1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/badblocks.h>
45 #include <linux/sysctl.h>
46 #include <linux/seq_file.h>
48 #include <linux/poll.h>
49 #include <linux/ctype.h>
50 #include <linux/string.h>
51 #include <linux/hdreg.h>
52 #include <linux/proc_fs.h>
53 #include <linux/random.h>
54 #include <linux/module.h>
55 #include <linux/reboot.h>
56 #include <linux/file.h>
57 #include <linux/compat.h>
58 #include <linux/delay.h>
59 #include <linux/raid/md_p.h>
60 #include <linux/raid/md_u.h>
61 #include <linux/raid/detect.h>
62 #include <linux/slab.h>
63 #include <linux/percpu-refcount.h>
64 #include <linux/part_stat.h>
66 #include <trace/events/block.h>
68 #include "md-bitmap.h"
69 #include "md-cluster.h"
71 /* pers_list is a list of registered personalities protected
73 * pers_lock does extra service to protect accesses to
74 * mddev->thread when the mutex cannot be held.
76 static LIST_HEAD(pers_list);
77 static DEFINE_SPINLOCK(pers_lock);
79 static struct kobj_type md_ktype;
81 struct md_cluster_operations *md_cluster_ops;
82 EXPORT_SYMBOL(md_cluster_ops);
83 static struct module *md_cluster_mod;
85 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
86 static struct workqueue_struct *md_wq;
87 static struct workqueue_struct *md_misc_wq;
88 static struct workqueue_struct *md_rdev_misc_wq;
90 static int remove_and_add_spares(struct mddev *mddev,
91 struct md_rdev *this);
92 static void mddev_detach(struct mddev *mddev);
95 * Default number of read corrections we'll attempt on an rdev
96 * before ejecting it from the array. We divide the read error
97 * count by 2 for every hour elapsed between read errors.
99 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
100 /* Default safemode delay: 200 msec */
101 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
103 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
104 * is 1000 KB/sec, so the extra system load does not show up that much.
105 * Increase it if you want to have more _guaranteed_ speed. Note that
106 * the RAID driver will use the maximum available bandwidth if the IO
107 * subsystem is idle. There is also an 'absolute maximum' reconstruction
108 * speed limit - in case reconstruction slows down your system despite
111 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
112 * or /sys/block/mdX/md/sync_speed_{min,max}
115 static int sysctl_speed_limit_min = 1000;
116 static int sysctl_speed_limit_max = 200000;
117 static inline int speed_min(struct mddev *mddev)
119 return mddev->sync_speed_min ?
120 mddev->sync_speed_min : sysctl_speed_limit_min;
123 static inline int speed_max(struct mddev *mddev)
125 return mddev->sync_speed_max ?
126 mddev->sync_speed_max : sysctl_speed_limit_max;
129 static void rdev_uninit_serial(struct md_rdev *rdev)
131 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
134 kvfree(rdev->serial);
138 static void rdevs_uninit_serial(struct mddev *mddev)
140 struct md_rdev *rdev;
142 rdev_for_each(rdev, mddev)
143 rdev_uninit_serial(rdev);
146 static int rdev_init_serial(struct md_rdev *rdev)
148 /* serial_nums equals with BARRIER_BUCKETS_NR */
149 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
150 struct serial_in_rdev *serial = NULL;
152 if (test_bit(CollisionCheck, &rdev->flags))
155 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
160 for (i = 0; i < serial_nums; i++) {
161 struct serial_in_rdev *serial_tmp = &serial[i];
163 spin_lock_init(&serial_tmp->serial_lock);
164 serial_tmp->serial_rb = RB_ROOT_CACHED;
165 init_waitqueue_head(&serial_tmp->serial_io_wait);
168 rdev->serial = serial;
169 set_bit(CollisionCheck, &rdev->flags);
174 static int rdevs_init_serial(struct mddev *mddev)
176 struct md_rdev *rdev;
179 rdev_for_each(rdev, mddev) {
180 ret = rdev_init_serial(rdev);
185 /* Free all resources if pool is not existed */
186 if (ret && !mddev->serial_info_pool)
187 rdevs_uninit_serial(mddev);
193 * rdev needs to enable serial stuffs if it meets the conditions:
194 * 1. it is multi-queue device flaged with writemostly.
195 * 2. the write-behind mode is enabled.
197 static int rdev_need_serial(struct md_rdev *rdev)
199 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
200 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
201 test_bit(WriteMostly, &rdev->flags));
205 * Init resource for rdev(s), then create serial_info_pool if:
206 * 1. rdev is the first device which return true from rdev_enable_serial.
207 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
209 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
214 if (rdev && !rdev_need_serial(rdev) &&
215 !test_bit(CollisionCheck, &rdev->flags))
219 mddev_suspend(mddev);
222 ret = rdevs_init_serial(mddev);
224 ret = rdev_init_serial(rdev);
228 if (mddev->serial_info_pool == NULL) {
230 * already in memalloc noio context by
233 mddev->serial_info_pool =
234 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
235 sizeof(struct serial_info));
236 if (!mddev->serial_info_pool) {
237 rdevs_uninit_serial(mddev);
238 pr_err("can't alloc memory pool for serialization\n");
248 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
249 * 1. rdev is the last device flaged with CollisionCheck.
250 * 2. when bitmap is destroyed while policy is not enabled.
251 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
253 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
256 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
259 if (mddev->serial_info_pool) {
260 struct md_rdev *temp;
261 int num = 0; /* used to track if other rdevs need the pool */
264 mddev_suspend(mddev);
265 rdev_for_each(temp, mddev) {
267 if (!mddev->serialize_policy ||
268 !rdev_need_serial(temp))
269 rdev_uninit_serial(temp);
272 } else if (temp != rdev &&
273 test_bit(CollisionCheck, &temp->flags))
278 rdev_uninit_serial(rdev);
281 pr_info("The mempool could be used by other devices\n");
283 mempool_destroy(mddev->serial_info_pool);
284 mddev->serial_info_pool = NULL;
291 static struct ctl_table_header *raid_table_header;
293 static struct ctl_table raid_table[] = {
295 .procname = "speed_limit_min",
296 .data = &sysctl_speed_limit_min,
297 .maxlen = sizeof(int),
298 .mode = S_IRUGO|S_IWUSR,
299 .proc_handler = proc_dointvec,
302 .procname = "speed_limit_max",
303 .data = &sysctl_speed_limit_max,
304 .maxlen = sizeof(int),
305 .mode = S_IRUGO|S_IWUSR,
306 .proc_handler = proc_dointvec,
311 static struct ctl_table raid_dir_table[] = {
315 .mode = S_IRUGO|S_IXUGO,
321 static struct ctl_table raid_root_table[] = {
326 .child = raid_dir_table,
331 static int start_readonly;
334 * The original mechanism for creating an md device is to create
335 * a device node in /dev and to open it. This causes races with device-close.
336 * The preferred method is to write to the "new_array" module parameter.
337 * This can avoid races.
338 * Setting create_on_open to false disables the original mechanism
339 * so all the races disappear.
341 static bool create_on_open = true;
344 * We have a system wide 'event count' that is incremented
345 * on any 'interesting' event, and readers of /proc/mdstat
346 * can use 'poll' or 'select' to find out when the event
350 * start array, stop array, error, add device, remove device,
351 * start build, activate spare
353 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
354 static atomic_t md_event_count;
355 void md_new_event(struct mddev *mddev)
357 atomic_inc(&md_event_count);
358 wake_up(&md_event_waiters);
360 EXPORT_SYMBOL_GPL(md_new_event);
363 * Enables to iterate over all existing md arrays
364 * all_mddevs_lock protects this list.
366 static LIST_HEAD(all_mddevs);
367 static DEFINE_SPINLOCK(all_mddevs_lock);
370 * iterates through all used mddevs in the system.
371 * We take care to grab the all_mddevs_lock whenever navigating
372 * the list, and to always hold a refcount when unlocked.
373 * Any code which breaks out of this loop while own
374 * a reference to the current mddev and must mddev_put it.
376 #define for_each_mddev(_mddev,_tmp) \
378 for (({ spin_lock(&all_mddevs_lock); \
379 _tmp = all_mddevs.next; \
381 ({ if (_tmp != &all_mddevs) \
382 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
383 spin_unlock(&all_mddevs_lock); \
384 if (_mddev) mddev_put(_mddev); \
385 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
386 _tmp != &all_mddevs;}); \
387 ({ spin_lock(&all_mddevs_lock); \
388 _tmp = _tmp->next;}) \
391 /* Rather than calling directly into the personality make_request function,
392 * IO requests come here first so that we can check if the device is
393 * being suspended pending a reconfiguration.
394 * We hold a refcount over the call to ->make_request. By the time that
395 * call has finished, the bio has been linked into some internal structure
396 * and so is visible to ->quiesce(), so we don't need the refcount any more.
398 static bool is_suspended(struct mddev *mddev, struct bio *bio)
400 if (mddev->suspended)
402 if (bio_data_dir(bio) != WRITE)
404 if (mddev->suspend_lo >= mddev->suspend_hi)
406 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
408 if (bio_end_sector(bio) < mddev->suspend_lo)
413 void md_handle_request(struct mddev *mddev, struct bio *bio)
417 if (is_suspended(mddev, bio)) {
420 prepare_to_wait(&mddev->sb_wait, &__wait,
421 TASK_UNINTERRUPTIBLE);
422 if (!is_suspended(mddev, bio))
428 finish_wait(&mddev->sb_wait, &__wait);
430 atomic_inc(&mddev->active_io);
433 if (!mddev->pers->make_request(mddev, bio)) {
434 atomic_dec(&mddev->active_io);
435 wake_up(&mddev->sb_wait);
436 goto check_suspended;
439 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
440 wake_up(&mddev->sb_wait);
442 EXPORT_SYMBOL(md_handle_request);
444 static blk_qc_t md_submit_bio(struct bio *bio)
446 const int rw = bio_data_dir(bio);
447 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
449 if (mddev == NULL || mddev->pers == NULL) {
451 return BLK_QC_T_NONE;
454 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
456 return BLK_QC_T_NONE;
459 blk_queue_split(&bio);
461 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
462 if (bio_sectors(bio) != 0)
463 bio->bi_status = BLK_STS_IOERR;
465 return BLK_QC_T_NONE;
468 /* bio could be mergeable after passing to underlayer */
469 bio->bi_opf &= ~REQ_NOMERGE;
471 md_handle_request(mddev, bio);
473 return BLK_QC_T_NONE;
476 /* mddev_suspend makes sure no new requests are submitted
477 * to the device, and that any requests that have been submitted
478 * are completely handled.
479 * Once mddev_detach() is called and completes, the module will be
482 void mddev_suspend(struct mddev *mddev)
484 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
485 lockdep_assert_held(&mddev->reconfig_mutex);
486 if (mddev->suspended++)
489 wake_up(&mddev->sb_wait);
490 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
491 smp_mb__after_atomic();
492 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
493 mddev->pers->quiesce(mddev, 1);
494 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
495 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
497 del_timer_sync(&mddev->safemode_timer);
498 /* restrict memory reclaim I/O during raid array is suspend */
499 mddev->noio_flag = memalloc_noio_save();
501 EXPORT_SYMBOL_GPL(mddev_suspend);
503 void mddev_resume(struct mddev *mddev)
505 /* entred the memalloc scope from mddev_suspend() */
506 memalloc_noio_restore(mddev->noio_flag);
507 lockdep_assert_held(&mddev->reconfig_mutex);
508 if (--mddev->suspended)
510 wake_up(&mddev->sb_wait);
511 mddev->pers->quiesce(mddev, 0);
513 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
514 md_wakeup_thread(mddev->thread);
515 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
517 EXPORT_SYMBOL_GPL(mddev_resume);
520 * Generic flush handling for md
523 static void md_end_flush(struct bio *bio)
525 struct md_rdev *rdev = bio->bi_private;
526 struct mddev *mddev = rdev->mddev;
528 rdev_dec_pending(rdev, mddev);
530 if (atomic_dec_and_test(&mddev->flush_pending)) {
531 /* The pre-request flush has finished */
532 queue_work(md_wq, &mddev->flush_work);
537 static void md_submit_flush_data(struct work_struct *ws);
539 static void submit_flushes(struct work_struct *ws)
541 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
542 struct md_rdev *rdev;
544 mddev->start_flush = ktime_get_boottime();
545 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
546 atomic_set(&mddev->flush_pending, 1);
548 rdev_for_each_rcu(rdev, mddev)
549 if (rdev->raid_disk >= 0 &&
550 !test_bit(Faulty, &rdev->flags)) {
551 /* Take two references, one is dropped
552 * when request finishes, one after
553 * we reclaim rcu_read_lock
556 atomic_inc(&rdev->nr_pending);
557 atomic_inc(&rdev->nr_pending);
559 bi = bio_alloc_bioset(GFP_NOIO, 0, &mddev->bio_set);
560 bi->bi_end_io = md_end_flush;
561 bi->bi_private = rdev;
562 bio_set_dev(bi, rdev->bdev);
563 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
564 atomic_inc(&mddev->flush_pending);
567 rdev_dec_pending(rdev, mddev);
570 if (atomic_dec_and_test(&mddev->flush_pending))
571 queue_work(md_wq, &mddev->flush_work);
574 static void md_submit_flush_data(struct work_struct *ws)
576 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
577 struct bio *bio = mddev->flush_bio;
580 * must reset flush_bio before calling into md_handle_request to avoid a
581 * deadlock, because other bios passed md_handle_request suspend check
582 * could wait for this and below md_handle_request could wait for those
583 * bios because of suspend check
585 spin_lock_irq(&mddev->lock);
586 mddev->prev_flush_start = mddev->start_flush;
587 mddev->flush_bio = NULL;
588 spin_unlock_irq(&mddev->lock);
589 wake_up(&mddev->sb_wait);
591 if (bio->bi_iter.bi_size == 0) {
592 /* an empty barrier - all done */
595 bio->bi_opf &= ~REQ_PREFLUSH;
596 md_handle_request(mddev, bio);
601 * Manages consolidation of flushes and submitting any flushes needed for
602 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
603 * being finished in another context. Returns false if the flushing is
604 * complete but still needs the I/O portion of the bio to be processed.
606 bool md_flush_request(struct mddev *mddev, struct bio *bio)
608 ktime_t req_start = ktime_get_boottime();
609 spin_lock_irq(&mddev->lock);
610 /* flush requests wait until ongoing flush completes,
611 * hence coalescing all the pending requests.
613 wait_event_lock_irq(mddev->sb_wait,
615 ktime_before(req_start, mddev->prev_flush_start),
617 /* new request after previous flush is completed */
618 if (ktime_after(req_start, mddev->prev_flush_start)) {
619 WARN_ON(mddev->flush_bio);
620 mddev->flush_bio = bio;
623 spin_unlock_irq(&mddev->lock);
626 INIT_WORK(&mddev->flush_work, submit_flushes);
627 queue_work(md_wq, &mddev->flush_work);
629 /* flush was performed for some other bio while we waited. */
630 if (bio->bi_iter.bi_size == 0)
631 /* an empty barrier - all done */
634 bio->bi_opf &= ~REQ_PREFLUSH;
640 EXPORT_SYMBOL(md_flush_request);
642 static inline struct mddev *mddev_get(struct mddev *mddev)
644 atomic_inc(&mddev->active);
648 static void mddev_delayed_delete(struct work_struct *ws);
650 static void mddev_put(struct mddev *mddev)
652 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
654 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
655 mddev->ctime == 0 && !mddev->hold_active) {
656 /* Array is not configured at all, and not held active,
658 list_del_init(&mddev->all_mddevs);
661 * Call queue_work inside the spinlock so that
662 * flush_workqueue() after mddev_find will succeed in waiting
663 * for the work to be done.
665 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
666 queue_work(md_misc_wq, &mddev->del_work);
668 spin_unlock(&all_mddevs_lock);
671 static void md_safemode_timeout(struct timer_list *t);
673 void mddev_init(struct mddev *mddev)
675 kobject_init(&mddev->kobj, &md_ktype);
676 mutex_init(&mddev->open_mutex);
677 mutex_init(&mddev->reconfig_mutex);
678 mutex_init(&mddev->bitmap_info.mutex);
679 INIT_LIST_HEAD(&mddev->disks);
680 INIT_LIST_HEAD(&mddev->all_mddevs);
681 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
682 atomic_set(&mddev->active, 1);
683 atomic_set(&mddev->openers, 0);
684 atomic_set(&mddev->active_io, 0);
685 spin_lock_init(&mddev->lock);
686 atomic_set(&mddev->flush_pending, 0);
687 init_waitqueue_head(&mddev->sb_wait);
688 init_waitqueue_head(&mddev->recovery_wait);
689 mddev->reshape_position = MaxSector;
690 mddev->reshape_backwards = 0;
691 mddev->last_sync_action = "none";
692 mddev->resync_min = 0;
693 mddev->resync_max = MaxSector;
694 mddev->level = LEVEL_NONE;
696 EXPORT_SYMBOL_GPL(mddev_init);
698 static struct mddev *mddev_find_locked(dev_t unit)
702 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
703 if (mddev->unit == unit)
709 /* find an unused unit number */
710 static dev_t mddev_alloc_unit(void)
712 static int next_minor = 512;
713 int start = next_minor;
718 dev = MKDEV(MD_MAJOR, next_minor);
720 if (next_minor > MINORMASK)
722 if (next_minor == start)
723 return 0; /* Oh dear, all in use. */
724 is_free = !mddev_find_locked(dev);
730 static struct mddev *mddev_find(dev_t unit)
734 if (MAJOR(unit) != MD_MAJOR)
735 unit &= ~((1 << MdpMinorShift) - 1);
737 spin_lock(&all_mddevs_lock);
738 mddev = mddev_find_locked(unit);
741 spin_unlock(&all_mddevs_lock);
746 static struct mddev *mddev_alloc(dev_t unit)
751 if (unit && MAJOR(unit) != MD_MAJOR)
752 unit &= ~((1 << MdpMinorShift) - 1);
754 new = kzalloc(sizeof(*new), GFP_KERNEL);
756 return ERR_PTR(-ENOMEM);
759 spin_lock(&all_mddevs_lock);
762 if (mddev_find_locked(unit))
765 if (MAJOR(unit) == MD_MAJOR)
766 new->md_minor = MINOR(unit);
768 new->md_minor = MINOR(unit) >> MdpMinorShift;
769 new->hold_active = UNTIL_IOCTL;
772 new->unit = mddev_alloc_unit();
775 new->md_minor = MINOR(new->unit);
776 new->hold_active = UNTIL_STOP;
779 list_add(&new->all_mddevs, &all_mddevs);
780 spin_unlock(&all_mddevs_lock);
783 spin_unlock(&all_mddevs_lock);
785 return ERR_PTR(error);
788 static const struct attribute_group md_redundancy_group;
790 void mddev_unlock(struct mddev *mddev)
792 if (mddev->to_remove) {
793 /* These cannot be removed under reconfig_mutex as
794 * an access to the files will try to take reconfig_mutex
795 * while holding the file unremovable, which leads to
797 * So hold set sysfs_active while the remove in happeing,
798 * and anything else which might set ->to_remove or my
799 * otherwise change the sysfs namespace will fail with
800 * -EBUSY if sysfs_active is still set.
801 * We set sysfs_active under reconfig_mutex and elsewhere
802 * test it under the same mutex to ensure its correct value
805 const struct attribute_group *to_remove = mddev->to_remove;
806 mddev->to_remove = NULL;
807 mddev->sysfs_active = 1;
808 mutex_unlock(&mddev->reconfig_mutex);
810 if (mddev->kobj.sd) {
811 if (to_remove != &md_redundancy_group)
812 sysfs_remove_group(&mddev->kobj, to_remove);
813 if (mddev->pers == NULL ||
814 mddev->pers->sync_request == NULL) {
815 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
816 if (mddev->sysfs_action)
817 sysfs_put(mddev->sysfs_action);
818 if (mddev->sysfs_completed)
819 sysfs_put(mddev->sysfs_completed);
820 if (mddev->sysfs_degraded)
821 sysfs_put(mddev->sysfs_degraded);
822 mddev->sysfs_action = NULL;
823 mddev->sysfs_completed = NULL;
824 mddev->sysfs_degraded = NULL;
827 mddev->sysfs_active = 0;
829 mutex_unlock(&mddev->reconfig_mutex);
831 /* As we've dropped the mutex we need a spinlock to
832 * make sure the thread doesn't disappear
834 spin_lock(&pers_lock);
835 md_wakeup_thread(mddev->thread);
836 wake_up(&mddev->sb_wait);
837 spin_unlock(&pers_lock);
839 EXPORT_SYMBOL_GPL(mddev_unlock);
841 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
843 struct md_rdev *rdev;
845 rdev_for_each_rcu(rdev, mddev)
846 if (rdev->desc_nr == nr)
851 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
853 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
855 struct md_rdev *rdev;
857 rdev_for_each(rdev, mddev)
858 if (rdev->bdev->bd_dev == dev)
864 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
866 struct md_rdev *rdev;
868 rdev_for_each_rcu(rdev, mddev)
869 if (rdev->bdev->bd_dev == dev)
874 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
876 static struct md_personality *find_pers(int level, char *clevel)
878 struct md_personality *pers;
879 list_for_each_entry(pers, &pers_list, list) {
880 if (level != LEVEL_NONE && pers->level == level)
882 if (strcmp(pers->name, clevel)==0)
888 /* return the offset of the super block in 512byte sectors */
889 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
891 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
892 return MD_NEW_SIZE_SECTORS(num_sectors);
895 static int alloc_disk_sb(struct md_rdev *rdev)
897 rdev->sb_page = alloc_page(GFP_KERNEL);
903 void md_rdev_clear(struct md_rdev *rdev)
906 put_page(rdev->sb_page);
908 rdev->sb_page = NULL;
913 put_page(rdev->bb_page);
914 rdev->bb_page = NULL;
916 badblocks_exit(&rdev->badblocks);
918 EXPORT_SYMBOL_GPL(md_rdev_clear);
920 static void super_written(struct bio *bio)
922 struct md_rdev *rdev = bio->bi_private;
923 struct mddev *mddev = rdev->mddev;
925 if (bio->bi_status) {
926 pr_err("md: %s gets error=%d\n", __func__,
927 blk_status_to_errno(bio->bi_status));
928 md_error(mddev, rdev);
929 if (!test_bit(Faulty, &rdev->flags)
930 && (bio->bi_opf & MD_FAILFAST)) {
931 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
932 set_bit(LastDev, &rdev->flags);
935 clear_bit(LastDev, &rdev->flags);
937 if (atomic_dec_and_test(&mddev->pending_writes))
938 wake_up(&mddev->sb_wait);
939 rdev_dec_pending(rdev, mddev);
943 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
944 sector_t sector, int size, struct page *page)
946 /* write first size bytes of page to sector of rdev
947 * Increment mddev->pending_writes before returning
948 * and decrement it on completion, waking up sb_wait
949 * if zero is reached.
950 * If an error occurred, call md_error
958 if (test_bit(Faulty, &rdev->flags))
961 bio = bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
963 atomic_inc(&rdev->nr_pending);
965 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
966 bio->bi_iter.bi_sector = sector;
967 bio_add_page(bio, page, size, 0);
968 bio->bi_private = rdev;
969 bio->bi_end_io = super_written;
971 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
972 test_bit(FailFast, &rdev->flags) &&
973 !test_bit(LastDev, &rdev->flags))
975 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
977 atomic_inc(&mddev->pending_writes);
981 int md_super_wait(struct mddev *mddev)
983 /* wait for all superblock writes that were scheduled to complete */
984 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
985 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
990 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
991 struct page *page, int op, int op_flags, bool metadata_op)
996 bio_init(&bio, &bvec, 1);
998 if (metadata_op && rdev->meta_bdev)
999 bio_set_dev(&bio, rdev->meta_bdev);
1001 bio_set_dev(&bio, rdev->bdev);
1002 bio.bi_opf = op | op_flags;
1004 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1005 else if (rdev->mddev->reshape_position != MaxSector &&
1006 (rdev->mddev->reshape_backwards ==
1007 (sector >= rdev->mddev->reshape_position)))
1008 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1010 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1011 bio_add_page(&bio, page, size, 0);
1013 submit_bio_wait(&bio);
1015 return !bio.bi_status;
1017 EXPORT_SYMBOL_GPL(sync_page_io);
1019 static int read_disk_sb(struct md_rdev *rdev, int size)
1021 char b[BDEVNAME_SIZE];
1023 if (rdev->sb_loaded)
1026 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
1028 rdev->sb_loaded = 1;
1032 pr_err("md: disabled device %s, could not read superblock.\n",
1033 bdevname(rdev->bdev,b));
1037 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1039 return sb1->set_uuid0 == sb2->set_uuid0 &&
1040 sb1->set_uuid1 == sb2->set_uuid1 &&
1041 sb1->set_uuid2 == sb2->set_uuid2 &&
1042 sb1->set_uuid3 == sb2->set_uuid3;
1045 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1048 mdp_super_t *tmp1, *tmp2;
1050 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1051 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1053 if (!tmp1 || !tmp2) {
1062 * nr_disks is not constant
1067 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1074 static u32 md_csum_fold(u32 csum)
1076 csum = (csum & 0xffff) + (csum >> 16);
1077 return (csum & 0xffff) + (csum >> 16);
1080 static unsigned int calc_sb_csum(mdp_super_t *sb)
1083 u32 *sb32 = (u32*)sb;
1085 unsigned int disk_csum, csum;
1087 disk_csum = sb->sb_csum;
1090 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1092 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1095 /* This used to use csum_partial, which was wrong for several
1096 * reasons including that different results are returned on
1097 * different architectures. It isn't critical that we get exactly
1098 * the same return value as before (we always csum_fold before
1099 * testing, and that removes any differences). However as we
1100 * know that csum_partial always returned a 16bit value on
1101 * alphas, do a fold to maximise conformity to previous behaviour.
1103 sb->sb_csum = md_csum_fold(disk_csum);
1105 sb->sb_csum = disk_csum;
1111 * Handle superblock details.
1112 * We want to be able to handle multiple superblock formats
1113 * so we have a common interface to them all, and an array of
1114 * different handlers.
1115 * We rely on user-space to write the initial superblock, and support
1116 * reading and updating of superblocks.
1117 * Interface methods are:
1118 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1119 * loads and validates a superblock on dev.
1120 * if refdev != NULL, compare superblocks on both devices
1122 * 0 - dev has a superblock that is compatible with refdev
1123 * 1 - dev has a superblock that is compatible and newer than refdev
1124 * so dev should be used as the refdev in future
1125 * -EINVAL superblock incompatible or invalid
1126 * -othererror e.g. -EIO
1128 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1129 * Verify that dev is acceptable into mddev.
1130 * The first time, mddev->raid_disks will be 0, and data from
1131 * dev should be merged in. Subsequent calls check that dev
1132 * is new enough. Return 0 or -EINVAL
1134 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1135 * Update the superblock for rdev with data in mddev
1136 * This does not write to disc.
1142 struct module *owner;
1143 int (*load_super)(struct md_rdev *rdev,
1144 struct md_rdev *refdev,
1146 int (*validate_super)(struct mddev *mddev,
1147 struct md_rdev *rdev);
1148 void (*sync_super)(struct mddev *mddev,
1149 struct md_rdev *rdev);
1150 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1151 sector_t num_sectors);
1152 int (*allow_new_offset)(struct md_rdev *rdev,
1153 unsigned long long new_offset);
1157 * Check that the given mddev has no bitmap.
1159 * This function is called from the run method of all personalities that do not
1160 * support bitmaps. It prints an error message and returns non-zero if mddev
1161 * has a bitmap. Otherwise, it returns 0.
1164 int md_check_no_bitmap(struct mddev *mddev)
1166 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1168 pr_warn("%s: bitmaps are not supported for %s\n",
1169 mdname(mddev), mddev->pers->name);
1172 EXPORT_SYMBOL(md_check_no_bitmap);
1175 * load_super for 0.90.0
1177 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1179 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1182 bool spare_disk = true;
1185 * Calculate the position of the superblock (512byte sectors),
1186 * it's at the end of the disk.
1188 * It also happens to be a multiple of 4Kb.
1190 rdev->sb_start = calc_dev_sboffset(rdev);
1192 ret = read_disk_sb(rdev, MD_SB_BYTES);
1198 bdevname(rdev->bdev, b);
1199 sb = page_address(rdev->sb_page);
1201 if (sb->md_magic != MD_SB_MAGIC) {
1202 pr_warn("md: invalid raid superblock magic on %s\n", b);
1206 if (sb->major_version != 0 ||
1207 sb->minor_version < 90 ||
1208 sb->minor_version > 91) {
1209 pr_warn("Bad version number %d.%d on %s\n",
1210 sb->major_version, sb->minor_version, b);
1214 if (sb->raid_disks <= 0)
1217 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1218 pr_warn("md: invalid superblock checksum on %s\n", b);
1222 rdev->preferred_minor = sb->md_minor;
1223 rdev->data_offset = 0;
1224 rdev->new_data_offset = 0;
1225 rdev->sb_size = MD_SB_BYTES;
1226 rdev->badblocks.shift = -1;
1228 if (sb->level == LEVEL_MULTIPATH)
1231 rdev->desc_nr = sb->this_disk.number;
1233 /* not spare disk, or LEVEL_MULTIPATH */
1234 if (sb->level == LEVEL_MULTIPATH ||
1235 (rdev->desc_nr >= 0 &&
1236 rdev->desc_nr < MD_SB_DISKS &&
1237 sb->disks[rdev->desc_nr].state &
1238 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1248 mdp_super_t *refsb = page_address(refdev->sb_page);
1249 if (!md_uuid_equal(refsb, sb)) {
1250 pr_warn("md: %s has different UUID to %s\n",
1251 b, bdevname(refdev->bdev,b2));
1254 if (!md_sb_equal(refsb, sb)) {
1255 pr_warn("md: %s has same UUID but different superblock to %s\n",
1256 b, bdevname(refdev->bdev, b2));
1260 ev2 = md_event(refsb);
1262 if (!spare_disk && ev1 > ev2)
1267 rdev->sectors = rdev->sb_start;
1268 /* Limit to 4TB as metadata cannot record more than that.
