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;
423 rdev_dec_pending(rdev, mddev);
425 if (atomic_dec_and_test(&mddev->flush_pending)) {
426 /* The pre-request flush has finished */
427 queue_work(md_wq, &mddev->flush_work);
431 static void md_submit_flush_data(struct work_struct *ws);
433 static void submit_flushes(struct work_struct *ws)
435 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
436 struct md_rdev *rdev;
438 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
439 atomic_set(&mddev->flush_pending, 1);
441 rdev_for_each_rcu(rdev, mddev)
442 if (rdev->raid_disk >= 0 &&
443 !test_bit(Faulty, &rdev->flags)) {
444 /* Take two references, one is dropped
445 * when request finishes, one after
446 * we reclaim rcu_read_lock
449 atomic_inc(&rdev->nr_pending);
450 atomic_inc(&rdev->nr_pending);
452 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
453 bi->bi_end_io = md_end_flush;
454 bi->bi_private = rdev;
455 bio_set_dev(bi, rdev->bdev);
456 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
457 atomic_inc(&mddev->flush_pending);
460 rdev_dec_pending(rdev, mddev);
463 if (atomic_dec_and_test(&mddev->flush_pending))
464 queue_work(md_wq, &mddev->flush_work);
467 static void md_submit_flush_data(struct work_struct *ws)
469 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
470 struct bio *bio = mddev->flush_bio;
473 * must reset flush_bio before calling into md_handle_request to avoid a
474 * deadlock, because other bios passed md_handle_request suspend check
475 * could wait for this and below md_handle_request could wait for those
476 * bios because of suspend check
478 mddev->flush_bio = NULL;
479 wake_up(&mddev->sb_wait);
481 if (bio->bi_iter.bi_size == 0)
482 /* an empty barrier - all done */
485 bio->bi_opf &= ~REQ_PREFLUSH;
486 md_handle_request(mddev, bio);
490 void md_flush_request(struct mddev *mddev, struct bio *bio)
492 spin_lock_irq(&mddev->lock);
493 wait_event_lock_irq(mddev->sb_wait,
496 mddev->flush_bio = bio;
497 spin_unlock_irq(&mddev->lock);
499 INIT_WORK(&mddev->flush_work, submit_flushes);
500 queue_work(md_wq, &mddev->flush_work);
502 EXPORT_SYMBOL(md_flush_request);
504 static inline struct mddev *mddev_get(struct mddev *mddev)
506 atomic_inc(&mddev->active);
510 static void mddev_delayed_delete(struct work_struct *ws);
512 static void mddev_put(struct mddev *mddev)
514 struct bio_set *bs = NULL, *sync_bs = NULL;
516 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
518 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
519 mddev->ctime == 0 && !mddev->hold_active) {
520 /* Array is not configured at all, and not held active,
522 list_del_init(&mddev->all_mddevs);
524 sync_bs = mddev->sync_set;
525 mddev->bio_set = NULL;
526 mddev->sync_set = NULL;
527 if (mddev->gendisk) {
528 /* We did a probe so need to clean up. Call
529 * queue_work inside the spinlock so that
530 * flush_workqueue() after mddev_find will
531 * succeed in waiting for the work to be done.
533 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
534 queue_work(md_misc_wq, &mddev->del_work);
538 spin_unlock(&all_mddevs_lock);
542 bioset_free(sync_bs);
545 static void md_safemode_timeout(unsigned long data);
547 void mddev_init(struct mddev *mddev)
549 mutex_init(&mddev->open_mutex);
550 mutex_init(&mddev->reconfig_mutex);
551 mutex_init(&mddev->bitmap_info.mutex);
552 INIT_LIST_HEAD(&mddev->disks);
553 INIT_LIST_HEAD(&mddev->all_mddevs);
554 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
555 (unsigned long) mddev);
556 atomic_set(&mddev->active, 1);
557 atomic_set(&mddev->openers, 0);
558 atomic_set(&mddev->active_io, 0);
559 spin_lock_init(&mddev->lock);
560 atomic_set(&mddev->flush_pending, 0);
561 init_waitqueue_head(&mddev->sb_wait);
562 init_waitqueue_head(&mddev->recovery_wait);
563 mddev->reshape_position = MaxSector;
564 mddev->reshape_backwards = 0;
565 mddev->last_sync_action = "none";
566 mddev->resync_min = 0;
567 mddev->resync_max = MaxSector;
568 mddev->level = LEVEL_NONE;
570 EXPORT_SYMBOL_GPL(mddev_init);
572 static struct mddev *mddev_find_locked(dev_t unit)
576 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
577 if (mddev->unit == unit)
583 static struct mddev *mddev_find(dev_t unit)
587 if (MAJOR(unit) != MD_MAJOR)
588 unit &= ~((1 << MdpMinorShift) - 1);
590 spin_lock(&all_mddevs_lock);
591 mddev = mddev_find_locked(unit);
594 spin_unlock(&all_mddevs_lock);
599 static struct mddev *mddev_find_or_alloc(dev_t unit)
601 struct mddev *mddev, *new = NULL;
603 if (unit && MAJOR(unit) != MD_MAJOR)
604 unit &= ~((1<<MdpMinorShift)-1);
607 spin_lock(&all_mddevs_lock);
610 mddev = mddev_find_locked(unit);
613 spin_unlock(&all_mddevs_lock);
619 list_add(&new->all_mddevs, &all_mddevs);
620 spin_unlock(&all_mddevs_lock);
621 new->hold_active = UNTIL_IOCTL;
625 /* find an unused unit number */
626 static int next_minor = 512;
627 int start = next_minor;
631 dev = MKDEV(MD_MAJOR, next_minor);
633 if (next_minor > MINORMASK)
635 if (next_minor == start) {
636 /* Oh dear, all in use. */
637 spin_unlock(&all_mddevs_lock);
642 is_free = !mddev_find_locked(dev);
645 new->md_minor = MINOR(dev);
646 new->hold_active = UNTIL_STOP;
647 list_add(&new->all_mddevs, &all_mddevs);
648 spin_unlock(&all_mddevs_lock);
651 spin_unlock(&all_mddevs_lock);
653 new = kzalloc(sizeof(*new), GFP_KERNEL);
658 if (MAJOR(unit) == MD_MAJOR)
659 new->md_minor = MINOR(unit);
661 new->md_minor = MINOR(unit) >> MdpMinorShift;
668 static struct attribute_group md_redundancy_group;
670 void mddev_unlock(struct mddev *mddev)
672 if (mddev->to_remove) {
673 /* These cannot be removed under reconfig_mutex as
674 * an access to the files will try to take reconfig_mutex
675 * while holding the file unremovable, which leads to
677 * So hold set sysfs_active while the remove in happeing,
678 * and anything else which might set ->to_remove or my
679 * otherwise change the sysfs namespace will fail with
680 * -EBUSY if sysfs_active is still set.
681 * We set sysfs_active under reconfig_mutex and elsewhere
682 * test it under the same mutex to ensure its correct value
685 struct attribute_group *to_remove = mddev->to_remove;
686 mddev->to_remove = NULL;
687 mddev->sysfs_active = 1;
688 mutex_unlock(&mddev->reconfig_mutex);
690 if (mddev->kobj.sd) {
691 if (to_remove != &md_redundancy_group)
692 sysfs_remove_group(&mddev->kobj, to_remove);
693 if (mddev->pers == NULL ||
694 mddev->pers->sync_request == NULL) {
695 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
696 if (mddev->sysfs_action)
697 sysfs_put(mddev->sysfs_action);
698 mddev->sysfs_action = NULL;
701 mddev->sysfs_active = 0;
703 mutex_unlock(&mddev->reconfig_mutex);
705 /* As we've dropped the mutex we need a spinlock to
706 * make sure the thread doesn't disappear
708 spin_lock(&pers_lock);
709 md_wakeup_thread(mddev->thread);
710 wake_up(&mddev->sb_wait);
711 spin_unlock(&pers_lock);
713 EXPORT_SYMBOL_GPL(mddev_unlock);
715 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
717 struct md_rdev *rdev;
719 rdev_for_each_rcu(rdev, mddev)
720 if (rdev->desc_nr == nr)
725 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
727 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
729 struct md_rdev *rdev;
731 rdev_for_each(rdev, mddev)
732 if (rdev->bdev->bd_dev == dev)
738 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
740 struct md_rdev *rdev;
742 rdev_for_each_rcu(rdev, mddev)
743 if (rdev->bdev->bd_dev == dev)
749 static struct md_personality *find_pers(int level, char *clevel)
751 struct md_personality *pers;
752 list_for_each_entry(pers, &pers_list, list) {
753 if (level != LEVEL_NONE && pers->level == level)
755 if (strcmp(pers->name, clevel)==0)
761 /* return the offset of the super block in 512byte sectors */
762 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
764 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
765 return MD_NEW_SIZE_SECTORS(num_sectors);
768 static int alloc_disk_sb(struct md_rdev *rdev)
770 rdev->sb_page = alloc_page(GFP_KERNEL);
776 void md_rdev_clear(struct md_rdev *rdev)
779 put_page(rdev->sb_page);
781 rdev->sb_page = NULL;
786 put_page(rdev->bb_page);
787 rdev->bb_page = NULL;
789 badblocks_exit(&rdev->badblocks);
791 EXPORT_SYMBOL_GPL(md_rdev_clear);
793 static void super_written(struct bio *bio)
795 struct md_rdev *rdev = bio->bi_private;
796 struct mddev *mddev = rdev->mddev;
798 if (bio->bi_status) {
799 pr_err("md: super_written gets error=%d\n", bio->bi_status);
800 md_error(mddev, rdev);
801 if (!test_bit(Faulty, &rdev->flags)
802 && (bio->bi_opf & MD_FAILFAST)) {
803 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
804 set_bit(LastDev, &rdev->flags);
807 clear_bit(LastDev, &rdev->flags);
811 rdev_dec_pending(rdev, mddev);
813 if (atomic_dec_and_test(&mddev->pending_writes))
814 wake_up(&mddev->sb_wait);
817 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
818 sector_t sector, int size, struct page *page)
820 /* write first size bytes of page to sector of rdev
821 * Increment mddev->pending_writes before returning
822 * and decrement it on completion, waking up sb_wait
823 * if zero is reached.
824 * If an error occurred, call md_error
832 if (test_bit(Faulty, &rdev->flags))
835 bio = md_bio_alloc_sync(mddev);
837 atomic_inc(&rdev->nr_pending);
839 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
840 bio->bi_iter.bi_sector = sector;
841 bio_add_page(bio, page, size, 0);
842 bio->bi_private = rdev;
843 bio->bi_end_io = super_written;
845 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
846 test_bit(FailFast, &rdev->flags) &&
847 !test_bit(LastDev, &rdev->flags))
849 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
851 atomic_inc(&mddev->pending_writes);
855 int md_super_wait(struct mddev *mddev)
857 /* wait for all superblock writes that were scheduled to complete */
858 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
859 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
864 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
865 struct page *page, int op, int op_flags, bool metadata_op)
867 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
870 if (metadata_op && rdev->meta_bdev)
871 bio_set_dev(bio, rdev->meta_bdev);
873 bio_set_dev(bio, rdev->bdev);
874 bio_set_op_attrs(bio, op, op_flags);
876 bio->bi_iter.bi_sector = sector + rdev->sb_start;
877 else if (rdev->mddev->reshape_position != MaxSector &&
878 (rdev->mddev->reshape_backwards ==
879 (sector >= rdev->mddev->reshape_position)))
880 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
882 bio->bi_iter.bi_sector = sector + rdev->data_offset;
883 bio_add_page(bio, page, size, 0);
885 submit_bio_wait(bio);
887 ret = !bio->bi_status;
891 EXPORT_SYMBOL_GPL(sync_page_io);
893 static int read_disk_sb(struct md_rdev *rdev, int size)
895 char b[BDEVNAME_SIZE];
900 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
906 pr_err("md: disabled device %s, could not read superblock.\n",
907 bdevname(rdev->bdev,b));
911 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
913 return sb1->set_uuid0 == sb2->set_uuid0 &&
914 sb1->set_uuid1 == sb2->set_uuid1 &&
915 sb1->set_uuid2 == sb2->set_uuid2 &&
916 sb1->set_uuid3 == sb2->set_uuid3;
919 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
922 mdp_super_t *tmp1, *tmp2;
924 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
925 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
927 if (!tmp1 || !tmp2) {
936 * nr_disks is not constant
941 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
948 static u32 md_csum_fold(u32 csum)
950 csum = (csum & 0xffff) + (csum >> 16);
951 return (csum & 0xffff) + (csum >> 16);
954 static unsigned int calc_sb_csum(mdp_super_t *sb)
957 u32 *sb32 = (u32*)sb;
959 unsigned int disk_csum, csum;
961 disk_csum = sb->sb_csum;
964 for (i = 0; i < MD_SB_BYTES/4 ; i++)
966 csum = (newcsum & 0xffffffff) + (newcsum>>32);
969 /* This used to use csum_partial, which was wrong for several
970 * reasons including that different results are returned on
971 * different architectures. It isn't critical that we get exactly
972 * the same return value as before (we always csum_fold before
973 * testing, and that removes any differences). However as we
974 * know that csum_partial always returned a 16bit value on
975 * alphas, do a fold to maximise conformity to previous behaviour.
977 sb->sb_csum = md_csum_fold(disk_csum);
979 sb->sb_csum = disk_csum;
985 * Handle superblock details.
986 * We want to be able to handle multiple superblock formats
987 * so we have a common interface to them all, and an array of
988 * different handlers.
989 * We rely on user-space to write the initial superblock, and support
990 * reading and updating of superblocks.
991 * Interface methods are:
992 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
993 * loads and validates a superblock on dev.
994 * if refdev != NULL, compare superblocks on both devices
996 * 0 - dev has a superblock that is compatible with refdev
997 * 1 - dev has a superblock that is compatible and newer than refdev
998 * so dev should be used as the refdev in future
999 * -EINVAL superblock incompatible or invalid
1000 * -othererror e.g. -EIO
1002 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1003 * Verify that dev is acceptable into mddev.
1004 * The first time, mddev->raid_disks will be 0, and data from
1005 * dev should be merged in. Subsequent calls check that dev
1006 * is new enough. Return 0 or -EINVAL
1008 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1009 * Update the superblock for rdev with data in mddev
1010 * This does not write to disc.
1016 struct module *owner;
1017 int (*load_super)(struct md_rdev *rdev,
1018 struct md_rdev *refdev,
1020 int (*validate_super)(struct mddev *mddev,
1021 struct md_rdev *rdev);
1022 void (*sync_super)(struct mddev *mddev,
1023 struct md_rdev *rdev);
1024 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1025 sector_t num_sectors);
1026 int (*allow_new_offset)(struct md_rdev *rdev,
1027 unsigned long long new_offset);
1031 * Check that the given mddev has no bitmap.
1033 * This function is called from the run method of all personalities that do not
1034 * support bitmaps. It prints an error message and returns non-zero if mddev
1035 * has a bitmap. Otherwise, it returns 0.
1038 int md_check_no_bitmap(struct mddev *mddev)
1040 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1042 pr_warn("%s: bitmaps are not supported for %s\n",
1043 mdname(mddev), mddev->pers->name);
1046 EXPORT_SYMBOL(md_check_no_bitmap);
1049 * load_super for 0.90.0
1051 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1053 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1058 * Calculate the position of the superblock (512byte sectors),
1059 * it's at the end of the disk.
1061 * It also happens to be a multiple of 4Kb.
1063 rdev->sb_start = calc_dev_sboffset(rdev);
1065 ret = read_disk_sb(rdev, MD_SB_BYTES);
1071 bdevname(rdev->bdev, b);
1072 sb = page_address(rdev->sb_page);
1074 if (sb->md_magic != MD_SB_MAGIC) {
1075 pr_warn("md: invalid raid superblock magic on %s\n", b);
1079 if (sb->major_version != 0 ||
1080 sb->minor_version < 90 ||
1081 sb->minor_version > 91) {
1082 pr_warn("Bad version number %d.%d on %s\n",
1083 sb->major_version, sb->minor_version, b);
1087 if (sb->raid_disks <= 0)
1090 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1091 pr_warn("md: invalid superblock checksum on %s\n", b);
1095 rdev->preferred_minor = sb->md_minor;
1096 rdev->data_offset = 0;
1097 rdev->new_data_offset = 0;
1098 rdev->sb_size = MD_SB_BYTES;
1099 rdev->badblocks.shift = -1;
1101 if (sb->level == LEVEL_MULTIPATH)
1104 rdev->desc_nr = sb->this_disk.number;
1110 mdp_super_t *refsb = page_address(refdev->sb_page);
1111 if (!md_uuid_equal(refsb, sb)) {
1112 pr_warn("md: %s has different UUID to %s\n",
1113 b, bdevname(refdev->bdev,b2));
1116 if (!md_sb_equal(refsb, sb)) {
1117 pr_warn("md: %s has same UUID but different superblock to %s\n",
1118 b, bdevname(refdev->bdev, b2));
1122 ev2 = md_event(refsb);
1128 rdev->sectors = rdev->sb_start;
1129 /* Limit to 4TB as metadata cannot record more than that.
1130 * (not needed for Linear and RAID0 as metadata doesn't
1133 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1135 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1137 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1138 /* "this cannot possibly happen" ... */
1146 * validate_super for 0.90.0
1148 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1151 mdp_super_t *sb = page_address(rdev->sb_page);
1152 __u64 ev1 = md_event(sb);
1154 rdev->raid_disk = -1;
1155 clear_bit(Faulty, &rdev->flags);
1156 clear_bit(In_sync, &rdev->flags);
1157 clear_bit(Bitmap_sync, &rdev->flags);
1158 clear_bit(WriteMostly, &rdev->flags);
1160 if (mddev->raid_disks == 0) {
1161 mddev->major_version = 0;
1162 mddev->minor_version = sb->minor_version;
1163 mddev->patch_version = sb->patch_version;
1164 mddev->external = 0;
1165 mddev->chunk_sectors = sb->chunk_size >> 9;
1166 mddev->ctime = sb->ctime;
1167 mddev->utime = sb->utime;
1168 mddev->level = sb->level;
1169 mddev->clevel[0] = 0;
1170 mddev->layout = sb->layout;
1171 mddev->raid_disks = sb->raid_disks;
1172 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1173 mddev->events = ev1;
1174 mddev->bitmap_info.offset = 0;
1175 mddev->bitmap_info.space = 0;
1176 /* bitmap can use 60 K after the 4K superblocks */
1177 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1178 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1179 mddev->reshape_backwards = 0;
1181 if (mddev->minor_version >= 91) {
1182 mddev->reshape_position = sb->reshape_position;
1183 mddev->delta_disks = sb->delta_disks;
1184 mddev->new_level = sb->new_level;
1185 mddev->new_layout = sb->new_layout;
1186 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1187 if (mddev->delta_disks < 0)
1188 mddev->reshape_backwards = 1;
1190 mddev->reshape_position = MaxSector;
1191 mddev->delta_disks = 0;
1192 mddev->new_level = mddev->level;
1193 mddev->new_layout = mddev->layout;
1194 mddev->new_chunk_sectors = mddev->chunk_sectors;
1196 if (mddev->level == 0)
1199 if (sb->state & (1<<MD_SB_CLEAN))
1200 mddev->recovery_cp = MaxSector;
1202 if (sb->events_hi == sb->cp_events_hi &&
1203 sb->events_lo == sb->cp_events_lo) {
1204 mddev->recovery_cp = sb->recovery_cp;
1206 mddev->recovery_cp = 0;
1209 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1210 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1211 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1212 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1214 mddev->max_disks = MD_SB_DISKS;
1216 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1217 mddev->bitmap_info.file == NULL) {
1218 mddev->bitmap_info.offset =
1219 mddev->bitmap_info.default_offset;
1220 mddev->bitmap_info.space =
1221 mddev->bitmap_info.default_space;
1224 } else if (mddev->pers == NULL) {
1225 /* Insist on good event counter while assembling, except
1226 * for spares (which don't need an event count) */
1228 if (sb->disks[rdev->desc_nr].state & (
1229 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1230 if (ev1 < mddev->events)
1232 } else if (mddev->bitmap) {
1233 /* if adding to array with a bitmap, then we can accept an
1234 * older device ... but not too old.
1236 if (ev1 < mddev->bitmap->events_cleared)
1238 if (ev1 < mddev->events)
1239 set_bit(Bitmap_sync, &rdev->flags);
1241 if (ev1 < mddev->events)
1242 /* just a hot-add of a new device, leave raid_disk at -1 */
1246 if (mddev->level != LEVEL_MULTIPATH) {
1247 desc = sb->disks + rdev->desc_nr;
1249 if (desc->state & (1<<MD_DISK_FAULTY))
1250 set_bit(Faulty, &rdev->flags);
1251 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1252 desc->raid_disk < mddev->raid_disks */) {
1253 set_bit(In_sync, &rdev->flags);
1254 rdev->raid_disk = desc->raid_disk;
1255 rdev->saved_raid_disk = desc->raid_disk;
1256 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1257 /* active but not in sync implies recovery up to
1258 * reshape position. We don't know exactly where
1259 * that is, so set to zero for now */
1260 if (mddev->minor_version >= 91) {
1261 rdev->recovery_offset = 0;
1262 rdev->raid_disk = desc->raid_disk;
1265 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1266 set_bit(WriteMostly, &rdev->flags);
1267 if (desc->state & (1<<MD_DISK_FAILFAST))
1268 set_bit(FailFast, &rdev->flags);
1269 } else /* MULTIPATH are always insync */
1270 set_bit(In_sync, &rdev->flags);
1275 * sync_super for 0.90.0
1277 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1280 struct md_rdev *rdev2;
1281 int next_spare = mddev->raid_disks;
1283 /* make rdev->sb match mddev data..
1286 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1287 * 3/ any empty disks < next_spare become removed
1289 * disks[0] gets initialised to REMOVED because
1290 * we cannot be sure from other fields if it has
1291 * been initialised or not.
1294 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1296 rdev->sb_size = MD_SB_BYTES;
1298 sb = page_address(rdev->sb_page);
1300 memset(sb, 0, sizeof(*sb));
1302 sb->md_magic = MD_SB_MAGIC;
1303 sb->major_version = mddev->major_version;
1304 sb->patch_version = mddev->patch_version;
1305 sb->gvalid_words = 0; /* ignored */
1306 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1307 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1308 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1309 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1311 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1312 sb->level = mddev->level;
1313 sb->size = mddev->dev_sectors / 2;
1314 sb->raid_disks = mddev->raid_disks;
1315 sb->md_minor = mddev->md_minor;
1316 sb->not_persistent = 0;
1317 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1319 sb->events_hi = (mddev->events>>32);
1320 sb->events_lo = (u32)mddev->events;
1322 if (mddev->reshape_position == MaxSector)
1323 sb->minor_version = 90;
1325 sb->minor_version = 91;
1326 sb->reshape_position = mddev->reshape_position;
1327 sb->new_level = mddev->new_level;
1328 sb->delta_disks = mddev->delta_disks;
1329 sb->new_layout = mddev->new_layout;
1330 sb->new_chunk = mddev->new_chunk_sectors << 9;
1332 mddev->minor_version = sb->minor_version;
1335 sb->recovery_cp = mddev->recovery_cp;
1336 sb->cp_events_hi = (mddev->events>>32);
1337 sb->cp_events_lo = (u32)mddev->events;
1338 if (mddev->recovery_cp == MaxSector)
1339 sb->state = (1<< MD_SB_CLEAN);
1341 sb->recovery_cp = 0;
1343 sb->layout = mddev->layout;
1344 sb->chunk_size = mddev->chunk_sectors << 9;
1346 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1347 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1349 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1350 rdev_for_each(rdev2, mddev) {
1353 int is_active = test_bit(In_sync, &rdev2->flags);
1355 if (rdev2->raid_disk >= 0 &&
1356 sb->minor_version >= 91)
1357 /* we have nowhere to store the recovery_offset,
1358 * but if it is not below the reshape_position,
1359 * we can piggy-back on that.
1362 if (rdev2->raid_disk < 0 ||
1363 test_bit(Faulty, &rdev2->flags))
1366 desc_nr = rdev2->raid_disk;
1368 desc_nr = next_spare++;
1369 rdev2->desc_nr = desc_nr;
1370 d = &sb->disks[rdev2->desc_nr];
1372 d->number = rdev2->desc_nr;
1373 d->major = MAJOR(rdev2->bdev->bd_dev);
1374 d->minor = MINOR(rdev2->bdev->bd_dev);
1376 d->raid_disk = rdev2->raid_disk;
1378 d->raid_disk = rdev2->desc_nr; /* compatibility */
1379 if (test_bit(Faulty, &rdev2->flags))
1380 d->state = (1<<MD_DISK_FAULTY);
1381 else if (is_active) {
1382 d->state = (1<<MD_DISK_ACTIVE);
1383 if (test_bit(In_sync, &rdev2->flags))
1384 d->state |= (1<<MD_DISK_SYNC);
1392 if (test_bit(WriteMostly, &rdev2->flags))
1393 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1394 if (test_bit(FailFast, &rdev2->flags))
1395 d->state |= (1<<MD_DISK_FAILFAST);
1397 /* now set the "removed" and "faulty" bits on any missing devices */
1398 for (i=0 ; i < mddev->raid_disks ; i++) {
1399 mdp_disk_t *d = &sb->disks[i];
1400 if (d->state == 0 && d->number == 0) {
1403 d->state = (1<<MD_DISK_REMOVED);
1404 d->state |= (1<<MD_DISK_FAULTY);
1408 sb->nr_disks = nr_disks;
1409 sb->active_disks = active;
1410 sb->working_disks = working;
1411 sb->failed_disks = failed;
1412 sb->spare_disks = spare;
1414 sb->this_disk = sb->disks[rdev->desc_nr];
1415 sb->sb_csum = calc_sb_csum(sb);
1419 * rdev_size_change for 0.90.0
1421 static unsigned long long
1422 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1424 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1425 return 0; /* component must fit device */
1426 if (rdev->mddev->bitmap_info.offset)
1427 return 0; /* can't move bitmap */
1428 rdev->sb_start = calc_dev_sboffset(rdev);
1429 if (!num_sectors || num_sectors > rdev->sb_start)
1430 num_sectors = rdev->sb_start;
1431 /* Limit to 4TB as metadata cannot record more than that.
1432 * 4TB == 2^32 KB, or 2*2^32 sectors.
