1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/badblocks.h>
45 #include <linux/sysctl.h>
46 #include <linux/seq_file.h>
48 #include <linux/poll.h>
49 #include <linux/ctype.h>
50 #include <linux/string.h>
51 #include <linux/hdreg.h>
52 #include <linux/proc_fs.h>
53 #include <linux/random.h>
54 #include <linux/module.h>
55 #include <linux/reboot.h>
56 #include <linux/file.h>
57 #include <linux/compat.h>
58 #include <linux/delay.h>
59 #include <linux/raid/md_p.h>
60 #include <linux/raid/md_u.h>
61 #include <linux/raid/detect.h>
62 #include <linux/slab.h>
63 #include <linux/percpu-refcount.h>
64 #include <linux/part_stat.h>
66 #include <trace/events/block.h>
68 #include "md-bitmap.h"
69 #include "md-cluster.h"
72 static void autostart_arrays(int part);
75 /* pers_list is a list of registered personalities protected
77 * pers_lock does extra service to protect accesses to
78 * mddev->thread when the mutex cannot be held.
80 static LIST_HEAD(pers_list);
81 static DEFINE_SPINLOCK(pers_lock);
83 static struct kobj_type md_ktype;
85 struct md_cluster_operations *md_cluster_ops;
86 EXPORT_SYMBOL(md_cluster_ops);
87 static struct module *md_cluster_mod;
89 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
90 static struct workqueue_struct *md_wq;
91 static struct workqueue_struct *md_misc_wq;
92 static struct workqueue_struct *md_rdev_misc_wq;
94 static int remove_and_add_spares(struct mddev *mddev,
95 struct md_rdev *this);
96 static void mddev_detach(struct mddev *mddev);
99 * Default number of read corrections we'll attempt on an rdev
100 * before ejecting it from the array. We divide the read error
101 * count by 2 for every hour elapsed between read errors.
103 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
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 const struct block_device_operations md_fops;
335 static int start_readonly;
338 * The original mechanism for creating an md device is to create
339 * a device node in /dev and to open it. This causes races with device-close.
340 * The preferred method is to write to the "new_array" module parameter.
341 * This can avoid races.
342 * Setting create_on_open to false disables the original mechanism
343 * so all the races disappear.
345 static bool create_on_open = true;
347 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
350 if (!mddev || !bioset_initialized(&mddev->bio_set))
351 return bio_alloc(gfp_mask, nr_iovecs);
353 return bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set);
355 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
357 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
359 if (!mddev || !bioset_initialized(&mddev->sync_set))
360 return bio_alloc(GFP_NOIO, 1);
362 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
366 * We have a system wide 'event count' that is incremented
367 * on any 'interesting' event, and readers of /proc/mdstat
368 * can use 'poll' or 'select' to find out when the event
372 * start array, stop array, error, add device, remove device,
373 * start build, activate spare
375 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
376 static atomic_t md_event_count;
377 void md_new_event(struct mddev *mddev)
379 atomic_inc(&md_event_count);
380 wake_up(&md_event_waiters);
382 EXPORT_SYMBOL_GPL(md_new_event);
385 * Enables to iterate over all existing md arrays
386 * all_mddevs_lock protects this list.
388 static LIST_HEAD(all_mddevs);
389 static DEFINE_SPINLOCK(all_mddevs_lock);
392 * iterates through all used mddevs in the system.
393 * We take care to grab the all_mddevs_lock whenever navigating
394 * the list, and to always hold a refcount when unlocked.
395 * Any code which breaks out of this loop while own
396 * a reference to the current mddev and must mddev_put it.
398 #define for_each_mddev(_mddev,_tmp) \
400 for (({ spin_lock(&all_mddevs_lock); \
401 _tmp = all_mddevs.next; \
403 ({ if (_tmp != &all_mddevs) \
404 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
405 spin_unlock(&all_mddevs_lock); \
406 if (_mddev) mddev_put(_mddev); \
407 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
408 _tmp != &all_mddevs;}); \
409 ({ spin_lock(&all_mddevs_lock); \
410 _tmp = _tmp->next;}) \
413 /* Rather than calling directly into the personality make_request function,
414 * IO requests come here first so that we can check if the device is
415 * being suspended pending a reconfiguration.
416 * We hold a refcount over the call to ->make_request. By the time that
417 * call has finished, the bio has been linked into some internal structure
418 * and so is visible to ->quiesce(), so we don't need the refcount any more.
420 static bool is_suspended(struct mddev *mddev, struct bio *bio)
422 if (mddev->suspended)
424 if (bio_data_dir(bio) != WRITE)
426 if (mddev->suspend_lo >= mddev->suspend_hi)
428 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
430 if (bio_end_sector(bio) < mddev->suspend_lo)
435 void md_handle_request(struct mddev *mddev, struct bio *bio)
439 if (is_suspended(mddev, bio)) {
442 prepare_to_wait(&mddev->sb_wait, &__wait,
443 TASK_UNINTERRUPTIBLE);
444 if (!is_suspended(mddev, bio))
450 finish_wait(&mddev->sb_wait, &__wait);
452 atomic_inc(&mddev->active_io);
455 if (!mddev->pers->make_request(mddev, bio)) {
456 atomic_dec(&mddev->active_io);
457 wake_up(&mddev->sb_wait);
458 goto check_suspended;
461 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
462 wake_up(&mddev->sb_wait);
464 EXPORT_SYMBOL(md_handle_request);
468 bio_end_io_t *orig_bi_end_io;
469 void *orig_bi_private;
470 unsigned long start_time;
473 static void md_end_io(struct bio *bio)
475 struct md_io *md_io = bio->bi_private;
476 struct mddev *mddev = md_io->mddev;
478 disk_end_io_acct(mddev->gendisk, bio_op(bio), md_io->start_time);
480 bio->bi_end_io = md_io->orig_bi_end_io;
481 bio->bi_private = md_io->orig_bi_private;
483 mempool_free(md_io, &mddev->md_io_pool);
489 static blk_qc_t md_submit_bio(struct bio *bio)
491 const int rw = bio_data_dir(bio);
492 struct mddev *mddev = bio->bi_disk->private_data;
494 if (mddev == NULL || mddev->pers == NULL) {
496 return BLK_QC_T_NONE;
499 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
501 return BLK_QC_T_NONE;
504 blk_queue_split(&bio);
506 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
507 if (bio_sectors(bio) != 0)
508 bio->bi_status = BLK_STS_IOERR;
510 return BLK_QC_T_NONE;
513 if (bio->bi_end_io != md_end_io) {
516 md_io = mempool_alloc(&mddev->md_io_pool, GFP_NOIO);
517 md_io->mddev = mddev;
518 md_io->orig_bi_end_io = bio->bi_end_io;
519 md_io->orig_bi_private = bio->bi_private;
521 bio->bi_end_io = md_end_io;
522 bio->bi_private = md_io;
524 md_io->start_time = disk_start_io_acct(mddev->gendisk,
529 /* bio could be mergeable after passing to underlayer */
530 bio->bi_opf &= ~REQ_NOMERGE;
532 md_handle_request(mddev, bio);
534 return BLK_QC_T_NONE;
537 /* mddev_suspend makes sure no new requests are submitted
538 * to the device, and that any requests that have been submitted
539 * are completely handled.
540 * Once mddev_detach() is called and completes, the module will be
543 void mddev_suspend(struct mddev *mddev)
545 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
546 lockdep_assert_held(&mddev->reconfig_mutex);
547 if (mddev->suspended++)
550 wake_up(&mddev->sb_wait);
551 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
552 smp_mb__after_atomic();
553 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
554 mddev->pers->quiesce(mddev, 1);
555 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
556 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
558 del_timer_sync(&mddev->safemode_timer);
559 /* restrict memory reclaim I/O during raid array is suspend */
560 mddev->noio_flag = memalloc_noio_save();
562 EXPORT_SYMBOL_GPL(mddev_suspend);
564 void mddev_resume(struct mddev *mddev)
566 /* entred the memalloc scope from mddev_suspend() */
567 memalloc_noio_restore(mddev->noio_flag);
568 lockdep_assert_held(&mddev->reconfig_mutex);
569 if (--mddev->suspended)
571 wake_up(&mddev->sb_wait);
572 mddev->pers->quiesce(mddev, 0);
574 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
575 md_wakeup_thread(mddev->thread);
576 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
578 EXPORT_SYMBOL_GPL(mddev_resume);
580 int mddev_congested(struct mddev *mddev, int bits)
582 struct md_personality *pers = mddev->pers;
586 if (mddev->suspended)
588 else if (pers && pers->congested)
589 ret = pers->congested(mddev, bits);
593 EXPORT_SYMBOL_GPL(mddev_congested);
594 static int md_congested(void *data, int bits)
596 struct mddev *mddev = data;
597 return mddev_congested(mddev, bits);
601 * Generic flush handling for md
604 static void md_end_flush(struct bio *bio)
606 struct md_rdev *rdev = bio->bi_private;
607 struct mddev *mddev = rdev->mddev;
609 rdev_dec_pending(rdev, mddev);
611 if (atomic_dec_and_test(&mddev->flush_pending)) {
612 /* The pre-request flush has finished */
613 queue_work(md_wq, &mddev->flush_work);
618 static void md_submit_flush_data(struct work_struct *ws);
620 static void submit_flushes(struct work_struct *ws)
622 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
623 struct md_rdev *rdev;
625 mddev->start_flush = ktime_get_boottime();
626 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
627 atomic_set(&mddev->flush_pending, 1);
629 rdev_for_each_rcu(rdev, mddev)
630 if (rdev->raid_disk >= 0 &&
631 !test_bit(Faulty, &rdev->flags)) {
632 /* Take two references, one is dropped
633 * when request finishes, one after
634 * we reclaim rcu_read_lock
637 atomic_inc(&rdev->nr_pending);
638 atomic_inc(&rdev->nr_pending);
640 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
641 bi->bi_end_io = md_end_flush;
642 bi->bi_private = rdev;
643 bio_set_dev(bi, rdev->bdev);
644 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
645 atomic_inc(&mddev->flush_pending);
648 rdev_dec_pending(rdev, mddev);
651 if (atomic_dec_and_test(&mddev->flush_pending))
652 queue_work(md_wq, &mddev->flush_work);
655 static void md_submit_flush_data(struct work_struct *ws)
657 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
658 struct bio *bio = mddev->flush_bio;
661 * must reset flush_bio before calling into md_handle_request to avoid a
662 * deadlock, because other bios passed md_handle_request suspend check
663 * could wait for this and below md_handle_request could wait for those
664 * bios because of suspend check
666 mddev->last_flush = mddev->start_flush;
667 mddev->flush_bio = NULL;
668 wake_up(&mddev->sb_wait);
670 if (bio->bi_iter.bi_size == 0) {
671 /* an empty barrier - all done */
674 bio->bi_opf &= ~REQ_PREFLUSH;
675 md_handle_request(mddev, bio);
680 * Manages consolidation of flushes and submitting any flushes needed for
681 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
682 * being finished in another context. Returns false if the flushing is
683 * complete but still needs the I/O portion of the bio to be processed.
685 bool md_flush_request(struct mddev *mddev, struct bio *bio)
687 ktime_t start = ktime_get_boottime();
688 spin_lock_irq(&mddev->lock);
689 wait_event_lock_irq(mddev->sb_wait,
691 ktime_after(mddev->last_flush, start),
693 if (!ktime_after(mddev->last_flush, start)) {
694 WARN_ON(mddev->flush_bio);
695 mddev->flush_bio = bio;
698 spin_unlock_irq(&mddev->lock);
701 INIT_WORK(&mddev->flush_work, submit_flushes);
702 queue_work(md_wq, &mddev->flush_work);
704 /* flush was performed for some other bio while we waited. */
705 if (bio->bi_iter.bi_size == 0)
706 /* an empty barrier - all done */
709 bio->bi_opf &= ~REQ_PREFLUSH;
715 EXPORT_SYMBOL(md_flush_request);
717 static inline struct mddev *mddev_get(struct mddev *mddev)
719 atomic_inc(&mddev->active);
723 static void mddev_delayed_delete(struct work_struct *ws);
725 static void mddev_put(struct mddev *mddev)
727 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
729 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
730 mddev->ctime == 0 && !mddev->hold_active) {
731 /* Array is not configured at all, and not held active,
733 list_del_init(&mddev->all_mddevs);
736 * Call queue_work inside the spinlock so that
737 * flush_workqueue() after mddev_find will succeed in waiting
738 * for the work to be done.
740 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
741 queue_work(md_misc_wq, &mddev->del_work);
743 spin_unlock(&all_mddevs_lock);
746 static void md_safemode_timeout(struct timer_list *t);
748 void mddev_init(struct mddev *mddev)
750 kobject_init(&mddev->kobj, &md_ktype);
751 mutex_init(&mddev->open_mutex);
752 mutex_init(&mddev->reconfig_mutex);
753 mutex_init(&mddev->bitmap_info.mutex);
754 INIT_LIST_HEAD(&mddev->disks);
755 INIT_LIST_HEAD(&mddev->all_mddevs);
756 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
757 atomic_set(&mddev->active, 1);
758 atomic_set(&mddev->openers, 0);
759 atomic_set(&mddev->active_io, 0);
760 spin_lock_init(&mddev->lock);
761 atomic_set(&mddev->flush_pending, 0);
762 init_waitqueue_head(&mddev->sb_wait);
763 init_waitqueue_head(&mddev->recovery_wait);
764 mddev->reshape_position = MaxSector;
765 mddev->reshape_backwards = 0;
766 mddev->last_sync_action = "none";
767 mddev->resync_min = 0;
768 mddev->resync_max = MaxSector;
769 mddev->level = LEVEL_NONE;
771 EXPORT_SYMBOL_GPL(mddev_init);
773 static struct mddev *mddev_find(dev_t unit)
775 struct mddev *mddev, *new = NULL;
777 if (unit && MAJOR(unit) != MD_MAJOR)
778 unit &= ~((1<<MdpMinorShift)-1);
781 spin_lock(&all_mddevs_lock);
784 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
785 if (mddev->unit == unit) {
787 spin_unlock(&all_mddevs_lock);
793 list_add(&new->all_mddevs, &all_mddevs);
794 spin_unlock(&all_mddevs_lock);
795 new->hold_active = UNTIL_IOCTL;
799 /* find an unused unit number */
800 static int next_minor = 512;
801 int start = next_minor;
805 dev = MKDEV(MD_MAJOR, next_minor);
807 if (next_minor > MINORMASK)
809 if (next_minor == start) {
810 /* Oh dear, all in use. */
811 spin_unlock(&all_mddevs_lock);
817 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
818 if (mddev->unit == dev) {
824 new->md_minor = MINOR(dev);
825 new->hold_active = UNTIL_STOP;
826 list_add(&new->all_mddevs, &all_mddevs);
827 spin_unlock(&all_mddevs_lock);
830 spin_unlock(&all_mddevs_lock);
832 new = kzalloc(sizeof(*new), GFP_KERNEL);
837 if (MAJOR(unit) == MD_MAJOR)
838 new->md_minor = MINOR(unit);
840 new->md_minor = MINOR(unit) >> MdpMinorShift;
847 static struct attribute_group md_redundancy_group;
849 void mddev_unlock(struct mddev *mddev)
851 if (mddev->to_remove) {
852 /* These cannot be removed under reconfig_mutex as
853 * an access to the files will try to take reconfig_mutex
854 * while holding the file unremovable, which leads to
856 * So hold set sysfs_active while the remove in happeing,
857 * and anything else which might set ->to_remove or my
858 * otherwise change the sysfs namespace will fail with
859 * -EBUSY if sysfs_active is still set.
860 * We set sysfs_active under reconfig_mutex and elsewhere
861 * test it under the same mutex to ensure its correct value
864 struct attribute_group *to_remove = mddev->to_remove;
865 mddev->to_remove = NULL;
866 mddev->sysfs_active = 1;
867 mutex_unlock(&mddev->reconfig_mutex);
869 if (mddev->kobj.sd) {
870 if (to_remove != &md_redundancy_group)
871 sysfs_remove_group(&mddev->kobj, to_remove);
872 if (mddev->pers == NULL ||
873 mddev->pers->sync_request == NULL) {
874 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
875 if (mddev->sysfs_action)
876 sysfs_put(mddev->sysfs_action);
877 mddev->sysfs_action = NULL;
880 mddev->sysfs_active = 0;
882 mutex_unlock(&mddev->reconfig_mutex);
884 /* As we've dropped the mutex we need a spinlock to
885 * make sure the thread doesn't disappear
887 spin_lock(&pers_lock);
888 md_wakeup_thread(mddev->thread);
889 wake_up(&mddev->sb_wait);
890 spin_unlock(&pers_lock);
892 EXPORT_SYMBOL_GPL(mddev_unlock);
894 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
896 struct md_rdev *rdev;
898 rdev_for_each_rcu(rdev, mddev)
899 if (rdev->desc_nr == nr)
904 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
906 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
908 struct md_rdev *rdev;
910 rdev_for_each(rdev, mddev)
911 if (rdev->bdev->bd_dev == dev)
917 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
919 struct md_rdev *rdev;
921 rdev_for_each_rcu(rdev, mddev)
922 if (rdev->bdev->bd_dev == dev)
927 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
929 static struct md_personality *find_pers(int level, char *clevel)
931 struct md_personality *pers;
932 list_for_each_entry(pers, &pers_list, list) {
933 if (level != LEVEL_NONE && pers->level == level)
935 if (strcmp(pers->name, clevel)==0)
941 /* return the offset of the super block in 512byte sectors */
942 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
944 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
945 return MD_NEW_SIZE_SECTORS(num_sectors);
948 static int alloc_disk_sb(struct md_rdev *rdev)
950 rdev->sb_page = alloc_page(GFP_KERNEL);
956 void md_rdev_clear(struct md_rdev *rdev)
959 put_page(rdev->sb_page);
961 rdev->sb_page = NULL;
966 put_page(rdev->bb_page);
967 rdev->bb_page = NULL;
969 badblocks_exit(&rdev->badblocks);
971 EXPORT_SYMBOL_GPL(md_rdev_clear);
973 static void super_written(struct bio *bio)
975 struct md_rdev *rdev = bio->bi_private;
976 struct mddev *mddev = rdev->mddev;
978 if (bio->bi_status) {
979 pr_err("md: super_written gets error=%d\n", bio->bi_status);
980 md_error(mddev, rdev);
981 if (!test_bit(Faulty, &rdev->flags)
982 && (bio->bi_opf & MD_FAILFAST)) {
983 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
984 set_bit(LastDev, &rdev->flags);
987 clear_bit(LastDev, &rdev->flags);
989 if (atomic_dec_and_test(&mddev->pending_writes))
990 wake_up(&mddev->sb_wait);
991 rdev_dec_pending(rdev, mddev);
995 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
996 sector_t sector, int size, struct page *page)
998 /* write first size bytes of page to sector of rdev
999 * Increment mddev->pending_writes before returning
1000 * and decrement it on completion, waking up sb_wait
1001 * if zero is reached.
1002 * If an error occurred, call md_error
1010 if (test_bit(Faulty, &rdev->flags))
1013 bio = md_bio_alloc_sync(mddev);
1015 atomic_inc(&rdev->nr_pending);
1017 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
1018 bio->bi_iter.bi_sector = sector;
1019 bio_add_page(bio, page, size, 0);
1020 bio->bi_private = rdev;
1021 bio->bi_end_io = super_written;
1023 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
1024 test_bit(FailFast, &rdev->flags) &&
1025 !test_bit(LastDev, &rdev->flags))
1027 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
1029 atomic_inc(&mddev->pending_writes);
1033 int md_super_wait(struct mddev *mddev)
1035 /* wait for all superblock writes that were scheduled to complete */
1036 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
1037 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
1042 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
1043 struct page *page, int op, int op_flags, bool metadata_op)
1045 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
1048 if (metadata_op && rdev->meta_bdev)
1049 bio_set_dev(bio, rdev->meta_bdev);
1051 bio_set_dev(bio, rdev->bdev);
1052 bio_set_op_attrs(bio, op, op_flags);
1054 bio->bi_iter.bi_sector = sector + rdev->sb_start;
1055 else if (rdev->mddev->reshape_position != MaxSector &&
1056 (rdev->mddev->reshape_backwards ==
1057 (sector >= rdev->mddev->reshape_position)))
1058 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
1060 bio->bi_iter.bi_sector = sector + rdev->data_offset;
1061 bio_add_page(bio, page, size, 0);
1063 submit_bio_wait(bio);
1065 ret = !bio->bi_status;
1069 EXPORT_SYMBOL_GPL(sync_page_io);
1071 static int read_disk_sb(struct md_rdev *rdev, int size)
1073 char b[BDEVNAME_SIZE];
1075 if (rdev->sb_loaded)
1078 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1080 rdev->sb_loaded = 1;
1084 pr_err("md: disabled device %s, could not read superblock.\n",
1085 bdevname(rdev->bdev,b));
1089 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1091 return sb1->set_uuid0 == sb2->set_uuid0 &&
1092 sb1->set_uuid1 == sb2->set_uuid1 &&
1093 sb1->set_uuid2 == sb2->set_uuid2 &&
1094 sb1->set_uuid3 == sb2->set_uuid3;
1097 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1100 mdp_super_t *tmp1, *tmp2;
1102 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1103 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1105 if (!tmp1 || !tmp2) {
1114 * nr_disks is not constant
1119 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1126 static u32 md_csum_fold(u32 csum)
1128 csum = (csum & 0xffff) + (csum >> 16);
1129 return (csum & 0xffff) + (csum >> 16);
1132 static unsigned int calc_sb_csum(mdp_super_t *sb)
1135 u32 *sb32 = (u32*)sb;
1137 unsigned int disk_csum, csum;
1139 disk_csum = sb->sb_csum;
1142 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1144 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1147 /* This used to use csum_partial, which was wrong for several
1148 * reasons including that different results are returned on
1149 * different architectures. It isn't critical that we get exactly
1150 * the same return value as before (we always csum_fold before
1151 * testing, and that removes any differences). However as we
1152 * know that csum_partial always returned a 16bit value on
1153 * alphas, do a fold to maximise conformity to previous behaviour.
1155 sb->sb_csum = md_csum_fold(disk_csum);
1157 sb->sb_csum = disk_csum;
1163 * Handle superblock details.
1164 * We want to be able to handle multiple superblock formats
1165 * so we have a common interface to them all, and an array of
1166 * different handlers.
1167 * We rely on user-space to write the initial superblock, and support
1168 * reading and updating of superblocks.
1169 * Interface methods are:
1170 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1171 * loads and validates a superblock on dev.
1172 * if refdev != NULL, compare superblocks on both devices
1174 * 0 - dev has a superblock that is compatible with refdev
1175 * 1 - dev has a superblock that is compatible and newer than refdev
1176 * so dev should be used as the refdev in future
1177 * -EINVAL superblock incompatible or invalid
1178 * -othererror e.g. -EIO
1180 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1181 * Verify that dev is acceptable into mddev.
1182 * The first time, mddev->raid_disks will be 0, and data from
1183 * dev should be merged in. Subsequent calls check that dev
1184 * is new enough. Return 0 or -EINVAL
1186 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1187 * Update the superblock for rdev with data in mddev
1188 * This does not write to disc.
1194 struct module *owner;
1195 int (*load_super)(struct md_rdev *rdev,
1196 struct md_rdev *refdev,
1198 int (*validate_super)(struct mddev *mddev,
1199 struct md_rdev *rdev);
1200 void (*sync_super)(struct mddev *mddev,
1201 struct md_rdev *rdev);
1202 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1203 sector_t num_sectors);
1204 int (*allow_new_offset)(struct md_rdev *rdev,
1205 unsigned long long new_offset);
1209 * Check that the given mddev has no bitmap.
1211 * This function is called from the run method of all personalities that do not
1212 * support bitmaps. It prints an error message and returns non-zero if mddev
1213 * has a bitmap. Otherwise, it returns 0.
1216 int md_check_no_bitmap(struct mddev *mddev)
1218 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1220 pr_warn("%s: bitmaps are not supported for %s\n",
1221 mdname(mddev), mddev->pers->name);
1224 EXPORT_SYMBOL(md_check_no_bitmap);
1227 * load_super for 0.90.0
1229 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1231 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1234 bool spare_disk = true;
1237 * Calculate the position of the superblock (512byte sectors),
1238 * it's at the end of the disk.
1240 * It also happens to be a multiple of 4Kb.
1242 rdev->sb_start = calc_dev_sboffset(rdev);
1244 ret = read_disk_sb(rdev, MD_SB_BYTES);
1250 bdevname(rdev->bdev, b);
1251 sb = page_address(rdev->sb_page);
1253 if (sb->md_magic != MD_SB_MAGIC) {
1254 pr_warn("md: invalid raid superblock magic on %s\n", b);
1258 if (sb->major_version != 0 ||
1259 sb->minor_version < 90 ||
1260 sb->minor_version > 91) {
1261 pr_warn("Bad version number %d.%d on %s\n",
1262 sb->major_version, sb->minor_version, b);
1266 if (sb->raid_disks <= 0)
1269 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1270 pr_warn("md: invalid superblock checksum on %s\n", b);
1274 rdev->preferred_minor = sb->md_minor;
1275 rdev->data_offset = 0;
1276 rdev->new_data_offset = 0;
1277 rdev->sb_size = MD_SB_BYTES;
1278 rdev->badblocks.shift = -1;
1280 if (sb->level == LEVEL_MULTIPATH)
1283 rdev->desc_nr = sb->this_disk.number;
1285 /* not spare disk, or LEVEL_MULTIPATH */
1286 if (sb->level == LEVEL_MULTIPATH ||
1287 (rdev->desc_nr >= 0 &&
1288 rdev->desc_nr < MD_SB_DISKS &&
1289 sb->disks[rdev->desc_nr].state &
1290 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1300 mdp_super_t *refsb = page_address(refdev->sb_page);
1301 if (!md_uuid_equal(refsb, sb)) {
1302 pr_warn("md: %s has different UUID to %s\n",
1303 b, bdevname(refdev->bdev,b2));
1306 if (!md_sb_equal(refsb, sb)) {
1307 pr_warn("md: %s has same UUID but different superblock to %s\n",
1308 b, bdevname(refdev->bdev, b2));
1312 ev2 = md_event(refsb);
1314 if (!spare_disk && ev1 > ev2)
1319 rdev->sectors = rdev->sb_start;
1320 /* Limit to 4TB as metadata cannot record more than that.
1321 * (not needed for Linear and RAID0 as metadata doesn't
1324 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1325 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1327 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1328 /* "this cannot possibly happen" ... */
1336 * validate_super for 0.90.0
1338 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1341 mdp_super_t *sb = page_address(rdev->sb_page);
1342 __u64 ev1 = md_event(sb);
1344 rdev->raid_disk = -1;
1345 clear_bit(Faulty, &rdev->flags);
1346 clear_bit(In_sync, &rdev->flags);
1347 clear_bit(Bitmap_sync, &rdev->flags);
1348 clear_bit(WriteMostly, &rdev->flags);
1350 if (mddev->raid_disks == 0) {
1351 mddev->major_version = 0;
1352 mddev->minor_version = sb->minor_version;
1353 mddev->patch_version = sb->patch_version;
1354 mddev->external = 0;
1355 mddev->chunk_sectors = sb->chunk_size >> 9;
1356 mddev->ctime = sb->ctime;
1357 mddev->utime = sb->utime;
1358 mddev->level = sb->level;
1359 mddev->clevel[0] = 0;
1360 mddev->layout = sb->layout;
1361 mddev->raid_disks = sb->raid_disks;
1362 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1363 mddev->events = ev1;
1364 mddev->bitmap_info.offset = 0;
1365 mddev->bitmap_info.space = 0;
1366 /* bitmap can use 60 K after the 4K superblocks */
1367 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1368 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1369 mddev->reshape_backwards = 0;
1371 if (mddev->minor_version >= 91) {
1372 mddev->reshape_position = sb->reshape_position;
1373 mddev->delta_disks = sb->delta_disks;
1374 mddev->new_level = sb->new_level;
1375 mddev->new_layout = sb->new_layout;
1376 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1377 if (mddev->delta_disks < 0)
1378 mddev->reshape_backwards = 1;
1380 mddev->reshape_position = MaxSector;
1381 mddev->delta_disks = 0;
1382 mddev->new_level = mddev->level;
1383 mddev->new_layout = mddev->layout;
1384 mddev->new_chunk_sectors = mddev->chunk_sectors;
1386 if (mddev->level == 0)
1389 if (sb->state & (1<<MD_SB_CLEAN))
1390 mddev->recovery_cp = MaxSector;
1392 if (sb->events_hi == sb->cp_events_hi &&
1393 sb->events_lo == sb->cp_events_lo) {
1394 mddev->recovery_cp = sb->recovery_cp;
1396 mddev->recovery_cp = 0;
1399 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1400 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1401 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1402 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1404 mddev->max_disks = MD_SB_DISKS;
1406 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1407 mddev->bitmap_info.file == NULL) {
1408 mddev->bitmap_info.offset =
1409 mddev->bitmap_info.default_offset;
1410 mddev->bitmap_info.space =
1411 mddev->bitmap_info.default_space;
1414 } else if (mddev->pers == NULL) {
1415 /* Insist on good event counter while assembling, except
1416 * for spares (which don't need an event count) */
1418 if (sb->disks[rdev->desc_nr].state & (
1419 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1420 if (ev1 < mddev->events)
1422 } else if (mddev->bitmap) {
1423 /* if adding to array with a bitmap, then we can accept an
1424 * older device ... but not too old.