1269 * (not needed for Linear and RAID0 as metadata doesn't
1272 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1273 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1275 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1276 /* "this cannot possibly happen" ... */
1284 * validate_super for 0.90.0
1286 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1289 mdp_super_t *sb = page_address(rdev->sb_page);
1290 __u64 ev1 = md_event(sb);
1292 rdev->raid_disk = -1;
1293 clear_bit(Faulty, &rdev->flags);
1294 clear_bit(In_sync, &rdev->flags);
1295 clear_bit(Bitmap_sync, &rdev->flags);
1296 clear_bit(WriteMostly, &rdev->flags);
1298 if (mddev->raid_disks == 0) {
1299 mddev->major_version = 0;
1300 mddev->minor_version = sb->minor_version;
1301 mddev->patch_version = sb->patch_version;
1302 mddev->external = 0;
1303 mddev->chunk_sectors = sb->chunk_size >> 9;
1304 mddev->ctime = sb->ctime;
1305 mddev->utime = sb->utime;
1306 mddev->level = sb->level;
1307 mddev->clevel[0] = 0;
1308 mddev->layout = sb->layout;
1309 mddev->raid_disks = sb->raid_disks;
1310 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1311 mddev->events = ev1;
1312 mddev->bitmap_info.offset = 0;
1313 mddev->bitmap_info.space = 0;
1314 /* bitmap can use 60 K after the 4K superblocks */
1315 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1316 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1317 mddev->reshape_backwards = 0;
1319 if (mddev->minor_version >= 91) {
1320 mddev->reshape_position = sb->reshape_position;
1321 mddev->delta_disks = sb->delta_disks;
1322 mddev->new_level = sb->new_level;
1323 mddev->new_layout = sb->new_layout;
1324 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1325 if (mddev->delta_disks < 0)
1326 mddev->reshape_backwards = 1;
1328 mddev->reshape_position = MaxSector;
1329 mddev->delta_disks = 0;
1330 mddev->new_level = mddev->level;
1331 mddev->new_layout = mddev->layout;
1332 mddev->new_chunk_sectors = mddev->chunk_sectors;
1334 if (mddev->level == 0)
1337 if (sb->state & (1<<MD_SB_CLEAN))
1338 mddev->recovery_cp = MaxSector;
1340 if (sb->events_hi == sb->cp_events_hi &&
1341 sb->events_lo == sb->cp_events_lo) {
1342 mddev->recovery_cp = sb->recovery_cp;
1344 mddev->recovery_cp = 0;
1347 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1348 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1349 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1350 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1352 mddev->max_disks = MD_SB_DISKS;
1354 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1355 mddev->bitmap_info.file == NULL) {
1356 mddev->bitmap_info.offset =
1357 mddev->bitmap_info.default_offset;
1358 mddev->bitmap_info.space =
1359 mddev->bitmap_info.default_space;
1362 } else if (mddev->pers == NULL) {
1363 /* Insist on good event counter while assembling, except
1364 * for spares (which don't need an event count) */
1366 if (sb->disks[rdev->desc_nr].state & (
1367 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1368 if (ev1 < mddev->events)
1370 } else if (mddev->bitmap) {
1371 /* if adding to array with a bitmap, then we can accept an
1372 * older device ... but not too old.
1374 if (ev1 < mddev->bitmap->events_cleared)
1376 if (ev1 < mddev->events)
1377 set_bit(Bitmap_sync, &rdev->flags);
1379 if (ev1 < mddev->events)
1380 /* just a hot-add of a new device, leave raid_disk at -1 */
1384 if (mddev->level != LEVEL_MULTIPATH) {
1385 desc = sb->disks + rdev->desc_nr;
1387 if (desc->state & (1<<MD_DISK_FAULTY))
1388 set_bit(Faulty, &rdev->flags);
1389 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1390 desc->raid_disk < mddev->raid_disks */) {
1391 set_bit(In_sync, &rdev->flags);
1392 rdev->raid_disk = desc->raid_disk;
1393 rdev->saved_raid_disk = desc->raid_disk;
1394 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1395 /* active but not in sync implies recovery up to
1396 * reshape position. We don't know exactly where
1397 * that is, so set to zero for now */
1398 if (mddev->minor_version >= 91) {
1399 rdev->recovery_offset = 0;
1400 rdev->raid_disk = desc->raid_disk;
1403 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1404 set_bit(WriteMostly, &rdev->flags);
1405 if (desc->state & (1<<MD_DISK_FAILFAST))
1406 set_bit(FailFast, &rdev->flags);
1407 } else /* MULTIPATH are always insync */
1408 set_bit(In_sync, &rdev->flags);
1413 * sync_super for 0.90.0
1415 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1418 struct md_rdev *rdev2;
1419 int next_spare = mddev->raid_disks;
1421 /* make rdev->sb match mddev data..
1424 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1425 * 3/ any empty disks < next_spare become removed
1427 * disks[0] gets initialised to REMOVED because
1428 * we cannot be sure from other fields if it has
1429 * been initialised or not.
1432 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1434 rdev->sb_size = MD_SB_BYTES;
1436 sb = page_address(rdev->sb_page);
1438 memset(sb, 0, sizeof(*sb));
1440 sb->md_magic = MD_SB_MAGIC;
1441 sb->major_version = mddev->major_version;
1442 sb->patch_version = mddev->patch_version;
1443 sb->gvalid_words = 0; /* ignored */
1444 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1445 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1446 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1447 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1449 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1450 sb->level = mddev->level;
1451 sb->size = mddev->dev_sectors / 2;
1452 sb->raid_disks = mddev->raid_disks;
1453 sb->md_minor = mddev->md_minor;
1454 sb->not_persistent = 0;
1455 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1457 sb->events_hi = (mddev->events>>32);
1458 sb->events_lo = (u32)mddev->events;
1460 if (mddev->reshape_position == MaxSector)
1461 sb->minor_version = 90;
1463 sb->minor_version = 91;
1464 sb->reshape_position = mddev->reshape_position;
1465 sb->new_level = mddev->new_level;
1466 sb->delta_disks = mddev->delta_disks;
1467 sb->new_layout = mddev->new_layout;
1468 sb->new_chunk = mddev->new_chunk_sectors << 9;
1470 mddev->minor_version = sb->minor_version;
1473 sb->recovery_cp = mddev->recovery_cp;
1474 sb->cp_events_hi = (mddev->events>>32);
1475 sb->cp_events_lo = (u32)mddev->events;
1476 if (mddev->recovery_cp == MaxSector)
1477 sb->state = (1<< MD_SB_CLEAN);
1479 sb->recovery_cp = 0;
1481 sb->layout = mddev->layout;
1482 sb->chunk_size = mddev->chunk_sectors << 9;
1484 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1485 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1487 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1488 rdev_for_each(rdev2, mddev) {
1491 int is_active = test_bit(In_sync, &rdev2->flags);
1493 if (rdev2->raid_disk >= 0 &&
1494 sb->minor_version >= 91)
1495 /* we have nowhere to store the recovery_offset,
1496 * but if it is not below the reshape_position,
1497 * we can piggy-back on that.
1500 if (rdev2->raid_disk < 0 ||
1501 test_bit(Faulty, &rdev2->flags))
1504 desc_nr = rdev2->raid_disk;
1506 desc_nr = next_spare++;
1507 rdev2->desc_nr = desc_nr;
1508 d = &sb->disks[rdev2->desc_nr];
1510 d->number = rdev2->desc_nr;
1511 d->major = MAJOR(rdev2->bdev->bd_dev);
1512 d->minor = MINOR(rdev2->bdev->bd_dev);
1514 d->raid_disk = rdev2->raid_disk;
1516 d->raid_disk = rdev2->desc_nr; /* compatibility */
1517 if (test_bit(Faulty, &rdev2->flags))
1518 d->state = (1<<MD_DISK_FAULTY);
1519 else if (is_active) {
1520 d->state = (1<<MD_DISK_ACTIVE);
1521 if (test_bit(In_sync, &rdev2->flags))
1522 d->state |= (1<<MD_DISK_SYNC);
1530 if (test_bit(WriteMostly, &rdev2->flags))
1531 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1532 if (test_bit(FailFast, &rdev2->flags))
1533 d->state |= (1<<MD_DISK_FAILFAST);
1535 /* now set the "removed" and "faulty" bits on any missing devices */
1536 for (i=0 ; i < mddev->raid_disks ; i++) {
1537 mdp_disk_t *d = &sb->disks[i];
1538 if (d->state == 0 && d->number == 0) {
1541 d->state = (1<<MD_DISK_REMOVED);
1542 d->state |= (1<<MD_DISK_FAULTY);
1546 sb->nr_disks = nr_disks;
1547 sb->active_disks = active;
1548 sb->working_disks = working;
1549 sb->failed_disks = failed;
1550 sb->spare_disks = spare;
1552 sb->this_disk = sb->disks[rdev->desc_nr];
1553 sb->sb_csum = calc_sb_csum(sb);
1557 * rdev_size_change for 0.90.0
1559 static unsigned long long
1560 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1562 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1563 return 0; /* component must fit device */
1564 if (rdev->mddev->bitmap_info.offset)
1565 return 0; /* can't move bitmap */
1566 rdev->sb_start = calc_dev_sboffset(rdev);
1567 if (!num_sectors || num_sectors > rdev->sb_start)
1568 num_sectors = rdev->sb_start;
1569 /* Limit to 4TB as metadata cannot record more than that.
1570 * 4TB == 2^32 KB, or 2*2^32 sectors.
1572 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1573 num_sectors = (sector_t)(2ULL << 32) - 2;
1575 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1577 } while (md_super_wait(rdev->mddev) < 0);
1582 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1584 /* non-zero offset changes not possible with v0.90 */
1585 return new_offset == 0;
1589 * version 1 superblock
1592 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1596 unsigned long long newcsum;
1597 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1598 __le32 *isuper = (__le32*)sb;
1600 disk_csum = sb->sb_csum;
1603 for (; size >= 4; size -= 4)
1604 newcsum += le32_to_cpu(*isuper++);
1607 newcsum += le16_to_cpu(*(__le16*) isuper);
1609 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1610 sb->sb_csum = disk_csum;
1611 return cpu_to_le32(csum);
1614 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1616 struct mdp_superblock_1 *sb;
1620 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1622 bool spare_disk = true;
1625 * Calculate the position of the superblock in 512byte sectors.
1626 * It is always aligned to a 4K boundary and
1627 * depeding on minor_version, it can be:
1628 * 0: At least 8K, but less than 12K, from end of device
1629 * 1: At start of device
1630 * 2: 4K from start of device.
1632 switch(minor_version) {
1634 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1636 sb_start &= ~(sector_t)(4*2-1);
1647 rdev->sb_start = sb_start;
1649 /* superblock is rarely larger than 1K, but it can be larger,
1650 * and it is safe to read 4k, so we do that
1652 ret = read_disk_sb(rdev, 4096);
1653 if (ret) return ret;
1655 sb = page_address(rdev->sb_page);
1657 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1658 sb->major_version != cpu_to_le32(1) ||
1659 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1660 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1661 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1664 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1665 pr_warn("md: invalid superblock checksum on %s\n",
1666 bdevname(rdev->bdev,b));
1669 if (le64_to_cpu(sb->data_size) < 10) {
1670 pr_warn("md: data_size too small on %s\n",
1671 bdevname(rdev->bdev,b));
1676 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1677 /* Some padding is non-zero, might be a new feature */
1680 rdev->preferred_minor = 0xffff;
1681 rdev->data_offset = le64_to_cpu(sb->data_offset);
1682 rdev->new_data_offset = rdev->data_offset;
1683 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1684 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1685 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1686 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1688 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1689 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1690 if (rdev->sb_size & bmask)
1691 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1694 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1697 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1700 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1703 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1705 if (!rdev->bb_page) {
1706 rdev->bb_page = alloc_page(GFP_KERNEL);
1710 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1711 rdev->badblocks.count == 0) {
1712 /* need to load the bad block list.
1713 * Currently we limit it to one page.
1719 int sectors = le16_to_cpu(sb->bblog_size);
1720 if (sectors > (PAGE_SIZE / 512))
1722 offset = le32_to_cpu(sb->bblog_offset);
1725 bb_sector = (long long)offset;
1726 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1727 rdev->bb_page, REQ_OP_READ, 0, true))
1729 bbp = (__le64 *)page_address(rdev->bb_page);
1730 rdev->badblocks.shift = sb->bblog_shift;
1731 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1732 u64 bb = le64_to_cpu(*bbp);
1733 int count = bb & (0x3ff);
1734 u64 sector = bb >> 10;
1735 sector <<= sb->bblog_shift;
1736 count <<= sb->bblog_shift;
1739 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1742 } else if (sb->bblog_offset != 0)
1743 rdev->badblocks.shift = 0;
1745 if ((le32_to_cpu(sb->feature_map) &
1746 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1747 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1748 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1749 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1752 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1756 /* not spare disk, or LEVEL_MULTIPATH */
1757 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1758 (rdev->desc_nr >= 0 &&
1759 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1760 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1761 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1771 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1773 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1774 sb->level != refsb->level ||
1775 sb->layout != refsb->layout ||
1776 sb->chunksize != refsb->chunksize) {
1777 pr_warn("md: %s has strangely different superblock to %s\n",
1778 bdevname(rdev->bdev,b),
1779 bdevname(refdev->bdev,b2));
1782 ev1 = le64_to_cpu(sb->events);
1783 ev2 = le64_to_cpu(refsb->events);
1785 if (!spare_disk && ev1 > ev2)
1790 if (minor_version) {
1791 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1792 sectors -= rdev->data_offset;
1794 sectors = rdev->sb_start;
1795 if (sectors < le64_to_cpu(sb->data_size))
1797 rdev->sectors = le64_to_cpu(sb->data_size);
1801 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1803 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1804 __u64 ev1 = le64_to_cpu(sb->events);
1806 rdev->raid_disk = -1;
1807 clear_bit(Faulty, &rdev->flags);
1808 clear_bit(In_sync, &rdev->flags);
1809 clear_bit(Bitmap_sync, &rdev->flags);
1810 clear_bit(WriteMostly, &rdev->flags);
1812 if (mddev->raid_disks == 0) {
1813 mddev->major_version = 1;
1814 mddev->patch_version = 0;
1815 mddev->external = 0;
1816 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1817 mddev->ctime = le64_to_cpu(sb->ctime);
1818 mddev->utime = le64_to_cpu(sb->utime);
1819 mddev->level = le32_to_cpu(sb->level);
1820 mddev->clevel[0] = 0;
1821 mddev->layout = le32_to_cpu(sb->layout);
1822 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1823 mddev->dev_sectors = le64_to_cpu(sb->size);
1824 mddev->events = ev1;
1825 mddev->bitmap_info.offset = 0;
1826 mddev->bitmap_info.space = 0;
1827 /* Default location for bitmap is 1K after superblock
1828 * using 3K - total of 4K
1830 mddev->bitmap_info.default_offset = 1024 >> 9;
1831 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1832 mddev->reshape_backwards = 0;
1834 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1835 memcpy(mddev->uuid, sb->set_uuid, 16);
1837 mddev->max_disks = (4096-256)/2;
1839 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1840 mddev->bitmap_info.file == NULL) {
1841 mddev->bitmap_info.offset =
1842 (__s32)le32_to_cpu(sb->bitmap_offset);
1843 /* Metadata doesn't record how much space is available.
1844 * For 1.0, we assume we can use up to the superblock
1845 * if before, else to 4K beyond superblock.
1846 * For others, assume no change is possible.
1848 if (mddev->minor_version > 0)
1849 mddev->bitmap_info.space = 0;
1850 else if (mddev->bitmap_info.offset > 0)
1851 mddev->bitmap_info.space =
1852 8 - mddev->bitmap_info.offset;
1854 mddev->bitmap_info.space =
1855 -mddev->bitmap_info.offset;
1858 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1859 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1860 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1861 mddev->new_level = le32_to_cpu(sb->new_level);
1862 mddev->new_layout = le32_to_cpu(sb->new_layout);
1863 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1864 if (mddev->delta_disks < 0 ||
1865 (mddev->delta_disks == 0 &&
1866 (le32_to_cpu(sb->feature_map)
1867 & MD_FEATURE_RESHAPE_BACKWARDS)))
1868 mddev->reshape_backwards = 1;
1870 mddev->reshape_position = MaxSector;
1871 mddev->delta_disks = 0;
1872 mddev->new_level = mddev->level;
1873 mddev->new_layout = mddev->layout;
1874 mddev->new_chunk_sectors = mddev->chunk_sectors;
1877 if (mddev->level == 0 &&
1878 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1881 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1882 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1884 if (le32_to_cpu(sb->feature_map) &
1885 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1886 if (le32_to_cpu(sb->feature_map) &
1887 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1889 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1890 (le32_to_cpu(sb->feature_map) &
1891 MD_FEATURE_MULTIPLE_PPLS))
1893 set_bit(MD_HAS_PPL, &mddev->flags);
1895 } else if (mddev->pers == NULL) {
1896 /* Insist of good event counter while assembling, except for
1897 * spares (which don't need an event count) */
1899 if (rdev->desc_nr >= 0 &&
1900 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1901 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1902 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1903 if (ev1 < mddev->events)
1905 } else if (mddev->bitmap) {
1906 /* If adding to array with a bitmap, then we can accept an
1907 * older device, but not too old.
1909 if (ev1 < mddev->bitmap->events_cleared)
1911 if (ev1 < mddev->events)
1912 set_bit(Bitmap_sync, &rdev->flags);
1914 if (ev1 < mddev->events)
1915 /* just a hot-add of a new device, leave raid_disk at -1 */
1918 if (mddev->level != LEVEL_MULTIPATH) {
1920 if (rdev->desc_nr < 0 ||
1921 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1922 role = MD_DISK_ROLE_SPARE;
1925 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1927 case MD_DISK_ROLE_SPARE: /* spare */
1929 case MD_DISK_ROLE_FAULTY: /* faulty */
1930 set_bit(Faulty, &rdev->flags);
1932 case MD_DISK_ROLE_JOURNAL: /* journal device */
1933 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1934 /* journal device without journal feature */
1935 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1938 set_bit(Journal, &rdev->flags);
1939 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1940 rdev->raid_disk = 0;
1943 rdev->saved_raid_disk = role;
1944 if ((le32_to_cpu(sb->feature_map) &
1945 MD_FEATURE_RECOVERY_OFFSET)) {
1946 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1947 if (!(le32_to_cpu(sb->feature_map) &
1948 MD_FEATURE_RECOVERY_BITMAP))
1949 rdev->saved_raid_disk = -1;
1952 * If the array is FROZEN, then the device can't
1953 * be in_sync with rest of array.
1955 if (!test_bit(MD_RECOVERY_FROZEN,
1957 set_bit(In_sync, &rdev->flags);
1959 rdev->raid_disk = role;
1962 if (sb->devflags & WriteMostly1)
1963 set_bit(WriteMostly, &rdev->flags);
1964 if (sb->devflags & FailFast1)
1965 set_bit(FailFast, &rdev->flags);
1966 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1967 set_bit(Replacement, &rdev->flags);
1968 } else /* MULTIPATH are always insync */
1969 set_bit(In_sync, &rdev->flags);
1974 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1976 struct mdp_superblock_1 *sb;
1977 struct md_rdev *rdev2;
1979 /* make rdev->sb match mddev and rdev data. */
1981 sb = page_address(rdev->sb_page);
1983 sb->feature_map = 0;
1985 sb->recovery_offset = cpu_to_le64(0);
1986 memset(sb->pad3, 0, sizeof(sb->pad3));
1988 sb->utime = cpu_to_le64((__u64)mddev->utime);
1989 sb->events = cpu_to_le64(mddev->events);
1991 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1992 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1993 sb->resync_offset = cpu_to_le64(MaxSector);
1995 sb->resync_offset = cpu_to_le64(0);
1997 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1999 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2000 sb->size = cpu_to_le64(mddev->dev_sectors);
2001 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2002 sb->level = cpu_to_le32(mddev->level);
2003 sb->layout = cpu_to_le32(mddev->layout);
2004 if (test_bit(FailFast, &rdev->flags))
2005 sb->devflags |= FailFast1;
2007 sb->devflags &= ~FailFast1;
2009 if (test_bit(WriteMostly, &rdev->flags))
2010 sb->devflags |= WriteMostly1;
2012 sb->devflags &= ~WriteMostly1;
2013 sb->data_offset = cpu_to_le64(rdev->data_offset);
2014 sb->data_size = cpu_to_le64(rdev->sectors);
2016 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2017 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2018 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2021 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2022 !test_bit(In_sync, &rdev->flags)) {
2024 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2025 sb->recovery_offset =
2026 cpu_to_le64(rdev->recovery_offset);
2027 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2029 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2031 /* Note: recovery_offset and journal_tail share space */
2032 if (test_bit(Journal, &rdev->flags))
2033 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2034 if (test_bit(Replacement, &rdev->flags))
2036 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2038 if (mddev->reshape_position != MaxSector) {
2039 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2040 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2041 sb->new_layout = cpu_to_le32(mddev->new_layout);
2042 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2043 sb->new_level = cpu_to_le32(mddev->new_level);
2044 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2045 if (mddev->delta_disks == 0 &&
2046 mddev->reshape_backwards)
2048 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2049 if (rdev->new_data_offset != rdev->data_offset) {
2051 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2052 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2053 - rdev->data_offset));
2057 if (mddev_is_clustered(mddev))
2058 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2060 if (rdev->badblocks.count == 0)
2061 /* Nothing to do for bad blocks*/ ;
2062 else if (sb->bblog_offset == 0)
2063 /* Cannot record bad blocks on this device */
2064 md_error(mddev, rdev);
2066 struct badblocks *bb = &rdev->badblocks;
2067 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2069 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2074 seq = read_seqbegin(&bb->lock);
2076 memset(bbp, 0xff, PAGE_SIZE);
2078 for (i = 0 ; i < bb->count ; i++) {
2079 u64 internal_bb = p[i];
2080 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2081 | BB_LEN(internal_bb));
2082 bbp[i] = cpu_to_le64(store_bb);
2085 if (read_seqretry(&bb->lock, seq))
2088 bb->sector = (rdev->sb_start +
2089 (int)le32_to_cpu(sb->bblog_offset));
2090 bb->size = le16_to_cpu(sb->bblog_size);
2095 rdev_for_each(rdev2, mddev)
2096 if (rdev2->desc_nr+1 > max_dev)
2097 max_dev = rdev2->desc_nr+1;
2099 if (max_dev > le32_to_cpu(sb->max_dev)) {
2101 sb->max_dev = cpu_to_le32(max_dev);
2102 rdev->sb_size = max_dev * 2 + 256;
2103 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2104 if (rdev->sb_size & bmask)
2105 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2107 max_dev = le32_to_cpu(sb->max_dev);
2109 for (i=0; i<max_dev;i++)
2110 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2112 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2113 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2115 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2116 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2118 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2120 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2121 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2122 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2125 rdev_for_each(rdev2, mddev) {
2127 if (test_bit(Faulty, &rdev2->flags))
2128 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2129 else if (test_bit(In_sync, &rdev2->flags))
2130 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2131 else if (test_bit(Journal, &rdev2->flags))
2132 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2133 else if (rdev2->raid_disk >= 0)
2134 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2136 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2139 sb->sb_csum = calc_sb_1_csum(sb);
2142 static sector_t super_1_choose_bm_space(sector_t dev_size)
2146 /* if the device is bigger than 8Gig, save 64k for bitmap
2147 * usage, if bigger than 200Gig, save 128k
2149 if (dev_size < 64*2)
2151 else if (dev_size - 64*2 >= 200*1024*1024*2)
2153 else if (dev_size - 4*2 > 8*1024*1024*2)
2160 static unsigned long long
2161 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2163 struct mdp_superblock_1 *sb;
2164 sector_t max_sectors;
2165 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2166 return 0; /* component must fit device */
2167 if (rdev->data_offset != rdev->new_data_offset)
2168 return 0; /* too confusing */
2169 if (rdev->sb_start < rdev->data_offset) {
2170 /* minor versions 1 and 2; superblock before data */
2171 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2172 max_sectors -= rdev->data_offset;
2173 if (!num_sectors || num_sectors > max_sectors)
2174 num_sectors = max_sectors;
2175 } else if (rdev->mddev->bitmap_info.offset) {
2176 /* minor version 0 with bitmap we can't move */
2179 /* minor version 0; superblock after data */
2180 sector_t sb_start, bm_space;
2181 sector_t dev_size = i_size_read(rdev->bdev->bd_inode) >> 9;
2183 /* 8K is for superblock */
2184 sb_start = dev_size - 8*2;
2185 sb_start &= ~(sector_t)(4*2 - 1);
2187 bm_space = super_1_choose_bm_space(dev_size);
2189 /* Space that can be used to store date needs to decrease
2190 * superblock bitmap space and bad block space(4K)
2192 max_sectors = sb_start - bm_space - 4*2;
2194 if (!num_sectors || num_sectors > max_sectors)
2195 num_sectors = max_sectors;
2196 rdev->sb_start = sb_start;
2198 sb = page_address(rdev->sb_page);
2199 sb->data_size = cpu_to_le64(num_sectors);
2200 sb->super_offset = cpu_to_le64(rdev->sb_start);
2201 sb->sb_csum = calc_sb_1_csum(sb);
2203 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2205 } while (md_super_wait(rdev->mddev) < 0);
2211 super_1_allow_new_offset(struct md_rdev *rdev,
2212 unsigned long long new_offset)
2214 /* All necessary checks on new >= old have been done */
2215 struct bitmap *bitmap;
2216 if (new_offset >= rdev->data_offset)
2219 /* with 1.0 metadata, there is no metadata to tread on
2220 * so we can always move back */
2221 if (rdev->mddev->minor_version == 0)
2224 /* otherwise we must be sure not to step on
2225 * any metadata, so stay:
2226 * 36K beyond start of superblock
2227 * beyond end of badblocks
2228 * beyond write-intent bitmap
2230 if (rdev->sb_start + (32+4)*2 > new_offset)
2232 bitmap = rdev->mddev->bitmap;
2233 if (bitmap && !rdev->mddev->bitmap_info.file &&
2234 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2235 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2237 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2243 static struct super_type super_types[] = {
2246 .owner = THIS_MODULE,
2247 .load_super = super_90_load,
2248 .validate_super = super_90_validate,
2249 .sync_super = super_90_sync,
2250 .rdev_size_change = super_90_rdev_size_change,
2251 .allow_new_offset = super_90_allow_new_offset,
2255 .owner = THIS_MODULE,
2256 .load_super = super_1_load,
2257 .validate_super = super_1_validate,
2258 .sync_super = super_1_sync,
2259 .rdev_size_change = super_1_rdev_size_change,
2260 .allow_new_offset = super_1_allow_new_offset,
2264 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2266 if (mddev->sync_super) {
2267 mddev->sync_super(mddev, rdev);
2271 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2273 super_types[mddev->major_version].sync_super(mddev, rdev);
2276 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2278 struct md_rdev *rdev, *rdev2;
2281 rdev_for_each_rcu(rdev, mddev1) {
2282 if (test_bit(Faulty, &rdev->flags) ||
2283 test_bit(Journal, &rdev->flags) ||
2284 rdev->raid_disk == -1)
2286 rdev_for_each_rcu(rdev2, mddev2) {
2287 if (test_bit(Faulty, &rdev2->flags) ||
2288 test_bit(Journal, &rdev2->flags) ||
2289 rdev2->raid_disk == -1)
2291 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2301 static LIST_HEAD(pending_raid_disks);
2304 * Try to register data integrity profile for an mddev
2306 * This is called when an array is started and after a disk has been kicked
2307 * from the array. It only succeeds if all working and active component devices
2308 * are integrity capable with matching profiles.
2310 int md_integrity_register(struct mddev *mddev)
2312 struct md_rdev *rdev, *reference = NULL;
2314 if (list_empty(&mddev->disks))
2315 return 0; /* nothing to do */
2316 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2317 return 0; /* shouldn't register, or already is */
2318 rdev_for_each(rdev, mddev) {
2319 /* skip spares and non-functional disks */
2320 if (test_bit(Faulty, &rdev->flags))
2322 if (rdev->raid_disk < 0)
2325 /* Use the first rdev as the reference */
2329 /* does this rdev's profile match the reference profile? */
2330 if (blk_integrity_compare(reference->bdev->bd_disk,
2331 rdev->bdev->bd_disk) < 0)
2334 if (!reference || !bdev_get_integrity(reference->bdev))
2337 * All component devices are integrity capable and have matching
2338 * profiles, register the common profile for the md device.
