2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/sched/signal.h>
48 #include <linux/kthread.h>
49 #include <linux/blkdev.h>
50 #include <linux/badblocks.h>
51 #include <linux/sysctl.h>
52 #include <linux/seq_file.h>
54 #include <linux/poll.h>
55 #include <linux/ctype.h>
56 #include <linux/string.h>
57 #include <linux/hdreg.h>
58 #include <linux/proc_fs.h>
59 #include <linux/random.h>
60 #include <linux/module.h>
61 #include <linux/reboot.h>
62 #include <linux/file.h>
63 #include <linux/compat.h>
64 #include <linux/delay.h>
65 #include <linux/raid/md_p.h>
66 #include <linux/raid/md_u.h>
67 #include <linux/slab.h>
68 #include <linux/percpu-refcount.h>
70 #include <trace/events/block.h>
72 #include "md-bitmap.h"
73 #include "md-cluster.h"
76 static void autostart_arrays(int part);
79 /* pers_list is a list of registered personalities protected
81 * pers_lock does extra service to protect accesses to
82 * mddev->thread when the mutex cannot be held.
84 static LIST_HEAD(pers_list);
85 static DEFINE_SPINLOCK(pers_lock);
87 static struct kobj_type md_ktype;
89 struct md_cluster_operations *md_cluster_ops;
90 EXPORT_SYMBOL(md_cluster_ops);
91 struct module *md_cluster_mod;
92 EXPORT_SYMBOL(md_cluster_mod);
94 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
95 static struct workqueue_struct *md_wq;
96 static struct workqueue_struct *md_misc_wq;
98 static int remove_and_add_spares(struct mddev *mddev,
99 struct md_rdev *this);
100 static void mddev_detach(struct mddev *mddev);
103 * Default number of read corrections we'll attempt on an rdev
104 * before ejecting it from the array. We divide the read error
105 * count by 2 for every hour elapsed between read errors.
107 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
109 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
110 * is 1000 KB/sec, so the extra system load does not show up that much.
111 * Increase it if you want to have more _guaranteed_ speed. Note that
112 * the RAID driver will use the maximum available bandwidth if the IO
113 * subsystem is idle. There is also an 'absolute maximum' reconstruction
114 * speed limit - in case reconstruction slows down your system despite
117 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
118 * or /sys/block/mdX/md/sync_speed_{min,max}
121 static int sysctl_speed_limit_min = 1000;
122 static int sysctl_speed_limit_max = 200000;
123 static inline int speed_min(struct mddev *mddev)
125 return mddev->sync_speed_min ?
126 mddev->sync_speed_min : sysctl_speed_limit_min;
129 static inline int speed_max(struct mddev *mddev)
131 return mddev->sync_speed_max ?
132 mddev->sync_speed_max : sysctl_speed_limit_max;
135 static struct ctl_table_header *raid_table_header;
137 static struct ctl_table raid_table[] = {
139 .procname = "speed_limit_min",
140 .data = &sysctl_speed_limit_min,
141 .maxlen = sizeof(int),
142 .mode = S_IRUGO|S_IWUSR,
143 .proc_handler = proc_dointvec,
146 .procname = "speed_limit_max",
147 .data = &sysctl_speed_limit_max,
148 .maxlen = sizeof(int),
149 .mode = S_IRUGO|S_IWUSR,
150 .proc_handler = proc_dointvec,
155 static struct ctl_table raid_dir_table[] = {
159 .mode = S_IRUGO|S_IXUGO,
165 static struct ctl_table raid_root_table[] = {
170 .child = raid_dir_table,
175 static const struct block_device_operations md_fops;
177 static int start_readonly;
180 * The original mechanism for creating an md device is to create
181 * a device node in /dev and to open it. This causes races with device-close.
182 * The preferred method is to write to the "new_array" module parameter.
183 * This can avoid races.
184 * Setting create_on_open to false disables the original mechanism
185 * so all the races disappear.
187 static bool create_on_open = true;
189 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
194 if (!mddev || !bioset_initialized(&mddev->bio_set))
195 return bio_alloc(gfp_mask, nr_iovecs);
197 b = bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set);
202 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
204 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
206 if (!mddev || !bioset_initialized(&mddev->sync_set))
207 return bio_alloc(GFP_NOIO, 1);
209 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
213 * We have a system wide 'event count' that is incremented
214 * on any 'interesting' event, and readers of /proc/mdstat
215 * can use 'poll' or 'select' to find out when the event
219 * start array, stop array, error, add device, remove device,
220 * start build, activate spare
222 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
223 static atomic_t md_event_count;
224 void md_new_event(struct mddev *mddev)
226 atomic_inc(&md_event_count);
227 wake_up(&md_event_waiters);
229 EXPORT_SYMBOL_GPL(md_new_event);
232 * Enables to iterate over all existing md arrays
233 * all_mddevs_lock protects this list.
235 static LIST_HEAD(all_mddevs);
236 static DEFINE_SPINLOCK(all_mddevs_lock);
239 * iterates through all used mddevs in the system.
240 * We take care to grab the all_mddevs_lock whenever navigating
241 * the list, and to always hold a refcount when unlocked.
242 * Any code which breaks out of this loop while own
243 * a reference to the current mddev and must mddev_put it.
245 #define for_each_mddev(_mddev,_tmp) \
247 for (({ spin_lock(&all_mddevs_lock); \
248 _tmp = all_mddevs.next; \
250 ({ if (_tmp != &all_mddevs) \
251 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
252 spin_unlock(&all_mddevs_lock); \
253 if (_mddev) mddev_put(_mddev); \
254 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
255 _tmp != &all_mddevs;}); \
256 ({ spin_lock(&all_mddevs_lock); \
257 _tmp = _tmp->next;}) \
260 /* Rather than calling directly into the personality make_request function,
261 * IO requests come here first so that we can check if the device is
262 * being suspended pending a reconfiguration.
263 * We hold a refcount over the call to ->make_request. By the time that
264 * call has finished, the bio has been linked into some internal structure
265 * and so is visible to ->quiesce(), so we don't need the refcount any more.
267 static bool is_suspended(struct mddev *mddev, struct bio *bio)
269 if (mddev->suspended)
271 if (bio_data_dir(bio) != WRITE)
273 if (mddev->suspend_lo >= mddev->suspend_hi)
275 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
277 if (bio_end_sector(bio) < mddev->suspend_lo)
282 void md_handle_request(struct mddev *mddev, struct bio *bio)
286 if (is_suspended(mddev, bio)) {
289 prepare_to_wait(&mddev->sb_wait, &__wait,
290 TASK_UNINTERRUPTIBLE);
291 if (!is_suspended(mddev, bio))
297 finish_wait(&mddev->sb_wait, &__wait);
299 atomic_inc(&mddev->active_io);
302 if (!mddev->pers->make_request(mddev, bio)) {
303 atomic_dec(&mddev->active_io);
304 wake_up(&mddev->sb_wait);
305 goto check_suspended;
308 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
309 wake_up(&mddev->sb_wait);
311 EXPORT_SYMBOL(md_handle_request);
313 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
315 const int rw = bio_data_dir(bio);
316 const int sgrp = op_stat_group(bio_op(bio));
317 struct mddev *mddev = q->queuedata;
318 unsigned int sectors;
321 blk_queue_split(q, &bio);
323 if (mddev == NULL || mddev->pers == NULL) {
325 return BLK_QC_T_NONE;
327 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
328 if (bio_sectors(bio) != 0)
329 bio->bi_status = BLK_STS_IOERR;
331 return BLK_QC_T_NONE;
335 * save the sectors now since our bio can
336 * go away inside make_request
338 sectors = bio_sectors(bio);
339 /* bio could be mergeable after passing to underlayer */
340 bio->bi_opf &= ~REQ_NOMERGE;
342 md_handle_request(mddev, bio);
344 cpu = part_stat_lock();
345 part_stat_inc(cpu, &mddev->gendisk->part0, ios[sgrp]);
346 part_stat_add(cpu, &mddev->gendisk->part0, sectors[sgrp], sectors);
349 return BLK_QC_T_NONE;
352 /* mddev_suspend makes sure no new requests are submitted
353 * to the device, and that any requests that have been submitted
354 * are completely handled.
355 * Once mddev_detach() is called and completes, the module will be
358 void mddev_suspend(struct mddev *mddev)
360 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
361 lockdep_assert_held(&mddev->reconfig_mutex);
362 if (mddev->suspended++)
365 wake_up(&mddev->sb_wait);
366 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
367 smp_mb__after_atomic();
368 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
369 mddev->pers->quiesce(mddev, 1);
370 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
371 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
373 del_timer_sync(&mddev->safemode_timer);
375 EXPORT_SYMBOL_GPL(mddev_suspend);
377 void mddev_resume(struct mddev *mddev)
379 lockdep_assert_held(&mddev->reconfig_mutex);
380 if (--mddev->suspended)
382 wake_up(&mddev->sb_wait);
383 mddev->pers->quiesce(mddev, 0);
385 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
386 md_wakeup_thread(mddev->thread);
387 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
389 EXPORT_SYMBOL_GPL(mddev_resume);
391 int mddev_congested(struct mddev *mddev, int bits)
393 struct md_personality *pers = mddev->pers;
397 if (mddev->suspended)
399 else if (pers && pers->congested)
400 ret = pers->congested(mddev, bits);
404 EXPORT_SYMBOL_GPL(mddev_congested);
405 static int md_congested(void *data, int bits)
407 struct mddev *mddev = data;
408 return mddev_congested(mddev, bits);
412 * Generic flush handling for md
415 static void md_end_flush(struct bio *bio)
417 struct md_rdev *rdev = bio->bi_private;
418 struct mddev *mddev = rdev->mddev;
420 rdev_dec_pending(rdev, mddev);
422 if (atomic_dec_and_test(&mddev->flush_pending)) {
423 /* The pre-request flush has finished */
424 queue_work(md_wq, &mddev->flush_work);
429 static void md_submit_flush_data(struct work_struct *ws);
431 static void submit_flushes(struct work_struct *ws)
433 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
434 struct md_rdev *rdev;
436 mddev->start_flush = ktime_get_boottime();
437 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
438 atomic_set(&mddev->flush_pending, 1);
440 rdev_for_each_rcu(rdev, mddev)
441 if (rdev->raid_disk >= 0 &&
442 !test_bit(Faulty, &rdev->flags)) {
443 /* Take two references, one is dropped
444 * when request finishes, one after
445 * we reclaim rcu_read_lock
448 atomic_inc(&rdev->nr_pending);
449 atomic_inc(&rdev->nr_pending);
451 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
452 bi->bi_end_io = md_end_flush;
453 bi->bi_private = rdev;
454 bio_set_dev(bi, rdev->bdev);
455 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
456 atomic_inc(&mddev->flush_pending);
459 rdev_dec_pending(rdev, mddev);
462 if (atomic_dec_and_test(&mddev->flush_pending))
463 queue_work(md_wq, &mddev->flush_work);
466 static void md_submit_flush_data(struct work_struct *ws)
468 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
469 struct bio *bio = mddev->flush_bio;
472 * must reset flush_bio before calling into md_handle_request to avoid a
473 * deadlock, because other bios passed md_handle_request suspend check
474 * could wait for this and below md_handle_request could wait for those
475 * bios because of suspend check
477 spin_lock_irq(&mddev->lock);
478 mddev->last_flush = mddev->start_flush;
479 mddev->flush_bio = NULL;
480 spin_unlock_irq(&mddev->lock);
481 wake_up(&mddev->sb_wait);
483 if (bio->bi_iter.bi_size == 0) {
484 /* an empty barrier - all done */
487 bio->bi_opf &= ~REQ_PREFLUSH;
488 md_handle_request(mddev, bio);
493 * Manages consolidation of flushes and submitting any flushes needed for
494 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
495 * being finished in another context. Returns false if the flushing is
496 * complete but still needs the I/O portion of the bio to be processed.
498 bool md_flush_request(struct mddev *mddev, struct bio *bio)
500 ktime_t start = ktime_get_boottime();
501 spin_lock_irq(&mddev->lock);
502 wait_event_lock_irq(mddev->sb_wait,
504 ktime_after(mddev->last_flush, start),
506 if (!ktime_after(mddev->last_flush, start)) {
507 WARN_ON(mddev->flush_bio);
508 mddev->flush_bio = bio;
511 spin_unlock_irq(&mddev->lock);
514 INIT_WORK(&mddev->flush_work, submit_flushes);
515 queue_work(md_wq, &mddev->flush_work);
517 /* flush was performed for some other bio while we waited. */
518 if (bio->bi_iter.bi_size == 0)
519 /* an empty barrier - all done */
522 bio->bi_opf &= ~REQ_PREFLUSH;
528 EXPORT_SYMBOL(md_flush_request);
530 static inline struct mddev *mddev_get(struct mddev *mddev)
532 atomic_inc(&mddev->active);
536 static void mddev_delayed_delete(struct work_struct *ws);
538 static void mddev_put(struct mddev *mddev)
540 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
542 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
543 mddev->ctime == 0 && !mddev->hold_active) {
544 /* Array is not configured at all, and not held active,
546 list_del_init(&mddev->all_mddevs);
549 * Call queue_work inside the spinlock so that
550 * flush_workqueue() after mddev_find will succeed in waiting
551 * for the work to be done.
553 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
554 queue_work(md_misc_wq, &mddev->del_work);
556 spin_unlock(&all_mddevs_lock);
559 static void md_safemode_timeout(struct timer_list *t);
561 void mddev_init(struct mddev *mddev)
563 kobject_init(&mddev->kobj, &md_ktype);
564 mutex_init(&mddev->open_mutex);
565 mutex_init(&mddev->reconfig_mutex);
566 mutex_init(&mddev->bitmap_info.mutex);
567 INIT_LIST_HEAD(&mddev->disks);
568 INIT_LIST_HEAD(&mddev->all_mddevs);
569 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
570 atomic_set(&mddev->active, 1);
571 atomic_set(&mddev->openers, 0);
572 atomic_set(&mddev->active_io, 0);
573 spin_lock_init(&mddev->lock);
574 atomic_set(&mddev->flush_pending, 0);
575 init_waitqueue_head(&mddev->sb_wait);
576 init_waitqueue_head(&mddev->recovery_wait);
577 mddev->reshape_position = MaxSector;
578 mddev->reshape_backwards = 0;
579 mddev->last_sync_action = "none";
580 mddev->resync_min = 0;
581 mddev->resync_max = MaxSector;
582 mddev->level = LEVEL_NONE;
584 EXPORT_SYMBOL_GPL(mddev_init);
586 static struct mddev *mddev_find_locked(dev_t unit)
590 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
591 if (mddev->unit == unit)
597 static struct mddev *mddev_find(dev_t unit)
601 if (MAJOR(unit) != MD_MAJOR)
602 unit &= ~((1 << MdpMinorShift) - 1);
604 spin_lock(&all_mddevs_lock);
605 mddev = mddev_find_locked(unit);
608 spin_unlock(&all_mddevs_lock);
613 static struct mddev *mddev_find_or_alloc(dev_t unit)
615 struct mddev *mddev, *new = NULL;
617 if (unit && MAJOR(unit) != MD_MAJOR)
618 unit &= ~((1<<MdpMinorShift)-1);
621 spin_lock(&all_mddevs_lock);
624 mddev = mddev_find_locked(unit);
627 spin_unlock(&all_mddevs_lock);
633 list_add(&new->all_mddevs, &all_mddevs);
634 spin_unlock(&all_mddevs_lock);
635 new->hold_active = UNTIL_IOCTL;
639 /* find an unused unit number */
640 static int next_minor = 512;
641 int start = next_minor;
645 dev = MKDEV(MD_MAJOR, next_minor);
647 if (next_minor > MINORMASK)
649 if (next_minor == start) {
650 /* Oh dear, all in use. */
651 spin_unlock(&all_mddevs_lock);
656 is_free = !mddev_find_locked(dev);
659 new->md_minor = MINOR(dev);
660 new->hold_active = UNTIL_STOP;
661 list_add(&new->all_mddevs, &all_mddevs);
662 spin_unlock(&all_mddevs_lock);
665 spin_unlock(&all_mddevs_lock);
667 new = kzalloc(sizeof(*new), GFP_KERNEL);
672 if (MAJOR(unit) == MD_MAJOR)
673 new->md_minor = MINOR(unit);
675 new->md_minor = MINOR(unit) >> MdpMinorShift;
682 static struct attribute_group md_redundancy_group;
684 void mddev_unlock(struct mddev *mddev)
686 if (mddev->to_remove) {
687 /* These cannot be removed under reconfig_mutex as
688 * an access to the files will try to take reconfig_mutex
689 * while holding the file unremovable, which leads to
691 * So hold set sysfs_active while the remove in happeing,
692 * and anything else which might set ->to_remove or my
693 * otherwise change the sysfs namespace will fail with
694 * -EBUSY if sysfs_active is still set.
695 * We set sysfs_active under reconfig_mutex and elsewhere
696 * test it under the same mutex to ensure its correct value
699 struct attribute_group *to_remove = mddev->to_remove;
700 mddev->to_remove = NULL;
701 mddev->sysfs_active = 1;
702 mutex_unlock(&mddev->reconfig_mutex);
704 if (mddev->kobj.sd) {
705 if (to_remove != &md_redundancy_group)
706 sysfs_remove_group(&mddev->kobj, to_remove);
707 if (mddev->pers == NULL ||
708 mddev->pers->sync_request == NULL) {
709 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
710 if (mddev->sysfs_action)
711 sysfs_put(mddev->sysfs_action);
712 mddev->sysfs_action = NULL;
715 mddev->sysfs_active = 0;
717 mutex_unlock(&mddev->reconfig_mutex);
719 /* As we've dropped the mutex we need a spinlock to
720 * make sure the thread doesn't disappear
722 spin_lock(&pers_lock);
723 md_wakeup_thread(mddev->thread);
724 wake_up(&mddev->sb_wait);
725 spin_unlock(&pers_lock);
727 EXPORT_SYMBOL_GPL(mddev_unlock);
729 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
731 struct md_rdev *rdev;
733 rdev_for_each_rcu(rdev, mddev)
734 if (rdev->desc_nr == nr)
739 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
741 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
743 struct md_rdev *rdev;
745 rdev_for_each(rdev, mddev)
746 if (rdev->bdev->bd_dev == dev)
752 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
754 struct md_rdev *rdev;
756 rdev_for_each_rcu(rdev, mddev)
757 if (rdev->bdev->bd_dev == dev)
762 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
764 static struct md_personality *find_pers(int level, char *clevel)
766 struct md_personality *pers;
767 list_for_each_entry(pers, &pers_list, list) {
768 if (level != LEVEL_NONE && pers->level == level)
770 if (strcmp(pers->name, clevel)==0)
776 /* return the offset of the super block in 512byte sectors */
777 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
779 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
780 return MD_NEW_SIZE_SECTORS(num_sectors);
783 static int alloc_disk_sb(struct md_rdev *rdev)
785 rdev->sb_page = alloc_page(GFP_KERNEL);
791 void md_rdev_clear(struct md_rdev *rdev)
794 put_page(rdev->sb_page);
796 rdev->sb_page = NULL;
801 put_page(rdev->bb_page);
802 rdev->bb_page = NULL;
804 badblocks_exit(&rdev->badblocks);
806 EXPORT_SYMBOL_GPL(md_rdev_clear);
808 static void super_written(struct bio *bio)
810 struct md_rdev *rdev = bio->bi_private;
811 struct mddev *mddev = rdev->mddev;
813 if (bio->bi_status) {
814 pr_err("md: super_written gets error=%d\n", bio->bi_status);
815 md_error(mddev, rdev);
816 if (!test_bit(Faulty, &rdev->flags)
817 && (bio->bi_opf & MD_FAILFAST)) {
818 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
819 set_bit(LastDev, &rdev->flags);
822 clear_bit(LastDev, &rdev->flags);
824 if (atomic_dec_and_test(&mddev->pending_writes))
825 wake_up(&mddev->sb_wait);
826 rdev_dec_pending(rdev, mddev);
830 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
831 sector_t sector, int size, struct page *page)
833 /* write first size bytes of page to sector of rdev
834 * Increment mddev->pending_writes before returning
835 * and decrement it on completion, waking up sb_wait
836 * if zero is reached.
837 * If an error occurred, call md_error
845 if (test_bit(Faulty, &rdev->flags))
848 bio = md_bio_alloc_sync(mddev);
850 atomic_inc(&rdev->nr_pending);
852 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
853 bio->bi_iter.bi_sector = sector;
854 bio_add_page(bio, page, size, 0);
855 bio->bi_private = rdev;
856 bio->bi_end_io = super_written;
858 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
859 test_bit(FailFast, &rdev->flags) &&
860 !test_bit(LastDev, &rdev->flags))
862 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
864 atomic_inc(&mddev->pending_writes);
868 int md_super_wait(struct mddev *mddev)
870 /* wait for all superblock writes that were scheduled to complete */
871 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
872 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
877 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
878 struct page *page, int op, int op_flags, bool metadata_op)
880 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
883 if (metadata_op && rdev->meta_bdev)
884 bio_set_dev(bio, rdev->meta_bdev);
886 bio_set_dev(bio, rdev->bdev);
887 bio_set_op_attrs(bio, op, op_flags);
889 bio->bi_iter.bi_sector = sector + rdev->sb_start;
890 else if (rdev->mddev->reshape_position != MaxSector &&
891 (rdev->mddev->reshape_backwards ==
892 (sector >= rdev->mddev->reshape_position)))
893 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
895 bio->bi_iter.bi_sector = sector + rdev->data_offset;
896 bio_add_page(bio, page, size, 0);
898 submit_bio_wait(bio);
900 ret = !bio->bi_status;
904 EXPORT_SYMBOL_GPL(sync_page_io);
906 static int read_disk_sb(struct md_rdev *rdev, int size)
908 char b[BDEVNAME_SIZE];
913 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
919 pr_err("md: disabled device %s, could not read superblock.\n",
920 bdevname(rdev->bdev,b));
924 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
926 return sb1->set_uuid0 == sb2->set_uuid0 &&
927 sb1->set_uuid1 == sb2->set_uuid1 &&
928 sb1->set_uuid2 == sb2->set_uuid2 &&
929 sb1->set_uuid3 == sb2->set_uuid3;
932 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
935 mdp_super_t *tmp1, *tmp2;
937 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
938 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
940 if (!tmp1 || !tmp2) {
949 * nr_disks is not constant
954 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
961 static u32 md_csum_fold(u32 csum)
963 csum = (csum & 0xffff) + (csum >> 16);
964 return (csum & 0xffff) + (csum >> 16);
967 static unsigned int calc_sb_csum(mdp_super_t *sb)
970 u32 *sb32 = (u32*)sb;
972 unsigned int disk_csum, csum;
974 disk_csum = sb->sb_csum;
977 for (i = 0; i < MD_SB_BYTES/4 ; i++)
979 csum = (newcsum & 0xffffffff) + (newcsum>>32);
982 /* This used to use csum_partial, which was wrong for several
983 * reasons including that different results are returned on
984 * different architectures. It isn't critical that we get exactly
985 * the same return value as before (we always csum_fold before
986 * testing, and that removes any differences). However as we
987 * know that csum_partial always returned a 16bit value on
988 * alphas, do a fold to maximise conformity to previous behaviour.
990 sb->sb_csum = md_csum_fold(disk_csum);
992 sb->sb_csum = disk_csum;
998 * Handle superblock details.
999 * We want to be able to handle multiple superblock formats
1000 * so we have a common interface to them all, and an array of
1001 * different handlers.
1002 * We rely on user-space to write the initial superblock, and support
1003 * reading and updating of superblocks.
1004 * Interface methods are:
1005 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1006 * loads and validates a superblock on dev.
1007 * if refdev != NULL, compare superblocks on both devices
1009 * 0 - dev has a superblock that is compatible with refdev
1010 * 1 - dev has a superblock that is compatible and newer than refdev
1011 * so dev should be used as the refdev in future
1012 * -EINVAL superblock incompatible or invalid
1013 * -othererror e.g. -EIO
1015 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1016 * Verify that dev is acceptable into mddev.
1017 * The first time, mddev->raid_disks will be 0, and data from
1018 * dev should be merged in. Subsequent calls check that dev
1019 * is new enough. Return 0 or -EINVAL
1021 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1022 * Update the superblock for rdev with data in mddev
1023 * This does not write to disc.
1029 struct module *owner;
1030 int (*load_super)(struct md_rdev *rdev,
1031 struct md_rdev *refdev,
1033 int (*validate_super)(struct mddev *mddev,
1034 struct md_rdev *rdev);
1035 void (*sync_super)(struct mddev *mddev,
1036 struct md_rdev *rdev);
1037 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1038 sector_t num_sectors);
1039 int (*allow_new_offset)(struct md_rdev *rdev,
1040 unsigned long long new_offset);
1044 * Check that the given mddev has no bitmap.
1046 * This function is called from the run method of all personalities that do not
1047 * support bitmaps. It prints an error message and returns non-zero if mddev
1048 * has a bitmap. Otherwise, it returns 0.
1051 int md_check_no_bitmap(struct mddev *mddev)
1053 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1055 pr_warn("%s: bitmaps are not supported for %s\n",
1056 mdname(mddev), mddev->pers->name);
1059 EXPORT_SYMBOL(md_check_no_bitmap);
1062 * load_super for 0.90.0
1064 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1066 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1071 * Calculate the position of the superblock (512byte sectors),
1072 * it's at the end of the disk.
1074 * It also happens to be a multiple of 4Kb.
1076 rdev->sb_start = calc_dev_sboffset(rdev);
1078 ret = read_disk_sb(rdev, MD_SB_BYTES);
1084 bdevname(rdev->bdev, b);
1085 sb = page_address(rdev->sb_page);
1087 if (sb->md_magic != MD_SB_MAGIC) {
1088 pr_warn("md: invalid raid superblock magic on %s\n", b);
1092 if (sb->major_version != 0 ||
1093 sb->minor_version < 90 ||
1094 sb->minor_version > 91) {
1095 pr_warn("Bad version number %d.%d on %s\n",
1096 sb->major_version, sb->minor_version, b);
1100 if (sb->raid_disks <= 0)
1103 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1104 pr_warn("md: invalid superblock checksum on %s\n", b);
1108 rdev->preferred_minor = sb->md_minor;
1109 rdev->data_offset = 0;
1110 rdev->new_data_offset = 0;
1111 rdev->sb_size = MD_SB_BYTES;
1112 rdev->badblocks.shift = -1;
1114 if (sb->level == LEVEL_MULTIPATH)
1117 rdev->desc_nr = sb->this_disk.number;
1123 mdp_super_t *refsb = page_address(refdev->sb_page);
1124 if (!md_uuid_equal(refsb, sb)) {
1125 pr_warn("md: %s has different UUID to %s\n",
1126 b, bdevname(refdev->bdev,b2));
1129 if (!md_sb_equal(refsb, sb)) {
1130 pr_warn("md: %s has same UUID but different superblock to %s\n",
1131 b, bdevname(refdev->bdev, b2));
1135 ev2 = md_event(refsb);
1141 rdev->sectors = rdev->sb_start;
1142 /* Limit to 4TB as metadata cannot record more than that.
