1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/blk-integrity.h>
45 #include <linux/badblocks.h>
46 #include <linux/sysctl.h>
47 #include <linux/seq_file.h>
49 #include <linux/poll.h>
50 #include <linux/ctype.h>
51 #include <linux/string.h>
52 #include <linux/hdreg.h>
53 #include <linux/proc_fs.h>
54 #include <linux/random.h>
55 #include <linux/major.h>
56 #include <linux/module.h>
57 #include <linux/reboot.h>
58 #include <linux/file.h>
59 #include <linux/compat.h>
60 #include <linux/delay.h>
61 #include <linux/raid/md_p.h>
62 #include <linux/raid/md_u.h>
63 #include <linux/raid/detect.h>
64 #include <linux/slab.h>
65 #include <linux/percpu-refcount.h>
66 #include <linux/part_stat.h>
68 #include <trace/events/block.h>
70 #include "md-bitmap.h"
71 #include "md-cluster.h"
73 /* pers_list is a list of registered personalities protected
75 * pers_lock does extra service to protect accesses to
76 * mddev->thread when the mutex cannot be held.
78 static LIST_HEAD(pers_list);
79 static DEFINE_SPINLOCK(pers_lock);
81 static const struct kobj_type md_ktype;
83 struct md_cluster_operations *md_cluster_ops;
84 EXPORT_SYMBOL(md_cluster_ops);
85 static struct module *md_cluster_mod;
87 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
88 static struct workqueue_struct *md_wq;
89 static struct workqueue_struct *md_misc_wq;
90 static struct workqueue_struct *md_rdev_misc_wq;
92 static int remove_and_add_spares(struct mddev *mddev,
93 struct md_rdev *this);
94 static void mddev_detach(struct mddev *mddev);
97 * Default number of read corrections we'll attempt on an rdev
98 * before ejecting it from the array. We divide the read error
99 * count by 2 for every hour elapsed between read errors.
101 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
102 /* Default safemode delay: 200 msec */
103 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
105 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
106 * is 1000 KB/sec, so the extra system load does not show up that much.
107 * Increase it if you want to have more _guaranteed_ speed. Note that
108 * the RAID driver will use the maximum available bandwidth if the IO
109 * subsystem is idle. There is also an 'absolute maximum' reconstruction
110 * speed limit - in case reconstruction slows down your system despite
113 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
114 * or /sys/block/mdX/md/sync_speed_{min,max}
117 static int sysctl_speed_limit_min = 1000;
118 static int sysctl_speed_limit_max = 200000;
119 static inline int speed_min(struct mddev *mddev)
121 return mddev->sync_speed_min ?
122 mddev->sync_speed_min : sysctl_speed_limit_min;
125 static inline int speed_max(struct mddev *mddev)
127 return mddev->sync_speed_max ?
128 mddev->sync_speed_max : sysctl_speed_limit_max;
131 static void rdev_uninit_serial(struct md_rdev *rdev)
133 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
136 kvfree(rdev->serial);
140 static void rdevs_uninit_serial(struct mddev *mddev)
142 struct md_rdev *rdev;
144 rdev_for_each(rdev, mddev)
145 rdev_uninit_serial(rdev);
148 static int rdev_init_serial(struct md_rdev *rdev)
150 /* serial_nums equals with BARRIER_BUCKETS_NR */
151 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
152 struct serial_in_rdev *serial = NULL;
154 if (test_bit(CollisionCheck, &rdev->flags))
157 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
162 for (i = 0; i < serial_nums; i++) {
163 struct serial_in_rdev *serial_tmp = &serial[i];
165 spin_lock_init(&serial_tmp->serial_lock);
166 serial_tmp->serial_rb = RB_ROOT_CACHED;
167 init_waitqueue_head(&serial_tmp->serial_io_wait);
170 rdev->serial = serial;
171 set_bit(CollisionCheck, &rdev->flags);
176 static int rdevs_init_serial(struct mddev *mddev)
178 struct md_rdev *rdev;
181 rdev_for_each(rdev, mddev) {
182 ret = rdev_init_serial(rdev);
187 /* Free all resources if pool is not existed */
188 if (ret && !mddev->serial_info_pool)
189 rdevs_uninit_serial(mddev);
195 * rdev needs to enable serial stuffs if it meets the conditions:
196 * 1. it is multi-queue device flaged with writemostly.
197 * 2. the write-behind mode is enabled.
199 static int rdev_need_serial(struct md_rdev *rdev)
201 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
202 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
203 test_bit(WriteMostly, &rdev->flags));
207 * Init resource for rdev(s), then create serial_info_pool if:
208 * 1. rdev is the first device which return true from rdev_enable_serial.
209 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
211 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
216 if (rdev && !rdev_need_serial(rdev) &&
217 !test_bit(CollisionCheck, &rdev->flags))
221 mddev_suspend(mddev);
224 ret = rdevs_init_serial(mddev);
226 ret = rdev_init_serial(rdev);
230 if (mddev->serial_info_pool == NULL) {
232 * already in memalloc noio context by
235 mddev->serial_info_pool =
236 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
237 sizeof(struct serial_info));
238 if (!mddev->serial_info_pool) {
239 rdevs_uninit_serial(mddev);
240 pr_err("can't alloc memory pool for serialization\n");
250 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
251 * 1. rdev is the last device flaged with CollisionCheck.
252 * 2. when bitmap is destroyed while policy is not enabled.
253 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
255 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
258 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
261 if (mddev->serial_info_pool) {
262 struct md_rdev *temp;
263 int num = 0; /* used to track if other rdevs need the pool */
266 mddev_suspend(mddev);
267 rdev_for_each(temp, mddev) {
269 if (!mddev->serialize_policy ||
270 !rdev_need_serial(temp))
271 rdev_uninit_serial(temp);
274 } else if (temp != rdev &&
275 test_bit(CollisionCheck, &temp->flags))
280 rdev_uninit_serial(rdev);
283 pr_info("The mempool could be used by other devices\n");
285 mempool_destroy(mddev->serial_info_pool);
286 mddev->serial_info_pool = NULL;
293 static struct ctl_table_header *raid_table_header;
295 static struct ctl_table raid_table[] = {
297 .procname = "speed_limit_min",
298 .data = &sysctl_speed_limit_min,
299 .maxlen = sizeof(int),
300 .mode = S_IRUGO|S_IWUSR,
301 .proc_handler = proc_dointvec,
304 .procname = "speed_limit_max",
305 .data = &sysctl_speed_limit_max,
306 .maxlen = sizeof(int),
307 .mode = S_IRUGO|S_IWUSR,
308 .proc_handler = proc_dointvec,
313 static int start_readonly;
316 * The original mechanism for creating an md device is to create
317 * a device node in /dev and to open it. This causes races with device-close.
318 * The preferred method is to write to the "new_array" module parameter.
319 * This can avoid races.
320 * Setting create_on_open to false disables the original mechanism
321 * so all the races disappear.
323 static bool create_on_open = true;
326 * We have a system wide 'event count' that is incremented
327 * on any 'interesting' event, and readers of /proc/mdstat
328 * can use 'poll' or 'select' to find out when the event
332 * start array, stop array, error, add device, remove device,
333 * start build, activate spare
335 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
336 static atomic_t md_event_count;
337 void md_new_event(void)
339 atomic_inc(&md_event_count);
340 wake_up(&md_event_waiters);
342 EXPORT_SYMBOL_GPL(md_new_event);
345 * Enables to iterate over all existing md arrays
346 * all_mddevs_lock protects this list.
348 static LIST_HEAD(all_mddevs);
349 static DEFINE_SPINLOCK(all_mddevs_lock);
351 /* Rather than calling directly into the personality make_request function,
352 * IO requests come here first so that we can check if the device is
353 * being suspended pending a reconfiguration.
354 * We hold a refcount over the call to ->make_request. By the time that
355 * call has finished, the bio has been linked into some internal structure
356 * and so is visible to ->quiesce(), so we don't need the refcount any more.
358 static bool is_suspended(struct mddev *mddev, struct bio *bio)
360 if (is_md_suspended(mddev))
362 if (bio_data_dir(bio) != WRITE)
364 if (mddev->suspend_lo >= mddev->suspend_hi)
366 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
368 if (bio_end_sector(bio) < mddev->suspend_lo)
373 void md_handle_request(struct mddev *mddev, struct bio *bio)
376 if (is_suspended(mddev, bio)) {
378 /* Bail out if REQ_NOWAIT is set for the bio */
379 if (bio->bi_opf & REQ_NOWAIT) {
380 bio_wouldblock_error(bio);
384 prepare_to_wait(&mddev->sb_wait, &__wait,
385 TASK_UNINTERRUPTIBLE);
386 if (!is_suspended(mddev, bio))
390 finish_wait(&mddev->sb_wait, &__wait);
392 if (!percpu_ref_tryget_live(&mddev->active_io))
393 goto check_suspended;
395 if (!mddev->pers->make_request(mddev, bio)) {
396 percpu_ref_put(&mddev->active_io);
397 goto check_suspended;
400 percpu_ref_put(&mddev->active_io);
402 EXPORT_SYMBOL(md_handle_request);
404 static void md_submit_bio(struct bio *bio)
406 const int rw = bio_data_dir(bio);
407 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
409 if (mddev == NULL || mddev->pers == NULL) {
414 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
419 bio = bio_split_to_limits(bio);
423 if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) {
424 if (bio_sectors(bio) != 0)
425 bio->bi_status = BLK_STS_IOERR;
430 /* bio could be mergeable after passing to underlayer */
431 bio->bi_opf &= ~REQ_NOMERGE;
433 md_handle_request(mddev, bio);
436 /* mddev_suspend makes sure no new requests are submitted
437 * to the device, and that any requests that have been submitted
438 * are completely handled.
439 * Once mddev_detach() is called and completes, the module will be
442 void mddev_suspend(struct mddev *mddev)
444 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
445 lockdep_assert_held(&mddev->reconfig_mutex);
446 if (mddev->suspended++)
448 wake_up(&mddev->sb_wait);
449 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
450 percpu_ref_kill(&mddev->active_io);
451 wait_event(mddev->sb_wait, percpu_ref_is_zero(&mddev->active_io));
452 mddev->pers->quiesce(mddev, 1);
453 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
454 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
456 del_timer_sync(&mddev->safemode_timer);
457 /* restrict memory reclaim I/O during raid array is suspend */
458 mddev->noio_flag = memalloc_noio_save();
460 EXPORT_SYMBOL_GPL(mddev_suspend);
462 void mddev_resume(struct mddev *mddev)
464 /* entred the memalloc scope from mddev_suspend() */
465 memalloc_noio_restore(mddev->noio_flag);
466 lockdep_assert_held(&mddev->reconfig_mutex);
467 if (--mddev->suspended)
469 percpu_ref_resurrect(&mddev->active_io);
470 wake_up(&mddev->sb_wait);
471 mddev->pers->quiesce(mddev, 0);
473 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
474 md_wakeup_thread(mddev->thread);
475 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
477 EXPORT_SYMBOL_GPL(mddev_resume);
480 * Generic flush handling for md
483 static void md_end_flush(struct bio *bio)
485 struct md_rdev *rdev = bio->bi_private;
486 struct mddev *mddev = rdev->mddev;
490 rdev_dec_pending(rdev, mddev);
492 if (atomic_dec_and_test(&mddev->flush_pending)) {
493 /* The pre-request flush has finished */
494 queue_work(md_wq, &mddev->flush_work);
498 static void md_submit_flush_data(struct work_struct *ws);
500 static void submit_flushes(struct work_struct *ws)
502 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
503 struct md_rdev *rdev;
505 mddev->start_flush = ktime_get_boottime();
506 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
507 atomic_set(&mddev->flush_pending, 1);
509 rdev_for_each_rcu(rdev, mddev)
510 if (rdev->raid_disk >= 0 &&
511 !test_bit(Faulty, &rdev->flags)) {
512 /* Take two references, one is dropped
513 * when request finishes, one after
514 * we reclaim rcu_read_lock
517 atomic_inc(&rdev->nr_pending);
518 atomic_inc(&rdev->nr_pending);
520 bi = bio_alloc_bioset(rdev->bdev, 0,
521 REQ_OP_WRITE | REQ_PREFLUSH,
522 GFP_NOIO, &mddev->bio_set);
523 bi->bi_end_io = md_end_flush;
524 bi->bi_private = rdev;
525 atomic_inc(&mddev->flush_pending);
528 rdev_dec_pending(rdev, mddev);
531 if (atomic_dec_and_test(&mddev->flush_pending))
532 queue_work(md_wq, &mddev->flush_work);
535 static void md_submit_flush_data(struct work_struct *ws)
537 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
538 struct bio *bio = mddev->flush_bio;
541 * must reset flush_bio before calling into md_handle_request to avoid a
542 * deadlock, because other bios passed md_handle_request suspend check
543 * could wait for this and below md_handle_request could wait for those
544 * bios because of suspend check
546 spin_lock_irq(&mddev->lock);
547 mddev->prev_flush_start = mddev->start_flush;
548 mddev->flush_bio = NULL;
549 spin_unlock_irq(&mddev->lock);
550 wake_up(&mddev->sb_wait);
552 if (bio->bi_iter.bi_size == 0) {
553 /* an empty barrier - all done */
556 bio->bi_opf &= ~REQ_PREFLUSH;
557 md_handle_request(mddev, bio);
562 * Manages consolidation of flushes and submitting any flushes needed for
563 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
564 * being finished in another context. Returns false if the flushing is
565 * complete but still needs the I/O portion of the bio to be processed.
567 bool md_flush_request(struct mddev *mddev, struct bio *bio)
569 ktime_t req_start = ktime_get_boottime();
570 spin_lock_irq(&mddev->lock);
571 /* flush requests wait until ongoing flush completes,
572 * hence coalescing all the pending requests.
574 wait_event_lock_irq(mddev->sb_wait,
576 ktime_before(req_start, mddev->prev_flush_start),
578 /* new request after previous flush is completed */
579 if (ktime_after(req_start, mddev->prev_flush_start)) {
580 WARN_ON(mddev->flush_bio);
581 mddev->flush_bio = bio;
584 spin_unlock_irq(&mddev->lock);
587 INIT_WORK(&mddev->flush_work, submit_flushes);
588 queue_work(md_wq, &mddev->flush_work);
590 /* flush was performed for some other bio while we waited. */
591 if (bio->bi_iter.bi_size == 0)
592 /* an empty barrier - all done */
595 bio->bi_opf &= ~REQ_PREFLUSH;
601 EXPORT_SYMBOL(md_flush_request);
603 static inline struct mddev *mddev_get(struct mddev *mddev)
605 lockdep_assert_held(&all_mddevs_lock);
607 if (test_bit(MD_DELETED, &mddev->flags))
609 atomic_inc(&mddev->active);
613 static void mddev_delayed_delete(struct work_struct *ws);
615 void mddev_put(struct mddev *mddev)
617 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
619 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
620 mddev->ctime == 0 && !mddev->hold_active) {
621 /* Array is not configured at all, and not held active,
623 set_bit(MD_DELETED, &mddev->flags);
626 * Call queue_work inside the spinlock so that
627 * flush_workqueue() after mddev_find will succeed in waiting
628 * for the work to be done.
630 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
631 queue_work(md_misc_wq, &mddev->del_work);
633 spin_unlock(&all_mddevs_lock);
636 static void md_safemode_timeout(struct timer_list *t);
638 void mddev_init(struct mddev *mddev)
640 mutex_init(&mddev->open_mutex);
641 mutex_init(&mddev->reconfig_mutex);
642 mutex_init(&mddev->bitmap_info.mutex);
643 INIT_LIST_HEAD(&mddev->disks);
644 INIT_LIST_HEAD(&mddev->all_mddevs);
645 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
646 atomic_set(&mddev->active, 1);
647 atomic_set(&mddev->openers, 0);
648 spin_lock_init(&mddev->lock);
649 atomic_set(&mddev->flush_pending, 0);
650 init_waitqueue_head(&mddev->sb_wait);
651 init_waitqueue_head(&mddev->recovery_wait);
652 mddev->reshape_position = MaxSector;
653 mddev->reshape_backwards = 0;
654 mddev->last_sync_action = "none";
655 mddev->resync_min = 0;
656 mddev->resync_max = MaxSector;
657 mddev->level = LEVEL_NONE;
659 EXPORT_SYMBOL_GPL(mddev_init);
661 static struct mddev *mddev_find_locked(dev_t unit)
665 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
666 if (mddev->unit == unit)
672 /* find an unused unit number */
673 static dev_t mddev_alloc_unit(void)
675 static int next_minor = 512;
676 int start = next_minor;
681 dev = MKDEV(MD_MAJOR, next_minor);
683 if (next_minor > MINORMASK)
685 if (next_minor == start)
686 return 0; /* Oh dear, all in use. */
687 is_free = !mddev_find_locked(dev);
693 static struct mddev *mddev_alloc(dev_t unit)
698 if (unit && MAJOR(unit) != MD_MAJOR)
699 unit &= ~((1 << MdpMinorShift) - 1);
701 new = kzalloc(sizeof(*new), GFP_KERNEL);
703 return ERR_PTR(-ENOMEM);
706 spin_lock(&all_mddevs_lock);
709 if (mddev_find_locked(unit))
712 if (MAJOR(unit) == MD_MAJOR)
713 new->md_minor = MINOR(unit);
715 new->md_minor = MINOR(unit) >> MdpMinorShift;
716 new->hold_active = UNTIL_IOCTL;
719 new->unit = mddev_alloc_unit();
722 new->md_minor = MINOR(new->unit);
723 new->hold_active = UNTIL_STOP;
726 list_add(&new->all_mddevs, &all_mddevs);
727 spin_unlock(&all_mddevs_lock);
730 spin_unlock(&all_mddevs_lock);
732 return ERR_PTR(error);
735 static void mddev_free(struct mddev *mddev)
737 spin_lock(&all_mddevs_lock);
738 list_del(&mddev->all_mddevs);
739 spin_unlock(&all_mddevs_lock);
744 static const struct attribute_group md_redundancy_group;
746 void mddev_unlock(struct mddev *mddev)
748 if (mddev->to_remove) {
749 /* These cannot be removed under reconfig_mutex as
750 * an access to the files will try to take reconfig_mutex
751 * while holding the file unremovable, which leads to
753 * So hold set sysfs_active while the remove in happeing,
754 * and anything else which might set ->to_remove or my
755 * otherwise change the sysfs namespace will fail with
756 * -EBUSY if sysfs_active is still set.
757 * We set sysfs_active under reconfig_mutex and elsewhere
758 * test it under the same mutex to ensure its correct value
761 const struct attribute_group *to_remove = mddev->to_remove;
762 mddev->to_remove = NULL;
763 mddev->sysfs_active = 1;
764 mutex_unlock(&mddev->reconfig_mutex);
766 if (mddev->kobj.sd) {
767 if (to_remove != &md_redundancy_group)
768 sysfs_remove_group(&mddev->kobj, to_remove);
769 if (mddev->pers == NULL ||
770 mddev->pers->sync_request == NULL) {
771 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
772 if (mddev->sysfs_action)
773 sysfs_put(mddev->sysfs_action);
774 if (mddev->sysfs_completed)
775 sysfs_put(mddev->sysfs_completed);
776 if (mddev->sysfs_degraded)
777 sysfs_put(mddev->sysfs_degraded);
778 mddev->sysfs_action = NULL;
779 mddev->sysfs_completed = NULL;
780 mddev->sysfs_degraded = NULL;
783 mddev->sysfs_active = 0;
785 mutex_unlock(&mddev->reconfig_mutex);
787 /* As we've dropped the mutex we need a spinlock to
788 * make sure the thread doesn't disappear
790 spin_lock(&pers_lock);
791 md_wakeup_thread(mddev->thread);
792 wake_up(&mddev->sb_wait);
793 spin_unlock(&pers_lock);
795 EXPORT_SYMBOL_GPL(mddev_unlock);
797 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
799 struct md_rdev *rdev;
801 rdev_for_each_rcu(rdev, mddev)
802 if (rdev->desc_nr == nr)
807 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
809 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
811 struct md_rdev *rdev;
813 rdev_for_each(rdev, mddev)
814 if (rdev->bdev->bd_dev == dev)
820 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
822 struct md_rdev *rdev;
824 rdev_for_each_rcu(rdev, mddev)
825 if (rdev->bdev->bd_dev == dev)
830 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
832 static struct md_personality *find_pers(int level, char *clevel)
834 struct md_personality *pers;
835 list_for_each_entry(pers, &pers_list, list) {
836 if (level != LEVEL_NONE && pers->level == level)
838 if (strcmp(pers->name, clevel)==0)
844 /* return the offset of the super block in 512byte sectors */
845 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
847 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
850 static int alloc_disk_sb(struct md_rdev *rdev)
852 rdev->sb_page = alloc_page(GFP_KERNEL);
858 void md_rdev_clear(struct md_rdev *rdev)
861 put_page(rdev->sb_page);
863 rdev->sb_page = NULL;
868 put_page(rdev->bb_page);
869 rdev->bb_page = NULL;
871 badblocks_exit(&rdev->badblocks);
873 EXPORT_SYMBOL_GPL(md_rdev_clear);
875 static void super_written(struct bio *bio)
877 struct md_rdev *rdev = bio->bi_private;
878 struct mddev *mddev = rdev->mddev;
880 if (bio->bi_status) {
881 pr_err("md: %s gets error=%d\n", __func__,
882 blk_status_to_errno(bio->bi_status));
883 md_error(mddev, rdev);
884 if (!test_bit(Faulty, &rdev->flags)
885 && (bio->bi_opf & MD_FAILFAST)) {
886 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
887 set_bit(LastDev, &rdev->flags);
890 clear_bit(LastDev, &rdev->flags);
894 rdev_dec_pending(rdev, mddev);
896 if (atomic_dec_and_test(&mddev->pending_writes))
897 wake_up(&mddev->sb_wait);
900 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
901 sector_t sector, int size, struct page *page)
903 /* write first size bytes of page to sector of rdev
904 * Increment mddev->pending_writes before returning
905 * and decrement it on completion, waking up sb_wait
906 * if zero is reached.
907 * If an error occurred, call md_error
914 if (test_bit(Faulty, &rdev->flags))
917 bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
919 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA,
920 GFP_NOIO, &mddev->sync_set);
922 atomic_inc(&rdev->nr_pending);
924 bio->bi_iter.bi_sector = sector;
925 __bio_add_page(bio, page, size, 0);
926 bio->bi_private = rdev;
927 bio->bi_end_io = super_written;
929 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
930 test_bit(FailFast, &rdev->flags) &&
931 !test_bit(LastDev, &rdev->flags))
932 bio->bi_opf |= MD_FAILFAST;
934 atomic_inc(&mddev->pending_writes);
938 int md_super_wait(struct mddev *mddev)
940 /* wait for all superblock writes that were scheduled to complete */
941 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
942 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
947 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
948 struct page *page, blk_opf_t opf, bool metadata_op)
953 if (metadata_op && rdev->meta_bdev)
954 bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
956 bio_init(&bio, rdev->bdev, &bvec, 1, opf);
959 bio.bi_iter.bi_sector = sector + rdev->sb_start;
960 else if (rdev->mddev->reshape_position != MaxSector &&
961 (rdev->mddev->reshape_backwards ==
962 (sector >= rdev->mddev->reshape_position)))
963 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
965 bio.bi_iter.bi_sector = sector + rdev->data_offset;
966 __bio_add_page(&bio, page, size, 0);
968 submit_bio_wait(&bio);
970 return !bio.bi_status;
972 EXPORT_SYMBOL_GPL(sync_page_io);
974 static int read_disk_sb(struct md_rdev *rdev, int size)
979 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true))
985 pr_err("md: disabled device %pg, could not read superblock.\n",
990 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
992 return sb1->set_uuid0 == sb2->set_uuid0 &&
993 sb1->set_uuid1 == sb2->set_uuid1 &&
994 sb1->set_uuid2 == sb2->set_uuid2 &&
995 sb1->set_uuid3 == sb2->set_uuid3;
998 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1001 mdp_super_t *tmp1, *tmp2;
1003 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1004 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1006 if (!tmp1 || !tmp2) {
1015 * nr_disks is not constant
1020 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1027 static u32 md_csum_fold(u32 csum)
1029 csum = (csum & 0xffff) + (csum >> 16);
1030 return (csum & 0xffff) + (csum >> 16);
1033 static unsigned int calc_sb_csum(mdp_super_t *sb)
1036 u32 *sb32 = (u32*)sb;
1038 unsigned int disk_csum, csum;
1040 disk_csum = sb->sb_csum;
1043 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1045 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1048 /* This used to use csum_partial, which was wrong for several
1049 * reasons including that different results are returned on
1050 * different architectures. It isn't critical that we get exactly
1051 * the same return value as before (we always csum_fold before
1052 * testing, and that removes any differences). However as we
1053 * know that csum_partial always returned a 16bit value on
1054 * alphas, do a fold to maximise conformity to previous behaviour.
1056 sb->sb_csum = md_csum_fold(disk_csum);
1058 sb->sb_csum = disk_csum;
1064 * Handle superblock details.
1065 * We want to be able to handle multiple superblock formats
1066 * so we have a common interface to them all, and an array of
1067 * different handlers.
1068 * We rely on user-space to write the initial superblock, and support
1069 * reading and updating of superblocks.
1070 * Interface methods are:
1071 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1072 * loads and validates a superblock on dev.
1073 * if refdev != NULL, compare superblocks on both devices
1075 * 0 - dev has a superblock that is compatible with refdev
1076 * 1 - dev has a superblock that is compatible and newer than refdev
1077 * so dev should be used as the refdev in future
1078 * -EINVAL superblock incompatible or invalid
1079 * -othererror e.g. -EIO
1081 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1082 * Verify that dev is acceptable into mddev.
1083 * The first time, mddev->raid_disks will be 0, and data from
1084 * dev should be merged in. Subsequent calls check that dev
1085 * is new enough. Return 0 or -EINVAL
1087 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1088 * Update the superblock for rdev with data in mddev
1089 * This does not write to disc.
1095 struct module *owner;
1096 int (*load_super)(struct md_rdev *rdev,
1097 struct md_rdev *refdev,
1099 int (*validate_super)(struct mddev *mddev,
1100 struct md_rdev *rdev);
1101 void (*sync_super)(struct mddev *mddev,
1102 struct md_rdev *rdev);
1103 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1104 sector_t num_sectors);
1105 int (*allow_new_offset)(struct md_rdev *rdev,
1106 unsigned long long new_offset);
1110 * Check that the given mddev has no bitmap.
1112 * This function is called from the run method of all personalities that do not
1113 * support bitmaps. It prints an error message and returns non-zero if mddev
1114 * has a bitmap. Otherwise, it returns 0.
1117 int md_check_no_bitmap(struct mddev *mddev)
1119 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1121 pr_warn("%s: bitmaps are not supported for %s\n",
1122 mdname(mddev), mddev->pers->name);
1125 EXPORT_SYMBOL(md_check_no_bitmap);
1128 * load_super for 0.90.0
1130 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1134 bool spare_disk = true;
1137 * Calculate the position of the superblock (512byte sectors),
1138 * it's at the end of the disk.
1140 * It also happens to be a multiple of 4Kb.
1142 rdev->sb_start = calc_dev_sboffset(rdev);
1144 ret = read_disk_sb(rdev, MD_SB_BYTES);
1150 sb = page_address(rdev->sb_page);
1152 if (sb->md_magic != MD_SB_MAGIC) {
1153 pr_warn("md: invalid raid superblock magic on %pg\n",
1158 if (sb->major_version != 0 ||
1159 sb->minor_version < 90 ||
1160 sb->minor_version > 91) {
1161 pr_warn("Bad version number %d.%d on %pg\n",
1162 sb->major_version, sb->minor_version, rdev->bdev);
1166 if (sb->raid_disks <= 0)
1169 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1170 pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
1174 rdev->preferred_minor = sb->md_minor;
1175 rdev->data_offset = 0;
1176 rdev->new_data_offset = 0;
1177 rdev->sb_size = MD_SB_BYTES;
1178 rdev->badblocks.shift = -1;
1180 if (sb->level == LEVEL_MULTIPATH)
1183 rdev->desc_nr = sb->this_disk.number;
1185 /* not spare disk, or LEVEL_MULTIPATH */
1186 if (sb->level == LEVEL_MULTIPATH ||
1187 (rdev->desc_nr >= 0 &&
1188 rdev->desc_nr < MD_SB_DISKS &&
1189 sb->disks[rdev->desc_nr].state &
1190 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1200 mdp_super_t *refsb = page_address(refdev->sb_page);
1201 if (!md_uuid_equal(refsb, sb)) {
1202 pr_warn("md: %pg has different UUID to %pg\n",
1203 rdev->bdev, refdev->bdev);
1206 if (!md_sb_equal(refsb, sb)) {
1207 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1208 rdev->bdev, refdev->bdev);
1212 ev2 = md_event(refsb);
1214 if (!spare_disk && ev1 > ev2)
1219 rdev->sectors = rdev->sb_start;
1220 /* Limit to 4TB as metadata cannot record more than that.
