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/slab.h>
62 #include <linux/percpu-refcount.h>
64 #include <trace/events/block.h>
66 #include "md-bitmap.h"
67 #include "md-cluster.h"
70 static void autostart_arrays(int part);
73 /* pers_list is a list of registered personalities protected
75 * pers_lock does extra service to protect accesses to
76 * mddev->thread when the mutex cannot be held.
78 static LIST_HEAD(pers_list);
79 static DEFINE_SPINLOCK(pers_lock);
81 static struct kobj_type md_ktype;
83 struct md_cluster_operations *md_cluster_ops;
84 EXPORT_SYMBOL(md_cluster_ops);
85 static struct module *md_cluster_mod;
87 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
88 static struct workqueue_struct *md_wq;
89 static struct workqueue_struct *md_misc_wq;
91 static int remove_and_add_spares(struct mddev *mddev,
92 struct md_rdev *this);
93 static void mddev_detach(struct mddev *mddev);
96 * Default number of read corrections we'll attempt on an rdev
97 * before ejecting it from the array. We divide the read error
98 * count by 2 for every hour elapsed between read errors.
100 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
102 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
103 * is 1000 KB/sec, so the extra system load does not show up that much.
104 * Increase it if you want to have more _guaranteed_ speed. Note that
105 * the RAID driver will use the maximum available bandwidth if the IO
106 * subsystem is idle. There is also an 'absolute maximum' reconstruction
107 * speed limit - in case reconstruction slows down your system despite
110 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
111 * or /sys/block/mdX/md/sync_speed_{min,max}
114 static int sysctl_speed_limit_min = 1000;
115 static int sysctl_speed_limit_max = 200000;
116 static inline int speed_min(struct mddev *mddev)
118 return mddev->sync_speed_min ?
119 mddev->sync_speed_min : sysctl_speed_limit_min;
122 static inline int speed_max(struct mddev *mddev)
124 return mddev->sync_speed_max ?
125 mddev->sync_speed_max : sysctl_speed_limit_max;
128 static int rdev_init_wb(struct md_rdev *rdev)
130 if (rdev->bdev->bd_queue->nr_hw_queues == 1)
133 spin_lock_init(&rdev->wb_list_lock);
134 INIT_LIST_HEAD(&rdev->wb_list);
135 init_waitqueue_head(&rdev->wb_io_wait);
136 set_bit(WBCollisionCheck, &rdev->flags);
142 * Create wb_info_pool if rdev is the first multi-queue device flaged
143 * with writemostly, also write-behind mode is enabled.
145 void mddev_create_wb_pool(struct mddev *mddev, struct md_rdev *rdev,
148 if (mddev->bitmap_info.max_write_behind == 0)
151 if (!test_bit(WriteMostly, &rdev->flags) || !rdev_init_wb(rdev))
154 if (mddev->wb_info_pool == NULL) {
155 unsigned int noio_flag;
158 mddev_suspend(mddev);
159 noio_flag = memalloc_noio_save();
160 mddev->wb_info_pool = mempool_create_kmalloc_pool(NR_WB_INFOS,
161 sizeof(struct wb_info));
162 memalloc_noio_restore(noio_flag);
163 if (!mddev->wb_info_pool)
164 pr_err("can't alloc memory pool for writemostly\n");
169 EXPORT_SYMBOL_GPL(mddev_create_wb_pool);
172 * destroy wb_info_pool if rdev is the last device flaged with WBCollisionCheck.
174 static void mddev_destroy_wb_pool(struct mddev *mddev, struct md_rdev *rdev)
176 if (!test_and_clear_bit(WBCollisionCheck, &rdev->flags))
179 if (mddev->wb_info_pool) {
180 struct md_rdev *temp;
184 * Check if other rdevs need wb_info_pool.
186 rdev_for_each(temp, mddev)
188 test_bit(WBCollisionCheck, &temp->flags))
191 mddev_suspend(rdev->mddev);
192 mempool_destroy(mddev->wb_info_pool);
193 mddev->wb_info_pool = NULL;
194 mddev_resume(rdev->mddev);
199 static struct ctl_table_header *raid_table_header;
201 static struct ctl_table raid_table[] = {
203 .procname = "speed_limit_min",
204 .data = &sysctl_speed_limit_min,
205 .maxlen = sizeof(int),
206 .mode = S_IRUGO|S_IWUSR,
207 .proc_handler = proc_dointvec,
210 .procname = "speed_limit_max",
211 .data = &sysctl_speed_limit_max,
212 .maxlen = sizeof(int),
213 .mode = S_IRUGO|S_IWUSR,
214 .proc_handler = proc_dointvec,
219 static struct ctl_table raid_dir_table[] = {
223 .mode = S_IRUGO|S_IXUGO,
229 static struct ctl_table raid_root_table[] = {
234 .child = raid_dir_table,
239 static const struct block_device_operations md_fops;
241 static int start_readonly;
244 * The original mechanism for creating an md device is to create
245 * a device node in /dev and to open it. This causes races with device-close.
246 * The preferred method is to write to the "new_array" module parameter.
247 * This can avoid races.
248 * Setting create_on_open to false disables the original mechanism
249 * so all the races disappear.
251 static bool create_on_open = true;
253 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
256 if (!mddev || !bioset_initialized(&mddev->bio_set))
257 return bio_alloc(gfp_mask, nr_iovecs);
259 return bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set);
261 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
263 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
265 if (!mddev || !bioset_initialized(&mddev->sync_set))
266 return bio_alloc(GFP_NOIO, 1);
268 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
272 * We have a system wide 'event count' that is incremented
273 * on any 'interesting' event, and readers of /proc/mdstat
274 * can use 'poll' or 'select' to find out when the event
278 * start array, stop array, error, add device, remove device,
279 * start build, activate spare
281 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
282 static atomic_t md_event_count;
283 void md_new_event(struct mddev *mddev)
285 atomic_inc(&md_event_count);
286 wake_up(&md_event_waiters);
288 EXPORT_SYMBOL_GPL(md_new_event);
291 * Enables to iterate over all existing md arrays
292 * all_mddevs_lock protects this list.
294 static LIST_HEAD(all_mddevs);
295 static DEFINE_SPINLOCK(all_mddevs_lock);
298 * iterates through all used mddevs in the system.
299 * We take care to grab the all_mddevs_lock whenever navigating
300 * the list, and to always hold a refcount when unlocked.
301 * Any code which breaks out of this loop while own
302 * a reference to the current mddev and must mddev_put it.
304 #define for_each_mddev(_mddev,_tmp) \
306 for (({ spin_lock(&all_mddevs_lock); \
307 _tmp = all_mddevs.next; \
309 ({ if (_tmp != &all_mddevs) \
310 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
311 spin_unlock(&all_mddevs_lock); \
312 if (_mddev) mddev_put(_mddev); \
313 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
314 _tmp != &all_mddevs;}); \
315 ({ spin_lock(&all_mddevs_lock); \
316 _tmp = _tmp->next;}) \
319 /* Rather than calling directly into the personality make_request function,
320 * IO requests come here first so that we can check if the device is
321 * being suspended pending a reconfiguration.
322 * We hold a refcount over the call to ->make_request. By the time that
323 * call has finished, the bio has been linked into some internal structure
324 * and so is visible to ->quiesce(), so we don't need the refcount any more.
326 static bool is_suspended(struct mddev *mddev, struct bio *bio)
328 if (mddev->suspended)
330 if (bio_data_dir(bio) != WRITE)
332 if (mddev->suspend_lo >= mddev->suspend_hi)
334 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
336 if (bio_end_sector(bio) < mddev->suspend_lo)
341 void md_handle_request(struct mddev *mddev, struct bio *bio)
345 if (is_suspended(mddev, bio)) {
348 prepare_to_wait(&mddev->sb_wait, &__wait,
349 TASK_UNINTERRUPTIBLE);
350 if (!is_suspended(mddev, bio))
356 finish_wait(&mddev->sb_wait, &__wait);
358 atomic_inc(&mddev->active_io);
361 if (!mddev->pers->make_request(mddev, bio)) {
362 atomic_dec(&mddev->active_io);
363 wake_up(&mddev->sb_wait);
364 goto check_suspended;
367 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
368 wake_up(&mddev->sb_wait);
370 EXPORT_SYMBOL(md_handle_request);
372 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
374 const int rw = bio_data_dir(bio);
375 const int sgrp = op_stat_group(bio_op(bio));
376 struct mddev *mddev = q->queuedata;
377 unsigned int sectors;
379 blk_queue_split(q, &bio);
381 if (mddev == NULL || mddev->pers == NULL) {
383 return BLK_QC_T_NONE;
385 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
386 if (bio_sectors(bio) != 0)
387 bio->bi_status = BLK_STS_IOERR;
389 return BLK_QC_T_NONE;
393 * save the sectors now since our bio can
394 * go away inside make_request
396 sectors = bio_sectors(bio);
397 /* bio could be mergeable after passing to underlayer */
398 bio->bi_opf &= ~REQ_NOMERGE;
400 md_handle_request(mddev, bio);
403 part_stat_inc(&mddev->gendisk->part0, ios[sgrp]);
404 part_stat_add(&mddev->gendisk->part0, sectors[sgrp], sectors);
407 return BLK_QC_T_NONE;
410 /* mddev_suspend makes sure no new requests are submitted
411 * to the device, and that any requests that have been submitted
412 * are completely handled.
413 * Once mddev_detach() is called and completes, the module will be
416 void mddev_suspend(struct mddev *mddev)
418 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
419 lockdep_assert_held(&mddev->reconfig_mutex);
420 if (mddev->suspended++)
423 wake_up(&mddev->sb_wait);
424 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
425 smp_mb__after_atomic();
426 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
427 mddev->pers->quiesce(mddev, 1);
428 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
429 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
431 del_timer_sync(&mddev->safemode_timer);
433 EXPORT_SYMBOL_GPL(mddev_suspend);
435 void mddev_resume(struct mddev *mddev)
437 lockdep_assert_held(&mddev->reconfig_mutex);
438 if (--mddev->suspended)
440 wake_up(&mddev->sb_wait);
441 mddev->pers->quiesce(mddev, 0);
443 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
444 md_wakeup_thread(mddev->thread);
445 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
447 EXPORT_SYMBOL_GPL(mddev_resume);
449 int mddev_congested(struct mddev *mddev, int bits)
451 struct md_personality *pers = mddev->pers;
455 if (mddev->suspended)
457 else if (pers && pers->congested)
458 ret = pers->congested(mddev, bits);
462 EXPORT_SYMBOL_GPL(mddev_congested);
463 static int md_congested(void *data, int bits)
465 struct mddev *mddev = data;
466 return mddev_congested(mddev, bits);
470 * Generic flush handling for md
473 static void md_end_flush(struct bio *bio)
475 struct md_rdev *rdev = bio->bi_private;
476 struct mddev *mddev = rdev->mddev;
478 rdev_dec_pending(rdev, mddev);
480 if (atomic_dec_and_test(&mddev->flush_pending)) {
481 /* The pre-request flush has finished */
482 queue_work(md_wq, &mddev->flush_work);
487 static void md_submit_flush_data(struct work_struct *ws);
489 static void submit_flushes(struct work_struct *ws)
491 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
492 struct md_rdev *rdev;
494 mddev->start_flush = ktime_get_boottime();
495 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
496 atomic_set(&mddev->flush_pending, 1);
498 rdev_for_each_rcu(rdev, mddev)
499 if (rdev->raid_disk >= 0 &&
500 !test_bit(Faulty, &rdev->flags)) {
501 /* Take two references, one is dropped
502 * when request finishes, one after
503 * we reclaim rcu_read_lock
506 atomic_inc(&rdev->nr_pending);
507 atomic_inc(&rdev->nr_pending);
509 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
510 bi->bi_end_io = md_end_flush;
511 bi->bi_private = rdev;
512 bio_set_dev(bi, rdev->bdev);
513 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
514 atomic_inc(&mddev->flush_pending);
517 rdev_dec_pending(rdev, mddev);
520 if (atomic_dec_and_test(&mddev->flush_pending))
521 queue_work(md_wq, &mddev->flush_work);
524 static void md_submit_flush_data(struct work_struct *ws)
526 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
527 struct bio *bio = mddev->flush_bio;
530 * must reset flush_bio before calling into md_handle_request to avoid a
531 * deadlock, because other bios passed md_handle_request suspend check
532 * could wait for this and below md_handle_request could wait for those
533 * bios because of suspend check
535 mddev->last_flush = mddev->start_flush;
536 mddev->flush_bio = NULL;
537 wake_up(&mddev->sb_wait);
539 if (bio->bi_iter.bi_size == 0) {
540 /* an empty barrier - all done */
543 bio->bi_opf &= ~REQ_PREFLUSH;
544 md_handle_request(mddev, bio);
548 void md_flush_request(struct mddev *mddev, struct bio *bio)
550 ktime_t start = ktime_get_boottime();
551 spin_lock_irq(&mddev->lock);
552 wait_event_lock_irq(mddev->sb_wait,
554 ktime_after(mddev->last_flush, start),
556 if (!ktime_after(mddev->last_flush, start)) {
557 WARN_ON(mddev->flush_bio);
558 mddev->flush_bio = bio;
561 spin_unlock_irq(&mddev->lock);
564 INIT_WORK(&mddev->flush_work, submit_flushes);
565 queue_work(md_wq, &mddev->flush_work);
567 /* flush was performed for some other bio while we waited. */
568 if (bio->bi_iter.bi_size == 0)
569 /* an empty barrier - all done */
572 bio->bi_opf &= ~REQ_PREFLUSH;
573 mddev->pers->make_request(mddev, bio);
577 EXPORT_SYMBOL(md_flush_request);
579 static inline struct mddev *mddev_get(struct mddev *mddev)
581 atomic_inc(&mddev->active);
585 static void mddev_delayed_delete(struct work_struct *ws);
587 static void mddev_put(struct mddev *mddev)
589 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
591 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
592 mddev->ctime == 0 && !mddev->hold_active) {
593 /* Array is not configured at all, and not held active,
595 list_del_init(&mddev->all_mddevs);
598 * Call queue_work inside the spinlock so that
599 * flush_workqueue() after mddev_find will succeed in waiting
600 * for the work to be done.
602 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
603 queue_work(md_misc_wq, &mddev->del_work);
605 spin_unlock(&all_mddevs_lock);
608 static void md_safemode_timeout(struct timer_list *t);
610 void mddev_init(struct mddev *mddev)
612 kobject_init(&mddev->kobj, &md_ktype);
613 mutex_init(&mddev->open_mutex);
614 mutex_init(&mddev->reconfig_mutex);
615 mutex_init(&mddev->bitmap_info.mutex);
616 INIT_LIST_HEAD(&mddev->disks);
617 INIT_LIST_HEAD(&mddev->all_mddevs);
618 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
619 atomic_set(&mddev->active, 1);
620 atomic_set(&mddev->openers, 0);
621 atomic_set(&mddev->active_io, 0);
622 spin_lock_init(&mddev->lock);
623 atomic_set(&mddev->flush_pending, 0);
624 init_waitqueue_head(&mddev->sb_wait);
625 init_waitqueue_head(&mddev->recovery_wait);
626 mddev->reshape_position = MaxSector;
627 mddev->reshape_backwards = 0;
628 mddev->last_sync_action = "none";
629 mddev->resync_min = 0;
630 mddev->resync_max = MaxSector;
631 mddev->level = LEVEL_NONE;
633 EXPORT_SYMBOL_GPL(mddev_init);
635 static struct mddev *mddev_find(dev_t unit)
637 struct mddev *mddev, *new = NULL;
639 if (unit && MAJOR(unit) != MD_MAJOR)
640 unit &= ~((1<<MdpMinorShift)-1);
643 spin_lock(&all_mddevs_lock);
646 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
647 if (mddev->unit == unit) {
649 spin_unlock(&all_mddevs_lock);
655 list_add(&new->all_mddevs, &all_mddevs);
656 spin_unlock(&all_mddevs_lock);
657 new->hold_active = UNTIL_IOCTL;
661 /* find an unused unit number */
662 static int next_minor = 512;
663 int start = next_minor;
667 dev = MKDEV(MD_MAJOR, next_minor);
669 if (next_minor > MINORMASK)
671 if (next_minor == start) {
672 /* Oh dear, all in use. */
673 spin_unlock(&all_mddevs_lock);
679 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
680 if (mddev->unit == dev) {
686 new->md_minor = MINOR(dev);
687 new->hold_active = UNTIL_STOP;
688 list_add(&new->all_mddevs, &all_mddevs);
689 spin_unlock(&all_mddevs_lock);
692 spin_unlock(&all_mddevs_lock);
694 new = kzalloc(sizeof(*new), GFP_KERNEL);
699 if (MAJOR(unit) == MD_MAJOR)
700 new->md_minor = MINOR(unit);
702 new->md_minor = MINOR(unit) >> MdpMinorShift;
709 static struct attribute_group md_redundancy_group;
711 void mddev_unlock(struct mddev *mddev)
713 if (mddev->to_remove) {
714 /* These cannot be removed under reconfig_mutex as
715 * an access to the files will try to take reconfig_mutex
716 * while holding the file unremovable, which leads to
718 * So hold set sysfs_active while the remove in happeing,
719 * and anything else which might set ->to_remove or my
720 * otherwise change the sysfs namespace will fail with
721 * -EBUSY if sysfs_active is still set.
722 * We set sysfs_active under reconfig_mutex and elsewhere
723 * test it under the same mutex to ensure its correct value
726 struct attribute_group *to_remove = mddev->to_remove;
727 mddev->to_remove = NULL;
728 mddev->sysfs_active = 1;
729 mutex_unlock(&mddev->reconfig_mutex);
731 if (mddev->kobj.sd) {
732 if (to_remove != &md_redundancy_group)
733 sysfs_remove_group(&mddev->kobj, to_remove);
734 if (mddev->pers == NULL ||
735 mddev->pers->sync_request == NULL) {
736 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
737 if (mddev->sysfs_action)
738 sysfs_put(mddev->sysfs_action);
739 mddev->sysfs_action = NULL;
742 mddev->sysfs_active = 0;
744 mutex_unlock(&mddev->reconfig_mutex);
746 /* As we've dropped the mutex we need a spinlock to
747 * make sure the thread doesn't disappear
749 spin_lock(&pers_lock);
750 md_wakeup_thread(mddev->thread);
751 wake_up(&mddev->sb_wait);
752 spin_unlock(&pers_lock);
754 EXPORT_SYMBOL_GPL(mddev_unlock);
756 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
758 struct md_rdev *rdev;
760 rdev_for_each_rcu(rdev, mddev)
761 if (rdev->desc_nr == nr)
766 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
768 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
770 struct md_rdev *rdev;
772 rdev_for_each(rdev, mddev)
773 if (rdev->bdev->bd_dev == dev)
779 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
781 struct md_rdev *rdev;
783 rdev_for_each_rcu(rdev, mddev)
784 if (rdev->bdev->bd_dev == dev)
789 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
791 static struct md_personality *find_pers(int level, char *clevel)
793 struct md_personality *pers;
794 list_for_each_entry(pers, &pers_list, list) {
795 if (level != LEVEL_NONE && pers->level == level)
797 if (strcmp(pers->name, clevel)==0)
803 /* return the offset of the super block in 512byte sectors */
804 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
806 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
807 return MD_NEW_SIZE_SECTORS(num_sectors);
810 static int alloc_disk_sb(struct md_rdev *rdev)
812 rdev->sb_page = alloc_page(GFP_KERNEL);
818 void md_rdev_clear(struct md_rdev *rdev)
821 put_page(rdev->sb_page);
823 rdev->sb_page = NULL;
828 put_page(rdev->bb_page);
829 rdev->bb_page = NULL;
831 badblocks_exit(&rdev->badblocks);
833 EXPORT_SYMBOL_GPL(md_rdev_clear);
835 static void super_written(struct bio *bio)
837 struct md_rdev *rdev = bio->bi_private;
838 struct mddev *mddev = rdev->mddev;
840 if (bio->bi_status) {
841 pr_err("md: super_written gets error=%d\n", bio->bi_status);
842 md_error(mddev, rdev);
843 if (!test_bit(Faulty, &rdev->flags)
844 && (bio->bi_opf & MD_FAILFAST)) {
845 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
846 set_bit(LastDev, &rdev->flags);
849 clear_bit(LastDev, &rdev->flags);
851 if (atomic_dec_and_test(&mddev->pending_writes))
852 wake_up(&mddev->sb_wait);
853 rdev_dec_pending(rdev, mddev);
857 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
858 sector_t sector, int size, struct page *page)
860 /* write first size bytes of page to sector of rdev
861 * Increment mddev->pending_writes before returning
862 * and decrement it on completion, waking up sb_wait
863 * if zero is reached.
864 * If an error occurred, call md_error
872 if (test_bit(Faulty, &rdev->flags))
875 bio = md_bio_alloc_sync(mddev);
877 atomic_inc(&rdev->nr_pending);
879 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
880 bio->bi_iter.bi_sector = sector;
881 bio_add_page(bio, page, size, 0);
882 bio->bi_private = rdev;
883 bio->bi_end_io = super_written;
885 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
886 test_bit(FailFast, &rdev->flags) &&
887 !test_bit(LastDev, &rdev->flags))
889 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
891 atomic_inc(&mddev->pending_writes);
895 int md_super_wait(struct mddev *mddev)
897 /* wait for all superblock writes that were scheduled to complete */
898 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
899 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
904 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
905 struct page *page, int op, int op_flags, bool metadata_op)
907 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
910 if (metadata_op && rdev->meta_bdev)
911 bio_set_dev(bio, rdev->meta_bdev);
913 bio_set_dev(bio, rdev->bdev);
914 bio_set_op_attrs(bio, op, op_flags);
916 bio->bi_iter.bi_sector = sector + rdev->sb_start;
917 else if (rdev->mddev->reshape_position != MaxSector &&
918 (rdev->mddev->reshape_backwards ==
919 (sector >= rdev->mddev->reshape_position)))
920 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
922 bio->bi_iter.bi_sector = sector + rdev->data_offset;
923 bio_add_page(bio, page, size, 0);
925 submit_bio_wait(bio);
927 ret = !bio->bi_status;
931 EXPORT_SYMBOL_GPL(sync_page_io);
933 static int read_disk_sb(struct md_rdev *rdev, int size)
935 char b[BDEVNAME_SIZE];
940 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
946 pr_err("md: disabled device %s, could not read superblock.\n",
947 bdevname(rdev->bdev,b));
951 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
953 return sb1->set_uuid0 == sb2->set_uuid0 &&
954 sb1->set_uuid1 == sb2->set_uuid1 &&
955 sb1->set_uuid2 == sb2->set_uuid2 &&
956 sb1->set_uuid3 == sb2->set_uuid3;
959 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
962 mdp_super_t *tmp1, *tmp2;
964 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
965 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
967 if (!tmp1 || !tmp2) {
976 * nr_disks is not constant
981 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
988 static u32 md_csum_fold(u32 csum)
990 csum = (csum & 0xffff) + (csum >> 16);
991 return (csum & 0xffff) + (csum >> 16);
994 static unsigned int calc_sb_csum(mdp_super_t *sb)
997 u32 *sb32 = (u32*)sb;
999 unsigned int disk_csum, csum;
1001 disk_csum = sb->sb_csum;
1004 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1006 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1009 /* This used to use csum_partial, which was wrong for several
1010 * reasons including that different results are returned on
1011 * different architectures. It isn't critical that we get exactly
1012 * the same return value as before (we always csum_fold before
1013 * testing, and that removes any differences). However as we
1014 * know that csum_partial always returned a 16bit value on
1015 * alphas, do a fold to maximise conformity to previous behaviour.
1017 sb->sb_csum = md_csum_fold(disk_csum);
1019 sb->sb_csum = disk_csum;
1025 * Handle superblock details.
1026 * We want to be able to handle multiple superblock formats
1027 * so we have a common interface to them all, and an array of
1028 * different handlers.
1029 * We rely on user-space to write the initial superblock, and support
1030 * reading and updating of superblocks.
1031 * Interface methods are:
1032 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1033 * loads and validates a superblock on dev.
1034 * if refdev != NULL, compare superblocks on both devices
1036 * 0 - dev has a superblock that is compatible with refdev
1037 * 1 - dev has a superblock that is compatible and newer than refdev
1038 * so dev should be used as the refdev in future
1039 * -EINVAL superblock incompatible or invalid
1040 * -othererror e.g. -EIO
1042 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1043 * Verify that dev is acceptable into mddev.
1044 * The first time, mddev->raid_disks will be 0, and data from
1045 * dev should be merged in. Subsequent calls check that dev
1046 * is new enough. Return 0 or -EINVAL
1048 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1049 * Update the superblock for rdev with data in mddev
1050 * This does not write to disc.
1056 struct module *owner;
1057 int (*load_super)(struct md_rdev *rdev,
1058 struct md_rdev *refdev,
1060 int (*validate_super)(struct mddev *mddev,
1061 struct md_rdev *rdev);
1062 void (*sync_super)(struct mddev *mddev,
1063 struct md_rdev *rdev);
1064 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1065 sector_t num_sectors);
1066 int (*allow_new_offset)(struct md_rdev *rdev,
1067 unsigned long long new_offset);
1071 * Check that the given mddev has no bitmap.
1073 * This function is called from the run method of all personalities that do not
1074 * support bitmaps. It prints an error message and returns non-zero if mddev
1075 * has a bitmap. Otherwise, it returns 0.
1078 int md_check_no_bitmap(struct mddev *mddev)
1080 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1082 pr_warn("%s: bitmaps are not supported for %s\n",
1083 mdname(mddev), mddev->pers->name);
1086 EXPORT_SYMBOL(md_check_no_bitmap);
1089 * load_super for 0.90.0
1091 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1093 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1098 * Calculate the position of the superblock (512byte sectors),
1099 * it's at the end of the disk.
1101 * It also happens to be a multiple of 4Kb.
1103 rdev->sb_start = calc_dev_sboffset(rdev);
1105 ret = read_disk_sb(rdev, MD_SB_BYTES);
1111 bdevname(rdev->bdev, b);
1112 sb = page_address(rdev->sb_page);
1114 if (sb->md_magic != MD_SB_MAGIC) {
1115 pr_warn("md: invalid raid superblock magic on %s\n", b);
1119 if (sb->major_version != 0 ||
1120 sb->minor_version < 90 ||
1121 sb->minor_version > 91) {
1122 pr_warn("Bad version number %d.%d on %s\n",
1123 sb->major_version, sb->minor_version, b);
1127 if (sb->raid_disks <= 0)
1130 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1131 pr_warn("md: invalid superblock checksum on %s\n", b);
1135 rdev->preferred_minor = sb->md_minor;
1136 rdev->data_offset = 0;
1137 rdev->new_data_offset = 0;
1138 rdev->sb_size = MD_SB_BYTES;
1139 rdev->badblocks.shift = -1;
1141 if (sb->level == LEVEL_MULTIPATH)
1144 rdev->desc_nr = sb->this_disk.number;
1150 mdp_super_t *refsb = page_address(refdev->sb_page);
1151 if (!md_uuid_equal(refsb, sb)) {
1152 pr_warn("md: %s has different UUID to %s\n",
1153 b, bdevname(refdev->bdev,b2));
1156 if (!md_sb_equal(refsb, sb)) {
1157 pr_warn("md: %s has same UUID but different superblock to %s\n",
1158 b, bdevname(refdev->bdev, b2));
1162 ev2 = md_event(refsb);
1168 rdev->sectors = rdev->sb_start;
1169 /* Limit to 4TB as metadata cannot record more than that.