1143 * (not needed for Linear and RAID0 as metadata doesn't
1146 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1148 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1150 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1151 /* "this cannot possibly happen" ... */
1159 * validate_super for 0.90.0
1161 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1164 mdp_super_t *sb = page_address(rdev->sb_page);
1165 __u64 ev1 = md_event(sb);
1167 rdev->raid_disk = -1;
1168 clear_bit(Faulty, &rdev->flags);
1169 clear_bit(In_sync, &rdev->flags);
1170 clear_bit(Bitmap_sync, &rdev->flags);
1171 clear_bit(WriteMostly, &rdev->flags);
1173 if (mddev->raid_disks == 0) {
1174 mddev->major_version = 0;
1175 mddev->minor_version = sb->minor_version;
1176 mddev->patch_version = sb->patch_version;
1177 mddev->external = 0;
1178 mddev->chunk_sectors = sb->chunk_size >> 9;
1179 mddev->ctime = sb->ctime;
1180 mddev->utime = sb->utime;
1181 mddev->level = sb->level;
1182 mddev->clevel[0] = 0;
1183 mddev->layout = sb->layout;
1184 mddev->raid_disks = sb->raid_disks;
1185 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1186 mddev->events = ev1;
1187 mddev->bitmap_info.offset = 0;
1188 mddev->bitmap_info.space = 0;
1189 /* bitmap can use 60 K after the 4K superblocks */
1190 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1191 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1192 mddev->reshape_backwards = 0;
1194 if (mddev->minor_version >= 91) {
1195 mddev->reshape_position = sb->reshape_position;
1196 mddev->delta_disks = sb->delta_disks;
1197 mddev->new_level = sb->new_level;
1198 mddev->new_layout = sb->new_layout;
1199 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1200 if (mddev->delta_disks < 0)
1201 mddev->reshape_backwards = 1;
1203 mddev->reshape_position = MaxSector;
1204 mddev->delta_disks = 0;
1205 mddev->new_level = mddev->level;
1206 mddev->new_layout = mddev->layout;
1207 mddev->new_chunk_sectors = mddev->chunk_sectors;
1209 if (mddev->level == 0)
1212 if (sb->state & (1<<MD_SB_CLEAN))
1213 mddev->recovery_cp = MaxSector;
1215 if (sb->events_hi == sb->cp_events_hi &&
1216 sb->events_lo == sb->cp_events_lo) {
1217 mddev->recovery_cp = sb->recovery_cp;
1219 mddev->recovery_cp = 0;
1222 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1223 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1224 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1225 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1227 mddev->max_disks = MD_SB_DISKS;
1229 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1230 mddev->bitmap_info.file == NULL) {
1231 mddev->bitmap_info.offset =
1232 mddev->bitmap_info.default_offset;
1233 mddev->bitmap_info.space =
1234 mddev->bitmap_info.default_space;
1237 } else if (mddev->pers == NULL) {
1238 /* Insist on good event counter while assembling, except
1239 * for spares (which don't need an event count) */
1241 if (sb->disks[rdev->desc_nr].state & (
1242 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1243 if (ev1 < mddev->events)
1245 } else if (mddev->bitmap) {
1246 /* if adding to array with a bitmap, then we can accept an
1247 * older device ... but not too old.
1249 if (ev1 < mddev->bitmap->events_cleared)
1251 if (ev1 < mddev->events)
1252 set_bit(Bitmap_sync, &rdev->flags);
1254 if (ev1 < mddev->events)
1255 /* just a hot-add of a new device, leave raid_disk at -1 */
1259 if (mddev->level != LEVEL_MULTIPATH) {
1260 desc = sb->disks + rdev->desc_nr;
1262 if (desc->state & (1<<MD_DISK_FAULTY))
1263 set_bit(Faulty, &rdev->flags);
1264 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1265 desc->raid_disk < mddev->raid_disks */) {
1266 set_bit(In_sync, &rdev->flags);
1267 rdev->raid_disk = desc->raid_disk;
1268 rdev->saved_raid_disk = desc->raid_disk;
1269 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1270 /* active but not in sync implies recovery up to
1271 * reshape position. We don't know exactly where
1272 * that is, so set to zero for now */
1273 if (mddev->minor_version >= 91) {
1274 rdev->recovery_offset = 0;
1275 rdev->raid_disk = desc->raid_disk;
1278 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1279 set_bit(WriteMostly, &rdev->flags);
1280 if (desc->state & (1<<MD_DISK_FAILFAST))
1281 set_bit(FailFast, &rdev->flags);
1282 } else /* MULTIPATH are always insync */
1283 set_bit(In_sync, &rdev->flags);
1288 * sync_super for 0.90.0
1290 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1293 struct md_rdev *rdev2;
1294 int next_spare = mddev->raid_disks;
1296 /* make rdev->sb match mddev data..
1299 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1300 * 3/ any empty disks < next_spare become removed
1302 * disks[0] gets initialised to REMOVED because
1303 * we cannot be sure from other fields if it has
1304 * been initialised or not.
1307 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1309 rdev->sb_size = MD_SB_BYTES;
1311 sb = page_address(rdev->sb_page);
1313 memset(sb, 0, sizeof(*sb));
1315 sb->md_magic = MD_SB_MAGIC;
1316 sb->major_version = mddev->major_version;
1317 sb->patch_version = mddev->patch_version;
1318 sb->gvalid_words = 0; /* ignored */
1319 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1320 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1321 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1322 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1324 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1325 sb->level = mddev->level;
1326 sb->size = mddev->dev_sectors / 2;
1327 sb->raid_disks = mddev->raid_disks;
1328 sb->md_minor = mddev->md_minor;
1329 sb->not_persistent = 0;
1330 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1332 sb->events_hi = (mddev->events>>32);
1333 sb->events_lo = (u32)mddev->events;
1335 if (mddev->reshape_position == MaxSector)
1336 sb->minor_version = 90;
1338 sb->minor_version = 91;
1339 sb->reshape_position = mddev->reshape_position;
1340 sb->new_level = mddev->new_level;
1341 sb->delta_disks = mddev->delta_disks;
1342 sb->new_layout = mddev->new_layout;
1343 sb->new_chunk = mddev->new_chunk_sectors << 9;
1345 mddev->minor_version = sb->minor_version;
1348 sb->recovery_cp = mddev->recovery_cp;
1349 sb->cp_events_hi = (mddev->events>>32);
1350 sb->cp_events_lo = (u32)mddev->events;
1351 if (mddev->recovery_cp == MaxSector)
1352 sb->state = (1<< MD_SB_CLEAN);
1354 sb->recovery_cp = 0;
1356 sb->layout = mddev->layout;
1357 sb->chunk_size = mddev->chunk_sectors << 9;
1359 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1360 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1362 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1363 rdev_for_each(rdev2, mddev) {
1366 int is_active = test_bit(In_sync, &rdev2->flags);
1368 if (rdev2->raid_disk >= 0 &&
1369 sb->minor_version >= 91)
1370 /* we have nowhere to store the recovery_offset,
1371 * but if it is not below the reshape_position,
1372 * we can piggy-back on that.
1375 if (rdev2->raid_disk < 0 ||
1376 test_bit(Faulty, &rdev2->flags))
1379 desc_nr = rdev2->raid_disk;
1381 desc_nr = next_spare++;
1382 rdev2->desc_nr = desc_nr;
1383 d = &sb->disks[rdev2->desc_nr];
1385 d->number = rdev2->desc_nr;
1386 d->major = MAJOR(rdev2->bdev->bd_dev);
1387 d->minor = MINOR(rdev2->bdev->bd_dev);
1389 d->raid_disk = rdev2->raid_disk;
1391 d->raid_disk = rdev2->desc_nr; /* compatibility */
1392 if (test_bit(Faulty, &rdev2->flags))
1393 d->state = (1<<MD_DISK_FAULTY);
1394 else if (is_active) {
1395 d->state = (1<<MD_DISK_ACTIVE);
1396 if (test_bit(In_sync, &rdev2->flags))
1397 d->state |= (1<<MD_DISK_SYNC);
1405 if (test_bit(WriteMostly, &rdev2->flags))
1406 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1407 if (test_bit(FailFast, &rdev2->flags))
1408 d->state |= (1<<MD_DISK_FAILFAST);
1410 /* now set the "removed" and "faulty" bits on any missing devices */
1411 for (i=0 ; i < mddev->raid_disks ; i++) {
1412 mdp_disk_t *d = &sb->disks[i];
1413 if (d->state == 0 && d->number == 0) {
1416 d->state = (1<<MD_DISK_REMOVED);
1417 d->state |= (1<<MD_DISK_FAULTY);
1421 sb->nr_disks = nr_disks;
1422 sb->active_disks = active;
1423 sb->working_disks = working;
1424 sb->failed_disks = failed;
1425 sb->spare_disks = spare;
1427 sb->this_disk = sb->disks[rdev->desc_nr];
1428 sb->sb_csum = calc_sb_csum(sb);
1432 * rdev_size_change for 0.90.0
1434 static unsigned long long
1435 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1437 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1438 return 0; /* component must fit device */
1439 if (rdev->mddev->bitmap_info.offset)
1440 return 0; /* can't move bitmap */
1441 rdev->sb_start = calc_dev_sboffset(rdev);
1442 if (!num_sectors || num_sectors > rdev->sb_start)
1443 num_sectors = rdev->sb_start;
1444 /* Limit to 4TB as metadata cannot record more than that.
1445 * 4TB == 2^32 KB, or 2*2^32 sectors.
1447 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1448 rdev->mddev->level >= 1)
1449 num_sectors = (sector_t)(2ULL << 32) - 2;
1451 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1453 } while (md_super_wait(rdev->mddev) < 0);
1458 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1460 /* non-zero offset changes not possible with v0.90 */
1461 return new_offset == 0;
1465 * version 1 superblock
1468 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1472 unsigned long long newcsum;
1473 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1474 __le32 *isuper = (__le32*)sb;
1476 disk_csum = sb->sb_csum;
1479 for (; size >= 4; size -= 4)
1480 newcsum += le32_to_cpu(*isuper++);
1483 newcsum += le16_to_cpu(*(__le16*) isuper);
1485 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1486 sb->sb_csum = disk_csum;
1487 return cpu_to_le32(csum);
1490 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1492 struct mdp_superblock_1 *sb;
1496 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1500 * Calculate the position of the superblock in 512byte sectors.
1501 * It is always aligned to a 4K boundary and
1502 * depeding on minor_version, it can be:
1503 * 0: At least 8K, but less than 12K, from end of device
1504 * 1: At start of device
1505 * 2: 4K from start of device.
1507 switch(minor_version) {
1509 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1511 sb_start &= ~(sector_t)(4*2-1);
1522 rdev->sb_start = sb_start;
1524 /* superblock is rarely larger than 1K, but it can be larger,
1525 * and it is safe to read 4k, so we do that
1527 ret = read_disk_sb(rdev, 4096);
1528 if (ret) return ret;
1530 sb = page_address(rdev->sb_page);
1532 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1533 sb->major_version != cpu_to_le32(1) ||
1534 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1535 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1536 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1539 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1540 pr_warn("md: invalid superblock checksum on %s\n",
1541 bdevname(rdev->bdev,b));
1544 if (le64_to_cpu(sb->data_size) < 10) {
1545 pr_warn("md: data_size too small on %s\n",
1546 bdevname(rdev->bdev,b));
1551 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1552 /* Some padding is non-zero, might be a new feature */
1555 rdev->preferred_minor = 0xffff;
1556 rdev->data_offset = le64_to_cpu(sb->data_offset);
1557 rdev->new_data_offset = rdev->data_offset;
1558 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1559 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1560 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1561 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1563 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1564 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1565 if (rdev->sb_size & bmask)
1566 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1569 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1572 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1575 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1578 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1580 if (!rdev->bb_page) {
1581 rdev->bb_page = alloc_page(GFP_KERNEL);
1585 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1586 rdev->badblocks.count == 0) {
1587 /* need to load the bad block list.
1588 * Currently we limit it to one page.
1594 int sectors = le16_to_cpu(sb->bblog_size);
1595 if (sectors > (PAGE_SIZE / 512))
1597 offset = le32_to_cpu(sb->bblog_offset);
1600 bb_sector = (long long)offset;
1601 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1602 rdev->bb_page, REQ_OP_READ, 0, true))
1604 bbp = (u64 *)page_address(rdev->bb_page);
1605 rdev->badblocks.shift = sb->bblog_shift;
1606 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1607 u64 bb = le64_to_cpu(*bbp);
1608 int count = bb & (0x3ff);
1609 u64 sector = bb >> 10;
1610 sector <<= sb->bblog_shift;
1611 count <<= sb->bblog_shift;
1614 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1617 } else if (sb->bblog_offset != 0)
1618 rdev->badblocks.shift = 0;
1620 if ((le32_to_cpu(sb->feature_map) &
1621 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1622 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1623 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1624 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1627 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1635 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1637 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1638 sb->level != refsb->level ||
1639 sb->layout != refsb->layout ||
1640 sb->chunksize != refsb->chunksize) {
1641 pr_warn("md: %s has strangely different superblock to %s\n",
1642 bdevname(rdev->bdev,b),
1643 bdevname(refdev->bdev,b2));
1646 ev1 = le64_to_cpu(sb->events);
1647 ev2 = le64_to_cpu(refsb->events);
1654 if (minor_version) {
1655 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1656 sectors -= rdev->data_offset;
1658 sectors = rdev->sb_start;
1659 if (sectors < le64_to_cpu(sb->data_size))
1661 rdev->sectors = le64_to_cpu(sb->data_size);
1665 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1667 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1668 __u64 ev1 = le64_to_cpu(sb->events);
1670 rdev->raid_disk = -1;
1671 clear_bit(Faulty, &rdev->flags);
1672 clear_bit(In_sync, &rdev->flags);
1673 clear_bit(Bitmap_sync, &rdev->flags);
1674 clear_bit(WriteMostly, &rdev->flags);
1676 if (mddev->raid_disks == 0) {
1677 mddev->major_version = 1;
1678 mddev->patch_version = 0;
1679 mddev->external = 0;
1680 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1681 mddev->ctime = le64_to_cpu(sb->ctime);
1682 mddev->utime = le64_to_cpu(sb->utime);
1683 mddev->level = le32_to_cpu(sb->level);
1684 mddev->clevel[0] = 0;
1685 mddev->layout = le32_to_cpu(sb->layout);
1686 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1687 mddev->dev_sectors = le64_to_cpu(sb->size);
1688 mddev->events = ev1;
1689 mddev->bitmap_info.offset = 0;
1690 mddev->bitmap_info.space = 0;
1691 /* Default location for bitmap is 1K after superblock
1692 * using 3K - total of 4K
1694 mddev->bitmap_info.default_offset = 1024 >> 9;
1695 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1696 mddev->reshape_backwards = 0;
1698 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1699 memcpy(mddev->uuid, sb->set_uuid, 16);
1701 mddev->max_disks = (4096-256)/2;
1703 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1704 mddev->bitmap_info.file == NULL) {
1705 mddev->bitmap_info.offset =
1706 (__s32)le32_to_cpu(sb->bitmap_offset);
1707 /* Metadata doesn't record how much space is available.
1708 * For 1.0, we assume we can use up to the superblock
1709 * if before, else to 4K beyond superblock.
1710 * For others, assume no change is possible.
1712 if (mddev->minor_version > 0)
1713 mddev->bitmap_info.space = 0;
1714 else if (mddev->bitmap_info.offset > 0)
1715 mddev->bitmap_info.space =
1716 8 - mddev->bitmap_info.offset;
1718 mddev->bitmap_info.space =
1719 -mddev->bitmap_info.offset;
1722 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1723 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1724 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1725 mddev->new_level = le32_to_cpu(sb->new_level);
1726 mddev->new_layout = le32_to_cpu(sb->new_layout);
1727 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1728 if (mddev->delta_disks < 0 ||
1729 (mddev->delta_disks == 0 &&
1730 (le32_to_cpu(sb->feature_map)
1731 & MD_FEATURE_RESHAPE_BACKWARDS)))
1732 mddev->reshape_backwards = 1;
1734 mddev->reshape_position = MaxSector;
1735 mddev->delta_disks = 0;
1736 mddev->new_level = mddev->level;
1737 mddev->new_layout = mddev->layout;
1738 mddev->new_chunk_sectors = mddev->chunk_sectors;
1741 if (mddev->level == 0 &&
1742 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1745 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1746 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1748 if (le32_to_cpu(sb->feature_map) &
1749 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1750 if (le32_to_cpu(sb->feature_map) &
1751 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1753 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1754 (le32_to_cpu(sb->feature_map) &
1755 MD_FEATURE_MULTIPLE_PPLS))
1757 set_bit(MD_HAS_PPL, &mddev->flags);
1759 } else if (mddev->pers == NULL) {
1760 /* Insist of good event counter while assembling, except for
1761 * spares (which don't need an event count) */
1763 if (rdev->desc_nr >= 0 &&
1764 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1765 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1766 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1767 if (ev1 < mddev->events)
1769 } else if (mddev->bitmap) {
1770 /* If adding to array with a bitmap, then we can accept an
1771 * older device, but not too old.
1773 if (ev1 < mddev->bitmap->events_cleared)
1775 if (ev1 < mddev->events)
1776 set_bit(Bitmap_sync, &rdev->flags);
1778 if (ev1 < mddev->events)
1779 /* just a hot-add of a new device, leave raid_disk at -1 */
1782 if (mddev->level != LEVEL_MULTIPATH) {
1784 if (rdev->desc_nr < 0 ||
1785 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1786 role = MD_DISK_ROLE_SPARE;
1789 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1791 case MD_DISK_ROLE_SPARE: /* spare */
1793 case MD_DISK_ROLE_FAULTY: /* faulty */
1794 set_bit(Faulty, &rdev->flags);
1796 case MD_DISK_ROLE_JOURNAL: /* journal device */
1797 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1798 /* journal device without journal feature */
1799 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1802 set_bit(Journal, &rdev->flags);
1803 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1804 rdev->raid_disk = 0;
1807 rdev->saved_raid_disk = role;
1808 if ((le32_to_cpu(sb->feature_map) &
1809 MD_FEATURE_RECOVERY_OFFSET)) {
1810 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1811 if (!(le32_to_cpu(sb->feature_map) &
1812 MD_FEATURE_RECOVERY_BITMAP))
1813 rdev->saved_raid_disk = -1;
1816 * If the array is FROZEN, then the device can't
1817 * be in_sync with rest of array.
1819 if (!test_bit(MD_RECOVERY_FROZEN,
1821 set_bit(In_sync, &rdev->flags);
1823 rdev->raid_disk = role;
1826 if (sb->devflags & WriteMostly1)
1827 set_bit(WriteMostly, &rdev->flags);
1828 if (sb->devflags & FailFast1)
1829 set_bit(FailFast, &rdev->flags);
1830 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1831 set_bit(Replacement, &rdev->flags);
1832 } else /* MULTIPATH are always insync */
1833 set_bit(In_sync, &rdev->flags);
1838 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1840 struct mdp_superblock_1 *sb;
1841 struct md_rdev *rdev2;
1843 /* make rdev->sb match mddev and rdev data. */
1845 sb = page_address(rdev->sb_page);
1847 sb->feature_map = 0;
1849 sb->recovery_offset = cpu_to_le64(0);
1850 memset(sb->pad3, 0, sizeof(sb->pad3));
1852 sb->utime = cpu_to_le64((__u64)mddev->utime);
1853 sb->events = cpu_to_le64(mddev->events);
1855 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1856 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1857 sb->resync_offset = cpu_to_le64(MaxSector);
1859 sb->resync_offset = cpu_to_le64(0);
1861 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1863 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1864 sb->size = cpu_to_le64(mddev->dev_sectors);
1865 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1866 sb->level = cpu_to_le32(mddev->level);
1867 sb->layout = cpu_to_le32(mddev->layout);
1868 if (test_bit(FailFast, &rdev->flags))
1869 sb->devflags |= FailFast1;
1871 sb->devflags &= ~FailFast1;
1873 if (test_bit(WriteMostly, &rdev->flags))
1874 sb->devflags |= WriteMostly1;
1876 sb->devflags &= ~WriteMostly1;
1877 sb->data_offset = cpu_to_le64(rdev->data_offset);
1878 sb->data_size = cpu_to_le64(rdev->sectors);
1880 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1881 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1882 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1885 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1886 !test_bit(In_sync, &rdev->flags)) {
1888 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1889 sb->recovery_offset =
1890 cpu_to_le64(rdev->recovery_offset);
1891 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1893 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1895 /* Note: recovery_offset and journal_tail share space */
1896 if (test_bit(Journal, &rdev->flags))
1897 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1898 if (test_bit(Replacement, &rdev->flags))
1900 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1902 if (mddev->reshape_position != MaxSector) {
1903 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1904 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1905 sb->new_layout = cpu_to_le32(mddev->new_layout);
1906 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1907 sb->new_level = cpu_to_le32(mddev->new_level);
1908 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1909 if (mddev->delta_disks == 0 &&
1910 mddev->reshape_backwards)
1912 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1913 if (rdev->new_data_offset != rdev->data_offset) {
1915 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1916 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1917 - rdev->data_offset));
1921 if (mddev_is_clustered(mddev))
1922 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1924 if (rdev->badblocks.count == 0)
1925 /* Nothing to do for bad blocks*/ ;
1926 else if (sb->bblog_offset == 0)
1927 /* Cannot record bad blocks on this device */
1928 md_error(mddev, rdev);
1930 struct badblocks *bb = &rdev->badblocks;
1931 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1933 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1938 seq = read_seqbegin(&bb->lock);
1940 memset(bbp, 0xff, PAGE_SIZE);
1942 for (i = 0 ; i < bb->count ; i++) {
1943 u64 internal_bb = p[i];
1944 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1945 | BB_LEN(internal_bb));
1946 bbp[i] = cpu_to_le64(store_bb);
1949 if (read_seqretry(&bb->lock, seq))
1952 bb->sector = (rdev->sb_start +
1953 (int)le32_to_cpu(sb->bblog_offset));
1954 bb->size = le16_to_cpu(sb->bblog_size);
1959 rdev_for_each(rdev2, mddev)
1960 if (rdev2->desc_nr+1 > max_dev)
1961 max_dev = rdev2->desc_nr+1;
1963 if (max_dev > le32_to_cpu(sb->max_dev)) {
1965 sb->max_dev = cpu_to_le32(max_dev);
1966 rdev->sb_size = max_dev * 2 + 256;
1967 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1968 if (rdev->sb_size & bmask)
1969 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1971 max_dev = le32_to_cpu(sb->max_dev);
1973 for (i=0; i<max_dev;i++)
1974 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1976 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1977 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1979 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
1980 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
1982 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
1984 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
1985 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
1986 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
1989 rdev_for_each(rdev2, mddev) {
1991 if (test_bit(Faulty, &rdev2->flags))
1992 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1993 else if (test_bit(In_sync, &rdev2->flags))
1994 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1995 else if (test_bit(Journal, &rdev2->flags))
1996 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1997 else if (rdev2->raid_disk >= 0)
1998 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2000 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2003 sb->sb_csum = calc_sb_1_csum(sb);
2006 static unsigned long long
2007 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2009 struct mdp_superblock_1 *sb;
2010 sector_t max_sectors;
2011 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2012 return 0; /* component must fit device */
2013 if (rdev->data_offset != rdev->new_data_offset)
2014 return 0; /* too confusing */
2015 if (rdev->sb_start < rdev->data_offset) {
2016 /* minor versions 1 and 2; superblock before data */
2017 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2018 max_sectors -= rdev->data_offset;
2019 if (!num_sectors || num_sectors > max_sectors)
2020 num_sectors = max_sectors;
2021 } else if (rdev->mddev->bitmap_info.offset) {
2022 /* minor version 0 with bitmap we can't move */
2025 /* minor version 0; superblock after data */
2027 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
2028 sb_start &= ~(sector_t)(4*2 - 1);
2029 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
2030 if (!num_sectors || num_sectors > max_sectors)
2031 num_sectors = max_sectors;
2032 rdev->sb_start = sb_start;
2034 sb = page_address(rdev->sb_page);
2035 sb->data_size = cpu_to_le64(num_sectors);
2036 sb->super_offset = cpu_to_le64(rdev->sb_start);
2037 sb->sb_csum = calc_sb_1_csum(sb);
2039 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2041 } while (md_super_wait(rdev->mddev) < 0);
2047 super_1_allow_new_offset(struct md_rdev *rdev,
2048 unsigned long long new_offset)
2050 /* All necessary checks on new >= old have been done */
2051 struct bitmap *bitmap;
2052 if (new_offset >= rdev->data_offset)
2055 /* with 1.0 metadata, there is no metadata to tread on
2056 * so we can always move back */
2057 if (rdev->mddev->minor_version == 0)
2060 /* otherwise we must be sure not to step on
2061 * any metadata, so stay:
2062 * 36K beyond start of superblock
2063 * beyond end of badblocks
2064 * beyond write-intent bitmap
2066 if (rdev->sb_start + (32+4)*2 > new_offset)
2068 bitmap = rdev->mddev->bitmap;
2069 if (bitmap && !rdev->mddev->bitmap_info.file &&
2070 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2071 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2073 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2079 static struct super_type super_types[] = {
2082 .owner = THIS_MODULE,
2083 .load_super = super_90_load,
2084 .validate_super = super_90_validate,
2085 .sync_super = super_90_sync,
2086 .rdev_size_change = super_90_rdev_size_change,
2087 .allow_new_offset = super_90_allow_new_offset,
2091 .owner = THIS_MODULE,
2092 .load_super = super_1_load,
2093 .validate_super = super_1_validate,
2094 .sync_super = super_1_sync,
2095 .rdev_size_change = super_1_rdev_size_change,
2096 .allow_new_offset = super_1_allow_new_offset,
2100 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2102 if (mddev->sync_super) {
2103 mddev->sync_super(mddev, rdev);
2107 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2109 super_types[mddev->major_version].sync_super(mddev, rdev);
2112 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2114 struct md_rdev *rdev, *rdev2;
2117 rdev_for_each_rcu(rdev, mddev1) {
2118 if (test_bit(Faulty, &rdev->flags) ||
2119 test_bit(Journal, &rdev->flags) ||
2120 rdev->raid_disk == -1)
2122 rdev_for_each_rcu(rdev2, mddev2) {
2123 if (test_bit(Faulty, &rdev2->flags) ||
2124 test_bit(Journal, &rdev2->flags) ||
2125 rdev2->raid_disk == -1)
2127 if (rdev->bdev->bd_contains ==
2128 rdev2->bdev->bd_contains) {
2138 static LIST_HEAD(pending_raid_disks);
2141 * Try to register data integrity profile for an mddev
2143 * This is called when an array is started and after a disk has been kicked
2144 * from the array. It only succeeds if all working and active component devices
2145 * are integrity capable with matching profiles.
2147 int md_integrity_register(struct mddev *mddev)
2149 struct md_rdev *rdev, *reference = NULL;
2151 if (list_empty(&mddev->disks))
2152 return 0; /* nothing to do */
2153 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2154 return 0; /* shouldn't register, or already is */
2155 rdev_for_each(rdev, mddev) {
2156 /* skip spares and non-functional disks */
2157 if (test_bit(Faulty, &rdev->flags))
2159 if (rdev->raid_disk < 0)
2162 /* Use the first rdev as the reference */
2166 /* does this rdev's profile match the reference profile? */
2167 if (blk_integrity_compare(reference->bdev->bd_disk,
2168 rdev->bdev->bd_disk) < 0)
2171 if (!reference || !bdev_get_integrity(reference->bdev))
2174 * All component devices are integrity capable and have matching
2175 * profiles, register the common profile for the md device.
2177 blk_integrity_register(mddev->gendisk,
2178 bdev_get_integrity(reference->bdev));
2180 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2181 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2182 pr_err("md: failed to create integrity pool for %s\n",
2188 EXPORT_SYMBOL(md_integrity_register);
2191 * Attempt to add an rdev, but only if it is consistent with the current
2194 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2196 struct blk_integrity *bi_rdev;
2197 struct blk_integrity *bi_mddev;
2198 char name[BDEVNAME_SIZE];
2200 if (!mddev->gendisk)
2203 bi_rdev = bdev_get_integrity(rdev->bdev);
2204 bi_mddev = blk_get_integrity(mddev->gendisk);
2206 if (!bi_mddev) /* nothing to do */
2209 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2210 pr_err("%s: incompatible integrity profile for %s\n",
2211 mdname(mddev), bdevname(rdev->bdev, name));
2217 EXPORT_SYMBOL(md_integrity_add_rdev);
2219 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2221 char b[BDEVNAME_SIZE];
2225 /* prevent duplicates */
2226 if (find_rdev(mddev, rdev->bdev->bd_dev))
2229 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2233 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2234 if (!test_bit(Journal, &rdev->flags) &&
2236 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2238 /* Cannot change size, so fail
2239 * If mddev->level <= 0, then we don't care
2240 * about aligning sizes (e.g. linear)
2242 if (mddev->level > 0)
2245 mddev->dev_sectors = rdev->sectors;
2248 /* Verify rdev->desc_nr is unique.
