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 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3652 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3655 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3659 if (mddev_is_clustered(mddev)) {
3660 pr_warn("md: Safemode is disabled for clustered mode\n");
3664 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3667 mddev->safemode_delay = 0;
3669 unsigned long old_delay = mddev->safemode_delay;
3670 unsigned long new_delay = (msec*HZ)/1000;
3674 mddev->safemode_delay = new_delay;
3675 if (new_delay < old_delay || old_delay == 0)
3676 mod_timer(&mddev->safemode_timer, jiffies+1);
3680 static struct md_sysfs_entry md_safe_delay =
3681 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3684 level_show(struct mddev *mddev, char *page)
3686 struct md_personality *p;
3688 spin_lock(&mddev->lock);
3691 ret = sprintf(page, "%s\n", p->name);
3692 else if (mddev->clevel[0])
3693 ret = sprintf(page, "%s\n", mddev->clevel);
3694 else if (mddev->level != LEVEL_NONE)
3695 ret = sprintf(page, "%d\n", mddev->level);
3698 spin_unlock(&mddev->lock);
3703 level_store(struct mddev *mddev, const char *buf, size_t len)
3708 struct md_personality *pers, *oldpers;
3710 void *priv, *oldpriv;
3711 struct md_rdev *rdev;
3713 if (slen == 0 || slen >= sizeof(clevel))
3716 rv = mddev_lock(mddev);
3720 if (mddev->pers == NULL) {
3721 strncpy(mddev->clevel, buf, slen);
3722 if (mddev->clevel[slen-1] == '\n')
3724 mddev->clevel[slen] = 0;
3725 mddev->level = LEVEL_NONE;
3733 /* request to change the personality. Need to ensure:
3734 * - array is not engaged in resync/recovery/reshape
3735 * - old personality can be suspended
3736 * - new personality will access other array.
3740 if (mddev->sync_thread ||
3741 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3742 mddev->reshape_position != MaxSector ||
3743 mddev->sysfs_active)
3747 if (!mddev->pers->quiesce) {
3748 pr_warn("md: %s: %s does not support online personality change\n",
3749 mdname(mddev), mddev->pers->name);
3753 /* Now find the new personality */
3754 strncpy(clevel, buf, slen);
3755 if (clevel[slen-1] == '\n')
3758 if (kstrtol(clevel, 10, &level))
3761 if (request_module("md-%s", clevel) != 0)
3762 request_module("md-level-%s", clevel);
3763 spin_lock(&pers_lock);
3764 pers = find_pers(level, clevel);
3765 if (!pers || !try_module_get(pers->owner)) {
3766 spin_unlock(&pers_lock);
3767 pr_warn("md: personality %s not loaded\n", clevel);
3771 spin_unlock(&pers_lock);
3773 if (pers == mddev->pers) {
3774 /* Nothing to do! */
3775 module_put(pers->owner);
3779 if (!pers->takeover) {
3780 module_put(pers->owner);
3781 pr_warn("md: %s: %s does not support personality takeover\n",
3782 mdname(mddev), clevel);
3787 rdev_for_each(rdev, mddev)
3788 rdev->new_raid_disk = rdev->raid_disk;
3790 /* ->takeover must set new_* and/or delta_disks
3791 * if it succeeds, and may set them when it fails.
3793 priv = pers->takeover(mddev);
3795 mddev->new_level = mddev->level;
3796 mddev->new_layout = mddev->layout;
3797 mddev->new_chunk_sectors = mddev->chunk_sectors;
3798 mddev->raid_disks -= mddev->delta_disks;
3799 mddev->delta_disks = 0;
3800 mddev->reshape_backwards = 0;
3801 module_put(pers->owner);
3802 pr_warn("md: %s: %s would not accept array\n",
3803 mdname(mddev), clevel);
3808 /* Looks like we have a winner */
3809 mddev_suspend(mddev);
3810 mddev_detach(mddev);
3812 spin_lock(&mddev->lock);
3813 oldpers = mddev->pers;
3814 oldpriv = mddev->private;
3816 mddev->private = priv;
3817 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3818 mddev->level = mddev->new_level;
3819 mddev->layout = mddev->new_layout;
3820 mddev->chunk_sectors = mddev->new_chunk_sectors;
3821 mddev->delta_disks = 0;
3822 mddev->reshape_backwards = 0;
3823 mddev->degraded = 0;
3824 spin_unlock(&mddev->lock);
3826 if (oldpers->sync_request == NULL &&
3828 /* We are converting from a no-redundancy array
3829 * to a redundancy array and metadata is managed
3830 * externally so we need to be sure that writes
3831 * won't block due to a need to transition
3833 * until external management is started.
3836 mddev->safemode_delay = 0;
3837 mddev->safemode = 0;
3840 oldpers->free(mddev, oldpriv);
3842 if (oldpers->sync_request == NULL &&
3843 pers->sync_request != NULL) {
3844 /* need to add the md_redundancy_group */
3845 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3846 pr_warn("md: cannot register extra attributes for %s\n",
3848 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3850 if (oldpers->sync_request != NULL &&
3851 pers->sync_request == NULL) {
3852 /* need to remove the md_redundancy_group */
3853 if (mddev->to_remove == NULL)
3854 mddev->to_remove = &md_redundancy_group;
3857 module_put(oldpers->owner);
3859 rdev_for_each(rdev, mddev) {
3860 if (rdev->raid_disk < 0)
3862 if (rdev->new_raid_disk >= mddev->raid_disks)
3863 rdev->new_raid_disk = -1;
3864 if (rdev->new_raid_disk == rdev->raid_disk)
3866 sysfs_unlink_rdev(mddev, rdev);
3868 rdev_for_each(rdev, mddev) {
3869 if (rdev->raid_disk < 0)
3871 if (rdev->new_raid_disk == rdev->raid_disk)
3873 rdev->raid_disk = rdev->new_raid_disk;
3874 if (rdev->raid_disk < 0)
3875 clear_bit(In_sync, &rdev->flags);
3877 if (sysfs_link_rdev(mddev, rdev))
3878 pr_warn("md: cannot register rd%d for %s after level change\n",
3879 rdev->raid_disk, mdname(mddev));
3883 if (pers->sync_request == NULL) {
3884 /* this is now an array without redundancy, so
3885 * it must always be in_sync
3888 del_timer_sync(&mddev->safemode_timer);
3890 blk_set_stacking_limits(&mddev->queue->limits);
3892 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3893 mddev_resume(mddev);
3895 md_update_sb(mddev, 1);
3896 sysfs_notify(&mddev->kobj, NULL, "level");
3897 md_new_event(mddev);
3900 mddev_unlock(mddev);
3904 static struct md_sysfs_entry md_level =
3905 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3908 layout_show(struct mddev *mddev, char *page)
3910 /* just a number, not meaningful for all levels */
3911 if (mddev->reshape_position != MaxSector &&
3912 mddev->layout != mddev->new_layout)
3913 return sprintf(page, "%d (%d)\n",
3914 mddev->new_layout, mddev->layout);
3915 return sprintf(page, "%d\n", mddev->layout);
3919 layout_store(struct mddev *mddev, const char *buf, size_t len)
3924 err = kstrtouint(buf, 10, &n);
3927 err = mddev_lock(mddev);
3932 if (mddev->pers->check_reshape == NULL)
3937 mddev->new_layout = n;
3938 err = mddev->pers->check_reshape(mddev);
3940 mddev->new_layout = mddev->layout;
3943 mddev->new_layout = n;
3944 if (mddev->reshape_position == MaxSector)
3947 mddev_unlock(mddev);
3950 static struct md_sysfs_entry md_layout =
3951 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3954 raid_disks_show(struct mddev *mddev, char *page)
3956 if (mddev->raid_disks == 0)
3958 if (mddev->reshape_position != MaxSector &&
3959 mddev->delta_disks != 0)
3960 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3961 mddev->raid_disks - mddev->delta_disks);
3962 return sprintf(page, "%d\n", mddev->raid_disks);
3965 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3968 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3973 err = kstrtouint(buf, 10, &n);
3977 err = mddev_lock(mddev);
3981 err = update_raid_disks(mddev, n);
3982 else if (mddev->reshape_position != MaxSector) {
3983 struct md_rdev *rdev;
3984 int olddisks = mddev->raid_disks - mddev->delta_disks;
3987 rdev_for_each(rdev, mddev) {
3989 rdev->data_offset < rdev->new_data_offset)
3992 rdev->data_offset > rdev->new_data_offset)
3996 mddev->delta_disks = n - olddisks;
3997 mddev->raid_disks = n;
3998 mddev->reshape_backwards = (mddev->delta_disks < 0);
4000 mddev->raid_disks = n;
4002 mddev_unlock(mddev);
4003 return err ? err : len;
4005 static struct md_sysfs_entry md_raid_disks =
4006 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4009 chunk_size_show(struct mddev *mddev, char *page)
4011 if (mddev->reshape_position != MaxSector &&
4012 mddev->chunk_sectors != mddev->new_chunk_sectors)
4013 return sprintf(page, "%d (%d)\n",
4014 mddev->new_chunk_sectors << 9,
4015 mddev->chunk_sectors << 9);
4016 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4020 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4025 err = kstrtoul(buf, 10, &n);
4029 err = mddev_lock(mddev);
4033 if (mddev->pers->check_reshape == NULL)
4038 mddev->new_chunk_sectors = n >> 9;
4039 err = mddev->pers->check_reshape(mddev);
4041 mddev->new_chunk_sectors = mddev->chunk_sectors;
4044 mddev->new_chunk_sectors = n >> 9;
4045 if (mddev->reshape_position == MaxSector)
4046 mddev->chunk_sectors = n >> 9;
4048 mddev_unlock(mddev);
4051 static struct md_sysfs_entry md_chunk_size =
4052 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4055 resync_start_show(struct mddev *mddev, char *page)
4057 if (mddev->recovery_cp == MaxSector)
4058 return sprintf(page, "none\n");
4059 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4063 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4065 unsigned long long n;
4068 if (cmd_match(buf, "none"))
4071 err = kstrtoull(buf, 10, &n);
4074 if (n != (sector_t)n)
4078 err = mddev_lock(mddev);
4081 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4085 mddev->recovery_cp = n;
4087 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4089 mddev_unlock(mddev);
4092 static struct md_sysfs_entry md_resync_start =
4093 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4094 resync_start_show, resync_start_store);
4097 * The array state can be:
4100 * No devices, no size, no level
4101 * Equivalent to STOP_ARRAY ioctl
4103 * May have some settings, but array is not active
4104 * all IO results in error
4105 * When written, doesn't tear down array, but just stops it
4106 * suspended (not supported yet)
4107 * All IO requests will block. The array can be reconfigured.
4108 * Writing this, if accepted, will block until array is quiescent
4110 * no resync can happen. no superblocks get written.
4111 * write requests fail
4113 * like readonly, but behaves like 'clean' on a write request.
4115 * clean - no pending writes, but otherwise active.
4116 * When written to inactive array, starts without resync
4117 * If a write request arrives then
4118 * if metadata is known, mark 'dirty' and switch to 'active'.
4119 * if not known, block and switch to write-pending
4120 * If written to an active array that has pending writes, then fails.
4122 * fully active: IO and resync can be happening.
4123 * When written to inactive array, starts with resync
4126 * clean, but writes are blocked waiting for 'active' to be written.
4129 * like active, but no writes have been seen for a while (100msec).
4132 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4133 write_pending, active_idle, bad_word};
4134 static char *array_states[] = {
4135 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4136 "write-pending", "active-idle", NULL };
4138 static int match_word(const char *word, char **list)
4141 for (n=0; list[n]; n++)
4142 if (cmd_match(word, list[n]))
4148 array_state_show(struct mddev *mddev, char *page)
4150 enum array_state st = inactive;
4152 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags))
4161 spin_lock(&mddev->lock);
4162 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4164 else if (mddev->in_sync)
4166 else if (mddev->safemode)
4170 spin_unlock(&mddev->lock);
4173 if (list_empty(&mddev->disks) &&
4174 mddev->raid_disks == 0 &&
4175 mddev->dev_sectors == 0)
4180 return sprintf(page, "%s\n", array_states[st]);
4183 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4184 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4185 static int do_md_run(struct mddev *mddev);
4186 static int restart_array(struct mddev *mddev);
4189 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4192 enum array_state st = match_word(buf, array_states);
4194 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4195 /* don't take reconfig_mutex when toggling between
4198 spin_lock(&mddev->lock);
4200 restart_array(mddev);
4201 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4202 md_wakeup_thread(mddev->thread);
4203 wake_up(&mddev->sb_wait);
4204 } else /* st == clean */ {
4205 restart_array(mddev);
4206 if (!set_in_sync(mddev))
4210 sysfs_notify_dirent_safe(mddev->sysfs_state);
4211 spin_unlock(&mddev->lock);
4214 err = mddev_lock(mddev);
4222 /* stopping an active array */
4223 err = do_md_stop(mddev, 0, NULL);
4226 /* stopping an active array */
4228 err = do_md_stop(mddev, 2, NULL);
4230 err = 0; /* already inactive */
4233 break; /* not supported yet */
4236 err = md_set_readonly(mddev, NULL);
4239 set_disk_ro(mddev->gendisk, 1);
4240 err = do_md_run(mddev);
4246 err = md_set_readonly(mddev, NULL);
4247 else if (mddev->ro == 1)
4248 err = restart_array(mddev);
4251 set_disk_ro(mddev->gendisk, 0);
4255 err = do_md_run(mddev);
4260 err = restart_array(mddev);
4263 spin_lock(&mddev->lock);
4264 if (!set_in_sync(mddev))
4266 spin_unlock(&mddev->lock);
4272 err = restart_array(mddev);
4275 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4276 wake_up(&mddev->sb_wait);
4280 set_disk_ro(mddev->gendisk, 0);
4281 err = do_md_run(mddev);
4286 /* these cannot be set */
4291 if (mddev->hold_active == UNTIL_IOCTL)
4292 mddev->hold_active = 0;
4293 sysfs_notify_dirent_safe(mddev->sysfs_state);
4295 mddev_unlock(mddev);
4298 static struct md_sysfs_entry md_array_state =
4299 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4302 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4303 return sprintf(page, "%d\n",
4304 atomic_read(&mddev->max_corr_read_errors));
4308 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4313 rv = kstrtouint(buf, 10, &n);
4318 atomic_set(&mddev->max_corr_read_errors, n);
4322 static struct md_sysfs_entry max_corr_read_errors =
4323 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4324 max_corrected_read_errors_store);
4327 null_show(struct mddev *mddev, char *page)
4333 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4335 /* buf must be %d:%d\n? giving major and minor numbers */
4336 /* The new device is added to the array.
4337 * If the array has a persistent superblock, we read the
4338 * superblock to initialise info and check validity.
4339 * Otherwise, only checking done is that in bind_rdev_to_array,
4340 * which mainly checks size.
4343 int major = simple_strtoul(buf, &e, 10);
4346 struct md_rdev *rdev;
4349 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4351 minor = simple_strtoul(e+1, &e, 10);
4352 if (*e && *e != '\n')
4354 dev = MKDEV(major, minor);
4355 if (major != MAJOR(dev) ||
4356 minor != MINOR(dev))
4359 flush_workqueue(md_misc_wq);
4361 err = mddev_lock(mddev);
4364 if (mddev->persistent) {
4365 rdev = md_import_device(dev, mddev->major_version,
4366 mddev->minor_version);
4367 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4368 struct md_rdev *rdev0
4369 = list_entry(mddev->disks.next,
4370 struct md_rdev, same_set);
4371 err = super_types[mddev->major_version]
4372 .load_super(rdev, rdev0, mddev->minor_version);
4376 } else if (mddev->external)
4377 rdev = md_import_device(dev, -2, -1);
4379 rdev = md_import_device(dev, -1, -1);
4382 mddev_unlock(mddev);
4383 return PTR_ERR(rdev);
4385 err = bind_rdev_to_array(rdev, mddev);
4389 mddev_unlock(mddev);
4391 md_new_event(mddev);
4392 return err ? err : len;
4395 static struct md_sysfs_entry md_new_device =
4396 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4399 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4402 unsigned long chunk, end_chunk;
4405 err = mddev_lock(mddev);
4410 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4412 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4413 if (buf == end) break;
4414 if (*end == '-') { /* range */
4416 end_chunk = simple_strtoul(buf, &end, 0);
4417 if (buf == end) break;
4419 if (*end && !isspace(*end)) break;
4420 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4421 buf = skip_spaces(end);
4423 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4425 mddev_unlock(mddev);
4429 static struct md_sysfs_entry md_bitmap =
4430 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4433 size_show(struct mddev *mddev, char *page)
4435 return sprintf(page, "%llu\n",
4436 (unsigned long long)mddev->dev_sectors / 2);
4439 static int update_size(struct mddev *mddev, sector_t num_sectors);
4442 size_store(struct mddev *mddev, const char *buf, size_t len)
4444 /* If array is inactive, we can reduce the component size, but
4445 * not increase it (except from 0).