1221 * (not needed for Linear and RAID0 as metadata doesn't
1224 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1225 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1227 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1228 /* "this cannot possibly happen" ... */
1236 * validate_super for 0.90.0
1238 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1241 mdp_super_t *sb = page_address(rdev->sb_page);
1242 __u64 ev1 = md_event(sb);
1244 rdev->raid_disk = -1;
1245 clear_bit(Faulty, &rdev->flags);
1246 clear_bit(In_sync, &rdev->flags);
1247 clear_bit(Bitmap_sync, &rdev->flags);
1248 clear_bit(WriteMostly, &rdev->flags);
1250 if (mddev->raid_disks == 0) {
1251 mddev->major_version = 0;
1252 mddev->minor_version = sb->minor_version;
1253 mddev->patch_version = sb->patch_version;
1254 mddev->external = 0;
1255 mddev->chunk_sectors = sb->chunk_size >> 9;
1256 mddev->ctime = sb->ctime;
1257 mddev->utime = sb->utime;
1258 mddev->level = sb->level;
1259 mddev->clevel[0] = 0;
1260 mddev->layout = sb->layout;
1261 mddev->raid_disks = sb->raid_disks;
1262 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1263 mddev->events = ev1;
1264 mddev->bitmap_info.offset = 0;
1265 mddev->bitmap_info.space = 0;
1266 /* bitmap can use 60 K after the 4K superblocks */
1267 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1268 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1269 mddev->reshape_backwards = 0;
1271 if (mddev->minor_version >= 91) {
1272 mddev->reshape_position = sb->reshape_position;
1273 mddev->delta_disks = sb->delta_disks;
1274 mddev->new_level = sb->new_level;
1275 mddev->new_layout = sb->new_layout;
1276 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1277 if (mddev->delta_disks < 0)
1278 mddev->reshape_backwards = 1;
1280 mddev->reshape_position = MaxSector;
1281 mddev->delta_disks = 0;
1282 mddev->new_level = mddev->level;
1283 mddev->new_layout = mddev->layout;
1284 mddev->new_chunk_sectors = mddev->chunk_sectors;
1286 if (mddev->level == 0)
1289 if (sb->state & (1<<MD_SB_CLEAN))
1290 mddev->recovery_cp = MaxSector;
1292 if (sb->events_hi == sb->cp_events_hi &&
1293 sb->events_lo == sb->cp_events_lo) {
1294 mddev->recovery_cp = sb->recovery_cp;
1296 mddev->recovery_cp = 0;
1299 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1300 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1301 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1302 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1304 mddev->max_disks = MD_SB_DISKS;
1306 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1307 mddev->bitmap_info.file == NULL) {
1308 mddev->bitmap_info.offset =
1309 mddev->bitmap_info.default_offset;
1310 mddev->bitmap_info.space =
1311 mddev->bitmap_info.default_space;
1314 } else if (mddev->pers == NULL) {
1315 /* Insist on good event counter while assembling, except
1316 * for spares (which don't need an event count) */
1318 if (sb->disks[rdev->desc_nr].state & (
1319 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1320 if (ev1 < mddev->events)
1322 } else if (mddev->bitmap) {
1323 /* if adding to array with a bitmap, then we can accept an
1324 * older device ... but not too old.
1326 if (ev1 < mddev->bitmap->events_cleared)
1328 if (ev1 < mddev->events)
1329 set_bit(Bitmap_sync, &rdev->flags);
1331 if (ev1 < mddev->events)
1332 /* just a hot-add of a new device, leave raid_disk at -1 */
1336 if (mddev->level != LEVEL_MULTIPATH) {
1337 desc = sb->disks + rdev->desc_nr;
1339 if (desc->state & (1<<MD_DISK_FAULTY))
1340 set_bit(Faulty, &rdev->flags);
1341 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1342 desc->raid_disk < mddev->raid_disks */) {
1343 set_bit(In_sync, &rdev->flags);
1344 rdev->raid_disk = desc->raid_disk;
1345 rdev->saved_raid_disk = desc->raid_disk;
1346 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1347 /* active but not in sync implies recovery up to
1348 * reshape position. We don't know exactly where
1349 * that is, so set to zero for now */
1350 if (mddev->minor_version >= 91) {
1351 rdev->recovery_offset = 0;
1352 rdev->raid_disk = desc->raid_disk;
1355 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1356 set_bit(WriteMostly, &rdev->flags);
1357 if (desc->state & (1<<MD_DISK_FAILFAST))
1358 set_bit(FailFast, &rdev->flags);
1359 } else /* MULTIPATH are always insync */
1360 set_bit(In_sync, &rdev->flags);
1365 * sync_super for 0.90.0
1367 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1370 struct md_rdev *rdev2;
1371 int next_spare = mddev->raid_disks;
1373 /* make rdev->sb match mddev data..
1376 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1377 * 3/ any empty disks < next_spare become removed
1379 * disks[0] gets initialised to REMOVED because
1380 * we cannot be sure from other fields if it has
1381 * been initialised or not.
1384 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1386 rdev->sb_size = MD_SB_BYTES;
1388 sb = page_address(rdev->sb_page);
1390 memset(sb, 0, sizeof(*sb));
1392 sb->md_magic = MD_SB_MAGIC;
1393 sb->major_version = mddev->major_version;
1394 sb->patch_version = mddev->patch_version;
1395 sb->gvalid_words = 0; /* ignored */
1396 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1397 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1398 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1399 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1401 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1402 sb->level = mddev->level;
1403 sb->size = mddev->dev_sectors / 2;
1404 sb->raid_disks = mddev->raid_disks;
1405 sb->md_minor = mddev->md_minor;
1406 sb->not_persistent = 0;
1407 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1409 sb->events_hi = (mddev->events>>32);
1410 sb->events_lo = (u32)mddev->events;
1412 if (mddev->reshape_position == MaxSector)
1413 sb->minor_version = 90;
1415 sb->minor_version = 91;
1416 sb->reshape_position = mddev->reshape_position;
1417 sb->new_level = mddev->new_level;
1418 sb->delta_disks = mddev->delta_disks;
1419 sb->new_layout = mddev->new_layout;
1420 sb->new_chunk = mddev->new_chunk_sectors << 9;
1422 mddev->minor_version = sb->minor_version;
1425 sb->recovery_cp = mddev->recovery_cp;
1426 sb->cp_events_hi = (mddev->events>>32);
1427 sb->cp_events_lo = (u32)mddev->events;
1428 if (mddev->recovery_cp == MaxSector)
1429 sb->state = (1<< MD_SB_CLEAN);
1431 sb->recovery_cp = 0;
1433 sb->layout = mddev->layout;
1434 sb->chunk_size = mddev->chunk_sectors << 9;
1436 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1437 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1439 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1440 rdev_for_each(rdev2, mddev) {
1443 int is_active = test_bit(In_sync, &rdev2->flags);
1445 if (rdev2->raid_disk >= 0 &&
1446 sb->minor_version >= 91)
1447 /* we have nowhere to store the recovery_offset,
1448 * but if it is not below the reshape_position,
1449 * we can piggy-back on that.
1452 if (rdev2->raid_disk < 0 ||
1453 test_bit(Faulty, &rdev2->flags))
1456 desc_nr = rdev2->raid_disk;
1458 desc_nr = next_spare++;
1459 rdev2->desc_nr = desc_nr;
1460 d = &sb->disks[rdev2->desc_nr];
1462 d->number = rdev2->desc_nr;
1463 d->major = MAJOR(rdev2->bdev->bd_dev);
1464 d->minor = MINOR(rdev2->bdev->bd_dev);
1466 d->raid_disk = rdev2->raid_disk;
1468 d->raid_disk = rdev2->desc_nr; /* compatibility */
1469 if (test_bit(Faulty, &rdev2->flags))
1470 d->state = (1<<MD_DISK_FAULTY);
1471 else if (is_active) {
1472 d->state = (1<<MD_DISK_ACTIVE);
1473 if (test_bit(In_sync, &rdev2->flags))
1474 d->state |= (1<<MD_DISK_SYNC);
1482 if (test_bit(WriteMostly, &rdev2->flags))
1483 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1484 if (test_bit(FailFast, &rdev2->flags))
1485 d->state |= (1<<MD_DISK_FAILFAST);
1487 /* now set the "removed" and "faulty" bits on any missing devices */
1488 for (i=0 ; i < mddev->raid_disks ; i++) {
1489 mdp_disk_t *d = &sb->disks[i];
1490 if (d->state == 0 && d->number == 0) {
1493 d->state = (1<<MD_DISK_REMOVED);
1494 d->state |= (1<<MD_DISK_FAULTY);
1498 sb->nr_disks = nr_disks;
1499 sb->active_disks = active;
1500 sb->working_disks = working;
1501 sb->failed_disks = failed;
1502 sb->spare_disks = spare;
1504 sb->this_disk = sb->disks[rdev->desc_nr];
1505 sb->sb_csum = calc_sb_csum(sb);
1509 * rdev_size_change for 0.90.0
1511 static unsigned long long
1512 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1514 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1515 return 0; /* component must fit device */
1516 if (rdev->mddev->bitmap_info.offset)
1517 return 0; /* can't move bitmap */
1518 rdev->sb_start = calc_dev_sboffset(rdev);
1519 if (!num_sectors || num_sectors > rdev->sb_start)
1520 num_sectors = rdev->sb_start;
1521 /* Limit to 4TB as metadata cannot record more than that.
1522 * 4TB == 2^32 KB, or 2*2^32 sectors.
1524 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1525 num_sectors = (sector_t)(2ULL << 32) - 2;
1527 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1529 } while (md_super_wait(rdev->mddev) < 0);
1534 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1536 /* non-zero offset changes not possible with v0.90 */
1537 return new_offset == 0;
1541 * version 1 superblock
1544 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1548 unsigned long long newcsum;
1549 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1550 __le32 *isuper = (__le32*)sb;
1552 disk_csum = sb->sb_csum;
1555 for (; size >= 4; size -= 4)
1556 newcsum += le32_to_cpu(*isuper++);
1559 newcsum += le16_to_cpu(*(__le16*) isuper);
1561 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1562 sb->sb_csum = disk_csum;
1563 return cpu_to_le32(csum);
1566 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1568 struct mdp_superblock_1 *sb;
1573 bool spare_disk = true;
1576 * Calculate the position of the superblock in 512byte sectors.
1577 * It is always aligned to a 4K boundary and
1578 * depeding on minor_version, it can be:
1579 * 0: At least 8K, but less than 12K, from end of device
1580 * 1: At start of device
1581 * 2: 4K from start of device.
1583 switch(minor_version) {
1585 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1586 sb_start &= ~(sector_t)(4*2-1);
1597 rdev->sb_start = sb_start;
1599 /* superblock is rarely larger than 1K, but it can be larger,
1600 * and it is safe to read 4k, so we do that
1602 ret = read_disk_sb(rdev, 4096);
1603 if (ret) return ret;
1605 sb = page_address(rdev->sb_page);
1607 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1608 sb->major_version != cpu_to_le32(1) ||
1609 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1610 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1611 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1614 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1615 pr_warn("md: invalid superblock checksum on %pg\n",
1619 if (le64_to_cpu(sb->data_size) < 10) {
1620 pr_warn("md: data_size too small on %pg\n",
1626 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1627 /* Some padding is non-zero, might be a new feature */
1630 rdev->preferred_minor = 0xffff;
1631 rdev->data_offset = le64_to_cpu(sb->data_offset);
1632 rdev->new_data_offset = rdev->data_offset;
1633 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1634 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1635 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1636 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1638 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1639 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1640 if (rdev->sb_size & bmask)
1641 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1644 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1647 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1650 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1653 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1655 if (!rdev->bb_page) {
1656 rdev->bb_page = alloc_page(GFP_KERNEL);
1660 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1661 rdev->badblocks.count == 0) {
1662 /* need to load the bad block list.
1663 * Currently we limit it to one page.
1669 int sectors = le16_to_cpu(sb->bblog_size);
1670 if (sectors > (PAGE_SIZE / 512))
1672 offset = le32_to_cpu(sb->bblog_offset);
1675 bb_sector = (long long)offset;
1676 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1677 rdev->bb_page, REQ_OP_READ, true))
1679 bbp = (__le64 *)page_address(rdev->bb_page);
1680 rdev->badblocks.shift = sb->bblog_shift;
1681 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1682 u64 bb = le64_to_cpu(*bbp);
1683 int count = bb & (0x3ff);
1684 u64 sector = bb >> 10;
1685 sector <<= sb->bblog_shift;
1686 count <<= sb->bblog_shift;
1689 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1692 } else if (sb->bblog_offset != 0)
1693 rdev->badblocks.shift = 0;
1695 if ((le32_to_cpu(sb->feature_map) &
1696 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1697 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1698 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1699 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1702 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1706 /* not spare disk, or LEVEL_MULTIPATH */
1707 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1708 (rdev->desc_nr >= 0 &&
1709 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1710 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1711 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1721 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1723 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1724 sb->level != refsb->level ||
1725 sb->layout != refsb->layout ||
1726 sb->chunksize != refsb->chunksize) {
1727 pr_warn("md: %pg has strangely different superblock to %pg\n",
1732 ev1 = le64_to_cpu(sb->events);
1733 ev2 = le64_to_cpu(refsb->events);
1735 if (!spare_disk && ev1 > ev2)
1741 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1743 sectors = rdev->sb_start;
1744 if (sectors < le64_to_cpu(sb->data_size))
1746 rdev->sectors = le64_to_cpu(sb->data_size);
1750 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1752 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1753 __u64 ev1 = le64_to_cpu(sb->events);
1755 rdev->raid_disk = -1;
1756 clear_bit(Faulty, &rdev->flags);
1757 clear_bit(In_sync, &rdev->flags);
1758 clear_bit(Bitmap_sync, &rdev->flags);
1759 clear_bit(WriteMostly, &rdev->flags);
1761 if (mddev->raid_disks == 0) {
1762 mddev->major_version = 1;
1763 mddev->patch_version = 0;
1764 mddev->external = 0;
1765 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1766 mddev->ctime = le64_to_cpu(sb->ctime);
1767 mddev->utime = le64_to_cpu(sb->utime);
1768 mddev->level = le32_to_cpu(sb->level);
1769 mddev->clevel[0] = 0;
1770 mddev->layout = le32_to_cpu(sb->layout);
1771 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1772 mddev->dev_sectors = le64_to_cpu(sb->size);
1773 mddev->events = ev1;
1774 mddev->bitmap_info.offset = 0;
1775 mddev->bitmap_info.space = 0;
1776 /* Default location for bitmap is 1K after superblock
1777 * using 3K - total of 4K
1779 mddev->bitmap_info.default_offset = 1024 >> 9;
1780 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1781 mddev->reshape_backwards = 0;
1783 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1784 memcpy(mddev->uuid, sb->set_uuid, 16);
1786 mddev->max_disks = (4096-256)/2;
1788 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1789 mddev->bitmap_info.file == NULL) {
1790 mddev->bitmap_info.offset =
1791 (__s32)le32_to_cpu(sb->bitmap_offset);
1792 /* Metadata doesn't record how much space is available.
1793 * For 1.0, we assume we can use up to the superblock
1794 * if before, else to 4K beyond superblock.
1795 * For others, assume no change is possible.
1797 if (mddev->minor_version > 0)
1798 mddev->bitmap_info.space = 0;
1799 else if (mddev->bitmap_info.offset > 0)
1800 mddev->bitmap_info.space =
1801 8 - mddev->bitmap_info.offset;
1803 mddev->bitmap_info.space =
1804 -mddev->bitmap_info.offset;
1807 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1808 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1809 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1810 mddev->new_level = le32_to_cpu(sb->new_level);
1811 mddev->new_layout = le32_to_cpu(sb->new_layout);
1812 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1813 if (mddev->delta_disks < 0 ||
1814 (mddev->delta_disks == 0 &&
1815 (le32_to_cpu(sb->feature_map)
1816 & MD_FEATURE_RESHAPE_BACKWARDS)))
1817 mddev->reshape_backwards = 1;
1819 mddev->reshape_position = MaxSector;
1820 mddev->delta_disks = 0;
1821 mddev->new_level = mddev->level;
1822 mddev->new_layout = mddev->layout;
1823 mddev->new_chunk_sectors = mddev->chunk_sectors;
1826 if (mddev->level == 0 &&
1827 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1830 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1831 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1833 if (le32_to_cpu(sb->feature_map) &
1834 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1835 if (le32_to_cpu(sb->feature_map) &
1836 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1838 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1839 (le32_to_cpu(sb->feature_map) &
1840 MD_FEATURE_MULTIPLE_PPLS))
1842 set_bit(MD_HAS_PPL, &mddev->flags);
1844 } else if (mddev->pers == NULL) {
1845 /* Insist of good event counter while assembling, except for
1846 * spares (which don't need an event count) */
1848 if (rdev->desc_nr >= 0 &&
1849 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1850 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1851 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1852 if (ev1 < mddev->events)
1854 } else if (mddev->bitmap) {
1855 /* If adding to array with a bitmap, then we can accept an
1856 * older device, but not too old.
1858 if (ev1 < mddev->bitmap->events_cleared)
1860 if (ev1 < mddev->events)
1861 set_bit(Bitmap_sync, &rdev->flags);
1863 if (ev1 < mddev->events)
1864 /* just a hot-add of a new device, leave raid_disk at -1 */
1867 if (mddev->level != LEVEL_MULTIPATH) {
1869 if (rdev->desc_nr < 0 ||
1870 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1871 role = MD_DISK_ROLE_SPARE;
1874 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1876 case MD_DISK_ROLE_SPARE: /* spare */
1878 case MD_DISK_ROLE_FAULTY: /* faulty */
1879 set_bit(Faulty, &rdev->flags);
1881 case MD_DISK_ROLE_JOURNAL: /* journal device */
1882 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1883 /* journal device without journal feature */
1884 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1887 set_bit(Journal, &rdev->flags);
1888 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1889 rdev->raid_disk = 0;
1892 rdev->saved_raid_disk = role;
1893 if ((le32_to_cpu(sb->feature_map) &
1894 MD_FEATURE_RECOVERY_OFFSET)) {
1895 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1896 if (!(le32_to_cpu(sb->feature_map) &
1897 MD_FEATURE_RECOVERY_BITMAP))
1898 rdev->saved_raid_disk = -1;
1901 * If the array is FROZEN, then the device can't
1902 * be in_sync with rest of array.
1904 if (!test_bit(MD_RECOVERY_FROZEN,
1906 set_bit(In_sync, &rdev->flags);
1908 rdev->raid_disk = role;
1911 if (sb->devflags & WriteMostly1)
1912 set_bit(WriteMostly, &rdev->flags);
1913 if (sb->devflags & FailFast1)
1914 set_bit(FailFast, &rdev->flags);
1915 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1916 set_bit(Replacement, &rdev->flags);
1917 } else /* MULTIPATH are always insync */
1918 set_bit(In_sync, &rdev->flags);
1923 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1925 struct mdp_superblock_1 *sb;
1926 struct md_rdev *rdev2;
1928 /* make rdev->sb match mddev and rdev data. */
1930 sb = page_address(rdev->sb_page);
1932 sb->feature_map = 0;
1934 sb->recovery_offset = cpu_to_le64(0);
1935 memset(sb->pad3, 0, sizeof(sb->pad3));
1937 sb->utime = cpu_to_le64((__u64)mddev->utime);
1938 sb->events = cpu_to_le64(mddev->events);
1940 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1941 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1942 sb->resync_offset = cpu_to_le64(MaxSector);
1944 sb->resync_offset = cpu_to_le64(0);
1946 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1948 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1949 sb->size = cpu_to_le64(mddev->dev_sectors);
1950 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1951 sb->level = cpu_to_le32(mddev->level);
1952 sb->layout = cpu_to_le32(mddev->layout);
1953 if (test_bit(FailFast, &rdev->flags))
1954 sb->devflags |= FailFast1;
1956 sb->devflags &= ~FailFast1;
1958 if (test_bit(WriteMostly, &rdev->flags))
1959 sb->devflags |= WriteMostly1;
1961 sb->devflags &= ~WriteMostly1;
1962 sb->data_offset = cpu_to_le64(rdev->data_offset);
1963 sb->data_size = cpu_to_le64(rdev->sectors);
1965 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1966 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1967 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1970 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1971 !test_bit(In_sync, &rdev->flags)) {
1973 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1974 sb->recovery_offset =
1975 cpu_to_le64(rdev->recovery_offset);
1976 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1978 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1980 /* Note: recovery_offset and journal_tail share space */
1981 if (test_bit(Journal, &rdev->flags))
1982 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1983 if (test_bit(Replacement, &rdev->flags))
1985 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1987 if (mddev->reshape_position != MaxSector) {
1988 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1989 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1990 sb->new_layout = cpu_to_le32(mddev->new_layout);
1991 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1992 sb->new_level = cpu_to_le32(mddev->new_level);
1993 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1994 if (mddev->delta_disks == 0 &&
1995 mddev->reshape_backwards)
1997 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1998 if (rdev->new_data_offset != rdev->data_offset) {
2000 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2001 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2002 - rdev->data_offset));
2006 if (mddev_is_clustered(mddev))
2007 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2009 if (rdev->badblocks.count == 0)
2010 /* Nothing to do for bad blocks*/ ;
2011 else if (sb->bblog_offset == 0)
2012 /* Cannot record bad blocks on this device */
2013 md_error(mddev, rdev);
2015 struct badblocks *bb = &rdev->badblocks;
2016 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2018 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2023 seq = read_seqbegin(&bb->lock);
2025 memset(bbp, 0xff, PAGE_SIZE);
2027 for (i = 0 ; i < bb->count ; i++) {
2028 u64 internal_bb = p[i];
2029 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2030 | BB_LEN(internal_bb));
2031 bbp[i] = cpu_to_le64(store_bb);
2034 if (read_seqretry(&bb->lock, seq))
2037 bb->sector = (rdev->sb_start +
2038 (int)le32_to_cpu(sb->bblog_offset));
2039 bb->size = le16_to_cpu(sb->bblog_size);
2044 rdev_for_each(rdev2, mddev)
2045 if (rdev2->desc_nr+1 > max_dev)
2046 max_dev = rdev2->desc_nr+1;
2048 if (max_dev > le32_to_cpu(sb->max_dev)) {
2050 sb->max_dev = cpu_to_le32(max_dev);
2051 rdev->sb_size = max_dev * 2 + 256;
2052 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2053 if (rdev->sb_size & bmask)
2054 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2056 max_dev = le32_to_cpu(sb->max_dev);
2058 for (i=0; i<max_dev;i++)
2059 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2061 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2062 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2064 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2065 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2067 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2069 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2070 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2071 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2074 rdev_for_each(rdev2, mddev) {
2076 if (test_bit(Faulty, &rdev2->flags))
2077 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2078 else if (test_bit(In_sync, &rdev2->flags))
2079 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2080 else if (test_bit(Journal, &rdev2->flags))
2081 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2082 else if (rdev2->raid_disk >= 0)
2083 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2085 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2088 sb->sb_csum = calc_sb_1_csum(sb);
2091 static sector_t super_1_choose_bm_space(sector_t dev_size)
2095 /* if the device is bigger than 8Gig, save 64k for bitmap
2096 * usage, if bigger than 200Gig, save 128k
2098 if (dev_size < 64*2)
2100 else if (dev_size - 64*2 >= 200*1024*1024*2)
2102 else if (dev_size - 4*2 > 8*1024*1024*2)
2109 static unsigned long long
2110 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2112 struct mdp_superblock_1 *sb;
2113 sector_t max_sectors;
2114 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2115 return 0; /* component must fit device */
2116 if (rdev->data_offset != rdev->new_data_offset)
2117 return 0; /* too confusing */
2118 if (rdev->sb_start < rdev->data_offset) {
2119 /* minor versions 1 and 2; superblock before data */
2120 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2121 if (!num_sectors || num_sectors > max_sectors)
2122 num_sectors = max_sectors;
2123 } else if (rdev->mddev->bitmap_info.offset) {
2124 /* minor version 0 with bitmap we can't move */
2127 /* minor version 0; superblock after data */
2128 sector_t sb_start, bm_space;
2129 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2131 /* 8K is for superblock */
2132 sb_start = dev_size - 8*2;
2133 sb_start &= ~(sector_t)(4*2 - 1);
2135 bm_space = super_1_choose_bm_space(dev_size);
2137 /* Space that can be used to store date needs to decrease
2138 * superblock bitmap space and bad block space(4K)
2140 max_sectors = sb_start - bm_space - 4*2;
2142 if (!num_sectors || num_sectors > max_sectors)
2143 num_sectors = max_sectors;
2144 rdev->sb_start = sb_start;
2146 sb = page_address(rdev->sb_page);
2147 sb->data_size = cpu_to_le64(num_sectors);
2148 sb->super_offset = cpu_to_le64(rdev->sb_start);
2149 sb->sb_csum = calc_sb_1_csum(sb);
2151 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2153 } while (md_super_wait(rdev->mddev) < 0);
2159 super_1_allow_new_offset(struct md_rdev *rdev,
2160 unsigned long long new_offset)
2162 /* All necessary checks on new >= old have been done */
2163 struct bitmap *bitmap;
2164 if (new_offset >= rdev->data_offset)
2167 /* with 1.0 metadata, there is no metadata to tread on
2168 * so we can always move back */
2169 if (rdev->mddev->minor_version == 0)
2172 /* otherwise we must be sure not to step on
2173 * any metadata, so stay:
2174 * 36K beyond start of superblock
2175 * beyond end of badblocks
2176 * beyond write-intent bitmap
2178 if (rdev->sb_start + (32+4)*2 > new_offset)
2180 bitmap = rdev->mddev->bitmap;
2181 if (bitmap && !rdev->mddev->bitmap_info.file &&
2182 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2183 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2185 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2191 static struct super_type super_types[] = {
2194 .owner = THIS_MODULE,
2195 .load_super = super_90_load,
2196 .validate_super = super_90_validate,
2197 .sync_super = super_90_sync,
2198 .rdev_size_change = super_90_rdev_size_change,
2199 .allow_new_offset = super_90_allow_new_offset,
2203 .owner = THIS_MODULE,
2204 .load_super = super_1_load,
2205 .validate_super = super_1_validate,
2206 .sync_super = super_1_sync,
2207 .rdev_size_change = super_1_rdev_size_change,
2208 .allow_new_offset = super_1_allow_new_offset,
2212 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2214 if (mddev->sync_super) {
2215 mddev->sync_super(mddev, rdev);
2219 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2221 super_types[mddev->major_version].sync_super(mddev, rdev);
2224 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2226 struct md_rdev *rdev, *rdev2;
2229 rdev_for_each_rcu(rdev, mddev1) {
2230 if (test_bit(Faulty, &rdev->flags) ||
2231 test_bit(Journal, &rdev->flags) ||
2232 rdev->raid_disk == -1)
2234 rdev_for_each_rcu(rdev2, mddev2) {
2235 if (test_bit(Faulty, &rdev2->flags) ||
2236 test_bit(Journal, &rdev2->flags) ||
2237 rdev2->raid_disk == -1)
2239 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2249 static LIST_HEAD(pending_raid_disks);
2252 * Try to register data integrity profile for an mddev
2254 * This is called when an array is started and after a disk has been kicked
2255 * from the array. It only succeeds if all working and active component devices
2256 * are integrity capable with matching profiles.
2258 int md_integrity_register(struct mddev *mddev)
2260 struct md_rdev *rdev, *reference = NULL;
2262 if (list_empty(&mddev->disks))
2263 return 0; /* nothing to do */
2264 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2265 return 0; /* shouldn't register, or already is */
2266 rdev_for_each(rdev, mddev) {
2267 /* skip spares and non-functional disks */
2268 if (test_bit(Faulty, &rdev->flags))
2270 if (rdev->raid_disk < 0)
2273 /* Use the first rdev as the reference */
2277 /* does this rdev's profile match the reference profile? */
2278 if (blk_integrity_compare(reference->bdev->bd_disk,
2279 rdev->bdev->bd_disk) < 0)
2282 if (!reference || !bdev_get_integrity(reference->bdev))
2285 * All component devices are integrity capable and have matching
2286 * profiles, register the common profile for the md device.
2288 blk_integrity_register(mddev->gendisk,
2289 bdev_get_integrity(reference->bdev));
2291 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2292 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2293 (mddev->level != 1 && mddev->level != 10 &&
2294 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2296 * No need to handle the failure of bioset_integrity_create,
2297 * because the function is called by md_run() -> pers->run(),
2298 * md_run calls bioset_exit -> bioset_integrity_free in case
2301 pr_err("md: failed to create integrity pool for %s\n",
2307 EXPORT_SYMBOL(md_integrity_register);
2310 * Attempt to add an rdev, but only if it is consistent with the current
2313 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2315 struct blk_integrity *bi_mddev;
2317 if (!mddev->gendisk)
2320 bi_mddev = blk_get_integrity(mddev->gendisk);
2322 if (!bi_mddev) /* nothing to do */
2325 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2326 pr_err("%s: incompatible integrity profile for %pg\n",
2327 mdname(mddev), rdev->bdev);
2333 EXPORT_SYMBOL(md_integrity_add_rdev);
2335 static bool rdev_read_only(struct md_rdev *rdev)
2337 return bdev_read_only(rdev->bdev) ||
2338 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2341 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2343 char b[BDEVNAME_SIZE];
2346 /* prevent duplicates */
2347 if (find_rdev(mddev, rdev->bdev->bd_dev))
2350 if (rdev_read_only(rdev) && mddev->pers)
2353 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2354 if (!test_bit(Journal, &rdev->flags) &&
2356 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2358 /* Cannot change size, so fail
2359 * If mddev->level <= 0, then we don't care
2360 * about aligning sizes (e.g. linear)
2362 if (mddev->level > 0)
2365 mddev->dev_sectors = rdev->sectors;
2368 /* Verify rdev->desc_nr is unique.
