1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/blk-integrity.h>
45 #include <linux/badblocks.h>
46 #include <linux/sysctl.h>
47 #include <linux/seq_file.h>
49 #include <linux/poll.h>
50 #include <linux/ctype.h>
51 #include <linux/string.h>
52 #include <linux/hdreg.h>
53 #include <linux/proc_fs.h>
54 #include <linux/random.h>
55 #include <linux/major.h>
56 #include <linux/module.h>
57 #include <linux/reboot.h>
58 #include <linux/file.h>
59 #include <linux/compat.h>
60 #include <linux/delay.h>
61 #include <linux/raid/md_p.h>
62 #include <linux/raid/md_u.h>
63 #include <linux/raid/detect.h>
64 #include <linux/slab.h>
65 #include <linux/percpu-refcount.h>
66 #include <linux/part_stat.h>
68 #include <trace/events/block.h>
70 #include "md-bitmap.h"
71 #include "md-cluster.h"
73 /* pers_list is a list of registered personalities protected
75 * pers_lock does extra service to protect accesses to
76 * mddev->thread when the mutex cannot be held.
78 static LIST_HEAD(pers_list);
79 static DEFINE_SPINLOCK(pers_lock);
81 static struct kobj_type md_ktype;
83 struct md_cluster_operations *md_cluster_ops;
84 EXPORT_SYMBOL(md_cluster_ops);
85 static struct module *md_cluster_mod;
87 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
88 static struct workqueue_struct *md_wq;
89 static struct workqueue_struct *md_misc_wq;
90 static struct workqueue_struct *md_rdev_misc_wq;
92 static int remove_and_add_spares(struct mddev *mddev,
93 struct md_rdev *this);
94 static void mddev_detach(struct mddev *mddev);
97 * Default number of read corrections we'll attempt on an rdev
98 * before ejecting it from the array. We divide the read error
99 * count by 2 for every hour elapsed between read errors.
101 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
102 /* Default safemode delay: 200 msec */
103 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
105 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
106 * is 1000 KB/sec, so the extra system load does not show up that much.
107 * Increase it if you want to have more _guaranteed_ speed. Note that
108 * the RAID driver will use the maximum available bandwidth if the IO
109 * subsystem is idle. There is also an 'absolute maximum' reconstruction
110 * speed limit - in case reconstruction slows down your system despite
113 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
114 * or /sys/block/mdX/md/sync_speed_{min,max}
117 static int sysctl_speed_limit_min = 1000;
118 static int sysctl_speed_limit_max = 200000;
119 static inline int speed_min(struct mddev *mddev)
121 return mddev->sync_speed_min ?
122 mddev->sync_speed_min : sysctl_speed_limit_min;
125 static inline int speed_max(struct mddev *mddev)
127 return mddev->sync_speed_max ?
128 mddev->sync_speed_max : sysctl_speed_limit_max;
131 static void rdev_uninit_serial(struct md_rdev *rdev)
133 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
136 kvfree(rdev->serial);
140 static void rdevs_uninit_serial(struct mddev *mddev)
142 struct md_rdev *rdev;
144 rdev_for_each(rdev, mddev)
145 rdev_uninit_serial(rdev);
148 static int rdev_init_serial(struct md_rdev *rdev)
150 /* serial_nums equals with BARRIER_BUCKETS_NR */
151 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
152 struct serial_in_rdev *serial = NULL;
154 if (test_bit(CollisionCheck, &rdev->flags))
157 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
162 for (i = 0; i < serial_nums; i++) {
163 struct serial_in_rdev *serial_tmp = &serial[i];
165 spin_lock_init(&serial_tmp->serial_lock);
166 serial_tmp->serial_rb = RB_ROOT_CACHED;
167 init_waitqueue_head(&serial_tmp->serial_io_wait);
170 rdev->serial = serial;
171 set_bit(CollisionCheck, &rdev->flags);
176 static int rdevs_init_serial(struct mddev *mddev)
178 struct md_rdev *rdev;
181 rdev_for_each(rdev, mddev) {
182 ret = rdev_init_serial(rdev);
187 /* Free all resources if pool is not existed */
188 if (ret && !mddev->serial_info_pool)
189 rdevs_uninit_serial(mddev);
195 * rdev needs to enable serial stuffs if it meets the conditions:
196 * 1. it is multi-queue device flaged with writemostly.
197 * 2. the write-behind mode is enabled.
199 static int rdev_need_serial(struct md_rdev *rdev)
201 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
202 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
203 test_bit(WriteMostly, &rdev->flags));
207 * Init resource for rdev(s), then create serial_info_pool if:
208 * 1. rdev is the first device which return true from rdev_enable_serial.
209 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
211 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
216 if (rdev && !rdev_need_serial(rdev) &&
217 !test_bit(CollisionCheck, &rdev->flags))
221 mddev_suspend(mddev);
224 ret = rdevs_init_serial(mddev);
226 ret = rdev_init_serial(rdev);
230 if (mddev->serial_info_pool == NULL) {
232 * already in memalloc noio context by
235 mddev->serial_info_pool =
236 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
237 sizeof(struct serial_info));
238 if (!mddev->serial_info_pool) {
239 rdevs_uninit_serial(mddev);
240 pr_err("can't alloc memory pool for serialization\n");
250 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
251 * 1. rdev is the last device flaged with CollisionCheck.
252 * 2. when bitmap is destroyed while policy is not enabled.
253 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
255 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
258 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
261 if (mddev->serial_info_pool) {
262 struct md_rdev *temp;
263 int num = 0; /* used to track if other rdevs need the pool */
266 mddev_suspend(mddev);
267 rdev_for_each(temp, mddev) {
269 if (!mddev->serialize_policy ||
270 !rdev_need_serial(temp))
271 rdev_uninit_serial(temp);
274 } else if (temp != rdev &&
275 test_bit(CollisionCheck, &temp->flags))
280 rdev_uninit_serial(rdev);
283 pr_info("The mempool could be used by other devices\n");
285 mempool_destroy(mddev->serial_info_pool);
286 mddev->serial_info_pool = NULL;
293 static struct ctl_table_header *raid_table_header;
295 static struct ctl_table raid_table[] = {
297 .procname = "speed_limit_min",
298 .data = &sysctl_speed_limit_min,
299 .maxlen = sizeof(int),
300 .mode = S_IRUGO|S_IWUSR,
301 .proc_handler = proc_dointvec,
304 .procname = "speed_limit_max",
305 .data = &sysctl_speed_limit_max,
306 .maxlen = sizeof(int),
307 .mode = S_IRUGO|S_IWUSR,
308 .proc_handler = proc_dointvec,
313 static struct ctl_table raid_dir_table[] = {
317 .mode = S_IRUGO|S_IXUGO,
323 static struct ctl_table raid_root_table[] = {
328 .child = raid_dir_table,
333 static int start_readonly;
336 * The original mechanism for creating an md device is to create
337 * a device node in /dev and to open it. This causes races with device-close.
338 * The preferred method is to write to the "new_array" module parameter.
339 * This can avoid races.
340 * Setting create_on_open to false disables the original mechanism
341 * so all the races disappear.
343 static bool create_on_open = true;
346 * We have a system wide 'event count' that is incremented
347 * on any 'interesting' event, and readers of /proc/mdstat
348 * can use 'poll' or 'select' to find out when the event
352 * start array, stop array, error, add device, remove device,
353 * start build, activate spare
355 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
356 static atomic_t md_event_count;
357 void md_new_event(void)
359 atomic_inc(&md_event_count);
360 wake_up(&md_event_waiters);
362 EXPORT_SYMBOL_GPL(md_new_event);
365 * Enables to iterate over all existing md arrays
366 * all_mddevs_lock protects this list.
368 static LIST_HEAD(all_mddevs);
369 static DEFINE_SPINLOCK(all_mddevs_lock);
372 * iterates through all used mddevs in the system.
373 * We take care to grab the all_mddevs_lock whenever navigating
374 * the list, and to always hold a refcount when unlocked.
375 * Any code which breaks out of this loop while own
376 * a reference to the current mddev and must mddev_put it.
378 #define for_each_mddev(_mddev,_tmp) \
380 for (({ spin_lock(&all_mddevs_lock); \
381 _tmp = all_mddevs.next; \
383 ({ if (_tmp != &all_mddevs) \
384 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
385 spin_unlock(&all_mddevs_lock); \
386 if (_mddev) mddev_put(_mddev); \
387 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
388 _tmp != &all_mddevs;}); \
389 ({ spin_lock(&all_mddevs_lock); \
390 _tmp = _tmp->next;}) \
393 /* Rather than calling directly into the personality make_request function,
394 * IO requests come here first so that we can check if the device is
395 * being suspended pending a reconfiguration.
396 * We hold a refcount over the call to ->make_request. By the time that
397 * call has finished, the bio has been linked into some internal structure
398 * and so is visible to ->quiesce(), so we don't need the refcount any more.
400 static bool is_suspended(struct mddev *mddev, struct bio *bio)
402 if (mddev->suspended)
404 if (bio_data_dir(bio) != WRITE)
406 if (mddev->suspend_lo >= mddev->suspend_hi)
408 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
410 if (bio_end_sector(bio) < mddev->suspend_lo)
415 void md_handle_request(struct mddev *mddev, struct bio *bio)
419 if (is_suspended(mddev, bio)) {
422 prepare_to_wait(&mddev->sb_wait, &__wait,
423 TASK_UNINTERRUPTIBLE);
424 if (!is_suspended(mddev, bio))
430 finish_wait(&mddev->sb_wait, &__wait);
432 atomic_inc(&mddev->active_io);
435 if (!mddev->pers->make_request(mddev, bio)) {
436 atomic_dec(&mddev->active_io);
437 wake_up(&mddev->sb_wait);
438 goto check_suspended;
441 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
442 wake_up(&mddev->sb_wait);
444 EXPORT_SYMBOL(md_handle_request);
446 static void md_submit_bio(struct bio *bio)
448 const int rw = bio_data_dir(bio);
449 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
451 if (mddev == NULL || mddev->pers == NULL) {
456 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
461 blk_queue_split(&bio);
463 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
464 if (bio_sectors(bio) != 0)
465 bio->bi_status = BLK_STS_IOERR;
470 /* bio could be mergeable after passing to underlayer */
471 bio->bi_opf &= ~REQ_NOMERGE;
473 md_handle_request(mddev, bio);
476 /* mddev_suspend makes sure no new requests are submitted
477 * to the device, and that any requests that have been submitted
478 * are completely handled.
479 * Once mddev_detach() is called and completes, the module will be
482 void mddev_suspend(struct mddev *mddev)
484 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
485 lockdep_assert_held(&mddev->reconfig_mutex);
486 if (mddev->suspended++)
489 wake_up(&mddev->sb_wait);
490 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
491 smp_mb__after_atomic();
492 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
493 mddev->pers->quiesce(mddev, 1);
494 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
495 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
497 del_timer_sync(&mddev->safemode_timer);
498 /* restrict memory reclaim I/O during raid array is suspend */
499 mddev->noio_flag = memalloc_noio_save();
501 EXPORT_SYMBOL_GPL(mddev_suspend);
503 void mddev_resume(struct mddev *mddev)
505 /* entred the memalloc scope from mddev_suspend() */
506 memalloc_noio_restore(mddev->noio_flag);
507 lockdep_assert_held(&mddev->reconfig_mutex);
508 if (--mddev->suspended)
510 wake_up(&mddev->sb_wait);
511 mddev->pers->quiesce(mddev, 0);
513 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
514 md_wakeup_thread(mddev->thread);
515 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
517 EXPORT_SYMBOL_GPL(mddev_resume);
520 * Generic flush handling for md
523 static void md_end_flush(struct bio *bio)
525 struct md_rdev *rdev = bio->bi_private;
526 struct mddev *mddev = rdev->mddev;
528 rdev_dec_pending(rdev, mddev);
530 if (atomic_dec_and_test(&mddev->flush_pending)) {
531 /* The pre-request flush has finished */
532 queue_work(md_wq, &mddev->flush_work);
537 static void md_submit_flush_data(struct work_struct *ws);
539 static void submit_flushes(struct work_struct *ws)
541 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
542 struct md_rdev *rdev;
544 mddev->start_flush = ktime_get_boottime();
545 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
546 atomic_set(&mddev->flush_pending, 1);
548 rdev_for_each_rcu(rdev, mddev)
549 if (rdev->raid_disk >= 0 &&
550 !test_bit(Faulty, &rdev->flags)) {
551 /* Take two references, one is dropped
552 * when request finishes, one after
553 * we reclaim rcu_read_lock
556 atomic_inc(&rdev->nr_pending);
557 atomic_inc(&rdev->nr_pending);
559 bi = bio_alloc_bioset(GFP_NOIO, 0, &mddev->bio_set);
560 bi->bi_end_io = md_end_flush;
561 bi->bi_private = rdev;
562 bio_set_dev(bi, rdev->bdev);
563 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
564 atomic_inc(&mddev->flush_pending);
567 rdev_dec_pending(rdev, mddev);
570 if (atomic_dec_and_test(&mddev->flush_pending))
571 queue_work(md_wq, &mddev->flush_work);
574 static void md_submit_flush_data(struct work_struct *ws)
576 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
577 struct bio *bio = mddev->flush_bio;
580 * must reset flush_bio before calling into md_handle_request to avoid a
581 * deadlock, because other bios passed md_handle_request suspend check
582 * could wait for this and below md_handle_request could wait for those
583 * bios because of suspend check
585 spin_lock_irq(&mddev->lock);
586 mddev->prev_flush_start = mddev->start_flush;
587 mddev->flush_bio = NULL;
588 spin_unlock_irq(&mddev->lock);
589 wake_up(&mddev->sb_wait);
591 if (bio->bi_iter.bi_size == 0) {
592 /* an empty barrier - all done */
595 bio->bi_opf &= ~REQ_PREFLUSH;
596 md_handle_request(mddev, bio);
601 * Manages consolidation of flushes and submitting any flushes needed for
602 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
603 * being finished in another context. Returns false if the flushing is
604 * complete but still needs the I/O portion of the bio to be processed.
606 bool md_flush_request(struct mddev *mddev, struct bio *bio)
608 ktime_t req_start = ktime_get_boottime();
609 spin_lock_irq(&mddev->lock);
610 /* flush requests wait until ongoing flush completes,
611 * hence coalescing all the pending requests.
613 wait_event_lock_irq(mddev->sb_wait,
615 ktime_before(req_start, mddev->prev_flush_start),
617 /* new request after previous flush is completed */
618 if (ktime_after(req_start, mddev->prev_flush_start)) {
619 WARN_ON(mddev->flush_bio);
620 mddev->flush_bio = bio;
623 spin_unlock_irq(&mddev->lock);
626 INIT_WORK(&mddev->flush_work, submit_flushes);
627 queue_work(md_wq, &mddev->flush_work);
629 /* flush was performed for some other bio while we waited. */
630 if (bio->bi_iter.bi_size == 0)
631 /* an empty barrier - all done */
634 bio->bi_opf &= ~REQ_PREFLUSH;
640 EXPORT_SYMBOL(md_flush_request);
642 static inline struct mddev *mddev_get(struct mddev *mddev)
644 atomic_inc(&mddev->active);
648 static void mddev_delayed_delete(struct work_struct *ws);
650 static void mddev_put(struct mddev *mddev)
652 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
654 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
655 mddev->ctime == 0 && !mddev->hold_active) {
656 /* Array is not configured at all, and not held active,
658 list_del_init(&mddev->all_mddevs);
661 * Call queue_work inside the spinlock so that
662 * flush_workqueue() after mddev_find will succeed in waiting
663 * for the work to be done.
665 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
666 queue_work(md_misc_wq, &mddev->del_work);
668 spin_unlock(&all_mddevs_lock);
671 static void md_safemode_timeout(struct timer_list *t);
673 void mddev_init(struct mddev *mddev)
675 kobject_init(&mddev->kobj, &md_ktype);
676 mutex_init(&mddev->open_mutex);
677 mutex_init(&mddev->reconfig_mutex);
678 mutex_init(&mddev->bitmap_info.mutex);
679 INIT_LIST_HEAD(&mddev->disks);
680 INIT_LIST_HEAD(&mddev->all_mddevs);
681 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
682 atomic_set(&mddev->active, 1);
683 atomic_set(&mddev->openers, 0);
684 atomic_set(&mddev->active_io, 0);
685 spin_lock_init(&mddev->lock);
686 atomic_set(&mddev->flush_pending, 0);
687 init_waitqueue_head(&mddev->sb_wait);
688 init_waitqueue_head(&mddev->recovery_wait);
689 mddev->reshape_position = MaxSector;
690 mddev->reshape_backwards = 0;
691 mddev->last_sync_action = "none";
692 mddev->resync_min = 0;
693 mddev->resync_max = MaxSector;
694 mddev->level = LEVEL_NONE;
696 EXPORT_SYMBOL_GPL(mddev_init);
698 static struct mddev *mddev_find_locked(dev_t unit)
702 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
703 if (mddev->unit == unit)
709 /* find an unused unit number */
710 static dev_t mddev_alloc_unit(void)
712 static int next_minor = 512;
713 int start = next_minor;
718 dev = MKDEV(MD_MAJOR, next_minor);
720 if (next_minor > MINORMASK)
722 if (next_minor == start)
723 return 0; /* Oh dear, all in use. */
724 is_free = !mddev_find_locked(dev);
730 static struct mddev *mddev_find(dev_t unit)
734 if (MAJOR(unit) != MD_MAJOR)
735 unit &= ~((1 << MdpMinorShift) - 1);
737 spin_lock(&all_mddevs_lock);
738 mddev = mddev_find_locked(unit);
741 spin_unlock(&all_mddevs_lock);
746 static struct mddev *mddev_alloc(dev_t unit)
751 if (unit && MAJOR(unit) != MD_MAJOR)
752 unit &= ~((1 << MdpMinorShift) - 1);
754 new = kzalloc(sizeof(*new), GFP_KERNEL);
756 return ERR_PTR(-ENOMEM);
759 spin_lock(&all_mddevs_lock);
762 if (mddev_find_locked(unit))
765 if (MAJOR(unit) == MD_MAJOR)
766 new->md_minor = MINOR(unit);
768 new->md_minor = MINOR(unit) >> MdpMinorShift;
769 new->hold_active = UNTIL_IOCTL;
772 new->unit = mddev_alloc_unit();
775 new->md_minor = MINOR(new->unit);
776 new->hold_active = UNTIL_STOP;
779 list_add(&new->all_mddevs, &all_mddevs);
780 spin_unlock(&all_mddevs_lock);
783 spin_unlock(&all_mddevs_lock);
785 return ERR_PTR(error);
788 static const struct attribute_group md_redundancy_group;
790 void mddev_unlock(struct mddev *mddev)
792 if (mddev->to_remove) {
793 /* These cannot be removed under reconfig_mutex as
794 * an access to the files will try to take reconfig_mutex
795 * while holding the file unremovable, which leads to
797 * So hold set sysfs_active while the remove in happeing,
798 * and anything else which might set ->to_remove or my
799 * otherwise change the sysfs namespace will fail with
800 * -EBUSY if sysfs_active is still set.
801 * We set sysfs_active under reconfig_mutex and elsewhere
802 * test it under the same mutex to ensure its correct value
805 const struct attribute_group *to_remove = mddev->to_remove;
806 mddev->to_remove = NULL;
807 mddev->sysfs_active = 1;
808 mutex_unlock(&mddev->reconfig_mutex);
810 if (mddev->kobj.sd) {
811 if (to_remove != &md_redundancy_group)
812 sysfs_remove_group(&mddev->kobj, to_remove);
813 if (mddev->pers == NULL ||
814 mddev->pers->sync_request == NULL) {
815 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
816 if (mddev->sysfs_action)
817 sysfs_put(mddev->sysfs_action);
818 if (mddev->sysfs_completed)
819 sysfs_put(mddev->sysfs_completed);
820 if (mddev->sysfs_degraded)
821 sysfs_put(mddev->sysfs_degraded);
822 mddev->sysfs_action = NULL;
823 mddev->sysfs_completed = NULL;
824 mddev->sysfs_degraded = NULL;
827 mddev->sysfs_active = 0;
829 mutex_unlock(&mddev->reconfig_mutex);
831 /* As we've dropped the mutex we need a spinlock to
832 * make sure the thread doesn't disappear
834 spin_lock(&pers_lock);
835 md_wakeup_thread(mddev->thread);
836 wake_up(&mddev->sb_wait);
837 spin_unlock(&pers_lock);
839 EXPORT_SYMBOL_GPL(mddev_unlock);
841 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
843 struct md_rdev *rdev;
845 rdev_for_each_rcu(rdev, mddev)
846 if (rdev->desc_nr == nr)
851 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
853 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
855 struct md_rdev *rdev;
857 rdev_for_each(rdev, mddev)
858 if (rdev->bdev->bd_dev == dev)
864 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
866 struct md_rdev *rdev;
868 rdev_for_each_rcu(rdev, mddev)
869 if (rdev->bdev->bd_dev == dev)
874 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
876 static struct md_personality *find_pers(int level, char *clevel)
878 struct md_personality *pers;
879 list_for_each_entry(pers, &pers_list, list) {
880 if (level != LEVEL_NONE && pers->level == level)
882 if (strcmp(pers->name, clevel)==0)
888 /* return the offset of the super block in 512byte sectors */
889 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
891 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
892 return MD_NEW_SIZE_SECTORS(num_sectors);
895 static int alloc_disk_sb(struct md_rdev *rdev)
897 rdev->sb_page = alloc_page(GFP_KERNEL);
903 void md_rdev_clear(struct md_rdev *rdev)
906 put_page(rdev->sb_page);
908 rdev->sb_page = NULL;
913 put_page(rdev->bb_page);
914 rdev->bb_page = NULL;
916 badblocks_exit(&rdev->badblocks);
918 EXPORT_SYMBOL_GPL(md_rdev_clear);
920 static void super_written(struct bio *bio)
922 struct md_rdev *rdev = bio->bi_private;
923 struct mddev *mddev = rdev->mddev;
925 if (bio->bi_status) {
926 pr_err("md: %s gets error=%d\n", __func__,
927 blk_status_to_errno(bio->bi_status));
928 md_error(mddev, rdev);
929 if (!test_bit(Faulty, &rdev->flags)
930 && (bio->bi_opf & MD_FAILFAST)) {
931 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
932 set_bit(LastDev, &rdev->flags);
935 clear_bit(LastDev, &rdev->flags);
937 if (atomic_dec_and_test(&mddev->pending_writes))
938 wake_up(&mddev->sb_wait);
939 rdev_dec_pending(rdev, mddev);
943 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
944 sector_t sector, int size, struct page *page)
946 /* write first size bytes of page to sector of rdev
947 * Increment mddev->pending_writes before returning
948 * and decrement it on completion, waking up sb_wait
949 * if zero is reached.
950 * If an error occurred, call md_error
958 if (test_bit(Faulty, &rdev->flags))
961 bio = bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
963 atomic_inc(&rdev->nr_pending);
965 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
966 bio->bi_iter.bi_sector = sector;
967 bio_add_page(bio, page, size, 0);
968 bio->bi_private = rdev;
969 bio->bi_end_io = super_written;
971 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
972 test_bit(FailFast, &rdev->flags) &&
973 !test_bit(LastDev, &rdev->flags))
975 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
977 atomic_inc(&mddev->pending_writes);
981 int md_super_wait(struct mddev *mddev)
983 /* wait for all superblock writes that were scheduled to complete */
984 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
985 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
990 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
991 struct page *page, int op, int op_flags, bool metadata_op)
996 bio_init(&bio, &bvec, 1);
998 if (metadata_op && rdev->meta_bdev)
999 bio_set_dev(&bio, rdev->meta_bdev);
1001 bio_set_dev(&bio, rdev->bdev);
1002 bio.bi_opf = op | op_flags;
1004 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1005 else if (rdev->mddev->reshape_position != MaxSector &&
1006 (rdev->mddev->reshape_backwards ==
1007 (sector >= rdev->mddev->reshape_position)))
1008 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1010 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1011 bio_add_page(&bio, page, size, 0);
1013 submit_bio_wait(&bio);
1015 return !bio.bi_status;
1017 EXPORT_SYMBOL_GPL(sync_page_io);
1019 static int read_disk_sb(struct md_rdev *rdev, int size)
1021 char b[BDEVNAME_SIZE];
1023 if (rdev->sb_loaded)
1026 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1028 rdev->sb_loaded = 1;
1032 pr_err("md: disabled device %s, could not read superblock.\n",
1033 bdevname(rdev->bdev,b));
1037 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1039 return sb1->set_uuid0 == sb2->set_uuid0 &&
1040 sb1->set_uuid1 == sb2->set_uuid1 &&
1041 sb1->set_uuid2 == sb2->set_uuid2 &&
1042 sb1->set_uuid3 == sb2->set_uuid3;
1045 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1048 mdp_super_t *tmp1, *tmp2;
1050 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1051 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1053 if (!tmp1 || !tmp2) {
1062 * nr_disks is not constant
1067 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1074 static u32 md_csum_fold(u32 csum)
1076 csum = (csum & 0xffff) + (csum >> 16);
1077 return (csum & 0xffff) + (csum >> 16);
1080 static unsigned int calc_sb_csum(mdp_super_t *sb)
1083 u32 *sb32 = (u32*)sb;
1085 unsigned int disk_csum, csum;
1087 disk_csum = sb->sb_csum;
1090 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1092 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1095 /* This used to use csum_partial, which was wrong for several
1096 * reasons including that different results are returned on
1097 * different architectures. It isn't critical that we get exactly
1098 * the same return value as before (we always csum_fold before
1099 * testing, and that removes any differences). However as we
1100 * know that csum_partial always returned a 16bit value on
1101 * alphas, do a fold to maximise conformity to previous behaviour.
1103 sb->sb_csum = md_csum_fold(disk_csum);
1105 sb->sb_csum = disk_csum;
1111 * Handle superblock details.
1112 * We want to be able to handle multiple superblock formats
1113 * so we have a common interface to them all, and an array of
1114 * different handlers.
1115 * We rely on user-space to write the initial superblock, and support
1116 * reading and updating of superblocks.
1117 * Interface methods are:
1118 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1119 * loads and validates a superblock on dev.
1120 * if refdev != NULL, compare superblocks on both devices
1122 * 0 - dev has a superblock that is compatible with refdev
1123 * 1 - dev has a superblock that is compatible and newer than refdev
1124 * so dev should be used as the refdev in future
1125 * -EINVAL superblock incompatible or invalid
1126 * -othererror e.g. -EIO
1128 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1129 * Verify that dev is acceptable into mddev.
1130 * The first time, mddev->raid_disks will be 0, and data from
1131 * dev should be merged in. Subsequent calls check that dev
1132 * is new enough. Return 0 or -EINVAL
1134 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1135 * Update the superblock for rdev with data in mddev
1136 * This does not write to disc.
1142 struct module *owner;
1143 int (*load_super)(struct md_rdev *rdev,
1144 struct md_rdev *refdev,
1146 int (*validate_super)(struct mddev *mddev,
1147 struct md_rdev *rdev);
1148 void (*sync_super)(struct mddev *mddev,
1149 struct md_rdev *rdev);
1150 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1151 sector_t num_sectors);
1152 int (*allow_new_offset)(struct md_rdev *rdev,
1153 unsigned long long new_offset);
1157 * Check that the given mddev has no bitmap.
1159 * This function is called from the run method of all personalities that do not
1160 * support bitmaps. It prints an error message and returns non-zero if mddev
1161 * has a bitmap. Otherwise, it returns 0.
1164 int md_check_no_bitmap(struct mddev *mddev)
1166 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1168 pr_warn("%s: bitmaps are not supported for %s\n",
1169 mdname(mddev), mddev->pers->name);
1172 EXPORT_SYMBOL(md_check_no_bitmap);
1175 * load_super for 0.90.0
1177 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1179 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1182 bool spare_disk = true;
1185 * Calculate the position of the superblock (512byte sectors),
1186 * it's at the end of the disk.
1188 * It also happens to be a multiple of 4Kb.
1190 rdev->sb_start = calc_dev_sboffset(rdev);
1192 ret = read_disk_sb(rdev, MD_SB_BYTES);
1198 bdevname(rdev->bdev, b);
1199 sb = page_address(rdev->sb_page);
1201 if (sb->md_magic != MD_SB_MAGIC) {
1202 pr_warn("md: invalid raid superblock magic on %s\n", b);
1206 if (sb->major_version != 0 ||
1207 sb->minor_version < 90 ||
1208 sb->minor_version > 91) {
1209 pr_warn("Bad version number %d.%d on %s\n",
1210 sb->major_version, sb->minor_version, b);
1214 if (sb->raid_disks <= 0)
1217 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1218 pr_warn("md: invalid superblock checksum on %s\n", b);
1222 rdev->preferred_minor = sb->md_minor;
1223 rdev->data_offset = 0;
1224 rdev->new_data_offset = 0;
1225 rdev->sb_size = MD_SB_BYTES;
1226 rdev->badblocks.shift = -1;
1228 if (sb->level == LEVEL_MULTIPATH)
1231 rdev->desc_nr = sb->this_disk.number;
1233 /* not spare disk, or LEVEL_MULTIPATH */
1234 if (sb->level == LEVEL_MULTIPATH ||
1235 (rdev->desc_nr >= 0 &&
1236 rdev->desc_nr < MD_SB_DISKS &&
1237 sb->disks[rdev->desc_nr].state &
1238 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1248 mdp_super_t *refsb = page_address(refdev->sb_page);
1249 if (!md_uuid_equal(refsb, sb)) {
1250 pr_warn("md: %s has different UUID to %s\n",
1251 b, bdevname(refdev->bdev,b2));
1254 if (!md_sb_equal(refsb, sb)) {
1255 pr_warn("md: %s has same UUID but different superblock to %s\n",
1256 b, bdevname(refdev->bdev, b2));
1260 ev2 = md_event(refsb);
1262 if (!spare_disk && ev1 > ev2)
1267 rdev->sectors = rdev->sb_start;
1268 /* Limit to 4TB as metadata cannot record more than that.
