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
75 * pers_lock does extra service to protect accesses to
76 * mddev->thread when the mutex cannot be held.
78 static LIST_HEAD(pers_list);
79 static DEFINE_SPINLOCK(pers_lock);
81 static struct kobj_type md_ktype;
83 struct md_cluster_operations *md_cluster_ops;
84 EXPORT_SYMBOL(md_cluster_ops);
85 static struct module *md_cluster_mod;
87 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
88 static struct workqueue_struct *md_wq;
89 static struct workqueue_struct *md_misc_wq;
90 static struct workqueue_struct *md_rdev_misc_wq;
92 static int remove_and_add_spares(struct mddev *mddev,
93 struct md_rdev *this);
94 static void mddev_detach(struct mddev *mddev);
97 * Default number of read corrections we'll attempt on an rdev
98 * before ejecting it from the array. We divide the read error
99 * count by 2 for every hour elapsed between read errors.
101 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
102 /* Default safemode delay: 200 msec */
103 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
105 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
106 * is 1000 KB/sec, so the extra system load does not show up that much.
107 * Increase it if you want to have more _guaranteed_ speed. Note that
108 * the RAID driver will use the maximum available bandwidth if the IO
109 * subsystem is idle. There is also an 'absolute maximum' reconstruction
110 * speed limit - in case reconstruction slows down your system despite
113 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
114 * or /sys/block/mdX/md/sync_speed_{min,max}
117 static int sysctl_speed_limit_min = 1000;
118 static int sysctl_speed_limit_max = 200000;
119 static inline int speed_min(struct mddev *mddev)
121 return mddev->sync_speed_min ?
122 mddev->sync_speed_min : sysctl_speed_limit_min;
125 static inline int speed_max(struct mddev *mddev)
127 return mddev->sync_speed_max ?
128 mddev->sync_speed_max : sysctl_speed_limit_max;
131 static void rdev_uninit_serial(struct md_rdev *rdev)
133 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
136 kvfree(rdev->serial);
140 static void rdevs_uninit_serial(struct mddev *mddev)
142 struct md_rdev *rdev;
144 rdev_for_each(rdev, mddev)
145 rdev_uninit_serial(rdev);
148 static int rdev_init_serial(struct md_rdev *rdev)
150 /* serial_nums equals with BARRIER_BUCKETS_NR */
151 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
152 struct serial_in_rdev *serial = NULL;
154 if (test_bit(CollisionCheck, &rdev->flags))
157 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
162 for (i = 0; i < serial_nums; i++) {
163 struct serial_in_rdev *serial_tmp = &serial[i];
165 spin_lock_init(&serial_tmp->serial_lock);
166 serial_tmp->serial_rb = RB_ROOT_CACHED;
167 init_waitqueue_head(&serial_tmp->serial_io_wait);
170 rdev->serial = serial;
171 set_bit(CollisionCheck, &rdev->flags);
176 static int rdevs_init_serial(struct mddev *mddev)
178 struct md_rdev *rdev;
181 rdev_for_each(rdev, mddev) {
182 ret = rdev_init_serial(rdev);
187 /* Free all resources if pool is not existed */
188 if (ret && !mddev->serial_info_pool)
189 rdevs_uninit_serial(mddev);
195 * rdev needs to enable serial stuffs if it meets the conditions:
196 * 1. it is multi-queue device flaged with writemostly.
197 * 2. the write-behind mode is enabled.
199 static int rdev_need_serial(struct md_rdev *rdev)
201 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
202 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
203 test_bit(WriteMostly, &rdev->flags));
207 * Init resource for rdev(s), then create serial_info_pool if:
208 * 1. rdev is the first device which return true from rdev_enable_serial.
209 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
211 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
216 if (rdev && !rdev_need_serial(rdev) &&
217 !test_bit(CollisionCheck, &rdev->flags))
221 mddev_suspend(mddev);
224 ret = rdevs_init_serial(mddev);
226 ret = rdev_init_serial(rdev);
230 if (mddev->serial_info_pool == NULL) {
232 * already in memalloc noio context by
235 mddev->serial_info_pool =
236 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
237 sizeof(struct serial_info));
238 if (!mddev->serial_info_pool) {
239 rdevs_uninit_serial(mddev);
240 pr_err("can't alloc memory pool for serialization\n");
250 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
251 * 1. rdev is the last device flaged with CollisionCheck.
252 * 2. when bitmap is destroyed while policy is not enabled.
253 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
255 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
258 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
261 if (mddev->serial_info_pool) {
262 struct md_rdev *temp;
263 int num = 0; /* used to track if other rdevs need the pool */
266 mddev_suspend(mddev);
267 rdev_for_each(temp, mddev) {
269 if (!mddev->serialize_policy ||
270 !rdev_need_serial(temp))
271 rdev_uninit_serial(temp);
274 } else if (temp != rdev &&
275 test_bit(CollisionCheck, &temp->flags))
280 rdev_uninit_serial(rdev);
283 pr_info("The mempool could be used by other devices\n");
285 mempool_destroy(mddev->serial_info_pool);
286 mddev->serial_info_pool = NULL;
293 static struct ctl_table_header *raid_table_header;
295 static struct ctl_table raid_table[] = {
297 .procname = "speed_limit_min",
298 .data = &sysctl_speed_limit_min,
299 .maxlen = sizeof(int),
300 .mode = S_IRUGO|S_IWUSR,
301 .proc_handler = proc_dointvec,
304 .procname = "speed_limit_max",
305 .data = &sysctl_speed_limit_max,
306 .maxlen = sizeof(int),
307 .mode = S_IRUGO|S_IWUSR,
308 .proc_handler = proc_dointvec,
313 static struct ctl_table raid_dir_table[] = {
317 .mode = S_IRUGO|S_IXUGO,
323 static struct ctl_table raid_root_table[] = {
328 .child = raid_dir_table,
333 static int start_readonly;
336 * The original mechanism for creating an md device is to create
337 * a device node in /dev and to open it. This causes races with device-close.
338 * The preferred method is to write to the "new_array" module parameter.
339 * This can avoid races.
340 * Setting create_on_open to false disables the original mechanism
341 * so all the races disappear.
343 static bool create_on_open = true;
346 * We have a system wide 'event count' that is incremented
347 * on any 'interesting' event, and readers of /proc/mdstat
348 * can use 'poll' or 'select' to find out when the event
352 * start array, stop array, error, add device, remove device,
353 * start build, activate spare
355 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
356 static atomic_t md_event_count;
357 void md_new_event(void)
359 atomic_inc(&md_event_count);
360 wake_up(&md_event_waiters);
362 EXPORT_SYMBOL_GPL(md_new_event);
365 * Enables to iterate over all existing md arrays
366 * all_mddevs_lock protects this list.
368 static LIST_HEAD(all_mddevs);
369 static DEFINE_SPINLOCK(all_mddevs_lock);
372 * iterates through all used mddevs in the system.
373 * We take care to grab the all_mddevs_lock whenever navigating
374 * the list, and to always hold a refcount when unlocked.
375 * Any code which breaks out of this loop while own
376 * a reference to the current mddev and must mddev_put it.
378 #define for_each_mddev(_mddev,_tmp) \
380 for (({ spin_lock(&all_mddevs_lock); \
381 _tmp = all_mddevs.next; \
383 ({ if (_tmp != &all_mddevs) \
384 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
385 spin_unlock(&all_mddevs_lock); \
386 if (_mddev) mddev_put(_mddev); \
387 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
388 _tmp != &all_mddevs;}); \
389 ({ spin_lock(&all_mddevs_lock); \
390 _tmp = _tmp->next;}) \
393 /* Rather than calling directly into the personality make_request function,
394 * IO requests come here first so that we can check if the device is
395 * being suspended pending a reconfiguration.
396 * We hold a refcount over the call to ->make_request. By the time that
397 * call has finished, the bio has been linked into some internal structure
398 * and so is visible to ->quiesce(), so we don't need the refcount any more.
400 static bool is_suspended(struct mddev *mddev, struct bio *bio)
402 if (mddev->suspended)
404 if (bio_data_dir(bio) != WRITE)
406 if (mddev->suspend_lo >= mddev->suspend_hi)
408 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
410 if (bio_end_sector(bio) < mddev->suspend_lo)
415 void md_handle_request(struct mddev *mddev, struct bio *bio)
419 if (is_suspended(mddev, bio)) {
421 /* Bail out if REQ_NOWAIT is set for the bio */
422 if (bio->bi_opf & REQ_NOWAIT) {
424 bio_wouldblock_error(bio);
428 prepare_to_wait(&mddev->sb_wait, &__wait,
429 TASK_UNINTERRUPTIBLE);
430 if (!is_suspended(mddev, bio))
436 finish_wait(&mddev->sb_wait, &__wait);
438 atomic_inc(&mddev->active_io);
441 if (!mddev->pers->make_request(mddev, bio)) {
442 atomic_dec(&mddev->active_io);
443 wake_up(&mddev->sb_wait);
444 goto check_suspended;
447 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
448 wake_up(&mddev->sb_wait);
450 EXPORT_SYMBOL(md_handle_request);
452 static void md_submit_bio(struct bio *bio)
454 const int rw = bio_data_dir(bio);
455 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
457 if (mddev == NULL || mddev->pers == NULL) {
462 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
467 blk_queue_split(&bio);
469 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
470 if (bio_sectors(bio) != 0)
471 bio->bi_status = BLK_STS_IOERR;
476 /* bio could be mergeable after passing to underlayer */
477 bio->bi_opf &= ~REQ_NOMERGE;
479 md_handle_request(mddev, bio);
482 /* mddev_suspend makes sure no new requests are submitted
483 * to the device, and that any requests that have been submitted
484 * are completely handled.
485 * Once mddev_detach() is called and completes, the module will be
488 void mddev_suspend(struct mddev *mddev)
490 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
491 lockdep_assert_held(&mddev->reconfig_mutex);
492 if (mddev->suspended++)
495 wake_up(&mddev->sb_wait);
496 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
497 smp_mb__after_atomic();
498 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
499 mddev->pers->quiesce(mddev, 1);
500 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
501 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
503 del_timer_sync(&mddev->safemode_timer);
504 /* restrict memory reclaim I/O during raid array is suspend */
505 mddev->noio_flag = memalloc_noio_save();
507 EXPORT_SYMBOL_GPL(mddev_suspend);
509 void mddev_resume(struct mddev *mddev)
511 /* entred the memalloc scope from mddev_suspend() */
512 memalloc_noio_restore(mddev->noio_flag);
513 lockdep_assert_held(&mddev->reconfig_mutex);
514 if (--mddev->suspended)
516 wake_up(&mddev->sb_wait);
517 mddev->pers->quiesce(mddev, 0);
519 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
520 md_wakeup_thread(mddev->thread);
521 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
523 EXPORT_SYMBOL_GPL(mddev_resume);
526 * Generic flush handling for md
529 static void md_end_flush(struct bio *bio)
531 struct md_rdev *rdev = bio->bi_private;
532 struct mddev *mddev = rdev->mddev;
534 rdev_dec_pending(rdev, mddev);
536 if (atomic_dec_and_test(&mddev->flush_pending)) {
537 /* The pre-request flush has finished */
538 queue_work(md_wq, &mddev->flush_work);
543 static void md_submit_flush_data(struct work_struct *ws);
545 static void submit_flushes(struct work_struct *ws)
547 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
548 struct md_rdev *rdev;
550 mddev->start_flush = ktime_get_boottime();
551 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
552 atomic_set(&mddev->flush_pending, 1);
554 rdev_for_each_rcu(rdev, mddev)
555 if (rdev->raid_disk >= 0 &&
556 !test_bit(Faulty, &rdev->flags)) {
557 /* Take two references, one is dropped
558 * when request finishes, one after
559 * we reclaim rcu_read_lock
562 atomic_inc(&rdev->nr_pending);
563 atomic_inc(&rdev->nr_pending);
565 bi = bio_alloc_bioset(rdev->bdev, 0,
566 REQ_OP_WRITE | REQ_PREFLUSH,
567 GFP_NOIO, &mddev->bio_set);
568 bi->bi_end_io = md_end_flush;
569 bi->bi_private = rdev;
570 atomic_inc(&mddev->flush_pending);
573 rdev_dec_pending(rdev, mddev);
576 if (atomic_dec_and_test(&mddev->flush_pending))
577 queue_work(md_wq, &mddev->flush_work);
580 static void md_submit_flush_data(struct work_struct *ws)
582 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
583 struct bio *bio = mddev->flush_bio;
586 * must reset flush_bio before calling into md_handle_request to avoid a
587 * deadlock, because other bios passed md_handle_request suspend check
588 * could wait for this and below md_handle_request could wait for those
589 * bios because of suspend check
591 spin_lock_irq(&mddev->lock);
592 mddev->prev_flush_start = mddev->start_flush;
593 mddev->flush_bio = NULL;
594 spin_unlock_irq(&mddev->lock);
595 wake_up(&mddev->sb_wait);
597 if (bio->bi_iter.bi_size == 0) {
598 /* an empty barrier - all done */
601 bio->bi_opf &= ~REQ_PREFLUSH;
602 md_handle_request(mddev, bio);
607 * Manages consolidation of flushes and submitting any flushes needed for
608 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
609 * being finished in another context. Returns false if the flushing is
610 * complete but still needs the I/O portion of the bio to be processed.
612 bool md_flush_request(struct mddev *mddev, struct bio *bio)
614 ktime_t req_start = ktime_get_boottime();
615 spin_lock_irq(&mddev->lock);
616 /* flush requests wait until ongoing flush completes,
617 * hence coalescing all the pending requests.
619 wait_event_lock_irq(mddev->sb_wait,
621 ktime_before(req_start, mddev->prev_flush_start),
623 /* new request after previous flush is completed */
624 if (ktime_after(req_start, mddev->prev_flush_start)) {
625 WARN_ON(mddev->flush_bio);
626 mddev->flush_bio = bio;
629 spin_unlock_irq(&mddev->lock);
632 INIT_WORK(&mddev->flush_work, submit_flushes);
633 queue_work(md_wq, &mddev->flush_work);
635 /* flush was performed for some other bio while we waited. */
636 if (bio->bi_iter.bi_size == 0)
637 /* an empty barrier - all done */
640 bio->bi_opf &= ~REQ_PREFLUSH;
646 EXPORT_SYMBOL(md_flush_request);
648 static inline struct mddev *mddev_get(struct mddev *mddev)
650 atomic_inc(&mddev->active);
654 static void mddev_delayed_delete(struct work_struct *ws);
656 static void mddev_put(struct mddev *mddev)
658 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
660 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
661 mddev->ctime == 0 && !mddev->hold_active) {
662 /* Array is not configured at all, and not held active,
664 list_del_init(&mddev->all_mddevs);
667 * Call queue_work inside the spinlock so that
668 * flush_workqueue() after mddev_find will succeed in waiting
669 * for the work to be done.
671 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
672 queue_work(md_misc_wq, &mddev->del_work);
674 spin_unlock(&all_mddevs_lock);
677 static void md_safemode_timeout(struct timer_list *t);
679 void mddev_init(struct mddev *mddev)
681 kobject_init(&mddev->kobj, &md_ktype);
682 mutex_init(&mddev->open_mutex);
683 mutex_init(&mddev->reconfig_mutex);
684 mutex_init(&mddev->bitmap_info.mutex);
685 INIT_LIST_HEAD(&mddev->disks);
686 INIT_LIST_HEAD(&mddev->all_mddevs);
687 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
688 atomic_set(&mddev->active, 1);
689 atomic_set(&mddev->openers, 0);
690 atomic_set(&mddev->active_io, 0);
691 spin_lock_init(&mddev->lock);
692 atomic_set(&mddev->flush_pending, 0);
693 init_waitqueue_head(&mddev->sb_wait);
694 init_waitqueue_head(&mddev->recovery_wait);
695 mddev->reshape_position = MaxSector;
696 mddev->reshape_backwards = 0;
697 mddev->last_sync_action = "none";
698 mddev->resync_min = 0;
699 mddev->resync_max = MaxSector;
700 mddev->level = LEVEL_NONE;
702 EXPORT_SYMBOL_GPL(mddev_init);
704 static struct mddev *mddev_find_locked(dev_t unit)
708 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
709 if (mddev->unit == unit)
715 /* find an unused unit number */
716 static dev_t mddev_alloc_unit(void)
718 static int next_minor = 512;
719 int start = next_minor;
724 dev = MKDEV(MD_MAJOR, next_minor);
726 if (next_minor > MINORMASK)
728 if (next_minor == start)
729 return 0; /* Oh dear, all in use. */
730 is_free = !mddev_find_locked(dev);
736 static struct mddev *mddev_find(dev_t unit)
740 if (MAJOR(unit) != MD_MAJOR)
741 unit &= ~((1 << MdpMinorShift) - 1);
743 spin_lock(&all_mddevs_lock);
744 mddev = mddev_find_locked(unit);
747 spin_unlock(&all_mddevs_lock);
752 static struct mddev *mddev_alloc(dev_t unit)
757 if (unit && MAJOR(unit) != MD_MAJOR)
758 unit &= ~((1 << MdpMinorShift) - 1);
760 new = kzalloc(sizeof(*new), GFP_KERNEL);
762 return ERR_PTR(-ENOMEM);
765 spin_lock(&all_mddevs_lock);
768 if (mddev_find_locked(unit))
771 if (MAJOR(unit) == MD_MAJOR)
772 new->md_minor = MINOR(unit);
774 new->md_minor = MINOR(unit) >> MdpMinorShift;
775 new->hold_active = UNTIL_IOCTL;
778 new->unit = mddev_alloc_unit();
781 new->md_minor = MINOR(new->unit);
782 new->hold_active = UNTIL_STOP;
785 list_add(&new->all_mddevs, &all_mddevs);
786 spin_unlock(&all_mddevs_lock);
789 spin_unlock(&all_mddevs_lock);
791 return ERR_PTR(error);
794 static const struct attribute_group md_redundancy_group;
796 void mddev_unlock(struct mddev *mddev)
798 if (mddev->to_remove) {
799 /* These cannot be removed under reconfig_mutex as
800 * an access to the files will try to take reconfig_mutex
801 * while holding the file unremovable, which leads to
803 * So hold set sysfs_active while the remove in happeing,
804 * and anything else which might set ->to_remove or my
805 * otherwise change the sysfs namespace will fail with
806 * -EBUSY if sysfs_active is still set.
807 * We set sysfs_active under reconfig_mutex and elsewhere
808 * test it under the same mutex to ensure its correct value
811 const struct attribute_group *to_remove = mddev->to_remove;
812 mddev->to_remove = NULL;
813 mddev->sysfs_active = 1;
814 mutex_unlock(&mddev->reconfig_mutex);
816 if (mddev->kobj.sd) {
817 if (to_remove != &md_redundancy_group)
818 sysfs_remove_group(&mddev->kobj, to_remove);
819 if (mddev->pers == NULL ||
820 mddev->pers->sync_request == NULL) {
821 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
822 if (mddev->sysfs_action)
823 sysfs_put(mddev->sysfs_action);
824 if (mddev->sysfs_completed)
825 sysfs_put(mddev->sysfs_completed);
826 if (mddev->sysfs_degraded)
827 sysfs_put(mddev->sysfs_degraded);
828 mddev->sysfs_action = NULL;
829 mddev->sysfs_completed = NULL;
830 mddev->sysfs_degraded = NULL;
833 mddev->sysfs_active = 0;
835 mutex_unlock(&mddev->reconfig_mutex);
837 /* As we've dropped the mutex we need a spinlock to
838 * make sure the thread doesn't disappear
840 spin_lock(&pers_lock);
841 md_wakeup_thread(mddev->thread);
842 wake_up(&mddev->sb_wait);
843 spin_unlock(&pers_lock);
845 EXPORT_SYMBOL_GPL(mddev_unlock);
847 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
849 struct md_rdev *rdev;
851 rdev_for_each_rcu(rdev, mddev)
852 if (rdev->desc_nr == nr)
857 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
859 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
861 struct md_rdev *rdev;
863 rdev_for_each(rdev, mddev)
864 if (rdev->bdev->bd_dev == dev)
870 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
872 struct md_rdev *rdev;
874 rdev_for_each_rcu(rdev, mddev)
875 if (rdev->bdev->bd_dev == dev)
880 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
882 static struct md_personality *find_pers(int level, char *clevel)
884 struct md_personality *pers;
885 list_for_each_entry(pers, &pers_list, list) {
886 if (level != LEVEL_NONE && pers->level == level)
888 if (strcmp(pers->name, clevel)==0)
894 /* return the offset of the super block in 512byte sectors */
895 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
897 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
900 static int alloc_disk_sb(struct md_rdev *rdev)
902 rdev->sb_page = alloc_page(GFP_KERNEL);
908 void md_rdev_clear(struct md_rdev *rdev)
911 put_page(rdev->sb_page);
913 rdev->sb_page = NULL;
918 put_page(rdev->bb_page);
919 rdev->bb_page = NULL;
921 badblocks_exit(&rdev->badblocks);
923 EXPORT_SYMBOL_GPL(md_rdev_clear);
925 static void super_written(struct bio *bio)
927 struct md_rdev *rdev = bio->bi_private;
928 struct mddev *mddev = rdev->mddev;
930 if (bio->bi_status) {
931 pr_err("md: %s gets error=%d\n", __func__,
932 blk_status_to_errno(bio->bi_status));
933 md_error(mddev, rdev);
934 if (!test_bit(Faulty, &rdev->flags)
935 && (bio->bi_opf & MD_FAILFAST)) {
936 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
937 set_bit(LastDev, &rdev->flags);
940 clear_bit(LastDev, &rdev->flags);
942 if (atomic_dec_and_test(&mddev->pending_writes))
943 wake_up(&mddev->sb_wait);
944 rdev_dec_pending(rdev, mddev);
948 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
949 sector_t sector, int size, struct page *page)
951 /* write first size bytes of page to sector of rdev
952 * Increment mddev->pending_writes before returning
953 * and decrement it on completion, waking up sb_wait
954 * if zero is reached.
955 * If an error occurred, call md_error
962 if (test_bit(Faulty, &rdev->flags))
965 bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
967 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA,
968 GFP_NOIO, &mddev->sync_set);
970 atomic_inc(&rdev->nr_pending);
972 bio->bi_iter.bi_sector = sector;
973 bio_add_page(bio, page, size, 0);
974 bio->bi_private = rdev;
975 bio->bi_end_io = super_written;
977 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
978 test_bit(FailFast, &rdev->flags) &&
979 !test_bit(LastDev, &rdev->flags))
980 bio->bi_opf |= MD_FAILFAST;
982 atomic_inc(&mddev->pending_writes);
986 int md_super_wait(struct mddev *mddev)
988 /* wait for all superblock writes that were scheduled to complete */
989 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
990 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
995 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
996 struct page *page, int op, int op_flags, bool metadata_op)
1001 if (metadata_op && rdev->meta_bdev)
1002 bio_init(&bio, rdev->meta_bdev, &bvec, 1, op | op_flags);
1004 bio_init(&bio, rdev->bdev, &bvec, 1, op | op_flags);
1007 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1008 else if (rdev->mddev->reshape_position != MaxSector &&
1009 (rdev->mddev->reshape_backwards ==
1010 (sector >= rdev->mddev->reshape_position)))
1011 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1013 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1014 bio_add_page(&bio, page, size, 0);
1016 submit_bio_wait(&bio);
1018 return !bio.bi_status;
1020 EXPORT_SYMBOL_GPL(sync_page_io);
1022 static int read_disk_sb(struct md_rdev *rdev, int size)
1024 if (rdev->sb_loaded)
1027 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1029 rdev->sb_loaded = 1;
1033 pr_err("md: disabled device %pg, could not read superblock.\n",
1038 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1040 return sb1->set_uuid0 == sb2->set_uuid0 &&
1041 sb1->set_uuid1 == sb2->set_uuid1 &&
1042 sb1->set_uuid2 == sb2->set_uuid2 &&
1043 sb1->set_uuid3 == sb2->set_uuid3;
1046 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1049 mdp_super_t *tmp1, *tmp2;
1051 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1052 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1054 if (!tmp1 || !tmp2) {
1063 * nr_disks is not constant
1068 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1075 static u32 md_csum_fold(u32 csum)
1077 csum = (csum & 0xffff) + (csum >> 16);
1078 return (csum & 0xffff) + (csum >> 16);
1081 static unsigned int calc_sb_csum(mdp_super_t *sb)
1084 u32 *sb32 = (u32*)sb;
1086 unsigned int disk_csum, csum;
1088 disk_csum = sb->sb_csum;
1091 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1093 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1096 /* This used to use csum_partial, which was wrong for several
1097 * reasons including that different results are returned on
1098 * different architectures. It isn't critical that we get exactly
1099 * the same return value as before (we always csum_fold before
1100 * testing, and that removes any differences). However as we
1101 * know that csum_partial always returned a 16bit value on
1102 * alphas, do a fold to maximise conformity to previous behaviour.
1104 sb->sb_csum = md_csum_fold(disk_csum);
1106 sb->sb_csum = disk_csum;
1112 * Handle superblock details.
1113 * We want to be able to handle multiple superblock formats
1114 * so we have a common interface to them all, and an array of
1115 * different handlers.
1116 * We rely on user-space to write the initial superblock, and support
1117 * reading and updating of superblocks.
1118 * Interface methods are:
1119 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1120 * loads and validates a superblock on dev.
1121 * if refdev != NULL, compare superblocks on both devices
1123 * 0 - dev has a superblock that is compatible with refdev
1124 * 1 - dev has a superblock that is compatible and newer than refdev
1125 * so dev should be used as the refdev in future
1126 * -EINVAL superblock incompatible or invalid
1127 * -othererror e.g. -EIO
1129 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1130 * Verify that dev is acceptable into mddev.
1131 * The first time, mddev->raid_disks will be 0, and data from
1132 * dev should be merged in. Subsequent calls check that dev
1133 * is new enough. Return 0 or -EINVAL
1135 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1136 * Update the superblock for rdev with data in mddev
1137 * This does not write to disc.
1143 struct module *owner;
1144 int (*load_super)(struct md_rdev *rdev,
1145 struct md_rdev *refdev,
1147 int (*validate_super)(struct mddev *mddev,
1148 struct md_rdev *rdev);
1149 void (*sync_super)(struct mddev *mddev,
1150 struct md_rdev *rdev);
1151 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1152 sector_t num_sectors);
1153 int (*allow_new_offset)(struct md_rdev *rdev,
1154 unsigned long long new_offset);
1158 * Check that the given mddev has no bitmap.
1160 * This function is called from the run method of all personalities that do not
1161 * support bitmaps. It prints an error message and returns non-zero if mddev
1162 * has a bitmap. Otherwise, it returns 0.
1165 int md_check_no_bitmap(struct mddev *mddev)
1167 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1169 pr_warn("%s: bitmaps are not supported for %s\n",
1170 mdname(mddev), mddev->pers->name);
1173 EXPORT_SYMBOL(md_check_no_bitmap);
1176 * load_super for 0.90.0
1178 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1182 bool spare_disk = true;
1185 * Calculate the position of the superblock (512byte sectors),
1186 * it's at the end of the disk.
1188 * It also happens to be a multiple of 4Kb.
1190 rdev->sb_start = calc_dev_sboffset(rdev);
1192 ret = read_disk_sb(rdev, MD_SB_BYTES);
1198 sb = page_address(rdev->sb_page);
1200 if (sb->md_magic != MD_SB_MAGIC) {
1201 pr_warn("md: invalid raid superblock magic on %pg\n",
1206 if (sb->major_version != 0 ||
1207 sb->minor_version < 90 ||
1208 sb->minor_version > 91) {
1209 pr_warn("Bad version number %d.%d on %pg\n",
1210 sb->major_version, sb->minor_version, rdev->bdev);
1214 if (sb->raid_disks <= 0)
1217 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1218 pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
1222 rdev->preferred_minor = sb->md_minor;
1223 rdev->data_offset = 0;
1224 rdev->new_data_offset = 0;
1225 rdev->sb_size = MD_SB_BYTES;
1226 rdev->badblocks.shift = -1;
1228 if (sb->level == LEVEL_MULTIPATH)
1231 rdev->desc_nr = sb->this_disk.number;
1233 /* not spare disk, or LEVEL_MULTIPATH */
1234 if (sb->level == LEVEL_MULTIPATH ||
1235 (rdev->desc_nr >= 0 &&
1236 rdev->desc_nr < MD_SB_DISKS &&
1237 sb->disks[rdev->desc_nr].state &
1238 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1248 mdp_super_t *refsb = page_address(refdev->sb_page);
1249 if (!md_uuid_equal(refsb, sb)) {
1250 pr_warn("md: %pg has different UUID to %pg\n",
1251 rdev->bdev, refdev->bdev);
1254 if (!md_sb_equal(refsb, sb)) {
1255 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1256 rdev->bdev, refdev->bdev);
1260 ev2 = md_event(refsb);
1262 if (!spare_disk && ev1 > ev2)
1267 rdev->sectors = rdev->sb_start;
1268 /* Limit to 4TB as metadata cannot record more than that.
