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>
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 struct md_cluster_operations *md_cluster_ops;
88 EXPORT_SYMBOL(md_cluster_ops);
89 struct module *md_cluster_mod;
90 EXPORT_SYMBOL(md_cluster_mod);
92 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
93 static struct workqueue_struct *md_wq;
94 static struct workqueue_struct *md_misc_wq;
96 static int remove_and_add_spares(struct mddev *mddev,
97 struct md_rdev *this);
98 static void mddev_detach(struct mddev *mddev);
101 * Default number of read corrections we'll attempt on an rdev
102 * before ejecting it from the array. We divide the read error
103 * count by 2 for every hour elapsed between read errors.
105 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
107 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
108 * is 1000 KB/sec, so the extra system load does not show up that much.
109 * Increase it if you want to have more _guaranteed_ speed. Note that
110 * the RAID driver will use the maximum available bandwidth if the IO
111 * subsystem is idle. There is also an 'absolute maximum' reconstruction
112 * speed limit - in case reconstruction slows down your system despite
115 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
116 * or /sys/block/mdX/md/sync_speed_{min,max}
119 static int sysctl_speed_limit_min = 1000;
120 static int sysctl_speed_limit_max = 200000;
121 static inline int speed_min(struct mddev *mddev)
123 return mddev->sync_speed_min ?
124 mddev->sync_speed_min : sysctl_speed_limit_min;
127 static inline int speed_max(struct mddev *mddev)
129 return mddev->sync_speed_max ?
130 mddev->sync_speed_max : sysctl_speed_limit_max;
133 static struct ctl_table_header *raid_table_header;
135 static struct ctl_table raid_table[] = {
137 .procname = "speed_limit_min",
138 .data = &sysctl_speed_limit_min,
139 .maxlen = sizeof(int),
140 .mode = S_IRUGO|S_IWUSR,
141 .proc_handler = proc_dointvec,
144 .procname = "speed_limit_max",
145 .data = &sysctl_speed_limit_max,
146 .maxlen = sizeof(int),
147 .mode = S_IRUGO|S_IWUSR,
148 .proc_handler = proc_dointvec,
153 static struct ctl_table raid_dir_table[] = {
157 .mode = S_IRUGO|S_IXUGO,
163 static struct ctl_table raid_root_table[] = {
168 .child = raid_dir_table,
173 static const struct block_device_operations md_fops;
175 static int start_readonly;
178 * The original mechanism for creating an md device is to create
179 * a device node in /dev and to open it. This causes races with device-close.
180 * The preferred method is to write to the "new_array" module parameter.
181 * This can avoid races.
182 * Setting create_on_open to false disables the original mechanism
183 * so all the races disappear.
185 static bool create_on_open = true;
188 * like bio_clone_bioset, but with a local bio set
191 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
196 if (!mddev || !mddev->bio_set)
197 return bio_alloc(gfp_mask, nr_iovecs);
199 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
204 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
206 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
208 if (!mddev || !mddev->sync_set)
209 return bio_alloc(GFP_NOIO, 1);
211 return bio_alloc_bioset(GFP_NOIO, 1, mddev->sync_set);
215 * We have a system wide 'event count' that is incremented
216 * on any 'interesting' event, and readers of /proc/mdstat
217 * can use 'poll' or 'select' to find out when the event
221 * start array, stop array, error, add device, remove device,
222 * start build, activate spare
224 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
225 static atomic_t md_event_count;
226 void md_new_event(struct mddev *mddev)
228 atomic_inc(&md_event_count);
229 wake_up(&md_event_waiters);
231 EXPORT_SYMBOL_GPL(md_new_event);
234 * Enables to iterate over all existing md arrays
235 * all_mddevs_lock protects this list.
237 static LIST_HEAD(all_mddevs);
238 static DEFINE_SPINLOCK(all_mddevs_lock);
241 * iterates through all used mddevs in the system.
242 * We take care to grab the all_mddevs_lock whenever navigating
243 * the list, and to always hold a refcount when unlocked.
244 * Any code which breaks out of this loop while own
245 * a reference to the current mddev and must mddev_put it.
247 #define for_each_mddev(_mddev,_tmp) \
249 for (({ spin_lock(&all_mddevs_lock); \
250 _tmp = all_mddevs.next; \
252 ({ if (_tmp != &all_mddevs) \
253 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
254 spin_unlock(&all_mddevs_lock); \
255 if (_mddev) mddev_put(_mddev); \
256 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
257 _tmp != &all_mddevs;}); \
258 ({ spin_lock(&all_mddevs_lock); \
259 _tmp = _tmp->next;}) \
262 /* Rather than calling directly into the personality make_request function,
263 * IO requests come here first so that we can check if the device is
264 * being suspended pending a reconfiguration.
265 * We hold a refcount over the call to ->make_request. By the time that
266 * call has finished, the bio has been linked into some internal structure
267 * and so is visible to ->quiesce(), so we don't need the refcount any more.
269 static bool is_suspended(struct mddev *mddev, struct bio *bio)
271 if (mddev->suspended)
273 if (bio_data_dir(bio) != WRITE)
275 if (mddev->suspend_lo >= mddev->suspend_hi)
277 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
279 if (bio_end_sector(bio) < mddev->suspend_lo)
284 void md_handle_request(struct mddev *mddev, struct bio *bio)
288 if (is_suspended(mddev, bio)) {
291 prepare_to_wait(&mddev->sb_wait, &__wait,
292 TASK_UNINTERRUPTIBLE);
293 if (!is_suspended(mddev, bio))
299 finish_wait(&mddev->sb_wait, &__wait);
301 atomic_inc(&mddev->active_io);
304 if (!mddev->pers->make_request(mddev, bio)) {
305 atomic_dec(&mddev->active_io);
306 wake_up(&mddev->sb_wait);
307 goto check_suspended;
310 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
311 wake_up(&mddev->sb_wait);
313 EXPORT_SYMBOL(md_handle_request);
315 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
317 const int rw = bio_data_dir(bio);
318 struct mddev *mddev = q->queuedata;
319 unsigned int sectors;
322 blk_queue_split(q, &bio);
324 if (mddev == NULL || mddev->pers == NULL) {
326 return BLK_QC_T_NONE;
328 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
329 if (bio_sectors(bio) != 0)
330 bio->bi_status = BLK_STS_IOERR;
332 return BLK_QC_T_NONE;
336 * save the sectors now since our bio can
337 * go away inside make_request
339 sectors = bio_sectors(bio);
340 /* bio could be mergeable after passing to underlayer */
341 bio->bi_opf &= ~REQ_NOMERGE;
343 md_handle_request(mddev, bio);
345 cpu = part_stat_lock();
346 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
347 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
350 return BLK_QC_T_NONE;
353 /* mddev_suspend makes sure no new requests are submitted
354 * to the device, and that any requests that have been submitted
355 * are completely handled.
356 * Once mddev_detach() is called and completes, the module will be
359 void mddev_suspend(struct mddev *mddev)
361 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
362 lockdep_assert_held(&mddev->reconfig_mutex);
363 if (mddev->suspended++)
366 wake_up(&mddev->sb_wait);
367 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
368 smp_mb__after_atomic();
369 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
370 mddev->pers->quiesce(mddev, 1);
371 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
372 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
374 del_timer_sync(&mddev->safemode_timer);
376 EXPORT_SYMBOL_GPL(mddev_suspend);
378 void mddev_resume(struct mddev *mddev)
380 lockdep_assert_held(&mddev->reconfig_mutex);
381 if (--mddev->suspended)
383 wake_up(&mddev->sb_wait);
384 mddev->pers->quiesce(mddev, 0);
386 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
387 md_wakeup_thread(mddev->thread);
388 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
390 EXPORT_SYMBOL_GPL(mddev_resume);
392 int mddev_congested(struct mddev *mddev, int bits)
394 struct md_personality *pers = mddev->pers;
398 if (mddev->suspended)
400 else if (pers && pers->congested)
401 ret = pers->congested(mddev, bits);
405 EXPORT_SYMBOL_GPL(mddev_congested);
406 static int md_congested(void *data, int bits)
408 struct mddev *mddev = data;
409 return mddev_congested(mddev, bits);
413 * Generic flush handling for md
416 static void md_end_flush(struct bio *bio)
418 struct md_rdev *rdev = bio->bi_private;
419 struct mddev *mddev = rdev->mddev;
421 rdev_dec_pending(rdev, mddev);
423 if (atomic_dec_and_test(&mddev->flush_pending)) {
424 /* The pre-request flush has finished */
425 queue_work(md_wq, &mddev->flush_work);
430 static void md_submit_flush_data(struct work_struct *ws);
432 static void submit_flushes(struct work_struct *ws)
434 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
435 struct md_rdev *rdev;
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 mddev->flush_bio = NULL;
478 wake_up(&mddev->sb_wait);
480 if (bio->bi_iter.bi_size == 0)
481 /* an empty barrier - all done */
484 bio->bi_opf &= ~REQ_PREFLUSH;
485 md_handle_request(mddev, bio);
489 void md_flush_request(struct mddev *mddev, struct bio *bio)
491 spin_lock_irq(&mddev->lock);
492 wait_event_lock_irq(mddev->sb_wait,
495 mddev->flush_bio = bio;
496 spin_unlock_irq(&mddev->lock);
498 INIT_WORK(&mddev->flush_work, submit_flushes);
499 queue_work(md_wq, &mddev->flush_work);
501 EXPORT_SYMBOL(md_flush_request);
503 static inline struct mddev *mddev_get(struct mddev *mddev)
505 atomic_inc(&mddev->active);
509 static void mddev_delayed_delete(struct work_struct *ws);
511 static void mddev_put(struct mddev *mddev)
513 struct bio_set *bs = NULL, *sync_bs = NULL;
515 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
517 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
518 mddev->ctime == 0 && !mddev->hold_active) {
519 /* Array is not configured at all, and not held active,
521 list_del_init(&mddev->all_mddevs);
523 sync_bs = mddev->sync_set;
524 mddev->bio_set = NULL;
525 mddev->sync_set = NULL;
526 if (mddev->gendisk) {
527 /* We did a probe so need to clean up. Call
528 * queue_work inside the spinlock so that
529 * flush_workqueue() after mddev_find will
530 * succeed in waiting for the work to be done.
532 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
533 queue_work(md_misc_wq, &mddev->del_work);
537 spin_unlock(&all_mddevs_lock);
541 bioset_free(sync_bs);
544 static void md_safemode_timeout(unsigned long data);
546 void mddev_init(struct mddev *mddev)
548 mutex_init(&mddev->open_mutex);
549 mutex_init(&mddev->reconfig_mutex);
550 mutex_init(&mddev->bitmap_info.mutex);
551 INIT_LIST_HEAD(&mddev->disks);
552 INIT_LIST_HEAD(&mddev->all_mddevs);
553 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
554 (unsigned long) mddev);
555 atomic_set(&mddev->active, 1);
556 atomic_set(&mddev->openers, 0);
557 atomic_set(&mddev->active_io, 0);
558 spin_lock_init(&mddev->lock);
559 atomic_set(&mddev->flush_pending, 0);
560 init_waitqueue_head(&mddev->sb_wait);
561 init_waitqueue_head(&mddev->recovery_wait);
562 mddev->reshape_position = MaxSector;
563 mddev->reshape_backwards = 0;
564 mddev->last_sync_action = "none";
565 mddev->resync_min = 0;
566 mddev->resync_max = MaxSector;
567 mddev->level = LEVEL_NONE;
569 EXPORT_SYMBOL_GPL(mddev_init);
571 static struct mddev *mddev_find_locked(dev_t unit)
575 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
576 if (mddev->unit == unit)
582 static struct mddev *mddev_find(dev_t unit)
586 if (MAJOR(unit) != MD_MAJOR)
587 unit &= ~((1 << MdpMinorShift) - 1);
589 spin_lock(&all_mddevs_lock);
590 mddev = mddev_find_locked(unit);
593 spin_unlock(&all_mddevs_lock);
598 static struct mddev *mddev_find_or_alloc(dev_t unit)
600 struct mddev *mddev, *new = NULL;
602 if (unit && MAJOR(unit) != MD_MAJOR)
603 unit &= ~((1<<MdpMinorShift)-1);
606 spin_lock(&all_mddevs_lock);
609 mddev = mddev_find_locked(unit);
612 spin_unlock(&all_mddevs_lock);
618 list_add(&new->all_mddevs, &all_mddevs);
619 spin_unlock(&all_mddevs_lock);
620 new->hold_active = UNTIL_IOCTL;
624 /* find an unused unit number */
625 static int next_minor = 512;
626 int start = next_minor;
630 dev = MKDEV(MD_MAJOR, next_minor);
632 if (next_minor > MINORMASK)
634 if (next_minor == start) {
635 /* Oh dear, all in use. */
636 spin_unlock(&all_mddevs_lock);
641 is_free = !mddev_find_locked(dev);
644 new->md_minor = MINOR(dev);
645 new->hold_active = UNTIL_STOP;
646 list_add(&new->all_mddevs, &all_mddevs);
647 spin_unlock(&all_mddevs_lock);
650 spin_unlock(&all_mddevs_lock);
652 new = kzalloc(sizeof(*new), GFP_KERNEL);
657 if (MAJOR(unit) == MD_MAJOR)
658 new->md_minor = MINOR(unit);
660 new->md_minor = MINOR(unit) >> MdpMinorShift;
667 static struct attribute_group md_redundancy_group;
669 void mddev_unlock(struct mddev *mddev)
671 if (mddev->to_remove) {
672 /* These cannot be removed under reconfig_mutex as
673 * an access to the files will try to take reconfig_mutex
674 * while holding the file unremovable, which leads to
676 * So hold set sysfs_active while the remove in happeing,
677 * and anything else which might set ->to_remove or my
678 * otherwise change the sysfs namespace will fail with
679 * -EBUSY if sysfs_active is still set.
680 * We set sysfs_active under reconfig_mutex and elsewhere
681 * test it under the same mutex to ensure its correct value
684 struct attribute_group *to_remove = mddev->to_remove;
685 mddev->to_remove = NULL;
686 mddev->sysfs_active = 1;
687 mutex_unlock(&mddev->reconfig_mutex);
689 if (mddev->kobj.sd) {
690 if (to_remove != &md_redundancy_group)
691 sysfs_remove_group(&mddev->kobj, to_remove);
692 if (mddev->pers == NULL ||
693 mddev->pers->sync_request == NULL) {
694 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
695 if (mddev->sysfs_action)
696 sysfs_put(mddev->sysfs_action);
697 mddev->sysfs_action = NULL;
700 mddev->sysfs_active = 0;
702 mutex_unlock(&mddev->reconfig_mutex);
704 /* As we've dropped the mutex we need a spinlock to
705 * make sure the thread doesn't disappear
707 spin_lock(&pers_lock);
708 md_wakeup_thread(mddev->thread);
709 wake_up(&mddev->sb_wait);
710 spin_unlock(&pers_lock);
712 EXPORT_SYMBOL_GPL(mddev_unlock);
714 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
716 struct md_rdev *rdev;
718 rdev_for_each_rcu(rdev, mddev)
719 if (rdev->desc_nr == nr)
724 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
726 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
728 struct md_rdev *rdev;
730 rdev_for_each(rdev, mddev)
731 if (rdev->bdev->bd_dev == dev)
737 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
739 struct md_rdev *rdev;
741 rdev_for_each_rcu(rdev, mddev)
742 if (rdev->bdev->bd_dev == dev)
748 static struct md_personality *find_pers(int level, char *clevel)
750 struct md_personality *pers;
751 list_for_each_entry(pers, &pers_list, list) {
752 if (level != LEVEL_NONE && pers->level == level)
754 if (strcmp(pers->name, clevel)==0)
760 /* return the offset of the super block in 512byte sectors */
761 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
763 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
764 return MD_NEW_SIZE_SECTORS(num_sectors);
767 static int alloc_disk_sb(struct md_rdev *rdev)
769 rdev->sb_page = alloc_page(GFP_KERNEL);
775 void md_rdev_clear(struct md_rdev *rdev)
778 put_page(rdev->sb_page);
780 rdev->sb_page = NULL;
785 put_page(rdev->bb_page);
786 rdev->bb_page = NULL;
788 badblocks_exit(&rdev->badblocks);
790 EXPORT_SYMBOL_GPL(md_rdev_clear);
792 static void super_written(struct bio *bio)
794 struct md_rdev *rdev = bio->bi_private;
795 struct mddev *mddev = rdev->mddev;
797 if (bio->bi_status) {
798 pr_err("md: super_written gets error=%d\n", bio->bi_status);
799 md_error(mddev, rdev);
800 if (!test_bit(Faulty, &rdev->flags)
801 && (bio->bi_opf & MD_FAILFAST)) {
802 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
803 set_bit(LastDev, &rdev->flags);
806 clear_bit(LastDev, &rdev->flags);
808 if (atomic_dec_and_test(&mddev->pending_writes))
809 wake_up(&mddev->sb_wait);
810 rdev_dec_pending(rdev, mddev);
814 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
815 sector_t sector, int size, struct page *page)
817 /* write first size bytes of page to sector of rdev
818 * Increment mddev->pending_writes before returning
819 * and decrement it on completion, waking up sb_wait
820 * if zero is reached.
821 * If an error occurred, call md_error
829 if (test_bit(Faulty, &rdev->flags))
832 bio = md_bio_alloc_sync(mddev);
834 atomic_inc(&rdev->nr_pending);
836 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
837 bio->bi_iter.bi_sector = sector;
838 bio_add_page(bio, page, size, 0);
839 bio->bi_private = rdev;
840 bio->bi_end_io = super_written;
842 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
843 test_bit(FailFast, &rdev->flags) &&
844 !test_bit(LastDev, &rdev->flags))
846 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
848 atomic_inc(&mddev->pending_writes);
852 int md_super_wait(struct mddev *mddev)
854 /* wait for all superblock writes that were scheduled to complete */
855 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
856 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
861 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
862 struct page *page, int op, int op_flags, bool metadata_op)
864 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
867 if (metadata_op && rdev->meta_bdev)
868 bio_set_dev(bio, rdev->meta_bdev);
870 bio_set_dev(bio, rdev->bdev);
871 bio_set_op_attrs(bio, op, op_flags);
873 bio->bi_iter.bi_sector = sector + rdev->sb_start;
874 else if (rdev->mddev->reshape_position != MaxSector &&
875 (rdev->mddev->reshape_backwards ==
876 (sector >= rdev->mddev->reshape_position)))
877 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
879 bio->bi_iter.bi_sector = sector + rdev->data_offset;
880 bio_add_page(bio, page, size, 0);
882 submit_bio_wait(bio);
884 ret = !bio->bi_status;
888 EXPORT_SYMBOL_GPL(sync_page_io);
890 static int read_disk_sb(struct md_rdev *rdev, int size)
892 char b[BDEVNAME_SIZE];
897 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
903 pr_err("md: disabled device %s, could not read superblock.\n",
904 bdevname(rdev->bdev,b));
908 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
910 return sb1->set_uuid0 == sb2->set_uuid0 &&
911 sb1->set_uuid1 == sb2->set_uuid1 &&
912 sb1->set_uuid2 == sb2->set_uuid2 &&
913 sb1->set_uuid3 == sb2->set_uuid3;
916 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
919 mdp_super_t *tmp1, *tmp2;
921 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
922 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
924 if (!tmp1 || !tmp2) {
933 * nr_disks is not constant
938 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
945 static u32 md_csum_fold(u32 csum)
947 csum = (csum & 0xffff) + (csum >> 16);
948 return (csum & 0xffff) + (csum >> 16);
951 static unsigned int calc_sb_csum(mdp_super_t *sb)
954 u32 *sb32 = (u32*)sb;
956 unsigned int disk_csum, csum;
958 disk_csum = sb->sb_csum;
961 for (i = 0; i < MD_SB_BYTES/4 ; i++)
963 csum = (newcsum & 0xffffffff) + (newcsum>>32);
966 /* This used to use csum_partial, which was wrong for several
967 * reasons including that different results are returned on
968 * different architectures. It isn't critical that we get exactly
969 * the same return value as before (we always csum_fold before
970 * testing, and that removes any differences). However as we
971 * know that csum_partial always returned a 16bit value on
972 * alphas, do a fold to maximise conformity to previous behaviour.
974 sb->sb_csum = md_csum_fold(disk_csum);
976 sb->sb_csum = disk_csum;
982 * Handle superblock details.
983 * We want to be able to handle multiple superblock formats
984 * so we have a common interface to them all, and an array of
985 * different handlers.
986 * We rely on user-space to write the initial superblock, and support
987 * reading and updating of superblocks.
988 * Interface methods are:
989 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
990 * loads and validates a superblock on dev.
991 * if refdev != NULL, compare superblocks on both devices
993 * 0 - dev has a superblock that is compatible with refdev
994 * 1 - dev has a superblock that is compatible and newer than refdev
995 * so dev should be used as the refdev in future
996 * -EINVAL superblock incompatible or invalid
997 * -othererror e.g. -EIO
999 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1000 * Verify that dev is acceptable into mddev.
1001 * The first time, mddev->raid_disks will be 0, and data from
1002 * dev should be merged in. Subsequent calls check that dev
1003 * is new enough. Return 0 or -EINVAL
1005 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1006 * Update the superblock for rdev with data in mddev
1007 * This does not write to disc.
1013 struct module *owner;
1014 int (*load_super)(struct md_rdev *rdev,
1015 struct md_rdev *refdev,
1017 int (*validate_super)(struct mddev *mddev,
1018 struct md_rdev *rdev);
1019 void (*sync_super)(struct mddev *mddev,
1020 struct md_rdev *rdev);
1021 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1022 sector_t num_sectors);
1023 int (*allow_new_offset)(struct md_rdev *rdev,
1024 unsigned long long new_offset);
1028 * Check that the given mddev has no bitmap.
1030 * This function is called from the run method of all personalities that do not
1031 * support bitmaps. It prints an error message and returns non-zero if mddev
1032 * has a bitmap. Otherwise, it returns 0.
1035 int md_check_no_bitmap(struct mddev *mddev)
1037 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1039 pr_warn("%s: bitmaps are not supported for %s\n",
1040 mdname(mddev), mddev->pers->name);
1043 EXPORT_SYMBOL(md_check_no_bitmap);
1046 * load_super for 0.90.0
1048 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1050 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1055 * Calculate the position of the superblock (512byte sectors),
1056 * it's at the end of the disk.
1058 * It also happens to be a multiple of 4Kb.
1060 rdev->sb_start = calc_dev_sboffset(rdev);
1062 ret = read_disk_sb(rdev, MD_SB_BYTES);
1068 bdevname(rdev->bdev, b);
1069 sb = page_address(rdev->sb_page);
1071 if (sb->md_magic != MD_SB_MAGIC) {
1072 pr_warn("md: invalid raid superblock magic on %s\n", b);
1076 if (sb->major_version != 0 ||
1077 sb->minor_version < 90 ||
1078 sb->minor_version > 91) {
1079 pr_warn("Bad version number %d.%d on %s\n",
1080 sb->major_version, sb->minor_version, b);
1084 if (sb->raid_disks <= 0)
1087 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1088 pr_warn("md: invalid superblock checksum on %s\n", b);
1092 rdev->preferred_minor = sb->md_minor;
1093 rdev->data_offset = 0;
1094 rdev->new_data_offset = 0;
1095 rdev->sb_size = MD_SB_BYTES;
1096 rdev->badblocks.shift = -1;
1098 if (sb->level == LEVEL_MULTIPATH)
1101 rdev->desc_nr = sb->this_disk.number;
1107 mdp_super_t *refsb = page_address(refdev->sb_page);
1108 if (!md_uuid_equal(refsb, sb)) {
1109 pr_warn("md: %s has different UUID to %s\n",
1110 b, bdevname(refdev->bdev,b2));
1113 if (!md_sb_equal(refsb, sb)) {
1114 pr_warn("md: %s has same UUID but different superblock to %s\n",
1115 b, bdevname(refdev->bdev, b2));
1119 ev2 = md_event(refsb);
1125 rdev->sectors = rdev->sb_start;
1126 /* Limit to 4TB as metadata cannot record more than that.
1127 * (not needed for Linear and RAID0 as metadata doesn't
1130 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1132 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1134 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1135 /* "this cannot possibly happen" ... */
1143 * validate_super for 0.90.0
1145 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1148 mdp_super_t *sb = page_address(rdev->sb_page);
1149 __u64 ev1 = md_event(sb);
1151 rdev->raid_disk = -1;
1152 clear_bit(Faulty, &rdev->flags);
1153 clear_bit(In_sync, &rdev->flags);
1154 clear_bit(Bitmap_sync, &rdev->flags);
1155 clear_bit(WriteMostly, &rdev->flags);
1157 if (mddev->raid_disks == 0) {
1158 mddev->major_version = 0;
1159 mddev->minor_version = sb->minor_version;
1160 mddev->patch_version = sb->patch_version;
1161 mddev->external = 0;
1162 mddev->chunk_sectors = sb->chunk_size >> 9;
1163 mddev->ctime = sb->ctime;
1164 mddev->utime = sb->utime;
1165 mddev->level = sb->level;
1166 mddev->clevel[0] = 0;
1167 mddev->layout = sb->layout;
1168 mddev->raid_disks = sb->raid_disks;
1169 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1170 mddev->events = ev1;
1171 mddev->bitmap_info.offset = 0;
1172 mddev->bitmap_info.space = 0;
1173 /* bitmap can use 60 K after the 4K superblocks */
1174 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1175 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1176 mddev->reshape_backwards = 0;
1178 if (mddev->minor_version >= 91) {
1179 mddev->reshape_position = sb->reshape_position;
1180 mddev->delta_disks = sb->delta_disks;
1181 mddev->new_level = sb->new_level;
1182 mddev->new_layout = sb->new_layout;
1183 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1184 if (mddev->delta_disks < 0)
1185 mddev->reshape_backwards = 1;
1187 mddev->reshape_position = MaxSector;
1188 mddev->delta_disks = 0;
1189 mddev->new_level = mddev->level;
1190 mddev->new_layout = mddev->layout;
1191 mddev->new_chunk_sectors = mddev->chunk_sectors;
1193 if (mddev->level == 0)
1196 if (sb->state & (1<<MD_SB_CLEAN))
1197 mddev->recovery_cp = MaxSector;
1199 if (sb->events_hi == sb->cp_events_hi &&
1200 sb->events_lo == sb->cp_events_lo) {
1201 mddev->recovery_cp = sb->recovery_cp;
1203 mddev->recovery_cp = 0;
1206 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1207 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1208 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1209 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1211 mddev->max_disks = MD_SB_DISKS;
1213 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1214 mddev->bitmap_info.file == NULL) {
1215 mddev->bitmap_info.offset =
1216 mddev->bitmap_info.default_offset;
1217 mddev->bitmap_info.space =
1218 mddev->bitmap_info.default_space;
1221 } else if (mddev->pers == NULL) {
1222 /* Insist on good event counter while assembling, except
1223 * for spares (which don't need an event count) */
1225 if (sb->disks[rdev->desc_nr].state & (
1226 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1227 if (ev1 < mddev->events)
1229 } else if (mddev->bitmap) {
1230 /* if adding to array with a bitmap, then we can accept an
1231 * older device ... but not too old.