1426 if (ev1 < mddev->bitmap->events_cleared)
1428 if (ev1 < mddev->events)
1429 set_bit(Bitmap_sync, &rdev->flags);
1431 if (ev1 < mddev->events)
1432 /* just a hot-add of a new device, leave raid_disk at -1 */
1436 if (mddev->level != LEVEL_MULTIPATH) {
1437 desc = sb->disks + rdev->desc_nr;
1439 if (desc->state & (1<<MD_DISK_FAULTY))
1440 set_bit(Faulty, &rdev->flags);
1441 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1442 desc->raid_disk < mddev->raid_disks */) {
1443 set_bit(In_sync, &rdev->flags);
1444 rdev->raid_disk = desc->raid_disk;
1445 rdev->saved_raid_disk = desc->raid_disk;
1446 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1447 /* active but not in sync implies recovery up to
1448 * reshape position. We don't know exactly where
1449 * that is, so set to zero for now */
1450 if (mddev->minor_version >= 91) {
1451 rdev->recovery_offset = 0;
1452 rdev->raid_disk = desc->raid_disk;
1455 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1456 set_bit(WriteMostly, &rdev->flags);
1457 if (desc->state & (1<<MD_DISK_FAILFAST))
1458 set_bit(FailFast, &rdev->flags);
1459 } else /* MULTIPATH are always insync */
1460 set_bit(In_sync, &rdev->flags);
1465 * sync_super for 0.90.0
1467 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1470 struct md_rdev *rdev2;
1471 int next_spare = mddev->raid_disks;
1473 /* make rdev->sb match mddev data..
1476 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1477 * 3/ any empty disks < next_spare become removed
1479 * disks[0] gets initialised to REMOVED because
1480 * we cannot be sure from other fields if it has
1481 * been initialised or not.
1484 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1486 rdev->sb_size = MD_SB_BYTES;
1488 sb = page_address(rdev->sb_page);
1490 memset(sb, 0, sizeof(*sb));
1492 sb->md_magic = MD_SB_MAGIC;
1493 sb->major_version = mddev->major_version;
1494 sb->patch_version = mddev->patch_version;
1495 sb->gvalid_words = 0; /* ignored */
1496 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1497 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1498 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1499 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1501 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1502 sb->level = mddev->level;
1503 sb->size = mddev->dev_sectors / 2;
1504 sb->raid_disks = mddev->raid_disks;
1505 sb->md_minor = mddev->md_minor;
1506 sb->not_persistent = 0;
1507 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1509 sb->events_hi = (mddev->events>>32);
1510 sb->events_lo = (u32)mddev->events;
1512 if (mddev->reshape_position == MaxSector)
1513 sb->minor_version = 90;
1515 sb->minor_version = 91;
1516 sb->reshape_position = mddev->reshape_position;
1517 sb->new_level = mddev->new_level;
1518 sb->delta_disks = mddev->delta_disks;
1519 sb->new_layout = mddev->new_layout;
1520 sb->new_chunk = mddev->new_chunk_sectors << 9;
1522 mddev->minor_version = sb->minor_version;
1525 sb->recovery_cp = mddev->recovery_cp;
1526 sb->cp_events_hi = (mddev->events>>32);
1527 sb->cp_events_lo = (u32)mddev->events;
1528 if (mddev->recovery_cp == MaxSector)
1529 sb->state = (1<< MD_SB_CLEAN);
1531 sb->recovery_cp = 0;
1533 sb->layout = mddev->layout;
1534 sb->chunk_size = mddev->chunk_sectors << 9;
1536 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1537 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1539 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1540 rdev_for_each(rdev2, mddev) {
1543 int is_active = test_bit(In_sync, &rdev2->flags);
1545 if (rdev2->raid_disk >= 0 &&
1546 sb->minor_version >= 91)
1547 /* we have nowhere to store the recovery_offset,
1548 * but if it is not below the reshape_position,
1549 * we can piggy-back on that.
1552 if (rdev2->raid_disk < 0 ||
1553 test_bit(Faulty, &rdev2->flags))
1556 desc_nr = rdev2->raid_disk;
1558 desc_nr = next_spare++;
1559 rdev2->desc_nr = desc_nr;
1560 d = &sb->disks[rdev2->desc_nr];
1562 d->number = rdev2->desc_nr;
1563 d->major = MAJOR(rdev2->bdev->bd_dev);
1564 d->minor = MINOR(rdev2->bdev->bd_dev);
1566 d->raid_disk = rdev2->raid_disk;
1568 d->raid_disk = rdev2->desc_nr; /* compatibility */
1569 if (test_bit(Faulty, &rdev2->flags))
1570 d->state = (1<<MD_DISK_FAULTY);
1571 else if (is_active) {
1572 d->state = (1<<MD_DISK_ACTIVE);
1573 if (test_bit(In_sync, &rdev2->flags))
1574 d->state |= (1<<MD_DISK_SYNC);
1582 if (test_bit(WriteMostly, &rdev2->flags))
1583 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1584 if (test_bit(FailFast, &rdev2->flags))
1585 d->state |= (1<<MD_DISK_FAILFAST);
1587 /* now set the "removed" and "faulty" bits on any missing devices */
1588 for (i=0 ; i < mddev->raid_disks ; i++) {
1589 mdp_disk_t *d = &sb->disks[i];
1590 if (d->state == 0 && d->number == 0) {
1593 d->state = (1<<MD_DISK_REMOVED);
1594 d->state |= (1<<MD_DISK_FAULTY);
1598 sb->nr_disks = nr_disks;
1599 sb->active_disks = active;
1600 sb->working_disks = working;
1601 sb->failed_disks = failed;
1602 sb->spare_disks = spare;
1604 sb->this_disk = sb->disks[rdev->desc_nr];
1605 sb->sb_csum = calc_sb_csum(sb);
1609 * rdev_size_change for 0.90.0
1611 static unsigned long long
1612 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1614 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1615 return 0; /* component must fit device */
1616 if (rdev->mddev->bitmap_info.offset)
1617 return 0; /* can't move bitmap */
1618 rdev->sb_start = calc_dev_sboffset(rdev);
1619 if (!num_sectors || num_sectors > rdev->sb_start)
1620 num_sectors = rdev->sb_start;
1621 /* Limit to 4TB as metadata cannot record more than that.
1622 * 4TB == 2^32 KB, or 2*2^32 sectors.
1624 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1625 num_sectors = (sector_t)(2ULL << 32) - 2;
1627 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1629 } while (md_super_wait(rdev->mddev) < 0);
1634 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1636 /* non-zero offset changes not possible with v0.90 */
1637 return new_offset == 0;
1641 * version 1 superblock
1644 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1648 unsigned long long newcsum;
1649 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1650 __le32 *isuper = (__le32*)sb;
1652 disk_csum = sb->sb_csum;
1655 for (; size >= 4; size -= 4)
1656 newcsum += le32_to_cpu(*isuper++);
1659 newcsum += le16_to_cpu(*(__le16*) isuper);
1661 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1662 sb->sb_csum = disk_csum;
1663 return cpu_to_le32(csum);
1666 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1668 struct mdp_superblock_1 *sb;
1672 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1674 bool spare_disk = true;
1677 * Calculate the position of the superblock in 512byte sectors.
1678 * It is always aligned to a 4K boundary and
1679 * depeding on minor_version, it can be:
1680 * 0: At least 8K, but less than 12K, from end of device
1681 * 1: At start of device
1682 * 2: 4K from start of device.
1684 switch(minor_version) {
1686 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1688 sb_start &= ~(sector_t)(4*2-1);
1699 rdev->sb_start = sb_start;
1701 /* superblock is rarely larger than 1K, but it can be larger,
1702 * and it is safe to read 4k, so we do that
1704 ret = read_disk_sb(rdev, 4096);
1705 if (ret) return ret;
1707 sb = page_address(rdev->sb_page);
1709 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1710 sb->major_version != cpu_to_le32(1) ||
1711 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1712 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1713 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1716 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1717 pr_warn("md: invalid superblock checksum on %s\n",
1718 bdevname(rdev->bdev,b));
1721 if (le64_to_cpu(sb->data_size) < 10) {
1722 pr_warn("md: data_size too small on %s\n",
1723 bdevname(rdev->bdev,b));
1728 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1729 /* Some padding is non-zero, might be a new feature */
1732 rdev->preferred_minor = 0xffff;
1733 rdev->data_offset = le64_to_cpu(sb->data_offset);
1734 rdev->new_data_offset = rdev->data_offset;
1735 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1736 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1737 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1738 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1740 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1741 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1742 if (rdev->sb_size & bmask)
1743 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1746 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1749 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1752 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1755 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1757 if (!rdev->bb_page) {
1758 rdev->bb_page = alloc_page(GFP_KERNEL);
1762 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1763 rdev->badblocks.count == 0) {
1764 /* need to load the bad block list.
1765 * Currently we limit it to one page.
1771 int sectors = le16_to_cpu(sb->bblog_size);
1772 if (sectors > (PAGE_SIZE / 512))
1774 offset = le32_to_cpu(sb->bblog_offset);
1777 bb_sector = (long long)offset;
1778 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1779 rdev->bb_page, REQ_OP_READ, 0, true))
1781 bbp = (__le64 *)page_address(rdev->bb_page);
1782 rdev->badblocks.shift = sb->bblog_shift;
1783 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1784 u64 bb = le64_to_cpu(*bbp);
1785 int count = bb & (0x3ff);
1786 u64 sector = bb >> 10;
1787 sector <<= sb->bblog_shift;
1788 count <<= sb->bblog_shift;
1791 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1794 } else if (sb->bblog_offset != 0)
1795 rdev->badblocks.shift = 0;
1797 if ((le32_to_cpu(sb->feature_map) &
1798 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1799 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1800 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1801 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1804 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1808 /* not spare disk, or LEVEL_MULTIPATH */
1809 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1810 (rdev->desc_nr >= 0 &&
1811 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1812 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1813 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1823 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1825 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1826 sb->level != refsb->level ||
1827 sb->layout != refsb->layout ||
1828 sb->chunksize != refsb->chunksize) {
1829 pr_warn("md: %s has strangely different superblock to %s\n",
1830 bdevname(rdev->bdev,b),
1831 bdevname(refdev->bdev,b2));
1834 ev1 = le64_to_cpu(sb->events);
1835 ev2 = le64_to_cpu(refsb->events);
1837 if (!spare_disk && ev1 > ev2)
1842 if (minor_version) {
1843 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1844 sectors -= rdev->data_offset;
1846 sectors = rdev->sb_start;
1847 if (sectors < le64_to_cpu(sb->data_size))
1849 rdev->sectors = le64_to_cpu(sb->data_size);
1853 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1855 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1856 __u64 ev1 = le64_to_cpu(sb->events);
1858 rdev->raid_disk = -1;
1859 clear_bit(Faulty, &rdev->flags);
1860 clear_bit(In_sync, &rdev->flags);
1861 clear_bit(Bitmap_sync, &rdev->flags);
1862 clear_bit(WriteMostly, &rdev->flags);
1864 if (mddev->raid_disks == 0) {
1865 mddev->major_version = 1;
1866 mddev->patch_version = 0;
1867 mddev->external = 0;
1868 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1869 mddev->ctime = le64_to_cpu(sb->ctime);
1870 mddev->utime = le64_to_cpu(sb->utime);
1871 mddev->level = le32_to_cpu(sb->level);
1872 mddev->clevel[0] = 0;
1873 mddev->layout = le32_to_cpu(sb->layout);
1874 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1875 mddev->dev_sectors = le64_to_cpu(sb->size);
1876 mddev->events = ev1;
1877 mddev->bitmap_info.offset = 0;
1878 mddev->bitmap_info.space = 0;
1879 /* Default location for bitmap is 1K after superblock
1880 * using 3K - total of 4K
1882 mddev->bitmap_info.default_offset = 1024 >> 9;
1883 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1884 mddev->reshape_backwards = 0;
1886 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1887 memcpy(mddev->uuid, sb->set_uuid, 16);
1889 mddev->max_disks = (4096-256)/2;
1891 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1892 mddev->bitmap_info.file == NULL) {
1893 mddev->bitmap_info.offset =
1894 (__s32)le32_to_cpu(sb->bitmap_offset);
1895 /* Metadata doesn't record how much space is available.
1896 * For 1.0, we assume we can use up to the superblock
1897 * if before, else to 4K beyond superblock.
1898 * For others, assume no change is possible.
1900 if (mddev->minor_version > 0)
1901 mddev->bitmap_info.space = 0;
1902 else if (mddev->bitmap_info.offset > 0)
1903 mddev->bitmap_info.space =
1904 8 - mddev->bitmap_info.offset;
1906 mddev->bitmap_info.space =
1907 -mddev->bitmap_info.offset;
1910 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1911 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1912 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1913 mddev->new_level = le32_to_cpu(sb->new_level);
1914 mddev->new_layout = le32_to_cpu(sb->new_layout);
1915 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1916 if (mddev->delta_disks < 0 ||
1917 (mddev->delta_disks == 0 &&
1918 (le32_to_cpu(sb->feature_map)
1919 & MD_FEATURE_RESHAPE_BACKWARDS)))
1920 mddev->reshape_backwards = 1;
1922 mddev->reshape_position = MaxSector;
1923 mddev->delta_disks = 0;
1924 mddev->new_level = mddev->level;
1925 mddev->new_layout = mddev->layout;
1926 mddev->new_chunk_sectors = mddev->chunk_sectors;
1929 if (mddev->level == 0 &&
1930 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1933 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1934 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1936 if (le32_to_cpu(sb->feature_map) &
1937 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1938 if (le32_to_cpu(sb->feature_map) &
1939 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1941 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1942 (le32_to_cpu(sb->feature_map) &
1943 MD_FEATURE_MULTIPLE_PPLS))
1945 set_bit(MD_HAS_PPL, &mddev->flags);
1947 } else if (mddev->pers == NULL) {
1948 /* Insist of good event counter while assembling, except for
1949 * spares (which don't need an event count) */
1951 if (rdev->desc_nr >= 0 &&
1952 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1953 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1954 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1955 if (ev1 < mddev->events)
1957 } else if (mddev->bitmap) {
1958 /* If adding to array with a bitmap, then we can accept an
1959 * older device, but not too old.
1961 if (ev1 < mddev->bitmap->events_cleared)
1963 if (ev1 < mddev->events)
1964 set_bit(Bitmap_sync, &rdev->flags);
1966 if (ev1 < mddev->events)
1967 /* just a hot-add of a new device, leave raid_disk at -1 */
1970 if (mddev->level != LEVEL_MULTIPATH) {
1972 if (rdev->desc_nr < 0 ||
1973 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1974 role = MD_DISK_ROLE_SPARE;
1977 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1979 case MD_DISK_ROLE_SPARE: /* spare */
1981 case MD_DISK_ROLE_FAULTY: /* faulty */
1982 set_bit(Faulty, &rdev->flags);
1984 case MD_DISK_ROLE_JOURNAL: /* journal device */
1985 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1986 /* journal device without journal feature */
1987 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1990 set_bit(Journal, &rdev->flags);
1991 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1992 rdev->raid_disk = 0;
1995 rdev->saved_raid_disk = role;
1996 if ((le32_to_cpu(sb->feature_map) &
1997 MD_FEATURE_RECOVERY_OFFSET)) {
1998 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1999 if (!(le32_to_cpu(sb->feature_map) &
2000 MD_FEATURE_RECOVERY_BITMAP))
2001 rdev->saved_raid_disk = -1;
2004 * If the array is FROZEN, then the device can't
2005 * be in_sync with rest of array.
2007 if (!test_bit(MD_RECOVERY_FROZEN,
2009 set_bit(In_sync, &rdev->flags);
2011 rdev->raid_disk = role;
2014 if (sb->devflags & WriteMostly1)
2015 set_bit(WriteMostly, &rdev->flags);
2016 if (sb->devflags & FailFast1)
2017 set_bit(FailFast, &rdev->flags);
2018 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
2019 set_bit(Replacement, &rdev->flags);
2020 } else /* MULTIPATH are always insync */
2021 set_bit(In_sync, &rdev->flags);
2026 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
2028 struct mdp_superblock_1 *sb;
2029 struct md_rdev *rdev2;
2031 /* make rdev->sb match mddev and rdev data. */
2033 sb = page_address(rdev->sb_page);
2035 sb->feature_map = 0;
2037 sb->recovery_offset = cpu_to_le64(0);
2038 memset(sb->pad3, 0, sizeof(sb->pad3));
2040 sb->utime = cpu_to_le64((__u64)mddev->utime);
2041 sb->events = cpu_to_le64(mddev->events);
2043 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
2044 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
2045 sb->resync_offset = cpu_to_le64(MaxSector);
2047 sb->resync_offset = cpu_to_le64(0);
2049 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2051 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2052 sb->size = cpu_to_le64(mddev->dev_sectors);
2053 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2054 sb->level = cpu_to_le32(mddev->level);
2055 sb->layout = cpu_to_le32(mddev->layout);
2056 if (test_bit(FailFast, &rdev->flags))
2057 sb->devflags |= FailFast1;
2059 sb->devflags &= ~FailFast1;
2061 if (test_bit(WriteMostly, &rdev->flags))
2062 sb->devflags |= WriteMostly1;
2064 sb->devflags &= ~WriteMostly1;
2065 sb->data_offset = cpu_to_le64(rdev->data_offset);
2066 sb->data_size = cpu_to_le64(rdev->sectors);
2068 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2069 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2070 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2073 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2074 !test_bit(In_sync, &rdev->flags)) {
2076 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2077 sb->recovery_offset =
2078 cpu_to_le64(rdev->recovery_offset);
2079 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2081 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2083 /* Note: recovery_offset and journal_tail share space */
2084 if (test_bit(Journal, &rdev->flags))
2085 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2086 if (test_bit(Replacement, &rdev->flags))
2088 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2090 if (mddev->reshape_position != MaxSector) {
2091 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2092 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2093 sb->new_layout = cpu_to_le32(mddev->new_layout);
2094 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2095 sb->new_level = cpu_to_le32(mddev->new_level);
2096 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2097 if (mddev->delta_disks == 0 &&
2098 mddev->reshape_backwards)
2100 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2101 if (rdev->new_data_offset != rdev->data_offset) {
2103 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2104 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2105 - rdev->data_offset));
2109 if (mddev_is_clustered(mddev))
2110 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2112 if (rdev->badblocks.count == 0)
2113 /* Nothing to do for bad blocks*/ ;
2114 else if (sb->bblog_offset == 0)
2115 /* Cannot record bad blocks on this device */
2116 md_error(mddev, rdev);
2118 struct badblocks *bb = &rdev->badblocks;
2119 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2121 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2126 seq = read_seqbegin(&bb->lock);
2128 memset(bbp, 0xff, PAGE_SIZE);
2130 for (i = 0 ; i < bb->count ; i++) {
2131 u64 internal_bb = p[i];
2132 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2133 | BB_LEN(internal_bb));
2134 bbp[i] = cpu_to_le64(store_bb);
2137 if (read_seqretry(&bb->lock, seq))
2140 bb->sector = (rdev->sb_start +
2141 (int)le32_to_cpu(sb->bblog_offset));
2142 bb->size = le16_to_cpu(sb->bblog_size);
2147 rdev_for_each(rdev2, mddev)
2148 if (rdev2->desc_nr+1 > max_dev)
2149 max_dev = rdev2->desc_nr+1;
2151 if (max_dev > le32_to_cpu(sb->max_dev)) {
2153 sb->max_dev = cpu_to_le32(max_dev);
2154 rdev->sb_size = max_dev * 2 + 256;
2155 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2156 if (rdev->sb_size & bmask)
2157 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2159 max_dev = le32_to_cpu(sb->max_dev);
2161 for (i=0; i<max_dev;i++)
2162 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2164 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2165 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2167 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2168 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2170 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2172 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2173 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2174 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2177 rdev_for_each(rdev2, mddev) {
2179 if (test_bit(Faulty, &rdev2->flags))
2180 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2181 else if (test_bit(In_sync, &rdev2->flags))
2182 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2183 else if (test_bit(Journal, &rdev2->flags))
2184 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2185 else if (rdev2->raid_disk >= 0)
2186 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2188 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2191 sb->sb_csum = calc_sb_1_csum(sb);
2194 static unsigned long long
2195 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2197 struct mdp_superblock_1 *sb;
2198 sector_t max_sectors;
2199 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2200 return 0; /* component must fit device */
2201 if (rdev->data_offset != rdev->new_data_offset)
2202 return 0; /* too confusing */
2203 if (rdev->sb_start < rdev->data_offset) {
2204 /* minor versions 1 and 2; superblock before data */
2205 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2206 max_sectors -= rdev->data_offset;
2207 if (!num_sectors || num_sectors > max_sectors)
2208 num_sectors = max_sectors;
2209 } else if (rdev->mddev->bitmap_info.offset) {
2210 /* minor version 0 with bitmap we can't move */
2213 /* minor version 0; superblock after data */
2215 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
2216 sb_start &= ~(sector_t)(4*2 - 1);
2217 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
2218 if (!num_sectors || num_sectors > max_sectors)
2219 num_sectors = max_sectors;
2220 rdev->sb_start = sb_start;
2222 sb = page_address(rdev->sb_page);
2223 sb->data_size = cpu_to_le64(num_sectors);
2224 sb->super_offset = cpu_to_le64(rdev->sb_start);
2225 sb->sb_csum = calc_sb_1_csum(sb);
2227 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2229 } while (md_super_wait(rdev->mddev) < 0);
2235 super_1_allow_new_offset(struct md_rdev *rdev,
2236 unsigned long long new_offset)
2238 /* All necessary checks on new >= old have been done */
2239 struct bitmap *bitmap;
2240 if (new_offset >= rdev->data_offset)
2243 /* with 1.0 metadata, there is no metadata to tread on
2244 * so we can always move back */
2245 if (rdev->mddev->minor_version == 0)
2248 /* otherwise we must be sure not to step on
2249 * any metadata, so stay:
2250 * 36K beyond start of superblock
2251 * beyond end of badblocks
2252 * beyond write-intent bitmap
2254 if (rdev->sb_start + (32+4)*2 > new_offset)
2256 bitmap = rdev->mddev->bitmap;
2257 if (bitmap && !rdev->mddev->bitmap_info.file &&
2258 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2259 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2261 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2267 static struct super_type super_types[] = {
2270 .owner = THIS_MODULE,
2271 .load_super = super_90_load,
2272 .validate_super = super_90_validate,
2273 .sync_super = super_90_sync,
2274 .rdev_size_change = super_90_rdev_size_change,
2275 .allow_new_offset = super_90_allow_new_offset,
2279 .owner = THIS_MODULE,
2280 .load_super = super_1_load,
2281 .validate_super = super_1_validate,
2282 .sync_super = super_1_sync,
2283 .rdev_size_change = super_1_rdev_size_change,
2284 .allow_new_offset = super_1_allow_new_offset,
2288 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2290 if (mddev->sync_super) {
2291 mddev->sync_super(mddev, rdev);
2295 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2297 super_types[mddev->major_version].sync_super(mddev, rdev);
2300 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2302 struct md_rdev *rdev, *rdev2;
2305 rdev_for_each_rcu(rdev, mddev1) {
2306 if (test_bit(Faulty, &rdev->flags) ||
2307 test_bit(Journal, &rdev->flags) ||
2308 rdev->raid_disk == -1)
2310 rdev_for_each_rcu(rdev2, mddev2) {
2311 if (test_bit(Faulty, &rdev2->flags) ||
2312 test_bit(Journal, &rdev2->flags) ||
2313 rdev2->raid_disk == -1)
2315 if (rdev->bdev->bd_contains ==
2316 rdev2->bdev->bd_contains) {
2326 static LIST_HEAD(pending_raid_disks);
2329 * Try to register data integrity profile for an mddev
2331 * This is called when an array is started and after a disk has been kicked
2332 * from the array. It only succeeds if all working and active component devices
2333 * are integrity capable with matching profiles.
2335 int md_integrity_register(struct mddev *mddev)
2337 struct md_rdev *rdev, *reference = NULL;
2339 if (list_empty(&mddev->disks))
2340 return 0; /* nothing to do */
2341 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2342 return 0; /* shouldn't register, or already is */
2343 rdev_for_each(rdev, mddev) {
2344 /* skip spares and non-functional disks */
2345 if (test_bit(Faulty, &rdev->flags))
2347 if (rdev->raid_disk < 0)
2350 /* Use the first rdev as the reference */
2354 /* does this rdev's profile match the reference profile? */
2355 if (blk_integrity_compare(reference->bdev->bd_disk,
2356 rdev->bdev->bd_disk) < 0)
2359 if (!reference || !bdev_get_integrity(reference->bdev))
2362 * All component devices are integrity capable and have matching
2363 * profiles, register the common profile for the md device.
2365 blk_integrity_register(mddev->gendisk,
2366 bdev_get_integrity(reference->bdev));
2368 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2369 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2370 pr_err("md: failed to create integrity pool for %s\n",
2376 EXPORT_SYMBOL(md_integrity_register);
2379 * Attempt to add an rdev, but only if it is consistent with the current
2382 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2384 struct blk_integrity *bi_mddev;
2385 char name[BDEVNAME_SIZE];
2387 if (!mddev->gendisk)
2390 bi_mddev = blk_get_integrity(mddev->gendisk);
2392 if (!bi_mddev) /* nothing to do */
2395 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2396 pr_err("%s: incompatible integrity profile for %s\n",
2397 mdname(mddev), bdevname(rdev->bdev, name));
2403 EXPORT_SYMBOL(md_integrity_add_rdev);
2405 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2407 char b[BDEVNAME_SIZE];
2411 /* prevent duplicates */
2412 if (find_rdev(mddev, rdev->bdev->bd_dev))
2415 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2419 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2420 if (!test_bit(Journal, &rdev->flags) &&
2422 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2424 /* Cannot change size, so fail
2425 * If mddev->level <= 0, then we don't care
2426 * about aligning sizes (e.g. linear)
2428 if (mddev->level > 0)
2431 mddev->dev_sectors = rdev->sectors;
2434 /* Verify rdev->desc_nr is unique.