4446 * If array is active, we can try an on-line resize
4449 int err = strict_blocks_to_sectors(buf, §ors);
4453 err = mddev_lock(mddev);
4457 err = update_size(mddev, sectors);
4459 md_update_sb(mddev, 1);
4461 if (mddev->dev_sectors == 0 ||
4462 mddev->dev_sectors > sectors)
4463 mddev->dev_sectors = sectors;
4467 mddev_unlock(mddev);
4468 return err ? err : len;
4471 static struct md_sysfs_entry md_size =
4472 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4474 /* Metadata version.
4476 * 'none' for arrays with no metadata (good luck...)
4477 * 'external' for arrays with externally managed metadata,
4478 * or N.M for internally known formats
4481 metadata_show(struct mddev *mddev, char *page)
4483 if (mddev->persistent)
4484 return sprintf(page, "%d.%d\n",
4485 mddev->major_version, mddev->minor_version);
4486 else if (mddev->external)
4487 return sprintf(page, "external:%s\n", mddev->metadata_type);
4489 return sprintf(page, "none\n");
4493 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4498 /* Changing the details of 'external' metadata is
4499 * always permitted. Otherwise there must be
4500 * no devices attached to the array.
4503 err = mddev_lock(mddev);
4507 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4509 else if (!list_empty(&mddev->disks))
4513 if (cmd_match(buf, "none")) {
4514 mddev->persistent = 0;
4515 mddev->external = 0;
4516 mddev->major_version = 0;
4517 mddev->minor_version = 90;
4520 if (strncmp(buf, "external:", 9) == 0) {
4521 size_t namelen = len-9;
4522 if (namelen >= sizeof(mddev->metadata_type))
4523 namelen = sizeof(mddev->metadata_type)-1;
4524 strncpy(mddev->metadata_type, buf+9, namelen);
4525 mddev->metadata_type[namelen] = 0;
4526 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4527 mddev->metadata_type[--namelen] = 0;
4528 mddev->persistent = 0;
4529 mddev->external = 1;
4530 mddev->major_version = 0;
4531 mddev->minor_version = 90;
4534 major = simple_strtoul(buf, &e, 10);
4536 if (e==buf || *e != '.')
4539 minor = simple_strtoul(buf, &e, 10);
4540 if (e==buf || (*e && *e != '\n') )
4543 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4545 mddev->major_version = major;
4546 mddev->minor_version = minor;
4547 mddev->persistent = 1;
4548 mddev->external = 0;
4551 mddev_unlock(mddev);
4555 static struct md_sysfs_entry md_metadata =
4556 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4559 action_show(struct mddev *mddev, char *page)
4561 char *type = "idle";
4562 unsigned long recovery = mddev->recovery;
4563 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4565 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4566 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4567 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4569 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4570 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4572 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4576 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4578 else if (mddev->reshape_position != MaxSector)
4581 return sprintf(page, "%s\n", type);
4585 action_store(struct mddev *mddev, const char *page, size_t len)
4587 if (!mddev->pers || !mddev->pers->sync_request)
4591 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4592 if (cmd_match(page, "frozen"))
4593 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4595 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4596 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4597 mddev_lock(mddev) == 0) {
4598 flush_workqueue(md_misc_wq);
4599 if (mddev->sync_thread) {
4600 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4601 md_reap_sync_thread(mddev);
4603 mddev_unlock(mddev);
4605 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4607 else if (cmd_match(page, "resync"))
4608 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4609 else if (cmd_match(page, "recover")) {
4610 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4611 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4612 } else if (cmd_match(page, "reshape")) {
4614 if (mddev->pers->start_reshape == NULL)
4616 err = mddev_lock(mddev);
4618 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4620 } else if (mddev->reshape_position == MaxSector ||
4621 mddev->pers->check_reshape == NULL ||
4622 mddev->pers->check_reshape(mddev)) {
4623 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4624 err = mddev->pers->start_reshape(mddev);
4627 * If reshape is still in progress, and
4628 * md_check_recovery() can continue to reshape,
4629 * don't restart reshape because data can be
4630 * corrupted for raid456.
4632 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4634 mddev_unlock(mddev);
4638 sysfs_notify(&mddev->kobj, NULL, "degraded");
4640 if (cmd_match(page, "check"))
4641 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4642 else if (!cmd_match(page, "repair"))
4644 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4645 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4646 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4648 if (mddev->ro == 2) {
4649 /* A write to sync_action is enough to justify
4650 * canceling read-auto mode
4653 md_wakeup_thread(mddev->sync_thread);
4655 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4656 md_wakeup_thread(mddev->thread);
4657 sysfs_notify_dirent_safe(mddev->sysfs_action);
4661 static struct md_sysfs_entry md_scan_mode =
4662 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4665 last_sync_action_show(struct mddev *mddev, char *page)
4667 return sprintf(page, "%s\n", mddev->last_sync_action);
4670 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4673 mismatch_cnt_show(struct mddev *mddev, char *page)
4675 return sprintf(page, "%llu\n",
4676 (unsigned long long)
4677 atomic64_read(&mddev->resync_mismatches));
4680 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4683 sync_min_show(struct mddev *mddev, char *page)
4685 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4686 mddev->sync_speed_min ? "local": "system");
4690 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4695 if (strncmp(buf, "system", 6)==0) {
4698 rv = kstrtouint(buf, 10, &min);
4704 mddev->sync_speed_min = min;
4708 static struct md_sysfs_entry md_sync_min =
4709 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4712 sync_max_show(struct mddev *mddev, char *page)
4714 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4715 mddev->sync_speed_max ? "local": "system");
4719 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4724 if (strncmp(buf, "system", 6)==0) {
4727 rv = kstrtouint(buf, 10, &max);
4733 mddev->sync_speed_max = max;
4737 static struct md_sysfs_entry md_sync_max =
4738 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4741 degraded_show(struct mddev *mddev, char *page)
4743 return sprintf(page, "%d\n", mddev->degraded);
4745 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4748 sync_force_parallel_show(struct mddev *mddev, char *page)
4750 return sprintf(page, "%d\n", mddev->parallel_resync);
4754 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4758 if (kstrtol(buf, 10, &n))
4761 if (n != 0 && n != 1)
4764 mddev->parallel_resync = n;
4766 if (mddev->sync_thread)
4767 wake_up(&resync_wait);
4772 /* force parallel resync, even with shared block devices */
4773 static struct md_sysfs_entry md_sync_force_parallel =
4774 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4775 sync_force_parallel_show, sync_force_parallel_store);
4778 sync_speed_show(struct mddev *mddev, char *page)
4780 unsigned long resync, dt, db;
4781 if (mddev->curr_resync == 0)
4782 return sprintf(page, "none\n");
4783 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4784 dt = (jiffies - mddev->resync_mark) / HZ;
4786 db = resync - mddev->resync_mark_cnt;
4787 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4790 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4793 sync_completed_show(struct mddev *mddev, char *page)
4795 unsigned long long max_sectors, resync;
4797 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4798 return sprintf(page, "none\n");
4800 if (mddev->curr_resync == 1 ||
4801 mddev->curr_resync == 2)
4802 return sprintf(page, "delayed\n");
4804 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4805 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4806 max_sectors = mddev->resync_max_sectors;
4808 max_sectors = mddev->dev_sectors;
4810 resync = mddev->curr_resync_completed;
4811 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4814 static struct md_sysfs_entry md_sync_completed =
4815 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4818 min_sync_show(struct mddev *mddev, char *page)
4820 return sprintf(page, "%llu\n",
4821 (unsigned long long)mddev->resync_min);
4824 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4826 unsigned long long min;
4829 if (kstrtoull(buf, 10, &min))
4832 spin_lock(&mddev->lock);
4834 if (min > mddev->resync_max)
4838 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4841 /* Round down to multiple of 4K for safety */
4842 mddev->resync_min = round_down(min, 8);
4846 spin_unlock(&mddev->lock);
4850 static struct md_sysfs_entry md_min_sync =
4851 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4854 max_sync_show(struct mddev *mddev, char *page)
4856 if (mddev->resync_max == MaxSector)
4857 return sprintf(page, "max\n");
4859 return sprintf(page, "%llu\n",
4860 (unsigned long long)mddev->resync_max);
4863 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4866 spin_lock(&mddev->lock);
4867 if (strncmp(buf, "max", 3) == 0)
4868 mddev->resync_max = MaxSector;
4870 unsigned long long max;
4874 if (kstrtoull(buf, 10, &max))
4876 if (max < mddev->resync_min)
4880 if (max < mddev->resync_max &&
4882 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4885 /* Must be a multiple of chunk_size */
4886 chunk = mddev->chunk_sectors;
4888 sector_t temp = max;
4891 if (sector_div(temp, chunk))
4894 mddev->resync_max = max;
4896 wake_up(&mddev->recovery_wait);
4899 spin_unlock(&mddev->lock);
4903 static struct md_sysfs_entry md_max_sync =
4904 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4907 suspend_lo_show(struct mddev *mddev, char *page)
4909 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4913 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4915 unsigned long long new;
4918 err = kstrtoull(buf, 10, &new);
4921 if (new != (sector_t)new)
4924 err = mddev_lock(mddev);
4928 if (mddev->pers == NULL ||
4929 mddev->pers->quiesce == NULL)
4931 mddev_suspend(mddev);
4932 mddev->suspend_lo = new;
4933 mddev_resume(mddev);
4937 mddev_unlock(mddev);
4940 static struct md_sysfs_entry md_suspend_lo =
4941 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4944 suspend_hi_show(struct mddev *mddev, char *page)
4946 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4950 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4952 unsigned long long new;
4955 err = kstrtoull(buf, 10, &new);
4958 if (new != (sector_t)new)
4961 err = mddev_lock(mddev);
4965 if (mddev->pers == NULL)
4968 mddev_suspend(mddev);
4969 mddev->suspend_hi = new;
4970 mddev_resume(mddev);
4974 mddev_unlock(mddev);
4977 static struct md_sysfs_entry md_suspend_hi =
4978 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4981 reshape_position_show(struct mddev *mddev, char *page)
4983 if (mddev->reshape_position != MaxSector)
4984 return sprintf(page, "%llu\n",
4985 (unsigned long long)mddev->reshape_position);
4986 strcpy(page, "none\n");
4991 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4993 struct md_rdev *rdev;
4994 unsigned long long new;
4997 err = kstrtoull(buf, 10, &new);
5000 if (new != (sector_t)new)
5002 err = mddev_lock(mddev);
5008 mddev->reshape_position = new;
5009 mddev->delta_disks = 0;
5010 mddev->reshape_backwards = 0;
5011 mddev->new_level = mddev->level;
5012 mddev->new_layout = mddev->layout;
5013 mddev->new_chunk_sectors = mddev->chunk_sectors;
5014 rdev_for_each(rdev, mddev)
5015 rdev->new_data_offset = rdev->data_offset;
5018 mddev_unlock(mddev);
5022 static struct md_sysfs_entry md_reshape_position =
5023 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5024 reshape_position_store);
5027 reshape_direction_show(struct mddev *mddev, char *page)
5029 return sprintf(page, "%s\n",
5030 mddev->reshape_backwards ? "backwards" : "forwards");
5034 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5039 if (cmd_match(buf, "forwards"))
5041 else if (cmd_match(buf, "backwards"))
5045 if (mddev->reshape_backwards == backwards)
5048 err = mddev_lock(mddev);
5051 /* check if we are allowed to change */
5052 if (mddev->delta_disks)
5054 else if (mddev->persistent &&
5055 mddev->major_version == 0)
5058 mddev->reshape_backwards = backwards;
5059 mddev_unlock(mddev);
5063 static struct md_sysfs_entry md_reshape_direction =
5064 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5065 reshape_direction_store);
5068 array_size_show(struct mddev *mddev, char *page)
5070 if (mddev->external_size)
5071 return sprintf(page, "%llu\n",
5072 (unsigned long long)mddev->array_sectors/2);
5074 return sprintf(page, "default\n");
5078 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5083 err = mddev_lock(mddev);
5087 /* cluster raid doesn't support change array_sectors */
5088 if (mddev_is_clustered(mddev)) {
5089 mddev_unlock(mddev);
5093 if (strncmp(buf, "default", 7) == 0) {
5095 sectors = mddev->pers->size(mddev, 0, 0);
5097 sectors = mddev->array_sectors;
5099 mddev->external_size = 0;
5101 if (strict_blocks_to_sectors(buf, §ors) < 0)
5103 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5106 mddev->external_size = 1;
5110 mddev->array_sectors = sectors;
5112 set_capacity(mddev->gendisk, mddev->array_sectors);
5113 revalidate_disk(mddev->gendisk);
5116 mddev_unlock(mddev);
5120 static struct md_sysfs_entry md_array_size =
5121 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5125 consistency_policy_show(struct mddev *mddev, char *page)
5129 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5130 ret = sprintf(page, "journal\n");
5131 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5132 ret = sprintf(page, "ppl\n");
5133 } else if (mddev->bitmap) {
5134 ret = sprintf(page, "bitmap\n");
5135 } else if (mddev->pers) {
5136 if (mddev->pers->sync_request)
5137 ret = sprintf(page, "resync\n");
5139 ret = sprintf(page, "none\n");
5141 ret = sprintf(page, "unknown\n");
5148 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5153 if (mddev->pers->change_consistency_policy)
5154 err = mddev->pers->change_consistency_policy(mddev, buf);
5157 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5158 set_bit(MD_HAS_PPL, &mddev->flags);
5163 return err ? err : len;
5166 static struct md_sysfs_entry md_consistency_policy =
5167 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5168 consistency_policy_store);
5170 static struct attribute *md_default_attrs[] = {
5173 &md_raid_disks.attr,
5174 &md_chunk_size.attr,
5176 &md_resync_start.attr,
5178 &md_new_device.attr,
5179 &md_safe_delay.attr,
5180 &md_array_state.attr,
5181 &md_reshape_position.attr,
5182 &md_reshape_direction.attr,
5183 &md_array_size.attr,
5184 &max_corr_read_errors.attr,
5185 &md_consistency_policy.attr,
5189 static struct attribute *md_redundancy_attrs[] = {
5191 &md_last_scan_mode.attr,
5192 &md_mismatches.attr,
5195 &md_sync_speed.attr,
5196 &md_sync_force_parallel.attr,
5197 &md_sync_completed.attr,
5200 &md_suspend_lo.attr,
5201 &md_suspend_hi.attr,
5206 static struct attribute_group md_redundancy_group = {
5208 .attrs = md_redundancy_attrs,
5212 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5214 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5215 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5220 spin_lock(&all_mddevs_lock);
5221 if (list_empty(&mddev->all_mddevs)) {
5222 spin_unlock(&all_mddevs_lock);
5226 spin_unlock(&all_mddevs_lock);
5228 rv = entry->show(mddev, page);
5234 md_attr_store(struct kobject *kobj, struct attribute *attr,
5235 const char *page, size_t length)
5237 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5238 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5243 if (!capable(CAP_SYS_ADMIN))
5245 spin_lock(&all_mddevs_lock);
5246 if (list_empty(&mddev->all_mddevs)) {
5247 spin_unlock(&all_mddevs_lock);
5251 spin_unlock(&all_mddevs_lock);
5252 rv = entry->store(mddev, page, length);
5257 static void md_free(struct kobject *ko)
5259 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5261 if (mddev->sysfs_state)
5262 sysfs_put(mddev->sysfs_state);
5265 blk_cleanup_queue(mddev->queue);
5266 if (mddev->gendisk) {
5267 del_gendisk(mddev->gendisk);
5268 put_disk(mddev->gendisk);
5270 percpu_ref_exit(&mddev->writes_pending);
5275 static const struct sysfs_ops md_sysfs_ops = {
5276 .show = md_attr_show,
5277 .store = md_attr_store,
5279 static struct kobj_type md_ktype = {
5281 .sysfs_ops = &md_sysfs_ops,
5282 .default_attrs = md_default_attrs,
5287 static void mddev_delayed_delete(struct work_struct *ws)
5289 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5291 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5292 kobject_del(&mddev->kobj);
5293 kobject_put(&mddev->kobj);
5296 static void no_op(struct percpu_ref *r) {}
5298 int mddev_init_writes_pending(struct mddev *mddev)
5300 if (mddev->writes_pending.percpu_count_ptr)
5302 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5304 /* We want to start with the refcount at zero */
5305 percpu_ref_put(&mddev->writes_pending);
5308 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5310 static int md_alloc(dev_t dev, char *name)
5313 * If dev is zero, name is the name of a device to allocate with
5314 * an arbitrary minor number. It will be "md_???"