2249 * If it is -1, assign a free number, else
2250 * check number is not in use
2253 if (rdev->desc_nr < 0) {
2256 choice = mddev->raid_disks;
2257 while (md_find_rdev_nr_rcu(mddev, choice))
2259 rdev->desc_nr = choice;
2261 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2267 if (!test_bit(Journal, &rdev->flags) &&
2268 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2269 pr_warn("md: %s: array is limited to %d devices\n",
2270 mdname(mddev), mddev->max_disks);
2273 bdevname(rdev->bdev,b);
2274 strreplace(b, '/', '!');
2276 rdev->mddev = mddev;
2277 pr_debug("md: bind<%s>\n", b);
2279 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2282 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2283 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2284 /* failure here is OK */;
2285 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2287 list_add_rcu(&rdev->same_set, &mddev->disks);
2288 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2290 /* May as well allow recovery to be retried once */
2291 mddev->recovery_disabled++;
2296 pr_warn("md: failed to register dev-%s for %s\n",
2301 static void md_delayed_delete(struct work_struct *ws)
2303 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2304 kobject_del(&rdev->kobj);
2305 kobject_put(&rdev->kobj);
2308 static void unbind_rdev_from_array(struct md_rdev *rdev)
2310 char b[BDEVNAME_SIZE];
2312 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2313 list_del_rcu(&rdev->same_set);
2314 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2316 sysfs_remove_link(&rdev->kobj, "block");
2317 sysfs_put(rdev->sysfs_state);
2318 rdev->sysfs_state = NULL;
2319 rdev->badblocks.count = 0;
2320 /* We need to delay this, otherwise we can deadlock when
2321 * writing to 'remove' to "dev/state". We also need
2322 * to delay it due to rcu usage.
2325 INIT_WORK(&rdev->del_work, md_delayed_delete);
2326 kobject_get(&rdev->kobj);
2327 queue_work(md_misc_wq, &rdev->del_work);
2331 * prevent the device from being mounted, repartitioned or
2332 * otherwise reused by a RAID array (or any other kernel
2333 * subsystem), by bd_claiming the device.
2335 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2338 struct block_device *bdev;
2339 char b[BDEVNAME_SIZE];
2341 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2342 shared ? (struct md_rdev *)lock_rdev : rdev);
2344 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2345 return PTR_ERR(bdev);
2351 static void unlock_rdev(struct md_rdev *rdev)
2353 struct block_device *bdev = rdev->bdev;
2355 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2358 void md_autodetect_dev(dev_t dev);
2360 static void export_rdev(struct md_rdev *rdev)
2362 char b[BDEVNAME_SIZE];
2364 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2365 md_rdev_clear(rdev);
2367 if (test_bit(AutoDetected, &rdev->flags))
2368 md_autodetect_dev(rdev->bdev->bd_dev);
2371 kobject_put(&rdev->kobj);
2374 void md_kick_rdev_from_array(struct md_rdev *rdev)
2376 unbind_rdev_from_array(rdev);
2379 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2381 static void export_array(struct mddev *mddev)
2383 struct md_rdev *rdev;
2385 while (!list_empty(&mddev->disks)) {
2386 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2388 md_kick_rdev_from_array(rdev);
2390 mddev->raid_disks = 0;
2391 mddev->major_version = 0;
2394 static bool set_in_sync(struct mddev *mddev)
2396 lockdep_assert_held(&mddev->lock);
2397 if (!mddev->in_sync) {
2398 mddev->sync_checkers++;
2399 spin_unlock(&mddev->lock);
2400 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2401 spin_lock(&mddev->lock);
2402 if (!mddev->in_sync &&
2403 percpu_ref_is_zero(&mddev->writes_pending)) {
2406 * Ensure ->in_sync is visible before we clear
2410 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2411 sysfs_notify_dirent_safe(mddev->sysfs_state);
2413 if (--mddev->sync_checkers == 0)
2414 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2416 if (mddev->safemode == 1)
2417 mddev->safemode = 0;
2418 return mddev->in_sync;
2421 static void sync_sbs(struct mddev *mddev, int nospares)
2423 /* Update each superblock (in-memory image), but
2424 * if we are allowed to, skip spares which already
2425 * have the right event counter, or have one earlier
2426 * (which would mean they aren't being marked as dirty
2427 * with the rest of the array)
2429 struct md_rdev *rdev;
2430 rdev_for_each(rdev, mddev) {
2431 if (rdev->sb_events == mddev->events ||
2433 rdev->raid_disk < 0 &&
2434 rdev->sb_events+1 == mddev->events)) {
2435 /* Don't update this superblock */
2436 rdev->sb_loaded = 2;
2438 sync_super(mddev, rdev);
2439 rdev->sb_loaded = 1;
2444 static bool does_sb_need_changing(struct mddev *mddev)
2446 struct md_rdev *rdev;
2447 struct mdp_superblock_1 *sb;
2450 /* Find a good rdev */
2451 rdev_for_each(rdev, mddev)
2452 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2455 /* No good device found. */
2459 sb = page_address(rdev->sb_page);
2460 /* Check if a device has become faulty or a spare become active */
2461 rdev_for_each(rdev, mddev) {
2462 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2463 /* Device activated? */
2464 if (role == 0xffff && rdev->raid_disk >=0 &&
2465 !test_bit(Faulty, &rdev->flags))
2467 /* Device turned faulty? */
2468 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2472 /* Check if any mddev parameters have changed */
2473 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2474 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2475 (mddev->layout != le32_to_cpu(sb->layout)) ||
2476 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2477 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2483 void md_update_sb(struct mddev *mddev, int force_change)
2485 struct md_rdev *rdev;
2488 int any_badblocks_changed = 0;
2493 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2498 if (mddev_is_clustered(mddev)) {
2499 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2501 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2503 ret = md_cluster_ops->metadata_update_start(mddev);
2504 /* Has someone else has updated the sb */
2505 if (!does_sb_need_changing(mddev)) {
2507 md_cluster_ops->metadata_update_cancel(mddev);
2508 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2509 BIT(MD_SB_CHANGE_DEVS) |
2510 BIT(MD_SB_CHANGE_CLEAN));
2516 * First make sure individual recovery_offsets are correct
2517 * curr_resync_completed can only be used during recovery.
2518 * During reshape/resync it might use array-addresses rather
2519 * that device addresses.
2521 rdev_for_each(rdev, mddev) {
2522 if (rdev->raid_disk >= 0 &&
2523 mddev->delta_disks >= 0 &&
2524 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2525 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2526 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2527 !test_bit(Journal, &rdev->flags) &&
2528 !test_bit(In_sync, &rdev->flags) &&
2529 mddev->curr_resync_completed > rdev->recovery_offset)
2530 rdev->recovery_offset = mddev->curr_resync_completed;
2533 if (!mddev->persistent) {
2534 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2535 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2536 if (!mddev->external) {
2537 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2538 rdev_for_each(rdev, mddev) {
2539 if (rdev->badblocks.changed) {
2540 rdev->badblocks.changed = 0;
2541 ack_all_badblocks(&rdev->badblocks);
2542 md_error(mddev, rdev);
2544 clear_bit(Blocked, &rdev->flags);
2545 clear_bit(BlockedBadBlocks, &rdev->flags);
2546 wake_up(&rdev->blocked_wait);
2549 wake_up(&mddev->sb_wait);
2553 spin_lock(&mddev->lock);
2555 mddev->utime = ktime_get_real_seconds();
2557 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2559 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2560 /* just a clean<-> dirty transition, possibly leave spares alone,
2561 * though if events isn't the right even/odd, we will have to do
2567 if (mddev->degraded)
2568 /* If the array is degraded, then skipping spares is both
2569 * dangerous and fairly pointless.
2570 * Dangerous because a device that was removed from the array
2571 * might have a event_count that still looks up-to-date,
2572 * so it can be re-added without a resync.
2573 * Pointless because if there are any spares to skip,
2574 * then a recovery will happen and soon that array won't
2575 * be degraded any more and the spare can go back to sleep then.
2579 sync_req = mddev->in_sync;
2581 /* If this is just a dirty<->clean transition, and the array is clean
2582 * and 'events' is odd, we can roll back to the previous clean state */
2584 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2585 && mddev->can_decrease_events
2586 && mddev->events != 1) {
2588 mddev->can_decrease_events = 0;
2590 /* otherwise we have to go forward and ... */
2592 mddev->can_decrease_events = nospares;
2596 * This 64-bit counter should never wrap.
2597 * Either we are in around ~1 trillion A.C., assuming
2598 * 1 reboot per second, or we have a bug...
2600 WARN_ON(mddev->events == 0);
2602 rdev_for_each(rdev, mddev) {
2603 if (rdev->badblocks.changed)
2604 any_badblocks_changed++;
2605 if (test_bit(Faulty, &rdev->flags))
2606 set_bit(FaultRecorded, &rdev->flags);
2609 sync_sbs(mddev, nospares);
2610 spin_unlock(&mddev->lock);
2612 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2613 mdname(mddev), mddev->in_sync);
2616 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2618 md_bitmap_update_sb(mddev->bitmap);
2619 rdev_for_each(rdev, mddev) {
2620 char b[BDEVNAME_SIZE];
2622 if (rdev->sb_loaded != 1)
2623 continue; /* no noise on spare devices */
2625 if (!test_bit(Faulty, &rdev->flags)) {
2626 md_super_write(mddev,rdev,
2627 rdev->sb_start, rdev->sb_size,
2629 pr_debug("md: (write) %s's sb offset: %llu\n",
2630 bdevname(rdev->bdev, b),
2631 (unsigned long long)rdev->sb_start);
2632 rdev->sb_events = mddev->events;
2633 if (rdev->badblocks.size) {
2634 md_super_write(mddev, rdev,
2635 rdev->badblocks.sector,
2636 rdev->badblocks.size << 9,
2638 rdev->badblocks.size = 0;
2642 pr_debug("md: %s (skipping faulty)\n",
2643 bdevname(rdev->bdev, b));
2645 if (mddev->level == LEVEL_MULTIPATH)
2646 /* only need to write one superblock... */
2649 if (md_super_wait(mddev) < 0)
2651 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2653 if (mddev_is_clustered(mddev) && ret == 0)
2654 md_cluster_ops->metadata_update_finish(mddev);
2656 if (mddev->in_sync != sync_req ||
2657 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2658 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2659 /* have to write it out again */
2661 wake_up(&mddev->sb_wait);
2662 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2663 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2665 rdev_for_each(rdev, mddev) {
2666 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2667 clear_bit(Blocked, &rdev->flags);
2669 if (any_badblocks_changed)
2670 ack_all_badblocks(&rdev->badblocks);
2671 clear_bit(BlockedBadBlocks, &rdev->flags);
2672 wake_up(&rdev->blocked_wait);
2675 EXPORT_SYMBOL(md_update_sb);
2677 static int add_bound_rdev(struct md_rdev *rdev)
2679 struct mddev *mddev = rdev->mddev;
2681 bool add_journal = test_bit(Journal, &rdev->flags);
2683 if (!mddev->pers->hot_remove_disk || add_journal) {
2684 /* If there is hot_add_disk but no hot_remove_disk
2685 * then added disks for geometry changes,
2686 * and should be added immediately.
2688 super_types[mddev->major_version].
2689 validate_super(mddev, rdev);
2691 mddev_suspend(mddev);
2692 err = mddev->pers->hot_add_disk(mddev, rdev);
2694 mddev_resume(mddev);
2696 md_kick_rdev_from_array(rdev);
2700 sysfs_notify_dirent_safe(rdev->sysfs_state);
2702 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2703 if (mddev->degraded)
2704 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2705 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2706 md_new_event(mddev);
2707 md_wakeup_thread(mddev->thread);
2711 /* words written to sysfs files may, or may not, be \n terminated.
2712 * We want to accept with case. For this we use cmd_match.
2714 static int cmd_match(const char *cmd, const char *str)
2716 /* See if cmd, written into a sysfs file, matches
2717 * str. They must either be the same, or cmd can
2718 * have a trailing newline
2720 while (*cmd && *str && *cmd == *str) {
2731 struct rdev_sysfs_entry {
2732 struct attribute attr;
2733 ssize_t (*show)(struct md_rdev *, char *);
2734 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2738 state_show(struct md_rdev *rdev, char *page)
2742 unsigned long flags = READ_ONCE(rdev->flags);
2744 if (test_bit(Faulty, &flags) ||
2745 (!test_bit(ExternalBbl, &flags) &&
2746 rdev->badblocks.unacked_exist))
2747 len += sprintf(page+len, "faulty%s", sep);
2748 if (test_bit(In_sync, &flags))
2749 len += sprintf(page+len, "in_sync%s", sep);
2750 if (test_bit(Journal, &flags))
2751 len += sprintf(page+len, "journal%s", sep);
2752 if (test_bit(WriteMostly, &flags))
2753 len += sprintf(page+len, "write_mostly%s", sep);
2754 if (test_bit(Blocked, &flags) ||
2755 (rdev->badblocks.unacked_exist
2756 && !test_bit(Faulty, &flags)))
2757 len += sprintf(page+len, "blocked%s", sep);
2758 if (!test_bit(Faulty, &flags) &&
2759 !test_bit(Journal, &flags) &&
2760 !test_bit(In_sync, &flags))
2761 len += sprintf(page+len, "spare%s", sep);
2762 if (test_bit(WriteErrorSeen, &flags))
2763 len += sprintf(page+len, "write_error%s", sep);
2764 if (test_bit(WantReplacement, &flags))
2765 len += sprintf(page+len, "want_replacement%s", sep);
2766 if (test_bit(Replacement, &flags))
2767 len += sprintf(page+len, "replacement%s", sep);
2768 if (test_bit(ExternalBbl, &flags))
2769 len += sprintf(page+len, "external_bbl%s", sep);
2770 if (test_bit(FailFast, &flags))
2771 len += sprintf(page+len, "failfast%s", sep);
2776 return len+sprintf(page+len, "\n");
2780 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2783 * faulty - simulates an error
2784 * remove - disconnects the device
2785 * writemostly - sets write_mostly
2786 * -writemostly - clears write_mostly
2787 * blocked - sets the Blocked flags
2788 * -blocked - clears the Blocked and possibly simulates an error
2789 * insync - sets Insync providing device isn't active
2790 * -insync - clear Insync for a device with a slot assigned,
2791 * so that it gets rebuilt based on bitmap
2792 * write_error - sets WriteErrorSeen
2793 * -write_error - clears WriteErrorSeen
2794 * {,-}failfast - set/clear FailFast
2797 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2798 md_error(rdev->mddev, rdev);
2799 if (test_bit(Faulty, &rdev->flags))
2803 } else if (cmd_match(buf, "remove")) {
2804 if (rdev->mddev->pers) {
2805 clear_bit(Blocked, &rdev->flags);
2806 remove_and_add_spares(rdev->mddev, rdev);
2808 if (rdev->raid_disk >= 0)
2811 struct mddev *mddev = rdev->mddev;
2813 if (mddev_is_clustered(mddev))
2814 err = md_cluster_ops->remove_disk(mddev, rdev);
2817 md_kick_rdev_from_array(rdev);
2819 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2820 md_wakeup_thread(mddev->thread);
2822 md_new_event(mddev);
2825 } else if (cmd_match(buf, "writemostly")) {
2826 set_bit(WriteMostly, &rdev->flags);
2828 } else if (cmd_match(buf, "-writemostly")) {
2829 clear_bit(WriteMostly, &rdev->flags);
2831 } else if (cmd_match(buf, "blocked")) {
2832 set_bit(Blocked, &rdev->flags);
2834 } else if (cmd_match(buf, "-blocked")) {
2835 if (!test_bit(Faulty, &rdev->flags) &&
2836 !test_bit(ExternalBbl, &rdev->flags) &&
2837 rdev->badblocks.unacked_exist) {
2838 /* metadata handler doesn't understand badblocks,
2839 * so we need to fail the device
2841 md_error(rdev->mddev, rdev);
2843 clear_bit(Blocked, &rdev->flags);
2844 clear_bit(BlockedBadBlocks, &rdev->flags);
2845 wake_up(&rdev->blocked_wait);
2846 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2847 md_wakeup_thread(rdev->mddev->thread);
2850 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2851 set_bit(In_sync, &rdev->flags);
2853 } else if (cmd_match(buf, "failfast")) {
2854 set_bit(FailFast, &rdev->flags);
2856 } else if (cmd_match(buf, "-failfast")) {
2857 clear_bit(FailFast, &rdev->flags);
2859 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2860 !test_bit(Journal, &rdev->flags)) {
2861 if (rdev->mddev->pers == NULL) {
2862 clear_bit(In_sync, &rdev->flags);
2863 rdev->saved_raid_disk = rdev->raid_disk;
2864 rdev->raid_disk = -1;
2867 } else if (cmd_match(buf, "write_error")) {
2868 set_bit(WriteErrorSeen, &rdev->flags);
2870 } else if (cmd_match(buf, "-write_error")) {
2871 clear_bit(WriteErrorSeen, &rdev->flags);
2873 } else if (cmd_match(buf, "want_replacement")) {
2874 /* Any non-spare device that is not a replacement can
2875 * become want_replacement at any time, but we then need to
2876 * check if recovery is needed.
2878 if (rdev->raid_disk >= 0 &&
2879 !test_bit(Journal, &rdev->flags) &&
2880 !test_bit(Replacement, &rdev->flags))
2881 set_bit(WantReplacement, &rdev->flags);
2882 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2883 md_wakeup_thread(rdev->mddev->thread);
2885 } else if (cmd_match(buf, "-want_replacement")) {
2886 /* Clearing 'want_replacement' is always allowed.
2887 * Once replacements starts it is too late though.
2890 clear_bit(WantReplacement, &rdev->flags);
2891 } else if (cmd_match(buf, "replacement")) {
2892 /* Can only set a device as a replacement when array has not
2893 * yet been started. Once running, replacement is automatic
2894 * from spares, or by assigning 'slot'.
2896 if (rdev->mddev->pers)
2899 set_bit(Replacement, &rdev->flags);
2902 } else if (cmd_match(buf, "-replacement")) {
2903 /* Similarly, can only clear Replacement before start */
2904 if (rdev->mddev->pers)
2907 clear_bit(Replacement, &rdev->flags);
2910 } else if (cmd_match(buf, "re-add")) {
2911 if (!rdev->mddev->pers)
2913 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2914 rdev->saved_raid_disk >= 0) {
2915 /* clear_bit is performed _after_ all the devices
2916 * have their local Faulty bit cleared. If any writes
2917 * happen in the meantime in the local node, they
2918 * will land in the local bitmap, which will be synced
2919 * by this node eventually
2921 if (!mddev_is_clustered(rdev->mddev) ||
2922 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2923 clear_bit(Faulty, &rdev->flags);
2924 err = add_bound_rdev(rdev);
2928 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2929 set_bit(ExternalBbl, &rdev->flags);
2930 rdev->badblocks.shift = 0;
2932 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2933 clear_bit(ExternalBbl, &rdev->flags);
2937 sysfs_notify_dirent_safe(rdev->sysfs_state);
2938 return err ? err : len;
2940 static struct rdev_sysfs_entry rdev_state =
2941 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2944 errors_show(struct md_rdev *rdev, char *page)
2946 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2950 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2955 rv = kstrtouint(buf, 10, &n);
2958 atomic_set(&rdev->corrected_errors, n);
2961 static struct rdev_sysfs_entry rdev_errors =
2962 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2965 slot_show(struct md_rdev *rdev, char *page)
2967 if (test_bit(Journal, &rdev->flags))
2968 return sprintf(page, "journal\n");
2969 else if (rdev->raid_disk < 0)
2970 return sprintf(page, "none\n");
2972 return sprintf(page, "%d\n", rdev->raid_disk);
2976 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2981 if (test_bit(Journal, &rdev->flags))
2983 if (strncmp(buf, "none", 4)==0)
2986 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2990 if (rdev->mddev->pers && slot == -1) {
2991 /* Setting 'slot' on an active array requires also
2992 * updating the 'rd%d' link, and communicating
2993 * with the personality with ->hot_*_disk.
2994 * For now we only support removing
2995 * failed/spare devices. This normally happens automatically,
2996 * but not when the metadata is externally managed.
2998 if (rdev->raid_disk == -1)
3000 /* personality does all needed checks */
3001 if (rdev->mddev->pers->hot_remove_disk == NULL)
3003 clear_bit(Blocked, &rdev->flags);
3004 remove_and_add_spares(rdev->mddev, rdev);
3005 if (rdev->raid_disk >= 0)
3007 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3008 md_wakeup_thread(rdev->mddev->thread);
3009 } else if (rdev->mddev->pers) {
3010 /* Activating a spare .. or possibly reactivating
3011 * if we ever get bitmaps working here.
3015 if (rdev->raid_disk != -1)
3018 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3021 if (rdev->mddev->pers->hot_add_disk == NULL)
3024 if (slot >= rdev->mddev->raid_disks &&
3025 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3028 rdev->raid_disk = slot;
3029 if (test_bit(In_sync, &rdev->flags))
3030 rdev->saved_raid_disk = slot;
3032 rdev->saved_raid_disk = -1;
3033 clear_bit(In_sync, &rdev->flags);
3034 clear_bit(Bitmap_sync, &rdev->flags);
3035 err = rdev->mddev->pers->
3036 hot_add_disk(rdev->mddev, rdev);
3038 rdev->raid_disk = -1;
3041 sysfs_notify_dirent_safe(rdev->sysfs_state);
3042 if (sysfs_link_rdev(rdev->mddev, rdev))
3043 /* failure here is OK */;
3044 /* don't wakeup anyone, leave that to userspace. */
3046 if (slot >= rdev->mddev->raid_disks &&
3047 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3049 rdev->raid_disk = slot;
3050 /* assume it is working */
3051 clear_bit(Faulty, &rdev->flags);
3052 clear_bit(WriteMostly, &rdev->flags);
3053 set_bit(In_sync, &rdev->flags);
3054 sysfs_notify_dirent_safe(rdev->sysfs_state);
3059 static struct rdev_sysfs_entry rdev_slot =
3060 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3063 offset_show(struct md_rdev *rdev, char *page)
3065 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3069 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3071 unsigned long long offset;
3072 if (kstrtoull(buf, 10, &offset) < 0)
3074 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3076 if (rdev->sectors && rdev->mddev->external)
3077 /* Must set offset before size, so overlap checks
3080 rdev->data_offset = offset;
3081 rdev->new_data_offset = offset;
3085 static struct rdev_sysfs_entry rdev_offset =
3086 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3088 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3090 return sprintf(page, "%llu\n",
3091 (unsigned long long)rdev->new_data_offset);
3094 static ssize_t new_offset_store(struct md_rdev *rdev,
3095 const char *buf, size_t len)
3097 unsigned long long new_offset;
3098 struct mddev *mddev = rdev->mddev;
3100 if (kstrtoull(buf, 10, &new_offset) < 0)
3103 if (mddev->sync_thread ||
3104 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3106 if (new_offset == rdev->data_offset)
3107 /* reset is always permitted */
3109 else if (new_offset > rdev->data_offset) {
3110 /* must not push array size beyond rdev_sectors */
3111 if (new_offset - rdev->data_offset
3112 + mddev->dev_sectors > rdev->sectors)
3115 /* Metadata worries about other space details. */
3117 /* decreasing the offset is inconsistent with a backwards
3120 if (new_offset < rdev->data_offset &&
3121 mddev->reshape_backwards)
3123 /* Increasing offset is inconsistent with forwards
3124 * reshape. reshape_direction should be set to
3125 * 'backwards' first.
3127 if (new_offset > rdev->data_offset &&
3128 !mddev->reshape_backwards)
3131 if (mddev->pers && mddev->persistent &&
3132 !super_types[mddev->major_version]
3133 .allow_new_offset(rdev, new_offset))
3135 rdev->new_data_offset = new_offset;
3136 if (new_offset > rdev->data_offset)
3137 mddev->reshape_backwards = 1;
3138 else if (new_offset < rdev->data_offset)
3139 mddev->reshape_backwards = 0;
3143 static struct rdev_sysfs_entry rdev_new_offset =
3144 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3147 rdev_size_show(struct md_rdev *rdev, char *page)
3149 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3152 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3154 /* check if two start/length pairs overlap */
3162 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3164 unsigned long long blocks;
3167 if (kstrtoull(buf, 10, &blocks) < 0)
3170 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3171 return -EINVAL; /* sector conversion overflow */
3174 if (new != blocks * 2)
3175 return -EINVAL; /* unsigned long long to sector_t overflow */
3182 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3184 struct mddev *my_mddev = rdev->mddev;
3185 sector_t oldsectors = rdev->sectors;
3188 if (test_bit(Journal, &rdev->flags))
3190 if (strict_blocks_to_sectors(buf, §ors) < 0)
3192 if (rdev->data_offset != rdev->new_data_offset)
3193 return -EINVAL; /* too confusing */
3194 if (my_mddev->pers && rdev->raid_disk >= 0) {
3195 if (my_mddev->persistent) {
3196 sectors = super_types[my_mddev->major_version].
3197 rdev_size_change(rdev, sectors);
3200 } else if (!sectors)
3201 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3203 if (!my_mddev->pers->resize)
3204 /* Cannot change size for RAID0 or Linear etc */
3207 if (sectors < my_mddev->dev_sectors)
3208 return -EINVAL; /* component must fit device */
3210 rdev->sectors = sectors;
3211 if (sectors > oldsectors && my_mddev->external) {
3212 /* Need to check that all other rdevs with the same
3213 * ->bdev do not overlap. 'rcu' is sufficient to walk
3214 * the rdev lists safely.
3215 * This check does not provide a hard guarantee, it
3216 * just helps avoid dangerous mistakes.
3218 struct mddev *mddev;
3220 struct list_head *tmp;
3223 for_each_mddev(mddev, tmp) {
3224 struct md_rdev *rdev2;
3226 rdev_for_each(rdev2, mddev)
3227 if (rdev->bdev == rdev2->bdev &&
3229 overlaps(rdev->data_offset, rdev->sectors,
3242 /* Someone else could have slipped in a size
3243 * change here, but doing so is just silly.
3244 * We put oldsectors back because we *know* it is
3245 * safe, and trust userspace not to race with
3248 rdev->sectors = oldsectors;
3255 static struct rdev_sysfs_entry rdev_size =
3256 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3258 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3260 unsigned long long recovery_start = rdev->recovery_offset;
3262 if (test_bit(In_sync, &rdev->flags) ||
3263 recovery_start == MaxSector)
3264 return sprintf(page, "none\n");
3266 return sprintf(page, "%llu\n", recovery_start);
3269 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3271 unsigned long long recovery_start;
3273 if (cmd_match(buf, "none"))
3274 recovery_start = MaxSector;
3275 else if (kstrtoull(buf, 10, &recovery_start))
3278 if (rdev->mddev->pers &&
3279 rdev->raid_disk >= 0)
3282 rdev->recovery_offset = recovery_start;
3283 if (recovery_start == MaxSector)
3284 set_bit(In_sync, &rdev->flags);
3286 clear_bit(In_sync, &rdev->flags);
3290 static struct rdev_sysfs_entry rdev_recovery_start =
3291 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3293 /* sysfs access to bad-blocks list.
3294 * We present two files.
3295 * 'bad-blocks' lists sector numbers and lengths of ranges that
3296 * are recorded as bad. The list is truncated to fit within
3297 * the one-page limit of sysfs.
3298 * Writing "sector length" to this file adds an acknowledged
3300 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3301 * been acknowledged. Writing to this file adds bad blocks
3302 * without acknowledging them. This is largely for testing.
