2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/sched/signal.h>
48 #include <linux/kthread.h>
49 #include <linux/blkdev.h>
50 #include <linux/badblocks.h>
51 #include <linux/sysctl.h>
52 #include <linux/seq_file.h>
54 #include <linux/poll.h>
55 #include <linux/ctype.h>
56 #include <linux/string.h>
57 #include <linux/hdreg.h>
58 #include <linux/proc_fs.h>
59 #include <linux/random.h>
60 #include <linux/module.h>
61 #include <linux/reboot.h>
62 #include <linux/file.h>
63 #include <linux/compat.h>
64 #include <linux/delay.h>
65 #include <linux/raid/md_p.h>
66 #include <linux/raid/md_u.h>
67 #include <linux/slab.h>
68 #include <linux/percpu-refcount.h>
70 #include <trace/events/block.h>
72 #include "md-bitmap.h"
73 #include "md-cluster.h"
76 static void autostart_arrays(int part);
79 /* pers_list is a list of registered personalities protected
81 * pers_lock does extra service to protect accesses to
82 * mddev->thread when the mutex cannot be held.
84 static LIST_HEAD(pers_list);
85 static DEFINE_SPINLOCK(pers_lock);
87 static struct kobj_type md_ktype;
89 struct md_cluster_operations *md_cluster_ops;
90 EXPORT_SYMBOL(md_cluster_ops);
91 struct module *md_cluster_mod;
92 EXPORT_SYMBOL(md_cluster_mod);
94 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
95 static struct workqueue_struct *md_wq;
96 static struct workqueue_struct *md_misc_wq;
98 static int remove_and_add_spares(struct mddev *mddev,
99 struct md_rdev *this);
100 static void mddev_detach(struct mddev *mddev);
103 * Default number of read corrections we'll attempt on an rdev
104 * before ejecting it from the array. We divide the read error
105 * count by 2 for every hour elapsed between read errors.
107 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
109 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
110 * is 1000 KB/sec, so the extra system load does not show up that much.
111 * Increase it if you want to have more _guaranteed_ speed. Note that
112 * the RAID driver will use the maximum available bandwidth if the IO
113 * subsystem is idle. There is also an 'absolute maximum' reconstruction
114 * speed limit - in case reconstruction slows down your system despite
117 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
118 * or /sys/block/mdX/md/sync_speed_{min,max}
121 static int sysctl_speed_limit_min = 1000;
122 static int sysctl_speed_limit_max = 200000;
123 static inline int speed_min(struct mddev *mddev)
125 return mddev->sync_speed_min ?
126 mddev->sync_speed_min : sysctl_speed_limit_min;
129 static inline int speed_max(struct mddev *mddev)
131 return mddev->sync_speed_max ?
132 mddev->sync_speed_max : sysctl_speed_limit_max;
135 static void * flush_info_alloc(gfp_t gfp_flags, void *data)
137 return kzalloc(sizeof(struct flush_info), gfp_flags);
139 static void flush_info_free(void *flush_info, void *data)
144 static void * flush_bio_alloc(gfp_t gfp_flags, void *data)
146 return kzalloc(sizeof(struct flush_bio), gfp_flags);
148 static void flush_bio_free(void *flush_bio, void *data)
153 static struct ctl_table_header *raid_table_header;
155 static struct ctl_table raid_table[] = {
157 .procname = "speed_limit_min",
158 .data = &sysctl_speed_limit_min,
159 .maxlen = sizeof(int),
160 .mode = S_IRUGO|S_IWUSR,
161 .proc_handler = proc_dointvec,
164 .procname = "speed_limit_max",
165 .data = &sysctl_speed_limit_max,
166 .maxlen = sizeof(int),
167 .mode = S_IRUGO|S_IWUSR,
168 .proc_handler = proc_dointvec,
173 static struct ctl_table raid_dir_table[] = {
177 .mode = S_IRUGO|S_IXUGO,
183 static struct ctl_table raid_root_table[] = {
188 .child = raid_dir_table,
193 static const struct block_device_operations md_fops;
195 static int start_readonly;
198 * The original mechanism for creating an md device is to create
199 * a device node in /dev and to open it. This causes races with device-close.
200 * The preferred method is to write to the "new_array" module parameter.
201 * This can avoid races.
202 * Setting create_on_open to false disables the original mechanism
203 * so all the races disappear.
205 static bool create_on_open = true;
207 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
212 if (!mddev || !bioset_initialized(&mddev->bio_set))
213 return bio_alloc(gfp_mask, nr_iovecs);
215 b = bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set);
220 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
222 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
224 if (!mddev || !bioset_initialized(&mddev->sync_set))
225 return bio_alloc(GFP_NOIO, 1);
227 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
231 * We have a system wide 'event count' that is incremented
232 * on any 'interesting' event, and readers of /proc/mdstat
233 * can use 'poll' or 'select' to find out when the event
237 * start array, stop array, error, add device, remove device,
238 * start build, activate spare
240 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
241 static atomic_t md_event_count;
242 void md_new_event(struct mddev *mddev)
244 atomic_inc(&md_event_count);
245 wake_up(&md_event_waiters);
247 EXPORT_SYMBOL_GPL(md_new_event);
250 * Enables to iterate over all existing md arrays
251 * all_mddevs_lock protects this list.
253 static LIST_HEAD(all_mddevs);
254 static DEFINE_SPINLOCK(all_mddevs_lock);
257 * iterates through all used mddevs in the system.
258 * We take care to grab the all_mddevs_lock whenever navigating
259 * the list, and to always hold a refcount when unlocked.
260 * Any code which breaks out of this loop while own
261 * a reference to the current mddev and must mddev_put it.
263 #define for_each_mddev(_mddev,_tmp) \
265 for (({ spin_lock(&all_mddevs_lock); \
266 _tmp = all_mddevs.next; \
268 ({ if (_tmp != &all_mddevs) \
269 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
270 spin_unlock(&all_mddevs_lock); \
271 if (_mddev) mddev_put(_mddev); \
272 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
273 _tmp != &all_mddevs;}); \
274 ({ spin_lock(&all_mddevs_lock); \
275 _tmp = _tmp->next;}) \
278 /* Rather than calling directly into the personality make_request function,
279 * IO requests come here first so that we can check if the device is
280 * being suspended pending a reconfiguration.
281 * We hold a refcount over the call to ->make_request. By the time that
282 * call has finished, the bio has been linked into some internal structure
283 * and so is visible to ->quiesce(), so we don't need the refcount any more.
285 static bool is_suspended(struct mddev *mddev, struct bio *bio)
287 if (mddev->suspended)
289 if (bio_data_dir(bio) != WRITE)
291 if (mddev->suspend_lo >= mddev->suspend_hi)
293 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
295 if (bio_end_sector(bio) < mddev->suspend_lo)
300 void md_handle_request(struct mddev *mddev, struct bio *bio)
304 if (is_suspended(mddev, bio)) {
307 prepare_to_wait(&mddev->sb_wait, &__wait,
308 TASK_UNINTERRUPTIBLE);
309 if (!is_suspended(mddev, bio))
315 finish_wait(&mddev->sb_wait, &__wait);
317 atomic_inc(&mddev->active_io);
320 if (!mddev->pers->make_request(mddev, bio)) {
321 atomic_dec(&mddev->active_io);
322 wake_up(&mddev->sb_wait);
323 goto check_suspended;
326 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
327 wake_up(&mddev->sb_wait);
329 EXPORT_SYMBOL(md_handle_request);
331 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
333 const int rw = bio_data_dir(bio);
334 const int sgrp = op_stat_group(bio_op(bio));
335 struct mddev *mddev = q->queuedata;
336 unsigned int sectors;
339 blk_queue_split(q, &bio);
341 if (mddev == NULL || mddev->pers == NULL) {
343 return BLK_QC_T_NONE;
345 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
346 if (bio_sectors(bio) != 0)
347 bio->bi_status = BLK_STS_IOERR;
349 return BLK_QC_T_NONE;
353 * save the sectors now since our bio can
354 * go away inside make_request
356 sectors = bio_sectors(bio);
357 /* bio could be mergeable after passing to underlayer */
358 bio->bi_opf &= ~REQ_NOMERGE;
360 md_handle_request(mddev, bio);
362 cpu = part_stat_lock();
363 part_stat_inc(cpu, &mddev->gendisk->part0, ios[sgrp]);
364 part_stat_add(cpu, &mddev->gendisk->part0, sectors[sgrp], sectors);
367 return BLK_QC_T_NONE;
370 /* mddev_suspend makes sure no new requests are submitted
371 * to the device, and that any requests that have been submitted
372 * are completely handled.
373 * Once mddev_detach() is called and completes, the module will be
376 void mddev_suspend(struct mddev *mddev)
378 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
379 lockdep_assert_held(&mddev->reconfig_mutex);
380 if (mddev->suspended++)
383 wake_up(&mddev->sb_wait);
384 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
385 smp_mb__after_atomic();
386 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
387 mddev->pers->quiesce(mddev, 1);
388 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
389 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
391 del_timer_sync(&mddev->safemode_timer);
393 EXPORT_SYMBOL_GPL(mddev_suspend);
395 void mddev_resume(struct mddev *mddev)
397 lockdep_assert_held(&mddev->reconfig_mutex);
398 if (--mddev->suspended)
400 wake_up(&mddev->sb_wait);
401 mddev->pers->quiesce(mddev, 0);
403 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
404 md_wakeup_thread(mddev->thread);
405 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
407 EXPORT_SYMBOL_GPL(mddev_resume);
409 int mddev_congested(struct mddev *mddev, int bits)
411 struct md_personality *pers = mddev->pers;
415 if (mddev->suspended)
417 else if (pers && pers->congested)
418 ret = pers->congested(mddev, bits);
422 EXPORT_SYMBOL_GPL(mddev_congested);
423 static int md_congested(void *data, int bits)
425 struct mddev *mddev = data;
426 return mddev_congested(mddev, bits);
430 * Generic flush handling for md
432 static void submit_flushes(struct work_struct *ws)
434 struct flush_info *fi = container_of(ws, struct flush_info, flush_work);
435 struct mddev *mddev = fi->mddev;
436 struct bio *bio = fi->bio;
438 bio->bi_opf &= ~REQ_PREFLUSH;
439 md_handle_request(mddev, bio);
441 mempool_free(fi, mddev->flush_pool);
444 static void md_end_flush(struct bio *fbio)
446 struct flush_bio *fb = fbio->bi_private;
447 struct md_rdev *rdev = fb->rdev;
448 struct flush_info *fi = fb->fi;
449 struct bio *bio = fi->bio;
450 struct mddev *mddev = fi->mddev;
452 rdev_dec_pending(rdev, mddev);
454 if (atomic_dec_and_test(&fi->flush_pending)) {
455 if (bio->bi_iter.bi_size == 0)
456 /* an empty barrier - all done */
459 INIT_WORK(&fi->flush_work, submit_flushes);
460 queue_work(md_wq, &fi->flush_work);
464 mempool_free(fb, mddev->flush_bio_pool);
468 void md_flush_request(struct mddev *mddev, struct bio *bio)
470 struct md_rdev *rdev;
471 struct flush_info *fi;
473 fi = mempool_alloc(mddev->flush_pool, GFP_NOIO);
477 atomic_set(&fi->flush_pending, 1);
480 rdev_for_each_rcu(rdev, mddev)
481 if (rdev->raid_disk >= 0 &&
482 !test_bit(Faulty, &rdev->flags)) {
483 /* Take two references, one is dropped
484 * when request finishes, one after
485 * we reclaim rcu_read_lock
488 struct flush_bio *fb;
489 atomic_inc(&rdev->nr_pending);
490 atomic_inc(&rdev->nr_pending);
493 fb = mempool_alloc(mddev->flush_bio_pool, GFP_NOIO);
497 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
498 bio_set_dev(bi, rdev->bdev);
499 bi->bi_end_io = md_end_flush;
501 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
503 atomic_inc(&fi->flush_pending);
507 rdev_dec_pending(rdev, mddev);
511 if (atomic_dec_and_test(&fi->flush_pending)) {
512 if (bio->bi_iter.bi_size == 0)
513 /* an empty barrier - all done */
516 INIT_WORK(&fi->flush_work, submit_flushes);
517 queue_work(md_wq, &fi->flush_work);
521 EXPORT_SYMBOL(md_flush_request);
523 static inline struct mddev *mddev_get(struct mddev *mddev)
525 atomic_inc(&mddev->active);
529 static void mddev_delayed_delete(struct work_struct *ws);
531 static void mddev_put(struct mddev *mddev)
533 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
535 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
536 mddev->ctime == 0 && !mddev->hold_active) {
537 /* Array is not configured at all, and not held active,
539 list_del_init(&mddev->all_mddevs);
542 * Call queue_work inside the spinlock so that
543 * flush_workqueue() after mddev_find will succeed in waiting
544 * for the work to be done.
546 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
547 queue_work(md_misc_wq, &mddev->del_work);
549 spin_unlock(&all_mddevs_lock);
552 static void md_safemode_timeout(struct timer_list *t);
554 void mddev_init(struct mddev *mddev)
556 kobject_init(&mddev->kobj, &md_ktype);
557 mutex_init(&mddev->open_mutex);
558 mutex_init(&mddev->reconfig_mutex);
559 mutex_init(&mddev->bitmap_info.mutex);
560 INIT_LIST_HEAD(&mddev->disks);
561 INIT_LIST_HEAD(&mddev->all_mddevs);
562 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
563 atomic_set(&mddev->active, 1);
564 atomic_set(&mddev->openers, 0);
565 atomic_set(&mddev->active_io, 0);
566 spin_lock_init(&mddev->lock);
567 init_waitqueue_head(&mddev->sb_wait);
568 init_waitqueue_head(&mddev->recovery_wait);
569 mddev->reshape_position = MaxSector;
570 mddev->reshape_backwards = 0;
571 mddev->last_sync_action = "none";
572 mddev->resync_min = 0;
573 mddev->resync_max = MaxSector;
574 mddev->level = LEVEL_NONE;
576 EXPORT_SYMBOL_GPL(mddev_init);
578 static struct mddev *mddev_find(dev_t unit)
580 struct mddev *mddev, *new = NULL;
582 if (unit && MAJOR(unit) != MD_MAJOR)
583 unit &= ~((1<<MdpMinorShift)-1);
586 spin_lock(&all_mddevs_lock);
589 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
590 if (mddev->unit == unit) {
592 spin_unlock(&all_mddevs_lock);
598 list_add(&new->all_mddevs, &all_mddevs);
599 spin_unlock(&all_mddevs_lock);
600 new->hold_active = UNTIL_IOCTL;
604 /* find an unused unit number */
605 static int next_minor = 512;
606 int start = next_minor;
610 dev = MKDEV(MD_MAJOR, next_minor);
612 if (next_minor > MINORMASK)
614 if (next_minor == start) {
615 /* Oh dear, all in use. */
616 spin_unlock(&all_mddevs_lock);
622 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
623 if (mddev->unit == dev) {
629 new->md_minor = MINOR(dev);
630 new->hold_active = UNTIL_STOP;
631 list_add(&new->all_mddevs, &all_mddevs);
632 spin_unlock(&all_mddevs_lock);
635 spin_unlock(&all_mddevs_lock);
637 new = kzalloc(sizeof(*new), GFP_KERNEL);
642 if (MAJOR(unit) == MD_MAJOR)
643 new->md_minor = MINOR(unit);
645 new->md_minor = MINOR(unit) >> MdpMinorShift;
652 static struct attribute_group md_redundancy_group;
654 void mddev_unlock(struct mddev *mddev)
656 if (mddev->to_remove) {
657 /* These cannot be removed under reconfig_mutex as
658 * an access to the files will try to take reconfig_mutex
659 * while holding the file unremovable, which leads to
661 * So hold set sysfs_active while the remove in happeing,
662 * and anything else which might set ->to_remove or my
663 * otherwise change the sysfs namespace will fail with
664 * -EBUSY if sysfs_active is still set.
665 * We set sysfs_active under reconfig_mutex and elsewhere
666 * test it under the same mutex to ensure its correct value
669 struct attribute_group *to_remove = mddev->to_remove;
670 mddev->to_remove = NULL;
671 mddev->sysfs_active = 1;
672 mutex_unlock(&mddev->reconfig_mutex);
674 if (mddev->kobj.sd) {
675 if (to_remove != &md_redundancy_group)
676 sysfs_remove_group(&mddev->kobj, to_remove);
677 if (mddev->pers == NULL ||
678 mddev->pers->sync_request == NULL) {
679 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
680 if (mddev->sysfs_action)
681 sysfs_put(mddev->sysfs_action);
682 mddev->sysfs_action = NULL;
685 mddev->sysfs_active = 0;
687 mutex_unlock(&mddev->reconfig_mutex);
689 /* As we've dropped the mutex we need a spinlock to
690 * make sure the thread doesn't disappear
692 spin_lock(&pers_lock);
693 md_wakeup_thread(mddev->thread);
694 wake_up(&mddev->sb_wait);
695 spin_unlock(&pers_lock);
697 EXPORT_SYMBOL_GPL(mddev_unlock);
699 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
701 struct md_rdev *rdev;
703 rdev_for_each_rcu(rdev, mddev)
704 if (rdev->desc_nr == nr)
709 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
711 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
713 struct md_rdev *rdev;
715 rdev_for_each(rdev, mddev)
716 if (rdev->bdev->bd_dev == dev)
722 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
724 struct md_rdev *rdev;
726 rdev_for_each_rcu(rdev, mddev)
727 if (rdev->bdev->bd_dev == dev)
732 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
734 static struct md_personality *find_pers(int level, char *clevel)
736 struct md_personality *pers;
737 list_for_each_entry(pers, &pers_list, list) {
738 if (level != LEVEL_NONE && pers->level == level)
740 if (strcmp(pers->name, clevel)==0)
746 /* return the offset of the super block in 512byte sectors */
747 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
749 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
750 return MD_NEW_SIZE_SECTORS(num_sectors);
753 static int alloc_disk_sb(struct md_rdev *rdev)
755 rdev->sb_page = alloc_page(GFP_KERNEL);
761 void md_rdev_clear(struct md_rdev *rdev)
764 put_page(rdev->sb_page);
766 rdev->sb_page = NULL;
771 put_page(rdev->bb_page);
772 rdev->bb_page = NULL;
774 badblocks_exit(&rdev->badblocks);
776 EXPORT_SYMBOL_GPL(md_rdev_clear);
778 static void super_written(struct bio *bio)
780 struct md_rdev *rdev = bio->bi_private;
781 struct mddev *mddev = rdev->mddev;
783 if (bio->bi_status) {
784 pr_err("md: super_written gets error=%d\n", bio->bi_status);
785 md_error(mddev, rdev);
786 if (!test_bit(Faulty, &rdev->flags)
787 && (bio->bi_opf & MD_FAILFAST)) {
788 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
789 set_bit(LastDev, &rdev->flags);
792 clear_bit(LastDev, &rdev->flags);
794 if (atomic_dec_and_test(&mddev->pending_writes))
795 wake_up(&mddev->sb_wait);
796 rdev_dec_pending(rdev, mddev);
800 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
801 sector_t sector, int size, struct page *page)
803 /* write first size bytes of page to sector of rdev
804 * Increment mddev->pending_writes before returning
805 * and decrement it on completion, waking up sb_wait
806 * if zero is reached.