1269 * (not needed for Linear and RAID0 as metadata doesn't
1272 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1273 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1275 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1276 /* "this cannot possibly happen" ... */
1284 * validate_super for 0.90.0
1286 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1289 mdp_super_t *sb = page_address(rdev->sb_page);
1290 __u64 ev1 = md_event(sb);
1292 rdev->raid_disk = -1;
1293 clear_bit(Faulty, &rdev->flags);
1294 clear_bit(In_sync, &rdev->flags);
1295 clear_bit(Bitmap_sync, &rdev->flags);
1296 clear_bit(WriteMostly, &rdev->flags);
1298 if (mddev->raid_disks == 0) {
1299 mddev->major_version = 0;
1300 mddev->minor_version = sb->minor_version;
1301 mddev->patch_version = sb->patch_version;
1302 mddev->external = 0;
1303 mddev->chunk_sectors = sb->chunk_size >> 9;
1304 mddev->ctime = sb->ctime;
1305 mddev->utime = sb->utime;
1306 mddev->level = sb->level;
1307 mddev->clevel[0] = 0;
1308 mddev->layout = sb->layout;
1309 mddev->raid_disks = sb->raid_disks;
1310 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1311 mddev->events = ev1;
1312 mddev->bitmap_info.offset = 0;
1313 mddev->bitmap_info.space = 0;
1314 /* bitmap can use 60 K after the 4K superblocks */
1315 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1316 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1317 mddev->reshape_backwards = 0;
1319 if (mddev->minor_version >= 91) {
1320 mddev->reshape_position = sb->reshape_position;
1321 mddev->delta_disks = sb->delta_disks;
1322 mddev->new_level = sb->new_level;
1323 mddev->new_layout = sb->new_layout;
1324 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1325 if (mddev->delta_disks < 0)
1326 mddev->reshape_backwards = 1;
1328 mddev->reshape_position = MaxSector;
1329 mddev->delta_disks = 0;
1330 mddev->new_level = mddev->level;
1331 mddev->new_layout = mddev->layout;
1332 mddev->new_chunk_sectors = mddev->chunk_sectors;
1334 if (mddev->level == 0)
1337 if (sb->state & (1<<MD_SB_CLEAN))
1338 mddev->recovery_cp = MaxSector;
1340 if (sb->events_hi == sb->cp_events_hi &&
1341 sb->events_lo == sb->cp_events_lo) {
1342 mddev->recovery_cp = sb->recovery_cp;
1344 mddev->recovery_cp = 0;
1347 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1348 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1349 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1350 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1352 mddev->max_disks = MD_SB_DISKS;
1354 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1355 mddev->bitmap_info.file == NULL) {
1356 mddev->bitmap_info.offset =
1357 mddev->bitmap_info.default_offset;
1358 mddev->bitmap_info.space =
1359 mddev->bitmap_info.default_space;
1362 } else if (mddev->pers == NULL) {
1363 /* Insist on good event counter while assembling, except
1364 * for spares (which don't need an event count) */
1366 if (sb->disks[rdev->desc_nr].state & (
1367 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1368 if (ev1 < mddev->events)
1370 } else if (mddev->bitmap) {
1371 /* if adding to array with a bitmap, then we can accept an
1372 * older device ... but not too old.
1374 if (ev1 < mddev->bitmap->events_cleared)
1376 if (ev1 < mddev->events)
1377 set_bit(Bitmap_sync, &rdev->flags);
1379 if (ev1 < mddev->events)
1380 /* just a hot-add of a new device, leave raid_disk at -1 */
1384 if (mddev->level != LEVEL_MULTIPATH) {
1385 desc = sb->disks + rdev->desc_nr;
1387 if (desc->state & (1<<MD_DISK_FAULTY))
1388 set_bit(Faulty, &rdev->flags);
1389 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1390 desc->raid_disk < mddev->raid_disks */) {
1391 set_bit(In_sync, &rdev->flags);
1392 rdev->raid_disk = desc->raid_disk;
1393 rdev->saved_raid_disk = desc->raid_disk;
1394 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1395 /* active but not in sync implies recovery up to
1396 * reshape position. We don't know exactly where
1397 * that is, so set to zero for now */
1398 if (mddev->minor_version >= 91) {
1399 rdev->recovery_offset = 0;
1400 rdev->raid_disk = desc->raid_disk;
1403 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1404 set_bit(WriteMostly, &rdev->flags);
1405 if (desc->state & (1<<MD_DISK_FAILFAST))
1406 set_bit(FailFast, &rdev->flags);
1407 } else /* MULTIPATH are always insync */
1408 set_bit(In_sync, &rdev->flags);
1413 * sync_super for 0.90.0
1415 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1418 struct md_rdev *rdev2;
1419 int next_spare = mddev->raid_disks;
1421 /* make rdev->sb match mddev data..
1424 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1425 * 3/ any empty disks < next_spare become removed
1427 * disks[0] gets initialised to REMOVED because
1428 * we cannot be sure from other fields if it has
1429 * been initialised or not.
1432 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1434 rdev->sb_size = MD_SB_BYTES;
1436 sb = page_address(rdev->sb_page);
1438 memset(sb, 0, sizeof(*sb));
1440 sb->md_magic = MD_SB_MAGIC;
1441 sb->major_version = mddev->major_version;
1442 sb->patch_version = mddev->patch_version;
1443 sb->gvalid_words = 0; /* ignored */
1444 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1445 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1446 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1447 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1449 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1450 sb->level = mddev->level;
1451 sb->size = mddev->dev_sectors / 2;
1452 sb->raid_disks = mddev->raid_disks;
1453 sb->md_minor = mddev->md_minor;
1454 sb->not_persistent = 0;
1455 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1457 sb->events_hi = (mddev->events>>32);
1458 sb->events_lo = (u32)mddev->events;
1460 if (mddev->reshape_position == MaxSector)
1461 sb->minor_version = 90;
1463 sb->minor_version = 91;
1464 sb->reshape_position = mddev->reshape_position;
1465 sb->new_level = mddev->new_level;
1466 sb->delta_disks = mddev->delta_disks;
1467 sb->new_layout = mddev->new_layout;
1468 sb->new_chunk = mddev->new_chunk_sectors << 9;
1470 mddev->minor_version = sb->minor_version;
1473 sb->recovery_cp = mddev->recovery_cp;
1474 sb->cp_events_hi = (mddev->events>>32);
1475 sb->cp_events_lo = (u32)mddev->events;
1476 if (mddev->recovery_cp == MaxSector)
1477 sb->state = (1<< MD_SB_CLEAN);
1479 sb->recovery_cp = 0;
1481 sb->layout = mddev->layout;
1482 sb->chunk_size = mddev->chunk_sectors << 9;
1484 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1485 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1487 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1488 rdev_for_each(rdev2, mddev) {
1491 int is_active = test_bit(In_sync, &rdev2->flags);
1493 if (rdev2->raid_disk >= 0 &&
1494 sb->minor_version >= 91)
1495 /* we have nowhere to store the recovery_offset,
1496 * but if it is not below the reshape_position,
1497 * we can piggy-back on that.
1500 if (rdev2->raid_disk < 0 ||
1501 test_bit(Faulty, &rdev2->flags))
1504 desc_nr = rdev2->raid_disk;
1506 desc_nr = next_spare++;
1507 rdev2->desc_nr = desc_nr;
1508 d = &sb->disks[rdev2->desc_nr];
1510 d->number = rdev2->desc_nr;
1511 d->major = MAJOR(rdev2->bdev->bd_dev);
1512 d->minor = MINOR(rdev2->bdev->bd_dev);
1514 d->raid_disk = rdev2->raid_disk;
1516 d->raid_disk = rdev2->desc_nr; /* compatibility */
1517 if (test_bit(Faulty, &rdev2->flags))
1518 d->state = (1<<MD_DISK_FAULTY);
1519 else if (is_active) {
1520 d->state = (1<<MD_DISK_ACTIVE);
1521 if (test_bit(In_sync, &rdev2->flags))
1522 d->state |= (1<<MD_DISK_SYNC);
1530 if (test_bit(WriteMostly, &rdev2->flags))
1531 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1532 if (test_bit(FailFast, &rdev2->flags))
1533 d->state |= (1<<MD_DISK_FAILFAST);
1535 /* now set the "removed" and "faulty" bits on any missing devices */
1536 for (i=0 ; i < mddev->raid_disks ; i++) {
1537 mdp_disk_t *d = &sb->disks[i];
1538 if (d->state == 0 && d->number == 0) {
1541 d->state = (1<<MD_DISK_REMOVED);
1542 d->state |= (1<<MD_DISK_FAULTY);
1546 sb->nr_disks = nr_disks;
1547 sb->active_disks = active;
1548 sb->working_disks = working;
1549 sb->failed_disks = failed;
1550 sb->spare_disks = spare;
1552 sb->this_disk = sb->disks[rdev->desc_nr];
1553 sb->sb_csum = calc_sb_csum(sb);
1557 * rdev_size_change for 0.90.0
1559 static unsigned long long
1560 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1562 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1563 return 0; /* component must fit device */
1564 if (rdev->mddev->bitmap_info.offset)
1565 return 0; /* can't move bitmap */
1566 rdev->sb_start = calc_dev_sboffset(rdev);
1567 if (!num_sectors || num_sectors > rdev->sb_start)
1568 num_sectors = rdev->sb_start;
1569 /* Limit to 4TB as metadata cannot record more than that.
1570 * 4TB == 2^32 KB, or 2*2^32 sectors.
1572 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1573 num_sectors = (sector_t)(2ULL << 32) - 2;
1575 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1577 } while (md_super_wait(rdev->mddev) < 0);
1582 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1584 /* non-zero offset changes not possible with v0.90 */
1585 return new_offset == 0;
1589 * version 1 superblock
1592 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1596 unsigned long long newcsum;
1597 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1598 __le32 *isuper = (__le32*)sb;
1600 disk_csum = sb->sb_csum;
1603 for (; size >= 4; size -= 4)
1604 newcsum += le32_to_cpu(*isuper++);
1607 newcsum += le16_to_cpu(*(__le16*) isuper);
1609 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1610 sb->sb_csum = disk_csum;
1611 return cpu_to_le32(csum);
1614 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1616 struct mdp_superblock_1 *sb;
1620 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1622 bool spare_disk = true;
1625 * Calculate the position of the superblock in 512byte sectors.
1626 * It is always aligned to a 4K boundary and
1627 * depeding on minor_version, it can be:
1628 * 0: At least 8K, but less than 12K, from end of device
1629 * 1: At start of device
1630 * 2: 4K from start of device.
1632 switch(minor_version) {
1634 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1636 sb_start &= ~(sector_t)(4*2-1);
1647 rdev->sb_start = sb_start;
1649 /* superblock is rarely larger than 1K, but it can be larger,
1650 * and it is safe to read 4k, so we do that
1652 ret = read_disk_sb(rdev, 4096);
1653 if (ret) return ret;
1655 sb = page_address(rdev->sb_page);
1657 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1658 sb->major_version != cpu_to_le32(1) ||
1659 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1660 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1661 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1664 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1665 pr_warn("md: invalid superblock checksum on %s\n",
1666 bdevname(rdev->bdev,b));
1669 if (le64_to_cpu(sb->data_size) < 10) {
1670 pr_warn("md: data_size too small on %s\n",
1671 bdevname(rdev->bdev,b));
1676 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1677 /* Some padding is non-zero, might be a new feature */
1680 rdev->preferred_minor = 0xffff;
1681 rdev->data_offset = le64_to_cpu(sb->data_offset);
1682 rdev->new_data_offset = rdev->data_offset;
1683 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1684 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1685 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1686 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1688 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1689 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1690 if (rdev->sb_size & bmask)
1691 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1694 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1697 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1700 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1703 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1705 if (!rdev->bb_page) {
1706 rdev->bb_page = alloc_page(GFP_KERNEL);
1710 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1711 rdev->badblocks.count == 0) {
1712 /* need to load the bad block list.
1713 * Currently we limit it to one page.
1719 int sectors = le16_to_cpu(sb->bblog_size);
1720 if (sectors > (PAGE_SIZE / 512))
1722 offset = le32_to_cpu(sb->bblog_offset);
1725 bb_sector = (long long)offset;
1726 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1727 rdev->bb_page, REQ_OP_READ, 0, true))
1729 bbp = (__le64 *)page_address(rdev->bb_page);
1730 rdev->badblocks.shift = sb->bblog_shift;
1731 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1732 u64 bb = le64_to_cpu(*bbp);
1733 int count = bb & (0x3ff);
1734 u64 sector = bb >> 10;
1735 sector <<= sb->bblog_shift;
1736 count <<= sb->bblog_shift;
1739 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1742 } else if (sb->bblog_offset != 0)
1743 rdev->badblocks.shift = 0;
1745 if ((le32_to_cpu(sb->feature_map) &
1746 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1747 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1748 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1749 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1752 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1756 /* not spare disk, or LEVEL_MULTIPATH */
1757 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1758 (rdev->desc_nr >= 0 &&
1759 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1760 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1761 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1771 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1773 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1774 sb->level != refsb->level ||
1775 sb->layout != refsb->layout ||
1776 sb->chunksize != refsb->chunksize) {
1777 pr_warn("md: %s has strangely different superblock to %s\n",
1778 bdevname(rdev->bdev,b),
1779 bdevname(refdev->bdev,b2));
1782 ev1 = le64_to_cpu(sb->events);
1783 ev2 = le64_to_cpu(refsb->events);
1785 if (!spare_disk && ev1 > ev2)
1790 if (minor_version) {
1791 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1792 sectors -= rdev->data_offset;
1794 sectors = rdev->sb_start;
1795 if (sectors < le64_to_cpu(sb->data_size))
1797 rdev->sectors = le64_to_cpu(sb->data_size);
1801 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1803 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1804 __u64 ev1 = le64_to_cpu(sb->events);
1806 rdev->raid_disk = -1;
1807 clear_bit(Faulty, &rdev->flags);
1808 clear_bit(In_sync, &rdev->flags);
1809 clear_bit(Bitmap_sync, &rdev->flags);
1810 clear_bit(WriteMostly, &rdev->flags);
1812 if (mddev->raid_disks == 0) {
1813 mddev->major_version = 1;
1814 mddev->patch_version = 0;
1815 mddev->external = 0;
1816 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1817 mddev->ctime = le64_to_cpu(sb->ctime);
1818 mddev->utime = le64_to_cpu(sb->utime);
1819 mddev->level = le32_to_cpu(sb->level);
1820 mddev->clevel[0] = 0;
1821 mddev->layout = le32_to_cpu(sb->layout);
1822 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1823 mddev->dev_sectors = le64_to_cpu(sb->size);
1824 mddev->events = ev1;
1825 mddev->bitmap_info.offset = 0;
1826 mddev->bitmap_info.space = 0;
1827 /* Default location for bitmap is 1K after superblock
1828 * using 3K - total of 4K
1830 mddev->bitmap_info.default_offset = 1024 >> 9;
1831 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1832 mddev->reshape_backwards = 0;
1834 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1835 memcpy(mddev->uuid, sb->set_uuid, 16);
1837 mddev->max_disks = (4096-256)/2;
1839 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1840 mddev->bitmap_info.file == NULL) {
1841 mddev->bitmap_info.offset =
1842 (__s32)le32_to_cpu(sb->bitmap_offset);
1843 /* Metadata doesn't record how much space is available.
1844 * For 1.0, we assume we can use up to the superblock
1845 * if before, else to 4K beyond superblock.
1846 * For others, assume no change is possible.
1848 if (mddev->minor_version > 0)
1849 mddev->bitmap_info.space = 0;
1850 else if (mddev->bitmap_info.offset > 0)
1851 mddev->bitmap_info.space =
1852 8 - mddev->bitmap_info.offset;
1854 mddev->bitmap_info.space =
1855 -mddev->bitmap_info.offset;
1858 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1859 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1860 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1861 mddev->new_level = le32_to_cpu(sb->new_level);
1862 mddev->new_layout = le32_to_cpu(sb->new_layout);
1863 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1864 if (mddev->delta_disks < 0 ||
1865 (mddev->delta_disks == 0 &&
1866 (le32_to_cpu(sb->feature_map)
1867 & MD_FEATURE_RESHAPE_BACKWARDS)))
1868 mddev->reshape_backwards = 1;
1870 mddev->reshape_position = MaxSector;
1871 mddev->delta_disks = 0;
1872 mddev->new_level = mddev->level;
1873 mddev->new_layout = mddev->layout;
1874 mddev->new_chunk_sectors = mddev->chunk_sectors;
1877 if (mddev->level == 0 &&
1878 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1881 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1882 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1884 if (le32_to_cpu(sb->feature_map) &
1885 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1886 if (le32_to_cpu(sb->feature_map) &
1887 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1889 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1890 (le32_to_cpu(sb->feature_map) &
1891 MD_FEATURE_MULTIPLE_PPLS))
1893 set_bit(MD_HAS_PPL, &mddev->flags);
1895 } else if (mddev->pers == NULL) {
1896 /* Insist of good event counter while assembling, except for
1897 * spares (which don't need an event count) */
1899 if (rdev->desc_nr >= 0 &&
1900 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1901 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1902 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1903 if (ev1 < mddev->events)
1905 } else if (mddev->bitmap) {
1906 /* If adding to array with a bitmap, then we can accept an
1907 * older device, but not too old.
1909 if (ev1 < mddev->bitmap->events_cleared)
1911 if (ev1 < mddev->events)
1912 set_bit(Bitmap_sync, &rdev->flags);
1914 if (ev1 < mddev->events)
1915 /* just a hot-add of a new device, leave raid_disk at -1 */
1918 if (mddev->level != LEVEL_MULTIPATH) {
1920 if (rdev->desc_nr < 0 ||
1921 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1922 role = MD_DISK_ROLE_SPARE;
1925 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1927 case MD_DISK_ROLE_SPARE: /* spare */
1929 case MD_DISK_ROLE_FAULTY: /* faulty */
1930 set_bit(Faulty, &rdev->flags);
1932 case MD_DISK_ROLE_JOURNAL: /* journal device */
1933 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1934 /* journal device without journal feature */
1935 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1938 set_bit(Journal, &rdev->flags);
1939 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1940 rdev->raid_disk = 0;
1943 rdev->saved_raid_disk = role;
1944 if ((le32_to_cpu(sb->feature_map) &
1945 MD_FEATURE_RECOVERY_OFFSET)) {
1946 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1947 if (!(le32_to_cpu(sb->feature_map) &
1948 MD_FEATURE_RECOVERY_BITMAP))
1949 rdev->saved_raid_disk = -1;
1952 * If the array is FROZEN, then the device can't
1953 * be in_sync with rest of array.
1955 if (!test_bit(MD_RECOVERY_FROZEN,
1957 set_bit(In_sync, &rdev->flags);
1959 rdev->raid_disk = role;
1962 if (sb->devflags & WriteMostly1)
1963 set_bit(WriteMostly, &rdev->flags);
1964 if (sb->devflags & FailFast1)
1965 set_bit(FailFast, &rdev->flags);
1966 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1967 set_bit(Replacement, &rdev->flags);
1968 } else /* MULTIPATH are always insync */
1969 set_bit(In_sync, &rdev->flags);
1974 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1976 struct mdp_superblock_1 *sb;
1977 struct md_rdev *rdev2;
1979 /* make rdev->sb match mddev and rdev data. */
1981 sb = page_address(rdev->sb_page);
1983 sb->feature_map = 0;
1985 sb->recovery_offset = cpu_to_le64(0);
1986 memset(sb->pad3, 0, sizeof(sb->pad3));
1988 sb->utime = cpu_to_le64((__u64)mddev->utime);
1989 sb->events = cpu_to_le64(mddev->events);
1991 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1992 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1993 sb->resync_offset = cpu_to_le64(MaxSector);
1995 sb->resync_offset = cpu_to_le64(0);
1997 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1999 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2000 sb->size = cpu_to_le64(mddev->dev_sectors);
2001 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2002 sb->level = cpu_to_le32(mddev->level);
2003 sb->layout = cpu_to_le32(mddev->layout);
2004 if (test_bit(FailFast, &rdev->flags))
2005 sb->devflags |= FailFast1;
2007 sb->devflags &= ~FailFast1;
2009 if (test_bit(WriteMostly, &rdev->flags))
2010 sb->devflags |= WriteMostly1;
2012 sb->devflags &= ~WriteMostly1;
2013 sb->data_offset = cpu_to_le64(rdev->data_offset);
2014 sb->data_size = cpu_to_le64(rdev->sectors);
2016 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2017 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2018 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2021 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2022 !test_bit(In_sync, &rdev->flags)) {
2024 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2025 sb->recovery_offset =
2026 cpu_to_le64(rdev->recovery_offset);
2027 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2029 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2031 /* Note: recovery_offset and journal_tail share space */
2032 if (test_bit(Journal, &rdev->flags))
2033 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2034 if (test_bit(Replacement, &rdev->flags))
2036 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2038 if (mddev->reshape_position != MaxSector) {
2039 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2040 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2041 sb->new_layout = cpu_to_le32(mddev->new_layout);
2042 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2043 sb->new_level = cpu_to_le32(mddev->new_level);
2044 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2045 if (mddev->delta_disks == 0 &&
2046 mddev->reshape_backwards)
2048 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2049 if (rdev->new_data_offset != rdev->data_offset) {
2051 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2052 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2053 - rdev->data_offset));
2057 if (mddev_is_clustered(mddev))
2058 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2060 if (rdev->badblocks.count == 0)
2061 /* Nothing to do for bad blocks*/ ;
2062 else if (sb->bblog_offset == 0)
2063 /* Cannot record bad blocks on this device */
2064 md_error(mddev, rdev);
2066 struct badblocks *bb = &rdev->badblocks;
2067 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2069 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2074 seq = read_seqbegin(&bb->lock);
2076 memset(bbp, 0xff, PAGE_SIZE);
2078 for (i = 0 ; i < bb->count ; i++) {
2079 u64 internal_bb = p[i];
2080 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2081 | BB_LEN(internal_bb));
2082 bbp[i] = cpu_to_le64(store_bb);
2085 if (read_seqretry(&bb->lock, seq))
2088 bb->sector = (rdev->sb_start +
2089 (int)le32_to_cpu(sb->bblog_offset));
2090 bb->size = le16_to_cpu(sb->bblog_size);
2095 rdev_for_each(rdev2, mddev)
2096 if (rdev2->desc_nr+1 > max_dev)
2097 max_dev = rdev2->desc_nr+1;
2099 if (max_dev > le32_to_cpu(sb->max_dev)) {
2101 sb->max_dev = cpu_to_le32(max_dev);
2102 rdev->sb_size = max_dev * 2 + 256;
2103 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2104 if (rdev->sb_size & bmask)
2105 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2107 max_dev = le32_to_cpu(sb->max_dev);
2109 for (i=0; i<max_dev;i++)
2110 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2112 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2113 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2115 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2116 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2118 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2120 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2121 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2122 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2125 rdev_for_each(rdev2, mddev) {
2127 if (test_bit(Faulty, &rdev2->flags))
2128 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2129 else if (test_bit(In_sync, &rdev2->flags))
2130 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2131 else if (test_bit(Journal, &rdev2->flags))
2132 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2133 else if (rdev2->raid_disk >= 0)
2134 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2136 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2139 sb->sb_csum = calc_sb_1_csum(sb);
2142 static sector_t super_1_choose_bm_space(sector_t dev_size)
2146 /* if the device is bigger than 8Gig, save 64k for bitmap
2147 * usage, if bigger than 200Gig, save 128k
2149 if (dev_size < 64*2)
2151 else if (dev_size - 64*2 >= 200*1024*1024*2)
2153 else if (dev_size - 4*2 > 8*1024*1024*2)
2160 static unsigned long long
2161 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2163 struct mdp_superblock_1 *sb;
2164 sector_t max_sectors;
2165 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2166 return 0; /* component must fit device */
2167 if (rdev->data_offset != rdev->new_data_offset)
2168 return 0; /* too confusing */
2169 if (rdev->sb_start < rdev->data_offset) {
2170 /* minor versions 1 and 2; superblock before data */
2171 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2172 max_sectors -= rdev->data_offset;
2173 if (!num_sectors || num_sectors > max_sectors)
2174 num_sectors = max_sectors;
2175 } else if (rdev->mddev->bitmap_info.offset) {
2176 /* minor version 0 with bitmap we can't move */
2179 /* minor version 0; superblock after data */
2180 sector_t sb_start, bm_space;
2181 sector_t dev_size = i_size_read(rdev->bdev->bd_inode) >> 9;
2183 /* 8K is for superblock */
2184 sb_start = dev_size - 8*2;
2185 sb_start &= ~(sector_t)(4*2 - 1);
2187 bm_space = super_1_choose_bm_space(dev_size);
2189 /* Space that can be used to store date needs to decrease
2190 * superblock bitmap space and bad block space(4K)
2192 max_sectors = sb_start - bm_space - 4*2;
2194 if (!num_sectors || num_sectors > max_sectors)
2195 num_sectors = max_sectors;
2197 sb = page_address(rdev->sb_page);
2198 sb->data_size = cpu_to_le64(num_sectors);
2199 sb->super_offset = cpu_to_le64(rdev->sb_start);
2200 sb->sb_csum = calc_sb_1_csum(sb);
2202 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2204 } while (md_super_wait(rdev->mddev) < 0);
2210 super_1_allow_new_offset(struct md_rdev *rdev,
2211 unsigned long long new_offset)
2213 /* All necessary checks on new >= old have been done */
2214 struct bitmap *bitmap;
2215 if (new_offset >= rdev->data_offset)
2218 /* with 1.0 metadata, there is no metadata to tread on
2219 * so we can always move back */
2220 if (rdev->mddev->minor_version == 0)
2223 /* otherwise we must be sure not to step on
2224 * any metadata, so stay:
2225 * 36K beyond start of superblock
2226 * beyond end of badblocks
2227 * beyond write-intent bitmap
2229 if (rdev->sb_start + (32+4)*2 > new_offset)
2231 bitmap = rdev->mddev->bitmap;
2232 if (bitmap && !rdev->mddev->bitmap_info.file &&
2233 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2234 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2236 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2242 static struct super_type super_types[] = {
2245 .owner = THIS_MODULE,
2246 .load_super = super_90_load,
2247 .validate_super = super_90_validate,
2248 .sync_super = super_90_sync,
2249 .rdev_size_change = super_90_rdev_size_change,
2250 .allow_new_offset = super_90_allow_new_offset,
2254 .owner = THIS_MODULE,
2255 .load_super = super_1_load,
2256 .validate_super = super_1_validate,
2257 .sync_super = super_1_sync,
2258 .rdev_size_change = super_1_rdev_size_change,
2259 .allow_new_offset = super_1_allow_new_offset,
2263 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2265 if (mddev->sync_super) {
2266 mddev->sync_super(mddev, rdev);
2270 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2272 super_types[mddev->major_version].sync_super(mddev, rdev);
2275 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2277 struct md_rdev *rdev, *rdev2;
2280 rdev_for_each_rcu(rdev, mddev1) {
2281 if (test_bit(Faulty, &rdev->flags) ||
2282 test_bit(Journal, &rdev->flags) ||
2283 rdev->raid_disk == -1)
2285 rdev_for_each_rcu(rdev2, mddev2) {
2286 if (test_bit(Faulty, &rdev2->flags) ||
2287 test_bit(Journal, &rdev2->flags) ||
2288 rdev2->raid_disk == -1)
2290 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2300 static LIST_HEAD(pending_raid_disks);
2303 * Try to register data integrity profile for an mddev
2305 * This is called when an array is started and after a disk has been kicked
2306 * from the array. It only succeeds if all working and active component devices
2307 * are integrity capable with matching profiles.
2309 int md_integrity_register(struct mddev *mddev)
2311 struct md_rdev *rdev, *reference = NULL;
2313 if (list_empty(&mddev->disks))
2314 return 0; /* nothing to do */
2315 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2316 return 0; /* shouldn't register, or already is */
2317 rdev_for_each(rdev, mddev) {
2318 /* skip spares and non-functional disks */
2319 if (test_bit(Faulty, &rdev->flags))
2321 if (rdev->raid_disk < 0)
2324 /* Use the first rdev as the reference */
2328 /* does this rdev's profile match the reference profile? */
2329 if (blk_integrity_compare(reference->bdev->bd_disk,
2330 rdev->bdev->bd_disk) < 0)
2333 if (!reference || !bdev_get_integrity(reference->bdev))
2336 * All component devices are integrity capable and have matching
2337 * profiles, register the common profile for the md device.