1170 * (not needed for Linear and RAID0 as metadata doesn't
1173 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1174 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1176 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1177 /* "this cannot possibly happen" ... */
1185 * validate_super for 0.90.0
1187 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1190 mdp_super_t *sb = page_address(rdev->sb_page);
1191 __u64 ev1 = md_event(sb);
1193 rdev->raid_disk = -1;
1194 clear_bit(Faulty, &rdev->flags);
1195 clear_bit(In_sync, &rdev->flags);
1196 clear_bit(Bitmap_sync, &rdev->flags);
1197 clear_bit(WriteMostly, &rdev->flags);
1199 if (mddev->raid_disks == 0) {
1200 mddev->major_version = 0;
1201 mddev->minor_version = sb->minor_version;
1202 mddev->patch_version = sb->patch_version;
1203 mddev->external = 0;
1204 mddev->chunk_sectors = sb->chunk_size >> 9;
1205 mddev->ctime = sb->ctime;
1206 mddev->utime = sb->utime;
1207 mddev->level = sb->level;
1208 mddev->clevel[0] = 0;
1209 mddev->layout = sb->layout;
1210 mddev->raid_disks = sb->raid_disks;
1211 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1212 mddev->events = ev1;
1213 mddev->bitmap_info.offset = 0;
1214 mddev->bitmap_info.space = 0;
1215 /* bitmap can use 60 K after the 4K superblocks */
1216 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1217 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1218 mddev->reshape_backwards = 0;
1220 if (mddev->minor_version >= 91) {
1221 mddev->reshape_position = sb->reshape_position;
1222 mddev->delta_disks = sb->delta_disks;
1223 mddev->new_level = sb->new_level;
1224 mddev->new_layout = sb->new_layout;
1225 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1226 if (mddev->delta_disks < 0)
1227 mddev->reshape_backwards = 1;
1229 mddev->reshape_position = MaxSector;
1230 mddev->delta_disks = 0;
1231 mddev->new_level = mddev->level;
1232 mddev->new_layout = mddev->layout;
1233 mddev->new_chunk_sectors = mddev->chunk_sectors;
1236 if (sb->state & (1<<MD_SB_CLEAN))
1237 mddev->recovery_cp = MaxSector;
1239 if (sb->events_hi == sb->cp_events_hi &&
1240 sb->events_lo == sb->cp_events_lo) {
1241 mddev->recovery_cp = sb->recovery_cp;
1243 mddev->recovery_cp = 0;
1246 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1247 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1248 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1249 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1251 mddev->max_disks = MD_SB_DISKS;
1253 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1254 mddev->bitmap_info.file == NULL) {
1255 mddev->bitmap_info.offset =
1256 mddev->bitmap_info.default_offset;
1257 mddev->bitmap_info.space =
1258 mddev->bitmap_info.default_space;
1261 } else if (mddev->pers == NULL) {
1262 /* Insist on good event counter while assembling, except
1263 * for spares (which don't need an event count) */
1265 if (sb->disks[rdev->desc_nr].state & (
1266 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1267 if (ev1 < mddev->events)
1269 } else if (mddev->bitmap) {
1270 /* if adding to array with a bitmap, then we can accept an
1271 * older device ... but not too old.
1273 if (ev1 < mddev->bitmap->events_cleared)
1275 if (ev1 < mddev->events)
1276 set_bit(Bitmap_sync, &rdev->flags);
1278 if (ev1 < mddev->events)
1279 /* just a hot-add of a new device, leave raid_disk at -1 */
1283 if (mddev->level != LEVEL_MULTIPATH) {
1284 desc = sb->disks + rdev->desc_nr;
1286 if (desc->state & (1<<MD_DISK_FAULTY))
1287 set_bit(Faulty, &rdev->flags);
1288 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1289 desc->raid_disk < mddev->raid_disks */) {
1290 set_bit(In_sync, &rdev->flags);
1291 rdev->raid_disk = desc->raid_disk;
1292 rdev->saved_raid_disk = desc->raid_disk;
1293 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1294 /* active but not in sync implies recovery up to
1295 * reshape position. We don't know exactly where
1296 * that is, so set to zero for now */
1297 if (mddev->minor_version >= 91) {
1298 rdev->recovery_offset = 0;
1299 rdev->raid_disk = desc->raid_disk;
1302 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1303 set_bit(WriteMostly, &rdev->flags);
1304 if (desc->state & (1<<MD_DISK_FAILFAST))
1305 set_bit(FailFast, &rdev->flags);
1306 } else /* MULTIPATH are always insync */
1307 set_bit(In_sync, &rdev->flags);
1312 * sync_super for 0.90.0
1314 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1317 struct md_rdev *rdev2;
1318 int next_spare = mddev->raid_disks;
1320 /* make rdev->sb match mddev data..
1323 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1324 * 3/ any empty disks < next_spare become removed
1326 * disks[0] gets initialised to REMOVED because
1327 * we cannot be sure from other fields if it has
1328 * been initialised or not.
1331 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1333 rdev->sb_size = MD_SB_BYTES;
1335 sb = page_address(rdev->sb_page);
1337 memset(sb, 0, sizeof(*sb));
1339 sb->md_magic = MD_SB_MAGIC;
1340 sb->major_version = mddev->major_version;
1341 sb->patch_version = mddev->patch_version;
1342 sb->gvalid_words = 0; /* ignored */
1343 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1344 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1345 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1346 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1348 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1349 sb->level = mddev->level;
1350 sb->size = mddev->dev_sectors / 2;
1351 sb->raid_disks = mddev->raid_disks;
1352 sb->md_minor = mddev->md_minor;
1353 sb->not_persistent = 0;
1354 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1356 sb->events_hi = (mddev->events>>32);
1357 sb->events_lo = (u32)mddev->events;
1359 if (mddev->reshape_position == MaxSector)
1360 sb->minor_version = 90;
1362 sb->minor_version = 91;
1363 sb->reshape_position = mddev->reshape_position;
1364 sb->new_level = mddev->new_level;
1365 sb->delta_disks = mddev->delta_disks;
1366 sb->new_layout = mddev->new_layout;
1367 sb->new_chunk = mddev->new_chunk_sectors << 9;
1369 mddev->minor_version = sb->minor_version;
1372 sb->recovery_cp = mddev->recovery_cp;
1373 sb->cp_events_hi = (mddev->events>>32);
1374 sb->cp_events_lo = (u32)mddev->events;
1375 if (mddev->recovery_cp == MaxSector)
1376 sb->state = (1<< MD_SB_CLEAN);
1378 sb->recovery_cp = 0;
1380 sb->layout = mddev->layout;
1381 sb->chunk_size = mddev->chunk_sectors << 9;
1383 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1384 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1386 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1387 rdev_for_each(rdev2, mddev) {
1390 int is_active = test_bit(In_sync, &rdev2->flags);
1392 if (rdev2->raid_disk >= 0 &&
1393 sb->minor_version >= 91)
1394 /* we have nowhere to store the recovery_offset,
1395 * but if it is not below the reshape_position,
1396 * we can piggy-back on that.
1399 if (rdev2->raid_disk < 0 ||
1400 test_bit(Faulty, &rdev2->flags))
1403 desc_nr = rdev2->raid_disk;
1405 desc_nr = next_spare++;
1406 rdev2->desc_nr = desc_nr;
1407 d = &sb->disks[rdev2->desc_nr];
1409 d->number = rdev2->desc_nr;
1410 d->major = MAJOR(rdev2->bdev->bd_dev);
1411 d->minor = MINOR(rdev2->bdev->bd_dev);
1413 d->raid_disk = rdev2->raid_disk;
1415 d->raid_disk = rdev2->desc_nr; /* compatibility */
1416 if (test_bit(Faulty, &rdev2->flags))
1417 d->state = (1<<MD_DISK_FAULTY);
1418 else if (is_active) {
1419 d->state = (1<<MD_DISK_ACTIVE);
1420 if (test_bit(In_sync, &rdev2->flags))
1421 d->state |= (1<<MD_DISK_SYNC);
1429 if (test_bit(WriteMostly, &rdev2->flags))
1430 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1431 if (test_bit(FailFast, &rdev2->flags))
1432 d->state |= (1<<MD_DISK_FAILFAST);
1434 /* now set the "removed" and "faulty" bits on any missing devices */
1435 for (i=0 ; i < mddev->raid_disks ; i++) {
1436 mdp_disk_t *d = &sb->disks[i];
1437 if (d->state == 0 && d->number == 0) {
1440 d->state = (1<<MD_DISK_REMOVED);
1441 d->state |= (1<<MD_DISK_FAULTY);
1445 sb->nr_disks = nr_disks;
1446 sb->active_disks = active;
1447 sb->working_disks = working;
1448 sb->failed_disks = failed;
1449 sb->spare_disks = spare;
1451 sb->this_disk = sb->disks[rdev->desc_nr];
1452 sb->sb_csum = calc_sb_csum(sb);
1456 * rdev_size_change for 0.90.0
1458 static unsigned long long
1459 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1461 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1462 return 0; /* component must fit device */
1463 if (rdev->mddev->bitmap_info.offset)
1464 return 0; /* can't move bitmap */
1465 rdev->sb_start = calc_dev_sboffset(rdev);
1466 if (!num_sectors || num_sectors > rdev->sb_start)
1467 num_sectors = rdev->sb_start;
1468 /* Limit to 4TB as metadata cannot record more than that.
1469 * 4TB == 2^32 KB, or 2*2^32 sectors.
1471 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1472 num_sectors = (sector_t)(2ULL << 32) - 2;
1474 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1476 } while (md_super_wait(rdev->mddev) < 0);
1481 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1483 /* non-zero offset changes not possible with v0.90 */
1484 return new_offset == 0;
1488 * version 1 superblock
1491 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1495 unsigned long long newcsum;
1496 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1497 __le32 *isuper = (__le32*)sb;
1499 disk_csum = sb->sb_csum;
1502 for (; size >= 4; size -= 4)
1503 newcsum += le32_to_cpu(*isuper++);
1506 newcsum += le16_to_cpu(*(__le16*) isuper);
1508 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1509 sb->sb_csum = disk_csum;
1510 return cpu_to_le32(csum);
1513 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1515 struct mdp_superblock_1 *sb;
1519 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1523 * Calculate the position of the superblock in 512byte sectors.
1524 * It is always aligned to a 4K boundary and
1525 * depeding on minor_version, it can be:
1526 * 0: At least 8K, but less than 12K, from end of device
1527 * 1: At start of device
1528 * 2: 4K from start of device.
1530 switch(minor_version) {
1532 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1534 sb_start &= ~(sector_t)(4*2-1);
1545 rdev->sb_start = sb_start;
1547 /* superblock is rarely larger than 1K, but it can be larger,
1548 * and it is safe to read 4k, so we do that
1550 ret = read_disk_sb(rdev, 4096);
1551 if (ret) return ret;
1553 sb = page_address(rdev->sb_page);
1555 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1556 sb->major_version != cpu_to_le32(1) ||
1557 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1558 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1559 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1562 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1563 pr_warn("md: invalid superblock checksum on %s\n",
1564 bdevname(rdev->bdev,b));
1567 if (le64_to_cpu(sb->data_size) < 10) {
1568 pr_warn("md: data_size too small on %s\n",
1569 bdevname(rdev->bdev,b));
1574 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1575 /* Some padding is non-zero, might be a new feature */
1578 rdev->preferred_minor = 0xffff;
1579 rdev->data_offset = le64_to_cpu(sb->data_offset);
1580 rdev->new_data_offset = rdev->data_offset;
1581 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1582 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1583 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1584 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1586 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1587 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1588 if (rdev->sb_size & bmask)
1589 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1592 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1595 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1598 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1601 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1603 if (!rdev->bb_page) {
1604 rdev->bb_page = alloc_page(GFP_KERNEL);
1608 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1609 rdev->badblocks.count == 0) {
1610 /* need to load the bad block list.
1611 * Currently we limit it to one page.
1617 int sectors = le16_to_cpu(sb->bblog_size);
1618 if (sectors > (PAGE_SIZE / 512))
1620 offset = le32_to_cpu(sb->bblog_offset);
1623 bb_sector = (long long)offset;
1624 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1625 rdev->bb_page, REQ_OP_READ, 0, true))
1627 bbp = (__le64 *)page_address(rdev->bb_page);
1628 rdev->badblocks.shift = sb->bblog_shift;
1629 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1630 u64 bb = le64_to_cpu(*bbp);
1631 int count = bb & (0x3ff);
1632 u64 sector = bb >> 10;
1633 sector <<= sb->bblog_shift;
1634 count <<= sb->bblog_shift;
1637 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1640 } else if (sb->bblog_offset != 0)
1641 rdev->badblocks.shift = 0;
1643 if ((le32_to_cpu(sb->feature_map) &
1644 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1645 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1646 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1647 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1654 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1656 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1657 sb->level != refsb->level ||
1658 sb->layout != refsb->layout ||
1659 sb->chunksize != refsb->chunksize) {
1660 pr_warn("md: %s has strangely different superblock to %s\n",
1661 bdevname(rdev->bdev,b),
1662 bdevname(refdev->bdev,b2));
1665 ev1 = le64_to_cpu(sb->events);
1666 ev2 = le64_to_cpu(refsb->events);
1673 if (minor_version) {
1674 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1675 sectors -= rdev->data_offset;
1677 sectors = rdev->sb_start;
1678 if (sectors < le64_to_cpu(sb->data_size))
1680 rdev->sectors = le64_to_cpu(sb->data_size);
1684 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1686 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1687 __u64 ev1 = le64_to_cpu(sb->events);
1689 rdev->raid_disk = -1;
1690 clear_bit(Faulty, &rdev->flags);
1691 clear_bit(In_sync, &rdev->flags);
1692 clear_bit(Bitmap_sync, &rdev->flags);
1693 clear_bit(WriteMostly, &rdev->flags);
1695 if (mddev->raid_disks == 0) {
1696 mddev->major_version = 1;
1697 mddev->patch_version = 0;
1698 mddev->external = 0;
1699 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1700 mddev->ctime = le64_to_cpu(sb->ctime);
1701 mddev->utime = le64_to_cpu(sb->utime);
1702 mddev->level = le32_to_cpu(sb->level);
1703 mddev->clevel[0] = 0;
1704 mddev->layout = le32_to_cpu(sb->layout);
1705 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1706 mddev->dev_sectors = le64_to_cpu(sb->size);
1707 mddev->events = ev1;
1708 mddev->bitmap_info.offset = 0;
1709 mddev->bitmap_info.space = 0;
1710 /* Default location for bitmap is 1K after superblock
1711 * using 3K - total of 4K
1713 mddev->bitmap_info.default_offset = 1024 >> 9;
1714 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1715 mddev->reshape_backwards = 0;
1717 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1718 memcpy(mddev->uuid, sb->set_uuid, 16);
1720 mddev->max_disks = (4096-256)/2;
1722 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1723 mddev->bitmap_info.file == NULL) {
1724 mddev->bitmap_info.offset =
1725 (__s32)le32_to_cpu(sb->bitmap_offset);
1726 /* Metadata doesn't record how much space is available.
1727 * For 1.0, we assume we can use up to the superblock
1728 * if before, else to 4K beyond superblock.
1729 * For others, assume no change is possible.
1731 if (mddev->minor_version > 0)
1732 mddev->bitmap_info.space = 0;
1733 else if (mddev->bitmap_info.offset > 0)
1734 mddev->bitmap_info.space =
1735 8 - mddev->bitmap_info.offset;
1737 mddev->bitmap_info.space =
1738 -mddev->bitmap_info.offset;
1741 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1742 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1743 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1744 mddev->new_level = le32_to_cpu(sb->new_level);
1745 mddev->new_layout = le32_to_cpu(sb->new_layout);
1746 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1747 if (mddev->delta_disks < 0 ||
1748 (mddev->delta_disks == 0 &&
1749 (le32_to_cpu(sb->feature_map)
1750 & MD_FEATURE_RESHAPE_BACKWARDS)))
1751 mddev->reshape_backwards = 1;
1753 mddev->reshape_position = MaxSector;
1754 mddev->delta_disks = 0;
1755 mddev->new_level = mddev->level;
1756 mddev->new_layout = mddev->layout;
1757 mddev->new_chunk_sectors = mddev->chunk_sectors;
1760 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1761 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1763 if (le32_to_cpu(sb->feature_map) &
1764 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1765 if (le32_to_cpu(sb->feature_map) &
1766 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1768 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1769 (le32_to_cpu(sb->feature_map) &
1770 MD_FEATURE_MULTIPLE_PPLS))
1772 set_bit(MD_HAS_PPL, &mddev->flags);
1774 } else if (mddev->pers == NULL) {
1775 /* Insist of good event counter while assembling, except for
1776 * spares (which don't need an event count) */
1778 if (rdev->desc_nr >= 0 &&
1779 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1780 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1781 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1782 if (ev1 < mddev->events)
1784 } else if (mddev->bitmap) {
1785 /* If adding to array with a bitmap, then we can accept an
1786 * older device, but not too old.
1788 if (ev1 < mddev->bitmap->events_cleared)
1790 if (ev1 < mddev->events)
1791 set_bit(Bitmap_sync, &rdev->flags);
1793 if (ev1 < mddev->events)
1794 /* just a hot-add of a new device, leave raid_disk at -1 */
1797 if (mddev->level != LEVEL_MULTIPATH) {
1799 if (rdev->desc_nr < 0 ||
1800 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1801 role = MD_DISK_ROLE_SPARE;
1804 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1806 case MD_DISK_ROLE_SPARE: /* spare */
1808 case MD_DISK_ROLE_FAULTY: /* faulty */
1809 set_bit(Faulty, &rdev->flags);
1811 case MD_DISK_ROLE_JOURNAL: /* journal device */
1812 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1813 /* journal device without journal feature */
1814 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1817 set_bit(Journal, &rdev->flags);
1818 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1819 rdev->raid_disk = 0;
1822 rdev->saved_raid_disk = role;
1823 if ((le32_to_cpu(sb->feature_map) &
1824 MD_FEATURE_RECOVERY_OFFSET)) {
1825 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1826 if (!(le32_to_cpu(sb->feature_map) &
1827 MD_FEATURE_RECOVERY_BITMAP))
1828 rdev->saved_raid_disk = -1;
1830 set_bit(In_sync, &rdev->flags);
1831 rdev->raid_disk = role;
1834 if (sb->devflags & WriteMostly1)
1835 set_bit(WriteMostly, &rdev->flags);
1836 if (sb->devflags & FailFast1)
1837 set_bit(FailFast, &rdev->flags);
1838 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1839 set_bit(Replacement, &rdev->flags);
1840 } else /* MULTIPATH are always insync */
1841 set_bit(In_sync, &rdev->flags);
1846 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1848 struct mdp_superblock_1 *sb;
1849 struct md_rdev *rdev2;
1851 /* make rdev->sb match mddev and rdev data. */
1853 sb = page_address(rdev->sb_page);
1855 sb->feature_map = 0;
1857 sb->recovery_offset = cpu_to_le64(0);
1858 memset(sb->pad3, 0, sizeof(sb->pad3));
1860 sb->utime = cpu_to_le64((__u64)mddev->utime);
1861 sb->events = cpu_to_le64(mddev->events);
1863 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1864 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1865 sb->resync_offset = cpu_to_le64(MaxSector);
1867 sb->resync_offset = cpu_to_le64(0);
1869 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1871 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1872 sb->size = cpu_to_le64(mddev->dev_sectors);
1873 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1874 sb->level = cpu_to_le32(mddev->level);
1875 sb->layout = cpu_to_le32(mddev->layout);
1876 if (test_bit(FailFast, &rdev->flags))
1877 sb->devflags |= FailFast1;
1879 sb->devflags &= ~FailFast1;
1881 if (test_bit(WriteMostly, &rdev->flags))
1882 sb->devflags |= WriteMostly1;
1884 sb->devflags &= ~WriteMostly1;
1885 sb->data_offset = cpu_to_le64(rdev->data_offset);
1886 sb->data_size = cpu_to_le64(rdev->sectors);
1888 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1889 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1890 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1893 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1894 !test_bit(In_sync, &rdev->flags)) {
1896 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1897 sb->recovery_offset =
1898 cpu_to_le64(rdev->recovery_offset);
1899 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1901 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1903 /* Note: recovery_offset and journal_tail share space */
1904 if (test_bit(Journal, &rdev->flags))
1905 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1906 if (test_bit(Replacement, &rdev->flags))
1908 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1910 if (mddev->reshape_position != MaxSector) {
1911 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1912 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1913 sb->new_layout = cpu_to_le32(mddev->new_layout);
1914 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1915 sb->new_level = cpu_to_le32(mddev->new_level);
1916 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1917 if (mddev->delta_disks == 0 &&
1918 mddev->reshape_backwards)
1920 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1921 if (rdev->new_data_offset != rdev->data_offset) {
1923 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1924 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1925 - rdev->data_offset));
1929 if (mddev_is_clustered(mddev))
1930 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1932 if (rdev->badblocks.count == 0)
1933 /* Nothing to do for bad blocks*/ ;
1934 else if (sb->bblog_offset == 0)
1935 /* Cannot record bad blocks on this device */
1936 md_error(mddev, rdev);
1938 struct badblocks *bb = &rdev->badblocks;
1939 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
1941 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1946 seq = read_seqbegin(&bb->lock);
1948 memset(bbp, 0xff, PAGE_SIZE);
1950 for (i = 0 ; i < bb->count ; i++) {
1951 u64 internal_bb = p[i];
1952 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1953 | BB_LEN(internal_bb));
1954 bbp[i] = cpu_to_le64(store_bb);
1957 if (read_seqretry(&bb->lock, seq))
1960 bb->sector = (rdev->sb_start +
1961 (int)le32_to_cpu(sb->bblog_offset));
1962 bb->size = le16_to_cpu(sb->bblog_size);
1967 rdev_for_each(rdev2, mddev)
1968 if (rdev2->desc_nr+1 > max_dev)
1969 max_dev = rdev2->desc_nr+1;
1971 if (max_dev > le32_to_cpu(sb->max_dev)) {
1973 sb->max_dev = cpu_to_le32(max_dev);
1974 rdev->sb_size = max_dev * 2 + 256;
1975 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1976 if (rdev->sb_size & bmask)
1977 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1979 max_dev = le32_to_cpu(sb->max_dev);
1981 for (i=0; i<max_dev;i++)
1982 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1984 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1985 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1987 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
1988 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
1990 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
1992 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
1993 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
1994 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
1997 rdev_for_each(rdev2, mddev) {
1999 if (test_bit(Faulty, &rdev2->flags))
2000 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2001 else if (test_bit(In_sync, &rdev2->flags))
2002 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2003 else if (test_bit(Journal, &rdev2->flags))
2004 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2005 else if (rdev2->raid_disk >= 0)
2006 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2008 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2011 sb->sb_csum = calc_sb_1_csum(sb);
2014 static unsigned long long
2015 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2017 struct mdp_superblock_1 *sb;
2018 sector_t max_sectors;
2019 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2020 return 0; /* component must fit device */
2021 if (rdev->data_offset != rdev->new_data_offset)
2022 return 0; /* too confusing */
2023 if (rdev->sb_start < rdev->data_offset) {
2024 /* minor versions 1 and 2; superblock before data */
2025 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2026 max_sectors -= rdev->data_offset;
2027 if (!num_sectors || num_sectors > max_sectors)
2028 num_sectors = max_sectors;
2029 } else if (rdev->mddev->bitmap_info.offset) {
2030 /* minor version 0 with bitmap we can't move */
2033 /* minor version 0; superblock after data */
2035 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
2036 sb_start &= ~(sector_t)(4*2 - 1);
2037 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
2038 if (!num_sectors || num_sectors > max_sectors)
2039 num_sectors = max_sectors;
2040 rdev->sb_start = sb_start;
2042 sb = page_address(rdev->sb_page);
2043 sb->data_size = cpu_to_le64(num_sectors);
2044 sb->super_offset = cpu_to_le64(rdev->sb_start);
2045 sb->sb_csum = calc_sb_1_csum(sb);
2047 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2049 } while (md_super_wait(rdev->mddev) < 0);
2055 super_1_allow_new_offset(struct md_rdev *rdev,
2056 unsigned long long new_offset)
2058 /* All necessary checks on new >= old have been done */
2059 struct bitmap *bitmap;
2060 if (new_offset >= rdev->data_offset)
2063 /* with 1.0 metadata, there is no metadata to tread on
2064 * so we can always move back */
2065 if (rdev->mddev->minor_version == 0)
2068 /* otherwise we must be sure not to step on
2069 * any metadata, so stay:
2070 * 36K beyond start of superblock
2071 * beyond end of badblocks
2072 * beyond write-intent bitmap
2074 if (rdev->sb_start + (32+4)*2 > new_offset)
2076 bitmap = rdev->mddev->bitmap;
2077 if (bitmap && !rdev->mddev->bitmap_info.file &&
2078 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2079 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2081 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2087 static struct super_type super_types[] = {
2090 .owner = THIS_MODULE,
2091 .load_super = super_90_load,
2092 .validate_super = super_90_validate,
2093 .sync_super = super_90_sync,
2094 .rdev_size_change = super_90_rdev_size_change,
2095 .allow_new_offset = super_90_allow_new_offset,
2099 .owner = THIS_MODULE,
2100 .load_super = super_1_load,
2101 .validate_super = super_1_validate,
2102 .sync_super = super_1_sync,
2103 .rdev_size_change = super_1_rdev_size_change,
2104 .allow_new_offset = super_1_allow_new_offset,
2108 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2110 if (mddev->sync_super) {
2111 mddev->sync_super(mddev, rdev);
2115 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2117 super_types[mddev->major_version].sync_super(mddev, rdev);
2120 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2122 struct md_rdev *rdev, *rdev2;
2125 rdev_for_each_rcu(rdev, mddev1) {
2126 if (test_bit(Faulty, &rdev->flags) ||
2127 test_bit(Journal, &rdev->flags) ||
2128 rdev->raid_disk == -1)
2130 rdev_for_each_rcu(rdev2, mddev2) {
2131 if (test_bit(Faulty, &rdev2->flags) ||
2132 test_bit(Journal, &rdev2->flags) ||
2133 rdev2->raid_disk == -1)
2135 if (rdev->bdev->bd_contains ==
2136 rdev2->bdev->bd_contains) {
2146 static LIST_HEAD(pending_raid_disks);
2149 * Try to register data integrity profile for an mddev
2151 * This is called when an array is started and after a disk has been kicked
2152 * from the array. It only succeeds if all working and active component devices
2153 * are integrity capable with matching profiles.
2155 int md_integrity_register(struct mddev *mddev)
2157 struct md_rdev *rdev, *reference = NULL;
2159 if (list_empty(&mddev->disks))
2160 return 0; /* nothing to do */
2161 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2162 return 0; /* shouldn't register, or already is */
2163 rdev_for_each(rdev, mddev) {
2164 /* skip spares and non-functional disks */
2165 if (test_bit(Faulty, &rdev->flags))
2167 if (rdev->raid_disk < 0)
2170 /* Use the first rdev as the reference */
2174 /* does this rdev's profile match the reference profile? */
2175 if (blk_integrity_compare(reference->bdev->bd_disk,
2176 rdev->bdev->bd_disk) < 0)
2179 if (!reference || !bdev_get_integrity(reference->bdev))
2182 * All component devices are integrity capable and have matching
2183 * profiles, register the common profile for the md device.
2185 blk_integrity_register(mddev->gendisk,
2186 bdev_get_integrity(reference->bdev));
2188 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2189 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2190 pr_err("md: failed to create integrity pool for %s\n",
2196 EXPORT_SYMBOL(md_integrity_register);
2199 * Attempt to add an rdev, but only if it is consistent with the current
2202 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2204 struct blk_integrity *bi_mddev;
2205 char name[BDEVNAME_SIZE];
2207 if (!mddev->gendisk)
2210 bi_mddev = blk_get_integrity(mddev->gendisk);
2212 if (!bi_mddev) /* nothing to do */
2215 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2216 pr_err("%s: incompatible integrity profile for %s\n",
2217 mdname(mddev), bdevname(rdev->bdev, name));
2223 EXPORT_SYMBOL(md_integrity_add_rdev);
2225 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2227 char b[BDEVNAME_SIZE];
2231 /* prevent duplicates */
2232 if (find_rdev(mddev, rdev->bdev->bd_dev))
2235 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2239 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2240 if (!test_bit(Journal, &rdev->flags) &&
2242 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2244 /* Cannot change size, so fail
2245 * If mddev->level <= 0, then we don't care
2246 * about aligning sizes (e.g. linear)
2248 if (mddev->level > 0)
2251 mddev->dev_sectors = rdev->sectors;
2254 /* Verify rdev->desc_nr is unique.