5315 * If dev is non-zero it must be a device number with a MAJOR of
5316 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5317 * the device is being created by opening a node in /dev.
5318 * If "name" is not NULL, the device is being created by
5319 * writing to /sys/module/md_mod/parameters/new_array.
5321 static DEFINE_MUTEX(disks_mutex);
5322 struct mddev *mddev = mddev_find_or_alloc(dev);
5323 struct gendisk *disk;
5332 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5333 shift = partitioned ? MdpMinorShift : 0;
5334 unit = MINOR(mddev->unit) >> shift;
5336 /* wait for any previous instance of this device to be
5337 * completely removed (mddev_delayed_delete).
5339 flush_workqueue(md_misc_wq);
5341 mutex_lock(&disks_mutex);
5347 /* Need to ensure that 'name' is not a duplicate.
5349 struct mddev *mddev2;
5350 spin_lock(&all_mddevs_lock);
5352 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5353 if (mddev2->gendisk &&
5354 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5355 spin_unlock(&all_mddevs_lock);
5358 spin_unlock(&all_mddevs_lock);
5362 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5364 mddev->hold_active = UNTIL_STOP;
5367 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5370 mddev->queue->queuedata = mddev;
5372 blk_queue_make_request(mddev->queue, md_make_request);
5373 blk_set_stacking_limits(&mddev->queue->limits);
5375 disk = alloc_disk(1 << shift);
5377 blk_cleanup_queue(mddev->queue);
5378 mddev->queue = NULL;
5381 disk->major = MAJOR(mddev->unit);
5382 disk->first_minor = unit << shift;
5384 strcpy(disk->disk_name, name);
5385 else if (partitioned)
5386 sprintf(disk->disk_name, "md_d%d", unit);
5388 sprintf(disk->disk_name, "md%d", unit);
5389 disk->fops = &md_fops;
5390 disk->private_data = mddev;
5391 disk->queue = mddev->queue;
5392 blk_queue_write_cache(mddev->queue, true, true);
5393 /* Allow extended partitions. This makes the
5394 * 'mdp' device redundant, but we can't really
5397 disk->flags |= GENHD_FL_EXT_DEVT;
5398 mddev->gendisk = disk;
5401 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5402 &disk_to_dev(disk)->kobj, "%s", "md");
5404 /* This isn't possible, but as kobject_init_and_add is marked
5405 * __must_check, we must do something with the result
5407 pr_debug("md: cannot register %s/md - name in use\n",
5411 if (mddev->kobj.sd &&
5412 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5413 pr_debug("pointless warning\n");
5415 mutex_unlock(&disks_mutex);
5416 if (!error && mddev->kobj.sd) {
5417 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5418 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5424 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5427 md_alloc(dev, NULL);
5431 static int add_named_array(const char *val, struct kernel_param *kp)
5434 * val must be "md_*" or "mdNNN".
5435 * For "md_*" we allocate an array with a large free minor number, and
5436 * set the name to val. val must not already be an active name.
5437 * For "mdNNN" we allocate an array with the minor number NNN
5438 * which must not already be in use.
5440 int len = strlen(val);
5441 char buf[DISK_NAME_LEN];
5442 unsigned long devnum;
5444 while (len && val[len-1] == '\n')
5446 if (len >= DISK_NAME_LEN)
5448 strlcpy(buf, val, len+1);
5449 if (strncmp(buf, "md_", 3) == 0)
5450 return md_alloc(0, buf);
5451 if (strncmp(buf, "md", 2) == 0 &&
5453 kstrtoul(buf+2, 10, &devnum) == 0 &&
5454 devnum <= MINORMASK)
5455 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5460 static void md_safemode_timeout(unsigned long data)
5462 struct mddev *mddev = (struct mddev *) data;
5464 mddev->safemode = 1;
5465 if (mddev->external)
5466 sysfs_notify_dirent_safe(mddev->sysfs_state);
5468 md_wakeup_thread(mddev->thread);
5471 static int start_dirty_degraded;
5473 int md_run(struct mddev *mddev)
5476 struct md_rdev *rdev;
5477 struct md_personality *pers;
5479 if (list_empty(&mddev->disks))
5480 /* cannot run an array with no devices.. */
5485 /* Cannot run until previous stop completes properly */
5486 if (mddev->sysfs_active)
5490 * Analyze all RAID superblock(s)
5492 if (!mddev->raid_disks) {
5493 if (!mddev->persistent)
5498 if (mddev->level != LEVEL_NONE)
5499 request_module("md-level-%d", mddev->level);
5500 else if (mddev->clevel[0])
5501 request_module("md-%s", mddev->clevel);
5504 * Drop all container device buffers, from now on
5505 * the only valid external interface is through the md
5508 mddev->has_superblocks = false;
5509 rdev_for_each(rdev, mddev) {
5510 if (test_bit(Faulty, &rdev->flags))
5512 sync_blockdev(rdev->bdev);
5513 invalidate_bdev(rdev->bdev);
5514 if (mddev->ro != 1 &&
5515 (bdev_read_only(rdev->bdev) ||
5516 bdev_read_only(rdev->meta_bdev))) {
5519 set_disk_ro(mddev->gendisk, 1);
5523 mddev->has_superblocks = true;
5525 /* perform some consistency tests on the device.
5526 * We don't want the data to overlap the metadata,
5527 * Internal Bitmap issues have been handled elsewhere.
5529 if (rdev->meta_bdev) {
5530 /* Nothing to check */;
5531 } else if (rdev->data_offset < rdev->sb_start) {
5532 if (mddev->dev_sectors &&
5533 rdev->data_offset + mddev->dev_sectors
5535 pr_warn("md: %s: data overlaps metadata\n",
5540 if (rdev->sb_start + rdev->sb_size/512
5541 > rdev->data_offset) {
5542 pr_warn("md: %s: metadata overlaps data\n",
5547 sysfs_notify_dirent_safe(rdev->sysfs_state);
5550 if (mddev->bio_set == NULL) {
5551 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5552 if (!mddev->bio_set)
5555 if (mddev->sync_set == NULL) {
5556 mddev->sync_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5557 if (!mddev->sync_set) {
5563 spin_lock(&pers_lock);
5564 pers = find_pers(mddev->level, mddev->clevel);
5565 if (!pers || !try_module_get(pers->owner)) {
5566 spin_unlock(&pers_lock);
5567 if (mddev->level != LEVEL_NONE)
5568 pr_warn("md: personality for level %d is not loaded!\n",
5571 pr_warn("md: personality for level %s is not loaded!\n",
5576 spin_unlock(&pers_lock);
5577 if (mddev->level != pers->level) {
5578 mddev->level = pers->level;
5579 mddev->new_level = pers->level;
5581 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5583 if (mddev->reshape_position != MaxSector &&
5584 pers->start_reshape == NULL) {
5585 /* This personality cannot handle reshaping... */
5586 module_put(pers->owner);
5591 if (pers->sync_request) {
5592 /* Warn if this is a potentially silly
5595 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5596 struct md_rdev *rdev2;
5599 rdev_for_each(rdev, mddev)
5600 rdev_for_each(rdev2, mddev) {
5602 rdev->bdev->bd_contains ==
5603 rdev2->bdev->bd_contains) {
5604 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5606 bdevname(rdev->bdev,b),
5607 bdevname(rdev2->bdev,b2));
5613 pr_warn("True protection against single-disk failure might be compromised.\n");
5616 mddev->recovery = 0;
5617 /* may be over-ridden by personality */
5618 mddev->resync_max_sectors = mddev->dev_sectors;
5620 mddev->ok_start_degraded = start_dirty_degraded;
5622 if (start_readonly && mddev->ro == 0)
5623 mddev->ro = 2; /* read-only, but switch on first write */
5626 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5627 * up mddev->thread. It is important to initialize critical
5628 * resources for mddev->thread BEFORE calling pers->run().
5630 err = pers->run(mddev);
5632 pr_warn("md: pers->run() failed ...\n");
5633 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5634 WARN_ONCE(!mddev->external_size,
5635 "%s: default size too small, but 'external_size' not in effect?\n",
5637 pr_warn("md: invalid array_size %llu > default size %llu\n",
5638 (unsigned long long)mddev->array_sectors / 2,
5639 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5642 if (err == 0 && pers->sync_request &&
5643 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5644 struct bitmap *bitmap;
5646 bitmap = bitmap_create(mddev, -1);
5647 if (IS_ERR(bitmap)) {
5648 err = PTR_ERR(bitmap);
5649 pr_warn("%s: failed to create bitmap (%d)\n",
5650 mdname(mddev), err);
5652 mddev->bitmap = bitmap;
5656 mddev_detach(mddev);
5658 pers->free(mddev, mddev->private);
5659 mddev->private = NULL;
5660 module_put(pers->owner);
5661 bitmap_destroy(mddev);
5667 rdev_for_each(rdev, mddev) {
5668 if (rdev->raid_disk >= 0 &&
5669 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5674 if (mddev->degraded)
5677 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5679 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5680 mddev->queue->backing_dev_info->congested_data = mddev;
5681 mddev->queue->backing_dev_info->congested_fn = md_congested;
5683 if (pers->sync_request) {
5684 if (mddev->kobj.sd &&
5685 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5686 pr_warn("md: cannot register extra attributes for %s\n",
5688 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5689 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5692 atomic_set(&mddev->max_corr_read_errors,
5693 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5694 mddev->safemode = 0;
5695 if (mddev_is_clustered(mddev))
5696 mddev->safemode_delay = 0;
5698 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5701 spin_lock(&mddev->lock);
5703 spin_unlock(&mddev->lock);
5704 rdev_for_each(rdev, mddev)
5705 if (rdev->raid_disk >= 0)
5706 if (sysfs_link_rdev(mddev, rdev))
5707 /* failure here is OK */;
5709 if (mddev->degraded && !mddev->ro)
5710 /* This ensures that recovering status is reported immediately
5711 * via sysfs - until a lack of spares is confirmed.
5713 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5714 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5716 if (mddev->sb_flags)
5717 md_update_sb(mddev, 0);
5719 md_new_event(mddev);
5723 if (mddev->bio_set) {
5724 bioset_free(mddev->bio_set);
5725 mddev->bio_set = NULL;
5727 if (mddev->sync_set) {
5728 bioset_free(mddev->sync_set);
5729 mddev->sync_set = NULL;
5734 EXPORT_SYMBOL_GPL(md_run);
5736 static int do_md_run(struct mddev *mddev)
5740 set_bit(MD_NOT_READY, &mddev->flags);
5741 err = md_run(mddev);
5744 err = bitmap_load(mddev);
5746 bitmap_destroy(mddev);
5750 if (mddev_is_clustered(mddev))
5751 md_allow_write(mddev);
5753 md_wakeup_thread(mddev->thread);
5754 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5756 set_capacity(mddev->gendisk, mddev->array_sectors);
5757 revalidate_disk(mddev->gendisk);
5758 clear_bit(MD_NOT_READY, &mddev->flags);
5760 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5761 sysfs_notify_dirent_safe(mddev->sysfs_state);
5762 sysfs_notify_dirent_safe(mddev->sysfs_action);
5763 sysfs_notify(&mddev->kobj, NULL, "degraded");
5765 clear_bit(MD_NOT_READY, &mddev->flags);
5769 static int restart_array(struct mddev *mddev)
5771 struct gendisk *disk = mddev->gendisk;
5772 struct md_rdev *rdev;
5773 bool has_journal = false;
5774 bool has_readonly = false;
5776 /* Complain if it has no devices */
5777 if (list_empty(&mddev->disks))
5785 rdev_for_each_rcu(rdev, mddev) {
5786 if (test_bit(Journal, &rdev->flags) &&
5787 !test_bit(Faulty, &rdev->flags))
5789 if (bdev_read_only(rdev->bdev))
5790 has_readonly = true;
5793 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5794 /* Don't restart rw with journal missing/faulty */
5799 mddev->safemode = 0;
5801 set_disk_ro(disk, 0);
5802 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5803 /* Kick recovery or resync if necessary */
5804 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5805 md_wakeup_thread(mddev->thread);
5806 md_wakeup_thread(mddev->sync_thread);
5807 sysfs_notify_dirent_safe(mddev->sysfs_state);
5811 static void md_clean(struct mddev *mddev)
5813 mddev->array_sectors = 0;
5814 mddev->external_size = 0;
5815 mddev->dev_sectors = 0;
5816 mddev->raid_disks = 0;
5817 mddev->recovery_cp = 0;
5818 mddev->resync_min = 0;
5819 mddev->resync_max = MaxSector;
5820 mddev->reshape_position = MaxSector;
5821 mddev->external = 0;
5822 mddev->persistent = 0;
5823 mddev->level = LEVEL_NONE;
5824 mddev->clevel[0] = 0;
5826 mddev->sb_flags = 0;
5828 mddev->metadata_type[0] = 0;
5829 mddev->chunk_sectors = 0;
5830 mddev->ctime = mddev->utime = 0;
5832 mddev->max_disks = 0;
5834 mddev->can_decrease_events = 0;
5835 mddev->delta_disks = 0;
5836 mddev->reshape_backwards = 0;
5837 mddev->new_level = LEVEL_NONE;
5838 mddev->new_layout = 0;
5839 mddev->new_chunk_sectors = 0;
5840 mddev->curr_resync = 0;
5841 atomic64_set(&mddev->resync_mismatches, 0);
5842 mddev->suspend_lo = mddev->suspend_hi = 0;
5843 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5844 mddev->recovery = 0;
5847 mddev->degraded = 0;
5848 mddev->safemode = 0;
5849 mddev->private = NULL;
5850 mddev->cluster_info = NULL;
5851 mddev->bitmap_info.offset = 0;
5852 mddev->bitmap_info.default_offset = 0;
5853 mddev->bitmap_info.default_space = 0;
5854 mddev->bitmap_info.chunksize = 0;
5855 mddev->bitmap_info.daemon_sleep = 0;
5856 mddev->bitmap_info.max_write_behind = 0;
5857 mddev->bitmap_info.nodes = 0;
5860 static void __md_stop_writes(struct mddev *mddev)
5862 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5863 flush_workqueue(md_misc_wq);
5864 if (mddev->sync_thread) {
5865 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5866 md_reap_sync_thread(mddev);
5869 del_timer_sync(&mddev->safemode_timer);
5871 if (mddev->pers && mddev->pers->quiesce) {
5872 mddev->pers->quiesce(mddev, 1);
5873 mddev->pers->quiesce(mddev, 0);
5875 bitmap_flush(mddev);
5877 if (mddev->ro == 0 &&
5878 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5880 /* mark array as shutdown cleanly */
5881 if (!mddev_is_clustered(mddev))
5883 md_update_sb(mddev, 1);
5887 void md_stop_writes(struct mddev *mddev)
5889 mddev_lock_nointr(mddev);
5890 __md_stop_writes(mddev);
5891 mddev_unlock(mddev);
5893 EXPORT_SYMBOL_GPL(md_stop_writes);
5895 static void mddev_detach(struct mddev *mddev)
5897 bitmap_wait_behind_writes(mddev);
5898 if (mddev->pers && mddev->pers->quiesce) {
5899 mddev->pers->quiesce(mddev, 1);
5900 mddev->pers->quiesce(mddev, 0);
5902 md_unregister_thread(&mddev->thread);
5904 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5907 static void __md_stop(struct mddev *mddev)
5909 struct md_personality *pers = mddev->pers;
5910 bitmap_destroy(mddev);
5911 mddev_detach(mddev);
5912 /* Ensure ->event_work is done */
5913 flush_workqueue(md_misc_wq);
5914 spin_lock(&mddev->lock);
5916 spin_unlock(&mddev->lock);
5917 pers->free(mddev, mddev->private);
5918 mddev->private = NULL;
5919 if (pers->sync_request && mddev->to_remove == NULL)
5920 mddev->to_remove = &md_redundancy_group;
5921 module_put(pers->owner);
5922 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5925 void md_stop(struct mddev *mddev)
5927 /* stop the array and free an attached data structures.