1233 if (ev1 < mddev->bitmap->events_cleared)
1235 if (ev1 < mddev->events)
1236 set_bit(Bitmap_sync, &rdev->flags);
1238 if (ev1 < mddev->events)
1239 /* just a hot-add of a new device, leave raid_disk at -1 */
1243 if (mddev->level != LEVEL_MULTIPATH) {
1244 desc = sb->disks + rdev->desc_nr;
1246 if (desc->state & (1<<MD_DISK_FAULTY))
1247 set_bit(Faulty, &rdev->flags);
1248 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1249 desc->raid_disk < mddev->raid_disks */) {
1250 set_bit(In_sync, &rdev->flags);
1251 rdev->raid_disk = desc->raid_disk;
1252 rdev->saved_raid_disk = desc->raid_disk;
1253 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1254 /* active but not in sync implies recovery up to
1255 * reshape position. We don't know exactly where
1256 * that is, so set to zero for now */
1257 if (mddev->minor_version >= 91) {
1258 rdev->recovery_offset = 0;
1259 rdev->raid_disk = desc->raid_disk;
1262 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1263 set_bit(WriteMostly, &rdev->flags);
1264 if (desc->state & (1<<MD_DISK_FAILFAST))
1265 set_bit(FailFast, &rdev->flags);
1266 } else /* MULTIPATH are always insync */
1267 set_bit(In_sync, &rdev->flags);
1272 * sync_super for 0.90.0
1274 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1277 struct md_rdev *rdev2;
1278 int next_spare = mddev->raid_disks;
1280 /* make rdev->sb match mddev data..
1283 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1284 * 3/ any empty disks < next_spare become removed
1286 * disks[0] gets initialised to REMOVED because
1287 * we cannot be sure from other fields if it has
1288 * been initialised or not.
1291 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1293 rdev->sb_size = MD_SB_BYTES;
1295 sb = page_address(rdev->sb_page);
1297 memset(sb, 0, sizeof(*sb));
1299 sb->md_magic = MD_SB_MAGIC;
1300 sb->major_version = mddev->major_version;
1301 sb->patch_version = mddev->patch_version;
1302 sb->gvalid_words = 0; /* ignored */
1303 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1304 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1305 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1306 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1308 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1309 sb->level = mddev->level;
1310 sb->size = mddev->dev_sectors / 2;
1311 sb->raid_disks = mddev->raid_disks;
1312 sb->md_minor = mddev->md_minor;
1313 sb->not_persistent = 0;
1314 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1316 sb->events_hi = (mddev->events>>32);
1317 sb->events_lo = (u32)mddev->events;
1319 if (mddev->reshape_position == MaxSector)
1320 sb->minor_version = 90;
1322 sb->minor_version = 91;
1323 sb->reshape_position = mddev->reshape_position;
1324 sb->new_level = mddev->new_level;
1325 sb->delta_disks = mddev->delta_disks;
1326 sb->new_layout = mddev->new_layout;
1327 sb->new_chunk = mddev->new_chunk_sectors << 9;
1329 mddev->minor_version = sb->minor_version;
1332 sb->recovery_cp = mddev->recovery_cp;
1333 sb->cp_events_hi = (mddev->events>>32);
1334 sb->cp_events_lo = (u32)mddev->events;
1335 if (mddev->recovery_cp == MaxSector)
1336 sb->state = (1<< MD_SB_CLEAN);
1338 sb->recovery_cp = 0;
1340 sb->layout = mddev->layout;
1341 sb->chunk_size = mddev->chunk_sectors << 9;
1343 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1344 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1346 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1347 rdev_for_each(rdev2, mddev) {
1350 int is_active = test_bit(In_sync, &rdev2->flags);
1352 if (rdev2->raid_disk >= 0 &&
1353 sb->minor_version >= 91)
1354 /* we have nowhere to store the recovery_offset,
1355 * but if it is not below the reshape_position,
1356 * we can piggy-back on that.
1359 if (rdev2->raid_disk < 0 ||
1360 test_bit(Faulty, &rdev2->flags))
1363 desc_nr = rdev2->raid_disk;
1365 desc_nr = next_spare++;
1366 rdev2->desc_nr = desc_nr;
1367 d = &sb->disks[rdev2->desc_nr];
1369 d->number = rdev2->desc_nr;
1370 d->major = MAJOR(rdev2->bdev->bd_dev);
1371 d->minor = MINOR(rdev2->bdev->bd_dev);
1373 d->raid_disk = rdev2->raid_disk;
1375 d->raid_disk = rdev2->desc_nr; /* compatibility */
1376 if (test_bit(Faulty, &rdev2->flags))
1377 d->state = (1<<MD_DISK_FAULTY);
1378 else if (is_active) {
1379 d->state = (1<<MD_DISK_ACTIVE);
1380 if (test_bit(In_sync, &rdev2->flags))
1381 d->state |= (1<<MD_DISK_SYNC);
1389 if (test_bit(WriteMostly, &rdev2->flags))
1390 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1391 if (test_bit(FailFast, &rdev2->flags))
1392 d->state |= (1<<MD_DISK_FAILFAST);
1394 /* now set the "removed" and "faulty" bits on any missing devices */
1395 for (i=0 ; i < mddev->raid_disks ; i++) {
1396 mdp_disk_t *d = &sb->disks[i];
1397 if (d->state == 0 && d->number == 0) {
1400 d->state = (1<<MD_DISK_REMOVED);
1401 d->state |= (1<<MD_DISK_FAULTY);
1405 sb->nr_disks = nr_disks;
1406 sb->active_disks = active;
1407 sb->working_disks = working;
1408 sb->failed_disks = failed;
1409 sb->spare_disks = spare;
1411 sb->this_disk = sb->disks[rdev->desc_nr];
1412 sb->sb_csum = calc_sb_csum(sb);
1416 * rdev_size_change for 0.90.0
1418 static unsigned long long
1419 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1421 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1422 return 0; /* component must fit device */
1423 if (rdev->mddev->bitmap_info.offset)
1424 return 0; /* can't move bitmap */
1425 rdev->sb_start = calc_dev_sboffset(rdev);
1426 if (!num_sectors || num_sectors > rdev->sb_start)
1427 num_sectors = rdev->sb_start;
1428 /* Limit to 4TB as metadata cannot record more than that.
1429 * 4TB == 2^32 KB, or 2*2^32 sectors.
1431 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1432 rdev->mddev->level >= 1)
1433 num_sectors = (sector_t)(2ULL << 32) - 2;
1435 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1437 } while (md_super_wait(rdev->mddev) < 0);
1442 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1444 /* non-zero offset changes not possible with v0.90 */
1445 return new_offset == 0;
1449 * version 1 superblock
1452 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1456 unsigned long long newcsum;
1457 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1458 __le32 *isuper = (__le32*)sb;
1460 disk_csum = sb->sb_csum;
1463 for (; size >= 4; size -= 4)
1464 newcsum += le32_to_cpu(*isuper++);
1467 newcsum += le16_to_cpu(*(__le16*) isuper);
1469 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1470 sb->sb_csum = disk_csum;
1471 return cpu_to_le32(csum);
1474 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1476 struct mdp_superblock_1 *sb;
1480 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1484 * Calculate the position of the superblock in 512byte sectors.
1485 * It is always aligned to a 4K boundary and
1486 * depeding on minor_version, it can be:
1487 * 0: At least 8K, but less than 12K, from end of device
1488 * 1: At start of device
1489 * 2: 4K from start of device.
1491 switch(minor_version) {
1493 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1495 sb_start &= ~(sector_t)(4*2-1);
1506 rdev->sb_start = sb_start;
1508 /* superblock is rarely larger than 1K, but it can be larger,
1509 * and it is safe to read 4k, so we do that
1511 ret = read_disk_sb(rdev, 4096);
1512 if (ret) return ret;
1514 sb = page_address(rdev->sb_page);
1516 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1517 sb->major_version != cpu_to_le32(1) ||
1518 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1519 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1520 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1523 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1524 pr_warn("md: invalid superblock checksum on %s\n",
1525 bdevname(rdev->bdev,b));
1528 if (le64_to_cpu(sb->data_size) < 10) {
1529 pr_warn("md: data_size too small on %s\n",
1530 bdevname(rdev->bdev,b));
1535 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1536 /* Some padding is non-zero, might be a new feature */
1539 rdev->preferred_minor = 0xffff;
1540 rdev->data_offset = le64_to_cpu(sb->data_offset);
1541 rdev->new_data_offset = rdev->data_offset;
1542 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1543 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1544 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1545 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1547 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1548 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1549 if (rdev->sb_size & bmask)
1550 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1553 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1556 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1559 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1562 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1564 if (!rdev->bb_page) {
1565 rdev->bb_page = alloc_page(GFP_KERNEL);
1569 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1570 rdev->badblocks.count == 0) {
1571 /* need to load the bad block list.
1572 * Currently we limit it to one page.
1578 int sectors = le16_to_cpu(sb->bblog_size);
1579 if (sectors > (PAGE_SIZE / 512))
1581 offset = le32_to_cpu(sb->bblog_offset);
1584 bb_sector = (long long)offset;
1585 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1586 rdev->bb_page, REQ_OP_READ, 0, true))
1588 bbp = (u64 *)page_address(rdev->bb_page);
1589 rdev->badblocks.shift = sb->bblog_shift;
1590 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1591 u64 bb = le64_to_cpu(*bbp);
1592 int count = bb & (0x3ff);
1593 u64 sector = bb >> 10;
1594 sector <<= sb->bblog_shift;
1595 count <<= sb->bblog_shift;
1598 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1601 } else if (sb->bblog_offset != 0)
1602 rdev->badblocks.shift = 0;
1604 if ((le32_to_cpu(sb->feature_map) &
1605 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1606 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1607 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1608 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1611 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1619 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1621 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1622 sb->level != refsb->level ||
1623 sb->layout != refsb->layout ||
1624 sb->chunksize != refsb->chunksize) {
1625 pr_warn("md: %s has strangely different superblock to %s\n",
1626 bdevname(rdev->bdev,b),
1627 bdevname(refdev->bdev,b2));
1630 ev1 = le64_to_cpu(sb->events);
1631 ev2 = le64_to_cpu(refsb->events);
1638 if (minor_version) {
1639 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1640 sectors -= rdev->data_offset;
1642 sectors = rdev->sb_start;
1643 if (sectors < le64_to_cpu(sb->data_size))
1645 rdev->sectors = le64_to_cpu(sb->data_size);
1649 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1651 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1652 __u64 ev1 = le64_to_cpu(sb->events);
1654 rdev->raid_disk = -1;
1655 clear_bit(Faulty, &rdev->flags);
1656 clear_bit(In_sync, &rdev->flags);
1657 clear_bit(Bitmap_sync, &rdev->flags);
1658 clear_bit(WriteMostly, &rdev->flags);
1660 if (mddev->raid_disks == 0) {
1661 mddev->major_version = 1;
1662 mddev->patch_version = 0;
1663 mddev->external = 0;
1664 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1665 mddev->ctime = le64_to_cpu(sb->ctime);
1666 mddev->utime = le64_to_cpu(sb->utime);
1667 mddev->level = le32_to_cpu(sb->level);
1668 mddev->clevel[0] = 0;
1669 mddev->layout = le32_to_cpu(sb->layout);
1670 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1671 mddev->dev_sectors = le64_to_cpu(sb->size);
1672 mddev->events = ev1;
1673 mddev->bitmap_info.offset = 0;
1674 mddev->bitmap_info.space = 0;
1675 /* Default location for bitmap is 1K after superblock
1676 * using 3K - total of 4K
1678 mddev->bitmap_info.default_offset = 1024 >> 9;
1679 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1680 mddev->reshape_backwards = 0;
1682 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1683 memcpy(mddev->uuid, sb->set_uuid, 16);
1685 mddev->max_disks = (4096-256)/2;
1687 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1688 mddev->bitmap_info.file == NULL) {
1689 mddev->bitmap_info.offset =
1690 (__s32)le32_to_cpu(sb->bitmap_offset);
1691 /* Metadata doesn't record how much space is available.
1692 * For 1.0, we assume we can use up to the superblock
1693 * if before, else to 4K beyond superblock.
1694 * For others, assume no change is possible.
1696 if (mddev->minor_version > 0)
1697 mddev->bitmap_info.space = 0;
1698 else if (mddev->bitmap_info.offset > 0)
1699 mddev->bitmap_info.space =
1700 8 - mddev->bitmap_info.offset;
1702 mddev->bitmap_info.space =
1703 -mddev->bitmap_info.offset;
1706 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1707 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1708 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1709 mddev->new_level = le32_to_cpu(sb->new_level);
1710 mddev->new_layout = le32_to_cpu(sb->new_layout);
1711 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1712 if (mddev->delta_disks < 0 ||
1713 (mddev->delta_disks == 0 &&
1714 (le32_to_cpu(sb->feature_map)
1715 & MD_FEATURE_RESHAPE_BACKWARDS)))
1716 mddev->reshape_backwards = 1;
1718 mddev->reshape_position = MaxSector;
1719 mddev->delta_disks = 0;
1720 mddev->new_level = mddev->level;
1721 mddev->new_layout = mddev->layout;
1722 mddev->new_chunk_sectors = mddev->chunk_sectors;
1725 if (mddev->level == 0 &&
1726 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1729 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1730 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1732 if (le32_to_cpu(sb->feature_map) &
1733 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1734 if (le32_to_cpu(sb->feature_map) &
1735 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1737 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1738 (le32_to_cpu(sb->feature_map) &
1739 MD_FEATURE_MULTIPLE_PPLS))
1741 set_bit(MD_HAS_PPL, &mddev->flags);
1743 } else if (mddev->pers == NULL) {
1744 /* Insist of good event counter while assembling, except for
1745 * spares (which don't need an event count) */
1747 if (rdev->desc_nr >= 0 &&
1748 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1749 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1750 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1751 if (ev1 < mddev->events)
1753 } else if (mddev->bitmap) {
1754 /* If adding to array with a bitmap, then we can accept an
1755 * older device, but not too old.
1757 if (ev1 < mddev->bitmap->events_cleared)
1759 if (ev1 < mddev->events)
1760 set_bit(Bitmap_sync, &rdev->flags);
1762 if (ev1 < mddev->events)
1763 /* just a hot-add of a new device, leave raid_disk at -1 */
1766 if (mddev->level != LEVEL_MULTIPATH) {
1768 if (rdev->desc_nr < 0 ||
1769 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1770 role = MD_DISK_ROLE_SPARE;
1773 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1775 case MD_DISK_ROLE_SPARE: /* spare */
1777 case MD_DISK_ROLE_FAULTY: /* faulty */
1778 set_bit(Faulty, &rdev->flags);
1780 case MD_DISK_ROLE_JOURNAL: /* journal device */
1781 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1782 /* journal device without journal feature */
1783 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1786 set_bit(Journal, &rdev->flags);
1787 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1788 rdev->raid_disk = 0;
1791 rdev->saved_raid_disk = role;
1792 if ((le32_to_cpu(sb->feature_map) &
1793 MD_FEATURE_RECOVERY_OFFSET)) {
1794 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1795 if (!(le32_to_cpu(sb->feature_map) &
1796 MD_FEATURE_RECOVERY_BITMAP))
1797 rdev->saved_raid_disk = -1;
1800 * If the array is FROZEN, then the device can't
1801 * be in_sync with rest of array.
1803 if (!test_bit(MD_RECOVERY_FROZEN,
1805 set_bit(In_sync, &rdev->flags);
1807 rdev->raid_disk = role;
1810 if (sb->devflags & WriteMostly1)
1811 set_bit(WriteMostly, &rdev->flags);
1812 if (sb->devflags & FailFast1)
1813 set_bit(FailFast, &rdev->flags);
1814 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1815 set_bit(Replacement, &rdev->flags);
1816 } else /* MULTIPATH are always insync */
1817 set_bit(In_sync, &rdev->flags);
1822 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1824 struct mdp_superblock_1 *sb;
1825 struct md_rdev *rdev2;
1827 /* make rdev->sb match mddev and rdev data. */
1829 sb = page_address(rdev->sb_page);
1831 sb->feature_map = 0;
1833 sb->recovery_offset = cpu_to_le64(0);
1834 memset(sb->pad3, 0, sizeof(sb->pad3));
1836 sb->utime = cpu_to_le64((__u64)mddev->utime);
1837 sb->events = cpu_to_le64(mddev->events);
1839 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1840 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1841 sb->resync_offset = cpu_to_le64(MaxSector);
1843 sb->resync_offset = cpu_to_le64(0);
1845 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1847 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1848 sb->size = cpu_to_le64(mddev->dev_sectors);
1849 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1850 sb->level = cpu_to_le32(mddev->level);
1851 sb->layout = cpu_to_le32(mddev->layout);
1852 if (test_bit(FailFast, &rdev->flags))
1853 sb->devflags |= FailFast1;
1855 sb->devflags &= ~FailFast1;
1857 if (test_bit(WriteMostly, &rdev->flags))
1858 sb->devflags |= WriteMostly1;
1860 sb->devflags &= ~WriteMostly1;
1861 sb->data_offset = cpu_to_le64(rdev->data_offset);
1862 sb->data_size = cpu_to_le64(rdev->sectors);
1864 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1865 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1866 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1869 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1870 !test_bit(In_sync, &rdev->flags)) {
1872 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1873 sb->recovery_offset =
1874 cpu_to_le64(rdev->recovery_offset);
1875 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1877 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1879 /* Note: recovery_offset and journal_tail share space */
1880 if (test_bit(Journal, &rdev->flags))
1881 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1882 if (test_bit(Replacement, &rdev->flags))
1884 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1886 if (mddev->reshape_position != MaxSector) {
1887 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1888 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1889 sb->new_layout = cpu_to_le32(mddev->new_layout);
1890 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1891 sb->new_level = cpu_to_le32(mddev->new_level);
1892 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1893 if (mddev->delta_disks == 0 &&
1894 mddev->reshape_backwards)
1896 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1897 if (rdev->new_data_offset != rdev->data_offset) {
1899 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1900 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1901 - rdev->data_offset));
1905 if (mddev_is_clustered(mddev))
1906 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1908 if (rdev->badblocks.count == 0)
1909 /* Nothing to do for bad blocks*/ ;
1910 else if (sb->bblog_offset == 0)
1911 /* Cannot record bad blocks on this device */
1912 md_error(mddev, rdev);
1914 struct badblocks *bb = &rdev->badblocks;
1915 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1917 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1922 seq = read_seqbegin(&bb->lock);
1924 memset(bbp, 0xff, PAGE_SIZE);
1926 for (i = 0 ; i < bb->count ; i++) {
1927 u64 internal_bb = p[i];
1928 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1929 | BB_LEN(internal_bb));
1930 bbp[i] = cpu_to_le64(store_bb);
1933 if (read_seqretry(&bb->lock, seq))
1936 bb->sector = (rdev->sb_start +
1937 (int)le32_to_cpu(sb->bblog_offset));
1938 bb->size = le16_to_cpu(sb->bblog_size);
1943 rdev_for_each(rdev2, mddev)
1944 if (rdev2->desc_nr+1 > max_dev)
1945 max_dev = rdev2->desc_nr+1;
1947 if (max_dev > le32_to_cpu(sb->max_dev)) {
1949 sb->max_dev = cpu_to_le32(max_dev);
1950 rdev->sb_size = max_dev * 2 + 256;
1951 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1952 if (rdev->sb_size & bmask)
1953 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1955 max_dev = le32_to_cpu(sb->max_dev);
1957 for (i=0; i<max_dev;i++)
1958 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1960 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1961 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1963 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
1964 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
1966 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
1968 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
1969 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
1970 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
1973 rdev_for_each(rdev2, mddev) {
1975 if (test_bit(Faulty, &rdev2->flags))
1976 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1977 else if (test_bit(In_sync, &rdev2->flags))
1978 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1979 else if (test_bit(Journal, &rdev2->flags))
1980 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1981 else if (rdev2->raid_disk >= 0)
1982 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1984 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1987 sb->sb_csum = calc_sb_1_csum(sb);
1990 static unsigned long long
1991 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1993 struct mdp_superblock_1 *sb;
1994 sector_t max_sectors;
1995 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1996 return 0; /* component must fit device */
1997 if (rdev->data_offset != rdev->new_data_offset)
1998 return 0; /* too confusing */
1999 if (rdev->sb_start < rdev->data_offset) {
2000 /* minor versions 1 and 2; superblock before data */
2001 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2002 max_sectors -= rdev->data_offset;
2003 if (!num_sectors || num_sectors > max_sectors)
2004 num_sectors = max_sectors;
2005 } else if (rdev->mddev->bitmap_info.offset) {
2006 /* minor version 0 with bitmap we can't move */
2009 /* minor version 0; superblock after data */
2011 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
2012 sb_start &= ~(sector_t)(4*2 - 1);
2013 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
2014 if (!num_sectors || num_sectors > max_sectors)
2015 num_sectors = max_sectors;
2016 rdev->sb_start = sb_start;
2018 sb = page_address(rdev->sb_page);
2019 sb->data_size = cpu_to_le64(num_sectors);
2020 sb->super_offset = cpu_to_le64(rdev->sb_start);
2021 sb->sb_csum = calc_sb_1_csum(sb);
2023 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2025 } while (md_super_wait(rdev->mddev) < 0);
2031 super_1_allow_new_offset(struct md_rdev *rdev,
2032 unsigned long long new_offset)
2034 /* All necessary checks on new >= old have been done */
2035 struct bitmap *bitmap;
2036 if (new_offset >= rdev->data_offset)
2039 /* with 1.0 metadata, there is no metadata to tread on
2040 * so we can always move back */
2041 if (rdev->mddev->minor_version == 0)
2044 /* otherwise we must be sure not to step on
2045 * any metadata, so stay:
2046 * 36K beyond start of superblock
2047 * beyond end of badblocks
2048 * beyond write-intent bitmap
2050 if (rdev->sb_start + (32+4)*2 > new_offset)
2052 bitmap = rdev->mddev->bitmap;
2053 if (bitmap && !rdev->mddev->bitmap_info.file &&
2054 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2055 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2057 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2063 static struct super_type super_types[] = {
2066 .owner = THIS_MODULE,
2067 .load_super = super_90_load,
2068 .validate_super = super_90_validate,
2069 .sync_super = super_90_sync,
2070 .rdev_size_change = super_90_rdev_size_change,
2071 .allow_new_offset = super_90_allow_new_offset,
2075 .owner = THIS_MODULE,
2076 .load_super = super_1_load,
2077 .validate_super = super_1_validate,
2078 .sync_super = super_1_sync,
2079 .rdev_size_change = super_1_rdev_size_change,
2080 .allow_new_offset = super_1_allow_new_offset,
2084 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2086 if (mddev->sync_super) {
2087 mddev->sync_super(mddev, rdev);
2091 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2093 super_types[mddev->major_version].sync_super(mddev, rdev);
2096 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2098 struct md_rdev *rdev, *rdev2;
2101 rdev_for_each_rcu(rdev, mddev1) {
2102 if (test_bit(Faulty, &rdev->flags) ||
2103 test_bit(Journal, &rdev->flags) ||
2104 rdev->raid_disk == -1)
2106 rdev_for_each_rcu(rdev2, mddev2) {
2107 if (test_bit(Faulty, &rdev2->flags) ||
2108 test_bit(Journal, &rdev2->flags) ||
2109 rdev2->raid_disk == -1)
2111 if (rdev->bdev->bd_contains ==
2112 rdev2->bdev->bd_contains) {
2122 static LIST_HEAD(pending_raid_disks);
2125 * Try to register data integrity profile for an mddev
2127 * This is called when an array is started and after a disk has been kicked
2128 * from the array. It only succeeds if all working and active component devices
2129 * are integrity capable with matching profiles.
2131 int md_integrity_register(struct mddev *mddev)
2133 struct md_rdev *rdev, *reference = NULL;
2135 if (list_empty(&mddev->disks))
2136 return 0; /* nothing to do */
2137 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2138 return 0; /* shouldn't register, or already is */
2139 rdev_for_each(rdev, mddev) {
2140 /* skip spares and non-functional disks */
2141 if (test_bit(Faulty, &rdev->flags))
2143 if (rdev->raid_disk < 0)
2146 /* Use the first rdev as the reference */
2150 /* does this rdev's profile match the reference profile? */
2151 if (blk_integrity_compare(reference->bdev->bd_disk,
2152 rdev->bdev->bd_disk) < 0)
2155 if (!reference || !bdev_get_integrity(reference->bdev))
2158 * All component devices are integrity capable and have matching
2159 * profiles, register the common profile for the md device.
2161 blk_integrity_register(mddev->gendisk,
2162 bdev_get_integrity(reference->bdev));
2164 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2165 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2166 pr_err("md: failed to create integrity pool for %s\n",
2172 EXPORT_SYMBOL(md_integrity_register);
2175 * Attempt to add an rdev, but only if it is consistent with the current
2178 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2180 struct blk_integrity *bi_rdev;
2181 struct blk_integrity *bi_mddev;
2182 char name[BDEVNAME_SIZE];
2184 if (!mddev->gendisk)
2187 bi_rdev = bdev_get_integrity(rdev->bdev);
2188 bi_mddev = blk_get_integrity(mddev->gendisk);
2190 if (!bi_mddev) /* nothing to do */
2193 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2194 pr_err("%s: incompatible integrity profile for %s\n",
2195 mdname(mddev), bdevname(rdev->bdev, name));
2201 EXPORT_SYMBOL(md_integrity_add_rdev);
2203 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2205 char b[BDEVNAME_SIZE];
2209 /* prevent duplicates */
2210 if (find_rdev(mddev, rdev->bdev->bd_dev))
2213 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2217 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2218 if (!test_bit(Journal, &rdev->flags) &&
2220 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2222 /* Cannot change size, so fail
2223 * If mddev->level <= 0, then we don't care
2224 * about aligning sizes (e.g. linear)
2226 if (mddev->level > 0)
2229 mddev->dev_sectors = rdev->sectors;
2232 /* Verify rdev->desc_nr is unique.
2233 * If it is -1, assign a free number, else
2234 * check number is not in use
2237 if (rdev->desc_nr < 0) {
2240 choice = mddev->raid_disks;
2241 while (md_find_rdev_nr_rcu(mddev, choice))
2243 rdev->desc_nr = choice;
2245 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2251 if (!test_bit(Journal, &rdev->flags) &&
2252 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2253 pr_warn("md: %s: array is limited to %d devices\n",
2254 mdname(mddev), mddev->max_disks);
2257 bdevname(rdev->bdev,b);
2258 strreplace(b, '/', '!');
2260 rdev->mddev = mddev;
2261 pr_debug("md: bind<%s>\n", b);
2263 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2266 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2267 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2268 /* failure here is OK */;
2269 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2271 list_add_rcu(&rdev->same_set, &mddev->disks);
2272 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2274 /* May as well allow recovery to be retried once */
2275 mddev->recovery_disabled++;
2280 pr_warn("md: failed to register dev-%s for %s\n",
2285 static void md_delayed_delete(struct work_struct *ws)
2287 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2288 kobject_del(&rdev->kobj);
2289 kobject_put(&rdev->kobj);
2292 static void unbind_rdev_from_array(struct md_rdev *rdev)
2294 char b[BDEVNAME_SIZE];
2296 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2297 list_del_rcu(&rdev->same_set);
2298 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2300 sysfs_remove_link(&rdev->kobj, "block");
2301 sysfs_put(rdev->sysfs_state);
2302 rdev->sysfs_state = NULL;
2303 rdev->badblocks.count = 0;
2304 /* We need to delay this, otherwise we can deadlock when
2305 * writing to 'remove' to "dev/state". We also need
2306 * to delay it due to rcu usage.
