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 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
894 static int alloc_disk_sb(struct md_rdev *rdev)
896 rdev->sb_page = alloc_page(GFP_KERNEL);
902 void md_rdev_clear(struct md_rdev *rdev)
905 put_page(rdev->sb_page);
907 rdev->sb_page = NULL;
912 put_page(rdev->bb_page);
913 rdev->bb_page = NULL;
915 badblocks_exit(&rdev->badblocks);
917 EXPORT_SYMBOL_GPL(md_rdev_clear);
919 static void super_written(struct bio *bio)
921 struct md_rdev *rdev = bio->bi_private;
922 struct mddev *mddev = rdev->mddev;
924 if (bio->bi_status) {
925 pr_err("md: %s gets error=%d\n", __func__,
926 blk_status_to_errno(bio->bi_status));
927 md_error(mddev, rdev);
928 if (!test_bit(Faulty, &rdev->flags)
929 && (bio->bi_opf & MD_FAILFAST)) {
930 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
931 set_bit(LastDev, &rdev->flags);
934 clear_bit(LastDev, &rdev->flags);
936 if (atomic_dec_and_test(&mddev->pending_writes))
937 wake_up(&mddev->sb_wait);
938 rdev_dec_pending(rdev, mddev);
942 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
943 sector_t sector, int size, struct page *page)
945 /* write first size bytes of page to sector of rdev
946 * Increment mddev->pending_writes before returning
947 * and decrement it on completion, waking up sb_wait
948 * if zero is reached.
949 * If an error occurred, call md_error
957 if (test_bit(Faulty, &rdev->flags))
960 bio = bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
962 atomic_inc(&rdev->nr_pending);
964 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
965 bio->bi_iter.bi_sector = sector;
966 bio_add_page(bio, page, size, 0);
967 bio->bi_private = rdev;
968 bio->bi_end_io = super_written;
970 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
971 test_bit(FailFast, &rdev->flags) &&
972 !test_bit(LastDev, &rdev->flags))
974 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
976 atomic_inc(&mddev->pending_writes);
980 int md_super_wait(struct mddev *mddev)
982 /* wait for all superblock writes that were scheduled to complete */
983 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
984 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
989 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
990 struct page *page, int op, int op_flags, bool metadata_op)
995 bio_init(&bio, &bvec, 1);
997 if (metadata_op && rdev->meta_bdev)
998 bio_set_dev(&bio, rdev->meta_bdev);
1000 bio_set_dev(&bio, rdev->bdev);
1001 bio.bi_opf = op | op_flags;
1003 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1004 else if (rdev->mddev->reshape_position != MaxSector &&
1005 (rdev->mddev->reshape_backwards ==
1006 (sector >= rdev->mddev->reshape_position)))
1007 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1009 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1010 bio_add_page(&bio, page, size, 0);
1012 submit_bio_wait(&bio);
1014 return !bio.bi_status;
1016 EXPORT_SYMBOL_GPL(sync_page_io);
1018 static int read_disk_sb(struct md_rdev *rdev, int size)
1020 char b[BDEVNAME_SIZE];
1022 if (rdev->sb_loaded)
1025 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1027 rdev->sb_loaded = 1;
1031 pr_err("md: disabled device %s, could not read superblock.\n",
1032 bdevname(rdev->bdev,b));
1036 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1038 return sb1->set_uuid0 == sb2->set_uuid0 &&
1039 sb1->set_uuid1 == sb2->set_uuid1 &&
1040 sb1->set_uuid2 == sb2->set_uuid2 &&
1041 sb1->set_uuid3 == sb2->set_uuid3;
1044 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1047 mdp_super_t *tmp1, *tmp2;
1049 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1050 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1052 if (!tmp1 || !tmp2) {
1061 * nr_disks is not constant
1066 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1073 static u32 md_csum_fold(u32 csum)
1075 csum = (csum & 0xffff) + (csum >> 16);
1076 return (csum & 0xffff) + (csum >> 16);
1079 static unsigned int calc_sb_csum(mdp_super_t *sb)
1082 u32 *sb32 = (u32*)sb;
1084 unsigned int disk_csum, csum;
1086 disk_csum = sb->sb_csum;
1089 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1091 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1094 /* This used to use csum_partial, which was wrong for several
1095 * reasons including that different results are returned on
1096 * different architectures. It isn't critical that we get exactly
1097 * the same return value as before (we always csum_fold before
1098 * testing, and that removes any differences). However as we
1099 * know that csum_partial always returned a 16bit value on
1100 * alphas, do a fold to maximise conformity to previous behaviour.
1102 sb->sb_csum = md_csum_fold(disk_csum);
1104 sb->sb_csum = disk_csum;
1110 * Handle superblock details.
1111 * We want to be able to handle multiple superblock formats
1112 * so we have a common interface to them all, and an array of
1113 * different handlers.
1114 * We rely on user-space to write the initial superblock, and support
1115 * reading and updating of superblocks.
1116 * Interface methods are:
1117 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1118 * loads and validates a superblock on dev.
1119 * if refdev != NULL, compare superblocks on both devices
1121 * 0 - dev has a superblock that is compatible with refdev
1122 * 1 - dev has a superblock that is compatible and newer than refdev
1123 * so dev should be used as the refdev in future
1124 * -EINVAL superblock incompatible or invalid
1125 * -othererror e.g. -EIO
1127 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1128 * Verify that dev is acceptable into mddev.
1129 * The first time, mddev->raid_disks will be 0, and data from
1130 * dev should be merged in. Subsequent calls check that dev
1131 * is new enough. Return 0 or -EINVAL
1133 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1134 * Update the superblock for rdev with data in mddev
1135 * This does not write to disc.
1141 struct module *owner;
1142 int (*load_super)(struct md_rdev *rdev,
1143 struct md_rdev *refdev,
1145 int (*validate_super)(struct mddev *mddev,
1146 struct md_rdev *rdev);
1147 void (*sync_super)(struct mddev *mddev,
1148 struct md_rdev *rdev);
1149 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1150 sector_t num_sectors);
1151 int (*allow_new_offset)(struct md_rdev *rdev,
1152 unsigned long long new_offset);
1156 * Check that the given mddev has no bitmap.
1158 * This function is called from the run method of all personalities that do not
1159 * support bitmaps. It prints an error message and returns non-zero if mddev
1160 * has a bitmap. Otherwise, it returns 0.
1163 int md_check_no_bitmap(struct mddev *mddev)
1165 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1167 pr_warn("%s: bitmaps are not supported for %s\n",
1168 mdname(mddev), mddev->pers->name);
1171 EXPORT_SYMBOL(md_check_no_bitmap);
1174 * load_super for 0.90.0
1176 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1178 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1181 bool spare_disk = true;
1184 * Calculate the position of the superblock (512byte sectors),
1185 * it's at the end of the disk.
1187 * It also happens to be a multiple of 4Kb.
1189 rdev->sb_start = calc_dev_sboffset(rdev);
1191 ret = read_disk_sb(rdev, MD_SB_BYTES);
1197 bdevname(rdev->bdev, b);
1198 sb = page_address(rdev->sb_page);
1200 if (sb->md_magic != MD_SB_MAGIC) {
1201 pr_warn("md: invalid raid superblock magic on %s\n", b);
1205 if (sb->major_version != 0 ||
1206 sb->minor_version < 90 ||
1207 sb->minor_version > 91) {
1208 pr_warn("Bad version number %d.%d on %s\n",
1209 sb->major_version, sb->minor_version, b);
1213 if (sb->raid_disks <= 0)
1216 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1217 pr_warn("md: invalid superblock checksum on %s\n", b);
1221 rdev->preferred_minor = sb->md_minor;
1222 rdev->data_offset = 0;
1223 rdev->new_data_offset = 0;
1224 rdev->sb_size = MD_SB_BYTES;
1225 rdev->badblocks.shift = -1;
1227 if (sb->level == LEVEL_MULTIPATH)
1230 rdev->desc_nr = sb->this_disk.number;
1232 /* not spare disk, or LEVEL_MULTIPATH */
1233 if (sb->level == LEVEL_MULTIPATH ||
1234 (rdev->desc_nr >= 0 &&
1235 rdev->desc_nr < MD_SB_DISKS &&
1236 sb->disks[rdev->desc_nr].state &
1237 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1247 mdp_super_t *refsb = page_address(refdev->sb_page);
1248 if (!md_uuid_equal(refsb, sb)) {
1249 pr_warn("md: %s has different UUID to %s\n",
1250 b, bdevname(refdev->bdev,b2));
1253 if (!md_sb_equal(refsb, sb)) {
1254 pr_warn("md: %s has same UUID but different superblock to %s\n",
1255 b, bdevname(refdev->bdev, b2));
1259 ev2 = md_event(refsb);
1261 if (!spare_disk && ev1 > ev2)
1266 rdev->sectors = rdev->sb_start;
1267 /* Limit to 4TB as metadata cannot record more than that.
1268 * (not needed for Linear and RAID0 as metadata doesn't
1271 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1272 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1274 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1275 /* "this cannot possibly happen" ... */
1283 * validate_super for 0.90.0
1285 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1288 mdp_super_t *sb = page_address(rdev->sb_page);
1289 __u64 ev1 = md_event(sb);
1291 rdev->raid_disk = -1;
1292 clear_bit(Faulty, &rdev->flags);
1293 clear_bit(In_sync, &rdev->flags);
1294 clear_bit(Bitmap_sync, &rdev->flags);
1295 clear_bit(WriteMostly, &rdev->flags);
1297 if (mddev->raid_disks == 0) {
1298 mddev->major_version = 0;
1299 mddev->minor_version = sb->minor_version;
1300 mddev->patch_version = sb->patch_version;
1301 mddev->external = 0;
1302 mddev->chunk_sectors = sb->chunk_size >> 9;
1303 mddev->ctime = sb->ctime;
1304 mddev->utime = sb->utime;
1305 mddev->level = sb->level;
1306 mddev->clevel[0] = 0;
1307 mddev->layout = sb->layout;
1308 mddev->raid_disks = sb->raid_disks;
1309 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1310 mddev->events = ev1;
1311 mddev->bitmap_info.offset = 0;
1312 mddev->bitmap_info.space = 0;
1313 /* bitmap can use 60 K after the 4K superblocks */
1314 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1315 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1316 mddev->reshape_backwards = 0;
1318 if (mddev->minor_version >= 91) {
1319 mddev->reshape_position = sb->reshape_position;
1320 mddev->delta_disks = sb->delta_disks;
1321 mddev->new_level = sb->new_level;
1322 mddev->new_layout = sb->new_layout;
1323 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1324 if (mddev->delta_disks < 0)
1325 mddev->reshape_backwards = 1;
1327 mddev->reshape_position = MaxSector;
1328 mddev->delta_disks = 0;
1329 mddev->new_level = mddev->level;
1330 mddev->new_layout = mddev->layout;
1331 mddev->new_chunk_sectors = mddev->chunk_sectors;
1333 if (mddev->level == 0)
1336 if (sb->state & (1<<MD_SB_CLEAN))
1337 mddev->recovery_cp = MaxSector;
1339 if (sb->events_hi == sb->cp_events_hi &&
1340 sb->events_lo == sb->cp_events_lo) {
1341 mddev->recovery_cp = sb->recovery_cp;
1343 mddev->recovery_cp = 0;
1346 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1347 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1348 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1349 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1351 mddev->max_disks = MD_SB_DISKS;
1353 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1354 mddev->bitmap_info.file == NULL) {
1355 mddev->bitmap_info.offset =
1356 mddev->bitmap_info.default_offset;
1357 mddev->bitmap_info.space =
1358 mddev->bitmap_info.default_space;
1361 } else if (mddev->pers == NULL) {
1362 /* Insist on good event counter while assembling, except
1363 * for spares (which don't need an event count) */
1365 if (sb->disks[rdev->desc_nr].state & (
1366 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1367 if (ev1 < mddev->events)
1369 } else if (mddev->bitmap) {
1370 /* if adding to array with a bitmap, then we can accept an
1371 * older device ... but not too old.
1373 if (ev1 < mddev->bitmap->events_cleared)
1375 if (ev1 < mddev->events)
1376 set_bit(Bitmap_sync, &rdev->flags);
1378 if (ev1 < mddev->events)
1379 /* just a hot-add of a new device, leave raid_disk at -1 */
1383 if (mddev->level != LEVEL_MULTIPATH) {
1384 desc = sb->disks + rdev->desc_nr;
1386 if (desc->state & (1<<MD_DISK_FAULTY))
1387 set_bit(Faulty, &rdev->flags);
1388 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1389 desc->raid_disk < mddev->raid_disks */) {
1390 set_bit(In_sync, &rdev->flags);
1391 rdev->raid_disk = desc->raid_disk;
1392 rdev->saved_raid_disk = desc->raid_disk;
1393 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1394 /* active but not in sync implies recovery up to
1395 * reshape position. We don't know exactly where
1396 * that is, so set to zero for now */
1397 if (mddev->minor_version >= 91) {
1398 rdev->recovery_offset = 0;
1399 rdev->raid_disk = desc->raid_disk;
1402 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1403 set_bit(WriteMostly, &rdev->flags);
1404 if (desc->state & (1<<MD_DISK_FAILFAST))
1405 set_bit(FailFast, &rdev->flags);
1406 } else /* MULTIPATH are always insync */
1407 set_bit(In_sync, &rdev->flags);
1412 * sync_super for 0.90.0
1414 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1417 struct md_rdev *rdev2;
1418 int next_spare = mddev->raid_disks;
1420 /* make rdev->sb match mddev data..
1423 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1424 * 3/ any empty disks < next_spare become removed
1426 * disks[0] gets initialised to REMOVED because
1427 * we cannot be sure from other fields if it has
1428 * been initialised or not.
1431 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1433 rdev->sb_size = MD_SB_BYTES;
1435 sb = page_address(rdev->sb_page);
1437 memset(sb, 0, sizeof(*sb));
1439 sb->md_magic = MD_SB_MAGIC;
1440 sb->major_version = mddev->major_version;
1441 sb->patch_version = mddev->patch_version;
1442 sb->gvalid_words = 0; /* ignored */
1443 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1444 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1445 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1446 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1448 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1449 sb->level = mddev->level;
1450 sb->size = mddev->dev_sectors / 2;
1451 sb->raid_disks = mddev->raid_disks;
1452 sb->md_minor = mddev->md_minor;
1453 sb->not_persistent = 0;
1454 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1456 sb->events_hi = (mddev->events>>32);
1457 sb->events_lo = (u32)mddev->events;
1459 if (mddev->reshape_position == MaxSector)
1460 sb->minor_version = 90;
1462 sb->minor_version = 91;
1463 sb->reshape_position = mddev->reshape_position;
1464 sb->new_level = mddev->new_level;
1465 sb->delta_disks = mddev->delta_disks;
1466 sb->new_layout = mddev->new_layout;
1467 sb->new_chunk = mddev->new_chunk_sectors << 9;
1469 mddev->minor_version = sb->minor_version;
1472 sb->recovery_cp = mddev->recovery_cp;
1473 sb->cp_events_hi = (mddev->events>>32);
1474 sb->cp_events_lo = (u32)mddev->events;
1475 if (mddev->recovery_cp == MaxSector)
1476 sb->state = (1<< MD_SB_CLEAN);
1478 sb->recovery_cp = 0;
1480 sb->layout = mddev->layout;
1481 sb->chunk_size = mddev->chunk_sectors << 9;
1483 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1484 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1486 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1487 rdev_for_each(rdev2, mddev) {
1490 int is_active = test_bit(In_sync, &rdev2->flags);
1492 if (rdev2->raid_disk >= 0 &&
1493 sb->minor_version >= 91)
1494 /* we have nowhere to store the recovery_offset,
1495 * but if it is not below the reshape_position,
1496 * we can piggy-back on that.
1499 if (rdev2->raid_disk < 0 ||
1500 test_bit(Faulty, &rdev2->flags))
1503 desc_nr = rdev2->raid_disk;
1505 desc_nr = next_spare++;
1506 rdev2->desc_nr = desc_nr;
1507 d = &sb->disks[rdev2->desc_nr];
1509 d->number = rdev2->desc_nr;
1510 d->major = MAJOR(rdev2->bdev->bd_dev);
1511 d->minor = MINOR(rdev2->bdev->bd_dev);
1513 d->raid_disk = rdev2->raid_disk;
1515 d->raid_disk = rdev2->desc_nr; /* compatibility */
1516 if (test_bit(Faulty, &rdev2->flags))
1517 d->state = (1<<MD_DISK_FAULTY);
1518 else if (is_active) {
1519 d->state = (1<<MD_DISK_ACTIVE);
1520 if (test_bit(In_sync, &rdev2->flags))
1521 d->state |= (1<<MD_DISK_SYNC);
1529 if (test_bit(WriteMostly, &rdev2->flags))
1530 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1531 if (test_bit(FailFast, &rdev2->flags))
1532 d->state |= (1<<MD_DISK_FAILFAST);
1534 /* now set the "removed" and "faulty" bits on any missing devices */
1535 for (i=0 ; i < mddev->raid_disks ; i++) {
1536 mdp_disk_t *d = &sb->disks[i];
1537 if (d->state == 0 && d->number == 0) {
1540 d->state = (1<<MD_DISK_REMOVED);
1541 d->state |= (1<<MD_DISK_FAULTY);
1545 sb->nr_disks = nr_disks;
1546 sb->active_disks = active;
1547 sb->working_disks = working;
1548 sb->failed_disks = failed;
1549 sb->spare_disks = spare;
1551 sb->this_disk = sb->disks[rdev->desc_nr];
1552 sb->sb_csum = calc_sb_csum(sb);
1556 * rdev_size_change for 0.90.0
1558 static unsigned long long
1559 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1561 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1562 return 0; /* component must fit device */
1563 if (rdev->mddev->bitmap_info.offset)
1564 return 0; /* can't move bitmap */
1565 rdev->sb_start = calc_dev_sboffset(rdev);
1566 if (!num_sectors || num_sectors > rdev->sb_start)
1567 num_sectors = rdev->sb_start;
1568 /* Limit to 4TB as metadata cannot record more than that.
1569 * 4TB == 2^32 KB, or 2*2^32 sectors.
1571 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1572 num_sectors = (sector_t)(2ULL << 32) - 2;
1574 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1576 } while (md_super_wait(rdev->mddev) < 0);
1581 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1583 /* non-zero offset changes not possible with v0.90 */
1584 return new_offset == 0;
1588 * version 1 superblock
1591 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1595 unsigned long long newcsum;
1596 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1597 __le32 *isuper = (__le32*)sb;
1599 disk_csum = sb->sb_csum;
1602 for (; size >= 4; size -= 4)
1603 newcsum += le32_to_cpu(*isuper++);
1606 newcsum += le16_to_cpu(*(__le16*) isuper);
1608 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1609 sb->sb_csum = disk_csum;
1610 return cpu_to_le32(csum);
1613 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1615 struct mdp_superblock_1 *sb;
1619 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1621 bool spare_disk = true;
1624 * Calculate the position of the superblock in 512byte sectors.
1625 * It is always aligned to a 4K boundary and
1626 * depeding on minor_version, it can be:
1627 * 0: At least 8K, but less than 12K, from end of device
1628 * 1: At start of device
1629 * 2: 4K from start of device.
1631 switch(minor_version) {
1633 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1634 sb_start &= ~(sector_t)(4*2-1);
1645 rdev->sb_start = sb_start;
1647 /* superblock is rarely larger than 1K, but it can be larger,
1648 * and it is safe to read 4k, so we do that
1650 ret = read_disk_sb(rdev, 4096);
1651 if (ret) return ret;
1653 sb = page_address(rdev->sb_page);
1655 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1656 sb->major_version != cpu_to_le32(1) ||
1657 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1658 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1659 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1662 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1663 pr_warn("md: invalid superblock checksum on %s\n",
1664 bdevname(rdev->bdev,b));
1667 if (le64_to_cpu(sb->data_size) < 10) {
1668 pr_warn("md: data_size too small on %s\n",
1669 bdevname(rdev->bdev,b));
1674 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1675 /* Some padding is non-zero, might be a new feature */
1678 rdev->preferred_minor = 0xffff;
1679 rdev->data_offset = le64_to_cpu(sb->data_offset);
1680 rdev->new_data_offset = rdev->data_offset;
1681 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1682 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1683 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1684 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1686 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1687 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1688 if (rdev->sb_size & bmask)
1689 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1692 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1695 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1698 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1701 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1703 if (!rdev->bb_page) {
1704 rdev->bb_page = alloc_page(GFP_KERNEL);
1708 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1709 rdev->badblocks.count == 0) {
1710 /* need to load the bad block list.
1711 * Currently we limit it to one page.
1717 int sectors = le16_to_cpu(sb->bblog_size);
1718 if (sectors > (PAGE_SIZE / 512))
1720 offset = le32_to_cpu(sb->bblog_offset);
1723 bb_sector = (long long)offset;
1724 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1725 rdev->bb_page, REQ_OP_READ, 0, true))
1727 bbp = (__le64 *)page_address(rdev->bb_page);
1728 rdev->badblocks.shift = sb->bblog_shift;
1729 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1730 u64 bb = le64_to_cpu(*bbp);
1731 int count = bb & (0x3ff);
1732 u64 sector = bb >> 10;
1733 sector <<= sb->bblog_shift;
1734 count <<= sb->bblog_shift;
1737 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1740 } else if (sb->bblog_offset != 0)
1741 rdev->badblocks.shift = 0;
1743 if ((le32_to_cpu(sb->feature_map) &
1744 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1745 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1746 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1747 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1750 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1754 /* not spare disk, or LEVEL_MULTIPATH */
1755 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1756 (rdev->desc_nr >= 0 &&
1757 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1758 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1759 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1769 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1771 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1772 sb->level != refsb->level ||
1773 sb->layout != refsb->layout ||
1774 sb->chunksize != refsb->chunksize) {
1775 pr_warn("md: %s has strangely different superblock to %s\n",
1776 bdevname(rdev->bdev,b),
1777 bdevname(refdev->bdev,b2));
1780 ev1 = le64_to_cpu(sb->events);
1781 ev2 = le64_to_cpu(refsb->events);
1783 if (!spare_disk && ev1 > ev2)
1789 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1791 sectors = rdev->sb_start;
1792 if (sectors < le64_to_cpu(sb->data_size))
1794 rdev->sectors = le64_to_cpu(sb->data_size);
1798 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1800 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1801 __u64 ev1 = le64_to_cpu(sb->events);
1803 rdev->raid_disk = -1;
1804 clear_bit(Faulty, &rdev->flags);
1805 clear_bit(In_sync, &rdev->flags);
1806 clear_bit(Bitmap_sync, &rdev->flags);
1807 clear_bit(WriteMostly, &rdev->flags);
1809 if (mddev->raid_disks == 0) {
1810 mddev->major_version = 1;
1811 mddev->patch_version = 0;
1812 mddev->external = 0;
1813 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1814 mddev->ctime = le64_to_cpu(sb->ctime);
1815 mddev->utime = le64_to_cpu(sb->utime);
1816 mddev->level = le32_to_cpu(sb->level);
1817 mddev->clevel[0] = 0;
1818 mddev->layout = le32_to_cpu(sb->layout);
1819 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1820 mddev->dev_sectors = le64_to_cpu(sb->size);
1821 mddev->events = ev1;
1822 mddev->bitmap_info.offset = 0;
1823 mddev->bitmap_info.space = 0;
1824 /* Default location for bitmap is 1K after superblock
1825 * using 3K - total of 4K
1827 mddev->bitmap_info.default_offset = 1024 >> 9;
1828 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1829 mddev->reshape_backwards = 0;
1831 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1832 memcpy(mddev->uuid, sb->set_uuid, 16);
1834 mddev->max_disks = (4096-256)/2;
1836 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1837 mddev->bitmap_info.file == NULL) {
1838 mddev->bitmap_info.offset =
1839 (__s32)le32_to_cpu(sb->bitmap_offset);
1840 /* Metadata doesn't record how much space is available.
1841 * For 1.0, we assume we can use up to the superblock
1842 * if before, else to 4K beyond superblock.
1843 * For others, assume no change is possible.
1845 if (mddev->minor_version > 0)
1846 mddev->bitmap_info.space = 0;
1847 else if (mddev->bitmap_info.offset > 0)
1848 mddev->bitmap_info.space =
1849 8 - mddev->bitmap_info.offset;
1851 mddev->bitmap_info.space =
1852 -mddev->bitmap_info.offset;
1855 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1856 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1857 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1858 mddev->new_level = le32_to_cpu(sb->new_level);
1859 mddev->new_layout = le32_to_cpu(sb->new_layout);
1860 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1861 if (mddev->delta_disks < 0 ||
1862 (mddev->delta_disks == 0 &&
1863 (le32_to_cpu(sb->feature_map)
1864 & MD_FEATURE_RESHAPE_BACKWARDS)))
1865 mddev->reshape_backwards = 1;
1867 mddev->reshape_position = MaxSector;
1868 mddev->delta_disks = 0;
1869 mddev->new_level = mddev->level;
1870 mddev->new_layout = mddev->layout;
1871 mddev->new_chunk_sectors = mddev->chunk_sectors;
1874 if (mddev->level == 0 &&
1875 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1878 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1879 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1881 if (le32_to_cpu(sb->feature_map) &
1882 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1883 if (le32_to_cpu(sb->feature_map) &
1884 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1886 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1887 (le32_to_cpu(sb->feature_map) &
1888 MD_FEATURE_MULTIPLE_PPLS))
1890 set_bit(MD_HAS_PPL, &mddev->flags);
1892 } else if (mddev->pers == NULL) {
1893 /* Insist of good event counter while assembling, except for
1894 * spares (which don't need an event count) */
1896 if (rdev->desc_nr >= 0 &&
1897 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1898 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1899 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1900 if (ev1 < mddev->events)
1902 } else if (mddev->bitmap) {
1903 /* If adding to array with a bitmap, then we can accept an
1904 * older device, but not too old.
1906 if (ev1 < mddev->bitmap->events_cleared)
1908 if (ev1 < mddev->events)
1909 set_bit(Bitmap_sync, &rdev->flags);
1911 if (ev1 < mddev->events)
1912 /* just a hot-add of a new device, leave raid_disk at -1 */
1915 if (mddev->level != LEVEL_MULTIPATH) {
1917 if (rdev->desc_nr < 0 ||
1918 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1919 role = MD_DISK_ROLE_SPARE;
1922 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1924 case MD_DISK_ROLE_SPARE: /* spare */
1926 case MD_DISK_ROLE_FAULTY: /* faulty */
1927 set_bit(Faulty, &rdev->flags);
1929 case MD_DISK_ROLE_JOURNAL: /* journal device */
1930 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1931 /* journal device without journal feature */
1932 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1935 set_bit(Journal, &rdev->flags);
1936 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1937 rdev->raid_disk = 0;
1940 rdev->saved_raid_disk = role;
1941 if ((le32_to_cpu(sb->feature_map) &
1942 MD_FEATURE_RECOVERY_OFFSET)) {
1943 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1944 if (!(le32_to_cpu(sb->feature_map) &
1945 MD_FEATURE_RECOVERY_BITMAP))
1946 rdev->saved_raid_disk = -1;
1949 * If the array is FROZEN, then the device can't
1950 * be in_sync with rest of array.
