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 char b[BDEVNAME_SIZE];
1026 if (rdev->sb_loaded)
1029 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1031 rdev->sb_loaded = 1;
1035 pr_err("md: disabled device %s, could not read superblock.\n",
1036 bdevname(rdev->bdev,b));
1040 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1042 return sb1->set_uuid0 == sb2->set_uuid0 &&
1043 sb1->set_uuid1 == sb2->set_uuid1 &&
1044 sb1->set_uuid2 == sb2->set_uuid2 &&
1045 sb1->set_uuid3 == sb2->set_uuid3;
1048 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1051 mdp_super_t *tmp1, *tmp2;
1053 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1054 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1056 if (!tmp1 || !tmp2) {
1065 * nr_disks is not constant
1070 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1077 static u32 md_csum_fold(u32 csum)
1079 csum = (csum & 0xffff) + (csum >> 16);
1080 return (csum & 0xffff) + (csum >> 16);
1083 static unsigned int calc_sb_csum(mdp_super_t *sb)
1086 u32 *sb32 = (u32*)sb;
1088 unsigned int disk_csum, csum;
1090 disk_csum = sb->sb_csum;
1093 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1095 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1098 /* This used to use csum_partial, which was wrong for several
1099 * reasons including that different results are returned on
1100 * different architectures. It isn't critical that we get exactly
1101 * the same return value as before (we always csum_fold before
1102 * testing, and that removes any differences). However as we
1103 * know that csum_partial always returned a 16bit value on
1104 * alphas, do a fold to maximise conformity to previous behaviour.
1106 sb->sb_csum = md_csum_fold(disk_csum);
1108 sb->sb_csum = disk_csum;
1114 * Handle superblock details.
1115 * We want to be able to handle multiple superblock formats
1116 * so we have a common interface to them all, and an array of
1117 * different handlers.
1118 * We rely on user-space to write the initial superblock, and support
1119 * reading and updating of superblocks.
1120 * Interface methods are:
1121 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1122 * loads and validates a superblock on dev.
1123 * if refdev != NULL, compare superblocks on both devices
1125 * 0 - dev has a superblock that is compatible with refdev
1126 * 1 - dev has a superblock that is compatible and newer than refdev
1127 * so dev should be used as the refdev in future
1128 * -EINVAL superblock incompatible or invalid
1129 * -othererror e.g. -EIO
1131 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1132 * Verify that dev is acceptable into mddev.
1133 * The first time, mddev->raid_disks will be 0, and data from
1134 * dev should be merged in. Subsequent calls check that dev
1135 * is new enough. Return 0 or -EINVAL
1137 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1138 * Update the superblock for rdev with data in mddev
1139 * This does not write to disc.
1145 struct module *owner;
1146 int (*load_super)(struct md_rdev *rdev,
1147 struct md_rdev *refdev,
1149 int (*validate_super)(struct mddev *mddev,
1150 struct md_rdev *rdev);
1151 void (*sync_super)(struct mddev *mddev,
1152 struct md_rdev *rdev);
1153 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1154 sector_t num_sectors);
1155 int (*allow_new_offset)(struct md_rdev *rdev,
1156 unsigned long long new_offset);
1160 * Check that the given mddev has no bitmap.
1162 * This function is called from the run method of all personalities that do not
1163 * support bitmaps. It prints an error message and returns non-zero if mddev
1164 * has a bitmap. Otherwise, it returns 0.
1167 int md_check_no_bitmap(struct mddev *mddev)
1169 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1171 pr_warn("%s: bitmaps are not supported for %s\n",
1172 mdname(mddev), mddev->pers->name);
1175 EXPORT_SYMBOL(md_check_no_bitmap);
1178 * load_super for 0.90.0
1180 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1182 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1185 bool spare_disk = true;
1188 * Calculate the position of the superblock (512byte sectors),
1189 * it's at the end of the disk.
1191 * It also happens to be a multiple of 4Kb.
1193 rdev->sb_start = calc_dev_sboffset(rdev);
1195 ret = read_disk_sb(rdev, MD_SB_BYTES);
1201 bdevname(rdev->bdev, b);
1202 sb = page_address(rdev->sb_page);
1204 if (sb->md_magic != MD_SB_MAGIC) {
1205 pr_warn("md: invalid raid superblock magic on %s\n", b);
1209 if (sb->major_version != 0 ||
1210 sb->minor_version < 90 ||
1211 sb->minor_version > 91) {
1212 pr_warn("Bad version number %d.%d on %s\n",
1213 sb->major_version, sb->minor_version, b);
1217 if (sb->raid_disks <= 0)
1220 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1221 pr_warn("md: invalid superblock checksum on %s\n", b);
1225 rdev->preferred_minor = sb->md_minor;
1226 rdev->data_offset = 0;
1227 rdev->new_data_offset = 0;
1228 rdev->sb_size = MD_SB_BYTES;
1229 rdev->badblocks.shift = -1;
1231 if (sb->level == LEVEL_MULTIPATH)
1234 rdev->desc_nr = sb->this_disk.number;
1236 /* not spare disk, or LEVEL_MULTIPATH */
1237 if (sb->level == LEVEL_MULTIPATH ||
1238 (rdev->desc_nr >= 0 &&
1239 rdev->desc_nr < MD_SB_DISKS &&
1240 sb->disks[rdev->desc_nr].state &
1241 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1251 mdp_super_t *refsb = page_address(refdev->sb_page);
1252 if (!md_uuid_equal(refsb, sb)) {
1253 pr_warn("md: %s has different UUID to %s\n",
1254 b, bdevname(refdev->bdev,b2));
1257 if (!md_sb_equal(refsb, sb)) {
1258 pr_warn("md: %s has same UUID but different superblock to %s\n",
1259 b, bdevname(refdev->bdev, b2));
1263 ev2 = md_event(refsb);
1265 if (!spare_disk && ev1 > ev2)
1270 rdev->sectors = rdev->sb_start;
1271 /* Limit to 4TB as metadata cannot record more than that.
1272 * (not needed for Linear and RAID0 as metadata doesn't
1275 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1276 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1278 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1279 /* "this cannot possibly happen" ... */
1287 * validate_super for 0.90.0
1289 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1292 mdp_super_t *sb = page_address(rdev->sb_page);
1293 __u64 ev1 = md_event(sb);
1295 rdev->raid_disk = -1;
1296 clear_bit(Faulty, &rdev->flags);
1297 clear_bit(In_sync, &rdev->flags);
1298 clear_bit(Bitmap_sync, &rdev->flags);
1299 clear_bit(WriteMostly, &rdev->flags);
1301 if (mddev->raid_disks == 0) {
1302 mddev->major_version = 0;
1303 mddev->minor_version = sb->minor_version;
1304 mddev->patch_version = sb->patch_version;
1305 mddev->external = 0;
1306 mddev->chunk_sectors = sb->chunk_size >> 9;
1307 mddev->ctime = sb->ctime;
1308 mddev->utime = sb->utime;
1309 mddev->level = sb->level;
1310 mddev->clevel[0] = 0;
1311 mddev->layout = sb->layout;
1312 mddev->raid_disks = sb->raid_disks;
1313 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1314 mddev->events = ev1;
1315 mddev->bitmap_info.offset = 0;
1316 mddev->bitmap_info.space = 0;
1317 /* bitmap can use 60 K after the 4K superblocks */
1318 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1319 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1320 mddev->reshape_backwards = 0;
1322 if (mddev->minor_version >= 91) {
1323 mddev->reshape_position = sb->reshape_position;
1324 mddev->delta_disks = sb->delta_disks;
1325 mddev->new_level = sb->new_level;
1326 mddev->new_layout = sb->new_layout;
1327 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1328 if (mddev->delta_disks < 0)
1329 mddev->reshape_backwards = 1;
1331 mddev->reshape_position = MaxSector;
1332 mddev->delta_disks = 0;
1333 mddev->new_level = mddev->level;
1334 mddev->new_layout = mddev->layout;
1335 mddev->new_chunk_sectors = mddev->chunk_sectors;
1337 if (mddev->level == 0)
1340 if (sb->state & (1<<MD_SB_CLEAN))
1341 mddev->recovery_cp = MaxSector;
1343 if (sb->events_hi == sb->cp_events_hi &&
1344 sb->events_lo == sb->cp_events_lo) {
1345 mddev->recovery_cp = sb->recovery_cp;
1347 mddev->recovery_cp = 0;
1350 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1351 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1352 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1353 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1355 mddev->max_disks = MD_SB_DISKS;
1357 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1358 mddev->bitmap_info.file == NULL) {
1359 mddev->bitmap_info.offset =
1360 mddev->bitmap_info.default_offset;
1361 mddev->bitmap_info.space =
1362 mddev->bitmap_info.default_space;
1365 } else if (mddev->pers == NULL) {
1366 /* Insist on good event counter while assembling, except
1367 * for spares (which don't need an event count) */
1369 if (sb->disks[rdev->desc_nr].state & (
1370 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1371 if (ev1 < mddev->events)
1373 } else if (mddev->bitmap) {
1374 /* if adding to array with a bitmap, then we can accept an
1375 * older device ... but not too old.
1377 if (ev1 < mddev->bitmap->events_cleared)
1379 if (ev1 < mddev->events)
1380 set_bit(Bitmap_sync, &rdev->flags);
1382 if (ev1 < mddev->events)
1383 /* just a hot-add of a new device, leave raid_disk at -1 */
1387 if (mddev->level != LEVEL_MULTIPATH) {
1388 desc = sb->disks + rdev->desc_nr;
1390 if (desc->state & (1<<MD_DISK_FAULTY))
1391 set_bit(Faulty, &rdev->flags);
1392 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1393 desc->raid_disk < mddev->raid_disks */) {
1394 set_bit(In_sync, &rdev->flags);
1395 rdev->raid_disk = desc->raid_disk;
1396 rdev->saved_raid_disk = desc->raid_disk;
1397 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1398 /* active but not in sync implies recovery up to
1399 * reshape position. We don't know exactly where
1400 * that is, so set to zero for now */
1401 if (mddev->minor_version >= 91) {
1402 rdev->recovery_offset = 0;
1403 rdev->raid_disk = desc->raid_disk;
1406 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1407 set_bit(WriteMostly, &rdev->flags);
1408 if (desc->state & (1<<MD_DISK_FAILFAST))
1409 set_bit(FailFast, &rdev->flags);
1410 } else /* MULTIPATH are always insync */
1411 set_bit(In_sync, &rdev->flags);
1416 * sync_super for 0.90.0
1418 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1421 struct md_rdev *rdev2;
1422 int next_spare = mddev->raid_disks;
1424 /* make rdev->sb match mddev data..
1427 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1428 * 3/ any empty disks < next_spare become removed
1430 * disks[0] gets initialised to REMOVED because
1431 * we cannot be sure from other fields if it has
1432 * been initialised or not.
1435 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1437 rdev->sb_size = MD_SB_BYTES;
1439 sb = page_address(rdev->sb_page);
1441 memset(sb, 0, sizeof(*sb));
1443 sb->md_magic = MD_SB_MAGIC;
1444 sb->major_version = mddev->major_version;
1445 sb->patch_version = mddev->patch_version;
1446 sb->gvalid_words = 0; /* ignored */
1447 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1448 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1449 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1450 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1452 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1453 sb->level = mddev->level;
1454 sb->size = mddev->dev_sectors / 2;
1455 sb->raid_disks = mddev->raid_disks;
1456 sb->md_minor = mddev->md_minor;
1457 sb->not_persistent = 0;
1458 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1460 sb->events_hi = (mddev->events>>32);
1461 sb->events_lo = (u32)mddev->events;
1463 if (mddev->reshape_position == MaxSector)
1464 sb->minor_version = 90;
1466 sb->minor_version = 91;
1467 sb->reshape_position = mddev->reshape_position;
1468 sb->new_level = mddev->new_level;
1469 sb->delta_disks = mddev->delta_disks;
1470 sb->new_layout = mddev->new_layout;
1471 sb->new_chunk = mddev->new_chunk_sectors << 9;
1473 mddev->minor_version = sb->minor_version;
1476 sb->recovery_cp = mddev->recovery_cp;
1477 sb->cp_events_hi = (mddev->events>>32);
1478 sb->cp_events_lo = (u32)mddev->events;
1479 if (mddev->recovery_cp == MaxSector)
1480 sb->state = (1<< MD_SB_CLEAN);
1482 sb->recovery_cp = 0;
1484 sb->layout = mddev->layout;
1485 sb->chunk_size = mddev->chunk_sectors << 9;
1487 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1488 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1490 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1491 rdev_for_each(rdev2, mddev) {
1494 int is_active = test_bit(In_sync, &rdev2->flags);
1496 if (rdev2->raid_disk >= 0 &&
1497 sb->minor_version >= 91)
1498 /* we have nowhere to store the recovery_offset,
1499 * but if it is not below the reshape_position,
1500 * we can piggy-back on that.
1503 if (rdev2->raid_disk < 0 ||
1504 test_bit(Faulty, &rdev2->flags))
1507 desc_nr = rdev2->raid_disk;
1509 desc_nr = next_spare++;
1510 rdev2->desc_nr = desc_nr;
1511 d = &sb->disks[rdev2->desc_nr];
1513 d->number = rdev2->desc_nr;
1514 d->major = MAJOR(rdev2->bdev->bd_dev);
1515 d->minor = MINOR(rdev2->bdev->bd_dev);
1517 d->raid_disk = rdev2->raid_disk;
1519 d->raid_disk = rdev2->desc_nr; /* compatibility */
1520 if (test_bit(Faulty, &rdev2->flags))
1521 d->state = (1<<MD_DISK_FAULTY);
1522 else if (is_active) {
1523 d->state = (1<<MD_DISK_ACTIVE);
1524 if (test_bit(In_sync, &rdev2->flags))
1525 d->state |= (1<<MD_DISK_SYNC);
1533 if (test_bit(WriteMostly, &rdev2->flags))
1534 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1535 if (test_bit(FailFast, &rdev2->flags))
1536 d->state |= (1<<MD_DISK_FAILFAST);
1538 /* now set the "removed" and "faulty" bits on any missing devices */
1539 for (i=0 ; i < mddev->raid_disks ; i++) {
1540 mdp_disk_t *d = &sb->disks[i];
1541 if (d->state == 0 && d->number == 0) {
1544 d->state = (1<<MD_DISK_REMOVED);
1545 d->state |= (1<<MD_DISK_FAULTY);
1549 sb->nr_disks = nr_disks;
1550 sb->active_disks = active;
1551 sb->working_disks = working;
1552 sb->failed_disks = failed;
1553 sb->spare_disks = spare;
1555 sb->this_disk = sb->disks[rdev->desc_nr];
1556 sb->sb_csum = calc_sb_csum(sb);
1560 * rdev_size_change for 0.90.0
1562 static unsigned long long
1563 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1565 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1566 return 0; /* component must fit device */
1567 if (rdev->mddev->bitmap_info.offset)
1568 return 0; /* can't move bitmap */
1569 rdev->sb_start = calc_dev_sboffset(rdev);
1570 if (!num_sectors || num_sectors > rdev->sb_start)
1571 num_sectors = rdev->sb_start;
1572 /* Limit to 4TB as metadata cannot record more than that.
1573 * 4TB == 2^32 KB, or 2*2^32 sectors.
1575 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1576 num_sectors = (sector_t)(2ULL << 32) - 2;
1578 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1580 } while (md_super_wait(rdev->mddev) < 0);
1585 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1587 /* non-zero offset changes not possible with v0.90 */
1588 return new_offset == 0;
1592 * version 1 superblock
1595 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1599 unsigned long long newcsum;
1600 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1601 __le32 *isuper = (__le32*)sb;
1603 disk_csum = sb->sb_csum;
1606 for (; size >= 4; size -= 4)
1607 newcsum += le32_to_cpu(*isuper++);
1610 newcsum += le16_to_cpu(*(__le16*) isuper);
1612 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1613 sb->sb_csum = disk_csum;
1614 return cpu_to_le32(csum);
1617 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1619 struct mdp_superblock_1 *sb;
1623 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1625 bool spare_disk = true;
1628 * Calculate the position of the superblock in 512byte sectors.
1629 * It is always aligned to a 4K boundary and
1630 * depeding on minor_version, it can be:
1631 * 0: At least 8K, but less than 12K, from end of device
1632 * 1: At start of device
1633 * 2: 4K from start of device.
1635 switch(minor_version) {
1637 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1638 sb_start &= ~(sector_t)(4*2-1);
1649 rdev->sb_start = sb_start;
1651 /* superblock is rarely larger than 1K, but it can be larger,
1652 * and it is safe to read 4k, so we do that
1654 ret = read_disk_sb(rdev, 4096);
1655 if (ret) return ret;
1657 sb = page_address(rdev->sb_page);
1659 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1660 sb->major_version != cpu_to_le32(1) ||
1661 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1662 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1663 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1666 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1667 pr_warn("md: invalid superblock checksum on %s\n",
1668 bdevname(rdev->bdev,b));
1671 if (le64_to_cpu(sb->data_size) < 10) {
1672 pr_warn("md: data_size too small on %s\n",
1673 bdevname(rdev->bdev,b));
1678 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1679 /* Some padding is non-zero, might be a new feature */
1682 rdev->preferred_minor = 0xffff;
1683 rdev->data_offset = le64_to_cpu(sb->data_offset);
1684 rdev->new_data_offset = rdev->data_offset;
1685 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1686 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1687 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1688 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1690 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1691 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1692 if (rdev->sb_size & bmask)
1693 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1696 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1699 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1702 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1705 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1707 if (!rdev->bb_page) {
1708 rdev->bb_page = alloc_page(GFP_KERNEL);
1712 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1713 rdev->badblocks.count == 0) {
1714 /* need to load the bad block list.
1715 * Currently we limit it to one page.
1721 int sectors = le16_to_cpu(sb->bblog_size);
1722 if (sectors > (PAGE_SIZE / 512))
1724 offset = le32_to_cpu(sb->bblog_offset);
1727 bb_sector = (long long)offset;
1728 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1729 rdev->bb_page, REQ_OP_READ, 0, true))
1731 bbp = (__le64 *)page_address(rdev->bb_page);
1732 rdev->badblocks.shift = sb->bblog_shift;
1733 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1734 u64 bb = le64_to_cpu(*bbp);
1735 int count = bb & (0x3ff);
1736 u64 sector = bb >> 10;
1737 sector <<= sb->bblog_shift;
1738 count <<= sb->bblog_shift;
1741 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1744 } else if (sb->bblog_offset != 0)
1745 rdev->badblocks.shift = 0;
1747 if ((le32_to_cpu(sb->feature_map) &
1748 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1749 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1750 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1751 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1754 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1758 /* not spare disk, or LEVEL_MULTIPATH */
1759 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1760 (rdev->desc_nr >= 0 &&
1761 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1762 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1763 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1773 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1775 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1776 sb->level != refsb->level ||
1777 sb->layout != refsb->layout ||
1778 sb->chunksize != refsb->chunksize) {
1779 pr_warn("md: %s has strangely different superblock to %s\n",
1780 bdevname(rdev->bdev,b),
1781 bdevname(refdev->bdev,b2));
1784 ev1 = le64_to_cpu(sb->events);
1785 ev2 = le64_to_cpu(refsb->events);
1787 if (!spare_disk && ev1 > ev2)
1793 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1795 sectors = rdev->sb_start;
1796 if (sectors < le64_to_cpu(sb->data_size))
1798 rdev->sectors = le64_to_cpu(sb->data_size);
1802 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1804 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1805 __u64 ev1 = le64_to_cpu(sb->events);
1807 rdev->raid_disk = -1;
1808 clear_bit(Faulty, &rdev->flags);
1809 clear_bit(In_sync, &rdev->flags);
1810 clear_bit(Bitmap_sync, &rdev->flags);
1811 clear_bit(WriteMostly, &rdev->flags);
1813 if (mddev->raid_disks == 0) {
1814 mddev->major_version = 1;
1815 mddev->patch_version = 0;
1816 mddev->external = 0;
1817 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1818 mddev->ctime = le64_to_cpu(sb->ctime);
1819 mddev->utime = le64_to_cpu(sb->utime);
1820 mddev->level = le32_to_cpu(sb->level);
1821 mddev->clevel[0] = 0;
1822 mddev->layout = le32_to_cpu(sb->layout);
1823 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1824 mddev->dev_sectors = le64_to_cpu(sb->size);
1825 mddev->events = ev1;
1826 mddev->bitmap_info.offset = 0;
1827 mddev->bitmap_info.space = 0;
1828 /* Default location for bitmap is 1K after superblock
1829 * using 3K - total of 4K
1831 mddev->bitmap_info.default_offset = 1024 >> 9;
1832 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1833 mddev->reshape_backwards = 0;
1835 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1836 memcpy(mddev->uuid, sb->set_uuid, 16);
1838 mddev->max_disks = (4096-256)/2;
1840 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1841 mddev->bitmap_info.file == NULL) {
1842 mddev->bitmap_info.offset =
1843 (__s32)le32_to_cpu(sb->bitmap_offset);
1844 /* Metadata doesn't record how much space is available.
1845 * For 1.0, we assume we can use up to the superblock
1846 * if before, else to 4K beyond superblock.
1847 * For others, assume no change is possible.
1849 if (mddev->minor_version > 0)
1850 mddev->bitmap_info.space = 0;
1851 else if (mddev->bitmap_info.offset > 0)
1852 mddev->bitmap_info.space =
1853 8 - mddev->bitmap_info.offset;
1855 mddev->bitmap_info.space =
1856 -mddev->bitmap_info.offset;
1859 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1860 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1861 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1862 mddev->new_level = le32_to_cpu(sb->new_level);
1863 mddev->new_layout = le32_to_cpu(sb->new_layout);
1864 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1865 if (mddev->delta_disks < 0 ||
1866 (mddev->delta_disks == 0 &&
1867 (le32_to_cpu(sb->feature_map)
1868 & MD_FEATURE_RESHAPE_BACKWARDS)))
1869 mddev->reshape_backwards = 1;
1871 mddev->reshape_position = MaxSector;
1872 mddev->delta_disks = 0;
1873 mddev->new_level = mddev->level;
1874 mddev->new_layout = mddev->layout;
1875 mddev->new_chunk_sectors = mddev->chunk_sectors;
1878 if (mddev->level == 0 &&
1879 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1882 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1883 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1885 if (le32_to_cpu(sb->feature_map) &
1886 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1887 if (le32_to_cpu(sb->feature_map) &
1888 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1890 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1891 (le32_to_cpu(sb->feature_map) &
1892 MD_FEATURE_MULTIPLE_PPLS))
1894 set_bit(MD_HAS_PPL, &mddev->flags);
1896 } else if (mddev->pers == NULL) {
1897 /* Insist of good event counter while assembling, except for
1898 * spares (which don't need an event count) */
1900 if (rdev->desc_nr >= 0 &&
1901 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1902 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1903 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1904 if (ev1 < mddev->events)
1906 } else if (mddev->bitmap) {
1907 /* If adding to array with a bitmap, then we can accept an
1908 * older device, but not too old.
1910 if (ev1 < mddev->bitmap->events_cleared)
1912 if (ev1 < mddev->events)
1913 set_bit(Bitmap_sync, &rdev->flags);
1915 if (ev1 < mddev->events)
1916 /* just a hot-add of a new device, leave raid_disk at -1 */
1919 if (mddev->level != LEVEL_MULTIPATH) {
1921 if (rdev->desc_nr < 0 ||
1922 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1923 role = MD_DISK_ROLE_SPARE;
1926 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1928 case MD_DISK_ROLE_SPARE: /* spare */
1930 case MD_DISK_ROLE_FAULTY: /* faulty */
1931 set_bit(Faulty, &rdev->flags);
1933 case MD_DISK_ROLE_JOURNAL: /* journal device */
1934 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1935 /* journal device without journal feature */
1936 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1939 set_bit(Journal, &rdev->flags);
1940 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1941 rdev->raid_disk = 0;
1944 rdev->saved_raid_disk = role;
1945 if ((le32_to_cpu(sb->feature_map) &
1946 MD_FEATURE_RECOVERY_OFFSET)) {
1947 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1948 if (!(le32_to_cpu(sb->feature_map) &
1949 MD_FEATURE_RECOVERY_BITMAP))
1950 rdev->saved_raid_disk = -1;
1953 * If the array is FROZEN, then the device can't
1954 * be in_sync with rest of array.