2435 * If it is -1, assign a free number, else
2436 * check number is not in use
2439 if (rdev->desc_nr < 0) {
2442 choice = mddev->raid_disks;
2443 while (md_find_rdev_nr_rcu(mddev, choice))
2445 rdev->desc_nr = choice;
2447 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2453 if (!test_bit(Journal, &rdev->flags) &&
2454 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2455 pr_warn("md: %s: array is limited to %d devices\n",
2456 mdname(mddev), mddev->max_disks);
2459 bdevname(rdev->bdev,b);
2460 strreplace(b, '/', '!');
2462 rdev->mddev = mddev;
2463 pr_debug("md: bind<%s>\n", b);
2465 if (mddev->raid_disks)
2466 mddev_create_serial_pool(mddev, rdev, false);
2468 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2471 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2472 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2473 /* failure here is OK */;
2474 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2476 list_add_rcu(&rdev->same_set, &mddev->disks);
2477 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2479 /* May as well allow recovery to be retried once */
2480 mddev->recovery_disabled++;
2485 pr_warn("md: failed to register dev-%s for %s\n",
2490 static void rdev_delayed_delete(struct work_struct *ws)
2492 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2493 kobject_del(&rdev->kobj);
2494 kobject_put(&rdev->kobj);
2497 static void unbind_rdev_from_array(struct md_rdev *rdev)
2499 char b[BDEVNAME_SIZE];
2501 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2502 list_del_rcu(&rdev->same_set);
2503 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2504 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2506 sysfs_remove_link(&rdev->kobj, "block");
2507 sysfs_put(rdev->sysfs_state);
2508 rdev->sysfs_state = NULL;
2509 rdev->badblocks.count = 0;
2510 /* We need to delay this, otherwise we can deadlock when
2511 * writing to 'remove' to "dev/state". We also need
2512 * to delay it due to rcu usage.
2515 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2516 kobject_get(&rdev->kobj);
2517 queue_work(md_rdev_misc_wq, &rdev->del_work);
2521 * prevent the device from being mounted, repartitioned or
2522 * otherwise reused by a RAID array (or any other kernel
2523 * subsystem), by bd_claiming the device.
2525 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2528 struct block_device *bdev;
2530 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2531 shared ? (struct md_rdev *)lock_rdev : rdev);
2533 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2534 MAJOR(dev), MINOR(dev));
2535 return PTR_ERR(bdev);
2541 static void unlock_rdev(struct md_rdev *rdev)
2543 struct block_device *bdev = rdev->bdev;
2545 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2548 void md_autodetect_dev(dev_t dev);
2550 static void export_rdev(struct md_rdev *rdev)
2552 char b[BDEVNAME_SIZE];
2554 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2555 md_rdev_clear(rdev);
2557 if (test_bit(AutoDetected, &rdev->flags))
2558 md_autodetect_dev(rdev->bdev->bd_dev);
2561 kobject_put(&rdev->kobj);
2564 void md_kick_rdev_from_array(struct md_rdev *rdev)
2566 unbind_rdev_from_array(rdev);
2569 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2571 static void export_array(struct mddev *mddev)
2573 struct md_rdev *rdev;
2575 while (!list_empty(&mddev->disks)) {
2576 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2578 md_kick_rdev_from_array(rdev);
2580 mddev->raid_disks = 0;
2581 mddev->major_version = 0;
2584 static bool set_in_sync(struct mddev *mddev)
2586 lockdep_assert_held(&mddev->lock);
2587 if (!mddev->in_sync) {
2588 mddev->sync_checkers++;
2589 spin_unlock(&mddev->lock);
2590 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2591 spin_lock(&mddev->lock);
2592 if (!mddev->in_sync &&
2593 percpu_ref_is_zero(&mddev->writes_pending)) {
2596 * Ensure ->in_sync is visible before we clear
2600 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2601 sysfs_notify_dirent_safe(mddev->sysfs_state);
2603 if (--mddev->sync_checkers == 0)
2604 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2606 if (mddev->safemode == 1)
2607 mddev->safemode = 0;
2608 return mddev->in_sync;
2611 static void sync_sbs(struct mddev *mddev, int nospares)
2613 /* Update each superblock (in-memory image), but
2614 * if we are allowed to, skip spares which already
2615 * have the right event counter, or have one earlier
2616 * (which would mean they aren't being marked as dirty
2617 * with the rest of the array)
2619 struct md_rdev *rdev;
2620 rdev_for_each(rdev, mddev) {
2621 if (rdev->sb_events == mddev->events ||
2623 rdev->raid_disk < 0 &&
2624 rdev->sb_events+1 == mddev->events)) {
2625 /* Don't update this superblock */
2626 rdev->sb_loaded = 2;
2628 sync_super(mddev, rdev);
2629 rdev->sb_loaded = 1;
2634 static bool does_sb_need_changing(struct mddev *mddev)
2636 struct md_rdev *rdev;
2637 struct mdp_superblock_1 *sb;
2640 /* Find a good rdev */
2641 rdev_for_each(rdev, mddev)
2642 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2645 /* No good device found. */
2649 sb = page_address(rdev->sb_page);
2650 /* Check if a device has become faulty or a spare become active */
2651 rdev_for_each(rdev, mddev) {
2652 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2653 /* Device activated? */
2654 if (role == 0xffff && rdev->raid_disk >=0 &&
2655 !test_bit(Faulty, &rdev->flags))
2657 /* Device turned faulty? */
2658 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2662 /* Check if any mddev parameters have changed */
2663 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2664 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2665 (mddev->layout != le32_to_cpu(sb->layout)) ||
2666 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2667 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2673 void md_update_sb(struct mddev *mddev, int force_change)
2675 struct md_rdev *rdev;
2678 int any_badblocks_changed = 0;
2683 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2688 if (mddev_is_clustered(mddev)) {
2689 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2691 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2693 ret = md_cluster_ops->metadata_update_start(mddev);
2694 /* Has someone else has updated the sb */
2695 if (!does_sb_need_changing(mddev)) {
2697 md_cluster_ops->metadata_update_cancel(mddev);
2698 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2699 BIT(MD_SB_CHANGE_DEVS) |
2700 BIT(MD_SB_CHANGE_CLEAN));
2706 * First make sure individual recovery_offsets are correct
2707 * curr_resync_completed can only be used during recovery.
2708 * During reshape/resync it might use array-addresses rather
2709 * that device addresses.
2711 rdev_for_each(rdev, mddev) {
2712 if (rdev->raid_disk >= 0 &&
2713 mddev->delta_disks >= 0 &&
2714 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2715 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2716 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2717 !test_bit(Journal, &rdev->flags) &&
2718 !test_bit(In_sync, &rdev->flags) &&
2719 mddev->curr_resync_completed > rdev->recovery_offset)
2720 rdev->recovery_offset = mddev->curr_resync_completed;
2723 if (!mddev->persistent) {
2724 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2725 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2726 if (!mddev->external) {
2727 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2728 rdev_for_each(rdev, mddev) {
2729 if (rdev->badblocks.changed) {
2730 rdev->badblocks.changed = 0;
2731 ack_all_badblocks(&rdev->badblocks);
2732 md_error(mddev, rdev);
2734 clear_bit(Blocked, &rdev->flags);
2735 clear_bit(BlockedBadBlocks, &rdev->flags);
2736 wake_up(&rdev->blocked_wait);
2739 wake_up(&mddev->sb_wait);
2743 spin_lock(&mddev->lock);
2745 mddev->utime = ktime_get_real_seconds();
2747 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2749 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2750 /* just a clean<-> dirty transition, possibly leave spares alone,
2751 * though if events isn't the right even/odd, we will have to do
2757 if (mddev->degraded)
2758 /* If the array is degraded, then skipping spares is both
2759 * dangerous and fairly pointless.
2760 * Dangerous because a device that was removed from the array
2761 * might have a event_count that still looks up-to-date,
2762 * so it can be re-added without a resync.
2763 * Pointless because if there are any spares to skip,
2764 * then a recovery will happen and soon that array won't
2765 * be degraded any more and the spare can go back to sleep then.
2769 sync_req = mddev->in_sync;
2771 /* If this is just a dirty<->clean transition, and the array is clean
2772 * and 'events' is odd, we can roll back to the previous clean state */
2774 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2775 && mddev->can_decrease_events
2776 && mddev->events != 1) {
2778 mddev->can_decrease_events = 0;
2780 /* otherwise we have to go forward and ... */
2782 mddev->can_decrease_events = nospares;
2786 * This 64-bit counter should never wrap.
2787 * Either we are in around ~1 trillion A.C., assuming
2788 * 1 reboot per second, or we have a bug...
2790 WARN_ON(mddev->events == 0);
2792 rdev_for_each(rdev, mddev) {
2793 if (rdev->badblocks.changed)
2794 any_badblocks_changed++;
2795 if (test_bit(Faulty, &rdev->flags))
2796 set_bit(FaultRecorded, &rdev->flags);
2799 sync_sbs(mddev, nospares);
2800 spin_unlock(&mddev->lock);
2802 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2803 mdname(mddev), mddev->in_sync);
2806 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2808 md_bitmap_update_sb(mddev->bitmap);
2809 rdev_for_each(rdev, mddev) {
2810 char b[BDEVNAME_SIZE];
2812 if (rdev->sb_loaded != 1)
2813 continue; /* no noise on spare devices */
2815 if (!test_bit(Faulty, &rdev->flags)) {
2816 md_super_write(mddev,rdev,
2817 rdev->sb_start, rdev->sb_size,
2819 pr_debug("md: (write) %s's sb offset: %llu\n",
2820 bdevname(rdev->bdev, b),
2821 (unsigned long long)rdev->sb_start);
2822 rdev->sb_events = mddev->events;
2823 if (rdev->badblocks.size) {
2824 md_super_write(mddev, rdev,
2825 rdev->badblocks.sector,
2826 rdev->badblocks.size << 9,
2828 rdev->badblocks.size = 0;
2832 pr_debug("md: %s (skipping faulty)\n",
2833 bdevname(rdev->bdev, b));
2835 if (mddev->level == LEVEL_MULTIPATH)
2836 /* only need to write one superblock... */
2839 if (md_super_wait(mddev) < 0)
2841 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2843 if (mddev_is_clustered(mddev) && ret == 0)
2844 md_cluster_ops->metadata_update_finish(mddev);
2846 if (mddev->in_sync != sync_req ||
2847 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2848 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2849 /* have to write it out again */
2851 wake_up(&mddev->sb_wait);
2852 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2853 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2855 rdev_for_each(rdev, mddev) {
2856 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2857 clear_bit(Blocked, &rdev->flags);
2859 if (any_badblocks_changed)
2860 ack_all_badblocks(&rdev->badblocks);
2861 clear_bit(BlockedBadBlocks, &rdev->flags);
2862 wake_up(&rdev->blocked_wait);
2865 EXPORT_SYMBOL(md_update_sb);
2867 static int add_bound_rdev(struct md_rdev *rdev)
2869 struct mddev *mddev = rdev->mddev;
2871 bool add_journal = test_bit(Journal, &rdev->flags);
2873 if (!mddev->pers->hot_remove_disk || add_journal) {
2874 /* If there is hot_add_disk but no hot_remove_disk
2875 * then added disks for geometry changes,
2876 * and should be added immediately.
2878 super_types[mddev->major_version].
2879 validate_super(mddev, rdev);
2881 mddev_suspend(mddev);
2882 err = mddev->pers->hot_add_disk(mddev, rdev);
2884 mddev_resume(mddev);
2886 md_kick_rdev_from_array(rdev);
2890 sysfs_notify_dirent_safe(rdev->sysfs_state);
2892 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2893 if (mddev->degraded)
2894 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2895 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2896 md_new_event(mddev);
2897 md_wakeup_thread(mddev->thread);
2901 /* words written to sysfs files may, or may not, be \n terminated.
2902 * We want to accept with case. For this we use cmd_match.
2904 static int cmd_match(const char *cmd, const char *str)
2906 /* See if cmd, written into a sysfs file, matches
2907 * str. They must either be the same, or cmd can
2908 * have a trailing newline
2910 while (*cmd && *str && *cmd == *str) {
2921 struct rdev_sysfs_entry {
2922 struct attribute attr;
2923 ssize_t (*show)(struct md_rdev *, char *);
2924 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2928 state_show(struct md_rdev *rdev, char *page)
2932 unsigned long flags = READ_ONCE(rdev->flags);
2934 if (test_bit(Faulty, &flags) ||
2935 (!test_bit(ExternalBbl, &flags) &&
2936 rdev->badblocks.unacked_exist))
2937 len += sprintf(page+len, "faulty%s", sep);
2938 if (test_bit(In_sync, &flags))
2939 len += sprintf(page+len, "in_sync%s", sep);
2940 if (test_bit(Journal, &flags))
2941 len += sprintf(page+len, "journal%s", sep);
2942 if (test_bit(WriteMostly, &flags))
2943 len += sprintf(page+len, "write_mostly%s", sep);
2944 if (test_bit(Blocked, &flags) ||
2945 (rdev->badblocks.unacked_exist
2946 && !test_bit(Faulty, &flags)))
2947 len += sprintf(page+len, "blocked%s", sep);
2948 if (!test_bit(Faulty, &flags) &&
2949 !test_bit(Journal, &flags) &&
2950 !test_bit(In_sync, &flags))
2951 len += sprintf(page+len, "spare%s", sep);
2952 if (test_bit(WriteErrorSeen, &flags))
2953 len += sprintf(page+len, "write_error%s", sep);
2954 if (test_bit(WantReplacement, &flags))
2955 len += sprintf(page+len, "want_replacement%s", sep);
2956 if (test_bit(Replacement, &flags))
2957 len += sprintf(page+len, "replacement%s", sep);
2958 if (test_bit(ExternalBbl, &flags))
2959 len += sprintf(page+len, "external_bbl%s", sep);
2960 if (test_bit(FailFast, &flags))
2961 len += sprintf(page+len, "failfast%s", sep);
2966 return len+sprintf(page+len, "\n");
2970 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2973 * faulty - simulates an error
2974 * remove - disconnects the device
2975 * writemostly - sets write_mostly
2976 * -writemostly - clears write_mostly
2977 * blocked - sets the Blocked flags
2978 * -blocked - clears the Blocked and possibly simulates an error
2979 * insync - sets Insync providing device isn't active
2980 * -insync - clear Insync for a device with a slot assigned,
2981 * so that it gets rebuilt based on bitmap
2982 * write_error - sets WriteErrorSeen
2983 * -write_error - clears WriteErrorSeen
2984 * {,-}failfast - set/clear FailFast
2987 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2988 md_error(rdev->mddev, rdev);
2989 if (test_bit(Faulty, &rdev->flags))
2993 } else if (cmd_match(buf, "remove")) {
2994 if (rdev->mddev->pers) {
2995 clear_bit(Blocked, &rdev->flags);
2996 remove_and_add_spares(rdev->mddev, rdev);
2998 if (rdev->raid_disk >= 0)
3001 struct mddev *mddev = rdev->mddev;
3003 if (mddev_is_clustered(mddev))
3004 err = md_cluster_ops->remove_disk(mddev, rdev);
3007 md_kick_rdev_from_array(rdev);
3009 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3010 md_wakeup_thread(mddev->thread);
3012 md_new_event(mddev);
3015 } else if (cmd_match(buf, "writemostly")) {
3016 set_bit(WriteMostly, &rdev->flags);
3017 mddev_create_serial_pool(rdev->mddev, rdev, false);
3019 } else if (cmd_match(buf, "-writemostly")) {
3020 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3021 clear_bit(WriteMostly, &rdev->flags);
3023 } else if (cmd_match(buf, "blocked")) {
3024 set_bit(Blocked, &rdev->flags);
3026 } else if (cmd_match(buf, "-blocked")) {
3027 if (!test_bit(Faulty, &rdev->flags) &&
3028 !test_bit(ExternalBbl, &rdev->flags) &&
3029 rdev->badblocks.unacked_exist) {
3030 /* metadata handler doesn't understand badblocks,
3031 * so we need to fail the device
3033 md_error(rdev->mddev, rdev);
3035 clear_bit(Blocked, &rdev->flags);
3036 clear_bit(BlockedBadBlocks, &rdev->flags);
3037 wake_up(&rdev->blocked_wait);
3038 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3039 md_wakeup_thread(rdev->mddev->thread);
3042 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3043 set_bit(In_sync, &rdev->flags);
3045 } else if (cmd_match(buf, "failfast")) {
3046 set_bit(FailFast, &rdev->flags);
3048 } else if (cmd_match(buf, "-failfast")) {
3049 clear_bit(FailFast, &rdev->flags);
3051 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3052 !test_bit(Journal, &rdev->flags)) {
3053 if (rdev->mddev->pers == NULL) {
3054 clear_bit(In_sync, &rdev->flags);
3055 rdev->saved_raid_disk = rdev->raid_disk;
3056 rdev->raid_disk = -1;
3059 } else if (cmd_match(buf, "write_error")) {
3060 set_bit(WriteErrorSeen, &rdev->flags);
3062 } else if (cmd_match(buf, "-write_error")) {
3063 clear_bit(WriteErrorSeen, &rdev->flags);
3065 } else if (cmd_match(buf, "want_replacement")) {
3066 /* Any non-spare device that is not a replacement can
3067 * become want_replacement at any time, but we then need to
3068 * check if recovery is needed.
3070 if (rdev->raid_disk >= 0 &&
3071 !test_bit(Journal, &rdev->flags) &&
3072 !test_bit(Replacement, &rdev->flags))
3073 set_bit(WantReplacement, &rdev->flags);
3074 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3075 md_wakeup_thread(rdev->mddev->thread);
3077 } else if (cmd_match(buf, "-want_replacement")) {
3078 /* Clearing 'want_replacement' is always allowed.
3079 * Once replacements starts it is too late though.
3082 clear_bit(WantReplacement, &rdev->flags);
3083 } else if (cmd_match(buf, "replacement")) {
3084 /* Can only set a device as a replacement when array has not
3085 * yet been started. Once running, replacement is automatic
3086 * from spares, or by assigning 'slot'.
3088 if (rdev->mddev->pers)
3091 set_bit(Replacement, &rdev->flags);
3094 } else if (cmd_match(buf, "-replacement")) {
3095 /* Similarly, can only clear Replacement before start */
3096 if (rdev->mddev->pers)
3099 clear_bit(Replacement, &rdev->flags);
3102 } else if (cmd_match(buf, "re-add")) {
3103 if (!rdev->mddev->pers)
3105 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3106 rdev->saved_raid_disk >= 0) {
3107 /* clear_bit is performed _after_ all the devices
3108 * have their local Faulty bit cleared. If any writes
3109 * happen in the meantime in the local node, they
3110 * will land in the local bitmap, which will be synced
3111 * by this node eventually
3113 if (!mddev_is_clustered(rdev->mddev) ||
3114 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3115 clear_bit(Faulty, &rdev->flags);
3116 err = add_bound_rdev(rdev);
3120 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3121 set_bit(ExternalBbl, &rdev->flags);
3122 rdev->badblocks.shift = 0;
3124 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3125 clear_bit(ExternalBbl, &rdev->flags);
3129 sysfs_notify_dirent_safe(rdev->sysfs_state);
3130 return err ? err : len;
3132 static struct rdev_sysfs_entry rdev_state =
3133 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3136 errors_show(struct md_rdev *rdev, char *page)
3138 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3142 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3147 rv = kstrtouint(buf, 10, &n);
3150 atomic_set(&rdev->corrected_errors, n);
3153 static struct rdev_sysfs_entry rdev_errors =
3154 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3157 slot_show(struct md_rdev *rdev, char *page)
3159 if (test_bit(Journal, &rdev->flags))
3160 return sprintf(page, "journal\n");
3161 else if (rdev->raid_disk < 0)
3162 return sprintf(page, "none\n");
3164 return sprintf(page, "%d\n", rdev->raid_disk);
3168 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3173 if (test_bit(Journal, &rdev->flags))
3175 if (strncmp(buf, "none", 4)==0)
3178 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3182 if (rdev->mddev->pers && slot == -1) {
3183 /* Setting 'slot' on an active array requires also
3184 * updating the 'rd%d' link, and communicating
3185 * with the personality with ->hot_*_disk.
3186 * For now we only support removing
3187 * failed/spare devices. This normally happens automatically,
3188 * but not when the metadata is externally managed.
3190 if (rdev->raid_disk == -1)
3192 /* personality does all needed checks */
3193 if (rdev->mddev->pers->hot_remove_disk == NULL)
3195 clear_bit(Blocked, &rdev->flags);
3196 remove_and_add_spares(rdev->mddev, rdev);
3197 if (rdev->raid_disk >= 0)
3199 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3200 md_wakeup_thread(rdev->mddev->thread);
3201 } else if (rdev->mddev->pers) {
3202 /* Activating a spare .. or possibly reactivating
3203 * if we ever get bitmaps working here.
3207 if (rdev->raid_disk != -1)
3210 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3213 if (rdev->mddev->pers->hot_add_disk == NULL)
3216 if (slot >= rdev->mddev->raid_disks &&
3217 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3220 rdev->raid_disk = slot;
3221 if (test_bit(In_sync, &rdev->flags))
3222 rdev->saved_raid_disk = slot;
3224 rdev->saved_raid_disk = -1;
3225 clear_bit(In_sync, &rdev->flags);
3226 clear_bit(Bitmap_sync, &rdev->flags);
3227 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3229 rdev->raid_disk = -1;
3232 sysfs_notify_dirent_safe(rdev->sysfs_state);
3233 if (sysfs_link_rdev(rdev->mddev, rdev))
3234 /* failure here is OK */;
3235 /* don't wakeup anyone, leave that to userspace. */
3237 if (slot >= rdev->mddev->raid_disks &&
3238 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3240 rdev->raid_disk = slot;
3241 /* assume it is working */
3242 clear_bit(Faulty, &rdev->flags);
3243 clear_bit(WriteMostly, &rdev->flags);
3244 set_bit(In_sync, &rdev->flags);
3245 sysfs_notify_dirent_safe(rdev->sysfs_state);
3250 static struct rdev_sysfs_entry rdev_slot =
3251 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3254 offset_show(struct md_rdev *rdev, char *page)
3256 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3260 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3262 unsigned long long offset;
3263 if (kstrtoull(buf, 10, &offset) < 0)
3265 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3267 if (rdev->sectors && rdev->mddev->external)
3268 /* Must set offset before size, so overlap checks
3271 rdev->data_offset = offset;
3272 rdev->new_data_offset = offset;
3276 static struct rdev_sysfs_entry rdev_offset =
3277 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3279 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3281 return sprintf(page, "%llu\n",
3282 (unsigned long long)rdev->new_data_offset);
3285 static ssize_t new_offset_store(struct md_rdev *rdev,
3286 const char *buf, size_t len)
3288 unsigned long long new_offset;
3289 struct mddev *mddev = rdev->mddev;
3291 if (kstrtoull(buf, 10, &new_offset) < 0)
3294 if (mddev->sync_thread ||
3295 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3297 if (new_offset == rdev->data_offset)
3298 /* reset is always permitted */
3300 else if (new_offset > rdev->data_offset) {
3301 /* must not push array size beyond rdev_sectors */
3302 if (new_offset - rdev->data_offset
3303 + mddev->dev_sectors > rdev->sectors)
3306 /* Metadata worries about other space details. */
3308 /* decreasing the offset is inconsistent with a backwards
3311 if (new_offset < rdev->data_offset &&
3312 mddev->reshape_backwards)
3314 /* Increasing offset is inconsistent with forwards
3315 * reshape. reshape_direction should be set to
3316 * 'backwards' first.
3318 if (new_offset > rdev->data_offset &&
3319 !mddev->reshape_backwards)
3322 if (mddev->pers && mddev->persistent &&
3323 !super_types[mddev->major_version]
3324 .allow_new_offset(rdev, new_offset))
3326 rdev->new_data_offset = new_offset;
3327 if (new_offset > rdev->data_offset)
3328 mddev->reshape_backwards = 1;
3329 else if (new_offset < rdev->data_offset)
3330 mddev->reshape_backwards = 0;
3334 static struct rdev_sysfs_entry rdev_new_offset =
3335 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3338 rdev_size_show(struct md_rdev *rdev, char *page)
3340 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3343 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3345 /* check if two start/length pairs overlap */
3353 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3355 unsigned long long blocks;
3358 if (kstrtoull(buf, 10, &blocks) < 0)
3361 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3362 return -EINVAL; /* sector conversion overflow */
3365 if (new != blocks * 2)
3366 return -EINVAL; /* unsigned long long to sector_t overflow */
3373 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3375 struct mddev *my_mddev = rdev->mddev;
3376 sector_t oldsectors = rdev->sectors;
3379 if (test_bit(Journal, &rdev->flags))
3381 if (strict_blocks_to_sectors(buf, §ors) < 0)
3383 if (rdev->data_offset != rdev->new_data_offset)
3384 return -EINVAL; /* too confusing */
3385 if (my_mddev->pers && rdev->raid_disk >= 0) {
3386 if (my_mddev->persistent) {
3387 sectors = super_types[my_mddev->major_version].
3388 rdev_size_change(rdev, sectors);
3391 } else if (!sectors)
3392 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3394 if (!my_mddev->pers->resize)
3395 /* Cannot change size for RAID0 or Linear etc */
3398 if (sectors < my_mddev->dev_sectors)
3399 return -EINVAL; /* component must fit device */
3401 rdev->sectors = sectors;
3402 if (sectors > oldsectors && my_mddev->external) {
3403 /* Need to check that all other rdevs with the same
3404 * ->bdev do not overlap. 'rcu' is sufficient to walk
3405 * the rdev lists safely.
3406 * This check does not provide a hard guarantee, it
3407 * just helps avoid dangerous mistakes.
3409 struct mddev *mddev;
3411 struct list_head *tmp;
3414 for_each_mddev(mddev, tmp) {
3415 struct md_rdev *rdev2;
3417 rdev_for_each(rdev2, mddev)
3418 if (rdev->bdev == rdev2->bdev &&
3420 overlaps(rdev->data_offset, rdev->sectors,
3433 /* Someone else could have slipped in a size
3434 * change here, but doing so is just silly.
3435 * We put oldsectors back because we *know* it is
3436 * safe, and trust userspace not to race with
3439 rdev->sectors = oldsectors;
3446 static struct rdev_sysfs_entry rdev_size =
3447 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3449 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3451 unsigned long long recovery_start = rdev->recovery_offset;
3453 if (test_bit(In_sync, &rdev->flags) ||
3454 recovery_start == MaxSector)
3455 return sprintf(page, "none\n");
3457 return sprintf(page, "%llu\n", recovery_start);
3460 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3462 unsigned long long recovery_start;
3464 if (cmd_match(buf, "none"))
3465 recovery_start = MaxSector;
3466 else if (kstrtoull(buf, 10, &recovery_start))
3469 if (rdev->mddev->pers &&
3470 rdev->raid_disk >= 0)
3473 rdev->recovery_offset = recovery_start;
3474 if (recovery_start == MaxSector)
3475 set_bit(In_sync, &rdev->flags);
3477 clear_bit(In_sync, &rdev->flags);
3481 static struct rdev_sysfs_entry rdev_recovery_start =
3482 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3484 /* sysfs access to bad-blocks list.
3485 * We present two files.
3486 * 'bad-blocks' lists sector numbers and lengths of ranges that
3487 * are recorded as bad. The list is truncated to fit within
3488 * the one-page limit of sysfs.
3489 * Writing "sector length" to this file adds an acknowledged
3491 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3492 * been acknowledged. Writing to this file adds bad blocks
3493 * without acknowledging them. This is largely for testing.