807 * If an error occurred, call md_error
815 if (test_bit(Faulty, &rdev->flags))
818 bio = md_bio_alloc_sync(mddev);
820 atomic_inc(&rdev->nr_pending);
822 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
823 bio->bi_iter.bi_sector = sector;
824 bio_add_page(bio, page, size, 0);
825 bio->bi_private = rdev;
826 bio->bi_end_io = super_written;
828 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
829 test_bit(FailFast, &rdev->flags) &&
830 !test_bit(LastDev, &rdev->flags))
832 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
834 atomic_inc(&mddev->pending_writes);
838 int md_super_wait(struct mddev *mddev)
840 /* wait for all superblock writes that were scheduled to complete */
841 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
842 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
847 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
848 struct page *page, int op, int op_flags, bool metadata_op)
850 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
853 if (metadata_op && rdev->meta_bdev)
854 bio_set_dev(bio, rdev->meta_bdev);
856 bio_set_dev(bio, rdev->bdev);
857 bio_set_op_attrs(bio, op, op_flags);
859 bio->bi_iter.bi_sector = sector + rdev->sb_start;
860 else if (rdev->mddev->reshape_position != MaxSector &&
861 (rdev->mddev->reshape_backwards ==
862 (sector >= rdev->mddev->reshape_position)))
863 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
865 bio->bi_iter.bi_sector = sector + rdev->data_offset;
866 bio_add_page(bio, page, size, 0);
868 submit_bio_wait(bio);
870 ret = !bio->bi_status;
874 EXPORT_SYMBOL_GPL(sync_page_io);
876 static int read_disk_sb(struct md_rdev *rdev, int size)
878 char b[BDEVNAME_SIZE];
883 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
889 pr_err("md: disabled device %s, could not read superblock.\n",
890 bdevname(rdev->bdev,b));
894 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
896 return sb1->set_uuid0 == sb2->set_uuid0 &&
897 sb1->set_uuid1 == sb2->set_uuid1 &&
898 sb1->set_uuid2 == sb2->set_uuid2 &&
899 sb1->set_uuid3 == sb2->set_uuid3;
902 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
905 mdp_super_t *tmp1, *tmp2;
907 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
908 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
910 if (!tmp1 || !tmp2) {
919 * nr_disks is not constant
924 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
931 static u32 md_csum_fold(u32 csum)
933 csum = (csum & 0xffff) + (csum >> 16);
934 return (csum & 0xffff) + (csum >> 16);
937 static unsigned int calc_sb_csum(mdp_super_t *sb)
940 u32 *sb32 = (u32*)sb;
942 unsigned int disk_csum, csum;
944 disk_csum = sb->sb_csum;
947 for (i = 0; i < MD_SB_BYTES/4 ; i++)
949 csum = (newcsum & 0xffffffff) + (newcsum>>32);
952 /* This used to use csum_partial, which was wrong for several
953 * reasons including that different results are returned on
954 * different architectures. It isn't critical that we get exactly
955 * the same return value as before (we always csum_fold before
956 * testing, and that removes any differences). However as we
957 * know that csum_partial always returned a 16bit value on
958 * alphas, do a fold to maximise conformity to previous behaviour.
960 sb->sb_csum = md_csum_fold(disk_csum);
962 sb->sb_csum = disk_csum;
968 * Handle superblock details.
969 * We want to be able to handle multiple superblock formats
970 * so we have a common interface to them all, and an array of
971 * different handlers.
972 * We rely on user-space to write the initial superblock, and support
973 * reading and updating of superblocks.
974 * Interface methods are:
975 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
976 * loads and validates a superblock on dev.
977 * if refdev != NULL, compare superblocks on both devices
979 * 0 - dev has a superblock that is compatible with refdev
980 * 1 - dev has a superblock that is compatible and newer than refdev
981 * so dev should be used as the refdev in future
982 * -EINVAL superblock incompatible or invalid
983 * -othererror e.g. -EIO
985 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
986 * Verify that dev is acceptable into mddev.
987 * The first time, mddev->raid_disks will be 0, and data from
988 * dev should be merged in. Subsequent calls check that dev
989 * is new enough. Return 0 or -EINVAL
991 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
992 * Update the superblock for rdev with data in mddev
993 * This does not write to disc.
999 struct module *owner;
1000 int (*load_super)(struct md_rdev *rdev,
1001 struct md_rdev *refdev,
1003 int (*validate_super)(struct mddev *mddev,
1004 struct md_rdev *rdev);
1005 void (*sync_super)(struct mddev *mddev,
1006 struct md_rdev *rdev);
1007 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1008 sector_t num_sectors);
1009 int (*allow_new_offset)(struct md_rdev *rdev,
1010 unsigned long long new_offset);
1014 * Check that the given mddev has no bitmap.
1016 * This function is called from the run method of all personalities that do not
1017 * support bitmaps. It prints an error message and returns non-zero if mddev
1018 * has a bitmap. Otherwise, it returns 0.
1021 int md_check_no_bitmap(struct mddev *mddev)
1023 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1025 pr_warn("%s: bitmaps are not supported for %s\n",
1026 mdname(mddev), mddev->pers->name);
1029 EXPORT_SYMBOL(md_check_no_bitmap);
1032 * load_super for 0.90.0
1034 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1036 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1041 * Calculate the position of the superblock (512byte sectors),
1042 * it's at the end of the disk.
1044 * It also happens to be a multiple of 4Kb.
1046 rdev->sb_start = calc_dev_sboffset(rdev);
1048 ret = read_disk_sb(rdev, MD_SB_BYTES);
1054 bdevname(rdev->bdev, b);
1055 sb = page_address(rdev->sb_page);
1057 if (sb->md_magic != MD_SB_MAGIC) {
1058 pr_warn("md: invalid raid superblock magic on %s\n", b);
1062 if (sb->major_version != 0 ||
1063 sb->minor_version < 90 ||
1064 sb->minor_version > 91) {
1065 pr_warn("Bad version number %d.%d on %s\n",
1066 sb->major_version, sb->minor_version, b);
1070 if (sb->raid_disks <= 0)
1073 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1074 pr_warn("md: invalid superblock checksum on %s\n", b);
1078 rdev->preferred_minor = sb->md_minor;
1079 rdev->data_offset = 0;
1080 rdev->new_data_offset = 0;
1081 rdev->sb_size = MD_SB_BYTES;
1082 rdev->badblocks.shift = -1;
1084 if (sb->level == LEVEL_MULTIPATH)
1087 rdev->desc_nr = sb->this_disk.number;
1093 mdp_super_t *refsb = page_address(refdev->sb_page);
1094 if (!md_uuid_equal(refsb, sb)) {
1095 pr_warn("md: %s has different UUID to %s\n",
1096 b, bdevname(refdev->bdev,b2));
1099 if (!md_sb_equal(refsb, sb)) {
1100 pr_warn("md: %s has same UUID but different superblock to %s\n",
1101 b, bdevname(refdev->bdev, b2));
1105 ev2 = md_event(refsb);
1111 rdev->sectors = rdev->sb_start;
1112 /* Limit to 4TB as metadata cannot record more than that.
1113 * (not needed for Linear and RAID0 as metadata doesn't
1116 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1118 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1120 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1121 /* "this cannot possibly happen" ... */
1129 * validate_super for 0.90.0
1131 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1134 mdp_super_t *sb = page_address(rdev->sb_page);
1135 __u64 ev1 = md_event(sb);
1137 rdev->raid_disk = -1;
1138 clear_bit(Faulty, &rdev->flags);
1139 clear_bit(In_sync, &rdev->flags);
1140 clear_bit(Bitmap_sync, &rdev->flags);
1141 clear_bit(WriteMostly, &rdev->flags);
1143 if (mddev->raid_disks == 0) {
1144 mddev->major_version = 0;
1145 mddev->minor_version = sb->minor_version;
1146 mddev->patch_version = sb->patch_version;
1147 mddev->external = 0;
1148 mddev->chunk_sectors = sb->chunk_size >> 9;
1149 mddev->ctime = sb->ctime;
1150 mddev->utime = sb->utime;
1151 mddev->level = sb->level;
1152 mddev->clevel[0] = 0;
1153 mddev->layout = sb->layout;
1154 mddev->raid_disks = sb->raid_disks;
1155 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1156 mddev->events = ev1;
1157 mddev->bitmap_info.offset = 0;
1158 mddev->bitmap_info.space = 0;
1159 /* bitmap can use 60 K after the 4K superblocks */
1160 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1161 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1162 mddev->reshape_backwards = 0;
1164 if (mddev->minor_version >= 91) {
1165 mddev->reshape_position = sb->reshape_position;
1166 mddev->delta_disks = sb->delta_disks;
1167 mddev->new_level = sb->new_level;
1168 mddev->new_layout = sb->new_layout;
1169 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1170 if (mddev->delta_disks < 0)
1171 mddev->reshape_backwards = 1;
1173 mddev->reshape_position = MaxSector;
1174 mddev->delta_disks = 0;
1175 mddev->new_level = mddev->level;
1176 mddev->new_layout = mddev->layout;
1177 mddev->new_chunk_sectors = mddev->chunk_sectors;
1180 if (sb->state & (1<<MD_SB_CLEAN))
1181 mddev->recovery_cp = MaxSector;
1183 if (sb->events_hi == sb->cp_events_hi &&
1184 sb->events_lo == sb->cp_events_lo) {
1185 mddev->recovery_cp = sb->recovery_cp;
1187 mddev->recovery_cp = 0;
1190 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1191 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1192 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1193 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1195 mddev->max_disks = MD_SB_DISKS;
1197 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1198 mddev->bitmap_info.file == NULL) {
1199 mddev->bitmap_info.offset =
1200 mddev->bitmap_info.default_offset;
1201 mddev->bitmap_info.space =
1202 mddev->bitmap_info.default_space;
1205 } else if (mddev->pers == NULL) {
1206 /* Insist on good event counter while assembling, except
1207 * for spares (which don't need an event count) */
1209 if (sb->disks[rdev->desc_nr].state & (
1210 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1211 if (ev1 < mddev->events)
1213 } else if (mddev->bitmap) {
1214 /* if adding to array with a bitmap, then we can accept an
1215 * older device ... but not too old.
1217 if (ev1 < mddev->bitmap->events_cleared)
1219 if (ev1 < mddev->events)
1220 set_bit(Bitmap_sync, &rdev->flags);
1222 if (ev1 < mddev->events)
1223 /* just a hot-add of a new device, leave raid_disk at -1 */
1227 if (mddev->level != LEVEL_MULTIPATH) {
1228 desc = sb->disks + rdev->desc_nr;
1230 if (desc->state & (1<<MD_DISK_FAULTY))
1231 set_bit(Faulty, &rdev->flags);
1232 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1233 desc->raid_disk < mddev->raid_disks */) {
1234 set_bit(In_sync, &rdev->flags);
1235 rdev->raid_disk = desc->raid_disk;
1236 rdev->saved_raid_disk = desc->raid_disk;
1237 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1238 /* active but not in sync implies recovery up to
1239 * reshape position. We don't know exactly where
1240 * that is, so set to zero for now */
1241 if (mddev->minor_version >= 91) {
1242 rdev->recovery_offset = 0;
1243 rdev->raid_disk = desc->raid_disk;
1246 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1247 set_bit(WriteMostly, &rdev->flags);
1248 if (desc->state & (1<<MD_DISK_FAILFAST))
1249 set_bit(FailFast, &rdev->flags);
1250 } else /* MULTIPATH are always insync */
1251 set_bit(In_sync, &rdev->flags);
1256 * sync_super for 0.90.0
1258 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1261 struct md_rdev *rdev2;
1262 int next_spare = mddev->raid_disks;
1264 /* make rdev->sb match mddev data..
1267 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1268 * 3/ any empty disks < next_spare become removed
1270 * disks[0] gets initialised to REMOVED because
1271 * we cannot be sure from other fields if it has
1272 * been initialised or not.
1275 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1277 rdev->sb_size = MD_SB_BYTES;
1279 sb = page_address(rdev->sb_page);
1281 memset(sb, 0, sizeof(*sb));
1283 sb->md_magic = MD_SB_MAGIC;
1284 sb->major_version = mddev->major_version;
1285 sb->patch_version = mddev->patch_version;
1286 sb->gvalid_words = 0; /* ignored */
1287 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1288 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1289 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1290 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1292 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1293 sb->level = mddev->level;
1294 sb->size = mddev->dev_sectors / 2;
1295 sb->raid_disks = mddev->raid_disks;
1296 sb->md_minor = mddev->md_minor;
1297 sb->not_persistent = 0;
1298 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1300 sb->events_hi = (mddev->events>>32);
1301 sb->events_lo = (u32)mddev->events;
1303 if (mddev->reshape_position == MaxSector)
1304 sb->minor_version = 90;
1306 sb->minor_version = 91;
1307 sb->reshape_position = mddev->reshape_position;
1308 sb->new_level = mddev->new_level;
1309 sb->delta_disks = mddev->delta_disks;
1310 sb->new_layout = mddev->new_layout;
1311 sb->new_chunk = mddev->new_chunk_sectors << 9;
1313 mddev->minor_version = sb->minor_version;
1316 sb->recovery_cp = mddev->recovery_cp;
1317 sb->cp_events_hi = (mddev->events>>32);
1318 sb->cp_events_lo = (u32)mddev->events;
1319 if (mddev->recovery_cp == MaxSector)
1320 sb->state = (1<< MD_SB_CLEAN);
1322 sb->recovery_cp = 0;
1324 sb->layout = mddev->layout;
1325 sb->chunk_size = mddev->chunk_sectors << 9;
1327 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1328 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1330 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1331 rdev_for_each(rdev2, mddev) {
1334 int is_active = test_bit(In_sync, &rdev2->flags);
1336 if (rdev2->raid_disk >= 0 &&
1337 sb->minor_version >= 91)
1338 /* we have nowhere to store the recovery_offset,
1339 * but if it is not below the reshape_position,
1340 * we can piggy-back on that.
1343 if (rdev2->raid_disk < 0 ||
1344 test_bit(Faulty, &rdev2->flags))
1347 desc_nr = rdev2->raid_disk;
1349 desc_nr = next_spare++;
1350 rdev2->desc_nr = desc_nr;
1351 d = &sb->disks[rdev2->desc_nr];
1353 d->number = rdev2->desc_nr;
1354 d->major = MAJOR(rdev2->bdev->bd_dev);
1355 d->minor = MINOR(rdev2->bdev->bd_dev);
1357 d->raid_disk = rdev2->raid_disk;
1359 d->raid_disk = rdev2->desc_nr; /* compatibility */
1360 if (test_bit(Faulty, &rdev2->flags))
1361 d->state = (1<<MD_DISK_FAULTY);
1362 else if (is_active) {
1363 d->state = (1<<MD_DISK_ACTIVE);
1364 if (test_bit(In_sync, &rdev2->flags))
1365 d->state |= (1<<MD_DISK_SYNC);
1373 if (test_bit(WriteMostly, &rdev2->flags))
1374 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1375 if (test_bit(FailFast, &rdev2->flags))
1376 d->state |= (1<<MD_DISK_FAILFAST);
1378 /* now set the "removed" and "faulty" bits on any missing devices */
1379 for (i=0 ; i < mddev->raid_disks ; i++) {
1380 mdp_disk_t *d = &sb->disks[i];
1381 if (d->state == 0 && d->number == 0) {
1384 d->state = (1<<MD_DISK_REMOVED);
1385 d->state |= (1<<MD_DISK_FAULTY);
1389 sb->nr_disks = nr_disks;
1390 sb->active_disks = active;
1391 sb->working_disks = working;
1392 sb->failed_disks = failed;
1393 sb->spare_disks = spare;
1395 sb->this_disk = sb->disks[rdev->desc_nr];
1396 sb->sb_csum = calc_sb_csum(sb);
1400 * rdev_size_change for 0.90.0
1402 static unsigned long long
1403 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1405 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1406 return 0; /* component must fit device */
1407 if (rdev->mddev->bitmap_info.offset)
1408 return 0; /* can't move bitmap */
1409 rdev->sb_start = calc_dev_sboffset(rdev);
1410 if (!num_sectors || num_sectors > rdev->sb_start)
1411 num_sectors = rdev->sb_start;
1412 /* Limit to 4TB as metadata cannot record more than that.
1413 * 4TB == 2^32 KB, or 2*2^32 sectors.
1415 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1416 rdev->mddev->level >= 1)
1417 num_sectors = (sector_t)(2ULL << 32) - 2;
1419 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1421 } while (md_super_wait(rdev->mddev) < 0);
1426 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1428 /* non-zero offset changes not possible with v0.90 */
1429 return new_offset == 0;
1433 * version 1 superblock
1436 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1440 unsigned long long newcsum;
1441 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1442 __le32 *isuper = (__le32*)sb;
1444 disk_csum = sb->sb_csum;
1447 for (; size >= 4; size -= 4)
1448 newcsum += le32_to_cpu(*isuper++);
1451 newcsum += le16_to_cpu(*(__le16*) isuper);
1453 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1454 sb->sb_csum = disk_csum;
1455 return cpu_to_le32(csum);
1458 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1460 struct mdp_superblock_1 *sb;
1464 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1468 * Calculate the position of the superblock in 512byte sectors.
1469 * It is always aligned to a 4K boundary and
1470 * depeding on minor_version, it can be:
1471 * 0: At least 8K, but less than 12K, from end of device
1472 * 1: At start of device
1473 * 2: 4K from start of device.
1475 switch(minor_version) {
1477 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1479 sb_start &= ~(sector_t)(4*2-1);
1490 rdev->sb_start = sb_start;
1492 /* superblock is rarely larger than 1K, but it can be larger,
1493 * and it is safe to read 4k, so we do that
1495 ret = read_disk_sb(rdev, 4096);
1496 if (ret) return ret;
1498 sb = page_address(rdev->sb_page);
1500 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1501 sb->major_version != cpu_to_le32(1) ||
1502 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1503 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1504 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1507 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1508 pr_warn("md: invalid superblock checksum on %s\n",
1509 bdevname(rdev->bdev,b));
1512 if (le64_to_cpu(sb->data_size) < 10) {
1513 pr_warn("md: data_size too small on %s\n",
1514 bdevname(rdev->bdev,b));
1519 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1520 /* Some padding is non-zero, might be a new feature */
1523 rdev->preferred_minor = 0xffff;
1524 rdev->data_offset = le64_to_cpu(sb->data_offset);
1525 rdev->new_data_offset = rdev->data_offset;
1526 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1527 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1528 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1529 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1531 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1532 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1533 if (rdev->sb_size & bmask)
1534 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1537 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1540 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1543 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1546 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1548 if (!rdev->bb_page) {
1549 rdev->bb_page = alloc_page(GFP_KERNEL);
1553 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1554 rdev->badblocks.count == 0) {
1555 /* need to load the bad block list.
1556 * Currently we limit it to one page.