2340 blk_integrity_register(mddev->gendisk,
2341 bdev_get_integrity(reference->bdev));
2343 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2344 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2345 (mddev->level != 1 && mddev->level != 10 &&
2346 bioset_integrity_create(&mddev->io_acct_set, BIO_POOL_SIZE))) {
2348 * No need to handle the failure of bioset_integrity_create,
2349 * because the function is called by md_run() -> pers->run(),
2350 * md_run calls bioset_exit -> bioset_integrity_free in case
2353 pr_err("md: failed to create integrity pool for %s\n",
2359 EXPORT_SYMBOL(md_integrity_register);
2362 * Attempt to add an rdev, but only if it is consistent with the current
2365 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2367 struct blk_integrity *bi_mddev;
2368 char name[BDEVNAME_SIZE];
2370 if (!mddev->gendisk)
2373 bi_mddev = blk_get_integrity(mddev->gendisk);
2375 if (!bi_mddev) /* nothing to do */
2378 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2379 pr_err("%s: incompatible integrity profile for %s\n",
2380 mdname(mddev), bdevname(rdev->bdev, name));
2386 EXPORT_SYMBOL(md_integrity_add_rdev);
2388 static bool rdev_read_only(struct md_rdev *rdev)
2390 return bdev_read_only(rdev->bdev) ||
2391 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2394 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2396 char b[BDEVNAME_SIZE];
2399 /* prevent duplicates */
2400 if (find_rdev(mddev, rdev->bdev->bd_dev))
2403 if (rdev_read_only(rdev) && mddev->pers)
2406 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2407 if (!test_bit(Journal, &rdev->flags) &&
2409 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2411 /* Cannot change size, so fail
2412 * If mddev->level <= 0, then we don't care
2413 * about aligning sizes (e.g. linear)
2415 if (mddev->level > 0)
2418 mddev->dev_sectors = rdev->sectors;
2421 /* Verify rdev->desc_nr is unique.
2422 * If it is -1, assign a free number, else
2423 * check number is not in use
2426 if (rdev->desc_nr < 0) {
2429 choice = mddev->raid_disks;
2430 while (md_find_rdev_nr_rcu(mddev, choice))
2432 rdev->desc_nr = choice;
2434 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2440 if (!test_bit(Journal, &rdev->flags) &&
2441 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2442 pr_warn("md: %s: array is limited to %d devices\n",
2443 mdname(mddev), mddev->max_disks);
2446 bdevname(rdev->bdev,b);
2447 strreplace(b, '/', '!');
2449 rdev->mddev = mddev;
2450 pr_debug("md: bind<%s>\n", b);
2452 if (mddev->raid_disks)
2453 mddev_create_serial_pool(mddev, rdev, false);
2455 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2458 /* failure here is OK */
2459 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2460 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2461 rdev->sysfs_unack_badblocks =
2462 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2463 rdev->sysfs_badblocks =
2464 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2466 list_add_rcu(&rdev->same_set, &mddev->disks);
2467 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2469 /* May as well allow recovery to be retried once */
2470 mddev->recovery_disabled++;
2475 pr_warn("md: failed to register dev-%s for %s\n",
2480 static void rdev_delayed_delete(struct work_struct *ws)
2482 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2483 kobject_del(&rdev->kobj);
2484 kobject_put(&rdev->kobj);
2487 static void unbind_rdev_from_array(struct md_rdev *rdev)
2489 char b[BDEVNAME_SIZE];
2491 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2492 list_del_rcu(&rdev->same_set);
2493 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2494 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2496 sysfs_remove_link(&rdev->kobj, "block");
2497 sysfs_put(rdev->sysfs_state);
2498 sysfs_put(rdev->sysfs_unack_badblocks);
2499 sysfs_put(rdev->sysfs_badblocks);
2500 rdev->sysfs_state = NULL;
2501 rdev->sysfs_unack_badblocks = NULL;
2502 rdev->sysfs_badblocks = NULL;
2503 rdev->badblocks.count = 0;
2504 /* We need to delay this, otherwise we can deadlock when
2505 * writing to 'remove' to "dev/state". We also need
2506 * to delay it due to rcu usage.
2509 INIT_WORK(&rdev->del_work, rdev_delayed_delete);
2510 kobject_get(&rdev->kobj);
2511 queue_work(md_rdev_misc_wq, &rdev->del_work);
2515 * prevent the device from being mounted, repartitioned or
2516 * otherwise reused by a RAID array (or any other kernel
2517 * subsystem), by bd_claiming the device.
2519 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2522 struct block_device *bdev;
2524 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2525 shared ? (struct md_rdev *)lock_rdev : rdev);
2527 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2528 MAJOR(dev), MINOR(dev));
2529 return PTR_ERR(bdev);
2535 static void unlock_rdev(struct md_rdev *rdev)
2537 struct block_device *bdev = rdev->bdev;
2539 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2542 void md_autodetect_dev(dev_t dev);
2544 static void export_rdev(struct md_rdev *rdev)
2546 char b[BDEVNAME_SIZE];
2548 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2549 md_rdev_clear(rdev);
2551 if (test_bit(AutoDetected, &rdev->flags))
2552 md_autodetect_dev(rdev->bdev->bd_dev);
2555 kobject_put(&rdev->kobj);
2558 void md_kick_rdev_from_array(struct md_rdev *rdev)
2560 unbind_rdev_from_array(rdev);
2563 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2565 static void export_array(struct mddev *mddev)
2567 struct md_rdev *rdev;
2569 while (!list_empty(&mddev->disks)) {
2570 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2572 md_kick_rdev_from_array(rdev);
2574 mddev->raid_disks = 0;
2575 mddev->major_version = 0;
2578 static bool set_in_sync(struct mddev *mddev)
2580 lockdep_assert_held(&mddev->lock);
2581 if (!mddev->in_sync) {
2582 mddev->sync_checkers++;
2583 spin_unlock(&mddev->lock);
2584 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2585 spin_lock(&mddev->lock);
2586 if (!mddev->in_sync &&
2587 percpu_ref_is_zero(&mddev->writes_pending)) {
2590 * Ensure ->in_sync is visible before we clear
2594 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2595 sysfs_notify_dirent_safe(mddev->sysfs_state);
2597 if (--mddev->sync_checkers == 0)
2598 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2600 if (mddev->safemode == 1)
2601 mddev->safemode = 0;
2602 return mddev->in_sync;
2605 static void sync_sbs(struct mddev *mddev, int nospares)
2607 /* Update each superblock (in-memory image), but
2608 * if we are allowed to, skip spares which already
2609 * have the right event counter, or have one earlier
2610 * (which would mean they aren't being marked as dirty
2611 * with the rest of the array)
2613 struct md_rdev *rdev;
2614 rdev_for_each(rdev, mddev) {
2615 if (rdev->sb_events == mddev->events ||
2617 rdev->raid_disk < 0 &&
2618 rdev->sb_events+1 == mddev->events)) {
2619 /* Don't update this superblock */
2620 rdev->sb_loaded = 2;
2622 sync_super(mddev, rdev);
2623 rdev->sb_loaded = 1;
2628 static bool does_sb_need_changing(struct mddev *mddev)
2630 struct md_rdev *rdev;
2631 struct mdp_superblock_1 *sb;
2634 /* Find a good rdev */
2635 rdev_for_each(rdev, mddev)
2636 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2639 /* No good device found. */
2643 sb = page_address(rdev->sb_page);
2644 /* Check if a device has become faulty or a spare become active */
2645 rdev_for_each(rdev, mddev) {
2646 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2647 /* Device activated? */
2648 if (role == 0xffff && rdev->raid_disk >=0 &&
2649 !test_bit(Faulty, &rdev->flags))
2651 /* Device turned faulty? */
2652 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2656 /* Check if any mddev parameters have changed */
2657 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2658 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2659 (mddev->layout != le32_to_cpu(sb->layout)) ||
2660 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2661 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2667 void md_update_sb(struct mddev *mddev, int force_change)
2669 struct md_rdev *rdev;
2672 int any_badblocks_changed = 0;
2677 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2682 if (mddev_is_clustered(mddev)) {
2683 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2685 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2687 ret = md_cluster_ops->metadata_update_start(mddev);
2688 /* Has someone else has updated the sb */
2689 if (!does_sb_need_changing(mddev)) {
2691 md_cluster_ops->metadata_update_cancel(mddev);
2692 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2693 BIT(MD_SB_CHANGE_DEVS) |
2694 BIT(MD_SB_CHANGE_CLEAN));
2700 * First make sure individual recovery_offsets are correct
2701 * curr_resync_completed can only be used during recovery.
2702 * During reshape/resync it might use array-addresses rather
2703 * that device addresses.
2705 rdev_for_each(rdev, mddev) {
2706 if (rdev->raid_disk >= 0 &&
2707 mddev->delta_disks >= 0 &&
2708 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2709 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2710 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2711 !test_bit(Journal, &rdev->flags) &&
2712 !test_bit(In_sync, &rdev->flags) &&
2713 mddev->curr_resync_completed > rdev->recovery_offset)
2714 rdev->recovery_offset = mddev->curr_resync_completed;
2717 if (!mddev->persistent) {
2718 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2719 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2720 if (!mddev->external) {
2721 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2722 rdev_for_each(rdev, mddev) {
2723 if (rdev->badblocks.changed) {
2724 rdev->badblocks.changed = 0;
2725 ack_all_badblocks(&rdev->badblocks);
2726 md_error(mddev, rdev);
2728 clear_bit(Blocked, &rdev->flags);
2729 clear_bit(BlockedBadBlocks, &rdev->flags);
2730 wake_up(&rdev->blocked_wait);
2733 wake_up(&mddev->sb_wait);
2737 spin_lock(&mddev->lock);
2739 mddev->utime = ktime_get_real_seconds();
2741 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2743 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2744 /* just a clean<-> dirty transition, possibly leave spares alone,
2745 * though if events isn't the right even/odd, we will have to do
2751 if (mddev->degraded)
2752 /* If the array is degraded, then skipping spares is both
2753 * dangerous and fairly pointless.
2754 * Dangerous because a device that was removed from the array
2755 * might have a event_count that still looks up-to-date,
2756 * so it can be re-added without a resync.
2757 * Pointless because if there are any spares to skip,
2758 * then a recovery will happen and soon that array won't
2759 * be degraded any more and the spare can go back to sleep then.
2763 sync_req = mddev->in_sync;
2765 /* If this is just a dirty<->clean transition, and the array is clean
2766 * and 'events' is odd, we can roll back to the previous clean state */
2768 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2769 && mddev->can_decrease_events
2770 && mddev->events != 1) {
2772 mddev->can_decrease_events = 0;
2774 /* otherwise we have to go forward and ... */
2776 mddev->can_decrease_events = nospares;
2780 * This 64-bit counter should never wrap.
2781 * Either we are in around ~1 trillion A.C., assuming
2782 * 1 reboot per second, or we have a bug...
2784 WARN_ON(mddev->events == 0);
2786 rdev_for_each(rdev, mddev) {
2787 if (rdev->badblocks.changed)
2788 any_badblocks_changed++;
2789 if (test_bit(Faulty, &rdev->flags))
2790 set_bit(FaultRecorded, &rdev->flags);
2793 sync_sbs(mddev, nospares);
2794 spin_unlock(&mddev->lock);
2796 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2797 mdname(mddev), mddev->in_sync);
2800 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2802 md_bitmap_update_sb(mddev->bitmap);
2803 rdev_for_each(rdev, mddev) {
2804 char b[BDEVNAME_SIZE];
2806 if (rdev->sb_loaded != 1)
2807 continue; /* no noise on spare devices */
2809 if (!test_bit(Faulty, &rdev->flags)) {
2810 md_super_write(mddev,rdev,
2811 rdev->sb_start, rdev->sb_size,
2813 pr_debug("md: (write) %s's sb offset: %llu\n",
2814 bdevname(rdev->bdev, b),
2815 (unsigned long long)rdev->sb_start);
2816 rdev->sb_events = mddev->events;
2817 if (rdev->badblocks.size) {
2818 md_super_write(mddev, rdev,
2819 rdev->badblocks.sector,
2820 rdev->badblocks.size << 9,
2822 rdev->badblocks.size = 0;
2826 pr_debug("md: %s (skipping faulty)\n",
2827 bdevname(rdev->bdev, b));
2829 if (mddev->level == LEVEL_MULTIPATH)
2830 /* only need to write one superblock... */
2833 if (md_super_wait(mddev) < 0)
2835 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2837 if (mddev_is_clustered(mddev) && ret == 0)
2838 md_cluster_ops->metadata_update_finish(mddev);
2840 if (mddev->in_sync != sync_req ||
2841 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2842 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2843 /* have to write it out again */
2845 wake_up(&mddev->sb_wait);
2846 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2847 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2849 rdev_for_each(rdev, mddev) {
2850 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2851 clear_bit(Blocked, &rdev->flags);
2853 if (any_badblocks_changed)
2854 ack_all_badblocks(&rdev->badblocks);
2855 clear_bit(BlockedBadBlocks, &rdev->flags);
2856 wake_up(&rdev->blocked_wait);
2859 EXPORT_SYMBOL(md_update_sb);
2861 static int add_bound_rdev(struct md_rdev *rdev)
2863 struct mddev *mddev = rdev->mddev;
2865 bool add_journal = test_bit(Journal, &rdev->flags);
2867 if (!mddev->pers->hot_remove_disk || add_journal) {
2868 /* If there is hot_add_disk but no hot_remove_disk
2869 * then added disks for geometry changes,
2870 * and should be added immediately.
2872 super_types[mddev->major_version].
2873 validate_super(mddev, rdev);
2875 mddev_suspend(mddev);
2876 err = mddev->pers->hot_add_disk(mddev, rdev);
2878 mddev_resume(mddev);
2880 md_kick_rdev_from_array(rdev);
2884 sysfs_notify_dirent_safe(rdev->sysfs_state);
2886 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2887 if (mddev->degraded)
2888 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2889 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2890 md_new_event(mddev);
2891 md_wakeup_thread(mddev->thread);
2895 /* words written to sysfs files may, or may not, be \n terminated.
2896 * We want to accept with case. For this we use cmd_match.
2898 static int cmd_match(const char *cmd, const char *str)
2900 /* See if cmd, written into a sysfs file, matches
2901 * str. They must either be the same, or cmd can
2902 * have a trailing newline
2904 while (*cmd && *str && *cmd == *str) {
2915 struct rdev_sysfs_entry {
2916 struct attribute attr;
2917 ssize_t (*show)(struct md_rdev *, char *);
2918 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2922 state_show(struct md_rdev *rdev, char *page)
2926 unsigned long flags = READ_ONCE(rdev->flags);
2928 if (test_bit(Faulty, &flags) ||
2929 (!test_bit(ExternalBbl, &flags) &&
2930 rdev->badblocks.unacked_exist))
2931 len += sprintf(page+len, "faulty%s", sep);
2932 if (test_bit(In_sync, &flags))
2933 len += sprintf(page+len, "in_sync%s", sep);
2934 if (test_bit(Journal, &flags))
2935 len += sprintf(page+len, "journal%s", sep);
2936 if (test_bit(WriteMostly, &flags))
2937 len += sprintf(page+len, "write_mostly%s", sep);
2938 if (test_bit(Blocked, &flags) ||
2939 (rdev->badblocks.unacked_exist
2940 && !test_bit(Faulty, &flags)))
2941 len += sprintf(page+len, "blocked%s", sep);
2942 if (!test_bit(Faulty, &flags) &&
2943 !test_bit(Journal, &flags) &&
2944 !test_bit(In_sync, &flags))
2945 len += sprintf(page+len, "spare%s", sep);
2946 if (test_bit(WriteErrorSeen, &flags))
2947 len += sprintf(page+len, "write_error%s", sep);
2948 if (test_bit(WantReplacement, &flags))
2949 len += sprintf(page+len, "want_replacement%s", sep);
2950 if (test_bit(Replacement, &flags))
2951 len += sprintf(page+len, "replacement%s", sep);
2952 if (test_bit(ExternalBbl, &flags))
2953 len += sprintf(page+len, "external_bbl%s", sep);
2954 if (test_bit(FailFast, &flags))
2955 len += sprintf(page+len, "failfast%s", sep);
2960 return len+sprintf(page+len, "\n");
2964 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2967 * faulty - simulates an error
2968 * remove - disconnects the device
2969 * writemostly - sets write_mostly
2970 * -writemostly - clears write_mostly
2971 * blocked - sets the Blocked flags
2972 * -blocked - clears the Blocked and possibly simulates an error
2973 * insync - sets Insync providing device isn't active
2974 * -insync - clear Insync for a device with a slot assigned,
2975 * so that it gets rebuilt based on bitmap
2976 * write_error - sets WriteErrorSeen
2977 * -write_error - clears WriteErrorSeen
2978 * {,-}failfast - set/clear FailFast
2981 struct mddev *mddev = rdev->mddev;
2983 bool need_update_sb = false;
2985 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2986 md_error(rdev->mddev, rdev);
2987 if (test_bit(Faulty, &rdev->flags))
2991 } else if (cmd_match(buf, "remove")) {
2992 if (rdev->mddev->pers) {
2993 clear_bit(Blocked, &rdev->flags);
2994 remove_and_add_spares(rdev->mddev, rdev);
2996 if (rdev->raid_disk >= 0)
3000 if (mddev_is_clustered(mddev))
3001 err = md_cluster_ops->remove_disk(mddev, rdev);
3004 md_kick_rdev_from_array(rdev);
3006 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3007 md_wakeup_thread(mddev->thread);
3009 md_new_event(mddev);
3012 } else if (cmd_match(buf, "writemostly")) {
3013 set_bit(WriteMostly, &rdev->flags);
3014 mddev_create_serial_pool(rdev->mddev, rdev, false);
3015 need_update_sb = true;
3017 } else if (cmd_match(buf, "-writemostly")) {
3018 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3019 clear_bit(WriteMostly, &rdev->flags);
3020 need_update_sb = true;
3022 } else if (cmd_match(buf, "blocked")) {
3023 set_bit(Blocked, &rdev->flags);
3025 } else if (cmd_match(buf, "-blocked")) {
3026 if (!test_bit(Faulty, &rdev->flags) &&
3027 !test_bit(ExternalBbl, &rdev->flags) &&
3028 rdev->badblocks.unacked_exist) {
3029 /* metadata handler doesn't understand badblocks,
3030 * so we need to fail the device
3032 md_error(rdev->mddev, rdev);
3034 clear_bit(Blocked, &rdev->flags);
3035 clear_bit(BlockedBadBlocks, &rdev->flags);
3036 wake_up(&rdev->blocked_wait);
3037 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3038 md_wakeup_thread(rdev->mddev->thread);
3041 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3042 set_bit(In_sync, &rdev->flags);
3044 } else if (cmd_match(buf, "failfast")) {
3045 set_bit(FailFast, &rdev->flags);
3046 need_update_sb = true;
3048 } else if (cmd_match(buf, "-failfast")) {
3049 clear_bit(FailFast, &rdev->flags);
3050 need_update_sb = true;
3052 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3053 !test_bit(Journal, &rdev->flags)) {
3054 if (rdev->mddev->pers == NULL) {
3055 clear_bit(In_sync, &rdev->flags);
3056 rdev->saved_raid_disk = rdev->raid_disk;
3057 rdev->raid_disk = -1;
3060 } else if (cmd_match(buf, "write_error")) {
3061 set_bit(WriteErrorSeen, &rdev->flags);
3063 } else if (cmd_match(buf, "-write_error")) {
3064 clear_bit(WriteErrorSeen, &rdev->flags);
3066 } else if (cmd_match(buf, "want_replacement")) {
3067 /* Any non-spare device that is not a replacement can
3068 * become want_replacement at any time, but we then need to
3069 * check if recovery is needed.
3071 if (rdev->raid_disk >= 0 &&
3072 !test_bit(Journal, &rdev->flags) &&
3073 !test_bit(Replacement, &rdev->flags))
3074 set_bit(WantReplacement, &rdev->flags);
3075 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3076 md_wakeup_thread(rdev->mddev->thread);
3078 } else if (cmd_match(buf, "-want_replacement")) {
3079 /* Clearing 'want_replacement' is always allowed.
3080 * Once replacements starts it is too late though.
3083 clear_bit(WantReplacement, &rdev->flags);
3084 } else if (cmd_match(buf, "replacement")) {
3085 /* Can only set a device as a replacement when array has not
3086 * yet been started. Once running, replacement is automatic
3087 * from spares, or by assigning 'slot'.
3089 if (rdev->mddev->pers)
3092 set_bit(Replacement, &rdev->flags);
3095 } else if (cmd_match(buf, "-replacement")) {
3096 /* Similarly, can only clear Replacement before start */
3097 if (rdev->mddev->pers)
3100 clear_bit(Replacement, &rdev->flags);
3103 } else if (cmd_match(buf, "re-add")) {
3104 if (!rdev->mddev->pers)
3106 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3107 rdev->saved_raid_disk >= 0) {
3108 /* clear_bit is performed _after_ all the devices
3109 * have their local Faulty bit cleared. If any writes
3110 * happen in the meantime in the local node, they
3111 * will land in the local bitmap, which will be synced
3112 * by this node eventually
3114 if (!mddev_is_clustered(rdev->mddev) ||
3115 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3116 clear_bit(Faulty, &rdev->flags);
3117 err = add_bound_rdev(rdev);
3121 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3122 set_bit(ExternalBbl, &rdev->flags);
3123 rdev->badblocks.shift = 0;
3125 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3126 clear_bit(ExternalBbl, &rdev->flags);
3130 md_update_sb(mddev, 1);
3132 sysfs_notify_dirent_safe(rdev->sysfs_state);
3133 return err ? err : len;
3135 static struct rdev_sysfs_entry rdev_state =
3136 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3139 errors_show(struct md_rdev *rdev, char *page)
3141 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3145 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3150 rv = kstrtouint(buf, 10, &n);
3153 atomic_set(&rdev->corrected_errors, n);
3156 static struct rdev_sysfs_entry rdev_errors =
3157 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3160 slot_show(struct md_rdev *rdev, char *page)
3162 if (test_bit(Journal, &rdev->flags))
3163 return sprintf(page, "journal\n");
3164 else if (rdev->raid_disk < 0)
3165 return sprintf(page, "none\n");
3167 return sprintf(page, "%d\n", rdev->raid_disk);
3171 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3176 if (test_bit(Journal, &rdev->flags))
3178 if (strncmp(buf, "none", 4)==0)
3181 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3185 if (rdev->mddev->pers && slot == -1) {
3186 /* Setting 'slot' on an active array requires also
3187 * updating the 'rd%d' link, and communicating
3188 * with the personality with ->hot_*_disk.
3189 * For now we only support removing
3190 * failed/spare devices. This normally happens automatically,
3191 * but not when the metadata is externally managed.
3193 if (rdev->raid_disk == -1)
3195 /* personality does all needed checks */
3196 if (rdev->mddev->pers->hot_remove_disk == NULL)
3198 clear_bit(Blocked, &rdev->flags);
3199 remove_and_add_spares(rdev->mddev, rdev);
3200 if (rdev->raid_disk >= 0)
3202 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3203 md_wakeup_thread(rdev->mddev->thread);
3204 } else if (rdev->mddev->pers) {
3205 /* Activating a spare .. or possibly reactivating
3206 * if we ever get bitmaps working here.
3210 if (rdev->raid_disk != -1)
3213 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3216 if (rdev->mddev->pers->hot_add_disk == NULL)
3219 if (slot >= rdev->mddev->raid_disks &&
3220 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3223 rdev->raid_disk = slot;
3224 if (test_bit(In_sync, &rdev->flags))
3225 rdev->saved_raid_disk = slot;
3227 rdev->saved_raid_disk = -1;
3228 clear_bit(In_sync, &rdev->flags);
3229 clear_bit(Bitmap_sync, &rdev->flags);
3230 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3232 rdev->raid_disk = -1;
3235 sysfs_notify_dirent_safe(rdev->sysfs_state);
3236 /* failure here is OK */;
3237 sysfs_link_rdev(rdev->mddev, rdev);
3238 /* don't wakeup anyone, leave that to userspace. */
3240 if (slot >= rdev->mddev->raid_disks &&
3241 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3243 rdev->raid_disk = slot;
3244 /* assume it is working */
3245 clear_bit(Faulty, &rdev->flags);
3246 clear_bit(WriteMostly, &rdev->flags);
3247 set_bit(In_sync, &rdev->flags);
3248 sysfs_notify_dirent_safe(rdev->sysfs_state);
3253 static struct rdev_sysfs_entry rdev_slot =
3254 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3257 offset_show(struct md_rdev *rdev, char *page)
3259 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3263 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3265 unsigned long long offset;
3266 if (kstrtoull(buf, 10, &offset) < 0)
3268 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3270 if (rdev->sectors && rdev->mddev->external)
3271 /* Must set offset before size, so overlap checks
3274 rdev->data_offset = offset;
3275 rdev->new_data_offset = offset;
3279 static struct rdev_sysfs_entry rdev_offset =
3280 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3282 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3284 return sprintf(page, "%llu\n",
3285 (unsigned long long)rdev->new_data_offset);
3288 static ssize_t new_offset_store(struct md_rdev *rdev,
3289 const char *buf, size_t len)
3291 unsigned long long new_offset;
3292 struct mddev *mddev = rdev->mddev;
3294 if (kstrtoull(buf, 10, &new_offset) < 0)
3297 if (mddev->sync_thread ||
3298 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3300 if (new_offset == rdev->data_offset)
3301 /* reset is always permitted */
3303 else if (new_offset > rdev->data_offset) {
3304 /* must not push array size beyond rdev_sectors */
3305 if (new_offset - rdev->data_offset
3306 + mddev->dev_sectors > rdev->sectors)
3309 /* Metadata worries about other space details. */
3311 /* decreasing the offset is inconsistent with a backwards
3314 if (new_offset < rdev->data_offset &&
3315 mddev->reshape_backwards)
3317 /* Increasing offset is inconsistent with forwards
3318 * reshape. reshape_direction should be set to
3319 * 'backwards' first.
3321 if (new_offset > rdev->data_offset &&
3322 !mddev->reshape_backwards)
3325 if (mddev->pers && mddev->persistent &&
3326 !super_types[mddev->major_version]
3327 .allow_new_offset(rdev, new_offset))
3329 rdev->new_data_offset = new_offset;
3330 if (new_offset > rdev->data_offset)
3331 mddev->reshape_backwards = 1;
3332 else if (new_offset < rdev->data_offset)
3333 mddev->reshape_backwards = 0;
3337 static struct rdev_sysfs_entry rdev_new_offset =
3338 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3341 rdev_size_show(struct md_rdev *rdev, char *page)
3343 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3346 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3348 /* check if two start/length pairs overlap */
3356 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3358 unsigned long long blocks;
3361 if (kstrtoull(buf, 10, &blocks) < 0)
3364 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3365 return -EINVAL; /* sector conversion overflow */
3368 if (new != blocks * 2)
3369 return -EINVAL; /* unsigned long long to sector_t overflow */
3376 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3378 struct mddev *my_mddev = rdev->mddev;
3379 sector_t oldsectors = rdev->sectors;
3382 if (test_bit(Journal, &rdev->flags))
3384 if (strict_blocks_to_sectors(buf, §ors) < 0)
3386 if (rdev->data_offset != rdev->new_data_offset)
3387 return -EINVAL; /* too confusing */
3388 if (my_mddev->pers && rdev->raid_disk >= 0) {
3389 if (my_mddev->persistent) {
3390 sectors = super_types[my_mddev->major_version].
3391 rdev_size_change(rdev, sectors);
3394 } else if (!sectors)
3395 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3397 if (!my_mddev->pers->resize)
3398 /* Cannot change size for RAID0 or Linear etc */
3401 if (sectors < my_mddev->dev_sectors)
3402 return -EINVAL; /* component must fit device */
3404 rdev->sectors = sectors;
3405 if (sectors > oldsectors && my_mddev->external) {
3406 /* Need to check that all other rdevs with the same
3407 * ->bdev do not overlap. 'rcu' is sufficient to walk
3408 * the rdev lists safely.
3409 * This check does not provide a hard guarantee, it
3410 * just helps avoid dangerous mistakes.
3412 struct mddev *mddev;
3414 struct list_head *tmp;
3417 for_each_mddev(mddev, tmp) {
3418 struct md_rdev *rdev2;
3420 rdev_for_each(rdev2, mddev)
3421 if (rdev->bdev == rdev2->bdev &&
3423 overlaps(rdev->data_offset, rdev->sectors,
3436 /* Someone else could have slipped in a size
3437 * change here, but doing so is just silly.
3438 * We put oldsectors back because we *know* it is
3439 * safe, and trust userspace not to race with
3442 rdev->sectors = oldsectors;
3449 static struct rdev_sysfs_entry rdev_size =
3450 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3452 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3454 unsigned long long recovery_start = rdev->recovery_offset;
3456 if (test_bit(In_sync, &rdev->flags) ||
3457 recovery_start == MaxSector)
3458 return sprintf(page, "none\n");
3460 return sprintf(page, "%llu\n", recovery_start);
3463 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3465 unsigned long long recovery_start;
3467 if (cmd_match(buf, "none"))
3468 recovery_start = MaxSector;
3469 else if (kstrtoull(buf, 10, &recovery_start))
3472 if (rdev->mddev->pers &&
3473 rdev->raid_disk >= 0)
3476 rdev->recovery_offset = recovery_start;
3477 if (recovery_start == MaxSector)
3478 set_bit(In_sync, &rdev->flags);
3480 clear_bit(In_sync, &rdev->flags);
3484 static struct rdev_sysfs_entry rdev_recovery_start =
3485 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3487 /* sysfs access to bad-blocks list.