2339 blk_integrity_register(mddev->gendisk,
2340 bdev_get_integrity(reference->bdev));
2342 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2343 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2344 (mddev->level != 1 && mddev->level != 10 &&
2345 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2347 * No need to handle the failure of bioset_integrity_create,
2348 * because the function is called by md_run() -> pers->run(),
2349 * md_run calls bioset_exit -> bioset_integrity_free in case
2352 pr_err("md: failed to create integrity pool for %s\n",
2358 EXPORT_SYMBOL(md_integrity_register);
2361 * Attempt to add an rdev, but only if it is consistent with the current
2364 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2366 struct blk_integrity *bi_mddev;
2367 char name[BDEVNAME_SIZE];
2369 if (!mddev->gendisk)
2372 bi_mddev = blk_get_integrity(mddev->gendisk);
2374 if (!bi_mddev) /* nothing to do */
2377 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2378 pr_err("%s: incompatible integrity profile for %s\n",
2379 mdname(mddev), bdevname(rdev->bdev, name));
2385 EXPORT_SYMBOL(md_integrity_add_rdev);
2387 static bool rdev_read_only(struct md_rdev *rdev)
2389 return bdev_read_only(rdev->bdev) ||
2390 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2393 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2395 char b[BDEVNAME_SIZE];
2398 /* prevent duplicates */
2399 if (find_rdev(mddev, rdev->bdev->bd_dev))
2402 if (rdev_read_only(rdev) && mddev->pers)
2405 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2406 if (!test_bit(Journal, &rdev->flags) &&
2408 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2410 /* Cannot change size, so fail
2411 * If mddev->level <= 0, then we don't care
2412 * about aligning sizes (e.g. linear)
2414 if (mddev->level > 0)
2417 mddev->dev_sectors = rdev->sectors;
2420 /* Verify rdev->desc_nr is unique.
2421 * If it is -1, assign a free number, else
2422 * check number is not in use
2425 if (rdev->desc_nr < 0) {
2428 choice = mddev->raid_disks;
2429 while (md_find_rdev_nr_rcu(mddev, choice))
2431 rdev->desc_nr = choice;
2433 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2439 if (!test_bit(Journal, &rdev->flags) &&
2440 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2441 pr_warn("md: %s: array is limited to %d devices\n",
2442 mdname(mddev), mddev->max_disks);
2445 bdevname(rdev->bdev,b);
2446 strreplace(b, '/', '!');
2448 rdev->mddev = mddev;
2449 pr_debug("md: bind<%s>\n", b);
2451 if (mddev->raid_disks)
2452 mddev_create_serial_pool(mddev, rdev, false);
2454 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2457 /* failure here is OK */
2458 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2459 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2460 rdev->sysfs_unack_badblocks =
2461 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2462 rdev->sysfs_badblocks =
2463 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2465 list_add_rcu(&rdev->same_set, &mddev->disks);
2466 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2468 /* May as well allow recovery to be retried once */
2469 mddev->recovery_disabled++;
2474 pr_warn("md: failed to register dev-%s for %s\n",
2479 static void rdev_delayed_delete(struct work_struct *ws)
2481 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2482 kobject_del(&rdev->kobj);
2483 kobject_put(&rdev->kobj);
2486 static void unbind_rdev_from_array(struct md_rdev *rdev)
2488 char b[BDEVNAME_SIZE];
2490 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2491 list_del_rcu(&rdev->same_set);
2492 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2493 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2495 sysfs_remove_link(&rdev->kobj, "block");
2496 sysfs_put(rdev->sysfs_state);
2497 sysfs_put(rdev->sysfs_unack_badblocks);
2498 sysfs_put(rdev->sysfs_badblocks);
2499 rdev->sysfs_state = NULL;
2500 rdev->sysfs_unack_badblocks = NULL;
2501 rdev->sysfs_badblocks = NULL;
2502 rdev->badblocks.count = 0;
2503 /* We need to delay this, otherwise we can deadlock when
2504 * writing to 'remove' to "dev/state". We also need
2505 * to delay it due to rcu usage.
2508 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2509 kobject_get(&rdev->kobj);
2510 queue_work(md_rdev_misc_wq, &rdev->del_work);
2514 * prevent the device from being mounted, repartitioned or
2515 * otherwise reused by a RAID array (or any other kernel
2516 * subsystem), by bd_claiming the device.
2518 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2521 struct block_device *bdev;
2523 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2524 shared ? (struct md_rdev *)lock_rdev : rdev);
2526 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2527 MAJOR(dev), MINOR(dev));
2528 return PTR_ERR(bdev);
2534 static void unlock_rdev(struct md_rdev *rdev)
2536 struct block_device *bdev = rdev->bdev;
2538 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2541 void md_autodetect_dev(dev_t dev);
2543 static void export_rdev(struct md_rdev *rdev)
2545 char b[BDEVNAME_SIZE];
2547 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2548 md_rdev_clear(rdev);
2550 if (test_bit(AutoDetected, &rdev->flags))
2551 md_autodetect_dev(rdev->bdev->bd_dev);
2554 kobject_put(&rdev->kobj);
2557 void md_kick_rdev_from_array(struct md_rdev *rdev)
2559 unbind_rdev_from_array(rdev);
2562 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2564 static void export_array(struct mddev *mddev)
2566 struct md_rdev *rdev;
2568 while (!list_empty(&mddev->disks)) {
2569 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2571 md_kick_rdev_from_array(rdev);
2573 mddev->raid_disks = 0;
2574 mddev->major_version = 0;
2577 static bool set_in_sync(struct mddev *mddev)
2579 lockdep_assert_held(&mddev->lock);
2580 if (!mddev->in_sync) {
2581 mddev->sync_checkers++;
2582 spin_unlock(&mddev->lock);
2583 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2584 spin_lock(&mddev->lock);
2585 if (!mddev->in_sync &&
2586 percpu_ref_is_zero(&mddev->writes_pending)) {
2589 * Ensure ->in_sync is visible before we clear
2593 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2594 sysfs_notify_dirent_safe(mddev->sysfs_state);
2596 if (--mddev->sync_checkers == 0)
2597 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2599 if (mddev->safemode == 1)
2600 mddev->safemode = 0;
2601 return mddev->in_sync;
2604 static void sync_sbs(struct mddev *mddev, int nospares)
2606 /* Update each superblock (in-memory image), but
2607 * if we are allowed to, skip spares which already
2608 * have the right event counter, or have one earlier
2609 * (which would mean they aren't being marked as dirty
2610 * with the rest of the array)
2612 struct md_rdev *rdev;
2613 rdev_for_each(rdev, mddev) {
2614 if (rdev->sb_events == mddev->events ||
2616 rdev->raid_disk < 0 &&
2617 rdev->sb_events+1 == mddev->events)) {
2618 /* Don't update this superblock */
2619 rdev->sb_loaded = 2;
2621 sync_super(mddev, rdev);
2622 rdev->sb_loaded = 1;
2627 static bool does_sb_need_changing(struct mddev *mddev)
2629 struct md_rdev *rdev;
2630 struct mdp_superblock_1 *sb;
2633 /* Find a good rdev */
2634 rdev_for_each(rdev, mddev)
2635 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2638 /* No good device found. */
2642 sb = page_address(rdev->sb_page);
2643 /* Check if a device has become faulty or a spare become active */
2644 rdev_for_each(rdev, mddev) {
2645 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2646 /* Device activated? */
2647 if (role == 0xffff && rdev->raid_disk >=0 &&
2648 !test_bit(Faulty, &rdev->flags))
2650 /* Device turned faulty? */
2651 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2655 /* Check if any mddev parameters have changed */
2656 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2657 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2658 (mddev->layout != le32_to_cpu(sb->layout)) ||
2659 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2660 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2666 void md_update_sb(struct mddev *mddev, int force_change)
2668 struct md_rdev *rdev;
2671 int any_badblocks_changed = 0;
2676 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2681 if (mddev_is_clustered(mddev)) {
2682 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2684 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2686 ret = md_cluster_ops->metadata_update_start(mddev);
2687 /* Has someone else has updated the sb */
2688 if (!does_sb_need_changing(mddev)) {
2690 md_cluster_ops->metadata_update_cancel(mddev);
2691 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2692 BIT(MD_SB_CHANGE_DEVS) |
2693 BIT(MD_SB_CHANGE_CLEAN));
2699 * First make sure individual recovery_offsets are correct
2700 * curr_resync_completed can only be used during recovery.
2701 * During reshape/resync it might use array-addresses rather
2702 * that device addresses.
2704 rdev_for_each(rdev, mddev) {
2705 if (rdev->raid_disk >= 0 &&
2706 mddev->delta_disks >= 0 &&
2707 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2708 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2709 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2710 !test_bit(Journal, &rdev->flags) &&
2711 !test_bit(In_sync, &rdev->flags) &&
2712 mddev->curr_resync_completed > rdev->recovery_offset)
2713 rdev->recovery_offset = mddev->curr_resync_completed;
2716 if (!mddev->persistent) {
2717 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2718 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2719 if (!mddev->external) {
2720 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2721 rdev_for_each(rdev, mddev) {
2722 if (rdev->badblocks.changed) {
2723 rdev->badblocks.changed = 0;
2724 ack_all_badblocks(&rdev->badblocks);
2725 md_error(mddev, rdev);
2727 clear_bit(Blocked, &rdev->flags);
2728 clear_bit(BlockedBadBlocks, &rdev->flags);
2729 wake_up(&rdev->blocked_wait);
2732 wake_up(&mddev->sb_wait);
2736 spin_lock(&mddev->lock);
2738 mddev->utime = ktime_get_real_seconds();
2740 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2742 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2743 /* just a clean<-> dirty transition, possibly leave spares alone,
2744 * though if events isn't the right even/odd, we will have to do
2750 if (mddev->degraded)
2751 /* If the array is degraded, then skipping spares is both
2752 * dangerous and fairly pointless.
2753 * Dangerous because a device that was removed from the array
2754 * might have a event_count that still looks up-to-date,
2755 * so it can be re-added without a resync.
2756 * Pointless because if there are any spares to skip,
2757 * then a recovery will happen and soon that array won't
2758 * be degraded any more and the spare can go back to sleep then.
2762 sync_req = mddev->in_sync;
2764 /* If this is just a dirty<->clean transition, and the array is clean
2765 * and 'events' is odd, we can roll back to the previous clean state */
2767 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2768 && mddev->can_decrease_events
2769 && mddev->events != 1) {
2771 mddev->can_decrease_events = 0;
2773 /* otherwise we have to go forward and ... */
2775 mddev->can_decrease_events = nospares;
2779 * This 64-bit counter should never wrap.
2780 * Either we are in around ~1 trillion A.C., assuming
2781 * 1 reboot per second, or we have a bug...
2783 WARN_ON(mddev->events == 0);
2785 rdev_for_each(rdev, mddev) {
2786 if (rdev->badblocks.changed)
2787 any_badblocks_changed++;
2788 if (test_bit(Faulty, &rdev->flags))
2789 set_bit(FaultRecorded, &rdev->flags);
2792 sync_sbs(mddev, nospares);
2793 spin_unlock(&mddev->lock);
2795 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2796 mdname(mddev), mddev->in_sync);
2799 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2801 md_bitmap_update_sb(mddev->bitmap);
2802 rdev_for_each(rdev, mddev) {
2803 char b[BDEVNAME_SIZE];
2805 if (rdev->sb_loaded != 1)
2806 continue; /* no noise on spare devices */
2808 if (!test_bit(Faulty, &rdev->flags)) {
2809 md_super_write(mddev,rdev,
2810 rdev->sb_start, rdev->sb_size,
2812 pr_debug("md: (write) %s's sb offset: %llu\n",
2813 bdevname(rdev->bdev, b),
2814 (unsigned long long)rdev->sb_start);
2815 rdev->sb_events = mddev->events;
2816 if (rdev->badblocks.size) {
2817 md_super_write(mddev, rdev,
2818 rdev->badblocks.sector,
2819 rdev->badblocks.size << 9,
2821 rdev->badblocks.size = 0;
2825 pr_debug("md: %s (skipping faulty)\n",
2826 bdevname(rdev->bdev, b));
2828 if (mddev->level == LEVEL_MULTIPATH)
2829 /* only need to write one superblock... */
2832 if (md_super_wait(mddev) < 0)
2834 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2836 if (mddev_is_clustered(mddev) && ret == 0)
2837 md_cluster_ops->metadata_update_finish(mddev);
2839 if (mddev->in_sync != sync_req ||
2840 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2841 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2842 /* have to write it out again */
2844 wake_up(&mddev->sb_wait);
2845 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2846 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2848 rdev_for_each(rdev, mddev) {
2849 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2850 clear_bit(Blocked, &rdev->flags);
2852 if (any_badblocks_changed)
2853 ack_all_badblocks(&rdev->badblocks);
2854 clear_bit(BlockedBadBlocks, &rdev->flags);
2855 wake_up(&rdev->blocked_wait);
2858 EXPORT_SYMBOL(md_update_sb);
2860 static int add_bound_rdev(struct md_rdev *rdev)
2862 struct mddev *mddev = rdev->mddev;
2864 bool add_journal = test_bit(Journal, &rdev->flags);
2866 if (!mddev->pers->hot_remove_disk || add_journal) {
2867 /* If there is hot_add_disk but no hot_remove_disk
2868 * then added disks for geometry changes,
2869 * and should be added immediately.
2871 super_types[mddev->major_version].
2872 validate_super(mddev, rdev);
2874 mddev_suspend(mddev);
2875 err = mddev->pers->hot_add_disk(mddev, rdev);
2877 mddev_resume(mddev);
2879 md_kick_rdev_from_array(rdev);
2883 sysfs_notify_dirent_safe(rdev->sysfs_state);
2885 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2886 if (mddev->degraded)
2887 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2888 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2890 md_wakeup_thread(mddev->thread);
2894 /* words written to sysfs files may, or may not, be \n terminated.
2895 * We want to accept with case. For this we use cmd_match.
2897 static int cmd_match(const char *cmd, const char *str)
2899 /* See if cmd, written into a sysfs file, matches
2900 * str. They must either be the same, or cmd can
2901 * have a trailing newline
2903 while (*cmd && *str && *cmd == *str) {
2914 struct rdev_sysfs_entry {
2915 struct attribute attr;
2916 ssize_t (*show)(struct md_rdev *, char *);
2917 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2921 state_show(struct md_rdev *rdev, char *page)
2925 unsigned long flags = READ_ONCE(rdev->flags);
2927 if (test_bit(Faulty, &flags) ||
2928 (!test_bit(ExternalBbl, &flags) &&
2929 rdev->badblocks.unacked_exist))
2930 len += sprintf(page+len, "faulty%s", sep);
2931 if (test_bit(In_sync, &flags))
2932 len += sprintf(page+len, "in_sync%s", sep);
2933 if (test_bit(Journal, &flags))
2934 len += sprintf(page+len, "journal%s", sep);
2935 if (test_bit(WriteMostly, &flags))
2936 len += sprintf(page+len, "write_mostly%s", sep);
2937 if (test_bit(Blocked, &flags) ||
2938 (rdev->badblocks.unacked_exist
2939 && !test_bit(Faulty, &flags)))
2940 len += sprintf(page+len, "blocked%s", sep);
2941 if (!test_bit(Faulty, &flags) &&
2942 !test_bit(Journal, &flags) &&
2943 !test_bit(In_sync, &flags))
2944 len += sprintf(page+len, "spare%s", sep);
2945 if (test_bit(WriteErrorSeen, &flags))
2946 len += sprintf(page+len, "write_error%s", sep);
2947 if (test_bit(WantReplacement, &flags))
2948 len += sprintf(page+len, "want_replacement%s", sep);
2949 if (test_bit(Replacement, &flags))
2950 len += sprintf(page+len, "replacement%s", sep);
2951 if (test_bit(ExternalBbl, &flags))
2952 len += sprintf(page+len, "external_bbl%s", sep);
2953 if (test_bit(FailFast, &flags))
2954 len += sprintf(page+len, "failfast%s", sep);
2959 return len+sprintf(page+len, "\n");
2963 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2966 * faulty - simulates an error
2967 * remove - disconnects the device
2968 * writemostly - sets write_mostly
2969 * -writemostly - clears write_mostly
2970 * blocked - sets the Blocked flags
2971 * -blocked - clears the Blocked and possibly simulates an error
2972 * insync - sets Insync providing device isn't active
2973 * -insync - clear Insync for a device with a slot assigned,
2974 * so that it gets rebuilt based on bitmap
2975 * write_error - sets WriteErrorSeen
2976 * -write_error - clears WriteErrorSeen
2977 * {,-}failfast - set/clear FailFast
2980 struct mddev *mddev = rdev->mddev;
2982 bool need_update_sb = false;
2984 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2985 md_error(rdev->mddev, rdev);
2986 if (test_bit(Faulty, &rdev->flags))
2990 } else if (cmd_match(buf, "remove")) {
2991 if (rdev->mddev->pers) {
2992 clear_bit(Blocked, &rdev->flags);
2993 remove_and_add_spares(rdev->mddev, rdev);
2995 if (rdev->raid_disk >= 0)
2999 if (mddev_is_clustered(mddev))
3000 err = md_cluster_ops->remove_disk(mddev, rdev);
3003 md_kick_rdev_from_array(rdev);
3005 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3006 md_wakeup_thread(mddev->thread);
3011 } else if (cmd_match(buf, "writemostly")) {
3012 set_bit(WriteMostly, &rdev->flags);
3013 mddev_create_serial_pool(rdev->mddev, rdev, false);
3014 need_update_sb = true;
3016 } else if (cmd_match(buf, "-writemostly")) {
3017 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3018 clear_bit(WriteMostly, &rdev->flags);
3019 need_update_sb = true;
3021 } else if (cmd_match(buf, "blocked")) {
3022 set_bit(Blocked, &rdev->flags);
3024 } else if (cmd_match(buf, "-blocked")) {
3025 if (!test_bit(Faulty, &rdev->flags) &&
3026 !test_bit(ExternalBbl, &rdev->flags) &&
3027 rdev->badblocks.unacked_exist) {
3028 /* metadata handler doesn't understand badblocks,
3029 * so we need to fail the device
3031 md_error(rdev->mddev, rdev);
3033 clear_bit(Blocked, &rdev->flags);
3034 clear_bit(BlockedBadBlocks, &rdev->flags);
3035 wake_up(&rdev->blocked_wait);
3036 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3037 md_wakeup_thread(rdev->mddev->thread);
3040 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3041 set_bit(In_sync, &rdev->flags);
3043 } else if (cmd_match(buf, "failfast")) {
3044 set_bit(FailFast, &rdev->flags);
3045 need_update_sb = true;
3047 } else if (cmd_match(buf, "-failfast")) {
3048 clear_bit(FailFast, &rdev->flags);
3049 need_update_sb = true;
3051 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3052 !test_bit(Journal, &rdev->flags)) {
3053 if (rdev->mddev->pers == NULL) {
3054 clear_bit(In_sync, &rdev->flags);
3055 rdev->saved_raid_disk = rdev->raid_disk;
3056 rdev->raid_disk = -1;
3059 } else if (cmd_match(buf, "write_error")) {
3060 set_bit(WriteErrorSeen, &rdev->flags);
3062 } else if (cmd_match(buf, "-write_error")) {
3063 clear_bit(WriteErrorSeen, &rdev->flags);
3065 } else if (cmd_match(buf, "want_replacement")) {
3066 /* Any non-spare device that is not a replacement can
3067 * become want_replacement at any time, but we then need to
3068 * check if recovery is needed.
3070 if (rdev->raid_disk >= 0 &&
3071 !test_bit(Journal, &rdev->flags) &&
3072 !test_bit(Replacement, &rdev->flags))
3073 set_bit(WantReplacement, &rdev->flags);
3074 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3075 md_wakeup_thread(rdev->mddev->thread);
3077 } else if (cmd_match(buf, "-want_replacement")) {
3078 /* Clearing 'want_replacement' is always allowed.
3079 * Once replacements starts it is too late though.
3082 clear_bit(WantReplacement, &rdev->flags);
3083 } else if (cmd_match(buf, "replacement")) {
3084 /* Can only set a device as a replacement when array has not
3085 * yet been started. Once running, replacement is automatic
3086 * from spares, or by assigning 'slot'.
3088 if (rdev->mddev->pers)
3091 set_bit(Replacement, &rdev->flags);
3094 } else if (cmd_match(buf, "-replacement")) {
3095 /* Similarly, can only clear Replacement before start */
3096 if (rdev->mddev->pers)
3099 clear_bit(Replacement, &rdev->flags);
3102 } else if (cmd_match(buf, "re-add")) {
3103 if (!rdev->mddev->pers)
3105 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3106 rdev->saved_raid_disk >= 0) {
3107 /* clear_bit is performed _after_ all the devices
3108 * have their local Faulty bit cleared. If any writes
3109 * happen in the meantime in the local node, they
3110 * will land in the local bitmap, which will be synced
3111 * by this node eventually
3113 if (!mddev_is_clustered(rdev->mddev) ||
3114 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3115 clear_bit(Faulty, &rdev->flags);
3116 err = add_bound_rdev(rdev);
3120 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3121 set_bit(ExternalBbl, &rdev->flags);
3122 rdev->badblocks.shift = 0;
3124 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3125 clear_bit(ExternalBbl, &rdev->flags);
3129 md_update_sb(mddev, 1);
3131 sysfs_notify_dirent_safe(rdev->sysfs_state);
3132 return err ? err : len;
3134 static struct rdev_sysfs_entry rdev_state =
3135 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3138 errors_show(struct md_rdev *rdev, char *page)
3140 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3144 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3149 rv = kstrtouint(buf, 10, &n);
3152 atomic_set(&rdev->corrected_errors, n);
3155 static struct rdev_sysfs_entry rdev_errors =
3156 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3159 slot_show(struct md_rdev *rdev, char *page)
3161 if (test_bit(Journal, &rdev->flags))
3162 return sprintf(page, "journal\n");
3163 else if (rdev->raid_disk < 0)
3164 return sprintf(page, "none\n");
3166 return sprintf(page, "%d\n", rdev->raid_disk);
3170 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3175 if (test_bit(Journal, &rdev->flags))
3177 if (strncmp(buf, "none", 4)==0)
3180 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3184 if (rdev->mddev->pers && slot == -1) {
3185 /* Setting 'slot' on an active array requires also
3186 * updating the 'rd%d' link, and communicating
3187 * with the personality with ->hot_*_disk.
3188 * For now we only support removing
3189 * failed/spare devices. This normally happens automatically,
3190 * but not when the metadata is externally managed.
3192 if (rdev->raid_disk == -1)
3194 /* personality does all needed checks */
3195 if (rdev->mddev->pers->hot_remove_disk == NULL)
3197 clear_bit(Blocked, &rdev->flags);
3198 remove_and_add_spares(rdev->mddev, rdev);
3199 if (rdev->raid_disk >= 0)
3201 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3202 md_wakeup_thread(rdev->mddev->thread);
3203 } else if (rdev->mddev->pers) {
3204 /* Activating a spare .. or possibly reactivating
3205 * if we ever get bitmaps working here.
3209 if (rdev->raid_disk != -1)
3212 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3215 if (rdev->mddev->pers->hot_add_disk == NULL)
3218 if (slot >= rdev->mddev->raid_disks &&
3219 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3222 rdev->raid_disk = slot;
3223 if (test_bit(In_sync, &rdev->flags))
3224 rdev->saved_raid_disk = slot;
3226 rdev->saved_raid_disk = -1;
3227 clear_bit(In_sync, &rdev->flags);
3228 clear_bit(Bitmap_sync, &rdev->flags);
3229 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3231 rdev->raid_disk = -1;
3234 sysfs_notify_dirent_safe(rdev->sysfs_state);
3235 /* failure here is OK */;
3236 sysfs_link_rdev(rdev->mddev, rdev);
3237 /* don't wakeup anyone, leave that to userspace. */
3239 if (slot >= rdev->mddev->raid_disks &&
3240 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3242 rdev->raid_disk = slot;
3243 /* assume it is working */
3244 clear_bit(Faulty, &rdev->flags);
3245 clear_bit(WriteMostly, &rdev->flags);
3246 set_bit(In_sync, &rdev->flags);
3247 sysfs_notify_dirent_safe(rdev->sysfs_state);
3252 static struct rdev_sysfs_entry rdev_slot =
3253 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3256 offset_show(struct md_rdev *rdev, char *page)
3258 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3262 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3264 unsigned long long offset;
3265 if (kstrtoull(buf, 10, &offset) < 0)
3267 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3269 if (rdev->sectors && rdev->mddev->external)
3270 /* Must set offset before size, so overlap checks
3273 rdev->data_offset = offset;
3274 rdev->new_data_offset = offset;
3278 static struct rdev_sysfs_entry rdev_offset =
3279 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3281 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3283 return sprintf(page, "%llu\n",
3284 (unsigned long long)rdev->new_data_offset);
3287 static ssize_t new_offset_store(struct md_rdev *rdev,
3288 const char *buf, size_t len)
3290 unsigned long long new_offset;
3291 struct mddev *mddev = rdev->mddev;
3293 if (kstrtoull(buf, 10, &new_offset) < 0)
3296 if (mddev->sync_thread ||
3297 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3299 if (new_offset == rdev->data_offset)
3300 /* reset is always permitted */
3302 else if (new_offset > rdev->data_offset) {
3303 /* must not push array size beyond rdev_sectors */
3304 if (new_offset - rdev->data_offset
3305 + mddev->dev_sectors > rdev->sectors)
3308 /* Metadata worries about other space details. */
3310 /* decreasing the offset is inconsistent with a backwards
3313 if (new_offset < rdev->data_offset &&
3314 mddev->reshape_backwards)
3316 /* Increasing offset is inconsistent with forwards
3317 * reshape. reshape_direction should be set to
3318 * 'backwards' first.
3320 if (new_offset > rdev->data_offset &&
3321 !mddev->reshape_backwards)
3324 if (mddev->pers && mddev->persistent &&
3325 !super_types[mddev->major_version]
3326 .allow_new_offset(rdev, new_offset))
3328 rdev->new_data_offset = new_offset;
3329 if (new_offset > rdev->data_offset)
3330 mddev->reshape_backwards = 1;
3331 else if (new_offset < rdev->data_offset)
3332 mddev->reshape_backwards = 0;
3336 static struct rdev_sysfs_entry rdev_new_offset =
3337 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3340 rdev_size_show(struct md_rdev *rdev, char *page)
3342 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3345 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3347 /* check if two start/length pairs overlap */
3355 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3357 unsigned long long blocks;
3360 if (kstrtoull(buf, 10, &blocks) < 0)
3363 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3364 return -EINVAL; /* sector conversion overflow */
3367 if (new != blocks * 2)
3368 return -EINVAL; /* unsigned long long to sector_t overflow */
3375 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3377 struct mddev *my_mddev = rdev->mddev;
3378 sector_t oldsectors = rdev->sectors;
3381 if (test_bit(Journal, &rdev->flags))
3383 if (strict_blocks_to_sectors(buf, §ors) < 0)
3385 if (rdev->data_offset != rdev->new_data_offset)
3386 return -EINVAL; /* too confusing */
3387 if (my_mddev->pers && rdev->raid_disk >= 0) {
3388 if (my_mddev->persistent) {
3389 sectors = super_types[my_mddev->major_version].
3390 rdev_size_change(rdev, sectors);
3393 } else if (!sectors)
3394 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3396 if (!my_mddev->pers->resize)
3397 /* Cannot change size for RAID0 or Linear etc */
3400 if (sectors < my_mddev->dev_sectors)
3401 return -EINVAL; /* component must fit device */
3403 rdev->sectors = sectors;
3404 if (sectors > oldsectors && my_mddev->external) {
3405 /* Need to check that all other rdevs with the same
3406 * ->bdev do not overlap. 'rcu' is sufficient to walk
3407 * the rdev lists safely.
3408 * This check does not provide a hard guarantee, it
3409 * just helps avoid dangerous mistakes.
3411 struct mddev *mddev;
3413 struct list_head *tmp;
3416 for_each_mddev(mddev, tmp) {
3417 struct md_rdev *rdev2;
3419 rdev_for_each(rdev2, mddev)
3420 if (rdev->bdev == rdev2->bdev &&
3422 overlaps(rdev->data_offset, rdev->sectors,
3435 /* Someone else could have slipped in a size
3436 * change here, but doing so is just silly.
3437 * We put oldsectors back because we *know* it is
3438 * safe, and trust userspace not to race with
3441 rdev->sectors = oldsectors;
3448 static struct rdev_sysfs_entry rdev_size =
3449 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3451 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3453 unsigned long long recovery_start = rdev->recovery_offset;
3455 if (test_bit(In_sync, &rdev->flags) ||
3456 recovery_start == MaxSector)
3457 return sprintf(page, "none\n");
3459 return sprintf(page, "%llu\n", recovery_start);
3462 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3464 unsigned long long recovery_start;
3466 if (cmd_match(buf, "none"))
3467 recovery_start = MaxSector;
3468 else if (kstrtoull(buf, 10, &recovery_start))
3471 if (rdev->mddev->pers &&
3472 rdev->raid_disk >= 0)
3475 rdev->recovery_offset = recovery_start;
3476 if (recovery_start == MaxSector)
3477 set_bit(In_sync, &rdev->flags);
3479 clear_bit(In_sync, &rdev->flags);
3483 static struct rdev_sysfs_entry rdev_recovery_start =
3484 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3486 /* sysfs access to bad-blocks list.