3495 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3497 return badblocks_show(&rdev->badblocks, page, 0);
3499 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3501 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3502 /* Maybe that ack was all we needed */
3503 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3504 wake_up(&rdev->blocked_wait);
3507 static struct rdev_sysfs_entry rdev_bad_blocks =
3508 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3510 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3512 return badblocks_show(&rdev->badblocks, page, 1);
3514 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3516 return badblocks_store(&rdev->badblocks, page, len, 1);
3518 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3519 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3522 ppl_sector_show(struct md_rdev *rdev, char *page)
3524 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3528 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3530 unsigned long long sector;
3532 if (kstrtoull(buf, 10, §or) < 0)
3534 if (sector != (sector_t)sector)
3537 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3538 rdev->raid_disk >= 0)
3541 if (rdev->mddev->persistent) {
3542 if (rdev->mddev->major_version == 0)
3544 if ((sector > rdev->sb_start &&
3545 sector - rdev->sb_start > S16_MAX) ||
3546 (sector < rdev->sb_start &&
3547 rdev->sb_start - sector > -S16_MIN))
3549 rdev->ppl.offset = sector - rdev->sb_start;
3550 } else if (!rdev->mddev->external) {
3553 rdev->ppl.sector = sector;
3557 static struct rdev_sysfs_entry rdev_ppl_sector =
3558 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3561 ppl_size_show(struct md_rdev *rdev, char *page)
3563 return sprintf(page, "%u\n", rdev->ppl.size);
3567 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3571 if (kstrtouint(buf, 10, &size) < 0)
3574 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3575 rdev->raid_disk >= 0)
3578 if (rdev->mddev->persistent) {
3579 if (rdev->mddev->major_version == 0)
3583 } else if (!rdev->mddev->external) {
3586 rdev->ppl.size = size;
3590 static struct rdev_sysfs_entry rdev_ppl_size =
3591 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3593 static struct attribute *rdev_default_attrs[] = {
3598 &rdev_new_offset.attr,
3600 &rdev_recovery_start.attr,
3601 &rdev_bad_blocks.attr,
3602 &rdev_unack_bad_blocks.attr,
3603 &rdev_ppl_sector.attr,
3604 &rdev_ppl_size.attr,
3608 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3610 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3611 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3617 return entry->show(rdev, page);
3621 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3622 const char *page, size_t length)
3624 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3625 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3627 struct mddev *mddev = rdev->mddev;
3631 if (!capable(CAP_SYS_ADMIN))
3633 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3635 if (rdev->mddev == NULL)
3638 rv = entry->store(rdev, page, length);
3639 mddev_unlock(mddev);
3644 static void rdev_free(struct kobject *ko)
3646 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3649 static const struct sysfs_ops rdev_sysfs_ops = {
3650 .show = rdev_attr_show,
3651 .store = rdev_attr_store,
3653 static struct kobj_type rdev_ktype = {
3654 .release = rdev_free,
3655 .sysfs_ops = &rdev_sysfs_ops,
3656 .default_attrs = rdev_default_attrs,
3659 int md_rdev_init(struct md_rdev *rdev)
3662 rdev->saved_raid_disk = -1;
3663 rdev->raid_disk = -1;
3665 rdev->data_offset = 0;
3666 rdev->new_data_offset = 0;
3667 rdev->sb_events = 0;
3668 rdev->last_read_error = 0;
3669 rdev->sb_loaded = 0;
3670 rdev->bb_page = NULL;
3671 atomic_set(&rdev->nr_pending, 0);
3672 atomic_set(&rdev->read_errors, 0);
3673 atomic_set(&rdev->corrected_errors, 0);
3675 INIT_LIST_HEAD(&rdev->same_set);
3676 init_waitqueue_head(&rdev->blocked_wait);
3678 /* Add space to store bad block list.
3679 * This reserves the space even on arrays where it cannot
3680 * be used - I wonder if that matters
3682 return badblocks_init(&rdev->badblocks, 0);
3684 EXPORT_SYMBOL_GPL(md_rdev_init);
3686 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3688 * mark the device faulty if:
3690 * - the device is nonexistent (zero size)
3691 * - the device has no valid superblock
3693 * a faulty rdev _never_ has rdev->sb set.
3695 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3697 char b[BDEVNAME_SIZE];
3699 struct md_rdev *rdev;
3702 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3704 return ERR_PTR(-ENOMEM);
3706 err = md_rdev_init(rdev);
3709 err = alloc_disk_sb(rdev);
3713 err = lock_rdev(rdev, newdev, super_format == -2);
3717 kobject_init(&rdev->kobj, &rdev_ktype);
3719 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3721 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3722 bdevname(rdev->bdev,b));
3727 if (super_format >= 0) {
3728 err = super_types[super_format].
3729 load_super(rdev, NULL, super_minor);
3730 if (err == -EINVAL) {
3731 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3732 bdevname(rdev->bdev,b),
3733 super_format, super_minor);
3737 pr_warn("md: could not read %s's sb, not importing!\n",
3738 bdevname(rdev->bdev,b));
3748 md_rdev_clear(rdev);
3750 return ERR_PTR(err);
3754 * Check a full RAID array for plausibility
3757 static int analyze_sbs(struct mddev *mddev)
3760 struct md_rdev *rdev, *freshest, *tmp;
3761 char b[BDEVNAME_SIZE];
3764 rdev_for_each_safe(rdev, tmp, mddev)
3765 switch (super_types[mddev->major_version].
3766 load_super(rdev, freshest, mddev->minor_version)) {
3773 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3774 bdevname(rdev->bdev,b));
3775 md_kick_rdev_from_array(rdev);
3778 /* Cannot find a valid fresh disk */
3780 pr_warn("md: cannot find a valid disk\n");
3784 super_types[mddev->major_version].
3785 validate_super(mddev, freshest);
3788 rdev_for_each_safe(rdev, tmp, mddev) {
3789 if (mddev->max_disks &&
3790 (rdev->desc_nr >= mddev->max_disks ||
3791 i > mddev->max_disks)) {
3792 pr_warn("md: %s: %s: only %d devices permitted\n",
3793 mdname(mddev), bdevname(rdev->bdev, b),
3795 md_kick_rdev_from_array(rdev);
3798 if (rdev != freshest) {
3799 if (super_types[mddev->major_version].
3800 validate_super(mddev, rdev)) {
3801 pr_warn("md: kicking non-fresh %s from array!\n",
3802 bdevname(rdev->bdev,b));
3803 md_kick_rdev_from_array(rdev);
3807 if (mddev->level == LEVEL_MULTIPATH) {
3808 rdev->desc_nr = i++;
3809 rdev->raid_disk = rdev->desc_nr;
3810 set_bit(In_sync, &rdev->flags);
3811 } else if (rdev->raid_disk >=
3812 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3813 !test_bit(Journal, &rdev->flags)) {
3814 rdev->raid_disk = -1;
3815 clear_bit(In_sync, &rdev->flags);
3822 /* Read a fixed-point number.
3823 * Numbers in sysfs attributes should be in "standard" units where
3824 * possible, so time should be in seconds.
3825 * However we internally use a a much smaller unit such as
3826 * milliseconds or jiffies.
3827 * This function takes a decimal number with a possible fractional
3828 * component, and produces an integer which is the result of
3829 * multiplying that number by 10^'scale'.
3830 * all without any floating-point arithmetic.
3832 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3834 unsigned long result = 0;
3836 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3839 else if (decimals < scale) {
3842 result = result * 10 + value;
3854 *res = result * int_pow(10, scale - decimals);
3859 safe_delay_show(struct mddev *mddev, char *page)
3861 int msec = (mddev->safemode_delay*1000)/HZ;
3862 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3865 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3869 if (mddev_is_clustered(mddev)) {
3870 pr_warn("md: Safemode is disabled for clustered mode\n");
3874 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3877 mddev->safemode_delay = 0;
3879 unsigned long old_delay = mddev->safemode_delay;
3880 unsigned long new_delay = (msec*HZ)/1000;
3884 mddev->safemode_delay = new_delay;
3885 if (new_delay < old_delay || old_delay == 0)
3886 mod_timer(&mddev->safemode_timer, jiffies+1);
3890 static struct md_sysfs_entry md_safe_delay =
3891 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3894 level_show(struct mddev *mddev, char *page)
3896 struct md_personality *p;
3898 spin_lock(&mddev->lock);
3901 ret = sprintf(page, "%s\n", p->name);
3902 else if (mddev->clevel[0])
3903 ret = sprintf(page, "%s\n", mddev->clevel);
3904 else if (mddev->level != LEVEL_NONE)
3905 ret = sprintf(page, "%d\n", mddev->level);
3908 spin_unlock(&mddev->lock);
3913 level_store(struct mddev *mddev, const char *buf, size_t len)
3918 struct md_personality *pers, *oldpers;
3920 void *priv, *oldpriv;
3921 struct md_rdev *rdev;
3923 if (slen == 0 || slen >= sizeof(clevel))
3926 rv = mddev_lock(mddev);
3930 if (mddev->pers == NULL) {
3931 strncpy(mddev->clevel, buf, slen);
3932 if (mddev->clevel[slen-1] == '\n')
3934 mddev->clevel[slen] = 0;
3935 mddev->level = LEVEL_NONE;
3943 /* request to change the personality. Need to ensure:
3944 * - array is not engaged in resync/recovery/reshape
3945 * - old personality can be suspended
3946 * - new personality will access other array.
3950 if (mddev->sync_thread ||
3951 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3952 mddev->reshape_position != MaxSector ||
3953 mddev->sysfs_active)
3957 if (!mddev->pers->quiesce) {
3958 pr_warn("md: %s: %s does not support online personality change\n",
3959 mdname(mddev), mddev->pers->name);
3963 /* Now find the new personality */
3964 strncpy(clevel, buf, slen);
3965 if (clevel[slen-1] == '\n')
3968 if (kstrtol(clevel, 10, &level))
3971 if (request_module("md-%s", clevel) != 0)
3972 request_module("md-level-%s", clevel);
3973 spin_lock(&pers_lock);
3974 pers = find_pers(level, clevel);
3975 if (!pers || !try_module_get(pers->owner)) {
3976 spin_unlock(&pers_lock);
3977 pr_warn("md: personality %s not loaded\n", clevel);
3981 spin_unlock(&pers_lock);
3983 if (pers == mddev->pers) {
3984 /* Nothing to do! */
3985 module_put(pers->owner);
3989 if (!pers->takeover) {
3990 module_put(pers->owner);
3991 pr_warn("md: %s: %s does not support personality takeover\n",
3992 mdname(mddev), clevel);
3997 rdev_for_each(rdev, mddev)
3998 rdev->new_raid_disk = rdev->raid_disk;
4000 /* ->takeover must set new_* and/or delta_disks
4001 * if it succeeds, and may set them when it fails.
4003 priv = pers->takeover(mddev);
4005 mddev->new_level = mddev->level;
4006 mddev->new_layout = mddev->layout;
4007 mddev->new_chunk_sectors = mddev->chunk_sectors;
4008 mddev->raid_disks -= mddev->delta_disks;
4009 mddev->delta_disks = 0;
4010 mddev->reshape_backwards = 0;
4011 module_put(pers->owner);
4012 pr_warn("md: %s: %s would not accept array\n",
4013 mdname(mddev), clevel);
4018 /* Looks like we have a winner */
4019 mddev_suspend(mddev);
4020 mddev_detach(mddev);
4022 spin_lock(&mddev->lock);
4023 oldpers = mddev->pers;
4024 oldpriv = mddev->private;
4026 mddev->private = priv;
4027 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4028 mddev->level = mddev->new_level;
4029 mddev->layout = mddev->new_layout;
4030 mddev->chunk_sectors = mddev->new_chunk_sectors;
4031 mddev->delta_disks = 0;
4032 mddev->reshape_backwards = 0;
4033 mddev->degraded = 0;
4034 spin_unlock(&mddev->lock);
4036 if (oldpers->sync_request == NULL &&
4038 /* We are converting from a no-redundancy array
4039 * to a redundancy array and metadata is managed
4040 * externally so we need to be sure that writes
4041 * won't block due to a need to transition
4043 * until external management is started.
4046 mddev->safemode_delay = 0;
4047 mddev->safemode = 0;
4050 oldpers->free(mddev, oldpriv);
4052 if (oldpers->sync_request == NULL &&
4053 pers->sync_request != NULL) {
4054 /* need to add the md_redundancy_group */
4055 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4056 pr_warn("md: cannot register extra attributes for %s\n",
4058 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
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(&mddev->kobj, NULL, "level");
4107 md_new_event(mddev);
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 chunk_size_show(struct mddev *mddev, char *page)
4221 if (mddev->reshape_position != MaxSector &&
4222 mddev->chunk_sectors != mddev->new_chunk_sectors)
4223 return sprintf(page, "%d (%d)\n",
4224 mddev->new_chunk_sectors << 9,
4225 mddev->chunk_sectors << 9);
4226 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4230 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4235 err = kstrtoul(buf, 10, &n);
4239 err = mddev_lock(mddev);
4243 if (mddev->pers->check_reshape == NULL)
4248 mddev->new_chunk_sectors = n >> 9;
4249 err = mddev->pers->check_reshape(mddev);
4251 mddev->new_chunk_sectors = mddev->chunk_sectors;
4254 mddev->new_chunk_sectors = n >> 9;
4255 if (mddev->reshape_position == MaxSector)
4256 mddev->chunk_sectors = n >> 9;
4258 mddev_unlock(mddev);
4261 static struct md_sysfs_entry md_chunk_size =
4262 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4265 resync_start_show(struct mddev *mddev, char *page)
4267 if (mddev->recovery_cp == MaxSector)
4268 return sprintf(page, "none\n");
4269 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4273 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4275 unsigned long long n;
4278 if (cmd_match(buf, "none"))
4281 err = kstrtoull(buf, 10, &n);
4284 if (n != (sector_t)n)
4288 err = mddev_lock(mddev);
4291 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4295 mddev->recovery_cp = n;
4297 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4299 mddev_unlock(mddev);
4302 static struct md_sysfs_entry md_resync_start =
4303 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4304 resync_start_show, resync_start_store);
4307 * The array state can be:
4310 * No devices, no size, no level
4311 * Equivalent to STOP_ARRAY ioctl
4313 * May have some settings, but array is not active
4314 * all IO results in error
4315 * When written, doesn't tear down array, but just stops it
4316 * suspended (not supported yet)
4317 * All IO requests will block. The array can be reconfigured.
4318 * Writing this, if accepted, will block until array is quiescent
4320 * no resync can happen. no superblocks get written.
4321 * write requests fail
4323 * like readonly, but behaves like 'clean' on a write request.
4325 * clean - no pending writes, but otherwise active.
4326 * When written to inactive array, starts without resync
4327 * If a write request arrives then
4328 * if metadata is known, mark 'dirty' and switch to 'active'.
4329 * if not known, block and switch to write-pending
4330 * If written to an active array that has pending writes, then fails.
4332 * fully active: IO and resync can be happening.
4333 * When written to inactive array, starts with resync
4336 * clean, but writes are blocked waiting for 'active' to be written.
4339 * like active, but no writes have been seen for a while (100msec).
4342 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4343 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4344 * when a member is gone, so this state will at least alert the
4345 * user that something is wrong.
4347 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4348 write_pending, active_idle, broken, bad_word};
4349 static char *array_states[] = {
4350 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4351 "write-pending", "active-idle", "broken", NULL };
4353 static int match_word(const char *word, char **list)
4356 for (n=0; list[n]; n++)
4357 if (cmd_match(word, list[n]))
4363 array_state_show(struct mddev *mddev, char *page)
4365 enum array_state st = inactive;
4367 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4376 spin_lock(&mddev->lock);
4377 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4379 else if (mddev->in_sync)
4381 else if (mddev->safemode)
4385 spin_unlock(&mddev->lock);
4388 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4391 if (list_empty(&mddev->disks) &&
4392 mddev->raid_disks == 0 &&
4393 mddev->dev_sectors == 0)
4398 return sprintf(page, "%s\n", array_states[st]);
4401 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4402 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4403 static int do_md_run(struct mddev *mddev);
4404 static int restart_array(struct mddev *mddev);
4407 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4410 enum array_state st = match_word(buf, array_states);
4412 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4413 /* don't take reconfig_mutex when toggling between
4416 spin_lock(&mddev->lock);
4418 restart_array(mddev);
4419 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4420 md_wakeup_thread(mddev->thread);
4421 wake_up(&mddev->sb_wait);
4422 } else /* st == clean */ {
4423 restart_array(mddev);
4424 if (!set_in_sync(mddev))
4428 sysfs_notify_dirent_safe(mddev->sysfs_state);
4429 spin_unlock(&mddev->lock);
4432 err = mddev_lock(mddev);
4440 /* stopping an active array */
4441 err = do_md_stop(mddev, 0, NULL);
4444 /* stopping an active array */
4446 err = do_md_stop(mddev, 2, NULL);
4448 err = 0; /* already inactive */
4451 break; /* not supported yet */
4454 err = md_set_readonly(mddev, NULL);
4457 set_disk_ro(mddev->gendisk, 1);
4458 err = do_md_run(mddev);
4464 err = md_set_readonly(mddev, NULL);
4465 else if (mddev->ro == 1)
4466 err = restart_array(mddev);
4469 set_disk_ro(mddev->gendisk, 0);
4473 err = do_md_run(mddev);
4478 err = restart_array(mddev);
4481 spin_lock(&mddev->lock);
4482 if (!set_in_sync(mddev))
4484 spin_unlock(&mddev->lock);
4490 err = restart_array(mddev);
4493 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4494 wake_up(&mddev->sb_wait);
4498 set_disk_ro(mddev->gendisk, 0);
4499 err = do_md_run(mddev);
4505 /* these cannot be set */
4510 if (mddev->hold_active == UNTIL_IOCTL)
4511 mddev->hold_active = 0;
4512 sysfs_notify_dirent_safe(mddev->sysfs_state);
4514 mddev_unlock(mddev);
4517 static struct md_sysfs_entry md_array_state =
4518 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4521 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4522 return sprintf(page, "%d\n",
4523 atomic_read(&mddev->max_corr_read_errors));
4527 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4532 rv = kstrtouint(buf, 10, &n);
4535 atomic_set(&mddev->max_corr_read_errors, n);
4539 static struct md_sysfs_entry max_corr_read_errors =
4540 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4541 max_corrected_read_errors_store);
4544 null_show(struct mddev *mddev, char *page)
4549 /* need to ensure rdev_delayed_delete() has completed */
4550 static void flush_rdev_wq(struct mddev *mddev)
4552 struct md_rdev *rdev;
4555 rdev_for_each_rcu(rdev, mddev)
4556 if (work_pending(&rdev->del_work)) {
4557 flush_workqueue(md_rdev_misc_wq);
4564 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4566 /* buf must be %d:%d\n? giving major and minor numbers */
4567 /* The new device is added to the array.
4568 * If the array has a persistent superblock, we read the
4569 * superblock to initialise info and check validity.
4570 * Otherwise, only checking done is that in bind_rdev_to_array,
4571 * which mainly checks size.
4574 int major = simple_strtoul(buf, &e, 10);
4577 struct md_rdev *rdev;
4580 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4582 minor = simple_strtoul(e+1, &e, 10);
4583 if (*e && *e != '\n')
4585 dev = MKDEV(major, minor);
4586 if (major != MAJOR(dev) ||
4587 minor != MINOR(dev))
4590 flush_rdev_wq(mddev);
4591 err = mddev_lock(mddev);
4594 if (mddev->persistent) {
4595 rdev = md_import_device(dev, mddev->major_version,
4596 mddev->minor_version);
4597 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4598 struct md_rdev *rdev0
4599 = list_entry(mddev->disks.next,
4600 struct md_rdev, same_set);
4601 err = super_types[mddev->major_version]
4602 .load_super(rdev, rdev0, mddev->minor_version);
4606 } else if (mddev->external)
4607 rdev = md_import_device(dev, -2, -1);
4609 rdev = md_import_device(dev, -1, -1);
4612 mddev_unlock(mddev);
4613 return PTR_ERR(rdev);
4615 err = bind_rdev_to_array(rdev, mddev);
4619 mddev_unlock(mddev);
4621 md_new_event(mddev);
4622 return err ? err : len;
4625 static struct md_sysfs_entry md_new_device =
4626 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4629 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4632 unsigned long chunk, end_chunk;
4635 err = mddev_lock(mddev);
4640 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4642 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4643 if (buf == end) break;
4644 if (*end == '-') { /* range */
4646 end_chunk = simple_strtoul(buf, &end, 0);
4647 if (buf == end) break;
4649 if (*end && !isspace(*end)) break;
4650 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4651 buf = skip_spaces(end);
4653 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4655 mddev_unlock(mddev);
4659 static struct md_sysfs_entry md_bitmap =
4660 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4663 size_show(struct mddev *mddev, char *page)
4665 return sprintf(page, "%llu\n",
4666 (unsigned long long)mddev->dev_sectors / 2);
4669 static int update_size(struct mddev *mddev, sector_t num_sectors);
4672 size_store(struct mddev *mddev, const char *buf, size_t len)
4674 /* If array is inactive, we can reduce the component size, but
4675 * not increase it (except from 0).
4676 * If array is active, we can try an on-line resize
4679 int err = strict_blocks_to_sectors(buf, §ors);
4683 err = mddev_lock(mddev);
4687 err = update_size(mddev, sectors);
4689 md_update_sb(mddev, 1);
4691 if (mddev->dev_sectors == 0 ||
4692 mddev->dev_sectors > sectors)
4693 mddev->dev_sectors = sectors;
4697 mddev_unlock(mddev);
4698 return err ? err : len;
4701 static struct md_sysfs_entry md_size =
4702 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4704 /* Metadata version.
4706 * 'none' for arrays with no metadata (good luck...)
4707 * 'external' for arrays with externally managed metadata,
4708 * or N.M for internally known formats
4711 metadata_show(struct mddev *mddev, char *page)
4713 if (mddev->persistent)
4714 return sprintf(page, "%d.%d\n",
4715 mddev->major_version, mddev->minor_version);
4716 else if (mddev->external)
4717 return sprintf(page, "external:%s\n", mddev->metadata_type);
4719 return sprintf(page, "none\n");
4723 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4728 /* Changing the details of 'external' metadata is
4729 * always permitted. Otherwise there must be
4730 * no devices attached to the array.
4733 err = mddev_lock(mddev);
4737 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4739 else if (!list_empty(&mddev->disks))
4743 if (cmd_match(buf, "none")) {
4744 mddev->persistent = 0;
4745 mddev->external = 0;
4746 mddev->major_version = 0;
4747 mddev->minor_version = 90;
4750 if (strncmp(buf, "external:", 9) == 0) {
4751 size_t namelen = len-9;
4752 if (namelen >= sizeof(mddev->metadata_type))
4753 namelen = sizeof(mddev->metadata_type)-1;
4754 strncpy(mddev->metadata_type, buf+9, namelen);
4755 mddev->metadata_type[namelen] = 0;
4756 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4757 mddev->metadata_type[--namelen] = 0;
4758 mddev->persistent = 0;
4759 mddev->external = 1;
4760 mddev->major_version = 0;
4761 mddev->minor_version = 90;
4764 major = simple_strtoul(buf, &e, 10);
4766 if (e==buf || *e != '.')
4769 minor = simple_strtoul(buf, &e, 10);
4770 if (e==buf || (*e && *e != '\n') )
4773 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4775 mddev->major_version = major;
4776 mddev->minor_version = minor;
4777 mddev->persistent = 1;
4778 mddev->external = 0;
4781 mddev_unlock(mddev);
4785 static struct md_sysfs_entry md_metadata =
4786 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4789 action_show(struct mddev *mddev, char *page)
4791 char *type = "idle";
4792 unsigned long recovery = mddev->recovery;
4793 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4795 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4796 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4797 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4799 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4800 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4802 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4806 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4808 else if (mddev->reshape_position != MaxSector)
4811 return sprintf(page, "%s\n", type);
4815 action_store(struct mddev *mddev, const char *page, size_t len)
4817 if (!mddev->pers || !mddev->pers->sync_request)
4821 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4822 if (cmd_match(page, "frozen"))
4823 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4825 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4826 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4827 mddev_lock(mddev) == 0) {
4828 if (work_pending(&mddev->del_work))
4829 flush_workqueue(md_misc_wq);
4830 if (mddev->sync_thread) {
4831 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4832 md_reap_sync_thread(mddev);
4834 mddev_unlock(mddev);
4836 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4838 else if (cmd_match(page, "resync"))
4839 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4840 else if (cmd_match(page, "recover")) {
4841 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4842 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4843 } else if (cmd_match(page, "reshape")) {
4845 if (mddev->pers->start_reshape == NULL)
4847 err = mddev_lock(mddev);
4849 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4852 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4853 err = mddev->pers->start_reshape(mddev);
4855 mddev_unlock(mddev);
4859 sysfs_notify(&mddev->kobj, NULL, "degraded");
4861 if (cmd_match(page, "check"))
4862 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4863 else if (!cmd_match(page, "repair"))
4865 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4866 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4867 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4869 if (mddev->ro == 2) {
4870 /* A write to sync_action is enough to justify
4871 * canceling read-auto mode
4874 md_wakeup_thread(mddev->sync_thread);
4876 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4877 md_wakeup_thread(mddev->thread);
4878 sysfs_notify_dirent_safe(mddev->sysfs_action);
4882 static struct md_sysfs_entry md_scan_mode =
4883 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4886 last_sync_action_show(struct mddev *mddev, char *page)
4888 return sprintf(page, "%s\n", mddev->last_sync_action);
4891 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4894 mismatch_cnt_show(struct mddev *mddev, char *page)
4896 return sprintf(page, "%llu\n",
4897 (unsigned long long)
4898 atomic64_read(&mddev->resync_mismatches));
4901 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4904 sync_min_show(struct mddev *mddev, char *page)
4906 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4907 mddev->sync_speed_min ? "local": "system");
4911 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4916 if (strncmp(buf, "system", 6)==0) {
4919 rv = kstrtouint(buf, 10, &min);
4925 mddev->sync_speed_min = min;
4929 static struct md_sysfs_entry md_sync_min =
4930 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4933 sync_max_show(struct mddev *mddev, char *page)
4935 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4936 mddev->sync_speed_max ? "local": "system");
4940 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4945 if (strncmp(buf, "system", 6)==0) {
4948 rv = kstrtouint(buf, 10, &max);
4954 mddev->sync_speed_max = max;
4958 static struct md_sysfs_entry md_sync_max =
4959 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4962 degraded_show(struct mddev *mddev, char *page)
4964 return sprintf(page, "%d\n", mddev->degraded);
4966 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4969 sync_force_parallel_show(struct mddev *mddev, char *page)
4971 return sprintf(page, "%d\n", mddev->parallel_resync);
4975 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4979 if (kstrtol(buf, 10, &n))
4982 if (n != 0 && n != 1)
4985 mddev->parallel_resync = n;
4987 if (mddev->sync_thread)
4988 wake_up(&resync_wait);
4993 /* force parallel resync, even with shared block devices */
4994 static struct md_sysfs_entry md_sync_force_parallel =
4995 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4996 sync_force_parallel_show, sync_force_parallel_store);
4999 sync_speed_show(struct mddev *mddev, char *page)
5001 unsigned long resync, dt, db;
5002 if (mddev->curr_resync == 0)
5003 return sprintf(page, "none\n");
5004 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5005 dt = (jiffies - mddev->resync_mark) / HZ;
5007 db = resync - mddev->resync_mark_cnt;
5008 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5011 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5014 sync_completed_show(struct mddev *mddev, char *page)
5016 unsigned long long max_sectors, resync;
5018 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5019 return sprintf(page, "none\n");
5021 if (mddev->curr_resync == 1 ||
5022 mddev->curr_resync == 2)
5023 return sprintf(page, "delayed\n");
5025 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5026 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5027 max_sectors = mddev->resync_max_sectors;
5029 max_sectors = mddev->dev_sectors;
5031 resync = mddev->curr_resync_completed;
5032 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5035 static struct md_sysfs_entry md_sync_completed =
5036 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5039 min_sync_show(struct mddev *mddev, char *page)
5041 return sprintf(page, "%llu\n",
5042 (unsigned long long)mddev->resync_min);
5045 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5047 unsigned long long min;
5050 if (kstrtoull(buf, 10, &min))
5053 spin_lock(&mddev->lock);
5055 if (min > mddev->resync_max)
5059 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5062 /* Round down to multiple of 4K for safety */
5063 mddev->resync_min = round_down(min, 8);
5067 spin_unlock(&mddev->lock);
5071 static struct md_sysfs_entry md_min_sync =
5072 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5075 max_sync_show(struct mddev *mddev, char *page)
5077 if (mddev->resync_max == MaxSector)
5078 return sprintf(page, "max\n");
5080 return sprintf(page, "%llu\n",
5081 (unsigned long long)mddev->resync_max);
5084 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5087 spin_lock(&mddev->lock);
5088 if (strncmp(buf, "max", 3) == 0)
5089 mddev->resync_max = MaxSector;
5091 unsigned long long max;
5095 if (kstrtoull(buf, 10, &max))
5097 if (max < mddev->resync_min)
5101 if (max < mddev->resync_max &&
5103 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5106 /* Must be a multiple of chunk_size */
5107 chunk = mddev->chunk_sectors;
5109 sector_t temp = max;
5112 if (sector_div(temp, chunk))
5115 mddev->resync_max = max;
5117 wake_up(&mddev->recovery_wait);
5120 spin_unlock(&mddev->lock);
5124 static struct md_sysfs_entry md_max_sync =
5125 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5128 suspend_lo_show(struct mddev *mddev, char *page)
5130 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5134 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5136 unsigned long long new;
5139 err = kstrtoull(buf, 10, &new);
5142 if (new != (sector_t)new)
5145 err = mddev_lock(mddev);
5149 if (mddev->pers == NULL ||
5150 mddev->pers->quiesce == NULL)
5152 mddev_suspend(mddev);
5153 mddev->suspend_lo = new;
5154 mddev_resume(mddev);
5158 mddev_unlock(mddev);
5161 static struct md_sysfs_entry md_suspend_lo =
5162 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5165 suspend_hi_show(struct mddev *mddev, char *page)
5167 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5171 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5173 unsigned long long new;
5176 err = kstrtoull(buf, 10, &new);
5179 if (new != (sector_t)new)
5182 err = mddev_lock(mddev);
5186 if (mddev->pers == NULL)
5189 mddev_suspend(mddev);
5190 mddev->suspend_hi = new;
5191 mddev_resume(mddev);
5195 mddev_unlock(mddev);
5198 static struct md_sysfs_entry md_suspend_hi =
5199 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5202 reshape_position_show(struct mddev *mddev, char *page)
5204 if (mddev->reshape_position != MaxSector)
5205 return sprintf(page, "%llu\n",
5206 (unsigned long long)mddev->reshape_position);
5207 strcpy(page, "none\n");
5212 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5214 struct md_rdev *rdev;
5215 unsigned long long new;
5218 err = kstrtoull(buf, 10, &new);
5221 if (new != (sector_t)new)
5223 err = mddev_lock(mddev);
5229 mddev->reshape_position = new;
5230 mddev->delta_disks = 0;
5231 mddev->reshape_backwards = 0;
5232 mddev->new_level = mddev->level;
5233 mddev->new_layout = mddev->layout;
5234 mddev->new_chunk_sectors = mddev->chunk_sectors;
5235 rdev_for_each(rdev, mddev)
5236 rdev->new_data_offset = rdev->data_offset;
5239 mddev_unlock(mddev);
5243 static struct md_sysfs_entry md_reshape_position =
5244 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5245 reshape_position_store);
5248 reshape_direction_show(struct mddev *mddev, char *page)
5250 return sprintf(page, "%s\n",
5251 mddev->reshape_backwards ? "backwards" : "forwards");
5255 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5260 if (cmd_match(buf, "forwards"))
5262 else if (cmd_match(buf, "backwards"))
5266 if (mddev->reshape_backwards == backwards)
5269 err = mddev_lock(mddev);
5272 /* check if we are allowed to change */
5273 if (mddev->delta_disks)
5275 else if (mddev->persistent &&
5276 mddev->major_version == 0)
5279 mddev->reshape_backwards = backwards;
5280 mddev_unlock(mddev);
5284 static struct md_sysfs_entry md_reshape_direction =
5285 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5286 reshape_direction_store);
5289 array_size_show(struct mddev *mddev, char *page)
5291 if (mddev->external_size)
5292 return sprintf(page, "%llu\n",
5293 (unsigned long long)mddev->array_sectors/2);
5295 return sprintf(page, "default\n");
5299 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5304 err = mddev_lock(mddev);
5308 /* cluster raid doesn't support change array_sectors */
5309 if (mddev_is_clustered(mddev)) {
5310 mddev_unlock(mddev);
5314 if (strncmp(buf, "default", 7) == 0) {
5316 sectors = mddev->pers->size(mddev, 0, 0);
5318 sectors = mddev->array_sectors;
5320 mddev->external_size = 0;
5322 if (strict_blocks_to_sectors(buf, §ors) < 0)
5324 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5327 mddev->external_size = 1;
5331 mddev->array_sectors = sectors;
5333 set_capacity(mddev->gendisk, mddev->array_sectors);
5334 revalidate_disk(mddev->gendisk);
5337 mddev_unlock(mddev);
5341 static struct md_sysfs_entry md_array_size =
5342 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5346 consistency_policy_show(struct mddev *mddev, char *page)
5350 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5351 ret = sprintf(page, "journal\n");
5352 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5353 ret = sprintf(page, "ppl\n");
5354 } else if (mddev->bitmap) {
5355 ret = sprintf(page, "bitmap\n");
5356 } else if (mddev->pers) {
5357 if (mddev->pers->sync_request)
5358 ret = sprintf(page, "resync\n");
5360 ret = sprintf(page, "none\n");
5362 ret = sprintf(page, "unknown\n");
5369 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5374 if (mddev->pers->change_consistency_policy)
5375 err = mddev->pers->change_consistency_policy(mddev, buf);
5378 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5379 set_bit(MD_HAS_PPL, &mddev->flags);
5384 return err ? err : len;
5387 static struct md_sysfs_entry md_consistency_policy =
5388 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5389 consistency_policy_store);
5391 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5393 return sprintf(page, "%d\n", mddev->fail_last_dev);
5397 * Setting fail_last_dev to true to allow last device to be forcibly removed
5398 * from RAID1/RAID10.