2255 * If it is -1, assign a free number, else
2256 * check number is not in use
2259 if (rdev->desc_nr < 0) {
2262 choice = mddev->raid_disks;
2263 while (md_find_rdev_nr_rcu(mddev, choice))
2265 rdev->desc_nr = choice;
2267 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2273 if (!test_bit(Journal, &rdev->flags) &&
2274 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2275 pr_warn("md: %s: array is limited to %d devices\n",
2276 mdname(mddev), mddev->max_disks);
2279 bdevname(rdev->bdev,b);
2280 strreplace(b, '/', '!');
2282 rdev->mddev = mddev;
2283 pr_debug("md: bind<%s>\n", b);
2285 if (mddev->raid_disks)
2286 mddev_create_wb_pool(mddev, rdev, false);
2288 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2291 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2292 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2293 /* failure here is OK */;
2294 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2296 list_add_rcu(&rdev->same_set, &mddev->disks);
2297 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2299 /* May as well allow recovery to be retried once */
2300 mddev->recovery_disabled++;
2305 pr_warn("md: failed to register dev-%s for %s\n",
2310 static void md_delayed_delete(struct work_struct *ws)
2312 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2313 kobject_del(&rdev->kobj);
2314 kobject_put(&rdev->kobj);
2317 static void unbind_rdev_from_array(struct md_rdev *rdev)
2319 char b[BDEVNAME_SIZE];
2321 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2322 list_del_rcu(&rdev->same_set);
2323 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2324 mddev_destroy_wb_pool(rdev->mddev, rdev);
2326 sysfs_remove_link(&rdev->kobj, "block");
2327 sysfs_put(rdev->sysfs_state);
2328 rdev->sysfs_state = NULL;
2329 rdev->badblocks.count = 0;
2330 /* We need to delay this, otherwise we can deadlock when
2331 * writing to 'remove' to "dev/state". We also need
2332 * to delay it due to rcu usage.
2335 INIT_WORK(&rdev->del_work, md_delayed_delete);
2336 kobject_get(&rdev->kobj);
2337 queue_work(md_misc_wq, &rdev->del_work);
2341 * prevent the device from being mounted, repartitioned or
2342 * otherwise reused by a RAID array (or any other kernel
2343 * subsystem), by bd_claiming the device.
2345 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2348 struct block_device *bdev;
2349 char b[BDEVNAME_SIZE];
2351 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2352 shared ? (struct md_rdev *)lock_rdev : rdev);
2354 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2355 return PTR_ERR(bdev);
2361 static void unlock_rdev(struct md_rdev *rdev)
2363 struct block_device *bdev = rdev->bdev;
2365 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2368 void md_autodetect_dev(dev_t dev);
2370 static void export_rdev(struct md_rdev *rdev)
2372 char b[BDEVNAME_SIZE];
2374 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2375 md_rdev_clear(rdev);
2377 if (test_bit(AutoDetected, &rdev->flags))
2378 md_autodetect_dev(rdev->bdev->bd_dev);
2381 kobject_put(&rdev->kobj);
2384 void md_kick_rdev_from_array(struct md_rdev *rdev)
2386 unbind_rdev_from_array(rdev);
2389 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2391 static void export_array(struct mddev *mddev)
2393 struct md_rdev *rdev;
2395 while (!list_empty(&mddev->disks)) {
2396 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2398 md_kick_rdev_from_array(rdev);
2400 mddev->raid_disks = 0;
2401 mddev->major_version = 0;
2404 static bool set_in_sync(struct mddev *mddev)
2406 lockdep_assert_held(&mddev->lock);
2407 if (!mddev->in_sync) {
2408 mddev->sync_checkers++;
2409 spin_unlock(&mddev->lock);
2410 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2411 spin_lock(&mddev->lock);
2412 if (!mddev->in_sync &&
2413 percpu_ref_is_zero(&mddev->writes_pending)) {
2416 * Ensure ->in_sync is visible before we clear
2420 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2421 sysfs_notify_dirent_safe(mddev->sysfs_state);
2423 if (--mddev->sync_checkers == 0)
2424 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2426 if (mddev->safemode == 1)
2427 mddev->safemode = 0;
2428 return mddev->in_sync;
2431 static void sync_sbs(struct mddev *mddev, int nospares)
2433 /* Update each superblock (in-memory image), but
2434 * if we are allowed to, skip spares which already
2435 * have the right event counter, or have one earlier
2436 * (which would mean they aren't being marked as dirty
2437 * with the rest of the array)
2439 struct md_rdev *rdev;
2440 rdev_for_each(rdev, mddev) {
2441 if (rdev->sb_events == mddev->events ||
2443 rdev->raid_disk < 0 &&
2444 rdev->sb_events+1 == mddev->events)) {
2445 /* Don't update this superblock */
2446 rdev->sb_loaded = 2;
2448 sync_super(mddev, rdev);
2449 rdev->sb_loaded = 1;
2454 static bool does_sb_need_changing(struct mddev *mddev)
2456 struct md_rdev *rdev;
2457 struct mdp_superblock_1 *sb;
2460 /* Find a good rdev */
2461 rdev_for_each(rdev, mddev)
2462 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2465 /* No good device found. */
2469 sb = page_address(rdev->sb_page);
2470 /* Check if a device has become faulty or a spare become active */
2471 rdev_for_each(rdev, mddev) {
2472 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2473 /* Device activated? */
2474 if (role == 0xffff && rdev->raid_disk >=0 &&
2475 !test_bit(Faulty, &rdev->flags))
2477 /* Device turned faulty? */
2478 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2482 /* Check if any mddev parameters have changed */
2483 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2484 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2485 (mddev->layout != le32_to_cpu(sb->layout)) ||
2486 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2487 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2493 void md_update_sb(struct mddev *mddev, int force_change)
2495 struct md_rdev *rdev;
2498 int any_badblocks_changed = 0;
2503 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2508 if (mddev_is_clustered(mddev)) {
2509 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2511 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2513 ret = md_cluster_ops->metadata_update_start(mddev);
2514 /* Has someone else has updated the sb */
2515 if (!does_sb_need_changing(mddev)) {
2517 md_cluster_ops->metadata_update_cancel(mddev);
2518 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2519 BIT(MD_SB_CHANGE_DEVS) |
2520 BIT(MD_SB_CHANGE_CLEAN));
2526 * First make sure individual recovery_offsets are correct
2527 * curr_resync_completed can only be used during recovery.
2528 * During reshape/resync it might use array-addresses rather
2529 * that device addresses.
2531 rdev_for_each(rdev, mddev) {
2532 if (rdev->raid_disk >= 0 &&
2533 mddev->delta_disks >= 0 &&
2534 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2535 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2536 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2537 !test_bit(Journal, &rdev->flags) &&
2538 !test_bit(In_sync, &rdev->flags) &&
2539 mddev->curr_resync_completed > rdev->recovery_offset)
2540 rdev->recovery_offset = mddev->curr_resync_completed;
2543 if (!mddev->persistent) {
2544 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2545 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2546 if (!mddev->external) {
2547 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2548 rdev_for_each(rdev, mddev) {
2549 if (rdev->badblocks.changed) {
2550 rdev->badblocks.changed = 0;
2551 ack_all_badblocks(&rdev->badblocks);
2552 md_error(mddev, rdev);
2554 clear_bit(Blocked, &rdev->flags);
2555 clear_bit(BlockedBadBlocks, &rdev->flags);
2556 wake_up(&rdev->blocked_wait);
2559 wake_up(&mddev->sb_wait);
2563 spin_lock(&mddev->lock);
2565 mddev->utime = ktime_get_real_seconds();
2567 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2569 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2570 /* just a clean<-> dirty transition, possibly leave spares alone,
2571 * though if events isn't the right even/odd, we will have to do
2577 if (mddev->degraded)
2578 /* If the array is degraded, then skipping spares is both
2579 * dangerous and fairly pointless.
2580 * Dangerous because a device that was removed from the array
2581 * might have a event_count that still looks up-to-date,
2582 * so it can be re-added without a resync.
2583 * Pointless because if there are any spares to skip,
2584 * then a recovery will happen and soon that array won't
2585 * be degraded any more and the spare can go back to sleep then.
2589 sync_req = mddev->in_sync;
2591 /* If this is just a dirty<->clean transition, and the array is clean
2592 * and 'events' is odd, we can roll back to the previous clean state */
2594 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2595 && mddev->can_decrease_events
2596 && mddev->events != 1) {
2598 mddev->can_decrease_events = 0;
2600 /* otherwise we have to go forward and ... */
2602 mddev->can_decrease_events = nospares;
2606 * This 64-bit counter should never wrap.
2607 * Either we are in around ~1 trillion A.C., assuming
2608 * 1 reboot per second, or we have a bug...
2610 WARN_ON(mddev->events == 0);
2612 rdev_for_each(rdev, mddev) {
2613 if (rdev->badblocks.changed)
2614 any_badblocks_changed++;
2615 if (test_bit(Faulty, &rdev->flags))
2616 set_bit(FaultRecorded, &rdev->flags);
2619 sync_sbs(mddev, nospares);
2620 spin_unlock(&mddev->lock);
2622 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2623 mdname(mddev), mddev->in_sync);
2626 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2628 md_bitmap_update_sb(mddev->bitmap);
2629 rdev_for_each(rdev, mddev) {
2630 char b[BDEVNAME_SIZE];
2632 if (rdev->sb_loaded != 1)
2633 continue; /* no noise on spare devices */
2635 if (!test_bit(Faulty, &rdev->flags)) {
2636 md_super_write(mddev,rdev,
2637 rdev->sb_start, rdev->sb_size,
2639 pr_debug("md: (write) %s's sb offset: %llu\n",
2640 bdevname(rdev->bdev, b),
2641 (unsigned long long)rdev->sb_start);
2642 rdev->sb_events = mddev->events;
2643 if (rdev->badblocks.size) {
2644 md_super_write(mddev, rdev,
2645 rdev->badblocks.sector,
2646 rdev->badblocks.size << 9,
2648 rdev->badblocks.size = 0;
2652 pr_debug("md: %s (skipping faulty)\n",
2653 bdevname(rdev->bdev, b));
2655 if (mddev->level == LEVEL_MULTIPATH)
2656 /* only need to write one superblock... */
2659 if (md_super_wait(mddev) < 0)
2661 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2663 if (mddev_is_clustered(mddev) && ret == 0)
2664 md_cluster_ops->metadata_update_finish(mddev);
2666 if (mddev->in_sync != sync_req ||
2667 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2668 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2669 /* have to write it out again */
2671 wake_up(&mddev->sb_wait);
2672 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2673 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2675 rdev_for_each(rdev, mddev) {
2676 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2677 clear_bit(Blocked, &rdev->flags);
2679 if (any_badblocks_changed)
2680 ack_all_badblocks(&rdev->badblocks);
2681 clear_bit(BlockedBadBlocks, &rdev->flags);
2682 wake_up(&rdev->blocked_wait);
2685 EXPORT_SYMBOL(md_update_sb);
2687 static int add_bound_rdev(struct md_rdev *rdev)
2689 struct mddev *mddev = rdev->mddev;
2691 bool add_journal = test_bit(Journal, &rdev->flags);
2693 if (!mddev->pers->hot_remove_disk || add_journal) {
2694 /* If there is hot_add_disk but no hot_remove_disk
2695 * then added disks for geometry changes,
2696 * and should be added immediately.
2698 super_types[mddev->major_version].
2699 validate_super(mddev, rdev);
2701 mddev_suspend(mddev);
2702 err = mddev->pers->hot_add_disk(mddev, rdev);
2704 mddev_resume(mddev);
2706 md_kick_rdev_from_array(rdev);
2710 sysfs_notify_dirent_safe(rdev->sysfs_state);
2712 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2713 if (mddev->degraded)
2714 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2715 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2716 md_new_event(mddev);
2717 md_wakeup_thread(mddev->thread);
2721 /* words written to sysfs files may, or may not, be \n terminated.
2722 * We want to accept with case. For this we use cmd_match.
2724 static int cmd_match(const char *cmd, const char *str)
2726 /* See if cmd, written into a sysfs file, matches
2727 * str. They must either be the same, or cmd can
2728 * have a trailing newline
2730 while (*cmd && *str && *cmd == *str) {
2741 struct rdev_sysfs_entry {
2742 struct attribute attr;
2743 ssize_t (*show)(struct md_rdev *, char *);
2744 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2748 state_show(struct md_rdev *rdev, char *page)
2752 unsigned long flags = READ_ONCE(rdev->flags);
2754 if (test_bit(Faulty, &flags) ||
2755 (!test_bit(ExternalBbl, &flags) &&
2756 rdev->badblocks.unacked_exist))
2757 len += sprintf(page+len, "faulty%s", sep);
2758 if (test_bit(In_sync, &flags))
2759 len += sprintf(page+len, "in_sync%s", sep);
2760 if (test_bit(Journal, &flags))
2761 len += sprintf(page+len, "journal%s", sep);
2762 if (test_bit(WriteMostly, &flags))
2763 len += sprintf(page+len, "write_mostly%s", sep);
2764 if (test_bit(Blocked, &flags) ||
2765 (rdev->badblocks.unacked_exist
2766 && !test_bit(Faulty, &flags)))
2767 len += sprintf(page+len, "blocked%s", sep);
2768 if (!test_bit(Faulty, &flags) &&
2769 !test_bit(Journal, &flags) &&
2770 !test_bit(In_sync, &flags))
2771 len += sprintf(page+len, "spare%s", sep);
2772 if (test_bit(WriteErrorSeen, &flags))
2773 len += sprintf(page+len, "write_error%s", sep);
2774 if (test_bit(WantReplacement, &flags))
2775 len += sprintf(page+len, "want_replacement%s", sep);
2776 if (test_bit(Replacement, &flags))
2777 len += sprintf(page+len, "replacement%s", sep);
2778 if (test_bit(ExternalBbl, &flags))
2779 len += sprintf(page+len, "external_bbl%s", sep);
2780 if (test_bit(FailFast, &flags))
2781 len += sprintf(page+len, "failfast%s", sep);
2786 return len+sprintf(page+len, "\n");
2790 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2793 * faulty - simulates an error
2794 * remove - disconnects the device
2795 * writemostly - sets write_mostly
2796 * -writemostly - clears write_mostly
2797 * blocked - sets the Blocked flags
2798 * -blocked - clears the Blocked and possibly simulates an error
2799 * insync - sets Insync providing device isn't active
2800 * -insync - clear Insync for a device with a slot assigned,
2801 * so that it gets rebuilt based on bitmap
2802 * write_error - sets WriteErrorSeen
2803 * -write_error - clears WriteErrorSeen
2804 * {,-}failfast - set/clear FailFast
2807 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2808 md_error(rdev->mddev, rdev);
2809 if (test_bit(Faulty, &rdev->flags))
2813 } else if (cmd_match(buf, "remove")) {
2814 if (rdev->mddev->pers) {
2815 clear_bit(Blocked, &rdev->flags);
2816 remove_and_add_spares(rdev->mddev, rdev);
2818 if (rdev->raid_disk >= 0)
2821 struct mddev *mddev = rdev->mddev;
2823 if (mddev_is_clustered(mddev))
2824 err = md_cluster_ops->remove_disk(mddev, rdev);
2827 md_kick_rdev_from_array(rdev);
2829 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2830 md_wakeup_thread(mddev->thread);
2832 md_new_event(mddev);
2835 } else if (cmd_match(buf, "writemostly")) {
2836 set_bit(WriteMostly, &rdev->flags);
2837 mddev_create_wb_pool(rdev->mddev, rdev, false);
2839 } else if (cmd_match(buf, "-writemostly")) {
2840 mddev_destroy_wb_pool(rdev->mddev, rdev);
2841 clear_bit(WriteMostly, &rdev->flags);
2843 } else if (cmd_match(buf, "blocked")) {
2844 set_bit(Blocked, &rdev->flags);
2846 } else if (cmd_match(buf, "-blocked")) {
2847 if (!test_bit(Faulty, &rdev->flags) &&
2848 !test_bit(ExternalBbl, &rdev->flags) &&
2849 rdev->badblocks.unacked_exist) {
2850 /* metadata handler doesn't understand badblocks,
2851 * so we need to fail the device
2853 md_error(rdev->mddev, rdev);
2855 clear_bit(Blocked, &rdev->flags);
2856 clear_bit(BlockedBadBlocks, &rdev->flags);
2857 wake_up(&rdev->blocked_wait);
2858 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2859 md_wakeup_thread(rdev->mddev->thread);
2862 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2863 set_bit(In_sync, &rdev->flags);
2865 } else if (cmd_match(buf, "failfast")) {
2866 set_bit(FailFast, &rdev->flags);
2868 } else if (cmd_match(buf, "-failfast")) {
2869 clear_bit(FailFast, &rdev->flags);
2871 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2872 !test_bit(Journal, &rdev->flags)) {
2873 if (rdev->mddev->pers == NULL) {
2874 clear_bit(In_sync, &rdev->flags);
2875 rdev->saved_raid_disk = rdev->raid_disk;
2876 rdev->raid_disk = -1;
2879 } else if (cmd_match(buf, "write_error")) {
2880 set_bit(WriteErrorSeen, &rdev->flags);
2882 } else if (cmd_match(buf, "-write_error")) {
2883 clear_bit(WriteErrorSeen, &rdev->flags);
2885 } else if (cmd_match(buf, "want_replacement")) {
2886 /* Any non-spare device that is not a replacement can
2887 * become want_replacement at any time, but we then need to
2888 * check if recovery is needed.
2890 if (rdev->raid_disk >= 0 &&
2891 !test_bit(Journal, &rdev->flags) &&
2892 !test_bit(Replacement, &rdev->flags))
2893 set_bit(WantReplacement, &rdev->flags);
2894 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2895 md_wakeup_thread(rdev->mddev->thread);
2897 } else if (cmd_match(buf, "-want_replacement")) {
2898 /* Clearing 'want_replacement' is always allowed.
2899 * Once replacements starts it is too late though.
2902 clear_bit(WantReplacement, &rdev->flags);
2903 } else if (cmd_match(buf, "replacement")) {
2904 /* Can only set a device as a replacement when array has not
2905 * yet been started. Once running, replacement is automatic
2906 * from spares, or by assigning 'slot'.
2908 if (rdev->mddev->pers)
2911 set_bit(Replacement, &rdev->flags);
2914 } else if (cmd_match(buf, "-replacement")) {
2915 /* Similarly, can only clear Replacement before start */
2916 if (rdev->mddev->pers)
2919 clear_bit(Replacement, &rdev->flags);
2922 } else if (cmd_match(buf, "re-add")) {
2923 if (!rdev->mddev->pers)
2925 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2926 rdev->saved_raid_disk >= 0) {
2927 /* clear_bit is performed _after_ all the devices
2928 * have their local Faulty bit cleared. If any writes
2929 * happen in the meantime in the local node, they
2930 * will land in the local bitmap, which will be synced
2931 * by this node eventually
2933 if (!mddev_is_clustered(rdev->mddev) ||
2934 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2935 clear_bit(Faulty, &rdev->flags);
2936 err = add_bound_rdev(rdev);
2940 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2941 set_bit(ExternalBbl, &rdev->flags);
2942 rdev->badblocks.shift = 0;
2944 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2945 clear_bit(ExternalBbl, &rdev->flags);
2949 sysfs_notify_dirent_safe(rdev->sysfs_state);
2950 return err ? err : len;
2952 static struct rdev_sysfs_entry rdev_state =
2953 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2956 errors_show(struct md_rdev *rdev, char *page)
2958 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2962 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2967 rv = kstrtouint(buf, 10, &n);
2970 atomic_set(&rdev->corrected_errors, n);
2973 static struct rdev_sysfs_entry rdev_errors =
2974 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2977 slot_show(struct md_rdev *rdev, char *page)
2979 if (test_bit(Journal, &rdev->flags))
2980 return sprintf(page, "journal\n");
2981 else if (rdev->raid_disk < 0)
2982 return sprintf(page, "none\n");
2984 return sprintf(page, "%d\n", rdev->raid_disk);
2988 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2993 if (test_bit(Journal, &rdev->flags))
2995 if (strncmp(buf, "none", 4)==0)
2998 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3002 if (rdev->mddev->pers && slot == -1) {
3003 /* Setting 'slot' on an active array requires also
3004 * updating the 'rd%d' link, and communicating
3005 * with the personality with ->hot_*_disk.
3006 * For now we only support removing
3007 * failed/spare devices. This normally happens automatically,
3008 * but not when the metadata is externally managed.
3010 if (rdev->raid_disk == -1)
3012 /* personality does all needed checks */
3013 if (rdev->mddev->pers->hot_remove_disk == NULL)
3015 clear_bit(Blocked, &rdev->flags);
3016 remove_and_add_spares(rdev->mddev, rdev);
3017 if (rdev->raid_disk >= 0)
3019 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3020 md_wakeup_thread(rdev->mddev->thread);
3021 } else if (rdev->mddev->pers) {
3022 /* Activating a spare .. or possibly reactivating
3023 * if we ever get bitmaps working here.
3027 if (rdev->raid_disk != -1)
3030 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3033 if (rdev->mddev->pers->hot_add_disk == NULL)
3036 if (slot >= rdev->mddev->raid_disks &&
3037 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3040 rdev->raid_disk = slot;
3041 if (test_bit(In_sync, &rdev->flags))
3042 rdev->saved_raid_disk = slot;
3044 rdev->saved_raid_disk = -1;
3045 clear_bit(In_sync, &rdev->flags);
3046 clear_bit(Bitmap_sync, &rdev->flags);
3047 err = rdev->mddev->pers->
3048 hot_add_disk(rdev->mddev, rdev);
3050 rdev->raid_disk = -1;
3053 sysfs_notify_dirent_safe(rdev->sysfs_state);
3054 if (sysfs_link_rdev(rdev->mddev, rdev))
3055 /* failure here is OK */;
3056 /* don't wakeup anyone, leave that to userspace. */
3058 if (slot >= rdev->mddev->raid_disks &&
3059 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3061 rdev->raid_disk = slot;
3062 /* assume it is working */
3063 clear_bit(Faulty, &rdev->flags);
3064 clear_bit(WriteMostly, &rdev->flags);
3065 set_bit(In_sync, &rdev->flags);
3066 sysfs_notify_dirent_safe(rdev->sysfs_state);
3071 static struct rdev_sysfs_entry rdev_slot =
3072 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3075 offset_show(struct md_rdev *rdev, char *page)
3077 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3081 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3083 unsigned long long offset;
3084 if (kstrtoull(buf, 10, &offset) < 0)
3086 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3088 if (rdev->sectors && rdev->mddev->external)
3089 /* Must set offset before size, so overlap checks
3092 rdev->data_offset = offset;
3093 rdev->new_data_offset = offset;
3097 static struct rdev_sysfs_entry rdev_offset =
3098 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3100 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3102 return sprintf(page, "%llu\n",
3103 (unsigned long long)rdev->new_data_offset);
3106 static ssize_t new_offset_store(struct md_rdev *rdev,
3107 const char *buf, size_t len)
3109 unsigned long long new_offset;
3110 struct mddev *mddev = rdev->mddev;
3112 if (kstrtoull(buf, 10, &new_offset) < 0)
3115 if (mddev->sync_thread ||
3116 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3118 if (new_offset == rdev->data_offset)
3119 /* reset is always permitted */
3121 else if (new_offset > rdev->data_offset) {
3122 /* must not push array size beyond rdev_sectors */
3123 if (new_offset - rdev->data_offset
3124 + mddev->dev_sectors > rdev->sectors)
3127 /* Metadata worries about other space details. */
3129 /* decreasing the offset is inconsistent with a backwards
3132 if (new_offset < rdev->data_offset &&
3133 mddev->reshape_backwards)
3135 /* Increasing offset is inconsistent with forwards
3136 * reshape. reshape_direction should be set to
3137 * 'backwards' first.
3139 if (new_offset > rdev->data_offset &&
3140 !mddev->reshape_backwards)
3143 if (mddev->pers && mddev->persistent &&
3144 !super_types[mddev->major_version]
3145 .allow_new_offset(rdev, new_offset))
3147 rdev->new_data_offset = new_offset;
3148 if (new_offset > rdev->data_offset)
3149 mddev->reshape_backwards = 1;
3150 else if (new_offset < rdev->data_offset)
3151 mddev->reshape_backwards = 0;
3155 static struct rdev_sysfs_entry rdev_new_offset =
3156 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3159 rdev_size_show(struct md_rdev *rdev, char *page)
3161 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3164 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3166 /* check if two start/length pairs overlap */
3174 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3176 unsigned long long blocks;
3179 if (kstrtoull(buf, 10, &blocks) < 0)
3182 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3183 return -EINVAL; /* sector conversion overflow */
3186 if (new != blocks * 2)
3187 return -EINVAL; /* unsigned long long to sector_t overflow */
3194 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3196 struct mddev *my_mddev = rdev->mddev;
3197 sector_t oldsectors = rdev->sectors;
3200 if (test_bit(Journal, &rdev->flags))
3202 if (strict_blocks_to_sectors(buf, §ors) < 0)
3204 if (rdev->data_offset != rdev->new_data_offset)
3205 return -EINVAL; /* too confusing */
3206 if (my_mddev->pers && rdev->raid_disk >= 0) {
3207 if (my_mddev->persistent) {
3208 sectors = super_types[my_mddev->major_version].
3209 rdev_size_change(rdev, sectors);
3212 } else if (!sectors)
3213 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3215 if (!my_mddev->pers->resize)
3216 /* Cannot change size for RAID0 or Linear etc */
3219 if (sectors < my_mddev->dev_sectors)
3220 return -EINVAL; /* component must fit device */
3222 rdev->sectors = sectors;
3223 if (sectors > oldsectors && my_mddev->external) {
3224 /* Need to check that all other rdevs with the same
3225 * ->bdev do not overlap. 'rcu' is sufficient to walk
3226 * the rdev lists safely.
3227 * This check does not provide a hard guarantee, it
3228 * just helps avoid dangerous mistakes.
3230 struct mddev *mddev;
3232 struct list_head *tmp;
3235 for_each_mddev(mddev, tmp) {
3236 struct md_rdev *rdev2;
3238 rdev_for_each(rdev2, mddev)
3239 if (rdev->bdev == rdev2->bdev &&
3241 overlaps(rdev->data_offset, rdev->sectors,
3254 /* Someone else could have slipped in a size
3255 * change here, but doing so is just silly.
3256 * We put oldsectors back because we *know* it is
3257 * safe, and trust userspace not to race with
3260 rdev->sectors = oldsectors;
3267 static struct rdev_sysfs_entry rdev_size =
3268 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3270 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3272 unsigned long long recovery_start = rdev->recovery_offset;
3274 if (test_bit(In_sync, &rdev->flags) ||
3275 recovery_start == MaxSector)
3276 return sprintf(page, "none\n");
3278 return sprintf(page, "%llu\n", recovery_start);
3281 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3283 unsigned long long recovery_start;
3285 if (cmd_match(buf, "none"))
3286 recovery_start = MaxSector;
3287 else if (kstrtoull(buf, 10, &recovery_start))
3290 if (rdev->mddev->pers &&
3291 rdev->raid_disk >= 0)
3294 rdev->recovery_offset = recovery_start;
3295 if (recovery_start == MaxSector)
3296 set_bit(In_sync, &rdev->flags);
3298 clear_bit(In_sync, &rdev->flags);
3302 static struct rdev_sysfs_entry rdev_recovery_start =
3303 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3305 /* sysfs access to bad-blocks list.
3306 * We present two files.
3307 * 'bad-blocks' lists sector numbers and lengths of ranges that
3308 * are recorded as bad. The list is truncated to fit within
3309 * the one-page limit of sysfs.
3310 * Writing "sector length" to this file adds an acknowledged
3312 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3313 * been acknowledged. Writing to this file adds bad blocks
3314 * without acknowledging them. This is largely for testing.