1269 * (not needed for Linear and RAID0 as metadata doesn't
1272 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1273 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1275 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1276 /* "this cannot possibly happen" ... */
1284 * validate_super for 0.90.0
1286 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1289 mdp_super_t *sb = page_address(rdev->sb_page);
1290 __u64 ev1 = md_event(sb);
1292 rdev->raid_disk = -1;
1293 clear_bit(Faulty, &rdev->flags);
1294 clear_bit(In_sync, &rdev->flags);
1295 clear_bit(Bitmap_sync, &rdev->flags);
1296 clear_bit(WriteMostly, &rdev->flags);
1298 if (mddev->raid_disks == 0) {
1299 mddev->major_version = 0;
1300 mddev->minor_version = sb->minor_version;
1301 mddev->patch_version = sb->patch_version;
1302 mddev->external = 0;
1303 mddev->chunk_sectors = sb->chunk_size >> 9;
1304 mddev->ctime = sb->ctime;
1305 mddev->utime = sb->utime;
1306 mddev->level = sb->level;
1307 mddev->clevel[0] = 0;
1308 mddev->layout = sb->layout;
1309 mddev->raid_disks = sb->raid_disks;
1310 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1311 mddev->events = ev1;
1312 mddev->bitmap_info.offset = 0;
1313 mddev->bitmap_info.space = 0;
1314 /* bitmap can use 60 K after the 4K superblocks */
1315 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1316 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1317 mddev->reshape_backwards = 0;
1319 if (mddev->minor_version >= 91) {
1320 mddev->reshape_position = sb->reshape_position;
1321 mddev->delta_disks = sb->delta_disks;
1322 mddev->new_level = sb->new_level;
1323 mddev->new_layout = sb->new_layout;
1324 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1325 if (mddev->delta_disks < 0)
1326 mddev->reshape_backwards = 1;
1328 mddev->reshape_position = MaxSector;
1329 mddev->delta_disks = 0;
1330 mddev->new_level = mddev->level;
1331 mddev->new_layout = mddev->layout;
1332 mddev->new_chunk_sectors = mddev->chunk_sectors;
1334 if (mddev->level == 0)
1337 if (sb->state & (1<<MD_SB_CLEAN))
1338 mddev->recovery_cp = MaxSector;
1340 if (sb->events_hi == sb->cp_events_hi &&
1341 sb->events_lo == sb->cp_events_lo) {
1342 mddev->recovery_cp = sb->recovery_cp;
1344 mddev->recovery_cp = 0;
1347 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1348 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1349 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1350 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1352 mddev->max_disks = MD_SB_DISKS;
1354 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1355 mddev->bitmap_info.file == NULL) {
1356 mddev->bitmap_info.offset =
1357 mddev->bitmap_info.default_offset;
1358 mddev->bitmap_info.space =
1359 mddev->bitmap_info.default_space;
1362 } else if (mddev->pers == NULL) {
1363 /* Insist on good event counter while assembling, except
1364 * for spares (which don't need an event count) */
1366 if (sb->disks[rdev->desc_nr].state & (
1367 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1368 if (ev1 < mddev->events)
1370 } else if (mddev->bitmap) {
1371 /* if adding to array with a bitmap, then we can accept an
1372 * older device ... but not too old.
1374 if (ev1 < mddev->bitmap->events_cleared)
1376 if (ev1 < mddev->events)
1377 set_bit(Bitmap_sync, &rdev->flags);
1379 if (ev1 < mddev->events)
1380 /* just a hot-add of a new device, leave raid_disk at -1 */
1384 if (mddev->level != LEVEL_MULTIPATH) {
1385 desc = sb->disks + rdev->desc_nr;
1387 if (desc->state & (1<<MD_DISK_FAULTY))
1388 set_bit(Faulty, &rdev->flags);
1389 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1390 desc->raid_disk < mddev->raid_disks */) {
1391 set_bit(In_sync, &rdev->flags);
1392 rdev->raid_disk = desc->raid_disk;
1393 rdev->saved_raid_disk = desc->raid_disk;
1394 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1395 /* active but not in sync implies recovery up to
1396 * reshape position. We don't know exactly where
1397 * that is, so set to zero for now */
1398 if (mddev->minor_version >= 91) {
1399 rdev->recovery_offset = 0;
1400 rdev->raid_disk = desc->raid_disk;
1403 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1404 set_bit(WriteMostly, &rdev->flags);
1405 if (desc->state & (1<<MD_DISK_FAILFAST))
1406 set_bit(FailFast, &rdev->flags);
1407 } else /* MULTIPATH are always insync */
1408 set_bit(In_sync, &rdev->flags);
1413 * sync_super for 0.90.0
1415 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1418 struct md_rdev *rdev2;
1419 int next_spare = mddev->raid_disks;
1421 /* make rdev->sb match mddev data..
1424 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1425 * 3/ any empty disks < next_spare become removed
1427 * disks[0] gets initialised to REMOVED because
1428 * we cannot be sure from other fields if it has
1429 * been initialised or not.
1432 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1434 rdev->sb_size = MD_SB_BYTES;
1436 sb = page_address(rdev->sb_page);
1438 memset(sb, 0, sizeof(*sb));
1440 sb->md_magic = MD_SB_MAGIC;
1441 sb->major_version = mddev->major_version;
1442 sb->patch_version = mddev->patch_version;
1443 sb->gvalid_words = 0; /* ignored */
1444 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1445 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1446 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1447 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1449 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1450 sb->level = mddev->level;
1451 sb->size = mddev->dev_sectors / 2;
1452 sb->raid_disks = mddev->raid_disks;
1453 sb->md_minor = mddev->md_minor;
1454 sb->not_persistent = 0;
1455 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1457 sb->events_hi = (mddev->events>>32);
1458 sb->events_lo = (u32)mddev->events;
1460 if (mddev->reshape_position == MaxSector)
1461 sb->minor_version = 90;
1463 sb->minor_version = 91;
1464 sb->reshape_position = mddev->reshape_position;
1465 sb->new_level = mddev->new_level;
1466 sb->delta_disks = mddev->delta_disks;
1467 sb->new_layout = mddev->new_layout;
1468 sb->new_chunk = mddev->new_chunk_sectors << 9;
1470 mddev->minor_version = sb->minor_version;
1473 sb->recovery_cp = mddev->recovery_cp;
1474 sb->cp_events_hi = (mddev->events>>32);
1475 sb->cp_events_lo = (u32)mddev->events;
1476 if (mddev->recovery_cp == MaxSector)
1477 sb->state = (1<< MD_SB_CLEAN);
1479 sb->recovery_cp = 0;
1481 sb->layout = mddev->layout;
1482 sb->chunk_size = mddev->chunk_sectors << 9;
1484 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1485 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1487 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1488 rdev_for_each(rdev2, mddev) {
1491 int is_active = test_bit(In_sync, &rdev2->flags);
1493 if (rdev2->raid_disk >= 0 &&
1494 sb->minor_version >= 91)
1495 /* we have nowhere to store the recovery_offset,
1496 * but if it is not below the reshape_position,
1497 * we can piggy-back on that.
1500 if (rdev2->raid_disk < 0 ||
1501 test_bit(Faulty, &rdev2->flags))
1504 desc_nr = rdev2->raid_disk;
1506 desc_nr = next_spare++;
1507 rdev2->desc_nr = desc_nr;
1508 d = &sb->disks[rdev2->desc_nr];
1510 d->number = rdev2->desc_nr;
1511 d->major = MAJOR(rdev2->bdev->bd_dev);
1512 d->minor = MINOR(rdev2->bdev->bd_dev);
1514 d->raid_disk = rdev2->raid_disk;
1516 d->raid_disk = rdev2->desc_nr; /* compatibility */
1517 if (test_bit(Faulty, &rdev2->flags))
1518 d->state = (1<<MD_DISK_FAULTY);
1519 else if (is_active) {
1520 d->state = (1<<MD_DISK_ACTIVE);
1521 if (test_bit(In_sync, &rdev2->flags))
1522 d->state |= (1<<MD_DISK_SYNC);
1530 if (test_bit(WriteMostly, &rdev2->flags))
1531 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1532 if (test_bit(FailFast, &rdev2->flags))
1533 d->state |= (1<<MD_DISK_FAILFAST);
1535 /* now set the "removed" and "faulty" bits on any missing devices */
1536 for (i=0 ; i < mddev->raid_disks ; i++) {
1537 mdp_disk_t *d = &sb->disks[i];
1538 if (d->state == 0 && d->number == 0) {
1541 d->state = (1<<MD_DISK_REMOVED);
1542 d->state |= (1<<MD_DISK_FAULTY);
1546 sb->nr_disks = nr_disks;
1547 sb->active_disks = active;
1548 sb->working_disks = working;
1549 sb->failed_disks = failed;
1550 sb->spare_disks = spare;
1552 sb->this_disk = sb->disks[rdev->desc_nr];
1553 sb->sb_csum = calc_sb_csum(sb);
1557 * rdev_size_change for 0.90.0
1559 static unsigned long long
1560 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1562 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1563 return 0; /* component must fit device */
1564 if (rdev->mddev->bitmap_info.offset)
1565 return 0; /* can't move bitmap */
1566 rdev->sb_start = calc_dev_sboffset(rdev);
1567 if (!num_sectors || num_sectors > rdev->sb_start)
1568 num_sectors = rdev->sb_start;
1569 /* Limit to 4TB as metadata cannot record more than that.
1570 * 4TB == 2^32 KB, or 2*2^32 sectors.
1572 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1573 num_sectors = (sector_t)(2ULL << 32) - 2;
1575 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1577 } while (md_super_wait(rdev->mddev) < 0);
1582 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1584 /* non-zero offset changes not possible with v0.90 */
1585 return new_offset == 0;
1589 * version 1 superblock
1592 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1596 unsigned long long newcsum;
1597 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1598 __le32 *isuper = (__le32*)sb;
1600 disk_csum = sb->sb_csum;
1603 for (; size >= 4; size -= 4)
1604 newcsum += le32_to_cpu(*isuper++);
1607 newcsum += le16_to_cpu(*(__le16*) isuper);
1609 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1610 sb->sb_csum = disk_csum;
1611 return cpu_to_le32(csum);
1614 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1616 struct mdp_superblock_1 *sb;
1621 bool spare_disk = true;
1624 * Calculate the position of the superblock in 512byte sectors.
1625 * It is always aligned to a 4K boundary and
1626 * depeding on minor_version, it can be:
1627 * 0: At least 8K, but less than 12K, from end of device
1628 * 1: At start of device
1629 * 2: 4K from start of device.
1631 switch(minor_version) {
1633 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1634 sb_start &= ~(sector_t)(4*2-1);
1645 rdev->sb_start = sb_start;
1647 /* superblock is rarely larger than 1K, but it can be larger,
1648 * and it is safe to read 4k, so we do that
1650 ret = read_disk_sb(rdev, 4096);
1651 if (ret) return ret;
1653 sb = page_address(rdev->sb_page);
1655 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1656 sb->major_version != cpu_to_le32(1) ||
1657 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1658 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1659 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1662 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1663 pr_warn("md: invalid superblock checksum on %pg\n",
1667 if (le64_to_cpu(sb->data_size) < 10) {
1668 pr_warn("md: data_size too small on %pg\n",
1674 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1675 /* Some padding is non-zero, might be a new feature */
1678 rdev->preferred_minor = 0xffff;
1679 rdev->data_offset = le64_to_cpu(sb->data_offset);
1680 rdev->new_data_offset = rdev->data_offset;
1681 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1682 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1683 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1684 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1686 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1687 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1688 if (rdev->sb_size & bmask)
1689 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1692 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1695 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1698 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1701 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1703 if (!rdev->bb_page) {
1704 rdev->bb_page = alloc_page(GFP_KERNEL);
1708 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1709 rdev->badblocks.count == 0) {
1710 /* need to load the bad block list.
1711 * Currently we limit it to one page.
1717 int sectors = le16_to_cpu(sb->bblog_size);
1718 if (sectors > (PAGE_SIZE / 512))
1720 offset = le32_to_cpu(sb->bblog_offset);
1723 bb_sector = (long long)offset;
1724 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1725 rdev->bb_page, REQ_OP_READ, 0, true))
1727 bbp = (__le64 *)page_address(rdev->bb_page);
1728 rdev->badblocks.shift = sb->bblog_shift;
1729 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1730 u64 bb = le64_to_cpu(*bbp);
1731 int count = bb & (0x3ff);
1732 u64 sector = bb >> 10;
1733 sector <<= sb->bblog_shift;
1734 count <<= sb->bblog_shift;
1737 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1740 } else if (sb->bblog_offset != 0)
1741 rdev->badblocks.shift = 0;
1743 if ((le32_to_cpu(sb->feature_map) &
1744 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1745 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1746 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1747 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1750 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1754 /* not spare disk, or LEVEL_MULTIPATH */
1755 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1756 (rdev->desc_nr >= 0 &&
1757 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1758 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1759 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1769 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1771 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1772 sb->level != refsb->level ||
1773 sb->layout != refsb->layout ||
1774 sb->chunksize != refsb->chunksize) {
1775 pr_warn("md: %pg has strangely different superblock to %pg\n",
1780 ev1 = le64_to_cpu(sb->events);
1781 ev2 = le64_to_cpu(refsb->events);
1783 if (!spare_disk && ev1 > ev2)
1789 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1791 sectors = rdev->sb_start;
1792 if (sectors < le64_to_cpu(sb->data_size))
1794 rdev->sectors = le64_to_cpu(sb->data_size);
1798 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1800 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1801 __u64 ev1 = le64_to_cpu(sb->events);
1803 rdev->raid_disk = -1;
1804 clear_bit(Faulty, &rdev->flags);
1805 clear_bit(In_sync, &rdev->flags);
1806 clear_bit(Bitmap_sync, &rdev->flags);
1807 clear_bit(WriteMostly, &rdev->flags);
1809 if (mddev->raid_disks == 0) {
1810 mddev->major_version = 1;
1811 mddev->patch_version = 0;
1812 mddev->external = 0;
1813 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1814 mddev->ctime = le64_to_cpu(sb->ctime);
1815 mddev->utime = le64_to_cpu(sb->utime);
1816 mddev->level = le32_to_cpu(sb->level);
1817 mddev->clevel[0] = 0;
1818 mddev->layout = le32_to_cpu(sb->layout);
1819 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1820 mddev->dev_sectors = le64_to_cpu(sb->size);
1821 mddev->events = ev1;
1822 mddev->bitmap_info.offset = 0;
1823 mddev->bitmap_info.space = 0;
1824 /* Default location for bitmap is 1K after superblock
1825 * using 3K - total of 4K
1827 mddev->bitmap_info.default_offset = 1024 >> 9;
1828 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1829 mddev->reshape_backwards = 0;
1831 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1832 memcpy(mddev->uuid, sb->set_uuid, 16);
1834 mddev->max_disks = (4096-256)/2;
1836 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1837 mddev->bitmap_info.file == NULL) {
1838 mddev->bitmap_info.offset =
1839 (__s32)le32_to_cpu(sb->bitmap_offset);
1840 /* Metadata doesn't record how much space is available.
1841 * For 1.0, we assume we can use up to the superblock
1842 * if before, else to 4K beyond superblock.
1843 * For others, assume no change is possible.
1845 if (mddev->minor_version > 0)
1846 mddev->bitmap_info.space = 0;
1847 else if (mddev->bitmap_info.offset > 0)
1848 mddev->bitmap_info.space =
1849 8 - mddev->bitmap_info.offset;
1851 mddev->bitmap_info.space =
1852 -mddev->bitmap_info.offset;
1855 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1856 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1857 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1858 mddev->new_level = le32_to_cpu(sb->new_level);
1859 mddev->new_layout = le32_to_cpu(sb->new_layout);
1860 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1861 if (mddev->delta_disks < 0 ||
1862 (mddev->delta_disks == 0 &&
1863 (le32_to_cpu(sb->feature_map)
1864 & MD_FEATURE_RESHAPE_BACKWARDS)))
1865 mddev->reshape_backwards = 1;
1867 mddev->reshape_position = MaxSector;
1868 mddev->delta_disks = 0;
1869 mddev->new_level = mddev->level;
1870 mddev->new_layout = mddev->layout;
1871 mddev->new_chunk_sectors = mddev->chunk_sectors;
1874 if (mddev->level == 0 &&
1875 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1878 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1879 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1881 if (le32_to_cpu(sb->feature_map) &
1882 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1883 if (le32_to_cpu(sb->feature_map) &
1884 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1886 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1887 (le32_to_cpu(sb->feature_map) &
1888 MD_FEATURE_MULTIPLE_PPLS))
1890 set_bit(MD_HAS_PPL, &mddev->flags);
1892 } else if (mddev->pers == NULL) {
1893 /* Insist of good event counter while assembling, except for
1894 * spares (which don't need an event count) */
1896 if (rdev->desc_nr >= 0 &&
1897 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1898 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1899 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1900 if (ev1 < mddev->events)
1902 } else if (mddev->bitmap) {
1903 /* If adding to array with a bitmap, then we can accept an
1904 * older device, but not too old.
1906 if (ev1 < mddev->bitmap->events_cleared)
1908 if (ev1 < mddev->events)
1909 set_bit(Bitmap_sync, &rdev->flags);
1911 if (ev1 < mddev->events)
1912 /* just a hot-add of a new device, leave raid_disk at -1 */
1915 if (mddev->level != LEVEL_MULTIPATH) {
1917 if (rdev->desc_nr < 0 ||
1918 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1919 role = MD_DISK_ROLE_SPARE;
1922 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1924 case MD_DISK_ROLE_SPARE: /* spare */
1926 case MD_DISK_ROLE_FAULTY: /* faulty */
1927 set_bit(Faulty, &rdev->flags);
1929 case MD_DISK_ROLE_JOURNAL: /* journal device */
1930 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1931 /* journal device without journal feature */
1932 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1935 set_bit(Journal, &rdev->flags);
1936 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1937 rdev->raid_disk = 0;
1940 rdev->saved_raid_disk = role;
1941 if ((le32_to_cpu(sb->feature_map) &
1942 MD_FEATURE_RECOVERY_OFFSET)) {
1943 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1944 if (!(le32_to_cpu(sb->feature_map) &
1945 MD_FEATURE_RECOVERY_BITMAP))
1946 rdev->saved_raid_disk = -1;
1949 * If the array is FROZEN, then the device can't
1950 * be in_sync with rest of array.
1952 if (!test_bit(MD_RECOVERY_FROZEN,
1954 set_bit(In_sync, &rdev->flags);
1956 rdev->raid_disk = role;
1959 if (sb->devflags & WriteMostly1)
1960 set_bit(WriteMostly, &rdev->flags);
1961 if (sb->devflags & FailFast1)
1962 set_bit(FailFast, &rdev->flags);
1963 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1964 set_bit(Replacement, &rdev->flags);
1965 } else /* MULTIPATH are always insync */
1966 set_bit(In_sync, &rdev->flags);
1971 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1973 struct mdp_superblock_1 *sb;
1974 struct md_rdev *rdev2;
1976 /* make rdev->sb match mddev and rdev data. */
1978 sb = page_address(rdev->sb_page);
1980 sb->feature_map = 0;
1982 sb->recovery_offset = cpu_to_le64(0);
1983 memset(sb->pad3, 0, sizeof(sb->pad3));
1985 sb->utime = cpu_to_le64((__u64)mddev->utime);
1986 sb->events = cpu_to_le64(mddev->events);
1988 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1989 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1990 sb->resync_offset = cpu_to_le64(MaxSector);
1992 sb->resync_offset = cpu_to_le64(0);
1994 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1996 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1997 sb->size = cpu_to_le64(mddev->dev_sectors);
1998 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1999 sb->level = cpu_to_le32(mddev->level);
2000 sb->layout = cpu_to_le32(mddev->layout);
2001 if (test_bit(FailFast, &rdev->flags))
2002 sb->devflags |= FailFast1;
2004 sb->devflags &= ~FailFast1;
2006 if (test_bit(WriteMostly, &rdev->flags))
2007 sb->devflags |= WriteMostly1;
2009 sb->devflags &= ~WriteMostly1;
2010 sb->data_offset = cpu_to_le64(rdev->data_offset);
2011 sb->data_size = cpu_to_le64(rdev->sectors);
2013 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2014 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2015 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2018 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2019 !test_bit(In_sync, &rdev->flags)) {
2021 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2022 sb->recovery_offset =
2023 cpu_to_le64(rdev->recovery_offset);
2024 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2026 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2028 /* Note: recovery_offset and journal_tail share space */
2029 if (test_bit(Journal, &rdev->flags))
2030 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2031 if (test_bit(Replacement, &rdev->flags))
2033 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2035 if (mddev->reshape_position != MaxSector) {
2036 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2037 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2038 sb->new_layout = cpu_to_le32(mddev->new_layout);
2039 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2040 sb->new_level = cpu_to_le32(mddev->new_level);
2041 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2042 if (mddev->delta_disks == 0 &&
2043 mddev->reshape_backwards)
2045 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2046 if (rdev->new_data_offset != rdev->data_offset) {
2048 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2049 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2050 - rdev->data_offset));
2054 if (mddev_is_clustered(mddev))
2055 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2057 if (rdev->badblocks.count == 0)
2058 /* Nothing to do for bad blocks*/ ;
2059 else if (sb->bblog_offset == 0)
2060 /* Cannot record bad blocks on this device */
2061 md_error(mddev, rdev);
2063 struct badblocks *bb = &rdev->badblocks;
2064 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2066 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2071 seq = read_seqbegin(&bb->lock);
2073 memset(bbp, 0xff, PAGE_SIZE);
2075 for (i = 0 ; i < bb->count ; i++) {
2076 u64 internal_bb = p[i];
2077 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2078 | BB_LEN(internal_bb));
2079 bbp[i] = cpu_to_le64(store_bb);
2082 if (read_seqretry(&bb->lock, seq))
2085 bb->sector = (rdev->sb_start +
2086 (int)le32_to_cpu(sb->bblog_offset));
2087 bb->size = le16_to_cpu(sb->bblog_size);
2092 rdev_for_each(rdev2, mddev)
2093 if (rdev2->desc_nr+1 > max_dev)
2094 max_dev = rdev2->desc_nr+1;
2096 if (max_dev > le32_to_cpu(sb->max_dev)) {
2098 sb->max_dev = cpu_to_le32(max_dev);
2099 rdev->sb_size = max_dev * 2 + 256;
2100 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2101 if (rdev->sb_size & bmask)
2102 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2104 max_dev = le32_to_cpu(sb->max_dev);
2106 for (i=0; i<max_dev;i++)
2107 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2109 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2110 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2112 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2113 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2115 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2117 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2118 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2119 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2122 rdev_for_each(rdev2, mddev) {
2124 if (test_bit(Faulty, &rdev2->flags))
2125 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2126 else if (test_bit(In_sync, &rdev2->flags))
2127 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2128 else if (test_bit(Journal, &rdev2->flags))
2129 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2130 else if (rdev2->raid_disk >= 0)
2131 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2133 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2136 sb->sb_csum = calc_sb_1_csum(sb);
2139 static sector_t super_1_choose_bm_space(sector_t dev_size)
2143 /* if the device is bigger than 8Gig, save 64k for bitmap
2144 * usage, if bigger than 200Gig, save 128k
2146 if (dev_size < 64*2)
2148 else if (dev_size - 64*2 >= 200*1024*1024*2)
2150 else if (dev_size - 4*2 > 8*1024*1024*2)
2157 static unsigned long long
2158 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2160 struct mdp_superblock_1 *sb;
2161 sector_t max_sectors;
2162 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2163 return 0; /* component must fit device */
2164 if (rdev->data_offset != rdev->new_data_offset)
2165 return 0; /* too confusing */
2166 if (rdev->sb_start < rdev->data_offset) {
2167 /* minor versions 1 and 2; superblock before data */
2168 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2169 if (!num_sectors || num_sectors > max_sectors)
2170 num_sectors = max_sectors;
2171 } else if (rdev->mddev->bitmap_info.offset) {
2172 /* minor version 0 with bitmap we can't move */
2175 /* minor version 0; superblock after data */
2176 sector_t sb_start, bm_space;
2177 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2179 /* 8K is for superblock */
2180 sb_start = dev_size - 8*2;
2181 sb_start &= ~(sector_t)(4*2 - 1);
2183 bm_space = super_1_choose_bm_space(dev_size);
2185 /* Space that can be used to store date needs to decrease
2186 * superblock bitmap space and bad block space(4K)
2188 max_sectors = sb_start - bm_space - 4*2;
2190 if (!num_sectors || num_sectors > max_sectors)
2191 num_sectors = max_sectors;
2192 rdev->sb_start = sb_start;
2194 sb = page_address(rdev->sb_page);
2195 sb->data_size = cpu_to_le64(num_sectors);
2196 sb->super_offset = cpu_to_le64(rdev->sb_start);
2197 sb->sb_csum = calc_sb_1_csum(sb);
2199 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2201 } while (md_super_wait(rdev->mddev) < 0);
2207 super_1_allow_new_offset(struct md_rdev *rdev,
2208 unsigned long long new_offset)
2210 /* All necessary checks on new >= old have been done */
2211 struct bitmap *bitmap;
2212 if (new_offset >= rdev->data_offset)
2215 /* with 1.0 metadata, there is no metadata to tread on
2216 * so we can always move back */
2217 if (rdev->mddev->minor_version == 0)
2220 /* otherwise we must be sure not to step on
2221 * any metadata, so stay:
2222 * 36K beyond start of superblock
2223 * beyond end of badblocks
2224 * beyond write-intent bitmap
2226 if (rdev->sb_start + (32+4)*2 > new_offset)
2228 bitmap = rdev->mddev->bitmap;
2229 if (bitmap && !rdev->mddev->bitmap_info.file &&
2230 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2231 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2233 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2239 static struct super_type super_types[] = {
2242 .owner = THIS_MODULE,
2243 .load_super = super_90_load,
2244 .validate_super = super_90_validate,
2245 .sync_super = super_90_sync,
2246 .rdev_size_change = super_90_rdev_size_change,
2247 .allow_new_offset = super_90_allow_new_offset,
2251 .owner = THIS_MODULE,
2252 .load_super = super_1_load,
2253 .validate_super = super_1_validate,
2254 .sync_super = super_1_sync,
2255 .rdev_size_change = super_1_rdev_size_change,
2256 .allow_new_offset = super_1_allow_new_offset,
2260 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2262 if (mddev->sync_super) {
2263 mddev->sync_super(mddev, rdev);
2267 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2269 super_types[mddev->major_version].sync_super(mddev, rdev);
2272 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2274 struct md_rdev *rdev, *rdev2;
2277 rdev_for_each_rcu(rdev, mddev1) {
2278 if (test_bit(Faulty, &rdev->flags) ||
2279 test_bit(Journal, &rdev->flags) ||
2280 rdev->raid_disk == -1)
2282 rdev_for_each_rcu(rdev2, mddev2) {
2283 if (test_bit(Faulty, &rdev2->flags) ||
2284 test_bit(Journal, &rdev2->flags) ||
2285 rdev2->raid_disk == -1)
2287 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2297 static LIST_HEAD(pending_raid_disks);
2300 * Try to register data integrity profile for an mddev
2302 * This is called when an array is started and after a disk has been kicked
2303 * from the array. It only succeeds if all working and active component devices
2304 * are integrity capable with matching profiles.
2306 int md_integrity_register(struct mddev *mddev)
2308 struct md_rdev *rdev, *reference = NULL;
2310 if (list_empty(&mddev->disks))
2311 return 0; /* nothing to do */
2312 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2313 return 0; /* shouldn't register, or already is */
2314 rdev_for_each(rdev, mddev) {
2315 /* skip spares and non-functional disks */
2316 if (test_bit(Faulty, &rdev->flags))
2318 if (rdev->raid_disk < 0)
2321 /* Use the first rdev as the reference */
2325 /* does this rdev's profile match the reference profile? */
2326 if (blk_integrity_compare(reference->bdev->bd_disk,
2327 rdev->bdev->bd_disk) < 0)
2330 if (!reference || !bdev_get_integrity(reference->bdev))
2333 * All component devices are integrity capable and have matching
2334 * profiles, register the common profile for the md device.