1952 if (!test_bit(MD_RECOVERY_FROZEN,
1954 set_bit(In_sync, &rdev->flags);
1956 rdev->raid_disk = role;
1959 if (sb->devflags & WriteMostly1)
1960 set_bit(WriteMostly, &rdev->flags);
1961 if (sb->devflags & FailFast1)
1962 set_bit(FailFast, &rdev->flags);
1963 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1964 set_bit(Replacement, &rdev->flags);
1965 } else /* MULTIPATH are always insync */
1966 set_bit(In_sync, &rdev->flags);
1971 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1973 struct mdp_superblock_1 *sb;
1974 struct md_rdev *rdev2;
1976 /* make rdev->sb match mddev and rdev data. */
1978 sb = page_address(rdev->sb_page);
1980 sb->feature_map = 0;
1982 sb->recovery_offset = cpu_to_le64(0);
1983 memset(sb->pad3, 0, sizeof(sb->pad3));
1985 sb->utime = cpu_to_le64((__u64)mddev->utime);
1986 sb->events = cpu_to_le64(mddev->events);
1988 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1989 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1990 sb->resync_offset = cpu_to_le64(MaxSector);
1992 sb->resync_offset = cpu_to_le64(0);
1994 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1996 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1997 sb->size = cpu_to_le64(mddev->dev_sectors);
1998 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1999 sb->level = cpu_to_le32(mddev->level);
2000 sb->layout = cpu_to_le32(mddev->layout);
2001 if (test_bit(FailFast, &rdev->flags))
2002 sb->devflags |= FailFast1;
2004 sb->devflags &= ~FailFast1;
2006 if (test_bit(WriteMostly, &rdev->flags))
2007 sb->devflags |= WriteMostly1;
2009 sb->devflags &= ~WriteMostly1;
2010 sb->data_offset = cpu_to_le64(rdev->data_offset);
2011 sb->data_size = cpu_to_le64(rdev->sectors);
2013 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2014 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2015 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2018 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2019 !test_bit(In_sync, &rdev->flags)) {
2021 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2022 sb->recovery_offset =
2023 cpu_to_le64(rdev->recovery_offset);
2024 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2026 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2028 /* Note: recovery_offset and journal_tail share space */
2029 if (test_bit(Journal, &rdev->flags))
2030 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2031 if (test_bit(Replacement, &rdev->flags))
2033 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2035 if (mddev->reshape_position != MaxSector) {
2036 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2037 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2038 sb->new_layout = cpu_to_le32(mddev->new_layout);
2039 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2040 sb->new_level = cpu_to_le32(mddev->new_level);
2041 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2042 if (mddev->delta_disks == 0 &&
2043 mddev->reshape_backwards)
2045 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2046 if (rdev->new_data_offset != rdev->data_offset) {
2048 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2049 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2050 - rdev->data_offset));
2054 if (mddev_is_clustered(mddev))
2055 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2057 if (rdev->badblocks.count == 0)
2058 /* Nothing to do for bad blocks*/ ;
2059 else if (sb->bblog_offset == 0)
2060 /* Cannot record bad blocks on this device */
2061 md_error(mddev, rdev);
2063 struct badblocks *bb = &rdev->badblocks;
2064 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2066 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2071 seq = read_seqbegin(&bb->lock);
2073 memset(bbp, 0xff, PAGE_SIZE);
2075 for (i = 0 ; i < bb->count ; i++) {
2076 u64 internal_bb = p[i];
2077 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2078 | BB_LEN(internal_bb));
2079 bbp[i] = cpu_to_le64(store_bb);
2082 if (read_seqretry(&bb->lock, seq))
2085 bb->sector = (rdev->sb_start +
2086 (int)le32_to_cpu(sb->bblog_offset));
2087 bb->size = le16_to_cpu(sb->bblog_size);
2092 rdev_for_each(rdev2, mddev)
2093 if (rdev2->desc_nr+1 > max_dev)
2094 max_dev = rdev2->desc_nr+1;
2096 if (max_dev > le32_to_cpu(sb->max_dev)) {
2098 sb->max_dev = cpu_to_le32(max_dev);
2099 rdev->sb_size = max_dev * 2 + 256;
2100 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2101 if (rdev->sb_size & bmask)
2102 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2104 max_dev = le32_to_cpu(sb->max_dev);
2106 for (i=0; i<max_dev;i++)
2107 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2109 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2110 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2112 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2113 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2115 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2117 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2118 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2119 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2122 rdev_for_each(rdev2, mddev) {
2124 if (test_bit(Faulty, &rdev2->flags))
2125 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2126 else if (test_bit(In_sync, &rdev2->flags))
2127 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2128 else if (test_bit(Journal, &rdev2->flags))
2129 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2130 else if (rdev2->raid_disk >= 0)
2131 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2133 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2136 sb->sb_csum = calc_sb_1_csum(sb);
2139 static sector_t super_1_choose_bm_space(sector_t dev_size)
2143 /* if the device is bigger than 8Gig, save 64k for bitmap
2144 * usage, if bigger than 200Gig, save 128k
2146 if (dev_size < 64*2)
2148 else if (dev_size - 64*2 >= 200*1024*1024*2)
2150 else if (dev_size - 4*2 > 8*1024*1024*2)
2157 static unsigned long long
2158 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2160 struct mdp_superblock_1 *sb;
2161 sector_t max_sectors;
2162 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2163 return 0; /* component must fit device */
2164 if (rdev->data_offset != rdev->new_data_offset)
2165 return 0; /* too confusing */
2166 if (rdev->sb_start < rdev->data_offset) {
2167 /* minor versions 1 and 2; superblock before data */
2168 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2169 if (!num_sectors || num_sectors > max_sectors)
2170 num_sectors = max_sectors;
2171 } else if (rdev->mddev->bitmap_info.offset) {
2172 /* minor version 0 with bitmap we can't move */
2175 /* minor version 0; superblock after data */
2176 sector_t sb_start, bm_space;
2177 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2179 /* 8K is for superblock */
2180 sb_start = dev_size - 8*2;
2181 sb_start &= ~(sector_t)(4*2 - 1);
2183 bm_space = super_1_choose_bm_space(dev_size);
2185 /* Space that can be used to store date needs to decrease
2186 * superblock bitmap space and bad block space(4K)
2188 max_sectors = sb_start - bm_space - 4*2;
2190 if (!num_sectors || num_sectors > max_sectors)
2191 num_sectors = max_sectors;
2193 sb = page_address(rdev->sb_page);
2194 sb->data_size = cpu_to_le64(num_sectors);
2195 sb->super_offset = cpu_to_le64(rdev->sb_start);
2196 sb->sb_csum = calc_sb_1_csum(sb);
2198 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2200 } while (md_super_wait(rdev->mddev) < 0);
2206 super_1_allow_new_offset(struct md_rdev *rdev,
2207 unsigned long long new_offset)
2209 /* All necessary checks on new >= old have been done */
2210 struct bitmap *bitmap;
2211 if (new_offset >= rdev->data_offset)
2214 /* with 1.0 metadata, there is no metadata to tread on
2215 * so we can always move back */
2216 if (rdev->mddev->minor_version == 0)
2219 /* otherwise we must be sure not to step on
2220 * any metadata, so stay:
2221 * 36K beyond start of superblock
2222 * beyond end of badblocks
2223 * beyond write-intent bitmap
2225 if (rdev->sb_start + (32+4)*2 > new_offset)
2227 bitmap = rdev->mddev->bitmap;
2228 if (bitmap && !rdev->mddev->bitmap_info.file &&
2229 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2230 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2232 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2238 static struct super_type super_types[] = {
2241 .owner = THIS_MODULE,
2242 .load_super = super_90_load,
2243 .validate_super = super_90_validate,
2244 .sync_super = super_90_sync,
2245 .rdev_size_change = super_90_rdev_size_change,
2246 .allow_new_offset = super_90_allow_new_offset,
2250 .owner = THIS_MODULE,
2251 .load_super = super_1_load,
2252 .validate_super = super_1_validate,
2253 .sync_super = super_1_sync,
2254 .rdev_size_change = super_1_rdev_size_change,
2255 .allow_new_offset = super_1_allow_new_offset,
2259 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2261 if (mddev->sync_super) {
2262 mddev->sync_super(mddev, rdev);
2266 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2268 super_types[mddev->major_version].sync_super(mddev, rdev);
2271 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2273 struct md_rdev *rdev, *rdev2;
2276 rdev_for_each_rcu(rdev, mddev1) {
2277 if (test_bit(Faulty, &rdev->flags) ||
2278 test_bit(Journal, &rdev->flags) ||
2279 rdev->raid_disk == -1)
2281 rdev_for_each_rcu(rdev2, mddev2) {
2282 if (test_bit(Faulty, &rdev2->flags) ||
2283 test_bit(Journal, &rdev2->flags) ||
2284 rdev2->raid_disk == -1)
2286 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2296 static LIST_HEAD(pending_raid_disks);
2299 * Try to register data integrity profile for an mddev
2301 * This is called when an array is started and after a disk has been kicked
2302 * from the array. It only succeeds if all working and active component devices
2303 * are integrity capable with matching profiles.
2305 int md_integrity_register(struct mddev *mddev)
2307 struct md_rdev *rdev, *reference = NULL;
2309 if (list_empty(&mddev->disks))
2310 return 0; /* nothing to do */
2311 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2312 return 0; /* shouldn't register, or already is */
2313 rdev_for_each(rdev, mddev) {
2314 /* skip spares and non-functional disks */
2315 if (test_bit(Faulty, &rdev->flags))
2317 if (rdev->raid_disk < 0)
2320 /* Use the first rdev as the reference */
2324 /* does this rdev's profile match the reference profile? */
2325 if (blk_integrity_compare(reference->bdev->bd_disk,
2326 rdev->bdev->bd_disk) < 0)
2329 if (!reference || !bdev_get_integrity(reference->bdev))
2332 * All component devices are integrity capable and have matching
2333 * profiles, register the common profile for the md device.
2335 blk_integrity_register(mddev->gendisk,
2336 bdev_get_integrity(reference->bdev));
2338 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2339 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2340 (mddev->level != 1 && mddev->level != 10 &&
2341 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2343 * No need to handle the failure of bioset_integrity_create,
2344 * because the function is called by md_run() -> pers->run(),
2345 * md_run calls bioset_exit -> bioset_integrity_free in case
2348 pr_err("md: failed to create integrity pool for %s\n",
2354 EXPORT_SYMBOL(md_integrity_register);
2357 * Attempt to add an rdev, but only if it is consistent with the current
2360 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2362 struct blk_integrity *bi_mddev;
2363 char name[BDEVNAME_SIZE];
2365 if (!mddev->gendisk)
2368 bi_mddev = blk_get_integrity(mddev->gendisk);
2370 if (!bi_mddev) /* nothing to do */
2373 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2374 pr_err("%s: incompatible integrity profile for %s\n",
2375 mdname(mddev), bdevname(rdev->bdev, name));
2381 EXPORT_SYMBOL(md_integrity_add_rdev);
2383 static bool rdev_read_only(struct md_rdev *rdev)
2385 return bdev_read_only(rdev->bdev) ||
2386 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2389 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2391 char b[BDEVNAME_SIZE];
2394 /* prevent duplicates */
2395 if (find_rdev(mddev, rdev->bdev->bd_dev))
2398 if (rdev_read_only(rdev) && mddev->pers)
2401 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2402 if (!test_bit(Journal, &rdev->flags) &&
2404 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2406 /* Cannot change size, so fail
2407 * If mddev->level <= 0, then we don't care
2408 * about aligning sizes (e.g. linear)
2410 if (mddev->level > 0)
2413 mddev->dev_sectors = rdev->sectors;
2416 /* Verify rdev->desc_nr is unique.
2417 * If it is -1, assign a free number, else
2418 * check number is not in use
2421 if (rdev->desc_nr < 0) {
2424 choice = mddev->raid_disks;
2425 while (md_find_rdev_nr_rcu(mddev, choice))
2427 rdev->desc_nr = choice;
2429 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2435 if (!test_bit(Journal, &rdev->flags) &&
2436 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2437 pr_warn("md: %s: array is limited to %d devices\n",
2438 mdname(mddev), mddev->max_disks);
2441 bdevname(rdev->bdev,b);
2442 strreplace(b, '/', '!');
2444 rdev->mddev = mddev;
2445 pr_debug("md: bind<%s>\n", b);
2447 if (mddev->raid_disks)
2448 mddev_create_serial_pool(mddev, rdev, false);
2450 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2453 /* failure here is OK */
2454 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2455 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2456 rdev->sysfs_unack_badblocks =
2457 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2458 rdev->sysfs_badblocks =
2459 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2461 list_add_rcu(&rdev->same_set, &mddev->disks);
2462 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2464 /* May as well allow recovery to be retried once */
2465 mddev->recovery_disabled++;
2470 pr_warn("md: failed to register dev-%s for %s\n",
2475 static void rdev_delayed_delete(struct work_struct *ws)
2477 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2478 kobject_del(&rdev->kobj);
2479 kobject_put(&rdev->kobj);
2482 static void unbind_rdev_from_array(struct md_rdev *rdev)
2484 char b[BDEVNAME_SIZE];
2486 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2487 list_del_rcu(&rdev->same_set);
2488 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2489 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2491 sysfs_remove_link(&rdev->kobj, "block");
2492 sysfs_put(rdev->sysfs_state);
2493 sysfs_put(rdev->sysfs_unack_badblocks);
2494 sysfs_put(rdev->sysfs_badblocks);
2495 rdev->sysfs_state = NULL;
2496 rdev->sysfs_unack_badblocks = NULL;
2497 rdev->sysfs_badblocks = NULL;
2498 rdev->badblocks.count = 0;
2499 /* We need to delay this, otherwise we can deadlock when
2500 * writing to 'remove' to "dev/state". We also need
2501 * to delay it due to rcu usage.
2504 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2505 kobject_get(&rdev->kobj);
2506 queue_work(md_rdev_misc_wq, &rdev->del_work);
2510 * prevent the device from being mounted, repartitioned or
2511 * otherwise reused by a RAID array (or any other kernel
2512 * subsystem), by bd_claiming the device.
2514 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2517 struct block_device *bdev;
2519 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2520 shared ? (struct md_rdev *)lock_rdev : rdev);
2522 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2523 MAJOR(dev), MINOR(dev));
2524 return PTR_ERR(bdev);
2530 static void unlock_rdev(struct md_rdev *rdev)
2532 struct block_device *bdev = rdev->bdev;
2534 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2537 void md_autodetect_dev(dev_t dev);
2539 static void export_rdev(struct md_rdev *rdev)
2541 char b[BDEVNAME_SIZE];
2543 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2544 md_rdev_clear(rdev);
2546 if (test_bit(AutoDetected, &rdev->flags))
2547 md_autodetect_dev(rdev->bdev->bd_dev);
2550 kobject_put(&rdev->kobj);
2553 void md_kick_rdev_from_array(struct md_rdev *rdev)
2555 unbind_rdev_from_array(rdev);
2558 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2560 static void export_array(struct mddev *mddev)
2562 struct md_rdev *rdev;
2564 while (!list_empty(&mddev->disks)) {
2565 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2567 md_kick_rdev_from_array(rdev);
2569 mddev->raid_disks = 0;
2570 mddev->major_version = 0;
2573 static bool set_in_sync(struct mddev *mddev)
2575 lockdep_assert_held(&mddev->lock);
2576 if (!mddev->in_sync) {
2577 mddev->sync_checkers++;
2578 spin_unlock(&mddev->lock);
2579 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2580 spin_lock(&mddev->lock);
2581 if (!mddev->in_sync &&
2582 percpu_ref_is_zero(&mddev->writes_pending)) {
2585 * Ensure ->in_sync is visible before we clear
2589 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2590 sysfs_notify_dirent_safe(mddev->sysfs_state);
2592 if (--mddev->sync_checkers == 0)
2593 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2595 if (mddev->safemode == 1)
2596 mddev->safemode = 0;
2597 return mddev->in_sync;
2600 static void sync_sbs(struct mddev *mddev, int nospares)
2602 /* Update each superblock (in-memory image), but
2603 * if we are allowed to, skip spares which already
2604 * have the right event counter, or have one earlier
2605 * (which would mean they aren't being marked as dirty
2606 * with the rest of the array)
2608 struct md_rdev *rdev;
2609 rdev_for_each(rdev, mddev) {
2610 if (rdev->sb_events == mddev->events ||
2612 rdev->raid_disk < 0 &&
2613 rdev->sb_events+1 == mddev->events)) {
2614 /* Don't update this superblock */
2615 rdev->sb_loaded = 2;
2617 sync_super(mddev, rdev);
2618 rdev->sb_loaded = 1;
2623 static bool does_sb_need_changing(struct mddev *mddev)
2625 struct md_rdev *rdev;
2626 struct mdp_superblock_1 *sb;
2629 /* Find a good rdev */
2630 rdev_for_each(rdev, mddev)
2631 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2634 /* No good device found. */
2638 sb = page_address(rdev->sb_page);
2639 /* Check if a device has become faulty or a spare become active */
2640 rdev_for_each(rdev, mddev) {
2641 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2642 /* Device activated? */
2643 if (role == 0xffff && rdev->raid_disk >=0 &&
2644 !test_bit(Faulty, &rdev->flags))
2646 /* Device turned faulty? */
2647 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2651 /* Check if any mddev parameters have changed */
2652 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2653 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2654 (mddev->layout != le32_to_cpu(sb->layout)) ||
2655 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2656 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2662 void md_update_sb(struct mddev *mddev, int force_change)
2664 struct md_rdev *rdev;
2667 int any_badblocks_changed = 0;
2672 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2677 if (mddev_is_clustered(mddev)) {
2678 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2680 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2682 ret = md_cluster_ops->metadata_update_start(mddev);
2683 /* Has someone else has updated the sb */
2684 if (!does_sb_need_changing(mddev)) {
2686 md_cluster_ops->metadata_update_cancel(mddev);
2687 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2688 BIT(MD_SB_CHANGE_DEVS) |
2689 BIT(MD_SB_CHANGE_CLEAN));
2695 * First make sure individual recovery_offsets are correct
2696 * curr_resync_completed can only be used during recovery.
2697 * During reshape/resync it might use array-addresses rather
2698 * that device addresses.
2700 rdev_for_each(rdev, mddev) {
2701 if (rdev->raid_disk >= 0 &&
2702 mddev->delta_disks >= 0 &&
2703 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2704 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2705 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2706 !test_bit(Journal, &rdev->flags) &&
2707 !test_bit(In_sync, &rdev->flags) &&
2708 mddev->curr_resync_completed > rdev->recovery_offset)
2709 rdev->recovery_offset = mddev->curr_resync_completed;
2712 if (!mddev->persistent) {
2713 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2714 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2715 if (!mddev->external) {
2716 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2717 rdev_for_each(rdev, mddev) {
2718 if (rdev->badblocks.changed) {
2719 rdev->badblocks.changed = 0;
2720 ack_all_badblocks(&rdev->badblocks);
2721 md_error(mddev, rdev);
2723 clear_bit(Blocked, &rdev->flags);
2724 clear_bit(BlockedBadBlocks, &rdev->flags);
2725 wake_up(&rdev->blocked_wait);
2728 wake_up(&mddev->sb_wait);
2732 spin_lock(&mddev->lock);
2734 mddev->utime = ktime_get_real_seconds();
2736 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2738 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2739 /* just a clean<-> dirty transition, possibly leave spares alone,
2740 * though if events isn't the right even/odd, we will have to do
2746 if (mddev->degraded)
2747 /* If the array is degraded, then skipping spares is both
2748 * dangerous and fairly pointless.
2749 * Dangerous because a device that was removed from the array
2750 * might have a event_count that still looks up-to-date,
2751 * so it can be re-added without a resync.
2752 * Pointless because if there are any spares to skip,
2753 * then a recovery will happen and soon that array won't
2754 * be degraded any more and the spare can go back to sleep then.
2758 sync_req = mddev->in_sync;
2760 /* If this is just a dirty<->clean transition, and the array is clean
2761 * and 'events' is odd, we can roll back to the previous clean state */
2763 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2764 && mddev->can_decrease_events
2765 && mddev->events != 1) {
2767 mddev->can_decrease_events = 0;
2769 /* otherwise we have to go forward and ... */
2771 mddev->can_decrease_events = nospares;
2775 * This 64-bit counter should never wrap.
2776 * Either we are in around ~1 trillion A.C., assuming
2777 * 1 reboot per second, or we have a bug...
2779 WARN_ON(mddev->events == 0);
2781 rdev_for_each(rdev, mddev) {
2782 if (rdev->badblocks.changed)
2783 any_badblocks_changed++;
2784 if (test_bit(Faulty, &rdev->flags))
2785 set_bit(FaultRecorded, &rdev->flags);
2788 sync_sbs(mddev, nospares);
2789 spin_unlock(&mddev->lock);
2791 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2792 mdname(mddev), mddev->in_sync);
2795 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2797 md_bitmap_update_sb(mddev->bitmap);
2798 rdev_for_each(rdev, mddev) {
2799 char b[BDEVNAME_SIZE];
2801 if (rdev->sb_loaded != 1)
2802 continue; /* no noise on spare devices */
2804 if (!test_bit(Faulty, &rdev->flags)) {
2805 md_super_write(mddev,rdev,
2806 rdev->sb_start, rdev->sb_size,
2808 pr_debug("md: (write) %s's sb offset: %llu\n",
2809 bdevname(rdev->bdev, b),
2810 (unsigned long long)rdev->sb_start);
2811 rdev->sb_events = mddev->events;
2812 if (rdev->badblocks.size) {
2813 md_super_write(mddev, rdev,
2814 rdev->badblocks.sector,
2815 rdev->badblocks.size << 9,
2817 rdev->badblocks.size = 0;
2821 pr_debug("md: %s (skipping faulty)\n",
2822 bdevname(rdev->bdev, b));
2824 if (mddev->level == LEVEL_MULTIPATH)
2825 /* only need to write one superblock... */
2828 if (md_super_wait(mddev) < 0)
2830 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2832 if (mddev_is_clustered(mddev) && ret == 0)
2833 md_cluster_ops->metadata_update_finish(mddev);
2835 if (mddev->in_sync != sync_req ||
2836 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2837 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2838 /* have to write it out again */
2840 wake_up(&mddev->sb_wait);
2841 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2842 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2844 rdev_for_each(rdev, mddev) {
2845 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2846 clear_bit(Blocked, &rdev->flags);
2848 if (any_badblocks_changed)
2849 ack_all_badblocks(&rdev->badblocks);
2850 clear_bit(BlockedBadBlocks, &rdev->flags);
2851 wake_up(&rdev->blocked_wait);
2854 EXPORT_SYMBOL(md_update_sb);
2856 static int add_bound_rdev(struct md_rdev *rdev)
2858 struct mddev *mddev = rdev->mddev;
2860 bool add_journal = test_bit(Journal, &rdev->flags);
2862 if (!mddev->pers->hot_remove_disk || add_journal) {
2863 /* If there is hot_add_disk but no hot_remove_disk
2864 * then added disks for geometry changes,
2865 * and should be added immediately.
2867 super_types[mddev->major_version].
2868 validate_super(mddev, rdev);
2870 mddev_suspend(mddev);
2871 err = mddev->pers->hot_add_disk(mddev, rdev);
2873 mddev_resume(mddev);
2875 md_kick_rdev_from_array(rdev);
2879 sysfs_notify_dirent_safe(rdev->sysfs_state);
2881 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2882 if (mddev->degraded)
2883 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2884 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2886 md_wakeup_thread(mddev->thread);
2890 /* words written to sysfs files may, or may not, be \n terminated.
2891 * We want to accept with case. For this we use cmd_match.
