use RR and
7874 * the very same RT priority as kswapd, thus we will never get
7875 * into a priority inversion deadlock.
7877 * we definitely have to have equal or higher priority than
7878 * bdflush, otherwise bdflush will deadlock if there are too
7879 * many dirty RAID5 blocks.
7882 allow_signal(SIGKILL);
7883 while (!kthread_should_stop()) {
7885 /* We need to wait INTERRUPTIBLE so that
7886 * we don't add to the load-average.
7887 * That means we need to be sure no signals are
7890 if (signal_pending(current))
7891 flush_signals(current);
7893 wait_event_interruptible_timeout
7895 test_bit(THREAD_WAKEUP, &thread->flags)
7896 || kthread_should_stop() || kthread_should_park(),
7899 clear_bit(THREAD_WAKEUP, &thread->flags);
7900 if (kthread_should_park())
7902 if (!kthread_should_stop())
7903 thread->run(thread);
7909 static void md_wakeup_thread_directly(struct md_thread __rcu *thread)
7911 struct md_thread *t;
7914 t = rcu_dereference(thread);
7916 wake_up_process(t->tsk);
7920 void md_wakeup_thread(struct md_thread __rcu *thread)
7922 struct md_thread *t;
7925 t = rcu_dereference(thread);
7927 pr_debug("md: waking up MD thread %s.\n", t->tsk->comm);
7928 set_bit(THREAD_WAKEUP, &t->flags);
7929 wake_up(&t->wqueue);
7933 EXPORT_SYMBOL(md_wakeup_thread);
7935 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7936 struct mddev *mddev, const char *name)
7938 struct md_thread *thread;
7940 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7944 init_waitqueue_head(&thread->wqueue);
7947 thread->mddev = mddev;
7948 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7949 thread->tsk = kthread_run(md_thread, thread,
7951 mdname(thread->mddev),
7953 if (IS_ERR(thread->tsk)) {
7959 EXPORT_SYMBOL(md_register_thread);
7961 void md_unregister_thread(struct md_thread __rcu **threadp)
7963 struct md_thread *thread = rcu_dereference_protected(*threadp, true);
7968 rcu_assign_pointer(*threadp, NULL);
7971 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7972 kthread_stop(thread->tsk);
7975 EXPORT_SYMBOL(md_unregister_thread);
7977 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7979 if (!rdev || test_bit(Faulty, &rdev->flags))
7982 if (!mddev->pers || !mddev->pers->error_handler)
7984 mddev->pers->error_handler(mddev, rdev);
7986 if (mddev->pers->level == 0 || mddev->pers->level == LEVEL_LINEAR)
7989 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
7990 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7991 sysfs_notify_dirent_safe(rdev->sysfs_state);
7992 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7993 if (!test_bit(MD_BROKEN, &mddev->flags)) {
7994 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7995 md_wakeup_thread(mddev->thread);
7997 if (mddev->event_work.func)
7998 queue_work(md_misc_wq, &mddev->event_work);
8001 EXPORT_SYMBOL(md_error);
8003 /* seq_file implementation /proc/mdstat */
8005 static void status_unused(struct seq_file *seq)
8008 struct md_rdev *rdev;
8010 seq_printf(seq, "unused devices: ");
8012 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8014 seq_printf(seq, "%pg ", rdev->bdev);
8017 seq_printf(seq, "<none>");
8019 seq_printf(seq, "\n");
8022 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8024 sector_t max_sectors, resync, res;
8025 unsigned long dt, db = 0;
8026 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8027 int scale, recovery_active;
8028 unsigned int per_milli;
8030 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8031 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8032 max_sectors = mddev->resync_max_sectors;
8034 max_sectors = mddev->dev_sectors;
8036 resync = mddev->curr_resync;
8037 if (resync < MD_RESYNC_ACTIVE) {
8038 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8039 /* Still cleaning up */
8040 resync = max_sectors;
8041 } else if (resync > max_sectors) {
8042 resync = max_sectors;
8044 res = atomic_read(&mddev->recovery_active);
8046 * Resync has started, but the subtraction has overflowed or
8047 * yielded one of the special values. Force it to active to
8048 * ensure the status reports an active resync.
8050 if (resync < res || resync - res < MD_RESYNC_ACTIVE)
8051 resync = MD_RESYNC_ACTIVE;
8056 if (resync == MD_RESYNC_NONE) {
8057 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8058 struct md_rdev *rdev;
8060 rdev_for_each(rdev, mddev)
8061 if (rdev->raid_disk >= 0 &&
8062 !test_bit(Faulty, &rdev->flags) &&
8063 rdev->recovery_offset != MaxSector &&
8064 rdev->recovery_offset) {
8065 seq_printf(seq, "\trecover=REMOTE");
8068 if (mddev->reshape_position != MaxSector)
8069 seq_printf(seq, "\treshape=REMOTE");
8071 seq_printf(seq, "\tresync=REMOTE");
8074 if (mddev->recovery_cp < MaxSector) {
8075 seq_printf(seq, "\tresync=PENDING");
8080 if (resync < MD_RESYNC_ACTIVE) {
8081 seq_printf(seq, "\tresync=DELAYED");
8085 WARN_ON(max_sectors == 0);
8086 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8087 * in a sector_t, and (max_sectors>>scale) will fit in a
8088 * u32, as those are the requirements for sector_div.
8089 * Thus 'scale' must be at least 10
8092 if (sizeof(sector_t) > sizeof(unsigned long)) {
8093 while ( max_sectors/2 > (1ULL<<(scale+32)))
8096 res = (resync>>scale)*1000;
8097 sector_div(res, (u32)((max_sectors>>scale)+1));
8101 int i, x = per_milli/50, y = 20-x;
8102 seq_printf(seq, "[");
8103 for (i = 0; i < x; i++)
8104 seq_printf(seq, "=");
8105 seq_printf(seq, ">");
8106 for (i = 0; i < y; i++)
8107 seq_printf(seq, ".");
8108 seq_printf(seq, "] ");
8110 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8111 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8113 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8115 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8116 "resync" : "recovery"))),
8117 per_milli/10, per_milli % 10,
8118 (unsigned long long) resync/2,
8119 (unsigned long long) max_sectors/2);
8122 * dt: time from mark until now
8123 * db: blocks written from mark until now
8124 * rt: remaining time
8126 * rt is a sector_t, which is always 64bit now. We are keeping
8127 * the original algorithm, but it is not really necessary.
8129 * Original algorithm:
8130 * So we divide before multiply in case it is 32bit and close
8132 * We scale the divisor (db) by 32 to avoid losing precision
8133 * near the end of resync when the number of remaining sectors
8135 * We then divide rt by 32 after multiplying by db to compensate.
8136 * The '+1' avoids division by zero if db is very small.
