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(struct mddev *mddev)
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)) {
422 prepare_to_wait(&mddev->sb_wait, &__wait,
423 TASK_UNINTERRUPTIBLE);
424 if (!is_suspended(mddev, bio))
430 finish_wait(&mddev->sb_wait, &__wait);
432 atomic_inc(&mddev->active_io);
435 if (!mddev->pers->make_request(mddev, bio)) {
436 atomic_dec(&mddev->active_io);
437 wake_up(&mddev->sb_wait);
438 goto check_suspended;
441 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
442 wake_up(&mddev->sb_wait);
444 EXPORT_SYMBOL(md_handle_request);
446 static blk_qc_t md_submit_bio(struct bio *bio)
448 const int rw = bio_data_dir(bio);
449 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
451 if (mddev == NULL || mddev->pers == NULL) {
453 return BLK_QC_T_NONE;
456 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
458 return BLK_QC_T_NONE;
461 blk_queue_split(&bio);
463 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
464 if (bio_sectors(bio) != 0)
465 bio->bi_status = BLK_STS_IOERR;
467 return BLK_QC_T_NONE;
470 /* bio could be mergeable after passing to underlayer */
471 bio->bi_opf &= ~REQ_NOMERGE;
473 md_handle_request(mddev, bio);
475 return BLK_QC_T_NONE;
478 /* mddev_suspend makes sure no new requests are submitted
479 * to the device, and that any requests that have been submitted
480 * are completely handled.
481 * Once mddev_detach() is called and completes, the module will be
484 void mddev_suspend(struct mddev *mddev)
486 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
487 lockdep_assert_held(&mddev->reconfig_mutex);
488 if (mddev->suspended++)
491 wake_up(&mddev->sb_wait);
492 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
493 smp_mb__after_atomic();
494 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
495 mddev->pers->quiesce(mddev, 1);
496 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
497 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
499 del_timer_sync(&mddev->safemode_timer);
500 /* restrict memory reclaim I/O during raid array is suspend */
501 mddev->noio_flag = memalloc_noio_save();
503 EXPORT_SYMBOL_GPL(mddev_suspend);
505 void mddev_resume(struct mddev *mddev)
507 /* entred the memalloc scope from mddev_suspend() */
508 memalloc_noio_restore(mddev->noio_flag);
509 lockdep_assert_held(&mddev->reconfig_mutex);
510 if (--mddev->suspended)
512 wake_up(&mddev->sb_wait);
513 mddev->pers->quiesce(mddev, 0);
515 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
516 md_wakeup_thread(mddev->thread);
517 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
519 EXPORT_SYMBOL_GPL(mddev_resume);
522 * Generic flush handling for md
525 static void md_end_flush(struct bio *bio)
527 struct md_rdev *rdev = bio->bi_private;
528 struct mddev *mddev = rdev->mddev;
530 rdev_dec_pending(rdev, mddev);
532 if (atomic_dec_and_test(&mddev->flush_pending)) {
533 /* The pre-request flush has finished */
534 queue_work(md_wq, &mddev->flush_work);
539 static void md_submit_flush_data(struct work_struct *ws);
541 static void submit_flushes(struct work_struct *ws)
543 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
544 struct md_rdev *rdev;
546 mddev->start_flush = ktime_get_boottime();
547 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
548 atomic_set(&mddev->flush_pending, 1);
550 rdev_for_each_rcu(rdev, mddev)
551 if (rdev->raid_disk >= 0 &&
552 !test_bit(Faulty, &rdev->flags)) {
553 /* Take two references, one is dropped
554 * when request finishes, one after
555 * we reclaim rcu_read_lock
558 atomic_inc(&rdev->nr_pending);
559 atomic_inc(&rdev->nr_pending);
561 bi = bio_alloc_bioset(GFP_NOIO, 0, &mddev->bio_set);
562 bi->bi_end_io = md_end_flush;
563 bi->bi_private = rdev;
564 bio_set_dev(bi, rdev->bdev);
565 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
566 atomic_inc(&mddev->flush_pending);
569 rdev_dec_pending(rdev, mddev);
572 if (atomic_dec_and_test(&mddev->flush_pending))
573 queue_work(md_wq, &mddev->flush_work);
576 static void md_submit_flush_data(struct work_struct *ws)
578 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
579 struct bio *bio = mddev->flush_bio;
582 * must reset flush_bio before calling into md_handle_request to avoid a
583 * deadlock, because other bios passed md_handle_request suspend check
584 * could wait for this and below md_handle_request could wait for those
585 * bios because of suspend check
587 spin_lock_irq(&mddev->lock);
588 mddev->prev_flush_start = mddev->start_flush;
589 mddev->flush_bio = NULL;
590 spin_unlock_irq(&mddev->lock);
591 wake_up(&mddev->sb_wait);
593 if (bio->bi_iter.bi_size == 0) {
594 /* an empty barrier - all done */
597 bio->bi_opf &= ~REQ_PREFLUSH;
598 md_handle_request(mddev, bio);
603 * Manages consolidation of flushes and submitting any flushes needed for
604 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
605 * being finished in another context. Returns false if the flushing is
606 * complete but still needs the I/O portion of the bio to be processed.
608 bool md_flush_request(struct mddev *mddev, struct bio *bio)
610 ktime_t req_start = ktime_get_boottime();
611 spin_lock_irq(&mddev->lock);
612 /* flush requests wait until ongoing flush completes,
613 * hence coalescing all the pending requests.
615 wait_event_lock_irq(mddev->sb_wait,
617 ktime_before(req_start, mddev->prev_flush_start),
619 /* new request after previous flush is completed */
620 if (ktime_after(req_start, mddev->prev_flush_start)) {
621 WARN_ON(mddev->flush_bio);
622 mddev->flush_bio = bio;
625 spin_unlock_irq(&mddev->lock);
628 INIT_WORK(&mddev->flush_work, submit_flushes);
629 queue_work(md_wq, &mddev->flush_work);
631 /* flush was performed for some other bio while we waited. */
632 if (bio->bi_iter.bi_size == 0)
633 /* an empty barrier - all done */
636 bio->bi_opf &= ~REQ_PREFLUSH;
642 EXPORT_SYMBOL(md_flush_request);
644 static inline struct mddev *mddev_get(struct mddev *mddev)
646 atomic_inc(&mddev->active);
650 static void mddev_delayed_delete(struct work_struct *ws);
652 static void mddev_put(struct mddev *mddev)
654 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
656 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
657 mddev->ctime == 0 && !mddev->hold_active) {
658 /* Array is not configured at all, and not held active,
660 list_del_init(&mddev->all_mddevs);
663 * Call queue_work inside the spinlock so that
664 * flush_workqueue() after mddev_find will succeed in waiting
665 * for the work to be done.
667 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
668 queue_work(md_misc_wq, &mddev->del_work);
670 spin_unlock(&all_mddevs_lock);
673 static void md_safemode_timeout(struct timer_list *t);
675 void mddev_init(struct mddev *mddev)
677 kobject_init(&mddev->kobj, &md_ktype);
678 mutex_init(&mddev->open_mutex);
679 mutex_init(&mddev->reconfig_mutex);
680 mutex_init(&mddev->bitmap_info.mutex);
681 INIT_LIST_HEAD(&mddev->disks);
682 INIT_LIST_HEAD(&mddev->all_mddevs);
683 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
684 atomic_set(&mddev->active, 1);
685 atomic_set(&mddev->openers, 0);
686 atomic_set(&mddev->active_io, 0);
687 spin_lock_init(&mddev->lock);
688 atomic_set(&mddev->flush_pending, 0);
689 init_waitqueue_head(&mddev->sb_wait);
690 init_waitqueue_head(&mddev->recovery_wait);
691 mddev->reshape_position = MaxSector;
692 mddev->reshape_backwards = 0;
693 mddev->last_sync_action = "none";
694 mddev->resync_min = 0;
695 mddev->resync_max = MaxSector;
696 mddev->level = LEVEL_NONE;
698 EXPORT_SYMBOL_GPL(mddev_init);
700 static struct mddev *mddev_find_locked(dev_t unit)
704 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
705 if (mddev->unit == unit)
711 /* find an unused unit number */
712 static dev_t mddev_alloc_unit(void)
714 static int next_minor = 512;
715 int start = next_minor;
720 dev = MKDEV(MD_MAJOR, next_minor);
722 if (next_minor > MINORMASK)
724 if (next_minor == start)
725 return 0; /* Oh dear, all in use. */
726 is_free = !mddev_find_locked(dev);
732 static struct mddev *mddev_find(dev_t unit)
736 if (MAJOR(unit) != MD_MAJOR)
737 unit &= ~((1 << MdpMinorShift) - 1);
739 spin_lock(&all_mddevs_lock);
740 mddev = mddev_find_locked(unit);
743 spin_unlock(&all_mddevs_lock);
748 static struct mddev *mddev_alloc(dev_t unit)
753 if (unit && MAJOR(unit) != MD_MAJOR)
754 unit &= ~((1 << MdpMinorShift) - 1);
756 new = kzalloc(sizeof(*new), GFP_KERNEL);
758 return ERR_PTR(-ENOMEM);
761 spin_lock(&all_mddevs_lock);
764 if (mddev_find_locked(unit))
767 if (MAJOR(unit) == MD_MAJOR)
768 new->md_minor = MINOR(unit);
770 new->md_minor = MINOR(unit) >> MdpMinorShift;
771 new->hold_active = UNTIL_IOCTL;
774 new->unit = mddev_alloc_unit();
777 new->md_minor = MINOR(new->unit);
778 new->hold_active = UNTIL_STOP;
781 list_add(&new->all_mddevs, &all_mddevs);
782 spin_unlock(&all_mddevs_lock);
785 spin_unlock(&all_mddevs_lock);
787 return ERR_PTR(error);
790 static const struct attribute_group md_redundancy_group;
792 void mddev_unlock(struct mddev *mddev)
794 if (mddev->to_remove) {
795 /* These cannot be removed under reconfig_mutex as
796 * an access to the files will try to take reconfig_mutex
797 * while holding the file unremovable, which leads to
799 * So hold set sysfs_active while the remove in happeing,
800 * and anything else which might set ->to_remove or my
801 * otherwise change the sysfs namespace will fail with
802 * -EBUSY if sysfs_active is still set.
803 * We set sysfs_active under reconfig_mutex and elsewhere
804 * test it under the same mutex to ensure its correct value
807 const struct attribute_group *to_remove = mddev->to_remove;
808 mddev->to_remove = NULL;
809 mddev->sysfs_active = 1;
810 mutex_unlock(&mddev->reconfig_mutex);
812 if (mddev->kobj.sd) {
813 if (to_remove != &md_redundancy_group)
814 sysfs_remove_group(&mddev->kobj, to_remove);
815 if (mddev->pers == NULL ||
816 mddev->pers->sync_request == NULL) {
817 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
818 if (mddev->sysfs_action)
819 sysfs_put(mddev->sysfs_action);
820 if (mddev->sysfs_completed)
821 sysfs_put(mddev->sysfs_completed);
822 if (mddev->sysfs_degraded)
823 sysfs_put(mddev->sysfs_degraded);
824 mddev->sysfs_action = NULL;
825 mddev->sysfs_completed = NULL;
826 mddev->sysfs_degraded = NULL;
829 mddev->sysfs_active = 0;
831 mutex_unlock(&mddev->reconfig_mutex);
833 /* As we've dropped the mutex we need a spinlock to
834 * make sure the thread doesn't disappear
836 spin_lock(&pers_lock);
837 md_wakeup_thread(mddev->thread);
838 wake_up(&mddev->sb_wait);
839 spin_unlock(&pers_lock);
841 EXPORT_SYMBOL_GPL(mddev_unlock);
843 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
845 struct md_rdev *rdev;
847 rdev_for_each_rcu(rdev, mddev)
848 if (rdev->desc_nr == nr)
853 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
855 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
857 struct md_rdev *rdev;
859 rdev_for_each(rdev, mddev)
860 if (rdev->bdev->bd_dev == dev)
866 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
868 struct md_rdev *rdev;
870 rdev_for_each_rcu(rdev, mddev)
871 if (rdev->bdev->bd_dev == dev)
876 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
878 static struct md_personality *find_pers(int level, char *clevel)
880 struct md_personality *pers;
881 list_for_each_entry(pers, &pers_list, list) {
882 if (level != LEVEL_NONE && pers->level == level)
884 if (strcmp(pers->name, clevel)==0)
890 /* return the offset of the super block in 512byte sectors */
891 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
893 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
894 return MD_NEW_SIZE_SECTORS(num_sectors);
897 static int alloc_disk_sb(struct md_rdev *rdev)
899 rdev->sb_page = alloc_page(GFP_KERNEL);
905 void md_rdev_clear(struct md_rdev *rdev)
908 put_page(rdev->sb_page);
910 rdev->sb_page = NULL;
915 put_page(rdev->bb_page);
916 rdev->bb_page = NULL;
918 badblocks_exit(&rdev->badblocks);
920 EXPORT_SYMBOL_GPL(md_rdev_clear);
922 static void super_written(struct bio *bio)
924 struct md_rdev *rdev = bio->bi_private;
925 struct mddev *mddev = rdev->mddev;
927 if (bio->bi_status) {
928 pr_err("md: %s gets error=%d\n", __func__,
929 blk_status_to_errno(bio->bi_status));
930 md_error(mddev, rdev);
931 if (!test_bit(Faulty, &rdev->flags)
932 && (bio->bi_opf & MD_FAILFAST)) {
933 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
934 set_bit(LastDev, &rdev->flags);
937 clear_bit(LastDev, &rdev->flags);
939 if (atomic_dec_and_test(&mddev->pending_writes))
940 wake_up(&mddev->sb_wait);
941 rdev_dec_pending(rdev, mddev);
945 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
946 sector_t sector, int size, struct page *page)
948 /* write first size bytes of page to sector of rdev
949 * Increment mddev->pending_writes before returning
950 * and decrement it on completion, waking up sb_wait
951 * if zero is reached.
952 * If an error occurred, call md_error
960 if (test_bit(Faulty, &rdev->flags))
963 bio = bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
965 atomic_inc(&rdev->nr_pending);
967 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
968 bio->bi_iter.bi_sector = sector;
969 bio_add_page(bio, page, size, 0);
970 bio->bi_private = rdev;
971 bio->bi_end_io = super_written;
973 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
974 test_bit(FailFast, &rdev->flags) &&
975 !test_bit(LastDev, &rdev->flags))
977 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
979 atomic_inc(&mddev->pending_writes);
983 int md_super_wait(struct mddev *mddev)
985 /* wait for all superblock writes that were scheduled to complete */
986 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
987 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
992 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
993 struct page *page, int op, int op_flags, bool metadata_op)
998 bio_init(&bio, &bvec, 1);
1000 if (metadata_op && rdev->meta_bdev)
1001 bio_set_dev(&bio, rdev->meta_bdev);
1003 bio_set_dev(&bio, rdev->bdev);
1004 bio.bi_opf = op | op_flags;
1006 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1007 else if (rdev->mddev->reshape_position != MaxSector &&
1008 (rdev->mddev->reshape_backwards ==
1009 (sector >= rdev->mddev->reshape_position)))
1010 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1012 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1013 bio_add_page(&bio, page, size, 0);
1015 submit_bio_wait(&bio);
1017 return !bio.bi_status;
1019 EXPORT_SYMBOL_GPL(sync_page_io);
1021 static int read_disk_sb(struct md_rdev *rdev, int size)
1023 char b[BDEVNAME_SIZE];
1025 if (rdev->sb_loaded)
1028 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1030 rdev->sb_loaded = 1;
1034 pr_err("md: disabled device %s, could not read superblock.\n",
1035 bdevname(rdev->bdev,b));
1039 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1041 return sb1->set_uuid0 == sb2->set_uuid0 &&
1042 sb1->set_uuid1 == sb2->set_uuid1 &&
1043 sb1->set_uuid2 == sb2->set_uuid2 &&
1044 sb1->set_uuid3 == sb2->set_uuid3;
1047 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1050 mdp_super_t *tmp1, *tmp2;
1052 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1053 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1055 if (!tmp1 || !tmp2) {
1064 * nr_disks is not constant
1069 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1076 static u32 md_csum_fold(u32 csum)
1078 csum = (csum & 0xffff) + (csum >> 16);
1079 return (csum & 0xffff) + (csum >> 16);
1082 static unsigned int calc_sb_csum(mdp_super_t *sb)
1085 u32 *sb32 = (u32*)sb;
1087 unsigned int disk_csum, csum;
1089 disk_csum = sb->sb_csum;
1092 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1094 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1097 /* This used to use csum_partial, which was wrong for several
1098 * reasons including that different results are returned on
1099 * different architectures. It isn't critical that we get exactly
1100 * the same return value as before (we always csum_fold before
1101 * testing, and that removes any differences). However as we
1102 * know that csum_partial always returned a 16bit value on
1103 * alphas, do a fold to maximise conformity to previous behaviour.
1105 sb->sb_csum = md_csum_fold(disk_csum);
1107 sb->sb_csum = disk_csum;
1113 * Handle superblock details.
1114 * We want to be able to handle multiple superblock formats
1115 * so we have a common interface to them all, and an array of
1116 * different handlers.
1117 * We rely on user-space to write the initial superblock, and support
1118 * reading and updating of superblocks.
1119 * Interface methods are:
1120 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1121 * loads and validates a superblock on dev.
1122 * if refdev != NULL, compare superblocks on both devices
1124 * 0 - dev has a superblock that is compatible with refdev
1125 * 1 - dev has a superblock that is compatible and newer than refdev
1126 * so dev should be used as the refdev in future
1127 * -EINVAL superblock incompatible or invalid
1128 * -othererror e.g. -EIO
1130 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1131 * Verify that dev is acceptable into mddev.
1132 * The first time, mddev->raid_disks will be 0, and data from
1133 * dev should be merged in. Subsequent calls check that dev
1134 * is new enough. Return 0 or -EINVAL
1136 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1137 * Update the superblock for rdev with data in mddev
1138 * This does not write to disc.
1144 struct module *owner;
1145 int (*load_super)(struct md_rdev *rdev,
1146 struct md_rdev *refdev,
1148 int (*validate_super)(struct mddev *mddev,
1149 struct md_rdev *rdev);
1150 void (*sync_super)(struct mddev *mddev,
1151 struct md_rdev *rdev);
1152 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1153 sector_t num_sectors);
1154 int (*allow_new_offset)(struct md_rdev *rdev,
1155 unsigned long long new_offset);
1159 * Check that the given mddev has no bitmap.
1161 * This function is called from the run method of all personalities that do not
1162 * support bitmaps. It prints an error message and returns non-zero if mddev
1163 * has a bitmap. Otherwise, it returns 0.
1166 int md_check_no_bitmap(struct mddev *mddev)
1168 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1170 pr_warn("%s: bitmaps are not supported for %s\n",
1171 mdname(mddev), mddev->pers->name);
1174 EXPORT_SYMBOL(md_check_no_bitmap);
1177 * load_super for 0.90.0
1179 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1181 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1184 bool spare_disk = true;
1187 * Calculate the position of the superblock (512byte sectors),
1188 * it's at the end of the disk.
1190 * It also happens to be a multiple of 4Kb.
1192 rdev->sb_start = calc_dev_sboffset(rdev);
1194 ret = read_disk_sb(rdev, MD_SB_BYTES);
1200 bdevname(rdev->bdev, b);
1201 sb = page_address(rdev->sb_page);
1203 if (sb->md_magic != MD_SB_MAGIC) {
1204 pr_warn("md: invalid raid superblock magic on %s\n", b);
1208 if (sb->major_version != 0 ||
1209 sb->minor_version < 90 ||
1210 sb->minor_version > 91) {
1211 pr_warn("Bad version number %d.%d on %s\n",
1212 sb->major_version, sb->minor_version, b);
1216 if (sb->raid_disks <= 0)
1219 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1220 pr_warn("md: invalid superblock checksum on %s\n", b);
1224 rdev->preferred_minor = sb->md_minor;
1225 rdev->data_offset = 0;
1226 rdev->new_data_offset = 0;
1227 rdev->sb_size = MD_SB_BYTES;
1228 rdev->badblocks.shift = -1;
1230 if (sb->level == LEVEL_MULTIPATH)
1233 rdev->desc_nr = sb->this_disk.number;
1235 /* not spare disk, or LEVEL_MULTIPATH */
1236 if (sb->level == LEVEL_MULTIPATH ||
1237 (rdev->desc_nr >= 0 &&
1238 rdev->desc_nr < MD_SB_DISKS &&
1239 sb->disks[rdev->desc_nr].state &
1240 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1250 mdp_super_t *refsb = page_address(refdev->sb_page);
1251 if (!md_uuid_equal(refsb, sb)) {
1252 pr_warn("md: %s has different UUID to %s\n",
1253 b, bdevname(refdev->bdev,b2));
1256 if (!md_sb_equal(refsb, sb)) {
1257 pr_warn("md: %s has same UUID but different superblock to %s\n",
1258 b, bdevname(refdev->bdev, b2));
1262 ev2 = md_event(refsb);
1264 if (!spare_disk && ev1 > ev2)
1269 rdev->sectors = rdev->sb_start;
1270 /* Limit to 4TB as metadata cannot record more than that.
1271 * (not needed for Linear and RAID0 as metadata doesn't
1274 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1275 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1277 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1278 /* "this cannot possibly happen" ... */
1286 * validate_super for 0.90.0
1288 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1291 mdp_super_t *sb = page_address(rdev->sb_page);
1292 __u64 ev1 = md_event(sb);
1294 rdev->raid_disk = -1;
1295 clear_bit(Faulty, &rdev->flags);
1296 clear_bit(In_sync, &rdev->flags);
1297 clear_bit(Bitmap_sync, &rdev->flags);
1298 clear_bit(WriteMostly, &rdev->flags);
1300 if (mddev->raid_disks == 0) {
1301 mddev->major_version = 0;
1302 mddev->minor_version = sb->minor_version;
1303 mddev->patch_version = sb->patch_version;
1304 mddev->external = 0;
1305 mddev->chunk_sectors = sb->chunk_size >> 9;
1306 mddev->ctime = sb->ctime;
1307 mddev->utime = sb->utime;
1308 mddev->level = sb->level;
1309 mddev->clevel[0] = 0;
1310 mddev->layout = sb->layout;
1311 mddev->raid_disks = sb->raid_disks;
1312 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1313 mddev->events = ev1;
1314 mddev->bitmap_info.offset = 0;
1315 mddev->bitmap_info.space = 0;
1316 /* bitmap can use 60 K after the 4K superblocks */
1317 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1318 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1319 mddev->reshape_backwards = 0;
1321 if (mddev->minor_version >= 91) {
1322 mddev->reshape_position = sb->reshape_position;
1323 mddev->delta_disks = sb->delta_disks;
1324 mddev->new_level = sb->new_level;
1325 mddev->new_layout = sb->new_layout;
1326 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1327 if (mddev->delta_disks < 0)
1328 mddev->reshape_backwards = 1;
1330 mddev->reshape_position = MaxSector;
1331 mddev->delta_disks = 0;
1332 mddev->new_level = mddev->level;
1333 mddev->new_layout = mddev->layout;
1334 mddev->new_chunk_sectors = mddev->chunk_sectors;
1336 if (mddev->level == 0)
1339 if (sb->state & (1<<MD_SB_CLEAN))
1340 mddev->recovery_cp = MaxSector;
1342 if (sb->events_hi == sb->cp_events_hi &&
1343 sb->events_lo == sb->cp_events_lo) {
1344 mddev->recovery_cp = sb->recovery_cp;
1346 mddev->recovery_cp = 0;
1349 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1350 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1351 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1352 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1354 mddev->max_disks = MD_SB_DISKS;
1356 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1357 mddev->bitmap_info.file == NULL) {
1358 mddev->bitmap_info.offset =
1359 mddev->bitmap_info.default_offset;
1360 mddev->bitmap_info.space =
1361 mddev->bitmap_info.default_space;
1364 } else if (mddev->pers == NULL) {
1365 /* Insist on good event counter while assembling, except
1366 * for spares (which don't need an event count) */
1368 if (sb->disks[rdev->desc_nr].state & (
1369 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1370 if (ev1 < mddev->events)
1372 } else if (mddev->bitmap) {
1373 /* if adding to array with a bitmap, then we can accept an
1374 * older device ... but not too old.
1376 if (ev1 < mddev->bitmap->events_cleared)
1378 if (ev1 < mddev->events)
1379 set_bit(Bitmap_sync, &rdev->flags);
1381 if (ev1 < mddev->events)
1382 /* just a hot-add of a new device, leave raid_disk at -1 */
1386 if (mddev->level != LEVEL_MULTIPATH) {
1387 desc = sb->disks + rdev->desc_nr;
1389 if (desc->state & (1<<MD_DISK_FAULTY))
1390 set_bit(Faulty, &rdev->flags);
1391 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1392 desc->raid_disk < mddev->raid_disks */) {
1393 set_bit(In_sync, &rdev->flags);
1394 rdev->raid_disk = desc->raid_disk;
1395 rdev->saved_raid_disk = desc->raid_disk;
1396 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1397 /* active but not in sync implies recovery up to
1398 * reshape position. We don't know exactly where
1399 * that is, so set to zero for now */
1400 if (mddev->minor_version >= 91) {
1401 rdev->recovery_offset = 0;
1402 rdev->raid_disk = desc->raid_disk;
1405 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1406 set_bit(WriteMostly, &rdev->flags);
1407 if (desc->state & (1<<MD_DISK_FAILFAST))
1408 set_bit(FailFast, &rdev->flags);
1409 } else /* MULTIPATH are always insync */
1410 set_bit(In_sync, &rdev->flags);
1415 * sync_super for 0.90.0
1417 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1420 struct md_rdev *rdev2;
1421 int next_spare = mddev->raid_disks;
1423 /* make rdev->sb match mddev data..
1426 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1427 * 3/ any empty disks < next_spare become removed
1429 * disks[0] gets initialised to REMOVED because
1430 * we cannot be sure from other fields if it has
1431 * been initialised or not.
1434 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1436 rdev->sb_size = MD_SB_BYTES;
1438 sb = page_address(rdev->sb_page);
1440 memset(sb, 0, sizeof(*sb));
1442 sb->md_magic = MD_SB_MAGIC;
1443 sb->major_version = mddev->major_version;
1444 sb->patch_version = mddev->patch_version;
1445 sb->gvalid_words = 0; /* ignored */
1446 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1447 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1448 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1449 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1451 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1452 sb->level = mddev->level;
1453 sb->size = mddev->dev_sectors / 2;
1454 sb->raid_disks = mddev->raid_disks;
1455 sb->md_minor = mddev->md_minor;
1456 sb->not_persistent = 0;
1457 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1459 sb->events_hi = (mddev->events>>32);
1460 sb->events_lo = (u32)mddev->events;
1462 if (mddev->reshape_position == MaxSector)
1463 sb->minor_version = 90;
1465 sb->minor_version = 91;
1466 sb->reshape_position = mddev->reshape_position;
1467 sb->new_level = mddev->new_level;
1468 sb->delta_disks = mddev->delta_disks;
1469 sb->new_layout = mddev->new_layout;
1470 sb->new_chunk = mddev->new_chunk_sectors << 9;
1472 mddev->minor_version = sb->minor_version;
1475 sb->recovery_cp = mddev->recovery_cp;
1476 sb->cp_events_hi = (mddev->events>>32);
1477 sb->cp_events_lo = (u32)mddev->events;
1478 if (mddev->recovery_cp == MaxSector)
1479 sb->state = (1<< MD_SB_CLEAN);
1481 sb->recovery_cp = 0;
1483 sb->layout = mddev->layout;
1484 sb->chunk_size = mddev->chunk_sectors << 9;
1486 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1487 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1489 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1490 rdev_for_each(rdev2, mddev) {
1493 int is_active = test_bit(In_sync, &rdev2->flags);
1495 if (rdev2->raid_disk >= 0 &&
1496 sb->minor_version >= 91)
1497 /* we have nowhere to store the recovery_offset,
1498 * but if it is not below the reshape_position,
1499 * we can piggy-back on that.
