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/badblocks.h>
45 #include <linux/sysctl.h>
46 #include <linux/seq_file.h>
48 #include <linux/poll.h>
49 #include <linux/ctype.h>
50 #include <linux/string.h>
51 #include <linux/hdreg.h>
52 #include <linux/proc_fs.h>
53 #include <linux/random.h>
54 #include <linux/module.h>
55 #include <linux/reboot.h>
56 #include <linux/file.h>
57 #include <linux/compat.h>
58 #include <linux/delay.h>
59 #include <linux/raid/md_p.h>
60 #include <linux/raid/md_u.h>
61 #include <linux/raid/detect.h>
62 #include <linux/slab.h>
63 #include <linux/percpu-refcount.h>
64 #include <linux/part_stat.h>
66 #include <trace/events/block.h>
68 #include "md-bitmap.h"
69 #include "md-cluster.h"
71 /* pers_list is a list of registered personalities protected
73 * pers_lock does extra service to protect accesses to
74 * mddev->thread when the mutex cannot be held.
76 static LIST_HEAD(pers_list);
77 static DEFINE_SPINLOCK(pers_lock);
79 static struct kobj_type md_ktype;
81 struct md_cluster_operations *md_cluster_ops;
82 EXPORT_SYMBOL(md_cluster_ops);
83 static struct module *md_cluster_mod;
85 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
86 static struct workqueue_struct *md_wq;
87 static struct workqueue_struct *md_misc_wq;
88 static struct workqueue_struct *md_rdev_misc_wq;
90 static int remove_and_add_spares(struct mddev *mddev,
91 struct md_rdev *this);
92 static void mddev_detach(struct mddev *mddev);
95 * Default number of read corrections we'll attempt on an rdev
96 * before ejecting it from the array. We divide the read error
97 * count by 2 for every hour elapsed between read errors.
99 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
100 /* Default safemode delay: 200 msec */
101 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
103 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
104 * is 1000 KB/sec, so the extra system load does not show up that much.
105 * Increase it if you want to have more _guaranteed_ speed. Note that
106 * the RAID driver will use the maximum available bandwidth if the IO
107 * subsystem is idle. There is also an 'absolute maximum' reconstruction
108 * speed limit - in case reconstruction slows down your system despite
111 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
112 * or /sys/block/mdX/md/sync_speed_{min,max}
115 static int sysctl_speed_limit_min = 1000;
116 static int sysctl_speed_limit_max = 200000;
117 static inline int speed_min(struct mddev *mddev)
119 return mddev->sync_speed_min ?
120 mddev->sync_speed_min : sysctl_speed_limit_min;
123 static inline int speed_max(struct mddev *mddev)
125 return mddev->sync_speed_max ?
126 mddev->sync_speed_max : sysctl_speed_limit_max;
129 static void rdev_uninit_serial(struct md_rdev *rdev)
131 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
134 kvfree(rdev->serial);
138 static void rdevs_uninit_serial(struct mddev *mddev)
140 struct md_rdev *rdev;
142 rdev_for_each(rdev, mddev)
143 rdev_uninit_serial(rdev);
146 static int rdev_init_serial(struct md_rdev *rdev)
148 /* serial_nums equals with BARRIER_BUCKETS_NR */
149 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
150 struct serial_in_rdev *serial = NULL;
152 if (test_bit(CollisionCheck, &rdev->flags))
155 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
160 for (i = 0; i < serial_nums; i++) {
161 struct serial_in_rdev *serial_tmp = &serial[i];
163 spin_lock_init(&serial_tmp->serial_lock);
164 serial_tmp->serial_rb = RB_ROOT_CACHED;
165 init_waitqueue_head(&serial_tmp->serial_io_wait);
168 rdev->serial = serial;
169 set_bit(CollisionCheck, &rdev->flags);
174 static int rdevs_init_serial(struct mddev *mddev)
176 struct md_rdev *rdev;
179 rdev_for_each(rdev, mddev) {
180 ret = rdev_init_serial(rdev);
185 /* Free all resources if pool is not existed */
186 if (ret && !mddev->serial_info_pool)
187 rdevs_uninit_serial(mddev);
193 * rdev needs to enable serial stuffs if it meets the conditions:
194 * 1. it is multi-queue device flaged with writemostly.
195 * 2. the write-behind mode is enabled.
197 static int rdev_need_serial(struct md_rdev *rdev)
199 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
200 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
201 test_bit(WriteMostly, &rdev->flags));
205 * Init resource for rdev(s), then create serial_info_pool if:
206 * 1. rdev is the first device which return true from rdev_enable_serial.
207 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
209 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
214 if (rdev && !rdev_need_serial(rdev) &&
215 !test_bit(CollisionCheck, &rdev->flags))
219 mddev_suspend(mddev);
222 ret = rdevs_init_serial(mddev);
224 ret = rdev_init_serial(rdev);
228 if (mddev->serial_info_pool == NULL) {
230 * already in memalloc noio context by
233 mddev->serial_info_pool =
234 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
235 sizeof(struct serial_info));
236 if (!mddev->serial_info_pool) {
237 rdevs_uninit_serial(mddev);
238 pr_err("can't alloc memory pool for serialization\n");
248 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
249 * 1. rdev is the last device flaged with CollisionCheck.
250 * 2. when bitmap is destroyed while policy is not enabled.
251 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
253 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
256 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
259 if (mddev->serial_info_pool) {
260 struct md_rdev *temp;
261 int num = 0; /* used to track if other rdevs need the pool */
264 mddev_suspend(mddev);
265 rdev_for_each(temp, mddev) {
267 if (!mddev->serialize_policy ||
268 !rdev_need_serial(temp))
269 rdev_uninit_serial(temp);
272 } else if (temp != rdev &&
273 test_bit(CollisionCheck, &temp->flags))
278 rdev_uninit_serial(rdev);
281 pr_info("The mempool could be used by other devices\n");
283 mempool_destroy(mddev->serial_info_pool);
284 mddev->serial_info_pool = NULL;
291 static struct ctl_table_header *raid_table_header;
293 static struct ctl_table raid_table[] = {
295 .procname = "speed_limit_min",
296 .data = &sysctl_speed_limit_min,
297 .maxlen = sizeof(int),
298 .mode = S_IRUGO|S_IWUSR,
299 .proc_handler = proc_dointvec,
302 .procname = "speed_limit_max",
303 .data = &sysctl_speed_limit_max,
304 .maxlen = sizeof(int),
305 .mode = S_IRUGO|S_IWUSR,
306 .proc_handler = proc_dointvec,
311 static struct ctl_table raid_dir_table[] = {
315 .mode = S_IRUGO|S_IXUGO,
321 static struct ctl_table raid_root_table[] = {
326 .child = raid_dir_table,
331 static int start_readonly;
334 * The original mechanism for creating an md device is to create
335 * a device node in /dev and to open it. This causes races with device-close.
336 * The preferred method is to write to the "new_array" module parameter.
337 * This can avoid races.
338 * Setting create_on_open to false disables the original mechanism
339 * so all the races disappear.
341 static bool create_on_open = true;
343 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
346 if (!mddev || !bioset_initialized(&mddev->bio_set))
347 return bio_alloc(gfp_mask, nr_iovecs);
349 return bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set);
351 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
353 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
355 if (!mddev || !bioset_initialized(&mddev->sync_set))
356 return bio_alloc(GFP_NOIO, 1);
358 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
362 * We have a system wide 'event count' that is incremented
363 * on any 'interesting' event, and readers of /proc/mdstat
364 * can use 'poll' or 'select' to find out when the event
368 * start array, stop array, error, add device, remove device,
369 * start build, activate spare
371 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
372 static atomic_t md_event_count;
373 void md_new_event(struct mddev *mddev)
375 atomic_inc(&md_event_count);
376 wake_up(&md_event_waiters);
378 EXPORT_SYMBOL_GPL(md_new_event);
381 * Enables to iterate over all existing md arrays
382 * all_mddevs_lock protects this list.
384 static LIST_HEAD(all_mddevs);
385 static DEFINE_SPINLOCK(all_mddevs_lock);
388 * iterates through all used mddevs in the system.
389 * We take care to grab the all_mddevs_lock whenever navigating
390 * the list, and to always hold a refcount when unlocked.
391 * Any code which breaks out of this loop while own
392 * a reference to the current mddev and must mddev_put it.
394 #define for_each_mddev(_mddev,_tmp) \
396 for (({ spin_lock(&all_mddevs_lock); \
397 _tmp = all_mddevs.next; \
399 ({ if (_tmp != &all_mddevs) \
400 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
401 spin_unlock(&all_mddevs_lock); \
402 if (_mddev) mddev_put(_mddev); \
403 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
404 _tmp != &all_mddevs;}); \
405 ({ spin_lock(&all_mddevs_lock); \
406 _tmp = _tmp->next;}) \
409 /* Rather than calling directly into the personality make_request function,
410 * IO requests come here first so that we can check if the device is
411 * being suspended pending a reconfiguration.
412 * We hold a refcount over the call to ->make_request. By the time that
413 * call has finished, the bio has been linked into some internal structure
414 * and so is visible to ->quiesce(), so we don't need the refcount any more.
416 static bool is_suspended(struct mddev *mddev, struct bio *bio)
418 if (mddev->suspended)
420 if (bio_data_dir(bio) != WRITE)
422 if (mddev->suspend_lo >= mddev->suspend_hi)
424 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
426 if (bio_end_sector(bio) < mddev->suspend_lo)
431 void md_handle_request(struct mddev *mddev, struct bio *bio)
435 if (is_suspended(mddev, bio)) {
438 prepare_to_wait(&mddev->sb_wait, &__wait,
439 TASK_UNINTERRUPTIBLE);
440 if (!is_suspended(mddev, bio))
446 finish_wait(&mddev->sb_wait, &__wait);
448 atomic_inc(&mddev->active_io);
451 if (!mddev->pers->make_request(mddev, bio)) {
452 atomic_dec(&mddev->active_io);
453 wake_up(&mddev->sb_wait);
454 goto check_suspended;
457 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
458 wake_up(&mddev->sb_wait);
460 EXPORT_SYMBOL(md_handle_request);
462 static blk_qc_t md_submit_bio(struct bio *bio)
464 const int rw = bio_data_dir(bio);
465 const int sgrp = op_stat_group(bio_op(bio));
466 struct mddev *mddev = bio->bi_disk->private_data;
467 unsigned int sectors;
469 if (mddev == NULL || mddev->pers == NULL) {
471 return BLK_QC_T_NONE;
474 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
476 return BLK_QC_T_NONE;
479 blk_queue_split(&bio);
481 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
482 if (bio_sectors(bio) != 0)
483 bio->bi_status = BLK_STS_IOERR;
485 return BLK_QC_T_NONE;
489 * save the sectors now since our bio can
490 * go away inside make_request
492 sectors = bio_sectors(bio);
493 /* bio could be mergeable after passing to underlayer */
494 bio->bi_opf &= ~REQ_NOMERGE;
496 md_handle_request(mddev, bio);
499 part_stat_inc(&mddev->gendisk->part0, ios[sgrp]);
500 part_stat_add(&mddev->gendisk->part0, sectors[sgrp], sectors);
503 return BLK_QC_T_NONE;
506 /* mddev_suspend makes sure no new requests are submitted
507 * to the device, and that any requests that have been submitted
508 * are completely handled.
509 * Once mddev_detach() is called and completes, the module will be
512 void mddev_suspend(struct mddev *mddev)
514 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
515 lockdep_assert_held(&mddev->reconfig_mutex);
516 if (mddev->suspended++)
519 wake_up(&mddev->sb_wait);
520 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
521 smp_mb__after_atomic();
522 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
523 mddev->pers->quiesce(mddev, 1);
524 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
525 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
527 del_timer_sync(&mddev->safemode_timer);
528 /* restrict memory reclaim I/O during raid array is suspend */
529 mddev->noio_flag = memalloc_noio_save();
531 EXPORT_SYMBOL_GPL(mddev_suspend);
533 void mddev_resume(struct mddev *mddev)
535 /* entred the memalloc scope from mddev_suspend() */
536 memalloc_noio_restore(mddev->noio_flag);
537 lockdep_assert_held(&mddev->reconfig_mutex);
538 if (--mddev->suspended)
540 wake_up(&mddev->sb_wait);
541 mddev->pers->quiesce(mddev, 0);
543 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
544 md_wakeup_thread(mddev->thread);
545 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
547 EXPORT_SYMBOL_GPL(mddev_resume);
550 * Generic flush handling for md
553 static void md_end_flush(struct bio *bio)
555 struct md_rdev *rdev = bio->bi_private;
556 struct mddev *mddev = rdev->mddev;
560 rdev_dec_pending(rdev, mddev);
562 if (atomic_dec_and_test(&mddev->flush_pending)) {
563 /* The pre-request flush has finished */
564 queue_work(md_wq, &mddev->flush_work);
568 static void md_submit_flush_data(struct work_struct *ws);
570 static void submit_flushes(struct work_struct *ws)
572 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
573 struct md_rdev *rdev;
575 mddev->start_flush = ktime_get_boottime();
576 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
577 atomic_set(&mddev->flush_pending, 1);
579 rdev_for_each_rcu(rdev, mddev)
580 if (rdev->raid_disk >= 0 &&
581 !test_bit(Faulty, &rdev->flags)) {
582 /* Take two references, one is dropped
583 * when request finishes, one after
584 * we reclaim rcu_read_lock
587 atomic_inc(&rdev->nr_pending);
588 atomic_inc(&rdev->nr_pending);
590 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
591 bi->bi_end_io = md_end_flush;
592 bi->bi_private = rdev;
593 bio_set_dev(bi, rdev->bdev);
594 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
595 atomic_inc(&mddev->flush_pending);
598 rdev_dec_pending(rdev, mddev);
601 if (atomic_dec_and_test(&mddev->flush_pending))
602 queue_work(md_wq, &mddev->flush_work);
605 static void md_submit_flush_data(struct work_struct *ws)
607 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
608 struct bio *bio = mddev->flush_bio;
611 * must reset flush_bio before calling into md_handle_request to avoid a
612 * deadlock, because other bios passed md_handle_request suspend check
613 * could wait for this and below md_handle_request could wait for those
614 * bios because of suspend check
616 spin_lock_irq(&mddev->lock);
617 mddev->last_flush = mddev->start_flush;
618 mddev->flush_bio = NULL;
619 spin_unlock_irq(&mddev->lock);
620 wake_up(&mddev->sb_wait);
622 if (bio->bi_iter.bi_size == 0) {
623 /* an empty barrier - all done */
626 bio->bi_opf &= ~REQ_PREFLUSH;
627 md_handle_request(mddev, bio);
632 * Manages consolidation of flushes and submitting any flushes needed for
633 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
634 * being finished in another context. Returns false if the flushing is
635 * complete but still needs the I/O portion of the bio to be processed.
637 bool md_flush_request(struct mddev *mddev, struct bio *bio)
639 ktime_t start = ktime_get_boottime();
640 spin_lock_irq(&mddev->lock);
641 wait_event_lock_irq(mddev->sb_wait,
643 ktime_after(mddev->last_flush, start),
645 if (!ktime_after(mddev->last_flush, start)) {
646 WARN_ON(mddev->flush_bio);
647 mddev->flush_bio = bio;
650 spin_unlock_irq(&mddev->lock);
653 INIT_WORK(&mddev->flush_work, submit_flushes);
654 queue_work(md_wq, &mddev->flush_work);
656 /* flush was performed for some other bio while we waited. */
657 if (bio->bi_iter.bi_size == 0)
658 /* an empty barrier - all done */
661 bio->bi_opf &= ~REQ_PREFLUSH;
667 EXPORT_SYMBOL(md_flush_request);
669 static inline struct mddev *mddev_get(struct mddev *mddev)
671 atomic_inc(&mddev->active);
675 static void mddev_delayed_delete(struct work_struct *ws);
677 static void mddev_put(struct mddev *mddev)
679 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
681 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
682 mddev->ctime == 0 && !mddev->hold_active) {
683 /* Array is not configured at all, and not held active,
685 list_del_init(&mddev->all_mddevs);
688 * Call queue_work inside the spinlock so that
689 * flush_workqueue() after mddev_find will succeed in waiting
690 * for the work to be done.
692 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
693 queue_work(md_misc_wq, &mddev->del_work);
695 spin_unlock(&all_mddevs_lock);
698 static void md_safemode_timeout(struct timer_list *t);
700 void mddev_init(struct mddev *mddev)
702 kobject_init(&mddev->kobj, &md_ktype);
703 mutex_init(&mddev->open_mutex);
704 mutex_init(&mddev->reconfig_mutex);
705 mutex_init(&mddev->bitmap_info.mutex);
706 INIT_LIST_HEAD(&mddev->disks);
707 INIT_LIST_HEAD(&mddev->all_mddevs);
708 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
709 atomic_set(&mddev->active, 1);
710 atomic_set(&mddev->openers, 0);
711 atomic_set(&mddev->active_io, 0);
712 spin_lock_init(&mddev->lock);
713 atomic_set(&mddev->flush_pending, 0);
714 init_waitqueue_head(&mddev->sb_wait);
715 init_waitqueue_head(&mddev->recovery_wait);
716 mddev->reshape_position = MaxSector;
717 mddev->reshape_backwards = 0;
718 mddev->last_sync_action = "none";
719 mddev->resync_min = 0;
720 mddev->resync_max = MaxSector;
721 mddev->level = LEVEL_NONE;
723 EXPORT_SYMBOL_GPL(mddev_init);
725 static struct mddev *mddev_find_locked(dev_t unit)
729 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
730 if (mddev->unit == unit)
736 static struct mddev *mddev_find(dev_t unit)
740 if (MAJOR(unit) != MD_MAJOR)
741 unit &= ~((1 << MdpMinorShift) - 1);
743 spin_lock(&all_mddevs_lock);
744 mddev = mddev_find_locked(unit);
747 spin_unlock(&all_mddevs_lock);
752 static struct mddev *mddev_find_or_alloc(dev_t unit)
754 struct mddev *mddev, *new = NULL;
756 if (unit && MAJOR(unit) != MD_MAJOR)
757 unit &= ~((1<<MdpMinorShift)-1);
760 spin_lock(&all_mddevs_lock);
763 mddev = mddev_find_locked(unit);
766 spin_unlock(&all_mddevs_lock);
772 list_add(&new->all_mddevs, &all_mddevs);
773 spin_unlock(&all_mddevs_lock);
774 new->hold_active = UNTIL_IOCTL;
778 /* find an unused unit number */
779 static int next_minor = 512;
780 int start = next_minor;
784 dev = MKDEV(MD_MAJOR, next_minor);
786 if (next_minor > MINORMASK)
788 if (next_minor == start) {
789 /* Oh dear, all in use. */
790 spin_unlock(&all_mddevs_lock);
795 is_free = !mddev_find_locked(dev);
798 new->md_minor = MINOR(dev);
799 new->hold_active = UNTIL_STOP;
800 list_add(&new->all_mddevs, &all_mddevs);
801 spin_unlock(&all_mddevs_lock);
804 spin_unlock(&all_mddevs_lock);
806 new = kzalloc(sizeof(*new), GFP_KERNEL);
811 if (MAJOR(unit) == MD_MAJOR)
812 new->md_minor = MINOR(unit);
814 new->md_minor = MINOR(unit) >> MdpMinorShift;
821 static struct attribute_group md_redundancy_group;
823 void mddev_unlock(struct mddev *mddev)
825 if (mddev->to_remove) {
826 /* These cannot be removed under reconfig_mutex as
827 * an access to the files will try to take reconfig_mutex
828 * while holding the file unremovable, which leads to
830 * So hold set sysfs_active while the remove in happeing,
831 * and anything else which might set ->to_remove or my
832 * otherwise change the sysfs namespace will fail with
833 * -EBUSY if sysfs_active is still set.
834 * We set sysfs_active under reconfig_mutex and elsewhere
835 * test it under the same mutex to ensure its correct value
838 struct attribute_group *to_remove = mddev->to_remove;
839 mddev->to_remove = NULL;
840 mddev->sysfs_active = 1;
841 mutex_unlock(&mddev->reconfig_mutex);
843 if (mddev->kobj.sd) {
844 if (to_remove != &md_redundancy_group)
845 sysfs_remove_group(&mddev->kobj, to_remove);
846 if (mddev->pers == NULL ||
847 mddev->pers->sync_request == NULL) {
848 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
849 if (mddev->sysfs_action)
850 sysfs_put(mddev->sysfs_action);
851 if (mddev->sysfs_completed)
852 sysfs_put(mddev->sysfs_completed);
853 if (mddev->sysfs_degraded)
854 sysfs_put(mddev->sysfs_degraded);
855 mddev->sysfs_action = NULL;
856 mddev->sysfs_completed = NULL;
857 mddev->sysfs_degraded = NULL;
860 mddev->sysfs_active = 0;
862 mutex_unlock(&mddev->reconfig_mutex);
864 /* As we've dropped the mutex we need a spinlock to
865 * make sure the thread doesn't disappear
867 spin_lock(&pers_lock);
868 md_wakeup_thread(mddev->thread);
869 wake_up(&mddev->sb_wait);
870 spin_unlock(&pers_lock);
872 EXPORT_SYMBOL_GPL(mddev_unlock);
874 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
876 struct md_rdev *rdev;
878 rdev_for_each_rcu(rdev, mddev)
879 if (rdev->desc_nr == nr)
884 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
886 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
888 struct md_rdev *rdev;
890 rdev_for_each(rdev, mddev)
891 if (rdev->bdev->bd_dev == dev)
897 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
899 struct md_rdev *rdev;
901 rdev_for_each_rcu(rdev, mddev)
902 if (rdev->bdev->bd_dev == dev)
907 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
909 static struct md_personality *find_pers(int level, char *clevel)
911 struct md_personality *pers;
912 list_for_each_entry(pers, &pers_list, list) {
913 if (level != LEVEL_NONE && pers->level == level)
915 if (strcmp(pers->name, clevel)==0)
921 /* return the offset of the super block in 512byte sectors */
922 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
924 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
925 return MD_NEW_SIZE_SECTORS(num_sectors);
928 static int alloc_disk_sb(struct md_rdev *rdev)
930 rdev->sb_page = alloc_page(GFP_KERNEL);
936 void md_rdev_clear(struct md_rdev *rdev)
939 put_page(rdev->sb_page);
941 rdev->sb_page = NULL;
946 put_page(rdev->bb_page);
947 rdev->bb_page = NULL;
949 badblocks_exit(&rdev->badblocks);
951 EXPORT_SYMBOL_GPL(md_rdev_clear);
953 static void super_written(struct bio *bio)
955 struct md_rdev *rdev = bio->bi_private;
956 struct mddev *mddev = rdev->mddev;
958 if (bio->bi_status) {
959 pr_err("md: %s gets error=%d\n", __func__,
960 blk_status_to_errno(bio->bi_status));
961 md_error(mddev, rdev);
962 if (!test_bit(Faulty, &rdev->flags)
963 && (bio->bi_opf & MD_FAILFAST)) {
964 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
965 set_bit(LastDev, &rdev->flags);
968 clear_bit(LastDev, &rdev->flags);
972 rdev_dec_pending(rdev, mddev);
974 if (atomic_dec_and_test(&mddev->pending_writes))
975 wake_up(&mddev->sb_wait);
978 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
979 sector_t sector, int size, struct page *page)
981 /* write first size bytes of page to sector of rdev
982 * Increment mddev->pending_writes before returning
983 * and decrement it on completion, waking up sb_wait
984 * if zero is reached.
985 * If an error occurred, call md_error
993 if (test_bit(Faulty, &rdev->flags))
996 bio = md_bio_alloc_sync(mddev);
998 atomic_inc(&rdev->nr_pending);
1000 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
1001 bio->bi_iter.bi_sector = sector;
1002 bio_add_page(bio, page, size, 0);
1003 bio->bi_private = rdev;
1004 bio->bi_end_io = super_written;
1006 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
1007 test_bit(FailFast, &rdev->flags) &&
1008 !test_bit(LastDev, &rdev->flags))
1010 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
1012 atomic_inc(&mddev->pending_writes);
1016 int md_super_wait(struct mddev *mddev)
1018 /* wait for all superblock writes that were scheduled to complete */
1019 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
1020 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
1025 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
1026 struct page *page, int op, int op_flags, bool metadata_op)
1028 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
1031 if (metadata_op && rdev->meta_bdev)
1032 bio_set_dev(bio, rdev->meta_bdev);
1034 bio_set_dev(bio, rdev->bdev);
1035 bio_set_op_attrs(bio, op, op_flags);
1037 bio->bi_iter.bi_sector = sector + rdev->sb_start;
1038 else if (rdev->mddev->reshape_position != MaxSector &&
1039 (rdev->mddev->reshape_backwards ==
1040 (sector >= rdev->mddev->reshape_position)))
1041 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
1043 bio->bi_iter.bi_sector = sector + rdev->data_offset;
1044 bio_add_page(bio, page, size, 0);
1046 submit_bio_wait(bio);
1048 ret = !bio->bi_status;
1052 EXPORT_SYMBOL_GPL(sync_page_io);
1054 static int read_disk_sb(struct md_rdev *rdev, int size)
1056 char b[BDEVNAME_SIZE];
1058 if (rdev->sb_loaded)
1061 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1063 rdev->sb_loaded = 1;
1067 pr_err("md: disabled device %s, could not read superblock.\n",
1068 bdevname(rdev->bdev,b));
1072 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1074 return sb1->set_uuid0 == sb2->set_uuid0 &&
1075 sb1->set_uuid1 == sb2->set_uuid1 &&
1076 sb1->set_uuid2 == sb2->set_uuid2 &&
1077 sb1->set_uuid3 == sb2->set_uuid3;
1080 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1083 mdp_super_t *tmp1, *tmp2;
1085 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1086 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1088 if (!tmp1 || !tmp2) {
1097 * nr_disks is not constant
1102 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1109 static u32 md_csum_fold(u32 csum)
1111 csum = (csum & 0xffff) + (csum >> 16);
1112 return (csum & 0xffff) + (csum >> 16);
1115 static unsigned int calc_sb_csum(mdp_super_t *sb)
1118 u32 *sb32 = (u32*)sb;
1120 unsigned int disk_csum, csum;
1122 disk_csum = sb->sb_csum;
1125 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1127 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1130 /* This used to use csum_partial, which was wrong for several
1131 * reasons including that different results are returned on
1132 * different architectures. It isn't critical that we get exactly
1133 * the same return value as before (we always csum_fold before
1134 * testing, and that removes any differences). However as we
1135 * know that csum_partial always returned a 16bit value on
1136 * alphas, do a fold to maximise conformity to previous behaviour.
1138 sb->sb_csum = md_csum_fold(disk_csum);
1140 sb->sb_csum = disk_csum;
1146 * Handle superblock details.
1147 * We want to be able to handle multiple superblock formats
1148 * so we have a common interface to them all, and an array of
1149 * different handlers.
1150 * We rely on user-space to write the initial superblock, and support
1151 * reading and updating of superblocks.
1152 * Interface methods are:
1153 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1154 * loads and validates a superblock on dev.
1155 * if refdev != NULL, compare superblocks on both devices
1157 * 0 - dev has a superblock that is compatible with refdev
1158 * 1 - dev has a superblock that is compatible and newer than refdev
1159 * so dev should be used as the refdev in future
1160 * -EINVAL superblock incompatible or invalid
1161 * -othererror e.g. -EIO
1163 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1164 * Verify that dev is acceptable into mddev.
1165 * The first time, mddev->raid_disks will be 0, and data from
1166 * dev should be merged in. Subsequent calls check that dev
1167 * is new enough. Return 0 or -EINVAL
1169 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1170 * Update the superblock for rdev with data in mddev
1171 * This does not write to disc.
1177 struct module *owner;
1178 int (*load_super)(struct md_rdev *rdev,
1179 struct md_rdev *refdev,
1181 int (*validate_super)(struct mddev *mddev,
1182 struct md_rdev *freshest,
1183 struct md_rdev *rdev);
1184 void (*sync_super)(struct mddev *mddev,
1185 struct md_rdev *rdev);
1186 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1187 sector_t num_sectors);
1188 int (*allow_new_offset)(struct md_rdev *rdev,
1189 unsigned long long new_offset);
1193 * Check that the given mddev has no bitmap.
1195 * This function is called from the run method of all personalities that do not
1196 * support bitmaps. It prints an error message and returns non-zero if mddev
1197 * has a bitmap. Otherwise, it returns 0.
1200 int md_check_no_bitmap(struct mddev *mddev)
1202 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1204 pr_warn("%s: bitmaps are not supported for %s\n",
1205 mdname(mddev), mddev->pers->name);
1208 EXPORT_SYMBOL(md_check_no_bitmap);
1211 * load_super for 0.90.0
1213 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1215 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1218 bool spare_disk = true;
1221 * Calculate the position of the superblock (512byte sectors),
1222 * it's at the end of the disk.
1224 * It also happens to be a multiple of 4Kb.