2893 static int cmd_match(const char *cmd, const char *str)
2895 /* See if cmd, written into a sysfs file, matches
2896 * str. They must either be the same, or cmd can
2897 * have a trailing newline
2899 while (*cmd && *str && *cmd == *str) {
2910 struct rdev_sysfs_entry {
2911 struct attribute attr;
2912 ssize_t (*show)(struct md_rdev *, char *);
2913 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2917 state_show(struct md_rdev *rdev, char *page)
2921 unsigned long flags = READ_ONCE(rdev->flags);
2923 if (test_bit(Faulty, &flags) ||
2924 (!test_bit(ExternalBbl, &flags) &&
2925 rdev->badblocks.unacked_exist))
2926 len += sprintf(page+len, "faulty%s", sep);
2927 if (test_bit(In_sync, &flags))
2928 len += sprintf(page+len, "in_sync%s", sep);
2929 if (test_bit(Journal, &flags))
2930 len += sprintf(page+len, "journal%s", sep);
2931 if (test_bit(WriteMostly, &flags))
2932 len += sprintf(page+len, "write_mostly%s", sep);
2933 if (test_bit(Blocked, &flags) ||
2934 (rdev->badblocks.unacked_exist
2935 && !test_bit(Faulty, &flags)))
2936 len += sprintf(page+len, "blocked%s", sep);
2937 if (!test_bit(Faulty, &flags) &&
2938 !test_bit(Journal, &flags) &&
2939 !test_bit(In_sync, &flags))
2940 len += sprintf(page+len, "spare%s", sep);
2941 if (test_bit(WriteErrorSeen, &flags))
2942 len += sprintf(page+len, "write_error%s", sep);
2943 if (test_bit(WantReplacement, &flags))
2944 len += sprintf(page+len, "want_replacement%s", sep);
2945 if (test_bit(Replacement, &flags))
2946 len += sprintf(page+len, "replacement%s", sep);
2947 if (test_bit(ExternalBbl, &flags))
2948 len += sprintf(page+len, "external_bbl%s", sep);
2949 if (test_bit(FailFast, &flags))
2950 len += sprintf(page+len, "failfast%s", sep);
2955 return len+sprintf(page+len, "\n");
2959 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2962 * faulty - simulates an error
2963 * remove - disconnects the device
2964 * writemostly - sets write_mostly
2965 * -writemostly - clears write_mostly
2966 * blocked - sets the Blocked flags
2967 * -blocked - clears the Blocked and possibly simulates an error
2968 * insync - sets Insync providing device isn't active
2969 * -insync - clear Insync for a device with a slot assigned,
2970 * so that it gets rebuilt based on bitmap
2971 * write_error - sets WriteErrorSeen
2972 * -write_error - clears WriteErrorSeen
2973 * {,-}failfast - set/clear FailFast
2976 struct mddev *mddev = rdev->mddev;
2978 bool need_update_sb = false;
2980 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2981 md_error(rdev->mddev, rdev);
2982 if (test_bit(Faulty, &rdev->flags))
2986 } else if (cmd_match(buf, "remove")) {
2987 if (rdev->mddev->pers) {
2988 clear_bit(Blocked, &rdev->flags);
2989 remove_and_add_spares(rdev->mddev, rdev);
2991 if (rdev->raid_disk >= 0)
2995 if (mddev_is_clustered(mddev))
2996 err = md_cluster_ops->remove_disk(mddev, rdev);
2999 md_kick_rdev_from_array(rdev);
3001 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3002 md_wakeup_thread(mddev->thread);
3007 } else if (cmd_match(buf, "writemostly")) {
3008 set_bit(WriteMostly, &rdev->flags);
3009 mddev_create_serial_pool(rdev->mddev, rdev, false);
3010 need_update_sb = true;
3012 } else if (cmd_match(buf, "-writemostly")) {
3013 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3014 clear_bit(WriteMostly, &rdev->flags);
3015 need_update_sb = true;
3017 } else if (cmd_match(buf, "blocked")) {
3018 set_bit(Blocked, &rdev->flags);
3020 } else if (cmd_match(buf, "-blocked")) {
3021 if (!test_bit(Faulty, &rdev->flags) &&
3022 !test_bit(ExternalBbl, &rdev->flags) &&
3023 rdev->badblocks.unacked_exist) {
3024 /* metadata handler doesn't understand badblocks,
3025 * so we need to fail the device
3027 md_error(rdev->mddev, rdev);
3029 clear_bit(Blocked, &rdev->flags);
3030 clear_bit(BlockedBadBlocks, &rdev->flags);
3031 wake_up(&rdev->blocked_wait);
3032 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3033 md_wakeup_thread(rdev->mddev->thread);
3036 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3037 set_bit(In_sync, &rdev->flags);
3039 } else if (cmd_match(buf, "failfast")) {
3040 set_bit(FailFast, &rdev->flags);
3041 need_update_sb = true;
3043 } else if (cmd_match(buf, "-failfast")) {
3044 clear_bit(FailFast, &rdev->flags);
3045 need_update_sb = true;
3047 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3048 !test_bit(Journal, &rdev->flags)) {
3049 if (rdev->mddev->pers == NULL) {
3050 clear_bit(In_sync, &rdev->flags);
3051 rdev->saved_raid_disk = rdev->raid_disk;
3052 rdev->raid_disk = -1;
3055 } else if (cmd_match(buf, "write_error")) {
3056 set_bit(WriteErrorSeen, &rdev->flags);
3058 } else if (cmd_match(buf, "-write_error")) {
3059 clear_bit(WriteErrorSeen, &rdev->flags);
3061 } else if (cmd_match(buf, "want_replacement")) {
3062 /* Any non-spare device that is not a replacement can
3063 * become want_replacement at any time, but we then need to
3064 * check if recovery is needed.
3066 if (rdev->raid_disk >= 0 &&
3067 !test_bit(Journal, &rdev->flags) &&
3068 !test_bit(Replacement, &rdev->flags))
3069 set_bit(WantReplacement, &rdev->flags);
3070 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3071 md_wakeup_thread(rdev->mddev->thread);
3073 } else if (cmd_match(buf, "-want_replacement")) {
3074 /* Clearing 'want_replacement' is always allowed.
3075 * Once replacements starts it is too late though.
3078 clear_bit(WantReplacement, &rdev->flags);
3079 } else if (cmd_match(buf, "replacement")) {
3080 /* Can only set a device as a replacement when array has not
3081 * yet been started. Once running, replacement is automatic
3082 * from spares, or by assigning 'slot'.
3084 if (rdev->mddev->pers)
3087 set_bit(Replacement, &rdev->flags);
3090 } else if (cmd_match(buf, "-replacement")) {
3091 /* Similarly, can only clear Replacement before start */
3092 if (rdev->mddev->pers)
3095 clear_bit(Replacement, &rdev->flags);
3098 } else if (cmd_match(buf, "re-add")) {
3099 if (!rdev->mddev->pers)
3101 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3102 rdev->saved_raid_disk >= 0) {
3103 /* clear_bit is performed _after_ all the devices
3104 * have their local Faulty bit cleared. If any writes
3105 * happen in the meantime in the local node, they
3106 * will land in the local bitmap, which will be synced
3107 * by this node eventually
3109 if (!mddev_is_clustered(rdev->mddev) ||
3110 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3111 clear_bit(Faulty, &rdev->flags);
3112 err = add_bound_rdev(rdev);
3116 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3117 set_bit(ExternalBbl, &rdev->flags);
3118 rdev->badblocks.shift = 0;
3120 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3121 clear_bit(ExternalBbl, &rdev->flags);
3125 md_update_sb(mddev, 1);
3127 sysfs_notify_dirent_safe(rdev->sysfs_state);
3128 return err ? err : len;
3130 static struct rdev_sysfs_entry rdev_state =
3131 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3134 errors_show(struct md_rdev *rdev, char *page)
3136 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3140 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3145 rv = kstrtouint(buf, 10, &n);
3148 atomic_set(&rdev->corrected_errors, n);
3151 static struct rdev_sysfs_entry rdev_errors =
3152 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3155 slot_show(struct md_rdev *rdev, char *page)
3157 if (test_bit(Journal, &rdev->flags))
3158 return sprintf(page, "journal\n");
3159 else if (rdev->raid_disk < 0)
3160 return sprintf(page, "none\n");
3162 return sprintf(page, "%d\n", rdev->raid_disk);
3166 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3171 if (test_bit(Journal, &rdev->flags))
3173 if (strncmp(buf, "none", 4)==0)
3176 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3180 if (rdev->mddev->pers && slot == -1) {
3181 /* Setting 'slot' on an active array requires also
3182 * updating the 'rd%d' link, and communicating
3183 * with the personality with ->hot_*_disk.
3184 * For now we only support removing
3185 * failed/spare devices. This normally happens automatically,
3186 * but not when the metadata is externally managed.
3188 if (rdev->raid_disk == -1)
3190 /* personality does all needed checks */
3191 if (rdev->mddev->pers->hot_remove_disk == NULL)
3193 clear_bit(Blocked, &rdev->flags);
3194 remove_and_add_spares(rdev->mddev, rdev);
3195 if (rdev->raid_disk >= 0)
3197 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3198 md_wakeup_thread(rdev->mddev->thread);
3199 } else if (rdev->mddev->pers) {
3200 /* Activating a spare .. or possibly reactivating
3201 * if we ever get bitmaps working here.
3205 if (rdev->raid_disk != -1)
3208 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3211 if (rdev->mddev->pers->hot_add_disk == NULL)
3214 if (slot >= rdev->mddev->raid_disks &&
3215 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3218 rdev->raid_disk = slot;
3219 if (test_bit(In_sync, &rdev->flags))
3220 rdev->saved_raid_disk = slot;
3222 rdev->saved_raid_disk = -1;
3223 clear_bit(In_sync, &rdev->flags);
3224 clear_bit(Bitmap_sync, &rdev->flags);
3225 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3227 rdev->raid_disk = -1;
3230 sysfs_notify_dirent_safe(rdev->sysfs_state);
3231 /* failure here is OK */;
3232 sysfs_link_rdev(rdev->mddev, rdev);
3233 /* don't wakeup anyone, leave that to userspace. */
3235 if (slot >= rdev->mddev->raid_disks &&
3236 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3238 rdev->raid_disk = slot;
3239 /* assume it is working */
3240 clear_bit(Faulty, &rdev->flags);
3241 clear_bit(WriteMostly, &rdev->flags);
3242 set_bit(In_sync, &rdev->flags);
3243 sysfs_notify_dirent_safe(rdev->sysfs_state);
3248 static struct rdev_sysfs_entry rdev_slot =
3249 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3252 offset_show(struct md_rdev *rdev, char *page)
3254 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3258 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3260 unsigned long long offset;
3261 if (kstrtoull(buf, 10, &offset) < 0)
3263 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3265 if (rdev->sectors && rdev->mddev->external)
3266 /* Must set offset before size, so overlap checks
3269 rdev->data_offset = offset;
3270 rdev->new_data_offset = offset;
3274 static struct rdev_sysfs_entry rdev_offset =
3275 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3277 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3279 return sprintf(page, "%llu\n",
3280 (unsigned long long)rdev->new_data_offset);
3283 static ssize_t new_offset_store(struct md_rdev *rdev,
3284 const char *buf, size_t len)
3286 unsigned long long new_offset;
3287 struct mddev *mddev = rdev->mddev;
3289 if (kstrtoull(buf, 10, &new_offset) < 0)
3292 if (mddev->sync_thread ||
3293 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3295 if (new_offset == rdev->data_offset)
3296 /* reset is always permitted */
3298 else if (new_offset > rdev->data_offset) {
3299 /* must not push array size beyond rdev_sectors */
3300 if (new_offset - rdev->data_offset
3301 + mddev->dev_sectors > rdev->sectors)
3304 /* Metadata worries about other space details. */
3306 /* decreasing the offset is inconsistent with a backwards
3309 if (new_offset < rdev->data_offset &&
3310 mddev->reshape_backwards)
3312 /* Increasing offset is inconsistent with forwards
3313 * reshape. reshape_direction should be set to
3314 * 'backwards' first.
3316 if (new_offset > rdev->data_offset &&
3317 !mddev->reshape_backwards)
3320 if (mddev->pers && mddev->persistent &&
3321 !super_types[mddev->major_version]
3322 .allow_new_offset(rdev, new_offset))
3324 rdev->new_data_offset = new_offset;
3325 if (new_offset > rdev->data_offset)
3326 mddev->reshape_backwards = 1;
3327 else if (new_offset < rdev->data_offset)
3328 mddev->reshape_backwards = 0;
3332 static struct rdev_sysfs_entry rdev_new_offset =
3333 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3336 rdev_size_show(struct md_rdev *rdev, char *page)
3338 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3341 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3343 /* check if two start/length pairs overlap */
3351 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3353 unsigned long long blocks;
3356 if (kstrtoull(buf, 10, &blocks) < 0)
3359 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3360 return -EINVAL; /* sector conversion overflow */
3363 if (new != blocks * 2)
3364 return -EINVAL; /* unsigned long long to sector_t overflow */
3371 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3373 struct mddev *my_mddev = rdev->mddev;
3374 sector_t oldsectors = rdev->sectors;
3377 if (test_bit(Journal, &rdev->flags))
3379 if (strict_blocks_to_sectors(buf, §ors) < 0)
3381 if (rdev->data_offset != rdev->new_data_offset)
3382 return -EINVAL; /* too confusing */
3383 if (my_mddev->pers && rdev->raid_disk >= 0) {
3384 if (my_mddev->persistent) {
3385 sectors = super_types[my_mddev->major_version].
3386 rdev_size_change(rdev, sectors);
3389 } else if (!sectors)
3390 sectors = bdev_nr_sectors(rdev->bdev) -
3392 if (!my_mddev->pers->resize)
3393 /* Cannot change size for RAID0 or Linear etc */
3396 if (sectors < my_mddev->dev_sectors)
3397 return -EINVAL; /* component must fit device */
3399 rdev->sectors = sectors;
3400 if (sectors > oldsectors && my_mddev->external) {
3401 /* Need to check that all other rdevs with the same
3402 * ->bdev do not overlap. 'rcu' is sufficient to walk
3403 * the rdev lists safely.
3404 * This check does not provide a hard guarantee, it
3405 * just helps avoid dangerous mistakes.
3407 struct mddev *mddev;
3409 struct list_head *tmp;
3412 for_each_mddev(mddev, tmp) {
3413 struct md_rdev *rdev2;
3415 rdev_for_each(rdev2, mddev)
3416 if (rdev->bdev == rdev2->bdev &&
3418 overlaps(rdev->data_offset, rdev->sectors,
3431 /* Someone else could have slipped in a size
3432 * change here, but doing so is just silly.
3433 * We put oldsectors back because we *know* it is
3434 * safe, and trust userspace not to race with
3437 rdev->sectors = oldsectors;
3444 static struct rdev_sysfs_entry rdev_size =
3445 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3447 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3449 unsigned long long recovery_start = rdev->recovery_offset;
3451 if (test_bit(In_sync, &rdev->flags) ||
3452 recovery_start == MaxSector)
3453 return sprintf(page, "none\n");
3455 return sprintf(page, "%llu\n", recovery_start);
3458 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3460 unsigned long long recovery_start;
3462 if (cmd_match(buf, "none"))
3463 recovery_start = MaxSector;
3464 else if (kstrtoull(buf, 10, &recovery_start))
3467 if (rdev->mddev->pers &&
3468 rdev->raid_disk >= 0)
3471 rdev->recovery_offset = recovery_start;
3472 if (recovery_start == MaxSector)
3473 set_bit(In_sync, &rdev->flags);
3475 clear_bit(In_sync, &rdev->flags);
3479 static struct rdev_sysfs_entry rdev_recovery_start =
3480 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3482 /* sysfs access to bad-blocks list.
3483 * We present two files.
3484 * 'bad-blocks' lists sector numbers and lengths of ranges that
3485 * are recorded as bad. The list is truncated to fit within
3486 * the one-page limit of sysfs.
3487 * Writing "sector length" to this file adds an acknowledged
3489 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3490 * been acknowledged. Writing to this file adds bad blocks
3491 * without acknowledging them. This is largely for testing.
3493 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3495 return badblocks_show(&rdev->badblocks, page, 0);
3497 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3499 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3500 /* Maybe that ack was all we needed */
3501 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3502 wake_up(&rdev->blocked_wait);
3505 static struct rdev_sysfs_entry rdev_bad_blocks =
3506 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3508 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3510 return badblocks_show(&rdev->badblocks, page, 1);
3512 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3514 return badblocks_store(&rdev->badblocks, page, len, 1);
3516 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3517 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3520 ppl_sector_show(struct md_rdev *rdev, char *page)
3522 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3526 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3528 unsigned long long sector;
3530 if (kstrtoull(buf, 10, §or) < 0)
3532 if (sector != (sector_t)sector)
3535 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3536 rdev->raid_disk >= 0)
3539 if (rdev->mddev->persistent) {
3540 if (rdev->mddev->major_version == 0)
3542 if ((sector > rdev->sb_start &&
3543 sector - rdev->sb_start > S16_MAX) ||
3544 (sector < rdev->sb_start &&
3545 rdev->sb_start - sector > -S16_MIN))
3547 rdev->ppl.offset = sector - rdev->sb_start;
3548 } else if (!rdev->mddev->external) {
3551 rdev->ppl.sector = sector;
3555 static struct rdev_sysfs_entry rdev_ppl_sector =
3556 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3559 ppl_size_show(struct md_rdev *rdev, char *page)
3561 return sprintf(page, "%u\n", rdev->ppl.size);
3565 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3569 if (kstrtouint(buf, 10, &size) < 0)
3572 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3573 rdev->raid_disk >= 0)
3576 if (rdev->mddev->persistent) {
3577 if (rdev->mddev->major_version == 0)
3581 } else if (!rdev->mddev->external) {
3584 rdev->ppl.size = size;
3588 static struct rdev_sysfs_entry rdev_ppl_size =
3589 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3591 static struct attribute *rdev_default_attrs[] = {
3596 &rdev_new_offset.attr,
3598 &rdev_recovery_start.attr,
3599 &rdev_bad_blocks.attr,
3600 &rdev_unack_bad_blocks.attr,
3601 &rdev_ppl_sector.attr,
3602 &rdev_ppl_size.attr,
3606 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3608 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3609 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3615 return entry->show(rdev, page);
3619 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3620 const char *page, size_t length)
3622 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3623 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3625 struct mddev *mddev = rdev->mddev;
3629 if (!capable(CAP_SYS_ADMIN))
3631 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3633 if (rdev->mddev == NULL)
3636 rv = entry->store(rdev, page, length);
3637 mddev_unlock(mddev);
3642 static void rdev_free(struct kobject *ko)
3644 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3647 static const struct sysfs_ops rdev_sysfs_ops = {
3648 .show = rdev_attr_show,
3649 .store = rdev_attr_store,
3651 static struct kobj_type rdev_ktype = {
3652 .release = rdev_free,
3653 .sysfs_ops = &rdev_sysfs_ops,
3654 .default_attrs = rdev_default_attrs,
3657 int md_rdev_init(struct md_rdev *rdev)
3660 rdev->saved_raid_disk = -1;
3661 rdev->raid_disk = -1;
3663 rdev->data_offset = 0;
3664 rdev->new_data_offset = 0;
3665 rdev->sb_events = 0;
3666 rdev->last_read_error = 0;
3667 rdev->sb_loaded = 0;
3668 rdev->bb_page = NULL;
3669 atomic_set(&rdev->nr_pending, 0);
3670 atomic_set(&rdev->read_errors, 0);
3671 atomic_set(&rdev->corrected_errors, 0);
3673 INIT_LIST_HEAD(&rdev->same_set);
3674 init_waitqueue_head(&rdev->blocked_wait);
3676 /* Add space to store bad block list.
3677 * This reserves the space even on arrays where it cannot
3678 * be used - I wonder if that matters
3680 return badblocks_init(&rdev->badblocks, 0);
3682 EXPORT_SYMBOL_GPL(md_rdev_init);
3684 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3686 * mark the device faulty if:
3688 * - the device is nonexistent (zero size)
3689 * - the device has no valid superblock
3691 * a faulty rdev _never_ has rdev->sb set.
3693 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3695 char b[BDEVNAME_SIZE];
3697 struct md_rdev *rdev;
3700 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3702 return ERR_PTR(-ENOMEM);
3704 err = md_rdev_init(rdev);
3707 err = alloc_disk_sb(rdev);
3711 err = lock_rdev(rdev, newdev, super_format == -2);
3715 kobject_init(&rdev->kobj, &rdev_ktype);
3717 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3719 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3720 bdevname(rdev->bdev,b));
3725 if (super_format >= 0) {
3726 err = super_types[super_format].
3727 load_super(rdev, NULL, super_minor);
3728 if (err == -EINVAL) {
3729 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3730 bdevname(rdev->bdev,b),
3731 super_format, super_minor);
3735 pr_warn("md: could not read %s's sb, not importing!\n",
3736 bdevname(rdev->bdev,b));
3746 md_rdev_clear(rdev);
3748 return ERR_PTR(err);
3752 * Check a full RAID array for plausibility
3755 static int analyze_sbs(struct mddev *mddev)
3758 struct md_rdev *rdev, *freshest, *tmp;
3759 char b[BDEVNAME_SIZE];
3762 rdev_for_each_safe(rdev, tmp, mddev)
3763 switch (super_types[mddev->major_version].
3764 load_super(rdev, freshest, mddev->minor_version)) {
3771 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3772 bdevname(rdev->bdev,b));
3773 md_kick_rdev_from_array(rdev);
3776 /* Cannot find a valid fresh disk */
3778 pr_warn("md: cannot find a valid disk\n");
3782 super_types[mddev->major_version].
3783 validate_super(mddev, freshest);
3786 rdev_for_each_safe(rdev, tmp, mddev) {
3787 if (mddev->max_disks &&
3788 (rdev->desc_nr >= mddev->max_disks ||
3789 i > mddev->max_disks)) {
3790 pr_warn("md: %s: %s: only %d devices permitted\n",
3791 mdname(mddev), bdevname(rdev->bdev, b),
3793 md_kick_rdev_from_array(rdev);
3796 if (rdev != freshest) {
3797 if (super_types[mddev->major_version].
3798 validate_super(mddev, rdev)) {
3799 pr_warn("md: kicking non-fresh %s from array!\n",
3800 bdevname(rdev->bdev,b));
3801 md_kick_rdev_from_array(rdev);
3805 if (mddev->level == LEVEL_MULTIPATH) {
3806 rdev->desc_nr = i++;
3807 rdev->raid_disk = rdev->desc_nr;
3808 set_bit(In_sync, &rdev->flags);
3809 } else if (rdev->raid_disk >=
3810 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3811 !test_bit(Journal, &rdev->flags)) {
3812 rdev->raid_disk = -1;
3813 clear_bit(In_sync, &rdev->flags);
3820 /* Read a fixed-point number.
3821 * Numbers in sysfs attributes should be in "standard" units where
3822 * possible, so time should be in seconds.
3823 * However we internally use a a much smaller unit such as
3824 * milliseconds or jiffies.
3825 * This function takes a decimal number with a possible fractional
3826 * component, and produces an integer which is the result of
3827 * multiplying that number by 10^'scale'.
3828 * all without any floating-point arithmetic.
3830 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3832 unsigned long result = 0;
3834 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3837 else if (decimals < scale) {
3840 result = result * 10 + value;
3852 *res = result * int_pow(10, scale - decimals);
3857 safe_delay_show(struct mddev *mddev, char *page)
3859 int msec = (mddev->safemode_delay*1000)/HZ;
3860 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3863 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3867 if (mddev_is_clustered(mddev)) {
3868 pr_warn("md: Safemode is disabled for clustered mode\n");
3872 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3875 mddev->safemode_delay = 0;
3877 unsigned long old_delay = mddev->safemode_delay;
3878 unsigned long new_delay = (msec*HZ)/1000;
3882 mddev->safemode_delay = new_delay;
3883 if (new_delay < old_delay || old_delay == 0)
3884 mod_timer(&mddev->safemode_timer, jiffies+1);
3888 static struct md_sysfs_entry md_safe_delay =
3889 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3892 level_show(struct mddev *mddev, char *page)
3894 struct md_personality *p;
3896 spin_lock(&mddev->lock);
3899 ret = sprintf(page, "%s\n", p->name);
3900 else if (mddev->clevel[0])
3901 ret = sprintf(page, "%s\n", mddev->clevel);
3902 else if (mddev->level != LEVEL_NONE)
3903 ret = sprintf(page, "%d\n", mddev->level);
3906 spin_unlock(&mddev->lock);
3911 level_store(struct mddev *mddev, const char *buf, size_t len)
3916 struct md_personality *pers, *oldpers;
3918 void *priv, *oldpriv;
3919 struct md_rdev *rdev;
3921 if (slen == 0 || slen >= sizeof(clevel))
3924 rv = mddev_lock(mddev);
3928 if (mddev->pers == NULL) {
3929 strncpy(mddev->clevel, buf, slen);
3930 if (mddev->clevel[slen-1] == '\n')
3932 mddev->clevel[slen] = 0;
3933 mddev->level = LEVEL_NONE;
3941 /* request to change the personality. Need to ensure:
3942 * - array is not engaged in resync/recovery/reshape
3943 * - old personality can be suspended
3944 * - new personality will access other array.
3948 if (mddev->sync_thread ||
3949 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3950 mddev->reshape_position != MaxSector ||
3951 mddev->sysfs_active)
3955 if (!mddev->pers->quiesce) {
3956 pr_warn("md: %s: %s does not support online personality change\n",
3957 mdname(mddev), mddev->pers->name);
3961 /* Now find the new personality */
3962 strncpy(clevel, buf, slen);
3963 if (clevel[slen-1] == '\n')
3966 if (kstrtol(clevel, 10, &level))
3969 if (request_module("md-%s", clevel) != 0)
3970 request_module("md-level-%s", clevel);
3971 spin_lock(&pers_lock);
3972 pers = find_pers(level, clevel);
3973 if (!pers || !try_module_get(pers->owner)) {
3974 spin_unlock(&pers_lock);
3975 pr_warn("md: personality %s not loaded\n", clevel);
3979 spin_unlock(&pers_lock);
3981 if (pers == mddev->pers) {
3982 /* Nothing to do! */
3983 module_put(pers->owner);
3987 if (!pers->takeover) {
3988 module_put(pers->owner);
3989 pr_warn("md: %s: %s does not support personality takeover\n",
3990 mdname(mddev), clevel);
3995 rdev_for_each(rdev, mddev)
3996 rdev->new_raid_disk = rdev->raid_disk;
3998 /* ->takeover must set new_* and/or delta_disks
3999 * if it succeeds, and may set them when it fails.
4001 priv = pers->takeover(mddev);
4003 mddev->new_level = mddev->level;
4004 mddev->new_layout = mddev->layout;
4005 mddev->new_chunk_sectors = mddev->chunk_sectors;
4006 mddev->raid_disks -= mddev->delta_disks;
4007 mddev->delta_disks = 0;
4008 mddev->reshape_backwards = 0;
4009 module_put(pers->owner);
4010 pr_warn("md: %s: %s would not accept array\n",
4011 mdname(mddev), clevel);
4016 /* Looks like we have a winner */
4017 mddev_suspend(mddev);
4018 mddev_detach(mddev);
4020 spin_lock(&mddev->lock);
4021 oldpers = mddev->pers;
4022 oldpriv = mddev->private;
4024 mddev->private = priv;
4025 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4026 mddev->level = mddev->new_level;
4027 mddev->layout = mddev->new_layout;
4028 mddev->chunk_sectors = mddev->new_chunk_sectors;
4029 mddev->delta_disks = 0;
4030 mddev->reshape_backwards = 0;
4031 mddev->degraded = 0;
4032 spin_unlock(&mddev->lock);
4034 if (oldpers->sync_request == NULL &&
4036 /* We are converting from a no-redundancy array
4037 * to a redundancy array and metadata is managed
4038 * externally so we need to be sure that writes
4039 * won't block due to a need to transition
4041 * until external management is started.