2336 blk_integrity_register(mddev->gendisk,
2337 bdev_get_integrity(reference->bdev));
2339 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2340 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2341 (mddev->level != 1 && mddev->level != 10 &&
2342 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2344 * No need to handle the failure of bioset_integrity_create,
2345 * because the function is called by md_run() -> pers->run(),
2346 * md_run calls bioset_exit -> bioset_integrity_free in case
2349 pr_err("md: failed to create integrity pool for %s\n",
2355 EXPORT_SYMBOL(md_integrity_register);
2358 * Attempt to add an rdev, but only if it is consistent with the current
2361 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2363 struct blk_integrity *bi_mddev;
2365 if (!mddev->gendisk)
2368 bi_mddev = blk_get_integrity(mddev->gendisk);
2370 if (!bi_mddev) /* nothing to do */
2373 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2374 pr_err("%s: incompatible integrity profile for %pg\n",
2375 mdname(mddev), rdev->bdev);
2381 EXPORT_SYMBOL(md_integrity_add_rdev);
2383 static bool rdev_read_only(struct md_rdev *rdev)
2385 return bdev_read_only(rdev->bdev) ||
2386 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2389 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2391 char b[BDEVNAME_SIZE];
2394 /* prevent duplicates */
2395 if (find_rdev(mddev, rdev->bdev->bd_dev))
2398 if (rdev_read_only(rdev) && mddev->pers)
2401 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2402 if (!test_bit(Journal, &rdev->flags) &&
2404 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2406 /* Cannot change size, so fail
2407 * If mddev->level <= 0, then we don't care
2408 * about aligning sizes (e.g. linear)
2410 if (mddev->level > 0)
2413 mddev->dev_sectors = rdev->sectors;
2416 /* Verify rdev->desc_nr is unique.
2417 * If it is -1, assign a free number, else
2418 * check number is not in use
2421 if (rdev->desc_nr < 0) {
2424 choice = mddev->raid_disks;
2425 while (md_find_rdev_nr_rcu(mddev, choice))
2427 rdev->desc_nr = choice;
2429 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2435 if (!test_bit(Journal, &rdev->flags) &&
2436 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2437 pr_warn("md: %s: array is limited to %d devices\n",
2438 mdname(mddev), mddev->max_disks);
2441 bdevname(rdev->bdev,b);
2442 strreplace(b, '/', '!');
2444 rdev->mddev = mddev;
2445 pr_debug("md: bind<%s>\n", b);
2447 if (mddev->raid_disks)
2448 mddev_create_serial_pool(mddev, rdev, false);
2450 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2453 /* failure here is OK */
2454 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2455 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2456 rdev->sysfs_unack_badblocks =
2457 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2458 rdev->sysfs_badblocks =
2459 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2461 list_add_rcu(&rdev->same_set, &mddev->disks);
2462 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2464 /* May as well allow recovery to be retried once */
2465 mddev->recovery_disabled++;
2470 pr_warn("md: failed to register dev-%s for %s\n",
2475 static void rdev_delayed_delete(struct work_struct *ws)
2477 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2478 kobject_del(&rdev->kobj);
2479 kobject_put(&rdev->kobj);
2482 static void unbind_rdev_from_array(struct md_rdev *rdev)
2484 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2485 list_del_rcu(&rdev->same_set);
2486 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2487 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2489 sysfs_remove_link(&rdev->kobj, "block");
2490 sysfs_put(rdev->sysfs_state);
2491 sysfs_put(rdev->sysfs_unack_badblocks);
2492 sysfs_put(rdev->sysfs_badblocks);
2493 rdev->sysfs_state = NULL;
2494 rdev->sysfs_unack_badblocks = NULL;
2495 rdev->sysfs_badblocks = NULL;
2496 rdev->badblocks.count = 0;
2497 /* We need to delay this, otherwise we can deadlock when
2498 * writing to 'remove' to "dev/state". We also need
2499 * to delay it due to rcu usage.
2502 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2503 kobject_get(&rdev->kobj);
2504 queue_work(md_rdev_misc_wq, &rdev->del_work);
2508 * prevent the device from being mounted, repartitioned or
2509 * otherwise reused by a RAID array (or any other kernel
2510 * subsystem), by bd_claiming the device.
2512 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2515 struct block_device *bdev;
2517 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2518 shared ? (struct md_rdev *)lock_rdev : rdev);
2520 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2521 MAJOR(dev), MINOR(dev));
2522 return PTR_ERR(bdev);
2528 static void unlock_rdev(struct md_rdev *rdev)
2530 struct block_device *bdev = rdev->bdev;
2532 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2535 void md_autodetect_dev(dev_t dev);
2537 static void export_rdev(struct md_rdev *rdev)
2539 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2540 md_rdev_clear(rdev);
2542 if (test_bit(AutoDetected, &rdev->flags))
2543 md_autodetect_dev(rdev->bdev->bd_dev);
2546 kobject_put(&rdev->kobj);
2549 void md_kick_rdev_from_array(struct md_rdev *rdev)
2551 unbind_rdev_from_array(rdev);
2554 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2556 static void export_array(struct mddev *mddev)
2558 struct md_rdev *rdev;
2560 while (!list_empty(&mddev->disks)) {
2561 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2563 md_kick_rdev_from_array(rdev);
2565 mddev->raid_disks = 0;
2566 mddev->major_version = 0;
2569 static bool set_in_sync(struct mddev *mddev)
2571 lockdep_assert_held(&mddev->lock);
2572 if (!mddev->in_sync) {
2573 mddev->sync_checkers++;
2574 spin_unlock(&mddev->lock);
2575 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2576 spin_lock(&mddev->lock);
2577 if (!mddev->in_sync &&
2578 percpu_ref_is_zero(&mddev->writes_pending)) {
2581 * Ensure ->in_sync is visible before we clear
2585 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2586 sysfs_notify_dirent_safe(mddev->sysfs_state);
2588 if (--mddev->sync_checkers == 0)
2589 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2591 if (mddev->safemode == 1)
2592 mddev->safemode = 0;
2593 return mddev->in_sync;
2596 static void sync_sbs(struct mddev *mddev, int nospares)
2598 /* Update each superblock (in-memory image), but
2599 * if we are allowed to, skip spares which already
2600 * have the right event counter, or have one earlier
2601 * (which would mean they aren't being marked as dirty
2602 * with the rest of the array)
2604 struct md_rdev *rdev;
2605 rdev_for_each(rdev, mddev) {
2606 if (rdev->sb_events == mddev->events ||
2608 rdev->raid_disk < 0 &&
2609 rdev->sb_events+1 == mddev->events)) {
2610 /* Don't update this superblock */
2611 rdev->sb_loaded = 2;
2613 sync_super(mddev, rdev);
2614 rdev->sb_loaded = 1;
2619 static bool does_sb_need_changing(struct mddev *mddev)
2621 struct md_rdev *rdev = NULL, *iter;
2622 struct mdp_superblock_1 *sb;
2625 /* Find a good rdev */
2626 rdev_for_each(iter, mddev)
2627 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2632 /* No good device found. */
2636 sb = page_address(rdev->sb_page);
2637 /* Check if a device has become faulty or a spare become active */
2638 rdev_for_each(rdev, mddev) {
2639 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2640 /* Device activated? */
2641 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2642 !test_bit(Faulty, &rdev->flags))
2644 /* Device turned faulty? */
2645 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2649 /* Check if any mddev parameters have changed */
2650 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2651 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2652 (mddev->layout != le32_to_cpu(sb->layout)) ||
2653 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2654 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2660 void md_update_sb(struct mddev *mddev, int force_change)
2662 struct md_rdev *rdev;
2665 int any_badblocks_changed = 0;
2670 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2675 if (mddev_is_clustered(mddev)) {
2676 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2678 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2680 ret = md_cluster_ops->metadata_update_start(mddev);
2681 /* Has someone else has updated the sb */
2682 if (!does_sb_need_changing(mddev)) {
2684 md_cluster_ops->metadata_update_cancel(mddev);
2685 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2686 BIT(MD_SB_CHANGE_DEVS) |
2687 BIT(MD_SB_CHANGE_CLEAN));
2693 * First make sure individual recovery_offsets are correct
2694 * curr_resync_completed can only be used during recovery.
2695 * During reshape/resync it might use array-addresses rather
2696 * that device addresses.
2698 rdev_for_each(rdev, mddev) {
2699 if (rdev->raid_disk >= 0 &&
2700 mddev->delta_disks >= 0 &&
2701 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2702 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2703 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2704 !test_bit(Journal, &rdev->flags) &&
2705 !test_bit(In_sync, &rdev->flags) &&
2706 mddev->curr_resync_completed > rdev->recovery_offset)
2707 rdev->recovery_offset = mddev->curr_resync_completed;
2710 if (!mddev->persistent) {
2711 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2712 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2713 if (!mddev->external) {
2714 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2715 rdev_for_each(rdev, mddev) {
2716 if (rdev->badblocks.changed) {
2717 rdev->badblocks.changed = 0;
2718 ack_all_badblocks(&rdev->badblocks);
2719 md_error(mddev, rdev);
2721 clear_bit(Blocked, &rdev->flags);
2722 clear_bit(BlockedBadBlocks, &rdev->flags);
2723 wake_up(&rdev->blocked_wait);
2726 wake_up(&mddev->sb_wait);
2730 spin_lock(&mddev->lock);
2732 mddev->utime = ktime_get_real_seconds();
2734 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2736 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2737 /* just a clean<-> dirty transition, possibly leave spares alone,
2738 * though if events isn't the right even/odd, we will have to do
2744 if (mddev->degraded)
2745 /* If the array is degraded, then skipping spares is both
2746 * dangerous and fairly pointless.
2747 * Dangerous because a device that was removed from the array
2748 * might have a event_count that still looks up-to-date,
2749 * so it can be re-added without a resync.
2750 * Pointless because if there are any spares to skip,
2751 * then a recovery will happen and soon that array won't
2752 * be degraded any more and the spare can go back to sleep then.
2756 sync_req = mddev->in_sync;
2758 /* If this is just a dirty<->clean transition, and the array is clean
2759 * and 'events' is odd, we can roll back to the previous clean state */
2761 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2762 && mddev->can_decrease_events
2763 && mddev->events != 1) {
2765 mddev->can_decrease_events = 0;
2767 /* otherwise we have to go forward and ... */
2769 mddev->can_decrease_events = nospares;
2773 * This 64-bit counter should never wrap.
2774 * Either we are in around ~1 trillion A.C., assuming
2775 * 1 reboot per second, or we have a bug...
2777 WARN_ON(mddev->events == 0);
2779 rdev_for_each(rdev, mddev) {
2780 if (rdev->badblocks.changed)
2781 any_badblocks_changed++;
2782 if (test_bit(Faulty, &rdev->flags))
2783 set_bit(FaultRecorded, &rdev->flags);
2786 sync_sbs(mddev, nospares);
2787 spin_unlock(&mddev->lock);
2789 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2790 mdname(mddev), mddev->in_sync);
2793 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2795 md_bitmap_update_sb(mddev->bitmap);
2796 rdev_for_each(rdev, mddev) {
2797 if (rdev->sb_loaded != 1)
2798 continue; /* no noise on spare devices */
2800 if (!test_bit(Faulty, &rdev->flags)) {
2801 md_super_write(mddev,rdev,
2802 rdev->sb_start, rdev->sb_size,
2804 pr_debug("md: (write) %pg's sb offset: %llu\n",
2806 (unsigned long long)rdev->sb_start);
2807 rdev->sb_events = mddev->events;
2808 if (rdev->badblocks.size) {
2809 md_super_write(mddev, rdev,
2810 rdev->badblocks.sector,
2811 rdev->badblocks.size << 9,
2813 rdev->badblocks.size = 0;
2817 pr_debug("md: %pg (skipping faulty)\n",
2820 if (mddev->level == LEVEL_MULTIPATH)
2821 /* only need to write one superblock... */
2824 if (md_super_wait(mddev) < 0)
2826 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2828 if (mddev_is_clustered(mddev) && ret == 0)
2829 md_cluster_ops->metadata_update_finish(mddev);
2831 if (mddev->in_sync != sync_req ||
2832 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2833 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2834 /* have to write it out again */
2836 wake_up(&mddev->sb_wait);
2837 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2838 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2840 rdev_for_each(rdev, mddev) {
2841 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2842 clear_bit(Blocked, &rdev->flags);
2844 if (any_badblocks_changed)
2845 ack_all_badblocks(&rdev->badblocks);
2846 clear_bit(BlockedBadBlocks, &rdev->flags);
2847 wake_up(&rdev->blocked_wait);
2850 EXPORT_SYMBOL(md_update_sb);
2852 static int add_bound_rdev(struct md_rdev *rdev)
2854 struct mddev *mddev = rdev->mddev;
2856 bool add_journal = test_bit(Journal, &rdev->flags);
2858 if (!mddev->pers->hot_remove_disk || add_journal) {
2859 /* If there is hot_add_disk but no hot_remove_disk
2860 * then added disks for geometry changes,
2861 * and should be added immediately.
2863 super_types[mddev->major_version].
2864 validate_super(mddev, rdev);
2866 mddev_suspend(mddev);
2867 err = mddev->pers->hot_add_disk(mddev, rdev);
2869 mddev_resume(mddev);
2871 md_kick_rdev_from_array(rdev);
2875 sysfs_notify_dirent_safe(rdev->sysfs_state);
2877 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2878 if (mddev->degraded)
2879 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2880 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2882 md_wakeup_thread(mddev->thread);
2886 /* words written to sysfs files may, or may not, be \n terminated.
2887 * We want to accept with case. For this we use cmd_match.
2889 static int cmd_match(const char *cmd, const char *str)
2891 /* See if cmd, written into a sysfs file, matches
2892 * str. They must either be the same, or cmd can
2893 * have a trailing newline
2895 while (*cmd && *str && *cmd == *str) {
2906 struct rdev_sysfs_entry {
2907 struct attribute attr;
2908 ssize_t (*show)(struct md_rdev *, char *);
2909 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2913 state_show(struct md_rdev *rdev, char *page)
2917 unsigned long flags = READ_ONCE(rdev->flags);
2919 if (test_bit(Faulty, &flags) ||
2920 (!test_bit(ExternalBbl, &flags) &&
2921 rdev->badblocks.unacked_exist))
2922 len += sprintf(page+len, "faulty%s", sep);
2923 if (test_bit(In_sync, &flags))
2924 len += sprintf(page+len, "in_sync%s", sep);
2925 if (test_bit(Journal, &flags))
2926 len += sprintf(page+len, "journal%s", sep);
2927 if (test_bit(WriteMostly, &flags))
2928 len += sprintf(page+len, "write_mostly%s", sep);
2929 if (test_bit(Blocked, &flags) ||
2930 (rdev->badblocks.unacked_exist
2931 && !test_bit(Faulty, &flags)))
2932 len += sprintf(page+len, "blocked%s", sep);
2933 if (!test_bit(Faulty, &flags) &&
2934 !test_bit(Journal, &flags) &&
2935 !test_bit(In_sync, &flags))
2936 len += sprintf(page+len, "spare%s", sep);
2937 if (test_bit(WriteErrorSeen, &flags))
2938 len += sprintf(page+len, "write_error%s", sep);
2939 if (test_bit(WantReplacement, &flags))
2940 len += sprintf(page+len, "want_replacement%s", sep);
2941 if (test_bit(Replacement, &flags))
2942 len += sprintf(page+len, "replacement%s", sep);
2943 if (test_bit(ExternalBbl, &flags))
2944 len += sprintf(page+len, "external_bbl%s", sep);
2945 if (test_bit(FailFast, &flags))
2946 len += sprintf(page+len, "failfast%s", sep);
2951 return len+sprintf(page+len, "\n");
2955 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2958 * faulty - simulates an error
2959 * remove - disconnects the device
2960 * writemostly - sets write_mostly
2961 * -writemostly - clears write_mostly
2962 * blocked - sets the Blocked flags
2963 * -blocked - clears the Blocked and possibly simulates an error
2964 * insync - sets Insync providing device isn't active
2965 * -insync - clear Insync for a device with a slot assigned,
2966 * so that it gets rebuilt based on bitmap
2967 * write_error - sets WriteErrorSeen
2968 * -write_error - clears WriteErrorSeen
2969 * {,-}failfast - set/clear FailFast
2972 struct mddev *mddev = rdev->mddev;
2974 bool need_update_sb = false;
2976 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2977 md_error(rdev->mddev, rdev);
2979 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
2983 } else if (cmd_match(buf, "remove")) {
2984 if (rdev->mddev->pers) {
2985 clear_bit(Blocked, &rdev->flags);
2986 remove_and_add_spares(rdev->mddev, rdev);
2988 if (rdev->raid_disk >= 0)
2992 if (mddev_is_clustered(mddev))
2993 err = md_cluster_ops->remove_disk(mddev, rdev);
2996 md_kick_rdev_from_array(rdev);
2998 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2999 md_wakeup_thread(mddev->thread);
3004 } else if (cmd_match(buf, "writemostly")) {
3005 set_bit(WriteMostly, &rdev->flags);
3006 mddev_create_serial_pool(rdev->mddev, rdev, false);
3007 need_update_sb = true;
3009 } else if (cmd_match(buf, "-writemostly")) {
3010 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3011 clear_bit(WriteMostly, &rdev->flags);
3012 need_update_sb = true;
3014 } else if (cmd_match(buf, "blocked")) {
3015 set_bit(Blocked, &rdev->flags);
3017 } else if (cmd_match(buf, "-blocked")) {
3018 if (!test_bit(Faulty, &rdev->flags) &&
3019 !test_bit(ExternalBbl, &rdev->flags) &&
3020 rdev->badblocks.unacked_exist) {
3021 /* metadata handler doesn't understand badblocks,
3022 * so we need to fail the device
3024 md_error(rdev->mddev, rdev);
3026 clear_bit(Blocked, &rdev->flags);
3027 clear_bit(BlockedBadBlocks, &rdev->flags);
3028 wake_up(&rdev->blocked_wait);
3029 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3030 md_wakeup_thread(rdev->mddev->thread);
3033 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3034 set_bit(In_sync, &rdev->flags);
3036 } else if (cmd_match(buf, "failfast")) {
3037 set_bit(FailFast, &rdev->flags);
3038 need_update_sb = true;
3040 } else if (cmd_match(buf, "-failfast")) {
3041 clear_bit(FailFast, &rdev->flags);
3042 need_update_sb = true;
3044 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3045 !test_bit(Journal, &rdev->flags)) {
3046 if (rdev->mddev->pers == NULL) {
3047 clear_bit(In_sync, &rdev->flags);
3048 rdev->saved_raid_disk = rdev->raid_disk;
3049 rdev->raid_disk = -1;
3052 } else if (cmd_match(buf, "write_error")) {
3053 set_bit(WriteErrorSeen, &rdev->flags);
3055 } else if (cmd_match(buf, "-write_error")) {
3056 clear_bit(WriteErrorSeen, &rdev->flags);
3058 } else if (cmd_match(buf, "want_replacement")) {
3059 /* Any non-spare device that is not a replacement can
3060 * become want_replacement at any time, but we then need to
3061 * check if recovery is needed.
3063 if (rdev->raid_disk >= 0 &&
3064 !test_bit(Journal, &rdev->flags) &&
3065 !test_bit(Replacement, &rdev->flags))
3066 set_bit(WantReplacement, &rdev->flags);
3067 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3068 md_wakeup_thread(rdev->mddev->thread);
3070 } else if (cmd_match(buf, "-want_replacement")) {
3071 /* Clearing 'want_replacement' is always allowed.
3072 * Once replacements starts it is too late though.
3075 clear_bit(WantReplacement, &rdev->flags);
3076 } else if (cmd_match(buf, "replacement")) {
3077 /* Can only set a device as a replacement when array has not
3078 * yet been started. Once running, replacement is automatic
3079 * from spares, or by assigning 'slot'.
3081 if (rdev->mddev->pers)
3084 set_bit(Replacement, &rdev->flags);
3087 } else if (cmd_match(buf, "-replacement")) {
3088 /* Similarly, can only clear Replacement before start */
3089 if (rdev->mddev->pers)
3092 clear_bit(Replacement, &rdev->flags);
3095 } else if (cmd_match(buf, "re-add")) {
3096 if (!rdev->mddev->pers)
3098 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3099 rdev->saved_raid_disk >= 0) {
3100 /* clear_bit is performed _after_ all the devices
3101 * have their local Faulty bit cleared. If any writes
3102 * happen in the meantime in the local node, they
3103 * will land in the local bitmap, which will be synced
3104 * by this node eventually
3106 if (!mddev_is_clustered(rdev->mddev) ||
3107 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3108 clear_bit(Faulty, &rdev->flags);
3109 err = add_bound_rdev(rdev);
3113 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3114 set_bit(ExternalBbl, &rdev->flags);
3115 rdev->badblocks.shift = 0;
3117 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3118 clear_bit(ExternalBbl, &rdev->flags);
3122 md_update_sb(mddev, 1);
3124 sysfs_notify_dirent_safe(rdev->sysfs_state);
3125 return err ? err : len;
3127 static struct rdev_sysfs_entry rdev_state =
3128 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3131 errors_show(struct md_rdev *rdev, char *page)
3133 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3137 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3142 rv = kstrtouint(buf, 10, &n);
3145 atomic_set(&rdev->corrected_errors, n);
3148 static struct rdev_sysfs_entry rdev_errors =
3149 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3152 slot_show(struct md_rdev *rdev, char *page)
3154 if (test_bit(Journal, &rdev->flags))
3155 return sprintf(page, "journal\n");
3156 else if (rdev->raid_disk < 0)
3157 return sprintf(page, "none\n");
3159 return sprintf(page, "%d\n", rdev->raid_disk);
3163 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3168 if (test_bit(Journal, &rdev->flags))
3170 if (strncmp(buf, "none", 4)==0)
3173 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3177 if (rdev->mddev->pers && slot == -1) {
3178 /* Setting 'slot' on an active array requires also
3179 * updating the 'rd%d' link, and communicating
3180 * with the personality with ->hot_*_disk.
3181 * For now we only support removing
3182 * failed/spare devices. This normally happens automatically,
3183 * but not when the metadata is externally managed.
3185 if (rdev->raid_disk == -1)
3187 /* personality does all needed checks */
3188 if (rdev->mddev->pers->hot_remove_disk == NULL)
3190 clear_bit(Blocked, &rdev->flags);
3191 remove_and_add_spares(rdev->mddev, rdev);
3192 if (rdev->raid_disk >= 0)
3194 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3195 md_wakeup_thread(rdev->mddev->thread);
3196 } else if (rdev->mddev->pers) {
3197 /* Activating a spare .. or possibly reactivating
3198 * if we ever get bitmaps working here.
3202 if (rdev->raid_disk != -1)
3205 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3208 if (rdev->mddev->pers->hot_add_disk == NULL)
3211 if (slot >= rdev->mddev->raid_disks &&
3212 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3215 rdev->raid_disk = slot;
3216 if (test_bit(In_sync, &rdev->flags))
3217 rdev->saved_raid_disk = slot;
3219 rdev->saved_raid_disk = -1;
3220 clear_bit(In_sync, &rdev->flags);
3221 clear_bit(Bitmap_sync, &rdev->flags);
3222 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3224 rdev->raid_disk = -1;
3227 sysfs_notify_dirent_safe(rdev->sysfs_state);
3228 /* failure here is OK */;
3229 sysfs_link_rdev(rdev->mddev, rdev);
3230 /* don't wakeup anyone, leave that to userspace. */
3232 if (slot >= rdev->mddev->raid_disks &&
3233 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3235 rdev->raid_disk = slot;
3236 /* assume it is working */
3237 clear_bit(Faulty, &rdev->flags);
3238 clear_bit(WriteMostly, &rdev->flags);
3239 set_bit(In_sync, &rdev->flags);
3240 sysfs_notify_dirent_safe(rdev->sysfs_state);
3245 static struct rdev_sysfs_entry rdev_slot =
3246 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3249 offset_show(struct md_rdev *rdev, char *page)
3251 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3255 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3257 unsigned long long offset;
3258 if (kstrtoull(buf, 10, &offset) < 0)
3260 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3262 if (rdev->sectors && rdev->mddev->external)
3263 /* Must set offset before size, so overlap checks
3266 rdev->data_offset = offset;
3267 rdev->new_data_offset = offset;
3271 static struct rdev_sysfs_entry rdev_offset =
3272 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3274 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3276 return sprintf(page, "%llu\n",
3277 (unsigned long long)rdev->new_data_offset);
3280 static ssize_t new_offset_store(struct md_rdev *rdev,
3281 const char *buf, size_t len)
3283 unsigned long long new_offset;
3284 struct mddev *mddev = rdev->mddev;
3286 if (kstrtoull(buf, 10, &new_offset) < 0)
3289 if (mddev->sync_thread ||
3290 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3292 if (new_offset == rdev->data_offset)
3293 /* reset is always permitted */
3295 else if (new_offset > rdev->data_offset) {
3296 /* must not push array size beyond rdev_sectors */
3297 if (new_offset - rdev->data_offset
3298 + mddev->dev_sectors > rdev->sectors)
3301 /* Metadata worries about other space details. */
3303 /* decreasing the offset is inconsistent with a backwards
3306 if (new_offset < rdev->data_offset &&
3307 mddev->reshape_backwards)
3309 /* Increasing offset is inconsistent with forwards
3310 * reshape. reshape_direction should be set to
3311 * 'backwards' first.
3313 if (new_offset > rdev->data_offset &&
3314 !mddev->reshape_backwards)
3317 if (mddev->pers && mddev->persistent &&
3318 !super_types[mddev->major_version]
3319 .allow_new_offset(rdev, new_offset))
3321 rdev->new_data_offset = new_offset;
3322 if (new_offset > rdev->data_offset)
3323 mddev->reshape_backwards = 1;
3324 else if (new_offset < rdev->data_offset)
3325 mddev->reshape_backwards = 0;
3329 static struct rdev_sysfs_entry rdev_new_offset =
3330 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3333 rdev_size_show(struct md_rdev *rdev, char *page)
3335 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3338 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3340 /* check if two start/length pairs overlap */
3348 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3350 unsigned long long blocks;
3353 if (kstrtoull(buf, 10, &blocks) < 0)
3356 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3357 return -EINVAL; /* sector conversion overflow */
3360 if (new != blocks * 2)
3361 return -EINVAL; /* unsigned long long to sector_t overflow */
3368 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3370 struct mddev *my_mddev = rdev->mddev;
3371 sector_t oldsectors = rdev->sectors;
3374 if (test_bit(Journal, &rdev->flags))
3376 if (strict_blocks_to_sectors(buf, §ors) < 0)
3378 if (rdev->data_offset != rdev->new_data_offset)
3379 return -EINVAL; /* too confusing */
3380 if (my_mddev->pers && rdev->raid_disk >= 0) {
3381 if (my_mddev->persistent) {
3382 sectors = super_types[my_mddev->major_version].
3383 rdev_size_change(rdev, sectors);
3386 } else if (!sectors)
3387 sectors = bdev_nr_sectors(rdev->bdev) -
3389 if (!my_mddev->pers->resize)
3390 /* Cannot change size for RAID0 or Linear etc */
3393 if (sectors < my_mddev->dev_sectors)
3394 return -EINVAL; /* component must fit device */
3396 rdev->sectors = sectors;
3397 if (sectors > oldsectors && my_mddev->external) {
3398 /* Need to check that all other rdevs with the same
3399 * ->bdev do not overlap. 'rcu' is sufficient to walk
3400 * the rdev lists safely.
3401 * This check does not provide a hard guarantee, it
3402 * just helps avoid dangerous mistakes.
3404 struct mddev *mddev;
3406 struct list_head *tmp;
3409 for_each_mddev(mddev, tmp) {
3410 struct md_rdev *rdev2;
3412 rdev_for_each(rdev2, mddev)
3413 if (rdev->bdev == rdev2->bdev &&
3415 overlaps(rdev->data_offset, rdev->sectors,
3428 /* Someone else could have slipped in a size
3429 * change here, but doing so is just silly.
3430 * We put oldsectors back because we *know* it is
3431 * safe, and trust userspace not to race with
3434 rdev->sectors = oldsectors;
3441 static struct rdev_sysfs_entry rdev_size =
3442 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3444 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3446 unsigned long long recovery_start = rdev->recovery_offset;
3448 if (test_bit(In_sync, &rdev->flags) ||
3449 recovery_start == MaxSector)
3450 return sprintf(page, "none\n");
3452 return sprintf(page, "%llu\n", recovery_start);
3455 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3457 unsigned long long recovery_start;
3459 if (cmd_match(buf, "none"))
3460 recovery_start = MaxSector;
3461 else if (kstrtoull(buf, 10, &recovery_start))
3464 if (rdev->mddev->pers &&
3465 rdev->raid_disk >= 0)
3468 rdev->recovery_offset = recovery_start;
3469 if (recovery_start == MaxSector)
3470 set_bit(In_sync, &rdev->flags);
3472 clear_bit(In_sync, &rdev->flags);
3476 static struct rdev_sysfs_entry rdev_recovery_start =
3477 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3479 /* sysfs access to bad-blocks list.
3480 * We present two files.
3481 * 'bad-blocks' lists sector numbers and lengths of ranges that
3482 * are recorded as bad. The list is truncated to fit within
3483 * the one-page limit of sysfs.
3484 * Writing "sector length" to this file adds an acknowledged
3486 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3487 * been acknowledged. Writing to this file adds bad blocks
3488 * without acknowledging them. This is largely for testing.