5928 * This is called from dm-raid
5930 __md_stop_writes(mddev);
5933 bioset_free(mddev->bio_set);
5936 EXPORT_SYMBOL_GPL(md_stop);
5938 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5943 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5945 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5946 md_wakeup_thread(mddev->thread);
5948 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5949 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5950 if (mddev->sync_thread)
5951 /* Thread might be blocked waiting for metadata update
5952 * which will now never happen */
5953 wake_up_process(mddev->sync_thread->tsk);
5955 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5957 mddev_unlock(mddev);
5958 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5960 wait_event(mddev->sb_wait,
5961 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5962 mddev_lock_nointr(mddev);
5964 mutex_lock(&mddev->open_mutex);
5965 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5966 mddev->sync_thread ||
5967 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5968 pr_warn("md: %s still in use.\n",mdname(mddev));
5970 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5971 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5972 md_wakeup_thread(mddev->thread);
5978 __md_stop_writes(mddev);
5984 set_disk_ro(mddev->gendisk, 1);
5985 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5986 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5987 md_wakeup_thread(mddev->thread);
5988 sysfs_notify_dirent_safe(mddev->sysfs_state);
5992 mutex_unlock(&mddev->open_mutex);
5997 * 0 - completely stop and dis-assemble array
5998 * 2 - stop but do not disassemble array
6000 static int do_md_stop(struct mddev *mddev, int mode,
6001 struct block_device *bdev)
6003 struct gendisk *disk = mddev->gendisk;
6004 struct md_rdev *rdev;
6007 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6009 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6010 md_wakeup_thread(mddev->thread);
6012 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6013 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6014 if (mddev->sync_thread)
6015 /* Thread might be blocked waiting for metadata update
6016 * which will now never happen */
6017 wake_up_process(mddev->sync_thread->tsk);
6019 mddev_unlock(mddev);
6020 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6021 !test_bit(MD_RECOVERY_RUNNING,
6022 &mddev->recovery)));
6023 mddev_lock_nointr(mddev);
6025 mutex_lock(&mddev->open_mutex);
6026 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6027 mddev->sysfs_active ||
6028 mddev->sync_thread ||
6029 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6030 pr_warn("md: %s still in use.\n",mdname(mddev));
6031 mutex_unlock(&mddev->open_mutex);
6033 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6034 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6035 md_wakeup_thread(mddev->thread);
6041 set_disk_ro(disk, 0);
6043 __md_stop_writes(mddev);
6045 mddev->queue->backing_dev_info->congested_fn = NULL;
6047 /* tell userspace to handle 'inactive' */
6048 sysfs_notify_dirent_safe(mddev->sysfs_state);
6050 rdev_for_each(rdev, mddev)
6051 if (rdev->raid_disk >= 0)
6052 sysfs_unlink_rdev(mddev, rdev);
6054 set_capacity(disk, 0);
6055 mutex_unlock(&mddev->open_mutex);
6057 revalidate_disk(disk);
6062 mutex_unlock(&mddev->open_mutex);
6064 * Free resources if final stop
6067 pr_info("md: %s stopped.\n", mdname(mddev));
6069 if (mddev->bitmap_info.file) {
6070 struct file *f = mddev->bitmap_info.file;
6071 spin_lock(&mddev->lock);
6072 mddev->bitmap_info.file = NULL;
6073 spin_unlock(&mddev->lock);
6076 mddev->bitmap_info.offset = 0;
6078 export_array(mddev);
6081 if (mddev->hold_active == UNTIL_STOP)
6082 mddev->hold_active = 0;
6084 md_new_event(mddev);
6085 sysfs_notify_dirent_safe(mddev->sysfs_state);
6090 static void autorun_array(struct mddev *mddev)
6092 struct md_rdev *rdev;
6095 if (list_empty(&mddev->disks))
6098 pr_info("md: running: ");
6100 rdev_for_each(rdev, mddev) {
6101 char b[BDEVNAME_SIZE];
6102 pr_cont("<%s>", bdevname(rdev->bdev,b));
6106 err = do_md_run(mddev);
6108 pr_warn("md: do_md_run() returned %d\n", err);
6109 do_md_stop(mddev, 0, NULL);
6114 * lets try to run arrays based on all disks that have arrived
6115 * until now. (those are in pending_raid_disks)
6117 * the method: pick the first pending disk, collect all disks with
6118 * the same UUID, remove all from the pending list and put them into
6119 * the 'same_array' list. Then order this list based on superblock
6120 * update time (freshest comes first), kick out 'old' disks and
6121 * compare superblocks. If everything's fine then run it.
6123 * If "unit" is allocated, then bump its reference count
6125 static void autorun_devices(int part)
6127 struct md_rdev *rdev0, *rdev, *tmp;
6128 struct mddev *mddev;
6129 char b[BDEVNAME_SIZE];
6131 pr_info("md: autorun ...\n");
6132 while (!list_empty(&pending_raid_disks)) {
6135 LIST_HEAD(candidates);
6136 rdev0 = list_entry(pending_raid_disks.next,
6137 struct md_rdev, same_set);
6139 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6140 INIT_LIST_HEAD(&candidates);
6141 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6142 if (super_90_load(rdev, rdev0, 0) >= 0) {
6143 pr_debug("md: adding %s ...\n",
6144 bdevname(rdev->bdev,b));
6145 list_move(&rdev->same_set, &candidates);
6148 * now we have a set of devices, with all of them having
6149 * mostly sane superblocks. It's time to allocate the
6153 dev = MKDEV(mdp_major,
6154 rdev0->preferred_minor << MdpMinorShift);
6155 unit = MINOR(dev) >> MdpMinorShift;
6157 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6160 if (rdev0->preferred_minor != unit) {
6161 pr_warn("md: unit number in %s is bad: %d\n",
6162 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6166 md_probe(dev, NULL, NULL);
6167 mddev = mddev_find(dev);
6171 if (mddev_lock(mddev))
6172 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6173 else if (mddev->raid_disks || mddev->major_version
6174 || !list_empty(&mddev->disks)) {
6175 pr_warn("md: %s already running, cannot run %s\n",
6176 mdname(mddev), bdevname(rdev0->bdev,b));
6177 mddev_unlock(mddev);
6179 pr_debug("md: created %s\n", mdname(mddev));
6180 mddev->persistent = 1;
6181 rdev_for_each_list(rdev, tmp, &candidates) {
6182 list_del_init(&rdev->same_set);
6183 if (bind_rdev_to_array(rdev, mddev))
6186 autorun_array(mddev);
6187 mddev_unlock(mddev);
6189 /* on success, candidates will be empty, on error
6192 rdev_for_each_list(rdev, tmp, &candidates) {
6193 list_del_init(&rdev->same_set);
6198 pr_info("md: ... autorun DONE.\n");
6200 #endif /* !MODULE */
6202 static int get_version(void __user *arg)
6206 ver.major = MD_MAJOR_VERSION;
6207 ver.minor = MD_MINOR_VERSION;
6208 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6210 if (copy_to_user(arg, &ver, sizeof(ver)))
6216 static int get_array_info(struct mddev *mddev, void __user *arg)
6218 mdu_array_info_t info;
6219 int nr,working,insync,failed,spare;
6220 struct md_rdev *rdev;
6222 nr = working = insync = failed = spare = 0;
6224 rdev_for_each_rcu(rdev, mddev) {
6226 if (test_bit(Faulty, &rdev->flags))
6230 if (test_bit(In_sync, &rdev->flags))
6232 else if (test_bit(Journal, &rdev->flags))
6233 /* TODO: add journal count to md_u.h */
6241 info.major_version = mddev->major_version;
6242 info.minor_version = mddev->minor_version;
6243 info.patch_version = MD_PATCHLEVEL_VERSION;
6244 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6245 info.level = mddev->level;
6246 info.size = mddev->dev_sectors / 2;
6247 if (info.size != mddev->dev_sectors / 2) /* overflow */
6250 info.raid_disks = mddev->raid_disks;
6251 info.md_minor = mddev->md_minor;
6252 info.not_persistent= !mddev->persistent;
6254 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6257 info.state = (1<<MD_SB_CLEAN);
6258 if (mddev->bitmap && mddev->bitmap_info.offset)
6259 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6260 if (mddev_is_clustered(mddev))
6261 info.state |= (1<<MD_SB_CLUSTERED);
6262 info.active_disks = insync;
6263 info.working_disks = working;
6264 info.failed_disks = failed;
6265 info.spare_disks = spare;
6267 info.layout = mddev->layout;
6268 info.chunk_size = mddev->chunk_sectors << 9;
6270 if (copy_to_user(arg, &info, sizeof(info)))
6276 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6278 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6282 file = kzalloc(sizeof(*file), GFP_NOIO);
6287 spin_lock(&mddev->lock);
6288 /* bitmap enabled */
6289 if (mddev->bitmap_info.file) {
6290 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6291 sizeof(file->pathname));
6295 memmove(file->pathname, ptr,
6296 sizeof(file->pathname)-(ptr-file->pathname));
6298 spin_unlock(&mddev->lock);
6301 copy_to_user(arg, file, sizeof(*file)))
6308 static int get_disk_info(struct mddev *mddev, void __user * arg)
6310 mdu_disk_info_t info;
6311 struct md_rdev *rdev;
6313 if (copy_from_user(&info, arg, sizeof(info)))
6317 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6319 info.major = MAJOR(rdev->bdev->bd_dev);
6320 info.minor = MINOR(rdev->bdev->bd_dev);
6321 info.raid_disk = rdev->raid_disk;
6323 if (test_bit(Faulty, &rdev->flags))
6324 info.state |= (1<<MD_DISK_FAULTY);
6325 else if (test_bit(In_sync, &rdev->flags)) {
6326 info.state |= (1<<MD_DISK_ACTIVE);
6327 info.state |= (1<<MD_DISK_SYNC);
6329 if (test_bit(Journal, &rdev->flags))
6330 info.state |= (1<<MD_DISK_JOURNAL);
6331 if (test_bit(WriteMostly, &rdev->flags))
6332 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6333 if (test_bit(FailFast, &rdev->flags))
6334 info.state |= (1<<MD_DISK_FAILFAST);
6336 info.major = info.minor = 0;
6337 info.raid_disk = -1;
6338 info.state = (1<<MD_DISK_REMOVED);
6342 if (copy_to_user(arg, &info, sizeof(info)))
6348 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6350 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6351 struct md_rdev *rdev;
6352 dev_t dev = MKDEV(info->major,info->minor);
6354 if (mddev_is_clustered(mddev) &&
6355 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6356 pr_warn("%s: Cannot add to clustered mddev.\n",
6361 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6364 if (!mddev->raid_disks) {
6366 /* expecting a device which has a superblock */
6367 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6369 pr_warn("md: md_import_device returned %ld\n",
6371 return PTR_ERR(rdev);
6373 if (!list_empty(&mddev->disks)) {
6374 struct md_rdev *rdev0
6375 = list_entry(mddev->disks.next,
6376 struct md_rdev, same_set);
6377 err = super_types[mddev->major_version]
6378 .load_super(rdev, rdev0, mddev->minor_version);
6380 pr_warn("md: %s has different UUID to %s\n",
6381 bdevname(rdev->bdev,b),
6382 bdevname(rdev0->bdev,b2));
6387 err = bind_rdev_to_array(rdev, mddev);
6394 * add_new_disk can be used once the array is assembled
6395 * to add "hot spares". They must already have a superblock
6400 if (!mddev->pers->hot_add_disk) {
6401 pr_warn("%s: personality does not support diskops!\n",
6405 if (mddev->persistent)
6406 rdev = md_import_device(dev, mddev->major_version,
6407 mddev->minor_version);
6409 rdev = md_import_device(dev, -1, -1);
6411 pr_warn("md: md_import_device returned %ld\n",
6413 return PTR_ERR(rdev);
6415 /* set saved_raid_disk if appropriate */
6416 if (!mddev->persistent) {
6417 if (info->state & (1<<MD_DISK_SYNC) &&
6418 info->raid_disk < mddev->raid_disks) {
6419 rdev->raid_disk = info->raid_disk;
6420 set_bit(In_sync, &rdev->flags);
6421 clear_bit(Bitmap_sync, &rdev->flags);
6423 rdev->raid_disk = -1;
6424 rdev->saved_raid_disk = rdev->raid_disk;
6426 super_types[mddev->major_version].
6427 validate_super(mddev, rdev);
6428 if ((info->state & (1<<MD_DISK_SYNC)) &&
6429 rdev->raid_disk != info->raid_disk) {
6430 /* This was a hot-add request, but events doesn't
6431 * match, so reject it.
6437 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6438 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6439 set_bit(WriteMostly, &rdev->flags);
6441 clear_bit(WriteMostly, &rdev->flags);
6442 if (info->state & (1<<MD_DISK_FAILFAST))
6443 set_bit(FailFast, &rdev->flags);
6445 clear_bit(FailFast, &rdev->flags);
6447 if (info->state & (1<<MD_DISK_JOURNAL)) {
6448 struct md_rdev *rdev2;
6449 bool has_journal = false;
6451 /* make sure no existing journal disk */
6452 rdev_for_each(rdev2, mddev) {
6453 if (test_bit(Journal, &rdev2->flags)) {
6458 if (has_journal || mddev->bitmap) {
6462 set_bit(Journal, &rdev->flags);
6465 * check whether the device shows up in other nodes
6467 if (mddev_is_clustered(mddev)) {
6468 if (info->state & (1 << MD_DISK_CANDIDATE))
6469 set_bit(Candidate, &rdev->flags);
6470 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6471 /* --add initiated by this node */
6472 err = md_cluster_ops->add_new_disk(mddev, rdev);
6480 rdev->raid_disk = -1;
6481 err = bind_rdev_to_array(rdev, mddev);
6486 if (mddev_is_clustered(mddev)) {
6487 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6489 err = md_cluster_ops->new_disk_ack(mddev,
6492 md_kick_rdev_from_array(rdev);
6496 md_cluster_ops->add_new_disk_cancel(mddev);
6498 err = add_bound_rdev(rdev);
6502 err = add_bound_rdev(rdev);
6507 /* otherwise, add_new_disk is only allowed
6508 * for major_version==0 superblocks
6510 if (mddev->major_version != 0) {
6511 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6515 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6517 rdev = md_import_device(dev, -1, 0);
6519 pr_warn("md: error, md_import_device() returned %ld\n",
6521 return PTR_ERR(rdev);
6523 rdev->desc_nr = info->number;
6524 if (info->raid_disk < mddev->raid_disks)
6525 rdev->raid_disk = info->raid_disk;
6527 rdev->raid_disk = -1;
6529 if (rdev->raid_disk < mddev->raid_disks)
6530 if (info->state & (1<<MD_DISK_SYNC))
6531 set_bit(In_sync, &rdev->flags);
6533 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6534 set_bit(WriteMostly, &rdev->flags);
6535 if (info->state & (1<<MD_DISK_FAILFAST))
6536 set_bit(FailFast, &rdev->flags);
6538 if (!mddev->persistent) {
6539 pr_debug("md: nonpersistent superblock ...\n");
6540 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6542 rdev->sb_start = calc_dev_sboffset(rdev);
6543 rdev->sectors = rdev->sb_start;
6545 err = bind_rdev_to_array(rdev, mddev);
6555 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6557 char b[BDEVNAME_SIZE];
6558 struct md_rdev *rdev;
6563 rdev = find_rdev(mddev, dev);
6567 if (rdev->raid_disk < 0)
6570 clear_bit(Blocked, &rdev->flags);
6571 remove_and_add_spares(mddev, rdev);
6573 if (rdev->raid_disk >= 0)
6577 if (mddev_is_clustered(mddev)) {
6578 if (md_cluster_ops->remove_disk(mddev, rdev))
6582 md_kick_rdev_from_array(rdev);
6583 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6585 md_wakeup_thread(mddev->thread);
6587 md_update_sb(mddev, 1);
6588 md_new_event(mddev);
6592 pr_debug("md: cannot remove active disk %s from %s ...\n",
6593 bdevname(rdev->bdev,b), mdname(mddev));
6597 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6599 char b[BDEVNAME_SIZE];
6601 struct md_rdev *rdev;
6606 if (mddev->major_version != 0) {
6607 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6611 if (!mddev->pers->hot_add_disk) {
6612 pr_warn("%s: personality does not support diskops!\n",
6617 rdev = md_import_device(dev, -1, 0);
6619 pr_warn("md: error, md_import_device() returned %ld\n",
6624 if (mddev->persistent)
6625 rdev->sb_start = calc_dev_sboffset(rdev);
6627 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6629 rdev->sectors = rdev->sb_start;
6631 if (test_bit(Faulty, &rdev->flags)) {
6632 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6633 bdevname(rdev->bdev,b), mdname(mddev));
6638 clear_bit(In_sync, &rdev->flags);
6640 rdev->saved_raid_disk = -1;
6641 err = bind_rdev_to_array(rdev, mddev);
6646 * The rest should better be atomic, we can have disk failures
6647 * noticed in interrupt contexts ...
6650 rdev->raid_disk = -1;
6652 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6654 md_update_sb(mddev, 1);
6656 * Kick recovery, maybe this spare has to be added to the
6657 * array immediately.