3316 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3318 return badblocks_show(&rdev->badblocks, page, 0);
3320 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3322 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3323 /* Maybe that ack was all we needed */
3324 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3325 wake_up(&rdev->blocked_wait);
3328 static struct rdev_sysfs_entry rdev_bad_blocks =
3329 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3331 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3333 return badblocks_show(&rdev->badblocks, page, 1);
3335 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3337 return badblocks_store(&rdev->badblocks, page, len, 1);
3339 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3340 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3343 ppl_sector_show(struct md_rdev *rdev, char *page)
3345 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3349 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3351 unsigned long long sector;
3353 if (kstrtoull(buf, 10, §or) < 0)
3355 if (sector != (sector_t)sector)
3358 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3359 rdev->raid_disk >= 0)
3362 if (rdev->mddev->persistent) {
3363 if (rdev->mddev->major_version == 0)
3365 if ((sector > rdev->sb_start &&
3366 sector - rdev->sb_start > S16_MAX) ||
3367 (sector < rdev->sb_start &&
3368 rdev->sb_start - sector > -S16_MIN))
3370 rdev->ppl.offset = sector - rdev->sb_start;
3371 } else if (!rdev->mddev->external) {
3374 rdev->ppl.sector = sector;
3378 static struct rdev_sysfs_entry rdev_ppl_sector =
3379 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3382 ppl_size_show(struct md_rdev *rdev, char *page)
3384 return sprintf(page, "%u\n", rdev->ppl.size);
3388 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3392 if (kstrtouint(buf, 10, &size) < 0)
3395 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3396 rdev->raid_disk >= 0)
3399 if (rdev->mddev->persistent) {
3400 if (rdev->mddev->major_version == 0)
3404 } else if (!rdev->mddev->external) {
3407 rdev->ppl.size = size;
3411 static struct rdev_sysfs_entry rdev_ppl_size =
3412 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3414 static struct attribute *rdev_default_attrs[] = {
3419 &rdev_new_offset.attr,
3421 &rdev_recovery_start.attr,
3422 &rdev_bad_blocks.attr,
3423 &rdev_unack_bad_blocks.attr,
3424 &rdev_ppl_sector.attr,
3425 &rdev_ppl_size.attr,
3429 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3431 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3432 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3438 return entry->show(rdev, page);
3442 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3443 const char *page, size_t length)
3445 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3446 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3448 struct mddev *mddev = rdev->mddev;
3452 if (!capable(CAP_SYS_ADMIN))
3454 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3456 if (rdev->mddev == NULL)
3459 rv = entry->store(rdev, page, length);
3460 mddev_unlock(mddev);
3465 static void rdev_free(struct kobject *ko)
3467 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3470 static const struct sysfs_ops rdev_sysfs_ops = {
3471 .show = rdev_attr_show,
3472 .store = rdev_attr_store,
3474 static struct kobj_type rdev_ktype = {
3475 .release = rdev_free,
3476 .sysfs_ops = &rdev_sysfs_ops,
3477 .default_attrs = rdev_default_attrs,
3480 int md_rdev_init(struct md_rdev *rdev)
3483 rdev->saved_raid_disk = -1;
3484 rdev->raid_disk = -1;
3486 rdev->data_offset = 0;
3487 rdev->new_data_offset = 0;
3488 rdev->sb_events = 0;
3489 rdev->last_read_error = 0;
3490 rdev->sb_loaded = 0;
3491 rdev->bb_page = NULL;
3492 atomic_set(&rdev->nr_pending, 0);
3493 atomic_set(&rdev->read_errors, 0);
3494 atomic_set(&rdev->corrected_errors, 0);
3496 INIT_LIST_HEAD(&rdev->same_set);
3497 init_waitqueue_head(&rdev->blocked_wait);
3499 /* Add space to store bad block list.
3500 * This reserves the space even on arrays where it cannot
3501 * be used - I wonder if that matters
3503 return badblocks_init(&rdev->badblocks, 0);
3505 EXPORT_SYMBOL_GPL(md_rdev_init);
3507 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3509 * mark the device faulty if:
3511 * - the device is nonexistent (zero size)
3512 * - the device has no valid superblock
3514 * a faulty rdev _never_ has rdev->sb set.
3516 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3518 char b[BDEVNAME_SIZE];
3520 struct md_rdev *rdev;
3523 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3525 return ERR_PTR(-ENOMEM);
3527 err = md_rdev_init(rdev);
3530 err = alloc_disk_sb(rdev);
3534 err = lock_rdev(rdev, newdev, super_format == -2);
3538 kobject_init(&rdev->kobj, &rdev_ktype);
3540 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3542 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3543 bdevname(rdev->bdev,b));
3548 if (super_format >= 0) {
3549 err = super_types[super_format].
3550 load_super(rdev, NULL, super_minor);
3551 if (err == -EINVAL) {
3552 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3553 bdevname(rdev->bdev,b),
3554 super_format, super_minor);
3558 pr_warn("md: could not read %s's sb, not importing!\n",
3559 bdevname(rdev->bdev,b));
3569 md_rdev_clear(rdev);
3571 return ERR_PTR(err);
3575 * Check a full RAID array for plausibility
3578 static void analyze_sbs(struct mddev *mddev)
3581 struct md_rdev *rdev, *freshest, *tmp;
3582 char b[BDEVNAME_SIZE];
3585 rdev_for_each_safe(rdev, tmp, mddev)
3586 switch (super_types[mddev->major_version].
3587 load_super(rdev, freshest, mddev->minor_version)) {
3594 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3595 bdevname(rdev->bdev,b));
3596 md_kick_rdev_from_array(rdev);
3599 super_types[mddev->major_version].
3600 validate_super(mddev, freshest);
3603 rdev_for_each_safe(rdev, tmp, mddev) {
3604 if (mddev->max_disks &&
3605 (rdev->desc_nr >= mddev->max_disks ||
3606 i > mddev->max_disks)) {
3607 pr_warn("md: %s: %s: only %d devices permitted\n",
3608 mdname(mddev), bdevname(rdev->bdev, b),
3610 md_kick_rdev_from_array(rdev);
3613 if (rdev != freshest) {
3614 if (super_types[mddev->major_version].
3615 validate_super(mddev, rdev)) {
3616 pr_warn("md: kicking non-fresh %s from array!\n",
3617 bdevname(rdev->bdev,b));
3618 md_kick_rdev_from_array(rdev);
3622 if (mddev->level == LEVEL_MULTIPATH) {
3623 rdev->desc_nr = i++;
3624 rdev->raid_disk = rdev->desc_nr;
3625 set_bit(In_sync, &rdev->flags);
3626 } else if (rdev->raid_disk >=
3627 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3628 !test_bit(Journal, &rdev->flags)) {
3629 rdev->raid_disk = -1;
3630 clear_bit(In_sync, &rdev->flags);
3635 /* Read a fixed-point number.
3636 * Numbers in sysfs attributes should be in "standard" units where
3637 * possible, so time should be in seconds.
3638 * However we internally use a a much smaller unit such as
3639 * milliseconds or jiffies.
3640 * This function takes a decimal number with a possible fractional
3641 * component, and produces an integer which is the result of
3642 * multiplying that number by 10^'scale'.
3643 * all without any floating-point arithmetic.
3645 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3647 unsigned long result = 0;
3649 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3652 else if (decimals < scale) {
3655 result = result * 10 + value;
3667 while (decimals < scale) {
3676 safe_delay_show(struct mddev *mddev, char *page)
3678 int msec = (mddev->safemode_delay*1000)/HZ;
3679 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3682 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3686 if (mddev_is_clustered(mddev)) {
3687 pr_warn("md: Safemode is disabled for clustered mode\n");
3691 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3694 mddev->safemode_delay = 0;
3696 unsigned long old_delay = mddev->safemode_delay;
3697 unsigned long new_delay = (msec*HZ)/1000;
3701 mddev->safemode_delay = new_delay;
3702 if (new_delay < old_delay || old_delay == 0)
3703 mod_timer(&mddev->safemode_timer, jiffies+1);
3707 static struct md_sysfs_entry md_safe_delay =
3708 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3711 level_show(struct mddev *mddev, char *page)
3713 struct md_personality *p;
3715 spin_lock(&mddev->lock);
3718 ret = sprintf(page, "%s\n", p->name);
3719 else if (mddev->clevel[0])
3720 ret = sprintf(page, "%s\n", mddev->clevel);
3721 else if (mddev->level != LEVEL_NONE)
3722 ret = sprintf(page, "%d\n", mddev->level);
3725 spin_unlock(&mddev->lock);
3730 level_store(struct mddev *mddev, const char *buf, size_t len)
3735 struct md_personality *pers, *oldpers;
3737 void *priv, *oldpriv;
3738 struct md_rdev *rdev;
3740 if (slen == 0 || slen >= sizeof(clevel))
3743 rv = mddev_lock(mddev);
3747 if (mddev->pers == NULL) {
3748 strncpy(mddev->clevel, buf, slen);
3749 if (mddev->clevel[slen-1] == '\n')
3751 mddev->clevel[slen] = 0;
3752 mddev->level = LEVEL_NONE;
3760 /* request to change the personality. Need to ensure:
3761 * - array is not engaged in resync/recovery/reshape
3762 * - old personality can be suspended
3763 * - new personality will access other array.
3767 if (mddev->sync_thread ||
3768 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3769 mddev->reshape_position != MaxSector ||
3770 mddev->sysfs_active)
3774 if (!mddev->pers->quiesce) {
3775 pr_warn("md: %s: %s does not support online personality change\n",
3776 mdname(mddev), mddev->pers->name);
3780 /* Now find the new personality */
3781 strncpy(clevel, buf, slen);
3782 if (clevel[slen-1] == '\n')
3785 if (kstrtol(clevel, 10, &level))
3788 if (request_module("md-%s", clevel) != 0)
3789 request_module("md-level-%s", clevel);
3790 spin_lock(&pers_lock);
3791 pers = find_pers(level, clevel);
3792 if (!pers || !try_module_get(pers->owner)) {
3793 spin_unlock(&pers_lock);
3794 pr_warn("md: personality %s not loaded\n", clevel);
3798 spin_unlock(&pers_lock);
3800 if (pers == mddev->pers) {
3801 /* Nothing to do! */
3802 module_put(pers->owner);
3806 if (!pers->takeover) {
3807 module_put(pers->owner);
3808 pr_warn("md: %s: %s does not support personality takeover\n",
3809 mdname(mddev), clevel);
3814 rdev_for_each(rdev, mddev)
3815 rdev->new_raid_disk = rdev->raid_disk;
3817 /* ->takeover must set new_* and/or delta_disks
3818 * if it succeeds, and may set them when it fails.
3820 priv = pers->takeover(mddev);
3822 mddev->new_level = mddev->level;
3823 mddev->new_layout = mddev->layout;
3824 mddev->new_chunk_sectors = mddev->chunk_sectors;
3825 mddev->raid_disks -= mddev->delta_disks;
3826 mddev->delta_disks = 0;
3827 mddev->reshape_backwards = 0;
3828 module_put(pers->owner);
3829 pr_warn("md: %s: %s would not accept array\n",
3830 mdname(mddev), clevel);
3835 /* Looks like we have a winner */
3836 mddev_suspend(mddev);
3837 mddev_detach(mddev);
3839 spin_lock(&mddev->lock);
3840 oldpers = mddev->pers;
3841 oldpriv = mddev->private;
3843 mddev->private = priv;
3844 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3845 mddev->level = mddev->new_level;
3846 mddev->layout = mddev->new_layout;
3847 mddev->chunk_sectors = mddev->new_chunk_sectors;
3848 mddev->delta_disks = 0;
3849 mddev->reshape_backwards = 0;
3850 mddev->degraded = 0;
3851 spin_unlock(&mddev->lock);
3853 if (oldpers->sync_request == NULL &&
3855 /* We are converting from a no-redundancy array
3856 * to a redundancy array and metadata is managed
3857 * externally so we need to be sure that writes
3858 * won't block due to a need to transition
3860 * until external management is started.
3863 mddev->safemode_delay = 0;
3864 mddev->safemode = 0;
3867 oldpers->free(mddev, oldpriv);
3869 if (oldpers->sync_request == NULL &&
3870 pers->sync_request != NULL) {
3871 /* need to add the md_redundancy_group */
3872 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3873 pr_warn("md: cannot register extra attributes for %s\n",
3875 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3877 if (oldpers->sync_request != NULL &&
3878 pers->sync_request == NULL) {
3879 /* need to remove the md_redundancy_group */
3880 if (mddev->to_remove == NULL)
3881 mddev->to_remove = &md_redundancy_group;
3884 module_put(oldpers->owner);
3886 rdev_for_each(rdev, mddev) {
3887 if (rdev->raid_disk < 0)
3889 if (rdev->new_raid_disk >= mddev->raid_disks)
3890 rdev->new_raid_disk = -1;
3891 if (rdev->new_raid_disk == rdev->raid_disk)
3893 sysfs_unlink_rdev(mddev, rdev);
3895 rdev_for_each(rdev, mddev) {
3896 if (rdev->raid_disk < 0)
3898 if (rdev->new_raid_disk == rdev->raid_disk)
3900 rdev->raid_disk = rdev->new_raid_disk;
3901 if (rdev->raid_disk < 0)
3902 clear_bit(In_sync, &rdev->flags);
3904 if (sysfs_link_rdev(mddev, rdev))
3905 pr_warn("md: cannot register rd%d for %s after level change\n",
3906 rdev->raid_disk, mdname(mddev));
3910 if (pers->sync_request == NULL) {
3911 /* this is now an array without redundancy, so
3912 * it must always be in_sync
3915 del_timer_sync(&mddev->safemode_timer);
3917 blk_set_stacking_limits(&mddev->queue->limits);
3919 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3920 mddev_resume(mddev);
3922 md_update_sb(mddev, 1);
3923 sysfs_notify(&mddev->kobj, NULL, "level");
3924 md_new_event(mddev);
3927 mddev_unlock(mddev);
3931 static struct md_sysfs_entry md_level =
3932 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3935 layout_show(struct mddev *mddev, char *page)
3937 /* just a number, not meaningful for all levels */
3938 if (mddev->reshape_position != MaxSector &&
3939 mddev->layout != mddev->new_layout)
3940 return sprintf(page, "%d (%d)\n",
3941 mddev->new_layout, mddev->layout);
3942 return sprintf(page, "%d\n", mddev->layout);
3946 layout_store(struct mddev *mddev, const char *buf, size_t len)
3951 err = kstrtouint(buf, 10, &n);
3954 err = mddev_lock(mddev);
3959 if (mddev->pers->check_reshape == NULL)
3964 mddev->new_layout = n;
3965 err = mddev->pers->check_reshape(mddev);
3967 mddev->new_layout = mddev->layout;
3970 mddev->new_layout = n;
3971 if (mddev->reshape_position == MaxSector)
3974 mddev_unlock(mddev);
3977 static struct md_sysfs_entry md_layout =
3978 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3981 raid_disks_show(struct mddev *mddev, char *page)
3983 if (mddev->raid_disks == 0)
3985 if (mddev->reshape_position != MaxSector &&
3986 mddev->delta_disks != 0)
3987 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3988 mddev->raid_disks - mddev->delta_disks);
3989 return sprintf(page, "%d\n", mddev->raid_disks);
3992 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3995 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4000 err = kstrtouint(buf, 10, &n);
4004 err = mddev_lock(mddev);
4008 err = update_raid_disks(mddev, n);
4009 else if (mddev->reshape_position != MaxSector) {
4010 struct md_rdev *rdev;
4011 int olddisks = mddev->raid_disks - mddev->delta_disks;
4014 rdev_for_each(rdev, mddev) {
4016 rdev->data_offset < rdev->new_data_offset)
4019 rdev->data_offset > rdev->new_data_offset)
4023 mddev->delta_disks = n - olddisks;
4024 mddev->raid_disks = n;
4025 mddev->reshape_backwards = (mddev->delta_disks < 0);
4027 mddev->raid_disks = n;
4029 mddev_unlock(mddev);
4030 return err ? err : len;
4032 static struct md_sysfs_entry md_raid_disks =
4033 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4036 chunk_size_show(struct mddev *mddev, char *page)
4038 if (mddev->reshape_position != MaxSector &&
4039 mddev->chunk_sectors != mddev->new_chunk_sectors)
4040 return sprintf(page, "%d (%d)\n",
4041 mddev->new_chunk_sectors << 9,
4042 mddev->chunk_sectors << 9);
4043 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4047 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4052 err = kstrtoul(buf, 10, &n);
4056 err = mddev_lock(mddev);
4060 if (mddev->pers->check_reshape == NULL)
4065 mddev->new_chunk_sectors = n >> 9;
4066 err = mddev->pers->check_reshape(mddev);
4068 mddev->new_chunk_sectors = mddev->chunk_sectors;
4071 mddev->new_chunk_sectors = n >> 9;
4072 if (mddev->reshape_position == MaxSector)
4073 mddev->chunk_sectors = n >> 9;
4075 mddev_unlock(mddev);
4078 static struct md_sysfs_entry md_chunk_size =
4079 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4082 resync_start_show(struct mddev *mddev, char *page)
4084 if (mddev->recovery_cp == MaxSector)
4085 return sprintf(page, "none\n");
4086 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4090 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4092 unsigned long long n;
4095 if (cmd_match(buf, "none"))
4098 err = kstrtoull(buf, 10, &n);
4101 if (n != (sector_t)n)
4105 err = mddev_lock(mddev);
4108 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4112 mddev->recovery_cp = n;
4114 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4116 mddev_unlock(mddev);
4119 static struct md_sysfs_entry md_resync_start =
4120 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4121 resync_start_show, resync_start_store);
4124 * The array state can be:
4127 * No devices, no size, no level
4128 * Equivalent to STOP_ARRAY ioctl
4130 * May have some settings, but array is not active
4131 * all IO results in error
4132 * When written, doesn't tear down array, but just stops it
4133 * suspended (not supported yet)
4134 * All IO requests will block. The array can be reconfigured.
4135 * Writing this, if accepted, will block until array is quiescent
4137 * no resync can happen. no superblocks get written.
4138 * write requests fail
4140 * like readonly, but behaves like 'clean' on a write request.
4142 * clean - no pending writes, but otherwise active.
4143 * When written to inactive array, starts without resync
4144 * If a write request arrives then
4145 * if metadata is known, mark 'dirty' and switch to 'active'.
4146 * if not known, block and switch to write-pending
4147 * If written to an active array that has pending writes, then fails.
4149 * fully active: IO and resync can be happening.
4150 * When written to inactive array, starts with resync
4153 * clean, but writes are blocked waiting for 'active' to be written.
4156 * like active, but no writes have been seen for a while (100msec).
4159 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4160 write_pending, active_idle, bad_word};
4161 static char *array_states[] = {
4162 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4163 "write-pending", "active-idle", NULL };
4165 static int match_word(const char *word, char **list)
4168 for (n=0; list[n]; n++)
4169 if (cmd_match(word, list[n]))
4175 array_state_show(struct mddev *mddev, char *page)
4177 enum array_state st = inactive;
4188 spin_lock(&mddev->lock);
4189 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4191 else if (mddev->in_sync)
4193 else if (mddev->safemode)
4197 spin_unlock(&mddev->lock);
4200 if (list_empty(&mddev->disks) &&
4201 mddev->raid_disks == 0 &&
4202 mddev->dev_sectors == 0)
4207 return sprintf(page, "%s\n", array_states[st]);
4210 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4211 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4212 static int do_md_run(struct mddev *mddev);
4213 static int restart_array(struct mddev *mddev);
4216 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4219 enum array_state st = match_word(buf, array_states);
4221 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4222 /* don't take reconfig_mutex when toggling between
4225 spin_lock(&mddev->lock);
4227 restart_array(mddev);
4228 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4229 md_wakeup_thread(mddev->thread);
4230 wake_up(&mddev->sb_wait);
4231 } else /* st == clean */ {
4232 restart_array(mddev);
4233 if (!set_in_sync(mddev))
4237 sysfs_notify_dirent_safe(mddev->sysfs_state);
4238 spin_unlock(&mddev->lock);
4241 err = mddev_lock(mddev);
4249 /* stopping an active array */
4250 err = do_md_stop(mddev, 0, NULL);
4253 /* stopping an active array */
4255 err = do_md_stop(mddev, 2, NULL);
4257 err = 0; /* already inactive */
4260 break; /* not supported yet */
4263 err = md_set_readonly(mddev, NULL);
4266 set_disk_ro(mddev->gendisk, 1);
4267 err = do_md_run(mddev);
4273 err = md_set_readonly(mddev, NULL);
4274 else if (mddev->ro == 1)
4275 err = restart_array(mddev);
4278 set_disk_ro(mddev->gendisk, 0);
4282 err = do_md_run(mddev);
4287 err = restart_array(mddev);
4290 spin_lock(&mddev->lock);
4291 if (!set_in_sync(mddev))
4293 spin_unlock(&mddev->lock);
4299 err = restart_array(mddev);
4302 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4303 wake_up(&mddev->sb_wait);
4307 set_disk_ro(mddev->gendisk, 0);
4308 err = do_md_run(mddev);
4313 /* these cannot be set */
4318 if (mddev->hold_active == UNTIL_IOCTL)
4319 mddev->hold_active = 0;
4320 sysfs_notify_dirent_safe(mddev->sysfs_state);
4322 mddev_unlock(mddev);
4325 static struct md_sysfs_entry md_array_state =
4326 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4329 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4330 return sprintf(page, "%d\n",
4331 atomic_read(&mddev->max_corr_read_errors));
4335 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4340 rv = kstrtouint(buf, 10, &n);
4343 atomic_set(&mddev->max_corr_read_errors, n);
4347 static struct md_sysfs_entry max_corr_read_errors =
4348 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4349 max_corrected_read_errors_store);
4352 null_show(struct mddev *mddev, char *page)
4358 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4360 /* buf must be %d:%d\n? giving major and minor numbers */
4361 /* The new device is added to the array.
4362 * If the array has a persistent superblock, we read the
4363 * superblock to initialise info and check validity.
4364 * Otherwise, only checking done is that in bind_rdev_to_array,
4365 * which mainly checks size.
4368 int major = simple_strtoul(buf, &e, 10);
4371 struct md_rdev *rdev;
4374 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4376 minor = simple_strtoul(e+1, &e, 10);
4377 if (*e && *e != '\n')
4379 dev = MKDEV(major, minor);
4380 if (major != MAJOR(dev) ||
4381 minor != MINOR(dev))
4384 flush_workqueue(md_misc_wq);
4386 err = mddev_lock(mddev);
4389 if (mddev->persistent) {
4390 rdev = md_import_device(dev, mddev->major_version,
4391 mddev->minor_version);
4392 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4393 struct md_rdev *rdev0
4394 = list_entry(mddev->disks.next,
4395 struct md_rdev, same_set);
4396 err = super_types[mddev->major_version]
4397 .load_super(rdev, rdev0, mddev->minor_version);
4401 } else if (mddev->external)
4402 rdev = md_import_device(dev, -2, -1);
4404 rdev = md_import_device(dev, -1, -1);
4407 mddev_unlock(mddev);
4408 return PTR_ERR(rdev);
4410 err = bind_rdev_to_array(rdev, mddev);
4414 mddev_unlock(mddev);
4416 md_new_event(mddev);
4417 return err ? err : len;
4420 static struct md_sysfs_entry md_new_device =
4421 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4424 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4427 unsigned long chunk, end_chunk;
4430 err = mddev_lock(mddev);
4435 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4437 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4438 if (buf == end) break;
4439 if (*end == '-') { /* range */
4441 end_chunk = simple_strtoul(buf, &end, 0);
4442 if (buf == end) break;
4444 if (*end && !isspace(*end)) break;
4445 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4446 buf = skip_spaces(end);
4448 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4450 mddev_unlock(mddev);
4454 static struct md_sysfs_entry md_bitmap =
4455 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4458 size_show(struct mddev *mddev, char *page)
4460 return sprintf(page, "%llu\n",
4461 (unsigned long long)mddev->dev_sectors / 2);
4464 static int update_size(struct mddev *mddev, sector_t num_sectors);
4467 size_store(struct mddev *mddev, const char *buf, size_t len)
4469 /* If array is inactive, we can reduce the component size, but
4470 * not increase it (except from 0).
4471 * If array is active, we can try an on-line resize
4474 int err = strict_blocks_to_sectors(buf, §ors);
4478 err = mddev_lock(mddev);
4482 err = update_size(mddev, sectors);
4484 md_update_sb(mddev, 1);
4486 if (mddev->dev_sectors == 0 ||
4487 mddev->dev_sectors > sectors)
4488 mddev->dev_sectors = sectors;
4492 mddev_unlock(mddev);
4493 return err ? err : len;
4496 static struct md_sysfs_entry md_size =
4497 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4499 /* Metadata version.
4501 * 'none' for arrays with no metadata (good luck...)
4502 * 'external' for arrays with externally managed metadata,
4503 * or N.M for internally known formats
4506 metadata_show(struct mddev *mddev, char *page)
4508 if (mddev->persistent)
4509 return sprintf(page, "%d.%d\n",
4510 mddev->major_version, mddev->minor_version);
4511 else if (mddev->external)
4512 return sprintf(page, "external:%s\n", mddev->metadata_type);
4514 return sprintf(page, "none\n");
4518 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4523 /* Changing the details of 'external' metadata is
4524 * always permitted. Otherwise there must be
4525 * no devices attached to the array.
4528 err = mddev_lock(mddev);
4532 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4534 else if (!list_empty(&mddev->disks))
4538 if (cmd_match(buf, "none")) {
4539 mddev->persistent = 0;
4540 mddev->external = 0;
4541 mddev->major_version = 0;
4542 mddev->minor_version = 90;
4545 if (strncmp(buf, "external:", 9) == 0) {
4546 size_t namelen = len-9;
4547 if (namelen >= sizeof(mddev->metadata_type))
4548 namelen = sizeof(mddev->metadata_type)-1;
4549 strncpy(mddev->metadata_type, buf+9, namelen);
4550 mddev->metadata_type[namelen] = 0;
4551 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4552 mddev->metadata_type[--namelen] = 0;
4553 mddev->persistent = 0;
4554 mddev->external = 1;
4555 mddev->major_version = 0;
4556 mddev->minor_version = 90;
4559 major = simple_strtoul(buf, &e, 10);
4561 if (e==buf || *e != '.')