1502 if (rdev2->raid_disk < 0 ||
1503 test_bit(Faulty, &rdev2->flags))
1506 desc_nr = rdev2->raid_disk;
1508 desc_nr = next_spare++;
1509 rdev2->desc_nr = desc_nr;
1510 d = &sb->disks[rdev2->desc_nr];
1512 d->number = rdev2->desc_nr;
1513 d->major = MAJOR(rdev2->bdev->bd_dev);
1514 d->minor = MINOR(rdev2->bdev->bd_dev);
1516 d->raid_disk = rdev2->raid_disk;
1518 d->raid_disk = rdev2->desc_nr; /* compatibility */
1519 if (test_bit(Faulty, &rdev2->flags))
1520 d->state = (1<<MD_DISK_FAULTY);
1521 else if (is_active) {
1522 d->state = (1<<MD_DISK_ACTIVE);
1523 if (test_bit(In_sync, &rdev2->flags))
1524 d->state |= (1<<MD_DISK_SYNC);
1532 if (test_bit(WriteMostly, &rdev2->flags))
1533 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1534 if (test_bit(FailFast, &rdev2->flags))
1535 d->state |= (1<<MD_DISK_FAILFAST);
1537 /* now set the "removed" and "faulty" bits on any missing devices */
1538 for (i=0 ; i < mddev->raid_disks ; i++) {
1539 mdp_disk_t *d = &sb->disks[i];
1540 if (d->state == 0 && d->number == 0) {
1543 d->state = (1<<MD_DISK_REMOVED);
1544 d->state |= (1<<MD_DISK_FAULTY);
1548 sb->nr_disks = nr_disks;
1549 sb->active_disks = active;
1550 sb->working_disks = working;
1551 sb->failed_disks = failed;
1552 sb->spare_disks = spare;
1554 sb->this_disk = sb->disks[rdev->desc_nr];
1555 sb->sb_csum = calc_sb_csum(sb);
1559 * rdev_size_change for 0.90.0
1561 static unsigned long long
1562 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1564 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1565 return 0; /* component must fit device */
1566 if (rdev->mddev->bitmap_info.offset)
1567 return 0; /* can't move bitmap */
1568 rdev->sb_start = calc_dev_sboffset(rdev);
1569 if (!num_sectors || num_sectors > rdev->sb_start)
1570 num_sectors = rdev->sb_start;
1571 /* Limit to 4TB as metadata cannot record more than that.
1572 * 4TB == 2^32 KB, or 2*2^32 sectors.
1574 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1575 num_sectors = (sector_t)(2ULL << 32) - 2;
1577 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1579 } while (md_super_wait(rdev->mddev) < 0);
1584 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1586 /* non-zero offset changes not possible with v0.90 */
1587 return new_offset == 0;
1591 * version 1 superblock
1594 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1598 unsigned long long newcsum;
1599 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1600 __le32 *isuper = (__le32*)sb;
1602 disk_csum = sb->sb_csum;
1605 for (; size >= 4; size -= 4)
1606 newcsum += le32_to_cpu(*isuper++);
1609 newcsum += le16_to_cpu(*(__le16*) isuper);
1611 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1612 sb->sb_csum = disk_csum;
1613 return cpu_to_le32(csum);
1616 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1618 struct mdp_superblock_1 *sb;
1622 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1624 bool spare_disk = true;
1627 * Calculate the position of the superblock in 512byte sectors.
1628 * It is always aligned to a 4K boundary and
1629 * depeding on minor_version, it can be:
1630 * 0: At least 8K, but less than 12K, from end of device
1631 * 1: At start of device
1632 * 2: 4K from start of device.
1634 switch(minor_version) {
1636 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
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)
1792 if (minor_version) {
1793 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1794 sectors -= rdev->data_offset;
1796 sectors = rdev->sb_start;
1797 if (sectors < le64_to_cpu(sb->data_size))
1799 rdev->sectors = le64_to_cpu(sb->data_size);
1803 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1805 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1806 __u64 ev1 = le64_to_cpu(sb->events);
1808 rdev->raid_disk = -1;
1809 clear_bit(Faulty, &rdev->flags);
1810 clear_bit(In_sync, &rdev->flags);
1811 clear_bit(Bitmap_sync, &rdev->flags);
1812 clear_bit(WriteMostly, &rdev->flags);
1814 if (mddev->raid_disks == 0) {
1815 mddev->major_version = 1;
1816 mddev->patch_version = 0;
1817 mddev->external = 0;
1818 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1819 mddev->ctime = le64_to_cpu(sb->ctime);
1820 mddev->utime = le64_to_cpu(sb->utime);
1821 mddev->level = le32_to_cpu(sb->level);
1822 mddev->clevel[0] = 0;
1823 mddev->layout = le32_to_cpu(sb->layout);
1824 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1825 mddev->dev_sectors = le64_to_cpu(sb->size);
1826 mddev->events = ev1;
1827 mddev->bitmap_info.offset = 0;
1828 mddev->bitmap_info.space = 0;
1829 /* Default location for bitmap is 1K after superblock
1830 * using 3K - total of 4K
1832 mddev->bitmap_info.default_offset = 1024 >> 9;
1833 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1834 mddev->reshape_backwards = 0;
1836 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1837 memcpy(mddev->uuid, sb->set_uuid, 16);
1839 mddev->max_disks = (4096-256)/2;
1841 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1842 mddev->bitmap_info.file == NULL) {
1843 mddev->bitmap_info.offset =
1844 (__s32)le32_to_cpu(sb->bitmap_offset);
1845 /* Metadata doesn't record how much space is available.
1846 * For 1.0, we assume we can use up to the superblock
1847 * if before, else to 4K beyond superblock.
1848 * For others, assume no change is possible.
1850 if (mddev->minor_version > 0)
1851 mddev->bitmap_info.space = 0;
1852 else if (mddev->bitmap_info.offset > 0)
1853 mddev->bitmap_info.space =
1854 8 - mddev->bitmap_info.offset;
1856 mddev->bitmap_info.space =
1857 -mddev->bitmap_info.offset;
1860 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1861 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1862 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1863 mddev->new_level = le32_to_cpu(sb->new_level);
1864 mddev->new_layout = le32_to_cpu(sb->new_layout);
1865 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1866 if (mddev->delta_disks < 0 ||
1867 (mddev->delta_disks == 0 &&
1868 (le32_to_cpu(sb->feature_map)
1869 & MD_FEATURE_RESHAPE_BACKWARDS)))
1870 mddev->reshape_backwards = 1;
1872 mddev->reshape_position = MaxSector;
1873 mddev->delta_disks = 0;
1874 mddev->new_level = mddev->level;
1875 mddev->new_layout = mddev->layout;
1876 mddev->new_chunk_sectors = mddev->chunk_sectors;
1879 if (mddev->level == 0 &&
1880 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1883 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1884 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1886 if (le32_to_cpu(sb->feature_map) &
1887 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1888 if (le32_to_cpu(sb->feature_map) &
1889 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1891 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1892 (le32_to_cpu(sb->feature_map) &
1893 MD_FEATURE_MULTIPLE_PPLS))
1895 set_bit(MD_HAS_PPL, &mddev->flags);
1897 } else if (mddev->pers == NULL) {
1898 /* Insist of good event counter while assembling, except for
1899 * spares (which don't need an event count) */
1901 if (rdev->desc_nr >= 0 &&
1902 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1903 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1904 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1905 if (ev1 < mddev->events)
1907 } else if (mddev->bitmap) {
1908 /* If adding to array with a bitmap, then we can accept an
1909 * older device, but not too old.
1911 if (ev1 < mddev->bitmap->events_cleared)
1913 if (ev1 < mddev->events)
1914 set_bit(Bitmap_sync, &rdev->flags);
1916 if (ev1 < mddev->events)
1917 /* just a hot-add of a new device, leave raid_disk at -1 */
1920 if (mddev->level != LEVEL_MULTIPATH) {
1922 if (rdev->desc_nr < 0 ||
1923 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1924 role = MD_DISK_ROLE_SPARE;
1927 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1929 case MD_DISK_ROLE_SPARE: /* spare */
1931 case MD_DISK_ROLE_FAULTY: /* faulty */
1932 set_bit(Faulty, &rdev->flags);
1934 case MD_DISK_ROLE_JOURNAL: /* journal device */
1935 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1936 /* journal device without journal feature */
1937 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1940 set_bit(Journal, &rdev->flags);
1941 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1942 rdev->raid_disk = 0;
1945 rdev->saved_raid_disk = role;
1946 if ((le32_to_cpu(sb->feature_map) &
1947 MD_FEATURE_RECOVERY_OFFSET)) {
1948 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1949 if (!(le32_to_cpu(sb->feature_map) &
1950 MD_FEATURE_RECOVERY_BITMAP))
1951 rdev->saved_raid_disk = -1;
1954 * If the array is FROZEN, then the device can't
1955 * be in_sync with rest of array.
1957 if (!test_bit(MD_RECOVERY_FROZEN,
1959 set_bit(In_sync, &rdev->flags);
1961 rdev->raid_disk = role;
1964 if (sb->devflags & WriteMostly1)
1965 set_bit(WriteMostly, &rdev->flags);
1966 if (sb->devflags & FailFast1)
1967 set_bit(FailFast, &rdev->flags);
1968 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1969 set_bit(Replacement, &rdev->flags);
1970 } else /* MULTIPATH are always insync */
1971 set_bit(In_sync, &rdev->flags);
1976 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1978 struct mdp_superblock_1 *sb;
1979 struct md_rdev *rdev2;
1981 /* make rdev->sb match mddev and rdev data. */
1983 sb = page_address(rdev->sb_page);
1985 sb->feature_map = 0;
1987 sb->recovery_offset = cpu_to_le64(0);
1988 memset(sb->pad3, 0, sizeof(sb->pad3));
1990 sb->utime = cpu_to_le64((__u64)mddev->utime);
1991 sb->events = cpu_to_le64(mddev->events);
1993 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1994 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1995 sb->resync_offset = cpu_to_le64(MaxSector);
1997 sb->resync_offset = cpu_to_le64(0);
1999 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2001 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2002 sb->size = cpu_to_le64(mddev->dev_sectors);
2003 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2004 sb->level = cpu_to_le32(mddev->level);
2005 sb->layout = cpu_to_le32(mddev->layout);
2006 if (test_bit(FailFast, &rdev->flags))
2007 sb->devflags |= FailFast1;
2009 sb->devflags &= ~FailFast1;
2011 if (test_bit(WriteMostly, &rdev->flags))
2012 sb->devflags |= WriteMostly1;
2014 sb->devflags &= ~WriteMostly1;
2015 sb->data_offset = cpu_to_le64(rdev->data_offset);
2016 sb->data_size = cpu_to_le64(rdev->sectors);
2018 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2019 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2020 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2023 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2024 !test_bit(In_sync, &rdev->flags)) {
2026 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2027 sb->recovery_offset =
2028 cpu_to_le64(rdev->recovery_offset);
2029 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2031 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2033 /* Note: recovery_offset and journal_tail share space */
2034 if (test_bit(Journal, &rdev->flags))
2035 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2036 if (test_bit(Replacement, &rdev->flags))
2038 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2040 if (mddev->reshape_position != MaxSector) {
2041 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2042 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2043 sb->new_layout = cpu_to_le32(mddev->new_layout);
2044 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2045 sb->new_level = cpu_to_le32(mddev->new_level);
2046 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2047 if (mddev->delta_disks == 0 &&
2048 mddev->reshape_backwards)
2050 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2051 if (rdev->new_data_offset != rdev->data_offset) {
2053 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2054 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2055 - rdev->data_offset));
2059 if (mddev_is_clustered(mddev))
2060 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2062 if (rdev->badblocks.count == 0)
2063 /* Nothing to do for bad blocks*/ ;
2064 else if (sb->bblog_offset == 0)
2065 /* Cannot record bad blocks on this device */
2066 md_error(mddev, rdev);
2068 struct badblocks *bb = &rdev->badblocks;
2069 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2071 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2076 seq = read_seqbegin(&bb->lock);
2078 memset(bbp, 0xff, PAGE_SIZE);
2080 for (i = 0 ; i < bb->count ; i++) {
2081 u64 internal_bb = p[i];
2082 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2083 | BB_LEN(internal_bb));
2084 bbp[i] = cpu_to_le64(store_bb);
2087 if (read_seqretry(&bb->lock, seq))
2090 bb->sector = (rdev->sb_start +
2091 (int)le32_to_cpu(sb->bblog_offset));
2092 bb->size = le16_to_cpu(sb->bblog_size);
2097 rdev_for_each(rdev2, mddev)
2098 if (rdev2->desc_nr+1 > max_dev)
2099 max_dev = rdev2->desc_nr+1;
2101 if (max_dev > le32_to_cpu(sb->max_dev)) {
2103 sb->max_dev = cpu_to_le32(max_dev);
2104 rdev->sb_size = max_dev * 2 + 256;
2105 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2106 if (rdev->sb_size & bmask)
2107 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2109 max_dev = le32_to_cpu(sb->max_dev);
2111 for (i=0; i<max_dev;i++)
2112 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2114 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2115 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2117 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2118 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2120 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2122 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2123 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2124 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2127 rdev_for_each(rdev2, mddev) {
2129 if (test_bit(Faulty, &rdev2->flags))
2130 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2131 else if (test_bit(In_sync, &rdev2->flags))
2132 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2133 else if (test_bit(Journal, &rdev2->flags))
2134 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2135 else if (rdev2->raid_disk >= 0)
2136 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2138 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2141 sb->sb_csum = calc_sb_1_csum(sb);
2144 static sector_t super_1_choose_bm_space(sector_t dev_size)
2148 /* if the device is bigger than 8Gig, save 64k for bitmap
2149 * usage, if bigger than 200Gig, save 128k
2151 if (dev_size < 64*2)
2153 else if (dev_size - 64*2 >= 200*1024*1024*2)
2155 else if (dev_size - 4*2 > 8*1024*1024*2)
2162 static unsigned long long
2163 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2165 struct mdp_superblock_1 *sb;
2166 sector_t max_sectors;
2167 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2168 return 0; /* component must fit device */
2169 if (rdev->data_offset != rdev->new_data_offset)
2170 return 0; /* too confusing */
2171 if (rdev->sb_start < rdev->data_offset) {
2172 /* minor versions 1 and 2; superblock before data */
2173 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2174 max_sectors -= rdev->data_offset;
2175 if (!num_sectors || num_sectors > max_sectors)
2176 num_sectors = max_sectors;
2177 } else if (rdev->mddev->bitmap_info.offset) {
2178 /* minor version 0 with bitmap we can't move */
2181 /* minor version 0; superblock after data */
2182 sector_t sb_start, bm_space;
2183 sector_t dev_size = i_size_read(rdev->bdev->bd_inode) >> 9;
2185 /* 8K is for superblock */
2186 sb_start = dev_size - 8*2;
2187 sb_start &= ~(sector_t)(4*2 - 1);
2189 bm_space = super_1_choose_bm_space(dev_size);
2191 /* Space that can be used to store date needs to decrease
2192 * superblock bitmap space and bad block space(4K)
2194 max_sectors = sb_start - bm_space - 4*2;
2196 if (!num_sectors || num_sectors > max_sectors)
2197 num_sectors = max_sectors;
2199 sb = page_address(rdev->sb_page);
2200 sb->data_size = cpu_to_le64(num_sectors);
2201 sb->super_offset = cpu_to_le64(rdev->sb_start);
2202 sb->sb_csum = calc_sb_1_csum(sb);
2204 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2206 } while (md_super_wait(rdev->mddev) < 0);
2212 super_1_allow_new_offset(struct md_rdev *rdev,
2213 unsigned long long new_offset)
2215 /* All necessary checks on new >= old have been done */
2216 struct bitmap *bitmap;
2217 if (new_offset >= rdev->data_offset)
2220 /* with 1.0 metadata, there is no metadata to tread on
2221 * so we can always move back */
2222 if (rdev->mddev->minor_version == 0)
2225 /* otherwise we must be sure not to step on
2226 * any metadata, so stay:
2227 * 36K beyond start of superblock
2228 * beyond end of badblocks
2229 * beyond write-intent bitmap
2231 if (rdev->sb_start + (32+4)*2 > new_offset)
2233 bitmap = rdev->mddev->bitmap;
2234 if (bitmap && !rdev->mddev->bitmap_info.file &&
2235 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2236 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2238 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2244 static struct super_type super_types[] = {
2247 .owner = THIS_MODULE,
2248 .load_super = super_90_load,
2249 .validate_super = super_90_validate,
2250 .sync_super = super_90_sync,
2251 .rdev_size_change = super_90_rdev_size_change,
2252 .allow_new_offset = super_90_allow_new_offset,
2256 .owner = THIS_MODULE,
2257 .load_super = super_1_load,
2258 .validate_super = super_1_validate,
2259 .sync_super = super_1_sync,
2260 .rdev_size_change = super_1_rdev_size_change,
2261 .allow_new_offset = super_1_allow_new_offset,
2265 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2267 if (mddev->sync_super) {
2268 mddev->sync_super(mddev, rdev);
2272 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2274 super_types[mddev->major_version].sync_super(mddev, rdev);
2277 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2279 struct md_rdev *rdev, *rdev2;
2282 rdev_for_each_rcu(rdev, mddev1) {
2283 if (test_bit(Faulty, &rdev->flags) ||
2284 test_bit(Journal, &rdev->flags) ||
2285 rdev->raid_disk == -1)
2287 rdev_for_each_rcu(rdev2, mddev2) {
2288 if (test_bit(Faulty, &rdev2->flags) ||
2289 test_bit(Journal, &rdev2->flags) ||
2290 rdev2->raid_disk == -1)
2292 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2302 static LIST_HEAD(pending_raid_disks);
2305 * Try to register data integrity profile for an mddev
2307 * This is called when an array is started and after a disk has been kicked
2308 * from the array. It only succeeds if all working and active component devices
2309 * are integrity capable with matching profiles.
2311 int md_integrity_register(struct mddev *mddev)
2313 struct md_rdev *rdev, *reference = NULL;
2315 if (list_empty(&mddev->disks))
2316 return 0; /* nothing to do */
2317 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2318 return 0; /* shouldn't register, or already is */
2319 rdev_for_each(rdev, mddev) {
2320 /* skip spares and non-functional disks */
2321 if (test_bit(Faulty, &rdev->flags))
2323 if (rdev->raid_disk < 0)
2326 /* Use the first rdev as the reference */
2330 /* does this rdev's profile match the reference profile? */
2331 if (blk_integrity_compare(reference->bdev->bd_disk,
2332 rdev->bdev->bd_disk) < 0)
2335 if (!reference || !bdev_get_integrity(reference->bdev))
2338 * All component devices are integrity capable and have matching
2339 * profiles, register the common profile for the md device.
2341 blk_integrity_register(mddev->gendisk,
2342 bdev_get_integrity(reference->bdev));
2344 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2345 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2346 (mddev->level != 1 && mddev->level != 10 &&
2347 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2349 * No need to handle the failure of bioset_integrity_create,
2350 * because the function is called by md_run() -> pers->run(),
2351 * md_run calls bioset_exit -> bioset_integrity_free in case
2354 pr_err("md: failed to create integrity pool for %s\n",
2360 EXPORT_SYMBOL(md_integrity_register);
2363 * Attempt to add an rdev, but only if it is consistent with the current
2366 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2368 struct blk_integrity *bi_mddev;
2369 char name[BDEVNAME_SIZE];
2371 if (!mddev->gendisk)
2374 bi_mddev = blk_get_integrity(mddev->gendisk);
2376 if (!bi_mddev) /* nothing to do */
2379 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2380 pr_err("%s: incompatible integrity profile for %s\n",
2381 mdname(mddev), bdevname(rdev->bdev, name));
2387 EXPORT_SYMBOL(md_integrity_add_rdev);
2389 static bool rdev_read_only(struct md_rdev *rdev)
2391 return bdev_read_only(rdev->bdev) ||
2392 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2395 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2397 char b[BDEVNAME_SIZE];
2400 /* prevent duplicates */
2401 if (find_rdev(mddev, rdev->bdev->bd_dev))
2404 if (rdev_read_only(rdev) && mddev->pers)
2407 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2408 if (!test_bit(Journal, &rdev->flags) &&
2410 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2412 /* Cannot change size, so fail
2413 * If mddev->level <= 0, then we don't care
2414 * about aligning sizes (e.g. linear)
2416 if (mddev->level > 0)
2419 mddev->dev_sectors = rdev->sectors;
2422 /* Verify rdev->desc_nr is unique.
2423 * If it is -1, assign a free number, else
2424 * check number is not in use
2427 if (rdev->desc_nr < 0) {
2430 choice = mddev->raid_disks;
2431 while (md_find_rdev_nr_rcu(mddev, choice))
2433 rdev->desc_nr = choice;
2435 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2441 if (!test_bit(Journal, &rdev->flags) &&
2442 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2443 pr_warn("md: %s: array is limited to %d devices\n",
2444 mdname(mddev), mddev->max_disks);
2447 bdevname(rdev->bdev,b);
2448 strreplace(b, '/', '!');
2450 rdev->mddev = mddev;
2451 pr_debug("md: bind<%s>\n", b);
2453 if (mddev->raid_disks)
2454 mddev_create_serial_pool(mddev, rdev, false);
2456 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2459 /* failure here is OK */
2460 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2461 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2462 rdev->sysfs_unack_badblocks =
2463 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2464 rdev->sysfs_badblocks =
2465 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2467 list_add_rcu(&rdev->same_set, &mddev->disks);
2468 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2470 /* May as well allow recovery to be retried once */
2471 mddev->recovery_disabled++;
2476 pr_warn("md: failed to register dev-%s for %s\n",
2481 static void rdev_delayed_delete(struct work_struct *ws)
2483 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2484 kobject_del(&rdev->kobj);
2485 kobject_put(&rdev->kobj);
2488 static void unbind_rdev_from_array(struct md_rdev *rdev)
2490 char b[BDEVNAME_SIZE];
2492 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2493 list_del_rcu(&rdev->same_set);
2494 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2495 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2497 sysfs_remove_link(&rdev->kobj, "block");
2498 sysfs_put(rdev->sysfs_state);
2499 sysfs_put(rdev->sysfs_unack_badblocks);
2500 sysfs_put(rdev->sysfs_badblocks);
2501 rdev->sysfs_state = NULL;
2502 rdev->sysfs_unack_badblocks = NULL;
2503 rdev->sysfs_badblocks = NULL;
2504 rdev->badblocks.count = 0;
2505 /* We need to delay this, otherwise we can deadlock when
2506 * writing to 'remove' to "dev/state". We also need
2507 * to delay it due to rcu usage.
2510 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2511 kobject_get(&rdev->kobj);
2512 queue_work(md_rdev_misc_wq, &rdev->del_work);
2516 * prevent the device from being mounted, repartitioned or
2517 * otherwise reused by a RAID array (or any other kernel
2518 * subsystem), by bd_claiming the device.
2520 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2523 struct block_device *bdev;
2525 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2526 shared ? (struct md_rdev *)lock_rdev : rdev);
2528 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2529 MAJOR(dev), MINOR(dev));
2530 return PTR_ERR(bdev);
2536 static void unlock_rdev(struct md_rdev *rdev)
2538 struct block_device *bdev = rdev->bdev;
2540 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2543 void md_autodetect_dev(dev_t dev);
2545 static void export_rdev(struct md_rdev *rdev)
2547 char b[BDEVNAME_SIZE];
2549 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2550 md_rdev_clear(rdev);
2552 if (test_bit(AutoDetected, &rdev->flags))
2553 md_autodetect_dev(rdev->bdev->bd_dev);
2556 kobject_put(&rdev->kobj);
2559 void md_kick_rdev_from_array(struct md_rdev *rdev)
2561 unbind_rdev_from_array(rdev);
2564 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2566 static void export_array(struct mddev *mddev)
2568 struct md_rdev *rdev;
2570 while (!list_empty(&mddev->disks)) {
2571 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2573 md_kick_rdev_from_array(rdev);
2575 mddev->raid_disks = 0;
2576 mddev->major_version = 0;
2579 static bool set_in_sync(struct mddev *mddev)
2581 lockdep_assert_held(&mddev->lock);
2582 if (!mddev->in_sync) {
2583 mddev->sync_checkers++;
2584 spin_unlock(&mddev->lock);
2585 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2586 spin_lock(&mddev->lock);
2587 if (!mddev->in_sync &&
2588 percpu_ref_is_zero(&mddev->writes_pending)) {
2591 * Ensure ->in_sync is visible before we clear
2595 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2596 sysfs_notify_dirent_safe(mddev->sysfs_state);
2598 if (--mddev->sync_checkers == 0)
2599 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2601 if (mddev->safemode == 1)
2602 mddev->safemode = 0;
2603 return mddev->in_sync;
2606 static void sync_sbs(struct mddev *mddev, int nospares)
2608 /* Update each superblock (in-memory image), but
2609 * if we are allowed to, skip spares which already
2610 * have the right event counter, or have one earlier
2611 * (which would mean they aren't being marked as dirty
2612 * with the rest of the array)
2614 struct md_rdev *rdev;
2615 rdev_for_each(rdev, mddev) {
2616 if (rdev->sb_events == mddev->events ||
2618 rdev->raid_disk < 0 &&
2619 rdev->sb_events+1 == mddev->events)) {
2620 /* Don't update this superblock */
2621 rdev->sb_loaded = 2;
2623 sync_super(mddev, rdev);
2624 rdev->sb_loaded = 1;
2629 static bool does_sb_need_changing(struct mddev *mddev)
2631 struct md_rdev *rdev;
2632 struct mdp_superblock_1 *sb;
2635 /* Find a good rdev */
2636 rdev_for_each(rdev, mddev)
2637 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2640 /* No good device found. */
2644 sb = page_address(rdev->sb_page);
2645 /* Check if a device has become faulty or a spare become active */
2646 rdev_for_each(rdev, mddev) {
2647 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2648 /* Device activated? */
2649 if (role == 0xffff && rdev->raid_disk >=0 &&
2650 !test_bit(Faulty, &rdev->flags))
2652 /* Device turned faulty? */
2653 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2657 /* Check if any mddev parameters have changed */
2658 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2659 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2660 (mddev->layout != le32_to_cpu(sb->layout)) ||
2661 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2662 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2668 void md_update_sb(struct mddev *mddev, int force_change)
2670 struct md_rdev *rdev;
2673 int any_badblocks_changed = 0;
2678 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2683 if (mddev_is_clustered(mddev)) {
2684 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2686 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2688 ret = md_cluster_ops->metadata_update_start(mddev);
2689 /* Has someone else has updated the sb */
2690 if (!does_sb_need_changing(mddev)) {
2692 md_cluster_ops->metadata_update_cancel(mddev);
2693 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2694 BIT(MD_SB_CHANGE_DEVS) |
2695 BIT(MD_SB_CHANGE_CLEAN));
2701 * First make sure individual recovery_offsets are correct
2702 * curr_resync_completed can only be used during recovery.
2703 * During reshape/resync it might use array-addresses rather
2704 * that device addresses.