3487 * We present two files.
3488 * 'bad-blocks' lists sector numbers and lengths of ranges that
3489 * are recorded as bad. The list is truncated to fit within
3490 * the one-page limit of sysfs.
3491 * Writing "sector length" to this file adds an acknowledged
3493 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3494 * been acknowledged. Writing to this file adds bad blocks
3495 * without acknowledging them. This is largely for testing.
3497 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3499 return badblocks_show(&rdev->badblocks, page, 0);
3501 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3503 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3504 /* Maybe that ack was all we needed */
3505 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3506 wake_up(&rdev->blocked_wait);
3509 static struct rdev_sysfs_entry rdev_bad_blocks =
3510 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3512 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3514 return badblocks_show(&rdev->badblocks, page, 1);
3516 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3518 return badblocks_store(&rdev->badblocks, page, len, 1);
3520 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3521 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3524 ppl_sector_show(struct md_rdev *rdev, char *page)
3526 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3530 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3532 unsigned long long sector;
3534 if (kstrtoull(buf, 10, §or) < 0)
3536 if (sector != (sector_t)sector)
3539 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3540 rdev->raid_disk >= 0)
3543 if (rdev->mddev->persistent) {
3544 if (rdev->mddev->major_version == 0)
3546 if ((sector > rdev->sb_start &&
3547 sector - rdev->sb_start > S16_MAX) ||
3548 (sector < rdev->sb_start &&
3549 rdev->sb_start - sector > -S16_MIN))
3551 rdev->ppl.offset = sector - rdev->sb_start;
3552 } else if (!rdev->mddev->external) {
3555 rdev->ppl.sector = sector;
3559 static struct rdev_sysfs_entry rdev_ppl_sector =
3560 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3563 ppl_size_show(struct md_rdev *rdev, char *page)
3565 return sprintf(page, "%u\n", rdev->ppl.size);
3569 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3573 if (kstrtouint(buf, 10, &size) < 0)
3576 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3577 rdev->raid_disk >= 0)
3580 if (rdev->mddev->persistent) {
3581 if (rdev->mddev->major_version == 0)
3585 } else if (!rdev->mddev->external) {
3588 rdev->ppl.size = size;
3592 static struct rdev_sysfs_entry rdev_ppl_size =
3593 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3595 static struct attribute *rdev_default_attrs[] = {
3600 &rdev_new_offset.attr,
3602 &rdev_recovery_start.attr,
3603 &rdev_bad_blocks.attr,
3604 &rdev_unack_bad_blocks.attr,
3605 &rdev_ppl_sector.attr,
3606 &rdev_ppl_size.attr,
3610 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3612 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3613 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3619 return entry->show(rdev, page);
3623 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3624 const char *page, size_t length)
3626 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3627 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3629 struct mddev *mddev = rdev->mddev;
3633 if (!capable(CAP_SYS_ADMIN))
3635 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3637 if (rdev->mddev == NULL)
3640 rv = entry->store(rdev, page, length);
3641 mddev_unlock(mddev);
3646 static void rdev_free(struct kobject *ko)
3648 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3651 static const struct sysfs_ops rdev_sysfs_ops = {
3652 .show = rdev_attr_show,
3653 .store = rdev_attr_store,
3655 static struct kobj_type rdev_ktype = {
3656 .release = rdev_free,
3657 .sysfs_ops = &rdev_sysfs_ops,
3658 .default_attrs = rdev_default_attrs,
3661 int md_rdev_init(struct md_rdev *rdev)
3664 rdev->saved_raid_disk = -1;
3665 rdev->raid_disk = -1;
3667 rdev->data_offset = 0;
3668 rdev->new_data_offset = 0;
3669 rdev->sb_events = 0;
3670 rdev->last_read_error = 0;
3671 rdev->sb_loaded = 0;
3672 rdev->bb_page = NULL;
3673 atomic_set(&rdev->nr_pending, 0);
3674 atomic_set(&rdev->read_errors, 0);
3675 atomic_set(&rdev->corrected_errors, 0);
3677 INIT_LIST_HEAD(&rdev->same_set);
3678 init_waitqueue_head(&rdev->blocked_wait);
3680 /* Add space to store bad block list.
3681 * This reserves the space even on arrays where it cannot
3682 * be used - I wonder if that matters
3684 return badblocks_init(&rdev->badblocks, 0);
3686 EXPORT_SYMBOL_GPL(md_rdev_init);
3688 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3690 * mark the device faulty if:
3692 * - the device is nonexistent (zero size)
3693 * - the device has no valid superblock
3695 * a faulty rdev _never_ has rdev->sb set.
3697 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3699 char b[BDEVNAME_SIZE];
3701 struct md_rdev *rdev;
3704 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3706 return ERR_PTR(-ENOMEM);
3708 err = md_rdev_init(rdev);
3711 err = alloc_disk_sb(rdev);
3715 err = lock_rdev(rdev, newdev, super_format == -2);
3719 kobject_init(&rdev->kobj, &rdev_ktype);
3721 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3723 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3724 bdevname(rdev->bdev,b));
3729 if (super_format >= 0) {
3730 err = super_types[super_format].
3731 load_super(rdev, NULL, super_minor);
3732 if (err == -EINVAL) {
3733 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3734 bdevname(rdev->bdev,b),
3735 super_format, super_minor);
3739 pr_warn("md: could not read %s's sb, not importing!\n",
3740 bdevname(rdev->bdev,b));
3750 md_rdev_clear(rdev);
3752 return ERR_PTR(err);
3756 * Check a full RAID array for plausibility
3759 static int analyze_sbs(struct mddev *mddev)
3762 struct md_rdev *rdev, *freshest, *tmp;
3763 char b[BDEVNAME_SIZE];
3766 rdev_for_each_safe(rdev, tmp, mddev)
3767 switch (super_types[mddev->major_version].
3768 load_super(rdev, freshest, mddev->minor_version)) {
3775 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3776 bdevname(rdev->bdev,b));
3777 md_kick_rdev_from_array(rdev);
3780 /* Cannot find a valid fresh disk */
3782 pr_warn("md: cannot find a valid disk\n");
3786 super_types[mddev->major_version].
3787 validate_super(mddev, freshest);
3790 rdev_for_each_safe(rdev, tmp, mddev) {
3791 if (mddev->max_disks &&
3792 (rdev->desc_nr >= mddev->max_disks ||
3793 i > mddev->max_disks)) {
3794 pr_warn("md: %s: %s: only %d devices permitted\n",
3795 mdname(mddev), bdevname(rdev->bdev, b),
3797 md_kick_rdev_from_array(rdev);
3800 if (rdev != freshest) {
3801 if (super_types[mddev->major_version].
3802 validate_super(mddev, rdev)) {
3803 pr_warn("md: kicking non-fresh %s from array!\n",
3804 bdevname(rdev->bdev,b));
3805 md_kick_rdev_from_array(rdev);
3809 if (mddev->level == LEVEL_MULTIPATH) {
3810 rdev->desc_nr = i++;
3811 rdev->raid_disk = rdev->desc_nr;
3812 set_bit(In_sync, &rdev->flags);
3813 } else if (rdev->raid_disk >=
3814 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3815 !test_bit(Journal, &rdev->flags)) {
3816 rdev->raid_disk = -1;
3817 clear_bit(In_sync, &rdev->flags);
3824 /* Read a fixed-point number.
3825 * Numbers in sysfs attributes should be in "standard" units where
3826 * possible, so time should be in seconds.
3827 * However we internally use a a much smaller unit such as
3828 * milliseconds or jiffies.
3829 * This function takes a decimal number with a possible fractional
3830 * component, and produces an integer which is the result of
3831 * multiplying that number by 10^'scale'.
3832 * all without any floating-point arithmetic.
3834 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3836 unsigned long result = 0;
3838 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3841 else if (decimals < scale) {
3844 result = result * 10 + value;
3856 *res = result * int_pow(10, scale - decimals);
3861 safe_delay_show(struct mddev *mddev, char *page)
3863 int msec = (mddev->safemode_delay*1000)/HZ;
3864 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3867 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3871 if (mddev_is_clustered(mddev)) {
3872 pr_warn("md: Safemode is disabled for clustered mode\n");
3876 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3879 mddev->safemode_delay = 0;
3881 unsigned long old_delay = mddev->safemode_delay;
3882 unsigned long new_delay = (msec*HZ)/1000;
3886 mddev->safemode_delay = new_delay;
3887 if (new_delay < old_delay || old_delay == 0)
3888 mod_timer(&mddev->safemode_timer, jiffies+1);
3892 static struct md_sysfs_entry md_safe_delay =
3893 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3896 level_show(struct mddev *mddev, char *page)
3898 struct md_personality *p;
3900 spin_lock(&mddev->lock);
3903 ret = sprintf(page, "%s\n", p->name);
3904 else if (mddev->clevel[0])
3905 ret = sprintf(page, "%s\n", mddev->clevel);
3906 else if (mddev->level != LEVEL_NONE)
3907 ret = sprintf(page, "%d\n", mddev->level);
3910 spin_unlock(&mddev->lock);
3915 level_store(struct mddev *mddev, const char *buf, size_t len)
3920 struct md_personality *pers, *oldpers;
3922 void *priv, *oldpriv;
3923 struct md_rdev *rdev;
3925 if (slen == 0 || slen >= sizeof(clevel))
3928 rv = mddev_lock(mddev);
3932 if (mddev->pers == NULL) {
3933 strncpy(mddev->clevel, buf, slen);
3934 if (mddev->clevel[slen-1] == '\n')
3936 mddev->clevel[slen] = 0;
3937 mddev->level = LEVEL_NONE;
3945 /* request to change the personality. Need to ensure:
3946 * - array is not engaged in resync/recovery/reshape
3947 * - old personality can be suspended
3948 * - new personality will access other array.
3952 if (mddev->sync_thread ||
3953 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3954 mddev->reshape_position != MaxSector ||
3955 mddev->sysfs_active)
3959 if (!mddev->pers->quiesce) {
3960 pr_warn("md: %s: %s does not support online personality change\n",
3961 mdname(mddev), mddev->pers->name);
3965 /* Now find the new personality */
3966 strncpy(clevel, buf, slen);
3967 if (clevel[slen-1] == '\n')
3970 if (kstrtol(clevel, 10, &level))
3973 if (request_module("md-%s", clevel) != 0)
3974 request_module("md-level-%s", clevel);
3975 spin_lock(&pers_lock);
3976 pers = find_pers(level, clevel);
3977 if (!pers || !try_module_get(pers->owner)) {
3978 spin_unlock(&pers_lock);
3979 pr_warn("md: personality %s not loaded\n", clevel);
3983 spin_unlock(&pers_lock);
3985 if (pers == mddev->pers) {
3986 /* Nothing to do! */
3987 module_put(pers->owner);
3991 if (!pers->takeover) {
3992 module_put(pers->owner);
3993 pr_warn("md: %s: %s does not support personality takeover\n",
3994 mdname(mddev), clevel);
3999 rdev_for_each(rdev, mddev)
4000 rdev->new_raid_disk = rdev->raid_disk;
4002 /* ->takeover must set new_* and/or delta_disks
4003 * if it succeeds, and may set them when it fails.
4005 priv = pers->takeover(mddev);
4007 mddev->new_level = mddev->level;
4008 mddev->new_layout = mddev->layout;
4009 mddev->new_chunk_sectors = mddev->chunk_sectors;
4010 mddev->raid_disks -= mddev->delta_disks;
4011 mddev->delta_disks = 0;
4012 mddev->reshape_backwards = 0;
4013 module_put(pers->owner);
4014 pr_warn("md: %s: %s would not accept array\n",
4015 mdname(mddev), clevel);
4020 /* Looks like we have a winner */
4021 mddev_suspend(mddev);
4022 mddev_detach(mddev);
4024 spin_lock(&mddev->lock);
4025 oldpers = mddev->pers;
4026 oldpriv = mddev->private;
4028 mddev->private = priv;
4029 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4030 mddev->level = mddev->new_level;
4031 mddev->layout = mddev->new_layout;
4032 mddev->chunk_sectors = mddev->new_chunk_sectors;
4033 mddev->delta_disks = 0;
4034 mddev->reshape_backwards = 0;
4035 mddev->degraded = 0;
4036 spin_unlock(&mddev->lock);
4038 if (oldpers->sync_request == NULL &&
4040 /* We are converting from a no-redundancy array
4041 * to a redundancy array and metadata is managed
4042 * externally so we need to be sure that writes
4043 * won't block due to a need to transition
4045 * until external management is started.
4048 mddev->safemode_delay = 0;
4049 mddev->safemode = 0;
4052 oldpers->free(mddev, oldpriv);
4054 if (oldpers->sync_request == NULL &&
4055 pers->sync_request != NULL) {
4056 /* need to add the md_redundancy_group */
4057 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4058 pr_warn("md: cannot register extra attributes for %s\n",
4060 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4061 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4062 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4064 if (oldpers->sync_request != NULL &&
4065 pers->sync_request == NULL) {
4066 /* need to remove the md_redundancy_group */
4067 if (mddev->to_remove == NULL)
4068 mddev->to_remove = &md_redundancy_group;
4071 module_put(oldpers->owner);
4073 rdev_for_each(rdev, mddev) {
4074 if (rdev->raid_disk < 0)
4076 if (rdev->new_raid_disk >= mddev->raid_disks)
4077 rdev->new_raid_disk = -1;
4078 if (rdev->new_raid_disk == rdev->raid_disk)
4080 sysfs_unlink_rdev(mddev, rdev);
4082 rdev_for_each(rdev, mddev) {
4083 if (rdev->raid_disk < 0)
4085 if (rdev->new_raid_disk == rdev->raid_disk)
4087 rdev->raid_disk = rdev->new_raid_disk;
4088 if (rdev->raid_disk < 0)
4089 clear_bit(In_sync, &rdev->flags);
4091 if (sysfs_link_rdev(mddev, rdev))
4092 pr_warn("md: cannot register rd%d for %s after level change\n",
4093 rdev->raid_disk, mdname(mddev));
4097 if (pers->sync_request == NULL) {
4098 /* this is now an array without redundancy, so
4099 * it must always be in_sync
4102 del_timer_sync(&mddev->safemode_timer);
4104 blk_set_stacking_limits(&mddev->queue->limits);
4106 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4107 mddev_resume(mddev);
4109 md_update_sb(mddev, 1);
4110 sysfs_notify_dirent_safe(mddev->sysfs_level);
4114 mddev_unlock(mddev);
4118 static struct md_sysfs_entry md_level =
4119 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4122 layout_show(struct mddev *mddev, char *page)
4124 /* just a number, not meaningful for all levels */
4125 if (mddev->reshape_position != MaxSector &&
4126 mddev->layout != mddev->new_layout)
4127 return sprintf(page, "%d (%d)\n",
4128 mddev->new_layout, mddev->layout);
4129 return sprintf(page, "%d\n", mddev->layout);
4133 layout_store(struct mddev *mddev, const char *buf, size_t len)
4138 err = kstrtouint(buf, 10, &n);
4141 err = mddev_lock(mddev);
4146 if (mddev->pers->check_reshape == NULL)
4151 mddev->new_layout = n;
4152 err = mddev->pers->check_reshape(mddev);
4154 mddev->new_layout = mddev->layout;
4157 mddev->new_layout = n;
4158 if (mddev->reshape_position == MaxSector)
4161 mddev_unlock(mddev);
4164 static struct md_sysfs_entry md_layout =
4165 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4168 raid_disks_show(struct mddev *mddev, char *page)
4170 if (mddev->raid_disks == 0)
4172 if (mddev->reshape_position != MaxSector &&
4173 mddev->delta_disks != 0)
4174 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4175 mddev->raid_disks - mddev->delta_disks);
4176 return sprintf(page, "%d\n", mddev->raid_disks);
4179 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4182 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4187 err = kstrtouint(buf, 10, &n);
4191 err = mddev_lock(mddev);
4195 err = update_raid_disks(mddev, n);
4196 else if (mddev->reshape_position != MaxSector) {
4197 struct md_rdev *rdev;
4198 int olddisks = mddev->raid_disks - mddev->delta_disks;
4201 rdev_for_each(rdev, mddev) {
4203 rdev->data_offset < rdev->new_data_offset)
4206 rdev->data_offset > rdev->new_data_offset)
4210 mddev->delta_disks = n - olddisks;
4211 mddev->raid_disks = n;
4212 mddev->reshape_backwards = (mddev->delta_disks < 0);
4214 mddev->raid_disks = n;
4216 mddev_unlock(mddev);
4217 return err ? err : len;
4219 static struct md_sysfs_entry md_raid_disks =
4220 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4223 uuid_show(struct mddev *mddev, char *page)
4225 return sprintf(page, "%pU\n", mddev->uuid);
4227 static struct md_sysfs_entry md_uuid =
4228 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4231 chunk_size_show(struct mddev *mddev, char *page)
4233 if (mddev->reshape_position != MaxSector &&
4234 mddev->chunk_sectors != mddev->new_chunk_sectors)
4235 return sprintf(page, "%d (%d)\n",
4236 mddev->new_chunk_sectors << 9,
4237 mddev->chunk_sectors << 9);
4238 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4242 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4247 err = kstrtoul(buf, 10, &n);
4251 err = mddev_lock(mddev);
4255 if (mddev->pers->check_reshape == NULL)
4260 mddev->new_chunk_sectors = n >> 9;
4261 err = mddev->pers->check_reshape(mddev);
4263 mddev->new_chunk_sectors = mddev->chunk_sectors;
4266 mddev->new_chunk_sectors = n >> 9;
4267 if (mddev->reshape_position == MaxSector)
4268 mddev->chunk_sectors = n >> 9;
4270 mddev_unlock(mddev);
4273 static struct md_sysfs_entry md_chunk_size =
4274 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4277 resync_start_show(struct mddev *mddev, char *page)
4279 if (mddev->recovery_cp == MaxSector)
4280 return sprintf(page, "none\n");
4281 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4285 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4287 unsigned long long n;
4290 if (cmd_match(buf, "none"))
4293 err = kstrtoull(buf, 10, &n);
4296 if (n != (sector_t)n)
4300 err = mddev_lock(mddev);
4303 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4307 mddev->recovery_cp = n;
4309 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4311 mddev_unlock(mddev);
4314 static struct md_sysfs_entry md_resync_start =
4315 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4316 resync_start_show, resync_start_store);
4319 * The array state can be:
4322 * No devices, no size, no level
4323 * Equivalent to STOP_ARRAY ioctl
4325 * May have some settings, but array is not active
4326 * all IO results in error
4327 * When written, doesn't tear down array, but just stops it
4328 * suspended (not supported yet)
4329 * All IO requests will block. The array can be reconfigured.
4330 * Writing this, if accepted, will block until array is quiescent
4332 * no resync can happen. no superblocks get written.
4333 * write requests fail
4335 * like readonly, but behaves like 'clean' on a write request.
4337 * clean - no pending writes, but otherwise active.
4338 * When written to inactive array, starts without resync
4339 * If a write request arrives then
4340 * if metadata is known, mark 'dirty' and switch to 'active'.
4341 * if not known, block and switch to write-pending
4342 * If written to an active array that has pending writes, then fails.
4344 * fully active: IO and resync can be happening.
4345 * When written to inactive array, starts with resync
4348 * clean, but writes are blocked waiting for 'active' to be written.
4351 * like active, but no writes have been seen for a while (100msec).
4354 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4355 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4356 * when a member is gone, so this state will at least alert the
4357 * user that something is wrong.
4359 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4360 write_pending, active_idle, broken, bad_word};
4361 static char *array_states[] = {
4362 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4363 "write-pending", "active-idle", "broken", NULL };
4365 static int match_word(const char *word, char **list)
4368 for (n=0; list[n]; n++)
4369 if (cmd_match(word, list[n]))
4375 array_state_show(struct mddev *mddev, char *page)
4377 enum array_state st = inactive;
4379 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4388 spin_lock(&mddev->lock);
4389 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4391 else if (mddev->in_sync)
4393 else if (mddev->safemode)
4397 spin_unlock(&mddev->lock);
4400 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4403 if (list_empty(&mddev->disks) &&
4404 mddev->raid_disks == 0 &&
4405 mddev->dev_sectors == 0)
4410 return sprintf(page, "%s\n", array_states[st]);
4413 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4414 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4415 static int restart_array(struct mddev *mddev);
4418 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4421 enum array_state st = match_word(buf, array_states);
4423 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4424 /* don't take reconfig_mutex when toggling between
4427 spin_lock(&mddev->lock);
4429 restart_array(mddev);
4430 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4431 md_wakeup_thread(mddev->thread);
4432 wake_up(&mddev->sb_wait);
4433 } else /* st == clean */ {
4434 restart_array(mddev);
4435 if (!set_in_sync(mddev))
4439 sysfs_notify_dirent_safe(mddev->sysfs_state);
4440 spin_unlock(&mddev->lock);
4443 err = mddev_lock(mddev);
4451 /* stopping an active array */
4452 err = do_md_stop(mddev, 0, NULL);
4455 /* stopping an active array */
4457 err = do_md_stop(mddev, 2, NULL);
4459 err = 0; /* already inactive */
4462 break; /* not supported yet */
4465 err = md_set_readonly(mddev, NULL);
4468 set_disk_ro(mddev->gendisk, 1);
4469 err = do_md_run(mddev);
4475 err = md_set_readonly(mddev, NULL);
4476 else if (mddev->ro == 1)
4477 err = restart_array(mddev);
4480 set_disk_ro(mddev->gendisk, 0);
4484 err = do_md_run(mddev);
4489 err = restart_array(mddev);
4492 spin_lock(&mddev->lock);
4493 if (!set_in_sync(mddev))
4495 spin_unlock(&mddev->lock);
4501 err = restart_array(mddev);
4504 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4505 wake_up(&mddev->sb_wait);
4509 set_disk_ro(mddev->gendisk, 0);
4510 err = do_md_run(mddev);
4516 /* these cannot be set */
4521 if (mddev->hold_active == UNTIL_IOCTL)
4522 mddev->hold_active = 0;
4523 sysfs_notify_dirent_safe(mddev->sysfs_state);
4525 mddev_unlock(mddev);
4528 static struct md_sysfs_entry md_array_state =
4529 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4532 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4533 return sprintf(page, "%d\n",
4534 atomic_read(&mddev->max_corr_read_errors));
4538 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4543 rv = kstrtouint(buf, 10, &n);
4546 atomic_set(&mddev->max_corr_read_errors, n);
4550 static struct md_sysfs_entry max_corr_read_errors =
4551 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4552 max_corrected_read_errors_store);
4555 null_show(struct mddev *mddev, char *page)
4560 /* need to ensure rdev_delayed_delete() has completed */
4561 static void flush_rdev_wq(struct mddev *mddev)
4563 struct md_rdev *rdev;
4566 rdev_for_each_rcu(rdev, mddev)
4567 if (work_pending(&rdev->del_work)) {
4568 flush_workqueue(md_rdev_misc_wq);
4575 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4577 /* buf must be %d:%d\n? giving major and minor numbers */
4578 /* The new device is added to the array.
4579 * If the array has a persistent superblock, we read the
4580 * superblock to initialise info and check validity.
4581 * Otherwise, only checking done is that in bind_rdev_to_array,
4582 * which mainly checks size.
4585 int major = simple_strtoul(buf, &e, 10);
4588 struct md_rdev *rdev;
4591 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4593 minor = simple_strtoul(e+1, &e, 10);
4594 if (*e && *e != '\n')
4596 dev = MKDEV(major, minor);
4597 if (major != MAJOR(dev) ||
4598 minor != MINOR(dev))
4601 flush_rdev_wq(mddev);
4602 err = mddev_lock(mddev);
4605 if (mddev->persistent) {
4606 rdev = md_import_device(dev, mddev->major_version,
4607 mddev->minor_version);
4608 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4609 struct md_rdev *rdev0
4610 = list_entry(mddev->disks.next,
4611 struct md_rdev, same_set);
4612 err = super_types[mddev->major_version]
4613 .load_super(rdev, rdev0, mddev->minor_version);
4617 } else if (mddev->external)
4618 rdev = md_import_device(dev, -2, -1);
4620 rdev = md_import_device(dev, -1, -1);
4623 mddev_unlock(mddev);
4624 return PTR_ERR(rdev);
4626 err = bind_rdev_to_array(rdev, mddev);
4630 mddev_unlock(mddev);
4633 return err ? err : len;
4636 static struct md_sysfs_entry md_new_device =
4637 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4640 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4643 unsigned long chunk, end_chunk;
4646 err = mddev_lock(mddev);
4651 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4653 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4654 if (buf == end) break;
4655 if (*end == '-') { /* range */
4657 end_chunk = simple_strtoul(buf, &end, 0);
4658 if (buf == end) break;
4660 if (*end && !isspace(*end)) break;
4661 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4662 buf = skip_spaces(end);
4664 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4666 mddev_unlock(mddev);
4670 static struct md_sysfs_entry md_bitmap =
4671 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4674 size_show(struct mddev *mddev, char *page)
4676 return sprintf(page, "%llu\n",
4677 (unsigned long long)mddev->dev_sectors / 2);
4680 static int update_size(struct mddev *mddev, sector_t num_sectors);
4683 size_store(struct mddev *mddev, const char *buf, size_t len)
4685 /* If array is inactive, we can reduce the component size, but
4686 * not increase it (except from 0).
4687 * If array is active, we can try an on-line resize
4690 int err = strict_blocks_to_sectors(buf, §ors);
4694 err = mddev_lock(mddev);
4698 err = update_size(mddev, sectors);
4700 md_update_sb(mddev, 1);
4702 if (mddev->dev_sectors == 0 ||
4703 mddev->dev_sectors > sectors)
4704 mddev->dev_sectors = sectors;
4708 mddev_unlock(mddev);
4709 return err ? err : len;
4712 static struct md_sysfs_entry md_size =
4713 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4715 /* Metadata version.
4717 * 'none' for arrays with no metadata (good luck...)
4718 * 'external' for arrays with externally managed metadata,
4719 * or N.M for internally known formats
4722 metadata_show(struct mddev *mddev, char *page)
4724 if (mddev->persistent)
4725 return sprintf(page, "%d.%d\n",
4726 mddev->major_version, mddev->minor_version);
4727 else if (mddev->external)
4728 return sprintf(page, "external:%s\n", mddev->metadata_type);
4730 return sprintf(page, "none\n");
4734 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4739 /* Changing the details of 'external' metadata is
4740 * always permitted. Otherwise there must be
4741 * no devices attached to the array.
4744 err = mddev_lock(mddev);
4748 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4750 else if (!list_empty(&mddev->disks))
4754 if (cmd_match(buf, "none")) {
4755 mddev->persistent = 0;
4756 mddev->external = 0;
4757 mddev->major_version = 0;
4758 mddev->minor_version = 90;
4761 if (strncmp(buf, "external:", 9) == 0) {
4762 size_t namelen = len-9;
4763 if (namelen >= sizeof(mddev->metadata_type))
4764 namelen = sizeof(mddev->metadata_type)-1;
4765 strncpy(mddev->metadata_type, buf+9, namelen);
4766 mddev->metadata_type[namelen] = 0;
4767 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4768 mddev->metadata_type[--namelen] = 0;
4769 mddev->persistent = 0;
4770 mddev->external = 1;
4771 mddev->major_version = 0;
4772 mddev->minor_version = 90;
4775 major = simple_strtoul(buf, &e, 10);
4777 if (e==buf || *e != '.')