1956 if (!test_bit(MD_RECOVERY_FROZEN,
1958 set_bit(In_sync, &rdev->flags);
1960 rdev->raid_disk = role;
1963 if (sb->devflags & WriteMostly1)
1964 set_bit(WriteMostly, &rdev->flags);
1965 if (sb->devflags & FailFast1)
1966 set_bit(FailFast, &rdev->flags);
1967 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1968 set_bit(Replacement, &rdev->flags);
1969 } else /* MULTIPATH are always insync */
1970 set_bit(In_sync, &rdev->flags);
1975 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1977 struct mdp_superblock_1 *sb;
1978 struct md_rdev *rdev2;
1980 /* make rdev->sb match mddev and rdev data. */
1982 sb = page_address(rdev->sb_page);
1984 sb->feature_map = 0;
1986 sb->recovery_offset = cpu_to_le64(0);
1987 memset(sb->pad3, 0, sizeof(sb->pad3));
1989 sb->utime = cpu_to_le64((__u64)mddev->utime);
1990 sb->events = cpu_to_le64(mddev->events);
1992 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1993 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1994 sb->resync_offset = cpu_to_le64(MaxSector);
1996 sb->resync_offset = cpu_to_le64(0);
1998 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2000 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2001 sb->size = cpu_to_le64(mddev->dev_sectors);
2002 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2003 sb->level = cpu_to_le32(mddev->level);
2004 sb->layout = cpu_to_le32(mddev->layout);
2005 if (test_bit(FailFast, &rdev->flags))
2006 sb->devflags |= FailFast1;
2008 sb->devflags &= ~FailFast1;
2010 if (test_bit(WriteMostly, &rdev->flags))
2011 sb->devflags |= WriteMostly1;
2013 sb->devflags &= ~WriteMostly1;
2014 sb->data_offset = cpu_to_le64(rdev->data_offset);
2015 sb->data_size = cpu_to_le64(rdev->sectors);
2017 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2018 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2019 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2022 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2023 !test_bit(In_sync, &rdev->flags)) {
2025 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2026 sb->recovery_offset =
2027 cpu_to_le64(rdev->recovery_offset);
2028 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2030 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2032 /* Note: recovery_offset and journal_tail share space */
2033 if (test_bit(Journal, &rdev->flags))
2034 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2035 if (test_bit(Replacement, &rdev->flags))
2037 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2039 if (mddev->reshape_position != MaxSector) {
2040 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2041 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2042 sb->new_layout = cpu_to_le32(mddev->new_layout);
2043 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2044 sb->new_level = cpu_to_le32(mddev->new_level);
2045 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2046 if (mddev->delta_disks == 0 &&
2047 mddev->reshape_backwards)
2049 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2050 if (rdev->new_data_offset != rdev->data_offset) {
2052 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2053 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2054 - rdev->data_offset));
2058 if (mddev_is_clustered(mddev))
2059 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2061 if (rdev->badblocks.count == 0)
2062 /* Nothing to do for bad blocks*/ ;
2063 else if (sb->bblog_offset == 0)
2064 /* Cannot record bad blocks on this device */
2065 md_error(mddev, rdev);
2067 struct badblocks *bb = &rdev->badblocks;
2068 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2070 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2075 seq = read_seqbegin(&bb->lock);
2077 memset(bbp, 0xff, PAGE_SIZE);
2079 for (i = 0 ; i < bb->count ; i++) {
2080 u64 internal_bb = p[i];
2081 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2082 | BB_LEN(internal_bb));
2083 bbp[i] = cpu_to_le64(store_bb);
2086 if (read_seqretry(&bb->lock, seq))
2089 bb->sector = (rdev->sb_start +
2090 (int)le32_to_cpu(sb->bblog_offset));
2091 bb->size = le16_to_cpu(sb->bblog_size);
2096 rdev_for_each(rdev2, mddev)
2097 if (rdev2->desc_nr+1 > max_dev)
2098 max_dev = rdev2->desc_nr+1;
2100 if (max_dev > le32_to_cpu(sb->max_dev)) {
2102 sb->max_dev = cpu_to_le32(max_dev);
2103 rdev->sb_size = max_dev * 2 + 256;
2104 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2105 if (rdev->sb_size & bmask)
2106 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2108 max_dev = le32_to_cpu(sb->max_dev);
2110 for (i=0; i<max_dev;i++)
2111 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2113 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2114 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2116 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2117 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2119 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2121 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2122 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2123 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2126 rdev_for_each(rdev2, mddev) {
2128 if (test_bit(Faulty, &rdev2->flags))
2129 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2130 else if (test_bit(In_sync, &rdev2->flags))
2131 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2132 else if (test_bit(Journal, &rdev2->flags))
2133 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2134 else if (rdev2->raid_disk >= 0)
2135 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2137 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2140 sb->sb_csum = calc_sb_1_csum(sb);
2143 static sector_t super_1_choose_bm_space(sector_t dev_size)
2147 /* if the device is bigger than 8Gig, save 64k for bitmap
2148 * usage, if bigger than 200Gig, save 128k
2150 if (dev_size < 64*2)
2152 else if (dev_size - 64*2 >= 200*1024*1024*2)
2154 else if (dev_size - 4*2 > 8*1024*1024*2)
2161 static unsigned long long
2162 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2164 struct mdp_superblock_1 *sb;
2165 sector_t max_sectors;
2166 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2167 return 0; /* component must fit device */
2168 if (rdev->data_offset != rdev->new_data_offset)
2169 return 0; /* too confusing */
2170 if (rdev->sb_start < rdev->data_offset) {
2171 /* minor versions 1 and 2; superblock before data */
2172 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2173 if (!num_sectors || num_sectors > max_sectors)
2174 num_sectors = max_sectors;
2175 } else if (rdev->mddev->bitmap_info.offset) {
2176 /* minor version 0 with bitmap we can't move */
2179 /* minor version 0; superblock after data */
2180 sector_t sb_start, bm_space;
2181 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2183 /* 8K is for superblock */
2184 sb_start = dev_size - 8*2;
2185 sb_start &= ~(sector_t)(4*2 - 1);
2187 bm_space = super_1_choose_bm_space(dev_size);
2189 /* Space that can be used to store date needs to decrease
2190 * superblock bitmap space and bad block space(4K)
2192 max_sectors = sb_start - bm_space - 4*2;
2194 if (!num_sectors || num_sectors > max_sectors)
2195 num_sectors = max_sectors;
2196 rdev->sb_start = sb_start;
2198 sb = page_address(rdev->sb_page);
2199 sb->data_size = cpu_to_le64(num_sectors);
2200 sb->super_offset = cpu_to_le64(rdev->sb_start);
2201 sb->sb_csum = calc_sb_1_csum(sb);
2203 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2205 } while (md_super_wait(rdev->mddev) < 0);
2211 super_1_allow_new_offset(struct md_rdev *rdev,
2212 unsigned long long new_offset)
2214 /* All necessary checks on new >= old have been done */
2215 struct bitmap *bitmap;
2216 if (new_offset >= rdev->data_offset)
2219 /* with 1.0 metadata, there is no metadata to tread on
2220 * so we can always move back */
2221 if (rdev->mddev->minor_version == 0)
2224 /* otherwise we must be sure not to step on
2225 * any metadata, so stay:
2226 * 36K beyond start of superblock
2227 * beyond end of badblocks
2228 * beyond write-intent bitmap
2230 if (rdev->sb_start + (32+4)*2 > new_offset)
2232 bitmap = rdev->mddev->bitmap;
2233 if (bitmap && !rdev->mddev->bitmap_info.file &&
2234 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2235 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2237 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2243 static struct super_type super_types[] = {
2246 .owner = THIS_MODULE,
2247 .load_super = super_90_load,
2248 .validate_super = super_90_validate,
2249 .sync_super = super_90_sync,
2250 .rdev_size_change = super_90_rdev_size_change,
2251 .allow_new_offset = super_90_allow_new_offset,
2255 .owner = THIS_MODULE,
2256 .load_super = super_1_load,
2257 .validate_super = super_1_validate,
2258 .sync_super = super_1_sync,
2259 .rdev_size_change = super_1_rdev_size_change,
2260 .allow_new_offset = super_1_allow_new_offset,
2264 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2266 if (mddev->sync_super) {
2267 mddev->sync_super(mddev, rdev);
2271 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2273 super_types[mddev->major_version].sync_super(mddev, rdev);
2276 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2278 struct md_rdev *rdev, *rdev2;
2281 rdev_for_each_rcu(rdev, mddev1) {
2282 if (test_bit(Faulty, &rdev->flags) ||
2283 test_bit(Journal, &rdev->flags) ||
2284 rdev->raid_disk == -1)
2286 rdev_for_each_rcu(rdev2, mddev2) {
2287 if (test_bit(Faulty, &rdev2->flags) ||
2288 test_bit(Journal, &rdev2->flags) ||
2289 rdev2->raid_disk == -1)
2291 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2301 static LIST_HEAD(pending_raid_disks);
2304 * Try to register data integrity profile for an mddev
2306 * This is called when an array is started and after a disk has been kicked
2307 * from the array. It only succeeds if all working and active component devices
2308 * are integrity capable with matching profiles.
2310 int md_integrity_register(struct mddev *mddev)
2312 struct md_rdev *rdev, *reference = NULL;
2314 if (list_empty(&mddev->disks))
2315 return 0; /* nothing to do */
2316 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2317 return 0; /* shouldn't register, or already is */
2318 rdev_for_each(rdev, mddev) {
2319 /* skip spares and non-functional disks */
2320 if (test_bit(Faulty, &rdev->flags))
2322 if (rdev->raid_disk < 0)
2325 /* Use the first rdev as the reference */
2329 /* does this rdev's profile match the reference profile? */
2330 if (blk_integrity_compare(reference->bdev->bd_disk,
2331 rdev->bdev->bd_disk) < 0)
2334 if (!reference || !bdev_get_integrity(reference->bdev))
2337 * All component devices are integrity capable and have matching
2338 * profiles, register the common profile for the md device.
2340 blk_integrity_register(mddev->gendisk,
2341 bdev_get_integrity(reference->bdev));
2343 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2344 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2345 (mddev->level != 1 && mddev->level != 10 &&
2346 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2348 * No need to handle the failure of bioset_integrity_create,
2349 * because the function is called by md_run() -> pers->run(),
2350 * md_run calls bioset_exit -> bioset_integrity_free in case
2353 pr_err("md: failed to create integrity pool for %s\n",
2359 EXPORT_SYMBOL(md_integrity_register);
2362 * Attempt to add an rdev, but only if it is consistent with the current
2365 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2367 struct blk_integrity *bi_mddev;
2368 char name[BDEVNAME_SIZE];
2370 if (!mddev->gendisk)
2373 bi_mddev = blk_get_integrity(mddev->gendisk);
2375 if (!bi_mddev) /* nothing to do */
2378 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2379 pr_err("%s: incompatible integrity profile for %s\n",
2380 mdname(mddev), bdevname(rdev->bdev, name));
2386 EXPORT_SYMBOL(md_integrity_add_rdev);
2388 static bool rdev_read_only(struct md_rdev *rdev)
2390 return bdev_read_only(rdev->bdev) ||
2391 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2394 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2396 char b[BDEVNAME_SIZE];
2399 /* prevent duplicates */
2400 if (find_rdev(mddev, rdev->bdev->bd_dev))
2403 if (rdev_read_only(rdev) && mddev->pers)
2406 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2407 if (!test_bit(Journal, &rdev->flags) &&
2409 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2411 /* Cannot change size, so fail
2412 * If mddev->level <= 0, then we don't care
2413 * about aligning sizes (e.g. linear)
2415 if (mddev->level > 0)
2418 mddev->dev_sectors = rdev->sectors;
2421 /* Verify rdev->desc_nr is unique.
2422 * If it is -1, assign a free number, else
2423 * check number is not in use
2426 if (rdev->desc_nr < 0) {
2429 choice = mddev->raid_disks;
2430 while (md_find_rdev_nr_rcu(mddev, choice))
2432 rdev->desc_nr = choice;
2434 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2440 if (!test_bit(Journal, &rdev->flags) &&
2441 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2442 pr_warn("md: %s: array is limited to %d devices\n",
2443 mdname(mddev), mddev->max_disks);
2446 bdevname(rdev->bdev,b);
2447 strreplace(b, '/', '!');
2449 rdev->mddev = mddev;
2450 pr_debug("md: bind<%s>\n", b);
2452 if (mddev->raid_disks)
2453 mddev_create_serial_pool(mddev, rdev, false);
2455 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2458 /* failure here is OK */
2459 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2460 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2461 rdev->sysfs_unack_badblocks =
2462 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2463 rdev->sysfs_badblocks =
2464 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2466 list_add_rcu(&rdev->same_set, &mddev->disks);
2467 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2469 /* May as well allow recovery to be retried once */
2470 mddev->recovery_disabled++;
2475 pr_warn("md: failed to register dev-%s for %s\n",
2480 static void rdev_delayed_delete(struct work_struct *ws)
2482 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2483 kobject_del(&rdev->kobj);
2484 kobject_put(&rdev->kobj);
2487 static void unbind_rdev_from_array(struct md_rdev *rdev)
2489 char b[BDEVNAME_SIZE];
2491 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2492 list_del_rcu(&rdev->same_set);
2493 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2494 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2496 sysfs_remove_link(&rdev->kobj, "block");
2497 sysfs_put(rdev->sysfs_state);
2498 sysfs_put(rdev->sysfs_unack_badblocks);
2499 sysfs_put(rdev->sysfs_badblocks);
2500 rdev->sysfs_state = NULL;
2501 rdev->sysfs_unack_badblocks = NULL;
2502 rdev->sysfs_badblocks = NULL;
2503 rdev->badblocks.count = 0;
2504 /* We need to delay this, otherwise we can deadlock when
2505 * writing to 'remove' to "dev/state". We also need
2506 * to delay it due to rcu usage.
2509 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2510 kobject_get(&rdev->kobj);
2511 queue_work(md_rdev_misc_wq, &rdev->del_work);
2515 * prevent the device from being mounted, repartitioned or
2516 * otherwise reused by a RAID array (or any other kernel
2517 * subsystem), by bd_claiming the device.
2519 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2522 struct block_device *bdev;
2524 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2525 shared ? (struct md_rdev *)lock_rdev : rdev);
2527 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2528 MAJOR(dev), MINOR(dev));
2529 return PTR_ERR(bdev);
2535 static void unlock_rdev(struct md_rdev *rdev)
2537 struct block_device *bdev = rdev->bdev;
2539 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2542 void md_autodetect_dev(dev_t dev);
2544 static void export_rdev(struct md_rdev *rdev)
2546 char b[BDEVNAME_SIZE];
2548 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2549 md_rdev_clear(rdev);
2551 if (test_bit(AutoDetected, &rdev->flags))
2552 md_autodetect_dev(rdev->bdev->bd_dev);
2555 kobject_put(&rdev->kobj);
2558 void md_kick_rdev_from_array(struct md_rdev *rdev)
2560 unbind_rdev_from_array(rdev);
2563 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2565 static void export_array(struct mddev *mddev)
2567 struct md_rdev *rdev;
2569 while (!list_empty(&mddev->disks)) {
2570 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2572 md_kick_rdev_from_array(rdev);
2574 mddev->raid_disks = 0;
2575 mddev->major_version = 0;
2578 static bool set_in_sync(struct mddev *mddev)
2580 lockdep_assert_held(&mddev->lock);
2581 if (!mddev->in_sync) {
2582 mddev->sync_checkers++;
2583 spin_unlock(&mddev->lock);
2584 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2585 spin_lock(&mddev->lock);
2586 if (!mddev->in_sync &&
2587 percpu_ref_is_zero(&mddev->writes_pending)) {
2590 * Ensure ->in_sync is visible before we clear
2594 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2595 sysfs_notify_dirent_safe(mddev->sysfs_state);
2597 if (--mddev->sync_checkers == 0)
2598 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2600 if (mddev->safemode == 1)
2601 mddev->safemode = 0;
2602 return mddev->in_sync;
2605 static void sync_sbs(struct mddev *mddev, int nospares)
2607 /* Update each superblock (in-memory image), but
2608 * if we are allowed to, skip spares which already
2609 * have the right event counter, or have one earlier
2610 * (which would mean they aren't being marked as dirty
2611 * with the rest of the array)
2613 struct md_rdev *rdev;
2614 rdev_for_each(rdev, mddev) {
2615 if (rdev->sb_events == mddev->events ||
2617 rdev->raid_disk < 0 &&
2618 rdev->sb_events+1 == mddev->events)) {
2619 /* Don't update this superblock */
2620 rdev->sb_loaded = 2;
2622 sync_super(mddev, rdev);
2623 rdev->sb_loaded = 1;
2628 static bool does_sb_need_changing(struct mddev *mddev)
2630 struct md_rdev *rdev = NULL, *iter;
2631 struct mdp_superblock_1 *sb;
2634 /* Find a good rdev */
2635 rdev_for_each(iter, mddev)
2636 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2641 /* No good device found. */
2645 sb = page_address(rdev->sb_page);
2646 /* Check if a device has become faulty or a spare become active */
2647 rdev_for_each(rdev, mddev) {
2648 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2649 /* Device activated? */
2650 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2651 !test_bit(Faulty, &rdev->flags))
2653 /* Device turned faulty? */
2654 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2658 /* Check if any mddev parameters have changed */
2659 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2660 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2661 (mddev->layout != le32_to_cpu(sb->layout)) ||
2662 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2663 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2669 void md_update_sb(struct mddev *mddev, int force_change)
2671 struct md_rdev *rdev;
2674 int any_badblocks_changed = 0;
2679 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2684 if (mddev_is_clustered(mddev)) {
2685 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2687 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2689 ret = md_cluster_ops->metadata_update_start(mddev);
2690 /* Has someone else has updated the sb */
2691 if (!does_sb_need_changing(mddev)) {
2693 md_cluster_ops->metadata_update_cancel(mddev);
2694 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2695 BIT(MD_SB_CHANGE_DEVS) |
2696 BIT(MD_SB_CHANGE_CLEAN));
2702 * First make sure individual recovery_offsets are correct
2703 * curr_resync_completed can only be used during recovery.
2704 * During reshape/resync it might use array-addresses rather
2705 * that device addresses.
2707 rdev_for_each(rdev, mddev) {
2708 if (rdev->raid_disk >= 0 &&
2709 mddev->delta_disks >= 0 &&
2710 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2711 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2712 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2713 !test_bit(Journal, &rdev->flags) &&
2714 !test_bit(In_sync, &rdev->flags) &&
2715 mddev->curr_resync_completed > rdev->recovery_offset)
2716 rdev->recovery_offset = mddev->curr_resync_completed;
2719 if (!mddev->persistent) {
2720 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2721 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2722 if (!mddev->external) {
2723 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2724 rdev_for_each(rdev, mddev) {
2725 if (rdev->badblocks.changed) {
2726 rdev->badblocks.changed = 0;
2727 ack_all_badblocks(&rdev->badblocks);
2728 md_error(mddev, rdev);
2730 clear_bit(Blocked, &rdev->flags);
2731 clear_bit(BlockedBadBlocks, &rdev->flags);
2732 wake_up(&rdev->blocked_wait);
2735 wake_up(&mddev->sb_wait);
2739 spin_lock(&mddev->lock);
2741 mddev->utime = ktime_get_real_seconds();
2743 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2745 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2746 /* just a clean<-> dirty transition, possibly leave spares alone,
2747 * though if events isn't the right even/odd, we will have to do
2753 if (mddev->degraded)
2754 /* If the array is degraded, then skipping spares is both
2755 * dangerous and fairly pointless.
2756 * Dangerous because a device that was removed from the array
2757 * might have a event_count that still looks up-to-date,
2758 * so it can be re-added without a resync.
2759 * Pointless because if there are any spares to skip,
2760 * then a recovery will happen and soon that array won't
2761 * be degraded any more and the spare can go back to sleep then.
2765 sync_req = mddev->in_sync;
2767 /* If this is just a dirty<->clean transition, and the array is clean
2768 * and 'events' is odd, we can roll back to the previous clean state */
2770 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2771 && mddev->can_decrease_events
2772 && mddev->events != 1) {
2774 mddev->can_decrease_events = 0;
2776 /* otherwise we have to go forward and ... */
2778 mddev->can_decrease_events = nospares;
2782 * This 64-bit counter should never wrap.
2783 * Either we are in around ~1 trillion A.C., assuming
2784 * 1 reboot per second, or we have a bug...
2786 WARN_ON(mddev->events == 0);
2788 rdev_for_each(rdev, mddev) {
2789 if (rdev->badblocks.changed)
2790 any_badblocks_changed++;
2791 if (test_bit(Faulty, &rdev->flags))
2792 set_bit(FaultRecorded, &rdev->flags);
2795 sync_sbs(mddev, nospares);
2796 spin_unlock(&mddev->lock);
2798 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2799 mdname(mddev), mddev->in_sync);
2802 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2804 md_bitmap_update_sb(mddev->bitmap);
2805 rdev_for_each(rdev, mddev) {
2806 char b[BDEVNAME_SIZE];
2808 if (rdev->sb_loaded != 1)
2809 continue; /* no noise on spare devices */
2811 if (!test_bit(Faulty, &rdev->flags)) {
2812 md_super_write(mddev,rdev,
2813 rdev->sb_start, rdev->sb_size,
2815 pr_debug("md: (write) %s's sb offset: %llu\n",
2816 bdevname(rdev->bdev, b),
2817 (unsigned long long)rdev->sb_start);
2818 rdev->sb_events = mddev->events;
2819 if (rdev->badblocks.size) {
2820 md_super_write(mddev, rdev,
2821 rdev->badblocks.sector,
2822 rdev->badblocks.size << 9,
2824 rdev->badblocks.size = 0;
2828 pr_debug("md: %s (skipping faulty)\n",
2829 bdevname(rdev->bdev, b));
2831 if (mddev->level == LEVEL_MULTIPATH)
2832 /* only need to write one superblock... */
2835 if (md_super_wait(mddev) < 0)
2837 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2839 if (mddev_is_clustered(mddev) && ret == 0)
2840 md_cluster_ops->metadata_update_finish(mddev);
2842 if (mddev->in_sync != sync_req ||
2843 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2844 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2845 /* have to write it out again */
2847 wake_up(&mddev->sb_wait);
2848 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2849 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2851 rdev_for_each(rdev, mddev) {
2852 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2853 clear_bit(Blocked, &rdev->flags);
2855 if (any_badblocks_changed)
2856 ack_all_badblocks(&rdev->badblocks);
2857 clear_bit(BlockedBadBlocks, &rdev->flags);
2858 wake_up(&rdev->blocked_wait);
2861 EXPORT_SYMBOL(md_update_sb);
2863 static int add_bound_rdev(struct md_rdev *rdev)
2865 struct mddev *mddev = rdev->mddev;
2867 bool add_journal = test_bit(Journal, &rdev->flags);
2869 if (!mddev->pers->hot_remove_disk || add_journal) {
2870 /* If there is hot_add_disk but no hot_remove_disk
2871 * then added disks for geometry changes,
2872 * and should be added immediately.
2874 super_types[mddev->major_version].
2875 validate_super(mddev, rdev);
2877 mddev_suspend(mddev);
2878 err = mddev->pers->hot_add_disk(mddev, rdev);
2880 mddev_resume(mddev);
2882 md_kick_rdev_from_array(rdev);
2886 sysfs_notify_dirent_safe(rdev->sysfs_state);
2888 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2889 if (mddev->degraded)
2890 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2891 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2893 md_wakeup_thread(mddev->thread);
2897 /* words written to sysfs files may, or may not, be \n terminated.
2898 * We want to accept with case. For this we use cmd_match.
2900 static int cmd_match(const char *cmd, const char *str)
2902 /* See if cmd, written into a sysfs file, matches
2903 * str. They must either be the same, or cmd can
2904 * have a trailing newline
2906 while (*cmd && *str && *cmd == *str) {
2917 struct rdev_sysfs_entry {
2918 struct attribute attr;
2919 ssize_t (*show)(struct md_rdev *, char *);
2920 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2924 state_show(struct md_rdev *rdev, char *page)
2928 unsigned long flags = READ_ONCE(rdev->flags);
2930 if (test_bit(Faulty, &flags) ||
2931 (!test_bit(ExternalBbl, &flags) &&
2932 rdev->badblocks.unacked_exist))
2933 len += sprintf(page+len, "faulty%s", sep);
2934 if (test_bit(In_sync, &flags))
2935 len += sprintf(page+len, "in_sync%s", sep);
2936 if (test_bit(Journal, &flags))
2937 len += sprintf(page+len, "journal%s", sep);
2938 if (test_bit(WriteMostly, &flags))
2939 len += sprintf(page+len, "write_mostly%s", sep);
2940 if (test_bit(Blocked, &flags) ||
2941 (rdev->badblocks.unacked_exist
2942 && !test_bit(Faulty, &flags)))
2943 len += sprintf(page+len, "blocked%s", sep);
2944 if (!test_bit(Faulty, &flags) &&
2945 !test_bit(Journal, &flags) &&
2946 !test_bit(In_sync, &flags))
2947 len += sprintf(page+len, "spare%s", sep);
2948 if (test_bit(WriteErrorSeen, &flags))
2949 len += sprintf(page+len, "write_error%s", sep);
2950 if (test_bit(WantReplacement, &flags))
2951 len += sprintf(page+len, "want_replacement%s", sep);
2952 if (test_bit(Replacement, &flags))
2953 len += sprintf(page+len, "replacement%s", sep);
2954 if (test_bit(ExternalBbl, &flags))
2955 len += sprintf(page+len, "external_bbl%s", sep);
2956 if (test_bit(FailFast, &flags))
2957 len += sprintf(page+len, "failfast%s", sep);
2962 return len+sprintf(page+len, "\n");
2966 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2969 * faulty - simulates an error
2970 * remove - disconnects the device
2971 * writemostly - sets write_mostly
2972 * -writemostly - clears write_mostly
2973 * blocked - sets the Blocked flags
2974 * -blocked - clears the Blocked and possibly simulates an error
2975 * insync - sets Insync providing device isn't active
2976 * -insync - clear Insync for a device with a slot assigned,
2977 * so that it gets rebuilt based on bitmap
2978 * write_error - sets WriteErrorSeen
2979 * -write_error - clears WriteErrorSeen
2980 * {,-}failfast - set/clear FailFast
2983 struct mddev *mddev = rdev->mddev;
2985 bool need_update_sb = false;
2987 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2988 md_error(rdev->mddev, rdev);
2990 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
2994 } else if (cmd_match(buf, "remove")) {
2995 if (rdev->mddev->pers) {
2996 clear_bit(Blocked, &rdev->flags);
2997 remove_and_add_spares(rdev->mddev, rdev);
2999 if (rdev->raid_disk >= 0)
3003 if (mddev_is_clustered(mddev))
3004 err = md_cluster_ops->remove_disk(mddev, rdev);
3007 md_kick_rdev_from_array(rdev);
3009 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3010 md_wakeup_thread(mddev->thread);
3015 } else if (cmd_match(buf, "writemostly")) {
3016 set_bit(WriteMostly, &rdev->flags);
3017 mddev_create_serial_pool(rdev->mddev, rdev, false);
3018 need_update_sb = true;
3020 } else if (cmd_match(buf, "-writemostly")) {
3021 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3022 clear_bit(WriteMostly, &rdev->flags);
3023 need_update_sb = true;
3025 } else if (cmd_match(buf, "blocked")) {
3026 set_bit(Blocked, &rdev->flags);
3028 } else if (cmd_match(buf, "-blocked")) {
3029 if (!test_bit(Faulty, &rdev->flags) &&
3030 !test_bit(ExternalBbl, &rdev->flags) &&
3031 rdev->badblocks.unacked_exist) {
3032 /* metadata handler doesn't understand badblocks,
3033 * so we need to fail the device
3035 md_error(rdev->mddev, rdev);
3037 clear_bit(Blocked, &rdev->flags);
3038 clear_bit(BlockedBadBlocks, &rdev->flags);
3039 wake_up(&rdev->blocked_wait);
3040 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3041 md_wakeup_thread(rdev->mddev->thread);
3044 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3045 set_bit(In_sync, &rdev->flags);
3047 } else if (cmd_match(buf, "failfast")) {
3048 set_bit(FailFast, &rdev->flags);
3049 need_update_sb = true;
3051 } else if (cmd_match(buf, "-failfast")) {
3052 clear_bit(FailFast, &rdev->flags);
3053 need_update_sb = true;
3055 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3056 !test_bit(Journal, &rdev->flags)) {
3057 if (rdev->mddev->pers == NULL) {
3058 clear_bit(In_sync, &rdev->flags);
3059 rdev->saved_raid_disk = rdev->raid_disk;
3060 rdev->raid_disk = -1;
3063 } else if (cmd_match(buf, "write_error")) {
3064 set_bit(WriteErrorSeen, &rdev->flags);
3066 } else if (cmd_match(buf, "-write_error")) {
3067 clear_bit(WriteErrorSeen, &rdev->flags);
3069 } else if (cmd_match(buf, "want_replacement")) {
3070 /* Any non-spare device that is not a replacement can
3071 * become want_replacement at any time, but we then need to
3072 * check if recovery is needed.