2706 rdev_for_each(rdev, mddev) {
2707 if (rdev->raid_disk >= 0 &&
2708 mddev->delta_disks >= 0 &&
2709 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2710 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2711 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2712 !test_bit(Journal, &rdev->flags) &&
2713 !test_bit(In_sync, &rdev->flags) &&
2714 mddev->curr_resync_completed > rdev->recovery_offset)
2715 rdev->recovery_offset = mddev->curr_resync_completed;
2718 if (!mddev->persistent) {
2719 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2720 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2721 if (!mddev->external) {
2722 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2723 rdev_for_each(rdev, mddev) {
2724 if (rdev->badblocks.changed) {
2725 rdev->badblocks.changed = 0;
2726 ack_all_badblocks(&rdev->badblocks);
2727 md_error(mddev, rdev);
2729 clear_bit(Blocked, &rdev->flags);
2730 clear_bit(BlockedBadBlocks, &rdev->flags);
2731 wake_up(&rdev->blocked_wait);
2734 wake_up(&mddev->sb_wait);
2738 spin_lock(&mddev->lock);
2740 mddev->utime = ktime_get_real_seconds();
2742 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2744 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2745 /* just a clean<-> dirty transition, possibly leave spares alone,
2746 * though if events isn't the right even/odd, we will have to do
2752 if (mddev->degraded)
2753 /* If the array is degraded, then skipping spares is both
2754 * dangerous and fairly pointless.
2755 * Dangerous because a device that was removed from the array
2756 * might have a event_count that still looks up-to-date,
2757 * so it can be re-added without a resync.
2758 * Pointless because if there are any spares to skip,
2759 * then a recovery will happen and soon that array won't
2760 * be degraded any more and the spare can go back to sleep then.
2764 sync_req = mddev->in_sync;
2766 /* If this is just a dirty<->clean transition, and the array is clean
2767 * and 'events' is odd, we can roll back to the previous clean state */
2769 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2770 && mddev->can_decrease_events
2771 && mddev->events != 1) {
2773 mddev->can_decrease_events = 0;
2775 /* otherwise we have to go forward and ... */
2777 mddev->can_decrease_events = nospares;
2781 * This 64-bit counter should never wrap.
2782 * Either we are in around ~1 trillion A.C., assuming
2783 * 1 reboot per second, or we have a bug...
2785 WARN_ON(mddev->events == 0);
2787 rdev_for_each(rdev, mddev) {
2788 if (rdev->badblocks.changed)
2789 any_badblocks_changed++;
2790 if (test_bit(Faulty, &rdev->flags))
2791 set_bit(FaultRecorded, &rdev->flags);
2794 sync_sbs(mddev, nospares);
2795 spin_unlock(&mddev->lock);
2797 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2798 mdname(mddev), mddev->in_sync);
2801 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2803 md_bitmap_update_sb(mddev->bitmap);
2804 rdev_for_each(rdev, mddev) {
2805 char b[BDEVNAME_SIZE];
2807 if (rdev->sb_loaded != 1)
2808 continue; /* no noise on spare devices */
2810 if (!test_bit(Faulty, &rdev->flags)) {
2811 md_super_write(mddev,rdev,
2812 rdev->sb_start, rdev->sb_size,
2814 pr_debug("md: (write) %s's sb offset: %llu\n",
2815 bdevname(rdev->bdev, b),
2816 (unsigned long long)rdev->sb_start);
2817 rdev->sb_events = mddev->events;
2818 if (rdev->badblocks.size) {
2819 md_super_write(mddev, rdev,
2820 rdev->badblocks.sector,
2821 rdev->badblocks.size << 9,
2823 rdev->badblocks.size = 0;
2827 pr_debug("md: %s (skipping faulty)\n",
2828 bdevname(rdev->bdev, b));
2830 if (mddev->level == LEVEL_MULTIPATH)
2831 /* only need to write one superblock... */
2834 if (md_super_wait(mddev) < 0)
2836 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2838 if (mddev_is_clustered(mddev) && ret == 0)
2839 md_cluster_ops->metadata_update_finish(mddev);
2841 if (mddev->in_sync != sync_req ||
2842 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2843 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2844 /* have to write it out again */
2846 wake_up(&mddev->sb_wait);
2847 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2848 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2850 rdev_for_each(rdev, mddev) {
2851 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2852 clear_bit(Blocked, &rdev->flags);
2854 if (any_badblocks_changed)
2855 ack_all_badblocks(&rdev->badblocks);
2856 clear_bit(BlockedBadBlocks, &rdev->flags);
2857 wake_up(&rdev->blocked_wait);
2860 EXPORT_SYMBOL(md_update_sb);
2862 static int add_bound_rdev(struct md_rdev *rdev)
2864 struct mddev *mddev = rdev->mddev;
2866 bool add_journal = test_bit(Journal, &rdev->flags);
2868 if (!mddev->pers->hot_remove_disk || add_journal) {
2869 /* If there is hot_add_disk but no hot_remove_disk
2870 * then added disks for geometry changes,
2871 * and should be added immediately.
2873 super_types[mddev->major_version].
2874 validate_super(mddev, rdev);
2876 mddev_suspend(mddev);
2877 err = mddev->pers->hot_add_disk(mddev, rdev);
2879 mddev_resume(mddev);
2881 md_kick_rdev_from_array(rdev);
2885 sysfs_notify_dirent_safe(rdev->sysfs_state);
2887 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2888 if (mddev->degraded)
2889 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2890 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2891 md_new_event(mddev);
2892 md_wakeup_thread(mddev->thread);
2896 /* words written to sysfs files may, or may not, be \n terminated.
2897 * We want to accept with case. For this we use cmd_match.
2899 static int cmd_match(const char *cmd, const char *str)
2901 /* See if cmd, written into a sysfs file, matches
2902 * str. They must either be the same, or cmd can
2903 * have a trailing newline
2905 while (*cmd && *str && *cmd == *str) {
2916 struct rdev_sysfs_entry {
2917 struct attribute attr;
2918 ssize_t (*show)(struct md_rdev *, char *);
2919 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2923 state_show(struct md_rdev *rdev, char *page)
2927 unsigned long flags = READ_ONCE(rdev->flags);
2929 if (test_bit(Faulty, &flags) ||
2930 (!test_bit(ExternalBbl, &flags) &&
2931 rdev->badblocks.unacked_exist))
2932 len += sprintf(page+len, "faulty%s", sep);
2933 if (test_bit(In_sync, &flags))
2934 len += sprintf(page+len, "in_sync%s", sep);
2935 if (test_bit(Journal, &flags))
2936 len += sprintf(page+len, "journal%s", sep);
2937 if (test_bit(WriteMostly, &flags))
2938 len += sprintf(page+len, "write_mostly%s", sep);
2939 if (test_bit(Blocked, &flags) ||
2940 (rdev->badblocks.unacked_exist
2941 && !test_bit(Faulty, &flags)))
2942 len += sprintf(page+len, "blocked%s", sep);
2943 if (!test_bit(Faulty, &flags) &&
2944 !test_bit(Journal, &flags) &&
2945 !test_bit(In_sync, &flags))
2946 len += sprintf(page+len, "spare%s", sep);
2947 if (test_bit(WriteErrorSeen, &flags))
2948 len += sprintf(page+len, "write_error%s", sep);
2949 if (test_bit(WantReplacement, &flags))
2950 len += sprintf(page+len, "want_replacement%s", sep);
2951 if (test_bit(Replacement, &flags))
2952 len += sprintf(page+len, "replacement%s", sep);
2953 if (test_bit(ExternalBbl, &flags))
2954 len += sprintf(page+len, "external_bbl%s", sep);
2955 if (test_bit(FailFast, &flags))
2956 len += sprintf(page+len, "failfast%s", sep);
2961 return len+sprintf(page+len, "\n");
2965 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2968 * faulty - simulates an error
2969 * remove - disconnects the device
2970 * writemostly - sets write_mostly
2971 * -writemostly - clears write_mostly
2972 * blocked - sets the Blocked flags
2973 * -blocked - clears the Blocked and possibly simulates an error
2974 * insync - sets Insync providing device isn't active
2975 * -insync - clear Insync for a device with a slot assigned,
2976 * so that it gets rebuilt based on bitmap
2977 * write_error - sets WriteErrorSeen
2978 * -write_error - clears WriteErrorSeen
2979 * {,-}failfast - set/clear FailFast
2982 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2983 md_error(rdev->mddev, rdev);
2984 if (test_bit(Faulty, &rdev->flags))
2988 } else if (cmd_match(buf, "remove")) {
2989 if (rdev->mddev->pers) {
2990 clear_bit(Blocked, &rdev->flags);
2991 remove_and_add_spares(rdev->mddev, rdev);
2993 if (rdev->raid_disk >= 0)
2996 struct mddev *mddev = rdev->mddev;
2998 if (mddev_is_clustered(mddev))
2999 err = md_cluster_ops->remove_disk(mddev, rdev);
3002 md_kick_rdev_from_array(rdev);
3004 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3005 md_wakeup_thread(mddev->thread);
3007 md_new_event(mddev);
3010 } else if (cmd_match(buf, "writemostly")) {
3011 set_bit(WriteMostly, &rdev->flags);
3012 mddev_create_serial_pool(rdev->mddev, rdev, false);
3014 } else if (cmd_match(buf, "-writemostly")) {
3015 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3016 clear_bit(WriteMostly, &rdev->flags);
3018 } else if (cmd_match(buf, "blocked")) {
3019 set_bit(Blocked, &rdev->flags);
3021 } else if (cmd_match(buf, "-blocked")) {
3022 if (!test_bit(Faulty, &rdev->flags) &&
3023 !test_bit(ExternalBbl, &rdev->flags) &&
3024 rdev->badblocks.unacked_exist) {
3025 /* metadata handler doesn't understand badblocks,
3026 * so we need to fail the device
3028 md_error(rdev->mddev, rdev);
3030 clear_bit(Blocked, &rdev->flags);
3031 clear_bit(BlockedBadBlocks, &rdev->flags);
3032 wake_up(&rdev->blocked_wait);
3033 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3034 md_wakeup_thread(rdev->mddev->thread);
3037 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3038 set_bit(In_sync, &rdev->flags);
3040 } else if (cmd_match(buf, "failfast")) {
3041 set_bit(FailFast, &rdev->flags);
3043 } else if (cmd_match(buf, "-failfast")) {
3044 clear_bit(FailFast, &rdev->flags);
3046 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3047 !test_bit(Journal, &rdev->flags)) {
3048 if (rdev->mddev->pers == NULL) {
3049 clear_bit(In_sync, &rdev->flags);
3050 rdev->saved_raid_disk = rdev->raid_disk;
3051 rdev->raid_disk = -1;
3054 } else if (cmd_match(buf, "write_error")) {
3055 set_bit(WriteErrorSeen, &rdev->flags);
3057 } else if (cmd_match(buf, "-write_error")) {
3058 clear_bit(WriteErrorSeen, &rdev->flags);
3060 } else if (cmd_match(buf, "want_replacement")) {
3061 /* Any non-spare device that is not a replacement can
3062 * become want_replacement at any time, but we then need to
3063 * check if recovery is needed.
3065 if (rdev->raid_disk >= 0 &&
3066 !test_bit(Journal, &rdev->flags) &&
3067 !test_bit(Replacement, &rdev->flags))
3068 set_bit(WantReplacement, &rdev->flags);
3069 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3070 md_wakeup_thread(rdev->mddev->thread);
3072 } else if (cmd_match(buf, "-want_replacement")) {
3073 /* Clearing 'want_replacement' is always allowed.
3074 * Once replacements starts it is too late though.
3077 clear_bit(WantReplacement, &rdev->flags);
3078 } else if (cmd_match(buf, "replacement")) {
3079 /* Can only set a device as a replacement when array has not
3080 * yet been started. Once running, replacement is automatic
3081 * from spares, or by assigning 'slot'.
3083 if (rdev->mddev->pers)
3086 set_bit(Replacement, &rdev->flags);
3089 } else if (cmd_match(buf, "-replacement")) {
3090 /* Similarly, can only clear Replacement before start */
3091 if (rdev->mddev->pers)
3094 clear_bit(Replacement, &rdev->flags);
3097 } else if (cmd_match(buf, "re-add")) {
3098 if (!rdev->mddev->pers)
3100 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3101 rdev->saved_raid_disk >= 0) {
3102 /* clear_bit is performed _after_ all the devices
3103 * have their local Faulty bit cleared. If any writes
3104 * happen in the meantime in the local node, they
3105 * will land in the local bitmap, which will be synced
3106 * by this node eventually
3108 if (!mddev_is_clustered(rdev->mddev) ||
3109 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3110 clear_bit(Faulty, &rdev->flags);
3111 err = add_bound_rdev(rdev);
3115 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3116 set_bit(ExternalBbl, &rdev->flags);
3117 rdev->badblocks.shift = 0;
3119 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3120 clear_bit(ExternalBbl, &rdev->flags);
3124 sysfs_notify_dirent_safe(rdev->sysfs_state);
3125 return err ? err : len;
3127 static struct rdev_sysfs_entry rdev_state =
3128 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3131 errors_show(struct md_rdev *rdev, char *page)
3133 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3137 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3142 rv = kstrtouint(buf, 10, &n);
3145 atomic_set(&rdev->corrected_errors, n);
3148 static struct rdev_sysfs_entry rdev_errors =
3149 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3152 slot_show(struct md_rdev *rdev, char *page)
3154 if (test_bit(Journal, &rdev->flags))
3155 return sprintf(page, "journal\n");
3156 else if (rdev->raid_disk < 0)
3157 return sprintf(page, "none\n");
3159 return sprintf(page, "%d\n", rdev->raid_disk);
3163 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3168 if (test_bit(Journal, &rdev->flags))
3170 if (strncmp(buf, "none", 4)==0)
3173 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3177 if (rdev->mddev->pers && slot == -1) {
3178 /* Setting 'slot' on an active array requires also
3179 * updating the 'rd%d' link, and communicating
3180 * with the personality with ->hot_*_disk.
3181 * For now we only support removing
3182 * failed/spare devices. This normally happens automatically,
3183 * but not when the metadata is externally managed.
3185 if (rdev->raid_disk == -1)
3187 /* personality does all needed checks */
3188 if (rdev->mddev->pers->hot_remove_disk == NULL)
3190 clear_bit(Blocked, &rdev->flags);
3191 remove_and_add_spares(rdev->mddev, rdev);
3192 if (rdev->raid_disk >= 0)
3194 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3195 md_wakeup_thread(rdev->mddev->thread);
3196 } else if (rdev->mddev->pers) {
3197 /* Activating a spare .. or possibly reactivating
3198 * if we ever get bitmaps working here.
3202 if (rdev->raid_disk != -1)
3205 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3208 if (rdev->mddev->pers->hot_add_disk == NULL)
3211 if (slot >= rdev->mddev->raid_disks &&
3212 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3215 rdev->raid_disk = slot;
3216 if (test_bit(In_sync, &rdev->flags))
3217 rdev->saved_raid_disk = slot;
3219 rdev->saved_raid_disk = -1;
3220 clear_bit(In_sync, &rdev->flags);
3221 clear_bit(Bitmap_sync, &rdev->flags);
3222 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3224 rdev->raid_disk = -1;
3227 sysfs_notify_dirent_safe(rdev->sysfs_state);
3228 /* failure here is OK */;
3229 sysfs_link_rdev(rdev->mddev, rdev);
3230 /* don't wakeup anyone, leave that to userspace. */
3232 if (slot >= rdev->mddev->raid_disks &&
3233 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3235 rdev->raid_disk = slot;
3236 /* assume it is working */
3237 clear_bit(Faulty, &rdev->flags);
3238 clear_bit(WriteMostly, &rdev->flags);
3239 set_bit(In_sync, &rdev->flags);
3240 sysfs_notify_dirent_safe(rdev->sysfs_state);
3245 static struct rdev_sysfs_entry rdev_slot =
3246 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3249 offset_show(struct md_rdev *rdev, char *page)
3251 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3255 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3257 unsigned long long offset;
3258 if (kstrtoull(buf, 10, &offset) < 0)
3260 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3262 if (rdev->sectors && rdev->mddev->external)
3263 /* Must set offset before size, so overlap checks
3266 rdev->data_offset = offset;
3267 rdev->new_data_offset = offset;
3271 static struct rdev_sysfs_entry rdev_offset =
3272 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3274 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3276 return sprintf(page, "%llu\n",
3277 (unsigned long long)rdev->new_data_offset);
3280 static ssize_t new_offset_store(struct md_rdev *rdev,
3281 const char *buf, size_t len)
3283 unsigned long long new_offset;
3284 struct mddev *mddev = rdev->mddev;
3286 if (kstrtoull(buf, 10, &new_offset) < 0)
3289 if (mddev->sync_thread ||
3290 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3292 if (new_offset == rdev->data_offset)
3293 /* reset is always permitted */
3295 else if (new_offset > rdev->data_offset) {
3296 /* must not push array size beyond rdev_sectors */
3297 if (new_offset - rdev->data_offset
3298 + mddev->dev_sectors > rdev->sectors)
3301 /* Metadata worries about other space details. */
3303 /* decreasing the offset is inconsistent with a backwards
3306 if (new_offset < rdev->data_offset &&
3307 mddev->reshape_backwards)
3309 /* Increasing offset is inconsistent with forwards
3310 * reshape. reshape_direction should be set to
3311 * 'backwards' first.
3313 if (new_offset > rdev->data_offset &&
3314 !mddev->reshape_backwards)
3317 if (mddev->pers && mddev->persistent &&
3318 !super_types[mddev->major_version]
3319 .allow_new_offset(rdev, new_offset))
3321 rdev->new_data_offset = new_offset;
3322 if (new_offset > rdev->data_offset)
3323 mddev->reshape_backwards = 1;
3324 else if (new_offset < rdev->data_offset)
3325 mddev->reshape_backwards = 0;
3329 static struct rdev_sysfs_entry rdev_new_offset =
3330 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3333 rdev_size_show(struct md_rdev *rdev, char *page)
3335 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3338 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3340 /* check if two start/length pairs overlap */
3348 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3350 unsigned long long blocks;
3353 if (kstrtoull(buf, 10, &blocks) < 0)
3356 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3357 return -EINVAL; /* sector conversion overflow */
3360 if (new != blocks * 2)
3361 return -EINVAL; /* unsigned long long to sector_t overflow */
3368 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3370 struct mddev *my_mddev = rdev->mddev;
3371 sector_t oldsectors = rdev->sectors;
3374 if (test_bit(Journal, &rdev->flags))
3376 if (strict_blocks_to_sectors(buf, §ors) < 0)
3378 if (rdev->data_offset != rdev->new_data_offset)
3379 return -EINVAL; /* too confusing */
3380 if (my_mddev->pers && rdev->raid_disk >= 0) {
3381 if (my_mddev->persistent) {
3382 sectors = super_types[my_mddev->major_version].
3383 rdev_size_change(rdev, sectors);
3386 } else if (!sectors)
3387 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3389 if (!my_mddev->pers->resize)
3390 /* Cannot change size for RAID0 or Linear etc */
3393 if (sectors < my_mddev->dev_sectors)
3394 return -EINVAL; /* component must fit device */
3396 rdev->sectors = sectors;
3397 if (sectors > oldsectors && my_mddev->external) {
3398 /* Need to check that all other rdevs with the same
3399 * ->bdev do not overlap. 'rcu' is sufficient to walk
3400 * the rdev lists safely.
3401 * This check does not provide a hard guarantee, it
3402 * just helps avoid dangerous mistakes.
3404 struct mddev *mddev;
3406 struct list_head *tmp;
3409 for_each_mddev(mddev, tmp) {
3410 struct md_rdev *rdev2;
3412 rdev_for_each(rdev2, mddev)
3413 if (rdev->bdev == rdev2->bdev &&
3415 overlaps(rdev->data_offset, rdev->sectors,
3428 /* Someone else could have slipped in a size
3429 * change here, but doing so is just silly.
3430 * We put oldsectors back because we *know* it is
3431 * safe, and trust userspace not to race with
3434 rdev->sectors = oldsectors;
3441 static struct rdev_sysfs_entry rdev_size =
3442 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3444 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3446 unsigned long long recovery_start = rdev->recovery_offset;
3448 if (test_bit(In_sync, &rdev->flags) ||
3449 recovery_start == MaxSector)
3450 return sprintf(page, "none\n");
3452 return sprintf(page, "%llu\n", recovery_start);
3455 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3457 unsigned long long recovery_start;
3459 if (cmd_match(buf, "none"))
3460 recovery_start = MaxSector;
3461 else if (kstrtoull(buf, 10, &recovery_start))
3464 if (rdev->mddev->pers &&
3465 rdev->raid_disk >= 0)
3468 rdev->recovery_offset = recovery_start;
3469 if (recovery_start == MaxSector)
3470 set_bit(In_sync, &rdev->flags);
3472 clear_bit(In_sync, &rdev->flags);
3476 static struct rdev_sysfs_entry rdev_recovery_start =
3477 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3479 /* sysfs access to bad-blocks list.
3480 * We present two files.
3481 * 'bad-blocks' lists sector numbers and lengths of ranges that
3482 * are recorded as bad. The list is truncated to fit within
3483 * the one-page limit of sysfs.
3484 * Writing "sector length" to this file adds an acknowledged
3486 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3487 * been acknowledged. Writing to this file adds bad blocks
3488 * without acknowledging them. This is largely for testing.
3490 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3492 return badblocks_show(&rdev->badblocks, page, 0);
3494 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3496 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3497 /* Maybe that ack was all we needed */
3498 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3499 wake_up(&rdev->blocked_wait);
3502 static struct rdev_sysfs_entry rdev_bad_blocks =
3503 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3505 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3507 return badblocks_show(&rdev->badblocks, page, 1);
3509 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3511 return badblocks_store(&rdev->badblocks, page, len, 1);
3513 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3514 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3517 ppl_sector_show(struct md_rdev *rdev, char *page)
3519 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3523 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3525 unsigned long long sector;
3527 if (kstrtoull(buf, 10, §or) < 0)
3529 if (sector != (sector_t)sector)
3532 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3533 rdev->raid_disk >= 0)
3536 if (rdev->mddev->persistent) {
3537 if (rdev->mddev->major_version == 0)
3539 if ((sector > rdev->sb_start &&
3540 sector - rdev->sb_start > S16_MAX) ||
3541 (sector < rdev->sb_start &&
3542 rdev->sb_start - sector > -S16_MIN))
3544 rdev->ppl.offset = sector - rdev->sb_start;
3545 } else if (!rdev->mddev->external) {
3548 rdev->ppl.sector = sector;
3552 static struct rdev_sysfs_entry rdev_ppl_sector =
3553 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3556 ppl_size_show(struct md_rdev *rdev, char *page)
3558 return sprintf(page, "%u\n", rdev->ppl.size);
3562 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3566 if (kstrtouint(buf, 10, &size) < 0)
3569 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3570 rdev->raid_disk >= 0)
3573 if (rdev->mddev->persistent) {
3574 if (rdev->mddev->major_version == 0)
3578 } else if (!rdev->mddev->external) {
3581 rdev->ppl.size = size;
3585 static struct rdev_sysfs_entry rdev_ppl_size =
3586 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3588 static struct attribute *rdev_default_attrs[] = {
3593 &rdev_new_offset.attr,
3595 &rdev_recovery_start.attr,
3596 &rdev_bad_blocks.attr,
3597 &rdev_unack_bad_blocks.attr,
3598 &rdev_ppl_sector.attr,
3599 &rdev_ppl_size.attr,
3603 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3605 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3606 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3612 return entry->show(rdev, page);
3616 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3617 const char *page, size_t length)
3619 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3620 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3622 struct mddev *mddev = rdev->mddev;
3626 if (!capable(CAP_SYS_ADMIN))
3628 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3630 if (rdev->mddev == NULL)
3633 rv = entry->store(rdev, page, length);
3634 mddev_unlock(mddev);
3639 static void rdev_free(struct kobject *ko)
3641 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3644 static const struct sysfs_ops rdev_sysfs_ops = {
3645 .show = rdev_attr_show,
3646 .store = rdev_attr_store,
3648 static struct kobj_type rdev_ktype = {
3649 .release = rdev_free,
3650 .sysfs_ops = &rdev_sysfs_ops,
3651 .default_attrs = rdev_default_attrs,
3654 int md_rdev_init(struct md_rdev *rdev)
3657 rdev->saved_raid_disk = -1;
3658 rdev->raid_disk = -1;
3660 rdev->data_offset = 0;
3661 rdev->new_data_offset = 0;
3662 rdev->sb_events = 0;
3663 rdev->last_read_error = 0;
3664 rdev->sb_loaded = 0;
3665 rdev->bb_page = NULL;
3666 atomic_set(&rdev->nr_pending, 0);
3667 atomic_set(&rdev->read_errors, 0);
3668 atomic_set(&rdev->corrected_errors, 0);
3670 INIT_LIST_HEAD(&rdev->same_set);
3671 init_waitqueue_head(&rdev->blocked_wait);
3673 /* Add space to store bad block list.
3674 * This reserves the space even on arrays where it cannot
3675 * be used - I wonder if that matters
3677 return badblocks_init(&rdev->badblocks, 0);
3679 EXPORT_SYMBOL_GPL(md_rdev_init);
3681 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3683 * mark the device faulty if:
3685 * - the device is nonexistent (zero size)
3686 * - the device has no valid superblock
3688 * a faulty rdev _never_ has rdev->sb set.
3690 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3692 char b[BDEVNAME_SIZE];
3694 struct md_rdev *rdev;
3697 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3699 return ERR_PTR(-ENOMEM);
3701 err = md_rdev_init(rdev);
3704 err = alloc_disk_sb(rdev);
3708 err = lock_rdev(rdev, newdev, super_format == -2);
3712 kobject_init(&rdev->kobj, &rdev_ktype);
3714 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3716 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3717 bdevname(rdev->bdev,b));
3722 if (super_format >= 0) {
3723 err = super_types[super_format].
3724 load_super(rdev, NULL, super_minor);
3725 if (err == -EINVAL) {
3726 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3727 bdevname(rdev->bdev,b),
3728 super_format, super_minor);
3732 pr_warn("md: could not read %s's sb, not importing!\n",
3733 bdevname(rdev->bdev,b));
3743 md_rdev_clear(rdev);
3745 return ERR_PTR(err);
3749 * Check a full RAID array for plausibility
3752 static int analyze_sbs(struct mddev *mddev)
3755 struct md_rdev *rdev, *freshest, *tmp;
3756 char b[BDEVNAME_SIZE];
3759 rdev_for_each_safe(rdev, tmp, mddev)
3760 switch (super_types[mddev->major_version].
3761 load_super(rdev, freshest, mddev->minor_version)) {
3768 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3769 bdevname(rdev->bdev,b));
3770 md_kick_rdev_from_array(rdev);
3773 /* Cannot find a valid fresh disk */
3775 pr_warn("md: cannot find a valid disk\n");
3779 super_types[mddev->major_version].
3780 validate_super(mddev, freshest);
3783 rdev_for_each_safe(rdev, tmp, mddev) {
3784 if (mddev->max_disks &&
3785 (rdev->desc_nr >= mddev->max_disks ||
3786 i > mddev->max_disks)) {
3787 pr_warn("md: %s: %s: only %d devices permitted\n",
3788 mdname(mddev), bdevname(rdev->bdev, b),
3790 md_kick_rdev_from_array(rdev);
3793 if (rdev != freshest) {
3794 if (super_types[mddev->major_version].
3795 validate_super(mddev, rdev)) {
3796 pr_warn("md: kicking non-fresh %s from array!\n",
3797 bdevname(rdev->bdev,b));
3798 md_kick_rdev_from_array(rdev);
3802 if (mddev->level == LEVEL_MULTIPATH) {
3803 rdev->desc_nr = i++;
3804 rdev->raid_disk = rdev->desc_nr;
3805 set_bit(In_sync, &rdev->flags);
3806 } else if (rdev->raid_disk >=
3807 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3808 !test_bit(Journal, &rdev->flags)) {
3809 rdev->raid_disk = -1;
3810 clear_bit(In_sync, &rdev->flags);
3817 /* Read a fixed-point number.
3818 * Numbers in sysfs attributes should be in "standard" units where
3819 * possible, so time should be in seconds.
3820 * However we internally use a a much smaller unit such as
3821 * milliseconds or jiffies.
3822 * This function takes a decimal number with a possible fractional
3823 * component, and produces an integer which is the result of
3824 * multiplying that number by 10^'scale'.