2369 * If it is -1, assign a free number, else
2370 * check number is not in use
2373 if (rdev->desc_nr < 0) {
2376 choice = mddev->raid_disks;
2377 while (md_find_rdev_nr_rcu(mddev, choice))
2379 rdev->desc_nr = choice;
2381 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2387 if (!test_bit(Journal, &rdev->flags) &&
2388 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2389 pr_warn("md: %s: array is limited to %d devices\n",
2390 mdname(mddev), mddev->max_disks);
2393 snprintf(b, sizeof(b), "%pg", rdev->bdev);
2394 strreplace(b, '/', '!');
2396 rdev->mddev = mddev;
2397 pr_debug("md: bind<%s>\n", b);
2399 if (mddev->raid_disks)
2400 mddev_create_serial_pool(mddev, rdev, false);
2402 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2405 /* failure here is OK */
2406 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2407 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2408 rdev->sysfs_unack_badblocks =
2409 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2410 rdev->sysfs_badblocks =
2411 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2413 list_add_rcu(&rdev->same_set, &mddev->disks);
2414 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2416 /* May as well allow recovery to be retried once */
2417 mddev->recovery_disabled++;
2422 pr_warn("md: failed to register dev-%s for %s\n",
2427 static void rdev_delayed_delete(struct work_struct *ws)
2429 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2430 kobject_del(&rdev->kobj);
2431 kobject_put(&rdev->kobj);
2434 void md_autodetect_dev(dev_t dev);
2436 /* just for claiming the bdev */
2437 static struct md_rdev claim_rdev;
2439 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
2441 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2442 md_rdev_clear(rdev);
2444 if (test_bit(AutoDetected, &rdev->flags))
2445 md_autodetect_dev(rdev->bdev->bd_dev);
2447 blkdev_put(rdev->bdev, mddev->major_version == -2 ? &claim_rdev : rdev);
2449 kobject_put(&rdev->kobj);
2452 static void md_kick_rdev_from_array(struct md_rdev *rdev)
2454 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2455 list_del_rcu(&rdev->same_set);
2456 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2457 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2459 sysfs_remove_link(&rdev->kobj, "block");
2460 sysfs_put(rdev->sysfs_state);
2461 sysfs_put(rdev->sysfs_unack_badblocks);
2462 sysfs_put(rdev->sysfs_badblocks);
2463 rdev->sysfs_state = NULL;
2464 rdev->sysfs_unack_badblocks = NULL;
2465 rdev->sysfs_badblocks = NULL;
2466 rdev->badblocks.count = 0;
2467 /* We need to delay this, otherwise we can deadlock when
2468 * writing to 'remove' to "dev/state". We also need
2469 * to delay it due to rcu usage.
2472 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2473 kobject_get(&rdev->kobj);
2474 queue_work(md_rdev_misc_wq, &rdev->del_work);
2475 export_rdev(rdev, rdev->mddev);
2478 static void export_array(struct mddev *mddev)
2480 struct md_rdev *rdev;
2482 while (!list_empty(&mddev->disks)) {
2483 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2485 md_kick_rdev_from_array(rdev);
2487 mddev->raid_disks = 0;
2488 mddev->major_version = 0;
2491 static bool set_in_sync(struct mddev *mddev)
2493 lockdep_assert_held(&mddev->lock);
2494 if (!mddev->in_sync) {
2495 mddev->sync_checkers++;
2496 spin_unlock(&mddev->lock);
2497 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2498 spin_lock(&mddev->lock);
2499 if (!mddev->in_sync &&
2500 percpu_ref_is_zero(&mddev->writes_pending)) {
2503 * Ensure ->in_sync is visible before we clear
2507 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2508 sysfs_notify_dirent_safe(mddev->sysfs_state);
2510 if (--mddev->sync_checkers == 0)
2511 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2513 if (mddev->safemode == 1)
2514 mddev->safemode = 0;
2515 return mddev->in_sync;
2518 static void sync_sbs(struct mddev *mddev, int nospares)
2520 /* Update each superblock (in-memory image), but
2521 * if we are allowed to, skip spares which already
2522 * have the right event counter, or have one earlier
2523 * (which would mean they aren't being marked as dirty
2524 * with the rest of the array)
2526 struct md_rdev *rdev;
2527 rdev_for_each(rdev, mddev) {
2528 if (rdev->sb_events == mddev->events ||
2530 rdev->raid_disk < 0 &&
2531 rdev->sb_events+1 == mddev->events)) {
2532 /* Don't update this superblock */
2533 rdev->sb_loaded = 2;
2535 sync_super(mddev, rdev);
2536 rdev->sb_loaded = 1;
2541 static bool does_sb_need_changing(struct mddev *mddev)
2543 struct md_rdev *rdev = NULL, *iter;
2544 struct mdp_superblock_1 *sb;
2547 /* Find a good rdev */
2548 rdev_for_each(iter, mddev)
2549 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2554 /* No good device found. */
2558 sb = page_address(rdev->sb_page);
2559 /* Check if a device has become faulty or a spare become active */
2560 rdev_for_each(rdev, mddev) {
2561 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2562 /* Device activated? */
2563 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2564 !test_bit(Faulty, &rdev->flags))
2566 /* Device turned faulty? */
2567 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2571 /* Check if any mddev parameters have changed */
2572 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2573 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2574 (mddev->layout != le32_to_cpu(sb->layout)) ||
2575 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2576 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2582 void md_update_sb(struct mddev *mddev, int force_change)
2584 struct md_rdev *rdev;
2587 int any_badblocks_changed = 0;
2590 if (!md_is_rdwr(mddev)) {
2592 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2597 if (mddev_is_clustered(mddev)) {
2598 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2600 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2602 ret = md_cluster_ops->metadata_update_start(mddev);
2603 /* Has someone else has updated the sb */
2604 if (!does_sb_need_changing(mddev)) {
2606 md_cluster_ops->metadata_update_cancel(mddev);
2607 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2608 BIT(MD_SB_CHANGE_DEVS) |
2609 BIT(MD_SB_CHANGE_CLEAN));
2615 * First make sure individual recovery_offsets are correct
2616 * curr_resync_completed can only be used during recovery.
2617 * During reshape/resync it might use array-addresses rather
2618 * that device addresses.
2620 rdev_for_each(rdev, mddev) {
2621 if (rdev->raid_disk >= 0 &&
2622 mddev->delta_disks >= 0 &&
2623 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2624 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2625 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2626 !test_bit(Journal, &rdev->flags) &&
2627 !test_bit(In_sync, &rdev->flags) &&
2628 mddev->curr_resync_completed > rdev->recovery_offset)
2629 rdev->recovery_offset = mddev->curr_resync_completed;
2632 if (!mddev->persistent) {
2633 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2634 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2635 if (!mddev->external) {
2636 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2637 rdev_for_each(rdev, mddev) {
2638 if (rdev->badblocks.changed) {
2639 rdev->badblocks.changed = 0;
2640 ack_all_badblocks(&rdev->badblocks);
2641 md_error(mddev, rdev);
2643 clear_bit(Blocked, &rdev->flags);
2644 clear_bit(BlockedBadBlocks, &rdev->flags);
2645 wake_up(&rdev->blocked_wait);
2648 wake_up(&mddev->sb_wait);
2652 spin_lock(&mddev->lock);
2654 mddev->utime = ktime_get_real_seconds();
2656 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2658 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2659 /* just a clean<-> dirty transition, possibly leave spares alone,
2660 * though if events isn't the right even/odd, we will have to do
2666 if (mddev->degraded)
2667 /* If the array is degraded, then skipping spares is both
2668 * dangerous and fairly pointless.
2669 * Dangerous because a device that was removed from the array
2670 * might have a event_count that still looks up-to-date,
2671 * so it can be re-added without a resync.
2672 * Pointless because if there are any spares to skip,
2673 * then a recovery will happen and soon that array won't
2674 * be degraded any more and the spare can go back to sleep then.
2678 sync_req = mddev->in_sync;
2680 /* If this is just a dirty<->clean transition, and the array is clean
2681 * and 'events' is odd, we can roll back to the previous clean state */
2683 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2684 && mddev->can_decrease_events
2685 && mddev->events != 1) {
2687 mddev->can_decrease_events = 0;
2689 /* otherwise we have to go forward and ... */
2691 mddev->can_decrease_events = nospares;
2695 * This 64-bit counter should never wrap.
2696 * Either we are in around ~1 trillion A.C., assuming
2697 * 1 reboot per second, or we have a bug...
2699 WARN_ON(mddev->events == 0);
2701 rdev_for_each(rdev, mddev) {
2702 if (rdev->badblocks.changed)
2703 any_badblocks_changed++;
2704 if (test_bit(Faulty, &rdev->flags))
2705 set_bit(FaultRecorded, &rdev->flags);
2708 sync_sbs(mddev, nospares);
2709 spin_unlock(&mddev->lock);
2711 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2712 mdname(mddev), mddev->in_sync);
2715 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2717 md_bitmap_update_sb(mddev->bitmap);
2718 rdev_for_each(rdev, mddev) {
2719 if (rdev->sb_loaded != 1)
2720 continue; /* no noise on spare devices */
2722 if (!test_bit(Faulty, &rdev->flags)) {
2723 md_super_write(mddev,rdev,
2724 rdev->sb_start, rdev->sb_size,
2726 pr_debug("md: (write) %pg's sb offset: %llu\n",
2728 (unsigned long long)rdev->sb_start);
2729 rdev->sb_events = mddev->events;
2730 if (rdev->badblocks.size) {
2731 md_super_write(mddev, rdev,
2732 rdev->badblocks.sector,
2733 rdev->badblocks.size << 9,
2735 rdev->badblocks.size = 0;
2739 pr_debug("md: %pg (skipping faulty)\n",
2742 if (mddev->level == LEVEL_MULTIPATH)
2743 /* only need to write one superblock... */
2746 if (md_super_wait(mddev) < 0)
2748 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2750 if (mddev_is_clustered(mddev) && ret == 0)
2751 md_cluster_ops->metadata_update_finish(mddev);
2753 if (mddev->in_sync != sync_req ||
2754 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2755 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2756 /* have to write it out again */
2758 wake_up(&mddev->sb_wait);
2759 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2760 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2762 rdev_for_each(rdev, mddev) {
2763 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2764 clear_bit(Blocked, &rdev->flags);
2766 if (any_badblocks_changed)
2767 ack_all_badblocks(&rdev->badblocks);
2768 clear_bit(BlockedBadBlocks, &rdev->flags);
2769 wake_up(&rdev->blocked_wait);
2772 EXPORT_SYMBOL(md_update_sb);
2774 static int add_bound_rdev(struct md_rdev *rdev)
2776 struct mddev *mddev = rdev->mddev;
2778 bool add_journal = test_bit(Journal, &rdev->flags);
2780 if (!mddev->pers->hot_remove_disk || add_journal) {
2781 /* If there is hot_add_disk but no hot_remove_disk
2782 * then added disks for geometry changes,
2783 * and should be added immediately.
2785 super_types[mddev->major_version].
2786 validate_super(mddev, rdev);
2788 mddev_suspend(mddev);
2789 err = mddev->pers->hot_add_disk(mddev, rdev);
2791 mddev_resume(mddev);
2793 md_kick_rdev_from_array(rdev);
2797 sysfs_notify_dirent_safe(rdev->sysfs_state);
2799 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2800 if (mddev->degraded)
2801 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2802 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2804 md_wakeup_thread(mddev->thread);
2808 /* words written to sysfs files may, or may not, be \n terminated.
2809 * We want to accept with case. For this we use cmd_match.
2811 static int cmd_match(const char *cmd, const char *str)
2813 /* See if cmd, written into a sysfs file, matches
2814 * str. They must either be the same, or cmd can
2815 * have a trailing newline
2817 while (*cmd && *str && *cmd == *str) {
2828 struct rdev_sysfs_entry {
2829 struct attribute attr;
2830 ssize_t (*show)(struct md_rdev *, char *);
2831 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2835 state_show(struct md_rdev *rdev, char *page)
2839 unsigned long flags = READ_ONCE(rdev->flags);
2841 if (test_bit(Faulty, &flags) ||
2842 (!test_bit(ExternalBbl, &flags) &&
2843 rdev->badblocks.unacked_exist))
2844 len += sprintf(page+len, "faulty%s", sep);
2845 if (test_bit(In_sync, &flags))
2846 len += sprintf(page+len, "in_sync%s", sep);
2847 if (test_bit(Journal, &flags))
2848 len += sprintf(page+len, "journal%s", sep);
2849 if (test_bit(WriteMostly, &flags))
2850 len += sprintf(page+len, "write_mostly%s", sep);
2851 if (test_bit(Blocked, &flags) ||
2852 (rdev->badblocks.unacked_exist
2853 && !test_bit(Faulty, &flags)))
2854 len += sprintf(page+len, "blocked%s", sep);
2855 if (!test_bit(Faulty, &flags) &&
2856 !test_bit(Journal, &flags) &&
2857 !test_bit(In_sync, &flags))
2858 len += sprintf(page+len, "spare%s", sep);
2859 if (test_bit(WriteErrorSeen, &flags))
2860 len += sprintf(page+len, "write_error%s", sep);
2861 if (test_bit(WantReplacement, &flags))
2862 len += sprintf(page+len, "want_replacement%s", sep);
2863 if (test_bit(Replacement, &flags))
2864 len += sprintf(page+len, "replacement%s", sep);
2865 if (test_bit(ExternalBbl, &flags))
2866 len += sprintf(page+len, "external_bbl%s", sep);
2867 if (test_bit(FailFast, &flags))
2868 len += sprintf(page+len, "failfast%s", sep);
2873 return len+sprintf(page+len, "\n");
2877 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2880 * faulty - simulates an error
2881 * remove - disconnects the device
2882 * writemostly - sets write_mostly
2883 * -writemostly - clears write_mostly
2884 * blocked - sets the Blocked flags
2885 * -blocked - clears the Blocked and possibly simulates an error
2886 * insync - sets Insync providing device isn't active
2887 * -insync - clear Insync for a device with a slot assigned,
2888 * so that it gets rebuilt based on bitmap
2889 * write_error - sets WriteErrorSeen
2890 * -write_error - clears WriteErrorSeen
2891 * {,-}failfast - set/clear FailFast
2894 struct mddev *mddev = rdev->mddev;
2896 bool need_update_sb = false;
2898 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2899 md_error(rdev->mddev, rdev);
2901 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
2905 } else if (cmd_match(buf, "remove")) {
2906 if (rdev->mddev->pers) {
2907 clear_bit(Blocked, &rdev->flags);
2908 remove_and_add_spares(rdev->mddev, rdev);
2910 if (rdev->raid_disk >= 0)
2914 if (mddev_is_clustered(mddev))
2915 err = md_cluster_ops->remove_disk(mddev, rdev);
2918 md_kick_rdev_from_array(rdev);
2920 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2921 md_wakeup_thread(mddev->thread);
2926 } else if (cmd_match(buf, "writemostly")) {
2927 set_bit(WriteMostly, &rdev->flags);
2928 mddev_create_serial_pool(rdev->mddev, rdev, false);
2929 need_update_sb = true;
2931 } else if (cmd_match(buf, "-writemostly")) {
2932 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2933 clear_bit(WriteMostly, &rdev->flags);
2934 need_update_sb = true;
2936 } else if (cmd_match(buf, "blocked")) {
2937 set_bit(Blocked, &rdev->flags);
2939 } else if (cmd_match(buf, "-blocked")) {
2940 if (!test_bit(Faulty, &rdev->flags) &&
2941 !test_bit(ExternalBbl, &rdev->flags) &&
2942 rdev->badblocks.unacked_exist) {
2943 /* metadata handler doesn't understand badblocks,
2944 * so we need to fail the device
2946 md_error(rdev->mddev, rdev);
2948 clear_bit(Blocked, &rdev->flags);
2949 clear_bit(BlockedBadBlocks, &rdev->flags);
2950 wake_up(&rdev->blocked_wait);
2951 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2952 md_wakeup_thread(rdev->mddev->thread);
2955 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2956 set_bit(In_sync, &rdev->flags);
2958 } else if (cmd_match(buf, "failfast")) {
2959 set_bit(FailFast, &rdev->flags);
2960 need_update_sb = true;
2962 } else if (cmd_match(buf, "-failfast")) {
2963 clear_bit(FailFast, &rdev->flags);
2964 need_update_sb = true;
2966 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2967 !test_bit(Journal, &rdev->flags)) {
2968 if (rdev->mddev->pers == NULL) {
2969 clear_bit(In_sync, &rdev->flags);
2970 rdev->saved_raid_disk = rdev->raid_disk;
2971 rdev->raid_disk = -1;
2974 } else if (cmd_match(buf, "write_error")) {
2975 set_bit(WriteErrorSeen, &rdev->flags);
2977 } else if (cmd_match(buf, "-write_error")) {
2978 clear_bit(WriteErrorSeen, &rdev->flags);
2980 } else if (cmd_match(buf, "want_replacement")) {
2981 /* Any non-spare device that is not a replacement can
2982 * become want_replacement at any time, but we then need to
2983 * check if recovery is needed.
2985 if (rdev->raid_disk >= 0 &&
2986 !test_bit(Journal, &rdev->flags) &&
2987 !test_bit(Replacement, &rdev->flags))
2988 set_bit(WantReplacement, &rdev->flags);
2989 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2990 md_wakeup_thread(rdev->mddev->thread);
2992 } else if (cmd_match(buf, "-want_replacement")) {
2993 /* Clearing 'want_replacement' is always allowed.
2994 * Once replacements starts it is too late though.
2997 clear_bit(WantReplacement, &rdev->flags);
2998 } else if (cmd_match(buf, "replacement")) {
2999 /* Can only set a device as a replacement when array has not
3000 * yet been started. Once running, replacement is automatic
3001 * from spares, or by assigning 'slot'.
3003 if (rdev->mddev->pers)
3006 set_bit(Replacement, &rdev->flags);
3009 } else if (cmd_match(buf, "-replacement")) {
3010 /* Similarly, can only clear Replacement before start */
3011 if (rdev->mddev->pers)
3014 clear_bit(Replacement, &rdev->flags);
3017 } else if (cmd_match(buf, "re-add")) {
3018 if (!rdev->mddev->pers)
3020 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3021 rdev->saved_raid_disk >= 0) {
3022 /* clear_bit is performed _after_ all the devices
3023 * have their local Faulty bit cleared. If any writes
3024 * happen in the meantime in the local node, they
3025 * will land in the local bitmap, which will be synced
3026 * by this node eventually
3028 if (!mddev_is_clustered(rdev->mddev) ||
3029 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3030 clear_bit(Faulty, &rdev->flags);
3031 err = add_bound_rdev(rdev);
3035 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3036 set_bit(ExternalBbl, &rdev->flags);
3037 rdev->badblocks.shift = 0;
3039 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3040 clear_bit(ExternalBbl, &rdev->flags);
3044 md_update_sb(mddev, 1);
3046 sysfs_notify_dirent_safe(rdev->sysfs_state);
3047 return err ? err : len;
3049 static struct rdev_sysfs_entry rdev_state =
3050 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3053 errors_show(struct md_rdev *rdev, char *page)
3055 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3059 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3064 rv = kstrtouint(buf, 10, &n);
3067 atomic_set(&rdev->corrected_errors, n);
3070 static struct rdev_sysfs_entry rdev_errors =
3071 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3074 slot_show(struct md_rdev *rdev, char *page)
3076 if (test_bit(Journal, &rdev->flags))
3077 return sprintf(page, "journal\n");
3078 else if (rdev->raid_disk < 0)
3079 return sprintf(page, "none\n");
3081 return sprintf(page, "%d\n", rdev->raid_disk);
3085 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3090 if (test_bit(Journal, &rdev->flags))
3092 if (strncmp(buf, "none", 4)==0)
3095 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3102 if (rdev->mddev->pers && slot == -1) {
3103 /* Setting 'slot' on an active array requires also
3104 * updating the 'rd%d' link, and communicating
3105 * with the personality with ->hot_*_disk.
3106 * For now we only support removing
3107 * failed/spare devices. This normally happens automatically,
3108 * but not when the metadata is externally managed.
3110 if (rdev->raid_disk == -1)
3112 /* personality does all needed checks */
3113 if (rdev->mddev->pers->hot_remove_disk == NULL)
3115 clear_bit(Blocked, &rdev->flags);
3116 remove_and_add_spares(rdev->mddev, rdev);
3117 if (rdev->raid_disk >= 0)
3119 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3120 md_wakeup_thread(rdev->mddev->thread);
3121 } else if (rdev->mddev->pers) {
3122 /* Activating a spare .. or possibly reactivating
3123 * if we ever get bitmaps working here.
3127 if (rdev->raid_disk != -1)
3130 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3133 if (rdev->mddev->pers->hot_add_disk == NULL)
3136 if (slot >= rdev->mddev->raid_disks &&
3137 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3140 rdev->raid_disk = slot;
3141 if (test_bit(In_sync, &rdev->flags))
3142 rdev->saved_raid_disk = slot;
3144 rdev->saved_raid_disk = -1;
3145 clear_bit(In_sync, &rdev->flags);
3146 clear_bit(Bitmap_sync, &rdev->flags);
3147 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3149 rdev->raid_disk = -1;
3152 sysfs_notify_dirent_safe(rdev->sysfs_state);
3153 /* failure here is OK */;
3154 sysfs_link_rdev(rdev->mddev, rdev);
3155 /* don't wakeup anyone, leave that to userspace. */
3157 if (slot >= rdev->mddev->raid_disks &&
3158 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3160 rdev->raid_disk = slot;
3161 /* assume it is working */
3162 clear_bit(Faulty, &rdev->flags);
3163 clear_bit(WriteMostly, &rdev->flags);
3164 set_bit(In_sync, &rdev->flags);
3165 sysfs_notify_dirent_safe(rdev->sysfs_state);
3170 static struct rdev_sysfs_entry rdev_slot =
3171 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3174 offset_show(struct md_rdev *rdev, char *page)
3176 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3180 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3182 unsigned long long offset;
3183 if (kstrtoull(buf, 10, &offset) < 0)
3185 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3187 if (rdev->sectors && rdev->mddev->external)
3188 /* Must set offset before size, so overlap checks
3191 rdev->data_offset = offset;
3192 rdev->new_data_offset = offset;
3196 static struct rdev_sysfs_entry rdev_offset =
3197 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3199 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3201 return sprintf(page, "%llu\n",
3202 (unsigned long long)rdev->new_data_offset);
3205 static ssize_t new_offset_store(struct md_rdev *rdev,
3206 const char *buf, size_t len)
3208 unsigned long long new_offset;
3209 struct mddev *mddev = rdev->mddev;
3211 if (kstrtoull(buf, 10, &new_offset) < 0)
3214 if (mddev->sync_thread ||
3215 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3217 if (new_offset == rdev->data_offset)
3218 /* reset is always permitted */
3220 else if (new_offset > rdev->data_offset) {
3221 /* must not push array size beyond rdev_sectors */
3222 if (new_offset - rdev->data_offset
3223 + mddev->dev_sectors > rdev->sectors)
3226 /* Metadata worries about other space details. */
3228 /* decreasing the offset is inconsistent with a backwards
3231 if (new_offset < rdev->data_offset &&
3232 mddev->reshape_backwards)
3234 /* Increasing offset is inconsistent with forwards
3235 * reshape. reshape_direction should be set to
3236 * 'backwards' first.
3238 if (new_offset > rdev->data_offset &&
3239 !mddev->reshape_backwards)
3242 if (mddev->pers && mddev->persistent &&
3243 !super_types[mddev->major_version]
3244 .allow_new_offset(rdev, new_offset))
3246 rdev->new_data_offset = new_offset;
3247 if (new_offset > rdev->data_offset)
3248 mddev->reshape_backwards = 1;
3249 else if (new_offset < rdev->data_offset)
3250 mddev->reshape_backwards = 0;
3254 static struct rdev_sysfs_entry rdev_new_offset =
3255 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3258 rdev_size_show(struct md_rdev *rdev, char *page)
3260 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3263 static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
3265 /* check if two start/length pairs overlap */
3266 if (a->data_offset + a->sectors <= b->data_offset)
3268 if (b->data_offset + b->sectors <= a->data_offset)
3273 static bool md_rdev_overlaps(struct md_rdev *rdev)
3275 struct mddev *mddev;
3276 struct md_rdev *rdev2;
3278 spin_lock(&all_mddevs_lock);
3279 list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
3280 if (test_bit(MD_DELETED, &mddev->flags))
3282 rdev_for_each(rdev2, mddev) {
3283 if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
3284 md_rdevs_overlap(rdev, rdev2)) {
3285 spin_unlock(&all_mddevs_lock);
3290 spin_unlock(&all_mddevs_lock);
3294 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3296 unsigned long long blocks;
3299 if (kstrtoull(buf, 10, &blocks) < 0)
3302 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3303 return -EINVAL; /* sector conversion overflow */
3306 if (new != blocks * 2)
3307 return -EINVAL; /* unsigned long long to sector_t overflow */
3314 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3316 struct mddev *my_mddev = rdev->mddev;
3317 sector_t oldsectors = rdev->sectors;
3320 if (test_bit(Journal, &rdev->flags))
3322 if (strict_blocks_to_sectors(buf, §ors) < 0)
3324 if (rdev->data_offset != rdev->new_data_offset)
3325 return -EINVAL; /* too confusing */
3326 if (my_mddev->pers && rdev->raid_disk >= 0) {
3327 if (my_mddev->persistent) {
3328 sectors = super_types[my_mddev->major_version].
3329 rdev_size_change(rdev, sectors);
3332 } else if (!sectors)
3333 sectors = bdev_nr_sectors(rdev->bdev) -
3335 if (!my_mddev->pers->resize)
3336 /* Cannot change size for RAID0 or Linear etc */
3339 if (sectors < my_mddev->dev_sectors)
3340 return -EINVAL; /* component must fit device */
3342 rdev->sectors = sectors;
3345 * Check that all other rdevs with the same bdev do not overlap. This
3346 * check does not provide a hard guarantee, it just helps avoid
3347 * dangerous mistakes.
3349 if (sectors > oldsectors && my_mddev->external &&
3350 md_rdev_overlaps(rdev)) {
3352 * Someone else could have slipped in a size change here, but
3353 * doing so is just silly. We put oldsectors back because we
3354 * know it is safe, and trust userspace not to race with itself.
3356 rdev->sectors = oldsectors;
3362 static struct rdev_sysfs_entry rdev_size =
3363 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3365 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3367 unsigned long long recovery_start = rdev->recovery_offset;
3369 if (test_bit(In_sync, &rdev->flags) ||
3370 recovery_start == MaxSector)
3371 return sprintf(page, "none\n");
3373 return sprintf(page, "%llu\n", recovery_start);
3376 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3378 unsigned long long recovery_start;
3380 if (cmd_match(buf, "none"))
3381 recovery_start = MaxSector;
3382 else if (kstrtoull(buf, 10, &recovery_start))
3385 if (rdev->mddev->pers &&
3386 rdev->raid_disk >= 0)
3389 rdev->recovery_offset = recovery_start;
3390 if (recovery_start == MaxSector)
3391 set_bit(In_sync, &rdev->flags);
3393 clear_bit(In_sync, &rdev->flags);
3397 static struct rdev_sysfs_entry rdev_recovery_start =
3398 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3400 /* sysfs access to bad-blocks list.
3401 * We present two files.
3402 * 'bad-blocks' lists sector numbers and lengths of ranges that
3403 * are recorded as bad. The list is truncated to fit within
3404 * the one-page limit of sysfs.
3405 * Writing "sector length" to this file adds an acknowledged
3407 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3408 * been acknowledged. Writing to this file adds bad blocks
3409 * without acknowledging them. This is largely for testing.
3411 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3413 return badblocks_show(&rdev->badblocks, page, 0);
3415 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3417 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3418 /* Maybe that ack was all we needed */
3419 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3420 wake_up(&rdev->blocked_wait);
3423 static struct rdev_sysfs_entry rdev_bad_blocks =
3424 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3426 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3428 return badblocks_show(&rdev->badblocks, page, 1);
3430 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3432 return badblocks_store(&rdev->badblocks, page, len, 1);
3434 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3435 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3438 ppl_sector_show(struct md_rdev *rdev, char *page)
3440 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3444 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3446 unsigned long long sector;
3448 if (kstrtoull(buf, 10, §or) < 0)
3450 if (sector != (sector_t)sector)
3453 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3454 rdev->raid_disk >= 0)
3457 if (rdev->mddev->persistent) {
3458 if (rdev->mddev->major_version == 0)
3460 if ((sector > rdev->sb_start &&
3461 sector - rdev->sb_start > S16_MAX) ||
3462 (sector < rdev->sb_start &&
3463 rdev->sb_start - sector > -S16_MIN))
3465 rdev->ppl.offset = sector - rdev->sb_start;
3466 } else if (!rdev->mddev->external) {
3469 rdev->ppl.sector = sector;
3473 static struct rdev_sysfs_entry rdev_ppl_sector =
3474 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3477 ppl_size_show(struct md_rdev *rdev, char *page)
3479 return sprintf(page, "%u\n", rdev->ppl.size);
3483 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3487 if (kstrtouint(buf, 10, &size) < 0)
3490 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3491 rdev->raid_disk >= 0)
3494 if (rdev->mddev->persistent) {
3495 if (rdev->mddev->major_version == 0)
3499 } else if (!rdev->mddev->external) {
3502 rdev->ppl.size = size;
3506 static struct rdev_sysfs_entry rdev_ppl_size =
3507 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3509 static struct attribute *rdev_default_attrs[] = {
3514 &rdev_new_offset.attr,
3516 &rdev_recovery_start.attr,
3517 &rdev_bad_blocks.attr,
3518 &rdev_unack_bad_blocks.attr,
3519 &rdev_ppl_sector.attr,
3520 &rdev_ppl_size.attr,
3523 ATTRIBUTE_GROUPS(rdev_default);
3525 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3527 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3528 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3534 return entry->show(rdev, page);
3538 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3539 const char *page, size_t length)
3541 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3542 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3544 struct mddev *mddev = rdev->mddev;
3548 if (!capable(CAP_SYS_ADMIN))
3550 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3552 if (rdev->mddev == NULL)
3555 rv = entry->store(rdev, page, length);
3556 mddev_unlock(mddev);
3561 static void rdev_free(struct kobject *ko)
3563 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3566 static const struct sysfs_ops rdev_sysfs_ops = {
3567 .show = rdev_attr_show,
3568 .store = rdev_attr_store,
3570 static const struct kobj_type rdev_ktype = {
3571 .release = rdev_free,
3572 .sysfs_ops = &rdev_sysfs_ops,
3573 .default_groups = rdev_default_groups,
3576 int md_rdev_init(struct md_rdev *rdev)
3579 rdev->saved_raid_disk = -1;
3580 rdev->raid_disk = -1;
3582 rdev->data_offset = 0;
3583 rdev->new_data_offset = 0;
3584 rdev->sb_events = 0;
3585 rdev->last_read_error = 0;
3586 rdev->sb_loaded = 0;
3587 rdev->bb_page = NULL;
3588 atomic_set(&rdev->nr_pending, 0);
3589 atomic_set(&rdev->read_errors, 0);
3590 atomic_set(&rdev->corrected_errors, 0);
3592 INIT_LIST_HEAD(&rdev->same_set);
3593 init_waitqueue_head(&rdev->blocked_wait);
3595 /* Add space to store bad block list.