3074 if (rdev->raid_disk >= 0 &&
3075 !test_bit(Journal, &rdev->flags) &&
3076 !test_bit(Replacement, &rdev->flags))
3077 set_bit(WantReplacement, &rdev->flags);
3078 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3079 md_wakeup_thread(rdev->mddev->thread);
3081 } else if (cmd_match(buf, "-want_replacement")) {
3082 /* Clearing 'want_replacement' is always allowed.
3083 * Once replacements starts it is too late though.
3086 clear_bit(WantReplacement, &rdev->flags);
3087 } else if (cmd_match(buf, "replacement")) {
3088 /* Can only set a device as a replacement when array has not
3089 * yet been started. Once running, replacement is automatic
3090 * from spares, or by assigning 'slot'.
3092 if (rdev->mddev->pers)
3095 set_bit(Replacement, &rdev->flags);
3098 } else if (cmd_match(buf, "-replacement")) {
3099 /* Similarly, can only clear Replacement before start */
3100 if (rdev->mddev->pers)
3103 clear_bit(Replacement, &rdev->flags);
3106 } else if (cmd_match(buf, "re-add")) {
3107 if (!rdev->mddev->pers)
3109 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3110 rdev->saved_raid_disk >= 0) {
3111 /* clear_bit is performed _after_ all the devices
3112 * have their local Faulty bit cleared. If any writes
3113 * happen in the meantime in the local node, they
3114 * will land in the local bitmap, which will be synced
3115 * by this node eventually
3117 if (!mddev_is_clustered(rdev->mddev) ||
3118 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3119 clear_bit(Faulty, &rdev->flags);
3120 err = add_bound_rdev(rdev);
3124 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3125 set_bit(ExternalBbl, &rdev->flags);
3126 rdev->badblocks.shift = 0;
3128 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3129 clear_bit(ExternalBbl, &rdev->flags);
3133 md_update_sb(mddev, 1);
3135 sysfs_notify_dirent_safe(rdev->sysfs_state);
3136 return err ? err : len;
3138 static struct rdev_sysfs_entry rdev_state =
3139 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3142 errors_show(struct md_rdev *rdev, char *page)
3144 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3148 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3153 rv = kstrtouint(buf, 10, &n);
3156 atomic_set(&rdev->corrected_errors, n);
3159 static struct rdev_sysfs_entry rdev_errors =
3160 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3163 slot_show(struct md_rdev *rdev, char *page)
3165 if (test_bit(Journal, &rdev->flags))
3166 return sprintf(page, "journal\n");
3167 else if (rdev->raid_disk < 0)
3168 return sprintf(page, "none\n");
3170 return sprintf(page, "%d\n", rdev->raid_disk);
3174 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3179 if (test_bit(Journal, &rdev->flags))
3181 if (strncmp(buf, "none", 4)==0)
3184 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3188 if (rdev->mddev->pers && slot == -1) {
3189 /* Setting 'slot' on an active array requires also
3190 * updating the 'rd%d' link, and communicating
3191 * with the personality with ->hot_*_disk.
3192 * For now we only support removing
3193 * failed/spare devices. This normally happens automatically,
3194 * but not when the metadata is externally managed.
3196 if (rdev->raid_disk == -1)
3198 /* personality does all needed checks */
3199 if (rdev->mddev->pers->hot_remove_disk == NULL)
3201 clear_bit(Blocked, &rdev->flags);
3202 remove_and_add_spares(rdev->mddev, rdev);
3203 if (rdev->raid_disk >= 0)
3205 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3206 md_wakeup_thread(rdev->mddev->thread);
3207 } else if (rdev->mddev->pers) {
3208 /* Activating a spare .. or possibly reactivating
3209 * if we ever get bitmaps working here.
3213 if (rdev->raid_disk != -1)
3216 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3219 if (rdev->mddev->pers->hot_add_disk == NULL)
3222 if (slot >= rdev->mddev->raid_disks &&
3223 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3226 rdev->raid_disk = slot;
3227 if (test_bit(In_sync, &rdev->flags))
3228 rdev->saved_raid_disk = slot;
3230 rdev->saved_raid_disk = -1;
3231 clear_bit(In_sync, &rdev->flags);
3232 clear_bit(Bitmap_sync, &rdev->flags);
3233 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3235 rdev->raid_disk = -1;
3238 sysfs_notify_dirent_safe(rdev->sysfs_state);
3239 /* failure here is OK */;
3240 sysfs_link_rdev(rdev->mddev, rdev);
3241 /* don't wakeup anyone, leave that to userspace. */
3243 if (slot >= rdev->mddev->raid_disks &&
3244 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3246 rdev->raid_disk = slot;
3247 /* assume it is working */
3248 clear_bit(Faulty, &rdev->flags);
3249 clear_bit(WriteMostly, &rdev->flags);
3250 set_bit(In_sync, &rdev->flags);
3251 sysfs_notify_dirent_safe(rdev->sysfs_state);
3256 static struct rdev_sysfs_entry rdev_slot =
3257 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3260 offset_show(struct md_rdev *rdev, char *page)
3262 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3266 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3268 unsigned long long offset;
3269 if (kstrtoull(buf, 10, &offset) < 0)
3271 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3273 if (rdev->sectors && rdev->mddev->external)
3274 /* Must set offset before size, so overlap checks
3277 rdev->data_offset = offset;
3278 rdev->new_data_offset = offset;
3282 static struct rdev_sysfs_entry rdev_offset =
3283 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3285 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3287 return sprintf(page, "%llu\n",
3288 (unsigned long long)rdev->new_data_offset);
3291 static ssize_t new_offset_store(struct md_rdev *rdev,
3292 const char *buf, size_t len)
3294 unsigned long long new_offset;
3295 struct mddev *mddev = rdev->mddev;
3297 if (kstrtoull(buf, 10, &new_offset) < 0)
3300 if (mddev->sync_thread ||
3301 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3303 if (new_offset == rdev->data_offset)
3304 /* reset is always permitted */
3306 else if (new_offset > rdev->data_offset) {
3307 /* must not push array size beyond rdev_sectors */
3308 if (new_offset - rdev->data_offset
3309 + mddev->dev_sectors > rdev->sectors)
3312 /* Metadata worries about other space details. */
3314 /* decreasing the offset is inconsistent with a backwards
3317 if (new_offset < rdev->data_offset &&
3318 mddev->reshape_backwards)
3320 /* Increasing offset is inconsistent with forwards
3321 * reshape. reshape_direction should be set to
3322 * 'backwards' first.
3324 if (new_offset > rdev->data_offset &&
3325 !mddev->reshape_backwards)
3328 if (mddev->pers && mddev->persistent &&
3329 !super_types[mddev->major_version]
3330 .allow_new_offset(rdev, new_offset))
3332 rdev->new_data_offset = new_offset;
3333 if (new_offset > rdev->data_offset)
3334 mddev->reshape_backwards = 1;
3335 else if (new_offset < rdev->data_offset)
3336 mddev->reshape_backwards = 0;
3340 static struct rdev_sysfs_entry rdev_new_offset =
3341 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3344 rdev_size_show(struct md_rdev *rdev, char *page)
3346 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3349 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3351 /* check if two start/length pairs overlap */
3359 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3361 unsigned long long blocks;
3364 if (kstrtoull(buf, 10, &blocks) < 0)
3367 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3368 return -EINVAL; /* sector conversion overflow */
3371 if (new != blocks * 2)
3372 return -EINVAL; /* unsigned long long to sector_t overflow */
3379 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3381 struct mddev *my_mddev = rdev->mddev;
3382 sector_t oldsectors = rdev->sectors;
3385 if (test_bit(Journal, &rdev->flags))
3387 if (strict_blocks_to_sectors(buf, §ors) < 0)
3389 if (rdev->data_offset != rdev->new_data_offset)
3390 return -EINVAL; /* too confusing */
3391 if (my_mddev->pers && rdev->raid_disk >= 0) {
3392 if (my_mddev->persistent) {
3393 sectors = super_types[my_mddev->major_version].
3394 rdev_size_change(rdev, sectors);
3397 } else if (!sectors)
3398 sectors = bdev_nr_sectors(rdev->bdev) -
3400 if (!my_mddev->pers->resize)
3401 /* Cannot change size for RAID0 or Linear etc */
3404 if (sectors < my_mddev->dev_sectors)
3405 return -EINVAL; /* component must fit device */
3407 rdev->sectors = sectors;
3408 if (sectors > oldsectors && my_mddev->external) {
3409 /* Need to check that all other rdevs with the same
3410 * ->bdev do not overlap. 'rcu' is sufficient to walk
3411 * the rdev lists safely.
3412 * This check does not provide a hard guarantee, it
3413 * just helps avoid dangerous mistakes.
3415 struct mddev *mddev;
3417 struct list_head *tmp;
3420 for_each_mddev(mddev, tmp) {
3421 struct md_rdev *rdev2;
3423 rdev_for_each(rdev2, mddev)
3424 if (rdev->bdev == rdev2->bdev &&
3426 overlaps(rdev->data_offset, rdev->sectors,
3439 /* Someone else could have slipped in a size
3440 * change here, but doing so is just silly.
3441 * We put oldsectors back because we *know* it is
3442 * safe, and trust userspace not to race with
3445 rdev->sectors = oldsectors;
3452 static struct rdev_sysfs_entry rdev_size =
3453 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3455 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3457 unsigned long long recovery_start = rdev->recovery_offset;
3459 if (test_bit(In_sync, &rdev->flags) ||
3460 recovery_start == MaxSector)
3461 return sprintf(page, "none\n");
3463 return sprintf(page, "%llu\n", recovery_start);
3466 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3468 unsigned long long recovery_start;
3470 if (cmd_match(buf, "none"))
3471 recovery_start = MaxSector;
3472 else if (kstrtoull(buf, 10, &recovery_start))
3475 if (rdev->mddev->pers &&
3476 rdev->raid_disk >= 0)
3479 rdev->recovery_offset = recovery_start;
3480 if (recovery_start == MaxSector)
3481 set_bit(In_sync, &rdev->flags);
3483 clear_bit(In_sync, &rdev->flags);
3487 static struct rdev_sysfs_entry rdev_recovery_start =
3488 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3490 /* sysfs access to bad-blocks list.
3491 * We present two files.
3492 * 'bad-blocks' lists sector numbers and lengths of ranges that
3493 * are recorded as bad. The list is truncated to fit within
3494 * the one-page limit of sysfs.
3495 * Writing "sector length" to this file adds an acknowledged
3497 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3498 * been acknowledged. Writing to this file adds bad blocks
3499 * without acknowledging them. This is largely for testing.
3501 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3503 return badblocks_show(&rdev->badblocks, page, 0);
3505 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3507 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3508 /* Maybe that ack was all we needed */
3509 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3510 wake_up(&rdev->blocked_wait);
3513 static struct rdev_sysfs_entry rdev_bad_blocks =
3514 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3516 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3518 return badblocks_show(&rdev->badblocks, page, 1);
3520 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3522 return badblocks_store(&rdev->badblocks, page, len, 1);
3524 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3525 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3528 ppl_sector_show(struct md_rdev *rdev, char *page)
3530 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3534 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3536 unsigned long long sector;
3538 if (kstrtoull(buf, 10, §or) < 0)
3540 if (sector != (sector_t)sector)
3543 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3544 rdev->raid_disk >= 0)
3547 if (rdev->mddev->persistent) {
3548 if (rdev->mddev->major_version == 0)
3550 if ((sector > rdev->sb_start &&
3551 sector - rdev->sb_start > S16_MAX) ||
3552 (sector < rdev->sb_start &&
3553 rdev->sb_start - sector > -S16_MIN))
3555 rdev->ppl.offset = sector - rdev->sb_start;
3556 } else if (!rdev->mddev->external) {
3559 rdev->ppl.sector = sector;
3563 static struct rdev_sysfs_entry rdev_ppl_sector =
3564 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3567 ppl_size_show(struct md_rdev *rdev, char *page)
3569 return sprintf(page, "%u\n", rdev->ppl.size);
3573 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3577 if (kstrtouint(buf, 10, &size) < 0)
3580 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3581 rdev->raid_disk >= 0)
3584 if (rdev->mddev->persistent) {
3585 if (rdev->mddev->major_version == 0)
3589 } else if (!rdev->mddev->external) {
3592 rdev->ppl.size = size;
3596 static struct rdev_sysfs_entry rdev_ppl_size =
3597 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3599 static struct attribute *rdev_default_attrs[] = {
3604 &rdev_new_offset.attr,
3606 &rdev_recovery_start.attr,
3607 &rdev_bad_blocks.attr,
3608 &rdev_unack_bad_blocks.attr,
3609 &rdev_ppl_sector.attr,
3610 &rdev_ppl_size.attr,
3613 ATTRIBUTE_GROUPS(rdev_default);
3615 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3617 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3618 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3624 return entry->show(rdev, page);
3628 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3629 const char *page, size_t length)
3631 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3632 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3634 struct mddev *mddev = rdev->mddev;
3638 if (!capable(CAP_SYS_ADMIN))
3640 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3642 if (rdev->mddev == NULL)
3645 rv = entry->store(rdev, page, length);
3646 mddev_unlock(mddev);
3651 static void rdev_free(struct kobject *ko)
3653 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3656 static const struct sysfs_ops rdev_sysfs_ops = {
3657 .show = rdev_attr_show,
3658 .store = rdev_attr_store,
3660 static struct kobj_type rdev_ktype = {
3661 .release = rdev_free,
3662 .sysfs_ops = &rdev_sysfs_ops,
3663 .default_groups = rdev_default_groups,
3666 int md_rdev_init(struct md_rdev *rdev)
3669 rdev->saved_raid_disk = -1;
3670 rdev->raid_disk = -1;
3672 rdev->data_offset = 0;
3673 rdev->new_data_offset = 0;
3674 rdev->sb_events = 0;
3675 rdev->last_read_error = 0;
3676 rdev->sb_loaded = 0;
3677 rdev->bb_page = NULL;
3678 atomic_set(&rdev->nr_pending, 0);
3679 atomic_set(&rdev->read_errors, 0);
3680 atomic_set(&rdev->corrected_errors, 0);
3682 INIT_LIST_HEAD(&rdev->same_set);
3683 init_waitqueue_head(&rdev->blocked_wait);
3685 /* Add space to store bad block list.
3686 * This reserves the space even on arrays where it cannot
3687 * be used - I wonder if that matters
3689 return badblocks_init(&rdev->badblocks, 0);
3691 EXPORT_SYMBOL_GPL(md_rdev_init);
3693 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3695 * mark the device faulty if:
3697 * - the device is nonexistent (zero size)
3698 * - the device has no valid superblock
3700 * a faulty rdev _never_ has rdev->sb set.
3702 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3704 char b[BDEVNAME_SIZE];
3706 struct md_rdev *rdev;
3709 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3711 return ERR_PTR(-ENOMEM);
3713 err = md_rdev_init(rdev);
3716 err = alloc_disk_sb(rdev);
3720 err = lock_rdev(rdev, newdev, super_format == -2);
3724 kobject_init(&rdev->kobj, &rdev_ktype);
3726 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3728 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3729 bdevname(rdev->bdev,b));
3734 if (super_format >= 0) {
3735 err = super_types[super_format].
3736 load_super(rdev, NULL, super_minor);
3737 if (err == -EINVAL) {
3738 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3739 bdevname(rdev->bdev,b),
3740 super_format, super_minor);
3744 pr_warn("md: could not read %s's sb, not importing!\n",
3745 bdevname(rdev->bdev,b));
3755 md_rdev_clear(rdev);
3757 return ERR_PTR(err);
3761 * Check a full RAID array for plausibility
3764 static int analyze_sbs(struct mddev *mddev)
3767 struct md_rdev *rdev, *freshest, *tmp;
3768 char b[BDEVNAME_SIZE];
3771 rdev_for_each_safe(rdev, tmp, mddev)
3772 switch (super_types[mddev->major_version].
3773 load_super(rdev, freshest, mddev->minor_version)) {
3780 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3781 bdevname(rdev->bdev,b));
3782 md_kick_rdev_from_array(rdev);
3785 /* Cannot find a valid fresh disk */
3787 pr_warn("md: cannot find a valid disk\n");
3791 super_types[mddev->major_version].
3792 validate_super(mddev, freshest);
3795 rdev_for_each_safe(rdev, tmp, mddev) {
3796 if (mddev->max_disks &&
3797 (rdev->desc_nr >= mddev->max_disks ||
3798 i > mddev->max_disks)) {
3799 pr_warn("md: %s: %s: only %d devices permitted\n",
3800 mdname(mddev), bdevname(rdev->bdev, b),
3802 md_kick_rdev_from_array(rdev);
3805 if (rdev != freshest) {
3806 if (super_types[mddev->major_version].
3807 validate_super(mddev, rdev)) {
3808 pr_warn("md: kicking non-fresh %s from array!\n",
3809 bdevname(rdev->bdev,b));
3810 md_kick_rdev_from_array(rdev);
3814 if (mddev->level == LEVEL_MULTIPATH) {
3815 rdev->desc_nr = i++;
3816 rdev->raid_disk = rdev->desc_nr;
3817 set_bit(In_sync, &rdev->flags);
3818 } else if (rdev->raid_disk >=
3819 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3820 !test_bit(Journal, &rdev->flags)) {
3821 rdev->raid_disk = -1;
3822 clear_bit(In_sync, &rdev->flags);
3829 /* Read a fixed-point number.
3830 * Numbers in sysfs attributes should be in "standard" units where
3831 * possible, so time should be in seconds.
3832 * However we internally use a a much smaller unit such as
3833 * milliseconds or jiffies.
3834 * This function takes a decimal number with a possible fractional
3835 * component, and produces an integer which is the result of
3836 * multiplying that number by 10^'scale'.
3837 * all without any floating-point arithmetic.
3839 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3841 unsigned long result = 0;
3843 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3846 else if (decimals < scale) {
3849 result = result * 10 + value;
3861 *res = result * int_pow(10, scale - decimals);
3866 safe_delay_show(struct mddev *mddev, char *page)
3868 int msec = (mddev->safemode_delay*1000)/HZ;
3869 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3872 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3876 if (mddev_is_clustered(mddev)) {
3877 pr_warn("md: Safemode is disabled for clustered mode\n");
3881 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3884 mddev->safemode_delay = 0;
3886 unsigned long old_delay = mddev->safemode_delay;
3887 unsigned long new_delay = (msec*HZ)/1000;
3891 mddev->safemode_delay = new_delay;
3892 if (new_delay < old_delay || old_delay == 0)
3893 mod_timer(&mddev->safemode_timer, jiffies+1);
3897 static struct md_sysfs_entry md_safe_delay =
3898 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3901 level_show(struct mddev *mddev, char *page)
3903 struct md_personality *p;
3905 spin_lock(&mddev->lock);
3908 ret = sprintf(page, "%s\n", p->name);
3909 else if (mddev->clevel[0])
3910 ret = sprintf(page, "%s\n", mddev->clevel);
3911 else if (mddev->level != LEVEL_NONE)
3912 ret = sprintf(page, "%d\n", mddev->level);
3915 spin_unlock(&mddev->lock);
3920 level_store(struct mddev *mddev, const char *buf, size_t len)
3925 struct md_personality *pers, *oldpers;
3927 void *priv, *oldpriv;
3928 struct md_rdev *rdev;
3930 if (slen == 0 || slen >= sizeof(clevel))
3933 rv = mddev_lock(mddev);
3937 if (mddev->pers == NULL) {
3938 strncpy(mddev->clevel, buf, slen);
3939 if (mddev->clevel[slen-1] == '\n')
3941 mddev->clevel[slen] = 0;
3942 mddev->level = LEVEL_NONE;
3950 /* request to change the personality. Need to ensure:
3951 * - array is not engaged in resync/recovery/reshape
3952 * - old personality can be suspended
3953 * - new personality will access other array.
3957 if (mddev->sync_thread ||
3958 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3959 mddev->reshape_position != MaxSector ||
3960 mddev->sysfs_active)
3964 if (!mddev->pers->quiesce) {
3965 pr_warn("md: %s: %s does not support online personality change\n",
3966 mdname(mddev), mddev->pers->name);
3970 /* Now find the new personality */
3971 strncpy(clevel, buf, slen);
3972 if (clevel[slen-1] == '\n')
3975 if (kstrtol(clevel, 10, &level))
3978 if (request_module("md-%s", clevel) != 0)
3979 request_module("md-level-%s", clevel);
3980 spin_lock(&pers_lock);
3981 pers = find_pers(level, clevel);
3982 if (!pers || !try_module_get(pers->owner)) {
3983 spin_unlock(&pers_lock);
3984 pr_warn("md: personality %s not loaded\n", clevel);
3988 spin_unlock(&pers_lock);
3990 if (pers == mddev->pers) {
3991 /* Nothing to do! */
3992 module_put(pers->owner);
3996 if (!pers->takeover) {
3997 module_put(pers->owner);
3998 pr_warn("md: %s: %s does not support personality takeover\n",
3999 mdname(mddev), clevel);
4004 rdev_for_each(rdev, mddev)
4005 rdev->new_raid_disk = rdev->raid_disk;
4007 /* ->takeover must set new_* and/or delta_disks
4008 * if it succeeds, and may set them when it fails.
4010 priv = pers->takeover(mddev);
4012 mddev->new_level = mddev->level;
4013 mddev->new_layout = mddev->layout;
4014 mddev->new_chunk_sectors = mddev->chunk_sectors;
4015 mddev->raid_disks -= mddev->delta_disks;
4016 mddev->delta_disks = 0;
4017 mddev->reshape_backwards = 0;
4018 module_put(pers->owner);
4019 pr_warn("md: %s: %s would not accept array\n",
4020 mdname(mddev), clevel);
4025 /* Looks like we have a winner */
4026 mddev_suspend(mddev);
4027 mddev_detach(mddev);
4029 spin_lock(&mddev->lock);
4030 oldpers = mddev->pers;
4031 oldpriv = mddev->private;
4033 mddev->private = priv;
4034 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4035 mddev->level = mddev->new_level;
4036 mddev->layout = mddev->new_layout;
4037 mddev->chunk_sectors = mddev->new_chunk_sectors;
4038 mddev->delta_disks = 0;
4039 mddev->reshape_backwards = 0;
4040 mddev->degraded = 0;
4041 spin_unlock(&mddev->lock);
4043 if (oldpers->sync_request == NULL &&
4045 /* We are converting from a no-redundancy array
4046 * to a redundancy array and metadata is managed
4047 * externally so we need to be sure that writes
4048 * won't block due to a need to transition
4050 * until external management is started.