3825 * all without any floating-point arithmetic.
3827 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3829 unsigned long result = 0;
3831 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3834 else if (decimals < scale) {
3837 result = result * 10 + value;
3849 *res = result * int_pow(10, scale - decimals);
3854 safe_delay_show(struct mddev *mddev, char *page)
3856 int msec = (mddev->safemode_delay*1000)/HZ;
3857 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3860 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3864 if (mddev_is_clustered(mddev)) {
3865 pr_warn("md: Safemode is disabled for clustered mode\n");
3869 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3872 mddev->safemode_delay = 0;
3874 unsigned long old_delay = mddev->safemode_delay;
3875 unsigned long new_delay = (msec*HZ)/1000;
3879 mddev->safemode_delay = new_delay;
3880 if (new_delay < old_delay || old_delay == 0)
3881 mod_timer(&mddev->safemode_timer, jiffies+1);
3885 static struct md_sysfs_entry md_safe_delay =
3886 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3889 level_show(struct mddev *mddev, char *page)
3891 struct md_personality *p;
3893 spin_lock(&mddev->lock);
3896 ret = sprintf(page, "%s\n", p->name);
3897 else if (mddev->clevel[0])
3898 ret = sprintf(page, "%s\n", mddev->clevel);
3899 else if (mddev->level != LEVEL_NONE)
3900 ret = sprintf(page, "%d\n", mddev->level);
3903 spin_unlock(&mddev->lock);
3908 level_store(struct mddev *mddev, const char *buf, size_t len)
3913 struct md_personality *pers, *oldpers;
3915 void *priv, *oldpriv;
3916 struct md_rdev *rdev;
3918 if (slen == 0 || slen >= sizeof(clevel))
3921 rv = mddev_lock(mddev);
3925 if (mddev->pers == NULL) {
3926 strncpy(mddev->clevel, buf, slen);
3927 if (mddev->clevel[slen-1] == '\n')
3929 mddev->clevel[slen] = 0;
3930 mddev->level = LEVEL_NONE;
3938 /* request to change the personality. Need to ensure:
3939 * - array is not engaged in resync/recovery/reshape
3940 * - old personality can be suspended
3941 * - new personality will access other array.
3945 if (mddev->sync_thread ||
3946 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3947 mddev->reshape_position != MaxSector ||
3948 mddev->sysfs_active)
3952 if (!mddev->pers->quiesce) {
3953 pr_warn("md: %s: %s does not support online personality change\n",
3954 mdname(mddev), mddev->pers->name);
3958 /* Now find the new personality */
3959 strncpy(clevel, buf, slen);
3960 if (clevel[slen-1] == '\n')
3963 if (kstrtol(clevel, 10, &level))
3966 if (request_module("md-%s", clevel) != 0)
3967 request_module("md-level-%s", clevel);
3968 spin_lock(&pers_lock);
3969 pers = find_pers(level, clevel);
3970 if (!pers || !try_module_get(pers->owner)) {
3971 spin_unlock(&pers_lock);
3972 pr_warn("md: personality %s not loaded\n", clevel);
3976 spin_unlock(&pers_lock);
3978 if (pers == mddev->pers) {
3979 /* Nothing to do! */
3980 module_put(pers->owner);
3984 if (!pers->takeover) {
3985 module_put(pers->owner);
3986 pr_warn("md: %s: %s does not support personality takeover\n",
3987 mdname(mddev), clevel);
3992 rdev_for_each(rdev, mddev)
3993 rdev->new_raid_disk = rdev->raid_disk;
3995 /* ->takeover must set new_* and/or delta_disks
3996 * if it succeeds, and may set them when it fails.
3998 priv = pers->takeover(mddev);
4000 mddev->new_level = mddev->level;
4001 mddev->new_layout = mddev->layout;
4002 mddev->new_chunk_sectors = mddev->chunk_sectors;
4003 mddev->raid_disks -= mddev->delta_disks;
4004 mddev->delta_disks = 0;
4005 mddev->reshape_backwards = 0;
4006 module_put(pers->owner);
4007 pr_warn("md: %s: %s would not accept array\n",
4008 mdname(mddev), clevel);
4013 /* Looks like we have a winner */
4014 mddev_suspend(mddev);
4015 mddev_detach(mddev);
4017 spin_lock(&mddev->lock);
4018 oldpers = mddev->pers;
4019 oldpriv = mddev->private;
4021 mddev->private = priv;
4022 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4023 mddev->level = mddev->new_level;
4024 mddev->layout = mddev->new_layout;
4025 mddev->chunk_sectors = mddev->new_chunk_sectors;
4026 mddev->delta_disks = 0;
4027 mddev->reshape_backwards = 0;
4028 mddev->degraded = 0;
4029 spin_unlock(&mddev->lock);
4031 if (oldpers->sync_request == NULL &&
4033 /* We are converting from a no-redundancy array
4034 * to a redundancy array and metadata is managed
4035 * externally so we need to be sure that writes
4036 * won't block due to a need to transition
4038 * until external management is started.
4041 mddev->safemode_delay = 0;
4042 mddev->safemode = 0;
4045 oldpers->free(mddev, oldpriv);
4047 if (oldpers->sync_request == NULL &&
4048 pers->sync_request != NULL) {
4049 /* need to add the md_redundancy_group */
4050 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4051 pr_warn("md: cannot register extra attributes for %s\n",
4053 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4054 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4055 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4057 if (oldpers->sync_request != NULL &&
4058 pers->sync_request == NULL) {
4059 /* need to remove the md_redundancy_group */
4060 if (mddev->to_remove == NULL)
4061 mddev->to_remove = &md_redundancy_group;
4064 module_put(oldpers->owner);
4066 rdev_for_each(rdev, mddev) {
4067 if (rdev->raid_disk < 0)
4069 if (rdev->new_raid_disk >= mddev->raid_disks)
4070 rdev->new_raid_disk = -1;
4071 if (rdev->new_raid_disk == rdev->raid_disk)
4073 sysfs_unlink_rdev(mddev, rdev);
4075 rdev_for_each(rdev, mddev) {
4076 if (rdev->raid_disk < 0)
4078 if (rdev->new_raid_disk == rdev->raid_disk)
4080 rdev->raid_disk = rdev->new_raid_disk;
4081 if (rdev->raid_disk < 0)
4082 clear_bit(In_sync, &rdev->flags);
4084 if (sysfs_link_rdev(mddev, rdev))
4085 pr_warn("md: cannot register rd%d for %s after level change\n",
4086 rdev->raid_disk, mdname(mddev));
4090 if (pers->sync_request == NULL) {
4091 /* this is now an array without redundancy, so
4092 * it must always be in_sync
4095 del_timer_sync(&mddev->safemode_timer);
4097 blk_set_stacking_limits(&mddev->queue->limits);
4099 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4100 mddev_resume(mddev);
4102 md_update_sb(mddev, 1);
4103 sysfs_notify_dirent_safe(mddev->sysfs_level);
4104 md_new_event(mddev);
4107 mddev_unlock(mddev);
4111 static struct md_sysfs_entry md_level =
4112 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4115 layout_show(struct mddev *mddev, char *page)
4117 /* just a number, not meaningful for all levels */
4118 if (mddev->reshape_position != MaxSector &&
4119 mddev->layout != mddev->new_layout)
4120 return sprintf(page, "%d (%d)\n",
4121 mddev->new_layout, mddev->layout);
4122 return sprintf(page, "%d\n", mddev->layout);
4126 layout_store(struct mddev *mddev, const char *buf, size_t len)
4131 err = kstrtouint(buf, 10, &n);
4134 err = mddev_lock(mddev);
4139 if (mddev->pers->check_reshape == NULL)
4144 mddev->new_layout = n;
4145 err = mddev->pers->check_reshape(mddev);
4147 mddev->new_layout = mddev->layout;
4150 mddev->new_layout = n;
4151 if (mddev->reshape_position == MaxSector)
4154 mddev_unlock(mddev);
4157 static struct md_sysfs_entry md_layout =
4158 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4161 raid_disks_show(struct mddev *mddev, char *page)
4163 if (mddev->raid_disks == 0)
4165 if (mddev->reshape_position != MaxSector &&
4166 mddev->delta_disks != 0)
4167 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4168 mddev->raid_disks - mddev->delta_disks);
4169 return sprintf(page, "%d\n", mddev->raid_disks);
4172 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4175 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4180 err = kstrtouint(buf, 10, &n);
4184 err = mddev_lock(mddev);
4188 err = update_raid_disks(mddev, n);
4189 else if (mddev->reshape_position != MaxSector) {
4190 struct md_rdev *rdev;
4191 int olddisks = mddev->raid_disks - mddev->delta_disks;
4194 rdev_for_each(rdev, mddev) {
4196 rdev->data_offset < rdev->new_data_offset)
4199 rdev->data_offset > rdev->new_data_offset)
4203 mddev->delta_disks = n - olddisks;
4204 mddev->raid_disks = n;
4205 mddev->reshape_backwards = (mddev->delta_disks < 0);
4207 mddev->raid_disks = n;
4209 mddev_unlock(mddev);
4210 return err ? err : len;
4212 static struct md_sysfs_entry md_raid_disks =
4213 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4216 uuid_show(struct mddev *mddev, char *page)
4218 return sprintf(page, "%pU\n", mddev->uuid);
4220 static struct md_sysfs_entry md_uuid =
4221 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4224 chunk_size_show(struct mddev *mddev, char *page)
4226 if (mddev->reshape_position != MaxSector &&
4227 mddev->chunk_sectors != mddev->new_chunk_sectors)
4228 return sprintf(page, "%d (%d)\n",
4229 mddev->new_chunk_sectors << 9,
4230 mddev->chunk_sectors << 9);
4231 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4235 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4240 err = kstrtoul(buf, 10, &n);
4244 err = mddev_lock(mddev);
4248 if (mddev->pers->check_reshape == NULL)
4253 mddev->new_chunk_sectors = n >> 9;
4254 err = mddev->pers->check_reshape(mddev);
4256 mddev->new_chunk_sectors = mddev->chunk_sectors;
4259 mddev->new_chunk_sectors = n >> 9;
4260 if (mddev->reshape_position == MaxSector)
4261 mddev->chunk_sectors = n >> 9;
4263 mddev_unlock(mddev);
4266 static struct md_sysfs_entry md_chunk_size =
4267 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4270 resync_start_show(struct mddev *mddev, char *page)
4272 if (mddev->recovery_cp == MaxSector)
4273 return sprintf(page, "none\n");
4274 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4278 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4280 unsigned long long n;
4283 if (cmd_match(buf, "none"))
4286 err = kstrtoull(buf, 10, &n);
4289 if (n != (sector_t)n)
4293 err = mddev_lock(mddev);
4296 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4300 mddev->recovery_cp = n;
4302 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4304 mddev_unlock(mddev);
4307 static struct md_sysfs_entry md_resync_start =
4308 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4309 resync_start_show, resync_start_store);
4312 * The array state can be:
4315 * No devices, no size, no level
4316 * Equivalent to STOP_ARRAY ioctl
4318 * May have some settings, but array is not active
4319 * all IO results in error
4320 * When written, doesn't tear down array, but just stops it
4321 * suspended (not supported yet)
4322 * All IO requests will block. The array can be reconfigured.
4323 * Writing this, if accepted, will block until array is quiescent
4325 * no resync can happen. no superblocks get written.
4326 * write requests fail
4328 * like readonly, but behaves like 'clean' on a write request.
4330 * clean - no pending writes, but otherwise active.
4331 * When written to inactive array, starts without resync
4332 * If a write request arrives then
4333 * if metadata is known, mark 'dirty' and switch to 'active'.
4334 * if not known, block and switch to write-pending
4335 * If written to an active array that has pending writes, then fails.
4337 * fully active: IO and resync can be happening.
4338 * When written to inactive array, starts with resync
4341 * clean, but writes are blocked waiting for 'active' to be written.
4344 * like active, but no writes have been seen for a while (100msec).
4347 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4348 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4349 * when a member is gone, so this state will at least alert the
4350 * user that something is wrong.
4352 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4353 write_pending, active_idle, broken, bad_word};
4354 static char *array_states[] = {
4355 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4356 "write-pending", "active-idle", "broken", NULL };
4358 static int match_word(const char *word, char **list)
4361 for (n=0; list[n]; n++)
4362 if (cmd_match(word, list[n]))
4368 array_state_show(struct mddev *mddev, char *page)
4370 enum array_state st = inactive;
4372 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4381 spin_lock(&mddev->lock);
4382 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4384 else if (mddev->in_sync)
4386 else if (mddev->safemode)
4390 spin_unlock(&mddev->lock);
4393 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4396 if (list_empty(&mddev->disks) &&
4397 mddev->raid_disks == 0 &&
4398 mddev->dev_sectors == 0)
4403 return sprintf(page, "%s\n", array_states[st]);
4406 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4407 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4408 static int restart_array(struct mddev *mddev);
4411 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4414 enum array_state st = match_word(buf, array_states);
4416 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4417 /* don't take reconfig_mutex when toggling between
4420 spin_lock(&mddev->lock);
4422 restart_array(mddev);
4423 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4424 md_wakeup_thread(mddev->thread);
4425 wake_up(&mddev->sb_wait);
4426 } else /* st == clean */ {
4427 restart_array(mddev);
4428 if (!set_in_sync(mddev))
4432 sysfs_notify_dirent_safe(mddev->sysfs_state);
4433 spin_unlock(&mddev->lock);
4436 err = mddev_lock(mddev);
4444 /* stopping an active array */
4445 err = do_md_stop(mddev, 0, NULL);
4448 /* stopping an active array */
4450 err = do_md_stop(mddev, 2, NULL);
4452 err = 0; /* already inactive */
4455 break; /* not supported yet */
4458 err = md_set_readonly(mddev, NULL);
4461 set_disk_ro(mddev->gendisk, 1);
4462 err = do_md_run(mddev);
4468 err = md_set_readonly(mddev, NULL);
4469 else if (mddev->ro == 1)
4470 err = restart_array(mddev);
4473 set_disk_ro(mddev->gendisk, 0);
4477 err = do_md_run(mddev);
4482 err = restart_array(mddev);
4485 spin_lock(&mddev->lock);
4486 if (!set_in_sync(mddev))
4488 spin_unlock(&mddev->lock);
4494 err = restart_array(mddev);
4497 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4498 wake_up(&mddev->sb_wait);
4502 set_disk_ro(mddev->gendisk, 0);
4503 err = do_md_run(mddev);
4509 /* these cannot be set */
4514 if (mddev->hold_active == UNTIL_IOCTL)
4515 mddev->hold_active = 0;
4516 sysfs_notify_dirent_safe(mddev->sysfs_state);
4518 mddev_unlock(mddev);
4521 static struct md_sysfs_entry md_array_state =
4522 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4525 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4526 return sprintf(page, "%d\n",
4527 atomic_read(&mddev->max_corr_read_errors));
4531 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4536 rv = kstrtouint(buf, 10, &n);
4539 atomic_set(&mddev->max_corr_read_errors, n);
4543 static struct md_sysfs_entry max_corr_read_errors =
4544 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4545 max_corrected_read_errors_store);
4548 null_show(struct mddev *mddev, char *page)
4553 /* need to ensure rdev_delayed_delete() has completed */
4554 static void flush_rdev_wq(struct mddev *mddev)
4556 struct md_rdev *rdev;
4559 rdev_for_each_rcu(rdev, mddev)
4560 if (work_pending(&rdev->del_work)) {
4561 flush_workqueue(md_rdev_misc_wq);
4568 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4570 /* buf must be %d:%d\n? giving major and minor numbers */
4571 /* The new device is added to the array.
4572 * If the array has a persistent superblock, we read the
4573 * superblock to initialise info and check validity.
4574 * Otherwise, only checking done is that in bind_rdev_to_array,
4575 * which mainly checks size.
4578 int major = simple_strtoul(buf, &e, 10);
4581 struct md_rdev *rdev;
4584 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4586 minor = simple_strtoul(e+1, &e, 10);
4587 if (*e && *e != '\n')
4589 dev = MKDEV(major, minor);
4590 if (major != MAJOR(dev) ||
4591 minor != MINOR(dev))
4594 flush_rdev_wq(mddev);
4595 err = mddev_lock(mddev);
4598 if (mddev->persistent) {
4599 rdev = md_import_device(dev, mddev->major_version,
4600 mddev->minor_version);
4601 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4602 struct md_rdev *rdev0
4603 = list_entry(mddev->disks.next,
4604 struct md_rdev, same_set);
4605 err = super_types[mddev->major_version]
4606 .load_super(rdev, rdev0, mddev->minor_version);
4610 } else if (mddev->external)
4611 rdev = md_import_device(dev, -2, -1);
4613 rdev = md_import_device(dev, -1, -1);
4616 mddev_unlock(mddev);
4617 return PTR_ERR(rdev);
4619 err = bind_rdev_to_array(rdev, mddev);
4623 mddev_unlock(mddev);
4625 md_new_event(mddev);
4626 return err ? err : len;
4629 static struct md_sysfs_entry md_new_device =
4630 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4633 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4636 unsigned long chunk, end_chunk;
4639 err = mddev_lock(mddev);
4644 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4646 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4647 if (buf == end) break;
4648 if (*end == '-') { /* range */
4650 end_chunk = simple_strtoul(buf, &end, 0);
4651 if (buf == end) break;
4653 if (*end && !isspace(*end)) break;
4654 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4655 buf = skip_spaces(end);
4657 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4659 mddev_unlock(mddev);
4663 static struct md_sysfs_entry md_bitmap =
4664 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4667 size_show(struct mddev *mddev, char *page)
4669 return sprintf(page, "%llu\n",
4670 (unsigned long long)mddev->dev_sectors / 2);
4673 static int update_size(struct mddev *mddev, sector_t num_sectors);
4676 size_store(struct mddev *mddev, const char *buf, size_t len)
4678 /* If array is inactive, we can reduce the component size, but
4679 * not increase it (except from 0).
4680 * If array is active, we can try an on-line resize
4683 int err = strict_blocks_to_sectors(buf, §ors);
4687 err = mddev_lock(mddev);
4691 err = update_size(mddev, sectors);
4693 md_update_sb(mddev, 1);
4695 if (mddev->dev_sectors == 0 ||
4696 mddev->dev_sectors > sectors)
4697 mddev->dev_sectors = sectors;
4701 mddev_unlock(mddev);
4702 return err ? err : len;
4705 static struct md_sysfs_entry md_size =
4706 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4708 /* Metadata version.
4710 * 'none' for arrays with no metadata (good luck...)
4711 * 'external' for arrays with externally managed metadata,
4712 * or N.M for internally known formats
4715 metadata_show(struct mddev *mddev, char *page)
4717 if (mddev->persistent)
4718 return sprintf(page, "%d.%d\n",
4719 mddev->major_version, mddev->minor_version);
4720 else if (mddev->external)
4721 return sprintf(page, "external:%s\n", mddev->metadata_type);
4723 return sprintf(page, "none\n");
4727 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4732 /* Changing the details of 'external' metadata is
4733 * always permitted. Otherwise there must be
4734 * no devices attached to the array.
4737 err = mddev_lock(mddev);
4741 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4743 else if (!list_empty(&mddev->disks))
4747 if (cmd_match(buf, "none")) {
4748 mddev->persistent = 0;
4749 mddev->external = 0;
4750 mddev->major_version = 0;
4751 mddev->minor_version = 90;
4754 if (strncmp(buf, "external:", 9) == 0) {
4755 size_t namelen = len-9;
4756 if (namelen >= sizeof(mddev->metadata_type))
4757 namelen = sizeof(mddev->metadata_type)-1;
4758 strncpy(mddev->metadata_type, buf+9, namelen);
4759 mddev->metadata_type[namelen] = 0;
4760 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4761 mddev->metadata_type[--namelen] = 0;
4762 mddev->persistent = 0;
4763 mddev->external = 1;
4764 mddev->major_version = 0;
4765 mddev->minor_version = 90;
4768 major = simple_strtoul(buf, &e, 10);
4770 if (e==buf || *e != '.')
4773 minor = simple_strtoul(buf, &e, 10);
4774 if (e==buf || (*e && *e != '\n') )
4777 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4779 mddev->major_version = major;
4780 mddev->minor_version = minor;
4781 mddev->persistent = 1;
4782 mddev->external = 0;
4785 mddev_unlock(mddev);
4789 static struct md_sysfs_entry md_metadata =
4790 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4793 action_show(struct mddev *mddev, char *page)
4795 char *type = "idle";
4796 unsigned long recovery = mddev->recovery;
4797 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4799 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4800 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4801 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4803 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4804 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4806 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4810 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4812 else if (mddev->reshape_position != MaxSector)
4815 return sprintf(page, "%s\n", type);
4819 action_store(struct mddev *mddev, const char *page, size_t len)
4821 if (!mddev->pers || !mddev->pers->sync_request)
4825 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4826 if (cmd_match(page, "frozen"))
4827 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4829 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4830 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4831 mddev_lock(mddev) == 0) {
4832 if (work_pending(&mddev->del_work))
4833 flush_workqueue(md_misc_wq);
4834 if (mddev->sync_thread) {
4835 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4836 md_reap_sync_thread(mddev);
4838 mddev_unlock(mddev);
4840 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4842 else if (cmd_match(page, "resync"))
4843 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4844 else if (cmd_match(page, "recover")) {
4845 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4846 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4847 } else if (cmd_match(page, "reshape")) {
4849 if (mddev->pers->start_reshape == NULL)
4851 err = mddev_lock(mddev);
4853 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4856 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4857 err = mddev->pers->start_reshape(mddev);
4859 mddev_unlock(mddev);
4863 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4865 if (cmd_match(page, "check"))
4866 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4867 else if (!cmd_match(page, "repair"))
4869 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4870 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4871 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4873 if (mddev->ro == 2) {
4874 /* A write to sync_action is enough to justify
4875 * canceling read-auto mode
4878 md_wakeup_thread(mddev->sync_thread);
4880 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4881 md_wakeup_thread(mddev->thread);
4882 sysfs_notify_dirent_safe(mddev->sysfs_action);
4886 static struct md_sysfs_entry md_scan_mode =
4887 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4890 last_sync_action_show(struct mddev *mddev, char *page)
4892 return sprintf(page, "%s\n", mddev->last_sync_action);
4895 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4898 mismatch_cnt_show(struct mddev *mddev, char *page)
4900 return sprintf(page, "%llu\n",
4901 (unsigned long long)
4902 atomic64_read(&mddev->resync_mismatches));
4905 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4908 sync_min_show(struct mddev *mddev, char *page)
4910 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4911 mddev->sync_speed_min ? "local": "system");
4915 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4920 if (strncmp(buf, "system", 6)==0) {
4923 rv = kstrtouint(buf, 10, &min);
4929 mddev->sync_speed_min = min;
4933 static struct md_sysfs_entry md_sync_min =
4934 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4937 sync_max_show(struct mddev *mddev, char *page)
4939 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4940 mddev->sync_speed_max ? "local": "system");
4944 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4949 if (strncmp(buf, "system", 6)==0) {
4952 rv = kstrtouint(buf, 10, &max);
4958 mddev->sync_speed_max = max;
4962 static struct md_sysfs_entry md_sync_max =
4963 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4966 degraded_show(struct mddev *mddev, char *page)
4968 return sprintf(page, "%d\n", mddev->degraded);
4970 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4973 sync_force_parallel_show(struct mddev *mddev, char *page)
4975 return sprintf(page, "%d\n", mddev->parallel_resync);
4979 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4983 if (kstrtol(buf, 10, &n))
4986 if (n != 0 && n != 1)
4989 mddev->parallel_resync = n;
4991 if (mddev->sync_thread)
4992 wake_up(&resync_wait);
4997 /* force parallel resync, even with shared block devices */
4998 static struct md_sysfs_entry md_sync_force_parallel =
4999 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5000 sync_force_parallel_show, sync_force_parallel_store);
5003 sync_speed_show(struct mddev *mddev, char *page)
5005 unsigned long resync, dt, db;
5006 if (mddev->curr_resync == 0)
5007 return sprintf(page, "none\n");
5008 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5009 dt = (jiffies - mddev->resync_mark) / HZ;
5011 db = resync - mddev->resync_mark_cnt;
5012 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5015 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5018 sync_completed_show(struct mddev *mddev, char *page)
5020 unsigned long long max_sectors, resync;
5022 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5023 return sprintf(page, "none\n");
5025 if (mddev->curr_resync == 1 ||
5026 mddev->curr_resync == 2)
5027 return sprintf(page, "delayed\n");
5029 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5030 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5031 max_sectors = mddev->resync_max_sectors;
5033 max_sectors = mddev->dev_sectors;
5035 resync = mddev->curr_resync_completed;
5036 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5039 static struct md_sysfs_entry md_sync_completed =
5040 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5043 min_sync_show(struct mddev *mddev, char *page)
5045 return sprintf(page, "%llu\n",
5046 (unsigned long long)mddev->resync_min);
5049 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5051 unsigned long long min;
5054 if (kstrtoull(buf, 10, &min))
5057 spin_lock(&mddev->lock);
5059 if (min > mddev->resync_max)
5063 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5066 /* Round down to multiple of 4K for safety */
5067 mddev->resync_min = round_down(min, 8);
5071 spin_unlock(&mddev->lock);
5075 static struct md_sysfs_entry md_min_sync =
5076 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5079 max_sync_show(struct mddev *mddev, char *page)
5081 if (mddev->resync_max == MaxSector)
5082 return sprintf(page, "max\n");
5084 return sprintf(page, "%llu\n",
5085 (unsigned long long)mddev->resync_max);
5088 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5091 spin_lock(&mddev->lock);
5092 if (strncmp(buf, "max", 3) == 0)
5093 mddev->resync_max = MaxSector;
5095 unsigned long long max;
5099 if (kstrtoull(buf, 10, &max))
5101 if (max < mddev->resync_min)
5105 if (max < mddev->resync_max &&
5107 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5110 /* Must be a multiple of chunk_size */
5111 chunk = mddev->chunk_sectors;
5113 sector_t temp = max;
5116 if (sector_div(temp, chunk))
5119 mddev->resync_max = max;
5121 wake_up(&mddev->recovery_wait);
5124 spin_unlock(&mddev->lock);
5128 static struct md_sysfs_entry md_max_sync =
5129 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5132 suspend_lo_show(struct mddev *mddev, char *page)
5134 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5138 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5140 unsigned long long new;
5143 err = kstrtoull(buf, 10, &new);
5146 if (new != (sector_t)new)
5149 err = mddev_lock(mddev);
5153 if (mddev->pers == NULL ||
5154 mddev->pers->quiesce == NULL)
5156 mddev_suspend(mddev);
5157 mddev->suspend_lo = new;
5158 mddev_resume(mddev);
5162 mddev_unlock(mddev);
5165 static struct md_sysfs_entry md_suspend_lo =
5166 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5169 suspend_hi_show(struct mddev *mddev, char *page)
5171 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5175 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5177 unsigned long long new;
5180 err = kstrtoull(buf, 10, &new);
5183 if (new != (sector_t)new)
5186 err = mddev_lock(mddev);
5190 if (mddev->pers == NULL)
5193 mddev_suspend(mddev);
5194 mddev->suspend_hi = new;
5195 mddev_resume(mddev);
5199 mddev_unlock(mddev);
5202 static struct md_sysfs_entry md_suspend_hi =
5203 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5206 reshape_position_show(struct mddev *mddev, char *page)
5208 if (mddev->reshape_position != MaxSector)
5209 return sprintf(page, "%llu\n",
5210 (unsigned long long)mddev->reshape_position);
5211 strcpy(page, "none\n");
5216 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5218 struct md_rdev *rdev;
5219 unsigned long long new;
5222 err = kstrtoull(buf, 10, &new);
5225 if (new != (sector_t)new)
5227 err = mddev_lock(mddev);
5233 mddev->reshape_position = new;
5234 mddev->delta_disks = 0;
5235 mddev->reshape_backwards = 0;
5236 mddev->new_level = mddev->level;
5237 mddev->new_layout = mddev->layout;
5238 mddev->new_chunk_sectors = mddev->chunk_sectors;
5239 rdev_for_each(rdev, mddev)
5240 rdev->new_data_offset = rdev->data_offset;
5243 mddev_unlock(mddev);
5247 static struct md_sysfs_entry md_reshape_position =
5248 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5249 reshape_position_store);
5252 reshape_direction_show(struct mddev *mddev, char *page)
5254 return sprintf(page, "%s\n",
5255 mddev->reshape_backwards ? "backwards" : "forwards");
5259 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5264 if (cmd_match(buf, "forwards"))
5266 else if (cmd_match(buf, "backwards"))
5270 if (mddev->reshape_backwards == backwards)
5273 err = mddev_lock(mddev);
5276 /* check if we are allowed to change */
5277 if (mddev->delta_disks)
5279 else if (mddev->persistent &&
5280 mddev->major_version == 0)
5283 mddev->reshape_backwards = backwards;
5284 mddev_unlock(mddev);
5288 static struct md_sysfs_entry md_reshape_direction =
5289 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5290 reshape_direction_store);
5293 array_size_show(struct mddev *mddev, char *page)
5295 if (mddev->external_size)
5296 return sprintf(page, "%llu\n",
5297 (unsigned long long)mddev->array_sectors/2);
5299 return sprintf(page, "default\n");
5303 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5308 err = mddev_lock(mddev);
5312 /* cluster raid doesn't support change array_sectors */
5313 if (mddev_is_clustered(mddev)) {
5314 mddev_unlock(mddev);
5318 if (strncmp(buf, "default", 7) == 0) {
5320 sectors = mddev->pers->size(mddev, 0, 0);
5322 sectors = mddev->array_sectors;
5324 mddev->external_size = 0;
5326 if (strict_blocks_to_sectors(buf, §ors) < 0)
5328 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5331 mddev->external_size = 1;
5335 mddev->array_sectors = sectors;
5337 set_capacity_and_notify(mddev->gendisk,
5338 mddev->array_sectors);
5340 mddev_unlock(mddev);
5344 static struct md_sysfs_entry md_array_size =
5345 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5349 consistency_policy_show(struct mddev *mddev, char *page)
5353 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5354 ret = sprintf(page, "journal\n");
5355 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5356 ret = sprintf(page, "ppl\n");
5357 } else if (mddev->bitmap) {
5358 ret = sprintf(page, "bitmap\n");
5359 } else if (mddev->pers) {
5360 if (mddev->pers->sync_request)
5361 ret = sprintf(page, "resync\n");
5363 ret = sprintf(page, "none\n");
5365 ret = sprintf(page, "unknown\n");
5372 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5377 if (mddev->pers->change_consistency_policy)
5378 err = mddev->pers->change_consistency_policy(mddev, buf);
5381 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5382 set_bit(MD_HAS_PPL, &mddev->flags);
5387 return err ? err : len;
5390 static struct md_sysfs_entry md_consistency_policy =
5391 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5392 consistency_policy_store);
5394 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5396 return sprintf(page, "%d\n", mddev->fail_last_dev);
5400 * Setting fail_last_dev to true to allow last device to be forcibly removed
5401 * from RAID1/RAID10.