3304 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3306 return badblocks_show(&rdev->badblocks, page, 0);
3308 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3310 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3311 /* Maybe that ack was all we needed */
3312 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3313 wake_up(&rdev->blocked_wait);
3316 static struct rdev_sysfs_entry rdev_bad_blocks =
3317 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3319 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3321 return badblocks_show(&rdev->badblocks, page, 1);
3323 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3325 return badblocks_store(&rdev->badblocks, page, len, 1);
3327 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3328 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3331 ppl_sector_show(struct md_rdev *rdev, char *page)
3333 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3337 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3339 unsigned long long sector;
3341 if (kstrtoull(buf, 10, §or) < 0)
3343 if (sector != (sector_t)sector)
3346 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3347 rdev->raid_disk >= 0)
3350 if (rdev->mddev->persistent) {
3351 if (rdev->mddev->major_version == 0)
3353 if ((sector > rdev->sb_start &&
3354 sector - rdev->sb_start > S16_MAX) ||
3355 (sector < rdev->sb_start &&
3356 rdev->sb_start - sector > -S16_MIN))
3358 rdev->ppl.offset = sector - rdev->sb_start;
3359 } else if (!rdev->mddev->external) {
3362 rdev->ppl.sector = sector;
3366 static struct rdev_sysfs_entry rdev_ppl_sector =
3367 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3370 ppl_size_show(struct md_rdev *rdev, char *page)
3372 return sprintf(page, "%u\n", rdev->ppl.size);
3376 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3380 if (kstrtouint(buf, 10, &size) < 0)
3383 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3384 rdev->raid_disk >= 0)
3387 if (rdev->mddev->persistent) {
3388 if (rdev->mddev->major_version == 0)
3392 } else if (!rdev->mddev->external) {
3395 rdev->ppl.size = size;
3399 static struct rdev_sysfs_entry rdev_ppl_size =
3400 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3402 static struct attribute *rdev_default_attrs[] = {
3407 &rdev_new_offset.attr,
3409 &rdev_recovery_start.attr,
3410 &rdev_bad_blocks.attr,
3411 &rdev_unack_bad_blocks.attr,
3412 &rdev_ppl_sector.attr,
3413 &rdev_ppl_size.attr,
3417 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3419 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3420 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3426 return entry->show(rdev, page);
3430 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3431 const char *page, size_t length)
3433 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3434 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3436 struct mddev *mddev = rdev->mddev;
3440 if (!capable(CAP_SYS_ADMIN))
3442 rv = mddev ? mddev_lock(mddev): -EBUSY;
3444 if (rdev->mddev == NULL)
3447 rv = entry->store(rdev, page, length);
3448 mddev_unlock(mddev);
3453 static void rdev_free(struct kobject *ko)
3455 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3458 static const struct sysfs_ops rdev_sysfs_ops = {
3459 .show = rdev_attr_show,
3460 .store = rdev_attr_store,
3462 static struct kobj_type rdev_ktype = {
3463 .release = rdev_free,
3464 .sysfs_ops = &rdev_sysfs_ops,
3465 .default_attrs = rdev_default_attrs,
3468 int md_rdev_init(struct md_rdev *rdev)
3471 rdev->saved_raid_disk = -1;
3472 rdev->raid_disk = -1;
3474 rdev->data_offset = 0;
3475 rdev->new_data_offset = 0;
3476 rdev->sb_events = 0;
3477 rdev->last_read_error = 0;
3478 rdev->sb_loaded = 0;
3479 rdev->bb_page = NULL;
3480 atomic_set(&rdev->nr_pending, 0);
3481 atomic_set(&rdev->read_errors, 0);
3482 atomic_set(&rdev->corrected_errors, 0);
3484 INIT_LIST_HEAD(&rdev->same_set);
3485 init_waitqueue_head(&rdev->blocked_wait);
3487 /* Add space to store bad block list.
3488 * This reserves the space even on arrays where it cannot
3489 * be used - I wonder if that matters
3491 return badblocks_init(&rdev->badblocks, 0);
3493 EXPORT_SYMBOL_GPL(md_rdev_init);
3495 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3497 * mark the device faulty if:
3499 * - the device is nonexistent (zero size)
3500 * - the device has no valid superblock
3502 * a faulty rdev _never_ has rdev->sb set.
3504 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3506 char b[BDEVNAME_SIZE];
3508 struct md_rdev *rdev;
3511 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3513 return ERR_PTR(-ENOMEM);
3515 err = md_rdev_init(rdev);
3518 err = alloc_disk_sb(rdev);
3522 err = lock_rdev(rdev, newdev, super_format == -2);
3526 kobject_init(&rdev->kobj, &rdev_ktype);
3528 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3530 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3531 bdevname(rdev->bdev,b));
3536 if (super_format >= 0) {
3537 err = super_types[super_format].
3538 load_super(rdev, NULL, super_minor);
3539 if (err == -EINVAL) {
3540 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3541 bdevname(rdev->bdev,b),
3542 super_format, super_minor);
3546 pr_warn("md: could not read %s's sb, not importing!\n",
3547 bdevname(rdev->bdev,b));
3557 md_rdev_clear(rdev);
3559 return ERR_PTR(err);
3563 * Check a full RAID array for plausibility
3566 static void analyze_sbs(struct mddev *mddev)
3569 struct md_rdev *rdev, *freshest, *tmp;
3570 char b[BDEVNAME_SIZE];
3573 rdev_for_each_safe(rdev, tmp, mddev)
3574 switch (super_types[mddev->major_version].
3575 load_super(rdev, freshest, mddev->minor_version)) {
3582 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3583 bdevname(rdev->bdev,b));
3584 md_kick_rdev_from_array(rdev);
3587 super_types[mddev->major_version].
3588 validate_super(mddev, freshest);
3591 rdev_for_each_safe(rdev, tmp, mddev) {
3592 if (mddev->max_disks &&
3593 (rdev->desc_nr >= mddev->max_disks ||
3594 i > mddev->max_disks)) {
3595 pr_warn("md: %s: %s: only %d devices permitted\n",
3596 mdname(mddev), bdevname(rdev->bdev, b),
3598 md_kick_rdev_from_array(rdev);
3601 if (rdev != freshest) {
3602 if (super_types[mddev->major_version].
3603 validate_super(mddev, rdev)) {
3604 pr_warn("md: kicking non-fresh %s from array!\n",
3605 bdevname(rdev->bdev,b));
3606 md_kick_rdev_from_array(rdev);
3610 if (mddev->level == LEVEL_MULTIPATH) {
3611 rdev->desc_nr = i++;
3612 rdev->raid_disk = rdev->desc_nr;
3613 set_bit(In_sync, &rdev->flags);
3614 } else if (rdev->raid_disk >=
3615 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3616 !test_bit(Journal, &rdev->flags)) {
3617 rdev->raid_disk = -1;
3618 clear_bit(In_sync, &rdev->flags);
3623 /* Read a fixed-point number.
3624 * Numbers in sysfs attributes should be in "standard" units where
3625 * possible, so time should be in seconds.
3626 * However we internally use a a much smaller unit such as
3627 * milliseconds or jiffies.
3628 * This function takes a decimal number with a possible fractional
3629 * component, and produces an integer which is the result of
3630 * multiplying that number by 10^'scale'.
3631 * all without any floating-point arithmetic.
3633 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3635 unsigned long result = 0;
3637 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3640 else if (decimals < scale) {
3643 result = result * 10 + value;
3655 while (decimals < scale) {
3664 safe_delay_show(struct mddev *mddev, char *page)
3666 int msec = (mddev->safemode_delay*1000)/HZ;
3667 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3670 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3674 if (mddev_is_clustered(mddev)) {
3675 pr_warn("md: Safemode is disabled for clustered mode\n");
3679 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3682 mddev->safemode_delay = 0;
3684 unsigned long old_delay = mddev->safemode_delay;
3685 unsigned long new_delay = (msec*HZ)/1000;
3689 mddev->safemode_delay = new_delay;
3690 if (new_delay < old_delay || old_delay == 0)
3691 mod_timer(&mddev->safemode_timer, jiffies+1);
3695 static struct md_sysfs_entry md_safe_delay =
3696 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3699 level_show(struct mddev *mddev, char *page)
3701 struct md_personality *p;
3703 spin_lock(&mddev->lock);
3706 ret = sprintf(page, "%s\n", p->name);
3707 else if (mddev->clevel[0])
3708 ret = sprintf(page, "%s\n", mddev->clevel);
3709 else if (mddev->level != LEVEL_NONE)
3710 ret = sprintf(page, "%d\n", mddev->level);
3713 spin_unlock(&mddev->lock);
3718 level_store(struct mddev *mddev, const char *buf, size_t len)
3723 struct md_personality *pers, *oldpers;
3725 void *priv, *oldpriv;
3726 struct md_rdev *rdev;
3728 if (slen == 0 || slen >= sizeof(clevel))
3731 rv = mddev_lock(mddev);
3735 if (mddev->pers == NULL) {
3736 strncpy(mddev->clevel, buf, slen);
3737 if (mddev->clevel[slen-1] == '\n')
3739 mddev->clevel[slen] = 0;
3740 mddev->level = LEVEL_NONE;
3748 /* request to change the personality. Need to ensure:
3749 * - array is not engaged in resync/recovery/reshape
3750 * - old personality can be suspended
3751 * - new personality will access other array.
3755 if (mddev->sync_thread ||
3756 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3757 mddev->reshape_position != MaxSector ||
3758 mddev->sysfs_active)
3762 if (!mddev->pers->quiesce) {
3763 pr_warn("md: %s: %s does not support online personality change\n",
3764 mdname(mddev), mddev->pers->name);
3768 /* Now find the new personality */
3769 strncpy(clevel, buf, slen);
3770 if (clevel[slen-1] == '\n')
3773 if (kstrtol(clevel, 10, &level))
3776 if (request_module("md-%s", clevel) != 0)
3777 request_module("md-level-%s", clevel);
3778 spin_lock(&pers_lock);
3779 pers = find_pers(level, clevel);
3780 if (!pers || !try_module_get(pers->owner)) {
3781 spin_unlock(&pers_lock);
3782 pr_warn("md: personality %s not loaded\n", clevel);
3786 spin_unlock(&pers_lock);
3788 if (pers == mddev->pers) {
3789 /* Nothing to do! */
3790 module_put(pers->owner);
3794 if (!pers->takeover) {
3795 module_put(pers->owner);
3796 pr_warn("md: %s: %s does not support personality takeover\n",
3797 mdname(mddev), clevel);
3802 rdev_for_each(rdev, mddev)
3803 rdev->new_raid_disk = rdev->raid_disk;
3805 /* ->takeover must set new_* and/or delta_disks
3806 * if it succeeds, and may set them when it fails.
3808 priv = pers->takeover(mddev);
3810 mddev->new_level = mddev->level;
3811 mddev->new_layout = mddev->layout;
3812 mddev->new_chunk_sectors = mddev->chunk_sectors;
3813 mddev->raid_disks -= mddev->delta_disks;
3814 mddev->delta_disks = 0;
3815 mddev->reshape_backwards = 0;
3816 module_put(pers->owner);
3817 pr_warn("md: %s: %s would not accept array\n",
3818 mdname(mddev), clevel);
3823 /* Looks like we have a winner */
3824 mddev_suspend(mddev);
3825 mddev_detach(mddev);
3827 spin_lock(&mddev->lock);
3828 oldpers = mddev->pers;
3829 oldpriv = mddev->private;
3831 mddev->private = priv;
3832 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3833 mddev->level = mddev->new_level;
3834 mddev->layout = mddev->new_layout;
3835 mddev->chunk_sectors = mddev->new_chunk_sectors;
3836 mddev->delta_disks = 0;
3837 mddev->reshape_backwards = 0;
3838 mddev->degraded = 0;
3839 spin_unlock(&mddev->lock);
3841 if (oldpers->sync_request == NULL &&
3843 /* We are converting from a no-redundancy array
3844 * to a redundancy array and metadata is managed
3845 * externally so we need to be sure that writes
3846 * won't block due to a need to transition
3848 * until external management is started.
3851 mddev->safemode_delay = 0;
3852 mddev->safemode = 0;
3855 oldpers->free(mddev, oldpriv);
3857 if (oldpers->sync_request == NULL &&
3858 pers->sync_request != NULL) {
3859 /* need to add the md_redundancy_group */
3860 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3861 pr_warn("md: cannot register extra attributes for %s\n",
3863 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3865 if (oldpers->sync_request != NULL &&
3866 pers->sync_request == NULL) {
3867 /* need to remove the md_redundancy_group */
3868 if (mddev->to_remove == NULL)
3869 mddev->to_remove = &md_redundancy_group;
3872 module_put(oldpers->owner);
3874 rdev_for_each(rdev, mddev) {
3875 if (rdev->raid_disk < 0)
3877 if (rdev->new_raid_disk >= mddev->raid_disks)
3878 rdev->new_raid_disk = -1;
3879 if (rdev->new_raid_disk == rdev->raid_disk)
3881 sysfs_unlink_rdev(mddev, rdev);
3883 rdev_for_each(rdev, mddev) {
3884 if (rdev->raid_disk < 0)
3886 if (rdev->new_raid_disk == rdev->raid_disk)
3888 rdev->raid_disk = rdev->new_raid_disk;
3889 if (rdev->raid_disk < 0)
3890 clear_bit(In_sync, &rdev->flags);
3892 if (sysfs_link_rdev(mddev, rdev))
3893 pr_warn("md: cannot register rd%d for %s after level change\n",
3894 rdev->raid_disk, mdname(mddev));
3898 if (pers->sync_request == NULL) {
3899 /* this is now an array without redundancy, so
3900 * it must always be in_sync
3903 del_timer_sync(&mddev->safemode_timer);
3905 blk_set_stacking_limits(&mddev->queue->limits);
3907 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3908 mddev_resume(mddev);
3910 md_update_sb(mddev, 1);
3911 sysfs_notify(&mddev->kobj, NULL, "level");
3912 md_new_event(mddev);
3915 mddev_unlock(mddev);
3919 static struct md_sysfs_entry md_level =
3920 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3923 layout_show(struct mddev *mddev, char *page)
3925 /* just a number, not meaningful for all levels */
3926 if (mddev->reshape_position != MaxSector &&
3927 mddev->layout != mddev->new_layout)
3928 return sprintf(page, "%d (%d)\n",
3929 mddev->new_layout, mddev->layout);
3930 return sprintf(page, "%d\n", mddev->layout);
3934 layout_store(struct mddev *mddev, const char *buf, size_t len)
3939 err = kstrtouint(buf, 10, &n);
3942 err = mddev_lock(mddev);
3947 if (mddev->pers->check_reshape == NULL)
3952 mddev->new_layout = n;
3953 err = mddev->pers->check_reshape(mddev);
3955 mddev->new_layout = mddev->layout;
3958 mddev->new_layout = n;
3959 if (mddev->reshape_position == MaxSector)
3962 mddev_unlock(mddev);
3965 static struct md_sysfs_entry md_layout =
3966 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3969 raid_disks_show(struct mddev *mddev, char *page)
3971 if (mddev->raid_disks == 0)
3973 if (mddev->reshape_position != MaxSector &&
3974 mddev->delta_disks != 0)
3975 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3976 mddev->raid_disks - mddev->delta_disks);
3977 return sprintf(page, "%d\n", mddev->raid_disks);
3980 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3983 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3988 err = kstrtouint(buf, 10, &n);
3992 err = mddev_lock(mddev);
3996 err = update_raid_disks(mddev, n);
3997 else if (mddev->reshape_position != MaxSector) {
3998 struct md_rdev *rdev;
3999 int olddisks = mddev->raid_disks - mddev->delta_disks;
4002 rdev_for_each(rdev, mddev) {
4004 rdev->data_offset < rdev->new_data_offset)
4007 rdev->data_offset > rdev->new_data_offset)
4011 mddev->delta_disks = n - olddisks;
4012 mddev->raid_disks = n;
4013 mddev->reshape_backwards = (mddev->delta_disks < 0);
4015 mddev->raid_disks = n;
4017 mddev_unlock(mddev);
4018 return err ? err : len;
4020 static struct md_sysfs_entry md_raid_disks =
4021 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4024 chunk_size_show(struct mddev *mddev, char *page)
4026 if (mddev->reshape_position != MaxSector &&
4027 mddev->chunk_sectors != mddev->new_chunk_sectors)
4028 return sprintf(page, "%d (%d)\n",
4029 mddev->new_chunk_sectors << 9,
4030 mddev->chunk_sectors << 9);
4031 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4035 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4040 err = kstrtoul(buf, 10, &n);
4044 err = mddev_lock(mddev);
4048 if (mddev->pers->check_reshape == NULL)
4053 mddev->new_chunk_sectors = n >> 9;
4054 err = mddev->pers->check_reshape(mddev);
4056 mddev->new_chunk_sectors = mddev->chunk_sectors;
4059 mddev->new_chunk_sectors = n >> 9;
4060 if (mddev->reshape_position == MaxSector)
4061 mddev->chunk_sectors = n >> 9;
4063 mddev_unlock(mddev);
4066 static struct md_sysfs_entry md_chunk_size =
4067 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4070 resync_start_show(struct mddev *mddev, char *page)
4072 if (mddev->recovery_cp == MaxSector)
4073 return sprintf(page, "none\n");
4074 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4078 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4080 unsigned long long n;
4083 if (cmd_match(buf, "none"))
4086 err = kstrtoull(buf, 10, &n);
4089 if (n != (sector_t)n)
4093 err = mddev_lock(mddev);
4096 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4100 mddev->recovery_cp = n;
4102 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4104 mddev_unlock(mddev);
4107 static struct md_sysfs_entry md_resync_start =
4108 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4109 resync_start_show, resync_start_store);
4112 * The array state can be:
4115 * No devices, no size, no level
4116 * Equivalent to STOP_ARRAY ioctl
4118 * May have some settings, but array is not active
4119 * all IO results in error
4120 * When written, doesn't tear down array, but just stops it
4121 * suspended (not supported yet)
4122 * All IO requests will block. The array can be reconfigured.
4123 * Writing this, if accepted, will block until array is quiescent
4125 * no resync can happen. no superblocks get written.
4126 * write requests fail
4128 * like readonly, but behaves like 'clean' on a write request.
4130 * clean - no pending writes, but otherwise active.
4131 * When written to inactive array, starts without resync
4132 * If a write request arrives then
4133 * if metadata is known, mark 'dirty' and switch to 'active'.
4134 * if not known, block and switch to write-pending
4135 * If written to an active array that has pending writes, then fails.
4137 * fully active: IO and resync can be happening.
4138 * When written to inactive array, starts with resync
4141 * clean, but writes are blocked waiting for 'active' to be written.
4144 * like active, but no writes have been seen for a while (100msec).
4147 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4148 write_pending, active_idle, bad_word};
4149 static char *array_states[] = {
4150 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4151 "write-pending", "active-idle", NULL };
4153 static int match_word(const char *word, char **list)
4156 for (n=0; list[n]; n++)
4157 if (cmd_match(word, list[n]))
4163 array_state_show(struct mddev *mddev, char *page)
4165 enum array_state st = inactive;
4167 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags))
4176 spin_lock(&mddev->lock);
4177 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4179 else if (mddev->in_sync)
4181 else if (mddev->safemode)
4185 spin_unlock(&mddev->lock);
4188 if (list_empty(&mddev->disks) &&
4189 mddev->raid_disks == 0 &&
4190 mddev->dev_sectors == 0)
4195 return sprintf(page, "%s\n", array_states[st]);
4198 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4199 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4200 static int do_md_run(struct mddev *mddev);
4201 static int restart_array(struct mddev *mddev);
4204 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4207 enum array_state st = match_word(buf, array_states);
4209 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4210 /* don't take reconfig_mutex when toggling between
4213 spin_lock(&mddev->lock);
4215 restart_array(mddev);
4216 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4217 md_wakeup_thread(mddev->thread);
4218 wake_up(&mddev->sb_wait);
4219 } else /* st == clean */ {
4220 restart_array(mddev);
4221 if (!set_in_sync(mddev))
4225 sysfs_notify_dirent_safe(mddev->sysfs_state);
4226 spin_unlock(&mddev->lock);
4229 err = mddev_lock(mddev);
4237 /* stopping an active array */
4238 err = do_md_stop(mddev, 0, NULL);
4241 /* stopping an active array */
4243 err = do_md_stop(mddev, 2, NULL);
4245 err = 0; /* already inactive */
4248 break; /* not supported yet */
4251 err = md_set_readonly(mddev, NULL);
4254 set_disk_ro(mddev->gendisk, 1);
4255 err = do_md_run(mddev);
4261 err = md_set_readonly(mddev, NULL);
4262 else if (mddev->ro == 1)
4263 err = restart_array(mddev);
4266 set_disk_ro(mddev->gendisk, 0);
4270 err = do_md_run(mddev);
4275 err = restart_array(mddev);
4278 spin_lock(&mddev->lock);
4279 if (!set_in_sync(mddev))
4281 spin_unlock(&mddev->lock);
4287 err = restart_array(mddev);
4290 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4291 wake_up(&mddev->sb_wait);
4295 set_disk_ro(mddev->gendisk, 0);
4296 err = do_md_run(mddev);
4301 /* these cannot be set */
4306 if (mddev->hold_active == UNTIL_IOCTL)
4307 mddev->hold_active = 0;
4308 sysfs_notify_dirent_safe(mddev->sysfs_state);
4310 mddev_unlock(mddev);
4313 static struct md_sysfs_entry md_array_state =
4314 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4317 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4318 return sprintf(page, "%d\n",
4319 atomic_read(&mddev->max_corr_read_errors));
4323 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4328 rv = kstrtouint(buf, 10, &n);
4331 atomic_set(&mddev->max_corr_read_errors, n);
4335 static struct md_sysfs_entry max_corr_read_errors =
4336 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4337 max_corrected_read_errors_store);
4340 null_show(struct mddev *mddev, char *page)
4346 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4348 /* buf must be %d:%d\n? giving major and minor numbers */
4349 /* The new device is added to the array.
4350 * If the array has a persistent superblock, we read the
4351 * superblock to initialise info and check validity.
4352 * Otherwise, only checking done is that in bind_rdev_to_array,
4353 * which mainly checks size.
4356 int major = simple_strtoul(buf, &e, 10);
4359 struct md_rdev *rdev;
4362 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4364 minor = simple_strtoul(e+1, &e, 10);
4365 if (*e && *e != '\n')
4367 dev = MKDEV(major, minor);
4368 if (major != MAJOR(dev) ||
4369 minor != MINOR(dev))
4372 flush_workqueue(md_misc_wq);
4374 err = mddev_lock(mddev);
4377 if (mddev->persistent) {
4378 rdev = md_import_device(dev, mddev->major_version,
4379 mddev->minor_version);
4380 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4381 struct md_rdev *rdev0
4382 = list_entry(mddev->disks.next,
4383 struct md_rdev, same_set);
4384 err = super_types[mddev->major_version]
4385 .load_super(rdev, rdev0, mddev->minor_version);
4389 } else if (mddev->external)
4390 rdev = md_import_device(dev, -2, -1);
4392 rdev = md_import_device(dev, -1, -1);
4395 mddev_unlock(mddev);
4396 return PTR_ERR(rdev);
4398 err = bind_rdev_to_array(rdev, mddev);
4402 mddev_unlock(mddev);
4404 md_new_event(mddev);
4405 return err ? err : len;
4408 static struct md_sysfs_entry md_new_device =
4409 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4412 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4415 unsigned long chunk, end_chunk;
4418 err = mddev_lock(mddev);
4423 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4425 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4426 if (buf == end) break;
4427 if (*end == '-') { /* range */
4429 end_chunk = simple_strtoul(buf, &end, 0);
4430 if (buf == end) break;
4432 if (*end && !isspace(*end)) break;
4433 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4434 buf = skip_spaces(end);
4436 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4438 mddev_unlock(mddev);
4442 static struct md_sysfs_entry md_bitmap =
4443 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4446 size_show(struct mddev *mddev, char *page)
4448 return sprintf(page, "%llu\n",
4449 (unsigned long long)mddev->dev_sectors / 2);
4452 static int update_size(struct mddev *mddev, sector_t num_sectors);
4455 size_store(struct mddev *mddev, const char *buf, size_t len)
4457 /* If array is inactive, we can reduce the component size, but
4458 * not increase it (except from 0).
4459 * If array is active, we can try an on-line resize
4462 int err = strict_blocks_to_sectors(buf, §ors);
4466 err = mddev_lock(mddev);
4470 err = update_size(mddev, sectors);
4472 md_update_sb(mddev, 1);
4474 if (mddev->dev_sectors == 0 ||
4475 mddev->dev_sectors > sectors)
4476 mddev->dev_sectors = sectors;
4480 mddev_unlock(mddev);
4481 return err ? err : len;
4484 static struct md_sysfs_entry md_size =
4485 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4487 /* Metadata version.
4489 * 'none' for arrays with no metadata (good luck...)
4490 * 'external' for arrays with externally managed metadata,
4491 * or N.M for internally known formats
4494 metadata_show(struct mddev *mddev, char *page)
4496 if (mddev->persistent)
4497 return sprintf(page, "%d.%d\n",
4498 mddev->major_version, mddev->minor_version);
4499 else if (mddev->external)
4500 return sprintf(page, "external:%s\n", mddev->metadata_type);
4502 return sprintf(page, "none\n");
4506 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4511 /* Changing the details of 'external' metadata is
4512 * always permitted. Otherwise there must be
4513 * no devices attached to the array.
4516 err = mddev_lock(mddev);
4520 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4522 else if (!list_empty(&mddev->disks))
4526 if (cmd_match(buf, "none")) {
4527 mddev->persistent = 0;
4528 mddev->external = 0;
4529 mddev->major_version = 0;
4530 mddev->minor_version = 90;
4533 if (strncmp(buf, "external:", 9) == 0) {
4534 size_t namelen = len-9;
4535 if (namelen >= sizeof(mddev->metadata_type))
4536 namelen = sizeof(mddev->metadata_type)-1;
4537 strncpy(mddev->metadata_type, buf+9, namelen);
4538 mddev->metadata_type[namelen] = 0;
4539 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4540 mddev->metadata_type[--namelen] = 0;
4541 mddev->persistent = 0;
4542 mddev->external = 1;
4543 mddev->major_version = 0;
4544 mddev->minor_version = 90;
4547 major = simple_strtoul(buf, &e, 10);
4549 if (e==buf || *e != '.')