1226 rdev->sb_start = calc_dev_sboffset(rdev);
1228 ret = read_disk_sb(rdev, MD_SB_BYTES);
1234 bdevname(rdev->bdev, b);
1235 sb = page_address(rdev->sb_page);
1237 if (sb->md_magic != MD_SB_MAGIC) {
1238 pr_warn("md: invalid raid superblock magic on %s\n", b);
1242 if (sb->major_version != 0 ||
1243 sb->minor_version < 90 ||
1244 sb->minor_version > 91) {
1245 pr_warn("Bad version number %d.%d on %s\n",
1246 sb->major_version, sb->minor_version, b);
1250 if (sb->raid_disks <= 0)
1253 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1254 pr_warn("md: invalid superblock checksum on %s\n", b);
1258 rdev->preferred_minor = sb->md_minor;
1259 rdev->data_offset = 0;
1260 rdev->new_data_offset = 0;
1261 rdev->sb_size = MD_SB_BYTES;
1262 rdev->badblocks.shift = -1;
1264 if (sb->level == LEVEL_MULTIPATH)
1267 rdev->desc_nr = sb->this_disk.number;
1269 /* not spare disk, or LEVEL_MULTIPATH */
1270 if (sb->level == LEVEL_MULTIPATH ||
1271 (rdev->desc_nr >= 0 &&
1272 rdev->desc_nr < MD_SB_DISKS &&
1273 sb->disks[rdev->desc_nr].state &
1274 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1284 mdp_super_t *refsb = page_address(refdev->sb_page);
1285 if (!md_uuid_equal(refsb, sb)) {
1286 pr_warn("md: %s has different UUID to %s\n",
1287 b, bdevname(refdev->bdev,b2));
1290 if (!md_sb_equal(refsb, sb)) {
1291 pr_warn("md: %s has same UUID but different superblock to %s\n",
1292 b, bdevname(refdev->bdev, b2));
1296 ev2 = md_event(refsb);
1298 if (!spare_disk && ev1 > ev2)
1303 rdev->sectors = rdev->sb_start;
1304 /* Limit to 4TB as metadata cannot record more than that.
1305 * (not needed for Linear and RAID0 as metadata doesn't
1308 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1309 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1311 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1312 /* "this cannot possibly happen" ... */
1320 * validate_super for 0.90.0
1321 * note: we are not using "freshest" for 0.9 superblock
1323 static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1326 mdp_super_t *sb = page_address(rdev->sb_page);
1327 __u64 ev1 = md_event(sb);
1329 rdev->raid_disk = -1;
1330 clear_bit(Faulty, &rdev->flags);
1331 clear_bit(In_sync, &rdev->flags);
1332 clear_bit(Bitmap_sync, &rdev->flags);
1333 clear_bit(WriteMostly, &rdev->flags);
1335 if (mddev->raid_disks == 0) {
1336 mddev->major_version = 0;
1337 mddev->minor_version = sb->minor_version;
1338 mddev->patch_version = sb->patch_version;
1339 mddev->external = 0;
1340 mddev->chunk_sectors = sb->chunk_size >> 9;
1341 mddev->ctime = sb->ctime;
1342 mddev->utime = sb->utime;
1343 mddev->level = sb->level;
1344 mddev->clevel[0] = 0;
1345 mddev->layout = sb->layout;
1346 mddev->raid_disks = sb->raid_disks;
1347 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1348 mddev->events = ev1;
1349 mddev->bitmap_info.offset = 0;
1350 mddev->bitmap_info.space = 0;
1351 /* bitmap can use 60 K after the 4K superblocks */
1352 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1353 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1354 mddev->reshape_backwards = 0;
1356 if (mddev->minor_version >= 91) {
1357 mddev->reshape_position = sb->reshape_position;
1358 mddev->delta_disks = sb->delta_disks;
1359 mddev->new_level = sb->new_level;
1360 mddev->new_layout = sb->new_layout;
1361 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1362 if (mddev->delta_disks < 0)
1363 mddev->reshape_backwards = 1;
1365 mddev->reshape_position = MaxSector;
1366 mddev->delta_disks = 0;
1367 mddev->new_level = mddev->level;
1368 mddev->new_layout = mddev->layout;
1369 mddev->new_chunk_sectors = mddev->chunk_sectors;
1371 if (mddev->level == 0)
1374 if (sb->state & (1<<MD_SB_CLEAN))
1375 mddev->recovery_cp = MaxSector;
1377 if (sb->events_hi == sb->cp_events_hi &&
1378 sb->events_lo == sb->cp_events_lo) {
1379 mddev->recovery_cp = sb->recovery_cp;
1381 mddev->recovery_cp = 0;
1384 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1385 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1386 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1387 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1389 mddev->max_disks = MD_SB_DISKS;
1391 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1392 mddev->bitmap_info.file == NULL) {
1393 mddev->bitmap_info.offset =
1394 mddev->bitmap_info.default_offset;
1395 mddev->bitmap_info.space =
1396 mddev->bitmap_info.default_space;
1399 } else if (mddev->pers == NULL) {
1400 /* Insist on good event counter while assembling, except
1401 * for spares (which don't need an event count) */
1403 if (sb->disks[rdev->desc_nr].state & (
1404 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1405 if (ev1 < mddev->events)
1407 } else if (mddev->bitmap) {
1408 /* if adding to array with a bitmap, then we can accept an
1409 * older device ... but not too old.
1411 if (ev1 < mddev->bitmap->events_cleared)
1413 if (ev1 < mddev->events)
1414 set_bit(Bitmap_sync, &rdev->flags);
1416 if (ev1 < mddev->events)
1417 /* just a hot-add of a new device, leave raid_disk at -1 */
1421 if (mddev->level != LEVEL_MULTIPATH) {
1422 desc = sb->disks + rdev->desc_nr;
1424 if (desc->state & (1<<MD_DISK_FAULTY))
1425 set_bit(Faulty, &rdev->flags);
1426 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1427 desc->raid_disk < mddev->raid_disks */) {
1428 set_bit(In_sync, &rdev->flags);
1429 rdev->raid_disk = desc->raid_disk;
1430 rdev->saved_raid_disk = desc->raid_disk;
1431 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1432 /* active but not in sync implies recovery up to
1433 * reshape position. We don't know exactly where
1434 * that is, so set to zero for now */
1435 if (mddev->minor_version >= 91) {
1436 rdev->recovery_offset = 0;
1437 rdev->raid_disk = desc->raid_disk;
1440 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1441 set_bit(WriteMostly, &rdev->flags);
1442 if (desc->state & (1<<MD_DISK_FAILFAST))
1443 set_bit(FailFast, &rdev->flags);
1444 } else /* MULTIPATH are always insync */
1445 set_bit(In_sync, &rdev->flags);
1450 * sync_super for 0.90.0
1452 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1455 struct md_rdev *rdev2;
1456 int next_spare = mddev->raid_disks;
1458 /* make rdev->sb match mddev data..
1461 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1462 * 3/ any empty disks < next_spare become removed
1464 * disks[0] gets initialised to REMOVED because
1465 * we cannot be sure from other fields if it has
1466 * been initialised or not.
1469 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1471 rdev->sb_size = MD_SB_BYTES;
1473 sb = page_address(rdev->sb_page);
1475 memset(sb, 0, sizeof(*sb));
1477 sb->md_magic = MD_SB_MAGIC;
1478 sb->major_version = mddev->major_version;
1479 sb->patch_version = mddev->patch_version;
1480 sb->gvalid_words = 0; /* ignored */
1481 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1482 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1483 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1484 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1486 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1487 sb->level = mddev->level;
1488 sb->size = mddev->dev_sectors / 2;
1489 sb->raid_disks = mddev->raid_disks;
1490 sb->md_minor = mddev->md_minor;
1491 sb->not_persistent = 0;
1492 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1494 sb->events_hi = (mddev->events>>32);
1495 sb->events_lo = (u32)mddev->events;
1497 if (mddev->reshape_position == MaxSector)
1498 sb->minor_version = 90;
1500 sb->minor_version = 91;
1501 sb->reshape_position = mddev->reshape_position;
1502 sb->new_level = mddev->new_level;
1503 sb->delta_disks = mddev->delta_disks;
1504 sb->new_layout = mddev->new_layout;
1505 sb->new_chunk = mddev->new_chunk_sectors << 9;
1507 mddev->minor_version = sb->minor_version;
1510 sb->recovery_cp = mddev->recovery_cp;
1511 sb->cp_events_hi = (mddev->events>>32);
1512 sb->cp_events_lo = (u32)mddev->events;
1513 if (mddev->recovery_cp == MaxSector)
1514 sb->state = (1<< MD_SB_CLEAN);
1516 sb->recovery_cp = 0;
1518 sb->layout = mddev->layout;
1519 sb->chunk_size = mddev->chunk_sectors << 9;
1521 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1522 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1524 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1525 rdev_for_each(rdev2, mddev) {
1528 int is_active = test_bit(In_sync, &rdev2->flags);
1530 if (rdev2->raid_disk >= 0 &&
1531 sb->minor_version >= 91)
1532 /* we have nowhere to store the recovery_offset,
1533 * but if it is not below the reshape_position,
1534 * we can piggy-back on that.
1537 if (rdev2->raid_disk < 0 ||
1538 test_bit(Faulty, &rdev2->flags))
1541 desc_nr = rdev2->raid_disk;
1543 desc_nr = next_spare++;
1544 rdev2->desc_nr = desc_nr;
1545 d = &sb->disks[rdev2->desc_nr];
1547 d->number = rdev2->desc_nr;
1548 d->major = MAJOR(rdev2->bdev->bd_dev);
1549 d->minor = MINOR(rdev2->bdev->bd_dev);
1551 d->raid_disk = rdev2->raid_disk;
1553 d->raid_disk = rdev2->desc_nr; /* compatibility */
1554 if (test_bit(Faulty, &rdev2->flags))
1555 d->state = (1<<MD_DISK_FAULTY);
1556 else if (is_active) {
1557 d->state = (1<<MD_DISK_ACTIVE);
1558 if (test_bit(In_sync, &rdev2->flags))
1559 d->state |= (1<<MD_DISK_SYNC);
1567 if (test_bit(WriteMostly, &rdev2->flags))
1568 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1569 if (test_bit(FailFast, &rdev2->flags))
1570 d->state |= (1<<MD_DISK_FAILFAST);
1572 /* now set the "removed" and "faulty" bits on any missing devices */
1573 for (i=0 ; i < mddev->raid_disks ; i++) {
1574 mdp_disk_t *d = &sb->disks[i];
1575 if (d->state == 0 && d->number == 0) {
1578 d->state = (1<<MD_DISK_REMOVED);
1579 d->state |= (1<<MD_DISK_FAULTY);
1583 sb->nr_disks = nr_disks;
1584 sb->active_disks = active;
1585 sb->working_disks = working;
1586 sb->failed_disks = failed;
1587 sb->spare_disks = spare;
1589 sb->this_disk = sb->disks[rdev->desc_nr];
1590 sb->sb_csum = calc_sb_csum(sb);
1594 * rdev_size_change for 0.90.0
1596 static unsigned long long
1597 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1599 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1600 return 0; /* component must fit device */
1601 if (rdev->mddev->bitmap_info.offset)
1602 return 0; /* can't move bitmap */
1603 rdev->sb_start = calc_dev_sboffset(rdev);
1604 if (!num_sectors || num_sectors > rdev->sb_start)
1605 num_sectors = rdev->sb_start;
1606 /* Limit to 4TB as metadata cannot record more than that.
1607 * 4TB == 2^32 KB, or 2*2^32 sectors.
1609 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1610 num_sectors = (sector_t)(2ULL << 32) - 2;
1612 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1614 } while (md_super_wait(rdev->mddev) < 0);
1619 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1621 /* non-zero offset changes not possible with v0.90 */
1622 return new_offset == 0;
1626 * version 1 superblock
1629 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1633 unsigned long long newcsum;
1634 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1635 __le32 *isuper = (__le32*)sb;
1637 disk_csum = sb->sb_csum;
1640 for (; size >= 4; size -= 4)
1641 newcsum += le32_to_cpu(*isuper++);
1644 newcsum += le16_to_cpu(*(__le16*) isuper);
1646 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1647 sb->sb_csum = disk_csum;
1648 return cpu_to_le32(csum);
1651 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1653 struct mdp_superblock_1 *sb;
1657 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1659 bool spare_disk = true;
1662 * Calculate the position of the superblock in 512byte sectors.
1663 * It is always aligned to a 4K boundary and
1664 * depeding on minor_version, it can be:
1665 * 0: At least 8K, but less than 12K, from end of device
1666 * 1: At start of device
1667 * 2: 4K from start of device.
1669 switch(minor_version) {
1671 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1673 sb_start &= ~(sector_t)(4*2-1);
1684 rdev->sb_start = sb_start;
1686 /* superblock is rarely larger than 1K, but it can be larger,
1687 * and it is safe to read 4k, so we do that
1689 ret = read_disk_sb(rdev, 4096);
1690 if (ret) return ret;
1692 sb = page_address(rdev->sb_page);
1694 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1695 sb->major_version != cpu_to_le32(1) ||
1696 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1697 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1698 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1701 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1702 pr_warn("md: invalid superblock checksum on %s\n",
1703 bdevname(rdev->bdev,b));
1706 if (le64_to_cpu(sb->data_size) < 10) {
1707 pr_warn("md: data_size too small on %s\n",
1708 bdevname(rdev->bdev,b));
1713 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1714 /* Some padding is non-zero, might be a new feature */
1717 rdev->preferred_minor = 0xffff;
1718 rdev->data_offset = le64_to_cpu(sb->data_offset);
1719 rdev->new_data_offset = rdev->data_offset;
1720 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1721 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1722 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1723 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1725 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1726 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1727 if (rdev->sb_size & bmask)
1728 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1731 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1734 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1737 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1740 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1742 if (!rdev->bb_page) {
1743 rdev->bb_page = alloc_page(GFP_KERNEL);
1747 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1748 rdev->badblocks.count == 0) {
1749 /* need to load the bad block list.
1750 * Currently we limit it to one page.
1756 int sectors = le16_to_cpu(sb->bblog_size);
1757 if (sectors > (PAGE_SIZE / 512))
1759 offset = le32_to_cpu(sb->bblog_offset);
1762 bb_sector = (long long)offset;
1763 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1764 rdev->bb_page, REQ_OP_READ, 0, true))
1766 bbp = (__le64 *)page_address(rdev->bb_page);
1767 rdev->badblocks.shift = sb->bblog_shift;
1768 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1769 u64 bb = le64_to_cpu(*bbp);
1770 int count = bb & (0x3ff);
1771 u64 sector = bb >> 10;
1772 sector <<= sb->bblog_shift;
1773 count <<= sb->bblog_shift;
1776 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1779 } else if (sb->bblog_offset != 0)
1780 rdev->badblocks.shift = 0;
1782 if ((le32_to_cpu(sb->feature_map) &
1783 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1784 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1785 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1786 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1789 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1793 /* not spare disk, or LEVEL_MULTIPATH */
1794 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1795 (rdev->desc_nr >= 0 &&
1796 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1797 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1798 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1808 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1810 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1811 sb->level != refsb->level ||
1812 sb->layout != refsb->layout ||
1813 sb->chunksize != refsb->chunksize) {
1814 pr_warn("md: %s has strangely different superblock to %s\n",
1815 bdevname(rdev->bdev,b),
1816 bdevname(refdev->bdev,b2));
1819 ev1 = le64_to_cpu(sb->events);
1820 ev2 = le64_to_cpu(refsb->events);
1822 if (!spare_disk && ev1 > ev2)
1827 if (minor_version) {
1828 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1829 sectors -= rdev->data_offset;
1831 sectors = rdev->sb_start;
1832 if (sectors < le64_to_cpu(sb->data_size))
1834 rdev->sectors = le64_to_cpu(sb->data_size);
1838 static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1840 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1841 __u64 ev1 = le64_to_cpu(sb->events);
1843 rdev->raid_disk = -1;
1844 clear_bit(Faulty, &rdev->flags);
1845 clear_bit(In_sync, &rdev->flags);
1846 clear_bit(Bitmap_sync, &rdev->flags);
1847 clear_bit(WriteMostly, &rdev->flags);
1849 if (mddev->raid_disks == 0) {
1850 mddev->major_version = 1;
1851 mddev->patch_version = 0;
1852 mddev->external = 0;
1853 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1854 mddev->ctime = le64_to_cpu(sb->ctime);
1855 mddev->utime = le64_to_cpu(sb->utime);
1856 mddev->level = le32_to_cpu(sb->level);
1857 mddev->clevel[0] = 0;
1858 mddev->layout = le32_to_cpu(sb->layout);
1859 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1860 mddev->dev_sectors = le64_to_cpu(sb->size);
1861 mddev->events = ev1;
1862 mddev->bitmap_info.offset = 0;
1863 mddev->bitmap_info.space = 0;
1864 /* Default location for bitmap is 1K after superblock
1865 * using 3K - total of 4K
1867 mddev->bitmap_info.default_offset = 1024 >> 9;
1868 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1869 mddev->reshape_backwards = 0;
1871 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1872 memcpy(mddev->uuid, sb->set_uuid, 16);
1874 mddev->max_disks = (4096-256)/2;
1876 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1877 mddev->bitmap_info.file == NULL) {
1878 mddev->bitmap_info.offset =
1879 (__s32)le32_to_cpu(sb->bitmap_offset);
1880 /* Metadata doesn't record how much space is available.
1881 * For 1.0, we assume we can use up to the superblock
1882 * if before, else to 4K beyond superblock.
1883 * For others, assume no change is possible.
1885 if (mddev->minor_version > 0)
1886 mddev->bitmap_info.space = 0;
1887 else if (mddev->bitmap_info.offset > 0)
1888 mddev->bitmap_info.space =
1889 8 - mddev->bitmap_info.offset;
1891 mddev->bitmap_info.space =
1892 -mddev->bitmap_info.offset;
1895 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1896 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1897 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1898 mddev->new_level = le32_to_cpu(sb->new_level);
1899 mddev->new_layout = le32_to_cpu(sb->new_layout);
1900 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1901 if (mddev->delta_disks < 0 ||
1902 (mddev->delta_disks == 0 &&
1903 (le32_to_cpu(sb->feature_map)
1904 & MD_FEATURE_RESHAPE_BACKWARDS)))
1905 mddev->reshape_backwards = 1;
1907 mddev->reshape_position = MaxSector;
1908 mddev->delta_disks = 0;
1909 mddev->new_level = mddev->level;
1910 mddev->new_layout = mddev->layout;
1911 mddev->new_chunk_sectors = mddev->chunk_sectors;
1914 if (mddev->level == 0 &&
1915 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1918 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1919 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1921 if (le32_to_cpu(sb->feature_map) &
1922 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1923 if (le32_to_cpu(sb->feature_map) &
1924 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1926 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1927 (le32_to_cpu(sb->feature_map) &
1928 MD_FEATURE_MULTIPLE_PPLS))
1930 set_bit(MD_HAS_PPL, &mddev->flags);
1932 } else if (mddev->pers == NULL) {
1933 /* Insist of good event counter while assembling, except for
1934 * spares (which don't need an event count).
1935 * Similar to mdadm, we allow event counter difference of 1
1936 * from the freshest device.
1938 if (rdev->desc_nr >= 0 &&
1939 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1940 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1941 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1942 if (ev1 + 1 < mddev->events)
1944 } else if (mddev->bitmap) {
1945 /* If adding to array with a bitmap, then we can accept an
1946 * older device, but not too old.
1948 if (ev1 < mddev->bitmap->events_cleared)
1950 if (ev1 < mddev->events)
1951 set_bit(Bitmap_sync, &rdev->flags);
1953 if (ev1 < mddev->events)
1954 /* just a hot-add of a new device, leave raid_disk at -1 */
1957 if (mddev->level != LEVEL_MULTIPATH) {
1959 if (rdev->desc_nr < 0 ||
1960 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1961 role = MD_DISK_ROLE_SPARE;
1963 } else if (mddev->pers == NULL && freshest && ev1 < mddev->events) {
1965 * If we are assembling, and our event counter is smaller than the
1966 * highest event counter, we cannot trust our superblock about the role.
1967 * It could happen that our rdev was marked as Faulty, and all other
1968 * superblocks were updated with +1 event counter.
1969 * Then, before the next superblock update, which typically happens when
1970 * remove_and_add_spares() removes the device from the array, there was
1971 * a crash or reboot.
1972 * If we allow current rdev without consulting the freshest superblock,
1973 * we could cause data corruption.
1974 * Note that in this case our event counter is smaller by 1 than the
1975 * highest, otherwise, this rdev would not be allowed into array;
1976 * both kernel and mdadm allow event counter difference of 1.
1978 struct mdp_superblock_1 *freshest_sb = page_address(freshest->sb_page);
1979 u32 freshest_max_dev = le32_to_cpu(freshest_sb->max_dev);
1981 if (rdev->desc_nr >= freshest_max_dev) {
1982 /* this is unexpected, better not proceed */
1983 pr_warn("md: %s: rdev[%pg]: desc_nr(%d) >= freshest(%pg)->sb->max_dev(%u)\n",
1984 mdname(mddev), rdev->bdev, rdev->desc_nr,
1985 freshest->bdev, freshest_max_dev);
1989 role = le16_to_cpu(freshest_sb->dev_roles[rdev->desc_nr]);
1990 pr_debug("md: %s: rdev[%pg]: role=%d(0x%x) according to freshest %pg\n",
1991 mdname(mddev), rdev->bdev, role, role, freshest->bdev);
1993 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1996 case MD_DISK_ROLE_SPARE: /* spare */
1998 case MD_DISK_ROLE_FAULTY: /* faulty */
1999 set_bit(Faulty, &rdev->flags);
2001 case MD_DISK_ROLE_JOURNAL: /* journal device */
2002 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
2003 /* journal device without journal feature */
2004 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
2007 set_bit(Journal, &rdev->flags);
2008 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
2009 rdev->raid_disk = 0;
2012 rdev->saved_raid_disk = role;
2013 if ((le32_to_cpu(sb->feature_map) &
2014 MD_FEATURE_RECOVERY_OFFSET)) {
2015 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
2016 if (!(le32_to_cpu(sb->feature_map) &
2017 MD_FEATURE_RECOVERY_BITMAP))
2018 rdev->saved_raid_disk = -1;
2021 * If the array is FROZEN, then the device can't
2022 * be in_sync with rest of array.
2024 if (!test_bit(MD_RECOVERY_FROZEN,
2026 set_bit(In_sync, &rdev->flags);
2028 rdev->raid_disk = role;
2031 if (sb->devflags & WriteMostly1)
2032 set_bit(WriteMostly, &rdev->flags);
2033 if (sb->devflags & FailFast1)
2034 set_bit(FailFast, &rdev->flags);
2035 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
2036 set_bit(Replacement, &rdev->flags);
2037 } else /* MULTIPATH are always insync */
2038 set_bit(In_sync, &rdev->flags);
2043 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
2045 struct mdp_superblock_1 *sb;
2046 struct md_rdev *rdev2;
2048 /* make rdev->sb match mddev and rdev data. */
2050 sb = page_address(rdev->sb_page);
2052 sb->feature_map = 0;
2054 sb->recovery_offset = cpu_to_le64(0);
2055 memset(sb->pad3, 0, sizeof(sb->pad3));
2057 sb->utime = cpu_to_le64((__u64)mddev->utime);
2058 sb->events = cpu_to_le64(mddev->events);
2060 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
2061 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
2062 sb->resync_offset = cpu_to_le64(MaxSector);
2064 sb->resync_offset = cpu_to_le64(0);
2066 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2068 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2069 sb->size = cpu_to_le64(mddev->dev_sectors);
2070 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2071 sb->level = cpu_to_le32(mddev->level);
2072 sb->layout = cpu_to_le32(mddev->layout);
2073 if (test_bit(FailFast, &rdev->flags))
2074 sb->devflags |= FailFast1;
2076 sb->devflags &= ~FailFast1;
2078 if (test_bit(WriteMostly, &rdev->flags))
2079 sb->devflags |= WriteMostly1;
2081 sb->devflags &= ~WriteMostly1;
2082 sb->data_offset = cpu_to_le64(rdev->data_offset);
2083 sb->data_size = cpu_to_le64(rdev->sectors);
2085 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2086 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2087 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2090 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2091 !test_bit(In_sync, &rdev->flags)) {
2093 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2094 sb->recovery_offset =
2095 cpu_to_le64(rdev->recovery_offset);
2096 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2098 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2100 /* Note: recovery_offset and journal_tail share space */
2101 if (test_bit(Journal, &rdev->flags))
2102 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2103 if (test_bit(Replacement, &rdev->flags))
2105 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2107 if (mddev->reshape_position != MaxSector) {
2108 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2109 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2110 sb->new_layout = cpu_to_le32(mddev->new_layout);
2111 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2112 sb->new_level = cpu_to_le32(mddev->new_level);
2113 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2114 if (mddev->delta_disks == 0 &&
2115 mddev->reshape_backwards)
2117 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2118 if (rdev->new_data_offset != rdev->data_offset) {
2120 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2121 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2122 - rdev->data_offset));
2126 if (mddev_is_clustered(mddev))
2127 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2129 if (rdev->badblocks.count == 0)
2130 /* Nothing to do for bad blocks*/ ;
2131 else if (sb->bblog_offset == 0)
2132 /* Cannot record bad blocks on this device */
2133 md_error(mddev, rdev);
2135 struct badblocks *bb = &rdev->badblocks;
2136 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2138 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2143 seq = read_seqbegin(&bb->lock);
2145 memset(bbp, 0xff, PAGE_SIZE);
2147 for (i = 0 ; i < bb->count ; i++) {
2148 u64 internal_bb = p[i];
2149 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2150 | BB_LEN(internal_bb));
2151 bbp[i] = cpu_to_le64(store_bb);
2154 if (read_seqretry(&bb->lock, seq))
2157 bb->sector = (rdev->sb_start +
2158 (int)le32_to_cpu(sb->bblog_offset));
2159 bb->size = le16_to_cpu(sb->bblog_size);
2164 rdev_for_each(rdev2, mddev)
2165 if (rdev2->desc_nr+1 > max_dev)
2166 max_dev = rdev2->desc_nr+1;
2168 if (max_dev > le32_to_cpu(sb->max_dev)) {
2170 sb->max_dev = cpu_to_le32(max_dev);
2171 rdev->sb_size = max_dev * 2 + 256;
2172 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2173 if (rdev->sb_size & bmask)
2174 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2176 max_dev = le32_to_cpu(sb->max_dev);
2178 for (i=0; i<max_dev;i++)
2179 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2181 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2182 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2184 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2185 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2187 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2189 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2190 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2191 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2194 rdev_for_each(rdev2, mddev) {
2196 if (test_bit(Faulty, &rdev2->flags))
2197 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2198 else if (test_bit(In_sync, &rdev2->flags))
2199 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2200 else if (test_bit(Journal, &rdev2->flags))
2201 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2202 else if (rdev2->raid_disk >= 0)
2203 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2205 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2208 sb->sb_csum = calc_sb_1_csum(sb);
2211 static sector_t super_1_choose_bm_space(sector_t dev_size)
2215 /* if the device is bigger than 8Gig, save 64k for bitmap
2216 * usage, if bigger than 200Gig, save 128k
2218 if (dev_size < 64*2)
2220 else if (dev_size - 64*2 >= 200*1024*1024*2)
2222 else if (dev_size - 4*2 > 8*1024*1024*2)
2229 static unsigned long long
2230 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2232 struct mdp_superblock_1 *sb;
2233 sector_t max_sectors;
2234 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2235 return 0; /* component must fit device */
2236 if (rdev->data_offset != rdev->new_data_offset)
2237 return 0; /* too confusing */
2238 if (rdev->sb_start < rdev->data_offset) {
2239 /* minor versions 1 and 2; superblock before data */
2240 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2241 max_sectors -= rdev->data_offset;
2242 if (!num_sectors || num_sectors > max_sectors)
2243 num_sectors = max_sectors;
2244 } else if (rdev->mddev->bitmap_info.offset) {
2245 /* minor version 0 with bitmap we can't move */
2248 /* minor version 0; superblock after data */
2249 sector_t sb_start, bm_space;
2250 sector_t dev_size = i_size_read(rdev->bdev->bd_inode) >> 9;
2252 /* 8K is for superblock */
2253 sb_start = dev_size - 8*2;
2254 sb_start &= ~(sector_t)(4*2 - 1);
2256 bm_space = super_1_choose_bm_space(dev_size);
2258 /* Space that can be used to store date needs to decrease
2259 * superblock bitmap space and bad block space(4K)
2261 max_sectors = sb_start - bm_space - 4*2;
2263 if (!num_sectors || num_sectors > max_sectors)
2264 num_sectors = max_sectors;
2265 rdev->sb_start = sb_start;
2267 sb = page_address(rdev->sb_page);
2268 sb->data_size = cpu_to_le64(num_sectors);
2269 sb->super_offset = cpu_to_le64(rdev->sb_start);
2270 sb->sb_csum = calc_sb_1_csum(sb);
2272 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2274 } while (md_super_wait(rdev->mddev) < 0);
2280 super_1_allow_new_offset(struct md_rdev *rdev,
2281 unsigned long long new_offset)
2283 /* All necessary checks on new >= old have been done */
2284 struct bitmap *bitmap;
2285 if (new_offset >= rdev->data_offset)
2288 /* with 1.0 metadata, there is no metadata to tread on
2289 * so we can always move back */
2290 if (rdev->mddev->minor_version == 0)
2293 /* otherwise we must be sure not to step on
2294 * any metadata, so stay:
2295 * 36K beyond start of superblock
2296 * beyond end of badblocks
2297 * beyond write-intent bitmap
2299 if (rdev->sb_start + (32+4)*2 > new_offset)
2301 bitmap = rdev->mddev->bitmap;
2302 if (bitmap && !rdev->mddev->bitmap_info.file &&
2303 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2304 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2306 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2312 static struct super_type super_types[] = {
2315 .owner = THIS_MODULE,
2316 .load_super = super_90_load,
2317 .validate_super = super_90_validate,
2318 .sync_super = super_90_sync,
2319 .rdev_size_change = super_90_rdev_size_change,
2320 .allow_new_offset = super_90_allow_new_offset,
2324 .owner = THIS_MODULE,
2325 .load_super = super_1_load,
2326 .validate_super = super_1_validate,
2327 .sync_super = super_1_sync,
2328 .rdev_size_change = super_1_rdev_size_change,
2329 .allow_new_offset = super_1_allow_new_offset,
2333 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2335 if (mddev->sync_super) {
2336 mddev->sync_super(mddev, rdev);
2340 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2342 super_types[mddev->major_version].sync_super(mddev, rdev);
2345 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2347 struct md_rdev *rdev, *rdev2;
2350 rdev_for_each_rcu(rdev, mddev1) {
2351 if (test_bit(Faulty, &rdev->flags) ||
2352 test_bit(Journal, &rdev->flags) ||
2353 rdev->raid_disk == -1)
2355 rdev_for_each_rcu(rdev2, mddev2) {
2356 if (test_bit(Faulty, &rdev2->flags) ||
2357 test_bit(Journal, &rdev2->flags) ||
2358 rdev2->raid_disk == -1)
2360 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2370 static LIST_HEAD(pending_raid_disks);
2373 * Try to register data integrity profile for an mddev
2375 * This is called when an array is started and after a disk has been kicked
2376 * from the array. It only succeeds if all working and active component devices
2377 * are integrity capable with matching profiles.