4564 minor = simple_strtoul(buf, &e, 10);
4565 if (e==buf || (*e && *e != '\n') )
4568 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4570 mddev->major_version = major;
4571 mddev->minor_version = minor;
4572 mddev->persistent = 1;
4573 mddev->external = 0;
4576 mddev_unlock(mddev);
4580 static struct md_sysfs_entry md_metadata =
4581 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4584 action_show(struct mddev *mddev, char *page)
4586 char *type = "idle";
4587 unsigned long recovery = mddev->recovery;
4588 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4590 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4591 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4592 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4594 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4595 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4597 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4601 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4603 else if (mddev->reshape_position != MaxSector)
4606 return sprintf(page, "%s\n", type);
4610 action_store(struct mddev *mddev, const char *page, size_t len)
4612 if (!mddev->pers || !mddev->pers->sync_request)
4616 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4617 if (cmd_match(page, "frozen"))
4618 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4620 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4621 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4622 mddev_lock(mddev) == 0) {
4623 flush_workqueue(md_misc_wq);
4624 if (mddev->sync_thread) {
4625 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4626 md_reap_sync_thread(mddev);
4628 mddev_unlock(mddev);
4630 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4632 else if (cmd_match(page, "resync"))
4633 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4634 else if (cmd_match(page, "recover")) {
4635 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4636 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4637 } else if (cmd_match(page, "reshape")) {
4639 if (mddev->pers->start_reshape == NULL)
4641 err = mddev_lock(mddev);
4643 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4646 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4647 err = mddev->pers->start_reshape(mddev);
4649 mddev_unlock(mddev);
4653 sysfs_notify(&mddev->kobj, NULL, "degraded");
4655 if (cmd_match(page, "check"))
4656 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4657 else if (!cmd_match(page, "repair"))
4659 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4660 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4661 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4663 if (mddev->ro == 2) {
4664 /* A write to sync_action is enough to justify
4665 * canceling read-auto mode
4668 md_wakeup_thread(mddev->sync_thread);
4670 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4671 md_wakeup_thread(mddev->thread);
4672 sysfs_notify_dirent_safe(mddev->sysfs_action);
4676 static struct md_sysfs_entry md_scan_mode =
4677 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4680 last_sync_action_show(struct mddev *mddev, char *page)
4682 return sprintf(page, "%s\n", mddev->last_sync_action);
4685 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4688 mismatch_cnt_show(struct mddev *mddev, char *page)
4690 return sprintf(page, "%llu\n",
4691 (unsigned long long)
4692 atomic64_read(&mddev->resync_mismatches));
4695 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4698 sync_min_show(struct mddev *mddev, char *page)
4700 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4701 mddev->sync_speed_min ? "local": "system");
4705 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4710 if (strncmp(buf, "system", 6)==0) {
4713 rv = kstrtouint(buf, 10, &min);
4719 mddev->sync_speed_min = min;
4723 static struct md_sysfs_entry md_sync_min =
4724 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4727 sync_max_show(struct mddev *mddev, char *page)
4729 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4730 mddev->sync_speed_max ? "local": "system");
4734 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4739 if (strncmp(buf, "system", 6)==0) {
4742 rv = kstrtouint(buf, 10, &max);
4748 mddev->sync_speed_max = max;
4752 static struct md_sysfs_entry md_sync_max =
4753 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4756 degraded_show(struct mddev *mddev, char *page)
4758 return sprintf(page, "%d\n", mddev->degraded);
4760 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4763 sync_force_parallel_show(struct mddev *mddev, char *page)
4765 return sprintf(page, "%d\n", mddev->parallel_resync);
4769 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4773 if (kstrtol(buf, 10, &n))
4776 if (n != 0 && n != 1)
4779 mddev->parallel_resync = n;
4781 if (mddev->sync_thread)
4782 wake_up(&resync_wait);
4787 /* force parallel resync, even with shared block devices */
4788 static struct md_sysfs_entry md_sync_force_parallel =
4789 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4790 sync_force_parallel_show, sync_force_parallel_store);
4793 sync_speed_show(struct mddev *mddev, char *page)
4795 unsigned long resync, dt, db;
4796 if (mddev->curr_resync == 0)
4797 return sprintf(page, "none\n");
4798 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4799 dt = (jiffies - mddev->resync_mark) / HZ;
4801 db = resync - mddev->resync_mark_cnt;
4802 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4805 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4808 sync_completed_show(struct mddev *mddev, char *page)
4810 unsigned long long max_sectors, resync;
4812 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4813 return sprintf(page, "none\n");
4815 if (mddev->curr_resync == 1 ||
4816 mddev->curr_resync == 2)
4817 return sprintf(page, "delayed\n");
4819 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4820 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4821 max_sectors = mddev->resync_max_sectors;
4823 max_sectors = mddev->dev_sectors;
4825 resync = mddev->curr_resync_completed;
4826 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4829 static struct md_sysfs_entry md_sync_completed =
4830 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4833 min_sync_show(struct mddev *mddev, char *page)
4835 return sprintf(page, "%llu\n",
4836 (unsigned long long)mddev->resync_min);
4839 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4841 unsigned long long min;
4844 if (kstrtoull(buf, 10, &min))
4847 spin_lock(&mddev->lock);
4849 if (min > mddev->resync_max)
4853 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4856 /* Round down to multiple of 4K for safety */
4857 mddev->resync_min = round_down(min, 8);
4861 spin_unlock(&mddev->lock);
4865 static struct md_sysfs_entry md_min_sync =
4866 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4869 max_sync_show(struct mddev *mddev, char *page)
4871 if (mddev->resync_max == MaxSector)
4872 return sprintf(page, "max\n");
4874 return sprintf(page, "%llu\n",
4875 (unsigned long long)mddev->resync_max);
4878 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4881 spin_lock(&mddev->lock);
4882 if (strncmp(buf, "max", 3) == 0)
4883 mddev->resync_max = MaxSector;
4885 unsigned long long max;
4889 if (kstrtoull(buf, 10, &max))
4891 if (max < mddev->resync_min)
4895 if (max < mddev->resync_max &&
4897 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4900 /* Must be a multiple of chunk_size */
4901 chunk = mddev->chunk_sectors;
4903 sector_t temp = max;
4906 if (sector_div(temp, chunk))
4909 mddev->resync_max = max;
4911 wake_up(&mddev->recovery_wait);
4914 spin_unlock(&mddev->lock);
4918 static struct md_sysfs_entry md_max_sync =
4919 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4922 suspend_lo_show(struct mddev *mddev, char *page)
4924 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4928 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4930 unsigned long long new;
4933 err = kstrtoull(buf, 10, &new);
4936 if (new != (sector_t)new)
4939 err = mddev_lock(mddev);
4943 if (mddev->pers == NULL ||
4944 mddev->pers->quiesce == NULL)
4946 mddev_suspend(mddev);
4947 mddev->suspend_lo = new;
4948 mddev_resume(mddev);
4952 mddev_unlock(mddev);
4955 static struct md_sysfs_entry md_suspend_lo =
4956 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4959 suspend_hi_show(struct mddev *mddev, char *page)
4961 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4965 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4967 unsigned long long new;
4970 err = kstrtoull(buf, 10, &new);
4973 if (new != (sector_t)new)
4976 err = mddev_lock(mddev);
4980 if (mddev->pers == NULL)
4983 mddev_suspend(mddev);
4984 mddev->suspend_hi = new;
4985 mddev_resume(mddev);
4989 mddev_unlock(mddev);
4992 static struct md_sysfs_entry md_suspend_hi =
4993 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4996 reshape_position_show(struct mddev *mddev, char *page)
4998 if (mddev->reshape_position != MaxSector)
4999 return sprintf(page, "%llu\n",
5000 (unsigned long long)mddev->reshape_position);
5001 strcpy(page, "none\n");
5006 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5008 struct md_rdev *rdev;
5009 unsigned long long new;
5012 err = kstrtoull(buf, 10, &new);
5015 if (new != (sector_t)new)
5017 err = mddev_lock(mddev);
5023 mddev->reshape_position = new;
5024 mddev->delta_disks = 0;
5025 mddev->reshape_backwards = 0;
5026 mddev->new_level = mddev->level;
5027 mddev->new_layout = mddev->layout;
5028 mddev->new_chunk_sectors = mddev->chunk_sectors;
5029 rdev_for_each(rdev, mddev)
5030 rdev->new_data_offset = rdev->data_offset;
5033 mddev_unlock(mddev);
5037 static struct md_sysfs_entry md_reshape_position =
5038 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5039 reshape_position_store);
5042 reshape_direction_show(struct mddev *mddev, char *page)
5044 return sprintf(page, "%s\n",
5045 mddev->reshape_backwards ? "backwards" : "forwards");
5049 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5054 if (cmd_match(buf, "forwards"))
5056 else if (cmd_match(buf, "backwards"))
5060 if (mddev->reshape_backwards == backwards)
5063 err = mddev_lock(mddev);
5066 /* check if we are allowed to change */
5067 if (mddev->delta_disks)
5069 else if (mddev->persistent &&
5070 mddev->major_version == 0)
5073 mddev->reshape_backwards = backwards;
5074 mddev_unlock(mddev);
5078 static struct md_sysfs_entry md_reshape_direction =
5079 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5080 reshape_direction_store);
5083 array_size_show(struct mddev *mddev, char *page)
5085 if (mddev->external_size)
5086 return sprintf(page, "%llu\n",
5087 (unsigned long long)mddev->array_sectors/2);
5089 return sprintf(page, "default\n");
5093 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5098 err = mddev_lock(mddev);
5102 /* cluster raid doesn't support change array_sectors */
5103 if (mddev_is_clustered(mddev)) {
5104 mddev_unlock(mddev);
5108 if (strncmp(buf, "default", 7) == 0) {
5110 sectors = mddev->pers->size(mddev, 0, 0);
5112 sectors = mddev->array_sectors;
5114 mddev->external_size = 0;
5116 if (strict_blocks_to_sectors(buf, §ors) < 0)
5118 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5121 mddev->external_size = 1;
5125 mddev->array_sectors = sectors;
5127 set_capacity(mddev->gendisk, mddev->array_sectors);
5128 revalidate_disk(mddev->gendisk);
5131 mddev_unlock(mddev);
5135 static struct md_sysfs_entry md_array_size =
5136 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5140 consistency_policy_show(struct mddev *mddev, char *page)
5144 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5145 ret = sprintf(page, "journal\n");
5146 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5147 ret = sprintf(page, "ppl\n");
5148 } else if (mddev->bitmap) {
5149 ret = sprintf(page, "bitmap\n");
5150 } else if (mddev->pers) {
5151 if (mddev->pers->sync_request)
5152 ret = sprintf(page, "resync\n");
5154 ret = sprintf(page, "none\n");
5156 ret = sprintf(page, "unknown\n");
5163 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5168 if (mddev->pers->change_consistency_policy)
5169 err = mddev->pers->change_consistency_policy(mddev, buf);
5172 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5173 set_bit(MD_HAS_PPL, &mddev->flags);
5178 return err ? err : len;
5181 static struct md_sysfs_entry md_consistency_policy =
5182 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5183 consistency_policy_store);
5185 static struct attribute *md_default_attrs[] = {
5188 &md_raid_disks.attr,
5189 &md_chunk_size.attr,
5191 &md_resync_start.attr,
5193 &md_new_device.attr,
5194 &md_safe_delay.attr,
5195 &md_array_state.attr,
5196 &md_reshape_position.attr,
5197 &md_reshape_direction.attr,
5198 &md_array_size.attr,
5199 &max_corr_read_errors.attr,
5200 &md_consistency_policy.attr,
5204 static struct attribute *md_redundancy_attrs[] = {
5206 &md_last_scan_mode.attr,
5207 &md_mismatches.attr,
5210 &md_sync_speed.attr,
5211 &md_sync_force_parallel.attr,
5212 &md_sync_completed.attr,
5215 &md_suspend_lo.attr,
5216 &md_suspend_hi.attr,
5221 static struct attribute_group md_redundancy_group = {
5223 .attrs = md_redundancy_attrs,
5227 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5229 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5230 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5235 spin_lock(&all_mddevs_lock);
5236 if (list_empty(&mddev->all_mddevs)) {
5237 spin_unlock(&all_mddevs_lock);
5241 spin_unlock(&all_mddevs_lock);
5243 rv = entry->show(mddev, page);
5249 md_attr_store(struct kobject *kobj, struct attribute *attr,
5250 const char *page, size_t length)
5252 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5253 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5258 if (!capable(CAP_SYS_ADMIN))
5260 spin_lock(&all_mddevs_lock);
5261 if (list_empty(&mddev->all_mddevs)) {
5262 spin_unlock(&all_mddevs_lock);
5266 spin_unlock(&all_mddevs_lock);
5267 rv = entry->store(mddev, page, length);
5272 static void md_free(struct kobject *ko)
5274 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5276 if (mddev->sysfs_state)
5277 sysfs_put(mddev->sysfs_state);
5280 del_gendisk(mddev->gendisk);
5282 blk_cleanup_queue(mddev->queue);
5284 put_disk(mddev->gendisk);
5285 percpu_ref_exit(&mddev->writes_pending);
5287 bioset_exit(&mddev->bio_set);
5288 bioset_exit(&mddev->sync_set);
5292 static const struct sysfs_ops md_sysfs_ops = {
5293 .show = md_attr_show,
5294 .store = md_attr_store,
5296 static struct kobj_type md_ktype = {
5298 .sysfs_ops = &md_sysfs_ops,
5299 .default_attrs = md_default_attrs,
5304 static void mddev_delayed_delete(struct work_struct *ws)
5306 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5308 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5309 kobject_del(&mddev->kobj);
5310 kobject_put(&mddev->kobj);
5313 static void no_op(struct percpu_ref *r) {}
5315 int mddev_init_writes_pending(struct mddev *mddev)
5317 if (mddev->writes_pending.percpu_count_ptr)
5319 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5321 /* We want to start with the refcount at zero */
5322 percpu_ref_put(&mddev->writes_pending);
5325 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5327 static int md_alloc(dev_t dev, char *name)
5330 * If dev is zero, name is the name of a device to allocate with
5331 * an arbitrary minor number. It will be "md_???"
5332 * If dev is non-zero it must be a device number with a MAJOR of
5333 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5334 * the device is being created by opening a node in /dev.
5335 * If "name" is not NULL, the device is being created by
5336 * writing to /sys/module/md_mod/parameters/new_array.
5338 static DEFINE_MUTEX(disks_mutex);
5339 struct mddev *mddev = mddev_find(dev);
5340 struct gendisk *disk;
5349 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5350 shift = partitioned ? MdpMinorShift : 0;
5351 unit = MINOR(mddev->unit) >> shift;
5353 /* wait for any previous instance of this device to be
5354 * completely removed (mddev_delayed_delete).
5356 flush_workqueue(md_misc_wq);
5358 mutex_lock(&disks_mutex);
5364 /* Need to ensure that 'name' is not a duplicate.
5366 struct mddev *mddev2;
5367 spin_lock(&all_mddevs_lock);
5369 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5370 if (mddev2->gendisk &&
5371 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5372 spin_unlock(&all_mddevs_lock);
5375 spin_unlock(&all_mddevs_lock);
5379 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5381 mddev->hold_active = UNTIL_STOP;
5384 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5387 mddev->queue->queuedata = mddev;
5389 blk_queue_make_request(mddev->queue, md_make_request);
5390 blk_set_stacking_limits(&mddev->queue->limits);
5392 disk = alloc_disk(1 << shift);
5394 blk_cleanup_queue(mddev->queue);
5395 mddev->queue = NULL;
5398 disk->major = MAJOR(mddev->unit);
5399 disk->first_minor = unit << shift;
5401 strcpy(disk->disk_name, name);
5402 else if (partitioned)
5403 sprintf(disk->disk_name, "md_d%d", unit);
5405 sprintf(disk->disk_name, "md%d", unit);
5406 disk->fops = &md_fops;
5407 disk->private_data = mddev;
5408 disk->queue = mddev->queue;
5409 blk_queue_write_cache(mddev->queue, true, true);
5410 /* Allow extended partitions. This makes the
5411 * 'mdp' device redundant, but we can't really
5414 disk->flags |= GENHD_FL_EXT_DEVT;
5415 mddev->gendisk = disk;
5416 /* As soon as we call add_disk(), another thread could get
5417 * through to md_open, so make sure it doesn't get too far
5419 mutex_lock(&mddev->open_mutex);
5422 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5424 /* This isn't possible, but as kobject_init_and_add is marked
5425 * __must_check, we must do something with the result
5427 pr_debug("md: cannot register %s/md - name in use\n",
5431 if (mddev->kobj.sd &&
5432 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5433 pr_debug("pointless warning\n");
5434 mutex_unlock(&mddev->open_mutex);
5436 mutex_unlock(&disks_mutex);
5437 if (!error && mddev->kobj.sd) {
5438 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5439 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5445 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5448 md_alloc(dev, NULL);
5452 static int add_named_array(const char *val, const struct kernel_param *kp)
5455 * val must be "md_*" or "mdNNN".
5456 * For "md_*" we allocate an array with a large free minor number, and
5457 * set the name to val. val must not already be an active name.
5458 * For "mdNNN" we allocate an array with the minor number NNN
5459 * which must not already be in use.
5461 int len = strlen(val);
5462 char buf[DISK_NAME_LEN];
5463 unsigned long devnum;
5465 while (len && val[len-1] == '\n')
5467 if (len >= DISK_NAME_LEN)
5469 strlcpy(buf, val, len+1);
5470 if (strncmp(buf, "md_", 3) == 0)
5471 return md_alloc(0, buf);
5472 if (strncmp(buf, "md", 2) == 0 &&
5474 kstrtoul(buf+2, 10, &devnum) == 0 &&
5475 devnum <= MINORMASK)
5476 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5481 static void md_safemode_timeout(struct timer_list *t)
5483 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5485 mddev->safemode = 1;
5486 if (mddev->external)
5487 sysfs_notify_dirent_safe(mddev->sysfs_state);
5489 md_wakeup_thread(mddev->thread);
5492 static int start_dirty_degraded;
5494 int md_run(struct mddev *mddev)
5497 struct md_rdev *rdev;
5498 struct md_personality *pers;
5500 if (list_empty(&mddev->disks))
5501 /* cannot run an array with no devices.. */
5506 /* Cannot run until previous stop completes properly */
5507 if (mddev->sysfs_active)
5511 * Analyze all RAID superblock(s)
5513 if (!mddev->raid_disks) {
5514 if (!mddev->persistent)
5519 if (mddev->level != LEVEL_NONE)
5520 request_module("md-level-%d", mddev->level);
5521 else if (mddev->clevel[0])
5522 request_module("md-%s", mddev->clevel);
5525 * Drop all container device buffers, from now on
5526 * the only valid external interface is through the md
5529 mddev->has_superblocks = false;
5530 rdev_for_each(rdev, mddev) {
5531 if (test_bit(Faulty, &rdev->flags))
5533 sync_blockdev(rdev->bdev);
5534 invalidate_bdev(rdev->bdev);
5535 if (mddev->ro != 1 &&
5536 (bdev_read_only(rdev->bdev) ||
5537 bdev_read_only(rdev->meta_bdev))) {
5540 set_disk_ro(mddev->gendisk, 1);
5544 mddev->has_superblocks = true;
5546 /* perform some consistency tests on the device.
5547 * We don't want the data to overlap the metadata,
5548 * Internal Bitmap issues have been handled elsewhere.
5550 if (rdev->meta_bdev) {
5551 /* Nothing to check */;
5552 } else if (rdev->data_offset < rdev->sb_start) {
5553 if (mddev->dev_sectors &&
5554 rdev->data_offset + mddev->dev_sectors
5556 pr_warn("md: %s: data overlaps metadata\n",
5561 if (rdev->sb_start + rdev->sb_size/512
5562 > rdev->data_offset) {
5563 pr_warn("md: %s: metadata overlaps data\n",
5568 sysfs_notify_dirent_safe(rdev->sysfs_state);
5571 if (!bioset_initialized(&mddev->bio_set)) {
5572 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5576 if (!bioset_initialized(&mddev->sync_set)) {
5577 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5582 spin_lock(&pers_lock);
5583 pers = find_pers(mddev->level, mddev->clevel);
5584 if (!pers || !try_module_get(pers->owner)) {
5585 spin_unlock(&pers_lock);
5586 if (mddev->level != LEVEL_NONE)
5587 pr_warn("md: personality for level %d is not loaded!\n",
5590 pr_warn("md: personality for level %s is not loaded!\n",
5595 spin_unlock(&pers_lock);
5596 if (mddev->level != pers->level) {
5597 mddev->level = pers->level;
5598 mddev->new_level = pers->level;
5600 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5602 if (mddev->reshape_position != MaxSector &&
5603 pers->start_reshape == NULL) {
5604 /* This personality cannot handle reshaping... */
5605 module_put(pers->owner);
5610 if (pers->sync_request) {
5611 /* Warn if this is a potentially silly
5614 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5615 struct md_rdev *rdev2;
5618 rdev_for_each(rdev, mddev)
5619 rdev_for_each(rdev2, mddev) {
5621 rdev->bdev->bd_contains ==
5622 rdev2->bdev->bd_contains) {
5623 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5625 bdevname(rdev->bdev,b),
5626 bdevname(rdev2->bdev,b2));
5632 pr_warn("True protection against single-disk failure might be compromised.\n");
5635 mddev->recovery = 0;
5636 /* may be over-ridden by personality */
5637 mddev->resync_max_sectors = mddev->dev_sectors;
5639 mddev->ok_start_degraded = start_dirty_degraded;
5641 if (start_readonly && mddev->ro == 0)
5642 mddev->ro = 2; /* read-only, but switch on first write */
5644 err = pers->run(mddev);
5646 pr_warn("md: pers->run() failed ...\n");
5647 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5648 WARN_ONCE(!mddev->external_size,
5649 "%s: default size too small, but 'external_size' not in effect?\n",
5651 pr_warn("md: invalid array_size %llu > default size %llu\n",
5652 (unsigned long long)mddev->array_sectors / 2,
5653 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5656 if (err == 0 && pers->sync_request &&
5657 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5658 struct bitmap *bitmap;
5660 bitmap = md_bitmap_create(mddev, -1);
5661 if (IS_ERR(bitmap)) {
5662 err = PTR_ERR(bitmap);
5663 pr_warn("%s: failed to create bitmap (%d)\n",
5664 mdname(mddev), err);
5666 mddev->bitmap = bitmap;
5672 if (mddev->bitmap_info.max_write_behind > 0) {
5673 bool creat_pool = false;
5675 rdev_for_each(rdev, mddev) {
5676 if (test_bit(WriteMostly, &rdev->flags) &&
5680 if (creat_pool && mddev->wb_info_pool == NULL) {
5681 mddev->wb_info_pool =
5682 mempool_create_kmalloc_pool(NR_WB_INFOS,
5683 sizeof(struct wb_info));
5684 if (!mddev->wb_info_pool) {
5694 rdev_for_each(rdev, mddev) {
5695 if (rdev->raid_disk >= 0 &&
5696 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5701 if (mddev->degraded)
5704 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5706 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5707 mddev->queue->backing_dev_info->congested_data = mddev;
5708 mddev->queue->backing_dev_info->congested_fn = md_congested;
5710 if (pers->sync_request) {
5711 if (mddev->kobj.sd &&
5712 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5713 pr_warn("md: cannot register extra attributes for %s\n",
5715 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5716 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5719 atomic_set(&mddev->max_corr_read_errors,
5720 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5721 mddev->safemode = 0;
5722 if (mddev_is_clustered(mddev))
5723 mddev->safemode_delay = 0;
5725 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5728 spin_lock(&mddev->lock);
5730 spin_unlock(&mddev->lock);
5731 rdev_for_each(rdev, mddev)
5732 if (rdev->raid_disk >= 0)
5733 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
5735 if (mddev->degraded && !mddev->ro)
5736 /* This ensures that recovering status is reported immediately
5737 * via sysfs - until a lack of spares is confirmed.
5739 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5740 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5742 if (mddev->sb_flags)
5743 md_update_sb(mddev, 0);
5745 md_new_event(mddev);
5746 sysfs_notify_dirent_safe(mddev->sysfs_state);
5747 sysfs_notify_dirent_safe(mddev->sysfs_action);
5748 sysfs_notify(&mddev->kobj, NULL, "degraded");
5752 mddev_detach(mddev);
5754 pers->free(mddev, mddev->private);
5755 mddev->private = NULL;
5756 module_put(pers->owner);
5757 md_bitmap_destroy(mddev);
5759 bioset_exit(&mddev->bio_set);
5760 bioset_exit(&mddev->sync_set);
5763 EXPORT_SYMBOL_GPL(md_run);
5765 static int do_md_run(struct mddev *mddev)
5769 err = md_run(mddev);
5772 err = md_bitmap_load(mddev);
5774 md_bitmap_destroy(mddev);
5778 if (mddev_is_clustered(mddev))
5779 md_allow_write(mddev);
5781 /* run start up tasks that require md_thread */
5784 md_wakeup_thread(mddev->thread);
5785 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5787 set_capacity(mddev->gendisk, mddev->array_sectors);
5788 revalidate_disk(mddev->gendisk);
5790 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5795 int md_start(struct mddev *mddev)
5799 if (mddev->pers->start) {
5800 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5801 md_wakeup_thread(mddev->thread);
5802 ret = mddev->pers->start(mddev);
5803 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5804 md_wakeup_thread(mddev->sync_thread);
5808 EXPORT_SYMBOL_GPL(md_start);
5810 static int restart_array(struct mddev *mddev)
5812 struct gendisk *disk = mddev->gendisk;
5813 struct md_rdev *rdev;
5814 bool has_journal = false;
5815 bool has_readonly = false;
5817 /* Complain if it has no devices */
5818 if (list_empty(&mddev->disks))
5826 rdev_for_each_rcu(rdev, mddev) {
5827 if (test_bit(Journal, &rdev->flags) &&
5828 !test_bit(Faulty, &rdev->flags))
5830 if (bdev_read_only(rdev->bdev))
5831 has_readonly = true;
5834 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5835 /* Don't restart rw with journal missing/faulty */
5840 mddev->safemode = 0;
5842 set_disk_ro(disk, 0);
5843 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5844 /* Kick recovery or resync if necessary */
5845 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5846 md_wakeup_thread(mddev->thread);
5847 md_wakeup_thread(mddev->sync_thread);
5848 sysfs_notify_dirent_safe(mddev->sysfs_state);
5852 static void md_clean(struct mddev *mddev)
5854 mddev->array_sectors = 0;
5855 mddev->external_size = 0;
5856 mddev->dev_sectors = 0;
5857 mddev->raid_disks = 0;
5858 mddev->recovery_cp = 0;
5859 mddev->resync_min = 0;
5860 mddev->resync_max = MaxSector;
5861 mddev->reshape_position = MaxSector;
5862 mddev->external = 0;
5863 mddev->persistent = 0;
5864 mddev->level = LEVEL_NONE;
5865 mddev->clevel[0] = 0;
5867 mddev->sb_flags = 0;
5869 mddev->metadata_type[0] = 0;
5870 mddev->chunk_sectors = 0;
5871 mddev->ctime = mddev->utime = 0;
5873 mddev->max_disks = 0;
5875 mddev->can_decrease_events = 0;
5876 mddev->delta_disks = 0;
5877 mddev->reshape_backwards = 0;
5878 mddev->new_level = LEVEL_NONE;
5879 mddev->new_layout = 0;
5880 mddev->new_chunk_sectors = 0;
5881 mddev->curr_resync = 0;
5882 atomic64_set(&mddev->resync_mismatches, 0);
5883 mddev->suspend_lo = mddev->suspend_hi = 0;
5884 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5885 mddev->recovery = 0;
5888 mddev->degraded = 0;
5889 mddev->safemode = 0;
5890 mddev->private = NULL;
5891 mddev->cluster_info = NULL;
5892 mddev->bitmap_info.offset = 0;
5893 mddev->bitmap_info.default_offset = 0;
5894 mddev->bitmap_info.default_space = 0;
5895 mddev->bitmap_info.chunksize = 0;
5896 mddev->bitmap_info.daemon_sleep = 0;
5897 mddev->bitmap_info.max_write_behind = 0;
5898 mddev->bitmap_info.nodes = 0;
5901 static void __md_stop_writes(struct mddev *mddev)
5903 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5904 flush_workqueue(md_misc_wq);
5905 if (mddev->sync_thread) {
5906 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5907 md_reap_sync_thread(mddev);
5910 del_timer_sync(&mddev->safemode_timer);
5912 if (mddev->pers && mddev->pers->quiesce) {
5913 mddev->pers->quiesce(mddev, 1);
5914 mddev->pers->quiesce(mddev, 0);
5916 md_bitmap_flush(mddev);
5918 if (mddev->ro == 0 &&
5919 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5921 /* mark array as shutdown cleanly */
5922 if (!mddev_is_clustered(mddev))
5924 md_update_sb(mddev, 1);
5926 mempool_destroy(mddev->wb_info_pool);
5927 mddev->wb_info_pool = NULL;
5930 void md_stop_writes(struct mddev *mddev)
5932 mddev_lock_nointr(mddev);
5933 __md_stop_writes(mddev);
5934 mddev_unlock(mddev);
5936 EXPORT_SYMBOL_GPL(md_stop_writes);
5938 static void mddev_detach(struct mddev *mddev)
5940 md_bitmap_wait_behind_writes(mddev);
5941 if (mddev->pers && mddev->pers->quiesce) {
5942 mddev->pers->quiesce(mddev, 1);
5943 mddev->pers->quiesce(mddev, 0);
5945 md_unregister_thread(&mddev->thread);
5947 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5950 static void __md_stop(struct mddev *mddev)
5952 struct md_personality *pers = mddev->pers;
5953 md_bitmap_destroy(mddev);
5954 mddev_detach(mddev);
5955 /* Ensure ->event_work is done */
5956 flush_workqueue(md_misc_wq);
5957 spin_lock(&mddev->lock);
5959 spin_unlock(&mddev->lock);
5960 pers->free(mddev, mddev->private);
5961 mddev->private = NULL;
5962 if (pers->sync_request && mddev->to_remove == NULL)
5963 mddev->to_remove = &md_redundancy_group;
5964 module_put(pers->owner);
5965 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5968 void md_stop(struct mddev *mddev)
5970 /* stop the array and free an attached data structures.