6659 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6660 md_wakeup_thread(mddev->thread);
6661 md_new_event(mddev);
6669 static int set_bitmap_file(struct mddev *mddev, int fd)
6674 if (!mddev->pers->quiesce || !mddev->thread)
6676 if (mddev->recovery || mddev->sync_thread)
6678 /* we should be able to change the bitmap.. */
6682 struct inode *inode;
6685 if (mddev->bitmap || mddev->bitmap_info.file)
6686 return -EEXIST; /* cannot add when bitmap is present */
6690 pr_warn("%s: error: failed to get bitmap file\n",
6695 inode = f->f_mapping->host;
6696 if (!S_ISREG(inode->i_mode)) {
6697 pr_warn("%s: error: bitmap file must be a regular file\n",
6700 } else if (!(f->f_mode & FMODE_WRITE)) {
6701 pr_warn("%s: error: bitmap file must open for write\n",
6704 } else if (atomic_read(&inode->i_writecount) != 1) {
6705 pr_warn("%s: error: bitmap file is already in use\n",
6713 mddev->bitmap_info.file = f;
6714 mddev->bitmap_info.offset = 0; /* file overrides offset */
6715 } else if (mddev->bitmap == NULL)
6716 return -ENOENT; /* cannot remove what isn't there */
6720 struct bitmap *bitmap;
6722 bitmap = bitmap_create(mddev, -1);
6723 mddev_suspend(mddev);
6724 if (!IS_ERR(bitmap)) {
6725 mddev->bitmap = bitmap;
6726 err = bitmap_load(mddev);
6728 err = PTR_ERR(bitmap);
6730 bitmap_destroy(mddev);
6733 mddev_resume(mddev);
6734 } else if (fd < 0) {
6735 mddev_suspend(mddev);
6736 bitmap_destroy(mddev);
6737 mddev_resume(mddev);
6741 struct file *f = mddev->bitmap_info.file;
6743 spin_lock(&mddev->lock);
6744 mddev->bitmap_info.file = NULL;
6745 spin_unlock(&mddev->lock);
6754 * set_array_info is used two different ways
6755 * The original usage is when creating a new array.
6756 * In this usage, raid_disks is > 0 and it together with
6757 * level, size, not_persistent,layout,chunksize determine the
6758 * shape of the array.
6759 * This will always create an array with a type-0.90.0 superblock.
6760 * The newer usage is when assembling an array.
6761 * In this case raid_disks will be 0, and the major_version field is
6762 * use to determine which style super-blocks are to be found on the devices.
6763 * The minor and patch _version numbers are also kept incase the
6764 * super_block handler wishes to interpret them.
6766 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6769 if (info->raid_disks == 0) {
6770 /* just setting version number for superblock loading */
6771 if (info->major_version < 0 ||
6772 info->major_version >= ARRAY_SIZE(super_types) ||
6773 super_types[info->major_version].name == NULL) {
6774 /* maybe try to auto-load a module? */
6775 pr_warn("md: superblock version %d not known\n",
6776 info->major_version);
6779 mddev->major_version = info->major_version;
6780 mddev->minor_version = info->minor_version;
6781 mddev->patch_version = info->patch_version;
6782 mddev->persistent = !info->not_persistent;
6783 /* ensure mddev_put doesn't delete this now that there
6784 * is some minimal configuration.
6786 mddev->ctime = ktime_get_real_seconds();
6789 mddev->major_version = MD_MAJOR_VERSION;
6790 mddev->minor_version = MD_MINOR_VERSION;
6791 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6792 mddev->ctime = ktime_get_real_seconds();
6794 mddev->level = info->level;
6795 mddev->clevel[0] = 0;
6796 mddev->dev_sectors = 2 * (sector_t)info->size;
6797 mddev->raid_disks = info->raid_disks;
6798 /* don't set md_minor, it is determined by which /dev/md* was
6801 if (info->state & (1<<MD_SB_CLEAN))
6802 mddev->recovery_cp = MaxSector;
6804 mddev->recovery_cp = 0;
6805 mddev->persistent = ! info->not_persistent;
6806 mddev->external = 0;
6808 mddev->layout = info->layout;
6809 if (mddev->level == 0)
6810 /* Cannot trust RAID0 layout info here */
6812 mddev->chunk_sectors = info->chunk_size >> 9;
6814 if (mddev->persistent) {
6815 mddev->max_disks = MD_SB_DISKS;
6817 mddev->sb_flags = 0;
6819 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6821 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6822 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6823 mddev->bitmap_info.offset = 0;
6825 mddev->reshape_position = MaxSector;
6828 * Generate a 128 bit UUID
6830 get_random_bytes(mddev->uuid, 16);
6832 mddev->new_level = mddev->level;
6833 mddev->new_chunk_sectors = mddev->chunk_sectors;
6834 mddev->new_layout = mddev->layout;
6835 mddev->delta_disks = 0;
6836 mddev->reshape_backwards = 0;
6841 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6843 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6845 if (mddev->external_size)
6848 mddev->array_sectors = array_sectors;
6850 EXPORT_SYMBOL(md_set_array_sectors);
6852 static int update_size(struct mddev *mddev, sector_t num_sectors)
6854 struct md_rdev *rdev;
6856 int fit = (num_sectors == 0);
6857 sector_t old_dev_sectors = mddev->dev_sectors;
6859 if (mddev->pers->resize == NULL)
6861 /* The "num_sectors" is the number of sectors of each device that
6862 * is used. This can only make sense for arrays with redundancy.
6863 * linear and raid0 always use whatever space is available. We can only
6864 * consider changing this number if no resync or reconstruction is
6865 * happening, and if the new size is acceptable. It must fit before the
6866 * sb_start or, if that is <data_offset, it must fit before the size
6867 * of each device. If num_sectors is zero, we find the largest size
6870 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6876 rdev_for_each(rdev, mddev) {
6877 sector_t avail = rdev->sectors;
6879 if (fit && (num_sectors == 0 || num_sectors > avail))
6880 num_sectors = avail;
6881 if (avail < num_sectors)
6884 rv = mddev->pers->resize(mddev, num_sectors);
6886 if (mddev_is_clustered(mddev))
6887 md_cluster_ops->update_size(mddev, old_dev_sectors);
6888 else if (mddev->queue) {
6889 set_capacity(mddev->gendisk, mddev->array_sectors);
6890 revalidate_disk(mddev->gendisk);
6896 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6899 struct md_rdev *rdev;
6900 /* change the number of raid disks */
6901 if (mddev->pers->check_reshape == NULL)
6905 if (raid_disks <= 0 ||
6906 (mddev->max_disks && raid_disks >= mddev->max_disks))
6908 if (mddev->sync_thread ||
6909 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6910 mddev->reshape_position != MaxSector)
6913 rdev_for_each(rdev, mddev) {
6914 if (mddev->raid_disks < raid_disks &&
6915 rdev->data_offset < rdev->new_data_offset)
6917 if (mddev->raid_disks > raid_disks &&
6918 rdev->data_offset > rdev->new_data_offset)
6922 mddev->delta_disks = raid_disks - mddev->raid_disks;
6923 if (mddev->delta_disks < 0)
6924 mddev->reshape_backwards = 1;
6925 else if (mddev->delta_disks > 0)
6926 mddev->reshape_backwards = 0;
6928 rv = mddev->pers->check_reshape(mddev);
6930 mddev->delta_disks = 0;
6931 mddev->reshape_backwards = 0;
6937 * update_array_info is used to change the configuration of an
6939 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6940 * fields in the info are checked against the array.
6941 * Any differences that cannot be handled will cause an error.
6942 * Normally, only one change can be managed at a time.
6944 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6950 /* calculate expected state,ignoring low bits */
6951 if (mddev->bitmap && mddev->bitmap_info.offset)
6952 state |= (1 << MD_SB_BITMAP_PRESENT);
6954 if (mddev->major_version != info->major_version ||
6955 mddev->minor_version != info->minor_version ||
6956 /* mddev->patch_version != info->patch_version || */
6957 mddev->ctime != info->ctime ||
6958 mddev->level != info->level ||
6959 /* mddev->layout != info->layout || */
6960 mddev->persistent != !info->not_persistent ||
6961 mddev->chunk_sectors != info->chunk_size >> 9 ||
6962 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6963 ((state^info->state) & 0xfffffe00)
6966 /* Check there is only one change */
6967 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6969 if (mddev->raid_disks != info->raid_disks)
6971 if (mddev->layout != info->layout)
6973 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6980 if (mddev->layout != info->layout) {
6982 * we don't need to do anything at the md level, the
6983 * personality will take care of it all.
6985 if (mddev->pers->check_reshape == NULL)
6988 mddev->new_layout = info->layout;
6989 rv = mddev->pers->check_reshape(mddev);
6991 mddev->new_layout = mddev->layout;
6995 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6996 rv = update_size(mddev, (sector_t)info->size * 2);
6998 if (mddev->raid_disks != info->raid_disks)
6999 rv = update_raid_disks(mddev, info->raid_disks);
7001 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7002 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7006 if (mddev->recovery || mddev->sync_thread) {
7010 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7011 struct bitmap *bitmap;
7012 /* add the bitmap */
7013 if (mddev->bitmap) {
7017 if (mddev->bitmap_info.default_offset == 0) {
7021 mddev->bitmap_info.offset =
7022 mddev->bitmap_info.default_offset;
7023 mddev->bitmap_info.space =
7024 mddev->bitmap_info.default_space;
7025 bitmap = bitmap_create(mddev, -1);
7026 mddev_suspend(mddev);
7027 if (!IS_ERR(bitmap)) {
7028 mddev->bitmap = bitmap;
7029 rv = bitmap_load(mddev);
7031 rv = PTR_ERR(bitmap);
7033 bitmap_destroy(mddev);
7034 mddev_resume(mddev);
7036 /* remove the bitmap */
7037 if (!mddev->bitmap) {
7041 if (mddev->bitmap->storage.file) {
7045 if (mddev->bitmap_info.nodes) {
7046 /* hold PW on all the bitmap lock */
7047 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7048 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7050 md_cluster_ops->unlock_all_bitmaps(mddev);
7054 mddev->bitmap_info.nodes = 0;
7055 md_cluster_ops->leave(mddev);
7057 mddev_suspend(mddev);
7058 bitmap_destroy(mddev);
7059 mddev_resume(mddev);
7060 mddev->bitmap_info.offset = 0;
7063 md_update_sb(mddev, 1);
7069 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7071 struct md_rdev *rdev;
7074 if (mddev->pers == NULL)
7078 rdev = find_rdev_rcu(mddev, dev);
7082 md_error(mddev, rdev);
7083 if (!test_bit(Faulty, &rdev->flags))
7091 * We have a problem here : there is no easy way to give a CHS
7092 * virtual geometry. We currently pretend that we have a 2 heads
7093 * 4 sectors (with a BIG number of cylinders...). This drives
7094 * dosfs just mad... ;-)
7096 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7098 struct mddev *mddev = bdev->bd_disk->private_data;
7102 geo->cylinders = mddev->array_sectors / 8;
7106 static inline bool md_ioctl_valid(unsigned int cmd)
7111 case GET_ARRAY_INFO:
7112 case GET_BITMAP_FILE:
7115 case HOT_REMOVE_DISK:
7118 case RESTART_ARRAY_RW:
7120 case SET_ARRAY_INFO:
7121 case SET_BITMAP_FILE:
7122 case SET_DISK_FAULTY:
7125 case CLUSTERED_DISK_NACK:
7132 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7133 unsigned int cmd, unsigned long arg)
7136 void __user *argp = (void __user *)arg;
7137 struct mddev *mddev = NULL;
7139 bool did_set_md_closing = false;
7141 if (!md_ioctl_valid(cmd))
7146 case GET_ARRAY_INFO:
7150 if (!capable(CAP_SYS_ADMIN))
7155 * Commands dealing with the RAID driver but not any
7160 err = get_version(argp);
7166 autostart_arrays(arg);
7173 * Commands creating/starting a new array:
7176 mddev = bdev->bd_disk->private_data;
7183 /* Some actions do not requires the mutex */
7185 case GET_ARRAY_INFO:
7186 if (!mddev->raid_disks && !mddev->external)
7189 err = get_array_info(mddev, argp);
7193 if (!mddev->raid_disks && !mddev->external)
7196 err = get_disk_info(mddev, argp);
7199 case SET_DISK_FAULTY:
7200 err = set_disk_faulty(mddev, new_decode_dev(arg));
7203 case GET_BITMAP_FILE:
7204 err = get_bitmap_file(mddev, argp);
7209 if (cmd == ADD_NEW_DISK)
7210 /* need to ensure md_delayed_delete() has completed */
7211 flush_workqueue(md_misc_wq);
7213 if (cmd == HOT_REMOVE_DISK)
7214 /* need to ensure recovery thread has run */
7215 wait_event_interruptible_timeout(mddev->sb_wait,
7216 !test_bit(MD_RECOVERY_NEEDED,
7218 msecs_to_jiffies(5000));
7219 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7220 /* Need to flush page cache, and ensure no-one else opens
7223 mutex_lock(&mddev->open_mutex);
7224 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7225 mutex_unlock(&mddev->open_mutex);
7229 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7230 mutex_unlock(&mddev->open_mutex);
7234 did_set_md_closing = true;
7235 mutex_unlock(&mddev->open_mutex);
7236 sync_blockdev(bdev);
7238 err = mddev_lock(mddev);
7240 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7245 if (cmd == SET_ARRAY_INFO) {
7246 mdu_array_info_t info;
7248 memset(&info, 0, sizeof(info));
7249 else if (copy_from_user(&info, argp, sizeof(info))) {
7254 err = update_array_info(mddev, &info);
7256 pr_warn("md: couldn't update array info. %d\n", err);
7261 if (!list_empty(&mddev->disks)) {
7262 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7266 if (mddev->raid_disks) {
7267 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7271 err = set_array_info(mddev, &info);
7273 pr_warn("md: couldn't set array info. %d\n", err);
7280 * Commands querying/configuring an existing array:
7282 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7283 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7284 if ((!mddev->raid_disks && !mddev->external)
7285 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7286 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7287 && cmd != GET_BITMAP_FILE) {
7293 * Commands even a read-only array can execute:
7296 case RESTART_ARRAY_RW:
7297 err = restart_array(mddev);
7301 err = do_md_stop(mddev, 0, bdev);
7305 err = md_set_readonly(mddev, bdev);
7308 case HOT_REMOVE_DISK:
7309 err = hot_remove_disk(mddev, new_decode_dev(arg));
7313 /* We can support ADD_NEW_DISK on read-only arrays
7314 * only if we are re-adding a preexisting device.
7315 * So require mddev->pers and MD_DISK_SYNC.
7318 mdu_disk_info_t info;
7319 if (copy_from_user(&info, argp, sizeof(info)))
7321 else if (!(info.state & (1<<MD_DISK_SYNC)))
7322 /* Need to clear read-only for this */
7325 err = add_new_disk(mddev, &info);
7331 if (get_user(ro, (int __user *)(arg))) {
7337 /* if the bdev is going readonly the value of mddev->ro
7338 * does not matter, no writes are coming
7343 /* are we are already prepared for writes? */
7347 /* transitioning to readauto need only happen for
7348 * arrays that call md_write_start
7351 err = restart_array(mddev);
7354 set_disk_ro(mddev->gendisk, 0);
7361 * The remaining ioctls are changing the state of the
7362 * superblock, so we do not allow them on read-only arrays.
7364 if (mddev->ro && mddev->pers) {
7365 if (mddev->ro == 2) {
7367 sysfs_notify_dirent_safe(mddev->sysfs_state);
7368 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7369 /* mddev_unlock will wake thread */
7370 /* If a device failed while we were read-only, we
7371 * need to make sure the metadata is updated now.
7373 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7374 mddev_unlock(mddev);
7375 wait_event(mddev->sb_wait,
7376 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7377 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7378 mddev_lock_nointr(mddev);
7389 mdu_disk_info_t info;
7390 if (copy_from_user(&info, argp, sizeof(info)))
7393 err = add_new_disk(mddev, &info);
7397 case CLUSTERED_DISK_NACK:
7398 if (mddev_is_clustered(mddev))
7399 md_cluster_ops->new_disk_ack(mddev, false);
7405 err = hot_add_disk(mddev, new_decode_dev(arg));
7409 err = do_md_run(mddev);
7412 case SET_BITMAP_FILE:
7413 err = set_bitmap_file(mddev, (int)arg);
7422 if (mddev->hold_active == UNTIL_IOCTL &&
7424 mddev->hold_active = 0;
7425 mddev_unlock(mddev);
7427 if(did_set_md_closing)
7428 clear_bit(MD_CLOSING, &mddev->flags);
7431 #ifdef CONFIG_COMPAT
7432 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7433 unsigned int cmd, unsigned long arg)
7436 case HOT_REMOVE_DISK:
7438 case SET_DISK_FAULTY:
7439 case SET_BITMAP_FILE:
7440 /* These take in integer arg, do not convert */
7443 arg = (unsigned long)compat_ptr(arg);
7447 return md_ioctl(bdev, mode, cmd, arg);
7449 #endif /* CONFIG_COMPAT */
7451 static int md_open(struct block_device *bdev, fmode_t mode)
7454 * Succeed if we can lock the mddev, which confirms that
7455 * it isn't being stopped right now.