8138 dt = ((jiffies - mddev->resync_mark) / HZ);
8141 curr_mark_cnt = mddev->curr_mark_cnt;
8142 recovery_active = atomic_read(&mddev->recovery_active);
8143 resync_mark_cnt = mddev->resync_mark_cnt;
8145 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8146 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8148 rt = max_sectors - resync; /* number of remaining sectors */
8149 rt = div64_u64(rt, db/32+1);
8153 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8154 ((unsigned long)rt % 60)/6);
8156 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8160 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8162 struct list_head *tmp;
8164 struct mddev *mddev;
8176 spin_lock(&all_mddevs_lock);
8177 list_for_each(tmp,&all_mddevs)
8179 mddev = list_entry(tmp, struct mddev, all_mddevs);
8180 if (!mddev_get(mddev))
8182 spin_unlock(&all_mddevs_lock);
8185 spin_unlock(&all_mddevs_lock);
8187 return (void*)2;/* tail */
8191 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8193 struct list_head *tmp;
8194 struct mddev *next_mddev, *mddev = v;
8195 struct mddev *to_put = NULL;
8201 spin_lock(&all_mddevs_lock);
8202 if (v == (void*)1) {
8203 tmp = all_mddevs.next;
8206 tmp = mddev->all_mddevs.next;
8210 if (tmp == &all_mddevs) {
8211 next_mddev = (void*)2;
8215 next_mddev = list_entry(tmp, struct mddev, all_mddevs);
8216 if (mddev_get(next_mddev))
8219 tmp = mddev->all_mddevs.next;
8221 spin_unlock(&all_mddevs_lock);
8229 static void md_seq_stop(struct seq_file *seq, void *v)
8231 struct mddev *mddev = v;
8233 if (mddev && v != (void*)1 && v != (void*)2)
8237 static int md_seq_show(struct seq_file *seq, void *v)
8239 struct mddev *mddev = v;
8241 struct md_rdev *rdev;
8243 if (v == (void*)1) {
8244 struct md_personality *pers;
8245 seq_printf(seq, "Personalities : ");
8246 spin_lock(&pers_lock);
8247 list_for_each_entry(pers, &pers_list, list)
8248 seq_printf(seq, "[%s] ", pers->name);
8250 spin_unlock(&pers_lock);
8251 seq_printf(seq, "\n");
8252 seq->poll_event = atomic_read(&md_event_count);
8255 if (v == (void*)2) {
8260 spin_lock(&mddev->lock);
8261 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8262 seq_printf(seq, "%s : %sactive", mdname(mddev),
8263 mddev->pers ? "" : "in");
8265 if (mddev->ro == MD_RDONLY)
8266 seq_printf(seq, " (read-only)");
8267 if (mddev->ro == MD_AUTO_READ)
8268 seq_printf(seq, " (auto-read-only)");
8269 seq_printf(seq, " %s", mddev->pers->name);
8274 rdev_for_each_rcu(rdev, mddev) {
8275 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8277 if (test_bit(WriteMostly, &rdev->flags))
8278 seq_printf(seq, "(W)");
8279 if (test_bit(Journal, &rdev->flags))
8280 seq_printf(seq, "(J)");
8281 if (test_bit(Faulty, &rdev->flags)) {
8282 seq_printf(seq, "(F)");
8285 if (rdev->raid_disk < 0)
8286 seq_printf(seq, "(S)"); /* spare */
8287 if (test_bit(Replacement, &rdev->flags))
8288 seq_printf(seq, "(R)");
8289 sectors += rdev->sectors;
8293 if (!list_empty(&mddev->disks)) {
8295 seq_printf(seq, "\n %llu blocks",
8296 (unsigned long long)
8297 mddev->array_sectors / 2);
8299 seq_printf(seq, "\n %llu blocks",
8300 (unsigned long long)sectors / 2);
8302 if (mddev->persistent) {
8303 if (mddev->major_version != 0 ||
8304 mddev->minor_version != 90) {
8305 seq_printf(seq," super %d.%d",
8306 mddev->major_version,
8307 mddev->minor_version);
8309 } else if (mddev->external)
8310 seq_printf(seq, " super external:%s",
8311 mddev->metadata_type);
8313 seq_printf(seq, " super non-persistent");
8316 mddev->pers->status(seq, mddev);
8317 seq_printf(seq, "\n ");
8318 if (mddev->pers->sync_request) {
8319 if (status_resync(seq, mddev))
8320 seq_printf(seq, "\n ");
8323 seq_printf(seq, "\n ");
8325 md_bitmap_status(seq, mddev->bitmap);
8327 seq_printf(seq, "\n");
8329 spin_unlock(&mddev->lock);
8334 static const struct seq_operations md_seq_ops = {
8335 .start = md_seq_start,
8336 .next = md_seq_next,
8337 .stop = md_seq_stop,
8338 .show = md_seq_show,
8341 static int md_seq_open(struct inode *inode, struct file *file)
8343 struct seq_file *seq;
8346 error = seq_open(file, &md_seq_ops);
8350 seq = file->private_data;
8351 seq->poll_event = atomic_read(&md_event_count);
8355 static int md_unloading;
8356 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8358 struct seq_file *seq = filp->private_data;
8362 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8363 poll_wait(filp, &md_event_waiters, wait);
8365 /* always allow read */
8366 mask = EPOLLIN | EPOLLRDNORM;
8368 if (seq->poll_event != atomic_read(&md_event_count))
8369 mask |= EPOLLERR | EPOLLPRI;
8373 static const struct proc_ops mdstat_proc_ops = {
8374 .proc_open = md_seq_open,
8375 .proc_read = seq_read,
8376 .proc_lseek = seq_lseek,
8377 .proc_release = seq_release,
8378 .proc_poll = mdstat_poll,
8381 int register_md_personality(struct md_personality *p)
8383 pr_debug("md: %s personality registered for level %d\n",
8385 spin_lock(&pers_lock);
8386 list_add_tail(&p->list, &pers_list);
8387 spin_unlock(&pers_lock);
8390 EXPORT_SYMBOL(register_md_personality);
8392 int unregister_md_personality(struct md_personality *p)
8394 pr_debug("md: %s personality unregistered\n", p->name);
8395 spin_lock(&pers_lock);
8396 list_del_init(&p->list);
8397 spin_unlock(&pers_lock);
8400 EXPORT_SYMBOL(unregister_md_personality);
8402 int register_md_cluster_operations(struct md_cluster_operations *ops,
8403 struct module *module)
8406 spin_lock(&pers_lock);
8407 if (md_cluster_ops != NULL)
8410 md_cluster_ops = ops;
8411 md_cluster_mod = module;
8413 spin_unlock(&pers_lock);
8416 EXPORT_SYMBOL(register_md_cluster_operations);
8418 int unregister_md_cluster_operations(void)
8420 spin_lock(&pers_lock);
8421 md_cluster_ops = NULL;
8422 spin_unlock(&pers_lock);
8425 EXPORT_SYMBOL(unregister_md_cluster_operations);
8427 int md_setup_cluster(struct mddev *mddev, int nodes)
8430 if (!md_cluster_ops)
8431 request_module("md-cluster");
8432 spin_lock(&pers_lock);
8433 /* ensure module won't be unloaded */
8434 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8435 pr_warn("can't find md-cluster module or get its reference.\n");
8436 spin_unlock(&pers_lock);
8439 spin_unlock(&pers_lock);
8441 ret = md_cluster_ops->join(mddev, nodes);
8443 mddev->safemode_delay = 0;
8447 void md_cluster_stop(struct mddev *mddev)
8449 if (!md_cluster_ops)
8451 md_cluster_ops->leave(mddev);
8452 module_put(md_cluster_mod);
8455 static int is_mddev_idle(struct mddev *mddev, int init)
8457 struct md_rdev *rdev;
8463 rdev_for_each_rcu(rdev, mddev) {
8464 struct gendisk *disk = rdev->bdev->bd_disk;
8465 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8466 atomic_read(&disk->sync_io);
8467 /* sync IO will cause sync_io to increase before the disk_stats
8468 * as sync_io is counted when a request starts, and
8469 * disk_stats is counted when it completes.