5404 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5409 ret = kstrtobool(buf, &value);
5413 if (value != mddev->fail_last_dev)
5414 mddev->fail_last_dev = value;
5418 static struct md_sysfs_entry md_fail_last_dev =
5419 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5420 fail_last_dev_store);
5422 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5424 if (mddev->pers == NULL || (mddev->pers->level != 1))
5425 return sprintf(page, "n/a\n");
5427 return sprintf(page, "%d\n", mddev->serialize_policy);
5431 * Setting serialize_policy to true to enforce write IO is not reordered
5435 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5440 err = kstrtobool(buf, &value);
5444 if (value == mddev->serialize_policy)
5447 err = mddev_lock(mddev);
5450 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5451 pr_err("md: serialize_policy is only effective for raid1\n");
5456 mddev_suspend(mddev);
5458 mddev_create_serial_pool(mddev, NULL, true);
5460 mddev_destroy_serial_pool(mddev, NULL, true);
5461 mddev->serialize_policy = value;
5462 mddev_resume(mddev);
5464 mddev_unlock(mddev);
5468 static struct md_sysfs_entry md_serialize_policy =
5469 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5470 serialize_policy_store);
5473 static struct attribute *md_default_attrs[] = {
5476 &md_raid_disks.attr,
5478 &md_chunk_size.attr,
5480 &md_resync_start.attr,
5482 &md_new_device.attr,
5483 &md_safe_delay.attr,
5484 &md_array_state.attr,
5485 &md_reshape_position.attr,
5486 &md_reshape_direction.attr,
5487 &md_array_size.attr,
5488 &max_corr_read_errors.attr,
5489 &md_consistency_policy.attr,
5490 &md_fail_last_dev.attr,
5491 &md_serialize_policy.attr,
5495 static struct attribute *md_redundancy_attrs[] = {
5497 &md_last_scan_mode.attr,
5498 &md_mismatches.attr,
5501 &md_sync_speed.attr,
5502 &md_sync_force_parallel.attr,
5503 &md_sync_completed.attr,
5506 &md_suspend_lo.attr,
5507 &md_suspend_hi.attr,
5512 static const struct attribute_group md_redundancy_group = {
5514 .attrs = md_redundancy_attrs,
5518 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5520 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5521 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5526 spin_lock(&all_mddevs_lock);
5527 if (list_empty(&mddev->all_mddevs)) {
5528 spin_unlock(&all_mddevs_lock);
5532 spin_unlock(&all_mddevs_lock);
5534 rv = entry->show(mddev, page);
5540 md_attr_store(struct kobject *kobj, struct attribute *attr,
5541 const char *page, size_t length)
5543 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5544 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5549 if (!capable(CAP_SYS_ADMIN))
5551 spin_lock(&all_mddevs_lock);
5552 if (list_empty(&mddev->all_mddevs)) {
5553 spin_unlock(&all_mddevs_lock);
5557 spin_unlock(&all_mddevs_lock);
5558 rv = entry->store(mddev, page, length);
5563 static void md_free(struct kobject *ko)
5565 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5567 if (mddev->sysfs_state)
5568 sysfs_put(mddev->sysfs_state);
5569 if (mddev->sysfs_level)
5570 sysfs_put(mddev->sysfs_level);
5572 if (mddev->gendisk) {
5573 del_gendisk(mddev->gendisk);
5574 blk_cleanup_disk(mddev->gendisk);
5576 percpu_ref_exit(&mddev->writes_pending);
5578 bioset_exit(&mddev->bio_set);
5579 bioset_exit(&mddev->sync_set);
5580 if (mddev->level != 1 && mddev->level != 10)
5581 bioset_exit(&mddev->io_acct_set);
5585 static const struct sysfs_ops md_sysfs_ops = {
5586 .show = md_attr_show,
5587 .store = md_attr_store,
5589 static struct kobj_type md_ktype = {
5591 .sysfs_ops = &md_sysfs_ops,
5592 .default_attrs = md_default_attrs,
5597 static void mddev_delayed_delete(struct work_struct *ws)
5599 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5601 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5602 kobject_del(&mddev->kobj);
5603 kobject_put(&mddev->kobj);
5606 static void no_op(struct percpu_ref *r) {}
5608 int mddev_init_writes_pending(struct mddev *mddev)
5610 if (mddev->writes_pending.percpu_count_ptr)
5612 if (percpu_ref_init(&mddev->writes_pending, no_op,
5613 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5615 /* We want to start with the refcount at zero */
5616 percpu_ref_put(&mddev->writes_pending);
5619 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5621 static int md_alloc(dev_t dev, char *name)
5624 * If dev is zero, name is the name of a device to allocate with
5625 * an arbitrary minor number. It will be "md_???"
5626 * If dev is non-zero it must be a device number with a MAJOR of
5627 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5628 * the device is being created by opening a node in /dev.
5629 * If "name" is not NULL, the device is being created by
5630 * writing to /sys/module/md_mod/parameters/new_array.
5632 static DEFINE_MUTEX(disks_mutex);
5633 struct mddev *mddev;
5634 struct gendisk *disk;
5641 * Wait for any previous instance of this device to be completely
5642 * removed (mddev_delayed_delete).
5644 flush_workqueue(md_misc_wq);
5646 mutex_lock(&disks_mutex);
5647 mddev = mddev_alloc(dev);
5648 if (IS_ERR(mddev)) {
5649 mutex_unlock(&disks_mutex);
5650 return PTR_ERR(mddev);
5653 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5654 shift = partitioned ? MdpMinorShift : 0;
5655 unit = MINOR(mddev->unit) >> shift;
5658 /* Need to ensure that 'name' is not a duplicate.
5660 struct mddev *mddev2;
5661 spin_lock(&all_mddevs_lock);
5663 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5664 if (mddev2->gendisk &&
5665 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5666 spin_unlock(&all_mddevs_lock);
5670 spin_unlock(&all_mddevs_lock);
5674 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5676 mddev->hold_active = UNTIL_STOP;
5679 disk = blk_alloc_disk(NUMA_NO_NODE);
5683 disk->major = MAJOR(mddev->unit);
5684 disk->first_minor = unit << shift;
5685 disk->minors = 1 << shift;
5687 strcpy(disk->disk_name, name);
5688 else if (partitioned)
5689 sprintf(disk->disk_name, "md_d%d", unit);
5691 sprintf(disk->disk_name, "md%d", unit);
5692 disk->fops = &md_fops;
5693 disk->private_data = mddev;
5695 mddev->queue = disk->queue;
5696 blk_set_stacking_limits(&mddev->queue->limits);
5697 blk_queue_write_cache(mddev->queue, true, true);
5698 /* Allow extended partitions. This makes the
5699 * 'mdp' device redundant, but we can't really
5702 disk->flags |= GENHD_FL_EXT_DEVT;
5703 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5704 mddev->gendisk = disk;
5707 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5709 /* This isn't possible, but as kobject_init_and_add is marked
5710 * __must_check, we must do something with the result
5712 pr_debug("md: cannot register %s/md - name in use\n",
5716 if (mddev->kobj.sd &&
5717 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5718 pr_debug("pointless warning\n");
5720 mutex_unlock(&disks_mutex);
5721 if (!error && mddev->kobj.sd) {
5722 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5723 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5724 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5730 static void md_probe(dev_t dev)
5732 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5735 md_alloc(dev, NULL);
5738 static int add_named_array(const char *val, const struct kernel_param *kp)
5741 * val must be "md_*" or "mdNNN".
5742 * For "md_*" we allocate an array with a large free minor number, and
5743 * set the name to val. val must not already be an active name.
5744 * For "mdNNN" we allocate an array with the minor number NNN
5745 * which must not already be in use.
5747 int len = strlen(val);
5748 char buf[DISK_NAME_LEN];
5749 unsigned long devnum;
5751 while (len && val[len-1] == '\n')
5753 if (len >= DISK_NAME_LEN)
5755 strlcpy(buf, val, len+1);
5756 if (strncmp(buf, "md_", 3) == 0)
5757 return md_alloc(0, buf);
5758 if (strncmp(buf, "md", 2) == 0 &&
5760 kstrtoul(buf+2, 10, &devnum) == 0 &&
5761 devnum <= MINORMASK)
5762 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5767 static void md_safemode_timeout(struct timer_list *t)
5769 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5771 mddev->safemode = 1;
5772 if (mddev->external)
5773 sysfs_notify_dirent_safe(mddev->sysfs_state);
5775 md_wakeup_thread(mddev->thread);
5778 static int start_dirty_degraded;
5780 int md_run(struct mddev *mddev)
5783 struct md_rdev *rdev;
5784 struct md_personality *pers;
5786 if (list_empty(&mddev->disks))
5787 /* cannot run an array with no devices.. */
5792 /* Cannot run until previous stop completes properly */
5793 if (mddev->sysfs_active)
5797 * Analyze all RAID superblock(s)
5799 if (!mddev->raid_disks) {
5800 if (!mddev->persistent)
5802 err = analyze_sbs(mddev);
5807 if (mddev->level != LEVEL_NONE)
5808 request_module("md-level-%d", mddev->level);
5809 else if (mddev->clevel[0])
5810 request_module("md-%s", mddev->clevel);
5813 * Drop all container device buffers, from now on
5814 * the only valid external interface is through the md
5817 mddev->has_superblocks = false;
5818 rdev_for_each(rdev, mddev) {
5819 if (test_bit(Faulty, &rdev->flags))
5821 sync_blockdev(rdev->bdev);
5822 invalidate_bdev(rdev->bdev);
5823 if (mddev->ro != 1 && rdev_read_only(rdev)) {
5826 set_disk_ro(mddev->gendisk, 1);
5830 mddev->has_superblocks = true;
5832 /* perform some consistency tests on the device.
5833 * We don't want the data to overlap the metadata,
5834 * Internal Bitmap issues have been handled elsewhere.
5836 if (rdev->meta_bdev) {
5837 /* Nothing to check */;
5838 } else if (rdev->data_offset < rdev->sb_start) {
5839 if (mddev->dev_sectors &&
5840 rdev->data_offset + mddev->dev_sectors
5842 pr_warn("md: %s: data overlaps metadata\n",
5847 if (rdev->sb_start + rdev->sb_size/512
5848 > rdev->data_offset) {
5849 pr_warn("md: %s: metadata overlaps data\n",
5854 sysfs_notify_dirent_safe(rdev->sysfs_state);
5857 if (!bioset_initialized(&mddev->bio_set)) {
5858 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5862 if (!bioset_initialized(&mddev->sync_set)) {
5863 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5867 if (mddev->level != 1 && mddev->level != 10 &&
5868 !bioset_initialized(&mddev->io_acct_set)) {
5869 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
5870 offsetof(struct md_io_acct, bio_clone), 0);
5875 spin_lock(&pers_lock);
5876 pers = find_pers(mddev->level, mddev->clevel);
5877 if (!pers || !try_module_get(pers->owner)) {
5878 spin_unlock(&pers_lock);
5879 if (mddev->level != LEVEL_NONE)
5880 pr_warn("md: personality for level %d is not loaded!\n",
5883 pr_warn("md: personality for level %s is not loaded!\n",
5888 spin_unlock(&pers_lock);
5889 if (mddev->level != pers->level) {
5890 mddev->level = pers->level;
5891 mddev->new_level = pers->level;
5893 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5895 if (mddev->reshape_position != MaxSector &&
5896 pers->start_reshape == NULL) {
5897 /* This personality cannot handle reshaping... */
5898 module_put(pers->owner);
5903 if (pers->sync_request) {
5904 /* Warn if this is a potentially silly
5907 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5908 struct md_rdev *rdev2;
5911 rdev_for_each(rdev, mddev)
5912 rdev_for_each(rdev2, mddev) {
5914 rdev->bdev->bd_disk ==
5915 rdev2->bdev->bd_disk) {
5916 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5918 bdevname(rdev->bdev,b),
5919 bdevname(rdev2->bdev,b2));
5925 pr_warn("True protection against single-disk failure might be compromised.\n");
5928 mddev->recovery = 0;
5929 /* may be over-ridden by personality */
5930 mddev->resync_max_sectors = mddev->dev_sectors;
5932 mddev->ok_start_degraded = start_dirty_degraded;
5934 if (start_readonly && mddev->ro == 0)
5935 mddev->ro = 2; /* read-only, but switch on first write */
5937 err = pers->run(mddev);
5939 pr_warn("md: pers->run() failed ...\n");
5940 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5941 WARN_ONCE(!mddev->external_size,
5942 "%s: default size too small, but 'external_size' not in effect?\n",
5944 pr_warn("md: invalid array_size %llu > default size %llu\n",
5945 (unsigned long long)mddev->array_sectors / 2,
5946 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5949 if (err == 0 && pers->sync_request &&
5950 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5951 struct bitmap *bitmap;
5953 bitmap = md_bitmap_create(mddev, -1);
5954 if (IS_ERR(bitmap)) {
5955 err = PTR_ERR(bitmap);
5956 pr_warn("%s: failed to create bitmap (%d)\n",
5957 mdname(mddev), err);
5959 mddev->bitmap = bitmap;
5965 if (mddev->bitmap_info.max_write_behind > 0) {
5966 bool create_pool = false;
5968 rdev_for_each(rdev, mddev) {
5969 if (test_bit(WriteMostly, &rdev->flags) &&
5970 rdev_init_serial(rdev))
5973 if (create_pool && mddev->serial_info_pool == NULL) {
5974 mddev->serial_info_pool =
5975 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5976 sizeof(struct serial_info));
5977 if (!mddev->serial_info_pool) {
5987 rdev_for_each(rdev, mddev) {
5988 if (rdev->raid_disk >= 0 &&
5989 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5994 if (mddev->degraded)
5997 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5999 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6000 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6002 if (pers->sync_request) {
6003 if (mddev->kobj.sd &&
6004 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6005 pr_warn("md: cannot register extra attributes for %s\n",
6007 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6008 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6009 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6010 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6013 atomic_set(&mddev->max_corr_read_errors,
6014 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6015 mddev->safemode = 0;
6016 if (mddev_is_clustered(mddev))
6017 mddev->safemode_delay = 0;
6019 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6022 spin_lock(&mddev->lock);
6024 spin_unlock(&mddev->lock);
6025 rdev_for_each(rdev, mddev)
6026 if (rdev->raid_disk >= 0)
6027 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6029 if (mddev->degraded && !mddev->ro)
6030 /* This ensures that recovering status is reported immediately
6031 * via sysfs - until a lack of spares is confirmed.
6033 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6034 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6036 if (mddev->sb_flags)
6037 md_update_sb(mddev, 0);
6039 md_new_event(mddev);
6043 mddev_detach(mddev);
6045 pers->free(mddev, mddev->private);
6046 mddev->private = NULL;
6047 module_put(pers->owner);
6048 md_bitmap_destroy(mddev);
6050 if (mddev->level != 1 && mddev->level != 10)
6051 bioset_exit(&mddev->io_acct_set);
6053 bioset_exit(&mddev->sync_set);
6055 bioset_exit(&mddev->bio_set);
6058 EXPORT_SYMBOL_GPL(md_run);
6060 int do_md_run(struct mddev *mddev)
6064 set_bit(MD_NOT_READY, &mddev->flags);
6065 err = md_run(mddev);
6068 err = md_bitmap_load(mddev);
6070 md_bitmap_destroy(mddev);
6074 if (mddev_is_clustered(mddev))
6075 md_allow_write(mddev);
6077 /* run start up tasks that require md_thread */
6080 md_wakeup_thread(mddev->thread);
6081 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6083 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6084 clear_bit(MD_NOT_READY, &mddev->flags);
6086 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6087 sysfs_notify_dirent_safe(mddev->sysfs_state);
6088 sysfs_notify_dirent_safe(mddev->sysfs_action);
6089 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6091 clear_bit(MD_NOT_READY, &mddev->flags);
6095 int md_start(struct mddev *mddev)
6099 if (mddev->pers->start) {
6100 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6101 md_wakeup_thread(mddev->thread);
6102 ret = mddev->pers->start(mddev);
6103 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6104 md_wakeup_thread(mddev->sync_thread);
6108 EXPORT_SYMBOL_GPL(md_start);
6110 static int restart_array(struct mddev *mddev)
6112 struct gendisk *disk = mddev->gendisk;
6113 struct md_rdev *rdev;
6114 bool has_journal = false;
6115 bool has_readonly = false;
6117 /* Complain if it has no devices */
6118 if (list_empty(&mddev->disks))
6126 rdev_for_each_rcu(rdev, mddev) {
6127 if (test_bit(Journal, &rdev->flags) &&
6128 !test_bit(Faulty, &rdev->flags))
6130 if (rdev_read_only(rdev))
6131 has_readonly = true;
6134 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6135 /* Don't restart rw with journal missing/faulty */
6140 mddev->safemode = 0;
6142 set_disk_ro(disk, 0);
6143 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6144 /* Kick recovery or resync if necessary */
6145 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6146 md_wakeup_thread(mddev->thread);
6147 md_wakeup_thread(mddev->sync_thread);
6148 sysfs_notify_dirent_safe(mddev->sysfs_state);
6152 static void md_clean(struct mddev *mddev)
6154 mddev->array_sectors = 0;
6155 mddev->external_size = 0;
6156 mddev->dev_sectors = 0;
6157 mddev->raid_disks = 0;
6158 mddev->recovery_cp = 0;
6159 mddev->resync_min = 0;
6160 mddev->resync_max = MaxSector;
6161 mddev->reshape_position = MaxSector;
6162 mddev->external = 0;
6163 mddev->persistent = 0;
6164 mddev->level = LEVEL_NONE;
6165 mddev->clevel[0] = 0;
6167 mddev->sb_flags = 0;
6169 mddev->metadata_type[0] = 0;
6170 mddev->chunk_sectors = 0;
6171 mddev->ctime = mddev->utime = 0;
6173 mddev->max_disks = 0;
6175 mddev->can_decrease_events = 0;
6176 mddev->delta_disks = 0;
6177 mddev->reshape_backwards = 0;
6178 mddev->new_level = LEVEL_NONE;
6179 mddev->new_layout = 0;
6180 mddev->new_chunk_sectors = 0;
6181 mddev->curr_resync = 0;
6182 atomic64_set(&mddev->resync_mismatches, 0);
6183 mddev->suspend_lo = mddev->suspend_hi = 0;
6184 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6185 mddev->recovery = 0;
6188 mddev->degraded = 0;
6189 mddev->safemode = 0;
6190 mddev->private = NULL;
6191 mddev->cluster_info = NULL;
6192 mddev->bitmap_info.offset = 0;
6193 mddev->bitmap_info.default_offset = 0;
6194 mddev->bitmap_info.default_space = 0;
6195 mddev->bitmap_info.chunksize = 0;
6196 mddev->bitmap_info.daemon_sleep = 0;
6197 mddev->bitmap_info.max_write_behind = 0;
6198 mddev->bitmap_info.nodes = 0;
6201 static void __md_stop_writes(struct mddev *mddev)
6203 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6204 if (work_pending(&mddev->del_work))
6205 flush_workqueue(md_misc_wq);
6206 if (mddev->sync_thread) {
6207 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6208 md_reap_sync_thread(mddev);
6211 del_timer_sync(&mddev->safemode_timer);
6213 if (mddev->pers && mddev->pers->quiesce) {
6214 mddev->pers->quiesce(mddev, 1);
6215 mddev->pers->quiesce(mddev, 0);
6217 md_bitmap_flush(mddev);
6219 if (mddev->ro == 0 &&
6220 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6222 /* mark array as shutdown cleanly */
6223 if (!mddev_is_clustered(mddev))
6225 md_update_sb(mddev, 1);
6227 /* disable policy to guarantee rdevs free resources for serialization */
6228 mddev->serialize_policy = 0;
6229 mddev_destroy_serial_pool(mddev, NULL, true);
6232 void md_stop_writes(struct mddev *mddev)
6234 mddev_lock_nointr(mddev);
6235 __md_stop_writes(mddev);
6236 mddev_unlock(mddev);
6238 EXPORT_SYMBOL_GPL(md_stop_writes);
6240 static void mddev_detach(struct mddev *mddev)
6242 md_bitmap_wait_behind_writes(mddev);
6243 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6244 mddev->pers->quiesce(mddev, 1);
6245 mddev->pers->quiesce(mddev, 0);
6247 md_unregister_thread(&mddev->thread);
6249 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6252 static void __md_stop(struct mddev *mddev)
6254 struct md_personality *pers = mddev->pers;
6255 md_bitmap_destroy(mddev);
6256 mddev_detach(mddev);
6257 /* Ensure ->event_work is done */
6258 if (mddev->event_work.func)
6259 flush_workqueue(md_misc_wq);
6260 spin_lock(&mddev->lock);
6262 spin_unlock(&mddev->lock);
6263 pers->free(mddev, mddev->private);
6264 mddev->private = NULL;
6265 if (pers->sync_request && mddev->to_remove == NULL)
6266 mddev->to_remove = &md_redundancy_group;
6267 module_put(pers->owner);
6268 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6271 void md_stop(struct mddev *mddev)
6273 /* stop the array and free an attached data structures.
6274 * This is called from dm-raid
6277 bioset_exit(&mddev->bio_set);
6278 bioset_exit(&mddev->sync_set);
6279 if (mddev->level != 1 && mddev->level != 10)
6280 bioset_exit(&mddev->io_acct_set);
6283 EXPORT_SYMBOL_GPL(md_stop);
6285 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6290 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6292 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6293 md_wakeup_thread(mddev->thread);
6295 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6296 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6297 if (mddev->sync_thread)
6298 /* Thread might be blocked waiting for metadata update
6299 * which will now never happen */
6300 wake_up_process(mddev->sync_thread->tsk);
6302 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6304 mddev_unlock(mddev);
6305 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6307 wait_event(mddev->sb_wait,
6308 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6309 mddev_lock_nointr(mddev);
6311 mutex_lock(&mddev->open_mutex);
6312 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6313 mddev->sync_thread ||
6314 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6315 pr_warn("md: %s still in use.\n",mdname(mddev));
6317 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6318 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6319 md_wakeup_thread(mddev->thread);
6325 __md_stop_writes(mddev);
6331 set_disk_ro(mddev->gendisk, 1);
6332 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6333 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6334 md_wakeup_thread(mddev->thread);
6335 sysfs_notify_dirent_safe(mddev->sysfs_state);
6339 mutex_unlock(&mddev->open_mutex);
6344 * 0 - completely stop and dis-assemble array
6345 * 2 - stop but do not disassemble array
6347 static int do_md_stop(struct mddev *mddev, int mode,
6348 struct block_device *bdev)
6350 struct gendisk *disk = mddev->gendisk;
6351 struct md_rdev *rdev;
6354 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6356 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6357 md_wakeup_thread(mddev->thread);
6359 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6360 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6361 if (mddev->sync_thread)
6362 /* Thread might be blocked waiting for metadata update
6363 * which will now never happen */
6364 wake_up_process(mddev->sync_thread->tsk);
6366 mddev_unlock(mddev);
6367 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6368 !test_bit(MD_RECOVERY_RUNNING,
6369 &mddev->recovery)));
6370 mddev_lock_nointr(mddev);
6372 mutex_lock(&mddev->open_mutex);
6373 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6374 mddev->sysfs_active ||
6375 mddev->sync_thread ||
6376 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6377 pr_warn("md: %s still in use.\n",mdname(mddev));
6378 mutex_unlock(&mddev->open_mutex);
6380 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6381 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6382 md_wakeup_thread(mddev->thread);
6388 set_disk_ro(disk, 0);
6390 __md_stop_writes(mddev);
6393 /* tell userspace to handle 'inactive' */
6394 sysfs_notify_dirent_safe(mddev->sysfs_state);
6396 rdev_for_each(rdev, mddev)
6397 if (rdev->raid_disk >= 0)
6398 sysfs_unlink_rdev(mddev, rdev);
6400 set_capacity_and_notify(disk, 0);
6401 mutex_unlock(&mddev->open_mutex);
6407 mutex_unlock(&mddev->open_mutex);
6409 * Free resources if final stop
6412 pr_info("md: %s stopped.\n", mdname(mddev));
6414 if (mddev->bitmap_info.file) {
6415 struct file *f = mddev->bitmap_info.file;
6416 spin_lock(&mddev->lock);
6417 mddev->bitmap_info.file = NULL;
6418 spin_unlock(&mddev->lock);
6421 mddev->bitmap_info.offset = 0;
6423 export_array(mddev);
6426 if (mddev->hold_active == UNTIL_STOP)
6427 mddev->hold_active = 0;
6429 md_new_event(mddev);
6430 sysfs_notify_dirent_safe(mddev->sysfs_state);
6435 static void autorun_array(struct mddev *mddev)
6437 struct md_rdev *rdev;
6440 if (list_empty(&mddev->disks))
6443 pr_info("md: running: ");
6445 rdev_for_each(rdev, mddev) {
6446 char b[BDEVNAME_SIZE];
6447 pr_cont("<%s>", bdevname(rdev->bdev,b));
6451 err = do_md_run(mddev);
6453 pr_warn("md: do_md_run() returned %d\n", err);
6454 do_md_stop(mddev, 0, NULL);
6459 * lets try to run arrays based on all disks that have arrived
6460 * until now. (those are in pending_raid_disks)
6462 * the method: pick the first pending disk, collect all disks with
6463 * the same UUID, remove all from the pending list and put them into
6464 * the 'same_array' list. Then order this list based on superblock
6465 * update time (freshest comes first), kick out 'old' disks and
6466 * compare superblocks. If everything's fine then run it.