4552 minor = simple_strtoul(buf, &e, 10);
4553 if (e==buf || (*e && *e != '\n') )
4556 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4558 mddev->major_version = major;
4559 mddev->minor_version = minor;
4560 mddev->persistent = 1;
4561 mddev->external = 0;
4564 mddev_unlock(mddev);
4568 static struct md_sysfs_entry md_metadata =
4569 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4572 action_show(struct mddev *mddev, char *page)
4574 char *type = "idle";
4575 unsigned long recovery = mddev->recovery;
4576 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4578 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4579 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4580 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4582 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4583 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4585 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4589 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4591 else if (mddev->reshape_position != MaxSector)
4594 return sprintf(page, "%s\n", type);
4598 action_store(struct mddev *mddev, const char *page, size_t len)
4600 if (!mddev->pers || !mddev->pers->sync_request)
4604 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4605 if (cmd_match(page, "frozen"))
4606 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4608 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4609 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4610 mddev_lock(mddev) == 0) {
4611 flush_workqueue(md_misc_wq);
4612 if (mddev->sync_thread) {
4613 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4614 md_reap_sync_thread(mddev);
4616 mddev_unlock(mddev);
4618 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4620 else if (cmd_match(page, "resync"))
4621 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4622 else if (cmd_match(page, "recover")) {
4623 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4624 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4625 } else if (cmd_match(page, "reshape")) {
4627 if (mddev->pers->start_reshape == NULL)
4629 err = mddev_lock(mddev);
4631 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4634 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4635 err = mddev->pers->start_reshape(mddev);
4637 mddev_unlock(mddev);
4641 sysfs_notify(&mddev->kobj, NULL, "degraded");
4643 if (cmd_match(page, "check"))
4644 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4645 else if (!cmd_match(page, "repair"))
4647 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4648 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4649 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4651 if (mddev->ro == 2) {
4652 /* A write to sync_action is enough to justify
4653 * canceling read-auto mode
4656 md_wakeup_thread(mddev->sync_thread);
4658 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4659 md_wakeup_thread(mddev->thread);
4660 sysfs_notify_dirent_safe(mddev->sysfs_action);
4664 static struct md_sysfs_entry md_scan_mode =
4665 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4668 last_sync_action_show(struct mddev *mddev, char *page)
4670 return sprintf(page, "%s\n", mddev->last_sync_action);
4673 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4676 mismatch_cnt_show(struct mddev *mddev, char *page)
4678 return sprintf(page, "%llu\n",
4679 (unsigned long long)
4680 atomic64_read(&mddev->resync_mismatches));
4683 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4686 sync_min_show(struct mddev *mddev, char *page)
4688 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4689 mddev->sync_speed_min ? "local": "system");
4693 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4698 if (strncmp(buf, "system", 6)==0) {
4701 rv = kstrtouint(buf, 10, &min);
4707 mddev->sync_speed_min = min;
4711 static struct md_sysfs_entry md_sync_min =
4712 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4715 sync_max_show(struct mddev *mddev, char *page)
4717 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4718 mddev->sync_speed_max ? "local": "system");
4722 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4727 if (strncmp(buf, "system", 6)==0) {
4730 rv = kstrtouint(buf, 10, &max);
4736 mddev->sync_speed_max = max;
4740 static struct md_sysfs_entry md_sync_max =
4741 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4744 degraded_show(struct mddev *mddev, char *page)
4746 return sprintf(page, "%d\n", mddev->degraded);
4748 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4751 sync_force_parallel_show(struct mddev *mddev, char *page)
4753 return sprintf(page, "%d\n", mddev->parallel_resync);
4757 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4761 if (kstrtol(buf, 10, &n))
4764 if (n != 0 && n != 1)
4767 mddev->parallel_resync = n;
4769 if (mddev->sync_thread)
4770 wake_up(&resync_wait);
4775 /* force parallel resync, even with shared block devices */
4776 static struct md_sysfs_entry md_sync_force_parallel =
4777 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4778 sync_force_parallel_show, sync_force_parallel_store);
4781 sync_speed_show(struct mddev *mddev, char *page)
4783 unsigned long resync, dt, db;
4784 if (mddev->curr_resync == 0)
4785 return sprintf(page, "none\n");
4786 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4787 dt = (jiffies - mddev->resync_mark) / HZ;
4789 db = resync - mddev->resync_mark_cnt;
4790 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4793 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4796 sync_completed_show(struct mddev *mddev, char *page)
4798 unsigned long long max_sectors, resync;
4800 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4801 return sprintf(page, "none\n");
4803 if (mddev->curr_resync == 1 ||
4804 mddev->curr_resync == 2)
4805 return sprintf(page, "delayed\n");
4807 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4808 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4809 max_sectors = mddev->resync_max_sectors;
4811 max_sectors = mddev->dev_sectors;
4813 resync = mddev->curr_resync_completed;
4814 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4817 static struct md_sysfs_entry md_sync_completed =
4818 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4821 min_sync_show(struct mddev *mddev, char *page)
4823 return sprintf(page, "%llu\n",
4824 (unsigned long long)mddev->resync_min);
4827 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4829 unsigned long long min;
4832 if (kstrtoull(buf, 10, &min))
4835 spin_lock(&mddev->lock);
4837 if (min > mddev->resync_max)
4841 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4844 /* Round down to multiple of 4K for safety */
4845 mddev->resync_min = round_down(min, 8);
4849 spin_unlock(&mddev->lock);
4853 static struct md_sysfs_entry md_min_sync =
4854 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4857 max_sync_show(struct mddev *mddev, char *page)
4859 if (mddev->resync_max == MaxSector)
4860 return sprintf(page, "max\n");
4862 return sprintf(page, "%llu\n",
4863 (unsigned long long)mddev->resync_max);
4866 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4869 spin_lock(&mddev->lock);
4870 if (strncmp(buf, "max", 3) == 0)
4871 mddev->resync_max = MaxSector;
4873 unsigned long long max;
4877 if (kstrtoull(buf, 10, &max))
4879 if (max < mddev->resync_min)
4883 if (max < mddev->resync_max &&
4885 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4888 /* Must be a multiple of chunk_size */
4889 chunk = mddev->chunk_sectors;
4891 sector_t temp = max;
4894 if (sector_div(temp, chunk))
4897 mddev->resync_max = max;
4899 wake_up(&mddev->recovery_wait);
4902 spin_unlock(&mddev->lock);
4906 static struct md_sysfs_entry md_max_sync =
4907 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4910 suspend_lo_show(struct mddev *mddev, char *page)
4912 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4916 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4918 unsigned long long new;
4921 err = kstrtoull(buf, 10, &new);
4924 if (new != (sector_t)new)
4927 err = mddev_lock(mddev);
4931 if (mddev->pers == NULL ||
4932 mddev->pers->quiesce == NULL)
4934 mddev_suspend(mddev);
4935 mddev->suspend_lo = new;
4936 mddev_resume(mddev);
4940 mddev_unlock(mddev);
4943 static struct md_sysfs_entry md_suspend_lo =
4944 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4947 suspend_hi_show(struct mddev *mddev, char *page)
4949 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4953 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4955 unsigned long long new;
4958 err = kstrtoull(buf, 10, &new);
4961 if (new != (sector_t)new)
4964 err = mddev_lock(mddev);
4968 if (mddev->pers == NULL)
4971 mddev_suspend(mddev);
4972 mddev->suspend_hi = new;
4973 mddev_resume(mddev);
4977 mddev_unlock(mddev);
4980 static struct md_sysfs_entry md_suspend_hi =
4981 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4984 reshape_position_show(struct mddev *mddev, char *page)
4986 if (mddev->reshape_position != MaxSector)
4987 return sprintf(page, "%llu\n",
4988 (unsigned long long)mddev->reshape_position);
4989 strcpy(page, "none\n");
4994 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4996 struct md_rdev *rdev;
4997 unsigned long long new;
5000 err = kstrtoull(buf, 10, &new);
5003 if (new != (sector_t)new)
5005 err = mddev_lock(mddev);
5011 mddev->reshape_position = new;
5012 mddev->delta_disks = 0;
5013 mddev->reshape_backwards = 0;
5014 mddev->new_level = mddev->level;
5015 mddev->new_layout = mddev->layout;
5016 mddev->new_chunk_sectors = mddev->chunk_sectors;
5017 rdev_for_each(rdev, mddev)
5018 rdev->new_data_offset = rdev->data_offset;
5021 mddev_unlock(mddev);
5025 static struct md_sysfs_entry md_reshape_position =
5026 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5027 reshape_position_store);
5030 reshape_direction_show(struct mddev *mddev, char *page)
5032 return sprintf(page, "%s\n",
5033 mddev->reshape_backwards ? "backwards" : "forwards");
5037 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5042 if (cmd_match(buf, "forwards"))
5044 else if (cmd_match(buf, "backwards"))
5048 if (mddev->reshape_backwards == backwards)
5051 err = mddev_lock(mddev);
5054 /* check if we are allowed to change */
5055 if (mddev->delta_disks)
5057 else if (mddev->persistent &&
5058 mddev->major_version == 0)
5061 mddev->reshape_backwards = backwards;
5062 mddev_unlock(mddev);
5066 static struct md_sysfs_entry md_reshape_direction =
5067 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5068 reshape_direction_store);
5071 array_size_show(struct mddev *mddev, char *page)
5073 if (mddev->external_size)
5074 return sprintf(page, "%llu\n",
5075 (unsigned long long)mddev->array_sectors/2);
5077 return sprintf(page, "default\n");
5081 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5086 err = mddev_lock(mddev);
5090 /* cluster raid doesn't support change array_sectors */
5091 if (mddev_is_clustered(mddev)) {
5092 mddev_unlock(mddev);
5096 if (strncmp(buf, "default", 7) == 0) {
5098 sectors = mddev->pers->size(mddev, 0, 0);
5100 sectors = mddev->array_sectors;
5102 mddev->external_size = 0;
5104 if (strict_blocks_to_sectors(buf, §ors) < 0)
5106 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5109 mddev->external_size = 1;
5113 mddev->array_sectors = sectors;
5115 set_capacity(mddev->gendisk, mddev->array_sectors);
5116 revalidate_disk(mddev->gendisk);
5119 mddev_unlock(mddev);
5123 static struct md_sysfs_entry md_array_size =
5124 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5128 consistency_policy_show(struct mddev *mddev, char *page)
5132 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5133 ret = sprintf(page, "journal\n");
5134 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5135 ret = sprintf(page, "ppl\n");
5136 } else if (mddev->bitmap) {
5137 ret = sprintf(page, "bitmap\n");
5138 } else if (mddev->pers) {
5139 if (mddev->pers->sync_request)
5140 ret = sprintf(page, "resync\n");
5142 ret = sprintf(page, "none\n");
5144 ret = sprintf(page, "unknown\n");
5151 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5156 if (mddev->pers->change_consistency_policy)
5157 err = mddev->pers->change_consistency_policy(mddev, buf);
5160 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5161 set_bit(MD_HAS_PPL, &mddev->flags);
5166 return err ? err : len;
5169 static struct md_sysfs_entry md_consistency_policy =
5170 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5171 consistency_policy_store);
5173 static struct attribute *md_default_attrs[] = {
5176 &md_raid_disks.attr,
5177 &md_chunk_size.attr,
5179 &md_resync_start.attr,
5181 &md_new_device.attr,
5182 &md_safe_delay.attr,
5183 &md_array_state.attr,
5184 &md_reshape_position.attr,
5185 &md_reshape_direction.attr,
5186 &md_array_size.attr,
5187 &max_corr_read_errors.attr,
5188 &md_consistency_policy.attr,
5192 static struct attribute *md_redundancy_attrs[] = {
5194 &md_last_scan_mode.attr,
5195 &md_mismatches.attr,
5198 &md_sync_speed.attr,
5199 &md_sync_force_parallel.attr,
5200 &md_sync_completed.attr,
5203 &md_suspend_lo.attr,
5204 &md_suspend_hi.attr,
5209 static struct attribute_group md_redundancy_group = {
5211 .attrs = md_redundancy_attrs,
5215 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5217 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5218 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5223 spin_lock(&all_mddevs_lock);
5224 if (list_empty(&mddev->all_mddevs)) {
5225 spin_unlock(&all_mddevs_lock);
5229 spin_unlock(&all_mddevs_lock);
5231 rv = entry->show(mddev, page);
5237 md_attr_store(struct kobject *kobj, struct attribute *attr,
5238 const char *page, size_t length)
5240 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5241 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5246 if (!capable(CAP_SYS_ADMIN))
5248 spin_lock(&all_mddevs_lock);
5249 if (list_empty(&mddev->all_mddevs)) {
5250 spin_unlock(&all_mddevs_lock);
5254 spin_unlock(&all_mddevs_lock);
5255 rv = entry->store(mddev, page, length);
5260 static void md_free(struct kobject *ko)
5262 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5264 if (mddev->sysfs_state)
5265 sysfs_put(mddev->sysfs_state);
5268 del_gendisk(mddev->gendisk);
5270 blk_cleanup_queue(mddev->queue);
5272 put_disk(mddev->gendisk);
5273 percpu_ref_exit(&mddev->writes_pending);
5275 bioset_exit(&mddev->bio_set);
5276 bioset_exit(&mddev->sync_set);
5280 static const struct sysfs_ops md_sysfs_ops = {
5281 .show = md_attr_show,
5282 .store = md_attr_store,
5284 static struct kobj_type md_ktype = {
5286 .sysfs_ops = &md_sysfs_ops,
5287 .default_attrs = md_default_attrs,
5292 static void mddev_delayed_delete(struct work_struct *ws)
5294 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5296 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5297 kobject_del(&mddev->kobj);
5298 kobject_put(&mddev->kobj);
5301 static void no_op(struct percpu_ref *r) {}
5303 int mddev_init_writes_pending(struct mddev *mddev)
5305 if (mddev->writes_pending.percpu_count_ptr)
5307 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5309 /* We want to start with the refcount at zero */
5310 percpu_ref_put(&mddev->writes_pending);
5313 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5315 static int md_alloc(dev_t dev, char *name)
5318 * If dev is zero, name is the name of a device to allocate with
5319 * an arbitrary minor number. It will be "md_???"
5320 * If dev is non-zero it must be a device number with a MAJOR of
5321 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5322 * the device is being created by opening a node in /dev.
5323 * If "name" is not NULL, the device is being created by
5324 * writing to /sys/module/md_mod/parameters/new_array.
5326 static DEFINE_MUTEX(disks_mutex);
5327 struct mddev *mddev = mddev_find_or_alloc(dev);
5328 struct gendisk *disk;
5337 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5338 shift = partitioned ? MdpMinorShift : 0;
5339 unit = MINOR(mddev->unit) >> shift;
5341 /* wait for any previous instance of this device to be
5342 * completely removed (mddev_delayed_delete).
5344 flush_workqueue(md_misc_wq);
5346 mutex_lock(&disks_mutex);
5352 /* Need to ensure that 'name' is not a duplicate.
5354 struct mddev *mddev2;
5355 spin_lock(&all_mddevs_lock);
5357 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5358 if (mddev2->gendisk &&
5359 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5360 spin_unlock(&all_mddevs_lock);
5363 spin_unlock(&all_mddevs_lock);
5367 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5369 mddev->hold_active = UNTIL_STOP;
5372 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5375 mddev->queue->queuedata = mddev;
5377 blk_queue_make_request(mddev->queue, md_make_request);
5378 blk_set_stacking_limits(&mddev->queue->limits);
5380 disk = alloc_disk(1 << shift);
5382 blk_cleanup_queue(mddev->queue);
5383 mddev->queue = NULL;
5386 disk->major = MAJOR(mddev->unit);
5387 disk->first_minor = unit << shift;
5389 strcpy(disk->disk_name, name);
5390 else if (partitioned)
5391 sprintf(disk->disk_name, "md_d%d", unit);
5393 sprintf(disk->disk_name, "md%d", unit);
5394 disk->fops = &md_fops;
5395 disk->private_data = mddev;
5396 disk->queue = mddev->queue;
5397 blk_queue_write_cache(mddev->queue, true, true);
5398 /* Allow extended partitions. This makes the
5399 * 'mdp' device redundant, but we can't really
5402 disk->flags |= GENHD_FL_EXT_DEVT;
5403 mddev->gendisk = disk;
5406 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5408 /* This isn't possible, but as kobject_init_and_add is marked
5409 * __must_check, we must do something with the result
5411 pr_debug("md: cannot register %s/md - name in use\n",
5415 if (mddev->kobj.sd &&
5416 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5417 pr_debug("pointless warning\n");
5419 mutex_unlock(&disks_mutex);
5420 if (!error && mddev->kobj.sd) {
5421 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5422 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5428 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5431 md_alloc(dev, NULL);
5435 static int add_named_array(const char *val, const struct kernel_param *kp)
5438 * val must be "md_*" or "mdNNN".
5439 * For "md_*" we allocate an array with a large free minor number, and
5440 * set the name to val. val must not already be an active name.
5441 * For "mdNNN" we allocate an array with the minor number NNN
5442 * which must not already be in use.
5444 int len = strlen(val);
5445 char buf[DISK_NAME_LEN];
5446 unsigned long devnum;
5448 while (len && val[len-1] == '\n')
5450 if (len >= DISK_NAME_LEN)
5452 strlcpy(buf, val, len+1);
5453 if (strncmp(buf, "md_", 3) == 0)
5454 return md_alloc(0, buf);
5455 if (strncmp(buf, "md", 2) == 0 &&
5457 kstrtoul(buf+2, 10, &devnum) == 0 &&
5458 devnum <= MINORMASK)
5459 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5464 static void md_safemode_timeout(struct timer_list *t)
5466 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5468 mddev->safemode = 1;
5469 if (mddev->external)
5470 sysfs_notify_dirent_safe(mddev->sysfs_state);
5472 md_wakeup_thread(mddev->thread);
5475 static int start_dirty_degraded;
5477 int md_run(struct mddev *mddev)
5480 struct md_rdev *rdev;
5481 struct md_personality *pers;
5483 if (list_empty(&mddev->disks))
5484 /* cannot run an array with no devices.. */
5489 /* Cannot run until previous stop completes properly */
5490 if (mddev->sysfs_active)
5494 * Analyze all RAID superblock(s)
5496 if (!mddev->raid_disks) {
5497 if (!mddev->persistent)
5502 if (mddev->level != LEVEL_NONE)
5503 request_module("md-level-%d", mddev->level);
5504 else if (mddev->clevel[0])
5505 request_module("md-%s", mddev->clevel);
5508 * Drop all container device buffers, from now on
5509 * the only valid external interface is through the md
5512 mddev->has_superblocks = false;
5513 rdev_for_each(rdev, mddev) {
5514 if (test_bit(Faulty, &rdev->flags))
5516 sync_blockdev(rdev->bdev);
5517 invalidate_bdev(rdev->bdev);
5518 if (mddev->ro != 1 &&
5519 (bdev_read_only(rdev->bdev) ||
5520 bdev_read_only(rdev->meta_bdev))) {
5523 set_disk_ro(mddev->gendisk, 1);
5527 mddev->has_superblocks = true;
5529 /* perform some consistency tests on the device.
5530 * We don't want the data to overlap the metadata,
5531 * Internal Bitmap issues have been handled elsewhere.
5533 if (rdev->meta_bdev) {
5534 /* Nothing to check */;
5535 } else if (rdev->data_offset < rdev->sb_start) {
5536 if (mddev->dev_sectors &&
5537 rdev->data_offset + mddev->dev_sectors
5539 pr_warn("md: %s: data overlaps metadata\n",
5544 if (rdev->sb_start + rdev->sb_size/512
5545 > rdev->data_offset) {
5546 pr_warn("md: %s: metadata overlaps data\n",
5551 sysfs_notify_dirent_safe(rdev->sysfs_state);
5554 if (!bioset_initialized(&mddev->bio_set)) {
5555 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5559 if (!bioset_initialized(&mddev->sync_set)) {
5560 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5565 spin_lock(&pers_lock);
5566 pers = find_pers(mddev->level, mddev->clevel);
5567 if (!pers || !try_module_get(pers->owner)) {
5568 spin_unlock(&pers_lock);
5569 if (mddev->level != LEVEL_NONE)
5570 pr_warn("md: personality for level %d is not loaded!\n",
5573 pr_warn("md: personality for level %s is not loaded!\n",
5578 spin_unlock(&pers_lock);
5579 if (mddev->level != pers->level) {
5580 mddev->level = pers->level;
5581 mddev->new_level = pers->level;
5583 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5585 if (mddev->reshape_position != MaxSector &&
5586 pers->start_reshape == NULL) {
5587 /* This personality cannot handle reshaping... */
5588 module_put(pers->owner);
5593 if (pers->sync_request) {
5594 /* Warn if this is a potentially silly
5597 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5598 struct md_rdev *rdev2;
5601 rdev_for_each(rdev, mddev)
5602 rdev_for_each(rdev2, mddev) {
5604 rdev->bdev->bd_contains ==
5605 rdev2->bdev->bd_contains) {
5606 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5608 bdevname(rdev->bdev,b),
5609 bdevname(rdev2->bdev,b2));
5615 pr_warn("True protection against single-disk failure might be compromised.\n");
5618 mddev->recovery = 0;
5619 /* may be over-ridden by personality */
5620 mddev->resync_max_sectors = mddev->dev_sectors;
5622 mddev->ok_start_degraded = start_dirty_degraded;
5624 if (start_readonly && mddev->ro == 0)
5625 mddev->ro = 2; /* read-only, but switch on first write */
5627 err = pers->run(mddev);
5629 pr_warn("md: pers->run() failed ...\n");
5630 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5631 WARN_ONCE(!mddev->external_size,
5632 "%s: default size too small, but 'external_size' not in effect?\n",
5634 pr_warn("md: invalid array_size %llu > default size %llu\n",
5635 (unsigned long long)mddev->array_sectors / 2,
5636 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5639 if (err == 0 && pers->sync_request &&
5640 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5641 struct bitmap *bitmap;
5643 bitmap = md_bitmap_create(mddev, -1);
5644 if (IS_ERR(bitmap)) {
5645 err = PTR_ERR(bitmap);
5646 pr_warn("%s: failed to create bitmap (%d)\n",
5647 mdname(mddev), err);
5649 mddev->bitmap = bitmap;
5653 mddev_detach(mddev);
5655 pers->free(mddev, mddev->private);
5656 mddev->private = NULL;
5657 module_put(pers->owner);
5658 md_bitmap_destroy(mddev);
5664 rdev_for_each(rdev, mddev) {
5665 if (rdev->raid_disk >= 0 &&
5666 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5671 if (mddev->degraded)
5674 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5676 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5677 mddev->queue->backing_dev_info->congested_data = mddev;
5678 mddev->queue->backing_dev_info->congested_fn = md_congested;
5680 if (pers->sync_request) {
5681 if (mddev->kobj.sd &&
5682 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5683 pr_warn("md: cannot register extra attributes for %s\n",
5685 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5686 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5689 atomic_set(&mddev->max_corr_read_errors,
5690 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5691 mddev->safemode = 0;
5692 if (mddev_is_clustered(mddev))
5693 mddev->safemode_delay = 0;
5695 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5698 spin_lock(&mddev->lock);
5700 spin_unlock(&mddev->lock);
5701 rdev_for_each(rdev, mddev)
5702 if (rdev->raid_disk >= 0)
5703 if (sysfs_link_rdev(mddev, rdev))
5704 /* failure here is OK */;
5706 if (mddev->degraded && !mddev->ro)
5707 /* This ensures that recovering status is reported immediately
5708 * via sysfs - until a lack of spares is confirmed.
5710 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5711 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5713 if (mddev->sb_flags)
5714 md_update_sb(mddev, 0);
5716 md_new_event(mddev);
5720 bioset_exit(&mddev->bio_set);
5721 bioset_exit(&mddev->sync_set);
5724 EXPORT_SYMBOL_GPL(md_run);
5726 static int do_md_run(struct mddev *mddev)
5730 set_bit(MD_NOT_READY, &mddev->flags);
5731 err = md_run(mddev);
5734 err = md_bitmap_load(mddev);
5736 md_bitmap_destroy(mddev);
5740 if (mddev_is_clustered(mddev))
5741 md_allow_write(mddev);
5743 /* run start up tasks that require md_thread */
5746 md_wakeup_thread(mddev->thread);
5747 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5749 set_capacity(mddev->gendisk, mddev->array_sectors);
5750 revalidate_disk(mddev->gendisk);
5751 clear_bit(MD_NOT_READY, &mddev->flags);
5753 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5754 sysfs_notify_dirent_safe(mddev->sysfs_state);
5755 sysfs_notify_dirent_safe(mddev->sysfs_action);
5756 sysfs_notify(&mddev->kobj, NULL, "degraded");
5758 clear_bit(MD_NOT_READY, &mddev->flags);
5762 int md_start(struct mddev *mddev)
5766 if (mddev->pers->start) {
5767 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5768 md_wakeup_thread(mddev->thread);
5769 ret = mddev->pers->start(mddev);
5770 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5771 md_wakeup_thread(mddev->sync_thread);
5775 EXPORT_SYMBOL_GPL(md_start);
5777 static int restart_array(struct mddev *mddev)
5779 struct gendisk *disk = mddev->gendisk;
5780 struct md_rdev *rdev;
5781 bool has_journal = false;
5782 bool has_readonly = false;
5784 /* Complain if it has no devices */
5785 if (list_empty(&mddev->disks))
5793 rdev_for_each_rcu(rdev, mddev) {
5794 if (test_bit(Journal, &rdev->flags) &&
5795 !test_bit(Faulty, &rdev->flags))
5797 if (bdev_read_only(rdev->bdev))
5798 has_readonly = true;
5801 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5802 /* Don't restart rw with journal missing/faulty */
5807 mddev->safemode = 0;
5809 set_disk_ro(disk, 0);
5810 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5811 /* Kick recovery or resync if necessary */
5812 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5813 md_wakeup_thread(mddev->thread);
5814 md_wakeup_thread(mddev->sync_thread);
5815 sysfs_notify_dirent_safe(mddev->sysfs_state);
5819 static void md_clean(struct mddev *mddev)
5821 mddev->array_sectors = 0;
5822 mddev->external_size = 0;
5823 mddev->dev_sectors = 0;
5824 mddev->raid_disks = 0;
5825 mddev->recovery_cp = 0;
5826 mddev->resync_min = 0;
5827 mddev->resync_max = MaxSector;
5828 mddev->reshape_position = MaxSector;
5829 mddev->external = 0;
5830 mddev->persistent = 0;
5831 mddev->level = LEVEL_NONE;
5832 mddev->clevel[0] = 0;
5834 mddev->sb_flags = 0;
5836 mddev->metadata_type[0] = 0;
5837 mddev->chunk_sectors = 0;
5838 mddev->ctime = mddev->utime = 0;
5840 mddev->max_disks = 0;
5842 mddev->can_decrease_events = 0;
5843 mddev->delta_disks = 0;
5844 mddev->reshape_backwards = 0;
5845 mddev->new_level = LEVEL_NONE;
5846 mddev->new_layout = 0;
5847 mddev->new_chunk_sectors = 0;
5848 mddev->curr_resync = 0;
5849 atomic64_set(&mddev->resync_mismatches, 0);
5850 mddev->suspend_lo = mddev->suspend_hi = 0;
5851 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5852 mddev->recovery = 0;
5855 mddev->degraded = 0;
5856 mddev->safemode = 0;
5857 mddev->private = NULL;
5858 mddev->cluster_info = NULL;
5859 mddev->bitmap_info.offset = 0;
5860 mddev->bitmap_info.default_offset = 0;
5861 mddev->bitmap_info.default_space = 0;
5862 mddev->bitmap_info.chunksize = 0;
5863 mddev->bitmap_info.daemon_sleep = 0;
5864 mddev->bitmap_info.max_write_behind = 0;
5865 mddev->bitmap_info.nodes = 0;
5868 static void __md_stop_writes(struct mddev *mddev)
5870 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5871 flush_workqueue(md_misc_wq);
5872 if (mddev->sync_thread) {
5873 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5874 md_reap_sync_thread(mddev);
5877 del_timer_sync(&mddev->safemode_timer);
5879 if (mddev->pers && mddev->pers->quiesce) {
5880 mddev->pers->quiesce(mddev, 1);
5881 mddev->pers->quiesce(mddev, 0);
5883 md_bitmap_flush(mddev);
5885 if (mddev->ro == 0 &&
5886 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5888 /* mark array as shutdown cleanly */
5889 if (!mddev_is_clustered(mddev))
5891 md_update_sb(mddev, 1);
5895 void md_stop_writes(struct mddev *mddev)
5897 mddev_lock_nointr(mddev);
5898 __md_stop_writes(mddev);
5899 mddev_unlock(mddev);
5901 EXPORT_SYMBOL_GPL(md_stop_writes);
5903 static void mddev_detach(struct mddev *mddev)
5905 md_bitmap_wait_behind_writes(mddev);
5906 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
5907 mddev->pers->quiesce(mddev, 1);
5908 mddev->pers->quiesce(mddev, 0);
5910 md_unregister_thread(&mddev->thread);
5912 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5915 static void __md_stop(struct mddev *mddev)
5917 struct md_personality *pers = mddev->pers;
5918 md_bitmap_destroy(mddev);
5919 mddev_detach(mddev);
5920 /* Ensure ->event_work is done */
5921 flush_workqueue(md_misc_wq);
5922 spin_lock(&mddev->lock);
5924 spin_unlock(&mddev->lock);
5925 pers->free(mddev, mddev->private);
5926 mddev->private = NULL;
5927 if (pers->sync_request && mddev->to_remove == NULL)
5928 mddev->to_remove = &md_redundancy_group;
5929 module_put(pers->owner);
5930 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5933 void md_stop(struct mddev *mddev)
5935 /* stop the array and free an attached data structures.