4053 mddev->safemode_delay = 0;
4054 mddev->safemode = 0;
4057 oldpers->free(mddev, oldpriv);
4059 if (oldpers->sync_request == NULL &&
4060 pers->sync_request != NULL) {
4061 /* need to add the md_redundancy_group */
4062 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4063 pr_warn("md: cannot register extra attributes for %s\n",
4065 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4066 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4067 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4069 if (oldpers->sync_request != NULL &&
4070 pers->sync_request == NULL) {
4071 /* need to remove the md_redundancy_group */
4072 if (mddev->to_remove == NULL)
4073 mddev->to_remove = &md_redundancy_group;
4076 module_put(oldpers->owner);
4078 rdev_for_each(rdev, mddev) {
4079 if (rdev->raid_disk < 0)
4081 if (rdev->new_raid_disk >= mddev->raid_disks)
4082 rdev->new_raid_disk = -1;
4083 if (rdev->new_raid_disk == rdev->raid_disk)
4085 sysfs_unlink_rdev(mddev, rdev);
4087 rdev_for_each(rdev, mddev) {
4088 if (rdev->raid_disk < 0)
4090 if (rdev->new_raid_disk == rdev->raid_disk)
4092 rdev->raid_disk = rdev->new_raid_disk;
4093 if (rdev->raid_disk < 0)
4094 clear_bit(In_sync, &rdev->flags);
4096 if (sysfs_link_rdev(mddev, rdev))
4097 pr_warn("md: cannot register rd%d for %s after level change\n",
4098 rdev->raid_disk, mdname(mddev));
4102 if (pers->sync_request == NULL) {
4103 /* this is now an array without redundancy, so
4104 * it must always be in_sync
4107 del_timer_sync(&mddev->safemode_timer);
4109 blk_set_stacking_limits(&mddev->queue->limits);
4111 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4112 mddev_resume(mddev);
4114 md_update_sb(mddev, 1);
4115 sysfs_notify_dirent_safe(mddev->sysfs_level);
4119 mddev_unlock(mddev);
4123 static struct md_sysfs_entry md_level =
4124 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4127 layout_show(struct mddev *mddev, char *page)
4129 /* just a number, not meaningful for all levels */
4130 if (mddev->reshape_position != MaxSector &&
4131 mddev->layout != mddev->new_layout)
4132 return sprintf(page, "%d (%d)\n",
4133 mddev->new_layout, mddev->layout);
4134 return sprintf(page, "%d\n", mddev->layout);
4138 layout_store(struct mddev *mddev, const char *buf, size_t len)
4143 err = kstrtouint(buf, 10, &n);
4146 err = mddev_lock(mddev);
4151 if (mddev->pers->check_reshape == NULL)
4156 mddev->new_layout = n;
4157 err = mddev->pers->check_reshape(mddev);
4159 mddev->new_layout = mddev->layout;
4162 mddev->new_layout = n;
4163 if (mddev->reshape_position == MaxSector)
4166 mddev_unlock(mddev);
4169 static struct md_sysfs_entry md_layout =
4170 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4173 raid_disks_show(struct mddev *mddev, char *page)
4175 if (mddev->raid_disks == 0)
4177 if (mddev->reshape_position != MaxSector &&
4178 mddev->delta_disks != 0)
4179 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4180 mddev->raid_disks - mddev->delta_disks);
4181 return sprintf(page, "%d\n", mddev->raid_disks);
4184 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4187 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4192 err = kstrtouint(buf, 10, &n);
4196 err = mddev_lock(mddev);
4200 err = update_raid_disks(mddev, n);
4201 else if (mddev->reshape_position != MaxSector) {
4202 struct md_rdev *rdev;
4203 int olddisks = mddev->raid_disks - mddev->delta_disks;
4206 rdev_for_each(rdev, mddev) {
4208 rdev->data_offset < rdev->new_data_offset)
4211 rdev->data_offset > rdev->new_data_offset)
4215 mddev->delta_disks = n - olddisks;
4216 mddev->raid_disks = n;
4217 mddev->reshape_backwards = (mddev->delta_disks < 0);
4219 mddev->raid_disks = n;
4221 mddev_unlock(mddev);
4222 return err ? err : len;
4224 static struct md_sysfs_entry md_raid_disks =
4225 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4228 uuid_show(struct mddev *mddev, char *page)
4230 return sprintf(page, "%pU\n", mddev->uuid);
4232 static struct md_sysfs_entry md_uuid =
4233 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4236 chunk_size_show(struct mddev *mddev, char *page)
4238 if (mddev->reshape_position != MaxSector &&
4239 mddev->chunk_sectors != mddev->new_chunk_sectors)
4240 return sprintf(page, "%d (%d)\n",
4241 mddev->new_chunk_sectors << 9,
4242 mddev->chunk_sectors << 9);
4243 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4247 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4252 err = kstrtoul(buf, 10, &n);
4256 err = mddev_lock(mddev);
4260 if (mddev->pers->check_reshape == NULL)
4265 mddev->new_chunk_sectors = n >> 9;
4266 err = mddev->pers->check_reshape(mddev);
4268 mddev->new_chunk_sectors = mddev->chunk_sectors;
4271 mddev->new_chunk_sectors = n >> 9;
4272 if (mddev->reshape_position == MaxSector)
4273 mddev->chunk_sectors = n >> 9;
4275 mddev_unlock(mddev);
4278 static struct md_sysfs_entry md_chunk_size =
4279 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4282 resync_start_show(struct mddev *mddev, char *page)
4284 if (mddev->recovery_cp == MaxSector)
4285 return sprintf(page, "none\n");
4286 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4290 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4292 unsigned long long n;
4295 if (cmd_match(buf, "none"))
4298 err = kstrtoull(buf, 10, &n);
4301 if (n != (sector_t)n)
4305 err = mddev_lock(mddev);
4308 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4312 mddev->recovery_cp = n;
4314 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4316 mddev_unlock(mddev);
4319 static struct md_sysfs_entry md_resync_start =
4320 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4321 resync_start_show, resync_start_store);
4324 * The array state can be:
4327 * No devices, no size, no level
4328 * Equivalent to STOP_ARRAY ioctl
4330 * May have some settings, but array is not active
4331 * all IO results in error
4332 * When written, doesn't tear down array, but just stops it
4333 * suspended (not supported yet)
4334 * All IO requests will block. The array can be reconfigured.
4335 * Writing this, if accepted, will block until array is quiescent
4337 * no resync can happen. no superblocks get written.
4338 * write requests fail
4340 * like readonly, but behaves like 'clean' on a write request.
4342 * clean - no pending writes, but otherwise active.
4343 * When written to inactive array, starts without resync
4344 * If a write request arrives then
4345 * if metadata is known, mark 'dirty' and switch to 'active'.
4346 * if not known, block and switch to write-pending
4347 * If written to an active array that has pending writes, then fails.
4349 * fully active: IO and resync can be happening.
4350 * When written to inactive array, starts with resync
4353 * clean, but writes are blocked waiting for 'active' to be written.
4356 * like active, but no writes have been seen for a while (100msec).
4359 * Array is failed. It's useful because mounted-arrays aren't stopped
4360 * when array is failed, so this state will at least alert the user that
4361 * something is wrong.
4363 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4364 write_pending, active_idle, broken, bad_word};
4365 static char *array_states[] = {
4366 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4367 "write-pending", "active-idle", "broken", NULL };
4369 static int match_word(const char *word, char **list)
4372 for (n=0; list[n]; n++)
4373 if (cmd_match(word, list[n]))
4379 array_state_show(struct mddev *mddev, char *page)
4381 enum array_state st = inactive;
4383 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4392 spin_lock(&mddev->lock);
4393 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4395 else if (mddev->in_sync)
4397 else if (mddev->safemode)
4401 spin_unlock(&mddev->lock);
4404 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4407 if (list_empty(&mddev->disks) &&
4408 mddev->raid_disks == 0 &&
4409 mddev->dev_sectors == 0)
4414 return sprintf(page, "%s\n", array_states[st]);
4417 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4418 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4419 static int restart_array(struct mddev *mddev);
4422 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4425 enum array_state st = match_word(buf, array_states);
4427 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4428 /* don't take reconfig_mutex when toggling between
4431 spin_lock(&mddev->lock);
4433 restart_array(mddev);
4434 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4435 md_wakeup_thread(mddev->thread);
4436 wake_up(&mddev->sb_wait);
4437 } else /* st == clean */ {
4438 restart_array(mddev);
4439 if (!set_in_sync(mddev))
4443 sysfs_notify_dirent_safe(mddev->sysfs_state);
4444 spin_unlock(&mddev->lock);
4447 err = mddev_lock(mddev);
4455 /* stopping an active array */
4456 err = do_md_stop(mddev, 0, NULL);
4459 /* stopping an active array */
4461 err = do_md_stop(mddev, 2, NULL);
4463 err = 0; /* already inactive */
4466 break; /* not supported yet */
4469 err = md_set_readonly(mddev, NULL);
4472 set_disk_ro(mddev->gendisk, 1);
4473 err = do_md_run(mddev);
4479 err = md_set_readonly(mddev, NULL);
4480 else if (mddev->ro == 1)
4481 err = restart_array(mddev);
4484 set_disk_ro(mddev->gendisk, 0);
4488 err = do_md_run(mddev);
4493 err = restart_array(mddev);
4496 spin_lock(&mddev->lock);
4497 if (!set_in_sync(mddev))
4499 spin_unlock(&mddev->lock);
4505 err = restart_array(mddev);
4508 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4509 wake_up(&mddev->sb_wait);
4513 set_disk_ro(mddev->gendisk, 0);
4514 err = do_md_run(mddev);
4520 /* these cannot be set */
4525 if (mddev->hold_active == UNTIL_IOCTL)
4526 mddev->hold_active = 0;
4527 sysfs_notify_dirent_safe(mddev->sysfs_state);
4529 mddev_unlock(mddev);
4532 static struct md_sysfs_entry md_array_state =
4533 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4536 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4537 return sprintf(page, "%d\n",
4538 atomic_read(&mddev->max_corr_read_errors));
4542 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4547 rv = kstrtouint(buf, 10, &n);
4550 atomic_set(&mddev->max_corr_read_errors, n);
4554 static struct md_sysfs_entry max_corr_read_errors =
4555 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4556 max_corrected_read_errors_store);
4559 null_show(struct mddev *mddev, char *page)
4564 /* need to ensure rdev_delayed_delete() has completed */
4565 static void flush_rdev_wq(struct mddev *mddev)
4567 struct md_rdev *rdev;
4570 rdev_for_each_rcu(rdev, mddev)
4571 if (work_pending(&rdev->del_work)) {
4572 flush_workqueue(md_rdev_misc_wq);
4579 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4581 /* buf must be %d:%d\n? giving major and minor numbers */
4582 /* The new device is added to the array.
4583 * If the array has a persistent superblock, we read the
4584 * superblock to initialise info and check validity.
4585 * Otherwise, only checking done is that in bind_rdev_to_array,
4586 * which mainly checks size.
4589 int major = simple_strtoul(buf, &e, 10);
4592 struct md_rdev *rdev;
4595 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4597 minor = simple_strtoul(e+1, &e, 10);
4598 if (*e && *e != '\n')
4600 dev = MKDEV(major, minor);
4601 if (major != MAJOR(dev) ||
4602 minor != MINOR(dev))
4605 flush_rdev_wq(mddev);
4606 err = mddev_lock(mddev);
4609 if (mddev->persistent) {
4610 rdev = md_import_device(dev, mddev->major_version,
4611 mddev->minor_version);
4612 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4613 struct md_rdev *rdev0
4614 = list_entry(mddev->disks.next,
4615 struct md_rdev, same_set);
4616 err = super_types[mddev->major_version]
4617 .load_super(rdev, rdev0, mddev->minor_version);
4621 } else if (mddev->external)
4622 rdev = md_import_device(dev, -2, -1);
4624 rdev = md_import_device(dev, -1, -1);
4627 mddev_unlock(mddev);
4628 return PTR_ERR(rdev);
4630 err = bind_rdev_to_array(rdev, mddev);
4634 mddev_unlock(mddev);
4637 return err ? err : len;
4640 static struct md_sysfs_entry md_new_device =
4641 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4644 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4647 unsigned long chunk, end_chunk;
4650 err = mddev_lock(mddev);
4655 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4657 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4658 if (buf == end) break;
4659 if (*end == '-') { /* range */
4661 end_chunk = simple_strtoul(buf, &end, 0);
4662 if (buf == end) break;
4664 if (*end && !isspace(*end)) break;
4665 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4666 buf = skip_spaces(end);
4668 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4670 mddev_unlock(mddev);
4674 static struct md_sysfs_entry md_bitmap =
4675 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4678 size_show(struct mddev *mddev, char *page)
4680 return sprintf(page, "%llu\n",
4681 (unsigned long long)mddev->dev_sectors / 2);
4684 static int update_size(struct mddev *mddev, sector_t num_sectors);
4687 size_store(struct mddev *mddev, const char *buf, size_t len)
4689 /* If array is inactive, we can reduce the component size, but
4690 * not increase it (except from 0).
4691 * If array is active, we can try an on-line resize
4694 int err = strict_blocks_to_sectors(buf, §ors);
4698 err = mddev_lock(mddev);
4702 err = update_size(mddev, sectors);
4704 md_update_sb(mddev, 1);
4706 if (mddev->dev_sectors == 0 ||
4707 mddev->dev_sectors > sectors)
4708 mddev->dev_sectors = sectors;
4712 mddev_unlock(mddev);
4713 return err ? err : len;
4716 static struct md_sysfs_entry md_size =
4717 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4719 /* Metadata version.
4721 * 'none' for arrays with no metadata (good luck...)
4722 * 'external' for arrays with externally managed metadata,
4723 * or N.M for internally known formats
4726 metadata_show(struct mddev *mddev, char *page)
4728 if (mddev->persistent)
4729 return sprintf(page, "%d.%d\n",
4730 mddev->major_version, mddev->minor_version);
4731 else if (mddev->external)
4732 return sprintf(page, "external:%s\n", mddev->metadata_type);
4734 return sprintf(page, "none\n");
4738 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4743 /* Changing the details of 'external' metadata is
4744 * always permitted. Otherwise there must be
4745 * no devices attached to the array.
4748 err = mddev_lock(mddev);
4752 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4754 else if (!list_empty(&mddev->disks))
4758 if (cmd_match(buf, "none")) {
4759 mddev->persistent = 0;
4760 mddev->external = 0;
4761 mddev->major_version = 0;
4762 mddev->minor_version = 90;
4765 if (strncmp(buf, "external:", 9) == 0) {
4766 size_t namelen = len-9;
4767 if (namelen >= sizeof(mddev->metadata_type))
4768 namelen = sizeof(mddev->metadata_type)-1;
4769 strncpy(mddev->metadata_type, buf+9, namelen);
4770 mddev->metadata_type[namelen] = 0;
4771 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4772 mddev->metadata_type[--namelen] = 0;
4773 mddev->persistent = 0;
4774 mddev->external = 1;
4775 mddev->major_version = 0;
4776 mddev->minor_version = 90;
4779 major = simple_strtoul(buf, &e, 10);
4781 if (e==buf || *e != '.')
4784 minor = simple_strtoul(buf, &e, 10);
4785 if (e==buf || (*e && *e != '\n') )
4788 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4790 mddev->major_version = major;
4791 mddev->minor_version = minor;
4792 mddev->persistent = 1;
4793 mddev->external = 0;
4796 mddev_unlock(mddev);
4800 static struct md_sysfs_entry md_metadata =
4801 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4804 action_show(struct mddev *mddev, char *page)
4806 char *type = "idle";
4807 unsigned long recovery = mddev->recovery;
4808 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4810 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4811 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4812 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4814 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4815 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4817 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4821 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4823 else if (mddev->reshape_position != MaxSector)
4826 return sprintf(page, "%s\n", type);
4830 action_store(struct mddev *mddev, const char *page, size_t len)
4832 if (!mddev->pers || !mddev->pers->sync_request)
4836 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4837 if (cmd_match(page, "frozen"))
4838 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4840 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4841 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4842 mddev_lock(mddev) == 0) {
4843 if (work_pending(&mddev->del_work))
4844 flush_workqueue(md_misc_wq);
4845 if (mddev->sync_thread) {
4846 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4847 md_reap_sync_thread(mddev);
4849 mddev_unlock(mddev);
4851 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4853 else if (cmd_match(page, "resync"))
4854 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4855 else if (cmd_match(page, "recover")) {
4856 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4857 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4858 } else if (cmd_match(page, "reshape")) {
4860 if (mddev->pers->start_reshape == NULL)
4862 err = mddev_lock(mddev);
4864 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4867 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4868 err = mddev->pers->start_reshape(mddev);
4870 mddev_unlock(mddev);
4874 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4876 if (cmd_match(page, "check"))
4877 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4878 else if (!cmd_match(page, "repair"))
4880 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4881 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4882 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4884 if (mddev->ro == 2) {
4885 /* A write to sync_action is enough to justify
4886 * canceling read-auto mode
4889 md_wakeup_thread(mddev->sync_thread);
4891 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4892 md_wakeup_thread(mddev->thread);
4893 sysfs_notify_dirent_safe(mddev->sysfs_action);
4897 static struct md_sysfs_entry md_scan_mode =
4898 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4901 last_sync_action_show(struct mddev *mddev, char *page)
4903 return sprintf(page, "%s\n", mddev->last_sync_action);
4906 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4909 mismatch_cnt_show(struct mddev *mddev, char *page)
4911 return sprintf(page, "%llu\n",
4912 (unsigned long long)
4913 atomic64_read(&mddev->resync_mismatches));
4916 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4919 sync_min_show(struct mddev *mddev, char *page)
4921 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4922 mddev->sync_speed_min ? "local": "system");
4926 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4931 if (strncmp(buf, "system", 6)==0) {
4934 rv = kstrtouint(buf, 10, &min);
4940 mddev->sync_speed_min = min;
4944 static struct md_sysfs_entry md_sync_min =
4945 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4948 sync_max_show(struct mddev *mddev, char *page)
4950 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4951 mddev->sync_speed_max ? "local": "system");
4955 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4960 if (strncmp(buf, "system", 6)==0) {
4963 rv = kstrtouint(buf, 10, &max);
4969 mddev->sync_speed_max = max;
4973 static struct md_sysfs_entry md_sync_max =
4974 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4977 degraded_show(struct mddev *mddev, char *page)
4979 return sprintf(page, "%d\n", mddev->degraded);
4981 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4984 sync_force_parallel_show(struct mddev *mddev, char *page)
4986 return sprintf(page, "%d\n", mddev->parallel_resync);
4990 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4994 if (kstrtol(buf, 10, &n))
4997 if (n != 0 && n != 1)
5000 mddev->parallel_resync = n;
5002 if (mddev->sync_thread)
5003 wake_up(&resync_wait);
5008 /* force parallel resync, even with shared block devices */
5009 static struct md_sysfs_entry md_sync_force_parallel =
5010 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5011 sync_force_parallel_show, sync_force_parallel_store);
5014 sync_speed_show(struct mddev *mddev, char *page)
5016 unsigned long resync, dt, db;
5017 if (mddev->curr_resync == 0)
5018 return sprintf(page, "none\n");
5019 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5020 dt = (jiffies - mddev->resync_mark) / HZ;
5022 db = resync - mddev->resync_mark_cnt;
5023 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5026 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5029 sync_completed_show(struct mddev *mddev, char *page)
5031 unsigned long long max_sectors, resync;
5033 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5034 return sprintf(page, "none\n");
5036 if (mddev->curr_resync == 1 ||
5037 mddev->curr_resync == 2)
5038 return sprintf(page, "delayed\n");
5040 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5041 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5042 max_sectors = mddev->resync_max_sectors;
5044 max_sectors = mddev->dev_sectors;
5046 resync = mddev->curr_resync_completed;
5047 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5050 static struct md_sysfs_entry md_sync_completed =
5051 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5054 min_sync_show(struct mddev *mddev, char *page)
5056 return sprintf(page, "%llu\n",
5057 (unsigned long long)mddev->resync_min);
5060 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5062 unsigned long long min;
5065 if (kstrtoull(buf, 10, &min))
5068 spin_lock(&mddev->lock);
5070 if (min > mddev->resync_max)
5074 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5077 /* Round down to multiple of 4K for safety */
5078 mddev->resync_min = round_down(min, 8);
5082 spin_unlock(&mddev->lock);
5086 static struct md_sysfs_entry md_min_sync =
5087 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5090 max_sync_show(struct mddev *mddev, char *page)
5092 if (mddev->resync_max == MaxSector)
5093 return sprintf(page, "max\n");
5095 return sprintf(page, "%llu\n",
5096 (unsigned long long)mddev->resync_max);
5099 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5102 spin_lock(&mddev->lock);
5103 if (strncmp(buf, "max", 3) == 0)
5104 mddev->resync_max = MaxSector;
5106 unsigned long long max;
5110 if (kstrtoull(buf, 10, &max))
5112 if (max < mddev->resync_min)
5116 if (max < mddev->resync_max &&
5118 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5121 /* Must be a multiple of chunk_size */
5122 chunk = mddev->chunk_sectors;
5124 sector_t temp = max;
5127 if (sector_div(temp, chunk))
5130 mddev->resync_max = max;
5132 wake_up(&mddev->recovery_wait);
5135 spin_unlock(&mddev->lock);
5139 static struct md_sysfs_entry md_max_sync =
5140 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5143 suspend_lo_show(struct mddev *mddev, char *page)
5145 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5149 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5151 unsigned long long new;
5154 err = kstrtoull(buf, 10, &new);
5157 if (new != (sector_t)new)
5160 err = mddev_lock(mddev);
5164 if (mddev->pers == NULL ||
5165 mddev->pers->quiesce == NULL)
5167 mddev_suspend(mddev);
5168 mddev->suspend_lo = new;
5169 mddev_resume(mddev);
5173 mddev_unlock(mddev);
5176 static struct md_sysfs_entry md_suspend_lo =
5177 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5180 suspend_hi_show(struct mddev *mddev, char *page)
5182 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5186 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5188 unsigned long long new;
5191 err = kstrtoull(buf, 10, &new);
5194 if (new != (sector_t)new)
5197 err = mddev_lock(mddev);
5201 if (mddev->pers == NULL)
5204 mddev_suspend(mddev);
5205 mddev->suspend_hi = new;
5206 mddev_resume(mddev);
5210 mddev_unlock(mddev);
5213 static struct md_sysfs_entry md_suspend_hi =
5214 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5217 reshape_position_show(struct mddev *mddev, char *page)
5219 if (mddev->reshape_position != MaxSector)
5220 return sprintf(page, "%llu\n",
5221 (unsigned long long)mddev->reshape_position);
5222 strcpy(page, "none\n");
5227 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5229 struct md_rdev *rdev;
5230 unsigned long long new;
5233 err = kstrtoull(buf, 10, &new);
5236 if (new != (sector_t)new)
5238 err = mddev_lock(mddev);
5244 mddev->reshape_position = new;
5245 mddev->delta_disks = 0;
5246 mddev->reshape_backwards = 0;
5247 mddev->new_level = mddev->level;
5248 mddev->new_layout = mddev->layout;
5249 mddev->new_chunk_sectors = mddev->chunk_sectors;
5250 rdev_for_each(rdev, mddev)
5251 rdev->new_data_offset = rdev->data_offset;
5254 mddev_unlock(mddev);
5258 static struct md_sysfs_entry md_reshape_position =
5259 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5260 reshape_position_store);
5263 reshape_direction_show(struct mddev *mddev, char *page)
5265 return sprintf(page, "%s\n",
5266 mddev->reshape_backwards ? "backwards" : "forwards");
5270 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5275 if (cmd_match(buf, "forwards"))
5277 else if (cmd_match(buf, "backwards"))
5281 if (mddev->reshape_backwards == backwards)
5284 err = mddev_lock(mddev);
5287 /* check if we are allowed to change */
5288 if (mddev->delta_disks)
5290 else if (mddev->persistent &&
5291 mddev->major_version == 0)
5294 mddev->reshape_backwards = backwards;
5295 mddev_unlock(mddev);
5299 static struct md_sysfs_entry md_reshape_direction =
5300 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5301 reshape_direction_store);
5304 array_size_show(struct mddev *mddev, char *page)
5306 if (mddev->external_size)
5307 return sprintf(page, "%llu\n",
5308 (unsigned long long)mddev->array_sectors/2);
5310 return sprintf(page, "default\n");
5314 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5319 err = mddev_lock(mddev);
5323 /* cluster raid doesn't support change array_sectors */
5324 if (mddev_is_clustered(mddev)) {
5325 mddev_unlock(mddev);
5329 if (strncmp(buf, "default", 7) == 0) {
5331 sectors = mddev->pers->size(mddev, 0, 0);
5333 sectors = mddev->array_sectors;
5335 mddev->external_size = 0;
5337 if (strict_blocks_to_sectors(buf, §ors) < 0)
5339 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5342 mddev->external_size = 1;
5346 mddev->array_sectors = sectors;
5348 set_capacity_and_notify(mddev->gendisk,
5349 mddev->array_sectors);
5351 mddev_unlock(mddev);
5355 static struct md_sysfs_entry md_array_size =
5356 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5360 consistency_policy_show(struct mddev *mddev, char *page)
5364 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5365 ret = sprintf(page, "journal\n");
5366 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5367 ret = sprintf(page, "ppl\n");
5368 } else if (mddev->bitmap) {
5369 ret = sprintf(page, "bitmap\n");
5370 } else if (mddev->pers) {
5371 if (mddev->pers->sync_request)
5372 ret = sprintf(page, "resync\n");
5374 ret = sprintf(page, "none\n");
5376 ret = sprintf(page, "unknown\n");
5383 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5388 if (mddev->pers->change_consistency_policy)
5389 err = mddev->pers->change_consistency_policy(mddev, buf);
5392 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5393 set_bit(MD_HAS_PPL, &mddev->flags);
5398 return err ? err : len;
5401 static struct md_sysfs_entry md_consistency_policy =
5402 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5403 consistency_policy_store);
5405 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5407 return sprintf(page, "%d\n", mddev->fail_last_dev);
5411 * Setting fail_last_dev to true to allow last device to be forcibly removed
5412 * from RAID1/RAID10.
5415 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5420 ret = kstrtobool(buf, &value);
5424 if (value != mddev->fail_last_dev)
5425 mddev->fail_last_dev = value;
5429 static struct md_sysfs_entry md_fail_last_dev =
5430 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5431 fail_last_dev_store);
5433 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5435 if (mddev->pers == NULL || (mddev->pers->level != 1))
5436 return sprintf(page, "n/a\n");
5438 return sprintf(page, "%d\n", mddev->serialize_policy);
5442 * Setting serialize_policy to true to enforce write IO is not reordered
5446 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5451 err = kstrtobool(buf, &value);
5455 if (value == mddev->serialize_policy)
5458 err = mddev_lock(mddev);
5461 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5462 pr_err("md: serialize_policy is only effective for raid1\n");
5467 mddev_suspend(mddev);
5469 mddev_create_serial_pool(mddev, NULL, true);
5471 mddev_destroy_serial_pool(mddev, NULL, true);
5472 mddev->serialize_policy = value;
5473 mddev_resume(mddev);
5475 mddev_unlock(mddev);
5479 static struct md_sysfs_entry md_serialize_policy =
5480 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5481 serialize_policy_store);
5484 static struct attribute *md_default_attrs[] = {
5487 &md_raid_disks.attr,
5489 &md_chunk_size.attr,
5491 &md_resync_start.attr,
5493 &md_new_device.attr,
5494 &md_safe_delay.attr,
5495 &md_array_state.attr,
5496 &md_reshape_position.attr,
5497 &md_reshape_direction.attr,
5498 &md_array_size.attr,
5499 &max_corr_read_errors.attr,
5500 &md_consistency_policy.attr,
5501 &md_fail_last_dev.attr,
5502 &md_serialize_policy.attr,
5506 static const struct attribute_group md_default_group = {
5507 .attrs = md_default_attrs,
5510 static struct attribute *md_redundancy_attrs[] = {
5512 &md_last_scan_mode.attr,
5513 &md_mismatches.attr,
5516 &md_sync_speed.attr,
5517 &md_sync_force_parallel.attr,
5518 &md_sync_completed.attr,
5521 &md_suspend_lo.attr,
5522 &md_suspend_hi.attr,
5527 static const struct attribute_group md_redundancy_group = {
5529 .attrs = md_redundancy_attrs,
5532 static const struct attribute_group *md_attr_groups[] = {
5539 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5541 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5542 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5547 spin_lock(&all_mddevs_lock);
5548 if (list_empty(&mddev->all_mddevs)) {
5549 spin_unlock(&all_mddevs_lock);
5553 spin_unlock(&all_mddevs_lock);
5555 rv = entry->show(mddev, page);
5561 md_attr_store(struct kobject *kobj, struct attribute *attr,
5562 const char *page, size_t length)
5564 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5565 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5570 if (!capable(CAP_SYS_ADMIN))
5572 spin_lock(&all_mddevs_lock);
5573 if (list_empty(&mddev->all_mddevs)) {
5574 spin_unlock(&all_mddevs_lock);
5578 spin_unlock(&all_mddevs_lock);
5579 rv = entry->store(mddev, page, length);
5584 static void md_free(struct kobject *ko)
5586 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5588 if (mddev->sysfs_state)
5589 sysfs_put(mddev->sysfs_state);
5590 if (mddev->sysfs_level)
5591 sysfs_put(mddev->sysfs_level);
5593 if (mddev->gendisk) {
5594 del_gendisk(mddev->gendisk);
5595 blk_cleanup_disk(mddev->gendisk);
5597 percpu_ref_exit(&mddev->writes_pending);
5599 bioset_exit(&mddev->bio_set);
5600 bioset_exit(&mddev->sync_set);
5601 if (mddev->level != 1 && mddev->level != 10)
5602 bioset_exit(&mddev->io_acct_set);
5606 static const struct sysfs_ops md_sysfs_ops = {
5607 .show = md_attr_show,
5608 .store = md_attr_store,
5610 static struct kobj_type md_ktype = {
5612 .sysfs_ops = &md_sysfs_ops,
5613 .default_groups = md_attr_groups,
5618 static void mddev_delayed_delete(struct work_struct *ws)
5620 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5622 kobject_del(&mddev->kobj);
5623 kobject_put(&mddev->kobj);
5626 static void no_op(struct percpu_ref *r) {}
5628 int mddev_init_writes_pending(struct mddev *mddev)
5630 if (mddev->writes_pending.percpu_count_ptr)
5632 if (percpu_ref_init(&mddev->writes_pending, no_op,
5633 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5635 /* We want to start with the refcount at zero */
5636 percpu_ref_put(&mddev->writes_pending);
5639 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5641 static int md_alloc(dev_t dev, char *name)
5644 * If dev is zero, name is the name of a device to allocate with
5645 * an arbitrary minor number. It will be "md_???"