2379 int md_integrity_register(struct mddev *mddev)
2381 struct md_rdev *rdev, *reference = NULL;
2383 if (list_empty(&mddev->disks))
2384 return 0; /* nothing to do */
2385 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2386 return 0; /* shouldn't register, or already is */
2387 rdev_for_each(rdev, mddev) {
2388 /* skip spares and non-functional disks */
2389 if (test_bit(Faulty, &rdev->flags))
2391 if (rdev->raid_disk < 0)
2394 /* Use the first rdev as the reference */
2398 /* does this rdev's profile match the reference profile? */
2399 if (blk_integrity_compare(reference->bdev->bd_disk,
2400 rdev->bdev->bd_disk) < 0)
2403 if (!reference || !bdev_get_integrity(reference->bdev))
2406 * All component devices are integrity capable and have matching
2407 * profiles, register the common profile for the md device.
2409 blk_integrity_register(mddev->gendisk,
2410 bdev_get_integrity(reference->bdev));
2412 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2413 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2414 pr_err("md: failed to create integrity pool for %s\n",
2420 EXPORT_SYMBOL(md_integrity_register);
2423 * Attempt to add an rdev, but only if it is consistent with the current
2426 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2428 struct blk_integrity *bi_mddev;
2429 char name[BDEVNAME_SIZE];
2431 if (!mddev->gendisk)
2434 bi_mddev = blk_get_integrity(mddev->gendisk);
2436 if (!bi_mddev) /* nothing to do */
2439 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2440 pr_err("%s: incompatible integrity profile for %s\n",
2441 mdname(mddev), bdevname(rdev->bdev, name));
2447 EXPORT_SYMBOL(md_integrity_add_rdev);
2449 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2451 char b[BDEVNAME_SIZE];
2455 /* prevent duplicates */
2456 if (find_rdev(mddev, rdev->bdev->bd_dev))
2459 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2463 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2464 if (!test_bit(Journal, &rdev->flags) &&
2466 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2468 /* Cannot change size, so fail
2469 * If mddev->level <= 0, then we don't care
2470 * about aligning sizes (e.g. linear)
2472 if (mddev->level > 0)
2475 mddev->dev_sectors = rdev->sectors;
2478 /* Verify rdev->desc_nr is unique.
2479 * If it is -1, assign a free number, else
2480 * check number is not in use
2483 if (rdev->desc_nr < 0) {
2486 choice = mddev->raid_disks;
2487 while (md_find_rdev_nr_rcu(mddev, choice))
2489 rdev->desc_nr = choice;
2491 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2497 if (!test_bit(Journal, &rdev->flags) &&
2498 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2499 pr_warn("md: %s: array is limited to %d devices\n",
2500 mdname(mddev), mddev->max_disks);
2503 bdevname(rdev->bdev,b);
2504 strreplace(b, '/', '!');
2506 rdev->mddev = mddev;
2507 pr_debug("md: bind<%s>\n", b);
2509 if (mddev->raid_disks)
2510 mddev_create_serial_pool(mddev, rdev, false);
2512 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2515 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2516 /* failure here is OK */
2517 err = sysfs_create_link(&rdev->kobj, ko, "block");
2518 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2519 rdev->sysfs_unack_badblocks =
2520 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2521 rdev->sysfs_badblocks =
2522 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2524 list_add_rcu(&rdev->same_set, &mddev->disks);
2525 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2527 /* May as well allow recovery to be retried once */
2528 mddev->recovery_disabled++;
2533 pr_warn("md: failed to register dev-%s for %s\n",
2535 mddev_destroy_serial_pool(mddev, rdev, false);
2539 static void rdev_delayed_delete(struct work_struct *ws)
2541 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2542 kobject_del(&rdev->kobj);
2543 kobject_put(&rdev->kobj);
2546 static void unbind_rdev_from_array(struct md_rdev *rdev)
2548 char b[BDEVNAME_SIZE];
2550 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2551 list_del_rcu(&rdev->same_set);
2552 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2553 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2555 sysfs_remove_link(&rdev->kobj, "block");
2556 sysfs_put(rdev->sysfs_state);
2557 sysfs_put(rdev->sysfs_unack_badblocks);
2558 sysfs_put(rdev->sysfs_badblocks);
2559 rdev->sysfs_state = NULL;
2560 rdev->sysfs_unack_badblocks = NULL;
2561 rdev->sysfs_badblocks = NULL;
2562 rdev->badblocks.count = 0;
2563 /* We need to delay this, otherwise we can deadlock when
2564 * writing to 'remove' to "dev/state". We also need
2565 * to delay it due to rcu usage.
2568 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2569 kobject_get(&rdev->kobj);
2570 queue_work(md_rdev_misc_wq, &rdev->del_work);
2574 * prevent the device from being mounted, repartitioned or
2575 * otherwise reused by a RAID array (or any other kernel
2576 * subsystem), by bd_claiming the device.
2578 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2581 struct block_device *bdev;
2583 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2584 shared ? (struct md_rdev *)lock_rdev : rdev);
2586 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2587 MAJOR(dev), MINOR(dev));
2588 return PTR_ERR(bdev);
2594 static void unlock_rdev(struct md_rdev *rdev)
2596 struct block_device *bdev = rdev->bdev;
2598 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2601 void md_autodetect_dev(dev_t dev);
2603 static void export_rdev(struct md_rdev *rdev)
2605 char b[BDEVNAME_SIZE];
2607 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2608 md_rdev_clear(rdev);
2610 if (test_bit(AutoDetected, &rdev->flags))
2611 md_autodetect_dev(rdev->bdev->bd_dev);
2614 kobject_put(&rdev->kobj);
2617 void md_kick_rdev_from_array(struct md_rdev *rdev)
2619 unbind_rdev_from_array(rdev);
2622 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2624 static void export_array(struct mddev *mddev)
2626 struct md_rdev *rdev;
2628 while (!list_empty(&mddev->disks)) {
2629 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2631 md_kick_rdev_from_array(rdev);
2633 mddev->raid_disks = 0;
2634 mddev->major_version = 0;
2637 static bool set_in_sync(struct mddev *mddev)
2639 lockdep_assert_held(&mddev->lock);
2640 if (!mddev->in_sync) {
2641 mddev->sync_checkers++;
2642 spin_unlock(&mddev->lock);
2643 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2644 spin_lock(&mddev->lock);
2645 if (!mddev->in_sync &&
2646 percpu_ref_is_zero(&mddev->writes_pending)) {
2649 * Ensure ->in_sync is visible before we clear
2653 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2654 sysfs_notify_dirent_safe(mddev->sysfs_state);
2656 if (--mddev->sync_checkers == 0)
2657 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2659 if (mddev->safemode == 1)
2660 mddev->safemode = 0;
2661 return mddev->in_sync;
2664 static void sync_sbs(struct mddev *mddev, int nospares)
2666 /* Update each superblock (in-memory image), but
2667 * if we are allowed to, skip spares which already
2668 * have the right event counter, or have one earlier
2669 * (which would mean they aren't being marked as dirty
2670 * with the rest of the array)
2672 struct md_rdev *rdev;
2673 rdev_for_each(rdev, mddev) {
2674 if (rdev->sb_events == mddev->events ||
2676 rdev->raid_disk < 0 &&
2677 rdev->sb_events+1 == mddev->events)) {
2678 /* Don't update this superblock */
2679 rdev->sb_loaded = 2;
2681 sync_super(mddev, rdev);
2682 rdev->sb_loaded = 1;
2687 static bool does_sb_need_changing(struct mddev *mddev)
2689 struct md_rdev *rdev = NULL, *iter;
2690 struct mdp_superblock_1 *sb;
2693 /* Find a good rdev */
2694 rdev_for_each(iter, mddev)
2695 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2700 /* No good device found. */
2704 sb = page_address(rdev->sb_page);
2705 /* Check if a device has become faulty or a spare become active */
2706 rdev_for_each(rdev, mddev) {
2707 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2708 /* Device activated? */
2709 if (role == 0xffff && rdev->raid_disk >=0 &&
2710 !test_bit(Faulty, &rdev->flags))
2712 /* Device turned faulty? */
2713 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2717 /* Check if any mddev parameters have changed */
2718 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2719 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2720 (mddev->layout != le32_to_cpu(sb->layout)) ||
2721 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2722 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2728 void md_update_sb(struct mddev *mddev, int force_change)
2730 struct md_rdev *rdev;
2733 int any_badblocks_changed = 0;
2738 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2743 if (mddev_is_clustered(mddev)) {
2744 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2746 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2748 ret = md_cluster_ops->metadata_update_start(mddev);
2749 /* Has someone else has updated the sb */
2750 if (!does_sb_need_changing(mddev)) {
2752 md_cluster_ops->metadata_update_cancel(mddev);
2753 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2754 BIT(MD_SB_CHANGE_DEVS) |
2755 BIT(MD_SB_CHANGE_CLEAN));
2761 * First make sure individual recovery_offsets are correct
2762 * curr_resync_completed can only be used during recovery.
2763 * During reshape/resync it might use array-addresses rather
2764 * that device addresses.
2766 rdev_for_each(rdev, mddev) {
2767 if (rdev->raid_disk >= 0 &&
2768 mddev->delta_disks >= 0 &&
2769 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2770 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2771 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2772 !test_bit(Journal, &rdev->flags) &&
2773 !test_bit(In_sync, &rdev->flags) &&
2774 mddev->curr_resync_completed > rdev->recovery_offset)
2775 rdev->recovery_offset = mddev->curr_resync_completed;
2778 if (!mddev->persistent) {
2779 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2780 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2781 if (!mddev->external) {
2782 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2783 rdev_for_each(rdev, mddev) {
2784 if (rdev->badblocks.changed) {
2785 rdev->badblocks.changed = 0;
2786 ack_all_badblocks(&rdev->badblocks);
2787 md_error(mddev, rdev);
2789 clear_bit(Blocked, &rdev->flags);
2790 clear_bit(BlockedBadBlocks, &rdev->flags);
2791 wake_up(&rdev->blocked_wait);
2794 wake_up(&mddev->sb_wait);
2798 spin_lock(&mddev->lock);
2800 mddev->utime = ktime_get_real_seconds();
2802 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2804 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2805 /* just a clean<-> dirty transition, possibly leave spares alone,
2806 * though if events isn't the right even/odd, we will have to do
2812 if (mddev->degraded)
2813 /* If the array is degraded, then skipping spares is both
2814 * dangerous and fairly pointless.
2815 * Dangerous because a device that was removed from the array
2816 * might have a event_count that still looks up-to-date,
2817 * so it can be re-added without a resync.
2818 * Pointless because if there are any spares to skip,
2819 * then a recovery will happen and soon that array won't
2820 * be degraded any more and the spare can go back to sleep then.
2824 sync_req = mddev->in_sync;
2826 /* If this is just a dirty<->clean transition, and the array is clean
2827 * and 'events' is odd, we can roll back to the previous clean state */
2829 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2830 && mddev->can_decrease_events
2831 && mddev->events != 1) {
2833 mddev->can_decrease_events = 0;
2835 /* otherwise we have to go forward and ... */
2837 mddev->can_decrease_events = nospares;
2841 * This 64-bit counter should never wrap.
2842 * Either we are in around ~1 trillion A.C., assuming
2843 * 1 reboot per second, or we have a bug...
2845 WARN_ON(mddev->events == 0);
2847 rdev_for_each(rdev, mddev) {
2848 if (rdev->badblocks.changed)
2849 any_badblocks_changed++;
2850 if (test_bit(Faulty, &rdev->flags))
2851 set_bit(FaultRecorded, &rdev->flags);
2854 sync_sbs(mddev, nospares);
2855 spin_unlock(&mddev->lock);
2857 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2858 mdname(mddev), mddev->in_sync);
2861 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2863 md_bitmap_update_sb(mddev->bitmap);
2864 rdev_for_each(rdev, mddev) {
2865 char b[BDEVNAME_SIZE];
2867 if (rdev->sb_loaded != 1)
2868 continue; /* no noise on spare devices */
2870 if (!test_bit(Faulty, &rdev->flags)) {
2871 md_super_write(mddev,rdev,
2872 rdev->sb_start, rdev->sb_size,
2874 pr_debug("md: (write) %s's sb offset: %llu\n",
2875 bdevname(rdev->bdev, b),
2876 (unsigned long long)rdev->sb_start);
2877 rdev->sb_events = mddev->events;
2878 if (rdev->badblocks.size) {
2879 md_super_write(mddev, rdev,
2880 rdev->badblocks.sector,
2881 rdev->badblocks.size << 9,
2883 rdev->badblocks.size = 0;
2887 pr_debug("md: %s (skipping faulty)\n",
2888 bdevname(rdev->bdev, b));
2890 if (mddev->level == LEVEL_MULTIPATH)
2891 /* only need to write one superblock... */
2894 if (md_super_wait(mddev) < 0)
2896 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2898 if (mddev_is_clustered(mddev) && ret == 0)
2899 md_cluster_ops->metadata_update_finish(mddev);
2901 if (mddev->in_sync != sync_req ||
2902 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2903 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2904 /* have to write it out again */
2906 wake_up(&mddev->sb_wait);
2907 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2908 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2910 rdev_for_each(rdev, mddev) {
2911 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2912 clear_bit(Blocked, &rdev->flags);
2914 if (any_badblocks_changed)
2915 ack_all_badblocks(&rdev->badblocks);
2916 clear_bit(BlockedBadBlocks, &rdev->flags);
2917 wake_up(&rdev->blocked_wait);
2920 EXPORT_SYMBOL(md_update_sb);
2922 static int add_bound_rdev(struct md_rdev *rdev)
2924 struct mddev *mddev = rdev->mddev;
2926 bool add_journal = test_bit(Journal, &rdev->flags);
2928 if (!mddev->pers->hot_remove_disk || add_journal) {
2929 /* If there is hot_add_disk but no hot_remove_disk
2930 * then added disks for geometry changes,
2931 * and should be added immediately.
2933 super_types[mddev->major_version].
2934 validate_super(mddev, NULL/*freshest*/, rdev);
2936 mddev_suspend(mddev);
2937 err = mddev->pers->hot_add_disk(mddev, rdev);
2939 mddev_resume(mddev);
2941 md_kick_rdev_from_array(rdev);
2945 sysfs_notify_dirent_safe(rdev->sysfs_state);
2947 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2948 if (mddev->degraded)
2949 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2950 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2951 md_new_event(mddev);
2952 md_wakeup_thread(mddev->thread);
2956 /* words written to sysfs files may, or may not, be \n terminated.
2957 * We want to accept with case. For this we use cmd_match.
2959 static int cmd_match(const char *cmd, const char *str)
2961 /* See if cmd, written into a sysfs file, matches
2962 * str. They must either be the same, or cmd can
2963 * have a trailing newline
2965 while (*cmd && *str && *cmd == *str) {
2976 struct rdev_sysfs_entry {
2977 struct attribute attr;
2978 ssize_t (*show)(struct md_rdev *, char *);
2979 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2983 state_show(struct md_rdev *rdev, char *page)
2987 unsigned long flags = READ_ONCE(rdev->flags);
2989 if (test_bit(Faulty, &flags) ||
2990 (!test_bit(ExternalBbl, &flags) &&
2991 rdev->badblocks.unacked_exist))
2992 len += sprintf(page+len, "faulty%s", sep);
2993 if (test_bit(In_sync, &flags))
2994 len += sprintf(page+len, "in_sync%s", sep);
2995 if (test_bit(Journal, &flags))
2996 len += sprintf(page+len, "journal%s", sep);
2997 if (test_bit(WriteMostly, &flags))
2998 len += sprintf(page+len, "write_mostly%s", sep);
2999 if (test_bit(Blocked, &flags) ||
3000 (rdev->badblocks.unacked_exist
3001 && !test_bit(Faulty, &flags)))
3002 len += sprintf(page+len, "blocked%s", sep);
3003 if (!test_bit(Faulty, &flags) &&
3004 !test_bit(Journal, &flags) &&
3005 !test_bit(In_sync, &flags))
3006 len += sprintf(page+len, "spare%s", sep);
3007 if (test_bit(WriteErrorSeen, &flags))
3008 len += sprintf(page+len, "write_error%s", sep);
3009 if (test_bit(WantReplacement, &flags))
3010 len += sprintf(page+len, "want_replacement%s", sep);
3011 if (test_bit(Replacement, &flags))
3012 len += sprintf(page+len, "replacement%s", sep);
3013 if (test_bit(ExternalBbl, &flags))
3014 len += sprintf(page+len, "external_bbl%s", sep);
3015 if (test_bit(FailFast, &flags))
3016 len += sprintf(page+len, "failfast%s", sep);
3021 return len+sprintf(page+len, "\n");
3025 state_store(struct md_rdev *rdev, const char *buf, size_t len)
3028 * faulty - simulates an error
3029 * remove - disconnects the device
3030 * writemostly - sets write_mostly
3031 * -writemostly - clears write_mostly
3032 * blocked - sets the Blocked flags
3033 * -blocked - clears the Blocked and possibly simulates an error
3034 * insync - sets Insync providing device isn't active
3035 * -insync - clear Insync for a device with a slot assigned,
3036 * so that it gets rebuilt based on bitmap
3037 * write_error - sets WriteErrorSeen
3038 * -write_error - clears WriteErrorSeen
3039 * {,-}failfast - set/clear FailFast
3042 struct mddev *mddev = rdev->mddev;
3044 bool need_update_sb = false;
3046 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
3047 md_error(rdev->mddev, rdev);
3048 if (test_bit(Faulty, &rdev->flags))
3052 } else if (cmd_match(buf, "remove")) {
3053 if (rdev->mddev->pers) {
3054 clear_bit(Blocked, &rdev->flags);
3055 remove_and_add_spares(rdev->mddev, rdev);
3057 if (rdev->raid_disk >= 0)
3061 if (mddev_is_clustered(mddev))
3062 err = md_cluster_ops->remove_disk(mddev, rdev);
3065 md_kick_rdev_from_array(rdev);
3067 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3068 md_wakeup_thread(mddev->thread);
3070 md_new_event(mddev);
3073 } else if (cmd_match(buf, "writemostly")) {
3074 set_bit(WriteMostly, &rdev->flags);
3075 mddev_create_serial_pool(rdev->mddev, rdev, false);
3076 need_update_sb = true;
3078 } else if (cmd_match(buf, "-writemostly")) {
3079 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3080 clear_bit(WriteMostly, &rdev->flags);
3081 need_update_sb = true;
3083 } else if (cmd_match(buf, "blocked")) {
3084 set_bit(Blocked, &rdev->flags);
3086 } else if (cmd_match(buf, "-blocked")) {
3087 if (!test_bit(Faulty, &rdev->flags) &&
3088 !test_bit(ExternalBbl, &rdev->flags) &&
3089 rdev->badblocks.unacked_exist) {
3090 /* metadata handler doesn't understand badblocks,
3091 * so we need to fail the device
3093 md_error(rdev->mddev, rdev);
3095 clear_bit(Blocked, &rdev->flags);
3096 clear_bit(BlockedBadBlocks, &rdev->flags);
3097 wake_up(&rdev->blocked_wait);
3098 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3099 md_wakeup_thread(rdev->mddev->thread);
3102 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3103 set_bit(In_sync, &rdev->flags);
3105 } else if (cmd_match(buf, "failfast")) {
3106 set_bit(FailFast, &rdev->flags);
3107 need_update_sb = true;
3109 } else if (cmd_match(buf, "-failfast")) {
3110 clear_bit(FailFast, &rdev->flags);
3111 need_update_sb = true;
3113 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3114 !test_bit(Journal, &rdev->flags)) {
3115 if (rdev->mddev->pers == NULL) {
3116 clear_bit(In_sync, &rdev->flags);
3117 rdev->saved_raid_disk = rdev->raid_disk;
3118 rdev->raid_disk = -1;
3121 } else if (cmd_match(buf, "write_error")) {
3122 set_bit(WriteErrorSeen, &rdev->flags);
3124 } else if (cmd_match(buf, "-write_error")) {
3125 clear_bit(WriteErrorSeen, &rdev->flags);
3127 } else if (cmd_match(buf, "want_replacement")) {
3128 /* Any non-spare device that is not a replacement can
3129 * become want_replacement at any time, but we then need to
3130 * check if recovery is needed.
3132 if (rdev->raid_disk >= 0 &&
3133 !test_bit(Journal, &rdev->flags) &&
3134 !test_bit(Replacement, &rdev->flags))
3135 set_bit(WantReplacement, &rdev->flags);
3136 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3137 md_wakeup_thread(rdev->mddev->thread);
3139 } else if (cmd_match(buf, "-want_replacement")) {
3140 /* Clearing 'want_replacement' is always allowed.
3141 * Once replacements starts it is too late though.
3144 clear_bit(WantReplacement, &rdev->flags);
3145 } else if (cmd_match(buf, "replacement")) {
3146 /* Can only set a device as a replacement when array has not
3147 * yet been started. Once running, replacement is automatic
3148 * from spares, or by assigning 'slot'.
3150 if (rdev->mddev->pers)
3153 set_bit(Replacement, &rdev->flags);
3156 } else if (cmd_match(buf, "-replacement")) {
3157 /* Similarly, can only clear Replacement before start */
3158 if (rdev->mddev->pers)
3161 clear_bit(Replacement, &rdev->flags);
3164 } else if (cmd_match(buf, "re-add")) {
3165 if (!rdev->mddev->pers)
3167 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3168 rdev->saved_raid_disk >= 0) {
3169 /* clear_bit is performed _after_ all the devices
3170 * have their local Faulty bit cleared. If any writes
3171 * happen in the meantime in the local node, they
3172 * will land in the local bitmap, which will be synced
3173 * by this node eventually
3175 if (!mddev_is_clustered(rdev->mddev) ||
3176 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3177 clear_bit(Faulty, &rdev->flags);
3178 err = add_bound_rdev(rdev);
3182 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3183 set_bit(ExternalBbl, &rdev->flags);
3184 rdev->badblocks.shift = 0;
3186 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3187 clear_bit(ExternalBbl, &rdev->flags);
3191 md_update_sb(mddev, 1);
3193 sysfs_notify_dirent_safe(rdev->sysfs_state);
3194 return err ? err : len;
3196 static struct rdev_sysfs_entry rdev_state =
3197 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3200 errors_show(struct md_rdev *rdev, char *page)
3202 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3206 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3211 rv = kstrtouint(buf, 10, &n);
3214 atomic_set(&rdev->corrected_errors, n);
3217 static struct rdev_sysfs_entry rdev_errors =
3218 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3221 slot_show(struct md_rdev *rdev, char *page)
3223 if (test_bit(Journal, &rdev->flags))
3224 return sprintf(page, "journal\n");
3225 else if (rdev->raid_disk < 0)
3226 return sprintf(page, "none\n");
3228 return sprintf(page, "%d\n", rdev->raid_disk);
3232 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3237 if (test_bit(Journal, &rdev->flags))
3239 if (strncmp(buf, "none", 4)==0)
3242 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3249 if (rdev->mddev->pers && slot == -1) {
3250 /* Setting 'slot' on an active array requires also
3251 * updating the 'rd%d' link, and communicating
3252 * with the personality with ->hot_*_disk.
3253 * For now we only support removing
3254 * failed/spare devices. This normally happens automatically,
3255 * but not when the metadata is externally managed.
3257 if (rdev->raid_disk == -1)
3259 /* personality does all needed checks */
3260 if (rdev->mddev->pers->hot_remove_disk == NULL)
3262 clear_bit(Blocked, &rdev->flags);
3263 remove_and_add_spares(rdev->mddev, rdev);
3264 if (rdev->raid_disk >= 0)
3266 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3267 md_wakeup_thread(rdev->mddev->thread);
3268 } else if (rdev->mddev->pers) {
3269 /* Activating a spare .. or possibly reactivating
3270 * if we ever get bitmaps working here.
3274 if (rdev->raid_disk != -1)
3277 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3280 if (rdev->mddev->pers->hot_add_disk == NULL)
3283 if (slot >= rdev->mddev->raid_disks &&
3284 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3287 rdev->raid_disk = slot;
3288 if (test_bit(In_sync, &rdev->flags))
3289 rdev->saved_raid_disk = slot;
3291 rdev->saved_raid_disk = -1;
3292 clear_bit(In_sync, &rdev->flags);
3293 clear_bit(Bitmap_sync, &rdev->flags);
3294 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3296 rdev->raid_disk = -1;
3299 sysfs_notify_dirent_safe(rdev->sysfs_state);
3300 /* failure here is OK */;
3301 sysfs_link_rdev(rdev->mddev, rdev);
3302 /* don't wakeup anyone, leave that to userspace. */
3304 if (slot >= rdev->mddev->raid_disks &&
3305 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3307 rdev->raid_disk = slot;
3308 /* assume it is working */
3309 clear_bit(Faulty, &rdev->flags);
3310 clear_bit(WriteMostly, &rdev->flags);
3311 set_bit(In_sync, &rdev->flags);
3312 sysfs_notify_dirent_safe(rdev->sysfs_state);
3317 static struct rdev_sysfs_entry rdev_slot =
3318 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3321 offset_show(struct md_rdev *rdev, char *page)
3323 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3327 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3329 unsigned long long offset;
3330 if (kstrtoull(buf, 10, &offset) < 0)
3332 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3334 if (rdev->sectors && rdev->mddev->external)
3335 /* Must set offset before size, so overlap checks
3338 rdev->data_offset = offset;
3339 rdev->new_data_offset = offset;
3343 static struct rdev_sysfs_entry rdev_offset =
3344 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3346 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3348 return sprintf(page, "%llu\n",
3349 (unsigned long long)rdev->new_data_offset);
3352 static ssize_t new_offset_store(struct md_rdev *rdev,
3353 const char *buf, size_t len)
3355 unsigned long long new_offset;
3356 struct mddev *mddev = rdev->mddev;
3358 if (kstrtoull(buf, 10, &new_offset) < 0)
3361 if (mddev->sync_thread ||
3362 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3364 if (new_offset == rdev->data_offset)
3365 /* reset is always permitted */
3367 else if (new_offset > rdev->data_offset) {
3368 /* must not push array size beyond rdev_sectors */
3369 if (new_offset - rdev->data_offset
3370 + mddev->dev_sectors > rdev->sectors)
3373 /* Metadata worries about other space details. */
3375 /* decreasing the offset is inconsistent with a backwards
3378 if (new_offset < rdev->data_offset &&
3379 mddev->reshape_backwards)
3381 /* Increasing offset is inconsistent with forwards
3382 * reshape. reshape_direction should be set to
3383 * 'backwards' first.
3385 if (new_offset > rdev->data_offset &&
3386 !mddev->reshape_backwards)
3389 if (mddev->pers && mddev->persistent &&
3390 !super_types[mddev->major_version]
3391 .allow_new_offset(rdev, new_offset))
3393 rdev->new_data_offset = new_offset;
3394 if (new_offset > rdev->data_offset)
3395 mddev->reshape_backwards = 1;
3396 else if (new_offset < rdev->data_offset)
3397 mddev->reshape_backwards = 0;
3401 static struct rdev_sysfs_entry rdev_new_offset =
3402 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3405 rdev_size_show(struct md_rdev *rdev, char *page)
3407 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3410 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3412 /* check if two start/length pairs overlap */
3420 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3422 unsigned long long blocks;
3425 if (kstrtoull(buf, 10, &blocks) < 0)
3428 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3429 return -EINVAL; /* sector conversion overflow */
3432 if (new != blocks * 2)
3433 return -EINVAL; /* unsigned long long to sector_t overflow */
3440 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3442 struct mddev *my_mddev = rdev->mddev;
3443 sector_t oldsectors = rdev->sectors;
3446 if (test_bit(Journal, &rdev->flags))
3448 if (strict_blocks_to_sectors(buf, §ors) < 0)
3450 if (rdev->data_offset != rdev->new_data_offset)
3451 return -EINVAL; /* too confusing */
3452 if (my_mddev->pers && rdev->raid_disk >= 0) {
3453 if (my_mddev->persistent) {
3454 sectors = super_types[my_mddev->major_version].
3455 rdev_size_change(rdev, sectors);
3458 } else if (!sectors)
3459 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3461 if (!my_mddev->pers->resize)
3462 /* Cannot change size for RAID0 or Linear etc */
3465 if (sectors < my_mddev->dev_sectors)
3466 return -EINVAL; /* component must fit device */
3468 rdev->sectors = sectors;
3469 if (sectors > oldsectors && my_mddev->external) {
3470 /* Need to check that all other rdevs with the same
3471 * ->bdev do not overlap. 'rcu' is sufficient to walk
3472 * the rdev lists safely.