4044 mddev->safemode_delay = 0;
4045 mddev->safemode = 0;
4048 oldpers->free(mddev, oldpriv);
4050 if (oldpers->sync_request == NULL &&
4051 pers->sync_request != NULL) {
4052 /* need to add the md_redundancy_group */
4053 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4054 pr_warn("md: cannot register extra attributes for %s\n",
4056 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4057 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4058 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4060 if (oldpers->sync_request != NULL &&
4061 pers->sync_request == NULL) {
4062 /* need to remove the md_redundancy_group */
4063 if (mddev->to_remove == NULL)
4064 mddev->to_remove = &md_redundancy_group;
4067 module_put(oldpers->owner);
4069 rdev_for_each(rdev, mddev) {
4070 if (rdev->raid_disk < 0)
4072 if (rdev->new_raid_disk >= mddev->raid_disks)
4073 rdev->new_raid_disk = -1;
4074 if (rdev->new_raid_disk == rdev->raid_disk)
4076 sysfs_unlink_rdev(mddev, rdev);
4078 rdev_for_each(rdev, mddev) {
4079 if (rdev->raid_disk < 0)
4081 if (rdev->new_raid_disk == rdev->raid_disk)
4083 rdev->raid_disk = rdev->new_raid_disk;
4084 if (rdev->raid_disk < 0)
4085 clear_bit(In_sync, &rdev->flags);
4087 if (sysfs_link_rdev(mddev, rdev))
4088 pr_warn("md: cannot register rd%d for %s after level change\n",
4089 rdev->raid_disk, mdname(mddev));
4093 if (pers->sync_request == NULL) {
4094 /* this is now an array without redundancy, so
4095 * it must always be in_sync
4098 del_timer_sync(&mddev->safemode_timer);
4100 blk_set_stacking_limits(&mddev->queue->limits);
4102 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4103 mddev_resume(mddev);
4105 md_update_sb(mddev, 1);
4106 sysfs_notify_dirent_safe(mddev->sysfs_level);
4110 mddev_unlock(mddev);
4114 static struct md_sysfs_entry md_level =
4115 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4118 layout_show(struct mddev *mddev, char *page)
4120 /* just a number, not meaningful for all levels */
4121 if (mddev->reshape_position != MaxSector &&
4122 mddev->layout != mddev->new_layout)
4123 return sprintf(page, "%d (%d)\n",
4124 mddev->new_layout, mddev->layout);
4125 return sprintf(page, "%d\n", mddev->layout);
4129 layout_store(struct mddev *mddev, const char *buf, size_t len)
4134 err = kstrtouint(buf, 10, &n);
4137 err = mddev_lock(mddev);
4142 if (mddev->pers->check_reshape == NULL)
4147 mddev->new_layout = n;
4148 err = mddev->pers->check_reshape(mddev);
4150 mddev->new_layout = mddev->layout;
4153 mddev->new_layout = n;
4154 if (mddev->reshape_position == MaxSector)
4157 mddev_unlock(mddev);
4160 static struct md_sysfs_entry md_layout =
4161 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4164 raid_disks_show(struct mddev *mddev, char *page)
4166 if (mddev->raid_disks == 0)
4168 if (mddev->reshape_position != MaxSector &&
4169 mddev->delta_disks != 0)
4170 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4171 mddev->raid_disks - mddev->delta_disks);
4172 return sprintf(page, "%d\n", mddev->raid_disks);
4175 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4178 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4183 err = kstrtouint(buf, 10, &n);
4187 err = mddev_lock(mddev);
4191 err = update_raid_disks(mddev, n);
4192 else if (mddev->reshape_position != MaxSector) {
4193 struct md_rdev *rdev;
4194 int olddisks = mddev->raid_disks - mddev->delta_disks;
4197 rdev_for_each(rdev, mddev) {
4199 rdev->data_offset < rdev->new_data_offset)
4202 rdev->data_offset > rdev->new_data_offset)
4206 mddev->delta_disks = n - olddisks;
4207 mddev->raid_disks = n;
4208 mddev->reshape_backwards = (mddev->delta_disks < 0);
4210 mddev->raid_disks = n;
4212 mddev_unlock(mddev);
4213 return err ? err : len;
4215 static struct md_sysfs_entry md_raid_disks =
4216 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4219 uuid_show(struct mddev *mddev, char *page)
4221 return sprintf(page, "%pU\n", mddev->uuid);
4223 static struct md_sysfs_entry md_uuid =
4224 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4227 chunk_size_show(struct mddev *mddev, char *page)
4229 if (mddev->reshape_position != MaxSector &&
4230 mddev->chunk_sectors != mddev->new_chunk_sectors)
4231 return sprintf(page, "%d (%d)\n",
4232 mddev->new_chunk_sectors << 9,
4233 mddev->chunk_sectors << 9);
4234 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4238 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4243 err = kstrtoul(buf, 10, &n);
4247 err = mddev_lock(mddev);
4251 if (mddev->pers->check_reshape == NULL)
4256 mddev->new_chunk_sectors = n >> 9;
4257 err = mddev->pers->check_reshape(mddev);
4259 mddev->new_chunk_sectors = mddev->chunk_sectors;
4262 mddev->new_chunk_sectors = n >> 9;
4263 if (mddev->reshape_position == MaxSector)
4264 mddev->chunk_sectors = n >> 9;
4266 mddev_unlock(mddev);
4269 static struct md_sysfs_entry md_chunk_size =
4270 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4273 resync_start_show(struct mddev *mddev, char *page)
4275 if (mddev->recovery_cp == MaxSector)
4276 return sprintf(page, "none\n");
4277 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4281 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4283 unsigned long long n;
4286 if (cmd_match(buf, "none"))
4289 err = kstrtoull(buf, 10, &n);
4292 if (n != (sector_t)n)
4296 err = mddev_lock(mddev);
4299 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4303 mddev->recovery_cp = n;
4305 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4307 mddev_unlock(mddev);
4310 static struct md_sysfs_entry md_resync_start =
4311 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4312 resync_start_show, resync_start_store);
4315 * The array state can be:
4318 * No devices, no size, no level
4319 * Equivalent to STOP_ARRAY ioctl
4321 * May have some settings, but array is not active
4322 * all IO results in error
4323 * When written, doesn't tear down array, but just stops it
4324 * suspended (not supported yet)
4325 * All IO requests will block. The array can be reconfigured.
4326 * Writing this, if accepted, will block until array is quiescent
4328 * no resync can happen. no superblocks get written.
4329 * write requests fail
4331 * like readonly, but behaves like 'clean' on a write request.
4333 * clean - no pending writes, but otherwise active.
4334 * When written to inactive array, starts without resync
4335 * If a write request arrives then
4336 * if metadata is known, mark 'dirty' and switch to 'active'.
4337 * if not known, block and switch to write-pending
4338 * If written to an active array that has pending writes, then fails.
4340 * fully active: IO and resync can be happening.
4341 * When written to inactive array, starts with resync
4344 * clean, but writes are blocked waiting for 'active' to be written.
4347 * like active, but no writes have been seen for a while (100msec).
4350 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4351 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4352 * when a member is gone, so this state will at least alert the
4353 * user that something is wrong.
4355 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4356 write_pending, active_idle, broken, bad_word};
4357 static char *array_states[] = {
4358 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4359 "write-pending", "active-idle", "broken", NULL };
4361 static int match_word(const char *word, char **list)
4364 for (n=0; list[n]; n++)
4365 if (cmd_match(word, list[n]))
4371 array_state_show(struct mddev *mddev, char *page)
4373 enum array_state st = inactive;
4375 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4384 spin_lock(&mddev->lock);
4385 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4387 else if (mddev->in_sync)
4389 else if (mddev->safemode)
4393 spin_unlock(&mddev->lock);
4396 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4399 if (list_empty(&mddev->disks) &&
4400 mddev->raid_disks == 0 &&
4401 mddev->dev_sectors == 0)
4406 return sprintf(page, "%s\n", array_states[st]);
4409 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4410 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4411 static int restart_array(struct mddev *mddev);
4414 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4417 enum array_state st = match_word(buf, array_states);
4419 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4420 /* don't take reconfig_mutex when toggling between
4423 spin_lock(&mddev->lock);
4425 restart_array(mddev);
4426 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4427 md_wakeup_thread(mddev->thread);
4428 wake_up(&mddev->sb_wait);
4429 } else /* st == clean */ {
4430 restart_array(mddev);
4431 if (!set_in_sync(mddev))
4435 sysfs_notify_dirent_safe(mddev->sysfs_state);
4436 spin_unlock(&mddev->lock);
4439 err = mddev_lock(mddev);
4447 /* stopping an active array */
4448 err = do_md_stop(mddev, 0, NULL);
4451 /* stopping an active array */
4453 err = do_md_stop(mddev, 2, NULL);
4455 err = 0; /* already inactive */
4458 break; /* not supported yet */
4461 err = md_set_readonly(mddev, NULL);
4464 set_disk_ro(mddev->gendisk, 1);
4465 err = do_md_run(mddev);
4471 err = md_set_readonly(mddev, NULL);
4472 else if (mddev->ro == 1)
4473 err = restart_array(mddev);
4476 set_disk_ro(mddev->gendisk, 0);
4480 err = do_md_run(mddev);
4485 err = restart_array(mddev);
4488 spin_lock(&mddev->lock);
4489 if (!set_in_sync(mddev))
4491 spin_unlock(&mddev->lock);
4497 err = restart_array(mddev);
4500 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4501 wake_up(&mddev->sb_wait);
4505 set_disk_ro(mddev->gendisk, 0);
4506 err = do_md_run(mddev);
4512 /* these cannot be set */
4517 if (mddev->hold_active == UNTIL_IOCTL)
4518 mddev->hold_active = 0;
4519 sysfs_notify_dirent_safe(mddev->sysfs_state);
4521 mddev_unlock(mddev);
4524 static struct md_sysfs_entry md_array_state =
4525 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4528 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4529 return sprintf(page, "%d\n",
4530 atomic_read(&mddev->max_corr_read_errors));
4534 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4539 rv = kstrtouint(buf, 10, &n);
4542 atomic_set(&mddev->max_corr_read_errors, n);
4546 static struct md_sysfs_entry max_corr_read_errors =
4547 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4548 max_corrected_read_errors_store);
4551 null_show(struct mddev *mddev, char *page)
4556 /* need to ensure rdev_delayed_delete() has completed */
4557 static void flush_rdev_wq(struct mddev *mddev)
4559 struct md_rdev *rdev;
4562 rdev_for_each_rcu(rdev, mddev)
4563 if (work_pending(&rdev->del_work)) {
4564 flush_workqueue(md_rdev_misc_wq);
4571 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4573 /* buf must be %d:%d\n? giving major and minor numbers */
4574 /* The new device is added to the array.
4575 * If the array has a persistent superblock, we read the
4576 * superblock to initialise info and check validity.
4577 * Otherwise, only checking done is that in bind_rdev_to_array,
4578 * which mainly checks size.
4581 int major = simple_strtoul(buf, &e, 10);
4584 struct md_rdev *rdev;
4587 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4589 minor = simple_strtoul(e+1, &e, 10);
4590 if (*e && *e != '\n')
4592 dev = MKDEV(major, minor);
4593 if (major != MAJOR(dev) ||
4594 minor != MINOR(dev))
4597 flush_rdev_wq(mddev);
4598 err = mddev_lock(mddev);
4601 if (mddev->persistent) {
4602 rdev = md_import_device(dev, mddev->major_version,
4603 mddev->minor_version);
4604 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4605 struct md_rdev *rdev0
4606 = list_entry(mddev->disks.next,
4607 struct md_rdev, same_set);
4608 err = super_types[mddev->major_version]
4609 .load_super(rdev, rdev0, mddev->minor_version);
4613 } else if (mddev->external)
4614 rdev = md_import_device(dev, -2, -1);
4616 rdev = md_import_device(dev, -1, -1);
4619 mddev_unlock(mddev);
4620 return PTR_ERR(rdev);
4622 err = bind_rdev_to_array(rdev, mddev);
4626 mddev_unlock(mddev);
4629 return err ? err : len;
4632 static struct md_sysfs_entry md_new_device =
4633 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4636 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4639 unsigned long chunk, end_chunk;
4642 err = mddev_lock(mddev);
4647 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4649 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4650 if (buf == end) break;
4651 if (*end == '-') { /* range */
4653 end_chunk = simple_strtoul(buf, &end, 0);
4654 if (buf == end) break;
4656 if (*end && !isspace(*end)) break;
4657 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4658 buf = skip_spaces(end);
4660 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4662 mddev_unlock(mddev);
4666 static struct md_sysfs_entry md_bitmap =
4667 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4670 size_show(struct mddev *mddev, char *page)
4672 return sprintf(page, "%llu\n",
4673 (unsigned long long)mddev->dev_sectors / 2);
4676 static int update_size(struct mddev *mddev, sector_t num_sectors);
4679 size_store(struct mddev *mddev, const char *buf, size_t len)
4681 /* If array is inactive, we can reduce the component size, but
4682 * not increase it (except from 0).
4683 * If array is active, we can try an on-line resize
4686 int err = strict_blocks_to_sectors(buf, §ors);
4690 err = mddev_lock(mddev);
4694 err = update_size(mddev, sectors);
4696 md_update_sb(mddev, 1);
4698 if (mddev->dev_sectors == 0 ||
4699 mddev->dev_sectors > sectors)
4700 mddev->dev_sectors = sectors;
4704 mddev_unlock(mddev);
4705 return err ? err : len;
4708 static struct md_sysfs_entry md_size =
4709 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4711 /* Metadata version.
4713 * 'none' for arrays with no metadata (good luck...)
4714 * 'external' for arrays with externally managed metadata,
4715 * or N.M for internally known formats
4718 metadata_show(struct mddev *mddev, char *page)
4720 if (mddev->persistent)
4721 return sprintf(page, "%d.%d\n",
4722 mddev->major_version, mddev->minor_version);
4723 else if (mddev->external)
4724 return sprintf(page, "external:%s\n", mddev->metadata_type);
4726 return sprintf(page, "none\n");
4730 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4735 /* Changing the details of 'external' metadata is
4736 * always permitted. Otherwise there must be
4737 * no devices attached to the array.
4740 err = mddev_lock(mddev);
4744 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4746 else if (!list_empty(&mddev->disks))
4750 if (cmd_match(buf, "none")) {
4751 mddev->persistent = 0;
4752 mddev->external = 0;
4753 mddev->major_version = 0;
4754 mddev->minor_version = 90;
4757 if (strncmp(buf, "external:", 9) == 0) {
4758 size_t namelen = len-9;
4759 if (namelen >= sizeof(mddev->metadata_type))
4760 namelen = sizeof(mddev->metadata_type)-1;
4761 strncpy(mddev->metadata_type, buf+9, namelen);
4762 mddev->metadata_type[namelen] = 0;
4763 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4764 mddev->metadata_type[--namelen] = 0;
4765 mddev->persistent = 0;
4766 mddev->external = 1;
4767 mddev->major_version = 0;
4768 mddev->minor_version = 90;
4771 major = simple_strtoul(buf, &e, 10);
4773 if (e==buf || *e != '.')
4776 minor = simple_strtoul(buf, &e, 10);
4777 if (e==buf || (*e && *e != '\n') )
4780 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4782 mddev->major_version = major;
4783 mddev->minor_version = minor;
4784 mddev->persistent = 1;
4785 mddev->external = 0;
4788 mddev_unlock(mddev);
4792 static struct md_sysfs_entry md_metadata =
4793 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4796 action_show(struct mddev *mddev, char *page)
4798 char *type = "idle";
4799 unsigned long recovery = mddev->recovery;
4800 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4802 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4803 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4804 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4806 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4807 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4809 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4813 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4815 else if (mddev->reshape_position != MaxSector)
4818 return sprintf(page, "%s\n", type);
4822 action_store(struct mddev *mddev, const char *page, size_t len)
4824 if (!mddev->pers || !mddev->pers->sync_request)
4828 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4829 if (cmd_match(page, "frozen"))
4830 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4832 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4833 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4834 mddev_lock(mddev) == 0) {
4835 if (work_pending(&mddev->del_work))
4836 flush_workqueue(md_misc_wq);
4837 if (mddev->sync_thread) {
4838 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4839 md_reap_sync_thread(mddev);
4841 mddev_unlock(mddev);
4843 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4845 else if (cmd_match(page, "resync"))
4846 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4847 else if (cmd_match(page, "recover")) {
4848 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4849 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4850 } else if (cmd_match(page, "reshape")) {
4852 if (mddev->pers->start_reshape == NULL)
4854 err = mddev_lock(mddev);
4856 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4859 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4860 err = mddev->pers->start_reshape(mddev);
4862 mddev_unlock(mddev);
4866 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4868 if (cmd_match(page, "check"))
4869 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4870 else if (!cmd_match(page, "repair"))
4872 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4873 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4874 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4876 if (mddev->ro == 2) {
4877 /* A write to sync_action is enough to justify
4878 * canceling read-auto mode
4881 md_wakeup_thread(mddev->sync_thread);
4883 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4884 md_wakeup_thread(mddev->thread);
4885 sysfs_notify_dirent_safe(mddev->sysfs_action);
4889 static struct md_sysfs_entry md_scan_mode =
4890 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4893 last_sync_action_show(struct mddev *mddev, char *page)
4895 return sprintf(page, "%s\n", mddev->last_sync_action);
4898 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4901 mismatch_cnt_show(struct mddev *mddev, char *page)
4903 return sprintf(page, "%llu\n",
4904 (unsigned long long)
4905 atomic64_read(&mddev->resync_mismatches));
4908 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4911 sync_min_show(struct mddev *mddev, char *page)
4913 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4914 mddev->sync_speed_min ? "local": "system");
4918 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4923 if (strncmp(buf, "system", 6)==0) {
4926 rv = kstrtouint(buf, 10, &min);
4932 mddev->sync_speed_min = min;
4936 static struct md_sysfs_entry md_sync_min =
4937 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4940 sync_max_show(struct mddev *mddev, char *page)
4942 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4943 mddev->sync_speed_max ? "local": "system");
4947 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4952 if (strncmp(buf, "system", 6)==0) {
4955 rv = kstrtouint(buf, 10, &max);
4961 mddev->sync_speed_max = max;
4965 static struct md_sysfs_entry md_sync_max =
4966 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4969 degraded_show(struct mddev *mddev, char *page)
4971 return sprintf(page, "%d\n", mddev->degraded);
4973 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4976 sync_force_parallel_show(struct mddev *mddev, char *page)
4978 return sprintf(page, "%d\n", mddev->parallel_resync);
4982 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4986 if (kstrtol(buf, 10, &n))
4989 if (n != 0 && n != 1)
4992 mddev->parallel_resync = n;
4994 if (mddev->sync_thread)
4995 wake_up(&resync_wait);
5000 /* force parallel resync, even with shared block devices */
5001 static struct md_sysfs_entry md_sync_force_parallel =
5002 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5003 sync_force_parallel_show, sync_force_parallel_store);
5006 sync_speed_show(struct mddev *mddev, char *page)
5008 unsigned long resync, dt, db;
5009 if (mddev->curr_resync == 0)
5010 return sprintf(page, "none\n");
5011 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5012 dt = (jiffies - mddev->resync_mark) / HZ;
5014 db = resync - mddev->resync_mark_cnt;
5015 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5018 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5021 sync_completed_show(struct mddev *mddev, char *page)
5023 unsigned long long max_sectors, resync;
5025 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5026 return sprintf(page, "none\n");
5028 if (mddev->curr_resync == 1 ||
5029 mddev->curr_resync == 2)
5030 return sprintf(page, "delayed\n");
5032 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5033 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5034 max_sectors = mddev->resync_max_sectors;
5036 max_sectors = mddev->dev_sectors;
5038 resync = mddev->curr_resync_completed;
5039 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5042 static struct md_sysfs_entry md_sync_completed =
5043 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5046 min_sync_show(struct mddev *mddev, char *page)
5048 return sprintf(page, "%llu\n",
5049 (unsigned long long)mddev->resync_min);
5052 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5054 unsigned long long min;
5057 if (kstrtoull(buf, 10, &min))
5060 spin_lock(&mddev->lock);
5062 if (min > mddev->resync_max)
5066 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5069 /* Round down to multiple of 4K for safety */
5070 mddev->resync_min = round_down(min, 8);
5074 spin_unlock(&mddev->lock);
5078 static struct md_sysfs_entry md_min_sync =
5079 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5082 max_sync_show(struct mddev *mddev, char *page)
5084 if (mddev->resync_max == MaxSector)
5085 return sprintf(page, "max\n");
5087 return sprintf(page, "%llu\n",
5088 (unsigned long long)mddev->resync_max);
5091 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5094 spin_lock(&mddev->lock);
5095 if (strncmp(buf, "max", 3) == 0)
5096 mddev->resync_max = MaxSector;
5098 unsigned long long max;
5102 if (kstrtoull(buf, 10, &max))
5104 if (max < mddev->resync_min)
5108 if (max < mddev->resync_max &&
5110 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5113 /* Must be a multiple of chunk_size */
5114 chunk = mddev->chunk_sectors;
5116 sector_t temp = max;
5119 if (sector_div(temp, chunk))
5122 mddev->resync_max = max;
5124 wake_up(&mddev->recovery_wait);
5127 spin_unlock(&mddev->lock);
5131 static struct md_sysfs_entry md_max_sync =
5132 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5135 suspend_lo_show(struct mddev *mddev, char *page)
5137 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5141 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5143 unsigned long long new;
5146 err = kstrtoull(buf, 10, &new);
5149 if (new != (sector_t)new)
5152 err = mddev_lock(mddev);
5156 if (mddev->pers == NULL ||
5157 mddev->pers->quiesce == NULL)
5159 mddev_suspend(mddev);
5160 mddev->suspend_lo = new;
5161 mddev_resume(mddev);
5165 mddev_unlock(mddev);
5168 static struct md_sysfs_entry md_suspend_lo =
5169 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5172 suspend_hi_show(struct mddev *mddev, char *page)
5174 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5178 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5180 unsigned long long new;
5183 err = kstrtoull(buf, 10, &new);
5186 if (new != (sector_t)new)
5189 err = mddev_lock(mddev);
5193 if (mddev->pers == NULL)
5196 mddev_suspend(mddev);
5197 mddev->suspend_hi = new;
5198 mddev_resume(mddev);
5202 mddev_unlock(mddev);
5205 static struct md_sysfs_entry md_suspend_hi =
5206 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5209 reshape_position_show(struct mddev *mddev, char *page)
5211 if (mddev->reshape_position != MaxSector)
5212 return sprintf(page, "%llu\n",
5213 (unsigned long long)mddev->reshape_position);
5214 strcpy(page, "none\n");
5219 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5221 struct md_rdev *rdev;
5222 unsigned long long new;
5225 err = kstrtoull(buf, 10, &new);
5228 if (new != (sector_t)new)
5230 err = mddev_lock(mddev);
5236 mddev->reshape_position = new;
5237 mddev->delta_disks = 0;
5238 mddev->reshape_backwards = 0;
5239 mddev->new_level = mddev->level;
5240 mddev->new_layout = mddev->layout;
5241 mddev->new_chunk_sectors = mddev->chunk_sectors;
5242 rdev_for_each(rdev, mddev)
5243 rdev->new_data_offset = rdev->data_offset;
5246 mddev_unlock(mddev);
5250 static struct md_sysfs_entry md_reshape_position =
5251 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5252 reshape_position_store);
5255 reshape_direction_show(struct mddev *mddev, char *page)
5257 return sprintf(page, "%s\n",
5258 mddev->reshape_backwards ? "backwards" : "forwards");
5262 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5267 if (cmd_match(buf, "forwards"))
5269 else if (cmd_match(buf, "backwards"))
5273 if (mddev->reshape_backwards == backwards)
5276 err = mddev_lock(mddev);
5279 /* check if we are allowed to change */
5280 if (mddev->delta_disks)
5282 else if (mddev->persistent &&
5283 mddev->major_version == 0)
5286 mddev->reshape_backwards = backwards;
5287 mddev_unlock(mddev);
5291 static struct md_sysfs_entry md_reshape_direction =
5292 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5293 reshape_direction_store);
5296 array_size_show(struct mddev *mddev, char *page)
5298 if (mddev->external_size)
5299 return sprintf(page, "%llu\n",
5300 (unsigned long long)mddev->array_sectors/2);
5302 return sprintf(page, "default\n");
5306 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5311 err = mddev_lock(mddev);
5315 /* cluster raid doesn't support change array_sectors */
5316 if (mddev_is_clustered(mddev)) {
5317 mddev_unlock(mddev);
5321 if (strncmp(buf, "default", 7) == 0) {
5323 sectors = mddev->pers->size(mddev, 0, 0);
5325 sectors = mddev->array_sectors;
5327 mddev->external_size = 0;
5329 if (strict_blocks_to_sectors(buf, §ors) < 0)
5331 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5334 mddev->external_size = 1;
5338 mddev->array_sectors = sectors;
5340 set_capacity_and_notify(mddev->gendisk,
5341 mddev->array_sectors);
5343 mddev_unlock(mddev);
5347 static struct md_sysfs_entry md_array_size =
5348 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5352 consistency_policy_show(struct mddev *mddev, char *page)
5356 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5357 ret = sprintf(page, "journal\n");
5358 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5359 ret = sprintf(page, "ppl\n");
5360 } else if (mddev->bitmap) {
5361 ret = sprintf(page, "bitmap\n");
5362 } else if (mddev->pers) {
5363 if (mddev->pers->sync_request)
5364 ret = sprintf(page, "resync\n");
5366 ret = sprintf(page, "none\n");
5368 ret = sprintf(page, "unknown\n");
5375 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5380 if (mddev->pers->change_consistency_policy)
5381 err = mddev->pers->change_consistency_policy(mddev, buf);
5384 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5385 set_bit(MD_HAS_PPL, &mddev->flags);
5390 return err ? err : len;
5393 static struct md_sysfs_entry md_consistency_policy =
5394 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5395 consistency_policy_store);
5397 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5399 return sprintf(page, "%d\n", mddev->fail_last_dev);
5403 * Setting fail_last_dev to true to allow last device to be forcibly removed
5404 * from RAID1/RAID10.