3488 * We present two files.
3489 * 'bad-blocks' lists sector numbers and lengths of ranges that
3490 * are recorded as bad. The list is truncated to fit within
3491 * the one-page limit of sysfs.
3492 * Writing "sector length" to this file adds an acknowledged
3494 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3495 * been acknowledged. Writing to this file adds bad blocks
3496 * without acknowledging them. This is largely for testing.
3498 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3500 return badblocks_show(&rdev->badblocks, page, 0);
3502 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3504 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3505 /* Maybe that ack was all we needed */
3506 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3507 wake_up(&rdev->blocked_wait);
3510 static struct rdev_sysfs_entry rdev_bad_blocks =
3511 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3513 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3515 return badblocks_show(&rdev->badblocks, page, 1);
3517 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3519 return badblocks_store(&rdev->badblocks, page, len, 1);
3521 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3522 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3525 ppl_sector_show(struct md_rdev *rdev, char *page)
3527 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3531 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3533 unsigned long long sector;
3535 if (kstrtoull(buf, 10, §or) < 0)
3537 if (sector != (sector_t)sector)
3540 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3541 rdev->raid_disk >= 0)
3544 if (rdev->mddev->persistent) {
3545 if (rdev->mddev->major_version == 0)
3547 if ((sector > rdev->sb_start &&
3548 sector - rdev->sb_start > S16_MAX) ||
3549 (sector < rdev->sb_start &&
3550 rdev->sb_start - sector > -S16_MIN))
3552 rdev->ppl.offset = sector - rdev->sb_start;
3553 } else if (!rdev->mddev->external) {
3556 rdev->ppl.sector = sector;
3560 static struct rdev_sysfs_entry rdev_ppl_sector =
3561 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3564 ppl_size_show(struct md_rdev *rdev, char *page)
3566 return sprintf(page, "%u\n", rdev->ppl.size);
3570 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3574 if (kstrtouint(buf, 10, &size) < 0)
3577 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3578 rdev->raid_disk >= 0)
3581 if (rdev->mddev->persistent) {
3582 if (rdev->mddev->major_version == 0)
3586 } else if (!rdev->mddev->external) {
3589 rdev->ppl.size = size;
3593 static struct rdev_sysfs_entry rdev_ppl_size =
3594 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3596 static struct attribute *rdev_default_attrs[] = {
3601 &rdev_new_offset.attr,
3603 &rdev_recovery_start.attr,
3604 &rdev_bad_blocks.attr,
3605 &rdev_unack_bad_blocks.attr,
3606 &rdev_ppl_sector.attr,
3607 &rdev_ppl_size.attr,
3611 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3613 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3614 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3620 return entry->show(rdev, page);
3624 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3625 const char *page, size_t length)
3627 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3628 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3630 struct mddev *mddev = rdev->mddev;
3634 if (!capable(CAP_SYS_ADMIN))
3636 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3638 if (rdev->mddev == NULL)
3641 rv = entry->store(rdev, page, length);
3642 mddev_unlock(mddev);
3647 static void rdev_free(struct kobject *ko)
3649 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3652 static const struct sysfs_ops rdev_sysfs_ops = {
3653 .show = rdev_attr_show,
3654 .store = rdev_attr_store,
3656 static struct kobj_type rdev_ktype = {
3657 .release = rdev_free,
3658 .sysfs_ops = &rdev_sysfs_ops,
3659 .default_attrs = rdev_default_attrs,
3662 int md_rdev_init(struct md_rdev *rdev)
3665 rdev->saved_raid_disk = -1;
3666 rdev->raid_disk = -1;
3668 rdev->data_offset = 0;
3669 rdev->new_data_offset = 0;
3670 rdev->sb_events = 0;
3671 rdev->last_read_error = 0;
3672 rdev->sb_loaded = 0;
3673 rdev->bb_page = NULL;
3674 atomic_set(&rdev->nr_pending, 0);
3675 atomic_set(&rdev->read_errors, 0);
3676 atomic_set(&rdev->corrected_errors, 0);
3678 INIT_LIST_HEAD(&rdev->same_set);
3679 init_waitqueue_head(&rdev->blocked_wait);
3681 /* Add space to store bad block list.
3682 * This reserves the space even on arrays where it cannot
3683 * be used - I wonder if that matters
3685 return badblocks_init(&rdev->badblocks, 0);
3687 EXPORT_SYMBOL_GPL(md_rdev_init);
3689 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3691 * mark the device faulty if:
3693 * - the device is nonexistent (zero size)
3694 * - the device has no valid superblock
3696 * a faulty rdev _never_ has rdev->sb set.
3698 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3700 char b[BDEVNAME_SIZE];
3702 struct md_rdev *rdev;
3705 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3707 return ERR_PTR(-ENOMEM);
3709 err = md_rdev_init(rdev);
3712 err = alloc_disk_sb(rdev);
3716 err = lock_rdev(rdev, newdev, super_format == -2);
3720 kobject_init(&rdev->kobj, &rdev_ktype);
3722 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3724 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3725 bdevname(rdev->bdev,b));
3730 if (super_format >= 0) {
3731 err = super_types[super_format].
3732 load_super(rdev, NULL, super_minor);
3733 if (err == -EINVAL) {
3734 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3735 bdevname(rdev->bdev,b),
3736 super_format, super_minor);
3740 pr_warn("md: could not read %s's sb, not importing!\n",
3741 bdevname(rdev->bdev,b));
3751 md_rdev_clear(rdev);
3753 return ERR_PTR(err);
3757 * Check a full RAID array for plausibility
3760 static int analyze_sbs(struct mddev *mddev)
3763 struct md_rdev *rdev, *freshest, *tmp;
3764 char b[BDEVNAME_SIZE];
3767 rdev_for_each_safe(rdev, tmp, mddev)
3768 switch (super_types[mddev->major_version].
3769 load_super(rdev, freshest, mddev->minor_version)) {
3776 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3777 bdevname(rdev->bdev,b));
3778 md_kick_rdev_from_array(rdev);
3781 /* Cannot find a valid fresh disk */
3783 pr_warn("md: cannot find a valid disk\n");
3787 super_types[mddev->major_version].
3788 validate_super(mddev, freshest);
3791 rdev_for_each_safe(rdev, tmp, mddev) {
3792 if (mddev->max_disks &&
3793 (rdev->desc_nr >= mddev->max_disks ||
3794 i > mddev->max_disks)) {
3795 pr_warn("md: %s: %s: only %d devices permitted\n",
3796 mdname(mddev), bdevname(rdev->bdev, b),
3798 md_kick_rdev_from_array(rdev);
3801 if (rdev != freshest) {
3802 if (super_types[mddev->major_version].
3803 validate_super(mddev, rdev)) {
3804 pr_warn("md: kicking non-fresh %s from array!\n",
3805 bdevname(rdev->bdev,b));
3806 md_kick_rdev_from_array(rdev);
3810 if (mddev->level == LEVEL_MULTIPATH) {
3811 rdev->desc_nr = i++;
3812 rdev->raid_disk = rdev->desc_nr;
3813 set_bit(In_sync, &rdev->flags);
3814 } else if (rdev->raid_disk >=
3815 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3816 !test_bit(Journal, &rdev->flags)) {
3817 rdev->raid_disk = -1;
3818 clear_bit(In_sync, &rdev->flags);
3825 /* Read a fixed-point number.
3826 * Numbers in sysfs attributes should be in "standard" units where
3827 * possible, so time should be in seconds.
3828 * However we internally use a a much smaller unit such as
3829 * milliseconds or jiffies.
3830 * This function takes a decimal number with a possible fractional
3831 * component, and produces an integer which is the result of
3832 * multiplying that number by 10^'scale'.
3833 * all without any floating-point arithmetic.
3835 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3837 unsigned long result = 0;
3839 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3842 else if (decimals < scale) {
3845 result = result * 10 + value;
3857 *res = result * int_pow(10, scale - decimals);
3862 safe_delay_show(struct mddev *mddev, char *page)
3864 int msec = (mddev->safemode_delay*1000)/HZ;
3865 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3868 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3872 if (mddev_is_clustered(mddev)) {
3873 pr_warn("md: Safemode is disabled for clustered mode\n");
3877 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3880 mddev->safemode_delay = 0;
3882 unsigned long old_delay = mddev->safemode_delay;
3883 unsigned long new_delay = (msec*HZ)/1000;
3887 mddev->safemode_delay = new_delay;
3888 if (new_delay < old_delay || old_delay == 0)
3889 mod_timer(&mddev->safemode_timer, jiffies+1);
3893 static struct md_sysfs_entry md_safe_delay =
3894 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3897 level_show(struct mddev *mddev, char *page)
3899 struct md_personality *p;
3901 spin_lock(&mddev->lock);
3904 ret = sprintf(page, "%s\n", p->name);
3905 else if (mddev->clevel[0])
3906 ret = sprintf(page, "%s\n", mddev->clevel);
3907 else if (mddev->level != LEVEL_NONE)
3908 ret = sprintf(page, "%d\n", mddev->level);
3911 spin_unlock(&mddev->lock);
3916 level_store(struct mddev *mddev, const char *buf, size_t len)
3921 struct md_personality *pers, *oldpers;
3923 void *priv, *oldpriv;
3924 struct md_rdev *rdev;
3926 if (slen == 0 || slen >= sizeof(clevel))
3929 rv = mddev_lock(mddev);
3933 if (mddev->pers == NULL) {
3934 strncpy(mddev->clevel, buf, slen);
3935 if (mddev->clevel[slen-1] == '\n')
3937 mddev->clevel[slen] = 0;
3938 mddev->level = LEVEL_NONE;
3946 /* request to change the personality. Need to ensure:
3947 * - array is not engaged in resync/recovery/reshape
3948 * - old personality can be suspended
3949 * - new personality will access other array.
3953 if (mddev->sync_thread ||
3954 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3955 mddev->reshape_position != MaxSector ||
3956 mddev->sysfs_active)
3960 if (!mddev->pers->quiesce) {
3961 pr_warn("md: %s: %s does not support online personality change\n",
3962 mdname(mddev), mddev->pers->name);
3966 /* Now find the new personality */
3967 strncpy(clevel, buf, slen);
3968 if (clevel[slen-1] == '\n')
3971 if (kstrtol(clevel, 10, &level))
3974 if (request_module("md-%s", clevel) != 0)
3975 request_module("md-level-%s", clevel);
3976 spin_lock(&pers_lock);
3977 pers = find_pers(level, clevel);
3978 if (!pers || !try_module_get(pers->owner)) {
3979 spin_unlock(&pers_lock);
3980 pr_warn("md: personality %s not loaded\n", clevel);
3984 spin_unlock(&pers_lock);
3986 if (pers == mddev->pers) {
3987 /* Nothing to do! */
3988 module_put(pers->owner);
3992 if (!pers->takeover) {
3993 module_put(pers->owner);
3994 pr_warn("md: %s: %s does not support personality takeover\n",
3995 mdname(mddev), clevel);
4000 rdev_for_each(rdev, mddev)
4001 rdev->new_raid_disk = rdev->raid_disk;
4003 /* ->takeover must set new_* and/or delta_disks
4004 * if it succeeds, and may set them when it fails.
4006 priv = pers->takeover(mddev);
4008 mddev->new_level = mddev->level;
4009 mddev->new_layout = mddev->layout;
4010 mddev->new_chunk_sectors = mddev->chunk_sectors;
4011 mddev->raid_disks -= mddev->delta_disks;
4012 mddev->delta_disks = 0;
4013 mddev->reshape_backwards = 0;
4014 module_put(pers->owner);
4015 pr_warn("md: %s: %s would not accept array\n",
4016 mdname(mddev), clevel);
4021 /* Looks like we have a winner */
4022 mddev_suspend(mddev);
4023 mddev_detach(mddev);
4025 spin_lock(&mddev->lock);
4026 oldpers = mddev->pers;
4027 oldpriv = mddev->private;
4029 mddev->private = priv;
4030 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4031 mddev->level = mddev->new_level;
4032 mddev->layout = mddev->new_layout;
4033 mddev->chunk_sectors = mddev->new_chunk_sectors;
4034 mddev->delta_disks = 0;
4035 mddev->reshape_backwards = 0;
4036 mddev->degraded = 0;
4037 spin_unlock(&mddev->lock);
4039 if (oldpers->sync_request == NULL &&
4041 /* We are converting from a no-redundancy array
4042 * to a redundancy array and metadata is managed
4043 * externally so we need to be sure that writes
4044 * won't block due to a need to transition
4046 * until external management is started.
4049 mddev->safemode_delay = 0;
4050 mddev->safemode = 0;
4053 oldpers->free(mddev, oldpriv);
4055 if (oldpers->sync_request == NULL &&
4056 pers->sync_request != NULL) {
4057 /* need to add the md_redundancy_group */
4058 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4059 pr_warn("md: cannot register extra attributes for %s\n",
4061 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4062 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4063 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4065 if (oldpers->sync_request != NULL &&
4066 pers->sync_request == NULL) {
4067 /* need to remove the md_redundancy_group */
4068 if (mddev->to_remove == NULL)
4069 mddev->to_remove = &md_redundancy_group;
4072 module_put(oldpers->owner);
4074 rdev_for_each(rdev, mddev) {
4075 if (rdev->raid_disk < 0)
4077 if (rdev->new_raid_disk >= mddev->raid_disks)
4078 rdev->new_raid_disk = -1;
4079 if (rdev->new_raid_disk == rdev->raid_disk)
4081 sysfs_unlink_rdev(mddev, rdev);
4083 rdev_for_each(rdev, mddev) {
4084 if (rdev->raid_disk < 0)
4086 if (rdev->new_raid_disk == rdev->raid_disk)
4088 rdev->raid_disk = rdev->new_raid_disk;
4089 if (rdev->raid_disk < 0)
4090 clear_bit(In_sync, &rdev->flags);
4092 if (sysfs_link_rdev(mddev, rdev))
4093 pr_warn("md: cannot register rd%d for %s after level change\n",
4094 rdev->raid_disk, mdname(mddev));
4098 if (pers->sync_request == NULL) {
4099 /* this is now an array without redundancy, so
4100 * it must always be in_sync
4103 del_timer_sync(&mddev->safemode_timer);
4105 blk_set_stacking_limits(&mddev->queue->limits);
4107 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4108 mddev_resume(mddev);
4110 md_update_sb(mddev, 1);
4111 sysfs_notify_dirent_safe(mddev->sysfs_level);
4112 md_new_event(mddev);
4115 mddev_unlock(mddev);
4119 static struct md_sysfs_entry md_level =
4120 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4123 layout_show(struct mddev *mddev, char *page)
4125 /* just a number, not meaningful for all levels */
4126 if (mddev->reshape_position != MaxSector &&
4127 mddev->layout != mddev->new_layout)
4128 return sprintf(page, "%d (%d)\n",
4129 mddev->new_layout, mddev->layout);
4130 return sprintf(page, "%d\n", mddev->layout);
4134 layout_store(struct mddev *mddev, const char *buf, size_t len)
4139 err = kstrtouint(buf, 10, &n);
4142 err = mddev_lock(mddev);
4147 if (mddev->pers->check_reshape == NULL)
4152 mddev->new_layout = n;
4153 err = mddev->pers->check_reshape(mddev);
4155 mddev->new_layout = mddev->layout;
4158 mddev->new_layout = n;
4159 if (mddev->reshape_position == MaxSector)
4162 mddev_unlock(mddev);
4165 static struct md_sysfs_entry md_layout =
4166 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4169 raid_disks_show(struct mddev *mddev, char *page)
4171 if (mddev->raid_disks == 0)
4173 if (mddev->reshape_position != MaxSector &&
4174 mddev->delta_disks != 0)
4175 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4176 mddev->raid_disks - mddev->delta_disks);
4177 return sprintf(page, "%d\n", mddev->raid_disks);
4180 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4183 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4188 err = kstrtouint(buf, 10, &n);
4192 err = mddev_lock(mddev);
4196 err = update_raid_disks(mddev, n);
4197 else if (mddev->reshape_position != MaxSector) {
4198 struct md_rdev *rdev;
4199 int olddisks = mddev->raid_disks - mddev->delta_disks;
4202 rdev_for_each(rdev, mddev) {
4204 rdev->data_offset < rdev->new_data_offset)
4207 rdev->data_offset > rdev->new_data_offset)
4211 mddev->delta_disks = n - olddisks;
4212 mddev->raid_disks = n;
4213 mddev->reshape_backwards = (mddev->delta_disks < 0);
4215 mddev->raid_disks = n;
4217 mddev_unlock(mddev);
4218 return err ? err : len;
4220 static struct md_sysfs_entry md_raid_disks =
4221 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4224 uuid_show(struct mddev *mddev, char *page)
4226 return sprintf(page, "%pU\n", mddev->uuid);
4228 static struct md_sysfs_entry md_uuid =
4229 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4232 chunk_size_show(struct mddev *mddev, char *page)
4234 if (mddev->reshape_position != MaxSector &&
4235 mddev->chunk_sectors != mddev->new_chunk_sectors)
4236 return sprintf(page, "%d (%d)\n",
4237 mddev->new_chunk_sectors << 9,
4238 mddev->chunk_sectors << 9);
4239 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4243 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4248 err = kstrtoul(buf, 10, &n);
4252 err = mddev_lock(mddev);
4256 if (mddev->pers->check_reshape == NULL)
4261 mddev->new_chunk_sectors = n >> 9;
4262 err = mddev->pers->check_reshape(mddev);
4264 mddev->new_chunk_sectors = mddev->chunk_sectors;
4267 mddev->new_chunk_sectors = n >> 9;
4268 if (mddev->reshape_position == MaxSector)
4269 mddev->chunk_sectors = n >> 9;
4271 mddev_unlock(mddev);
4274 static struct md_sysfs_entry md_chunk_size =
4275 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4278 resync_start_show(struct mddev *mddev, char *page)
4280 if (mddev->recovery_cp == MaxSector)
4281 return sprintf(page, "none\n");
4282 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4286 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4288 unsigned long long n;
4291 if (cmd_match(buf, "none"))
4294 err = kstrtoull(buf, 10, &n);
4297 if (n != (sector_t)n)
4301 err = mddev_lock(mddev);
4304 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4308 mddev->recovery_cp = n;
4310 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4312 mddev_unlock(mddev);
4315 static struct md_sysfs_entry md_resync_start =
4316 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4317 resync_start_show, resync_start_store);
4320 * The array state can be:
4323 * No devices, no size, no level
4324 * Equivalent to STOP_ARRAY ioctl
4326 * May have some settings, but array is not active
4327 * all IO results in error
4328 * When written, doesn't tear down array, but just stops it
4329 * suspended (not supported yet)
4330 * All IO requests will block. The array can be reconfigured.
4331 * Writing this, if accepted, will block until array is quiescent
4333 * no resync can happen. no superblocks get written.
4334 * write requests fail
4336 * like readonly, but behaves like 'clean' on a write request.
4338 * clean - no pending writes, but otherwise active.
4339 * When written to inactive array, starts without resync
4340 * If a write request arrives then
4341 * if metadata is known, mark 'dirty' and switch to 'active'.
4342 * if not known, block and switch to write-pending
4343 * If written to an active array that has pending writes, then fails.
4345 * fully active: IO and resync can be happening.
4346 * When written to inactive array, starts with resync
4349 * clean, but writes are blocked waiting for 'active' to be written.
4352 * like active, but no writes have been seen for a while (100msec).
4355 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4356 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4357 * when a member is gone, so this state will at least alert the
4358 * user that something is wrong.
4360 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4361 write_pending, active_idle, broken, bad_word};
4362 static char *array_states[] = {
4363 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4364 "write-pending", "active-idle", "broken", NULL };
4366 static int match_word(const char *word, char **list)
4369 for (n=0; list[n]; n++)
4370 if (cmd_match(word, list[n]))
4376 array_state_show(struct mddev *mddev, char *page)
4378 enum array_state st = inactive;
4380 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4389 spin_lock(&mddev->lock);
4390 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4392 else if (mddev->in_sync)
4394 else if (mddev->safemode)
4398 spin_unlock(&mddev->lock);
4401 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4404 if (list_empty(&mddev->disks) &&
4405 mddev->raid_disks == 0 &&
4406 mddev->dev_sectors == 0)
4411 return sprintf(page, "%s\n", array_states[st]);
4414 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4415 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4416 static int restart_array(struct mddev *mddev);
4419 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4422 enum array_state st = match_word(buf, array_states);
4424 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4425 /* don't take reconfig_mutex when toggling between
4428 spin_lock(&mddev->lock);
4430 restart_array(mddev);
4431 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4432 md_wakeup_thread(mddev->thread);
4433 wake_up(&mddev->sb_wait);
4434 } else /* st == clean */ {
4435 restart_array(mddev);
4436 if (!set_in_sync(mddev))
4440 sysfs_notify_dirent_safe(mddev->sysfs_state);
4441 spin_unlock(&mddev->lock);
4444 err = mddev_lock(mddev);
4452 /* stopping an active array */
4453 err = do_md_stop(mddev, 0, NULL);
4456 /* stopping an active array */
4458 err = do_md_stop(mddev, 2, NULL);
4460 err = 0; /* already inactive */
4463 break; /* not supported yet */
4466 err = md_set_readonly(mddev, NULL);
4469 set_disk_ro(mddev->gendisk, 1);
4470 err = do_md_run(mddev);
4476 err = md_set_readonly(mddev, NULL);
4477 else if (mddev->ro == 1)
4478 err = restart_array(mddev);
4481 set_disk_ro(mddev->gendisk, 0);
4485 err = do_md_run(mddev);
4490 err = restart_array(mddev);
4493 spin_lock(&mddev->lock);
4494 if (!set_in_sync(mddev))
4496 spin_unlock(&mddev->lock);
4502 err = restart_array(mddev);
4505 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4506 wake_up(&mddev->sb_wait);
4510 set_disk_ro(mddev->gendisk, 0);
4511 err = do_md_run(mddev);
4517 /* these cannot be set */
4522 if (mddev->hold_active == UNTIL_IOCTL)
4523 mddev->hold_active = 0;
4524 sysfs_notify_dirent_safe(mddev->sysfs_state);
4526 mddev_unlock(mddev);
4529 static struct md_sysfs_entry md_array_state =
4530 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4533 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4534 return sprintf(page, "%d\n",
4535 atomic_read(&mddev->max_corr_read_errors));
4539 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4544 rv = kstrtouint(buf, 10, &n);
4547 atomic_set(&mddev->max_corr_read_errors, n);
4551 static struct md_sysfs_entry max_corr_read_errors =
4552 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4553 max_corrected_read_errors_store);
4556 null_show(struct mddev *mddev, char *page)
4561 /* need to ensure rdev_delayed_delete() has completed */
4562 static void flush_rdev_wq(struct mddev *mddev)
4564 struct md_rdev *rdev;
4567 rdev_for_each_rcu(rdev, mddev)
4568 if (work_pending(&rdev->del_work)) {
4569 flush_workqueue(md_rdev_misc_wq);
4576 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4578 /* buf must be %d:%d\n? giving major and minor numbers */
4579 /* The new device is added to the array.
4580 * If the array has a persistent superblock, we read the
4581 * superblock to initialise info and check validity.
4582 * Otherwise, only checking done is that in bind_rdev_to_array,
4583 * which mainly checks size.
4586 int major = simple_strtoul(buf, &e, 10);
4589 struct md_rdev *rdev;
4592 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4594 minor = simple_strtoul(e+1, &e, 10);
4595 if (*e && *e != '\n')
4597 dev = MKDEV(major, minor);
4598 if (major != MAJOR(dev) ||
4599 minor != MINOR(dev))
4602 flush_rdev_wq(mddev);
4603 err = mddev_lock(mddev);
4606 if (mddev->persistent) {
4607 rdev = md_import_device(dev, mddev->major_version,
4608 mddev->minor_version);
4609 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4610 struct md_rdev *rdev0
4611 = list_entry(mddev->disks.next,
4612 struct md_rdev, same_set);
4613 err = super_types[mddev->major_version]
4614 .load_super(rdev, rdev0, mddev->minor_version);
4618 } else if (mddev->external)
4619 rdev = md_import_device(dev, -2, -1);
4621 rdev = md_import_device(dev, -1, -1);
4624 mddev_unlock(mddev);
4625 return PTR_ERR(rdev);
4627 err = bind_rdev_to_array(rdev, mddev);
4631 mddev_unlock(mddev);
4633 md_new_event(mddev);
4634 return err ? err : len;
4637 static struct md_sysfs_entry md_new_device =
4638 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4641 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4644 unsigned long chunk, end_chunk;
4647 err = mddev_lock(mddev);
4652 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4654 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4655 if (buf == end) break;
4656 if (*end == '-') { /* range */
4658 end_chunk = simple_strtoul(buf, &end, 0);
4659 if (buf == end) break;
4661 if (*end && !isspace(*end)) break;
4662 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4663 buf = skip_spaces(end);
4665 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4667 mddev_unlock(mddev);
4671 static struct md_sysfs_entry md_bitmap =
4672 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4675 size_show(struct mddev *mddev, char *page)
4677 return sprintf(page, "%llu\n",
4678 (unsigned long long)mddev->dev_sectors / 2);
4681 static int update_size(struct mddev *mddev, sector_t num_sectors);
4684 size_store(struct mddev *mddev, const char *buf, size_t len)
4686 /* If array is inactive, we can reduce the component size, but
4687 * not increase it (except from 0).
4688 * If array is active, we can try an on-line resize
4691 int err = strict_blocks_to_sectors(buf, §ors);
4695 err = mddev_lock(mddev);
4699 err = update_size(mddev, sectors);
4701 md_update_sb(mddev, 1);
4703 if (mddev->dev_sectors == 0 ||
4704 mddev->dev_sectors > sectors)
4705 mddev->dev_sectors = sectors;
4709 mddev_unlock(mddev);
4710 return err ? err : len;
4713 static struct md_sysfs_entry md_size =
4714 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4716 /* Metadata version.
4718 * 'none' for arrays with no metadata (good luck...)
4719 * 'external' for arrays with externally managed metadata,
4720 * or N.M for internally known formats
4723 metadata_show(struct mddev *mddev, char *page)
4725 if (mddev->persistent)
4726 return sprintf(page, "%d.%d\n",
4727 mddev->major_version, mddev->minor_version);
4728 else if (mddev->external)
4729 return sprintf(page, "external:%s\n", mddev->metadata_type);
4731 return sprintf(page, "none\n");
4735 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4740 /* Changing the details of 'external' metadata is
4741 * always permitted. Otherwise there must be
4742 * no devices attached to the array.
4745 err = mddev_lock(mddev);
4749 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4751 else if (!list_empty(&mddev->disks))
4755 if (cmd_match(buf, "none")) {
4756 mddev->persistent = 0;
4757 mddev->external = 0;
4758 mddev->major_version = 0;
4759 mddev->minor_version = 90;
4762 if (strncmp(buf, "external:", 9) == 0) {
4763 size_t namelen = len-9;
4764 if (namelen >= sizeof(mddev->metadata_type))
4765 namelen = sizeof(mddev->metadata_type)-1;
4766 strncpy(mddev->metadata_type, buf+9, namelen);
4767 mddev->metadata_type[namelen] = 0;
4768 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4769 mddev->metadata_type[--namelen] = 0;
4770 mddev->persistent = 0;
4771 mddev->external = 1;
4772 mddev->major_version = 0;
4773 mddev->minor_version = 90;
4776 major = simple_strtoul(buf, &e, 10);
4778 if (e==buf || *e != '.')