5936 * This is called from dm-raid
5939 bioset_exit(&mddev->bio_set);
5940 bioset_exit(&mddev->sync_set);
5943 EXPORT_SYMBOL_GPL(md_stop);
5945 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5950 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5952 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5953 md_wakeup_thread(mddev->thread);
5955 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5956 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5957 if (mddev->sync_thread)
5958 /* Thread might be blocked waiting for metadata update
5959 * which will now never happen */
5960 wake_up_process(mddev->sync_thread->tsk);
5962 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5964 mddev_unlock(mddev);
5965 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5967 wait_event(mddev->sb_wait,
5968 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5969 mddev_lock_nointr(mddev);
5971 mutex_lock(&mddev->open_mutex);
5972 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5973 mddev->sync_thread ||
5974 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5975 pr_warn("md: %s still in use.\n",mdname(mddev));
5977 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5978 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5979 md_wakeup_thread(mddev->thread);
5985 __md_stop_writes(mddev);
5991 set_disk_ro(mddev->gendisk, 1);
5992 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5993 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5994 md_wakeup_thread(mddev->thread);
5995 sysfs_notify_dirent_safe(mddev->sysfs_state);
5999 mutex_unlock(&mddev->open_mutex);
6004 * 0 - completely stop and dis-assemble array
6005 * 2 - stop but do not disassemble array
6007 static int do_md_stop(struct mddev *mddev, int mode,
6008 struct block_device *bdev)
6010 struct gendisk *disk = mddev->gendisk;
6011 struct md_rdev *rdev;
6014 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6016 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6017 md_wakeup_thread(mddev->thread);
6019 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6020 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6021 if (mddev->sync_thread)
6022 /* Thread might be blocked waiting for metadata update
6023 * which will now never happen */
6024 wake_up_process(mddev->sync_thread->tsk);
6026 mddev_unlock(mddev);
6027 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6028 !test_bit(MD_RECOVERY_RUNNING,
6029 &mddev->recovery)));
6030 mddev_lock_nointr(mddev);
6032 mutex_lock(&mddev->open_mutex);
6033 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6034 mddev->sysfs_active ||
6035 mddev->sync_thread ||
6036 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6037 pr_warn("md: %s still in use.\n",mdname(mddev));
6038 mutex_unlock(&mddev->open_mutex);
6040 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6041 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6042 md_wakeup_thread(mddev->thread);
6048 set_disk_ro(disk, 0);
6050 __md_stop_writes(mddev);
6052 mddev->queue->backing_dev_info->congested_fn = NULL;
6054 /* tell userspace to handle 'inactive' */
6055 sysfs_notify_dirent_safe(mddev->sysfs_state);
6057 rdev_for_each(rdev, mddev)
6058 if (rdev->raid_disk >= 0)
6059 sysfs_unlink_rdev(mddev, rdev);
6061 set_capacity(disk, 0);
6062 mutex_unlock(&mddev->open_mutex);
6064 revalidate_disk(disk);
6069 mutex_unlock(&mddev->open_mutex);
6071 * Free resources if final stop
6074 pr_info("md: %s stopped.\n", mdname(mddev));
6076 if (mddev->bitmap_info.file) {
6077 struct file *f = mddev->bitmap_info.file;
6078 spin_lock(&mddev->lock);
6079 mddev->bitmap_info.file = NULL;
6080 spin_unlock(&mddev->lock);
6083 mddev->bitmap_info.offset = 0;
6085 export_array(mddev);
6088 if (mddev->hold_active == UNTIL_STOP)
6089 mddev->hold_active = 0;
6091 md_new_event(mddev);
6092 sysfs_notify_dirent_safe(mddev->sysfs_state);
6097 static void autorun_array(struct mddev *mddev)
6099 struct md_rdev *rdev;
6102 if (list_empty(&mddev->disks))
6105 pr_info("md: running: ");
6107 rdev_for_each(rdev, mddev) {
6108 char b[BDEVNAME_SIZE];
6109 pr_cont("<%s>", bdevname(rdev->bdev,b));
6113 err = do_md_run(mddev);
6115 pr_warn("md: do_md_run() returned %d\n", err);
6116 do_md_stop(mddev, 0, NULL);
6121 * lets try to run arrays based on all disks that have arrived
6122 * until now. (those are in pending_raid_disks)
6124 * the method: pick the first pending disk, collect all disks with
6125 * the same UUID, remove all from the pending list and put them into
6126 * the 'same_array' list. Then order this list based on superblock
6127 * update time (freshest comes first), kick out 'old' disks and
6128 * compare superblocks. If everything's fine then run it.
6130 * If "unit" is allocated, then bump its reference count
6132 static void autorun_devices(int part)
6134 struct md_rdev *rdev0, *rdev, *tmp;
6135 struct mddev *mddev;
6136 char b[BDEVNAME_SIZE];
6138 pr_info("md: autorun ...\n");
6139 while (!list_empty(&pending_raid_disks)) {
6142 LIST_HEAD(candidates);
6143 rdev0 = list_entry(pending_raid_disks.next,
6144 struct md_rdev, same_set);
6146 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6147 INIT_LIST_HEAD(&candidates);
6148 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6149 if (super_90_load(rdev, rdev0, 0) >= 0) {
6150 pr_debug("md: adding %s ...\n",
6151 bdevname(rdev->bdev,b));
6152 list_move(&rdev->same_set, &candidates);
6155 * now we have a set of devices, with all of them having
6156 * mostly sane superblocks. It's time to allocate the
6160 dev = MKDEV(mdp_major,
6161 rdev0->preferred_minor << MdpMinorShift);
6162 unit = MINOR(dev) >> MdpMinorShift;
6164 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6167 if (rdev0->preferred_minor != unit) {
6168 pr_warn("md: unit number in %s is bad: %d\n",
6169 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6173 md_probe(dev, NULL, NULL);
6174 mddev = mddev_find(dev);
6178 if (mddev_lock(mddev))
6179 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6180 else if (mddev->raid_disks || mddev->major_version
6181 || !list_empty(&mddev->disks)) {
6182 pr_warn("md: %s already running, cannot run %s\n",
6183 mdname(mddev), bdevname(rdev0->bdev,b));
6184 mddev_unlock(mddev);
6186 pr_debug("md: created %s\n", mdname(mddev));
6187 mddev->persistent = 1;
6188 rdev_for_each_list(rdev, tmp, &candidates) {
6189 list_del_init(&rdev->same_set);
6190 if (bind_rdev_to_array(rdev, mddev))
6193 autorun_array(mddev);
6194 mddev_unlock(mddev);
6196 /* on success, candidates will be empty, on error
6199 rdev_for_each_list(rdev, tmp, &candidates) {
6200 list_del_init(&rdev->same_set);
6205 pr_info("md: ... autorun DONE.\n");
6207 #endif /* !MODULE */
6209 static int get_version(void __user *arg)
6213 ver.major = MD_MAJOR_VERSION;
6214 ver.minor = MD_MINOR_VERSION;
6215 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6217 if (copy_to_user(arg, &ver, sizeof(ver)))
6223 static int get_array_info(struct mddev *mddev, void __user *arg)
6225 mdu_array_info_t info;
6226 int nr,working,insync,failed,spare;
6227 struct md_rdev *rdev;
6229 nr = working = insync = failed = spare = 0;
6231 rdev_for_each_rcu(rdev, mddev) {
6233 if (test_bit(Faulty, &rdev->flags))
6237 if (test_bit(In_sync, &rdev->flags))
6239 else if (test_bit(Journal, &rdev->flags))
6240 /* TODO: add journal count to md_u.h */
6248 info.major_version = mddev->major_version;
6249 info.minor_version = mddev->minor_version;
6250 info.patch_version = MD_PATCHLEVEL_VERSION;
6251 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6252 info.level = mddev->level;
6253 info.size = mddev->dev_sectors / 2;
6254 if (info.size != mddev->dev_sectors / 2) /* overflow */
6257 info.raid_disks = mddev->raid_disks;
6258 info.md_minor = mddev->md_minor;
6259 info.not_persistent= !mddev->persistent;
6261 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6264 info.state = (1<<MD_SB_CLEAN);
6265 if (mddev->bitmap && mddev->bitmap_info.offset)
6266 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6267 if (mddev_is_clustered(mddev))
6268 info.state |= (1<<MD_SB_CLUSTERED);
6269 info.active_disks = insync;
6270 info.working_disks = working;
6271 info.failed_disks = failed;
6272 info.spare_disks = spare;
6274 info.layout = mddev->layout;
6275 info.chunk_size = mddev->chunk_sectors << 9;
6277 if (copy_to_user(arg, &info, sizeof(info)))
6283 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6285 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6289 file = kzalloc(sizeof(*file), GFP_NOIO);
6294 spin_lock(&mddev->lock);
6295 /* bitmap enabled */
6296 if (mddev->bitmap_info.file) {
6297 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6298 sizeof(file->pathname));
6302 memmove(file->pathname, ptr,
6303 sizeof(file->pathname)-(ptr-file->pathname));
6305 spin_unlock(&mddev->lock);
6308 copy_to_user(arg, file, sizeof(*file)))
6315 static int get_disk_info(struct mddev *mddev, void __user * arg)
6317 mdu_disk_info_t info;
6318 struct md_rdev *rdev;
6320 if (copy_from_user(&info, arg, sizeof(info)))
6324 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6326 info.major = MAJOR(rdev->bdev->bd_dev);
6327 info.minor = MINOR(rdev->bdev->bd_dev);
6328 info.raid_disk = rdev->raid_disk;
6330 if (test_bit(Faulty, &rdev->flags))
6331 info.state |= (1<<MD_DISK_FAULTY);
6332 else if (test_bit(In_sync, &rdev->flags)) {
6333 info.state |= (1<<MD_DISK_ACTIVE);
6334 info.state |= (1<<MD_DISK_SYNC);
6336 if (test_bit(Journal, &rdev->flags))
6337 info.state |= (1<<MD_DISK_JOURNAL);
6338 if (test_bit(WriteMostly, &rdev->flags))
6339 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6340 if (test_bit(FailFast, &rdev->flags))
6341 info.state |= (1<<MD_DISK_FAILFAST);
6343 info.major = info.minor = 0;
6344 info.raid_disk = -1;
6345 info.state = (1<<MD_DISK_REMOVED);
6349 if (copy_to_user(arg, &info, sizeof(info)))
6355 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6357 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6358 struct md_rdev *rdev;
6359 dev_t dev = MKDEV(info->major,info->minor);
6361 if (mddev_is_clustered(mddev) &&
6362 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6363 pr_warn("%s: Cannot add to clustered mddev.\n",
6368 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6371 if (!mddev->raid_disks) {
6373 /* expecting a device which has a superblock */
6374 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6376 pr_warn("md: md_import_device returned %ld\n",
6378 return PTR_ERR(rdev);
6380 if (!list_empty(&mddev->disks)) {
6381 struct md_rdev *rdev0
6382 = list_entry(mddev->disks.next,
6383 struct md_rdev, same_set);
6384 err = super_types[mddev->major_version]
6385 .load_super(rdev, rdev0, mddev->minor_version);
6387 pr_warn("md: %s has different UUID to %s\n",
6388 bdevname(rdev->bdev,b),
6389 bdevname(rdev0->bdev,b2));
6394 err = bind_rdev_to_array(rdev, mddev);
6401 * add_new_disk can be used once the array is assembled
6402 * to add "hot spares". They must already have a superblock
6407 if (!mddev->pers->hot_add_disk) {
6408 pr_warn("%s: personality does not support diskops!\n",
6412 if (mddev->persistent)
6413 rdev = md_import_device(dev, mddev->major_version,
6414 mddev->minor_version);
6416 rdev = md_import_device(dev, -1, -1);
6418 pr_warn("md: md_import_device returned %ld\n",
6420 return PTR_ERR(rdev);
6422 /* set saved_raid_disk if appropriate */
6423 if (!mddev->persistent) {
6424 if (info->state & (1<<MD_DISK_SYNC) &&
6425 info->raid_disk < mddev->raid_disks) {
6426 rdev->raid_disk = info->raid_disk;
6427 set_bit(In_sync, &rdev->flags);
6428 clear_bit(Bitmap_sync, &rdev->flags);
6430 rdev->raid_disk = -1;
6431 rdev->saved_raid_disk = rdev->raid_disk;
6433 super_types[mddev->major_version].
6434 validate_super(mddev, rdev);
6435 if ((info->state & (1<<MD_DISK_SYNC)) &&
6436 rdev->raid_disk != info->raid_disk) {
6437 /* This was a hot-add request, but events doesn't
6438 * match, so reject it.
6444 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6445 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6446 set_bit(WriteMostly, &rdev->flags);
6448 clear_bit(WriteMostly, &rdev->flags);
6449 if (info->state & (1<<MD_DISK_FAILFAST))
6450 set_bit(FailFast, &rdev->flags);
6452 clear_bit(FailFast, &rdev->flags);
6454 if (info->state & (1<<MD_DISK_JOURNAL)) {
6455 struct md_rdev *rdev2;
6456 bool has_journal = false;
6458 /* make sure no existing journal disk */
6459 rdev_for_each(rdev2, mddev) {
6460 if (test_bit(Journal, &rdev2->flags)) {
6465 if (has_journal || mddev->bitmap) {
6469 set_bit(Journal, &rdev->flags);
6472 * check whether the device shows up in other nodes
6474 if (mddev_is_clustered(mddev)) {
6475 if (info->state & (1 << MD_DISK_CANDIDATE))
6476 set_bit(Candidate, &rdev->flags);
6477 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6478 /* --add initiated by this node */
6479 err = md_cluster_ops->add_new_disk(mddev, rdev);
6487 rdev->raid_disk = -1;
6488 err = bind_rdev_to_array(rdev, mddev);
6493 if (mddev_is_clustered(mddev)) {
6494 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6496 err = md_cluster_ops->new_disk_ack(mddev,
6499 md_kick_rdev_from_array(rdev);
6503 md_cluster_ops->add_new_disk_cancel(mddev);
6505 err = add_bound_rdev(rdev);
6509 err = add_bound_rdev(rdev);
6514 /* otherwise, add_new_disk is only allowed
6515 * for major_version==0 superblocks
6517 if (mddev->major_version != 0) {
6518 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6522 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6524 rdev = md_import_device(dev, -1, 0);
6526 pr_warn("md: error, md_import_device() returned %ld\n",
6528 return PTR_ERR(rdev);
6530 rdev->desc_nr = info->number;
6531 if (info->raid_disk < mddev->raid_disks)
6532 rdev->raid_disk = info->raid_disk;
6534 rdev->raid_disk = -1;
6536 if (rdev->raid_disk < mddev->raid_disks)
6537 if (info->state & (1<<MD_DISK_SYNC))
6538 set_bit(In_sync, &rdev->flags);
6540 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6541 set_bit(WriteMostly, &rdev->flags);
6542 if (info->state & (1<<MD_DISK_FAILFAST))
6543 set_bit(FailFast, &rdev->flags);
6545 if (!mddev->persistent) {
6546 pr_debug("md: nonpersistent superblock ...\n");
6547 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6549 rdev->sb_start = calc_dev_sboffset(rdev);
6550 rdev->sectors = rdev->sb_start;
6552 err = bind_rdev_to_array(rdev, mddev);
6562 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6564 char b[BDEVNAME_SIZE];
6565 struct md_rdev *rdev;
6570 rdev = find_rdev(mddev, dev);
6574 if (rdev->raid_disk < 0)
6577 clear_bit(Blocked, &rdev->flags);
6578 remove_and_add_spares(mddev, rdev);
6580 if (rdev->raid_disk >= 0)
6584 if (mddev_is_clustered(mddev)) {
6585 if (md_cluster_ops->remove_disk(mddev, rdev))
6589 md_kick_rdev_from_array(rdev);
6590 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6592 md_wakeup_thread(mddev->thread);
6594 md_update_sb(mddev, 1);
6595 md_new_event(mddev);
6599 pr_debug("md: cannot remove active disk %s from %s ...\n",
6600 bdevname(rdev->bdev,b), mdname(mddev));
6604 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6606 char b[BDEVNAME_SIZE];
6608 struct md_rdev *rdev;
6613 if (mddev->major_version != 0) {
6614 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6618 if (!mddev->pers->hot_add_disk) {
6619 pr_warn("%s: personality does not support diskops!\n",
6624 rdev = md_import_device(dev, -1, 0);
6626 pr_warn("md: error, md_import_device() returned %ld\n",
6631 if (mddev->persistent)
6632 rdev->sb_start = calc_dev_sboffset(rdev);
6634 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6636 rdev->sectors = rdev->sb_start;
6638 if (test_bit(Faulty, &rdev->flags)) {
6639 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6640 bdevname(rdev->bdev,b), mdname(mddev));
6645 clear_bit(In_sync, &rdev->flags);
6647 rdev->saved_raid_disk = -1;
6648 err = bind_rdev_to_array(rdev, mddev);
6653 * The rest should better be atomic, we can have disk failures
6654 * noticed in interrupt contexts ...
6657 rdev->raid_disk = -1;
6659 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6661 md_update_sb(mddev, 1);
6663 * Kick recovery, maybe this spare has to be added to the
6664 * array immediately.
6666 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6667 md_wakeup_thread(mddev->thread);
6668 md_new_event(mddev);
6676 static int set_bitmap_file(struct mddev *mddev, int fd)
6681 if (!mddev->pers->quiesce || !mddev->thread)
6683 if (mddev->recovery || mddev->sync_thread)
6685 /* we should be able to change the bitmap.. */
6689 struct inode *inode;
6692 if (mddev->bitmap || mddev->bitmap_info.file)
6693 return -EEXIST; /* cannot add when bitmap is present */
6697 pr_warn("%s: error: failed to get bitmap file\n",
6702 inode = f->f_mapping->host;
6703 if (!S_ISREG(inode->i_mode)) {
6704 pr_warn("%s: error: bitmap file must be a regular file\n",
6707 } else if (!(f->f_mode & FMODE_WRITE)) {
6708 pr_warn("%s: error: bitmap file must open for write\n",
6711 } else if (atomic_read(&inode->i_writecount) != 1) {
6712 pr_warn("%s: error: bitmap file is already in use\n",
6720 mddev->bitmap_info.file = f;
6721 mddev->bitmap_info.offset = 0; /* file overrides offset */
6722 } else if (mddev->bitmap == NULL)
6723 return -ENOENT; /* cannot remove what isn't there */
6727 struct bitmap *bitmap;
6729 bitmap = md_bitmap_create(mddev, -1);
6730 mddev_suspend(mddev);
6731 if (!IS_ERR(bitmap)) {
6732 mddev->bitmap = bitmap;
6733 err = md_bitmap_load(mddev);
6735 err = PTR_ERR(bitmap);
6737 md_bitmap_destroy(mddev);
6740 mddev_resume(mddev);
6741 } else if (fd < 0) {
6742 mddev_suspend(mddev);
6743 md_bitmap_destroy(mddev);
6744 mddev_resume(mddev);
6748 struct file *f = mddev->bitmap_info.file;
6750 spin_lock(&mddev->lock);
6751 mddev->bitmap_info.file = NULL;
6752 spin_unlock(&mddev->lock);
6761 * set_array_info is used two different ways
6762 * The original usage is when creating a new array.
6763 * In this usage, raid_disks is > 0 and it together with
6764 * level, size, not_persistent,layout,chunksize determine the
6765 * shape of the array.
6766 * This will always create an array with a type-0.90.0 superblock.
6767 * The newer usage is when assembling an array.
6768 * In this case raid_disks will be 0, and the major_version field is
6769 * use to determine which style super-blocks are to be found on the devices.
6770 * The minor and patch _version numbers are also kept incase the
6771 * super_block handler wishes to interpret them.
6773 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6776 if (info->raid_disks == 0) {
6777 /* just setting version number for superblock loading */
6778 if (info->major_version < 0 ||
6779 info->major_version >= ARRAY_SIZE(super_types) ||
6780 super_types[info->major_version].name == NULL) {
6781 /* maybe try to auto-load a module? */
6782 pr_warn("md: superblock version %d not known\n",
6783 info->major_version);
6786 mddev->major_version = info->major_version;
6787 mddev->minor_version = info->minor_version;
6788 mddev->patch_version = info->patch_version;
6789 mddev->persistent = !info->not_persistent;
6790 /* ensure mddev_put doesn't delete this now that there
6791 * is some minimal configuration.
6793 mddev->ctime = ktime_get_real_seconds();
6796 mddev->major_version = MD_MAJOR_VERSION;
6797 mddev->minor_version = MD_MINOR_VERSION;
6798 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6799 mddev->ctime = ktime_get_real_seconds();
6801 mddev->level = info->level;
6802 mddev->clevel[0] = 0;
6803 mddev->dev_sectors = 2 * (sector_t)info->size;
6804 mddev->raid_disks = info->raid_disks;
6805 /* don't set md_minor, it is determined by which /dev/md* was
6808 if (info->state & (1<<MD_SB_CLEAN))
6809 mddev->recovery_cp = MaxSector;
6811 mddev->recovery_cp = 0;
6812 mddev->persistent = ! info->not_persistent;
6813 mddev->external = 0;
6815 mddev->layout = info->layout;
6816 if (mddev->level == 0)
6817 /* Cannot trust RAID0 layout info here */
6819 mddev->chunk_sectors = info->chunk_size >> 9;
6821 if (mddev->persistent) {
6822 mddev->max_disks = MD_SB_DISKS;
6824 mddev->sb_flags = 0;
6826 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6828 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6829 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6830 mddev->bitmap_info.offset = 0;
6832 mddev->reshape_position = MaxSector;
6835 * Generate a 128 bit UUID
6837 get_random_bytes(mddev->uuid, 16);
6839 mddev->new_level = mddev->level;
6840 mddev->new_chunk_sectors = mddev->chunk_sectors;
6841 mddev->new_layout = mddev->layout;
6842 mddev->delta_disks = 0;
6843 mddev->reshape_backwards = 0;
6848 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6850 lockdep_assert_held(&mddev->reconfig_mutex);
6852 if (mddev->external_size)
6855 mddev->array_sectors = array_sectors;
6857 EXPORT_SYMBOL(md_set_array_sectors);
6859 static int update_size(struct mddev *mddev, sector_t num_sectors)
6861 struct md_rdev *rdev;
6863 int fit = (num_sectors == 0);
6864 sector_t old_dev_sectors = mddev->dev_sectors;
6866 if (mddev->pers->resize == NULL)
6868 /* The "num_sectors" is the number of sectors of each device that
6869 * is used. This can only make sense for arrays with redundancy.
6870 * linear and raid0 always use whatever space is available. We can only
6871 * consider changing this number if no resync or reconstruction is
6872 * happening, and if the new size is acceptable. It must fit before the
6873 * sb_start or, if that is <data_offset, it must fit before the size
6874 * of each device. If num_sectors is zero, we find the largest size
6877 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6883 rdev_for_each(rdev, mddev) {
6884 sector_t avail = rdev->sectors;
6886 if (fit && (num_sectors == 0 || num_sectors > avail))
6887 num_sectors = avail;
6888 if (avail < num_sectors)
6891 rv = mddev->pers->resize(mddev, num_sectors);
6893 if (mddev_is_clustered(mddev))
6894 md_cluster_ops->update_size(mddev, old_dev_sectors);
6895 else if (mddev->queue) {
6896 set_capacity(mddev->gendisk, mddev->array_sectors);
6897 revalidate_disk(mddev->gendisk);
6903 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6906 struct md_rdev *rdev;
6907 /* change the number of raid disks */
6908 if (mddev->pers->check_reshape == NULL)
6912 if (raid_disks <= 0 ||
6913 (mddev->max_disks && raid_disks >= mddev->max_disks))
6915 if (mddev->sync_thread ||
6916 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6917 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
6918 mddev->reshape_position != MaxSector)
6921 rdev_for_each(rdev, mddev) {
6922 if (mddev->raid_disks < raid_disks &&
6923 rdev->data_offset < rdev->new_data_offset)
6925 if (mddev->raid_disks > raid_disks &&
6926 rdev->data_offset > rdev->new_data_offset)
6930 mddev->delta_disks = raid_disks - mddev->raid_disks;
6931 if (mddev->delta_disks < 0)
6932 mddev->reshape_backwards = 1;
6933 else if (mddev->delta_disks > 0)
6934 mddev->reshape_backwards = 0;
6936 rv = mddev->pers->check_reshape(mddev);
6938 mddev->delta_disks = 0;
6939 mddev->reshape_backwards = 0;
6945 * update_array_info is used to change the configuration of an
6947 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6948 * fields in the info are checked against the array.
6949 * Any differences that cannot be handled will cause an error.
6950 * Normally, only one change can be managed at a time.
6952 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6958 /* calculate expected state,ignoring low bits */
6959 if (mddev->bitmap && mddev->bitmap_info.offset)
6960 state |= (1 << MD_SB_BITMAP_PRESENT);
6962 if (mddev->major_version != info->major_version ||
6963 mddev->minor_version != info->minor_version ||
6964 /* mddev->patch_version != info->patch_version || */
6965 mddev->ctime != info->ctime ||
6966 mddev->level != info->level ||
6967 /* mddev->layout != info->layout || */
6968 mddev->persistent != !info->not_persistent ||
6969 mddev->chunk_sectors != info->chunk_size >> 9 ||
6970 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6971 ((state^info->state) & 0xfffffe00)
6974 /* Check there is only one change */
6975 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6977 if (mddev->raid_disks != info->raid_disks)
6979 if (mddev->layout != info->layout)
6981 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6988 if (mddev->layout != info->layout) {
6990 * we don't need to do anything at the md level, the
6991 * personality will take care of it all.