5407 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5412 ret = kstrtobool(buf, &value);
5416 if (value != mddev->fail_last_dev)
5417 mddev->fail_last_dev = value;
5421 static struct md_sysfs_entry md_fail_last_dev =
5422 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5423 fail_last_dev_store);
5425 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5427 if (mddev->pers == NULL || (mddev->pers->level != 1))
5428 return sprintf(page, "n/a\n");
5430 return sprintf(page, "%d\n", mddev->serialize_policy);
5434 * Setting serialize_policy to true to enforce write IO is not reordered
5438 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5443 err = kstrtobool(buf, &value);
5447 if (value == mddev->serialize_policy)
5450 err = mddev_lock(mddev);
5453 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5454 pr_err("md: serialize_policy is only effective for raid1\n");
5459 mddev_suspend(mddev);
5461 mddev_create_serial_pool(mddev, NULL, true);
5463 mddev_destroy_serial_pool(mddev, NULL, true);
5464 mddev->serialize_policy = value;
5465 mddev_resume(mddev);
5467 mddev_unlock(mddev);
5471 static struct md_sysfs_entry md_serialize_policy =
5472 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5473 serialize_policy_store);
5476 static struct attribute *md_default_attrs[] = {
5479 &md_raid_disks.attr,
5481 &md_chunk_size.attr,
5483 &md_resync_start.attr,
5485 &md_new_device.attr,
5486 &md_safe_delay.attr,
5487 &md_array_state.attr,
5488 &md_reshape_position.attr,
5489 &md_reshape_direction.attr,
5490 &md_array_size.attr,
5491 &max_corr_read_errors.attr,
5492 &md_consistency_policy.attr,
5493 &md_fail_last_dev.attr,
5494 &md_serialize_policy.attr,
5498 static const struct attribute_group md_default_group = {
5499 .attrs = md_default_attrs,
5502 static struct attribute *md_redundancy_attrs[] = {
5504 &md_last_scan_mode.attr,
5505 &md_mismatches.attr,
5508 &md_sync_speed.attr,
5509 &md_sync_force_parallel.attr,
5510 &md_sync_completed.attr,
5513 &md_suspend_lo.attr,
5514 &md_suspend_hi.attr,
5519 static const struct attribute_group md_redundancy_group = {
5521 .attrs = md_redundancy_attrs,
5524 static const struct attribute_group *md_attr_groups[] = {
5531 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5533 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5534 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5539 spin_lock(&all_mddevs_lock);
5540 if (list_empty(&mddev->all_mddevs)) {
5541 spin_unlock(&all_mddevs_lock);
5545 spin_unlock(&all_mddevs_lock);
5547 rv = entry->show(mddev, page);
5553 md_attr_store(struct kobject *kobj, struct attribute *attr,
5554 const char *page, size_t length)
5556 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5557 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5562 if (!capable(CAP_SYS_ADMIN))
5564 spin_lock(&all_mddevs_lock);
5565 if (list_empty(&mddev->all_mddevs)) {
5566 spin_unlock(&all_mddevs_lock);
5570 spin_unlock(&all_mddevs_lock);
5571 rv = entry->store(mddev, page, length);
5576 static void md_free(struct kobject *ko)
5578 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5580 if (mddev->sysfs_state)
5581 sysfs_put(mddev->sysfs_state);
5582 if (mddev->sysfs_level)
5583 sysfs_put(mddev->sysfs_level);
5585 if (mddev->gendisk) {
5586 del_gendisk(mddev->gendisk);
5587 blk_cleanup_disk(mddev->gendisk);
5589 percpu_ref_exit(&mddev->writes_pending);
5591 bioset_exit(&mddev->bio_set);
5592 bioset_exit(&mddev->sync_set);
5593 if (mddev->level != 1 && mddev->level != 10)
5594 bioset_exit(&mddev->io_acct_set);
5598 static const struct sysfs_ops md_sysfs_ops = {
5599 .show = md_attr_show,
5600 .store = md_attr_store,
5602 static struct kobj_type md_ktype = {
5604 .sysfs_ops = &md_sysfs_ops,
5605 .default_groups = md_attr_groups,
5610 static void mddev_delayed_delete(struct work_struct *ws)
5612 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5614 kobject_del(&mddev->kobj);
5615 kobject_put(&mddev->kobj);
5618 static void no_op(struct percpu_ref *r) {}
5620 int mddev_init_writes_pending(struct mddev *mddev)
5622 if (mddev->writes_pending.percpu_count_ptr)
5624 if (percpu_ref_init(&mddev->writes_pending, no_op,
5625 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5627 /* We want to start with the refcount at zero */
5628 percpu_ref_put(&mddev->writes_pending);
5631 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5633 static int md_alloc(dev_t dev, char *name)
5636 * If dev is zero, name is the name of a device to allocate with
5637 * an arbitrary minor number. It will be "md_???"
5638 * If dev is non-zero it must be a device number with a MAJOR of
5639 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5640 * the device is being created by opening a node in /dev.
5641 * If "name" is not NULL, the device is being created by
5642 * writing to /sys/module/md_mod/parameters/new_array.
5644 static DEFINE_MUTEX(disks_mutex);
5645 struct mddev *mddev;
5646 struct gendisk *disk;
5653 * Wait for any previous instance of this device to be completely
5654 * removed (mddev_delayed_delete).
5656 flush_workqueue(md_misc_wq);
5658 mutex_lock(&disks_mutex);
5659 mddev = mddev_alloc(dev);
5660 if (IS_ERR(mddev)) {
5661 mutex_unlock(&disks_mutex);
5662 return PTR_ERR(mddev);
5665 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5666 shift = partitioned ? MdpMinorShift : 0;
5667 unit = MINOR(mddev->unit) >> shift;
5670 /* Need to ensure that 'name' is not a duplicate.
5672 struct mddev *mddev2;
5673 spin_lock(&all_mddevs_lock);
5675 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5676 if (mddev2->gendisk &&
5677 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5678 spin_unlock(&all_mddevs_lock);
5680 goto out_unlock_disks_mutex;
5682 spin_unlock(&all_mddevs_lock);
5686 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5688 mddev->hold_active = UNTIL_STOP;
5691 disk = blk_alloc_disk(NUMA_NO_NODE);
5693 goto out_unlock_disks_mutex;
5695 disk->major = MAJOR(mddev->unit);
5696 disk->first_minor = unit << shift;
5697 disk->minors = 1 << shift;
5699 strcpy(disk->disk_name, name);
5700 else if (partitioned)
5701 sprintf(disk->disk_name, "md_d%d", unit);
5703 sprintf(disk->disk_name, "md%d", unit);
5704 disk->fops = &md_fops;
5705 disk->private_data = mddev;
5707 mddev->queue = disk->queue;
5708 blk_set_stacking_limits(&mddev->queue->limits);
5709 blk_queue_write_cache(mddev->queue, true, true);
5710 /* Allow extended partitions. This makes the
5711 * 'mdp' device redundant, but we can't really
5714 disk->flags |= GENHD_FL_EXT_DEVT;
5715 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5716 mddev->gendisk = disk;
5717 error = add_disk(disk);
5719 goto out_cleanup_disk;
5721 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5723 goto out_del_gendisk;
5725 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5726 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5727 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5728 goto out_unlock_disks_mutex;
5733 blk_cleanup_disk(disk);
5734 out_unlock_disks_mutex:
5735 mutex_unlock(&disks_mutex);
5740 static void md_probe(dev_t dev)
5742 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5745 md_alloc(dev, NULL);
5748 static int add_named_array(const char *val, const struct kernel_param *kp)
5751 * val must be "md_*" or "mdNNN".
5752 * For "md_*" we allocate an array with a large free minor number, and
5753 * set the name to val. val must not already be an active name.
5754 * For "mdNNN" we allocate an array with the minor number NNN
5755 * which must not already be in use.
5757 int len = strlen(val);
5758 char buf[DISK_NAME_LEN];
5759 unsigned long devnum;
5761 while (len && val[len-1] == '\n')
5763 if (len >= DISK_NAME_LEN)
5765 strlcpy(buf, val, len+1);
5766 if (strncmp(buf, "md_", 3) == 0)
5767 return md_alloc(0, buf);
5768 if (strncmp(buf, "md", 2) == 0 &&
5770 kstrtoul(buf+2, 10, &devnum) == 0 &&
5771 devnum <= MINORMASK)
5772 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5777 static void md_safemode_timeout(struct timer_list *t)
5779 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5781 mddev->safemode = 1;
5782 if (mddev->external)
5783 sysfs_notify_dirent_safe(mddev->sysfs_state);
5785 md_wakeup_thread(mddev->thread);
5788 static int start_dirty_degraded;
5790 int md_run(struct mddev *mddev)
5793 struct md_rdev *rdev;
5794 struct md_personality *pers;
5796 if (list_empty(&mddev->disks))
5797 /* cannot run an array with no devices.. */
5802 /* Cannot run until previous stop completes properly */
5803 if (mddev->sysfs_active)
5807 * Analyze all RAID superblock(s)
5809 if (!mddev->raid_disks) {
5810 if (!mddev->persistent)
5812 err = analyze_sbs(mddev);
5817 if (mddev->level != LEVEL_NONE)
5818 request_module("md-level-%d", mddev->level);
5819 else if (mddev->clevel[0])
5820 request_module("md-%s", mddev->clevel);
5823 * Drop all container device buffers, from now on
5824 * the only valid external interface is through the md
5827 mddev->has_superblocks = false;
5828 rdev_for_each(rdev, mddev) {
5829 if (test_bit(Faulty, &rdev->flags))
5831 sync_blockdev(rdev->bdev);
5832 invalidate_bdev(rdev->bdev);
5833 if (mddev->ro != 1 && rdev_read_only(rdev)) {
5836 set_disk_ro(mddev->gendisk, 1);
5840 mddev->has_superblocks = true;
5842 /* perform some consistency tests on the device.
5843 * We don't want the data to overlap the metadata,
5844 * Internal Bitmap issues have been handled elsewhere.
5846 if (rdev->meta_bdev) {
5847 /* Nothing to check */;
5848 } else if (rdev->data_offset < rdev->sb_start) {
5849 if (mddev->dev_sectors &&
5850 rdev->data_offset + mddev->dev_sectors
5852 pr_warn("md: %s: data overlaps metadata\n",
5857 if (rdev->sb_start + rdev->sb_size/512
5858 > rdev->data_offset) {
5859 pr_warn("md: %s: metadata overlaps data\n",
5864 sysfs_notify_dirent_safe(rdev->sysfs_state);
5867 if (!bioset_initialized(&mddev->bio_set)) {
5868 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5872 if (!bioset_initialized(&mddev->sync_set)) {
5873 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5877 if (mddev->level != 1 && mddev->level != 10 &&
5878 !bioset_initialized(&mddev->io_acct_set)) {
5879 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
5880 offsetof(struct md_io_acct, bio_clone), 0);
5885 spin_lock(&pers_lock);
5886 pers = find_pers(mddev->level, mddev->clevel);
5887 if (!pers || !try_module_get(pers->owner)) {
5888 spin_unlock(&pers_lock);
5889 if (mddev->level != LEVEL_NONE)
5890 pr_warn("md: personality for level %d is not loaded!\n",
5893 pr_warn("md: personality for level %s is not loaded!\n",
5898 spin_unlock(&pers_lock);
5899 if (mddev->level != pers->level) {
5900 mddev->level = pers->level;
5901 mddev->new_level = pers->level;
5903 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5905 if (mddev->reshape_position != MaxSector &&
5906 pers->start_reshape == NULL) {
5907 /* This personality cannot handle reshaping... */
5908 module_put(pers->owner);
5913 if (pers->sync_request) {
5914 /* Warn if this is a potentially silly
5917 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5918 struct md_rdev *rdev2;
5921 rdev_for_each(rdev, mddev)
5922 rdev_for_each(rdev2, mddev) {
5924 rdev->bdev->bd_disk ==
5925 rdev2->bdev->bd_disk) {
5926 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5928 bdevname(rdev->bdev,b),
5929 bdevname(rdev2->bdev,b2));
5935 pr_warn("True protection against single-disk failure might be compromised.\n");
5938 mddev->recovery = 0;
5939 /* may be over-ridden by personality */
5940 mddev->resync_max_sectors = mddev->dev_sectors;
5942 mddev->ok_start_degraded = start_dirty_degraded;
5944 if (start_readonly && mddev->ro == 0)
5945 mddev->ro = 2; /* read-only, but switch on first write */
5947 err = pers->run(mddev);
5949 pr_warn("md: pers->run() failed ...\n");
5950 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5951 WARN_ONCE(!mddev->external_size,
5952 "%s: default size too small, but 'external_size' not in effect?\n",
5954 pr_warn("md: invalid array_size %llu > default size %llu\n",
5955 (unsigned long long)mddev->array_sectors / 2,
5956 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5959 if (err == 0 && pers->sync_request &&
5960 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5961 struct bitmap *bitmap;
5963 bitmap = md_bitmap_create(mddev, -1);
5964 if (IS_ERR(bitmap)) {
5965 err = PTR_ERR(bitmap);
5966 pr_warn("%s: failed to create bitmap (%d)\n",
5967 mdname(mddev), err);
5969 mddev->bitmap = bitmap;
5975 if (mddev->bitmap_info.max_write_behind > 0) {
5976 bool create_pool = false;
5978 rdev_for_each(rdev, mddev) {
5979 if (test_bit(WriteMostly, &rdev->flags) &&
5980 rdev_init_serial(rdev))
5983 if (create_pool && mddev->serial_info_pool == NULL) {
5984 mddev->serial_info_pool =
5985 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5986 sizeof(struct serial_info));
5987 if (!mddev->serial_info_pool) {
5997 rdev_for_each(rdev, mddev) {
5998 if (rdev->raid_disk >= 0 &&
5999 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
6004 if (mddev->degraded)
6007 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6009 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6010 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6012 if (pers->sync_request) {
6013 if (mddev->kobj.sd &&
6014 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6015 pr_warn("md: cannot register extra attributes for %s\n",
6017 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6018 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6019 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6020 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6023 atomic_set(&mddev->max_corr_read_errors,
6024 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6025 mddev->safemode = 0;
6026 if (mddev_is_clustered(mddev))
6027 mddev->safemode_delay = 0;
6029 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6032 spin_lock(&mddev->lock);
6034 spin_unlock(&mddev->lock);
6035 rdev_for_each(rdev, mddev)
6036 if (rdev->raid_disk >= 0)
6037 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6039 if (mddev->degraded && !mddev->ro)
6040 /* This ensures that recovering status is reported immediately
6041 * via sysfs - until a lack of spares is confirmed.
6043 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6044 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6046 if (mddev->sb_flags)
6047 md_update_sb(mddev, 0);
6053 mddev_detach(mddev);
6055 pers->free(mddev, mddev->private);
6056 mddev->private = NULL;
6057 module_put(pers->owner);
6058 md_bitmap_destroy(mddev);
6060 if (mddev->level != 1 && mddev->level != 10)
6061 bioset_exit(&mddev->io_acct_set);
6063 bioset_exit(&mddev->sync_set);
6065 bioset_exit(&mddev->bio_set);
6068 EXPORT_SYMBOL_GPL(md_run);
6070 int do_md_run(struct mddev *mddev)
6074 set_bit(MD_NOT_READY, &mddev->flags);
6075 err = md_run(mddev);
6078 err = md_bitmap_load(mddev);
6080 md_bitmap_destroy(mddev);
6084 if (mddev_is_clustered(mddev))
6085 md_allow_write(mddev);
6087 /* run start up tasks that require md_thread */
6090 md_wakeup_thread(mddev->thread);
6091 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6093 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6094 clear_bit(MD_NOT_READY, &mddev->flags);
6096 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6097 sysfs_notify_dirent_safe(mddev->sysfs_state);
6098 sysfs_notify_dirent_safe(mddev->sysfs_action);
6099 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6101 clear_bit(MD_NOT_READY, &mddev->flags);
6105 int md_start(struct mddev *mddev)
6109 if (mddev->pers->start) {
6110 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6111 md_wakeup_thread(mddev->thread);
6112 ret = mddev->pers->start(mddev);
6113 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6114 md_wakeup_thread(mddev->sync_thread);
6118 EXPORT_SYMBOL_GPL(md_start);
6120 static int restart_array(struct mddev *mddev)
6122 struct gendisk *disk = mddev->gendisk;
6123 struct md_rdev *rdev;
6124 bool has_journal = false;
6125 bool has_readonly = false;
6127 /* Complain if it has no devices */
6128 if (list_empty(&mddev->disks))
6136 rdev_for_each_rcu(rdev, mddev) {
6137 if (test_bit(Journal, &rdev->flags) &&
6138 !test_bit(Faulty, &rdev->flags))
6140 if (rdev_read_only(rdev))
6141 has_readonly = true;
6144 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6145 /* Don't restart rw with journal missing/faulty */
6150 mddev->safemode = 0;
6152 set_disk_ro(disk, 0);
6153 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6154 /* Kick recovery or resync if necessary */
6155 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6156 md_wakeup_thread(mddev->thread);
6157 md_wakeup_thread(mddev->sync_thread);
6158 sysfs_notify_dirent_safe(mddev->sysfs_state);
6162 static void md_clean(struct mddev *mddev)
6164 mddev->array_sectors = 0;
6165 mddev->external_size = 0;
6166 mddev->dev_sectors = 0;
6167 mddev->raid_disks = 0;
6168 mddev->recovery_cp = 0;
6169 mddev->resync_min = 0;
6170 mddev->resync_max = MaxSector;
6171 mddev->reshape_position = MaxSector;
6172 mddev->external = 0;
6173 mddev->persistent = 0;
6174 mddev->level = LEVEL_NONE;
6175 mddev->clevel[0] = 0;
6177 mddev->sb_flags = 0;
6179 mddev->metadata_type[0] = 0;
6180 mddev->chunk_sectors = 0;
6181 mddev->ctime = mddev->utime = 0;
6183 mddev->max_disks = 0;
6185 mddev->can_decrease_events = 0;
6186 mddev->delta_disks = 0;
6187 mddev->reshape_backwards = 0;
6188 mddev->new_level = LEVEL_NONE;
6189 mddev->new_layout = 0;
6190 mddev->new_chunk_sectors = 0;
6191 mddev->curr_resync = 0;
6192 atomic64_set(&mddev->resync_mismatches, 0);
6193 mddev->suspend_lo = mddev->suspend_hi = 0;
6194 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6195 mddev->recovery = 0;
6198 mddev->degraded = 0;
6199 mddev->safemode = 0;
6200 mddev->private = NULL;
6201 mddev->cluster_info = NULL;
6202 mddev->bitmap_info.offset = 0;
6203 mddev->bitmap_info.default_offset = 0;
6204 mddev->bitmap_info.default_space = 0;
6205 mddev->bitmap_info.chunksize = 0;
6206 mddev->bitmap_info.daemon_sleep = 0;
6207 mddev->bitmap_info.max_write_behind = 0;
6208 mddev->bitmap_info.nodes = 0;
6211 static void __md_stop_writes(struct mddev *mddev)
6213 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6214 if (work_pending(&mddev->del_work))
6215 flush_workqueue(md_misc_wq);
6216 if (mddev->sync_thread) {
6217 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6218 md_reap_sync_thread(mddev);
6221 del_timer_sync(&mddev->safemode_timer);
6223 if (mddev->pers && mddev->pers->quiesce) {
6224 mddev->pers->quiesce(mddev, 1);
6225 mddev->pers->quiesce(mddev, 0);
6227 md_bitmap_flush(mddev);
6229 if (mddev->ro == 0 &&
6230 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6232 /* mark array as shutdown cleanly */
6233 if (!mddev_is_clustered(mddev))
6235 md_update_sb(mddev, 1);
6237 /* disable policy to guarantee rdevs free resources for serialization */
6238 mddev->serialize_policy = 0;
6239 mddev_destroy_serial_pool(mddev, NULL, true);
6242 void md_stop_writes(struct mddev *mddev)
6244 mddev_lock_nointr(mddev);
6245 __md_stop_writes(mddev);
6246 mddev_unlock(mddev);
6248 EXPORT_SYMBOL_GPL(md_stop_writes);
6250 static void mddev_detach(struct mddev *mddev)
6252 md_bitmap_wait_behind_writes(mddev);
6253 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6254 mddev->pers->quiesce(mddev, 1);
6255 mddev->pers->quiesce(mddev, 0);
6257 md_unregister_thread(&mddev->thread);
6259 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6262 static void __md_stop(struct mddev *mddev)
6264 struct md_personality *pers = mddev->pers;
6265 md_bitmap_destroy(mddev);
6266 mddev_detach(mddev);
6267 /* Ensure ->event_work is done */
6268 if (mddev->event_work.func)
6269 flush_workqueue(md_misc_wq);
6270 spin_lock(&mddev->lock);
6272 spin_unlock(&mddev->lock);
6273 pers->free(mddev, mddev->private);
6274 mddev->private = NULL;
6275 if (pers->sync_request && mddev->to_remove == NULL)
6276 mddev->to_remove = &md_redundancy_group;
6277 module_put(pers->owner);
6278 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6281 void md_stop(struct mddev *mddev)
6283 /* stop the array and free an attached data structures.
6284 * This is called from dm-raid
6287 bioset_exit(&mddev->bio_set);
6288 bioset_exit(&mddev->sync_set);
6289 if (mddev->level != 1 && mddev->level != 10)
6290 bioset_exit(&mddev->io_acct_set);
6293 EXPORT_SYMBOL_GPL(md_stop);
6295 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6300 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6302 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6303 md_wakeup_thread(mddev->thread);
6305 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6306 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6307 if (mddev->sync_thread)
6308 /* Thread might be blocked waiting for metadata update
6309 * which will now never happen */
6310 wake_up_process(mddev->sync_thread->tsk);
6312 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6314 mddev_unlock(mddev);
6315 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6317 wait_event(mddev->sb_wait,
6318 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6319 mddev_lock_nointr(mddev);
6321 mutex_lock(&mddev->open_mutex);
6322 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6323 mddev->sync_thread ||
6324 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6325 pr_warn("md: %s still in use.\n",mdname(mddev));
6327 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6328 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6329 md_wakeup_thread(mddev->thread);
6335 __md_stop_writes(mddev);
6341 set_disk_ro(mddev->gendisk, 1);
6342 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6343 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6344 md_wakeup_thread(mddev->thread);
6345 sysfs_notify_dirent_safe(mddev->sysfs_state);
6349 mutex_unlock(&mddev->open_mutex);
6354 * 0 - completely stop and dis-assemble array
6355 * 2 - stop but do not disassemble array
6357 static int do_md_stop(struct mddev *mddev, int mode,
6358 struct block_device *bdev)
6360 struct gendisk *disk = mddev->gendisk;
6361 struct md_rdev *rdev;
6364 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6366 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6367 md_wakeup_thread(mddev->thread);
6369 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6370 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6371 if (mddev->sync_thread)
6372 /* Thread might be blocked waiting for metadata update
6373 * which will now never happen */
6374 wake_up_process(mddev->sync_thread->tsk);
6376 mddev_unlock(mddev);
6377 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6378 !test_bit(MD_RECOVERY_RUNNING,
6379 &mddev->recovery)));
6380 mddev_lock_nointr(mddev);
6382 mutex_lock(&mddev->open_mutex);
6383 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6384 mddev->sysfs_active ||
6385 mddev->sync_thread ||
6386 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6387 pr_warn("md: %s still in use.\n",mdname(mddev));
6388 mutex_unlock(&mddev->open_mutex);
6390 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6391 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6392 md_wakeup_thread(mddev->thread);
6398 set_disk_ro(disk, 0);
6400 __md_stop_writes(mddev);
6403 /* tell userspace to handle 'inactive' */
6404 sysfs_notify_dirent_safe(mddev->sysfs_state);
6406 rdev_for_each(rdev, mddev)
6407 if (rdev->raid_disk >= 0)
6408 sysfs_unlink_rdev(mddev, rdev);
6410 set_capacity_and_notify(disk, 0);
6411 mutex_unlock(&mddev->open_mutex);
6417 mutex_unlock(&mddev->open_mutex);
6419 * Free resources if final stop
6422 pr_info("md: %s stopped.\n", mdname(mddev));
6424 if (mddev->bitmap_info.file) {
6425 struct file *f = mddev->bitmap_info.file;
6426 spin_lock(&mddev->lock);
6427 mddev->bitmap_info.file = NULL;
6428 spin_unlock(&mddev->lock);
6431 mddev->bitmap_info.offset = 0;
6433 export_array(mddev);
6436 if (mddev->hold_active == UNTIL_STOP)
6437 mddev->hold_active = 0;
6440 sysfs_notify_dirent_safe(mddev->sysfs_state);
6445 static void autorun_array(struct mddev *mddev)
6447 struct md_rdev *rdev;
6450 if (list_empty(&mddev->disks))
6453 pr_info("md: running: ");
6455 rdev_for_each(rdev, mddev) {
6456 char b[BDEVNAME_SIZE];
6457 pr_cont("<%s>", bdevname(rdev->bdev,b));
6461 err = do_md_run(mddev);
6463 pr_warn("md: do_md_run() returned %d\n", err);
6464 do_md_stop(mddev, 0, NULL);
6469 * lets try to run arrays based on all disks that have arrived
6470 * until now. (those are in pending_raid_disks)
6472 * the method: pick the first pending disk, collect all disks with
6473 * the same UUID, remove all from the pending list and put them into
6474 * the 'same_array' list. Then order this list based on superblock
6475 * update time (freshest comes first), kick out 'old' disks and
6476 * compare superblocks. If everything's fine then run it.