8470 * So resync activity will cause curr_events to be smaller than
8471 * when there was no such activity.
8472 * non-sync IO will cause disk_stat to increase without
8473 * increasing sync_io so curr_events will (eventually)
8474 * be larger than it was before. Once it becomes
8475 * substantially larger, the test below will cause
8476 * the array to appear non-idle, and resync will slow
8478 * If there is a lot of outstanding resync activity when
8479 * we set last_event to curr_events, then all that activity
8480 * completing might cause the array to appear non-idle
8481 * and resync will be slowed down even though there might
8482 * not have been non-resync activity. This will only
8483 * happen once though. 'last_events' will soon reflect
8484 * the state where there is little or no outstanding
8485 * resync requests, and further resync activity will
8486 * always make curr_events less than last_events.
8489 if (init || curr_events - rdev->last_events > 64) {
8490 rdev->last_events = curr_events;
8498 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8500 /* another "blocks" (512byte) blocks have been synced */
8501 atomic_sub(blocks, &mddev->recovery_active);
8502 wake_up(&mddev->recovery_wait);
8504 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8505 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8506 md_wakeup_thread(mddev->thread);
8507 // stop recovery, signal do_sync ....
8510 EXPORT_SYMBOL(md_done_sync);
8512 /* md_write_start(mddev, bi)
8513 * If we need to update some array metadata (e.g. 'active' flag
8514 * in superblock) before writing, schedule a superblock update
8515 * and wait for it to complete.
8516 * A return value of 'false' means that the write wasn't recorded
8517 * and cannot proceed as the array is being suspend.
8519 bool md_write_start(struct mddev *mddev, struct bio *bi)
8523 if (bio_data_dir(bi) != WRITE)
8526 BUG_ON(mddev->ro == MD_RDONLY);
8527 if (mddev->ro == MD_AUTO_READ) {
8528 /* need to switch to read/write */
8529 mddev->ro = MD_RDWR;
8530 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8531 md_wakeup_thread(mddev->thread);
8532 md_wakeup_thread(mddev->sync_thread);
8536 percpu_ref_get(&mddev->writes_pending);
8537 smp_mb(); /* Match smp_mb in set_in_sync() */
8538 if (mddev->safemode == 1)
8539 mddev->safemode = 0;
8540 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8541 if (mddev->in_sync || mddev->sync_checkers) {
8542 spin_lock(&mddev->lock);
8543 if (mddev->in_sync) {
8545 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8546 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8547 md_wakeup_thread(mddev->thread);
8550 spin_unlock(&mddev->lock);
8554 sysfs_notify_dirent_safe(mddev->sysfs_state);
8555 if (!mddev->has_superblocks)
8557 wait_event(mddev->sb_wait,
8558 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8559 is_md_suspended(mddev));
8560 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8561 percpu_ref_put(&mddev->writes_pending);
8566 EXPORT_SYMBOL(md_write_start);
8568 /* md_write_inc can only be called when md_write_start() has
8569 * already been called at least once of the current request.
8570 * It increments the counter and is useful when a single request
8571 * is split into several parts. Each part causes an increment and
8572 * so needs a matching md_write_end().
8573 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8574 * a spinlocked region.
8576 void md_write_inc(struct mddev *mddev, struct bio *bi)
8578 if (bio_data_dir(bi) != WRITE)
8580 WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
8581 percpu_ref_get(&mddev->writes_pending);
8583 EXPORT_SYMBOL(md_write_inc);
8585 void md_write_end(struct mddev *mddev)
8587 percpu_ref_put(&mddev->writes_pending);
8589 if (mddev->safemode == 2)
8590 md_wakeup_thread(mddev->thread);
8591 else if (mddev->safemode_delay)
8592 /* The roundup() ensures this only performs locking once
8593 * every ->safemode_delay jiffies
8595 mod_timer(&mddev->safemode_timer,
8596 roundup(jiffies, mddev->safemode_delay) +
8597 mddev->safemode_delay);
8600 EXPORT_SYMBOL(md_write_end);
8602 /* This is used by raid0 and raid10 */
8603 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8604 struct bio *bio, sector_t start, sector_t size)
8606 struct bio *discard_bio = NULL;
8608 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8609 &discard_bio) || !discard_bio)
8612 bio_chain(discard_bio, bio);
8613 bio_clone_blkg_association(discard_bio, bio);
8615 trace_block_bio_remap(discard_bio,
8616 disk_devt(mddev->gendisk),
8617 bio->bi_iter.bi_sector);
8618 submit_bio_noacct(discard_bio);
8620 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8622 int acct_bioset_init(struct mddev *mddev)
8626 if (!bioset_initialized(&mddev->io_acct_set))
8627 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
8628 offsetof(struct md_io_acct, bio_clone), 0);
8631 EXPORT_SYMBOL_GPL(acct_bioset_init);
8633 void acct_bioset_exit(struct mddev *mddev)
8635 bioset_exit(&mddev->io_acct_set);
8637 EXPORT_SYMBOL_GPL(acct_bioset_exit);
8639 static void md_end_io_acct(struct bio *bio)
8641 struct md_io_acct *md_io_acct = bio->bi_private;
8642 struct bio *orig_bio = md_io_acct->orig_bio;
8643 struct mddev *mddev = md_io_acct->mddev;
8645 orig_bio->bi_status = bio->bi_status;
8647 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8649 bio_endio(orig_bio);
8651 percpu_ref_put(&mddev->active_io);
8655 * Used by personalities that don't already clone the bio and thus can't
8656 * easily add the timestamp to their extended bio structure.