4781 minor = simple_strtoul(buf, &e, 10);
4782 if (e==buf || (*e && *e != '\n') )
4785 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4787 mddev->major_version = major;
4788 mddev->minor_version = minor;
4789 mddev->persistent = 1;
4790 mddev->external = 0;
4793 mddev_unlock(mddev);
4797 static struct md_sysfs_entry md_metadata =
4798 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4801 action_show(struct mddev *mddev, char *page)
4803 char *type = "idle";
4804 unsigned long recovery = mddev->recovery;
4805 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4807 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4808 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4809 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4811 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4812 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4814 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4818 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4820 else if (mddev->reshape_position != MaxSector)
4823 return sprintf(page, "%s\n", type);
4827 action_store(struct mddev *mddev, const char *page, size_t len)
4829 if (!mddev->pers || !mddev->pers->sync_request)
4833 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4834 if (cmd_match(page, "frozen"))
4835 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4837 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4838 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4839 mddev_lock(mddev) == 0) {
4840 if (work_pending(&mddev->del_work))
4841 flush_workqueue(md_misc_wq);
4842 if (mddev->sync_thread) {
4843 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4844 md_reap_sync_thread(mddev);
4846 mddev_unlock(mddev);
4848 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4850 else if (cmd_match(page, "resync"))
4851 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4852 else if (cmd_match(page, "recover")) {
4853 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4854 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4855 } else if (cmd_match(page, "reshape")) {
4857 if (mddev->pers->start_reshape == NULL)
4859 err = mddev_lock(mddev);
4861 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4864 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4865 err = mddev->pers->start_reshape(mddev);
4867 mddev_unlock(mddev);
4871 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4873 if (cmd_match(page, "check"))
4874 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4875 else if (!cmd_match(page, "repair"))
4877 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4878 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4879 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4881 if (mddev->ro == 2) {
4882 /* A write to sync_action is enough to justify
4883 * canceling read-auto mode
4886 md_wakeup_thread(mddev->sync_thread);
4888 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4889 md_wakeup_thread(mddev->thread);
4890 sysfs_notify_dirent_safe(mddev->sysfs_action);
4894 static struct md_sysfs_entry md_scan_mode =
4895 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4898 last_sync_action_show(struct mddev *mddev, char *page)
4900 return sprintf(page, "%s\n", mddev->last_sync_action);
4903 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4906 mismatch_cnt_show(struct mddev *mddev, char *page)
4908 return sprintf(page, "%llu\n",
4909 (unsigned long long)
4910 atomic64_read(&mddev->resync_mismatches));
4913 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4916 sync_min_show(struct mddev *mddev, char *page)
4918 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4919 mddev->sync_speed_min ? "local": "system");
4923 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4928 if (strncmp(buf, "system", 6)==0) {
4931 rv = kstrtouint(buf, 10, &min);
4937 mddev->sync_speed_min = min;
4941 static struct md_sysfs_entry md_sync_min =
4942 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4945 sync_max_show(struct mddev *mddev, char *page)
4947 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4948 mddev->sync_speed_max ? "local": "system");
4952 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4957 if (strncmp(buf, "system", 6)==0) {
4960 rv = kstrtouint(buf, 10, &max);
4966 mddev->sync_speed_max = max;
4970 static struct md_sysfs_entry md_sync_max =
4971 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4974 degraded_show(struct mddev *mddev, char *page)
4976 return sprintf(page, "%d\n", mddev->degraded);
4978 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4981 sync_force_parallel_show(struct mddev *mddev, char *page)
4983 return sprintf(page, "%d\n", mddev->parallel_resync);
4987 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4991 if (kstrtol(buf, 10, &n))
4994 if (n != 0 && n != 1)
4997 mddev->parallel_resync = n;
4999 if (mddev->sync_thread)
5000 wake_up(&resync_wait);
5005 /* force parallel resync, even with shared block devices */
5006 static struct md_sysfs_entry md_sync_force_parallel =
5007 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5008 sync_force_parallel_show, sync_force_parallel_store);
5011 sync_speed_show(struct mddev *mddev, char *page)
5013 unsigned long resync, dt, db;
5014 if (mddev->curr_resync == 0)
5015 return sprintf(page, "none\n");
5016 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5017 dt = (jiffies - mddev->resync_mark) / HZ;
5019 db = resync - mddev->resync_mark_cnt;
5020 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5023 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5026 sync_completed_show(struct mddev *mddev, char *page)
5028 unsigned long long max_sectors, resync;
5030 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5031 return sprintf(page, "none\n");
5033 if (mddev->curr_resync == 1 ||
5034 mddev->curr_resync == 2)
5035 return sprintf(page, "delayed\n");
5037 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5038 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5039 max_sectors = mddev->resync_max_sectors;
5041 max_sectors = mddev->dev_sectors;
5043 resync = mddev->curr_resync_completed;
5044 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5047 static struct md_sysfs_entry md_sync_completed =
5048 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5051 min_sync_show(struct mddev *mddev, char *page)
5053 return sprintf(page, "%llu\n",
5054 (unsigned long long)mddev->resync_min);
5057 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5059 unsigned long long min;
5062 if (kstrtoull(buf, 10, &min))
5065 spin_lock(&mddev->lock);
5067 if (min > mddev->resync_max)
5071 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5074 /* Round down to multiple of 4K for safety */
5075 mddev->resync_min = round_down(min, 8);
5079 spin_unlock(&mddev->lock);
5083 static struct md_sysfs_entry md_min_sync =
5084 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5087 max_sync_show(struct mddev *mddev, char *page)
5089 if (mddev->resync_max == MaxSector)
5090 return sprintf(page, "max\n");
5092 return sprintf(page, "%llu\n",
5093 (unsigned long long)mddev->resync_max);
5096 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5099 spin_lock(&mddev->lock);
5100 if (strncmp(buf, "max", 3) == 0)
5101 mddev->resync_max = MaxSector;
5103 unsigned long long max;
5107 if (kstrtoull(buf, 10, &max))
5109 if (max < mddev->resync_min)
5113 if (max < mddev->resync_max &&
5115 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5118 /* Must be a multiple of chunk_size */
5119 chunk = mddev->chunk_sectors;
5121 sector_t temp = max;
5124 if (sector_div(temp, chunk))
5127 mddev->resync_max = max;
5129 wake_up(&mddev->recovery_wait);
5132 spin_unlock(&mddev->lock);
5136 static struct md_sysfs_entry md_max_sync =
5137 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5140 suspend_lo_show(struct mddev *mddev, char *page)
5142 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5146 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5148 unsigned long long new;
5151 err = kstrtoull(buf, 10, &new);
5154 if (new != (sector_t)new)
5157 err = mddev_lock(mddev);
5161 if (mddev->pers == NULL ||
5162 mddev->pers->quiesce == NULL)
5164 mddev_suspend(mddev);
5165 mddev->suspend_lo = new;
5166 mddev_resume(mddev);
5170 mddev_unlock(mddev);
5173 static struct md_sysfs_entry md_suspend_lo =
5174 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5177 suspend_hi_show(struct mddev *mddev, char *page)
5179 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5183 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5185 unsigned long long new;
5188 err = kstrtoull(buf, 10, &new);
5191 if (new != (sector_t)new)
5194 err = mddev_lock(mddev);
5198 if (mddev->pers == NULL)
5201 mddev_suspend(mddev);
5202 mddev->suspend_hi = new;
5203 mddev_resume(mddev);
5207 mddev_unlock(mddev);
5210 static struct md_sysfs_entry md_suspend_hi =
5211 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5214 reshape_position_show(struct mddev *mddev, char *page)
5216 if (mddev->reshape_position != MaxSector)
5217 return sprintf(page, "%llu\n",
5218 (unsigned long long)mddev->reshape_position);
5219 strcpy(page, "none\n");
5224 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5226 struct md_rdev *rdev;
5227 unsigned long long new;
5230 err = kstrtoull(buf, 10, &new);
5233 if (new != (sector_t)new)
5235 err = mddev_lock(mddev);
5241 mddev->reshape_position = new;
5242 mddev->delta_disks = 0;
5243 mddev->reshape_backwards = 0;
5244 mddev->new_level = mddev->level;
5245 mddev->new_layout = mddev->layout;
5246 mddev->new_chunk_sectors = mddev->chunk_sectors;
5247 rdev_for_each(rdev, mddev)
5248 rdev->new_data_offset = rdev->data_offset;
5251 mddev_unlock(mddev);
5255 static struct md_sysfs_entry md_reshape_position =
5256 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5257 reshape_position_store);
5260 reshape_direction_show(struct mddev *mddev, char *page)
5262 return sprintf(page, "%s\n",
5263 mddev->reshape_backwards ? "backwards" : "forwards");
5267 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5272 if (cmd_match(buf, "forwards"))
5274 else if (cmd_match(buf, "backwards"))
5278 if (mddev->reshape_backwards == backwards)
5281 err = mddev_lock(mddev);
5284 /* check if we are allowed to change */
5285 if (mddev->delta_disks)
5287 else if (mddev->persistent &&
5288 mddev->major_version == 0)
5291 mddev->reshape_backwards = backwards;
5292 mddev_unlock(mddev);
5296 static struct md_sysfs_entry md_reshape_direction =
5297 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5298 reshape_direction_store);
5301 array_size_show(struct mddev *mddev, char *page)
5303 if (mddev->external_size)
5304 return sprintf(page, "%llu\n",
5305 (unsigned long long)mddev->array_sectors/2);
5307 return sprintf(page, "default\n");
5311 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5316 err = mddev_lock(mddev);
5320 /* cluster raid doesn't support change array_sectors */
5321 if (mddev_is_clustered(mddev)) {
5322 mddev_unlock(mddev);
5326 if (strncmp(buf, "default", 7) == 0) {
5328 sectors = mddev->pers->size(mddev, 0, 0);
5330 sectors = mddev->array_sectors;
5332 mddev->external_size = 0;
5334 if (strict_blocks_to_sectors(buf, §ors) < 0)
5336 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5339 mddev->external_size = 1;
5343 mddev->array_sectors = sectors;
5345 set_capacity_and_notify(mddev->gendisk,
5346 mddev->array_sectors);
5348 mddev_unlock(mddev);
5352 static struct md_sysfs_entry md_array_size =
5353 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5357 consistency_policy_show(struct mddev *mddev, char *page)
5361 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5362 ret = sprintf(page, "journal\n");
5363 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5364 ret = sprintf(page, "ppl\n");
5365 } else if (mddev->bitmap) {
5366 ret = sprintf(page, "bitmap\n");
5367 } else if (mddev->pers) {
5368 if (mddev->pers->sync_request)
5369 ret = sprintf(page, "resync\n");
5371 ret = sprintf(page, "none\n");
5373 ret = sprintf(page, "unknown\n");
5380 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5385 if (mddev->pers->change_consistency_policy)
5386 err = mddev->pers->change_consistency_policy(mddev, buf);
5389 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5390 set_bit(MD_HAS_PPL, &mddev->flags);
5395 return err ? err : len;
5398 static struct md_sysfs_entry md_consistency_policy =
5399 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5400 consistency_policy_store);
5402 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5404 return sprintf(page, "%d\n", mddev->fail_last_dev);
5408 * Setting fail_last_dev to true to allow last device to be forcibly removed
5409 * from RAID1/RAID10.
5412 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5417 ret = kstrtobool(buf, &value);
5421 if (value != mddev->fail_last_dev)
5422 mddev->fail_last_dev = value;
5426 static struct md_sysfs_entry md_fail_last_dev =
5427 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5428 fail_last_dev_store);
5430 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5432 if (mddev->pers == NULL || (mddev->pers->level != 1))
5433 return sprintf(page, "n/a\n");
5435 return sprintf(page, "%d\n", mddev->serialize_policy);
5439 * Setting serialize_policy to true to enforce write IO is not reordered
5443 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5448 err = kstrtobool(buf, &value);
5452 if (value == mddev->serialize_policy)
5455 err = mddev_lock(mddev);
5458 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5459 pr_err("md: serialize_policy is only effective for raid1\n");
5464 mddev_suspend(mddev);
5466 mddev_create_serial_pool(mddev, NULL, true);
5468 mddev_destroy_serial_pool(mddev, NULL, true);
5469 mddev->serialize_policy = value;
5470 mddev_resume(mddev);
5472 mddev_unlock(mddev);
5476 static struct md_sysfs_entry md_serialize_policy =
5477 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5478 serialize_policy_store);
5481 static struct attribute *md_default_attrs[] = {
5484 &md_raid_disks.attr,
5486 &md_chunk_size.attr,
5488 &md_resync_start.attr,
5490 &md_new_device.attr,
5491 &md_safe_delay.attr,
5492 &md_array_state.attr,
5493 &md_reshape_position.attr,
5494 &md_reshape_direction.attr,
5495 &md_array_size.attr,
5496 &max_corr_read_errors.attr,
5497 &md_consistency_policy.attr,
5498 &md_fail_last_dev.attr,
5499 &md_serialize_policy.attr,
5503 static struct attribute *md_redundancy_attrs[] = {
5505 &md_last_scan_mode.attr,
5506 &md_mismatches.attr,
5509 &md_sync_speed.attr,
5510 &md_sync_force_parallel.attr,
5511 &md_sync_completed.attr,
5514 &md_suspend_lo.attr,
5515 &md_suspend_hi.attr,
5520 static const struct attribute_group md_redundancy_group = {
5522 .attrs = md_redundancy_attrs,
5526 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5528 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5529 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5534 spin_lock(&all_mddevs_lock);
5535 if (list_empty(&mddev->all_mddevs)) {
5536 spin_unlock(&all_mddevs_lock);
5540 spin_unlock(&all_mddevs_lock);
5542 rv = entry->show(mddev, page);
5548 md_attr_store(struct kobject *kobj, struct attribute *attr,
5549 const char *page, size_t length)
5551 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5552 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5557 if (!capable(CAP_SYS_ADMIN))
5559 spin_lock(&all_mddevs_lock);
5560 if (list_empty(&mddev->all_mddevs)) {
5561 spin_unlock(&all_mddevs_lock);
5565 spin_unlock(&all_mddevs_lock);
5566 rv = entry->store(mddev, page, length);
5571 static void md_free(struct kobject *ko)
5573 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5575 if (mddev->sysfs_state)
5576 sysfs_put(mddev->sysfs_state);
5577 if (mddev->sysfs_level)
5578 sysfs_put(mddev->sysfs_level);
5580 if (mddev->gendisk) {
5581 del_gendisk(mddev->gendisk);
5582 blk_cleanup_disk(mddev->gendisk);
5584 percpu_ref_exit(&mddev->writes_pending);
5586 bioset_exit(&mddev->bio_set);
5587 bioset_exit(&mddev->sync_set);
5588 if (mddev->level != 1 && mddev->level != 10)
5589 bioset_exit(&mddev->io_acct_set);
5593 static const struct sysfs_ops md_sysfs_ops = {
5594 .show = md_attr_show,
5595 .store = md_attr_store,
5597 static struct kobj_type md_ktype = {
5599 .sysfs_ops = &md_sysfs_ops,
5600 .default_attrs = md_default_attrs,
5605 static void mddev_delayed_delete(struct work_struct *ws)
5607 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5609 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5610 kobject_del(&mddev->kobj);
5611 kobject_put(&mddev->kobj);
5614 static void no_op(struct percpu_ref *r) {}
5616 int mddev_init_writes_pending(struct mddev *mddev)
5618 if (mddev->writes_pending.percpu_count_ptr)
5620 if (percpu_ref_init(&mddev->writes_pending, no_op,
5621 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5623 /* We want to start with the refcount at zero */
5624 percpu_ref_put(&mddev->writes_pending);
5627 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5629 static int md_alloc(dev_t dev, char *name)
5632 * If dev is zero, name is the name of a device to allocate with
5633 * an arbitrary minor number. It will be "md_???"
5634 * If dev is non-zero it must be a device number with a MAJOR of
5635 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5636 * the device is being created by opening a node in /dev.
5637 * If "name" is not NULL, the device is being created by
5638 * writing to /sys/module/md_mod/parameters/new_array.
5640 static DEFINE_MUTEX(disks_mutex);
5641 struct mddev *mddev;
5642 struct gendisk *disk;
5649 * Wait for any previous instance of this device to be completely
5650 * removed (mddev_delayed_delete).
5652 flush_workqueue(md_misc_wq);
5654 mutex_lock(&disks_mutex);
5655 mddev = mddev_alloc(dev);
5656 if (IS_ERR(mddev)) {
5657 mutex_unlock(&disks_mutex);
5658 return PTR_ERR(mddev);
5661 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5662 shift = partitioned ? MdpMinorShift : 0;
5663 unit = MINOR(mddev->unit) >> shift;
5666 /* Need to ensure that 'name' is not a duplicate.
5668 struct mddev *mddev2;
5669 spin_lock(&all_mddevs_lock);
5671 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5672 if (mddev2->gendisk &&
5673 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5674 spin_unlock(&all_mddevs_lock);
5678 spin_unlock(&all_mddevs_lock);
5682 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5684 mddev->hold_active = UNTIL_STOP;
5687 disk = blk_alloc_disk(NUMA_NO_NODE);
5691 disk->major = MAJOR(mddev->unit);
5692 disk->first_minor = unit << shift;
5693 disk->minors = 1 << shift;
5695 strcpy(disk->disk_name, name);
5696 else if (partitioned)
5697 sprintf(disk->disk_name, "md_d%d", unit);
5699 sprintf(disk->disk_name, "md%d", unit);
5700 disk->fops = &md_fops;
5701 disk->private_data = mddev;
5703 mddev->queue = disk->queue;
5704 blk_set_stacking_limits(&mddev->queue->limits);
5705 blk_queue_write_cache(mddev->queue, true, true);
5706 /* Allow extended partitions. This makes the
5707 * 'mdp' device redundant, but we can't really
5710 disk->flags |= GENHD_FL_EXT_DEVT;
5711 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5712 mddev->gendisk = disk;
5715 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5717 /* This isn't possible, but as kobject_init_and_add is marked
5718 * __must_check, we must do something with the result
5720 pr_debug("md: cannot register %s/md - name in use\n",
5724 if (mddev->kobj.sd &&
5725 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5726 pr_debug("pointless warning\n");
5728 mutex_unlock(&disks_mutex);
5729 if (!error && mddev->kobj.sd) {
5730 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5731 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5732 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5738 static void md_probe(dev_t dev)
5740 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5743 md_alloc(dev, NULL);
5746 static int add_named_array(const char *val, const struct kernel_param *kp)
5749 * val must be "md_*" or "mdNNN".
5750 * For "md_*" we allocate an array with a large free minor number, and
5751 * set the name to val. val must not already be an active name.
5752 * For "mdNNN" we allocate an array with the minor number NNN
5753 * which must not already be in use.
5755 int len = strlen(val);
5756 char buf[DISK_NAME_LEN];
5757 unsigned long devnum;
5759 while (len && val[len-1] == '\n')
5761 if (len >= DISK_NAME_LEN)
5763 strlcpy(buf, val, len+1);
5764 if (strncmp(buf, "md_", 3) == 0)
5765 return md_alloc(0, buf);
5766 if (strncmp(buf, "md", 2) == 0 &&
5768 kstrtoul(buf+2, 10, &devnum) == 0 &&
5769 devnum <= MINORMASK)
5770 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5775 static void md_safemode_timeout(struct timer_list *t)
5777 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5779 mddev->safemode = 1;
5780 if (mddev->external)
5781 sysfs_notify_dirent_safe(mddev->sysfs_state);
5783 md_wakeup_thread(mddev->thread);
5786 static int start_dirty_degraded;
5788 int md_run(struct mddev *mddev)
5791 struct md_rdev *rdev;
5792 struct md_personality *pers;
5794 if (list_empty(&mddev->disks))
5795 /* cannot run an array with no devices.. */
5800 /* Cannot run until previous stop completes properly */
5801 if (mddev->sysfs_active)
5805 * Analyze all RAID superblock(s)
5807 if (!mddev->raid_disks) {
5808 if (!mddev->persistent)
5810 err = analyze_sbs(mddev);
5815 if (mddev->level != LEVEL_NONE)
5816 request_module("md-level-%d", mddev->level);
5817 else if (mddev->clevel[0])
5818 request_module("md-%s", mddev->clevel);
5821 * Drop all container device buffers, from now on
5822 * the only valid external interface is through the md
5825 mddev->has_superblocks = false;
5826 rdev_for_each(rdev, mddev) {
5827 if (test_bit(Faulty, &rdev->flags))
5829 sync_blockdev(rdev->bdev);
5830 invalidate_bdev(rdev->bdev);
5831 if (mddev->ro != 1 && rdev_read_only(rdev)) {
5834 set_disk_ro(mddev->gendisk, 1);
5838 mddev->has_superblocks = true;
5840 /* perform some consistency tests on the device.
5841 * We don't want the data to overlap the metadata,
5842 * Internal Bitmap issues have been handled elsewhere.
5844 if (rdev->meta_bdev) {
5845 /* Nothing to check */;
5846 } else if (rdev->data_offset < rdev->sb_start) {
5847 if (mddev->dev_sectors &&
5848 rdev->data_offset + mddev->dev_sectors
5850 pr_warn("md: %s: data overlaps metadata\n",
5855 if (rdev->sb_start + rdev->sb_size/512
5856 > rdev->data_offset) {
5857 pr_warn("md: %s: metadata overlaps data\n",
5862 sysfs_notify_dirent_safe(rdev->sysfs_state);
5865 if (!bioset_initialized(&mddev->bio_set)) {
5866 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5870 if (!bioset_initialized(&mddev->sync_set)) {
5871 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5876 spin_lock(&pers_lock);
5877 pers = find_pers(mddev->level, mddev->clevel);
5878 if (!pers || !try_module_get(pers->owner)) {
5879 spin_unlock(&pers_lock);
5880 if (mddev->level != LEVEL_NONE)
5881 pr_warn("md: personality for level %d is not loaded!\n",
5884 pr_warn("md: personality for level %s is not loaded!\n",
5889 spin_unlock(&pers_lock);
5890 if (mddev->level != pers->level) {
5891 mddev->level = pers->level;
5892 mddev->new_level = pers->level;
5894 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5896 if (mddev->reshape_position != MaxSector &&
5897 pers->start_reshape == NULL) {
5898 /* This personality cannot handle reshaping... */
5899 module_put(pers->owner);
5904 if (pers->sync_request) {
5905 /* Warn if this is a potentially silly
5908 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5909 struct md_rdev *rdev2;
5912 rdev_for_each(rdev, mddev)
5913 rdev_for_each(rdev2, mddev) {
5915 rdev->bdev->bd_disk ==
5916 rdev2->bdev->bd_disk) {
5917 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5919 bdevname(rdev->bdev,b),
5920 bdevname(rdev2->bdev,b2));
5926 pr_warn("True protection against single-disk failure might be compromised.\n");
5929 mddev->recovery = 0;
5930 /* may be over-ridden by personality */
5931 mddev->resync_max_sectors = mddev->dev_sectors;
5933 mddev->ok_start_degraded = start_dirty_degraded;
5935 if (start_readonly && mddev->ro == 0)
5936 mddev->ro = 2; /* read-only, but switch on first write */
5938 err = pers->run(mddev);
5940 pr_warn("md: pers->run() failed ...\n");
5941 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5942 WARN_ONCE(!mddev->external_size,
5943 "%s: default size too small, but 'external_size' not in effect?\n",
5945 pr_warn("md: invalid array_size %llu > default size %llu\n",
5946 (unsigned long long)mddev->array_sectors / 2,
5947 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5950 if (err == 0 && pers->sync_request &&
5951 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5952 struct bitmap *bitmap;
5954 bitmap = md_bitmap_create(mddev, -1);
5955 if (IS_ERR(bitmap)) {
5956 err = PTR_ERR(bitmap);
5957 pr_warn("%s: failed to create bitmap (%d)\n",
5958 mdname(mddev), err);
5960 mddev->bitmap = bitmap;
5966 if (mddev->bitmap_info.max_write_behind > 0) {
5967 bool create_pool = false;
5969 rdev_for_each(rdev, mddev) {
5970 if (test_bit(WriteMostly, &rdev->flags) &&
5971 rdev_init_serial(rdev))
5974 if (create_pool && mddev->serial_info_pool == NULL) {
5975 mddev->serial_info_pool =
5976 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
5977 sizeof(struct serial_info));
5978 if (!mddev->serial_info_pool) {
5988 rdev_for_each(rdev, mddev) {
5989 if (rdev->raid_disk >= 0 &&
5990 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5995 if (mddev->degraded)
5998 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6000 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6001 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6003 if (pers->sync_request) {
6004 if (mddev->kobj.sd &&
6005 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6006 pr_warn("md: cannot register extra attributes for %s\n",
6008 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6009 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6010 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6011 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
6014 atomic_set(&mddev->max_corr_read_errors,
6015 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6016 mddev->safemode = 0;
6017 if (mddev_is_clustered(mddev))
6018 mddev->safemode_delay = 0;
6020 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6023 spin_lock(&mddev->lock);
6025 spin_unlock(&mddev->lock);
6026 rdev_for_each(rdev, mddev)
6027 if (rdev->raid_disk >= 0)
6028 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6030 if (mddev->degraded && !mddev->ro)
6031 /* This ensures that recovering status is reported immediately
6032 * via sysfs - until a lack of spares is confirmed.
6034 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6035 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6037 if (mddev->sb_flags)
6038 md_update_sb(mddev, 0);
6040 md_new_event(mddev);
6044 mddev_detach(mddev);
6046 pers->free(mddev, mddev->private);
6047 mddev->private = NULL;
6048 module_put(pers->owner);
6049 md_bitmap_destroy(mddev);
6051 bioset_exit(&mddev->sync_set);
6053 bioset_exit(&mddev->bio_set);
6056 EXPORT_SYMBOL_GPL(md_run);
6058 int do_md_run(struct mddev *mddev)
6062 set_bit(MD_NOT_READY, &mddev->flags);
6063 err = md_run(mddev);
6066 err = md_bitmap_load(mddev);
6068 md_bitmap_destroy(mddev);
6072 if (mddev_is_clustered(mddev))
6073 md_allow_write(mddev);
6075 /* run start up tasks that require md_thread */
6078 md_wakeup_thread(mddev->thread);
6079 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6081 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6082 clear_bit(MD_NOT_READY, &mddev->flags);
6084 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6085 sysfs_notify_dirent_safe(mddev->sysfs_state);
6086 sysfs_notify_dirent_safe(mddev->sysfs_action);
6087 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6089 clear_bit(MD_NOT_READY, &mddev->flags);
6093 int md_start(struct mddev *mddev)
6097 if (mddev->pers->start) {
6098 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6099 md_wakeup_thread(mddev->thread);
6100 ret = mddev->pers->start(mddev);
6101 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6102 md_wakeup_thread(mddev->sync_thread);
6106 EXPORT_SYMBOL_GPL(md_start);
6108 static int restart_array(struct mddev *mddev)
6110 struct gendisk *disk = mddev->gendisk;
6111 struct md_rdev *rdev;
6112 bool has_journal = false;
6113 bool has_readonly = false;
6115 /* Complain if it has no devices */
6116 if (list_empty(&mddev->disks))
6124 rdev_for_each_rcu(rdev, mddev) {
6125 if (test_bit(Journal, &rdev->flags) &&
6126 !test_bit(Faulty, &rdev->flags))
6128 if (rdev_read_only(rdev))
6129 has_readonly = true;
6132 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6133 /* Don't restart rw with journal missing/faulty */
6138 mddev->safemode = 0;
6140 set_disk_ro(disk, 0);
6141 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6142 /* Kick recovery or resync if necessary */
6143 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6144 md_wakeup_thread(mddev->thread);
6145 md_wakeup_thread(mddev->sync_thread);
6146 sysfs_notify_dirent_safe(mddev->sysfs_state);
6150 static void md_clean(struct mddev *mddev)
6152 mddev->array_sectors = 0;
6153 mddev->external_size = 0;
6154 mddev->dev_sectors = 0;
6155 mddev->raid_disks = 0;
6156 mddev->recovery_cp = 0;
6157 mddev->resync_min = 0;
6158 mddev->resync_max = MaxSector;
6159 mddev->reshape_position = MaxSector;
6160 mddev->external = 0;
6161 mddev->persistent = 0;
6162 mddev->level = LEVEL_NONE;
6163 mddev->clevel[0] = 0;
6165 mddev->sb_flags = 0;
6167 mddev->metadata_type[0] = 0;
6168 mddev->chunk_sectors = 0;
6169 mddev->ctime = mddev->utime = 0;
6171 mddev->max_disks = 0;
6173 mddev->can_decrease_events = 0;
6174 mddev->delta_disks = 0;
6175 mddev->reshape_backwards = 0;
6176 mddev->new_level = LEVEL_NONE;
6177 mddev->new_layout = 0;
6178 mddev->new_chunk_sectors = 0;
6179 mddev->curr_resync = 0;
6180 atomic64_set(&mddev->resync_mismatches, 0);
6181 mddev->suspend_lo = mddev->suspend_hi = 0;
6182 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6183 mddev->recovery = 0;
6186 mddev->degraded = 0;
6187 mddev->safemode = 0;
6188 mddev->private = NULL;
6189 mddev->cluster_info = NULL;
6190 mddev->bitmap_info.offset = 0;
6191 mddev->bitmap_info.default_offset = 0;
6192 mddev->bitmap_info.default_space = 0;
6193 mddev->bitmap_info.chunksize = 0;
6194 mddev->bitmap_info.daemon_sleep = 0;
6195 mddev->bitmap_info.max_write_behind = 0;
6196 mddev->bitmap_info.nodes = 0;
6199 static void __md_stop_writes(struct mddev *mddev)
6201 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6202 if (work_pending(&mddev->del_work))
6203 flush_workqueue(md_misc_wq);
6204 if (mddev->sync_thread) {
6205 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6206 md_reap_sync_thread(mddev);
6209 del_timer_sync(&mddev->safemode_timer);
6211 if (mddev->pers && mddev->pers->quiesce) {
6212 mddev->pers->quiesce(mddev, 1);
6213 mddev->pers->quiesce(mddev, 0);
6215 md_bitmap_flush(mddev);
6217 if (mddev->ro == 0 &&
6218 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6220 /* mark array as shutdown cleanly */
6221 if (!mddev_is_clustered(mddev))
6223 md_update_sb(mddev, 1);
6225 /* disable policy to guarantee rdevs free resources for serialization */
6226 mddev->serialize_policy = 0;
6227 mddev_destroy_serial_pool(mddev, NULL, true);
6230 void md_stop_writes(struct mddev *mddev)
6232 mddev_lock_nointr(mddev);
6233 __md_stop_writes(mddev);
6234 mddev_unlock(mddev);
6236 EXPORT_SYMBOL_GPL(md_stop_writes);
6238 static void mddev_detach(struct mddev *mddev)
6240 md_bitmap_wait_behind_writes(mddev);
6241 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6242 mddev->pers->quiesce(mddev, 1);
6243 mddev->pers->quiesce(mddev, 0);
6245 md_unregister_thread(&mddev->thread);
6247 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6250 static void __md_stop(struct mddev *mddev)
6252 struct md_personality *pers = mddev->pers;
6253 md_bitmap_destroy(mddev);
6254 mddev_detach(mddev);
6255 /* Ensure ->event_work is done */
6256 if (mddev->event_work.func)
6257 flush_workqueue(md_misc_wq);
6258 spin_lock(&mddev->lock);
6260 spin_unlock(&mddev->lock);
6261 pers->free(mddev, mddev->private);
6262 mddev->private = NULL;
6263 if (pers->sync_request && mddev->to_remove == NULL)
6264 mddev->to_remove = &md_redundancy_group;
6265 module_put(pers->owner);
6266 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6269 void md_stop(struct mddev *mddev)
6271 /* stop the array and free an attached data structures.