3490 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3492 return badblocks_show(&rdev->badblocks, page, 0);
3494 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3496 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3497 /* Maybe that ack was all we needed */
3498 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3499 wake_up(&rdev->blocked_wait);
3502 static struct rdev_sysfs_entry rdev_bad_blocks =
3503 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3505 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3507 return badblocks_show(&rdev->badblocks, page, 1);
3509 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3511 return badblocks_store(&rdev->badblocks, page, len, 1);
3513 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3514 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3517 ppl_sector_show(struct md_rdev *rdev, char *page)
3519 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3523 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3525 unsigned long long sector;
3527 if (kstrtoull(buf, 10, §or) < 0)
3529 if (sector != (sector_t)sector)
3532 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3533 rdev->raid_disk >= 0)
3536 if (rdev->mddev->persistent) {
3537 if (rdev->mddev->major_version == 0)
3539 if ((sector > rdev->sb_start &&
3540 sector - rdev->sb_start > S16_MAX) ||
3541 (sector < rdev->sb_start &&
3542 rdev->sb_start - sector > -S16_MIN))
3544 rdev->ppl.offset = sector - rdev->sb_start;
3545 } else if (!rdev->mddev->external) {
3548 rdev->ppl.sector = sector;
3552 static struct rdev_sysfs_entry rdev_ppl_sector =
3553 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3556 ppl_size_show(struct md_rdev *rdev, char *page)
3558 return sprintf(page, "%u\n", rdev->ppl.size);
3562 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3566 if (kstrtouint(buf, 10, &size) < 0)
3569 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3570 rdev->raid_disk >= 0)
3573 if (rdev->mddev->persistent) {
3574 if (rdev->mddev->major_version == 0)
3578 } else if (!rdev->mddev->external) {
3581 rdev->ppl.size = size;
3585 static struct rdev_sysfs_entry rdev_ppl_size =
3586 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3588 static struct attribute *rdev_default_attrs[] = {
3593 &rdev_new_offset.attr,
3595 &rdev_recovery_start.attr,
3596 &rdev_bad_blocks.attr,
3597 &rdev_unack_bad_blocks.attr,
3598 &rdev_ppl_sector.attr,
3599 &rdev_ppl_size.attr,
3602 ATTRIBUTE_GROUPS(rdev_default);
3604 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3606 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3607 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3613 return entry->show(rdev, page);
3617 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3618 const char *page, size_t length)
3620 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3621 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3623 struct mddev *mddev = rdev->mddev;
3627 if (!capable(CAP_SYS_ADMIN))
3629 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3631 if (rdev->mddev == NULL)
3634 rv = entry->store(rdev, page, length);
3635 mddev_unlock(mddev);
3640 static void rdev_free(struct kobject *ko)
3642 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3645 static const struct sysfs_ops rdev_sysfs_ops = {
3646 .show = rdev_attr_show,
3647 .store = rdev_attr_store,
3649 static struct kobj_type rdev_ktype = {
3650 .release = rdev_free,
3651 .sysfs_ops = &rdev_sysfs_ops,
3652 .default_groups = rdev_default_groups,
3655 int md_rdev_init(struct md_rdev *rdev)
3658 rdev->saved_raid_disk = -1;
3659 rdev->raid_disk = -1;
3661 rdev->data_offset = 0;
3662 rdev->new_data_offset = 0;
3663 rdev->sb_events = 0;
3664 rdev->last_read_error = 0;
3665 rdev->sb_loaded = 0;
3666 rdev->bb_page = NULL;
3667 atomic_set(&rdev->nr_pending, 0);
3668 atomic_set(&rdev->read_errors, 0);
3669 atomic_set(&rdev->corrected_errors, 0);
3671 INIT_LIST_HEAD(&rdev->same_set);
3672 init_waitqueue_head(&rdev->blocked_wait);
3674 /* Add space to store bad block list.
3675 * This reserves the space even on arrays where it cannot
3676 * be used - I wonder if that matters
3678 return badblocks_init(&rdev->badblocks, 0);
3680 EXPORT_SYMBOL_GPL(md_rdev_init);
3682 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3684 * mark the device faulty if:
3686 * - the device is nonexistent (zero size)
3687 * - the device has no valid superblock
3689 * a faulty rdev _never_ has rdev->sb set.
3691 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3694 struct md_rdev *rdev;
3697 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3699 return ERR_PTR(-ENOMEM);
3701 err = md_rdev_init(rdev);
3704 err = alloc_disk_sb(rdev);
3708 err = lock_rdev(rdev, newdev, super_format == -2);
3712 kobject_init(&rdev->kobj, &rdev_ktype);
3714 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3716 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3722 if (super_format >= 0) {
3723 err = super_types[super_format].
3724 load_super(rdev, NULL, super_minor);
3725 if (err == -EINVAL) {
3726 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3728 super_format, super_minor);
3732 pr_warn("md: could not read %pg's sb, not importing!\n",
3743 md_rdev_clear(rdev);
3745 return ERR_PTR(err);
3749 * Check a full RAID array for plausibility
3752 static int analyze_sbs(struct mddev *mddev)
3755 struct md_rdev *rdev, *freshest, *tmp;
3758 rdev_for_each_safe(rdev, tmp, mddev)
3759 switch (super_types[mddev->major_version].
3760 load_super(rdev, freshest, mddev->minor_version)) {
3767 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3769 md_kick_rdev_from_array(rdev);
3772 /* Cannot find a valid fresh disk */
3774 pr_warn("md: cannot find a valid disk\n");
3778 super_types[mddev->major_version].
3779 validate_super(mddev, freshest);
3782 rdev_for_each_safe(rdev, tmp, mddev) {
3783 if (mddev->max_disks &&
3784 (rdev->desc_nr >= mddev->max_disks ||
3785 i > mddev->max_disks)) {
3786 pr_warn("md: %s: %pg: only %d devices permitted\n",
3787 mdname(mddev), rdev->bdev,
3789 md_kick_rdev_from_array(rdev);
3792 if (rdev != freshest) {
3793 if (super_types[mddev->major_version].
3794 validate_super(mddev, rdev)) {
3795 pr_warn("md: kicking non-fresh %pg from array!\n",
3797 md_kick_rdev_from_array(rdev);
3801 if (mddev->level == LEVEL_MULTIPATH) {
3802 rdev->desc_nr = i++;
3803 rdev->raid_disk = rdev->desc_nr;
3804 set_bit(In_sync, &rdev->flags);
3805 } else if (rdev->raid_disk >=
3806 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3807 !test_bit(Journal, &rdev->flags)) {
3808 rdev->raid_disk = -1;
3809 clear_bit(In_sync, &rdev->flags);
3816 /* Read a fixed-point number.
3817 * Numbers in sysfs attributes should be in "standard" units where
3818 * possible, so time should be in seconds.
3819 * However we internally use a a much smaller unit such as
3820 * milliseconds or jiffies.
3821 * This function takes a decimal number with a possible fractional
3822 * component, and produces an integer which is the result of
3823 * multiplying that number by 10^'scale'.
3824 * all without any floating-point arithmetic.
3826 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3828 unsigned long result = 0;
3830 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3833 else if (decimals < scale) {
3836 result = result * 10 + value;
3848 *res = result * int_pow(10, scale - decimals);
3853 safe_delay_show(struct mddev *mddev, char *page)
3855 int msec = (mddev->safemode_delay*1000)/HZ;
3856 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3859 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3863 if (mddev_is_clustered(mddev)) {
3864 pr_warn("md: Safemode is disabled for clustered mode\n");
3868 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3871 mddev->safemode_delay = 0;
3873 unsigned long old_delay = mddev->safemode_delay;
3874 unsigned long new_delay = (msec*HZ)/1000;
3878 mddev->safemode_delay = new_delay;
3879 if (new_delay < old_delay || old_delay == 0)
3880 mod_timer(&mddev->safemode_timer, jiffies+1);
3884 static struct md_sysfs_entry md_safe_delay =
3885 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3888 level_show(struct mddev *mddev, char *page)
3890 struct md_personality *p;
3892 spin_lock(&mddev->lock);
3895 ret = sprintf(page, "%s\n", p->name);
3896 else if (mddev->clevel[0])
3897 ret = sprintf(page, "%s\n", mddev->clevel);
3898 else if (mddev->level != LEVEL_NONE)
3899 ret = sprintf(page, "%d\n", mddev->level);
3902 spin_unlock(&mddev->lock);
3907 level_store(struct mddev *mddev, const char *buf, size_t len)
3912 struct md_personality *pers, *oldpers;
3914 void *priv, *oldpriv;
3915 struct md_rdev *rdev;
3917 if (slen == 0 || slen >= sizeof(clevel))
3920 rv = mddev_lock(mddev);
3924 if (mddev->pers == NULL) {
3925 strncpy(mddev->clevel, buf, slen);
3926 if (mddev->clevel[slen-1] == '\n')
3928 mddev->clevel[slen] = 0;
3929 mddev->level = LEVEL_NONE;
3937 /* request to change the personality. Need to ensure:
3938 * - array is not engaged in resync/recovery/reshape
3939 * - old personality can be suspended
3940 * - new personality will access other array.
3944 if (mddev->sync_thread ||
3945 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3946 mddev->reshape_position != MaxSector ||
3947 mddev->sysfs_active)
3951 if (!mddev->pers->quiesce) {
3952 pr_warn("md: %s: %s does not support online personality change\n",
3953 mdname(mddev), mddev->pers->name);
3957 /* Now find the new personality */
3958 strncpy(clevel, buf, slen);
3959 if (clevel[slen-1] == '\n')
3962 if (kstrtol(clevel, 10, &level))
3965 if (request_module("md-%s", clevel) != 0)
3966 request_module("md-level-%s", clevel);
3967 spin_lock(&pers_lock);
3968 pers = find_pers(level, clevel);
3969 if (!pers || !try_module_get(pers->owner)) {
3970 spin_unlock(&pers_lock);
3971 pr_warn("md: personality %s not loaded\n", clevel);
3975 spin_unlock(&pers_lock);
3977 if (pers == mddev->pers) {
3978 /* Nothing to do! */
3979 module_put(pers->owner);
3983 if (!pers->takeover) {
3984 module_put(pers->owner);
3985 pr_warn("md: %s: %s does not support personality takeover\n",
3986 mdname(mddev), clevel);
3991 rdev_for_each(rdev, mddev)
3992 rdev->new_raid_disk = rdev->raid_disk;
3994 /* ->takeover must set new_* and/or delta_disks
3995 * if it succeeds, and may set them when it fails.
3997 priv = pers->takeover(mddev);
3999 mddev->new_level = mddev->level;
4000 mddev->new_layout = mddev->layout;
4001 mddev->new_chunk_sectors = mddev->chunk_sectors;
4002 mddev->raid_disks -= mddev->delta_disks;
4003 mddev->delta_disks = 0;
4004 mddev->reshape_backwards = 0;
4005 module_put(pers->owner);
4006 pr_warn("md: %s: %s would not accept array\n",
4007 mdname(mddev), clevel);
4012 /* Looks like we have a winner */
4013 mddev_suspend(mddev);
4014 mddev_detach(mddev);
4016 spin_lock(&mddev->lock);
4017 oldpers = mddev->pers;
4018 oldpriv = mddev->private;
4020 mddev->private = priv;
4021 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4022 mddev->level = mddev->new_level;
4023 mddev->layout = mddev->new_layout;
4024 mddev->chunk_sectors = mddev->new_chunk_sectors;
4025 mddev->delta_disks = 0;
4026 mddev->reshape_backwards = 0;
4027 mddev->degraded = 0;
4028 spin_unlock(&mddev->lock);
4030 if (oldpers->sync_request == NULL &&
4032 /* We are converting from a no-redundancy array
4033 * to a redundancy array and metadata is managed
4034 * externally so we need to be sure that writes
4035 * won't block due to a need to transition
4037 * until external management is started.
4040 mddev->safemode_delay = 0;
4041 mddev->safemode = 0;
4044 oldpers->free(mddev, oldpriv);
4046 if (oldpers->sync_request == NULL &&
4047 pers->sync_request != NULL) {
4048 /* need to add the md_redundancy_group */
4049 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4050 pr_warn("md: cannot register extra attributes for %s\n",
4052 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4053 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4054 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4056 if (oldpers->sync_request != NULL &&
4057 pers->sync_request == NULL) {
4058 /* need to remove the md_redundancy_group */
4059 if (mddev->to_remove == NULL)
4060 mddev->to_remove = &md_redundancy_group;
4063 module_put(oldpers->owner);
4065 rdev_for_each(rdev, mddev) {
4066 if (rdev->raid_disk < 0)
4068 if (rdev->new_raid_disk >= mddev->raid_disks)
4069 rdev->new_raid_disk = -1;
4070 if (rdev->new_raid_disk == rdev->raid_disk)
4072 sysfs_unlink_rdev(mddev, rdev);
4074 rdev_for_each(rdev, mddev) {
4075 if (rdev->raid_disk < 0)
4077 if (rdev->new_raid_disk == rdev->raid_disk)
4079 rdev->raid_disk = rdev->new_raid_disk;
4080 if (rdev->raid_disk < 0)
4081 clear_bit(In_sync, &rdev->flags);
4083 if (sysfs_link_rdev(mddev, rdev))
4084 pr_warn("md: cannot register rd%d for %s after level change\n",
4085 rdev->raid_disk, mdname(mddev));
4089 if (pers->sync_request == NULL) {
4090 /* this is now an array without redundancy, so
4091 * it must always be in_sync
4094 del_timer_sync(&mddev->safemode_timer);
4096 blk_set_stacking_limits(&mddev->queue->limits);
4098 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4099 mddev_resume(mddev);
4101 md_update_sb(mddev, 1);
4102 sysfs_notify_dirent_safe(mddev->sysfs_level);
4106 mddev_unlock(mddev);
4110 static struct md_sysfs_entry md_level =
4111 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4114 layout_show(struct mddev *mddev, char *page)
4116 /* just a number, not meaningful for all levels */
4117 if (mddev->reshape_position != MaxSector &&
4118 mddev->layout != mddev->new_layout)
4119 return sprintf(page, "%d (%d)\n",
4120 mddev->new_layout, mddev->layout);
4121 return sprintf(page, "%d\n", mddev->layout);
4125 layout_store(struct mddev *mddev, const char *buf, size_t len)
4130 err = kstrtouint(buf, 10, &n);
4133 err = mddev_lock(mddev);
4138 if (mddev->pers->check_reshape == NULL)
4143 mddev->new_layout = n;
4144 err = mddev->pers->check_reshape(mddev);
4146 mddev->new_layout = mddev->layout;
4149 mddev->new_layout = n;
4150 if (mddev->reshape_position == MaxSector)
4153 mddev_unlock(mddev);
4156 static struct md_sysfs_entry md_layout =
4157 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4160 raid_disks_show(struct mddev *mddev, char *page)
4162 if (mddev->raid_disks == 0)
4164 if (mddev->reshape_position != MaxSector &&
4165 mddev->delta_disks != 0)
4166 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4167 mddev->raid_disks - mddev->delta_disks);
4168 return sprintf(page, "%d\n", mddev->raid_disks);
4171 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4174 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4179 err = kstrtouint(buf, 10, &n);
4183 err = mddev_lock(mddev);
4187 err = update_raid_disks(mddev, n);
4188 else if (mddev->reshape_position != MaxSector) {
4189 struct md_rdev *rdev;
4190 int olddisks = mddev->raid_disks - mddev->delta_disks;
4193 rdev_for_each(rdev, mddev) {
4195 rdev->data_offset < rdev->new_data_offset)
4198 rdev->data_offset > rdev->new_data_offset)
4202 mddev->delta_disks = n - olddisks;
4203 mddev->raid_disks = n;
4204 mddev->reshape_backwards = (mddev->delta_disks < 0);
4206 mddev->raid_disks = n;
4208 mddev_unlock(mddev);
4209 return err ? err : len;
4211 static struct md_sysfs_entry md_raid_disks =
4212 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4215 uuid_show(struct mddev *mddev, char *page)
4217 return sprintf(page, "%pU\n", mddev->uuid);
4219 static struct md_sysfs_entry md_uuid =
4220 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4223 chunk_size_show(struct mddev *mddev, char *page)
4225 if (mddev->reshape_position != MaxSector &&
4226 mddev->chunk_sectors != mddev->new_chunk_sectors)
4227 return sprintf(page, "%d (%d)\n",
4228 mddev->new_chunk_sectors << 9,
4229 mddev->chunk_sectors << 9);
4230 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4234 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4239 err = kstrtoul(buf, 10, &n);
4243 err = mddev_lock(mddev);
4247 if (mddev->pers->check_reshape == NULL)
4252 mddev->new_chunk_sectors = n >> 9;
4253 err = mddev->pers->check_reshape(mddev);
4255 mddev->new_chunk_sectors = mddev->chunk_sectors;
4258 mddev->new_chunk_sectors = n >> 9;
4259 if (mddev->reshape_position == MaxSector)
4260 mddev->chunk_sectors = n >> 9;
4262 mddev_unlock(mddev);
4265 static struct md_sysfs_entry md_chunk_size =
4266 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4269 resync_start_show(struct mddev *mddev, char *page)
4271 if (mddev->recovery_cp == MaxSector)
4272 return sprintf(page, "none\n");
4273 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4277 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4279 unsigned long long n;
4282 if (cmd_match(buf, "none"))
4285 err = kstrtoull(buf, 10, &n);
4288 if (n != (sector_t)n)
4292 err = mddev_lock(mddev);
4295 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4299 mddev->recovery_cp = n;
4301 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4303 mddev_unlock(mddev);
4306 static struct md_sysfs_entry md_resync_start =
4307 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4308 resync_start_show, resync_start_store);
4311 * The array state can be:
4314 * No devices, no size, no level
4315 * Equivalent to STOP_ARRAY ioctl
4317 * May have some settings, but array is not active
4318 * all IO results in error
4319 * When written, doesn't tear down array, but just stops it
4320 * suspended (not supported yet)
4321 * All IO requests will block. The array can be reconfigured.
4322 * Writing this, if accepted, will block until array is quiescent
4324 * no resync can happen. no superblocks get written.
4325 * write requests fail
4327 * like readonly, but behaves like 'clean' on a write request.
4329 * clean - no pending writes, but otherwise active.
4330 * When written to inactive array, starts without resync
4331 * If a write request arrives then
4332 * if metadata is known, mark 'dirty' and switch to 'active'.
4333 * if not known, block and switch to write-pending
4334 * If written to an active array that has pending writes, then fails.
4336 * fully active: IO and resync can be happening.
4337 * When written to inactive array, starts with resync
4340 * clean, but writes are blocked waiting for 'active' to be written.
4343 * like active, but no writes have been seen for a while (100msec).
4346 * Array is failed. It's useful because mounted-arrays aren't stopped
4347 * when array is failed, so this state will at least alert the user that
4348 * something is wrong.
4350 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4351 write_pending, active_idle, broken, bad_word};
4352 static char *array_states[] = {
4353 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4354 "write-pending", "active-idle", "broken", NULL };
4356 static int match_word(const char *word, char **list)
4359 for (n=0; list[n]; n++)
4360 if (cmd_match(word, list[n]))
4366 array_state_show(struct mddev *mddev, char *page)
4368 enum array_state st = inactive;
4370 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4379 spin_lock(&mddev->lock);
4380 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4382 else if (mddev->in_sync)
4384 else if (mddev->safemode)
4388 spin_unlock(&mddev->lock);
4391 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4394 if (list_empty(&mddev->disks) &&
4395 mddev->raid_disks == 0 &&
4396 mddev->dev_sectors == 0)
4401 return sprintf(page, "%s\n", array_states[st]);
4404 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4405 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4406 static int restart_array(struct mddev *mddev);
4409 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4412 enum array_state st = match_word(buf, array_states);
4414 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4415 /* don't take reconfig_mutex when toggling between
4418 spin_lock(&mddev->lock);
4420 restart_array(mddev);
4421 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4422 md_wakeup_thread(mddev->thread);
4423 wake_up(&mddev->sb_wait);
4424 } else /* st == clean */ {
4425 restart_array(mddev);
4426 if (!set_in_sync(mddev))
4430 sysfs_notify_dirent_safe(mddev->sysfs_state);
4431 spin_unlock(&mddev->lock);
4434 err = mddev_lock(mddev);
4442 /* stopping an active array */
4443 err = do_md_stop(mddev, 0, NULL);
4446 /* stopping an active array */
4448 err = do_md_stop(mddev, 2, NULL);
4450 err = 0; /* already inactive */
4453 break; /* not supported yet */
4456 err = md_set_readonly(mddev, NULL);
4459 set_disk_ro(mddev->gendisk, 1);
4460 err = do_md_run(mddev);
4466 err = md_set_readonly(mddev, NULL);
4467 else if (mddev->ro == 1)
4468 err = restart_array(mddev);
4471 set_disk_ro(mddev->gendisk, 0);
4475 err = do_md_run(mddev);
4480 err = restart_array(mddev);
4483 spin_lock(&mddev->lock);
4484 if (!set_in_sync(mddev))
4486 spin_unlock(&mddev->lock);
4492 err = restart_array(mddev);
4495 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4496 wake_up(&mddev->sb_wait);
4500 set_disk_ro(mddev->gendisk, 0);
4501 err = do_md_run(mddev);
4507 /* these cannot be set */
4512 if (mddev->hold_active == UNTIL_IOCTL)
4513 mddev->hold_active = 0;
4514 sysfs_notify_dirent_safe(mddev->sysfs_state);
4516 mddev_unlock(mddev);
4519 static struct md_sysfs_entry md_array_state =
4520 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4523 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4524 return sprintf(page, "%d\n",
4525 atomic_read(&mddev->max_corr_read_errors));
4529 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4534 rv = kstrtouint(buf, 10, &n);
4537 atomic_set(&mddev->max_corr_read_errors, n);
4541 static struct md_sysfs_entry max_corr_read_errors =
4542 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4543 max_corrected_read_errors_store);
4546 null_show(struct mddev *mddev, char *page)
4551 /* need to ensure rdev_delayed_delete() has completed */
4552 static void flush_rdev_wq(struct mddev *mddev)
4554 struct md_rdev *rdev;
4557 rdev_for_each_rcu(rdev, mddev)
4558 if (work_pending(&rdev->del_work)) {
4559 flush_workqueue(md_rdev_misc_wq);
4566 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4568 /* buf must be %d:%d\n? giving major and minor numbers */
4569 /* The new device is added to the array.
4570 * If the array has a persistent superblock, we read the
4571 * superblock to initialise info and check validity.
4572 * Otherwise, only checking done is that in bind_rdev_to_array,
4573 * which mainly checks size.
4576 int major = simple_strtoul(buf, &e, 10);
4579 struct md_rdev *rdev;
4582 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4584 minor = simple_strtoul(e+1, &e, 10);
4585 if (*e && *e != '\n')
4587 dev = MKDEV(major, minor);
4588 if (major != MAJOR(dev) ||
4589 minor != MINOR(dev))
4592 flush_rdev_wq(mddev);
4593 err = mddev_lock(mddev);
4596 if (mddev->persistent) {
4597 rdev = md_import_device(dev, mddev->major_version,
4598 mddev->minor_version);
4599 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4600 struct md_rdev *rdev0
4601 = list_entry(mddev->disks.next,
4602 struct md_rdev, same_set);
4603 err = super_types[mddev->major_version]
4604 .load_super(rdev, rdev0, mddev->minor_version);
4608 } else if (mddev->external)
4609 rdev = md_import_device(dev, -2, -1);
4611 rdev = md_import_device(dev, -1, -1);
4614 mddev_unlock(mddev);
4615 return PTR_ERR(rdev);
4617 err = bind_rdev_to_array(rdev, mddev);
4621 mddev_unlock(mddev);
4624 return err ? err : len;
4627 static struct md_sysfs_entry md_new_device =
4628 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4631 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4634 unsigned long chunk, end_chunk;
4637 err = mddev_lock(mddev);
4642 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4644 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4645 if (buf == end) break;
4646 if (*end == '-') { /* range */
4648 end_chunk = simple_strtoul(buf, &end, 0);
4649 if (buf == end) break;
4651 if (*end && !isspace(*end)) break;
4652 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4653 buf = skip_spaces(end);
4655 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4657 mddev_unlock(mddev);
4661 static struct md_sysfs_entry md_bitmap =
4662 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4665 size_show(struct mddev *mddev, char *page)
4667 return sprintf(page, "%llu\n",
4668 (unsigned long long)mddev->dev_sectors / 2);
4671 static int update_size(struct mddev *mddev, sector_t num_sectors);
4674 size_store(struct mddev *mddev, const char *buf, size_t len)
4676 /* If array is inactive, we can reduce the component size, but
4677 * not increase it (except from 0).
4678 * If array is active, we can try an on-line resize
4681 int err = strict_blocks_to_sectors(buf, §ors);
4685 err = mddev_lock(mddev);
4689 err = update_size(mddev, sectors);
4691 md_update_sb(mddev, 1);
4693 if (mddev->dev_sectors == 0 ||
4694 mddev->dev_sectors > sectors)
4695 mddev->dev_sectors = sectors;
4699 mddev_unlock(mddev);
4700 return err ? err : len;
4703 static struct md_sysfs_entry md_size =
4704 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4706 /* Metadata version.
4708 * 'none' for arrays with no metadata (good luck...)
4709 * 'external' for arrays with externally managed metadata,
4710 * or N.M for internally known formats
4713 metadata_show(struct mddev *mddev, char *page)
4715 if (mddev->persistent)
4716 return sprintf(page, "%d.%d\n",
4717 mddev->major_version, mddev->minor_version);
4718 else if (mddev->external)
4719 return sprintf(page, "external:%s\n", mddev->metadata_type);
4721 return sprintf(page, "none\n");
4725 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4730 /* Changing the details of 'external' metadata is
4731 * always permitted. Otherwise there must be
4732 * no devices attached to the array.
4735 err = mddev_lock(mddev);
4739 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4741 else if (!list_empty(&mddev->disks))
4745 if (cmd_match(buf, "none")) {
4746 mddev->persistent = 0;
4747 mddev->external = 0;
4748 mddev->major_version = 0;
4749 mddev->minor_version = 90;
4752 if (strncmp(buf, "external:", 9) == 0) {
4753 size_t namelen = len-9;
4754 if (namelen >= sizeof(mddev->metadata_type))
4755 namelen = sizeof(mddev->metadata_type)-1;
4756 strncpy(mddev->metadata_type, buf+9, namelen);
4757 mddev->metadata_type[namelen] = 0;
4758 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4759 mddev->metadata_type[--namelen] = 0;
4760 mddev->persistent = 0;
4761 mddev->external = 1;
4762 mddev->major_version = 0;
4763 mddev->minor_version = 90;
4766 major = simple_strtoul(buf, &e, 10);
4768 if (e==buf || *e != '.')