6478 * If "unit" is allocated, then bump its reference count
6480 static void autorun_devices(int part)
6482 struct md_rdev *rdev0, *rdev, *tmp;
6483 struct mddev *mddev;
6484 char b[BDEVNAME_SIZE];
6486 pr_info("md: autorun ...\n");
6487 while (!list_empty(&pending_raid_disks)) {
6490 LIST_HEAD(candidates);
6491 rdev0 = list_entry(pending_raid_disks.next,
6492 struct md_rdev, same_set);
6494 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6495 INIT_LIST_HEAD(&candidates);
6496 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6497 if (super_90_load(rdev, rdev0, 0) >= 0) {
6498 pr_debug("md: adding %s ...\n",
6499 bdevname(rdev->bdev,b));
6500 list_move(&rdev->same_set, &candidates);
6503 * now we have a set of devices, with all of them having
6504 * mostly sane superblocks. It's time to allocate the
6508 dev = MKDEV(mdp_major,
6509 rdev0->preferred_minor << MdpMinorShift);
6510 unit = MINOR(dev) >> MdpMinorShift;
6512 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6515 if (rdev0->preferred_minor != unit) {
6516 pr_warn("md: unit number in %s is bad: %d\n",
6517 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6522 mddev = mddev_find(dev);
6526 if (mddev_lock(mddev))
6527 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6528 else if (mddev->raid_disks || mddev->major_version
6529 || !list_empty(&mddev->disks)) {
6530 pr_warn("md: %s already running, cannot run %s\n",
6531 mdname(mddev), bdevname(rdev0->bdev,b));
6532 mddev_unlock(mddev);
6534 pr_debug("md: created %s\n", mdname(mddev));
6535 mddev->persistent = 1;
6536 rdev_for_each_list(rdev, tmp, &candidates) {
6537 list_del_init(&rdev->same_set);
6538 if (bind_rdev_to_array(rdev, mddev))
6541 autorun_array(mddev);
6542 mddev_unlock(mddev);
6544 /* on success, candidates will be empty, on error
6547 rdev_for_each_list(rdev, tmp, &candidates) {
6548 list_del_init(&rdev->same_set);
6553 pr_info("md: ... autorun DONE.\n");
6555 #endif /* !MODULE */
6557 static int get_version(void __user *arg)
6561 ver.major = MD_MAJOR_VERSION;
6562 ver.minor = MD_MINOR_VERSION;
6563 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6565 if (copy_to_user(arg, &ver, sizeof(ver)))
6571 static int get_array_info(struct mddev *mddev, void __user *arg)
6573 mdu_array_info_t info;
6574 int nr,working,insync,failed,spare;
6575 struct md_rdev *rdev;
6577 nr = working = insync = failed = spare = 0;
6579 rdev_for_each_rcu(rdev, mddev) {
6581 if (test_bit(Faulty, &rdev->flags))
6585 if (test_bit(In_sync, &rdev->flags))
6587 else if (test_bit(Journal, &rdev->flags))
6588 /* TODO: add journal count to md_u.h */
6596 info.major_version = mddev->major_version;
6597 info.minor_version = mddev->minor_version;
6598 info.patch_version = MD_PATCHLEVEL_VERSION;
6599 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6600 info.level = mddev->level;
6601 info.size = mddev->dev_sectors / 2;
6602 if (info.size != mddev->dev_sectors / 2) /* overflow */
6605 info.raid_disks = mddev->raid_disks;
6606 info.md_minor = mddev->md_minor;
6607 info.not_persistent= !mddev->persistent;
6609 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6612 info.state = (1<<MD_SB_CLEAN);
6613 if (mddev->bitmap && mddev->bitmap_info.offset)
6614 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6615 if (mddev_is_clustered(mddev))
6616 info.state |= (1<<MD_SB_CLUSTERED);
6617 info.active_disks = insync;
6618 info.working_disks = working;
6619 info.failed_disks = failed;
6620 info.spare_disks = spare;
6622 info.layout = mddev->layout;
6623 info.chunk_size = mddev->chunk_sectors << 9;
6625 if (copy_to_user(arg, &info, sizeof(info)))
6631 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6633 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6637 file = kzalloc(sizeof(*file), GFP_NOIO);
6642 spin_lock(&mddev->lock);
6643 /* bitmap enabled */
6644 if (mddev->bitmap_info.file) {
6645 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6646 sizeof(file->pathname));
6650 memmove(file->pathname, ptr,
6651 sizeof(file->pathname)-(ptr-file->pathname));
6653 spin_unlock(&mddev->lock);
6656 copy_to_user(arg, file, sizeof(*file)))
6663 static int get_disk_info(struct mddev *mddev, void __user * arg)
6665 mdu_disk_info_t info;
6666 struct md_rdev *rdev;
6668 if (copy_from_user(&info, arg, sizeof(info)))
6672 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6674 info.major = MAJOR(rdev->bdev->bd_dev);
6675 info.minor = MINOR(rdev->bdev->bd_dev);
6676 info.raid_disk = rdev->raid_disk;
6678 if (test_bit(Faulty, &rdev->flags))
6679 info.state |= (1<<MD_DISK_FAULTY);
6680 else if (test_bit(In_sync, &rdev->flags)) {
6681 info.state |= (1<<MD_DISK_ACTIVE);
6682 info.state |= (1<<MD_DISK_SYNC);
6684 if (test_bit(Journal, &rdev->flags))
6685 info.state |= (1<<MD_DISK_JOURNAL);
6686 if (test_bit(WriteMostly, &rdev->flags))
6687 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6688 if (test_bit(FailFast, &rdev->flags))
6689 info.state |= (1<<MD_DISK_FAILFAST);
6691 info.major = info.minor = 0;
6692 info.raid_disk = -1;
6693 info.state = (1<<MD_DISK_REMOVED);
6697 if (copy_to_user(arg, &info, sizeof(info)))
6703 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6705 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6706 struct md_rdev *rdev;
6707 dev_t dev = MKDEV(info->major,info->minor);
6709 if (mddev_is_clustered(mddev) &&
6710 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6711 pr_warn("%s: Cannot add to clustered mddev.\n",
6716 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6719 if (!mddev->raid_disks) {
6721 /* expecting a device which has a superblock */
6722 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6724 pr_warn("md: md_import_device returned %ld\n",
6726 return PTR_ERR(rdev);
6728 if (!list_empty(&mddev->disks)) {
6729 struct md_rdev *rdev0
6730 = list_entry(mddev->disks.next,
6731 struct md_rdev, same_set);
6732 err = super_types[mddev->major_version]
6733 .load_super(rdev, rdev0, mddev->minor_version);
6735 pr_warn("md: %s has different UUID to %s\n",
6736 bdevname(rdev->bdev,b),
6737 bdevname(rdev0->bdev,b2));
6742 err = bind_rdev_to_array(rdev, mddev);
6749 * md_add_new_disk can be used once the array is assembled
6750 * to add "hot spares". They must already have a superblock
6755 if (!mddev->pers->hot_add_disk) {
6756 pr_warn("%s: personality does not support diskops!\n",
6760 if (mddev->persistent)
6761 rdev = md_import_device(dev, mddev->major_version,
6762 mddev->minor_version);
6764 rdev = md_import_device(dev, -1, -1);
6766 pr_warn("md: md_import_device returned %ld\n",
6768 return PTR_ERR(rdev);
6770 /* set saved_raid_disk if appropriate */
6771 if (!mddev->persistent) {
6772 if (info->state & (1<<MD_DISK_SYNC) &&
6773 info->raid_disk < mddev->raid_disks) {
6774 rdev->raid_disk = info->raid_disk;
6775 set_bit(In_sync, &rdev->flags);
6776 clear_bit(Bitmap_sync, &rdev->flags);
6778 rdev->raid_disk = -1;
6779 rdev->saved_raid_disk = rdev->raid_disk;
6781 super_types[mddev->major_version].
6782 validate_super(mddev, rdev);
6783 if ((info->state & (1<<MD_DISK_SYNC)) &&
6784 rdev->raid_disk != info->raid_disk) {
6785 /* This was a hot-add request, but events doesn't
6786 * match, so reject it.
6792 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6793 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6794 set_bit(WriteMostly, &rdev->flags);
6796 clear_bit(WriteMostly, &rdev->flags);
6797 if (info->state & (1<<MD_DISK_FAILFAST))
6798 set_bit(FailFast, &rdev->flags);
6800 clear_bit(FailFast, &rdev->flags);
6802 if (info->state & (1<<MD_DISK_JOURNAL)) {
6803 struct md_rdev *rdev2;
6804 bool has_journal = false;
6806 /* make sure no existing journal disk */
6807 rdev_for_each(rdev2, mddev) {
6808 if (test_bit(Journal, &rdev2->flags)) {
6813 if (has_journal || mddev->bitmap) {
6817 set_bit(Journal, &rdev->flags);
6820 * check whether the device shows up in other nodes
6822 if (mddev_is_clustered(mddev)) {
6823 if (info->state & (1 << MD_DISK_CANDIDATE))
6824 set_bit(Candidate, &rdev->flags);
6825 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6826 /* --add initiated by this node */
6827 err = md_cluster_ops->add_new_disk(mddev, rdev);
6835 rdev->raid_disk = -1;
6836 err = bind_rdev_to_array(rdev, mddev);
6841 if (mddev_is_clustered(mddev)) {
6842 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6844 err = md_cluster_ops->new_disk_ack(mddev,
6847 md_kick_rdev_from_array(rdev);
6851 md_cluster_ops->add_new_disk_cancel(mddev);
6853 err = add_bound_rdev(rdev);
6857 err = add_bound_rdev(rdev);
6862 /* otherwise, md_add_new_disk is only allowed
6863 * for major_version==0 superblocks
6865 if (mddev->major_version != 0) {
6866 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6870 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6872 rdev = md_import_device(dev, -1, 0);
6874 pr_warn("md: error, md_import_device() returned %ld\n",
6876 return PTR_ERR(rdev);
6878 rdev->desc_nr = info->number;
6879 if (info->raid_disk < mddev->raid_disks)
6880 rdev->raid_disk = info->raid_disk;
6882 rdev->raid_disk = -1;
6884 if (rdev->raid_disk < mddev->raid_disks)
6885 if (info->state & (1<<MD_DISK_SYNC))
6886 set_bit(In_sync, &rdev->flags);
6888 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6889 set_bit(WriteMostly, &rdev->flags);
6890 if (info->state & (1<<MD_DISK_FAILFAST))
6891 set_bit(FailFast, &rdev->flags);
6893 if (!mddev->persistent) {
6894 pr_debug("md: nonpersistent superblock ...\n");
6895 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6897 rdev->sb_start = calc_dev_sboffset(rdev);
6898 rdev->sectors = rdev->sb_start;
6900 err = bind_rdev_to_array(rdev, mddev);
6910 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6912 char b[BDEVNAME_SIZE];
6913 struct md_rdev *rdev;
6918 rdev = find_rdev(mddev, dev);
6922 if (rdev->raid_disk < 0)
6925 clear_bit(Blocked, &rdev->flags);
6926 remove_and_add_spares(mddev, rdev);
6928 if (rdev->raid_disk >= 0)
6932 if (mddev_is_clustered(mddev)) {
6933 if (md_cluster_ops->remove_disk(mddev, rdev))
6937 md_kick_rdev_from_array(rdev);
6938 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6940 md_wakeup_thread(mddev->thread);
6942 md_update_sb(mddev, 1);
6947 pr_debug("md: cannot remove active disk %s from %s ...\n",
6948 bdevname(rdev->bdev,b), mdname(mddev));
6952 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6954 char b[BDEVNAME_SIZE];
6956 struct md_rdev *rdev;
6961 if (mddev->major_version != 0) {
6962 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6966 if (!mddev->pers->hot_add_disk) {
6967 pr_warn("%s: personality does not support diskops!\n",
6972 rdev = md_import_device(dev, -1, 0);
6974 pr_warn("md: error, md_import_device() returned %ld\n",
6979 if (mddev->persistent)
6980 rdev->sb_start = calc_dev_sboffset(rdev);
6982 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6984 rdev->sectors = rdev->sb_start;
6986 if (test_bit(Faulty, &rdev->flags)) {
6987 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6988 bdevname(rdev->bdev,b), mdname(mddev));
6993 clear_bit(In_sync, &rdev->flags);
6995 rdev->saved_raid_disk = -1;
6996 err = bind_rdev_to_array(rdev, mddev);
7001 * The rest should better be atomic, we can have disk failures
7002 * noticed in interrupt contexts ...
7005 rdev->raid_disk = -1;
7007 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7009 md_update_sb(mddev, 1);
7011 * Kick recovery, maybe this spare has to be added to the
7012 * array immediately.
7014 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7015 md_wakeup_thread(mddev->thread);
7024 static int set_bitmap_file(struct mddev *mddev, int fd)
7029 if (!mddev->pers->quiesce || !mddev->thread)
7031 if (mddev->recovery || mddev->sync_thread)
7033 /* we should be able to change the bitmap.. */
7037 struct inode *inode;
7040 if (mddev->bitmap || mddev->bitmap_info.file)
7041 return -EEXIST; /* cannot add when bitmap is present */
7045 pr_warn("%s: error: failed to get bitmap file\n",
7050 inode = f->f_mapping->host;
7051 if (!S_ISREG(inode->i_mode)) {
7052 pr_warn("%s: error: bitmap file must be a regular file\n",
7055 } else if (!(f->f_mode & FMODE_WRITE)) {
7056 pr_warn("%s: error: bitmap file must open for write\n",
7059 } else if (atomic_read(&inode->i_writecount) != 1) {
7060 pr_warn("%s: error: bitmap file is already in use\n",
7068 mddev->bitmap_info.file = f;
7069 mddev->bitmap_info.offset = 0; /* file overrides offset */
7070 } else if (mddev->bitmap == NULL)
7071 return -ENOENT; /* cannot remove what isn't there */
7075 struct bitmap *bitmap;
7077 bitmap = md_bitmap_create(mddev, -1);
7078 mddev_suspend(mddev);
7079 if (!IS_ERR(bitmap)) {
7080 mddev->bitmap = bitmap;
7081 err = md_bitmap_load(mddev);
7083 err = PTR_ERR(bitmap);
7085 md_bitmap_destroy(mddev);
7088 mddev_resume(mddev);
7089 } else if (fd < 0) {
7090 mddev_suspend(mddev);
7091 md_bitmap_destroy(mddev);
7092 mddev_resume(mddev);
7096 struct file *f = mddev->bitmap_info.file;
7098 spin_lock(&mddev->lock);
7099 mddev->bitmap_info.file = NULL;
7100 spin_unlock(&mddev->lock);
7109 * md_set_array_info is used two different ways
7110 * The original usage is when creating a new array.
7111 * In this usage, raid_disks is > 0 and it together with
7112 * level, size, not_persistent,layout,chunksize determine the
7113 * shape of the array.
7114 * This will always create an array with a type-0.90.0 superblock.
7115 * The newer usage is when assembling an array.
7116 * In this case raid_disks will be 0, and the major_version field is
7117 * use to determine which style super-blocks are to be found on the devices.
7118 * The minor and patch _version numbers are also kept incase the
7119 * super_block handler wishes to interpret them.
7121 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7123 if (info->raid_disks == 0) {
7124 /* just setting version number for superblock loading */
7125 if (info->major_version < 0 ||
7126 info->major_version >= ARRAY_SIZE(super_types) ||
7127 super_types[info->major_version].name == NULL) {
7128 /* maybe try to auto-load a module? */
7129 pr_warn("md: superblock version %d not known\n",
7130 info->major_version);
7133 mddev->major_version = info->major_version;
7134 mddev->minor_version = info->minor_version;
7135 mddev->patch_version = info->patch_version;
7136 mddev->persistent = !info->not_persistent;
7137 /* ensure mddev_put doesn't delete this now that there
7138 * is some minimal configuration.
7140 mddev->ctime = ktime_get_real_seconds();
7143 mddev->major_version = MD_MAJOR_VERSION;
7144 mddev->minor_version = MD_MINOR_VERSION;
7145 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7146 mddev->ctime = ktime_get_real_seconds();
7148 mddev->level = info->level;
7149 mddev->clevel[0] = 0;
7150 mddev->dev_sectors = 2 * (sector_t)info->size;
7151 mddev->raid_disks = info->raid_disks;
7152 /* don't set md_minor, it is determined by which /dev/md* was
7155 if (info->state & (1<<MD_SB_CLEAN))
7156 mddev->recovery_cp = MaxSector;
7158 mddev->recovery_cp = 0;
7159 mddev->persistent = ! info->not_persistent;
7160 mddev->external = 0;
7162 mddev->layout = info->layout;
7163 if (mddev->level == 0)
7164 /* Cannot trust RAID0 layout info here */
7166 mddev->chunk_sectors = info->chunk_size >> 9;
7168 if (mddev->persistent) {
7169 mddev->max_disks = MD_SB_DISKS;
7171 mddev->sb_flags = 0;
7173 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7175 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7176 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7177 mddev->bitmap_info.offset = 0;
7179 mddev->reshape_position = MaxSector;
7182 * Generate a 128 bit UUID
7184 get_random_bytes(mddev->uuid, 16);
7186 mddev->new_level = mddev->level;
7187 mddev->new_chunk_sectors = mddev->chunk_sectors;
7188 mddev->new_layout = mddev->layout;
7189 mddev->delta_disks = 0;
7190 mddev->reshape_backwards = 0;
7195 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7197 lockdep_assert_held(&mddev->reconfig_mutex);
7199 if (mddev->external_size)
7202 mddev->array_sectors = array_sectors;
7204 EXPORT_SYMBOL(md_set_array_sectors);
7206 static int update_size(struct mddev *mddev, sector_t num_sectors)
7208 struct md_rdev *rdev;
7210 int fit = (num_sectors == 0);
7211 sector_t old_dev_sectors = mddev->dev_sectors;
7213 if (mddev->pers->resize == NULL)
7215 /* The "num_sectors" is the number of sectors of each device that
7216 * is used. This can only make sense for arrays with redundancy.
7217 * linear and raid0 always use whatever space is available. We can only
7218 * consider changing this number if no resync or reconstruction is
7219 * happening, and if the new size is acceptable. It must fit before the
7220 * sb_start or, if that is <data_offset, it must fit before the size
7221 * of each device. If num_sectors is zero, we find the largest size
7224 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7230 rdev_for_each(rdev, mddev) {
7231 sector_t avail = rdev->sectors;
7233 if (fit && (num_sectors == 0 || num_sectors > avail))
7234 num_sectors = avail;
7235 if (avail < num_sectors)
7238 rv = mddev->pers->resize(mddev, num_sectors);
7240 if (mddev_is_clustered(mddev))
7241 md_cluster_ops->update_size(mddev, old_dev_sectors);
7242 else if (mddev->queue) {
7243 set_capacity_and_notify(mddev->gendisk,
7244 mddev->array_sectors);
7250 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7253 struct md_rdev *rdev;
7254 /* change the number of raid disks */
7255 if (mddev->pers->check_reshape == NULL)
7259 if (raid_disks <= 0 ||
7260 (mddev->max_disks && raid_disks >= mddev->max_disks))
7262 if (mddev->sync_thread ||
7263 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7264 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7265 mddev->reshape_position != MaxSector)
7268 rdev_for_each(rdev, mddev) {
7269 if (mddev->raid_disks < raid_disks &&
7270 rdev->data_offset < rdev->new_data_offset)
7272 if (mddev->raid_disks > raid_disks &&
7273 rdev->data_offset > rdev->new_data_offset)
7277 mddev->delta_disks = raid_disks - mddev->raid_disks;
7278 if (mddev->delta_disks < 0)
7279 mddev->reshape_backwards = 1;
7280 else if (mddev->delta_disks > 0)
7281 mddev->reshape_backwards = 0;
7283 rv = mddev->pers->check_reshape(mddev);
7285 mddev->delta_disks = 0;
7286 mddev->reshape_backwards = 0;
7292 * update_array_info is used to change the configuration of an
7294 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7295 * fields in the info are checked against the array.
7296 * Any differences that cannot be handled will cause an error.
7297 * Normally, only one change can be managed at a time.
7299 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7305 /* calculate expected state,ignoring low bits */
7306 if (mddev->bitmap && mddev->bitmap_info.offset)
7307 state |= (1 << MD_SB_BITMAP_PRESENT);
7309 if (mddev->major_version != info->major_version ||
7310 mddev->minor_version != info->minor_version ||
7311 /* mddev->patch_version != info->patch_version || */
7312 mddev->ctime != info->ctime ||
7313 mddev->level != info->level ||
7314 /* mddev->layout != info->layout || */
7315 mddev->persistent != !info->not_persistent ||
7316 mddev->chunk_sectors != info->chunk_size >> 9 ||
7317 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7318 ((state^info->state) & 0xfffffe00)
7321 /* Check there is only one change */
7322 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7324 if (mddev->raid_disks != info->raid_disks)
7326 if (mddev->layout != info->layout)
7328 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7335 if (mddev->layout != info->layout) {
7337 * we don't need to do anything at the md level, the
7338 * personality will take care of it all.
7340 if (mddev->pers->check_reshape == NULL)
7343 mddev->new_layout = info->layout;
7344 rv = mddev->pers->check_reshape(mddev);
7346 mddev->new_layout = mddev->layout;
7350 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7351 rv = update_size(mddev, (sector_t)info->size * 2);
7353 if (mddev->raid_disks != info->raid_disks)
7354 rv = update_raid_disks(mddev, info->raid_disks);
7356 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7357 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7361 if (mddev->recovery || mddev->sync_thread) {
7365 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7366 struct bitmap *bitmap;
7367 /* add the bitmap */
7368 if (mddev->bitmap) {
7372 if (mddev->bitmap_info.default_offset == 0) {
7376 mddev->bitmap_info.offset =
7377 mddev->bitmap_info.default_offset;
7378 mddev->bitmap_info.space =
7379 mddev->bitmap_info.default_space;
7380 bitmap = md_bitmap_create(mddev, -1);
7381 mddev_suspend(mddev);
7382 if (!IS_ERR(bitmap)) {
7383 mddev->bitmap = bitmap;
7384 rv = md_bitmap_load(mddev);
7386 rv = PTR_ERR(bitmap);
7388 md_bitmap_destroy(mddev);
7389 mddev_resume(mddev);
7391 /* remove the bitmap */
7392 if (!mddev->bitmap) {
7396 if (mddev->bitmap->storage.file) {
7400 if (mddev->bitmap_info.nodes) {
7401 /* hold PW on all the bitmap lock */
7402 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7403 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7405 md_cluster_ops->unlock_all_bitmaps(mddev);
7409 mddev->bitmap_info.nodes = 0;
7410 md_cluster_ops->leave(mddev);
7411 module_put(md_cluster_mod);
7412 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7414 mddev_suspend(mddev);
7415 md_bitmap_destroy(mddev);
7416 mddev_resume(mddev);
7417 mddev->bitmap_info.offset = 0;
7420 md_update_sb(mddev, 1);
7426 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7428 struct md_rdev *rdev;
7431 if (mddev->pers == NULL)
7435 rdev = md_find_rdev_rcu(mddev, dev);
7439 md_error(mddev, rdev);
7440 if (!test_bit(Faulty, &rdev->flags))
7448 * We have a problem here : there is no easy way to give a CHS
7449 * virtual geometry. We currently pretend that we have a 2 heads
7450 * 4 sectors (with a BIG number of cylinders...). This drives
7451 * dosfs just mad... ;-)
7453 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7455 struct mddev *mddev = bdev->bd_disk->private_data;
7459 geo->cylinders = mddev->array_sectors / 8;
7463 static inline bool md_ioctl_valid(unsigned int cmd)
7467 case GET_ARRAY_INFO:
7468 case GET_BITMAP_FILE:
7471 case HOT_REMOVE_DISK:
7473 case RESTART_ARRAY_RW:
7475 case SET_ARRAY_INFO:
7476 case SET_BITMAP_FILE:
7477 case SET_DISK_FAULTY:
7480 case CLUSTERED_DISK_NACK:
7487 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7488 unsigned int cmd, unsigned long arg)
7491 void __user *argp = (void __user *)arg;
7492 struct mddev *mddev = NULL;
7493 bool did_set_md_closing = false;
7495 if (!md_ioctl_valid(cmd))
7500 case GET_ARRAY_INFO:
7504 if (!capable(CAP_SYS_ADMIN))
7509 * Commands dealing with the RAID driver but not any
7514 err = get_version(argp);
7520 * Commands creating/starting a new array:
7523 mddev = bdev->bd_disk->private_data;
7530 /* Some actions do not requires the mutex */
7532 case GET_ARRAY_INFO:
7533 if (!mddev->raid_disks && !mddev->external)
7536 err = get_array_info(mddev, argp);
7540 if (!mddev->raid_disks && !mddev->external)
7543 err = get_disk_info(mddev, argp);
7546 case SET_DISK_FAULTY:
7547 err = set_disk_faulty(mddev, new_decode_dev(arg));
7550 case GET_BITMAP_FILE:
7551 err = get_bitmap_file(mddev, argp);
7556 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7557 flush_rdev_wq(mddev);
7559 if (cmd == HOT_REMOVE_DISK)
7560 /* need to ensure recovery thread has run */
7561 wait_event_interruptible_timeout(mddev->sb_wait,
7562 !test_bit(MD_RECOVERY_NEEDED,
7564 msecs_to_jiffies(5000));
7565 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7566 /* Need to flush page cache, and ensure no-one else opens
7569 mutex_lock(&mddev->open_mutex);
7570 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7571 mutex_unlock(&mddev->open_mutex);
7575 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7576 mutex_unlock(&mddev->open_mutex);
7580 did_set_md_closing = true;
7581 mutex_unlock(&mddev->open_mutex);
7582 sync_blockdev(bdev);
7584 err = mddev_lock(mddev);
7586 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7591 if (cmd == SET_ARRAY_INFO) {
7592 mdu_array_info_t info;
7594 memset(&info, 0, sizeof(info));
7595 else if (copy_from_user(&info, argp, sizeof(info))) {
7600 err = update_array_info(mddev, &info);
7602 pr_warn("md: couldn't update array info. %d\n", err);
7607 if (!list_empty(&mddev->disks)) {
7608 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7612 if (mddev->raid_disks) {
7613 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7617 err = md_set_array_info(mddev, &info);
7619 pr_warn("md: couldn't set array info. %d\n", err);
7626 * Commands querying/configuring an existing array:
7628 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7629 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7630 if ((!mddev->raid_disks && !mddev->external)
7631 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7632 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7633 && cmd != GET_BITMAP_FILE) {
7639 * Commands even a read-only array can execute:
7642 case RESTART_ARRAY_RW:
7643 err = restart_array(mddev);
7647 err = do_md_stop(mddev, 0, bdev);
7651 err = md_set_readonly(mddev, bdev);
7654 case HOT_REMOVE_DISK:
7655 err = hot_remove_disk(mddev, new_decode_dev(arg));
7659 /* We can support ADD_NEW_DISK on read-only arrays
7660 * only if we are re-adding a preexisting device.
7661 * So require mddev->pers and MD_DISK_SYNC.
7664 mdu_disk_info_t info;
7665 if (copy_from_user(&info, argp, sizeof(info)))
7667 else if (!(info.state & (1<<MD_DISK_SYNC)))
7668 /* Need to clear read-only for this */
7671 err = md_add_new_disk(mddev, &info);
7678 * The remaining ioctls are changing the state of the
7679 * superblock, so we do not allow them on read-only arrays.
7681 if (mddev->ro && mddev->pers) {
7682 if (mddev->ro == 2) {
7684 sysfs_notify_dirent_safe(mddev->sysfs_state);
7685 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7686 /* mddev_unlock will wake thread */
7687 /* If a device failed while we were read-only, we
7688 * need to make sure the metadata is updated now.
7690 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7691 mddev_unlock(mddev);
7692 wait_event(mddev->sb_wait,
7693 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7694 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7695 mddev_lock_nointr(mddev);
7706 mdu_disk_info_t info;
7707 if (copy_from_user(&info, argp, sizeof(info)))
7710 err = md_add_new_disk(mddev, &info);
7714 case CLUSTERED_DISK_NACK:
7715 if (mddev_is_clustered(mddev))
7716 md_cluster_ops->new_disk_ack(mddev, false);
7722 err = hot_add_disk(mddev, new_decode_dev(arg));
7726 err = do_md_run(mddev);
7729 case SET_BITMAP_FILE:
7730 err = set_bitmap_file(mddev, (int)arg);
7739 if (mddev->hold_active == UNTIL_IOCTL &&
7741 mddev->hold_active = 0;
7742 mddev_unlock(mddev);
7744 if(did_set_md_closing)
7745 clear_bit(MD_CLOSING, &mddev->flags);
7748 #ifdef CONFIG_COMPAT
7749 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7750 unsigned int cmd, unsigned long arg)
7753 case HOT_REMOVE_DISK:
7755 case SET_DISK_FAULTY:
7756 case SET_BITMAP_FILE:
7757 /* These take in integer arg, do not convert */
7760 arg = (unsigned long)compat_ptr(arg);
7764 return md_ioctl(bdev, mode, cmd, arg);
7766 #endif /* CONFIG_COMPAT */
7768 static int md_set_read_only(struct block_device *bdev, bool ro)
7770 struct mddev *mddev = bdev->bd_disk->private_data;
7773 err = mddev_lock(mddev);
7777 if (!mddev->raid_disks && !mddev->external) {
7783 * Transitioning to read-auto need only happen for arrays that call
7784 * md_write_start and which are not ready for writes yet.