5646 * If dev is non-zero it must be a device number with a MAJOR of
5647 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5648 * the device is being created by opening a node in /dev.
5649 * If "name" is not NULL, the device is being created by
5650 * writing to /sys/module/md_mod/parameters/new_array.
5652 static DEFINE_MUTEX(disks_mutex);
5653 struct mddev *mddev;
5654 struct gendisk *disk;
5661 * Wait for any previous instance of this device to be completely
5662 * removed (mddev_delayed_delete).
5664 flush_workqueue(md_misc_wq);
5666 mutex_lock(&disks_mutex);
5667 mddev = mddev_alloc(dev);
5668 if (IS_ERR(mddev)) {
5669 mutex_unlock(&disks_mutex);
5670 return PTR_ERR(mddev);
5673 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5674 shift = partitioned ? MdpMinorShift : 0;
5675 unit = MINOR(mddev->unit) >> shift;
5678 /* Need to ensure that 'name' is not a duplicate.
5680 struct mddev *mddev2;
5681 spin_lock(&all_mddevs_lock);
5683 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5684 if (mddev2->gendisk &&
5685 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5686 spin_unlock(&all_mddevs_lock);
5688 goto out_unlock_disks_mutex;
5690 spin_unlock(&all_mddevs_lock);
5694 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5696 mddev->hold_active = UNTIL_STOP;
5699 disk = blk_alloc_disk(NUMA_NO_NODE);
5701 goto out_unlock_disks_mutex;
5703 disk->major = MAJOR(mddev->unit);
5704 disk->first_minor = unit << shift;
5705 disk->minors = 1 << shift;
5707 strcpy(disk->disk_name, name);
5708 else if (partitioned)
5709 sprintf(disk->disk_name, "md_d%d", unit);
5711 sprintf(disk->disk_name, "md%d", unit);
5712 disk->fops = &md_fops;
5713 disk->private_data = mddev;
5715 mddev->queue = disk->queue;
5716 blk_set_stacking_limits(&mddev->queue->limits);
5717 blk_queue_write_cache(mddev->queue, true, true);
5718 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5719 mddev->gendisk = disk;
5720 error = add_disk(disk);
5722 goto out_cleanup_disk;
5724 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5726 goto out_del_gendisk;
5728 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5729 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5730 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5731 goto out_unlock_disks_mutex;
5736 blk_cleanup_disk(disk);
5737 out_unlock_disks_mutex:
5738 mutex_unlock(&disks_mutex);
5743 static void md_probe(dev_t dev)
5745 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5748 md_alloc(dev, NULL);
5751 static int add_named_array(const char *val, const struct kernel_param *kp)
5754 * val must be "md_*" or "mdNNN".
5755 * For "md_*" we allocate an array with a large free minor number, and
5756 * set the name to val. val must not already be an active name.
5757 * For "mdNNN" we allocate an array with the minor number NNN
5758 * which must not already be in use.
5760 int len = strlen(val);
5761 char buf[DISK_NAME_LEN];
5762 unsigned long devnum;
5764 while (len && val[len-1] == '\n')
5766 if (len >= DISK_NAME_LEN)
5768 strscpy(buf, val, len+1);
5769 if (strncmp(buf, "md_", 3) == 0)
5770 return md_alloc(0, buf);
5771 if (strncmp(buf, "md", 2) == 0 &&
5773 kstrtoul(buf+2, 10, &devnum) == 0 &&
5774 devnum <= MINORMASK)
5775 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5780 static void md_safemode_timeout(struct timer_list *t)
5782 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5784 mddev->safemode = 1;
5785 if (mddev->external)
5786 sysfs_notify_dirent_safe(mddev->sysfs_state);
5788 md_wakeup_thread(mddev->thread);
5791 static int start_dirty_degraded;
5793 int md_run(struct mddev *mddev)
5796 struct md_rdev *rdev;
5797 struct md_personality *pers;
5800 if (list_empty(&mddev->disks))
5801 /* cannot run an array with no devices.. */
5806 /* Cannot run until previous stop completes properly */
5807 if (mddev->sysfs_active)
5811 * Analyze all RAID superblock(s)
5813 if (!mddev->raid_disks) {
5814 if (!mddev->persistent)
5816 err = analyze_sbs(mddev);
5821 if (mddev->level != LEVEL_NONE)
5822 request_module("md-level-%d", mddev->level);
5823 else if (mddev->clevel[0])
5824 request_module("md-%s", mddev->clevel);
5827 * Drop all container device buffers, from now on
5828 * the only valid external interface is through the md
5831 mddev->has_superblocks = false;
5832 rdev_for_each(rdev, mddev) {
5833 if (test_bit(Faulty, &rdev->flags))
5835 sync_blockdev(rdev->bdev);
5836 invalidate_bdev(rdev->bdev);
5837 if (mddev->ro != 1 && rdev_read_only(rdev)) {
5840 set_disk_ro(mddev->gendisk, 1);
5844 mddev->has_superblocks = true;
5846 /* perform some consistency tests on the device.
5847 * We don't want the data to overlap the metadata,
5848 * Internal Bitmap issues have been handled elsewhere.
5850 if (rdev->meta_bdev) {
5851 /* Nothing to check */;
5852 } else if (rdev->data_offset < rdev->sb_start) {
5853 if (mddev->dev_sectors &&
5854 rdev->data_offset + mddev->dev_sectors
5856 pr_warn("md: %s: data overlaps metadata\n",
5861 if (rdev->sb_start + rdev->sb_size/512
5862 > rdev->data_offset) {
5863 pr_warn("md: %s: metadata overlaps data\n",
5868 sysfs_notify_dirent_safe(rdev->sysfs_state);
5869 nowait = nowait && blk_queue_nowait(bdev_get_queue(rdev->bdev));
5872 if (!bioset_initialized(&mddev->bio_set)) {
5873 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5877 if (!bioset_initialized(&mddev->sync_set)) {
5878 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5883 spin_lock(&pers_lock);
5884 pers = find_pers(mddev->level, mddev->clevel);
5885 if (!pers || !try_module_get(pers->owner)) {
5886 spin_unlock(&pers_lock);
5887 if (mddev->level != LEVEL_NONE)
5888 pr_warn("md: personality for level %d is not loaded!\n",
5891 pr_warn("md: personality for level %s is not loaded!\n",
5896 spin_unlock(&pers_lock);
5897 if (mddev->level != pers->level) {
5898 mddev->level = pers->level;
5899 mddev->new_level = pers->level;
5901 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5903 if (mddev->reshape_position != MaxSector &&
5904 pers->start_reshape == NULL) {
5905 /* This personality cannot handle reshaping... */
5906 module_put(pers->owner);
5911 if (pers->sync_request) {
5912 /* Warn if this is a potentially silly
5915 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5916 struct md_rdev *rdev2;
5919 rdev_for_each(rdev, mddev)
5920 rdev_for_each(rdev2, mddev) {
5922 rdev->bdev->bd_disk ==
5923 rdev2->bdev->bd_disk) {
5924 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5926 bdevname(rdev->bdev,b),
5927 bdevname(rdev2->bdev,b2));
5933 pr_warn("True protection against single-disk failure might be compromised.\n");
5936 mddev->recovery = 0;
5937 /* may be over-ridden by personality */
5938 mddev->resync_max_sectors = mddev->dev_sectors;
5940 mddev->ok_start_degraded = start_dirty_degraded;
5942 if (start_readonly && mddev->ro == 0)
5943 mddev->ro = 2; /* read-only, but switch on first write */
5945 err = pers->run(mddev);
5947 pr_warn("md: pers->run() failed ...\n");
5948 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5949 WARN_ONCE(!mddev->external_size,
5950 "%s: default size too small, but 'external_size' not in effect?\n",
5952 pr_warn("md: invalid array_size %llu > default size %llu\n",
5953 (unsigned long long)mddev->array_sectors / 2,
5954 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5957 if (err == 0 && pers->sync_request &&
5958 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5959 struct bitmap *bitmap;
5961 bitmap = md_bitmap_create(mddev, -1);
5962 if (IS_ERR(bitmap)) {
5963 err = PTR_ERR(bitmap);
5964 pr_warn("%s: failed to create bitmap (%d)\n",
5965 mdname(mddev), err);
5967 mddev->bitmap = bitmap;
5973 if (mddev->bitmap_info.max_write_behind > 0) {
5974 bool create_pool = false;
5976 rdev_for_each(rdev, mddev) {
5977 if (test_bit(WriteMostly, &rdev->flags) &&
5978 rdev_init_serial(rdev))
5981 if (create_pool && mddev->serial_info_pool == NULL) {
5982 mddev->serial_info_pool =
5983 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5984 sizeof(struct serial_info));
5985 if (!mddev->serial_info_pool) {
5995 rdev_for_each(rdev, mddev) {
5996 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
6001 if (mddev->degraded)
6004 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6006 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6007 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6009 /* Set the NOWAIT flags if all underlying devices support it */
6011 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
6013 if (pers->sync_request) {
6014 if (mddev->kobj.sd &&
6015 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6016 pr_warn("md: cannot register extra attributes for %s\n",
6018 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6019 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6020 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6021 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6024 atomic_set(&mddev->max_corr_read_errors,
6025 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6026 mddev->safemode = 0;
6027 if (mddev_is_clustered(mddev))
6028 mddev->safemode_delay = 0;
6030 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6033 spin_lock(&mddev->lock);
6035 spin_unlock(&mddev->lock);
6036 rdev_for_each(rdev, mddev)
6037 if (rdev->raid_disk >= 0)
6038 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6040 if (mddev->degraded && !mddev->ro)
6041 /* This ensures that recovering status is reported immediately
6042 * via sysfs - until a lack of spares is confirmed.
6044 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6045 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6047 if (mddev->sb_flags)
6048 md_update_sb(mddev, 0);
6054 mddev_detach(mddev);
6056 pers->free(mddev, mddev->private);
6057 mddev->private = NULL;
6058 module_put(pers->owner);
6059 md_bitmap_destroy(mddev);
6061 bioset_exit(&mddev->sync_set);
6063 bioset_exit(&mddev->bio_set);
6066 EXPORT_SYMBOL_GPL(md_run);
6068 int do_md_run(struct mddev *mddev)
6072 set_bit(MD_NOT_READY, &mddev->flags);
6073 err = md_run(mddev);
6076 err = md_bitmap_load(mddev);
6078 md_bitmap_destroy(mddev);
6082 if (mddev_is_clustered(mddev))
6083 md_allow_write(mddev);
6085 /* run start up tasks that require md_thread */
6088 md_wakeup_thread(mddev->thread);
6089 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6091 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6092 clear_bit(MD_NOT_READY, &mddev->flags);
6094 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6095 sysfs_notify_dirent_safe(mddev->sysfs_state);
6096 sysfs_notify_dirent_safe(mddev->sysfs_action);
6097 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6099 clear_bit(MD_NOT_READY, &mddev->flags);
6103 int md_start(struct mddev *mddev)
6107 if (mddev->pers->start) {
6108 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6109 md_wakeup_thread(mddev->thread);
6110 ret = mddev->pers->start(mddev);
6111 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6112 md_wakeup_thread(mddev->sync_thread);
6116 EXPORT_SYMBOL_GPL(md_start);
6118 static int restart_array(struct mddev *mddev)
6120 struct gendisk *disk = mddev->gendisk;
6121 struct md_rdev *rdev;
6122 bool has_journal = false;
6123 bool has_readonly = false;
6125 /* Complain if it has no devices */
6126 if (list_empty(&mddev->disks))
6134 rdev_for_each_rcu(rdev, mddev) {
6135 if (test_bit(Journal, &rdev->flags) &&
6136 !test_bit(Faulty, &rdev->flags))
6138 if (rdev_read_only(rdev))
6139 has_readonly = true;
6142 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6143 /* Don't restart rw with journal missing/faulty */
6148 mddev->safemode = 0;
6150 set_disk_ro(disk, 0);
6151 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6152 /* Kick recovery or resync if necessary */
6153 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6154 md_wakeup_thread(mddev->thread);
6155 md_wakeup_thread(mddev->sync_thread);
6156 sysfs_notify_dirent_safe(mddev->sysfs_state);
6160 static void md_clean(struct mddev *mddev)
6162 mddev->array_sectors = 0;
6163 mddev->external_size = 0;
6164 mddev->dev_sectors = 0;
6165 mddev->raid_disks = 0;
6166 mddev->recovery_cp = 0;
6167 mddev->resync_min = 0;
6168 mddev->resync_max = MaxSector;
6169 mddev->reshape_position = MaxSector;
6170 mddev->external = 0;
6171 mddev->persistent = 0;
6172 mddev->level = LEVEL_NONE;
6173 mddev->clevel[0] = 0;
6175 mddev->sb_flags = 0;
6177 mddev->metadata_type[0] = 0;
6178 mddev->chunk_sectors = 0;
6179 mddev->ctime = mddev->utime = 0;
6181 mddev->max_disks = 0;
6183 mddev->can_decrease_events = 0;
6184 mddev->delta_disks = 0;
6185 mddev->reshape_backwards = 0;
6186 mddev->new_level = LEVEL_NONE;
6187 mddev->new_layout = 0;
6188 mddev->new_chunk_sectors = 0;
6189 mddev->curr_resync = 0;
6190 atomic64_set(&mddev->resync_mismatches, 0);
6191 mddev->suspend_lo = mddev->suspend_hi = 0;
6192 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6193 mddev->recovery = 0;
6196 mddev->degraded = 0;
6197 mddev->safemode = 0;
6198 mddev->private = NULL;
6199 mddev->cluster_info = NULL;
6200 mddev->bitmap_info.offset = 0;
6201 mddev->bitmap_info.default_offset = 0;
6202 mddev->bitmap_info.default_space = 0;
6203 mddev->bitmap_info.chunksize = 0;
6204 mddev->bitmap_info.daemon_sleep = 0;
6205 mddev->bitmap_info.max_write_behind = 0;
6206 mddev->bitmap_info.nodes = 0;
6209 static void __md_stop_writes(struct mddev *mddev)
6211 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6212 if (work_pending(&mddev->del_work))
6213 flush_workqueue(md_misc_wq);
6214 if (mddev->sync_thread) {
6215 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6216 md_reap_sync_thread(mddev);
6219 del_timer_sync(&mddev->safemode_timer);
6221 if (mddev->pers && mddev->pers->quiesce) {
6222 mddev->pers->quiesce(mddev, 1);
6223 mddev->pers->quiesce(mddev, 0);
6225 md_bitmap_flush(mddev);
6227 if (mddev->ro == 0 &&
6228 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6230 /* mark array as shutdown cleanly */
6231 if (!mddev_is_clustered(mddev))
6233 md_update_sb(mddev, 1);
6235 /* disable policy to guarantee rdevs free resources for serialization */
6236 mddev->serialize_policy = 0;
6237 mddev_destroy_serial_pool(mddev, NULL, true);
6240 void md_stop_writes(struct mddev *mddev)
6242 mddev_lock_nointr(mddev);
6243 __md_stop_writes(mddev);
6244 mddev_unlock(mddev);
6246 EXPORT_SYMBOL_GPL(md_stop_writes);
6248 static void mddev_detach(struct mddev *mddev)
6250 md_bitmap_wait_behind_writes(mddev);
6251 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6252 mddev->pers->quiesce(mddev, 1);
6253 mddev->pers->quiesce(mddev, 0);
6255 md_unregister_thread(&mddev->thread);
6257 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6260 static void __md_stop(struct mddev *mddev)
6262 struct md_personality *pers = mddev->pers;
6263 md_bitmap_destroy(mddev);
6264 mddev_detach(mddev);
6265 /* Ensure ->event_work is done */
6266 if (mddev->event_work.func)
6267 flush_workqueue(md_misc_wq);
6268 spin_lock(&mddev->lock);
6270 spin_unlock(&mddev->lock);
6272 pers->free(mddev, mddev->private);
6273 mddev->private = NULL;
6274 if (pers->sync_request && mddev->to_remove == NULL)
6275 mddev->to_remove = &md_redundancy_group;
6276 module_put(pers->owner);
6277 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6280 void md_stop(struct mddev *mddev)
6282 /* stop the array and free an attached data structures.
6283 * This is called from dm-raid
6286 bioset_exit(&mddev->bio_set);
6287 bioset_exit(&mddev->sync_set);
6288 if (mddev->level != 1 && mddev->level != 10)
6289 bioset_exit(&mddev->io_acct_set);
6292 EXPORT_SYMBOL_GPL(md_stop);
6294 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6299 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6301 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6302 md_wakeup_thread(mddev->thread);
6304 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6305 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6306 if (mddev->sync_thread)
6307 /* Thread might be blocked waiting for metadata update
6308 * which will now never happen */
6309 wake_up_process(mddev->sync_thread->tsk);
6311 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6313 mddev_unlock(mddev);
6314 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6316 wait_event(mddev->sb_wait,
6317 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6318 mddev_lock_nointr(mddev);
6320 mutex_lock(&mddev->open_mutex);
6321 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6322 mddev->sync_thread ||
6323 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6324 pr_warn("md: %s still in use.\n",mdname(mddev));
6326 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6327 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6328 md_wakeup_thread(mddev->thread);
6334 __md_stop_writes(mddev);
6340 set_disk_ro(mddev->gendisk, 1);
6341 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6342 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6343 md_wakeup_thread(mddev->thread);
6344 sysfs_notify_dirent_safe(mddev->sysfs_state);
6348 mutex_unlock(&mddev->open_mutex);
6353 * 0 - completely stop and dis-assemble array
6354 * 2 - stop but do not disassemble array
6356 static int do_md_stop(struct mddev *mddev, int mode,
6357 struct block_device *bdev)
6359 struct gendisk *disk = mddev->gendisk;
6360 struct md_rdev *rdev;
6363 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6365 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6366 md_wakeup_thread(mddev->thread);
6368 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6369 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6370 if (mddev->sync_thread)
6371 /* Thread might be blocked waiting for metadata update
6372 * which will now never happen */
6373 wake_up_process(mddev->sync_thread->tsk);
6375 mddev_unlock(mddev);
6376 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6377 !test_bit(MD_RECOVERY_RUNNING,
6378 &mddev->recovery)));
6379 mddev_lock_nointr(mddev);
6381 mutex_lock(&mddev->open_mutex);
6382 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6383 mddev->sysfs_active ||
6384 mddev->sync_thread ||
6385 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6386 pr_warn("md: %s still in use.\n",mdname(mddev));
6387 mutex_unlock(&mddev->open_mutex);
6389 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6390 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6391 md_wakeup_thread(mddev->thread);
6397 set_disk_ro(disk, 0);
6399 __md_stop_writes(mddev);
6402 /* tell userspace to handle 'inactive' */
6403 sysfs_notify_dirent_safe(mddev->sysfs_state);
6405 rdev_for_each(rdev, mddev)
6406 if (rdev->raid_disk >= 0)
6407 sysfs_unlink_rdev(mddev, rdev);
6409 set_capacity_and_notify(disk, 0);
6410 mutex_unlock(&mddev->open_mutex);
6416 mutex_unlock(&mddev->open_mutex);
6418 * Free resources if final stop
6421 pr_info("md: %s stopped.\n", mdname(mddev));
6423 if (mddev->bitmap_info.file) {
6424 struct file *f = mddev->bitmap_info.file;
6425 spin_lock(&mddev->lock);
6426 mddev->bitmap_info.file = NULL;
6427 spin_unlock(&mddev->lock);
6430 mddev->bitmap_info.offset = 0;
6432 export_array(mddev);
6435 if (mddev->hold_active == UNTIL_STOP)
6436 mddev->hold_active = 0;
6439 sysfs_notify_dirent_safe(mddev->sysfs_state);
6444 static void autorun_array(struct mddev *mddev)
6446 struct md_rdev *rdev;
6449 if (list_empty(&mddev->disks))
6452 pr_info("md: running: ");
6454 rdev_for_each(rdev, mddev) {
6455 char b[BDEVNAME_SIZE];
6456 pr_cont("<%s>", bdevname(rdev->bdev,b));
6460 err = do_md_run(mddev);
6462 pr_warn("md: do_md_run() returned %d\n", err);
6463 do_md_stop(mddev, 0, NULL);
6468 * lets try to run arrays based on all disks that have arrived
6469 * until now. (those are in pending_raid_disks)
6471 * the method: pick the first pending disk, collect all disks with
6472 * the same UUID, remove all from the pending list and put them into
6473 * the 'same_array' list. Then order this list based on superblock
6474 * update time (freshest comes first), kick out 'old' disks and
6475 * compare superblocks. If everything's fine then run it.
6477 * If "unit" is allocated, then bump its reference count
6479 static void autorun_devices(int part)
6481 struct md_rdev *rdev0, *rdev, *tmp;
6482 struct mddev *mddev;
6483 char b[BDEVNAME_SIZE];
6485 pr_info("md: autorun ...\n");
6486 while (!list_empty(&pending_raid_disks)) {
6489 LIST_HEAD(candidates);
6490 rdev0 = list_entry(pending_raid_disks.next,
6491 struct md_rdev, same_set);
6493 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6494 INIT_LIST_HEAD(&candidates);
6495 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6496 if (super_90_load(rdev, rdev0, 0) >= 0) {
6497 pr_debug("md: adding %s ...\n",
6498 bdevname(rdev->bdev,b));
6499 list_move(&rdev->same_set, &candidates);
6502 * now we have a set of devices, with all of them having
6503 * mostly sane superblocks. It's time to allocate the
6507 dev = MKDEV(mdp_major,
6508 rdev0->preferred_minor << MdpMinorShift);
6509 unit = MINOR(dev) >> MdpMinorShift;
6511 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6514 if (rdev0->preferred_minor != unit) {
6515 pr_warn("md: unit number in %s is bad: %d\n",
6516 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6521 mddev = mddev_find(dev);
6525 if (mddev_lock(mddev))
6526 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6527 else if (mddev->raid_disks || mddev->major_version
6528 || !list_empty(&mddev->disks)) {
6529 pr_warn("md: %s already running, cannot run %s\n",
6530 mdname(mddev), bdevname(rdev0->bdev,b));
6531 mddev_unlock(mddev);
6533 pr_debug("md: created %s\n", mdname(mddev));
6534 mddev->persistent = 1;
6535 rdev_for_each_list(rdev, tmp, &candidates) {
6536 list_del_init(&rdev->same_set);
6537 if (bind_rdev_to_array(rdev, mddev))
6540 autorun_array(mddev);
6541 mddev_unlock(mddev);
6543 /* on success, candidates will be empty, on error
6546 rdev_for_each_list(rdev, tmp, &candidates) {
6547 list_del_init(&rdev->same_set);
6552 pr_info("md: ... autorun DONE.\n");
6554 #endif /* !MODULE */
6556 static int get_version(void __user *arg)
6560 ver.major = MD_MAJOR_VERSION;
6561 ver.minor = MD_MINOR_VERSION;
6562 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6564 if (copy_to_user(arg, &ver, sizeof(ver)))
6570 static int get_array_info(struct mddev *mddev, void __user *arg)
6572 mdu_array_info_t info;
6573 int nr,working,insync,failed,spare;
6574 struct md_rdev *rdev;
6576 nr = working = insync = failed = spare = 0;
6578 rdev_for_each_rcu(rdev, mddev) {
6580 if (test_bit(Faulty, &rdev->flags))
6584 if (test_bit(In_sync, &rdev->flags))
6586 else if (test_bit(Journal, &rdev->flags))
6587 /* TODO: add journal count to md_u.h */
6595 info.major_version = mddev->major_version;
6596 info.minor_version = mddev->minor_version;
6597 info.patch_version = MD_PATCHLEVEL_VERSION;
6598 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6599 info.level = mddev->level;
6600 info.size = mddev->dev_sectors / 2;
6601 if (info.size != mddev->dev_sectors / 2) /* overflow */
6604 info.raid_disks = mddev->raid_disks;
6605 info.md_minor = mddev->md_minor;
6606 info.not_persistent= !mddev->persistent;
6608 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6611 info.state = (1<<MD_SB_CLEAN);
6612 if (mddev->bitmap && mddev->bitmap_info.offset)
6613 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6614 if (mddev_is_clustered(mddev))
6615 info.state |= (1<<MD_SB_CLUSTERED);
6616 info.active_disks = insync;
6617 info.working_disks = working;
6618 info.failed_disks = failed;
6619 info.spare_disks = spare;
6621 info.layout = mddev->layout;
6622 info.chunk_size = mddev->chunk_sectors << 9;
6624 if (copy_to_user(arg, &info, sizeof(info)))
6630 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6632 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6636 file = kzalloc(sizeof(*file), GFP_NOIO);
6641 spin_lock(&mddev->lock);
6642 /* bitmap enabled */
6643 if (mddev->bitmap_info.file) {
6644 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6645 sizeof(file->pathname));
6649 memmove(file->pathname, ptr,
6650 sizeof(file->pathname)-(ptr-file->pathname));
6652 spin_unlock(&mddev->lock);
6655 copy_to_user(arg, file, sizeof(*file)))
6662 static int get_disk_info(struct mddev *mddev, void __user * arg)
6664 mdu_disk_info_t info;
6665 struct md_rdev *rdev;
6667 if (copy_from_user(&info, arg, sizeof(info)))
6671 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6673 info.major = MAJOR(rdev->bdev->bd_dev);
6674 info.minor = MINOR(rdev->bdev->bd_dev);
6675 info.raid_disk = rdev->raid_disk;
6677 if (test_bit(Faulty, &rdev->flags))
6678 info.state |= (1<<MD_DISK_FAULTY);
6679 else if (test_bit(In_sync, &rdev->flags)) {
6680 info.state |= (1<<MD_DISK_ACTIVE);
6681 info.state |= (1<<MD_DISK_SYNC);
6683 if (test_bit(Journal, &rdev->flags))
6684 info.state |= (1<<MD_DISK_JOURNAL);
6685 if (test_bit(WriteMostly, &rdev->flags))
6686 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6687 if (test_bit(FailFast, &rdev->flags))
6688 info.state |= (1<<MD_DISK_FAILFAST);
6690 info.major = info.minor = 0;
6691 info.raid_disk = -1;
6692 info.state = (1<<MD_DISK_REMOVED);
6696 if (copy_to_user(arg, &info, sizeof(info)))
6702 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6704 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6705 struct md_rdev *rdev;
6706 dev_t dev = MKDEV(info->major,info->minor);
6708 if (mddev_is_clustered(mddev) &&
6709 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6710 pr_warn("%s: Cannot add to clustered mddev.\n",
6715 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6718 if (!mddev->raid_disks) {
6720 /* expecting a device which has a superblock */
6721 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6723 pr_warn("md: md_import_device returned %ld\n",
6725 return PTR_ERR(rdev);
6727 if (!list_empty(&mddev->disks)) {
6728 struct md_rdev *rdev0
6729 = list_entry(mddev->disks.next,
6730 struct md_rdev, same_set);
6731 err = super_types[mddev->major_version]
6732 .load_super(rdev, rdev0, mddev->minor_version);
6734 pr_warn("md: %s has different UUID to %s\n",
6735 bdevname(rdev->bdev,b),
6736 bdevname(rdev0->bdev,b2));
6741 err = bind_rdev_to_array(rdev, mddev);
6748 * md_add_new_disk can be used once the array is assembled
6749 * to add "hot spares". They must already have a superblock
6754 if (!mddev->pers->hot_add_disk) {
6755 pr_warn("%s: personality does not support diskops!\n",
6759 if (mddev->persistent)
6760 rdev = md_import_device(dev, mddev->major_version,
6761 mddev->minor_version);
6763 rdev = md_import_device(dev, -1, -1);
6765 pr_warn("md: md_import_device returned %ld\n",
6767 return PTR_ERR(rdev);
6769 /* set saved_raid_disk if appropriate */
6770 if (!mddev->persistent) {
6771 if (info->state & (1<<MD_DISK_SYNC) &&
6772 info->raid_disk < mddev->raid_disks) {
6773 rdev->raid_disk = info->raid_disk;
6774 set_bit(In_sync, &rdev->flags);
6775 clear_bit(Bitmap_sync, &rdev->flags);
6777 rdev->raid_disk = -1;
6778 rdev->saved_raid_disk = rdev->raid_disk;
6780 super_types[mddev->major_version].