3596 * This reserves the space even on arrays where it cannot
3597 * be used - I wonder if that matters
3599 return badblocks_init(&rdev->badblocks, 0);
3601 EXPORT_SYMBOL_GPL(md_rdev_init);
3604 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3606 * mark the device faulty if:
3608 * - the device is nonexistent (zero size)
3609 * - the device has no valid superblock
3611 * a faulty rdev _never_ has rdev->sb set.
3613 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3615 struct md_rdev *rdev;
3619 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3621 return ERR_PTR(-ENOMEM);
3623 err = md_rdev_init(rdev);
3626 err = alloc_disk_sb(rdev);
3628 goto out_clear_rdev;
3630 rdev->bdev = blkdev_get_by_dev(newdev, BLK_OPEN_READ | BLK_OPEN_WRITE,
3631 super_format == -2 ? &claim_rdev : rdev, NULL);
3632 if (IS_ERR(rdev->bdev)) {
3633 pr_warn("md: could not open device unknown-block(%u,%u).\n",
3634 MAJOR(newdev), MINOR(newdev));
3635 err = PTR_ERR(rdev->bdev);
3636 goto out_clear_rdev;
3639 kobject_init(&rdev->kobj, &rdev_ktype);
3641 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3643 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3646 goto out_blkdev_put;
3649 if (super_format >= 0) {
3650 err = super_types[super_format].
3651 load_super(rdev, NULL, super_minor);
3652 if (err == -EINVAL) {
3653 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3655 super_format, super_minor);
3656 goto out_blkdev_put;
3659 pr_warn("md: could not read %pg's sb, not importing!\n",
3661 goto out_blkdev_put;
3668 blkdev_put(rdev->bdev, super_format == -2 ? &claim_rdev : rdev);
3670 md_rdev_clear(rdev);
3673 return ERR_PTR(err);
3677 * Check a full RAID array for plausibility
3680 static int analyze_sbs(struct mddev *mddev)
3683 struct md_rdev *rdev, *freshest, *tmp;
3686 rdev_for_each_safe(rdev, tmp, mddev)
3687 switch (super_types[mddev->major_version].
3688 load_super(rdev, freshest, mddev->minor_version)) {
3695 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3697 md_kick_rdev_from_array(rdev);
3700 /* Cannot find a valid fresh disk */
3702 pr_warn("md: cannot find a valid disk\n");
3706 super_types[mddev->major_version].
3707 validate_super(mddev, freshest);
3710 rdev_for_each_safe(rdev, tmp, mddev) {
3711 if (mddev->max_disks &&
3712 (rdev->desc_nr >= mddev->max_disks ||
3713 i > mddev->max_disks)) {
3714 pr_warn("md: %s: %pg: only %d devices permitted\n",
3715 mdname(mddev), rdev->bdev,
3717 md_kick_rdev_from_array(rdev);
3720 if (rdev != freshest) {
3721 if (super_types[mddev->major_version].
3722 validate_super(mddev, rdev)) {
3723 pr_warn("md: kicking non-fresh %pg from array!\n",
3725 md_kick_rdev_from_array(rdev);
3729 if (mddev->level == LEVEL_MULTIPATH) {
3730 rdev->desc_nr = i++;
3731 rdev->raid_disk = rdev->desc_nr;
3732 set_bit(In_sync, &rdev->flags);
3733 } else if (rdev->raid_disk >=
3734 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3735 !test_bit(Journal, &rdev->flags)) {
3736 rdev->raid_disk = -1;
3737 clear_bit(In_sync, &rdev->flags);
3744 /* Read a fixed-point number.
3745 * Numbers in sysfs attributes should be in "standard" units where
3746 * possible, so time should be in seconds.
3747 * However we internally use a a much smaller unit such as
3748 * milliseconds or jiffies.
3749 * This function takes a decimal number with a possible fractional
3750 * component, and produces an integer which is the result of
3751 * multiplying that number by 10^'scale'.
3752 * all without any floating-point arithmetic.
3754 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3756 unsigned long result = 0;
3758 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3761 else if (decimals < scale) {
3764 result = result * 10 + value;
3776 *res = result * int_pow(10, scale - decimals);
3781 safe_delay_show(struct mddev *mddev, char *page)
3783 int msec = (mddev->safemode_delay*1000)/HZ;
3784 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3787 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3791 if (mddev_is_clustered(mddev)) {
3792 pr_warn("md: Safemode is disabled for clustered mode\n");
3796 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3799 mddev->safemode_delay = 0;
3801 unsigned long old_delay = mddev->safemode_delay;
3802 unsigned long new_delay = (msec*HZ)/1000;
3806 mddev->safemode_delay = new_delay;
3807 if (new_delay < old_delay || old_delay == 0)
3808 mod_timer(&mddev->safemode_timer, jiffies+1);
3812 static struct md_sysfs_entry md_safe_delay =
3813 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3816 level_show(struct mddev *mddev, char *page)
3818 struct md_personality *p;
3820 spin_lock(&mddev->lock);
3823 ret = sprintf(page, "%s\n", p->name);
3824 else if (mddev->clevel[0])
3825 ret = sprintf(page, "%s\n", mddev->clevel);
3826 else if (mddev->level != LEVEL_NONE)
3827 ret = sprintf(page, "%d\n", mddev->level);
3830 spin_unlock(&mddev->lock);
3835 level_store(struct mddev *mddev, const char *buf, size_t len)
3840 struct md_personality *pers, *oldpers;
3842 void *priv, *oldpriv;
3843 struct md_rdev *rdev;
3845 if (slen == 0 || slen >= sizeof(clevel))
3848 rv = mddev_lock(mddev);
3852 if (mddev->pers == NULL) {
3853 strncpy(mddev->clevel, buf, slen);
3854 if (mddev->clevel[slen-1] == '\n')
3856 mddev->clevel[slen] = 0;
3857 mddev->level = LEVEL_NONE;
3862 if (!md_is_rdwr(mddev))
3865 /* request to change the personality. Need to ensure:
3866 * - array is not engaged in resync/recovery/reshape
3867 * - old personality can be suspended
3868 * - new personality will access other array.
3872 if (mddev->sync_thread ||
3873 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3874 mddev->reshape_position != MaxSector ||
3875 mddev->sysfs_active)
3879 if (!mddev->pers->quiesce) {
3880 pr_warn("md: %s: %s does not support online personality change\n",
3881 mdname(mddev), mddev->pers->name);
3885 /* Now find the new personality */
3886 strncpy(clevel, buf, slen);
3887 if (clevel[slen-1] == '\n')
3890 if (kstrtol(clevel, 10, &level))
3893 if (request_module("md-%s", clevel) != 0)
3894 request_module("md-level-%s", clevel);
3895 spin_lock(&pers_lock);
3896 pers = find_pers(level, clevel);
3897 if (!pers || !try_module_get(pers->owner)) {
3898 spin_unlock(&pers_lock);
3899 pr_warn("md: personality %s not loaded\n", clevel);
3903 spin_unlock(&pers_lock);
3905 if (pers == mddev->pers) {
3906 /* Nothing to do! */
3907 module_put(pers->owner);
3911 if (!pers->takeover) {
3912 module_put(pers->owner);
3913 pr_warn("md: %s: %s does not support personality takeover\n",
3914 mdname(mddev), clevel);
3919 rdev_for_each(rdev, mddev)
3920 rdev->new_raid_disk = rdev->raid_disk;
3922 /* ->takeover must set new_* and/or delta_disks
3923 * if it succeeds, and may set them when it fails.
3925 priv = pers->takeover(mddev);
3927 mddev->new_level = mddev->level;
3928 mddev->new_layout = mddev->layout;
3929 mddev->new_chunk_sectors = mddev->chunk_sectors;
3930 mddev->raid_disks -= mddev->delta_disks;
3931 mddev->delta_disks = 0;
3932 mddev->reshape_backwards = 0;
3933 module_put(pers->owner);
3934 pr_warn("md: %s: %s would not accept array\n",
3935 mdname(mddev), clevel);
3940 /* Looks like we have a winner */
3941 mddev_suspend(mddev);
3942 mddev_detach(mddev);
3944 spin_lock(&mddev->lock);
3945 oldpers = mddev->pers;
3946 oldpriv = mddev->private;
3948 mddev->private = priv;
3949 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3950 mddev->level = mddev->new_level;
3951 mddev->layout = mddev->new_layout;
3952 mddev->chunk_sectors = mddev->new_chunk_sectors;
3953 mddev->delta_disks = 0;
3954 mddev->reshape_backwards = 0;
3955 mddev->degraded = 0;
3956 spin_unlock(&mddev->lock);
3958 if (oldpers->sync_request == NULL &&
3960 /* We are converting from a no-redundancy array
3961 * to a redundancy array and metadata is managed
3962 * externally so we need to be sure that writes
3963 * won't block due to a need to transition
3965 * until external management is started.
3968 mddev->safemode_delay = 0;
3969 mddev->safemode = 0;
3972 oldpers->free(mddev, oldpriv);
3974 if (oldpers->sync_request == NULL &&
3975 pers->sync_request != NULL) {
3976 /* need to add the md_redundancy_group */
3977 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3978 pr_warn("md: cannot register extra attributes for %s\n",
3980 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3981 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
3982 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
3984 if (oldpers->sync_request != NULL &&
3985 pers->sync_request == NULL) {
3986 /* need to remove the md_redundancy_group */
3987 if (mddev->to_remove == NULL)
3988 mddev->to_remove = &md_redundancy_group;
3991 module_put(oldpers->owner);
3993 rdev_for_each(rdev, mddev) {
3994 if (rdev->raid_disk < 0)
3996 if (rdev->new_raid_disk >= mddev->raid_disks)
3997 rdev->new_raid_disk = -1;
3998 if (rdev->new_raid_disk == rdev->raid_disk)
4000 sysfs_unlink_rdev(mddev, rdev);
4002 rdev_for_each(rdev, mddev) {
4003 if (rdev->raid_disk < 0)
4005 if (rdev->new_raid_disk == rdev->raid_disk)
4007 rdev->raid_disk = rdev->new_raid_disk;
4008 if (rdev->raid_disk < 0)
4009 clear_bit(In_sync, &rdev->flags);
4011 if (sysfs_link_rdev(mddev, rdev))
4012 pr_warn("md: cannot register rd%d for %s after level change\n",
4013 rdev->raid_disk, mdname(mddev));
4017 if (pers->sync_request == NULL) {
4018 /* this is now an array without redundancy, so
4019 * it must always be in_sync
4022 del_timer_sync(&mddev->safemode_timer);
4024 blk_set_stacking_limits(&mddev->queue->limits);
4026 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4027 mddev_resume(mddev);
4029 md_update_sb(mddev, 1);
4030 sysfs_notify_dirent_safe(mddev->sysfs_level);
4034 mddev_unlock(mddev);
4038 static struct md_sysfs_entry md_level =
4039 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4042 layout_show(struct mddev *mddev, char *page)
4044 /* just a number, not meaningful for all levels */
4045 if (mddev->reshape_position != MaxSector &&
4046 mddev->layout != mddev->new_layout)
4047 return sprintf(page, "%d (%d)\n",
4048 mddev->new_layout, mddev->layout);
4049 return sprintf(page, "%d\n", mddev->layout);
4053 layout_store(struct mddev *mddev, const char *buf, size_t len)
4058 err = kstrtouint(buf, 10, &n);
4061 err = mddev_lock(mddev);
4066 if (mddev->pers->check_reshape == NULL)
4068 else if (!md_is_rdwr(mddev))
4071 mddev->new_layout = n;
4072 err = mddev->pers->check_reshape(mddev);
4074 mddev->new_layout = mddev->layout;
4077 mddev->new_layout = n;
4078 if (mddev->reshape_position == MaxSector)
4081 mddev_unlock(mddev);
4084 static struct md_sysfs_entry md_layout =
4085 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4088 raid_disks_show(struct mddev *mddev, char *page)
4090 if (mddev->raid_disks == 0)
4092 if (mddev->reshape_position != MaxSector &&
4093 mddev->delta_disks != 0)
4094 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4095 mddev->raid_disks - mddev->delta_disks);
4096 return sprintf(page, "%d\n", mddev->raid_disks);
4099 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4102 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4107 err = kstrtouint(buf, 10, &n);
4111 err = mddev_lock(mddev);
4115 err = update_raid_disks(mddev, n);
4116 else if (mddev->reshape_position != MaxSector) {
4117 struct md_rdev *rdev;
4118 int olddisks = mddev->raid_disks - mddev->delta_disks;
4121 rdev_for_each(rdev, mddev) {
4123 rdev->data_offset < rdev->new_data_offset)
4126 rdev->data_offset > rdev->new_data_offset)
4130 mddev->delta_disks = n - olddisks;
4131 mddev->raid_disks = n;
4132 mddev->reshape_backwards = (mddev->delta_disks < 0);
4134 mddev->raid_disks = n;
4136 mddev_unlock(mddev);
4137 return err ? err : len;
4139 static struct md_sysfs_entry md_raid_disks =
4140 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4143 uuid_show(struct mddev *mddev, char *page)
4145 return sprintf(page, "%pU\n", mddev->uuid);
4147 static struct md_sysfs_entry md_uuid =
4148 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4151 chunk_size_show(struct mddev *mddev, char *page)
4153 if (mddev->reshape_position != MaxSector &&
4154 mddev->chunk_sectors != mddev->new_chunk_sectors)
4155 return sprintf(page, "%d (%d)\n",
4156 mddev->new_chunk_sectors << 9,
4157 mddev->chunk_sectors << 9);
4158 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4162 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4167 err = kstrtoul(buf, 10, &n);
4171 err = mddev_lock(mddev);
4175 if (mddev->pers->check_reshape == NULL)
4177 else if (!md_is_rdwr(mddev))
4180 mddev->new_chunk_sectors = n >> 9;
4181 err = mddev->pers->check_reshape(mddev);
4183 mddev->new_chunk_sectors = mddev->chunk_sectors;
4186 mddev->new_chunk_sectors = n >> 9;
4187 if (mddev->reshape_position == MaxSector)
4188 mddev->chunk_sectors = n >> 9;
4190 mddev_unlock(mddev);
4193 static struct md_sysfs_entry md_chunk_size =
4194 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4197 resync_start_show(struct mddev *mddev, char *page)
4199 if (mddev->recovery_cp == MaxSector)
4200 return sprintf(page, "none\n");
4201 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4205 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4207 unsigned long long n;
4210 if (cmd_match(buf, "none"))
4213 err = kstrtoull(buf, 10, &n);
4216 if (n != (sector_t)n)
4220 err = mddev_lock(mddev);
4223 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4227 mddev->recovery_cp = n;
4229 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4231 mddev_unlock(mddev);
4234 static struct md_sysfs_entry md_resync_start =
4235 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4236 resync_start_show, resync_start_store);
4239 * The array state can be:
4242 * No devices, no size, no level
4243 * Equivalent to STOP_ARRAY ioctl
4245 * May have some settings, but array is not active
4246 * all IO results in error
4247 * When written, doesn't tear down array, but just stops it
4248 * suspended (not supported yet)
4249 * All IO requests will block. The array can be reconfigured.
4250 * Writing this, if accepted, will block until array is quiescent
4252 * no resync can happen. no superblocks get written.
4253 * write requests fail
4255 * like readonly, but behaves like 'clean' on a write request.
4257 * clean - no pending writes, but otherwise active.
4258 * When written to inactive array, starts without resync
4259 * If a write request arrives then
4260 * if metadata is known, mark 'dirty' and switch to 'active'.
4261 * if not known, block and switch to write-pending
4262 * If written to an active array that has pending writes, then fails.
4264 * fully active: IO and resync can be happening.
4265 * When written to inactive array, starts with resync
4268 * clean, but writes are blocked waiting for 'active' to be written.
4271 * like active, but no writes have been seen for a while (100msec).
4274 * Array is failed. It's useful because mounted-arrays aren't stopped
4275 * when array is failed, so this state will at least alert the user that
4276 * something is wrong.
4278 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4279 write_pending, active_idle, broken, bad_word};
4280 static char *array_states[] = {
4281 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4282 "write-pending", "active-idle", "broken", NULL };
4284 static int match_word(const char *word, char **list)
4287 for (n=0; list[n]; n++)
4288 if (cmd_match(word, list[n]))
4294 array_state_show(struct mddev *mddev, char *page)
4296 enum array_state st = inactive;
4298 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4307 spin_lock(&mddev->lock);
4308 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4310 else if (mddev->in_sync)
4312 else if (mddev->safemode)
4316 spin_unlock(&mddev->lock);
4319 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4322 if (list_empty(&mddev->disks) &&
4323 mddev->raid_disks == 0 &&
4324 mddev->dev_sectors == 0)
4329 return sprintf(page, "%s\n", array_states[st]);
4332 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4333 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4334 static int restart_array(struct mddev *mddev);
4337 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4340 enum array_state st = match_word(buf, array_states);
4342 if (mddev->pers && (st == active || st == clean) &&
4343 mddev->ro != MD_RDONLY) {
4344 /* don't take reconfig_mutex when toggling between
4347 spin_lock(&mddev->lock);
4349 restart_array(mddev);
4350 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4351 md_wakeup_thread(mddev->thread);
4352 wake_up(&mddev->sb_wait);
4353 } else /* st == clean */ {
4354 restart_array(mddev);
4355 if (!set_in_sync(mddev))
4359 sysfs_notify_dirent_safe(mddev->sysfs_state);
4360 spin_unlock(&mddev->lock);
4363 err = mddev_lock(mddev);
4371 /* stopping an active array */
4372 err = do_md_stop(mddev, 0, NULL);
4375 /* stopping an active array */
4377 err = do_md_stop(mddev, 2, NULL);
4379 err = 0; /* already inactive */
4382 break; /* not supported yet */
4385 err = md_set_readonly(mddev, NULL);
4387 mddev->ro = MD_RDONLY;
4388 set_disk_ro(mddev->gendisk, 1);
4389 err = do_md_run(mddev);
4394 if (md_is_rdwr(mddev))
4395 err = md_set_readonly(mddev, NULL);
4396 else if (mddev->ro == MD_RDONLY)
4397 err = restart_array(mddev);
4399 mddev->ro = MD_AUTO_READ;
4400 set_disk_ro(mddev->gendisk, 0);
4403 mddev->ro = MD_AUTO_READ;
4404 err = do_md_run(mddev);
4409 err = restart_array(mddev);
4412 spin_lock(&mddev->lock);
4413 if (!set_in_sync(mddev))
4415 spin_unlock(&mddev->lock);
4421 err = restart_array(mddev);
4424 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4425 wake_up(&mddev->sb_wait);
4428 mddev->ro = MD_RDWR;
4429 set_disk_ro(mddev->gendisk, 0);
4430 err = do_md_run(mddev);
4436 /* these cannot be set */
4441 if (mddev->hold_active == UNTIL_IOCTL)
4442 mddev->hold_active = 0;
4443 sysfs_notify_dirent_safe(mddev->sysfs_state);
4445 mddev_unlock(mddev);
4448 static struct md_sysfs_entry md_array_state =
4449 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4452 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4453 return sprintf(page, "%d\n",
4454 atomic_read(&mddev->max_corr_read_errors));
4458 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4463 rv = kstrtouint(buf, 10, &n);
4466 atomic_set(&mddev->max_corr_read_errors, n);
4470 static struct md_sysfs_entry max_corr_read_errors =
4471 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4472 max_corrected_read_errors_store);
4475 null_show(struct mddev *mddev, char *page)
4480 /* need to ensure rdev_delayed_delete() has completed */
4481 static void flush_rdev_wq(struct mddev *mddev)
4483 struct md_rdev *rdev;
4486 rdev_for_each_rcu(rdev, mddev)
4487 if (work_pending(&rdev->del_work)) {
4488 flush_workqueue(md_rdev_misc_wq);
4495 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4497 /* buf must be %d:%d\n? giving major and minor numbers */
4498 /* The new device is added to the array.
4499 * If the array has a persistent superblock, we read the
4500 * superblock to initialise info and check validity.
4501 * Otherwise, only checking done is that in bind_rdev_to_array,
4502 * which mainly checks size.
4505 int major = simple_strtoul(buf, &e, 10);
4508 struct md_rdev *rdev;
4511 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4513 minor = simple_strtoul(e+1, &e, 10);
4514 if (*e && *e != '\n')
4516 dev = MKDEV(major, minor);
4517 if (major != MAJOR(dev) ||
4518 minor != MINOR(dev))
4521 flush_rdev_wq(mddev);
4522 err = mddev_lock(mddev);
4525 if (mddev->persistent) {
4526 rdev = md_import_device(dev, mddev->major_version,
4527 mddev->minor_version);
4528 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4529 struct md_rdev *rdev0
4530 = list_entry(mddev->disks.next,
4531 struct md_rdev, same_set);
4532 err = super_types[mddev->major_version]
4533 .load_super(rdev, rdev0, mddev->minor_version);
4537 } else if (mddev->external)
4538 rdev = md_import_device(dev, -2, -1);
4540 rdev = md_import_device(dev, -1, -1);
4543 mddev_unlock(mddev);
4544 return PTR_ERR(rdev);
4546 err = bind_rdev_to_array(rdev, mddev);
4549 export_rdev(rdev, mddev);
4550 mddev_unlock(mddev);
4553 return err ? err : len;
4556 static struct md_sysfs_entry md_new_device =
4557 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4560 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4563 unsigned long chunk, end_chunk;
4566 err = mddev_lock(mddev);
4571 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4573 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4574 if (buf == end) break;
4575 if (*end == '-') { /* range */
4577 end_chunk = simple_strtoul(buf, &end, 0);
4578 if (buf == end) break;
4580 if (*end && !isspace(*end)) break;
4581 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4582 buf = skip_spaces(end);
4584 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4586 mddev_unlock(mddev);
4590 static struct md_sysfs_entry md_bitmap =
4591 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4594 size_show(struct mddev *mddev, char *page)
4596 return sprintf(page, "%llu\n",
4597 (unsigned long long)mddev->dev_sectors / 2);
4600 static int update_size(struct mddev *mddev, sector_t num_sectors);
4603 size_store(struct mddev *mddev, const char *buf, size_t len)
4605 /* If array is inactive, we can reduce the component size, but
4606 * not increase it (except from 0).
4607 * If array is active, we can try an on-line resize
4610 int err = strict_blocks_to_sectors(buf, §ors);
4614 err = mddev_lock(mddev);
4618 err = update_size(mddev, sectors);
4620 md_update_sb(mddev, 1);
4622 if (mddev->dev_sectors == 0 ||
4623 mddev->dev_sectors > sectors)
4624 mddev->dev_sectors = sectors;
4628 mddev_unlock(mddev);
4629 return err ? err : len;
4632 static struct md_sysfs_entry md_size =
4633 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4635 /* Metadata version.
4637 * 'none' for arrays with no metadata (good luck...)
4638 * 'external' for arrays with externally managed metadata,
4639 * or N.M for internally known formats
4642 metadata_show(struct mddev *mddev, char *page)
4644 if (mddev->persistent)
4645 return sprintf(page, "%d.%d\n",
4646 mddev->major_version, mddev->minor_version);
4647 else if (mddev->external)
4648 return sprintf(page, "external:%s\n", mddev->metadata_type);
4650 return sprintf(page, "none\n");
4654 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4659 /* Changing the details of 'external' metadata is
4660 * always permitted. Otherwise there must be
4661 * no devices attached to the array.
4664 err = mddev_lock(mddev);
4668 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4670 else if (!list_empty(&mddev->disks))
4674 if (cmd_match(buf, "none")) {
4675 mddev->persistent = 0;
4676 mddev->external = 0;
4677 mddev->major_version = 0;
4678 mddev->minor_version = 90;
4681 if (strncmp(buf, "external:", 9) == 0) {
4682 size_t namelen = len-9;
4683 if (namelen >= sizeof(mddev->metadata_type))
4684 namelen = sizeof(mddev->metadata_type)-1;
4685 strncpy(mddev->metadata_type, buf+9, namelen);
4686 mddev->metadata_type[namelen] = 0;
4687 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4688 mddev->metadata_type[--namelen] = 0;
4689 mddev->persistent = 0;
4690 mddev->external = 1;
4691 mddev->major_version = 0;
4692 mddev->minor_version = 90;
4695 major = simple_strtoul(buf, &e, 10);
4697 if (e==buf || *e != '.')
4700 minor = simple_strtoul(buf, &e, 10);
4701 if (e==buf || (*e && *e != '\n') )
4704 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4706 mddev->major_version = major;
4707 mddev->minor_version = minor;
4708 mddev->persistent = 1;
4709 mddev->external = 0;
4712 mddev_unlock(mddev);
4716 static struct md_sysfs_entry md_metadata =
4717 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4720 action_show(struct mddev *mddev, char *page)
4722 char *type = "idle";
4723 unsigned long recovery = mddev->recovery;
4724 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4726 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4727 (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4728 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4730 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4731 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4733 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4737 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4739 else if (mddev->reshape_position != MaxSector)
4742 return sprintf(page, "%s\n", type);
4746 action_store(struct mddev *mddev, const char *page, size_t len)
4748 if (!mddev->pers || !mddev->pers->sync_request)
4752 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4753 if (cmd_match(page, "frozen"))
4754 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4756 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4757 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4758 mddev_lock(mddev) == 0) {
4759 if (work_pending(&mddev->del_work))
4760 flush_workqueue(md_misc_wq);
4761 if (mddev->sync_thread) {
4762 sector_t save_rp = mddev->reshape_position;
4764 mddev_unlock(mddev);
4765 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4766 md_unregister_thread(&mddev->sync_thread);
4767 mddev_lock_nointr(mddev);
4769 * set RECOVERY_INTR again and restore reshape
4770 * position in case others changed them after
4771 * got lock, eg, reshape_position_store and
4772 * md_check_recovery.
4774 mddev->reshape_position = save_rp;
4775 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4776 md_reap_sync_thread(mddev);
4778 mddev_unlock(mddev);
4780 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4782 else if (cmd_match(page, "resync"))
4783 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4784 else if (cmd_match(page, "recover")) {
4785 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4786 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4787 } else if (cmd_match(page, "reshape")) {
4789 if (mddev->pers->start_reshape == NULL)
4791 err = mddev_lock(mddev);
4793 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4795 } else if (mddev->reshape_position == MaxSector ||
4796 mddev->pers->check_reshape == NULL ||
4797 mddev->pers->check_reshape(mddev)) {
4798 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4799 err = mddev->pers->start_reshape(mddev);
4802 * If reshape is still in progress, and
4803 * md_check_recovery() can continue to reshape,
4804 * don't restart reshape because data can be
4805 * corrupted for raid456.