1562 int sectors = le16_to_cpu(sb->bblog_size);
1563 if (sectors > (PAGE_SIZE / 512))
1565 offset = le32_to_cpu(sb->bblog_offset);
1568 bb_sector = (long long)offset;
1569 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1570 rdev->bb_page, REQ_OP_READ, 0, true))
1572 bbp = (u64 *)page_address(rdev->bb_page);
1573 rdev->badblocks.shift = sb->bblog_shift;
1574 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1575 u64 bb = le64_to_cpu(*bbp);
1576 int count = bb & (0x3ff);
1577 u64 sector = bb >> 10;
1578 sector <<= sb->bblog_shift;
1579 count <<= sb->bblog_shift;
1582 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1585 } else if (sb->bblog_offset != 0)
1586 rdev->badblocks.shift = 0;
1588 if ((le32_to_cpu(sb->feature_map) &
1589 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1590 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1591 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1592 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1599 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1601 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1602 sb->level != refsb->level ||
1603 sb->layout != refsb->layout ||
1604 sb->chunksize != refsb->chunksize) {
1605 pr_warn("md: %s has strangely different superblock to %s\n",
1606 bdevname(rdev->bdev,b),
1607 bdevname(refdev->bdev,b2));
1610 ev1 = le64_to_cpu(sb->events);
1611 ev2 = le64_to_cpu(refsb->events);
1618 if (minor_version) {
1619 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1620 sectors -= rdev->data_offset;
1622 sectors = rdev->sb_start;
1623 if (sectors < le64_to_cpu(sb->data_size))
1625 rdev->sectors = le64_to_cpu(sb->data_size);
1629 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1631 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1632 __u64 ev1 = le64_to_cpu(sb->events);
1634 rdev->raid_disk = -1;
1635 clear_bit(Faulty, &rdev->flags);
1636 clear_bit(In_sync, &rdev->flags);
1637 clear_bit(Bitmap_sync, &rdev->flags);
1638 clear_bit(WriteMostly, &rdev->flags);
1640 if (mddev->raid_disks == 0) {
1641 mddev->major_version = 1;
1642 mddev->patch_version = 0;
1643 mddev->external = 0;
1644 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1645 mddev->ctime = le64_to_cpu(sb->ctime);
1646 mddev->utime = le64_to_cpu(sb->utime);
1647 mddev->level = le32_to_cpu(sb->level);
1648 mddev->clevel[0] = 0;
1649 mddev->layout = le32_to_cpu(sb->layout);
1650 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1651 mddev->dev_sectors = le64_to_cpu(sb->size);
1652 mddev->events = ev1;
1653 mddev->bitmap_info.offset = 0;
1654 mddev->bitmap_info.space = 0;
1655 /* Default location for bitmap is 1K after superblock
1656 * using 3K - total of 4K
1658 mddev->bitmap_info.default_offset = 1024 >> 9;
1659 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1660 mddev->reshape_backwards = 0;
1662 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1663 memcpy(mddev->uuid, sb->set_uuid, 16);
1665 mddev->max_disks = (4096-256)/2;
1667 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1668 mddev->bitmap_info.file == NULL) {
1669 mddev->bitmap_info.offset =
1670 (__s32)le32_to_cpu(sb->bitmap_offset);
1671 /* Metadata doesn't record how much space is available.
1672 * For 1.0, we assume we can use up to the superblock
1673 * if before, else to 4K beyond superblock.
1674 * For others, assume no change is possible.
1676 if (mddev->minor_version > 0)
1677 mddev->bitmap_info.space = 0;
1678 else if (mddev->bitmap_info.offset > 0)
1679 mddev->bitmap_info.space =
1680 8 - mddev->bitmap_info.offset;
1682 mddev->bitmap_info.space =
1683 -mddev->bitmap_info.offset;
1686 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1687 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1688 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1689 mddev->new_level = le32_to_cpu(sb->new_level);
1690 mddev->new_layout = le32_to_cpu(sb->new_layout);
1691 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1692 if (mddev->delta_disks < 0 ||
1693 (mddev->delta_disks == 0 &&
1694 (le32_to_cpu(sb->feature_map)
1695 & MD_FEATURE_RESHAPE_BACKWARDS)))
1696 mddev->reshape_backwards = 1;
1698 mddev->reshape_position = MaxSector;
1699 mddev->delta_disks = 0;
1700 mddev->new_level = mddev->level;
1701 mddev->new_layout = mddev->layout;
1702 mddev->new_chunk_sectors = mddev->chunk_sectors;
1705 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1706 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1708 if (le32_to_cpu(sb->feature_map) &
1709 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1710 if (le32_to_cpu(sb->feature_map) &
1711 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1713 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1714 (le32_to_cpu(sb->feature_map) &
1715 MD_FEATURE_MULTIPLE_PPLS))
1717 set_bit(MD_HAS_PPL, &mddev->flags);
1719 } else if (mddev->pers == NULL) {
1720 /* Insist of good event counter while assembling, except for
1721 * spares (which don't need an event count) */
1723 if (rdev->desc_nr >= 0 &&
1724 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1725 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1726 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1727 if (ev1 < mddev->events)
1729 } else if (mddev->bitmap) {
1730 /* If adding to array with a bitmap, then we can accept an
1731 * older device, but not too old.
1733 if (ev1 < mddev->bitmap->events_cleared)
1735 if (ev1 < mddev->events)
1736 set_bit(Bitmap_sync, &rdev->flags);
1738 if (ev1 < mddev->events)
1739 /* just a hot-add of a new device, leave raid_disk at -1 */
1742 if (mddev->level != LEVEL_MULTIPATH) {
1744 if (rdev->desc_nr < 0 ||
1745 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1746 role = MD_DISK_ROLE_SPARE;
1749 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1751 case MD_DISK_ROLE_SPARE: /* spare */
1753 case MD_DISK_ROLE_FAULTY: /* faulty */
1754 set_bit(Faulty, &rdev->flags);
1756 case MD_DISK_ROLE_JOURNAL: /* journal device */
1757 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1758 /* journal device without journal feature */
1759 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1762 set_bit(Journal, &rdev->flags);
1763 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1764 rdev->raid_disk = 0;
1767 rdev->saved_raid_disk = role;
1768 if ((le32_to_cpu(sb->feature_map) &
1769 MD_FEATURE_RECOVERY_OFFSET)) {
1770 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1771 if (!(le32_to_cpu(sb->feature_map) &
1772 MD_FEATURE_RECOVERY_BITMAP))
1773 rdev->saved_raid_disk = -1;
1775 set_bit(In_sync, &rdev->flags);
1776 rdev->raid_disk = role;
1777 if (role >= mddev->raid_disks) {
1778 rdev->saved_raid_disk = -1;
1779 rdev->raid_disk = -1;
1783 if (sb->devflags & WriteMostly1)
1784 set_bit(WriteMostly, &rdev->flags);
1785 if (sb->devflags & FailFast1)
1786 set_bit(FailFast, &rdev->flags);
1787 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1788 set_bit(Replacement, &rdev->flags);
1789 } else /* MULTIPATH are always insync */
1790 set_bit(In_sync, &rdev->flags);
1795 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1797 struct mdp_superblock_1 *sb;
1798 struct md_rdev *rdev2;
1800 /* make rdev->sb match mddev and rdev data. */
1802 sb = page_address(rdev->sb_page);
1804 sb->feature_map = 0;
1806 sb->recovery_offset = cpu_to_le64(0);
1807 memset(sb->pad3, 0, sizeof(sb->pad3));
1809 sb->utime = cpu_to_le64((__u64)mddev->utime);
1810 sb->events = cpu_to_le64(mddev->events);
1812 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1813 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1814 sb->resync_offset = cpu_to_le64(MaxSector);
1816 sb->resync_offset = cpu_to_le64(0);
1818 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1820 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1821 sb->size = cpu_to_le64(mddev->dev_sectors);
1822 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1823 sb->level = cpu_to_le32(mddev->level);
1824 sb->layout = cpu_to_le32(mddev->layout);
1825 if (test_bit(FailFast, &rdev->flags))
1826 sb->devflags |= FailFast1;
1828 sb->devflags &= ~FailFast1;
1830 if (test_bit(WriteMostly, &rdev->flags))
1831 sb->devflags |= WriteMostly1;
1833 sb->devflags &= ~WriteMostly1;
1834 sb->data_offset = cpu_to_le64(rdev->data_offset);
1835 sb->data_size = cpu_to_le64(rdev->sectors);
1837 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1838 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1839 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1842 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1843 !test_bit(In_sync, &rdev->flags)) {
1845 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1846 sb->recovery_offset =
1847 cpu_to_le64(rdev->recovery_offset);
1848 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1850 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1852 /* Note: recovery_offset and journal_tail share space */
1853 if (test_bit(Journal, &rdev->flags))
1854 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1855 if (test_bit(Replacement, &rdev->flags))
1857 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1859 if (mddev->reshape_position != MaxSector) {
1860 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1861 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1862 sb->new_layout = cpu_to_le32(mddev->new_layout);
1863 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1864 sb->new_level = cpu_to_le32(mddev->new_level);
1865 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1866 if (mddev->delta_disks == 0 &&
1867 mddev->reshape_backwards)
1869 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1870 if (rdev->new_data_offset != rdev->data_offset) {
1872 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1873 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1874 - rdev->data_offset));
1878 if (mddev_is_clustered(mddev))
1879 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1881 if (rdev->badblocks.count == 0)
1882 /* Nothing to do for bad blocks*/ ;
1883 else if (sb->bblog_offset == 0)
1884 /* Cannot record bad blocks on this device */
1885 md_error(mddev, rdev);
1887 struct badblocks *bb = &rdev->badblocks;
1888 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1890 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1895 seq = read_seqbegin(&bb->lock);
1897 memset(bbp, 0xff, PAGE_SIZE);
1899 for (i = 0 ; i < bb->count ; i++) {
1900 u64 internal_bb = p[i];
1901 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1902 | BB_LEN(internal_bb));
1903 bbp[i] = cpu_to_le64(store_bb);
1906 if (read_seqretry(&bb->lock, seq))
1909 bb->sector = (rdev->sb_start +
1910 (int)le32_to_cpu(sb->bblog_offset));
1911 bb->size = le16_to_cpu(sb->bblog_size);
1916 rdev_for_each(rdev2, mddev)
1917 if (rdev2->desc_nr+1 > max_dev)
1918 max_dev = rdev2->desc_nr+1;
1920 if (max_dev > le32_to_cpu(sb->max_dev)) {
1922 sb->max_dev = cpu_to_le32(max_dev);
1923 rdev->sb_size = max_dev * 2 + 256;
1924 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1925 if (rdev->sb_size & bmask)
1926 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1928 max_dev = le32_to_cpu(sb->max_dev);
1930 for (i=0; i<max_dev;i++)
1931 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1933 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1934 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1936 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
1937 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
1939 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
1941 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
1942 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
1943 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
1946 rdev_for_each(rdev2, mddev) {
1948 if (test_bit(Faulty, &rdev2->flags))
1949 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1950 else if (test_bit(In_sync, &rdev2->flags))
1951 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1952 else if (test_bit(Journal, &rdev2->flags))
1953 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1954 else if (rdev2->raid_disk >= 0)
1955 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1957 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1960 sb->sb_csum = calc_sb_1_csum(sb);
1963 static unsigned long long
1964 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1966 struct mdp_superblock_1 *sb;
1967 sector_t max_sectors;
1968 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1969 return 0; /* component must fit device */
1970 if (rdev->data_offset != rdev->new_data_offset)
1971 return 0; /* too confusing */
1972 if (rdev->sb_start < rdev->data_offset) {
1973 /* minor versions 1 and 2; superblock before data */
1974 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1975 max_sectors -= rdev->data_offset;
1976 if (!num_sectors || num_sectors > max_sectors)
1977 num_sectors = max_sectors;
1978 } else if (rdev->mddev->bitmap_info.offset) {
1979 /* minor version 0 with bitmap we can't move */
1982 /* minor version 0; superblock after data */
1984 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1985 sb_start &= ~(sector_t)(4*2 - 1);
1986 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1987 if (!num_sectors || num_sectors > max_sectors)
1988 num_sectors = max_sectors;
1989 rdev->sb_start = sb_start;
1991 sb = page_address(rdev->sb_page);
1992 sb->data_size = cpu_to_le64(num_sectors);
1993 sb->super_offset = cpu_to_le64(rdev->sb_start);
1994 sb->sb_csum = calc_sb_1_csum(sb);
1996 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1998 } while (md_super_wait(rdev->mddev) < 0);
2004 super_1_allow_new_offset(struct md_rdev *rdev,
2005 unsigned long long new_offset)
2007 /* All necessary checks on new >= old have been done */
2008 struct bitmap *bitmap;
2009 if (new_offset >= rdev->data_offset)
2012 /* with 1.0 metadata, there is no metadata to tread on
2013 * so we can always move back */
2014 if (rdev->mddev->minor_version == 0)
2017 /* otherwise we must be sure not to step on
2018 * any metadata, so stay:
2019 * 36K beyond start of superblock
2020 * beyond end of badblocks
2021 * beyond write-intent bitmap
2023 if (rdev->sb_start + (32+4)*2 > new_offset)
2025 bitmap = rdev->mddev->bitmap;
2026 if (bitmap && !rdev->mddev->bitmap_info.file &&
2027 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2028 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2030 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2036 static struct super_type super_types[] = {
2039 .owner = THIS_MODULE,
2040 .load_super = super_90_load,
2041 .validate_super = super_90_validate,
2042 .sync_super = super_90_sync,
2043 .rdev_size_change = super_90_rdev_size_change,
2044 .allow_new_offset = super_90_allow_new_offset,
2048 .owner = THIS_MODULE,
2049 .load_super = super_1_load,
2050 .validate_super = super_1_validate,
2051 .sync_super = super_1_sync,
2052 .rdev_size_change = super_1_rdev_size_change,
2053 .allow_new_offset = super_1_allow_new_offset,
2057 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2059 if (mddev->sync_super) {
2060 mddev->sync_super(mddev, rdev);
2064 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2066 super_types[mddev->major_version].sync_super(mddev, rdev);
2069 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2071 struct md_rdev *rdev, *rdev2;
2074 rdev_for_each_rcu(rdev, mddev1) {
2075 if (test_bit(Faulty, &rdev->flags) ||
2076 test_bit(Journal, &rdev->flags) ||
2077 rdev->raid_disk == -1)
2079 rdev_for_each_rcu(rdev2, mddev2) {
2080 if (test_bit(Faulty, &rdev2->flags) ||
2081 test_bit(Journal, &rdev2->flags) ||
2082 rdev2->raid_disk == -1)
2084 if (rdev->bdev->bd_contains ==
2085 rdev2->bdev->bd_contains) {
2095 static LIST_HEAD(pending_raid_disks);
2098 * Try to register data integrity profile for an mddev
2100 * This is called when an array is started and after a disk has been kicked
2101 * from the array. It only succeeds if all working and active component devices
2102 * are integrity capable with matching profiles.
2104 int md_integrity_register(struct mddev *mddev)
2106 struct md_rdev *rdev, *reference = NULL;
2108 if (list_empty(&mddev->disks))
2109 return 0; /* nothing to do */
2110 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2111 return 0; /* shouldn't register, or already is */
2112 rdev_for_each(rdev, mddev) {
2113 /* skip spares and non-functional disks */
2114 if (test_bit(Faulty, &rdev->flags))
2116 if (rdev->raid_disk < 0)
2119 /* Use the first rdev as the reference */
2123 /* does this rdev's profile match the reference profile? */
2124 if (blk_integrity_compare(reference->bdev->bd_disk,
2125 rdev->bdev->bd_disk) < 0)
2128 if (!reference || !bdev_get_integrity(reference->bdev))
2131 * All component devices are integrity capable and have matching
2132 * profiles, register the common profile for the md device.
2134 blk_integrity_register(mddev->gendisk,
2135 bdev_get_integrity(reference->bdev));
2137 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2138 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2139 pr_err("md: failed to create integrity pool for %s\n",
2145 EXPORT_SYMBOL(md_integrity_register);
2148 * Attempt to add an rdev, but only if it is consistent with the current
2151 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2153 struct blk_integrity *bi_rdev;
2154 struct blk_integrity *bi_mddev;
2155 char name[BDEVNAME_SIZE];
2157 if (!mddev->gendisk)
2160 bi_rdev = bdev_get_integrity(rdev->bdev);
2161 bi_mddev = blk_get_integrity(mddev->gendisk);
2163 if (!bi_mddev) /* nothing to do */
2166 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2167 pr_err("%s: incompatible integrity profile for %s\n",
2168 mdname(mddev), bdevname(rdev->bdev, name));
2174 EXPORT_SYMBOL(md_integrity_add_rdev);
2176 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2178 char b[BDEVNAME_SIZE];
2182 /* prevent duplicates */
2183 if (find_rdev(mddev, rdev->bdev->bd_dev))
2186 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2190 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2191 if (!test_bit(Journal, &rdev->flags) &&
2193 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2195 /* Cannot change size, so fail
2196 * If mddev->level <= 0, then we don't care
2197 * about aligning sizes (e.g. linear)
2199 if (mddev->level > 0)
2202 mddev->dev_sectors = rdev->sectors;
2205 /* Verify rdev->desc_nr is unique.
2206 * If it is -1, assign a free number, else
2207 * check number is not in use
2210 if (rdev->desc_nr < 0) {
2213 choice = mddev->raid_disks;
2214 while (md_find_rdev_nr_rcu(mddev, choice))
2216 rdev->desc_nr = choice;
2218 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2224 if (!test_bit(Journal, &rdev->flags) &&
2225 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2226 pr_warn("md: %s: array is limited to %d devices\n",
2227 mdname(mddev), mddev->max_disks);
2230 bdevname(rdev->bdev,b);
2231 strreplace(b, '/', '!');
2233 rdev->mddev = mddev;
2234 pr_debug("md: bind<%s>\n", b);
2236 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2239 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2240 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2241 /* failure here is OK */;
2242 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2244 list_add_rcu(&rdev->same_set, &mddev->disks);
2245 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2247 /* May as well allow recovery to be retried once */
2248 mddev->recovery_disabled++;
2253 pr_warn("md: failed to register dev-%s for %s\n",
2258 static void md_delayed_delete(struct work_struct *ws)
2260 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2261 kobject_del(&rdev->kobj);
2262 kobject_put(&rdev->kobj);
2265 static void unbind_rdev_from_array(struct md_rdev *rdev)
2267 char b[BDEVNAME_SIZE];
2269 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2270 list_del_rcu(&rdev->same_set);
2271 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2273 sysfs_remove_link(&rdev->kobj, "block");
2274 sysfs_put(rdev->sysfs_state);
2275 rdev->sysfs_state = NULL;
2276 rdev->badblocks.count = 0;
2277 /* We need to delay this, otherwise we can deadlock when
2278 * writing to 'remove' to "dev/state". We also need
2279 * to delay it due to rcu usage.
2282 INIT_WORK(&rdev->del_work, md_delayed_delete);
2283 kobject_get(&rdev->kobj);
2284 queue_work(md_misc_wq, &rdev->del_work);
2288 * prevent the device from being mounted, repartitioned or
2289 * otherwise reused by a RAID array (or any other kernel
2290 * subsystem), by bd_claiming the device.