8658 void md_account_bio(struct mddev *mddev, struct bio **bio)
8660 struct block_device *bdev = (*bio)->bi_bdev;
8661 struct md_io_acct *md_io_acct;
8664 if (!blk_queue_io_stat(bdev->bd_disk->queue))
8667 percpu_ref_get(&mddev->active_io);
8669 clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set);
8670 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8671 md_io_acct->orig_bio = *bio;
8672 md_io_acct->start_time = bio_start_io_acct(*bio);
8673 md_io_acct->mddev = mddev;
8675 clone->bi_end_io = md_end_io_acct;
8676 clone->bi_private = md_io_acct;
8679 EXPORT_SYMBOL_GPL(md_account_bio);
8681 /* md_allow_write(mddev)
8682 * Calling this ensures that the array is marked 'active' so that writes
8683 * may proceed without blocking. It is important to call this before
8684 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8685 * Must be called with mddev_lock held.
8687 void md_allow_write(struct mddev *mddev)
8691 if (!md_is_rdwr(mddev))
8693 if (!mddev->pers->sync_request)
8696 spin_lock(&mddev->lock);
8697 if (mddev->in_sync) {
8699 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8700 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8701 if (mddev->safemode_delay &&
8702 mddev->safemode == 0)
8703 mddev->safemode = 1;
8704 spin_unlock(&mddev->lock);
8705 md_update_sb(mddev, 0);
8706 sysfs_notify_dirent_safe(mddev->sysfs_state);
8707 /* wait for the dirty state to be recorded in the metadata */
8708 wait_event(mddev->sb_wait,
8709 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8711 spin_unlock(&mddev->lock);
8713 EXPORT_SYMBOL_GPL(md_allow_write);
8715 #define SYNC_MARKS 10
8716 #define SYNC_MARK_STEP (3*HZ)
8717 #define UPDATE_FREQUENCY (5*60*HZ)
8718 void md_do_sync(struct md_thread *thread)
8720 struct mddev *mddev = thread->mddev;
8721 struct mddev *mddev2;
8722 unsigned int currspeed = 0, window;
8723 sector_t max_sectors,j, io_sectors, recovery_done;
8724 unsigned long mark[SYNC_MARKS];
8725 unsigned long update_time;
8726 sector_t mark_cnt[SYNC_MARKS];
8728 sector_t last_check;
8730 struct md_rdev *rdev;
8731 char *desc, *action = NULL;
8732 struct blk_plug plug;
8735 /* just incase thread restarts... */
8736 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8737 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8739 if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
8740 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8744 if (mddev_is_clustered(mddev)) {
8745 ret = md_cluster_ops->resync_start(mddev);
8749 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8750 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8751 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8752 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8753 && ((unsigned long long)mddev->curr_resync_completed
8754 < (unsigned long long)mddev->resync_max_sectors))
8758 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8759 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8760 desc = "data-check";
8762 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8763 desc = "requested-resync";
8767 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8772 mddev->last_sync_action = action ?: desc;
8775 * Before starting a resync we must have set curr_resync to
8776 * 2, and then checked that every "conflicting" array has curr_resync
8777 * less than ours. When we find one that is the same or higher
8778 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8779 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8780 * This will mean we have to start checking from the beginning again.
8785 int mddev2_minor = -1;
8786 mddev->curr_resync = MD_RESYNC_DELAYED;
8789 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8791 spin_lock(&all_mddevs_lock);
8792 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) {
8793 if (test_bit(MD_DELETED, &mddev2->flags))
8795 if (mddev2 == mddev)
8797 if (!mddev->parallel_resync
8798 && mddev2->curr_resync
8799 && match_mddev_units(mddev, mddev2)) {
8801 if (mddev < mddev2 &&
8802 mddev->curr_resync == MD_RESYNC_DELAYED) {
8803 /* arbitrarily yield */
8804 mddev->curr_resync = MD_RESYNC_YIELDED;
8805 wake_up(&resync_wait);
8807 if (mddev > mddev2 &&
8808 mddev->curr_resync == MD_RESYNC_YIELDED)
8809 /* no need to wait here, we can wait the next
8810 * time 'round when curr_resync == 2
8813 /* We need to wait 'interruptible' so as not to
8814 * contribute to the load average, and not to
8815 * be caught by 'softlockup'
8817 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8818 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8819 mddev2->curr_resync >= mddev->curr_resync) {
8820 if (mddev2_minor != mddev2->md_minor) {
8821 mddev2_minor = mddev2->md_minor;
8822 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8823 desc, mdname(mddev),
8826 spin_unlock(&all_mddevs_lock);
8828 if (signal_pending(current))
8829 flush_signals(current);
8831 finish_wait(&resync_wait, &wq);
8834 finish_wait(&resync_wait, &wq);
8837 spin_unlock(&all_mddevs_lock);
8838 } while (mddev->curr_resync < MD_RESYNC_DELAYED);
8841 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8842 /* resync follows the size requested by the personality,
8843 * which defaults to physical size, but can be virtual size
8845 max_sectors = mddev->resync_max_sectors;
8846 atomic64_set(&mddev->resync_mismatches, 0);
8847 /* we don't use the checkpoint if there's a bitmap */
8848 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8849 j = mddev->resync_min;
8850 else if (!mddev->bitmap)
8851 j = mddev->recovery_cp;
8853 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8854 max_sectors = mddev->resync_max_sectors;
8856 * If the original node aborts reshaping then we continue the
8857 * reshaping, so set j again to avoid restart reshape from the
8860 if (mddev_is_clustered(mddev) &&
8861 mddev->reshape_position != MaxSector)
8862 j = mddev->reshape_position;
8864 /* recovery follows the physical size of devices */
8865 max_sectors = mddev->dev_sectors;
8868 rdev_for_each_rcu(rdev, mddev)
8869 if (rdev->raid_disk >= 0 &&
8870 !test_bit(Journal, &rdev->flags) &&
8871 !test_bit(Faulty, &rdev->flags) &&
8872 !test_bit(In_sync, &rdev->flags) &&
8873 rdev->recovery_offset < j)
8874 j = rdev->recovery_offset;
8877 /* If there is a bitmap, we need to make sure all
8878 * writes that started before we added a spare
8879 * complete before we start doing a recovery.