4807 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4809 mddev_unlock(mddev);
4813 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4815 if (cmd_match(page, "check"))
4816 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4817 else if (!cmd_match(page, "repair"))
4819 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4820 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4821 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4823 if (mddev->ro == MD_AUTO_READ) {
4824 /* A write to sync_action is enough to justify
4825 * canceling read-auto mode
4827 mddev->ro = MD_RDWR;
4828 md_wakeup_thread(mddev->sync_thread);
4830 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4831 md_wakeup_thread(mddev->thread);
4832 sysfs_notify_dirent_safe(mddev->sysfs_action);
4836 static struct md_sysfs_entry md_scan_mode =
4837 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4840 last_sync_action_show(struct mddev *mddev, char *page)
4842 return sprintf(page, "%s\n", mddev->last_sync_action);
4845 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4848 mismatch_cnt_show(struct mddev *mddev, char *page)
4850 return sprintf(page, "%llu\n",
4851 (unsigned long long)
4852 atomic64_read(&mddev->resync_mismatches));
4855 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4858 sync_min_show(struct mddev *mddev, char *page)
4860 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4861 mddev->sync_speed_min ? "local": "system");
4865 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4870 if (strncmp(buf, "system", 6)==0) {
4873 rv = kstrtouint(buf, 10, &min);
4879 mddev->sync_speed_min = min;
4883 static struct md_sysfs_entry md_sync_min =
4884 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4887 sync_max_show(struct mddev *mddev, char *page)
4889 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4890 mddev->sync_speed_max ? "local": "system");
4894 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4899 if (strncmp(buf, "system", 6)==0) {
4902 rv = kstrtouint(buf, 10, &max);
4908 mddev->sync_speed_max = max;
4912 static struct md_sysfs_entry md_sync_max =
4913 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4916 degraded_show(struct mddev *mddev, char *page)
4918 return sprintf(page, "%d\n", mddev->degraded);
4920 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4923 sync_force_parallel_show(struct mddev *mddev, char *page)
4925 return sprintf(page, "%d\n", mddev->parallel_resync);
4929 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4933 if (kstrtol(buf, 10, &n))
4936 if (n != 0 && n != 1)
4939 mddev->parallel_resync = n;
4941 if (mddev->sync_thread)
4942 wake_up(&resync_wait);
4947 /* force parallel resync, even with shared block devices */
4948 static struct md_sysfs_entry md_sync_force_parallel =
4949 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4950 sync_force_parallel_show, sync_force_parallel_store);
4953 sync_speed_show(struct mddev *mddev, char *page)
4955 unsigned long resync, dt, db;
4956 if (mddev->curr_resync == MD_RESYNC_NONE)
4957 return sprintf(page, "none\n");
4958 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4959 dt = (jiffies - mddev->resync_mark) / HZ;
4961 db = resync - mddev->resync_mark_cnt;
4962 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4965 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4968 sync_completed_show(struct mddev *mddev, char *page)
4970 unsigned long long max_sectors, resync;
4972 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4973 return sprintf(page, "none\n");
4975 if (mddev->curr_resync == MD_RESYNC_YIELDED ||
4976 mddev->curr_resync == MD_RESYNC_DELAYED)
4977 return sprintf(page, "delayed\n");
4979 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4980 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4981 max_sectors = mddev->resync_max_sectors;
4983 max_sectors = mddev->dev_sectors;
4985 resync = mddev->curr_resync_completed;
4986 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4989 static struct md_sysfs_entry md_sync_completed =
4990 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4993 min_sync_show(struct mddev *mddev, char *page)
4995 return sprintf(page, "%llu\n",
4996 (unsigned long long)mddev->resync_min);
4999 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5001 unsigned long long min;
5004 if (kstrtoull(buf, 10, &min))
5007 spin_lock(&mddev->lock);
5009 if (min > mddev->resync_max)
5013 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5016 /* Round down to multiple of 4K for safety */
5017 mddev->resync_min = round_down(min, 8);
5021 spin_unlock(&mddev->lock);
5025 static struct md_sysfs_entry md_min_sync =
5026 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5029 max_sync_show(struct mddev *mddev, char *page)
5031 if (mddev->resync_max == MaxSector)
5032 return sprintf(page, "max\n");
5034 return sprintf(page, "%llu\n",
5035 (unsigned long long)mddev->resync_max);
5038 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5041 spin_lock(&mddev->lock);
5042 if (strncmp(buf, "max", 3) == 0)
5043 mddev->resync_max = MaxSector;
5045 unsigned long long max;
5049 if (kstrtoull(buf, 10, &max))
5051 if (max < mddev->resync_min)
5055 if (max < mddev->resync_max && md_is_rdwr(mddev) &&
5056 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5059 /* Must be a multiple of chunk_size */
5060 chunk = mddev->chunk_sectors;
5062 sector_t temp = max;
5065 if (sector_div(temp, chunk))
5068 mddev->resync_max = max;
5070 wake_up(&mddev->recovery_wait);
5073 spin_unlock(&mddev->lock);
5077 static struct md_sysfs_entry md_max_sync =
5078 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5081 suspend_lo_show(struct mddev *mddev, char *page)
5083 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5087 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5089 unsigned long long new;
5092 err = kstrtoull(buf, 10, &new);
5095 if (new != (sector_t)new)
5098 err = mddev_lock(mddev);
5102 if (mddev->pers == NULL ||
5103 mddev->pers->quiesce == NULL)
5105 mddev_suspend(mddev);
5106 mddev->suspend_lo = new;
5107 mddev_resume(mddev);
5111 mddev_unlock(mddev);
5114 static struct md_sysfs_entry md_suspend_lo =
5115 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5118 suspend_hi_show(struct mddev *mddev, char *page)
5120 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5124 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5126 unsigned long long new;
5129 err = kstrtoull(buf, 10, &new);
5132 if (new != (sector_t)new)
5135 err = mddev_lock(mddev);
5139 if (mddev->pers == NULL)
5142 mddev_suspend(mddev);
5143 mddev->suspend_hi = new;
5144 mddev_resume(mddev);
5148 mddev_unlock(mddev);
5151 static struct md_sysfs_entry md_suspend_hi =
5152 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5155 reshape_position_show(struct mddev *mddev, char *page)
5157 if (mddev->reshape_position != MaxSector)
5158 return sprintf(page, "%llu\n",
5159 (unsigned long long)mddev->reshape_position);
5160 strcpy(page, "none\n");
5165 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5167 struct md_rdev *rdev;
5168 unsigned long long new;
5171 err = kstrtoull(buf, 10, &new);
5174 if (new != (sector_t)new)
5176 err = mddev_lock(mddev);
5182 mddev->reshape_position = new;
5183 mddev->delta_disks = 0;
5184 mddev->reshape_backwards = 0;
5185 mddev->new_level = mddev->level;
5186 mddev->new_layout = mddev->layout;
5187 mddev->new_chunk_sectors = mddev->chunk_sectors;
5188 rdev_for_each(rdev, mddev)
5189 rdev->new_data_offset = rdev->data_offset;
5192 mddev_unlock(mddev);
5196 static struct md_sysfs_entry md_reshape_position =
5197 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5198 reshape_position_store);
5201 reshape_direction_show(struct mddev *mddev, char *page)
5203 return sprintf(page, "%s\n",
5204 mddev->reshape_backwards ? "backwards" : "forwards");
5208 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5213 if (cmd_match(buf, "forwards"))
5215 else if (cmd_match(buf, "backwards"))
5219 if (mddev->reshape_backwards == backwards)
5222 err = mddev_lock(mddev);
5225 /* check if we are allowed to change */
5226 if (mddev->delta_disks)
5228 else if (mddev->persistent &&
5229 mddev->major_version == 0)
5232 mddev->reshape_backwards = backwards;
5233 mddev_unlock(mddev);
5237 static struct md_sysfs_entry md_reshape_direction =
5238 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5239 reshape_direction_store);
5242 array_size_show(struct mddev *mddev, char *page)
5244 if (mddev->external_size)
5245 return sprintf(page, "%llu\n",
5246 (unsigned long long)mddev->array_sectors/2);
5248 return sprintf(page, "default\n");
5252 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5257 err = mddev_lock(mddev);
5261 /* cluster raid doesn't support change array_sectors */
5262 if (mddev_is_clustered(mddev)) {
5263 mddev_unlock(mddev);
5267 if (strncmp(buf, "default", 7) == 0) {
5269 sectors = mddev->pers->size(mddev, 0, 0);
5271 sectors = mddev->array_sectors;
5273 mddev->external_size = 0;
5275 if (strict_blocks_to_sectors(buf, §ors) < 0)
5277 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5280 mddev->external_size = 1;
5284 mddev->array_sectors = sectors;
5286 set_capacity_and_notify(mddev->gendisk,
5287 mddev->array_sectors);
5289 mddev_unlock(mddev);
5293 static struct md_sysfs_entry md_array_size =
5294 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5298 consistency_policy_show(struct mddev *mddev, char *page)
5302 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5303 ret = sprintf(page, "journal\n");
5304 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5305 ret = sprintf(page, "ppl\n");
5306 } else if (mddev->bitmap) {
5307 ret = sprintf(page, "bitmap\n");
5308 } else if (mddev->pers) {
5309 if (mddev->pers->sync_request)
5310 ret = sprintf(page, "resync\n");
5312 ret = sprintf(page, "none\n");
5314 ret = sprintf(page, "unknown\n");
5321 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5326 if (mddev->pers->change_consistency_policy)
5327 err = mddev->pers->change_consistency_policy(mddev, buf);
5330 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5331 set_bit(MD_HAS_PPL, &mddev->flags);
5336 return err ? err : len;
5339 static struct md_sysfs_entry md_consistency_policy =
5340 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5341 consistency_policy_store);
5343 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5345 return sprintf(page, "%d\n", mddev->fail_last_dev);
5349 * Setting fail_last_dev to true to allow last device to be forcibly removed
5350 * from RAID1/RAID10.
5353 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5358 ret = kstrtobool(buf, &value);
5362 if (value != mddev->fail_last_dev)
5363 mddev->fail_last_dev = value;
5367 static struct md_sysfs_entry md_fail_last_dev =
5368 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5369 fail_last_dev_store);
5371 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5373 if (mddev->pers == NULL || (mddev->pers->level != 1))
5374 return sprintf(page, "n/a\n");
5376 return sprintf(page, "%d\n", mddev->serialize_policy);
5380 * Setting serialize_policy to true to enforce write IO is not reordered
5384 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5389 err = kstrtobool(buf, &value);
5393 if (value == mddev->serialize_policy)
5396 err = mddev_lock(mddev);
5399 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5400 pr_err("md: serialize_policy is only effective for raid1\n");
5405 mddev_suspend(mddev);
5407 mddev_create_serial_pool(mddev, NULL, true);
5409 mddev_destroy_serial_pool(mddev, NULL, true);
5410 mddev->serialize_policy = value;
5411 mddev_resume(mddev);
5413 mddev_unlock(mddev);
5417 static struct md_sysfs_entry md_serialize_policy =
5418 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5419 serialize_policy_store);
5422 static struct attribute *md_default_attrs[] = {
5425 &md_raid_disks.attr,
5427 &md_chunk_size.attr,
5429 &md_resync_start.attr,
5431 &md_new_device.attr,
5432 &md_safe_delay.attr,
5433 &md_array_state.attr,
5434 &md_reshape_position.attr,
5435 &md_reshape_direction.attr,
5436 &md_array_size.attr,
5437 &max_corr_read_errors.attr,
5438 &md_consistency_policy.attr,
5439 &md_fail_last_dev.attr,
5440 &md_serialize_policy.attr,
5444 static const struct attribute_group md_default_group = {
5445 .attrs = md_default_attrs,
5448 static struct attribute *md_redundancy_attrs[] = {
5450 &md_last_scan_mode.attr,
5451 &md_mismatches.attr,
5454 &md_sync_speed.attr,
5455 &md_sync_force_parallel.attr,
5456 &md_sync_completed.attr,
5459 &md_suspend_lo.attr,
5460 &md_suspend_hi.attr,
5465 static const struct attribute_group md_redundancy_group = {
5467 .attrs = md_redundancy_attrs,
5470 static const struct attribute_group *md_attr_groups[] = {
5477 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5479 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5480 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5485 spin_lock(&all_mddevs_lock);
5486 if (!mddev_get(mddev)) {
5487 spin_unlock(&all_mddevs_lock);
5490 spin_unlock(&all_mddevs_lock);
5492 rv = entry->show(mddev, page);
5498 md_attr_store(struct kobject *kobj, struct attribute *attr,
5499 const char *page, size_t length)
5501 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5502 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5507 if (!capable(CAP_SYS_ADMIN))
5509 spin_lock(&all_mddevs_lock);
5510 if (!mddev_get(mddev)) {
5511 spin_unlock(&all_mddevs_lock);
5514 spin_unlock(&all_mddevs_lock);
5515 rv = entry->store(mddev, page, length);
5520 static void md_kobj_release(struct kobject *ko)
5522 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5524 if (mddev->sysfs_state)
5525 sysfs_put(mddev->sysfs_state);
5526 if (mddev->sysfs_level)
5527 sysfs_put(mddev->sysfs_level);
5529 del_gendisk(mddev->gendisk);
5530 put_disk(mddev->gendisk);
5533 static const struct sysfs_ops md_sysfs_ops = {
5534 .show = md_attr_show,
5535 .store = md_attr_store,
5537 static const struct kobj_type md_ktype = {
5538 .release = md_kobj_release,
5539 .sysfs_ops = &md_sysfs_ops,
5540 .default_groups = md_attr_groups,
5545 static void mddev_delayed_delete(struct work_struct *ws)
5547 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5549 kobject_put(&mddev->kobj);
5552 static void no_op(struct percpu_ref *r) {}
5554 int mddev_init_writes_pending(struct mddev *mddev)
5556 if (mddev->writes_pending.percpu_count_ptr)
5558 if (percpu_ref_init(&mddev->writes_pending, no_op,
5559 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5561 /* We want to start with the refcount at zero */
5562 percpu_ref_put(&mddev->writes_pending);
5565 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5567 struct mddev *md_alloc(dev_t dev, char *name)
5570 * If dev is zero, name is the name of a device to allocate with
5571 * an arbitrary minor number. It will be "md_???"
5572 * If dev is non-zero it must be a device number with a MAJOR of
5573 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5574 * the device is being created by opening a node in /dev.
5575 * If "name" is not NULL, the device is being created by
5576 * writing to /sys/module/md_mod/parameters/new_array.
5578 static DEFINE_MUTEX(disks_mutex);
5579 struct mddev *mddev;
5580 struct gendisk *disk;
5587 * Wait for any previous instance of this device to be completely
5588 * removed (mddev_delayed_delete).
5590 flush_workqueue(md_misc_wq);
5591 flush_workqueue(md_rdev_misc_wq);
5593 mutex_lock(&disks_mutex);
5594 mddev = mddev_alloc(dev);
5595 if (IS_ERR(mddev)) {
5596 error = PTR_ERR(mddev);
5600 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5601 shift = partitioned ? MdpMinorShift : 0;
5602 unit = MINOR(mddev->unit) >> shift;
5605 /* Need to ensure that 'name' is not a duplicate.
5607 struct mddev *mddev2;
5608 spin_lock(&all_mddevs_lock);
5610 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5611 if (mddev2->gendisk &&
5612 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5613 spin_unlock(&all_mddevs_lock);
5615 goto out_free_mddev;
5617 spin_unlock(&all_mddevs_lock);
5621 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5623 mddev->hold_active = UNTIL_STOP;
5626 disk = blk_alloc_disk(NUMA_NO_NODE);
5628 goto out_free_mddev;
5630 disk->major = MAJOR(mddev->unit);
5631 disk->first_minor = unit << shift;
5632 disk->minors = 1 << shift;
5634 strcpy(disk->disk_name, name);
5635 else if (partitioned)
5636 sprintf(disk->disk_name, "md_d%d", unit);
5638 sprintf(disk->disk_name, "md%d", unit);
5639 disk->fops = &md_fops;
5640 disk->private_data = mddev;
5642 mddev->queue = disk->queue;
5643 blk_set_stacking_limits(&mddev->queue->limits);
5644 blk_queue_write_cache(mddev->queue, true, true);
5645 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5646 mddev->gendisk = disk;
5647 error = add_disk(disk);
5651 kobject_init(&mddev->kobj, &md_ktype);
5652 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5655 * The disk is already live at this point. Clear the hold flag
5656 * and let mddev_put take care of the deletion, as it isn't any
5657 * different from a normal close on last release now.
5659 mddev->hold_active = 0;
5660 mutex_unlock(&disks_mutex);
5662 return ERR_PTR(error);
5665 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5666 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5667 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5668 mutex_unlock(&disks_mutex);
5676 mutex_unlock(&disks_mutex);
5677 return ERR_PTR(error);
5680 static int md_alloc_and_put(dev_t dev, char *name)
5682 struct mddev *mddev = md_alloc(dev, name);
5685 return PTR_ERR(mddev);
5690 static void md_probe(dev_t dev)
5692 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5695 md_alloc_and_put(dev, NULL);
5698 static int add_named_array(const char *val, const struct kernel_param *kp)
5701 * val must be "md_*" or "mdNNN".
5702 * For "md_*" we allocate an array with a large free minor number, and
5703 * set the name to val. val must not already be an active name.
5704 * For "mdNNN" we allocate an array with the minor number NNN
5705 * which must not already be in use.
5707 int len = strlen(val);
5708 char buf[DISK_NAME_LEN];
5709 unsigned long devnum;
5711 while (len && val[len-1] == '\n')
5713 if (len >= DISK_NAME_LEN)
5715 strscpy(buf, val, len+1);
5716 if (strncmp(buf, "md_", 3) == 0)
5717 return md_alloc_and_put(0, buf);
5718 if (strncmp(buf, "md", 2) == 0 &&
5720 kstrtoul(buf+2, 10, &devnum) == 0 &&
5721 devnum <= MINORMASK)
5722 return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
5727 static void md_safemode_timeout(struct timer_list *t)
5729 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5731 mddev->safemode = 1;
5732 if (mddev->external)
5733 sysfs_notify_dirent_safe(mddev->sysfs_state);
5735 md_wakeup_thread(mddev->thread);
5738 static int start_dirty_degraded;
5739 static void active_io_release(struct percpu_ref *ref)
5741 struct mddev *mddev = container_of(ref, struct mddev, active_io);
5743 wake_up(&mddev->sb_wait);
5746 int md_run(struct mddev *mddev)
5749 struct md_rdev *rdev;
5750 struct md_personality *pers;
5753 if (list_empty(&mddev->disks))
5754 /* cannot run an array with no devices.. */
5759 /* Cannot run until previous stop completes properly */
5760 if (mddev->sysfs_active)
5764 * Analyze all RAID superblock(s)
5766 if (!mddev->raid_disks) {
5767 if (!mddev->persistent)
5769 err = analyze_sbs(mddev);
5774 if (mddev->level != LEVEL_NONE)
5775 request_module("md-level-%d", mddev->level);
5776 else if (mddev->clevel[0])
5777 request_module("md-%s", mddev->clevel);
5780 * Drop all container device buffers, from now on
5781 * the only valid external interface is through the md
5784 mddev->has_superblocks = false;
5785 rdev_for_each(rdev, mddev) {
5786 if (test_bit(Faulty, &rdev->flags))
5788 sync_blockdev(rdev->bdev);
5789 invalidate_bdev(rdev->bdev);
5790 if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
5791 mddev->ro = MD_RDONLY;
5793 set_disk_ro(mddev->gendisk, 1);
5797 mddev->has_superblocks = true;
5799 /* perform some consistency tests on the device.
5800 * We don't want the data to overlap the metadata,
5801 * Internal Bitmap issues have been handled elsewhere.
5803 if (rdev->meta_bdev) {
5804 /* Nothing to check */;
5805 } else if (rdev->data_offset < rdev->sb_start) {
5806 if (mddev->dev_sectors &&
5807 rdev->data_offset + mddev->dev_sectors
5809 pr_warn("md: %s: data overlaps metadata\n",
5814 if (rdev->sb_start + rdev->sb_size/512
5815 > rdev->data_offset) {
5816 pr_warn("md: %s: metadata overlaps data\n",
5821 sysfs_notify_dirent_safe(rdev->sysfs_state);
5822 nowait = nowait && bdev_nowait(rdev->bdev);
5825 err = percpu_ref_init(&mddev->active_io, active_io_release,
5826 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL);
5830 if (!bioset_initialized(&mddev->bio_set)) {
5831 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5833 goto exit_active_io;
5835 if (!bioset_initialized(&mddev->sync_set)) {
5836 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5841 spin_lock(&pers_lock);
5842 pers = find_pers(mddev->level, mddev->clevel);
5843 if (!pers || !try_module_get(pers->owner)) {
5844 spin_unlock(&pers_lock);
5845 if (mddev->level != LEVEL_NONE)
5846 pr_warn("md: personality for level %d is not loaded!\n",
5849 pr_warn("md: personality for level %s is not loaded!\n",
5854 spin_unlock(&pers_lock);
5855 if (mddev->level != pers->level) {
5856 mddev->level = pers->level;
5857 mddev->new_level = pers->level;
5859 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5861 if (mddev->reshape_position != MaxSector &&
5862 pers->start_reshape == NULL) {
5863 /* This personality cannot handle reshaping... */
5864 module_put(pers->owner);
5869 if (pers->sync_request) {
5870 /* Warn if this is a potentially silly
5873 struct md_rdev *rdev2;
5876 rdev_for_each(rdev, mddev)
5877 rdev_for_each(rdev2, mddev) {
5879 rdev->bdev->bd_disk ==
5880 rdev2->bdev->bd_disk) {
5881 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
5890 pr_warn("True protection against single-disk failure might be compromised.\n");
5893 mddev->recovery = 0;
5894 /* may be over-ridden by personality */
5895 mddev->resync_max_sectors = mddev->dev_sectors;
5897 mddev->ok_start_degraded = start_dirty_degraded;
5899 if (start_readonly && md_is_rdwr(mddev))
5900 mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
5902 err = pers->run(mddev);
5904 pr_warn("md: pers->run() failed ...\n");
5905 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5906 WARN_ONCE(!mddev->external_size,
5907 "%s: default size too small, but 'external_size' not in effect?\n",
5909 pr_warn("md: invalid array_size %llu > default size %llu\n",
5910 (unsigned long long)mddev->array_sectors / 2,
5911 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5914 if (err == 0 && pers->sync_request &&
5915 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5916 struct bitmap *bitmap;
5918 bitmap = md_bitmap_create(mddev, -1);
5919 if (IS_ERR(bitmap)) {
5920 err = PTR_ERR(bitmap);
5921 pr_warn("%s: failed to create bitmap (%d)\n",
5922 mdname(mddev), err);
5924 mddev->bitmap = bitmap;
5930 if (mddev->bitmap_info.max_write_behind > 0) {
5931 bool create_pool = false;
5933 rdev_for_each(rdev, mddev) {
5934 if (test_bit(WriteMostly, &rdev->flags) &&
5935 rdev_init_serial(rdev))
5938 if (create_pool && mddev->serial_info_pool == NULL) {
5939 mddev->serial_info_pool =
5940 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5941 sizeof(struct serial_info));
5942 if (!mddev->serial_info_pool) {
5952 rdev_for_each(rdev, mddev) {
5953 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
5958 if (mddev->degraded)
5961 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5963 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5964 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
5966 /* Set the NOWAIT flags if all underlying devices support it */
5968 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
5970 if (pers->sync_request) {
5971 if (mddev->kobj.sd &&
5972 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5973 pr_warn("md: cannot register extra attributes for %s\n",
5975 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5976 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
5977 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
5978 } else if (mddev->ro == MD_AUTO_READ)
5979 mddev->ro = MD_RDWR;
5981 atomic_set(&mddev->max_corr_read_errors,
5982 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5983 mddev->safemode = 0;
5984 if (mddev_is_clustered(mddev))
5985 mddev->safemode_delay = 0;
5987 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
5990 spin_lock(&mddev->lock);
5992 spin_unlock(&mddev->lock);
5993 rdev_for_each(rdev, mddev)
5994 if (rdev->raid_disk >= 0)
5995 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
5997 if (mddev->degraded && md_is_rdwr(mddev))
5998 /* This ensures that recovering status is reported immediately
5999 * via sysfs - until a lack of spares is confirmed.
6001 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6002 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6004 if (mddev->sb_flags)
6005 md_update_sb(mddev, 0);
6011 mddev_detach(mddev);
6013 pers->free(mddev, mddev->private);
6014 mddev->private = NULL;
6015 module_put(pers->owner);
6016 md_bitmap_destroy(mddev);
6018 bioset_exit(&mddev->sync_set);
6020 bioset_exit(&mddev->bio_set);
6022 percpu_ref_exit(&mddev->active_io);
6025 EXPORT_SYMBOL_GPL(md_run);
6027 int do_md_run(struct mddev *mddev)
6031 set_bit(MD_NOT_READY, &mddev->flags);
6032 err = md_run(mddev);
6035 err = md_bitmap_load(mddev);
6037 md_bitmap_destroy(mddev);
6041 if (mddev_is_clustered(mddev))
6042 md_allow_write(mddev);
6044 /* run start up tasks that require md_thread */
6047 md_wakeup_thread(mddev->thread);
6048 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6050 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6051 clear_bit(MD_NOT_READY, &mddev->flags);
6053 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6054 sysfs_notify_dirent_safe(mddev->sysfs_state);
6055 sysfs_notify_dirent_safe(mddev->sysfs_action);
6056 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6058 clear_bit(MD_NOT_READY, &mddev->flags);
6062 int md_start(struct mddev *mddev)
6066 if (mddev->pers->start) {
6067 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6068 md_wakeup_thread(mddev->thread);
6069 ret = mddev->pers->start(mddev);
6070 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6071 md_wakeup_thread(mddev->sync_thread);
6075 EXPORT_SYMBOL_GPL(md_start);
6077 static int restart_array(struct mddev *mddev)
6079 struct gendisk *disk = mddev->gendisk;
6080 struct md_rdev *rdev;
6081 bool has_journal = false;
6082 bool has_readonly = false;
6084 /* Complain if it has no devices */
6085 if (list_empty(&mddev->disks))
6089 if (md_is_rdwr(mddev))
6093 rdev_for_each_rcu(rdev, mddev) {
6094 if (test_bit(Journal, &rdev->flags) &&
6095 !test_bit(Faulty, &rdev->flags))
6097 if (rdev_read_only(rdev))
6098 has_readonly = true;
6101 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6102 /* Don't restart rw with journal missing/faulty */
6107 mddev->safemode = 0;
6108 mddev->ro = MD_RDWR;
6109 set_disk_ro(disk, 0);
6110 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6111 /* Kick recovery or resync if necessary */
6112 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6113 md_wakeup_thread(mddev->thread);
6114 md_wakeup_thread(mddev->sync_thread);
6115 sysfs_notify_dirent_safe(mddev->sysfs_state);
6119 static void md_clean(struct mddev *mddev)
6121 mddev->array_sectors = 0;
6122 mddev->external_size = 0;
6123 mddev->dev_sectors = 0;
6124 mddev->raid_disks = 0;
6125 mddev->recovery_cp = 0;
6126 mddev->resync_min = 0;
6127 mddev->resync_max = MaxSector;
6128 mddev->reshape_position = MaxSector;
6129 mddev->external = 0;
6130 mddev->persistent = 0;
6131 mddev->level = LEVEL_NONE;
6132 mddev->clevel[0] = 0;
6134 mddev->sb_flags = 0;
6135 mddev->ro = MD_RDWR;
6136 mddev->metadata_type[0] = 0;
6137 mddev->chunk_sectors = 0;
6138 mddev->ctime = mddev->utime = 0;
6140 mddev->max_disks = 0;
6142 mddev->can_decrease_events = 0;
6143 mddev->delta_disks = 0;
6144 mddev->reshape_backwards = 0;
6145 mddev->new_level = LEVEL_NONE;
6146 mddev->new_layout = 0;
6147 mddev->new_chunk_sectors = 0;
6148 mddev->curr_resync = MD_RESYNC_NONE;
6149 atomic64_set(&mddev->resync_mismatches, 0);
6150 mddev->suspend_lo = mddev->suspend_hi = 0;
6151 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6152 mddev->recovery = 0;
6155 mddev->degraded = 0;
6156 mddev->safemode = 0;
6157 mddev->private = NULL;
6158 mddev->cluster_info = NULL;
6159 mddev->bitmap_info.offset = 0;
6160 mddev->bitmap_info.default_offset = 0;
6161 mddev->bitmap_info.default_space = 0;
6162 mddev->bitmap_info.chunksize = 0;
6163 mddev->bitmap_info.daemon_sleep = 0;
6164 mddev->bitmap_info.max_write_behind = 0;
6165 mddev->bitmap_info.nodes = 0;
6168 static void __md_stop_writes(struct mddev *mddev)
6170 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6171 if (work_pending(&mddev->del_work))
6172 flush_workqueue(md_misc_wq);
6173 if (mddev->sync_thread) {
6174 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6175 md_unregister_thread(&mddev->sync_thread);
6176 md_reap_sync_thread(mddev);
6179 del_timer_sync(&mddev->safemode_timer);
6181 if (mddev->pers && mddev->pers->quiesce) {
6182 mddev->pers->quiesce(mddev, 1);
6183 mddev->pers->quiesce(mddev, 0);
6185 md_bitmap_flush(mddev);
6187 if (md_is_rdwr(mddev) &&
6188 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6190 /* mark array as shutdown cleanly */
6191 if (!mddev_is_clustered(mddev))
6193 md_update_sb(mddev, 1);
6195 /* disable policy to guarantee rdevs free resources for serialization */
6196 mddev->serialize_policy = 0;
6197 mddev_destroy_serial_pool(mddev, NULL, true);
6200 void md_stop_writes(struct mddev *mddev)
6202 mddev_lock_nointr(mddev);
6203 __md_stop_writes(mddev);
6204 mddev_unlock(mddev);
6206 EXPORT_SYMBOL_GPL(md_stop_writes);
6208 static void mddev_detach(struct mddev *mddev)
6210 md_bitmap_wait_behind_writes(mddev);
6211 if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
6212 mddev->pers->quiesce(mddev, 1);
6213 mddev->pers->quiesce(mddev, 0);
6215 md_unregister_thread(&mddev->thread);
6217 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6220 static void __md_stop(struct mddev *mddev)
6222 struct md_personality *pers = mddev->pers;
6223 md_bitmap_destroy(mddev);
6224 mddev_detach(mddev);
6225 /* Ensure ->event_work is done */
6226 if (mddev->event_work.func)
6227 flush_workqueue(md_misc_wq);
6228 spin_lock(&mddev->lock);
6230 spin_unlock(&mddev->lock);
6232 pers->free(mddev, mddev->private);
6233 mddev->private = NULL;
6234 if (pers->sync_request && mddev->to_remove == NULL)
6235 mddev->to_remove = &md_redundancy_group;
6236 module_put(pers->owner);
6237 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6239 percpu_ref_exit(&mddev->active_io);
6240 bioset_exit(&mddev->bio_set);
6241 bioset_exit(&mddev->sync_set);
6244 void md_stop(struct mddev *mddev)
6246 /* stop the array and free an attached data structures.