1434 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1435 rdev->mddev->level >= 1)
1436 num_sectors = (sector_t)(2ULL << 32) - 2;
1438 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1440 } while (md_super_wait(rdev->mddev) < 0);
1445 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1447 /* non-zero offset changes not possible with v0.90 */
1448 return new_offset == 0;
1452 * version 1 superblock
1455 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1459 unsigned long long newcsum;
1460 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1461 __le32 *isuper = (__le32*)sb;
1463 disk_csum = sb->sb_csum;
1466 for (; size >= 4; size -= 4)
1467 newcsum += le32_to_cpu(*isuper++);
1470 newcsum += le16_to_cpu(*(__le16*) isuper);
1472 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1473 sb->sb_csum = disk_csum;
1474 return cpu_to_le32(csum);
1477 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1479 struct mdp_superblock_1 *sb;
1483 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1487 * Calculate the position of the superblock in 512byte sectors.
1488 * It is always aligned to a 4K boundary and
1489 * depeding on minor_version, it can be:
1490 * 0: At least 8K, but less than 12K, from end of device
1491 * 1: At start of device
1492 * 2: 4K from start of device.
1494 switch(minor_version) {
1496 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1498 sb_start &= ~(sector_t)(4*2-1);
1509 rdev->sb_start = sb_start;
1511 /* superblock is rarely larger than 1K, but it can be larger,
1512 * and it is safe to read 4k, so we do that
1514 ret = read_disk_sb(rdev, 4096);
1515 if (ret) return ret;
1517 sb = page_address(rdev->sb_page);
1519 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1520 sb->major_version != cpu_to_le32(1) ||
1521 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1522 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1523 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1526 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1527 pr_warn("md: invalid superblock checksum on %s\n",
1528 bdevname(rdev->bdev,b));
1531 if (le64_to_cpu(sb->data_size) < 10) {
1532 pr_warn("md: data_size too small on %s\n",
1533 bdevname(rdev->bdev,b));
1538 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1539 /* Some padding is non-zero, might be a new feature */
1542 rdev->preferred_minor = 0xffff;
1543 rdev->data_offset = le64_to_cpu(sb->data_offset);
1544 rdev->new_data_offset = rdev->data_offset;
1545 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1546 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1547 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1548 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1550 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1551 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1552 if (rdev->sb_size & bmask)
1553 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1556 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1559 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1562 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1565 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1567 if (!rdev->bb_page) {
1568 rdev->bb_page = alloc_page(GFP_KERNEL);
1572 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1573 rdev->badblocks.count == 0) {
1574 /* need to load the bad block list.
1575 * Currently we limit it to one page.
1581 int sectors = le16_to_cpu(sb->bblog_size);
1582 if (sectors > (PAGE_SIZE / 512))
1584 offset = le32_to_cpu(sb->bblog_offset);
1587 bb_sector = (long long)offset;
1588 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1589 rdev->bb_page, REQ_OP_READ, 0, true))
1591 bbp = (u64 *)page_address(rdev->bb_page);
1592 rdev->badblocks.shift = sb->bblog_shift;
1593 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1594 u64 bb = le64_to_cpu(*bbp);
1595 int count = bb & (0x3ff);
1596 u64 sector = bb >> 10;
1597 sector <<= sb->bblog_shift;
1598 count <<= sb->bblog_shift;
1601 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1604 } else if (sb->bblog_offset != 0)
1605 rdev->badblocks.shift = 0;
1607 if ((le32_to_cpu(sb->feature_map) &
1608 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1609 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1610 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1611 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1614 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1622 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1624 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1625 sb->level != refsb->level ||
1626 sb->layout != refsb->layout ||
1627 sb->chunksize != refsb->chunksize) {
1628 pr_warn("md: %s has strangely different superblock to %s\n",
1629 bdevname(rdev->bdev,b),
1630 bdevname(refdev->bdev,b2));
1633 ev1 = le64_to_cpu(sb->events);
1634 ev2 = le64_to_cpu(refsb->events);
1641 if (minor_version) {
1642 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1643 sectors -= rdev->data_offset;
1645 sectors = rdev->sb_start;
1646 if (sectors < le64_to_cpu(sb->data_size))
1648 rdev->sectors = le64_to_cpu(sb->data_size);
1652 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1654 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1655 __u64 ev1 = le64_to_cpu(sb->events);
1657 rdev->raid_disk = -1;
1658 clear_bit(Faulty, &rdev->flags);
1659 clear_bit(In_sync, &rdev->flags);
1660 clear_bit(Bitmap_sync, &rdev->flags);
1661 clear_bit(WriteMostly, &rdev->flags);
1663 if (mddev->raid_disks == 0) {
1664 mddev->major_version = 1;
1665 mddev->patch_version = 0;
1666 mddev->external = 0;
1667 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1668 mddev->ctime = le64_to_cpu(sb->ctime);
1669 mddev->utime = le64_to_cpu(sb->utime);
1670 mddev->level = le32_to_cpu(sb->level);
1671 mddev->clevel[0] = 0;
1672 mddev->layout = le32_to_cpu(sb->layout);
1673 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1674 mddev->dev_sectors = le64_to_cpu(sb->size);
1675 mddev->events = ev1;
1676 mddev->bitmap_info.offset = 0;
1677 mddev->bitmap_info.space = 0;
1678 /* Default location for bitmap is 1K after superblock
1679 * using 3K - total of 4K
1681 mddev->bitmap_info.default_offset = 1024 >> 9;
1682 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1683 mddev->reshape_backwards = 0;
1685 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1686 memcpy(mddev->uuid, sb->set_uuid, 16);
1688 mddev->max_disks = (4096-256)/2;
1690 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1691 mddev->bitmap_info.file == NULL) {
1692 mddev->bitmap_info.offset =
1693 (__s32)le32_to_cpu(sb->bitmap_offset);
1694 /* Metadata doesn't record how much space is available.
1695 * For 1.0, we assume we can use up to the superblock
1696 * if before, else to 4K beyond superblock.
1697 * For others, assume no change is possible.
1699 if (mddev->minor_version > 0)
1700 mddev->bitmap_info.space = 0;
1701 else if (mddev->bitmap_info.offset > 0)
1702 mddev->bitmap_info.space =
1703 8 - mddev->bitmap_info.offset;
1705 mddev->bitmap_info.space =
1706 -mddev->bitmap_info.offset;
1709 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1710 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1711 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1712 mddev->new_level = le32_to_cpu(sb->new_level);
1713 mddev->new_layout = le32_to_cpu(sb->new_layout);
1714 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1715 if (mddev->delta_disks < 0 ||
1716 (mddev->delta_disks == 0 &&
1717 (le32_to_cpu(sb->feature_map)
1718 & MD_FEATURE_RESHAPE_BACKWARDS)))
1719 mddev->reshape_backwards = 1;
1721 mddev->reshape_position = MaxSector;
1722 mddev->delta_disks = 0;
1723 mddev->new_level = mddev->level;
1724 mddev->new_layout = mddev->layout;
1725 mddev->new_chunk_sectors = mddev->chunk_sectors;
1728 if (mddev->level == 0 &&
1729 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1732 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1733 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1735 if (le32_to_cpu(sb->feature_map) &
1736 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1737 if (le32_to_cpu(sb->feature_map) &
1738 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1740 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1741 (le32_to_cpu(sb->feature_map) &
1742 MD_FEATURE_MULTIPLE_PPLS))
1744 set_bit(MD_HAS_PPL, &mddev->flags);
1746 } else if (mddev->pers == NULL) {
1747 /* Insist of good event counter while assembling, except for
1748 * spares (which don't need an event count) */
1750 if (rdev->desc_nr >= 0 &&
1751 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1752 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1753 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1754 if (ev1 < mddev->events)
1756 } else if (mddev->bitmap) {
1757 /* If adding to array with a bitmap, then we can accept an
1758 * older device, but not too old.
1760 if (ev1 < mddev->bitmap->events_cleared)
1762 if (ev1 < mddev->events)
1763 set_bit(Bitmap_sync, &rdev->flags);
1765 if (ev1 < mddev->events)
1766 /* just a hot-add of a new device, leave raid_disk at -1 */
1769 if (mddev->level != LEVEL_MULTIPATH) {
1771 if (rdev->desc_nr < 0 ||
1772 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1773 role = MD_DISK_ROLE_SPARE;
1776 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1778 case MD_DISK_ROLE_SPARE: /* spare */
1780 case MD_DISK_ROLE_FAULTY: /* faulty */
1781 set_bit(Faulty, &rdev->flags);
1783 case MD_DISK_ROLE_JOURNAL: /* journal device */
1784 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1785 /* journal device without journal feature */
1786 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1789 set_bit(Journal, &rdev->flags);
1790 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1791 rdev->raid_disk = 0;
1794 rdev->saved_raid_disk = role;
1795 if ((le32_to_cpu(sb->feature_map) &
1796 MD_FEATURE_RECOVERY_OFFSET)) {
1797 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1798 if (!(le32_to_cpu(sb->feature_map) &
1799 MD_FEATURE_RECOVERY_BITMAP))
1800 rdev->saved_raid_disk = -1;
1803 * If the array is FROZEN, then the device can't
1804 * be in_sync with rest of array.
1806 if (!test_bit(MD_RECOVERY_FROZEN,
1808 set_bit(In_sync, &rdev->flags);
1810 rdev->raid_disk = role;
1813 if (sb->devflags & WriteMostly1)
1814 set_bit(WriteMostly, &rdev->flags);
1815 if (sb->devflags & FailFast1)
1816 set_bit(FailFast, &rdev->flags);
1817 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1818 set_bit(Replacement, &rdev->flags);
1819 } else /* MULTIPATH are always insync */
1820 set_bit(In_sync, &rdev->flags);
1825 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1827 struct mdp_superblock_1 *sb;
1828 struct md_rdev *rdev2;
1830 /* make rdev->sb match mddev and rdev data. */
1832 sb = page_address(rdev->sb_page);
1834 sb->feature_map = 0;
1836 sb->recovery_offset = cpu_to_le64(0);
1837 memset(sb->pad3, 0, sizeof(sb->pad3));
1839 sb->utime = cpu_to_le64((__u64)mddev->utime);
1840 sb->events = cpu_to_le64(mddev->events);
1842 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1843 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1844 sb->resync_offset = cpu_to_le64(MaxSector);
1846 sb->resync_offset = cpu_to_le64(0);
1848 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1850 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1851 sb->size = cpu_to_le64(mddev->dev_sectors);
1852 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1853 sb->level = cpu_to_le32(mddev->level);
1854 sb->layout = cpu_to_le32(mddev->layout);
1855 if (test_bit(FailFast, &rdev->flags))
1856 sb->devflags |= FailFast1;
1858 sb->devflags &= ~FailFast1;
1860 if (test_bit(WriteMostly, &rdev->flags))
1861 sb->devflags |= WriteMostly1;
1863 sb->devflags &= ~WriteMostly1;
1864 sb->data_offset = cpu_to_le64(rdev->data_offset);
1865 sb->data_size = cpu_to_le64(rdev->sectors);
1867 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1868 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1869 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1872 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1873 !test_bit(In_sync, &rdev->flags)) {
1875 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1876 sb->recovery_offset =
1877 cpu_to_le64(rdev->recovery_offset);
1878 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1880 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1882 /* Note: recovery_offset and journal_tail share space */
1883 if (test_bit(Journal, &rdev->flags))
1884 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1885 if (test_bit(Replacement, &rdev->flags))
1887 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1889 if (mddev->reshape_position != MaxSector) {
1890 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1891 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1892 sb->new_layout = cpu_to_le32(mddev->new_layout);
1893 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1894 sb->new_level = cpu_to_le32(mddev->new_level);
1895 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1896 if (mddev->delta_disks == 0 &&
1897 mddev->reshape_backwards)
1899 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1900 if (rdev->new_data_offset != rdev->data_offset) {
1902 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1903 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1904 - rdev->data_offset));
1908 if (mddev_is_clustered(mddev))
1909 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1911 if (rdev->badblocks.count == 0)
1912 /* Nothing to do for bad blocks*/ ;
1913 else if (sb->bblog_offset == 0)
1914 /* Cannot record bad blocks on this device */
1915 md_error(mddev, rdev);
1917 struct badblocks *bb = &rdev->badblocks;
1918 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1920 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1925 seq = read_seqbegin(&bb->lock);
1927 memset(bbp, 0xff, PAGE_SIZE);
1929 for (i = 0 ; i < bb->count ; i++) {
1930 u64 internal_bb = p[i];
1931 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1932 | BB_LEN(internal_bb));
1933 bbp[i] = cpu_to_le64(store_bb);
1936 if (read_seqretry(&bb->lock, seq))
1939 bb->sector = (rdev->sb_start +
1940 (int)le32_to_cpu(sb->bblog_offset));
1941 bb->size = le16_to_cpu(sb->bblog_size);
1946 rdev_for_each(rdev2, mddev)
1947 if (rdev2->desc_nr+1 > max_dev)
1948 max_dev = rdev2->desc_nr+1;
1950 if (max_dev > le32_to_cpu(sb->max_dev)) {
1952 sb->max_dev = cpu_to_le32(max_dev);
1953 rdev->sb_size = max_dev * 2 + 256;
1954 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1955 if (rdev->sb_size & bmask)
1956 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1958 max_dev = le32_to_cpu(sb->max_dev);
1960 for (i=0; i<max_dev;i++)
1961 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1963 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1964 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1966 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
1967 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
1969 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
1971 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
1972 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
1973 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
1976 rdev_for_each(rdev2, mddev) {
1978 if (test_bit(Faulty, &rdev2->flags))
1979 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1980 else if (test_bit(In_sync, &rdev2->flags))
1981 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1982 else if (test_bit(Journal, &rdev2->flags))
1983 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1984 else if (rdev2->raid_disk >= 0)
1985 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1987 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1990 sb->sb_csum = calc_sb_1_csum(sb);
1993 static unsigned long long
1994 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1996 struct mdp_superblock_1 *sb;
1997 sector_t max_sectors;
1998 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1999 return 0; /* component must fit device */
2000 if (rdev->data_offset != rdev->new_data_offset)
2001 return 0; /* too confusing */
2002 if (rdev->sb_start < rdev->data_offset) {
2003 /* minor versions 1 and 2; superblock before data */
2004 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2005 max_sectors -= rdev->data_offset;
2006 if (!num_sectors || num_sectors > max_sectors)
2007 num_sectors = max_sectors;
2008 } else if (rdev->mddev->bitmap_info.offset) {
2009 /* minor version 0 with bitmap we can't move */
2012 /* minor version 0; superblock after data */
2014 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
2015 sb_start &= ~(sector_t)(4*2 - 1);
2016 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
2017 if (!num_sectors || num_sectors > max_sectors)
2018 num_sectors = max_sectors;
2019 rdev->sb_start = sb_start;
2021 sb = page_address(rdev->sb_page);
2022 sb->data_size = cpu_to_le64(num_sectors);
2023 sb->super_offset = cpu_to_le64(rdev->sb_start);
2024 sb->sb_csum = calc_sb_1_csum(sb);
2026 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2028 } while (md_super_wait(rdev->mddev) < 0);
2034 super_1_allow_new_offset(struct md_rdev *rdev,
2035 unsigned long long new_offset)
2037 /* All necessary checks on new >= old have been done */
2038 struct bitmap *bitmap;
2039 if (new_offset >= rdev->data_offset)
2042 /* with 1.0 metadata, there is no metadata to tread on
2043 * so we can always move back */
2044 if (rdev->mddev->minor_version == 0)
2047 /* otherwise we must be sure not to step on
2048 * any metadata, so stay:
2049 * 36K beyond start of superblock
2050 * beyond end of badblocks
2051 * beyond write-intent bitmap
2053 if (rdev->sb_start + (32+4)*2 > new_offset)
2055 bitmap = rdev->mddev->bitmap;
2056 if (bitmap && !rdev->mddev->bitmap_info.file &&
2057 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2058 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2060 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2066 static struct super_type super_types[] = {
2069 .owner = THIS_MODULE,
2070 .load_super = super_90_load,
2071 .validate_super = super_90_validate,
2072 .sync_super = super_90_sync,
2073 .rdev_size_change = super_90_rdev_size_change,
2074 .allow_new_offset = super_90_allow_new_offset,
2078 .owner = THIS_MODULE,
2079 .load_super = super_1_load,
2080 .validate_super = super_1_validate,
2081 .sync_super = super_1_sync,
2082 .rdev_size_change = super_1_rdev_size_change,
2083 .allow_new_offset = super_1_allow_new_offset,
2087 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2089 if (mddev->sync_super) {
2090 mddev->sync_super(mddev, rdev);
2094 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2096 super_types[mddev->major_version].sync_super(mddev, rdev);
2099 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2101 struct md_rdev *rdev, *rdev2;
2104 rdev_for_each_rcu(rdev, mddev1) {
2105 if (test_bit(Faulty, &rdev->flags) ||
2106 test_bit(Journal, &rdev->flags) ||
2107 rdev->raid_disk == -1)
2109 rdev_for_each_rcu(rdev2, mddev2) {
2110 if (test_bit(Faulty, &rdev2->flags) ||
2111 test_bit(Journal, &rdev2->flags) ||
2112 rdev2->raid_disk == -1)
2114 if (rdev->bdev->bd_contains ==
2115 rdev2->bdev->bd_contains) {
2125 static LIST_HEAD(pending_raid_disks);
2128 * Try to register data integrity profile for an mddev
2130 * This is called when an array is started and after a disk has been kicked
2131 * from the array. It only succeeds if all working and active component devices
2132 * are integrity capable with matching profiles.
2134 int md_integrity_register(struct mddev *mddev)
2136 struct md_rdev *rdev, *reference = NULL;
2138 if (list_empty(&mddev->disks))
2139 return 0; /* nothing to do */
2140 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2141 return 0; /* shouldn't register, or already is */
2142 rdev_for_each(rdev, mddev) {
2143 /* skip spares and non-functional disks */
2144 if (test_bit(Faulty, &rdev->flags))
2146 if (rdev->raid_disk < 0)
2149 /* Use the first rdev as the reference */
2153 /* does this rdev's profile match the reference profile? */
2154 if (blk_integrity_compare(reference->bdev->bd_disk,
2155 rdev->bdev->bd_disk) < 0)
2158 if (!reference || !bdev_get_integrity(reference->bdev))
2161 * All component devices are integrity capable and have matching
2162 * profiles, register the common profile for the md device.
2164 blk_integrity_register(mddev->gendisk,
2165 bdev_get_integrity(reference->bdev));
2167 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2168 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2169 pr_err("md: failed to create integrity pool for %s\n",
2175 EXPORT_SYMBOL(md_integrity_register);
2178 * Attempt to add an rdev, but only if it is consistent with the current
2181 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2183 struct blk_integrity *bi_rdev;
2184 struct blk_integrity *bi_mddev;
2185 char name[BDEVNAME_SIZE];
2187 if (!mddev->gendisk)
2190 bi_rdev = bdev_get_integrity(rdev->bdev);
2191 bi_mddev = blk_get_integrity(mddev->gendisk);
2193 if (!bi_mddev) /* nothing to do */
2196 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2197 pr_err("%s: incompatible integrity profile for %s\n",
2198 mdname(mddev), bdevname(rdev->bdev, name));
2204 EXPORT_SYMBOL(md_integrity_add_rdev);
2206 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2208 char b[BDEVNAME_SIZE];
2212 /* prevent duplicates */
2213 if (find_rdev(mddev, rdev->bdev->bd_dev))
2216 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2220 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2221 if (!test_bit(Journal, &rdev->flags) &&
2223 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2225 /* Cannot change size, so fail
2226 * If mddev->level <= 0, then we don't care
2227 * about aligning sizes (e.g. linear)
2229 if (mddev->level > 0)
2232 mddev->dev_sectors = rdev->sectors;
2235 /* Verify rdev->desc_nr is unique.
2236 * If it is -1, assign a free number, else
2237 * check number is not in use
2240 if (rdev->desc_nr < 0) {
2243 choice = mddev->raid_disks;
2244 while (md_find_rdev_nr_rcu(mddev, choice))
2246 rdev->desc_nr = choice;
2248 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2254 if (!test_bit(Journal, &rdev->flags) &&
2255 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2256 pr_warn("md: %s: array is limited to %d devices\n",
2257 mdname(mddev), mddev->max_disks);
2260 bdevname(rdev->bdev,b);
2261 strreplace(b, '/', '!');
2263 rdev->mddev = mddev;
2264 pr_debug("md: bind<%s>\n", b);
2266 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2269 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2270 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2271 /* failure here is OK */;
2272 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2274 list_add_rcu(&rdev->same_set, &mddev->disks);
2275 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2277 /* May as well allow recovery to be retried once */
2278 mddev->recovery_disabled++;
2283 pr_warn("md: failed to register dev-%s for %s\n",
2288 static void md_delayed_delete(struct work_struct *ws)
2290 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2291 kobject_del(&rdev->kobj);
2292 kobject_put(&rdev->kobj);
2295 static void unbind_rdev_from_array(struct md_rdev *rdev)
2297 char b[BDEVNAME_SIZE];
2299 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2300 list_del_rcu(&rdev->same_set);
2301 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2303 sysfs_remove_link(&rdev->kobj, "block");
2304 sysfs_put(rdev->sysfs_state);
2305 rdev->sysfs_state = NULL;
2306 rdev->badblocks.count = 0;
2307 /* We need to delay this, otherwise we can deadlock when
2308 * writing to 'remove' to "dev/state". We also need
2309 * to delay it due to rcu usage.
2312 INIT_WORK(&rdev->del_work, md_delayed_delete);
2313 kobject_get(&rdev->kobj);
2314 queue_work(md_misc_wq, &rdev->del_work);
2318 * prevent the device from being mounted, repartitioned or
2319 * otherwise reused by a RAID array (or any other kernel
2320 * subsystem), by bd_claiming the device.
2322 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2325 struct block_device *bdev;
2326 char b[BDEVNAME_SIZE];
2328 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2329 shared ? (struct md_rdev *)lock_rdev : rdev);
2331 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2332 return PTR_ERR(bdev);
2338 static void unlock_rdev(struct md_rdev *rdev)
2340 struct block_device *bdev = rdev->bdev;
2342 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2345 void md_autodetect_dev(dev_t dev);
2347 static void export_rdev(struct md_rdev *rdev)
2349 char b[BDEVNAME_SIZE];
2351 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2352 md_rdev_clear(rdev);
2354 if (test_bit(AutoDetected, &rdev->flags))
2355 md_autodetect_dev(rdev->bdev->bd_dev);
2358 kobject_put(&rdev->kobj);
2361 void md_kick_rdev_from_array(struct md_rdev *rdev)
2363 unbind_rdev_from_array(rdev);
2366 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2368 static void export_array(struct mddev *mddev)
2370 struct md_rdev *rdev;
2372 while (!list_empty(&mddev->disks)) {
2373 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2375 md_kick_rdev_from_array(rdev);
2377 mddev->raid_disks = 0;
2378 mddev->major_version = 0;
2381 static bool set_in_sync(struct mddev *mddev)
2383 WARN_ON_ONCE(NR_CPUS != 1 && !spin_is_locked(&mddev->lock));
2384 if (!mddev->in_sync) {
2385 mddev->sync_checkers++;
2386 spin_unlock(&mddev->lock);
2387 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2388 spin_lock(&mddev->lock);
2389 if (!mddev->in_sync &&
2390 percpu_ref_is_zero(&mddev->writes_pending)) {
2393 * Ensure ->in_sync is visible before we clear
2397 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2398 sysfs_notify_dirent_safe(mddev->sysfs_state);
2400 if (--mddev->sync_checkers == 0)
2401 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2403 if (mddev->safemode == 1)
2404 mddev->safemode = 0;
2405 return mddev->in_sync;
2408 static void sync_sbs(struct mddev *mddev, int nospares)
2410 /* Update each superblock (in-memory image), but
2411 * if we are allowed to, skip spares which already
2412 * have the right event counter, or have one earlier
2413 * (which would mean they aren't being marked as dirty
2414 * with the rest of the array)
2416 struct md_rdev *rdev;
2417 rdev_for_each(rdev, mddev) {
2418 if (rdev->sb_events == mddev->events ||
2420 rdev->raid_disk < 0 &&
2421 rdev->sb_events+1 == mddev->events)) {
2422 /* Don't update this superblock */
2423 rdev->sb_loaded = 2;
2425 sync_super(mddev, rdev);
2426 rdev->sb_loaded = 1;
2431 static bool does_sb_need_changing(struct mddev *mddev)
2433 struct md_rdev *rdev = NULL, *iter;
2434 struct mdp_superblock_1 *sb;
2437 /* Find a good rdev */
2438 rdev_for_each(iter, mddev)
2439 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2444 /* No good device found. */
2448 sb = page_address(rdev->sb_page);
2449 /* Check if a device has become faulty or a spare become active */
2450 rdev_for_each(rdev, mddev) {
2451 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2452 /* Device activated? */
2453 if (role == 0xffff && rdev->raid_disk >=0 &&
2454 !test_bit(Faulty, &rdev->flags))
2456 /* Device turned faulty? */
2457 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2461 /* Check if any mddev parameters have changed */
2462 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2463 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2464 (mddev->layout != le32_to_cpu(sb->layout)) ||
2465 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2466 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2472 void md_update_sb(struct mddev *mddev, int force_change)
2474 struct md_rdev *rdev;
2477 int any_badblocks_changed = 0;
2482 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2487 if (mddev_is_clustered(mddev)) {
2488 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2490 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2492 ret = md_cluster_ops->metadata_update_start(mddev);
2493 /* Has someone else has updated the sb */
2494 if (!does_sb_need_changing(mddev)) {
2496 md_cluster_ops->metadata_update_cancel(mddev);
2497 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2498 BIT(MD_SB_CHANGE_DEVS) |
2499 BIT(MD_SB_CHANGE_CLEAN));
2504 /* First make sure individual recovery_offsets are correct */
2505 rdev_for_each(rdev, mddev) {
2506 if (rdev->raid_disk >= 0 &&
2507 mddev->delta_disks >= 0 &&
2508 !test_bit(Journal, &rdev->flags) &&
2509 !test_bit(In_sync, &rdev->flags) &&
2510 mddev->curr_resync_completed > rdev->recovery_offset)
2511 rdev->recovery_offset = mddev->curr_resync_completed;
2514 if (!mddev->persistent) {
2515 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2516 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2517 if (!mddev->external) {
2518 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2519 rdev_for_each(rdev, mddev) {
2520 if (rdev->badblocks.changed) {
2521 rdev->badblocks.changed = 0;
2522 ack_all_badblocks(&rdev->badblocks);
2523 md_error(mddev, rdev);
2525 clear_bit(Blocked, &rdev->flags);
2526 clear_bit(BlockedBadBlocks, &rdev->flags);
2527 wake_up(&rdev->blocked_wait);
2530 wake_up(&mddev->sb_wait);
2534 spin_lock(&mddev->lock);
2536 mddev->utime = ktime_get_real_seconds();
2538 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2540 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2541 /* just a clean<-> dirty transition, possibly leave spares alone,
2542 * though if events isn't the right even/odd, we will have to do
2548 if (mddev->degraded)
2549 /* If the array is degraded, then skipping spares is both
2550 * dangerous and fairly pointless.