8880 * Otherwise the write might complete and (via
8881 * bitmap_endwrite) set a bit in the bitmap after the
8882 * recovery has checked that bit and skipped that
8885 if (mddev->bitmap) {
8886 mddev->pers->quiesce(mddev, 1);
8887 mddev->pers->quiesce(mddev, 0);
8891 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8892 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8893 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8894 speed_max(mddev), desc);
8896 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8899 for (m = 0; m < SYNC_MARKS; m++) {
8901 mark_cnt[m] = io_sectors;
8904 mddev->resync_mark = mark[last_mark];
8905 mddev->resync_mark_cnt = mark_cnt[last_mark];
8908 * Tune reconstruction:
8910 window = 32 * (PAGE_SIZE / 512);
8911 pr_debug("md: using %dk window, over a total of %lluk.\n",
8912 window/2, (unsigned long long)max_sectors/2);
8914 atomic_set(&mddev->recovery_active, 0);
8917 if (j >= MD_RESYNC_ACTIVE) {
8918 pr_debug("md: resuming %s of %s from checkpoint.\n",
8919 desc, mdname(mddev));
8920 mddev->curr_resync = j;
8922 mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */
8923 mddev->curr_resync_completed = j;
8924 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8926 update_time = jiffies;
8928 blk_start_plug(&plug);
8929 while (j < max_sectors) {
8934 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8935 ((mddev->curr_resync > mddev->curr_resync_completed &&
8936 (mddev->curr_resync - mddev->curr_resync_completed)
8937 > (max_sectors >> 4)) ||
8938 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8939 (j - mddev->curr_resync_completed)*2
8940 >= mddev->resync_max - mddev->curr_resync_completed ||
8941 mddev->curr_resync_completed > mddev->resync_max
8943 /* time to update curr_resync_completed */
8944 wait_event(mddev->recovery_wait,
8945 atomic_read(&mddev->recovery_active) == 0);
8946 mddev->curr_resync_completed = j;
8947 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8948 j > mddev->recovery_cp)
8949 mddev->recovery_cp = j;
8950 update_time = jiffies;
8951 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8952 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8955 while (j >= mddev->resync_max &&
8956 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8957 /* As this condition is controlled by user-space,
8958 * we can block indefinitely, so use '_interruptible'
8959 * to avoid triggering warnings.
8961 flush_signals(current); /* just in case */
8962 wait_event_interruptible(mddev->recovery_wait,
8963 mddev->resync_max > j
8964 || test_bit(MD_RECOVERY_INTR,
8968 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8971 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8973 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8977 if (!skipped) { /* actual IO requested */
8978 io_sectors += sectors;
8979 atomic_add(sectors, &mddev->recovery_active);
8982 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8986 if (j > max_sectors)
8987 /* when skipping, extra large numbers can be returned. */
8989 if (j >= MD_RESYNC_ACTIVE)
8990 mddev->curr_resync = j;
8991 mddev->curr_mark_cnt = io_sectors;
8992 if (last_check == 0)
8993 /* this is the earliest that rebuild will be
8994 * visible in /proc/mdstat
8998 if (last_check + window > io_sectors || j == max_sectors)
9001 last_check = io_sectors;
9003 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
9005 int next = (last_mark+1) % SYNC_MARKS;
9007 mddev->resync_mark = mark[next];
9008 mddev->resync_mark_cnt = mark_cnt[next];
9009 mark[next] = jiffies;
9010 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
9014 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9018 * this loop exits only if either when we are slower than
9019 * the 'hard' speed limit, or the system was IO-idle for
9021 * the system might be non-idle CPU-wise, but we only care
9022 * about not overloading the IO subsystem. (things like an
9023 * e2fsck being done on the RAID array should execute fast)
9027 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9028 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9029 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9031 if (currspeed > speed_min(mddev)) {
9032 if (currspeed > speed_max(mddev)) {
9036 if (!is_mddev_idle(mddev, 0)) {
9038 * Give other IO more of a chance.
9039 * The faster the devices, the less we wait.
9041 wait_event(mddev->recovery_wait,
9042 !atomic_read(&mddev->recovery_active));
9046 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9047 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9048 ? "interrupted" : "done");
9050 * this also signals 'finished resyncing' to md_stop
9052 blk_finish_plug(&plug);
9053 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9055 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9056 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9057 mddev->curr_resync >= MD_RESYNC_ACTIVE) {
9058 mddev->curr_resync_completed = mddev->curr_resync;
9059 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9061 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9063 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9064 mddev->curr_resync > MD_RESYNC_ACTIVE) {
9065 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9066 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9067 if (mddev->curr_resync >= mddev->recovery_cp) {
9068 pr_debug("md: checkpointing %s of %s.\n",
9069 desc, mdname(mddev));
9070 if (test_bit(MD_RECOVERY_ERROR,
9072 mddev->recovery_cp =
9073 mddev->curr_resync_completed;
9075 mddev->recovery_cp =
9079 mddev->recovery_cp = MaxSector;
9081 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9082 mddev->curr_resync = MaxSector;
9083 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9084 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9086 rdev_for_each_rcu(rdev, mddev)
9087 if (rdev->raid_disk >= 0 &&
9088 mddev->delta_disks >= 0 &&
9089 !test_bit(Journal, &rdev->flags) &&
9090 !test_bit(Faulty, &rdev->flags) &&
9091 !test_bit(In_sync, &rdev->flags) &&
9092 rdev->recovery_offset < mddev->curr_resync)
9093 rdev->recovery_offset = mddev->curr_resync;
9099 /* set CHANGE_PENDING here since maybe another update is needed,
9100 * so other nodes are informed. It should be harmless for normal
9102 set_mask_bits(&mddev->sb_flags, 0,
9103 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9105 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9106 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9107 mddev->delta_disks > 0 &&
9108 mddev->pers->finish_reshape &&
9109 mddev->pers->size &&
9111 mddev_lock_nointr(mddev);
9112 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9113 mddev_unlock(mddev);
9114 if (!mddev_is_clustered(mddev))
9115 set_capacity_and_notify(mddev->gendisk,
9116 mddev->array_sectors);
9119 spin_lock(&mddev->lock);
9120 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9121 /* We completed so min/max setting can be forgotten if used. */
9122 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9123 mddev->resync_min = 0;
9124 mddev->resync_max = MaxSector;
9125 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9126 mddev->resync_min = mddev->curr_resync_completed;
9127 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9128 mddev->curr_resync = MD_RESYNC_NONE;
9129 spin_unlock(&mddev->lock);
9131 wake_up(&resync_wait);
9132 wake_up(&mddev->sb_wait);
9133 md_wakeup_thread(mddev->thread);
9136 EXPORT_SYMBOL_GPL(md_do_sync);
9138 static int remove_and_add_spares(struct mddev *mddev,
9139 struct md_rdev *this)
9141 struct md_rdev *rdev;
9144 bool remove_some = false;
9146 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9147 /* Mustn't remove devices when resync thread is running */
9150 rdev_for_each(rdev, mddev) {
9151 if ((this == NULL || rdev == this) &&
9152 rdev->raid_disk >= 0 &&
9153 !test_bit(Blocked, &rdev->flags) &&
9154 test_bit(Faulty, &rdev->flags) &&
9155 atomic_read(&rdev->nr_pending)==0) {
9156 /* Faulty non-Blocked devices with nr_pending == 0
9157 * never get nr_pending incremented,
9158 * never get Faulty cleared, and never get Blocked set.