2309 INIT_WORK(&rdev->del_work, md_delayed_delete);
2310 kobject_get(&rdev->kobj);
2311 queue_work(md_misc_wq, &rdev->del_work);
2315 * prevent the device from being mounted, repartitioned or
2316 * otherwise reused by a RAID array (or any other kernel
2317 * subsystem), by bd_claiming the device.
2319 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2322 struct block_device *bdev;
2323 char b[BDEVNAME_SIZE];
2325 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2326 shared ? (struct md_rdev *)lock_rdev : rdev);
2328 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2329 return PTR_ERR(bdev);
2335 static void unlock_rdev(struct md_rdev *rdev)
2337 struct block_device *bdev = rdev->bdev;
2339 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2342 void md_autodetect_dev(dev_t dev);
2344 static void export_rdev(struct md_rdev *rdev)
2346 char b[BDEVNAME_SIZE];
2348 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2349 md_rdev_clear(rdev);
2351 if (test_bit(AutoDetected, &rdev->flags))
2352 md_autodetect_dev(rdev->bdev->bd_dev);
2355 kobject_put(&rdev->kobj);
2358 void md_kick_rdev_from_array(struct md_rdev *rdev)
2360 unbind_rdev_from_array(rdev);
2363 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2365 static void export_array(struct mddev *mddev)
2367 struct md_rdev *rdev;
2369 while (!list_empty(&mddev->disks)) {
2370 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2372 md_kick_rdev_from_array(rdev);
2374 mddev->raid_disks = 0;
2375 mddev->major_version = 0;
2378 static bool set_in_sync(struct mddev *mddev)
2380 WARN_ON_ONCE(NR_CPUS != 1 && !spin_is_locked(&mddev->lock));
2381 if (!mddev->in_sync) {
2382 mddev->sync_checkers++;
2383 spin_unlock(&mddev->lock);
2384 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2385 spin_lock(&mddev->lock);
2386 if (!mddev->in_sync &&
2387 percpu_ref_is_zero(&mddev->writes_pending)) {
2390 * Ensure ->in_sync is visible before we clear
2394 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2395 sysfs_notify_dirent_safe(mddev->sysfs_state);
2397 if (--mddev->sync_checkers == 0)
2398 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2400 if (mddev->safemode == 1)
2401 mddev->safemode = 0;
2402 return mddev->in_sync;
2405 static void sync_sbs(struct mddev *mddev, int nospares)
2407 /* Update each superblock (in-memory image), but
2408 * if we are allowed to, skip spares which already
2409 * have the right event counter, or have one earlier
2410 * (which would mean they aren't being marked as dirty
2411 * with the rest of the array)
2413 struct md_rdev *rdev;
2414 rdev_for_each(rdev, mddev) {
2415 if (rdev->sb_events == mddev->events ||
2417 rdev->raid_disk < 0 &&
2418 rdev->sb_events+1 == mddev->events)) {
2419 /* Don't update this superblock */
2420 rdev->sb_loaded = 2;
2422 sync_super(mddev, rdev);
2423 rdev->sb_loaded = 1;
2428 static bool does_sb_need_changing(struct mddev *mddev)
2430 struct md_rdev *rdev;
2431 struct mdp_superblock_1 *sb;
2434 /* Find a good rdev */
2435 rdev_for_each(rdev, mddev)
2436 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2439 /* No good device found. */
2443 sb = page_address(rdev->sb_page);
2444 /* Check if a device has become faulty or a spare become active */
2445 rdev_for_each(rdev, mddev) {
2446 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2447 /* Device activated? */
2448 if (role == 0xffff && rdev->raid_disk >=0 &&
2449 !test_bit(Faulty, &rdev->flags))
2451 /* Device turned faulty? */
2452 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2456 /* Check if any mddev parameters have changed */
2457 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2458 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2459 (mddev->layout != le32_to_cpu(sb->layout)) ||
2460 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2461 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2467 void md_update_sb(struct mddev *mddev, int force_change)
2469 struct md_rdev *rdev;
2472 int any_badblocks_changed = 0;
2477 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2482 if (mddev_is_clustered(mddev)) {
2483 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2485 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2487 ret = md_cluster_ops->metadata_update_start(mddev);
2488 /* Has someone else has updated the sb */
2489 if (!does_sb_need_changing(mddev)) {
2491 md_cluster_ops->metadata_update_cancel(mddev);
2492 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2493 BIT(MD_SB_CHANGE_DEVS) |
2494 BIT(MD_SB_CHANGE_CLEAN));
2499 /* First make sure individual recovery_offsets are correct */
2500 rdev_for_each(rdev, mddev) {
2501 if (rdev->raid_disk >= 0 &&
2502 mddev->delta_disks >= 0 &&
2503 !test_bit(Journal, &rdev->flags) &&
2504 !test_bit(In_sync, &rdev->flags) &&
2505 mddev->curr_resync_completed > rdev->recovery_offset)
2506 rdev->recovery_offset = mddev->curr_resync_completed;
2509 if (!mddev->persistent) {
2510 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2511 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2512 if (!mddev->external) {
2513 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2514 rdev_for_each(rdev, mddev) {
2515 if (rdev->badblocks.changed) {
2516 rdev->badblocks.changed = 0;
2517 ack_all_badblocks(&rdev->badblocks);
2518 md_error(mddev, rdev);
2520 clear_bit(Blocked, &rdev->flags);
2521 clear_bit(BlockedBadBlocks, &rdev->flags);
2522 wake_up(&rdev->blocked_wait);
2525 wake_up(&mddev->sb_wait);
2529 spin_lock(&mddev->lock);
2531 mddev->utime = ktime_get_real_seconds();
2533 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2535 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2536 /* just a clean<-> dirty transition, possibly leave spares alone,
2537 * though if events isn't the right even/odd, we will have to do
2543 if (mddev->degraded)
2544 /* If the array is degraded, then skipping spares is both
2545 * dangerous and fairly pointless.
2546 * Dangerous because a device that was removed from the array
2547 * might have a event_count that still looks up-to-date,
2548 * so it can be re-added without a resync.
2549 * Pointless because if there are any spares to skip,
2550 * then a recovery will happen and soon that array won't
2551 * be degraded any more and the spare can go back to sleep then.
2555 sync_req = mddev->in_sync;
2557 /* If this is just a dirty<->clean transition, and the array is clean
2558 * and 'events' is odd, we can roll back to the previous clean state */
2560 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2561 && mddev->can_decrease_events
2562 && mddev->events != 1) {
2564 mddev->can_decrease_events = 0;
2566 /* otherwise we have to go forward and ... */
2568 mddev->can_decrease_events = nospares;
2572 * This 64-bit counter should never wrap.
2573 * Either we are in around ~1 trillion A.C., assuming
2574 * 1 reboot per second, or we have a bug...
2576 WARN_ON(mddev->events == 0);
2578 rdev_for_each(rdev, mddev) {
2579 if (rdev->badblocks.changed)
2580 any_badblocks_changed++;
2581 if (test_bit(Faulty, &rdev->flags))
2582 set_bit(FaultRecorded, &rdev->flags);
2585 sync_sbs(mddev, nospares);
2586 spin_unlock(&mddev->lock);
2588 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2589 mdname(mddev), mddev->in_sync);
2592 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2594 bitmap_update_sb(mddev->bitmap);
2595 rdev_for_each(rdev, mddev) {
2596 char b[BDEVNAME_SIZE];
2598 if (rdev->sb_loaded != 1)
2599 continue; /* no noise on spare devices */
2601 if (!test_bit(Faulty, &rdev->flags)) {
2602 md_super_write(mddev,rdev,
2603 rdev->sb_start, rdev->sb_size,
2605 pr_debug("md: (write) %s's sb offset: %llu\n",
2606 bdevname(rdev->bdev, b),
2607 (unsigned long long)rdev->sb_start);
2608 rdev->sb_events = mddev->events;
2609 if (rdev->badblocks.size) {
2610 md_super_write(mddev, rdev,
2611 rdev->badblocks.sector,
2612 rdev->badblocks.size << 9,
2614 rdev->badblocks.size = 0;
2618 pr_debug("md: %s (skipping faulty)\n",
2619 bdevname(rdev->bdev, b));
2621 if (mddev->level == LEVEL_MULTIPATH)
2622 /* only need to write one superblock... */
2625 if (md_super_wait(mddev) < 0)
2627 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2629 if (mddev_is_clustered(mddev) && ret == 0)
2630 md_cluster_ops->metadata_update_finish(mddev);
2632 if (mddev->in_sync != sync_req ||
2633 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2634 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2635 /* have to write it out again */
2637 wake_up(&mddev->sb_wait);
2638 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2639 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2641 rdev_for_each(rdev, mddev) {
2642 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2643 clear_bit(Blocked, &rdev->flags);
2645 if (any_badblocks_changed)
2646 ack_all_badblocks(&rdev->badblocks);
2647 clear_bit(BlockedBadBlocks, &rdev->flags);
2648 wake_up(&rdev->blocked_wait);
2651 EXPORT_SYMBOL(md_update_sb);
2653 static int add_bound_rdev(struct md_rdev *rdev)
2655 struct mddev *mddev = rdev->mddev;
2657 bool add_journal = test_bit(Journal, &rdev->flags);
2659 if (!mddev->pers->hot_remove_disk || add_journal) {
2660 /* If there is hot_add_disk but no hot_remove_disk
2661 * then added disks for geometry changes,
2662 * and should be added immediately.
2664 super_types[mddev->major_version].
2665 validate_super(mddev, rdev);
2667 mddev_suspend(mddev);
2668 err = mddev->pers->hot_add_disk(mddev, rdev);
2670 mddev_resume(mddev);
2672 md_kick_rdev_from_array(rdev);
2676 sysfs_notify_dirent_safe(rdev->sysfs_state);
2678 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2679 if (mddev->degraded)
2680 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2681 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2682 md_new_event(mddev);
2683 md_wakeup_thread(mddev->thread);
2687 /* words written to sysfs files may, or may not, be \n terminated.
2688 * We want to accept with case. For this we use cmd_match.
2690 static int cmd_match(const char *cmd, const char *str)
2692 /* See if cmd, written into a sysfs file, matches
2693 * str. They must either be the same, or cmd can
2694 * have a trailing newline
2696 while (*cmd && *str && *cmd == *str) {
2707 struct rdev_sysfs_entry {
2708 struct attribute attr;
2709 ssize_t (*show)(struct md_rdev *, char *);
2710 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2714 state_show(struct md_rdev *rdev, char *page)
2718 unsigned long flags = ACCESS_ONCE(rdev->flags);
2720 if (test_bit(Faulty, &flags) ||
2721 (!test_bit(ExternalBbl, &flags) &&
2722 rdev->badblocks.unacked_exist))
2723 len += sprintf(page+len, "faulty%s", sep);
2724 if (test_bit(In_sync, &flags))
2725 len += sprintf(page+len, "in_sync%s", sep);
2726 if (test_bit(Journal, &flags))
2727 len += sprintf(page+len, "journal%s", sep);
2728 if (test_bit(WriteMostly, &flags))
2729 len += sprintf(page+len, "write_mostly%s", sep);
2730 if (test_bit(Blocked, &flags) ||
2731 (rdev->badblocks.unacked_exist
2732 && !test_bit(Faulty, &flags)))
2733 len += sprintf(page+len, "blocked%s", sep);
2734 if (!test_bit(Faulty, &flags) &&
2735 !test_bit(Journal, &flags) &&
2736 !test_bit(In_sync, &flags))
2737 len += sprintf(page+len, "spare%s", sep);
2738 if (test_bit(WriteErrorSeen, &flags))
2739 len += sprintf(page+len, "write_error%s", sep);
2740 if (test_bit(WantReplacement, &flags))
2741 len += sprintf(page+len, "want_replacement%s", sep);
2742 if (test_bit(Replacement, &flags))
2743 len += sprintf(page+len, "replacement%s", sep);
2744 if (test_bit(ExternalBbl, &flags))
2745 len += sprintf(page+len, "external_bbl%s", sep);
2746 if (test_bit(FailFast, &flags))
2747 len += sprintf(page+len, "failfast%s", sep);
2752 return len+sprintf(page+len, "\n");
2756 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2759 * faulty - simulates an error
2760 * remove - disconnects the device
2761 * writemostly - sets write_mostly
2762 * -writemostly - clears write_mostly
2763 * blocked - sets the Blocked flags
2764 * -blocked - clears the Blocked and possibly simulates an error
2765 * insync - sets Insync providing device isn't active
2766 * -insync - clear Insync for a device with a slot assigned,
2767 * so that it gets rebuilt based on bitmap
2768 * write_error - sets WriteErrorSeen
2769 * -write_error - clears WriteErrorSeen
2770 * {,-}failfast - set/clear FailFast
2773 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2774 md_error(rdev->mddev, rdev);
2775 if (test_bit(Faulty, &rdev->flags))
2779 } else if (cmd_match(buf, "remove")) {
2780 if (rdev->mddev->pers) {
2781 clear_bit(Blocked, &rdev->flags);
2782 remove_and_add_spares(rdev->mddev, rdev);
2784 if (rdev->raid_disk >= 0)
2787 struct mddev *mddev = rdev->mddev;
2789 if (mddev_is_clustered(mddev))
2790 err = md_cluster_ops->remove_disk(mddev, rdev);
2793 md_kick_rdev_from_array(rdev);
2795 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2796 md_wakeup_thread(mddev->thread);
2798 md_new_event(mddev);
2801 } else if (cmd_match(buf, "writemostly")) {
2802 set_bit(WriteMostly, &rdev->flags);
2804 } else if (cmd_match(buf, "-writemostly")) {
2805 clear_bit(WriteMostly, &rdev->flags);
2807 } else if (cmd_match(buf, "blocked")) {
2808 set_bit(Blocked, &rdev->flags);
2810 } else if (cmd_match(buf, "-blocked")) {
2811 if (!test_bit(Faulty, &rdev->flags) &&
2812 !test_bit(ExternalBbl, &rdev->flags) &&
2813 rdev->badblocks.unacked_exist) {
2814 /* metadata handler doesn't understand badblocks,
2815 * so we need to fail the device
2817 md_error(rdev->mddev, rdev);
2819 clear_bit(Blocked, &rdev->flags);
2820 clear_bit(BlockedBadBlocks, &rdev->flags);
2821 wake_up(&rdev->blocked_wait);
2822 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2823 md_wakeup_thread(rdev->mddev->thread);
2826 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2827 set_bit(In_sync, &rdev->flags);
2829 } else if (cmd_match(buf, "failfast")) {
2830 set_bit(FailFast, &rdev->flags);
2832 } else if (cmd_match(buf, "-failfast")) {
2833 clear_bit(FailFast, &rdev->flags);
2835 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2836 !test_bit(Journal, &rdev->flags)) {
2837 if (rdev->mddev->pers == NULL) {
2838 clear_bit(In_sync, &rdev->flags);
2839 rdev->saved_raid_disk = rdev->raid_disk;
2840 rdev->raid_disk = -1;
2843 } else if (cmd_match(buf, "write_error")) {
2844 set_bit(WriteErrorSeen, &rdev->flags);
2846 } else if (cmd_match(buf, "-write_error")) {
2847 clear_bit(WriteErrorSeen, &rdev->flags);
2849 } else if (cmd_match(buf, "want_replacement")) {
2850 /* Any non-spare device that is not a replacement can
2851 * become want_replacement at any time, but we then need to
2852 * check if recovery is needed.
2854 if (rdev->raid_disk >= 0 &&
2855 !test_bit(Journal, &rdev->flags) &&
2856 !test_bit(Replacement, &rdev->flags))
2857 set_bit(WantReplacement, &rdev->flags);
2858 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2859 md_wakeup_thread(rdev->mddev->thread);
2861 } else if (cmd_match(buf, "-want_replacement")) {
2862 /* Clearing 'want_replacement' is always allowed.
2863 * Once replacements starts it is too late though.
2866 clear_bit(WantReplacement, &rdev->flags);
2867 } else if (cmd_match(buf, "replacement")) {
2868 /* Can only set a device as a replacement when array has not
2869 * yet been started. Once running, replacement is automatic
2870 * from spares, or by assigning 'slot'.
2872 if (rdev->mddev->pers)
2875 set_bit(Replacement, &rdev->flags);
2878 } else if (cmd_match(buf, "-replacement")) {
2879 /* Similarly, can only clear Replacement before start */
2880 if (rdev->mddev->pers)
2883 clear_bit(Replacement, &rdev->flags);
2886 } else if (cmd_match(buf, "re-add")) {
2887 if (!rdev->mddev->pers)
2889 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2890 rdev->saved_raid_disk >= 0) {
2891 /* clear_bit is performed _after_ all the devices
2892 * have their local Faulty bit cleared. If any writes
2893 * happen in the meantime in the local node, they
2894 * will land in the local bitmap, which will be synced
2895 * by this node eventually
2897 if (!mddev_is_clustered(rdev->mddev) ||
2898 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2899 clear_bit(Faulty, &rdev->flags);
2900 err = add_bound_rdev(rdev);
2904 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2905 set_bit(ExternalBbl, &rdev->flags);
2906 rdev->badblocks.shift = 0;
2908 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2909 clear_bit(ExternalBbl, &rdev->flags);
2913 sysfs_notify_dirent_safe(rdev->sysfs_state);
2914 return err ? err : len;
2916 static struct rdev_sysfs_entry rdev_state =
2917 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2920 errors_show(struct md_rdev *rdev, char *page)
2922 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2926 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2931 rv = kstrtouint(buf, 10, &n);
2934 atomic_set(&rdev->corrected_errors, n);
2937 static struct rdev_sysfs_entry rdev_errors =
2938 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2941 slot_show(struct md_rdev *rdev, char *page)
2943 if (test_bit(Journal, &rdev->flags))
2944 return sprintf(page, "journal\n");
2945 else if (rdev->raid_disk < 0)
2946 return sprintf(page, "none\n");
2948 return sprintf(page, "%d\n", rdev->raid_disk);
2952 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2957 if (test_bit(Journal, &rdev->flags))
2959 if (strncmp(buf, "none", 4)==0)
2962 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2966 if (rdev->mddev->pers && slot == -1) {
2967 /* Setting 'slot' on an active array requires also
2968 * updating the 'rd%d' link, and communicating
2969 * with the personality with ->hot_*_disk.
2970 * For now we only support removing
2971 * failed/spare devices. This normally happens automatically,
2972 * but not when the metadata is externally managed.
2974 if (rdev->raid_disk == -1)
2976 /* personality does all needed checks */
2977 if (rdev->mddev->pers->hot_remove_disk == NULL)
2979 clear_bit(Blocked, &rdev->flags);
2980 remove_and_add_spares(rdev->mddev, rdev);
2981 if (rdev->raid_disk >= 0)
2983 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2984 md_wakeup_thread(rdev->mddev->thread);
2985 } else if (rdev->mddev->pers) {
2986 /* Activating a spare .. or possibly reactivating
2987 * if we ever get bitmaps working here.
2991 if (rdev->raid_disk != -1)
2994 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2997 if (rdev->mddev->pers->hot_add_disk == NULL)
3000 if (slot >= rdev->mddev->raid_disks &&
3001 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3004 rdev->raid_disk = slot;
3005 if (test_bit(In_sync, &rdev->flags))
3006 rdev->saved_raid_disk = slot;
3008 rdev->saved_raid_disk = -1;
3009 clear_bit(In_sync, &rdev->flags);
3010 clear_bit(Bitmap_sync, &rdev->flags);
3011 err = rdev->mddev->pers->
3012 hot_add_disk(rdev->mddev, rdev);
3014 rdev->raid_disk = -1;
3017 sysfs_notify_dirent_safe(rdev->sysfs_state);
3018 if (sysfs_link_rdev(rdev->mddev, rdev))
3019 /* failure here is OK */;
3020 /* don't wakeup anyone, leave that to userspace. */
3022 if (slot >= rdev->mddev->raid_disks &&
3023 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3025 rdev->raid_disk = slot;
3026 /* assume it is working */
3027 clear_bit(Faulty, &rdev->flags);
3028 clear_bit(WriteMostly, &rdev->flags);
3029 set_bit(In_sync, &rdev->flags);
3030 sysfs_notify_dirent_safe(rdev->sysfs_state);
3035 static struct rdev_sysfs_entry rdev_slot =
3036 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3039 offset_show(struct md_rdev *rdev, char *page)
3041 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3045 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3047 unsigned long long offset;
3048 if (kstrtoull(buf, 10, &offset) < 0)
3050 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3052 if (rdev->sectors && rdev->mddev->external)
3053 /* Must set offset before size, so overlap checks
3056 rdev->data_offset = offset;
3057 rdev->new_data_offset = offset;
3061 static struct rdev_sysfs_entry rdev_offset =
3062 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3064 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3066 return sprintf(page, "%llu\n",
3067 (unsigned long long)rdev->new_data_offset);
3070 static ssize_t new_offset_store(struct md_rdev *rdev,
3071 const char *buf, size_t len)
3073 unsigned long long new_offset;
3074 struct mddev *mddev = rdev->mddev;
3076 if (kstrtoull(buf, 10, &new_offset) < 0)
3079 if (mddev->sync_thread ||
3080 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3082 if (new_offset == rdev->data_offset)
3083 /* reset is always permitted */
3085 else if (new_offset > rdev->data_offset) {
3086 /* must not push array size beyond rdev_sectors */
3087 if (new_offset - rdev->data_offset
3088 + mddev->dev_sectors > rdev->sectors)
3091 /* Metadata worries about other space details. */
3093 /* decreasing the offset is inconsistent with a backwards
3096 if (new_offset < rdev->data_offset &&
3097 mddev->reshape_backwards)
3099 /* Increasing offset is inconsistent with forwards
3100 * reshape. reshape_direction should be set to
3101 * 'backwards' first.
3103 if (new_offset > rdev->data_offset &&
3104 !mddev->reshape_backwards)
3107 if (mddev->pers && mddev->persistent &&
3108 !super_types[mddev->major_version]
3109 .allow_new_offset(rdev, new_offset))
3111 rdev->new_data_offset = new_offset;
3112 if (new_offset > rdev->data_offset)
3113 mddev->reshape_backwards = 1;
3114 else if (new_offset < rdev->data_offset)
3115 mddev->reshape_backwards = 0;
3119 static struct rdev_sysfs_entry rdev_new_offset =
3120 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3123 rdev_size_show(struct md_rdev *rdev, char *page)
3125 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3128 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3130 /* check if two start/length pairs overlap */
3138 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3140 unsigned long long blocks;
3143 if (kstrtoull(buf, 10, &blocks) < 0)
3146 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3147 return -EINVAL; /* sector conversion overflow */
3150 if (new != blocks * 2)
3151 return -EINVAL; /* unsigned long long to sector_t overflow */
3158 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3160 struct mddev *my_mddev = rdev->mddev;
3161 sector_t oldsectors = rdev->sectors;
3164 if (test_bit(Journal, &rdev->flags))
3166 if (strict_blocks_to_sectors(buf, §ors) < 0)
3168 if (rdev->data_offset != rdev->new_data_offset)
3169 return -EINVAL; /* too confusing */
3170 if (my_mddev->pers && rdev->raid_disk >= 0) {
3171 if (my_mddev->persistent) {
3172 sectors = super_types[my_mddev->major_version].
3173 rdev_size_change(rdev, sectors);
3176 } else if (!sectors)
3177 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3179 if (!my_mddev->pers->resize)
3180 /* Cannot change size for RAID0 or Linear etc */
3183 if (sectors < my_mddev->dev_sectors)
3184 return -EINVAL; /* component must fit device */
3186 rdev->sectors = sectors;
3187 if (sectors > oldsectors && my_mddev->external) {
3188 /* Need to check that all other rdevs with the same
3189 * ->bdev do not overlap. 'rcu' is sufficient to walk
3190 * the rdev lists safely.
3191 * This check does not provide a hard guarantee, it
3192 * just helps avoid dangerous mistakes.
3194 struct mddev *mddev;
3196 struct list_head *tmp;
3199 for_each_mddev(mddev, tmp) {
3200 struct md_rdev *rdev2;
3202 rdev_for_each(rdev2, mddev)
3203 if (rdev->bdev == rdev2->bdev &&
3205 overlaps(rdev->data_offset, rdev->sectors,
3218 /* Someone else could have slipped in a size
3219 * change here, but doing so is just silly.
3220 * We put oldsectors back because we *know* it is
3221 * safe, and trust userspace not to race with
3224 rdev->sectors = oldsectors;
3231 static struct rdev_sysfs_entry rdev_size =
3232 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3234 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3236 unsigned long long recovery_start = rdev->recovery_offset;
3238 if (test_bit(In_sync, &rdev->flags) ||
3239 recovery_start == MaxSector)
3240 return sprintf(page, "none\n");
3242 return sprintf(page, "%llu\n", recovery_start);
3245 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3247 unsigned long long recovery_start;
3249 if (cmd_match(buf, "none"))
3250 recovery_start = MaxSector;
3251 else if (kstrtoull(buf, 10, &recovery_start))
3254 if (rdev->mddev->pers &&
3255 rdev->raid_disk >= 0)
3258 rdev->recovery_offset = recovery_start;
3259 if (recovery_start == MaxSector)
3260 set_bit(In_sync, &rdev->flags);
3262 clear_bit(In_sync, &rdev->flags);
3266 static struct rdev_sysfs_entry rdev_recovery_start =
3267 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3269 /* sysfs access to bad-blocks list.
3270 * We present two files.
3271 * 'bad-blocks' lists sector numbers and lengths of ranges that
3272 * are recorded as bad. The list is truncated to fit within
3273 * the one-page limit of sysfs.
3274 * Writing "sector length" to this file adds an acknowledged
3276 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3277 * been acknowledged. Writing to this file adds bad blocks
3278 * without acknowledging them. This is largely for testing.
3280 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3282 return badblocks_show(&rdev->badblocks, page, 0);
3284 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3286 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3287 /* Maybe that ack was all we needed */
3288 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3289 wake_up(&rdev->blocked_wait);
3292 static struct rdev_sysfs_entry rdev_bad_blocks =
3293 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3295 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3297 return badblocks_show(&rdev->badblocks, page, 1);
3299 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3301 return badblocks_store(&rdev->badblocks, page, len, 1);
3303 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3304 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3307 ppl_sector_show(struct md_rdev *rdev, char *page)
3309 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3313 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3315 unsigned long long sector;
3317 if (kstrtoull(buf, 10, §or) < 0)
3319 if (sector != (sector_t)sector)
3322 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3323 rdev->raid_disk >= 0)
3326 if (rdev->mddev->persistent) {
3327 if (rdev->mddev->major_version == 0)
3329 if ((sector > rdev->sb_start &&
3330 sector - rdev->sb_start > S16_MAX) ||
3331 (sector < rdev->sb_start &&
3332 rdev->sb_start - sector > -S16_MIN))
3334 rdev->ppl.offset = sector - rdev->sb_start;
3335 } else if (!rdev->mddev->external) {
3338 rdev->ppl.sector = sector;
3342 static struct rdev_sysfs_entry rdev_ppl_sector =
3343 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3346 ppl_size_show(struct md_rdev *rdev, char *page)
3348 return sprintf(page, "%u\n", rdev->ppl.size);
3352 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3356 if (kstrtouint(buf, 10, &size) < 0)
3359 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3360 rdev->raid_disk >= 0)
3363 if (rdev->mddev->persistent) {
3364 if (rdev->mddev->major_version == 0)
3368 } else if (!rdev->mddev->external) {
3371 rdev->ppl.size = size;
3375 static struct rdev_sysfs_entry rdev_ppl_size =
3376 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3378 static struct attribute *rdev_default_attrs[] = {
3383 &rdev_new_offset.attr,
3385 &rdev_recovery_start.attr,
3386 &rdev_bad_blocks.attr,
3387 &rdev_unack_bad_blocks.attr,
3388 &rdev_ppl_sector.attr,
3389 &rdev_ppl_size.attr,
3393 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3395 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3396 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3402 return entry->show(rdev, page);
3406 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3407 const char *page, size_t length)
3409 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3410 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3412 struct mddev *mddev = rdev->mddev;
3416 if (!capable(CAP_SYS_ADMIN))
3418 rv = mddev ? mddev_lock(mddev): -EBUSY;
3420 if (rdev->mddev == NULL)
3423 rv = entry->store(rdev, page, length);
3424 mddev_unlock(mddev);
3429 static void rdev_free(struct kobject *ko)
3431 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3434 static const struct sysfs_ops rdev_sysfs_ops = {
3435 .show = rdev_attr_show,
3436 .store = rdev_attr_store,
3438 static struct kobj_type rdev_ktype = {
3439 .release = rdev_free,
3440 .sysfs_ops = &rdev_sysfs_ops,
3441 .default_attrs = rdev_default_attrs,
3444 int md_rdev_init(struct md_rdev *rdev)
3447 rdev->saved_raid_disk = -1;
3448 rdev->raid_disk = -1;
3450 rdev->data_offset = 0;
3451 rdev->new_data_offset = 0;
3452 rdev->sb_events = 0;
3453 rdev->last_read_error = 0;
3454 rdev->sb_loaded = 0;
3455 rdev->bb_page = NULL;
3456 atomic_set(&rdev->nr_pending, 0);
3457 atomic_set(&rdev->read_errors, 0);
3458 atomic_set(&rdev->corrected_errors, 0);
3460 INIT_LIST_HEAD(&rdev->same_set);
3461 init_waitqueue_head(&rdev->blocked_wait);
3463 /* Add space to store bad block list.