2292 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2295 struct block_device *bdev;
2296 char b[BDEVNAME_SIZE];
2298 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2299 shared ? (struct md_rdev *)lock_rdev : rdev);
2301 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2302 return PTR_ERR(bdev);
2308 static void unlock_rdev(struct md_rdev *rdev)
2310 struct block_device *bdev = rdev->bdev;
2312 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2315 void md_autodetect_dev(dev_t dev);
2317 static void export_rdev(struct md_rdev *rdev)
2319 char b[BDEVNAME_SIZE];
2321 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2322 md_rdev_clear(rdev);
2324 if (test_bit(AutoDetected, &rdev->flags))
2325 md_autodetect_dev(rdev->bdev->bd_dev);
2328 kobject_put(&rdev->kobj);
2331 void md_kick_rdev_from_array(struct md_rdev *rdev)
2333 unbind_rdev_from_array(rdev);
2336 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2338 static void export_array(struct mddev *mddev)
2340 struct md_rdev *rdev;
2342 while (!list_empty(&mddev->disks)) {
2343 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2345 md_kick_rdev_from_array(rdev);
2347 mddev->raid_disks = 0;
2348 mddev->major_version = 0;
2351 static bool set_in_sync(struct mddev *mddev)
2353 lockdep_assert_held(&mddev->lock);
2354 if (!mddev->in_sync) {
2355 mddev->sync_checkers++;
2356 spin_unlock(&mddev->lock);
2357 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2358 spin_lock(&mddev->lock);
2359 if (!mddev->in_sync &&
2360 percpu_ref_is_zero(&mddev->writes_pending)) {
2363 * Ensure ->in_sync is visible before we clear
2367 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2368 sysfs_notify_dirent_safe(mddev->sysfs_state);
2370 if (--mddev->sync_checkers == 0)
2371 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2373 if (mddev->safemode == 1)
2374 mddev->safemode = 0;
2375 return mddev->in_sync;
2378 static void sync_sbs(struct mddev *mddev, int nospares)
2380 /* Update each superblock (in-memory image), but
2381 * if we are allowed to, skip spares which already
2382 * have the right event counter, or have one earlier
2383 * (which would mean they aren't being marked as dirty
2384 * with the rest of the array)
2386 struct md_rdev *rdev;
2387 rdev_for_each(rdev, mddev) {
2388 if (rdev->sb_events == mddev->events ||
2390 rdev->raid_disk < 0 &&
2391 rdev->sb_events+1 == mddev->events)) {
2392 /* Don't update this superblock */
2393 rdev->sb_loaded = 2;
2395 sync_super(mddev, rdev);
2396 rdev->sb_loaded = 1;
2401 static bool does_sb_need_changing(struct mddev *mddev)
2403 struct md_rdev *rdev;
2404 struct mdp_superblock_1 *sb;
2407 /* Find a good rdev */
2408 rdev_for_each(rdev, mddev)
2409 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2412 /* No good device found. */
2416 sb = page_address(rdev->sb_page);
2417 /* Check if a device has become faulty or a spare become active */
2418 rdev_for_each(rdev, mddev) {
2419 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2420 /* Device activated? */
2421 if (role == 0xffff && rdev->raid_disk >=0 &&
2422 !test_bit(Faulty, &rdev->flags))
2424 /* Device turned faulty? */
2425 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2429 /* Check if any mddev parameters have changed */
2430 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2431 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2432 (mddev->layout != le32_to_cpu(sb->layout)) ||
2433 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2434 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2440 void md_update_sb(struct mddev *mddev, int force_change)
2442 struct md_rdev *rdev;
2445 int any_badblocks_changed = 0;
2450 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2455 if (mddev_is_clustered(mddev)) {
2456 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2458 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2460 ret = md_cluster_ops->metadata_update_start(mddev);
2461 /* Has someone else has updated the sb */
2462 if (!does_sb_need_changing(mddev)) {
2464 md_cluster_ops->metadata_update_cancel(mddev);
2465 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2466 BIT(MD_SB_CHANGE_DEVS) |
2467 BIT(MD_SB_CHANGE_CLEAN));
2473 * First make sure individual recovery_offsets are correct
2474 * curr_resync_completed can only be used during recovery.
2475 * During reshape/resync it might use array-addresses rather
2476 * that device addresses.
2478 rdev_for_each(rdev, mddev) {
2479 if (rdev->raid_disk >= 0 &&
2480 mddev->delta_disks >= 0 &&
2481 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2482 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2483 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2484 !test_bit(Journal, &rdev->flags) &&
2485 !test_bit(In_sync, &rdev->flags) &&
2486 mddev->curr_resync_completed > rdev->recovery_offset)
2487 rdev->recovery_offset = mddev->curr_resync_completed;
2490 if (!mddev->persistent) {
2491 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2492 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2493 if (!mddev->external) {
2494 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2495 rdev_for_each(rdev, mddev) {
2496 if (rdev->badblocks.changed) {
2497 rdev->badblocks.changed = 0;
2498 ack_all_badblocks(&rdev->badblocks);
2499 md_error(mddev, rdev);
2501 clear_bit(Blocked, &rdev->flags);
2502 clear_bit(BlockedBadBlocks, &rdev->flags);
2503 wake_up(&rdev->blocked_wait);
2506 wake_up(&mddev->sb_wait);
2510 spin_lock(&mddev->lock);
2512 mddev->utime = ktime_get_real_seconds();
2514 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2516 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2517 /* just a clean<-> dirty transition, possibly leave spares alone,
2518 * though if events isn't the right even/odd, we will have to do
2524 if (mddev->degraded)
2525 /* If the array is degraded, then skipping spares is both
2526 * dangerous and fairly pointless.
2527 * Dangerous because a device that was removed from the array
2528 * might have a event_count that still looks up-to-date,
2529 * so it can be re-added without a resync.
2530 * Pointless because if there are any spares to skip,
2531 * then a recovery will happen and soon that array won't
2532 * be degraded any more and the spare can go back to sleep then.
2536 sync_req = mddev->in_sync;
2538 /* If this is just a dirty<->clean transition, and the array is clean
2539 * and 'events' is odd, we can roll back to the previous clean state */
2541 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2542 && mddev->can_decrease_events
2543 && mddev->events != 1) {
2545 mddev->can_decrease_events = 0;
2547 /* otherwise we have to go forward and ... */
2549 mddev->can_decrease_events = nospares;
2553 * This 64-bit counter should never wrap.
2554 * Either we are in around ~1 trillion A.C., assuming
2555 * 1 reboot per second, or we have a bug...
2557 WARN_ON(mddev->events == 0);
2559 rdev_for_each(rdev, mddev) {
2560 if (rdev->badblocks.changed)
2561 any_badblocks_changed++;
2562 if (test_bit(Faulty, &rdev->flags))
2563 set_bit(FaultRecorded, &rdev->flags);
2566 sync_sbs(mddev, nospares);
2567 spin_unlock(&mddev->lock);
2569 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2570 mdname(mddev), mddev->in_sync);
2573 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2575 md_bitmap_update_sb(mddev->bitmap);
2576 rdev_for_each(rdev, mddev) {
2577 char b[BDEVNAME_SIZE];
2579 if (rdev->sb_loaded != 1)
2580 continue; /* no noise on spare devices */
2582 if (!test_bit(Faulty, &rdev->flags)) {
2583 md_super_write(mddev,rdev,
2584 rdev->sb_start, rdev->sb_size,
2586 pr_debug("md: (write) %s's sb offset: %llu\n",
2587 bdevname(rdev->bdev, b),
2588 (unsigned long long)rdev->sb_start);
2589 rdev->sb_events = mddev->events;
2590 if (rdev->badblocks.size) {
2591 md_super_write(mddev, rdev,
2592 rdev->badblocks.sector,
2593 rdev->badblocks.size << 9,
2595 rdev->badblocks.size = 0;
2599 pr_debug("md: %s (skipping faulty)\n",
2600 bdevname(rdev->bdev, b));
2602 if (mddev->level == LEVEL_MULTIPATH)
2603 /* only need to write one superblock... */
2606 if (md_super_wait(mddev) < 0)
2608 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2610 if (mddev_is_clustered(mddev) && ret == 0)
2611 md_cluster_ops->metadata_update_finish(mddev);
2613 if (mddev->in_sync != sync_req ||
2614 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2615 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2616 /* have to write it out again */
2618 wake_up(&mddev->sb_wait);
2619 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2620 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2622 rdev_for_each(rdev, mddev) {
2623 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2624 clear_bit(Blocked, &rdev->flags);
2626 if (any_badblocks_changed)
2627 ack_all_badblocks(&rdev->badblocks);
2628 clear_bit(BlockedBadBlocks, &rdev->flags);
2629 wake_up(&rdev->blocked_wait);
2632 EXPORT_SYMBOL(md_update_sb);
2634 static int add_bound_rdev(struct md_rdev *rdev)
2636 struct mddev *mddev = rdev->mddev;
2638 bool add_journal = test_bit(Journal, &rdev->flags);
2640 if (!mddev->pers->hot_remove_disk || add_journal) {
2641 /* If there is hot_add_disk but no hot_remove_disk
2642 * then added disks for geometry changes,
2643 * and should be added immediately.
2645 super_types[mddev->major_version].
2646 validate_super(mddev, rdev);
2648 mddev_suspend(mddev);
2649 err = mddev->pers->hot_add_disk(mddev, rdev);
2651 mddev_resume(mddev);
2653 md_kick_rdev_from_array(rdev);
2657 sysfs_notify_dirent_safe(rdev->sysfs_state);
2659 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2660 if (mddev->degraded)
2661 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2662 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2663 md_new_event(mddev);
2664 md_wakeup_thread(mddev->thread);
2668 /* words written to sysfs files may, or may not, be \n terminated.
2669 * We want to accept with case. For this we use cmd_match.
2671 static int cmd_match(const char *cmd, const char *str)
2673 /* See if cmd, written into a sysfs file, matches
2674 * str. They must either be the same, or cmd can
2675 * have a trailing newline
2677 while (*cmd && *str && *cmd == *str) {
2688 struct rdev_sysfs_entry {
2689 struct attribute attr;
2690 ssize_t (*show)(struct md_rdev *, char *);
2691 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2695 state_show(struct md_rdev *rdev, char *page)
2699 unsigned long flags = READ_ONCE(rdev->flags);
2701 if (test_bit(Faulty, &flags) ||
2702 (!test_bit(ExternalBbl, &flags) &&
2703 rdev->badblocks.unacked_exist))
2704 len += sprintf(page+len, "faulty%s", sep);
2705 if (test_bit(In_sync, &flags))
2706 len += sprintf(page+len, "in_sync%s", sep);
2707 if (test_bit(Journal, &flags))
2708 len += sprintf(page+len, "journal%s", sep);
2709 if (test_bit(WriteMostly, &flags))
2710 len += sprintf(page+len, "write_mostly%s", sep);
2711 if (test_bit(Blocked, &flags) ||
2712 (rdev->badblocks.unacked_exist
2713 && !test_bit(Faulty, &flags)))
2714 len += sprintf(page+len, "blocked%s", sep);
2715 if (!test_bit(Faulty, &flags) &&
2716 !test_bit(Journal, &flags) &&
2717 !test_bit(In_sync, &flags))
2718 len += sprintf(page+len, "spare%s", sep);
2719 if (test_bit(WriteErrorSeen, &flags))
2720 len += sprintf(page+len, "write_error%s", sep);
2721 if (test_bit(WantReplacement, &flags))
2722 len += sprintf(page+len, "want_replacement%s", sep);
2723 if (test_bit(Replacement, &flags))
2724 len += sprintf(page+len, "replacement%s", sep);
2725 if (test_bit(ExternalBbl, &flags))
2726 len += sprintf(page+len, "external_bbl%s", sep);
2727 if (test_bit(FailFast, &flags))
2728 len += sprintf(page+len, "failfast%s", sep);
2733 return len+sprintf(page+len, "\n");
2737 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2740 * faulty - simulates an error
2741 * remove - disconnects the device
2742 * writemostly - sets write_mostly
2743 * -writemostly - clears write_mostly
2744 * blocked - sets the Blocked flags
2745 * -blocked - clears the Blocked and possibly simulates an error
2746 * insync - sets Insync providing device isn't active
2747 * -insync - clear Insync for a device with a slot assigned,
2748 * so that it gets rebuilt based on bitmap
2749 * write_error - sets WriteErrorSeen
2750 * -write_error - clears WriteErrorSeen
2751 * {,-}failfast - set/clear FailFast
2754 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2755 md_error(rdev->mddev, rdev);
2756 if (test_bit(Faulty, &rdev->flags))
2760 } else if (cmd_match(buf, "remove")) {
2761 if (rdev->mddev->pers) {
2762 clear_bit(Blocked, &rdev->flags);
2763 remove_and_add_spares(rdev->mddev, rdev);
2765 if (rdev->raid_disk >= 0)
2768 struct mddev *mddev = rdev->mddev;
2770 if (mddev_is_clustered(mddev))
2771 err = md_cluster_ops->remove_disk(mddev, rdev);
2774 md_kick_rdev_from_array(rdev);
2776 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2777 md_wakeup_thread(mddev->thread);
2779 md_new_event(mddev);
2782 } else if (cmd_match(buf, "writemostly")) {
2783 set_bit(WriteMostly, &rdev->flags);
2785 } else if (cmd_match(buf, "-writemostly")) {
2786 clear_bit(WriteMostly, &rdev->flags);
2788 } else if (cmd_match(buf, "blocked")) {
2789 set_bit(Blocked, &rdev->flags);
2791 } else if (cmd_match(buf, "-blocked")) {
2792 if (!test_bit(Faulty, &rdev->flags) &&
2793 !test_bit(ExternalBbl, &rdev->flags) &&
2794 rdev->badblocks.unacked_exist) {
2795 /* metadata handler doesn't understand badblocks,
2796 * so we need to fail the device
2798 md_error(rdev->mddev, rdev);
2800 clear_bit(Blocked, &rdev->flags);
2801 clear_bit(BlockedBadBlocks, &rdev->flags);
2802 wake_up(&rdev->blocked_wait);
2803 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2804 md_wakeup_thread(rdev->mddev->thread);
2807 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2808 set_bit(In_sync, &rdev->flags);
2810 } else if (cmd_match(buf, "failfast")) {
2811 set_bit(FailFast, &rdev->flags);
2813 } else if (cmd_match(buf, "-failfast")) {
2814 clear_bit(FailFast, &rdev->flags);
2816 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2817 !test_bit(Journal, &rdev->flags)) {
2818 if (rdev->mddev->pers == NULL) {
2819 clear_bit(In_sync, &rdev->flags);
2820 rdev->saved_raid_disk = rdev->raid_disk;
2821 rdev->raid_disk = -1;
2824 } else if (cmd_match(buf, "write_error")) {
2825 set_bit(WriteErrorSeen, &rdev->flags);
2827 } else if (cmd_match(buf, "-write_error")) {
2828 clear_bit(WriteErrorSeen, &rdev->flags);
2830 } else if (cmd_match(buf, "want_replacement")) {
2831 /* Any non-spare device that is not a replacement can
2832 * become want_replacement at any time, but we then need to
2833 * check if recovery is needed.
2835 if (rdev->raid_disk >= 0 &&
2836 !test_bit(Journal, &rdev->flags) &&
2837 !test_bit(Replacement, &rdev->flags))
2838 set_bit(WantReplacement, &rdev->flags);
2839 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2840 md_wakeup_thread(rdev->mddev->thread);
2842 } else if (cmd_match(buf, "-want_replacement")) {
2843 /* Clearing 'want_replacement' is always allowed.
2844 * Once replacements starts it is too late though.
2847 clear_bit(WantReplacement, &rdev->flags);
2848 } else if (cmd_match(buf, "replacement")) {
2849 /* Can only set a device as a replacement when array has not
2850 * yet been started. Once running, replacement is automatic
2851 * from spares, or by assigning 'slot'.
2853 if (rdev->mddev->pers)
2856 set_bit(Replacement, &rdev->flags);
2859 } else if (cmd_match(buf, "-replacement")) {
2860 /* Similarly, can only clear Replacement before start */
2861 if (rdev->mddev->pers)
2864 clear_bit(Replacement, &rdev->flags);
2867 } else if (cmd_match(buf, "re-add")) {
2868 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2869 rdev->saved_raid_disk >= 0) {
2870 /* clear_bit is performed _after_ all the devices
2871 * have their local Faulty bit cleared. If any writes
2872 * happen in the meantime in the local node, they
2873 * will land in the local bitmap, which will be synced
2874 * by this node eventually
2876 if (!mddev_is_clustered(rdev->mddev) ||
2877 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2878 clear_bit(Faulty, &rdev->flags);
2879 err = add_bound_rdev(rdev);
2883 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2884 set_bit(ExternalBbl, &rdev->flags);
2885 rdev->badblocks.shift = 0;
2887 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2888 clear_bit(ExternalBbl, &rdev->flags);
2892 sysfs_notify_dirent_safe(rdev->sysfs_state);
2893 return err ? err : len;
2895 static struct rdev_sysfs_entry rdev_state =
2896 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2899 errors_show(struct md_rdev *rdev, char *page)
2901 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2905 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2910 rv = kstrtouint(buf, 10, &n);
2913 atomic_set(&rdev->corrected_errors, n);
2916 static struct rdev_sysfs_entry rdev_errors =
2917 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2920 slot_show(struct md_rdev *rdev, char *page)
2922 if (test_bit(Journal, &rdev->flags))
2923 return sprintf(page, "journal\n");
2924 else if (rdev->raid_disk < 0)
2925 return sprintf(page, "none\n");
2927 return sprintf(page, "%d\n", rdev->raid_disk);
2931 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2936 if (test_bit(Journal, &rdev->flags))
2938 if (strncmp(buf, "none", 4)==0)
2941 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2945 if (rdev->mddev->pers && slot == -1) {
2946 /* Setting 'slot' on an active array requires also
2947 * updating the 'rd%d' link, and communicating
2948 * with the personality with ->hot_*_disk.
2949 * For now we only support removing
2950 * failed/spare devices. This normally happens automatically,
2951 * but not when the metadata is externally managed.
2953 if (rdev->raid_disk == -1)
2955 /* personality does all needed checks */
2956 if (rdev->mddev->pers->hot_remove_disk == NULL)
2958 clear_bit(Blocked, &rdev->flags);
2959 remove_and_add_spares(rdev->mddev, rdev);
2960 if (rdev->raid_disk >= 0)
2962 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2963 md_wakeup_thread(rdev->mddev->thread);
2964 } else if (rdev->mddev->pers) {
2965 /* Activating a spare .. or possibly reactivating
2966 * if we ever get bitmaps working here.
2970 if (rdev->raid_disk != -1)
2973 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2976 if (rdev->mddev->pers->hot_add_disk == NULL)
2979 if (slot >= rdev->mddev->raid_disks &&
2980 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2983 rdev->raid_disk = slot;
2984 if (test_bit(In_sync, &rdev->flags))
2985 rdev->saved_raid_disk = slot;
2987 rdev->saved_raid_disk = -1;
2988 clear_bit(In_sync, &rdev->flags);
2989 clear_bit(Bitmap_sync, &rdev->flags);
2990 err = rdev->mddev->pers->
2991 hot_add_disk(rdev->mddev, rdev);
2993 rdev->raid_disk = -1;
2996 sysfs_notify_dirent_safe(rdev->sysfs_state);
2997 if (sysfs_link_rdev(rdev->mddev, rdev))
2998 /* failure here is OK */;
2999 /* don't wakeup anyone, leave that to userspace. */
3001 if (slot >= rdev->mddev->raid_disks &&
3002 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3004 rdev->raid_disk = slot;
3005 /* assume it is working */
3006 clear_bit(Faulty, &rdev->flags);
3007 clear_bit(WriteMostly, &rdev->flags);
3008 set_bit(In_sync, &rdev->flags);
3009 sysfs_notify_dirent_safe(rdev->sysfs_state);
3014 static struct rdev_sysfs_entry rdev_slot =
3015 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3018 offset_show(struct md_rdev *rdev, char *page)
3020 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3024 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3026 unsigned long long offset;
3027 if (kstrtoull(buf, 10, &offset) < 0)
3029 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3031 if (rdev->sectors && rdev->mddev->external)
3032 /* Must set offset before size, so overlap checks
3035 rdev->data_offset = offset;
3036 rdev->new_data_offset = offset;
3040 static struct rdev_sysfs_entry rdev_offset =
3041 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3043 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3045 return sprintf(page, "%llu\n",
3046 (unsigned long long)rdev->new_data_offset);
3049 static ssize_t new_offset_store(struct md_rdev *rdev,
3050 const char *buf, size_t len)
3052 unsigned long long new_offset;
3053 struct mddev *mddev = rdev->mddev;
3055 if (kstrtoull(buf, 10, &new_offset) < 0)
3058 if (mddev->sync_thread ||
3059 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3061 if (new_offset == rdev->data_offset)
3062 /* reset is always permitted */
3064 else if (new_offset > rdev->data_offset) {
3065 /* must not push array size beyond rdev_sectors */
3066 if (new_offset - rdev->data_offset
3067 + mddev->dev_sectors > rdev->sectors)
3070 /* Metadata worries about other space details. */
3072 /* decreasing the offset is inconsistent with a backwards
3075 if (new_offset < rdev->data_offset &&
3076 mddev->reshape_backwards)
3078 /* Increasing offset is inconsistent with forwards
3079 * reshape. reshape_direction should be set to
3080 * 'backwards' first.