7457 struct mddev *mddev = mddev_find(bdev->bd_dev);
7463 if (mddev->gendisk != bdev->bd_disk) {
7464 /* we are racing with mddev_put which is discarding this
7468 /* Wait until bdev->bd_disk is definitely gone */
7469 if (work_pending(&mddev->del_work))
7470 flush_workqueue(md_misc_wq);
7473 BUG_ON(mddev != bdev->bd_disk->private_data);
7475 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7478 if (test_bit(MD_CLOSING, &mddev->flags)) {
7479 mutex_unlock(&mddev->open_mutex);
7485 atomic_inc(&mddev->openers);
7486 mutex_unlock(&mddev->open_mutex);
7488 check_disk_change(bdev);
7495 static void md_release(struct gendisk *disk, fmode_t mode)
7497 struct mddev *mddev = disk->private_data;
7500 atomic_dec(&mddev->openers);
7504 static int md_media_changed(struct gendisk *disk)
7506 struct mddev *mddev = disk->private_data;
7508 return mddev->changed;
7511 static int md_revalidate(struct gendisk *disk)
7513 struct mddev *mddev = disk->private_data;
7518 static const struct block_device_operations md_fops =
7520 .owner = THIS_MODULE,
7522 .release = md_release,
7524 #ifdef CONFIG_COMPAT
7525 .compat_ioctl = md_compat_ioctl,
7527 .getgeo = md_getgeo,
7528 .media_changed = md_media_changed,
7529 .revalidate_disk= md_revalidate,
7532 static int md_thread(void *arg)
7534 struct md_thread *thread = arg;
7537 * md_thread is a 'system-thread', it's priority should be very
7538 * high. We avoid resource deadlocks individually in each
7539 * raid personality. (RAID5 does preallocation) We also use RR and
7540 * the very same RT priority as kswapd, thus we will never get
7541 * into a priority inversion deadlock.
7543 * we definitely have to have equal or higher priority than
7544 * bdflush, otherwise bdflush will deadlock if there are too
7545 * many dirty RAID5 blocks.
7548 allow_signal(SIGKILL);
7549 while (!kthread_should_stop()) {
7551 /* We need to wait INTERRUPTIBLE so that
7552 * we don't add to the load-average.
7553 * That means we need to be sure no signals are
7556 if (signal_pending(current))
7557 flush_signals(current);
7559 wait_event_interruptible_timeout
7561 test_bit(THREAD_WAKEUP, &thread->flags)
7562 || kthread_should_stop() || kthread_should_park(),
7565 clear_bit(THREAD_WAKEUP, &thread->flags);
7566 if (kthread_should_park())
7568 if (!kthread_should_stop())
7569 thread->run(thread);
7575 void md_wakeup_thread(struct md_thread *thread)
7578 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7579 set_bit(THREAD_WAKEUP, &thread->flags);
7580 wake_up(&thread->wqueue);
7583 EXPORT_SYMBOL(md_wakeup_thread);
7585 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7586 struct mddev *mddev, const char *name)
7588 struct md_thread *thread;
7590 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7594 init_waitqueue_head(&thread->wqueue);
7597 thread->mddev = mddev;
7598 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7599 thread->tsk = kthread_run(md_thread, thread,
7601 mdname(thread->mddev),
7603 if (IS_ERR(thread->tsk)) {
7609 EXPORT_SYMBOL(md_register_thread);
7611 void md_unregister_thread(struct md_thread **threadp)
7613 struct md_thread *thread;
7616 * Locking ensures that mddev_unlock does not wake_up a
7617 * non-existent thread
7619 spin_lock(&pers_lock);
7622 spin_unlock(&pers_lock);
7626 spin_unlock(&pers_lock);
7628 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7629 kthread_stop(thread->tsk);
7632 EXPORT_SYMBOL(md_unregister_thread);
7634 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7636 if (!rdev || test_bit(Faulty, &rdev->flags))
7639 if (!mddev->pers || !mddev->pers->error_handler)
7641 mddev->pers->error_handler(mddev,rdev);
7642 if (mddev->degraded)
7643 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7644 sysfs_notify_dirent_safe(rdev->sysfs_state);
7645 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7646 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7647 md_wakeup_thread(mddev->thread);
7648 if (mddev->event_work.func)
7649 queue_work(md_misc_wq, &mddev->event_work);
7650 md_new_event(mddev);
7652 EXPORT_SYMBOL(md_error);
7654 /* seq_file implementation /proc/mdstat */
7656 static void status_unused(struct seq_file *seq)
7659 struct md_rdev *rdev;
7661 seq_printf(seq, "unused devices: ");
7663 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7664 char b[BDEVNAME_SIZE];
7666 seq_printf(seq, "%s ",
7667 bdevname(rdev->bdev,b));
7670 seq_printf(seq, "<none>");
7672 seq_printf(seq, "\n");
7675 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7677 sector_t max_sectors, resync, res;
7678 unsigned long dt, db = 0;
7679 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7680 int scale, recovery_active;
7681 unsigned int per_milli;
7683 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7684 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7685 max_sectors = mddev->resync_max_sectors;
7687 max_sectors = mddev->dev_sectors;
7689 resync = mddev->curr_resync;
7691 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7692 /* Still cleaning up */
7693 resync = max_sectors;
7695 resync -= atomic_read(&mddev->recovery_active);
7698 if (mddev->recovery_cp < MaxSector) {
7699 seq_printf(seq, "\tresync=PENDING");
7705 seq_printf(seq, "\tresync=DELAYED");
7709 WARN_ON(max_sectors == 0);
7710 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7711 * in a sector_t, and (max_sectors>>scale) will fit in a
7712 * u32, as those are the requirements for sector_div.
7713 * Thus 'scale' must be at least 10
7716 if (sizeof(sector_t) > sizeof(unsigned long)) {
7717 while ( max_sectors/2 > (1ULL<<(scale+32)))
7720 res = (resync>>scale)*1000;
7721 sector_div(res, (u32)((max_sectors>>scale)+1));
7725 int i, x = per_milli/50, y = 20-x;
7726 seq_printf(seq, "[");
7727 for (i = 0; i < x; i++)
7728 seq_printf(seq, "=");
7729 seq_printf(seq, ">");
7730 for (i = 0; i < y; i++)
7731 seq_printf(seq, ".");
7732 seq_printf(seq, "] ");
7734 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7735 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7737 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7739 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7740 "resync" : "recovery"))),
7741 per_milli/10, per_milli % 10,
7742 (unsigned long long) resync/2,
7743 (unsigned long long) max_sectors/2);
7746 * dt: time from mark until now
7747 * db: blocks written from mark until now
7748 * rt: remaining time
7750 * rt is a sector_t, which is always 64bit now. We are keeping
7751 * the original algorithm, but it is not really necessary.
7753 * Original algorithm:
7754 * So we divide before multiply in case it is 32bit and close
7756 * We scale the divisor (db) by 32 to avoid losing precision
7757 * near the end of resync when the number of remaining sectors
7759 * We then divide rt by 32 after multiplying by db to compensate.
7760 * The '+1' avoids division by zero if db is very small.
7762 dt = ((jiffies - mddev->resync_mark) / HZ);
7765 curr_mark_cnt = mddev->curr_mark_cnt;
7766 recovery_active = atomic_read(&mddev->recovery_active);
7767 resync_mark_cnt = mddev->resync_mark_cnt;
7769 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7770 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7772 rt = max_sectors - resync; /* number of remaining sectors */
7773 rt = div64_u64(rt, db/32+1);
7777 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7778 ((unsigned long)rt % 60)/6);
7780 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7784 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7786 struct list_head *tmp;
7788 struct mddev *mddev;
7796 spin_lock(&all_mddevs_lock);
7797 list_for_each(tmp,&all_mddevs)
7799 mddev = list_entry(tmp, struct mddev, all_mddevs);
7801 spin_unlock(&all_mddevs_lock);
7804 spin_unlock(&all_mddevs_lock);
7806 return (void*)2;/* tail */
7810 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7812 struct list_head *tmp;
7813 struct mddev *next_mddev, *mddev = v;
7819 spin_lock(&all_mddevs_lock);
7821 tmp = all_mddevs.next;
7823 tmp = mddev->all_mddevs.next;
7824 if (tmp != &all_mddevs)
7825 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7827 next_mddev = (void*)2;
7830 spin_unlock(&all_mddevs_lock);
7838 static void md_seq_stop(struct seq_file *seq, void *v)
7840 struct mddev *mddev = v;
7842 if (mddev && v != (void*)1 && v != (void*)2)
7846 static int md_seq_show(struct seq_file *seq, void *v)
7848 struct mddev *mddev = v;
7850 struct md_rdev *rdev;
7852 if (v == (void*)1) {
7853 struct md_personality *pers;
7854 seq_printf(seq, "Personalities : ");
7855 spin_lock(&pers_lock);
7856 list_for_each_entry(pers, &pers_list, list)
7857 seq_printf(seq, "[%s] ", pers->name);
7859 spin_unlock(&pers_lock);
7860 seq_printf(seq, "\n");
7861 seq->poll_event = atomic_read(&md_event_count);
7864 if (v == (void*)2) {
7869 spin_lock(&mddev->lock);
7870 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7871 seq_printf(seq, "%s : %sactive", mdname(mddev),
7872 mddev->pers ? "" : "in");
7875 seq_printf(seq, " (read-only)");
7877 seq_printf(seq, " (auto-read-only)");
7878 seq_printf(seq, " %s", mddev->pers->name);
7883 rdev_for_each_rcu(rdev, mddev) {
7884 char b[BDEVNAME_SIZE];
7885 seq_printf(seq, " %s[%d]",
7886 bdevname(rdev->bdev,b), rdev->desc_nr);
7887 if (test_bit(WriteMostly, &rdev->flags))
7888 seq_printf(seq, "(W)");
7889 if (test_bit(Journal, &rdev->flags))
7890 seq_printf(seq, "(J)");
7891 if (test_bit(Faulty, &rdev->flags)) {
7892 seq_printf(seq, "(F)");
7895 if (rdev->raid_disk < 0)
7896 seq_printf(seq, "(S)"); /* spare */
7897 if (test_bit(Replacement, &rdev->flags))
7898 seq_printf(seq, "(R)");
7899 sectors += rdev->sectors;
7903 if (!list_empty(&mddev->disks)) {
7905 seq_printf(seq, "\n %llu blocks",
7906 (unsigned long long)
7907 mddev->array_sectors / 2);
7909 seq_printf(seq, "\n %llu blocks",
7910 (unsigned long long)sectors / 2);
7912 if (mddev->persistent) {
7913 if (mddev->major_version != 0 ||
7914 mddev->minor_version != 90) {
7915 seq_printf(seq," super %d.%d",
7916 mddev->major_version,
7917 mddev->minor_version);
7919 } else if (mddev->external)
7920 seq_printf(seq, " super external:%s",
7921 mddev->metadata_type);
7923 seq_printf(seq, " super non-persistent");
7926 mddev->pers->status(seq, mddev);
7927 seq_printf(seq, "\n ");
7928 if (mddev->pers->sync_request) {
7929 if (status_resync(seq, mddev))
7930 seq_printf(seq, "\n ");
7933 seq_printf(seq, "\n ");
7935 bitmap_status(seq, mddev->bitmap);
7937 seq_printf(seq, "\n");
7939 spin_unlock(&mddev->lock);
7944 static const struct seq_operations md_seq_ops = {
7945 .start = md_seq_start,
7946 .next = md_seq_next,
7947 .stop = md_seq_stop,
7948 .show = md_seq_show,
7951 static int md_seq_open(struct inode *inode, struct file *file)
7953 struct seq_file *seq;
7956 error = seq_open(file, &md_seq_ops);
7960 seq = file->private_data;
7961 seq->poll_event = atomic_read(&md_event_count);
7965 static int md_unloading;
7966 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7968 struct seq_file *seq = filp->private_data;
7972 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7973 poll_wait(filp, &md_event_waiters, wait);
7975 /* always allow read */
7976 mask = POLLIN | POLLRDNORM;
7978 if (seq->poll_event != atomic_read(&md_event_count))
7979 mask |= POLLERR | POLLPRI;
7983 static const struct file_operations md_seq_fops = {
7984 .owner = THIS_MODULE,
7985 .open = md_seq_open,
7987 .llseek = seq_lseek,
7988 .release = seq_release,
7989 .poll = mdstat_poll,
7992 int register_md_personality(struct md_personality *p)
7994 pr_debug("md: %s personality registered for level %d\n",
7996 spin_lock(&pers_lock);
7997 list_add_tail(&p->list, &pers_list);
7998 spin_unlock(&pers_lock);
8001 EXPORT_SYMBOL(register_md_personality);
8003 int unregister_md_personality(struct md_personality *p)
8005 pr_debug("md: %s personality unregistered\n", p->name);
8006 spin_lock(&pers_lock);
8007 list_del_init(&p->list);
8008 spin_unlock(&pers_lock);
8011 EXPORT_SYMBOL(unregister_md_personality);
8013 int register_md_cluster_operations(struct md_cluster_operations *ops,
8014 struct module *module)
8017 spin_lock(&pers_lock);
8018 if (md_cluster_ops != NULL)
8021 md_cluster_ops = ops;
8022 md_cluster_mod = module;
8024 spin_unlock(&pers_lock);
8027 EXPORT_SYMBOL(register_md_cluster_operations);
8029 int unregister_md_cluster_operations(void)
8031 spin_lock(&pers_lock);
8032 md_cluster_ops = NULL;
8033 spin_unlock(&pers_lock);
8036 EXPORT_SYMBOL(unregister_md_cluster_operations);
8038 int md_setup_cluster(struct mddev *mddev, int nodes)
8040 if (!md_cluster_ops)
8041 request_module("md-cluster");
8042 spin_lock(&pers_lock);
8043 /* ensure module won't be unloaded */
8044 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8045 pr_warn("can't find md-cluster module or get it's reference.\n");
8046 spin_unlock(&pers_lock);
8049 spin_unlock(&pers_lock);
8051 return md_cluster_ops->join(mddev, nodes);
8054 void md_cluster_stop(struct mddev *mddev)
8056 if (!md_cluster_ops)
8058 md_cluster_ops->leave(mddev);
8059 module_put(md_cluster_mod);
8062 static int is_mddev_idle(struct mddev *mddev, int init)
8064 struct md_rdev *rdev;
8070 rdev_for_each_rcu(rdev, mddev) {
8071 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8072 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
8073 (int)part_stat_read(&disk->part0, sectors[1]) -
8074 atomic_read(&disk->sync_io);
8075 /* sync IO will cause sync_io to increase before the disk_stats
8076 * as sync_io is counted when a request starts, and
8077 * disk_stats is counted when it completes.
8078 * So resync activity will cause curr_events to be smaller than
8079 * when there was no such activity.
8080 * non-sync IO will cause disk_stat to increase without
8081 * increasing sync_io so curr_events will (eventually)
8082 * be larger than it was before. Once it becomes
8083 * substantially larger, the test below will cause
8084 * the array to appear non-idle, and resync will slow
8086 * If there is a lot of outstanding resync activity when
8087 * we set last_event to curr_events, then all that activity
8088 * completing might cause the array to appear non-idle
8089 * and resync will be slowed down even though there might
8090 * not have been non-resync activity. This will only
8091 * happen once though. 'last_events' will soon reflect
8092 * the state where there is little or no outstanding
8093 * resync requests, and further resync activity will
8094 * always make curr_events less than last_events.
8097 if (init || curr_events - rdev->last_events > 64) {
8098 rdev->last_events = curr_events;
8106 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8108 /* another "blocks" (512byte) blocks have been synced */
8109 atomic_sub(blocks, &mddev->recovery_active);
8110 wake_up(&mddev->recovery_wait);
8112 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8113 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8114 md_wakeup_thread(mddev->thread);
8115 // stop recovery, signal do_sync ....
8118 EXPORT_SYMBOL(md_done_sync);
8120 /* md_write_start(mddev, bi)
8121 * If we need to update some array metadata (e.g. 'active' flag
8122 * in superblock) before writing, schedule a superblock update
8123 * and wait for it to complete.