6781 validate_super(mddev, rdev);
6782 if ((info->state & (1<<MD_DISK_SYNC)) &&
6783 rdev->raid_disk != info->raid_disk) {
6784 /* This was a hot-add request, but events doesn't
6785 * match, so reject it.
6791 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6792 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6793 set_bit(WriteMostly, &rdev->flags);
6795 clear_bit(WriteMostly, &rdev->flags);
6796 if (info->state & (1<<MD_DISK_FAILFAST))
6797 set_bit(FailFast, &rdev->flags);
6799 clear_bit(FailFast, &rdev->flags);
6801 if (info->state & (1<<MD_DISK_JOURNAL)) {
6802 struct md_rdev *rdev2;
6803 bool has_journal = false;
6805 /* make sure no existing journal disk */
6806 rdev_for_each(rdev2, mddev) {
6807 if (test_bit(Journal, &rdev2->flags)) {
6812 if (has_journal || mddev->bitmap) {
6816 set_bit(Journal, &rdev->flags);
6819 * check whether the device shows up in other nodes
6821 if (mddev_is_clustered(mddev)) {
6822 if (info->state & (1 << MD_DISK_CANDIDATE))
6823 set_bit(Candidate, &rdev->flags);
6824 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6825 /* --add initiated by this node */
6826 err = md_cluster_ops->add_new_disk(mddev, rdev);
6834 rdev->raid_disk = -1;
6835 err = bind_rdev_to_array(rdev, mddev);
6840 if (mddev_is_clustered(mddev)) {
6841 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6843 err = md_cluster_ops->new_disk_ack(mddev,
6846 md_kick_rdev_from_array(rdev);
6850 md_cluster_ops->add_new_disk_cancel(mddev);
6852 err = add_bound_rdev(rdev);
6856 err = add_bound_rdev(rdev);
6861 /* otherwise, md_add_new_disk is only allowed
6862 * for major_version==0 superblocks
6864 if (mddev->major_version != 0) {
6865 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6869 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6871 rdev = md_import_device(dev, -1, 0);
6873 pr_warn("md: error, md_import_device() returned %ld\n",
6875 return PTR_ERR(rdev);
6877 rdev->desc_nr = info->number;
6878 if (info->raid_disk < mddev->raid_disks)
6879 rdev->raid_disk = info->raid_disk;
6881 rdev->raid_disk = -1;
6883 if (rdev->raid_disk < mddev->raid_disks)
6884 if (info->state & (1<<MD_DISK_SYNC))
6885 set_bit(In_sync, &rdev->flags);
6887 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6888 set_bit(WriteMostly, &rdev->flags);
6889 if (info->state & (1<<MD_DISK_FAILFAST))
6890 set_bit(FailFast, &rdev->flags);
6892 if (!mddev->persistent) {
6893 pr_debug("md: nonpersistent superblock ...\n");
6894 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6896 rdev->sb_start = calc_dev_sboffset(rdev);
6897 rdev->sectors = rdev->sb_start;
6899 err = bind_rdev_to_array(rdev, mddev);
6909 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6911 char b[BDEVNAME_SIZE];
6912 struct md_rdev *rdev;
6917 rdev = find_rdev(mddev, dev);
6921 if (rdev->raid_disk < 0)
6924 clear_bit(Blocked, &rdev->flags);
6925 remove_and_add_spares(mddev, rdev);
6927 if (rdev->raid_disk >= 0)
6931 if (mddev_is_clustered(mddev)) {
6932 if (md_cluster_ops->remove_disk(mddev, rdev))
6936 md_kick_rdev_from_array(rdev);
6937 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6939 md_wakeup_thread(mddev->thread);
6941 md_update_sb(mddev, 1);
6946 pr_debug("md: cannot remove active disk %s from %s ...\n",
6947 bdevname(rdev->bdev,b), mdname(mddev));
6951 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6953 char b[BDEVNAME_SIZE];
6955 struct md_rdev *rdev;
6960 if (mddev->major_version != 0) {
6961 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6965 if (!mddev->pers->hot_add_disk) {
6966 pr_warn("%s: personality does not support diskops!\n",
6971 rdev = md_import_device(dev, -1, 0);
6973 pr_warn("md: error, md_import_device() returned %ld\n",
6978 if (mddev->persistent)
6979 rdev->sb_start = calc_dev_sboffset(rdev);
6981 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6983 rdev->sectors = rdev->sb_start;
6985 if (test_bit(Faulty, &rdev->flags)) {
6986 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6987 bdevname(rdev->bdev,b), mdname(mddev));
6992 clear_bit(In_sync, &rdev->flags);
6994 rdev->saved_raid_disk = -1;
6995 err = bind_rdev_to_array(rdev, mddev);
7000 * The rest should better be atomic, we can have disk failures
7001 * noticed in interrupt contexts ...
7004 rdev->raid_disk = -1;
7006 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7008 md_update_sb(mddev, 1);
7010 * If the new disk does not support REQ_NOWAIT,
7011 * disable on the whole MD.
7013 if (!blk_queue_nowait(bdev_get_queue(rdev->bdev))) {
7014 pr_info("%s: Disabling nowait because %s does not support nowait\n",
7015 mdname(mddev), bdevname(rdev->bdev, b));
7016 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
7019 * Kick recovery, maybe this spare has to be added to the
7020 * array immediately.
7022 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7023 md_wakeup_thread(mddev->thread);
7032 static int set_bitmap_file(struct mddev *mddev, int fd)
7037 if (!mddev->pers->quiesce || !mddev->thread)
7039 if (mddev->recovery || mddev->sync_thread)
7041 /* we should be able to change the bitmap.. */
7045 struct inode *inode;
7048 if (mddev->bitmap || mddev->bitmap_info.file)
7049 return -EEXIST; /* cannot add when bitmap is present */
7053 pr_warn("%s: error: failed to get bitmap file\n",
7058 inode = f->f_mapping->host;
7059 if (!S_ISREG(inode->i_mode)) {
7060 pr_warn("%s: error: bitmap file must be a regular file\n",
7063 } else if (!(f->f_mode & FMODE_WRITE)) {
7064 pr_warn("%s: error: bitmap file must open for write\n",
7067 } else if (atomic_read(&inode->i_writecount) != 1) {
7068 pr_warn("%s: error: bitmap file is already in use\n",
7076 mddev->bitmap_info.file = f;
7077 mddev->bitmap_info.offset = 0; /* file overrides offset */
7078 } else if (mddev->bitmap == NULL)
7079 return -ENOENT; /* cannot remove what isn't there */
7083 struct bitmap *bitmap;
7085 bitmap = md_bitmap_create(mddev, -1);
7086 mddev_suspend(mddev);
7087 if (!IS_ERR(bitmap)) {
7088 mddev->bitmap = bitmap;
7089 err = md_bitmap_load(mddev);
7091 err = PTR_ERR(bitmap);
7093 md_bitmap_destroy(mddev);
7096 mddev_resume(mddev);
7097 } else if (fd < 0) {
7098 mddev_suspend(mddev);
7099 md_bitmap_destroy(mddev);
7100 mddev_resume(mddev);
7104 struct file *f = mddev->bitmap_info.file;
7106 spin_lock(&mddev->lock);
7107 mddev->bitmap_info.file = NULL;
7108 spin_unlock(&mddev->lock);
7117 * md_set_array_info is used two different ways
7118 * The original usage is when creating a new array.
7119 * In this usage, raid_disks is > 0 and it together with
7120 * level, size, not_persistent,layout,chunksize determine the
7121 * shape of the array.
7122 * This will always create an array with a type-0.90.0 superblock.
7123 * The newer usage is when assembling an array.
7124 * In this case raid_disks will be 0, and the major_version field is
7125 * use to determine which style super-blocks are to be found on the devices.
7126 * The minor and patch _version numbers are also kept incase the
7127 * super_block handler wishes to interpret them.
7129 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7131 if (info->raid_disks == 0) {
7132 /* just setting version number for superblock loading */
7133 if (info->major_version < 0 ||
7134 info->major_version >= ARRAY_SIZE(super_types) ||
7135 super_types[info->major_version].name == NULL) {
7136 /* maybe try to auto-load a module? */
7137 pr_warn("md: superblock version %d not known\n",
7138 info->major_version);
7141 mddev->major_version = info->major_version;
7142 mddev->minor_version = info->minor_version;
7143 mddev->patch_version = info->patch_version;
7144 mddev->persistent = !info->not_persistent;
7145 /* ensure mddev_put doesn't delete this now that there
7146 * is some minimal configuration.
7148 mddev->ctime = ktime_get_real_seconds();
7151 mddev->major_version = MD_MAJOR_VERSION;
7152 mddev->minor_version = MD_MINOR_VERSION;
7153 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7154 mddev->ctime = ktime_get_real_seconds();
7156 mddev->level = info->level;
7157 mddev->clevel[0] = 0;
7158 mddev->dev_sectors = 2 * (sector_t)info->size;
7159 mddev->raid_disks = info->raid_disks;
7160 /* don't set md_minor, it is determined by which /dev/md* was
7163 if (info->state & (1<<MD_SB_CLEAN))
7164 mddev->recovery_cp = MaxSector;
7166 mddev->recovery_cp = 0;
7167 mddev->persistent = ! info->not_persistent;
7168 mddev->external = 0;
7170 mddev->layout = info->layout;
7171 if (mddev->level == 0)
7172 /* Cannot trust RAID0 layout info here */
7174 mddev->chunk_sectors = info->chunk_size >> 9;
7176 if (mddev->persistent) {
7177 mddev->max_disks = MD_SB_DISKS;
7179 mddev->sb_flags = 0;
7181 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7183 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7184 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7185 mddev->bitmap_info.offset = 0;
7187 mddev->reshape_position = MaxSector;
7190 * Generate a 128 bit UUID
7192 get_random_bytes(mddev->uuid, 16);
7194 mddev->new_level = mddev->level;
7195 mddev->new_chunk_sectors = mddev->chunk_sectors;
7196 mddev->new_layout = mddev->layout;
7197 mddev->delta_disks = 0;
7198 mddev->reshape_backwards = 0;
7203 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7205 lockdep_assert_held(&mddev->reconfig_mutex);
7207 if (mddev->external_size)
7210 mddev->array_sectors = array_sectors;
7212 EXPORT_SYMBOL(md_set_array_sectors);
7214 static int update_size(struct mddev *mddev, sector_t num_sectors)
7216 struct md_rdev *rdev;
7218 int fit = (num_sectors == 0);
7219 sector_t old_dev_sectors = mddev->dev_sectors;
7221 if (mddev->pers->resize == NULL)
7223 /* The "num_sectors" is the number of sectors of each device that
7224 * is used. This can only make sense for arrays with redundancy.
7225 * linear and raid0 always use whatever space is available. We can only
7226 * consider changing this number if no resync or reconstruction is
7227 * happening, and if the new size is acceptable. It must fit before the
7228 * sb_start or, if that is <data_offset, it must fit before the size
7229 * of each device. If num_sectors is zero, we find the largest size
7232 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7238 rdev_for_each(rdev, mddev) {
7239 sector_t avail = rdev->sectors;
7241 if (fit && (num_sectors == 0 || num_sectors > avail))
7242 num_sectors = avail;
7243 if (avail < num_sectors)
7246 rv = mddev->pers->resize(mddev, num_sectors);
7248 if (mddev_is_clustered(mddev))
7249 md_cluster_ops->update_size(mddev, old_dev_sectors);
7250 else if (mddev->queue) {
7251 set_capacity_and_notify(mddev->gendisk,
7252 mddev->array_sectors);
7258 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7261 struct md_rdev *rdev;
7262 /* change the number of raid disks */
7263 if (mddev->pers->check_reshape == NULL)
7267 if (raid_disks <= 0 ||
7268 (mddev->max_disks && raid_disks >= mddev->max_disks))
7270 if (mddev->sync_thread ||
7271 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7272 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7273 mddev->reshape_position != MaxSector)
7276 rdev_for_each(rdev, mddev) {
7277 if (mddev->raid_disks < raid_disks &&
7278 rdev->data_offset < rdev->new_data_offset)
7280 if (mddev->raid_disks > raid_disks &&
7281 rdev->data_offset > rdev->new_data_offset)
7285 mddev->delta_disks = raid_disks - mddev->raid_disks;
7286 if (mddev->delta_disks < 0)
7287 mddev->reshape_backwards = 1;
7288 else if (mddev->delta_disks > 0)
7289 mddev->reshape_backwards = 0;
7291 rv = mddev->pers->check_reshape(mddev);
7293 mddev->delta_disks = 0;
7294 mddev->reshape_backwards = 0;
7300 * update_array_info is used to change the configuration of an
7302 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7303 * fields in the info are checked against the array.
7304 * Any differences that cannot be handled will cause an error.
7305 * Normally, only one change can be managed at a time.
7307 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7313 /* calculate expected state,ignoring low bits */
7314 if (mddev->bitmap && mddev->bitmap_info.offset)
7315 state |= (1 << MD_SB_BITMAP_PRESENT);
7317 if (mddev->major_version != info->major_version ||
7318 mddev->minor_version != info->minor_version ||
7319 /* mddev->patch_version != info->patch_version || */
7320 mddev->ctime != info->ctime ||
7321 mddev->level != info->level ||
7322 /* mddev->layout != info->layout || */
7323 mddev->persistent != !info->not_persistent ||
7324 mddev->chunk_sectors != info->chunk_size >> 9 ||
7325 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7326 ((state^info->state) & 0xfffffe00)
7329 /* Check there is only one change */
7330 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7332 if (mddev->raid_disks != info->raid_disks)
7334 if (mddev->layout != info->layout)
7336 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7343 if (mddev->layout != info->layout) {
7345 * we don't need to do anything at the md level, the
7346 * personality will take care of it all.
7348 if (mddev->pers->check_reshape == NULL)
7351 mddev->new_layout = info->layout;
7352 rv = mddev->pers->check_reshape(mddev);
7354 mddev->new_layout = mddev->layout;
7358 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7359 rv = update_size(mddev, (sector_t)info->size * 2);
7361 if (mddev->raid_disks != info->raid_disks)
7362 rv = update_raid_disks(mddev, info->raid_disks);
7364 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7365 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7369 if (mddev->recovery || mddev->sync_thread) {
7373 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7374 struct bitmap *bitmap;
7375 /* add the bitmap */
7376 if (mddev->bitmap) {
7380 if (mddev->bitmap_info.default_offset == 0) {
7384 mddev->bitmap_info.offset =
7385 mddev->bitmap_info.default_offset;
7386 mddev->bitmap_info.space =
7387 mddev->bitmap_info.default_space;
7388 bitmap = md_bitmap_create(mddev, -1);
7389 mddev_suspend(mddev);
7390 if (!IS_ERR(bitmap)) {
7391 mddev->bitmap = bitmap;
7392 rv = md_bitmap_load(mddev);
7394 rv = PTR_ERR(bitmap);
7396 md_bitmap_destroy(mddev);
7397 mddev_resume(mddev);
7399 /* remove the bitmap */
7400 if (!mddev->bitmap) {
7404 if (mddev->bitmap->storage.file) {
7408 if (mddev->bitmap_info.nodes) {
7409 /* hold PW on all the bitmap lock */
7410 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7411 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7413 md_cluster_ops->unlock_all_bitmaps(mddev);
7417 mddev->bitmap_info.nodes = 0;
7418 md_cluster_ops->leave(mddev);
7419 module_put(md_cluster_mod);
7420 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7422 mddev_suspend(mddev);
7423 md_bitmap_destroy(mddev);
7424 mddev_resume(mddev);
7425 mddev->bitmap_info.offset = 0;
7428 md_update_sb(mddev, 1);
7434 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7436 struct md_rdev *rdev;
7439 if (mddev->pers == NULL)
7443 rdev = md_find_rdev_rcu(mddev, dev);
7447 md_error(mddev, rdev);
7448 if (test_bit(MD_BROKEN, &mddev->flags))
7456 * We have a problem here : there is no easy way to give a CHS
7457 * virtual geometry. We currently pretend that we have a 2 heads
7458 * 4 sectors (with a BIG number of cylinders...). This drives
7459 * dosfs just mad... ;-)
7461 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7463 struct mddev *mddev = bdev->bd_disk->private_data;
7467 geo->cylinders = mddev->array_sectors / 8;
7471 static inline bool md_ioctl_valid(unsigned int cmd)
7475 case GET_ARRAY_INFO:
7476 case GET_BITMAP_FILE:
7479 case HOT_REMOVE_DISK:
7481 case RESTART_ARRAY_RW:
7483 case SET_ARRAY_INFO:
7484 case SET_BITMAP_FILE:
7485 case SET_DISK_FAULTY:
7488 case CLUSTERED_DISK_NACK:
7495 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7496 unsigned int cmd, unsigned long arg)
7499 void __user *argp = (void __user *)arg;
7500 struct mddev *mddev = NULL;
7501 bool did_set_md_closing = false;
7503 if (!md_ioctl_valid(cmd))
7508 case GET_ARRAY_INFO:
7512 if (!capable(CAP_SYS_ADMIN))
7517 * Commands dealing with the RAID driver but not any
7522 err = get_version(argp);
7528 * Commands creating/starting a new array:
7531 mddev = bdev->bd_disk->private_data;
7538 /* Some actions do not requires the mutex */
7540 case GET_ARRAY_INFO:
7541 if (!mddev->raid_disks && !mddev->external)
7544 err = get_array_info(mddev, argp);
7548 if (!mddev->raid_disks && !mddev->external)
7551 err = get_disk_info(mddev, argp);
7554 case SET_DISK_FAULTY:
7555 err = set_disk_faulty(mddev, new_decode_dev(arg));
7558 case GET_BITMAP_FILE:
7559 err = get_bitmap_file(mddev, argp);
7564 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7565 flush_rdev_wq(mddev);
7567 if (cmd == HOT_REMOVE_DISK)
7568 /* need to ensure recovery thread has run */
7569 wait_event_interruptible_timeout(mddev->sb_wait,
7570 !test_bit(MD_RECOVERY_NEEDED,
7572 msecs_to_jiffies(5000));
7573 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7574 /* Need to flush page cache, and ensure no-one else opens
7577 mutex_lock(&mddev->open_mutex);
7578 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7579 mutex_unlock(&mddev->open_mutex);
7583 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7584 mutex_unlock(&mddev->open_mutex);
7588 did_set_md_closing = true;
7589 mutex_unlock(&mddev->open_mutex);
7590 sync_blockdev(bdev);
7592 err = mddev_lock(mddev);
7594 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7599 if (cmd == SET_ARRAY_INFO) {
7600 mdu_array_info_t info;
7602 memset(&info, 0, sizeof(info));
7603 else if (copy_from_user(&info, argp, sizeof(info))) {
7608 err = update_array_info(mddev, &info);
7610 pr_warn("md: couldn't update array info. %d\n", err);
7615 if (!list_empty(&mddev->disks)) {
7616 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7620 if (mddev->raid_disks) {
7621 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7625 err = md_set_array_info(mddev, &info);
7627 pr_warn("md: couldn't set array info. %d\n", err);
7634 * Commands querying/configuring an existing array:
7636 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7637 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7638 if ((!mddev->raid_disks && !mddev->external)
7639 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7640 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7641 && cmd != GET_BITMAP_FILE) {
7647 * Commands even a read-only array can execute:
7650 case RESTART_ARRAY_RW:
7651 err = restart_array(mddev);
7655 err = do_md_stop(mddev, 0, bdev);
7659 err = md_set_readonly(mddev, bdev);
7662 case HOT_REMOVE_DISK:
7663 err = hot_remove_disk(mddev, new_decode_dev(arg));
7667 /* We can support ADD_NEW_DISK on read-only arrays
7668 * only if we are re-adding a preexisting device.
7669 * So require mddev->pers and MD_DISK_SYNC.
7672 mdu_disk_info_t info;
7673 if (copy_from_user(&info, argp, sizeof(info)))
7675 else if (!(info.state & (1<<MD_DISK_SYNC)))
7676 /* Need to clear read-only for this */
7679 err = md_add_new_disk(mddev, &info);
7686 * The remaining ioctls are changing the state of the
7687 * superblock, so we do not allow them on read-only arrays.
7689 if (mddev->ro && mddev->pers) {
7690 if (mddev->ro == 2) {
7692 sysfs_notify_dirent_safe(mddev->sysfs_state);
7693 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7694 /* mddev_unlock will wake thread */
7695 /* If a device failed while we were read-only, we
7696 * need to make sure the metadata is updated now.
7698 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7699 mddev_unlock(mddev);
7700 wait_event(mddev->sb_wait,
7701 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7702 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7703 mddev_lock_nointr(mddev);
7714 mdu_disk_info_t info;
7715 if (copy_from_user(&info, argp, sizeof(info)))
7718 err = md_add_new_disk(mddev, &info);
7722 case CLUSTERED_DISK_NACK:
7723 if (mddev_is_clustered(mddev))
7724 md_cluster_ops->new_disk_ack(mddev, false);
7730 err = hot_add_disk(mddev, new_decode_dev(arg));
7734 err = do_md_run(mddev);
7737 case SET_BITMAP_FILE:
7738 err = set_bitmap_file(mddev, (int)arg);
7747 if (mddev->hold_active == UNTIL_IOCTL &&
7749 mddev->hold_active = 0;
7750 mddev_unlock(mddev);
7752 if(did_set_md_closing)
7753 clear_bit(MD_CLOSING, &mddev->flags);
7756 #ifdef CONFIG_COMPAT
7757 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7758 unsigned int cmd, unsigned long arg)
7761 case HOT_REMOVE_DISK:
7763 case SET_DISK_FAULTY:
7764 case SET_BITMAP_FILE:
7765 /* These take in integer arg, do not convert */
7768 arg = (unsigned long)compat_ptr(arg);
7772 return md_ioctl(bdev, mode, cmd, arg);
7774 #endif /* CONFIG_COMPAT */
7776 static int md_set_read_only(struct block_device *bdev, bool ro)
7778 struct mddev *mddev = bdev->bd_disk->private_data;
7781 err = mddev_lock(mddev);
7785 if (!mddev->raid_disks && !mddev->external) {
7791 * Transitioning to read-auto need only happen for arrays that call
7792 * md_write_start and which are not ready for writes yet.
7794 if (!ro && mddev->ro == 1 && mddev->pers) {
7795 err = restart_array(mddev);
7802 mddev_unlock(mddev);
7806 static int md_open(struct block_device *bdev, fmode_t mode)
7809 * Succeed if we can lock the mddev, which confirms that
7810 * it isn't being stopped right now.