6247 * This is called from dm-raid
6249 __md_stop_writes(mddev);
6251 percpu_ref_exit(&mddev->writes_pending);
6254 EXPORT_SYMBOL_GPL(md_stop);
6256 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6261 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6263 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6264 md_wakeup_thread(mddev->thread);
6266 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6267 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6268 if (mddev->sync_thread)
6269 /* Thread might be blocked waiting for metadata update
6270 * which will now never happen */
6271 wake_up_process(mddev->sync_thread->tsk);
6273 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6275 mddev_unlock(mddev);
6276 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6278 wait_event(mddev->sb_wait,
6279 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6280 mddev_lock_nointr(mddev);
6282 mutex_lock(&mddev->open_mutex);
6283 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6284 mddev->sync_thread ||
6285 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6286 pr_warn("md: %s still in use.\n",mdname(mddev));
6288 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6289 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6290 md_wakeup_thread(mddev->thread);
6296 __md_stop_writes(mddev);
6299 if (mddev->ro == MD_RDONLY)
6301 mddev->ro = MD_RDONLY;
6302 set_disk_ro(mddev->gendisk, 1);
6303 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6304 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6305 md_wakeup_thread(mddev->thread);
6306 sysfs_notify_dirent_safe(mddev->sysfs_state);
6310 mutex_unlock(&mddev->open_mutex);
6315 * 0 - completely stop and dis-assemble array
6316 * 2 - stop but do not disassemble array
6318 static int do_md_stop(struct mddev *mddev, int mode,
6319 struct block_device *bdev)
6321 struct gendisk *disk = mddev->gendisk;
6322 struct md_rdev *rdev;
6325 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6327 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6328 md_wakeup_thread(mddev->thread);
6330 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6331 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6332 if (mddev->sync_thread)
6333 /* Thread might be blocked waiting for metadata update
6334 * which will now never happen */
6335 wake_up_process(mddev->sync_thread->tsk);
6337 mddev_unlock(mddev);
6338 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6339 !test_bit(MD_RECOVERY_RUNNING,
6340 &mddev->recovery)));
6341 mddev_lock_nointr(mddev);
6343 mutex_lock(&mddev->open_mutex);
6344 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6345 mddev->sysfs_active ||
6346 mddev->sync_thread ||
6347 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6348 pr_warn("md: %s still in use.\n",mdname(mddev));
6349 mutex_unlock(&mddev->open_mutex);
6351 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6352 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6353 md_wakeup_thread(mddev->thread);
6358 if (!md_is_rdwr(mddev))
6359 set_disk_ro(disk, 0);
6361 __md_stop_writes(mddev);
6364 /* tell userspace to handle 'inactive' */
6365 sysfs_notify_dirent_safe(mddev->sysfs_state);
6367 rdev_for_each(rdev, mddev)
6368 if (rdev->raid_disk >= 0)
6369 sysfs_unlink_rdev(mddev, rdev);
6371 set_capacity_and_notify(disk, 0);
6372 mutex_unlock(&mddev->open_mutex);
6375 if (!md_is_rdwr(mddev))
6376 mddev->ro = MD_RDWR;
6378 mutex_unlock(&mddev->open_mutex);
6380 * Free resources if final stop
6383 pr_info("md: %s stopped.\n", mdname(mddev));
6385 if (mddev->bitmap_info.file) {
6386 struct file *f = mddev->bitmap_info.file;
6387 spin_lock(&mddev->lock);
6388 mddev->bitmap_info.file = NULL;
6389 spin_unlock(&mddev->lock);
6392 mddev->bitmap_info.offset = 0;
6394 export_array(mddev);
6397 if (mddev->hold_active == UNTIL_STOP)
6398 mddev->hold_active = 0;
6401 sysfs_notify_dirent_safe(mddev->sysfs_state);
6406 static void autorun_array(struct mddev *mddev)
6408 struct md_rdev *rdev;
6411 if (list_empty(&mddev->disks))
6414 pr_info("md: running: ");
6416 rdev_for_each(rdev, mddev) {
6417 pr_cont("<%pg>", rdev->bdev);
6421 err = do_md_run(mddev);
6423 pr_warn("md: do_md_run() returned %d\n", err);
6424 do_md_stop(mddev, 0, NULL);
6429 * lets try to run arrays based on all disks that have arrived
6430 * until now. (those are in pending_raid_disks)
6432 * the method: pick the first pending disk, collect all disks with
6433 * the same UUID, remove all from the pending list and put them into
6434 * the 'same_array' list. Then order this list based on superblock
6435 * update time (freshest comes first), kick out 'old' disks and
6436 * compare superblocks. If everything's fine then run it.
6438 * If "unit" is allocated, then bump its reference count
6440 static void autorun_devices(int part)
6442 struct md_rdev *rdev0, *rdev, *tmp;
6443 struct mddev *mddev;
6445 pr_info("md: autorun ...\n");
6446 while (!list_empty(&pending_raid_disks)) {
6449 LIST_HEAD(candidates);
6450 rdev0 = list_entry(pending_raid_disks.next,
6451 struct md_rdev, same_set);
6453 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6454 INIT_LIST_HEAD(&candidates);
6455 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6456 if (super_90_load(rdev, rdev0, 0) >= 0) {
6457 pr_debug("md: adding %pg ...\n",
6459 list_move(&rdev->same_set, &candidates);
6462 * now we have a set of devices, with all of them having
6463 * mostly sane superblocks. It's time to allocate the
6467 dev = MKDEV(mdp_major,
6468 rdev0->preferred_minor << MdpMinorShift);
6469 unit = MINOR(dev) >> MdpMinorShift;
6471 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6474 if (rdev0->preferred_minor != unit) {
6475 pr_warn("md: unit number in %pg is bad: %d\n",
6476 rdev0->bdev, rdev0->preferred_minor);
6480 mddev = md_alloc(dev, NULL);
6484 if (mddev_lock(mddev))
6485 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6486 else if (mddev->raid_disks || mddev->major_version
6487 || !list_empty(&mddev->disks)) {
6488 pr_warn("md: %s already running, cannot run %pg\n",
6489 mdname(mddev), rdev0->bdev);
6490 mddev_unlock(mddev);
6492 pr_debug("md: created %s\n", mdname(mddev));
6493 mddev->persistent = 1;
6494 rdev_for_each_list(rdev, tmp, &candidates) {
6495 list_del_init(&rdev->same_set);
6496 if (bind_rdev_to_array(rdev, mddev))
6497 export_rdev(rdev, mddev);
6499 autorun_array(mddev);
6500 mddev_unlock(mddev);
6502 /* on success, candidates will be empty, on error
6505 rdev_for_each_list(rdev, tmp, &candidates) {
6506 list_del_init(&rdev->same_set);
6507 export_rdev(rdev, mddev);
6511 pr_info("md: ... autorun DONE.\n");
6513 #endif /* !MODULE */
6515 static int get_version(void __user *arg)
6519 ver.major = MD_MAJOR_VERSION;
6520 ver.minor = MD_MINOR_VERSION;
6521 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6523 if (copy_to_user(arg, &ver, sizeof(ver)))
6529 static int get_array_info(struct mddev *mddev, void __user *arg)
6531 mdu_array_info_t info;
6532 int nr,working,insync,failed,spare;
6533 struct md_rdev *rdev;
6535 nr = working = insync = failed = spare = 0;
6537 rdev_for_each_rcu(rdev, mddev) {
6539 if (test_bit(Faulty, &rdev->flags))
6543 if (test_bit(In_sync, &rdev->flags))
6545 else if (test_bit(Journal, &rdev->flags))
6546 /* TODO: add journal count to md_u.h */
6554 info.major_version = mddev->major_version;
6555 info.minor_version = mddev->minor_version;
6556 info.patch_version = MD_PATCHLEVEL_VERSION;
6557 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6558 info.level = mddev->level;
6559 info.size = mddev->dev_sectors / 2;
6560 if (info.size != mddev->dev_sectors / 2) /* overflow */
6563 info.raid_disks = mddev->raid_disks;
6564 info.md_minor = mddev->md_minor;
6565 info.not_persistent= !mddev->persistent;
6567 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6570 info.state = (1<<MD_SB_CLEAN);
6571 if (mddev->bitmap && mddev->bitmap_info.offset)
6572 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6573 if (mddev_is_clustered(mddev))
6574 info.state |= (1<<MD_SB_CLUSTERED);
6575 info.active_disks = insync;
6576 info.working_disks = working;
6577 info.failed_disks = failed;
6578 info.spare_disks = spare;
6580 info.layout = mddev->layout;
6581 info.chunk_size = mddev->chunk_sectors << 9;
6583 if (copy_to_user(arg, &info, sizeof(info)))
6589 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6591 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6595 file = kzalloc(sizeof(*file), GFP_NOIO);
6600 spin_lock(&mddev->lock);
6601 /* bitmap enabled */
6602 if (mddev->bitmap_info.file) {
6603 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6604 sizeof(file->pathname));
6608 memmove(file->pathname, ptr,
6609 sizeof(file->pathname)-(ptr-file->pathname));
6611 spin_unlock(&mddev->lock);
6614 copy_to_user(arg, file, sizeof(*file)))
6621 static int get_disk_info(struct mddev *mddev, void __user * arg)
6623 mdu_disk_info_t info;
6624 struct md_rdev *rdev;
6626 if (copy_from_user(&info, arg, sizeof(info)))
6630 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6632 info.major = MAJOR(rdev->bdev->bd_dev);
6633 info.minor = MINOR(rdev->bdev->bd_dev);
6634 info.raid_disk = rdev->raid_disk;
6636 if (test_bit(Faulty, &rdev->flags))
6637 info.state |= (1<<MD_DISK_FAULTY);
6638 else if (test_bit(In_sync, &rdev->flags)) {
6639 info.state |= (1<<MD_DISK_ACTIVE);
6640 info.state |= (1<<MD_DISK_SYNC);
6642 if (test_bit(Journal, &rdev->flags))
6643 info.state |= (1<<MD_DISK_JOURNAL);
6644 if (test_bit(WriteMostly, &rdev->flags))
6645 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6646 if (test_bit(FailFast, &rdev->flags))
6647 info.state |= (1<<MD_DISK_FAILFAST);
6649 info.major = info.minor = 0;
6650 info.raid_disk = -1;
6651 info.state = (1<<MD_DISK_REMOVED);
6655 if (copy_to_user(arg, &info, sizeof(info)))
6661 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6663 struct md_rdev *rdev;
6664 dev_t dev = MKDEV(info->major,info->minor);
6666 if (mddev_is_clustered(mddev) &&
6667 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6668 pr_warn("%s: Cannot add to clustered mddev.\n",
6673 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6676 if (!mddev->raid_disks) {
6678 /* expecting a device which has a superblock */
6679 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6681 pr_warn("md: md_import_device returned %ld\n",
6683 return PTR_ERR(rdev);
6685 if (!list_empty(&mddev->disks)) {
6686 struct md_rdev *rdev0
6687 = list_entry(mddev->disks.next,
6688 struct md_rdev, same_set);
6689 err = super_types[mddev->major_version]
6690 .load_super(rdev, rdev0, mddev->minor_version);
6692 pr_warn("md: %pg has different UUID to %pg\n",
6695 export_rdev(rdev, mddev);
6699 err = bind_rdev_to_array(rdev, mddev);
6701 export_rdev(rdev, mddev);
6706 * md_add_new_disk can be used once the array is assembled
6707 * to add "hot spares". They must already have a superblock
6712 if (!mddev->pers->hot_add_disk) {
6713 pr_warn("%s: personality does not support diskops!\n",
6717 if (mddev->persistent)
6718 rdev = md_import_device(dev, mddev->major_version,
6719 mddev->minor_version);
6721 rdev = md_import_device(dev, -1, -1);
6723 pr_warn("md: md_import_device returned %ld\n",
6725 return PTR_ERR(rdev);
6727 /* set saved_raid_disk if appropriate */
6728 if (!mddev->persistent) {
6729 if (info->state & (1<<MD_DISK_SYNC) &&
6730 info->raid_disk < mddev->raid_disks) {
6731 rdev->raid_disk = info->raid_disk;
6732 set_bit(In_sync, &rdev->flags);
6733 clear_bit(Bitmap_sync, &rdev->flags);
6735 rdev->raid_disk = -1;
6736 rdev->saved_raid_disk = rdev->raid_disk;
6738 super_types[mddev->major_version].
6739 validate_super(mddev, rdev);
6740 if ((info->state & (1<<MD_DISK_SYNC)) &&
6741 rdev->raid_disk != info->raid_disk) {
6742 /* This was a hot-add request, but events doesn't
6743 * match, so reject it.
6745 export_rdev(rdev, mddev);
6749 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6750 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6751 set_bit(WriteMostly, &rdev->flags);
6753 clear_bit(WriteMostly, &rdev->flags);
6754 if (info->state & (1<<MD_DISK_FAILFAST))
6755 set_bit(FailFast, &rdev->flags);
6757 clear_bit(FailFast, &rdev->flags);
6759 if (info->state & (1<<MD_DISK_JOURNAL)) {
6760 struct md_rdev *rdev2;
6761 bool has_journal = false;
6763 /* make sure no existing journal disk */
6764 rdev_for_each(rdev2, mddev) {
6765 if (test_bit(Journal, &rdev2->flags)) {
6770 if (has_journal || mddev->bitmap) {
6771 export_rdev(rdev, mddev);
6774 set_bit(Journal, &rdev->flags);
6777 * check whether the device shows up in other nodes
6779 if (mddev_is_clustered(mddev)) {
6780 if (info->state & (1 << MD_DISK_CANDIDATE))
6781 set_bit(Candidate, &rdev->flags);
6782 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6783 /* --add initiated by this node */
6784 err = md_cluster_ops->add_new_disk(mddev, rdev);
6786 export_rdev(rdev, mddev);
6792 rdev->raid_disk = -1;
6793 err = bind_rdev_to_array(rdev, mddev);
6796 export_rdev(rdev, mddev);
6798 if (mddev_is_clustered(mddev)) {
6799 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6801 err = md_cluster_ops->new_disk_ack(mddev,
6804 md_kick_rdev_from_array(rdev);
6808 md_cluster_ops->add_new_disk_cancel(mddev);
6810 err = add_bound_rdev(rdev);
6814 err = add_bound_rdev(rdev);
6819 /* otherwise, md_add_new_disk is only allowed
6820 * for major_version==0 superblocks
6822 if (mddev->major_version != 0) {
6823 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6827 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6829 rdev = md_import_device(dev, -1, 0);
6831 pr_warn("md: error, md_import_device() returned %ld\n",
6833 return PTR_ERR(rdev);
6835 rdev->desc_nr = info->number;
6836 if (info->raid_disk < mddev->raid_disks)
6837 rdev->raid_disk = info->raid_disk;
6839 rdev->raid_disk = -1;
6841 if (rdev->raid_disk < mddev->raid_disks)
6842 if (info->state & (1<<MD_DISK_SYNC))
6843 set_bit(In_sync, &rdev->flags);
6845 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6846 set_bit(WriteMostly, &rdev->flags);
6847 if (info->state & (1<<MD_DISK_FAILFAST))
6848 set_bit(FailFast, &rdev->flags);
6850 if (!mddev->persistent) {
6851 pr_debug("md: nonpersistent superblock ...\n");
6852 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6854 rdev->sb_start = calc_dev_sboffset(rdev);
6855 rdev->sectors = rdev->sb_start;
6857 err = bind_rdev_to_array(rdev, mddev);
6859 export_rdev(rdev, mddev);
6867 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6869 struct md_rdev *rdev;
6874 rdev = find_rdev(mddev, dev);
6878 if (rdev->raid_disk < 0)
6881 clear_bit(Blocked, &rdev->flags);
6882 remove_and_add_spares(mddev, rdev);
6884 if (rdev->raid_disk >= 0)
6888 if (mddev_is_clustered(mddev)) {
6889 if (md_cluster_ops->remove_disk(mddev, rdev))
6893 md_kick_rdev_from_array(rdev);
6894 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6896 md_wakeup_thread(mddev->thread);
6898 md_update_sb(mddev, 1);
6903 pr_debug("md: cannot remove active disk %pg from %s ...\n",
6904 rdev->bdev, mdname(mddev));
6908 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6911 struct md_rdev *rdev;
6916 if (mddev->major_version != 0) {
6917 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6921 if (!mddev->pers->hot_add_disk) {
6922 pr_warn("%s: personality does not support diskops!\n",
6927 rdev = md_import_device(dev, -1, 0);
6929 pr_warn("md: error, md_import_device() returned %ld\n",
6934 if (mddev->persistent)
6935 rdev->sb_start = calc_dev_sboffset(rdev);
6937 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6939 rdev->sectors = rdev->sb_start;
6941 if (test_bit(Faulty, &rdev->flags)) {
6942 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
6943 rdev->bdev, mdname(mddev));
6948 clear_bit(In_sync, &rdev->flags);
6950 rdev->saved_raid_disk = -1;
6951 err = bind_rdev_to_array(rdev, mddev);
6956 * The rest should better be atomic, we can have disk failures
6957 * noticed in interrupt contexts ...
6960 rdev->raid_disk = -1;
6962 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6964 md_update_sb(mddev, 1);
6966 * If the new disk does not support REQ_NOWAIT,
6967 * disable on the whole MD.
6969 if (!bdev_nowait(rdev->bdev)) {
6970 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
6971 mdname(mddev), rdev->bdev);
6972 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
6975 * Kick recovery, maybe this spare has to be added to the
6976 * array immediately.
6978 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6979 md_wakeup_thread(mddev->thread);
6984 export_rdev(rdev, mddev);
6988 static int set_bitmap_file(struct mddev *mddev, int fd)
6993 if (!mddev->pers->quiesce || !mddev->thread)
6995 if (mddev->recovery || mddev->sync_thread)
6997 /* we should be able to change the bitmap.. */
7001 struct inode *inode;
7004 if (mddev->bitmap || mddev->bitmap_info.file)
7005 return -EEXIST; /* cannot add when bitmap is present */
7009 pr_warn("%s: error: failed to get bitmap file\n",
7014 inode = f->f_mapping->host;
7015 if (!S_ISREG(inode->i_mode)) {
7016 pr_warn("%s: error: bitmap file must be a regular file\n",
7019 } else if (!(f->f_mode & FMODE_WRITE)) {
7020 pr_warn("%s: error: bitmap file must open for write\n",
7023 } else if (atomic_read(&inode->i_writecount) != 1) {
7024 pr_warn("%s: error: bitmap file is already in use\n",
7032 mddev->bitmap_info.file = f;
7033 mddev->bitmap_info.offset = 0; /* file overrides offset */
7034 } else if (mddev->bitmap == NULL)
7035 return -ENOENT; /* cannot remove what isn't there */
7039 struct bitmap *bitmap;
7041 bitmap = md_bitmap_create(mddev, -1);
7042 mddev_suspend(mddev);
7043 if (!IS_ERR(bitmap)) {
7044 mddev->bitmap = bitmap;
7045 err = md_bitmap_load(mddev);
7047 err = PTR_ERR(bitmap);
7049 md_bitmap_destroy(mddev);
7052 mddev_resume(mddev);
7053 } else if (fd < 0) {
7054 mddev_suspend(mddev);
7055 md_bitmap_destroy(mddev);
7056 mddev_resume(mddev);
7060 struct file *f = mddev->bitmap_info.file;
7062 spin_lock(&mddev->lock);
7063 mddev->bitmap_info.file = NULL;
7064 spin_unlock(&mddev->lock);
7073 * md_set_array_info is used two different ways
7074 * The original usage is when creating a new array.
7075 * In this usage, raid_disks is > 0 and it together with
7076 * level, size, not_persistent,layout,chunksize determine the
7077 * shape of the array.
7078 * This will always create an array with a type-0.90.0 superblock.
7079 * The newer usage is when assembling an array.
7080 * In this case raid_disks will be 0, and the major_version field is
7081 * use to determine which style super-blocks are to be found on the devices.
7082 * The minor and patch _version numbers are also kept incase the
7083 * super_block handler wishes to interpret them.
7085 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7087 if (info->raid_disks == 0) {
7088 /* just setting version number for superblock loading */
7089 if (info->major_version < 0 ||
7090 info->major_version >= ARRAY_SIZE(super_types) ||
7091 super_types[info->major_version].name == NULL) {
7092 /* maybe try to auto-load a module? */
7093 pr_warn("md: superblock version %d not known\n",
7094 info->major_version);
7097 mddev->major_version = info->major_version;
7098 mddev->minor_version = info->minor_version;
7099 mddev->patch_version = info->patch_version;
7100 mddev->persistent = !info->not_persistent;
7101 /* ensure mddev_put doesn't delete this now that there
7102 * is some minimal configuration.
7104 mddev->ctime = ktime_get_real_seconds();
7107 mddev->major_version = MD_MAJOR_VERSION;
7108 mddev->minor_version = MD_MINOR_VERSION;
7109 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7110 mddev->ctime = ktime_get_real_seconds();
7112 mddev->level = info->level;
7113 mddev->clevel[0] = 0;
7114 mddev->dev_sectors = 2 * (sector_t)info->size;
7115 mddev->raid_disks = info->raid_disks;
7116 /* don't set md_minor, it is determined by which /dev/md* was
7119 if (info->state & (1<<MD_SB_CLEAN))
7120 mddev->recovery_cp = MaxSector;
7122 mddev->recovery_cp = 0;
7123 mddev->persistent = ! info->not_persistent;
7124 mddev->external = 0;
7126 mddev->layout = info->layout;
7127 if (mddev->level == 0)
7128 /* Cannot trust RAID0 layout info here */
7130 mddev->chunk_sectors = info->chunk_size >> 9;
7132 if (mddev->persistent) {
7133 mddev->max_disks = MD_SB_DISKS;
7135 mddev->sb_flags = 0;
7137 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7139 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7140 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7141 mddev->bitmap_info.offset = 0;
7143 mddev->reshape_position = MaxSector;
7146 * Generate a 128 bit UUID
7148 get_random_bytes(mddev->uuid, 16);
7150 mddev->new_level = mddev->level;
7151 mddev->new_chunk_sectors = mddev->chunk_sectors;
7152 mddev->new_layout = mddev->layout;
7153 mddev->delta_disks = 0;
7154 mddev->reshape_backwards = 0;
7159 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7161 lockdep_assert_held(&mddev->reconfig_mutex);
7163 if (mddev->external_size)
7166 mddev->array_sectors = array_sectors;
7168 EXPORT_SYMBOL(md_set_array_sectors);
7170 static int update_size(struct mddev *mddev, sector_t num_sectors)
7172 struct md_rdev *rdev;
7174 int fit = (num_sectors == 0);
7175 sector_t old_dev_sectors = mddev->dev_sectors;
7177 if (mddev->pers->resize == NULL)
7179 /* The "num_sectors" is the number of sectors of each device that
7180 * is used. This can only make sense for arrays with redundancy.
7181 * linear and raid0 always use whatever space is available. We can only
7182 * consider changing this number if no resync or reconstruction is
7183 * happening, and if the new size is acceptable. It must fit before the
7184 * sb_start or, if that is <data_offset, it must fit before the size
7185 * of each device. If num_sectors is zero, we find the largest size
7188 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7191 if (!md_is_rdwr(mddev))
7194 rdev_for_each(rdev, mddev) {
7195 sector_t avail = rdev->sectors;
7197 if (fit && (num_sectors == 0 || num_sectors > avail))
7198 num_sectors = avail;
7199 if (avail < num_sectors)
7202 rv = mddev->pers->resize(mddev, num_sectors);
7204 if (mddev_is_clustered(mddev))
7205 md_cluster_ops->update_size(mddev, old_dev_sectors);
7206 else if (mddev->queue) {
7207 set_capacity_and_notify(mddev->gendisk,
7208 mddev->array_sectors);
7214 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7217 struct md_rdev *rdev;
7218 /* change the number of raid disks */
7219 if (mddev->pers->check_reshape == NULL)
7221 if (!md_is_rdwr(mddev))
7223 if (raid_disks <= 0 ||
7224 (mddev->max_disks && raid_disks >= mddev->max_disks))
7226 if (mddev->sync_thread ||
7227 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7228 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7229 mddev->reshape_position != MaxSector)
7232 rdev_for_each(rdev, mddev) {
7233 if (mddev->raid_disks < raid_disks &&
7234 rdev->data_offset < rdev->new_data_offset)
7236 if (mddev->raid_disks > raid_disks &&
7237 rdev->data_offset > rdev->new_data_offset)
7241 mddev->delta_disks = raid_disks - mddev->raid_disks;
7242 if (mddev->delta_disks < 0)
7243 mddev->reshape_backwards = 1;
7244 else if (mddev->delta_disks > 0)
7245 mddev->reshape_backwards = 0;
7247 rv = mddev->pers->check_reshape(mddev);
7249 mddev->delta_disks = 0;
7250 mddev->reshape_backwards = 0;
7256 * update_array_info is used to change the configuration of an
7258 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7259 * fields in the info are checked against the array.
7260 * Any differences that cannot be handled will cause an error.
7261 * Normally, only one change can be managed at a time.
7263 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7269 /* calculate expected state,ignoring low bits */
7270 if (mddev->bitmap && mddev->bitmap_info.offset)
7271 state |= (1 << MD_SB_BITMAP_PRESENT);
7273 if (mddev->major_version != info->major_version ||
7274 mddev->minor_version != info->minor_version ||
7275 /* mddev->patch_version != info->patch_version || */
7276 mddev->ctime != info->ctime ||
7277 mddev->level != info->level ||
7278 /* mddev->layout != info->layout || */
7279 mddev->persistent != !info->not_persistent ||
7280 mddev->chunk_sectors != info->chunk_size >> 9 ||
7281 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7282 ((state^info->state) & 0xfffffe00)
7285 /* Check there is only one change */
7286 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7288 if (mddev->raid_disks != info->raid_disks)
7290 if (mddev->layout != info->layout)
7292 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7299 if (mddev->layout != info->layout) {
7301 * we don't need to do anything at the md level, the
7302 * personality will take care of it all.
7304 if (mddev->pers->check_reshape == NULL)
7307 mddev->new_layout = info->layout;
7308 rv = mddev->pers->check_reshape(mddev);
7310 mddev->new_layout = mddev->layout;
7314 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7315 rv = update_size(mddev, (sector_t)info->size * 2);
7317 if (mddev->raid_disks != info->raid_disks)
7318 rv = update_raid_disks(mddev, info->raid_disks);
7320 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7321 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7325 if (mddev->recovery || mddev->sync_thread) {
7329 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7330 struct bitmap *bitmap;
7331 /* add the bitmap */
7332 if (mddev->bitmap) {
7336 if (mddev->bitmap_info.default_offset == 0) {
7340 mddev->bitmap_info.offset =
7341 mddev->bitmap_info.default_offset;
7342 mddev->bitmap_info.space =
7343 mddev->bitmap_info.default_space;
7344 bitmap = md_bitmap_create(mddev, -1);
7345 mddev_suspend(mddev);
7346 if (!IS_ERR(bitmap)) {
7347 mddev->bitmap = bitmap;
7348 rv = md_bitmap_load(mddev);
7350 rv = PTR_ERR(bitmap);
7352 md_bitmap_destroy(mddev);
7353 mddev_resume(mddev);
7355 /* remove the bitmap */
7356 if (!mddev->bitmap) {
7360 if (mddev->bitmap->storage.file) {
7364 if (mddev->bitmap_info.nodes) {
7365 /* hold PW on all the bitmap lock */
7366 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7367 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7369 md_cluster_ops->unlock_all_bitmaps(mddev);
7373 mddev->bitmap_info.nodes = 0;
7374 md_cluster_ops->leave(mddev);
7375 module_put(md_cluster_mod);
7376 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7378 mddev_suspend(mddev);
7379 md_bitmap_destroy(mddev);
7380 mddev_resume(mddev);
7381 mddev->bitmap_info.offset = 0;
7384 md_update_sb(mddev, 1);
7390 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7392 struct md_rdev *rdev;
7395 if (mddev->pers == NULL)
7399 rdev = md_find_rdev_rcu(mddev, dev);
7403 md_error(mddev, rdev);
7404 if (test_bit(MD_BROKEN, &mddev->flags))
7412 * We have a problem here : there is no easy way to give a CHS
7413 * virtual geometry. We currently pretend that we have a 2 heads
7414 * 4 sectors (with a BIG number of cylinders...). This drives
7415 * dosfs just mad... ;-)
7417 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7419 struct mddev *mddev = bdev->bd_disk->private_data;
7423 geo->cylinders = mddev->array_sectors / 8;
7427 static inline bool md_ioctl_valid(unsigned int cmd)
7431 case GET_ARRAY_INFO:
7432 case GET_BITMAP_FILE:
7435 case HOT_REMOVE_DISK:
7437 case RESTART_ARRAY_RW:
7439 case SET_ARRAY_INFO:
7440 case SET_BITMAP_FILE:
7441 case SET_DISK_FAULTY:
7444 case CLUSTERED_DISK_NACK:
7451 static int __md_set_array_info(struct mddev *mddev, void __user *argp)
7453 mdu_array_info_t info;
7457 memset(&info, 0, sizeof(info));
7458 else if (copy_from_user(&info, argp, sizeof(info)))
7462 err = update_array_info(mddev, &info);
7464 pr_warn("md: couldn't update array info. %d\n", err);
7468 if (!list_empty(&mddev->disks)) {
7469 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7473 if (mddev->raid_disks) {
7474 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7478 err = md_set_array_info(mddev, &info);
7480 pr_warn("md: couldn't set array info. %d\n", err);
7485 static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
7486 unsigned int cmd, unsigned long arg)
7489 void __user *argp = (void __user *)arg;
7490 struct mddev *mddev = NULL;
7491 bool did_set_md_closing = false;
7493 if (!md_ioctl_valid(cmd))
7498 case GET_ARRAY_INFO:
7502 if (!capable(CAP_SYS_ADMIN))
7507 * Commands dealing with the RAID driver but not any
7512 err = get_version(argp);
7518 * Commands creating/starting a new array:
7521 mddev = bdev->bd_disk->private_data;
7528 /* Some actions do not requires the mutex */
7530 case GET_ARRAY_INFO:
7531 if (!mddev->raid_disks && !mddev->external)
7534 err = get_array_info(mddev, argp);
7538 if (!mddev->raid_disks && !mddev->external)
7541 err = get_disk_info(mddev, argp);
7544 case SET_DISK_FAULTY:
7545 err = set_disk_faulty(mddev, new_decode_dev(arg));
7548 case GET_BITMAP_FILE:
7549 err = get_bitmap_file(mddev, argp);
7554 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7555 flush_rdev_wq(mddev);
7557 if (cmd == HOT_REMOVE_DISK)
7558 /* need to ensure recovery thread has run */
7559 wait_event_interruptible_timeout(mddev->sb_wait,
7560 !test_bit(MD_RECOVERY_NEEDED,
7562 msecs_to_jiffies(5000));
7563 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7564 /* Need to flush page cache, and ensure no-one else opens
7567 mutex_lock(&mddev->open_mutex);
7568 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7569 mutex_unlock(&mddev->open_mutex);
7573 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7574 mutex_unlock(&mddev->open_mutex);
7578 did_set_md_closing = true;
7579 mutex_unlock(&mddev->open_mutex);
7580 sync_blockdev(bdev);
7582 err = mddev_lock(mddev);
7584 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7589 if (cmd == SET_ARRAY_INFO) {
7590 err = __md_set_array_info(mddev, argp);
7595 * Commands querying/configuring an existing array:
7597 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7598 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7599 if ((!mddev->raid_disks && !mddev->external)
7600 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7601 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7602 && cmd != GET_BITMAP_FILE) {
7608 * Commands even a read-only array can execute:
7611 case RESTART_ARRAY_RW:
7612 err = restart_array(mddev);
7616 err = do_md_stop(mddev, 0, bdev);
7620 err = md_set_readonly(mddev, bdev);
7623 case HOT_REMOVE_DISK:
7624 err = hot_remove_disk(mddev, new_decode_dev(arg));
7628 /* We can support ADD_NEW_DISK on read-only arrays
7629 * only if we are re-adding a preexisting device.