4771 minor = simple_strtoul(buf, &e, 10);
4772 if (e==buf || (*e && *e != '\n') )
4775 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4777 mddev->major_version = major;
4778 mddev->minor_version = minor;
4779 mddev->persistent = 1;
4780 mddev->external = 0;
4783 mddev_unlock(mddev);
4787 static struct md_sysfs_entry md_metadata =
4788 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4791 action_show(struct mddev *mddev, char *page)
4793 char *type = "idle";
4794 unsigned long recovery = mddev->recovery;
4795 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4797 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4798 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4799 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4801 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4802 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4804 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4808 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4810 else if (mddev->reshape_position != MaxSector)
4813 return sprintf(page, "%s\n", type);
4817 action_store(struct mddev *mddev, const char *page, size_t len)
4819 if (!mddev->pers || !mddev->pers->sync_request)
4823 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4824 if (cmd_match(page, "frozen"))
4825 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4827 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4828 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4829 mddev_lock(mddev) == 0) {
4830 if (work_pending(&mddev->del_work))
4831 flush_workqueue(md_misc_wq);
4832 if (mddev->sync_thread) {
4833 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4834 md_reap_sync_thread(mddev);
4836 mddev_unlock(mddev);
4838 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4840 else if (cmd_match(page, "resync"))
4841 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4842 else if (cmd_match(page, "recover")) {
4843 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4844 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4845 } else if (cmd_match(page, "reshape")) {
4847 if (mddev->pers->start_reshape == NULL)
4849 err = mddev_lock(mddev);
4851 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4854 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4855 err = mddev->pers->start_reshape(mddev);
4857 mddev_unlock(mddev);
4861 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4863 if (cmd_match(page, "check"))
4864 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4865 else if (!cmd_match(page, "repair"))
4867 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4868 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4869 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4871 if (mddev->ro == 2) {
4872 /* A write to sync_action is enough to justify
4873 * canceling read-auto mode
4876 md_wakeup_thread(mddev->sync_thread);
4878 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4879 md_wakeup_thread(mddev->thread);
4880 sysfs_notify_dirent_safe(mddev->sysfs_action);
4884 static struct md_sysfs_entry md_scan_mode =
4885 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4888 last_sync_action_show(struct mddev *mddev, char *page)
4890 return sprintf(page, "%s\n", mddev->last_sync_action);
4893 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4896 mismatch_cnt_show(struct mddev *mddev, char *page)
4898 return sprintf(page, "%llu\n",
4899 (unsigned long long)
4900 atomic64_read(&mddev->resync_mismatches));
4903 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4906 sync_min_show(struct mddev *mddev, char *page)
4908 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4909 mddev->sync_speed_min ? "local": "system");
4913 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4918 if (strncmp(buf, "system", 6)==0) {
4921 rv = kstrtouint(buf, 10, &min);
4927 mddev->sync_speed_min = min;
4931 static struct md_sysfs_entry md_sync_min =
4932 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4935 sync_max_show(struct mddev *mddev, char *page)
4937 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4938 mddev->sync_speed_max ? "local": "system");
4942 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4947 if (strncmp(buf, "system", 6)==0) {
4950 rv = kstrtouint(buf, 10, &max);
4956 mddev->sync_speed_max = max;
4960 static struct md_sysfs_entry md_sync_max =
4961 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4964 degraded_show(struct mddev *mddev, char *page)
4966 return sprintf(page, "%d\n", mddev->degraded);
4968 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4971 sync_force_parallel_show(struct mddev *mddev, char *page)
4973 return sprintf(page, "%d\n", mddev->parallel_resync);
4977 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4981 if (kstrtol(buf, 10, &n))
4984 if (n != 0 && n != 1)
4987 mddev->parallel_resync = n;
4989 if (mddev->sync_thread)
4990 wake_up(&resync_wait);
4995 /* force parallel resync, even with shared block devices */
4996 static struct md_sysfs_entry md_sync_force_parallel =
4997 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4998 sync_force_parallel_show, sync_force_parallel_store);
5001 sync_speed_show(struct mddev *mddev, char *page)
5003 unsigned long resync, dt, db;
5004 if (mddev->curr_resync == 0)
5005 return sprintf(page, "none\n");
5006 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5007 dt = (jiffies - mddev->resync_mark) / HZ;
5009 db = resync - mddev->resync_mark_cnt;
5010 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5013 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5016 sync_completed_show(struct mddev *mddev, char *page)
5018 unsigned long long max_sectors, resync;
5020 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5021 return sprintf(page, "none\n");
5023 if (mddev->curr_resync == 1 ||
5024 mddev->curr_resync == 2)
5025 return sprintf(page, "delayed\n");
5027 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5028 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5029 max_sectors = mddev->resync_max_sectors;
5031 max_sectors = mddev->dev_sectors;
5033 resync = mddev->curr_resync_completed;
5034 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5037 static struct md_sysfs_entry md_sync_completed =
5038 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5041 min_sync_show(struct mddev *mddev, char *page)
5043 return sprintf(page, "%llu\n",
5044 (unsigned long long)mddev->resync_min);
5047 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5049 unsigned long long min;
5052 if (kstrtoull(buf, 10, &min))
5055 spin_lock(&mddev->lock);
5057 if (min > mddev->resync_max)
5061 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5064 /* Round down to multiple of 4K for safety */
5065 mddev->resync_min = round_down(min, 8);
5069 spin_unlock(&mddev->lock);
5073 static struct md_sysfs_entry md_min_sync =
5074 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5077 max_sync_show(struct mddev *mddev, char *page)
5079 if (mddev->resync_max == MaxSector)
5080 return sprintf(page, "max\n");
5082 return sprintf(page, "%llu\n",
5083 (unsigned long long)mddev->resync_max);
5086 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5089 spin_lock(&mddev->lock);
5090 if (strncmp(buf, "max", 3) == 0)
5091 mddev->resync_max = MaxSector;
5093 unsigned long long max;
5097 if (kstrtoull(buf, 10, &max))
5099 if (max < mddev->resync_min)
5103 if (max < mddev->resync_max &&
5105 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5108 /* Must be a multiple of chunk_size */
5109 chunk = mddev->chunk_sectors;
5111 sector_t temp = max;
5114 if (sector_div(temp, chunk))
5117 mddev->resync_max = max;
5119 wake_up(&mddev->recovery_wait);
5122 spin_unlock(&mddev->lock);
5126 static struct md_sysfs_entry md_max_sync =
5127 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5130 suspend_lo_show(struct mddev *mddev, char *page)
5132 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5136 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5138 unsigned long long new;
5141 err = kstrtoull(buf, 10, &new);
5144 if (new != (sector_t)new)
5147 err = mddev_lock(mddev);
5151 if (mddev->pers == NULL ||
5152 mddev->pers->quiesce == NULL)
5154 mddev_suspend(mddev);
5155 mddev->suspend_lo = new;
5156 mddev_resume(mddev);
5160 mddev_unlock(mddev);
5163 static struct md_sysfs_entry md_suspend_lo =
5164 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5167 suspend_hi_show(struct mddev *mddev, char *page)
5169 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5173 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5175 unsigned long long new;
5178 err = kstrtoull(buf, 10, &new);
5181 if (new != (sector_t)new)
5184 err = mddev_lock(mddev);
5188 if (mddev->pers == NULL)
5191 mddev_suspend(mddev);
5192 mddev->suspend_hi = new;
5193 mddev_resume(mddev);
5197 mddev_unlock(mddev);
5200 static struct md_sysfs_entry md_suspend_hi =
5201 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5204 reshape_position_show(struct mddev *mddev, char *page)
5206 if (mddev->reshape_position != MaxSector)
5207 return sprintf(page, "%llu\n",
5208 (unsigned long long)mddev->reshape_position);
5209 strcpy(page, "none\n");
5214 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5216 struct md_rdev *rdev;
5217 unsigned long long new;
5220 err = kstrtoull(buf, 10, &new);
5223 if (new != (sector_t)new)
5225 err = mddev_lock(mddev);
5231 mddev->reshape_position = new;
5232 mddev->delta_disks = 0;
5233 mddev->reshape_backwards = 0;
5234 mddev->new_level = mddev->level;
5235 mddev->new_layout = mddev->layout;
5236 mddev->new_chunk_sectors = mddev->chunk_sectors;
5237 rdev_for_each(rdev, mddev)
5238 rdev->new_data_offset = rdev->data_offset;
5241 mddev_unlock(mddev);
5245 static struct md_sysfs_entry md_reshape_position =
5246 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5247 reshape_position_store);
5250 reshape_direction_show(struct mddev *mddev, char *page)
5252 return sprintf(page, "%s\n",
5253 mddev->reshape_backwards ? "backwards" : "forwards");
5257 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5262 if (cmd_match(buf, "forwards"))
5264 else if (cmd_match(buf, "backwards"))
5268 if (mddev->reshape_backwards == backwards)
5271 err = mddev_lock(mddev);
5274 /* check if we are allowed to change */
5275 if (mddev->delta_disks)
5277 else if (mddev->persistent &&
5278 mddev->major_version == 0)
5281 mddev->reshape_backwards = backwards;
5282 mddev_unlock(mddev);
5286 static struct md_sysfs_entry md_reshape_direction =
5287 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5288 reshape_direction_store);
5291 array_size_show(struct mddev *mddev, char *page)
5293 if (mddev->external_size)
5294 return sprintf(page, "%llu\n",
5295 (unsigned long long)mddev->array_sectors/2);
5297 return sprintf(page, "default\n");
5301 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5306 err = mddev_lock(mddev);
5310 /* cluster raid doesn't support change array_sectors */
5311 if (mddev_is_clustered(mddev)) {
5312 mddev_unlock(mddev);
5316 if (strncmp(buf, "default", 7) == 0) {
5318 sectors = mddev->pers->size(mddev, 0, 0);
5320 sectors = mddev->array_sectors;
5322 mddev->external_size = 0;
5324 if (strict_blocks_to_sectors(buf, §ors) < 0)
5326 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5329 mddev->external_size = 1;
5333 mddev->array_sectors = sectors;
5335 set_capacity_and_notify(mddev->gendisk,
5336 mddev->array_sectors);
5338 mddev_unlock(mddev);
5342 static struct md_sysfs_entry md_array_size =
5343 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5347 consistency_policy_show(struct mddev *mddev, char *page)
5351 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5352 ret = sprintf(page, "journal\n");
5353 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5354 ret = sprintf(page, "ppl\n");
5355 } else if (mddev->bitmap) {
5356 ret = sprintf(page, "bitmap\n");
5357 } else if (mddev->pers) {
5358 if (mddev->pers->sync_request)
5359 ret = sprintf(page, "resync\n");
5361 ret = sprintf(page, "none\n");
5363 ret = sprintf(page, "unknown\n");
5370 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5375 if (mddev->pers->change_consistency_policy)
5376 err = mddev->pers->change_consistency_policy(mddev, buf);
5379 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5380 set_bit(MD_HAS_PPL, &mddev->flags);
5385 return err ? err : len;
5388 static struct md_sysfs_entry md_consistency_policy =
5389 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5390 consistency_policy_store);
5392 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5394 return sprintf(page, "%d\n", mddev->fail_last_dev);
5398 * Setting fail_last_dev to true to allow last device to be forcibly removed
5399 * from RAID1/RAID10.
5402 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5407 ret = kstrtobool(buf, &value);
5411 if (value != mddev->fail_last_dev)
5412 mddev->fail_last_dev = value;
5416 static struct md_sysfs_entry md_fail_last_dev =
5417 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5418 fail_last_dev_store);
5420 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5422 if (mddev->pers == NULL || (mddev->pers->level != 1))
5423 return sprintf(page, "n/a\n");
5425 return sprintf(page, "%d\n", mddev->serialize_policy);
5429 * Setting serialize_policy to true to enforce write IO is not reordered
5433 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5438 err = kstrtobool(buf, &value);
5442 if (value == mddev->serialize_policy)
5445 err = mddev_lock(mddev);
5448 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5449 pr_err("md: serialize_policy is only effective for raid1\n");
5454 mddev_suspend(mddev);
5456 mddev_create_serial_pool(mddev, NULL, true);
5458 mddev_destroy_serial_pool(mddev, NULL, true);
5459 mddev->serialize_policy = value;
5460 mddev_resume(mddev);
5462 mddev_unlock(mddev);
5466 static struct md_sysfs_entry md_serialize_policy =
5467 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5468 serialize_policy_store);
5471 static struct attribute *md_default_attrs[] = {
5474 &md_raid_disks.attr,
5476 &md_chunk_size.attr,
5478 &md_resync_start.attr,
5480 &md_new_device.attr,
5481 &md_safe_delay.attr,
5482 &md_array_state.attr,
5483 &md_reshape_position.attr,
5484 &md_reshape_direction.attr,
5485 &md_array_size.attr,
5486 &max_corr_read_errors.attr,
5487 &md_consistency_policy.attr,
5488 &md_fail_last_dev.attr,
5489 &md_serialize_policy.attr,
5493 static const struct attribute_group md_default_group = {
5494 .attrs = md_default_attrs,
5497 static struct attribute *md_redundancy_attrs[] = {
5499 &md_last_scan_mode.attr,
5500 &md_mismatches.attr,
5503 &md_sync_speed.attr,
5504 &md_sync_force_parallel.attr,
5505 &md_sync_completed.attr,
5508 &md_suspend_lo.attr,
5509 &md_suspend_hi.attr,
5514 static const struct attribute_group md_redundancy_group = {
5516 .attrs = md_redundancy_attrs,
5519 static const struct attribute_group *md_attr_groups[] = {
5526 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5528 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5529 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5534 spin_lock(&all_mddevs_lock);
5535 if (list_empty(&mddev->all_mddevs)) {
5536 spin_unlock(&all_mddevs_lock);
5540 spin_unlock(&all_mddevs_lock);
5542 rv = entry->show(mddev, page);
5548 md_attr_store(struct kobject *kobj, struct attribute *attr,
5549 const char *page, size_t length)
5551 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5552 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5557 if (!capable(CAP_SYS_ADMIN))
5559 spin_lock(&all_mddevs_lock);
5560 if (list_empty(&mddev->all_mddevs)) {
5561 spin_unlock(&all_mddevs_lock);
5565 spin_unlock(&all_mddevs_lock);
5566 rv = entry->store(mddev, page, length);
5571 static void md_free(struct kobject *ko)
5573 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5575 if (mddev->sysfs_state)
5576 sysfs_put(mddev->sysfs_state);
5577 if (mddev->sysfs_level)
5578 sysfs_put(mddev->sysfs_level);
5580 if (mddev->gendisk) {
5581 del_gendisk(mddev->gendisk);
5582 blk_cleanup_disk(mddev->gendisk);
5584 percpu_ref_exit(&mddev->writes_pending);
5586 bioset_exit(&mddev->bio_set);
5587 bioset_exit(&mddev->sync_set);
5591 static const struct sysfs_ops md_sysfs_ops = {
5592 .show = md_attr_show,
5593 .store = md_attr_store,
5595 static struct kobj_type md_ktype = {
5597 .sysfs_ops = &md_sysfs_ops,
5598 .default_groups = md_attr_groups,
5603 static void mddev_delayed_delete(struct work_struct *ws)
5605 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5607 kobject_del(&mddev->kobj);
5608 kobject_put(&mddev->kobj);
5611 static void no_op(struct percpu_ref *r) {}
5613 int mddev_init_writes_pending(struct mddev *mddev)
5615 if (mddev->writes_pending.percpu_count_ptr)
5617 if (percpu_ref_init(&mddev->writes_pending, no_op,
5618 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5620 /* We want to start with the refcount at zero */
5621 percpu_ref_put(&mddev->writes_pending);
5624 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5626 static int md_alloc(dev_t dev, char *name)
5629 * If dev is zero, name is the name of a device to allocate with
5630 * an arbitrary minor number. It will be "md_???"
5631 * If dev is non-zero it must be a device number with a MAJOR of
5632 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5633 * the device is being created by opening a node in /dev.
5634 * If "name" is not NULL, the device is being created by
5635 * writing to /sys/module/md_mod/parameters/new_array.
5637 static DEFINE_MUTEX(disks_mutex);
5638 struct mddev *mddev;
5639 struct gendisk *disk;
5646 * Wait for any previous instance of this device to be completely
5647 * removed (mddev_delayed_delete).
5649 flush_workqueue(md_misc_wq);
5650 flush_workqueue(md_rdev_misc_wq);
5652 mutex_lock(&disks_mutex);
5653 mddev = mddev_alloc(dev);
5654 if (IS_ERR(mddev)) {
5655 mutex_unlock(&disks_mutex);
5656 return PTR_ERR(mddev);
5659 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5660 shift = partitioned ? MdpMinorShift : 0;
5661 unit = MINOR(mddev->unit) >> shift;
5664 /* Need to ensure that 'name' is not a duplicate.
5666 struct mddev *mddev2;
5667 spin_lock(&all_mddevs_lock);
5669 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5670 if (mddev2->gendisk &&
5671 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5672 spin_unlock(&all_mddevs_lock);
5674 goto out_unlock_disks_mutex;
5676 spin_unlock(&all_mddevs_lock);
5680 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5682 mddev->hold_active = UNTIL_STOP;
5685 disk = blk_alloc_disk(NUMA_NO_NODE);
5687 goto out_unlock_disks_mutex;
5689 disk->major = MAJOR(mddev->unit);
5690 disk->first_minor = unit << shift;
5691 disk->minors = 1 << shift;
5693 strcpy(disk->disk_name, name);
5694 else if (partitioned)
5695 sprintf(disk->disk_name, "md_d%d", unit);
5697 sprintf(disk->disk_name, "md%d", unit);
5698 disk->fops = &md_fops;
5699 disk->private_data = mddev;
5701 mddev->queue = disk->queue;
5702 blk_set_stacking_limits(&mddev->queue->limits);
5703 blk_queue_write_cache(mddev->queue, true, true);
5704 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5705 mddev->gendisk = disk;
5706 error = add_disk(disk);
5708 goto out_cleanup_disk;
5710 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5712 goto out_del_gendisk;
5714 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5715 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5716 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5717 goto out_unlock_disks_mutex;
5722 blk_cleanup_disk(disk);
5723 out_unlock_disks_mutex:
5724 mutex_unlock(&disks_mutex);
5729 static void md_probe(dev_t dev)
5731 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5734 md_alloc(dev, NULL);
5737 static int add_named_array(const char *val, const struct kernel_param *kp)
5740 * val must be "md_*" or "mdNNN".
5741 * For "md_*" we allocate an array with a large free minor number, and
5742 * set the name to val. val must not already be an active name.
5743 * For "mdNNN" we allocate an array with the minor number NNN
5744 * which must not already be in use.
5746 int len = strlen(val);
5747 char buf[DISK_NAME_LEN];
5748 unsigned long devnum;
5750 while (len && val[len-1] == '\n')
5752 if (len >= DISK_NAME_LEN)
5754 strscpy(buf, val, len+1);
5755 if (strncmp(buf, "md_", 3) == 0)
5756 return md_alloc(0, buf);
5757 if (strncmp(buf, "md", 2) == 0 &&
5759 kstrtoul(buf+2, 10, &devnum) == 0 &&
5760 devnum <= MINORMASK)
5761 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5766 static void md_safemode_timeout(struct timer_list *t)
5768 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5770 mddev->safemode = 1;
5771 if (mddev->external)
5772 sysfs_notify_dirent_safe(mddev->sysfs_state);
5774 md_wakeup_thread(mddev->thread);
5777 static int start_dirty_degraded;
5779 int md_run(struct mddev *mddev)
5782 struct md_rdev *rdev;
5783 struct md_personality *pers;
5786 if (list_empty(&mddev->disks))
5787 /* cannot run an array with no devices.. */
5792 /* Cannot run until previous stop completes properly */
5793 if (mddev->sysfs_active)
5797 * Analyze all RAID superblock(s)
5799 if (!mddev->raid_disks) {
5800 if (!mddev->persistent)
5802 err = analyze_sbs(mddev);
5807 if (mddev->level != LEVEL_NONE)
5808 request_module("md-level-%d", mddev->level);
5809 else if (mddev->clevel[0])
5810 request_module("md-%s", mddev->clevel);
5813 * Drop all container device buffers, from now on
5814 * the only valid external interface is through the md
5817 mddev->has_superblocks = false;
5818 rdev_for_each(rdev, mddev) {
5819 if (test_bit(Faulty, &rdev->flags))
5821 sync_blockdev(rdev->bdev);
5822 invalidate_bdev(rdev->bdev);
5823 if (mddev->ro != 1 && rdev_read_only(rdev)) {
5826 set_disk_ro(mddev->gendisk, 1);
5830 mddev->has_superblocks = true;
5832 /* perform some consistency tests on the device.
5833 * We don't want the data to overlap the metadata,
5834 * Internal Bitmap issues have been handled elsewhere.
5836 if (rdev->meta_bdev) {
5837 /* Nothing to check */;
5838 } else if (rdev->data_offset < rdev->sb_start) {
5839 if (mddev->dev_sectors &&
5840 rdev->data_offset + mddev->dev_sectors
5842 pr_warn("md: %s: data overlaps metadata\n",
5847 if (rdev->sb_start + rdev->sb_size/512
5848 > rdev->data_offset) {
5849 pr_warn("md: %s: metadata overlaps data\n",
5854 sysfs_notify_dirent_safe(rdev->sysfs_state);
5855 nowait = nowait && blk_queue_nowait(bdev_get_queue(rdev->bdev));
5858 if (!bioset_initialized(&mddev->bio_set)) {
5859 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5863 if (!bioset_initialized(&mddev->sync_set)) {
5864 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5869 spin_lock(&pers_lock);
5870 pers = find_pers(mddev->level, mddev->clevel);
5871 if (!pers || !try_module_get(pers->owner)) {
5872 spin_unlock(&pers_lock);
5873 if (mddev->level != LEVEL_NONE)
5874 pr_warn("md: personality for level %d is not loaded!\n",
5877 pr_warn("md: personality for level %s is not loaded!\n",
5882 spin_unlock(&pers_lock);
5883 if (mddev->level != pers->level) {
5884 mddev->level = pers->level;
5885 mddev->new_level = pers->level;
5887 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5889 if (mddev->reshape_position != MaxSector &&
5890 pers->start_reshape == NULL) {
5891 /* This personality cannot handle reshaping... */
5892 module_put(pers->owner);
5897 if (pers->sync_request) {
5898 /* Warn if this is a potentially silly
5901 struct md_rdev *rdev2;
5904 rdev_for_each(rdev, mddev)
5905 rdev_for_each(rdev2, mddev) {
5907 rdev->bdev->bd_disk ==
5908 rdev2->bdev->bd_disk) {
5909 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
5918 pr_warn("True protection against single-disk failure might be compromised.\n");
5921 mddev->recovery = 0;
5922 /* may be over-ridden by personality */
5923 mddev->resync_max_sectors = mddev->dev_sectors;
5925 mddev->ok_start_degraded = start_dirty_degraded;
5927 if (start_readonly && mddev->ro == 0)
5928 mddev->ro = 2; /* read-only, but switch on first write */
5930 err = pers->run(mddev);
5932 pr_warn("md: pers->run() failed ...\n");
5933 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5934 WARN_ONCE(!mddev->external_size,
5935 "%s: default size too small, but 'external_size' not in effect?\n",
5937 pr_warn("md: invalid array_size %llu > default size %llu\n",
5938 (unsigned long long)mddev->array_sectors / 2,
5939 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5942 if (err == 0 && pers->sync_request &&
5943 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5944 struct bitmap *bitmap;
5946 bitmap = md_bitmap_create(mddev, -1);
5947 if (IS_ERR(bitmap)) {
5948 err = PTR_ERR(bitmap);
5949 pr_warn("%s: failed to create bitmap (%d)\n",
5950 mdname(mddev), err);
5952 mddev->bitmap = bitmap;
5958 if (mddev->bitmap_info.max_write_behind > 0) {
5959 bool create_pool = false;
5961 rdev_for_each(rdev, mddev) {
5962 if (test_bit(WriteMostly, &rdev->flags) &&
5963 rdev_init_serial(rdev))
5966 if (create_pool && mddev->serial_info_pool == NULL) {
5967 mddev->serial_info_pool =
5968 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5969 sizeof(struct serial_info));
5970 if (!mddev->serial_info_pool) {
5980 rdev_for_each(rdev, mddev) {
5981 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
5986 if (mddev->degraded)
5989 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5991 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5992 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
5994 /* Set the NOWAIT flags if all underlying devices support it */
5996 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
5998 if (pers->sync_request) {
5999 if (mddev->kobj.sd &&
6000 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6001 pr_warn("md: cannot register extra attributes for %s\n",
6003 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6004 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6005 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6006 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6009 atomic_set(&mddev->max_corr_read_errors,
6010 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6011 mddev->safemode = 0;
6012 if (mddev_is_clustered(mddev))
6013 mddev->safemode_delay = 0;
6015 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6018 spin_lock(&mddev->lock);
6020 spin_unlock(&mddev->lock);
6021 rdev_for_each(rdev, mddev)
6022 if (rdev->raid_disk >= 0)
6023 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6025 if (mddev->degraded && !mddev->ro)
6026 /* This ensures that recovering status is reported immediately
6027 * via sysfs - until a lack of spares is confirmed.
6029 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6030 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6032 if (mddev->sb_flags)
6033 md_update_sb(mddev, 0);
6039 mddev_detach(mddev);
6041 pers->free(mddev, mddev->private);
6042 mddev->private = NULL;
6043 module_put(pers->owner);
6044 md_bitmap_destroy(mddev);
6046 bioset_exit(&mddev->sync_set);
6048 bioset_exit(&mddev->bio_set);
6051 EXPORT_SYMBOL_GPL(md_run);
6053 int do_md_run(struct mddev *mddev)
6057 set_bit(MD_NOT_READY, &mddev->flags);
6058 err = md_run(mddev);
6061 err = md_bitmap_load(mddev);
6063 md_bitmap_destroy(mddev);
6067 if (mddev_is_clustered(mddev))
6068 md_allow_write(mddev);
6070 /* run start up tasks that require md_thread */
6073 md_wakeup_thread(mddev->thread);
6074 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6076 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6077 clear_bit(MD_NOT_READY, &mddev->flags);
6079 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6080 sysfs_notify_dirent_safe(mddev->sysfs_state);
6081 sysfs_notify_dirent_safe(mddev->sysfs_action);
6082 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6084 clear_bit(MD_NOT_READY, &mddev->flags);
6088 int md_start(struct mddev *mddev)
6092 if (mddev->pers->start) {
6093 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6094 md_wakeup_thread(mddev->thread);
6095 ret = mddev->pers->start(mddev);
6096 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6097 md_wakeup_thread(mddev->sync_thread);
6101 EXPORT_SYMBOL_GPL(md_start);
6103 static int restart_array(struct mddev *mddev)
6105 struct gendisk *disk = mddev->gendisk;
6106 struct md_rdev *rdev;
6107 bool has_journal = false;
6108 bool has_readonly = false;
6110 /* Complain if it has no devices */
6111 if (list_empty(&mddev->disks))
6119 rdev_for_each_rcu(rdev, mddev) {
6120 if (test_bit(Journal, &rdev->flags) &&
6121 !test_bit(Faulty, &rdev->flags))
6123 if (rdev_read_only(rdev))
6124 has_readonly = true;
6127 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6128 /* Don't restart rw with journal missing/faulty */
6133 mddev->safemode = 0;
6135 set_disk_ro(disk, 0);
6136 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6137 /* Kick recovery or resync if necessary */
6138 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6139 md_wakeup_thread(mddev->thread);
6140 md_wakeup_thread(mddev->sync_thread);
6141 sysfs_notify_dirent_safe(mddev->sysfs_state);
6145 static void md_clean(struct mddev *mddev)
6147 mddev->array_sectors = 0;
6148 mddev->external_size = 0;
6149 mddev->dev_sectors = 0;
6150 mddev->raid_disks = 0;
6151 mddev->recovery_cp = 0;
6152 mddev->resync_min = 0;
6153 mddev->resync_max = MaxSector;
6154 mddev->reshape_position = MaxSector;
6155 mddev->external = 0;
6156 mddev->persistent = 0;
6157 mddev->level = LEVEL_NONE;
6158 mddev->clevel[0] = 0;
6160 mddev->sb_flags = 0;
6162 mddev->metadata_type[0] = 0;
6163 mddev->chunk_sectors = 0;
6164 mddev->ctime = mddev->utime = 0;
6166 mddev->max_disks = 0;
6168 mddev->can_decrease_events = 0;
6169 mddev->delta_disks = 0;
6170 mddev->reshape_backwards = 0;
6171 mddev->new_level = LEVEL_NONE;
6172 mddev->new_layout = 0;
6173 mddev->new_chunk_sectors = 0;
6174 mddev->curr_resync = 0;
6175 atomic64_set(&mddev->resync_mismatches, 0);
6176 mddev->suspend_lo = mddev->suspend_hi = 0;
6177 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6178 mddev->recovery = 0;
6181 mddev->degraded = 0;
6182 mddev->safemode = 0;
6183 mddev->private = NULL;
6184 mddev->cluster_info = NULL;
6185 mddev->bitmap_info.offset = 0;
6186 mddev->bitmap_info.default_offset = 0;
6187 mddev->bitmap_info.default_space = 0;
6188 mddev->bitmap_info.chunksize = 0;
6189 mddev->bitmap_info.daemon_sleep = 0;
6190 mddev->bitmap_info.max_write_behind = 0;
6191 mddev->bitmap_info.nodes = 0;
6194 static void __md_stop_writes(struct mddev *mddev)
6196 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6197 if (work_pending(&mddev->del_work))
6198 flush_workqueue(md_misc_wq);
6199 if (mddev->sync_thread) {
6200 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6201 md_reap_sync_thread(mddev);
6204 del_timer_sync(&mddev->safemode_timer);
6206 if (mddev->pers && mddev->pers->quiesce) {
6207 mddev->pers->quiesce(mddev, 1);
6208 mddev->pers->quiesce(mddev, 0);
6210 md_bitmap_flush(mddev);
6212 if (mddev->ro == 0 &&
6213 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6215 /* mark array as shutdown cleanly */
6216 if (!mddev_is_clustered(mddev))
6218 md_update_sb(mddev, 1);
6220 /* disable policy to guarantee rdevs free resources for serialization */
6221 mddev->serialize_policy = 0;
6222 mddev_destroy_serial_pool(mddev, NULL, true);
6225 void md_stop_writes(struct mddev *mddev)
6227 mddev_lock_nointr(mddev);
6228 __md_stop_writes(mddev);
6229 mddev_unlock(mddev);
6231 EXPORT_SYMBOL_GPL(md_stop_writes);
6233 static void mddev_detach(struct mddev *mddev)
6235 md_bitmap_wait_behind_writes(mddev);
6236 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6237 mddev->pers->quiesce(mddev, 1);
6238 mddev->pers->quiesce(mddev, 0);
6240 md_unregister_thread(&mddev->thread);
6242 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6245 static void __md_stop(struct mddev *mddev)
6247 struct md_personality *pers = mddev->pers;
6248 md_bitmap_destroy(mddev);
6249 mddev_detach(mddev);
6250 /* Ensure ->event_work is done */
6251 if (mddev->event_work.func)
6252 flush_workqueue(md_misc_wq);
6253 spin_lock(&mddev->lock);
6255 spin_unlock(&mddev->lock);
6257 pers->free(mddev, mddev->private);
6258 mddev->private = NULL;
6259 if (pers->sync_request && mddev->to_remove == NULL)
6260 mddev->to_remove = &md_redundancy_group;
6261 module_put(pers->owner);
6262 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6265 void md_stop(struct mddev *mddev)
6267 /* stop the array and free an attached data structures.