9159 * So we can synchronize_rcu now rather than once per device
9162 set_bit(RemoveSynchronized, &rdev->flags);
9168 rdev_for_each(rdev, mddev) {
9169 if ((this == NULL || rdev == this) &&
9170 rdev->raid_disk >= 0 &&
9171 !test_bit(Blocked, &rdev->flags) &&
9172 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9173 (!test_bit(In_sync, &rdev->flags) &&
9174 !test_bit(Journal, &rdev->flags))) &&
9175 atomic_read(&rdev->nr_pending)==0)) {
9176 if (mddev->pers->hot_remove_disk(
9177 mddev, rdev) == 0) {
9178 sysfs_unlink_rdev(mddev, rdev);
9179 rdev->saved_raid_disk = rdev->raid_disk;
9180 rdev->raid_disk = -1;
9184 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9185 clear_bit(RemoveSynchronized, &rdev->flags);
9188 if (removed && mddev->kobj.sd)
9189 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9191 if (this && removed)
9194 rdev_for_each(rdev, mddev) {
9195 if (this && this != rdev)
9197 if (test_bit(Candidate, &rdev->flags))
9199 if (rdev->raid_disk >= 0 &&
9200 !test_bit(In_sync, &rdev->flags) &&
9201 !test_bit(Journal, &rdev->flags) &&
9202 !test_bit(Faulty, &rdev->flags))
9204 if (rdev->raid_disk >= 0)
9206 if (test_bit(Faulty, &rdev->flags))
9208 if (!test_bit(Journal, &rdev->flags)) {
9209 if (!md_is_rdwr(mddev) &&
9210 !(rdev->saved_raid_disk >= 0 &&
9211 !test_bit(Bitmap_sync, &rdev->flags)))
9214 rdev->recovery_offset = 0;
9216 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9217 /* failure here is OK */
9218 sysfs_link_rdev(mddev, rdev);
9219 if (!test_bit(Journal, &rdev->flags))
9222 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9227 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9231 static void md_start_sync(struct work_struct *ws)
9233 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9235 rcu_assign_pointer(mddev->sync_thread,
9236 md_register_thread(md_do_sync, mddev, "resync"));
9237 if (!mddev->sync_thread) {
9238 pr_warn("%s: could not start resync thread...\n",
9240 /* leave the spares where they are, it shouldn't hurt */
9241 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9242 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9243 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9244 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9245 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9246 wake_up(&resync_wait);
9247 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9249 if (mddev->sysfs_action)
9250 sysfs_notify_dirent_safe(mddev->sysfs_action);
9252 md_wakeup_thread(mddev->sync_thread);
9253 sysfs_notify_dirent_safe(mddev->sysfs_action);
9258 * This routine is regularly called by all per-raid-array threads to
9259 * deal with generic issues like resync and super-block update.
9260 * Raid personalities that don't have a thread (linear/raid0) do not
9261 * need this as they never do any recovery or update the superblock.
9263 * It does not do any resync itself, but rather "forks" off other threads
9264 * to do that as needed.
9265 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9266 * "->recovery" and create a thread at ->sync_thread.
9267 * When the thread finishes it sets MD_RECOVERY_DONE
9268 * and wakeups up this thread which will reap the thread and finish up.
9269 * This thread also removes any faulty devices (with nr_pending == 0).
9271 * The overall approach is:
9272 * 1/ if the superblock needs updating, update it.
9273 * 2/ If a recovery thread is running, don't do anything else.
9274 * 3/ If recovery has finished, clean up, possibly marking spares active.
9275 * 4/ If there are any faulty devices, remove them.
9276 * 5/ If array is degraded, try to add spares devices
9277 * 6/ If array has spares or is not in-sync, start a resync thread.
9279 void md_check_recovery(struct mddev *mddev)
9281 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9282 /* Write superblock - thread that called mddev_suspend()
9283 * holds reconfig_mutex for us.
9285 set_bit(MD_UPDATING_SB, &mddev->flags);
9286 smp_mb__after_atomic();
9287 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9288 md_update_sb(mddev, 0);
9289 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9290 wake_up(&mddev->sb_wait);
9293 if (is_md_suspended(mddev))
9297 md_bitmap_daemon_work(mddev);
9299 if (signal_pending(current)) {
9300 if (mddev->pers->sync_request && !mddev->external) {
9301 pr_debug("md: %s in immediate safe mode\n",
9303 mddev->safemode = 2;
9305 flush_signals(current);
9308 if (!md_is_rdwr(mddev) &&
9309 !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9312 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9313 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9314 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9315 (mddev->external == 0 && mddev->safemode == 1) ||
9316 (mddev->safemode == 2
9317 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9321 if (mddev_trylock(mddev)) {
9323 bool try_set_sync = mddev->safemode != 0;
9325 if (!mddev->external && mddev->safemode == 1)
9326 mddev->safemode = 0;
9328 if (!md_is_rdwr(mddev)) {
9329 struct md_rdev *rdev;
9330 if (!mddev->external && mddev->in_sync)
9331 /* 'Blocked' flag not needed as failed devices
9332 * will be recorded if array switched to read/write.
9333 * Leaving it set will prevent the device
9334 * from being removed.
9336 rdev_for_each(rdev, mddev)
9337 clear_bit(Blocked, &rdev->flags);
9338 /* On a read-only array we can:
9339 * - remove failed devices
9340 * - add already-in_sync devices if the array itself
9342 * As we only add devices that are already in-sync,
9343 * we can activate the spares immediately.
9345 remove_and_add_spares(mddev, NULL);
9346 /* There is no thread, but we need to call
9347 * ->spare_active and clear saved_raid_disk
9349 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9350 md_reap_sync_thread(mddev);
9351 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9352 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9353 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9357 if (mddev_is_clustered(mddev)) {
9358 struct md_rdev *rdev, *tmp;
9359 /* kick the device if another node issued a
9362 rdev_for_each_safe(rdev, tmp, mddev) {
9363 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9364 rdev->raid_disk < 0)
9365 md_kick_rdev_from_array(rdev);
9369 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9370 spin_lock(&mddev->lock);
9372 spin_unlock(&mddev->lock);
9375 if (mddev->sb_flags)
9376 md_update_sb(mddev, 0);
9378 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9379 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9380 /* resync/recovery still happening */
9381 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9384 if (mddev->sync_thread) {
9385 md_reap_sync_thread(mddev);
9388 /* Set RUNNING before clearing NEEDED to avoid
9389 * any transients in the value of "sync_action".
9391 mddev->curr_resync_completed = 0;
9392 spin_lock(&mddev->lock);
9393 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9394 spin_unlock(&mddev->lock);
9395 /* Clear some bits that don't mean anything, but
9398 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9399 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9401 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9402 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9404 /* no recovery is running.
9405 * remove any failed drives, then
9406 * add spares if possible.
9407 * Spares are also removed and re-added, to allow
9408 * the personality to fail the re-add.