2551 * Dangerous because a device that was removed from the array
2552 * might have a event_count that still looks up-to-date,
2553 * so it can be re-added without a resync.
2554 * Pointless because if there are any spares to skip,
2555 * then a recovery will happen and soon that array won't
2556 * be degraded any more and the spare can go back to sleep then.
2560 sync_req = mddev->in_sync;
2562 /* If this is just a dirty<->clean transition, and the array is clean
2563 * and 'events' is odd, we can roll back to the previous clean state */
2565 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2566 && mddev->can_decrease_events
2567 && mddev->events != 1) {
2569 mddev->can_decrease_events = 0;
2571 /* otherwise we have to go forward and ... */
2573 mddev->can_decrease_events = nospares;
2577 * This 64-bit counter should never wrap.
2578 * Either we are in around ~1 trillion A.C., assuming
2579 * 1 reboot per second, or we have a bug...
2581 WARN_ON(mddev->events == 0);
2583 rdev_for_each(rdev, mddev) {
2584 if (rdev->badblocks.changed)
2585 any_badblocks_changed++;
2586 if (test_bit(Faulty, &rdev->flags))
2587 set_bit(FaultRecorded, &rdev->flags);
2590 sync_sbs(mddev, nospares);
2591 spin_unlock(&mddev->lock);
2593 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2594 mdname(mddev), mddev->in_sync);
2597 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2599 bitmap_update_sb(mddev->bitmap);
2600 rdev_for_each(rdev, mddev) {
2601 char b[BDEVNAME_SIZE];
2603 if (rdev->sb_loaded != 1)
2604 continue; /* no noise on spare devices */
2606 if (!test_bit(Faulty, &rdev->flags)) {
2607 md_super_write(mddev,rdev,
2608 rdev->sb_start, rdev->sb_size,
2610 pr_debug("md: (write) %s's sb offset: %llu\n",
2611 bdevname(rdev->bdev, b),
2612 (unsigned long long)rdev->sb_start);
2613 rdev->sb_events = mddev->events;
2614 if (rdev->badblocks.size) {
2615 md_super_write(mddev, rdev,
2616 rdev->badblocks.sector,
2617 rdev->badblocks.size << 9,
2619 rdev->badblocks.size = 0;
2623 pr_debug("md: %s (skipping faulty)\n",
2624 bdevname(rdev->bdev, b));
2626 if (mddev->level == LEVEL_MULTIPATH)
2627 /* only need to write one superblock... */
2630 if (md_super_wait(mddev) < 0)
2632 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2634 if (mddev_is_clustered(mddev) && ret == 0)
2635 md_cluster_ops->metadata_update_finish(mddev);
2637 if (mddev->in_sync != sync_req ||
2638 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2639 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2640 /* have to write it out again */
2642 wake_up(&mddev->sb_wait);
2643 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2644 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2646 rdev_for_each(rdev, mddev) {
2647 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2648 clear_bit(Blocked, &rdev->flags);
2650 if (any_badblocks_changed)
2651 ack_all_badblocks(&rdev->badblocks);
2652 clear_bit(BlockedBadBlocks, &rdev->flags);
2653 wake_up(&rdev->blocked_wait);
2656 EXPORT_SYMBOL(md_update_sb);
2658 static int add_bound_rdev(struct md_rdev *rdev)
2660 struct mddev *mddev = rdev->mddev;
2662 bool add_journal = test_bit(Journal, &rdev->flags);
2664 if (!mddev->pers->hot_remove_disk || add_journal) {
2665 /* If there is hot_add_disk but no hot_remove_disk
2666 * then added disks for geometry changes,
2667 * and should be added immediately.
2669 super_types[mddev->major_version].
2670 validate_super(mddev, rdev);
2672 mddev_suspend(mddev);
2673 err = mddev->pers->hot_add_disk(mddev, rdev);
2675 mddev_resume(mddev);
2677 md_kick_rdev_from_array(rdev);
2681 sysfs_notify_dirent_safe(rdev->sysfs_state);
2683 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2684 if (mddev->degraded)
2685 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2686 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2687 md_new_event(mddev);
2688 md_wakeup_thread(mddev->thread);
2692 /* words written to sysfs files may, or may not, be \n terminated.
2693 * We want to accept with case. For this we use cmd_match.
2695 static int cmd_match(const char *cmd, const char *str)
2697 /* See if cmd, written into a sysfs file, matches
2698 * str. They must either be the same, or cmd can
2699 * have a trailing newline
2701 while (*cmd && *str && *cmd == *str) {
2712 struct rdev_sysfs_entry {
2713 struct attribute attr;
2714 ssize_t (*show)(struct md_rdev *, char *);
2715 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2719 state_show(struct md_rdev *rdev, char *page)
2723 unsigned long flags = ACCESS_ONCE(rdev->flags);
2725 if (test_bit(Faulty, &flags) ||
2726 (!test_bit(ExternalBbl, &flags) &&
2727 rdev->badblocks.unacked_exist))
2728 len += sprintf(page+len, "faulty%s", sep);
2729 if (test_bit(In_sync, &flags))
2730 len += sprintf(page+len, "in_sync%s", sep);
2731 if (test_bit(Journal, &flags))
2732 len += sprintf(page+len, "journal%s", sep);
2733 if (test_bit(WriteMostly, &flags))
2734 len += sprintf(page+len, "write_mostly%s", sep);
2735 if (test_bit(Blocked, &flags) ||
2736 (rdev->badblocks.unacked_exist
2737 && !test_bit(Faulty, &flags)))
2738 len += sprintf(page+len, "blocked%s", sep);
2739 if (!test_bit(Faulty, &flags) &&
2740 !test_bit(Journal, &flags) &&
2741 !test_bit(In_sync, &flags))
2742 len += sprintf(page+len, "spare%s", sep);
2743 if (test_bit(WriteErrorSeen, &flags))
2744 len += sprintf(page+len, "write_error%s", sep);
2745 if (test_bit(WantReplacement, &flags))
2746 len += sprintf(page+len, "want_replacement%s", sep);
2747 if (test_bit(Replacement, &flags))
2748 len += sprintf(page+len, "replacement%s", sep);
2749 if (test_bit(ExternalBbl, &flags))
2750 len += sprintf(page+len, "external_bbl%s", sep);
2751 if (test_bit(FailFast, &flags))
2752 len += sprintf(page+len, "failfast%s", sep);
2757 return len+sprintf(page+len, "\n");
2761 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2764 * faulty - simulates an error
2765 * remove - disconnects the device
2766 * writemostly - sets write_mostly
2767 * -writemostly - clears write_mostly
2768 * blocked - sets the Blocked flags
2769 * -blocked - clears the Blocked and possibly simulates an error
2770 * insync - sets Insync providing device isn't active
2771 * -insync - clear Insync for a device with a slot assigned,
2772 * so that it gets rebuilt based on bitmap
2773 * write_error - sets WriteErrorSeen
2774 * -write_error - clears WriteErrorSeen
2775 * {,-}failfast - set/clear FailFast
2778 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2779 md_error(rdev->mddev, rdev);
2780 if (test_bit(Faulty, &rdev->flags))
2784 } else if (cmd_match(buf, "remove")) {
2785 if (rdev->mddev->pers) {
2786 clear_bit(Blocked, &rdev->flags);
2787 remove_and_add_spares(rdev->mddev, rdev);
2789 if (rdev->raid_disk >= 0)
2792 struct mddev *mddev = rdev->mddev;
2794 if (mddev_is_clustered(mddev))
2795 err = md_cluster_ops->remove_disk(mddev, rdev);
2798 md_kick_rdev_from_array(rdev);
2800 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2801 md_wakeup_thread(mddev->thread);
2803 md_new_event(mddev);
2806 } else if (cmd_match(buf, "writemostly")) {
2807 set_bit(WriteMostly, &rdev->flags);
2809 } else if (cmd_match(buf, "-writemostly")) {
2810 clear_bit(WriteMostly, &rdev->flags);
2812 } else if (cmd_match(buf, "blocked")) {
2813 set_bit(Blocked, &rdev->flags);
2815 } else if (cmd_match(buf, "-blocked")) {
2816 if (!test_bit(Faulty, &rdev->flags) &&
2817 !test_bit(ExternalBbl, &rdev->flags) &&
2818 rdev->badblocks.unacked_exist) {
2819 /* metadata handler doesn't understand badblocks,
2820 * so we need to fail the device
2822 md_error(rdev->mddev, rdev);
2824 clear_bit(Blocked, &rdev->flags);
2825 clear_bit(BlockedBadBlocks, &rdev->flags);
2826 wake_up(&rdev->blocked_wait);
2827 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2828 md_wakeup_thread(rdev->mddev->thread);
2831 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2832 set_bit(In_sync, &rdev->flags);
2834 } else if (cmd_match(buf, "failfast")) {
2835 set_bit(FailFast, &rdev->flags);
2837 } else if (cmd_match(buf, "-failfast")) {
2838 clear_bit(FailFast, &rdev->flags);
2840 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2841 !test_bit(Journal, &rdev->flags)) {
2842 if (rdev->mddev->pers == NULL) {
2843 clear_bit(In_sync, &rdev->flags);
2844 rdev->saved_raid_disk = rdev->raid_disk;
2845 rdev->raid_disk = -1;
2848 } else if (cmd_match(buf, "write_error")) {
2849 set_bit(WriteErrorSeen, &rdev->flags);
2851 } else if (cmd_match(buf, "-write_error")) {
2852 clear_bit(WriteErrorSeen, &rdev->flags);
2854 } else if (cmd_match(buf, "want_replacement")) {
2855 /* Any non-spare device that is not a replacement can
2856 * become want_replacement at any time, but we then need to
2857 * check if recovery is needed.
2859 if (rdev->raid_disk >= 0 &&
2860 !test_bit(Journal, &rdev->flags) &&
2861 !test_bit(Replacement, &rdev->flags))
2862 set_bit(WantReplacement, &rdev->flags);
2863 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2864 md_wakeup_thread(rdev->mddev->thread);
2866 } else if (cmd_match(buf, "-want_replacement")) {
2867 /* Clearing 'want_replacement' is always allowed.
2868 * Once replacements starts it is too late though.
2871 clear_bit(WantReplacement, &rdev->flags);
2872 } else if (cmd_match(buf, "replacement")) {
2873 /* Can only set a device as a replacement when array has not
2874 * yet been started. Once running, replacement is automatic
2875 * from spares, or by assigning 'slot'.
2877 if (rdev->mddev->pers)
2880 set_bit(Replacement, &rdev->flags);
2883 } else if (cmd_match(buf, "-replacement")) {
2884 /* Similarly, can only clear Replacement before start */
2885 if (rdev->mddev->pers)
2888 clear_bit(Replacement, &rdev->flags);
2891 } else if (cmd_match(buf, "re-add")) {
2892 if (!rdev->mddev->pers)
2894 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2895 rdev->saved_raid_disk >= 0) {
2896 /* clear_bit is performed _after_ all the devices
2897 * have their local Faulty bit cleared. If any writes
2898 * happen in the meantime in the local node, they
2899 * will land in the local bitmap, which will be synced
2900 * by this node eventually
2902 if (!mddev_is_clustered(rdev->mddev) ||
2903 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2904 clear_bit(Faulty, &rdev->flags);
2905 err = add_bound_rdev(rdev);
2909 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2910 set_bit(ExternalBbl, &rdev->flags);
2911 rdev->badblocks.shift = 0;
2913 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2914 clear_bit(ExternalBbl, &rdev->flags);
2918 sysfs_notify_dirent_safe(rdev->sysfs_state);
2919 return err ? err : len;
2921 static struct rdev_sysfs_entry rdev_state =
2922 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2925 errors_show(struct md_rdev *rdev, char *page)
2927 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2931 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2936 rv = kstrtouint(buf, 10, &n);
2939 atomic_set(&rdev->corrected_errors, n);
2942 static struct rdev_sysfs_entry rdev_errors =
2943 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2946 slot_show(struct md_rdev *rdev, char *page)
2948 if (test_bit(Journal, &rdev->flags))
2949 return sprintf(page, "journal\n");
2950 else if (rdev->raid_disk < 0)
2951 return sprintf(page, "none\n");
2953 return sprintf(page, "%d\n", rdev->raid_disk);
2957 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2962 if (test_bit(Journal, &rdev->flags))
2964 if (strncmp(buf, "none", 4)==0)
2967 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2974 if (rdev->mddev->pers && slot == -1) {
2975 /* Setting 'slot' on an active array requires also
2976 * updating the 'rd%d' link, and communicating
2977 * with the personality with ->hot_*_disk.
2978 * For now we only support removing
2979 * failed/spare devices. This normally happens automatically,
2980 * but not when the metadata is externally managed.
2982 if (rdev->raid_disk == -1)
2984 /* personality does all needed checks */
2985 if (rdev->mddev->pers->hot_remove_disk == NULL)
2987 clear_bit(Blocked, &rdev->flags);
2988 remove_and_add_spares(rdev->mddev, rdev);
2989 if (rdev->raid_disk >= 0)
2991 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2992 md_wakeup_thread(rdev->mddev->thread);
2993 } else if (rdev->mddev->pers) {
2994 /* Activating a spare .. or possibly reactivating
2995 * if we ever get bitmaps working here.
2999 if (rdev->raid_disk != -1)
3002 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3005 if (rdev->mddev->pers->hot_add_disk == NULL)
3008 if (slot >= rdev->mddev->raid_disks &&
3009 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3012 rdev->raid_disk = slot;
3013 if (test_bit(In_sync, &rdev->flags))
3014 rdev->saved_raid_disk = slot;
3016 rdev->saved_raid_disk = -1;
3017 clear_bit(In_sync, &rdev->flags);
3018 clear_bit(Bitmap_sync, &rdev->flags);
3019 err = rdev->mddev->pers->
3020 hot_add_disk(rdev->mddev, rdev);
3022 rdev->raid_disk = -1;
3025 sysfs_notify_dirent_safe(rdev->sysfs_state);
3026 if (sysfs_link_rdev(rdev->mddev, rdev))
3027 /* failure here is OK */;
3028 /* don't wakeup anyone, leave that to userspace. */
3030 if (slot >= rdev->mddev->raid_disks &&
3031 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3033 rdev->raid_disk = slot;
3034 /* assume it is working */
3035 clear_bit(Faulty, &rdev->flags);
3036 clear_bit(WriteMostly, &rdev->flags);
3037 set_bit(In_sync, &rdev->flags);
3038 sysfs_notify_dirent_safe(rdev->sysfs_state);
3043 static struct rdev_sysfs_entry rdev_slot =
3044 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3047 offset_show(struct md_rdev *rdev, char *page)
3049 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3053 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3055 unsigned long long offset;
3056 if (kstrtoull(buf, 10, &offset) < 0)
3058 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3060 if (rdev->sectors && rdev->mddev->external)
3061 /* Must set offset before size, so overlap checks
3064 rdev->data_offset = offset;
3065 rdev->new_data_offset = offset;
3069 static struct rdev_sysfs_entry rdev_offset =
3070 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3072 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3074 return sprintf(page, "%llu\n",
3075 (unsigned long long)rdev->new_data_offset);
3078 static ssize_t new_offset_store(struct md_rdev *rdev,
3079 const char *buf, size_t len)
3081 unsigned long long new_offset;
3082 struct mddev *mddev = rdev->mddev;
3084 if (kstrtoull(buf, 10, &new_offset) < 0)
3087 if (mddev->sync_thread ||
3088 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3090 if (new_offset == rdev->data_offset)
3091 /* reset is always permitted */
3093 else if (new_offset > rdev->data_offset) {
3094 /* must not push array size beyond rdev_sectors */
3095 if (new_offset - rdev->data_offset
3096 + mddev->dev_sectors > rdev->sectors)
3099 /* Metadata worries about other space details. */
3101 /* decreasing the offset is inconsistent with a backwards
3104 if (new_offset < rdev->data_offset &&
3105 mddev->reshape_backwards)
3107 /* Increasing offset is inconsistent with forwards
3108 * reshape. reshape_direction should be set to
3109 * 'backwards' first.
3111 if (new_offset > rdev->data_offset &&
3112 !mddev->reshape_backwards)
3115 if (mddev->pers && mddev->persistent &&
3116 !super_types[mddev->major_version]
3117 .allow_new_offset(rdev, new_offset))
3119 rdev->new_data_offset = new_offset;
3120 if (new_offset > rdev->data_offset)
3121 mddev->reshape_backwards = 1;
3122 else if (new_offset < rdev->data_offset)
3123 mddev->reshape_backwards = 0;
3127 static struct rdev_sysfs_entry rdev_new_offset =
3128 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3131 rdev_size_show(struct md_rdev *rdev, char *page)
3133 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3136 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3138 /* check if two start/length pairs overlap */
3146 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3148 unsigned long long blocks;
3151 if (kstrtoull(buf, 10, &blocks) < 0)
3154 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3155 return -EINVAL; /* sector conversion overflow */
3158 if (new != blocks * 2)
3159 return -EINVAL; /* unsigned long long to sector_t overflow */
3166 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3168 struct mddev *my_mddev = rdev->mddev;
3169 sector_t oldsectors = rdev->sectors;
3172 if (test_bit(Journal, &rdev->flags))
3174 if (strict_blocks_to_sectors(buf, §ors) < 0)
3176 if (rdev->data_offset != rdev->new_data_offset)
3177 return -EINVAL; /* too confusing */
3178 if (my_mddev->pers && rdev->raid_disk >= 0) {
3179 if (my_mddev->persistent) {
3180 sectors = super_types[my_mddev->major_version].
3181 rdev_size_change(rdev, sectors);
3184 } else if (!sectors)
3185 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3187 if (!my_mddev->pers->resize)
3188 /* Cannot change size for RAID0 or Linear etc */
3191 if (sectors < my_mddev->dev_sectors)
3192 return -EINVAL; /* component must fit device */
3194 rdev->sectors = sectors;
3195 if (sectors > oldsectors && my_mddev->external) {
3196 /* Need to check that all other rdevs with the same
3197 * ->bdev do not overlap. 'rcu' is sufficient to walk
3198 * the rdev lists safely.
3199 * This check does not provide a hard guarantee, it
3200 * just helps avoid dangerous mistakes.
3202 struct mddev *mddev;
3204 struct list_head *tmp;
3207 for_each_mddev(mddev, tmp) {
3208 struct md_rdev *rdev2;
3210 rdev_for_each(rdev2, mddev)
3211 if (rdev->bdev == rdev2->bdev &&
3213 overlaps(rdev->data_offset, rdev->sectors,
3226 /* Someone else could have slipped in a size
3227 * change here, but doing so is just silly.
3228 * We put oldsectors back because we *know* it is
3229 * safe, and trust userspace not to race with
3232 rdev->sectors = oldsectors;
3239 static struct rdev_sysfs_entry rdev_size =
3240 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3242 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3244 unsigned long long recovery_start = rdev->recovery_offset;
3246 if (test_bit(In_sync, &rdev->flags) ||
3247 recovery_start == MaxSector)
3248 return sprintf(page, "none\n");
3250 return sprintf(page, "%llu\n", recovery_start);
3253 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3255 unsigned long long recovery_start;
3257 if (cmd_match(buf, "none"))
3258 recovery_start = MaxSector;
3259 else if (kstrtoull(buf, 10, &recovery_start))
3262 if (rdev->mddev->pers &&
3263 rdev->raid_disk >= 0)
3266 rdev->recovery_offset = recovery_start;
3267 if (recovery_start == MaxSector)
3268 set_bit(In_sync, &rdev->flags);
3270 clear_bit(In_sync, &rdev->flags);
3274 static struct rdev_sysfs_entry rdev_recovery_start =
3275 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3277 /* sysfs access to bad-blocks list.
3278 * We present two files.
3279 * 'bad-blocks' lists sector numbers and lengths of ranges that
3280 * are recorded as bad. The list is truncated to fit within
3281 * the one-page limit of sysfs.
3282 * Writing "sector length" to this file adds an acknowledged
3284 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3285 * been acknowledged. Writing to this file adds bad blocks
3286 * without acknowledging them. This is largely for testing.
3288 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3290 return badblocks_show(&rdev->badblocks, page, 0);
3292 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3294 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3295 /* Maybe that ack was all we needed */
3296 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3297 wake_up(&rdev->blocked_wait);
3300 static struct rdev_sysfs_entry rdev_bad_blocks =
3301 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3303 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3305 return badblocks_show(&rdev->badblocks, page, 1);
3307 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3309 return badblocks_store(&rdev->badblocks, page, len, 1);
3311 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3312 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3315 ppl_sector_show(struct md_rdev *rdev, char *page)
3317 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3321 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3323 unsigned long long sector;
3325 if (kstrtoull(buf, 10, §or) < 0)
3327 if (sector != (sector_t)sector)
3330 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3331 rdev->raid_disk >= 0)
3334 if (rdev->mddev->persistent) {
3335 if (rdev->mddev->major_version == 0)
3337 if ((sector > rdev->sb_start &&
3338 sector - rdev->sb_start > S16_MAX) ||
3339 (sector < rdev->sb_start &&
3340 rdev->sb_start - sector > -S16_MIN))
3342 rdev->ppl.offset = sector - rdev->sb_start;
3343 } else if (!rdev->mddev->external) {
3346 rdev->ppl.sector = sector;
3350 static struct rdev_sysfs_entry rdev_ppl_sector =
3351 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3354 ppl_size_show(struct md_rdev *rdev, char *page)
3356 return sprintf(page, "%u\n", rdev->ppl.size);
3360 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3364 if (kstrtouint(buf, 10, &size) < 0)
3367 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3368 rdev->raid_disk >= 0)
3371 if (rdev->mddev->persistent) {
3372 if (rdev->mddev->major_version == 0)
3376 } else if (!rdev->mddev->external) {
3379 rdev->ppl.size = size;
3383 static struct rdev_sysfs_entry rdev_ppl_size =
3384 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3386 static struct attribute *rdev_default_attrs[] = {
3391 &rdev_new_offset.attr,
3393 &rdev_recovery_start.attr,
3394 &rdev_bad_blocks.attr,
3395 &rdev_unack_bad_blocks.attr,
3396 &rdev_ppl_sector.attr,
3397 &rdev_ppl_size.attr,
3401 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3403 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3404 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3410 return entry->show(rdev, page);
3414 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3415 const char *page, size_t length)
3417 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3418 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3420 struct mddev *mddev = rdev->mddev;
3424 if (!capable(CAP_SYS_ADMIN))
3426 rv = mddev ? mddev_lock(mddev): -EBUSY;
3428 if (rdev->mddev == NULL)
3431 rv = entry->store(rdev, page, length);
3432 mddev_unlock(mddev);
3437 static void rdev_free(struct kobject *ko)
3439 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3442 static const struct sysfs_ops rdev_sysfs_ops = {
3443 .show = rdev_attr_show,
3444 .store = rdev_attr_store,
3446 static struct kobj_type rdev_ktype = {
3447 .release = rdev_free,
3448 .sysfs_ops = &rdev_sysfs_ops,
3449 .default_attrs = rdev_default_attrs,
3452 int md_rdev_init(struct md_rdev *rdev)
3455 rdev->saved_raid_disk = -1;
3456 rdev->raid_disk = -1;
3458 rdev->data_offset = 0;
3459 rdev->new_data_offset = 0;
3460 rdev->sb_events = 0;
3461 rdev->last_read_error = 0;
3462 rdev->sb_loaded = 0;
3463 rdev->bb_page = NULL;
3464 atomic_set(&rdev->nr_pending, 0);
3465 atomic_set(&rdev->read_errors, 0);
3466 atomic_set(&rdev->corrected_errors, 0);
3468 INIT_LIST_HEAD(&rdev->same_set);
3469 init_waitqueue_head(&rdev->blocked_wait);
3471 /* Add space to store bad block list.
3472 * This reserves the space even on arrays where it cannot
3473 * be used - I wonder if that matters
3475 return badblocks_init(&rdev->badblocks, 0);
3477 EXPORT_SYMBOL_GPL(md_rdev_init);
3479 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3481 * mark the device faulty if:
3483 * - the device is nonexistent (zero size)
3484 * - the device has no valid superblock
3486 * a faulty rdev _never_ has rdev->sb set.
3488 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3490 char b[BDEVNAME_SIZE];
3492 struct md_rdev *rdev;
3495 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3497 return ERR_PTR(-ENOMEM);
3499 err = md_rdev_init(rdev);
3502 err = alloc_disk_sb(rdev);
3506 err = lock_rdev(rdev, newdev, super_format == -2);
3510 kobject_init(&rdev->kobj, &rdev_ktype);
3512 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3514 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3515 bdevname(rdev->bdev,b));
3520 if (super_format >= 0) {
3521 err = super_types[super_format].
3522 load_super(rdev, NULL, super_minor);
3523 if (err == -EINVAL) {
3524 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3525 bdevname(rdev->bdev,b),
3526 super_format, super_minor);
3530 pr_warn("md: could not read %s's sb, not importing!\n",
3531 bdevname(rdev->bdev,b));
3541 md_rdev_clear(rdev);
3543 return ERR_PTR(err);
3547 * Check a full RAID array for plausibility
3550 static void analyze_sbs(struct mddev *mddev)
3553 struct md_rdev *rdev, *freshest, *tmp;
3554 char b[BDEVNAME_SIZE];
3557 rdev_for_each_safe(rdev, tmp, mddev)
3558 switch (super_types[mddev->major_version].
3559 load_super(rdev, freshest, mddev->minor_version)) {
3566 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3567 bdevname(rdev->bdev,b));
3568 md_kick_rdev_from_array(rdev);
3571 super_types[mddev->major_version].
3572 validate_super(mddev, freshest);
3575 rdev_for_each_safe(rdev, tmp, mddev) {
3576 if (mddev->max_disks &&
3577 (rdev->desc_nr >= mddev->max_disks ||
3578 i > mddev->max_disks)) {
3579 pr_warn("md: %s: %s: only %d devices permitted\n",
3580 mdname(mddev), bdevname(rdev->bdev, b),
3582 md_kick_rdev_from_array(rdev);
3585 if (rdev != freshest) {
3586 if (super_types[mddev->major_version].