6268 * This is called from dm-raid
6270 __md_stop_writes(mddev);
6272 bioset_exit(&mddev->bio_set);
6273 bioset_exit(&mddev->sync_set);
6276 EXPORT_SYMBOL_GPL(md_stop);
6278 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6283 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6285 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6286 md_wakeup_thread(mddev->thread);
6288 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6289 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6290 if (mddev->sync_thread)
6291 /* Thread might be blocked waiting for metadata update
6292 * which will now never happen */
6293 wake_up_process(mddev->sync_thread->tsk);
6295 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6297 mddev_unlock(mddev);
6298 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6300 wait_event(mddev->sb_wait,
6301 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6302 mddev_lock_nointr(mddev);
6304 mutex_lock(&mddev->open_mutex);
6305 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6306 mddev->sync_thread ||
6307 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6308 pr_warn("md: %s still in use.\n",mdname(mddev));
6310 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6311 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6312 md_wakeup_thread(mddev->thread);
6318 __md_stop_writes(mddev);
6324 set_disk_ro(mddev->gendisk, 1);
6325 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6326 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6327 md_wakeup_thread(mddev->thread);
6328 sysfs_notify_dirent_safe(mddev->sysfs_state);
6332 mutex_unlock(&mddev->open_mutex);
6337 * 0 - completely stop and dis-assemble array
6338 * 2 - stop but do not disassemble array
6340 static int do_md_stop(struct mddev *mddev, int mode,
6341 struct block_device *bdev)
6343 struct gendisk *disk = mddev->gendisk;
6344 struct md_rdev *rdev;
6347 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6349 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6350 md_wakeup_thread(mddev->thread);
6352 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6353 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6354 if (mddev->sync_thread)
6355 /* Thread might be blocked waiting for metadata update
6356 * which will now never happen */
6357 wake_up_process(mddev->sync_thread->tsk);
6359 mddev_unlock(mddev);
6360 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6361 !test_bit(MD_RECOVERY_RUNNING,
6362 &mddev->recovery)));
6363 mddev_lock_nointr(mddev);
6365 mutex_lock(&mddev->open_mutex);
6366 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6367 mddev->sysfs_active ||
6368 mddev->sync_thread ||
6369 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6370 pr_warn("md: %s still in use.\n",mdname(mddev));
6371 mutex_unlock(&mddev->open_mutex);
6373 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6374 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6375 md_wakeup_thread(mddev->thread);
6381 set_disk_ro(disk, 0);
6383 __md_stop_writes(mddev);
6386 /* tell userspace to handle 'inactive' */
6387 sysfs_notify_dirent_safe(mddev->sysfs_state);
6389 rdev_for_each(rdev, mddev)
6390 if (rdev->raid_disk >= 0)
6391 sysfs_unlink_rdev(mddev, rdev);
6393 set_capacity_and_notify(disk, 0);
6394 mutex_unlock(&mddev->open_mutex);
6400 mutex_unlock(&mddev->open_mutex);
6402 * Free resources if final stop
6405 pr_info("md: %s stopped.\n", mdname(mddev));
6407 if (mddev->bitmap_info.file) {
6408 struct file *f = mddev->bitmap_info.file;
6409 spin_lock(&mddev->lock);
6410 mddev->bitmap_info.file = NULL;
6411 spin_unlock(&mddev->lock);
6414 mddev->bitmap_info.offset = 0;
6416 export_array(mddev);
6419 if (mddev->hold_active == UNTIL_STOP)
6420 mddev->hold_active = 0;
6423 sysfs_notify_dirent_safe(mddev->sysfs_state);
6428 static void autorun_array(struct mddev *mddev)
6430 struct md_rdev *rdev;
6433 if (list_empty(&mddev->disks))
6436 pr_info("md: running: ");
6438 rdev_for_each(rdev, mddev) {
6439 pr_cont("<%pg>", rdev->bdev);
6443 err = do_md_run(mddev);
6445 pr_warn("md: do_md_run() returned %d\n", err);
6446 do_md_stop(mddev, 0, NULL);
6451 * lets try to run arrays based on all disks that have arrived
6452 * until now. (those are in pending_raid_disks)
6454 * the method: pick the first pending disk, collect all disks with
6455 * the same UUID, remove all from the pending list and put them into
6456 * the 'same_array' list. Then order this list based on superblock
6457 * update time (freshest comes first), kick out 'old' disks and
6458 * compare superblocks. If everything's fine then run it.
6460 * If "unit" is allocated, then bump its reference count
6462 static void autorun_devices(int part)
6464 struct md_rdev *rdev0, *rdev, *tmp;
6465 struct mddev *mddev;
6467 pr_info("md: autorun ...\n");
6468 while (!list_empty(&pending_raid_disks)) {
6471 LIST_HEAD(candidates);
6472 rdev0 = list_entry(pending_raid_disks.next,
6473 struct md_rdev, same_set);
6475 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6476 INIT_LIST_HEAD(&candidates);
6477 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6478 if (super_90_load(rdev, rdev0, 0) >= 0) {
6479 pr_debug("md: adding %pg ...\n",
6481 list_move(&rdev->same_set, &candidates);
6484 * now we have a set of devices, with all of them having
6485 * mostly sane superblocks. It's time to allocate the
6489 dev = MKDEV(mdp_major,
6490 rdev0->preferred_minor << MdpMinorShift);
6491 unit = MINOR(dev) >> MdpMinorShift;
6493 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6496 if (rdev0->preferred_minor != unit) {
6497 pr_warn("md: unit number in %pg is bad: %d\n",
6498 rdev0->bdev, rdev0->preferred_minor);
6503 mddev = mddev_find(dev);
6507 if (mddev_lock(mddev))
6508 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6509 else if (mddev->raid_disks || mddev->major_version
6510 || !list_empty(&mddev->disks)) {
6511 pr_warn("md: %s already running, cannot run %pg\n",
6512 mdname(mddev), rdev0->bdev);
6513 mddev_unlock(mddev);
6515 pr_debug("md: created %s\n", mdname(mddev));
6516 mddev->persistent = 1;
6517 rdev_for_each_list(rdev, tmp, &candidates) {
6518 list_del_init(&rdev->same_set);
6519 if (bind_rdev_to_array(rdev, mddev))
6522 autorun_array(mddev);
6523 mddev_unlock(mddev);
6525 /* on success, candidates will be empty, on error
6528 rdev_for_each_list(rdev, tmp, &candidates) {
6529 list_del_init(&rdev->same_set);
6534 pr_info("md: ... autorun DONE.\n");
6536 #endif /* !MODULE */
6538 static int get_version(void __user *arg)
6542 ver.major = MD_MAJOR_VERSION;
6543 ver.minor = MD_MINOR_VERSION;
6544 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6546 if (copy_to_user(arg, &ver, sizeof(ver)))
6552 static int get_array_info(struct mddev *mddev, void __user *arg)
6554 mdu_array_info_t info;
6555 int nr,working,insync,failed,spare;
6556 struct md_rdev *rdev;
6558 nr = working = insync = failed = spare = 0;
6560 rdev_for_each_rcu(rdev, mddev) {
6562 if (test_bit(Faulty, &rdev->flags))
6566 if (test_bit(In_sync, &rdev->flags))
6568 else if (test_bit(Journal, &rdev->flags))
6569 /* TODO: add journal count to md_u.h */
6577 info.major_version = mddev->major_version;
6578 info.minor_version = mddev->minor_version;
6579 info.patch_version = MD_PATCHLEVEL_VERSION;
6580 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6581 info.level = mddev->level;
6582 info.size = mddev->dev_sectors / 2;
6583 if (info.size != mddev->dev_sectors / 2) /* overflow */
6586 info.raid_disks = mddev->raid_disks;
6587 info.md_minor = mddev->md_minor;
6588 info.not_persistent= !mddev->persistent;
6590 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6593 info.state = (1<<MD_SB_CLEAN);
6594 if (mddev->bitmap && mddev->bitmap_info.offset)
6595 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6596 if (mddev_is_clustered(mddev))
6597 info.state |= (1<<MD_SB_CLUSTERED);
6598 info.active_disks = insync;
6599 info.working_disks = working;
6600 info.failed_disks = failed;
6601 info.spare_disks = spare;
6603 info.layout = mddev->layout;
6604 info.chunk_size = mddev->chunk_sectors << 9;
6606 if (copy_to_user(arg, &info, sizeof(info)))
6612 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6614 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6618 file = kzalloc(sizeof(*file), GFP_NOIO);
6623 spin_lock(&mddev->lock);
6624 /* bitmap enabled */
6625 if (mddev->bitmap_info.file) {
6626 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6627 sizeof(file->pathname));
6631 memmove(file->pathname, ptr,
6632 sizeof(file->pathname)-(ptr-file->pathname));
6634 spin_unlock(&mddev->lock);
6637 copy_to_user(arg, file, sizeof(*file)))
6644 static int get_disk_info(struct mddev *mddev, void __user * arg)
6646 mdu_disk_info_t info;
6647 struct md_rdev *rdev;
6649 if (copy_from_user(&info, arg, sizeof(info)))
6653 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6655 info.major = MAJOR(rdev->bdev->bd_dev);
6656 info.minor = MINOR(rdev->bdev->bd_dev);
6657 info.raid_disk = rdev->raid_disk;
6659 if (test_bit(Faulty, &rdev->flags))
6660 info.state |= (1<<MD_DISK_FAULTY);
6661 else if (test_bit(In_sync, &rdev->flags)) {
6662 info.state |= (1<<MD_DISK_ACTIVE);
6663 info.state |= (1<<MD_DISK_SYNC);
6665 if (test_bit(Journal, &rdev->flags))
6666 info.state |= (1<<MD_DISK_JOURNAL);
6667 if (test_bit(WriteMostly, &rdev->flags))
6668 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6669 if (test_bit(FailFast, &rdev->flags))
6670 info.state |= (1<<MD_DISK_FAILFAST);
6672 info.major = info.minor = 0;
6673 info.raid_disk = -1;
6674 info.state = (1<<MD_DISK_REMOVED);
6678 if (copy_to_user(arg, &info, sizeof(info)))
6684 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6686 struct md_rdev *rdev;
6687 dev_t dev = MKDEV(info->major,info->minor);
6689 if (mddev_is_clustered(mddev) &&
6690 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6691 pr_warn("%s: Cannot add to clustered mddev.\n",
6696 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6699 if (!mddev->raid_disks) {
6701 /* expecting a device which has a superblock */
6702 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6704 pr_warn("md: md_import_device returned %ld\n",
6706 return PTR_ERR(rdev);
6708 if (!list_empty(&mddev->disks)) {
6709 struct md_rdev *rdev0
6710 = list_entry(mddev->disks.next,
6711 struct md_rdev, same_set);
6712 err = super_types[mddev->major_version]
6713 .load_super(rdev, rdev0, mddev->minor_version);
6715 pr_warn("md: %pg has different UUID to %pg\n",
6722 err = bind_rdev_to_array(rdev, mddev);
6729 * md_add_new_disk can be used once the array is assembled
6730 * to add "hot spares". They must already have a superblock
6735 if (!mddev->pers->hot_add_disk) {
6736 pr_warn("%s: personality does not support diskops!\n",
6740 if (mddev->persistent)
6741 rdev = md_import_device(dev, mddev->major_version,
6742 mddev->minor_version);
6744 rdev = md_import_device(dev, -1, -1);
6746 pr_warn("md: md_import_device returned %ld\n",
6748 return PTR_ERR(rdev);
6750 /* set saved_raid_disk if appropriate */
6751 if (!mddev->persistent) {
6752 if (info->state & (1<<MD_DISK_SYNC) &&
6753 info->raid_disk < mddev->raid_disks) {
6754 rdev->raid_disk = info->raid_disk;
6755 set_bit(In_sync, &rdev->flags);
6756 clear_bit(Bitmap_sync, &rdev->flags);
6758 rdev->raid_disk = -1;
6759 rdev->saved_raid_disk = rdev->raid_disk;
6761 super_types[mddev->major_version].
6762 validate_super(mddev, rdev);
6763 if ((info->state & (1<<MD_DISK_SYNC)) &&
6764 rdev->raid_disk != info->raid_disk) {
6765 /* This was a hot-add request, but events doesn't
6766 * match, so reject it.
6772 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6773 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6774 set_bit(WriteMostly, &rdev->flags);
6776 clear_bit(WriteMostly, &rdev->flags);
6777 if (info->state & (1<<MD_DISK_FAILFAST))
6778 set_bit(FailFast, &rdev->flags);
6780 clear_bit(FailFast, &rdev->flags);
6782 if (info->state & (1<<MD_DISK_JOURNAL)) {
6783 struct md_rdev *rdev2;
6784 bool has_journal = false;
6786 /* make sure no existing journal disk */
6787 rdev_for_each(rdev2, mddev) {
6788 if (test_bit(Journal, &rdev2->flags)) {
6793 if (has_journal || mddev->bitmap) {
6797 set_bit(Journal, &rdev->flags);
6800 * check whether the device shows up in other nodes
6802 if (mddev_is_clustered(mddev)) {
6803 if (info->state & (1 << MD_DISK_CANDIDATE))
6804 set_bit(Candidate, &rdev->flags);
6805 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6806 /* --add initiated by this node */
6807 err = md_cluster_ops->add_new_disk(mddev, rdev);
6815 rdev->raid_disk = -1;
6816 err = bind_rdev_to_array(rdev, mddev);
6821 if (mddev_is_clustered(mddev)) {
6822 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6824 err = md_cluster_ops->new_disk_ack(mddev,
6827 md_kick_rdev_from_array(rdev);
6831 md_cluster_ops->add_new_disk_cancel(mddev);
6833 err = add_bound_rdev(rdev);
6837 err = add_bound_rdev(rdev);
6842 /* otherwise, md_add_new_disk is only allowed
6843 * for major_version==0 superblocks
6845 if (mddev->major_version != 0) {
6846 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6850 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6852 rdev = md_import_device(dev, -1, 0);
6854 pr_warn("md: error, md_import_device() returned %ld\n",
6856 return PTR_ERR(rdev);
6858 rdev->desc_nr = info->number;
6859 if (info->raid_disk < mddev->raid_disks)
6860 rdev->raid_disk = info->raid_disk;
6862 rdev->raid_disk = -1;
6864 if (rdev->raid_disk < mddev->raid_disks)
6865 if (info->state & (1<<MD_DISK_SYNC))
6866 set_bit(In_sync, &rdev->flags);
6868 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6869 set_bit(WriteMostly, &rdev->flags);
6870 if (info->state & (1<<MD_DISK_FAILFAST))
6871 set_bit(FailFast, &rdev->flags);
6873 if (!mddev->persistent) {
6874 pr_debug("md: nonpersistent superblock ...\n");
6875 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6877 rdev->sb_start = calc_dev_sboffset(rdev);
6878 rdev->sectors = rdev->sb_start;
6880 err = bind_rdev_to_array(rdev, mddev);
6890 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6892 struct md_rdev *rdev;
6897 rdev = find_rdev(mddev, dev);
6901 if (rdev->raid_disk < 0)
6904 clear_bit(Blocked, &rdev->flags);
6905 remove_and_add_spares(mddev, rdev);
6907 if (rdev->raid_disk >= 0)
6911 if (mddev_is_clustered(mddev)) {
6912 if (md_cluster_ops->remove_disk(mddev, rdev))
6916 md_kick_rdev_from_array(rdev);
6917 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6919 md_wakeup_thread(mddev->thread);
6921 md_update_sb(mddev, 1);
6926 pr_debug("md: cannot remove active disk %pg from %s ...\n",
6927 rdev->bdev, mdname(mddev));
6931 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6934 struct md_rdev *rdev;
6939 if (mddev->major_version != 0) {
6940 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6944 if (!mddev->pers->hot_add_disk) {
6945 pr_warn("%s: personality does not support diskops!\n",
6950 rdev = md_import_device(dev, -1, 0);
6952 pr_warn("md: error, md_import_device() returned %ld\n",
6957 if (mddev->persistent)
6958 rdev->sb_start = calc_dev_sboffset(rdev);
6960 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6962 rdev->sectors = rdev->sb_start;
6964 if (test_bit(Faulty, &rdev->flags)) {
6965 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
6966 rdev->bdev, mdname(mddev));
6971 clear_bit(In_sync, &rdev->flags);
6973 rdev->saved_raid_disk = -1;
6974 err = bind_rdev_to_array(rdev, mddev);
6979 * The rest should better be atomic, we can have disk failures
6980 * noticed in interrupt contexts ...
6983 rdev->raid_disk = -1;
6985 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6987 md_update_sb(mddev, 1);
6989 * If the new disk does not support REQ_NOWAIT,
6990 * disable on the whole MD.
6992 if (!blk_queue_nowait(bdev_get_queue(rdev->bdev))) {
6993 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
6994 mdname(mddev), rdev->bdev);
6995 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
6998 * Kick recovery, maybe this spare has to be added to the
6999 * array immediately.
7001 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7002 md_wakeup_thread(mddev->thread);
7011 static int set_bitmap_file(struct mddev *mddev, int fd)
7016 if (!mddev->pers->quiesce || !mddev->thread)
7018 if (mddev->recovery || mddev->sync_thread)
7020 /* we should be able to change the bitmap.. */
7024 struct inode *inode;
7027 if (mddev->bitmap || mddev->bitmap_info.file)
7028 return -EEXIST; /* cannot add when bitmap is present */
7032 pr_warn("%s: error: failed to get bitmap file\n",
7037 inode = f->f_mapping->host;
7038 if (!S_ISREG(inode->i_mode)) {
7039 pr_warn("%s: error: bitmap file must be a regular file\n",
7042 } else if (!(f->f_mode & FMODE_WRITE)) {
7043 pr_warn("%s: error: bitmap file must open for write\n",
7046 } else if (atomic_read(&inode->i_writecount) != 1) {
7047 pr_warn("%s: error: bitmap file is already in use\n",
7055 mddev->bitmap_info.file = f;
7056 mddev->bitmap_info.offset = 0; /* file overrides offset */
7057 } else if (mddev->bitmap == NULL)
7058 return -ENOENT; /* cannot remove what isn't there */
7062 struct bitmap *bitmap;
7064 bitmap = md_bitmap_create(mddev, -1);
7065 mddev_suspend(mddev);
7066 if (!IS_ERR(bitmap)) {
7067 mddev->bitmap = bitmap;
7068 err = md_bitmap_load(mddev);
7070 err = PTR_ERR(bitmap);
7072 md_bitmap_destroy(mddev);
7075 mddev_resume(mddev);
7076 } else if (fd < 0) {
7077 mddev_suspend(mddev);
7078 md_bitmap_destroy(mddev);
7079 mddev_resume(mddev);
7083 struct file *f = mddev->bitmap_info.file;
7085 spin_lock(&mddev->lock);
7086 mddev->bitmap_info.file = NULL;
7087 spin_unlock(&mddev->lock);
7096 * md_set_array_info is used two different ways
7097 * The original usage is when creating a new array.
7098 * In this usage, raid_disks is > 0 and it together with
7099 * level, size, not_persistent,layout,chunksize determine the
7100 * shape of the array.
7101 * This will always create an array with a type-0.90.0 superblock.
7102 * The newer usage is when assembling an array.
7103 * In this case raid_disks will be 0, and the major_version field is
7104 * use to determine which style super-blocks are to be found on the devices.
7105 * The minor and patch _version numbers are also kept incase the
7106 * super_block handler wishes to interpret them.
7108 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7110 if (info->raid_disks == 0) {
7111 /* just setting version number for superblock loading */
7112 if (info->major_version < 0 ||
7113 info->major_version >= ARRAY_SIZE(super_types) ||
7114 super_types[info->major_version].name == NULL) {
7115 /* maybe try to auto-load a module? */
7116 pr_warn("md: superblock version %d not known\n",
7117 info->major_version);
7120 mddev->major_version = info->major_version;
7121 mddev->minor_version = info->minor_version;
7122 mddev->patch_version = info->patch_version;
7123 mddev->persistent = !info->not_persistent;
7124 /* ensure mddev_put doesn't delete this now that there
7125 * is some minimal configuration.
7127 mddev->ctime = ktime_get_real_seconds();
7130 mddev->major_version = MD_MAJOR_VERSION;
7131 mddev->minor_version = MD_MINOR_VERSION;
7132 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7133 mddev->ctime = ktime_get_real_seconds();
7135 mddev->level = info->level;
7136 mddev->clevel[0] = 0;
7137 mddev->dev_sectors = 2 * (sector_t)info->size;
7138 mddev->raid_disks = info->raid_disks;
7139 /* don't set md_minor, it is determined by which /dev/md* was
7142 if (info->state & (1<<MD_SB_CLEAN))
7143 mddev->recovery_cp = MaxSector;
7145 mddev->recovery_cp = 0;
7146 mddev->persistent = ! info->not_persistent;
7147 mddev->external = 0;
7149 mddev->layout = info->layout;
7150 if (mddev->level == 0)
7151 /* Cannot trust RAID0 layout info here */
7153 mddev->chunk_sectors = info->chunk_size >> 9;
7155 if (mddev->persistent) {
7156 mddev->max_disks = MD_SB_DISKS;
7158 mddev->sb_flags = 0;
7160 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7162 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7163 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7164 mddev->bitmap_info.offset = 0;
7166 mddev->reshape_position = MaxSector;
7169 * Generate a 128 bit UUID
7171 get_random_bytes(mddev->uuid, 16);
7173 mddev->new_level = mddev->level;
7174 mddev->new_chunk_sectors = mddev->chunk_sectors;
7175 mddev->new_layout = mddev->layout;
7176 mddev->delta_disks = 0;
7177 mddev->reshape_backwards = 0;
7182 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7184 lockdep_assert_held(&mddev->reconfig_mutex);
7186 if (mddev->external_size)
7189 mddev->array_sectors = array_sectors;
7191 EXPORT_SYMBOL(md_set_array_sectors);
7193 static int update_size(struct mddev *mddev, sector_t num_sectors)
7195 struct md_rdev *rdev;
7197 int fit = (num_sectors == 0);
7198 sector_t old_dev_sectors = mddev->dev_sectors;
7200 if (mddev->pers->resize == NULL)
7202 /* The "num_sectors" is the number of sectors of each device that
7203 * is used. This can only make sense for arrays with redundancy.
7204 * linear and raid0 always use whatever space is available. We can only
7205 * consider changing this number if no resync or reconstruction is
7206 * happening, and if the new size is acceptable. It must fit before the
7207 * sb_start or, if that is <data_offset, it must fit before the size
7208 * of each device. If num_sectors is zero, we find the largest size
7211 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7217 rdev_for_each(rdev, mddev) {
7218 sector_t avail = rdev->sectors;
7220 if (fit && (num_sectors == 0 || num_sectors > avail))
7221 num_sectors = avail;
7222 if (avail < num_sectors)
7225 rv = mddev->pers->resize(mddev, num_sectors);
7227 if (mddev_is_clustered(mddev))
7228 md_cluster_ops->update_size(mddev, old_dev_sectors);
7229 else if (mddev->queue) {
7230 set_capacity_and_notify(mddev->gendisk,
7231 mddev->array_sectors);
7237 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7240 struct md_rdev *rdev;
7241 /* change the number of raid disks */
7242 if (mddev->pers->check_reshape == NULL)
7246 if (raid_disks <= 0 ||
7247 (mddev->max_disks && raid_disks >= mddev->max_disks))
7249 if (mddev->sync_thread ||
7250 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7251 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7252 mddev->reshape_position != MaxSector)
7255 rdev_for_each(rdev, mddev) {
7256 if (mddev->raid_disks < raid_disks &&
7257 rdev->data_offset < rdev->new_data_offset)
7259 if (mddev->raid_disks > raid_disks &&
7260 rdev->data_offset > rdev->new_data_offset)
7264 mddev->delta_disks = raid_disks - mddev->raid_disks;
7265 if (mddev->delta_disks < 0)
7266 mddev->reshape_backwards = 1;
7267 else if (mddev->delta_disks > 0)
7268 mddev->reshape_backwards = 0;
7270 rv = mddev->pers->check_reshape(mddev);
7272 mddev->delta_disks = 0;
7273 mddev->reshape_backwards = 0;
7279 * update_array_info is used to change the configuration of an
7281 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7282 * fields in the info are checked against the array.
7283 * Any differences that cannot be handled will cause an error.
7284 * Normally, only one change can be managed at a time.
7286 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7292 /* calculate expected state,ignoring low bits */
7293 if (mddev->bitmap && mddev->bitmap_info.offset)
7294 state |= (1 << MD_SB_BITMAP_PRESENT);
7296 if (mddev->major_version != info->major_version ||
7297 mddev->minor_version != info->minor_version ||
7298 /* mddev->patch_version != info->patch_version || */
7299 mddev->ctime != info->ctime ||
7300 mddev->level != info->level ||
7301 /* mddev->layout != info->layout || */
7302 mddev->persistent != !info->not_persistent ||
7303 mddev->chunk_sectors != info->chunk_size >> 9 ||
7304 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7305 ((state^info->state) & 0xfffffe00)
7308 /* Check there is only one change */
7309 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7311 if (mddev->raid_disks != info->raid_disks)
7313 if (mddev->layout != info->layout)
7315 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7322 if (mddev->layout != info->layout) {
7324 * we don't need to do anything at the md level, the
7325 * personality will take care of it all.
7327 if (mddev->pers->check_reshape == NULL)
7330 mddev->new_layout = info->layout;
7331 rv = mddev->pers->check_reshape(mddev);
7333 mddev->new_layout = mddev->layout;
7337 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7338 rv = update_size(mddev, (sector_t)info->size * 2);
7340 if (mddev->raid_disks != info->raid_disks)
7341 rv = update_raid_disks(mddev, info->raid_disks);
7343 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7344 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7348 if (mddev->recovery || mddev->sync_thread) {
7352 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7353 struct bitmap *bitmap;
7354 /* add the bitmap */
7355 if (mddev->bitmap) {
7359 if (mddev->bitmap_info.default_offset == 0) {
7363 mddev->bitmap_info.offset =
7364 mddev->bitmap_info.default_offset;
7365 mddev->bitmap_info.space =
7366 mddev->bitmap_info.default_space;
7367 bitmap = md_bitmap_create(mddev, -1);
7368 mddev_suspend(mddev);
7369 if (!IS_ERR(bitmap)) {
7370 mddev->bitmap = bitmap;
7371 rv = md_bitmap_load(mddev);
7373 rv = PTR_ERR(bitmap);
7375 md_bitmap_destroy(mddev);
7376 mddev_resume(mddev);
7378 /* remove the bitmap */
7379 if (!mddev->bitmap) {
7383 if (mddev->bitmap->storage.file) {
7387 if (mddev->bitmap_info.nodes) {
7388 /* hold PW on all the bitmap lock */
7389 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7390 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7392 md_cluster_ops->unlock_all_bitmaps(mddev);
7396 mddev->bitmap_info.nodes = 0;
7397 md_cluster_ops->leave(mddev);
7398 module_put(md_cluster_mod);
7399 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7401 mddev_suspend(mddev);
7402 md_bitmap_destroy(mddev);
7403 mddev_resume(mddev);
7404 mddev->bitmap_info.offset = 0;
7407 md_update_sb(mddev, 1);
7413 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7415 struct md_rdev *rdev;
7418 if (mddev->pers == NULL)
7422 rdev = md_find_rdev_rcu(mddev, dev);
7426 md_error(mddev, rdev);
7427 if (test_bit(MD_BROKEN, &mddev->flags))
7435 * We have a problem here : there is no easy way to give a CHS
7436 * virtual geometry. We currently pretend that we have a 2 heads
7437 * 4 sectors (with a BIG number of cylinders...). This drives
7438 * dosfs just mad... ;-)
7440 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7442 struct mddev *mddev = bdev->bd_disk->private_data;
7446 geo->cylinders = mddev->array_sectors / 8;
7450 static inline bool md_ioctl_valid(unsigned int cmd)
7454 case GET_ARRAY_INFO:
7455 case GET_BITMAP_FILE:
7458 case HOT_REMOVE_DISK:
7460 case RESTART_ARRAY_RW:
7462 case SET_ARRAY_INFO:
7463 case SET_BITMAP_FILE:
7464 case SET_DISK_FAULTY:
7467 case CLUSTERED_DISK_NACK:
7474 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7475 unsigned int cmd, unsigned long arg)
7478 void __user *argp = (void __user *)arg;
7479 struct mddev *mddev = NULL;
7480 bool did_set_md_closing = false;
7482 if (!md_ioctl_valid(cmd))
7487 case GET_ARRAY_INFO:
7491 if (!capable(CAP_SYS_ADMIN))
7496 * Commands dealing with the RAID driver but not any
7501 err = get_version(argp);
7507 * Commands creating/starting a new array:
7510 mddev = bdev->bd_disk->private_data;
7517 /* Some actions do not requires the mutex */
7519 case GET_ARRAY_INFO:
7520 if (!mddev->raid_disks && !mddev->external)
7523 err = get_array_info(mddev, argp);
7527 if (!mddev->raid_disks && !mddev->external)
7530 err = get_disk_info(mddev, argp);
7533 case SET_DISK_FAULTY:
7534 err = set_disk_faulty(mddev, new_decode_dev(arg));
7537 case GET_BITMAP_FILE:
7538 err = get_bitmap_file(mddev, argp);
7543 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7544 flush_rdev_wq(mddev);
7546 if (cmd == HOT_REMOVE_DISK)
7547 /* need to ensure recovery thread has run */
7548 wait_event_interruptible_timeout(mddev->sb_wait,
7549 !test_bit(MD_RECOVERY_NEEDED,
7551 msecs_to_jiffies(5000));
7552 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7553 /* Need to flush page cache, and ensure no-one else opens
7556 mutex_lock(&mddev->open_mutex);
7557 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7558 mutex_unlock(&mddev->open_mutex);
7562 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7563 mutex_unlock(&mddev->open_mutex);
7567 did_set_md_closing = true;
7568 mutex_unlock(&mddev->open_mutex);
7569 sync_blockdev(bdev);
7571 err = mddev_lock(mddev);
7573 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7578 if (cmd == SET_ARRAY_INFO) {
7579 mdu_array_info_t info;
7581 memset(&info, 0, sizeof(info));
7582 else if (copy_from_user(&info, argp, sizeof(info))) {
7587 err = update_array_info(mddev, &info);
7589 pr_warn("md: couldn't update array info. %d\n", err);
7594 if (!list_empty(&mddev->disks)) {
7595 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7599 if (mddev->raid_disks) {
7600 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7604 err = md_set_array_info(mddev, &info);
7606 pr_warn("md: couldn't set array info. %d\n", err);
7613 * Commands querying/configuring an existing array:
7615 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7616 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7617 if ((!mddev->raid_disks && !mddev->external)
7618 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7619 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7620 && cmd != GET_BITMAP_FILE) {
7626 * Commands even a read-only array can execute:
7629 case RESTART_ARRAY_RW:
7630 err = restart_array(mddev);
7634 err = do_md_stop(mddev, 0, bdev);
7638 err = md_set_readonly(mddev, bdev);
7641 case HOT_REMOVE_DISK:
7642 err = hot_remove_disk(mddev, new_decode_dev(arg));
7646 /* We can support ADD_NEW_DISK on read-only arrays
7647 * only if we are re-adding a preexisting device.