7812 struct mddev *mddev = mddev_find(bdev->bd_dev);
7818 if (mddev->gendisk != bdev->bd_disk) {
7819 /* we are racing with mddev_put which is discarding this
7823 /* Wait until bdev->bd_disk is definitely gone */
7824 if (work_pending(&mddev->del_work))
7825 flush_workqueue(md_misc_wq);
7828 BUG_ON(mddev != bdev->bd_disk->private_data);
7830 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7833 if (test_bit(MD_CLOSING, &mddev->flags)) {
7834 mutex_unlock(&mddev->open_mutex);
7840 atomic_inc(&mddev->openers);
7841 mutex_unlock(&mddev->open_mutex);
7843 bdev_check_media_change(bdev);
7850 static void md_release(struct gendisk *disk, fmode_t mode)
7852 struct mddev *mddev = disk->private_data;
7855 atomic_dec(&mddev->openers);
7859 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7861 struct mddev *mddev = disk->private_data;
7862 unsigned int ret = 0;
7865 ret = DISK_EVENT_MEDIA_CHANGE;
7870 const struct block_device_operations md_fops =
7872 .owner = THIS_MODULE,
7873 .submit_bio = md_submit_bio,
7875 .release = md_release,
7877 #ifdef CONFIG_COMPAT
7878 .compat_ioctl = md_compat_ioctl,
7880 .getgeo = md_getgeo,
7881 .check_events = md_check_events,
7882 .set_read_only = md_set_read_only,
7885 static int md_thread(void *arg)
7887 struct md_thread *thread = arg;
7890 * md_thread is a 'system-thread', it's priority should be very
7891 * high. We avoid resource deadlocks individually in each
7892 * raid personality. (RAID5 does preallocation) We also use RR and
7893 * the very same RT priority as kswapd, thus we will never get
7894 * into a priority inversion deadlock.
7896 * we definitely have to have equal or higher priority than
7897 * bdflush, otherwise bdflush will deadlock if there are too
7898 * many dirty RAID5 blocks.
7901 allow_signal(SIGKILL);
7902 while (!kthread_should_stop()) {
7904 /* We need to wait INTERRUPTIBLE so that
7905 * we don't add to the load-average.
7906 * That means we need to be sure no signals are
7909 if (signal_pending(current))
7910 flush_signals(current);
7912 wait_event_interruptible_timeout
7914 test_bit(THREAD_WAKEUP, &thread->flags)
7915 || kthread_should_stop() || kthread_should_park(),
7918 clear_bit(THREAD_WAKEUP, &thread->flags);
7919 if (kthread_should_park())
7921 if (!kthread_should_stop())
7922 thread->run(thread);
7928 void md_wakeup_thread(struct md_thread *thread)
7931 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7932 set_bit(THREAD_WAKEUP, &thread->flags);
7933 wake_up(&thread->wqueue);
7936 EXPORT_SYMBOL(md_wakeup_thread);
7938 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7939 struct mddev *mddev, const char *name)
7941 struct md_thread *thread;
7943 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7947 init_waitqueue_head(&thread->wqueue);
7950 thread->mddev = mddev;
7951 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7952 thread->tsk = kthread_run(md_thread, thread,
7954 mdname(thread->mddev),
7956 if (IS_ERR(thread->tsk)) {
7962 EXPORT_SYMBOL(md_register_thread);
7964 void md_unregister_thread(struct md_thread **threadp)
7966 struct md_thread *thread = *threadp;
7969 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7970 /* Locking ensures that mddev_unlock does not wake_up a
7971 * non-existent thread
7973 spin_lock(&pers_lock);
7975 spin_unlock(&pers_lock);
7977 kthread_stop(thread->tsk);
7980 EXPORT_SYMBOL(md_unregister_thread);
7982 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7984 if (!rdev || test_bit(Faulty, &rdev->flags))
7987 if (!mddev->pers || !mddev->pers->error_handler)
7989 mddev->pers->error_handler(mddev, rdev);
7991 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
7992 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7993 sysfs_notify_dirent_safe(rdev->sysfs_state);
7994 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7995 if (!test_bit(MD_BROKEN, &mddev->flags)) {
7996 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7997 md_wakeup_thread(mddev->thread);
7999 if (mddev->event_work.func)
8000 queue_work(md_misc_wq, &mddev->event_work);
8003 EXPORT_SYMBOL(md_error);
8005 /* seq_file implementation /proc/mdstat */
8007 static void status_unused(struct seq_file *seq)
8010 struct md_rdev *rdev;
8012 seq_printf(seq, "unused devices: ");
8014 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8015 char b[BDEVNAME_SIZE];
8017 seq_printf(seq, "%s ",
8018 bdevname(rdev->bdev,b));
8021 seq_printf(seq, "<none>");
8023 seq_printf(seq, "\n");
8026 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8028 sector_t max_sectors, resync, res;
8029 unsigned long dt, db = 0;
8030 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8031 int scale, recovery_active;
8032 unsigned int per_milli;
8034 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8035 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8036 max_sectors = mddev->resync_max_sectors;
8038 max_sectors = mddev->dev_sectors;
8040 resync = mddev->curr_resync;
8042 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8043 /* Still cleaning up */
8044 resync = max_sectors;
8045 } else if (resync > max_sectors)
8046 resync = max_sectors;
8048 resync -= atomic_read(&mddev->recovery_active);
8051 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8052 struct md_rdev *rdev;
8054 rdev_for_each(rdev, mddev)
8055 if (rdev->raid_disk >= 0 &&
8056 !test_bit(Faulty, &rdev->flags) &&
8057 rdev->recovery_offset != MaxSector &&
8058 rdev->recovery_offset) {
8059 seq_printf(seq, "\trecover=REMOTE");
8062 if (mddev->reshape_position != MaxSector)
8063 seq_printf(seq, "\treshape=REMOTE");
8065 seq_printf(seq, "\tresync=REMOTE");
8068 if (mddev->recovery_cp < MaxSector) {
8069 seq_printf(seq, "\tresync=PENDING");
8075 seq_printf(seq, "\tresync=DELAYED");
8079 WARN_ON(max_sectors == 0);
8080 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8081 * in a sector_t, and (max_sectors>>scale) will fit in a
8082 * u32, as those are the requirements for sector_div.
8083 * Thus 'scale' must be at least 10
8086 if (sizeof(sector_t) > sizeof(unsigned long)) {
8087 while ( max_sectors/2 > (1ULL<<(scale+32)))
8090 res = (resync>>scale)*1000;
8091 sector_div(res, (u32)((max_sectors>>scale)+1));
8095 int i, x = per_milli/50, y = 20-x;
8096 seq_printf(seq, "[");
8097 for (i = 0; i < x; i++)
8098 seq_printf(seq, "=");
8099 seq_printf(seq, ">");
8100 for (i = 0; i < y; i++)
8101 seq_printf(seq, ".");
8102 seq_printf(seq, "] ");
8104 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8105 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8107 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8109 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8110 "resync" : "recovery"))),
8111 per_milli/10, per_milli % 10,
8112 (unsigned long long) resync/2,
8113 (unsigned long long) max_sectors/2);
8116 * dt: time from mark until now
8117 * db: blocks written from mark until now
8118 * rt: remaining time
8120 * rt is a sector_t, which is always 64bit now. We are keeping
8121 * the original algorithm, but it is not really necessary.
8123 * Original algorithm:
8124 * So we divide before multiply in case it is 32bit and close
8126 * We scale the divisor (db) by 32 to avoid losing precision
8127 * near the end of resync when the number of remaining sectors
8129 * We then divide rt by 32 after multiplying by db to compensate.
8130 * The '+1' avoids division by zero if db is very small.
8132 dt = ((jiffies - mddev->resync_mark) / HZ);
8135 curr_mark_cnt = mddev->curr_mark_cnt;
8136 recovery_active = atomic_read(&mddev->recovery_active);
8137 resync_mark_cnt = mddev->resync_mark_cnt;
8139 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8140 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8142 rt = max_sectors - resync; /* number of remaining sectors */
8143 rt = div64_u64(rt, db/32+1);
8147 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8148 ((unsigned long)rt % 60)/6);
8150 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8154 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8156 struct list_head *tmp;
8158 struct mddev *mddev;
8170 spin_lock(&all_mddevs_lock);
8171 list_for_each(tmp,&all_mddevs)
8173 mddev = list_entry(tmp, struct mddev, all_mddevs);
8175 spin_unlock(&all_mddevs_lock);
8178 spin_unlock(&all_mddevs_lock);
8180 return (void*)2;/* tail */
8184 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8186 struct list_head *tmp;
8187 struct mddev *next_mddev, *mddev = v;
8193 spin_lock(&all_mddevs_lock);
8195 tmp = all_mddevs.next;
8197 tmp = mddev->all_mddevs.next;
8198 if (tmp != &all_mddevs)
8199 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8201 next_mddev = (void*)2;
8204 spin_unlock(&all_mddevs_lock);
8212 static void md_seq_stop(struct seq_file *seq, void *v)
8214 struct mddev *mddev = v;
8216 if (mddev && v != (void*)1 && v != (void*)2)
8220 static int md_seq_show(struct seq_file *seq, void *v)
8222 struct mddev *mddev = v;
8224 struct md_rdev *rdev;
8226 if (v == (void*)1) {
8227 struct md_personality *pers;
8228 seq_printf(seq, "Personalities : ");
8229 spin_lock(&pers_lock);
8230 list_for_each_entry(pers, &pers_list, list)
8231 seq_printf(seq, "[%s] ", pers->name);
8233 spin_unlock(&pers_lock);
8234 seq_printf(seq, "\n");
8235 seq->poll_event = atomic_read(&md_event_count);
8238 if (v == (void*)2) {
8243 spin_lock(&mddev->lock);
8244 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8245 seq_printf(seq, "%s : %sactive", mdname(mddev),
8246 mddev->pers ? "" : "in");
8249 seq_printf(seq, " (read-only)");
8251 seq_printf(seq, " (auto-read-only)");
8252 seq_printf(seq, " %s", mddev->pers->name);
8257 rdev_for_each_rcu(rdev, mddev) {
8258 char b[BDEVNAME_SIZE];
8259 seq_printf(seq, " %s[%d]",
8260 bdevname(rdev->bdev,b), rdev->desc_nr);
8261 if (test_bit(WriteMostly, &rdev->flags))
8262 seq_printf(seq, "(W)");
8263 if (test_bit(Journal, &rdev->flags))
8264 seq_printf(seq, "(J)");
8265 if (test_bit(Faulty, &rdev->flags)) {
8266 seq_printf(seq, "(F)");
8269 if (rdev->raid_disk < 0)
8270 seq_printf(seq, "(S)"); /* spare */
8271 if (test_bit(Replacement, &rdev->flags))
8272 seq_printf(seq, "(R)");
8273 sectors += rdev->sectors;
8277 if (!list_empty(&mddev->disks)) {
8279 seq_printf(seq, "\n %llu blocks",
8280 (unsigned long long)
8281 mddev->array_sectors / 2);
8283 seq_printf(seq, "\n %llu blocks",
8284 (unsigned long long)sectors / 2);
8286 if (mddev->persistent) {
8287 if (mddev->major_version != 0 ||
8288 mddev->minor_version != 90) {
8289 seq_printf(seq," super %d.%d",
8290 mddev->major_version,
8291 mddev->minor_version);
8293 } else if (mddev->external)
8294 seq_printf(seq, " super external:%s",
8295 mddev->metadata_type);
8297 seq_printf(seq, " super non-persistent");
8300 mddev->pers->status(seq, mddev);
8301 seq_printf(seq, "\n ");
8302 if (mddev->pers->sync_request) {
8303 if (status_resync(seq, mddev))
8304 seq_printf(seq, "\n ");
8307 seq_printf(seq, "\n ");
8309 md_bitmap_status(seq, mddev->bitmap);
8311 seq_printf(seq, "\n");
8313 spin_unlock(&mddev->lock);
8318 static const struct seq_operations md_seq_ops = {
8319 .start = md_seq_start,
8320 .next = md_seq_next,
8321 .stop = md_seq_stop,
8322 .show = md_seq_show,
8325 static int md_seq_open(struct inode *inode, struct file *file)
8327 struct seq_file *seq;
8330 error = seq_open(file, &md_seq_ops);
8334 seq = file->private_data;
8335 seq->poll_event = atomic_read(&md_event_count);
8339 static int md_unloading;
8340 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8342 struct seq_file *seq = filp->private_data;
8346 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8347 poll_wait(filp, &md_event_waiters, wait);
8349 /* always allow read */
8350 mask = EPOLLIN | EPOLLRDNORM;
8352 if (seq->poll_event != atomic_read(&md_event_count))
8353 mask |= EPOLLERR | EPOLLPRI;
8357 static const struct proc_ops mdstat_proc_ops = {
8358 .proc_open = md_seq_open,
8359 .proc_read = seq_read,
8360 .proc_lseek = seq_lseek,
8361 .proc_release = seq_release,
8362 .proc_poll = mdstat_poll,
8365 int register_md_personality(struct md_personality *p)
8367 pr_debug("md: %s personality registered for level %d\n",
8369 spin_lock(&pers_lock);
8370 list_add_tail(&p->list, &pers_list);
8371 spin_unlock(&pers_lock);
8374 EXPORT_SYMBOL(register_md_personality);
8376 int unregister_md_personality(struct md_personality *p)
8378 pr_debug("md: %s personality unregistered\n", p->name);
8379 spin_lock(&pers_lock);
8380 list_del_init(&p->list);
8381 spin_unlock(&pers_lock);
8384 EXPORT_SYMBOL(unregister_md_personality);
8386 int register_md_cluster_operations(struct md_cluster_operations *ops,
8387 struct module *module)
8390 spin_lock(&pers_lock);
8391 if (md_cluster_ops != NULL)
8394 md_cluster_ops = ops;
8395 md_cluster_mod = module;
8397 spin_unlock(&pers_lock);
8400 EXPORT_SYMBOL(register_md_cluster_operations);
8402 int unregister_md_cluster_operations(void)
8404 spin_lock(&pers_lock);
8405 md_cluster_ops = NULL;
8406 spin_unlock(&pers_lock);
8409 EXPORT_SYMBOL(unregister_md_cluster_operations);
8411 int md_setup_cluster(struct mddev *mddev, int nodes)
8414 if (!md_cluster_ops)
8415 request_module("md-cluster");
8416 spin_lock(&pers_lock);
8417 /* ensure module won't be unloaded */
8418 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8419 pr_warn("can't find md-cluster module or get its reference.\n");
8420 spin_unlock(&pers_lock);
8423 spin_unlock(&pers_lock);
8425 ret = md_cluster_ops->join(mddev, nodes);
8427 mddev->safemode_delay = 0;
8431 void md_cluster_stop(struct mddev *mddev)
8433 if (!md_cluster_ops)
8435 md_cluster_ops->leave(mddev);
8436 module_put(md_cluster_mod);
8439 static int is_mddev_idle(struct mddev *mddev, int init)
8441 struct md_rdev *rdev;
8447 rdev_for_each_rcu(rdev, mddev) {
8448 struct gendisk *disk = rdev->bdev->bd_disk;
8449 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8450 atomic_read(&disk->sync_io);
8451 /* sync IO will cause sync_io to increase before the disk_stats
8452 * as sync_io is counted when a request starts, and
8453 * disk_stats is counted when it completes.
8454 * So resync activity will cause curr_events to be smaller than
8455 * when there was no such activity.
8456 * non-sync IO will cause disk_stat to increase without
8457 * increasing sync_io so curr_events will (eventually)
8458 * be larger than it was before. Once it becomes
8459 * substantially larger, the test below will cause
8460 * the array to appear non-idle, and resync will slow
8462 * If there is a lot of outstanding resync activity when
8463 * we set last_event to curr_events, then all that activity
8464 * completing might cause the array to appear non-idle
8465 * and resync will be slowed down even though there might
8466 * not have been non-resync activity. This will only
8467 * happen once though. 'last_events' will soon reflect
8468 * the state where there is little or no outstanding
8469 * resync requests, and further resync activity will
8470 * always make curr_events less than last_events.
8473 if (init || curr_events - rdev->last_events > 64) {
8474 rdev->last_events = curr_events;
8482 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8484 /* another "blocks" (512byte) blocks have been synced */
8485 atomic_sub(blocks, &mddev->recovery_active);
8486 wake_up(&mddev->recovery_wait);
8488 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8489 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8490 md_wakeup_thread(mddev->thread);
8491 // stop recovery, signal do_sync ....
8494 EXPORT_SYMBOL(md_done_sync);
8496 /* md_write_start(mddev, bi)
8497 * If we need to update some array metadata (e.g. 'active' flag
8498 * in superblock) before writing, schedule a superblock update
8499 * and wait for it to complete.
8500 * A return value of 'false' means that the write wasn't recorded
8501 * and cannot proceed as the array is being suspend.
8503 bool md_write_start(struct mddev *mddev, struct bio *bi)
8507 if (bio_data_dir(bi) != WRITE)
8510 BUG_ON(mddev->ro == 1);
8511 if (mddev->ro == 2) {
8512 /* need to switch to read/write */
8514 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8515 md_wakeup_thread(mddev->thread);
8516 md_wakeup_thread(mddev->sync_thread);
8520 percpu_ref_get(&mddev->writes_pending);
8521 smp_mb(); /* Match smp_mb in set_in_sync() */
8522 if (mddev->safemode == 1)
8523 mddev->safemode = 0;
8524 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8525 if (mddev->in_sync || mddev->sync_checkers) {
8526 spin_lock(&mddev->lock);
8527 if (mddev->in_sync) {
8529 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8530 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8531 md_wakeup_thread(mddev->thread);
8534 spin_unlock(&mddev->lock);
8538 sysfs_notify_dirent_safe(mddev->sysfs_state);
8539 if (!mddev->has_superblocks)
8541 wait_event(mddev->sb_wait,
8542 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8544 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8545 percpu_ref_put(&mddev->writes_pending);
8550 EXPORT_SYMBOL(md_write_start);
8552 /* md_write_inc can only be called when md_write_start() has
8553 * already been called at least once of the current request.
8554 * It increments the counter and is useful when a single request
8555 * is split into several parts. Each part causes an increment and
8556 * so needs a matching md_write_end().
8557 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8558 * a spinlocked region.
8560 void md_write_inc(struct mddev *mddev, struct bio *bi)
8562 if (bio_data_dir(bi) != WRITE)
8564 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8565 percpu_ref_get(&mddev->writes_pending);
8567 EXPORT_SYMBOL(md_write_inc);
8569 void md_write_end(struct mddev *mddev)
8571 percpu_ref_put(&mddev->writes_pending);
8573 if (mddev->safemode == 2)
8574 md_wakeup_thread(mddev->thread);
8575 else if (mddev->safemode_delay)
8576 /* The roundup() ensures this only performs locking once
8577 * every ->safemode_delay jiffies
8579 mod_timer(&mddev->safemode_timer,
8580 roundup(jiffies, mddev->safemode_delay) +
8581 mddev->safemode_delay);
8584 EXPORT_SYMBOL(md_write_end);
8586 /* This is used by raid0 and raid10 */
8587 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8588 struct bio *bio, sector_t start, sector_t size)
8590 struct bio *discard_bio = NULL;
8592 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8593 &discard_bio) || !discard_bio)
8596 bio_chain(discard_bio, bio);
8597 bio_clone_blkg_association(discard_bio, bio);
8599 trace_block_bio_remap(discard_bio,
8600 disk_devt(mddev->gendisk),
8601 bio->bi_iter.bi_sector);
8602 submit_bio_noacct(discard_bio);
8604 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8606 int acct_bioset_init(struct mddev *mddev)
8610 if (!bioset_initialized(&mddev->io_acct_set))
8611 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
8612 offsetof(struct md_io_acct, bio_clone), 0);
8615 EXPORT_SYMBOL_GPL(acct_bioset_init);
8617 void acct_bioset_exit(struct mddev *mddev)
8619 bioset_exit(&mddev->io_acct_set);
8621 EXPORT_SYMBOL_GPL(acct_bioset_exit);
8623 static void md_end_io_acct(struct bio *bio)
8625 struct md_io_acct *md_io_acct = bio->bi_private;
8626 struct bio *orig_bio = md_io_acct->orig_bio;
8628 orig_bio->bi_status = bio->bi_status;
8630 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8632 bio_endio(orig_bio);
8636 * Used by personalities that don't already clone the bio and thus can't
8637 * easily add the timestamp to their extended bio structure.
8639 void md_account_bio(struct mddev *mddev, struct bio **bio)
8641 struct block_device *bdev = (*bio)->bi_bdev;
8642 struct md_io_acct *md_io_acct;
8645 if (!blk_queue_io_stat(bdev->bd_disk->queue))
8648 clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set);
8649 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8650 md_io_acct->orig_bio = *bio;
8651 md_io_acct->start_time = bio_start_io_acct(*bio);
8653 clone->bi_end_io = md_end_io_acct;
8654 clone->bi_private = md_io_acct;
8657 EXPORT_SYMBOL_GPL(md_account_bio);
8659 /* md_allow_write(mddev)
8660 * Calling this ensures that the array is marked 'active' so that writes
8661 * may proceed without blocking. It is important to call this before
8662 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8663 * Must be called with mddev_lock held.
8665 void md_allow_write(struct mddev *mddev)
8671 if (!mddev->pers->sync_request)
8674 spin_lock(&mddev->lock);
8675 if (mddev->in_sync) {
8677 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8678 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8679 if (mddev->safemode_delay &&
8680 mddev->safemode == 0)
8681 mddev->safemode = 1;
8682 spin_unlock(&mddev->lock);
8683 md_update_sb(mddev, 0);
8684 sysfs_notify_dirent_safe(mddev->sysfs_state);
8685 /* wait for the dirty state to be recorded in the metadata */
8686 wait_event(mddev->sb_wait,
8687 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8689 spin_unlock(&mddev->lock);
8691 EXPORT_SYMBOL_GPL(md_allow_write);
8693 #define SYNC_MARKS 10
8694 #define SYNC_MARK_STEP (3*HZ)
8695 #define UPDATE_FREQUENCY (5*60*HZ)
8696 void md_do_sync(struct md_thread *thread)
8698 struct mddev *mddev = thread->mddev;
8699 struct mddev *mddev2;
8700 unsigned int currspeed = 0, window;
8701 sector_t max_sectors,j, io_sectors, recovery_done;
8702 unsigned long mark[SYNC_MARKS];
8703 unsigned long update_time;
8704 sector_t mark_cnt[SYNC_MARKS];
8706 struct list_head *tmp;
8707 sector_t last_check;
8709 struct md_rdev *rdev;
8710 char *desc, *action = NULL;
8711 struct blk_plug plug;
8714 /* just incase thread restarts... */
8715 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8716 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8718 if (mddev->ro) {/* never try to sync a read-only array */
8719 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8723 if (mddev_is_clustered(mddev)) {
8724 ret = md_cluster_ops->resync_start(mddev);
8728 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8729 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8730 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8731 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8732 && ((unsigned long long)mddev->curr_resync_completed
8733 < (unsigned long long)mddev->resync_max_sectors))
8737 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8738 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8739 desc = "data-check";
8741 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8742 desc = "requested-resync";
8746 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8751 mddev->last_sync_action = action ?: desc;
8753 /* we overload curr_resync somewhat here.
8754 * 0 == not engaged in resync at all
8755 * 2 == checking that there is no conflict with another sync
8756 * 1 == like 2, but have yielded to allow conflicting resync to
8758 * other == active in resync - this many blocks
8760 * Before starting a resync we must have set curr_resync to
8761 * 2, and then checked that every "conflicting" array has curr_resync
8762 * less than ours. When we find one that is the same or higher
8763 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8764 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8765 * This will mean we have to start checking from the beginning again.
8770 int mddev2_minor = -1;
8771 mddev->curr_resync = 2;
8774 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8776 for_each_mddev(mddev2, tmp) {
8777 if (mddev2 == mddev)
8779 if (!mddev->parallel_resync
8780 && mddev2->curr_resync
8781 && match_mddev_units(mddev, mddev2)) {
8783 if (mddev < mddev2 && mddev->curr_resync == 2) {
8784 /* arbitrarily yield */
8785 mddev->curr_resync = 1;
8786 wake_up(&resync_wait);
8788 if (mddev > mddev2 && mddev->curr_resync == 1)
8789 /* no need to wait here, we can wait the next
8790 * time 'round when curr_resync == 2
8793 /* We need to wait 'interruptible' so as not to
8794 * contribute to the load average, and not to
8795 * be caught by 'softlockup'
8797 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8798 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8799 mddev2->curr_resync >= mddev->curr_resync) {
8800 if (mddev2_minor != mddev2->md_minor) {
8801 mddev2_minor = mddev2->md_minor;
8802 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8803 desc, mdname(mddev),
8807 if (signal_pending(current))
8808 flush_signals(current);
8810 finish_wait(&resync_wait, &wq);
8813 finish_wait(&resync_wait, &wq);
8816 } while (mddev->curr_resync < 2);
8819 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8820 /* resync follows the size requested by the personality,
8821 * which defaults to physical size, but can be virtual size
8823 max_sectors = mddev->resync_max_sectors;
8824 atomic64_set(&mddev->resync_mismatches, 0);
8825 /* we don't use the checkpoint if there's a bitmap */
8826 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8827 j = mddev->resync_min;
8828 else if (!mddev->bitmap)
8829 j = mddev->recovery_cp;
8831 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8832 max_sectors = mddev->resync_max_sectors;
8834 * If the original node aborts reshaping then we continue the
8835 * reshaping, so set j again to avoid restart reshape from the
8838 if (mddev_is_clustered(mddev) &&
8839 mddev->reshape_position != MaxSector)
8840 j = mddev->reshape_position;
8842 /* recovery follows the physical size of devices */
8843 max_sectors = mddev->dev_sectors;
8846 rdev_for_each_rcu(rdev, mddev)
8847 if (rdev->raid_disk >= 0 &&
8848 !test_bit(Journal, &rdev->flags) &&
8849 !test_bit(Faulty, &rdev->flags) &&
8850 !test_bit(In_sync, &rdev->flags) &&
8851 rdev->recovery_offset < j)
8852 j = rdev->recovery_offset;
8855 /* If there is a bitmap, we need to make sure all
8856 * writes that started before we added a spare
8857 * complete before we start doing a recovery.