3587 validate_super(mddev, rdev)) {
3588 pr_warn("md: kicking non-fresh %s from array!\n",
3589 bdevname(rdev->bdev,b));
3590 md_kick_rdev_from_array(rdev);
3594 if (mddev->level == LEVEL_MULTIPATH) {
3595 rdev->desc_nr = i++;
3596 rdev->raid_disk = rdev->desc_nr;
3597 set_bit(In_sync, &rdev->flags);
3598 } else if (rdev->raid_disk >=
3599 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3600 !test_bit(Journal, &rdev->flags)) {
3601 rdev->raid_disk = -1;
3602 clear_bit(In_sync, &rdev->flags);
3607 /* Read a fixed-point number.
3608 * Numbers in sysfs attributes should be in "standard" units where
3609 * possible, so time should be in seconds.
3610 * However we internally use a a much smaller unit such as
3611 * milliseconds or jiffies.
3612 * This function takes a decimal number with a possible fractional
3613 * component, and produces an integer which is the result of
3614 * multiplying that number by 10^'scale'.
3615 * all without any floating-point arithmetic.
3617 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3619 unsigned long result = 0;
3621 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3624 else if (decimals < scale) {
3627 result = result * 10 + value;
3639 while (decimals < scale) {
3648 safe_delay_show(struct mddev *mddev, char *page)
3650 int msec = (mddev->safemode_delay*1000)/HZ;
3651 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3654 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3658 if (mddev_is_clustered(mddev)) {
3659 pr_warn("md: Safemode is disabled for clustered mode\n");
3663 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3666 mddev->safemode_delay = 0;
3668 unsigned long old_delay = mddev->safemode_delay;
3669 unsigned long new_delay = (msec*HZ)/1000;
3673 mddev->safemode_delay = new_delay;
3674 if (new_delay < old_delay || old_delay == 0)
3675 mod_timer(&mddev->safemode_timer, jiffies+1);
3679 static struct md_sysfs_entry md_safe_delay =
3680 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3683 level_show(struct mddev *mddev, char *page)
3685 struct md_personality *p;
3687 spin_lock(&mddev->lock);
3690 ret = sprintf(page, "%s\n", p->name);
3691 else if (mddev->clevel[0])
3692 ret = sprintf(page, "%s\n", mddev->clevel);
3693 else if (mddev->level != LEVEL_NONE)
3694 ret = sprintf(page, "%d\n", mddev->level);
3697 spin_unlock(&mddev->lock);
3702 level_store(struct mddev *mddev, const char *buf, size_t len)
3707 struct md_personality *pers, *oldpers;
3709 void *priv, *oldpriv;
3710 struct md_rdev *rdev;
3712 if (slen == 0 || slen >= sizeof(clevel))
3715 rv = mddev_lock(mddev);
3719 if (mddev->pers == NULL) {
3720 strncpy(mddev->clevel, buf, slen);
3721 if (mddev->clevel[slen-1] == '\n')
3723 mddev->clevel[slen] = 0;
3724 mddev->level = LEVEL_NONE;
3732 /* request to change the personality. Need to ensure:
3733 * - array is not engaged in resync/recovery/reshape
3734 * - old personality can be suspended
3735 * - new personality will access other array.
3739 if (mddev->sync_thread ||
3740 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3741 mddev->reshape_position != MaxSector ||
3742 mddev->sysfs_active)
3746 if (!mddev->pers->quiesce) {
3747 pr_warn("md: %s: %s does not support online personality change\n",
3748 mdname(mddev), mddev->pers->name);
3752 /* Now find the new personality */
3753 strncpy(clevel, buf, slen);
3754 if (clevel[slen-1] == '\n')
3757 if (kstrtol(clevel, 10, &level))
3760 if (request_module("md-%s", clevel) != 0)
3761 request_module("md-level-%s", clevel);
3762 spin_lock(&pers_lock);
3763 pers = find_pers(level, clevel);
3764 if (!pers || !try_module_get(pers->owner)) {
3765 spin_unlock(&pers_lock);
3766 pr_warn("md: personality %s not loaded\n", clevel);
3770 spin_unlock(&pers_lock);
3772 if (pers == mddev->pers) {
3773 /* Nothing to do! */
3774 module_put(pers->owner);
3778 if (!pers->takeover) {
3779 module_put(pers->owner);
3780 pr_warn("md: %s: %s does not support personality takeover\n",
3781 mdname(mddev), clevel);
3786 rdev_for_each(rdev, mddev)
3787 rdev->new_raid_disk = rdev->raid_disk;
3789 /* ->takeover must set new_* and/or delta_disks
3790 * if it succeeds, and may set them when it fails.
3792 priv = pers->takeover(mddev);
3794 mddev->new_level = mddev->level;
3795 mddev->new_layout = mddev->layout;
3796 mddev->new_chunk_sectors = mddev->chunk_sectors;
3797 mddev->raid_disks -= mddev->delta_disks;
3798 mddev->delta_disks = 0;
3799 mddev->reshape_backwards = 0;
3800 module_put(pers->owner);
3801 pr_warn("md: %s: %s would not accept array\n",
3802 mdname(mddev), clevel);
3807 /* Looks like we have a winner */
3808 mddev_suspend(mddev);
3809 mddev_detach(mddev);
3811 spin_lock(&mddev->lock);
3812 oldpers = mddev->pers;
3813 oldpriv = mddev->private;
3815 mddev->private = priv;
3816 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3817 mddev->level = mddev->new_level;
3818 mddev->layout = mddev->new_layout;
3819 mddev->chunk_sectors = mddev->new_chunk_sectors;
3820 mddev->delta_disks = 0;
3821 mddev->reshape_backwards = 0;
3822 mddev->degraded = 0;
3823 spin_unlock(&mddev->lock);
3825 if (oldpers->sync_request == NULL &&
3827 /* We are converting from a no-redundancy array
3828 * to a redundancy array and metadata is managed
3829 * externally so we need to be sure that writes
3830 * won't block due to a need to transition
3832 * until external management is started.
3835 mddev->safemode_delay = 0;
3836 mddev->safemode = 0;
3839 oldpers->free(mddev, oldpriv);
3841 if (oldpers->sync_request == NULL &&
3842 pers->sync_request != NULL) {
3843 /* need to add the md_redundancy_group */
3844 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3845 pr_warn("md: cannot register extra attributes for %s\n",
3847 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3849 if (oldpers->sync_request != NULL &&
3850 pers->sync_request == NULL) {
3851 /* need to remove the md_redundancy_group */
3852 if (mddev->to_remove == NULL)
3853 mddev->to_remove = &md_redundancy_group;
3856 module_put(oldpers->owner);
3858 rdev_for_each(rdev, mddev) {
3859 if (rdev->raid_disk < 0)
3861 if (rdev->new_raid_disk >= mddev->raid_disks)
3862 rdev->new_raid_disk = -1;
3863 if (rdev->new_raid_disk == rdev->raid_disk)
3865 sysfs_unlink_rdev(mddev, rdev);
3867 rdev_for_each(rdev, mddev) {
3868 if (rdev->raid_disk < 0)
3870 if (rdev->new_raid_disk == rdev->raid_disk)
3872 rdev->raid_disk = rdev->new_raid_disk;
3873 if (rdev->raid_disk < 0)
3874 clear_bit(In_sync, &rdev->flags);
3876 if (sysfs_link_rdev(mddev, rdev))
3877 pr_warn("md: cannot register rd%d for %s after level change\n",
3878 rdev->raid_disk, mdname(mddev));
3882 if (pers->sync_request == NULL) {
3883 /* this is now an array without redundancy, so
3884 * it must always be in_sync
3887 del_timer_sync(&mddev->safemode_timer);
3889 blk_set_stacking_limits(&mddev->queue->limits);
3891 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3892 mddev_resume(mddev);
3894 md_update_sb(mddev, 1);
3895 sysfs_notify(&mddev->kobj, NULL, "level");
3896 md_new_event(mddev);
3899 mddev_unlock(mddev);
3903 static struct md_sysfs_entry md_level =
3904 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3907 layout_show(struct mddev *mddev, char *page)
3909 /* just a number, not meaningful for all levels */
3910 if (mddev->reshape_position != MaxSector &&
3911 mddev->layout != mddev->new_layout)
3912 return sprintf(page, "%d (%d)\n",
3913 mddev->new_layout, mddev->layout);
3914 return sprintf(page, "%d\n", mddev->layout);
3918 layout_store(struct mddev *mddev, const char *buf, size_t len)
3923 err = kstrtouint(buf, 10, &n);
3926 err = mddev_lock(mddev);
3931 if (mddev->pers->check_reshape == NULL)
3936 mddev->new_layout = n;
3937 err = mddev->pers->check_reshape(mddev);
3939 mddev->new_layout = mddev->layout;
3942 mddev->new_layout = n;
3943 if (mddev->reshape_position == MaxSector)
3946 mddev_unlock(mddev);
3949 static struct md_sysfs_entry md_layout =
3950 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3953 raid_disks_show(struct mddev *mddev, char *page)
3955 if (mddev->raid_disks == 0)
3957 if (mddev->reshape_position != MaxSector &&
3958 mddev->delta_disks != 0)
3959 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3960 mddev->raid_disks - mddev->delta_disks);
3961 return sprintf(page, "%d\n", mddev->raid_disks);
3964 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3967 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3972 err = kstrtouint(buf, 10, &n);
3976 err = mddev_lock(mddev);
3980 err = update_raid_disks(mddev, n);
3981 else if (mddev->reshape_position != MaxSector) {
3982 struct md_rdev *rdev;
3983 int olddisks = mddev->raid_disks - mddev->delta_disks;
3986 rdev_for_each(rdev, mddev) {
3988 rdev->data_offset < rdev->new_data_offset)
3991 rdev->data_offset > rdev->new_data_offset)
3995 mddev->delta_disks = n - olddisks;
3996 mddev->raid_disks = n;
3997 mddev->reshape_backwards = (mddev->delta_disks < 0);
3999 mddev->raid_disks = n;
4001 mddev_unlock(mddev);
4002 return err ? err : len;
4004 static struct md_sysfs_entry md_raid_disks =
4005 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4008 chunk_size_show(struct mddev *mddev, char *page)
4010 if (mddev->reshape_position != MaxSector &&
4011 mddev->chunk_sectors != mddev->new_chunk_sectors)
4012 return sprintf(page, "%d (%d)\n",
4013 mddev->new_chunk_sectors << 9,
4014 mddev->chunk_sectors << 9);
4015 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4019 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4024 err = kstrtoul(buf, 10, &n);
4028 err = mddev_lock(mddev);
4032 if (mddev->pers->check_reshape == NULL)
4037 mddev->new_chunk_sectors = n >> 9;
4038 err = mddev->pers->check_reshape(mddev);
4040 mddev->new_chunk_sectors = mddev->chunk_sectors;
4043 mddev->new_chunk_sectors = n >> 9;
4044 if (mddev->reshape_position == MaxSector)
4045 mddev->chunk_sectors = n >> 9;
4047 mddev_unlock(mddev);
4050 static struct md_sysfs_entry md_chunk_size =
4051 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4054 resync_start_show(struct mddev *mddev, char *page)
4056 if (mddev->recovery_cp == MaxSector)
4057 return sprintf(page, "none\n");
4058 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4062 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4064 unsigned long long n;
4067 if (cmd_match(buf, "none"))
4070 err = kstrtoull(buf, 10, &n);
4073 if (n != (sector_t)n)
4077 err = mddev_lock(mddev);
4080 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4084 mddev->recovery_cp = n;
4086 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4088 mddev_unlock(mddev);
4091 static struct md_sysfs_entry md_resync_start =
4092 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4093 resync_start_show, resync_start_store);
4096 * The array state can be:
4099 * No devices, no size, no level
4100 * Equivalent to STOP_ARRAY ioctl
4102 * May have some settings, but array is not active
4103 * all IO results in error
4104 * When written, doesn't tear down array, but just stops it
4105 * suspended (not supported yet)
4106 * All IO requests will block. The array can be reconfigured.
4107 * Writing this, if accepted, will block until array is quiescent
4109 * no resync can happen. no superblocks get written.
4110 * write requests fail
4112 * like readonly, but behaves like 'clean' on a write request.
4114 * clean - no pending writes, but otherwise active.
4115 * When written to inactive array, starts without resync
4116 * If a write request arrives then
4117 * if metadata is known, mark 'dirty' and switch to 'active'.
4118 * if not known, block and switch to write-pending
4119 * If written to an active array that has pending writes, then fails.
4121 * fully active: IO and resync can be happening.
4122 * When written to inactive array, starts with resync
4125 * clean, but writes are blocked waiting for 'active' to be written.
4128 * like active, but no writes have been seen for a while (100msec).
4131 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4132 write_pending, active_idle, bad_word};
4133 static char *array_states[] = {
4134 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4135 "write-pending", "active-idle", NULL };
4137 static int match_word(const char *word, char **list)
4140 for (n=0; list[n]; n++)
4141 if (cmd_match(word, list[n]))
4147 array_state_show(struct mddev *mddev, char *page)
4149 enum array_state st = inactive;
4151 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags))
4160 spin_lock(&mddev->lock);
4161 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4163 else if (mddev->in_sync)
4165 else if (mddev->safemode)
4169 spin_unlock(&mddev->lock);
4172 if (list_empty(&mddev->disks) &&
4173 mddev->raid_disks == 0 &&
4174 mddev->dev_sectors == 0)
4179 return sprintf(page, "%s\n", array_states[st]);
4182 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4183 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4184 static int do_md_run(struct mddev *mddev);
4185 static int restart_array(struct mddev *mddev);
4188 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4191 enum array_state st = match_word(buf, array_states);
4193 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4194 /* don't take reconfig_mutex when toggling between
4197 spin_lock(&mddev->lock);
4199 restart_array(mddev);
4200 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4201 md_wakeup_thread(mddev->thread);
4202 wake_up(&mddev->sb_wait);
4203 } else /* st == clean */ {
4204 restart_array(mddev);
4205 if (!set_in_sync(mddev))
4209 sysfs_notify_dirent_safe(mddev->sysfs_state);
4210 spin_unlock(&mddev->lock);
4213 err = mddev_lock(mddev);
4221 /* stopping an active array */
4222 err = do_md_stop(mddev, 0, NULL);
4225 /* stopping an active array */
4227 err = do_md_stop(mddev, 2, NULL);
4229 err = 0; /* already inactive */
4232 break; /* not supported yet */
4235 err = md_set_readonly(mddev, NULL);
4238 set_disk_ro(mddev->gendisk, 1);
4239 err = do_md_run(mddev);
4245 err = md_set_readonly(mddev, NULL);
4246 else if (mddev->ro == 1)
4247 err = restart_array(mddev);
4250 set_disk_ro(mddev->gendisk, 0);
4254 err = do_md_run(mddev);
4259 err = restart_array(mddev);
4262 spin_lock(&mddev->lock);
4263 if (!set_in_sync(mddev))
4265 spin_unlock(&mddev->lock);
4271 err = restart_array(mddev);
4274 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4275 wake_up(&mddev->sb_wait);
4279 set_disk_ro(mddev->gendisk, 0);
4280 err = do_md_run(mddev);
4285 /* these cannot be set */
4290 if (mddev->hold_active == UNTIL_IOCTL)
4291 mddev->hold_active = 0;
4292 sysfs_notify_dirent_safe(mddev->sysfs_state);
4294 mddev_unlock(mddev);
4297 static struct md_sysfs_entry md_array_state =
4298 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4301 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4302 return sprintf(page, "%d\n",
4303 atomic_read(&mddev->max_corr_read_errors));
4307 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4312 rv = kstrtouint(buf, 10, &n);
4315 atomic_set(&mddev->max_corr_read_errors, n);
4319 static struct md_sysfs_entry max_corr_read_errors =
4320 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4321 max_corrected_read_errors_store);
4324 null_show(struct mddev *mddev, char *page)
4330 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4332 /* buf must be %d:%d\n? giving major and minor numbers */
4333 /* The new device is added to the array.
4334 * If the array has a persistent superblock, we read the
4335 * superblock to initialise info and check validity.
4336 * Otherwise, only checking done is that in bind_rdev_to_array,
4337 * which mainly checks size.
4340 int major = simple_strtoul(buf, &e, 10);
4343 struct md_rdev *rdev;
4346 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4348 minor = simple_strtoul(e+1, &e, 10);
4349 if (*e && *e != '\n')
4351 dev = MKDEV(major, minor);
4352 if (major != MAJOR(dev) ||
4353 minor != MINOR(dev))
4356 flush_workqueue(md_misc_wq);
4358 err = mddev_lock(mddev);
4361 if (mddev->persistent) {
4362 rdev = md_import_device(dev, mddev->major_version,
4363 mddev->minor_version);
4364 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4365 struct md_rdev *rdev0
4366 = list_entry(mddev->disks.next,
4367 struct md_rdev, same_set);
4368 err = super_types[mddev->major_version]
4369 .load_super(rdev, rdev0, mddev->minor_version);
4373 } else if (mddev->external)
4374 rdev = md_import_device(dev, -2, -1);
4376 rdev = md_import_device(dev, -1, -1);
4379 mddev_unlock(mddev);
4380 return PTR_ERR(rdev);
4382 err = bind_rdev_to_array(rdev, mddev);
4386 mddev_unlock(mddev);
4388 md_new_event(mddev);
4389 return err ? err : len;
4392 static struct md_sysfs_entry md_new_device =
4393 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4396 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4399 unsigned long chunk, end_chunk;
4402 err = mddev_lock(mddev);
4407 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4409 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4410 if (buf == end) break;
4411 if (*end == '-') { /* range */
4413 end_chunk = simple_strtoul(buf, &end, 0);
4414 if (buf == end) break;
4416 if (*end && !isspace(*end)) break;
4417 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4418 buf = skip_spaces(end);
4420 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4422 mddev_unlock(mddev);
4426 static struct md_sysfs_entry md_bitmap =
4427 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4430 size_show(struct mddev *mddev, char *page)
4432 return sprintf(page, "%llu\n",
4433 (unsigned long long)mddev->dev_sectors / 2);
4436 static int update_size(struct mddev *mddev, sector_t num_sectors);
4439 size_store(struct mddev *mddev, const char *buf, size_t len)
4441 /* If array is inactive, we can reduce the component size, but
4442 * not increase it (except from 0).
4443 * If array is active, we can try an on-line resize
4446 int err = strict_blocks_to_sectors(buf, §ors);
4450 err = mddev_lock(mddev);
4454 err = update_size(mddev, sectors);
4456 md_update_sb(mddev, 1);
4458 if (mddev->dev_sectors == 0 ||
4459 mddev->dev_sectors > sectors)
4460 mddev->dev_sectors = sectors;
4464 mddev_unlock(mddev);
4465 return err ? err : len;
4468 static struct md_sysfs_entry md_size =
4469 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4471 /* Metadata version.
4473 * 'none' for arrays with no metadata (good luck...)
4474 * 'external' for arrays with externally managed metadata,
4475 * or N.M for internally known formats
4478 metadata_show(struct mddev *mddev, char *page)
4480 if (mddev->persistent)
4481 return sprintf(page, "%d.%d\n",
4482 mddev->major_version, mddev->minor_version);
4483 else if (mddev->external)
4484 return sprintf(page, "external:%s\n", mddev->metadata_type);
4486 return sprintf(page, "none\n");
4490 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4495 /* Changing the details of 'external' metadata is
4496 * always permitted. Otherwise there must be
4497 * no devices attached to the array.
4500 err = mddev_lock(mddev);
4504 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4506 else if (!list_empty(&mddev->disks))
4510 if (cmd_match(buf, "none")) {
4511 mddev->persistent = 0;
4512 mddev->external = 0;
4513 mddev->major_version = 0;
4514 mddev->minor_version = 90;
4517 if (strncmp(buf, "external:", 9) == 0) {
4518 size_t namelen = len-9;
4519 if (namelen >= sizeof(mddev->metadata_type))
4520 namelen = sizeof(mddev->metadata_type)-1;
4521 strncpy(mddev->metadata_type, buf+9, namelen);
4522 mddev->metadata_type[namelen] = 0;
4523 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4524 mddev->metadata_type[--namelen] = 0;
4525 mddev->persistent = 0;
4526 mddev->external = 1;
4527 mddev->major_version = 0;
4528 mddev->minor_version = 90;
4531 major = simple_strtoul(buf, &e, 10);
4533 if (e==buf || *e != '.')