7648 * So require mddev->pers and MD_DISK_SYNC.
7651 mdu_disk_info_t info;
7652 if (copy_from_user(&info, argp, sizeof(info)))
7654 else if (!(info.state & (1<<MD_DISK_SYNC)))
7655 /* Need to clear read-only for this */
7658 err = md_add_new_disk(mddev, &info);
7665 * The remaining ioctls are changing the state of the
7666 * superblock, so we do not allow them on read-only arrays.
7668 if (mddev->ro && mddev->pers) {
7669 if (mddev->ro == 2) {
7671 sysfs_notify_dirent_safe(mddev->sysfs_state);
7672 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7673 /* mddev_unlock will wake thread */
7674 /* If a device failed while we were read-only, we
7675 * need to make sure the metadata is updated now.
7677 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7678 mddev_unlock(mddev);
7679 wait_event(mddev->sb_wait,
7680 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7681 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7682 mddev_lock_nointr(mddev);
7693 mdu_disk_info_t info;
7694 if (copy_from_user(&info, argp, sizeof(info)))
7697 err = md_add_new_disk(mddev, &info);
7701 case CLUSTERED_DISK_NACK:
7702 if (mddev_is_clustered(mddev))
7703 md_cluster_ops->new_disk_ack(mddev, false);
7709 err = hot_add_disk(mddev, new_decode_dev(arg));
7713 err = do_md_run(mddev);
7716 case SET_BITMAP_FILE:
7717 err = set_bitmap_file(mddev, (int)arg);
7726 if (mddev->hold_active == UNTIL_IOCTL &&
7728 mddev->hold_active = 0;
7729 mddev_unlock(mddev);
7731 if(did_set_md_closing)
7732 clear_bit(MD_CLOSING, &mddev->flags);
7735 #ifdef CONFIG_COMPAT
7736 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7737 unsigned int cmd, unsigned long arg)
7740 case HOT_REMOVE_DISK:
7742 case SET_DISK_FAULTY:
7743 case SET_BITMAP_FILE:
7744 /* These take in integer arg, do not convert */
7747 arg = (unsigned long)compat_ptr(arg);
7751 return md_ioctl(bdev, mode, cmd, arg);
7753 #endif /* CONFIG_COMPAT */
7755 static int md_set_read_only(struct block_device *bdev, bool ro)
7757 struct mddev *mddev = bdev->bd_disk->private_data;
7760 err = mddev_lock(mddev);
7764 if (!mddev->raid_disks && !mddev->external) {
7770 * Transitioning to read-auto need only happen for arrays that call
7771 * md_write_start and which are not ready for writes yet.
7773 if (!ro && mddev->ro == 1 && mddev->pers) {
7774 err = restart_array(mddev);
7781 mddev_unlock(mddev);
7785 static int md_open(struct block_device *bdev, fmode_t mode)
7788 * Succeed if we can lock the mddev, which confirms that
7789 * it isn't being stopped right now.
7791 struct mddev *mddev = mddev_find(bdev->bd_dev);
7797 if (mddev->gendisk != bdev->bd_disk) {
7798 /* we are racing with mddev_put which is discarding this
7802 /* Wait until bdev->bd_disk is definitely gone */
7803 if (work_pending(&mddev->del_work))
7804 flush_workqueue(md_misc_wq);
7807 BUG_ON(mddev != bdev->bd_disk->private_data);
7809 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7812 if (test_bit(MD_CLOSING, &mddev->flags)) {
7813 mutex_unlock(&mddev->open_mutex);
7819 atomic_inc(&mddev->openers);
7820 mutex_unlock(&mddev->open_mutex);
7822 bdev_check_media_change(bdev);
7829 static void md_release(struct gendisk *disk, fmode_t mode)
7831 struct mddev *mddev = disk->private_data;
7834 atomic_dec(&mddev->openers);
7838 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7840 struct mddev *mddev = disk->private_data;
7841 unsigned int ret = 0;
7844 ret = DISK_EVENT_MEDIA_CHANGE;
7849 const struct block_device_operations md_fops =
7851 .owner = THIS_MODULE,
7852 .submit_bio = md_submit_bio,
7854 .release = md_release,
7856 #ifdef CONFIG_COMPAT
7857 .compat_ioctl = md_compat_ioctl,
7859 .getgeo = md_getgeo,
7860 .check_events = md_check_events,
7861 .set_read_only = md_set_read_only,
7864 static int md_thread(void *arg)
7866 struct md_thread *thread = arg;
7869 * md_thread is a 'system-thread', it's priority should be very
7870 * high. We avoid resource deadlocks individually in each
7871 * raid personality. (RAID5 does preallocation) We also use RR and
7872 * the very same RT priority as kswapd, thus we will never get
7873 * into a priority inversion deadlock.
7875 * we definitely have to have equal or higher priority than
7876 * bdflush, otherwise bdflush will deadlock if there are too
7877 * many dirty RAID5 blocks.
7880 allow_signal(SIGKILL);
7881 while (!kthread_should_stop()) {
7883 /* We need to wait INTERRUPTIBLE so that
7884 * we don't add to the load-average.
7885 * That means we need to be sure no signals are
7888 if (signal_pending(current))
7889 flush_signals(current);
7891 wait_event_interruptible_timeout
7893 test_bit(THREAD_WAKEUP, &thread->flags)
7894 || kthread_should_stop() || kthread_should_park(),
7897 clear_bit(THREAD_WAKEUP, &thread->flags);
7898 if (kthread_should_park())
7900 if (!kthread_should_stop())
7901 thread->run(thread);
7907 void md_wakeup_thread(struct md_thread *thread)
7910 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7911 set_bit(THREAD_WAKEUP, &thread->flags);
7912 wake_up(&thread->wqueue);
7915 EXPORT_SYMBOL(md_wakeup_thread);
7917 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7918 struct mddev *mddev, const char *name)
7920 struct md_thread *thread;
7922 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7926 init_waitqueue_head(&thread->wqueue);
7929 thread->mddev = mddev;
7930 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7931 thread->tsk = kthread_run(md_thread, thread,
7933 mdname(thread->mddev),
7935 if (IS_ERR(thread->tsk)) {
7941 EXPORT_SYMBOL(md_register_thread);
7943 void md_unregister_thread(struct md_thread **threadp)
7945 struct md_thread *thread;
7948 * Locking ensures that mddev_unlock does not wake_up a
7949 * non-existent thread
7951 spin_lock(&pers_lock);
7954 spin_unlock(&pers_lock);
7958 spin_unlock(&pers_lock);
7960 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7961 kthread_stop(thread->tsk);
7964 EXPORT_SYMBOL(md_unregister_thread);
7966 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7968 if (!rdev || test_bit(Faulty, &rdev->flags))
7971 if (!mddev->pers || !mddev->pers->error_handler)
7973 mddev->pers->error_handler(mddev, rdev);
7975 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
7976 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7977 sysfs_notify_dirent_safe(rdev->sysfs_state);
7978 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7979 if (!test_bit(MD_BROKEN, &mddev->flags)) {
7980 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7981 md_wakeup_thread(mddev->thread);
7983 if (mddev->event_work.func)
7984 queue_work(md_misc_wq, &mddev->event_work);
7987 EXPORT_SYMBOL(md_error);
7989 /* seq_file implementation /proc/mdstat */
7991 static void status_unused(struct seq_file *seq)
7994 struct md_rdev *rdev;
7996 seq_printf(seq, "unused devices: ");
7998 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8000 seq_printf(seq, "%pg ", rdev->bdev);
8003 seq_printf(seq, "<none>");
8005 seq_printf(seq, "\n");
8008 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8010 sector_t max_sectors, resync, res;
8011 unsigned long dt, db = 0;
8012 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8013 int scale, recovery_active;
8014 unsigned int per_milli;
8016 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8017 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8018 max_sectors = mddev->resync_max_sectors;
8020 max_sectors = mddev->dev_sectors;
8022 resync = mddev->curr_resync;
8024 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8025 /* Still cleaning up */
8026 resync = max_sectors;
8027 } else if (resync > max_sectors)
8028 resync = max_sectors;
8030 resync -= atomic_read(&mddev->recovery_active);
8033 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8034 struct md_rdev *rdev;
8036 rdev_for_each(rdev, mddev)
8037 if (rdev->raid_disk >= 0 &&
8038 !test_bit(Faulty, &rdev->flags) &&
8039 rdev->recovery_offset != MaxSector &&
8040 rdev->recovery_offset) {
8041 seq_printf(seq, "\trecover=REMOTE");
8044 if (mddev->reshape_position != MaxSector)
8045 seq_printf(seq, "\treshape=REMOTE");
8047 seq_printf(seq, "\tresync=REMOTE");
8050 if (mddev->recovery_cp < MaxSector) {
8051 seq_printf(seq, "\tresync=PENDING");
8057 seq_printf(seq, "\tresync=DELAYED");
8061 WARN_ON(max_sectors == 0);
8062 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8063 * in a sector_t, and (max_sectors>>scale) will fit in a
8064 * u32, as those are the requirements for sector_div.
8065 * Thus 'scale' must be at least 10
8068 if (sizeof(sector_t) > sizeof(unsigned long)) {
8069 while ( max_sectors/2 > (1ULL<<(scale+32)))
8072 res = (resync>>scale)*1000;
8073 sector_div(res, (u32)((max_sectors>>scale)+1));
8077 int i, x = per_milli/50, y = 20-x;
8078 seq_printf(seq, "[");
8079 for (i = 0; i < x; i++)
8080 seq_printf(seq, "=");
8081 seq_printf(seq, ">");
8082 for (i = 0; i < y; i++)
8083 seq_printf(seq, ".");
8084 seq_printf(seq, "] ");
8086 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8087 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8089 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8091 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8092 "resync" : "recovery"))),
8093 per_milli/10, per_milli % 10,
8094 (unsigned long long) resync/2,
8095 (unsigned long long) max_sectors/2);
8098 * dt: time from mark until now
8099 * db: blocks written from mark until now
8100 * rt: remaining time
8102 * rt is a sector_t, which is always 64bit now. We are keeping
8103 * the original algorithm, but it is not really necessary.
8105 * Original algorithm:
8106 * So we divide before multiply in case it is 32bit and close
8108 * We scale the divisor (db) by 32 to avoid losing precision
8109 * near the end of resync when the number of remaining sectors
8111 * We then divide rt by 32 after multiplying by db to compensate.
8112 * The '+1' avoids division by zero if db is very small.
8114 dt = ((jiffies - mddev->resync_mark) / HZ);
8117 curr_mark_cnt = mddev->curr_mark_cnt;
8118 recovery_active = atomic_read(&mddev->recovery_active);
8119 resync_mark_cnt = mddev->resync_mark_cnt;
8121 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8122 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8124 rt = max_sectors - resync; /* number of remaining sectors */
8125 rt = div64_u64(rt, db/32+1);
8129 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8130 ((unsigned long)rt % 60)/6);
8132 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8136 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8138 struct list_head *tmp;
8140 struct mddev *mddev;
8152 spin_lock(&all_mddevs_lock);
8153 list_for_each(tmp,&all_mddevs)
8155 mddev = list_entry(tmp, struct mddev, all_mddevs);
8157 spin_unlock(&all_mddevs_lock);
8160 spin_unlock(&all_mddevs_lock);
8162 return (void*)2;/* tail */
8166 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8168 struct list_head *tmp;
8169 struct mddev *next_mddev, *mddev = v;
8175 spin_lock(&all_mddevs_lock);
8177 tmp = all_mddevs.next;
8179 tmp = mddev->all_mddevs.next;
8180 if (tmp != &all_mddevs)
8181 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8183 next_mddev = (void*)2;
8186 spin_unlock(&all_mddevs_lock);
8194 static void md_seq_stop(struct seq_file *seq, void *v)
8196 struct mddev *mddev = v;
8198 if (mddev && v != (void*)1 && v != (void*)2)
8202 static int md_seq_show(struct seq_file *seq, void *v)
8204 struct mddev *mddev = v;
8206 struct md_rdev *rdev;
8208 if (v == (void*)1) {
8209 struct md_personality *pers;
8210 seq_printf(seq, "Personalities : ");
8211 spin_lock(&pers_lock);
8212 list_for_each_entry(pers, &pers_list, list)
8213 seq_printf(seq, "[%s] ", pers->name);
8215 spin_unlock(&pers_lock);
8216 seq_printf(seq, "\n");
8217 seq->poll_event = atomic_read(&md_event_count);
8220 if (v == (void*)2) {
8225 spin_lock(&mddev->lock);
8226 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8227 seq_printf(seq, "%s : %sactive", mdname(mddev),
8228 mddev->pers ? "" : "in");
8231 seq_printf(seq, " (read-only)");
8233 seq_printf(seq, " (auto-read-only)");
8234 seq_printf(seq, " %s", mddev->pers->name);
8239 rdev_for_each_rcu(rdev, mddev) {
8240 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8242 if (test_bit(WriteMostly, &rdev->flags))
8243 seq_printf(seq, "(W)");
8244 if (test_bit(Journal, &rdev->flags))
8245 seq_printf(seq, "(J)");
8246 if (test_bit(Faulty, &rdev->flags)) {
8247 seq_printf(seq, "(F)");
8250 if (rdev->raid_disk < 0)
8251 seq_printf(seq, "(S)"); /* spare */
8252 if (test_bit(Replacement, &rdev->flags))
8253 seq_printf(seq, "(R)");
8254 sectors += rdev->sectors;
8258 if (!list_empty(&mddev->disks)) {
8260 seq_printf(seq, "\n %llu blocks",
8261 (unsigned long long)
8262 mddev->array_sectors / 2);
8264 seq_printf(seq, "\n %llu blocks",
8265 (unsigned long long)sectors / 2);
8267 if (mddev->persistent) {
8268 if (mddev->major_version != 0 ||
8269 mddev->minor_version != 90) {
8270 seq_printf(seq," super %d.%d",
8271 mddev->major_version,
8272 mddev->minor_version);
8274 } else if (mddev->external)
8275 seq_printf(seq, " super external:%s",
8276 mddev->metadata_type);
8278 seq_printf(seq, " super non-persistent");
8281 mddev->pers->status(seq, mddev);
8282 seq_printf(seq, "\n ");
8283 if (mddev->pers->sync_request) {
8284 if (status_resync(seq, mddev))
8285 seq_printf(seq, "\n ");
8288 seq_printf(seq, "\n ");
8290 md_bitmap_status(seq, mddev->bitmap);
8292 seq_printf(seq, "\n");
8294 spin_unlock(&mddev->lock);
8299 static const struct seq_operations md_seq_ops = {
8300 .start = md_seq_start,
8301 .next = md_seq_next,
8302 .stop = md_seq_stop,
8303 .show = md_seq_show,
8306 static int md_seq_open(struct inode *inode, struct file *file)
8308 struct seq_file *seq;
8311 error = seq_open(file, &md_seq_ops);
8315 seq = file->private_data;
8316 seq->poll_event = atomic_read(&md_event_count);
8320 static int md_unloading;
8321 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8323 struct seq_file *seq = filp->private_data;
8327 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8328 poll_wait(filp, &md_event_waiters, wait);
8330 /* always allow read */
8331 mask = EPOLLIN | EPOLLRDNORM;
8333 if (seq->poll_event != atomic_read(&md_event_count))
8334 mask |= EPOLLERR | EPOLLPRI;
8338 static const struct proc_ops mdstat_proc_ops = {
8339 .proc_open = md_seq_open,
8340 .proc_read = seq_read,
8341 .proc_lseek = seq_lseek,
8342 .proc_release = seq_release,
8343 .proc_poll = mdstat_poll,
8346 int register_md_personality(struct md_personality *p)
8348 pr_debug("md: %s personality registered for level %d\n",
8350 spin_lock(&pers_lock);
8351 list_add_tail(&p->list, &pers_list);
8352 spin_unlock(&pers_lock);
8355 EXPORT_SYMBOL(register_md_personality);
8357 int unregister_md_personality(struct md_personality *p)
8359 pr_debug("md: %s personality unregistered\n", p->name);
8360 spin_lock(&pers_lock);
8361 list_del_init(&p->list);
8362 spin_unlock(&pers_lock);
8365 EXPORT_SYMBOL(unregister_md_personality);
8367 int register_md_cluster_operations(struct md_cluster_operations *ops,
8368 struct module *module)
8371 spin_lock(&pers_lock);
8372 if (md_cluster_ops != NULL)
8375 md_cluster_ops = ops;
8376 md_cluster_mod = module;
8378 spin_unlock(&pers_lock);
8381 EXPORT_SYMBOL(register_md_cluster_operations);
8383 int unregister_md_cluster_operations(void)
8385 spin_lock(&pers_lock);
8386 md_cluster_ops = NULL;
8387 spin_unlock(&pers_lock);
8390 EXPORT_SYMBOL(unregister_md_cluster_operations);
8392 int md_setup_cluster(struct mddev *mddev, int nodes)
8395 if (!md_cluster_ops)
8396 request_module("md-cluster");
8397 spin_lock(&pers_lock);
8398 /* ensure module won't be unloaded */
8399 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8400 pr_warn("can't find md-cluster module or get its reference.\n");
8401 spin_unlock(&pers_lock);
8404 spin_unlock(&pers_lock);
8406 ret = md_cluster_ops->join(mddev, nodes);
8408 mddev->safemode_delay = 0;
8412 void md_cluster_stop(struct mddev *mddev)
8414 if (!md_cluster_ops)
8416 md_cluster_ops->leave(mddev);
8417 module_put(md_cluster_mod);
8420 static int is_mddev_idle(struct mddev *mddev, int init)
8422 struct md_rdev *rdev;
8428 rdev_for_each_rcu(rdev, mddev) {
8429 struct gendisk *disk = rdev->bdev->bd_disk;
8430 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8431 atomic_read(&disk->sync_io);
8432 /* sync IO will cause sync_io to increase before the disk_stats
8433 * as sync_io is counted when a request starts, and
8434 * disk_stats is counted when it completes.
8435 * So resync activity will cause curr_events to be smaller than
8436 * when there was no such activity.
8437 * non-sync IO will cause disk_stat to increase without
8438 * increasing sync_io so curr_events will (eventually)
8439 * be larger than it was before. Once it becomes
8440 * substantially larger, the test below will cause
8441 * the array to appear non-idle, and resync will slow
8443 * If there is a lot of outstanding resync activity when
8444 * we set last_event to curr_events, then all that activity
8445 * completing might cause the array to appear non-idle
8446 * and resync will be slowed down even though there might
8447 * not have been non-resync activity. This will only
8448 * happen once though. 'last_events' will soon reflect
8449 * the state where there is little or no outstanding
8450 * resync requests, and further resync activity will
8451 * always make curr_events less than last_events.
8454 if (init || curr_events - rdev->last_events > 64) {
8455 rdev->last_events = curr_events;
8463 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8465 /* another "blocks" (512byte) blocks have been synced */
8466 atomic_sub(blocks, &mddev->recovery_active);
8467 wake_up(&mddev->recovery_wait);
8469 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8470 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8471 md_wakeup_thread(mddev->thread);
8472 // stop recovery, signal do_sync ....
8475 EXPORT_SYMBOL(md_done_sync);
8477 /* md_write_start(mddev, bi)
8478 * If we need to update some array metadata (e.g. 'active' flag
8479 * in superblock) before writing, schedule a superblock update
8480 * and wait for it to complete.
8481 * A return value of 'false' means that the write wasn't recorded
8482 * and cannot proceed as the array is being suspend.
8484 bool md_write_start(struct mddev *mddev, struct bio *bi)
8488 if (bio_data_dir(bi) != WRITE)
8491 BUG_ON(mddev->ro == 1);
8492 if (mddev->ro == 2) {
8493 /* need to switch to read/write */
8495 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8496 md_wakeup_thread(mddev->thread);
8497 md_wakeup_thread(mddev->sync_thread);
8501 percpu_ref_get(&mddev->writes_pending);
8502 smp_mb(); /* Match smp_mb in set_in_sync() */
8503 if (mddev->safemode == 1)
8504 mddev->safemode = 0;
8505 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8506 if (mddev->in_sync || mddev->sync_checkers) {
8507 spin_lock(&mddev->lock);
8508 if (mddev->in_sync) {
8510 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8511 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8512 md_wakeup_thread(mddev->thread);
8515 spin_unlock(&mddev->lock);
8519 sysfs_notify_dirent_safe(mddev->sysfs_state);
8520 if (!mddev->has_superblocks)
8522 wait_event(mddev->sb_wait,
8523 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8525 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8526 percpu_ref_put(&mddev->writes_pending);
8531 EXPORT_SYMBOL(md_write_start);
8533 /* md_write_inc can only be called when md_write_start() has
8534 * already been called at least once of the current request.
8535 * It increments the counter and is useful when a single request
8536 * is split into several parts. Each part causes an increment and
8537 * so needs a matching md_write_end().
8538 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8539 * a spinlocked region.
8541 void md_write_inc(struct mddev *mddev, struct bio *bi)
8543 if (bio_data_dir(bi) != WRITE)
8545 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8546 percpu_ref_get(&mddev->writes_pending);
8548 EXPORT_SYMBOL(md_write_inc);
8550 void md_write_end(struct mddev *mddev)
8552 percpu_ref_put(&mddev->writes_pending);
8554 if (mddev->safemode == 2)
8555 md_wakeup_thread(mddev->thread);
8556 else if (mddev->safemode_delay)
8557 /* The roundup() ensures this only performs locking once
8558 * every ->safemode_delay jiffies
8560 mod_timer(&mddev->safemode_timer,
8561 roundup(jiffies, mddev->safemode_delay) +
8562 mddev->safemode_delay);
8565 EXPORT_SYMBOL(md_write_end);
8567 /* This is used by raid0 and raid10 */
8568 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8569 struct bio *bio, sector_t start, sector_t size)
8571 struct bio *discard_bio = NULL;
8573 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8574 &discard_bio) || !discard_bio)
8577 bio_chain(discard_bio, bio);
8578 bio_clone_blkg_association(discard_bio, bio);
8580 trace_block_bio_remap(discard_bio,
8581 disk_devt(mddev->gendisk),
8582 bio->bi_iter.bi_sector);
8583 submit_bio_noacct(discard_bio);
8585 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8587 int acct_bioset_init(struct mddev *mddev)
8591 if (!bioset_initialized(&mddev->io_acct_set))
8592 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
8593 offsetof(struct md_io_acct, bio_clone), 0);
8596 EXPORT_SYMBOL_GPL(acct_bioset_init);
8598 void acct_bioset_exit(struct mddev *mddev)
8600 bioset_exit(&mddev->io_acct_set);
8602 EXPORT_SYMBOL_GPL(acct_bioset_exit);
8604 static void md_end_io_acct(struct bio *bio)
8606 struct md_io_acct *md_io_acct = bio->bi_private;
8607 struct bio *orig_bio = md_io_acct->orig_bio;
8609 orig_bio->bi_status = bio->bi_status;
8611 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8613 bio_endio(orig_bio);
8617 * Used by personalities that don't already clone the bio and thus can't
8618 * easily add the timestamp to their extended bio structure.
8620 void md_account_bio(struct mddev *mddev, struct bio **bio)
8622 struct block_device *bdev = (*bio)->bi_bdev;
8623 struct md_io_acct *md_io_acct;
8626 if (!blk_queue_io_stat(bdev->bd_disk->queue))
8629 clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set);
8630 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8631 md_io_acct->orig_bio = *bio;
8632 md_io_acct->start_time = bio_start_io_acct(*bio);
8634 clone->bi_end_io = md_end_io_acct;
8635 clone->bi_private = md_io_acct;
8638 EXPORT_SYMBOL_GPL(md_account_bio);
8640 /* md_allow_write(mddev)
8641 * Calling this ensures that the array is marked 'active' so that writes
8642 * may proceed without blocking. It is important to call this before
8643 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8644 * Must be called with mddev_lock held.
8646 void md_allow_write(struct mddev *mddev)
8652 if (!mddev->pers->sync_request)
8655 spin_lock(&mddev->lock);
8656 if (mddev->in_sync) {
8658 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8659 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8660 if (mddev->safemode_delay &&
8661 mddev->safemode == 0)
8662 mddev->safemode = 1;
8663 spin_unlock(&mddev->lock);
8664 md_update_sb(mddev, 0);
8665 sysfs_notify_dirent_safe(mddev->sysfs_state);
8666 /* wait for the dirty state to be recorded in the metadata */
8667 wait_event(mddev->sb_wait,
8668 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8670 spin_unlock(&mddev->lock);
8672 EXPORT_SYMBOL_GPL(md_allow_write);
8674 #define SYNC_MARKS 10
8675 #define SYNC_MARK_STEP (3*HZ)
8676 #define UPDATE_FREQUENCY (5*60*HZ)
8677 void md_do_sync(struct md_thread *thread)
8679 struct mddev *mddev = thread->mddev;
8680 struct mddev *mddev2;
8681 unsigned int currspeed = 0, window;
8682 sector_t max_sectors,j, io_sectors, recovery_done;
8683 unsigned long mark[SYNC_MARKS];
8684 unsigned long update_time;
8685 sector_t mark_cnt[SYNC_MARKS];
8687 struct list_head *tmp;
8688 sector_t last_check;
8690 struct md_rdev *rdev;
8691 char *desc, *action = NULL;
8692 struct blk_plug plug;
8695 /* just incase thread restarts... */
8696 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8697 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8699 if (mddev->ro) {/* never try to sync a read-only array */
8700 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8704 if (mddev_is_clustered(mddev)) {
8705 ret = md_cluster_ops->resync_start(mddev);
8709 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8710 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8711 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8712 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8713 && ((unsigned long long)mddev->curr_resync_completed
8714 < (unsigned long long)mddev->resync_max_sectors))
8718 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8719 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8720 desc = "data-check";
8722 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8723 desc = "requested-resync";
8727 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8732 mddev->last_sync_action = action ?: desc;
8734 /* we overload curr_resync somewhat here.
8735 * 0 == not engaged in resync at all
8736 * 2 == checking that there is no conflict with another sync
8737 * 1 == like 2, but have yielded to allow conflicting resync to
8739 * other == active in resync - this many blocks
8741 * Before starting a resync we must have set curr_resync to
8742 * 2, and then checked that every "conflicting" array has curr_resync
8743 * less than ours. When we find one that is the same or higher
8744 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8745 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8746 * This will mean we have to start checking from the beginning again.