7630 * So require mddev->pers and MD_DISK_SYNC.
7633 mdu_disk_info_t info;
7634 if (copy_from_user(&info, argp, sizeof(info)))
7636 else if (!(info.state & (1<<MD_DISK_SYNC)))
7637 /* Need to clear read-only for this */
7640 err = md_add_new_disk(mddev, &info);
7647 * The remaining ioctls are changing the state of the
7648 * superblock, so we do not allow them on read-only arrays.
7650 if (!md_is_rdwr(mddev) && mddev->pers) {
7651 if (mddev->ro != MD_AUTO_READ) {
7655 mddev->ro = MD_RDWR;
7656 sysfs_notify_dirent_safe(mddev->sysfs_state);
7657 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7658 /* mddev_unlock will wake thread */
7659 /* If a device failed while we were read-only, we
7660 * need to make sure the metadata is updated now.
7662 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7663 mddev_unlock(mddev);
7664 wait_event(mddev->sb_wait,
7665 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7666 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7667 mddev_lock_nointr(mddev);
7674 mdu_disk_info_t info;
7675 if (copy_from_user(&info, argp, sizeof(info)))
7678 err = md_add_new_disk(mddev, &info);
7682 case CLUSTERED_DISK_NACK:
7683 if (mddev_is_clustered(mddev))
7684 md_cluster_ops->new_disk_ack(mddev, false);
7690 err = hot_add_disk(mddev, new_decode_dev(arg));
7694 err = do_md_run(mddev);
7697 case SET_BITMAP_FILE:
7698 err = set_bitmap_file(mddev, (int)arg);
7707 if (mddev->hold_active == UNTIL_IOCTL &&
7709 mddev->hold_active = 0;
7710 mddev_unlock(mddev);
7712 if(did_set_md_closing)
7713 clear_bit(MD_CLOSING, &mddev->flags);
7716 #ifdef CONFIG_COMPAT
7717 static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
7718 unsigned int cmd, unsigned long arg)
7721 case HOT_REMOVE_DISK:
7723 case SET_DISK_FAULTY:
7724 case SET_BITMAP_FILE:
7725 /* These take in integer arg, do not convert */
7728 arg = (unsigned long)compat_ptr(arg);
7732 return md_ioctl(bdev, mode, cmd, arg);
7734 #endif /* CONFIG_COMPAT */
7736 static int md_set_read_only(struct block_device *bdev, bool ro)
7738 struct mddev *mddev = bdev->bd_disk->private_data;
7741 err = mddev_lock(mddev);
7745 if (!mddev->raid_disks && !mddev->external) {
7751 * Transitioning to read-auto need only happen for arrays that call
7752 * md_write_start and which are not ready for writes yet.
7754 if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
7755 err = restart_array(mddev);
7758 mddev->ro = MD_AUTO_READ;
7762 mddev_unlock(mddev);
7766 static int md_open(struct gendisk *disk, blk_mode_t mode)
7768 struct mddev *mddev;
7771 spin_lock(&all_mddevs_lock);
7772 mddev = mddev_get(disk->private_data);
7773 spin_unlock(&all_mddevs_lock);
7777 err = mutex_lock_interruptible(&mddev->open_mutex);
7782 if (test_bit(MD_CLOSING, &mddev->flags))
7785 atomic_inc(&mddev->openers);
7786 mutex_unlock(&mddev->open_mutex);
7788 disk_check_media_change(disk);
7792 mutex_unlock(&mddev->open_mutex);
7798 static void md_release(struct gendisk *disk)
7800 struct mddev *mddev = disk->private_data;
7803 atomic_dec(&mddev->openers);
7807 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7809 struct mddev *mddev = disk->private_data;
7810 unsigned int ret = 0;
7813 ret = DISK_EVENT_MEDIA_CHANGE;
7818 static void md_free_disk(struct gendisk *disk)
7820 struct mddev *mddev = disk->private_data;
7822 percpu_ref_exit(&mddev->writes_pending);
7826 const struct block_device_operations md_fops =
7828 .owner = THIS_MODULE,
7829 .submit_bio = md_submit_bio,
7831 .release = md_release,
7833 #ifdef CONFIG_COMPAT
7834 .compat_ioctl = md_compat_ioctl,
7836 .getgeo = md_getgeo,
7837 .check_events = md_check_events,
7838 .set_read_only = md_set_read_only,
7839 .free_disk = md_free_disk,
7842 static int md_thread(void *arg)
7844 struct md_thread *thread = arg;
7847 * md_thread is a 'system-thread', it's priority should be very
7848 * high. We avoid resource deadlocks individually in each
7849 * raid personality. (RAID5 does preallocation) We also use RR and
7850 * the very same RT priority as kswapd, thus we will never get
7851 * into a priority inversion deadlock.
7853 * we definitely have to have equal or higher priority than
7854 * bdflush, otherwise bdflush will deadlock if there are too
7855 * many dirty RAID5 blocks.
7858 allow_signal(SIGKILL);
7859 while (!kthread_should_stop()) {
7861 /* We need to wait INTERRUPTIBLE so that
7862 * we don't add to the load-average.
7863 * That means we need to be sure no signals are
7866 if (signal_pending(current))
7867 flush_signals(current);
7869 wait_event_interruptible_timeout
7871 test_bit(THREAD_WAKEUP, &thread->flags)
7872 || kthread_should_stop() || kthread_should_park(),
7875 clear_bit(THREAD_WAKEUP, &thread->flags);
7876 if (kthread_should_park())
7878 if (!kthread_should_stop())
7879 thread->run(thread);
7885 void md_wakeup_thread(struct md_thread *thread)
7888 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7889 set_bit(THREAD_WAKEUP, &thread->flags);
7890 wake_up(&thread->wqueue);
7893 EXPORT_SYMBOL(md_wakeup_thread);
7895 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7896 struct mddev *mddev, const char *name)
7898 struct md_thread *thread;
7900 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7904 init_waitqueue_head(&thread->wqueue);
7907 thread->mddev = mddev;
7908 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7909 thread->tsk = kthread_run(md_thread, thread,
7911 mdname(thread->mddev),
7913 if (IS_ERR(thread->tsk)) {
7919 EXPORT_SYMBOL(md_register_thread);
7921 void md_unregister_thread(struct md_thread **threadp)
7923 struct md_thread *thread;
7926 * Locking ensures that mddev_unlock does not wake_up a
7927 * non-existent thread
7929 spin_lock(&pers_lock);
7932 spin_unlock(&pers_lock);
7936 spin_unlock(&pers_lock);
7938 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7939 kthread_stop(thread->tsk);
7942 EXPORT_SYMBOL(md_unregister_thread);
7944 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7946 if (!rdev || test_bit(Faulty, &rdev->flags))
7949 if (!mddev->pers || !mddev->pers->error_handler)
7951 mddev->pers->error_handler(mddev, rdev);
7953 if (mddev->pers->level == 0 || mddev->pers->level == LEVEL_LINEAR)
7956 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
7957 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7958 sysfs_notify_dirent_safe(rdev->sysfs_state);
7959 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7960 if (!test_bit(MD_BROKEN, &mddev->flags)) {
7961 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7962 md_wakeup_thread(mddev->thread);
7964 if (mddev->event_work.func)
7965 queue_work(md_misc_wq, &mddev->event_work);
7968 EXPORT_SYMBOL(md_error);
7970 /* seq_file implementation /proc/mdstat */
7972 static void status_unused(struct seq_file *seq)
7975 struct md_rdev *rdev;
7977 seq_printf(seq, "unused devices: ");
7979 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7981 seq_printf(seq, "%pg ", rdev->bdev);
7984 seq_printf(seq, "<none>");
7986 seq_printf(seq, "\n");
7989 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7991 sector_t max_sectors, resync, res;
7992 unsigned long dt, db = 0;
7993 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7994 int scale, recovery_active;
7995 unsigned int per_milli;
7997 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7998 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7999 max_sectors = mddev->resync_max_sectors;
8001 max_sectors = mddev->dev_sectors;
8003 resync = mddev->curr_resync;
8004 if (resync < MD_RESYNC_ACTIVE) {
8005 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8006 /* Still cleaning up */
8007 resync = max_sectors;
8008 } else if (resync > max_sectors) {
8009 resync = max_sectors;
8011 res = atomic_read(&mddev->recovery_active);
8013 * Resync has started, but the subtraction has overflowed or
8014 * yielded one of the special values. Force it to active to
8015 * ensure the status reports an active resync.
8017 if (resync < res || resync - res < MD_RESYNC_ACTIVE)
8018 resync = MD_RESYNC_ACTIVE;
8023 if (resync == MD_RESYNC_NONE) {
8024 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8025 struct md_rdev *rdev;
8027 rdev_for_each(rdev, mddev)
8028 if (rdev->raid_disk >= 0 &&
8029 !test_bit(Faulty, &rdev->flags) &&
8030 rdev->recovery_offset != MaxSector &&
8031 rdev->recovery_offset) {
8032 seq_printf(seq, "\trecover=REMOTE");
8035 if (mddev->reshape_position != MaxSector)
8036 seq_printf(seq, "\treshape=REMOTE");
8038 seq_printf(seq, "\tresync=REMOTE");
8041 if (mddev->recovery_cp < MaxSector) {
8042 seq_printf(seq, "\tresync=PENDING");
8047 if (resync < MD_RESYNC_ACTIVE) {
8048 seq_printf(seq, "\tresync=DELAYED");
8052 WARN_ON(max_sectors == 0);
8053 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8054 * in a sector_t, and (max_sectors>>scale) will fit in a
8055 * u32, as those are the requirements for sector_div.
8056 * Thus 'scale' must be at least 10
8059 if (sizeof(sector_t) > sizeof(unsigned long)) {
8060 while ( max_sectors/2 > (1ULL<<(scale+32)))
8063 res = (resync>>scale)*1000;
8064 sector_div(res, (u32)((max_sectors>>scale)+1));
8068 int i, x = per_milli/50, y = 20-x;
8069 seq_printf(seq, "[");
8070 for (i = 0; i < x; i++)
8071 seq_printf(seq, "=");
8072 seq_printf(seq, ">");
8073 for (i = 0; i < y; i++)
8074 seq_printf(seq, ".");
8075 seq_printf(seq, "] ");
8077 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8078 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8080 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8082 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8083 "resync" : "recovery"))),
8084 per_milli/10, per_milli % 10,
8085 (unsigned long long) resync/2,
8086 (unsigned long long) max_sectors/2);
8089 * dt: time from mark until now
8090 * db: blocks written from mark until now
8091 * rt: remaining time
8093 * rt is a sector_t, which is always 64bit now. We are keeping
8094 * the original algorithm, but it is not really necessary.
8096 * Original algorithm:
8097 * So we divide before multiply in case it is 32bit and close
8099 * We scale the divisor (db) by 32 to avoid losing precision
8100 * near the end of resync when the number of remaining sectors
8102 * We then divide rt by 32 after multiplying by db to compensate.
8103 * The '+1' avoids division by zero if db is very small.
8105 dt = ((jiffies - mddev->resync_mark) / HZ);
8108 curr_mark_cnt = mddev->curr_mark_cnt;
8109 recovery_active = atomic_read(&mddev->recovery_active);
8110 resync_mark_cnt = mddev->resync_mark_cnt;
8112 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8113 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8115 rt = max_sectors - resync; /* number of remaining sectors */
8116 rt = div64_u64(rt, db/32+1);
8120 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8121 ((unsigned long)rt % 60)/6);
8123 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8127 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8129 struct list_head *tmp;
8131 struct mddev *mddev;
8143 spin_lock(&all_mddevs_lock);
8144 list_for_each(tmp,&all_mddevs)
8146 mddev = list_entry(tmp, struct mddev, all_mddevs);
8147 if (!mddev_get(mddev))
8149 spin_unlock(&all_mddevs_lock);
8152 spin_unlock(&all_mddevs_lock);
8154 return (void*)2;/* tail */
8158 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8160 struct list_head *tmp;
8161 struct mddev *next_mddev, *mddev = v;
8162 struct mddev *to_put = NULL;
8168 spin_lock(&all_mddevs_lock);
8169 if (v == (void*)1) {
8170 tmp = all_mddevs.next;
8173 tmp = mddev->all_mddevs.next;
8177 if (tmp == &all_mddevs) {
8178 next_mddev = (void*)2;
8182 next_mddev = list_entry(tmp, struct mddev, all_mddevs);
8183 if (mddev_get(next_mddev))
8186 tmp = mddev->all_mddevs.next;
8188 spin_unlock(&all_mddevs_lock);
8196 static void md_seq_stop(struct seq_file *seq, void *v)
8198 struct mddev *mddev = v;
8200 if (mddev && v != (void*)1 && v != (void*)2)
8204 static int md_seq_show(struct seq_file *seq, void *v)
8206 struct mddev *mddev = v;
8208 struct md_rdev *rdev;
8210 if (v == (void*)1) {
8211 struct md_personality *pers;
8212 seq_printf(seq, "Personalities : ");
8213 spin_lock(&pers_lock);
8214 list_for_each_entry(pers, &pers_list, list)
8215 seq_printf(seq, "[%s] ", pers->name);
8217 spin_unlock(&pers_lock);
8218 seq_printf(seq, "\n");
8219 seq->poll_event = atomic_read(&md_event_count);
8222 if (v == (void*)2) {
8227 spin_lock(&mddev->lock);
8228 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8229 seq_printf(seq, "%s : %sactive", mdname(mddev),
8230 mddev->pers ? "" : "in");
8232 if (mddev->ro == MD_RDONLY)
8233 seq_printf(seq, " (read-only)");
8234 if (mddev->ro == MD_AUTO_READ)
8235 seq_printf(seq, " (auto-read-only)");
8236 seq_printf(seq, " %s", mddev->pers->name);
8241 rdev_for_each_rcu(rdev, mddev) {
8242 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8244 if (test_bit(WriteMostly, &rdev->flags))
8245 seq_printf(seq, "(W)");
8246 if (test_bit(Journal, &rdev->flags))
8247 seq_printf(seq, "(J)");
8248 if (test_bit(Faulty, &rdev->flags)) {
8249 seq_printf(seq, "(F)");
8252 if (rdev->raid_disk < 0)
8253 seq_printf(seq, "(S)"); /* spare */
8254 if (test_bit(Replacement, &rdev->flags))
8255 seq_printf(seq, "(R)");
8256 sectors += rdev->sectors;
8260 if (!list_empty(&mddev->disks)) {
8262 seq_printf(seq, "\n %llu blocks",
8263 (unsigned long long)
8264 mddev->array_sectors / 2);
8266 seq_printf(seq, "\n %llu blocks",
8267 (unsigned long long)sectors / 2);
8269 if (mddev->persistent) {
8270 if (mddev->major_version != 0 ||
8271 mddev->minor_version != 90) {
8272 seq_printf(seq," super %d.%d",
8273 mddev->major_version,
8274 mddev->minor_version);
8276 } else if (mddev->external)
8277 seq_printf(seq, " super external:%s",
8278 mddev->metadata_type);
8280 seq_printf(seq, " super non-persistent");
8283 mddev->pers->status(seq, mddev);
8284 seq_printf(seq, "\n ");
8285 if (mddev->pers->sync_request) {
8286 if (status_resync(seq, mddev))
8287 seq_printf(seq, "\n ");
8290 seq_printf(seq, "\n ");
8292 md_bitmap_status(seq, mddev->bitmap);
8294 seq_printf(seq, "\n");
8296 spin_unlock(&mddev->lock);
8301 static const struct seq_operations md_seq_ops = {
8302 .start = md_seq_start,
8303 .next = md_seq_next,
8304 .stop = md_seq_stop,
8305 .show = md_seq_show,
8308 static int md_seq_open(struct inode *inode, struct file *file)
8310 struct seq_file *seq;
8313 error = seq_open(file, &md_seq_ops);
8317 seq = file->private_data;
8318 seq->poll_event = atomic_read(&md_event_count);
8322 static int md_unloading;
8323 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8325 struct seq_file *seq = filp->private_data;
8329 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8330 poll_wait(filp, &md_event_waiters, wait);
8332 /* always allow read */
8333 mask = EPOLLIN | EPOLLRDNORM;
8335 if (seq->poll_event != atomic_read(&md_event_count))
8336 mask |= EPOLLERR | EPOLLPRI;
8340 static const struct proc_ops mdstat_proc_ops = {
8341 .proc_open = md_seq_open,
8342 .proc_read = seq_read,
8343 .proc_lseek = seq_lseek,
8344 .proc_release = seq_release,
8345 .proc_poll = mdstat_poll,
8348 int register_md_personality(struct md_personality *p)
8350 pr_debug("md: %s personality registered for level %d\n",
8352 spin_lock(&pers_lock);
8353 list_add_tail(&p->list, &pers_list);
8354 spin_unlock(&pers_lock);
8357 EXPORT_SYMBOL(register_md_personality);
8359 int unregister_md_personality(struct md_personality *p)
8361 pr_debug("md: %s personality unregistered\n", p->name);
8362 spin_lock(&pers_lock);
8363 list_del_init(&p->list);
8364 spin_unlock(&pers_lock);
8367 EXPORT_SYMBOL(unregister_md_personality);
8369 int register_md_cluster_operations(struct md_cluster_operations *ops,
8370 struct module *module)
8373 spin_lock(&pers_lock);
8374 if (md_cluster_ops != NULL)
8377 md_cluster_ops = ops;
8378 md_cluster_mod = module;
8380 spin_unlock(&pers_lock);
8383 EXPORT_SYMBOL(register_md_cluster_operations);
8385 int unregister_md_cluster_operations(void)
8387 spin_lock(&pers_lock);
8388 md_cluster_ops = NULL;
8389 spin_unlock(&pers_lock);
8392 EXPORT_SYMBOL(unregister_md_cluster_operations);
8394 int md_setup_cluster(struct mddev *mddev, int nodes)
8397 if (!md_cluster_ops)
8398 request_module("md-cluster");
8399 spin_lock(&pers_lock);
8400 /* ensure module won't be unloaded */
8401 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8402 pr_warn("can't find md-cluster module or get its reference.\n");
8403 spin_unlock(&pers_lock);
8406 spin_unlock(&pers_lock);
8408 ret = md_cluster_ops->join(mddev, nodes);
8410 mddev->safemode_delay = 0;
8414 void md_cluster_stop(struct mddev *mddev)
8416 if (!md_cluster_ops)
8418 md_cluster_ops->leave(mddev);
8419 module_put(md_cluster_mod);
8422 static int is_mddev_idle(struct mddev *mddev, int init)
8424 struct md_rdev *rdev;
8430 rdev_for_each_rcu(rdev, mddev) {
8431 struct gendisk *disk = rdev->bdev->bd_disk;
8432 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8433 atomic_read(&disk->sync_io);
8434 /* sync IO will cause sync_io to increase before the disk_stats
8435 * as sync_io is counted when a request starts, and
8436 * disk_stats is counted when it completes.
8437 * So resync activity will cause curr_events to be smaller than
8438 * when there was no such activity.
8439 * non-sync IO will cause disk_stat to increase without
8440 * increasing sync_io so curr_events will (eventually)
8441 * be larger than it was before. Once it becomes
8442 * substantially larger, the test below will cause
8443 * the array to appear non-idle, and resync will slow
8445 * If there is a lot of outstanding resync activity when
8446 * we set last_event to curr_events, then all that activity
8447 * completing might cause the array to appear non-idle
8448 * and resync will be slowed down even though there might
8449 * not have been non-resync activity. This will only
8450 * happen once though. 'last_events' will soon reflect
8451 * the state where there is little or no outstanding
8452 * resync requests, and further resync activity will
8453 * always make curr_events less than last_events.
8456 if (init || curr_events - rdev->last_events > 64) {
8457 rdev->last_events = curr_events;
8465 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8467 /* another "blocks" (512byte) blocks have been synced */
8468 atomic_sub(blocks, &mddev->recovery_active);
8469 wake_up(&mddev->recovery_wait);
8471 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8472 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8473 md_wakeup_thread(mddev->thread);
8474 // stop recovery, signal do_sync ....
8477 EXPORT_SYMBOL(md_done_sync);
8479 /* md_write_start(mddev, bi)
8480 * If we need to update some array metadata (e.g. 'active' flag
8481 * in superblock) before writing, schedule a superblock update
8482 * and wait for it to complete.
8483 * A return value of 'false' means that the write wasn't recorded
8484 * and cannot proceed as the array is being suspend.
8486 bool md_write_start(struct mddev *mddev, struct bio *bi)
8490 if (bio_data_dir(bi) != WRITE)
8493 BUG_ON(mddev->ro == MD_RDONLY);
8494 if (mddev->ro == MD_AUTO_READ) {
8495 /* need to switch to read/write */
8496 mddev->ro = MD_RDWR;
8497 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8498 md_wakeup_thread(mddev->thread);
8499 md_wakeup_thread(mddev->sync_thread);
8503 percpu_ref_get(&mddev->writes_pending);
8504 smp_mb(); /* Match smp_mb in set_in_sync() */
8505 if (mddev->safemode == 1)
8506 mddev->safemode = 0;
8507 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8508 if (mddev->in_sync || mddev->sync_checkers) {
8509 spin_lock(&mddev->lock);
8510 if (mddev->in_sync) {
8512 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8513 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8514 md_wakeup_thread(mddev->thread);
8517 spin_unlock(&mddev->lock);
8521 sysfs_notify_dirent_safe(mddev->sysfs_state);
8522 if (!mddev->has_superblocks)
8524 wait_event(mddev->sb_wait,
8525 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8526 is_md_suspended(mddev));
8527 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8528 percpu_ref_put(&mddev->writes_pending);
8533 EXPORT_SYMBOL(md_write_start);
8535 /* md_write_inc can only be called when md_write_start() has
8536 * already been called at least once of the current request.
8537 * It increments the counter and is useful when a single request
8538 * is split into several parts. Each part causes an increment and
8539 * so needs a matching md_write_end().
8540 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8541 * a spinlocked region.
8543 void md_write_inc(struct mddev *mddev, struct bio *bi)
8545 if (bio_data_dir(bi) != WRITE)
8547 WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
8548 percpu_ref_get(&mddev->writes_pending);
8550 EXPORT_SYMBOL(md_write_inc);
8552 void md_write_end(struct mddev *mddev)
8554 percpu_ref_put(&mddev->writes_pending);
8556 if (mddev->safemode == 2)
8557 md_wakeup_thread(mddev->thread);
8558 else if (mddev->safemode_delay)
8559 /* The roundup() ensures this only performs locking once
8560 * every ->safemode_delay jiffies
8562 mod_timer(&mddev->safemode_timer,
8563 roundup(jiffies, mddev->safemode_delay) +
8564 mddev->safemode_delay);
8567 EXPORT_SYMBOL(md_write_end);
8569 /* This is used by raid0 and raid10 */
8570 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8571 struct bio *bio, sector_t start, sector_t size)
8573 struct bio *discard_bio = NULL;
8575 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8576 &discard_bio) || !discard_bio)
8579 bio_chain(discard_bio, bio);
8580 bio_clone_blkg_association(discard_bio, bio);
8582 trace_block_bio_remap(discard_bio,
8583 disk_devt(mddev->gendisk),
8584 bio->bi_iter.bi_sector);
8585 submit_bio_noacct(discard_bio);
8587 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8589 int acct_bioset_init(struct mddev *mddev)
8593 if (!bioset_initialized(&mddev->io_acct_set))
8594 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
8595 offsetof(struct md_io_acct, bio_clone), 0);
8598 EXPORT_SYMBOL_GPL(acct_bioset_init);
8600 void acct_bioset_exit(struct mddev *mddev)
8602 bioset_exit(&mddev->io_acct_set);
8604 EXPORT_SYMBOL_GPL(acct_bioset_exit);
8606 static void md_end_io_acct(struct bio *bio)
8608 struct md_io_acct *md_io_acct = bio->bi_private;
8609 struct bio *orig_bio = md_io_acct->orig_bio;
8610 struct mddev *mddev = md_io_acct->mddev;
8612 orig_bio->bi_status = bio->bi_status;
8614 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8616 bio_endio(orig_bio);
8618 percpu_ref_put(&mddev->active_io);
8622 * Used by personalities that don't already clone the bio and thus can't
8623 * easily add the timestamp to their extended bio structure.
8625 void md_account_bio(struct mddev *mddev, struct bio **bio)
8627 struct block_device *bdev = (*bio)->bi_bdev;
8628 struct md_io_acct *md_io_acct;
8631 if (!blk_queue_io_stat(bdev->bd_disk->queue))
8634 percpu_ref_get(&mddev->active_io);
8636 clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set);
8637 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8638 md_io_acct->orig_bio = *bio;
8639 md_io_acct->start_time = bio_start_io_acct(*bio);
8640 md_io_acct->mddev = mddev;
8642 clone->bi_end_io = md_end_io_acct;
8643 clone->bi_private = md_io_acct;
8646 EXPORT_SYMBOL_GPL(md_account_bio);
8648 /* md_allow_write(mddev)
8649 * Calling this ensures that the array is marked 'active' so that writes
8650 * may proceed without blocking. It is important to call this before
8651 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8652 * Must be called with mddev_lock held.
8654 void md_allow_write(struct mddev *mddev)
8658 if (!md_is_rdwr(mddev))
8660 if (!mddev->pers->sync_request)
8663 spin_lock(&mddev->lock);
8664 if (mddev->in_sync) {
8666 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8667 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8668 if (mddev->safemode_delay &&
8669 mddev->safemode == 0)
8670 mddev->safemode = 1;
8671 spin_unlock(&mddev->lock);
8672 md_update_sb(mddev, 0);
8673 sysfs_notify_dirent_safe(mddev->sysfs_state);
8674 /* wait for the dirty state to be recorded in the metadata */
8675 wait_event(mddev->sb_wait,
8676 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8678 spin_unlock(&mddev->lock);
8680 EXPORT_SYMBOL_GPL(md_allow_write);
8682 #define SYNC_MARKS 10
8683 #define SYNC_MARK_STEP (3*HZ)
8684 #define UPDATE_FREQUENCY (5*60*HZ)
8685 void md_do_sync(struct md_thread *thread)
8687 struct mddev *mddev = thread->mddev;
8688 struct mddev *mddev2;
8689 unsigned int currspeed = 0, window;
8690 sector_t max_sectors,j, io_sectors, recovery_done;
8691 unsigned long mark[SYNC_MARKS];
8692 unsigned long update_time;
8693 sector_t mark_cnt[SYNC_MARKS];
8695 sector_t last_check;
8697 struct md_rdev *rdev;
8698 char *desc, *action = NULL;
8699 struct blk_plug plug;
8702 /* just incase thread restarts... */
8703 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8704 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8706 if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
8707 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8711 if (mddev_is_clustered(mddev)) {
8712 ret = md_cluster_ops->resync_start(mddev);
8716 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8717 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8718 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8719 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8720 && ((unsigned long long)mddev->curr_resync_completed
8721 < (unsigned long long)mddev->resync_max_sectors))
8725 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8726 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8727 desc = "data-check";
8729 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8730 desc = "requested-resync";
8734 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8739 mddev->last_sync_action = action ?: desc;
8742 * Before starting a resync we must have set curr_resync to
8743 * 2, and then checked that every "conflicting" array has curr_resync
8744 * less than ours. When we find one that is the same or higher
8745 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8746 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8747 * This will mean we have to start checking from the beginning again.