6272 * This is called from dm-raid
6275 bioset_exit(&mddev->bio_set);
6276 bioset_exit(&mddev->sync_set);
6277 if (mddev->level != 1 && mddev->level != 10)
6278 bioset_exit(&mddev->io_acct_set);
6281 EXPORT_SYMBOL_GPL(md_stop);
6283 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6288 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6290 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6291 md_wakeup_thread(mddev->thread);
6293 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6294 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6295 if (mddev->sync_thread)
6296 /* Thread might be blocked waiting for metadata update
6297 * which will now never happen */
6298 wake_up_process(mddev->sync_thread->tsk);
6300 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6302 mddev_unlock(mddev);
6303 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6305 wait_event(mddev->sb_wait,
6306 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6307 mddev_lock_nointr(mddev);
6309 mutex_lock(&mddev->open_mutex);
6310 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6311 mddev->sync_thread ||
6312 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6313 pr_warn("md: %s still in use.\n",mdname(mddev));
6315 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6316 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6317 md_wakeup_thread(mddev->thread);
6323 __md_stop_writes(mddev);
6329 set_disk_ro(mddev->gendisk, 1);
6330 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6331 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6332 md_wakeup_thread(mddev->thread);
6333 sysfs_notify_dirent_safe(mddev->sysfs_state);
6337 mutex_unlock(&mddev->open_mutex);
6342 * 0 - completely stop and dis-assemble array
6343 * 2 - stop but do not disassemble array
6345 static int do_md_stop(struct mddev *mddev, int mode,
6346 struct block_device *bdev)
6348 struct gendisk *disk = mddev->gendisk;
6349 struct md_rdev *rdev;
6352 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6354 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6355 md_wakeup_thread(mddev->thread);
6357 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6358 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6359 if (mddev->sync_thread)
6360 /* Thread might be blocked waiting for metadata update
6361 * which will now never happen */
6362 wake_up_process(mddev->sync_thread->tsk);
6364 mddev_unlock(mddev);
6365 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6366 !test_bit(MD_RECOVERY_RUNNING,
6367 &mddev->recovery)));
6368 mddev_lock_nointr(mddev);
6370 mutex_lock(&mddev->open_mutex);
6371 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6372 mddev->sysfs_active ||
6373 mddev->sync_thread ||
6374 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6375 pr_warn("md: %s still in use.\n",mdname(mddev));
6376 mutex_unlock(&mddev->open_mutex);
6378 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6379 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6380 md_wakeup_thread(mddev->thread);
6386 set_disk_ro(disk, 0);
6388 __md_stop_writes(mddev);
6391 /* tell userspace to handle 'inactive' */
6392 sysfs_notify_dirent_safe(mddev->sysfs_state);
6394 rdev_for_each(rdev, mddev)
6395 if (rdev->raid_disk >= 0)
6396 sysfs_unlink_rdev(mddev, rdev);
6398 set_capacity_and_notify(disk, 0);
6399 mutex_unlock(&mddev->open_mutex);
6405 mutex_unlock(&mddev->open_mutex);
6407 * Free resources if final stop
6410 pr_info("md: %s stopped.\n", mdname(mddev));
6412 if (mddev->bitmap_info.file) {
6413 struct file *f = mddev->bitmap_info.file;
6414 spin_lock(&mddev->lock);
6415 mddev->bitmap_info.file = NULL;
6416 spin_unlock(&mddev->lock);
6419 mddev->bitmap_info.offset = 0;
6421 export_array(mddev);
6424 if (mddev->hold_active == UNTIL_STOP)
6425 mddev->hold_active = 0;
6427 md_new_event(mddev);
6428 sysfs_notify_dirent_safe(mddev->sysfs_state);
6433 static void autorun_array(struct mddev *mddev)
6435 struct md_rdev *rdev;
6438 if (list_empty(&mddev->disks))
6441 pr_info("md: running: ");
6443 rdev_for_each(rdev, mddev) {
6444 char b[BDEVNAME_SIZE];
6445 pr_cont("<%s>", bdevname(rdev->bdev,b));
6449 err = do_md_run(mddev);
6451 pr_warn("md: do_md_run() returned %d\n", err);
6452 do_md_stop(mddev, 0, NULL);
6457 * lets try to run arrays based on all disks that have arrived
6458 * until now. (those are in pending_raid_disks)
6460 * the method: pick the first pending disk, collect all disks with
6461 * the same UUID, remove all from the pending list and put them into
6462 * the 'same_array' list. Then order this list based on superblock
6463 * update time (freshest comes first), kick out 'old' disks and
6464 * compare superblocks. If everything's fine then run it.
6466 * If "unit" is allocated, then bump its reference count
6468 static void autorun_devices(int part)
6470 struct md_rdev *rdev0, *rdev, *tmp;
6471 struct mddev *mddev;
6472 char b[BDEVNAME_SIZE];
6474 pr_info("md: autorun ...\n");
6475 while (!list_empty(&pending_raid_disks)) {
6478 LIST_HEAD(candidates);
6479 rdev0 = list_entry(pending_raid_disks.next,
6480 struct md_rdev, same_set);
6482 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6483 INIT_LIST_HEAD(&candidates);
6484 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6485 if (super_90_load(rdev, rdev0, 0) >= 0) {
6486 pr_debug("md: adding %s ...\n",
6487 bdevname(rdev->bdev,b));
6488 list_move(&rdev->same_set, &candidates);
6491 * now we have a set of devices, with all of them having
6492 * mostly sane superblocks. It's time to allocate the
6496 dev = MKDEV(mdp_major,
6497 rdev0->preferred_minor << MdpMinorShift);
6498 unit = MINOR(dev) >> MdpMinorShift;
6500 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6503 if (rdev0->preferred_minor != unit) {
6504 pr_warn("md: unit number in %s is bad: %d\n",
6505 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6510 mddev = mddev_find(dev);
6514 if (mddev_lock(mddev))
6515 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6516 else if (mddev->raid_disks || mddev->major_version
6517 || !list_empty(&mddev->disks)) {
6518 pr_warn("md: %s already running, cannot run %s\n",
6519 mdname(mddev), bdevname(rdev0->bdev,b));
6520 mddev_unlock(mddev);
6522 pr_debug("md: created %s\n", mdname(mddev));
6523 mddev->persistent = 1;
6524 rdev_for_each_list(rdev, tmp, &candidates) {
6525 list_del_init(&rdev->same_set);
6526 if (bind_rdev_to_array(rdev, mddev))
6529 autorun_array(mddev);
6530 mddev_unlock(mddev);
6532 /* on success, candidates will be empty, on error
6535 rdev_for_each_list(rdev, tmp, &candidates) {
6536 list_del_init(&rdev->same_set);
6541 pr_info("md: ... autorun DONE.\n");
6543 #endif /* !MODULE */
6545 static int get_version(void __user *arg)
6549 ver.major = MD_MAJOR_VERSION;
6550 ver.minor = MD_MINOR_VERSION;
6551 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6553 if (copy_to_user(arg, &ver, sizeof(ver)))
6559 static int get_array_info(struct mddev *mddev, void __user *arg)
6561 mdu_array_info_t info;
6562 int nr,working,insync,failed,spare;
6563 struct md_rdev *rdev;
6565 nr = working = insync = failed = spare = 0;
6567 rdev_for_each_rcu(rdev, mddev) {
6569 if (test_bit(Faulty, &rdev->flags))
6573 if (test_bit(In_sync, &rdev->flags))
6575 else if (test_bit(Journal, &rdev->flags))
6576 /* TODO: add journal count to md_u.h */
6584 info.major_version = mddev->major_version;
6585 info.minor_version = mddev->minor_version;
6586 info.patch_version = MD_PATCHLEVEL_VERSION;
6587 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6588 info.level = mddev->level;
6589 info.size = mddev->dev_sectors / 2;
6590 if (info.size != mddev->dev_sectors / 2) /* overflow */
6593 info.raid_disks = mddev->raid_disks;
6594 info.md_minor = mddev->md_minor;
6595 info.not_persistent= !mddev->persistent;
6597 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6600 info.state = (1<<MD_SB_CLEAN);
6601 if (mddev->bitmap && mddev->bitmap_info.offset)
6602 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6603 if (mddev_is_clustered(mddev))
6604 info.state |= (1<<MD_SB_CLUSTERED);
6605 info.active_disks = insync;
6606 info.working_disks = working;
6607 info.failed_disks = failed;
6608 info.spare_disks = spare;
6610 info.layout = mddev->layout;
6611 info.chunk_size = mddev->chunk_sectors << 9;
6613 if (copy_to_user(arg, &info, sizeof(info)))
6619 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6621 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6625 file = kzalloc(sizeof(*file), GFP_NOIO);
6630 spin_lock(&mddev->lock);
6631 /* bitmap enabled */
6632 if (mddev->bitmap_info.file) {
6633 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6634 sizeof(file->pathname));
6638 memmove(file->pathname, ptr,
6639 sizeof(file->pathname)-(ptr-file->pathname));
6641 spin_unlock(&mddev->lock);
6644 copy_to_user(arg, file, sizeof(*file)))
6651 static int get_disk_info(struct mddev *mddev, void __user * arg)
6653 mdu_disk_info_t info;
6654 struct md_rdev *rdev;
6656 if (copy_from_user(&info, arg, sizeof(info)))
6660 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6662 info.major = MAJOR(rdev->bdev->bd_dev);
6663 info.minor = MINOR(rdev->bdev->bd_dev);
6664 info.raid_disk = rdev->raid_disk;
6666 if (test_bit(Faulty, &rdev->flags))
6667 info.state |= (1<<MD_DISK_FAULTY);
6668 else if (test_bit(In_sync, &rdev->flags)) {
6669 info.state |= (1<<MD_DISK_ACTIVE);
6670 info.state |= (1<<MD_DISK_SYNC);
6672 if (test_bit(Journal, &rdev->flags))
6673 info.state |= (1<<MD_DISK_JOURNAL);
6674 if (test_bit(WriteMostly, &rdev->flags))
6675 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6676 if (test_bit(FailFast, &rdev->flags))
6677 info.state |= (1<<MD_DISK_FAILFAST);
6679 info.major = info.minor = 0;
6680 info.raid_disk = -1;
6681 info.state = (1<<MD_DISK_REMOVED);
6685 if (copy_to_user(arg, &info, sizeof(info)))
6691 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6693 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6694 struct md_rdev *rdev;
6695 dev_t dev = MKDEV(info->major,info->minor);
6697 if (mddev_is_clustered(mddev) &&
6698 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6699 pr_warn("%s: Cannot add to clustered mddev.\n",
6704 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6707 if (!mddev->raid_disks) {
6709 /* expecting a device which has a superblock */
6710 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6712 pr_warn("md: md_import_device returned %ld\n",
6714 return PTR_ERR(rdev);
6716 if (!list_empty(&mddev->disks)) {
6717 struct md_rdev *rdev0
6718 = list_entry(mddev->disks.next,
6719 struct md_rdev, same_set);
6720 err = super_types[mddev->major_version]
6721 .load_super(rdev, rdev0, mddev->minor_version);
6723 pr_warn("md: %s has different UUID to %s\n",
6724 bdevname(rdev->bdev,b),
6725 bdevname(rdev0->bdev,b2));
6730 err = bind_rdev_to_array(rdev, mddev);
6737 * md_add_new_disk can be used once the array is assembled
6738 * to add "hot spares". They must already have a superblock
6743 if (!mddev->pers->hot_add_disk) {
6744 pr_warn("%s: personality does not support diskops!\n",
6748 if (mddev->persistent)
6749 rdev = md_import_device(dev, mddev->major_version,
6750 mddev->minor_version);
6752 rdev = md_import_device(dev, -1, -1);
6754 pr_warn("md: md_import_device returned %ld\n",
6756 return PTR_ERR(rdev);
6758 /* set saved_raid_disk if appropriate */
6759 if (!mddev->persistent) {
6760 if (info->state & (1<<MD_DISK_SYNC) &&
6761 info->raid_disk < mddev->raid_disks) {
6762 rdev->raid_disk = info->raid_disk;
6763 set_bit(In_sync, &rdev->flags);
6764 clear_bit(Bitmap_sync, &rdev->flags);
6766 rdev->raid_disk = -1;
6767 rdev->saved_raid_disk = rdev->raid_disk;
6769 super_types[mddev->major_version].
6770 validate_super(mddev, rdev);
6771 if ((info->state & (1<<MD_DISK_SYNC)) &&
6772 rdev->raid_disk != info->raid_disk) {
6773 /* This was a hot-add request, but events doesn't
6774 * match, so reject it.
6780 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6781 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6782 set_bit(WriteMostly, &rdev->flags);
6784 clear_bit(WriteMostly, &rdev->flags);
6785 if (info->state & (1<<MD_DISK_FAILFAST))
6786 set_bit(FailFast, &rdev->flags);
6788 clear_bit(FailFast, &rdev->flags);
6790 if (info->state & (1<<MD_DISK_JOURNAL)) {
6791 struct md_rdev *rdev2;
6792 bool has_journal = false;
6794 /* make sure no existing journal disk */
6795 rdev_for_each(rdev2, mddev) {
6796 if (test_bit(Journal, &rdev2->flags)) {
6801 if (has_journal || mddev->bitmap) {
6805 set_bit(Journal, &rdev->flags);
6808 * check whether the device shows up in other nodes
6810 if (mddev_is_clustered(mddev)) {
6811 if (info->state & (1 << MD_DISK_CANDIDATE))
6812 set_bit(Candidate, &rdev->flags);
6813 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6814 /* --add initiated by this node */
6815 err = md_cluster_ops->add_new_disk(mddev, rdev);
6823 rdev->raid_disk = -1;
6824 err = bind_rdev_to_array(rdev, mddev);
6829 if (mddev_is_clustered(mddev)) {
6830 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6832 err = md_cluster_ops->new_disk_ack(mddev,
6835 md_kick_rdev_from_array(rdev);
6839 md_cluster_ops->add_new_disk_cancel(mddev);
6841 err = add_bound_rdev(rdev);
6845 err = add_bound_rdev(rdev);
6850 /* otherwise, md_add_new_disk is only allowed
6851 * for major_version==0 superblocks
6853 if (mddev->major_version != 0) {
6854 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6858 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6860 rdev = md_import_device(dev, -1, 0);
6862 pr_warn("md: error, md_import_device() returned %ld\n",
6864 return PTR_ERR(rdev);
6866 rdev->desc_nr = info->number;
6867 if (info->raid_disk < mddev->raid_disks)
6868 rdev->raid_disk = info->raid_disk;
6870 rdev->raid_disk = -1;
6872 if (rdev->raid_disk < mddev->raid_disks)
6873 if (info->state & (1<<MD_DISK_SYNC))
6874 set_bit(In_sync, &rdev->flags);
6876 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6877 set_bit(WriteMostly, &rdev->flags);
6878 if (info->state & (1<<MD_DISK_FAILFAST))
6879 set_bit(FailFast, &rdev->flags);
6881 if (!mddev->persistent) {
6882 pr_debug("md: nonpersistent superblock ...\n");
6883 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6885 rdev->sb_start = calc_dev_sboffset(rdev);
6886 rdev->sectors = rdev->sb_start;
6888 err = bind_rdev_to_array(rdev, mddev);
6898 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6900 char b[BDEVNAME_SIZE];
6901 struct md_rdev *rdev;
6906 rdev = find_rdev(mddev, dev);
6910 if (rdev->raid_disk < 0)
6913 clear_bit(Blocked, &rdev->flags);
6914 remove_and_add_spares(mddev, rdev);
6916 if (rdev->raid_disk >= 0)
6920 if (mddev_is_clustered(mddev)) {
6921 if (md_cluster_ops->remove_disk(mddev, rdev))
6925 md_kick_rdev_from_array(rdev);
6926 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6928 md_wakeup_thread(mddev->thread);
6930 md_update_sb(mddev, 1);
6931 md_new_event(mddev);
6935 pr_debug("md: cannot remove active disk %s from %s ...\n",
6936 bdevname(rdev->bdev,b), mdname(mddev));
6940 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6942 char b[BDEVNAME_SIZE];
6944 struct md_rdev *rdev;
6949 if (mddev->major_version != 0) {
6950 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6954 if (!mddev->pers->hot_add_disk) {
6955 pr_warn("%s: personality does not support diskops!\n",
6960 rdev = md_import_device(dev, -1, 0);
6962 pr_warn("md: error, md_import_device() returned %ld\n",
6967 if (mddev->persistent)
6968 rdev->sb_start = calc_dev_sboffset(rdev);
6970 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6972 rdev->sectors = rdev->sb_start;
6974 if (test_bit(Faulty, &rdev->flags)) {
6975 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6976 bdevname(rdev->bdev,b), mdname(mddev));
6981 clear_bit(In_sync, &rdev->flags);
6983 rdev->saved_raid_disk = -1;
6984 err = bind_rdev_to_array(rdev, mddev);
6989 * The rest should better be atomic, we can have disk failures
6990 * noticed in interrupt contexts ...
6993 rdev->raid_disk = -1;
6995 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6997 md_update_sb(mddev, 1);
6999 * Kick recovery, maybe this spare has to be added to the
7000 * array immediately.
7002 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7003 md_wakeup_thread(mddev->thread);
7004 md_new_event(mddev);
7012 static int set_bitmap_file(struct mddev *mddev, int fd)
7017 if (!mddev->pers->quiesce || !mddev->thread)
7019 if (mddev->recovery || mddev->sync_thread)
7021 /* we should be able to change the bitmap.. */
7025 struct inode *inode;
7028 if (mddev->bitmap || mddev->bitmap_info.file)
7029 return -EEXIST; /* cannot add when bitmap is present */
7033 pr_warn("%s: error: failed to get bitmap file\n",
7038 inode = f->f_mapping->host;
7039 if (!S_ISREG(inode->i_mode)) {
7040 pr_warn("%s: error: bitmap file must be a regular file\n",
7043 } else if (!(f->f_mode & FMODE_WRITE)) {
7044 pr_warn("%s: error: bitmap file must open for write\n",
7047 } else if (atomic_read(&inode->i_writecount) != 1) {
7048 pr_warn("%s: error: bitmap file is already in use\n",
7056 mddev->bitmap_info.file = f;
7057 mddev->bitmap_info.offset = 0; /* file overrides offset */
7058 } else if (mddev->bitmap == NULL)
7059 return -ENOENT; /* cannot remove what isn't there */
7063 struct bitmap *bitmap;
7065 bitmap = md_bitmap_create(mddev, -1);
7066 mddev_suspend(mddev);
7067 if (!IS_ERR(bitmap)) {
7068 mddev->bitmap = bitmap;
7069 err = md_bitmap_load(mddev);
7071 err = PTR_ERR(bitmap);
7073 md_bitmap_destroy(mddev);
7076 mddev_resume(mddev);
7077 } else if (fd < 0) {
7078 mddev_suspend(mddev);
7079 md_bitmap_destroy(mddev);
7080 mddev_resume(mddev);
7084 struct file *f = mddev->bitmap_info.file;
7086 spin_lock(&mddev->lock);
7087 mddev->bitmap_info.file = NULL;
7088 spin_unlock(&mddev->lock);
7097 * md_set_array_info is used two different ways
7098 * The original usage is when creating a new array.
7099 * In this usage, raid_disks is > 0 and it together with
7100 * level, size, not_persistent,layout,chunksize determine the
7101 * shape of the array.
7102 * This will always create an array with a type-0.90.0 superblock.
7103 * The newer usage is when assembling an array.
7104 * In this case raid_disks will be 0, and the major_version field is
7105 * use to determine which style super-blocks are to be found on the devices.
7106 * The minor and patch _version numbers are also kept incase the
7107 * super_block handler wishes to interpret them.
7109 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7111 if (info->raid_disks == 0) {
7112 /* just setting version number for superblock loading */
7113 if (info->major_version < 0 ||
7114 info->major_version >= ARRAY_SIZE(super_types) ||
7115 super_types[info->major_version].name == NULL) {
7116 /* maybe try to auto-load a module? */
7117 pr_warn("md: superblock version %d not known\n",
7118 info->major_version);
7121 mddev->major_version = info->major_version;
7122 mddev->minor_version = info->minor_version;
7123 mddev->patch_version = info->patch_version;
7124 mddev->persistent = !info->not_persistent;
7125 /* ensure mddev_put doesn't delete this now that there
7126 * is some minimal configuration.
7128 mddev->ctime = ktime_get_real_seconds();
7131 mddev->major_version = MD_MAJOR_VERSION;
7132 mddev->minor_version = MD_MINOR_VERSION;
7133 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7134 mddev->ctime = ktime_get_real_seconds();
7136 mddev->level = info->level;
7137 mddev->clevel[0] = 0;
7138 mddev->dev_sectors = 2 * (sector_t)info->size;
7139 mddev->raid_disks = info->raid_disks;
7140 /* don't set md_minor, it is determined by which /dev/md* was
7143 if (info->state & (1<<MD_SB_CLEAN))
7144 mddev->recovery_cp = MaxSector;
7146 mddev->recovery_cp = 0;
7147 mddev->persistent = ! info->not_persistent;
7148 mddev->external = 0;
7150 mddev->layout = info->layout;
7151 if (mddev->level == 0)
7152 /* Cannot trust RAID0 layout info here */
7154 mddev->chunk_sectors = info->chunk_size >> 9;
7156 if (mddev->persistent) {
7157 mddev->max_disks = MD_SB_DISKS;
7159 mddev->sb_flags = 0;
7161 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7163 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7164 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7165 mddev->bitmap_info.offset = 0;
7167 mddev->reshape_position = MaxSector;
7170 * Generate a 128 bit UUID
7172 get_random_bytes(mddev->uuid, 16);
7174 mddev->new_level = mddev->level;
7175 mddev->new_chunk_sectors = mddev->chunk_sectors;
7176 mddev->new_layout = mddev->layout;
7177 mddev->delta_disks = 0;
7178 mddev->reshape_backwards = 0;
7183 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7185 lockdep_assert_held(&mddev->reconfig_mutex);
7187 if (mddev->external_size)
7190 mddev->array_sectors = array_sectors;
7192 EXPORT_SYMBOL(md_set_array_sectors);
7194 static int update_size(struct mddev *mddev, sector_t num_sectors)
7196 struct md_rdev *rdev;
7198 int fit = (num_sectors == 0);
7199 sector_t old_dev_sectors = mddev->dev_sectors;
7201 if (mddev->pers->resize == NULL)
7203 /* The "num_sectors" is the number of sectors of each device that
7204 * is used. This can only make sense for arrays with redundancy.
7205 * linear and raid0 always use whatever space is available. We can only
7206 * consider changing this number if no resync or reconstruction is
7207 * happening, and if the new size is acceptable. It must fit before the
7208 * sb_start or, if that is <data_offset, it must fit before the size
7209 * of each device. If num_sectors is zero, we find the largest size
7212 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7218 rdev_for_each(rdev, mddev) {
7219 sector_t avail = rdev->sectors;
7221 if (fit && (num_sectors == 0 || num_sectors > avail))
7222 num_sectors = avail;
7223 if (avail < num_sectors)
7226 rv = mddev->pers->resize(mddev, num_sectors);
7228 if (mddev_is_clustered(mddev))
7229 md_cluster_ops->update_size(mddev, old_dev_sectors);
7230 else if (mddev->queue) {
7231 set_capacity_and_notify(mddev->gendisk,
7232 mddev->array_sectors);
7238 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7241 struct md_rdev *rdev;
7242 /* change the number of raid disks */
7243 if (mddev->pers->check_reshape == NULL)
7247 if (raid_disks <= 0 ||
7248 (mddev->max_disks && raid_disks >= mddev->max_disks))
7250 if (mddev->sync_thread ||
7251 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7252 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7253 mddev->reshape_position != MaxSector)
7256 rdev_for_each(rdev, mddev) {
7257 if (mddev->raid_disks < raid_disks &&
7258 rdev->data_offset < rdev->new_data_offset)
7260 if (mddev->raid_disks > raid_disks &&
7261 rdev->data_offset > rdev->new_data_offset)
7265 mddev->delta_disks = raid_disks - mddev->raid_disks;
7266 if (mddev->delta_disks < 0)
7267 mddev->reshape_backwards = 1;
7268 else if (mddev->delta_disks > 0)
7269 mddev->reshape_backwards = 0;
7271 rv = mddev->pers->check_reshape(mddev);
7273 mddev->delta_disks = 0;
7274 mddev->reshape_backwards = 0;
7280 * update_array_info is used to change the configuration of an
7282 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7283 * fields in the info are checked against the array.
7284 * Any differences that cannot be handled will cause an error.
7285 * Normally, only one change can be managed at a time.
7287 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7293 /* calculate expected state,ignoring low bits */
7294 if (mddev->bitmap && mddev->bitmap_info.offset)
7295 state |= (1 << MD_SB_BITMAP_PRESENT);
7297 if (mddev->major_version != info->major_version ||
7298 mddev->minor_version != info->minor_version ||
7299 /* mddev->patch_version != info->patch_version || */
7300 mddev->ctime != info->ctime ||
7301 mddev->level != info->level ||
7302 /* mddev->layout != info->layout || */
7303 mddev->persistent != !info->not_persistent ||
7304 mddev->chunk_sectors != info->chunk_size >> 9 ||
7305 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7306 ((state^info->state) & 0xfffffe00)
7309 /* Check there is only one change */
7310 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7312 if (mddev->raid_disks != info->raid_disks)
7314 if (mddev->layout != info->layout)
7316 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7323 if (mddev->layout != info->layout) {
7325 * we don't need to do anything at the md level, the
7326 * personality will take care of it all.
7328 if (mddev->pers->check_reshape == NULL)
7331 mddev->new_layout = info->layout;
7332 rv = mddev->pers->check_reshape(mddev);
7334 mddev->new_layout = mddev->layout;
7338 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7339 rv = update_size(mddev, (sector_t)info->size * 2);
7341 if (mddev->raid_disks != info->raid_disks)
7342 rv = update_raid_disks(mddev, info->raid_disks);
7344 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7345 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7349 if (mddev->recovery || mddev->sync_thread) {
7353 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7354 struct bitmap *bitmap;
7355 /* add the bitmap */
7356 if (mddev->bitmap) {
7360 if (mddev->bitmap_info.default_offset == 0) {
7364 mddev->bitmap_info.offset =
7365 mddev->bitmap_info.default_offset;
7366 mddev->bitmap_info.space =
7367 mddev->bitmap_info.default_space;
7368 bitmap = md_bitmap_create(mddev, -1);
7369 mddev_suspend(mddev);
7370 if (!IS_ERR(bitmap)) {
7371 mddev->bitmap = bitmap;
7372 rv = md_bitmap_load(mddev);
7374 rv = PTR_ERR(bitmap);
7376 md_bitmap_destroy(mddev);
7377 mddev_resume(mddev);
7379 /* remove the bitmap */
7380 if (!mddev->bitmap) {
7384 if (mddev->bitmap->storage.file) {
7388 if (mddev->bitmap_info.nodes) {
7389 /* hold PW on all the bitmap lock */
7390 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7391 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7393 md_cluster_ops->unlock_all_bitmaps(mddev);
7397 mddev->bitmap_info.nodes = 0;
7398 md_cluster_ops->leave(mddev);
7399 module_put(md_cluster_mod);
7400 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7402 mddev_suspend(mddev);
7403 md_bitmap_destroy(mddev);
7404 mddev_resume(mddev);
7405 mddev->bitmap_info.offset = 0;
7408 md_update_sb(mddev, 1);
7414 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7416 struct md_rdev *rdev;
7419 if (mddev->pers == NULL)
7423 rdev = md_find_rdev_rcu(mddev, dev);
7427 md_error(mddev, rdev);
7428 if (!test_bit(Faulty, &rdev->flags))
7436 * We have a problem here : there is no easy way to give a CHS
7437 * virtual geometry. We currently pretend that we have a 2 heads
7438 * 4 sectors (with a BIG number of cylinders...). This drives
7439 * dosfs just mad... ;-)
7441 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7443 struct mddev *mddev = bdev->bd_disk->private_data;
7447 geo->cylinders = mddev->array_sectors / 8;
7451 static inline bool md_ioctl_valid(unsigned int cmd)
7455 case GET_ARRAY_INFO:
7456 case GET_BITMAP_FILE:
7459 case HOT_REMOVE_DISK:
7461 case RESTART_ARRAY_RW:
7463 case SET_ARRAY_INFO:
7464 case SET_BITMAP_FILE:
7465 case SET_DISK_FAULTY:
7468 case CLUSTERED_DISK_NACK:
7475 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7476 unsigned int cmd, unsigned long arg)
7479 void __user *argp = (void __user *)arg;
7480 struct mddev *mddev = NULL;
7481 bool did_set_md_closing = false;
7483 if (!md_ioctl_valid(cmd))
7488 case GET_ARRAY_INFO:
7492 if (!capable(CAP_SYS_ADMIN))
7497 * Commands dealing with the RAID driver but not any
7502 err = get_version(argp);
7508 * Commands creating/starting a new array:
7511 mddev = bdev->bd_disk->private_data;
7518 /* Some actions do not requires the mutex */
7520 case GET_ARRAY_INFO:
7521 if (!mddev->raid_disks && !mddev->external)
7524 err = get_array_info(mddev, argp);
7528 if (!mddev->raid_disks && !mddev->external)
7531 err = get_disk_info(mddev, argp);
7534 case SET_DISK_FAULTY:
7535 err = set_disk_faulty(mddev, new_decode_dev(arg));
7538 case GET_BITMAP_FILE:
7539 err = get_bitmap_file(mddev, argp);
7544 if (cmd == ADD_NEW_DISK || cmd == HOT_ADD_DISK)
7545 flush_rdev_wq(mddev);
7547 if (cmd == HOT_REMOVE_DISK)
7548 /* need to ensure recovery thread has run */
7549 wait_event_interruptible_timeout(mddev->sb_wait,
7550 !test_bit(MD_RECOVERY_NEEDED,
7552 msecs_to_jiffies(5000));
7553 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7554 /* Need to flush page cache, and ensure no-one else opens
7557 mutex_lock(&mddev->open_mutex);
7558 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7559 mutex_unlock(&mddev->open_mutex);
7563 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7564 mutex_unlock(&mddev->open_mutex);
7568 did_set_md_closing = true;
7569 mutex_unlock(&mddev->open_mutex);
7570 sync_blockdev(bdev);
7572 err = mddev_lock(mddev);
7574 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7579 if (cmd == SET_ARRAY_INFO) {
7580 mdu_array_info_t info;
7582 memset(&info, 0, sizeof(info));
7583 else if (copy_from_user(&info, argp, sizeof(info))) {
7588 err = update_array_info(mddev, &info);
7590 pr_warn("md: couldn't update array info. %d\n", err);
7595 if (!list_empty(&mddev->disks)) {
7596 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7600 if (mddev->raid_disks) {
7601 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7605 err = md_set_array_info(mddev, &info);
7607 pr_warn("md: couldn't set array info. %d\n", err);
7614 * Commands querying/configuring an existing array:
7616 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7617 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7618 if ((!mddev->raid_disks && !mddev->external)
7619 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7620 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7621 && cmd != GET_BITMAP_FILE) {
7627 * Commands even a read-only array can execute:
7630 case RESTART_ARRAY_RW:
7631 err = restart_array(mddev);
7635 err = do_md_stop(mddev, 0, bdev);
7639 err = md_set_readonly(mddev, bdev);
7642 case HOT_REMOVE_DISK:
7643 err = hot_remove_disk(mddev, new_decode_dev(arg));
7647 /* We can support ADD_NEW_DISK on read-only arrays
7648 * only if we are re-adding a preexisting device.