3082 if (new_offset > rdev->data_offset &&
3083 !mddev->reshape_backwards)
3086 if (mddev->pers && mddev->persistent &&
3087 !super_types[mddev->major_version]
3088 .allow_new_offset(rdev, new_offset))
3090 rdev->new_data_offset = new_offset;
3091 if (new_offset > rdev->data_offset)
3092 mddev->reshape_backwards = 1;
3093 else if (new_offset < rdev->data_offset)
3094 mddev->reshape_backwards = 0;
3098 static struct rdev_sysfs_entry rdev_new_offset =
3099 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3102 rdev_size_show(struct md_rdev *rdev, char *page)
3104 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3107 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3109 /* check if two start/length pairs overlap */
3117 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3119 unsigned long long blocks;
3122 if (kstrtoull(buf, 10, &blocks) < 0)
3125 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3126 return -EINVAL; /* sector conversion overflow */
3129 if (new != blocks * 2)
3130 return -EINVAL; /* unsigned long long to sector_t overflow */
3137 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3139 struct mddev *my_mddev = rdev->mddev;
3140 sector_t oldsectors = rdev->sectors;
3143 if (test_bit(Journal, &rdev->flags))
3145 if (strict_blocks_to_sectors(buf, §ors) < 0)
3147 if (rdev->data_offset != rdev->new_data_offset)
3148 return -EINVAL; /* too confusing */
3149 if (my_mddev->pers && rdev->raid_disk >= 0) {
3150 if (my_mddev->persistent) {
3151 sectors = super_types[my_mddev->major_version].
3152 rdev_size_change(rdev, sectors);
3155 } else if (!sectors)
3156 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3158 if (!my_mddev->pers->resize)
3159 /* Cannot change size for RAID0 or Linear etc */
3162 if (sectors < my_mddev->dev_sectors)
3163 return -EINVAL; /* component must fit device */
3165 rdev->sectors = sectors;
3166 if (sectors > oldsectors && my_mddev->external) {
3167 /* Need to check that all other rdevs with the same
3168 * ->bdev do not overlap. 'rcu' is sufficient to walk
3169 * the rdev lists safely.
3170 * This check does not provide a hard guarantee, it
3171 * just helps avoid dangerous mistakes.
3173 struct mddev *mddev;
3175 struct list_head *tmp;
3178 for_each_mddev(mddev, tmp) {
3179 struct md_rdev *rdev2;
3181 rdev_for_each(rdev2, mddev)
3182 if (rdev->bdev == rdev2->bdev &&
3184 overlaps(rdev->data_offset, rdev->sectors,
3197 /* Someone else could have slipped in a size
3198 * change here, but doing so is just silly.
3199 * We put oldsectors back because we *know* it is
3200 * safe, and trust userspace not to race with
3203 rdev->sectors = oldsectors;
3210 static struct rdev_sysfs_entry rdev_size =
3211 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3213 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3215 unsigned long long recovery_start = rdev->recovery_offset;
3217 if (test_bit(In_sync, &rdev->flags) ||
3218 recovery_start == MaxSector)
3219 return sprintf(page, "none\n");
3221 return sprintf(page, "%llu\n", recovery_start);
3224 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3226 unsigned long long recovery_start;
3228 if (cmd_match(buf, "none"))
3229 recovery_start = MaxSector;
3230 else if (kstrtoull(buf, 10, &recovery_start))
3233 if (rdev->mddev->pers &&
3234 rdev->raid_disk >= 0)
3237 rdev->recovery_offset = recovery_start;
3238 if (recovery_start == MaxSector)
3239 set_bit(In_sync, &rdev->flags);
3241 clear_bit(In_sync, &rdev->flags);
3245 static struct rdev_sysfs_entry rdev_recovery_start =
3246 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3248 /* sysfs access to bad-blocks list.
3249 * We present two files.
3250 * 'bad-blocks' lists sector numbers and lengths of ranges that
3251 * are recorded as bad. The list is truncated to fit within
3252 * the one-page limit of sysfs.
3253 * Writing "sector length" to this file adds an acknowledged
3255 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3256 * been acknowledged. Writing to this file adds bad blocks
3257 * without acknowledging them. This is largely for testing.
3259 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3261 return badblocks_show(&rdev->badblocks, page, 0);
3263 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3265 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3266 /* Maybe that ack was all we needed */
3267 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3268 wake_up(&rdev->blocked_wait);
3271 static struct rdev_sysfs_entry rdev_bad_blocks =
3272 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3274 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3276 return badblocks_show(&rdev->badblocks, page, 1);
3278 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3280 return badblocks_store(&rdev->badblocks, page, len, 1);
3282 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3283 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3286 ppl_sector_show(struct md_rdev *rdev, char *page)
3288 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3292 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3294 unsigned long long sector;
3296 if (kstrtoull(buf, 10, §or) < 0)
3298 if (sector != (sector_t)sector)
3301 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3302 rdev->raid_disk >= 0)
3305 if (rdev->mddev->persistent) {
3306 if (rdev->mddev->major_version == 0)
3308 if ((sector > rdev->sb_start &&
3309 sector - rdev->sb_start > S16_MAX) ||
3310 (sector < rdev->sb_start &&
3311 rdev->sb_start - sector > -S16_MIN))
3313 rdev->ppl.offset = sector - rdev->sb_start;
3314 } else if (!rdev->mddev->external) {
3317 rdev->ppl.sector = sector;
3321 static struct rdev_sysfs_entry rdev_ppl_sector =
3322 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3325 ppl_size_show(struct md_rdev *rdev, char *page)
3327 return sprintf(page, "%u\n", rdev->ppl.size);
3331 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3335 if (kstrtouint(buf, 10, &size) < 0)
3338 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3339 rdev->raid_disk >= 0)
3342 if (rdev->mddev->persistent) {
3343 if (rdev->mddev->major_version == 0)
3347 } else if (!rdev->mddev->external) {
3350 rdev->ppl.size = size;
3354 static struct rdev_sysfs_entry rdev_ppl_size =
3355 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3357 static struct attribute *rdev_default_attrs[] = {
3362 &rdev_new_offset.attr,
3364 &rdev_recovery_start.attr,
3365 &rdev_bad_blocks.attr,
3366 &rdev_unack_bad_blocks.attr,
3367 &rdev_ppl_sector.attr,
3368 &rdev_ppl_size.attr,
3372 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3374 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3375 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3381 return entry->show(rdev, page);
3385 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3386 const char *page, size_t length)
3388 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3389 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3391 struct mddev *mddev = rdev->mddev;
3395 if (!capable(CAP_SYS_ADMIN))
3397 rv = mddev ? mddev_lock(mddev): -EBUSY;
3399 if (rdev->mddev == NULL)
3402 rv = entry->store(rdev, page, length);
3403 mddev_unlock(mddev);
3408 static void rdev_free(struct kobject *ko)
3410 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3413 static const struct sysfs_ops rdev_sysfs_ops = {
3414 .show = rdev_attr_show,
3415 .store = rdev_attr_store,
3417 static struct kobj_type rdev_ktype = {
3418 .release = rdev_free,
3419 .sysfs_ops = &rdev_sysfs_ops,
3420 .default_attrs = rdev_default_attrs,
3423 int md_rdev_init(struct md_rdev *rdev)
3426 rdev->saved_raid_disk = -1;
3427 rdev->raid_disk = -1;
3429 rdev->data_offset = 0;
3430 rdev->new_data_offset = 0;
3431 rdev->sb_events = 0;
3432 rdev->last_read_error = 0;
3433 rdev->sb_loaded = 0;
3434 rdev->bb_page = NULL;
3435 atomic_set(&rdev->nr_pending, 0);
3436 atomic_set(&rdev->read_errors, 0);
3437 atomic_set(&rdev->corrected_errors, 0);
3439 INIT_LIST_HEAD(&rdev->same_set);
3440 init_waitqueue_head(&rdev->blocked_wait);
3442 /* Add space to store bad block list.
3443 * This reserves the space even on arrays where it cannot
3444 * be used - I wonder if that matters
3446 return badblocks_init(&rdev->badblocks, 0);
3448 EXPORT_SYMBOL_GPL(md_rdev_init);
3450 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3452 * mark the device faulty if:
3454 * - the device is nonexistent (zero size)
3455 * - the device has no valid superblock
3457 * a faulty rdev _never_ has rdev->sb set.
3459 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3461 char b[BDEVNAME_SIZE];
3463 struct md_rdev *rdev;
3466 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3468 return ERR_PTR(-ENOMEM);
3470 err = md_rdev_init(rdev);
3473 err = alloc_disk_sb(rdev);
3477 err = lock_rdev(rdev, newdev, super_format == -2);
3481 kobject_init(&rdev->kobj, &rdev_ktype);
3483 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3485 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3486 bdevname(rdev->bdev,b));
3491 if (super_format >= 0) {
3492 err = super_types[super_format].
3493 load_super(rdev, NULL, super_minor);
3494 if (err == -EINVAL) {
3495 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3496 bdevname(rdev->bdev,b),
3497 super_format, super_minor);
3501 pr_warn("md: could not read %s's sb, not importing!\n",
3502 bdevname(rdev->bdev,b));
3512 md_rdev_clear(rdev);
3514 return ERR_PTR(err);
3518 * Check a full RAID array for plausibility
3521 static void analyze_sbs(struct mddev *mddev)
3524 struct md_rdev *rdev, *freshest, *tmp;
3525 char b[BDEVNAME_SIZE];
3528 rdev_for_each_safe(rdev, tmp, mddev)
3529 switch (super_types[mddev->major_version].
3530 load_super(rdev, freshest, mddev->minor_version)) {
3537 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3538 bdevname(rdev->bdev,b));
3539 md_kick_rdev_from_array(rdev);
3542 super_types[mddev->major_version].
3543 validate_super(mddev, freshest);
3546 rdev_for_each_safe(rdev, tmp, mddev) {
3547 if (mddev->max_disks &&
3548 (rdev->desc_nr >= mddev->max_disks ||
3549 i > mddev->max_disks)) {
3550 pr_warn("md: %s: %s: only %d devices permitted\n",
3551 mdname(mddev), bdevname(rdev->bdev, b),
3553 md_kick_rdev_from_array(rdev);
3556 if (rdev != freshest) {
3557 if (super_types[mddev->major_version].
3558 validate_super(mddev, rdev)) {
3559 pr_warn("md: kicking non-fresh %s from array!\n",
3560 bdevname(rdev->bdev,b));
3561 md_kick_rdev_from_array(rdev);
3565 if (mddev->level == LEVEL_MULTIPATH) {
3566 rdev->desc_nr = i++;
3567 rdev->raid_disk = rdev->desc_nr;
3568 set_bit(In_sync, &rdev->flags);
3569 } else if (rdev->raid_disk >=
3570 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3571 !test_bit(Journal, &rdev->flags)) {
3572 rdev->raid_disk = -1;
3573 clear_bit(In_sync, &rdev->flags);
3578 /* Read a fixed-point number.
3579 * Numbers in sysfs attributes should be in "standard" units where
3580 * possible, so time should be in seconds.
3581 * However we internally use a a much smaller unit such as
3582 * milliseconds or jiffies.
3583 * This function takes a decimal number with a possible fractional
3584 * component, and produces an integer which is the result of
3585 * multiplying that number by 10^'scale'.
3586 * all without any floating-point arithmetic.
3588 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3590 unsigned long result = 0;
3592 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3595 else if (decimals < scale) {
3598 result = result * 10 + value;
3610 while (decimals < scale) {
3619 safe_delay_show(struct mddev *mddev, char *page)
3621 int msec = (mddev->safemode_delay*1000)/HZ;
3622 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3625 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3629 if (mddev_is_clustered(mddev)) {
3630 pr_warn("md: Safemode is disabled for clustered mode\n");
3634 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3637 mddev->safemode_delay = 0;
3639 unsigned long old_delay = mddev->safemode_delay;
3640 unsigned long new_delay = (msec*HZ)/1000;
3644 mddev->safemode_delay = new_delay;
3645 if (new_delay < old_delay || old_delay == 0)
3646 mod_timer(&mddev->safemode_timer, jiffies+1);
3650 static struct md_sysfs_entry md_safe_delay =
3651 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3654 level_show(struct mddev *mddev, char *page)
3656 struct md_personality *p;
3658 spin_lock(&mddev->lock);
3661 ret = sprintf(page, "%s\n", p->name);
3662 else if (mddev->clevel[0])
3663 ret = sprintf(page, "%s\n", mddev->clevel);
3664 else if (mddev->level != LEVEL_NONE)
3665 ret = sprintf(page, "%d\n", mddev->level);
3668 spin_unlock(&mddev->lock);
3673 level_store(struct mddev *mddev, const char *buf, size_t len)
3678 struct md_personality *pers, *oldpers;
3680 void *priv, *oldpriv;
3681 struct md_rdev *rdev;
3683 if (slen == 0 || slen >= sizeof(clevel))
3686 rv = mddev_lock(mddev);
3690 if (mddev->pers == NULL) {
3691 strncpy(mddev->clevel, buf, slen);
3692 if (mddev->clevel[slen-1] == '\n')
3694 mddev->clevel[slen] = 0;
3695 mddev->level = LEVEL_NONE;
3703 /* request to change the personality. Need to ensure:
3704 * - array is not engaged in resync/recovery/reshape
3705 * - old personality can be suspended
3706 * - new personality will access other array.
3710 if (mddev->sync_thread ||
3711 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3712 mddev->reshape_position != MaxSector ||
3713 mddev->sysfs_active)
3717 if (!mddev->pers->quiesce) {
3718 pr_warn("md: %s: %s does not support online personality change\n",
3719 mdname(mddev), mddev->pers->name);
3723 /* Now find the new personality */
3724 strncpy(clevel, buf, slen);
3725 if (clevel[slen-1] == '\n')
3728 if (kstrtol(clevel, 10, &level))
3731 if (request_module("md-%s", clevel) != 0)
3732 request_module("md-level-%s", clevel);
3733 spin_lock(&pers_lock);
3734 pers = find_pers(level, clevel);
3735 if (!pers || !try_module_get(pers->owner)) {
3736 spin_unlock(&pers_lock);
3737 pr_warn("md: personality %s not loaded\n", clevel);
3741 spin_unlock(&pers_lock);
3743 if (pers == mddev->pers) {
3744 /* Nothing to do! */
3745 module_put(pers->owner);
3749 if (!pers->takeover) {
3750 module_put(pers->owner);
3751 pr_warn("md: %s: %s does not support personality takeover\n",
3752 mdname(mddev), clevel);
3757 rdev_for_each(rdev, mddev)
3758 rdev->new_raid_disk = rdev->raid_disk;
3760 /* ->takeover must set new_* and/or delta_disks
3761 * if it succeeds, and may set them when it fails.
3763 priv = pers->takeover(mddev);
3765 mddev->new_level = mddev->level;
3766 mddev->new_layout = mddev->layout;
3767 mddev->new_chunk_sectors = mddev->chunk_sectors;
3768 mddev->raid_disks -= mddev->delta_disks;
3769 mddev->delta_disks = 0;
3770 mddev->reshape_backwards = 0;
3771 module_put(pers->owner);
3772 pr_warn("md: %s: %s would not accept array\n",
3773 mdname(mddev), clevel);
3778 /* Looks like we have a winner */
3779 mddev_suspend(mddev);
3780 mddev_detach(mddev);
3782 spin_lock(&mddev->lock);
3783 oldpers = mddev->pers;
3784 oldpriv = mddev->private;
3786 mddev->private = priv;
3787 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3788 mddev->level = mddev->new_level;
3789 mddev->layout = mddev->new_layout;
3790 mddev->chunk_sectors = mddev->new_chunk_sectors;
3791 mddev->delta_disks = 0;
3792 mddev->reshape_backwards = 0;
3793 mddev->degraded = 0;
3794 spin_unlock(&mddev->lock);
3796 if (oldpers->sync_request == NULL &&
3798 /* We are converting from a no-redundancy array
3799 * to a redundancy array and metadata is managed
3800 * externally so we need to be sure that writes
3801 * won't block due to a need to transition
3803 * until external management is started.