3473 * This check does not provide a hard guarantee, it
3474 * just helps avoid dangerous mistakes.
3476 struct mddev *mddev;
3478 struct list_head *tmp;
3481 for_each_mddev(mddev, tmp) {
3482 struct md_rdev *rdev2;
3484 rdev_for_each(rdev2, mddev)
3485 if (rdev->bdev == rdev2->bdev &&
3487 overlaps(rdev->data_offset, rdev->sectors,
3500 /* Someone else could have slipped in a size
3501 * change here, but doing so is just silly.
3502 * We put oldsectors back because we *know* it is
3503 * safe, and trust userspace not to race with
3506 rdev->sectors = oldsectors;
3513 static struct rdev_sysfs_entry rdev_size =
3514 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3516 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3518 unsigned long long recovery_start = rdev->recovery_offset;
3520 if (test_bit(In_sync, &rdev->flags) ||
3521 recovery_start == MaxSector)
3522 return sprintf(page, "none\n");
3524 return sprintf(page, "%llu\n", recovery_start);
3527 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3529 unsigned long long recovery_start;
3531 if (cmd_match(buf, "none"))
3532 recovery_start = MaxSector;
3533 else if (kstrtoull(buf, 10, &recovery_start))
3536 if (rdev->mddev->pers &&
3537 rdev->raid_disk >= 0)
3540 rdev->recovery_offset = recovery_start;
3541 if (recovery_start == MaxSector)
3542 set_bit(In_sync, &rdev->flags);
3544 clear_bit(In_sync, &rdev->flags);
3548 static struct rdev_sysfs_entry rdev_recovery_start =
3549 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3551 /* sysfs access to bad-blocks list.
3552 * We present two files.
3553 * 'bad-blocks' lists sector numbers and lengths of ranges that
3554 * are recorded as bad. The list is truncated to fit within
3555 * the one-page limit of sysfs.
3556 * Writing "sector length" to this file adds an acknowledged
3558 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3559 * been acknowledged. Writing to this file adds bad blocks
3560 * without acknowledging them. This is largely for testing.
3562 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3564 return badblocks_show(&rdev->badblocks, page, 0);
3566 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3568 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3569 /* Maybe that ack was all we needed */
3570 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3571 wake_up(&rdev->blocked_wait);
3574 static struct rdev_sysfs_entry rdev_bad_blocks =
3575 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3577 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3579 return badblocks_show(&rdev->badblocks, page, 1);
3581 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3583 return badblocks_store(&rdev->badblocks, page, len, 1);
3585 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3586 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3589 ppl_sector_show(struct md_rdev *rdev, char *page)
3591 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3595 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3597 unsigned long long sector;
3599 if (kstrtoull(buf, 10, §or) < 0)
3601 if (sector != (sector_t)sector)
3604 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3605 rdev->raid_disk >= 0)
3608 if (rdev->mddev->persistent) {
3609 if (rdev->mddev->major_version == 0)
3611 if ((sector > rdev->sb_start &&
3612 sector - rdev->sb_start > S16_MAX) ||
3613 (sector < rdev->sb_start &&
3614 rdev->sb_start - sector > -S16_MIN))
3616 rdev->ppl.offset = sector - rdev->sb_start;
3617 } else if (!rdev->mddev->external) {
3620 rdev->ppl.sector = sector;
3624 static struct rdev_sysfs_entry rdev_ppl_sector =
3625 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3628 ppl_size_show(struct md_rdev *rdev, char *page)
3630 return sprintf(page, "%u\n", rdev->ppl.size);
3634 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3638 if (kstrtouint(buf, 10, &size) < 0)
3641 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3642 rdev->raid_disk >= 0)
3645 if (rdev->mddev->persistent) {
3646 if (rdev->mddev->major_version == 0)
3650 } else if (!rdev->mddev->external) {
3653 rdev->ppl.size = size;
3657 static struct rdev_sysfs_entry rdev_ppl_size =
3658 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3660 static struct attribute *rdev_default_attrs[] = {
3665 &rdev_new_offset.attr,
3667 &rdev_recovery_start.attr,
3668 &rdev_bad_blocks.attr,
3669 &rdev_unack_bad_blocks.attr,
3670 &rdev_ppl_sector.attr,
3671 &rdev_ppl_size.attr,
3675 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3677 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3678 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3684 return entry->show(rdev, page);
3688 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3689 const char *page, size_t length)
3691 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3692 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3694 struct mddev *mddev = rdev->mddev;
3698 if (!capable(CAP_SYS_ADMIN))
3700 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3702 if (rdev->mddev == NULL)
3705 rv = entry->store(rdev, page, length);
3706 mddev_unlock(mddev);
3711 static void rdev_free(struct kobject *ko)
3713 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3716 static const struct sysfs_ops rdev_sysfs_ops = {
3717 .show = rdev_attr_show,
3718 .store = rdev_attr_store,
3720 static struct kobj_type rdev_ktype = {
3721 .release = rdev_free,
3722 .sysfs_ops = &rdev_sysfs_ops,
3723 .default_attrs = rdev_default_attrs,
3726 int md_rdev_init(struct md_rdev *rdev)
3729 rdev->saved_raid_disk = -1;
3730 rdev->raid_disk = -1;
3732 rdev->data_offset = 0;
3733 rdev->new_data_offset = 0;
3734 rdev->sb_events = 0;
3735 rdev->last_read_error = 0;
3736 rdev->sb_loaded = 0;
3737 rdev->bb_page = NULL;
3738 atomic_set(&rdev->nr_pending, 0);
3739 atomic_set(&rdev->read_errors, 0);
3740 atomic_set(&rdev->corrected_errors, 0);
3742 INIT_LIST_HEAD(&rdev->same_set);
3743 init_waitqueue_head(&rdev->blocked_wait);
3745 /* Add space to store bad block list.
3746 * This reserves the space even on arrays where it cannot
3747 * be used - I wonder if that matters
3749 return badblocks_init(&rdev->badblocks, 0);
3751 EXPORT_SYMBOL_GPL(md_rdev_init);
3753 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3755 * mark the device faulty if:
3757 * - the device is nonexistent (zero size)
3758 * - the device has no valid superblock
3760 * a faulty rdev _never_ has rdev->sb set.
3762 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3764 char b[BDEVNAME_SIZE];
3766 struct md_rdev *rdev;
3769 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3771 return ERR_PTR(-ENOMEM);
3773 err = md_rdev_init(rdev);
3776 err = alloc_disk_sb(rdev);
3780 err = lock_rdev(rdev, newdev, super_format == -2);
3784 kobject_init(&rdev->kobj, &rdev_ktype);
3786 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3788 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3789 bdevname(rdev->bdev,b));
3794 if (super_format >= 0) {
3795 err = super_types[super_format].
3796 load_super(rdev, NULL, super_minor);
3797 if (err == -EINVAL) {
3798 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3799 bdevname(rdev->bdev,b),
3800 super_format, super_minor);
3804 pr_warn("md: could not read %s's sb, not importing!\n",
3805 bdevname(rdev->bdev,b));
3815 md_rdev_clear(rdev);
3817 return ERR_PTR(err);
3821 * Check a full RAID array for plausibility
3824 static int analyze_sbs(struct mddev *mddev)
3827 struct md_rdev *rdev, *freshest, *tmp;
3828 char b[BDEVNAME_SIZE];
3831 rdev_for_each_safe(rdev, tmp, mddev)
3832 switch (super_types[mddev->major_version].
3833 load_super(rdev, freshest, mddev->minor_version)) {
3840 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3841 bdevname(rdev->bdev,b));
3842 md_kick_rdev_from_array(rdev);
3845 /* Cannot find a valid fresh disk */
3847 pr_warn("md: cannot find a valid disk\n");
3851 super_types[mddev->major_version].
3852 validate_super(mddev, NULL/*freshest*/, freshest);
3855 rdev_for_each_safe(rdev, tmp, mddev) {
3856 if (mddev->max_disks &&
3857 (rdev->desc_nr >= mddev->max_disks ||
3858 i > mddev->max_disks)) {
3859 pr_warn("md: %s: %s: only %d devices permitted\n",
3860 mdname(mddev), bdevname(rdev->bdev, b),
3862 md_kick_rdev_from_array(rdev);
3865 if (rdev != freshest) {
3866 if (super_types[mddev->major_version].
3867 validate_super(mddev, freshest, rdev)) {
3868 pr_warn("md: kicking non-fresh %s from array!\n",
3869 bdevname(rdev->bdev,b));
3870 md_kick_rdev_from_array(rdev);
3874 if (mddev->level == LEVEL_MULTIPATH) {
3875 rdev->desc_nr = i++;
3876 rdev->raid_disk = rdev->desc_nr;
3877 set_bit(In_sync, &rdev->flags);
3878 } else if (rdev->raid_disk >=
3879 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3880 !test_bit(Journal, &rdev->flags)) {
3881 rdev->raid_disk = -1;
3882 clear_bit(In_sync, &rdev->flags);
3889 /* Read a fixed-point number.
3890 * Numbers in sysfs attributes should be in "standard" units where
3891 * possible, so time should be in seconds.
3892 * However we internally use a a much smaller unit such as
3893 * milliseconds or jiffies.
3894 * This function takes a decimal number with a possible fractional
3895 * component, and produces an integer which is the result of
3896 * multiplying that number by 10^'scale'.
3897 * all without any floating-point arithmetic.
3899 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3901 unsigned long result = 0;
3903 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3906 else if (decimals < scale) {
3909 result = result * 10 + value;
3921 *res = result * int_pow(10, scale - decimals);
3926 safe_delay_show(struct mddev *mddev, char *page)
3928 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3930 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3933 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3937 if (mddev_is_clustered(mddev)) {
3938 pr_warn("md: Safemode is disabled for clustered mode\n");
3942 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3945 mddev->safemode_delay = 0;
3947 unsigned long old_delay = mddev->safemode_delay;
3948 unsigned long new_delay = (msec*HZ)/1000;
3952 mddev->safemode_delay = new_delay;
3953 if (new_delay < old_delay || old_delay == 0)
3954 mod_timer(&mddev->safemode_timer, jiffies+1);
3958 static struct md_sysfs_entry md_safe_delay =
3959 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3962 level_show(struct mddev *mddev, char *page)
3964 struct md_personality *p;
3966 spin_lock(&mddev->lock);
3969 ret = sprintf(page, "%s\n", p->name);
3970 else if (mddev->clevel[0])
3971 ret = sprintf(page, "%s\n", mddev->clevel);
3972 else if (mddev->level != LEVEL_NONE)
3973 ret = sprintf(page, "%d\n", mddev->level);
3976 spin_unlock(&mddev->lock);
3981 level_store(struct mddev *mddev, const char *buf, size_t len)
3986 struct md_personality *pers, *oldpers;
3988 void *priv, *oldpriv;
3989 struct md_rdev *rdev;
3991 if (slen == 0 || slen >= sizeof(clevel))
3994 rv = mddev_lock(mddev);
3998 if (mddev->pers == NULL) {
3999 strncpy(mddev->clevel, buf, slen);
4000 if (mddev->clevel[slen-1] == '\n')
4002 mddev->clevel[slen] = 0;
4003 mddev->level = LEVEL_NONE;
4011 /* request to change the personality. Need to ensure:
4012 * - array is not engaged in resync/recovery/reshape
4013 * - old personality can be suspended
4014 * - new personality will access other array.
4018 if (mddev->sync_thread ||
4019 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4020 mddev->reshape_position != MaxSector ||
4021 mddev->sysfs_active)
4025 if (!mddev->pers->quiesce) {
4026 pr_warn("md: %s: %s does not support online personality change\n",
4027 mdname(mddev), mddev->pers->name);
4031 /* Now find the new personality */
4032 strncpy(clevel, buf, slen);
4033 if (clevel[slen-1] == '\n')
4036 if (kstrtol(clevel, 10, &level))
4039 if (request_module("md-%s", clevel) != 0)
4040 request_module("md-level-%s", clevel);
4041 spin_lock(&pers_lock);
4042 pers = find_pers(level, clevel);
4043 if (!pers || !try_module_get(pers->owner)) {
4044 spin_unlock(&pers_lock);
4045 pr_warn("md: personality %s not loaded\n", clevel);
4049 spin_unlock(&pers_lock);
4051 if (pers == mddev->pers) {
4052 /* Nothing to do! */
4053 module_put(pers->owner);
4057 if (!pers->takeover) {
4058 module_put(pers->owner);
4059 pr_warn("md: %s: %s does not support personality takeover\n",
4060 mdname(mddev), clevel);
4065 rdev_for_each(rdev, mddev)
4066 rdev->new_raid_disk = rdev->raid_disk;
4068 /* ->takeover must set new_* and/or delta_disks
4069 * if it succeeds, and may set them when it fails.
4071 priv = pers->takeover(mddev);
4073 mddev->new_level = mddev->level;
4074 mddev->new_layout = mddev->layout;
4075 mddev->new_chunk_sectors = mddev->chunk_sectors;
4076 mddev->raid_disks -= mddev->delta_disks;
4077 mddev->delta_disks = 0;
4078 mddev->reshape_backwards = 0;
4079 module_put(pers->owner);
4080 pr_warn("md: %s: %s would not accept array\n",
4081 mdname(mddev), clevel);
4086 /* Looks like we have a winner */
4087 mddev_suspend(mddev);
4088 mddev_detach(mddev);
4090 spin_lock(&mddev->lock);
4091 oldpers = mddev->pers;
4092 oldpriv = mddev->private;
4094 mddev->private = priv;
4095 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4096 mddev->level = mddev->new_level;
4097 mddev->layout = mddev->new_layout;
4098 mddev->chunk_sectors = mddev->new_chunk_sectors;
4099 mddev->delta_disks = 0;
4100 mddev->reshape_backwards = 0;
4101 mddev->degraded = 0;
4102 spin_unlock(&mddev->lock);
4104 if (oldpers->sync_request == NULL &&
4106 /* We are converting from a no-redundancy array
4107 * to a redundancy array and metadata is managed
4108 * externally so we need to be sure that writes
4109 * won't block due to a need to transition
4111 * until external management is started.
4114 mddev->safemode_delay = 0;
4115 mddev->safemode = 0;
4118 oldpers->free(mddev, oldpriv);
4120 if (oldpers->sync_request == NULL &&
4121 pers->sync_request != NULL) {
4122 /* need to add the md_redundancy_group */
4123 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4124 pr_warn("md: cannot register extra attributes for %s\n",
4126 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4127 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4128 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4130 if (oldpers->sync_request != NULL &&
4131 pers->sync_request == NULL) {
4132 /* need to remove the md_redundancy_group */
4133 if (mddev->to_remove == NULL)
4134 mddev->to_remove = &md_redundancy_group;
4137 module_put(oldpers->owner);
4139 rdev_for_each(rdev, mddev) {
4140 if (rdev->raid_disk < 0)
4142 if (rdev->new_raid_disk >= mddev->raid_disks)
4143 rdev->new_raid_disk = -1;
4144 if (rdev->new_raid_disk == rdev->raid_disk)
4146 sysfs_unlink_rdev(mddev, rdev);
4148 rdev_for_each(rdev, mddev) {
4149 if (rdev->raid_disk < 0)
4151 if (rdev->new_raid_disk == rdev->raid_disk)
4153 rdev->raid_disk = rdev->new_raid_disk;
4154 if (rdev->raid_disk < 0)
4155 clear_bit(In_sync, &rdev->flags);
4157 if (sysfs_link_rdev(mddev, rdev))
4158 pr_warn("md: cannot register rd%d for %s after level change\n",
4159 rdev->raid_disk, mdname(mddev));
4163 if (pers->sync_request == NULL) {
4164 /* this is now an array without redundancy, so
4165 * it must always be in_sync
4168 del_timer_sync(&mddev->safemode_timer);
4170 blk_set_stacking_limits(&mddev->queue->limits);
4172 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4173 mddev_resume(mddev);
4175 md_update_sb(mddev, 1);
4176 sysfs_notify_dirent_safe(mddev->sysfs_level);
4177 md_new_event(mddev);
4180 mddev_unlock(mddev);
4184 static struct md_sysfs_entry md_level =
4185 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4188 layout_show(struct mddev *mddev, char *page)
4190 /* just a number, not meaningful for all levels */
4191 if (mddev->reshape_position != MaxSector &&
4192 mddev->layout != mddev->new_layout)
4193 return sprintf(page, "%d (%d)\n",
4194 mddev->new_layout, mddev->layout);
4195 return sprintf(page, "%d\n", mddev->layout);
4199 layout_store(struct mddev *mddev, const char *buf, size_t len)
4204 err = kstrtouint(buf, 10, &n);
4207 err = mddev_lock(mddev);
4212 if (mddev->pers->check_reshape == NULL)
4217 mddev->new_layout = n;
4218 err = mddev->pers->check_reshape(mddev);
4220 mddev->new_layout = mddev->layout;
4223 mddev->new_layout = n;
4224 if (mddev->reshape_position == MaxSector)
4227 mddev_unlock(mddev);
4230 static struct md_sysfs_entry md_layout =
4231 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4234 raid_disks_show(struct mddev *mddev, char *page)
4236 if (mddev->raid_disks == 0)
4238 if (mddev->reshape_position != MaxSector &&
4239 mddev->delta_disks != 0)
4240 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4241 mddev->raid_disks - mddev->delta_disks);
4242 return sprintf(page, "%d\n", mddev->raid_disks);
4245 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4248 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4253 err = kstrtouint(buf, 10, &n);
4257 err = mddev_lock(mddev);
4261 err = update_raid_disks(mddev, n);
4262 else if (mddev->reshape_position != MaxSector) {
4263 struct md_rdev *rdev;
4264 int olddisks = mddev->raid_disks - mddev->delta_disks;
4267 rdev_for_each(rdev, mddev) {
4269 rdev->data_offset < rdev->new_data_offset)
4272 rdev->data_offset > rdev->new_data_offset)
4276 mddev->delta_disks = n - olddisks;
4277 mddev->raid_disks = n;
4278 mddev->reshape_backwards = (mddev->delta_disks < 0);
4280 mddev->raid_disks = n;
4282 mddev_unlock(mddev);
4283 return err ? err : len;
4285 static struct md_sysfs_entry md_raid_disks =
4286 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4289 uuid_show(struct mddev *mddev, char *page)
4291 return sprintf(page, "%pU\n", mddev->uuid);
4293 static struct md_sysfs_entry md_uuid =
4294 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4297 chunk_size_show(struct mddev *mddev, char *page)
4299 if (mddev->reshape_position != MaxSector &&
4300 mddev->chunk_sectors != mddev->new_chunk_sectors)
4301 return sprintf(page, "%d (%d)\n",
4302 mddev->new_chunk_sectors << 9,
4303 mddev->chunk_sectors << 9);
4304 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4308 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4313 err = kstrtoul(buf, 10, &n);
4317 err = mddev_lock(mddev);
4321 if (mddev->pers->check_reshape == NULL)
4326 mddev->new_chunk_sectors = n >> 9;
4327 err = mddev->pers->check_reshape(mddev);
4329 mddev->new_chunk_sectors = mddev->chunk_sectors;
4332 mddev->new_chunk_sectors = n >> 9;
4333 if (mddev->reshape_position == MaxSector)
4334 mddev->chunk_sectors = n >> 9;
4336 mddev_unlock(mddev);
4339 static struct md_sysfs_entry md_chunk_size =
4340 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4343 resync_start_show(struct mddev *mddev, char *page)
4345 if (mddev->recovery_cp == MaxSector)
4346 return sprintf(page, "none\n");
4347 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4351 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4353 unsigned long long n;
4356 if (cmd_match(buf, "none"))
4359 err = kstrtoull(buf, 10, &n);
4362 if (n != (sector_t)n)
4366 err = mddev_lock(mddev);
4369 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4373 mddev->recovery_cp = n;
4375 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4377 mddev_unlock(mddev);
4380 static struct md_sysfs_entry md_resync_start =
4381 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4382 resync_start_show, resync_start_store);
4385 * The array state can be:
4388 * No devices, no size, no level
4389 * Equivalent to STOP_ARRAY ioctl
4391 * May have some settings, but array is not active
4392 * all IO results in error
4393 * When written, doesn't tear down array, but just stops it
4394 * suspended (not supported yet)
4395 * All IO requests will block. The array can be reconfigured.
4396 * Writing this, if accepted, will block until array is quiescent
4398 * no resync can happen. no superblocks get written.
4399 * write requests fail
4401 * like readonly, but behaves like 'clean' on a write request.
4403 * clean - no pending writes, but otherwise active.
4404 * When written to inactive array, starts without resync
4405 * If a write request arrives then
4406 * if metadata is known, mark 'dirty' and switch to 'active'.
4407 * if not known, block and switch to write-pending
4408 * If written to an active array that has pending writes, then fails.
4410 * fully active: IO and resync can be happening.
4411 * When written to inactive array, starts with resync
4414 * clean, but writes are blocked waiting for 'active' to be written.
4417 * like active, but no writes have been seen for a while (100msec).
4420 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4421 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4422 * when a member is gone, so this state will at least alert the
4423 * user that something is wrong.
4425 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4426 write_pending, active_idle, broken, bad_word};
4427 static char *array_states[] = {
4428 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4429 "write-pending", "active-idle", "broken", NULL };
4431 static int match_word(const char *word, char **list)
4434 for (n=0; list[n]; n++)
4435 if (cmd_match(word, list[n]))
4441 array_state_show(struct mddev *mddev, char *page)
4443 enum array_state st = inactive;
4445 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4454 spin_lock(&mddev->lock);
4455 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4457 else if (mddev->in_sync)
4459 else if (mddev->safemode)
4463 spin_unlock(&mddev->lock);
4466 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4469 if (list_empty(&mddev->disks) &&
4470 mddev->raid_disks == 0 &&
4471 mddev->dev_sectors == 0)
4476 return sprintf(page, "%s\n", array_states[st]);
4479 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4480 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4481 static int restart_array(struct mddev *mddev);
4484 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4487 enum array_state st = match_word(buf, array_states);
4489 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4490 /* don't take reconfig_mutex when toggling between
4493 spin_lock(&mddev->lock);
4495 restart_array(mddev);
4496 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4497 md_wakeup_thread(mddev->thread);
4498 wake_up(&mddev->sb_wait);
4499 } else /* st == clean */ {
4500 restart_array(mddev);
4501 if (!set_in_sync(mddev))
4505 sysfs_notify_dirent_safe(mddev->sysfs_state);
4506 spin_unlock(&mddev->lock);
4509 err = mddev_lock(mddev);
4517 /* stopping an active array */
4518 err = do_md_stop(mddev, 0, NULL);
4521 /* stopping an active array */
4523 err = do_md_stop(mddev, 2, NULL);
4525 err = 0; /* already inactive */
4528 break; /* not supported yet */
4531 err = md_set_readonly(mddev, NULL);
4534 set_disk_ro(mddev->gendisk, 1);
4535 err = do_md_run(mddev);
4541 err = md_set_readonly(mddev, NULL);
4542 else if (mddev->ro == 1)
4543 err = restart_array(mddev);
4546 set_disk_ro(mddev->gendisk, 0);
4550 err = do_md_run(mddev);
4555 err = restart_array(mddev);
4558 spin_lock(&mddev->lock);
4559 if (!set_in_sync(mddev))
4561 spin_unlock(&mddev->lock);
4567 err = restart_array(mddev);
4570 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4571 wake_up(&mddev->sb_wait);
4575 set_disk_ro(mddev->gendisk, 0);
4576 err = do_md_run(mddev);
4582 /* these cannot be set */
4587 if (mddev->hold_active == UNTIL_IOCTL)
4588 mddev->hold_active = 0;
4589 sysfs_notify_dirent_safe(mddev->sysfs_state);
4591 mddev_unlock(mddev);
4594 static struct md_sysfs_entry md_array_state =
4595 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4598 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4599 return sprintf(page, "%d\n",
4600 atomic_read(&mddev->max_corr_read_errors));
4604 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4609 rv = kstrtouint(buf, 10, &n);
4614 atomic_set(&mddev->max_corr_read_errors, n);
4618 static struct md_sysfs_entry max_corr_read_errors =
4619 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4620 max_corrected_read_errors_store);
4623 null_show(struct mddev *mddev, char *page)
4628 /* need to ensure rdev_delayed_delete() has completed */
4629 static void flush_rdev_wq(struct mddev *mddev)
4631 struct md_rdev *rdev;
4634 rdev_for_each_rcu(rdev, mddev)
4635 if (work_pending(&rdev->del_work)) {
4636 flush_workqueue(md_rdev_misc_wq);
4643 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4645 /* buf must be %d:%d\n? giving major and minor numbers */
4646 /* The new device is added to the array.
4647 * If the array has a persistent superblock, we read the
4648 * superblock to initialise info and check validity.
4649 * Otherwise, only checking done is that in bind_rdev_to_array,
4650 * which mainly checks size.
4653 int major = simple_strtoul(buf, &e, 10);
4656 struct md_rdev *rdev;
4659 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4661 minor = simple_strtoul(e+1, &e, 10);
4662 if (*e && *e != '\n')
4664 dev = MKDEV(major, minor);
4665 if (major != MAJOR(dev) ||
4666 minor != MINOR(dev))
4669 flush_rdev_wq(mddev);
4670 err = mddev_lock(mddev);
4673 if (mddev->persistent) {
4674 rdev = md_import_device(dev, mddev->major_version,
4675 mddev->minor_version);
4676 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4677 struct md_rdev *rdev0
4678 = list_entry(mddev->disks.next,
4679 struct md_rdev, same_set);
4680 err = super_types[mddev->major_version]
4681 .load_super(rdev, rdev0, mddev->minor_version);
4685 } else if (mddev->external)
4686 rdev = md_import_device(dev, -2, -1);
4688 rdev = md_import_device(dev, -1, -1);
4691 mddev_unlock(mddev);
4692 return PTR_ERR(rdev);
4694 err = bind_rdev_to_array(rdev, mddev);
4698 mddev_unlock(mddev);
4700 md_new_event(mddev);
4701 return err ? err : len;
4704 static struct md_sysfs_entry md_new_device =
4705 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4708 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4711 unsigned long chunk, end_chunk;
4714 err = mddev_lock(mddev);
4719 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4721 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4722 if (buf == end) break;
4723 if (*end == '-') { /* range */
4725 end_chunk = simple_strtoul(buf, &end, 0);
4726 if (buf == end) break;
4728 if (*end && !isspace(*end)) break;
4729 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4730 buf = skip_spaces(end);
4732 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4734 mddev_unlock(mddev);
4738 static struct md_sysfs_entry md_bitmap =
4739 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4742 size_show(struct mddev *mddev, char *page)
4744 return sprintf(page, "%llu\n",
4745 (unsigned long long)mddev->dev_sectors / 2);
4748 static int update_size(struct mddev *mddev, sector_t num_sectors);
4751 size_store(struct mddev *mddev, const char *buf, size_t len)
4753 /* If array is inactive, we can reduce the component size, but
4754 * not increase it (except from 0).
4755 * If array is active, we can try an on-line resize
4758 int err = strict_blocks_to_sectors(buf, §ors);
4762 err = mddev_lock(mddev);
4766 err = update_size(mddev, sectors);
4768 md_update_sb(mddev, 1);
4770 if (mddev->dev_sectors == 0 ||
4771 mddev->dev_sectors > sectors)
4772 mddev->dev_sectors = sectors;
4776 mddev_unlock(mddev);
4777 return err ? err : len;
4780 static struct md_sysfs_entry md_size =
4781 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4783 /* Metadata version.
4785 * 'none' for arrays with no metadata (good luck...)
4786 * 'external' for arrays with externally managed metadata,
4787 * or N.M for internally known formats
4790 metadata_show(struct mddev *mddev, char *page)
4792 if (mddev->persistent)
4793 return sprintf(page, "%d.%d\n",
4794 mddev->major_version, mddev->minor_version);
4795 else if (mddev->external)
4796 return sprintf(page, "external:%s\n", mddev->metadata_type);
4798 return sprintf(page, "none\n");
4802 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4807 /* Changing the details of 'external' metadata is
4808 * always permitted. Otherwise there must be
4809 * no devices attached to the array.
4812 err = mddev_lock(mddev);
4816 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4818 else if (!list_empty(&mddev->disks))
4822 if (cmd_match(buf, "none")) {
4823 mddev->persistent = 0;
4824 mddev->external = 0;
4825 mddev->major_version = 0;
4826 mddev->minor_version = 90;
4829 if (strncmp(buf, "external:", 9) == 0) {
4830 size_t namelen = len-9;
4831 if (namelen >= sizeof(mddev->metadata_type))
4832 namelen = sizeof(mddev->metadata_type)-1;
4833 strncpy(mddev->metadata_type, buf+9, namelen);
4834 mddev->metadata_type[namelen] = 0;
4835 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4836 mddev->metadata_type[--namelen] = 0;
4837 mddev->persistent = 0;
4838 mddev->external = 1;
4839 mddev->major_version = 0;
4840 mddev->minor_version = 90;
4843 major = simple_strtoul(buf, &e, 10);
4845 if (e==buf || *e != '.')