5401 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5406 ret = kstrtobool(buf, &value);
5410 if (value != mddev->fail_last_dev)
5411 mddev->fail_last_dev = value;
5415 static struct md_sysfs_entry md_fail_last_dev =
5416 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5417 fail_last_dev_store);
5419 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5421 if (mddev->pers == NULL || (mddev->pers->level != 1))
5422 return sprintf(page, "n/a\n");
5424 return sprintf(page, "%d\n", mddev->serialize_policy);
5428 * Setting serialize_policy to true to enforce write IO is not reordered
5432 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5437 err = kstrtobool(buf, &value);
5441 if (value == mddev->serialize_policy)
5444 err = mddev_lock(mddev);
5447 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5448 pr_err("md: serialize_policy is only effective for raid1\n");
5453 mddev_suspend(mddev);
5455 mddev_create_serial_pool(mddev, NULL, true);
5457 mddev_destroy_serial_pool(mddev, NULL, true);
5458 mddev->serialize_policy = value;
5459 mddev_resume(mddev);
5461 mddev_unlock(mddev);
5465 static struct md_sysfs_entry md_serialize_policy =
5466 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5467 serialize_policy_store);
5470 static struct attribute *md_default_attrs[] = {
5473 &md_raid_disks.attr,
5474 &md_chunk_size.attr,
5476 &md_resync_start.attr,
5478 &md_new_device.attr,
5479 &md_safe_delay.attr,
5480 &md_array_state.attr,
5481 &md_reshape_position.attr,
5482 &md_reshape_direction.attr,
5483 &md_array_size.attr,
5484 &max_corr_read_errors.attr,
5485 &md_consistency_policy.attr,
5486 &md_fail_last_dev.attr,
5487 &md_serialize_policy.attr,
5491 static struct attribute *md_redundancy_attrs[] = {
5493 &md_last_scan_mode.attr,
5494 &md_mismatches.attr,
5497 &md_sync_speed.attr,
5498 &md_sync_force_parallel.attr,
5499 &md_sync_completed.attr,
5502 &md_suspend_lo.attr,
5503 &md_suspend_hi.attr,
5508 static struct attribute_group md_redundancy_group = {
5510 .attrs = md_redundancy_attrs,
5514 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5516 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5517 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5522 spin_lock(&all_mddevs_lock);
5523 if (list_empty(&mddev->all_mddevs)) {
5524 spin_unlock(&all_mddevs_lock);
5528 spin_unlock(&all_mddevs_lock);
5530 rv = entry->show(mddev, page);
5536 md_attr_store(struct kobject *kobj, struct attribute *attr,
5537 const char *page, size_t length)
5539 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5540 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5545 if (!capable(CAP_SYS_ADMIN))
5547 spin_lock(&all_mddevs_lock);
5548 if (list_empty(&mddev->all_mddevs)) {
5549 spin_unlock(&all_mddevs_lock);
5553 spin_unlock(&all_mddevs_lock);
5554 rv = entry->store(mddev, page, length);
5559 static void md_free(struct kobject *ko)
5561 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5563 if (mddev->sysfs_state)
5564 sysfs_put(mddev->sysfs_state);
5567 del_gendisk(mddev->gendisk);
5569 blk_cleanup_queue(mddev->queue);
5571 put_disk(mddev->gendisk);
5572 percpu_ref_exit(&mddev->writes_pending);
5574 bioset_exit(&mddev->bio_set);
5575 bioset_exit(&mddev->sync_set);
5576 mempool_exit(&mddev->md_io_pool);
5580 static const struct sysfs_ops md_sysfs_ops = {
5581 .show = md_attr_show,
5582 .store = md_attr_store,
5584 static struct kobj_type md_ktype = {
5586 .sysfs_ops = &md_sysfs_ops,
5587 .default_attrs = md_default_attrs,
5592 static void mddev_delayed_delete(struct work_struct *ws)
5594 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5596 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5597 kobject_del(&mddev->kobj);
5598 kobject_put(&mddev->kobj);
5601 static void no_op(struct percpu_ref *r) {}
5603 int mddev_init_writes_pending(struct mddev *mddev)
5605 if (mddev->writes_pending.percpu_count_ptr)
5607 if (percpu_ref_init(&mddev->writes_pending, no_op,
5608 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5610 /* We want to start with the refcount at zero */
5611 percpu_ref_put(&mddev->writes_pending);
5614 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5616 static int md_alloc(dev_t dev, char *name)
5619 * If dev is zero, name is the name of a device to allocate with
5620 * an arbitrary minor number. It will be "md_???"
5621 * If dev is non-zero it must be a device number with a MAJOR of
5622 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5623 * the device is being created by opening a node in /dev.
5624 * If "name" is not NULL, the device is being created by
5625 * writing to /sys/module/md_mod/parameters/new_array.
5627 static DEFINE_MUTEX(disks_mutex);
5628 struct mddev *mddev = mddev_find(dev);
5629 struct gendisk *disk;
5638 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5639 shift = partitioned ? MdpMinorShift : 0;
5640 unit = MINOR(mddev->unit) >> shift;
5642 /* wait for any previous instance of this device to be
5643 * completely removed (mddev_delayed_delete).
5645 flush_workqueue(md_misc_wq);
5647 mutex_lock(&disks_mutex);
5653 /* Need to ensure that 'name' is not a duplicate.
5655 struct mddev *mddev2;
5656 spin_lock(&all_mddevs_lock);
5658 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5659 if (mddev2->gendisk &&
5660 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5661 spin_unlock(&all_mddevs_lock);
5664 spin_unlock(&all_mddevs_lock);
5668 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5670 mddev->hold_active = UNTIL_STOP;
5672 error = mempool_init_kmalloc_pool(&mddev->md_io_pool, BIO_POOL_SIZE,
5673 sizeof(struct md_io));
5678 mddev->queue = blk_alloc_queue(NUMA_NO_NODE);
5682 blk_set_stacking_limits(&mddev->queue->limits);
5684 disk = alloc_disk(1 << shift);
5686 blk_cleanup_queue(mddev->queue);
5687 mddev->queue = NULL;
5690 disk->major = MAJOR(mddev->unit);
5691 disk->first_minor = unit << shift;
5693 strcpy(disk->disk_name, name);
5694 else if (partitioned)
5695 sprintf(disk->disk_name, "md_d%d", unit);
5697 sprintf(disk->disk_name, "md%d", unit);
5698 disk->fops = &md_fops;
5699 disk->private_data = mddev;
5700 disk->queue = mddev->queue;
5701 blk_queue_write_cache(mddev->queue, true, true);
5702 /* Allow extended partitions. This makes the
5703 * 'mdp' device redundant, but we can't really
5706 disk->flags |= GENHD_FL_EXT_DEVT;
5707 mddev->gendisk = disk;
5708 /* As soon as we call add_disk(), another thread could get
5709 * through to md_open, so make sure it doesn't get too far
5711 mutex_lock(&mddev->open_mutex);
5714 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5716 /* This isn't possible, but as kobject_init_and_add is marked
5717 * __must_check, we must do something with the result
5719 pr_debug("md: cannot register %s/md - name in use\n",
5723 if (mddev->kobj.sd &&
5724 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5725 pr_debug("pointless warning\n");
5726 mutex_unlock(&mddev->open_mutex);
5728 mutex_unlock(&disks_mutex);
5729 if (!error && mddev->kobj.sd) {
5730 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5731 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5737 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5740 md_alloc(dev, NULL);
5744 static int add_named_array(const char *val, const struct kernel_param *kp)
5747 * val must be "md_*" or "mdNNN".
5748 * For "md_*" we allocate an array with a large free minor number, and
5749 * set the name to val. val must not already be an active name.
5750 * For "mdNNN" we allocate an array with the minor number NNN
5751 * which must not already be in use.
5753 int len = strlen(val);
5754 char buf[DISK_NAME_LEN];
5755 unsigned long devnum;
5757 while (len && val[len-1] == '\n')
5759 if (len >= DISK_NAME_LEN)
5761 strlcpy(buf, val, len+1);
5762 if (strncmp(buf, "md_", 3) == 0)
5763 return md_alloc(0, buf);
5764 if (strncmp(buf, "md", 2) == 0 &&
5766 kstrtoul(buf+2, 10, &devnum) == 0 &&
5767 devnum <= MINORMASK)
5768 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5773 static void md_safemode_timeout(struct timer_list *t)
5775 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5777 mddev->safemode = 1;
5778 if (mddev->external)
5779 sysfs_notify_dirent_safe(mddev->sysfs_state);
5781 md_wakeup_thread(mddev->thread);
5784 static int start_dirty_degraded;
5786 int md_run(struct mddev *mddev)
5789 struct md_rdev *rdev;
5790 struct md_personality *pers;
5792 if (list_empty(&mddev->disks))
5793 /* cannot run an array with no devices.. */
5798 /* Cannot run until previous stop completes properly */
5799 if (mddev->sysfs_active)
5803 * Analyze all RAID superblock(s)
5805 if (!mddev->raid_disks) {
5806 if (!mddev->persistent)
5808 err = analyze_sbs(mddev);
5813 if (mddev->level != LEVEL_NONE)
5814 request_module("md-level-%d", mddev->level);
5815 else if (mddev->clevel[0])
5816 request_module("md-%s", mddev->clevel);
5819 * Drop all container device buffers, from now on
5820 * the only valid external interface is through the md
5823 mddev->has_superblocks = false;
5824 rdev_for_each(rdev, mddev) {
5825 if (test_bit(Faulty, &rdev->flags))
5827 sync_blockdev(rdev->bdev);
5828 invalidate_bdev(rdev->bdev);
5829 if (mddev->ro != 1 &&
5830 (bdev_read_only(rdev->bdev) ||
5831 bdev_read_only(rdev->meta_bdev))) {
5834 set_disk_ro(mddev->gendisk, 1);
5838 mddev->has_superblocks = true;
5840 /* perform some consistency tests on the device.
5841 * We don't want the data to overlap the metadata,
5842 * Internal Bitmap issues have been handled elsewhere.
5844 if (rdev->meta_bdev) {
5845 /* Nothing to check */;
5846 } else if (rdev->data_offset < rdev->sb_start) {
5847 if (mddev->dev_sectors &&
5848 rdev->data_offset + mddev->dev_sectors
5850 pr_warn("md: %s: data overlaps metadata\n",
5855 if (rdev->sb_start + rdev->sb_size/512
5856 > rdev->data_offset) {
5857 pr_warn("md: %s: metadata overlaps data\n",
5862 sysfs_notify_dirent_safe(rdev->sysfs_state);
5865 if (!bioset_initialized(&mddev->bio_set)) {
5866 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5870 if (!bioset_initialized(&mddev->sync_set)) {
5871 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5876 spin_lock(&pers_lock);
5877 pers = find_pers(mddev->level, mddev->clevel);
5878 if (!pers || !try_module_get(pers->owner)) {
5879 spin_unlock(&pers_lock);
5880 if (mddev->level != LEVEL_NONE)
5881 pr_warn("md: personality for level %d is not loaded!\n",
5884 pr_warn("md: personality for level %s is not loaded!\n",
5889 spin_unlock(&pers_lock);
5890 if (mddev->level != pers->level) {
5891 mddev->level = pers->level;
5892 mddev->new_level = pers->level;
5894 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5896 if (mddev->reshape_position != MaxSector &&
5897 pers->start_reshape == NULL) {
5898 /* This personality cannot handle reshaping... */
5899 module_put(pers->owner);
5904 if (pers->sync_request) {
5905 /* Warn if this is a potentially silly
5908 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5909 struct md_rdev *rdev2;
5912 rdev_for_each(rdev, mddev)
5913 rdev_for_each(rdev2, mddev) {
5915 rdev->bdev->bd_contains ==
5916 rdev2->bdev->bd_contains) {
5917 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5919 bdevname(rdev->bdev,b),
5920 bdevname(rdev2->bdev,b2));
5926 pr_warn("True protection against single-disk failure might be compromised.\n");
5929 mddev->recovery = 0;
5930 /* may be over-ridden by personality */
5931 mddev->resync_max_sectors = mddev->dev_sectors;
5933 mddev->ok_start_degraded = start_dirty_degraded;
5935 if (start_readonly && mddev->ro == 0)
5936 mddev->ro = 2; /* read-only, but switch on first write */
5938 err = pers->run(mddev);
5940 pr_warn("md: pers->run() failed ...\n");
5941 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5942 WARN_ONCE(!mddev->external_size,
5943 "%s: default size too small, but 'external_size' not in effect?\n",
5945 pr_warn("md: invalid array_size %llu > default size %llu\n",
5946 (unsigned long long)mddev->array_sectors / 2,
5947 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5950 if (err == 0 && pers->sync_request &&
5951 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5952 struct bitmap *bitmap;
5954 bitmap = md_bitmap_create(mddev, -1);
5955 if (IS_ERR(bitmap)) {
5956 err = PTR_ERR(bitmap);
5957 pr_warn("%s: failed to create bitmap (%d)\n",
5958 mdname(mddev), err);
5960 mddev->bitmap = bitmap;
5966 if (mddev->bitmap_info.max_write_behind > 0) {
5967 bool create_pool = false;
5969 rdev_for_each(rdev, mddev) {
5970 if (test_bit(WriteMostly, &rdev->flags) &&
5971 rdev_init_serial(rdev))
5974 if (create_pool && mddev->serial_info_pool == NULL) {
5975 mddev->serial_info_pool =
5976 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5977 sizeof(struct serial_info));
5978 if (!mddev->serial_info_pool) {
5988 rdev_for_each(rdev, mddev) {
5989 if (rdev->raid_disk >= 0 &&
5990 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5995 if (mddev->degraded)
5998 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6000 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6001 mddev->queue->backing_dev_info->congested_data = mddev;
6002 mddev->queue->backing_dev_info->congested_fn = md_congested;
6004 if (pers->sync_request) {
6005 if (mddev->kobj.sd &&
6006 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6007 pr_warn("md: cannot register extra attributes for %s\n",
6009 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6010 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6013 atomic_set(&mddev->max_corr_read_errors,
6014 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6015 mddev->safemode = 0;
6016 if (mddev_is_clustered(mddev))
6017 mddev->safemode_delay = 0;
6019 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
6022 spin_lock(&mddev->lock);
6024 spin_unlock(&mddev->lock);
6025 rdev_for_each(rdev, mddev)
6026 if (rdev->raid_disk >= 0)
6027 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6029 if (mddev->degraded && !mddev->ro)
6030 /* This ensures that recovering status is reported immediately
6031 * via sysfs - until a lack of spares is confirmed.
6033 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6034 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6036 if (mddev->sb_flags)
6037 md_update_sb(mddev, 0);
6039 md_new_event(mddev);
6043 mddev_detach(mddev);
6045 pers->free(mddev, mddev->private);
6046 mddev->private = NULL;
6047 module_put(pers->owner);
6048 md_bitmap_destroy(mddev);
6050 bioset_exit(&mddev->bio_set);
6051 bioset_exit(&mddev->sync_set);
6054 EXPORT_SYMBOL_GPL(md_run);
6056 static int do_md_run(struct mddev *mddev)
6060 set_bit(MD_NOT_READY, &mddev->flags);
6061 err = md_run(mddev);
6064 err = md_bitmap_load(mddev);
6066 md_bitmap_destroy(mddev);
6070 if (mddev_is_clustered(mddev))
6071 md_allow_write(mddev);
6073 /* run start up tasks that require md_thread */
6076 md_wakeup_thread(mddev->thread);
6077 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6079 set_capacity(mddev->gendisk, mddev->array_sectors);
6080 revalidate_disk(mddev->gendisk);
6081 clear_bit(MD_NOT_READY, &mddev->flags);
6083 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6084 sysfs_notify_dirent_safe(mddev->sysfs_state);
6085 sysfs_notify_dirent_safe(mddev->sysfs_action);
6086 sysfs_notify(&mddev->kobj, NULL, "degraded");
6088 clear_bit(MD_NOT_READY, &mddev->flags);
6092 int md_start(struct mddev *mddev)
6096 if (mddev->pers->start) {
6097 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6098 md_wakeup_thread(mddev->thread);
6099 ret = mddev->pers->start(mddev);
6100 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6101 md_wakeup_thread(mddev->sync_thread);
6105 EXPORT_SYMBOL_GPL(md_start);
6107 static int restart_array(struct mddev *mddev)
6109 struct gendisk *disk = mddev->gendisk;
6110 struct md_rdev *rdev;
6111 bool has_journal = false;
6112 bool has_readonly = false;
6114 /* Complain if it has no devices */
6115 if (list_empty(&mddev->disks))
6123 rdev_for_each_rcu(rdev, mddev) {
6124 if (test_bit(Journal, &rdev->flags) &&
6125 !test_bit(Faulty, &rdev->flags))
6127 if (bdev_read_only(rdev->bdev))
6128 has_readonly = true;
6131 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6132 /* Don't restart rw with journal missing/faulty */
6137 mddev->safemode = 0;
6139 set_disk_ro(disk, 0);
6140 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6141 /* Kick recovery or resync if necessary */
6142 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6143 md_wakeup_thread(mddev->thread);
6144 md_wakeup_thread(mddev->sync_thread);
6145 sysfs_notify_dirent_safe(mddev->sysfs_state);
6149 static void md_clean(struct mddev *mddev)
6151 mddev->array_sectors = 0;
6152 mddev->external_size = 0;
6153 mddev->dev_sectors = 0;
6154 mddev->raid_disks = 0;
6155 mddev->recovery_cp = 0;
6156 mddev->resync_min = 0;
6157 mddev->resync_max = MaxSector;
6158 mddev->reshape_position = MaxSector;
6159 mddev->external = 0;
6160 mddev->persistent = 0;
6161 mddev->level = LEVEL_NONE;
6162 mddev->clevel[0] = 0;
6164 mddev->sb_flags = 0;
6166 mddev->metadata_type[0] = 0;
6167 mddev->chunk_sectors = 0;
6168 mddev->ctime = mddev->utime = 0;
6170 mddev->max_disks = 0;
6172 mddev->can_decrease_events = 0;
6173 mddev->delta_disks = 0;
6174 mddev->reshape_backwards = 0;
6175 mddev->new_level = LEVEL_NONE;
6176 mddev->new_layout = 0;
6177 mddev->new_chunk_sectors = 0;
6178 mddev->curr_resync = 0;
6179 atomic64_set(&mddev->resync_mismatches, 0);
6180 mddev->suspend_lo = mddev->suspend_hi = 0;
6181 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6182 mddev->recovery = 0;
6185 mddev->degraded = 0;
6186 mddev->safemode = 0;
6187 mddev->private = NULL;
6188 mddev->cluster_info = NULL;
6189 mddev->bitmap_info.offset = 0;
6190 mddev->bitmap_info.default_offset = 0;
6191 mddev->bitmap_info.default_space = 0;
6192 mddev->bitmap_info.chunksize = 0;
6193 mddev->bitmap_info.daemon_sleep = 0;
6194 mddev->bitmap_info.max_write_behind = 0;
6195 mddev->bitmap_info.nodes = 0;
6198 static void __md_stop_writes(struct mddev *mddev)
6200 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6201 if (work_pending(&mddev->del_work))
6202 flush_workqueue(md_misc_wq);
6203 if (mddev->sync_thread) {
6204 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6205 md_reap_sync_thread(mddev);
6208 del_timer_sync(&mddev->safemode_timer);
6210 if (mddev->pers && mddev->pers->quiesce) {
6211 mddev->pers->quiesce(mddev, 1);
6212 mddev->pers->quiesce(mddev, 0);
6214 md_bitmap_flush(mddev);
6216 if (mddev->ro == 0 &&
6217 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6219 /* mark array as shutdown cleanly */
6220 if (!mddev_is_clustered(mddev))
6222 md_update_sb(mddev, 1);
6224 /* disable policy to guarantee rdevs free resources for serialization */
6225 mddev->serialize_policy = 0;
6226 mddev_destroy_serial_pool(mddev, NULL, true);
6229 void md_stop_writes(struct mddev *mddev)
6231 mddev_lock_nointr(mddev);
6232 __md_stop_writes(mddev);
6233 mddev_unlock(mddev);
6235 EXPORT_SYMBOL_GPL(md_stop_writes);
6237 static void mddev_detach(struct mddev *mddev)
6239 md_bitmap_wait_behind_writes(mddev);
6240 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6241 mddev->pers->quiesce(mddev, 1);
6242 mddev->pers->quiesce(mddev, 0);
6244 md_unregister_thread(&mddev->thread);
6246 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6249 static void __md_stop(struct mddev *mddev)
6251 struct md_personality *pers = mddev->pers;
6252 md_bitmap_destroy(mddev);
6253 mddev_detach(mddev);
6254 /* Ensure ->event_work is done */
6255 if (mddev->event_work.func)
6256 flush_workqueue(md_misc_wq);
6257 spin_lock(&mddev->lock);
6259 spin_unlock(&mddev->lock);
6260 pers->free(mddev, mddev->private);
6261 mddev->private = NULL;
6262 if (pers->sync_request && mddev->to_remove == NULL)
6263 mddev->to_remove = &md_redundancy_group;
6264 module_put(pers->owner);
6265 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6268 void md_stop(struct mddev *mddev)
6270 /* stop the array and free an attached data structures.