9411 if (mddev->reshape_position != MaxSector) {
9412 if (mddev->pers->check_reshape == NULL ||
9413 mddev->pers->check_reshape(mddev) != 0)
9414 /* Cannot proceed */
9416 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9417 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9418 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9419 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9420 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9421 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9422 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9423 } else if (mddev->recovery_cp < MaxSector) {
9424 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9425 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9426 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9427 /* nothing to be done ... */
9430 if (mddev->pers->sync_request) {
9432 /* We are adding a device or devices to an array
9433 * which has the bitmap stored on all devices.
9434 * So make sure all bitmap pages get written
9436 md_bitmap_write_all(mddev->bitmap);
9438 INIT_WORK(&mddev->del_work, md_start_sync);
9439 queue_work(md_misc_wq, &mddev->del_work);
9443 if (!mddev->sync_thread) {
9444 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9445 wake_up(&resync_wait);
9446 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9448 if (mddev->sysfs_action)
9449 sysfs_notify_dirent_safe(mddev->sysfs_action);
9452 wake_up(&mddev->sb_wait);
9453 mddev_unlock(mddev);
9456 EXPORT_SYMBOL(md_check_recovery);
9458 void md_reap_sync_thread(struct mddev *mddev)
9460 struct md_rdev *rdev;
9461 sector_t old_dev_sectors = mddev->dev_sectors;
9462 bool is_reshaped = false;
9464 /* resync has finished, collect result */
9465 md_unregister_thread(&mddev->sync_thread);
9466 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9467 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9468 mddev->degraded != mddev->raid_disks) {
9470 /* activate any spares */
9471 if (mddev->pers->spare_active(mddev)) {
9472 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9473 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9476 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9477 mddev->pers->finish_reshape) {
9478 mddev->pers->finish_reshape(mddev);
9479 if (mddev_is_clustered(mddev))
9483 /* If array is no-longer degraded, then any saved_raid_disk
9484 * information must be scrapped.
9486 if (!mddev->degraded)
9487 rdev_for_each(rdev, mddev)
9488 rdev->saved_raid_disk = -1;
9490 md_update_sb(mddev, 1);
9491 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9492 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9494 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9495 md_cluster_ops->resync_finish(mddev);
9496 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9497 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9498 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9499 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9500 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9501 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9503 * We call md_cluster_ops->update_size here because sync_size could
9504 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9505 * so it is time to update size across cluster.
9507 if (mddev_is_clustered(mddev) && is_reshaped
9508 && !test_bit(MD_CLOSING, &mddev->flags))
9509 md_cluster_ops->update_size(mddev, old_dev_sectors);
9510 wake_up(&resync_wait);
9511 /* flag recovery needed just to double check */
9512 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9513 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9514 sysfs_notify_dirent_safe(mddev->sysfs_action);
9516 if (mddev->event_work.func)
9517 queue_work(md_misc_wq, &mddev->event_work);
9519 EXPORT_SYMBOL(md_reap_sync_thread);
9521 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9523 sysfs_notify_dirent_safe(rdev->sysfs_state);
9524 wait_event_timeout(rdev->blocked_wait,
9525 !test_bit(Blocked, &rdev->flags) &&
9526 !test_bit(BlockedBadBlocks, &rdev->flags),
9527 msecs_to_jiffies(5000));
9528 rdev_dec_pending(rdev, mddev);
9530 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9532 void md_finish_reshape(struct mddev *mddev)
9534 /* called be personality module when reshape completes. */
9535 struct md_rdev *rdev;
9537 rdev_for_each(rdev, mddev) {
9538 if (rdev->data_offset > rdev->new_data_offset)
9539 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9541 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9542 rdev->data_offset = rdev->new_data_offset;
9545 EXPORT_SYMBOL(md_finish_reshape);
9547 /* Bad block management */
9549 /* Returns 1 on success, 0 on failure */
9550 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9553 struct mddev *mddev = rdev->mddev;
9556 s += rdev->new_data_offset;
9558 s += rdev->data_offset;
9559 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9561 /* Make sure they get written out promptly */
9562 if (test_bit(ExternalBbl, &rdev->flags))
9563 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9564 sysfs_notify_dirent_safe(rdev->sysfs_state);
9565 set_mask_bits(&mddev->sb_flags, 0,
9566 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9567 md_wakeup_thread(rdev->mddev->thread);
9572 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9574 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9579 s += rdev->new_data_offset;
9581 s += rdev->data_offset;
9582 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9583 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9584 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9587 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9589 static int md_notify_reboot(struct notifier_block *this,
9590 unsigned long code, void *x)
9592 struct mddev *mddev, *n;
9595 spin_lock(&all_mddevs_lock);
9596 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9597 if (!mddev_get(mddev))
9599 spin_unlock(&all_mddevs_lock);
9600 if (mddev_trylock(mddev)) {
9602 __md_stop_writes(mddev);
9603 if (mddev->persistent)
9604 mddev->safemode = 2;
9605 mddev_unlock(mddev);
9609 spin_lock(&all_mddevs_lock);
9611 spin_unlock(&all_mddevs_lock);
9614 * certain more exotic SCSI devices are known to be
9615 * volatile wrt too early system reboots. While the
9616 * right place to handle this issue is the given
9617 * driver, we do want to have a safe RAID driver ...
9625 static struct notifier_block md_notifier = {
9626 .notifier_call = md_notify_reboot,
9628 .priority = INT_MAX, /* before any real devices */
9631 static void md_geninit(void)
9633 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9635 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9638 static int __init md_init(void)
9642 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9646 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9650 md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND,
9655 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9659 ret = __register_blkdev(0, "mdp", md_probe);
9664 register_reboot_notifier(&md_notifier);
9665 raid_table_header = register_sysctl("dev/raid", raid_table);
9671 unregister_blkdev(MD_MAJOR, "md");
9673 destroy_workqueue(md_bitmap_wq);
9675 destroy_workqueue(md_misc_wq);
9677 destroy_workqueue(md_wq);
9682 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9684 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9685 struct md_rdev *rdev2, *tmp;
9689 * If size is changed in another node then we need to
9690 * do resize as well.
9692 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9693 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9695 pr_info("md-cluster: resize failed\n");
9697 md_bitmap_update_sb(mddev->bitmap);
9700 /* Check for change of roles in the active devices */
9701 rdev_for_each_safe(rdev2, tmp, mddev) {
9702 if (test_bit(Faulty, &rdev2->flags))
9705 /* Check if the roles changed */
9706 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9708 if (test_bit(Candidate, &rdev2->flags)) {
9709 if (role == MD_DISK_ROLE_FAULTY) {
9710 pr_info("md: Removing Candidate device %pg because add failed\n",
9712 md_kick_rdev_from_array(rdev2);
9716 clear_bit(Candidate, &rdev2->flags);
9719 if (role != rdev2->raid_disk) {
9721 * got activated except reshape is happening.