4848 minor = simple_strtoul(buf, &e, 10);
4849 if (e==buf || (*e && *e != '\n') )
4852 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4854 mddev->major_version = major;
4855 mddev->minor_version = minor;
4856 mddev->persistent = 1;
4857 mddev->external = 0;
4860 mddev_unlock(mddev);
4864 static struct md_sysfs_entry md_metadata =
4865 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4868 action_show(struct mddev *mddev, char *page)
4870 char *type = "idle";
4871 unsigned long recovery = mddev->recovery;
4872 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4874 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4875 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4876 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4878 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4879 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4881 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4885 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4887 else if (mddev->reshape_position != MaxSector)
4890 return sprintf(page, "%s\n", type);
4894 action_store(struct mddev *mddev, const char *page, size_t len)
4896 if (!mddev->pers || !mddev->pers->sync_request)
4900 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4901 if (cmd_match(page, "frozen"))
4902 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4904 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4905 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4906 mddev_lock(mddev) == 0) {
4907 if (work_pending(&mddev->del_work))
4908 flush_workqueue(md_misc_wq);
4909 if (mddev->sync_thread) {
4910 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4911 md_reap_sync_thread(mddev);
4913 mddev_unlock(mddev);
4915 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4917 else if (cmd_match(page, "resync"))
4918 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4919 else if (cmd_match(page, "recover")) {
4920 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4921 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4922 } else if (cmd_match(page, "reshape")) {
4924 if (mddev->pers->start_reshape == NULL)
4926 err = mddev_lock(mddev);
4928 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4930 } else if (mddev->reshape_position == MaxSector ||
4931 mddev->pers->check_reshape == NULL ||
4932 mddev->pers->check_reshape(mddev)) {
4933 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4934 err = mddev->pers->start_reshape(mddev);
4937 * If reshape is still in progress, and
4938 * md_check_recovery() can continue to reshape,
4939 * don't restart reshape because data can be
4940 * corrupted for raid456.
4942 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4944 mddev_unlock(mddev);
4948 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4950 if (cmd_match(page, "check"))
4951 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4952 else if (!cmd_match(page, "repair"))
4954 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4955 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4956 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4958 if (mddev->ro == 2) {
4959 /* A write to sync_action is enough to justify
4960 * canceling read-auto mode
4963 md_wakeup_thread(mddev->sync_thread);
4965 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4966 md_wakeup_thread(mddev->thread);
4967 sysfs_notify_dirent_safe(mddev->sysfs_action);
4971 static struct md_sysfs_entry md_scan_mode =
4972 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4975 last_sync_action_show(struct mddev *mddev, char *page)
4977 return sprintf(page, "%s\n", mddev->last_sync_action);
4980 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4983 mismatch_cnt_show(struct mddev *mddev, char *page)
4985 return sprintf(page, "%llu\n",
4986 (unsigned long long)
4987 atomic64_read(&mddev->resync_mismatches));
4990 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4993 sync_min_show(struct mddev *mddev, char *page)
4995 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4996 mddev->sync_speed_min ? "local": "system");
5000 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
5005 if (strncmp(buf, "system", 6)==0) {
5008 rv = kstrtouint(buf, 10, &min);
5014 mddev->sync_speed_min = min;
5018 static struct md_sysfs_entry md_sync_min =
5019 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
5022 sync_max_show(struct mddev *mddev, char *page)
5024 return sprintf(page, "%d (%s)\n", speed_max(mddev),
5025 mddev->sync_speed_max ? "local": "system");
5029 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
5034 if (strncmp(buf, "system", 6)==0) {
5037 rv = kstrtouint(buf, 10, &max);
5043 mddev->sync_speed_max = max;
5047 static struct md_sysfs_entry md_sync_max =
5048 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
5051 degraded_show(struct mddev *mddev, char *page)
5053 return sprintf(page, "%d\n", mddev->degraded);
5055 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
5058 sync_force_parallel_show(struct mddev *mddev, char *page)
5060 return sprintf(page, "%d\n", mddev->parallel_resync);
5064 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
5068 if (kstrtol(buf, 10, &n))
5071 if (n != 0 && n != 1)
5074 mddev->parallel_resync = n;
5076 if (mddev->sync_thread)
5077 wake_up(&resync_wait);
5082 /* force parallel resync, even with shared block devices */
5083 static struct md_sysfs_entry md_sync_force_parallel =
5084 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5085 sync_force_parallel_show, sync_force_parallel_store);
5088 sync_speed_show(struct mddev *mddev, char *page)
5090 unsigned long resync, dt, db;
5091 if (mddev->curr_resync == 0)
5092 return sprintf(page, "none\n");
5093 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5094 dt = (jiffies - mddev->resync_mark) / HZ;
5096 db = resync - mddev->resync_mark_cnt;
5097 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5100 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5103 sync_completed_show(struct mddev *mddev, char *page)
5105 unsigned long long max_sectors, resync;
5107 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5108 return sprintf(page, "none\n");
5110 if (mddev->curr_resync == 1 ||
5111 mddev->curr_resync == 2)
5112 return sprintf(page, "delayed\n");
5114 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5115 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5116 max_sectors = mddev->resync_max_sectors;
5118 max_sectors = mddev->dev_sectors;
5120 resync = mddev->curr_resync_completed;
5121 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5124 static struct md_sysfs_entry md_sync_completed =
5125 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5128 min_sync_show(struct mddev *mddev, char *page)
5130 return sprintf(page, "%llu\n",
5131 (unsigned long long)mddev->resync_min);
5134 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5136 unsigned long long min;
5139 if (kstrtoull(buf, 10, &min))
5142 spin_lock(&mddev->lock);
5144 if (min > mddev->resync_max)
5148 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5151 /* Round down to multiple of 4K for safety */
5152 mddev->resync_min = round_down(min, 8);
5156 spin_unlock(&mddev->lock);
5160 static struct md_sysfs_entry md_min_sync =
5161 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5164 max_sync_show(struct mddev *mddev, char *page)
5166 if (mddev->resync_max == MaxSector)
5167 return sprintf(page, "max\n");
5169 return sprintf(page, "%llu\n",
5170 (unsigned long long)mddev->resync_max);
5173 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5176 spin_lock(&mddev->lock);
5177 if (strncmp(buf, "max", 3) == 0)
5178 mddev->resync_max = MaxSector;
5180 unsigned long long max;
5184 if (kstrtoull(buf, 10, &max))
5186 if (max < mddev->resync_min)
5190 if (max < mddev->resync_max &&
5192 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5195 /* Must be a multiple of chunk_size */
5196 chunk = mddev->chunk_sectors;
5198 sector_t temp = max;
5201 if (sector_div(temp, chunk))
5204 mddev->resync_max = max;
5206 wake_up(&mddev->recovery_wait);
5209 spin_unlock(&mddev->lock);
5213 static struct md_sysfs_entry md_max_sync =
5214 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5217 suspend_lo_show(struct mddev *mddev, char *page)
5219 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5223 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5225 unsigned long long new;
5228 err = kstrtoull(buf, 10, &new);
5231 if (new != (sector_t)new)
5234 err = mddev_lock(mddev);
5238 if (mddev->pers == NULL ||
5239 mddev->pers->quiesce == NULL)
5241 mddev_suspend(mddev);
5242 mddev->suspend_lo = new;
5243 mddev_resume(mddev);
5247 mddev_unlock(mddev);
5250 static struct md_sysfs_entry md_suspend_lo =
5251 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5254 suspend_hi_show(struct mddev *mddev, char *page)
5256 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5260 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5262 unsigned long long new;
5265 err = kstrtoull(buf, 10, &new);
5268 if (new != (sector_t)new)
5271 err = mddev_lock(mddev);
5275 if (mddev->pers == NULL)
5278 mddev_suspend(mddev);
5279 mddev->suspend_hi = new;
5280 mddev_resume(mddev);
5284 mddev_unlock(mddev);
5287 static struct md_sysfs_entry md_suspend_hi =
5288 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5291 reshape_position_show(struct mddev *mddev, char *page)
5293 if (mddev->reshape_position != MaxSector)
5294 return sprintf(page, "%llu\n",
5295 (unsigned long long)mddev->reshape_position);
5296 strcpy(page, "none\n");
5301 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5303 struct md_rdev *rdev;
5304 unsigned long long new;
5307 err = kstrtoull(buf, 10, &new);
5310 if (new != (sector_t)new)
5312 err = mddev_lock(mddev);
5318 mddev->reshape_position = new;
5319 mddev->delta_disks = 0;
5320 mddev->reshape_backwards = 0;
5321 mddev->new_level = mddev->level;
5322 mddev->new_layout = mddev->layout;
5323 mddev->new_chunk_sectors = mddev->chunk_sectors;
5324 rdev_for_each(rdev, mddev)
5325 rdev->new_data_offset = rdev->data_offset;
5328 mddev_unlock(mddev);
5332 static struct md_sysfs_entry md_reshape_position =
5333 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5334 reshape_position_store);
5337 reshape_direction_show(struct mddev *mddev, char *page)
5339 return sprintf(page, "%s\n",
5340 mddev->reshape_backwards ? "backwards" : "forwards");
5344 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5349 if (cmd_match(buf, "forwards"))
5351 else if (cmd_match(buf, "backwards"))
5355 if (mddev->reshape_backwards == backwards)
5358 err = mddev_lock(mddev);
5361 /* check if we are allowed to change */
5362 if (mddev->delta_disks)
5364 else if (mddev->persistent &&
5365 mddev->major_version == 0)
5368 mddev->reshape_backwards = backwards;
5369 mddev_unlock(mddev);
5373 static struct md_sysfs_entry md_reshape_direction =
5374 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5375 reshape_direction_store);
5378 array_size_show(struct mddev *mddev, char *page)
5380 if (mddev->external_size)
5381 return sprintf(page, "%llu\n",
5382 (unsigned long long)mddev->array_sectors/2);
5384 return sprintf(page, "default\n");
5388 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5393 err = mddev_lock(mddev);
5397 /* cluster raid doesn't support change array_sectors */
5398 if (mddev_is_clustered(mddev)) {
5399 mddev_unlock(mddev);
5403 if (strncmp(buf, "default", 7) == 0) {
5405 sectors = mddev->pers->size(mddev, 0, 0);
5407 sectors = mddev->array_sectors;
5409 mddev->external_size = 0;
5411 if (strict_blocks_to_sectors(buf, §ors) < 0)
5413 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5416 mddev->external_size = 1;
5420 mddev->array_sectors = sectors;
5422 set_capacity(mddev->gendisk, mddev->array_sectors);
5423 revalidate_disk_size(mddev->gendisk, true);
5426 mddev_unlock(mddev);
5430 static struct md_sysfs_entry md_array_size =
5431 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5435 consistency_policy_show(struct mddev *mddev, char *page)
5439 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5440 ret = sprintf(page, "journal\n");
5441 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5442 ret = sprintf(page, "ppl\n");
5443 } else if (mddev->bitmap) {
5444 ret = sprintf(page, "bitmap\n");
5445 } else if (mddev->pers) {
5446 if (mddev->pers->sync_request)
5447 ret = sprintf(page, "resync\n");
5449 ret = sprintf(page, "none\n");
5451 ret = sprintf(page, "unknown\n");
5458 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5463 if (mddev->pers->change_consistency_policy)
5464 err = mddev->pers->change_consistency_policy(mddev, buf);
5467 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5468 set_bit(MD_HAS_PPL, &mddev->flags);
5473 return err ? err : len;
5476 static struct md_sysfs_entry md_consistency_policy =
5477 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5478 consistency_policy_store);
5480 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5482 return sprintf(page, "%d\n", mddev->fail_last_dev);
5486 * Setting fail_last_dev to true to allow last device to be forcibly removed
5487 * from RAID1/RAID10.
5490 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5495 ret = kstrtobool(buf, &value);
5499 if (value != mddev->fail_last_dev)
5500 mddev->fail_last_dev = value;
5504 static struct md_sysfs_entry md_fail_last_dev =
5505 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5506 fail_last_dev_store);
5508 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5510 if (mddev->pers == NULL || (mddev->pers->level != 1))
5511 return sprintf(page, "n/a\n");
5513 return sprintf(page, "%d\n", mddev->serialize_policy);
5517 * Setting serialize_policy to true to enforce write IO is not reordered
5521 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5526 err = kstrtobool(buf, &value);
5530 if (value == mddev->serialize_policy)
5533 err = mddev_lock(mddev);
5536 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5537 pr_err("md: serialize_policy is only effective for raid1\n");
5542 mddev_suspend(mddev);
5544 mddev_create_serial_pool(mddev, NULL, true);
5546 mddev_destroy_serial_pool(mddev, NULL, true);
5547 mddev->serialize_policy = value;
5548 mddev_resume(mddev);
5550 mddev_unlock(mddev);
5554 static struct md_sysfs_entry md_serialize_policy =
5555 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5556 serialize_policy_store);
5559 static struct attribute *md_default_attrs[] = {
5562 &md_raid_disks.attr,
5564 &md_chunk_size.attr,
5566 &md_resync_start.attr,
5568 &md_new_device.attr,
5569 &md_safe_delay.attr,
5570 &md_array_state.attr,
5571 &md_reshape_position.attr,
5572 &md_reshape_direction.attr,
5573 &md_array_size.attr,
5574 &max_corr_read_errors.attr,
5575 &md_consistency_policy.attr,
5576 &md_fail_last_dev.attr,
5577 &md_serialize_policy.attr,
5581 static struct attribute *md_redundancy_attrs[] = {
5583 &md_last_scan_mode.attr,
5584 &md_mismatches.attr,
5587 &md_sync_speed.attr,
5588 &md_sync_force_parallel.attr,
5589 &md_sync_completed.attr,
5592 &md_suspend_lo.attr,
5593 &md_suspend_hi.attr,
5598 static struct attribute_group md_redundancy_group = {
5600 .attrs = md_redundancy_attrs,
5604 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5606 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5607 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5612 spin_lock(&all_mddevs_lock);
5613 if (list_empty(&mddev->all_mddevs)) {
5614 spin_unlock(&all_mddevs_lock);
5618 spin_unlock(&all_mddevs_lock);
5620 rv = entry->show(mddev, page);
5626 md_attr_store(struct kobject *kobj, struct attribute *attr,
5627 const char *page, size_t length)
5629 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5630 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5635 if (!capable(CAP_SYS_ADMIN))
5637 spin_lock(&all_mddevs_lock);
5638 if (list_empty(&mddev->all_mddevs)) {
5639 spin_unlock(&all_mddevs_lock);
5643 spin_unlock(&all_mddevs_lock);
5644 rv = entry->store(mddev, page, length);
5649 static void md_free(struct kobject *ko)
5651 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5653 if (mddev->sysfs_state)
5654 sysfs_put(mddev->sysfs_state);
5655 if (mddev->sysfs_level)
5656 sysfs_put(mddev->sysfs_level);
5659 del_gendisk(mddev->gendisk);
5661 blk_cleanup_queue(mddev->queue);
5663 put_disk(mddev->gendisk);
5664 percpu_ref_exit(&mddev->writes_pending);
5666 bioset_exit(&mddev->bio_set);
5667 bioset_exit(&mddev->sync_set);
5671 static const struct sysfs_ops md_sysfs_ops = {
5672 .show = md_attr_show,
5673 .store = md_attr_store,
5675 static struct kobj_type md_ktype = {
5677 .sysfs_ops = &md_sysfs_ops,
5678 .default_attrs = md_default_attrs,
5683 static void mddev_delayed_delete(struct work_struct *ws)
5685 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5687 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5688 kobject_del(&mddev->kobj);
5689 kobject_put(&mddev->kobj);
5692 static void no_op(struct percpu_ref *r) {}
5694 int mddev_init_writes_pending(struct mddev *mddev)
5696 if (mddev->writes_pending.percpu_count_ptr)
5698 if (percpu_ref_init(&mddev->writes_pending, no_op,
5699 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5701 /* We want to start with the refcount at zero */
5702 percpu_ref_put(&mddev->writes_pending);
5705 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5707 static int md_alloc(dev_t dev, char *name)
5710 * If dev is zero, name is the name of a device to allocate with
5711 * an arbitrary minor number. It will be "md_???"
5712 * If dev is non-zero it must be a device number with a MAJOR of
5713 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5714 * the device is being created by opening a node in /dev.
5715 * If "name" is not NULL, the device is being created by
5716 * writing to /sys/module/md_mod/parameters/new_array.
5718 static DEFINE_MUTEX(disks_mutex);
5719 struct mddev *mddev = mddev_find_or_alloc(dev);
5720 struct gendisk *disk;
5729 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5730 shift = partitioned ? MdpMinorShift : 0;
5731 unit = MINOR(mddev->unit) >> shift;
5733 /* wait for any previous instance of this device to be
5734 * completely removed (mddev_delayed_delete).
5736 flush_workqueue(md_misc_wq);
5737 flush_workqueue(md_rdev_misc_wq);
5739 mutex_lock(&disks_mutex);
5745 /* Need to ensure that 'name' is not a duplicate.
5747 struct mddev *mddev2;
5748 spin_lock(&all_mddevs_lock);
5750 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5751 if (mddev2->gendisk &&
5752 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5753 spin_unlock(&all_mddevs_lock);
5756 spin_unlock(&all_mddevs_lock);
5760 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5762 mddev->hold_active = UNTIL_STOP;
5765 mddev->queue = blk_alloc_queue(NUMA_NO_NODE);
5769 blk_set_stacking_limits(&mddev->queue->limits);
5771 disk = alloc_disk(1 << shift);
5773 blk_cleanup_queue(mddev->queue);
5774 mddev->queue = NULL;
5777 disk->major = MAJOR(mddev->unit);
5778 disk->first_minor = unit << shift;
5780 strcpy(disk->disk_name, name);
5781 else if (partitioned)
5782 sprintf(disk->disk_name, "md_d%d", unit);
5784 sprintf(disk->disk_name, "md%d", unit);
5785 disk->fops = &md_fops;
5786 disk->private_data = mddev;
5787 disk->queue = mddev->queue;
5788 blk_queue_write_cache(mddev->queue, true, true);
5789 /* Allow extended partitions. This makes the
5790 * 'mdp' device redundant, but we can't really
5793 disk->flags |= GENHD_FL_EXT_DEVT;
5794 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5795 mddev->gendisk = disk;
5798 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5800 /* This isn't possible, but as kobject_init_and_add is marked
5801 * __must_check, we must do something with the result
5803 pr_debug("md: cannot register %s/md - name in use\n",
5807 if (mddev->kobj.sd &&
5808 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5809 pr_debug("pointless warning\n");
5811 mutex_unlock(&disks_mutex);
5812 if (!error && mddev->kobj.sd) {
5813 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5814 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5815 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5821 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5824 md_alloc(dev, NULL);
5828 static int add_named_array(const char *val, const struct kernel_param *kp)
5831 * val must be "md_*" or "mdNNN".
5832 * For "md_*" we allocate an array with a large free minor number, and
5833 * set the name to val. val must not already be an active name.
5834 * For "mdNNN" we allocate an array with the minor number NNN
5835 * which must not already be in use.
5837 int len = strlen(val);
5838 char buf[DISK_NAME_LEN];
5839 unsigned long devnum;
5841 while (len && val[len-1] == '\n')
5843 if (len >= DISK_NAME_LEN)
5845 strlcpy(buf, val, len+1);
5846 if (strncmp(buf, "md_", 3) == 0)
5847 return md_alloc(0, buf);
5848 if (strncmp(buf, "md", 2) == 0 &&
5850 kstrtoul(buf+2, 10, &devnum) == 0 &&
5851 devnum <= MINORMASK)
5852 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5857 static void md_safemode_timeout(struct timer_list *t)
5859 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5861 mddev->safemode = 1;
5862 if (mddev->external)
5863 sysfs_notify_dirent_safe(mddev->sysfs_state);
5865 md_wakeup_thread(mddev->thread);
5868 static int start_dirty_degraded;
5870 int md_run(struct mddev *mddev)
5873 struct md_rdev *rdev;
5874 struct md_personality *pers;
5876 if (list_empty(&mddev->disks))
5877 /* cannot run an array with no devices.. */
5882 /* Cannot run until previous stop completes properly */
5883 if (mddev->sysfs_active)
5887 * Analyze all RAID superblock(s)
5889 if (!mddev->raid_disks) {
5890 if (!mddev->persistent)
5892 err = analyze_sbs(mddev);
5897 if (mddev->level != LEVEL_NONE)
5898 request_module("md-level-%d", mddev->level);
5899 else if (mddev->clevel[0])
5900 request_module("md-%s", mddev->clevel);
5903 * Drop all container device buffers, from now on
5904 * the only valid external interface is through the md
5907 mddev->has_superblocks = false;
5908 rdev_for_each(rdev, mddev) {
5909 if (test_bit(Faulty, &rdev->flags))
5911 sync_blockdev(rdev->bdev);
5912 invalidate_bdev(rdev->bdev);
5913 if (mddev->ro != 1 &&
5914 (bdev_read_only(rdev->bdev) ||
5915 bdev_read_only(rdev->meta_bdev))) {
5918 set_disk_ro(mddev->gendisk, 1);
5922 mddev->has_superblocks = true;
5924 /* perform some consistency tests on the device.
5925 * We don't want the data to overlap the metadata,
5926 * Internal Bitmap issues have been handled elsewhere.
5928 if (rdev->meta_bdev) {
5929 /* Nothing to check */;
5930 } else if (rdev->data_offset < rdev->sb_start) {
5931 if (mddev->dev_sectors &&
5932 rdev->data_offset + mddev->dev_sectors
5934 pr_warn("md: %s: data overlaps metadata\n",
5939 if (rdev->sb_start + rdev->sb_size/512
5940 > rdev->data_offset) {
5941 pr_warn("md: %s: metadata overlaps data\n",
5946 sysfs_notify_dirent_safe(rdev->sysfs_state);
5949 if (!bioset_initialized(&mddev->bio_set)) {
5950 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5954 if (!bioset_initialized(&mddev->sync_set)) {
5955 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5960 spin_lock(&pers_lock);
5961 pers = find_pers(mddev->level, mddev->clevel);
5962 if (!pers || !try_module_get(pers->owner)) {
5963 spin_unlock(&pers_lock);
5964 if (mddev->level != LEVEL_NONE)
5965 pr_warn("md: personality for level %d is not loaded!\n",
5968 pr_warn("md: personality for level %s is not loaded!\n",
5973 spin_unlock(&pers_lock);
5974 if (mddev->level != pers->level) {
5975 mddev->level = pers->level;
5976 mddev->new_level = pers->level;
5978 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5980 if (mddev->reshape_position != MaxSector &&
5981 pers->start_reshape == NULL) {
5982 /* This personality cannot handle reshaping... */
5983 module_put(pers->owner);
5988 if (pers->sync_request) {
5989 /* Warn if this is a potentially silly
5992 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5993 struct md_rdev *rdev2;
5996 rdev_for_each(rdev, mddev)
5997 rdev_for_each(rdev2, mddev) {
5999 rdev->bdev->bd_disk ==
6000 rdev2->bdev->bd_disk) {
6001 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
6003 bdevname(rdev->bdev,b),
6004 bdevname(rdev2->bdev,b2));
6010 pr_warn("True protection against single-disk failure might be compromised.\n");
6013 mddev->recovery = 0;
6014 /* may be over-ridden by personality */
6015 mddev->resync_max_sectors = mddev->dev_sectors;
6017 mddev->ok_start_degraded = start_dirty_degraded;
6019 if (start_readonly && mddev->ro == 0)
6020 mddev->ro = 2; /* read-only, but switch on first write */
6022 err = pers->run(mddev);
6024 pr_warn("md: pers->run() failed ...\n");
6025 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
6026 WARN_ONCE(!mddev->external_size,
6027 "%s: default size too small, but 'external_size' not in effect?\n",
6029 pr_warn("md: invalid array_size %llu > default size %llu\n",
6030 (unsigned long long)mddev->array_sectors / 2,
6031 (unsigned long long)pers->size(mddev, 0, 0) / 2);
6034 if (err == 0 && pers->sync_request &&
6035 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
6036 struct bitmap *bitmap;
6038 bitmap = md_bitmap_create(mddev, -1);
6039 if (IS_ERR(bitmap)) {
6040 err = PTR_ERR(bitmap);
6041 pr_warn("%s: failed to create bitmap (%d)\n",
6042 mdname(mddev), err);
6044 mddev->bitmap = bitmap;
6050 if (mddev->bitmap_info.max_write_behind > 0) {
6051 bool create_pool = false;
6053 rdev_for_each(rdev, mddev) {
6054 if (test_bit(WriteMostly, &rdev->flags) &&
6055 rdev_init_serial(rdev))
6058 if (create_pool && mddev->serial_info_pool == NULL) {
6059 mddev->serial_info_pool =
6060 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
6061 sizeof(struct serial_info));
6062 if (!mddev->serial_info_pool) {
6072 rdev_for_each(rdev, mddev) {
6073 if (rdev->raid_disk >= 0 &&
6074 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
6079 if (mddev->degraded)
6082 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6084 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6086 if (pers->sync_request) {
6087 if (mddev->kobj.sd &&
6088 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6089 pr_warn("md: cannot register extra attributes for %s\n",
6091 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6092 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6093 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6094 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6097 atomic_set(&mddev->max_corr_read_errors,
6098 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6099 mddev->safemode = 0;
6100 if (mddev_is_clustered(mddev))
6101 mddev->safemode_delay = 0;
6103 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6106 spin_lock(&mddev->lock);
6108 spin_unlock(&mddev->lock);
6109 rdev_for_each(rdev, mddev)
6110 if (rdev->raid_disk >= 0)
6111 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6113 if (mddev->degraded && !mddev->ro)
6114 /* This ensures that recovering status is reported immediately
6115 * via sysfs - until a lack of spares is confirmed.
6117 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6118 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6120 if (mddev->sb_flags)
6121 md_update_sb(mddev, 0);
6123 md_new_event(mddev);
6127 mddev_detach(mddev);
6129 pers->free(mddev, mddev->private);
6130 mddev->private = NULL;
6131 module_put(pers->owner);
6132 md_bitmap_destroy(mddev);
6134 bioset_exit(&mddev->bio_set);
6135 bioset_exit(&mddev->sync_set);
6138 EXPORT_SYMBOL_GPL(md_run);
6140 int do_md_run(struct mddev *mddev)
6144 set_bit(MD_NOT_READY, &mddev->flags);
6145 err = md_run(mddev);
6148 err = md_bitmap_load(mddev);
6150 md_bitmap_destroy(mddev);
6154 if (mddev_is_clustered(mddev))
6155 md_allow_write(mddev);
6157 /* run start up tasks that require md_thread */
6160 md_wakeup_thread(mddev->thread);
6161 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6163 set_capacity(mddev->gendisk, mddev->array_sectors);
6164 revalidate_disk_size(mddev->gendisk, true);
6165 clear_bit(MD_NOT_READY, &mddev->flags);
6167 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6168 sysfs_notify_dirent_safe(mddev->sysfs_state);
6169 sysfs_notify_dirent_safe(mddev->sysfs_action);
6170 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6172 clear_bit(MD_NOT_READY, &mddev->flags);
6176 int md_start(struct mddev *mddev)
6180 if (mddev->pers->start) {
6181 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6182 md_wakeup_thread(mddev->thread);
6183 ret = mddev->pers->start(mddev);
6184 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6185 md_wakeup_thread(mddev->sync_thread);
6189 EXPORT_SYMBOL_GPL(md_start);
6191 static int restart_array(struct mddev *mddev)
6193 struct gendisk *disk = mddev->gendisk;
6194 struct md_rdev *rdev;
6195 bool has_journal = false;
6196 bool has_readonly = false;
6198 /* Complain if it has no devices */
6199 if (list_empty(&mddev->disks))
6207 rdev_for_each_rcu(rdev, mddev) {
6208 if (test_bit(Journal, &rdev->flags) &&
6209 !test_bit(Faulty, &rdev->flags))
6211 if (bdev_read_only(rdev->bdev))
6212 has_readonly = true;
6215 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6216 /* Don't restart rw with journal missing/faulty */
6221 mddev->safemode = 0;
6223 set_disk_ro(disk, 0);
6224 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6225 /* Kick recovery or resync if necessary */
6226 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6227 md_wakeup_thread(mddev->thread);
6228 md_wakeup_thread(mddev->sync_thread);
6229 sysfs_notify_dirent_safe(mddev->sysfs_state);
6233 static void md_clean(struct mddev *mddev)
6235 mddev->array_sectors = 0;
6236 mddev->external_size = 0;
6237 mddev->dev_sectors = 0;
6238 mddev->raid_disks = 0;
6239 mddev->recovery_cp = 0;
6240 mddev->resync_min = 0;
6241 mddev->resync_max = MaxSector;
6242 mddev->reshape_position = MaxSector;
6243 mddev->external = 0;
6244 mddev->persistent = 0;
6245 mddev->level = LEVEL_NONE;
6246 mddev->clevel[0] = 0;
6248 * Don't clear MD_CLOSING, or mddev can be opened again.
6249 * 'hold_active != 0' means mddev is still in the creation
6250 * process and will be used later.