6271 * This is called from dm-raid
6274 bioset_exit(&mddev->bio_set);
6275 bioset_exit(&mddev->sync_set);
6278 EXPORT_SYMBOL_GPL(md_stop);
6280 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6285 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6287 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6288 md_wakeup_thread(mddev->thread);
6290 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6291 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6292 if (mddev->sync_thread)
6293 /* Thread might be blocked waiting for metadata update
6294 * which will now never happen */
6295 wake_up_process(mddev->sync_thread->tsk);
6297 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6299 mddev_unlock(mddev);
6300 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6302 wait_event(mddev->sb_wait,
6303 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6304 mddev_lock_nointr(mddev);
6306 mutex_lock(&mddev->open_mutex);
6307 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6308 mddev->sync_thread ||
6309 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6310 pr_warn("md: %s still in use.\n",mdname(mddev));
6312 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6313 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6314 md_wakeup_thread(mddev->thread);
6320 __md_stop_writes(mddev);
6326 set_disk_ro(mddev->gendisk, 1);
6327 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6328 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6329 md_wakeup_thread(mddev->thread);
6330 sysfs_notify_dirent_safe(mddev->sysfs_state);
6334 mutex_unlock(&mddev->open_mutex);
6339 * 0 - completely stop and dis-assemble array
6340 * 2 - stop but do not disassemble array
6342 static int do_md_stop(struct mddev *mddev, int mode,
6343 struct block_device *bdev)
6345 struct gendisk *disk = mddev->gendisk;
6346 struct md_rdev *rdev;
6349 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6351 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6352 md_wakeup_thread(mddev->thread);
6354 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6355 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6356 if (mddev->sync_thread)
6357 /* Thread might be blocked waiting for metadata update
6358 * which will now never happen */
6359 wake_up_process(mddev->sync_thread->tsk);
6361 mddev_unlock(mddev);
6362 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6363 !test_bit(MD_RECOVERY_RUNNING,
6364 &mddev->recovery)));
6365 mddev_lock_nointr(mddev);
6367 mutex_lock(&mddev->open_mutex);
6368 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6369 mddev->sysfs_active ||
6370 mddev->sync_thread ||
6371 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6372 pr_warn("md: %s still in use.\n",mdname(mddev));
6373 mutex_unlock(&mddev->open_mutex);
6375 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6376 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6377 md_wakeup_thread(mddev->thread);
6383 set_disk_ro(disk, 0);
6385 __md_stop_writes(mddev);
6387 mddev->queue->backing_dev_info->congested_fn = NULL;
6389 /* tell userspace to handle 'inactive' */
6390 sysfs_notify_dirent_safe(mddev->sysfs_state);
6392 rdev_for_each(rdev, mddev)
6393 if (rdev->raid_disk >= 0)
6394 sysfs_unlink_rdev(mddev, rdev);
6396 set_capacity(disk, 0);
6397 mutex_unlock(&mddev->open_mutex);
6399 revalidate_disk(disk);
6404 mutex_unlock(&mddev->open_mutex);
6406 * Free resources if final stop
6409 pr_info("md: %s stopped.\n", mdname(mddev));
6411 if (mddev->bitmap_info.file) {
6412 struct file *f = mddev->bitmap_info.file;
6413 spin_lock(&mddev->lock);
6414 mddev->bitmap_info.file = NULL;
6415 spin_unlock(&mddev->lock);
6418 mddev->bitmap_info.offset = 0;
6420 export_array(mddev);
6423 if (mddev->hold_active == UNTIL_STOP)
6424 mddev->hold_active = 0;
6426 md_new_event(mddev);
6427 sysfs_notify_dirent_safe(mddev->sysfs_state);
6432 static void autorun_array(struct mddev *mddev)
6434 struct md_rdev *rdev;
6437 if (list_empty(&mddev->disks))
6440 pr_info("md: running: ");
6442 rdev_for_each(rdev, mddev) {
6443 char b[BDEVNAME_SIZE];
6444 pr_cont("<%s>", bdevname(rdev->bdev,b));
6448 err = do_md_run(mddev);
6450 pr_warn("md: do_md_run() returned %d\n", err);
6451 do_md_stop(mddev, 0, NULL);
6456 * lets try to run arrays based on all disks that have arrived
6457 * until now. (those are in pending_raid_disks)
6459 * the method: pick the first pending disk, collect all disks with
6460 * the same UUID, remove all from the pending list and put them into
6461 * the 'same_array' list. Then order this list based on superblock
6462 * update time (freshest comes first), kick out 'old' disks and
6463 * compare superblocks. If everything's fine then run it.
6465 * If "unit" is allocated, then bump its reference count
6467 static void autorun_devices(int part)
6469 struct md_rdev *rdev0, *rdev, *tmp;
6470 struct mddev *mddev;
6471 char b[BDEVNAME_SIZE];
6473 pr_info("md: autorun ...\n");
6474 while (!list_empty(&pending_raid_disks)) {
6477 LIST_HEAD(candidates);
6478 rdev0 = list_entry(pending_raid_disks.next,
6479 struct md_rdev, same_set);
6481 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6482 INIT_LIST_HEAD(&candidates);
6483 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6484 if (super_90_load(rdev, rdev0, 0) >= 0) {
6485 pr_debug("md: adding %s ...\n",
6486 bdevname(rdev->bdev,b));
6487 list_move(&rdev->same_set, &candidates);
6490 * now we have a set of devices, with all of them having
6491 * mostly sane superblocks. It's time to allocate the
6495 dev = MKDEV(mdp_major,
6496 rdev0->preferred_minor << MdpMinorShift);
6497 unit = MINOR(dev) >> MdpMinorShift;
6499 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6502 if (rdev0->preferred_minor != unit) {
6503 pr_warn("md: unit number in %s is bad: %d\n",
6504 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6508 md_probe(dev, NULL, NULL);
6509 mddev = mddev_find(dev);
6510 if (!mddev || !mddev->gendisk) {
6515 if (mddev_lock(mddev))
6516 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6517 else if (mddev->raid_disks || mddev->major_version
6518 || !list_empty(&mddev->disks)) {
6519 pr_warn("md: %s already running, cannot run %s\n",
6520 mdname(mddev), bdevname(rdev0->bdev,b));
6521 mddev_unlock(mddev);
6523 pr_debug("md: created %s\n", mdname(mddev));
6524 mddev->persistent = 1;
6525 rdev_for_each_list(rdev, tmp, &candidates) {
6526 list_del_init(&rdev->same_set);
6527 if (bind_rdev_to_array(rdev, mddev))
6530 autorun_array(mddev);
6531 mddev_unlock(mddev);
6533 /* on success, candidates will be empty, on error
6536 rdev_for_each_list(rdev, tmp, &candidates) {
6537 list_del_init(&rdev->same_set);
6542 pr_info("md: ... autorun DONE.\n");
6544 #endif /* !MODULE */
6546 static int get_version(void __user *arg)
6550 ver.major = MD_MAJOR_VERSION;
6551 ver.minor = MD_MINOR_VERSION;
6552 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6554 if (copy_to_user(arg, &ver, sizeof(ver)))
6560 static int get_array_info(struct mddev *mddev, void __user *arg)
6562 mdu_array_info_t info;
6563 int nr,working,insync,failed,spare;
6564 struct md_rdev *rdev;
6566 nr = working = insync = failed = spare = 0;
6568 rdev_for_each_rcu(rdev, mddev) {
6570 if (test_bit(Faulty, &rdev->flags))
6574 if (test_bit(In_sync, &rdev->flags))
6576 else if (test_bit(Journal, &rdev->flags))
6577 /* TODO: add journal count to md_u.h */
6585 info.major_version = mddev->major_version;
6586 info.minor_version = mddev->minor_version;
6587 info.patch_version = MD_PATCHLEVEL_VERSION;
6588 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6589 info.level = mddev->level;
6590 info.size = mddev->dev_sectors / 2;
6591 if (info.size != mddev->dev_sectors / 2) /* overflow */
6594 info.raid_disks = mddev->raid_disks;
6595 info.md_minor = mddev->md_minor;
6596 info.not_persistent= !mddev->persistent;
6598 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6601 info.state = (1<<MD_SB_CLEAN);
6602 if (mddev->bitmap && mddev->bitmap_info.offset)
6603 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6604 if (mddev_is_clustered(mddev))
6605 info.state |= (1<<MD_SB_CLUSTERED);
6606 info.active_disks = insync;
6607 info.working_disks = working;
6608 info.failed_disks = failed;
6609 info.spare_disks = spare;
6611 info.layout = mddev->layout;
6612 info.chunk_size = mddev->chunk_sectors << 9;
6614 if (copy_to_user(arg, &info, sizeof(info)))
6620 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6622 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6626 file = kzalloc(sizeof(*file), GFP_NOIO);
6631 spin_lock(&mddev->lock);
6632 /* bitmap enabled */
6633 if (mddev->bitmap_info.file) {
6634 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6635 sizeof(file->pathname));
6639 memmove(file->pathname, ptr,
6640 sizeof(file->pathname)-(ptr-file->pathname));
6642 spin_unlock(&mddev->lock);
6645 copy_to_user(arg, file, sizeof(*file)))
6652 static int get_disk_info(struct mddev *mddev, void __user * arg)
6654 mdu_disk_info_t info;
6655 struct md_rdev *rdev;
6657 if (copy_from_user(&info, arg, sizeof(info)))
6661 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6663 info.major = MAJOR(rdev->bdev->bd_dev);
6664 info.minor = MINOR(rdev->bdev->bd_dev);
6665 info.raid_disk = rdev->raid_disk;
6667 if (test_bit(Faulty, &rdev->flags))
6668 info.state |= (1<<MD_DISK_FAULTY);
6669 else if (test_bit(In_sync, &rdev->flags)) {
6670 info.state |= (1<<MD_DISK_ACTIVE);
6671 info.state |= (1<<MD_DISK_SYNC);
6673 if (test_bit(Journal, &rdev->flags))
6674 info.state |= (1<<MD_DISK_JOURNAL);
6675 if (test_bit(WriteMostly, &rdev->flags))
6676 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6677 if (test_bit(FailFast, &rdev->flags))
6678 info.state |= (1<<MD_DISK_FAILFAST);
6680 info.major = info.minor = 0;
6681 info.raid_disk = -1;
6682 info.state = (1<<MD_DISK_REMOVED);
6686 if (copy_to_user(arg, &info, sizeof(info)))
6692 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6694 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6695 struct md_rdev *rdev;
6696 dev_t dev = MKDEV(info->major,info->minor);
6698 if (mddev_is_clustered(mddev) &&
6699 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6700 pr_warn("%s: Cannot add to clustered mddev.\n",
6705 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6708 if (!mddev->raid_disks) {
6710 /* expecting a device which has a superblock */
6711 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6713 pr_warn("md: md_import_device returned %ld\n",
6715 return PTR_ERR(rdev);
6717 if (!list_empty(&mddev->disks)) {
6718 struct md_rdev *rdev0
6719 = list_entry(mddev->disks.next,
6720 struct md_rdev, same_set);
6721 err = super_types[mddev->major_version]
6722 .load_super(rdev, rdev0, mddev->minor_version);
6724 pr_warn("md: %s has different UUID to %s\n",
6725 bdevname(rdev->bdev,b),
6726 bdevname(rdev0->bdev,b2));
6731 err = bind_rdev_to_array(rdev, mddev);
6738 * add_new_disk can be used once the array is assembled
6739 * to add "hot spares". They must already have a superblock
6744 if (!mddev->pers->hot_add_disk) {
6745 pr_warn("%s: personality does not support diskops!\n",
6749 if (mddev->persistent)
6750 rdev = md_import_device(dev, mddev->major_version,
6751 mddev->minor_version);
6753 rdev = md_import_device(dev, -1, -1);
6755 pr_warn("md: md_import_device returned %ld\n",
6757 return PTR_ERR(rdev);
6759 /* set saved_raid_disk if appropriate */
6760 if (!mddev->persistent) {
6761 if (info->state & (1<<MD_DISK_SYNC) &&
6762 info->raid_disk < mddev->raid_disks) {
6763 rdev->raid_disk = info->raid_disk;
6764 set_bit(In_sync, &rdev->flags);
6765 clear_bit(Bitmap_sync, &rdev->flags);
6767 rdev->raid_disk = -1;
6768 rdev->saved_raid_disk = rdev->raid_disk;
6770 super_types[mddev->major_version].
6771 validate_super(mddev, rdev);
6772 if ((info->state & (1<<MD_DISK_SYNC)) &&
6773 rdev->raid_disk != info->raid_disk) {
6774 /* This was a hot-add request, but events doesn't
6775 * match, so reject it.
6781 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6782 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6783 set_bit(WriteMostly, &rdev->flags);
6785 clear_bit(WriteMostly, &rdev->flags);
6786 if (info->state & (1<<MD_DISK_FAILFAST))
6787 set_bit(FailFast, &rdev->flags);
6789 clear_bit(FailFast, &rdev->flags);
6791 if (info->state & (1<<MD_DISK_JOURNAL)) {
6792 struct md_rdev *rdev2;
6793 bool has_journal = false;
6795 /* make sure no existing journal disk */
6796 rdev_for_each(rdev2, mddev) {
6797 if (test_bit(Journal, &rdev2->flags)) {
6802 if (has_journal || mddev->bitmap) {
6806 set_bit(Journal, &rdev->flags);
6809 * check whether the device shows up in other nodes
6811 if (mddev_is_clustered(mddev)) {
6812 if (info->state & (1 << MD_DISK_CANDIDATE))
6813 set_bit(Candidate, &rdev->flags);
6814 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6815 /* --add initiated by this node */
6816 err = md_cluster_ops->add_new_disk(mddev, rdev);
6824 rdev->raid_disk = -1;
6825 err = bind_rdev_to_array(rdev, mddev);
6830 if (mddev_is_clustered(mddev)) {
6831 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6833 err = md_cluster_ops->new_disk_ack(mddev,
6836 md_kick_rdev_from_array(rdev);
6840 md_cluster_ops->add_new_disk_cancel(mddev);
6842 err = add_bound_rdev(rdev);
6846 err = add_bound_rdev(rdev);
6851 /* otherwise, add_new_disk is only allowed
6852 * for major_version==0 superblocks
6854 if (mddev->major_version != 0) {
6855 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6859 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6861 rdev = md_import_device(dev, -1, 0);
6863 pr_warn("md: error, md_import_device() returned %ld\n",
6865 return PTR_ERR(rdev);
6867 rdev->desc_nr = info->number;
6868 if (info->raid_disk < mddev->raid_disks)
6869 rdev->raid_disk = info->raid_disk;
6871 rdev->raid_disk = -1;
6873 if (rdev->raid_disk < mddev->raid_disks)
6874 if (info->state & (1<<MD_DISK_SYNC))
6875 set_bit(In_sync, &rdev->flags);
6877 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6878 set_bit(WriteMostly, &rdev->flags);
6879 if (info->state & (1<<MD_DISK_FAILFAST))
6880 set_bit(FailFast, &rdev->flags);
6882 if (!mddev->persistent) {
6883 pr_debug("md: nonpersistent superblock ...\n");
6884 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6886 rdev->sb_start = calc_dev_sboffset(rdev);
6887 rdev->sectors = rdev->sb_start;
6889 err = bind_rdev_to_array(rdev, mddev);
6899 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6901 char b[BDEVNAME_SIZE];
6902 struct md_rdev *rdev;
6907 rdev = find_rdev(mddev, dev);
6911 if (rdev->raid_disk < 0)
6914 clear_bit(Blocked, &rdev->flags);
6915 remove_and_add_spares(mddev, rdev);
6917 if (rdev->raid_disk >= 0)
6921 if (mddev_is_clustered(mddev))
6922 md_cluster_ops->remove_disk(mddev, rdev);
6924 md_kick_rdev_from_array(rdev);
6925 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6927 md_wakeup_thread(mddev->thread);
6929 md_update_sb(mddev, 1);
6930 md_new_event(mddev);
6934 pr_debug("md: cannot remove active disk %s from %s ...\n",
6935 bdevname(rdev->bdev,b), mdname(mddev));
6939 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6941 char b[BDEVNAME_SIZE];
6943 struct md_rdev *rdev;
6948 if (mddev->major_version != 0) {
6949 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6953 if (!mddev->pers->hot_add_disk) {
6954 pr_warn("%s: personality does not support diskops!\n",
6959 rdev = md_import_device(dev, -1, 0);
6961 pr_warn("md: error, md_import_device() returned %ld\n",
6966 if (mddev->persistent)
6967 rdev->sb_start = calc_dev_sboffset(rdev);
6969 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6971 rdev->sectors = rdev->sb_start;
6973 if (test_bit(Faulty, &rdev->flags)) {
6974 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6975 bdevname(rdev->bdev,b), mdname(mddev));
6980 clear_bit(In_sync, &rdev->flags);
6982 rdev->saved_raid_disk = -1;
6983 err = bind_rdev_to_array(rdev, mddev);
6988 * The rest should better be atomic, we can have disk failures
6989 * noticed in interrupt contexts ...
6992 rdev->raid_disk = -1;
6994 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6996 md_update_sb(mddev, 1);
6998 * Kick recovery, maybe this spare has to be added to the
6999 * array immediately.
7001 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7002 md_wakeup_thread(mddev->thread);
7003 md_new_event(mddev);
7011 static int set_bitmap_file(struct mddev *mddev, int fd)
7016 if (!mddev->pers->quiesce || !mddev->thread)
7018 if (mddev->recovery || mddev->sync_thread)
7020 /* we should be able to change the bitmap.. */
7024 struct inode *inode;
7027 if (mddev->bitmap || mddev->bitmap_info.file)
7028 return -EEXIST; /* cannot add when bitmap is present */
7032 pr_warn("%s: error: failed to get bitmap file\n",
7037 inode = f->f_mapping->host;
7038 if (!S_ISREG(inode->i_mode)) {
7039 pr_warn("%s: error: bitmap file must be a regular file\n",
7042 } else if (!(f->f_mode & FMODE_WRITE)) {
7043 pr_warn("%s: error: bitmap file must open for write\n",
7046 } else if (atomic_read(&inode->i_writecount) != 1) {
7047 pr_warn("%s: error: bitmap file is already in use\n",
7055 mddev->bitmap_info.file = f;
7056 mddev->bitmap_info.offset = 0; /* file overrides offset */
7057 } else if (mddev->bitmap == NULL)
7058 return -ENOENT; /* cannot remove what isn't there */
7062 struct bitmap *bitmap;
7064 bitmap = md_bitmap_create(mddev, -1);
7065 mddev_suspend(mddev);
7066 if (!IS_ERR(bitmap)) {
7067 mddev->bitmap = bitmap;
7068 err = md_bitmap_load(mddev);
7070 err = PTR_ERR(bitmap);
7072 md_bitmap_destroy(mddev);
7075 mddev_resume(mddev);
7076 } else if (fd < 0) {
7077 mddev_suspend(mddev);
7078 md_bitmap_destroy(mddev);
7079 mddev_resume(mddev);
7083 struct file *f = mddev->bitmap_info.file;
7085 spin_lock(&mddev->lock);
7086 mddev->bitmap_info.file = NULL;
7087 spin_unlock(&mddev->lock);
7096 * set_array_info is used two different ways
7097 * The original usage is when creating a new array.
7098 * In this usage, raid_disks is > 0 and it together with
7099 * level, size, not_persistent,layout,chunksize determine the
7100 * shape of the array.
7101 * This will always create an array with a type-0.90.0 superblock.
7102 * The newer usage is when assembling an array.
7103 * In this case raid_disks will be 0, and the major_version field is
7104 * use to determine which style super-blocks are to be found on the devices.
7105 * The minor and patch _version numbers are also kept incase the
7106 * super_block handler wishes to interpret them.
7108 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
7111 if (info->raid_disks == 0) {
7112 /* just setting version number for superblock loading */
7113 if (info->major_version < 0 ||
7114 info->major_version >= ARRAY_SIZE(super_types) ||
7115 super_types[info->major_version].name == NULL) {
7116 /* maybe try to auto-load a module? */
7117 pr_warn("md: superblock version %d not known\n",
7118 info->major_version);
7121 mddev->major_version = info->major_version;
7122 mddev->minor_version = info->minor_version;
7123 mddev->patch_version = info->patch_version;
7124 mddev->persistent = !info->not_persistent;
7125 /* ensure mddev_put doesn't delete this now that there
7126 * is some minimal configuration.
7128 mddev->ctime = ktime_get_real_seconds();
7131 mddev->major_version = MD_MAJOR_VERSION;
7132 mddev->minor_version = MD_MINOR_VERSION;
7133 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7134 mddev->ctime = ktime_get_real_seconds();
7136 mddev->level = info->level;
7137 mddev->clevel[0] = 0;
7138 mddev->dev_sectors = 2 * (sector_t)info->size;
7139 mddev->raid_disks = info->raid_disks;
7140 /* don't set md_minor, it is determined by which /dev/md* was
7143 if (info->state & (1<<MD_SB_CLEAN))
7144 mddev->recovery_cp = MaxSector;
7146 mddev->recovery_cp = 0;
7147 mddev->persistent = ! info->not_persistent;
7148 mddev->external = 0;
7150 mddev->layout = info->layout;
7151 if (mddev->level == 0)
7152 /* Cannot trust RAID0 layout info here */
7154 mddev->chunk_sectors = info->chunk_size >> 9;
7156 if (mddev->persistent) {
7157 mddev->max_disks = MD_SB_DISKS;
7159 mddev->sb_flags = 0;
7161 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7163 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7164 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7165 mddev->bitmap_info.offset = 0;
7167 mddev->reshape_position = MaxSector;
7170 * Generate a 128 bit UUID
7172 get_random_bytes(mddev->uuid, 16);
7174 mddev->new_level = mddev->level;
7175 mddev->new_chunk_sectors = mddev->chunk_sectors;
7176 mddev->new_layout = mddev->layout;
7177 mddev->delta_disks = 0;
7178 mddev->reshape_backwards = 0;
7183 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7185 lockdep_assert_held(&mddev->reconfig_mutex);
7187 if (mddev->external_size)
7190 mddev->array_sectors = array_sectors;
7192 EXPORT_SYMBOL(md_set_array_sectors);
7194 static int update_size(struct mddev *mddev, sector_t num_sectors)
7196 struct md_rdev *rdev;
7198 int fit = (num_sectors == 0);
7199 sector_t old_dev_sectors = mddev->dev_sectors;
7201 if (mddev->pers->resize == NULL)
7203 /* The "num_sectors" is the number of sectors of each device that
7204 * is used. This can only make sense for arrays with redundancy.
7205 * linear and raid0 always use whatever space is available. We can only
7206 * consider changing this number if no resync or reconstruction is
7207 * happening, and if the new size is acceptable. It must fit before the
7208 * sb_start or, if that is <data_offset, it must fit before the size
7209 * of each device. If num_sectors is zero, we find the largest size
7212 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7218 rdev_for_each(rdev, mddev) {
7219 sector_t avail = rdev->sectors;
7221 if (fit && (num_sectors == 0 || num_sectors > avail))
7222 num_sectors = avail;
7223 if (avail < num_sectors)
7226 rv = mddev->pers->resize(mddev, num_sectors);
7228 if (mddev_is_clustered(mddev))
7229 md_cluster_ops->update_size(mddev, old_dev_sectors);
7230 else if (mddev->queue) {
7231 set_capacity(mddev->gendisk, mddev->array_sectors);
7232 revalidate_disk(mddev->gendisk);
7238 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7241 struct md_rdev *rdev;
7242 /* change the number of raid disks */
7243 if (mddev->pers->check_reshape == NULL)
7247 if (raid_disks <= 0 ||
7248 (mddev->max_disks && raid_disks >= mddev->max_disks))
7250 if (mddev->sync_thread ||
7251 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7252 mddev->reshape_position != MaxSector)
7255 rdev_for_each(rdev, mddev) {
7256 if (mddev->raid_disks < raid_disks &&
7257 rdev->data_offset < rdev->new_data_offset)
7259 if (mddev->raid_disks > raid_disks &&
7260 rdev->data_offset > rdev->new_data_offset)
7264 mddev->delta_disks = raid_disks - mddev->raid_disks;
7265 if (mddev->delta_disks < 0)
7266 mddev->reshape_backwards = 1;
7267 else if (mddev->delta_disks > 0)
7268 mddev->reshape_backwards = 0;
7270 rv = mddev->pers->check_reshape(mddev);
7272 mddev->delta_disks = 0;
7273 mddev->reshape_backwards = 0;
7279 * update_array_info is used to change the configuration of an
7281 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7282 * fields in the info are checked against the array.
7283 * Any differences that cannot be handled will cause an error.
7284 * Normally, only one change can be managed at a time.
7286 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7292 /* calculate expected state,ignoring low bits */
7293 if (mddev->bitmap && mddev->bitmap_info.offset)
7294 state |= (1 << MD_SB_BITMAP_PRESENT);
7296 if (mddev->major_version != info->major_version ||
7297 mddev->minor_version != info->minor_version ||
7298 /* mddev->patch_version != info->patch_version || */
7299 mddev->ctime != info->ctime ||
7300 mddev->level != info->level ||
7301 /* mddev->layout != info->layout || */
7302 mddev->persistent != !info->not_persistent ||
7303 mddev->chunk_sectors != info->chunk_size >> 9 ||
7304 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7305 ((state^info->state) & 0xfffffe00)
7308 /* Check there is only one change */
7309 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7311 if (mddev->raid_disks != info->raid_disks)
7313 if (mddev->layout != info->layout)
7315 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7322 if (mddev->layout != info->layout) {
7324 * we don't need to do anything at the md level, the
7325 * personality will take care of it all.
7327 if (mddev->pers->check_reshape == NULL)
7330 mddev->new_layout = info->layout;
7331 rv = mddev->pers->check_reshape(mddev);
7333 mddev->new_layout = mddev->layout;
7337 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7338 rv = update_size(mddev, (sector_t)info->size * 2);
7340 if (mddev->raid_disks != info->raid_disks)
7341 rv = update_raid_disks(mddev, info->raid_disks);
7343 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7344 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7348 if (mddev->recovery || mddev->sync_thread) {
7352 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7353 struct bitmap *bitmap;
7354 /* add the bitmap */
7355 if (mddev->bitmap) {
7359 if (mddev->bitmap_info.default_offset == 0) {
7363 mddev->bitmap_info.offset =
7364 mddev->bitmap_info.default_offset;
7365 mddev->bitmap_info.space =
7366 mddev->bitmap_info.default_space;
7367 bitmap = md_bitmap_create(mddev, -1);
7368 mddev_suspend(mddev);
7369 if (!IS_ERR(bitmap)) {
7370 mddev->bitmap = bitmap;
7371 rv = md_bitmap_load(mddev);
7373 rv = PTR_ERR(bitmap);
7375 md_bitmap_destroy(mddev);
7376 mddev_resume(mddev);
7378 /* remove the bitmap */
7379 if (!mddev->bitmap) {
7383 if (mddev->bitmap->storage.file) {
7387 if (mddev->bitmap_info.nodes) {
7388 /* hold PW on all the bitmap lock */
7389 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7390 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7392 md_cluster_ops->unlock_all_bitmaps(mddev);
7396 mddev->bitmap_info.nodes = 0;
7397 md_cluster_ops->leave(mddev);
7399 mddev_suspend(mddev);
7400 md_bitmap_destroy(mddev);
7401 mddev_resume(mddev);
7402 mddev->bitmap_info.offset = 0;
7405 md_update_sb(mddev, 1);
7411 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7413 struct md_rdev *rdev;
7416 if (mddev->pers == NULL)
7420 rdev = md_find_rdev_rcu(mddev, dev);
7424 md_error(mddev, rdev);
7425 if (!test_bit(Faulty, &rdev->flags))
7433 * We have a problem here : there is no easy way to give a CHS
7434 * virtual geometry. We currently pretend that we have a 2 heads
7435 * 4 sectors (with a BIG number of cylinders...). This drives
7436 * dosfs just mad... ;-)
7438 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7440 struct mddev *mddev = bdev->bd_disk->private_data;
7444 geo->cylinders = mddev->array_sectors / 8;
7448 static inline bool md_ioctl_valid(unsigned int cmd)
7453 case GET_ARRAY_INFO:
7454 case GET_BITMAP_FILE:
7457 case HOT_REMOVE_DISK:
7460 case RESTART_ARRAY_RW:
7462 case SET_ARRAY_INFO:
7463 case SET_BITMAP_FILE:
7464 case SET_DISK_FAULTY:
7467 case CLUSTERED_DISK_NACK:
7474 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7475 unsigned int cmd, unsigned long arg)
7478 void __user *argp = (void __user *)arg;
7479 struct mddev *mddev = NULL;
7481 bool did_set_md_closing = false;
7483 if (!md_ioctl_valid(cmd))
7488 case GET_ARRAY_INFO:
7492 if (!capable(CAP_SYS_ADMIN))
7497 * Commands dealing with the RAID driver but not any
7502 err = get_version(argp);
7508 autostart_arrays(arg);
7515 * Commands creating/starting a new array:
7518 mddev = bdev->bd_disk->private_data;
7525 /* Some actions do not requires the mutex */
7527 case GET_ARRAY_INFO:
7528 if (!mddev->raid_disks && !mddev->external)
7531 err = get_array_info(mddev, argp);
7535 if (!mddev->raid_disks && !mddev->external)
7538 err = get_disk_info(mddev, argp);
7541 case SET_DISK_FAULTY:
7542 err = set_disk_faulty(mddev, new_decode_dev(arg));
7545 case GET_BITMAP_FILE:
7546 err = get_bitmap_file(mddev, argp);
7551 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7552 flush_rdev_wq(mddev);
7554 if (cmd == HOT_REMOVE_DISK)
7555 /* need to ensure recovery thread has run */
7556 wait_event_interruptible_timeout(mddev->sb_wait,
7557 !test_bit(MD_RECOVERY_NEEDED,
7559 msecs_to_jiffies(5000));
7560 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7561 /* Need to flush page cache, and ensure no-one else opens
7564 mutex_lock(&mddev->open_mutex);
7565 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7566 mutex_unlock(&mddev->open_mutex);
7570 WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
7571 set_bit(MD_CLOSING, &mddev->flags);
7572 did_set_md_closing = true;
7573 mutex_unlock(&mddev->open_mutex);
7574 sync_blockdev(bdev);
7576 err = mddev_lock(mddev);
7578 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7583 if (cmd == SET_ARRAY_INFO) {
7584 mdu_array_info_t info;
7586 memset(&info, 0, sizeof(info));
7587 else if (copy_from_user(&info, argp, sizeof(info))) {
7592 err = update_array_info(mddev, &info);
7594 pr_warn("md: couldn't update array info. %d\n", err);
7599 if (!list_empty(&mddev->disks)) {
7600 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7604 if (mddev->raid_disks) {
7605 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7609 err = set_array_info(mddev, &info);
7611 pr_warn("md: couldn't set array info. %d\n", err);
7618 * Commands querying/configuring an existing array:
7620 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7621 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7622 if ((!mddev->raid_disks && !mddev->external)
7623 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7624 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7625 && cmd != GET_BITMAP_FILE) {
7631 * Commands even a read-only array can execute:
7634 case RESTART_ARRAY_RW:
7635 err = restart_array(mddev);
7639 err = do_md_stop(mddev, 0, bdev);
7643 err = md_set_readonly(mddev, bdev);
7646 case HOT_REMOVE_DISK:
7647 err = hot_remove_disk(mddev, new_decode_dev(arg));
7651 /* We can support ADD_NEW_DISK on read-only arrays
7652 * only if we are re-adding a preexisting device.