8752 int mddev2_minor = -1;
8753 mddev->curr_resync = MD_RESYNC_DELAYED;
8756 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8758 spin_lock(&all_mddevs_lock);
8759 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) {
8760 if (test_bit(MD_DELETED, &mddev2->flags))
8762 if (mddev2 == mddev)
8764 if (!mddev->parallel_resync
8765 && mddev2->curr_resync
8766 && match_mddev_units(mddev, mddev2)) {
8768 if (mddev < mddev2 &&
8769 mddev->curr_resync == MD_RESYNC_DELAYED) {
8770 /* arbitrarily yield */
8771 mddev->curr_resync = MD_RESYNC_YIELDED;
8772 wake_up(&resync_wait);
8774 if (mddev > mddev2 &&
8775 mddev->curr_resync == MD_RESYNC_YIELDED)
8776 /* no need to wait here, we can wait the next
8777 * time 'round when curr_resync == 2
8780 /* We need to wait 'interruptible' so as not to
8781 * contribute to the load average, and not to
8782 * be caught by 'softlockup'
8784 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8785 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8786 mddev2->curr_resync >= mddev->curr_resync) {
8787 if (mddev2_minor != mddev2->md_minor) {
8788 mddev2_minor = mddev2->md_minor;
8789 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8790 desc, mdname(mddev),
8793 spin_unlock(&all_mddevs_lock);
8795 if (signal_pending(current))
8796 flush_signals(current);
8798 finish_wait(&resync_wait, &wq);
8801 finish_wait(&resync_wait, &wq);
8804 spin_unlock(&all_mddevs_lock);
8805 } while (mddev->curr_resync < MD_RESYNC_DELAYED);
8808 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8809 /* resync follows the size requested by the personality,
8810 * which defaults to physical size, but can be virtual size
8812 max_sectors = mddev->resync_max_sectors;
8813 atomic64_set(&mddev->resync_mismatches, 0);
8814 /* we don't use the checkpoint if there's a bitmap */
8815 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8816 j = mddev->resync_min;
8817 else if (!mddev->bitmap)
8818 j = mddev->recovery_cp;
8820 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8821 max_sectors = mddev->resync_max_sectors;
8823 * If the original node aborts reshaping then we continue the
8824 * reshaping, so set j again to avoid restart reshape from the
8827 if (mddev_is_clustered(mddev) &&
8828 mddev->reshape_position != MaxSector)
8829 j = mddev->reshape_position;
8831 /* recovery follows the physical size of devices */
8832 max_sectors = mddev->dev_sectors;
8835 rdev_for_each_rcu(rdev, mddev)
8836 if (rdev->raid_disk >= 0 &&
8837 !test_bit(Journal, &rdev->flags) &&
8838 !test_bit(Faulty, &rdev->flags) &&
8839 !test_bit(In_sync, &rdev->flags) &&
8840 rdev->recovery_offset < j)
8841 j = rdev->recovery_offset;
8844 /* If there is a bitmap, we need to make sure all
8845 * writes that started before we added a spare
8846 * complete before we start doing a recovery.
8847 * Otherwise the write might complete and (via
8848 * bitmap_endwrite) set a bit in the bitmap after the
8849 * recovery has checked that bit and skipped that
8852 if (mddev->bitmap) {
8853 mddev->pers->quiesce(mddev, 1);
8854 mddev->pers->quiesce(mddev, 0);
8858 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8859 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8860 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8861 speed_max(mddev), desc);
8863 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8866 for (m = 0; m < SYNC_MARKS; m++) {
8868 mark_cnt[m] = io_sectors;
8871 mddev->resync_mark = mark[last_mark];
8872 mddev->resync_mark_cnt = mark_cnt[last_mark];
8875 * Tune reconstruction:
8877 window = 32 * (PAGE_SIZE / 512);
8878 pr_debug("md: using %dk window, over a total of %lluk.\n",
8879 window/2, (unsigned long long)max_sectors/2);
8881 atomic_set(&mddev->recovery_active, 0);
8884 if (j >= MD_RESYNC_ACTIVE) {
8885 pr_debug("md: resuming %s of %s from checkpoint.\n",
8886 desc, mdname(mddev));
8887 mddev->curr_resync = j;
8889 mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */
8890 mddev->curr_resync_completed = j;
8891 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8893 update_time = jiffies;
8895 blk_start_plug(&plug);
8896 while (j < max_sectors) {
8901 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8902 ((mddev->curr_resync > mddev->curr_resync_completed &&
8903 (mddev->curr_resync - mddev->curr_resync_completed)
8904 > (max_sectors >> 4)) ||
8905 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8906 (j - mddev->curr_resync_completed)*2
8907 >= mddev->resync_max - mddev->curr_resync_completed ||
8908 mddev->curr_resync_completed > mddev->resync_max
8910 /* time to update curr_resync_completed */
8911 wait_event(mddev->recovery_wait,
8912 atomic_read(&mddev->recovery_active) == 0);
8913 mddev->curr_resync_completed = j;
8914 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8915 j > mddev->recovery_cp)
8916 mddev->recovery_cp = j;
8917 update_time = jiffies;
8918 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8919 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8922 while (j >= mddev->resync_max &&
8923 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8924 /* As this condition is controlled by user-space,
8925 * we can block indefinitely, so use '_interruptible'
8926 * to avoid triggering warnings.
8928 flush_signals(current); /* just in case */
8929 wait_event_interruptible(mddev->recovery_wait,
8930 mddev->resync_max > j
8931 || test_bit(MD_RECOVERY_INTR,
8935 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8938 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8940 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8944 if (!skipped) { /* actual IO requested */
8945 io_sectors += sectors;
8946 atomic_add(sectors, &mddev->recovery_active);
8949 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8953 if (j > max_sectors)
8954 /* when skipping, extra large numbers can be returned. */
8956 if (j >= MD_RESYNC_ACTIVE)
8957 mddev->curr_resync = j;
8958 mddev->curr_mark_cnt = io_sectors;
8959 if (last_check == 0)
8960 /* this is the earliest that rebuild will be
8961 * visible in /proc/mdstat
8965 if (last_check + window > io_sectors || j == max_sectors)
8968 last_check = io_sectors;
8970 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8972 int next = (last_mark+1) % SYNC_MARKS;
8974 mddev->resync_mark = mark[next];
8975 mddev->resync_mark_cnt = mark_cnt[next];
8976 mark[next] = jiffies;
8977 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8981 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8985 * this loop exits only if either when we are slower than
8986 * the 'hard' speed limit, or the system was IO-idle for
8988 * the system might be non-idle CPU-wise, but we only care
8989 * about not overloading the IO subsystem. (things like an
8990 * e2fsck being done on the RAID array should execute fast)
8994 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8995 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8996 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8998 if (currspeed > speed_min(mddev)) {
8999 if (currspeed > speed_max(mddev)) {
9003 if (!is_mddev_idle(mddev, 0)) {
9005 * Give other IO more of a chance.
9006 * The faster the devices, the less we wait.
9008 wait_event(mddev->recovery_wait,
9009 !atomic_read(&mddev->recovery_active));
9013 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9014 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9015 ? "interrupted" : "done");
9017 * this also signals 'finished resyncing' to md_stop
9019 blk_finish_plug(&plug);
9020 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9022 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9023 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9024 mddev->curr_resync >= MD_RESYNC_ACTIVE) {
9025 mddev->curr_resync_completed = mddev->curr_resync;
9026 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9028 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9030 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9031 mddev->curr_resync > MD_RESYNC_ACTIVE) {
9032 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9033 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9034 if (mddev->curr_resync >= mddev->recovery_cp) {
9035 pr_debug("md: checkpointing %s of %s.\n",
9036 desc, mdname(mddev));
9037 if (test_bit(MD_RECOVERY_ERROR,
9039 mddev->recovery_cp =
9040 mddev->curr_resync_completed;
9042 mddev->recovery_cp =
9046 mddev->recovery_cp = MaxSector;
9048 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9049 mddev->curr_resync = MaxSector;
9050 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9051 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9053 rdev_for_each_rcu(rdev, mddev)
9054 if (rdev->raid_disk >= 0 &&
9055 mddev->delta_disks >= 0 &&
9056 !test_bit(Journal, &rdev->flags) &&
9057 !test_bit(Faulty, &rdev->flags) &&
9058 !test_bit(In_sync, &rdev->flags) &&
9059 rdev->recovery_offset < mddev->curr_resync)
9060 rdev->recovery_offset = mddev->curr_resync;
9066 /* set CHANGE_PENDING here since maybe another update is needed,
9067 * so other nodes are informed. It should be harmless for normal
9069 set_mask_bits(&mddev->sb_flags, 0,
9070 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9072 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9073 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9074 mddev->delta_disks > 0 &&
9075 mddev->pers->finish_reshape &&
9076 mddev->pers->size &&
9078 mddev_lock_nointr(mddev);
9079 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9080 mddev_unlock(mddev);
9081 if (!mddev_is_clustered(mddev))
9082 set_capacity_and_notify(mddev->gendisk,
9083 mddev->array_sectors);
9086 spin_lock(&mddev->lock);
9087 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9088 /* We completed so min/max setting can be forgotten if used. */
9089 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9090 mddev->resync_min = 0;
9091 mddev->resync_max = MaxSector;
9092 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9093 mddev->resync_min = mddev->curr_resync_completed;
9094 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9095 mddev->curr_resync = MD_RESYNC_NONE;
9096 spin_unlock(&mddev->lock);
9098 wake_up(&resync_wait);
9099 md_wakeup_thread(mddev->thread);
9102 EXPORT_SYMBOL_GPL(md_do_sync);
9104 static int remove_and_add_spares(struct mddev *mddev,
9105 struct md_rdev *this)
9107 struct md_rdev *rdev;
9110 bool remove_some = false;
9112 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9113 /* Mustn't remove devices when resync thread is running */
9116 rdev_for_each(rdev, mddev) {
9117 if ((this == NULL || rdev == this) &&
9118 rdev->raid_disk >= 0 &&
9119 !test_bit(Blocked, &rdev->flags) &&
9120 test_bit(Faulty, &rdev->flags) &&
9121 atomic_read(&rdev->nr_pending)==0) {
9122 /* Faulty non-Blocked devices with nr_pending == 0
9123 * never get nr_pending incremented,
9124 * never get Faulty cleared, and never get Blocked set.
9125 * So we can synchronize_rcu now rather than once per device
9128 set_bit(RemoveSynchronized, &rdev->flags);
9134 rdev_for_each(rdev, mddev) {
9135 if ((this == NULL || rdev == this) &&
9136 rdev->raid_disk >= 0 &&
9137 !test_bit(Blocked, &rdev->flags) &&
9138 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9139 (!test_bit(In_sync, &rdev->flags) &&
9140 !test_bit(Journal, &rdev->flags))) &&
9141 atomic_read(&rdev->nr_pending)==0)) {
9142 if (mddev->pers->hot_remove_disk(
9143 mddev, rdev) == 0) {
9144 sysfs_unlink_rdev(mddev, rdev);
9145 rdev->saved_raid_disk = rdev->raid_disk;
9146 rdev->raid_disk = -1;
9150 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9151 clear_bit(RemoveSynchronized, &rdev->flags);
9154 if (removed && mddev->kobj.sd)
9155 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9157 if (this && removed)
9160 rdev_for_each(rdev, mddev) {
9161 if (this && this != rdev)
9163 if (test_bit(Candidate, &rdev->flags))
9165 if (rdev->raid_disk >= 0 &&
9166 !test_bit(In_sync, &rdev->flags) &&
9167 !test_bit(Journal, &rdev->flags) &&
9168 !test_bit(Faulty, &rdev->flags))
9170 if (rdev->raid_disk >= 0)
9172 if (test_bit(Faulty, &rdev->flags))
9174 if (!test_bit(Journal, &rdev->flags)) {
9175 if (!md_is_rdwr(mddev) &&
9176 !(rdev->saved_raid_disk >= 0 &&
9177 !test_bit(Bitmap_sync, &rdev->flags)))
9180 rdev->recovery_offset = 0;
9182 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9183 /* failure here is OK */
9184 sysfs_link_rdev(mddev, rdev);
9185 if (!test_bit(Journal, &rdev->flags))
9188 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9193 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9197 static void md_start_sync(struct work_struct *ws)
9199 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9201 mddev->sync_thread = md_register_thread(md_do_sync,
9204 if (!mddev->sync_thread) {
9205 pr_warn("%s: could not start resync thread...\n",
9207 /* leave the spares where they are, it shouldn't hurt */
9208 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9209 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9210 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9211 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9212 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9213 wake_up(&resync_wait);
9214 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9216 if (mddev->sysfs_action)
9217 sysfs_notify_dirent_safe(mddev->sysfs_action);
9219 md_wakeup_thread(mddev->sync_thread);
9220 sysfs_notify_dirent_safe(mddev->sysfs_action);
9225 * This routine is regularly called by all per-raid-array threads to
9226 * deal with generic issues like resync and super-block update.
9227 * Raid personalities that don't have a thread (linear/raid0) do not
9228 * need this as they never do any recovery or update the superblock.
9230 * It does not do any resync itself, but rather "forks" off other threads
9231 * to do that as needed.
9232 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9233 * "->recovery" and create a thread at ->sync_thread.
9234 * When the thread finishes it sets MD_RECOVERY_DONE
9235 * and wakeups up this thread which will reap the thread and finish up.
9236 * This thread also removes any faulty devices (with nr_pending == 0).
9238 * The overall approach is:
9239 * 1/ if the superblock needs updating, update it.
9240 * 2/ If a recovery thread is running, don't do anything else.
9241 * 3/ If recovery has finished, clean up, possibly marking spares active.
9242 * 4/ If there are any faulty devices, remove them.
9243 * 5/ If array is degraded, try to add spares devices
9244 * 6/ If array has spares or is not in-sync, start a resync thread.
9246 void md_check_recovery(struct mddev *mddev)
9248 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9249 /* Write superblock - thread that called mddev_suspend()
9250 * holds reconfig_mutex for us.
9252 set_bit(MD_UPDATING_SB, &mddev->flags);
9253 smp_mb__after_atomic();
9254 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9255 md_update_sb(mddev, 0);
9256 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9257 wake_up(&mddev->sb_wait);
9260 if (is_md_suspended(mddev))
9264 md_bitmap_daemon_work(mddev);
9266 if (signal_pending(current)) {
9267 if (mddev->pers->sync_request && !mddev->external) {
9268 pr_debug("md: %s in immediate safe mode\n",
9270 mddev->safemode = 2;
9272 flush_signals(current);
9275 if (!md_is_rdwr(mddev) &&
9276 !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9279 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9280 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9281 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9282 (mddev->external == 0 && mddev->safemode == 1) ||
9283 (mddev->safemode == 2
9284 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9288 if (mddev_trylock(mddev)) {
9290 bool try_set_sync = mddev->safemode != 0;
9292 if (!mddev->external && mddev->safemode == 1)
9293 mddev->safemode = 0;
9295 if (!md_is_rdwr(mddev)) {
9296 struct md_rdev *rdev;
9297 if (!mddev->external && mddev->in_sync)
9298 /* 'Blocked' flag not needed as failed devices
9299 * will be recorded if array switched to read/write.
9300 * Leaving it set will prevent the device
9301 * from being removed.
9303 rdev_for_each(rdev, mddev)
9304 clear_bit(Blocked, &rdev->flags);
9305 /* On a read-only array we can:
9306 * - remove failed devices
9307 * - add already-in_sync devices if the array itself
9309 * As we only add devices that are already in-sync,
9310 * we can activate the spares immediately.
9312 remove_and_add_spares(mddev, NULL);
9313 /* There is no thread, but we need to call
9314 * ->spare_active and clear saved_raid_disk
9316 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9317 md_unregister_thread(&mddev->sync_thread);
9318 md_reap_sync_thread(mddev);
9319 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9320 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9321 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9325 if (mddev_is_clustered(mddev)) {
9326 struct md_rdev *rdev, *tmp;
9327 /* kick the device if another node issued a
9330 rdev_for_each_safe(rdev, tmp, mddev) {
9331 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9332 rdev->raid_disk < 0)
9333 md_kick_rdev_from_array(rdev);
9337 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9338 spin_lock(&mddev->lock);
9340 spin_unlock(&mddev->lock);
9343 if (mddev->sb_flags)
9344 md_update_sb(mddev, 0);
9346 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9347 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9348 /* resync/recovery still happening */
9349 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9352 if (mddev->sync_thread) {
9353 md_unregister_thread(&mddev->sync_thread);
9354 md_reap_sync_thread(mddev);
9357 /* Set RUNNING before clearing NEEDED to avoid
9358 * any transients in the value of "sync_action".
9360 mddev->curr_resync_completed = 0;
9361 spin_lock(&mddev->lock);
9362 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9363 spin_unlock(&mddev->lock);
9364 /* Clear some bits that don't mean anything, but
9367 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9368 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9370 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9371 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9373 /* no recovery is running.
9374 * remove any failed drives, then
9375 * add spares if possible.
9376 * Spares are also removed and re-added, to allow
9377 * the personality to fail the re-add.
9380 if (mddev->reshape_position != MaxSector) {
9381 if (mddev->pers->check_reshape == NULL ||
9382 mddev->pers->check_reshape(mddev) != 0)
9383 /* Cannot proceed */
9385 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9386 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9387 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9388 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9389 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9390 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9391 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9392 } else if (mddev->recovery_cp < MaxSector) {
9393 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9394 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9395 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9396 /* nothing to be done ... */
9399 if (mddev->pers->sync_request) {
9401 /* We are adding a device or devices to an array
9402 * which has the bitmap stored on all devices.
9403 * So make sure all bitmap pages get written
9405 md_bitmap_write_all(mddev->bitmap);
9407 INIT_WORK(&mddev->del_work, md_start_sync);
9408 queue_work(md_misc_wq, &mddev->del_work);
9412 if (!mddev->sync_thread) {
9413 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9414 wake_up(&resync_wait);
9415 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9417 if (mddev->sysfs_action)
9418 sysfs_notify_dirent_safe(mddev->sysfs_action);
9421 wake_up(&mddev->sb_wait);
9422 mddev_unlock(mddev);
9425 EXPORT_SYMBOL(md_check_recovery);
9427 void md_reap_sync_thread(struct mddev *mddev)
9429 struct md_rdev *rdev;
9430 sector_t old_dev_sectors = mddev->dev_sectors;
9431 bool is_reshaped = false;
9433 /* sync_thread should be unregistered, collect result */
9434 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9435 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9436 mddev->degraded != mddev->raid_disks) {
9438 /* activate any spares */
9439 if (mddev->pers->spare_active(mddev)) {
9440 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9441 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9444 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9445 mddev->pers->finish_reshape) {
9446 mddev->pers->finish_reshape(mddev);
9447 if (mddev_is_clustered(mddev))
9451 /* If array is no-longer degraded, then any saved_raid_disk
9452 * information must be scrapped.
9454 if (!mddev->degraded)
9455 rdev_for_each(rdev, mddev)
9456 rdev->saved_raid_disk = -1;
9458 md_update_sb(mddev, 1);
9459 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9460 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9462 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9463 md_cluster_ops->resync_finish(mddev);
9464 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9465 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9466 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9467 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9468 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9469 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9471 * We call md_cluster_ops->update_size here because sync_size could
9472 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9473 * so it is time to update size across cluster.
9475 if (mddev_is_clustered(mddev) && is_reshaped
9476 && !test_bit(MD_CLOSING, &mddev->flags))
9477 md_cluster_ops->update_size(mddev, old_dev_sectors);
9478 wake_up(&resync_wait);
9479 /* flag recovery needed just to double check */
9480 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9481 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9482 sysfs_notify_dirent_safe(mddev->sysfs_action);
9484 if (mddev->event_work.func)
9485 queue_work(md_misc_wq, &mddev->event_work);
9487 EXPORT_SYMBOL(md_reap_sync_thread);
9489 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9491 sysfs_notify_dirent_safe(rdev->sysfs_state);
9492 wait_event_timeout(rdev->blocked_wait,
9493 !test_bit(Blocked, &rdev->flags) &&
9494 !test_bit(BlockedBadBlocks, &rdev->flags),
9495 msecs_to_jiffies(5000));
9496 rdev_dec_pending(rdev, mddev);
9498 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9500 void md_finish_reshape(struct mddev *mddev)
9502 /* called be personality module when reshape completes. */
9503 struct md_rdev *rdev;
9505 rdev_for_each(rdev, mddev) {
9506 if (rdev->data_offset > rdev->new_data_offset)
9507 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9509 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9510 rdev->data_offset = rdev->new_data_offset;
9513 EXPORT_SYMBOL(md_finish_reshape);
9515 /* Bad block management */
9517 /* Returns 1 on success, 0 on failure */
9518 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9521 struct mddev *mddev = rdev->mddev;
9524 s += rdev->new_data_offset;
9526 s += rdev->data_offset;
9527 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9529 /* Make sure they get written out promptly */
9530 if (test_bit(ExternalBbl, &rdev->flags))
9531 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9532 sysfs_notify_dirent_safe(rdev->sysfs_state);
9533 set_mask_bits(&mddev->sb_flags, 0,
9534 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9535 md_wakeup_thread(rdev->mddev->thread);
9540 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9542 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9547 s += rdev->new_data_offset;
9549 s += rdev->data_offset;
9550 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9551 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9552 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9555 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9557 static int md_notify_reboot(struct notifier_block *this,
9558 unsigned long code, void *x)
9560 struct mddev *mddev, *n;
9563 spin_lock(&all_mddevs_lock);
9564 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9565 if (!mddev_get(mddev))
9567 spin_unlock(&all_mddevs_lock);
9568 if (mddev_trylock(mddev)) {
9570 __md_stop_writes(mddev);
9571 if (mddev->persistent)
9572 mddev->safemode = 2;
9573 mddev_unlock(mddev);
9577 spin_lock(&all_mddevs_lock);
9579 spin_unlock(&all_mddevs_lock);
9582 * certain more exotic SCSI devices are known to be
9583 * volatile wrt too early system reboots. While the
9584 * right place to handle this issue is the given
9585 * driver, we do want to have a safe RAID driver ...
9593 static struct notifier_block md_notifier = {
9594 .notifier_call = md_notify_reboot,
9596 .priority = INT_MAX, /* before any real devices */
9599 static void md_geninit(void)
9601 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9603 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9606 static int __init md_init(void)
9610 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9614 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9618 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9619 if (!md_rdev_misc_wq)
9620 goto err_rdev_misc_wq;
9622 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9626 ret = __register_blkdev(0, "mdp", md_probe);
9631 register_reboot_notifier(&md_notifier);
9632 raid_table_header = register_sysctl("dev/raid", raid_table);
9638 unregister_blkdev(MD_MAJOR, "md");
9640 destroy_workqueue(md_rdev_misc_wq);
9642 destroy_workqueue(md_misc_wq);
9644 destroy_workqueue(md_wq);
9649 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9651 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9652 struct md_rdev *rdev2, *tmp;
9656 * If size is changed in another node then we need to
9657 * do resize as well.
9659 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9660 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9662 pr_info("md-cluster: resize failed\n");
9664 md_bitmap_update_sb(mddev->bitmap);
9667 /* Check for change of roles in the active devices */
9668 rdev_for_each_safe(rdev2, tmp, mddev) {
9669 if (test_bit(Faulty, &rdev2->flags))
9672 /* Check if the roles changed */
9673 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9675 if (test_bit(Candidate, &rdev2->flags)) {
9676 if (role == MD_DISK_ROLE_FAULTY) {
9677 pr_info("md: Removing Candidate device %pg because add failed\n",
9679 md_kick_rdev_from_array(rdev2);
9683 clear_bit(Candidate, &rdev2->flags);
9686 if (role != rdev2->raid_disk) {
9688 * got activated except reshape is happening.
9690 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9691 !(le32_to_cpu(sb->feature_map) &
9692 MD_FEATURE_RESHAPE_ACTIVE)) {
9693 rdev2->saved_raid_disk = role;
9694 ret = remove_and_add_spares(mddev, rdev2);
9695 pr_info("Activated spare: %pg\n",
9697 /* wakeup mddev->thread here, so array could
9698 * perform resync with the new activated disk */
9699 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9700 md_wakeup_thread(mddev->thread);
9703 * We just want to do the minimum to mark the disk
9704 * as faulty. The recovery is performed by the
9705 * one who initiated the error.
9707 if (role == MD_DISK_ROLE_FAULTY ||
9708 role == MD_DISK_ROLE_JOURNAL) {
9709 md_error(mddev, rdev2);
9710 clear_bit(Blocked, &rdev2->flags);
9715 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9716 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9718 pr_warn("md: updating array disks failed. %d\n", ret);
9722 * Since mddev->delta_disks has already updated in update_raid_disks,
9723 * so it is time to check reshape.
9725 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9726 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9728 * reshape is happening in the remote node, we need to
9729 * update reshape_position and call start_reshape.
9731 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9732 if (mddev->pers->update_reshape_pos)
9733 mddev->pers->update_reshape_pos(mddev);
9734 if (mddev->pers->start_reshape)
9735 mddev->pers->start_reshape(mddev);
9736 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9737 mddev->reshape_position != MaxSector &&
9738 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9739 /* reshape is just done in another node. */
9740 mddev->reshape_position = MaxSector;
9741 if (mddev->pers->update_reshape_pos)
9742 mddev->pers->update_reshape_pos(mddev);
9745 /* Finally set the event to be up to date */
9746 mddev->events = le64_to_cpu(sb->events);
9749 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9752 struct page *swapout = rdev->sb_page;
9753 struct mdp_superblock_1 *sb;
9755 /* Store the sb page of the rdev in the swapout temporary
9756 * variable in case we err in the future
9758 rdev->sb_page = NULL;
9759 err = alloc_disk_sb(rdev);
9761 ClearPageUptodate(rdev->sb_page);
9762 rdev->sb_loaded = 0;
9763 err = super_types[mddev->major_version].
9764 load_super(rdev, NULL, mddev->minor_version);
9767 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9768 __func__, __LINE__, rdev->desc_nr, err);
9770 put_page(rdev->sb_page);
9771 rdev->sb_page = swapout;
9772 rdev->sb_loaded = 1;
9776 sb = page_address(rdev->sb_page);
9777 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9781 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9782 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9784 /* The other node finished recovery, call spare_active to set
9785 * device In_sync and mddev->degraded
9787 if (rdev->recovery_offset == MaxSector &&
9788 !test_bit(In_sync, &rdev->flags) &&
9789 mddev->pers->spare_active(mddev))
9790 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9796 void md_reload_sb(struct mddev *mddev, int nr)
9798 struct md_rdev *rdev = NULL, *iter;
9802 rdev_for_each_rcu(iter, mddev) {
9803 if (iter->desc_nr == nr) {
9810 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9814 err = read_rdev(mddev, rdev);
9818 check_sb_changes(mddev, rdev);
9820 /* Read all rdev's to update recovery_offset */
9821 rdev_for_each_rcu(rdev, mddev) {
9822 if (!test_bit(Faulty, &rdev->flags))
9823 read_rdev(mddev, rdev);
9826 EXPORT_SYMBOL(md_reload_sb);
9831 * Searches all registered partitions for autorun RAID arrays
9835 static DEFINE_MUTEX(detected_devices_mutex);
9836 static LIST_HEAD(all_detected_devices);
9837 struct detected_devices_node {
9838 struct list_head list;
9842 void md_autodetect_dev(dev_t dev)
9844 struct detected_devices_node *node_detected_dev;
9846 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9847 if (node_detected_dev) {
9848 node_detected_dev->dev = dev;
9849 mutex_lock(&detected_devices_mutex);
9850 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9851 mutex_unlock(&detected_devices_mutex);
9855 void md_autostart_arrays(int part)
9857 struct md_rdev *rdev;
9858 struct detected_devices_node *node_detected_dev;
9860 int i_scanned, i_passed;
9865 pr_info("md: Autodetecting RAID arrays.\n");
9867 mutex_lock(&detected_devices_mutex);
9868 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9870 node_detected_dev = list_entry(all_detected_devices.next,
9871 struct detected_devices_node, list);
9872 list_del(&node_detected_dev->list);
9873 dev = node_detected_dev->dev;
9874 kfree(node_detected_dev);
9875 mutex_unlock(&detected_devices_mutex);
9876 rdev = md_import_device(dev,0, 90);
9877 mutex_lock(&detected_devices_mutex);
9881 if (test_bit(Faulty, &rdev->flags))
9884 set_bit(AutoDetected, &rdev->flags);
9885 list_add(&rdev->same_set, &pending_raid_disks);
9888 mutex_unlock(&detected_devices_mutex);
9890 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9892 autorun_devices(part);
9895 #endif /* !MODULE */
9897 static __exit void md_exit(void)
9899 struct mddev *mddev, *n;
9902 unregister_blkdev(MD_MAJOR,"md");
9903 unregister_blkdev(mdp_major, "mdp");
9904 unregister_reboot_notifier(&md_notifier);
9905 unregister_sysctl_table(raid_table_header);
9907 /* We cannot unload the modules while some process is
9908 * waiting for us in select() or poll() - wake them up
9911 while (waitqueue_active(&md_event_waiters)) {
9912 /* not safe to leave yet */
9913 wake_up(&md_event_waiters);
9917 remove_proc_entry("mdstat", NULL);
9919 spin_lock(&all_mddevs_lock);
9920 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9921 if (!mddev_get(mddev))
9923 spin_unlock(&all_mddevs_lock);
9924 export_array(mddev);
9926 mddev->hold_active = 0;
9928 * As the mddev is now fully clear, mddev_put will schedule
9929 * the mddev for destruction by a workqueue, and the
9930 * destroy_workqueue() below will wait for that to complete.
9933 spin_lock(&all_mddevs_lock);
9935 spin_unlock(&all_mddevs_lock);
9937 destroy_workqueue(md_rdev_misc_wq);
9938 destroy_workqueue(md_misc_wq);
9939 destroy_workqueue(md_wq);
9942 subsys_initcall(md_init);
9943 module_exit(md_exit)
9945 static int get_ro(char *buffer, const struct kernel_param *kp)
9947 return sprintf(buffer, "%d\n", start_readonly);
9949 static int set_ro(const char *val, const struct kernel_param *kp)
9951 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9954 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9955 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9956 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9957 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9959 MODULE_LICENSE("GPL");
9960 MODULE_DESCRIPTION("MD RAID framework");
9962 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);