4780 minor = simple_strtoul(buf, &e, 10);
4781 if (e==buf || (*e && *e != '\n') )
4784 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4786 mddev->major_version = major;
4787 mddev->minor_version = minor;
4788 mddev->persistent = 1;
4789 mddev->external = 0;
4792 mddev_unlock(mddev);
4796 static struct md_sysfs_entry md_metadata =
4797 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4800 action_show(struct mddev *mddev, char *page)
4802 char *type = "idle";
4803 unsigned long recovery = mddev->recovery;
4804 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4806 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4807 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4808 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4810 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4811 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4813 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4817 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4819 else if (mddev->reshape_position != MaxSector)
4822 return sprintf(page, "%s\n", type);
4826 action_store(struct mddev *mddev, const char *page, size_t len)
4828 if (!mddev->pers || !mddev->pers->sync_request)
4832 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4833 if (cmd_match(page, "frozen"))
4834 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4836 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4837 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4838 mddev_lock(mddev) == 0) {
4839 if (work_pending(&mddev->del_work))
4840 flush_workqueue(md_misc_wq);
4841 if (mddev->sync_thread) {
4842 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4843 md_reap_sync_thread(mddev);
4845 mddev_unlock(mddev);
4847 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4849 else if (cmd_match(page, "resync"))
4850 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4851 else if (cmd_match(page, "recover")) {
4852 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4853 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4854 } else if (cmd_match(page, "reshape")) {
4856 if (mddev->pers->start_reshape == NULL)
4858 err = mddev_lock(mddev);
4860 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4863 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4864 err = mddev->pers->start_reshape(mddev);
4866 mddev_unlock(mddev);
4870 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4872 if (cmd_match(page, "check"))
4873 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4874 else if (!cmd_match(page, "repair"))
4876 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4877 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4878 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4880 if (mddev->ro == 2) {
4881 /* A write to sync_action is enough to justify
4882 * canceling read-auto mode
4885 md_wakeup_thread(mddev->sync_thread);
4887 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4888 md_wakeup_thread(mddev->thread);
4889 sysfs_notify_dirent_safe(mddev->sysfs_action);
4893 static struct md_sysfs_entry md_scan_mode =
4894 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4897 last_sync_action_show(struct mddev *mddev, char *page)
4899 return sprintf(page, "%s\n", mddev->last_sync_action);
4902 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4905 mismatch_cnt_show(struct mddev *mddev, char *page)
4907 return sprintf(page, "%llu\n",
4908 (unsigned long long)
4909 atomic64_read(&mddev->resync_mismatches));
4912 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4915 sync_min_show(struct mddev *mddev, char *page)
4917 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4918 mddev->sync_speed_min ? "local": "system");
4922 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4927 if (strncmp(buf, "system", 6)==0) {
4930 rv = kstrtouint(buf, 10, &min);
4936 mddev->sync_speed_min = min;
4940 static struct md_sysfs_entry md_sync_min =
4941 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4944 sync_max_show(struct mddev *mddev, char *page)
4946 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4947 mddev->sync_speed_max ? "local": "system");
4951 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4956 if (strncmp(buf, "system", 6)==0) {
4959 rv = kstrtouint(buf, 10, &max);
4965 mddev->sync_speed_max = max;
4969 static struct md_sysfs_entry md_sync_max =
4970 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4973 degraded_show(struct mddev *mddev, char *page)
4975 return sprintf(page, "%d\n", mddev->degraded);
4977 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4980 sync_force_parallel_show(struct mddev *mddev, char *page)
4982 return sprintf(page, "%d\n", mddev->parallel_resync);
4986 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4990 if (kstrtol(buf, 10, &n))
4993 if (n != 0 && n != 1)
4996 mddev->parallel_resync = n;
4998 if (mddev->sync_thread)
4999 wake_up(&resync_wait);
5004 /* force parallel resync, even with shared block devices */
5005 static struct md_sysfs_entry md_sync_force_parallel =
5006 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5007 sync_force_parallel_show, sync_force_parallel_store);
5010 sync_speed_show(struct mddev *mddev, char *page)
5012 unsigned long resync, dt, db;
5013 if (mddev->curr_resync == 0)
5014 return sprintf(page, "none\n");
5015 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5016 dt = (jiffies - mddev->resync_mark) / HZ;
5018 db = resync - mddev->resync_mark_cnt;
5019 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5022 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5025 sync_completed_show(struct mddev *mddev, char *page)
5027 unsigned long long max_sectors, resync;
5029 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5030 return sprintf(page, "none\n");
5032 if (mddev->curr_resync == 1 ||
5033 mddev->curr_resync == 2)
5034 return sprintf(page, "delayed\n");
5036 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5037 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5038 max_sectors = mddev->resync_max_sectors;
5040 max_sectors = mddev->dev_sectors;
5042 resync = mddev->curr_resync_completed;
5043 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5046 static struct md_sysfs_entry md_sync_completed =
5047 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5050 min_sync_show(struct mddev *mddev, char *page)
5052 return sprintf(page, "%llu\n",
5053 (unsigned long long)mddev->resync_min);
5056 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5058 unsigned long long min;
5061 if (kstrtoull(buf, 10, &min))
5064 spin_lock(&mddev->lock);
5066 if (min > mddev->resync_max)
5070 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5073 /* Round down to multiple of 4K for safety */
5074 mddev->resync_min = round_down(min, 8);
5078 spin_unlock(&mddev->lock);
5082 static struct md_sysfs_entry md_min_sync =
5083 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5086 max_sync_show(struct mddev *mddev, char *page)
5088 if (mddev->resync_max == MaxSector)
5089 return sprintf(page, "max\n");
5091 return sprintf(page, "%llu\n",
5092 (unsigned long long)mddev->resync_max);
5095 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5098 spin_lock(&mddev->lock);
5099 if (strncmp(buf, "max", 3) == 0)
5100 mddev->resync_max = MaxSector;
5102 unsigned long long max;
5106 if (kstrtoull(buf, 10, &max))
5108 if (max < mddev->resync_min)
5112 if (max < mddev->resync_max &&
5114 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5117 /* Must be a multiple of chunk_size */
5118 chunk = mddev->chunk_sectors;
5120 sector_t temp = max;
5123 if (sector_div(temp, chunk))
5126 mddev->resync_max = max;
5128 wake_up(&mddev->recovery_wait);
5131 spin_unlock(&mddev->lock);
5135 static struct md_sysfs_entry md_max_sync =
5136 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5139 suspend_lo_show(struct mddev *mddev, char *page)
5141 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5145 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5147 unsigned long long new;
5150 err = kstrtoull(buf, 10, &new);
5153 if (new != (sector_t)new)
5156 err = mddev_lock(mddev);
5160 if (mddev->pers == NULL ||
5161 mddev->pers->quiesce == NULL)
5163 mddev_suspend(mddev);
5164 mddev->suspend_lo = new;
5165 mddev_resume(mddev);
5169 mddev_unlock(mddev);
5172 static struct md_sysfs_entry md_suspend_lo =
5173 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5176 suspend_hi_show(struct mddev *mddev, char *page)
5178 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5182 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5184 unsigned long long new;
5187 err = kstrtoull(buf, 10, &new);
5190 if (new != (sector_t)new)
5193 err = mddev_lock(mddev);
5197 if (mddev->pers == NULL)
5200 mddev_suspend(mddev);
5201 mddev->suspend_hi = new;
5202 mddev_resume(mddev);
5206 mddev_unlock(mddev);
5209 static struct md_sysfs_entry md_suspend_hi =
5210 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5213 reshape_position_show(struct mddev *mddev, char *page)
5215 if (mddev->reshape_position != MaxSector)
5216 return sprintf(page, "%llu\n",
5217 (unsigned long long)mddev->reshape_position);
5218 strcpy(page, "none\n");
5223 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5225 struct md_rdev *rdev;
5226 unsigned long long new;
5229 err = kstrtoull(buf, 10, &new);
5232 if (new != (sector_t)new)
5234 err = mddev_lock(mddev);
5240 mddev->reshape_position = new;
5241 mddev->delta_disks = 0;
5242 mddev->reshape_backwards = 0;
5243 mddev->new_level = mddev->level;
5244 mddev->new_layout = mddev->layout;
5245 mddev->new_chunk_sectors = mddev->chunk_sectors;
5246 rdev_for_each(rdev, mddev)
5247 rdev->new_data_offset = rdev->data_offset;
5250 mddev_unlock(mddev);
5254 static struct md_sysfs_entry md_reshape_position =
5255 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5256 reshape_position_store);
5259 reshape_direction_show(struct mddev *mddev, char *page)
5261 return sprintf(page, "%s\n",
5262 mddev->reshape_backwards ? "backwards" : "forwards");
5266 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5271 if (cmd_match(buf, "forwards"))
5273 else if (cmd_match(buf, "backwards"))
5277 if (mddev->reshape_backwards == backwards)
5280 err = mddev_lock(mddev);
5283 /* check if we are allowed to change */
5284 if (mddev->delta_disks)
5286 else if (mddev->persistent &&
5287 mddev->major_version == 0)
5290 mddev->reshape_backwards = backwards;
5291 mddev_unlock(mddev);
5295 static struct md_sysfs_entry md_reshape_direction =
5296 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5297 reshape_direction_store);
5300 array_size_show(struct mddev *mddev, char *page)
5302 if (mddev->external_size)
5303 return sprintf(page, "%llu\n",
5304 (unsigned long long)mddev->array_sectors/2);
5306 return sprintf(page, "default\n");
5310 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5315 err = mddev_lock(mddev);
5319 /* cluster raid doesn't support change array_sectors */
5320 if (mddev_is_clustered(mddev)) {
5321 mddev_unlock(mddev);
5325 if (strncmp(buf, "default", 7) == 0) {
5327 sectors = mddev->pers->size(mddev, 0, 0);
5329 sectors = mddev->array_sectors;
5331 mddev->external_size = 0;
5333 if (strict_blocks_to_sectors(buf, §ors) < 0)
5335 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5338 mddev->external_size = 1;
5342 mddev->array_sectors = sectors;
5344 set_capacity_and_notify(mddev->gendisk,
5345 mddev->array_sectors);
5347 mddev_unlock(mddev);
5351 static struct md_sysfs_entry md_array_size =
5352 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5356 consistency_policy_show(struct mddev *mddev, char *page)
5360 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5361 ret = sprintf(page, "journal\n");
5362 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5363 ret = sprintf(page, "ppl\n");
5364 } else if (mddev->bitmap) {
5365 ret = sprintf(page, "bitmap\n");
5366 } else if (mddev->pers) {
5367 if (mddev->pers->sync_request)
5368 ret = sprintf(page, "resync\n");
5370 ret = sprintf(page, "none\n");
5372 ret = sprintf(page, "unknown\n");
5379 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5384 if (mddev->pers->change_consistency_policy)
5385 err = mddev->pers->change_consistency_policy(mddev, buf);
5388 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5389 set_bit(MD_HAS_PPL, &mddev->flags);
5394 return err ? err : len;
5397 static struct md_sysfs_entry md_consistency_policy =
5398 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5399 consistency_policy_store);
5401 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5403 return sprintf(page, "%d\n", mddev->fail_last_dev);
5407 * Setting fail_last_dev to true to allow last device to be forcibly removed
5408 * from RAID1/RAID10.
5411 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5416 ret = kstrtobool(buf, &value);
5420 if (value != mddev->fail_last_dev)
5421 mddev->fail_last_dev = value;
5425 static struct md_sysfs_entry md_fail_last_dev =
5426 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5427 fail_last_dev_store);
5429 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5431 if (mddev->pers == NULL || (mddev->pers->level != 1))
5432 return sprintf(page, "n/a\n");
5434 return sprintf(page, "%d\n", mddev->serialize_policy);
5438 * Setting serialize_policy to true to enforce write IO is not reordered
5442 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5447 err = kstrtobool(buf, &value);
5451 if (value == mddev->serialize_policy)
5454 err = mddev_lock(mddev);
5457 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5458 pr_err("md: serialize_policy is only effective for raid1\n");
5463 mddev_suspend(mddev);
5465 mddev_create_serial_pool(mddev, NULL, true);
5467 mddev_destroy_serial_pool(mddev, NULL, true);
5468 mddev->serialize_policy = value;
5469 mddev_resume(mddev);
5471 mddev_unlock(mddev);
5475 static struct md_sysfs_entry md_serialize_policy =
5476 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5477 serialize_policy_store);
5480 static struct attribute *md_default_attrs[] = {
5483 &md_raid_disks.attr,
5485 &md_chunk_size.attr,
5487 &md_resync_start.attr,
5489 &md_new_device.attr,
5490 &md_safe_delay.attr,
5491 &md_array_state.attr,
5492 &md_reshape_position.attr,
5493 &md_reshape_direction.attr,
5494 &md_array_size.attr,
5495 &max_corr_read_errors.attr,
5496 &md_consistency_policy.attr,
5497 &md_fail_last_dev.attr,
5498 &md_serialize_policy.attr,
5502 static const struct attribute_group md_default_group = {
5503 .attrs = md_default_attrs,
5506 static struct attribute *md_redundancy_attrs[] = {
5508 &md_last_scan_mode.attr,
5509 &md_mismatches.attr,
5512 &md_sync_speed.attr,
5513 &md_sync_force_parallel.attr,
5514 &md_sync_completed.attr,
5517 &md_suspend_lo.attr,
5518 &md_suspend_hi.attr,
5523 static const struct attribute_group md_redundancy_group = {
5525 .attrs = md_redundancy_attrs,
5528 static const struct attribute_group *md_attr_groups[] = {
5535 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5537 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5538 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5543 spin_lock(&all_mddevs_lock);
5544 if (list_empty(&mddev->all_mddevs)) {
5545 spin_unlock(&all_mddevs_lock);
5549 spin_unlock(&all_mddevs_lock);
5551 rv = entry->show(mddev, page);
5557 md_attr_store(struct kobject *kobj, struct attribute *attr,
5558 const char *page, size_t length)
5560 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5561 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5566 if (!capable(CAP_SYS_ADMIN))
5568 spin_lock(&all_mddevs_lock);
5569 if (list_empty(&mddev->all_mddevs)) {
5570 spin_unlock(&all_mddevs_lock);
5574 spin_unlock(&all_mddevs_lock);
5575 rv = entry->store(mddev, page, length);
5580 static void md_free(struct kobject *ko)
5582 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5584 if (mddev->sysfs_state)
5585 sysfs_put(mddev->sysfs_state);
5586 if (mddev->sysfs_level)
5587 sysfs_put(mddev->sysfs_level);
5589 if (mddev->gendisk) {
5590 del_gendisk(mddev->gendisk);
5591 blk_cleanup_disk(mddev->gendisk);
5593 percpu_ref_exit(&mddev->writes_pending);
5595 bioset_exit(&mddev->bio_set);
5596 bioset_exit(&mddev->sync_set);
5597 if (mddev->level != 1 && mddev->level != 10)
5598 bioset_exit(&mddev->io_acct_set);
5602 static const struct sysfs_ops md_sysfs_ops = {
5603 .show = md_attr_show,
5604 .store = md_attr_store,
5606 static struct kobj_type md_ktype = {
5608 .sysfs_ops = &md_sysfs_ops,
5609 .default_groups = md_attr_groups,
5614 static void mddev_delayed_delete(struct work_struct *ws)
5616 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5618 kobject_del(&mddev->kobj);
5619 kobject_put(&mddev->kobj);
5622 static void no_op(struct percpu_ref *r) {}
5624 int mddev_init_writes_pending(struct mddev *mddev)
5626 if (mddev->writes_pending.percpu_count_ptr)
5628 if (percpu_ref_init(&mddev->writes_pending, no_op,
5629 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5631 /* We want to start with the refcount at zero */
5632 percpu_ref_put(&mddev->writes_pending);
5635 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5637 static int md_alloc(dev_t dev, char *name)
5640 * If dev is zero, name is the name of a device to allocate with
5641 * an arbitrary minor number. It will be "md_???"
5642 * If dev is non-zero it must be a device number with a MAJOR of
5643 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5644 * the device is being created by opening a node in /dev.
5645 * If "name" is not NULL, the device is being created by
5646 * writing to /sys/module/md_mod/parameters/new_array.
5648 static DEFINE_MUTEX(disks_mutex);
5649 struct mddev *mddev;
5650 struct gendisk *disk;
5657 * Wait for any previous instance of this device to be completely
5658 * removed (mddev_delayed_delete).
5660 flush_workqueue(md_misc_wq);
5662 mutex_lock(&disks_mutex);
5663 mddev = mddev_alloc(dev);
5664 if (IS_ERR(mddev)) {
5665 mutex_unlock(&disks_mutex);
5666 return PTR_ERR(mddev);
5669 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5670 shift = partitioned ? MdpMinorShift : 0;
5671 unit = MINOR(mddev->unit) >> shift;
5674 /* Need to ensure that 'name' is not a duplicate.
5676 struct mddev *mddev2;
5677 spin_lock(&all_mddevs_lock);
5679 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5680 if (mddev2->gendisk &&
5681 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5682 spin_unlock(&all_mddevs_lock);
5684 goto out_unlock_disks_mutex;
5686 spin_unlock(&all_mddevs_lock);
5690 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5692 mddev->hold_active = UNTIL_STOP;
5695 disk = blk_alloc_disk(NUMA_NO_NODE);
5697 goto out_unlock_disks_mutex;
5699 disk->major = MAJOR(mddev->unit);
5700 disk->first_minor = unit << shift;
5701 disk->minors = 1 << shift;
5703 strcpy(disk->disk_name, name);
5704 else if (partitioned)
5705 sprintf(disk->disk_name, "md_d%d", unit);
5707 sprintf(disk->disk_name, "md%d", unit);
5708 disk->fops = &md_fops;
5709 disk->private_data = mddev;
5711 mddev->queue = disk->queue;
5712 blk_set_stacking_limits(&mddev->queue->limits);
5713 blk_queue_write_cache(mddev->queue, true, true);
5714 /* Allow extended partitions. This makes the
5715 * 'mdp' device redundant, but we can't really
5718 disk->flags |= GENHD_FL_EXT_DEVT;
5719 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5720 mddev->gendisk = disk;
5721 error = add_disk(disk);
5723 goto out_cleanup_disk;
5725 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5727 goto out_del_gendisk;
5729 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5730 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5731 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5732 goto out_unlock_disks_mutex;
5737 blk_cleanup_disk(disk);
5738 out_unlock_disks_mutex:
5739 mutex_unlock(&disks_mutex);
5744 static void md_probe(dev_t dev)
5746 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5749 md_alloc(dev, NULL);
5752 static int add_named_array(const char *val, const struct kernel_param *kp)
5755 * val must be "md_*" or "mdNNN".
5756 * For "md_*" we allocate an array with a large free minor number, and
5757 * set the name to val. val must not already be an active name.
5758 * For "mdNNN" we allocate an array with the minor number NNN
5759 * which must not already be in use.
5761 int len = strlen(val);
5762 char buf[DISK_NAME_LEN];
5763 unsigned long devnum;
5765 while (len && val[len-1] == '\n')
5767 if (len >= DISK_NAME_LEN)
5769 strlcpy(buf, val, len+1);
5770 if (strncmp(buf, "md_", 3) == 0)
5771 return md_alloc(0, buf);
5772 if (strncmp(buf, "md", 2) == 0 &&
5774 kstrtoul(buf+2, 10, &devnum) == 0 &&
5775 devnum <= MINORMASK)
5776 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5781 static void md_safemode_timeout(struct timer_list *t)
5783 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5785 mddev->safemode = 1;
5786 if (mddev->external)
5787 sysfs_notify_dirent_safe(mddev->sysfs_state);
5789 md_wakeup_thread(mddev->thread);
5792 static int start_dirty_degraded;
5794 int md_run(struct mddev *mddev)
5797 struct md_rdev *rdev;
5798 struct md_personality *pers;
5800 if (list_empty(&mddev->disks))
5801 /* cannot run an array with no devices.. */
5806 /* Cannot run until previous stop completes properly */
5807 if (mddev->sysfs_active)
5811 * Analyze all RAID superblock(s)
5813 if (!mddev->raid_disks) {
5814 if (!mddev->persistent)
5816 err = analyze_sbs(mddev);
5821 if (mddev->level != LEVEL_NONE)
5822 request_module("md-level-%d", mddev->level);
5823 else if (mddev->clevel[0])
5824 request_module("md-%s", mddev->clevel);
5827 * Drop all container device buffers, from now on
5828 * the only valid external interface is through the md
5831 mddev->has_superblocks = false;
5832 rdev_for_each(rdev, mddev) {
5833 if (test_bit(Faulty, &rdev->flags))
5835 sync_blockdev(rdev->bdev);
5836 invalidate_bdev(rdev->bdev);
5837 if (mddev->ro != 1 && rdev_read_only(rdev)) {
5840 set_disk_ro(mddev->gendisk, 1);
5844 mddev->has_superblocks = true;
5846 /* perform some consistency tests on the device.
5847 * We don't want the data to overlap the metadata,
5848 * Internal Bitmap issues have been handled elsewhere.
5850 if (rdev->meta_bdev) {
5851 /* Nothing to check */;
5852 } else if (rdev->data_offset < rdev->sb_start) {
5853 if (mddev->dev_sectors &&
5854 rdev->data_offset + mddev->dev_sectors
5856 pr_warn("md: %s: data overlaps metadata\n",
5861 if (rdev->sb_start + rdev->sb_size/512
5862 > rdev->data_offset) {
5863 pr_warn("md: %s: metadata overlaps data\n",
5868 sysfs_notify_dirent_safe(rdev->sysfs_state);
5871 if (!bioset_initialized(&mddev->bio_set)) {
5872 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5876 if (!bioset_initialized(&mddev->sync_set)) {
5877 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5881 if (mddev->level != 1 && mddev->level != 10 &&
5882 !bioset_initialized(&mddev->io_acct_set)) {
5883 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
5884 offsetof(struct md_io_acct, bio_clone), 0);
5889 spin_lock(&pers_lock);
5890 pers = find_pers(mddev->level, mddev->clevel);
5891 if (!pers || !try_module_get(pers->owner)) {
5892 spin_unlock(&pers_lock);
5893 if (mddev->level != LEVEL_NONE)
5894 pr_warn("md: personality for level %d is not loaded!\n",
5897 pr_warn("md: personality for level %s is not loaded!\n",
5902 spin_unlock(&pers_lock);
5903 if (mddev->level != pers->level) {
5904 mddev->level = pers->level;
5905 mddev->new_level = pers->level;
5907 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5909 if (mddev->reshape_position != MaxSector &&
5910 pers->start_reshape == NULL) {
5911 /* This personality cannot handle reshaping... */
5912 module_put(pers->owner);
5917 if (pers->sync_request) {
5918 /* Warn if this is a potentially silly
5921 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5922 struct md_rdev *rdev2;
5925 rdev_for_each(rdev, mddev)
5926 rdev_for_each(rdev2, mddev) {
5928 rdev->bdev->bd_disk ==
5929 rdev2->bdev->bd_disk) {
5930 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5932 bdevname(rdev->bdev,b),
5933 bdevname(rdev2->bdev,b2));
5939 pr_warn("True protection against single-disk failure might be compromised.\n");
5942 mddev->recovery = 0;
5943 /* may be over-ridden by personality */
5944 mddev->resync_max_sectors = mddev->dev_sectors;
5946 mddev->ok_start_degraded = start_dirty_degraded;
5948 if (start_readonly && mddev->ro == 0)
5949 mddev->ro = 2; /* read-only, but switch on first write */
5951 err = pers->run(mddev);
5953 pr_warn("md: pers->run() failed ...\n");
5954 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5955 WARN_ONCE(!mddev->external_size,
5956 "%s: default size too small, but 'external_size' not in effect?\n",
5958 pr_warn("md: invalid array_size %llu > default size %llu\n",
5959 (unsigned long long)mddev->array_sectors / 2,
5960 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5963 if (err == 0 && pers->sync_request &&
5964 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5965 struct bitmap *bitmap;
5967 bitmap = md_bitmap_create(mddev, -1);
5968 if (IS_ERR(bitmap)) {
5969 err = PTR_ERR(bitmap);
5970 pr_warn("%s: failed to create bitmap (%d)\n",
5971 mdname(mddev), err);
5973 mddev->bitmap = bitmap;
5979 if (mddev->bitmap_info.max_write_behind > 0) {
5980 bool create_pool = false;
5982 rdev_for_each(rdev, mddev) {
5983 if (test_bit(WriteMostly, &rdev->flags) &&
5984 rdev_init_serial(rdev))
5987 if (create_pool && mddev->serial_info_pool == NULL) {
5988 mddev->serial_info_pool =
5989 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5990 sizeof(struct serial_info));
5991 if (!mddev->serial_info_pool) {
6001 rdev_for_each(rdev, mddev) {
6002 if (rdev->raid_disk >= 0 &&
6003 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
6008 if (mddev->degraded)
6011 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6013 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6014 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6016 if (pers->sync_request) {
6017 if (mddev->kobj.sd &&
6018 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6019 pr_warn("md: cannot register extra attributes for %s\n",
6021 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6022 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6023 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6024 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6027 atomic_set(&mddev->max_corr_read_errors,
6028 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6029 mddev->safemode = 0;
6030 if (mddev_is_clustered(mddev))
6031 mddev->safemode_delay = 0;
6033 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6036 spin_lock(&mddev->lock);
6038 spin_unlock(&mddev->lock);
6039 rdev_for_each(rdev, mddev)
6040 if (rdev->raid_disk >= 0)
6041 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6043 if (mddev->degraded && !mddev->ro)
6044 /* This ensures that recovering status is reported immediately
6045 * via sysfs - until a lack of spares is confirmed.
6047 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6048 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6050 if (mddev->sb_flags)
6051 md_update_sb(mddev, 0);
6057 mddev_detach(mddev);
6059 pers->free(mddev, mddev->private);
6060 mddev->private = NULL;
6061 module_put(pers->owner);
6062 md_bitmap_destroy(mddev);
6064 if (mddev->level != 1 && mddev->level != 10)
6065 bioset_exit(&mddev->io_acct_set);
6067 bioset_exit(&mddev->sync_set);
6069 bioset_exit(&mddev->bio_set);
6072 EXPORT_SYMBOL_GPL(md_run);
6074 int do_md_run(struct mddev *mddev)
6078 set_bit(MD_NOT_READY, &mddev->flags);
6079 err = md_run(mddev);
6082 err = md_bitmap_load(mddev);
6084 md_bitmap_destroy(mddev);
6088 if (mddev_is_clustered(mddev))
6089 md_allow_write(mddev);
6091 /* run start up tasks that require md_thread */
6094 md_wakeup_thread(mddev->thread);
6095 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6097 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6098 clear_bit(MD_NOT_READY, &mddev->flags);
6100 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6101 sysfs_notify_dirent_safe(mddev->sysfs_state);
6102 sysfs_notify_dirent_safe(mddev->sysfs_action);
6103 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6105 clear_bit(MD_NOT_READY, &mddev->flags);
6109 int md_start(struct mddev *mddev)
6113 if (mddev->pers->start) {
6114 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6115 md_wakeup_thread(mddev->thread);
6116 ret = mddev->pers->start(mddev);
6117 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6118 md_wakeup_thread(mddev->sync_thread);
6122 EXPORT_SYMBOL_GPL(md_start);
6124 static int restart_array(struct mddev *mddev)
6126 struct gendisk *disk = mddev->gendisk;
6127 struct md_rdev *rdev;
6128 bool has_journal = false;
6129 bool has_readonly = false;
6131 /* Complain if it has no devices */
6132 if (list_empty(&mddev->disks))
6140 rdev_for_each_rcu(rdev, mddev) {
6141 if (test_bit(Journal, &rdev->flags) &&
6142 !test_bit(Faulty, &rdev->flags))
6144 if (rdev_read_only(rdev))
6145 has_readonly = true;
6148 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6149 /* Don't restart rw with journal missing/faulty */
6154 mddev->safemode = 0;
6156 set_disk_ro(disk, 0);
6157 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6158 /* Kick recovery or resync if necessary */
6159 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6160 md_wakeup_thread(mddev->thread);
6161 md_wakeup_thread(mddev->sync_thread);
6162 sysfs_notify_dirent_safe(mddev->sysfs_state);
6166 static void md_clean(struct mddev *mddev)
6168 mddev->array_sectors = 0;
6169 mddev->external_size = 0;
6170 mddev->dev_sectors = 0;
6171 mddev->raid_disks = 0;
6172 mddev->recovery_cp = 0;
6173 mddev->resync_min = 0;
6174 mddev->resync_max = MaxSector;
6175 mddev->reshape_position = MaxSector;
6176 mddev->external = 0;
6177 mddev->persistent = 0;
6178 mddev->level = LEVEL_NONE;
6179 mddev->clevel[0] = 0;
6181 mddev->sb_flags = 0;
6183 mddev->metadata_type[0] = 0;
6184 mddev->chunk_sectors = 0;
6185 mddev->ctime = mddev->utime = 0;
6187 mddev->max_disks = 0;
6189 mddev->can_decrease_events = 0;
6190 mddev->delta_disks = 0;
6191 mddev->reshape_backwards = 0;
6192 mddev->new_level = LEVEL_NONE;
6193 mddev->new_layout = 0;
6194 mddev->new_chunk_sectors = 0;
6195 mddev->curr_resync = 0;
6196 atomic64_set(&mddev->resync_mismatches, 0);
6197 mddev->suspend_lo = mddev->suspend_hi = 0;
6198 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6199 mddev->recovery = 0;
6202 mddev->degraded = 0;
6203 mddev->safemode = 0;
6204 mddev->private = NULL;
6205 mddev->cluster_info = NULL;
6206 mddev->bitmap_info.offset = 0;
6207 mddev->bitmap_info.default_offset = 0;
6208 mddev->bitmap_info.default_space = 0;
6209 mddev->bitmap_info.chunksize = 0;
6210 mddev->bitmap_info.daemon_sleep = 0;
6211 mddev->bitmap_info.max_write_behind = 0;
6212 mddev->bitmap_info.nodes = 0;
6215 static void __md_stop_writes(struct mddev *mddev)
6217 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6218 if (work_pending(&mddev->del_work))
6219 flush_workqueue(md_misc_wq);
6220 if (mddev->sync_thread) {
6221 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6222 md_reap_sync_thread(mddev);
6225 del_timer_sync(&mddev->safemode_timer);
6227 if (mddev->pers && mddev->pers->quiesce) {
6228 mddev->pers->quiesce(mddev, 1);
6229 mddev->pers->quiesce(mddev, 0);
6231 md_bitmap_flush(mddev);
6233 if (mddev->ro == 0 &&
6234 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6236 /* mark array as shutdown cleanly */
6237 if (!mddev_is_clustered(mddev))
6239 md_update_sb(mddev, 1);
6241 /* disable policy to guarantee rdevs free resources for serialization */
6242 mddev->serialize_policy = 0;
6243 mddev_destroy_serial_pool(mddev, NULL, true);
6246 void md_stop_writes(struct mddev *mddev)
6248 mddev_lock_nointr(mddev);
6249 __md_stop_writes(mddev);
6250 mddev_unlock(mddev);
6252 EXPORT_SYMBOL_GPL(md_stop_writes);
6254 static void mddev_detach(struct mddev *mddev)
6256 md_bitmap_wait_behind_writes(mddev);
6257 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6258 mddev->pers->quiesce(mddev, 1);
6259 mddev->pers->quiesce(mddev, 0);
6261 md_unregister_thread(&mddev->thread);
6263 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6266 static void __md_stop(struct mddev *mddev)
6268 struct md_personality *pers = mddev->pers;
6269 md_bitmap_destroy(mddev);
6270 mddev_detach(mddev);
6271 /* Ensure ->event_work is done */
6272 if (mddev->event_work.func)
6273 flush_workqueue(md_misc_wq);
6274 spin_lock(&mddev->lock);
6276 spin_unlock(&mddev->lock);
6277 pers->free(mddev, mddev->private);
6278 mddev->private = NULL;
6279 if (pers->sync_request && mddev->to_remove == NULL)
6280 mddev->to_remove = &md_redundancy_group;
6281 module_put(pers->owner);
6282 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6285 void md_stop(struct mddev *mddev)
6287 /* stop the array and free an attached data structures.