5971 * This is called from dm-raid
5974 bioset_exit(&mddev->bio_set);
5975 bioset_exit(&mddev->sync_set);
5978 EXPORT_SYMBOL_GPL(md_stop);
5980 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5985 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5987 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5988 md_wakeup_thread(mddev->thread);
5990 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5991 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5992 if (mddev->sync_thread)
5993 /* Thread might be blocked waiting for metadata update
5994 * which will now never happen */
5995 wake_up_process(mddev->sync_thread->tsk);
5997 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5999 mddev_unlock(mddev);
6000 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6002 wait_event(mddev->sb_wait,
6003 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6004 mddev_lock_nointr(mddev);
6006 mutex_lock(&mddev->open_mutex);
6007 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6008 mddev->sync_thread ||
6009 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6010 pr_warn("md: %s still in use.\n",mdname(mddev));
6012 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6013 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6014 md_wakeup_thread(mddev->thread);
6020 __md_stop_writes(mddev);
6026 set_disk_ro(mddev->gendisk, 1);
6027 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6028 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6029 md_wakeup_thread(mddev->thread);
6030 sysfs_notify_dirent_safe(mddev->sysfs_state);
6034 mutex_unlock(&mddev->open_mutex);
6039 * 0 - completely stop and dis-assemble array
6040 * 2 - stop but do not disassemble array
6042 static int do_md_stop(struct mddev *mddev, int mode,
6043 struct block_device *bdev)
6045 struct gendisk *disk = mddev->gendisk;
6046 struct md_rdev *rdev;
6049 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6051 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6052 md_wakeup_thread(mddev->thread);
6054 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6055 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6056 if (mddev->sync_thread)
6057 /* Thread might be blocked waiting for metadata update
6058 * which will now never happen */
6059 wake_up_process(mddev->sync_thread->tsk);
6061 mddev_unlock(mddev);
6062 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6063 !test_bit(MD_RECOVERY_RUNNING,
6064 &mddev->recovery)));
6065 mddev_lock_nointr(mddev);
6067 mutex_lock(&mddev->open_mutex);
6068 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6069 mddev->sysfs_active ||
6070 mddev->sync_thread ||
6071 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6072 pr_warn("md: %s still in use.\n",mdname(mddev));
6073 mutex_unlock(&mddev->open_mutex);
6075 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6076 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6077 md_wakeup_thread(mddev->thread);
6083 set_disk_ro(disk, 0);
6085 __md_stop_writes(mddev);
6087 mddev->queue->backing_dev_info->congested_fn = NULL;
6089 /* tell userspace to handle 'inactive' */
6090 sysfs_notify_dirent_safe(mddev->sysfs_state);
6092 rdev_for_each(rdev, mddev)
6093 if (rdev->raid_disk >= 0)
6094 sysfs_unlink_rdev(mddev, rdev);
6096 set_capacity(disk, 0);
6097 mutex_unlock(&mddev->open_mutex);
6099 revalidate_disk(disk);
6104 mutex_unlock(&mddev->open_mutex);
6106 * Free resources if final stop
6109 pr_info("md: %s stopped.\n", mdname(mddev));
6111 if (mddev->bitmap_info.file) {
6112 struct file *f = mddev->bitmap_info.file;
6113 spin_lock(&mddev->lock);
6114 mddev->bitmap_info.file = NULL;
6115 spin_unlock(&mddev->lock);
6118 mddev->bitmap_info.offset = 0;
6120 export_array(mddev);
6123 if (mddev->hold_active == UNTIL_STOP)
6124 mddev->hold_active = 0;
6126 md_new_event(mddev);
6127 sysfs_notify_dirent_safe(mddev->sysfs_state);
6132 static void autorun_array(struct mddev *mddev)
6134 struct md_rdev *rdev;
6137 if (list_empty(&mddev->disks))
6140 pr_info("md: running: ");
6142 rdev_for_each(rdev, mddev) {
6143 char b[BDEVNAME_SIZE];
6144 pr_cont("<%s>", bdevname(rdev->bdev,b));
6148 err = do_md_run(mddev);
6150 pr_warn("md: do_md_run() returned %d\n", err);
6151 do_md_stop(mddev, 0, NULL);
6156 * lets try to run arrays based on all disks that have arrived
6157 * until now. (those are in pending_raid_disks)
6159 * the method: pick the first pending disk, collect all disks with
6160 * the same UUID, remove all from the pending list and put them into
6161 * the 'same_array' list. Then order this list based on superblock
6162 * update time (freshest comes first), kick out 'old' disks and
6163 * compare superblocks. If everything's fine then run it.
6165 * If "unit" is allocated, then bump its reference count
6167 static void autorun_devices(int part)
6169 struct md_rdev *rdev0, *rdev, *tmp;
6170 struct mddev *mddev;
6171 char b[BDEVNAME_SIZE];
6173 pr_info("md: autorun ...\n");
6174 while (!list_empty(&pending_raid_disks)) {
6177 LIST_HEAD(candidates);
6178 rdev0 = list_entry(pending_raid_disks.next,
6179 struct md_rdev, same_set);
6181 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6182 INIT_LIST_HEAD(&candidates);
6183 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6184 if (super_90_load(rdev, rdev0, 0) >= 0) {
6185 pr_debug("md: adding %s ...\n",
6186 bdevname(rdev->bdev,b));
6187 list_move(&rdev->same_set, &candidates);
6190 * now we have a set of devices, with all of them having
6191 * mostly sane superblocks. It's time to allocate the
6195 dev = MKDEV(mdp_major,
6196 rdev0->preferred_minor << MdpMinorShift);
6197 unit = MINOR(dev) >> MdpMinorShift;
6199 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6202 if (rdev0->preferred_minor != unit) {
6203 pr_warn("md: unit number in %s is bad: %d\n",
6204 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6208 md_probe(dev, NULL, NULL);
6209 mddev = mddev_find(dev);
6210 if (!mddev || !mddev->gendisk) {
6215 if (mddev_lock(mddev))
6216 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6217 else if (mddev->raid_disks || mddev->major_version
6218 || !list_empty(&mddev->disks)) {
6219 pr_warn("md: %s already running, cannot run %s\n",
6220 mdname(mddev), bdevname(rdev0->bdev,b));
6221 mddev_unlock(mddev);
6223 pr_debug("md: created %s\n", mdname(mddev));
6224 mddev->persistent = 1;
6225 rdev_for_each_list(rdev, tmp, &candidates) {
6226 list_del_init(&rdev->same_set);
6227 if (bind_rdev_to_array(rdev, mddev))
6230 autorun_array(mddev);
6231 mddev_unlock(mddev);
6233 /* on success, candidates will be empty, on error
6236 rdev_for_each_list(rdev, tmp, &candidates) {
6237 list_del_init(&rdev->same_set);
6242 pr_info("md: ... autorun DONE.\n");
6244 #endif /* !MODULE */
6246 static int get_version(void __user *arg)
6250 ver.major = MD_MAJOR_VERSION;
6251 ver.minor = MD_MINOR_VERSION;
6252 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6254 if (copy_to_user(arg, &ver, sizeof(ver)))
6260 static int get_array_info(struct mddev *mddev, void __user *arg)
6262 mdu_array_info_t info;
6263 int nr,working,insync,failed,spare;
6264 struct md_rdev *rdev;
6266 nr = working = insync = failed = spare = 0;
6268 rdev_for_each_rcu(rdev, mddev) {
6270 if (test_bit(Faulty, &rdev->flags))
6274 if (test_bit(In_sync, &rdev->flags))
6276 else if (test_bit(Journal, &rdev->flags))
6277 /* TODO: add journal count to md_u.h */
6285 info.major_version = mddev->major_version;
6286 info.minor_version = mddev->minor_version;
6287 info.patch_version = MD_PATCHLEVEL_VERSION;
6288 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6289 info.level = mddev->level;
6290 info.size = mddev->dev_sectors / 2;
6291 if (info.size != mddev->dev_sectors / 2) /* overflow */
6294 info.raid_disks = mddev->raid_disks;
6295 info.md_minor = mddev->md_minor;
6296 info.not_persistent= !mddev->persistent;
6298 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6301 info.state = (1<<MD_SB_CLEAN);
6302 if (mddev->bitmap && mddev->bitmap_info.offset)
6303 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6304 if (mddev_is_clustered(mddev))
6305 info.state |= (1<<MD_SB_CLUSTERED);
6306 info.active_disks = insync;
6307 info.working_disks = working;
6308 info.failed_disks = failed;
6309 info.spare_disks = spare;
6311 info.layout = mddev->layout;
6312 info.chunk_size = mddev->chunk_sectors << 9;
6314 if (copy_to_user(arg, &info, sizeof(info)))
6320 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6322 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6326 file = kzalloc(sizeof(*file), GFP_NOIO);
6331 spin_lock(&mddev->lock);
6332 /* bitmap enabled */
6333 if (mddev->bitmap_info.file) {
6334 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6335 sizeof(file->pathname));
6339 memmove(file->pathname, ptr,
6340 sizeof(file->pathname)-(ptr-file->pathname));
6342 spin_unlock(&mddev->lock);
6345 copy_to_user(arg, file, sizeof(*file)))
6352 static int get_disk_info(struct mddev *mddev, void __user * arg)
6354 mdu_disk_info_t info;
6355 struct md_rdev *rdev;
6357 if (copy_from_user(&info, arg, sizeof(info)))
6361 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6363 info.major = MAJOR(rdev->bdev->bd_dev);
6364 info.minor = MINOR(rdev->bdev->bd_dev);
6365 info.raid_disk = rdev->raid_disk;
6367 if (test_bit(Faulty, &rdev->flags))
6368 info.state |= (1<<MD_DISK_FAULTY);
6369 else if (test_bit(In_sync, &rdev->flags)) {
6370 info.state |= (1<<MD_DISK_ACTIVE);
6371 info.state |= (1<<MD_DISK_SYNC);
6373 if (test_bit(Journal, &rdev->flags))
6374 info.state |= (1<<MD_DISK_JOURNAL);
6375 if (test_bit(WriteMostly, &rdev->flags))
6376 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6377 if (test_bit(FailFast, &rdev->flags))
6378 info.state |= (1<<MD_DISK_FAILFAST);
6380 info.major = info.minor = 0;
6381 info.raid_disk = -1;
6382 info.state = (1<<MD_DISK_REMOVED);
6386 if (copy_to_user(arg, &info, sizeof(info)))
6392 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6394 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6395 struct md_rdev *rdev;
6396 dev_t dev = MKDEV(info->major,info->minor);
6398 if (mddev_is_clustered(mddev) &&
6399 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6400 pr_warn("%s: Cannot add to clustered mddev.\n",
6405 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6408 if (!mddev->raid_disks) {
6410 /* expecting a device which has a superblock */
6411 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6413 pr_warn("md: md_import_device returned %ld\n",
6415 return PTR_ERR(rdev);
6417 if (!list_empty(&mddev->disks)) {
6418 struct md_rdev *rdev0
6419 = list_entry(mddev->disks.next,
6420 struct md_rdev, same_set);
6421 err = super_types[mddev->major_version]
6422 .load_super(rdev, rdev0, mddev->minor_version);
6424 pr_warn("md: %s has different UUID to %s\n",
6425 bdevname(rdev->bdev,b),
6426 bdevname(rdev0->bdev,b2));
6431 err = bind_rdev_to_array(rdev, mddev);
6438 * add_new_disk can be used once the array is assembled
6439 * to add "hot spares". They must already have a superblock
6444 if (!mddev->pers->hot_add_disk) {
6445 pr_warn("%s: personality does not support diskops!\n",
6449 if (mddev->persistent)
6450 rdev = md_import_device(dev, mddev->major_version,
6451 mddev->minor_version);
6453 rdev = md_import_device(dev, -1, -1);
6455 pr_warn("md: md_import_device returned %ld\n",
6457 return PTR_ERR(rdev);
6459 /* set saved_raid_disk if appropriate */
6460 if (!mddev->persistent) {
6461 if (info->state & (1<<MD_DISK_SYNC) &&
6462 info->raid_disk < mddev->raid_disks) {
6463 rdev->raid_disk = info->raid_disk;
6464 set_bit(In_sync, &rdev->flags);
6465 clear_bit(Bitmap_sync, &rdev->flags);
6467 rdev->raid_disk = -1;
6468 rdev->saved_raid_disk = rdev->raid_disk;
6470 super_types[mddev->major_version].
6471 validate_super(mddev, rdev);
6472 if ((info->state & (1<<MD_DISK_SYNC)) &&
6473 rdev->raid_disk != info->raid_disk) {
6474 /* This was a hot-add request, but events doesn't
6475 * match, so reject it.
6481 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6482 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6483 set_bit(WriteMostly, &rdev->flags);
6485 clear_bit(WriteMostly, &rdev->flags);
6486 if (info->state & (1<<MD_DISK_FAILFAST))
6487 set_bit(FailFast, &rdev->flags);
6489 clear_bit(FailFast, &rdev->flags);
6491 if (info->state & (1<<MD_DISK_JOURNAL)) {
6492 struct md_rdev *rdev2;
6493 bool has_journal = false;
6495 /* make sure no existing journal disk */
6496 rdev_for_each(rdev2, mddev) {
6497 if (test_bit(Journal, &rdev2->flags)) {
6502 if (has_journal || mddev->bitmap) {
6506 set_bit(Journal, &rdev->flags);
6509 * check whether the device shows up in other nodes
6511 if (mddev_is_clustered(mddev)) {
6512 if (info->state & (1 << MD_DISK_CANDIDATE))
6513 set_bit(Candidate, &rdev->flags);
6514 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6515 /* --add initiated by this node */
6516 err = md_cluster_ops->add_new_disk(mddev, rdev);
6524 rdev->raid_disk = -1;
6525 err = bind_rdev_to_array(rdev, mddev);
6530 if (mddev_is_clustered(mddev)) {
6531 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6533 err = md_cluster_ops->new_disk_ack(mddev,
6536 md_kick_rdev_from_array(rdev);
6540 md_cluster_ops->add_new_disk_cancel(mddev);
6542 err = add_bound_rdev(rdev);
6546 err = add_bound_rdev(rdev);
6551 /* otherwise, add_new_disk is only allowed
6552 * for major_version==0 superblocks
6554 if (mddev->major_version != 0) {
6555 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6559 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6561 rdev = md_import_device(dev, -1, 0);
6563 pr_warn("md: error, md_import_device() returned %ld\n",
6565 return PTR_ERR(rdev);
6567 rdev->desc_nr = info->number;
6568 if (info->raid_disk < mddev->raid_disks)
6569 rdev->raid_disk = info->raid_disk;
6571 rdev->raid_disk = -1;
6573 if (rdev->raid_disk < mddev->raid_disks)
6574 if (info->state & (1<<MD_DISK_SYNC))
6575 set_bit(In_sync, &rdev->flags);
6577 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6578 set_bit(WriteMostly, &rdev->flags);
6579 if (info->state & (1<<MD_DISK_FAILFAST))
6580 set_bit(FailFast, &rdev->flags);
6582 if (!mddev->persistent) {
6583 pr_debug("md: nonpersistent superblock ...\n");
6584 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6586 rdev->sb_start = calc_dev_sboffset(rdev);
6587 rdev->sectors = rdev->sb_start;
6589 err = bind_rdev_to_array(rdev, mddev);
6599 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6601 char b[BDEVNAME_SIZE];
6602 struct md_rdev *rdev;
6607 rdev = find_rdev(mddev, dev);
6611 if (rdev->raid_disk < 0)
6614 clear_bit(Blocked, &rdev->flags);
6615 remove_and_add_spares(mddev, rdev);
6617 if (rdev->raid_disk >= 0)
6621 if (mddev_is_clustered(mddev))
6622 md_cluster_ops->remove_disk(mddev, rdev);
6624 md_kick_rdev_from_array(rdev);
6625 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6627 md_wakeup_thread(mddev->thread);
6629 md_update_sb(mddev, 1);
6630 md_new_event(mddev);
6634 pr_debug("md: cannot remove active disk %s from %s ...\n",
6635 bdevname(rdev->bdev,b), mdname(mddev));
6639 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6641 char b[BDEVNAME_SIZE];
6643 struct md_rdev *rdev;
6648 if (mddev->major_version != 0) {
6649 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6653 if (!mddev->pers->hot_add_disk) {
6654 pr_warn("%s: personality does not support diskops!\n",
6659 rdev = md_import_device(dev, -1, 0);
6661 pr_warn("md: error, md_import_device() returned %ld\n",
6666 if (mddev->persistent)
6667 rdev->sb_start = calc_dev_sboffset(rdev);
6669 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6671 rdev->sectors = rdev->sb_start;
6673 if (test_bit(Faulty, &rdev->flags)) {
6674 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6675 bdevname(rdev->bdev,b), mdname(mddev));
6680 clear_bit(In_sync, &rdev->flags);
6682 rdev->saved_raid_disk = -1;
6683 err = bind_rdev_to_array(rdev, mddev);
6688 * The rest should better be atomic, we can have disk failures
6689 * noticed in interrupt contexts ...
6692 rdev->raid_disk = -1;
6694 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6696 md_update_sb(mddev, 1);
6698 * Kick recovery, maybe this spare has to be added to the
6699 * array immediately.
6701 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6702 md_wakeup_thread(mddev->thread);
6703 md_new_event(mddev);
6711 static int set_bitmap_file(struct mddev *mddev, int fd)
6716 if (!mddev->pers->quiesce || !mddev->thread)
6718 if (mddev->recovery || mddev->sync_thread)
6720 /* we should be able to change the bitmap.. */
6724 struct inode *inode;
6727 if (mddev->bitmap || mddev->bitmap_info.file)
6728 return -EEXIST; /* cannot add when bitmap is present */
6732 pr_warn("%s: error: failed to get bitmap file\n",
6737 inode = f->f_mapping->host;
6738 if (!S_ISREG(inode->i_mode)) {
6739 pr_warn("%s: error: bitmap file must be a regular file\n",
6742 } else if (!(f->f_mode & FMODE_WRITE)) {
6743 pr_warn("%s: error: bitmap file must open for write\n",
6746 } else if (atomic_read(&inode->i_writecount) != 1) {
6747 pr_warn("%s: error: bitmap file is already in use\n",
6755 mddev->bitmap_info.file = f;
6756 mddev->bitmap_info.offset = 0; /* file overrides offset */
6757 } else if (mddev->bitmap == NULL)
6758 return -ENOENT; /* cannot remove what isn't there */
6762 struct bitmap *bitmap;
6764 bitmap = md_bitmap_create(mddev, -1);
6765 mddev_suspend(mddev);
6766 if (!IS_ERR(bitmap)) {
6767 mddev->bitmap = bitmap;
6768 err = md_bitmap_load(mddev);
6770 err = PTR_ERR(bitmap);
6772 md_bitmap_destroy(mddev);
6775 mddev_resume(mddev);
6776 } else if (fd < 0) {
6777 mddev_suspend(mddev);
6778 md_bitmap_destroy(mddev);
6779 mddev_resume(mddev);
6783 struct file *f = mddev->bitmap_info.file;
6785 spin_lock(&mddev->lock);
6786 mddev->bitmap_info.file = NULL;
6787 spin_unlock(&mddev->lock);
6796 * set_array_info is used two different ways
6797 * The original usage is when creating a new array.
6798 * In this usage, raid_disks is > 0 and it together with
6799 * level, size, not_persistent,layout,chunksize determine the
6800 * shape of the array.
6801 * This will always create an array with a type-0.90.0 superblock.
6802 * The newer usage is when assembling an array.
6803 * In this case raid_disks will be 0, and the major_version field is
6804 * use to determine which style super-blocks are to be found on the devices.
6805 * The minor and patch _version numbers are also kept incase the
6806 * super_block handler wishes to interpret them.
6808 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6811 if (info->raid_disks == 0) {
6812 /* just setting version number for superblock loading */
6813 if (info->major_version < 0 ||
6814 info->major_version >= ARRAY_SIZE(super_types) ||
6815 super_types[info->major_version].name == NULL) {
6816 /* maybe try to auto-load a module? */
6817 pr_warn("md: superblock version %d not known\n",
6818 info->major_version);
6821 mddev->major_version = info->major_version;
6822 mddev->minor_version = info->minor_version;
6823 mddev->patch_version = info->patch_version;
6824 mddev->persistent = !info->not_persistent;
6825 /* ensure mddev_put doesn't delete this now that there
6826 * is some minimal configuration.
6828 mddev->ctime = ktime_get_real_seconds();
6831 mddev->major_version = MD_MAJOR_VERSION;
6832 mddev->minor_version = MD_MINOR_VERSION;
6833 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6834 mddev->ctime = ktime_get_real_seconds();
6836 mddev->level = info->level;
6837 mddev->clevel[0] = 0;
6838 mddev->dev_sectors = 2 * (sector_t)info->size;
6839 mddev->raid_disks = info->raid_disks;
6840 /* don't set md_minor, it is determined by which /dev/md* was
6843 if (info->state & (1<<MD_SB_CLEAN))
6844 mddev->recovery_cp = MaxSector;
6846 mddev->recovery_cp = 0;
6847 mddev->persistent = ! info->not_persistent;
6848 mddev->external = 0;
6850 mddev->layout = info->layout;
6851 mddev->chunk_sectors = info->chunk_size >> 9;
6853 if (mddev->persistent) {
6854 mddev->max_disks = MD_SB_DISKS;
6856 mddev->sb_flags = 0;
6858 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6860 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6861 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6862 mddev->bitmap_info.offset = 0;
6864 mddev->reshape_position = MaxSector;
6867 * Generate a 128 bit UUID
6869 get_random_bytes(mddev->uuid, 16);
6871 mddev->new_level = mddev->level;
6872 mddev->new_chunk_sectors = mddev->chunk_sectors;
6873 mddev->new_layout = mddev->layout;
6874 mddev->delta_disks = 0;
6875 mddev->reshape_backwards = 0;
6880 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6882 lockdep_assert_held(&mddev->reconfig_mutex);
6884 if (mddev->external_size)
6887 mddev->array_sectors = array_sectors;
6889 EXPORT_SYMBOL(md_set_array_sectors);
6891 static int update_size(struct mddev *mddev, sector_t num_sectors)
6893 struct md_rdev *rdev;
6895 int fit = (num_sectors == 0);
6896 sector_t old_dev_sectors = mddev->dev_sectors;
6898 if (mddev->pers->resize == NULL)
6900 /* The "num_sectors" is the number of sectors of each device that
6901 * is used. This can only make sense for arrays with redundancy.
6902 * linear and raid0 always use whatever space is available. We can only
6903 * consider changing this number if no resync or reconstruction is
6904 * happening, and if the new size is acceptable. It must fit before the
6905 * sb_start or, if that is <data_offset, it must fit before the size
6906 * of each device. If num_sectors is zero, we find the largest size
6909 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6915 rdev_for_each(rdev, mddev) {
6916 sector_t avail = rdev->sectors;
6918 if (fit && (num_sectors == 0 || num_sectors > avail))
6919 num_sectors = avail;
6920 if (avail < num_sectors)
6923 rv = mddev->pers->resize(mddev, num_sectors);
6925 if (mddev_is_clustered(mddev))
6926 md_cluster_ops->update_size(mddev, old_dev_sectors);
6927 else if (mddev->queue) {
6928 set_capacity(mddev->gendisk, mddev->array_sectors);
6929 revalidate_disk(mddev->gendisk);
6935 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6938 struct md_rdev *rdev;
6939 /* change the number of raid disks */
6940 if (mddev->pers->check_reshape == NULL)
6944 if (raid_disks <= 0 ||
6945 (mddev->max_disks && raid_disks >= mddev->max_disks))
6947 if (mddev->sync_thread ||
6948 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6949 mddev->reshape_position != MaxSector)
6952 rdev_for_each(rdev, mddev) {
6953 if (mddev->raid_disks < raid_disks &&
6954 rdev->data_offset < rdev->new_data_offset)
6956 if (mddev->raid_disks > raid_disks &&
6957 rdev->data_offset > rdev->new_data_offset)
6961 mddev->delta_disks = raid_disks - mddev->raid_disks;
6962 if (mddev->delta_disks < 0)
6963 mddev->reshape_backwards = 1;
6964 else if (mddev->delta_disks > 0)
6965 mddev->reshape_backwards = 0;
6967 rv = mddev->pers->check_reshape(mddev);
6969 mddev->delta_disks = 0;
6970 mddev->reshape_backwards = 0;
6976 * update_array_info is used to change the configuration of an
6978 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6979 * fields in the info are checked against the array.
6980 * Any differences that cannot be handled will cause an error.
6981 * Normally, only one change can be managed at a time.
6983 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6989 /* calculate expected state,ignoring low bits */
6990 if (mddev->bitmap && mddev->bitmap_info.offset)
6991 state |= (1 << MD_SB_BITMAP_PRESENT);
6993 if (mddev->major_version != info->major_version ||
6994 mddev->minor_version != info->minor_version ||
6995 /* mddev->patch_version != info->patch_version || */
6996 mddev->ctime != info->ctime ||
6997 mddev->level != info->level ||
6998 /* mddev->layout != info->layout || */
6999 mddev->persistent != !info->not_persistent ||
7000 mddev->chunk_sectors != info->chunk_size >> 9 ||
7001 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7002 ((state^info->state) & 0xfffffe00)
7005 /* Check there is only one change */
7006 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7008 if (mddev->raid_disks != info->raid_disks)
7010 if (mddev->layout != info->layout)
7012 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7019 if (mddev->layout != info->layout) {
7021 * we don't need to do anything at the md level, the
7022 * personality will take care of it all.
7024 if (mddev->pers->check_reshape == NULL)
7027 mddev->new_layout = info->layout;
7028 rv = mddev->pers->check_reshape(mddev);
7030 mddev->new_layout = mddev->layout;
7034 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7035 rv = update_size(mddev, (sector_t)info->size * 2);
7037 if (mddev->raid_disks != info->raid_disks)
7038 rv = update_raid_disks(mddev, info->raid_disks);
7040 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7041 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7045 if (mddev->recovery || mddev->sync_thread) {
7049 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7050 struct bitmap *bitmap;
7051 /* add the bitmap */
7052 if (mddev->bitmap) {
7056 if (mddev->bitmap_info.default_offset == 0) {
7060 mddev->bitmap_info.offset =
7061 mddev->bitmap_info.default_offset;
7062 mddev->bitmap_info.space =
7063 mddev->bitmap_info.default_space;
7064 bitmap = md_bitmap_create(mddev, -1);
7065 mddev_suspend(mddev);
7066 if (!IS_ERR(bitmap)) {
7067 mddev->bitmap = bitmap;
7068 rv = md_bitmap_load(mddev);
7070 rv = PTR_ERR(bitmap);
7072 md_bitmap_destroy(mddev);
7073 mddev_resume(mddev);
7075 /* remove the bitmap */
7076 if (!mddev->bitmap) {
7080 if (mddev->bitmap->storage.file) {
7084 if (mddev->bitmap_info.nodes) {
7085 /* hold PW on all the bitmap lock */
7086 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7087 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7089 md_cluster_ops->unlock_all_bitmaps(mddev);
7093 mddev->bitmap_info.nodes = 0;
7094 md_cluster_ops->leave(mddev);
7096 mddev_suspend(mddev);
7097 md_bitmap_destroy(mddev);
7098 mddev_resume(mddev);
7099 mddev->bitmap_info.offset = 0;
7102 md_update_sb(mddev, 1);
7108 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7110 struct md_rdev *rdev;
7113 if (mddev->pers == NULL)
7117 rdev = md_find_rdev_rcu(mddev, dev);
7121 md_error(mddev, rdev);
7122 if (!test_bit(Faulty, &rdev->flags))
7130 * We have a problem here : there is no easy way to give a CHS
7131 * virtual geometry. We currently pretend that we have a 2 heads
7132 * 4 sectors (with a BIG number of cylinders...). This drives
7133 * dosfs just mad... ;-)
7135 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7137 struct mddev *mddev = bdev->bd_disk->private_data;
7141 geo->cylinders = mddev->array_sectors / 8;
7145 static inline bool md_ioctl_valid(unsigned int cmd)
7150 case GET_ARRAY_INFO:
7151 case GET_BITMAP_FILE:
7154 case HOT_REMOVE_DISK:
7157 case RESTART_ARRAY_RW:
7159 case SET_ARRAY_INFO:
7160 case SET_BITMAP_FILE:
7161 case SET_DISK_FAULTY:
7164 case CLUSTERED_DISK_NACK:
7171 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7172 unsigned int cmd, unsigned long arg)
7175 void __user *argp = (void __user *)arg;
7176 struct mddev *mddev = NULL;
7178 bool did_set_md_closing = false;
7180 if (!md_ioctl_valid(cmd))
7185 case GET_ARRAY_INFO:
7189 if (!capable(CAP_SYS_ADMIN))
7194 * Commands dealing with the RAID driver but not any
7199 err = get_version(argp);
7205 autostart_arrays(arg);
7212 * Commands creating/starting a new array:
7215 mddev = bdev->bd_disk->private_data;
7222 /* Some actions do not requires the mutex */
7224 case GET_ARRAY_INFO:
7225 if (!mddev->raid_disks && !mddev->external)
7228 err = get_array_info(mddev, argp);
7232 if (!mddev->raid_disks && !mddev->external)
7235 err = get_disk_info(mddev, argp);
7238 case SET_DISK_FAULTY:
7239 err = set_disk_faulty(mddev, new_decode_dev(arg));
7242 case GET_BITMAP_FILE:
7243 err = get_bitmap_file(mddev, argp);
7248 if (cmd == ADD_NEW_DISK)
7249 /* need to ensure md_delayed_delete() has completed */
7250 flush_workqueue(md_misc_wq);
7252 if (cmd == HOT_REMOVE_DISK)
7253 /* need to ensure recovery thread has run */
7254 wait_event_interruptible_timeout(mddev->sb_wait,
7255 !test_bit(MD_RECOVERY_NEEDED,
7257 msecs_to_jiffies(5000));
7258 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7259 /* Need to flush page cache, and ensure no-one else opens
7262 mutex_lock(&mddev->open_mutex);
7263 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7264 mutex_unlock(&mddev->open_mutex);
7268 WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
7269 set_bit(MD_CLOSING, &mddev->flags);
7270 did_set_md_closing = true;
7271 mutex_unlock(&mddev->open_mutex);
7272 sync_blockdev(bdev);
7274 err = mddev_lock(mddev);
7276 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7281 if (cmd == SET_ARRAY_INFO) {
7282 mdu_array_info_t info;
7284 memset(&info, 0, sizeof(info));
7285 else if (copy_from_user(&info, argp, sizeof(info))) {
7290 err = update_array_info(mddev, &info);
7292 pr_warn("md: couldn't update array info. %d\n", err);
7297 if (!list_empty(&mddev->disks)) {
7298 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7302 if (mddev->raid_disks) {
7303 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7307 err = set_array_info(mddev, &info);
7309 pr_warn("md: couldn't set array info. %d\n", err);
7316 * Commands querying/configuring an existing array:
7318 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7319 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7320 if ((!mddev->raid_disks && !mddev->external)
7321 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7322 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7323 && cmd != GET_BITMAP_FILE) {
7329 * Commands even a read-only array can execute:
7332 case RESTART_ARRAY_RW:
7333 err = restart_array(mddev);
7337 err = do_md_stop(mddev, 0, bdev);
7341 err = md_set_readonly(mddev, bdev);
7344 case HOT_REMOVE_DISK:
7345 err = hot_remove_disk(mddev, new_decode_dev(arg));
7349 /* We can support ADD_NEW_DISK on read-only arrays
7350 * only if we are re-adding a preexisting device.