8124 * A return value of 'false' means that the write wasn't recorded
8125 * and cannot proceed as the array is being suspend.
8127 bool md_write_start(struct mddev *mddev, struct bio *bi)
8131 if (bio_data_dir(bi) != WRITE)
8134 BUG_ON(mddev->ro == 1);
8135 if (mddev->ro == 2) {
8136 /* need to switch to read/write */
8138 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8139 md_wakeup_thread(mddev->thread);
8140 md_wakeup_thread(mddev->sync_thread);
8144 percpu_ref_get(&mddev->writes_pending);
8145 smp_mb(); /* Match smp_mb in set_in_sync() */
8146 if (mddev->safemode == 1)
8147 mddev->safemode = 0;
8148 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8149 if (mddev->in_sync || mddev->sync_checkers) {
8150 spin_lock(&mddev->lock);
8151 if (mddev->in_sync) {
8153 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8154 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8155 md_wakeup_thread(mddev->thread);
8158 spin_unlock(&mddev->lock);
8162 sysfs_notify_dirent_safe(mddev->sysfs_state);
8163 if (!mddev->has_superblocks)
8165 wait_event(mddev->sb_wait,
8166 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8168 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8169 percpu_ref_put(&mddev->writes_pending);
8174 EXPORT_SYMBOL(md_write_start);
8176 /* md_write_inc can only be called when md_write_start() has
8177 * already been called at least once of the current request.
8178 * It increments the counter and is useful when a single request
8179 * is split into several parts. Each part causes an increment and
8180 * so needs a matching md_write_end().
8181 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8182 * a spinlocked region.
8184 void md_write_inc(struct mddev *mddev, struct bio *bi)
8186 if (bio_data_dir(bi) != WRITE)
8188 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8189 percpu_ref_get(&mddev->writes_pending);
8191 EXPORT_SYMBOL(md_write_inc);
8193 void md_write_end(struct mddev *mddev)
8195 percpu_ref_put(&mddev->writes_pending);
8197 if (mddev->safemode == 2)
8198 md_wakeup_thread(mddev->thread);
8199 else if (mddev->safemode_delay)
8200 /* The roundup() ensures this only performs locking once
8201 * every ->safemode_delay jiffies
8203 mod_timer(&mddev->safemode_timer,
8204 roundup(jiffies, mddev->safemode_delay) +
8205 mddev->safemode_delay);
8208 EXPORT_SYMBOL(md_write_end);
8210 /* md_allow_write(mddev)
8211 * Calling this ensures that the array is marked 'active' so that writes
8212 * may proceed without blocking. It is important to call this before
8213 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8214 * Must be called with mddev_lock held.
8216 void md_allow_write(struct mddev *mddev)
8222 if (!mddev->pers->sync_request)
8225 spin_lock(&mddev->lock);
8226 if (mddev->in_sync) {
8228 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8229 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8230 if (mddev->safemode_delay &&
8231 mddev->safemode == 0)
8232 mddev->safemode = 1;
8233 spin_unlock(&mddev->lock);
8234 md_update_sb(mddev, 0);
8235 sysfs_notify_dirent_safe(mddev->sysfs_state);
8236 /* wait for the dirty state to be recorded in the metadata */
8237 wait_event(mddev->sb_wait,
8238 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8240 spin_unlock(&mddev->lock);
8242 EXPORT_SYMBOL_GPL(md_allow_write);
8244 #define SYNC_MARKS 10
8245 #define SYNC_MARK_STEP (3*HZ)
8246 #define UPDATE_FREQUENCY (5*60*HZ)
8247 void md_do_sync(struct md_thread *thread)
8249 struct mddev *mddev = thread->mddev;
8250 struct mddev *mddev2;
8251 unsigned int currspeed = 0,
8253 sector_t max_sectors,j, io_sectors, recovery_done;
8254 unsigned long mark[SYNC_MARKS];
8255 unsigned long update_time;
8256 sector_t mark_cnt[SYNC_MARKS];
8258 struct list_head *tmp;
8259 sector_t last_check;
8261 struct md_rdev *rdev;
8262 char *desc, *action = NULL;
8263 struct blk_plug plug;
8266 /* just incase thread restarts... */
8267 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8269 if (mddev->ro) {/* never try to sync a read-only array */
8270 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8274 if (mddev_is_clustered(mddev)) {
8275 ret = md_cluster_ops->resync_start(mddev);
8279 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8280 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8281 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8282 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8283 && ((unsigned long long)mddev->curr_resync_completed
8284 < (unsigned long long)mddev->resync_max_sectors))
8288 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8289 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8290 desc = "data-check";
8292 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8293 desc = "requested-resync";
8297 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8302 mddev->last_sync_action = action ?: desc;
8304 /* we overload curr_resync somewhat here.
8305 * 0 == not engaged in resync at all
8306 * 2 == checking that there is no conflict with another sync
8307 * 1 == like 2, but have yielded to allow conflicting resync to
8309 * other == active in resync - this many blocks
8311 * Before starting a resync we must have set curr_resync to
8312 * 2, and then checked that every "conflicting" array has curr_resync
8313 * less than ours. When we find one that is the same or higher
8314 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8315 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8316 * This will mean we have to start checking from the beginning again.
8321 int mddev2_minor = -1;
8322 mddev->curr_resync = 2;
8325 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8327 for_each_mddev(mddev2, tmp) {
8328 if (mddev2 == mddev)
8330 if (!mddev->parallel_resync
8331 && mddev2->curr_resync
8332 && match_mddev_units(mddev, mddev2)) {
8334 if (mddev < mddev2 && mddev->curr_resync == 2) {
8335 /* arbitrarily yield */
8336 mddev->curr_resync = 1;
8337 wake_up(&resync_wait);
8339 if (mddev > mddev2 && mddev->curr_resync == 1)
8340 /* no need to wait here, we can wait the next
8341 * time 'round when curr_resync == 2
8344 /* We need to wait 'interruptible' so as not to
8345 * contribute to the load average, and not to
8346 * be caught by 'softlockup'
8348 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8349 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8350 mddev2->curr_resync >= mddev->curr_resync) {
8351 if (mddev2_minor != mddev2->md_minor) {
8352 mddev2_minor = mddev2->md_minor;
8353 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8354 desc, mdname(mddev),
8358 if (signal_pending(current))
8359 flush_signals(current);
8361 finish_wait(&resync_wait, &wq);
8364 finish_wait(&resync_wait, &wq);
8367 } while (mddev->curr_resync < 2);
8370 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8371 /* resync follows the size requested by the personality,
8372 * which defaults to physical size, but can be virtual size
8374 max_sectors = mddev->resync_max_sectors;
8375 atomic64_set(&mddev->resync_mismatches, 0);
8376 /* we don't use the checkpoint if there's a bitmap */
8377 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8378 j = mddev->resync_min;
8379 else if (!mddev->bitmap)
8380 j = mddev->recovery_cp;
8382 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8383 max_sectors = mddev->resync_max_sectors;
8385 /* recovery follows the physical size of devices */
8386 max_sectors = mddev->dev_sectors;
8389 rdev_for_each_rcu(rdev, mddev)
8390 if (rdev->raid_disk >= 0 &&
8391 !test_bit(Journal, &rdev->flags) &&
8392 !test_bit(Faulty, &rdev->flags) &&
8393 !test_bit(In_sync, &rdev->flags) &&
8394 rdev->recovery_offset < j)
8395 j = rdev->recovery_offset;
8398 /* If there is a bitmap, we need to make sure all
8399 * writes that started before we added a spare
8400 * complete before we start doing a recovery.
8401 * Otherwise the write might complete and (via
8402 * bitmap_endwrite) set a bit in the bitmap after the
8403 * recovery has checked that bit and skipped that
8406 if (mddev->bitmap) {
8407 mddev->pers->quiesce(mddev, 1);
8408 mddev->pers->quiesce(mddev, 0);
8412 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8413 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8414 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8415 speed_max(mddev), desc);
8417 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8420 for (m = 0; m < SYNC_MARKS; m++) {
8422 mark_cnt[m] = io_sectors;
8425 mddev->resync_mark = mark[last_mark];
8426 mddev->resync_mark_cnt = mark_cnt[last_mark];
8429 * Tune reconstruction:
8431 window = 32*(PAGE_SIZE/512);
8432 pr_debug("md: using %dk window, over a total of %lluk.\n",
8433 window/2, (unsigned long long)max_sectors/2);
8435 atomic_set(&mddev->recovery_active, 0);
8439 pr_debug("md: resuming %s of %s from checkpoint.\n",
8440 desc, mdname(mddev));
8441 mddev->curr_resync = j;
8443 mddev->curr_resync = 3; /* no longer delayed */
8444 mddev->curr_resync_completed = j;
8445 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8446 md_new_event(mddev);
8447 update_time = jiffies;
8449 blk_start_plug(&plug);
8450 while (j < max_sectors) {
8455 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8456 ((mddev->curr_resync > mddev->curr_resync_completed &&
8457 (mddev->curr_resync - mddev->curr_resync_completed)
8458 > (max_sectors >> 4)) ||
8459 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8460 (j - mddev->curr_resync_completed)*2
8461 >= mddev->resync_max - mddev->curr_resync_completed ||
8462 mddev->curr_resync_completed > mddev->resync_max
8464 /* time to update curr_resync_completed */
8465 wait_event(mddev->recovery_wait,
8466 atomic_read(&mddev->recovery_active) == 0);
8467 mddev->curr_resync_completed = j;
8468 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8469 j > mddev->recovery_cp)
8470 mddev->recovery_cp = j;
8471 update_time = jiffies;
8472 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8473 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8476 while (j >= mddev->resync_max &&
8477 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8478 /* As this condition is controlled by user-space,
8479 * we can block indefinitely, so use '_interruptible'
8480 * to avoid triggering warnings.
8482 flush_signals(current); /* just in case */
8483 wait_event_interruptible(mddev->recovery_wait,
8484 mddev->resync_max > j
8485 || test_bit(MD_RECOVERY_INTR,
8489 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8492 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8494 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8498 if (!skipped) { /* actual IO requested */
8499 io_sectors += sectors;
8500 atomic_add(sectors, &mddev->recovery_active);
8503 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8507 if (j > max_sectors)
8508 /* when skipping, extra large numbers can be returned. */
8511 mddev->curr_resync = j;
8512 mddev->curr_mark_cnt = io_sectors;
8513 if (last_check == 0)
8514 /* this is the earliest that rebuild will be
8515 * visible in /proc/mdstat
8517 md_new_event(mddev);
8519 if (last_check + window > io_sectors || j == max_sectors)
8522 last_check = io_sectors;
8524 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8526 int next = (last_mark+1) % SYNC_MARKS;
8528 mddev->resync_mark = mark[next];
8529 mddev->resync_mark_cnt = mark_cnt[next];
8530 mark[next] = jiffies;
8531 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8535 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8539 * this loop exits only if either when we are slower than
8540 * the 'hard' speed limit, or the system was IO-idle for
8542 * the system might be non-idle CPU-wise, but we only care
8543 * about not overloading the IO subsystem. (things like an
8544 * e2fsck being done on the RAID array should execute fast)
8548 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8549 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8550 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8552 if (currspeed > speed_min(mddev)) {
8553 if (currspeed > speed_max(mddev)) {
8557 if (!is_mddev_idle(mddev, 0)) {
8559 * Give other IO more of a chance.
8560 * The faster the devices, the less we wait.
8562 wait_event(mddev->recovery_wait,
8563 !atomic_read(&mddev->recovery_active));
8567 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8568 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8569 ? "interrupted" : "done");
8571 * this also signals 'finished resyncing' to md_stop
8573 blk_finish_plug(&plug);
8574 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8576 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8577 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8578 mddev->curr_resync > 3) {
8579 mddev->curr_resync_completed = mddev->curr_resync;
8580 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8582 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8584 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8585 mddev->curr_resync > 3) {
8586 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8587 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8588 if (mddev->curr_resync >= mddev->recovery_cp) {
8589 pr_debug("md: checkpointing %s of %s.\n",
8590 desc, mdname(mddev));
8591 if (test_bit(MD_RECOVERY_ERROR,
8593 mddev->recovery_cp =
8594 mddev->curr_resync_completed;
8596 mddev->recovery_cp =
8600 mddev->recovery_cp = MaxSector;
8602 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8603 mddev->curr_resync = MaxSector;
8605 rdev_for_each_rcu(rdev, mddev)
8606 if (rdev->raid_disk >= 0 &&
8607 mddev->delta_disks >= 0 &&
8608 !test_bit(Journal, &rdev->flags) &&
8609 !test_bit(Faulty, &rdev->flags) &&
8610 !test_bit(In_sync, &rdev->flags) &&
8611 rdev->recovery_offset < mddev->curr_resync)
8612 rdev->recovery_offset = mddev->curr_resync;
8617 /* set CHANGE_PENDING here since maybe another update is needed,
8618 * so other nodes are informed. It should be harmless for normal
8620 set_mask_bits(&mddev->sb_flags, 0,
8621 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8623 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8624 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8625 mddev->delta_disks > 0 &&
8626 mddev->pers->finish_reshape &&
8627 mddev->pers->size &&
8629 mddev_lock_nointr(mddev);
8630 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8631 mddev_unlock(mddev);
8632 set_capacity(mddev->gendisk, mddev->array_sectors);
8633 revalidate_disk(mddev->gendisk);
8636 spin_lock(&mddev->lock);
8637 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8638 /* We completed so min/max setting can be forgotten if used. */
8639 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8640 mddev->resync_min = 0;
8641 mddev->resync_max = MaxSector;
8642 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8643 mddev->resync_min = mddev->curr_resync_completed;
8644 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8645 mddev->curr_resync = 0;
8646 spin_unlock(&mddev->lock);
8648 wake_up(&resync_wait);
8649 md_wakeup_thread(mddev->thread);
8652 EXPORT_SYMBOL_GPL(md_do_sync);
8654 static int remove_and_add_spares(struct mddev *mddev,
8655 struct md_rdev *this)
8657 struct md_rdev *rdev;
8660 bool remove_some = false;
8662 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8663 /* Mustn't remove devices when resync thread is running */
8666 rdev_for_each(rdev, mddev) {
8667 if ((this == NULL || rdev == this) &&
8668 rdev->raid_disk >= 0 &&
8669 !test_bit(Blocked, &rdev->flags) &&
8670 test_bit(Faulty, &rdev->flags) &&
8671 atomic_read(&rdev->nr_pending)==0) {
8672 /* Faulty non-Blocked devices with nr_pending == 0
8673 * never get nr_pending incremented,
8674 * never get Faulty cleared, and never get Blocked set.
8675 * So we can synchronize_rcu now rather than once per device
8678 set_bit(RemoveSynchronized, &rdev->flags);
8684 rdev_for_each(rdev, mddev) {
8685 if ((this == NULL || rdev == this) &&
8686 rdev->raid_disk >= 0 &&
8687 !test_bit(Blocked, &rdev->flags) &&
8688 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8689 (!test_bit(In_sync, &rdev->flags) &&
8690 !test_bit(Journal, &rdev->flags))) &&
8691 atomic_read(&rdev->nr_pending)==0)) {
8692 if (mddev->pers->hot_remove_disk(
8693 mddev, rdev) == 0) {
8694 sysfs_unlink_rdev(mddev, rdev);
8695 rdev->saved_raid_disk = rdev->raid_disk;
8696 rdev->raid_disk = -1;
8700 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8701 clear_bit(RemoveSynchronized, &rdev->flags);
8704 if (removed && mddev->kobj.sd)
8705 sysfs_notify(&mddev->kobj, NULL, "degraded");
8707 if (this && removed)
8710 rdev_for_each(rdev, mddev) {
8711 if (this && this != rdev)
8713 if (test_bit(Candidate, &rdev->flags))
8715 if (rdev->raid_disk >= 0 &&
8716 !test_bit(In_sync, &rdev->flags) &&
8717 !test_bit(Journal, &rdev->flags) &&
8718 !test_bit(Faulty, &rdev->flags))
8720 if (rdev->raid_disk >= 0)
8722 if (test_bit(Faulty, &rdev->flags))
8724 if (!test_bit(Journal, &rdev->flags)) {
8726 ! (rdev->saved_raid_disk >= 0 &&
8727 !test_bit(Bitmap_sync, &rdev->flags)))
8730 rdev->recovery_offset = 0;
8733 hot_add_disk(mddev, rdev) == 0) {
8734 if (sysfs_link_rdev(mddev, rdev))
8735 /* failure here is OK */;
8736 if (!test_bit(Journal, &rdev->flags))
8738 md_new_event(mddev);
8739 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8744 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8748 static void md_start_sync(struct work_struct *ws)
8750 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8752 mddev->sync_thread = md_register_thread(md_do_sync,
8755 if (!mddev->sync_thread) {
8756 pr_warn("%s: could not start resync thread...\n",
8758 /* leave the spares where they are, it shouldn't hurt */
8759 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8760 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8761 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8762 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8763 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8764 wake_up(&resync_wait);
8765 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8767 if (mddev->sysfs_action)
8768 sysfs_notify_dirent_safe(mddev->sysfs_action);
8770 md_wakeup_thread(mddev->sync_thread);
8771 sysfs_notify_dirent_safe(mddev->sysfs_action);
8772 md_new_event(mddev);
8776 * This routine is regularly called by all per-raid-array threads to
8777 * deal with generic issues like resync and super-block update.