6288 * This is called from dm-raid
6291 bioset_exit(&mddev->bio_set);
6292 bioset_exit(&mddev->sync_set);
6293 if (mddev->level != 1 && mddev->level != 10)
6294 bioset_exit(&mddev->io_acct_set);
6297 EXPORT_SYMBOL_GPL(md_stop);
6299 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6304 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6306 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6307 md_wakeup_thread(mddev->thread);
6309 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6310 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6311 if (mddev->sync_thread)
6312 /* Thread might be blocked waiting for metadata update
6313 * which will now never happen */
6314 wake_up_process(mddev->sync_thread->tsk);
6316 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6318 mddev_unlock(mddev);
6319 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6321 wait_event(mddev->sb_wait,
6322 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6323 mddev_lock_nointr(mddev);
6325 mutex_lock(&mddev->open_mutex);
6326 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6327 mddev->sync_thread ||
6328 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6329 pr_warn("md: %s still in use.\n",mdname(mddev));
6331 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6332 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6333 md_wakeup_thread(mddev->thread);
6339 __md_stop_writes(mddev);
6345 set_disk_ro(mddev->gendisk, 1);
6346 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6347 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6348 md_wakeup_thread(mddev->thread);
6349 sysfs_notify_dirent_safe(mddev->sysfs_state);
6353 mutex_unlock(&mddev->open_mutex);
6358 * 0 - completely stop and dis-assemble array
6359 * 2 - stop but do not disassemble array
6361 static int do_md_stop(struct mddev *mddev, int mode,
6362 struct block_device *bdev)
6364 struct gendisk *disk = mddev->gendisk;
6365 struct md_rdev *rdev;
6368 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6370 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6371 md_wakeup_thread(mddev->thread);
6373 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6374 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6375 if (mddev->sync_thread)
6376 /* Thread might be blocked waiting for metadata update
6377 * which will now never happen */
6378 wake_up_process(mddev->sync_thread->tsk);
6380 mddev_unlock(mddev);
6381 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6382 !test_bit(MD_RECOVERY_RUNNING,
6383 &mddev->recovery)));
6384 mddev_lock_nointr(mddev);
6386 mutex_lock(&mddev->open_mutex);
6387 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6388 mddev->sysfs_active ||
6389 mddev->sync_thread ||
6390 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6391 pr_warn("md: %s still in use.\n",mdname(mddev));
6392 mutex_unlock(&mddev->open_mutex);
6394 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6395 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6396 md_wakeup_thread(mddev->thread);
6402 set_disk_ro(disk, 0);
6404 __md_stop_writes(mddev);
6407 /* tell userspace to handle 'inactive' */
6408 sysfs_notify_dirent_safe(mddev->sysfs_state);
6410 rdev_for_each(rdev, mddev)
6411 if (rdev->raid_disk >= 0)
6412 sysfs_unlink_rdev(mddev, rdev);
6414 set_capacity_and_notify(disk, 0);
6415 mutex_unlock(&mddev->open_mutex);
6421 mutex_unlock(&mddev->open_mutex);
6423 * Free resources if final stop
6426 pr_info("md: %s stopped.\n", mdname(mddev));
6428 if (mddev->bitmap_info.file) {
6429 struct file *f = mddev->bitmap_info.file;
6430 spin_lock(&mddev->lock);
6431 mddev->bitmap_info.file = NULL;
6432 spin_unlock(&mddev->lock);
6435 mddev->bitmap_info.offset = 0;
6437 export_array(mddev);
6440 if (mddev->hold_active == UNTIL_STOP)
6441 mddev->hold_active = 0;
6444 sysfs_notify_dirent_safe(mddev->sysfs_state);
6449 static void autorun_array(struct mddev *mddev)
6451 struct md_rdev *rdev;
6454 if (list_empty(&mddev->disks))
6457 pr_info("md: running: ");
6459 rdev_for_each(rdev, mddev) {
6460 char b[BDEVNAME_SIZE];
6461 pr_cont("<%s>", bdevname(rdev->bdev,b));
6465 err = do_md_run(mddev);
6467 pr_warn("md: do_md_run() returned %d\n", err);
6468 do_md_stop(mddev, 0, NULL);
6473 * lets try to run arrays based on all disks that have arrived
6474 * until now. (those are in pending_raid_disks)
6476 * the method: pick the first pending disk, collect all disks with
6477 * the same UUID, remove all from the pending list and put them into
6478 * the 'same_array' list. Then order this list based on superblock
6479 * update time (freshest comes first), kick out 'old' disks and
6480 * compare superblocks. If everything's fine then run it.
6482 * If "unit" is allocated, then bump its reference count
6484 static void autorun_devices(int part)
6486 struct md_rdev *rdev0, *rdev, *tmp;
6487 struct mddev *mddev;
6488 char b[BDEVNAME_SIZE];
6490 pr_info("md: autorun ...\n");
6491 while (!list_empty(&pending_raid_disks)) {
6494 LIST_HEAD(candidates);
6495 rdev0 = list_entry(pending_raid_disks.next,
6496 struct md_rdev, same_set);
6498 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6499 INIT_LIST_HEAD(&candidates);
6500 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6501 if (super_90_load(rdev, rdev0, 0) >= 0) {
6502 pr_debug("md: adding %s ...\n",
6503 bdevname(rdev->bdev,b));
6504 list_move(&rdev->same_set, &candidates);
6507 * now we have a set of devices, with all of them having
6508 * mostly sane superblocks. It's time to allocate the
6512 dev = MKDEV(mdp_major,
6513 rdev0->preferred_minor << MdpMinorShift);
6514 unit = MINOR(dev) >> MdpMinorShift;
6516 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6519 if (rdev0->preferred_minor != unit) {
6520 pr_warn("md: unit number in %s is bad: %d\n",
6521 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6526 mddev = mddev_find(dev);
6530 if (mddev_lock(mddev))
6531 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6532 else if (mddev->raid_disks || mddev->major_version
6533 || !list_empty(&mddev->disks)) {
6534 pr_warn("md: %s already running, cannot run %s\n",
6535 mdname(mddev), bdevname(rdev0->bdev,b));
6536 mddev_unlock(mddev);
6538 pr_debug("md: created %s\n", mdname(mddev));
6539 mddev->persistent = 1;
6540 rdev_for_each_list(rdev, tmp, &candidates) {
6541 list_del_init(&rdev->same_set);
6542 if (bind_rdev_to_array(rdev, mddev))
6545 autorun_array(mddev);
6546 mddev_unlock(mddev);
6548 /* on success, candidates will be empty, on error
6551 rdev_for_each_list(rdev, tmp, &candidates) {
6552 list_del_init(&rdev->same_set);
6557 pr_info("md: ... autorun DONE.\n");
6559 #endif /* !MODULE */
6561 static int get_version(void __user *arg)
6565 ver.major = MD_MAJOR_VERSION;
6566 ver.minor = MD_MINOR_VERSION;
6567 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6569 if (copy_to_user(arg, &ver, sizeof(ver)))
6575 static int get_array_info(struct mddev *mddev, void __user *arg)
6577 mdu_array_info_t info;
6578 int nr,working,insync,failed,spare;
6579 struct md_rdev *rdev;
6581 nr = working = insync = failed = spare = 0;
6583 rdev_for_each_rcu(rdev, mddev) {
6585 if (test_bit(Faulty, &rdev->flags))
6589 if (test_bit(In_sync, &rdev->flags))
6591 else if (test_bit(Journal, &rdev->flags))
6592 /* TODO: add journal count to md_u.h */
6600 info.major_version = mddev->major_version;
6601 info.minor_version = mddev->minor_version;
6602 info.patch_version = MD_PATCHLEVEL_VERSION;
6603 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6604 info.level = mddev->level;
6605 info.size = mddev->dev_sectors / 2;
6606 if (info.size != mddev->dev_sectors / 2) /* overflow */
6609 info.raid_disks = mddev->raid_disks;
6610 info.md_minor = mddev->md_minor;
6611 info.not_persistent= !mddev->persistent;
6613 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6616 info.state = (1<<MD_SB_CLEAN);
6617 if (mddev->bitmap && mddev->bitmap_info.offset)
6618 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6619 if (mddev_is_clustered(mddev))
6620 info.state |= (1<<MD_SB_CLUSTERED);
6621 info.active_disks = insync;
6622 info.working_disks = working;
6623 info.failed_disks = failed;
6624 info.spare_disks = spare;
6626 info.layout = mddev->layout;
6627 info.chunk_size = mddev->chunk_sectors << 9;
6629 if (copy_to_user(arg, &info, sizeof(info)))
6635 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6637 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6641 file = kzalloc(sizeof(*file), GFP_NOIO);
6646 spin_lock(&mddev->lock);
6647 /* bitmap enabled */
6648 if (mddev->bitmap_info.file) {
6649 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6650 sizeof(file->pathname));
6654 memmove(file->pathname, ptr,
6655 sizeof(file->pathname)-(ptr-file->pathname));
6657 spin_unlock(&mddev->lock);
6660 copy_to_user(arg, file, sizeof(*file)))
6667 static int get_disk_info(struct mddev *mddev, void __user * arg)
6669 mdu_disk_info_t info;
6670 struct md_rdev *rdev;
6672 if (copy_from_user(&info, arg, sizeof(info)))
6676 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6678 info.major = MAJOR(rdev->bdev->bd_dev);
6679 info.minor = MINOR(rdev->bdev->bd_dev);
6680 info.raid_disk = rdev->raid_disk;
6682 if (test_bit(Faulty, &rdev->flags))
6683 info.state |= (1<<MD_DISK_FAULTY);
6684 else if (test_bit(In_sync, &rdev->flags)) {
6685 info.state |= (1<<MD_DISK_ACTIVE);
6686 info.state |= (1<<MD_DISK_SYNC);
6688 if (test_bit(Journal, &rdev->flags))
6689 info.state |= (1<<MD_DISK_JOURNAL);
6690 if (test_bit(WriteMostly, &rdev->flags))
6691 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6692 if (test_bit(FailFast, &rdev->flags))
6693 info.state |= (1<<MD_DISK_FAILFAST);
6695 info.major = info.minor = 0;
6696 info.raid_disk = -1;
6697 info.state = (1<<MD_DISK_REMOVED);
6701 if (copy_to_user(arg, &info, sizeof(info)))
6707 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6709 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6710 struct md_rdev *rdev;
6711 dev_t dev = MKDEV(info->major,info->minor);
6713 if (mddev_is_clustered(mddev) &&
6714 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6715 pr_warn("%s: Cannot add to clustered mddev.\n",
6720 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6723 if (!mddev->raid_disks) {
6725 /* expecting a device which has a superblock */
6726 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6728 pr_warn("md: md_import_device returned %ld\n",
6730 return PTR_ERR(rdev);
6732 if (!list_empty(&mddev->disks)) {
6733 struct md_rdev *rdev0
6734 = list_entry(mddev->disks.next,
6735 struct md_rdev, same_set);
6736 err = super_types[mddev->major_version]
6737 .load_super(rdev, rdev0, mddev->minor_version);
6739 pr_warn("md: %s has different UUID to %s\n",
6740 bdevname(rdev->bdev,b),
6741 bdevname(rdev0->bdev,b2));
6746 err = bind_rdev_to_array(rdev, mddev);
6753 * md_add_new_disk can be used once the array is assembled
6754 * to add "hot spares". They must already have a superblock
6759 if (!mddev->pers->hot_add_disk) {
6760 pr_warn("%s: personality does not support diskops!\n",
6764 if (mddev->persistent)
6765 rdev = md_import_device(dev, mddev->major_version,
6766 mddev->minor_version);
6768 rdev = md_import_device(dev, -1, -1);
6770 pr_warn("md: md_import_device returned %ld\n",
6772 return PTR_ERR(rdev);
6774 /* set saved_raid_disk if appropriate */
6775 if (!mddev->persistent) {
6776 if (info->state & (1<<MD_DISK_SYNC) &&
6777 info->raid_disk < mddev->raid_disks) {
6778 rdev->raid_disk = info->raid_disk;
6779 set_bit(In_sync, &rdev->flags);
6780 clear_bit(Bitmap_sync, &rdev->flags);
6782 rdev->raid_disk = -1;
6783 rdev->saved_raid_disk = rdev->raid_disk;
6785 super_types[mddev->major_version].
6786 validate_super(mddev, rdev);
6787 if ((info->state & (1<<MD_DISK_SYNC)) &&
6788 rdev->raid_disk != info->raid_disk) {
6789 /* This was a hot-add request, but events doesn't
6790 * match, so reject it.
6796 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6797 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6798 set_bit(WriteMostly, &rdev->flags);
6800 clear_bit(WriteMostly, &rdev->flags);
6801 if (info->state & (1<<MD_DISK_FAILFAST))
6802 set_bit(FailFast, &rdev->flags);
6804 clear_bit(FailFast, &rdev->flags);
6806 if (info->state & (1<<MD_DISK_JOURNAL)) {
6807 struct md_rdev *rdev2;
6808 bool has_journal = false;
6810 /* make sure no existing journal disk */
6811 rdev_for_each(rdev2, mddev) {
6812 if (test_bit(Journal, &rdev2->flags)) {
6817 if (has_journal || mddev->bitmap) {
6821 set_bit(Journal, &rdev->flags);
6824 * check whether the device shows up in other nodes
6826 if (mddev_is_clustered(mddev)) {
6827 if (info->state & (1 << MD_DISK_CANDIDATE))
6828 set_bit(Candidate, &rdev->flags);
6829 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6830 /* --add initiated by this node */
6831 err = md_cluster_ops->add_new_disk(mddev, rdev);
6839 rdev->raid_disk = -1;
6840 err = bind_rdev_to_array(rdev, mddev);
6845 if (mddev_is_clustered(mddev)) {
6846 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6848 err = md_cluster_ops->new_disk_ack(mddev,
6851 md_kick_rdev_from_array(rdev);
6855 md_cluster_ops->add_new_disk_cancel(mddev);
6857 err = add_bound_rdev(rdev);
6861 err = add_bound_rdev(rdev);
6866 /* otherwise, md_add_new_disk is only allowed
6867 * for major_version==0 superblocks
6869 if (mddev->major_version != 0) {
6870 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6874 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6876 rdev = md_import_device(dev, -1, 0);
6878 pr_warn("md: error, md_import_device() returned %ld\n",
6880 return PTR_ERR(rdev);
6882 rdev->desc_nr = info->number;
6883 if (info->raid_disk < mddev->raid_disks)
6884 rdev->raid_disk = info->raid_disk;
6886 rdev->raid_disk = -1;
6888 if (rdev->raid_disk < mddev->raid_disks)
6889 if (info->state & (1<<MD_DISK_SYNC))
6890 set_bit(In_sync, &rdev->flags);
6892 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6893 set_bit(WriteMostly, &rdev->flags);
6894 if (info->state & (1<<MD_DISK_FAILFAST))
6895 set_bit(FailFast, &rdev->flags);
6897 if (!mddev->persistent) {
6898 pr_debug("md: nonpersistent superblock ...\n");
6899 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6901 rdev->sb_start = calc_dev_sboffset(rdev);
6902 rdev->sectors = rdev->sb_start;
6904 err = bind_rdev_to_array(rdev, mddev);
6914 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6916 char b[BDEVNAME_SIZE];
6917 struct md_rdev *rdev;
6922 rdev = find_rdev(mddev, dev);
6926 if (rdev->raid_disk < 0)
6929 clear_bit(Blocked, &rdev->flags);
6930 remove_and_add_spares(mddev, rdev);
6932 if (rdev->raid_disk >= 0)
6936 if (mddev_is_clustered(mddev)) {
6937 if (md_cluster_ops->remove_disk(mddev, rdev))
6941 md_kick_rdev_from_array(rdev);
6942 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6944 md_wakeup_thread(mddev->thread);
6946 md_update_sb(mddev, 1);
6951 pr_debug("md: cannot remove active disk %s from %s ...\n",
6952 bdevname(rdev->bdev,b), mdname(mddev));
6956 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6958 char b[BDEVNAME_SIZE];
6960 struct md_rdev *rdev;
6965 if (mddev->major_version != 0) {
6966 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6970 if (!mddev->pers->hot_add_disk) {
6971 pr_warn("%s: personality does not support diskops!\n",
6976 rdev = md_import_device(dev, -1, 0);
6978 pr_warn("md: error, md_import_device() returned %ld\n",
6983 if (mddev->persistent)
6984 rdev->sb_start = calc_dev_sboffset(rdev);
6986 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6988 rdev->sectors = rdev->sb_start;
6990 if (test_bit(Faulty, &rdev->flags)) {
6991 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6992 bdevname(rdev->bdev,b), mdname(mddev));
6997 clear_bit(In_sync, &rdev->flags);
6999 rdev->saved_raid_disk = -1;
7000 err = bind_rdev_to_array(rdev, mddev);
7005 * The rest should better be atomic, we can have disk failures
7006 * noticed in interrupt contexts ...
7009 rdev->raid_disk = -1;
7011 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7013 md_update_sb(mddev, 1);
7015 * Kick recovery, maybe this spare has to be added to the
7016 * array immediately.
7018 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7019 md_wakeup_thread(mddev->thread);
7028 static int set_bitmap_file(struct mddev *mddev, int fd)
7033 if (!mddev->pers->quiesce || !mddev->thread)
7035 if (mddev->recovery || mddev->sync_thread)
7037 /* we should be able to change the bitmap.. */
7041 struct inode *inode;
7044 if (mddev->bitmap || mddev->bitmap_info.file)
7045 return -EEXIST; /* cannot add when bitmap is present */
7049 pr_warn("%s: error: failed to get bitmap file\n",
7054 inode = f->f_mapping->host;
7055 if (!S_ISREG(inode->i_mode)) {
7056 pr_warn("%s: error: bitmap file must be a regular file\n",
7059 } else if (!(f->f_mode & FMODE_WRITE)) {
7060 pr_warn("%s: error: bitmap file must open for write\n",
7063 } else if (atomic_read(&inode->i_writecount) != 1) {
7064 pr_warn("%s: error: bitmap file is already in use\n",
7072 mddev->bitmap_info.file = f;
7073 mddev->bitmap_info.offset = 0; /* file overrides offset */
7074 } else if (mddev->bitmap == NULL)
7075 return -ENOENT; /* cannot remove what isn't there */
7079 struct bitmap *bitmap;
7081 bitmap = md_bitmap_create(mddev, -1);
7082 mddev_suspend(mddev);
7083 if (!IS_ERR(bitmap)) {
7084 mddev->bitmap = bitmap;
7085 err = md_bitmap_load(mddev);
7087 err = PTR_ERR(bitmap);
7089 md_bitmap_destroy(mddev);
7092 mddev_resume(mddev);
7093 } else if (fd < 0) {
7094 mddev_suspend(mddev);
7095 md_bitmap_destroy(mddev);
7096 mddev_resume(mddev);
7100 struct file *f = mddev->bitmap_info.file;
7102 spin_lock(&mddev->lock);
7103 mddev->bitmap_info.file = NULL;
7104 spin_unlock(&mddev->lock);
7113 * md_set_array_info is used two different ways
7114 * The original usage is when creating a new array.
7115 * In this usage, raid_disks is > 0 and it together with
7116 * level, size, not_persistent,layout,chunksize determine the
7117 * shape of the array.
7118 * This will always create an array with a type-0.90.0 superblock.
7119 * The newer usage is when assembling an array.
7120 * In this case raid_disks will be 0, and the major_version field is
7121 * use to determine which style super-blocks are to be found on the devices.
7122 * The minor and patch _version numbers are also kept incase the
7123 * super_block handler wishes to interpret them.
7125 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7127 if (info->raid_disks == 0) {
7128 /* just setting version number for superblock loading */
7129 if (info->major_version < 0 ||
7130 info->major_version >= ARRAY_SIZE(super_types) ||
7131 super_types[info->major_version].name == NULL) {
7132 /* maybe try to auto-load a module? */
7133 pr_warn("md: superblock version %d not known\n",
7134 info->major_version);
7137 mddev->major_version = info->major_version;
7138 mddev->minor_version = info->minor_version;
7139 mddev->patch_version = info->patch_version;
7140 mddev->persistent = !info->not_persistent;
7141 /* ensure mddev_put doesn't delete this now that there
7142 * is some minimal configuration.
7144 mddev->ctime = ktime_get_real_seconds();
7147 mddev->major_version = MD_MAJOR_VERSION;
7148 mddev->minor_version = MD_MINOR_VERSION;
7149 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7150 mddev->ctime = ktime_get_real_seconds();
7152 mddev->level = info->level;
7153 mddev->clevel[0] = 0;
7154 mddev->dev_sectors = 2 * (sector_t)info->size;
7155 mddev->raid_disks = info->raid_disks;
7156 /* don't set md_minor, it is determined by which /dev/md* was
7159 if (info->state & (1<<MD_SB_CLEAN))
7160 mddev->recovery_cp = MaxSector;
7162 mddev->recovery_cp = 0;
7163 mddev->persistent = ! info->not_persistent;
7164 mddev->external = 0;
7166 mddev->layout = info->layout;
7167 if (mddev->level == 0)
7168 /* Cannot trust RAID0 layout info here */
7170 mddev->chunk_sectors = info->chunk_size >> 9;
7172 if (mddev->persistent) {
7173 mddev->max_disks = MD_SB_DISKS;
7175 mddev->sb_flags = 0;
7177 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7179 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7180 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7181 mddev->bitmap_info.offset = 0;
7183 mddev->reshape_position = MaxSector;
7186 * Generate a 128 bit UUID
7188 get_random_bytes(mddev->uuid, 16);
7190 mddev->new_level = mddev->level;
7191 mddev->new_chunk_sectors = mddev->chunk_sectors;
7192 mddev->new_layout = mddev->layout;
7193 mddev->delta_disks = 0;
7194 mddev->reshape_backwards = 0;
7199 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7201 lockdep_assert_held(&mddev->reconfig_mutex);
7203 if (mddev->external_size)
7206 mddev->array_sectors = array_sectors;
7208 EXPORT_SYMBOL(md_set_array_sectors);
7210 static int update_size(struct mddev *mddev, sector_t num_sectors)
7212 struct md_rdev *rdev;
7214 int fit = (num_sectors == 0);
7215 sector_t old_dev_sectors = mddev->dev_sectors;
7217 if (mddev->pers->resize == NULL)
7219 /* The "num_sectors" is the number of sectors of each device that
7220 * is used. This can only make sense for arrays with redundancy.
7221 * linear and raid0 always use whatever space is available. We can only
7222 * consider changing this number if no resync or reconstruction is
7223 * happening, and if the new size is acceptable. It must fit before the
7224 * sb_start or, if that is <data_offset, it must fit before the size
7225 * of each device. If num_sectors is zero, we find the largest size
7228 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7234 rdev_for_each(rdev, mddev) {
7235 sector_t avail = rdev->sectors;
7237 if (fit && (num_sectors == 0 || num_sectors > avail))
7238 num_sectors = avail;
7239 if (avail < num_sectors)
7242 rv = mddev->pers->resize(mddev, num_sectors);
7244 if (mddev_is_clustered(mddev))
7245 md_cluster_ops->update_size(mddev, old_dev_sectors);
7246 else if (mddev->queue) {
7247 set_capacity_and_notify(mddev->gendisk,
7248 mddev->array_sectors);
7254 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7257 struct md_rdev *rdev;
7258 /* change the number of raid disks */
7259 if (mddev->pers->check_reshape == NULL)
7263 if (raid_disks <= 0 ||
7264 (mddev->max_disks && raid_disks >= mddev->max_disks))
7266 if (mddev->sync_thread ||
7267 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7268 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7269 mddev->reshape_position != MaxSector)
7272 rdev_for_each(rdev, mddev) {
7273 if (mddev->raid_disks < raid_disks &&
7274 rdev->data_offset < rdev->new_data_offset)
7276 if (mddev->raid_disks > raid_disks &&
7277 rdev->data_offset > rdev->new_data_offset)
7281 mddev->delta_disks = raid_disks - mddev->raid_disks;
7282 if (mddev->delta_disks < 0)
7283 mddev->reshape_backwards = 1;
7284 else if (mddev->delta_disks > 0)
7285 mddev->reshape_backwards = 0;
7287 rv = mddev->pers->check_reshape(mddev);
7289 mddev->delta_disks = 0;
7290 mddev->reshape_backwards = 0;
7296 * update_array_info is used to change the configuration of an
7298 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7299 * fields in the info are checked against the array.
7300 * Any differences that cannot be handled will cause an error.
7301 * Normally, only one change can be managed at a time.
7303 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7309 /* calculate expected state,ignoring low bits */
7310 if (mddev->bitmap && mddev->bitmap_info.offset)
7311 state |= (1 << MD_SB_BITMAP_PRESENT);
7313 if (mddev->major_version != info->major_version ||
7314 mddev->minor_version != info->minor_version ||
7315 /* mddev->patch_version != info->patch_version || */
7316 mddev->ctime != info->ctime ||
7317 mddev->level != info->level ||
7318 /* mddev->layout != info->layout || */
7319 mddev->persistent != !info->not_persistent ||
7320 mddev->chunk_sectors != info->chunk_size >> 9 ||
7321 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7322 ((state^info->state) & 0xfffffe00)
7325 /* Check there is only one change */
7326 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7328 if (mddev->raid_disks != info->raid_disks)
7330 if (mddev->layout != info->layout)
7332 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7339 if (mddev->layout != info->layout) {
7341 * we don't need to do anything at the md level, the
7342 * personality will take care of it all.