3806 mddev->safemode_delay = 0;
3807 mddev->safemode = 0;
3810 oldpers->free(mddev, oldpriv);
3812 if (oldpers->sync_request == NULL &&
3813 pers->sync_request != NULL) {
3814 /* need to add the md_redundancy_group */
3815 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3816 pr_warn("md: cannot register extra attributes for %s\n",
3818 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3820 if (oldpers->sync_request != NULL &&
3821 pers->sync_request == NULL) {
3822 /* need to remove the md_redundancy_group */
3823 if (mddev->to_remove == NULL)
3824 mddev->to_remove = &md_redundancy_group;
3827 module_put(oldpers->owner);
3829 rdev_for_each(rdev, mddev) {
3830 if (rdev->raid_disk < 0)
3832 if (rdev->new_raid_disk >= mddev->raid_disks)
3833 rdev->new_raid_disk = -1;
3834 if (rdev->new_raid_disk == rdev->raid_disk)
3836 sysfs_unlink_rdev(mddev, rdev);
3838 rdev_for_each(rdev, mddev) {
3839 if (rdev->raid_disk < 0)
3841 if (rdev->new_raid_disk == rdev->raid_disk)
3843 rdev->raid_disk = rdev->new_raid_disk;
3844 if (rdev->raid_disk < 0)
3845 clear_bit(In_sync, &rdev->flags);
3847 if (sysfs_link_rdev(mddev, rdev))
3848 pr_warn("md: cannot register rd%d for %s after level change\n",
3849 rdev->raid_disk, mdname(mddev));
3853 if (pers->sync_request == NULL) {
3854 /* this is now an array without redundancy, so
3855 * it must always be in_sync
3858 del_timer_sync(&mddev->safemode_timer);
3860 blk_set_stacking_limits(&mddev->queue->limits);
3862 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3863 mddev_resume(mddev);
3865 md_update_sb(mddev, 1);
3866 sysfs_notify(&mddev->kobj, NULL, "level");
3867 md_new_event(mddev);
3870 mddev_unlock(mddev);
3874 static struct md_sysfs_entry md_level =
3875 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3878 layout_show(struct mddev *mddev, char *page)
3880 /* just a number, not meaningful for all levels */
3881 if (mddev->reshape_position != MaxSector &&
3882 mddev->layout != mddev->new_layout)
3883 return sprintf(page, "%d (%d)\n",
3884 mddev->new_layout, mddev->layout);
3885 return sprintf(page, "%d\n", mddev->layout);
3889 layout_store(struct mddev *mddev, const char *buf, size_t len)
3894 err = kstrtouint(buf, 10, &n);
3897 err = mddev_lock(mddev);
3902 if (mddev->pers->check_reshape == NULL)
3907 mddev->new_layout = n;
3908 err = mddev->pers->check_reshape(mddev);
3910 mddev->new_layout = mddev->layout;
3913 mddev->new_layout = n;
3914 if (mddev->reshape_position == MaxSector)
3917 mddev_unlock(mddev);
3920 static struct md_sysfs_entry md_layout =
3921 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3924 raid_disks_show(struct mddev *mddev, char *page)
3926 if (mddev->raid_disks == 0)
3928 if (mddev->reshape_position != MaxSector &&
3929 mddev->delta_disks != 0)
3930 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3931 mddev->raid_disks - mddev->delta_disks);
3932 return sprintf(page, "%d\n", mddev->raid_disks);
3935 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3938 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3943 err = kstrtouint(buf, 10, &n);
3947 err = mddev_lock(mddev);
3951 err = update_raid_disks(mddev, n);
3952 else if (mddev->reshape_position != MaxSector) {
3953 struct md_rdev *rdev;
3954 int olddisks = mddev->raid_disks - mddev->delta_disks;
3957 rdev_for_each(rdev, mddev) {
3959 rdev->data_offset < rdev->new_data_offset)
3962 rdev->data_offset > rdev->new_data_offset)
3966 mddev->delta_disks = n - olddisks;
3967 mddev->raid_disks = n;
3968 mddev->reshape_backwards = (mddev->delta_disks < 0);
3970 mddev->raid_disks = n;
3972 mddev_unlock(mddev);
3973 return err ? err : len;
3975 static struct md_sysfs_entry md_raid_disks =
3976 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3979 chunk_size_show(struct mddev *mddev, char *page)
3981 if (mddev->reshape_position != MaxSector &&
3982 mddev->chunk_sectors != mddev->new_chunk_sectors)
3983 return sprintf(page, "%d (%d)\n",
3984 mddev->new_chunk_sectors << 9,
3985 mddev->chunk_sectors << 9);
3986 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3990 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3995 err = kstrtoul(buf, 10, &n);
3999 err = mddev_lock(mddev);
4003 if (mddev->pers->check_reshape == NULL)
4008 mddev->new_chunk_sectors = n >> 9;
4009 err = mddev->pers->check_reshape(mddev);
4011 mddev->new_chunk_sectors = mddev->chunk_sectors;
4014 mddev->new_chunk_sectors = n >> 9;
4015 if (mddev->reshape_position == MaxSector)
4016 mddev->chunk_sectors = n >> 9;
4018 mddev_unlock(mddev);
4021 static struct md_sysfs_entry md_chunk_size =
4022 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4025 resync_start_show(struct mddev *mddev, char *page)
4027 if (mddev->recovery_cp == MaxSector)
4028 return sprintf(page, "none\n");
4029 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4033 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4035 unsigned long long n;
4038 if (cmd_match(buf, "none"))
4041 err = kstrtoull(buf, 10, &n);
4044 if (n != (sector_t)n)
4048 err = mddev_lock(mddev);
4051 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4055 mddev->recovery_cp = n;
4057 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4059 mddev_unlock(mddev);
4062 static struct md_sysfs_entry md_resync_start =
4063 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4064 resync_start_show, resync_start_store);
4067 * The array state can be:
4070 * No devices, no size, no level
4071 * Equivalent to STOP_ARRAY ioctl
4073 * May have some settings, but array is not active
4074 * all IO results in error
4075 * When written, doesn't tear down array, but just stops it
4076 * suspended (not supported yet)
4077 * All IO requests will block. The array can be reconfigured.
4078 * Writing this, if accepted, will block until array is quiescent
4080 * no resync can happen. no superblocks get written.
4081 * write requests fail
4083 * like readonly, but behaves like 'clean' on a write request.
4085 * clean - no pending writes, but otherwise active.
4086 * When written to inactive array, starts without resync
4087 * If a write request arrives then
4088 * if metadata is known, mark 'dirty' and switch to 'active'.
4089 * if not known, block and switch to write-pending
4090 * If written to an active array that has pending writes, then fails.
4092 * fully active: IO and resync can be happening.
4093 * When written to inactive array, starts with resync
4096 * clean, but writes are blocked waiting for 'active' to be written.
4099 * like active, but no writes have been seen for a while (100msec).
4102 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4103 write_pending, active_idle, bad_word};
4104 static char *array_states[] = {
4105 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4106 "write-pending", "active-idle", NULL };
4108 static int match_word(const char *word, char **list)
4111 for (n=0; list[n]; n++)
4112 if (cmd_match(word, list[n]))
4118 array_state_show(struct mddev *mddev, char *page)
4120 enum array_state st = inactive;
4131 spin_lock(&mddev->lock);
4132 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4134 else if (mddev->in_sync)
4136 else if (mddev->safemode)
4140 spin_unlock(&mddev->lock);
4143 if (list_empty(&mddev->disks) &&
4144 mddev->raid_disks == 0 &&
4145 mddev->dev_sectors == 0)
4150 return sprintf(page, "%s\n", array_states[st]);
4153 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4154 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4155 static int do_md_run(struct mddev *mddev);
4156 static int restart_array(struct mddev *mddev);
4159 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4162 enum array_state st = match_word(buf, array_states);
4164 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4165 /* don't take reconfig_mutex when toggling between
4168 spin_lock(&mddev->lock);
4170 restart_array(mddev);
4171 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4172 md_wakeup_thread(mddev->thread);
4173 wake_up(&mddev->sb_wait);
4174 } else /* st == clean */ {
4175 restart_array(mddev);
4176 if (!set_in_sync(mddev))
4180 sysfs_notify_dirent_safe(mddev->sysfs_state);
4181 spin_unlock(&mddev->lock);
4184 err = mddev_lock(mddev);
4192 /* stopping an active array */
4193 err = do_md_stop(mddev, 0, NULL);
4196 /* stopping an active array */
4198 err = do_md_stop(mddev, 2, NULL);
4200 err = 0; /* already inactive */
4203 break; /* not supported yet */
4206 err = md_set_readonly(mddev, NULL);
4209 set_disk_ro(mddev->gendisk, 1);
4210 err = do_md_run(mddev);
4216 err = md_set_readonly(mddev, NULL);
4217 else if (mddev->ro == 1)
4218 err = restart_array(mddev);
4221 set_disk_ro(mddev->gendisk, 0);
4225 err = do_md_run(mddev);
4230 err = restart_array(mddev);
4233 spin_lock(&mddev->lock);
4234 if (!set_in_sync(mddev))
4236 spin_unlock(&mddev->lock);
4242 err = restart_array(mddev);
4245 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4246 wake_up(&mddev->sb_wait);
4250 set_disk_ro(mddev->gendisk, 0);
4251 err = do_md_run(mddev);
4256 /* these cannot be set */
4261 if (mddev->hold_active == UNTIL_IOCTL)
4262 mddev->hold_active = 0;
4263 sysfs_notify_dirent_safe(mddev->sysfs_state);
4265 mddev_unlock(mddev);
4268 static struct md_sysfs_entry md_array_state =
4269 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4272 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4273 return sprintf(page, "%d\n",
4274 atomic_read(&mddev->max_corr_read_errors));
4278 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4283 rv = kstrtouint(buf, 10, &n);
4286 atomic_set(&mddev->max_corr_read_errors, n);
4290 static struct md_sysfs_entry max_corr_read_errors =
4291 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4292 max_corrected_read_errors_store);
4295 null_show(struct mddev *mddev, char *page)
4301 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4303 /* buf must be %d:%d\n? giving major and minor numbers */
4304 /* The new device is added to the array.
4305 * If the array has a persistent superblock, we read the
4306 * superblock to initialise info and check validity.
4307 * Otherwise, only checking done is that in bind_rdev_to_array,
4308 * which mainly checks size.
4311 int major = simple_strtoul(buf, &e, 10);
4314 struct md_rdev *rdev;
4317 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4319 minor = simple_strtoul(e+1, &e, 10);
4320 if (*e && *e != '\n')
4322 dev = MKDEV(major, minor);
4323 if (major != MAJOR(dev) ||
4324 minor != MINOR(dev))
4327 flush_workqueue(md_misc_wq);
4329 err = mddev_lock(mddev);
4332 if (mddev->persistent) {
4333 rdev = md_import_device(dev, mddev->major_version,
4334 mddev->minor_version);
4335 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4336 struct md_rdev *rdev0
4337 = list_entry(mddev->disks.next,
4338 struct md_rdev, same_set);
4339 err = super_types[mddev->major_version]
4340 .load_super(rdev, rdev0, mddev->minor_version);
4344 } else if (mddev->external)
4345 rdev = md_import_device(dev, -2, -1);
4347 rdev = md_import_device(dev, -1, -1);
4350 mddev_unlock(mddev);
4351 return PTR_ERR(rdev);
4353 err = bind_rdev_to_array(rdev, mddev);
4357 mddev_unlock(mddev);
4359 md_new_event(mddev);
4360 return err ? err : len;
4363 static struct md_sysfs_entry md_new_device =
4364 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4367 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4370 unsigned long chunk, end_chunk;
4373 err = mddev_lock(mddev);
4378 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4380 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4381 if (buf == end) break;
4382 if (*end == '-') { /* range */
4384 end_chunk = simple_strtoul(buf, &end, 0);
4385 if (buf == end) break;
4387 if (*end && !isspace(*end)) break;
4388 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4389 buf = skip_spaces(end);
4391 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4393 mddev_unlock(mddev);
4397 static struct md_sysfs_entry md_bitmap =
4398 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4401 size_show(struct mddev *mddev, char *page)
4403 return sprintf(page, "%llu\n",
4404 (unsigned long long)mddev->dev_sectors / 2);
4407 static int update_size(struct mddev *mddev, sector_t num_sectors);
4410 size_store(struct mddev *mddev, const char *buf, size_t len)
4412 /* If array is inactive, we can reduce the component size, but
4413 * not increase it (except from 0).
4414 * If array is active, we can try an on-line resize
4417 int err = strict_blocks_to_sectors(buf, §ors);
4421 err = mddev_lock(mddev);
4425 err = update_size(mddev, sectors);
4427 md_update_sb(mddev, 1);
4429 if (mddev->dev_sectors == 0 ||
4430 mddev->dev_sectors > sectors)
4431 mddev->dev_sectors = sectors;
4435 mddev_unlock(mddev);
4436 return err ? err : len;
4439 static struct md_sysfs_entry md_size =
4440 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4442 /* Metadata version.
4444 * 'none' for arrays with no metadata (good luck...)
4445 * 'external' for arrays with externally managed metadata,
4446 * or N.M for internally known formats
4449 metadata_show(struct mddev *mddev, char *page)
4451 if (mddev->persistent)
4452 return sprintf(page, "%d.%d\n",
4453 mddev->major_version, mddev->minor_version);
4454 else if (mddev->external)
4455 return sprintf(page, "external:%s\n", mddev->metadata_type);
4457 return sprintf(page, "none\n");
4461 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4466 /* Changing the details of 'external' metadata is
4467 * always permitted. Otherwise there must be
4468 * no devices attached to the array.
4471 err = mddev_lock(mddev);
4475 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4477 else if (!list_empty(&mddev->disks))
4481 if (cmd_match(buf, "none")) {
4482 mddev->persistent = 0;
4483 mddev->external = 0;
4484 mddev->major_version = 0;
4485 mddev->minor_version = 90;
4488 if (strncmp(buf, "external:", 9) == 0) {
4489 size_t namelen = len-9;
4490 if (namelen >= sizeof(mddev->metadata_type))
4491 namelen = sizeof(mddev->metadata_type)-1;
4492 strncpy(mddev->metadata_type, buf+9, namelen);
4493 mddev->metadata_type[namelen] = 0;
4494 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4495 mddev->metadata_type[--namelen] = 0;
4496 mddev->persistent = 0;
4497 mddev->external = 1;
4498 mddev->major_version = 0;
4499 mddev->minor_version = 90;
4502 major = simple_strtoul(buf, &e, 10);
4504 if (e==buf || *e != '.')
4507 minor = simple_strtoul(buf, &e, 10);
4508 if (e==buf || (*e && *e != '\n') )
4511 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4513 mddev->major_version = major;
4514 mddev->minor_version = minor;
4515 mddev->persistent = 1;
4516 mddev->external = 0;
4519 mddev_unlock(mddev);
4523 static struct md_sysfs_entry md_metadata =
4524 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4527 action_show(struct mddev *mddev, char *page)
4529 char *type = "idle";
4530 unsigned long recovery = mddev->recovery;
4531 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4533 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4534 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4535 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4537 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4538 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4540 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4544 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4546 else if (mddev->reshape_position != MaxSector)
4549 return sprintf(page, "%s\n", type);
4553 action_store(struct mddev *mddev, const char *page, size_t len)
4555 if (!mddev->pers || !mddev->pers->sync_request)
4559 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4560 if (cmd_match(page, "frozen"))
4561 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4563 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4564 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4565 mddev_lock(mddev) == 0) {
4566 flush_workqueue(md_misc_wq);
4567 if (mddev->sync_thread) {
4568 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4569 md_reap_sync_thread(mddev);
4571 mddev_unlock(mddev);
4573 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4575 else if (cmd_match(page, "resync"))
4576 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4577 else if (cmd_match(page, "recover")) {
4578 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4579 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4580 } else if (cmd_match(page, "reshape")) {
4582 if (mddev->pers->start_reshape == NULL)
4584 err = mddev_lock(mddev);
4586 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4589 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4590 err = mddev->pers->start_reshape(mddev);
4592 mddev_unlock(mddev);
4596 sysfs_notify(&mddev->kobj, NULL, "degraded");
4598 if (cmd_match(page, "check"))
4599 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4600 else if (!cmd_match(page, "repair"))
4602 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4603 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4604 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4606 if (mddev->ro == 2) {
4607 /* A write to sync_action is enough to justify
4608 * canceling read-auto mode
4611 md_wakeup_thread(mddev->sync_thread);
4613 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4614 md_wakeup_thread(mddev->thread);
4615 sysfs_notify_dirent_safe(mddev->sysfs_action);
4619 static struct md_sysfs_entry md_scan_mode =
4620 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4623 last_sync_action_show(struct mddev *mddev, char *page)
4625 return sprintf(page, "%s\n", mddev->last_sync_action);
4628 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4631 mismatch_cnt_show(struct mddev *mddev, char *page)
4633 return sprintf(page, "%llu\n",
4634 (unsigned long long)
4635 atomic64_read(&mddev->resync_mismatches));
4638 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4641 sync_min_show(struct mddev *mddev, char *page)
4643 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4644 mddev->sync_speed_min ? "local": "system");
4648 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4653 if (strncmp(buf, "system", 6)==0) {
4656 rv = kstrtouint(buf, 10, &min);
4662 mddev->sync_speed_min = min;
4666 static struct md_sysfs_entry md_sync_min =
4667 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4670 sync_max_show(struct mddev *mddev, char *page)
4672 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4673 mddev->sync_speed_max ? "local": "system");
4677 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4682 if (strncmp(buf, "system", 6)==0) {
4685 rv = kstrtouint(buf, 10, &max);
4691 mddev->sync_speed_max = max;
4695 static struct md_sysfs_entry md_sync_max =
4696 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4699 degraded_show(struct mddev *mddev, char *page)
4701 return sprintf(page, "%d\n", mddev->degraded);
4703 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4706 sync_force_parallel_show(struct mddev *mddev, char *page)
4708 return sprintf(page, "%d\n", mddev->parallel_resync);
4712 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4716 if (kstrtol(buf, 10, &n))
4719 if (n != 0 && n != 1)
4722 mddev->parallel_resync = n;
4724 if (mddev->sync_thread)
4725 wake_up(&resync_wait);
4730 /* force parallel resync, even with shared block devices */
4731 static struct md_sysfs_entry md_sync_force_parallel =
4732 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4733 sync_force_parallel_show, sync_force_parallel_store);
4736 sync_speed_show(struct mddev *mddev, char *page)
4738 unsigned long resync, dt, db;
4739 if (mddev->curr_resync == 0)
4740 return sprintf(page, "none\n");
4741 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4742 dt = (jiffies - mddev->resync_mark) / HZ;
4744 db = resync - mddev->resync_mark_cnt;