4536 minor = simple_strtoul(buf, &e, 10);
4537 if (e==buf || (*e && *e != '\n') )
4540 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4542 mddev->major_version = major;
4543 mddev->minor_version = minor;
4544 mddev->persistent = 1;
4545 mddev->external = 0;
4548 mddev_unlock(mddev);
4552 static struct md_sysfs_entry md_metadata =
4553 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4556 action_show(struct mddev *mddev, char *page)
4558 char *type = "idle";
4559 unsigned long recovery = mddev->recovery;
4560 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4562 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4563 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4564 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4566 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4567 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4569 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4573 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4575 else if (mddev->reshape_position != MaxSector)
4578 return sprintf(page, "%s\n", type);
4582 action_store(struct mddev *mddev, const char *page, size_t len)
4584 if (!mddev->pers || !mddev->pers->sync_request)
4588 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4589 if (cmd_match(page, "frozen"))
4590 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4592 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4593 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4594 mddev_lock(mddev) == 0) {
4595 flush_workqueue(md_misc_wq);
4596 if (mddev->sync_thread) {
4597 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4598 md_reap_sync_thread(mddev);
4600 mddev_unlock(mddev);
4602 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4604 else if (cmd_match(page, "resync"))
4605 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4606 else if (cmd_match(page, "recover")) {
4607 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4608 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4609 } else if (cmd_match(page, "reshape")) {
4611 if (mddev->pers->start_reshape == NULL)
4613 err = mddev_lock(mddev);
4615 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4618 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4619 err = mddev->pers->start_reshape(mddev);
4621 mddev_unlock(mddev);
4625 sysfs_notify(&mddev->kobj, NULL, "degraded");
4627 if (cmd_match(page, "check"))
4628 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4629 else if (!cmd_match(page, "repair"))
4631 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4632 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4633 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4635 if (mddev->ro == 2) {
4636 /* A write to sync_action is enough to justify
4637 * canceling read-auto mode
4640 md_wakeup_thread(mddev->sync_thread);
4642 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4643 md_wakeup_thread(mddev->thread);
4644 sysfs_notify_dirent_safe(mddev->sysfs_action);
4648 static struct md_sysfs_entry md_scan_mode =
4649 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4652 last_sync_action_show(struct mddev *mddev, char *page)
4654 return sprintf(page, "%s\n", mddev->last_sync_action);
4657 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4660 mismatch_cnt_show(struct mddev *mddev, char *page)
4662 return sprintf(page, "%llu\n",
4663 (unsigned long long)
4664 atomic64_read(&mddev->resync_mismatches));
4667 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4670 sync_min_show(struct mddev *mddev, char *page)
4672 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4673 mddev->sync_speed_min ? "local": "system");
4677 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4682 if (strncmp(buf, "system", 6)==0) {
4685 rv = kstrtouint(buf, 10, &min);
4691 mddev->sync_speed_min = min;
4695 static struct md_sysfs_entry md_sync_min =
4696 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4699 sync_max_show(struct mddev *mddev, char *page)
4701 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4702 mddev->sync_speed_max ? "local": "system");
4706 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4711 if (strncmp(buf, "system", 6)==0) {
4714 rv = kstrtouint(buf, 10, &max);
4720 mddev->sync_speed_max = max;
4724 static struct md_sysfs_entry md_sync_max =
4725 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4728 degraded_show(struct mddev *mddev, char *page)
4730 return sprintf(page, "%d\n", mddev->degraded);
4732 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4735 sync_force_parallel_show(struct mddev *mddev, char *page)
4737 return sprintf(page, "%d\n", mddev->parallel_resync);
4741 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4745 if (kstrtol(buf, 10, &n))
4748 if (n != 0 && n != 1)
4751 mddev->parallel_resync = n;
4753 if (mddev->sync_thread)
4754 wake_up(&resync_wait);
4759 /* force parallel resync, even with shared block devices */
4760 static struct md_sysfs_entry md_sync_force_parallel =
4761 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4762 sync_force_parallel_show, sync_force_parallel_store);
4765 sync_speed_show(struct mddev *mddev, char *page)
4767 unsigned long resync, dt, db;
4768 if (mddev->curr_resync == 0)
4769 return sprintf(page, "none\n");
4770 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4771 dt = (jiffies - mddev->resync_mark) / HZ;
4773 db = resync - mddev->resync_mark_cnt;
4774 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4777 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4780 sync_completed_show(struct mddev *mddev, char *page)
4782 unsigned long long max_sectors, resync;
4784 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4785 return sprintf(page, "none\n");
4787 if (mddev->curr_resync == 1 ||
4788 mddev->curr_resync == 2)
4789 return sprintf(page, "delayed\n");
4791 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4792 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4793 max_sectors = mddev->resync_max_sectors;
4795 max_sectors = mddev->dev_sectors;
4797 resync = mddev->curr_resync_completed;
4798 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4801 static struct md_sysfs_entry md_sync_completed =
4802 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4805 min_sync_show(struct mddev *mddev, char *page)
4807 return sprintf(page, "%llu\n",
4808 (unsigned long long)mddev->resync_min);
4811 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4813 unsigned long long min;
4816 if (kstrtoull(buf, 10, &min))
4819 spin_lock(&mddev->lock);
4821 if (min > mddev->resync_max)
4825 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4828 /* Round down to multiple of 4K for safety */
4829 mddev->resync_min = round_down(min, 8);
4833 spin_unlock(&mddev->lock);
4837 static struct md_sysfs_entry md_min_sync =
4838 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4841 max_sync_show(struct mddev *mddev, char *page)
4843 if (mddev->resync_max == MaxSector)
4844 return sprintf(page, "max\n");
4846 return sprintf(page, "%llu\n",
4847 (unsigned long long)mddev->resync_max);
4850 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4853 spin_lock(&mddev->lock);
4854 if (strncmp(buf, "max", 3) == 0)
4855 mddev->resync_max = MaxSector;
4857 unsigned long long max;
4861 if (kstrtoull(buf, 10, &max))
4863 if (max < mddev->resync_min)
4867 if (max < mddev->resync_max &&
4869 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4872 /* Must be a multiple of chunk_size */
4873 chunk = mddev->chunk_sectors;
4875 sector_t temp = max;
4878 if (sector_div(temp, chunk))
4881 mddev->resync_max = max;
4883 wake_up(&mddev->recovery_wait);
4886 spin_unlock(&mddev->lock);
4890 static struct md_sysfs_entry md_max_sync =
4891 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4894 suspend_lo_show(struct mddev *mddev, char *page)
4896 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4900 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4902 unsigned long long new;
4905 err = kstrtoull(buf, 10, &new);
4908 if (new != (sector_t)new)
4911 err = mddev_lock(mddev);
4915 if (mddev->pers == NULL ||
4916 mddev->pers->quiesce == NULL)
4918 mddev_suspend(mddev);
4919 mddev->suspend_lo = new;
4920 mddev_resume(mddev);
4924 mddev_unlock(mddev);
4927 static struct md_sysfs_entry md_suspend_lo =
4928 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4931 suspend_hi_show(struct mddev *mddev, char *page)
4933 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4937 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4939 unsigned long long new;
4942 err = kstrtoull(buf, 10, &new);
4945 if (new != (sector_t)new)
4948 err = mddev_lock(mddev);
4952 if (mddev->pers == NULL)
4955 mddev_suspend(mddev);
4956 mddev->suspend_hi = new;
4957 mddev_resume(mddev);
4961 mddev_unlock(mddev);
4964 static struct md_sysfs_entry md_suspend_hi =
4965 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4968 reshape_position_show(struct mddev *mddev, char *page)
4970 if (mddev->reshape_position != MaxSector)
4971 return sprintf(page, "%llu\n",
4972 (unsigned long long)mddev->reshape_position);
4973 strcpy(page, "none\n");
4978 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4980 struct md_rdev *rdev;
4981 unsigned long long new;
4984 err = kstrtoull(buf, 10, &new);
4987 if (new != (sector_t)new)
4989 err = mddev_lock(mddev);
4995 mddev->reshape_position = new;
4996 mddev->delta_disks = 0;
4997 mddev->reshape_backwards = 0;
4998 mddev->new_level = mddev->level;
4999 mddev->new_layout = mddev->layout;
5000 mddev->new_chunk_sectors = mddev->chunk_sectors;
5001 rdev_for_each(rdev, mddev)
5002 rdev->new_data_offset = rdev->data_offset;
5005 mddev_unlock(mddev);
5009 static struct md_sysfs_entry md_reshape_position =
5010 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5011 reshape_position_store);
5014 reshape_direction_show(struct mddev *mddev, char *page)
5016 return sprintf(page, "%s\n",
5017 mddev->reshape_backwards ? "backwards" : "forwards");
5021 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5026 if (cmd_match(buf, "forwards"))
5028 else if (cmd_match(buf, "backwards"))
5032 if (mddev->reshape_backwards == backwards)
5035 err = mddev_lock(mddev);
5038 /* check if we are allowed to change */
5039 if (mddev->delta_disks)
5041 else if (mddev->persistent &&
5042 mddev->major_version == 0)
5045 mddev->reshape_backwards = backwards;
5046 mddev_unlock(mddev);
5050 static struct md_sysfs_entry md_reshape_direction =
5051 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5052 reshape_direction_store);
5055 array_size_show(struct mddev *mddev, char *page)
5057 if (mddev->external_size)
5058 return sprintf(page, "%llu\n",
5059 (unsigned long long)mddev->array_sectors/2);
5061 return sprintf(page, "default\n");
5065 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5070 err = mddev_lock(mddev);
5074 /* cluster raid doesn't support change array_sectors */
5075 if (mddev_is_clustered(mddev)) {
5076 mddev_unlock(mddev);
5080 if (strncmp(buf, "default", 7) == 0) {
5082 sectors = mddev->pers->size(mddev, 0, 0);
5084 sectors = mddev->array_sectors;
5086 mddev->external_size = 0;
5088 if (strict_blocks_to_sectors(buf, §ors) < 0)
5090 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5093 mddev->external_size = 1;
5097 mddev->array_sectors = sectors;
5099 set_capacity(mddev->gendisk, mddev->array_sectors);
5100 revalidate_disk(mddev->gendisk);
5103 mddev_unlock(mddev);
5107 static struct md_sysfs_entry md_array_size =
5108 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5112 consistency_policy_show(struct mddev *mddev, char *page)
5116 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5117 ret = sprintf(page, "journal\n");
5118 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5119 ret = sprintf(page, "ppl\n");
5120 } else if (mddev->bitmap) {
5121 ret = sprintf(page, "bitmap\n");
5122 } else if (mddev->pers) {
5123 if (mddev->pers->sync_request)
5124 ret = sprintf(page, "resync\n");
5126 ret = sprintf(page, "none\n");
5128 ret = sprintf(page, "unknown\n");
5135 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5140 if (mddev->pers->change_consistency_policy)
5141 err = mddev->pers->change_consistency_policy(mddev, buf);
5144 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5145 set_bit(MD_HAS_PPL, &mddev->flags);
5150 return err ? err : len;
5153 static struct md_sysfs_entry md_consistency_policy =
5154 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5155 consistency_policy_store);
5157 static struct attribute *md_default_attrs[] = {
5160 &md_raid_disks.attr,
5161 &md_chunk_size.attr,
5163 &md_resync_start.attr,
5165 &md_new_device.attr,
5166 &md_safe_delay.attr,
5167 &md_array_state.attr,
5168 &md_reshape_position.attr,
5169 &md_reshape_direction.attr,
5170 &md_array_size.attr,
5171 &max_corr_read_errors.attr,
5172 &md_consistency_policy.attr,
5176 static struct attribute *md_redundancy_attrs[] = {
5178 &md_last_scan_mode.attr,
5179 &md_mismatches.attr,
5182 &md_sync_speed.attr,
5183 &md_sync_force_parallel.attr,
5184 &md_sync_completed.attr,
5187 &md_suspend_lo.attr,
5188 &md_suspend_hi.attr,
5193 static struct attribute_group md_redundancy_group = {
5195 .attrs = md_redundancy_attrs,
5199 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5201 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5202 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5207 spin_lock(&all_mddevs_lock);
5208 if (list_empty(&mddev->all_mddevs)) {
5209 spin_unlock(&all_mddevs_lock);
5213 spin_unlock(&all_mddevs_lock);
5215 rv = entry->show(mddev, page);
5221 md_attr_store(struct kobject *kobj, struct attribute *attr,
5222 const char *page, size_t length)
5224 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5225 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5230 if (!capable(CAP_SYS_ADMIN))
5232 spin_lock(&all_mddevs_lock);
5233 if (list_empty(&mddev->all_mddevs)) {
5234 spin_unlock(&all_mddevs_lock);
5238 spin_unlock(&all_mddevs_lock);
5239 rv = entry->store(mddev, page, length);
5244 static void md_free(struct kobject *ko)
5246 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5248 if (mddev->sysfs_state)
5249 sysfs_put(mddev->sysfs_state);
5252 blk_cleanup_queue(mddev->queue);
5253 if (mddev->gendisk) {
5254 del_gendisk(mddev->gendisk);
5255 put_disk(mddev->gendisk);
5257 percpu_ref_exit(&mddev->writes_pending);
5262 static const struct sysfs_ops md_sysfs_ops = {
5263 .show = md_attr_show,
5264 .store = md_attr_store,
5266 static struct kobj_type md_ktype = {
5268 .sysfs_ops = &md_sysfs_ops,
5269 .default_attrs = md_default_attrs,
5274 static void mddev_delayed_delete(struct work_struct *ws)
5276 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5278 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5279 kobject_del(&mddev->kobj);
5280 kobject_put(&mddev->kobj);
5283 static void no_op(struct percpu_ref *r) {}
5285 int mddev_init_writes_pending(struct mddev *mddev)
5287 if (mddev->writes_pending.percpu_count_ptr)
5289 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5291 /* We want to start with the refcount at zero */
5292 percpu_ref_put(&mddev->writes_pending);
5295 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5297 static int md_alloc(dev_t dev, char *name)
5300 * If dev is zero, name is the name of a device to allocate with
5301 * an arbitrary minor number. It will be "md_???"
5302 * If dev is non-zero it must be a device number with a MAJOR of
5303 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5304 * the device is being created by opening a node in /dev.
5305 * If "name" is not NULL, the device is being created by
5306 * writing to /sys/module/md_mod/parameters/new_array.
5308 static DEFINE_MUTEX(disks_mutex);
5309 struct mddev *mddev = mddev_find_or_alloc(dev);
5310 struct gendisk *disk;
5319 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5320 shift = partitioned ? MdpMinorShift : 0;
5321 unit = MINOR(mddev->unit) >> shift;
5323 /* wait for any previous instance of this device to be
5324 * completely removed (mddev_delayed_delete).
5326 flush_workqueue(md_misc_wq);
5328 mutex_lock(&disks_mutex);
5334 /* Need to ensure that 'name' is not a duplicate.
5336 struct mddev *mddev2;
5337 spin_lock(&all_mddevs_lock);
5339 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5340 if (mddev2->gendisk &&
5341 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5342 spin_unlock(&all_mddevs_lock);
5345 spin_unlock(&all_mddevs_lock);
5349 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5351 mddev->hold_active = UNTIL_STOP;
5354 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5357 mddev->queue->queuedata = mddev;
5359 blk_queue_make_request(mddev->queue, md_make_request);
5360 blk_set_stacking_limits(&mddev->queue->limits);
5362 disk = alloc_disk(1 << shift);
5364 blk_cleanup_queue(mddev->queue);
5365 mddev->queue = NULL;
5368 disk->major = MAJOR(mddev->unit);
5369 disk->first_minor = unit << shift;
5371 strcpy(disk->disk_name, name);
5372 else if (partitioned)
5373 sprintf(disk->disk_name, "md_d%d", unit);
5375 sprintf(disk->disk_name, "md%d", unit);
5376 disk->fops = &md_fops;
5377 disk->private_data = mddev;
5378 disk->queue = mddev->queue;
5379 blk_queue_write_cache(mddev->queue, true, true);
5380 /* Allow extended partitions. This makes the
5381 * 'mdp' device redundant, but we can't really
5384 disk->flags |= GENHD_FL_EXT_DEVT;
5385 mddev->gendisk = disk;
5388 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5389 &disk_to_dev(disk)->kobj, "%s", "md");
5391 /* This isn't possible, but as kobject_init_and_add is marked
5392 * __must_check, we must do something with the result
5394 pr_debug("md: cannot register %s/md - name in use\n",
5398 if (mddev->kobj.sd &&
5399 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5400 pr_debug("pointless warning\n");
5402 mutex_unlock(&disks_mutex);
5403 if (!error && mddev->kobj.sd) {
5404 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5405 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5411 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5414 md_alloc(dev, NULL);
5418 static int add_named_array(const char *val, struct kernel_param *kp)
5421 * val must be "md_*" or "mdNNN".
5422 * For "md_*" we allocate an array with a large free minor number, and
5423 * set the name to val. val must not already be an active name.
5424 * For "mdNNN" we allocate an array with the minor number NNN
5425 * which must not already be in use.
5427 int len = strlen(val);
5428 char buf[DISK_NAME_LEN];
5429 unsigned long devnum;
5431 while (len && val[len-1] == '\n')
5433 if (len >= DISK_NAME_LEN)
5435 strlcpy(buf, val, len+1);
5436 if (strncmp(buf, "md_", 3) == 0)
5437 return md_alloc(0, buf);
5438 if (strncmp(buf, "md", 2) == 0 &&
5440 kstrtoul(buf+2, 10, &devnum) == 0 &&
5441 devnum <= MINORMASK)
5442 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5447 static void md_safemode_timeout(unsigned long data)
5449 struct mddev *mddev = (struct mddev *) data;
5451 mddev->safemode = 1;
5452 if (mddev->external)
5453 sysfs_notify_dirent_safe(mddev->sysfs_state);
5455 md_wakeup_thread(mddev->thread);
5458 static int start_dirty_degraded;
5460 int md_run(struct mddev *mddev)
5463 struct md_rdev *rdev;
5464 struct md_personality *pers;
5466 if (list_empty(&mddev->disks))
5467 /* cannot run an array with no devices.. */
5472 /* Cannot run until previous stop completes properly */
5473 if (mddev->sysfs_active)
5477 * Analyze all RAID superblock(s)
5479 if (!mddev->raid_disks) {
5480 if (!mddev->persistent)
5485 if (mddev->level != LEVEL_NONE)
5486 request_module("md-level-%d", mddev->level);
5487 else if (mddev->clevel[0])
5488 request_module("md-%s", mddev->clevel);
5491 * Drop all container device buffers, from now on
5492 * the only valid external interface is through the md
5495 mddev->has_superblocks = false;
5496 rdev_for_each(rdev, mddev) {
5497 if (test_bit(Faulty, &rdev->flags))
5499 sync_blockdev(rdev->bdev);
5500 invalidate_bdev(rdev->bdev);
5501 if (mddev->ro != 1 &&
5502 (bdev_read_only(rdev->bdev) ||
5503 bdev_read_only(rdev->meta_bdev))) {
5506 set_disk_ro(mddev->gendisk, 1);
5510 mddev->has_superblocks = true;
5512 /* perform some consistency tests on the device.
5513 * We don't want the data to overlap the metadata,
5514 * Internal Bitmap issues have been handled elsewhere.
5516 if (rdev->meta_bdev) {
5517 /* Nothing to check */;
5518 } else if (rdev->data_offset < rdev->sb_start) {
5519 if (mddev->dev_sectors &&
5520 rdev->data_offset + mddev->dev_sectors
5522 pr_warn("md: %s: data overlaps metadata\n",
5527 if (rdev->sb_start + rdev->sb_size/512
5528 > rdev->data_offset) {
5529 pr_warn("md: %s: metadata overlaps data\n",
5534 sysfs_notify_dirent_safe(rdev->sysfs_state);
5537 if (mddev->bio_set == NULL) {
5538 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5539 if (!mddev->bio_set)
5542 if (mddev->sync_set == NULL) {
5543 mddev->sync_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5544 if (!mddev->sync_set) {
5550 spin_lock(&pers_lock);
5551 pers = find_pers(mddev->level, mddev->clevel);
5552 if (!pers || !try_module_get(pers->owner)) {
5553 spin_unlock(&pers_lock);
5554 if (mddev->level != LEVEL_NONE)
5555 pr_warn("md: personality for level %d is not loaded!\n",
5558 pr_warn("md: personality for level %s is not loaded!\n",
5563 spin_unlock(&pers_lock);
5564 if (mddev->level != pers->level) {
5565 mddev->level = pers->level;
5566 mddev->new_level = pers->level;
5568 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5570 if (mddev->reshape_position != MaxSector &&
5571 pers->start_reshape == NULL) {
5572 /* This personality cannot handle reshaping... */
5573 module_put(pers->owner);
5578 if (pers->sync_request) {
5579 /* Warn if this is a potentially silly
5582 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5583 struct md_rdev *rdev2;
5586 rdev_for_each(rdev, mddev)
5587 rdev_for_each(rdev2, mddev) {
5589 rdev->bdev->bd_contains ==
5590 rdev2->bdev->bd_contains) {
5591 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5593 bdevname(rdev->bdev,b),
5594 bdevname(rdev2->bdev,b2));
5600 pr_warn("True protection against single-disk failure might be compromised.\n");
5603 mddev->recovery = 0;
5604 /* may be over-ridden by personality */
5605 mddev->resync_max_sectors = mddev->dev_sectors;
5607 mddev->ok_start_degraded = start_dirty_degraded;
5609 if (start_readonly && mddev->ro == 0)
5610 mddev->ro = 2; /* read-only, but switch on first write */
5613 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5614 * up mddev->thread. It is important to initialize critical
5615 * resources for mddev->thread BEFORE calling pers->run().
5617 err = pers->run(mddev);
5619 pr_warn("md: pers->run() failed ...\n");
5620 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5621 WARN_ONCE(!mddev->external_size,
5622 "%s: default size too small, but 'external_size' not in effect?\n",
5624 pr_warn("md: invalid array_size %llu > default size %llu\n",
5625 (unsigned long long)mddev->array_sectors / 2,
5626 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5629 if (err == 0 && pers->sync_request &&
5630 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5631 struct bitmap *bitmap;
5633 bitmap = bitmap_create(mddev, -1);
5634 if (IS_ERR(bitmap)) {
5635 err = PTR_ERR(bitmap);
5636 pr_warn("%s: failed to create bitmap (%d)\n",
5637 mdname(mddev), err);
5639 mddev->bitmap = bitmap;
5643 mddev_detach(mddev);
5645 pers->free(mddev, mddev->private);
5646 mddev->private = NULL;
5647 module_put(pers->owner);
5648 bitmap_destroy(mddev);
5654 rdev_for_each(rdev, mddev) {
5655 if (rdev->raid_disk >= 0 &&
5656 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5661 if (mddev->degraded)
5664 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5666 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5667 mddev->queue->backing_dev_info->congested_data = mddev;
5668 mddev->queue->backing_dev_info->congested_fn = md_congested;
5670 if (pers->sync_request) {
5671 if (mddev->kobj.sd &&
5672 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5673 pr_warn("md: cannot register extra attributes for %s\n",
5675 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5676 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5679 atomic_set(&mddev->max_corr_read_errors,
5680 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5681 mddev->safemode = 0;
5682 if (mddev_is_clustered(mddev))
5683 mddev->safemode_delay = 0;
5685 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5688 spin_lock(&mddev->lock);
5690 spin_unlock(&mddev->lock);
5691 rdev_for_each(rdev, mddev)
5692 if (rdev->raid_disk >= 0)
5693 if (sysfs_link_rdev(mddev, rdev))
5694 /* failure here is OK */;
5696 if (mddev->degraded && !mddev->ro)
5697 /* This ensures that recovering status is reported immediately
5698 * via sysfs - until a lack of spares is confirmed.
5700 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5701 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5703 if (mddev->sb_flags)
5704 md_update_sb(mddev, 0);
5706 md_new_event(mddev);
5710 if (mddev->bio_set) {
5711 bioset_free(mddev->bio_set);
5712 mddev->bio_set = NULL;
5714 if (mddev->sync_set) {
5715 bioset_free(mddev->sync_set);
5716 mddev->sync_set = NULL;
5721 EXPORT_SYMBOL_GPL(md_run);
5723 static int do_md_run(struct mddev *mddev)
5727 set_bit(MD_NOT_READY, &mddev->flags);
5728 err = md_run(mddev);
5731 err = bitmap_load(mddev);
5733 bitmap_destroy(mddev);
5737 if (mddev_is_clustered(mddev))
5738 md_allow_write(mddev);
5740 md_wakeup_thread(mddev->thread);
5741 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5743 set_capacity(mddev->gendisk, mddev->array_sectors);
5744 revalidate_disk(mddev->gendisk);
5745 clear_bit(MD_NOT_READY, &mddev->flags);
5747 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5748 sysfs_notify_dirent_safe(mddev->sysfs_state);
5749 sysfs_notify_dirent_safe(mddev->sysfs_action);
5750 sysfs_notify(&mddev->kobj, NULL, "degraded");
5752 clear_bit(MD_NOT_READY, &mddev->flags);
5756 static int restart_array(struct mddev *mddev)
5758 struct gendisk *disk = mddev->gendisk;
5759 struct md_rdev *rdev;
5760 bool has_journal = false;
5761 bool has_readonly = false;
5763 /* Complain if it has no devices */
5764 if (list_empty(&mddev->disks))
5772 rdev_for_each_rcu(rdev, mddev) {
5773 if (test_bit(Journal, &rdev->flags) &&
5774 !test_bit(Faulty, &rdev->flags))
5776 if (bdev_read_only(rdev->bdev))
5777 has_readonly = true;
5780 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5781 /* Don't restart rw with journal missing/faulty */
5786 mddev->safemode = 0;
5788 set_disk_ro(disk, 0);
5789 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5790 /* Kick recovery or resync if necessary */
5791 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5792 md_wakeup_thread(mddev->thread);
5793 md_wakeup_thread(mddev->sync_thread);
5794 sysfs_notify_dirent_safe(mddev->sysfs_state);
5798 static void md_clean(struct mddev *mddev)
5800 mddev->array_sectors = 0;
5801 mddev->external_size = 0;
5802 mddev->dev_sectors = 0;
5803 mddev->raid_disks = 0;
5804 mddev->recovery_cp = 0;
5805 mddev->resync_min = 0;
5806 mddev->resync_max = MaxSector;
5807 mddev->reshape_position = MaxSector;
5808 mddev->external = 0;
5809 mddev->persistent = 0;
5810 mddev->level = LEVEL_NONE;
5811 mddev->clevel[0] = 0;
5813 mddev->sb_flags = 0;
5815 mddev->metadata_type[0] = 0;
5816 mddev->chunk_sectors = 0;
5817 mddev->ctime = mddev->utime = 0;
5819 mddev->max_disks = 0;
5821 mddev->can_decrease_events = 0;
5822 mddev->delta_disks = 0;
5823 mddev->reshape_backwards = 0;
5824 mddev->new_level = LEVEL_NONE;
5825 mddev->new_layout = 0;
5826 mddev->new_chunk_sectors = 0;
5827 mddev->curr_resync = 0;
5828 atomic64_set(&mddev->resync_mismatches, 0);
5829 mddev->suspend_lo = mddev->suspend_hi = 0;
5830 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5831 mddev->recovery = 0;
5834 mddev->degraded = 0;
5835 mddev->safemode = 0;
5836 mddev->private = NULL;
5837 mddev->cluster_info = NULL;
5838 mddev->bitmap_info.offset = 0;
5839 mddev->bitmap_info.default_offset = 0;
5840 mddev->bitmap_info.default_space = 0;
5841 mddev->bitmap_info.chunksize = 0;
5842 mddev->bitmap_info.daemon_sleep = 0;
5843 mddev->bitmap_info.max_write_behind = 0;
5844 mddev->bitmap_info.nodes = 0;
5847 static void __md_stop_writes(struct mddev *mddev)
5849 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5850 flush_workqueue(md_misc_wq);
5851 if (mddev->sync_thread) {
5852 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5853 md_reap_sync_thread(mddev);
5856 del_timer_sync(&mddev->safemode_timer);
5858 if (mddev->pers && mddev->pers->quiesce) {
5859 mddev->pers->quiesce(mddev, 1);
5860 mddev->pers->quiesce(mddev, 0);
5862 bitmap_flush(mddev);
5864 if (mddev->ro == 0 &&
5865 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5867 /* mark array as shutdown cleanly */
5868 if (!mddev_is_clustered(mddev))
5870 md_update_sb(mddev, 1);
5874 void md_stop_writes(struct mddev *mddev)
5876 mddev_lock_nointr(mddev);
5877 __md_stop_writes(mddev);
5878 mddev_unlock(mddev);
5880 EXPORT_SYMBOL_GPL(md_stop_writes);
5882 static void mddev_detach(struct mddev *mddev)
5884 bitmap_wait_behind_writes(mddev);
5885 if (mddev->pers && mddev->pers->quiesce) {
5886 mddev->pers->quiesce(mddev, 1);
5887 mddev->pers->quiesce(mddev, 0);
5889 md_unregister_thread(&mddev->thread);
5891 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5894 static void __md_stop(struct mddev *mddev)
5896 struct md_personality *pers = mddev->pers;
5897 bitmap_destroy(mddev);
5898 mddev_detach(mddev);
5899 /* Ensure ->event_work is done */
5900 flush_workqueue(md_misc_wq);
5901 spin_lock(&mddev->lock);
5903 spin_unlock(&mddev->lock);
5904 pers->free(mddev, mddev->private);
5905 mddev->private = NULL;
5906 if (pers->sync_request && mddev->to_remove == NULL)
5907 mddev->to_remove = &md_redundancy_group;
5908 module_put(pers->owner);
5909 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5912 void md_stop(struct mddev *mddev)
5914 /* stop the array and free an attached data structures.
5915 * This is called from dm-raid
5917 __md_stop_writes(mddev);
5920 bioset_free(mddev->bio_set);
5923 EXPORT_SYMBOL_GPL(md_stop);
5925 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5930 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5932 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5933 md_wakeup_thread(mddev->thread);
5935 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5936 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5937 if (mddev->sync_thread)
5938 /* Thread might be blocked waiting for metadata update
5939 * which will now never happen */
5940 wake_up_process(mddev->sync_thread->tsk);
5942 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5944 mddev_unlock(mddev);
5945 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5947 wait_event(mddev->sb_wait,
5948 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5949 mddev_lock_nointr(mddev);
5951 mutex_lock(&mddev->open_mutex);
5952 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5953 mddev->sync_thread ||
5954 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5955 pr_warn("md: %s still in use.\n",mdname(mddev));
5957 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5958 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5959 md_wakeup_thread(mddev->thread);
5965 __md_stop_writes(mddev);
5971 set_disk_ro(mddev->gendisk, 1);
5972 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5973 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5974 md_wakeup_thread(mddev->thread);
5975 sysfs_notify_dirent_safe(mddev->sysfs_state);
5979 mutex_unlock(&mddev->open_mutex);
5984 * 0 - completely stop and dis-assemble array
5985 * 2 - stop but do not disassemble array
5987 static int do_md_stop(struct mddev *mddev, int mode,
5988 struct block_device *bdev)
5990 struct gendisk *disk = mddev->gendisk;
5991 struct md_rdev *rdev;
5994 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5996 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5997 md_wakeup_thread(mddev->thread);
5999 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6000 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6001 if (mddev->sync_thread)
6002 /* Thread might be blocked waiting for metadata update
6003 * which will now never happen */
6004 wake_up_process(mddev->sync_thread->tsk);
6006 mddev_unlock(mddev);
6007 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6008 !test_bit(MD_RECOVERY_RUNNING,
6009 &mddev->recovery)));
6010 mddev_lock_nointr(mddev);
6012 mutex_lock(&mddev->open_mutex);
6013 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6014 mddev->sysfs_active ||
6015 mddev->sync_thread ||
6016 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6017 pr_warn("md: %s still in use.\n",mdname(mddev));
6018 mutex_unlock(&mddev->open_mutex);
6020 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6021 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6022 md_wakeup_thread(mddev->thread);
6028 set_disk_ro(disk, 0);
6030 __md_stop_writes(mddev);
6032 mddev->queue->backing_dev_info->congested_fn = NULL;
6034 /* tell userspace to handle 'inactive' */
6035 sysfs_notify_dirent_safe(mddev->sysfs_state);
6037 rdev_for_each(rdev, mddev)
6038 if (rdev->raid_disk >= 0)
6039 sysfs_unlink_rdev(mddev, rdev);
6041 set_capacity(disk, 0);
6042 mutex_unlock(&mddev->open_mutex);
6044 revalidate_disk(disk);
6049 mutex_unlock(&mddev->open_mutex);
6051 * Free resources if final stop
6054 pr_info("md: %s stopped.\n", mdname(mddev));
6056 if (mddev->bitmap_info.file) {
6057 struct file *f = mddev->bitmap_info.file;
6058 spin_lock(&mddev->lock);
6059 mddev->bitmap_info.file = NULL;
6060 spin_unlock(&mddev->lock);
6063 mddev->bitmap_info.offset = 0;
6065 export_array(mddev);
6068 if (mddev->hold_active == UNTIL_STOP)
6069 mddev->hold_active = 0;
6071 md_new_event(mddev);
6072 sysfs_notify_dirent_safe(mddev->sysfs_state);
6077 static void autorun_array(struct mddev *mddev)
6079 struct md_rdev *rdev;
6082 if (list_empty(&mddev->disks))
6085 pr_info("md: running: ");
6087 rdev_for_each(rdev, mddev) {
6088 char b[BDEVNAME_SIZE];
6089 pr_cont("<%s>", bdevname(rdev->bdev,b));
6093 err = do_md_run(mddev);
6095 pr_warn("md: do_md_run() returned %d\n", err);
6096 do_md_stop(mddev, 0, NULL);
6101 * lets try to run arrays based on all disks that have arrived
6102 * until now. (those are in pending_raid_disks)
6104 * the method: pick the first pending disk, collect all disks with
6105 * the same UUID, remove all from the pending list and put them into
6106 * the 'same_array' list. Then order this list based on superblock
6107 * update time (freshest comes first), kick out 'old' disks and
6108 * compare superblocks. If everything's fine then run it.