7344 if (mddev->pers->check_reshape == NULL)
7347 mddev->new_layout = info->layout;
7348 rv = mddev->pers->check_reshape(mddev);
7350 mddev->new_layout = mddev->layout;
7354 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7355 rv = update_size(mddev, (sector_t)info->size * 2);
7357 if (mddev->raid_disks != info->raid_disks)
7358 rv = update_raid_disks(mddev, info->raid_disks);
7360 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7361 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7365 if (mddev->recovery || mddev->sync_thread) {
7369 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7370 struct bitmap *bitmap;
7371 /* add the bitmap */
7372 if (mddev->bitmap) {
7376 if (mddev->bitmap_info.default_offset == 0) {
7380 mddev->bitmap_info.offset =
7381 mddev->bitmap_info.default_offset;
7382 mddev->bitmap_info.space =
7383 mddev->bitmap_info.default_space;
7384 bitmap = md_bitmap_create(mddev, -1);
7385 mddev_suspend(mddev);
7386 if (!IS_ERR(bitmap)) {
7387 mddev->bitmap = bitmap;
7388 rv = md_bitmap_load(mddev);
7390 rv = PTR_ERR(bitmap);
7392 md_bitmap_destroy(mddev);
7393 mddev_resume(mddev);
7395 /* remove the bitmap */
7396 if (!mddev->bitmap) {
7400 if (mddev->bitmap->storage.file) {
7404 if (mddev->bitmap_info.nodes) {
7405 /* hold PW on all the bitmap lock */
7406 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7407 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7409 md_cluster_ops->unlock_all_bitmaps(mddev);
7413 mddev->bitmap_info.nodes = 0;
7414 md_cluster_ops->leave(mddev);
7415 module_put(md_cluster_mod);
7416 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7418 mddev_suspend(mddev);
7419 md_bitmap_destroy(mddev);
7420 mddev_resume(mddev);
7421 mddev->bitmap_info.offset = 0;
7424 md_update_sb(mddev, 1);
7430 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7432 struct md_rdev *rdev;
7435 if (mddev->pers == NULL)
7439 rdev = md_find_rdev_rcu(mddev, dev);
7443 md_error(mddev, rdev);
7444 if (!test_bit(Faulty, &rdev->flags))
7452 * We have a problem here : there is no easy way to give a CHS
7453 * virtual geometry. We currently pretend that we have a 2 heads
7454 * 4 sectors (with a BIG number of cylinders...). This drives
7455 * dosfs just mad... ;-)
7457 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7459 struct mddev *mddev = bdev->bd_disk->private_data;
7463 geo->cylinders = mddev->array_sectors / 8;
7467 static inline bool md_ioctl_valid(unsigned int cmd)
7471 case GET_ARRAY_INFO:
7472 case GET_BITMAP_FILE:
7475 case HOT_REMOVE_DISK:
7477 case RESTART_ARRAY_RW:
7479 case SET_ARRAY_INFO:
7480 case SET_BITMAP_FILE:
7481 case SET_DISK_FAULTY:
7484 case CLUSTERED_DISK_NACK:
7491 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7492 unsigned int cmd, unsigned long arg)
7495 void __user *argp = (void __user *)arg;
7496 struct mddev *mddev = NULL;
7497 bool did_set_md_closing = false;
7499 if (!md_ioctl_valid(cmd))
7504 case GET_ARRAY_INFO:
7508 if (!capable(CAP_SYS_ADMIN))
7513 * Commands dealing with the RAID driver but not any
7518 err = get_version(argp);
7524 * Commands creating/starting a new array:
7527 mddev = bdev->bd_disk->private_data;
7534 /* Some actions do not requires the mutex */
7536 case GET_ARRAY_INFO:
7537 if (!mddev->raid_disks && !mddev->external)
7540 err = get_array_info(mddev, argp);
7544 if (!mddev->raid_disks && !mddev->external)
7547 err = get_disk_info(mddev, argp);
7550 case SET_DISK_FAULTY:
7551 err = set_disk_faulty(mddev, new_decode_dev(arg));
7554 case GET_BITMAP_FILE:
7555 err = get_bitmap_file(mddev, argp);
7560 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7561 flush_rdev_wq(mddev);
7563 if (cmd == HOT_REMOVE_DISK)
7564 /* need to ensure recovery thread has run */
7565 wait_event_interruptible_timeout(mddev->sb_wait,
7566 !test_bit(MD_RECOVERY_NEEDED,
7568 msecs_to_jiffies(5000));
7569 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7570 /* Need to flush page cache, and ensure no-one else opens
7573 mutex_lock(&mddev->open_mutex);
7574 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7575 mutex_unlock(&mddev->open_mutex);
7579 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7580 mutex_unlock(&mddev->open_mutex);
7584 did_set_md_closing = true;
7585 mutex_unlock(&mddev->open_mutex);
7586 sync_blockdev(bdev);
7588 err = mddev_lock(mddev);
7590 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7595 if (cmd == SET_ARRAY_INFO) {
7596 mdu_array_info_t info;
7598 memset(&info, 0, sizeof(info));
7599 else if (copy_from_user(&info, argp, sizeof(info))) {
7604 err = update_array_info(mddev, &info);
7606 pr_warn("md: couldn't update array info. %d\n", err);
7611 if (!list_empty(&mddev->disks)) {
7612 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7616 if (mddev->raid_disks) {
7617 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7621 err = md_set_array_info(mddev, &info);
7623 pr_warn("md: couldn't set array info. %d\n", err);
7630 * Commands querying/configuring an existing array:
7632 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7633 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7634 if ((!mddev->raid_disks && !mddev->external)
7635 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7636 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7637 && cmd != GET_BITMAP_FILE) {
7643 * Commands even a read-only array can execute:
7646 case RESTART_ARRAY_RW:
7647 err = restart_array(mddev);
7651 err = do_md_stop(mddev, 0, bdev);
7655 err = md_set_readonly(mddev, bdev);
7658 case HOT_REMOVE_DISK:
7659 err = hot_remove_disk(mddev, new_decode_dev(arg));
7663 /* We can support ADD_NEW_DISK on read-only arrays
7664 * only if we are re-adding a preexisting device.
7665 * So require mddev->pers and MD_DISK_SYNC.
7668 mdu_disk_info_t info;
7669 if (copy_from_user(&info, argp, sizeof(info)))
7671 else if (!(info.state & (1<<MD_DISK_SYNC)))
7672 /* Need to clear read-only for this */
7675 err = md_add_new_disk(mddev, &info);
7682 * The remaining ioctls are changing the state of the
7683 * superblock, so we do not allow them on read-only arrays.
7685 if (mddev->ro && mddev->pers) {
7686 if (mddev->ro == 2) {
7688 sysfs_notify_dirent_safe(mddev->sysfs_state);
7689 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7690 /* mddev_unlock will wake thread */
7691 /* If a device failed while we were read-only, we
7692 * need to make sure the metadata is updated now.
7694 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7695 mddev_unlock(mddev);
7696 wait_event(mddev->sb_wait,
7697 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7698 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7699 mddev_lock_nointr(mddev);
7710 mdu_disk_info_t info;
7711 if (copy_from_user(&info, argp, sizeof(info)))
7714 err = md_add_new_disk(mddev, &info);
7718 case CLUSTERED_DISK_NACK:
7719 if (mddev_is_clustered(mddev))
7720 md_cluster_ops->new_disk_ack(mddev, false);
7726 err = hot_add_disk(mddev, new_decode_dev(arg));
7730 err = do_md_run(mddev);
7733 case SET_BITMAP_FILE:
7734 err = set_bitmap_file(mddev, (int)arg);
7743 if (mddev->hold_active == UNTIL_IOCTL &&
7745 mddev->hold_active = 0;
7746 mddev_unlock(mddev);
7748 if(did_set_md_closing)
7749 clear_bit(MD_CLOSING, &mddev->flags);
7752 #ifdef CONFIG_COMPAT
7753 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7754 unsigned int cmd, unsigned long arg)
7757 case HOT_REMOVE_DISK:
7759 case SET_DISK_FAULTY:
7760 case SET_BITMAP_FILE:
7761 /* These take in integer arg, do not convert */
7764 arg = (unsigned long)compat_ptr(arg);
7768 return md_ioctl(bdev, mode, cmd, arg);
7770 #endif /* CONFIG_COMPAT */
7772 static int md_set_read_only(struct block_device *bdev, bool ro)
7774 struct mddev *mddev = bdev->bd_disk->private_data;
7777 err = mddev_lock(mddev);
7781 if (!mddev->raid_disks && !mddev->external) {
7787 * Transitioning to read-auto need only happen for arrays that call
7788 * md_write_start and which are not ready for writes yet.
7790 if (!ro && mddev->ro == 1 && mddev->pers) {
7791 err = restart_array(mddev);
7798 mddev_unlock(mddev);
7802 static int md_open(struct block_device *bdev, fmode_t mode)
7805 * Succeed if we can lock the mddev, which confirms that
7806 * it isn't being stopped right now.
7808 struct mddev *mddev = mddev_find(bdev->bd_dev);
7814 if (mddev->gendisk != bdev->bd_disk) {
7815 /* we are racing with mddev_put which is discarding this
7819 /* Wait until bdev->bd_disk is definitely gone */
7820 if (work_pending(&mddev->del_work))
7821 flush_workqueue(md_misc_wq);
7824 BUG_ON(mddev != bdev->bd_disk->private_data);
7826 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7829 if (test_bit(MD_CLOSING, &mddev->flags)) {
7830 mutex_unlock(&mddev->open_mutex);
7836 atomic_inc(&mddev->openers);
7837 mutex_unlock(&mddev->open_mutex);
7839 bdev_check_media_change(bdev);
7846 static void md_release(struct gendisk *disk, fmode_t mode)
7848 struct mddev *mddev = disk->private_data;
7851 atomic_dec(&mddev->openers);
7855 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7857 struct mddev *mddev = disk->private_data;
7858 unsigned int ret = 0;
7861 ret = DISK_EVENT_MEDIA_CHANGE;
7866 const struct block_device_operations md_fops =
7868 .owner = THIS_MODULE,
7869 .submit_bio = md_submit_bio,
7871 .release = md_release,
7873 #ifdef CONFIG_COMPAT
7874 .compat_ioctl = md_compat_ioctl,
7876 .getgeo = md_getgeo,
7877 .check_events = md_check_events,
7878 .set_read_only = md_set_read_only,
7881 static int md_thread(void *arg)
7883 struct md_thread *thread = arg;
7886 * md_thread is a 'system-thread', it's priority should be very
7887 * high. We avoid resource deadlocks individually in each
7888 * raid personality. (RAID5 does preallocation) We also use RR and
7889 * the very same RT priority as kswapd, thus we will never get
7890 * into a priority inversion deadlock.
7892 * we definitely have to have equal or higher priority than
7893 * bdflush, otherwise bdflush will deadlock if there are too
7894 * many dirty RAID5 blocks.
7897 allow_signal(SIGKILL);
7898 while (!kthread_should_stop()) {
7900 /* We need to wait INTERRUPTIBLE so that
7901 * we don't add to the load-average.
7902 * That means we need to be sure no signals are
7905 if (signal_pending(current))
7906 flush_signals(current);
7908 wait_event_interruptible_timeout
7910 test_bit(THREAD_WAKEUP, &thread->flags)
7911 || kthread_should_stop() || kthread_should_park(),
7914 clear_bit(THREAD_WAKEUP, &thread->flags);
7915 if (kthread_should_park())
7917 if (!kthread_should_stop())
7918 thread->run(thread);
7924 void md_wakeup_thread(struct md_thread *thread)
7927 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7928 set_bit(THREAD_WAKEUP, &thread->flags);
7929 wake_up(&thread->wqueue);
7932 EXPORT_SYMBOL(md_wakeup_thread);
7934 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7935 struct mddev *mddev, const char *name)
7937 struct md_thread *thread;
7939 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7943 init_waitqueue_head(&thread->wqueue);
7946 thread->mddev = mddev;
7947 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7948 thread->tsk = kthread_run(md_thread, thread,
7950 mdname(thread->mddev),
7952 if (IS_ERR(thread->tsk)) {
7958 EXPORT_SYMBOL(md_register_thread);
7960 void md_unregister_thread(struct md_thread **threadp)
7962 struct md_thread *thread = *threadp;
7965 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7966 /* Locking ensures that mddev_unlock does not wake_up a
7967 * non-existent thread
7969 spin_lock(&pers_lock);
7971 spin_unlock(&pers_lock);
7973 kthread_stop(thread->tsk);
7976 EXPORT_SYMBOL(md_unregister_thread);
7978 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7980 if (!rdev || test_bit(Faulty, &rdev->flags))
7983 if (!mddev->pers || !mddev->pers->error_handler)
7985 mddev->pers->error_handler(mddev,rdev);
7986 if (mddev->degraded)
7987 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7988 sysfs_notify_dirent_safe(rdev->sysfs_state);
7989 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7990 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7991 md_wakeup_thread(mddev->thread);
7992 if (mddev->event_work.func)
7993 queue_work(md_misc_wq, &mddev->event_work);
7996 EXPORT_SYMBOL(md_error);
7998 /* seq_file implementation /proc/mdstat */
8000 static void status_unused(struct seq_file *seq)
8003 struct md_rdev *rdev;
8005 seq_printf(seq, "unused devices: ");
8007 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8008 char b[BDEVNAME_SIZE];
8010 seq_printf(seq, "%s ",
8011 bdevname(rdev->bdev,b));
8014 seq_printf(seq, "<none>");
8016 seq_printf(seq, "\n");
8019 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8021 sector_t max_sectors, resync, res;
8022 unsigned long dt, db = 0;
8023 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8024 int scale, recovery_active;
8025 unsigned int per_milli;
8027 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8028 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8029 max_sectors = mddev->resync_max_sectors;
8031 max_sectors = mddev->dev_sectors;
8033 resync = mddev->curr_resync;
8035 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8036 /* Still cleaning up */
8037 resync = max_sectors;
8038 } else if (resync > max_sectors)
8039 resync = max_sectors;
8041 resync -= atomic_read(&mddev->recovery_active);
8044 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8045 struct md_rdev *rdev;
8047 rdev_for_each(rdev, mddev)
8048 if (rdev->raid_disk >= 0 &&
8049 !test_bit(Faulty, &rdev->flags) &&
8050 rdev->recovery_offset != MaxSector &&
8051 rdev->recovery_offset) {
8052 seq_printf(seq, "\trecover=REMOTE");
8055 if (mddev->reshape_position != MaxSector)
8056 seq_printf(seq, "\treshape=REMOTE");
8058 seq_printf(seq, "\tresync=REMOTE");
8061 if (mddev->recovery_cp < MaxSector) {
8062 seq_printf(seq, "\tresync=PENDING");
8068 seq_printf(seq, "\tresync=DELAYED");
8072 WARN_ON(max_sectors == 0);
8073 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8074 * in a sector_t, and (max_sectors>>scale) will fit in a
8075 * u32, as those are the requirements for sector_div.
8076 * Thus 'scale' must be at least 10
8079 if (sizeof(sector_t) > sizeof(unsigned long)) {
8080 while ( max_sectors/2 > (1ULL<<(scale+32)))
8083 res = (resync>>scale)*1000;
8084 sector_div(res, (u32)((max_sectors>>scale)+1));
8088 int i, x = per_milli/50, y = 20-x;
8089 seq_printf(seq, "[");
8090 for (i = 0; i < x; i++)
8091 seq_printf(seq, "=");
8092 seq_printf(seq, ">");
8093 for (i = 0; i < y; i++)
8094 seq_printf(seq, ".");
8095 seq_printf(seq, "] ");
8097 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8098 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8100 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8102 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8103 "resync" : "recovery"))),
8104 per_milli/10, per_milli % 10,
8105 (unsigned long long) resync/2,
8106 (unsigned long long) max_sectors/2);
8109 * dt: time from mark until now
8110 * db: blocks written from mark until now
8111 * rt: remaining time
8113 * rt is a sector_t, which is always 64bit now. We are keeping
8114 * the original algorithm, but it is not really necessary.
8116 * Original algorithm:
8117 * So we divide before multiply in case it is 32bit and close
8119 * We scale the divisor (db) by 32 to avoid losing precision
8120 * near the end of resync when the number of remaining sectors
8122 * We then divide rt by 32 after multiplying by db to compensate.
8123 * The '+1' avoids division by zero if db is very small.
8125 dt = ((jiffies - mddev->resync_mark) / HZ);
8128 curr_mark_cnt = mddev->curr_mark_cnt;
8129 recovery_active = atomic_read(&mddev->recovery_active);
8130 resync_mark_cnt = mddev->resync_mark_cnt;
8132 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8133 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8135 rt = max_sectors - resync; /* number of remaining sectors */
8136 rt = div64_u64(rt, db/32+1);
8140 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8141 ((unsigned long)rt % 60)/6);
8143 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8147 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8149 struct list_head *tmp;
8151 struct mddev *mddev;
8163 spin_lock(&all_mddevs_lock);
8164 list_for_each(tmp,&all_mddevs)
8166 mddev = list_entry(tmp, struct mddev, all_mddevs);
8168 spin_unlock(&all_mddevs_lock);
8171 spin_unlock(&all_mddevs_lock);
8173 return (void*)2;/* tail */
8177 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8179 struct list_head *tmp;
8180 struct mddev *next_mddev, *mddev = v;
8186 spin_lock(&all_mddevs_lock);
8188 tmp = all_mddevs.next;
8190 tmp = mddev->all_mddevs.next;
8191 if (tmp != &all_mddevs)
8192 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8194 next_mddev = (void*)2;
8197 spin_unlock(&all_mddevs_lock);
8205 static void md_seq_stop(struct seq_file *seq, void *v)
8207 struct mddev *mddev = v;
8209 if (mddev && v != (void*)1 && v != (void*)2)
8213 static int md_seq_show(struct seq_file *seq, void *v)
8215 struct mddev *mddev = v;
8217 struct md_rdev *rdev;
8219 if (v == (void*)1) {
8220 struct md_personality *pers;
8221 seq_printf(seq, "Personalities : ");
8222 spin_lock(&pers_lock);
8223 list_for_each_entry(pers, &pers_list, list)
8224 seq_printf(seq, "[%s] ", pers->name);
8226 spin_unlock(&pers_lock);
8227 seq_printf(seq, "\n");
8228 seq->poll_event = atomic_read(&md_event_count);
8231 if (v == (void*)2) {
8236 spin_lock(&mddev->lock);
8237 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8238 seq_printf(seq, "%s : %sactive", mdname(mddev),
8239 mddev->pers ? "" : "in");
8242 seq_printf(seq, " (read-only)");
8244 seq_printf(seq, " (auto-read-only)");
8245 seq_printf(seq, " %s", mddev->pers->name);
8250 rdev_for_each_rcu(rdev, mddev) {
8251 char b[BDEVNAME_SIZE];
8252 seq_printf(seq, " %s[%d]",
8253 bdevname(rdev->bdev,b), rdev->desc_nr);
8254 if (test_bit(WriteMostly, &rdev->flags))
8255 seq_printf(seq, "(W)");
8256 if (test_bit(Journal, &rdev->flags))
8257 seq_printf(seq, "(J)");
8258 if (test_bit(Faulty, &rdev->flags)) {
8259 seq_printf(seq, "(F)");
8262 if (rdev->raid_disk < 0)
8263 seq_printf(seq, "(S)"); /* spare */
8264 if (test_bit(Replacement, &rdev->flags))
8265 seq_printf(seq, "(R)");
8266 sectors += rdev->sectors;
8270 if (!list_empty(&mddev->disks)) {
8272 seq_printf(seq, "\n %llu blocks",
8273 (unsigned long long)
8274 mddev->array_sectors / 2);
8276 seq_printf(seq, "\n %llu blocks",
8277 (unsigned long long)sectors / 2);
8279 if (mddev->persistent) {
8280 if (mddev->major_version != 0 ||
8281 mddev->minor_version != 90) {
8282 seq_printf(seq," super %d.%d",
8283 mddev->major_version,
8284 mddev->minor_version);
8286 } else if (mddev->external)
8287 seq_printf(seq, " super external:%s",
8288 mddev->metadata_type);
8290 seq_printf(seq, " super non-persistent");
8293 mddev->pers->status(seq, mddev);
8294 seq_printf(seq, "\n ");
8295 if (mddev->pers->sync_request) {
8296 if (status_resync(seq, mddev))
8297 seq_printf(seq, "\n ");
8300 seq_printf(seq, "\n ");
8302 md_bitmap_status(seq, mddev->bitmap);
8304 seq_printf(seq, "\n");
8306 spin_unlock(&mddev->lock);
8311 static const struct seq_operations md_seq_ops = {
8312 .start = md_seq_start,
8313 .next = md_seq_next,
8314 .stop = md_seq_stop,
8315 .show = md_seq_show,
8318 static int md_seq_open(struct inode *inode, struct file *file)
8320 struct seq_file *seq;
8323 error = seq_open(file, &md_seq_ops);
8327 seq = file->private_data;
8328 seq->poll_event = atomic_read(&md_event_count);
8332 static int md_unloading;
8333 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8335 struct seq_file *seq = filp->private_data;
8339 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8340 poll_wait(filp, &md_event_waiters, wait);
8342 /* always allow read */
8343 mask = EPOLLIN | EPOLLRDNORM;
8345 if (seq->poll_event != atomic_read(&md_event_count))
8346 mask |= EPOLLERR | EPOLLPRI;
8350 static const struct proc_ops mdstat_proc_ops = {
8351 .proc_open = md_seq_open,
8352 .proc_read = seq_read,
8353 .proc_lseek = seq_lseek,
8354 .proc_release = seq_release,
8355 .proc_poll = mdstat_poll,
8358 int register_md_personality(struct md_personality *p)
8360 pr_debug("md: %s personality registered for level %d\n",
8362 spin_lock(&pers_lock);
8363 list_add_tail(&p->list, &pers_list);
8364 spin_unlock(&pers_lock);
8367 EXPORT_SYMBOL(register_md_personality);
8369 int unregister_md_personality(struct md_personality *p)
8371 pr_debug("md: %s personality unregistered\n", p->name);
8372 spin_lock(&pers_lock);
8373 list_del_init(&p->list);
8374 spin_unlock(&pers_lock);
8377 EXPORT_SYMBOL(unregister_md_personality);
8379 int register_md_cluster_operations(struct md_cluster_operations *ops,
8380 struct module *module)
8383 spin_lock(&pers_lock);
8384 if (md_cluster_ops != NULL)
8387 md_cluster_ops = ops;
8388 md_cluster_mod = module;
8390 spin_unlock(&pers_lock);
8393 EXPORT_SYMBOL(register_md_cluster_operations);
8395 int unregister_md_cluster_operations(void)
8397 spin_lock(&pers_lock);
8398 md_cluster_ops = NULL;
8399 spin_unlock(&pers_lock);
8402 EXPORT_SYMBOL(unregister_md_cluster_operations);
8404 int md_setup_cluster(struct mddev *mddev, int nodes)
8407 if (!md_cluster_ops)
8408 request_module("md-cluster");
8409 spin_lock(&pers_lock);
8410 /* ensure module won't be unloaded */
8411 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8412 pr_warn("can't find md-cluster module or get it's reference.\n");
8413 spin_unlock(&pers_lock);
8416 spin_unlock(&pers_lock);
8418 ret = md_cluster_ops->join(mddev, nodes);
8420 mddev->safemode_delay = 0;
8424 void md_cluster_stop(struct mddev *mddev)
8426 if (!md_cluster_ops)
8428 md_cluster_ops->leave(mddev);
8429 module_put(md_cluster_mod);
8432 static int is_mddev_idle(struct mddev *mddev, int init)
8434 struct md_rdev *rdev;
8440 rdev_for_each_rcu(rdev, mddev) {
8441 struct gendisk *disk = rdev->bdev->bd_disk;
8442 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8443 atomic_read(&disk->sync_io);
8444 /* sync IO will cause sync_io to increase before the disk_stats
8445 * as sync_io is counted when a request starts, and
8446 * disk_stats is counted when it completes.
8447 * So resync activity will cause curr_events to be smaller than
8448 * when there was no such activity.
8449 * non-sync IO will cause disk_stat to increase without
8450 * increasing sync_io so curr_events will (eventually)
8451 * be larger than it was before. Once it becomes
8452 * substantially larger, the test below will cause
8453 * the array to appear non-idle, and resync will slow
8455 * If there is a lot of outstanding resync activity when
8456 * we set last_event to curr_events, then all that activity
8457 * completing might cause the array to appear non-idle
8458 * and resync will be slowed down even though there might
8459 * not have been non-resync activity. This will only
8460 * happen once though. 'last_events' will soon reflect
8461 * the state where there is little or no outstanding
8462 * resync requests, and further resync activity will
8463 * always make curr_events less than last_events.
8466 if (init || curr_events - rdev->last_events > 64) {
8467 rdev->last_events = curr_events;
8475 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8477 /* another "blocks" (512byte) blocks have been synced */
8478 atomic_sub(blocks, &mddev->recovery_active);
8479 wake_up(&mddev->recovery_wait);
8481 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8482 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8483 md_wakeup_thread(mddev->thread);
8484 // stop recovery, signal do_sync ....
8487 EXPORT_SYMBOL(md_done_sync);
8489 /* md_write_start(mddev, bi)
8490 * If we need to update some array metadata (e.g. 'active' flag
8491 * in superblock) before writing, schedule a superblock update
8492 * and wait for it to complete.
8493 * A return value of 'false' means that the write wasn't recorded
8494 * and cannot proceed as the array is being suspend.
8496 bool md_write_start(struct mddev *mddev, struct bio *bi)
8500 if (bio_data_dir(bi) != WRITE)
8503 BUG_ON(mddev->ro == 1);
8504 if (mddev->ro == 2) {
8505 /* need to switch to read/write */
8507 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8508 md_wakeup_thread(mddev->thread);
8509 md_wakeup_thread(mddev->sync_thread);
8513 percpu_ref_get(&mddev->writes_pending);
8514 smp_mb(); /* Match smp_mb in set_in_sync() */
8515 if (mddev->safemode == 1)
8516 mddev->safemode = 0;
8517 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8518 if (mddev->in_sync || mddev->sync_checkers) {
8519 spin_lock(&mddev->lock);
8520 if (mddev->in_sync) {
8522 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8523 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8524 md_wakeup_thread(mddev->thread);
8527 spin_unlock(&mddev->lock);
8531 sysfs_notify_dirent_safe(mddev->sysfs_state);
8532 if (!mddev->has_superblocks)
8534 wait_event(mddev->sb_wait,
8535 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8537 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8538 percpu_ref_put(&mddev->writes_pending);
8543 EXPORT_SYMBOL(md_write_start);
8545 /* md_write_inc can only be called when md_write_start() has
8546 * already been called at least once of the current request.
8547 * It increments the counter and is useful when a single request
8548 * is split into several parts. Each part causes an increment and
8549 * so needs a matching md_write_end().
8550 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8551 * a spinlocked region.
8553 void md_write_inc(struct mddev *mddev, struct bio *bi)
8555 if (bio_data_dir(bi) != WRITE)
8557 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8558 percpu_ref_get(&mddev->writes_pending);
8560 EXPORT_SYMBOL(md_write_inc);
8562 void md_write_end(struct mddev *mddev)
8564 percpu_ref_put(&mddev->writes_pending);
8566 if (mddev->safemode == 2)
8567 md_wakeup_thread(mddev->thread);
8568 else if (mddev->safemode_delay)
8569 /* The roundup() ensures this only performs locking once
8570 * every ->safemode_delay jiffies
8572 mod_timer(&mddev->safemode_timer,
8573 roundup(jiffies, mddev->safemode_delay) +
8574 mddev->safemode_delay);
8577 EXPORT_SYMBOL(md_write_end);
8579 /* This is used by raid0 and raid10 */
8580 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8581 struct bio *bio, sector_t start, sector_t size)
8583 struct bio *discard_bio = NULL;
8585 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO, 0,
8586 &discard_bio) || !discard_bio)
8589 bio_chain(discard_bio, bio);
8590 bio_clone_blkg_association(discard_bio, bio);
8592 trace_block_bio_remap(discard_bio,
8593 disk_devt(mddev->gendisk),
8594 bio->bi_iter.bi_sector);
8595 submit_bio_noacct(discard_bio);
8597 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8599 static void md_end_io_acct(struct bio *bio)
8601 struct md_io_acct *md_io_acct = bio->bi_private;
8602 struct bio *orig_bio = md_io_acct->orig_bio;
8604 orig_bio->bi_status = bio->bi_status;
8606 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8608 bio_endio(orig_bio);
8612 * Used by personalities that don't already clone the bio and thus can't
8613 * easily add the timestamp to their extended bio structure.
8615 void md_account_bio(struct mddev *mddev, struct bio **bio)
8617 struct md_io_acct *md_io_acct;
8620 if (!blk_queue_io_stat((*bio)->bi_bdev->bd_disk->queue))
8623 clone = bio_clone_fast(*bio, GFP_NOIO, &mddev->io_acct_set);
8624 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8625 md_io_acct->orig_bio = *bio;
8626 md_io_acct->start_time = bio_start_io_acct(*bio);
8628 clone->bi_end_io = md_end_io_acct;
8629 clone->bi_private = md_io_acct;
8632 EXPORT_SYMBOL_GPL(md_account_bio);
8634 /* md_allow_write(mddev)
8635 * Calling this ensures that the array is marked 'active' so that writes
8636 * may proceed without blocking. It is important to call this before
8637 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8638 * Must be called with mddev_lock held.
8640 void md_allow_write(struct mddev *mddev)
8646 if (!mddev->pers->sync_request)
8649 spin_lock(&mddev->lock);
8650 if (mddev->in_sync) {
8652 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8653 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8654 if (mddev->safemode_delay &&
8655 mddev->safemode == 0)
8656 mddev->safemode = 1;
8657 spin_unlock(&mddev->lock);
8658 md_update_sb(mddev, 0);
8659 sysfs_notify_dirent_safe(mddev->sysfs_state);
8660 /* wait for the dirty state to be recorded in the metadata */
8661 wait_event(mddev->sb_wait,
8662 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8664 spin_unlock(&mddev->lock);
8666 EXPORT_SYMBOL_GPL(md_allow_write);
8668 #define SYNC_MARKS 10
8669 #define SYNC_MARK_STEP (3*HZ)
8670 #define UPDATE_FREQUENCY (5*60*HZ)
8671 void md_do_sync(struct md_thread *thread)
8673 struct mddev *mddev = thread->mddev;
8674 struct mddev *mddev2;
8675 unsigned int currspeed = 0, window;
8676 sector_t max_sectors,j, io_sectors, recovery_done;
8677 unsigned long mark[SYNC_MARKS];
8678 unsigned long update_time;
8679 sector_t mark_cnt[SYNC_MARKS];
8681 struct list_head *tmp;
8682 sector_t last_check;
8684 struct md_rdev *rdev;
8685 char *desc, *action = NULL;
8686 struct blk_plug plug;
8689 /* just incase thread restarts... */
8690 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8691 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8693 if (mddev->ro) {/* never try to sync a read-only array */
8694 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8698 if (mddev_is_clustered(mddev)) {
8699 ret = md_cluster_ops->resync_start(mddev);
8703 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8704 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8705 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8706 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8707 && ((unsigned long long)mddev->curr_resync_completed
8708 < (unsigned long long)mddev->resync_max_sectors))
8712 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8713 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8714 desc = "data-check";
8716 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8717 desc = "requested-resync";
8721 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8726 mddev->last_sync_action = action ?: desc;
8728 /* we overload curr_resync somewhat here.
8729 * 0 == not engaged in resync at all
8730 * 2 == checking that there is no conflict with another sync
8731 * 1 == like 2, but have yielded to allow conflicting resync to
8733 * other == active in resync - this many blocks
8735 * Before starting a resync we must have set curr_resync to
8736 * 2, and then checked that every "conflicting" array has curr_resync
8737 * less than ours. When we find one that is the same or higher
8738 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8739 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8740 * This will mean we have to start checking from the beginning again.