7653 * So require mddev->pers and MD_DISK_SYNC.
7656 mdu_disk_info_t info;
7657 if (copy_from_user(&info, argp, sizeof(info)))
7659 else if (!(info.state & (1<<MD_DISK_SYNC)))
7660 /* Need to clear read-only for this */
7663 err = add_new_disk(mddev, &info);
7669 if (get_user(ro, (int __user *)(arg))) {
7675 /* if the bdev is going readonly the value of mddev->ro
7676 * does not matter, no writes are coming
7681 /* are we are already prepared for writes? */
7685 /* transitioning to readauto need only happen for
7686 * arrays that call md_write_start
7689 err = restart_array(mddev);
7692 set_disk_ro(mddev->gendisk, 0);
7699 * The remaining ioctls are changing the state of the
7700 * superblock, so we do not allow them on read-only arrays.
7702 if (mddev->ro && mddev->pers) {
7703 if (mddev->ro == 2) {
7705 sysfs_notify_dirent_safe(mddev->sysfs_state);
7706 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7707 /* mddev_unlock will wake thread */
7708 /* If a device failed while we were read-only, we
7709 * need to make sure the metadata is updated now.
7711 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7712 mddev_unlock(mddev);
7713 wait_event(mddev->sb_wait,
7714 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7715 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7716 mddev_lock_nointr(mddev);
7727 mdu_disk_info_t info;
7728 if (copy_from_user(&info, argp, sizeof(info)))
7731 err = add_new_disk(mddev, &info);
7735 case CLUSTERED_DISK_NACK:
7736 if (mddev_is_clustered(mddev))
7737 md_cluster_ops->new_disk_ack(mddev, false);
7743 err = hot_add_disk(mddev, new_decode_dev(arg));
7747 err = do_md_run(mddev);
7750 case SET_BITMAP_FILE:
7751 err = set_bitmap_file(mddev, (int)arg);
7760 if (mddev->hold_active == UNTIL_IOCTL &&
7762 mddev->hold_active = 0;
7763 mddev_unlock(mddev);
7765 if(did_set_md_closing)
7766 clear_bit(MD_CLOSING, &mddev->flags);
7769 #ifdef CONFIG_COMPAT
7770 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7771 unsigned int cmd, unsigned long arg)
7774 case HOT_REMOVE_DISK:
7776 case SET_DISK_FAULTY:
7777 case SET_BITMAP_FILE:
7778 /* These take in integer arg, do not convert */
7781 arg = (unsigned long)compat_ptr(arg);
7785 return md_ioctl(bdev, mode, cmd, arg);
7787 #endif /* CONFIG_COMPAT */
7789 static int md_open(struct block_device *bdev, fmode_t mode)
7792 * Succeed if we can lock the mddev, which confirms that
7793 * it isn't being stopped right now.
7795 struct mddev *mddev = mddev_find(bdev->bd_dev);
7801 if (mddev->gendisk != bdev->bd_disk) {
7802 /* we are racing with mddev_put which is discarding this
7806 /* Wait until bdev->bd_disk is definitely gone */
7807 if (work_pending(&mddev->del_work))
7808 flush_workqueue(md_misc_wq);
7809 /* Then retry the open from the top */
7810 return -ERESTARTSYS;
7812 BUG_ON(mddev != bdev->bd_disk->private_data);
7814 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7817 if (test_bit(MD_CLOSING, &mddev->flags)) {
7818 mutex_unlock(&mddev->open_mutex);
7824 atomic_inc(&mddev->openers);
7825 mutex_unlock(&mddev->open_mutex);
7827 check_disk_change(bdev);
7834 static void md_release(struct gendisk *disk, fmode_t mode)
7836 struct mddev *mddev = disk->private_data;
7839 atomic_dec(&mddev->openers);
7843 static int md_media_changed(struct gendisk *disk)
7845 struct mddev *mddev = disk->private_data;
7847 return mddev->changed;
7850 static int md_revalidate(struct gendisk *disk)
7852 struct mddev *mddev = disk->private_data;
7857 static const struct block_device_operations md_fops =
7859 .owner = THIS_MODULE,
7860 .submit_bio = md_submit_bio,
7862 .release = md_release,
7864 #ifdef CONFIG_COMPAT
7865 .compat_ioctl = md_compat_ioctl,
7867 .getgeo = md_getgeo,
7868 .media_changed = md_media_changed,
7869 .revalidate_disk= md_revalidate,
7872 static int md_thread(void *arg)
7874 struct md_thread *thread = arg;
7877 * md_thread is a 'system-thread', it's priority should be very
7878 * high. We avoid resource deadlocks individually in each
7879 * raid personality. (RAID5 does preallocation) We also use RR and
7880 * the very same RT priority as kswapd, thus we will never get
7881 * into a priority inversion deadlock.
7883 * we definitely have to have equal or higher priority than
7884 * bdflush, otherwise bdflush will deadlock if there are too
7885 * many dirty RAID5 blocks.
7888 allow_signal(SIGKILL);
7889 while (!kthread_should_stop()) {
7891 /* We need to wait INTERRUPTIBLE so that
7892 * we don't add to the load-average.
7893 * That means we need to be sure no signals are
7896 if (signal_pending(current))
7897 flush_signals(current);
7899 wait_event_interruptible_timeout
7901 test_bit(THREAD_WAKEUP, &thread->flags)
7902 || kthread_should_stop() || kthread_should_park(),
7905 clear_bit(THREAD_WAKEUP, &thread->flags);
7906 if (kthread_should_park())
7908 if (!kthread_should_stop())
7909 thread->run(thread);
7915 void md_wakeup_thread(struct md_thread *thread)
7918 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7919 set_bit(THREAD_WAKEUP, &thread->flags);
7920 wake_up(&thread->wqueue);
7923 EXPORT_SYMBOL(md_wakeup_thread);
7925 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7926 struct mddev *mddev, const char *name)
7928 struct md_thread *thread;
7930 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7934 init_waitqueue_head(&thread->wqueue);
7937 thread->mddev = mddev;
7938 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7939 thread->tsk = kthread_run(md_thread, thread,
7941 mdname(thread->mddev),
7943 if (IS_ERR(thread->tsk)) {
7949 EXPORT_SYMBOL(md_register_thread);
7951 void md_unregister_thread(struct md_thread **threadp)
7953 struct md_thread *thread = *threadp;
7956 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7957 /* Locking ensures that mddev_unlock does not wake_up a
7958 * non-existent thread
7960 spin_lock(&pers_lock);
7962 spin_unlock(&pers_lock);
7964 kthread_stop(thread->tsk);
7967 EXPORT_SYMBOL(md_unregister_thread);
7969 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7971 if (!rdev || test_bit(Faulty, &rdev->flags))
7974 if (!mddev->pers || !mddev->pers->error_handler)
7976 mddev->pers->error_handler(mddev,rdev);
7977 if (mddev->degraded)
7978 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7979 sysfs_notify_dirent_safe(rdev->sysfs_state);
7980 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7981 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7982 md_wakeup_thread(mddev->thread);
7983 if (mddev->event_work.func)
7984 queue_work(md_misc_wq, &mddev->event_work);
7985 md_new_event(mddev);
7987 EXPORT_SYMBOL(md_error);
7989 /* seq_file implementation /proc/mdstat */
7991 static void status_unused(struct seq_file *seq)
7994 struct md_rdev *rdev;
7996 seq_printf(seq, "unused devices: ");
7998 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7999 char b[BDEVNAME_SIZE];
8001 seq_printf(seq, "%s ",
8002 bdevname(rdev->bdev,b));
8005 seq_printf(seq, "<none>");
8007 seq_printf(seq, "\n");
8010 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8012 sector_t max_sectors, resync, res;
8013 unsigned long dt, db = 0;
8014 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8015 int scale, recovery_active;
8016 unsigned int per_milli;
8018 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8019 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8020 max_sectors = mddev->resync_max_sectors;
8022 max_sectors = mddev->dev_sectors;
8024 resync = mddev->curr_resync;
8026 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8027 /* Still cleaning up */
8028 resync = max_sectors;
8029 } else if (resync > max_sectors)
8030 resync = max_sectors;
8032 resync -= atomic_read(&mddev->recovery_active);
8035 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8036 struct md_rdev *rdev;
8038 rdev_for_each(rdev, mddev)
8039 if (rdev->raid_disk >= 0 &&
8040 !test_bit(Faulty, &rdev->flags) &&
8041 rdev->recovery_offset != MaxSector &&
8042 rdev->recovery_offset) {
8043 seq_printf(seq, "\trecover=REMOTE");
8046 if (mddev->reshape_position != MaxSector)
8047 seq_printf(seq, "\treshape=REMOTE");
8049 seq_printf(seq, "\tresync=REMOTE");
8052 if (mddev->recovery_cp < MaxSector) {
8053 seq_printf(seq, "\tresync=PENDING");
8059 seq_printf(seq, "\tresync=DELAYED");
8063 WARN_ON(max_sectors == 0);
8064 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8065 * in a sector_t, and (max_sectors>>scale) will fit in a
8066 * u32, as those are the requirements for sector_div.
8067 * Thus 'scale' must be at least 10
8070 if (sizeof(sector_t) > sizeof(unsigned long)) {
8071 while ( max_sectors/2 > (1ULL<<(scale+32)))
8074 res = (resync>>scale)*1000;
8075 sector_div(res, (u32)((max_sectors>>scale)+1));
8079 int i, x = per_milli/50, y = 20-x;
8080 seq_printf(seq, "[");
8081 for (i = 0; i < x; i++)
8082 seq_printf(seq, "=");
8083 seq_printf(seq, ">");
8084 for (i = 0; i < y; i++)
8085 seq_printf(seq, ".");
8086 seq_printf(seq, "] ");
8088 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8089 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8091 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8093 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8094 "resync" : "recovery"))),
8095 per_milli/10, per_milli % 10,
8096 (unsigned long long) resync/2,
8097 (unsigned long long) max_sectors/2);
8100 * dt: time from mark until now
8101 * db: blocks written from mark until now
8102 * rt: remaining time
8104 * rt is a sector_t, which is always 64bit now. We are keeping
8105 * the original algorithm, but it is not really necessary.
8107 * Original algorithm:
8108 * So we divide before multiply in case it is 32bit and close
8110 * We scale the divisor (db) by 32 to avoid losing precision
8111 * near the end of resync when the number of remaining sectors
8113 * We then divide rt by 32 after multiplying by db to compensate.
8114 * The '+1' avoids division by zero if db is very small.
8116 dt = ((jiffies - mddev->resync_mark) / HZ);
8119 curr_mark_cnt = mddev->curr_mark_cnt;
8120 recovery_active = atomic_read(&mddev->recovery_active);
8121 resync_mark_cnt = mddev->resync_mark_cnt;
8123 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8124 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8126 rt = max_sectors - resync; /* number of remaining sectors */
8127 rt = div64_u64(rt, db/32+1);
8131 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8132 ((unsigned long)rt % 60)/6);
8134 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8138 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8140 struct list_head *tmp;
8142 struct mddev *mddev;
8150 spin_lock(&all_mddevs_lock);
8151 list_for_each(tmp,&all_mddevs)
8153 mddev = list_entry(tmp, struct mddev, all_mddevs);
8155 spin_unlock(&all_mddevs_lock);
8158 spin_unlock(&all_mddevs_lock);
8160 return (void*)2;/* tail */
8164 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8166 struct list_head *tmp;
8167 struct mddev *next_mddev, *mddev = v;
8173 spin_lock(&all_mddevs_lock);
8175 tmp = all_mddevs.next;
8177 tmp = mddev->all_mddevs.next;
8178 if (tmp != &all_mddevs)
8179 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8181 next_mddev = (void*)2;
8184 spin_unlock(&all_mddevs_lock);
8192 static void md_seq_stop(struct seq_file *seq, void *v)
8194 struct mddev *mddev = v;
8196 if (mddev && v != (void*)1 && v != (void*)2)
8200 static int md_seq_show(struct seq_file *seq, void *v)
8202 struct mddev *mddev = v;
8204 struct md_rdev *rdev;
8206 if (v == (void*)1) {
8207 struct md_personality *pers;
8208 seq_printf(seq, "Personalities : ");
8209 spin_lock(&pers_lock);
8210 list_for_each_entry(pers, &pers_list, list)
8211 seq_printf(seq, "[%s] ", pers->name);
8213 spin_unlock(&pers_lock);
8214 seq_printf(seq, "\n");
8215 seq->poll_event = atomic_read(&md_event_count);
8218 if (v == (void*)2) {
8223 spin_lock(&mddev->lock);
8224 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8225 seq_printf(seq, "%s : %sactive", mdname(mddev),
8226 mddev->pers ? "" : "in");
8229 seq_printf(seq, " (read-only)");
8231 seq_printf(seq, " (auto-read-only)");
8232 seq_printf(seq, " %s", mddev->pers->name);
8237 rdev_for_each_rcu(rdev, mddev) {
8238 char b[BDEVNAME_SIZE];
8239 seq_printf(seq, " %s[%d]",
8240 bdevname(rdev->bdev,b), rdev->desc_nr);
8241 if (test_bit(WriteMostly, &rdev->flags))
8242 seq_printf(seq, "(W)");
8243 if (test_bit(Journal, &rdev->flags))
8244 seq_printf(seq, "(J)");
8245 if (test_bit(Faulty, &rdev->flags)) {
8246 seq_printf(seq, "(F)");
8249 if (rdev->raid_disk < 0)
8250 seq_printf(seq, "(S)"); /* spare */
8251 if (test_bit(Replacement, &rdev->flags))
8252 seq_printf(seq, "(R)");
8253 sectors += rdev->sectors;
8257 if (!list_empty(&mddev->disks)) {
8259 seq_printf(seq, "\n %llu blocks",
8260 (unsigned long long)
8261 mddev->array_sectors / 2);
8263 seq_printf(seq, "\n %llu blocks",
8264 (unsigned long long)sectors / 2);
8266 if (mddev->persistent) {
8267 if (mddev->major_version != 0 ||
8268 mddev->minor_version != 90) {
8269 seq_printf(seq," super %d.%d",
8270 mddev->major_version,
8271 mddev->minor_version);
8273 } else if (mddev->external)
8274 seq_printf(seq, " super external:%s",
8275 mddev->metadata_type);
8277 seq_printf(seq, " super non-persistent");
8280 mddev->pers->status(seq, mddev);
8281 seq_printf(seq, "\n ");
8282 if (mddev->pers->sync_request) {
8283 if (status_resync(seq, mddev))
8284 seq_printf(seq, "\n ");
8287 seq_printf(seq, "\n ");
8289 md_bitmap_status(seq, mddev->bitmap);
8291 seq_printf(seq, "\n");
8293 spin_unlock(&mddev->lock);
8298 static const struct seq_operations md_seq_ops = {
8299 .start = md_seq_start,
8300 .next = md_seq_next,
8301 .stop = md_seq_stop,
8302 .show = md_seq_show,
8305 static int md_seq_open(struct inode *inode, struct file *file)
8307 struct seq_file *seq;
8310 error = seq_open(file, &md_seq_ops);
8314 seq = file->private_data;
8315 seq->poll_event = atomic_read(&md_event_count);
8319 static int md_unloading;
8320 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8322 struct seq_file *seq = filp->private_data;
8326 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8327 poll_wait(filp, &md_event_waiters, wait);
8329 /* always allow read */
8330 mask = EPOLLIN | EPOLLRDNORM;
8332 if (seq->poll_event != atomic_read(&md_event_count))
8333 mask |= EPOLLERR | EPOLLPRI;
8337 static const struct proc_ops mdstat_proc_ops = {
8338 .proc_open = md_seq_open,
8339 .proc_read = seq_read,
8340 .proc_lseek = seq_lseek,
8341 .proc_release = seq_release,
8342 .proc_poll = mdstat_poll,
8345 int register_md_personality(struct md_personality *p)
8347 pr_debug("md: %s personality registered for level %d\n",
8349 spin_lock(&pers_lock);
8350 list_add_tail(&p->list, &pers_list);
8351 spin_unlock(&pers_lock);
8354 EXPORT_SYMBOL(register_md_personality);
8356 int unregister_md_personality(struct md_personality *p)
8358 pr_debug("md: %s personality unregistered\n", p->name);
8359 spin_lock(&pers_lock);
8360 list_del_init(&p->list);
8361 spin_unlock(&pers_lock);
8364 EXPORT_SYMBOL(unregister_md_personality);
8366 int register_md_cluster_operations(struct md_cluster_operations *ops,
8367 struct module *module)
8370 spin_lock(&pers_lock);
8371 if (md_cluster_ops != NULL)
8374 md_cluster_ops = ops;
8375 md_cluster_mod = module;
8377 spin_unlock(&pers_lock);
8380 EXPORT_SYMBOL(register_md_cluster_operations);
8382 int unregister_md_cluster_operations(void)
8384 spin_lock(&pers_lock);
8385 md_cluster_ops = NULL;
8386 spin_unlock(&pers_lock);
8389 EXPORT_SYMBOL(unregister_md_cluster_operations);
8391 int md_setup_cluster(struct mddev *mddev, int nodes)
8393 if (!md_cluster_ops)
8394 request_module("md-cluster");
8395 spin_lock(&pers_lock);
8396 /* ensure module won't be unloaded */
8397 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8398 pr_warn("can't find md-cluster module or get it's reference.\n");
8399 spin_unlock(&pers_lock);
8402 spin_unlock(&pers_lock);
8404 return md_cluster_ops->join(mddev, nodes);
8407 void md_cluster_stop(struct mddev *mddev)
8409 if (!md_cluster_ops)
8411 md_cluster_ops->leave(mddev);
8412 module_put(md_cluster_mod);
8415 static int is_mddev_idle(struct mddev *mddev, int init)
8417 struct md_rdev *rdev;
8423 rdev_for_each_rcu(rdev, mddev) {
8424 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8425 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8426 atomic_read(&disk->sync_io);
8427 /* sync IO will cause sync_io to increase before the disk_stats
8428 * as sync_io is counted when a request starts, and
8429 * disk_stats is counted when it completes.
8430 * So resync activity will cause curr_events to be smaller than
8431 * when there was no such activity.
8432 * non-sync IO will cause disk_stat to increase without
8433 * increasing sync_io so curr_events will (eventually)
8434 * be larger than it was before. Once it becomes
8435 * substantially larger, the test below will cause
8436 * the array to appear non-idle, and resync will slow
8438 * If there is a lot of outstanding resync activity when
8439 * we set last_event to curr_events, then all that activity
8440 * completing might cause the array to appear non-idle
8441 * and resync will be slowed down even though there might
8442 * not have been non-resync activity. This will only
8443 * happen once though. 'last_events' will soon reflect
8444 * the state where there is little or no outstanding
8445 * resync requests, and further resync activity will
8446 * always make curr_events less than last_events.
8449 if (init || curr_events - rdev->last_events > 64) {
8450 rdev->last_events = curr_events;
8458 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8460 /* another "blocks" (512byte) blocks have been synced */
8461 atomic_sub(blocks, &mddev->recovery_active);
8462 wake_up(&mddev->recovery_wait);
8464 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8465 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8466 md_wakeup_thread(mddev->thread);
8467 // stop recovery, signal do_sync ....
8470 EXPORT_SYMBOL(md_done_sync);
8472 /* md_write_start(mddev, bi)
8473 * If we need to update some array metadata (e.g. 'active' flag
8474 * in superblock) before writing, schedule a superblock update
8475 * and wait for it to complete.
8476 * A return value of 'false' means that the write wasn't recorded
8477 * and cannot proceed as the array is being suspend.
8479 bool md_write_start(struct mddev *mddev, struct bio *bi)
8483 if (bio_data_dir(bi) != WRITE)
8486 BUG_ON(mddev->ro == 1);
8487 if (mddev->ro == 2) {
8488 /* need to switch to read/write */
8490 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8491 md_wakeup_thread(mddev->thread);
8492 md_wakeup_thread(mddev->sync_thread);
8496 percpu_ref_get(&mddev->writes_pending);
8497 smp_mb(); /* Match smp_mb in set_in_sync() */
8498 if (mddev->safemode == 1)
8499 mddev->safemode = 0;
8500 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8501 if (mddev->in_sync || mddev->sync_checkers) {
8502 spin_lock(&mddev->lock);
8503 if (mddev->in_sync) {
8505 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8506 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8507 md_wakeup_thread(mddev->thread);
8510 spin_unlock(&mddev->lock);
8514 sysfs_notify_dirent_safe(mddev->sysfs_state);
8515 if (!mddev->has_superblocks)
8517 wait_event(mddev->sb_wait,
8518 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8520 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8521 percpu_ref_put(&mddev->writes_pending);
8526 EXPORT_SYMBOL(md_write_start);
8528 /* md_write_inc can only be called when md_write_start() has
8529 * already been called at least once of the current request.
8530 * It increments the counter and is useful when a single request
8531 * is split into several parts. Each part causes an increment and
8532 * so needs a matching md_write_end().
8533 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8534 * a spinlocked region.
8536 void md_write_inc(struct mddev *mddev, struct bio *bi)
8538 if (bio_data_dir(bi) != WRITE)
8540 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8541 percpu_ref_get(&mddev->writes_pending);
8543 EXPORT_SYMBOL(md_write_inc);
8545 void md_write_end(struct mddev *mddev)
8547 percpu_ref_put(&mddev->writes_pending);
8549 if (mddev->safemode == 2)
8550 md_wakeup_thread(mddev->thread);
8551 else if (mddev->safemode_delay)
8552 /* The roundup() ensures this only performs locking once
8553 * every ->safemode_delay jiffies
8555 mod_timer(&mddev->safemode_timer,
8556 roundup(jiffies, mddev->safemode_delay) +
8557 mddev->safemode_delay);
8560 EXPORT_SYMBOL(md_write_end);
8562 /* md_allow_write(mddev)
8563 * Calling this ensures that the array is marked 'active' so that writes
8564 * may proceed without blocking. It is important to call this before
8565 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8566 * Must be called with mddev_lock held.
8568 void md_allow_write(struct mddev *mddev)
8574 if (!mddev->pers->sync_request)
8577 spin_lock(&mddev->lock);
8578 if (mddev->in_sync) {
8580 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8581 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8582 if (mddev->safemode_delay &&
8583 mddev->safemode == 0)
8584 mddev->safemode = 1;
8585 spin_unlock(&mddev->lock);
8586 md_update_sb(mddev, 0);
8587 sysfs_notify_dirent_safe(mddev->sysfs_state);
8588 /* wait for the dirty state to be recorded in the metadata */
8589 wait_event(mddev->sb_wait,
8590 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8592 spin_unlock(&mddev->lock);
8594 EXPORT_SYMBOL_GPL(md_allow_write);
8596 #define SYNC_MARKS 10
8597 #define SYNC_MARK_STEP (3*HZ)
8598 #define UPDATE_FREQUENCY (5*60*HZ)
8599 void md_do_sync(struct md_thread *thread)
8601 struct mddev *mddev = thread->mddev;
8602 struct mddev *mddev2;
8603 unsigned int currspeed = 0, window;
8604 sector_t max_sectors,j, io_sectors, recovery_done;
8605 unsigned long mark[SYNC_MARKS];
8606 unsigned long update_time;
8607 sector_t mark_cnt[SYNC_MARKS];
8609 struct list_head *tmp;
8610 sector_t last_check;
8612 struct md_rdev *rdev;
8613 char *desc, *action = NULL;
8614 struct blk_plug plug;
8617 /* just incase thread restarts... */
8618 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8619 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8621 if (mddev->ro) {/* never try to sync a read-only array */
8622 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8626 if (mddev_is_clustered(mddev)) {
8627 ret = md_cluster_ops->resync_start(mddev);
8631 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8632 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8633 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8634 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8635 && ((unsigned long long)mddev->curr_resync_completed
8636 < (unsigned long long)mddev->resync_max_sectors))
8640 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8641 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8642 desc = "data-check";
8644 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8645 desc = "requested-resync";
8649 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8654 mddev->last_sync_action = action ?: desc;
8656 /* we overload curr_resync somewhat here.
8657 * 0 == not engaged in resync at all
8658 * 2 == checking that there is no conflict with another sync
8659 * 1 == like 2, but have yielded to allow conflicting resync to
8661 * other == active in resync - this many blocks
8663 * Before starting a resync we must have set curr_resync to
8664 * 2, and then checked that every "conflicting" array has curr_resync
8665 * less than ours. When we find one that is the same or higher
8666 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8667 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8668 * This will mean we have to start checking from the beginning again.
8673 int mddev2_minor = -1;
8674 mddev->curr_resync = 2;
8677 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8679 for_each_mddev(mddev2, tmp) {
8680 if (mddev2 == mddev)
8682 if (!mddev->parallel_resync
8683 && mddev2->curr_resync
8684 && match_mddev_units(mddev, mddev2)) {
8686 if (mddev < mddev2 && mddev->curr_resync == 2) {
8687 /* arbitrarily yield */
8688 mddev->curr_resync = 1;
8689 wake_up(&resync_wait);
8691 if (mddev > mddev2 && mddev->curr_resync == 1)
8692 /* no need to wait here, we can wait the next
8693 * time 'round when curr_resync == 2
8696 /* We need to wait 'interruptible' so as not to
8697 * contribute to the load average, and not to
8698 * be caught by 'softlockup'
8700 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8701 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8702 mddev2->curr_resync >= mddev->curr_resync) {
8703 if (mddev2_minor != mddev2->md_minor) {
8704 mddev2_minor = mddev2->md_minor;
8705 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8706 desc, mdname(mddev),
8710 if (signal_pending(current))
8711 flush_signals(current);
8713 finish_wait(&resync_wait, &wq);
8716 finish_wait(&resync_wait, &wq);
8719 } while (mddev->curr_resync < 2);
8722 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8723 /* resync follows the size requested by the personality,
8724 * which defaults to physical size, but can be virtual size
8726 max_sectors = mddev->resync_max_sectors;
8727 atomic64_set(&mddev->resync_mismatches, 0);
8728 /* we don't use the checkpoint if there's a bitmap */
8729 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8730 j = mddev->resync_min;
8731 else if (!mddev->bitmap)
8732 j = mddev->recovery_cp;
8734 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8735 max_sectors = mddev->resync_max_sectors;
8737 * If the original node aborts reshaping then we continue the
8738 * reshaping, so set j again to avoid restart reshape from the
8741 if (mddev_is_clustered(mddev) &&
8742 mddev->reshape_position != MaxSector)
8743 j = mddev->reshape_position;
8745 /* recovery follows the physical size of devices */
8746 max_sectors = mddev->dev_sectors;
8749 rdev_for_each_rcu(rdev, mddev)
8750 if (rdev->raid_disk >= 0 &&
8751 !test_bit(Journal, &rdev->flags) &&
8752 !test_bit(Faulty, &rdev->flags) &&
8753 !test_bit(In_sync, &rdev->flags) &&
8754 rdev->recovery_offset < j)
8755 j = rdev->recovery_offset;
8758 /* If there is a bitmap, we need to make sure all
8759 * writes that started before we added a spare
8760 * complete before we start doing a recovery.