6468 * If "unit" is allocated, then bump its reference count
6470 static void autorun_devices(int part)
6472 struct md_rdev *rdev0, *rdev, *tmp;
6473 struct mddev *mddev;
6474 char b[BDEVNAME_SIZE];
6476 pr_info("md: autorun ...\n");
6477 while (!list_empty(&pending_raid_disks)) {
6480 LIST_HEAD(candidates);
6481 rdev0 = list_entry(pending_raid_disks.next,
6482 struct md_rdev, same_set);
6484 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6485 INIT_LIST_HEAD(&candidates);
6486 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6487 if (super_90_load(rdev, rdev0, 0) >= 0) {
6488 pr_debug("md: adding %s ...\n",
6489 bdevname(rdev->bdev,b));
6490 list_move(&rdev->same_set, &candidates);
6493 * now we have a set of devices, with all of them having
6494 * mostly sane superblocks. It's time to allocate the
6498 dev = MKDEV(mdp_major,
6499 rdev0->preferred_minor << MdpMinorShift);
6500 unit = MINOR(dev) >> MdpMinorShift;
6502 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6505 if (rdev0->preferred_minor != unit) {
6506 pr_warn("md: unit number in %s is bad: %d\n",
6507 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6512 mddev = mddev_find(dev);
6516 if (mddev_lock(mddev))
6517 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6518 else if (mddev->raid_disks || mddev->major_version
6519 || !list_empty(&mddev->disks)) {
6520 pr_warn("md: %s already running, cannot run %s\n",
6521 mdname(mddev), bdevname(rdev0->bdev,b));
6522 mddev_unlock(mddev);
6524 pr_debug("md: created %s\n", mdname(mddev));
6525 mddev->persistent = 1;
6526 rdev_for_each_list(rdev, tmp, &candidates) {
6527 list_del_init(&rdev->same_set);
6528 if (bind_rdev_to_array(rdev, mddev))
6531 autorun_array(mddev);
6532 mddev_unlock(mddev);
6534 /* on success, candidates will be empty, on error
6537 rdev_for_each_list(rdev, tmp, &candidates) {
6538 list_del_init(&rdev->same_set);
6543 pr_info("md: ... autorun DONE.\n");
6545 #endif /* !MODULE */
6547 static int get_version(void __user *arg)
6551 ver.major = MD_MAJOR_VERSION;
6552 ver.minor = MD_MINOR_VERSION;
6553 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6555 if (copy_to_user(arg, &ver, sizeof(ver)))
6561 static int get_array_info(struct mddev *mddev, void __user *arg)
6563 mdu_array_info_t info;
6564 int nr,working,insync,failed,spare;
6565 struct md_rdev *rdev;
6567 nr = working = insync = failed = spare = 0;
6569 rdev_for_each_rcu(rdev, mddev) {
6571 if (test_bit(Faulty, &rdev->flags))
6575 if (test_bit(In_sync, &rdev->flags))
6577 else if (test_bit(Journal, &rdev->flags))
6578 /* TODO: add journal count to md_u.h */
6586 info.major_version = mddev->major_version;
6587 info.minor_version = mddev->minor_version;
6588 info.patch_version = MD_PATCHLEVEL_VERSION;
6589 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6590 info.level = mddev->level;
6591 info.size = mddev->dev_sectors / 2;
6592 if (info.size != mddev->dev_sectors / 2) /* overflow */
6595 info.raid_disks = mddev->raid_disks;
6596 info.md_minor = mddev->md_minor;
6597 info.not_persistent= !mddev->persistent;
6599 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6602 info.state = (1<<MD_SB_CLEAN);
6603 if (mddev->bitmap && mddev->bitmap_info.offset)
6604 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6605 if (mddev_is_clustered(mddev))
6606 info.state |= (1<<MD_SB_CLUSTERED);
6607 info.active_disks = insync;
6608 info.working_disks = working;
6609 info.failed_disks = failed;
6610 info.spare_disks = spare;
6612 info.layout = mddev->layout;
6613 info.chunk_size = mddev->chunk_sectors << 9;
6615 if (copy_to_user(arg, &info, sizeof(info)))
6621 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6623 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6627 file = kzalloc(sizeof(*file), GFP_NOIO);
6632 spin_lock(&mddev->lock);
6633 /* bitmap enabled */
6634 if (mddev->bitmap_info.file) {
6635 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6636 sizeof(file->pathname));
6640 memmove(file->pathname, ptr,
6641 sizeof(file->pathname)-(ptr-file->pathname));
6643 spin_unlock(&mddev->lock);
6646 copy_to_user(arg, file, sizeof(*file)))
6653 static int get_disk_info(struct mddev *mddev, void __user * arg)
6655 mdu_disk_info_t info;
6656 struct md_rdev *rdev;
6658 if (copy_from_user(&info, arg, sizeof(info)))
6662 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6664 info.major = MAJOR(rdev->bdev->bd_dev);
6665 info.minor = MINOR(rdev->bdev->bd_dev);
6666 info.raid_disk = rdev->raid_disk;
6668 if (test_bit(Faulty, &rdev->flags))
6669 info.state |= (1<<MD_DISK_FAULTY);
6670 else if (test_bit(In_sync, &rdev->flags)) {
6671 info.state |= (1<<MD_DISK_ACTIVE);
6672 info.state |= (1<<MD_DISK_SYNC);
6674 if (test_bit(Journal, &rdev->flags))
6675 info.state |= (1<<MD_DISK_JOURNAL);
6676 if (test_bit(WriteMostly, &rdev->flags))
6677 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6678 if (test_bit(FailFast, &rdev->flags))
6679 info.state |= (1<<MD_DISK_FAILFAST);
6681 info.major = info.minor = 0;
6682 info.raid_disk = -1;
6683 info.state = (1<<MD_DISK_REMOVED);
6687 if (copy_to_user(arg, &info, sizeof(info)))
6693 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6695 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6696 struct md_rdev *rdev;
6697 dev_t dev = MKDEV(info->major,info->minor);
6699 if (mddev_is_clustered(mddev) &&
6700 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6701 pr_warn("%s: Cannot add to clustered mddev.\n",
6706 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6709 if (!mddev->raid_disks) {
6711 /* expecting a device which has a superblock */
6712 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6714 pr_warn("md: md_import_device returned %ld\n",
6716 return PTR_ERR(rdev);
6718 if (!list_empty(&mddev->disks)) {
6719 struct md_rdev *rdev0
6720 = list_entry(mddev->disks.next,
6721 struct md_rdev, same_set);
6722 err = super_types[mddev->major_version]
6723 .load_super(rdev, rdev0, mddev->minor_version);
6725 pr_warn("md: %s has different UUID to %s\n",
6726 bdevname(rdev->bdev,b),
6727 bdevname(rdev0->bdev,b2));
6732 err = bind_rdev_to_array(rdev, mddev);
6739 * md_add_new_disk can be used once the array is assembled
6740 * to add "hot spares". They must already have a superblock
6745 if (!mddev->pers->hot_add_disk) {
6746 pr_warn("%s: personality does not support diskops!\n",
6750 if (mddev->persistent)
6751 rdev = md_import_device(dev, mddev->major_version,
6752 mddev->minor_version);
6754 rdev = md_import_device(dev, -1, -1);
6756 pr_warn("md: md_import_device returned %ld\n",
6758 return PTR_ERR(rdev);
6760 /* set saved_raid_disk if appropriate */
6761 if (!mddev->persistent) {
6762 if (info->state & (1<<MD_DISK_SYNC) &&
6763 info->raid_disk < mddev->raid_disks) {
6764 rdev->raid_disk = info->raid_disk;
6765 set_bit(In_sync, &rdev->flags);
6766 clear_bit(Bitmap_sync, &rdev->flags);
6768 rdev->raid_disk = -1;
6769 rdev->saved_raid_disk = rdev->raid_disk;
6771 super_types[mddev->major_version].
6772 validate_super(mddev, rdev);
6773 if ((info->state & (1<<MD_DISK_SYNC)) &&
6774 rdev->raid_disk != info->raid_disk) {
6775 /* This was a hot-add request, but events doesn't
6776 * match, so reject it.
6782 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6783 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6784 set_bit(WriteMostly, &rdev->flags);
6786 clear_bit(WriteMostly, &rdev->flags);
6787 if (info->state & (1<<MD_DISK_FAILFAST))
6788 set_bit(FailFast, &rdev->flags);
6790 clear_bit(FailFast, &rdev->flags);
6792 if (info->state & (1<<MD_DISK_JOURNAL)) {
6793 struct md_rdev *rdev2;
6794 bool has_journal = false;
6796 /* make sure no existing journal disk */
6797 rdev_for_each(rdev2, mddev) {
6798 if (test_bit(Journal, &rdev2->flags)) {
6803 if (has_journal || mddev->bitmap) {
6807 set_bit(Journal, &rdev->flags);
6810 * check whether the device shows up in other nodes
6812 if (mddev_is_clustered(mddev)) {
6813 if (info->state & (1 << MD_DISK_CANDIDATE))
6814 set_bit(Candidate, &rdev->flags);
6815 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6816 /* --add initiated by this node */
6817 err = md_cluster_ops->add_new_disk(mddev, rdev);
6825 rdev->raid_disk = -1;
6826 err = bind_rdev_to_array(rdev, mddev);
6831 if (mddev_is_clustered(mddev)) {
6832 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6834 err = md_cluster_ops->new_disk_ack(mddev,
6837 md_kick_rdev_from_array(rdev);
6841 md_cluster_ops->add_new_disk_cancel(mddev);
6843 err = add_bound_rdev(rdev);
6847 err = add_bound_rdev(rdev);
6852 /* otherwise, md_add_new_disk is only allowed
6853 * for major_version==0 superblocks
6855 if (mddev->major_version != 0) {
6856 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6860 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6862 rdev = md_import_device(dev, -1, 0);
6864 pr_warn("md: error, md_import_device() returned %ld\n",
6866 return PTR_ERR(rdev);
6868 rdev->desc_nr = info->number;
6869 if (info->raid_disk < mddev->raid_disks)
6870 rdev->raid_disk = info->raid_disk;
6872 rdev->raid_disk = -1;
6874 if (rdev->raid_disk < mddev->raid_disks)
6875 if (info->state & (1<<MD_DISK_SYNC))
6876 set_bit(In_sync, &rdev->flags);
6878 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6879 set_bit(WriteMostly, &rdev->flags);
6880 if (info->state & (1<<MD_DISK_FAILFAST))
6881 set_bit(FailFast, &rdev->flags);
6883 if (!mddev->persistent) {
6884 pr_debug("md: nonpersistent superblock ...\n");
6885 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6887 rdev->sb_start = calc_dev_sboffset(rdev);
6888 rdev->sectors = rdev->sb_start;
6890 err = bind_rdev_to_array(rdev, mddev);
6900 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6902 char b[BDEVNAME_SIZE];
6903 struct md_rdev *rdev;
6908 rdev = find_rdev(mddev, dev);
6912 if (rdev->raid_disk < 0)
6915 clear_bit(Blocked, &rdev->flags);
6916 remove_and_add_spares(mddev, rdev);
6918 if (rdev->raid_disk >= 0)
6922 if (mddev_is_clustered(mddev)) {
6923 if (md_cluster_ops->remove_disk(mddev, rdev))
6927 md_kick_rdev_from_array(rdev);
6928 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6930 md_wakeup_thread(mddev->thread);
6932 md_update_sb(mddev, 1);
6933 md_new_event(mddev);
6937 pr_debug("md: cannot remove active disk %s from %s ...\n",
6938 bdevname(rdev->bdev,b), mdname(mddev));
6942 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6944 char b[BDEVNAME_SIZE];
6946 struct md_rdev *rdev;
6951 if (mddev->major_version != 0) {
6952 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6956 if (!mddev->pers->hot_add_disk) {
6957 pr_warn("%s: personality does not support diskops!\n",
6962 rdev = md_import_device(dev, -1, 0);
6964 pr_warn("md: error, md_import_device() returned %ld\n",
6969 if (mddev->persistent)
6970 rdev->sb_start = calc_dev_sboffset(rdev);
6972 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6974 rdev->sectors = rdev->sb_start;
6976 if (test_bit(Faulty, &rdev->flags)) {
6977 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6978 bdevname(rdev->bdev,b), mdname(mddev));
6983 clear_bit(In_sync, &rdev->flags);
6985 rdev->saved_raid_disk = -1;
6986 err = bind_rdev_to_array(rdev, mddev);
6991 * The rest should better be atomic, we can have disk failures
6992 * noticed in interrupt contexts ...
6995 rdev->raid_disk = -1;
6997 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6999 md_update_sb(mddev, 1);
7001 * Kick recovery, maybe this spare has to be added to the
7002 * array immediately.
7004 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7005 md_wakeup_thread(mddev->thread);
7006 md_new_event(mddev);
7014 static int set_bitmap_file(struct mddev *mddev, int fd)
7019 if (!mddev->pers->quiesce || !mddev->thread)
7021 if (mddev->recovery || mddev->sync_thread)
7023 /* we should be able to change the bitmap.. */
7027 struct inode *inode;
7030 if (mddev->bitmap || mddev->bitmap_info.file)
7031 return -EEXIST; /* cannot add when bitmap is present */
7035 pr_warn("%s: error: failed to get bitmap file\n",
7040 inode = f->f_mapping->host;
7041 if (!S_ISREG(inode->i_mode)) {
7042 pr_warn("%s: error: bitmap file must be a regular file\n",
7045 } else if (!(f->f_mode & FMODE_WRITE)) {
7046 pr_warn("%s: error: bitmap file must open for write\n",
7049 } else if (atomic_read(&inode->i_writecount) != 1) {
7050 pr_warn("%s: error: bitmap file is already in use\n",
7058 mddev->bitmap_info.file = f;
7059 mddev->bitmap_info.offset = 0; /* file overrides offset */
7060 } else if (mddev->bitmap == NULL)
7061 return -ENOENT; /* cannot remove what isn't there */
7065 struct bitmap *bitmap;
7067 bitmap = md_bitmap_create(mddev, -1);
7068 mddev_suspend(mddev);
7069 if (!IS_ERR(bitmap)) {
7070 mddev->bitmap = bitmap;
7071 err = md_bitmap_load(mddev);
7073 err = PTR_ERR(bitmap);
7075 md_bitmap_destroy(mddev);
7078 mddev_resume(mddev);
7079 } else if (fd < 0) {
7080 mddev_suspend(mddev);
7081 md_bitmap_destroy(mddev);
7082 mddev_resume(mddev);
7086 struct file *f = mddev->bitmap_info.file;
7088 spin_lock(&mddev->lock);
7089 mddev->bitmap_info.file = NULL;
7090 spin_unlock(&mddev->lock);
7099 * md_set_array_info is used two different ways
7100 * The original usage is when creating a new array.
7101 * In this usage, raid_disks is > 0 and it together with
7102 * level, size, not_persistent,layout,chunksize determine the
7103 * shape of the array.
7104 * This will always create an array with a type-0.90.0 superblock.
7105 * The newer usage is when assembling an array.
7106 * In this case raid_disks will be 0, and the major_version field is
7107 * use to determine which style super-blocks are to be found on the devices.
7108 * The minor and patch _version numbers are also kept incase the
7109 * super_block handler wishes to interpret them.
7111 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7113 if (info->raid_disks == 0) {
7114 /* just setting version number for superblock loading */
7115 if (info->major_version < 0 ||
7116 info->major_version >= ARRAY_SIZE(super_types) ||
7117 super_types[info->major_version].name == NULL) {
7118 /* maybe try to auto-load a module? */
7119 pr_warn("md: superblock version %d not known\n",
7120 info->major_version);
7123 mddev->major_version = info->major_version;
7124 mddev->minor_version = info->minor_version;
7125 mddev->patch_version = info->patch_version;
7126 mddev->persistent = !info->not_persistent;
7127 /* ensure mddev_put doesn't delete this now that there
7128 * is some minimal configuration.
7130 mddev->ctime = ktime_get_real_seconds();
7133 mddev->major_version = MD_MAJOR_VERSION;
7134 mddev->minor_version = MD_MINOR_VERSION;
7135 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7136 mddev->ctime = ktime_get_real_seconds();
7138 mddev->level = info->level;
7139 mddev->clevel[0] = 0;
7140 mddev->dev_sectors = 2 * (sector_t)info->size;
7141 mddev->raid_disks = info->raid_disks;
7142 /* don't set md_minor, it is determined by which /dev/md* was
7145 if (info->state & (1<<MD_SB_CLEAN))
7146 mddev->recovery_cp = MaxSector;
7148 mddev->recovery_cp = 0;
7149 mddev->persistent = ! info->not_persistent;
7150 mddev->external = 0;
7152 mddev->layout = info->layout;
7153 if (mddev->level == 0)
7154 /* Cannot trust RAID0 layout info here */
7156 mddev->chunk_sectors = info->chunk_size >> 9;
7158 if (mddev->persistent) {
7159 mddev->max_disks = MD_SB_DISKS;
7161 mddev->sb_flags = 0;
7163 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7165 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7166 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7167 mddev->bitmap_info.offset = 0;
7169 mddev->reshape_position = MaxSector;
7172 * Generate a 128 bit UUID
7174 get_random_bytes(mddev->uuid, 16);
7176 mddev->new_level = mddev->level;
7177 mddev->new_chunk_sectors = mddev->chunk_sectors;
7178 mddev->new_layout = mddev->layout;
7179 mddev->delta_disks = 0;
7180 mddev->reshape_backwards = 0;
7185 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7187 lockdep_assert_held(&mddev->reconfig_mutex);
7189 if (mddev->external_size)
7192 mddev->array_sectors = array_sectors;
7194 EXPORT_SYMBOL(md_set_array_sectors);
7196 static int update_size(struct mddev *mddev, sector_t num_sectors)
7198 struct md_rdev *rdev;
7200 int fit = (num_sectors == 0);
7201 sector_t old_dev_sectors = mddev->dev_sectors;
7203 if (mddev->pers->resize == NULL)
7205 /* The "num_sectors" is the number of sectors of each device that
7206 * is used. This can only make sense for arrays with redundancy.
7207 * linear and raid0 always use whatever space is available. We can only
7208 * consider changing this number if no resync or reconstruction is
7209 * happening, and if the new size is acceptable. It must fit before the
7210 * sb_start or, if that is <data_offset, it must fit before the size
7211 * of each device. If num_sectors is zero, we find the largest size
7214 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7220 rdev_for_each(rdev, mddev) {
7221 sector_t avail = rdev->sectors;
7223 if (fit && (num_sectors == 0 || num_sectors > avail))
7224 num_sectors = avail;
7225 if (avail < num_sectors)
7228 rv = mddev->pers->resize(mddev, num_sectors);
7230 if (mddev_is_clustered(mddev))
7231 md_cluster_ops->update_size(mddev, old_dev_sectors);
7232 else if (mddev->queue) {
7233 set_capacity_and_notify(mddev->gendisk,
7234 mddev->array_sectors);
7240 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7243 struct md_rdev *rdev;
7244 /* change the number of raid disks */
7245 if (mddev->pers->check_reshape == NULL)
7249 if (raid_disks <= 0 ||
7250 (mddev->max_disks && raid_disks >= mddev->max_disks))
7252 if (mddev->sync_thread ||
7253 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7254 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7255 mddev->reshape_position != MaxSector)
7258 rdev_for_each(rdev, mddev) {
7259 if (mddev->raid_disks < raid_disks &&
7260 rdev->data_offset < rdev->new_data_offset)
7262 if (mddev->raid_disks > raid_disks &&
7263 rdev->data_offset > rdev->new_data_offset)
7267 mddev->delta_disks = raid_disks - mddev->raid_disks;
7268 if (mddev->delta_disks < 0)
7269 mddev->reshape_backwards = 1;
7270 else if (mddev->delta_disks > 0)
7271 mddev->reshape_backwards = 0;
7273 rv = mddev->pers->check_reshape(mddev);
7275 mddev->delta_disks = 0;
7276 mddev->reshape_backwards = 0;
7282 * update_array_info is used to change the configuration of an
7284 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7285 * fields in the info are checked against the array.
7286 * Any differences that cannot be handled will cause an error.
7287 * Normally, only one change can be managed at a time.
7289 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7295 /* calculate expected state,ignoring low bits */
7296 if (mddev->bitmap && mddev->bitmap_info.offset)
7297 state |= (1 << MD_SB_BITMAP_PRESENT);
7299 if (mddev->major_version != info->major_version ||
7300 mddev->minor_version != info->minor_version ||
7301 /* mddev->patch_version != info->patch_version || */
7302 mddev->ctime != info->ctime ||
7303 mddev->level != info->level ||
7304 /* mddev->layout != info->layout || */
7305 mddev->persistent != !info->not_persistent ||
7306 mddev->chunk_sectors != info->chunk_size >> 9 ||
7307 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7308 ((state^info->state) & 0xfffffe00)
7311 /* Check there is only one change */
7312 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7314 if (mddev->raid_disks != info->raid_disks)
7316 if (mddev->layout != info->layout)
7318 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7325 if (mddev->layout != info->layout) {
7327 * we don't need to do anything at the md level, the
7328 * personality will take care of it all.
7330 if (mddev->pers->check_reshape == NULL)
7333 mddev->new_layout = info->layout;
7334 rv = mddev->pers->check_reshape(mddev);
7336 mddev->new_layout = mddev->layout;
7340 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7341 rv = update_size(mddev, (sector_t)info->size * 2);
7343 if (mddev->raid_disks != info->raid_disks)
7344 rv = update_raid_disks(mddev, info->raid_disks);
7346 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7347 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7351 if (mddev->recovery || mddev->sync_thread) {
7355 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7356 struct bitmap *bitmap;
7357 /* add the bitmap */
7358 if (mddev->bitmap) {
7362 if (mddev->bitmap_info.default_offset == 0) {
7366 mddev->bitmap_info.offset =
7367 mddev->bitmap_info.default_offset;
7368 mddev->bitmap_info.space =
7369 mddev->bitmap_info.default_space;
7370 bitmap = md_bitmap_create(mddev, -1);
7371 mddev_suspend(mddev);
7372 if (!IS_ERR(bitmap)) {
7373 mddev->bitmap = bitmap;
7374 rv = md_bitmap_load(mddev);
7376 rv = PTR_ERR(bitmap);
7378 md_bitmap_destroy(mddev);
7379 mddev_resume(mddev);
7381 /* remove the bitmap */
7382 if (!mddev->bitmap) {
7386 if (mddev->bitmap->storage.file) {
7390 if (mddev->bitmap_info.nodes) {
7391 /* hold PW on all the bitmap lock */
7392 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7393 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7395 md_cluster_ops->unlock_all_bitmaps(mddev);
7399 mddev->bitmap_info.nodes = 0;
7400 md_cluster_ops->leave(mddev);
7401 module_put(md_cluster_mod);
7402 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7404 mddev_suspend(mddev);
7405 md_bitmap_destroy(mddev);
7406 mddev_resume(mddev);
7407 mddev->bitmap_info.offset = 0;
7410 md_update_sb(mddev, 1);
7416 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7418 struct md_rdev *rdev;
7421 if (mddev->pers == NULL)
7425 rdev = md_find_rdev_rcu(mddev, dev);
7429 md_error(mddev, rdev);
7430 if (!test_bit(Faulty, &rdev->flags))
7438 * We have a problem here : there is no easy way to give a CHS
7439 * virtual geometry. We currently pretend that we have a 2 heads
7440 * 4 sectors (with a BIG number of cylinders...). This drives
7441 * dosfs just mad... ;-)
7443 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7445 struct mddev *mddev = bdev->bd_disk->private_data;
7449 geo->cylinders = mddev->array_sectors / 8;
7453 static inline bool md_ioctl_valid(unsigned int cmd)
7457 case GET_ARRAY_INFO:
7458 case GET_BITMAP_FILE:
7461 case HOT_REMOVE_DISK:
7463 case RESTART_ARRAY_RW:
7465 case SET_ARRAY_INFO:
7466 case SET_BITMAP_FILE:
7467 case SET_DISK_FAULTY:
7470 case CLUSTERED_DISK_NACK:
7477 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7478 unsigned int cmd, unsigned long arg)
7481 void __user *argp = (void __user *)arg;
7482 struct mddev *mddev = NULL;
7483 bool did_set_md_closing = false;
7485 if (!md_ioctl_valid(cmd))
7490 case GET_ARRAY_INFO:
7494 if (!capable(CAP_SYS_ADMIN))
7499 * Commands dealing with the RAID driver but not any
7504 err = get_version(argp);
7510 * Commands creating/starting a new array:
7513 mddev = bdev->bd_disk->private_data;
7520 /* Some actions do not requires the mutex */
7522 case GET_ARRAY_INFO:
7523 if (!mddev->raid_disks && !mddev->external)
7526 err = get_array_info(mddev, argp);
7530 if (!mddev->raid_disks && !mddev->external)
7533 err = get_disk_info(mddev, argp);
7536 case SET_DISK_FAULTY:
7537 err = set_disk_faulty(mddev, new_decode_dev(arg));
7540 case GET_BITMAP_FILE:
7541 err = get_bitmap_file(mddev, argp);
7546 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7547 flush_rdev_wq(mddev);
7549 if (cmd == HOT_REMOVE_DISK)
7550 /* need to ensure recovery thread has run */
7551 wait_event_interruptible_timeout(mddev->sb_wait,
7552 !test_bit(MD_RECOVERY_NEEDED,
7554 msecs_to_jiffies(5000));
7555 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7556 /* Need to flush page cache, and ensure no-one else opens
7559 mutex_lock(&mddev->open_mutex);
7560 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7561 mutex_unlock(&mddev->open_mutex);
7565 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7566 mutex_unlock(&mddev->open_mutex);
7570 did_set_md_closing = true;
7571 mutex_unlock(&mddev->open_mutex);
7572 sync_blockdev(bdev);
7574 err = mddev_lock(mddev);
7576 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7581 if (cmd == SET_ARRAY_INFO) {
7582 mdu_array_info_t info;
7584 memset(&info, 0, sizeof(info));
7585 else if (copy_from_user(&info, argp, sizeof(info))) {
7590 err = update_array_info(mddev, &info);
7592 pr_warn("md: couldn't update array info. %d\n", err);
7597 if (!list_empty(&mddev->disks)) {
7598 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7602 if (mddev->raid_disks) {
7603 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7607 err = md_set_array_info(mddev, &info);
7609 pr_warn("md: couldn't set array info. %d\n", err);
7616 * Commands querying/configuring an existing array:
7618 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7619 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7620 if ((!mddev->raid_disks && !mddev->external)
7621 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7622 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7623 && cmd != GET_BITMAP_FILE) {
7629 * Commands even a read-only array can execute:
7632 case RESTART_ARRAY_RW:
7633 err = restart_array(mddev);
7637 err = do_md_stop(mddev, 0, bdev);
7641 err = md_set_readonly(mddev, bdev);
7644 case HOT_REMOVE_DISK:
7645 err = hot_remove_disk(mddev, new_decode_dev(arg));
7649 /* We can support ADD_NEW_DISK on read-only arrays
7650 * only if we are re-adding a preexisting device.