3464 * This reserves the space even on arrays where it cannot
3465 * be used - I wonder if that matters
3467 return badblocks_init(&rdev->badblocks, 0);
3469 EXPORT_SYMBOL_GPL(md_rdev_init);
3471 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3473 * mark the device faulty if:
3475 * - the device is nonexistent (zero size)
3476 * - the device has no valid superblock
3478 * a faulty rdev _never_ has rdev->sb set.
3480 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3482 char b[BDEVNAME_SIZE];
3484 struct md_rdev *rdev;
3487 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3489 return ERR_PTR(-ENOMEM);
3491 err = md_rdev_init(rdev);
3494 err = alloc_disk_sb(rdev);
3498 err = lock_rdev(rdev, newdev, super_format == -2);
3502 kobject_init(&rdev->kobj, &rdev_ktype);
3504 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3506 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3507 bdevname(rdev->bdev,b));
3512 if (super_format >= 0) {
3513 err = super_types[super_format].
3514 load_super(rdev, NULL, super_minor);
3515 if (err == -EINVAL) {
3516 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3517 bdevname(rdev->bdev,b),
3518 super_format, super_minor);
3522 pr_warn("md: could not read %s's sb, not importing!\n",
3523 bdevname(rdev->bdev,b));
3533 md_rdev_clear(rdev);
3535 return ERR_PTR(err);
3539 * Check a full RAID array for plausibility
3542 static void analyze_sbs(struct mddev *mddev)
3545 struct md_rdev *rdev, *freshest, *tmp;
3546 char b[BDEVNAME_SIZE];
3549 rdev_for_each_safe(rdev, tmp, mddev)
3550 switch (super_types[mddev->major_version].
3551 load_super(rdev, freshest, mddev->minor_version)) {
3558 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3559 bdevname(rdev->bdev,b));
3560 md_kick_rdev_from_array(rdev);
3563 super_types[mddev->major_version].
3564 validate_super(mddev, freshest);
3567 rdev_for_each_safe(rdev, tmp, mddev) {
3568 if (mddev->max_disks &&
3569 (rdev->desc_nr >= mddev->max_disks ||
3570 i > mddev->max_disks)) {
3571 pr_warn("md: %s: %s: only %d devices permitted\n",
3572 mdname(mddev), bdevname(rdev->bdev, b),
3574 md_kick_rdev_from_array(rdev);
3577 if (rdev != freshest) {
3578 if (super_types[mddev->major_version].
3579 validate_super(mddev, rdev)) {
3580 pr_warn("md: kicking non-fresh %s from array!\n",
3581 bdevname(rdev->bdev,b));
3582 md_kick_rdev_from_array(rdev);
3586 if (mddev->level == LEVEL_MULTIPATH) {
3587 rdev->desc_nr = i++;
3588 rdev->raid_disk = rdev->desc_nr;
3589 set_bit(In_sync, &rdev->flags);
3590 } else if (rdev->raid_disk >=
3591 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3592 !test_bit(Journal, &rdev->flags)) {
3593 rdev->raid_disk = -1;
3594 clear_bit(In_sync, &rdev->flags);
3599 /* Read a fixed-point number.
3600 * Numbers in sysfs attributes should be in "standard" units where
3601 * possible, so time should be in seconds.
3602 * However we internally use a a much smaller unit such as
3603 * milliseconds or jiffies.
3604 * This function takes a decimal number with a possible fractional
3605 * component, and produces an integer which is the result of
3606 * multiplying that number by 10^'scale'.
3607 * all without any floating-point arithmetic.
3609 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3611 unsigned long result = 0;
3613 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3616 else if (decimals < scale) {
3619 result = result * 10 + value;
3631 while (decimals < scale) {
3640 safe_delay_show(struct mddev *mddev, char *page)
3642 int msec = (mddev->safemode_delay*1000)/HZ;
3643 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3646 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3650 if (mddev_is_clustered(mddev)) {
3651 pr_warn("md: Safemode is disabled for clustered mode\n");
3655 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3658 mddev->safemode_delay = 0;
3660 unsigned long old_delay = mddev->safemode_delay;
3661 unsigned long new_delay = (msec*HZ)/1000;
3665 mddev->safemode_delay = new_delay;
3666 if (new_delay < old_delay || old_delay == 0)
3667 mod_timer(&mddev->safemode_timer, jiffies+1);
3671 static struct md_sysfs_entry md_safe_delay =
3672 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3675 level_show(struct mddev *mddev, char *page)
3677 struct md_personality *p;
3679 spin_lock(&mddev->lock);
3682 ret = sprintf(page, "%s\n", p->name);
3683 else if (mddev->clevel[0])
3684 ret = sprintf(page, "%s\n", mddev->clevel);
3685 else if (mddev->level != LEVEL_NONE)
3686 ret = sprintf(page, "%d\n", mddev->level);
3689 spin_unlock(&mddev->lock);
3694 level_store(struct mddev *mddev, const char *buf, size_t len)
3699 struct md_personality *pers, *oldpers;
3701 void *priv, *oldpriv;
3702 struct md_rdev *rdev;
3704 if (slen == 0 || slen >= sizeof(clevel))
3707 rv = mddev_lock(mddev);
3711 if (mddev->pers == NULL) {
3712 strncpy(mddev->clevel, buf, slen);
3713 if (mddev->clevel[slen-1] == '\n')
3715 mddev->clevel[slen] = 0;
3716 mddev->level = LEVEL_NONE;
3724 /* request to change the personality. Need to ensure:
3725 * - array is not engaged in resync/recovery/reshape
3726 * - old personality can be suspended
3727 * - new personality will access other array.
3731 if (mddev->sync_thread ||
3732 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3733 mddev->reshape_position != MaxSector ||
3734 mddev->sysfs_active)
3738 if (!mddev->pers->quiesce) {
3739 pr_warn("md: %s: %s does not support online personality change\n",
3740 mdname(mddev), mddev->pers->name);
3744 /* Now find the new personality */
3745 strncpy(clevel, buf, slen);
3746 if (clevel[slen-1] == '\n')
3749 if (kstrtol(clevel, 10, &level))
3752 if (request_module("md-%s", clevel) != 0)
3753 request_module("md-level-%s", clevel);
3754 spin_lock(&pers_lock);
3755 pers = find_pers(level, clevel);
3756 if (!pers || !try_module_get(pers->owner)) {
3757 spin_unlock(&pers_lock);
3758 pr_warn("md: personality %s not loaded\n", clevel);
3762 spin_unlock(&pers_lock);
3764 if (pers == mddev->pers) {
3765 /* Nothing to do! */
3766 module_put(pers->owner);
3770 if (!pers->takeover) {
3771 module_put(pers->owner);
3772 pr_warn("md: %s: %s does not support personality takeover\n",
3773 mdname(mddev), clevel);
3778 rdev_for_each(rdev, mddev)
3779 rdev->new_raid_disk = rdev->raid_disk;
3781 /* ->takeover must set new_* and/or delta_disks
3782 * if it succeeds, and may set them when it fails.
3784 priv = pers->takeover(mddev);
3786 mddev->new_level = mddev->level;
3787 mddev->new_layout = mddev->layout;
3788 mddev->new_chunk_sectors = mddev->chunk_sectors;
3789 mddev->raid_disks -= mddev->delta_disks;
3790 mddev->delta_disks = 0;
3791 mddev->reshape_backwards = 0;
3792 module_put(pers->owner);
3793 pr_warn("md: %s: %s would not accept array\n",
3794 mdname(mddev), clevel);
3799 /* Looks like we have a winner */
3800 mddev_suspend(mddev);
3801 mddev_detach(mddev);
3803 spin_lock(&mddev->lock);
3804 oldpers = mddev->pers;
3805 oldpriv = mddev->private;
3807 mddev->private = priv;
3808 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3809 mddev->level = mddev->new_level;
3810 mddev->layout = mddev->new_layout;
3811 mddev->chunk_sectors = mddev->new_chunk_sectors;
3812 mddev->delta_disks = 0;
3813 mddev->reshape_backwards = 0;
3814 mddev->degraded = 0;
3815 spin_unlock(&mddev->lock);
3817 if (oldpers->sync_request == NULL &&
3819 /* We are converting from a no-redundancy array
3820 * to a redundancy array and metadata is managed
3821 * externally so we need to be sure that writes
3822 * won't block due to a need to transition
3824 * until external management is started.
3827 mddev->safemode_delay = 0;
3828 mddev->safemode = 0;
3831 oldpers->free(mddev, oldpriv);
3833 if (oldpers->sync_request == NULL &&
3834 pers->sync_request != NULL) {
3835 /* need to add the md_redundancy_group */
3836 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3837 pr_warn("md: cannot register extra attributes for %s\n",
3839 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3841 if (oldpers->sync_request != NULL &&
3842 pers->sync_request == NULL) {
3843 /* need to remove the md_redundancy_group */
3844 if (mddev->to_remove == NULL)
3845 mddev->to_remove = &md_redundancy_group;
3848 module_put(oldpers->owner);
3850 rdev_for_each(rdev, mddev) {
3851 if (rdev->raid_disk < 0)
3853 if (rdev->new_raid_disk >= mddev->raid_disks)
3854 rdev->new_raid_disk = -1;
3855 if (rdev->new_raid_disk == rdev->raid_disk)
3857 sysfs_unlink_rdev(mddev, rdev);
3859 rdev_for_each(rdev, mddev) {
3860 if (rdev->raid_disk < 0)
3862 if (rdev->new_raid_disk == rdev->raid_disk)
3864 rdev->raid_disk = rdev->new_raid_disk;
3865 if (rdev->raid_disk < 0)
3866 clear_bit(In_sync, &rdev->flags);
3868 if (sysfs_link_rdev(mddev, rdev))
3869 pr_warn("md: cannot register rd%d for %s after level change\n",
3870 rdev->raid_disk, mdname(mddev));
3874 if (pers->sync_request == NULL) {
3875 /* this is now an array without redundancy, so
3876 * it must always be in_sync
3879 del_timer_sync(&mddev->safemode_timer);
3881 blk_set_stacking_limits(&mddev->queue->limits);
3883 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3884 mddev_resume(mddev);
3886 md_update_sb(mddev, 1);
3887 sysfs_notify(&mddev->kobj, NULL, "level");
3888 md_new_event(mddev);
3891 mddev_unlock(mddev);
3895 static struct md_sysfs_entry md_level =
3896 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3899 layout_show(struct mddev *mddev, char *page)
3901 /* just a number, not meaningful for all levels */
3902 if (mddev->reshape_position != MaxSector &&
3903 mddev->layout != mddev->new_layout)
3904 return sprintf(page, "%d (%d)\n",
3905 mddev->new_layout, mddev->layout);
3906 return sprintf(page, "%d\n", mddev->layout);
3910 layout_store(struct mddev *mddev, const char *buf, size_t len)
3915 err = kstrtouint(buf, 10, &n);
3918 err = mddev_lock(mddev);
3923 if (mddev->pers->check_reshape == NULL)
3928 mddev->new_layout = n;
3929 err = mddev->pers->check_reshape(mddev);
3931 mddev->new_layout = mddev->layout;
3934 mddev->new_layout = n;
3935 if (mddev->reshape_position == MaxSector)
3938 mddev_unlock(mddev);
3941 static struct md_sysfs_entry md_layout =
3942 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3945 raid_disks_show(struct mddev *mddev, char *page)
3947 if (mddev->raid_disks == 0)
3949 if (mddev->reshape_position != MaxSector &&
3950 mddev->delta_disks != 0)
3951 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3952 mddev->raid_disks - mddev->delta_disks);
3953 return sprintf(page, "%d\n", mddev->raid_disks);
3956 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3959 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3964 err = kstrtouint(buf, 10, &n);
3968 err = mddev_lock(mddev);
3972 err = update_raid_disks(mddev, n);
3973 else if (mddev->reshape_position != MaxSector) {
3974 struct md_rdev *rdev;
3975 int olddisks = mddev->raid_disks - mddev->delta_disks;
3978 rdev_for_each(rdev, mddev) {
3980 rdev->data_offset < rdev->new_data_offset)
3983 rdev->data_offset > rdev->new_data_offset)
3987 mddev->delta_disks = n - olddisks;
3988 mddev->raid_disks = n;
3989 mddev->reshape_backwards = (mddev->delta_disks < 0);
3991 mddev->raid_disks = n;
3993 mddev_unlock(mddev);
3994 return err ? err : len;
3996 static struct md_sysfs_entry md_raid_disks =
3997 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4000 chunk_size_show(struct mddev *mddev, char *page)
4002 if (mddev->reshape_position != MaxSector &&
4003 mddev->chunk_sectors != mddev->new_chunk_sectors)
4004 return sprintf(page, "%d (%d)\n",
4005 mddev->new_chunk_sectors << 9,
4006 mddev->chunk_sectors << 9);
4007 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4011 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4016 err = kstrtoul(buf, 10, &n);
4020 err = mddev_lock(mddev);
4024 if (mddev->pers->check_reshape == NULL)
4029 mddev->new_chunk_sectors = n >> 9;
4030 err = mddev->pers->check_reshape(mddev);
4032 mddev->new_chunk_sectors = mddev->chunk_sectors;
4035 mddev->new_chunk_sectors = n >> 9;
4036 if (mddev->reshape_position == MaxSector)
4037 mddev->chunk_sectors = n >> 9;
4039 mddev_unlock(mddev);
4042 static struct md_sysfs_entry md_chunk_size =
4043 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4046 resync_start_show(struct mddev *mddev, char *page)
4048 if (mddev->recovery_cp == MaxSector)
4049 return sprintf(page, "none\n");
4050 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4054 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4056 unsigned long long n;
4059 if (cmd_match(buf, "none"))
4062 err = kstrtoull(buf, 10, &n);
4065 if (n != (sector_t)n)
4069 err = mddev_lock(mddev);
4072 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4076 mddev->recovery_cp = n;
4078 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4080 mddev_unlock(mddev);
4083 static struct md_sysfs_entry md_resync_start =
4084 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4085 resync_start_show, resync_start_store);
4088 * The array state can be:
4091 * No devices, no size, no level
4092 * Equivalent to STOP_ARRAY ioctl
4094 * May have some settings, but array is not active
4095 * all IO results in error
4096 * When written, doesn't tear down array, but just stops it
4097 * suspended (not supported yet)
4098 * All IO requests will block. The array can be reconfigured.
4099 * Writing this, if accepted, will block until array is quiescent
4101 * no resync can happen. no superblocks get written.
4102 * write requests fail
4104 * like readonly, but behaves like 'clean' on a write request.
4106 * clean - no pending writes, but otherwise active.
4107 * When written to inactive array, starts without resync
4108 * If a write request arrives then
4109 * if metadata is known, mark 'dirty' and switch to 'active'.
4110 * if not known, block and switch to write-pending
4111 * If written to an active array that has pending writes, then fails.
4113 * fully active: IO and resync can be happening.
4114 * When written to inactive array, starts with resync
4117 * clean, but writes are blocked waiting for 'active' to be written.
4120 * like active, but no writes have been seen for a while (100msec).
4123 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4124 write_pending, active_idle, bad_word};
4125 static char *array_states[] = {
4126 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4127 "write-pending", "active-idle", NULL };
4129 static int match_word(const char *word, char **list)
4132 for (n=0; list[n]; n++)
4133 if (cmd_match(word, list[n]))
4139 array_state_show(struct mddev *mddev, char *page)
4141 enum array_state st = inactive;
4143 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags))
4152 spin_lock(&mddev->lock);
4153 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4155 else if (mddev->in_sync)
4157 else if (mddev->safemode)
4161 spin_unlock(&mddev->lock);
4164 if (list_empty(&mddev->disks) &&
4165 mddev->raid_disks == 0 &&
4166 mddev->dev_sectors == 0)
4171 return sprintf(page, "%s\n", array_states[st]);
4174 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4175 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4176 static int do_md_run(struct mddev *mddev);
4177 static int restart_array(struct mddev *mddev);
4180 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4183 enum array_state st = match_word(buf, array_states);
4185 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4186 /* don't take reconfig_mutex when toggling between
4189 spin_lock(&mddev->lock);
4191 restart_array(mddev);
4192 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4193 md_wakeup_thread(mddev->thread);
4194 wake_up(&mddev->sb_wait);
4195 } else /* st == clean */ {
4196 restart_array(mddev);
4197 if (!set_in_sync(mddev))
4201 sysfs_notify_dirent_safe(mddev->sysfs_state);
4202 spin_unlock(&mddev->lock);
4205 err = mddev_lock(mddev);
4213 /* stopping an active array */
4214 err = do_md_stop(mddev, 0, NULL);
4217 /* stopping an active array */
4219 err = do_md_stop(mddev, 2, NULL);
4221 err = 0; /* already inactive */
4224 break; /* not supported yet */
4227 err = md_set_readonly(mddev, NULL);
4230 set_disk_ro(mddev->gendisk, 1);
4231 err = do_md_run(mddev);
4237 err = md_set_readonly(mddev, NULL);
4238 else if (mddev->ro == 1)
4239 err = restart_array(mddev);
4242 set_disk_ro(mddev->gendisk, 0);
4246 err = do_md_run(mddev);
4251 err = restart_array(mddev);
4254 spin_lock(&mddev->lock);
4255 if (!set_in_sync(mddev))
4257 spin_unlock(&mddev->lock);
4263 err = restart_array(mddev);
4266 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4267 wake_up(&mddev->sb_wait);
4271 set_disk_ro(mddev->gendisk, 0);
4272 err = do_md_run(mddev);
4277 /* these cannot be set */
4282 if (mddev->hold_active == UNTIL_IOCTL)
4283 mddev->hold_active = 0;
4284 sysfs_notify_dirent_safe(mddev->sysfs_state);
4286 mddev_unlock(mddev);
4289 static struct md_sysfs_entry md_array_state =
4290 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4293 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4294 return sprintf(page, "%d\n",
4295 atomic_read(&mddev->max_corr_read_errors));
4299 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4304 rv = kstrtouint(buf, 10, &n);
4307 atomic_set(&mddev->max_corr_read_errors, n);
4311 static struct md_sysfs_entry max_corr_read_errors =
4312 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4313 max_corrected_read_errors_store);
4316 null_show(struct mddev *mddev, char *page)
4322 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4324 /* buf must be %d:%d\n? giving major and minor numbers */
4325 /* The new device is added to the array.
4326 * If the array has a persistent superblock, we read the
4327 * superblock to initialise info and check validity.
4328 * Otherwise, only checking done is that in bind_rdev_to_array,
4329 * which mainly checks size.
4332 int major = simple_strtoul(buf, &e, 10);
4335 struct md_rdev *rdev;
4338 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4340 minor = simple_strtoul(e+1, &e, 10);
4341 if (*e && *e != '\n')
4343 dev = MKDEV(major, minor);
4344 if (major != MAJOR(dev) ||
4345 minor != MINOR(dev))
4348 flush_workqueue(md_misc_wq);
4350 err = mddev_lock(mddev);
4353 if (mddev->persistent) {
4354 rdev = md_import_device(dev, mddev->major_version,
4355 mddev->minor_version);
4356 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4357 struct md_rdev *rdev0
4358 = list_entry(mddev->disks.next,
4359 struct md_rdev, same_set);
4360 err = super_types[mddev->major_version]
4361 .load_super(rdev, rdev0, mddev->minor_version);
4365 } else if (mddev->external)
4366 rdev = md_import_device(dev, -2, -1);
4368 rdev = md_import_device(dev, -1, -1);
4371 mddev_unlock(mddev);
4372 return PTR_ERR(rdev);
4374 err = bind_rdev_to_array(rdev, mddev);
4378 mddev_unlock(mddev);
4380 md_new_event(mddev);
4381 return err ? err : len;
4384 static struct md_sysfs_entry md_new_device =
4385 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4388 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4391 unsigned long chunk, end_chunk;
4394 err = mddev_lock(mddev);
4399 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4401 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4402 if (buf == end) break;
4403 if (*end == '-') { /* range */
4405 end_chunk = simple_strtoul(buf, &end, 0);
4406 if (buf == end) break;
4408 if (*end && !isspace(*end)) break;
4409 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4410 buf = skip_spaces(end);
4412 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4414 mddev_unlock(mddev);
4418 static struct md_sysfs_entry md_bitmap =
4419 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4422 size_show(struct mddev *mddev, char *page)
4424 return sprintf(page, "%llu\n",
4425 (unsigned long long)mddev->dev_sectors / 2);
4428 static int update_size(struct mddev *mddev, sector_t num_sectors);
4431 size_store(struct mddev *mddev, const char *buf, size_t len)
4433 /* If array is inactive, we can reduce the component size, but
4434 * not increase it (except from 0).
4435 * If array is active, we can try an on-line resize
4438 int err = strict_blocks_to_sectors(buf, §ors);
4442 err = mddev_lock(mddev);
4446 err = update_size(mddev, sectors);
4448 md_update_sb(mddev, 1);
4450 if (mddev->dev_sectors == 0 ||
4451 mddev->dev_sectors > sectors)
4452 mddev->dev_sectors = sectors;
4456 mddev_unlock(mddev);
4457 return err ? err : len;
4460 static struct md_sysfs_entry md_size =
4461 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4463 /* Metadata version.
4465 * 'none' for arrays with no metadata (good luck...)
4466 * 'external' for arrays with externally managed metadata,
4467 * or N.M for internally known formats
4470 metadata_show(struct mddev *mddev, char *page)
4472 if (mddev->persistent)
4473 return sprintf(page, "%d.%d\n",
4474 mddev->major_version, mddev->minor_version);
4475 else if (mddev->external)
4476 return sprintf(page, "external:%s\n", mddev->metadata_type);
4478 return sprintf(page, "none\n");
4482 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4487 /* Changing the details of 'external' metadata is
4488 * always permitted. Otherwise there must be
4489 * no devices attached to the array.
4492 err = mddev_lock(mddev);
4496 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4498 else if (!list_empty(&mddev->disks))
4502 if (cmd_match(buf, "none")) {
4503 mddev->persistent = 0;
4504 mddev->external = 0;
4505 mddev->major_version = 0;
4506 mddev->minor_version = 90;
4509 if (strncmp(buf, "external:", 9) == 0) {
4510 size_t namelen = len-9;
4511 if (namelen >= sizeof(mddev->metadata_type))
4512 namelen = sizeof(mddev->metadata_type)-1;
4513 strncpy(mddev->metadata_type, buf+9, namelen);
4514 mddev->metadata_type[namelen] = 0;
4515 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4516 mddev->metadata_type[--namelen] = 0;
4517 mddev->persistent = 0;
4518 mddev->external = 1;
4519 mddev->major_version = 0;
4520 mddev->minor_version = 90;
4523 major = simple_strtoul(buf, &e, 10);
4525 if (e==buf || *e != '.')