8761 * Otherwise the write might complete and (via
8762 * bitmap_endwrite) set a bit in the bitmap after the
8763 * recovery has checked that bit and skipped that
8766 if (mddev->bitmap) {
8767 mddev->pers->quiesce(mddev, 1);
8768 mddev->pers->quiesce(mddev, 0);
8772 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8773 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8774 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8775 speed_max(mddev), desc);
8777 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8780 for (m = 0; m < SYNC_MARKS; m++) {
8782 mark_cnt[m] = io_sectors;
8785 mddev->resync_mark = mark[last_mark];
8786 mddev->resync_mark_cnt = mark_cnt[last_mark];
8789 * Tune reconstruction:
8791 window = 32 * (PAGE_SIZE / 512);
8792 pr_debug("md: using %dk window, over a total of %lluk.\n",
8793 window/2, (unsigned long long)max_sectors/2);
8795 atomic_set(&mddev->recovery_active, 0);
8799 pr_debug("md: resuming %s of %s from checkpoint.\n",
8800 desc, mdname(mddev));
8801 mddev->curr_resync = j;
8803 mddev->curr_resync = 3; /* no longer delayed */
8804 mddev->curr_resync_completed = j;
8805 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8806 md_new_event(mddev);
8807 update_time = jiffies;
8809 blk_start_plug(&plug);
8810 while (j < max_sectors) {
8815 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8816 ((mddev->curr_resync > mddev->curr_resync_completed &&
8817 (mddev->curr_resync - mddev->curr_resync_completed)
8818 > (max_sectors >> 4)) ||
8819 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8820 (j - mddev->curr_resync_completed)*2
8821 >= mddev->resync_max - mddev->curr_resync_completed ||
8822 mddev->curr_resync_completed > mddev->resync_max
8824 /* time to update curr_resync_completed */
8825 wait_event(mddev->recovery_wait,
8826 atomic_read(&mddev->recovery_active) == 0);
8827 mddev->curr_resync_completed = j;
8828 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8829 j > mddev->recovery_cp)
8830 mddev->recovery_cp = j;
8831 update_time = jiffies;
8832 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8833 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8836 while (j >= mddev->resync_max &&
8837 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8838 /* As this condition is controlled by user-space,
8839 * we can block indefinitely, so use '_interruptible'
8840 * to avoid triggering warnings.
8842 flush_signals(current); /* just in case */
8843 wait_event_interruptible(mddev->recovery_wait,
8844 mddev->resync_max > j
8845 || test_bit(MD_RECOVERY_INTR,
8849 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8852 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8854 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8858 if (!skipped) { /* actual IO requested */
8859 io_sectors += sectors;
8860 atomic_add(sectors, &mddev->recovery_active);
8863 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8867 if (j > max_sectors)
8868 /* when skipping, extra large numbers can be returned. */
8871 mddev->curr_resync = j;
8872 mddev->curr_mark_cnt = io_sectors;
8873 if (last_check == 0)
8874 /* this is the earliest that rebuild will be
8875 * visible in /proc/mdstat
8877 md_new_event(mddev);
8879 if (last_check + window > io_sectors || j == max_sectors)
8882 last_check = io_sectors;
8884 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8886 int next = (last_mark+1) % SYNC_MARKS;
8888 mddev->resync_mark = mark[next];
8889 mddev->resync_mark_cnt = mark_cnt[next];
8890 mark[next] = jiffies;
8891 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8895 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8899 * this loop exits only if either when we are slower than
8900 * the 'hard' speed limit, or the system was IO-idle for
8902 * the system might be non-idle CPU-wise, but we only care
8903 * about not overloading the IO subsystem. (things like an
8904 * e2fsck being done on the RAID array should execute fast)
8908 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8909 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8910 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8912 if (currspeed > speed_min(mddev)) {
8913 if (currspeed > speed_max(mddev)) {
8917 if (!is_mddev_idle(mddev, 0)) {
8919 * Give other IO more of a chance.
8920 * The faster the devices, the less we wait.
8922 wait_event(mddev->recovery_wait,
8923 !atomic_read(&mddev->recovery_active));
8927 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8928 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8929 ? "interrupted" : "done");
8931 * this also signals 'finished resyncing' to md_stop
8933 blk_finish_plug(&plug);
8934 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8936 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8937 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8938 mddev->curr_resync > 3) {
8939 mddev->curr_resync_completed = mddev->curr_resync;
8940 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8942 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8944 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8945 mddev->curr_resync > 3) {
8946 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8947 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8948 if (mddev->curr_resync >= mddev->recovery_cp) {
8949 pr_debug("md: checkpointing %s of %s.\n",
8950 desc, mdname(mddev));
8951 if (test_bit(MD_RECOVERY_ERROR,
8953 mddev->recovery_cp =
8954 mddev->curr_resync_completed;
8956 mddev->recovery_cp =
8960 mddev->recovery_cp = MaxSector;
8962 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8963 mddev->curr_resync = MaxSector;
8964 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8965 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
8967 rdev_for_each_rcu(rdev, mddev)
8968 if (rdev->raid_disk >= 0 &&
8969 mddev->delta_disks >= 0 &&
8970 !test_bit(Journal, &rdev->flags) &&
8971 !test_bit(Faulty, &rdev->flags) &&
8972 !test_bit(In_sync, &rdev->flags) &&
8973 rdev->recovery_offset < mddev->curr_resync)
8974 rdev->recovery_offset = mddev->curr_resync;
8980 /* set CHANGE_PENDING here since maybe another update is needed,
8981 * so other nodes are informed. It should be harmless for normal
8983 set_mask_bits(&mddev->sb_flags, 0,
8984 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8986 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8987 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8988 mddev->delta_disks > 0 &&
8989 mddev->pers->finish_reshape &&
8990 mddev->pers->size &&
8992 mddev_lock_nointr(mddev);
8993 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8994 mddev_unlock(mddev);
8995 if (!mddev_is_clustered(mddev)) {
8996 set_capacity(mddev->gendisk, mddev->array_sectors);
8997 revalidate_disk(mddev->gendisk);
9001 spin_lock(&mddev->lock);
9002 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9003 /* We completed so min/max setting can be forgotten if used. */
9004 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9005 mddev->resync_min = 0;
9006 mddev->resync_max = MaxSector;
9007 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9008 mddev->resync_min = mddev->curr_resync_completed;
9009 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9010 mddev->curr_resync = 0;
9011 spin_unlock(&mddev->lock);
9013 wake_up(&resync_wait);
9014 md_wakeup_thread(mddev->thread);
9017 EXPORT_SYMBOL_GPL(md_do_sync);
9019 static int remove_and_add_spares(struct mddev *mddev,
9020 struct md_rdev *this)
9022 struct md_rdev *rdev;
9025 bool remove_some = false;
9027 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9028 /* Mustn't remove devices when resync thread is running */
9031 rdev_for_each(rdev, mddev) {
9032 if ((this == NULL || rdev == this) &&
9033 rdev->raid_disk >= 0 &&
9034 !test_bit(Blocked, &rdev->flags) &&
9035 test_bit(Faulty, &rdev->flags) &&
9036 atomic_read(&rdev->nr_pending)==0) {
9037 /* Faulty non-Blocked devices with nr_pending == 0
9038 * never get nr_pending incremented,
9039 * never get Faulty cleared, and never get Blocked set.
9040 * So we can synchronize_rcu now rather than once per device
9043 set_bit(RemoveSynchronized, &rdev->flags);
9049 rdev_for_each(rdev, mddev) {
9050 if ((this == NULL || rdev == this) &&
9051 rdev->raid_disk >= 0 &&
9052 !test_bit(Blocked, &rdev->flags) &&
9053 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9054 (!test_bit(In_sync, &rdev->flags) &&
9055 !test_bit(Journal, &rdev->flags))) &&
9056 atomic_read(&rdev->nr_pending)==0)) {
9057 if (mddev->pers->hot_remove_disk(
9058 mddev, rdev) == 0) {
9059 sysfs_unlink_rdev(mddev, rdev);
9060 rdev->saved_raid_disk = rdev->raid_disk;
9061 rdev->raid_disk = -1;
9065 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9066 clear_bit(RemoveSynchronized, &rdev->flags);
9069 if (removed && mddev->kobj.sd)
9070 sysfs_notify(&mddev->kobj, NULL, "degraded");
9072 if (this && removed)
9075 rdev_for_each(rdev, mddev) {
9076 if (this && this != rdev)
9078 if (test_bit(Candidate, &rdev->flags))
9080 if (rdev->raid_disk >= 0 &&
9081 !test_bit(In_sync, &rdev->flags) &&
9082 !test_bit(Journal, &rdev->flags) &&
9083 !test_bit(Faulty, &rdev->flags))
9085 if (rdev->raid_disk >= 0)
9087 if (test_bit(Faulty, &rdev->flags))
9089 if (!test_bit(Journal, &rdev->flags)) {
9091 ! (rdev->saved_raid_disk >= 0 &&
9092 !test_bit(Bitmap_sync, &rdev->flags)))
9095 rdev->recovery_offset = 0;
9097 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9098 if (sysfs_link_rdev(mddev, rdev))
9099 /* failure here is OK */;
9100 if (!test_bit(Journal, &rdev->flags))
9102 md_new_event(mddev);
9103 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9108 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9112 static void md_start_sync(struct work_struct *ws)
9114 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9116 mddev->sync_thread = md_register_thread(md_do_sync,
9119 if (!mddev->sync_thread) {
9120 pr_warn("%s: could not start resync thread...\n",
9122 /* leave the spares where they are, it shouldn't hurt */
9123 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9124 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9125 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9126 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9127 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9128 wake_up(&resync_wait);
9129 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9131 if (mddev->sysfs_action)
9132 sysfs_notify_dirent_safe(mddev->sysfs_action);
9134 md_wakeup_thread(mddev->sync_thread);
9135 sysfs_notify_dirent_safe(mddev->sysfs_action);
9136 md_new_event(mddev);
9140 * This routine is regularly called by all per-raid-array threads to
9141 * deal with generic issues like resync and super-block update.
9142 * Raid personalities that don't have a thread (linear/raid0) do not
9143 * need this as they never do any recovery or update the superblock.
9145 * It does not do any resync itself, but rather "forks" off other threads
9146 * to do that as needed.
9147 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9148 * "->recovery" and create a thread at ->sync_thread.
9149 * When the thread finishes it sets MD_RECOVERY_DONE
9150 * and wakeups up this thread which will reap the thread and finish up.
9151 * This thread also removes any faulty devices (with nr_pending == 0).
9153 * The overall approach is:
9154 * 1/ if the superblock needs updating, update it.
9155 * 2/ If a recovery thread is running, don't do anything else.
9156 * 3/ If recovery has finished, clean up, possibly marking spares active.
9157 * 4/ If there are any faulty devices, remove them.
9158 * 5/ If array is degraded, try to add spares devices
9159 * 6/ If array has spares or is not in-sync, start a resync thread.
9161 void md_check_recovery(struct mddev *mddev)
9163 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9164 /* Write superblock - thread that called mddev_suspend()
9165 * holds reconfig_mutex for us.
9167 set_bit(MD_UPDATING_SB, &mddev->flags);
9168 smp_mb__after_atomic();
9169 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9170 md_update_sb(mddev, 0);
9171 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9172 wake_up(&mddev->sb_wait);
9175 if (mddev->suspended)
9179 md_bitmap_daemon_work(mddev);
9181 if (signal_pending(current)) {
9182 if (mddev->pers->sync_request && !mddev->external) {
9183 pr_debug("md: %s in immediate safe mode\n",
9185 mddev->safemode = 2;
9187 flush_signals(current);
9190 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9193 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9194 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9195 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9196 (mddev->external == 0 && mddev->safemode == 1) ||
9197 (mddev->safemode == 2
9198 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9202 if (mddev_trylock(mddev)) {
9204 bool try_set_sync = mddev->safemode != 0;
9206 if (!mddev->external && mddev->safemode == 1)
9207 mddev->safemode = 0;
9210 struct md_rdev *rdev;
9211 if (!mddev->external && mddev->in_sync)
9212 /* 'Blocked' flag not needed as failed devices
9213 * will be recorded if array switched to read/write.
9214 * Leaving it set will prevent the device
9215 * from being removed.
9217 rdev_for_each(rdev, mddev)
9218 clear_bit(Blocked, &rdev->flags);
9219 /* On a read-only array we can:
9220 * - remove failed devices
9221 * - add already-in_sync devices if the array itself
9223 * As we only add devices that are already in-sync,
9224 * we can activate the spares immediately.
9226 remove_and_add_spares(mddev, NULL);
9227 /* There is no thread, but we need to call
9228 * ->spare_active and clear saved_raid_disk
9230 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9231 md_reap_sync_thread(mddev);
9232 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9233 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9234 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9238 if (mddev_is_clustered(mddev)) {
9239 struct md_rdev *rdev;
9240 /* kick the device if another node issued a
9243 rdev_for_each(rdev, mddev) {
9244 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9245 rdev->raid_disk < 0)
9246 md_kick_rdev_from_array(rdev);
9250 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9251 spin_lock(&mddev->lock);
9253 spin_unlock(&mddev->lock);
9256 if (mddev->sb_flags)
9257 md_update_sb(mddev, 0);
9259 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9260 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9261 /* resync/recovery still happening */
9262 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9265 if (mddev->sync_thread) {
9266 md_reap_sync_thread(mddev);
9269 /* Set RUNNING before clearing NEEDED to avoid
9270 * any transients in the value of "sync_action".
9272 mddev->curr_resync_completed = 0;
9273 spin_lock(&mddev->lock);
9274 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9275 spin_unlock(&mddev->lock);
9276 /* Clear some bits that don't mean anything, but
9279 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9280 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9282 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9283 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9285 /* no recovery is running.
9286 * remove any failed drives, then
9287 * add spares if possible.
9288 * Spares are also removed and re-added, to allow
9289 * the personality to fail the re-add.
9292 if (mddev->reshape_position != MaxSector) {
9293 if (mddev->pers->check_reshape == NULL ||
9294 mddev->pers->check_reshape(mddev) != 0)
9295 /* Cannot proceed */
9297 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9298 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9299 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9300 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9301 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9302 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9303 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9304 } else if (mddev->recovery_cp < MaxSector) {
9305 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9306 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9307 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9308 /* nothing to be done ... */
9311 if (mddev->pers->sync_request) {
9313 /* We are adding a device or devices to an array
9314 * which has the bitmap stored on all devices.
9315 * So make sure all bitmap pages get written
9317 md_bitmap_write_all(mddev->bitmap);
9319 INIT_WORK(&mddev->del_work, md_start_sync);
9320 queue_work(md_misc_wq, &mddev->del_work);
9324 if (!mddev->sync_thread) {
9325 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9326 wake_up(&resync_wait);
9327 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9329 if (mddev->sysfs_action)
9330 sysfs_notify_dirent_safe(mddev->sysfs_action);
9333 wake_up(&mddev->sb_wait);
9334 mddev_unlock(mddev);
9337 EXPORT_SYMBOL(md_check_recovery);
9339 void md_reap_sync_thread(struct mddev *mddev)
9341 struct md_rdev *rdev;
9342 sector_t old_dev_sectors = mddev->dev_sectors;
9343 bool is_reshaped = false;
9345 /* resync has finished, collect result */
9346 md_unregister_thread(&mddev->sync_thread);
9347 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9348 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9349 mddev->degraded != mddev->raid_disks) {
9351 /* activate any spares */
9352 if (mddev->pers->spare_active(mddev)) {
9353 sysfs_notify(&mddev->kobj, NULL,
9355 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9358 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9359 mddev->pers->finish_reshape) {
9360 mddev->pers->finish_reshape(mddev);
9361 if (mddev_is_clustered(mddev))
9365 /* If array is no-longer degraded, then any saved_raid_disk
9366 * information must be scrapped.
9368 if (!mddev->degraded)
9369 rdev_for_each(rdev, mddev)
9370 rdev->saved_raid_disk = -1;
9372 md_update_sb(mddev, 1);
9373 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9374 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9376 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9377 md_cluster_ops->resync_finish(mddev);
9378 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9379 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9380 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9381 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9382 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9383 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9385 * We call md_cluster_ops->update_size here because sync_size could
9386 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9387 * so it is time to update size across cluster.
9389 if (mddev_is_clustered(mddev) && is_reshaped
9390 && !test_bit(MD_CLOSING, &mddev->flags))
9391 md_cluster_ops->update_size(mddev, old_dev_sectors);
9392 wake_up(&resync_wait);
9393 /* flag recovery needed just to double check */
9394 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9395 sysfs_notify_dirent_safe(mddev->sysfs_action);
9396 md_new_event(mddev);
9397 if (mddev->event_work.func)
9398 queue_work(md_misc_wq, &mddev->event_work);
9400 EXPORT_SYMBOL(md_reap_sync_thread);
9402 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9404 sysfs_notify_dirent_safe(rdev->sysfs_state);
9405 wait_event_timeout(rdev->blocked_wait,
9406 !test_bit(Blocked, &rdev->flags) &&
9407 !test_bit(BlockedBadBlocks, &rdev->flags),
9408 msecs_to_jiffies(5000));
9409 rdev_dec_pending(rdev, mddev);
9411 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9413 void md_finish_reshape(struct mddev *mddev)
9415 /* called be personality module when reshape completes. */
9416 struct md_rdev *rdev;
9418 rdev_for_each(rdev, mddev) {
9419 if (rdev->data_offset > rdev->new_data_offset)
9420 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9422 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9423 rdev->data_offset = rdev->new_data_offset;
9426 EXPORT_SYMBOL(md_finish_reshape);
9428 /* Bad block management */
9430 /* Returns 1 on success, 0 on failure */
9431 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9434 struct mddev *mddev = rdev->mddev;
9437 s += rdev->new_data_offset;
9439 s += rdev->data_offset;
9440 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9442 /* Make sure they get written out promptly */
9443 if (test_bit(ExternalBbl, &rdev->flags))
9444 sysfs_notify(&rdev->kobj, NULL,
9445 "unacknowledged_bad_blocks");
9446 sysfs_notify_dirent_safe(rdev->sysfs_state);
9447 set_mask_bits(&mddev->sb_flags, 0,
9448 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9449 md_wakeup_thread(rdev->mddev->thread);
9454 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9456 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9461 s += rdev->new_data_offset;
9463 s += rdev->data_offset;
9464 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9465 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9466 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9469 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9471 static int md_notify_reboot(struct notifier_block *this,
9472 unsigned long code, void *x)
9474 struct list_head *tmp;
9475 struct mddev *mddev;
9478 for_each_mddev(mddev, tmp) {
9479 if (mddev_trylock(mddev)) {
9481 __md_stop_writes(mddev);
9482 if (mddev->persistent)
9483 mddev->safemode = 2;
9484 mddev_unlock(mddev);
9489 * certain more exotic SCSI devices are known to be
9490 * volatile wrt too early system reboots. While the
9491 * right place to handle this issue is the given
9492 * driver, we do want to have a safe RAID driver ...
9500 static struct notifier_block md_notifier = {
9501 .notifier_call = md_notify_reboot,
9503 .priority = INT_MAX, /* before any real devices */
9506 static void md_geninit(void)
9508 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9510 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9513 static int __init md_init(void)
9517 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9521 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9525 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9527 goto err_rdev_misc_wq;
9529 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9532 if ((ret = register_blkdev(0, "mdp")) < 0)
9536 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9537 md_probe, NULL, NULL);
9538 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9539 md_probe, NULL, NULL);
9541 register_reboot_notifier(&md_notifier);
9542 raid_table_header = register_sysctl_table(raid_root_table);
9548 unregister_blkdev(MD_MAJOR, "md");
9550 destroy_workqueue(md_rdev_misc_wq);
9552 destroy_workqueue(md_misc_wq);
9554 destroy_workqueue(md_wq);
9559 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9561 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9562 struct md_rdev *rdev2;
9564 char b[BDEVNAME_SIZE];
9567 * If size is changed in another node then we need to
9568 * do resize as well.
9570 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9571 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9573 pr_info("md-cluster: resize failed\n");
9575 md_bitmap_update_sb(mddev->bitmap);
9578 /* Check for change of roles in the active devices */
9579 rdev_for_each(rdev2, mddev) {
9580 if (test_bit(Faulty, &rdev2->flags))
9583 /* Check if the roles changed */
9584 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9586 if (test_bit(Candidate, &rdev2->flags)) {
9587 if (role == 0xfffe) {
9588 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9589 md_kick_rdev_from_array(rdev2);
9593 clear_bit(Candidate, &rdev2->flags);
9596 if (role != rdev2->raid_disk) {
9598 * got activated except reshape is happening.
9600 if (rdev2->raid_disk == -1 && role != 0xffff &&
9601 !(le32_to_cpu(sb->feature_map) &
9602 MD_FEATURE_RESHAPE_ACTIVE)) {
9603 rdev2->saved_raid_disk = role;
9604 ret = remove_and_add_spares(mddev, rdev2);
9605 pr_info("Activated spare: %s\n",
9606 bdevname(rdev2->bdev,b));
9607 /* wakeup mddev->thread here, so array could
9608 * perform resync with the new activated disk */
9609 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9610 md_wakeup_thread(mddev->thread);
9613 * We just want to do the minimum to mark the disk
9614 * as faulty. The recovery is performed by the
9615 * one who initiated the error.
9617 if ((role == 0xfffe) || (role == 0xfffd)) {
9618 md_error(mddev, rdev2);
9619 clear_bit(Blocked, &rdev2->flags);
9624 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9625 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9628 * Since mddev->delta_disks has already updated in update_raid_disks,
9629 * so it is time to check reshape.
9631 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9632 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9634 * reshape is happening in the remote node, we need to
9635 * update reshape_position and call start_reshape.
9637 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9638 if (mddev->pers->update_reshape_pos)
9639 mddev->pers->update_reshape_pos(mddev);
9640 if (mddev->pers->start_reshape)
9641 mddev->pers->start_reshape(mddev);
9642 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9643 mddev->reshape_position != MaxSector &&
9644 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9645 /* reshape is just done in another node. */
9646 mddev->reshape_position = MaxSector;
9647 if (mddev->pers->update_reshape_pos)
9648 mddev->pers->update_reshape_pos(mddev);
9651 /* Finally set the event to be up to date */
9652 mddev->events = le64_to_cpu(sb->events);
9655 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9658 struct page *swapout = rdev->sb_page;
9659 struct mdp_superblock_1 *sb;
9661 /* Store the sb page of the rdev in the swapout temporary
9662 * variable in case we err in the future
9664 rdev->sb_page = NULL;
9665 err = alloc_disk_sb(rdev);
9667 ClearPageUptodate(rdev->sb_page);
9668 rdev->sb_loaded = 0;
9669 err = super_types[mddev->major_version].
9670 load_super(rdev, NULL, mddev->minor_version);
9673 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9674 __func__, __LINE__, rdev->desc_nr, err);
9676 put_page(rdev->sb_page);
9677 rdev->sb_page = swapout;
9678 rdev->sb_loaded = 1;
9682 sb = page_address(rdev->sb_page);
9683 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9687 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9688 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9690 /* The other node finished recovery, call spare_active to set
9691 * device In_sync and mddev->degraded
9693 if (rdev->recovery_offset == MaxSector &&
9694 !test_bit(In_sync, &rdev->flags) &&
9695 mddev->pers->spare_active(mddev))
9696 sysfs_notify(&mddev->kobj, NULL, "degraded");
9702 void md_reload_sb(struct mddev *mddev, int nr)
9704 struct md_rdev *rdev;
9708 rdev_for_each_rcu(rdev, mddev) {
9709 if (rdev->desc_nr == nr)
9713 if (!rdev || rdev->desc_nr != nr) {
9714 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9718 err = read_rdev(mddev, rdev);
9722 check_sb_changes(mddev, rdev);
9724 /* Read all rdev's to update recovery_offset */
9725 rdev_for_each_rcu(rdev, mddev) {
9726 if (!test_bit(Faulty, &rdev->flags))
9727 read_rdev(mddev, rdev);
9730 EXPORT_SYMBOL(md_reload_sb);
9735 * Searches all registered partitions for autorun RAID arrays
9739 static DEFINE_MUTEX(detected_devices_mutex);
9740 static LIST_HEAD(all_detected_devices);
9741 struct detected_devices_node {
9742 struct list_head list;
9746 void md_autodetect_dev(dev_t dev)
9748 struct detected_devices_node *node_detected_dev;
9750 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9751 if (node_detected_dev) {
9752 node_detected_dev->dev = dev;
9753 mutex_lock(&detected_devices_mutex);
9754 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9755 mutex_unlock(&detected_devices_mutex);
9759 static void autostart_arrays(int part)
9761 struct md_rdev *rdev;
9762 struct detected_devices_node *node_detected_dev;
9764 int i_scanned, i_passed;
9769 pr_info("md: Autodetecting RAID arrays.\n");
9771 mutex_lock(&detected_devices_mutex);
9772 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9774 node_detected_dev = list_entry(all_detected_devices.next,
9775 struct detected_devices_node, list);
9776 list_del(&node_detected_dev->list);
9777 dev = node_detected_dev->dev;
9778 kfree(node_detected_dev);
9779 mutex_unlock(&detected_devices_mutex);
9780 rdev = md_import_device(dev,0, 90);
9781 mutex_lock(&detected_devices_mutex);
9785 if (test_bit(Faulty, &rdev->flags))
9788 set_bit(AutoDetected, &rdev->flags);
9789 list_add(&rdev->same_set, &pending_raid_disks);
9792 mutex_unlock(&detected_devices_mutex);
9794 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9796 autorun_devices(part);
9799 #endif /* !MODULE */
9801 static __exit void md_exit(void)
9803 struct mddev *mddev;
9804 struct list_head *tmp;
9807 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9808 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9810 unregister_blkdev(MD_MAJOR,"md");
9811 unregister_blkdev(mdp_major, "mdp");
9812 unregister_reboot_notifier(&md_notifier);
9813 unregister_sysctl_table(raid_table_header);
9815 /* We cannot unload the modules while some process is
9816 * waiting for us in select() or poll() - wake them up
9819 while (waitqueue_active(&md_event_waiters)) {
9820 /* not safe to leave yet */
9821 wake_up(&md_event_waiters);
9825 remove_proc_entry("mdstat", NULL);
9827 for_each_mddev(mddev, tmp) {
9828 export_array(mddev);
9830 mddev->hold_active = 0;
9832 * for_each_mddev() will call mddev_put() at the end of each
9833 * iteration. As the mddev is now fully clear, this will
9834 * schedule the mddev for destruction by a workqueue, and the
9835 * destroy_workqueue() below will wait for that to complete.
9838 destroy_workqueue(md_rdev_misc_wq);
9839 destroy_workqueue(md_misc_wq);
9840 destroy_workqueue(md_wq);
9843 subsys_initcall(md_init);
9844 module_exit(md_exit)
9846 static int get_ro(char *buffer, const struct kernel_param *kp)
9848 return sprintf(buffer, "%d\n", start_readonly);
9850 static int set_ro(const char *val, const struct kernel_param *kp)
9852 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9855 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9856 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9857 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9858 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9860 MODULE_LICENSE("GPL");
9861 MODULE_DESCRIPTION("MD RAID framework");
9863 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);