6993 if (mddev->pers->check_reshape == NULL)
6996 mddev->new_layout = info->layout;
6997 rv = mddev->pers->check_reshape(mddev);
6999 mddev->new_layout = mddev->layout;
7003 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7004 rv = update_size(mddev, (sector_t)info->size * 2);
7006 if (mddev->raid_disks != info->raid_disks)
7007 rv = update_raid_disks(mddev, info->raid_disks);
7009 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7010 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7014 if (mddev->recovery || mddev->sync_thread) {
7018 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7019 struct bitmap *bitmap;
7020 /* add the bitmap */
7021 if (mddev->bitmap) {
7025 if (mddev->bitmap_info.default_offset == 0) {
7029 mddev->bitmap_info.offset =
7030 mddev->bitmap_info.default_offset;
7031 mddev->bitmap_info.space =
7032 mddev->bitmap_info.default_space;
7033 bitmap = md_bitmap_create(mddev, -1);
7034 mddev_suspend(mddev);
7035 if (!IS_ERR(bitmap)) {
7036 mddev->bitmap = bitmap;
7037 rv = md_bitmap_load(mddev);
7039 rv = PTR_ERR(bitmap);
7041 md_bitmap_destroy(mddev);
7042 mddev_resume(mddev);
7044 /* remove the bitmap */
7045 if (!mddev->bitmap) {
7049 if (mddev->bitmap->storage.file) {
7053 if (mddev->bitmap_info.nodes) {
7054 /* hold PW on all the bitmap lock */
7055 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7056 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7058 md_cluster_ops->unlock_all_bitmaps(mddev);
7062 mddev->bitmap_info.nodes = 0;
7063 md_cluster_ops->leave(mddev);
7065 mddev_suspend(mddev);
7066 md_bitmap_destroy(mddev);
7067 mddev_resume(mddev);
7068 mddev->bitmap_info.offset = 0;
7071 md_update_sb(mddev, 1);
7077 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7079 struct md_rdev *rdev;
7082 if (mddev->pers == NULL)
7086 rdev = md_find_rdev_rcu(mddev, dev);
7090 md_error(mddev, rdev);
7091 if (!test_bit(Faulty, &rdev->flags))
7099 * We have a problem here : there is no easy way to give a CHS
7100 * virtual geometry. We currently pretend that we have a 2 heads
7101 * 4 sectors (with a BIG number of cylinders...). This drives
7102 * dosfs just mad... ;-)
7104 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7106 struct mddev *mddev = bdev->bd_disk->private_data;
7110 geo->cylinders = mddev->array_sectors / 8;
7114 static inline bool md_ioctl_valid(unsigned int cmd)
7119 case GET_ARRAY_INFO:
7120 case GET_BITMAP_FILE:
7123 case HOT_REMOVE_DISK:
7126 case RESTART_ARRAY_RW:
7128 case SET_ARRAY_INFO:
7129 case SET_BITMAP_FILE:
7130 case SET_DISK_FAULTY:
7133 case CLUSTERED_DISK_NACK:
7140 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7141 unsigned int cmd, unsigned long arg)
7144 void __user *argp = (void __user *)arg;
7145 struct mddev *mddev = NULL;
7147 bool did_set_md_closing = false;
7149 if (!md_ioctl_valid(cmd))
7154 case GET_ARRAY_INFO:
7158 if (!capable(CAP_SYS_ADMIN))
7163 * Commands dealing with the RAID driver but not any
7168 err = get_version(argp);
7174 autostart_arrays(arg);
7181 * Commands creating/starting a new array:
7184 mddev = bdev->bd_disk->private_data;
7191 /* Some actions do not requires the mutex */
7193 case GET_ARRAY_INFO:
7194 if (!mddev->raid_disks && !mddev->external)
7197 err = get_array_info(mddev, argp);
7201 if (!mddev->raid_disks && !mddev->external)
7204 err = get_disk_info(mddev, argp);
7207 case SET_DISK_FAULTY:
7208 err = set_disk_faulty(mddev, new_decode_dev(arg));
7211 case GET_BITMAP_FILE:
7212 err = get_bitmap_file(mddev, argp);
7217 if (cmd == ADD_NEW_DISK)
7218 /* need to ensure md_delayed_delete() has completed */
7219 flush_workqueue(md_misc_wq);
7221 if (cmd == HOT_REMOVE_DISK)
7222 /* need to ensure recovery thread has run */
7223 wait_event_interruptible_timeout(mddev->sb_wait,
7224 !test_bit(MD_RECOVERY_NEEDED,
7226 msecs_to_jiffies(5000));
7227 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7228 /* Need to flush page cache, and ensure no-one else opens
7231 mutex_lock(&mddev->open_mutex);
7232 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7233 mutex_unlock(&mddev->open_mutex);
7237 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7238 mutex_unlock(&mddev->open_mutex);
7242 did_set_md_closing = true;
7243 mutex_unlock(&mddev->open_mutex);
7244 sync_blockdev(bdev);
7246 err = mddev_lock(mddev);
7248 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7253 if (cmd == SET_ARRAY_INFO) {
7254 mdu_array_info_t info;
7256 memset(&info, 0, sizeof(info));
7257 else if (copy_from_user(&info, argp, sizeof(info))) {
7262 err = update_array_info(mddev, &info);
7264 pr_warn("md: couldn't update array info. %d\n", err);
7269 if (!list_empty(&mddev->disks)) {
7270 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7274 if (mddev->raid_disks) {
7275 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7279 err = set_array_info(mddev, &info);
7281 pr_warn("md: couldn't set array info. %d\n", err);
7288 * Commands querying/configuring an existing array:
7290 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7291 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7292 if ((!mddev->raid_disks && !mddev->external)
7293 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7294 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7295 && cmd != GET_BITMAP_FILE) {
7301 * Commands even a read-only array can execute:
7304 case RESTART_ARRAY_RW:
7305 err = restart_array(mddev);
7309 err = do_md_stop(mddev, 0, bdev);
7313 err = md_set_readonly(mddev, bdev);
7316 case HOT_REMOVE_DISK:
7317 err = hot_remove_disk(mddev, new_decode_dev(arg));
7321 /* We can support ADD_NEW_DISK on read-only arrays
7322 * only if we are re-adding a preexisting device.
7323 * So require mddev->pers and MD_DISK_SYNC.
7326 mdu_disk_info_t info;
7327 if (copy_from_user(&info, argp, sizeof(info)))
7329 else if (!(info.state & (1<<MD_DISK_SYNC)))
7330 /* Need to clear read-only for this */
7333 err = add_new_disk(mddev, &info);
7339 if (get_user(ro, (int __user *)(arg))) {
7345 /* if the bdev is going readonly the value of mddev->ro
7346 * does not matter, no writes are coming
7351 /* are we are already prepared for writes? */
7355 /* transitioning to readauto need only happen for
7356 * arrays that call md_write_start
7359 err = restart_array(mddev);
7362 set_disk_ro(mddev->gendisk, 0);
7369 * The remaining ioctls are changing the state of the
7370 * superblock, so we do not allow them on read-only arrays.
7372 if (mddev->ro && mddev->pers) {
7373 if (mddev->ro == 2) {
7375 sysfs_notify_dirent_safe(mddev->sysfs_state);
7376 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7377 /* mddev_unlock will wake thread */
7378 /* If a device failed while we were read-only, we
7379 * need to make sure the metadata is updated now.
7381 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7382 mddev_unlock(mddev);
7383 wait_event(mddev->sb_wait,
7384 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7385 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7386 mddev_lock_nointr(mddev);
7397 mdu_disk_info_t info;
7398 if (copy_from_user(&info, argp, sizeof(info)))
7401 err = add_new_disk(mddev, &info);
7405 case CLUSTERED_DISK_NACK:
7406 if (mddev_is_clustered(mddev))
7407 md_cluster_ops->new_disk_ack(mddev, false);
7413 err = hot_add_disk(mddev, new_decode_dev(arg));
7417 err = do_md_run(mddev);
7420 case SET_BITMAP_FILE:
7421 err = set_bitmap_file(mddev, (int)arg);
7430 if (mddev->hold_active == UNTIL_IOCTL &&
7432 mddev->hold_active = 0;
7433 mddev_unlock(mddev);
7435 if(did_set_md_closing)
7436 clear_bit(MD_CLOSING, &mddev->flags);
7439 #ifdef CONFIG_COMPAT
7440 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7441 unsigned int cmd, unsigned long arg)
7444 case HOT_REMOVE_DISK:
7446 case SET_DISK_FAULTY:
7447 case SET_BITMAP_FILE:
7448 /* These take in integer arg, do not convert */
7451 arg = (unsigned long)compat_ptr(arg);
7455 return md_ioctl(bdev, mode, cmd, arg);
7457 #endif /* CONFIG_COMPAT */
7459 static int md_open(struct block_device *bdev, fmode_t mode)
7462 * Succeed if we can lock the mddev, which confirms that
7463 * it isn't being stopped right now.
7465 struct mddev *mddev = mddev_find(bdev->bd_dev);
7471 if (mddev->gendisk != bdev->bd_disk) {
7472 /* we are racing with mddev_put which is discarding this
7476 /* Wait until bdev->bd_disk is definitely gone */
7477 if (work_pending(&mddev->del_work))
7478 flush_workqueue(md_misc_wq);
7481 BUG_ON(mddev != bdev->bd_disk->private_data);
7483 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7486 if (test_bit(MD_CLOSING, &mddev->flags)) {
7487 mutex_unlock(&mddev->open_mutex);
7493 atomic_inc(&mddev->openers);
7494 mutex_unlock(&mddev->open_mutex);
7496 check_disk_change(bdev);
7503 static void md_release(struct gendisk *disk, fmode_t mode)
7505 struct mddev *mddev = disk->private_data;
7508 atomic_dec(&mddev->openers);
7512 static int md_media_changed(struct gendisk *disk)
7514 struct mddev *mddev = disk->private_data;
7516 return mddev->changed;
7519 static int md_revalidate(struct gendisk *disk)
7521 struct mddev *mddev = disk->private_data;
7526 static const struct block_device_operations md_fops =
7528 .owner = THIS_MODULE,
7530 .release = md_release,
7532 #ifdef CONFIG_COMPAT
7533 .compat_ioctl = md_compat_ioctl,
7535 .getgeo = md_getgeo,
7536 .media_changed = md_media_changed,
7537 .revalidate_disk= md_revalidate,
7540 static int md_thread(void *arg)
7542 struct md_thread *thread = arg;
7545 * md_thread is a 'system-thread', it's priority should be very
7546 * high. We avoid resource deadlocks individually in each
7547 * raid personality. (RAID5 does preallocation) We also use RR and
7548 * the very same RT priority as kswapd, thus we will never get
7549 * into a priority inversion deadlock.
7551 * we definitely have to have equal or higher priority than
7552 * bdflush, otherwise bdflush will deadlock if there are too
7553 * many dirty RAID5 blocks.
7556 allow_signal(SIGKILL);
7557 while (!kthread_should_stop()) {
7559 /* We need to wait INTERRUPTIBLE so that
7560 * we don't add to the load-average.
7561 * That means we need to be sure no signals are
7564 if (signal_pending(current))
7565 flush_signals(current);
7567 wait_event_interruptible_timeout
7569 test_bit(THREAD_WAKEUP, &thread->flags)
7570 || kthread_should_stop() || kthread_should_park(),
7573 clear_bit(THREAD_WAKEUP, &thread->flags);
7574 if (kthread_should_park())
7576 if (!kthread_should_stop())
7577 thread->run(thread);
7583 void md_wakeup_thread(struct md_thread *thread)
7586 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7587 set_bit(THREAD_WAKEUP, &thread->flags);
7588 wake_up(&thread->wqueue);
7591 EXPORT_SYMBOL(md_wakeup_thread);
7593 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7594 struct mddev *mddev, const char *name)
7596 struct md_thread *thread;
7598 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7602 init_waitqueue_head(&thread->wqueue);
7605 thread->mddev = mddev;
7606 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7607 thread->tsk = kthread_run(md_thread, thread,
7609 mdname(thread->mddev),
7611 if (IS_ERR(thread->tsk)) {
7617 EXPORT_SYMBOL(md_register_thread);
7619 void md_unregister_thread(struct md_thread **threadp)
7621 struct md_thread *thread = *threadp;
7624 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7625 /* Locking ensures that mddev_unlock does not wake_up a
7626 * non-existent thread
7628 spin_lock(&pers_lock);
7630 spin_unlock(&pers_lock);
7632 kthread_stop(thread->tsk);
7635 EXPORT_SYMBOL(md_unregister_thread);
7637 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7639 if (!rdev || test_bit(Faulty, &rdev->flags))
7642 if (!mddev->pers || !mddev->pers->error_handler)
7644 mddev->pers->error_handler(mddev,rdev);
7645 if (mddev->degraded)
7646 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7647 sysfs_notify_dirent_safe(rdev->sysfs_state);
7648 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7649 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7650 md_wakeup_thread(mddev->thread);
7651 if (mddev->event_work.func)
7652 queue_work(md_misc_wq, &mddev->event_work);
7653 md_new_event(mddev);
7655 EXPORT_SYMBOL(md_error);
7657 /* seq_file implementation /proc/mdstat */
7659 static void status_unused(struct seq_file *seq)
7662 struct md_rdev *rdev;
7664 seq_printf(seq, "unused devices: ");
7666 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7667 char b[BDEVNAME_SIZE];
7669 seq_printf(seq, "%s ",
7670 bdevname(rdev->bdev,b));
7673 seq_printf(seq, "<none>");
7675 seq_printf(seq, "\n");
7678 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7680 sector_t max_sectors, resync, res;
7681 unsigned long dt, db = 0;
7682 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7683 int scale, recovery_active;
7684 unsigned int per_milli;
7686 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7687 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7688 max_sectors = mddev->resync_max_sectors;
7690 max_sectors = mddev->dev_sectors;
7692 resync = mddev->curr_resync;
7694 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7695 /* Still cleaning up */
7696 resync = max_sectors;
7697 } else if (resync > max_sectors)
7698 resync = max_sectors;
7700 resync -= atomic_read(&mddev->recovery_active);
7703 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
7704 struct md_rdev *rdev;
7706 rdev_for_each(rdev, mddev)
7707 if (rdev->raid_disk >= 0 &&
7708 !test_bit(Faulty, &rdev->flags) &&
7709 rdev->recovery_offset != MaxSector &&
7710 rdev->recovery_offset) {
7711 seq_printf(seq, "\trecover=REMOTE");
7714 if (mddev->reshape_position != MaxSector)
7715 seq_printf(seq, "\treshape=REMOTE");
7717 seq_printf(seq, "\tresync=REMOTE");
7720 if (mddev->recovery_cp < MaxSector) {
7721 seq_printf(seq, "\tresync=PENDING");
7727 seq_printf(seq, "\tresync=DELAYED");
7731 WARN_ON(max_sectors == 0);
7732 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7733 * in a sector_t, and (max_sectors>>scale) will fit in a
7734 * u32, as those are the requirements for sector_div.
7735 * Thus 'scale' must be at least 10
7738 if (sizeof(sector_t) > sizeof(unsigned long)) {
7739 while ( max_sectors/2 > (1ULL<<(scale+32)))
7742 res = (resync>>scale)*1000;
7743 sector_div(res, (u32)((max_sectors>>scale)+1));
7747 int i, x = per_milli/50, y = 20-x;
7748 seq_printf(seq, "[");
7749 for (i = 0; i < x; i++)
7750 seq_printf(seq, "=");
7751 seq_printf(seq, ">");
7752 for (i = 0; i < y; i++)
7753 seq_printf(seq, ".");
7754 seq_printf(seq, "] ");
7756 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7757 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7759 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7761 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7762 "resync" : "recovery"))),
7763 per_milli/10, per_milli % 10,
7764 (unsigned long long) resync/2,
7765 (unsigned long long) max_sectors/2);
7768 * dt: time from mark until now
7769 * db: blocks written from mark until now
7770 * rt: remaining time
7772 * rt is a sector_t, which is always 64bit now. We are keeping
7773 * the original algorithm, but it is not really necessary.
7775 * Original algorithm:
7776 * So we divide before multiply in case it is 32bit and close
7778 * We scale the divisor (db) by 32 to avoid losing precision
7779 * near the end of resync when the number of remaining sectors
7781 * We then divide rt by 32 after multiplying by db to compensate.
7782 * The '+1' avoids division by zero if db is very small.
7784 dt = ((jiffies - mddev->resync_mark) / HZ);
7787 curr_mark_cnt = mddev->curr_mark_cnt;
7788 recovery_active = atomic_read(&mddev->recovery_active);
7789 resync_mark_cnt = mddev->resync_mark_cnt;
7791 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7792 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7794 rt = max_sectors - resync; /* number of remaining sectors */
7795 rt = div64_u64(rt, db/32+1);
7799 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7800 ((unsigned long)rt % 60)/6);
7802 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7806 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7808 struct list_head *tmp;
7810 struct mddev *mddev;
7822 spin_lock(&all_mddevs_lock);
7823 list_for_each(tmp,&all_mddevs)
7825 mddev = list_entry(tmp, struct mddev, all_mddevs);
7827 spin_unlock(&all_mddevs_lock);
7830 spin_unlock(&all_mddevs_lock);
7832 return (void*)2;/* tail */
7836 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7838 struct list_head *tmp;
7839 struct mddev *next_mddev, *mddev = v;
7845 spin_lock(&all_mddevs_lock);
7847 tmp = all_mddevs.next;
7849 tmp = mddev->all_mddevs.next;
7850 if (tmp != &all_mddevs)
7851 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7853 next_mddev = (void*)2;
7856 spin_unlock(&all_mddevs_lock);
7864 static void md_seq_stop(struct seq_file *seq, void *v)
7866 struct mddev *mddev = v;
7868 if (mddev && v != (void*)1 && v != (void*)2)
7872 static int md_seq_show(struct seq_file *seq, void *v)
7874 struct mddev *mddev = v;
7876 struct md_rdev *rdev;
7878 if (v == (void*)1) {
7879 struct md_personality *pers;
7880 seq_printf(seq, "Personalities : ");
7881 spin_lock(&pers_lock);
7882 list_for_each_entry(pers, &pers_list, list)
7883 seq_printf(seq, "[%s] ", pers->name);
7885 spin_unlock(&pers_lock);
7886 seq_printf(seq, "\n");
7887 seq->poll_event = atomic_read(&md_event_count);
7890 if (v == (void*)2) {
7895 spin_lock(&mddev->lock);
7896 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7897 seq_printf(seq, "%s : %sactive", mdname(mddev),
7898 mddev->pers ? "" : "in");
7901 seq_printf(seq, " (read-only)");
7903 seq_printf(seq, " (auto-read-only)");
7904 seq_printf(seq, " %s", mddev->pers->name);
7909 rdev_for_each_rcu(rdev, mddev) {
7910 char b[BDEVNAME_SIZE];
7911 seq_printf(seq, " %s[%d]",
7912 bdevname(rdev->bdev,b), rdev->desc_nr);
7913 if (test_bit(WriteMostly, &rdev->flags))
7914 seq_printf(seq, "(W)");
7915 if (test_bit(Journal, &rdev->flags))
7916 seq_printf(seq, "(J)");
7917 if (test_bit(Faulty, &rdev->flags)) {
7918 seq_printf(seq, "(F)");
7921 if (rdev->raid_disk < 0)
7922 seq_printf(seq, "(S)"); /* spare */
7923 if (test_bit(Replacement, &rdev->flags))
7924 seq_printf(seq, "(R)");
7925 sectors += rdev->sectors;
7929 if (!list_empty(&mddev->disks)) {
7931 seq_printf(seq, "\n %llu blocks",
7932 (unsigned long long)
7933 mddev->array_sectors / 2);
7935 seq_printf(seq, "\n %llu blocks",
7936 (unsigned long long)sectors / 2);
7938 if (mddev->persistent) {
7939 if (mddev->major_version != 0 ||
7940 mddev->minor_version != 90) {
7941 seq_printf(seq," super %d.%d",
7942 mddev->major_version,
7943 mddev->minor_version);
7945 } else if (mddev->external)
7946 seq_printf(seq, " super external:%s",
7947 mddev->metadata_type);
7949 seq_printf(seq, " super non-persistent");
7952 mddev->pers->status(seq, mddev);
7953 seq_printf(seq, "\n ");
7954 if (mddev->pers->sync_request) {
7955 if (status_resync(seq, mddev))
7956 seq_printf(seq, "\n ");
7959 seq_printf(seq, "\n ");
7961 md_bitmap_status(seq, mddev->bitmap);
7963 seq_printf(seq, "\n");
7965 spin_unlock(&mddev->lock);
7970 static const struct seq_operations md_seq_ops = {
7971 .start = md_seq_start,
7972 .next = md_seq_next,
7973 .stop = md_seq_stop,
7974 .show = md_seq_show,
7977 static int md_seq_open(struct inode *inode, struct file *file)
7979 struct seq_file *seq;
7982 error = seq_open(file, &md_seq_ops);
7986 seq = file->private_data;
7987 seq->poll_event = atomic_read(&md_event_count);
7991 static int md_unloading;
7992 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
7994 struct seq_file *seq = filp->private_data;
7998 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
7999 poll_wait(filp, &md_event_waiters, wait);
8001 /* always allow read */
8002 mask = EPOLLIN | EPOLLRDNORM;
8004 if (seq->poll_event != atomic_read(&md_event_count))
8005 mask |= EPOLLERR | EPOLLPRI;
8009 static const struct file_operations md_seq_fops = {
8010 .owner = THIS_MODULE,
8011 .open = md_seq_open,
8013 .llseek = seq_lseek,
8014 .release = seq_release,
8015 .poll = mdstat_poll,
8018 int register_md_personality(struct md_personality *p)
8020 pr_debug("md: %s personality registered for level %d\n",
8022 spin_lock(&pers_lock);
8023 list_add_tail(&p->list, &pers_list);
8024 spin_unlock(&pers_lock);
8027 EXPORT_SYMBOL(register_md_personality);
8029 int unregister_md_personality(struct md_personality *p)
8031 pr_debug("md: %s personality unregistered\n", p->name);
8032 spin_lock(&pers_lock);
8033 list_del_init(&p->list);
8034 spin_unlock(&pers_lock);
8037 EXPORT_SYMBOL(unregister_md_personality);
8039 int register_md_cluster_operations(struct md_cluster_operations *ops,
8040 struct module *module)
8043 spin_lock(&pers_lock);
8044 if (md_cluster_ops != NULL)
8047 md_cluster_ops = ops;
8048 md_cluster_mod = module;
8050 spin_unlock(&pers_lock);
8053 EXPORT_SYMBOL(register_md_cluster_operations);
8055 int unregister_md_cluster_operations(void)
8057 spin_lock(&pers_lock);
8058 md_cluster_ops = NULL;
8059 spin_unlock(&pers_lock);
8062 EXPORT_SYMBOL(unregister_md_cluster_operations);
8064 int md_setup_cluster(struct mddev *mddev, int nodes)
8066 if (!md_cluster_ops)
8067 request_module("md-cluster");
8068 spin_lock(&pers_lock);
8069 /* ensure module won't be unloaded */
8070 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8071 pr_warn("can't find md-cluster module or get it's reference.\n");
8072 spin_unlock(&pers_lock);
8075 spin_unlock(&pers_lock);
8077 return md_cluster_ops->join(mddev, nodes);
8080 void md_cluster_stop(struct mddev *mddev)
8082 if (!md_cluster_ops)
8084 md_cluster_ops->leave(mddev);
8085 module_put(md_cluster_mod);
8088 static int is_mddev_idle(struct mddev *mddev, int init)
8090 struct md_rdev *rdev;
8096 rdev_for_each_rcu(rdev, mddev) {
8097 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8098 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8099 atomic_read(&disk->sync_io);
8100 /* sync IO will cause sync_io to increase before the disk_stats
8101 * as sync_io is counted when a request starts, and
8102 * disk_stats is counted when it completes.
8103 * So resync activity will cause curr_events to be smaller than
8104 * when there was no such activity.
8105 * non-sync IO will cause disk_stat to increase without
8106 * increasing sync_io so curr_events will (eventually)
8107 * be larger than it was before. Once it becomes
8108 * substantially larger, the test below will cause
8109 * the array to appear non-idle, and resync will slow
8111 * If there is a lot of outstanding resync activity when
8112 * we set last_event to curr_events, then all that activity
8113 * completing might cause the array to appear non-idle
8114 * and resync will be slowed down even though there might
8115 * not have been non-resync activity. This will only
8116 * happen once though. 'last_events' will soon reflect
8117 * the state where there is little or no outstanding
8118 * resync requests, and further resync activity will
8119 * always make curr_events less than last_events.
8122 if (init || curr_events - rdev->last_events > 64) {
8123 rdev->last_events = curr_events;
8131 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8133 /* another "blocks" (512byte) blocks have been synced */
8134 atomic_sub(blocks, &mddev->recovery_active);
8135 wake_up(&mddev->recovery_wait);
8137 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8138 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8139 md_wakeup_thread(mddev->thread);
8140 // stop recovery, signal do_sync ....
8143 EXPORT_SYMBOL(md_done_sync);
8145 /* md_write_start(mddev, bi)
8146 * If we need to update some array metadata (e.g. 'active' flag
8147 * in superblock) before writing, schedule a superblock update
8148 * and wait for it to complete.
8149 * A return value of 'false' means that the write wasn't recorded
8150 * and cannot proceed as the array is being suspend.
8152 bool md_write_start(struct mddev *mddev, struct bio *bi)
8156 if (bio_data_dir(bi) != WRITE)
8159 BUG_ON(mddev->ro == 1);
8160 if (mddev->ro == 2) {
8161 /* need to switch to read/write */
8163 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8164 md_wakeup_thread(mddev->thread);
8165 md_wakeup_thread(mddev->sync_thread);
8169 percpu_ref_get(&mddev->writes_pending);
8170 smp_mb(); /* Match smp_mb in set_in_sync() */
8171 if (mddev->safemode == 1)
8172 mddev->safemode = 0;
8173 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8174 if (mddev->in_sync || mddev->sync_checkers) {
8175 spin_lock(&mddev->lock);
8176 if (mddev->in_sync) {
8178 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8179 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8180 md_wakeup_thread(mddev->thread);
8183 spin_unlock(&mddev->lock);
8187 sysfs_notify_dirent_safe(mddev->sysfs_state);
8188 if (!mddev->has_superblocks)
8190 wait_event(mddev->sb_wait,
8191 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8193 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8194 percpu_ref_put(&mddev->writes_pending);
8199 EXPORT_SYMBOL(md_write_start);
8201 /* md_write_inc can only be called when md_write_start() has
8202 * already been called at least once of the current request.
8203 * It increments the counter and is useful when a single request
8204 * is split into several parts. Each part causes an increment and
8205 * so needs a matching md_write_end().
8206 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8207 * a spinlocked region.
8209 void md_write_inc(struct mddev *mddev, struct bio *bi)
8211 if (bio_data_dir(bi) != WRITE)
8213 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8214 percpu_ref_get(&mddev->writes_pending);
8216 EXPORT_SYMBOL(md_write_inc);
8218 void md_write_end(struct mddev *mddev)
8220 percpu_ref_put(&mddev->writes_pending);
8222 if (mddev->safemode == 2)
8223 md_wakeup_thread(mddev->thread);
8224 else if (mddev->safemode_delay)
8225 /* The roundup() ensures this only performs locking once
8226 * every ->safemode_delay jiffies
8228 mod_timer(&mddev->safemode_timer,
8229 roundup(jiffies, mddev->safemode_delay) +
8230 mddev->safemode_delay);
8233 EXPORT_SYMBOL(md_write_end);
8235 /* md_allow_write(mddev)
8236 * Calling this ensures that the array is marked 'active' so that writes
8237 * may proceed without blocking. It is important to call this before
8238 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8239 * Must be called with mddev_lock held.
8241 void md_allow_write(struct mddev *mddev)
8247 if (!mddev->pers->sync_request)
8250 spin_lock(&mddev->lock);
8251 if (mddev->in_sync) {
8253 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8254 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8255 if (mddev->safemode_delay &&
8256 mddev->safemode == 0)
8257 mddev->safemode = 1;
8258 spin_unlock(&mddev->lock);
8259 md_update_sb(mddev, 0);
8260 sysfs_notify_dirent_safe(mddev->sysfs_state);
8261 /* wait for the dirty state to be recorded in the metadata */
8262 wait_event(mddev->sb_wait,
8263 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8265 spin_unlock(&mddev->lock);
8267 EXPORT_SYMBOL_GPL(md_allow_write);
8269 #define SYNC_MARKS 10
8270 #define SYNC_MARK_STEP (3*HZ)
8271 #define UPDATE_FREQUENCY (5*60*HZ)
8272 void md_do_sync(struct md_thread *thread)
8274 struct mddev *mddev = thread->mddev;
8275 struct mddev *mddev2;
8276 unsigned int currspeed = 0,
8278 sector_t max_sectors,j, io_sectors, recovery_done;
8279 unsigned long mark[SYNC_MARKS];
8280 unsigned long update_time;
8281 sector_t mark_cnt[SYNC_MARKS];
8283 struct list_head *tmp;
8284 sector_t last_check;
8286 struct md_rdev *rdev;
8287 char *desc, *action = NULL;
8288 struct blk_plug plug;
8291 /* just incase thread restarts... */
8292 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8293 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8295 if (mddev->ro) {/* never try to sync a read-only array */
8296 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8300 if (mddev_is_clustered(mddev)) {
8301 ret = md_cluster_ops->resync_start(mddev);
8305 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8306 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8307 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8308 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8309 && ((unsigned long long)mddev->curr_resync_completed
8310 < (unsigned long long)mddev->resync_max_sectors))
8314 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8315 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8316 desc = "data-check";
8318 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8319 desc = "requested-resync";
8323 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8328 mddev->last_sync_action = action ?: desc;
8330 /* we overload curr_resync somewhat here.
8331 * 0 == not engaged in resync at all
8332 * 2 == checking that there is no conflict with another sync
8333 * 1 == like 2, but have yielded to allow conflicting resync to
8335 * other == active in resync - this many blocks
8337 * Before starting a resync we must have set curr_resync to
8338 * 2, and then checked that every "conflicting" array has curr_resync
8339 * less than ours. When we find one that is the same or higher
8340 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8341 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8342 * This will mean we have to start checking from the beginning again.