7786 if (!ro && mddev->ro == 1 && mddev->pers) {
7787 err = restart_array(mddev);
7794 mddev_unlock(mddev);
7798 static int md_open(struct block_device *bdev, fmode_t mode)
7801 * Succeed if we can lock the mddev, which confirms that
7802 * it isn't being stopped right now.
7804 struct mddev *mddev = mddev_find(bdev->bd_dev);
7810 if (mddev->gendisk != bdev->bd_disk) {
7811 /* we are racing with mddev_put which is discarding this
7815 /* Wait until bdev->bd_disk is definitely gone */
7816 if (work_pending(&mddev->del_work))
7817 flush_workqueue(md_misc_wq);
7820 BUG_ON(mddev != bdev->bd_disk->private_data);
7822 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7825 if (test_bit(MD_CLOSING, &mddev->flags)) {
7826 mutex_unlock(&mddev->open_mutex);
7832 atomic_inc(&mddev->openers);
7833 mutex_unlock(&mddev->open_mutex);
7835 bdev_check_media_change(bdev);
7842 static void md_release(struct gendisk *disk, fmode_t mode)
7844 struct mddev *mddev = disk->private_data;
7847 atomic_dec(&mddev->openers);
7851 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7853 struct mddev *mddev = disk->private_data;
7854 unsigned int ret = 0;
7857 ret = DISK_EVENT_MEDIA_CHANGE;
7862 const struct block_device_operations md_fops =
7864 .owner = THIS_MODULE,
7865 .submit_bio = md_submit_bio,
7867 .release = md_release,
7869 #ifdef CONFIG_COMPAT
7870 .compat_ioctl = md_compat_ioctl,
7872 .getgeo = md_getgeo,
7873 .check_events = md_check_events,
7874 .set_read_only = md_set_read_only,
7877 static int md_thread(void *arg)
7879 struct md_thread *thread = arg;
7882 * md_thread is a 'system-thread', it's priority should be very
7883 * high. We avoid resource deadlocks individually in each
7884 * raid personality. (RAID5 does preallocation) We also use RR and
7885 * the very same RT priority as kswapd, thus we will never get
7886 * into a priority inversion deadlock.
7888 * we definitely have to have equal or higher priority than
7889 * bdflush, otherwise bdflush will deadlock if there are too
7890 * many dirty RAID5 blocks.
7893 allow_signal(SIGKILL);
7894 while (!kthread_should_stop()) {
7896 /* We need to wait INTERRUPTIBLE so that
7897 * we don't add to the load-average.
7898 * That means we need to be sure no signals are
7901 if (signal_pending(current))
7902 flush_signals(current);
7904 wait_event_interruptible_timeout
7906 test_bit(THREAD_WAKEUP, &thread->flags)
7907 || kthread_should_stop() || kthread_should_park(),
7910 clear_bit(THREAD_WAKEUP, &thread->flags);
7911 if (kthread_should_park())
7913 if (!kthread_should_stop())
7914 thread->run(thread);
7920 void md_wakeup_thread(struct md_thread *thread)
7923 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7924 set_bit(THREAD_WAKEUP, &thread->flags);
7925 wake_up(&thread->wqueue);
7928 EXPORT_SYMBOL(md_wakeup_thread);
7930 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7931 struct mddev *mddev, const char *name)
7933 struct md_thread *thread;
7935 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7939 init_waitqueue_head(&thread->wqueue);
7942 thread->mddev = mddev;
7943 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7944 thread->tsk = kthread_run(md_thread, thread,
7946 mdname(thread->mddev),
7948 if (IS_ERR(thread->tsk)) {
7954 EXPORT_SYMBOL(md_register_thread);
7956 void md_unregister_thread(struct md_thread **threadp)
7958 struct md_thread *thread = *threadp;
7961 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7962 /* Locking ensures that mddev_unlock does not wake_up a
7963 * non-existent thread
7965 spin_lock(&pers_lock);
7967 spin_unlock(&pers_lock);
7969 kthread_stop(thread->tsk);
7972 EXPORT_SYMBOL(md_unregister_thread);
7974 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7976 if (!rdev || test_bit(Faulty, &rdev->flags))
7979 if (!mddev->pers || !mddev->pers->error_handler)
7981 mddev->pers->error_handler(mddev,rdev);
7982 if (mddev->degraded)
7983 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7984 sysfs_notify_dirent_safe(rdev->sysfs_state);
7985 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7986 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7987 md_wakeup_thread(mddev->thread);
7988 if (mddev->event_work.func)
7989 queue_work(md_misc_wq, &mddev->event_work);
7992 EXPORT_SYMBOL(md_error);
7994 /* seq_file implementation /proc/mdstat */
7996 static void status_unused(struct seq_file *seq)
7999 struct md_rdev *rdev;
8001 seq_printf(seq, "unused devices: ");
8003 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8004 char b[BDEVNAME_SIZE];
8006 seq_printf(seq, "%s ",
8007 bdevname(rdev->bdev,b));
8010 seq_printf(seq, "<none>");
8012 seq_printf(seq, "\n");
8015 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8017 sector_t max_sectors, resync, res;
8018 unsigned long dt, db = 0;
8019 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8020 int scale, recovery_active;
8021 unsigned int per_milli;
8023 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8024 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8025 max_sectors = mddev->resync_max_sectors;
8027 max_sectors = mddev->dev_sectors;
8029 resync = mddev->curr_resync;
8031 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8032 /* Still cleaning up */
8033 resync = max_sectors;
8034 } else if (resync > max_sectors)
8035 resync = max_sectors;
8037 resync -= atomic_read(&mddev->recovery_active);
8040 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8041 struct md_rdev *rdev;
8043 rdev_for_each(rdev, mddev)
8044 if (rdev->raid_disk >= 0 &&
8045 !test_bit(Faulty, &rdev->flags) &&
8046 rdev->recovery_offset != MaxSector &&
8047 rdev->recovery_offset) {
8048 seq_printf(seq, "\trecover=REMOTE");
8051 if (mddev->reshape_position != MaxSector)
8052 seq_printf(seq, "\treshape=REMOTE");
8054 seq_printf(seq, "\tresync=REMOTE");
8057 if (mddev->recovery_cp < MaxSector) {
8058 seq_printf(seq, "\tresync=PENDING");
8064 seq_printf(seq, "\tresync=DELAYED");
8068 WARN_ON(max_sectors == 0);
8069 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8070 * in a sector_t, and (max_sectors>>scale) will fit in a
8071 * u32, as those are the requirements for sector_div.
8072 * Thus 'scale' must be at least 10
8075 if (sizeof(sector_t) > sizeof(unsigned long)) {
8076 while ( max_sectors/2 > (1ULL<<(scale+32)))
8079 res = (resync>>scale)*1000;
8080 sector_div(res, (u32)((max_sectors>>scale)+1));
8084 int i, x = per_milli/50, y = 20-x;
8085 seq_printf(seq, "[");
8086 for (i = 0; i < x; i++)
8087 seq_printf(seq, "=");
8088 seq_printf(seq, ">");
8089 for (i = 0; i < y; i++)
8090 seq_printf(seq, ".");
8091 seq_printf(seq, "] ");
8093 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8094 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8096 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8098 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8099 "resync" : "recovery"))),
8100 per_milli/10, per_milli % 10,
8101 (unsigned long long) resync/2,
8102 (unsigned long long) max_sectors/2);
8105 * dt: time from mark until now
8106 * db: blocks written from mark until now
8107 * rt: remaining time
8109 * rt is a sector_t, which is always 64bit now. We are keeping
8110 * the original algorithm, but it is not really necessary.
8112 * Original algorithm:
8113 * So we divide before multiply in case it is 32bit and close
8115 * We scale the divisor (db) by 32 to avoid losing precision
8116 * near the end of resync when the number of remaining sectors
8118 * We then divide rt by 32 after multiplying by db to compensate.
8119 * The '+1' avoids division by zero if db is very small.
8121 dt = ((jiffies - mddev->resync_mark) / HZ);
8124 curr_mark_cnt = mddev->curr_mark_cnt;
8125 recovery_active = atomic_read(&mddev->recovery_active);
8126 resync_mark_cnt = mddev->resync_mark_cnt;
8128 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8129 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8131 rt = max_sectors - resync; /* number of remaining sectors */
8132 rt = div64_u64(rt, db/32+1);
8136 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8137 ((unsigned long)rt % 60)/6);
8139 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8143 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8145 struct list_head *tmp;
8147 struct mddev *mddev;
8159 spin_lock(&all_mddevs_lock);
8160 list_for_each(tmp,&all_mddevs)
8162 mddev = list_entry(tmp, struct mddev, all_mddevs);
8164 spin_unlock(&all_mddevs_lock);
8167 spin_unlock(&all_mddevs_lock);
8169 return (void*)2;/* tail */
8173 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8175 struct list_head *tmp;
8176 struct mddev *next_mddev, *mddev = v;
8182 spin_lock(&all_mddevs_lock);
8184 tmp = all_mddevs.next;
8186 tmp = mddev->all_mddevs.next;
8187 if (tmp != &all_mddevs)
8188 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8190 next_mddev = (void*)2;
8193 spin_unlock(&all_mddevs_lock);
8201 static void md_seq_stop(struct seq_file *seq, void *v)
8203 struct mddev *mddev = v;
8205 if (mddev && v != (void*)1 && v != (void*)2)
8209 static int md_seq_show(struct seq_file *seq, void *v)
8211 struct mddev *mddev = v;
8213 struct md_rdev *rdev;
8215 if (v == (void*)1) {
8216 struct md_personality *pers;
8217 seq_printf(seq, "Personalities : ");
8218 spin_lock(&pers_lock);
8219 list_for_each_entry(pers, &pers_list, list)
8220 seq_printf(seq, "[%s] ", pers->name);
8222 spin_unlock(&pers_lock);
8223 seq_printf(seq, "\n");
8224 seq->poll_event = atomic_read(&md_event_count);
8227 if (v == (void*)2) {
8232 spin_lock(&mddev->lock);
8233 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8234 seq_printf(seq, "%s : %sactive", mdname(mddev),
8235 mddev->pers ? "" : "in");
8238 seq_printf(seq, " (read-only)");
8240 seq_printf(seq, " (auto-read-only)");
8241 seq_printf(seq, " %s", mddev->pers->name);
8246 rdev_for_each_rcu(rdev, mddev) {
8247 char b[BDEVNAME_SIZE];
8248 seq_printf(seq, " %s[%d]",
8249 bdevname(rdev->bdev,b), rdev->desc_nr);
8250 if (test_bit(WriteMostly, &rdev->flags))
8251 seq_printf(seq, "(W)");
8252 if (test_bit(Journal, &rdev->flags))
8253 seq_printf(seq, "(J)");
8254 if (test_bit(Faulty, &rdev->flags)) {
8255 seq_printf(seq, "(F)");
8258 if (rdev->raid_disk < 0)
8259 seq_printf(seq, "(S)"); /* spare */
8260 if (test_bit(Replacement, &rdev->flags))
8261 seq_printf(seq, "(R)");
8262 sectors += rdev->sectors;
8266 if (!list_empty(&mddev->disks)) {
8268 seq_printf(seq, "\n %llu blocks",
8269 (unsigned long long)
8270 mddev->array_sectors / 2);
8272 seq_printf(seq, "\n %llu blocks",
8273 (unsigned long long)sectors / 2);
8275 if (mddev->persistent) {
8276 if (mddev->major_version != 0 ||
8277 mddev->minor_version != 90) {
8278 seq_printf(seq," super %d.%d",
8279 mddev->major_version,
8280 mddev->minor_version);
8282 } else if (mddev->external)
8283 seq_printf(seq, " super external:%s",
8284 mddev->metadata_type);
8286 seq_printf(seq, " super non-persistent");
8289 mddev->pers->status(seq, mddev);
8290 seq_printf(seq, "\n ");
8291 if (mddev->pers->sync_request) {
8292 if (status_resync(seq, mddev))
8293 seq_printf(seq, "\n ");
8296 seq_printf(seq, "\n ");
8298 md_bitmap_status(seq, mddev->bitmap);
8300 seq_printf(seq, "\n");
8302 spin_unlock(&mddev->lock);
8307 static const struct seq_operations md_seq_ops = {
8308 .start = md_seq_start,
8309 .next = md_seq_next,
8310 .stop = md_seq_stop,
8311 .show = md_seq_show,
8314 static int md_seq_open(struct inode *inode, struct file *file)
8316 struct seq_file *seq;
8319 error = seq_open(file, &md_seq_ops);
8323 seq = file->private_data;
8324 seq->poll_event = atomic_read(&md_event_count);
8328 static int md_unloading;
8329 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8331 struct seq_file *seq = filp->private_data;
8335 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8336 poll_wait(filp, &md_event_waiters, wait);
8338 /* always allow read */
8339 mask = EPOLLIN | EPOLLRDNORM;
8341 if (seq->poll_event != atomic_read(&md_event_count))
8342 mask |= EPOLLERR | EPOLLPRI;
8346 static const struct proc_ops mdstat_proc_ops = {
8347 .proc_open = md_seq_open,
8348 .proc_read = seq_read,
8349 .proc_lseek = seq_lseek,
8350 .proc_release = seq_release,
8351 .proc_poll = mdstat_poll,
8354 int register_md_personality(struct md_personality *p)
8356 pr_debug("md: %s personality registered for level %d\n",
8358 spin_lock(&pers_lock);
8359 list_add_tail(&p->list, &pers_list);
8360 spin_unlock(&pers_lock);
8363 EXPORT_SYMBOL(register_md_personality);
8365 int unregister_md_personality(struct md_personality *p)
8367 pr_debug("md: %s personality unregistered\n", p->name);
8368 spin_lock(&pers_lock);
8369 list_del_init(&p->list);
8370 spin_unlock(&pers_lock);
8373 EXPORT_SYMBOL(unregister_md_personality);
8375 int register_md_cluster_operations(struct md_cluster_operations *ops,
8376 struct module *module)
8379 spin_lock(&pers_lock);
8380 if (md_cluster_ops != NULL)
8383 md_cluster_ops = ops;
8384 md_cluster_mod = module;
8386 spin_unlock(&pers_lock);
8389 EXPORT_SYMBOL(register_md_cluster_operations);
8391 int unregister_md_cluster_operations(void)
8393 spin_lock(&pers_lock);
8394 md_cluster_ops = NULL;
8395 spin_unlock(&pers_lock);
8398 EXPORT_SYMBOL(unregister_md_cluster_operations);
8400 int md_setup_cluster(struct mddev *mddev, int nodes)
8403 if (!md_cluster_ops)
8404 request_module("md-cluster");
8405 spin_lock(&pers_lock);
8406 /* ensure module won't be unloaded */
8407 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8408 pr_warn("can't find md-cluster module or get it's reference.\n");
8409 spin_unlock(&pers_lock);
8412 spin_unlock(&pers_lock);
8414 ret = md_cluster_ops->join(mddev, nodes);
8416 mddev->safemode_delay = 0;
8420 void md_cluster_stop(struct mddev *mddev)
8422 if (!md_cluster_ops)
8424 md_cluster_ops->leave(mddev);
8425 module_put(md_cluster_mod);
8428 static int is_mddev_idle(struct mddev *mddev, int init)
8430 struct md_rdev *rdev;
8436 rdev_for_each_rcu(rdev, mddev) {
8437 struct gendisk *disk = rdev->bdev->bd_disk;
8438 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8439 atomic_read(&disk->sync_io);
8440 /* sync IO will cause sync_io to increase before the disk_stats
8441 * as sync_io is counted when a request starts, and
8442 * disk_stats is counted when it completes.
8443 * So resync activity will cause curr_events to be smaller than
8444 * when there was no such activity.
8445 * non-sync IO will cause disk_stat to increase without
8446 * increasing sync_io so curr_events will (eventually)
8447 * be larger than it was before. Once it becomes
8448 * substantially larger, the test below will cause
8449 * the array to appear non-idle, and resync will slow
8451 * If there is a lot of outstanding resync activity when
8452 * we set last_event to curr_events, then all that activity
8453 * completing might cause the array to appear non-idle
8454 * and resync will be slowed down even though there might
8455 * not have been non-resync activity. This will only
8456 * happen once though. 'last_events' will soon reflect
8457 * the state where there is little or no outstanding
8458 * resync requests, and further resync activity will
8459 * always make curr_events less than last_events.
8462 if (init || curr_events - rdev->last_events > 64) {
8463 rdev->last_events = curr_events;
8471 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8473 /* another "blocks" (512byte) blocks have been synced */
8474 atomic_sub(blocks, &mddev->recovery_active);
8475 wake_up(&mddev->recovery_wait);
8477 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8478 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8479 md_wakeup_thread(mddev->thread);
8480 // stop recovery, signal do_sync ....
8483 EXPORT_SYMBOL(md_done_sync);
8485 /* md_write_start(mddev, bi)
8486 * If we need to update some array metadata (e.g. 'active' flag
8487 * in superblock) before writing, schedule a superblock update
8488 * and wait for it to complete.
8489 * A return value of 'false' means that the write wasn't recorded
8490 * and cannot proceed as the array is being suspend.
8492 bool md_write_start(struct mddev *mddev, struct bio *bi)
8496 if (bio_data_dir(bi) != WRITE)
8499 BUG_ON(mddev->ro == 1);
8500 if (mddev->ro == 2) {
8501 /* need to switch to read/write */
8503 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8504 md_wakeup_thread(mddev->thread);
8505 md_wakeup_thread(mddev->sync_thread);
8509 percpu_ref_get(&mddev->writes_pending);
8510 smp_mb(); /* Match smp_mb in set_in_sync() */
8511 if (mddev->safemode == 1)
8512 mddev->safemode = 0;
8513 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8514 if (mddev->in_sync || mddev->sync_checkers) {
8515 spin_lock(&mddev->lock);
8516 if (mddev->in_sync) {
8518 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8519 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8520 md_wakeup_thread(mddev->thread);
8523 spin_unlock(&mddev->lock);
8527 sysfs_notify_dirent_safe(mddev->sysfs_state);
8528 if (!mddev->has_superblocks)
8530 wait_event(mddev->sb_wait,
8531 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8533 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8534 percpu_ref_put(&mddev->writes_pending);
8539 EXPORT_SYMBOL(md_write_start);
8541 /* md_write_inc can only be called when md_write_start() has
8542 * already been called at least once of the current request.
8543 * It increments the counter and is useful when a single request
8544 * is split into several parts. Each part causes an increment and
8545 * so needs a matching md_write_end().
8546 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8547 * a spinlocked region.
8549 void md_write_inc(struct mddev *mddev, struct bio *bi)
8551 if (bio_data_dir(bi) != WRITE)
8553 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8554 percpu_ref_get(&mddev->writes_pending);
8556 EXPORT_SYMBOL(md_write_inc);
8558 void md_write_end(struct mddev *mddev)
8560 percpu_ref_put(&mddev->writes_pending);
8562 if (mddev->safemode == 2)
8563 md_wakeup_thread(mddev->thread);
8564 else if (mddev->safemode_delay)
8565 /* The roundup() ensures this only performs locking once
8566 * every ->safemode_delay jiffies
8568 mod_timer(&mddev->safemode_timer,
8569 roundup(jiffies, mddev->safemode_delay) +
8570 mddev->safemode_delay);
8573 EXPORT_SYMBOL(md_write_end);
8575 /* This is used by raid0 and raid10 */
8576 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8577 struct bio *bio, sector_t start, sector_t size)
8579 struct bio *discard_bio = NULL;
8581 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO, 0,
8582 &discard_bio) || !discard_bio)
8585 bio_chain(discard_bio, bio);
8586 bio_clone_blkg_association(discard_bio, bio);
8588 trace_block_bio_remap(discard_bio,
8589 disk_devt(mddev->gendisk),
8590 bio->bi_iter.bi_sector);
8591 submit_bio_noacct(discard_bio);
8593 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8595 static void md_end_io_acct(struct bio *bio)
8597 struct md_io_acct *md_io_acct = bio->bi_private;
8598 struct bio *orig_bio = md_io_acct->orig_bio;
8600 orig_bio->bi_status = bio->bi_status;
8602 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8604 bio_endio(orig_bio);
8608 * Used by personalities that don't already clone the bio and thus can't
8609 * easily add the timestamp to their extended bio structure.
8611 void md_account_bio(struct mddev *mddev, struct bio **bio)
8613 struct md_io_acct *md_io_acct;
8616 if (!blk_queue_io_stat((*bio)->bi_bdev->bd_disk->queue))
8619 clone = bio_clone_fast(*bio, GFP_NOIO, &mddev->io_acct_set);
8620 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8621 md_io_acct->orig_bio = *bio;
8622 md_io_acct->start_time = bio_start_io_acct(*bio);
8624 clone->bi_end_io = md_end_io_acct;
8625 clone->bi_private = md_io_acct;
8628 EXPORT_SYMBOL_GPL(md_account_bio);
8630 /* md_allow_write(mddev)
8631 * Calling this ensures that the array is marked 'active' so that writes
8632 * may proceed without blocking. It is important to call this before
8633 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8634 * Must be called with mddev_lock held.
8636 void md_allow_write(struct mddev *mddev)
8642 if (!mddev->pers->sync_request)
8645 spin_lock(&mddev->lock);
8646 if (mddev->in_sync) {
8648 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8649 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8650 if (mddev->safemode_delay &&
8651 mddev->safemode == 0)
8652 mddev->safemode = 1;
8653 spin_unlock(&mddev->lock);
8654 md_update_sb(mddev, 0);
8655 sysfs_notify_dirent_safe(mddev->sysfs_state);
8656 /* wait for the dirty state to be recorded in the metadata */
8657 wait_event(mddev->sb_wait,
8658 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8660 spin_unlock(&mddev->lock);
8662 EXPORT_SYMBOL_GPL(md_allow_write);
8664 #define SYNC_MARKS 10
8665 #define SYNC_MARK_STEP (3*HZ)
8666 #define UPDATE_FREQUENCY (5*60*HZ)
8667 void md_do_sync(struct md_thread *thread)
8669 struct mddev *mddev = thread->mddev;
8670 struct mddev *mddev2;
8671 unsigned int currspeed = 0, window;
8672 sector_t max_sectors,j, io_sectors, recovery_done;
8673 unsigned long mark[SYNC_MARKS];
8674 unsigned long update_time;
8675 sector_t mark_cnt[SYNC_MARKS];
8677 struct list_head *tmp;
8678 sector_t last_check;
8680 struct md_rdev *rdev;
8681 char *desc, *action = NULL;
8682 struct blk_plug plug;
8685 /* just incase thread restarts... */
8686 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8687 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8689 if (mddev->ro) {/* never try to sync a read-only array */
8690 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8694 if (mddev_is_clustered(mddev)) {
8695 ret = md_cluster_ops->resync_start(mddev);
8699 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8700 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8701 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8702 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8703 && ((unsigned long long)mddev->curr_resync_completed
8704 < (unsigned long long)mddev->resync_max_sectors))
8708 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8709 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8710 desc = "data-check";
8712 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8713 desc = "requested-resync";
8717 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8722 mddev->last_sync_action = action ?: desc;
8724 /* we overload curr_resync somewhat here.
8725 * 0 == not engaged in resync at all
8726 * 2 == checking that there is no conflict with another sync
8727 * 1 == like 2, but have yielded to allow conflicting resync to
8729 * other == active in resync - this many blocks
8731 * Before starting a resync we must have set curr_resync to
8732 * 2, and then checked that every "conflicting" array has curr_resync
8733 * less than ours. When we find one that is the same or higher
8734 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8735 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8736 * This will mean we have to start checking from the beginning again.
8741 int mddev2_minor = -1;
8742 mddev->curr_resync = 2;
8745 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8747 for_each_mddev(mddev2, tmp) {
8748 if (mddev2 == mddev)
8750 if (!mddev->parallel_resync
8751 && mddev2->curr_resync
8752 && match_mddev_units(mddev, mddev2)) {
8754 if (mddev < mddev2 && mddev->curr_resync == 2) {
8755 /* arbitrarily yield */
8756 mddev->curr_resync = 1;
8757 wake_up(&resync_wait);
8759 if (mddev > mddev2 && mddev->curr_resync == 1)
8760 /* no need to wait here, we can wait the next
8761 * time 'round when curr_resync == 2
8764 /* We need to wait 'interruptible' so as not to
8765 * contribute to the load average, and not to
8766 * be caught by 'softlockup'
8768 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8769 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8770 mddev2->curr_resync >= mddev->curr_resync) {
8771 if (mddev2_minor != mddev2->md_minor) {
8772 mddev2_minor = mddev2->md_minor;
8773 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8774 desc, mdname(mddev),
8778 if (signal_pending(current))
8779 flush_signals(current);
8781 finish_wait(&resync_wait, &wq);
8784 finish_wait(&resync_wait, &wq);
8787 } while (mddev->curr_resync < 2);
8790 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8791 /* resync follows the size requested by the personality,
8792 * which defaults to physical size, but can be virtual size
8794 max_sectors = mddev->resync_max_sectors;
8795 atomic64_set(&mddev->resync_mismatches, 0);
8796 /* we don't use the checkpoint if there's a bitmap */
8797 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8798 j = mddev->resync_min;
8799 else if (!mddev->bitmap)
8800 j = mddev->recovery_cp;
8802 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8803 max_sectors = mddev->resync_max_sectors;
8805 * If the original node aborts reshaping then we continue the
8806 * reshaping, so set j again to avoid restart reshape from the
8809 if (mddev_is_clustered(mddev) &&
8810 mddev->reshape_position != MaxSector)
8811 j = mddev->reshape_position;
8813 /* recovery follows the physical size of devices */
8814 max_sectors = mddev->dev_sectors;
8817 rdev_for_each_rcu(rdev, mddev)
8818 if (rdev->raid_disk >= 0 &&
8819 !test_bit(Journal, &rdev->flags) &&
8820 !test_bit(Faulty, &rdev->flags) &&
8821 !test_bit(In_sync, &rdev->flags) &&
8822 rdev->recovery_offset < j)
8823 j = rdev->recovery_offset;
8826 /* If there is a bitmap, we need to make sure all
8827 * writes that started before we added a spare
8828 * complete before we start doing a recovery.