6110 * If "unit" is allocated, then bump its reference count
6112 static void autorun_devices(int part)
6114 struct md_rdev *rdev0, *rdev, *tmp;
6115 struct mddev *mddev;
6116 char b[BDEVNAME_SIZE];
6118 pr_info("md: autorun ...\n");
6119 while (!list_empty(&pending_raid_disks)) {
6122 LIST_HEAD(candidates);
6123 rdev0 = list_entry(pending_raid_disks.next,
6124 struct md_rdev, same_set);
6126 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6127 INIT_LIST_HEAD(&candidates);
6128 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6129 if (super_90_load(rdev, rdev0, 0) >= 0) {
6130 pr_debug("md: adding %s ...\n",
6131 bdevname(rdev->bdev,b));
6132 list_move(&rdev->same_set, &candidates);
6135 * now we have a set of devices, with all of them having
6136 * mostly sane superblocks. It's time to allocate the
6140 dev = MKDEV(mdp_major,
6141 rdev0->preferred_minor << MdpMinorShift);
6142 unit = MINOR(dev) >> MdpMinorShift;
6144 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6147 if (rdev0->preferred_minor != unit) {
6148 pr_warn("md: unit number in %s is bad: %d\n",
6149 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6153 md_probe(dev, NULL, NULL);
6154 mddev = mddev_find(dev);
6158 if (mddev_lock(mddev))
6159 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6160 else if (mddev->raid_disks || mddev->major_version
6161 || !list_empty(&mddev->disks)) {
6162 pr_warn("md: %s already running, cannot run %s\n",
6163 mdname(mddev), bdevname(rdev0->bdev,b));
6164 mddev_unlock(mddev);
6166 pr_debug("md: created %s\n", mdname(mddev));
6167 mddev->persistent = 1;
6168 rdev_for_each_list(rdev, tmp, &candidates) {
6169 list_del_init(&rdev->same_set);
6170 if (bind_rdev_to_array(rdev, mddev))
6173 autorun_array(mddev);
6174 mddev_unlock(mddev);
6176 /* on success, candidates will be empty, on error
6179 rdev_for_each_list(rdev, tmp, &candidates) {
6180 list_del_init(&rdev->same_set);
6185 pr_info("md: ... autorun DONE.\n");
6187 #endif /* !MODULE */
6189 static int get_version(void __user *arg)
6193 ver.major = MD_MAJOR_VERSION;
6194 ver.minor = MD_MINOR_VERSION;
6195 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6197 if (copy_to_user(arg, &ver, sizeof(ver)))
6203 static int get_array_info(struct mddev *mddev, void __user *arg)
6205 mdu_array_info_t info;
6206 int nr,working,insync,failed,spare;
6207 struct md_rdev *rdev;
6209 nr = working = insync = failed = spare = 0;
6211 rdev_for_each_rcu(rdev, mddev) {
6213 if (test_bit(Faulty, &rdev->flags))
6217 if (test_bit(In_sync, &rdev->flags))
6219 else if (test_bit(Journal, &rdev->flags))
6220 /* TODO: add journal count to md_u.h */
6228 info.major_version = mddev->major_version;
6229 info.minor_version = mddev->minor_version;
6230 info.patch_version = MD_PATCHLEVEL_VERSION;
6231 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6232 info.level = mddev->level;
6233 info.size = mddev->dev_sectors / 2;
6234 if (info.size != mddev->dev_sectors / 2) /* overflow */
6237 info.raid_disks = mddev->raid_disks;
6238 info.md_minor = mddev->md_minor;
6239 info.not_persistent= !mddev->persistent;
6241 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6244 info.state = (1<<MD_SB_CLEAN);
6245 if (mddev->bitmap && mddev->bitmap_info.offset)
6246 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6247 if (mddev_is_clustered(mddev))
6248 info.state |= (1<<MD_SB_CLUSTERED);
6249 info.active_disks = insync;
6250 info.working_disks = working;
6251 info.failed_disks = failed;
6252 info.spare_disks = spare;
6254 info.layout = mddev->layout;
6255 info.chunk_size = mddev->chunk_sectors << 9;
6257 if (copy_to_user(arg, &info, sizeof(info)))
6263 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6265 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6269 file = kzalloc(sizeof(*file), GFP_NOIO);
6274 spin_lock(&mddev->lock);
6275 /* bitmap enabled */
6276 if (mddev->bitmap_info.file) {
6277 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6278 sizeof(file->pathname));
6282 memmove(file->pathname, ptr,
6283 sizeof(file->pathname)-(ptr-file->pathname));
6285 spin_unlock(&mddev->lock);
6288 copy_to_user(arg, file, sizeof(*file)))
6295 static int get_disk_info(struct mddev *mddev, void __user * arg)
6297 mdu_disk_info_t info;
6298 struct md_rdev *rdev;
6300 if (copy_from_user(&info, arg, sizeof(info)))
6304 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6306 info.major = MAJOR(rdev->bdev->bd_dev);
6307 info.minor = MINOR(rdev->bdev->bd_dev);
6308 info.raid_disk = rdev->raid_disk;
6310 if (test_bit(Faulty, &rdev->flags))
6311 info.state |= (1<<MD_DISK_FAULTY);
6312 else if (test_bit(In_sync, &rdev->flags)) {
6313 info.state |= (1<<MD_DISK_ACTIVE);
6314 info.state |= (1<<MD_DISK_SYNC);
6316 if (test_bit(Journal, &rdev->flags))
6317 info.state |= (1<<MD_DISK_JOURNAL);
6318 if (test_bit(WriteMostly, &rdev->flags))
6319 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6320 if (test_bit(FailFast, &rdev->flags))
6321 info.state |= (1<<MD_DISK_FAILFAST);
6323 info.major = info.minor = 0;
6324 info.raid_disk = -1;
6325 info.state = (1<<MD_DISK_REMOVED);
6329 if (copy_to_user(arg, &info, sizeof(info)))
6335 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6337 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6338 struct md_rdev *rdev;
6339 dev_t dev = MKDEV(info->major,info->minor);
6341 if (mddev_is_clustered(mddev) &&
6342 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6343 pr_warn("%s: Cannot add to clustered mddev.\n",
6348 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6351 if (!mddev->raid_disks) {
6353 /* expecting a device which has a superblock */
6354 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6356 pr_warn("md: md_import_device returned %ld\n",
6358 return PTR_ERR(rdev);
6360 if (!list_empty(&mddev->disks)) {
6361 struct md_rdev *rdev0
6362 = list_entry(mddev->disks.next,
6363 struct md_rdev, same_set);
6364 err = super_types[mddev->major_version]
6365 .load_super(rdev, rdev0, mddev->minor_version);
6367 pr_warn("md: %s has different UUID to %s\n",
6368 bdevname(rdev->bdev,b),
6369 bdevname(rdev0->bdev,b2));
6374 err = bind_rdev_to_array(rdev, mddev);
6381 * add_new_disk can be used once the array is assembled
6382 * to add "hot spares". They must already have a superblock
6387 if (!mddev->pers->hot_add_disk) {
6388 pr_warn("%s: personality does not support diskops!\n",
6392 if (mddev->persistent)
6393 rdev = md_import_device(dev, mddev->major_version,
6394 mddev->minor_version);
6396 rdev = md_import_device(dev, -1, -1);
6398 pr_warn("md: md_import_device returned %ld\n",
6400 return PTR_ERR(rdev);
6402 /* set saved_raid_disk if appropriate */
6403 if (!mddev->persistent) {
6404 if (info->state & (1<<MD_DISK_SYNC) &&
6405 info->raid_disk < mddev->raid_disks) {
6406 rdev->raid_disk = info->raid_disk;
6407 set_bit(In_sync, &rdev->flags);
6408 clear_bit(Bitmap_sync, &rdev->flags);
6410 rdev->raid_disk = -1;
6411 rdev->saved_raid_disk = rdev->raid_disk;
6413 super_types[mddev->major_version].
6414 validate_super(mddev, rdev);
6415 if ((info->state & (1<<MD_DISK_SYNC)) &&
6416 rdev->raid_disk != info->raid_disk) {
6417 /* This was a hot-add request, but events doesn't
6418 * match, so reject it.
6424 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6425 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6426 set_bit(WriteMostly, &rdev->flags);
6428 clear_bit(WriteMostly, &rdev->flags);
6429 if (info->state & (1<<MD_DISK_FAILFAST))
6430 set_bit(FailFast, &rdev->flags);
6432 clear_bit(FailFast, &rdev->flags);
6434 if (info->state & (1<<MD_DISK_JOURNAL)) {
6435 struct md_rdev *rdev2;
6436 bool has_journal = false;
6438 /* make sure no existing journal disk */
6439 rdev_for_each(rdev2, mddev) {
6440 if (test_bit(Journal, &rdev2->flags)) {
6445 if (has_journal || mddev->bitmap) {
6449 set_bit(Journal, &rdev->flags);
6452 * check whether the device shows up in other nodes
6454 if (mddev_is_clustered(mddev)) {
6455 if (info->state & (1 << MD_DISK_CANDIDATE))
6456 set_bit(Candidate, &rdev->flags);
6457 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6458 /* --add initiated by this node */
6459 err = md_cluster_ops->add_new_disk(mddev, rdev);
6467 rdev->raid_disk = -1;
6468 err = bind_rdev_to_array(rdev, mddev);
6473 if (mddev_is_clustered(mddev)) {
6474 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6476 err = md_cluster_ops->new_disk_ack(mddev,
6479 md_kick_rdev_from_array(rdev);
6483 md_cluster_ops->add_new_disk_cancel(mddev);
6485 err = add_bound_rdev(rdev);
6489 err = add_bound_rdev(rdev);
6494 /* otherwise, add_new_disk is only allowed
6495 * for major_version==0 superblocks
6497 if (mddev->major_version != 0) {
6498 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6502 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6504 rdev = md_import_device(dev, -1, 0);
6506 pr_warn("md: error, md_import_device() returned %ld\n",
6508 return PTR_ERR(rdev);
6510 rdev->desc_nr = info->number;
6511 if (info->raid_disk < mddev->raid_disks)
6512 rdev->raid_disk = info->raid_disk;
6514 rdev->raid_disk = -1;
6516 if (rdev->raid_disk < mddev->raid_disks)
6517 if (info->state & (1<<MD_DISK_SYNC))
6518 set_bit(In_sync, &rdev->flags);
6520 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6521 set_bit(WriteMostly, &rdev->flags);
6522 if (info->state & (1<<MD_DISK_FAILFAST))
6523 set_bit(FailFast, &rdev->flags);
6525 if (!mddev->persistent) {
6526 pr_debug("md: nonpersistent superblock ...\n");
6527 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6529 rdev->sb_start = calc_dev_sboffset(rdev);
6530 rdev->sectors = rdev->sb_start;
6532 err = bind_rdev_to_array(rdev, mddev);
6542 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6544 char b[BDEVNAME_SIZE];
6545 struct md_rdev *rdev;
6550 rdev = find_rdev(mddev, dev);
6554 if (rdev->raid_disk < 0)
6557 clear_bit(Blocked, &rdev->flags);
6558 remove_and_add_spares(mddev, rdev);
6560 if (rdev->raid_disk >= 0)
6564 if (mddev_is_clustered(mddev)) {
6565 if (md_cluster_ops->remove_disk(mddev, rdev))
6569 md_kick_rdev_from_array(rdev);
6570 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6572 md_wakeup_thread(mddev->thread);
6574 md_update_sb(mddev, 1);
6575 md_new_event(mddev);
6579 pr_debug("md: cannot remove active disk %s from %s ...\n",
6580 bdevname(rdev->bdev,b), mdname(mddev));
6584 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6586 char b[BDEVNAME_SIZE];
6588 struct md_rdev *rdev;
6593 if (mddev->major_version != 0) {
6594 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6598 if (!mddev->pers->hot_add_disk) {
6599 pr_warn("%s: personality does not support diskops!\n",
6604 rdev = md_import_device(dev, -1, 0);
6606 pr_warn("md: error, md_import_device() returned %ld\n",
6611 if (mddev->persistent)
6612 rdev->sb_start = calc_dev_sboffset(rdev);
6614 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6616 rdev->sectors = rdev->sb_start;
6618 if (test_bit(Faulty, &rdev->flags)) {
6619 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6620 bdevname(rdev->bdev,b), mdname(mddev));
6625 clear_bit(In_sync, &rdev->flags);
6627 rdev->saved_raid_disk = -1;
6628 err = bind_rdev_to_array(rdev, mddev);
6633 * The rest should better be atomic, we can have disk failures
6634 * noticed in interrupt contexts ...
6637 rdev->raid_disk = -1;
6639 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6641 md_update_sb(mddev, 1);
6643 * Kick recovery, maybe this spare has to be added to the
6644 * array immediately.
6646 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6647 md_wakeup_thread(mddev->thread);
6648 md_new_event(mddev);
6656 static int set_bitmap_file(struct mddev *mddev, int fd)
6661 if (!mddev->pers->quiesce || !mddev->thread)
6663 if (mddev->recovery || mddev->sync_thread)
6665 /* we should be able to change the bitmap.. */
6669 struct inode *inode;
6672 if (mddev->bitmap || mddev->bitmap_info.file)
6673 return -EEXIST; /* cannot add when bitmap is present */
6677 pr_warn("%s: error: failed to get bitmap file\n",
6682 inode = f->f_mapping->host;
6683 if (!S_ISREG(inode->i_mode)) {
6684 pr_warn("%s: error: bitmap file must be a regular file\n",
6687 } else if (!(f->f_mode & FMODE_WRITE)) {
6688 pr_warn("%s: error: bitmap file must open for write\n",
6691 } else if (atomic_read(&inode->i_writecount) != 1) {
6692 pr_warn("%s: error: bitmap file is already in use\n",
6700 mddev->bitmap_info.file = f;
6701 mddev->bitmap_info.offset = 0; /* file overrides offset */
6702 } else if (mddev->bitmap == NULL)
6703 return -ENOENT; /* cannot remove what isn't there */
6707 struct bitmap *bitmap;
6709 bitmap = bitmap_create(mddev, -1);
6710 mddev_suspend(mddev);
6711 if (!IS_ERR(bitmap)) {
6712 mddev->bitmap = bitmap;
6713 err = bitmap_load(mddev);
6715 err = PTR_ERR(bitmap);
6717 bitmap_destroy(mddev);
6720 mddev_resume(mddev);
6721 } else if (fd < 0) {
6722 mddev_suspend(mddev);
6723 bitmap_destroy(mddev);
6724 mddev_resume(mddev);
6728 struct file *f = mddev->bitmap_info.file;
6730 spin_lock(&mddev->lock);
6731 mddev->bitmap_info.file = NULL;
6732 spin_unlock(&mddev->lock);
6741 * set_array_info is used two different ways
6742 * The original usage is when creating a new array.
6743 * In this usage, raid_disks is > 0 and it together with
6744 * level, size, not_persistent,layout,chunksize determine the
6745 * shape of the array.
6746 * This will always create an array with a type-0.90.0 superblock.
6747 * The newer usage is when assembling an array.
6748 * In this case raid_disks will be 0, and the major_version field is
6749 * use to determine which style super-blocks are to be found on the devices.
6750 * The minor and patch _version numbers are also kept incase the
6751 * super_block handler wishes to interpret them.
6753 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6756 if (info->raid_disks == 0) {
6757 /* just setting version number for superblock loading */
6758 if (info->major_version < 0 ||
6759 info->major_version >= ARRAY_SIZE(super_types) ||
6760 super_types[info->major_version].name == NULL) {
6761 /* maybe try to auto-load a module? */
6762 pr_warn("md: superblock version %d not known\n",
6763 info->major_version);
6766 mddev->major_version = info->major_version;
6767 mddev->minor_version = info->minor_version;
6768 mddev->patch_version = info->patch_version;
6769 mddev->persistent = !info->not_persistent;
6770 /* ensure mddev_put doesn't delete this now that there
6771 * is some minimal configuration.
6773 mddev->ctime = ktime_get_real_seconds();
6776 mddev->major_version = MD_MAJOR_VERSION;
6777 mddev->minor_version = MD_MINOR_VERSION;
6778 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6779 mddev->ctime = ktime_get_real_seconds();
6781 mddev->level = info->level;
6782 mddev->clevel[0] = 0;
6783 mddev->dev_sectors = 2 * (sector_t)info->size;
6784 mddev->raid_disks = info->raid_disks;
6785 /* don't set md_minor, it is determined by which /dev/md* was
6788 if (info->state & (1<<MD_SB_CLEAN))
6789 mddev->recovery_cp = MaxSector;
6791 mddev->recovery_cp = 0;
6792 mddev->persistent = ! info->not_persistent;
6793 mddev->external = 0;
6795 mddev->layout = info->layout;
6796 if (mddev->level == 0)
6797 /* Cannot trust RAID0 layout info here */
6799 mddev->chunk_sectors = info->chunk_size >> 9;
6801 if (mddev->persistent) {
6802 mddev->max_disks = MD_SB_DISKS;
6804 mddev->sb_flags = 0;
6806 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6808 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6809 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6810 mddev->bitmap_info.offset = 0;
6812 mddev->reshape_position = MaxSector;
6815 * Generate a 128 bit UUID
6817 get_random_bytes(mddev->uuid, 16);
6819 mddev->new_level = mddev->level;
6820 mddev->new_chunk_sectors = mddev->chunk_sectors;
6821 mddev->new_layout = mddev->layout;
6822 mddev->delta_disks = 0;
6823 mddev->reshape_backwards = 0;
6828 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6830 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6832 if (mddev->external_size)
6835 mddev->array_sectors = array_sectors;
6837 EXPORT_SYMBOL(md_set_array_sectors);
6839 static int update_size(struct mddev *mddev, sector_t num_sectors)
6841 struct md_rdev *rdev;
6843 int fit = (num_sectors == 0);
6844 sector_t old_dev_sectors = mddev->dev_sectors;
6846 if (mddev->pers->resize == NULL)
6848 /* The "num_sectors" is the number of sectors of each device that
6849 * is used. This can only make sense for arrays with redundancy.
6850 * linear and raid0 always use whatever space is available. We can only
6851 * consider changing this number if no resync or reconstruction is
6852 * happening, and if the new size is acceptable. It must fit before the
6853 * sb_start or, if that is <data_offset, it must fit before the size
6854 * of each device. If num_sectors is zero, we find the largest size
6857 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6863 rdev_for_each(rdev, mddev) {
6864 sector_t avail = rdev->sectors;
6866 if (fit && (num_sectors == 0 || num_sectors > avail))
6867 num_sectors = avail;
6868 if (avail < num_sectors)
6871 rv = mddev->pers->resize(mddev, num_sectors);
6873 if (mddev_is_clustered(mddev))
6874 md_cluster_ops->update_size(mddev, old_dev_sectors);
6875 else if (mddev->queue) {
6876 set_capacity(mddev->gendisk, mddev->array_sectors);
6877 revalidate_disk(mddev->gendisk);
6883 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6886 struct md_rdev *rdev;
6887 /* change the number of raid disks */
6888 if (mddev->pers->check_reshape == NULL)
6892 if (raid_disks <= 0 ||
6893 (mddev->max_disks && raid_disks >= mddev->max_disks))
6895 if (mddev->sync_thread ||
6896 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6897 mddev->reshape_position != MaxSector)
6900 rdev_for_each(rdev, mddev) {
6901 if (mddev->raid_disks < raid_disks &&
6902 rdev->data_offset < rdev->new_data_offset)
6904 if (mddev->raid_disks > raid_disks &&
6905 rdev->data_offset > rdev->new_data_offset)
6909 mddev->delta_disks = raid_disks - mddev->raid_disks;
6910 if (mddev->delta_disks < 0)
6911 mddev->reshape_backwards = 1;
6912 else if (mddev->delta_disks > 0)
6913 mddev->reshape_backwards = 0;
6915 rv = mddev->pers->check_reshape(mddev);
6917 mddev->delta_disks = 0;
6918 mddev->reshape_backwards = 0;
6924 * update_array_info is used to change the configuration of an
6926 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6927 * fields in the info are checked against the array.
6928 * Any differences that cannot be handled will cause an error.
6929 * Normally, only one change can be managed at a time.
6931 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6937 /* calculate expected state,ignoring low bits */
6938 if (mddev->bitmap && mddev->bitmap_info.offset)
6939 state |= (1 << MD_SB_BITMAP_PRESENT);
6941 if (mddev->major_version != info->major_version ||
6942 mddev->minor_version != info->minor_version ||
6943 /* mddev->patch_version != info->patch_version || */
6944 mddev->ctime != info->ctime ||
6945 mddev->level != info->level ||
6946 /* mddev->layout != info->layout || */
6947 mddev->persistent != !info->not_persistent ||
6948 mddev->chunk_sectors != info->chunk_size >> 9 ||
6949 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6950 ((state^info->state) & 0xfffffe00)
6953 /* Check there is only one change */
6954 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6956 if (mddev->raid_disks != info->raid_disks)
6958 if (mddev->layout != info->layout)
6960 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6967 if (mddev->layout != info->layout) {
6969 * we don't need to do anything at the md level, the
6970 * personality will take care of it all.
6972 if (mddev->pers->check_reshape == NULL)
6975 mddev->new_layout = info->layout;
6976 rv = mddev->pers->check_reshape(mddev);
6978 mddev->new_layout = mddev->layout;
6982 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6983 rv = update_size(mddev, (sector_t)info->size * 2);
6985 if (mddev->raid_disks != info->raid_disks)
6986 rv = update_raid_disks(mddev, info->raid_disks);
6988 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6989 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6993 if (mddev->recovery || mddev->sync_thread) {
6997 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6998 struct bitmap *bitmap;
6999 /* add the bitmap */
7000 if (mddev->bitmap) {
7004 if (mddev->bitmap_info.default_offset == 0) {
7008 mddev->bitmap_info.offset =
7009 mddev->bitmap_info.default_offset;
7010 mddev->bitmap_info.space =
7011 mddev->bitmap_info.default_space;
7012 bitmap = bitmap_create(mddev, -1);
7013 mddev_suspend(mddev);
7014 if (!IS_ERR(bitmap)) {
7015 mddev->bitmap = bitmap;
7016 rv = bitmap_load(mddev);
7018 rv = PTR_ERR(bitmap);
7020 bitmap_destroy(mddev);
7021 mddev_resume(mddev);
7023 /* remove the bitmap */
7024 if (!mddev->bitmap) {
7028 if (mddev->bitmap->storage.file) {
7032 if (mddev->bitmap_info.nodes) {
7033 /* hold PW on all the bitmap lock */
7034 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7035 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7037 md_cluster_ops->unlock_all_bitmaps(mddev);
7041 mddev->bitmap_info.nodes = 0;
7042 md_cluster_ops->leave(mddev);
7044 mddev_suspend(mddev);
7045 bitmap_destroy(mddev);
7046 mddev_resume(mddev);
7047 mddev->bitmap_info.offset = 0;
7050 md_update_sb(mddev, 1);
7056 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7058 struct md_rdev *rdev;
7061 if (mddev->pers == NULL)
7065 rdev = find_rdev_rcu(mddev, dev);
7069 md_error(mddev, rdev);
7070 if (!test_bit(Faulty, &rdev->flags))
7078 * We have a problem here : there is no easy way to give a CHS
7079 * virtual geometry. We currently pretend that we have a 2 heads
7080 * 4 sectors (with a BIG number of cylinders...). This drives
7081 * dosfs just mad... ;-)
7083 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7085 struct mddev *mddev = bdev->bd_disk->private_data;
7089 geo->cylinders = mddev->array_sectors / 8;
7093 static inline bool md_ioctl_valid(unsigned int cmd)
7098 case GET_ARRAY_INFO:
7099 case GET_BITMAP_FILE:
7102 case HOT_REMOVE_DISK:
7105 case RESTART_ARRAY_RW:
7107 case SET_ARRAY_INFO:
7108 case SET_BITMAP_FILE:
7109 case SET_DISK_FAULTY:
7112 case CLUSTERED_DISK_NACK:
7119 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7120 unsigned int cmd, unsigned long arg)
7123 void __user *argp = (void __user *)arg;
7124 struct mddev *mddev = NULL;
7126 bool did_set_md_closing = false;
7128 if (!md_ioctl_valid(cmd))
7133 case GET_ARRAY_INFO:
7137 if (!capable(CAP_SYS_ADMIN))
7142 * Commands dealing with the RAID driver but not any
7147 err = get_version(argp);
7153 autostart_arrays(arg);
7160 * Commands creating/starting a new array:
7163 mddev = bdev->bd_disk->private_data;
7170 /* Some actions do not requires the mutex */
7172 case GET_ARRAY_INFO:
7173 if (!mddev->raid_disks && !mddev->external)
7176 err = get_array_info(mddev, argp);
7180 if (!mddev->raid_disks && !mddev->external)
7183 err = get_disk_info(mddev, argp);
7186 case SET_DISK_FAULTY:
7187 err = set_disk_faulty(mddev, new_decode_dev(arg));
7190 case GET_BITMAP_FILE:
7191 err = get_bitmap_file(mddev, argp);
7196 if (cmd == ADD_NEW_DISK)
7197 /* need to ensure md_delayed_delete() has completed */
7198 flush_workqueue(md_misc_wq);
7200 if (cmd == HOT_REMOVE_DISK)
7201 /* need to ensure recovery thread has run */
7202 wait_event_interruptible_timeout(mddev->sb_wait,
7203 !test_bit(MD_RECOVERY_NEEDED,
7205 msecs_to_jiffies(5000));
7206 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7207 /* Need to flush page cache, and ensure no-one else opens
7210 mutex_lock(&mddev->open_mutex);
7211 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7212 mutex_unlock(&mddev->open_mutex);
7216 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7217 mutex_unlock(&mddev->open_mutex);
7221 did_set_md_closing = true;
7222 mutex_unlock(&mddev->open_mutex);
7223 sync_blockdev(bdev);
7225 err = mddev_lock(mddev);
7227 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7232 if (cmd == SET_ARRAY_INFO) {
7233 mdu_array_info_t info;
7235 memset(&info, 0, sizeof(info));
7236 else if (copy_from_user(&info, argp, sizeof(info))) {
7241 err = update_array_info(mddev, &info);
7243 pr_warn("md: couldn't update array info. %d\n", err);
7248 if (!list_empty(&mddev->disks)) {
7249 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7253 if (mddev->raid_disks) {
7254 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7258 err = set_array_info(mddev, &info);
7260 pr_warn("md: couldn't set array info. %d\n", err);
7267 * Commands querying/configuring an existing array:
7269 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7270 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7271 if ((!mddev->raid_disks && !mddev->external)
7272 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7273 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7274 && cmd != GET_BITMAP_FILE) {
7280 * Commands even a read-only array can execute:
7283 case RESTART_ARRAY_RW:
7284 err = restart_array(mddev);
7288 err = do_md_stop(mddev, 0, bdev);
7292 err = md_set_readonly(mddev, bdev);
7295 case HOT_REMOVE_DISK:
7296 err = hot_remove_disk(mddev, new_decode_dev(arg));
7300 /* We can support ADD_NEW_DISK on read-only arrays
7301 * only if we are re-adding a preexisting device.