7651 * So require mddev->pers and MD_DISK_SYNC.
7654 mdu_disk_info_t info;
7655 if (copy_from_user(&info, argp, sizeof(info)))
7657 else if (!(info.state & (1<<MD_DISK_SYNC)))
7658 /* Need to clear read-only for this */
7661 err = md_add_new_disk(mddev, &info);
7668 * The remaining ioctls are changing the state of the
7669 * superblock, so we do not allow them on read-only arrays.
7671 if (mddev->ro && mddev->pers) {
7672 if (mddev->ro == 2) {
7674 sysfs_notify_dirent_safe(mddev->sysfs_state);
7675 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7676 /* mddev_unlock will wake thread */
7677 /* If a device failed while we were read-only, we
7678 * need to make sure the metadata is updated now.
7680 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7681 mddev_unlock(mddev);
7682 wait_event(mddev->sb_wait,
7683 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7684 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7685 mddev_lock_nointr(mddev);
7696 mdu_disk_info_t info;
7697 if (copy_from_user(&info, argp, sizeof(info)))
7700 err = md_add_new_disk(mddev, &info);
7704 case CLUSTERED_DISK_NACK:
7705 if (mddev_is_clustered(mddev))
7706 md_cluster_ops->new_disk_ack(mddev, false);
7712 err = hot_add_disk(mddev, new_decode_dev(arg));
7716 err = do_md_run(mddev);
7719 case SET_BITMAP_FILE:
7720 err = set_bitmap_file(mddev, (int)arg);
7729 if (mddev->hold_active == UNTIL_IOCTL &&
7731 mddev->hold_active = 0;
7732 mddev_unlock(mddev);
7734 if(did_set_md_closing)
7735 clear_bit(MD_CLOSING, &mddev->flags);
7738 #ifdef CONFIG_COMPAT
7739 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7740 unsigned int cmd, unsigned long arg)
7743 case HOT_REMOVE_DISK:
7745 case SET_DISK_FAULTY:
7746 case SET_BITMAP_FILE:
7747 /* These take in integer arg, do not convert */
7750 arg = (unsigned long)compat_ptr(arg);
7754 return md_ioctl(bdev, mode, cmd, arg);
7756 #endif /* CONFIG_COMPAT */
7758 static int md_set_read_only(struct block_device *bdev, bool ro)
7760 struct mddev *mddev = bdev->bd_disk->private_data;
7763 err = mddev_lock(mddev);
7767 if (!mddev->raid_disks && !mddev->external) {
7773 * Transitioning to read-auto need only happen for arrays that call
7774 * md_write_start and which are not ready for writes yet.
7776 if (!ro && mddev->ro == 1 && mddev->pers) {
7777 err = restart_array(mddev);
7784 mddev_unlock(mddev);
7788 static int md_open(struct block_device *bdev, fmode_t mode)
7791 * Succeed if we can lock the mddev, which confirms that
7792 * it isn't being stopped right now.
7794 struct mddev *mddev = mddev_find(bdev->bd_dev);
7800 if (mddev->gendisk != bdev->bd_disk) {
7801 /* we are racing with mddev_put which is discarding this
7805 /* Wait until bdev->bd_disk is definitely gone */
7806 if (work_pending(&mddev->del_work))
7807 flush_workqueue(md_misc_wq);
7810 BUG_ON(mddev != bdev->bd_disk->private_data);
7812 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7815 if (test_bit(MD_CLOSING, &mddev->flags)) {
7816 mutex_unlock(&mddev->open_mutex);
7822 atomic_inc(&mddev->openers);
7823 mutex_unlock(&mddev->open_mutex);
7825 bdev_check_media_change(bdev);
7832 static void md_release(struct gendisk *disk, fmode_t mode)
7834 struct mddev *mddev = disk->private_data;
7837 atomic_dec(&mddev->openers);
7841 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7843 struct mddev *mddev = disk->private_data;
7844 unsigned int ret = 0;
7847 ret = DISK_EVENT_MEDIA_CHANGE;
7852 const struct block_device_operations md_fops =
7854 .owner = THIS_MODULE,
7855 .submit_bio = md_submit_bio,
7857 .release = md_release,
7859 #ifdef CONFIG_COMPAT
7860 .compat_ioctl = md_compat_ioctl,
7862 .getgeo = md_getgeo,
7863 .check_events = md_check_events,
7864 .set_read_only = md_set_read_only,
7867 static int md_thread(void *arg)
7869 struct md_thread *thread = arg;
7872 * md_thread is a 'system-thread', it's priority should be very
7873 * high. We avoid resource deadlocks individually in each
7874 * raid personality. (RAID5 does preallocation) We also use RR and
7875 * the very same RT priority as kswapd, thus we will never get
7876 * into a priority inversion deadlock.
7878 * we definitely have to have equal or higher priority than
7879 * bdflush, otherwise bdflush will deadlock if there are too
7880 * many dirty RAID5 blocks.
7883 allow_signal(SIGKILL);
7884 while (!kthread_should_stop()) {
7886 /* We need to wait INTERRUPTIBLE so that
7887 * we don't add to the load-average.
7888 * That means we need to be sure no signals are
7891 if (signal_pending(current))
7892 flush_signals(current);
7894 wait_event_interruptible_timeout
7896 test_bit(THREAD_WAKEUP, &thread->flags)
7897 || kthread_should_stop() || kthread_should_park(),
7900 clear_bit(THREAD_WAKEUP, &thread->flags);
7901 if (kthread_should_park())
7903 if (!kthread_should_stop())
7904 thread->run(thread);
7910 void md_wakeup_thread(struct md_thread *thread)
7913 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7914 set_bit(THREAD_WAKEUP, &thread->flags);
7915 wake_up(&thread->wqueue);
7918 EXPORT_SYMBOL(md_wakeup_thread);
7920 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7921 struct mddev *mddev, const char *name)
7923 struct md_thread *thread;
7925 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7929 init_waitqueue_head(&thread->wqueue);
7932 thread->mddev = mddev;
7933 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7934 thread->tsk = kthread_run(md_thread, thread,
7936 mdname(thread->mddev),
7938 if (IS_ERR(thread->tsk)) {
7944 EXPORT_SYMBOL(md_register_thread);
7946 void md_unregister_thread(struct md_thread **threadp)
7948 struct md_thread *thread = *threadp;
7951 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7952 /* Locking ensures that mddev_unlock does not wake_up a
7953 * non-existent thread
7955 spin_lock(&pers_lock);
7957 spin_unlock(&pers_lock);
7959 kthread_stop(thread->tsk);
7962 EXPORT_SYMBOL(md_unregister_thread);
7964 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7966 if (!rdev || test_bit(Faulty, &rdev->flags))
7969 if (!mddev->pers || !mddev->pers->error_handler)
7971 mddev->pers->error_handler(mddev,rdev);
7972 if (mddev->degraded)
7973 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7974 sysfs_notify_dirent_safe(rdev->sysfs_state);
7975 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7976 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7977 md_wakeup_thread(mddev->thread);
7978 if (mddev->event_work.func)
7979 queue_work(md_misc_wq, &mddev->event_work);
7980 md_new_event(mddev);
7982 EXPORT_SYMBOL(md_error);
7984 /* seq_file implementation /proc/mdstat */
7986 static void status_unused(struct seq_file *seq)
7989 struct md_rdev *rdev;
7991 seq_printf(seq, "unused devices: ");
7993 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7994 char b[BDEVNAME_SIZE];
7996 seq_printf(seq, "%s ",
7997 bdevname(rdev->bdev,b));
8000 seq_printf(seq, "<none>");
8002 seq_printf(seq, "\n");
8005 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8007 sector_t max_sectors, resync, res;
8008 unsigned long dt, db = 0;
8009 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8010 int scale, recovery_active;
8011 unsigned int per_milli;
8013 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8014 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8015 max_sectors = mddev->resync_max_sectors;
8017 max_sectors = mddev->dev_sectors;
8019 resync = mddev->curr_resync;
8021 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8022 /* Still cleaning up */
8023 resync = max_sectors;
8024 } else if (resync > max_sectors)
8025 resync = max_sectors;
8027 resync -= atomic_read(&mddev->recovery_active);
8030 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8031 struct md_rdev *rdev;
8033 rdev_for_each(rdev, mddev)
8034 if (rdev->raid_disk >= 0 &&
8035 !test_bit(Faulty, &rdev->flags) &&
8036 rdev->recovery_offset != MaxSector &&
8037 rdev->recovery_offset) {
8038 seq_printf(seq, "\trecover=REMOTE");
8041 if (mddev->reshape_position != MaxSector)
8042 seq_printf(seq, "\treshape=REMOTE");
8044 seq_printf(seq, "\tresync=REMOTE");
8047 if (mddev->recovery_cp < MaxSector) {
8048 seq_printf(seq, "\tresync=PENDING");
8054 seq_printf(seq, "\tresync=DELAYED");
8058 WARN_ON(max_sectors == 0);
8059 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8060 * in a sector_t, and (max_sectors>>scale) will fit in a
8061 * u32, as those are the requirements for sector_div.
8062 * Thus 'scale' must be at least 10
8065 if (sizeof(sector_t) > sizeof(unsigned long)) {
8066 while ( max_sectors/2 > (1ULL<<(scale+32)))
8069 res = (resync>>scale)*1000;
8070 sector_div(res, (u32)((max_sectors>>scale)+1));
8074 int i, x = per_milli/50, y = 20-x;
8075 seq_printf(seq, "[");
8076 for (i = 0; i < x; i++)
8077 seq_printf(seq, "=");
8078 seq_printf(seq, ">");
8079 for (i = 0; i < y; i++)
8080 seq_printf(seq, ".");
8081 seq_printf(seq, "] ");
8083 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8084 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8086 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8088 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8089 "resync" : "recovery"))),
8090 per_milli/10, per_milli % 10,
8091 (unsigned long long) resync/2,
8092 (unsigned long long) max_sectors/2);
8095 * dt: time from mark until now
8096 * db: blocks written from mark until now
8097 * rt: remaining time
8099 * rt is a sector_t, which is always 64bit now. We are keeping
8100 * the original algorithm, but it is not really necessary.
8102 * Original algorithm:
8103 * So we divide before multiply in case it is 32bit and close
8105 * We scale the divisor (db) by 32 to avoid losing precision
8106 * near the end of resync when the number of remaining sectors
8108 * We then divide rt by 32 after multiplying by db to compensate.
8109 * The '+1' avoids division by zero if db is very small.
8111 dt = ((jiffies - mddev->resync_mark) / HZ);
8114 curr_mark_cnt = mddev->curr_mark_cnt;
8115 recovery_active = atomic_read(&mddev->recovery_active);
8116 resync_mark_cnt = mddev->resync_mark_cnt;
8118 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8119 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8121 rt = max_sectors - resync; /* number of remaining sectors */
8122 rt = div64_u64(rt, db/32+1);
8126 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8127 ((unsigned long)rt % 60)/6);
8129 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8133 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8135 struct list_head *tmp;
8137 struct mddev *mddev;
8149 spin_lock(&all_mddevs_lock);
8150 list_for_each(tmp,&all_mddevs)
8152 mddev = list_entry(tmp, struct mddev, all_mddevs);
8154 spin_unlock(&all_mddevs_lock);
8157 spin_unlock(&all_mddevs_lock);
8159 return (void*)2;/* tail */
8163 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8165 struct list_head *tmp;
8166 struct mddev *next_mddev, *mddev = v;
8172 spin_lock(&all_mddevs_lock);
8174 tmp = all_mddevs.next;
8176 tmp = mddev->all_mddevs.next;
8177 if (tmp != &all_mddevs)
8178 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8180 next_mddev = (void*)2;
8183 spin_unlock(&all_mddevs_lock);
8191 static void md_seq_stop(struct seq_file *seq, void *v)
8193 struct mddev *mddev = v;
8195 if (mddev && v != (void*)1 && v != (void*)2)
8199 static int md_seq_show(struct seq_file *seq, void *v)
8201 struct mddev *mddev = v;
8203 struct md_rdev *rdev;
8205 if (v == (void*)1) {
8206 struct md_personality *pers;
8207 seq_printf(seq, "Personalities : ");
8208 spin_lock(&pers_lock);
8209 list_for_each_entry(pers, &pers_list, list)
8210 seq_printf(seq, "[%s] ", pers->name);
8212 spin_unlock(&pers_lock);
8213 seq_printf(seq, "\n");
8214 seq->poll_event = atomic_read(&md_event_count);
8217 if (v == (void*)2) {
8222 spin_lock(&mddev->lock);
8223 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8224 seq_printf(seq, "%s : %sactive", mdname(mddev),
8225 mddev->pers ? "" : "in");
8228 seq_printf(seq, " (read-only)");
8230 seq_printf(seq, " (auto-read-only)");
8231 seq_printf(seq, " %s", mddev->pers->name);
8236 rdev_for_each_rcu(rdev, mddev) {
8237 char b[BDEVNAME_SIZE];
8238 seq_printf(seq, " %s[%d]",
8239 bdevname(rdev->bdev,b), rdev->desc_nr);
8240 if (test_bit(WriteMostly, &rdev->flags))
8241 seq_printf(seq, "(W)");
8242 if (test_bit(Journal, &rdev->flags))
8243 seq_printf(seq, "(J)");
8244 if (test_bit(Faulty, &rdev->flags)) {
8245 seq_printf(seq, "(F)");
8248 if (rdev->raid_disk < 0)
8249 seq_printf(seq, "(S)"); /* spare */
8250 if (test_bit(Replacement, &rdev->flags))
8251 seq_printf(seq, "(R)");
8252 sectors += rdev->sectors;
8256 if (!list_empty(&mddev->disks)) {
8258 seq_printf(seq, "\n %llu blocks",
8259 (unsigned long long)
8260 mddev->array_sectors / 2);
8262 seq_printf(seq, "\n %llu blocks",
8263 (unsigned long long)sectors / 2);
8265 if (mddev->persistent) {
8266 if (mddev->major_version != 0 ||
8267 mddev->minor_version != 90) {
8268 seq_printf(seq," super %d.%d",
8269 mddev->major_version,
8270 mddev->minor_version);
8272 } else if (mddev->external)
8273 seq_printf(seq, " super external:%s",
8274 mddev->metadata_type);
8276 seq_printf(seq, " super non-persistent");
8279 mddev->pers->status(seq, mddev);
8280 seq_printf(seq, "\n ");
8281 if (mddev->pers->sync_request) {
8282 if (status_resync(seq, mddev))
8283 seq_printf(seq, "\n ");
8286 seq_printf(seq, "\n ");
8288 md_bitmap_status(seq, mddev->bitmap);
8290 seq_printf(seq, "\n");
8292 spin_unlock(&mddev->lock);
8297 static const struct seq_operations md_seq_ops = {
8298 .start = md_seq_start,
8299 .next = md_seq_next,
8300 .stop = md_seq_stop,
8301 .show = md_seq_show,
8304 static int md_seq_open(struct inode *inode, struct file *file)
8306 struct seq_file *seq;
8309 error = seq_open(file, &md_seq_ops);
8313 seq = file->private_data;
8314 seq->poll_event = atomic_read(&md_event_count);
8318 static int md_unloading;
8319 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8321 struct seq_file *seq = filp->private_data;
8325 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8326 poll_wait(filp, &md_event_waiters, wait);
8328 /* always allow read */
8329 mask = EPOLLIN | EPOLLRDNORM;
8331 if (seq->poll_event != atomic_read(&md_event_count))
8332 mask |= EPOLLERR | EPOLLPRI;
8336 static const struct proc_ops mdstat_proc_ops = {
8337 .proc_open = md_seq_open,
8338 .proc_read = seq_read,
8339 .proc_lseek = seq_lseek,
8340 .proc_release = seq_release,
8341 .proc_poll = mdstat_poll,
8344 int register_md_personality(struct md_personality *p)
8346 pr_debug("md: %s personality registered for level %d\n",
8348 spin_lock(&pers_lock);
8349 list_add_tail(&p->list, &pers_list);
8350 spin_unlock(&pers_lock);
8353 EXPORT_SYMBOL(register_md_personality);
8355 int unregister_md_personality(struct md_personality *p)
8357 pr_debug("md: %s personality unregistered\n", p->name);
8358 spin_lock(&pers_lock);
8359 list_del_init(&p->list);
8360 spin_unlock(&pers_lock);
8363 EXPORT_SYMBOL(unregister_md_personality);
8365 int register_md_cluster_operations(struct md_cluster_operations *ops,
8366 struct module *module)
8369 spin_lock(&pers_lock);
8370 if (md_cluster_ops != NULL)
8373 md_cluster_ops = ops;
8374 md_cluster_mod = module;
8376 spin_unlock(&pers_lock);
8379 EXPORT_SYMBOL(register_md_cluster_operations);
8381 int unregister_md_cluster_operations(void)
8383 spin_lock(&pers_lock);
8384 md_cluster_ops = NULL;
8385 spin_unlock(&pers_lock);
8388 EXPORT_SYMBOL(unregister_md_cluster_operations);
8390 int md_setup_cluster(struct mddev *mddev, int nodes)
8393 if (!md_cluster_ops)
8394 request_module("md-cluster");
8395 spin_lock(&pers_lock);
8396 /* ensure module won't be unloaded */
8397 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8398 pr_warn("can't find md-cluster module or get it's reference.\n");
8399 spin_unlock(&pers_lock);
8402 spin_unlock(&pers_lock);
8404 ret = md_cluster_ops->join(mddev, nodes);
8406 mddev->safemode_delay = 0;
8410 void md_cluster_stop(struct mddev *mddev)
8412 if (!md_cluster_ops)
8414 md_cluster_ops->leave(mddev);
8415 module_put(md_cluster_mod);
8418 static int is_mddev_idle(struct mddev *mddev, int init)
8420 struct md_rdev *rdev;
8426 rdev_for_each_rcu(rdev, mddev) {
8427 struct gendisk *disk = rdev->bdev->bd_disk;
8428 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8429 atomic_read(&disk->sync_io);
8430 /* sync IO will cause sync_io to increase before the disk_stats
8431 * as sync_io is counted when a request starts, and
8432 * disk_stats is counted when it completes.
8433 * So resync activity will cause curr_events to be smaller than
8434 * when there was no such activity.
8435 * non-sync IO will cause disk_stat to increase without
8436 * increasing sync_io so curr_events will (eventually)
8437 * be larger than it was before. Once it becomes
8438 * substantially larger, the test below will cause
8439 * the array to appear non-idle, and resync will slow
8441 * If there is a lot of outstanding resync activity when
8442 * we set last_event to curr_events, then all that activity
8443 * completing might cause the array to appear non-idle
8444 * and resync will be slowed down even though there might
8445 * not have been non-resync activity. This will only
8446 * happen once though. 'last_events' will soon reflect
8447 * the state where there is little or no outstanding
8448 * resync requests, and further resync activity will
8449 * always make curr_events less than last_events.
8452 if (init || curr_events - rdev->last_events > 64) {
8453 rdev->last_events = curr_events;
8461 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8463 /* another "blocks" (512byte) blocks have been synced */
8464 atomic_sub(blocks, &mddev->recovery_active);
8465 wake_up(&mddev->recovery_wait);
8467 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8468 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8469 md_wakeup_thread(mddev->thread);
8470 // stop recovery, signal do_sync ....
8473 EXPORT_SYMBOL(md_done_sync);
8475 /* md_write_start(mddev, bi)
8476 * If we need to update some array metadata (e.g. 'active' flag
8477 * in superblock) before writing, schedule a superblock update
8478 * and wait for it to complete.
8479 * A return value of 'false' means that the write wasn't recorded
8480 * and cannot proceed as the array is being suspend.
8482 bool md_write_start(struct mddev *mddev, struct bio *bi)
8486 if (bio_data_dir(bi) != WRITE)
8489 BUG_ON(mddev->ro == 1);
8490 if (mddev->ro == 2) {
8491 /* need to switch to read/write */
8493 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8494 md_wakeup_thread(mddev->thread);
8495 md_wakeup_thread(mddev->sync_thread);
8499 percpu_ref_get(&mddev->writes_pending);
8500 smp_mb(); /* Match smp_mb in set_in_sync() */
8501 if (mddev->safemode == 1)
8502 mddev->safemode = 0;
8503 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8504 if (mddev->in_sync || mddev->sync_checkers) {
8505 spin_lock(&mddev->lock);
8506 if (mddev->in_sync) {
8508 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8509 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8510 md_wakeup_thread(mddev->thread);
8513 spin_unlock(&mddev->lock);
8517 sysfs_notify_dirent_safe(mddev->sysfs_state);
8518 if (!mddev->has_superblocks)
8520 wait_event(mddev->sb_wait,
8521 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8523 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8524 percpu_ref_put(&mddev->writes_pending);
8529 EXPORT_SYMBOL(md_write_start);
8531 /* md_write_inc can only be called when md_write_start() has
8532 * already been called at least once of the current request.
8533 * It increments the counter and is useful when a single request
8534 * is split into several parts. Each part causes an increment and
8535 * so needs a matching md_write_end().
8536 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8537 * a spinlocked region.
8539 void md_write_inc(struct mddev *mddev, struct bio *bi)
8541 if (bio_data_dir(bi) != WRITE)
8543 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8544 percpu_ref_get(&mddev->writes_pending);
8546 EXPORT_SYMBOL(md_write_inc);
8548 void md_write_end(struct mddev *mddev)
8550 percpu_ref_put(&mddev->writes_pending);
8552 if (mddev->safemode == 2)
8553 md_wakeup_thread(mddev->thread);
8554 else if (mddev->safemode_delay)
8555 /* The roundup() ensures this only performs locking once
8556 * every ->safemode_delay jiffies
8558 mod_timer(&mddev->safemode_timer,
8559 roundup(jiffies, mddev->safemode_delay) +
8560 mddev->safemode_delay);
8563 EXPORT_SYMBOL(md_write_end);
8565 /* This is used by raid0 and raid10 */
8566 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8567 struct bio *bio, sector_t start, sector_t size)
8569 struct bio *discard_bio = NULL;
8571 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO, 0,
8572 &discard_bio) || !discard_bio)
8575 bio_chain(discard_bio, bio);
8576 bio_clone_blkg_association(discard_bio, bio);
8578 trace_block_bio_remap(discard_bio,
8579 disk_devt(mddev->gendisk),
8580 bio->bi_iter.bi_sector);
8581 submit_bio_noacct(discard_bio);
8583 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8585 static void md_end_io_acct(struct bio *bio)
8587 struct md_io_acct *md_io_acct = bio->bi_private;
8588 struct bio *orig_bio = md_io_acct->orig_bio;
8590 orig_bio->bi_status = bio->bi_status;
8592 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8594 bio_endio(orig_bio);
8598 * Used by personalities that don't already clone the bio and thus can't
8599 * easily add the timestamp to their extended bio structure.
8601 void md_account_bio(struct mddev *mddev, struct bio **bio)
8603 struct md_io_acct *md_io_acct;
8606 if (!blk_queue_io_stat((*bio)->bi_bdev->bd_disk->queue))
8609 clone = bio_clone_fast(*bio, GFP_NOIO, &mddev->io_acct_set);
8610 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8611 md_io_acct->orig_bio = *bio;
8612 md_io_acct->start_time = bio_start_io_acct(*bio);
8614 clone->bi_end_io = md_end_io_acct;
8615 clone->bi_private = md_io_acct;
8618 EXPORT_SYMBOL_GPL(md_account_bio);
8620 /* md_allow_write(mddev)
8621 * Calling this ensures that the array is marked 'active' so that writes
8622 * may proceed without blocking. It is important to call this before
8623 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8624 * Must be called with mddev_lock held.
8626 void md_allow_write(struct mddev *mddev)
8632 if (!mddev->pers->sync_request)
8635 spin_lock(&mddev->lock);
8636 if (mddev->in_sync) {
8638 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8639 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8640 if (mddev->safemode_delay &&
8641 mddev->safemode == 0)
8642 mddev->safemode = 1;
8643 spin_unlock(&mddev->lock);
8644 md_update_sb(mddev, 0);
8645 sysfs_notify_dirent_safe(mddev->sysfs_state);
8646 /* wait for the dirty state to be recorded in the metadata */
8647 wait_event(mddev->sb_wait,
8648 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8650 spin_unlock(&mddev->lock);
8652 EXPORT_SYMBOL_GPL(md_allow_write);
8654 #define SYNC_MARKS 10
8655 #define SYNC_MARK_STEP (3*HZ)
8656 #define UPDATE_FREQUENCY (5*60*HZ)
8657 void md_do_sync(struct md_thread *thread)
8659 struct mddev *mddev = thread->mddev;
8660 struct mddev *mddev2;
8661 unsigned int currspeed = 0, window;
8662 sector_t max_sectors,j, io_sectors, recovery_done;
8663 unsigned long mark[SYNC_MARKS];
8664 unsigned long update_time;
8665 sector_t mark_cnt[SYNC_MARKS];
8667 struct list_head *tmp;
8668 sector_t last_check;
8670 struct md_rdev *rdev;
8671 char *desc, *action = NULL;
8672 struct blk_plug plug;
8675 /* just incase thread restarts... */
8676 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8677 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8679 if (mddev->ro) {/* never try to sync a read-only array */
8680 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8684 if (mddev_is_clustered(mddev)) {
8685 ret = md_cluster_ops->resync_start(mddev);
8689 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8690 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8691 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8692 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8693 && ((unsigned long long)mddev->curr_resync_completed
8694 < (unsigned long long)mddev->resync_max_sectors))
8698 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8699 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8700 desc = "data-check";
8702 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8703 desc = "requested-resync";
8707 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8712 mddev->last_sync_action = action ?: desc;
8714 /* we overload curr_resync somewhat here.
8715 * 0 == not engaged in resync at all
8716 * 2 == checking that there is no conflict with another sync
8717 * 1 == like 2, but have yielded to allow conflicting resync to
8719 * other == active in resync - this many blocks
8721 * Before starting a resync we must have set curr_resync to
8722 * 2, and then checked that every "conflicting" array has curr_resync
8723 * less than ours. When we find one that is the same or higher
8724 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8725 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8726 * This will mean we have to start checking from the beginning again.
8731 int mddev2_minor = -1;
8732 mddev->curr_resync = 2;
8735 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8737 for_each_mddev(mddev2, tmp) {
8738 if (mddev2 == mddev)
8740 if (!mddev->parallel_resync
8741 && mddev2->curr_resync
8742 && match_mddev_units(mddev, mddev2)) {
8744 if (mddev < mddev2 && mddev->curr_resync == 2) {
8745 /* arbitrarily yield */
8746 mddev->curr_resync = 1;
8747 wake_up(&resync_wait);
8749 if (mddev > mddev2 && mddev->curr_resync == 1)
8750 /* no need to wait here, we can wait the next
8751 * time 'round when curr_resync == 2
8754 /* We need to wait 'interruptible' so as not to
8755 * contribute to the load average, and not to
8756 * be caught by 'softlockup'
8758 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8759 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8760 mddev2->curr_resync >= mddev->curr_resync) {
8761 if (mddev2_minor != mddev2->md_minor) {
8762 mddev2_minor = mddev2->md_minor;
8763 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8764 desc, mdname(mddev),
8768 if (signal_pending(current))
8769 flush_signals(current);
8771 finish_wait(&resync_wait, &wq);
8774 finish_wait(&resync_wait, &wq);
8777 } while (mddev->curr_resync < 2);
8780 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8781 /* resync follows the size requested by the personality,
8782 * which defaults to physical size, but can be virtual size
8784 max_sectors = mddev->resync_max_sectors;
8785 atomic64_set(&mddev->resync_mismatches, 0);
8786 /* we don't use the checkpoint if there's a bitmap */
8787 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8788 j = mddev->resync_min;
8789 else if (!mddev->bitmap)
8790 j = mddev->recovery_cp;
8792 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8793 max_sectors = mddev->resync_max_sectors;
8795 * If the original node aborts reshaping then we continue the
8796 * reshaping, so set j again to avoid restart reshape from the
8799 if (mddev_is_clustered(mddev) &&
8800 mddev->reshape_position != MaxSector)
8801 j = mddev->reshape_position;
8803 /* recovery follows the physical size of devices */
8804 max_sectors = mddev->dev_sectors;
8807 rdev_for_each_rcu(rdev, mddev)
8808 if (rdev->raid_disk >= 0 &&
8809 !test_bit(Journal, &rdev->flags) &&
8810 !test_bit(Faulty, &rdev->flags) &&
8811 !test_bit(In_sync, &rdev->flags) &&
8812 rdev->recovery_offset < j)
8813 j = rdev->recovery_offset;
8816 /* If there is a bitmap, we need to make sure all
8817 * writes that started before we added a spare
8818 * complete before we start doing a recovery.