8829 * Otherwise the write might complete and (via
8830 * bitmap_endwrite) set a bit in the bitmap after the
8831 * recovery has checked that bit and skipped that
8834 if (mddev->bitmap) {
8835 mddev->pers->quiesce(mddev, 1);
8836 mddev->pers->quiesce(mddev, 0);
8840 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8841 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8842 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8843 speed_max(mddev), desc);
8845 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8848 for (m = 0; m < SYNC_MARKS; m++) {
8850 mark_cnt[m] = io_sectors;
8853 mddev->resync_mark = mark[last_mark];
8854 mddev->resync_mark_cnt = mark_cnt[last_mark];
8857 * Tune reconstruction:
8859 window = 32 * (PAGE_SIZE / 512);
8860 pr_debug("md: using %dk window, over a total of %lluk.\n",
8861 window/2, (unsigned long long)max_sectors/2);
8863 atomic_set(&mddev->recovery_active, 0);
8867 pr_debug("md: resuming %s of %s from checkpoint.\n",
8868 desc, mdname(mddev));
8869 mddev->curr_resync = j;
8871 mddev->curr_resync = 3; /* no longer delayed */
8872 mddev->curr_resync_completed = j;
8873 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8875 update_time = jiffies;
8877 blk_start_plug(&plug);
8878 while (j < max_sectors) {
8883 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8884 ((mddev->curr_resync > mddev->curr_resync_completed &&
8885 (mddev->curr_resync - mddev->curr_resync_completed)
8886 > (max_sectors >> 4)) ||
8887 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8888 (j - mddev->curr_resync_completed)*2
8889 >= mddev->resync_max - mddev->curr_resync_completed ||
8890 mddev->curr_resync_completed > mddev->resync_max
8892 /* time to update curr_resync_completed */
8893 wait_event(mddev->recovery_wait,
8894 atomic_read(&mddev->recovery_active) == 0);
8895 mddev->curr_resync_completed = j;
8896 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8897 j > mddev->recovery_cp)
8898 mddev->recovery_cp = j;
8899 update_time = jiffies;
8900 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8901 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8904 while (j >= mddev->resync_max &&
8905 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8906 /* As this condition is controlled by user-space,
8907 * we can block indefinitely, so use '_interruptible'
8908 * to avoid triggering warnings.
8910 flush_signals(current); /* just in case */
8911 wait_event_interruptible(mddev->recovery_wait,
8912 mddev->resync_max > j
8913 || test_bit(MD_RECOVERY_INTR,
8917 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8920 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8922 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8926 if (!skipped) { /* actual IO requested */
8927 io_sectors += sectors;
8928 atomic_add(sectors, &mddev->recovery_active);
8931 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8935 if (j > max_sectors)
8936 /* when skipping, extra large numbers can be returned. */
8939 mddev->curr_resync = j;
8940 mddev->curr_mark_cnt = io_sectors;
8941 if (last_check == 0)
8942 /* this is the earliest that rebuild will be
8943 * visible in /proc/mdstat
8947 if (last_check + window > io_sectors || j == max_sectors)
8950 last_check = io_sectors;
8952 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8954 int next = (last_mark+1) % SYNC_MARKS;
8956 mddev->resync_mark = mark[next];
8957 mddev->resync_mark_cnt = mark_cnt[next];
8958 mark[next] = jiffies;
8959 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8963 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8967 * this loop exits only if either when we are slower than
8968 * the 'hard' speed limit, or the system was IO-idle for
8970 * the system might be non-idle CPU-wise, but we only care
8971 * about not overloading the IO subsystem. (things like an
8972 * e2fsck being done on the RAID array should execute fast)
8976 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8977 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8978 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8980 if (currspeed > speed_min(mddev)) {
8981 if (currspeed > speed_max(mddev)) {
8985 if (!is_mddev_idle(mddev, 0)) {
8987 * Give other IO more of a chance.
8988 * The faster the devices, the less we wait.
8990 wait_event(mddev->recovery_wait,
8991 !atomic_read(&mddev->recovery_active));
8995 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8996 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8997 ? "interrupted" : "done");
8999 * this also signals 'finished resyncing' to md_stop
9001 blk_finish_plug(&plug);
9002 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9004 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9005 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9006 mddev->curr_resync > 3) {
9007 mddev->curr_resync_completed = mddev->curr_resync;
9008 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9010 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9012 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9013 mddev->curr_resync > 3) {
9014 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9015 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9016 if (mddev->curr_resync >= mddev->recovery_cp) {
9017 pr_debug("md: checkpointing %s of %s.\n",
9018 desc, mdname(mddev));
9019 if (test_bit(MD_RECOVERY_ERROR,
9021 mddev->recovery_cp =
9022 mddev->curr_resync_completed;
9024 mddev->recovery_cp =
9028 mddev->recovery_cp = MaxSector;
9030 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9031 mddev->curr_resync = MaxSector;
9032 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9033 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9035 rdev_for_each_rcu(rdev, mddev)
9036 if (rdev->raid_disk >= 0 &&
9037 mddev->delta_disks >= 0 &&
9038 !test_bit(Journal, &rdev->flags) &&
9039 !test_bit(Faulty, &rdev->flags) &&
9040 !test_bit(In_sync, &rdev->flags) &&
9041 rdev->recovery_offset < mddev->curr_resync)
9042 rdev->recovery_offset = mddev->curr_resync;
9048 /* set CHANGE_PENDING here since maybe another update is needed,
9049 * so other nodes are informed. It should be harmless for normal
9051 set_mask_bits(&mddev->sb_flags, 0,
9052 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9054 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9055 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9056 mddev->delta_disks > 0 &&
9057 mddev->pers->finish_reshape &&
9058 mddev->pers->size &&
9060 mddev_lock_nointr(mddev);
9061 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9062 mddev_unlock(mddev);
9063 if (!mddev_is_clustered(mddev))
9064 set_capacity_and_notify(mddev->gendisk,
9065 mddev->array_sectors);
9068 spin_lock(&mddev->lock);
9069 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9070 /* We completed so min/max setting can be forgotten if used. */
9071 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9072 mddev->resync_min = 0;
9073 mddev->resync_max = MaxSector;
9074 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9075 mddev->resync_min = mddev->curr_resync_completed;
9076 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9077 mddev->curr_resync = 0;
9078 spin_unlock(&mddev->lock);
9080 wake_up(&resync_wait);
9081 md_wakeup_thread(mddev->thread);
9084 EXPORT_SYMBOL_GPL(md_do_sync);
9086 static int remove_and_add_spares(struct mddev *mddev,
9087 struct md_rdev *this)
9089 struct md_rdev *rdev;
9092 bool remove_some = false;
9094 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9095 /* Mustn't remove devices when resync thread is running */
9098 rdev_for_each(rdev, mddev) {
9099 if ((this == NULL || rdev == this) &&
9100 rdev->raid_disk >= 0 &&
9101 !test_bit(Blocked, &rdev->flags) &&
9102 test_bit(Faulty, &rdev->flags) &&
9103 atomic_read(&rdev->nr_pending)==0) {
9104 /* Faulty non-Blocked devices with nr_pending == 0
9105 * never get nr_pending incremented,
9106 * never get Faulty cleared, and never get Blocked set.
9107 * So we can synchronize_rcu now rather than once per device
9110 set_bit(RemoveSynchronized, &rdev->flags);
9116 rdev_for_each(rdev, mddev) {
9117 if ((this == NULL || rdev == this) &&
9118 rdev->raid_disk >= 0 &&
9119 !test_bit(Blocked, &rdev->flags) &&
9120 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9121 (!test_bit(In_sync, &rdev->flags) &&
9122 !test_bit(Journal, &rdev->flags))) &&
9123 atomic_read(&rdev->nr_pending)==0)) {
9124 if (mddev->pers->hot_remove_disk(
9125 mddev, rdev) == 0) {
9126 sysfs_unlink_rdev(mddev, rdev);
9127 rdev->saved_raid_disk = rdev->raid_disk;
9128 rdev->raid_disk = -1;
9132 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9133 clear_bit(RemoveSynchronized, &rdev->flags);
9136 if (removed && mddev->kobj.sd)
9137 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9139 if (this && removed)
9142 rdev_for_each(rdev, mddev) {
9143 if (this && this != rdev)
9145 if (test_bit(Candidate, &rdev->flags))
9147 if (rdev->raid_disk >= 0 &&
9148 !test_bit(In_sync, &rdev->flags) &&
9149 !test_bit(Journal, &rdev->flags) &&
9150 !test_bit(Faulty, &rdev->flags))
9152 if (rdev->raid_disk >= 0)
9154 if (test_bit(Faulty, &rdev->flags))
9156 if (!test_bit(Journal, &rdev->flags)) {
9158 ! (rdev->saved_raid_disk >= 0 &&
9159 !test_bit(Bitmap_sync, &rdev->flags)))
9162 rdev->recovery_offset = 0;
9164 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9165 /* failure here is OK */
9166 sysfs_link_rdev(mddev, rdev);
9167 if (!test_bit(Journal, &rdev->flags))
9170 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9175 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9179 static void md_start_sync(struct work_struct *ws)
9181 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9183 mddev->sync_thread = md_register_thread(md_do_sync,
9186 if (!mddev->sync_thread) {
9187 pr_warn("%s: could not start resync thread...\n",
9189 /* leave the spares where they are, it shouldn't hurt */
9190 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9191 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9192 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9193 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9194 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9195 wake_up(&resync_wait);
9196 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9198 if (mddev->sysfs_action)
9199 sysfs_notify_dirent_safe(mddev->sysfs_action);
9201 md_wakeup_thread(mddev->sync_thread);
9202 sysfs_notify_dirent_safe(mddev->sysfs_action);
9207 * This routine is regularly called by all per-raid-array threads to
9208 * deal with generic issues like resync and super-block update.
9209 * Raid personalities that don't have a thread (linear/raid0) do not
9210 * need this as they never do any recovery or update the superblock.
9212 * It does not do any resync itself, but rather "forks" off other threads
9213 * to do that as needed.
9214 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9215 * "->recovery" and create a thread at ->sync_thread.
9216 * When the thread finishes it sets MD_RECOVERY_DONE
9217 * and wakeups up this thread which will reap the thread and finish up.
9218 * This thread also removes any faulty devices (with nr_pending == 0).
9220 * The overall approach is:
9221 * 1/ if the superblock needs updating, update it.
9222 * 2/ If a recovery thread is running, don't do anything else.
9223 * 3/ If recovery has finished, clean up, possibly marking spares active.
9224 * 4/ If there are any faulty devices, remove them.
9225 * 5/ If array is degraded, try to add spares devices
9226 * 6/ If array has spares or is not in-sync, start a resync thread.
9228 void md_check_recovery(struct mddev *mddev)
9230 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9231 /* Write superblock - thread that called mddev_suspend()
9232 * holds reconfig_mutex for us.
9234 set_bit(MD_UPDATING_SB, &mddev->flags);
9235 smp_mb__after_atomic();
9236 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9237 md_update_sb(mddev, 0);
9238 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9239 wake_up(&mddev->sb_wait);
9242 if (mddev->suspended)
9246 md_bitmap_daemon_work(mddev);
9248 if (signal_pending(current)) {
9249 if (mddev->pers->sync_request && !mddev->external) {
9250 pr_debug("md: %s in immediate safe mode\n",
9252 mddev->safemode = 2;
9254 flush_signals(current);
9257 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9260 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9261 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9262 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9263 (mddev->external == 0 && mddev->safemode == 1) ||
9264 (mddev->safemode == 2
9265 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9269 if (mddev_trylock(mddev)) {
9271 bool try_set_sync = mddev->safemode != 0;
9273 if (!mddev->external && mddev->safemode == 1)
9274 mddev->safemode = 0;
9277 struct md_rdev *rdev;
9278 if (!mddev->external && mddev->in_sync)
9279 /* 'Blocked' flag not needed as failed devices
9280 * will be recorded if array switched to read/write.
9281 * Leaving it set will prevent the device
9282 * from being removed.
9284 rdev_for_each(rdev, mddev)
9285 clear_bit(Blocked, &rdev->flags);
9286 /* On a read-only array we can:
9287 * - remove failed devices
9288 * - add already-in_sync devices if the array itself
9290 * As we only add devices that are already in-sync,
9291 * we can activate the spares immediately.
9293 remove_and_add_spares(mddev, NULL);
9294 /* There is no thread, but we need to call
9295 * ->spare_active and clear saved_raid_disk
9297 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9298 md_reap_sync_thread(mddev);
9299 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9300 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9301 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9305 if (mddev_is_clustered(mddev)) {
9306 struct md_rdev *rdev, *tmp;
9307 /* kick the device if another node issued a
9310 rdev_for_each_safe(rdev, tmp, mddev) {
9311 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9312 rdev->raid_disk < 0)
9313 md_kick_rdev_from_array(rdev);
9317 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9318 spin_lock(&mddev->lock);
9320 spin_unlock(&mddev->lock);
9323 if (mddev->sb_flags)
9324 md_update_sb(mddev, 0);
9326 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9327 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9328 /* resync/recovery still happening */
9329 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9332 if (mddev->sync_thread) {
9333 md_reap_sync_thread(mddev);
9336 /* Set RUNNING before clearing NEEDED to avoid
9337 * any transients in the value of "sync_action".
9339 mddev->curr_resync_completed = 0;
9340 spin_lock(&mddev->lock);
9341 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9342 spin_unlock(&mddev->lock);
9343 /* Clear some bits that don't mean anything, but
9346 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9347 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9349 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9350 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9352 /* no recovery is running.
9353 * remove any failed drives, then
9354 * add spares if possible.
9355 * Spares are also removed and re-added, to allow
9356 * the personality to fail the re-add.
9359 if (mddev->reshape_position != MaxSector) {
9360 if (mddev->pers->check_reshape == NULL ||
9361 mddev->pers->check_reshape(mddev) != 0)
9362 /* Cannot proceed */
9364 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9365 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9366 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9367 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9368 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9369 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9370 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9371 } else if (mddev->recovery_cp < MaxSector) {
9372 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9373 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9374 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9375 /* nothing to be done ... */
9378 if (mddev->pers->sync_request) {
9380 /* We are adding a device or devices to an array
9381 * which has the bitmap stored on all devices.
9382 * So make sure all bitmap pages get written
9384 md_bitmap_write_all(mddev->bitmap);
9386 INIT_WORK(&mddev->del_work, md_start_sync);
9387 queue_work(md_misc_wq, &mddev->del_work);
9391 if (!mddev->sync_thread) {
9392 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9393 wake_up(&resync_wait);
9394 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9396 if (mddev->sysfs_action)
9397 sysfs_notify_dirent_safe(mddev->sysfs_action);
9400 wake_up(&mddev->sb_wait);
9401 mddev_unlock(mddev);
9404 EXPORT_SYMBOL(md_check_recovery);
9406 void md_reap_sync_thread(struct mddev *mddev)
9408 struct md_rdev *rdev;
9409 sector_t old_dev_sectors = mddev->dev_sectors;
9410 bool is_reshaped = false;
9412 /* resync has finished, collect result */
9413 md_unregister_thread(&mddev->sync_thread);
9414 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9415 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9416 mddev->degraded != mddev->raid_disks) {
9418 /* activate any spares */
9419 if (mddev->pers->spare_active(mddev)) {
9420 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9421 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9424 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9425 mddev->pers->finish_reshape) {
9426 mddev->pers->finish_reshape(mddev);
9427 if (mddev_is_clustered(mddev))
9431 /* If array is no-longer degraded, then any saved_raid_disk
9432 * information must be scrapped.
9434 if (!mddev->degraded)
9435 rdev_for_each(rdev, mddev)
9436 rdev->saved_raid_disk = -1;
9438 md_update_sb(mddev, 1);
9439 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9440 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9442 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9443 md_cluster_ops->resync_finish(mddev);
9444 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9445 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9446 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9447 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9448 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9449 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9451 * We call md_cluster_ops->update_size here because sync_size could
9452 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9453 * so it is time to update size across cluster.
9455 if (mddev_is_clustered(mddev) && is_reshaped
9456 && !test_bit(MD_CLOSING, &mddev->flags))
9457 md_cluster_ops->update_size(mddev, old_dev_sectors);
9458 wake_up(&resync_wait);
9459 /* flag recovery needed just to double check */
9460 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9461 sysfs_notify_dirent_safe(mddev->sysfs_action);
9463 if (mddev->event_work.func)
9464 queue_work(md_misc_wq, &mddev->event_work);
9466 EXPORT_SYMBOL(md_reap_sync_thread);
9468 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9470 sysfs_notify_dirent_safe(rdev->sysfs_state);
9471 wait_event_timeout(rdev->blocked_wait,
9472 !test_bit(Blocked, &rdev->flags) &&
9473 !test_bit(BlockedBadBlocks, &rdev->flags),
9474 msecs_to_jiffies(5000));
9475 rdev_dec_pending(rdev, mddev);
9477 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9479 void md_finish_reshape(struct mddev *mddev)
9481 /* called be personality module when reshape completes. */
9482 struct md_rdev *rdev;
9484 rdev_for_each(rdev, mddev) {
9485 if (rdev->data_offset > rdev->new_data_offset)
9486 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9488 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9489 rdev->data_offset = rdev->new_data_offset;
9492 EXPORT_SYMBOL(md_finish_reshape);
9494 /* Bad block management */
9496 /* Returns 1 on success, 0 on failure */
9497 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9500 struct mddev *mddev = rdev->mddev;
9503 s += rdev->new_data_offset;
9505 s += rdev->data_offset;
9506 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9508 /* Make sure they get written out promptly */
9509 if (test_bit(ExternalBbl, &rdev->flags))
9510 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9511 sysfs_notify_dirent_safe(rdev->sysfs_state);
9512 set_mask_bits(&mddev->sb_flags, 0,
9513 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9514 md_wakeup_thread(rdev->mddev->thread);
9519 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9521 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9526 s += rdev->new_data_offset;
9528 s += rdev->data_offset;
9529 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9530 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9531 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9534 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9536 static int md_notify_reboot(struct notifier_block *this,
9537 unsigned long code, void *x)
9539 struct list_head *tmp;
9540 struct mddev *mddev;
9543 for_each_mddev(mddev, tmp) {
9544 if (mddev_trylock(mddev)) {
9546 __md_stop_writes(mddev);
9547 if (mddev->persistent)
9548 mddev->safemode = 2;
9549 mddev_unlock(mddev);
9554 * certain more exotic SCSI devices are known to be
9555 * volatile wrt too early system reboots. While the
9556 * right place to handle this issue is the given
9557 * driver, we do want to have a safe RAID driver ...
9565 static struct notifier_block md_notifier = {
9566 .notifier_call = md_notify_reboot,
9568 .priority = INT_MAX, /* before any real devices */
9571 static void md_geninit(void)
9573 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9575 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9578 static int __init md_init(void)
9582 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9586 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9590 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9591 if (!md_rdev_misc_wq)
9592 goto err_rdev_misc_wq;
9594 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9598 ret = __register_blkdev(0, "mdp", md_probe);
9603 register_reboot_notifier(&md_notifier);
9604 raid_table_header = register_sysctl_table(raid_root_table);
9610 unregister_blkdev(MD_MAJOR, "md");
9612 destroy_workqueue(md_rdev_misc_wq);
9614 destroy_workqueue(md_misc_wq);
9616 destroy_workqueue(md_wq);
9621 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9623 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9624 struct md_rdev *rdev2, *tmp;
9626 char b[BDEVNAME_SIZE];
9629 * If size is changed in another node then we need to
9630 * do resize as well.
9632 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9633 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9635 pr_info("md-cluster: resize failed\n");
9637 md_bitmap_update_sb(mddev->bitmap);
9640 /* Check for change of roles in the active devices */
9641 rdev_for_each_safe(rdev2, tmp, mddev) {
9642 if (test_bit(Faulty, &rdev2->flags))
9645 /* Check if the roles changed */
9646 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9648 if (test_bit(Candidate, &rdev2->flags)) {
9649 if (role == 0xfffe) {
9650 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9651 md_kick_rdev_from_array(rdev2);
9655 clear_bit(Candidate, &rdev2->flags);
9658 if (role != rdev2->raid_disk) {
9660 * got activated except reshape is happening.
9662 if (rdev2->raid_disk == -1 && role != 0xffff &&
9663 !(le32_to_cpu(sb->feature_map) &
9664 MD_FEATURE_RESHAPE_ACTIVE)) {
9665 rdev2->saved_raid_disk = role;
9666 ret = remove_and_add_spares(mddev, rdev2);
9667 pr_info("Activated spare: %s\n",
9668 bdevname(rdev2->bdev,b));
9669 /* wakeup mddev->thread here, so array could
9670 * perform resync with the new activated disk */
9671 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9672 md_wakeup_thread(mddev->thread);
9675 * We just want to do the minimum to mark the disk
9676 * as faulty. The recovery is performed by the
9677 * one who initiated the error.
9679 if ((role == 0xfffe) || (role == 0xfffd)) {
9680 md_error(mddev, rdev2);
9681 clear_bit(Blocked, &rdev2->flags);
9686 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9687 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9689 pr_warn("md: updating array disks failed. %d\n", ret);
9693 * Since mddev->delta_disks has already updated in update_raid_disks,
9694 * so it is time to check reshape.
9696 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9697 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9699 * reshape is happening in the remote node, we need to
9700 * update reshape_position and call start_reshape.
9702 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9703 if (mddev->pers->update_reshape_pos)
9704 mddev->pers->update_reshape_pos(mddev);
9705 if (mddev->pers->start_reshape)
9706 mddev->pers->start_reshape(mddev);
9707 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9708 mddev->reshape_position != MaxSector &&
9709 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9710 /* reshape is just done in another node. */
9711 mddev->reshape_position = MaxSector;
9712 if (mddev->pers->update_reshape_pos)
9713 mddev->pers->update_reshape_pos(mddev);
9716 /* Finally set the event to be up to date */
9717 mddev->events = le64_to_cpu(sb->events);
9720 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9723 struct page *swapout = rdev->sb_page;
9724 struct mdp_superblock_1 *sb;
9726 /* Store the sb page of the rdev in the swapout temporary
9727 * variable in case we err in the future
9729 rdev->sb_page = NULL;
9730 err = alloc_disk_sb(rdev);
9732 ClearPageUptodate(rdev->sb_page);
9733 rdev->sb_loaded = 0;
9734 err = super_types[mddev->major_version].
9735 load_super(rdev, NULL, mddev->minor_version);
9738 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9739 __func__, __LINE__, rdev->desc_nr, err);
9741 put_page(rdev->sb_page);
9742 rdev->sb_page = swapout;
9743 rdev->sb_loaded = 1;
9747 sb = page_address(rdev->sb_page);
9748 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9752 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9753 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9755 /* The other node finished recovery, call spare_active to set
9756 * device In_sync and mddev->degraded
9758 if (rdev->recovery_offset == MaxSector &&
9759 !test_bit(In_sync, &rdev->flags) &&
9760 mddev->pers->spare_active(mddev))
9761 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9767 void md_reload_sb(struct mddev *mddev, int nr)
9769 struct md_rdev *rdev;
9773 rdev_for_each_rcu(rdev, mddev) {
9774 if (rdev->desc_nr == nr)
9778 if (!rdev || rdev->desc_nr != nr) {
9779 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9783 err = read_rdev(mddev, rdev);
9787 check_sb_changes(mddev, rdev);
9789 /* Read all rdev's to update recovery_offset */
9790 rdev_for_each_rcu(rdev, mddev) {
9791 if (!test_bit(Faulty, &rdev->flags))
9792 read_rdev(mddev, rdev);
9795 EXPORT_SYMBOL(md_reload_sb);
9800 * Searches all registered partitions for autorun RAID arrays
9804 static DEFINE_MUTEX(detected_devices_mutex);
9805 static LIST_HEAD(all_detected_devices);
9806 struct detected_devices_node {
9807 struct list_head list;
9811 void md_autodetect_dev(dev_t dev)
9813 struct detected_devices_node *node_detected_dev;
9815 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9816 if (node_detected_dev) {
9817 node_detected_dev->dev = dev;
9818 mutex_lock(&detected_devices_mutex);
9819 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9820 mutex_unlock(&detected_devices_mutex);
9824 void md_autostart_arrays(int part)
9826 struct md_rdev *rdev;
9827 struct detected_devices_node *node_detected_dev;
9829 int i_scanned, i_passed;
9834 pr_info("md: Autodetecting RAID arrays.\n");
9836 mutex_lock(&detected_devices_mutex);
9837 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9839 node_detected_dev = list_entry(all_detected_devices.next,
9840 struct detected_devices_node, list);
9841 list_del(&node_detected_dev->list);
9842 dev = node_detected_dev->dev;
9843 kfree(node_detected_dev);
9844 mutex_unlock(&detected_devices_mutex);
9845 rdev = md_import_device(dev,0, 90);
9846 mutex_lock(&detected_devices_mutex);
9850 if (test_bit(Faulty, &rdev->flags))
9853 set_bit(AutoDetected, &rdev->flags);
9854 list_add(&rdev->same_set, &pending_raid_disks);
9857 mutex_unlock(&detected_devices_mutex);
9859 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9861 autorun_devices(part);
9864 #endif /* !MODULE */
9866 static __exit void md_exit(void)
9868 struct mddev *mddev;
9869 struct list_head *tmp;
9872 unregister_blkdev(MD_MAJOR,"md");
9873 unregister_blkdev(mdp_major, "mdp");
9874 unregister_reboot_notifier(&md_notifier);
9875 unregister_sysctl_table(raid_table_header);
9877 /* We cannot unload the modules while some process is
9878 * waiting for us in select() or poll() - wake them up
9881 while (waitqueue_active(&md_event_waiters)) {
9882 /* not safe to leave yet */
9883 wake_up(&md_event_waiters);
9887 remove_proc_entry("mdstat", NULL);
9889 for_each_mddev(mddev, tmp) {
9890 export_array(mddev);
9892 mddev->hold_active = 0;
9894 * for_each_mddev() will call mddev_put() at the end of each
9895 * iteration. As the mddev is now fully clear, this will
9896 * schedule the mddev for destruction by a workqueue, and the
9897 * destroy_workqueue() below will wait for that to complete.
9900 destroy_workqueue(md_rdev_misc_wq);
9901 destroy_workqueue(md_misc_wq);
9902 destroy_workqueue(md_wq);
9905 subsys_initcall(md_init);
9906 module_exit(md_exit)
9908 static int get_ro(char *buffer, const struct kernel_param *kp)
9910 return sprintf(buffer, "%d\n", start_readonly);
9912 static int set_ro(const char *val, const struct kernel_param *kp)
9914 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9917 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9918 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9919 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9920 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9922 MODULE_LICENSE("GPL");
9923 MODULE_DESCRIPTION("MD RAID framework");
9925 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);