6252 if (mddev->hold_active)
6255 mddev->flags &= BIT_ULL_MASK(MD_CLOSING);
6256 mddev->sb_flags = 0;
6258 mddev->metadata_type[0] = 0;
6259 mddev->chunk_sectors = 0;
6260 mddev->ctime = mddev->utime = 0;
6262 mddev->max_disks = 0;
6264 mddev->can_decrease_events = 0;
6265 mddev->delta_disks = 0;
6266 mddev->reshape_backwards = 0;
6267 mddev->new_level = LEVEL_NONE;
6268 mddev->new_layout = 0;
6269 mddev->new_chunk_sectors = 0;
6270 mddev->curr_resync = 0;
6271 atomic64_set(&mddev->resync_mismatches, 0);
6272 mddev->suspend_lo = mddev->suspend_hi = 0;
6273 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6274 mddev->recovery = 0;
6277 mddev->degraded = 0;
6278 mddev->safemode = 0;
6279 mddev->private = NULL;
6280 mddev->cluster_info = NULL;
6281 mddev->bitmap_info.offset = 0;
6282 mddev->bitmap_info.default_offset = 0;
6283 mddev->bitmap_info.default_space = 0;
6284 mddev->bitmap_info.chunksize = 0;
6285 mddev->bitmap_info.daemon_sleep = 0;
6286 mddev->bitmap_info.max_write_behind = 0;
6287 mddev->bitmap_info.nodes = 0;
6290 static void __md_stop_writes(struct mddev *mddev)
6292 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6293 if (work_pending(&mddev->del_work))
6294 flush_workqueue(md_misc_wq);
6295 if (mddev->sync_thread) {
6296 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6297 md_reap_sync_thread(mddev);
6300 del_timer_sync(&mddev->safemode_timer);
6302 if (mddev->pers && mddev->pers->quiesce) {
6303 mddev->pers->quiesce(mddev, 1);
6304 mddev->pers->quiesce(mddev, 0);
6306 md_bitmap_flush(mddev);
6308 if (mddev->ro == 0 &&
6309 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6311 /* mark array as shutdown cleanly */
6312 if (!mddev_is_clustered(mddev))
6314 md_update_sb(mddev, 1);
6316 /* disable policy to guarantee rdevs free resources for serialization */
6317 mddev->serialize_policy = 0;
6318 mddev_destroy_serial_pool(mddev, NULL, true);
6321 void md_stop_writes(struct mddev *mddev)
6323 mddev_lock_nointr(mddev);
6324 __md_stop_writes(mddev);
6325 mddev_unlock(mddev);
6327 EXPORT_SYMBOL_GPL(md_stop_writes);
6329 static void mddev_detach(struct mddev *mddev)
6331 md_bitmap_wait_behind_writes(mddev);
6332 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6333 mddev->pers->quiesce(mddev, 1);
6334 mddev->pers->quiesce(mddev, 0);
6336 md_unregister_thread(&mddev->thread);
6338 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6341 static void __md_stop(struct mddev *mddev)
6343 struct md_personality *pers = mddev->pers;
6344 md_bitmap_destroy(mddev);
6345 mddev_detach(mddev);
6346 /* Ensure ->event_work is done */
6347 if (mddev->event_work.func)
6348 flush_workqueue(md_misc_wq);
6349 spin_lock(&mddev->lock);
6351 spin_unlock(&mddev->lock);
6352 pers->free(mddev, mddev->private);
6353 mddev->private = NULL;
6354 if (pers->sync_request && mddev->to_remove == NULL)
6355 mddev->to_remove = &md_redundancy_group;
6356 module_put(pers->owner);
6357 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6360 void md_stop(struct mddev *mddev)
6362 lockdep_assert_held(&mddev->reconfig_mutex);
6364 /* stop the array and free an attached data structures.
6365 * This is called from dm-raid
6367 __md_stop_writes(mddev);
6369 bioset_exit(&mddev->bio_set);
6370 bioset_exit(&mddev->sync_set);
6373 EXPORT_SYMBOL_GPL(md_stop);
6375 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6380 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6382 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6383 md_wakeup_thread(mddev->thread);
6385 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6386 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6387 if (mddev->sync_thread)
6388 /* Thread might be blocked waiting for metadata update
6389 * which will now never happen */
6390 wake_up_process(mddev->sync_thread->tsk);
6392 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6394 mddev_unlock(mddev);
6395 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6397 wait_event(mddev->sb_wait,
6398 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6399 mddev_lock_nointr(mddev);
6401 mutex_lock(&mddev->open_mutex);
6402 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6403 mddev->sync_thread ||
6404 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6405 pr_warn("md: %s still in use.\n",mdname(mddev));
6407 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6408 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6409 md_wakeup_thread(mddev->thread);
6415 __md_stop_writes(mddev);
6421 set_disk_ro(mddev->gendisk, 1);
6422 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6423 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6424 md_wakeup_thread(mddev->thread);
6425 sysfs_notify_dirent_safe(mddev->sysfs_state);
6429 mutex_unlock(&mddev->open_mutex);
6434 * 0 - completely stop and dis-assemble array
6435 * 2 - stop but do not disassemble array
6437 static int do_md_stop(struct mddev *mddev, int mode,
6438 struct block_device *bdev)
6440 struct gendisk *disk = mddev->gendisk;
6441 struct md_rdev *rdev;
6444 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6446 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6447 md_wakeup_thread(mddev->thread);
6449 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6450 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6451 if (mddev->sync_thread)
6452 /* Thread might be blocked waiting for metadata update
6453 * which will now never happen */
6454 wake_up_process(mddev->sync_thread->tsk);
6456 mddev_unlock(mddev);
6457 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6458 !test_bit(MD_RECOVERY_RUNNING,
6459 &mddev->recovery)));
6460 mddev_lock_nointr(mddev);
6462 mutex_lock(&mddev->open_mutex);
6463 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6464 mddev->sysfs_active ||
6465 mddev->sync_thread ||
6466 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6467 pr_warn("md: %s still in use.\n",mdname(mddev));
6468 mutex_unlock(&mddev->open_mutex);
6470 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6471 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6472 md_wakeup_thread(mddev->thread);
6478 set_disk_ro(disk, 0);
6480 __md_stop_writes(mddev);
6483 /* tell userspace to handle 'inactive' */
6484 sysfs_notify_dirent_safe(mddev->sysfs_state);
6486 rdev_for_each(rdev, mddev)
6487 if (rdev->raid_disk >= 0)
6488 sysfs_unlink_rdev(mddev, rdev);
6490 set_capacity(disk, 0);
6491 mutex_unlock(&mddev->open_mutex);
6493 revalidate_disk_size(disk, true);
6498 mutex_unlock(&mddev->open_mutex);
6500 * Free resources if final stop
6503 pr_info("md: %s stopped.\n", mdname(mddev));
6505 if (mddev->bitmap_info.file) {
6506 struct file *f = mddev->bitmap_info.file;
6507 spin_lock(&mddev->lock);
6508 mddev->bitmap_info.file = NULL;
6509 spin_unlock(&mddev->lock);
6512 mddev->bitmap_info.offset = 0;
6514 export_array(mddev);
6517 if (mddev->hold_active == UNTIL_STOP)
6518 mddev->hold_active = 0;
6520 md_new_event(mddev);
6521 sysfs_notify_dirent_safe(mddev->sysfs_state);
6526 static void autorun_array(struct mddev *mddev)
6528 struct md_rdev *rdev;
6531 if (list_empty(&mddev->disks))
6534 pr_info("md: running: ");
6536 rdev_for_each(rdev, mddev) {
6537 char b[BDEVNAME_SIZE];
6538 pr_cont("<%s>", bdevname(rdev->bdev,b));
6542 err = do_md_run(mddev);
6544 pr_warn("md: do_md_run() returned %d\n", err);
6545 do_md_stop(mddev, 0, NULL);
6550 * lets try to run arrays based on all disks that have arrived
6551 * until now. (those are in pending_raid_disks)
6553 * the method: pick the first pending disk, collect all disks with
6554 * the same UUID, remove all from the pending list and put them into
6555 * the 'same_array' list. Then order this list based on superblock
6556 * update time (freshest comes first), kick out 'old' disks and
6557 * compare superblocks. If everything's fine then run it.
6559 * If "unit" is allocated, then bump its reference count
6561 static void autorun_devices(int part)
6563 struct md_rdev *rdev0, *rdev, *tmp;
6564 struct mddev *mddev;
6565 char b[BDEVNAME_SIZE];
6567 pr_info("md: autorun ...\n");
6568 while (!list_empty(&pending_raid_disks)) {
6571 LIST_HEAD(candidates);
6572 rdev0 = list_entry(pending_raid_disks.next,
6573 struct md_rdev, same_set);
6575 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6576 INIT_LIST_HEAD(&candidates);
6577 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6578 if (super_90_load(rdev, rdev0, 0) >= 0) {
6579 pr_debug("md: adding %s ...\n",
6580 bdevname(rdev->bdev,b));
6581 list_move(&rdev->same_set, &candidates);
6584 * now we have a set of devices, with all of them having
6585 * mostly sane superblocks. It's time to allocate the
6589 dev = MKDEV(mdp_major,
6590 rdev0->preferred_minor << MdpMinorShift);
6591 unit = MINOR(dev) >> MdpMinorShift;
6593 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6596 if (rdev0->preferred_minor != unit) {
6597 pr_warn("md: unit number in %s is bad: %d\n",
6598 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6602 md_probe(dev, NULL, NULL);
6603 mddev = mddev_find(dev);
6607 if (mddev_lock(mddev))
6608 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6609 else if (mddev->raid_disks || mddev->major_version
6610 || !list_empty(&mddev->disks)) {
6611 pr_warn("md: %s already running, cannot run %s\n",
6612 mdname(mddev), bdevname(rdev0->bdev,b));
6613 mddev_unlock(mddev);
6615 pr_debug("md: created %s\n", mdname(mddev));
6616 mddev->persistent = 1;
6617 rdev_for_each_list(rdev, tmp, &candidates) {
6618 list_del_init(&rdev->same_set);
6619 if (bind_rdev_to_array(rdev, mddev))
6622 autorun_array(mddev);
6623 mddev_unlock(mddev);
6625 /* on success, candidates will be empty, on error
6628 rdev_for_each_list(rdev, tmp, &candidates) {
6629 list_del_init(&rdev->same_set);
6634 pr_info("md: ... autorun DONE.\n");
6636 #endif /* !MODULE */
6638 static int get_version(void __user *arg)
6642 ver.major = MD_MAJOR_VERSION;
6643 ver.minor = MD_MINOR_VERSION;
6644 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6646 if (copy_to_user(arg, &ver, sizeof(ver)))
6652 static int get_array_info(struct mddev *mddev, void __user *arg)
6654 mdu_array_info_t info;
6655 int nr,working,insync,failed,spare;
6656 struct md_rdev *rdev;
6658 nr = working = insync = failed = spare = 0;
6660 rdev_for_each_rcu(rdev, mddev) {
6662 if (test_bit(Faulty, &rdev->flags))
6666 if (test_bit(In_sync, &rdev->flags))
6668 else if (test_bit(Journal, &rdev->flags))
6669 /* TODO: add journal count to md_u.h */
6677 info.major_version = mddev->major_version;
6678 info.minor_version = mddev->minor_version;
6679 info.patch_version = MD_PATCHLEVEL_VERSION;
6680 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6681 info.level = mddev->level;
6682 info.size = mddev->dev_sectors / 2;
6683 if (info.size != mddev->dev_sectors / 2) /* overflow */
6686 info.raid_disks = mddev->raid_disks;
6687 info.md_minor = mddev->md_minor;
6688 info.not_persistent= !mddev->persistent;
6690 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6693 info.state = (1<<MD_SB_CLEAN);
6694 if (mddev->bitmap && mddev->bitmap_info.offset)
6695 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6696 if (mddev_is_clustered(mddev))
6697 info.state |= (1<<MD_SB_CLUSTERED);
6698 info.active_disks = insync;
6699 info.working_disks = working;
6700 info.failed_disks = failed;
6701 info.spare_disks = spare;
6703 info.layout = mddev->layout;
6704 info.chunk_size = mddev->chunk_sectors << 9;
6706 if (copy_to_user(arg, &info, sizeof(info)))
6712 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6714 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6718 file = kzalloc(sizeof(*file), GFP_NOIO);
6723 spin_lock(&mddev->lock);
6724 /* bitmap enabled */
6725 if (mddev->bitmap_info.file) {
6726 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6727 sizeof(file->pathname));
6731 memmove(file->pathname, ptr,
6732 sizeof(file->pathname)-(ptr-file->pathname));
6734 spin_unlock(&mddev->lock);
6737 copy_to_user(arg, file, sizeof(*file)))
6744 static int get_disk_info(struct mddev *mddev, void __user * arg)
6746 mdu_disk_info_t info;
6747 struct md_rdev *rdev;
6749 if (copy_from_user(&info, arg, sizeof(info)))
6753 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6755 info.major = MAJOR(rdev->bdev->bd_dev);
6756 info.minor = MINOR(rdev->bdev->bd_dev);
6757 info.raid_disk = rdev->raid_disk;
6759 if (test_bit(Faulty, &rdev->flags))
6760 info.state |= (1<<MD_DISK_FAULTY);
6761 else if (test_bit(In_sync, &rdev->flags)) {
6762 info.state |= (1<<MD_DISK_ACTIVE);
6763 info.state |= (1<<MD_DISK_SYNC);
6765 if (test_bit(Journal, &rdev->flags))
6766 info.state |= (1<<MD_DISK_JOURNAL);
6767 if (test_bit(WriteMostly, &rdev->flags))
6768 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6769 if (test_bit(FailFast, &rdev->flags))
6770 info.state |= (1<<MD_DISK_FAILFAST);
6772 info.major = info.minor = 0;
6773 info.raid_disk = -1;
6774 info.state = (1<<MD_DISK_REMOVED);
6778 if (copy_to_user(arg, &info, sizeof(info)))
6784 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6786 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6787 struct md_rdev *rdev;
6788 dev_t dev = MKDEV(info->major,info->minor);
6790 if (mddev_is_clustered(mddev) &&
6791 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6792 pr_warn("%s: Cannot add to clustered mddev.\n",
6797 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6800 if (!mddev->raid_disks) {
6802 /* expecting a device which has a superblock */
6803 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6805 pr_warn("md: md_import_device returned %ld\n",
6807 return PTR_ERR(rdev);
6809 if (!list_empty(&mddev->disks)) {
6810 struct md_rdev *rdev0
6811 = list_entry(mddev->disks.next,
6812 struct md_rdev, same_set);
6813 err = super_types[mddev->major_version]
6814 .load_super(rdev, rdev0, mddev->minor_version);
6816 pr_warn("md: %s has different UUID to %s\n",
6817 bdevname(rdev->bdev,b),
6818 bdevname(rdev0->bdev,b2));
6823 err = bind_rdev_to_array(rdev, mddev);
6830 * md_add_new_disk can be used once the array is assembled
6831 * to add "hot spares". They must already have a superblock
6836 if (!mddev->pers->hot_add_disk) {
6837 pr_warn("%s: personality does not support diskops!\n",
6841 if (mddev->persistent)
6842 rdev = md_import_device(dev, mddev->major_version,
6843 mddev->minor_version);
6845 rdev = md_import_device(dev, -1, -1);
6847 pr_warn("md: md_import_device returned %ld\n",
6849 return PTR_ERR(rdev);
6851 /* set saved_raid_disk if appropriate */
6852 if (!mddev->persistent) {
6853 if (info->state & (1<<MD_DISK_SYNC) &&
6854 info->raid_disk < mddev->raid_disks) {
6855 rdev->raid_disk = info->raid_disk;
6856 set_bit(In_sync, &rdev->flags);
6857 clear_bit(Bitmap_sync, &rdev->flags);
6859 rdev->raid_disk = -1;
6860 rdev->saved_raid_disk = rdev->raid_disk;
6862 super_types[mddev->major_version].
6863 validate_super(mddev, NULL/*freshest*/, rdev);
6864 if ((info->state & (1<<MD_DISK_SYNC)) &&
6865 rdev->raid_disk != info->raid_disk) {
6866 /* This was a hot-add request, but events doesn't
6867 * match, so reject it.
6873 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6874 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6875 set_bit(WriteMostly, &rdev->flags);
6877 clear_bit(WriteMostly, &rdev->flags);
6878 if (info->state & (1<<MD_DISK_FAILFAST))
6879 set_bit(FailFast, &rdev->flags);
6881 clear_bit(FailFast, &rdev->flags);
6883 if (info->state & (1<<MD_DISK_JOURNAL)) {
6884 struct md_rdev *rdev2;
6885 bool has_journal = false;
6887 /* make sure no existing journal disk */
6888 rdev_for_each(rdev2, mddev) {
6889 if (test_bit(Journal, &rdev2->flags)) {
6894 if (has_journal || mddev->bitmap) {
6898 set_bit(Journal, &rdev->flags);
6901 * check whether the device shows up in other nodes
6903 if (mddev_is_clustered(mddev)) {
6904 if (info->state & (1 << MD_DISK_CANDIDATE))
6905 set_bit(Candidate, &rdev->flags);
6906 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6907 /* --add initiated by this node */
6908 err = md_cluster_ops->add_new_disk(mddev, rdev);
6916 rdev->raid_disk = -1;
6917 err = bind_rdev_to_array(rdev, mddev);
6922 if (mddev_is_clustered(mddev)) {
6923 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6925 err = md_cluster_ops->new_disk_ack(mddev,
6928 md_kick_rdev_from_array(rdev);
6932 md_cluster_ops->add_new_disk_cancel(mddev);
6934 err = add_bound_rdev(rdev);
6938 err = add_bound_rdev(rdev);
6943 /* otherwise, md_add_new_disk is only allowed
6944 * for major_version==0 superblocks
6946 if (mddev->major_version != 0) {
6947 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6951 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6953 rdev = md_import_device(dev, -1, 0);
6955 pr_warn("md: error, md_import_device() returned %ld\n",
6957 return PTR_ERR(rdev);
6959 rdev->desc_nr = info->number;
6960 if (info->raid_disk < mddev->raid_disks)
6961 rdev->raid_disk = info->raid_disk;
6963 rdev->raid_disk = -1;
6965 if (rdev->raid_disk < mddev->raid_disks)
6966 if (info->state & (1<<MD_DISK_SYNC))
6967 set_bit(In_sync, &rdev->flags);
6969 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6970 set_bit(WriteMostly, &rdev->flags);
6971 if (info->state & (1<<MD_DISK_FAILFAST))
6972 set_bit(FailFast, &rdev->flags);
6974 if (!mddev->persistent) {
6975 pr_debug("md: nonpersistent superblock ...\n");
6976 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6978 rdev->sb_start = calc_dev_sboffset(rdev);
6979 rdev->sectors = rdev->sb_start;
6981 err = bind_rdev_to_array(rdev, mddev);
6991 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6993 char b[BDEVNAME_SIZE];
6994 struct md_rdev *rdev;
6999 rdev = find_rdev(mddev, dev);
7003 if (rdev->raid_disk < 0)
7006 clear_bit(Blocked, &rdev->flags);
7007 remove_and_add_spares(mddev, rdev);
7009 if (rdev->raid_disk >= 0)
7013 if (mddev_is_clustered(mddev)) {
7014 if (md_cluster_ops->remove_disk(mddev, rdev))
7018 md_kick_rdev_from_array(rdev);
7019 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7021 md_wakeup_thread(mddev->thread);
7023 md_update_sb(mddev, 1);
7024 md_new_event(mddev);
7028 pr_debug("md: cannot remove active disk %s from %s ...\n",
7029 bdevname(rdev->bdev,b), mdname(mddev));
7033 static int hot_add_disk(struct mddev *mddev, dev_t dev)
7035 char b[BDEVNAME_SIZE];
7037 struct md_rdev *rdev;
7042 if (mddev->major_version != 0) {
7043 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
7047 if (!mddev->pers->hot_add_disk) {
7048 pr_warn("%s: personality does not support diskops!\n",
7053 rdev = md_import_device(dev, -1, 0);
7055 pr_warn("md: error, md_import_device() returned %ld\n",
7060 if (mddev->persistent)
7061 rdev->sb_start = calc_dev_sboffset(rdev);
7063 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
7065 rdev->sectors = rdev->sb_start;
7067 if (test_bit(Faulty, &rdev->flags)) {
7068 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
7069 bdevname(rdev->bdev,b), mdname(mddev));
7074 clear_bit(In_sync, &rdev->flags);
7076 rdev->saved_raid_disk = -1;
7077 err = bind_rdev_to_array(rdev, mddev);
7082 * The rest should better be atomic, we can have disk failures
7083 * noticed in interrupt contexts ...
7086 rdev->raid_disk = -1;
7088 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7090 md_update_sb(mddev, 1);
7092 * Kick recovery, maybe this spare has to be added to the
7093 * array immediately.
7095 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7096 md_wakeup_thread(mddev->thread);
7097 md_new_event(mddev);
7105 static int set_bitmap_file(struct mddev *mddev, int fd)
7110 if (!mddev->pers->quiesce || !mddev->thread)
7112 if (mddev->recovery || mddev->sync_thread)
7114 /* we should be able to change the bitmap.. */
7118 struct inode *inode;
7121 if (mddev->bitmap || mddev->bitmap_info.file)
7122 return -EEXIST; /* cannot add when bitmap is present */
7126 pr_warn("%s: error: failed to get bitmap file\n",
7131 inode = f->f_mapping->host;
7132 if (!S_ISREG(inode->i_mode)) {
7133 pr_warn("%s: error: bitmap file must be a regular file\n",
7136 } else if (!(f->f_mode & FMODE_WRITE)) {
7137 pr_warn("%s: error: bitmap file must open for write\n",
7140 } else if (atomic_read(&inode->i_writecount) != 1) {
7141 pr_warn("%s: error: bitmap file is already in use\n",
7149 mddev->bitmap_info.file = f;
7150 mddev->bitmap_info.offset = 0; /* file overrides offset */
7151 } else if (mddev->bitmap == NULL)
7152 return -ENOENT; /* cannot remove what isn't there */
7156 struct bitmap *bitmap;
7158 bitmap = md_bitmap_create(mddev, -1);
7159 mddev_suspend(mddev);
7160 if (!IS_ERR(bitmap)) {
7161 mddev->bitmap = bitmap;
7162 err = md_bitmap_load(mddev);
7164 err = PTR_ERR(bitmap);
7166 md_bitmap_destroy(mddev);
7169 mddev_resume(mddev);
7170 } else if (fd < 0) {
7171 mddev_suspend(mddev);
7172 md_bitmap_destroy(mddev);
7173 mddev_resume(mddev);
7177 struct file *f = mddev->bitmap_info.file;
7179 spin_lock(&mddev->lock);
7180 mddev->bitmap_info.file = NULL;
7181 spin_unlock(&mddev->lock);
7190 * md_set_array_info is used two different ways
7191 * The original usage is when creating a new array.
7192 * In this usage, raid_disks is > 0 and it together with
7193 * level, size, not_persistent,layout,chunksize determine the
7194 * shape of the array.
7195 * This will always create an array with a type-0.90.0 superblock.
7196 * The newer usage is when assembling an array.
7197 * In this case raid_disks will be 0, and the major_version field is
7198 * use to determine which style super-blocks are to be found on the devices.
7199 * The minor and patch _version numbers are also kept incase the
7200 * super_block handler wishes to interpret them.
7202 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7204 if (info->raid_disks == 0) {
7205 /* just setting version number for superblock loading */
7206 if (info->major_version < 0 ||
7207 info->major_version >= ARRAY_SIZE(super_types) ||
7208 super_types[info->major_version].name == NULL) {
7209 /* maybe try to auto-load a module? */
7210 pr_warn("md: superblock version %d not known\n",
7211 info->major_version);
7214 mddev->major_version = info->major_version;
7215 mddev->minor_version = info->minor_version;
7216 mddev->patch_version = info->patch_version;
7217 mddev->persistent = !info->not_persistent;
7218 /* ensure mddev_put doesn't delete this now that there
7219 * is some minimal configuration.
7221 mddev->ctime = ktime_get_real_seconds();
7224 mddev->major_version = MD_MAJOR_VERSION;
7225 mddev->minor_version = MD_MINOR_VERSION;
7226 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7227 mddev->ctime = ktime_get_real_seconds();
7229 mddev->level = info->level;
7230 mddev->clevel[0] = 0;
7231 mddev->dev_sectors = 2 * (sector_t)info->size;
7232 mddev->raid_disks = info->raid_disks;
7233 /* don't set md_minor, it is determined by which /dev/md* was
7236 if (info->state & (1<<MD_SB_CLEAN))
7237 mddev->recovery_cp = MaxSector;
7239 mddev->recovery_cp = 0;
7240 mddev->persistent = ! info->not_persistent;
7241 mddev->external = 0;
7243 mddev->layout = info->layout;
7244 if (mddev->level == 0)
7245 /* Cannot trust RAID0 layout info here */
7247 mddev->chunk_sectors = info->chunk_size >> 9;
7249 if (mddev->persistent) {
7250 mddev->max_disks = MD_SB_DISKS;
7252 mddev->sb_flags = 0;
7254 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7256 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7257 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7258 mddev->bitmap_info.offset = 0;
7260 mddev->reshape_position = MaxSector;
7263 * Generate a 128 bit UUID
7265 get_random_bytes(mddev->uuid, 16);
7267 mddev->new_level = mddev->level;
7268 mddev->new_chunk_sectors = mddev->chunk_sectors;
7269 mddev->new_layout = mddev->layout;
7270 mddev->delta_disks = 0;
7271 mddev->reshape_backwards = 0;
7276 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7278 lockdep_assert_held(&mddev->reconfig_mutex);
7280 if (mddev->external_size)
7283 mddev->array_sectors = array_sectors;
7285 EXPORT_SYMBOL(md_set_array_sectors);
7287 static int update_size(struct mddev *mddev, sector_t num_sectors)
7289 struct md_rdev *rdev;
7291 int fit = (num_sectors == 0);
7292 sector_t old_dev_sectors = mddev->dev_sectors;
7294 if (mddev->pers->resize == NULL)
7296 /* The "num_sectors" is the number of sectors of each device that
7297 * is used. This can only make sense for arrays with redundancy.
7298 * linear and raid0 always use whatever space is available. We can only
7299 * consider changing this number if no resync or reconstruction is
7300 * happening, and if the new size is acceptable. It must fit before the
7301 * sb_start or, if that is <data_offset, it must fit before the size
7302 * of each device. If num_sectors is zero, we find the largest size
7305 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7311 rdev_for_each(rdev, mddev) {
7312 sector_t avail = rdev->sectors;
7314 if (fit && (num_sectors == 0 || num_sectors > avail))
7315 num_sectors = avail;
7316 if (avail < num_sectors)
7319 rv = mddev->pers->resize(mddev, num_sectors);
7321 if (mddev_is_clustered(mddev))
7322 md_cluster_ops->update_size(mddev, old_dev_sectors);
7323 else if (mddev->queue) {
7324 set_capacity(mddev->gendisk, mddev->array_sectors);
7325 revalidate_disk_size(mddev->gendisk, true);
7331 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7334 struct md_rdev *rdev;
7335 /* change the number of raid disks */
7336 if (mddev->pers->check_reshape == NULL)
7340 if (raid_disks <= 0 ||
7341 (mddev->max_disks && raid_disks >= mddev->max_disks))
7343 if (mddev->sync_thread ||
7344 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7345 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7346 mddev->reshape_position != MaxSector)
7349 rdev_for_each(rdev, mddev) {
7350 if (mddev->raid_disks < raid_disks &&
7351 rdev->data_offset < rdev->new_data_offset)
7353 if (mddev->raid_disks > raid_disks &&
7354 rdev->data_offset > rdev->new_data_offset)
7358 mddev->delta_disks = raid_disks - mddev->raid_disks;
7359 if (mddev->delta_disks < 0)
7360 mddev->reshape_backwards = 1;
7361 else if (mddev->delta_disks > 0)
7362 mddev->reshape_backwards = 0;
7364 rv = mddev->pers->check_reshape(mddev);
7366 mddev->delta_disks = 0;
7367 mddev->reshape_backwards = 0;
7373 * update_array_info is used to change the configuration of an
7375 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7376 * fields in the info are checked against the array.
7377 * Any differences that cannot be handled will cause an error.
7378 * Normally, only one change can be managed at a time.
7380 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7386 /* calculate expected state,ignoring low bits */
7387 if (mddev->bitmap && mddev->bitmap_info.offset)
7388 state |= (1 << MD_SB_BITMAP_PRESENT);
7390 if (mddev->major_version != info->major_version ||
7391 mddev->minor_version != info->minor_version ||
7392 /* mddev->patch_version != info->patch_version || */
7393 mddev->ctime != info->ctime ||
7394 mddev->level != info->level ||
7395 /* mddev->layout != info->layout || */
7396 mddev->persistent != !info->not_persistent ||
7397 mddev->chunk_sectors != info->chunk_size >> 9 ||
7398 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7399 ((state^info->state) & 0xfffffe00)
7402 /* Check there is only one change */
7403 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7405 if (mddev->raid_disks != info->raid_disks)
7407 if (mddev->layout != info->layout)
7409 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7416 if (mddev->layout != info->layout) {
7418 * we don't need to do anything at the md level, the
7419 * personality will take care of it all.