8347 int mddev2_minor = -1;
8348 mddev->curr_resync = 2;
8351 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8353 for_each_mddev(mddev2, tmp) {
8354 if (mddev2 == mddev)
8356 if (!mddev->parallel_resync
8357 && mddev2->curr_resync
8358 && match_mddev_units(mddev, mddev2)) {
8360 if (mddev < mddev2 && mddev->curr_resync == 2) {
8361 /* arbitrarily yield */
8362 mddev->curr_resync = 1;
8363 wake_up(&resync_wait);
8365 if (mddev > mddev2 && mddev->curr_resync == 1)
8366 /* no need to wait here, we can wait the next
8367 * time 'round when curr_resync == 2
8370 /* We need to wait 'interruptible' so as not to
8371 * contribute to the load average, and not to
8372 * be caught by 'softlockup'
8374 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8375 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8376 mddev2->curr_resync >= mddev->curr_resync) {
8377 if (mddev2_minor != mddev2->md_minor) {
8378 mddev2_minor = mddev2->md_minor;
8379 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8380 desc, mdname(mddev),
8384 if (signal_pending(current))
8385 flush_signals(current);
8387 finish_wait(&resync_wait, &wq);
8390 finish_wait(&resync_wait, &wq);
8393 } while (mddev->curr_resync < 2);
8396 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8397 /* resync follows the size requested by the personality,
8398 * which defaults to physical size, but can be virtual size
8400 max_sectors = mddev->resync_max_sectors;
8401 atomic64_set(&mddev->resync_mismatches, 0);
8402 /* we don't use the checkpoint if there's a bitmap */
8403 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8404 j = mddev->resync_min;
8405 else if (!mddev->bitmap)
8406 j = mddev->recovery_cp;
8408 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8409 max_sectors = mddev->resync_max_sectors;
8411 /* recovery follows the physical size of devices */
8412 max_sectors = mddev->dev_sectors;
8415 rdev_for_each_rcu(rdev, mddev)
8416 if (rdev->raid_disk >= 0 &&
8417 !test_bit(Journal, &rdev->flags) &&
8418 !test_bit(Faulty, &rdev->flags) &&
8419 !test_bit(In_sync, &rdev->flags) &&
8420 rdev->recovery_offset < j)
8421 j = rdev->recovery_offset;
8424 /* If there is a bitmap, we need to make sure all
8425 * writes that started before we added a spare
8426 * complete before we start doing a recovery.
8427 * Otherwise the write might complete and (via
8428 * bitmap_endwrite) set a bit in the bitmap after the
8429 * recovery has checked that bit and skipped that
8432 if (mddev->bitmap) {
8433 mddev->pers->quiesce(mddev, 1);
8434 mddev->pers->quiesce(mddev, 0);
8438 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8439 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8440 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8441 speed_max(mddev), desc);
8443 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8446 for (m = 0; m < SYNC_MARKS; m++) {
8448 mark_cnt[m] = io_sectors;
8451 mddev->resync_mark = mark[last_mark];
8452 mddev->resync_mark_cnt = mark_cnt[last_mark];
8455 * Tune reconstruction:
8457 window = 32*(PAGE_SIZE/512);
8458 pr_debug("md: using %dk window, over a total of %lluk.\n",
8459 window/2, (unsigned long long)max_sectors/2);
8461 atomic_set(&mddev->recovery_active, 0);
8465 pr_debug("md: resuming %s of %s from checkpoint.\n",
8466 desc, mdname(mddev));
8467 mddev->curr_resync = j;
8469 mddev->curr_resync = 3; /* no longer delayed */
8470 mddev->curr_resync_completed = j;
8471 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8472 md_new_event(mddev);
8473 update_time = jiffies;
8475 blk_start_plug(&plug);
8476 while (j < max_sectors) {
8481 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8482 ((mddev->curr_resync > mddev->curr_resync_completed &&
8483 (mddev->curr_resync - mddev->curr_resync_completed)
8484 > (max_sectors >> 4)) ||
8485 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8486 (j - mddev->curr_resync_completed)*2
8487 >= mddev->resync_max - mddev->curr_resync_completed ||
8488 mddev->curr_resync_completed > mddev->resync_max
8490 /* time to update curr_resync_completed */
8491 wait_event(mddev->recovery_wait,
8492 atomic_read(&mddev->recovery_active) == 0);
8493 mddev->curr_resync_completed = j;
8494 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8495 j > mddev->recovery_cp)
8496 mddev->recovery_cp = j;
8497 update_time = jiffies;
8498 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8499 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8502 while (j >= mddev->resync_max &&
8503 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8504 /* As this condition is controlled by user-space,
8505 * we can block indefinitely, so use '_interruptible'
8506 * to avoid triggering warnings.
8508 flush_signals(current); /* just in case */
8509 wait_event_interruptible(mddev->recovery_wait,
8510 mddev->resync_max > j
8511 || test_bit(MD_RECOVERY_INTR,
8515 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8518 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8520 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8524 if (!skipped) { /* actual IO requested */
8525 io_sectors += sectors;
8526 atomic_add(sectors, &mddev->recovery_active);
8529 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8533 if (j > max_sectors)
8534 /* when skipping, extra large numbers can be returned. */
8537 mddev->curr_resync = j;
8538 mddev->curr_mark_cnt = io_sectors;
8539 if (last_check == 0)
8540 /* this is the earliest that rebuild will be
8541 * visible in /proc/mdstat
8543 md_new_event(mddev);
8545 if (last_check + window > io_sectors || j == max_sectors)
8548 last_check = io_sectors;
8550 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8552 int next = (last_mark+1) % SYNC_MARKS;
8554 mddev->resync_mark = mark[next];
8555 mddev->resync_mark_cnt = mark_cnt[next];
8556 mark[next] = jiffies;
8557 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8561 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8565 * this loop exits only if either when we are slower than
8566 * the 'hard' speed limit, or the system was IO-idle for
8568 * the system might be non-idle CPU-wise, but we only care
8569 * about not overloading the IO subsystem. (things like an
8570 * e2fsck being done on the RAID array should execute fast)
8574 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8575 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8576 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8578 if (currspeed > speed_min(mddev)) {
8579 if (currspeed > speed_max(mddev)) {
8583 if (!is_mddev_idle(mddev, 0)) {
8585 * Give other IO more of a chance.
8586 * The faster the devices, the less we wait.
8588 wait_event(mddev->recovery_wait,
8589 !atomic_read(&mddev->recovery_active));
8593 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8594 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8595 ? "interrupted" : "done");
8597 * this also signals 'finished resyncing' to md_stop
8599 blk_finish_plug(&plug);
8600 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8602 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8603 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8604 mddev->curr_resync > 3) {
8605 mddev->curr_resync_completed = mddev->curr_resync;
8606 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8608 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8610 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8611 mddev->curr_resync > 3) {
8612 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8613 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8614 if (mddev->curr_resync >= mddev->recovery_cp) {
8615 pr_debug("md: checkpointing %s of %s.\n",
8616 desc, mdname(mddev));
8617 if (test_bit(MD_RECOVERY_ERROR,
8619 mddev->recovery_cp =
8620 mddev->curr_resync_completed;
8622 mddev->recovery_cp =
8626 mddev->recovery_cp = MaxSector;
8628 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8629 mddev->curr_resync = MaxSector;
8630 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8631 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
8633 rdev_for_each_rcu(rdev, mddev)
8634 if (rdev->raid_disk >= 0 &&
8635 mddev->delta_disks >= 0 &&
8636 !test_bit(Journal, &rdev->flags) &&
8637 !test_bit(Faulty, &rdev->flags) &&
8638 !test_bit(In_sync, &rdev->flags) &&
8639 rdev->recovery_offset < mddev->curr_resync)
8640 rdev->recovery_offset = mddev->curr_resync;
8646 /* set CHANGE_PENDING here since maybe another update is needed,
8647 * so other nodes are informed. It should be harmless for normal
8649 set_mask_bits(&mddev->sb_flags, 0,
8650 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8652 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8653 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8654 mddev->delta_disks > 0 &&
8655 mddev->pers->finish_reshape &&
8656 mddev->pers->size &&
8658 mddev_lock_nointr(mddev);
8659 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8660 mddev_unlock(mddev);
8661 set_capacity(mddev->gendisk, mddev->array_sectors);
8662 revalidate_disk(mddev->gendisk);
8665 spin_lock(&mddev->lock);
8666 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8667 /* We completed so min/max setting can be forgotten if used. */
8668 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8669 mddev->resync_min = 0;
8670 mddev->resync_max = MaxSector;
8671 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8672 mddev->resync_min = mddev->curr_resync_completed;
8673 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8674 mddev->curr_resync = 0;
8675 spin_unlock(&mddev->lock);
8677 wake_up(&resync_wait);
8678 md_wakeup_thread(mddev->thread);
8681 EXPORT_SYMBOL_GPL(md_do_sync);
8683 static int remove_and_add_spares(struct mddev *mddev,
8684 struct md_rdev *this)
8686 struct md_rdev *rdev;
8689 bool remove_some = false;
8691 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8692 /* Mustn't remove devices when resync thread is running */
8695 rdev_for_each(rdev, mddev) {
8696 if ((this == NULL || rdev == this) &&
8697 rdev->raid_disk >= 0 &&
8698 !test_bit(Blocked, &rdev->flags) &&
8699 test_bit(Faulty, &rdev->flags) &&
8700 atomic_read(&rdev->nr_pending)==0) {
8701 /* Faulty non-Blocked devices with nr_pending == 0
8702 * never get nr_pending incremented,
8703 * never get Faulty cleared, and never get Blocked set.
8704 * So we can synchronize_rcu now rather than once per device
8707 set_bit(RemoveSynchronized, &rdev->flags);
8713 rdev_for_each(rdev, mddev) {
8714 if ((this == NULL || rdev == this) &&
8715 rdev->raid_disk >= 0 &&
8716 !test_bit(Blocked, &rdev->flags) &&
8717 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8718 (!test_bit(In_sync, &rdev->flags) &&
8719 !test_bit(Journal, &rdev->flags))) &&
8720 atomic_read(&rdev->nr_pending)==0)) {
8721 if (mddev->pers->hot_remove_disk(
8722 mddev, rdev) == 0) {
8723 sysfs_unlink_rdev(mddev, rdev);
8724 rdev->saved_raid_disk = rdev->raid_disk;
8725 rdev->raid_disk = -1;
8729 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8730 clear_bit(RemoveSynchronized, &rdev->flags);
8733 if (removed && mddev->kobj.sd)
8734 sysfs_notify(&mddev->kobj, NULL, "degraded");
8736 if (this && removed)
8739 rdev_for_each(rdev, mddev) {
8740 if (this && this != rdev)
8742 if (test_bit(Candidate, &rdev->flags))
8744 if (rdev->raid_disk >= 0 &&
8745 !test_bit(In_sync, &rdev->flags) &&
8746 !test_bit(Journal, &rdev->flags) &&
8747 !test_bit(Faulty, &rdev->flags))
8749 if (rdev->raid_disk >= 0)
8751 if (test_bit(Faulty, &rdev->flags))
8753 if (!test_bit(Journal, &rdev->flags)) {
8755 ! (rdev->saved_raid_disk >= 0 &&
8756 !test_bit(Bitmap_sync, &rdev->flags)))
8759 rdev->recovery_offset = 0;
8762 hot_add_disk(mddev, rdev) == 0) {
8763 if (sysfs_link_rdev(mddev, rdev))
8764 /* failure here is OK */;
8765 if (!test_bit(Journal, &rdev->flags))
8767 md_new_event(mddev);
8768 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8773 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8777 static void md_start_sync(struct work_struct *ws)
8779 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8781 mddev->sync_thread = md_register_thread(md_do_sync,
8784 if (!mddev->sync_thread) {
8785 pr_warn("%s: could not start resync thread...\n",
8787 /* leave the spares where they are, it shouldn't hurt */
8788 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8789 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8790 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8791 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8792 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8793 wake_up(&resync_wait);
8794 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8796 if (mddev->sysfs_action)
8797 sysfs_notify_dirent_safe(mddev->sysfs_action);
8799 md_wakeup_thread(mddev->sync_thread);
8800 sysfs_notify_dirent_safe(mddev->sysfs_action);
8801 md_new_event(mddev);
8805 * This routine is regularly called by all per-raid-array threads to
8806 * deal with generic issues like resync and super-block update.
8807 * Raid personalities that don't have a thread (linear/raid0) do not
8808 * need this as they never do any recovery or update the superblock.
8810 * It does not do any resync itself, but rather "forks" off other threads
8811 * to do that as needed.
8812 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8813 * "->recovery" and create a thread at ->sync_thread.
8814 * When the thread finishes it sets MD_RECOVERY_DONE
8815 * and wakeups up this thread which will reap the thread and finish up.
8816 * This thread also removes any faulty devices (with nr_pending == 0).
8818 * The overall approach is:
8819 * 1/ if the superblock needs updating, update it.
8820 * 2/ If a recovery thread is running, don't do anything else.
8821 * 3/ If recovery has finished, clean up, possibly marking spares active.
8822 * 4/ If there are any faulty devices, remove them.
8823 * 5/ If array is degraded, try to add spares devices
8824 * 6/ If array has spares or is not in-sync, start a resync thread.
8826 void md_check_recovery(struct mddev *mddev)
8828 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8829 /* Write superblock - thread that called mddev_suspend()
8830 * holds reconfig_mutex for us.
8832 set_bit(MD_UPDATING_SB, &mddev->flags);
8833 smp_mb__after_atomic();
8834 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8835 md_update_sb(mddev, 0);
8836 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8837 wake_up(&mddev->sb_wait);
8840 if (mddev->suspended)
8844 md_bitmap_daemon_work(mddev);
8846 if (signal_pending(current)) {
8847 if (mddev->pers->sync_request && !mddev->external) {
8848 pr_debug("md: %s in immediate safe mode\n",
8850 mddev->safemode = 2;
8852 flush_signals(current);
8855 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8858 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8859 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8860 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8861 (mddev->external == 0 && mddev->safemode == 1) ||
8862 (mddev->safemode == 2
8863 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8867 if (mddev_trylock(mddev)) {
8869 bool try_set_sync = mddev->safemode != 0;
8871 if (!mddev->external && mddev->safemode == 1)
8872 mddev->safemode = 0;
8875 struct md_rdev *rdev;
8876 if (!mddev->external && mddev->in_sync)
8877 /* 'Blocked' flag not needed as failed devices
8878 * will be recorded if array switched to read/write.
8879 * Leaving it set will prevent the device
8880 * from being removed.
8882 rdev_for_each(rdev, mddev)
8883 clear_bit(Blocked, &rdev->flags);
8884 /* On a read-only array we can:
8885 * - remove failed devices
8886 * - add already-in_sync devices if the array itself
8888 * As we only add devices that are already in-sync,
8889 * we can activate the spares immediately.
8891 remove_and_add_spares(mddev, NULL);
8892 /* There is no thread, but we need to call
8893 * ->spare_active and clear saved_raid_disk
8895 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8896 md_reap_sync_thread(mddev);
8897 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8898 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8899 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8903 if (mddev_is_clustered(mddev)) {
8904 struct md_rdev *rdev, *tmp;
8905 /* kick the device if another node issued a
8908 rdev_for_each_safe(rdev, tmp, mddev) {
8909 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8910 rdev->raid_disk < 0)
8911 md_kick_rdev_from_array(rdev);
8915 if (try_set_sync && !mddev->external && !mddev->in_sync) {
8916 spin_lock(&mddev->lock);
8918 spin_unlock(&mddev->lock);
8921 if (mddev->sb_flags)
8922 md_update_sb(mddev, 0);
8924 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8925 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8926 /* resync/recovery still happening */
8927 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8930 if (mddev->sync_thread) {
8931 md_reap_sync_thread(mddev);
8934 /* Set RUNNING before clearing NEEDED to avoid
8935 * any transients in the value of "sync_action".
8937 mddev->curr_resync_completed = 0;
8938 spin_lock(&mddev->lock);
8939 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8940 spin_unlock(&mddev->lock);
8941 /* Clear some bits that don't mean anything, but
8944 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8945 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8947 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8948 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8950 /* no recovery is running.
8951 * remove any failed drives, then
8952 * add spares if possible.
8953 * Spares are also removed and re-added, to allow
8954 * the personality to fail the re-add.
8957 if (mddev->reshape_position != MaxSector) {
8958 if (mddev->pers->check_reshape == NULL ||
8959 mddev->pers->check_reshape(mddev) != 0)
8960 /* Cannot proceed */
8962 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8963 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8964 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8965 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8966 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8967 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8968 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8969 } else if (mddev->recovery_cp < MaxSector) {
8970 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8971 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8972 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8973 /* nothing to be done ... */
8976 if (mddev->pers->sync_request) {
8978 /* We are adding a device or devices to an array
8979 * which has the bitmap stored on all devices.
8980 * So make sure all bitmap pages get written
8982 md_bitmap_write_all(mddev->bitmap);
8984 INIT_WORK(&mddev->del_work, md_start_sync);
8985 queue_work(md_misc_wq, &mddev->del_work);
8989 if (!mddev->sync_thread) {
8990 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8991 wake_up(&resync_wait);
8992 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8994 if (mddev->sysfs_action)
8995 sysfs_notify_dirent_safe(mddev->sysfs_action);
8998 wake_up(&mddev->sb_wait);
8999 mddev_unlock(mddev);
9002 EXPORT_SYMBOL(md_check_recovery);
9004 void md_reap_sync_thread(struct mddev *mddev)
9006 struct md_rdev *rdev;
9008 /* resync has finished, collect result */
9009 md_unregister_thread(&mddev->sync_thread);
9010 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9011 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9012 mddev->degraded != mddev->raid_disks) {
9014 /* activate any spares */
9015 if (mddev->pers->spare_active(mddev)) {
9016 sysfs_notify(&mddev->kobj, NULL,
9018 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9021 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9022 mddev->pers->finish_reshape)
9023 mddev->pers->finish_reshape(mddev);
9025 /* If array is no-longer degraded, then any saved_raid_disk
9026 * information must be scrapped.
9028 if (!mddev->degraded)
9029 rdev_for_each(rdev, mddev)
9030 rdev->saved_raid_disk = -1;
9032 md_update_sb(mddev, 1);
9033 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9034 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9036 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9037 md_cluster_ops->resync_finish(mddev);
9038 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9039 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9040 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9041 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9042 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9043 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9044 wake_up(&resync_wait);
9045 /* flag recovery needed just to double check */
9046 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9047 sysfs_notify_dirent_safe(mddev->sysfs_action);
9048 md_new_event(mddev);
9049 if (mddev->event_work.func)
9050 queue_work(md_misc_wq, &mddev->event_work);
9052 EXPORT_SYMBOL(md_reap_sync_thread);
9054 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9056 sysfs_notify_dirent_safe(rdev->sysfs_state);
9057 wait_event_timeout(rdev->blocked_wait,
9058 !test_bit(Blocked, &rdev->flags) &&
9059 !test_bit(BlockedBadBlocks, &rdev->flags),
9060 msecs_to_jiffies(5000));
9061 rdev_dec_pending(rdev, mddev);
9063 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9065 void md_finish_reshape(struct mddev *mddev)
9067 /* called be personality module when reshape completes. */
9068 struct md_rdev *rdev;
9070 rdev_for_each(rdev, mddev) {
9071 if (rdev->data_offset > rdev->new_data_offset)
9072 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9074 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9075 rdev->data_offset = rdev->new_data_offset;
9078 EXPORT_SYMBOL(md_finish_reshape);
9080 /* Bad block management */
9082 /* Returns 1 on success, 0 on failure */
9083 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9086 struct mddev *mddev = rdev->mddev;
9089 s += rdev->new_data_offset;
9091 s += rdev->data_offset;
9092 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9094 /* Make sure they get written out promptly */
9095 if (test_bit(ExternalBbl, &rdev->flags))
9096 sysfs_notify(&rdev->kobj, NULL,
9097 "unacknowledged_bad_blocks");
9098 sysfs_notify_dirent_safe(rdev->sysfs_state);
9099 set_mask_bits(&mddev->sb_flags, 0,
9100 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9101 md_wakeup_thread(rdev->mddev->thread);
9106 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9108 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9113 s += rdev->new_data_offset;
9115 s += rdev->data_offset;
9116 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9117 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9118 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9121 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9123 static int md_notify_reboot(struct notifier_block *this,
9124 unsigned long code, void *x)
9126 struct list_head *tmp;
9127 struct mddev *mddev;
9130 for_each_mddev(mddev, tmp) {
9131 if (mddev_trylock(mddev)) {
9133 __md_stop_writes(mddev);
9134 if (mddev->persistent)
9135 mddev->safemode = 2;
9136 mddev_unlock(mddev);
9141 * certain more exotic SCSI devices are known to be
9142 * volatile wrt too early system reboots. While the
9143 * right place to handle this issue is the given
9144 * driver, we do want to have a safe RAID driver ...
9152 static struct notifier_block md_notifier = {
9153 .notifier_call = md_notify_reboot,
9155 .priority = INT_MAX, /* before any real devices */
9158 static void md_geninit(void)
9160 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9162 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9165 static int __init md_init(void)
9169 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9173 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9177 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9180 if ((ret = register_blkdev(0, "mdp")) < 0)
9184 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9185 md_probe, NULL, NULL);
9186 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9187 md_probe, NULL, NULL);
9189 register_reboot_notifier(&md_notifier);
9190 raid_table_header = register_sysctl_table(raid_root_table);
9196 unregister_blkdev(MD_MAJOR, "md");
9198 destroy_workqueue(md_misc_wq);
9200 destroy_workqueue(md_wq);
9205 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9207 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9208 struct md_rdev *rdev2, *tmp;
9210 char b[BDEVNAME_SIZE];
9213 * If size is changed in another node then we need to
9214 * do resize as well.
9216 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9217 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9219 pr_info("md-cluster: resize failed\n");
9221 md_bitmap_update_sb(mddev->bitmap);
9224 /* Check for change of roles in the active devices */
9225 rdev_for_each_safe(rdev2, tmp, mddev) {
9226 if (test_bit(Faulty, &rdev2->flags))
9229 /* Check if the roles changed */
9230 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9232 if (test_bit(Candidate, &rdev2->flags)) {
9233 if (role == 0xfffe) {
9234 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9235 md_kick_rdev_from_array(rdev2);
9239 clear_bit(Candidate, &rdev2->flags);
9242 if (role != rdev2->raid_disk) {
9244 if (rdev2->raid_disk == -1 && role != 0xffff) {
9245 rdev2->saved_raid_disk = role;
9246 ret = remove_and_add_spares(mddev, rdev2);
9247 pr_info("Activated spare: %s\n",
9248 bdevname(rdev2->bdev,b));
9249 /* wakeup mddev->thread here, so array could
9250 * perform resync with the new activated disk */
9251 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9252 md_wakeup_thread(mddev->thread);
9256 * We just want to do the minimum to mark the disk
9257 * as faulty. The recovery is performed by the
9258 * one who initiated the error.
9260 if ((role == 0xfffe) || (role == 0xfffd)) {
9261 md_error(mddev, rdev2);
9262 clear_bit(Blocked, &rdev2->flags);
9267 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9268 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9270 pr_warn("md: updating array disks failed. %d\n", ret);
9273 /* Finally set the event to be up to date */
9274 mddev->events = le64_to_cpu(sb->events);
9277 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9280 struct page *swapout = rdev->sb_page;
9281 struct mdp_superblock_1 *sb;
9283 /* Store the sb page of the rdev in the swapout temporary
9284 * variable in case we err in the future
9286 rdev->sb_page = NULL;
9287 err = alloc_disk_sb(rdev);
9289 ClearPageUptodate(rdev->sb_page);
9290 rdev->sb_loaded = 0;
9291 err = super_types[mddev->major_version].
9292 load_super(rdev, NULL, mddev->minor_version);
9295 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9296 __func__, __LINE__, rdev->desc_nr, err);
9298 put_page(rdev->sb_page);
9299 rdev->sb_page = swapout;
9300 rdev->sb_loaded = 1;
9304 sb = page_address(rdev->sb_page);
9305 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9309 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9310 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9312 /* The other node finished recovery, call spare_active to set
9313 * device In_sync and mddev->degraded
9315 if (rdev->recovery_offset == MaxSector &&
9316 !test_bit(In_sync, &rdev->flags) &&
9317 mddev->pers->spare_active(mddev))
9318 sysfs_notify(&mddev->kobj, NULL, "degraded");
9324 void md_reload_sb(struct mddev *mddev, int nr)
9326 struct md_rdev *rdev;
9330 rdev_for_each_rcu(rdev, mddev) {
9331 if (rdev->desc_nr == nr)
9335 if (!rdev || rdev->desc_nr != nr) {
9336 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9340 err = read_rdev(mddev, rdev);
9344 check_sb_changes(mddev, rdev);
9346 /* Read all rdev's to update recovery_offset */
9347 rdev_for_each_rcu(rdev, mddev) {
9348 if (!test_bit(Faulty, &rdev->flags))
9349 read_rdev(mddev, rdev);
9352 EXPORT_SYMBOL(md_reload_sb);
9357 * Searches all registered partitions for autorun RAID arrays
9361 static DEFINE_MUTEX(detected_devices_mutex);
9362 static LIST_HEAD(all_detected_devices);
9363 struct detected_devices_node {
9364 struct list_head list;
9368 void md_autodetect_dev(dev_t dev)
9370 struct detected_devices_node *node_detected_dev;
9372 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9373 if (node_detected_dev) {
9374 node_detected_dev->dev = dev;
9375 mutex_lock(&detected_devices_mutex);
9376 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9377 mutex_unlock(&detected_devices_mutex);
9381 static void autostart_arrays(int part)
9383 struct md_rdev *rdev;
9384 struct detected_devices_node *node_detected_dev;
9386 int i_scanned, i_passed;
9391 pr_info("md: Autodetecting RAID arrays.\n");
9393 mutex_lock(&detected_devices_mutex);
9394 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9396 node_detected_dev = list_entry(all_detected_devices.next,
9397 struct detected_devices_node, list);
9398 list_del(&node_detected_dev->list);
9399 dev = node_detected_dev->dev;
9400 kfree(node_detected_dev);
9401 mutex_unlock(&detected_devices_mutex);
9402 rdev = md_import_device(dev,0, 90);
9403 mutex_lock(&detected_devices_mutex);
9407 if (test_bit(Faulty, &rdev->flags))
9410 set_bit(AutoDetected, &rdev->flags);
9411 list_add(&rdev->same_set, &pending_raid_disks);
9414 mutex_unlock(&detected_devices_mutex);
9416 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9418 autorun_devices(part);
9421 #endif /* !MODULE */
9423 static __exit void md_exit(void)
9425 struct mddev *mddev;
9426 struct list_head *tmp;
9429 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9430 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9432 unregister_blkdev(MD_MAJOR,"md");
9433 unregister_blkdev(mdp_major, "mdp");
9434 unregister_reboot_notifier(&md_notifier);
9435 unregister_sysctl_table(raid_table_header);
9437 /* We cannot unload the modules while some process is
9438 * waiting for us in select() or poll() - wake them up
9441 while (waitqueue_active(&md_event_waiters)) {
9442 /* not safe to leave yet */
9443 wake_up(&md_event_waiters);
9447 remove_proc_entry("mdstat", NULL);
9449 for_each_mddev(mddev, tmp) {
9450 export_array(mddev);
9452 mddev->hold_active = 0;
9454 * for_each_mddev() will call mddev_put() at the end of each
9455 * iteration. As the mddev is now fully clear, this will
9456 * schedule the mddev for destruction by a workqueue, and the
9457 * destroy_workqueue() below will wait for that to complete.
9460 destroy_workqueue(md_misc_wq);
9461 destroy_workqueue(md_wq);
9464 subsys_initcall(md_init);
9465 module_exit(md_exit)
9467 static int get_ro(char *buffer, const struct kernel_param *kp)
9469 return sprintf(buffer, "%d", start_readonly);
9471 static int set_ro(const char *val, const struct kernel_param *kp)
9473 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9476 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9477 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9478 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9479 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9481 MODULE_LICENSE("GPL");
9482 MODULE_DESCRIPTION("MD RAID framework");
9484 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);