8819 * Otherwise the write might complete and (via
8820 * bitmap_endwrite) set a bit in the bitmap after the
8821 * recovery has checked that bit and skipped that
8824 if (mddev->bitmap) {
8825 mddev->pers->quiesce(mddev, 1);
8826 mddev->pers->quiesce(mddev, 0);
8830 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8831 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8832 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8833 speed_max(mddev), desc);
8835 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8838 for (m = 0; m < SYNC_MARKS; m++) {
8840 mark_cnt[m] = io_sectors;
8843 mddev->resync_mark = mark[last_mark];
8844 mddev->resync_mark_cnt = mark_cnt[last_mark];
8847 * Tune reconstruction:
8849 window = 32 * (PAGE_SIZE / 512);
8850 pr_debug("md: using %dk window, over a total of %lluk.\n",
8851 window/2, (unsigned long long)max_sectors/2);
8853 atomic_set(&mddev->recovery_active, 0);
8857 pr_debug("md: resuming %s of %s from checkpoint.\n",
8858 desc, mdname(mddev));
8859 mddev->curr_resync = j;
8861 mddev->curr_resync = 3; /* no longer delayed */
8862 mddev->curr_resync_completed = j;
8863 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8864 md_new_event(mddev);
8865 update_time = jiffies;
8867 blk_start_plug(&plug);
8868 while (j < max_sectors) {
8873 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8874 ((mddev->curr_resync > mddev->curr_resync_completed &&
8875 (mddev->curr_resync - mddev->curr_resync_completed)
8876 > (max_sectors >> 4)) ||
8877 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8878 (j - mddev->curr_resync_completed)*2
8879 >= mddev->resync_max - mddev->curr_resync_completed ||
8880 mddev->curr_resync_completed > mddev->resync_max
8882 /* time to update curr_resync_completed */
8883 wait_event(mddev->recovery_wait,
8884 atomic_read(&mddev->recovery_active) == 0);
8885 mddev->curr_resync_completed = j;
8886 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8887 j > mddev->recovery_cp)
8888 mddev->recovery_cp = j;
8889 update_time = jiffies;
8890 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8891 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8894 while (j >= mddev->resync_max &&
8895 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8896 /* As this condition is controlled by user-space,
8897 * we can block indefinitely, so use '_interruptible'
8898 * to avoid triggering warnings.
8900 flush_signals(current); /* just in case */
8901 wait_event_interruptible(mddev->recovery_wait,
8902 mddev->resync_max > j
8903 || test_bit(MD_RECOVERY_INTR,
8907 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8910 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8912 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8916 if (!skipped) { /* actual IO requested */
8917 io_sectors += sectors;
8918 atomic_add(sectors, &mddev->recovery_active);
8921 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8925 if (j > max_sectors)
8926 /* when skipping, extra large numbers can be returned. */
8929 mddev->curr_resync = j;
8930 mddev->curr_mark_cnt = io_sectors;
8931 if (last_check == 0)
8932 /* this is the earliest that rebuild will be
8933 * visible in /proc/mdstat
8935 md_new_event(mddev);
8937 if (last_check + window > io_sectors || j == max_sectors)
8940 last_check = io_sectors;
8942 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8944 int next = (last_mark+1) % SYNC_MARKS;
8946 mddev->resync_mark = mark[next];
8947 mddev->resync_mark_cnt = mark_cnt[next];
8948 mark[next] = jiffies;
8949 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8953 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8957 * this loop exits only if either when we are slower than
8958 * the 'hard' speed limit, or the system was IO-idle for
8960 * the system might be non-idle CPU-wise, but we only care
8961 * about not overloading the IO subsystem. (things like an
8962 * e2fsck being done on the RAID array should execute fast)
8966 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8967 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8968 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8970 if (currspeed > speed_min(mddev)) {
8971 if (currspeed > speed_max(mddev)) {
8975 if (!is_mddev_idle(mddev, 0)) {
8977 * Give other IO more of a chance.
8978 * The faster the devices, the less we wait.
8980 wait_event(mddev->recovery_wait,
8981 !atomic_read(&mddev->recovery_active));
8985 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8986 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8987 ? "interrupted" : "done");
8989 * this also signals 'finished resyncing' to md_stop
8991 blk_finish_plug(&plug);
8992 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8994 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8995 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8996 mddev->curr_resync > 3) {
8997 mddev->curr_resync_completed = mddev->curr_resync;
8998 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9000 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9002 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9003 mddev->curr_resync > 3) {
9004 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9005 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9006 if (mddev->curr_resync >= mddev->recovery_cp) {
9007 pr_debug("md: checkpointing %s of %s.\n",
9008 desc, mdname(mddev));
9009 if (test_bit(MD_RECOVERY_ERROR,
9011 mddev->recovery_cp =
9012 mddev->curr_resync_completed;
9014 mddev->recovery_cp =
9018 mddev->recovery_cp = MaxSector;
9020 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9021 mddev->curr_resync = MaxSector;
9022 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9023 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9025 rdev_for_each_rcu(rdev, mddev)
9026 if (rdev->raid_disk >= 0 &&
9027 mddev->delta_disks >= 0 &&
9028 !test_bit(Journal, &rdev->flags) &&
9029 !test_bit(Faulty, &rdev->flags) &&
9030 !test_bit(In_sync, &rdev->flags) &&
9031 rdev->recovery_offset < mddev->curr_resync)
9032 rdev->recovery_offset = mddev->curr_resync;
9038 /* set CHANGE_PENDING here since maybe another update is needed,
9039 * so other nodes are informed. It should be harmless for normal
9041 set_mask_bits(&mddev->sb_flags, 0,
9042 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9044 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9045 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9046 mddev->delta_disks > 0 &&
9047 mddev->pers->finish_reshape &&
9048 mddev->pers->size &&
9050 mddev_lock_nointr(mddev);
9051 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9052 mddev_unlock(mddev);
9053 if (!mddev_is_clustered(mddev))
9054 set_capacity_and_notify(mddev->gendisk,
9055 mddev->array_sectors);
9058 spin_lock(&mddev->lock);
9059 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9060 /* We completed so min/max setting can be forgotten if used. */
9061 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9062 mddev->resync_min = 0;
9063 mddev->resync_max = MaxSector;
9064 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9065 mddev->resync_min = mddev->curr_resync_completed;
9066 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9067 mddev->curr_resync = 0;
9068 spin_unlock(&mddev->lock);
9070 wake_up(&resync_wait);
9071 md_wakeup_thread(mddev->thread);
9074 EXPORT_SYMBOL_GPL(md_do_sync);
9076 static int remove_and_add_spares(struct mddev *mddev,
9077 struct md_rdev *this)
9079 struct md_rdev *rdev;
9082 bool remove_some = false;
9084 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9085 /* Mustn't remove devices when resync thread is running */
9088 rdev_for_each(rdev, mddev) {
9089 if ((this == NULL || rdev == this) &&
9090 rdev->raid_disk >= 0 &&
9091 !test_bit(Blocked, &rdev->flags) &&
9092 test_bit(Faulty, &rdev->flags) &&
9093 atomic_read(&rdev->nr_pending)==0) {
9094 /* Faulty non-Blocked devices with nr_pending == 0
9095 * never get nr_pending incremented,
9096 * never get Faulty cleared, and never get Blocked set.
9097 * So we can synchronize_rcu now rather than once per device
9100 set_bit(RemoveSynchronized, &rdev->flags);
9106 rdev_for_each(rdev, mddev) {
9107 if ((this == NULL || rdev == this) &&
9108 rdev->raid_disk >= 0 &&
9109 !test_bit(Blocked, &rdev->flags) &&
9110 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9111 (!test_bit(In_sync, &rdev->flags) &&
9112 !test_bit(Journal, &rdev->flags))) &&
9113 atomic_read(&rdev->nr_pending)==0)) {
9114 if (mddev->pers->hot_remove_disk(
9115 mddev, rdev) == 0) {
9116 sysfs_unlink_rdev(mddev, rdev);
9117 rdev->saved_raid_disk = rdev->raid_disk;
9118 rdev->raid_disk = -1;
9122 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9123 clear_bit(RemoveSynchronized, &rdev->flags);
9126 if (removed && mddev->kobj.sd)
9127 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9129 if (this && removed)
9132 rdev_for_each(rdev, mddev) {
9133 if (this && this != rdev)
9135 if (test_bit(Candidate, &rdev->flags))
9137 if (rdev->raid_disk >= 0 &&
9138 !test_bit(In_sync, &rdev->flags) &&
9139 !test_bit(Journal, &rdev->flags) &&
9140 !test_bit(Faulty, &rdev->flags))
9142 if (rdev->raid_disk >= 0)
9144 if (test_bit(Faulty, &rdev->flags))
9146 if (!test_bit(Journal, &rdev->flags)) {
9148 ! (rdev->saved_raid_disk >= 0 &&
9149 !test_bit(Bitmap_sync, &rdev->flags)))
9152 rdev->recovery_offset = 0;
9154 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9155 /* failure here is OK */
9156 sysfs_link_rdev(mddev, rdev);
9157 if (!test_bit(Journal, &rdev->flags))
9159 md_new_event(mddev);
9160 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9165 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9169 static void md_start_sync(struct work_struct *ws)
9171 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9173 mddev->sync_thread = md_register_thread(md_do_sync,
9176 if (!mddev->sync_thread) {
9177 pr_warn("%s: could not start resync thread...\n",
9179 /* leave the spares where they are, it shouldn't hurt */
9180 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9181 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9182 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9183 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9184 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9185 wake_up(&resync_wait);
9186 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9188 if (mddev->sysfs_action)
9189 sysfs_notify_dirent_safe(mddev->sysfs_action);
9191 md_wakeup_thread(mddev->sync_thread);
9192 sysfs_notify_dirent_safe(mddev->sysfs_action);
9193 md_new_event(mddev);
9197 * This routine is regularly called by all per-raid-array threads to
9198 * deal with generic issues like resync and super-block update.
9199 * Raid personalities that don't have a thread (linear/raid0) do not
9200 * need this as they never do any recovery or update the superblock.
9202 * It does not do any resync itself, but rather "forks" off other threads
9203 * to do that as needed.
9204 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9205 * "->recovery" and create a thread at ->sync_thread.
9206 * When the thread finishes it sets MD_RECOVERY_DONE
9207 * and wakeups up this thread which will reap the thread and finish up.
9208 * This thread also removes any faulty devices (with nr_pending == 0).
9210 * The overall approach is:
9211 * 1/ if the superblock needs updating, update it.
9212 * 2/ If a recovery thread is running, don't do anything else.
9213 * 3/ If recovery has finished, clean up, possibly marking spares active.
9214 * 4/ If there are any faulty devices, remove them.
9215 * 5/ If array is degraded, try to add spares devices
9216 * 6/ If array has spares or is not in-sync, start a resync thread.
9218 void md_check_recovery(struct mddev *mddev)
9220 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9221 /* Write superblock - thread that called mddev_suspend()
9222 * holds reconfig_mutex for us.
9224 set_bit(MD_UPDATING_SB, &mddev->flags);
9225 smp_mb__after_atomic();
9226 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9227 md_update_sb(mddev, 0);
9228 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9229 wake_up(&mddev->sb_wait);
9232 if (mddev->suspended)
9236 md_bitmap_daemon_work(mddev);
9238 if (signal_pending(current)) {
9239 if (mddev->pers->sync_request && !mddev->external) {
9240 pr_debug("md: %s in immediate safe mode\n",
9242 mddev->safemode = 2;
9244 flush_signals(current);
9247 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9250 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9251 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9252 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9253 (mddev->external == 0 && mddev->safemode == 1) ||
9254 (mddev->safemode == 2
9255 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9259 if (mddev_trylock(mddev)) {
9261 bool try_set_sync = mddev->safemode != 0;
9263 if (!mddev->external && mddev->safemode == 1)
9264 mddev->safemode = 0;
9267 struct md_rdev *rdev;
9268 if (!mddev->external && mddev->in_sync)
9269 /* 'Blocked' flag not needed as failed devices
9270 * will be recorded if array switched to read/write.
9271 * Leaving it set will prevent the device
9272 * from being removed.
9274 rdev_for_each(rdev, mddev)
9275 clear_bit(Blocked, &rdev->flags);
9276 /* On a read-only array we can:
9277 * - remove failed devices
9278 * - add already-in_sync devices if the array itself
9280 * As we only add devices that are already in-sync,
9281 * we can activate the spares immediately.
9283 remove_and_add_spares(mddev, NULL);
9284 /* There is no thread, but we need to call
9285 * ->spare_active and clear saved_raid_disk
9287 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9288 md_reap_sync_thread(mddev);
9289 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9290 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9291 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9295 if (mddev_is_clustered(mddev)) {
9296 struct md_rdev *rdev, *tmp;
9297 /* kick the device if another node issued a
9300 rdev_for_each_safe(rdev, tmp, mddev) {
9301 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9302 rdev->raid_disk < 0)
9303 md_kick_rdev_from_array(rdev);
9307 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9308 spin_lock(&mddev->lock);
9310 spin_unlock(&mddev->lock);
9313 if (mddev->sb_flags)
9314 md_update_sb(mddev, 0);
9316 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9317 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9318 /* resync/recovery still happening */
9319 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9322 if (mddev->sync_thread) {
9323 md_reap_sync_thread(mddev);
9326 /* Set RUNNING before clearing NEEDED to avoid
9327 * any transients in the value of "sync_action".
9329 mddev->curr_resync_completed = 0;
9330 spin_lock(&mddev->lock);
9331 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9332 spin_unlock(&mddev->lock);
9333 /* Clear some bits that don't mean anything, but
9336 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9337 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9339 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9340 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9342 /* no recovery is running.
9343 * remove any failed drives, then
9344 * add spares if possible.
9345 * Spares are also removed and re-added, to allow
9346 * the personality to fail the re-add.
9349 if (mddev->reshape_position != MaxSector) {
9350 if (mddev->pers->check_reshape == NULL ||
9351 mddev->pers->check_reshape(mddev) != 0)
9352 /* Cannot proceed */
9354 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9355 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9356 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9357 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9358 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9359 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9360 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9361 } else if (mddev->recovery_cp < MaxSector) {
9362 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9363 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9364 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9365 /* nothing to be done ... */
9368 if (mddev->pers->sync_request) {
9370 /* We are adding a device or devices to an array
9371 * which has the bitmap stored on all devices.
9372 * So make sure all bitmap pages get written
9374 md_bitmap_write_all(mddev->bitmap);
9376 INIT_WORK(&mddev->del_work, md_start_sync);
9377 queue_work(md_misc_wq, &mddev->del_work);
9381 if (!mddev->sync_thread) {
9382 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9383 wake_up(&resync_wait);
9384 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9386 if (mddev->sysfs_action)
9387 sysfs_notify_dirent_safe(mddev->sysfs_action);
9390 wake_up(&mddev->sb_wait);
9391 mddev_unlock(mddev);
9394 EXPORT_SYMBOL(md_check_recovery);
9396 void md_reap_sync_thread(struct mddev *mddev)
9398 struct md_rdev *rdev;
9399 sector_t old_dev_sectors = mddev->dev_sectors;
9400 bool is_reshaped = false;
9402 /* resync has finished, collect result */
9403 md_unregister_thread(&mddev->sync_thread);
9404 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9405 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9406 mddev->degraded != mddev->raid_disks) {
9408 /* activate any spares */
9409 if (mddev->pers->spare_active(mddev)) {
9410 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9411 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9414 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9415 mddev->pers->finish_reshape) {
9416 mddev->pers->finish_reshape(mddev);
9417 if (mddev_is_clustered(mddev))
9421 /* If array is no-longer degraded, then any saved_raid_disk
9422 * information must be scrapped.
9424 if (!mddev->degraded)
9425 rdev_for_each(rdev, mddev)
9426 rdev->saved_raid_disk = -1;
9428 md_update_sb(mddev, 1);
9429 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9430 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9432 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9433 md_cluster_ops->resync_finish(mddev);
9434 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9435 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9436 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9437 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9438 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9439 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9441 * We call md_cluster_ops->update_size here because sync_size could
9442 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9443 * so it is time to update size across cluster.
9445 if (mddev_is_clustered(mddev) && is_reshaped
9446 && !test_bit(MD_CLOSING, &mddev->flags))
9447 md_cluster_ops->update_size(mddev, old_dev_sectors);
9448 wake_up(&resync_wait);
9449 /* flag recovery needed just to double check */
9450 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9451 sysfs_notify_dirent_safe(mddev->sysfs_action);
9452 md_new_event(mddev);
9453 if (mddev->event_work.func)
9454 queue_work(md_misc_wq, &mddev->event_work);
9456 EXPORT_SYMBOL(md_reap_sync_thread);
9458 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9460 sysfs_notify_dirent_safe(rdev->sysfs_state);
9461 wait_event_timeout(rdev->blocked_wait,
9462 !test_bit(Blocked, &rdev->flags) &&
9463 !test_bit(BlockedBadBlocks, &rdev->flags),
9464 msecs_to_jiffies(5000));
9465 rdev_dec_pending(rdev, mddev);
9467 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9469 void md_finish_reshape(struct mddev *mddev)
9471 /* called be personality module when reshape completes. */
9472 struct md_rdev *rdev;
9474 rdev_for_each(rdev, mddev) {
9475 if (rdev->data_offset > rdev->new_data_offset)
9476 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9478 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9479 rdev->data_offset = rdev->new_data_offset;
9482 EXPORT_SYMBOL(md_finish_reshape);
9484 /* Bad block management */
9486 /* Returns 1 on success, 0 on failure */
9487 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9490 struct mddev *mddev = rdev->mddev;
9493 s += rdev->new_data_offset;
9495 s += rdev->data_offset;
9496 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9498 /* Make sure they get written out promptly */
9499 if (test_bit(ExternalBbl, &rdev->flags))
9500 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9501 sysfs_notify_dirent_safe(rdev->sysfs_state);
9502 set_mask_bits(&mddev->sb_flags, 0,
9503 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9504 md_wakeup_thread(rdev->mddev->thread);
9509 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9511 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9516 s += rdev->new_data_offset;
9518 s += rdev->data_offset;
9519 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9520 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9521 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9524 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9526 static int md_notify_reboot(struct notifier_block *this,
9527 unsigned long code, void *x)
9529 struct list_head *tmp;
9530 struct mddev *mddev;
9533 for_each_mddev(mddev, tmp) {
9534 if (mddev_trylock(mddev)) {
9536 __md_stop_writes(mddev);
9537 if (mddev->persistent)
9538 mddev->safemode = 2;
9539 mddev_unlock(mddev);
9544 * certain more exotic SCSI devices are known to be
9545 * volatile wrt too early system reboots. While the
9546 * right place to handle this issue is the given
9547 * driver, we do want to have a safe RAID driver ...
9555 static struct notifier_block md_notifier = {
9556 .notifier_call = md_notify_reboot,
9558 .priority = INT_MAX, /* before any real devices */
9561 static void md_geninit(void)
9563 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9565 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9568 static int __init md_init(void)
9572 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9576 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9580 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9581 if (!md_rdev_misc_wq)
9582 goto err_rdev_misc_wq;
9584 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9588 ret = __register_blkdev(0, "mdp", md_probe);
9593 register_reboot_notifier(&md_notifier);
9594 raid_table_header = register_sysctl_table(raid_root_table);
9600 unregister_blkdev(MD_MAJOR, "md");
9602 destroy_workqueue(md_rdev_misc_wq);
9604 destroy_workqueue(md_misc_wq);
9606 destroy_workqueue(md_wq);
9611 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9613 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9614 struct md_rdev *rdev2, *tmp;
9616 char b[BDEVNAME_SIZE];
9619 * If size is changed in another node then we need to
9620 * do resize as well.
9622 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9623 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9625 pr_info("md-cluster: resize failed\n");
9627 md_bitmap_update_sb(mddev->bitmap);
9630 /* Check for change of roles in the active devices */
9631 rdev_for_each_safe(rdev2, tmp, mddev) {
9632 if (test_bit(Faulty, &rdev2->flags))
9635 /* Check if the roles changed */
9636 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9638 if (test_bit(Candidate, &rdev2->flags)) {
9639 if (role == 0xfffe) {
9640 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9641 md_kick_rdev_from_array(rdev2);
9645 clear_bit(Candidate, &rdev2->flags);
9648 if (role != rdev2->raid_disk) {
9650 * got activated except reshape is happening.
9652 if (rdev2->raid_disk == -1 && role != 0xffff &&
9653 !(le32_to_cpu(sb->feature_map) &
9654 MD_FEATURE_RESHAPE_ACTIVE)) {
9655 rdev2->saved_raid_disk = role;
9656 ret = remove_and_add_spares(mddev, rdev2);
9657 pr_info("Activated spare: %s\n",
9658 bdevname(rdev2->bdev,b));
9659 /* wakeup mddev->thread here, so array could
9660 * perform resync with the new activated disk */
9661 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9662 md_wakeup_thread(mddev->thread);
9665 * We just want to do the minimum to mark the disk
9666 * as faulty. The recovery is performed by the
9667 * one who initiated the error.
9669 if ((role == 0xfffe) || (role == 0xfffd)) {
9670 md_error(mddev, rdev2);
9671 clear_bit(Blocked, &rdev2->flags);
9676 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9677 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9679 pr_warn("md: updating array disks failed. %d\n", ret);
9683 * Since mddev->delta_disks has already updated in update_raid_disks,
9684 * so it is time to check reshape.
9686 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9687 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9689 * reshape is happening in the remote node, we need to
9690 * update reshape_position and call start_reshape.
9692 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9693 if (mddev->pers->update_reshape_pos)
9694 mddev->pers->update_reshape_pos(mddev);
9695 if (mddev->pers->start_reshape)
9696 mddev->pers->start_reshape(mddev);
9697 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9698 mddev->reshape_position != MaxSector &&
9699 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9700 /* reshape is just done in another node. */
9701 mddev->reshape_position = MaxSector;
9702 if (mddev->pers->update_reshape_pos)
9703 mddev->pers->update_reshape_pos(mddev);
9706 /* Finally set the event to be up to date */
9707 mddev->events = le64_to_cpu(sb->events);
9710 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9713 struct page *swapout = rdev->sb_page;
9714 struct mdp_superblock_1 *sb;
9716 /* Store the sb page of the rdev in the swapout temporary
9717 * variable in case we err in the future
9719 rdev->sb_page = NULL;
9720 err = alloc_disk_sb(rdev);
9722 ClearPageUptodate(rdev->sb_page);
9723 rdev->sb_loaded = 0;
9724 err = super_types[mddev->major_version].
9725 load_super(rdev, NULL, mddev->minor_version);
9728 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9729 __func__, __LINE__, rdev->desc_nr, err);
9731 put_page(rdev->sb_page);
9732 rdev->sb_page = swapout;
9733 rdev->sb_loaded = 1;
9737 sb = page_address(rdev->sb_page);
9738 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9742 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9743 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9745 /* The other node finished recovery, call spare_active to set
9746 * device In_sync and mddev->degraded
9748 if (rdev->recovery_offset == MaxSector &&
9749 !test_bit(In_sync, &rdev->flags) &&
9750 mddev->pers->spare_active(mddev))
9751 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9757 void md_reload_sb(struct mddev *mddev, int nr)
9759 struct md_rdev *rdev;
9763 rdev_for_each_rcu(rdev, mddev) {
9764 if (rdev->desc_nr == nr)
9768 if (!rdev || rdev->desc_nr != nr) {
9769 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9773 err = read_rdev(mddev, rdev);
9777 check_sb_changes(mddev, rdev);
9779 /* Read all rdev's to update recovery_offset */
9780 rdev_for_each_rcu(rdev, mddev) {
9781 if (!test_bit(Faulty, &rdev->flags))
9782 read_rdev(mddev, rdev);
9785 EXPORT_SYMBOL(md_reload_sb);
9790 * Searches all registered partitions for autorun RAID arrays
9794 static DEFINE_MUTEX(detected_devices_mutex);
9795 static LIST_HEAD(all_detected_devices);
9796 struct detected_devices_node {
9797 struct list_head list;
9801 void md_autodetect_dev(dev_t dev)
9803 struct detected_devices_node *node_detected_dev;
9805 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9806 if (node_detected_dev) {
9807 node_detected_dev->dev = dev;
9808 mutex_lock(&detected_devices_mutex);
9809 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9810 mutex_unlock(&detected_devices_mutex);
9814 void md_autostart_arrays(int part)
9816 struct md_rdev *rdev;
9817 struct detected_devices_node *node_detected_dev;
9819 int i_scanned, i_passed;
9824 pr_info("md: Autodetecting RAID arrays.\n");
9826 mutex_lock(&detected_devices_mutex);
9827 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9829 node_detected_dev = list_entry(all_detected_devices.next,
9830 struct detected_devices_node, list);
9831 list_del(&node_detected_dev->list);
9832 dev = node_detected_dev->dev;
9833 kfree(node_detected_dev);
9834 mutex_unlock(&detected_devices_mutex);
9835 rdev = md_import_device(dev,0, 90);
9836 mutex_lock(&detected_devices_mutex);
9840 if (test_bit(Faulty, &rdev->flags))
9843 set_bit(AutoDetected, &rdev->flags);
9844 list_add(&rdev->same_set, &pending_raid_disks);
9847 mutex_unlock(&detected_devices_mutex);
9849 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9851 autorun_devices(part);
9854 #endif /* !MODULE */
9856 static __exit void md_exit(void)
9858 struct mddev *mddev;
9859 struct list_head *tmp;
9862 unregister_blkdev(MD_MAJOR,"md");
9863 unregister_blkdev(mdp_major, "mdp");
9864 unregister_reboot_notifier(&md_notifier);
9865 unregister_sysctl_table(raid_table_header);
9867 /* We cannot unload the modules while some process is
9868 * waiting for us in select() or poll() - wake them up
9871 while (waitqueue_active(&md_event_waiters)) {
9872 /* not safe to leave yet */
9873 wake_up(&md_event_waiters);
9877 remove_proc_entry("mdstat", NULL);
9879 for_each_mddev(mddev, tmp) {
9880 export_array(mddev);
9882 mddev->hold_active = 0;
9884 * for_each_mddev() will call mddev_put() at the end of each
9885 * iteration. As the mddev is now fully clear, this will
9886 * schedule the mddev for destruction by a workqueue, and the
9887 * destroy_workqueue() below will wait for that to complete.
9890 destroy_workqueue(md_rdev_misc_wq);
9891 destroy_workqueue(md_misc_wq);
9892 destroy_workqueue(md_wq);
9895 subsys_initcall(md_init);
9896 module_exit(md_exit)
9898 static int get_ro(char *buffer, const struct kernel_param *kp)
9900 return sprintf(buffer, "%d\n", start_readonly);
9902 static int set_ro(const char *val, const struct kernel_param *kp)
9904 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9907 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9908 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9909 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9910 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9912 MODULE_LICENSE("GPL");
9913 MODULE_DESCRIPTION("MD RAID framework");
9915 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);