4528 minor = simple_strtoul(buf, &e, 10);
4529 if (e==buf || (*e && *e != '\n') )
4532 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4534 mddev->major_version = major;
4535 mddev->minor_version = minor;
4536 mddev->persistent = 1;
4537 mddev->external = 0;
4540 mddev_unlock(mddev);
4544 static struct md_sysfs_entry md_metadata =
4545 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4548 action_show(struct mddev *mddev, char *page)
4550 char *type = "idle";
4551 unsigned long recovery = mddev->recovery;
4552 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4554 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4555 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4556 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4558 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4559 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4561 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4565 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4567 else if (mddev->reshape_position != MaxSector)
4570 return sprintf(page, "%s\n", type);
4574 action_store(struct mddev *mddev, const char *page, size_t len)
4576 if (!mddev->pers || !mddev->pers->sync_request)
4580 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4581 if (cmd_match(page, "frozen"))
4582 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4584 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4585 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4586 mddev_lock(mddev) == 0) {
4587 flush_workqueue(md_misc_wq);
4588 if (mddev->sync_thread) {
4589 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4590 md_reap_sync_thread(mddev);
4592 mddev_unlock(mddev);
4594 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4596 else if (cmd_match(page, "resync"))
4597 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4598 else if (cmd_match(page, "recover")) {
4599 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4600 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4601 } else if (cmd_match(page, "reshape")) {
4603 if (mddev->pers->start_reshape == NULL)
4605 err = mddev_lock(mddev);
4607 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4610 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4611 err = mddev->pers->start_reshape(mddev);
4613 mddev_unlock(mddev);
4617 sysfs_notify(&mddev->kobj, NULL, "degraded");
4619 if (cmd_match(page, "check"))
4620 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4621 else if (!cmd_match(page, "repair"))
4623 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4624 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4625 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4627 if (mddev->ro == 2) {
4628 /* A write to sync_action is enough to justify
4629 * canceling read-auto mode
4632 md_wakeup_thread(mddev->sync_thread);
4634 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4635 md_wakeup_thread(mddev->thread);
4636 sysfs_notify_dirent_safe(mddev->sysfs_action);
4640 static struct md_sysfs_entry md_scan_mode =
4641 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4644 last_sync_action_show(struct mddev *mddev, char *page)
4646 return sprintf(page, "%s\n", mddev->last_sync_action);
4649 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4652 mismatch_cnt_show(struct mddev *mddev, char *page)
4654 return sprintf(page, "%llu\n",
4655 (unsigned long long)
4656 atomic64_read(&mddev->resync_mismatches));
4659 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4662 sync_min_show(struct mddev *mddev, char *page)
4664 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4665 mddev->sync_speed_min ? "local": "system");
4669 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4674 if (strncmp(buf, "system", 6)==0) {
4677 rv = kstrtouint(buf, 10, &min);
4683 mddev->sync_speed_min = min;
4687 static struct md_sysfs_entry md_sync_min =
4688 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4691 sync_max_show(struct mddev *mddev, char *page)
4693 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4694 mddev->sync_speed_max ? "local": "system");
4698 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4703 if (strncmp(buf, "system", 6)==0) {
4706 rv = kstrtouint(buf, 10, &max);
4712 mddev->sync_speed_max = max;
4716 static struct md_sysfs_entry md_sync_max =
4717 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4720 degraded_show(struct mddev *mddev, char *page)
4722 return sprintf(page, "%d\n", mddev->degraded);
4724 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4727 sync_force_parallel_show(struct mddev *mddev, char *page)
4729 return sprintf(page, "%d\n", mddev->parallel_resync);
4733 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4737 if (kstrtol(buf, 10, &n))
4740 if (n != 0 && n != 1)
4743 mddev->parallel_resync = n;
4745 if (mddev->sync_thread)
4746 wake_up(&resync_wait);
4751 /* force parallel resync, even with shared block devices */
4752 static struct md_sysfs_entry md_sync_force_parallel =
4753 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4754 sync_force_parallel_show, sync_force_parallel_store);
4757 sync_speed_show(struct mddev *mddev, char *page)
4759 unsigned long resync, dt, db;
4760 if (mddev->curr_resync == 0)
4761 return sprintf(page, "none\n");
4762 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4763 dt = (jiffies - mddev->resync_mark) / HZ;
4765 db = resync - mddev->resync_mark_cnt;
4766 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4769 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4772 sync_completed_show(struct mddev *mddev, char *page)
4774 unsigned long long max_sectors, resync;
4776 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4777 return sprintf(page, "none\n");
4779 if (mddev->curr_resync == 1 ||
4780 mddev->curr_resync == 2)
4781 return sprintf(page, "delayed\n");
4783 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4784 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4785 max_sectors = mddev->resync_max_sectors;
4787 max_sectors = mddev->dev_sectors;
4789 resync = mddev->curr_resync_completed;
4790 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4793 static struct md_sysfs_entry md_sync_completed =
4794 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4797 min_sync_show(struct mddev *mddev, char *page)
4799 return sprintf(page, "%llu\n",
4800 (unsigned long long)mddev->resync_min);
4803 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4805 unsigned long long min;
4808 if (kstrtoull(buf, 10, &min))
4811 spin_lock(&mddev->lock);
4813 if (min > mddev->resync_max)
4817 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4820 /* Round down to multiple of 4K for safety */
4821 mddev->resync_min = round_down(min, 8);
4825 spin_unlock(&mddev->lock);
4829 static struct md_sysfs_entry md_min_sync =
4830 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4833 max_sync_show(struct mddev *mddev, char *page)
4835 if (mddev->resync_max == MaxSector)
4836 return sprintf(page, "max\n");
4838 return sprintf(page, "%llu\n",
4839 (unsigned long long)mddev->resync_max);
4842 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4845 spin_lock(&mddev->lock);
4846 if (strncmp(buf, "max", 3) == 0)
4847 mddev->resync_max = MaxSector;
4849 unsigned long long max;
4853 if (kstrtoull(buf, 10, &max))
4855 if (max < mddev->resync_min)
4859 if (max < mddev->resync_max &&
4861 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4864 /* Must be a multiple of chunk_size */
4865 chunk = mddev->chunk_sectors;
4867 sector_t temp = max;
4870 if (sector_div(temp, chunk))
4873 mddev->resync_max = max;
4875 wake_up(&mddev->recovery_wait);
4878 spin_unlock(&mddev->lock);
4882 static struct md_sysfs_entry md_max_sync =
4883 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4886 suspend_lo_show(struct mddev *mddev, char *page)
4888 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4892 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4894 unsigned long long new;
4897 err = kstrtoull(buf, 10, &new);
4900 if (new != (sector_t)new)
4903 err = mddev_lock(mddev);
4907 if (mddev->pers == NULL ||
4908 mddev->pers->quiesce == NULL)
4910 mddev_suspend(mddev);
4911 mddev->suspend_lo = new;
4912 mddev_resume(mddev);
4916 mddev_unlock(mddev);
4919 static struct md_sysfs_entry md_suspend_lo =
4920 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4923 suspend_hi_show(struct mddev *mddev, char *page)
4925 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4929 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4931 unsigned long long new;
4934 err = kstrtoull(buf, 10, &new);
4937 if (new != (sector_t)new)
4940 err = mddev_lock(mddev);
4944 if (mddev->pers == NULL)
4947 mddev_suspend(mddev);
4948 mddev->suspend_hi = new;
4949 mddev_resume(mddev);
4953 mddev_unlock(mddev);
4956 static struct md_sysfs_entry md_suspend_hi =
4957 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4960 reshape_position_show(struct mddev *mddev, char *page)
4962 if (mddev->reshape_position != MaxSector)
4963 return sprintf(page, "%llu\n",
4964 (unsigned long long)mddev->reshape_position);
4965 strcpy(page, "none\n");
4970 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4972 struct md_rdev *rdev;
4973 unsigned long long new;
4976 err = kstrtoull(buf, 10, &new);
4979 if (new != (sector_t)new)
4981 err = mddev_lock(mddev);
4987 mddev->reshape_position = new;
4988 mddev->delta_disks = 0;
4989 mddev->reshape_backwards = 0;
4990 mddev->new_level = mddev->level;
4991 mddev->new_layout = mddev->layout;
4992 mddev->new_chunk_sectors = mddev->chunk_sectors;
4993 rdev_for_each(rdev, mddev)
4994 rdev->new_data_offset = rdev->data_offset;
4997 mddev_unlock(mddev);
5001 static struct md_sysfs_entry md_reshape_position =
5002 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5003 reshape_position_store);
5006 reshape_direction_show(struct mddev *mddev, char *page)
5008 return sprintf(page, "%s\n",
5009 mddev->reshape_backwards ? "backwards" : "forwards");
5013 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5018 if (cmd_match(buf, "forwards"))
5020 else if (cmd_match(buf, "backwards"))
5024 if (mddev->reshape_backwards == backwards)
5027 err = mddev_lock(mddev);
5030 /* check if we are allowed to change */
5031 if (mddev->delta_disks)
5033 else if (mddev->persistent &&
5034 mddev->major_version == 0)
5037 mddev->reshape_backwards = backwards;
5038 mddev_unlock(mddev);
5042 static struct md_sysfs_entry md_reshape_direction =
5043 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5044 reshape_direction_store);
5047 array_size_show(struct mddev *mddev, char *page)
5049 if (mddev->external_size)
5050 return sprintf(page, "%llu\n",
5051 (unsigned long long)mddev->array_sectors/2);
5053 return sprintf(page, "default\n");
5057 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5062 err = mddev_lock(mddev);
5066 /* cluster raid doesn't support change array_sectors */
5067 if (mddev_is_clustered(mddev)) {
5068 mddev_unlock(mddev);
5072 if (strncmp(buf, "default", 7) == 0) {
5074 sectors = mddev->pers->size(mddev, 0, 0);
5076 sectors = mddev->array_sectors;
5078 mddev->external_size = 0;
5080 if (strict_blocks_to_sectors(buf, §ors) < 0)
5082 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5085 mddev->external_size = 1;
5089 mddev->array_sectors = sectors;
5091 set_capacity(mddev->gendisk, mddev->array_sectors);
5092 revalidate_disk(mddev->gendisk);
5095 mddev_unlock(mddev);
5099 static struct md_sysfs_entry md_array_size =
5100 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5104 consistency_policy_show(struct mddev *mddev, char *page)
5108 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5109 ret = sprintf(page, "journal\n");
5110 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5111 ret = sprintf(page, "ppl\n");
5112 } else if (mddev->bitmap) {
5113 ret = sprintf(page, "bitmap\n");
5114 } else if (mddev->pers) {
5115 if (mddev->pers->sync_request)
5116 ret = sprintf(page, "resync\n");
5118 ret = sprintf(page, "none\n");
5120 ret = sprintf(page, "unknown\n");
5127 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5132 if (mddev->pers->change_consistency_policy)
5133 err = mddev->pers->change_consistency_policy(mddev, buf);
5136 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5137 set_bit(MD_HAS_PPL, &mddev->flags);
5142 return err ? err : len;
5145 static struct md_sysfs_entry md_consistency_policy =
5146 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5147 consistency_policy_store);
5149 static struct attribute *md_default_attrs[] = {
5152 &md_raid_disks.attr,
5153 &md_chunk_size.attr,
5155 &md_resync_start.attr,
5157 &md_new_device.attr,
5158 &md_safe_delay.attr,
5159 &md_array_state.attr,
5160 &md_reshape_position.attr,
5161 &md_reshape_direction.attr,
5162 &md_array_size.attr,
5163 &max_corr_read_errors.attr,
5164 &md_consistency_policy.attr,
5168 static struct attribute *md_redundancy_attrs[] = {
5170 &md_last_scan_mode.attr,
5171 &md_mismatches.attr,
5174 &md_sync_speed.attr,
5175 &md_sync_force_parallel.attr,
5176 &md_sync_completed.attr,
5179 &md_suspend_lo.attr,
5180 &md_suspend_hi.attr,
5185 static struct attribute_group md_redundancy_group = {
5187 .attrs = md_redundancy_attrs,
5191 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5193 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5194 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5199 spin_lock(&all_mddevs_lock);
5200 if (list_empty(&mddev->all_mddevs)) {
5201 spin_unlock(&all_mddevs_lock);
5205 spin_unlock(&all_mddevs_lock);
5207 rv = entry->show(mddev, page);
5213 md_attr_store(struct kobject *kobj, struct attribute *attr,
5214 const char *page, size_t length)
5216 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5217 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5222 if (!capable(CAP_SYS_ADMIN))
5224 spin_lock(&all_mddevs_lock);
5225 if (list_empty(&mddev->all_mddevs)) {
5226 spin_unlock(&all_mddevs_lock);
5230 spin_unlock(&all_mddevs_lock);
5231 rv = entry->store(mddev, page, length);
5236 static void md_free(struct kobject *ko)
5238 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5240 if (mddev->sysfs_state)
5241 sysfs_put(mddev->sysfs_state);
5244 blk_cleanup_queue(mddev->queue);
5245 if (mddev->gendisk) {
5246 del_gendisk(mddev->gendisk);
5247 put_disk(mddev->gendisk);
5249 percpu_ref_exit(&mddev->writes_pending);
5254 static const struct sysfs_ops md_sysfs_ops = {
5255 .show = md_attr_show,
5256 .store = md_attr_store,
5258 static struct kobj_type md_ktype = {
5260 .sysfs_ops = &md_sysfs_ops,
5261 .default_attrs = md_default_attrs,
5266 static void mddev_delayed_delete(struct work_struct *ws)
5268 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5270 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5271 kobject_del(&mddev->kobj);
5272 kobject_put(&mddev->kobj);
5275 static void no_op(struct percpu_ref *r) {}
5277 int mddev_init_writes_pending(struct mddev *mddev)
5279 if (mddev->writes_pending.percpu_count_ptr)
5281 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5283 /* We want to start with the refcount at zero */
5284 percpu_ref_put(&mddev->writes_pending);
5287 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5289 static int md_alloc(dev_t dev, char *name)
5292 * If dev is zero, name is the name of a device to allocate with
5293 * an arbitrary minor number. It will be "md_???"
5294 * If dev is non-zero it must be a device number with a MAJOR of
5295 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5296 * the device is being created by opening a node in /dev.
5297 * If "name" is not NULL, the device is being created by
5298 * writing to /sys/module/md_mod/parameters/new_array.
5300 static DEFINE_MUTEX(disks_mutex);
5301 struct mddev *mddev = mddev_find_or_alloc(dev);
5302 struct gendisk *disk;
5311 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5312 shift = partitioned ? MdpMinorShift : 0;
5313 unit = MINOR(mddev->unit) >> shift;
5315 /* wait for any previous instance of this device to be
5316 * completely removed (mddev_delayed_delete).
5318 flush_workqueue(md_misc_wq);
5320 mutex_lock(&disks_mutex);
5326 /* Need to ensure that 'name' is not a duplicate.
5328 struct mddev *mddev2;
5329 spin_lock(&all_mddevs_lock);
5331 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5332 if (mddev2->gendisk &&
5333 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5334 spin_unlock(&all_mddevs_lock);
5337 spin_unlock(&all_mddevs_lock);
5341 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5343 mddev->hold_active = UNTIL_STOP;
5346 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5349 mddev->queue->queuedata = mddev;
5351 blk_queue_make_request(mddev->queue, md_make_request);
5352 blk_set_stacking_limits(&mddev->queue->limits);
5354 disk = alloc_disk(1 << shift);
5356 blk_cleanup_queue(mddev->queue);
5357 mddev->queue = NULL;
5360 disk->major = MAJOR(mddev->unit);
5361 disk->first_minor = unit << shift;
5363 strcpy(disk->disk_name, name);
5364 else if (partitioned)
5365 sprintf(disk->disk_name, "md_d%d", unit);
5367 sprintf(disk->disk_name, "md%d", unit);
5368 disk->fops = &md_fops;
5369 disk->private_data = mddev;
5370 disk->queue = mddev->queue;
5371 blk_queue_write_cache(mddev->queue, true, true);
5372 /* Allow extended partitions. This makes the
5373 * 'mdp' device redundant, but we can't really
5376 disk->flags |= GENHD_FL_EXT_DEVT;
5377 mddev->gendisk = disk;
5380 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5381 &disk_to_dev(disk)->kobj, "%s", "md");
5383 /* This isn't possible, but as kobject_init_and_add is marked
5384 * __must_check, we must do something with the result
5386 pr_debug("md: cannot register %s/md - name in use\n",
5390 if (mddev->kobj.sd &&
5391 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5392 pr_debug("pointless warning\n");
5394 mutex_unlock(&disks_mutex);
5395 if (!error && mddev->kobj.sd) {
5396 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5397 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5403 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5406 md_alloc(dev, NULL);
5410 static int add_named_array(const char *val, struct kernel_param *kp)
5413 * val must be "md_*" or "mdNNN".
5414 * For "md_*" we allocate an array with a large free minor number, and
5415 * set the name to val. val must not already be an active name.
5416 * For "mdNNN" we allocate an array with the minor number NNN
5417 * which must not already be in use.
5419 int len = strlen(val);
5420 char buf[DISK_NAME_LEN];
5421 unsigned long devnum;
5423 while (len && val[len-1] == '\n')
5425 if (len >= DISK_NAME_LEN)
5427 strlcpy(buf, val, len+1);
5428 if (strncmp(buf, "md_", 3) == 0)
5429 return md_alloc(0, buf);
5430 if (strncmp(buf, "md", 2) == 0 &&
5432 kstrtoul(buf+2, 10, &devnum) == 0 &&
5433 devnum <= MINORMASK)
5434 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5439 static void md_safemode_timeout(unsigned long data)
5441 struct mddev *mddev = (struct mddev *) data;
5443 mddev->safemode = 1;
5444 if (mddev->external)
5445 sysfs_notify_dirent_safe(mddev->sysfs_state);
5447 md_wakeup_thread(mddev->thread);
5450 static int start_dirty_degraded;
5452 int md_run(struct mddev *mddev)
5455 struct md_rdev *rdev;
5456 struct md_personality *pers;
5458 if (list_empty(&mddev->disks))
5459 /* cannot run an array with no devices.. */
5464 /* Cannot run until previous stop completes properly */
5465 if (mddev->sysfs_active)
5469 * Analyze all RAID superblock(s)
5471 if (!mddev->raid_disks) {
5472 if (!mddev->persistent)
5477 if (mddev->level != LEVEL_NONE)
5478 request_module("md-level-%d", mddev->level);
5479 else if (mddev->clevel[0])
5480 request_module("md-%s", mddev->clevel);
5483 * Drop all container device buffers, from now on
5484 * the only valid external interface is through the md
5487 mddev->has_superblocks = false;
5488 rdev_for_each(rdev, mddev) {
5489 if (test_bit(Faulty, &rdev->flags))
5491 sync_blockdev(rdev->bdev);
5492 invalidate_bdev(rdev->bdev);
5493 if (mddev->ro != 1 &&
5494 (bdev_read_only(rdev->bdev) ||
5495 bdev_read_only(rdev->meta_bdev))) {
5498 set_disk_ro(mddev->gendisk, 1);
5502 mddev->has_superblocks = true;
5504 /* perform some consistency tests on the device.
5505 * We don't want the data to overlap the metadata,
5506 * Internal Bitmap issues have been handled elsewhere.
5508 if (rdev->meta_bdev) {
5509 /* Nothing to check */;
5510 } else if (rdev->data_offset < rdev->sb_start) {
5511 if (mddev->dev_sectors &&
5512 rdev->data_offset + mddev->dev_sectors
5514 pr_warn("md: %s: data overlaps metadata\n",
5519 if (rdev->sb_start + rdev->sb_size/512
5520 > rdev->data_offset) {
5521 pr_warn("md: %s: metadata overlaps data\n",
5526 sysfs_notify_dirent_safe(rdev->sysfs_state);
5529 if (mddev->bio_set == NULL) {
5530 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5531 if (!mddev->bio_set)
5534 if (mddev->sync_set == NULL) {
5535 mddev->sync_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5536 if (!mddev->sync_set) {
5542 spin_lock(&pers_lock);
5543 pers = find_pers(mddev->level, mddev->clevel);
5544 if (!pers || !try_module_get(pers->owner)) {
5545 spin_unlock(&pers_lock);
5546 if (mddev->level != LEVEL_NONE)
5547 pr_warn("md: personality for level %d is not loaded!\n",
5550 pr_warn("md: personality for level %s is not loaded!\n",
5555 spin_unlock(&pers_lock);
5556 if (mddev->level != pers->level) {
5557 mddev->level = pers->level;
5558 mddev->new_level = pers->level;
5560 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5562 if (mddev->reshape_position != MaxSector &&
5563 pers->start_reshape == NULL) {
5564 /* This personality cannot handle reshaping... */
5565 module_put(pers->owner);
5570 if (pers->sync_request) {
5571 /* Warn if this is a potentially silly
5574 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5575 struct md_rdev *rdev2;
5578 rdev_for_each(rdev, mddev)
5579 rdev_for_each(rdev2, mddev) {
5581 rdev->bdev->bd_contains ==
5582 rdev2->bdev->bd_contains) {
5583 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5585 bdevname(rdev->bdev,b),
5586 bdevname(rdev2->bdev,b2));
5592 pr_warn("True protection against single-disk failure might be compromised.\n");
5595 mddev->recovery = 0;
5596 /* may be over-ridden by personality */
5597 mddev->resync_max_sectors = mddev->dev_sectors;
5599 mddev->ok_start_degraded = start_dirty_degraded;
5601 if (start_readonly && mddev->ro == 0)
5602 mddev->ro = 2; /* read-only, but switch on first write */
5605 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5606 * up mddev->thread. It is important to initialize critical
5607 * resources for mddev->thread BEFORE calling pers->run().
5609 err = pers->run(mddev);
5611 pr_warn("md: pers->run() failed ...\n");
5612 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5613 WARN_ONCE(!mddev->external_size,
5614 "%s: default size too small, but 'external_size' not in effect?\n",
5616 pr_warn("md: invalid array_size %llu > default size %llu\n",
5617 (unsigned long long)mddev->array_sectors / 2,
5618 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5621 if (err == 0 && pers->sync_request &&
5622 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5623 struct bitmap *bitmap;
5625 bitmap = bitmap_create(mddev, -1);
5626 if (IS_ERR(bitmap)) {
5627 err = PTR_ERR(bitmap);
5628 pr_warn("%s: failed to create bitmap (%d)\n",
5629 mdname(mddev), err);
5631 mddev->bitmap = bitmap;
5635 mddev_detach(mddev);
5637 pers->free(mddev, mddev->private);
5638 mddev->private = NULL;
5639 module_put(pers->owner);
5640 bitmap_destroy(mddev);
5646 rdev_for_each(rdev, mddev) {
5647 if (rdev->raid_disk >= 0 &&
5648 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5653 if (mddev->degraded)
5656 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5658 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5659 mddev->queue->backing_dev_info->congested_data = mddev;
5660 mddev->queue->backing_dev_info->congested_fn = md_congested;
5662 if (pers->sync_request) {
5663 if (mddev->kobj.sd &&
5664 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5665 pr_warn("md: cannot register extra attributes for %s\n",
5667 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5668 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5671 atomic_set(&mddev->max_corr_read_errors,
5672 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5673 mddev->safemode = 0;
5674 if (mddev_is_clustered(mddev))
5675 mddev->safemode_delay = 0;
5677 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5680 spin_lock(&mddev->lock);
5682 spin_unlock(&mddev->lock);
5683 rdev_for_each(rdev, mddev)
5684 if (rdev->raid_disk >= 0)
5685 if (sysfs_link_rdev(mddev, rdev))
5686 /* failure here is OK */;
5688 if (mddev->degraded && !mddev->ro)
5689 /* This ensures that recovering status is reported immediately
5690 * via sysfs - until a lack of spares is confirmed.
5692 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5693 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5695 if (mddev->sb_flags)
5696 md_update_sb(mddev, 0);
5698 md_new_event(mddev);
5702 if (mddev->bio_set) {
5703 bioset_free(mddev->bio_set);
5704 mddev->bio_set = NULL;
5706 if (mddev->sync_set) {
5707 bioset_free(mddev->sync_set);
5708 mddev->sync_set = NULL;
5713 EXPORT_SYMBOL_GPL(md_run);
5715 static int do_md_run(struct mddev *mddev)
5719 set_bit(MD_NOT_READY, &mddev->flags);
5720 err = md_run(mddev);
5723 err = bitmap_load(mddev);
5725 bitmap_destroy(mddev);
5729 if (mddev_is_clustered(mddev))
5730 md_allow_write(mddev);
5732 md_wakeup_thread(mddev->thread);
5733 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5735 set_capacity(mddev->gendisk, mddev->array_sectors);
5736 revalidate_disk(mddev->gendisk);
5737 clear_bit(MD_NOT_READY, &mddev->flags);
5739 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5740 sysfs_notify_dirent_safe(mddev->sysfs_state);
5741 sysfs_notify_dirent_safe(mddev->sysfs_action);
5742 sysfs_notify(&mddev->kobj, NULL, "degraded");
5744 clear_bit(MD_NOT_READY, &mddev->flags);
5748 static int restart_array(struct mddev *mddev)
5750 struct gendisk *disk = mddev->gendisk;
5751 struct md_rdev *rdev;
5752 bool has_journal = false;
5753 bool has_readonly = false;
5755 /* Complain if it has no devices */
5756 if (list_empty(&mddev->disks))
5764 rdev_for_each_rcu(rdev, mddev) {
5765 if (test_bit(Journal, &rdev->flags) &&
5766 !test_bit(Faulty, &rdev->flags))
5768 if (bdev_read_only(rdev->bdev))
5769 has_readonly = true;
5772 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5773 /* Don't restart rw with journal missing/faulty */
5778 mddev->safemode = 0;
5780 set_disk_ro(disk, 0);
5781 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5782 /* Kick recovery or resync if necessary */
5783 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5784 md_wakeup_thread(mddev->thread);
5785 md_wakeup_thread(mddev->sync_thread);
5786 sysfs_notify_dirent_safe(mddev->sysfs_state);
5790 static void md_clean(struct mddev *mddev)
5792 mddev->array_sectors = 0;
5793 mddev->external_size = 0;
5794 mddev->dev_sectors = 0;
5795 mddev->raid_disks = 0;
5796 mddev->recovery_cp = 0;
5797 mddev->resync_min = 0;
5798 mddev->resync_max = MaxSector;
5799 mddev->reshape_position = MaxSector;
5800 mddev->external = 0;
5801 mddev->persistent = 0;
5802 mddev->level = LEVEL_NONE;
5803 mddev->clevel[0] = 0;
5805 mddev->sb_flags = 0;
5807 mddev->metadata_type[0] = 0;
5808 mddev->chunk_sectors = 0;
5809 mddev->ctime = mddev->utime = 0;
5811 mddev->max_disks = 0;
5813 mddev->can_decrease_events = 0;
5814 mddev->delta_disks = 0;
5815 mddev->reshape_backwards = 0;
5816 mddev->new_level = LEVEL_NONE;
5817 mddev->new_layout = 0;
5818 mddev->new_chunk_sectors = 0;
5819 mddev->curr_resync = 0;
5820 atomic64_set(&mddev->resync_mismatches, 0);
5821 mddev->suspend_lo = mddev->suspend_hi = 0;
5822 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5823 mddev->recovery = 0;
5826 mddev->degraded = 0;
5827 mddev->safemode = 0;
5828 mddev->private = NULL;
5829 mddev->cluster_info = NULL;
5830 mddev->bitmap_info.offset = 0;
5831 mddev->bitmap_info.default_offset = 0;
5832 mddev->bitmap_info.default_space = 0;
5833 mddev->bitmap_info.chunksize = 0;
5834 mddev->bitmap_info.daemon_sleep = 0;
5835 mddev->bitmap_info.max_write_behind = 0;
5836 mddev->bitmap_info.nodes = 0;
5839 static void __md_stop_writes(struct mddev *mddev)
5841 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5842 flush_workqueue(md_misc_wq);
5843 if (mddev->sync_thread) {
5844 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5845 md_reap_sync_thread(mddev);
5848 del_timer_sync(&mddev->safemode_timer);
5850 if (mddev->pers && mddev->pers->quiesce) {
5851 mddev->pers->quiesce(mddev, 1);
5852 mddev->pers->quiesce(mddev, 0);
5854 bitmap_flush(mddev);
5856 if (mddev->ro == 0 &&
5857 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5859 /* mark array as shutdown cleanly */
5860 if (!mddev_is_clustered(mddev))
5862 md_update_sb(mddev, 1);
5866 void md_stop_writes(struct mddev *mddev)
5868 mddev_lock_nointr(mddev);
5869 __md_stop_writes(mddev);
5870 mddev_unlock(mddev);
5872 EXPORT_SYMBOL_GPL(md_stop_writes);
5874 static void mddev_detach(struct mddev *mddev)
5876 bitmap_wait_behind_writes(mddev);
5877 if (mddev->pers && mddev->pers->quiesce) {
5878 mddev->pers->quiesce(mddev, 1);
5879 mddev->pers->quiesce(mddev, 0);
5881 md_unregister_thread(&mddev->thread);
5883 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5886 static void __md_stop(struct mddev *mddev)
5888 struct md_personality *pers = mddev->pers;
5889 bitmap_destroy(mddev);
5890 mddev_detach(mddev);
5891 /* Ensure ->event_work is done */
5892 flush_workqueue(md_misc_wq);
5893 spin_lock(&mddev->lock);
5895 spin_unlock(&mddev->lock);
5896 pers->free(mddev, mddev->private);
5897 mddev->private = NULL;
5898 if (pers->sync_request && mddev->to_remove == NULL)
5899 mddev->to_remove = &md_redundancy_group;
5900 module_put(pers->owner);
5901 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5904 void md_stop(struct mddev *mddev)
5906 /* stop the array and free an attached data structures.