7649 * So require mddev->pers and MD_DISK_SYNC.
7652 mdu_disk_info_t info;
7653 if (copy_from_user(&info, argp, sizeof(info)))
7655 else if (!(info.state & (1<<MD_DISK_SYNC)))
7656 /* Need to clear read-only for this */
7659 err = md_add_new_disk(mddev, &info);
7666 * The remaining ioctls are changing the state of the
7667 * superblock, so we do not allow them on read-only arrays.
7669 if (mddev->ro && mddev->pers) {
7670 if (mddev->ro == 2) {
7672 sysfs_notify_dirent_safe(mddev->sysfs_state);
7673 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7674 /* mddev_unlock will wake thread */
7675 /* If a device failed while we were read-only, we
7676 * need to make sure the metadata is updated now.
7678 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7679 mddev_unlock(mddev);
7680 wait_event(mddev->sb_wait,
7681 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7682 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7683 mddev_lock_nointr(mddev);
7694 mdu_disk_info_t info;
7695 if (copy_from_user(&info, argp, sizeof(info)))
7698 err = md_add_new_disk(mddev, &info);
7702 case CLUSTERED_DISK_NACK:
7703 if (mddev_is_clustered(mddev))
7704 md_cluster_ops->new_disk_ack(mddev, false);
7710 err = hot_add_disk(mddev, new_decode_dev(arg));
7714 err = do_md_run(mddev);
7717 case SET_BITMAP_FILE:
7718 err = set_bitmap_file(mddev, (int)arg);
7727 if (mddev->hold_active == UNTIL_IOCTL &&
7729 mddev->hold_active = 0;
7730 mddev_unlock(mddev);
7732 if(did_set_md_closing)
7733 clear_bit(MD_CLOSING, &mddev->flags);
7736 #ifdef CONFIG_COMPAT
7737 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7738 unsigned int cmd, unsigned long arg)
7741 case HOT_REMOVE_DISK:
7743 case SET_DISK_FAULTY:
7744 case SET_BITMAP_FILE:
7745 /* These take in integer arg, do not convert */
7748 arg = (unsigned long)compat_ptr(arg);
7752 return md_ioctl(bdev, mode, cmd, arg);
7754 #endif /* CONFIG_COMPAT */
7756 static int md_set_read_only(struct block_device *bdev, bool ro)
7758 struct mddev *mddev = bdev->bd_disk->private_data;
7761 err = mddev_lock(mddev);
7765 if (!mddev->raid_disks && !mddev->external) {
7771 * Transitioning to read-auto need only happen for arrays that call
7772 * md_write_start and which are not ready for writes yet.
7774 if (!ro && mddev->ro == 1 && mddev->pers) {
7775 err = restart_array(mddev);
7782 mddev_unlock(mddev);
7786 static int md_open(struct block_device *bdev, fmode_t mode)
7789 * Succeed if we can lock the mddev, which confirms that
7790 * it isn't being stopped right now.
7792 struct mddev *mddev = mddev_find(bdev->bd_dev);
7798 if (mddev->gendisk != bdev->bd_disk) {
7799 /* we are racing with mddev_put which is discarding this
7803 /* Wait until bdev->bd_disk is definitely gone */
7804 if (work_pending(&mddev->del_work))
7805 flush_workqueue(md_misc_wq);
7808 BUG_ON(mddev != bdev->bd_disk->private_data);
7810 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7813 if (test_bit(MD_CLOSING, &mddev->flags)) {
7814 mutex_unlock(&mddev->open_mutex);
7820 atomic_inc(&mddev->openers);
7821 mutex_unlock(&mddev->open_mutex);
7823 bdev_check_media_change(bdev);
7830 static void md_release(struct gendisk *disk, fmode_t mode)
7832 struct mddev *mddev = disk->private_data;
7835 atomic_dec(&mddev->openers);
7839 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7841 struct mddev *mddev = disk->private_data;
7842 unsigned int ret = 0;
7845 ret = DISK_EVENT_MEDIA_CHANGE;
7850 const struct block_device_operations md_fops =
7852 .owner = THIS_MODULE,
7853 .submit_bio = md_submit_bio,
7855 .release = md_release,
7857 #ifdef CONFIG_COMPAT
7858 .compat_ioctl = md_compat_ioctl,
7860 .getgeo = md_getgeo,
7861 .check_events = md_check_events,
7862 .set_read_only = md_set_read_only,
7865 static int md_thread(void *arg)
7867 struct md_thread *thread = arg;
7870 * md_thread is a 'system-thread', it's priority should be very
7871 * high. We avoid resource deadlocks individually in each
7872 * raid personality. (RAID5 does preallocation) We also use RR and
7873 * the very same RT priority as kswapd, thus we will never get
7874 * into a priority inversion deadlock.
7876 * we definitely have to have equal or higher priority than
7877 * bdflush, otherwise bdflush will deadlock if there are too
7878 * many dirty RAID5 blocks.
7881 allow_signal(SIGKILL);
7882 while (!kthread_should_stop()) {
7884 /* We need to wait INTERRUPTIBLE so that
7885 * we don't add to the load-average.
7886 * That means we need to be sure no signals are
7889 if (signal_pending(current))
7890 flush_signals(current);
7892 wait_event_interruptible_timeout
7894 test_bit(THREAD_WAKEUP, &thread->flags)
7895 || kthread_should_stop() || kthread_should_park(),
7898 clear_bit(THREAD_WAKEUP, &thread->flags);
7899 if (kthread_should_park())
7901 if (!kthread_should_stop())
7902 thread->run(thread);
7908 void md_wakeup_thread(struct md_thread *thread)
7911 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7912 set_bit(THREAD_WAKEUP, &thread->flags);
7913 wake_up(&thread->wqueue);
7916 EXPORT_SYMBOL(md_wakeup_thread);
7918 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7919 struct mddev *mddev, const char *name)
7921 struct md_thread *thread;
7923 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7927 init_waitqueue_head(&thread->wqueue);
7930 thread->mddev = mddev;
7931 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7932 thread->tsk = kthread_run(md_thread, thread,
7934 mdname(thread->mddev),
7936 if (IS_ERR(thread->tsk)) {
7942 EXPORT_SYMBOL(md_register_thread);
7944 void md_unregister_thread(struct md_thread **threadp)
7946 struct md_thread *thread = *threadp;
7949 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7950 /* Locking ensures that mddev_unlock does not wake_up a
7951 * non-existent thread
7953 spin_lock(&pers_lock);
7955 spin_unlock(&pers_lock);
7957 kthread_stop(thread->tsk);
7960 EXPORT_SYMBOL(md_unregister_thread);
7962 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7964 if (!rdev || test_bit(Faulty, &rdev->flags))
7967 if (!mddev->pers || !mddev->pers->error_handler)
7969 mddev->pers->error_handler(mddev,rdev);
7970 if (mddev->degraded)
7971 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7972 sysfs_notify_dirent_safe(rdev->sysfs_state);
7973 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7974 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7975 md_wakeup_thread(mddev->thread);
7976 if (mddev->event_work.func)
7977 queue_work(md_misc_wq, &mddev->event_work);
7978 md_new_event(mddev);
7980 EXPORT_SYMBOL(md_error);
7982 /* seq_file implementation /proc/mdstat */
7984 static void status_unused(struct seq_file *seq)
7987 struct md_rdev *rdev;
7989 seq_printf(seq, "unused devices: ");
7991 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7992 char b[BDEVNAME_SIZE];
7994 seq_printf(seq, "%s ",
7995 bdevname(rdev->bdev,b));
7998 seq_printf(seq, "<none>");
8000 seq_printf(seq, "\n");
8003 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8005 sector_t max_sectors, resync, res;
8006 unsigned long dt, db = 0;
8007 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8008 int scale, recovery_active;
8009 unsigned int per_milli;
8011 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8012 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8013 max_sectors = mddev->resync_max_sectors;
8015 max_sectors = mddev->dev_sectors;
8017 resync = mddev->curr_resync;
8019 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8020 /* Still cleaning up */
8021 resync = max_sectors;
8022 } else if (resync > max_sectors)
8023 resync = max_sectors;
8025 resync -= atomic_read(&mddev->recovery_active);
8028 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8029 struct md_rdev *rdev;
8031 rdev_for_each(rdev, mddev)
8032 if (rdev->raid_disk >= 0 &&
8033 !test_bit(Faulty, &rdev->flags) &&
8034 rdev->recovery_offset != MaxSector &&
8035 rdev->recovery_offset) {
8036 seq_printf(seq, "\trecover=REMOTE");
8039 if (mddev->reshape_position != MaxSector)
8040 seq_printf(seq, "\treshape=REMOTE");
8042 seq_printf(seq, "\tresync=REMOTE");
8045 if (mddev->recovery_cp < MaxSector) {
8046 seq_printf(seq, "\tresync=PENDING");
8052 seq_printf(seq, "\tresync=DELAYED");
8056 WARN_ON(max_sectors == 0);
8057 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8058 * in a sector_t, and (max_sectors>>scale) will fit in a
8059 * u32, as those are the requirements for sector_div.
8060 * Thus 'scale' must be at least 10
8063 if (sizeof(sector_t) > sizeof(unsigned long)) {
8064 while ( max_sectors/2 > (1ULL<<(scale+32)))
8067 res = (resync>>scale)*1000;
8068 sector_div(res, (u32)((max_sectors>>scale)+1));
8072 int i, x = per_milli/50, y = 20-x;
8073 seq_printf(seq, "[");
8074 for (i = 0; i < x; i++)
8075 seq_printf(seq, "=");
8076 seq_printf(seq, ">");
8077 for (i = 0; i < y; i++)
8078 seq_printf(seq, ".");
8079 seq_printf(seq, "] ");
8081 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8082 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8084 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8086 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8087 "resync" : "recovery"))),
8088 per_milli/10, per_milli % 10,
8089 (unsigned long long) resync/2,
8090 (unsigned long long) max_sectors/2);
8093 * dt: time from mark until now
8094 * db: blocks written from mark until now
8095 * rt: remaining time
8097 * rt is a sector_t, which is always 64bit now. We are keeping
8098 * the original algorithm, but it is not really necessary.
8100 * Original algorithm:
8101 * So we divide before multiply in case it is 32bit and close
8103 * We scale the divisor (db) by 32 to avoid losing precision
8104 * near the end of resync when the number of remaining sectors
8106 * We then divide rt by 32 after multiplying by db to compensate.
8107 * The '+1' avoids division by zero if db is very small.
8109 dt = ((jiffies - mddev->resync_mark) / HZ);
8112 curr_mark_cnt = mddev->curr_mark_cnt;
8113 recovery_active = atomic_read(&mddev->recovery_active);
8114 resync_mark_cnt = mddev->resync_mark_cnt;
8116 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8117 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8119 rt = max_sectors - resync; /* number of remaining sectors */
8120 rt = div64_u64(rt, db/32+1);
8124 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8125 ((unsigned long)rt % 60)/6);
8127 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8131 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8133 struct list_head *tmp;
8135 struct mddev *mddev;
8147 spin_lock(&all_mddevs_lock);
8148 list_for_each(tmp,&all_mddevs)
8150 mddev = list_entry(tmp, struct mddev, all_mddevs);
8152 spin_unlock(&all_mddevs_lock);
8155 spin_unlock(&all_mddevs_lock);
8157 return (void*)2;/* tail */
8161 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8163 struct list_head *tmp;
8164 struct mddev *next_mddev, *mddev = v;
8170 spin_lock(&all_mddevs_lock);
8172 tmp = all_mddevs.next;
8174 tmp = mddev->all_mddevs.next;
8175 if (tmp != &all_mddevs)
8176 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8178 next_mddev = (void*)2;
8181 spin_unlock(&all_mddevs_lock);
8189 static void md_seq_stop(struct seq_file *seq, void *v)
8191 struct mddev *mddev = v;
8193 if (mddev && v != (void*)1 && v != (void*)2)
8197 static int md_seq_show(struct seq_file *seq, void *v)
8199 struct mddev *mddev = v;
8201 struct md_rdev *rdev;
8203 if (v == (void*)1) {
8204 struct md_personality *pers;
8205 seq_printf(seq, "Personalities : ");
8206 spin_lock(&pers_lock);
8207 list_for_each_entry(pers, &pers_list, list)
8208 seq_printf(seq, "[%s] ", pers->name);
8210 spin_unlock(&pers_lock);
8211 seq_printf(seq, "\n");
8212 seq->poll_event = atomic_read(&md_event_count);
8215 if (v == (void*)2) {
8220 spin_lock(&mddev->lock);
8221 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8222 seq_printf(seq, "%s : %sactive", mdname(mddev),
8223 mddev->pers ? "" : "in");
8226 seq_printf(seq, " (read-only)");
8228 seq_printf(seq, " (auto-read-only)");
8229 seq_printf(seq, " %s", mddev->pers->name);
8234 rdev_for_each_rcu(rdev, mddev) {
8235 char b[BDEVNAME_SIZE];
8236 seq_printf(seq, " %s[%d]",
8237 bdevname(rdev->bdev,b), rdev->desc_nr);
8238 if (test_bit(WriteMostly, &rdev->flags))
8239 seq_printf(seq, "(W)");
8240 if (test_bit(Journal, &rdev->flags))
8241 seq_printf(seq, "(J)");
8242 if (test_bit(Faulty, &rdev->flags)) {
8243 seq_printf(seq, "(F)");
8246 if (rdev->raid_disk < 0)
8247 seq_printf(seq, "(S)"); /* spare */
8248 if (test_bit(Replacement, &rdev->flags))
8249 seq_printf(seq, "(R)");
8250 sectors += rdev->sectors;
8254 if (!list_empty(&mddev->disks)) {
8256 seq_printf(seq, "\n %llu blocks",
8257 (unsigned long long)
8258 mddev->array_sectors / 2);
8260 seq_printf(seq, "\n %llu blocks",
8261 (unsigned long long)sectors / 2);
8263 if (mddev->persistent) {
8264 if (mddev->major_version != 0 ||
8265 mddev->minor_version != 90) {
8266 seq_printf(seq," super %d.%d",
8267 mddev->major_version,
8268 mddev->minor_version);
8270 } else if (mddev->external)
8271 seq_printf(seq, " super external:%s",
8272 mddev->metadata_type);
8274 seq_printf(seq, " super non-persistent");
8277 mddev->pers->status(seq, mddev);
8278 seq_printf(seq, "\n ");
8279 if (mddev->pers->sync_request) {
8280 if (status_resync(seq, mddev))
8281 seq_printf(seq, "\n ");
8284 seq_printf(seq, "\n ");
8286 md_bitmap_status(seq, mddev->bitmap);
8288 seq_printf(seq, "\n");
8290 spin_unlock(&mddev->lock);
8295 static const struct seq_operations md_seq_ops = {
8296 .start = md_seq_start,
8297 .next = md_seq_next,
8298 .stop = md_seq_stop,
8299 .show = md_seq_show,
8302 static int md_seq_open(struct inode *inode, struct file *file)
8304 struct seq_file *seq;
8307 error = seq_open(file, &md_seq_ops);
8311 seq = file->private_data;
8312 seq->poll_event = atomic_read(&md_event_count);
8316 static int md_unloading;
8317 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8319 struct seq_file *seq = filp->private_data;
8323 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8324 poll_wait(filp, &md_event_waiters, wait);
8326 /* always allow read */
8327 mask = EPOLLIN | EPOLLRDNORM;
8329 if (seq->poll_event != atomic_read(&md_event_count))
8330 mask |= EPOLLERR | EPOLLPRI;
8334 static const struct proc_ops mdstat_proc_ops = {
8335 .proc_open = md_seq_open,
8336 .proc_read = seq_read,
8337 .proc_lseek = seq_lseek,
8338 .proc_release = seq_release,
8339 .proc_poll = mdstat_poll,
8342 int register_md_personality(struct md_personality *p)
8344 pr_debug("md: %s personality registered for level %d\n",
8346 spin_lock(&pers_lock);
8347 list_add_tail(&p->list, &pers_list);
8348 spin_unlock(&pers_lock);
8351 EXPORT_SYMBOL(register_md_personality);
8353 int unregister_md_personality(struct md_personality *p)
8355 pr_debug("md: %s personality unregistered\n", p->name);
8356 spin_lock(&pers_lock);
8357 list_del_init(&p->list);
8358 spin_unlock(&pers_lock);
8361 EXPORT_SYMBOL(unregister_md_personality);
8363 int register_md_cluster_operations(struct md_cluster_operations *ops,
8364 struct module *module)
8367 spin_lock(&pers_lock);
8368 if (md_cluster_ops != NULL)
8371 md_cluster_ops = ops;
8372 md_cluster_mod = module;
8374 spin_unlock(&pers_lock);
8377 EXPORT_SYMBOL(register_md_cluster_operations);
8379 int unregister_md_cluster_operations(void)
8381 spin_lock(&pers_lock);
8382 md_cluster_ops = NULL;
8383 spin_unlock(&pers_lock);
8386 EXPORT_SYMBOL(unregister_md_cluster_operations);
8388 int md_setup_cluster(struct mddev *mddev, int nodes)
8391 if (!md_cluster_ops)
8392 request_module("md-cluster");
8393 spin_lock(&pers_lock);
8394 /* ensure module won't be unloaded */
8395 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8396 pr_warn("can't find md-cluster module or get it's reference.\n");
8397 spin_unlock(&pers_lock);
8400 spin_unlock(&pers_lock);
8402 ret = md_cluster_ops->join(mddev, nodes);
8404 mddev->safemode_delay = 0;
8408 void md_cluster_stop(struct mddev *mddev)
8410 if (!md_cluster_ops)
8412 md_cluster_ops->leave(mddev);
8413 module_put(md_cluster_mod);
8416 static int is_mddev_idle(struct mddev *mddev, int init)
8418 struct md_rdev *rdev;
8424 rdev_for_each_rcu(rdev, mddev) {
8425 struct gendisk *disk = rdev->bdev->bd_disk;
8426 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8427 atomic_read(&disk->sync_io);
8428 /* sync IO will cause sync_io to increase before the disk_stats
8429 * as sync_io is counted when a request starts, and
8430 * disk_stats is counted when it completes.
8431 * So resync activity will cause curr_events to be smaller than
8432 * when there was no such activity.
8433 * non-sync IO will cause disk_stat to increase without
8434 * increasing sync_io so curr_events will (eventually)
8435 * be larger than it was before. Once it becomes
8436 * substantially larger, the test below will cause
8437 * the array to appear non-idle, and resync will slow
8439 * If there is a lot of outstanding resync activity when
8440 * we set last_event to curr_events, then all that activity
8441 * completing might cause the array to appear non-idle
8442 * and resync will be slowed down even though there might
8443 * not have been non-resync activity. This will only
8444 * happen once though. 'last_events' will soon reflect
8445 * the state where there is little or no outstanding
8446 * resync requests, and further resync activity will
8447 * always make curr_events less than last_events.
8450 if (init || curr_events - rdev->last_events > 64) {
8451 rdev->last_events = curr_events;
8459 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8461 /* another "blocks" (512byte) blocks have been synced */
8462 atomic_sub(blocks, &mddev->recovery_active);
8463 wake_up(&mddev->recovery_wait);
8465 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8466 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8467 md_wakeup_thread(mddev->thread);
8468 // stop recovery, signal do_sync ....
8471 EXPORT_SYMBOL(md_done_sync);
8473 /* md_write_start(mddev, bi)
8474 * If we need to update some array metadata (e.g. 'active' flag
8475 * in superblock) before writing, schedule a superblock update
8476 * and wait for it to complete.
8477 * A return value of 'false' means that the write wasn't recorded
8478 * and cannot proceed as the array is being suspend.
8480 bool md_write_start(struct mddev *mddev, struct bio *bi)
8484 if (bio_data_dir(bi) != WRITE)
8487 BUG_ON(mddev->ro == 1);
8488 if (mddev->ro == 2) {
8489 /* need to switch to read/write */
8491 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8492 md_wakeup_thread(mddev->thread);
8493 md_wakeup_thread(mddev->sync_thread);
8497 percpu_ref_get(&mddev->writes_pending);
8498 smp_mb(); /* Match smp_mb in set_in_sync() */
8499 if (mddev->safemode == 1)
8500 mddev->safemode = 0;
8501 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8502 if (mddev->in_sync || mddev->sync_checkers) {
8503 spin_lock(&mddev->lock);
8504 if (mddev->in_sync) {
8506 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8507 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8508 md_wakeup_thread(mddev->thread);
8511 spin_unlock(&mddev->lock);
8515 sysfs_notify_dirent_safe(mddev->sysfs_state);
8516 if (!mddev->has_superblocks)
8518 wait_event(mddev->sb_wait,
8519 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8521 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8522 percpu_ref_put(&mddev->writes_pending);
8527 EXPORT_SYMBOL(md_write_start);
8529 /* md_write_inc can only be called when md_write_start() has
8530 * already been called at least once of the current request.
8531 * It increments the counter and is useful when a single request
8532 * is split into several parts. Each part causes an increment and
8533 * so needs a matching md_write_end().
8534 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8535 * a spinlocked region.
8537 void md_write_inc(struct mddev *mddev, struct bio *bi)
8539 if (bio_data_dir(bi) != WRITE)
8541 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8542 percpu_ref_get(&mddev->writes_pending);
8544 EXPORT_SYMBOL(md_write_inc);
8546 void md_write_end(struct mddev *mddev)
8548 percpu_ref_put(&mddev->writes_pending);
8550 if (mddev->safemode == 2)
8551 md_wakeup_thread(mddev->thread);
8552 else if (mddev->safemode_delay)
8553 /* The roundup() ensures this only performs locking once
8554 * every ->safemode_delay jiffies
8556 mod_timer(&mddev->safemode_timer,
8557 roundup(jiffies, mddev->safemode_delay) +
8558 mddev->safemode_delay);
8561 EXPORT_SYMBOL(md_write_end);
8563 /* This is used by raid0 and raid10 */
8564 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8565 struct bio *bio, sector_t start, sector_t size)
8567 struct bio *discard_bio = NULL;
8569 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO, 0,
8570 &discard_bio) || !discard_bio)
8573 bio_chain(discard_bio, bio);
8574 bio_clone_blkg_association(discard_bio, bio);
8576 trace_block_bio_remap(discard_bio,
8577 disk_devt(mddev->gendisk),
8578 bio->bi_iter.bi_sector);
8579 submit_bio_noacct(discard_bio);
8581 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8583 int acct_bioset_init(struct mddev *mddev)
8587 if (!bioset_initialized(&mddev->io_acct_set))
8588 err = bioset_init(&mddev->io_acct_set, BIO_POOL_SIZE,
8589 offsetof(struct md_io_acct, bio_clone), 0);
8592 EXPORT_SYMBOL_GPL(acct_bioset_init);
8594 void acct_bioset_exit(struct mddev *mddev)
8596 bioset_exit(&mddev->io_acct_set);
8598 EXPORT_SYMBOL_GPL(acct_bioset_exit);
8600 static void md_end_io_acct(struct bio *bio)
8602 struct md_io_acct *md_io_acct = bio->bi_private;
8603 struct bio *orig_bio = md_io_acct->orig_bio;
8605 orig_bio->bi_status = bio->bi_status;
8607 bio_end_io_acct(orig_bio, md_io_acct->start_time);
8609 bio_endio(orig_bio);
8613 * Used by personalities that don't already clone the bio and thus can't
8614 * easily add the timestamp to their extended bio structure.
8616 void md_account_bio(struct mddev *mddev, struct bio **bio)
8618 struct md_io_acct *md_io_acct;
8621 if (!blk_queue_io_stat((*bio)->bi_bdev->bd_disk->queue))
8624 clone = bio_clone_fast(*bio, GFP_NOIO, &mddev->io_acct_set);
8625 md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
8626 md_io_acct->orig_bio = *bio;
8627 md_io_acct->start_time = bio_start_io_acct(*bio);
8629 clone->bi_end_io = md_end_io_acct;
8630 clone->bi_private = md_io_acct;
8633 EXPORT_SYMBOL_GPL(md_account_bio);
8635 /* md_allow_write(mddev)
8636 * Calling this ensures that the array is marked 'active' so that writes
8637 * may proceed without blocking. It is important to call this before
8638 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8639 * Must be called with mddev_lock held.
8641 void md_allow_write(struct mddev *mddev)
8647 if (!mddev->pers->sync_request)
8650 spin_lock(&mddev->lock);
8651 if (mddev->in_sync) {
8653 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8654 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8655 if (mddev->safemode_delay &&
8656 mddev->safemode == 0)
8657 mddev->safemode = 1;
8658 spin_unlock(&mddev->lock);
8659 md_update_sb(mddev, 0);
8660 sysfs_notify_dirent_safe(mddev->sysfs_state);
8661 /* wait for the dirty state to be recorded in the metadata */
8662 wait_event(mddev->sb_wait,
8663 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8665 spin_unlock(&mddev->lock);
8667 EXPORT_SYMBOL_GPL(md_allow_write);
8669 #define SYNC_MARKS 10
8670 #define SYNC_MARK_STEP (3*HZ)
8671 #define UPDATE_FREQUENCY (5*60*HZ)
8672 void md_do_sync(struct md_thread *thread)
8674 struct mddev *mddev = thread->mddev;
8675 struct mddev *mddev2;
8676 unsigned int currspeed = 0, window;
8677 sector_t max_sectors,j, io_sectors, recovery_done;
8678 unsigned long mark[SYNC_MARKS];
8679 unsigned long update_time;
8680 sector_t mark_cnt[SYNC_MARKS];
8682 struct list_head *tmp;
8683 sector_t last_check;
8685 struct md_rdev *rdev;
8686 char *desc, *action = NULL;
8687 struct blk_plug plug;
8690 /* just incase thread restarts... */
8691 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8692 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8694 if (mddev->ro) {/* never try to sync a read-only array */
8695 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8699 if (mddev_is_clustered(mddev)) {
8700 ret = md_cluster_ops->resync_start(mddev);
8704 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8705 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8706 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8707 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8708 && ((unsigned long long)mddev->curr_resync_completed
8709 < (unsigned long long)mddev->resync_max_sectors))
8713 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8714 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8715 desc = "data-check";
8717 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8718 desc = "requested-resync";
8722 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8727 mddev->last_sync_action = action ?: desc;
8729 /* we overload curr_resync somewhat here.
8730 * 0 == not engaged in resync at all
8731 * 2 == checking that there is no conflict with another sync
8732 * 1 == like 2, but have yielded to allow conflicting resync to
8734 * other == active in resync - this many blocks
8736 * Before starting a resync we must have set curr_resync to
8737 * 2, and then checked that every "conflicting" array has curr_resync
8738 * less than ours. When we find one that is the same or higher
8739 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8740 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8741 * This will mean we have to start checking from the beginning again.