7351 * So require mddev->pers and MD_DISK_SYNC.
7354 mdu_disk_info_t info;
7355 if (copy_from_user(&info, argp, sizeof(info)))
7357 else if (!(info.state & (1<<MD_DISK_SYNC)))
7358 /* Need to clear read-only for this */
7361 err = add_new_disk(mddev, &info);
7367 if (get_user(ro, (int __user *)(arg))) {
7373 /* if the bdev is going readonly the value of mddev->ro
7374 * does not matter, no writes are coming
7379 /* are we are already prepared for writes? */
7383 /* transitioning to readauto need only happen for
7384 * arrays that call md_write_start
7387 err = restart_array(mddev);
7390 set_disk_ro(mddev->gendisk, 0);
7397 * The remaining ioctls are changing the state of the
7398 * superblock, so we do not allow them on read-only arrays.
7400 if (mddev->ro && mddev->pers) {
7401 if (mddev->ro == 2) {
7403 sysfs_notify_dirent_safe(mddev->sysfs_state);
7404 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7405 /* mddev_unlock will wake thread */
7406 /* If a device failed while we were read-only, we
7407 * need to make sure the metadata is updated now.
7409 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7410 mddev_unlock(mddev);
7411 wait_event(mddev->sb_wait,
7412 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7413 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7414 mddev_lock_nointr(mddev);
7425 mdu_disk_info_t info;
7426 if (copy_from_user(&info, argp, sizeof(info)))
7429 err = add_new_disk(mddev, &info);
7433 case CLUSTERED_DISK_NACK:
7434 if (mddev_is_clustered(mddev))
7435 md_cluster_ops->new_disk_ack(mddev, false);
7441 err = hot_add_disk(mddev, new_decode_dev(arg));
7445 err = do_md_run(mddev);
7448 case SET_BITMAP_FILE:
7449 err = set_bitmap_file(mddev, (int)arg);
7458 if (mddev->hold_active == UNTIL_IOCTL &&
7460 mddev->hold_active = 0;
7461 mddev_unlock(mddev);
7463 if(did_set_md_closing)
7464 clear_bit(MD_CLOSING, &mddev->flags);
7467 #ifdef CONFIG_COMPAT
7468 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7469 unsigned int cmd, unsigned long arg)
7472 case HOT_REMOVE_DISK:
7474 case SET_DISK_FAULTY:
7475 case SET_BITMAP_FILE:
7476 /* These take in integer arg, do not convert */
7479 arg = (unsigned long)compat_ptr(arg);
7483 return md_ioctl(bdev, mode, cmd, arg);
7485 #endif /* CONFIG_COMPAT */
7487 static int md_open(struct block_device *bdev, fmode_t mode)
7490 * Succeed if we can lock the mddev, which confirms that
7491 * it isn't being stopped right now.
7493 struct mddev *mddev = mddev_find(bdev->bd_dev);
7499 if (mddev->gendisk != bdev->bd_disk) {
7500 /* we are racing with mddev_put which is discarding this
7504 /* Wait until bdev->bd_disk is definitely gone */
7505 flush_workqueue(md_misc_wq);
7506 /* Then retry the open from the top */
7507 return -ERESTARTSYS;
7509 BUG_ON(mddev != bdev->bd_disk->private_data);
7511 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7514 if (test_bit(MD_CLOSING, &mddev->flags)) {
7515 mutex_unlock(&mddev->open_mutex);
7521 atomic_inc(&mddev->openers);
7522 mutex_unlock(&mddev->open_mutex);
7524 check_disk_change(bdev);
7531 static void md_release(struct gendisk *disk, fmode_t mode)
7533 struct mddev *mddev = disk->private_data;
7536 atomic_dec(&mddev->openers);
7540 static int md_media_changed(struct gendisk *disk)
7542 struct mddev *mddev = disk->private_data;
7544 return mddev->changed;
7547 static int md_revalidate(struct gendisk *disk)
7549 struct mddev *mddev = disk->private_data;
7554 static const struct block_device_operations md_fops =
7556 .owner = THIS_MODULE,
7558 .release = md_release,
7560 #ifdef CONFIG_COMPAT
7561 .compat_ioctl = md_compat_ioctl,
7563 .getgeo = md_getgeo,
7564 .media_changed = md_media_changed,
7565 .revalidate_disk= md_revalidate,
7568 static int md_thread(void *arg)
7570 struct md_thread *thread = arg;
7573 * md_thread is a 'system-thread', it's priority should be very
7574 * high. We avoid resource deadlocks individually in each
7575 * raid personality. (RAID5 does preallocation) We also use RR and
7576 * the very same RT priority as kswapd, thus we will never get
7577 * into a priority inversion deadlock.
7579 * we definitely have to have equal or higher priority than
7580 * bdflush, otherwise bdflush will deadlock if there are too
7581 * many dirty RAID5 blocks.
7584 allow_signal(SIGKILL);
7585 while (!kthread_should_stop()) {
7587 /* We need to wait INTERRUPTIBLE so that
7588 * we don't add to the load-average.
7589 * That means we need to be sure no signals are
7592 if (signal_pending(current))
7593 flush_signals(current);
7595 wait_event_interruptible_timeout
7597 test_bit(THREAD_WAKEUP, &thread->flags)
7598 || kthread_should_stop() || kthread_should_park(),
7601 clear_bit(THREAD_WAKEUP, &thread->flags);
7602 if (kthread_should_park())
7604 if (!kthread_should_stop())
7605 thread->run(thread);
7611 void md_wakeup_thread(struct md_thread *thread)
7614 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7615 set_bit(THREAD_WAKEUP, &thread->flags);
7616 wake_up(&thread->wqueue);
7619 EXPORT_SYMBOL(md_wakeup_thread);
7621 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7622 struct mddev *mddev, const char *name)
7624 struct md_thread *thread;
7626 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7630 init_waitqueue_head(&thread->wqueue);
7633 thread->mddev = mddev;
7634 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7635 thread->tsk = kthread_run(md_thread, thread,
7637 mdname(thread->mddev),
7639 if (IS_ERR(thread->tsk)) {
7645 EXPORT_SYMBOL(md_register_thread);
7647 void md_unregister_thread(struct md_thread **threadp)
7649 struct md_thread *thread = *threadp;
7652 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7653 /* Locking ensures that mddev_unlock does not wake_up a
7654 * non-existent thread
7656 spin_lock(&pers_lock);
7658 spin_unlock(&pers_lock);
7660 kthread_stop(thread->tsk);
7663 EXPORT_SYMBOL(md_unregister_thread);
7665 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7667 if (!rdev || test_bit(Faulty, &rdev->flags))
7670 if (!mddev->pers || !mddev->pers->error_handler)
7672 mddev->pers->error_handler(mddev,rdev);
7673 if (mddev->degraded)
7674 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7675 sysfs_notify_dirent_safe(rdev->sysfs_state);
7676 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7677 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7678 md_wakeup_thread(mddev->thread);
7679 if (mddev->event_work.func)
7680 queue_work(md_misc_wq, &mddev->event_work);
7681 md_new_event(mddev);
7683 EXPORT_SYMBOL(md_error);
7685 /* seq_file implementation /proc/mdstat */
7687 static void status_unused(struct seq_file *seq)
7690 struct md_rdev *rdev;
7692 seq_printf(seq, "unused devices: ");
7694 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7695 char b[BDEVNAME_SIZE];
7697 seq_printf(seq, "%s ",
7698 bdevname(rdev->bdev,b));
7701 seq_printf(seq, "<none>");
7703 seq_printf(seq, "\n");
7706 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7708 sector_t max_sectors, resync, res;
7709 unsigned long dt, db = 0;
7710 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7711 int scale, recovery_active;
7712 unsigned int per_milli;
7714 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7715 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7716 max_sectors = mddev->resync_max_sectors;
7718 max_sectors = mddev->dev_sectors;
7720 resync = mddev->curr_resync;
7722 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7723 /* Still cleaning up */
7724 resync = max_sectors;
7725 } else if (resync > max_sectors)
7726 resync = max_sectors;
7728 resync -= atomic_read(&mddev->recovery_active);
7731 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
7732 struct md_rdev *rdev;
7734 rdev_for_each(rdev, mddev)
7735 if (rdev->raid_disk >= 0 &&
7736 !test_bit(Faulty, &rdev->flags) &&
7737 rdev->recovery_offset != MaxSector &&
7738 rdev->recovery_offset) {
7739 seq_printf(seq, "\trecover=REMOTE");
7742 if (mddev->reshape_position != MaxSector)
7743 seq_printf(seq, "\treshape=REMOTE");
7745 seq_printf(seq, "\tresync=REMOTE");
7748 if (mddev->recovery_cp < MaxSector) {
7749 seq_printf(seq, "\tresync=PENDING");
7755 seq_printf(seq, "\tresync=DELAYED");
7759 WARN_ON(max_sectors == 0);
7760 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7761 * in a sector_t, and (max_sectors>>scale) will fit in a
7762 * u32, as those are the requirements for sector_div.
7763 * Thus 'scale' must be at least 10
7766 if (sizeof(sector_t) > sizeof(unsigned long)) {
7767 while ( max_sectors/2 > (1ULL<<(scale+32)))
7770 res = (resync>>scale)*1000;
7771 sector_div(res, (u32)((max_sectors>>scale)+1));
7775 int i, x = per_milli/50, y = 20-x;
7776 seq_printf(seq, "[");
7777 for (i = 0; i < x; i++)
7778 seq_printf(seq, "=");
7779 seq_printf(seq, ">");
7780 for (i = 0; i < y; i++)
7781 seq_printf(seq, ".");
7782 seq_printf(seq, "] ");
7784 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7785 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7787 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7789 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7790 "resync" : "recovery"))),
7791 per_milli/10, per_milli % 10,
7792 (unsigned long long) resync/2,
7793 (unsigned long long) max_sectors/2);
7796 * dt: time from mark until now
7797 * db: blocks written from mark until now
7798 * rt: remaining time
7800 * rt is a sector_t, which is always 64bit now. We are keeping
7801 * the original algorithm, but it is not really necessary.
7803 * Original algorithm:
7804 * So we divide before multiply in case it is 32bit and close
7806 * We scale the divisor (db) by 32 to avoid losing precision
7807 * near the end of resync when the number of remaining sectors
7809 * We then divide rt by 32 after multiplying by db to compensate.
7810 * The '+1' avoids division by zero if db is very small.
7812 dt = ((jiffies - mddev->resync_mark) / HZ);
7815 curr_mark_cnt = mddev->curr_mark_cnt;
7816 recovery_active = atomic_read(&mddev->recovery_active);
7817 resync_mark_cnt = mddev->resync_mark_cnt;
7819 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7820 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7822 rt = max_sectors - resync; /* number of remaining sectors */
7823 rt = div64_u64(rt, db/32+1);
7827 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7828 ((unsigned long)rt % 60)/6);
7830 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7834 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7836 struct list_head *tmp;
7838 struct mddev *mddev;
7846 spin_lock(&all_mddevs_lock);
7847 list_for_each(tmp,&all_mddevs)
7849 mddev = list_entry(tmp, struct mddev, all_mddevs);
7851 spin_unlock(&all_mddevs_lock);
7854 spin_unlock(&all_mddevs_lock);
7856 return (void*)2;/* tail */
7860 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7862 struct list_head *tmp;
7863 struct mddev *next_mddev, *mddev = v;
7869 spin_lock(&all_mddevs_lock);
7871 tmp = all_mddevs.next;
7873 tmp = mddev->all_mddevs.next;
7874 if (tmp != &all_mddevs)
7875 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7877 next_mddev = (void*)2;
7880 spin_unlock(&all_mddevs_lock);
7888 static void md_seq_stop(struct seq_file *seq, void *v)
7890 struct mddev *mddev = v;
7892 if (mddev && v != (void*)1 && v != (void*)2)
7896 static int md_seq_show(struct seq_file *seq, void *v)
7898 struct mddev *mddev = v;
7900 struct md_rdev *rdev;
7902 if (v == (void*)1) {
7903 struct md_personality *pers;
7904 seq_printf(seq, "Personalities : ");
7905 spin_lock(&pers_lock);
7906 list_for_each_entry(pers, &pers_list, list)
7907 seq_printf(seq, "[%s] ", pers->name);
7909 spin_unlock(&pers_lock);
7910 seq_printf(seq, "\n");
7911 seq->poll_event = atomic_read(&md_event_count);
7914 if (v == (void*)2) {
7919 spin_lock(&mddev->lock);
7920 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7921 seq_printf(seq, "%s : %sactive", mdname(mddev),
7922 mddev->pers ? "" : "in");
7925 seq_printf(seq, " (read-only)");
7927 seq_printf(seq, " (auto-read-only)");
7928 seq_printf(seq, " %s", mddev->pers->name);
7933 rdev_for_each_rcu(rdev, mddev) {
7934 char b[BDEVNAME_SIZE];
7935 seq_printf(seq, " %s[%d]",
7936 bdevname(rdev->bdev,b), rdev->desc_nr);
7937 if (test_bit(WriteMostly, &rdev->flags))
7938 seq_printf(seq, "(W)");
7939 if (test_bit(Journal, &rdev->flags))
7940 seq_printf(seq, "(J)");
7941 if (test_bit(Faulty, &rdev->flags)) {
7942 seq_printf(seq, "(F)");
7945 if (rdev->raid_disk < 0)
7946 seq_printf(seq, "(S)"); /* spare */
7947 if (test_bit(Replacement, &rdev->flags))
7948 seq_printf(seq, "(R)");
7949 sectors += rdev->sectors;
7953 if (!list_empty(&mddev->disks)) {
7955 seq_printf(seq, "\n %llu blocks",
7956 (unsigned long long)
7957 mddev->array_sectors / 2);
7959 seq_printf(seq, "\n %llu blocks",
7960 (unsigned long long)sectors / 2);
7962 if (mddev->persistent) {
7963 if (mddev->major_version != 0 ||
7964 mddev->minor_version != 90) {
7965 seq_printf(seq," super %d.%d",
7966 mddev->major_version,
7967 mddev->minor_version);
7969 } else if (mddev->external)
7970 seq_printf(seq, " super external:%s",
7971 mddev->metadata_type);
7973 seq_printf(seq, " super non-persistent");
7976 mddev->pers->status(seq, mddev);
7977 seq_printf(seq, "\n ");
7978 if (mddev->pers->sync_request) {
7979 if (status_resync(seq, mddev))
7980 seq_printf(seq, "\n ");
7983 seq_printf(seq, "\n ");
7985 md_bitmap_status(seq, mddev->bitmap);
7987 seq_printf(seq, "\n");
7989 spin_unlock(&mddev->lock);
7994 static const struct seq_operations md_seq_ops = {
7995 .start = md_seq_start,
7996 .next = md_seq_next,
7997 .stop = md_seq_stop,
7998 .show = md_seq_show,
8001 static int md_seq_open(struct inode *inode, struct file *file)
8003 struct seq_file *seq;
8006 error = seq_open(file, &md_seq_ops);
8010 seq = file->private_data;
8011 seq->poll_event = atomic_read(&md_event_count);
8015 static int md_unloading;
8016 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8018 struct seq_file *seq = filp->private_data;
8022 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8023 poll_wait(filp, &md_event_waiters, wait);
8025 /* always allow read */
8026 mask = EPOLLIN | EPOLLRDNORM;
8028 if (seq->poll_event != atomic_read(&md_event_count))
8029 mask |= EPOLLERR | EPOLLPRI;
8033 static const struct file_operations md_seq_fops = {
8034 .owner = THIS_MODULE,
8035 .open = md_seq_open,
8037 .llseek = seq_lseek,
8038 .release = seq_release,
8039 .poll = mdstat_poll,
8042 int register_md_personality(struct md_personality *p)
8044 pr_debug("md: %s personality registered for level %d\n",
8046 spin_lock(&pers_lock);
8047 list_add_tail(&p->list, &pers_list);
8048 spin_unlock(&pers_lock);
8051 EXPORT_SYMBOL(register_md_personality);
8053 int unregister_md_personality(struct md_personality *p)
8055 pr_debug("md: %s personality unregistered\n", p->name);
8056 spin_lock(&pers_lock);
8057 list_del_init(&p->list);
8058 spin_unlock(&pers_lock);
8061 EXPORT_SYMBOL(unregister_md_personality);
8063 int register_md_cluster_operations(struct md_cluster_operations *ops,
8064 struct module *module)
8067 spin_lock(&pers_lock);
8068 if (md_cluster_ops != NULL)
8071 md_cluster_ops = ops;
8072 md_cluster_mod = module;
8074 spin_unlock(&pers_lock);
8077 EXPORT_SYMBOL(register_md_cluster_operations);
8079 int unregister_md_cluster_operations(void)
8081 spin_lock(&pers_lock);
8082 md_cluster_ops = NULL;
8083 spin_unlock(&pers_lock);
8086 EXPORT_SYMBOL(unregister_md_cluster_operations);
8088 int md_setup_cluster(struct mddev *mddev, int nodes)
8090 if (!md_cluster_ops)
8091 request_module("md-cluster");
8092 spin_lock(&pers_lock);
8093 /* ensure module won't be unloaded */
8094 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8095 pr_warn("can't find md-cluster module or get it's reference.\n");
8096 spin_unlock(&pers_lock);
8099 spin_unlock(&pers_lock);
8101 return md_cluster_ops->join(mddev, nodes);
8104 void md_cluster_stop(struct mddev *mddev)
8106 if (!md_cluster_ops)
8108 md_cluster_ops->leave(mddev);
8109 module_put(md_cluster_mod);
8112 static int is_mddev_idle(struct mddev *mddev, int init)
8114 struct md_rdev *rdev;
8120 rdev_for_each_rcu(rdev, mddev) {
8121 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8122 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8123 atomic_read(&disk->sync_io);
8124 /* sync IO will cause sync_io to increase before the disk_stats
8125 * as sync_io is counted when a request starts, and
8126 * disk_stats is counted when it completes.
8127 * So resync activity will cause curr_events to be smaller than
8128 * when there was no such activity.
8129 * non-sync IO will cause disk_stat to increase without
8130 * increasing sync_io so curr_events will (eventually)
8131 * be larger than it was before. Once it becomes
8132 * substantially larger, the test below will cause
8133 * the array to appear non-idle, and resync will slow
8135 * If there is a lot of outstanding resync activity when
8136 * we set last_event to curr_events, then all that activity
8137 * completing might cause the array to appear non-idle
8138 * and resync will be slowed down even though there might
8139 * not have been non-resync activity. This will only
8140 * happen once though. 'last_events' will soon reflect
8141 * the state where there is little or no outstanding
8142 * resync requests, and further resync activity will
8143 * always make curr_events less than last_events.
8146 if (init || curr_events - rdev->last_events > 64) {
8147 rdev->last_events = curr_events;
8155 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8157 /* another "blocks" (512byte) blocks have been synced */
8158 atomic_sub(blocks, &mddev->recovery_active);
8159 wake_up(&mddev->recovery_wait);
8161 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8162 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8163 md_wakeup_thread(mddev->thread);
8164 // stop recovery, signal do_sync ....
8167 EXPORT_SYMBOL(md_done_sync);
8169 /* md_write_start(mddev, bi)
8170 * If we need to update some array metadata (e.g. 'active' flag
8171 * in superblock) before writing, schedule a superblock update
8172 * and wait for it to complete.
8173 * A return value of 'false' means that the write wasn't recorded
8174 * and cannot proceed as the array is being suspend.
8176 bool md_write_start(struct mddev *mddev, struct bio *bi)
8180 if (bio_data_dir(bi) != WRITE)
8183 BUG_ON(mddev->ro == 1);
8184 if (mddev->ro == 2) {
8185 /* need to switch to read/write */
8187 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8188 md_wakeup_thread(mddev->thread);
8189 md_wakeup_thread(mddev->sync_thread);
8193 percpu_ref_get(&mddev->writes_pending);
8194 smp_mb(); /* Match smp_mb in set_in_sync() */
8195 if (mddev->safemode == 1)
8196 mddev->safemode = 0;
8197 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8198 if (mddev->in_sync || mddev->sync_checkers) {
8199 spin_lock(&mddev->lock);
8200 if (mddev->in_sync) {
8202 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8203 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8204 md_wakeup_thread(mddev->thread);
8207 spin_unlock(&mddev->lock);
8211 sysfs_notify_dirent_safe(mddev->sysfs_state);
8212 if (!mddev->has_superblocks)
8214 wait_event(mddev->sb_wait,
8215 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8217 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8218 percpu_ref_put(&mddev->writes_pending);
8223 EXPORT_SYMBOL(md_write_start);
8225 /* md_write_inc can only be called when md_write_start() has
8226 * already been called at least once of the current request.
8227 * It increments the counter and is useful when a single request
8228 * is split into several parts. Each part causes an increment and
8229 * so needs a matching md_write_end().
8230 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8231 * a spinlocked region.
8233 void md_write_inc(struct mddev *mddev, struct bio *bi)
8235 if (bio_data_dir(bi) != WRITE)
8237 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8238 percpu_ref_get(&mddev->writes_pending);
8240 EXPORT_SYMBOL(md_write_inc);
8242 void md_write_end(struct mddev *mddev)
8244 percpu_ref_put(&mddev->writes_pending);
8246 if (mddev->safemode == 2)
8247 md_wakeup_thread(mddev->thread);
8248 else if (mddev->safemode_delay)
8249 /* The roundup() ensures this only performs locking once
8250 * every ->safemode_delay jiffies
8252 mod_timer(&mddev->safemode_timer,
8253 roundup(jiffies, mddev->safemode_delay) +
8254 mddev->safemode_delay);
8257 EXPORT_SYMBOL(md_write_end);
8259 /* md_allow_write(mddev)
8260 * Calling this ensures that the array is marked 'active' so that writes
8261 * may proceed without blocking. It is important to call this before
8262 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8263 * Must be called with mddev_lock held.
8265 void md_allow_write(struct mddev *mddev)
8271 if (!mddev->pers->sync_request)
8274 spin_lock(&mddev->lock);
8275 if (mddev->in_sync) {
8277 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8278 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8279 if (mddev->safemode_delay &&
8280 mddev->safemode == 0)
8281 mddev->safemode = 1;
8282 spin_unlock(&mddev->lock);
8283 md_update_sb(mddev, 0);
8284 sysfs_notify_dirent_safe(mddev->sysfs_state);
8285 /* wait for the dirty state to be recorded in the metadata */
8286 wait_event(mddev->sb_wait,
8287 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8289 spin_unlock(&mddev->lock);
8291 EXPORT_SYMBOL_GPL(md_allow_write);
8293 #define SYNC_MARKS 10
8294 #define SYNC_MARK_STEP (3*HZ)
8295 #define UPDATE_FREQUENCY (5*60*HZ)
8296 void md_do_sync(struct md_thread *thread)
8298 struct mddev *mddev = thread->mddev;
8299 struct mddev *mddev2;
8300 unsigned int currspeed = 0, window;
8301 sector_t max_sectors,j, io_sectors, recovery_done;
8302 unsigned long mark[SYNC_MARKS];
8303 unsigned long update_time;
8304 sector_t mark_cnt[SYNC_MARKS];
8306 struct list_head *tmp;
8307 sector_t last_check;
8309 struct md_rdev *rdev;
8310 char *desc, *action = NULL;
8311 struct blk_plug plug;
8314 /* just incase thread restarts... */
8315 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8316 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8318 if (mddev->ro) {/* never try to sync a read-only array */
8319 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8323 if (mddev_is_clustered(mddev)) {
8324 ret = md_cluster_ops->resync_start(mddev);
8328 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8329 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8330 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8331 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8332 && ((unsigned long long)mddev->curr_resync_completed
8333 < (unsigned long long)mddev->resync_max_sectors))
8337 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8338 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8339 desc = "data-check";
8341 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8342 desc = "requested-resync";
8346 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8351 mddev->last_sync_action = action ?: desc;
8353 /* we overload curr_resync somewhat here.
8354 * 0 == not engaged in resync at all
8355 * 2 == checking that there is no conflict with another sync
8356 * 1 == like 2, but have yielded to allow conflicting resync to
8358 * other == active in resync - this many blocks
8360 * Before starting a resync we must have set curr_resync to
8361 * 2, and then checked that every "conflicting" array has curr_resync
8362 * less than ours. When we find one that is the same or higher
8363 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8364 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8365 * This will mean we have to start checking from the beginning again.