4745 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4748 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4751 sync_completed_show(struct mddev *mddev, char *page)
4753 unsigned long long max_sectors, resync;
4755 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4756 return sprintf(page, "none\n");
4758 if (mddev->curr_resync == 1 ||
4759 mddev->curr_resync == 2)
4760 return sprintf(page, "delayed\n");
4762 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4763 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4764 max_sectors = mddev->resync_max_sectors;
4766 max_sectors = mddev->dev_sectors;
4768 resync = mddev->curr_resync_completed;
4769 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4772 static struct md_sysfs_entry md_sync_completed =
4773 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4776 min_sync_show(struct mddev *mddev, char *page)
4778 return sprintf(page, "%llu\n",
4779 (unsigned long long)mddev->resync_min);
4782 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4784 unsigned long long min;
4787 if (kstrtoull(buf, 10, &min))
4790 spin_lock(&mddev->lock);
4792 if (min > mddev->resync_max)
4796 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4799 /* Round down to multiple of 4K for safety */
4800 mddev->resync_min = round_down(min, 8);
4804 spin_unlock(&mddev->lock);
4808 static struct md_sysfs_entry md_min_sync =
4809 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4812 max_sync_show(struct mddev *mddev, char *page)
4814 if (mddev->resync_max == MaxSector)
4815 return sprintf(page, "max\n");
4817 return sprintf(page, "%llu\n",
4818 (unsigned long long)mddev->resync_max);
4821 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4824 spin_lock(&mddev->lock);
4825 if (strncmp(buf, "max", 3) == 0)
4826 mddev->resync_max = MaxSector;
4828 unsigned long long max;
4832 if (kstrtoull(buf, 10, &max))
4834 if (max < mddev->resync_min)
4838 if (max < mddev->resync_max &&
4840 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4843 /* Must be a multiple of chunk_size */
4844 chunk = mddev->chunk_sectors;
4846 sector_t temp = max;
4849 if (sector_div(temp, chunk))
4852 mddev->resync_max = max;
4854 wake_up(&mddev->recovery_wait);
4857 spin_unlock(&mddev->lock);
4861 static struct md_sysfs_entry md_max_sync =
4862 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4865 suspend_lo_show(struct mddev *mddev, char *page)
4867 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4871 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4873 unsigned long long new;
4876 err = kstrtoull(buf, 10, &new);
4879 if (new != (sector_t)new)
4882 err = mddev_lock(mddev);
4886 if (mddev->pers == NULL ||
4887 mddev->pers->quiesce == NULL)
4889 mddev_suspend(mddev);
4890 mddev->suspend_lo = new;
4891 mddev_resume(mddev);
4895 mddev_unlock(mddev);
4898 static struct md_sysfs_entry md_suspend_lo =
4899 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4902 suspend_hi_show(struct mddev *mddev, char *page)
4904 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4908 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4910 unsigned long long new;
4913 err = kstrtoull(buf, 10, &new);
4916 if (new != (sector_t)new)
4919 err = mddev_lock(mddev);
4923 if (mddev->pers == NULL)
4926 mddev_suspend(mddev);
4927 mddev->suspend_hi = new;
4928 mddev_resume(mddev);
4932 mddev_unlock(mddev);
4935 static struct md_sysfs_entry md_suspend_hi =
4936 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4939 reshape_position_show(struct mddev *mddev, char *page)
4941 if (mddev->reshape_position != MaxSector)
4942 return sprintf(page, "%llu\n",
4943 (unsigned long long)mddev->reshape_position);
4944 strcpy(page, "none\n");
4949 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4951 struct md_rdev *rdev;
4952 unsigned long long new;
4955 err = kstrtoull(buf, 10, &new);
4958 if (new != (sector_t)new)
4960 err = mddev_lock(mddev);
4966 mddev->reshape_position = new;
4967 mddev->delta_disks = 0;
4968 mddev->reshape_backwards = 0;
4969 mddev->new_level = mddev->level;
4970 mddev->new_layout = mddev->layout;
4971 mddev->new_chunk_sectors = mddev->chunk_sectors;
4972 rdev_for_each(rdev, mddev)
4973 rdev->new_data_offset = rdev->data_offset;
4976 mddev_unlock(mddev);
4980 static struct md_sysfs_entry md_reshape_position =
4981 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4982 reshape_position_store);
4985 reshape_direction_show(struct mddev *mddev, char *page)
4987 return sprintf(page, "%s\n",
4988 mddev->reshape_backwards ? "backwards" : "forwards");
4992 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4997 if (cmd_match(buf, "forwards"))
4999 else if (cmd_match(buf, "backwards"))
5003 if (mddev->reshape_backwards == backwards)
5006 err = mddev_lock(mddev);
5009 /* check if we are allowed to change */
5010 if (mddev->delta_disks)
5012 else if (mddev->persistent &&
5013 mddev->major_version == 0)
5016 mddev->reshape_backwards = backwards;
5017 mddev_unlock(mddev);
5021 static struct md_sysfs_entry md_reshape_direction =
5022 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5023 reshape_direction_store);
5026 array_size_show(struct mddev *mddev, char *page)
5028 if (mddev->external_size)
5029 return sprintf(page, "%llu\n",
5030 (unsigned long long)mddev->array_sectors/2);
5032 return sprintf(page, "default\n");
5036 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5041 err = mddev_lock(mddev);
5045 /* cluster raid doesn't support change array_sectors */
5046 if (mddev_is_clustered(mddev)) {
5047 mddev_unlock(mddev);
5051 if (strncmp(buf, "default", 7) == 0) {
5053 sectors = mddev->pers->size(mddev, 0, 0);
5055 sectors = mddev->array_sectors;
5057 mddev->external_size = 0;
5059 if (strict_blocks_to_sectors(buf, §ors) < 0)
5061 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5064 mddev->external_size = 1;
5068 mddev->array_sectors = sectors;
5070 set_capacity(mddev->gendisk, mddev->array_sectors);
5071 revalidate_disk(mddev->gendisk);
5074 mddev_unlock(mddev);
5078 static struct md_sysfs_entry md_array_size =
5079 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5083 consistency_policy_show(struct mddev *mddev, char *page)
5087 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5088 ret = sprintf(page, "journal\n");
5089 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5090 ret = sprintf(page, "ppl\n");
5091 } else if (mddev->bitmap) {
5092 ret = sprintf(page, "bitmap\n");
5093 } else if (mddev->pers) {
5094 if (mddev->pers->sync_request)
5095 ret = sprintf(page, "resync\n");
5097 ret = sprintf(page, "none\n");
5099 ret = sprintf(page, "unknown\n");
5106 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5111 if (mddev->pers->change_consistency_policy)
5112 err = mddev->pers->change_consistency_policy(mddev, buf);
5115 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5116 set_bit(MD_HAS_PPL, &mddev->flags);
5121 return err ? err : len;
5124 static struct md_sysfs_entry md_consistency_policy =
5125 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5126 consistency_policy_store);
5128 static struct attribute *md_default_attrs[] = {
5131 &md_raid_disks.attr,
5132 &md_chunk_size.attr,
5134 &md_resync_start.attr,
5136 &md_new_device.attr,
5137 &md_safe_delay.attr,
5138 &md_array_state.attr,
5139 &md_reshape_position.attr,
5140 &md_reshape_direction.attr,
5141 &md_array_size.attr,
5142 &max_corr_read_errors.attr,
5143 &md_consistency_policy.attr,
5147 static struct attribute *md_redundancy_attrs[] = {
5149 &md_last_scan_mode.attr,
5150 &md_mismatches.attr,
5153 &md_sync_speed.attr,
5154 &md_sync_force_parallel.attr,
5155 &md_sync_completed.attr,
5158 &md_suspend_lo.attr,
5159 &md_suspend_hi.attr,
5164 static struct attribute_group md_redundancy_group = {
5166 .attrs = md_redundancy_attrs,
5170 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5172 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5173 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5178 spin_lock(&all_mddevs_lock);
5179 if (list_empty(&mddev->all_mddevs)) {
5180 spin_unlock(&all_mddevs_lock);
5184 spin_unlock(&all_mddevs_lock);
5186 rv = entry->show(mddev, page);
5192 md_attr_store(struct kobject *kobj, struct attribute *attr,
5193 const char *page, size_t length)
5195 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5196 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5201 if (!capable(CAP_SYS_ADMIN))
5203 spin_lock(&all_mddevs_lock);
5204 if (list_empty(&mddev->all_mddevs)) {
5205 spin_unlock(&all_mddevs_lock);
5209 spin_unlock(&all_mddevs_lock);
5210 rv = entry->store(mddev, page, length);
5215 static void md_free(struct kobject *ko)
5217 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5219 if (mddev->sysfs_state)
5220 sysfs_put(mddev->sysfs_state);
5223 del_gendisk(mddev->gendisk);
5225 blk_cleanup_queue(mddev->queue);
5227 put_disk(mddev->gendisk);
5228 percpu_ref_exit(&mddev->writes_pending);
5230 bioset_exit(&mddev->bio_set);
5231 bioset_exit(&mddev->sync_set);
5235 static const struct sysfs_ops md_sysfs_ops = {
5236 .show = md_attr_show,
5237 .store = md_attr_store,
5239 static struct kobj_type md_ktype = {
5241 .sysfs_ops = &md_sysfs_ops,
5242 .default_attrs = md_default_attrs,
5247 static void mddev_delayed_delete(struct work_struct *ws)
5249 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5251 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5252 kobject_del(&mddev->kobj);
5253 kobject_put(&mddev->kobj);
5256 static void no_op(struct percpu_ref *r) {}
5258 int mddev_init_writes_pending(struct mddev *mddev)
5260 if (mddev->writes_pending.percpu_count_ptr)
5262 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5264 /* We want to start with the refcount at zero */
5265 percpu_ref_put(&mddev->writes_pending);
5268 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5270 static int md_alloc(dev_t dev, char *name)
5273 * If dev is zero, name is the name of a device to allocate with
5274 * an arbitrary minor number. It will be "md_???"
5275 * If dev is non-zero it must be a device number with a MAJOR of
5276 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5277 * the device is being created by opening a node in /dev.
5278 * If "name" is not NULL, the device is being created by
5279 * writing to /sys/module/md_mod/parameters/new_array.
5281 static DEFINE_MUTEX(disks_mutex);
5282 struct mddev *mddev = mddev_find(dev);
5283 struct gendisk *disk;
5292 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5293 shift = partitioned ? MdpMinorShift : 0;
5294 unit = MINOR(mddev->unit) >> shift;
5296 /* wait for any previous instance of this device to be
5297 * completely removed (mddev_delayed_delete).
5299 flush_workqueue(md_misc_wq);
5301 mutex_lock(&disks_mutex);
5307 /* Need to ensure that 'name' is not a duplicate.
5309 struct mddev *mddev2;
5310 spin_lock(&all_mddevs_lock);
5312 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5313 if (mddev2->gendisk &&
5314 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5315 spin_unlock(&all_mddevs_lock);
5318 spin_unlock(&all_mddevs_lock);
5322 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5324 mddev->hold_active = UNTIL_STOP;
5327 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5330 mddev->queue->queuedata = mddev;
5332 blk_queue_make_request(mddev->queue, md_make_request);
5333 blk_set_stacking_limits(&mddev->queue->limits);
5335 disk = alloc_disk(1 << shift);
5337 blk_cleanup_queue(mddev->queue);
5338 mddev->queue = NULL;
5341 disk->major = MAJOR(mddev->unit);
5342 disk->first_minor = unit << shift;
5344 strcpy(disk->disk_name, name);
5345 else if (partitioned)
5346 sprintf(disk->disk_name, "md_d%d", unit);
5348 sprintf(disk->disk_name, "md%d", unit);
5349 disk->fops = &md_fops;
5350 disk->private_data = mddev;
5351 disk->queue = mddev->queue;
5352 blk_queue_write_cache(mddev->queue, true, true);
5353 /* Allow extended partitions. This makes the
5354 * 'mdp' device redundant, but we can't really
5357 disk->flags |= GENHD_FL_EXT_DEVT;
5358 mddev->gendisk = disk;
5359 /* As soon as we call add_disk(), another thread could get
5360 * through to md_open, so make sure it doesn't get too far
5362 mutex_lock(&mddev->open_mutex);
5365 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5367 /* This isn't possible, but as kobject_init_and_add is marked
5368 * __must_check, we must do something with the result
5370 pr_debug("md: cannot register %s/md - name in use\n",
5374 if (mddev->kobj.sd &&
5375 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5376 pr_debug("pointless warning\n");
5377 mutex_unlock(&mddev->open_mutex);
5379 mutex_unlock(&disks_mutex);
5380 if (!error && mddev->kobj.sd) {
5381 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5382 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5388 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5391 md_alloc(dev, NULL);
5395 static int add_named_array(const char *val, const struct kernel_param *kp)
5398 * val must be "md_*" or "mdNNN".
5399 * For "md_*" we allocate an array with a large free minor number, and
5400 * set the name to val. val must not already be an active name.
5401 * For "mdNNN" we allocate an array with the minor number NNN
5402 * which must not already be in use.
5404 int len = strlen(val);
5405 char buf[DISK_NAME_LEN];
5406 unsigned long devnum;
5408 while (len && val[len-1] == '\n')
5410 if (len >= DISK_NAME_LEN)
5412 strlcpy(buf, val, len+1);
5413 if (strncmp(buf, "md_", 3) == 0)
5414 return md_alloc(0, buf);
5415 if (strncmp(buf, "md", 2) == 0 &&
5417 kstrtoul(buf+2, 10, &devnum) == 0 &&
5418 devnum <= MINORMASK)
5419 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5424 static void md_safemode_timeout(struct timer_list *t)
5426 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5428 mddev->safemode = 1;
5429 if (mddev->external)
5430 sysfs_notify_dirent_safe(mddev->sysfs_state);
5432 md_wakeup_thread(mddev->thread);
5435 static int start_dirty_degraded;
5437 int md_run(struct mddev *mddev)
5440 struct md_rdev *rdev;
5441 struct md_personality *pers;
5443 if (list_empty(&mddev->disks))
5444 /* cannot run an array with no devices.. */
5449 /* Cannot run until previous stop completes properly */
5450 if (mddev->sysfs_active)
5454 * Analyze all RAID superblock(s)
5456 if (!mddev->raid_disks) {
5457 if (!mddev->persistent)
5462 if (mddev->level != LEVEL_NONE)
5463 request_module("md-level-%d", mddev->level);
5464 else if (mddev->clevel[0])
5465 request_module("md-%s", mddev->clevel);
5468 * Drop all container device buffers, from now on
5469 * the only valid external interface is through the md
5472 mddev->has_superblocks = false;
5473 rdev_for_each(rdev, mddev) {
5474 if (test_bit(Faulty, &rdev->flags))
5476 sync_blockdev(rdev->bdev);
5477 invalidate_bdev(rdev->bdev);
5478 if (mddev->ro != 1 &&
5479 (bdev_read_only(rdev->bdev) ||
5480 bdev_read_only(rdev->meta_bdev))) {
5483 set_disk_ro(mddev->gendisk, 1);
5487 mddev->has_superblocks = true;
5489 /* perform some consistency tests on the device.
5490 * We don't want the data to overlap the metadata,
5491 * Internal Bitmap issues have been handled elsewhere.
5493 if (rdev->meta_bdev) {
5494 /* Nothing to check */;
5495 } else if (rdev->data_offset < rdev->sb_start) {
5496 if (mddev->dev_sectors &&
5497 rdev->data_offset + mddev->dev_sectors
5499 pr_warn("md: %s: data overlaps metadata\n",
5504 if (rdev->sb_start + rdev->sb_size/512
5505 > rdev->data_offset) {
5506 pr_warn("md: %s: metadata overlaps data\n",
5511 sysfs_notify_dirent_safe(rdev->sysfs_state);
5514 if (!bioset_initialized(&mddev->bio_set)) {
5515 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5519 if (!bioset_initialized(&mddev->sync_set)) {
5520 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5524 if (mddev->flush_pool == NULL) {
5525 mddev->flush_pool = mempool_create(NR_FLUSH_INFOS, flush_info_alloc,
5526 flush_info_free, mddev);
5527 if (!mddev->flush_pool) {
5532 if (mddev->flush_bio_pool == NULL) {
5533 mddev->flush_bio_pool = mempool_create(NR_FLUSH_BIOS, flush_bio_alloc,
5534 flush_bio_free, mddev);
5535 if (!mddev->flush_bio_pool) {
5541 spin_lock(&pers_lock);
5542 pers = find_pers(mddev->level, mddev->clevel);
5543 if (!pers || !try_module_get(pers->owner)) {
5544 spin_unlock(&pers_lock);
5545 if (mddev->level != LEVEL_NONE)
5546 pr_warn("md: personality for level %d is not loaded!\n",
5549 pr_warn("md: personality for level %s is not loaded!\n",
5554 spin_unlock(&pers_lock);
5555 if (mddev->level != pers->level) {
5556 mddev->level = pers->level;
5557 mddev->new_level = pers->level;
5559 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5561 if (mddev->reshape_position != MaxSector &&
5562 pers->start_reshape == NULL) {
5563 /* This personality cannot handle reshaping... */
5564 module_put(pers->owner);
5569 if (pers->sync_request) {
5570 /* Warn if this is a potentially silly
5573 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5574 struct md_rdev *rdev2;
5577 rdev_for_each(rdev, mddev)
5578 rdev_for_each(rdev2, mddev) {
5580 rdev->bdev->bd_contains ==
5581 rdev2->bdev->bd_contains) {
5582 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5584 bdevname(rdev->bdev,b),
5585 bdevname(rdev2->bdev,b2));
5591 pr_warn("True protection against single-disk failure might be compromised.\n");
5594 mddev->recovery = 0;
5595 /* may be over-ridden by personality */
5596 mddev->resync_max_sectors = mddev->dev_sectors;
5598 mddev->ok_start_degraded = start_dirty_degraded;
5600 if (start_readonly && mddev->ro == 0)
5601 mddev->ro = 2; /* read-only, but switch on first write */
5603 err = pers->run(mddev);
5605 pr_warn("md: pers->run() failed ...\n");
5606 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5607 WARN_ONCE(!mddev->external_size,
5608 "%s: default size too small, but 'external_size' not in effect?\n",
5610 pr_warn("md: invalid array_size %llu > default size %llu\n",
5611 (unsigned long long)mddev->array_sectors / 2,
5612 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5615 if (err == 0 && pers->sync_request &&
5616 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5617 struct bitmap *bitmap;
5619 bitmap = md_bitmap_create(mddev, -1);
5620 if (IS_ERR(bitmap)) {
5621 err = PTR_ERR(bitmap);
5622 pr_warn("%s: failed to create bitmap (%d)\n",
5623 mdname(mddev), err);
5625 mddev->bitmap = bitmap;
5629 mddev_detach(mddev);
5631 pers->free(mddev, mddev->private);
5632 mddev->private = NULL;
5633 module_put(pers->owner);
5634 md_bitmap_destroy(mddev);
5640 rdev_for_each(rdev, mddev) {
5641 if (rdev->raid_disk >= 0 &&
5642 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5647 if (mddev->degraded)
5650 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5652 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5653 mddev->queue->backing_dev_info->congested_data = mddev;
5654 mddev->queue->backing_dev_info->congested_fn = md_congested;
5656 if (pers->sync_request) {
5657 if (mddev->kobj.sd &&
5658 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5659 pr_warn("md: cannot register extra attributes for %s\n",
5661 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5662 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5665 atomic_set(&mddev->max_corr_read_errors,
5666 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5667 mddev->safemode = 0;
5668 if (mddev_is_clustered(mddev))
5669 mddev->safemode_delay = 0;
5671 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5674 spin_lock(&mddev->lock);
5676 spin_unlock(&mddev->lock);
5677 rdev_for_each(rdev, mddev)
5678 if (rdev->raid_disk >= 0)
5679 if (sysfs_link_rdev(mddev, rdev))
5680 /* failure here is OK */;
5682 if (mddev->degraded && !mddev->ro)
5683 /* This ensures that recovering status is reported immediately
5684 * via sysfs - until a lack of spares is confirmed.