8778 * Raid personalities that don't have a thread (linear/raid0) do not
8779 * need this as they never do any recovery or update the superblock.
8781 * It does not do any resync itself, but rather "forks" off other threads
8782 * to do that as needed.
8783 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8784 * "->recovery" and create a thread at ->sync_thread.
8785 * When the thread finishes it sets MD_RECOVERY_DONE
8786 * and wakeups up this thread which will reap the thread and finish up.
8787 * This thread also removes any faulty devices (with nr_pending == 0).
8789 * The overall approach is:
8790 * 1/ if the superblock needs updating, update it.
8791 * 2/ If a recovery thread is running, don't do anything else.
8792 * 3/ If recovery has finished, clean up, possibly marking spares active.
8793 * 4/ If there are any faulty devices, remove them.
8794 * 5/ If array is degraded, try to add spares devices
8795 * 6/ If array has spares or is not in-sync, start a resync thread.
8797 void md_check_recovery(struct mddev *mddev)
8799 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8800 /* Write superblock - thread that called mddev_suspend()
8801 * holds reconfig_mutex for us.
8803 set_bit(MD_UPDATING_SB, &mddev->flags);
8804 smp_mb__after_atomic();
8805 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8806 md_update_sb(mddev, 0);
8807 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8808 wake_up(&mddev->sb_wait);
8811 if (mddev->suspended)
8815 bitmap_daemon_work(mddev);
8817 if (signal_pending(current)) {
8818 if (mddev->pers->sync_request && !mddev->external) {
8819 pr_debug("md: %s in immediate safe mode\n",
8821 mddev->safemode = 2;
8823 flush_signals(current);
8826 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8829 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8830 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8831 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8832 (mddev->external == 0 && mddev->safemode == 1) ||
8833 (mddev->safemode == 2
8834 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8838 if (mddev_trylock(mddev)) {
8840 bool try_set_sync = mddev->safemode != 0;
8842 if (!mddev->external && mddev->safemode == 1)
8843 mddev->safemode = 0;
8846 struct md_rdev *rdev;
8847 if (!mddev->external && mddev->in_sync)
8848 /* 'Blocked' flag not needed as failed devices
8849 * will be recorded if array switched to read/write.
8850 * Leaving it set will prevent the device
8851 * from being removed.
8853 rdev_for_each(rdev, mddev)
8854 clear_bit(Blocked, &rdev->flags);
8855 /* On a read-only array we can:
8856 * - remove failed devices
8857 * - add already-in_sync devices if the array itself
8859 * As we only add devices that are already in-sync,
8860 * we can activate the spares immediately.
8862 remove_and_add_spares(mddev, NULL);
8863 /* There is no thread, but we need to call
8864 * ->spare_active and clear saved_raid_disk
8866 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8867 md_reap_sync_thread(mddev);
8868 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8869 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8870 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8874 if (mddev_is_clustered(mddev)) {
8875 struct md_rdev *rdev, *tmp;
8876 /* kick the device if another node issued a
8879 rdev_for_each_safe(rdev, tmp, mddev) {
8880 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8881 rdev->raid_disk < 0)
8882 md_kick_rdev_from_array(rdev);
8886 if (try_set_sync && !mddev->external && !mddev->in_sync) {
8887 spin_lock(&mddev->lock);
8889 spin_unlock(&mddev->lock);
8892 if (mddev->sb_flags)
8893 md_update_sb(mddev, 0);
8895 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8896 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8897 /* resync/recovery still happening */
8898 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8901 if (mddev->sync_thread) {
8902 md_reap_sync_thread(mddev);
8905 /* Set RUNNING before clearing NEEDED to avoid
8906 * any transients in the value of "sync_action".
8908 mddev->curr_resync_completed = 0;
8909 spin_lock(&mddev->lock);
8910 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8911 spin_unlock(&mddev->lock);
8912 /* Clear some bits that don't mean anything, but
8915 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8916 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8918 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8919 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8921 /* no recovery is running.
8922 * remove any failed drives, then
8923 * add spares if possible.
8924 * Spares are also removed and re-added, to allow
8925 * the personality to fail the re-add.
8928 if (mddev->reshape_position != MaxSector) {
8929 if (mddev->pers->check_reshape == NULL ||
8930 mddev->pers->check_reshape(mddev) != 0)
8931 /* Cannot proceed */
8933 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8934 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8935 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8936 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8937 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8938 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8939 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8940 } else if (mddev->recovery_cp < MaxSector) {
8941 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8942 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8943 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8944 /* nothing to be done ... */
8947 if (mddev->pers->sync_request) {
8949 /* We are adding a device or devices to an array
8950 * which has the bitmap stored on all devices.
8951 * So make sure all bitmap pages get written
8953 bitmap_write_all(mddev->bitmap);
8955 INIT_WORK(&mddev->del_work, md_start_sync);
8956 queue_work(md_misc_wq, &mddev->del_work);
8960 if (!mddev->sync_thread) {
8961 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8962 wake_up(&resync_wait);
8963 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8965 if (mddev->sysfs_action)
8966 sysfs_notify_dirent_safe(mddev->sysfs_action);
8969 wake_up(&mddev->sb_wait);
8970 mddev_unlock(mddev);
8973 EXPORT_SYMBOL(md_check_recovery);
8975 void md_reap_sync_thread(struct mddev *mddev)
8977 struct md_rdev *rdev;
8979 /* resync has finished, collect result */
8980 md_unregister_thread(&mddev->sync_thread);
8981 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8982 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
8983 mddev->degraded != mddev->raid_disks) {
8985 /* activate any spares */
8986 if (mddev->pers->spare_active(mddev)) {
8987 sysfs_notify(&mddev->kobj, NULL,
8989 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8992 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8993 mddev->pers->finish_reshape)
8994 mddev->pers->finish_reshape(mddev);
8996 /* If array is no-longer degraded, then any saved_raid_disk
8997 * information must be scrapped.
8999 if (!mddev->degraded)
9000 rdev_for_each(rdev, mddev)
9001 rdev->saved_raid_disk = -1;
9003 md_update_sb(mddev, 1);
9004 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9005 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9007 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9008 md_cluster_ops->resync_finish(mddev);
9009 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9010 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9011 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9012 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9013 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9014 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9015 wake_up(&resync_wait);
9016 /* flag recovery needed just to double check */
9017 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9018 sysfs_notify_dirent_safe(mddev->sysfs_action);
9019 md_new_event(mddev);
9020 if (mddev->event_work.func)
9021 queue_work(md_misc_wq, &mddev->event_work);
9023 EXPORT_SYMBOL(md_reap_sync_thread);
9025 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9027 sysfs_notify_dirent_safe(rdev->sysfs_state);
9028 wait_event_timeout(rdev->blocked_wait,
9029 !test_bit(Blocked, &rdev->flags) &&
9030 !test_bit(BlockedBadBlocks, &rdev->flags),
9031 msecs_to_jiffies(5000));
9032 rdev_dec_pending(rdev, mddev);
9034 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9036 void md_finish_reshape(struct mddev *mddev)
9038 /* called be personality module when reshape completes. */
9039 struct md_rdev *rdev;
9041 rdev_for_each(rdev, mddev) {
9042 if (rdev->data_offset > rdev->new_data_offset)
9043 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9045 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9046 rdev->data_offset = rdev->new_data_offset;
9049 EXPORT_SYMBOL(md_finish_reshape);
9051 /* Bad block management */
9053 /* Returns 1 on success, 0 on failure */
9054 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9057 struct mddev *mddev = rdev->mddev;
9060 s += rdev->new_data_offset;
9062 s += rdev->data_offset;
9063 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9065 /* Make sure they get written out promptly */
9066 if (test_bit(ExternalBbl, &rdev->flags))
9067 sysfs_notify(&rdev->kobj, NULL,
9068 "unacknowledged_bad_blocks");
9069 sysfs_notify_dirent_safe(rdev->sysfs_state);
9070 set_mask_bits(&mddev->sb_flags, 0,
9071 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9072 md_wakeup_thread(rdev->mddev->thread);
9077 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9079 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9084 s += rdev->new_data_offset;
9086 s += rdev->data_offset;
9087 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9088 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9089 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9092 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9094 static int md_notify_reboot(struct notifier_block *this,
9095 unsigned long code, void *x)
9097 struct list_head *tmp;
9098 struct mddev *mddev;
9101 for_each_mddev(mddev, tmp) {
9102 if (mddev_trylock(mddev)) {
9104 __md_stop_writes(mddev);
9105 if (mddev->persistent)
9106 mddev->safemode = 2;
9107 mddev_unlock(mddev);
9112 * certain more exotic SCSI devices are known to be
9113 * volatile wrt too early system reboots. While the
9114 * right place to handle this issue is the given
9115 * driver, we do want to have a safe RAID driver ...
9123 static struct notifier_block md_notifier = {
9124 .notifier_call = md_notify_reboot,
9126 .priority = INT_MAX, /* before any real devices */
9129 static void md_geninit(void)
9131 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9133 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9136 static int __init md_init(void)
9140 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9144 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9148 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9151 if ((ret = register_blkdev(0, "mdp")) < 0)
9155 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9156 md_probe, NULL, NULL);
9157 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9158 md_probe, NULL, NULL);
9160 register_reboot_notifier(&md_notifier);
9161 raid_table_header = register_sysctl_table(raid_root_table);
9167 unregister_blkdev(MD_MAJOR, "md");
9169 destroy_workqueue(md_misc_wq);
9171 destroy_workqueue(md_wq);
9176 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9178 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9179 struct md_rdev *rdev2, *tmp;
9181 char b[BDEVNAME_SIZE];
9184 * If size is changed in another node then we need to
9185 * do resize as well.
9187 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9188 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9190 pr_info("md-cluster: resize failed\n");
9192 bitmap_update_sb(mddev->bitmap);
9195 /* Check for change of roles in the active devices */
9196 rdev_for_each_safe(rdev2, tmp, mddev) {
9197 if (test_bit(Faulty, &rdev2->flags))
9200 /* Check if the roles changed */
9201 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9203 if (test_bit(Candidate, &rdev2->flags)) {
9204 if (role == 0xfffe) {
9205 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9206 md_kick_rdev_from_array(rdev2);
9210 clear_bit(Candidate, &rdev2->flags);
9213 if (role != rdev2->raid_disk) {
9215 if (rdev2->raid_disk == -1 && role != 0xffff) {
9216 rdev2->saved_raid_disk = role;
9217 ret = remove_and_add_spares(mddev, rdev2);
9218 pr_info("Activated spare: %s\n",
9219 bdevname(rdev2->bdev,b));
9220 /* wakeup mddev->thread here, so array could
9221 * perform resync with the new activated disk */
9222 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9223 md_wakeup_thread(mddev->thread);
9227 * We just want to do the minimum to mark the disk
9228 * as faulty. The recovery is performed by the
9229 * one who initiated the error.
9231 if ((role == 0xfffe) || (role == 0xfffd)) {
9232 md_error(mddev, rdev2);
9233 clear_bit(Blocked, &rdev2->flags);
9238 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9239 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9241 /* Finally set the event to be up to date */
9242 mddev->events = le64_to_cpu(sb->events);
9245 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9248 struct page *swapout = rdev->sb_page;
9249 struct mdp_superblock_1 *sb;
9251 /* Store the sb page of the rdev in the swapout temporary
9252 * variable in case we err in the future
9254 rdev->sb_page = NULL;
9255 err = alloc_disk_sb(rdev);
9257 ClearPageUptodate(rdev->sb_page);
9258 rdev->sb_loaded = 0;
9259 err = super_types[mddev->major_version].
9260 load_super(rdev, NULL, mddev->minor_version);
9263 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9264 __func__, __LINE__, rdev->desc_nr, err);
9266 put_page(rdev->sb_page);
9267 rdev->sb_page = swapout;
9268 rdev->sb_loaded = 1;
9272 sb = page_address(rdev->sb_page);
9273 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9277 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9278 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9280 /* The other node finished recovery, call spare_active to set
9281 * device In_sync and mddev->degraded
9283 if (rdev->recovery_offset == MaxSector &&
9284 !test_bit(In_sync, &rdev->flags) &&
9285 mddev->pers->spare_active(mddev))
9286 sysfs_notify(&mddev->kobj, NULL, "degraded");
9292 void md_reload_sb(struct mddev *mddev, int nr)
9294 struct md_rdev *rdev = NULL, *iter;
9298 rdev_for_each_rcu(iter, mddev) {
9299 if (iter->desc_nr == nr) {
9306 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9310 err = read_rdev(mddev, rdev);
9314 check_sb_changes(mddev, rdev);
9316 /* Read all rdev's to update recovery_offset */
9317 rdev_for_each_rcu(rdev, mddev)
9318 read_rdev(mddev, rdev);
9320 EXPORT_SYMBOL(md_reload_sb);
9325 * Searches all registered partitions for autorun RAID arrays
9329 static DEFINE_MUTEX(detected_devices_mutex);
9330 static LIST_HEAD(all_detected_devices);
9331 struct detected_devices_node {
9332 struct list_head list;
9336 void md_autodetect_dev(dev_t dev)
9338 struct detected_devices_node *node_detected_dev;
9340 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9341 if (node_detected_dev) {
9342 node_detected_dev->dev = dev;
9343 mutex_lock(&detected_devices_mutex);
9344 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9345 mutex_unlock(&detected_devices_mutex);
9349 static void autostart_arrays(int part)
9351 struct md_rdev *rdev;
9352 struct detected_devices_node *node_detected_dev;
9354 int i_scanned, i_passed;
9359 pr_info("md: Autodetecting RAID arrays.\n");
9361 mutex_lock(&detected_devices_mutex);
9362 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9364 node_detected_dev = list_entry(all_detected_devices.next,
9365 struct detected_devices_node, list);
9366 list_del(&node_detected_dev->list);
9367 dev = node_detected_dev->dev;
9368 kfree(node_detected_dev);
9369 mutex_unlock(&detected_devices_mutex);
9370 rdev = md_import_device(dev,0, 90);
9371 mutex_lock(&detected_devices_mutex);
9375 if (test_bit(Faulty, &rdev->flags))
9378 set_bit(AutoDetected, &rdev->flags);
9379 list_add(&rdev->same_set, &pending_raid_disks);
9382 mutex_unlock(&detected_devices_mutex);
9384 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9386 autorun_devices(part);
9389 #endif /* !MODULE */
9391 static __exit void md_exit(void)
9393 struct mddev *mddev;
9394 struct list_head *tmp;
9397 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9398 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9400 unregister_blkdev(MD_MAJOR,"md");
9401 unregister_blkdev(mdp_major, "mdp");
9402 unregister_reboot_notifier(&md_notifier);
9403 unregister_sysctl_table(raid_table_header);
9405 /* We cannot unload the modules while some process is
9406 * waiting for us in select() or poll() - wake them up
9409 while (waitqueue_active(&md_event_waiters)) {
9410 /* not safe to leave yet */
9411 wake_up(&md_event_waiters);
9415 remove_proc_entry("mdstat", NULL);
9417 for_each_mddev(mddev, tmp) {
9418 export_array(mddev);
9420 mddev->hold_active = 0;
9422 * for_each_mddev() will call mddev_put() at the end of each
9423 * iteration. As the mddev is now fully clear, this will
9424 * schedule the mddev for destruction by a workqueue, and the
9425 * destroy_workqueue() below will wait for that to complete.
9428 destroy_workqueue(md_misc_wq);
9429 destroy_workqueue(md_wq);
9432 subsys_initcall(md_init);
9433 module_exit(md_exit)
9435 static int get_ro(char *buffer, struct kernel_param *kp)
9437 return sprintf(buffer, "%d", start_readonly);
9439 static int set_ro(const char *val, struct kernel_param *kp)
9441 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9444 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9445 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9446 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9447 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9449 MODULE_LICENSE("GPL");
9450 MODULE_DESCRIPTION("MD RAID framework");
9452 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);