8746 int mddev2_minor = -1;
8747 mddev->curr_resync = 2;
8750 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8752 for_each_mddev(mddev2, tmp) {
8753 if (mddev2 == mddev)
8755 if (!mddev->parallel_resync
8756 && mddev2->curr_resync
8757 && match_mddev_units(mddev, mddev2)) {
8759 if (mddev < mddev2 && mddev->curr_resync == 2) {
8760 /* arbitrarily yield */
8761 mddev->curr_resync = 1;
8762 wake_up(&resync_wait);
8764 if (mddev > mddev2 && mddev->curr_resync == 1)
8765 /* no need to wait here, we can wait the next
8766 * time 'round when curr_resync == 2
8769 /* We need to wait 'interruptible' so as not to
8770 * contribute to the load average, and not to
8771 * be caught by 'softlockup'
8773 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8774 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8775 mddev2->curr_resync >= mddev->curr_resync) {
8776 if (mddev2_minor != mddev2->md_minor) {
8777 mddev2_minor = mddev2->md_minor;
8778 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8779 desc, mdname(mddev),
8783 if (signal_pending(current))
8784 flush_signals(current);
8786 finish_wait(&resync_wait, &wq);
8789 finish_wait(&resync_wait, &wq);
8792 } while (mddev->curr_resync < 2);
8795 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8796 /* resync follows the size requested by the personality,
8797 * which defaults to physical size, but can be virtual size
8799 max_sectors = mddev->resync_max_sectors;
8800 atomic64_set(&mddev->resync_mismatches, 0);
8801 /* we don't use the checkpoint if there's a bitmap */
8802 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8803 j = mddev->resync_min;
8804 else if (!mddev->bitmap)
8805 j = mddev->recovery_cp;
8807 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8808 max_sectors = mddev->resync_max_sectors;
8810 * If the original node aborts reshaping then we continue the
8811 * reshaping, so set j again to avoid restart reshape from the
8814 if (mddev_is_clustered(mddev) &&
8815 mddev->reshape_position != MaxSector)
8816 j = mddev->reshape_position;
8818 /* recovery follows the physical size of devices */
8819 max_sectors = mddev->dev_sectors;
8822 rdev_for_each_rcu(rdev, mddev)
8823 if (rdev->raid_disk >= 0 &&
8824 !test_bit(Journal, &rdev->flags) &&
8825 !test_bit(Faulty, &rdev->flags) &&
8826 !test_bit(In_sync, &rdev->flags) &&
8827 rdev->recovery_offset < j)
8828 j = rdev->recovery_offset;
8831 /* If there is a bitmap, we need to make sure all
8832 * writes that started before we added a spare
8833 * complete before we start doing a recovery.
8834 * Otherwise the write might complete and (via
8835 * bitmap_endwrite) set a bit in the bitmap after the
8836 * recovery has checked that bit and skipped that
8839 if (mddev->bitmap) {
8840 mddev->pers->quiesce(mddev, 1);
8841 mddev->pers->quiesce(mddev, 0);
8845 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8846 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8847 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8848 speed_max(mddev), desc);
8850 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8853 for (m = 0; m < SYNC_MARKS; m++) {
8855 mark_cnt[m] = io_sectors;
8858 mddev->resync_mark = mark[last_mark];
8859 mddev->resync_mark_cnt = mark_cnt[last_mark];
8862 * Tune reconstruction:
8864 window = 32 * (PAGE_SIZE / 512);
8865 pr_debug("md: using %dk window, over a total of %lluk.\n",
8866 window/2, (unsigned long long)max_sectors/2);
8868 atomic_set(&mddev->recovery_active, 0);
8872 pr_debug("md: resuming %s of %s from checkpoint.\n",
8873 desc, mdname(mddev));
8874 mddev->curr_resync = j;
8876 mddev->curr_resync = 3; /* no longer delayed */
8877 mddev->curr_resync_completed = j;
8878 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8879 md_new_event(mddev);
8880 update_time = jiffies;
8882 blk_start_plug(&plug);
8883 while (j < max_sectors) {
8888 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8889 ((mddev->curr_resync > mddev->curr_resync_completed &&
8890 (mddev->curr_resync - mddev->curr_resync_completed)
8891 > (max_sectors >> 4)) ||
8892 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8893 (j - mddev->curr_resync_completed)*2
8894 >= mddev->resync_max - mddev->curr_resync_completed ||
8895 mddev->curr_resync_completed > mddev->resync_max
8897 /* time to update curr_resync_completed */
8898 wait_event(mddev->recovery_wait,
8899 atomic_read(&mddev->recovery_active) == 0);
8900 mddev->curr_resync_completed = j;
8901 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8902 j > mddev->recovery_cp)
8903 mddev->recovery_cp = j;
8904 update_time = jiffies;
8905 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8906 sysfs_notify_dirent_safe(mddev->sysfs_completed);
8909 while (j >= mddev->resync_max &&
8910 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8911 /* As this condition is controlled by user-space,
8912 * we can block indefinitely, so use '_interruptible'
8913 * to avoid triggering warnings.
8915 flush_signals(current); /* just in case */
8916 wait_event_interruptible(mddev->recovery_wait,
8917 mddev->resync_max > j
8918 || test_bit(MD_RECOVERY_INTR,
8922 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8925 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8927 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8931 if (!skipped) { /* actual IO requested */
8932 io_sectors += sectors;
8933 atomic_add(sectors, &mddev->recovery_active);
8936 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8940 if (j > max_sectors)
8941 /* when skipping, extra large numbers can be returned. */
8944 mddev->curr_resync = j;
8945 mddev->curr_mark_cnt = io_sectors;
8946 if (last_check == 0)
8947 /* this is the earliest that rebuild will be
8948 * visible in /proc/mdstat
8950 md_new_event(mddev);
8952 if (last_check + window > io_sectors || j == max_sectors)
8955 last_check = io_sectors;
8957 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8959 int next = (last_mark+1) % SYNC_MARKS;
8961 mddev->resync_mark = mark[next];
8962 mddev->resync_mark_cnt = mark_cnt[next];
8963 mark[next] = jiffies;
8964 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8968 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8972 * this loop exits only if either when we are slower than
8973 * the 'hard' speed limit, or the system was IO-idle for
8975 * the system might be non-idle CPU-wise, but we only care
8976 * about not overloading the IO subsystem. (things like an
8977 * e2fsck being done on the RAID array should execute fast)
8981 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8982 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8983 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8985 if (currspeed > speed_min(mddev)) {
8986 if (currspeed > speed_max(mddev)) {
8990 if (!is_mddev_idle(mddev, 0)) {
8992 * Give other IO more of a chance.
8993 * The faster the devices, the less we wait.
8995 wait_event(mddev->recovery_wait,
8996 !atomic_read(&mddev->recovery_active));
9000 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9001 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9002 ? "interrupted" : "done");
9004 * this also signals 'finished resyncing' to md_stop
9006 blk_finish_plug(&plug);
9007 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9009 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9010 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9011 mddev->curr_resync > 3) {
9012 mddev->curr_resync_completed = mddev->curr_resync;
9013 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9015 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9017 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9018 mddev->curr_resync > 3) {
9019 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9020 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9021 if (mddev->curr_resync >= mddev->recovery_cp) {
9022 pr_debug("md: checkpointing %s of %s.\n",
9023 desc, mdname(mddev));
9024 if (test_bit(MD_RECOVERY_ERROR,
9026 mddev->recovery_cp =
9027 mddev->curr_resync_completed;
9029 mddev->recovery_cp =
9033 mddev->recovery_cp = MaxSector;
9035 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9036 mddev->curr_resync = MaxSector;
9037 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9038 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9040 rdev_for_each_rcu(rdev, mddev)
9041 if (rdev->raid_disk >= 0 &&
9042 mddev->delta_disks >= 0 &&
9043 !test_bit(Journal, &rdev->flags) &&
9044 !test_bit(Faulty, &rdev->flags) &&
9045 !test_bit(In_sync, &rdev->flags) &&
9046 rdev->recovery_offset < mddev->curr_resync)
9047 rdev->recovery_offset = mddev->curr_resync;
9053 /* set CHANGE_PENDING here since maybe another update is needed,
9054 * so other nodes are informed. It should be harmless for normal
9056 set_mask_bits(&mddev->sb_flags, 0,
9057 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9059 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9060 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9061 mddev->delta_disks > 0 &&
9062 mddev->pers->finish_reshape &&
9063 mddev->pers->size &&
9065 mddev_lock_nointr(mddev);
9066 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9067 mddev_unlock(mddev);
9068 if (!mddev_is_clustered(mddev))
9069 set_capacity_and_notify(mddev->gendisk,
9070 mddev->array_sectors);
9073 spin_lock(&mddev->lock);
9074 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9075 /* We completed so min/max setting can be forgotten if used. */
9076 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9077 mddev->resync_min = 0;
9078 mddev->resync_max = MaxSector;
9079 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9080 mddev->resync_min = mddev->curr_resync_completed;
9081 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9082 mddev->curr_resync = 0;
9083 spin_unlock(&mddev->lock);
9085 wake_up(&resync_wait);
9086 md_wakeup_thread(mddev->thread);
9089 EXPORT_SYMBOL_GPL(md_do_sync);
9091 static int remove_and_add_spares(struct mddev *mddev,
9092 struct md_rdev *this)
9094 struct md_rdev *rdev;
9097 bool remove_some = false;
9099 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9100 /* Mustn't remove devices when resync thread is running */
9103 rdev_for_each(rdev, mddev) {
9104 if ((this == NULL || rdev == this) &&
9105 rdev->raid_disk >= 0 &&
9106 !test_bit(Blocked, &rdev->flags) &&
9107 test_bit(Faulty, &rdev->flags) &&
9108 atomic_read(&rdev->nr_pending)==0) {
9109 /* Faulty non-Blocked devices with nr_pending == 0
9110 * never get nr_pending incremented,
9111 * never get Faulty cleared, and never get Blocked set.
9112 * So we can synchronize_rcu now rather than once per device
9115 set_bit(RemoveSynchronized, &rdev->flags);
9121 rdev_for_each(rdev, mddev) {
9122 if ((this == NULL || rdev == this) &&
9123 rdev->raid_disk >= 0 &&
9124 !test_bit(Blocked, &rdev->flags) &&
9125 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9126 (!test_bit(In_sync, &rdev->flags) &&
9127 !test_bit(Journal, &rdev->flags))) &&
9128 atomic_read(&rdev->nr_pending)==0)) {
9129 if (mddev->pers->hot_remove_disk(
9130 mddev, rdev) == 0) {
9131 sysfs_unlink_rdev(mddev, rdev);
9132 rdev->saved_raid_disk = rdev->raid_disk;
9133 rdev->raid_disk = -1;
9137 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9138 clear_bit(RemoveSynchronized, &rdev->flags);
9141 if (removed && mddev->kobj.sd)
9142 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9144 if (this && removed)
9147 rdev_for_each(rdev, mddev) {
9148 if (this && this != rdev)
9150 if (test_bit(Candidate, &rdev->flags))
9152 if (rdev->raid_disk >= 0 &&
9153 !test_bit(In_sync, &rdev->flags) &&
9154 !test_bit(Journal, &rdev->flags) &&
9155 !test_bit(Faulty, &rdev->flags))
9157 if (rdev->raid_disk >= 0)
9159 if (test_bit(Faulty, &rdev->flags))
9161 if (!test_bit(Journal, &rdev->flags)) {
9163 ! (rdev->saved_raid_disk >= 0 &&
9164 !test_bit(Bitmap_sync, &rdev->flags)))
9167 rdev->recovery_offset = 0;
9169 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9170 /* failure here is OK */
9171 sysfs_link_rdev(mddev, rdev);
9172 if (!test_bit(Journal, &rdev->flags))
9174 md_new_event(mddev);
9175 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9180 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9184 static void md_start_sync(struct work_struct *ws)
9186 struct mddev *mddev = container_of(ws, struct mddev, del_work);
9188 mddev->sync_thread = md_register_thread(md_do_sync,
9191 if (!mddev->sync_thread) {
9192 pr_warn("%s: could not start resync thread...\n",
9194 /* leave the spares where they are, it shouldn't hurt */
9195 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9196 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9197 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9198 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9199 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9200 wake_up(&resync_wait);
9201 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9203 if (mddev->sysfs_action)
9204 sysfs_notify_dirent_safe(mddev->sysfs_action);
9206 md_wakeup_thread(mddev->sync_thread);
9207 sysfs_notify_dirent_safe(mddev->sysfs_action);
9208 md_new_event(mddev);
9212 * This routine is regularly called by all per-raid-array threads to
9213 * deal with generic issues like resync and super-block update.
9214 * Raid personalities that don't have a thread (linear/raid0) do not
9215 * need this as they never do any recovery or update the superblock.
9217 * It does not do any resync itself, but rather "forks" off other threads
9218 * to do that as needed.
9219 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9220 * "->recovery" and create a thread at ->sync_thread.
9221 * When the thread finishes it sets MD_RECOVERY_DONE
9222 * and wakeups up this thread which will reap the thread and finish up.
9223 * This thread also removes any faulty devices (with nr_pending == 0).
9225 * The overall approach is:
9226 * 1/ if the superblock needs updating, update it.
9227 * 2/ If a recovery thread is running, don't do anything else.
9228 * 3/ If recovery has finished, clean up, possibly marking spares active.
9229 * 4/ If there are any faulty devices, remove them.
9230 * 5/ If array is degraded, try to add spares devices
9231 * 6/ If array has spares or is not in-sync, start a resync thread.
9233 void md_check_recovery(struct mddev *mddev)
9235 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9236 /* Write superblock - thread that called mddev_suspend()
9237 * holds reconfig_mutex for us.
9239 set_bit(MD_UPDATING_SB, &mddev->flags);
9240 smp_mb__after_atomic();
9241 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9242 md_update_sb(mddev, 0);
9243 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9244 wake_up(&mddev->sb_wait);
9247 if (mddev->suspended)
9251 md_bitmap_daemon_work(mddev);
9253 if (signal_pending(current)) {
9254 if (mddev->pers->sync_request && !mddev->external) {
9255 pr_debug("md: %s in immediate safe mode\n",
9257 mddev->safemode = 2;
9259 flush_signals(current);
9262 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9265 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9266 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9267 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9268 (mddev->external == 0 && mddev->safemode == 1) ||
9269 (mddev->safemode == 2
9270 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9274 if (mddev_trylock(mddev)) {
9276 bool try_set_sync = mddev->safemode != 0;
9278 if (!mddev->external && mddev->safemode == 1)
9279 mddev->safemode = 0;
9282 struct md_rdev *rdev;
9283 if (!mddev->external && mddev->in_sync)
9284 /* 'Blocked' flag not needed as failed devices
9285 * will be recorded if array switched to read/write.
9286 * Leaving it set will prevent the device
9287 * from being removed.
9289 rdev_for_each(rdev, mddev)
9290 clear_bit(Blocked, &rdev->flags);
9291 /* On a read-only array we can:
9292 * - remove failed devices
9293 * - add already-in_sync devices if the array itself
9295 * As we only add devices that are already in-sync,
9296 * we can activate the spares immediately.
9298 remove_and_add_spares(mddev, NULL);
9299 /* There is no thread, but we need to call
9300 * ->spare_active and clear saved_raid_disk
9302 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9303 md_reap_sync_thread(mddev);
9304 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9305 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9306 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9310 if (mddev_is_clustered(mddev)) {
9311 struct md_rdev *rdev, *tmp;
9312 /* kick the device if another node issued a
9315 rdev_for_each_safe(rdev, tmp, mddev) {
9316 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9317 rdev->raid_disk < 0)
9318 md_kick_rdev_from_array(rdev);
9322 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9323 spin_lock(&mddev->lock);
9325 spin_unlock(&mddev->lock);
9328 if (mddev->sb_flags)
9329 md_update_sb(mddev, 0);
9331 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9332 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9333 /* resync/recovery still happening */
9334 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9337 if (mddev->sync_thread) {
9338 md_reap_sync_thread(mddev);
9341 /* Set RUNNING before clearing NEEDED to avoid
9342 * any transients in the value of "sync_action".
9344 mddev->curr_resync_completed = 0;
9345 spin_lock(&mddev->lock);
9346 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9347 spin_unlock(&mddev->lock);
9348 /* Clear some bits that don't mean anything, but
9351 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9352 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9354 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9355 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9357 /* no recovery is running.
9358 * remove any failed drives, then
9359 * add spares if possible.
9360 * Spares are also removed and re-added, to allow
9361 * the personality to fail the re-add.
9364 if (mddev->reshape_position != MaxSector) {
9365 if (mddev->pers->check_reshape == NULL ||
9366 mddev->pers->check_reshape(mddev) != 0)
9367 /* Cannot proceed */
9369 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9370 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9371 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9372 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9373 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9374 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9375 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9376 } else if (mddev->recovery_cp < MaxSector) {
9377 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9378 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9379 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9380 /* nothing to be done ... */
9383 if (mddev->pers->sync_request) {
9385 /* We are adding a device or devices to an array
9386 * which has the bitmap stored on all devices.
9387 * So make sure all bitmap pages get written
9389 md_bitmap_write_all(mddev->bitmap);
9391 INIT_WORK(&mddev->del_work, md_start_sync);
9392 queue_work(md_misc_wq, &mddev->del_work);
9396 if (!mddev->sync_thread) {
9397 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9398 wake_up(&resync_wait);
9399 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9401 if (mddev->sysfs_action)
9402 sysfs_notify_dirent_safe(mddev->sysfs_action);
9405 wake_up(&mddev->sb_wait);
9406 mddev_unlock(mddev);
9409 EXPORT_SYMBOL(md_check_recovery);
9411 void md_reap_sync_thread(struct mddev *mddev)
9413 struct md_rdev *rdev;
9414 sector_t old_dev_sectors = mddev->dev_sectors;
9415 bool is_reshaped = false;
9417 /* resync has finished, collect result */
9418 md_unregister_thread(&mddev->sync_thread);
9419 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9420 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9421 mddev->degraded != mddev->raid_disks) {
9423 /* activate any spares */
9424 if (mddev->pers->spare_active(mddev)) {
9425 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9426 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9429 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9430 mddev->pers->finish_reshape) {
9431 mddev->pers->finish_reshape(mddev);
9432 if (mddev_is_clustered(mddev))
9436 /* If array is no-longer degraded, then any saved_raid_disk
9437 * information must be scrapped.
9439 if (!mddev->degraded)
9440 rdev_for_each(rdev, mddev)
9441 rdev->saved_raid_disk = -1;
9443 md_update_sb(mddev, 1);
9444 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9445 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9447 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9448 md_cluster_ops->resync_finish(mddev);
9449 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9450 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9451 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9452 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9453 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9454 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9456 * We call md_cluster_ops->update_size here because sync_size could
9457 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9458 * so it is time to update size across cluster.
9460 if (mddev_is_clustered(mddev) && is_reshaped
9461 && !test_bit(MD_CLOSING, &mddev->flags))
9462 md_cluster_ops->update_size(mddev, old_dev_sectors);
9463 wake_up(&resync_wait);
9464 /* flag recovery needed just to double check */
9465 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9466 sysfs_notify_dirent_safe(mddev->sysfs_action);
9467 md_new_event(mddev);
9468 if (mddev->event_work.func)
9469 queue_work(md_misc_wq, &mddev->event_work);
9471 EXPORT_SYMBOL(md_reap_sync_thread);
9473 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9475 sysfs_notify_dirent_safe(rdev->sysfs_state);
9476 wait_event_timeout(rdev->blocked_wait,
9477 !test_bit(Blocked, &rdev->flags) &&
9478 !test_bit(BlockedBadBlocks, &rdev->flags),
9479 msecs_to_jiffies(5000));
9480 rdev_dec_pending(rdev, mddev);
9482 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9484 void md_finish_reshape(struct mddev *mddev)
9486 /* called be personality module when reshape completes. */
9487 struct md_rdev *rdev;
9489 rdev_for_each(rdev, mddev) {
9490 if (rdev->data_offset > rdev->new_data_offset)
9491 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9493 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9494 rdev->data_offset = rdev->new_data_offset;
9497 EXPORT_SYMBOL(md_finish_reshape);
9499 /* Bad block management */
9501 /* Returns 1 on success, 0 on failure */
9502 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9505 struct mddev *mddev = rdev->mddev;
9508 s += rdev->new_data_offset;
9510 s += rdev->data_offset;
9511 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9513 /* Make sure they get written out promptly */
9514 if (test_bit(ExternalBbl, &rdev->flags))
9515 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9516 sysfs_notify_dirent_safe(rdev->sysfs_state);
9517 set_mask_bits(&mddev->sb_flags, 0,
9518 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9519 md_wakeup_thread(rdev->mddev->thread);
9524 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9526 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9531 s += rdev->new_data_offset;
9533 s += rdev->data_offset;
9534 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9535 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9536 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9539 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9541 static int md_notify_reboot(struct notifier_block *this,
9542 unsigned long code, void *x)
9544 struct list_head *tmp;
9545 struct mddev *mddev;
9548 for_each_mddev(mddev, tmp) {
9549 if (mddev_trylock(mddev)) {
9551 __md_stop_writes(mddev);
9552 if (mddev->persistent)
9553 mddev->safemode = 2;
9554 mddev_unlock(mddev);
9559 * certain more exotic SCSI devices are known to be
9560 * volatile wrt too early system reboots. While the
9561 * right place to handle this issue is the given
9562 * driver, we do want to have a safe RAID driver ...
9570 static struct notifier_block md_notifier = {
9571 .notifier_call = md_notify_reboot,
9573 .priority = INT_MAX, /* before any real devices */
9576 static void md_geninit(void)
9578 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9580 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9583 static int __init md_init(void)
9587 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9591 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9595 md_rdev_misc_wq = alloc_workqueue("md_rdev_misc", 0, 0);
9596 if (!md_rdev_misc_wq)
9597 goto err_rdev_misc_wq;
9599 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9603 ret = __register_blkdev(0, "mdp", md_probe);
9608 register_reboot_notifier(&md_notifier);
9609 raid_table_header = register_sysctl_table(raid_root_table);
9615 unregister_blkdev(MD_MAJOR, "md");
9617 destroy_workqueue(md_rdev_misc_wq);
9619 destroy_workqueue(md_misc_wq);
9621 destroy_workqueue(md_wq);
9626 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9628 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9629 struct md_rdev *rdev2, *tmp;
9631 char b[BDEVNAME_SIZE];
9634 * If size is changed in another node then we need to
9635 * do resize as well.
9637 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9638 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9640 pr_info("md-cluster: resize failed\n");
9642 md_bitmap_update_sb(mddev->bitmap);
9645 /* Check for change of roles in the active devices */
9646 rdev_for_each_safe(rdev2, tmp, mddev) {
9647 if (test_bit(Faulty, &rdev2->flags))
9650 /* Check if the roles changed */
9651 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9653 if (test_bit(Candidate, &rdev2->flags)) {
9654 if (role == 0xfffe) {
9655 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9656 md_kick_rdev_from_array(rdev2);
9660 clear_bit(Candidate, &rdev2->flags);
9663 if (role != rdev2->raid_disk) {
9665 * got activated except reshape is happening.
9667 if (rdev2->raid_disk == -1 && role != 0xffff &&
9668 !(le32_to_cpu(sb->feature_map) &
9669 MD_FEATURE_RESHAPE_ACTIVE)) {
9670 rdev2->saved_raid_disk = role;
9671 ret = remove_and_add_spares(mddev, rdev2);
9672 pr_info("Activated spare: %s\n",
9673 bdevname(rdev2->bdev,b));
9674 /* wakeup mddev->thread here, so array could
9675 * perform resync with the new activated disk */
9676 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9677 md_wakeup_thread(mddev->thread);
9680 * We just want to do the minimum to mark the disk
9681 * as faulty. The recovery is performed by the
9682 * one who initiated the error.
9684 if ((role == 0xfffe) || (role == 0xfffd)) {
9685 md_error(mddev, rdev2);
9686 clear_bit(Blocked, &rdev2->flags);
9691 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9692 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9694 pr_warn("md: updating array disks failed. %d\n", ret);
9698 * Since mddev->delta_disks has already updated in update_raid_disks,
9699 * so it is time to check reshape.
9701 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9702 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9704 * reshape is happening in the remote node, we need to
9705 * update reshape_position and call start_reshape.
9707 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9708 if (mddev->pers->update_reshape_pos)
9709 mddev->pers->update_reshape_pos(mddev);
9710 if (mddev->pers->start_reshape)
9711 mddev->pers->start_reshape(mddev);
9712 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9713 mddev->reshape_position != MaxSector &&
9714 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9715 /* reshape is just done in another node. */
9716 mddev->reshape_position = MaxSector;
9717 if (mddev->pers->update_reshape_pos)
9718 mddev->pers->update_reshape_pos(mddev);
9721 /* Finally set the event to be up to date */
9722 mddev->events = le64_to_cpu(sb->events);
9725 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9728 struct page *swapout = rdev->sb_page;
9729 struct mdp_superblock_1 *sb;
9731 /* Store the sb page of the rdev in the swapout temporary
9732 * variable in case we err in the future
9734 rdev->sb_page = NULL;
9735 err = alloc_disk_sb(rdev);
9737 ClearPageUptodate(rdev->sb_page);
9738 rdev->sb_loaded = 0;
9739 err = super_types[mddev->major_version].
9740 load_super(rdev, NULL, mddev->minor_version);
9743 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9744 __func__, __LINE__, rdev->desc_nr, err);
9746 put_page(rdev->sb_page);
9747 rdev->sb_page = swapout;
9748 rdev->sb_loaded = 1;
9752 sb = page_address(rdev->sb_page);
9753 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9757 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9758 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9760 /* The other node finished recovery, call spare_active to set
9761 * device In_sync and mddev->degraded
9763 if (rdev->recovery_offset == MaxSector &&
9764 !test_bit(In_sync, &rdev->flags) &&
9765 mddev->pers->spare_active(mddev))
9766 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9772 void md_reload_sb(struct mddev *mddev, int nr)
9774 struct md_rdev *rdev;
9778 rdev_for_each_rcu(rdev, mddev) {
9779 if (rdev->desc_nr == nr)
9783 if (!rdev || rdev->desc_nr != nr) {
9784 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9788 err = read_rdev(mddev, rdev);
9792 check_sb_changes(mddev, rdev);
9794 /* Read all rdev's to update recovery_offset */
9795 rdev_for_each_rcu(rdev, mddev) {
9796 if (!test_bit(Faulty, &rdev->flags))
9797 read_rdev(mddev, rdev);
9800 EXPORT_SYMBOL(md_reload_sb);
9805 * Searches all registered partitions for autorun RAID arrays
9809 static DEFINE_MUTEX(detected_devices_mutex);
9810 static LIST_HEAD(all_detected_devices);
9811 struct detected_devices_node {
9812 struct list_head list;
9816 void md_autodetect_dev(dev_t dev)
9818 struct detected_devices_node *node_detected_dev;
9820 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9821 if (node_detected_dev) {
9822 node_detected_dev->dev = dev;
9823 mutex_lock(&detected_devices_mutex);
9824 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9825 mutex_unlock(&detected_devices_mutex);
9829 void md_autostart_arrays(int part)
9831 struct md_rdev *rdev;
9832 struct detected_devices_node *node_detected_dev;
9834 int i_scanned, i_passed;
9839 pr_info("md: Autodetecting RAID arrays.\n");
9841 mutex_lock(&detected_devices_mutex);
9842 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9844 node_detected_dev = list_entry(all_detected_devices.next,
9845 struct detected_devices_node, list);
9846 list_del(&node_detected_dev->list);
9847 dev = node_detected_dev->dev;
9848 kfree(node_detected_dev);
9849 mutex_unlock(&detected_devices_mutex);
9850 rdev = md_import_device(dev,0, 90);
9851 mutex_lock(&detected_devices_mutex);
9855 if (test_bit(Faulty, &rdev->flags))
9858 set_bit(AutoDetected, &rdev->flags);
9859 list_add(&rdev->same_set, &pending_raid_disks);
9862 mutex_unlock(&detected_devices_mutex);
9864 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9866 autorun_devices(part);
9869 #endif /* !MODULE */
9871 static __exit void md_exit(void)
9873 struct mddev *mddev;
9874 struct list_head *tmp;
9877 unregister_blkdev(MD_MAJOR,"md");
9878 unregister_blkdev(mdp_major, "mdp");
9879 unregister_reboot_notifier(&md_notifier);
9880 unregister_sysctl_table(raid_table_header);
9882 /* We cannot unload the modules while some process is
9883 * waiting for us in select() or poll() - wake them up
9886 while (waitqueue_active(&md_event_waiters)) {
9887 /* not safe to leave yet */
9888 wake_up(&md_event_waiters);
9892 remove_proc_entry("mdstat", NULL);
9894 for_each_mddev(mddev, tmp) {
9895 export_array(mddev);
9897 mddev->hold_active = 0;
9899 * for_each_mddev() will call mddev_put() at the end of each
9900 * iteration. As the mddev is now fully clear, this will
9901 * schedule the mddev for destruction by a workqueue, and the
9902 * destroy_workqueue() below will wait for that to complete.
9905 destroy_workqueue(md_rdev_misc_wq);
9906 destroy_workqueue(md_misc_wq);
9907 destroy_workqueue(md_wq);
9910 subsys_initcall(md_init);
9911 module_exit(md_exit)
9913 static int get_ro(char *buffer, const struct kernel_param *kp)
9915 return sprintf(buffer, "%d\n", start_readonly);
9917 static int set_ro(const char *val, const struct kernel_param *kp)
9919 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9922 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9923 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9924 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9925 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9927 MODULE_LICENSE("GPL");
9928 MODULE_DESCRIPTION("MD RAID framework");
9930 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);