8858 * Otherwise the write might complete and (via
8859 * bitmap_endwrite) set a bit in the bitmap after the
8860 * recovery has checked that bit and skipped that
8863 if (mddev->bitmap) {
8864 mddev->pers->quiesce(mddev, 1);
8865 mddev->pers->quiesce(mddev, 0);
8869 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8870 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8871 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8872 speed_max(mddev), desc);
8874 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8877 for (m = 0; m < SYNC_MARKS; m++) {
8879 mark_cnt[m] = io_sectors;
8882 mddev->resync_mark = mark[last_mark];
8883 mddev->resync_mark_cnt = mark_cnt[last_mark];
8886 * Tune reconstruction:
8888 window = 32 * (PAGE_SIZE / 512);
8889 pr_debug("md: using %dk window, over a total of %lluk.\n",
8890 window/2, (unsigned long long)max_sectors/2);
8892 atomic_set(&mddev->recovery_active, 0);
8896 pr_debug("md: resuming %s of %s from checkpoint.\n",
8897 desc, mdname(mddev));
8898 mddev->curr_resync = j;
8900 mddev->curr_resync = 3; /* no longer delayed */
8901 mddev->curr_resync_completed = j;
8902 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8904 update_time = jiffies;
8906 blk_start_plug(&plug);
8907 while (j < max_sectors) {
8912 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8913 ((mddev->curr_resync > mddev->curr_resync_completed &&
8914 (mddev->curr_resync - mddev->curr_resync_completed)
8915 > (max_sectors >> 4)) ||
8916 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8917 (j - mddev->curr_resync_completed)*2
8918 >= mddev->resync_max - mddev->curr_resync_completed ||
8919 mddev->curr_resync_completed > mddev->resync_max
8921 /* time to update curr_resync_completed */
8922 wait_event(mddev->recovery_wait,
8923 atomic_read(&mddev->recovery_active) == 0);
8924 mddev->curr_resync_completed = j;
8925 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8926 j > mddev->recovery_cp)
8927 mddev->recovery_cp = j;
8928 update_time = jiffies;
8929 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8930 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8933 while (j >= mddev->resync_max &&
8934 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8935 /* As this condition is controlled by user-space,
8936 * we can block indefinitely, so use '_interruptible'
8937 * to avoid triggering warnings.
8939 flush_signals(current); /* just in case */
8940 wait_event_interruptible(mddev->recovery_wait,
8941 mddev->resync_max > j
8942 || test_bit(MD_RECOVERY_INTR,
8946 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8949 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8951 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8955 if (!skipped) { /* actual IO requested */
8956 io_sectors += sectors;
8957 atomic_add(sectors, &mddev->recovery_active);
8960 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8964 if (j > max_sectors)
8965 /* when skipping, extra large numbers can be returned. */
8968 mddev->curr_resync = j;
8969 mddev->curr_mark_cnt = io_sectors;
8970 if (last_check == 0)
8971 /* this is the earliest that rebuild will be
8972 * visible in /proc/mdstat
8976 if (last_check + window > io_sectors || j == max_sectors)
8979 last_check = io_sectors;
8981 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8983 int next = (last_mark+1) % SYNC_MARKS;
8985 mddev->resync_mark = mark[next];
8986 mddev->resync_mark_cnt = mark_cnt[next];
8987 mark[next] = jiffies;
8988 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8992 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8996 * this loop exits only if either when we are slower than
8997 * the 'hard' speed limit, or the system was IO-idle for
8999 * the system might be non-idle CPU-wise, but we only care
9000 * about not overloading the IO subsystem. (things like an
9001 * e2fsck being done on the RAID array should execute fast)
9005 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9006 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9007 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9009 if (currspeed > speed_min(mddev)) {
9010 if (currspeed > speed_max(mddev)) {
9014 if (!is_mddev_idle(mddev, 0)) {
9016 * Give other IO more of a chance.
9017 * The faster the devices, the less we wait.
9019 wait_event(mddev->recovery_wait,
9020 !atomic_read(&mddev->recovery_active));
9024 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9025 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9026 ? "interrupted" : "done");
9028 * this also signals 'finished resyncing' to md_stop
9030 blk_finish_plug(&plug);
9031 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9033 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9034 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9035 mddev->curr_resync > 3) {
9036 mddev->curr_resync_completed = mddev->curr_resync;
9037 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9039 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9041 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9042 mddev->curr_resync > 3) {
9043 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9044 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9045 if (mddev->curr_resync >= mddev->recovery_cp) {
9046 pr_debug("md: checkpointing %s of %s.\n",
9047 desc, mdname(mddev));
9048 if (test_bit(MD_RECOVERY_ERROR,
9050 mddev->recovery_cp =
9051 mddev->curr_resync_completed;
9053 mddev->recovery_cp =
9057 mddev->recovery_cp = MaxSector;
9059 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9060 mddev->curr_resync = MaxSector;
9061 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9062 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9064 rdev_for_each_rcu(rdev, mddev)
9065 if (rdev->raid_disk >= 0 &&
9066 mddev->delta_disks >= 0 &&
9067 !test_bit(Journal, &rdev->flags) &&
9068 !test_bit(Faulty, &rdev->flags) &&
9069 !test_bit(In_sync, &rdev->flags) &&
9070 rdev->recovery_offset < mddev->curr_resync)
9071 rdev->recovery_offset = mddev->curr_resync;
9077 /* set CHANGE_PENDING here since maybe another update is needed,
9078 * so other nodes are informed. It should be harmless for normal
9080 set_mask_bits(&mddev->sb_flags, 0,
9081 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9083 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9084 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9085 mddev->delta_disks > 0 &&
9086 mddev->pers->finish_reshape &&
9087 mddev->pers->size &&
9089 mddev_lock_nointr(mddev);
9090 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9091 mddev_unlock(mddev);
9092 if (!mddev_is_clustered(mddev))
9093 set_capacity_and_notify(mddev->gendisk,
9094 mddev->array_sectors);
9097 spin_lock(&mddev->lock);
9098 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9099 /* We completed so min/max setting can be forgotten if used. */
9100 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9101 mddev->resync_min = 0;
9102 mddev->resync_max = MaxSector;
9103 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9104 mddev->resync_min = mddev->curr_resync_completed;
9105 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9106 mddev->curr_resync = 0;
9107 spin_unlock(&mddev->lock);
9109 wake_up(&resync_wait);
9110 md_wakeup_thread(mddev->thread);
9113 EXPORT_SYMBOL_GPL(md_do_sync);
9115 static int remove_and_add_spares(struct mddev *mddev,
9116 struct md_rdev *this)
9118 struct md_rdev *rdev;
9121 bool remove_some = false;
9123 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9124 /* Mustn't remove devices when resync thread is running */
9127 rdev_for_each(rdev, mddev) {
9128 if ((this == NULL || rdev == this) &&
9129 rdev->raid_disk >= 0 &&
9130 !test_bit(Blocked, &rdev->flags) &&
9131 test_bit(Faulty, &rdev->flags) &&
9132 atomic_read(&rdev->nr_pending)==0) {
9133 /* Faulty non-Blocked devices with nr_pending == 0
9134 * never get nr_pending incremented,
9135 * never get Faulty cleared, and never get Blocked set.
9136 * So we can synchronize_rcu now rather than once per device
9139 set_bit(RemoveSynchronized, &rdev->flags);
9145 rdev_for_each(rdev, mddev) {
9146 if ((this == NULL || rdev == this) &&
9147 rdev->raid_disk >= 0 &&
9148 !test_bit(Blocked, &rdev->flags) &&
9149 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9150 (!test_bit(In_sync, &rdev->flags) &&
9151 !test_bit(Journal, &rdev->flags))) &&
9152 atomic_read(&rdev->nr_pending)==0)) {
9153 if (mddev->pers->hot_remove_disk(
9154 mddev, rdev) == 0) {
9155 sysfs_unlink_rdev(mddev, rdev);
9156 rdev->saved_raid_disk = rdev->raid_disk;
9157 rdev->raid_disk = -1;
9161 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9162 clear_bit(RemoveSynchronized, &rdev->flags);
9165 if (removed && mddev->kobj.sd)
9166 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9168 if (this && removed)
9171 rdev_for_each(rdev, mddev) {
9172 if (this && this != rdev)
9174 if (test_bit(Candidate, &rdev->flags))
9176 if (rdev->raid_disk >= 0 &&
9177 !test_bit(In_sync, &rdev->flags) &&
9178 !test_bit(Journal, &rdev->flags) &&
9179 !test_bit(Faulty, &rdev->flags))
9181 if (rdev->raid_disk >= 0)
9183 if (test_bit(Faulty, &rdev->flags))
9185 if (!test_bit(Journal, &rdev->flags)) {
9187 ! (rdev->saved_raid_disk >= 0 &&
9188 !test_bit(Bitmap_sync, &rdev->flags)))
9191 rdev->recovery_offset = 0;
9193 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9194 /* failure here is OK */
9195 sysfs_link_rdev(mddev, rdev);
9196 if (!test_bit(Journal, &rdev->flags))
9199 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9204 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9208 static void md_start_sync(struct work_struct *ws)
9210 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9212 mddev->sync_thread = md_register_thread(md_do_sync,
9215 if (!mddev->sync_thread) {
9216 pr_warn("%s: could not start resync thread...\n",
9218 /* leave the spares where they are, it shouldn't hurt */
9219 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9220 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9221 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9222 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9223 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9224 wake_up(&resync_wait);
9225 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9227 if (mddev->sysfs_action)
9228 sysfs_notify_dirent_safe(mddev->sysfs_action);
9230 md_wakeup_thread(mddev->sync_thread);
9231 sysfs_notify_dirent_safe(mddev->sysfs_action);
9236 * This routine is regularly called by all per-raid-array threads to
9237 * deal with generic issues like resync and super-block update.
9238 * Raid personalities that don't have a thread (linear/raid0) do not
9239 * need this as they never do any recovery or update the superblock.
9241 * It does not do any resync itself, but rather "forks" off other threads
9242 * to do that as needed.
9243 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9244 * "->recovery" and create a thread at ->sync_thread.
9245 * When the thread finishes it sets MD_RECOVERY_DONE
9246 * and wakeups up this thread which will reap the thread and finish up.
9247 * This thread also removes any faulty devices (with nr_pending == 0).
9249 * The overall approach is:
9250 * 1/ if the superblock needs updating, update it.
9251 * 2/ If a recovery thread is running, don't do anything else.
9252 * 3/ If recovery has finished, clean up, possibly marking spares active.
9253 * 4/ If there are any faulty devices, remove them.
9254 * 5/ If array is degraded, try to add spares devices
9255 * 6/ If array has spares or is not in-sync, start a resync thread.
9257 void md_check_recovery(struct mddev *mddev)
9259 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9260 /* Write superblock - thread that called mddev_suspend()
9261 * holds reconfig_mutex for us.
9263 set_bit(MD_UPDATING_SB, &mddev->flags);
9264 smp_mb__after_atomic();
9265 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9266 md_update_sb(mddev, 0);
9267 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9268 wake_up(&mddev->sb_wait);
9271 if (mddev->suspended)
9275 md_bitmap_daemon_work(mddev);
9277 if (signal_pending(current)) {
9278 if (mddev->pers->sync_request && !mddev->external) {
9279 pr_debug("md: %s in immediate safe mode\n",
9281 mddev->safemode = 2;
9283 flush_signals(current);
9286 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9289 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9290 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9291 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9292 (mddev->external == 0 && mddev->safemode == 1) ||
9293 (mddev->safemode == 2
9294 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9298 if (mddev_trylock(mddev)) {
9300 bool try_set_sync = mddev->safemode != 0;
9302 if (!mddev->external && mddev->safemode == 1)
9303 mddev->safemode = 0;
9306 struct md_rdev *rdev;
9307 if (!mddev->external && mddev->in_sync)
9308 /* 'Blocked' flag not needed as failed devices
9309 * will be recorded if array switched to read/write.
9310 * Leaving it set will prevent the device
9311 * from being removed.
9313 rdev_for_each(rdev, mddev)
9314 clear_bit(Blocked, &rdev->flags);
9315 /* On a read-only array we can:
9316 * - remove failed devices
9317 * - add already-in_sync devices if the array itself
9319 * As we only add devices that are already in-sync,
9320 * we can activate the spares immediately.
9322 remove_and_add_spares(mddev, NULL);
9323 /* There is no thread, but we need to call
9324 * ->spare_active and clear saved_raid_disk
9326 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9327 md_reap_sync_thread(mddev);
9328 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9329 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9330 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9334 if (mddev_is_clustered(mddev)) {
9335 struct md_rdev *rdev, *tmp;
9336 /* kick the device if another node issued a
9339 rdev_for_each_safe(rdev, tmp, mddev) {
9340 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9341 rdev->raid_disk < 0)
9342 md_kick_rdev_from_array(rdev);
9346 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9347 spin_lock(&mddev->lock);
9349 spin_unlock(&mddev->lock);
9352 if (mddev->sb_flags)
9353 md_update_sb(mddev, 0);
9355 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9356 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9357 /* resync/recovery still happening */
9358 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9361 if (mddev->sync_thread) {
9362 md_reap_sync_thread(mddev);
9365 /* Set RUNNING before clearing NEEDED to avoid
9366 * any transients in the value of "sync_action".
9368 mddev->curr_resync_completed = 0;
9369 spin_lock(&mddev->lock);
9370 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9371 spin_unlock(&mddev->lock);
9372 /* Clear some bits that don't mean anything, but
9375 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9376 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9378 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9379 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9381 /* no recovery is running.
9382 * remove any failed drives, then
9383 * add spares if possible.
9384 * Spares are also removed and re-added, to allow
9385 * the personality to fail the re-add.
9388 if (mddev->reshape_position != MaxSector) {
9389 if (mddev->pers->check_reshape == NULL ||
9390 mddev->pers->check_reshape(mddev) != 0)
9391 /* Cannot proceed */
9393 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9394 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9395 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9396 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9397 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9398 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9399 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9400 } else if (mddev->recovery_cp < MaxSector) {
9401 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9402 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9403 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9404 /* nothing to be done ... */
9407 if (mddev->pers->sync_request) {
9409 /* We are adding a device or devices to an array
9410 * which has the bitmap stored on all devices.
9411 * So make sure all bitmap pages get written
9413 md_bitmap_write_all(mddev->bitmap);
9415 INIT_WORK(&mddev->del_work, md_start_sync);
9416 queue_work(md_misc_wq, &mddev->del_work);
9420 if (!mddev->sync_thread) {
9421 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9422 wake_up(&resync_wait);
9423 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9425 if (mddev->sysfs_action)
9426 sysfs_notify_dirent_safe(mddev->sysfs_action);
9429 wake_up(&mddev->sb_wait);
9430 mddev_unlock(mddev);
9433 EXPORT_SYMBOL(md_check_recovery);
9435 void md_reap_sync_thread(struct mddev *mddev)
9437 struct md_rdev *rdev;
9438 sector_t old_dev_sectors = mddev->dev_sectors;
9439 bool is_reshaped = false;
9441 /* resync has finished, collect result */
9442 md_unregister_thread(&mddev->sync_thread);
9443 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9444 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9445 mddev->degraded != mddev->raid_disks) {
9447 /* activate any spares */
9448 if (mddev->pers->spare_active(mddev)) {
9449 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9450 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9453 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9454 mddev->pers->finish_reshape) {
9455 mddev->pers->finish_reshape(mddev);
9456 if (mddev_is_clustered(mddev))
9460 /* If array is no-longer degraded, then any saved_raid_disk
9461 * information must be scrapped.
9463 if (!mddev->degraded)
9464 rdev_for_each(rdev, mddev)
9465 rdev->saved_raid_disk = -1;
9467 md_update_sb(mddev, 1);
9468 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9469 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9471 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9472 md_cluster_ops->resync_finish(mddev);
9473 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9474 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9475 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9476 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9477 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9478 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9480 * We call md_cluster_ops->update_size here because sync_size could
9481 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9482 * so it is time to update size across cluster.
9484 if (mddev_is_clustered(mddev) && is_reshaped
9485 && !test_bit(MD_CLOSING, &mddev->flags))
9486 md_cluster_ops->update_size(mddev, old_dev_sectors);
9487 wake_up(&resync_wait);
9488 /* flag recovery needed just to double check */
9489 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9490 sysfs_notify_dirent_safe(mddev->sysfs_action);
9492 if (mddev->event_work.func)
9493 queue_work(md_misc_wq, &mddev->event_work);
9495 EXPORT_SYMBOL(md_reap_sync_thread);
9497 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9499 sysfs_notify_dirent_safe(rdev->sysfs_state);
9500 wait_event_timeout(rdev->blocked_wait,
9501 !test_bit(Blocked, &rdev->flags) &&
9502 !test_bit(BlockedBadBlocks, &rdev->flags),
9503 msecs_to_jiffies(5000));
9504 rdev_dec_pending(rdev, mddev);
9506 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9508 void md_finish_reshape(struct mddev *mddev)
9510 /* called be personality module when reshape completes. */
9511 struct md_rdev *rdev;
9513 rdev_for_each(rdev, mddev) {
9514 if (rdev->data_offset > rdev->new_data_offset)
9515 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9517 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9518 rdev->data_offset = rdev->new_data_offset;
9521 EXPORT_SYMBOL(md_finish_reshape);
9523 /* Bad block management */
9525 /* Returns 1 on success, 0 on failure */
9526 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9529 struct mddev *mddev = rdev->mddev;
9532 s += rdev->new_data_offset;
9534 s += rdev->data_offset;
9535 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9537 /* Make sure they get written out promptly */
9538 if (test_bit(ExternalBbl, &rdev->flags))
9539 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9540 sysfs_notify_dirent_safe(rdev->sysfs_state);
9541 set_mask_bits(&mddev->sb_flags, 0,
9542 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9543 md_wakeup_thread(rdev->mddev->thread);
9548 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9550 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9555 s += rdev->new_data_offset;
9557 s += rdev->data_offset;
9558 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9559 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9560 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9563 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9565 static int md_notify_reboot(struct notifier_block *this,
9566 unsigned long code, void *x)
9568 struct list_head *tmp;
9569 struct mddev *mddev;
9572 for_each_mddev(mddev, tmp) {
9573 if (mddev_trylock(mddev)) {
9575 __md_stop_writes(mddev);
9576 if (mddev->persistent)
9577 mddev->safemode = 2;
9578 mddev_unlock(mddev);
9583 * certain more exotic SCSI devices are known to be
9584 * volatile wrt too early system reboots. While the
9585 * right place to handle this issue is the given
9586 * driver, we do want to have a safe RAID driver ...
9594 static struct notifier_block md_notifier = {
9595 .notifier_call = md_notify_reboot,
9597 .priority = INT_MAX, /* before any real devices */
9600 static void md_geninit(void)
9602 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9604 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9607 static int __init md_init(void)
9611 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9615 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9619 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9620 if (!md_rdev_misc_wq)
9621 goto err_rdev_misc_wq;
9623 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9627 ret = __register_blkdev(0, "mdp", md_probe);
9632 register_reboot_notifier(&md_notifier);
9633 raid_table_header = register_sysctl_table(raid_root_table);
9639 unregister_blkdev(MD_MAJOR, "md");
9641 destroy_workqueue(md_rdev_misc_wq);
9643 destroy_workqueue(md_misc_wq);
9645 destroy_workqueue(md_wq);
9650 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9652 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9653 struct md_rdev *rdev2, *tmp;
9655 char b[BDEVNAME_SIZE];
9658 * If size is changed in another node then we need to
9659 * do resize as well.
9661 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9662 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9664 pr_info("md-cluster: resize failed\n");
9666 md_bitmap_update_sb(mddev->bitmap);
9669 /* Check for change of roles in the active devices */
9670 rdev_for_each_safe(rdev2, tmp, mddev) {
9671 if (test_bit(Faulty, &rdev2->flags))
9674 /* Check if the roles changed */
9675 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9677 if (test_bit(Candidate, &rdev2->flags)) {
9678 if (role == MD_DISK_ROLE_FAULTY) {
9679 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9680 md_kick_rdev_from_array(rdev2);
9684 clear_bit(Candidate, &rdev2->flags);
9687 if (role != rdev2->raid_disk) {
9689 * got activated except reshape is happening.
9691 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9692 !(le32_to_cpu(sb->feature_map) &
9693 MD_FEATURE_RESHAPE_ACTIVE)) {
9694 rdev2->saved_raid_disk = role;
9695 ret = remove_and_add_spares(mddev, rdev2);
9696 pr_info("Activated spare: %s\n",
9697 bdevname(rdev2->bdev,b));
9698 /* wakeup mddev->thread here, so array could
9699 * perform resync with the new activated disk */
9700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9701 md_wakeup_thread(mddev->thread);
9704 * We just want to do the minimum to mark the disk
9705 * as faulty. The recovery is performed by the
9706 * one who initiated the error.
9708 if (role == MD_DISK_ROLE_FAULTY ||
9709 role == MD_DISK_ROLE_JOURNAL) {
9710 md_error(mddev, rdev2);
9711 clear_bit(Blocked, &rdev2->flags);
9716 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9717 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9719 pr_warn("md: updating array disks failed. %d\n", ret);
9723 * Since mddev->delta_disks has already updated in update_raid_disks,
9724 * so it is time to check reshape.
9726 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9727 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9729 * reshape is happening in the remote node, we need to
9730 * update reshape_position and call start_reshape.
9732 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9733 if (mddev->pers->update_reshape_pos)
9734 mddev->pers->update_reshape_pos(mddev);
9735 if (mddev->pers->start_reshape)
9736 mddev->pers->start_reshape(mddev);
9737 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9738 mddev->reshape_position != MaxSector &&
9739 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9740 /* reshape is just done in another node. */
9741 mddev->reshape_position = MaxSector;
9742 if (mddev->pers->update_reshape_pos)
9743 mddev->pers->update_reshape_pos(mddev);
9746 /* Finally set the event to be up to date */
9747 mddev->events = le64_to_cpu(sb->events);
9750 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9753 struct page *swapout = rdev->sb_page;
9754 struct mdp_superblock_1 *sb;
9756 /* Store the sb page of the rdev in the swapout temporary
9757 * variable in case we err in the future
9759 rdev->sb_page = NULL;
9760 err = alloc_disk_sb(rdev);
9762 ClearPageUptodate(rdev->sb_page);
9763 rdev->sb_loaded = 0;
9764 err = super_types[mddev->major_version].
9765 load_super(rdev, NULL, mddev->minor_version);
9768 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9769 __func__, __LINE__, rdev->desc_nr, err);
9771 put_page(rdev->sb_page);
9772 rdev->sb_page = swapout;
9773 rdev->sb_loaded = 1;
9777 sb = page_address(rdev->sb_page);
9778 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9782 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9783 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9785 /* The other node finished recovery, call spare_active to set
9786 * device In_sync and mddev->degraded
9788 if (rdev->recovery_offset == MaxSector &&
9789 !test_bit(In_sync, &rdev->flags) &&
9790 mddev->pers->spare_active(mddev))
9791 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9797 void md_reload_sb(struct mddev *mddev, int nr)
9799 struct md_rdev *rdev = NULL, *iter;
9803 rdev_for_each_rcu(iter, mddev) {
9804 if (iter->desc_nr == nr) {
9811 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9815 err = read_rdev(mddev, rdev);
9819 check_sb_changes(mddev, rdev);
9821 /* Read all rdev's to update recovery_offset */
9822 rdev_for_each_rcu(rdev, mddev) {
9823 if (!test_bit(Faulty, &rdev->flags))
9824 read_rdev(mddev, rdev);
9827 EXPORT_SYMBOL(md_reload_sb);
9832 * Searches all registered partitions for autorun RAID arrays
9836 static DEFINE_MUTEX(detected_devices_mutex);
9837 static LIST_HEAD(all_detected_devices);
9838 struct detected_devices_node {
9839 struct list_head list;
9843 void md_autodetect_dev(dev_t dev)
9845 struct detected_devices_node *node_detected_dev;
9847 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9848 if (node_detected_dev) {
9849 node_detected_dev->dev = dev;
9850 mutex_lock(&detected_devices_mutex);
9851 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9852 mutex_unlock(&detected_devices_mutex);
9856 void md_autostart_arrays(int part)
9858 struct md_rdev *rdev;
9859 struct detected_devices_node *node_detected_dev;
9861 int i_scanned, i_passed;
9866 pr_info("md: Autodetecting RAID arrays.\n");
9868 mutex_lock(&detected_devices_mutex);
9869 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9871 node_detected_dev = list_entry(all_detected_devices.next,
9872 struct detected_devices_node, list);
9873 list_del(&node_detected_dev->list);
9874 dev = node_detected_dev->dev;
9875 kfree(node_detected_dev);
9876 mutex_unlock(&detected_devices_mutex);
9877 rdev = md_import_device(dev,0, 90);
9878 mutex_lock(&detected_devices_mutex);
9882 if (test_bit(Faulty, &rdev->flags))
9885 set_bit(AutoDetected, &rdev->flags);
9886 list_add(&rdev->same_set, &pending_raid_disks);
9889 mutex_unlock(&detected_devices_mutex);
9891 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9893 autorun_devices(part);
9896 #endif /* !MODULE */
9898 static __exit void md_exit(void)
9900 struct mddev *mddev;
9901 struct list_head *tmp;
9904 unregister_blkdev(MD_MAJOR,"md");
9905 unregister_blkdev(mdp_major, "mdp");
9906 unregister_reboot_notifier(&md_notifier);
9907 unregister_sysctl_table(raid_table_header);
9909 /* We cannot unload the modules while some process is
9910 * waiting for us in select() or poll() - wake them up
9913 while (waitqueue_active(&md_event_waiters)) {
9914 /* not safe to leave yet */
9915 wake_up(&md_event_waiters);
9919 remove_proc_entry("mdstat", NULL);
9921 for_each_mddev(mddev, tmp) {
9922 export_array(mddev);
9924 mddev->hold_active = 0;
9926 * for_each_mddev() will call mddev_put() at the end of each
9927 * iteration. As the mddev is now fully clear, this will
9928 * schedule the mddev for destruction by a workqueue, and the
9929 * destroy_workqueue() below will wait for that to complete.
9932 destroy_workqueue(md_rdev_misc_wq);
9933 destroy_workqueue(md_misc_wq);
9934 destroy_workqueue(md_wq);
9937 subsys_initcall(md_init);
9938 module_exit(md_exit)
9940 static int get_ro(char *buffer, const struct kernel_param *kp)
9942 return sprintf(buffer, "%d\n", start_readonly);
9944 static int set_ro(const char *val, const struct kernel_param *kp)
9946 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9949 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9950 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9951 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9952 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9954 MODULE_LICENSE("GPL");
9955 MODULE_DESCRIPTION("MD RAID framework");
9957 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);