9723 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9724 !(le32_to_cpu(sb->feature_map) &
9725 MD_FEATURE_RESHAPE_ACTIVE)) {
9726 rdev2->saved_raid_disk = role;
9727 ret = remove_and_add_spares(mddev, rdev2);
9728 pr_info("Activated spare: %pg\n",
9730 /* wakeup mddev->thread here, so array could
9731 * perform resync with the new activated disk */
9732 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9733 md_wakeup_thread(mddev->thread);
9736 * We just want to do the minimum to mark the disk
9737 * as faulty. The recovery is performed by the
9738 * one who initiated the error.
9740 if (role == MD_DISK_ROLE_FAULTY ||
9741 role == MD_DISK_ROLE_JOURNAL) {
9742 md_error(mddev, rdev2);
9743 clear_bit(Blocked, &rdev2->flags);
9748 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9749 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9751 pr_warn("md: updating array disks failed. %d\n", ret);
9755 * Since mddev->delta_disks has already updated in update_raid_disks,
9756 * so it is time to check reshape.
9758 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9759 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9761 * reshape is happening in the remote node, we need to
9762 * update reshape_position and call start_reshape.
9764 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9765 if (mddev->pers->update_reshape_pos)
9766 mddev->pers->update_reshape_pos(mddev);
9767 if (mddev->pers->start_reshape)
9768 mddev->pers->start_reshape(mddev);
9769 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9770 mddev->reshape_position != MaxSector &&
9771 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9772 /* reshape is just done in another node. */
9773 mddev->reshape_position = MaxSector;
9774 if (mddev->pers->update_reshape_pos)
9775 mddev->pers->update_reshape_pos(mddev);
9778 /* Finally set the event to be up to date */
9779 mddev->events = le64_to_cpu(sb->events);
9782 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9785 struct page *swapout = rdev->sb_page;
9786 struct mdp_superblock_1 *sb;
9788 /* Store the sb page of the rdev in the swapout temporary
9789 * variable in case we err in the future
9791 rdev->sb_page = NULL;
9792 err = alloc_disk_sb(rdev);
9794 ClearPageUptodate(rdev->sb_page);
9795 rdev->sb_loaded = 0;
9796 err = super_types[mddev->major_version].
9797 load_super(rdev, NULL, mddev->minor_version);
9800 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9801 __func__, __LINE__, rdev->desc_nr, err);
9803 put_page(rdev->sb_page);
9804 rdev->sb_page = swapout;
9805 rdev->sb_loaded = 1;
9809 sb = page_address(rdev->sb_page);
9810 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9814 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9815 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9817 /* The other node finished recovery, call spare_active to set
9818 * device In_sync and mddev->degraded
9820 if (rdev->recovery_offset == MaxSector &&
9821 !test_bit(In_sync, &rdev->flags) &&
9822 mddev->pers->spare_active(mddev))
9823 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9829 void md_reload_sb(struct mddev *mddev, int nr)
9831 struct md_rdev *rdev = NULL, *iter;
9835 rdev_for_each_rcu(iter, mddev) {
9836 if (iter->desc_nr == nr) {
9843 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9847 err = read_rdev(mddev, rdev);
9851 check_sb_changes(mddev, rdev);
9853 /* Read all rdev's to update recovery_offset */
9854 rdev_for_each_rcu(rdev, mddev) {
9855 if (!test_bit(Faulty, &rdev->flags))
9856 read_rdev(mddev, rdev);
9859 EXPORT_SYMBOL(md_reload_sb);
9864 * Searches all registered partitions for autorun RAID arrays
9868 static DEFINE_MUTEX(detected_devices_mutex);
9869 static LIST_HEAD(all_detected_devices);
9870 struct detected_devices_node {
9871 struct list_head list;
9875 void md_autodetect_dev(dev_t dev)
9877 struct detected_devices_node *node_detected_dev;
9879 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9880 if (node_detected_dev) {
9881 node_detected_dev->dev = dev;
9882 mutex_lock(&detected_devices_mutex);
9883 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9884 mutex_unlock(&detected_devices_mutex);
9888 void md_autostart_arrays(int part)
9890 struct md_rdev *rdev;
9891 struct detected_devices_node *node_detected_dev;
9893 int i_scanned, i_passed;
9898 pr_info("md: Autodetecting RAID arrays.\n");
9900 mutex_lock(&detected_devices_mutex);
9901 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9903 node_detected_dev = list_entry(all_detected_devices.next,
9904 struct detected_devices_node, list);
9905 list_del(&node_detected_dev->list);
9906 dev = node_detected_dev->dev;
9907 kfree(node_detected_dev);
9908 mutex_unlock(&detected_devices_mutex);
9909 rdev = md_import_device(dev,0, 90);
9910 mutex_lock(&detected_devices_mutex);
9914 if (test_bit(Faulty, &rdev->flags))
9917 set_bit(AutoDetected, &rdev->flags);
9918 list_add(&rdev->same_set, &pending_raid_disks);
9921 mutex_unlock(&detected_devices_mutex);
9923 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9925 autorun_devices(part);
9928 #endif /* !MODULE */
9930 static __exit void md_exit(void)
9932 struct mddev *mddev, *n;
9935 unregister_blkdev(MD_MAJOR,"md");
9936 unregister_blkdev(mdp_major, "mdp");
9937 unregister_reboot_notifier(&md_notifier);
9938 unregister_sysctl_table(raid_table_header);
9940 /* We cannot unload the modules while some process is
9941 * waiting for us in select() or poll() - wake them up
9944 while (waitqueue_active(&md_event_waiters)) {
9945 /* not safe to leave yet */
9946 wake_up(&md_event_waiters);
9950 remove_proc_entry("mdstat", NULL);
9952 spin_lock(&all_mddevs_lock);
9953 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9954 if (!mddev_get(mddev))
9956 spin_unlock(&all_mddevs_lock);
9957 export_array(mddev);
9959 mddev->hold_active = 0;
9961 * As the mddev is now fully clear, mddev_put will schedule
9962 * the mddev for destruction by a workqueue, and the
9963 * destroy_workqueue() below will wait for that to complete.
9966 spin_lock(&all_mddevs_lock);
9968 spin_unlock(&all_mddevs_lock);
9970 destroy_workqueue(md_misc_wq);
9971 destroy_workqueue(md_bitmap_wq);
9972 destroy_workqueue(md_wq);
9975 subsys_initcall(md_init);
9976 module_exit(md_exit)
9978 static int get_ro(char *buffer, const struct kernel_param *kp)
9980 return sprintf(buffer, "%d\n", start_readonly);
9982 static int set_ro(const char *val, const struct kernel_param *kp)
9984 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9987 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9988 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9989 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9990 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9992 MODULE_LICENSE("GPL");
9993 MODULE_DESCRIPTION("MD RAID framework");
9995 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);