8745 int mddev2_minor = -1;
8746 mddev->curr_resync = 2;
8749 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8751 for_each_mddev(mddev2, tmp) {
8752 if (mddev2 == mddev)
8754 if (!mddev->parallel_resync
8755 && mddev2->curr_resync
8756 && match_mddev_units(mddev, mddev2)) {
8758 if (mddev < mddev2 && mddev->curr_resync == 2) {
8759 /* arbitrarily yield */
8760 mddev->curr_resync = 1;
8761 wake_up(&resync_wait);
8763 if (mddev > mddev2 && mddev->curr_resync == 1)
8764 /* no need to wait here, we can wait the next
8765 * time 'round when curr_resync == 2
8768 /* We need to wait 'interruptible' so as not to
8769 * contribute to the load average, and not to
8770 * be caught by 'softlockup'
8772 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8773 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8774 mddev2->curr_resync >= mddev->curr_resync) {
8775 if (mddev2_minor != mddev2->md_minor) {
8776 mddev2_minor = mddev2->md_minor;
8777 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8778 desc, mdname(mddev),
8782 if (signal_pending(current))
8783 flush_signals(current);
8785 finish_wait(&resync_wait, &wq);
8788 finish_wait(&resync_wait, &wq);
8791 } while (mddev->curr_resync < 2);
8794 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8795 /* resync follows the size requested by the personality,
8796 * which defaults to physical size, but can be virtual size
8798 max_sectors = mddev->resync_max_sectors;
8799 atomic64_set(&mddev->resync_mismatches, 0);
8800 /* we don't use the checkpoint if there's a bitmap */
8801 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8802 j = mddev->resync_min;
8803 else if (!mddev->bitmap)
8804 j = mddev->recovery_cp;
8806 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8807 max_sectors = mddev->resync_max_sectors;
8809 * If the original node aborts reshaping then we continue the
8810 * reshaping, so set j again to avoid restart reshape from the
8813 if (mddev_is_clustered(mddev) &&
8814 mddev->reshape_position != MaxSector)
8815 j = mddev->reshape_position;
8817 /* recovery follows the physical size of devices */
8818 max_sectors = mddev->dev_sectors;
8821 rdev_for_each_rcu(rdev, mddev)
8822 if (rdev->raid_disk >= 0 &&
8823 !test_bit(Journal, &rdev->flags) &&
8824 !test_bit(Faulty, &rdev->flags) &&
8825 !test_bit(In_sync, &rdev->flags) &&
8826 rdev->recovery_offset < j)
8827 j = rdev->recovery_offset;
8830 /* If there is a bitmap, we need to make sure all
8831 * writes that started before we added a spare
8832 * complete before we start doing a recovery.
8833 * Otherwise the write might complete and (via
8834 * bitmap_endwrite) set a bit in the bitmap after the
8835 * recovery has checked that bit and skipped that
8838 if (mddev->bitmap) {
8839 mddev->pers->quiesce(mddev, 1);
8840 mddev->pers->quiesce(mddev, 0);
8844 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8845 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8846 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8847 speed_max(mddev), desc);
8849 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8852 for (m = 0; m < SYNC_MARKS; m++) {
8854 mark_cnt[m] = io_sectors;
8857 mddev->resync_mark = mark[last_mark];
8858 mddev->resync_mark_cnt = mark_cnt[last_mark];
8861 * Tune reconstruction:
8863 window = 32 * (PAGE_SIZE / 512);
8864 pr_debug("md: using %dk window, over a total of %lluk.\n",
8865 window/2, (unsigned long long)max_sectors/2);
8867 atomic_set(&mddev->recovery_active, 0);
8871 pr_debug("md: resuming %s of %s from checkpoint.\n",
8872 desc, mdname(mddev));
8873 mddev->curr_resync = j;
8875 mddev->curr_resync = 3; /* no longer delayed */
8876 mddev->curr_resync_completed = j;
8877 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8879 update_time = jiffies;
8881 blk_start_plug(&plug);
8882 while (j < max_sectors) {
8887 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8888 ((mddev->curr_resync > mddev->curr_resync_completed &&
8889 (mddev->curr_resync - mddev->curr_resync_completed)
8890 > (max_sectors >> 4)) ||
8891 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8892 (j - mddev->curr_resync_completed)*2
8893 >= mddev->resync_max - mddev->curr_resync_completed ||
8894 mddev->curr_resync_completed > mddev->resync_max
8896 /* time to update curr_resync_completed */
8897 wait_event(mddev->recovery_wait,
8898 atomic_read(&mddev->recovery_active) == 0);
8899 mddev->curr_resync_completed = j;
8900 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8901 j > mddev->recovery_cp)
8902 mddev->recovery_cp = j;
8903 update_time = jiffies;
8904 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8905 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8908 while (j >= mddev->resync_max &&
8909 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8910 /* As this condition is controlled by user-space,
8911 * we can block indefinitely, so use '_interruptible'
8912 * to avoid triggering warnings.
8914 flush_signals(current); /* just in case */
8915 wait_event_interruptible(mddev->recovery_wait,
8916 mddev->resync_max > j
8917 || test_bit(MD_RECOVERY_INTR,
8921 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8924 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8926 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8930 if (!skipped) { /* actual IO requested */
8931 io_sectors += sectors;
8932 atomic_add(sectors, &mddev->recovery_active);
8935 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8939 if (j > max_sectors)
8940 /* when skipping, extra large numbers can be returned. */
8943 mddev->curr_resync = j;
8944 mddev->curr_mark_cnt = io_sectors;
8945 if (last_check == 0)
8946 /* this is the earliest that rebuild will be
8947 * visible in /proc/mdstat
8951 if (last_check + window > io_sectors || j == max_sectors)
8954 last_check = io_sectors;
8956 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8958 int next = (last_mark+1) % SYNC_MARKS;
8960 mddev->resync_mark = mark[next];
8961 mddev->resync_mark_cnt = mark_cnt[next];
8962 mark[next] = jiffies;
8963 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8967 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8971 * this loop exits only if either when we are slower than
8972 * the 'hard' speed limit, or the system was IO-idle for
8974 * the system might be non-idle CPU-wise, but we only care
8975 * about not overloading the IO subsystem. (things like an
8976 * e2fsck being done on the RAID array should execute fast)
8980 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8981 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8982 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8984 if (currspeed > speed_min(mddev)) {
8985 if (currspeed > speed_max(mddev)) {
8989 if (!is_mddev_idle(mddev, 0)) {
8991 * Give other IO more of a chance.
8992 * The faster the devices, the less we wait.
8994 wait_event(mddev->recovery_wait,
8995 !atomic_read(&mddev->recovery_active));
8999 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9000 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9001 ? "interrupted" : "done");
9003 * this also signals 'finished resyncing' to md_stop
9005 blk_finish_plug(&plug);
9006 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9008 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9009 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9010 mddev->curr_resync > 3) {
9011 mddev->curr_resync_completed = mddev->curr_resync;
9012 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9014 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9016 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9017 mddev->curr_resync > 3) {
9018 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9019 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9020 if (mddev->curr_resync >= mddev->recovery_cp) {
9021 pr_debug("md: checkpointing %s of %s.\n",
9022 desc, mdname(mddev));
9023 if (test_bit(MD_RECOVERY_ERROR,
9025 mddev->recovery_cp =
9026 mddev->curr_resync_completed;
9028 mddev->recovery_cp =
9032 mddev->recovery_cp = MaxSector;
9034 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9035 mddev->curr_resync = MaxSector;
9036 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9037 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9039 rdev_for_each_rcu(rdev, mddev)
9040 if (rdev->raid_disk >= 0 &&
9041 mddev->delta_disks >= 0 &&
9042 !test_bit(Journal, &rdev->flags) &&
9043 !test_bit(Faulty, &rdev->flags) &&
9044 !test_bit(In_sync, &rdev->flags) &&
9045 rdev->recovery_offset < mddev->curr_resync)
9046 rdev->recovery_offset = mddev->curr_resync;
9052 /* set CHANGE_PENDING here since maybe another update is needed,
9053 * so other nodes are informed. It should be harmless for normal
9055 set_mask_bits(&mddev->sb_flags, 0,
9056 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9058 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9059 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9060 mddev->delta_disks > 0 &&
9061 mddev->pers->finish_reshape &&
9062 mddev->pers->size &&
9064 mddev_lock_nointr(mddev);
9065 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9066 mddev_unlock(mddev);
9067 if (!mddev_is_clustered(mddev))
9068 set_capacity_and_notify(mddev->gendisk,
9069 mddev->array_sectors);
9072 spin_lock(&mddev->lock);
9073 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9074 /* We completed so min/max setting can be forgotten if used. */
9075 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9076 mddev->resync_min = 0;
9077 mddev->resync_max = MaxSector;
9078 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9079 mddev->resync_min = mddev->curr_resync_completed;
9080 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9081 mddev->curr_resync = 0;
9082 spin_unlock(&mddev->lock);
9084 wake_up(&resync_wait);
9085 md_wakeup_thread(mddev->thread);
9088 EXPORT_SYMBOL_GPL(md_do_sync);
9090 static int remove_and_add_spares(struct mddev *mddev,
9091 struct md_rdev *this)
9093 struct md_rdev *rdev;
9096 bool remove_some = false;
9098 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9099 /* Mustn't remove devices when resync thread is running */
9102 rdev_for_each(rdev, mddev) {
9103 if ((this == NULL || rdev == this) &&
9104 rdev->raid_disk >= 0 &&
9105 !test_bit(Blocked, &rdev->flags) &&
9106 test_bit(Faulty, &rdev->flags) &&
9107 atomic_read(&rdev->nr_pending)==0) {
9108 /* Faulty non-Blocked devices with nr_pending == 0
9109 * never get nr_pending incremented,
9110 * never get Faulty cleared, and never get Blocked set.
9111 * So we can synchronize_rcu now rather than once per device
9114 set_bit(RemoveSynchronized, &rdev->flags);
9120 rdev_for_each(rdev, mddev) {
9121 if ((this == NULL || rdev == this) &&
9122 rdev->raid_disk >= 0 &&
9123 !test_bit(Blocked, &rdev->flags) &&
9124 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9125 (!test_bit(In_sync, &rdev->flags) &&
9126 !test_bit(Journal, &rdev->flags))) &&
9127 atomic_read(&rdev->nr_pending)==0)) {
9128 if (mddev->pers->hot_remove_disk(
9129 mddev, rdev) == 0) {
9130 sysfs_unlink_rdev(mddev, rdev);
9131 rdev->saved_raid_disk = rdev->raid_disk;
9132 rdev->raid_disk = -1;
9136 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9137 clear_bit(RemoveSynchronized, &rdev->flags);
9140 if (removed && mddev->kobj.sd)
9141 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9143 if (this && removed)
9146 rdev_for_each(rdev, mddev) {
9147 if (this && this != rdev)
9149 if (test_bit(Candidate, &rdev->flags))
9151 if (rdev->raid_disk >= 0 &&
9152 !test_bit(In_sync, &rdev->flags) &&
9153 !test_bit(Journal, &rdev->flags) &&
9154 !test_bit(Faulty, &rdev->flags))
9156 if (rdev->raid_disk >= 0)
9158 if (test_bit(Faulty, &rdev->flags))
9160 if (!test_bit(Journal, &rdev->flags)) {
9162 ! (rdev->saved_raid_disk >= 0 &&
9163 !test_bit(Bitmap_sync, &rdev->flags)))
9166 rdev->recovery_offset = 0;
9168 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9169 /* failure here is OK */
9170 sysfs_link_rdev(mddev, rdev);
9171 if (!test_bit(Journal, &rdev->flags))
9174 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9179 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9183 static void md_start_sync(struct work_struct *ws)
9185 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9187 mddev->sync_thread = md_register_thread(md_do_sync,
9190 if (!mddev->sync_thread) {
9191 pr_warn("%s: could not start resync thread...\n",
9193 /* leave the spares where they are, it shouldn't hurt */
9194 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9195 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9196 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9197 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9198 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9199 wake_up(&resync_wait);
9200 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9202 if (mddev->sysfs_action)
9203 sysfs_notify_dirent_safe(mddev->sysfs_action);
9205 md_wakeup_thread(mddev->sync_thread);
9206 sysfs_notify_dirent_safe(mddev->sysfs_action);
9211 * This routine is regularly called by all per-raid-array threads to
9212 * deal with generic issues like resync and super-block update.
9213 * Raid personalities that don't have a thread (linear/raid0) do not
9214 * need this as they never do any recovery or update the superblock.
9216 * It does not do any resync itself, but rather "forks" off other threads
9217 * to do that as needed.
9218 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9219 * "->recovery" and create a thread at ->sync_thread.
9220 * When the thread finishes it sets MD_RECOVERY_DONE
9221 * and wakeups up this thread which will reap the thread and finish up.
9222 * This thread also removes any faulty devices (with nr_pending == 0).
9224 * The overall approach is:
9225 * 1/ if the superblock needs updating, update it.
9226 * 2/ If a recovery thread is running, don't do anything else.
9227 * 3/ If recovery has finished, clean up, possibly marking spares active.
9228 * 4/ If there are any faulty devices, remove them.
9229 * 5/ If array is degraded, try to add spares devices
9230 * 6/ If array has spares or is not in-sync, start a resync thread.
9232 void md_check_recovery(struct mddev *mddev)
9234 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9235 /* Write superblock - thread that called mddev_suspend()
9236 * holds reconfig_mutex for us.
9238 set_bit(MD_UPDATING_SB, &mddev->flags);
9239 smp_mb__after_atomic();
9240 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9241 md_update_sb(mddev, 0);
9242 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9243 wake_up(&mddev->sb_wait);
9246 if (mddev->suspended)
9250 md_bitmap_daemon_work(mddev);
9252 if (signal_pending(current)) {
9253 if (mddev->pers->sync_request && !mddev->external) {
9254 pr_debug("md: %s in immediate safe mode\n",
9256 mddev->safemode = 2;
9258 flush_signals(current);
9261 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9264 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9265 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9266 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9267 (mddev->external == 0 && mddev->safemode == 1) ||
9268 (mddev->safemode == 2
9269 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9273 if (mddev_trylock(mddev)) {
9275 bool try_set_sync = mddev->safemode != 0;
9277 if (!mddev->external && mddev->safemode == 1)
9278 mddev->safemode = 0;
9281 struct md_rdev *rdev;
9282 if (!mddev->external && mddev->in_sync)
9283 /* 'Blocked' flag not needed as failed devices
9284 * will be recorded if array switched to read/write.
9285 * Leaving it set will prevent the device
9286 * from being removed.
9288 rdev_for_each(rdev, mddev)
9289 clear_bit(Blocked, &rdev->flags);
9290 /* On a read-only array we can:
9291 * - remove failed devices
9292 * - add already-in_sync devices if the array itself
9294 * As we only add devices that are already in-sync,
9295 * we can activate the spares immediately.
9297 remove_and_add_spares(mddev, NULL);
9298 /* There is no thread, but we need to call
9299 * ->spare_active and clear saved_raid_disk
9301 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9302 md_reap_sync_thread(mddev);
9303 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9304 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9305 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9309 if (mddev_is_clustered(mddev)) {
9310 struct md_rdev *rdev, *tmp;
9311 /* kick the device if another node issued a
9314 rdev_for_each_safe(rdev, tmp, mddev) {
9315 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9316 rdev->raid_disk < 0)
9317 md_kick_rdev_from_array(rdev);
9321 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9322 spin_lock(&mddev->lock);
9324 spin_unlock(&mddev->lock);
9327 if (mddev->sb_flags)
9328 md_update_sb(mddev, 0);
9330 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9331 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9332 /* resync/recovery still happening */
9333 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9336 if (mddev->sync_thread) {
9337 md_reap_sync_thread(mddev);
9340 /* Set RUNNING before clearing NEEDED to avoid
9341 * any transients in the value of "sync_action".
9343 mddev->curr_resync_completed = 0;
9344 spin_lock(&mddev->lock);
9345 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9346 spin_unlock(&mddev->lock);
9347 /* Clear some bits that don't mean anything, but
9350 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9351 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9353 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9354 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9356 /* no recovery is running.
9357 * remove any failed drives, then
9358 * add spares if possible.
9359 * Spares are also removed and re-added, to allow
9360 * the personality to fail the re-add.
9363 if (mddev->reshape_position != MaxSector) {
9364 if (mddev->pers->check_reshape == NULL ||
9365 mddev->pers->check_reshape(mddev) != 0)
9366 /* Cannot proceed */
9368 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9369 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9370 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9371 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9372 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9373 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9374 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9375 } else if (mddev->recovery_cp < MaxSector) {
9376 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9377 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9378 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9379 /* nothing to be done ... */
9382 if (mddev->pers->sync_request) {
9384 /* We are adding a device or devices to an array
9385 * which has the bitmap stored on all devices.
9386 * So make sure all bitmap pages get written
9388 md_bitmap_write_all(mddev->bitmap);
9390 INIT_WORK(&mddev->del_work, md_start_sync);
9391 queue_work(md_misc_wq, &mddev->del_work);
9395 if (!mddev->sync_thread) {
9396 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9397 wake_up(&resync_wait);
9398 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9400 if (mddev->sysfs_action)
9401 sysfs_notify_dirent_safe(mddev->sysfs_action);
9404 wake_up(&mddev->sb_wait);
9405 mddev_unlock(mddev);
9408 EXPORT_SYMBOL(md_check_recovery);
9410 void md_reap_sync_thread(struct mddev *mddev)
9412 struct md_rdev *rdev;
9413 sector_t old_dev_sectors = mddev->dev_sectors;
9414 bool is_reshaped = false;
9416 /* resync has finished, collect result */
9417 md_unregister_thread(&mddev->sync_thread);
9418 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9419 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9420 mddev->degraded != mddev->raid_disks) {
9422 /* activate any spares */
9423 if (mddev->pers->spare_active(mddev)) {
9424 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9425 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9428 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9429 mddev->pers->finish_reshape) {
9430 mddev->pers->finish_reshape(mddev);
9431 if (mddev_is_clustered(mddev))
9435 /* If array is no-longer degraded, then any saved_raid_disk
9436 * information must be scrapped.
9438 if (!mddev->degraded)
9439 rdev_for_each(rdev, mddev)
9440 rdev->saved_raid_disk = -1;
9442 md_update_sb(mddev, 1);
9443 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9444 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9446 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9447 md_cluster_ops->resync_finish(mddev);
9448 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9449 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9450 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9451 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9452 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9453 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9455 * We call md_cluster_ops->update_size here because sync_size could
9456 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9457 * so it is time to update size across cluster.
9459 if (mddev_is_clustered(mddev) && is_reshaped
9460 && !test_bit(MD_CLOSING, &mddev->flags))
9461 md_cluster_ops->update_size(mddev, old_dev_sectors);
9462 wake_up(&resync_wait);
9463 /* flag recovery needed just to double check */
9464 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9465 sysfs_notify_dirent_safe(mddev->sysfs_action);
9467 if (mddev->event_work.func)
9468 queue_work(md_misc_wq, &mddev->event_work);
9470 EXPORT_SYMBOL(md_reap_sync_thread);
9472 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9474 sysfs_notify_dirent_safe(rdev->sysfs_state);
9475 wait_event_timeout(rdev->blocked_wait,
9476 !test_bit(Blocked, &rdev->flags) &&
9477 !test_bit(BlockedBadBlocks, &rdev->flags),
9478 msecs_to_jiffies(5000));
9479 rdev_dec_pending(rdev, mddev);
9481 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9483 void md_finish_reshape(struct mddev *mddev)
9485 /* called be personality module when reshape completes. */
9486 struct md_rdev *rdev;
9488 rdev_for_each(rdev, mddev) {
9489 if (rdev->data_offset > rdev->new_data_offset)
9490 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9492 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9493 rdev->data_offset = rdev->new_data_offset;
9496 EXPORT_SYMBOL(md_finish_reshape);
9498 /* Bad block management */
9500 /* Returns 1 on success, 0 on failure */
9501 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9504 struct mddev *mddev = rdev->mddev;
9507 s += rdev->new_data_offset;
9509 s += rdev->data_offset;
9510 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9512 /* Make sure they get written out promptly */
9513 if (test_bit(ExternalBbl, &rdev->flags))
9514 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9515 sysfs_notify_dirent_safe(rdev->sysfs_state);
9516 set_mask_bits(&mddev->sb_flags, 0,
9517 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9518 md_wakeup_thread(rdev->mddev->thread);
9523 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9525 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9530 s += rdev->new_data_offset;
9532 s += rdev->data_offset;
9533 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9534 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9535 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9538 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9540 static int md_notify_reboot(struct notifier_block *this,
9541 unsigned long code, void *x)
9543 struct list_head *tmp;
9544 struct mddev *mddev;
9547 for_each_mddev(mddev, tmp) {
9548 if (mddev_trylock(mddev)) {
9550 __md_stop_writes(mddev);
9551 if (mddev->persistent)
9552 mddev->safemode = 2;
9553 mddev_unlock(mddev);
9558 * certain more exotic SCSI devices are known to be
9559 * volatile wrt too early system reboots. While the
9560 * right place to handle this issue is the given
9561 * driver, we do want to have a safe RAID driver ...
9569 static struct notifier_block md_notifier = {
9570 .notifier_call = md_notify_reboot,
9572 .priority = INT_MAX, /* before any real devices */
9575 static void md_geninit(void)
9577 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9579 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9582 static int __init md_init(void)
9586 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9590 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9594 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9595 if (!md_rdev_misc_wq)
9596 goto err_rdev_misc_wq;
9598 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9602 ret = __register_blkdev(0, "mdp", md_probe);
9607 register_reboot_notifier(&md_notifier);
9608 raid_table_header = register_sysctl_table(raid_root_table);
9614 unregister_blkdev(MD_MAJOR, "md");
9616 destroy_workqueue(md_rdev_misc_wq);
9618 destroy_workqueue(md_misc_wq);
9620 destroy_workqueue(md_wq);
9625 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9627 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9628 struct md_rdev *rdev2, *tmp;
9630 char b[BDEVNAME_SIZE];
9633 * If size is changed in another node then we need to
9634 * do resize as well.
9636 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9637 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9639 pr_info("md-cluster: resize failed\n");
9641 md_bitmap_update_sb(mddev->bitmap);
9644 /* Check for change of roles in the active devices */
9645 rdev_for_each_safe(rdev2, tmp, mddev) {
9646 if (test_bit(Faulty, &rdev2->flags))
9649 /* Check if the roles changed */
9650 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9652 if (test_bit(Candidate, &rdev2->flags)) {
9653 if (role == 0xfffe) {
9654 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9655 md_kick_rdev_from_array(rdev2);
9659 clear_bit(Candidate, &rdev2->flags);
9662 if (role != rdev2->raid_disk) {
9664 * got activated except reshape is happening.
9666 if (rdev2->raid_disk == -1 && role != 0xffff &&
9667 !(le32_to_cpu(sb->feature_map) &
9668 MD_FEATURE_RESHAPE_ACTIVE)) {
9669 rdev2->saved_raid_disk = role;
9670 ret = remove_and_add_spares(mddev, rdev2);
9671 pr_info("Activated spare: %s\n",
9672 bdevname(rdev2->bdev,b));
9673 /* wakeup mddev->thread here, so array could
9674 * perform resync with the new activated disk */
9675 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9676 md_wakeup_thread(mddev->thread);
9679 * We just want to do the minimum to mark the disk
9680 * as faulty. The recovery is performed by the
9681 * one who initiated the error.
9683 if ((role == 0xfffe) || (role == 0xfffd)) {
9684 md_error(mddev, rdev2);
9685 clear_bit(Blocked, &rdev2->flags);
9690 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9691 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9693 pr_warn("md: updating array disks failed. %d\n", ret);
9697 * Since mddev->delta_disks has already updated in update_raid_disks,
9698 * so it is time to check reshape.
9700 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9701 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9703 * reshape is happening in the remote node, we need to
9704 * update reshape_position and call start_reshape.
9706 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9707 if (mddev->pers->update_reshape_pos)
9708 mddev->pers->update_reshape_pos(mddev);
9709 if (mddev->pers->start_reshape)
9710 mddev->pers->start_reshape(mddev);
9711 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9712 mddev->reshape_position != MaxSector &&
9713 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9714 /* reshape is just done in another node. */
9715 mddev->reshape_position = MaxSector;
9716 if (mddev->pers->update_reshape_pos)
9717 mddev->pers->update_reshape_pos(mddev);
9720 /* Finally set the event to be up to date */
9721 mddev->events = le64_to_cpu(sb->events);
9724 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9727 struct page *swapout = rdev->sb_page;
9728 struct mdp_superblock_1 *sb;
9730 /* Store the sb page of the rdev in the swapout temporary
9731 * variable in case we err in the future
9733 rdev->sb_page = NULL;
9734 err = alloc_disk_sb(rdev);
9736 ClearPageUptodate(rdev->sb_page);
9737 rdev->sb_loaded = 0;
9738 err = super_types[mddev->major_version].
9739 load_super(rdev, NULL, mddev->minor_version);
9742 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9743 __func__, __LINE__, rdev->desc_nr, err);
9745 put_page(rdev->sb_page);
9746 rdev->sb_page = swapout;
9747 rdev->sb_loaded = 1;
9751 sb = page_address(rdev->sb_page);
9752 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9756 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9757 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9759 /* The other node finished recovery, call spare_active to set
9760 * device In_sync and mddev->degraded
9762 if (rdev->recovery_offset == MaxSector &&
9763 !test_bit(In_sync, &rdev->flags) &&
9764 mddev->pers->spare_active(mddev))
9765 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9771 void md_reload_sb(struct mddev *mddev, int nr)
9773 struct md_rdev *rdev;
9777 rdev_for_each_rcu(rdev, mddev) {
9778 if (rdev->desc_nr == nr)
9782 if (!rdev || rdev->desc_nr != nr) {
9783 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9787 err = read_rdev(mddev, rdev);
9791 check_sb_changes(mddev, rdev);
9793 /* Read all rdev's to update recovery_offset */
9794 rdev_for_each_rcu(rdev, mddev) {
9795 if (!test_bit(Faulty, &rdev->flags))
9796 read_rdev(mddev, rdev);
9799 EXPORT_SYMBOL(md_reload_sb);
9804 * Searches all registered partitions for autorun RAID arrays
9808 static DEFINE_MUTEX(detected_devices_mutex);
9809 static LIST_HEAD(all_detected_devices);
9810 struct detected_devices_node {
9811 struct list_head list;
9815 void md_autodetect_dev(dev_t dev)
9817 struct detected_devices_node *node_detected_dev;
9819 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9820 if (node_detected_dev) {
9821 node_detected_dev->dev = dev;
9822 mutex_lock(&detected_devices_mutex);
9823 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9824 mutex_unlock(&detected_devices_mutex);
9828 void md_autostart_arrays(int part)
9830 struct md_rdev *rdev;
9831 struct detected_devices_node *node_detected_dev;
9833 int i_scanned, i_passed;
9838 pr_info("md: Autodetecting RAID arrays.\n");
9840 mutex_lock(&detected_devices_mutex);
9841 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9843 node_detected_dev = list_entry(all_detected_devices.next,
9844 struct detected_devices_node, list);
9845 list_del(&node_detected_dev->list);
9846 dev = node_detected_dev->dev;
9847 kfree(node_detected_dev);
9848 mutex_unlock(&detected_devices_mutex);
9849 rdev = md_import_device(dev,0, 90);
9850 mutex_lock(&detected_devices_mutex);
9854 if (test_bit(Faulty, &rdev->flags))
9857 set_bit(AutoDetected, &rdev->flags);
9858 list_add(&rdev->same_set, &pending_raid_disks);
9861 mutex_unlock(&detected_devices_mutex);
9863 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9865 autorun_devices(part);
9868 #endif /* !MODULE */
9870 static __exit void md_exit(void)
9872 struct mddev *mddev;
9873 struct list_head *tmp;
9876 unregister_blkdev(MD_MAJOR,"md");
9877 unregister_blkdev(mdp_major, "mdp");
9878 unregister_reboot_notifier(&md_notifier);
9879 unregister_sysctl_table(raid_table_header);
9881 /* We cannot unload the modules while some process is
9882 * waiting for us in select() or poll() - wake them up
9885 while (waitqueue_active(&md_event_waiters)) {
9886 /* not safe to leave yet */
9887 wake_up(&md_event_waiters);
9891 remove_proc_entry("mdstat", NULL);
9893 for_each_mddev(mddev, tmp) {
9894 export_array(mddev);
9896 mddev->hold_active = 0;
9898 * for_each_mddev() will call mddev_put() at the end of each
9899 * iteration. As the mddev is now fully clear, this will
9900 * schedule the mddev for destruction by a workqueue, and the
9901 * destroy_workqueue() below will wait for that to complete.
9904 destroy_workqueue(md_rdev_misc_wq);
9905 destroy_workqueue(md_misc_wq);
9906 destroy_workqueue(md_wq);
9909 subsys_initcall(md_init);
9910 module_exit(md_exit)
9912 static int get_ro(char *buffer, const struct kernel_param *kp)
9914 return sprintf(buffer, "%d\n", start_readonly);
9916 static int set_ro(const char *val, const struct kernel_param *kp)
9918 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9921 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9922 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9923 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9924 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9926 MODULE_LICENSE("GPL");
9927 MODULE_DESCRIPTION("MD RAID framework");
9929 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);