5907 * This is called from dm-raid
5911 bioset_free(mddev->bio_set);
5914 EXPORT_SYMBOL_GPL(md_stop);
5916 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5921 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5923 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5924 md_wakeup_thread(mddev->thread);
5926 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5927 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5928 if (mddev->sync_thread)
5929 /* Thread might be blocked waiting for metadata update
5930 * which will now never happen */
5931 wake_up_process(mddev->sync_thread->tsk);
5933 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5935 mddev_unlock(mddev);
5936 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5938 wait_event(mddev->sb_wait,
5939 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5940 mddev_lock_nointr(mddev);
5942 mutex_lock(&mddev->open_mutex);
5943 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5944 mddev->sync_thread ||
5945 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5946 pr_warn("md: %s still in use.\n",mdname(mddev));
5948 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5949 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5950 md_wakeup_thread(mddev->thread);
5956 __md_stop_writes(mddev);
5962 set_disk_ro(mddev->gendisk, 1);
5963 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5964 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5965 md_wakeup_thread(mddev->thread);
5966 sysfs_notify_dirent_safe(mddev->sysfs_state);
5970 mutex_unlock(&mddev->open_mutex);
5975 * 0 - completely stop and dis-assemble array
5976 * 2 - stop but do not disassemble array
5978 static int do_md_stop(struct mddev *mddev, int mode,
5979 struct block_device *bdev)
5981 struct gendisk *disk = mddev->gendisk;
5982 struct md_rdev *rdev;
5985 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5987 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5988 md_wakeup_thread(mddev->thread);
5990 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5991 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5992 if (mddev->sync_thread)
5993 /* Thread might be blocked waiting for metadata update
5994 * which will now never happen */
5995 wake_up_process(mddev->sync_thread->tsk);
5997 mddev_unlock(mddev);
5998 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5999 !test_bit(MD_RECOVERY_RUNNING,
6000 &mddev->recovery)));
6001 mddev_lock_nointr(mddev);
6003 mutex_lock(&mddev->open_mutex);
6004 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6005 mddev->sysfs_active ||
6006 mddev->sync_thread ||
6007 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6008 pr_warn("md: %s still in use.\n",mdname(mddev));
6009 mutex_unlock(&mddev->open_mutex);
6011 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6012 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6013 md_wakeup_thread(mddev->thread);
6019 set_disk_ro(disk, 0);
6021 __md_stop_writes(mddev);
6023 mddev->queue->backing_dev_info->congested_fn = NULL;
6025 /* tell userspace to handle 'inactive' */
6026 sysfs_notify_dirent_safe(mddev->sysfs_state);
6028 rdev_for_each(rdev, mddev)
6029 if (rdev->raid_disk >= 0)
6030 sysfs_unlink_rdev(mddev, rdev);
6032 set_capacity(disk, 0);
6033 mutex_unlock(&mddev->open_mutex);
6035 revalidate_disk(disk);
6040 mutex_unlock(&mddev->open_mutex);
6042 * Free resources if final stop
6045 pr_info("md: %s stopped.\n", mdname(mddev));
6047 if (mddev->bitmap_info.file) {
6048 struct file *f = mddev->bitmap_info.file;
6049 spin_lock(&mddev->lock);
6050 mddev->bitmap_info.file = NULL;
6051 spin_unlock(&mddev->lock);
6054 mddev->bitmap_info.offset = 0;
6056 export_array(mddev);
6059 if (mddev->hold_active == UNTIL_STOP)
6060 mddev->hold_active = 0;
6062 md_new_event(mddev);
6063 sysfs_notify_dirent_safe(mddev->sysfs_state);
6068 static void autorun_array(struct mddev *mddev)
6070 struct md_rdev *rdev;
6073 if (list_empty(&mddev->disks))
6076 pr_info("md: running: ");
6078 rdev_for_each(rdev, mddev) {
6079 char b[BDEVNAME_SIZE];
6080 pr_cont("<%s>", bdevname(rdev->bdev,b));
6084 err = do_md_run(mddev);
6086 pr_warn("md: do_md_run() returned %d\n", err);
6087 do_md_stop(mddev, 0, NULL);
6092 * lets try to run arrays based on all disks that have arrived
6093 * until now. (those are in pending_raid_disks)
6095 * the method: pick the first pending disk, collect all disks with
6096 * the same UUID, remove all from the pending list and put them into
6097 * the 'same_array' list. Then order this list based on superblock
6098 * update time (freshest comes first), kick out 'old' disks and
6099 * compare superblocks. If everything's fine then run it.
6101 * If "unit" is allocated, then bump its reference count
6103 static void autorun_devices(int part)
6105 struct md_rdev *rdev0, *rdev, *tmp;
6106 struct mddev *mddev;
6107 char b[BDEVNAME_SIZE];
6109 pr_info("md: autorun ...\n");
6110 while (!list_empty(&pending_raid_disks)) {
6113 LIST_HEAD(candidates);
6114 rdev0 = list_entry(pending_raid_disks.next,
6115 struct md_rdev, same_set);
6117 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6118 INIT_LIST_HEAD(&candidates);
6119 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6120 if (super_90_load(rdev, rdev0, 0) >= 0) {
6121 pr_debug("md: adding %s ...\n",
6122 bdevname(rdev->bdev,b));
6123 list_move(&rdev->same_set, &candidates);
6126 * now we have a set of devices, with all of them having
6127 * mostly sane superblocks. It's time to allocate the
6131 dev = MKDEV(mdp_major,
6132 rdev0->preferred_minor << MdpMinorShift);
6133 unit = MINOR(dev) >> MdpMinorShift;
6135 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6138 if (rdev0->preferred_minor != unit) {
6139 pr_warn("md: unit number in %s is bad: %d\n",
6140 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6144 md_probe(dev, NULL, NULL);
6145 mddev = mddev_find(dev);
6149 if (mddev_lock(mddev))
6150 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6151 else if (mddev->raid_disks || mddev->major_version
6152 || !list_empty(&mddev->disks)) {
6153 pr_warn("md: %s already running, cannot run %s\n",
6154 mdname(mddev), bdevname(rdev0->bdev,b));
6155 mddev_unlock(mddev);
6157 pr_debug("md: created %s\n", mdname(mddev));
6158 mddev->persistent = 1;
6159 rdev_for_each_list(rdev, tmp, &candidates) {
6160 list_del_init(&rdev->same_set);
6161 if (bind_rdev_to_array(rdev, mddev))
6164 autorun_array(mddev);
6165 mddev_unlock(mddev);
6167 /* on success, candidates will be empty, on error
6170 rdev_for_each_list(rdev, tmp, &candidates) {
6171 list_del_init(&rdev->same_set);
6176 pr_info("md: ... autorun DONE.\n");
6178 #endif /* !MODULE */
6180 static int get_version(void __user *arg)
6184 ver.major = MD_MAJOR_VERSION;
6185 ver.minor = MD_MINOR_VERSION;
6186 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6188 if (copy_to_user(arg, &ver, sizeof(ver)))
6194 static int get_array_info(struct mddev *mddev, void __user *arg)
6196 mdu_array_info_t info;
6197 int nr,working,insync,failed,spare;
6198 struct md_rdev *rdev;
6200 nr = working = insync = failed = spare = 0;
6202 rdev_for_each_rcu(rdev, mddev) {
6204 if (test_bit(Faulty, &rdev->flags))
6208 if (test_bit(In_sync, &rdev->flags))
6210 else if (test_bit(Journal, &rdev->flags))
6211 /* TODO: add journal count to md_u.h */
6219 info.major_version = mddev->major_version;
6220 info.minor_version = mddev->minor_version;
6221 info.patch_version = MD_PATCHLEVEL_VERSION;
6222 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6223 info.level = mddev->level;
6224 info.size = mddev->dev_sectors / 2;
6225 if (info.size != mddev->dev_sectors / 2) /* overflow */
6228 info.raid_disks = mddev->raid_disks;
6229 info.md_minor = mddev->md_minor;
6230 info.not_persistent= !mddev->persistent;
6232 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6235 info.state = (1<<MD_SB_CLEAN);
6236 if (mddev->bitmap && mddev->bitmap_info.offset)
6237 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6238 if (mddev_is_clustered(mddev))
6239 info.state |= (1<<MD_SB_CLUSTERED);
6240 info.active_disks = insync;
6241 info.working_disks = working;
6242 info.failed_disks = failed;
6243 info.spare_disks = spare;
6245 info.layout = mddev->layout;
6246 info.chunk_size = mddev->chunk_sectors << 9;
6248 if (copy_to_user(arg, &info, sizeof(info)))
6254 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6256 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6260 file = kzalloc(sizeof(*file), GFP_NOIO);
6265 spin_lock(&mddev->lock);
6266 /* bitmap enabled */
6267 if (mddev->bitmap_info.file) {
6268 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6269 sizeof(file->pathname));
6273 memmove(file->pathname, ptr,
6274 sizeof(file->pathname)-(ptr-file->pathname));
6276 spin_unlock(&mddev->lock);
6279 copy_to_user(arg, file, sizeof(*file)))
6286 static int get_disk_info(struct mddev *mddev, void __user * arg)
6288 mdu_disk_info_t info;
6289 struct md_rdev *rdev;
6291 if (copy_from_user(&info, arg, sizeof(info)))
6295 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6297 info.major = MAJOR(rdev->bdev->bd_dev);
6298 info.minor = MINOR(rdev->bdev->bd_dev);
6299 info.raid_disk = rdev->raid_disk;
6301 if (test_bit(Faulty, &rdev->flags))
6302 info.state |= (1<<MD_DISK_FAULTY);
6303 else if (test_bit(In_sync, &rdev->flags)) {
6304 info.state |= (1<<MD_DISK_ACTIVE);
6305 info.state |= (1<<MD_DISK_SYNC);
6307 if (test_bit(Journal, &rdev->flags))
6308 info.state |= (1<<MD_DISK_JOURNAL);
6309 if (test_bit(WriteMostly, &rdev->flags))
6310 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6311 if (test_bit(FailFast, &rdev->flags))
6312 info.state |= (1<<MD_DISK_FAILFAST);
6314 info.major = info.minor = 0;
6315 info.raid_disk = -1;
6316 info.state = (1<<MD_DISK_REMOVED);
6320 if (copy_to_user(arg, &info, sizeof(info)))
6326 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6328 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6329 struct md_rdev *rdev;
6330 dev_t dev = MKDEV(info->major,info->minor);
6332 if (mddev_is_clustered(mddev) &&
6333 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6334 pr_warn("%s: Cannot add to clustered mddev.\n",
6339 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6342 if (!mddev->raid_disks) {
6344 /* expecting a device which has a superblock */
6345 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6347 pr_warn("md: md_import_device returned %ld\n",
6349 return PTR_ERR(rdev);
6351 if (!list_empty(&mddev->disks)) {
6352 struct md_rdev *rdev0
6353 = list_entry(mddev->disks.next,
6354 struct md_rdev, same_set);
6355 err = super_types[mddev->major_version]
6356 .load_super(rdev, rdev0, mddev->minor_version);
6358 pr_warn("md: %s has different UUID to %s\n",
6359 bdevname(rdev->bdev,b),
6360 bdevname(rdev0->bdev,b2));
6365 err = bind_rdev_to_array(rdev, mddev);
6372 * add_new_disk can be used once the array is assembled
6373 * to add "hot spares". They must already have a superblock
6378 if (!mddev->pers->hot_add_disk) {
6379 pr_warn("%s: personality does not support diskops!\n",
6383 if (mddev->persistent)
6384 rdev = md_import_device(dev, mddev->major_version,
6385 mddev->minor_version);
6387 rdev = md_import_device(dev, -1, -1);
6389 pr_warn("md: md_import_device returned %ld\n",
6391 return PTR_ERR(rdev);
6393 /* set saved_raid_disk if appropriate */
6394 if (!mddev->persistent) {
6395 if (info->state & (1<<MD_DISK_SYNC) &&
6396 info->raid_disk < mddev->raid_disks) {
6397 rdev->raid_disk = info->raid_disk;
6398 set_bit(In_sync, &rdev->flags);
6399 clear_bit(Bitmap_sync, &rdev->flags);
6401 rdev->raid_disk = -1;
6402 rdev->saved_raid_disk = rdev->raid_disk;
6404 super_types[mddev->major_version].
6405 validate_super(mddev, rdev);
6406 if ((info->state & (1<<MD_DISK_SYNC)) &&
6407 rdev->raid_disk != info->raid_disk) {
6408 /* This was a hot-add request, but events doesn't
6409 * match, so reject it.
6415 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6416 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6417 set_bit(WriteMostly, &rdev->flags);
6419 clear_bit(WriteMostly, &rdev->flags);
6420 if (info->state & (1<<MD_DISK_FAILFAST))
6421 set_bit(FailFast, &rdev->flags);
6423 clear_bit(FailFast, &rdev->flags);
6425 if (info->state & (1<<MD_DISK_JOURNAL)) {
6426 struct md_rdev *rdev2;
6427 bool has_journal = false;
6429 /* make sure no existing journal disk */
6430 rdev_for_each(rdev2, mddev) {
6431 if (test_bit(Journal, &rdev2->flags)) {
6436 if (has_journal || mddev->bitmap) {
6440 set_bit(Journal, &rdev->flags);
6443 * check whether the device shows up in other nodes
6445 if (mddev_is_clustered(mddev)) {
6446 if (info->state & (1 << MD_DISK_CANDIDATE))
6447 set_bit(Candidate, &rdev->flags);
6448 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6449 /* --add initiated by this node */
6450 err = md_cluster_ops->add_new_disk(mddev, rdev);
6458 rdev->raid_disk = -1;
6459 err = bind_rdev_to_array(rdev, mddev);
6464 if (mddev_is_clustered(mddev)) {
6465 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6467 err = md_cluster_ops->new_disk_ack(mddev,
6470 md_kick_rdev_from_array(rdev);
6474 md_cluster_ops->add_new_disk_cancel(mddev);
6476 err = add_bound_rdev(rdev);
6480 err = add_bound_rdev(rdev);
6485 /* otherwise, add_new_disk is only allowed
6486 * for major_version==0 superblocks
6488 if (mddev->major_version != 0) {
6489 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6493 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6495 rdev = md_import_device(dev, -1, 0);
6497 pr_warn("md: error, md_import_device() returned %ld\n",
6499 return PTR_ERR(rdev);
6501 rdev->desc_nr = info->number;
6502 if (info->raid_disk < mddev->raid_disks)
6503 rdev->raid_disk = info->raid_disk;
6505 rdev->raid_disk = -1;
6507 if (rdev->raid_disk < mddev->raid_disks)
6508 if (info->state & (1<<MD_DISK_SYNC))
6509 set_bit(In_sync, &rdev->flags);
6511 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6512 set_bit(WriteMostly, &rdev->flags);
6513 if (info->state & (1<<MD_DISK_FAILFAST))
6514 set_bit(FailFast, &rdev->flags);
6516 if (!mddev->persistent) {
6517 pr_debug("md: nonpersistent superblock ...\n");
6518 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6520 rdev->sb_start = calc_dev_sboffset(rdev);
6521 rdev->sectors = rdev->sb_start;
6523 err = bind_rdev_to_array(rdev, mddev);
6533 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6535 char b[BDEVNAME_SIZE];
6536 struct md_rdev *rdev;
6541 rdev = find_rdev(mddev, dev);
6545 if (rdev->raid_disk < 0)
6548 clear_bit(Blocked, &rdev->flags);
6549 remove_and_add_spares(mddev, rdev);
6551 if (rdev->raid_disk >= 0)
6555 if (mddev_is_clustered(mddev)) {
6556 if (md_cluster_ops->remove_disk(mddev, rdev))
6560 md_kick_rdev_from_array(rdev);
6561 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6563 md_wakeup_thread(mddev->thread);
6565 md_update_sb(mddev, 1);
6566 md_new_event(mddev);
6570 pr_debug("md: cannot remove active disk %s from %s ...\n",
6571 bdevname(rdev->bdev,b), mdname(mddev));
6575 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6577 char b[BDEVNAME_SIZE];
6579 struct md_rdev *rdev;
6584 if (mddev->major_version != 0) {
6585 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6589 if (!mddev->pers->hot_add_disk) {
6590 pr_warn("%s: personality does not support diskops!\n",
6595 rdev = md_import_device(dev, -1, 0);
6597 pr_warn("md: error, md_import_device() returned %ld\n",
6602 if (mddev->persistent)
6603 rdev->sb_start = calc_dev_sboffset(rdev);
6605 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6607 rdev->sectors = rdev->sb_start;
6609 if (test_bit(Faulty, &rdev->flags)) {
6610 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6611 bdevname(rdev->bdev,b), mdname(mddev));
6616 clear_bit(In_sync, &rdev->flags);
6618 rdev->saved_raid_disk = -1;
6619 err = bind_rdev_to_array(rdev, mddev);
6624 * The rest should better be atomic, we can have disk failures
6625 * noticed in interrupt contexts ...
6628 rdev->raid_disk = -1;
6630 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6632 md_update_sb(mddev, 1);
6634 * Kick recovery, maybe this spare has to be added to the
6635 * array immediately.
6637 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6638 md_wakeup_thread(mddev->thread);
6639 md_new_event(mddev);
6647 static int set_bitmap_file(struct mddev *mddev, int fd)
6652 if (!mddev->pers->quiesce || !mddev->thread)
6654 if (mddev->recovery || mddev->sync_thread)
6656 /* we should be able to change the bitmap.. */
6660 struct inode *inode;
6663 if (mddev->bitmap || mddev->bitmap_info.file)
6664 return -EEXIST; /* cannot add when bitmap is present */
6668 pr_warn("%s: error: failed to get bitmap file\n",
6673 inode = f->f_mapping->host;
6674 if (!S_ISREG(inode->i_mode)) {
6675 pr_warn("%s: error: bitmap file must be a regular file\n",
6678 } else if (!(f->f_mode & FMODE_WRITE)) {
6679 pr_warn("%s: error: bitmap file must open for write\n",
6682 } else if (atomic_read(&inode->i_writecount) != 1) {
6683 pr_warn("%s: error: bitmap file is already in use\n",
6691 mddev->bitmap_info.file = f;
6692 mddev->bitmap_info.offset = 0; /* file overrides offset */
6693 } else if (mddev->bitmap == NULL)
6694 return -ENOENT; /* cannot remove what isn't there */
6698 struct bitmap *bitmap;
6700 bitmap = bitmap_create(mddev, -1);
6701 mddev_suspend(mddev);
6702 if (!IS_ERR(bitmap)) {
6703 mddev->bitmap = bitmap;
6704 err = bitmap_load(mddev);
6706 err = PTR_ERR(bitmap);
6708 bitmap_destroy(mddev);
6711 mddev_resume(mddev);
6712 } else if (fd < 0) {
6713 mddev_suspend(mddev);
6714 bitmap_destroy(mddev);
6715 mddev_resume(mddev);
6719 struct file *f = mddev->bitmap_info.file;
6721 spin_lock(&mddev->lock);
6722 mddev->bitmap_info.file = NULL;
6723 spin_unlock(&mddev->lock);
6732 * set_array_info is used two different ways
6733 * The original usage is when creating a new array.
6734 * In this usage, raid_disks is > 0 and it together with
6735 * level, size, not_persistent,layout,chunksize determine the
6736 * shape of the array.
6737 * This will always create an array with a type-0.90.0 superblock.
6738 * The newer usage is when assembling an array.
6739 * In this case raid_disks will be 0, and the major_version field is
6740 * use to determine which style super-blocks are to be found on the devices.
6741 * The minor and patch _version numbers are also kept incase the
6742 * super_block handler wishes to interpret them.
6744 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6747 if (info->raid_disks == 0) {
6748 /* just setting version number for superblock loading */
6749 if (info->major_version < 0 ||
6750 info->major_version >= ARRAY_SIZE(super_types) ||
6751 super_types[info->major_version].name == NULL) {
6752 /* maybe try to auto-load a module? */
6753 pr_warn("md: superblock version %d not known\n",
6754 info->major_version);
6757 mddev->major_version = info->major_version;
6758 mddev->minor_version = info->minor_version;
6759 mddev->patch_version = info->patch_version;
6760 mddev->persistent = !info->not_persistent;
6761 /* ensure mddev_put doesn't delete this now that there
6762 * is some minimal configuration.
6764 mddev->ctime = ktime_get_real_seconds();
6767 mddev->major_version = MD_MAJOR_VERSION;
6768 mddev->minor_version = MD_MINOR_VERSION;
6769 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6770 mddev->ctime = ktime_get_real_seconds();
6772 mddev->level = info->level;
6773 mddev->clevel[0] = 0;
6774 mddev->dev_sectors = 2 * (sector_t)info->size;
6775 mddev->raid_disks = info->raid_disks;
6776 /* don't set md_minor, it is determined by which /dev/md* was
6779 if (info->state & (1<<MD_SB_CLEAN))
6780 mddev->recovery_cp = MaxSector;
6782 mddev->recovery_cp = 0;
6783 mddev->persistent = ! info->not_persistent;
6784 mddev->external = 0;
6786 mddev->layout = info->layout;
6787 if (mddev->level == 0)
6788 /* Cannot trust RAID0 layout info here */
6790 mddev->chunk_sectors = info->chunk_size >> 9;
6792 if (mddev->persistent) {
6793 mddev->max_disks = MD_SB_DISKS;
6795 mddev->sb_flags = 0;
6797 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6799 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6800 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6801 mddev->bitmap_info.offset = 0;
6803 mddev->reshape_position = MaxSector;
6806 * Generate a 128 bit UUID
6808 get_random_bytes(mddev->uuid, 16);
6810 mddev->new_level = mddev->level;
6811 mddev->new_chunk_sectors = mddev->chunk_sectors;
6812 mddev->new_layout = mddev->layout;
6813 mddev->delta_disks = 0;
6814 mddev->reshape_backwards = 0;
6819 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6821 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6823 if (mddev->external_size)
6826 mddev->array_sectors = array_sectors;
6828 EXPORT_SYMBOL(md_set_array_sectors);
6830 static int update_size(struct mddev *mddev, sector_t num_sectors)
6832 struct md_rdev *rdev;
6834 int fit = (num_sectors == 0);
6835 sector_t old_dev_sectors = mddev->dev_sectors;
6837 if (mddev->pers->resize == NULL)
6839 /* The "num_sectors" is the number of sectors of each device that
6840 * is used. This can only make sense for arrays with redundancy.
6841 * linear and raid0 always use whatever space is available. We can only
6842 * consider changing this number if no resync or reconstruction is
6843 * happening, and if the new size is acceptable. It must fit before the
6844 * sb_start or, if that is <data_offset, it must fit before the size
6845 * of each device. If num_sectors is zero, we find the largest size
6848 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6854 rdev_for_each(rdev, mddev) {
6855 sector_t avail = rdev->sectors;
6857 if (fit && (num_sectors == 0 || num_sectors > avail))
6858 num_sectors = avail;
6859 if (avail < num_sectors)
6862 rv = mddev->pers->resize(mddev, num_sectors);
6864 if (mddev_is_clustered(mddev))
6865 md_cluster_ops->update_size(mddev, old_dev_sectors);
6866 else if (mddev->queue) {
6867 set_capacity(mddev->gendisk, mddev->array_sectors);
6868 revalidate_disk(mddev->gendisk);
6874 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6877 struct md_rdev *rdev;
6878 /* change the number of raid disks */
6879 if (mddev->pers->check_reshape == NULL)
6883 if (raid_disks <= 0 ||
6884 (mddev->max_disks && raid_disks >= mddev->max_disks))
6886 if (mddev->sync_thread ||
6887 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6888 mddev->reshape_position != MaxSector)
6891 rdev_for_each(rdev, mddev) {
6892 if (mddev->raid_disks < raid_disks &&
6893 rdev->data_offset < rdev->new_data_offset)
6895 if (mddev->raid_disks > raid_disks &&
6896 rdev->data_offset > rdev->new_data_offset)
6900 mddev->delta_disks = raid_disks - mddev->raid_disks;
6901 if (mddev->delta_disks < 0)
6902 mddev->reshape_backwards = 1;
6903 else if (mddev->delta_disks > 0)
6904 mddev->reshape_backwards = 0;
6906 rv = mddev->pers->check_reshape(mddev);
6908 mddev->delta_disks = 0;
6909 mddev->reshape_backwards = 0;
6915 * update_array_info is used to change the configuration of an
6917 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6918 * fields in the info are checked against the array.
6919 * Any differences that cannot be handled will cause an error.
6920 * Normally, only one change can be managed at a time.
6922 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6928 /* calculate expected state,ignoring low bits */
6929 if (mddev->bitmap && mddev->bitmap_info.offset)
6930 state |= (1 << MD_SB_BITMAP_PRESENT);
6932 if (mddev->major_version != info->major_version ||
6933 mddev->minor_version != info->minor_version ||
6934 /* mddev->patch_version != info->patch_version || */
6935 mddev->ctime != info->ctime ||
6936 mddev->level != info->level ||
6937 /* mddev->layout != info->layout || */
6938 mddev->persistent != !info->not_persistent ||
6939 mddev->chunk_sectors != info->chunk_size >> 9 ||
6940 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6941 ((state^info->state) & 0xfffffe00)
6944 /* Check there is only one change */
6945 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6947 if (mddev->raid_disks != info->raid_disks)
6949 if (mddev->layout != info->layout)
6951 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6958 if (mddev->layout != info->layout) {
6960 * we don't need to do anything at the md level, the
6961 * personality will take care of it all.