8751 int mddev2_minor = -1;
8752 mddev->curr_resync = 2;
8755 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8757 for_each_mddev(mddev2, tmp) {
8758 if (mddev2 == mddev)
8760 if (!mddev->parallel_resync
8761 && mddev2->curr_resync
8762 && match_mddev_units(mddev, mddev2)) {
8764 if (mddev < mddev2 && mddev->curr_resync == 2) {
8765 /* arbitrarily yield */
8766 mddev->curr_resync = 1;
8767 wake_up(&resync_wait);
8769 if (mddev > mddev2 && mddev->curr_resync == 1)
8770 /* no need to wait here, we can wait the next
8771 * time 'round when curr_resync == 2
8774 /* We need to wait 'interruptible' so as not to
8775 * contribute to the load average, and not to
8776 * be caught by 'softlockup'
8778 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8779 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8780 mddev2->curr_resync >= mddev->curr_resync) {
8781 if (mddev2_minor != mddev2->md_minor) {
8782 mddev2_minor = mddev2->md_minor;
8783 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8784 desc, mdname(mddev),
8788 if (signal_pending(current))
8789 flush_signals(current);
8791 finish_wait(&resync_wait, &wq);
8794 finish_wait(&resync_wait, &wq);
8797 } while (mddev->curr_resync < 2);
8800 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8801 /* resync follows the size requested by the personality,
8802 * which defaults to physical size, but can be virtual size
8804 max_sectors = mddev->resync_max_sectors;
8805 atomic64_set(&mddev->resync_mismatches, 0);
8806 /* we don't use the checkpoint if there's a bitmap */
8807 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8808 j = mddev->resync_min;
8809 else if (!mddev->bitmap)
8810 j = mddev->recovery_cp;
8812 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8813 max_sectors = mddev->resync_max_sectors;
8815 * If the original node aborts reshaping then we continue the
8816 * reshaping, so set j again to avoid restart reshape from the
8819 if (mddev_is_clustered(mddev) &&
8820 mddev->reshape_position != MaxSector)
8821 j = mddev->reshape_position;
8823 /* recovery follows the physical size of devices */
8824 max_sectors = mddev->dev_sectors;
8827 rdev_for_each_rcu(rdev, mddev)
8828 if (rdev->raid_disk >= 0 &&
8829 !test_bit(Journal, &rdev->flags) &&
8830 !test_bit(Faulty, &rdev->flags) &&
8831 !test_bit(In_sync, &rdev->flags) &&
8832 rdev->recovery_offset < j)
8833 j = rdev->recovery_offset;
8836 /* If there is a bitmap, we need to make sure all
8837 * writes that started before we added a spare
8838 * complete before we start doing a recovery.
8839 * Otherwise the write might complete and (via
8840 * bitmap_endwrite) set a bit in the bitmap after the
8841 * recovery has checked that bit and skipped that
8844 if (mddev->bitmap) {
8845 mddev->pers->quiesce(mddev, 1);
8846 mddev->pers->quiesce(mddev, 0);
8850 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8851 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8852 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8853 speed_max(mddev), desc);
8855 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8858 for (m = 0; m < SYNC_MARKS; m++) {
8860 mark_cnt[m] = io_sectors;
8863 mddev->resync_mark = mark[last_mark];
8864 mddev->resync_mark_cnt = mark_cnt[last_mark];
8867 * Tune reconstruction:
8869 window = 32 * (PAGE_SIZE / 512);
8870 pr_debug("md: using %dk window, over a total of %lluk.\n",
8871 window/2, (unsigned long long)max_sectors/2);
8873 atomic_set(&mddev->recovery_active, 0);
8877 pr_debug("md: resuming %s of %s from checkpoint.\n",
8878 desc, mdname(mddev));
8879 mddev->curr_resync = j;
8881 mddev->curr_resync = 3; /* no longer delayed */
8882 mddev->curr_resync_completed = j;
8883 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8885 update_time = jiffies;
8887 blk_start_plug(&plug);
8888 while (j < max_sectors) {
8893 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8894 ((mddev->curr_resync > mddev->curr_resync_completed &&
8895 (mddev->curr_resync - mddev->curr_resync_completed)
8896 > (max_sectors >> 4)) ||
8897 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8898 (j - mddev->curr_resync_completed)*2
8899 >= mddev->resync_max - mddev->curr_resync_completed ||
8900 mddev->curr_resync_completed > mddev->resync_max
8902 /* time to update curr_resync_completed */
8903 wait_event(mddev->recovery_wait,
8904 atomic_read(&mddev->recovery_active) == 0);
8905 mddev->curr_resync_completed = j;
8906 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8907 j > mddev->recovery_cp)
8908 mddev->recovery_cp = j;
8909 update_time = jiffies;
8910 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8911 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8914 while (j >= mddev->resync_max &&
8915 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8916 /* As this condition is controlled by user-space,
8917 * we can block indefinitely, so use '_interruptible'
8918 * to avoid triggering warnings.
8920 flush_signals(current); /* just in case */
8921 wait_event_interruptible(mddev->recovery_wait,
8922 mddev->resync_max > j
8923 || test_bit(MD_RECOVERY_INTR,
8927 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8930 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8932 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8936 if (!skipped) { /* actual IO requested */
8937 io_sectors += sectors;
8938 atomic_add(sectors, &mddev->recovery_active);
8941 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8945 if (j > max_sectors)
8946 /* when skipping, extra large numbers can be returned. */
8949 mddev->curr_resync = j;
8950 mddev->curr_mark_cnt = io_sectors;
8951 if (last_check == 0)
8952 /* this is the earliest that rebuild will be
8953 * visible in /proc/mdstat
8957 if (last_check + window > io_sectors || j == max_sectors)
8960 last_check = io_sectors;
8962 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8964 int next = (last_mark+1) % SYNC_MARKS;
8966 mddev->resync_mark = mark[next];
8967 mddev->resync_mark_cnt = mark_cnt[next];
8968 mark[next] = jiffies;
8969 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8973 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8977 * this loop exits only if either when we are slower than
8978 * the 'hard' speed limit, or the system was IO-idle for
8980 * the system might be non-idle CPU-wise, but we only care
8981 * about not overloading the IO subsystem. (things like an
8982 * e2fsck being done on the RAID array should execute fast)
8986 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8987 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8988 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8990 if (currspeed > speed_min(mddev)) {
8991 if (currspeed > speed_max(mddev)) {
8995 if (!is_mddev_idle(mddev, 0)) {
8997 * Give other IO more of a chance.
8998 * The faster the devices, the less we wait.
9000 wait_event(mddev->recovery_wait,
9001 !atomic_read(&mddev->recovery_active));
9005 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9006 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9007 ? "interrupted" : "done");
9009 * this also signals 'finished resyncing' to md_stop
9011 blk_finish_plug(&plug);
9012 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9014 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9015 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9016 mddev->curr_resync > 3) {
9017 mddev->curr_resync_completed = mddev->curr_resync;
9018 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9020 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9022 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9023 mddev->curr_resync > 3) {
9024 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9025 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9026 if (mddev->curr_resync >= mddev->recovery_cp) {
9027 pr_debug("md: checkpointing %s of %s.\n",
9028 desc, mdname(mddev));
9029 if (test_bit(MD_RECOVERY_ERROR,
9031 mddev->recovery_cp =
9032 mddev->curr_resync_completed;
9034 mddev->recovery_cp =
9038 mddev->recovery_cp = MaxSector;
9040 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9041 mddev->curr_resync = MaxSector;
9042 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9043 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9045 rdev_for_each_rcu(rdev, mddev)
9046 if (rdev->raid_disk >= 0 &&
9047 mddev->delta_disks >= 0 &&
9048 !test_bit(Journal, &rdev->flags) &&
9049 !test_bit(Faulty, &rdev->flags) &&
9050 !test_bit(In_sync, &rdev->flags) &&
9051 rdev->recovery_offset < mddev->curr_resync)
9052 rdev->recovery_offset = mddev->curr_resync;
9058 /* set CHANGE_PENDING here since maybe another update is needed,
9059 * so other nodes are informed. It should be harmless for normal
9061 set_mask_bits(&mddev->sb_flags, 0,
9062 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9064 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9065 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9066 mddev->delta_disks > 0 &&
9067 mddev->pers->finish_reshape &&
9068 mddev->pers->size &&
9070 mddev_lock_nointr(mddev);
9071 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9072 mddev_unlock(mddev);
9073 if (!mddev_is_clustered(mddev))
9074 set_capacity_and_notify(mddev->gendisk,
9075 mddev->array_sectors);
9078 spin_lock(&mddev->lock);
9079 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9080 /* We completed so min/max setting can be forgotten if used. */
9081 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9082 mddev->resync_min = 0;
9083 mddev->resync_max = MaxSector;
9084 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9085 mddev->resync_min = mddev->curr_resync_completed;
9086 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9087 mddev->curr_resync = 0;
9088 spin_unlock(&mddev->lock);
9090 wake_up(&resync_wait);
9091 md_wakeup_thread(mddev->thread);
9094 EXPORT_SYMBOL_GPL(md_do_sync);
9096 static int remove_and_add_spares(struct mddev *mddev,
9097 struct md_rdev *this)
9099 struct md_rdev *rdev;
9102 bool remove_some = false;
9104 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9105 /* Mustn't remove devices when resync thread is running */
9108 rdev_for_each(rdev, mddev) {
9109 if ((this == NULL || rdev == this) &&
9110 rdev->raid_disk >= 0 &&
9111 !test_bit(Blocked, &rdev->flags) &&
9112 test_bit(Faulty, &rdev->flags) &&
9113 atomic_read(&rdev->nr_pending)==0) {
9114 /* Faulty non-Blocked devices with nr_pending == 0
9115 * never get nr_pending incremented,
9116 * never get Faulty cleared, and never get Blocked set.
9117 * So we can synchronize_rcu now rather than once per device
9120 set_bit(RemoveSynchronized, &rdev->flags);
9126 rdev_for_each(rdev, mddev) {
9127 if ((this == NULL || rdev == this) &&
9128 rdev->raid_disk >= 0 &&
9129 !test_bit(Blocked, &rdev->flags) &&
9130 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9131 (!test_bit(In_sync, &rdev->flags) &&
9132 !test_bit(Journal, &rdev->flags))) &&
9133 atomic_read(&rdev->nr_pending)==0)) {
9134 if (mddev->pers->hot_remove_disk(
9135 mddev, rdev) == 0) {
9136 sysfs_unlink_rdev(mddev, rdev);
9137 rdev->saved_raid_disk = rdev->raid_disk;
9138 rdev->raid_disk = -1;
9142 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9143 clear_bit(RemoveSynchronized, &rdev->flags);
9146 if (removed && mddev->kobj.sd)
9147 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9149 if (this && removed)
9152 rdev_for_each(rdev, mddev) {
9153 if (this && this != rdev)
9155 if (test_bit(Candidate, &rdev->flags))
9157 if (rdev->raid_disk >= 0 &&
9158 !test_bit(In_sync, &rdev->flags) &&
9159 !test_bit(Journal, &rdev->flags) &&
9160 !test_bit(Faulty, &rdev->flags))
9162 if (rdev->raid_disk >= 0)
9164 if (test_bit(Faulty, &rdev->flags))
9166 if (!test_bit(Journal, &rdev->flags)) {
9168 ! (rdev->saved_raid_disk >= 0 &&
9169 !test_bit(Bitmap_sync, &rdev->flags)))
9172 rdev->recovery_offset = 0;
9174 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9175 /* failure here is OK */
9176 sysfs_link_rdev(mddev, rdev);
9177 if (!test_bit(Journal, &rdev->flags))
9180 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9185 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9189 static void md_start_sync(struct work_struct *ws)
9191 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9193 mddev->sync_thread = md_register_thread(md_do_sync,
9196 if (!mddev->sync_thread) {
9197 pr_warn("%s: could not start resync thread...\n",
9199 /* leave the spares where they are, it shouldn't hurt */
9200 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9201 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9202 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9203 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9204 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9205 wake_up(&resync_wait);
9206 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9208 if (mddev->sysfs_action)
9209 sysfs_notify_dirent_safe(mddev->sysfs_action);
9211 md_wakeup_thread(mddev->sync_thread);
9212 sysfs_notify_dirent_safe(mddev->sysfs_action);
9217 * This routine is regularly called by all per-raid-array threads to
9218 * deal with generic issues like resync and super-block update.
9219 * Raid personalities that don't have a thread (linear/raid0) do not
9220 * need this as they never do any recovery or update the superblock.
9222 * It does not do any resync itself, but rather "forks" off other threads
9223 * to do that as needed.
9224 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9225 * "->recovery" and create a thread at ->sync_thread.
9226 * When the thread finishes it sets MD_RECOVERY_DONE
9227 * and wakeups up this thread which will reap the thread and finish up.
9228 * This thread also removes any faulty devices (with nr_pending == 0).
9230 * The overall approach is:
9231 * 1/ if the superblock needs updating, update it.
9232 * 2/ If a recovery thread is running, don't do anything else.
9233 * 3/ If recovery has finished, clean up, possibly marking spares active.
9234 * 4/ If there are any faulty devices, remove them.
9235 * 5/ If array is degraded, try to add spares devices
9236 * 6/ If array has spares or is not in-sync, start a resync thread.
9238 void md_check_recovery(struct mddev *mddev)
9240 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9241 /* Write superblock - thread that called mddev_suspend()
9242 * holds reconfig_mutex for us.
9244 set_bit(MD_UPDATING_SB, &mddev->flags);
9245 smp_mb__after_atomic();
9246 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9247 md_update_sb(mddev, 0);
9248 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9249 wake_up(&mddev->sb_wait);
9252 if (mddev->suspended)
9256 md_bitmap_daemon_work(mddev);
9258 if (signal_pending(current)) {
9259 if (mddev->pers->sync_request && !mddev->external) {
9260 pr_debug("md: %s in immediate safe mode\n",
9262 mddev->safemode = 2;
9264 flush_signals(current);
9267 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9270 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9271 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9272 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9273 (mddev->external == 0 && mddev->safemode == 1) ||
9274 (mddev->safemode == 2
9275 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9279 if (mddev_trylock(mddev)) {
9281 bool try_set_sync = mddev->safemode != 0;
9283 if (!mddev->external && mddev->safemode == 1)
9284 mddev->safemode = 0;
9287 struct md_rdev *rdev;
9288 if (!mddev->external && mddev->in_sync)
9289 /* 'Blocked' flag not needed as failed devices
9290 * will be recorded if array switched to read/write.
9291 * Leaving it set will prevent the device
9292 * from being removed.
9294 rdev_for_each(rdev, mddev)
9295 clear_bit(Blocked, &rdev->flags);
9296 /* On a read-only array we can:
9297 * - remove failed devices
9298 * - add already-in_sync devices if the array itself
9300 * As we only add devices that are already in-sync,
9301 * we can activate the spares immediately.
9303 remove_and_add_spares(mddev, NULL);
9304 /* There is no thread, but we need to call
9305 * ->spare_active and clear saved_raid_disk
9307 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9308 md_reap_sync_thread(mddev);
9309 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9310 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9311 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9315 if (mddev_is_clustered(mddev)) {
9316 struct md_rdev *rdev, *tmp;
9317 /* kick the device if another node issued a
9320 rdev_for_each_safe(rdev, tmp, mddev) {
9321 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9322 rdev->raid_disk < 0)
9323 md_kick_rdev_from_array(rdev);
9327 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9328 spin_lock(&mddev->lock);
9330 spin_unlock(&mddev->lock);
9333 if (mddev->sb_flags)
9334 md_update_sb(mddev, 0);
9336 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9337 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9338 /* resync/recovery still happening */
9339 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9342 if (mddev->sync_thread) {
9343 md_reap_sync_thread(mddev);
9346 /* Set RUNNING before clearing NEEDED to avoid
9347 * any transients in the value of "sync_action".
9349 mddev->curr_resync_completed = 0;
9350 spin_lock(&mddev->lock);
9351 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9352 spin_unlock(&mddev->lock);
9353 /* Clear some bits that don't mean anything, but
9356 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9357 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9359 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9360 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9362 /* no recovery is running.
9363 * remove any failed drives, then
9364 * add spares if possible.
9365 * Spares are also removed and re-added, to allow
9366 * the personality to fail the re-add.
9369 if (mddev->reshape_position != MaxSector) {
9370 if (mddev->pers->check_reshape == NULL ||
9371 mddev->pers->check_reshape(mddev) != 0)
9372 /* Cannot proceed */
9374 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9375 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9376 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9377 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9378 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9379 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9380 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9381 } else if (mddev->recovery_cp < MaxSector) {
9382 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9383 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9384 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9385 /* nothing to be done ... */
9388 if (mddev->pers->sync_request) {
9390 /* We are adding a device or devices to an array
9391 * which has the bitmap stored on all devices.
9392 * So make sure all bitmap pages get written
9394 md_bitmap_write_all(mddev->bitmap);
9396 INIT_WORK(&mddev->del_work, md_start_sync);
9397 queue_work(md_misc_wq, &mddev->del_work);
9401 if (!mddev->sync_thread) {
9402 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9403 wake_up(&resync_wait);
9404 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9406 if (mddev->sysfs_action)
9407 sysfs_notify_dirent_safe(mddev->sysfs_action);
9410 wake_up(&mddev->sb_wait);
9411 mddev_unlock(mddev);
9414 EXPORT_SYMBOL(md_check_recovery);
9416 void md_reap_sync_thread(struct mddev *mddev)
9418 struct md_rdev *rdev;
9419 sector_t old_dev_sectors = mddev->dev_sectors;
9420 bool is_reshaped = false;
9422 /* resync has finished, collect result */
9423 md_unregister_thread(&mddev->sync_thread);
9424 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9425 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9426 mddev->degraded != mddev->raid_disks) {
9428 /* activate any spares */
9429 if (mddev->pers->spare_active(mddev)) {
9430 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9431 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9434 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9435 mddev->pers->finish_reshape) {
9436 mddev->pers->finish_reshape(mddev);
9437 if (mddev_is_clustered(mddev))
9441 /* If array is no-longer degraded, then any saved_raid_disk
9442 * information must be scrapped.
9444 if (!mddev->degraded)
9445 rdev_for_each(rdev, mddev)
9446 rdev->saved_raid_disk = -1;
9448 md_update_sb(mddev, 1);
9449 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9450 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9452 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9453 md_cluster_ops->resync_finish(mddev);
9454 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9455 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9456 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9457 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9458 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9459 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9461 * We call md_cluster_ops->update_size here because sync_size could
9462 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9463 * so it is time to update size across cluster.
9465 if (mddev_is_clustered(mddev) && is_reshaped
9466 && !test_bit(MD_CLOSING, &mddev->flags))
9467 md_cluster_ops->update_size(mddev, old_dev_sectors);
9468 wake_up(&resync_wait);
9469 /* flag recovery needed just to double check */
9470 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9471 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9472 sysfs_notify_dirent_safe(mddev->sysfs_action);
9474 if (mddev->event_work.func)
9475 queue_work(md_misc_wq, &mddev->event_work);
9477 EXPORT_SYMBOL(md_reap_sync_thread);
9479 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9481 sysfs_notify_dirent_safe(rdev->sysfs_state);
9482 wait_event_timeout(rdev->blocked_wait,
9483 !test_bit(Blocked, &rdev->flags) &&
9484 !test_bit(BlockedBadBlocks, &rdev->flags),
9485 msecs_to_jiffies(5000));
9486 rdev_dec_pending(rdev, mddev);
9488 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9490 void md_finish_reshape(struct mddev *mddev)
9492 /* called be personality module when reshape completes. */
9493 struct md_rdev *rdev;
9495 rdev_for_each(rdev, mddev) {
9496 if (rdev->data_offset > rdev->new_data_offset)
9497 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9499 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9500 rdev->data_offset = rdev->new_data_offset;
9503 EXPORT_SYMBOL(md_finish_reshape);
9505 /* Bad block management */
9507 /* Returns 1 on success, 0 on failure */
9508 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9511 struct mddev *mddev = rdev->mddev;
9514 s += rdev->new_data_offset;
9516 s += rdev->data_offset;
9517 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9519 /* Make sure they get written out promptly */
9520 if (test_bit(ExternalBbl, &rdev->flags))
9521 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9522 sysfs_notify_dirent_safe(rdev->sysfs_state);
9523 set_mask_bits(&mddev->sb_flags, 0,
9524 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9525 md_wakeup_thread(rdev->mddev->thread);
9530 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9532 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9537 s += rdev->new_data_offset;
9539 s += rdev->data_offset;
9540 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9541 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9542 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9545 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9547 static int md_notify_reboot(struct notifier_block *this,
9548 unsigned long code, void *x)
9550 struct list_head *tmp;
9551 struct mddev *mddev;
9554 for_each_mddev(mddev, tmp) {
9555 if (mddev_trylock(mddev)) {
9557 __md_stop_writes(mddev);
9558 if (mddev->persistent)
9559 mddev->safemode = 2;
9560 mddev_unlock(mddev);
9565 * certain more exotic SCSI devices are known to be
9566 * volatile wrt too early system reboots. While the
9567 * right place to handle this issue is the given
9568 * driver, we do want to have a safe RAID driver ...
9576 static struct notifier_block md_notifier = {
9577 .notifier_call = md_notify_reboot,
9579 .priority = INT_MAX, /* before any real devices */
9582 static void md_geninit(void)
9584 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9586 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9589 static int __init md_init(void)
9593 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9597 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9601 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9602 if (!md_rdev_misc_wq)
9603 goto err_rdev_misc_wq;
9605 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9609 ret = __register_blkdev(0, "mdp", md_probe);
9614 register_reboot_notifier(&md_notifier);
9615 raid_table_header = register_sysctl_table(raid_root_table);
9621 unregister_blkdev(MD_MAJOR, "md");
9623 destroy_workqueue(md_rdev_misc_wq);
9625 destroy_workqueue(md_misc_wq);
9627 destroy_workqueue(md_wq);
9632 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9634 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9635 struct md_rdev *rdev2, *tmp;
9639 * If size is changed in another node then we need to
9640 * do resize as well.
9642 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9643 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9645 pr_info("md-cluster: resize failed\n");
9647 md_bitmap_update_sb(mddev->bitmap);
9650 /* Check for change of roles in the active devices */
9651 rdev_for_each_safe(rdev2, tmp, mddev) {
9652 if (test_bit(Faulty, &rdev2->flags))
9655 /* Check if the roles changed */
9656 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9658 if (test_bit(Candidate, &rdev2->flags)) {
9659 if (role == MD_DISK_ROLE_FAULTY) {
9660 pr_info("md: Removing Candidate device %pg because add failed\n",
9662 md_kick_rdev_from_array(rdev2);
9666 clear_bit(Candidate, &rdev2->flags);
9669 if (role != rdev2->raid_disk) {
9671 * got activated except reshape is happening.
9673 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9674 !(le32_to_cpu(sb->feature_map) &
9675 MD_FEATURE_RESHAPE_ACTIVE)) {
9676 rdev2->saved_raid_disk = role;
9677 ret = remove_and_add_spares(mddev, rdev2);
9678 pr_info("Activated spare: %pg\n",
9680 /* wakeup mddev->thread here, so array could
9681 * perform resync with the new activated disk */
9682 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9683 md_wakeup_thread(mddev->thread);
9686 * We just want to do the minimum to mark the disk
9687 * as faulty. The recovery is performed by the
9688 * one who initiated the error.
9690 if (role == MD_DISK_ROLE_FAULTY ||
9691 role == MD_DISK_ROLE_JOURNAL) {
9692 md_error(mddev, rdev2);
9693 clear_bit(Blocked, &rdev2->flags);
9698 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9699 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9701 pr_warn("md: updating array disks failed. %d\n", ret);
9705 * Since mddev->delta_disks has already updated in update_raid_disks,
9706 * so it is time to check reshape.
9708 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9709 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9711 * reshape is happening in the remote node, we need to
9712 * update reshape_position and call start_reshape.
9714 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9715 if (mddev->pers->update_reshape_pos)
9716 mddev->pers->update_reshape_pos(mddev);
9717 if (mddev->pers->start_reshape)
9718 mddev->pers->start_reshape(mddev);
9719 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9720 mddev->reshape_position != MaxSector &&
9721 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9722 /* reshape is just done in another node. */
9723 mddev->reshape_position = MaxSector;
9724 if (mddev->pers->update_reshape_pos)
9725 mddev->pers->update_reshape_pos(mddev);
9728 /* Finally set the event to be up to date */
9729 mddev->events = le64_to_cpu(sb->events);
9732 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9735 struct page *swapout = rdev->sb_page;
9736 struct mdp_superblock_1 *sb;
9738 /* Store the sb page of the rdev in the swapout temporary
9739 * variable in case we err in the future
9741 rdev->sb_page = NULL;
9742 err = alloc_disk_sb(rdev);
9744 ClearPageUptodate(rdev->sb_page);
9745 rdev->sb_loaded = 0;
9746 err = super_types[mddev->major_version].
9747 load_super(rdev, NULL, mddev->minor_version);
9750 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9751 __func__, __LINE__, rdev->desc_nr, err);
9753 put_page(rdev->sb_page);
9754 rdev->sb_page = swapout;
9755 rdev->sb_loaded = 1;
9759 sb = page_address(rdev->sb_page);
9760 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9764 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9765 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9767 /* The other node finished recovery, call spare_active to set
9768 * device In_sync and mddev->degraded
9770 if (rdev->recovery_offset == MaxSector &&
9771 !test_bit(In_sync, &rdev->flags) &&
9772 mddev->pers->spare_active(mddev))
9773 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9779 void md_reload_sb(struct mddev *mddev, int nr)
9781 struct md_rdev *rdev = NULL, *iter;
9785 rdev_for_each_rcu(iter, mddev) {
9786 if (iter->desc_nr == nr) {
9793 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9797 err = read_rdev(mddev, rdev);
9801 check_sb_changes(mddev, rdev);
9803 /* Read all rdev's to update recovery_offset */
9804 rdev_for_each_rcu(rdev, mddev) {
9805 if (!test_bit(Faulty, &rdev->flags))
9806 read_rdev(mddev, rdev);
9809 EXPORT_SYMBOL(md_reload_sb);
9814 * Searches all registered partitions for autorun RAID arrays
9818 static DEFINE_MUTEX(detected_devices_mutex);
9819 static LIST_HEAD(all_detected_devices);
9820 struct detected_devices_node {
9821 struct list_head list;
9825 void md_autodetect_dev(dev_t dev)
9827 struct detected_devices_node *node_detected_dev;
9829 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9830 if (node_detected_dev) {
9831 node_detected_dev->dev = dev;
9832 mutex_lock(&detected_devices_mutex);
9833 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9834 mutex_unlock(&detected_devices_mutex);
9838 void md_autostart_arrays(int part)
9840 struct md_rdev *rdev;
9841 struct detected_devices_node *node_detected_dev;
9843 int i_scanned, i_passed;
9848 pr_info("md: Autodetecting RAID arrays.\n");
9850 mutex_lock(&detected_devices_mutex);
9851 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9853 node_detected_dev = list_entry(all_detected_devices.next,
9854 struct detected_devices_node, list);
9855 list_del(&node_detected_dev->list);
9856 dev = node_detected_dev->dev;
9857 kfree(node_detected_dev);
9858 mutex_unlock(&detected_devices_mutex);
9859 rdev = md_import_device(dev,0, 90);
9860 mutex_lock(&detected_devices_mutex);
9864 if (test_bit(Faulty, &rdev->flags))
9867 set_bit(AutoDetected, &rdev->flags);
9868 list_add(&rdev->same_set, &pending_raid_disks);
9871 mutex_unlock(&detected_devices_mutex);
9873 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9875 autorun_devices(part);
9878 #endif /* !MODULE */
9880 static __exit void md_exit(void)
9882 struct mddev *mddev;
9883 struct list_head *tmp;
9886 unregister_blkdev(MD_MAJOR,"md");
9887 unregister_blkdev(mdp_major, "mdp");
9888 unregister_reboot_notifier(&md_notifier);
9889 unregister_sysctl_table(raid_table_header);
9891 /* We cannot unload the modules while some process is
9892 * waiting for us in select() or poll() - wake them up
9895 while (waitqueue_active(&md_event_waiters)) {
9896 /* not safe to leave yet */
9897 wake_up(&md_event_waiters);
9901 remove_proc_entry("mdstat", NULL);
9903 for_each_mddev(mddev, tmp) {
9904 export_array(mddev);
9906 mddev->hold_active = 0;
9908 * for_each_mddev() will call mddev_put() at the end of each
9909 * iteration. As the mddev is now fully clear, this will
9910 * schedule the mddev for destruction by a workqueue, and the
9911 * destroy_workqueue() below will wait for that to complete.
9914 destroy_workqueue(md_rdev_misc_wq);
9915 destroy_workqueue(md_misc_wq);
9916 destroy_workqueue(md_wq);
9919 subsys_initcall(md_init);
9920 module_exit(md_exit)
9922 static int get_ro(char *buffer, const struct kernel_param *kp)
9924 return sprintf(buffer, "%d\n", start_readonly);
9926 static int set_ro(const char *val, const struct kernel_param *kp)
9928 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9931 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9932 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9933 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9934 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9936 MODULE_LICENSE("GPL");
9937 MODULE_DESCRIPTION("MD RAID framework");
9939 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);