7302 * So require mddev->pers and MD_DISK_SYNC.
7305 mdu_disk_info_t info;
7306 if (copy_from_user(&info, argp, sizeof(info)))
7308 else if (!(info.state & (1<<MD_DISK_SYNC)))
7309 /* Need to clear read-only for this */
7312 err = add_new_disk(mddev, &info);
7318 if (get_user(ro, (int __user *)(arg))) {
7324 /* if the bdev is going readonly the value of mddev->ro
7325 * does not matter, no writes are coming
7330 /* are we are already prepared for writes? */
7334 /* transitioning to readauto need only happen for
7335 * arrays that call md_write_start
7338 err = restart_array(mddev);
7341 set_disk_ro(mddev->gendisk, 0);
7348 * The remaining ioctls are changing the state of the
7349 * superblock, so we do not allow them on read-only arrays.
7351 if (mddev->ro && mddev->pers) {
7352 if (mddev->ro == 2) {
7354 sysfs_notify_dirent_safe(mddev->sysfs_state);
7355 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7356 /* mddev_unlock will wake thread */
7357 /* If a device failed while we were read-only, we
7358 * need to make sure the metadata is updated now.
7360 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7361 mddev_unlock(mddev);
7362 wait_event(mddev->sb_wait,
7363 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7364 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7365 mddev_lock_nointr(mddev);
7376 mdu_disk_info_t info;
7377 if (copy_from_user(&info, argp, sizeof(info)))
7380 err = add_new_disk(mddev, &info);
7384 case CLUSTERED_DISK_NACK:
7385 if (mddev_is_clustered(mddev))
7386 md_cluster_ops->new_disk_ack(mddev, false);
7392 err = hot_add_disk(mddev, new_decode_dev(arg));
7396 err = do_md_run(mddev);
7399 case SET_BITMAP_FILE:
7400 err = set_bitmap_file(mddev, (int)arg);
7409 if (mddev->hold_active == UNTIL_IOCTL &&
7411 mddev->hold_active = 0;
7412 mddev_unlock(mddev);
7414 if(did_set_md_closing)
7415 clear_bit(MD_CLOSING, &mddev->flags);
7418 #ifdef CONFIG_COMPAT
7419 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7420 unsigned int cmd, unsigned long arg)
7423 case HOT_REMOVE_DISK:
7425 case SET_DISK_FAULTY:
7426 case SET_BITMAP_FILE:
7427 /* These take in integer arg, do not convert */
7430 arg = (unsigned long)compat_ptr(arg);
7434 return md_ioctl(bdev, mode, cmd, arg);
7436 #endif /* CONFIG_COMPAT */
7438 static int md_open(struct block_device *bdev, fmode_t mode)
7441 * Succeed if we can lock the mddev, which confirms that
7442 * it isn't being stopped right now.
7444 struct mddev *mddev = mddev_find(bdev->bd_dev);
7450 if (mddev->gendisk != bdev->bd_disk) {
7451 /* we are racing with mddev_put which is discarding this
7455 /* Wait until bdev->bd_disk is definitely gone */
7456 if (work_pending(&mddev->del_work))
7457 flush_workqueue(md_misc_wq);
7460 BUG_ON(mddev != bdev->bd_disk->private_data);
7462 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7465 if (test_bit(MD_CLOSING, &mddev->flags)) {
7466 mutex_unlock(&mddev->open_mutex);
7472 atomic_inc(&mddev->openers);
7473 mutex_unlock(&mddev->open_mutex);
7475 check_disk_change(bdev);
7482 static void md_release(struct gendisk *disk, fmode_t mode)
7484 struct mddev *mddev = disk->private_data;
7487 atomic_dec(&mddev->openers);
7491 static int md_media_changed(struct gendisk *disk)
7493 struct mddev *mddev = disk->private_data;
7495 return mddev->changed;
7498 static int md_revalidate(struct gendisk *disk)
7500 struct mddev *mddev = disk->private_data;
7505 static const struct block_device_operations md_fops =
7507 .owner = THIS_MODULE,
7509 .release = md_release,
7511 #ifdef CONFIG_COMPAT
7512 .compat_ioctl = md_compat_ioctl,
7514 .getgeo = md_getgeo,
7515 .media_changed = md_media_changed,
7516 .revalidate_disk= md_revalidate,
7519 static int md_thread(void *arg)
7521 struct md_thread *thread = arg;
7524 * md_thread is a 'system-thread', it's priority should be very
7525 * high. We avoid resource deadlocks individually in each
7526 * raid personality. (RAID5 does preallocation) We also use RR and
7527 * the very same RT priority as kswapd, thus we will never get
7528 * into a priority inversion deadlock.
7530 * we definitely have to have equal or higher priority than
7531 * bdflush, otherwise bdflush will deadlock if there are too
7532 * many dirty RAID5 blocks.
7535 allow_signal(SIGKILL);
7536 while (!kthread_should_stop()) {
7538 /* We need to wait INTERRUPTIBLE so that
7539 * we don't add to the load-average.
7540 * That means we need to be sure no signals are
7543 if (signal_pending(current))
7544 flush_signals(current);
7546 wait_event_interruptible_timeout
7548 test_bit(THREAD_WAKEUP, &thread->flags)
7549 || kthread_should_stop() || kthread_should_park(),
7552 clear_bit(THREAD_WAKEUP, &thread->flags);
7553 if (kthread_should_park())
7555 if (!kthread_should_stop())
7556 thread->run(thread);
7562 void md_wakeup_thread(struct md_thread *thread)
7565 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7566 set_bit(THREAD_WAKEUP, &thread->flags);
7567 wake_up(&thread->wqueue);
7570 EXPORT_SYMBOL(md_wakeup_thread);
7572 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7573 struct mddev *mddev, const char *name)
7575 struct md_thread *thread;
7577 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7581 init_waitqueue_head(&thread->wqueue);
7584 thread->mddev = mddev;
7585 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7586 thread->tsk = kthread_run(md_thread, thread,
7588 mdname(thread->mddev),
7590 if (IS_ERR(thread->tsk)) {
7596 EXPORT_SYMBOL(md_register_thread);
7598 void md_unregister_thread(struct md_thread **threadp)
7600 struct md_thread *thread;
7603 * Locking ensures that mddev_unlock does not wake_up a
7604 * non-existent thread
7606 spin_lock(&pers_lock);
7609 spin_unlock(&pers_lock);
7613 spin_unlock(&pers_lock);
7615 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7616 kthread_stop(thread->tsk);
7619 EXPORT_SYMBOL(md_unregister_thread);
7621 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7623 if (!rdev || test_bit(Faulty, &rdev->flags))
7626 if (!mddev->pers || !mddev->pers->error_handler)
7628 mddev->pers->error_handler(mddev,rdev);
7629 if (mddev->degraded)
7630 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7631 sysfs_notify_dirent_safe(rdev->sysfs_state);
7632 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7633 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7634 md_wakeup_thread(mddev->thread);
7635 if (mddev->event_work.func)
7636 queue_work(md_misc_wq, &mddev->event_work);
7637 md_new_event(mddev);
7639 EXPORT_SYMBOL(md_error);
7641 /* seq_file implementation /proc/mdstat */
7643 static void status_unused(struct seq_file *seq)
7646 struct md_rdev *rdev;
7648 seq_printf(seq, "unused devices: ");
7650 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7651 char b[BDEVNAME_SIZE];
7653 seq_printf(seq, "%s ",
7654 bdevname(rdev->bdev,b));
7657 seq_printf(seq, "<none>");
7659 seq_printf(seq, "\n");
7662 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7664 sector_t max_sectors, resync, res;
7665 unsigned long dt, db = 0;
7666 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7667 int scale, recovery_active;
7668 unsigned int per_milli;
7670 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7671 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7672 max_sectors = mddev->resync_max_sectors;
7674 max_sectors = mddev->dev_sectors;
7676 resync = mddev->curr_resync;
7678 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7679 /* Still cleaning up */
7680 resync = max_sectors;
7682 resync -= atomic_read(&mddev->recovery_active);
7685 if (mddev->recovery_cp < MaxSector) {
7686 seq_printf(seq, "\tresync=PENDING");
7692 seq_printf(seq, "\tresync=DELAYED");
7696 WARN_ON(max_sectors == 0);
7697 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7698 * in a sector_t, and (max_sectors>>scale) will fit in a
7699 * u32, as those are the requirements for sector_div.
7700 * Thus 'scale' must be at least 10
7703 if (sizeof(sector_t) > sizeof(unsigned long)) {
7704 while ( max_sectors/2 > (1ULL<<(scale+32)))
7707 res = (resync>>scale)*1000;
7708 sector_div(res, (u32)((max_sectors>>scale)+1));
7712 int i, x = per_milli/50, y = 20-x;
7713 seq_printf(seq, "[");
7714 for (i = 0; i < x; i++)
7715 seq_printf(seq, "=");
7716 seq_printf(seq, ">");
7717 for (i = 0; i < y; i++)
7718 seq_printf(seq, ".");
7719 seq_printf(seq, "] ");
7721 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7722 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7724 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7726 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7727 "resync" : "recovery"))),
7728 per_milli/10, per_milli % 10,
7729 (unsigned long long) resync/2,
7730 (unsigned long long) max_sectors/2);
7733 * dt: time from mark until now
7734 * db: blocks written from mark until now
7735 * rt: remaining time
7737 * rt is a sector_t, which is always 64bit now. We are keeping
7738 * the original algorithm, but it is not really necessary.
7740 * Original algorithm:
7741 * So we divide before multiply in case it is 32bit and close
7743 * We scale the divisor (db) by 32 to avoid losing precision
7744 * near the end of resync when the number of remaining sectors
7746 * We then divide rt by 32 after multiplying by db to compensate.
7747 * The '+1' avoids division by zero if db is very small.
7749 dt = ((jiffies - mddev->resync_mark) / HZ);
7752 curr_mark_cnt = mddev->curr_mark_cnt;
7753 recovery_active = atomic_read(&mddev->recovery_active);
7754 resync_mark_cnt = mddev->resync_mark_cnt;
7756 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7757 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7759 rt = max_sectors - resync; /* number of remaining sectors */
7760 rt = div64_u64(rt, db/32+1);
7764 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7765 ((unsigned long)rt % 60)/6);
7767 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7771 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7773 struct list_head *tmp;
7775 struct mddev *mddev;
7783 spin_lock(&all_mddevs_lock);
7784 list_for_each(tmp,&all_mddevs)
7786 mddev = list_entry(tmp, struct mddev, all_mddevs);
7788 spin_unlock(&all_mddevs_lock);
7791 spin_unlock(&all_mddevs_lock);
7793 return (void*)2;/* tail */
7797 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7799 struct list_head *tmp;
7800 struct mddev *next_mddev, *mddev = v;
7806 spin_lock(&all_mddevs_lock);
7808 tmp = all_mddevs.next;
7810 tmp = mddev->all_mddevs.next;
7811 if (tmp != &all_mddevs)
7812 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7814 next_mddev = (void*)2;
7817 spin_unlock(&all_mddevs_lock);
7825 static void md_seq_stop(struct seq_file *seq, void *v)
7827 struct mddev *mddev = v;
7829 if (mddev && v != (void*)1 && v != (void*)2)
7833 static int md_seq_show(struct seq_file *seq, void *v)
7835 struct mddev *mddev = v;
7837 struct md_rdev *rdev;
7839 if (v == (void*)1) {
7840 struct md_personality *pers;
7841 seq_printf(seq, "Personalities : ");
7842 spin_lock(&pers_lock);
7843 list_for_each_entry(pers, &pers_list, list)
7844 seq_printf(seq, "[%s] ", pers->name);
7846 spin_unlock(&pers_lock);
7847 seq_printf(seq, "\n");
7848 seq->poll_event = atomic_read(&md_event_count);
7851 if (v == (void*)2) {
7856 spin_lock(&mddev->lock);
7857 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7858 seq_printf(seq, "%s : %sactive", mdname(mddev),
7859 mddev->pers ? "" : "in");
7862 seq_printf(seq, " (read-only)");
7864 seq_printf(seq, " (auto-read-only)");
7865 seq_printf(seq, " %s", mddev->pers->name);
7870 rdev_for_each_rcu(rdev, mddev) {
7871 char b[BDEVNAME_SIZE];
7872 seq_printf(seq, " %s[%d]",
7873 bdevname(rdev->bdev,b), rdev->desc_nr);
7874 if (test_bit(WriteMostly, &rdev->flags))
7875 seq_printf(seq, "(W)");
7876 if (test_bit(Journal, &rdev->flags))
7877 seq_printf(seq, "(J)");
7878 if (test_bit(Faulty, &rdev->flags)) {
7879 seq_printf(seq, "(F)");
7882 if (rdev->raid_disk < 0)
7883 seq_printf(seq, "(S)"); /* spare */
7884 if (test_bit(Replacement, &rdev->flags))
7885 seq_printf(seq, "(R)");
7886 sectors += rdev->sectors;
7890 if (!list_empty(&mddev->disks)) {
7892 seq_printf(seq, "\n %llu blocks",
7893 (unsigned long long)
7894 mddev->array_sectors / 2);
7896 seq_printf(seq, "\n %llu blocks",
7897 (unsigned long long)sectors / 2);
7899 if (mddev->persistent) {
7900 if (mddev->major_version != 0 ||
7901 mddev->minor_version != 90) {
7902 seq_printf(seq," super %d.%d",
7903 mddev->major_version,
7904 mddev->minor_version);
7906 } else if (mddev->external)
7907 seq_printf(seq, " super external:%s",
7908 mddev->metadata_type);
7910 seq_printf(seq, " super non-persistent");
7913 mddev->pers->status(seq, mddev);
7914 seq_printf(seq, "\n ");
7915 if (mddev->pers->sync_request) {
7916 if (status_resync(seq, mddev))
7917 seq_printf(seq, "\n ");
7920 seq_printf(seq, "\n ");
7922 bitmap_status(seq, mddev->bitmap);
7924 seq_printf(seq, "\n");
7926 spin_unlock(&mddev->lock);
7931 static const struct seq_operations md_seq_ops = {
7932 .start = md_seq_start,
7933 .next = md_seq_next,
7934 .stop = md_seq_stop,
7935 .show = md_seq_show,
7938 static int md_seq_open(struct inode *inode, struct file *file)
7940 struct seq_file *seq;
7943 error = seq_open(file, &md_seq_ops);
7947 seq = file->private_data;
7948 seq->poll_event = atomic_read(&md_event_count);
7952 static int md_unloading;
7953 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7955 struct seq_file *seq = filp->private_data;
7959 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7960 poll_wait(filp, &md_event_waiters, wait);
7962 /* always allow read */
7963 mask = POLLIN | POLLRDNORM;
7965 if (seq->poll_event != atomic_read(&md_event_count))
7966 mask |= POLLERR | POLLPRI;
7970 static const struct file_operations md_seq_fops = {
7971 .owner = THIS_MODULE,
7972 .open = md_seq_open,
7974 .llseek = seq_lseek,
7975 .release = seq_release,
7976 .poll = mdstat_poll,
7979 int register_md_personality(struct md_personality *p)
7981 pr_debug("md: %s personality registered for level %d\n",
7983 spin_lock(&pers_lock);
7984 list_add_tail(&p->list, &pers_list);
7985 spin_unlock(&pers_lock);
7988 EXPORT_SYMBOL(register_md_personality);
7990 int unregister_md_personality(struct md_personality *p)
7992 pr_debug("md: %s personality unregistered\n", p->name);
7993 spin_lock(&pers_lock);
7994 list_del_init(&p->list);
7995 spin_unlock(&pers_lock);
7998 EXPORT_SYMBOL(unregister_md_personality);
8000 int register_md_cluster_operations(struct md_cluster_operations *ops,
8001 struct module *module)
8004 spin_lock(&pers_lock);
8005 if (md_cluster_ops != NULL)
8008 md_cluster_ops = ops;
8009 md_cluster_mod = module;
8011 spin_unlock(&pers_lock);
8014 EXPORT_SYMBOL(register_md_cluster_operations);
8016 int unregister_md_cluster_operations(void)
8018 spin_lock(&pers_lock);
8019 md_cluster_ops = NULL;
8020 spin_unlock(&pers_lock);
8023 EXPORT_SYMBOL(unregister_md_cluster_operations);
8025 int md_setup_cluster(struct mddev *mddev, int nodes)
8027 if (!md_cluster_ops)
8028 request_module("md-cluster");
8029 spin_lock(&pers_lock);
8030 /* ensure module won't be unloaded */
8031 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8032 pr_warn("can't find md-cluster module or get it's reference.\n");
8033 spin_unlock(&pers_lock);
8036 spin_unlock(&pers_lock);
8038 return md_cluster_ops->join(mddev, nodes);
8041 void md_cluster_stop(struct mddev *mddev)
8043 if (!md_cluster_ops)
8045 md_cluster_ops->leave(mddev);
8046 module_put(md_cluster_mod);
8049 static int is_mddev_idle(struct mddev *mddev, int init)
8051 struct md_rdev *rdev;
8057 rdev_for_each_rcu(rdev, mddev) {
8058 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8059 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
8060 (int)part_stat_read(&disk->part0, sectors[1]) -
8061 atomic_read(&disk->sync_io);
8062 /* sync IO will cause sync_io to increase before the disk_stats
8063 * as sync_io is counted when a request starts, and
8064 * disk_stats is counted when it completes.
8065 * So resync activity will cause curr_events to be smaller than
8066 * when there was no such activity.
8067 * non-sync IO will cause disk_stat to increase without
8068 * increasing sync_io so curr_events will (eventually)
8069 * be larger than it was before. Once it becomes
8070 * substantially larger, the test below will cause
8071 * the array to appear non-idle, and resync will slow
8073 * If there is a lot of outstanding resync activity when
8074 * we set last_event to curr_events, then all that activity
8075 * completing might cause the array to appear non-idle
8076 * and resync will be slowed down even though there might
8077 * not have been non-resync activity. This will only
8078 * happen once though. 'last_events' will soon reflect
8079 * the state where there is little or no outstanding
8080 * resync requests, and further resync activity will
8081 * always make curr_events less than last_events.
8084 if (init || curr_events - rdev->last_events > 64) {
8085 rdev->last_events = curr_events;
8093 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8095 /* another "blocks" (512byte) blocks have been synced */
8096 atomic_sub(blocks, &mddev->recovery_active);
8097 wake_up(&mddev->recovery_wait);
8099 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8100 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8101 md_wakeup_thread(mddev->thread);
8102 // stop recovery, signal do_sync ....
8105 EXPORT_SYMBOL(md_done_sync);
8107 /* md_write_start(mddev, bi)
8108 * If we need to update some array metadata (e.g. 'active' flag
8109 * in superblock) before writing, schedule a superblock update
8110 * and wait for it to complete.
8111 * A return value of 'false' means that the write wasn't recorded
8112 * and cannot proceed as the array is being suspend.
8114 bool md_write_start(struct mddev *mddev, struct bio *bi)
8118 if (bio_data_dir(bi) != WRITE)
8121 BUG_ON(mddev->ro == 1);
8122 if (mddev->ro == 2) {
8123 /* need to switch to read/write */
8125 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8126 md_wakeup_thread(mddev->thread);
8127 md_wakeup_thread(mddev->sync_thread);
8131 percpu_ref_get(&mddev->writes_pending);
8132 smp_mb(); /* Match smp_mb in set_in_sync() */
8133 if (mddev->safemode == 1)
8134 mddev->safemode = 0;
8135 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8136 if (mddev->in_sync || mddev->sync_checkers) {
8137 spin_lock(&mddev->lock);
8138 if (mddev->in_sync) {
8140 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8141 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8142 md_wakeup_thread(mddev->thread);
8145 spin_unlock(&mddev->lock);
8149 sysfs_notify_dirent_safe(mddev->sysfs_state);
8150 if (!mddev->has_superblocks)
8152 wait_event(mddev->sb_wait,
8153 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8155 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8156 percpu_ref_put(&mddev->writes_pending);
8161 EXPORT_SYMBOL(md_write_start);
8163 /* md_write_inc can only be called when md_write_start() has
8164 * already been called at least once of the current request.
8165 * It increments the counter and is useful when a single request
8166 * is split into several parts. Each part causes an increment and
8167 * so needs a matching md_write_end().
8168 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8169 * a spinlocked region.
8171 void md_write_inc(struct mddev *mddev, struct bio *bi)
8173 if (bio_data_dir(bi) != WRITE)
8175 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8176 percpu_ref_get(&mddev->writes_pending);
8178 EXPORT_SYMBOL(md_write_inc);
8180 void md_write_end(struct mddev *mddev)
8182 percpu_ref_put(&mddev->writes_pending);
8184 if (mddev->safemode == 2)
8185 md_wakeup_thread(mddev->thread);
8186 else if (mddev->safemode_delay)
8187 /* The roundup() ensures this only performs locking once
8188 * every ->safemode_delay jiffies
8190 mod_timer(&mddev->safemode_timer,
8191 roundup(jiffies, mddev->safemode_delay) +
8192 mddev->safemode_delay);
8195 EXPORT_SYMBOL(md_write_end);
8197 /* md_allow_write(mddev)
8198 * Calling this ensures that the array is marked 'active' so that writes
8199 * may proceed without blocking. It is important to call this before
8200 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8201 * Must be called with mddev_lock held.
8203 void md_allow_write(struct mddev *mddev)
8209 if (!mddev->pers->sync_request)
8212 spin_lock(&mddev->lock);
8213 if (mddev->in_sync) {
8215 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8216 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8217 if (mddev->safemode_delay &&
8218 mddev->safemode == 0)
8219 mddev->safemode = 1;
8220 spin_unlock(&mddev->lock);
8221 md_update_sb(mddev, 0);
8222 sysfs_notify_dirent_safe(mddev->sysfs_state);
8223 /* wait for the dirty state to be recorded in the metadata */
8224 wait_event(mddev->sb_wait,
8225 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8227 spin_unlock(&mddev->lock);
8229 EXPORT_SYMBOL_GPL(md_allow_write);
8231 #define SYNC_MARKS 10
8232 #define SYNC_MARK_STEP (3*HZ)
8233 #define UPDATE_FREQUENCY (5*60*HZ)
8234 void md_do_sync(struct md_thread *thread)
8236 struct mddev *mddev = thread->mddev;
8237 struct mddev *mddev2;
8238 unsigned int currspeed = 0,
8240 sector_t max_sectors,j, io_sectors, recovery_done;
8241 unsigned long mark[SYNC_MARKS];
8242 unsigned long update_time;
8243 sector_t mark_cnt[SYNC_MARKS];
8245 struct list_head *tmp;
8246 sector_t last_check;
8248 struct md_rdev *rdev;
8249 char *desc, *action = NULL;
8250 struct blk_plug plug;
8253 /* just incase thread restarts... */
8254 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8256 if (mddev->ro) {/* never try to sync a read-only array */
8257 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8261 if (mddev_is_clustered(mddev)) {
8262 ret = md_cluster_ops->resync_start(mddev);
8266 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8267 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8268 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8269 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8270 && ((unsigned long long)mddev->curr_resync_completed
8271 < (unsigned long long)mddev->resync_max_sectors))
8275 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8276 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8277 desc = "data-check";
8279 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8280 desc = "requested-resync";
8284 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8289 mddev->last_sync_action = action ?: desc;
8291 /* we overload curr_resync somewhat here.
8292 * 0 == not engaged in resync at all
8293 * 2 == checking that there is no conflict with another sync
8294 * 1 == like 2, but have yielded to allow conflicting resync to
8296 * other == active in resync - this many blocks
8298 * Before starting a resync we must have set curr_resync to
8299 * 2, and then checked that every "conflicting" array has curr_resync
8300 * less than ours. When we find one that is the same or higher
8301 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8302 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8303 * This will mean we have to start checking from the beginning again.
8308 int mddev2_minor = -1;
8309 mddev->curr_resync = 2;
8312 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8314 for_each_mddev(mddev2, tmp) {
8315 if (mddev2 == mddev)
8317 if (!mddev->parallel_resync
8318 && mddev2->curr_resync
8319 && match_mddev_units(mddev, mddev2)) {
8321 if (mddev < mddev2 && mddev->curr_resync == 2) {
8322 /* arbitrarily yield */
8323 mddev->curr_resync = 1;
8324 wake_up(&resync_wait);
8326 if (mddev > mddev2 && mddev->curr_resync == 1)
8327 /* no need to wait here, we can wait the next
8328 * time 'round when curr_resync == 2
8331 /* We need to wait 'interruptible' so as not to
8332 * contribute to the load average, and not to
8333 * be caught by 'softlockup'
8335 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8336 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8337 mddev2->curr_resync >= mddev->curr_resync) {
8338 if (mddev2_minor != mddev2->md_minor) {
8339 mddev2_minor = mddev2->md_minor;
8340 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8341 desc, mdname(mddev),
8345 if (signal_pending(current))
8346 flush_signals(current);
8348 finish_wait(&resync_wait, &wq);
8351 finish_wait(&resync_wait, &wq);
8354 } while (mddev->curr_resync < 2);
8357 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8358 /* resync follows the size requested by the personality,
8359 * which defaults to physical size, but can be virtual size
8361 max_sectors = mddev->resync_max_sectors;
8362 atomic64_set(&mddev->resync_mismatches, 0);
8363 /* we don't use the checkpoint if there's a bitmap */
8364 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8365 j = mddev->resync_min;
8366 else if (!mddev->bitmap)
8367 j = mddev->recovery_cp;
8369 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8370 max_sectors = mddev->resync_max_sectors;
8372 /* recovery follows the physical size of devices */
8373 max_sectors = mddev->dev_sectors;
8376 rdev_for_each_rcu(rdev, mddev)
8377 if (rdev->raid_disk >= 0 &&
8378 !test_bit(Journal, &rdev->flags) &&
8379 !test_bit(Faulty, &rdev->flags) &&
8380 !test_bit(In_sync, &rdev->flags) &&
8381 rdev->recovery_offset < j)
8382 j = rdev->recovery_offset;
8385 /* If there is a bitmap, we need to make sure all
8386 * writes that started before we added a spare
8387 * complete before we start doing a recovery.