6963 if (mddev->pers->check_reshape == NULL)
6966 mddev->new_layout = info->layout;
6967 rv = mddev->pers->check_reshape(mddev);
6969 mddev->new_layout = mddev->layout;
6973 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6974 rv = update_size(mddev, (sector_t)info->size * 2);
6976 if (mddev->raid_disks != info->raid_disks)
6977 rv = update_raid_disks(mddev, info->raid_disks);
6979 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6980 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6984 if (mddev->recovery || mddev->sync_thread) {
6988 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6989 struct bitmap *bitmap;
6990 /* add the bitmap */
6991 if (mddev->bitmap) {
6995 if (mddev->bitmap_info.default_offset == 0) {
6999 mddev->bitmap_info.offset =
7000 mddev->bitmap_info.default_offset;
7001 mddev->bitmap_info.space =
7002 mddev->bitmap_info.default_space;
7003 bitmap = bitmap_create(mddev, -1);
7004 mddev_suspend(mddev);
7005 if (!IS_ERR(bitmap)) {
7006 mddev->bitmap = bitmap;
7007 rv = bitmap_load(mddev);
7009 rv = PTR_ERR(bitmap);
7011 bitmap_destroy(mddev);
7012 mddev_resume(mddev);
7014 /* remove the bitmap */
7015 if (!mddev->bitmap) {
7019 if (mddev->bitmap->storage.file) {
7023 if (mddev->bitmap_info.nodes) {
7024 /* hold PW on all the bitmap lock */
7025 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7026 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7028 md_cluster_ops->unlock_all_bitmaps(mddev);
7032 mddev->bitmap_info.nodes = 0;
7033 md_cluster_ops->leave(mddev);
7035 mddev_suspend(mddev);
7036 bitmap_destroy(mddev);
7037 mddev_resume(mddev);
7038 mddev->bitmap_info.offset = 0;
7041 md_update_sb(mddev, 1);
7047 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7049 struct md_rdev *rdev;
7052 if (mddev->pers == NULL)
7056 rdev = find_rdev_rcu(mddev, dev);
7060 md_error(mddev, rdev);
7061 if (!test_bit(Faulty, &rdev->flags))
7069 * We have a problem here : there is no easy way to give a CHS
7070 * virtual geometry. We currently pretend that we have a 2 heads
7071 * 4 sectors (with a BIG number of cylinders...). This drives
7072 * dosfs just mad... ;-)
7074 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7076 struct mddev *mddev = bdev->bd_disk->private_data;
7080 geo->cylinders = mddev->array_sectors / 8;
7084 static inline bool md_ioctl_valid(unsigned int cmd)
7089 case GET_ARRAY_INFO:
7090 case GET_BITMAP_FILE:
7093 case HOT_REMOVE_DISK:
7096 case RESTART_ARRAY_RW:
7098 case SET_ARRAY_INFO:
7099 case SET_BITMAP_FILE:
7100 case SET_DISK_FAULTY:
7103 case CLUSTERED_DISK_NACK:
7110 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7111 unsigned int cmd, unsigned long arg)
7114 void __user *argp = (void __user *)arg;
7115 struct mddev *mddev = NULL;
7117 bool did_set_md_closing = false;
7119 if (!md_ioctl_valid(cmd))
7124 case GET_ARRAY_INFO:
7128 if (!capable(CAP_SYS_ADMIN))
7133 * Commands dealing with the RAID driver but not any
7138 err = get_version(argp);
7144 autostart_arrays(arg);
7151 * Commands creating/starting a new array:
7154 mddev = bdev->bd_disk->private_data;
7161 /* Some actions do not requires the mutex */
7163 case GET_ARRAY_INFO:
7164 if (!mddev->raid_disks && !mddev->external)
7167 err = get_array_info(mddev, argp);
7171 if (!mddev->raid_disks && !mddev->external)
7174 err = get_disk_info(mddev, argp);
7177 case SET_DISK_FAULTY:
7178 err = set_disk_faulty(mddev, new_decode_dev(arg));
7181 case GET_BITMAP_FILE:
7182 err = get_bitmap_file(mddev, argp);
7187 if (cmd == ADD_NEW_DISK)
7188 /* need to ensure md_delayed_delete() has completed */
7189 flush_workqueue(md_misc_wq);
7191 if (cmd == HOT_REMOVE_DISK)
7192 /* need to ensure recovery thread has run */
7193 wait_event_interruptible_timeout(mddev->sb_wait,
7194 !test_bit(MD_RECOVERY_NEEDED,
7196 msecs_to_jiffies(5000));
7197 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7198 /* Need to flush page cache, and ensure no-one else opens
7201 mutex_lock(&mddev->open_mutex);
7202 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7203 mutex_unlock(&mddev->open_mutex);
7207 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7208 mutex_unlock(&mddev->open_mutex);
7212 did_set_md_closing = true;
7213 mutex_unlock(&mddev->open_mutex);
7214 sync_blockdev(bdev);
7216 err = mddev_lock(mddev);
7218 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7223 if (cmd == SET_ARRAY_INFO) {
7224 mdu_array_info_t info;
7226 memset(&info, 0, sizeof(info));
7227 else if (copy_from_user(&info, argp, sizeof(info))) {
7232 err = update_array_info(mddev, &info);
7234 pr_warn("md: couldn't update array info. %d\n", err);
7239 if (!list_empty(&mddev->disks)) {
7240 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7244 if (mddev->raid_disks) {
7245 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7249 err = set_array_info(mddev, &info);
7251 pr_warn("md: couldn't set array info. %d\n", err);
7258 * Commands querying/configuring an existing array:
7260 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7261 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7262 if ((!mddev->raid_disks && !mddev->external)
7263 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7264 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7265 && cmd != GET_BITMAP_FILE) {
7271 * Commands even a read-only array can execute:
7274 case RESTART_ARRAY_RW:
7275 err = restart_array(mddev);
7279 err = do_md_stop(mddev, 0, bdev);
7283 err = md_set_readonly(mddev, bdev);
7286 case HOT_REMOVE_DISK:
7287 err = hot_remove_disk(mddev, new_decode_dev(arg));
7291 /* We can support ADD_NEW_DISK on read-only arrays
7292 * only if we are re-adding a preexisting device.
7293 * So require mddev->pers and MD_DISK_SYNC.
7296 mdu_disk_info_t info;
7297 if (copy_from_user(&info, argp, sizeof(info)))
7299 else if (!(info.state & (1<<MD_DISK_SYNC)))
7300 /* Need to clear read-only for this */
7303 err = add_new_disk(mddev, &info);
7309 if (get_user(ro, (int __user *)(arg))) {
7315 /* if the bdev is going readonly the value of mddev->ro
7316 * does not matter, no writes are coming
7321 /* are we are already prepared for writes? */
7325 /* transitioning to readauto need only happen for
7326 * arrays that call md_write_start
7329 err = restart_array(mddev);
7332 set_disk_ro(mddev->gendisk, 0);
7339 * The remaining ioctls are changing the state of the
7340 * superblock, so we do not allow them on read-only arrays.
7342 if (mddev->ro && mddev->pers) {
7343 if (mddev->ro == 2) {
7345 sysfs_notify_dirent_safe(mddev->sysfs_state);
7346 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7347 /* mddev_unlock will wake thread */
7348 /* If a device failed while we were read-only, we
7349 * need to make sure the metadata is updated now.
7351 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7352 mddev_unlock(mddev);
7353 wait_event(mddev->sb_wait,
7354 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7355 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7356 mddev_lock_nointr(mddev);
7367 mdu_disk_info_t info;
7368 if (copy_from_user(&info, argp, sizeof(info)))
7371 err = add_new_disk(mddev, &info);
7375 case CLUSTERED_DISK_NACK:
7376 if (mddev_is_clustered(mddev))
7377 md_cluster_ops->new_disk_ack(mddev, false);
7383 err = hot_add_disk(mddev, new_decode_dev(arg));
7387 err = do_md_run(mddev);
7390 case SET_BITMAP_FILE:
7391 err = set_bitmap_file(mddev, (int)arg);
7400 if (mddev->hold_active == UNTIL_IOCTL &&
7402 mddev->hold_active = 0;
7403 mddev_unlock(mddev);
7405 if(did_set_md_closing)
7406 clear_bit(MD_CLOSING, &mddev->flags);
7409 #ifdef CONFIG_COMPAT
7410 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7411 unsigned int cmd, unsigned long arg)
7414 case HOT_REMOVE_DISK:
7416 case SET_DISK_FAULTY:
7417 case SET_BITMAP_FILE:
7418 /* These take in integer arg, do not convert */
7421 arg = (unsigned long)compat_ptr(arg);
7425 return md_ioctl(bdev, mode, cmd, arg);
7427 #endif /* CONFIG_COMPAT */
7429 static int md_open(struct block_device *bdev, fmode_t mode)
7432 * Succeed if we can lock the mddev, which confirms that
7433 * it isn't being stopped right now.
7435 struct mddev *mddev = mddev_find(bdev->bd_dev);
7441 if (mddev->gendisk != bdev->bd_disk) {
7442 /* we are racing with mddev_put which is discarding this
7446 /* Wait until bdev->bd_disk is definitely gone */
7447 if (work_pending(&mddev->del_work))
7448 flush_workqueue(md_misc_wq);
7451 BUG_ON(mddev != bdev->bd_disk->private_data);
7453 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7456 if (test_bit(MD_CLOSING, &mddev->flags)) {
7457 mutex_unlock(&mddev->open_mutex);
7463 atomic_inc(&mddev->openers);
7464 mutex_unlock(&mddev->open_mutex);
7466 check_disk_change(bdev);
7473 static void md_release(struct gendisk *disk, fmode_t mode)
7475 struct mddev *mddev = disk->private_data;
7478 atomic_dec(&mddev->openers);
7482 static int md_media_changed(struct gendisk *disk)
7484 struct mddev *mddev = disk->private_data;
7486 return mddev->changed;
7489 static int md_revalidate(struct gendisk *disk)
7491 struct mddev *mddev = disk->private_data;
7496 static const struct block_device_operations md_fops =
7498 .owner = THIS_MODULE,
7500 .release = md_release,
7502 #ifdef CONFIG_COMPAT
7503 .compat_ioctl = md_compat_ioctl,
7505 .getgeo = md_getgeo,
7506 .media_changed = md_media_changed,
7507 .revalidate_disk= md_revalidate,
7510 static int md_thread(void *arg)
7512 struct md_thread *thread = arg;
7515 * md_thread is a 'system-thread', it's priority should be very
7516 * high. We avoid resource deadlocks individually in each
7517 * raid personality. (RAID5 does preallocation) We also use RR and
7518 * the very same RT priority as kswapd, thus we will never get
7519 * into a priority inversion deadlock.
7521 * we definitely have to have equal or higher priority than
7522 * bdflush, otherwise bdflush will deadlock if there are too
7523 * many dirty RAID5 blocks.
7526 allow_signal(SIGKILL);
7527 while (!kthread_should_stop()) {
7529 /* We need to wait INTERRUPTIBLE so that
7530 * we don't add to the load-average.
7531 * That means we need to be sure no signals are
7534 if (signal_pending(current))
7535 flush_signals(current);
7537 wait_event_interruptible_timeout
7539 test_bit(THREAD_WAKEUP, &thread->flags)
7540 || kthread_should_stop() || kthread_should_park(),
7543 clear_bit(THREAD_WAKEUP, &thread->flags);
7544 if (kthread_should_park())
7546 if (!kthread_should_stop())
7547 thread->run(thread);
7553 void md_wakeup_thread(struct md_thread *thread)
7556 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7557 set_bit(THREAD_WAKEUP, &thread->flags);
7558 wake_up(&thread->wqueue);
7561 EXPORT_SYMBOL(md_wakeup_thread);
7563 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7564 struct mddev *mddev, const char *name)
7566 struct md_thread *thread;
7568 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7572 init_waitqueue_head(&thread->wqueue);
7575 thread->mddev = mddev;
7576 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7577 thread->tsk = kthread_run(md_thread, thread,
7579 mdname(thread->mddev),
7581 if (IS_ERR(thread->tsk)) {
7587 EXPORT_SYMBOL(md_register_thread);
7589 void md_unregister_thread(struct md_thread **threadp)
7591 struct md_thread *thread = *threadp;
7594 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7595 /* Locking ensures that mddev_unlock does not wake_up a
7596 * non-existent thread
7598 spin_lock(&pers_lock);
7600 spin_unlock(&pers_lock);
7602 kthread_stop(thread->tsk);
7605 EXPORT_SYMBOL(md_unregister_thread);
7607 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7609 if (!rdev || test_bit(Faulty, &rdev->flags))
7612 if (!mddev->pers || !mddev->pers->error_handler)
7614 mddev->pers->error_handler(mddev,rdev);
7615 if (mddev->degraded)
7616 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7617 sysfs_notify_dirent_safe(rdev->sysfs_state);
7618 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7619 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7620 md_wakeup_thread(mddev->thread);
7621 if (mddev->event_work.func)
7622 queue_work(md_misc_wq, &mddev->event_work);
7623 md_new_event(mddev);
7625 EXPORT_SYMBOL(md_error);
7627 /* seq_file implementation /proc/mdstat */
7629 static void status_unused(struct seq_file *seq)
7632 struct md_rdev *rdev;
7634 seq_printf(seq, "unused devices: ");
7636 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7637 char b[BDEVNAME_SIZE];
7639 seq_printf(seq, "%s ",
7640 bdevname(rdev->bdev,b));
7643 seq_printf(seq, "<none>");
7645 seq_printf(seq, "\n");
7648 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7650 sector_t max_sectors, resync, res;
7651 unsigned long dt, db = 0;
7652 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7653 int scale, recovery_active;
7654 unsigned int per_milli;
7656 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7657 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7658 max_sectors = mddev->resync_max_sectors;
7660 max_sectors = mddev->dev_sectors;
7662 resync = mddev->curr_resync;
7664 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7665 /* Still cleaning up */
7666 resync = max_sectors;
7668 resync -= atomic_read(&mddev->recovery_active);
7671 if (mddev->recovery_cp < MaxSector) {
7672 seq_printf(seq, "\tresync=PENDING");
7678 seq_printf(seq, "\tresync=DELAYED");
7682 WARN_ON(max_sectors == 0);
7683 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7684 * in a sector_t, and (max_sectors>>scale) will fit in a
7685 * u32, as those are the requirements for sector_div.
7686 * Thus 'scale' must be at least 10
7689 if (sizeof(sector_t) > sizeof(unsigned long)) {
7690 while ( max_sectors/2 > (1ULL<<(scale+32)))
7693 res = (resync>>scale)*1000;
7694 sector_div(res, (u32)((max_sectors>>scale)+1));
7698 int i, x = per_milli/50, y = 20-x;
7699 seq_printf(seq, "[");
7700 for (i = 0; i < x; i++)
7701 seq_printf(seq, "=");
7702 seq_printf(seq, ">");
7703 for (i = 0; i < y; i++)
7704 seq_printf(seq, ".");
7705 seq_printf(seq, "] ");
7707 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7708 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7710 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7712 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7713 "resync" : "recovery"))),
7714 per_milli/10, per_milli % 10,
7715 (unsigned long long) resync/2,
7716 (unsigned long long) max_sectors/2);
7719 * dt: time from mark until now
7720 * db: blocks written from mark until now
7721 * rt: remaining time
7723 * rt is a sector_t, which is always 64bit now. We are keeping
7724 * the original algorithm, but it is not really necessary.
7726 * Original algorithm:
7727 * So we divide before multiply in case it is 32bit and close
7729 * We scale the divisor (db) by 32 to avoid losing precision
7730 * near the end of resync when the number of remaining sectors
7732 * We then divide rt by 32 after multiplying by db to compensate.
7733 * The '+1' avoids division by zero if db is very small.
7735 dt = ((jiffies - mddev->resync_mark) / HZ);
7738 curr_mark_cnt = mddev->curr_mark_cnt;
7739 recovery_active = atomic_read(&mddev->recovery_active);
7740 resync_mark_cnt = mddev->resync_mark_cnt;
7742 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7743 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7745 rt = max_sectors - resync; /* number of remaining sectors */
7746 rt = div64_u64(rt, db/32+1);
7750 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7751 ((unsigned long)rt % 60)/6);
7753 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7757 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7759 struct list_head *tmp;
7761 struct mddev *mddev;
7769 spin_lock(&all_mddevs_lock);
7770 list_for_each(tmp,&all_mddevs)
7772 mddev = list_entry(tmp, struct mddev, all_mddevs);
7774 spin_unlock(&all_mddevs_lock);
7777 spin_unlock(&all_mddevs_lock);
7779 return (void*)2;/* tail */
7783 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7785 struct list_head *tmp;
7786 struct mddev *next_mddev, *mddev = v;
7792 spin_lock(&all_mddevs_lock);
7794 tmp = all_mddevs.next;
7796 tmp = mddev->all_mddevs.next;
7797 if (tmp != &all_mddevs)
7798 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7800 next_mddev = (void*)2;
7803 spin_unlock(&all_mddevs_lock);
7811 static void md_seq_stop(struct seq_file *seq, void *v)
7813 struct mddev *mddev = v;
7815 if (mddev && v != (void*)1 && v != (void*)2)
7819 static int md_seq_show(struct seq_file *seq, void *v)
7821 struct mddev *mddev = v;
7823 struct md_rdev *rdev;
7825 if (v == (void*)1) {
7826 struct md_personality *pers;
7827 seq_printf(seq, "Personalities : ");
7828 spin_lock(&pers_lock);
7829 list_for_each_entry(pers, &pers_list, list)
7830 seq_printf(seq, "[%s] ", pers->name);
7832 spin_unlock(&pers_lock);
7833 seq_printf(seq, "\n");
7834 seq->poll_event = atomic_read(&md_event_count);
7837 if (v == (void*)2) {
7842 spin_lock(&mddev->lock);
7843 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7844 seq_printf(seq, "%s : %sactive", mdname(mddev),
7845 mddev->pers ? "" : "in");
7848 seq_printf(seq, " (read-only)");
7850 seq_printf(seq, " (auto-read-only)");
7851 seq_printf(seq, " %s", mddev->pers->name);
7856 rdev_for_each_rcu(rdev, mddev) {
7857 char b[BDEVNAME_SIZE];
7858 seq_printf(seq, " %s[%d]",
7859 bdevname(rdev->bdev,b), rdev->desc_nr);
7860 if (test_bit(WriteMostly, &rdev->flags))
7861 seq_printf(seq, "(W)");
7862 if (test_bit(Journal, &rdev->flags))
7863 seq_printf(seq, "(J)");
7864 if (test_bit(Faulty, &rdev->flags)) {
7865 seq_printf(seq, "(F)");
7868 if (rdev->raid_disk < 0)
7869 seq_printf(seq, "(S)"); /* spare */
7870 if (test_bit(Replacement, &rdev->flags))
7871 seq_printf(seq, "(R)");
7872 sectors += rdev->sectors;
7876 if (!list_empty(&mddev->disks)) {
7878 seq_printf(seq, "\n %llu blocks",
7879 (unsigned long long)
7880 mddev->array_sectors / 2);
7882 seq_printf(seq, "\n %llu blocks",
7883 (unsigned long long)sectors / 2);
7885 if (mddev->persistent) {
7886 if (mddev->major_version != 0 ||
7887 mddev->minor_version != 90) {
7888 seq_printf(seq," super %d.%d",
7889 mddev->major_version,
7890 mddev->minor_version);
7892 } else if (mddev->external)
7893 seq_printf(seq, " super external:%s",
7894 mddev->metadata_type);
7896 seq_printf(seq, " super non-persistent");
7899 mddev->pers->status(seq, mddev);
7900 seq_printf(seq, "\n ");
7901 if (mddev->pers->sync_request) {
7902 if (status_resync(seq, mddev))
7903 seq_printf(seq, "\n ");
7906 seq_printf(seq, "\n ");
7908 bitmap_status(seq, mddev->bitmap);
7910 seq_printf(seq, "\n");
7912 spin_unlock(&mddev->lock);
7917 static const struct seq_operations md_seq_ops = {
7918 .start = md_seq_start,
7919 .next = md_seq_next,
7920 .stop = md_seq_stop,
7921 .show = md_seq_show,
7924 static int md_seq_open(struct inode *inode, struct file *file)
7926 struct seq_file *seq;
7929 error = seq_open(file, &md_seq_ops);
7933 seq = file->private_data;
7934 seq->poll_event = atomic_read(&md_event_count);
7938 static int md_unloading;
7939 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7941 struct seq_file *seq = filp->private_data;
7945 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7946 poll_wait(filp, &md_event_waiters, wait);
7948 /* always allow read */
7949 mask = POLLIN | POLLRDNORM;
7951 if (seq->poll_event != atomic_read(&md_event_count))
7952 mask |= POLLERR | POLLPRI;
7956 static const struct file_operations md_seq_fops = {
7957 .owner = THIS_MODULE,
7958 .open = md_seq_open,
7960 .llseek = seq_lseek,
7961 .release = seq_release,
7962 .poll = mdstat_poll,
7965 int register_md_personality(struct md_personality *p)
7967 pr_debug("md: %s personality registered for level %d\n",
7969 spin_lock(&pers_lock);
7970 list_add_tail(&p->list, &pers_list);
7971 spin_unlock(&pers_lock);
7974 EXPORT_SYMBOL(register_md_personality);
7976 int unregister_md_personality(struct md_personality *p)
7978 pr_debug("md: %s personality unregistered\n", p->name);
7979 spin_lock(&pers_lock);
7980 list_del_init(&p->list);
7981 spin_unlock(&pers_lock);
7984 EXPORT_SYMBOL(unregister_md_personality);
7986 int register_md_cluster_operations(struct md_cluster_operations *ops,
7987 struct module *module)
7990 spin_lock(&pers_lock);
7991 if (md_cluster_ops != NULL)
7994 md_cluster_ops = ops;
7995 md_cluster_mod = module;
7997 spin_unlock(&pers_lock);
8000 EXPORT_SYMBOL(register_md_cluster_operations);
8002 int unregister_md_cluster_operations(void)
8004 spin_lock(&pers_lock);
8005 md_cluster_ops = NULL;
8006 spin_unlock(&pers_lock);
8009 EXPORT_SYMBOL(unregister_md_cluster_operations);
8011 int md_setup_cluster(struct mddev *mddev, int nodes)
8013 if (!md_cluster_ops)
8014 request_module("md-cluster");
8015 spin_lock(&pers_lock);
8016 /* ensure module won't be unloaded */
8017 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8018 pr_warn("can't find md-cluster module or get it's reference.\n");
8019 spin_unlock(&pers_lock);
8022 spin_unlock(&pers_lock);
8024 return md_cluster_ops->join(mddev, nodes);
8027 void md_cluster_stop(struct mddev *mddev)
8029 if (!md_cluster_ops)
8031 md_cluster_ops->leave(mddev);
8032 module_put(md_cluster_mod);
8035 static int is_mddev_idle(struct mddev *mddev, int init)
8037 struct md_rdev *rdev;
8043 rdev_for_each_rcu(rdev, mddev) {
8044 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8045 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
8046 (int)part_stat_read(&disk->part0, sectors[1]) -
8047 atomic_read(&disk->sync_io);
8048 /* sync IO will cause sync_io to increase before the disk_stats
8049 * as sync_io is counted when a request starts, and
8050 * disk_stats is counted when it completes.
8051 * So resync activity will cause curr_events to be smaller than
8052 * when there was no such activity.
8053 * non-sync IO will cause disk_stat to increase without
8054 * increasing sync_io so curr_events will (eventually)
8055 * be larger than it was before. Once it becomes
8056 * substantially larger, the test below will cause
8057 * the array to appear non-idle, and resync will slow
8059 * If there is a lot of outstanding resync activity when
8060 * we set last_event to curr_events, then all that activity
8061 * completing might cause the array to appear non-idle
8062 * and resync will be slowed down even though there might
8063 * not have been non-resync activity. This will only
8064 * happen once though. 'last_events' will soon reflect
8065 * the state where there is little or no outstanding
8066 * resync requests, and further resync activity will
8067 * always make curr_events less than last_events.
8070 if (init || curr_events - rdev->last_events > 64) {
8071 rdev->last_events = curr_events;
8079 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8081 /* another "blocks" (512byte) blocks have been synced */
8082 atomic_sub(blocks, &mddev->recovery_active);
8083 wake_up(&mddev->recovery_wait);
8085 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8086 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8087 md_wakeup_thread(mddev->thread);
8088 // stop recovery, signal do_sync ....
8091 EXPORT_SYMBOL(md_done_sync);
8093 /* md_write_start(mddev, bi)
8094 * If we need to update some array metadata (e.g. 'active' flag
8095 * in superblock) before writing, schedule a superblock update
8096 * and wait for it to complete.
8097 * A return value of 'false' means that the write wasn't recorded
8098 * and cannot proceed as the array is being suspend.
8100 bool md_write_start(struct mddev *mddev, struct bio *bi)
8104 if (bio_data_dir(bi) != WRITE)
8107 BUG_ON(mddev->ro == 1);
8108 if (mddev->ro == 2) {
8109 /* need to switch to read/write */
8111 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8112 md_wakeup_thread(mddev->thread);
8113 md_wakeup_thread(mddev->sync_thread);
8117 percpu_ref_get(&mddev->writes_pending);
8118 smp_mb(); /* Match smp_mb in set_in_sync() */
8119 if (mddev->safemode == 1)
8120 mddev->safemode = 0;
8121 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8122 if (mddev->in_sync || mddev->sync_checkers) {
8123 spin_lock(&mddev->lock);
8124 if (mddev->in_sync) {
8126 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8127 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8128 md_wakeup_thread(mddev->thread);
8131 spin_unlock(&mddev->lock);
8135 sysfs_notify_dirent_safe(mddev->sysfs_state);
8136 if (!mddev->has_superblocks)
8138 wait_event(mddev->sb_wait,
8139 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8141 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8142 percpu_ref_put(&mddev->writes_pending);
8147 EXPORT_SYMBOL(md_write_start);
8149 /* md_write_inc can only be called when md_write_start() has
8150 * already been called at least once of the current request.
8151 * It increments the counter and is useful when a single request
8152 * is split into several parts. Each part causes an increment and
8153 * so needs a matching md_write_end().
8154 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8155 * a spinlocked region.
8157 void md_write_inc(struct mddev *mddev, struct bio *bi)
8159 if (bio_data_dir(bi) != WRITE)
8161 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8162 percpu_ref_get(&mddev->writes_pending);
8164 EXPORT_SYMBOL(md_write_inc);
8166 void md_write_end(struct mddev *mddev)
8168 percpu_ref_put(&mddev->writes_pending);
8170 if (mddev->safemode == 2)
8171 md_wakeup_thread(mddev->thread);
8172 else if (mddev->safemode_delay)
8173 /* The roundup() ensures this only performs locking once
8174 * every ->safemode_delay jiffies
8176 mod_timer(&mddev->safemode_timer,
8177 roundup(jiffies, mddev->safemode_delay) +
8178 mddev->safemode_delay);
8181 EXPORT_SYMBOL(md_write_end);
8183 /* md_allow_write(mddev)
8184 * Calling this ensures that the array is marked 'active' so that writes
8185 * may proceed without blocking. It is important to call this before
8186 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8187 * Must be called with mddev_lock held.
8189 void md_allow_write(struct mddev *mddev)
8195 if (!mddev->pers->sync_request)
8198 spin_lock(&mddev->lock);
8199 if (mddev->in_sync) {
8201 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8202 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8203 if (mddev->safemode_delay &&
8204 mddev->safemode == 0)
8205 mddev->safemode = 1;
8206 spin_unlock(&mddev->lock);
8207 md_update_sb(mddev, 0);
8208 sysfs_notify_dirent_safe(mddev->sysfs_state);
8209 /* wait for the dirty state to be recorded in the metadata */
8210 wait_event(mddev->sb_wait,
8211 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8213 spin_unlock(&mddev->lock);
8215 EXPORT_SYMBOL_GPL(md_allow_write);
8217 #define SYNC_MARKS 10
8218 #define SYNC_MARK_STEP (3*HZ)
8219 #define UPDATE_FREQUENCY (5*60*HZ)
8220 void md_do_sync(struct md_thread *thread)
8222 struct mddev *mddev = thread->mddev;
8223 struct mddev *mddev2;
8224 unsigned int currspeed = 0,
8226 sector_t max_sectors,j, io_sectors, recovery_done;
8227 unsigned long mark[SYNC_MARKS];
8228 unsigned long update_time;
8229 sector_t mark_cnt[SYNC_MARKS];
8231 struct list_head *tmp;
8232 sector_t last_check;
8234 struct md_rdev *rdev;
8235 char *desc, *action = NULL;
8236 struct blk_plug plug;
8239 /* just incase thread restarts... */
8240 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8242 if (mddev->ro) {/* never try to sync a read-only array */
8243 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8247 if (mddev_is_clustered(mddev)) {
8248 ret = md_cluster_ops->resync_start(mddev);
8252 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8253 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8254 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8255 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8256 && ((unsigned long long)mddev->curr_resync_completed
8257 < (unsigned long long)mddev->resync_max_sectors))
8261 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8262 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8263 desc = "data-check";
8265 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8266 desc = "requested-resync";
8270 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8275 mddev->last_sync_action = action ?: desc;
8277 /* we overload curr_resync somewhat here.
8278 * 0 == not engaged in resync at all
8279 * 2 == checking that there is no conflict with another sync
8280 * 1 == like 2, but have yielded to allow conflicting resync to
8282 * other == active in resync - this many blocks
8284 * Before starting a resync we must have set curr_resync to
8285 * 2, and then checked that every "conflicting" array has curr_resync
8286 * less than ours. When we find one that is the same or higher
8287 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8288 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8289 * This will mean we have to start checking from the beginning again.