7421 if (mddev->pers->check_reshape == NULL)
7424 mddev->new_layout = info->layout;
7425 rv = mddev->pers->check_reshape(mddev);
7427 mddev->new_layout = mddev->layout;
7431 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7432 rv = update_size(mddev, (sector_t)info->size * 2);
7434 if (mddev->raid_disks != info->raid_disks)
7435 rv = update_raid_disks(mddev, info->raid_disks);
7437 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7438 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7442 if (mddev->recovery || mddev->sync_thread) {
7446 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7447 struct bitmap *bitmap;
7448 /* add the bitmap */
7449 if (mddev->bitmap) {
7453 if (mddev->bitmap_info.default_offset == 0) {
7457 mddev->bitmap_info.offset =
7458 mddev->bitmap_info.default_offset;
7459 mddev->bitmap_info.space =
7460 mddev->bitmap_info.default_space;
7461 bitmap = md_bitmap_create(mddev, -1);
7462 mddev_suspend(mddev);
7463 if (!IS_ERR(bitmap)) {
7464 mddev->bitmap = bitmap;
7465 rv = md_bitmap_load(mddev);
7467 rv = PTR_ERR(bitmap);
7469 md_bitmap_destroy(mddev);
7470 mddev_resume(mddev);
7472 /* remove the bitmap */
7473 if (!mddev->bitmap) {
7477 if (mddev->bitmap->storage.file) {
7481 if (mddev->bitmap_info.nodes) {
7482 /* hold PW on all the bitmap lock */
7483 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7484 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7486 md_cluster_ops->unlock_all_bitmaps(mddev);
7490 mddev->bitmap_info.nodes = 0;
7491 md_cluster_ops->leave(mddev);
7492 module_put(md_cluster_mod);
7493 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7495 mddev_suspend(mddev);
7496 md_bitmap_destroy(mddev);
7497 mddev_resume(mddev);
7498 mddev->bitmap_info.offset = 0;
7501 md_update_sb(mddev, 1);
7507 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7509 struct md_rdev *rdev;
7512 if (mddev->pers == NULL)
7516 rdev = md_find_rdev_rcu(mddev, dev);
7520 md_error(mddev, rdev);
7521 if (!test_bit(Faulty, &rdev->flags))
7529 * We have a problem here : there is no easy way to give a CHS
7530 * virtual geometry. We currently pretend that we have a 2 heads
7531 * 4 sectors (with a BIG number of cylinders...). This drives
7532 * dosfs just mad... ;-)
7534 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7536 struct mddev *mddev = bdev->bd_disk->private_data;
7540 geo->cylinders = mddev->array_sectors / 8;
7544 static inline bool md_ioctl_valid(unsigned int cmd)
7548 case GET_ARRAY_INFO:
7549 case GET_BITMAP_FILE:
7552 case HOT_REMOVE_DISK:
7554 case RESTART_ARRAY_RW:
7556 case SET_ARRAY_INFO:
7557 case SET_BITMAP_FILE:
7558 case SET_DISK_FAULTY:
7561 case CLUSTERED_DISK_NACK:
7568 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7569 unsigned int cmd, unsigned long arg)
7572 void __user *argp = (void __user *)arg;
7573 struct mddev *mddev = NULL;
7575 if (!md_ioctl_valid(cmd))
7580 case GET_ARRAY_INFO:
7584 if (!capable(CAP_SYS_ADMIN))
7589 * Commands dealing with the RAID driver but not any
7594 err = get_version(argp);
7600 * Commands creating/starting a new array:
7603 mddev = bdev->bd_disk->private_data;
7610 /* Some actions do not requires the mutex */
7612 case GET_ARRAY_INFO:
7613 if (!mddev->raid_disks && !mddev->external)
7616 err = get_array_info(mddev, argp);
7620 if (!mddev->raid_disks && !mddev->external)
7623 err = get_disk_info(mddev, argp);
7626 case SET_DISK_FAULTY:
7627 err = set_disk_faulty(mddev, new_decode_dev(arg));
7630 case GET_BITMAP_FILE:
7631 err = get_bitmap_file(mddev, argp);
7636 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7637 flush_rdev_wq(mddev);
7639 if (cmd == HOT_REMOVE_DISK)
7640 /* need to ensure recovery thread has run */
7641 wait_event_interruptible_timeout(mddev->sb_wait,
7642 !test_bit(MD_RECOVERY_NEEDED,
7644 msecs_to_jiffies(5000));
7645 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7646 /* Need to flush page cache, and ensure no-one else opens
7649 mutex_lock(&mddev->open_mutex);
7650 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7651 mutex_unlock(&mddev->open_mutex);
7655 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7656 mutex_unlock(&mddev->open_mutex);
7660 mutex_unlock(&mddev->open_mutex);
7661 sync_blockdev(bdev);
7663 err = mddev_lock(mddev);
7665 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7670 if (cmd == SET_ARRAY_INFO) {
7671 mdu_array_info_t info;
7673 memset(&info, 0, sizeof(info));
7674 else if (copy_from_user(&info, argp, sizeof(info))) {
7679 err = update_array_info(mddev, &info);
7681 pr_warn("md: couldn't update array info. %d\n", err);
7686 if (!list_empty(&mddev->disks)) {
7687 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7691 if (mddev->raid_disks) {
7692 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7696 err = md_set_array_info(mddev, &info);
7698 pr_warn("md: couldn't set array info. %d\n", err);
7705 * Commands querying/configuring an existing array:
7707 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7708 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7709 if ((!mddev->raid_disks && !mddev->external)
7710 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7711 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7712 && cmd != GET_BITMAP_FILE) {
7718 * Commands even a read-only array can execute:
7721 case RESTART_ARRAY_RW:
7722 err = restart_array(mddev);
7726 err = do_md_stop(mddev, 0, bdev);
7730 err = md_set_readonly(mddev, bdev);
7733 case HOT_REMOVE_DISK:
7734 err = hot_remove_disk(mddev, new_decode_dev(arg));
7738 /* We can support ADD_NEW_DISK on read-only arrays
7739 * only if we are re-adding a preexisting device.
7740 * So require mddev->pers and MD_DISK_SYNC.
7743 mdu_disk_info_t info;
7744 if (copy_from_user(&info, argp, sizeof(info)))
7746 else if (!(info.state & (1<<MD_DISK_SYNC)))
7747 /* Need to clear read-only for this */
7750 err = md_add_new_disk(mddev, &info);
7757 * The remaining ioctls are changing the state of the
7758 * superblock, so we do not allow them on read-only arrays.
7760 if (mddev->ro && mddev->pers) {
7761 if (mddev->ro == 2) {
7763 sysfs_notify_dirent_safe(mddev->sysfs_state);
7764 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7765 /* mddev_unlock will wake thread */
7766 /* If a device failed while we were read-only, we
7767 * need to make sure the metadata is updated now.
7769 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7770 mddev_unlock(mddev);
7771 wait_event(mddev->sb_wait,
7772 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7773 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7774 mddev_lock_nointr(mddev);
7785 mdu_disk_info_t info;
7786 if (copy_from_user(&info, argp, sizeof(info)))
7789 err = md_add_new_disk(mddev, &info);
7793 case CLUSTERED_DISK_NACK:
7794 if (mddev_is_clustered(mddev))
7795 md_cluster_ops->new_disk_ack(mddev, false);
7801 err = hot_add_disk(mddev, new_decode_dev(arg));
7805 err = do_md_run(mddev);
7808 case SET_BITMAP_FILE:
7809 err = set_bitmap_file(mddev, (int)arg);
7818 if (mddev->hold_active == UNTIL_IOCTL &&
7820 mddev->hold_active = 0;
7821 mddev_unlock(mddev);
7823 if (cmd == STOP_ARRAY_RO || (err && cmd == STOP_ARRAY))
7824 clear_bit(MD_CLOSING, &mddev->flags);
7827 #ifdef CONFIG_COMPAT
7828 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7829 unsigned int cmd, unsigned long arg)
7832 case HOT_REMOVE_DISK:
7834 case SET_DISK_FAULTY:
7835 case SET_BITMAP_FILE:
7836 /* These take in integer arg, do not convert */
7839 arg = (unsigned long)compat_ptr(arg);
7843 return md_ioctl(bdev, mode, cmd, arg);
7845 #endif /* CONFIG_COMPAT */
7847 static int md_set_read_only(struct block_device *bdev, bool ro)
7849 struct mddev *mddev = bdev->bd_disk->private_data;
7852 err = mddev_lock(mddev);
7856 if (!mddev->raid_disks && !mddev->external) {
7862 * Transitioning to read-auto need only happen for arrays that call
7863 * md_write_start and which are not ready for writes yet.
7865 if (!ro && mddev->ro == 1 && mddev->pers) {
7866 err = restart_array(mddev);
7873 mddev_unlock(mddev);
7877 static int md_open(struct block_device *bdev, fmode_t mode)
7880 * Succeed if we can lock the mddev, which confirms that
7881 * it isn't being stopped right now.
7883 struct mddev *mddev = mddev_find(bdev->bd_dev);
7889 if (mddev->gendisk != bdev->bd_disk) {
7890 /* we are racing with mddev_put which is discarding this
7894 /* Wait until bdev->bd_disk is definitely gone */
7895 if (work_pending(&mddev->del_work))
7896 flush_workqueue(md_misc_wq);
7899 BUG_ON(mddev != bdev->bd_disk->private_data);
7901 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7904 if (test_bit(MD_CLOSING, &mddev->flags)) {
7905 mutex_unlock(&mddev->open_mutex);
7911 atomic_inc(&mddev->openers);
7912 mutex_unlock(&mddev->open_mutex);
7914 bdev_check_media_change(bdev);
7921 static void md_release(struct gendisk *disk, fmode_t mode)
7923 struct mddev *mddev = disk->private_data;
7926 atomic_dec(&mddev->openers);
7930 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7932 struct mddev *mddev = disk->private_data;
7933 unsigned int ret = 0;
7936 ret = DISK_EVENT_MEDIA_CHANGE;
7941 const struct block_device_operations md_fops =
7943 .owner = THIS_MODULE,
7944 .submit_bio = md_submit_bio,
7946 .release = md_release,
7948 #ifdef CONFIG_COMPAT
7949 .compat_ioctl = md_compat_ioctl,
7951 .getgeo = md_getgeo,
7952 .check_events = md_check_events,
7953 .set_read_only = md_set_read_only,
7956 static int md_thread(void *arg)
7958 struct md_thread *thread = arg;
7961 * md_thread is a 'system-thread', it's priority should be very
7962 * high. We avoid resource deadlocks individually in each
7963 * raid personality. (RAID5 does preallocation) We also use RR and
7964 * the very same RT priority as kswapd, thus we will never get
7965 * into a priority inversion deadlock.
7967 * we definitely have to have equal or higher priority than
7968 * bdflush, otherwise bdflush will deadlock if there are too
7969 * many dirty RAID5 blocks.
7972 allow_signal(SIGKILL);
7973 while (!kthread_should_stop()) {
7975 /* We need to wait INTERRUPTIBLE so that
7976 * we don't add to the load-average.
7977 * That means we need to be sure no signals are
7980 if (signal_pending(current))
7981 flush_signals(current);
7983 wait_event_interruptible_timeout
7985 test_bit(THREAD_WAKEUP, &thread->flags)
7986 || kthread_should_stop() || kthread_should_park(),
7989 clear_bit(THREAD_WAKEUP, &thread->flags);
7990 if (kthread_should_park())
7992 if (!kthread_should_stop())
7993 thread->run(thread);
7999 void md_wakeup_thread(struct md_thread *thread)
8002 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
8003 set_bit(THREAD_WAKEUP, &thread->flags);
8004 wake_up(&thread->wqueue);
8007 EXPORT_SYMBOL(md_wakeup_thread);
8009 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
8010 struct mddev *mddev, const char *name)
8012 struct md_thread *thread;
8014 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
8018 init_waitqueue_head(&thread->wqueue);
8021 thread->mddev = mddev;
8022 thread->timeout = MAX_SCHEDULE_TIMEOUT;
8023 thread->tsk = kthread_run(md_thread, thread,
8025 mdname(thread->mddev),
8027 if (IS_ERR(thread->tsk)) {
8033 EXPORT_SYMBOL(md_register_thread);
8035 void md_unregister_thread(struct md_thread **threadp)
8037 struct md_thread *thread;
8040 * Locking ensures that mddev_unlock does not wake_up a
8041 * non-existent thread
8043 spin_lock(&pers_lock);
8046 spin_unlock(&pers_lock);
8050 spin_unlock(&pers_lock);
8052 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
8053 kthread_stop(thread->tsk);
8056 EXPORT_SYMBOL(md_unregister_thread);
8058 void md_error(struct mddev *mddev, struct md_rdev *rdev)
8060 if (!rdev || test_bit(Faulty, &rdev->flags))
8063 if (!mddev->pers || !mddev->pers->error_handler)
8065 mddev->pers->error_handler(mddev,rdev);
8066 if (mddev->degraded)
8067 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8068 sysfs_notify_dirent_safe(rdev->sysfs_state);
8069 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8070 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8071 md_wakeup_thread(mddev->thread);
8072 if (mddev->event_work.func)
8073 queue_work(md_misc_wq, &mddev->event_work);
8074 md_new_event(mddev);
8076 EXPORT_SYMBOL(md_error);
8078 /* seq_file implementation /proc/mdstat */
8080 static void status_unused(struct seq_file *seq)
8083 struct md_rdev *rdev;
8085 seq_printf(seq, "unused devices: ");
8087 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8088 char b[BDEVNAME_SIZE];
8090 seq_printf(seq, "%s ",
8091 bdevname(rdev->bdev,b));
8094 seq_printf(seq, "<none>");
8096 seq_printf(seq, "\n");
8099 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8101 sector_t max_sectors, resync, res;
8102 unsigned long dt, db = 0;
8103 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8104 int scale, recovery_active;
8105 unsigned int per_milli;
8107 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8108 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8109 max_sectors = mddev->resync_max_sectors;
8111 max_sectors = mddev->dev_sectors;
8113 resync = mddev->curr_resync;
8115 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8116 /* Still cleaning up */
8117 resync = max_sectors;
8118 } else if (resync > max_sectors)
8119 resync = max_sectors;
8121 resync -= atomic_read(&mddev->recovery_active);
8124 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8125 struct md_rdev *rdev;
8127 rdev_for_each(rdev, mddev)
8128 if (rdev->raid_disk >= 0 &&
8129 !test_bit(Faulty, &rdev->flags) &&
8130 rdev->recovery_offset != MaxSector &&
8131 rdev->recovery_offset) {
8132 seq_printf(seq, "\trecover=REMOTE");
8135 if (mddev->reshape_position != MaxSector)
8136 seq_printf(seq, "\treshape=REMOTE");
8138 seq_printf(seq, "\tresync=REMOTE");
8141 if (mddev->recovery_cp < MaxSector) {
8142 seq_printf(seq, "\tresync=PENDING");
8148 seq_printf(seq, "\tresync=DELAYED");
8152 WARN_ON(max_sectors == 0);
8153 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8154 * in a sector_t, and (max_sectors>>scale) will fit in a
8155 * u32, as those are the requirements for sector_div.
8156 * Thus 'scale' must be at least 10
8159 if (sizeof(sector_t) > sizeof(unsigned long)) {
8160 while ( max_sectors/2 > (1ULL<<(scale+32)))
8163 res = (resync>>scale)*1000;
8164 sector_div(res, (u32)((max_sectors>>scale)+1));
8168 int i, x = per_milli/50, y = 20-x;
8169 seq_printf(seq, "[");
8170 for (i = 0; i < x; i++)
8171 seq_printf(seq, "=");
8172 seq_printf(seq, ">");
8173 for (i = 0; i < y; i++)
8174 seq_printf(seq, ".");
8175 seq_printf(seq, "] ");
8177 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8178 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8180 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8182 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8183 "resync" : "recovery"))),
8184 per_milli/10, per_milli % 10,
8185 (unsigned long long) resync/2,
8186 (unsigned long long) max_sectors/2);
8189 * dt: time from mark until now
8190 * db: blocks written from mark until now
8191 * rt: remaining time
8193 * rt is a sector_t, which is always 64bit now. We are keeping
8194 * the original algorithm, but it is not really necessary.
8196 * Original algorithm:
8197 * So we divide before multiply in case it is 32bit and close
8199 * We scale the divisor (db) by 32 to avoid losing precision
8200 * near the end of resync when the number of remaining sectors
8202 * We then divide rt by 32 after multiplying by db to compensate.
8203 * The '+1' avoids division by zero if db is very small.
8205 dt = ((jiffies - mddev->resync_mark) / HZ);
8208 curr_mark_cnt = mddev->curr_mark_cnt;
8209 recovery_active = atomic_read(&mddev->recovery_active);
8210 resync_mark_cnt = mddev->resync_mark_cnt;
8212 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8213 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8215 rt = max_sectors - resync; /* number of remaining sectors */
8216 rt = div64_u64(rt, db/32+1);
8220 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8221 ((unsigned long)rt % 60)/6);
8223 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8227 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8229 struct list_head *tmp;
8231 struct mddev *mddev;
8243 spin_lock(&all_mddevs_lock);
8244 list_for_each(tmp,&all_mddevs)
8246 mddev = list_entry(tmp, struct mddev, all_mddevs);
8248 spin_unlock(&all_mddevs_lock);
8251 spin_unlock(&all_mddevs_lock);
8253 return (void*)2;/* tail */
8257 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8259 struct list_head *tmp;
8260 struct mddev *next_mddev, *mddev = v;
8266 spin_lock(&all_mddevs_lock);
8268 tmp = all_mddevs.next;
8270 tmp = mddev->all_mddevs.next;
8271 if (tmp != &all_mddevs)
8272 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8274 next_mddev = (void*)2;
8277 spin_unlock(&all_mddevs_lock);
8285 static void md_seq_stop(struct seq_file *seq, void *v)
8287 struct mddev *mddev = v;
8289 if (mddev && v != (void*)1 && v != (void*)2)
8293 static int md_seq_show(struct seq_file *seq, void *v)
8295 struct mddev *mddev = v;
8297 struct md_rdev *rdev;
8299 if (v == (void*)1) {
8300 struct md_personality *pers;
8301 seq_printf(seq, "Personalities : ");
8302 spin_lock(&pers_lock);
8303 list_for_each_entry(pers, &pers_list, list)
8304 seq_printf(seq, "[%s] ", pers->name);
8306 spin_unlock(&pers_lock);
8307 seq_printf(seq, "\n");
8308 seq->poll_event = atomic_read(&md_event_count);
8311 if (v == (void*)2) {
8316 spin_lock(&mddev->lock);
8317 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8318 seq_printf(seq, "%s : %sactive", mdname(mddev),
8319 mddev->pers ? "" : "in");
8322 seq_printf(seq, " (read-only)");
8324 seq_printf(seq, " (auto-read-only)");
8325 seq_printf(seq, " %s", mddev->pers->name);
8330 rdev_for_each_rcu(rdev, mddev) {
8331 char b[BDEVNAME_SIZE];
8332 seq_printf(seq, " %s[%d]",
8333 bdevname(rdev->bdev,b), rdev->desc_nr);
8334 if (test_bit(WriteMostly, &rdev->flags))
8335 seq_printf(seq, "(W)");
8336 if (test_bit(Journal, &rdev->flags))
8337 seq_printf(seq, "(J)");
8338 if (test_bit(Faulty, &rdev->flags)) {
8339 seq_printf(seq, "(F)");
8342 if (rdev->raid_disk < 0)
8343 seq_printf(seq, "(S)"); /* spare */
8344 if (test_bit(Replacement, &rdev->flags))
8345 seq_printf(seq, "(R)");
8346 sectors += rdev->sectors;
8350 if (!list_empty(&mddev->disks)) {
8352 seq_printf(seq, "\n %llu blocks",
8353 (unsigned long long)
8354 mddev->array_sectors / 2);
8356 seq_printf(seq, "\n %llu blocks",
8357 (unsigned long long)sectors / 2);
8359 if (mddev->persistent) {
8360 if (mddev->major_version != 0 ||
8361 mddev->minor_version != 90) {
8362 seq_printf(seq," super %d.%d",
8363 mddev->major_version,
8364 mddev->minor_version);
8366 } else if (mddev->external)
8367 seq_printf(seq, " super external:%s",
8368 mddev->metadata_type);
8370 seq_printf(seq, " super non-persistent");
8373 mddev->pers->status(seq, mddev);
8374 seq_printf(seq, "\n ");
8375 if (mddev->pers->sync_request) {
8376 if (status_resync(seq, mddev))
8377 seq_printf(seq, "\n ");
8380 seq_printf(seq, "\n ");
8382 md_bitmap_status(seq, mddev->bitmap);
8384 seq_printf(seq, "\n");
8386 spin_unlock(&mddev->lock);
8391 static const struct seq_operations md_seq_ops = {
8392 .start = md_seq_start,
8393 .next = md_seq_next,
8394 .stop = md_seq_stop,
8395 .show = md_seq_show,
8398 static int md_seq_open(struct inode *inode, struct file *file)
8400 struct seq_file *seq;
8403 error = seq_open(file, &md_seq_ops);
8407 seq = file->private_data;
8408 seq->poll_event = atomic_read(&md_event_count);
8412 static int md_unloading;
8413 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8415 struct seq_file *seq = filp->private_data;
8419 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8420 poll_wait(filp, &md_event_waiters, wait);
8422 /* always allow read */
8423 mask = EPOLLIN | EPOLLRDNORM;
8425 if (seq->poll_event != atomic_read(&md_event_count))
8426 mask |= EPOLLERR | EPOLLPRI;
8430 static const struct proc_ops mdstat_proc_ops = {
8431 .proc_open = md_seq_open,
8432 .proc_read = seq_read,
8433 .proc_lseek = seq_lseek,
8434 .proc_release = seq_release,
8435 .proc_poll = mdstat_poll,
8438 int register_md_personality(struct md_personality *p)
8440 pr_debug("md: %s personality registered for level %d\n",
8442 spin_lock(&pers_lock);
8443 list_add_tail(&p->list, &pers_list);
8444 spin_unlock(&pers_lock);
8447 EXPORT_SYMBOL(register_md_personality);
8449 int unregister_md_personality(struct md_personality *p)
8451 pr_debug("md: %s personality unregistered\n", p->name);
8452 spin_lock(&pers_lock);
8453 list_del_init(&p->list);
8454 spin_unlock(&pers_lock);
8457 EXPORT_SYMBOL(unregister_md_personality);
8459 int register_md_cluster_operations(struct md_cluster_operations *ops,
8460 struct module *module)
8463 spin_lock(&pers_lock);
8464 if (md_cluster_ops != NULL)
8467 md_cluster_ops = ops;
8468 md_cluster_mod = module;
8470 spin_unlock(&pers_lock);
8473 EXPORT_SYMBOL(register_md_cluster_operations);
8475 int unregister_md_cluster_operations(void)
8477 spin_lock(&pers_lock);
8478 md_cluster_ops = NULL;
8479 spin_unlock(&pers_lock);
8482 EXPORT_SYMBOL(unregister_md_cluster_operations);
8484 int md_setup_cluster(struct mddev *mddev, int nodes)
8487 if (!md_cluster_ops)
8488 request_module("md-cluster");
8489 spin_lock(&pers_lock);
8490 /* ensure module won't be unloaded */
8491 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8492 pr_warn("can't find md-cluster module or get it's reference.\n");
8493 spin_unlock(&pers_lock);
8496 spin_unlock(&pers_lock);
8498 ret = md_cluster_ops->join(mddev, nodes);
8500 mddev->safemode_delay = 0;
8504 void md_cluster_stop(struct mddev *mddev)
8506 if (!md_cluster_ops)
8508 md_cluster_ops->leave(mddev);
8509 module_put(md_cluster_mod);
8512 static int is_mddev_idle(struct mddev *mddev, int init)
8514 struct md_rdev *rdev;
8520 rdev_for_each_rcu(rdev, mddev) {
8521 struct gendisk *disk = rdev->bdev->bd_disk;
8522 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8523 atomic_read(&disk->sync_io);
8524 /* sync IO will cause sync_io to increase before the disk_stats
8525 * as sync_io is counted when a request starts, and
8526 * disk_stats is counted when it completes.
8527 * So resync activity will cause curr_events to be smaller than
8528 * when there was no such activity.
8529 * non-sync IO will cause disk_stat to increase without
8530 * increasing sync_io so curr_events will (eventually)
8531 * be larger than it was before. Once it becomes
8532 * substantially larger, the test below will cause
8533 * the array to appear non-idle, and resync will slow
8535 * If there is a lot of outstanding resync activity when
8536 * we set last_event to curr_events, then all that activity
8537 * completing might cause the array to appear non-idle
8538 * and resync will be slowed down even though there might
8539 * not have been non-resync activity. This will only
8540 * happen once though. 'last_events' will soon reflect
8541 * the state where there is little or no outstanding
8542 * resync requests, and further resync activity will
8543 * always make curr_events less than last_events.
8546 if (init || curr_events - rdev->last_events > 64) {
8547 rdev->last_events = curr_events;
8555 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8557 /* another "blocks" (512byte) blocks have been synced */
8558 atomic_sub(blocks, &mddev->recovery_active);
8559 wake_up(&mddev->recovery_wait);
8561 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8562 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8563 md_wakeup_thread(mddev->thread);
8564 // stop recovery, signal do_sync ....
8567 EXPORT_SYMBOL(md_done_sync);
8569 /* md_write_start(mddev, bi)
8570 * If we need to update some array metadata (e.g. 'active' flag
8571 * in superblock) before writing, schedule a superblock update
8572 * and wait for it to complete.
8573 * A return value of 'false' means that the write wasn't recorded
8574 * and cannot proceed as the array is being suspend.
8576 bool md_write_start(struct mddev *mddev, struct bio *bi)
8580 if (bio_data_dir(bi) != WRITE)
8583 BUG_ON(mddev->ro == 1);
8584 if (mddev->ro == 2) {
8585 /* need to switch to read/write */
8587 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8588 md_wakeup_thread(mddev->thread);
8589 md_wakeup_thread(mddev->sync_thread);
8593 percpu_ref_get(&mddev->writes_pending);
8594 smp_mb(); /* Match smp_mb in set_in_sync() */
8595 if (mddev->safemode == 1)
8596 mddev->safemode = 0;
8597 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8598 if (mddev->in_sync || mddev->sync_checkers) {
8599 spin_lock(&mddev->lock);
8600 if (mddev->in_sync) {
8602 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8603 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8604 md_wakeup_thread(mddev->thread);
8607 spin_unlock(&mddev->lock);
8611 sysfs_notify_dirent_safe(mddev->sysfs_state);
8612 if (!mddev->has_superblocks)
8614 wait_event(mddev->sb_wait,
8615 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8617 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8618 percpu_ref_put(&mddev->writes_pending);
8623 EXPORT_SYMBOL(md_write_start);
8625 /* md_write_inc can only be called when md_write_start() has
8626 * already been called at least once of the current request.
8627 * It increments the counter and is useful when a single request
8628 * is split into several parts. Each part causes an increment and
8629 * so needs a matching md_write_end().
8630 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8631 * a spinlocked region.
8633 void md_write_inc(struct mddev *mddev, struct bio *bi)
8635 if (bio_data_dir(bi) != WRITE)
8637 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8638 percpu_ref_get(&mddev->writes_pending);
8640 EXPORT_SYMBOL(md_write_inc);
8642 void md_write_end(struct mddev *mddev)
8644 percpu_ref_put(&mddev->writes_pending);
8646 if (mddev->safemode == 2)
8647 md_wakeup_thread(mddev->thread);
8648 else if (mddev->safemode_delay)
8649 /* The roundup() ensures this only performs locking once
8650 * every ->safemode_delay jiffies
8652 mod_timer(&mddev->safemode_timer,
8653 roundup(jiffies, mddev->safemode_delay) +
8654 mddev->safemode_delay);
8657 EXPORT_SYMBOL(md_write_end);
8659 /* md_allow_write(mddev)
8660 * Calling this ensures that the array is marked 'active' so that writes
8661 * may proceed without blocking. It is important to call this before
8662 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8663 * Must be called with mddev_lock held.
8665 void md_allow_write(struct mddev *mddev)
8671 if (!mddev->pers->sync_request)
8674 spin_lock(&mddev->lock);
8675 if (mddev->in_sync) {
8677 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8678 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8679 if (mddev->safemode_delay &&
8680 mddev->safemode == 0)
8681 mddev->safemode = 1;
8682 spin_unlock(&mddev->lock);
8683 md_update_sb(mddev, 0);
8684 sysfs_notify_dirent_safe(mddev->sysfs_state);
8685 /* wait for the dirty state to be recorded in the metadata */
8686 wait_event(mddev->sb_wait,
8687 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8689 spin_unlock(&mddev->lock);
8691 EXPORT_SYMBOL_GPL(md_allow_write);
8693 #define SYNC_MARKS 10
8694 #define SYNC_MARK_STEP (3*HZ)
8695 #define UPDATE_FREQUENCY (5*60*HZ)
8696 void md_do_sync(struct md_thread *thread)
8698 struct mddev *mddev = thread->mddev;
8699 struct mddev *mddev2;
8700 unsigned int currspeed = 0, window;
8701 sector_t max_sectors,j, io_sectors, recovery_done;
8702 unsigned long mark[SYNC_MARKS];
8703 unsigned long update_time;
8704 sector_t mark_cnt[SYNC_MARKS];
8706 struct list_head *tmp;
8707 sector_t last_check;
8709 struct md_rdev *rdev;
8710 char *desc, *action = NULL;
8711 struct blk_plug plug;
8714 /* just incase thread restarts... */
8715 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8716 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8718 if (mddev->ro) {/* never try to sync a read-only array */
8719 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8723 if (mddev_is_clustered(mddev)) {
8724 ret = md_cluster_ops->resync_start(mddev);
8728 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8729 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8730 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8731 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8732 && ((unsigned long long)mddev->curr_resync_completed
8733 < (unsigned long long)mddev->resync_max_sectors))
8737 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8738 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8739 desc = "data-check";
8741 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8742 desc = "requested-resync";
8746 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8751 mddev->last_sync_action = action ?: desc;
8753 /* we overload curr_resync somewhat here.
8754 * 0 == not engaged in resync at all
8755 * 2 == checking that there is no conflict with another sync
8756 * 1 == like 2, but have yielded to allow conflicting resync to
8758 * other == active in resync - this many blocks
8760 * Before starting a resync we must have set curr_resync to
8761 * 2, and then checked that every "conflicting" array has curr_resync
8762 * less than ours. When we find one that is the same or higher
8763 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8764 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8765 * This will mean we have to start checking from the beginning again.