8388 * Otherwise the write might complete and (via
8389 * bitmap_endwrite) set a bit in the bitmap after the
8390 * recovery has checked that bit and skipped that
8393 if (mddev->bitmap) {
8394 mddev->pers->quiesce(mddev, 1);
8395 mddev->pers->quiesce(mddev, 0);
8399 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8400 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8401 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8402 speed_max(mddev), desc);
8404 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8407 for (m = 0; m < SYNC_MARKS; m++) {
8409 mark_cnt[m] = io_sectors;
8412 mddev->resync_mark = mark[last_mark];
8413 mddev->resync_mark_cnt = mark_cnt[last_mark];
8416 * Tune reconstruction:
8418 window = 32*(PAGE_SIZE/512);
8419 pr_debug("md: using %dk window, over a total of %lluk.\n",
8420 window/2, (unsigned long long)max_sectors/2);
8422 atomic_set(&mddev->recovery_active, 0);
8426 pr_debug("md: resuming %s of %s from checkpoint.\n",
8427 desc, mdname(mddev));
8428 mddev->curr_resync = j;
8430 mddev->curr_resync = 3; /* no longer delayed */
8431 mddev->curr_resync_completed = j;
8432 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8433 md_new_event(mddev);
8434 update_time = jiffies;
8436 blk_start_plug(&plug);
8437 while (j < max_sectors) {
8442 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8443 ((mddev->curr_resync > mddev->curr_resync_completed &&
8444 (mddev->curr_resync - mddev->curr_resync_completed)
8445 > (max_sectors >> 4)) ||
8446 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8447 (j - mddev->curr_resync_completed)*2
8448 >= mddev->resync_max - mddev->curr_resync_completed ||
8449 mddev->curr_resync_completed > mddev->resync_max
8451 /* time to update curr_resync_completed */
8452 wait_event(mddev->recovery_wait,
8453 atomic_read(&mddev->recovery_active) == 0);
8454 mddev->curr_resync_completed = j;
8455 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8456 j > mddev->recovery_cp)
8457 mddev->recovery_cp = j;
8458 update_time = jiffies;
8459 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8460 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8463 while (j >= mddev->resync_max &&
8464 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8465 /* As this condition is controlled by user-space,
8466 * we can block indefinitely, so use '_interruptible'
8467 * to avoid triggering warnings.
8469 flush_signals(current); /* just in case */
8470 wait_event_interruptible(mddev->recovery_wait,
8471 mddev->resync_max > j
8472 || test_bit(MD_RECOVERY_INTR,
8476 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8479 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8481 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8485 if (!skipped) { /* actual IO requested */
8486 io_sectors += sectors;
8487 atomic_add(sectors, &mddev->recovery_active);
8490 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8494 if (j > max_sectors)
8495 /* when skipping, extra large numbers can be returned. */
8498 mddev->curr_resync = j;
8499 mddev->curr_mark_cnt = io_sectors;
8500 if (last_check == 0)
8501 /* this is the earliest that rebuild will be
8502 * visible in /proc/mdstat
8504 md_new_event(mddev);
8506 if (last_check + window > io_sectors || j == max_sectors)
8509 last_check = io_sectors;
8511 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8513 int next = (last_mark+1) % SYNC_MARKS;
8515 mddev->resync_mark = mark[next];
8516 mddev->resync_mark_cnt = mark_cnt[next];
8517 mark[next] = jiffies;
8518 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8522 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8526 * this loop exits only if either when we are slower than
8527 * the 'hard' speed limit, or the system was IO-idle for
8529 * the system might be non-idle CPU-wise, but we only care
8530 * about not overloading the IO subsystem. (things like an
8531 * e2fsck being done on the RAID array should execute fast)
8535 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8536 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8537 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8539 if (currspeed > speed_min(mddev)) {
8540 if (currspeed > speed_max(mddev)) {
8544 if (!is_mddev_idle(mddev, 0)) {
8546 * Give other IO more of a chance.
8547 * The faster the devices, the less we wait.
8549 wait_event(mddev->recovery_wait,
8550 !atomic_read(&mddev->recovery_active));
8554 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8555 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8556 ? "interrupted" : "done");
8558 * this also signals 'finished resyncing' to md_stop
8560 blk_finish_plug(&plug);
8561 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8563 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8564 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8565 mddev->curr_resync > 3) {
8566 mddev->curr_resync_completed = mddev->curr_resync;
8567 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8569 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8571 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8572 mddev->curr_resync > 3) {
8573 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8574 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8575 if (mddev->curr_resync >= mddev->recovery_cp) {
8576 pr_debug("md: checkpointing %s of %s.\n",
8577 desc, mdname(mddev));
8578 if (test_bit(MD_RECOVERY_ERROR,
8580 mddev->recovery_cp =
8581 mddev->curr_resync_completed;
8583 mddev->recovery_cp =
8587 mddev->recovery_cp = MaxSector;
8589 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8590 mddev->curr_resync = MaxSector;
8592 rdev_for_each_rcu(rdev, mddev)
8593 if (rdev->raid_disk >= 0 &&
8594 mddev->delta_disks >= 0 &&
8595 !test_bit(Journal, &rdev->flags) &&
8596 !test_bit(Faulty, &rdev->flags) &&
8597 !test_bit(In_sync, &rdev->flags) &&
8598 rdev->recovery_offset < mddev->curr_resync)
8599 rdev->recovery_offset = mddev->curr_resync;
8604 /* set CHANGE_PENDING here since maybe another update is needed,
8605 * so other nodes are informed. It should be harmless for normal
8607 set_mask_bits(&mddev->sb_flags, 0,
8608 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8610 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8611 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8612 mddev->delta_disks > 0 &&
8613 mddev->pers->finish_reshape &&
8614 mddev->pers->size &&
8616 mddev_lock_nointr(mddev);
8617 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8618 mddev_unlock(mddev);
8619 set_capacity(mddev->gendisk, mddev->array_sectors);
8620 revalidate_disk(mddev->gendisk);
8623 spin_lock(&mddev->lock);
8624 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8625 /* We completed so min/max setting can be forgotten if used. */
8626 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8627 mddev->resync_min = 0;
8628 mddev->resync_max = MaxSector;
8629 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8630 mddev->resync_min = mddev->curr_resync_completed;
8631 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8632 mddev->curr_resync = 0;
8633 spin_unlock(&mddev->lock);
8635 wake_up(&resync_wait);
8636 md_wakeup_thread(mddev->thread);
8639 EXPORT_SYMBOL_GPL(md_do_sync);
8641 static int remove_and_add_spares(struct mddev *mddev,
8642 struct md_rdev *this)
8644 struct md_rdev *rdev;
8647 bool remove_some = false;
8649 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8650 /* Mustn't remove devices when resync thread is running */
8653 rdev_for_each(rdev, mddev) {
8654 if ((this == NULL || rdev == this) &&
8655 rdev->raid_disk >= 0 &&
8656 !test_bit(Blocked, &rdev->flags) &&
8657 test_bit(Faulty, &rdev->flags) &&
8658 atomic_read(&rdev->nr_pending)==0) {
8659 /* Faulty non-Blocked devices with nr_pending == 0
8660 * never get nr_pending incremented,
8661 * never get Faulty cleared, and never get Blocked set.
8662 * So we can synchronize_rcu now rather than once per device
8665 set_bit(RemoveSynchronized, &rdev->flags);
8671 rdev_for_each(rdev, mddev) {
8672 if ((this == NULL || rdev == this) &&
8673 rdev->raid_disk >= 0 &&
8674 !test_bit(Blocked, &rdev->flags) &&
8675 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8676 (!test_bit(In_sync, &rdev->flags) &&
8677 !test_bit(Journal, &rdev->flags))) &&
8678 atomic_read(&rdev->nr_pending)==0)) {
8679 if (mddev->pers->hot_remove_disk(
8680 mddev, rdev) == 0) {
8681 sysfs_unlink_rdev(mddev, rdev);
8682 rdev->saved_raid_disk = rdev->raid_disk;
8683 rdev->raid_disk = -1;
8687 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8688 clear_bit(RemoveSynchronized, &rdev->flags);
8691 if (removed && mddev->kobj.sd)
8692 sysfs_notify(&mddev->kobj, NULL, "degraded");
8694 if (this && removed)
8697 rdev_for_each(rdev, mddev) {
8698 if (this && this != rdev)
8700 if (test_bit(Candidate, &rdev->flags))
8702 if (rdev->raid_disk >= 0 &&
8703 !test_bit(In_sync, &rdev->flags) &&
8704 !test_bit(Journal, &rdev->flags) &&
8705 !test_bit(Faulty, &rdev->flags))
8707 if (rdev->raid_disk >= 0)
8709 if (test_bit(Faulty, &rdev->flags))
8711 if (!test_bit(Journal, &rdev->flags)) {
8713 ! (rdev->saved_raid_disk >= 0 &&
8714 !test_bit(Bitmap_sync, &rdev->flags)))
8717 rdev->recovery_offset = 0;
8720 hot_add_disk(mddev, rdev) == 0) {
8721 if (sysfs_link_rdev(mddev, rdev))
8722 /* failure here is OK */;
8723 if (!test_bit(Journal, &rdev->flags))
8725 md_new_event(mddev);
8726 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8731 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8735 static void md_start_sync(struct work_struct *ws)
8737 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8739 mddev->sync_thread = md_register_thread(md_do_sync,
8742 if (!mddev->sync_thread) {
8743 pr_warn("%s: could not start resync thread...\n",
8745 /* leave the spares where they are, it shouldn't hurt */
8746 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8747 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8748 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8749 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8750 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8751 wake_up(&resync_wait);
8752 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8754 if (mddev->sysfs_action)
8755 sysfs_notify_dirent_safe(mddev->sysfs_action);
8757 md_wakeup_thread(mddev->sync_thread);
8758 sysfs_notify_dirent_safe(mddev->sysfs_action);
8759 md_new_event(mddev);
8763 * This routine is regularly called by all per-raid-array threads to
8764 * deal with generic issues like resync and super-block update.
8765 * Raid personalities that don't have a thread (linear/raid0) do not
8766 * need this as they never do any recovery or update the superblock.
8768 * It does not do any resync itself, but rather "forks" off other threads
8769 * to do that as needed.
8770 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8771 * "->recovery" and create a thread at ->sync_thread.
8772 * When the thread finishes it sets MD_RECOVERY_DONE
8773 * and wakeups up this thread which will reap the thread and finish up.
8774 * This thread also removes any faulty devices (with nr_pending == 0).
8776 * The overall approach is:
8777 * 1/ if the superblock needs updating, update it.
8778 * 2/ If a recovery thread is running, don't do anything else.
8779 * 3/ If recovery has finished, clean up, possibly marking spares active.
8780 * 4/ If there are any faulty devices, remove them.
8781 * 5/ If array is degraded, try to add spares devices
8782 * 6/ If array has spares or is not in-sync, start a resync thread.
8784 void md_check_recovery(struct mddev *mddev)
8786 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8787 /* Write superblock - thread that called mddev_suspend()
8788 * holds reconfig_mutex for us.
8790 set_bit(MD_UPDATING_SB, &mddev->flags);
8791 smp_mb__after_atomic();
8792 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8793 md_update_sb(mddev, 0);
8794 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8795 wake_up(&mddev->sb_wait);
8798 if (mddev->suspended)
8802 bitmap_daemon_work(mddev);
8804 if (signal_pending(current)) {
8805 if (mddev->pers->sync_request && !mddev->external) {
8806 pr_debug("md: %s in immediate safe mode\n",
8808 mddev->safemode = 2;
8810 flush_signals(current);
8813 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8816 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8817 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8818 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8819 (mddev->external == 0 && mddev->safemode == 1) ||
8820 (mddev->safemode == 2
8821 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8825 if (mddev_trylock(mddev)) {
8827 bool try_set_sync = mddev->safemode != 0;
8829 if (!mddev->external && mddev->safemode == 1)
8830 mddev->safemode = 0;
8833 struct md_rdev *rdev;
8834 if (!mddev->external && mddev->in_sync)
8835 /* 'Blocked' flag not needed as failed devices
8836 * will be recorded if array switched to read/write.
8837 * Leaving it set will prevent the device
8838 * from being removed.
8840 rdev_for_each(rdev, mddev)
8841 clear_bit(Blocked, &rdev->flags);
8842 /* On a read-only array we can:
8843 * - remove failed devices
8844 * - add already-in_sync devices if the array itself
8846 * As we only add devices that are already in-sync,
8847 * we can activate the spares immediately.
8849 remove_and_add_spares(mddev, NULL);
8850 /* There is no thread, but we need to call
8851 * ->spare_active and clear saved_raid_disk
8853 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8854 md_reap_sync_thread(mddev);
8855 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8856 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8857 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8861 if (mddev_is_clustered(mddev)) {
8862 struct md_rdev *rdev, *tmp;
8863 /* kick the device if another node issued a
8866 rdev_for_each_safe(rdev, tmp, mddev) {
8867 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8868 rdev->raid_disk < 0)
8869 md_kick_rdev_from_array(rdev);
8873 if (try_set_sync && !mddev->external && !mddev->in_sync) {
8874 spin_lock(&mddev->lock);
8876 spin_unlock(&mddev->lock);
8879 if (mddev->sb_flags)
8880 md_update_sb(mddev, 0);
8882 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8883 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8884 /* resync/recovery still happening */
8885 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8888 if (mddev->sync_thread) {
8889 md_reap_sync_thread(mddev);
8892 /* Set RUNNING before clearing NEEDED to avoid
8893 * any transients in the value of "sync_action".
8895 mddev->curr_resync_completed = 0;
8896 spin_lock(&mddev->lock);
8897 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8898 spin_unlock(&mddev->lock);
8899 /* Clear some bits that don't mean anything, but
8902 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8903 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8905 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8906 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8908 /* no recovery is running.
8909 * remove any failed drives, then
8910 * add spares if possible.
8911 * Spares are also removed and re-added, to allow
8912 * the personality to fail the re-add.
8915 if (mddev->reshape_position != MaxSector) {
8916 if (mddev->pers->check_reshape == NULL ||
8917 mddev->pers->check_reshape(mddev) != 0)
8918 /* Cannot proceed */
8920 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8921 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8922 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8923 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8924 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8925 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8926 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8927 } else if (mddev->recovery_cp < MaxSector) {
8928 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8929 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8930 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8931 /* nothing to be done ... */
8934 if (mddev->pers->sync_request) {
8936 /* We are adding a device or devices to an array
8937 * which has the bitmap stored on all devices.
8938 * So make sure all bitmap pages get written
8940 bitmap_write_all(mddev->bitmap);
8942 INIT_WORK(&mddev->del_work, md_start_sync);
8943 queue_work(md_misc_wq, &mddev->del_work);
8947 if (!mddev->sync_thread) {
8948 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8949 wake_up(&resync_wait);
8950 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8952 if (mddev->sysfs_action)
8953 sysfs_notify_dirent_safe(mddev->sysfs_action);
8956 wake_up(&mddev->sb_wait);
8957 mddev_unlock(mddev);
8960 EXPORT_SYMBOL(md_check_recovery);
8962 void md_reap_sync_thread(struct mddev *mddev)
8964 struct md_rdev *rdev;
8966 /* resync has finished, collect result */
8967 md_unregister_thread(&mddev->sync_thread);
8968 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8969 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
8970 mddev->degraded != mddev->raid_disks) {
8972 /* activate any spares */
8973 if (mddev->pers->spare_active(mddev)) {
8974 sysfs_notify(&mddev->kobj, NULL,
8976 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8979 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8980 mddev->pers->finish_reshape)
8981 mddev->pers->finish_reshape(mddev);
8983 /* If array is no-longer degraded, then any saved_raid_disk
8984 * information must be scrapped.
8986 if (!mddev->degraded)
8987 rdev_for_each(rdev, mddev)
8988 rdev->saved_raid_disk = -1;
8990 md_update_sb(mddev, 1);
8991 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8992 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8994 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8995 md_cluster_ops->resync_finish(mddev);
8996 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8997 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8998 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8999 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9000 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9001 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9002 wake_up(&resync_wait);
9003 /* flag recovery needed just to double check */
9004 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9005 sysfs_notify_dirent_safe(mddev->sysfs_action);
9006 md_new_event(mddev);
9007 if (mddev->event_work.func)
9008 queue_work(md_misc_wq, &mddev->event_work);
9010 EXPORT_SYMBOL(md_reap_sync_thread);
9012 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9014 sysfs_notify_dirent_safe(rdev->sysfs_state);
9015 wait_event_timeout(rdev->blocked_wait,
9016 !test_bit(Blocked, &rdev->flags) &&
9017 !test_bit(BlockedBadBlocks, &rdev->flags),
9018 msecs_to_jiffies(5000));
9019 rdev_dec_pending(rdev, mddev);
9021 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9023 void md_finish_reshape(struct mddev *mddev)
9025 /* called be personality module when reshape completes. */
9026 struct md_rdev *rdev;
9028 rdev_for_each(rdev, mddev) {
9029 if (rdev->data_offset > rdev->new_data_offset)
9030 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9032 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9033 rdev->data_offset = rdev->new_data_offset;
9036 EXPORT_SYMBOL(md_finish_reshape);
9038 /* Bad block management */
9040 /* Returns 1 on success, 0 on failure */
9041 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9044 struct mddev *mddev = rdev->mddev;
9047 s += rdev->new_data_offset;
9049 s += rdev->data_offset;
9050 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9052 /* Make sure they get written out promptly */
9053 if (test_bit(ExternalBbl, &rdev->flags))
9054 sysfs_notify(&rdev->kobj, NULL,
9055 "unacknowledged_bad_blocks");
9056 sysfs_notify_dirent_safe(rdev->sysfs_state);
9057 set_mask_bits(&mddev->sb_flags, 0,
9058 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9059 md_wakeup_thread(rdev->mddev->thread);
9064 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9066 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9071 s += rdev->new_data_offset;
9073 s += rdev->data_offset;
9074 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9075 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9076 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9079 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9081 static int md_notify_reboot(struct notifier_block *this,
9082 unsigned long code, void *x)
9084 struct list_head *tmp;
9085 struct mddev *mddev;
9088 for_each_mddev(mddev, tmp) {
9089 if (mddev_trylock(mddev)) {
9091 __md_stop_writes(mddev);
9092 if (mddev->persistent)
9093 mddev->safemode = 2;
9094 mddev_unlock(mddev);
9099 * certain more exotic SCSI devices are known to be
9100 * volatile wrt too early system reboots. While the
9101 * right place to handle this issue is the given
9102 * driver, we do want to have a safe RAID driver ...
9110 static struct notifier_block md_notifier = {
9111 .notifier_call = md_notify_reboot,
9113 .priority = INT_MAX, /* before any real devices */
9116 static void md_geninit(void)
9118 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9120 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9123 static int __init md_init(void)
9127 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9131 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9135 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9138 if ((ret = register_blkdev(0, "mdp")) < 0)
9142 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9143 md_probe, NULL, NULL);
9144 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9145 md_probe, NULL, NULL);
9147 register_reboot_notifier(&md_notifier);
9148 raid_table_header = register_sysctl_table(raid_root_table);
9154 unregister_blkdev(MD_MAJOR, "md");
9156 destroy_workqueue(md_misc_wq);
9158 destroy_workqueue(md_wq);
9163 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9165 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9166 struct md_rdev *rdev2, *tmp;
9168 char b[BDEVNAME_SIZE];
9171 * If size is changed in another node then we need to
9172 * do resize as well.
9174 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9175 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9177 pr_info("md-cluster: resize failed\n");
9179 bitmap_update_sb(mddev->bitmap);
9182 /* Check for change of roles in the active devices */
9183 rdev_for_each_safe(rdev2, tmp, mddev) {
9184 if (test_bit(Faulty, &rdev2->flags))
9187 /* Check if the roles changed */
9188 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9190 if (test_bit(Candidate, &rdev2->flags)) {
9191 if (role == 0xfffe) {
9192 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9193 md_kick_rdev_from_array(rdev2);
9197 clear_bit(Candidate, &rdev2->flags);
9200 if (role != rdev2->raid_disk) {
9202 if (rdev2->raid_disk == -1 && role != 0xffff) {
9203 rdev2->saved_raid_disk = role;
9204 ret = remove_and_add_spares(mddev, rdev2);
9205 pr_info("Activated spare: %s\n",
9206 bdevname(rdev2->bdev,b));
9207 /* wakeup mddev->thread here, so array could
9208 * perform resync with the new activated disk */
9209 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9210 md_wakeup_thread(mddev->thread);
9214 * We just want to do the minimum to mark the disk
9215 * as faulty. The recovery is performed by the
9216 * one who initiated the error.
9218 if ((role == 0xfffe) || (role == 0xfffd)) {
9219 md_error(mddev, rdev2);
9220 clear_bit(Blocked, &rdev2->flags);
9225 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9226 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9228 /* Finally set the event to be up to date */
9229 mddev->events = le64_to_cpu(sb->events);
9232 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9235 struct page *swapout = rdev->sb_page;
9236 struct mdp_superblock_1 *sb;
9238 /* Store the sb page of the rdev in the swapout temporary
9239 * variable in case we err in the future
9241 rdev->sb_page = NULL;
9242 err = alloc_disk_sb(rdev);
9244 ClearPageUptodate(rdev->sb_page);
9245 rdev->sb_loaded = 0;
9246 err = super_types[mddev->major_version].
9247 load_super(rdev, NULL, mddev->minor_version);
9250 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9251 __func__, __LINE__, rdev->desc_nr, err);
9253 put_page(rdev->sb_page);
9254 rdev->sb_page = swapout;
9255 rdev->sb_loaded = 1;
9259 sb = page_address(rdev->sb_page);
9260 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9264 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9265 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9267 /* The other node finished recovery, call spare_active to set
9268 * device In_sync and mddev->degraded
9270 if (rdev->recovery_offset == MaxSector &&
9271 !test_bit(In_sync, &rdev->flags) &&
9272 mddev->pers->spare_active(mddev))
9273 sysfs_notify(&mddev->kobj, NULL, "degraded");
9279 void md_reload_sb(struct mddev *mddev, int nr)
9281 struct md_rdev *rdev = NULL, *iter;
9285 rdev_for_each_rcu(iter, mddev) {
9286 if (iter->desc_nr == nr) {
9293 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9297 err = read_rdev(mddev, rdev);
9301 check_sb_changes(mddev, rdev);
9303 /* Read all rdev's to update recovery_offset */
9304 rdev_for_each_rcu(rdev, mddev)
9305 read_rdev(mddev, rdev);
9307 EXPORT_SYMBOL(md_reload_sb);
9312 * Searches all registered partitions for autorun RAID arrays
9316 static DEFINE_MUTEX(detected_devices_mutex);
9317 static LIST_HEAD(all_detected_devices);
9318 struct detected_devices_node {
9319 struct list_head list;
9323 void md_autodetect_dev(dev_t dev)
9325 struct detected_devices_node *node_detected_dev;
9327 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9328 if (node_detected_dev) {
9329 node_detected_dev->dev = dev;
9330 mutex_lock(&detected_devices_mutex);
9331 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9332 mutex_unlock(&detected_devices_mutex);
9336 static void autostart_arrays(int part)
9338 struct md_rdev *rdev;
9339 struct detected_devices_node *node_detected_dev;
9341 int i_scanned, i_passed;
9346 pr_info("md: Autodetecting RAID arrays.\n");
9348 mutex_lock(&detected_devices_mutex);
9349 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9351 node_detected_dev = list_entry(all_detected_devices.next,
9352 struct detected_devices_node, list);
9353 list_del(&node_detected_dev->list);
9354 dev = node_detected_dev->dev;
9355 kfree(node_detected_dev);
9356 mutex_unlock(&detected_devices_mutex);
9357 rdev = md_import_device(dev,0, 90);
9358 mutex_lock(&detected_devices_mutex);
9362 if (test_bit(Faulty, &rdev->flags))
9365 set_bit(AutoDetected, &rdev->flags);
9366 list_add(&rdev->same_set, &pending_raid_disks);
9369 mutex_unlock(&detected_devices_mutex);
9371 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9373 autorun_devices(part);
9376 #endif /* !MODULE */
9378 static __exit void md_exit(void)
9380 struct mddev *mddev;
9381 struct list_head *tmp;
9384 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9385 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9387 unregister_blkdev(MD_MAJOR,"md");
9388 unregister_blkdev(mdp_major, "mdp");
9389 unregister_reboot_notifier(&md_notifier);
9390 unregister_sysctl_table(raid_table_header);
9392 /* We cannot unload the modules while some process is
9393 * waiting for us in select() or poll() - wake them up
9396 while (waitqueue_active(&md_event_waiters)) {
9397 /* not safe to leave yet */
9398 wake_up(&md_event_waiters);
9402 remove_proc_entry("mdstat", NULL);
9404 for_each_mddev(mddev, tmp) {
9405 export_array(mddev);
9407 mddev->hold_active = 0;
9409 * for_each_mddev() will call mddev_put() at the end of each
9410 * iteration. As the mddev is now fully clear, this will
9411 * schedule the mddev for destruction by a workqueue, and the
9412 * destroy_workqueue() below will wait for that to complete.
9415 destroy_workqueue(md_misc_wq);
9416 destroy_workqueue(md_wq);
9419 subsys_initcall(md_init);
9420 module_exit(md_exit)
9422 static int get_ro(char *buffer, struct kernel_param *kp)
9424 return sprintf(buffer, "%d", start_readonly);
9426 static int set_ro(const char *val, struct kernel_param *kp)
9428 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9431 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9432 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9433 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9434 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9436 MODULE_LICENSE("GPL");
9437 MODULE_DESCRIPTION("MD RAID framework");
9439 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);