8370 int mddev2_minor = -1;
8371 mddev->curr_resync = 2;
8374 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8376 for_each_mddev(mddev2, tmp) {
8377 if (mddev2 == mddev)
8379 if (!mddev->parallel_resync
8380 && mddev2->curr_resync
8381 && match_mddev_units(mddev, mddev2)) {
8383 if (mddev < mddev2 && mddev->curr_resync == 2) {
8384 /* arbitrarily yield */
8385 mddev->curr_resync = 1;
8386 wake_up(&resync_wait);
8388 if (mddev > mddev2 && mddev->curr_resync == 1)
8389 /* no need to wait here, we can wait the next
8390 * time 'round when curr_resync == 2
8393 /* We need to wait 'interruptible' so as not to
8394 * contribute to the load average, and not to
8395 * be caught by 'softlockup'
8397 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8398 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8399 mddev2->curr_resync >= mddev->curr_resync) {
8400 if (mddev2_minor != mddev2->md_minor) {
8401 mddev2_minor = mddev2->md_minor;
8402 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8403 desc, mdname(mddev),
8407 if (signal_pending(current))
8408 flush_signals(current);
8410 finish_wait(&resync_wait, &wq);
8413 finish_wait(&resync_wait, &wq);
8416 } while (mddev->curr_resync < 2);
8419 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8420 /* resync follows the size requested by the personality,
8421 * which defaults to physical size, but can be virtual size
8423 max_sectors = mddev->resync_max_sectors;
8424 atomic64_set(&mddev->resync_mismatches, 0);
8425 /* we don't use the checkpoint if there's a bitmap */
8426 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8427 j = mddev->resync_min;
8428 else if (!mddev->bitmap)
8429 j = mddev->recovery_cp;
8431 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8432 max_sectors = mddev->resync_max_sectors;
8434 * If the original node aborts reshaping then we continue the
8435 * reshaping, so set j again to avoid restart reshape from the
8438 if (mddev_is_clustered(mddev) &&
8439 mddev->reshape_position != MaxSector)
8440 j = mddev->reshape_position;
8442 /* recovery follows the physical size of devices */
8443 max_sectors = mddev->dev_sectors;
8446 rdev_for_each_rcu(rdev, mddev)
8447 if (rdev->raid_disk >= 0 &&
8448 !test_bit(Journal, &rdev->flags) &&
8449 !test_bit(Faulty, &rdev->flags) &&
8450 !test_bit(In_sync, &rdev->flags) &&
8451 rdev->recovery_offset < j)
8452 j = rdev->recovery_offset;
8455 /* If there is a bitmap, we need to make sure all
8456 * writes that started before we added a spare
8457 * complete before we start doing a recovery.
8458 * Otherwise the write might complete and (via
8459 * bitmap_endwrite) set a bit in the bitmap after the
8460 * recovery has checked that bit and skipped that
8463 if (mddev->bitmap) {
8464 mddev->pers->quiesce(mddev, 1);
8465 mddev->pers->quiesce(mddev, 0);
8469 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8470 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8471 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8472 speed_max(mddev), desc);
8474 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8477 for (m = 0; m < SYNC_MARKS; m++) {
8479 mark_cnt[m] = io_sectors;
8482 mddev->resync_mark = mark[last_mark];
8483 mddev->resync_mark_cnt = mark_cnt[last_mark];
8486 * Tune reconstruction:
8488 window = 32 * (PAGE_SIZE / 512);
8489 pr_debug("md: using %dk window, over a total of %lluk.\n",
8490 window/2, (unsigned long long)max_sectors/2);
8492 atomic_set(&mddev->recovery_active, 0);
8496 pr_debug("md: resuming %s of %s from checkpoint.\n",
8497 desc, mdname(mddev));
8498 mddev->curr_resync = j;
8500 mddev->curr_resync = 3; /* no longer delayed */
8501 mddev->curr_resync_completed = j;
8502 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8503 md_new_event(mddev);
8504 update_time = jiffies;
8506 blk_start_plug(&plug);
8507 while (j < max_sectors) {
8512 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8513 ((mddev->curr_resync > mddev->curr_resync_completed &&
8514 (mddev->curr_resync - mddev->curr_resync_completed)
8515 > (max_sectors >> 4)) ||
8516 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8517 (j - mddev->curr_resync_completed)*2
8518 >= mddev->resync_max - mddev->curr_resync_completed ||
8519 mddev->curr_resync_completed > mddev->resync_max
8521 /* time to update curr_resync_completed */
8522 wait_event(mddev->recovery_wait,
8523 atomic_read(&mddev->recovery_active) == 0);
8524 mddev->curr_resync_completed = j;
8525 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8526 j > mddev->recovery_cp)
8527 mddev->recovery_cp = j;
8528 update_time = jiffies;
8529 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8530 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8533 while (j >= mddev->resync_max &&
8534 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8535 /* As this condition is controlled by user-space,
8536 * we can block indefinitely, so use '_interruptible'
8537 * to avoid triggering warnings.
8539 flush_signals(current); /* just in case */
8540 wait_event_interruptible(mddev->recovery_wait,
8541 mddev->resync_max > j
8542 || test_bit(MD_RECOVERY_INTR,
8546 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8549 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8551 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8555 if (!skipped) { /* actual IO requested */
8556 io_sectors += sectors;
8557 atomic_add(sectors, &mddev->recovery_active);
8560 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8564 if (j > max_sectors)
8565 /* when skipping, extra large numbers can be returned. */
8568 mddev->curr_resync = j;
8569 mddev->curr_mark_cnt = io_sectors;
8570 if (last_check == 0)
8571 /* this is the earliest that rebuild will be
8572 * visible in /proc/mdstat
8574 md_new_event(mddev);
8576 if (last_check + window > io_sectors || j == max_sectors)
8579 last_check = io_sectors;
8581 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8583 int next = (last_mark+1) % SYNC_MARKS;
8585 mddev->resync_mark = mark[next];
8586 mddev->resync_mark_cnt = mark_cnt[next];
8587 mark[next] = jiffies;
8588 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8592 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8596 * this loop exits only if either when we are slower than
8597 * the 'hard' speed limit, or the system was IO-idle for
8599 * the system might be non-idle CPU-wise, but we only care
8600 * about not overloading the IO subsystem. (things like an
8601 * e2fsck being done on the RAID array should execute fast)
8605 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8606 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8607 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8609 if (currspeed > speed_min(mddev)) {
8610 if (currspeed > speed_max(mddev)) {
8614 if (!is_mddev_idle(mddev, 0)) {
8616 * Give other IO more of a chance.
8617 * The faster the devices, the less we wait.
8619 wait_event(mddev->recovery_wait,
8620 !atomic_read(&mddev->recovery_active));
8624 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8625 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8626 ? "interrupted" : "done");
8628 * this also signals 'finished resyncing' to md_stop
8630 blk_finish_plug(&plug);
8631 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8633 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8634 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8635 mddev->curr_resync > 3) {
8636 mddev->curr_resync_completed = mddev->curr_resync;
8637 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8639 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8641 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8642 mddev->curr_resync > 3) {
8643 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8644 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8645 if (mddev->curr_resync >= mddev->recovery_cp) {
8646 pr_debug("md: checkpointing %s of %s.\n",
8647 desc, mdname(mddev));
8648 if (test_bit(MD_RECOVERY_ERROR,
8650 mddev->recovery_cp =
8651 mddev->curr_resync_completed;
8653 mddev->recovery_cp =
8657 mddev->recovery_cp = MaxSector;
8659 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8660 mddev->curr_resync = MaxSector;
8661 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8662 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
8664 rdev_for_each_rcu(rdev, mddev)
8665 if (rdev->raid_disk >= 0 &&
8666 mddev->delta_disks >= 0 &&
8667 !test_bit(Journal, &rdev->flags) &&
8668 !test_bit(Faulty, &rdev->flags) &&
8669 !test_bit(In_sync, &rdev->flags) &&
8670 rdev->recovery_offset < mddev->curr_resync)
8671 rdev->recovery_offset = mddev->curr_resync;
8677 /* set CHANGE_PENDING here since maybe another update is needed,
8678 * so other nodes are informed. It should be harmless for normal
8680 set_mask_bits(&mddev->sb_flags, 0,
8681 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8683 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8684 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8685 mddev->delta_disks > 0 &&
8686 mddev->pers->finish_reshape &&
8687 mddev->pers->size &&
8689 mddev_lock_nointr(mddev);
8690 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8691 mddev_unlock(mddev);
8692 if (!mddev_is_clustered(mddev)) {
8693 set_capacity(mddev->gendisk, mddev->array_sectors);
8694 revalidate_disk(mddev->gendisk);
8698 spin_lock(&mddev->lock);
8699 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8700 /* We completed so min/max setting can be forgotten if used. */
8701 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8702 mddev->resync_min = 0;
8703 mddev->resync_max = MaxSector;
8704 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8705 mddev->resync_min = mddev->curr_resync_completed;
8706 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8707 mddev->curr_resync = 0;
8708 spin_unlock(&mddev->lock);
8710 wake_up(&resync_wait);
8711 md_wakeup_thread(mddev->thread);
8714 EXPORT_SYMBOL_GPL(md_do_sync);
8716 static int remove_and_add_spares(struct mddev *mddev,
8717 struct md_rdev *this)
8719 struct md_rdev *rdev;
8722 bool remove_some = false;
8724 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8725 /* Mustn't remove devices when resync thread is running */
8728 rdev_for_each(rdev, mddev) {
8729 if ((this == NULL || rdev == this) &&
8730 rdev->raid_disk >= 0 &&
8731 !test_bit(Blocked, &rdev->flags) &&
8732 test_bit(Faulty, &rdev->flags) &&
8733 atomic_read(&rdev->nr_pending)==0) {
8734 /* Faulty non-Blocked devices with nr_pending == 0
8735 * never get nr_pending incremented,
8736 * never get Faulty cleared, and never get Blocked set.
8737 * So we can synchronize_rcu now rather than once per device
8740 set_bit(RemoveSynchronized, &rdev->flags);
8746 rdev_for_each(rdev, mddev) {
8747 if ((this == NULL || rdev == this) &&
8748 rdev->raid_disk >= 0 &&
8749 !test_bit(Blocked, &rdev->flags) &&
8750 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8751 (!test_bit(In_sync, &rdev->flags) &&
8752 !test_bit(Journal, &rdev->flags))) &&
8753 atomic_read(&rdev->nr_pending)==0)) {
8754 if (mddev->pers->hot_remove_disk(
8755 mddev, rdev) == 0) {
8756 sysfs_unlink_rdev(mddev, rdev);
8757 rdev->saved_raid_disk = rdev->raid_disk;
8758 rdev->raid_disk = -1;
8762 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8763 clear_bit(RemoveSynchronized, &rdev->flags);
8766 if (removed && mddev->kobj.sd)
8767 sysfs_notify(&mddev->kobj, NULL, "degraded");
8769 if (this && removed)
8772 rdev_for_each(rdev, mddev) {
8773 if (this && this != rdev)
8775 if (test_bit(Candidate, &rdev->flags))
8777 if (rdev->raid_disk >= 0 &&
8778 !test_bit(In_sync, &rdev->flags) &&
8779 !test_bit(Journal, &rdev->flags) &&
8780 !test_bit(Faulty, &rdev->flags))
8782 if (rdev->raid_disk >= 0)
8784 if (test_bit(Faulty, &rdev->flags))
8786 if (!test_bit(Journal, &rdev->flags)) {
8788 ! (rdev->saved_raid_disk >= 0 &&
8789 !test_bit(Bitmap_sync, &rdev->flags)))
8792 rdev->recovery_offset = 0;
8795 hot_add_disk(mddev, rdev) == 0) {
8796 if (sysfs_link_rdev(mddev, rdev))
8797 /* failure here is OK */;
8798 if (!test_bit(Journal, &rdev->flags))
8800 md_new_event(mddev);
8801 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8806 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8810 static void md_start_sync(struct work_struct *ws)
8812 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8814 mddev->sync_thread = md_register_thread(md_do_sync,
8817 if (!mddev->sync_thread) {
8818 pr_warn("%s: could not start resync thread...\n",
8820 /* leave the spares where they are, it shouldn't hurt */
8821 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8822 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8823 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8824 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8825 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8826 wake_up(&resync_wait);
8827 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8829 if (mddev->sysfs_action)
8830 sysfs_notify_dirent_safe(mddev->sysfs_action);
8832 md_wakeup_thread(mddev->sync_thread);
8833 sysfs_notify_dirent_safe(mddev->sysfs_action);
8834 md_new_event(mddev);
8838 * This routine is regularly called by all per-raid-array threads to
8839 * deal with generic issues like resync and super-block update.
8840 * Raid personalities that don't have a thread (linear/raid0) do not
8841 * need this as they never do any recovery or update the superblock.
8843 * It does not do any resync itself, but rather "forks" off other threads
8844 * to do that as needed.
8845 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8846 * "->recovery" and create a thread at ->sync_thread.
8847 * When the thread finishes it sets MD_RECOVERY_DONE
8848 * and wakeups up this thread which will reap the thread and finish up.
8849 * This thread also removes any faulty devices (with nr_pending == 0).
8851 * The overall approach is:
8852 * 1/ if the superblock needs updating, update it.
8853 * 2/ If a recovery thread is running, don't do anything else.
8854 * 3/ If recovery has finished, clean up, possibly marking spares active.
8855 * 4/ If there are any faulty devices, remove them.
8856 * 5/ If array is degraded, try to add spares devices
8857 * 6/ If array has spares or is not in-sync, start a resync thread.
8859 void md_check_recovery(struct mddev *mddev)
8861 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8862 /* Write superblock - thread that called mddev_suspend()
8863 * holds reconfig_mutex for us.
8865 set_bit(MD_UPDATING_SB, &mddev->flags);
8866 smp_mb__after_atomic();
8867 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8868 md_update_sb(mddev, 0);
8869 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8870 wake_up(&mddev->sb_wait);
8873 if (mddev->suspended)
8877 md_bitmap_daemon_work(mddev);
8879 if (signal_pending(current)) {
8880 if (mddev->pers->sync_request && !mddev->external) {
8881 pr_debug("md: %s in immediate safe mode\n",
8883 mddev->safemode = 2;
8885 flush_signals(current);
8888 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8891 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8892 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8893 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8894 (mddev->external == 0 && mddev->safemode == 1) ||
8895 (mddev->safemode == 2
8896 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8900 if (mddev_trylock(mddev)) {
8903 if (!mddev->external && mddev->safemode == 1)
8904 mddev->safemode = 0;
8907 struct md_rdev *rdev;
8908 if (!mddev->external && mddev->in_sync)
8909 /* 'Blocked' flag not needed as failed devices
8910 * will be recorded if array switched to read/write.
8911 * Leaving it set will prevent the device
8912 * from being removed.
8914 rdev_for_each(rdev, mddev)
8915 clear_bit(Blocked, &rdev->flags);
8916 /* On a read-only array we can:
8917 * - remove failed devices
8918 * - add already-in_sync devices if the array itself
8920 * As we only add devices that are already in-sync,
8921 * we can activate the spares immediately.
8923 remove_and_add_spares(mddev, NULL);
8924 /* There is no thread, but we need to call
8925 * ->spare_active and clear saved_raid_disk
8927 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8928 md_reap_sync_thread(mddev);
8929 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8930 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8931 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8935 if (mddev_is_clustered(mddev)) {
8936 struct md_rdev *rdev;
8937 /* kick the device if another node issued a
8940 rdev_for_each(rdev, mddev) {
8941 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8942 rdev->raid_disk < 0)
8943 md_kick_rdev_from_array(rdev);
8947 if (!mddev->external && !mddev->in_sync) {
8948 spin_lock(&mddev->lock);
8950 spin_unlock(&mddev->lock);
8953 if (mddev->sb_flags)
8954 md_update_sb(mddev, 0);
8956 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8957 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8958 /* resync/recovery still happening */
8959 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8962 if (mddev->sync_thread) {
8963 md_reap_sync_thread(mddev);
8966 /* Set RUNNING before clearing NEEDED to avoid
8967 * any transients in the value of "sync_action".
8969 mddev->curr_resync_completed = 0;
8970 spin_lock(&mddev->lock);
8971 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8972 spin_unlock(&mddev->lock);
8973 /* Clear some bits that don't mean anything, but
8976 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8977 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8979 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8980 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8982 /* no recovery is running.
8983 * remove any failed drives, then
8984 * add spares if possible.
8985 * Spares are also removed and re-added, to allow
8986 * the personality to fail the re-add.
8989 if (mddev->reshape_position != MaxSector) {
8990 if (mddev->pers->check_reshape == NULL ||
8991 mddev->pers->check_reshape(mddev) != 0)
8992 /* Cannot proceed */
8994 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8995 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8996 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8997 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8998 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8999 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9000 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9001 } else if (mddev->recovery_cp < MaxSector) {
9002 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9003 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9004 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9005 /* nothing to be done ... */
9008 if (mddev->pers->sync_request) {
9010 /* We are adding a device or devices to an array
9011 * which has the bitmap stored on all devices.
9012 * So make sure all bitmap pages get written
9014 md_bitmap_write_all(mddev->bitmap);
9016 INIT_WORK(&mddev->del_work, md_start_sync);
9017 queue_work(md_misc_wq, &mddev->del_work);
9021 if (!mddev->sync_thread) {
9022 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9023 wake_up(&resync_wait);
9024 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9026 if (mddev->sysfs_action)
9027 sysfs_notify_dirent_safe(mddev->sysfs_action);
9030 wake_up(&mddev->sb_wait);
9031 mddev_unlock(mddev);
9034 EXPORT_SYMBOL(md_check_recovery);
9036 void md_reap_sync_thread(struct mddev *mddev)
9038 struct md_rdev *rdev;
9039 sector_t old_dev_sectors = mddev->dev_sectors;
9040 bool is_reshaped = false;
9042 /* resync has finished, collect result */
9043 md_unregister_thread(&mddev->sync_thread);
9044 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9045 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
9047 /* activate any spares */
9048 if (mddev->pers->spare_active(mddev)) {
9049 sysfs_notify(&mddev->kobj, NULL,
9051 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9054 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9055 mddev->pers->finish_reshape) {
9056 mddev->pers->finish_reshape(mddev);
9057 if (mddev_is_clustered(mddev))
9061 /* If array is no-longer degraded, then any saved_raid_disk
9062 * information must be scrapped.
9064 if (!mddev->degraded)
9065 rdev_for_each(rdev, mddev)
9066 rdev->saved_raid_disk = -1;
9068 md_update_sb(mddev, 1);
9069 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9070 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9072 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9073 md_cluster_ops->resync_finish(mddev);
9074 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9075 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9076 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9077 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9078 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9079 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9081 * We call md_cluster_ops->update_size here because sync_size could
9082 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9083 * so it is time to update size across cluster.
9085 if (mddev_is_clustered(mddev) && is_reshaped
9086 && !test_bit(MD_CLOSING, &mddev->flags))
9087 md_cluster_ops->update_size(mddev, old_dev_sectors);
9088 wake_up(&resync_wait);
9089 /* flag recovery needed just to double check */
9090 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9091 sysfs_notify_dirent_safe(mddev->sysfs_action);
9092 md_new_event(mddev);
9093 if (mddev->event_work.func)
9094 queue_work(md_misc_wq, &mddev->event_work);
9096 EXPORT_SYMBOL(md_reap_sync_thread);
9098 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9100 sysfs_notify_dirent_safe(rdev->sysfs_state);
9101 wait_event_timeout(rdev->blocked_wait,
9102 !test_bit(Blocked, &rdev->flags) &&
9103 !test_bit(BlockedBadBlocks, &rdev->flags),
9104 msecs_to_jiffies(5000));
9105 rdev_dec_pending(rdev, mddev);
9107 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9109 void md_finish_reshape(struct mddev *mddev)
9111 /* called be personality module when reshape completes. */
9112 struct md_rdev *rdev;
9114 rdev_for_each(rdev, mddev) {
9115 if (rdev->data_offset > rdev->new_data_offset)
9116 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9118 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9119 rdev->data_offset = rdev->new_data_offset;
9122 EXPORT_SYMBOL(md_finish_reshape);
9124 /* Bad block management */
9126 /* Returns 1 on success, 0 on failure */
9127 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9130 struct mddev *mddev = rdev->mddev;
9133 s += rdev->new_data_offset;
9135 s += rdev->data_offset;
9136 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9138 /* Make sure they get written out promptly */
9139 if (test_bit(ExternalBbl, &rdev->flags))
9140 sysfs_notify(&rdev->kobj, NULL,
9141 "unacknowledged_bad_blocks");
9142 sysfs_notify_dirent_safe(rdev->sysfs_state);
9143 set_mask_bits(&mddev->sb_flags, 0,
9144 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9145 md_wakeup_thread(rdev->mddev->thread);
9150 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9152 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9157 s += rdev->new_data_offset;
9159 s += rdev->data_offset;
9160 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9161 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9162 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9165 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9167 static int md_notify_reboot(struct notifier_block *this,
9168 unsigned long code, void *x)
9170 struct list_head *tmp;
9171 struct mddev *mddev;
9174 for_each_mddev(mddev, tmp) {
9175 if (mddev_trylock(mddev)) {
9177 __md_stop_writes(mddev);
9178 if (mddev->persistent)
9179 mddev->safemode = 2;
9180 mddev_unlock(mddev);
9185 * certain more exotic SCSI devices are known to be
9186 * volatile wrt too early system reboots. While the
9187 * right place to handle this issue is the given
9188 * driver, we do want to have a safe RAID driver ...
9196 static struct notifier_block md_notifier = {
9197 .notifier_call = md_notify_reboot,
9199 .priority = INT_MAX, /* before any real devices */
9202 static void md_geninit(void)
9204 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9206 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9209 static int __init md_init(void)
9213 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9217 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9221 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9224 if ((ret = register_blkdev(0, "mdp")) < 0)
9228 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9229 md_probe, NULL, NULL);
9230 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9231 md_probe, NULL, NULL);
9233 register_reboot_notifier(&md_notifier);
9234 raid_table_header = register_sysctl_table(raid_root_table);
9240 unregister_blkdev(MD_MAJOR, "md");
9242 destroy_workqueue(md_misc_wq);
9244 destroy_workqueue(md_wq);
9249 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9251 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9252 struct md_rdev *rdev2;
9254 char b[BDEVNAME_SIZE];
9257 * If size is changed in another node then we need to
9258 * do resize as well.
9260 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9261 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9263 pr_info("md-cluster: resize failed\n");
9265 md_bitmap_update_sb(mddev->bitmap);
9268 /* Check for change of roles in the active devices */
9269 rdev_for_each(rdev2, mddev) {
9270 if (test_bit(Faulty, &rdev2->flags))
9273 /* Check if the roles changed */
9274 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9276 if (test_bit(Candidate, &rdev2->flags)) {
9277 if (role == 0xfffe) {
9278 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9279 md_kick_rdev_from_array(rdev2);
9283 clear_bit(Candidate, &rdev2->flags);
9286 if (role != rdev2->raid_disk) {
9288 * got activated except reshape is happening.
9290 if (rdev2->raid_disk == -1 && role != 0xffff &&
9291 !(le32_to_cpu(sb->feature_map) &
9292 MD_FEATURE_RESHAPE_ACTIVE)) {
9293 rdev2->saved_raid_disk = role;
9294 ret = remove_and_add_spares(mddev, rdev2);
9295 pr_info("Activated spare: %s\n",
9296 bdevname(rdev2->bdev,b));
9297 /* wakeup mddev->thread here, so array could
9298 * perform resync with the new activated disk */
9299 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9300 md_wakeup_thread(mddev->thread);
9303 * We just want to do the minimum to mark the disk
9304 * as faulty. The recovery is performed by the
9305 * one who initiated the error.
9307 if ((role == 0xfffe) || (role == 0xfffd)) {
9308 md_error(mddev, rdev2);
9309 clear_bit(Blocked, &rdev2->flags);
9314 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9315 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9318 * Since mddev->delta_disks has already updated in update_raid_disks,
9319 * so it is time to check reshape.
9321 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9322 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9324 * reshape is happening in the remote node, we need to
9325 * update reshape_position and call start_reshape.
9327 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9328 if (mddev->pers->update_reshape_pos)
9329 mddev->pers->update_reshape_pos(mddev);
9330 if (mddev->pers->start_reshape)
9331 mddev->pers->start_reshape(mddev);
9332 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9333 mddev->reshape_position != MaxSector &&
9334 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9335 /* reshape is just done in another node. */
9336 mddev->reshape_position = MaxSector;
9337 if (mddev->pers->update_reshape_pos)
9338 mddev->pers->update_reshape_pos(mddev);
9341 /* Finally set the event to be up to date */
9342 mddev->events = le64_to_cpu(sb->events);
9345 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9348 struct page *swapout = rdev->sb_page;
9349 struct mdp_superblock_1 *sb;
9351 /* Store the sb page of the rdev in the swapout temporary
9352 * variable in case we err in the future
9354 rdev->sb_page = NULL;
9355 err = alloc_disk_sb(rdev);
9357 ClearPageUptodate(rdev->sb_page);
9358 rdev->sb_loaded = 0;
9359 err = super_types[mddev->major_version].
9360 load_super(rdev, NULL, mddev->minor_version);
9363 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9364 __func__, __LINE__, rdev->desc_nr, err);
9366 put_page(rdev->sb_page);
9367 rdev->sb_page = swapout;
9368 rdev->sb_loaded = 1;
9372 sb = page_address(rdev->sb_page);
9373 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9377 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9378 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9380 /* The other node finished recovery, call spare_active to set
9381 * device In_sync and mddev->degraded
9383 if (rdev->recovery_offset == MaxSector &&
9384 !test_bit(In_sync, &rdev->flags) &&
9385 mddev->pers->spare_active(mddev))
9386 sysfs_notify(&mddev->kobj, NULL, "degraded");
9392 void md_reload_sb(struct mddev *mddev, int nr)
9394 struct md_rdev *rdev;
9398 rdev_for_each_rcu(rdev, mddev) {
9399 if (rdev->desc_nr == nr)
9403 if (!rdev || rdev->desc_nr != nr) {
9404 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9408 err = read_rdev(mddev, rdev);
9412 check_sb_changes(mddev, rdev);
9414 /* Read all rdev's to update recovery_offset */
9415 rdev_for_each_rcu(rdev, mddev) {
9416 if (!test_bit(Faulty, &rdev->flags))
9417 read_rdev(mddev, rdev);
9420 EXPORT_SYMBOL(md_reload_sb);
9425 * Searches all registered partitions for autorun RAID arrays
9429 static DEFINE_MUTEX(detected_devices_mutex);
9430 static LIST_HEAD(all_detected_devices);
9431 struct detected_devices_node {
9432 struct list_head list;
9436 void md_autodetect_dev(dev_t dev)
9438 struct detected_devices_node *node_detected_dev;
9440 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9441 if (node_detected_dev) {
9442 node_detected_dev->dev = dev;
9443 mutex_lock(&detected_devices_mutex);
9444 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9445 mutex_unlock(&detected_devices_mutex);
9449 static void autostart_arrays(int part)
9451 struct md_rdev *rdev;
9452 struct detected_devices_node *node_detected_dev;
9454 int i_scanned, i_passed;
9459 pr_info("md: Autodetecting RAID arrays.\n");
9461 mutex_lock(&detected_devices_mutex);
9462 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9464 node_detected_dev = list_entry(all_detected_devices.next,
9465 struct detected_devices_node, list);
9466 list_del(&node_detected_dev->list);
9467 dev = node_detected_dev->dev;
9468 kfree(node_detected_dev);
9469 mutex_unlock(&detected_devices_mutex);
9470 rdev = md_import_device(dev,0, 90);
9471 mutex_lock(&detected_devices_mutex);
9475 if (test_bit(Faulty, &rdev->flags))
9478 set_bit(AutoDetected, &rdev->flags);
9479 list_add(&rdev->same_set, &pending_raid_disks);
9482 mutex_unlock(&detected_devices_mutex);
9484 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9486 autorun_devices(part);
9489 #endif /* !MODULE */
9491 static __exit void md_exit(void)
9493 struct mddev *mddev;
9494 struct list_head *tmp;
9497 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9498 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9500 unregister_blkdev(MD_MAJOR,"md");
9501 unregister_blkdev(mdp_major, "mdp");
9502 unregister_reboot_notifier(&md_notifier);
9503 unregister_sysctl_table(raid_table_header);
9505 /* We cannot unload the modules while some process is
9506 * waiting for us in select() or poll() - wake them up
9509 while (waitqueue_active(&md_event_waiters)) {
9510 /* not safe to leave yet */
9511 wake_up(&md_event_waiters);
9515 remove_proc_entry("mdstat", NULL);
9517 for_each_mddev(mddev, tmp) {
9518 export_array(mddev);
9520 mddev->hold_active = 0;
9522 * for_each_mddev() will call mddev_put() at the end of each
9523 * iteration. As the mddev is now fully clear, this will
9524 * schedule the mddev for destruction by a workqueue, and the
9525 * destroy_workqueue() below will wait for that to complete.
9528 destroy_workqueue(md_misc_wq);
9529 destroy_workqueue(md_wq);
9532 subsys_initcall(md_init);
9533 module_exit(md_exit)
9535 static int get_ro(char *buffer, const struct kernel_param *kp)
9537 return sprintf(buffer, "%d", start_readonly);
9539 static int set_ro(const char *val, const struct kernel_param *kp)
9541 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9544 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9545 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9546 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9547 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9549 MODULE_LICENSE("GPL");
9550 MODULE_DESCRIPTION("MD RAID framework");
9552 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);