8770 int mddev2_minor = -1;
8771 mddev->curr_resync = 2;
8774 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8776 for_each_mddev(mddev2, tmp) {
8777 if (mddev2 == mddev)
8779 if (!mddev->parallel_resync
8780 && mddev2->curr_resync
8781 && match_mddev_units(mddev, mddev2)) {
8783 if (mddev < mddev2 && mddev->curr_resync == 2) {
8784 /* arbitrarily yield */
8785 mddev->curr_resync = 1;
8786 wake_up(&resync_wait);
8788 if (mddev > mddev2 && mddev->curr_resync == 1)
8789 /* no need to wait here, we can wait the next
8790 * time 'round when curr_resync == 2
8793 /* We need to wait 'interruptible' so as not to
8794 * contribute to the load average, and not to
8795 * be caught by 'softlockup'
8797 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8798 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8799 mddev2->curr_resync >= mddev->curr_resync) {
8800 if (mddev2_minor != mddev2->md_minor) {
8801 mddev2_minor = mddev2->md_minor;
8802 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8803 desc, mdname(mddev),
8807 if (signal_pending(current))
8808 flush_signals(current);
8810 finish_wait(&resync_wait, &wq);
8813 finish_wait(&resync_wait, &wq);
8816 } while (mddev->curr_resync < 2);
8819 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8820 /* resync follows the size requested by the personality,
8821 * which defaults to physical size, but can be virtual size
8823 max_sectors = mddev->resync_max_sectors;
8824 atomic64_set(&mddev->resync_mismatches, 0);
8825 /* we don't use the checkpoint if there's a bitmap */
8826 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8827 j = mddev->resync_min;
8828 else if (!mddev->bitmap)
8829 j = mddev->recovery_cp;
8831 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8832 max_sectors = mddev->resync_max_sectors;
8834 * If the original node aborts reshaping then we continue the
8835 * reshaping, so set j again to avoid restart reshape from the
8838 if (mddev_is_clustered(mddev) &&
8839 mddev->reshape_position != MaxSector)
8840 j = mddev->reshape_position;
8842 /* recovery follows the physical size of devices */
8843 max_sectors = mddev->dev_sectors;
8846 rdev_for_each_rcu(rdev, mddev)
8847 if (rdev->raid_disk >= 0 &&
8848 !test_bit(Journal, &rdev->flags) &&
8849 !test_bit(Faulty, &rdev->flags) &&
8850 !test_bit(In_sync, &rdev->flags) &&
8851 rdev->recovery_offset < j)
8852 j = rdev->recovery_offset;
8855 /* If there is a bitmap, we need to make sure all
8856 * writes that started before we added a spare
8857 * complete before we start doing a recovery.
8858 * Otherwise the write might complete and (via
8859 * bitmap_endwrite) set a bit in the bitmap after the
8860 * recovery has checked that bit and skipped that
8863 if (mddev->bitmap) {
8864 mddev->pers->quiesce(mddev, 1);
8865 mddev->pers->quiesce(mddev, 0);
8869 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8870 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8871 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8872 speed_max(mddev), desc);
8874 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8877 for (m = 0; m < SYNC_MARKS; m++) {
8879 mark_cnt[m] = io_sectors;
8882 mddev->resync_mark = mark[last_mark];
8883 mddev->resync_mark_cnt = mark_cnt[last_mark];
8886 * Tune reconstruction:
8888 window = 32 * (PAGE_SIZE / 512);
8889 pr_debug("md: using %dk window, over a total of %lluk.\n",
8890 window/2, (unsigned long long)max_sectors/2);
8892 atomic_set(&mddev->recovery_active, 0);
8896 pr_debug("md: resuming %s of %s from checkpoint.\n",
8897 desc, mdname(mddev));
8898 mddev->curr_resync = j;
8900 mddev->curr_resync = 3; /* no longer delayed */
8901 mddev->curr_resync_completed = j;
8902 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8903 md_new_event(mddev);
8904 update_time = jiffies;
8906 blk_start_plug(&plug);
8907 while (j < max_sectors) {
8912 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8913 ((mddev->curr_resync > mddev->curr_resync_completed &&
8914 (mddev->curr_resync - mddev->curr_resync_completed)
8915 > (max_sectors >> 4)) ||
8916 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8917 (j - mddev->curr_resync_completed)*2
8918 >= mddev->resync_max - mddev->curr_resync_completed ||
8919 mddev->curr_resync_completed > mddev->resync_max
8921 /* time to update curr_resync_completed */
8922 wait_event(mddev->recovery_wait,
8923 atomic_read(&mddev->recovery_active) == 0);
8924 mddev->curr_resync_completed = j;
8925 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8926 j > mddev->recovery_cp)
8927 mddev->recovery_cp = j;
8928 update_time = jiffies;
8929 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8930 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8933 while (j >= mddev->resync_max &&
8934 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8935 /* As this condition is controlled by user-space,
8936 * we can block indefinitely, so use '_interruptible'
8937 * to avoid triggering warnings.
8939 flush_signals(current); /* just in case */
8940 wait_event_interruptible(mddev->recovery_wait,
8941 mddev->resync_max > j
8942 || test_bit(MD_RECOVERY_INTR,
8946 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8949 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8951 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8955 if (!skipped) { /* actual IO requested */
8956 io_sectors += sectors;
8957 atomic_add(sectors, &mddev->recovery_active);
8960 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8964 if (j > max_sectors)
8965 /* when skipping, extra large numbers can be returned. */
8968 mddev->curr_resync = j;
8969 mddev->curr_mark_cnt = io_sectors;
8970 if (last_check == 0)
8971 /* this is the earliest that rebuild will be
8972 * visible in /proc/mdstat
8974 md_new_event(mddev);
8976 if (last_check + window > io_sectors || j == max_sectors)
8979 last_check = io_sectors;
8981 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8983 int next = (last_mark+1) % SYNC_MARKS;
8985 mddev->resync_mark = mark[next];
8986 mddev->resync_mark_cnt = mark_cnt[next];
8987 mark[next] = jiffies;
8988 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8992 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8996 * this loop exits only if either when we are slower than
8997 * the 'hard' speed limit, or the system was IO-idle for
8999 * the system might be non-idle CPU-wise, but we only care
9000 * about not overloading the IO subsystem. (things like an
9001 * e2fsck being done on the RAID array should execute fast)
9005 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9006 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9007 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9009 if (currspeed > speed_min(mddev)) {
9010 if (currspeed > speed_max(mddev)) {
9014 if (!is_mddev_idle(mddev, 0)) {
9016 * Give other IO more of a chance.
9017 * The faster the devices, the less we wait.
9019 wait_event(mddev->recovery_wait,
9020 !atomic_read(&mddev->recovery_active));
9024 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9025 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9026 ? "interrupted" : "done");
9028 * this also signals 'finished resyncing' to md_stop
9030 blk_finish_plug(&plug);
9031 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9033 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9034 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9035 mddev->curr_resync > 3) {
9036 mddev->curr_resync_completed = mddev->curr_resync;
9037 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9039 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9041 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9042 mddev->curr_resync > 3) {
9043 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9044 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9045 if (mddev->curr_resync >= mddev->recovery_cp) {
9046 pr_debug("md: checkpointing %s of %s.\n",
9047 desc, mdname(mddev));
9048 if (test_bit(MD_RECOVERY_ERROR,
9050 mddev->recovery_cp =
9051 mddev->curr_resync_completed;
9053 mddev->recovery_cp =
9057 mddev->recovery_cp = MaxSector;
9059 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9060 mddev->curr_resync = MaxSector;
9061 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9062 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9064 rdev_for_each_rcu(rdev, mddev)
9065 if (rdev->raid_disk >= 0 &&
9066 mddev->delta_disks >= 0 &&
9067 !test_bit(Journal, &rdev->flags) &&
9068 !test_bit(Faulty, &rdev->flags) &&
9069 !test_bit(In_sync, &rdev->flags) &&
9070 rdev->recovery_offset < mddev->curr_resync)
9071 rdev->recovery_offset = mddev->curr_resync;
9077 /* set CHANGE_PENDING here since maybe another update is needed,
9078 * so other nodes are informed. It should be harmless for normal
9080 set_mask_bits(&mddev->sb_flags, 0,
9081 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9083 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9084 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9085 mddev->delta_disks > 0 &&
9086 mddev->pers->finish_reshape &&
9087 mddev->pers->size &&
9089 mddev_lock_nointr(mddev);
9090 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9091 mddev_unlock(mddev);
9092 if (!mddev_is_clustered(mddev)) {
9093 set_capacity(mddev->gendisk, mddev->array_sectors);
9094 revalidate_disk_size(mddev->gendisk, true);
9098 spin_lock(&mddev->lock);
9099 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9100 /* We completed so min/max setting can be forgotten if used. */
9101 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9102 mddev->resync_min = 0;
9103 mddev->resync_max = MaxSector;
9104 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9105 mddev->resync_min = mddev->curr_resync_completed;
9106 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9107 mddev->curr_resync = 0;
9108 spin_unlock(&mddev->lock);
9110 wake_up(&resync_wait);
9111 md_wakeup_thread(mddev->thread);
9114 EXPORT_SYMBOL_GPL(md_do_sync);
9116 static int remove_and_add_spares(struct mddev *mddev,
9117 struct md_rdev *this)
9119 struct md_rdev *rdev;
9122 bool remove_some = false;
9124 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9125 /* Mustn't remove devices when resync thread is running */
9128 rdev_for_each(rdev, mddev) {
9129 if ((this == NULL || rdev == this) &&
9130 rdev->raid_disk >= 0 &&
9131 !test_bit(Blocked, &rdev->flags) &&
9132 test_bit(Faulty, &rdev->flags) &&
9133 atomic_read(&rdev->nr_pending)==0) {
9134 /* Faulty non-Blocked devices with nr_pending == 0
9135 * never get nr_pending incremented,
9136 * never get Faulty cleared, and never get Blocked set.
9137 * So we can synchronize_rcu now rather than once per device
9140 set_bit(RemoveSynchronized, &rdev->flags);
9146 rdev_for_each(rdev, mddev) {
9147 if ((this == NULL || rdev == this) &&
9148 rdev->raid_disk >= 0 &&
9149 !test_bit(Blocked, &rdev->flags) &&
9150 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9151 (!test_bit(In_sync, &rdev->flags) &&
9152 !test_bit(Journal, &rdev->flags))) &&
9153 atomic_read(&rdev->nr_pending)==0)) {
9154 if (mddev->pers->hot_remove_disk(
9155 mddev, rdev) == 0) {
9156 sysfs_unlink_rdev(mddev, rdev);
9157 rdev->saved_raid_disk = rdev->raid_disk;
9158 rdev->raid_disk = -1;
9162 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9163 clear_bit(RemoveSynchronized, &rdev->flags);
9166 if (removed && mddev->kobj.sd)
9167 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9169 if (this && removed)
9172 rdev_for_each(rdev, mddev) {
9173 if (this && this != rdev)
9175 if (test_bit(Candidate, &rdev->flags))
9177 if (rdev->raid_disk >= 0 &&
9178 !test_bit(In_sync, &rdev->flags) &&
9179 !test_bit(Journal, &rdev->flags) &&
9180 !test_bit(Faulty, &rdev->flags))
9182 if (rdev->raid_disk >= 0)
9184 if (test_bit(Faulty, &rdev->flags))
9186 if (!test_bit(Journal, &rdev->flags)) {
9188 ! (rdev->saved_raid_disk >= 0 &&
9189 !test_bit(Bitmap_sync, &rdev->flags)))
9192 rdev->recovery_offset = 0;
9194 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9195 /* failure here is OK */
9196 sysfs_link_rdev(mddev, rdev);
9197 if (!test_bit(Journal, &rdev->flags))
9199 md_new_event(mddev);
9200 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9205 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9209 static void md_start_sync(struct work_struct *ws)
9211 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9213 mddev->sync_thread = md_register_thread(md_do_sync,
9216 if (!mddev->sync_thread) {
9217 pr_warn("%s: could not start resync thread...\n",
9219 /* leave the spares where they are, it shouldn't hurt */
9220 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9221 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9222 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9223 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9224 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9225 wake_up(&resync_wait);
9226 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9228 if (mddev->sysfs_action)
9229 sysfs_notify_dirent_safe(mddev->sysfs_action);
9231 md_wakeup_thread(mddev->sync_thread);
9232 sysfs_notify_dirent_safe(mddev->sysfs_action);
9233 md_new_event(mddev);
9237 * This routine is regularly called by all per-raid-array threads to
9238 * deal with generic issues like resync and super-block update.
9239 * Raid personalities that don't have a thread (linear/raid0) do not
9240 * need this as they never do any recovery or update the superblock.
9242 * It does not do any resync itself, but rather "forks" off other threads
9243 * to do that as needed.
9244 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9245 * "->recovery" and create a thread at ->sync_thread.
9246 * When the thread finishes it sets MD_RECOVERY_DONE
9247 * and wakeups up this thread which will reap the thread and finish up.
9248 * This thread also removes any faulty devices (with nr_pending == 0).
9250 * The overall approach is:
9251 * 1/ if the superblock needs updating, update it.
9252 * 2/ If a recovery thread is running, don't do anything else.
9253 * 3/ If recovery has finished, clean up, possibly marking spares active.
9254 * 4/ If there are any faulty devices, remove them.
9255 * 5/ If array is degraded, try to add spares devices
9256 * 6/ If array has spares or is not in-sync, start a resync thread.
9258 void md_check_recovery(struct mddev *mddev)
9260 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9261 /* Write superblock - thread that called mddev_suspend()
9262 * holds reconfig_mutex for us.
9264 set_bit(MD_UPDATING_SB, &mddev->flags);
9265 smp_mb__after_atomic();
9266 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9267 md_update_sb(mddev, 0);
9268 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9269 wake_up(&mddev->sb_wait);
9272 if (mddev->suspended)
9276 md_bitmap_daemon_work(mddev);
9278 if (signal_pending(current)) {
9279 if (mddev->pers->sync_request && !mddev->external) {
9280 pr_debug("md: %s in immediate safe mode\n",
9282 mddev->safemode = 2;
9284 flush_signals(current);
9287 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9290 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9291 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9292 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9293 (mddev->external == 0 && mddev->safemode == 1) ||
9294 (mddev->safemode == 2
9295 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9299 if (mddev_trylock(mddev)) {
9301 bool try_set_sync = mddev->safemode != 0;
9303 if (!mddev->external && mddev->safemode == 1)
9304 mddev->safemode = 0;
9307 struct md_rdev *rdev;
9308 if (!mddev->external && mddev->in_sync)
9309 /* 'Blocked' flag not needed as failed devices
9310 * will be recorded if array switched to read/write.
9311 * Leaving it set will prevent the device
9312 * from being removed.
9314 rdev_for_each(rdev, mddev)
9315 clear_bit(Blocked, &rdev->flags);
9316 /* On a read-only array we can:
9317 * - remove failed devices
9318 * - add already-in_sync devices if the array itself
9320 * As we only add devices that are already in-sync,
9321 * we can activate the spares immediately.
9323 remove_and_add_spares(mddev, NULL);
9324 /* There is no thread, but we need to call
9325 * ->spare_active and clear saved_raid_disk
9327 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9328 md_reap_sync_thread(mddev);
9329 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9330 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9331 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9335 if (mddev_is_clustered(mddev)) {
9336 struct md_rdev *rdev, *tmp;
9337 /* kick the device if another node issued a
9340 rdev_for_each_safe(rdev, tmp, mddev) {
9341 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9342 rdev->raid_disk < 0)
9343 md_kick_rdev_from_array(rdev);
9347 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9348 spin_lock(&mddev->lock);
9350 spin_unlock(&mddev->lock);
9353 if (mddev->sb_flags)
9354 md_update_sb(mddev, 0);
9356 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9357 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9358 /* resync/recovery still happening */
9359 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9362 if (mddev->sync_thread) {
9363 md_reap_sync_thread(mddev);
9366 /* Set RUNNING before clearing NEEDED to avoid
9367 * any transients in the value of "sync_action".
9369 mddev->curr_resync_completed = 0;
9370 spin_lock(&mddev->lock);
9371 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9372 spin_unlock(&mddev->lock);
9373 /* Clear some bits that don't mean anything, but
9376 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9377 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9379 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9380 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9382 /* no recovery is running.
9383 * remove any failed drives, then
9384 * add spares if possible.
9385 * Spares are also removed and re-added, to allow
9386 * the personality to fail the re-add.
9389 if (mddev->reshape_position != MaxSector) {
9390 if (mddev->pers->check_reshape == NULL ||
9391 mddev->pers->check_reshape(mddev) != 0)
9392 /* Cannot proceed */
9394 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9395 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9396 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9397 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9398 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9399 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9400 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9401 } else if (mddev->recovery_cp < MaxSector) {
9402 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9403 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9404 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9405 /* nothing to be done ... */
9408 if (mddev->pers->sync_request) {
9410 /* We are adding a device or devices to an array
9411 * which has the bitmap stored on all devices.
9412 * So make sure all bitmap pages get written
9414 md_bitmap_write_all(mddev->bitmap);
9416 INIT_WORK(&mddev->del_work, md_start_sync);
9417 queue_work(md_misc_wq, &mddev->del_work);
9421 if (!mddev->sync_thread) {
9422 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9423 wake_up(&resync_wait);
9424 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9426 if (mddev->sysfs_action)
9427 sysfs_notify_dirent_safe(mddev->sysfs_action);
9430 wake_up(&mddev->sb_wait);
9431 mddev_unlock(mddev);
9434 EXPORT_SYMBOL(md_check_recovery);
9436 void md_reap_sync_thread(struct mddev *mddev)
9438 struct md_rdev *rdev;
9439 sector_t old_dev_sectors = mddev->dev_sectors;
9440 bool is_reshaped = false;
9442 /* resync has finished, collect result */
9443 md_unregister_thread(&mddev->sync_thread);
9444 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9445 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9446 mddev->degraded != mddev->raid_disks) {
9448 /* activate any spares */
9449 if (mddev->pers->spare_active(mddev)) {
9450 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9451 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9454 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9455 mddev->pers->finish_reshape) {
9456 mddev->pers->finish_reshape(mddev);
9457 if (mddev_is_clustered(mddev))
9461 /* If array is no-longer degraded, then any saved_raid_disk
9462 * information must be scrapped.
9464 if (!mddev->degraded)
9465 rdev_for_each(rdev, mddev)
9466 rdev->saved_raid_disk = -1;
9468 md_update_sb(mddev, 1);
9469 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9470 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9472 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9473 md_cluster_ops->resync_finish(mddev);
9474 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9475 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9476 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9477 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9478 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9479 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9481 * We call md_cluster_ops->update_size here because sync_size could
9482 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9483 * so it is time to update size across cluster.
9485 if (mddev_is_clustered(mddev) && is_reshaped
9486 && !test_bit(MD_CLOSING, &mddev->flags))
9487 md_cluster_ops->update_size(mddev, old_dev_sectors);
9488 wake_up(&resync_wait);
9489 /* flag recovery needed just to double check */
9490 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9491 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9492 sysfs_notify_dirent_safe(mddev->sysfs_action);
9493 md_new_event(mddev);
9494 if (mddev->event_work.func)
9495 queue_work(md_misc_wq, &mddev->event_work);
9497 EXPORT_SYMBOL(md_reap_sync_thread);
9499 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9501 sysfs_notify_dirent_safe(rdev->sysfs_state);
9502 wait_event_timeout(rdev->blocked_wait,
9503 !test_bit(Blocked, &rdev->flags) &&
9504 !test_bit(BlockedBadBlocks, &rdev->flags),
9505 msecs_to_jiffies(5000));
9506 rdev_dec_pending(rdev, mddev);
9508 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9510 void md_finish_reshape(struct mddev *mddev)
9512 /* called be personality module when reshape completes. */
9513 struct md_rdev *rdev;
9515 rdev_for_each(rdev, mddev) {
9516 if (rdev->data_offset > rdev->new_data_offset)
9517 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9519 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9520 rdev->data_offset = rdev->new_data_offset;
9523 EXPORT_SYMBOL(md_finish_reshape);
9525 /* Bad block management */
9527 /* Returns 1 on success, 0 on failure */
9528 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9531 struct mddev *mddev = rdev->mddev;
9534 s += rdev->new_data_offset;
9536 s += rdev->data_offset;
9537 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9539 /* Make sure they get written out promptly */
9540 if (test_bit(ExternalBbl, &rdev->flags))
9541 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9542 sysfs_notify_dirent_safe(rdev->sysfs_state);
9543 set_mask_bits(&mddev->sb_flags, 0,
9544 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9545 md_wakeup_thread(rdev->mddev->thread);
9550 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9552 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9557 s += rdev->new_data_offset;
9559 s += rdev->data_offset;
9560 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9561 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9562 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9565 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9567 static int md_notify_reboot(struct notifier_block *this,
9568 unsigned long code, void *x)
9570 struct list_head *tmp;
9571 struct mddev *mddev;
9574 for_each_mddev(mddev, tmp) {
9575 if (mddev_trylock(mddev)) {
9577 __md_stop_writes(mddev);
9578 if (mddev->persistent)
9579 mddev->safemode = 2;
9580 mddev_unlock(mddev);
9585 * certain more exotic SCSI devices are known to be
9586 * volatile wrt too early system reboots. While the
9587 * right place to handle this issue is the given
9588 * driver, we do want to have a safe RAID driver ...
9596 static struct notifier_block md_notifier = {
9597 .notifier_call = md_notify_reboot,
9599 .priority = INT_MAX, /* before any real devices */
9602 static void md_geninit(void)
9604 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9606 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9609 static int __init md_init(void)
9613 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9617 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9621 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9622 if (!md_rdev_misc_wq)
9623 goto err_rdev_misc_wq;
9625 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9628 if ((ret = register_blkdev(0, "mdp")) < 0)
9632 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9633 md_probe, NULL, NULL);
9634 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9635 md_probe, NULL, NULL);
9637 register_reboot_notifier(&md_notifier);
9638 raid_table_header = register_sysctl_table(raid_root_table);
9644 unregister_blkdev(MD_MAJOR, "md");
9646 destroy_workqueue(md_rdev_misc_wq);
9648 destroy_workqueue(md_misc_wq);
9650 destroy_workqueue(md_wq);
9655 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9657 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9658 struct md_rdev *rdev2, *tmp;
9660 char b[BDEVNAME_SIZE];
9663 * If size is changed in another node then we need to
9664 * do resize as well.
9666 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9667 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9669 pr_info("md-cluster: resize failed\n");
9671 md_bitmap_update_sb(mddev->bitmap);
9674 /* Check for change of roles in the active devices */
9675 rdev_for_each_safe(rdev2, tmp, mddev) {
9676 if (test_bit(Faulty, &rdev2->flags))
9679 /* Check if the roles changed */
9680 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9682 if (test_bit(Candidate, &rdev2->flags)) {
9683 if (role == 0xfffe) {
9684 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9685 md_kick_rdev_from_array(rdev2);
9689 clear_bit(Candidate, &rdev2->flags);
9692 if (role != rdev2->raid_disk) {
9694 * got activated except reshape is happening.
9696 if (rdev2->raid_disk == -1 && role != 0xffff &&
9697 !(le32_to_cpu(sb->feature_map) &
9698 MD_FEATURE_RESHAPE_ACTIVE)) {
9699 rdev2->saved_raid_disk = role;
9700 ret = remove_and_add_spares(mddev, rdev2);
9701 pr_info("Activated spare: %s\n",
9702 bdevname(rdev2->bdev,b));
9703 /* wakeup mddev->thread here, so array could
9704 * perform resync with the new activated disk */
9705 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9706 md_wakeup_thread(mddev->thread);
9709 * We just want to do the minimum to mark the disk
9710 * as faulty. The recovery is performed by the
9711 * one who initiated the error.
9713 if ((role == 0xfffe) || (role == 0xfffd)) {
9714 md_error(mddev, rdev2);
9715 clear_bit(Blocked, &rdev2->flags);
9720 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9721 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9723 pr_warn("md: updating array disks failed. %d\n", ret);
9727 * Since mddev->delta_disks has already updated in update_raid_disks,
9728 * so it is time to check reshape.
9730 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9731 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9733 * reshape is happening in the remote node, we need to
9734 * update reshape_position and call start_reshape.
9736 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9737 if (mddev->pers->update_reshape_pos)
9738 mddev->pers->update_reshape_pos(mddev);
9739 if (mddev->pers->start_reshape)
9740 mddev->pers->start_reshape(mddev);
9741 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9742 mddev->reshape_position != MaxSector &&
9743 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9744 /* reshape is just done in another node. */
9745 mddev->reshape_position = MaxSector;
9746 if (mddev->pers->update_reshape_pos)
9747 mddev->pers->update_reshape_pos(mddev);
9750 /* Finally set the event to be up to date */
9751 mddev->events = le64_to_cpu(sb->events);
9754 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9757 struct page *swapout = rdev->sb_page;
9758 struct mdp_superblock_1 *sb;
9760 /* Store the sb page of the rdev in the swapout temporary
9761 * variable in case we err in the future
9763 rdev->sb_page = NULL;
9764 err = alloc_disk_sb(rdev);
9766 ClearPageUptodate(rdev->sb_page);
9767 rdev->sb_loaded = 0;
9768 err = super_types[mddev->major_version].
9769 load_super(rdev, NULL, mddev->minor_version);
9772 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9773 __func__, __LINE__, rdev->desc_nr, err);
9775 put_page(rdev->sb_page);
9776 rdev->sb_page = swapout;
9777 rdev->sb_loaded = 1;
9781 sb = page_address(rdev->sb_page);
9782 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9786 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9787 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9789 /* The other node finished recovery, call spare_active to set
9790 * device In_sync and mddev->degraded
9792 if (rdev->recovery_offset == MaxSector &&
9793 !test_bit(In_sync, &rdev->flags) &&
9794 mddev->pers->spare_active(mddev))
9795 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9801 void md_reload_sb(struct mddev *mddev, int nr)
9803 struct md_rdev *rdev = NULL, *iter;
9807 rdev_for_each_rcu(iter, mddev) {
9808 if (iter->desc_nr == nr) {
9815 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9819 err = read_rdev(mddev, rdev);
9823 check_sb_changes(mddev, rdev);
9825 /* Read all rdev's to update recovery_offset */
9826 rdev_for_each_rcu(rdev, mddev) {
9827 if (!test_bit(Faulty, &rdev->flags))
9828 read_rdev(mddev, rdev);
9831 EXPORT_SYMBOL(md_reload_sb);
9836 * Searches all registered partitions for autorun RAID arrays
9840 static DEFINE_MUTEX(detected_devices_mutex);
9841 static LIST_HEAD(all_detected_devices);
9842 struct detected_devices_node {
9843 struct list_head list;
9847 void md_autodetect_dev(dev_t dev)
9849 struct detected_devices_node *node_detected_dev;
9851 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9852 if (node_detected_dev) {
9853 node_detected_dev->dev = dev;
9854 mutex_lock(&detected_devices_mutex);
9855 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9856 mutex_unlock(&detected_devices_mutex);
9860 void md_autostart_arrays(int part)
9862 struct md_rdev *rdev;
9863 struct detected_devices_node *node_detected_dev;
9865 int i_scanned, i_passed;
9870 pr_info("md: Autodetecting RAID arrays.\n");
9872 mutex_lock(&detected_devices_mutex);
9873 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9875 node_detected_dev = list_entry(all_detected_devices.next,
9876 struct detected_devices_node, list);
9877 list_del(&node_detected_dev->list);
9878 dev = node_detected_dev->dev;
9879 kfree(node_detected_dev);
9880 mutex_unlock(&detected_devices_mutex);
9881 rdev = md_import_device(dev,0, 90);
9882 mutex_lock(&detected_devices_mutex);
9886 if (test_bit(Faulty, &rdev->flags))
9889 set_bit(AutoDetected, &rdev->flags);
9890 list_add(&rdev->same_set, &pending_raid_disks);
9893 mutex_unlock(&detected_devices_mutex);
9895 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9897 autorun_devices(part);
9900 #endif /* !MODULE */
9902 static __exit void md_exit(void)
9904 struct mddev *mddev;
9905 struct list_head *tmp;
9908 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9909 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9911 unregister_blkdev(MD_MAJOR,"md");
9912 unregister_blkdev(mdp_major, "mdp");
9913 unregister_reboot_notifier(&md_notifier);
9914 unregister_sysctl_table(raid_table_header);
9916 /* We cannot unload the modules while some process is
9917 * waiting for us in select() or poll() - wake them up
9920 while (waitqueue_active(&md_event_waiters)) {
9921 /* not safe to leave yet */
9922 wake_up(&md_event_waiters);
9926 remove_proc_entry("mdstat", NULL);
9928 for_each_mddev(mddev, tmp) {
9929 export_array(mddev);
9931 mddev->hold_active = 0;
9933 * for_each_mddev() will call mddev_put() at the end of each
9934 * iteration. As the mddev is now fully clear, this will
9935 * schedule the mddev for destruction by a workqueue, and the
9936 * destroy_workqueue() below will wait for that to complete.
9939 destroy_workqueue(md_rdev_misc_wq);
9940 destroy_workqueue(md_misc_wq);
9941 destroy_workqueue(md_wq);
9944 subsys_initcall(md_init);
9945 module_exit(md_exit)
9947 static int get_ro(char *buffer, const struct kernel_param *kp)
9949 return sprintf(buffer, "%d\n", start_readonly);
9951 static int set_ro(const char *val, const struct kernel_param *kp)
9953 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9956 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9957 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9958 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9959 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9961 MODULE_LICENSE("GPL");
9962 MODULE_DESCRIPTION("MD RAID framework");
9964 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);