8294 int mddev2_minor = -1;
8295 mddev->curr_resync = 2;
8298 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8300 for_each_mddev(mddev2, tmp) {
8301 if (mddev2 == mddev)
8303 if (!mddev->parallel_resync
8304 && mddev2->curr_resync
8305 && match_mddev_units(mddev, mddev2)) {
8307 if (mddev < mddev2 && mddev->curr_resync == 2) {
8308 /* arbitrarily yield */
8309 mddev->curr_resync = 1;
8310 wake_up(&resync_wait);
8312 if (mddev > mddev2 && mddev->curr_resync == 1)
8313 /* no need to wait here, we can wait the next
8314 * time 'round when curr_resync == 2
8317 /* We need to wait 'interruptible' so as not to
8318 * contribute to the load average, and not to
8319 * be caught by 'softlockup'
8321 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8322 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8323 mddev2->curr_resync >= mddev->curr_resync) {
8324 if (mddev2_minor != mddev2->md_minor) {
8325 mddev2_minor = mddev2->md_minor;
8326 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8327 desc, mdname(mddev),
8331 if (signal_pending(current))
8332 flush_signals(current);
8334 finish_wait(&resync_wait, &wq);
8337 finish_wait(&resync_wait, &wq);
8340 } while (mddev->curr_resync < 2);
8343 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8344 /* resync follows the size requested by the personality,
8345 * which defaults to physical size, but can be virtual size
8347 max_sectors = mddev->resync_max_sectors;
8348 atomic64_set(&mddev->resync_mismatches, 0);
8349 /* we don't use the checkpoint if there's a bitmap */
8350 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8351 j = mddev->resync_min;
8352 else if (!mddev->bitmap)
8353 j = mddev->recovery_cp;
8355 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8356 max_sectors = mddev->resync_max_sectors;
8358 /* recovery follows the physical size of devices */
8359 max_sectors = mddev->dev_sectors;
8362 rdev_for_each_rcu(rdev, mddev)
8363 if (rdev->raid_disk >= 0 &&
8364 !test_bit(Journal, &rdev->flags) &&
8365 !test_bit(Faulty, &rdev->flags) &&
8366 !test_bit(In_sync, &rdev->flags) &&
8367 rdev->recovery_offset < j)
8368 j = rdev->recovery_offset;
8371 /* If there is a bitmap, we need to make sure all
8372 * writes that started before we added a spare
8373 * complete before we start doing a recovery.
8374 * Otherwise the write might complete and (via
8375 * bitmap_endwrite) set a bit in the bitmap after the
8376 * recovery has checked that bit and skipped that
8379 if (mddev->bitmap) {
8380 mddev->pers->quiesce(mddev, 1);
8381 mddev->pers->quiesce(mddev, 0);
8385 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8386 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8387 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8388 speed_max(mddev), desc);
8390 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8393 for (m = 0; m < SYNC_MARKS; m++) {
8395 mark_cnt[m] = io_sectors;
8398 mddev->resync_mark = mark[last_mark];
8399 mddev->resync_mark_cnt = mark_cnt[last_mark];
8402 * Tune reconstruction:
8404 window = 32*(PAGE_SIZE/512);
8405 pr_debug("md: using %dk window, over a total of %lluk.\n",
8406 window/2, (unsigned long long)max_sectors/2);
8408 atomic_set(&mddev->recovery_active, 0);
8412 pr_debug("md: resuming %s of %s from checkpoint.\n",
8413 desc, mdname(mddev));
8414 mddev->curr_resync = j;
8416 mddev->curr_resync = 3; /* no longer delayed */
8417 mddev->curr_resync_completed = j;
8418 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8419 md_new_event(mddev);
8420 update_time = jiffies;
8422 blk_start_plug(&plug);
8423 while (j < max_sectors) {
8428 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8429 ((mddev->curr_resync > mddev->curr_resync_completed &&
8430 (mddev->curr_resync - mddev->curr_resync_completed)
8431 > (max_sectors >> 4)) ||
8432 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8433 (j - mddev->curr_resync_completed)*2
8434 >= mddev->resync_max - mddev->curr_resync_completed ||
8435 mddev->curr_resync_completed > mddev->resync_max
8437 /* time to update curr_resync_completed */
8438 wait_event(mddev->recovery_wait,
8439 atomic_read(&mddev->recovery_active) == 0);
8440 mddev->curr_resync_completed = j;
8441 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8442 j > mddev->recovery_cp)
8443 mddev->recovery_cp = j;
8444 update_time = jiffies;
8445 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8446 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8449 while (j >= mddev->resync_max &&
8450 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8451 /* As this condition is controlled by user-space,
8452 * we can block indefinitely, so use '_interruptible'
8453 * to avoid triggering warnings.
8455 flush_signals(current); /* just in case */
8456 wait_event_interruptible(mddev->recovery_wait,
8457 mddev->resync_max > j
8458 || test_bit(MD_RECOVERY_INTR,
8462 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8465 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8467 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8471 if (!skipped) { /* actual IO requested */
8472 io_sectors += sectors;
8473 atomic_add(sectors, &mddev->recovery_active);
8476 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8480 if (j > max_sectors)
8481 /* when skipping, extra large numbers can be returned. */
8484 mddev->curr_resync = j;
8485 mddev->curr_mark_cnt = io_sectors;
8486 if (last_check == 0)
8487 /* this is the earliest that rebuild will be
8488 * visible in /proc/mdstat
8490 md_new_event(mddev);
8492 if (last_check + window > io_sectors || j == max_sectors)
8495 last_check = io_sectors;
8497 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8499 int next = (last_mark+1) % SYNC_MARKS;
8501 mddev->resync_mark = mark[next];
8502 mddev->resync_mark_cnt = mark_cnt[next];
8503 mark[next] = jiffies;
8504 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8508 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8512 * this loop exits only if either when we are slower than
8513 * the 'hard' speed limit, or the system was IO-idle for
8515 * the system might be non-idle CPU-wise, but we only care
8516 * about not overloading the IO subsystem. (things like an
8517 * e2fsck being done on the RAID array should execute fast)
8521 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8522 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8523 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8525 if (currspeed > speed_min(mddev)) {
8526 if (currspeed > speed_max(mddev)) {
8530 if (!is_mddev_idle(mddev, 0)) {
8532 * Give other IO more of a chance.
8533 * The faster the devices, the less we wait.
8535 wait_event(mddev->recovery_wait,
8536 !atomic_read(&mddev->recovery_active));
8540 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8541 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8542 ? "interrupted" : "done");
8544 * this also signals 'finished resyncing' to md_stop
8546 blk_finish_plug(&plug);
8547 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8549 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8550 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8551 mddev->curr_resync > 3) {
8552 mddev->curr_resync_completed = mddev->curr_resync;
8553 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8555 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8557 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8558 mddev->curr_resync > 3) {
8559 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8560 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8561 if (mddev->curr_resync >= mddev->recovery_cp) {
8562 pr_debug("md: checkpointing %s of %s.\n",
8563 desc, mdname(mddev));
8564 if (test_bit(MD_RECOVERY_ERROR,
8566 mddev->recovery_cp =
8567 mddev->curr_resync_completed;
8569 mddev->recovery_cp =
8573 mddev->recovery_cp = MaxSector;
8575 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8576 mddev->curr_resync = MaxSector;
8578 rdev_for_each_rcu(rdev, mddev)
8579 if (rdev->raid_disk >= 0 &&
8580 mddev->delta_disks >= 0 &&
8581 !test_bit(Journal, &rdev->flags) &&
8582 !test_bit(Faulty, &rdev->flags) &&
8583 !test_bit(In_sync, &rdev->flags) &&
8584 rdev->recovery_offset < mddev->curr_resync)
8585 rdev->recovery_offset = mddev->curr_resync;
8590 /* set CHANGE_PENDING here since maybe another update is needed,
8591 * so other nodes are informed. It should be harmless for normal
8593 set_mask_bits(&mddev->sb_flags, 0,
8594 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8596 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8597 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8598 mddev->delta_disks > 0 &&
8599 mddev->pers->finish_reshape &&
8600 mddev->pers->size &&
8602 mddev_lock_nointr(mddev);
8603 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8604 mddev_unlock(mddev);
8605 set_capacity(mddev->gendisk, mddev->array_sectors);
8606 revalidate_disk(mddev->gendisk);
8609 spin_lock(&mddev->lock);
8610 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8611 /* We completed so min/max setting can be forgotten if used. */
8612 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8613 mddev->resync_min = 0;
8614 mddev->resync_max = MaxSector;
8615 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8616 mddev->resync_min = mddev->curr_resync_completed;
8617 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8618 mddev->curr_resync = 0;
8619 spin_unlock(&mddev->lock);
8621 wake_up(&resync_wait);
8622 md_wakeup_thread(mddev->thread);
8625 EXPORT_SYMBOL_GPL(md_do_sync);
8627 static int remove_and_add_spares(struct mddev *mddev,
8628 struct md_rdev *this)
8630 struct md_rdev *rdev;
8633 bool remove_some = false;
8635 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8636 /* Mustn't remove devices when resync thread is running */
8639 rdev_for_each(rdev, mddev) {
8640 if ((this == NULL || rdev == this) &&
8641 rdev->raid_disk >= 0 &&
8642 !test_bit(Blocked, &rdev->flags) &&
8643 test_bit(Faulty, &rdev->flags) &&
8644 atomic_read(&rdev->nr_pending)==0) {
8645 /* Faulty non-Blocked devices with nr_pending == 0
8646 * never get nr_pending incremented,
8647 * never get Faulty cleared, and never get Blocked set.
8648 * So we can synchronize_rcu now rather than once per device
8651 set_bit(RemoveSynchronized, &rdev->flags);
8657 rdev_for_each(rdev, mddev) {
8658 if ((this == NULL || rdev == this) &&
8659 rdev->raid_disk >= 0 &&
8660 !test_bit(Blocked, &rdev->flags) &&
8661 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8662 (!test_bit(In_sync, &rdev->flags) &&
8663 !test_bit(Journal, &rdev->flags))) &&
8664 atomic_read(&rdev->nr_pending)==0)) {
8665 if (mddev->pers->hot_remove_disk(
8666 mddev, rdev) == 0) {
8667 sysfs_unlink_rdev(mddev, rdev);
8668 rdev->saved_raid_disk = rdev->raid_disk;
8669 rdev->raid_disk = -1;
8673 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8674 clear_bit(RemoveSynchronized, &rdev->flags);
8677 if (removed && mddev->kobj.sd)
8678 sysfs_notify(&mddev->kobj, NULL, "degraded");
8680 if (this && removed)
8683 rdev_for_each(rdev, mddev) {
8684 if (this && this != rdev)
8686 if (test_bit(Candidate, &rdev->flags))
8688 if (rdev->raid_disk >= 0 &&
8689 !test_bit(In_sync, &rdev->flags) &&
8690 !test_bit(Journal, &rdev->flags) &&
8691 !test_bit(Faulty, &rdev->flags))
8693 if (rdev->raid_disk >= 0)
8695 if (test_bit(Faulty, &rdev->flags))
8697 if (!test_bit(Journal, &rdev->flags)) {
8699 ! (rdev->saved_raid_disk >= 0 &&
8700 !test_bit(Bitmap_sync, &rdev->flags)))
8703 rdev->recovery_offset = 0;
8706 hot_add_disk(mddev, rdev) == 0) {
8707 if (sysfs_link_rdev(mddev, rdev))
8708 /* failure here is OK */;
8709 if (!test_bit(Journal, &rdev->flags))
8711 md_new_event(mddev);
8712 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8717 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8721 static void md_start_sync(struct work_struct *ws)
8723 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8725 mddev->sync_thread = md_register_thread(md_do_sync,
8728 if (!mddev->sync_thread) {
8729 pr_warn("%s: could not start resync thread...\n",
8731 /* leave the spares where they are, it shouldn't hurt */
8732 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8733 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8734 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8735 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8736 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8737 wake_up(&resync_wait);
8738 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8740 if (mddev->sysfs_action)
8741 sysfs_notify_dirent_safe(mddev->sysfs_action);
8743 md_wakeup_thread(mddev->sync_thread);
8744 sysfs_notify_dirent_safe(mddev->sysfs_action);
8745 md_new_event(mddev);
8749 * This routine is regularly called by all per-raid-array threads to
8750 * deal with generic issues like resync and super-block update.
8751 * Raid personalities that don't have a thread (linear/raid0) do not
8752 * need this as they never do any recovery or update the superblock.
8754 * It does not do any resync itself, but rather "forks" off other threads
8755 * to do that as needed.
8756 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8757 * "->recovery" and create a thread at ->sync_thread.
8758 * When the thread finishes it sets MD_RECOVERY_DONE
8759 * and wakeups up this thread which will reap the thread and finish up.
8760 * This thread also removes any faulty devices (with nr_pending == 0).
8762 * The overall approach is:
8763 * 1/ if the superblock needs updating, update it.
8764 * 2/ If a recovery thread is running, don't do anything else.
8765 * 3/ If recovery has finished, clean up, possibly marking spares active.
8766 * 4/ If there are any faulty devices, remove them.
8767 * 5/ If array is degraded, try to add spares devices
8768 * 6/ If array has spares or is not in-sync, start a resync thread.
8770 void md_check_recovery(struct mddev *mddev)
8772 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8773 /* Write superblock - thread that called mddev_suspend()
8774 * holds reconfig_mutex for us.
8776 set_bit(MD_UPDATING_SB, &mddev->flags);
8777 smp_mb__after_atomic();
8778 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8779 md_update_sb(mddev, 0);
8780 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8781 wake_up(&mddev->sb_wait);
8784 if (mddev->suspended)
8788 bitmap_daemon_work(mddev);
8790 if (signal_pending(current)) {
8791 if (mddev->pers->sync_request && !mddev->external) {
8792 pr_debug("md: %s in immediate safe mode\n",
8794 mddev->safemode = 2;
8796 flush_signals(current);
8799 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8802 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8803 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8804 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8805 (mddev->external == 0 && mddev->safemode == 1) ||
8806 (mddev->safemode == 2
8807 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8811 if (mddev_trylock(mddev)) {
8813 bool try_set_sync = mddev->safemode != 0;
8815 if (!mddev->external && mddev->safemode == 1)
8816 mddev->safemode = 0;
8819 struct md_rdev *rdev;
8820 if (!mddev->external && mddev->in_sync)
8821 /* 'Blocked' flag not needed as failed devices
8822 * will be recorded if array switched to read/write.
8823 * Leaving it set will prevent the device
8824 * from being removed.
8826 rdev_for_each(rdev, mddev)
8827 clear_bit(Blocked, &rdev->flags);
8828 /* On a read-only array we can:
8829 * - remove failed devices
8830 * - add already-in_sync devices if the array itself
8832 * As we only add devices that are already in-sync,
8833 * we can activate the spares immediately.
8835 remove_and_add_spares(mddev, NULL);
8836 /* There is no thread, but we need to call
8837 * ->spare_active and clear saved_raid_disk
8839 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8840 md_reap_sync_thread(mddev);
8841 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8842 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8843 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8847 if (mddev_is_clustered(mddev)) {
8848 struct md_rdev *rdev, *tmp;
8849 /* kick the device if another node issued a
8852 rdev_for_each_safe(rdev, tmp, mddev) {
8853 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8854 rdev->raid_disk < 0)
8855 md_kick_rdev_from_array(rdev);
8859 if (try_set_sync && !mddev->external && !mddev->in_sync) {
8860 spin_lock(&mddev->lock);
8862 spin_unlock(&mddev->lock);
8865 if (mddev->sb_flags)
8866 md_update_sb(mddev, 0);
8868 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8869 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8870 /* resync/recovery still happening */
8871 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8874 if (mddev->sync_thread) {
8875 md_reap_sync_thread(mddev);
8878 /* Set RUNNING before clearing NEEDED to avoid
8879 * any transients in the value of "sync_action".
8881 mddev->curr_resync_completed = 0;
8882 spin_lock(&mddev->lock);
8883 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8884 spin_unlock(&mddev->lock);
8885 /* Clear some bits that don't mean anything, but
8888 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8889 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8891 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8892 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8894 /* no recovery is running.
8895 * remove any failed drives, then
8896 * add spares if possible.
8897 * Spares are also removed and re-added, to allow
8898 * the personality to fail the re-add.
8901 if (mddev->reshape_position != MaxSector) {
8902 if (mddev->pers->check_reshape == NULL ||
8903 mddev->pers->check_reshape(mddev) != 0)
8904 /* Cannot proceed */
8906 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8907 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8908 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8909 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8910 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8911 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8912 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8913 } else if (mddev->recovery_cp < MaxSector) {
8914 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8915 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8916 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8917 /* nothing to be done ... */
8920 if (mddev->pers->sync_request) {
8922 /* We are adding a device or devices to an array
8923 * which has the bitmap stored on all devices.
8924 * So make sure all bitmap pages get written
8926 bitmap_write_all(mddev->bitmap);
8928 INIT_WORK(&mddev->del_work, md_start_sync);
8929 queue_work(md_misc_wq, &mddev->del_work);
8933 if (!mddev->sync_thread) {
8934 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8935 wake_up(&resync_wait);
8936 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8938 if (mddev->sysfs_action)
8939 sysfs_notify_dirent_safe(mddev->sysfs_action);
8942 wake_up(&mddev->sb_wait);
8943 mddev_unlock(mddev);
8946 EXPORT_SYMBOL(md_check_recovery);
8948 void md_reap_sync_thread(struct mddev *mddev)
8950 struct md_rdev *rdev;
8952 /* resync has finished, collect result */
8953 md_unregister_thread(&mddev->sync_thread);
8954 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8955 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
8956 mddev->degraded != mddev->raid_disks) {
8958 /* activate any spares */
8959 if (mddev->pers->spare_active(mddev)) {
8960 sysfs_notify(&mddev->kobj, NULL,
8962 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8965 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8966 mddev->pers->finish_reshape)
8967 mddev->pers->finish_reshape(mddev);
8969 /* If array is no-longer degraded, then any saved_raid_disk
8970 * information must be scrapped.
8972 if (!mddev->degraded)
8973 rdev_for_each(rdev, mddev)
8974 rdev->saved_raid_disk = -1;
8976 md_update_sb(mddev, 1);
8977 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8978 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8980 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8981 md_cluster_ops->resync_finish(mddev);
8982 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8983 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8984 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8985 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8986 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8987 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8988 wake_up(&resync_wait);
8989 /* flag recovery needed just to double check */
8990 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8991 sysfs_notify_dirent_safe(mddev->sysfs_action);
8992 md_new_event(mddev);
8993 if (mddev->event_work.func)
8994 queue_work(md_misc_wq, &mddev->event_work);
8996 EXPORT_SYMBOL(md_reap_sync_thread);
8998 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9000 sysfs_notify_dirent_safe(rdev->sysfs_state);
9001 wait_event_timeout(rdev->blocked_wait,
9002 !test_bit(Blocked, &rdev->flags) &&
9003 !test_bit(BlockedBadBlocks, &rdev->flags),
9004 msecs_to_jiffies(5000));
9005 rdev_dec_pending(rdev, mddev);
9007 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9009 void md_finish_reshape(struct mddev *mddev)
9011 /* called be personality module when reshape completes. */
9012 struct md_rdev *rdev;
9014 rdev_for_each(rdev, mddev) {
9015 if (rdev->data_offset > rdev->new_data_offset)
9016 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9018 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9019 rdev->data_offset = rdev->new_data_offset;
9022 EXPORT_SYMBOL(md_finish_reshape);
9024 /* Bad block management */
9026 /* Returns 1 on success, 0 on failure */
9027 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9030 struct mddev *mddev = rdev->mddev;
9033 s += rdev->new_data_offset;
9035 s += rdev->data_offset;
9036 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9038 /* Make sure they get written out promptly */
9039 if (test_bit(ExternalBbl, &rdev->flags))
9040 sysfs_notify(&rdev->kobj, NULL,
9041 "unacknowledged_bad_blocks");
9042 sysfs_notify_dirent_safe(rdev->sysfs_state);
9043 set_mask_bits(&mddev->sb_flags, 0,
9044 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9045 md_wakeup_thread(rdev->mddev->thread);
9050 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9052 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9057 s += rdev->new_data_offset;
9059 s += rdev->data_offset;
9060 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9061 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9062 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9065 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9067 static int md_notify_reboot(struct notifier_block *this,
9068 unsigned long code, void *x)
9070 struct list_head *tmp;
9071 struct mddev *mddev;
9074 for_each_mddev(mddev, tmp) {
9075 if (mddev_trylock(mddev)) {
9077 __md_stop_writes(mddev);
9078 if (mddev->persistent)
9079 mddev->safemode = 2;
9080 mddev_unlock(mddev);
9085 * certain more exotic SCSI devices are known to be
9086 * volatile wrt too early system reboots. While the
9087 * right place to handle this issue is the given
9088 * driver, we do want to have a safe RAID driver ...
9096 static struct notifier_block md_notifier = {
9097 .notifier_call = md_notify_reboot,
9099 .priority = INT_MAX, /* before any real devices */
9102 static void md_geninit(void)
9104 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9106 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9109 static int __init md_init(void)
9113 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9117 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9121 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9124 if ((ret = register_blkdev(0, "mdp")) < 0)
9128 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9129 md_probe, NULL, NULL);
9130 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9131 md_probe, NULL, NULL);
9133 register_reboot_notifier(&md_notifier);
9134 raid_table_header = register_sysctl_table(raid_root_table);
9140 unregister_blkdev(MD_MAJOR, "md");
9142 destroy_workqueue(md_misc_wq);
9144 destroy_workqueue(md_wq);
9149 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9151 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9152 struct md_rdev *rdev2, *tmp;
9154 char b[BDEVNAME_SIZE];
9157 * If size is changed in another node then we need to
9158 * do resize as well.
9160 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9161 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9163 pr_info("md-cluster: resize failed\n");
9165 bitmap_update_sb(mddev->bitmap);
9168 /* Check for change of roles in the active devices */
9169 rdev_for_each_safe(rdev2, tmp, mddev) {
9170 if (test_bit(Faulty, &rdev2->flags))
9173 /* Check if the roles changed */
9174 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9176 if (test_bit(Candidate, &rdev2->flags)) {
9177 if (role == 0xfffe) {
9178 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9179 md_kick_rdev_from_array(rdev2);
9183 clear_bit(Candidate, &rdev2->flags);
9186 if (role != rdev2->raid_disk) {
9188 if (rdev2->raid_disk == -1 && role != 0xffff) {
9189 rdev2->saved_raid_disk = role;
9190 ret = remove_and_add_spares(mddev, rdev2);
9191 pr_info("Activated spare: %s\n",
9192 bdevname(rdev2->bdev,b));
9193 /* wakeup mddev->thread here, so array could
9194 * perform resync with the new activated disk */
9195 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9196 md_wakeup_thread(mddev->thread);
9200 * We just want to do the minimum to mark the disk
9201 * as faulty. The recovery is performed by the
9202 * one who initiated the error.
9204 if ((role == 0xfffe) || (role == 0xfffd)) {
9205 md_error(mddev, rdev2);
9206 clear_bit(Blocked, &rdev2->flags);
9211 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9212 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9214 /* Finally set the event to be up to date */
9215 mddev->events = le64_to_cpu(sb->events);
9218 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9221 struct page *swapout = rdev->sb_page;
9222 struct mdp_superblock_1 *sb;
9224 /* Store the sb page of the rdev in the swapout temporary
9225 * variable in case we err in the future
9227 rdev->sb_page = NULL;
9228 err = alloc_disk_sb(rdev);
9230 ClearPageUptodate(rdev->sb_page);
9231 rdev->sb_loaded = 0;
9232 err = super_types[mddev->major_version].
9233 load_super(rdev, NULL, mddev->minor_version);
9236 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9237 __func__, __LINE__, rdev->desc_nr, err);
9239 put_page(rdev->sb_page);
9240 rdev->sb_page = swapout;
9241 rdev->sb_loaded = 1;
9245 sb = page_address(rdev->sb_page);
9246 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9250 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9251 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9253 /* The other node finished recovery, call spare_active to set
9254 * device In_sync and mddev->degraded
9256 if (rdev->recovery_offset == MaxSector &&
9257 !test_bit(In_sync, &rdev->flags) &&
9258 mddev->pers->spare_active(mddev))
9259 sysfs_notify(&mddev->kobj, NULL, "degraded");
9265 void md_reload_sb(struct mddev *mddev, int nr)
9267 struct md_rdev *rdev;
9271 rdev_for_each_rcu(rdev, mddev) {
9272 if (rdev->desc_nr == nr)
9276 if (!rdev || rdev->desc_nr != nr) {
9277 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9281 err = read_rdev(mddev, rdev);
9285 check_sb_changes(mddev, rdev);
9287 /* Read all rdev's to update recovery_offset */
9288 rdev_for_each_rcu(rdev, mddev)
9289 read_rdev(mddev, rdev);
9291 EXPORT_SYMBOL(md_reload_sb);
9296 * Searches all registered partitions for autorun RAID arrays
9300 static DEFINE_MUTEX(detected_devices_mutex);
9301 static LIST_HEAD(all_detected_devices);
9302 struct detected_devices_node {
9303 struct list_head list;
9307 void md_autodetect_dev(dev_t dev)
9309 struct detected_devices_node *node_detected_dev;
9311 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9312 if (node_detected_dev) {
9313 node_detected_dev->dev = dev;
9314 mutex_lock(&detected_devices_mutex);
9315 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9316 mutex_unlock(&detected_devices_mutex);
9320 static void autostart_arrays(int part)
9322 struct md_rdev *rdev;
9323 struct detected_devices_node *node_detected_dev;
9325 int i_scanned, i_passed;
9330 pr_info("md: Autodetecting RAID arrays.\n");
9332 mutex_lock(&detected_devices_mutex);
9333 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9335 node_detected_dev = list_entry(all_detected_devices.next,
9336 struct detected_devices_node, list);
9337 list_del(&node_detected_dev->list);
9338 dev = node_detected_dev->dev;
9339 kfree(node_detected_dev);
9340 mutex_unlock(&detected_devices_mutex);
9341 rdev = md_import_device(dev,0, 90);
9342 mutex_lock(&detected_devices_mutex);
9346 if (test_bit(Faulty, &rdev->flags))
9349 set_bit(AutoDetected, &rdev->flags);
9350 list_add(&rdev->same_set, &pending_raid_disks);
9353 mutex_unlock(&detected_devices_mutex);
9355 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9357 autorun_devices(part);
9360 #endif /* !MODULE */
9362 static __exit void md_exit(void)
9364 struct mddev *mddev;
9365 struct list_head *tmp;
9368 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9369 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9371 unregister_blkdev(MD_MAJOR,"md");
9372 unregister_blkdev(mdp_major, "mdp");
9373 unregister_reboot_notifier(&md_notifier);
9374 unregister_sysctl_table(raid_table_header);
9376 /* We cannot unload the modules while some process is
9377 * waiting for us in select() or poll() - wake them up
9380 while (waitqueue_active(&md_event_waiters)) {
9381 /* not safe to leave yet */
9382 wake_up(&md_event_waiters);
9386 remove_proc_entry("mdstat", NULL);
9388 for_each_mddev(mddev, tmp) {
9389 export_array(mddev);
9391 mddev->hold_active = 0;
9393 * for_each_mddev() will call mddev_put() at the end of each
9394 * iteration. As the mddev is now fully clear, this will
9395 * schedule the mddev for destruction by a workqueue, and the
9396 * destroy_workqueue() below will wait for that to complete.
9399 destroy_workqueue(md_misc_wq);
9400 destroy_workqueue(md_wq);
9403 subsys_initcall(md_init);
9404 module_exit(md_exit)
9406 static int get_ro(char *buffer, struct kernel_param *kp)
9408 return sprintf(buffer, "%d", start_readonly);
9410 static int set_ro(const char *val, struct kernel_param *kp)
9412 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9415 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9416 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9417 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9418 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9420 MODULE_LICENSE("GPL");
9421 MODULE_DESCRIPTION("MD RAID framework");
9423 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);