5686 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5687 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5689 if (mddev->sb_flags)
5690 md_update_sb(mddev, 0);
5692 md_new_event(mddev);
5693 sysfs_notify_dirent_safe(mddev->sysfs_state);
5694 sysfs_notify_dirent_safe(mddev->sysfs_action);
5695 sysfs_notify(&mddev->kobj, NULL, "degraded");
5699 if (mddev->flush_bio_pool) {
5700 mempool_destroy(mddev->flush_bio_pool);
5701 mddev->flush_bio_pool = NULL;
5703 if (mddev->flush_pool){
5704 mempool_destroy(mddev->flush_pool);
5705 mddev->flush_pool = NULL;
5710 EXPORT_SYMBOL_GPL(md_run);
5712 static int do_md_run(struct mddev *mddev)
5716 err = md_run(mddev);
5719 err = md_bitmap_load(mddev);
5721 md_bitmap_destroy(mddev);
5725 if (mddev_is_clustered(mddev))
5726 md_allow_write(mddev);
5728 /* run start up tasks that require md_thread */
5731 md_wakeup_thread(mddev->thread);
5732 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5734 set_capacity(mddev->gendisk, mddev->array_sectors);
5735 revalidate_disk(mddev->gendisk);
5737 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5742 int md_start(struct mddev *mddev)
5746 if (mddev->pers->start) {
5747 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5748 md_wakeup_thread(mddev->thread);
5749 ret = mddev->pers->start(mddev);
5750 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5751 md_wakeup_thread(mddev->sync_thread);
5755 EXPORT_SYMBOL_GPL(md_start);
5757 static int restart_array(struct mddev *mddev)
5759 struct gendisk *disk = mddev->gendisk;
5760 struct md_rdev *rdev;
5761 bool has_journal = false;
5762 bool has_readonly = false;
5764 /* Complain if it has no devices */
5765 if (list_empty(&mddev->disks))
5773 rdev_for_each_rcu(rdev, mddev) {
5774 if (test_bit(Journal, &rdev->flags) &&
5775 !test_bit(Faulty, &rdev->flags))
5777 if (bdev_read_only(rdev->bdev))
5778 has_readonly = true;
5781 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5782 /* Don't restart rw with journal missing/faulty */
5787 mddev->safemode = 0;
5789 set_disk_ro(disk, 0);
5790 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5791 /* Kick recovery or resync if necessary */
5792 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5793 md_wakeup_thread(mddev->thread);
5794 md_wakeup_thread(mddev->sync_thread);
5795 sysfs_notify_dirent_safe(mddev->sysfs_state);
5799 static void md_clean(struct mddev *mddev)
5801 mddev->array_sectors = 0;
5802 mddev->external_size = 0;
5803 mddev->dev_sectors = 0;
5804 mddev->raid_disks = 0;
5805 mddev->recovery_cp = 0;
5806 mddev->resync_min = 0;
5807 mddev->resync_max = MaxSector;
5808 mddev->reshape_position = MaxSector;
5809 mddev->external = 0;
5810 mddev->persistent = 0;
5811 mddev->level = LEVEL_NONE;
5812 mddev->clevel[0] = 0;
5814 mddev->sb_flags = 0;
5816 mddev->metadata_type[0] = 0;
5817 mddev->chunk_sectors = 0;
5818 mddev->ctime = mddev->utime = 0;
5820 mddev->max_disks = 0;
5822 mddev->can_decrease_events = 0;
5823 mddev->delta_disks = 0;
5824 mddev->reshape_backwards = 0;
5825 mddev->new_level = LEVEL_NONE;
5826 mddev->new_layout = 0;
5827 mddev->new_chunk_sectors = 0;
5828 mddev->curr_resync = 0;
5829 atomic64_set(&mddev->resync_mismatches, 0);
5830 mddev->suspend_lo = mddev->suspend_hi = 0;
5831 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5832 mddev->recovery = 0;
5835 mddev->degraded = 0;
5836 mddev->safemode = 0;
5837 mddev->private = NULL;
5838 mddev->cluster_info = NULL;
5839 mddev->bitmap_info.offset = 0;
5840 mddev->bitmap_info.default_offset = 0;
5841 mddev->bitmap_info.default_space = 0;
5842 mddev->bitmap_info.chunksize = 0;
5843 mddev->bitmap_info.daemon_sleep = 0;
5844 mddev->bitmap_info.max_write_behind = 0;
5845 mddev->bitmap_info.nodes = 0;
5848 static void __md_stop_writes(struct mddev *mddev)
5850 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5851 flush_workqueue(md_misc_wq);
5852 if (mddev->sync_thread) {
5853 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5854 md_reap_sync_thread(mddev);
5857 del_timer_sync(&mddev->safemode_timer);
5859 if (mddev->pers && mddev->pers->quiesce) {
5860 mddev->pers->quiesce(mddev, 1);
5861 mddev->pers->quiesce(mddev, 0);
5863 md_bitmap_flush(mddev);
5865 if (mddev->ro == 0 &&
5866 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5868 /* mark array as shutdown cleanly */
5869 if (!mddev_is_clustered(mddev))
5871 md_update_sb(mddev, 1);
5875 void md_stop_writes(struct mddev *mddev)
5877 mddev_lock_nointr(mddev);
5878 __md_stop_writes(mddev);
5879 mddev_unlock(mddev);
5881 EXPORT_SYMBOL_GPL(md_stop_writes);
5883 static void mddev_detach(struct mddev *mddev)
5885 md_bitmap_wait_behind_writes(mddev);
5886 if (mddev->pers && mddev->pers->quiesce) {
5887 mddev->pers->quiesce(mddev, 1);
5888 mddev->pers->quiesce(mddev, 0);
5890 md_unregister_thread(&mddev->thread);
5892 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5895 static void __md_stop(struct mddev *mddev)
5897 struct md_personality *pers = mddev->pers;
5898 md_bitmap_destroy(mddev);
5899 mddev_detach(mddev);
5900 /* Ensure ->event_work is done */
5901 flush_workqueue(md_misc_wq);
5902 spin_lock(&mddev->lock);
5904 spin_unlock(&mddev->lock);
5905 pers->free(mddev, mddev->private);
5906 mddev->private = NULL;
5907 if (pers->sync_request && mddev->to_remove == NULL)
5908 mddev->to_remove = &md_redundancy_group;
5909 module_put(pers->owner);
5910 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5913 void md_stop(struct mddev *mddev)
5915 /* stop the array and free an attached data structures.
5916 * This is called from dm-raid
5919 if (mddev->flush_bio_pool) {
5920 mempool_destroy(mddev->flush_bio_pool);
5921 mddev->flush_bio_pool = NULL;
5923 if (mddev->flush_pool) {
5924 mempool_destroy(mddev->flush_pool);
5925 mddev->flush_pool = NULL;
5927 bioset_exit(&mddev->bio_set);
5928 bioset_exit(&mddev->sync_set);
5931 EXPORT_SYMBOL_GPL(md_stop);
5933 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5938 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5940 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5941 md_wakeup_thread(mddev->thread);
5943 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5944 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5945 if (mddev->sync_thread)
5946 /* Thread might be blocked waiting for metadata update
5947 * which will now never happen */
5948 wake_up_process(mddev->sync_thread->tsk);
5950 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5952 mddev_unlock(mddev);
5953 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5955 wait_event(mddev->sb_wait,
5956 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5957 mddev_lock_nointr(mddev);
5959 mutex_lock(&mddev->open_mutex);
5960 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5961 mddev->sync_thread ||
5962 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5963 pr_warn("md: %s still in use.\n",mdname(mddev));
5965 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5966 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5967 md_wakeup_thread(mddev->thread);
5973 __md_stop_writes(mddev);
5979 set_disk_ro(mddev->gendisk, 1);
5980 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5981 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5982 md_wakeup_thread(mddev->thread);
5983 sysfs_notify_dirent_safe(mddev->sysfs_state);
5987 mutex_unlock(&mddev->open_mutex);
5992 * 0 - completely stop and dis-assemble array
5993 * 2 - stop but do not disassemble array
5995 static int do_md_stop(struct mddev *mddev, int mode,
5996 struct block_device *bdev)
5998 struct gendisk *disk = mddev->gendisk;
5999 struct md_rdev *rdev;
6002 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6004 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6005 md_wakeup_thread(mddev->thread);
6007 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6008 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6009 if (mddev->sync_thread)
6010 /* Thread might be blocked waiting for metadata update
6011 * which will now never happen */
6012 wake_up_process(mddev->sync_thread->tsk);
6014 mddev_unlock(mddev);
6015 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6016 !test_bit(MD_RECOVERY_RUNNING,
6017 &mddev->recovery)));
6018 mddev_lock_nointr(mddev);
6020 mutex_lock(&mddev->open_mutex);
6021 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6022 mddev->sysfs_active ||
6023 mddev->sync_thread ||
6024 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6025 pr_warn("md: %s still in use.\n",mdname(mddev));
6026 mutex_unlock(&mddev->open_mutex);
6028 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6029 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6030 md_wakeup_thread(mddev->thread);
6036 set_disk_ro(disk, 0);
6038 __md_stop_writes(mddev);
6040 mddev->queue->backing_dev_info->congested_fn = NULL;
6042 /* tell userspace to handle 'inactive' */
6043 sysfs_notify_dirent_safe(mddev->sysfs_state);
6045 rdev_for_each(rdev, mddev)
6046 if (rdev->raid_disk >= 0)
6047 sysfs_unlink_rdev(mddev, rdev);
6049 set_capacity(disk, 0);
6050 mutex_unlock(&mddev->open_mutex);
6052 revalidate_disk(disk);
6057 mutex_unlock(&mddev->open_mutex);
6059 * Free resources if final stop
6062 pr_info("md: %s stopped.\n", mdname(mddev));
6064 if (mddev->bitmap_info.file) {
6065 struct file *f = mddev->bitmap_info.file;
6066 spin_lock(&mddev->lock);
6067 mddev->bitmap_info.file = NULL;
6068 spin_unlock(&mddev->lock);
6071 mddev->bitmap_info.offset = 0;
6073 export_array(mddev);
6076 if (mddev->hold_active == UNTIL_STOP)
6077 mddev->hold_active = 0;
6079 md_new_event(mddev);
6080 sysfs_notify_dirent_safe(mddev->sysfs_state);
6085 static void autorun_array(struct mddev *mddev)
6087 struct md_rdev *rdev;
6090 if (list_empty(&mddev->disks))
6093 pr_info("md: running: ");
6095 rdev_for_each(rdev, mddev) {
6096 char b[BDEVNAME_SIZE];
6097 pr_cont("<%s>", bdevname(rdev->bdev,b));
6101 err = do_md_run(mddev);
6103 pr_warn("md: do_md_run() returned %d\n", err);
6104 do_md_stop(mddev, 0, NULL);
6109 * lets try to run arrays based on all disks that have arrived
6110 * until now. (those are in pending_raid_disks)
6112 * the method: pick the first pending disk, collect all disks with
6113 * the same UUID, remove all from the pending list and put them into
6114 * the 'same_array' list. Then order this list based on superblock
6115 * update time (freshest comes first), kick out 'old' disks and
6116 * compare superblocks. If everything's fine then run it.
6118 * If "unit" is allocated, then bump its reference count
6120 static void autorun_devices(int part)
6122 struct md_rdev *rdev0, *rdev, *tmp;
6123 struct mddev *mddev;
6124 char b[BDEVNAME_SIZE];
6126 pr_info("md: autorun ...\n");
6127 while (!list_empty(&pending_raid_disks)) {
6130 LIST_HEAD(candidates);
6131 rdev0 = list_entry(pending_raid_disks.next,
6132 struct md_rdev, same_set);
6134 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6135 INIT_LIST_HEAD(&candidates);
6136 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6137 if (super_90_load(rdev, rdev0, 0) >= 0) {
6138 pr_debug("md: adding %s ...\n",
6139 bdevname(rdev->bdev,b));
6140 list_move(&rdev->same_set, &candidates);
6143 * now we have a set of devices, with all of them having
6144 * mostly sane superblocks. It's time to allocate the
6148 dev = MKDEV(mdp_major,
6149 rdev0->preferred_minor << MdpMinorShift);
6150 unit = MINOR(dev) >> MdpMinorShift;
6152 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6155 if (rdev0->preferred_minor != unit) {
6156 pr_warn("md: unit number in %s is bad: %d\n",
6157 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6161 md_probe(dev, NULL, NULL);
6162 mddev = mddev_find(dev);
6163 if (!mddev || !mddev->gendisk) {
6168 if (mddev_lock(mddev))
6169 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6170 else if (mddev->raid_disks || mddev->major_version
6171 || !list_empty(&mddev->disks)) {
6172 pr_warn("md: %s already running, cannot run %s\n",
6173 mdname(mddev), bdevname(rdev0->bdev,b));
6174 mddev_unlock(mddev);
6176 pr_debug("md: created %s\n", mdname(mddev));
6177 mddev->persistent = 1;
6178 rdev_for_each_list(rdev, tmp, &candidates) {
6179 list_del_init(&rdev->same_set);
6180 if (bind_rdev_to_array(rdev, mddev))
6183 autorun_array(mddev);
6184 mddev_unlock(mddev);
6186 /* on success, candidates will be empty, on error
6189 rdev_for_each_list(rdev, tmp, &candidates) {
6190 list_del_init(&rdev->same_set);
6195 pr_info("md: ... autorun DONE.\n");
6197 #endif /* !MODULE */
6199 static int get_version(void __user *arg)
6203 ver.major = MD_MAJOR_VERSION;
6204 ver.minor = MD_MINOR_VERSION;
6205 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6207 if (copy_to_user(arg, &ver, sizeof(ver)))
6213 static int get_array_info(struct mddev *mddev, void __user *arg)
6215 mdu_array_info_t info;
6216 int nr,working,insync,failed,spare;
6217 struct md_rdev *rdev;
6219 nr = working = insync = failed = spare = 0;
6221 rdev_for_each_rcu(rdev, mddev) {
6223 if (test_bit(Faulty, &rdev->flags))
6227 if (test_bit(In_sync, &rdev->flags))
6229 else if (test_bit(Journal, &rdev->flags))
6230 /* TODO: add journal count to md_u.h */
6238 info.major_version = mddev->major_version;
6239 info.minor_version = mddev->minor_version;
6240 info.patch_version = MD_PATCHLEVEL_VERSION;
6241 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6242 info.level = mddev->level;
6243 info.size = mddev->dev_sectors / 2;
6244 if (info.size != mddev->dev_sectors / 2) /* overflow */
6247 info.raid_disks = mddev->raid_disks;
6248 info.md_minor = mddev->md_minor;
6249 info.not_persistent= !mddev->persistent;
6251 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6254 info.state = (1<<MD_SB_CLEAN);
6255 if (mddev->bitmap && mddev->bitmap_info.offset)
6256 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6257 if (mddev_is_clustered(mddev))
6258 info.state |= (1<<MD_SB_CLUSTERED);
6259 info.active_disks = insync;
6260 info.working_disks = working;
6261 info.failed_disks = failed;
6262 info.spare_disks = spare;
6264 info.layout = mddev->layout;
6265 info.chunk_size = mddev->chunk_sectors << 9;
6267 if (copy_to_user(arg, &info, sizeof(info)))
6273 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6275 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6279 file = kzalloc(sizeof(*file), GFP_NOIO);
6284 spin_lock(&mddev->lock);
6285 /* bitmap enabled */
6286 if (mddev->bitmap_info.file) {
6287 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6288 sizeof(file->pathname));
6292 memmove(file->pathname, ptr,
6293 sizeof(file->pathname)-(ptr-file->pathname));
6295 spin_unlock(&mddev->lock);
6298 copy_to_user(arg, file, sizeof(*file)))
6305 static int get_disk_info(struct mddev *mddev, void __user * arg)
6307 mdu_disk_info_t info;
6308 struct md_rdev *rdev;
6310 if (copy_from_user(&info, arg, sizeof(info)))
6314 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6316 info.major = MAJOR(rdev->bdev->bd_dev);
6317 info.minor = MINOR(rdev->bdev->bd_dev);
6318 info.raid_disk = rdev->raid_disk;
6320 if (test_bit(Faulty, &rdev->flags))
6321 info.state |= (1<<MD_DISK_FAULTY);
6322 else if (test_bit(In_sync, &rdev->flags)) {
6323 info.state |= (1<<MD_DISK_ACTIVE);
6324 info.state |= (1<<MD_DISK_SYNC);
6326 if (test_bit(Journal, &rdev->flags))
6327 info.state |= (1<<MD_DISK_JOURNAL);
6328 if (test_bit(WriteMostly, &rdev->flags))
6329 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6330 if (test_bit(FailFast, &rdev->flags))
6331 info.state |= (1<<MD_DISK_FAILFAST);
6333 info.major = info.minor = 0;
6334 info.raid_disk = -1;
6335 info.state = (1<<MD_DISK_REMOVED);
6339 if (copy_to_user(arg, &info, sizeof(info)))
6345 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6347 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6348 struct md_rdev *rdev;
6349 dev_t dev = MKDEV(info->major,info->minor);
6351 if (mddev_is_clustered(mddev) &&
6352 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6353 pr_warn("%s: Cannot add to clustered mddev.\n",
6358 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6361 if (!mddev->raid_disks) {
6363 /* expecting a device which has a superblock */
6364 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6366 pr_warn("md: md_import_device returned %ld\n",
6368 return PTR_ERR(rdev);
6370 if (!list_empty(&mddev->disks)) {
6371 struct md_rdev *rdev0
6372 = list_entry(mddev->disks.next,
6373 struct md_rdev, same_set);
6374 err = super_types[mddev->major_version]
6375 .load_super(rdev, rdev0, mddev->minor_version);
6377 pr_warn("md: %s has different UUID to %s\n",
6378 bdevname(rdev->bdev,b),
6379 bdevname(rdev0->bdev,b2));
6384 err = bind_rdev_to_array(rdev, mddev);
6391 * add_new_disk can be used once the array is assembled
6392 * to add "hot spares". They must already have a superblock
6397 if (!mddev->pers->hot_add_disk) {
6398 pr_warn("%s: personality does not support diskops!\n",
6402 if (mddev->persistent)
6403 rdev = md_import_device(dev, mddev->major_version,
6404 mddev->minor_version);
6406 rdev = md_import_device(dev, -1, -1);
6408 pr_warn("md: md_import_device returned %ld\n",
6410 return PTR_ERR(rdev);
6412 /* set saved_raid_disk if appropriate */
6413 if (!mddev->persistent) {
6414 if (info->state & (1<<MD_DISK_SYNC) &&
6415 info->raid_disk < mddev->raid_disks) {
6416 rdev->raid_disk = info->raid_disk;
6417 set_bit(In_sync, &rdev->flags);
6418 clear_bit(Bitmap_sync, &rdev->flags);
6420 rdev->raid_disk = -1;
6421 rdev->saved_raid_disk = rdev->raid_disk;
6423 super_types[mddev->major_version].
6424 validate_super(mddev, rdev);
6425 if ((info->state & (1<<MD_DISK_SYNC)) &&
6426 rdev->raid_disk != info->raid_disk) {
6427 /* This was a hot-add request, but events doesn't
6428 * match, so reject it.
6434 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6435 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6436 set_bit(WriteMostly, &rdev->flags);
6438 clear_bit(WriteMostly, &rdev->flags);
6439 if (info->state & (1<<MD_DISK_FAILFAST))
6440 set_bit(FailFast, &rdev->flags);
6442 clear_bit(FailFast, &rdev->flags);
6444 if (info->state & (1<<MD_DISK_JOURNAL)) {
6445 struct md_rdev *rdev2;
6446 bool has_journal = false;
6448 /* make sure no existing journal disk */
6449 rdev_for_each(rdev2, mddev) {
6450 if (test_bit(Journal, &rdev2->flags)) {
6455 if (has_journal || mddev->bitmap) {
6459 set_bit(Journal, &rdev->flags);
6462 * check whether the device shows up in other nodes
6464 if (mddev_is_clustered(mddev)) {
6465 if (info->state & (1 << MD_DISK_CANDIDATE))
6466 set_bit(Candidate, &rdev->flags);
6467 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6468 /* --add initiated by this node */
6469 err = md_cluster_ops->add_new_disk(mddev, rdev);
6477 rdev->raid_disk = -1;
6478 err = bind_rdev_to_array(rdev, mddev);
6483 if (mddev_is_clustered(mddev)) {
6484 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6486 err = md_cluster_ops->new_disk_ack(mddev,
6489 md_kick_rdev_from_array(rdev);
6493 md_cluster_ops->add_new_disk_cancel(mddev);
6495 err = add_bound_rdev(rdev);
6499 err = add_bound_rdev(rdev);
6504 /* otherwise, add_new_disk is only allowed
6505 * for major_version==0 superblocks
6507 if (mddev->major_version != 0) {
6508 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6512 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6514 rdev = md_import_device(dev, -1, 0);
6516 pr_warn("md: error, md_import_device() returned %ld\n",
6518 return PTR_ERR(rdev);
6520 rdev->desc_nr = info->number;
6521 if (info->raid_disk < mddev->raid_disks)
6522 rdev->raid_disk = info->raid_disk;
6524 rdev->raid_disk = -1;
6526 if (rdev->raid_disk < mddev->raid_disks)
6527 if (info->state & (1<<MD_DISK_SYNC))
6528 set_bit(In_sync, &rdev->flags);
6530 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6531 set_bit(WriteMostly, &rdev->flags);
6532 if (info->state & (1<<MD_DISK_FAILFAST))
6533 set_bit(FailFast, &rdev->flags);
6535 if (!mddev->persistent) {
6536 pr_debug("md: nonpersistent superblock ...\n");
6537 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6539 rdev->sb_start = calc_dev_sboffset(rdev);
6540 rdev->sectors = rdev->sb_start;
6542 err = bind_rdev_to_array(rdev, mddev);
6552 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6554 char b[BDEVNAME_SIZE];
6555 struct md_rdev *rdev;
6560 rdev = find_rdev(mddev, dev);
6564 if (rdev->raid_disk < 0)
6567 clear_bit(Blocked, &rdev->flags);
6568 remove_and_add_spares(mddev, rdev);
6570 if (rdev->raid_disk >= 0)
6574 if (mddev_is_clustered(mddev))
6575 md_cluster_ops->remove_disk(mddev, rdev);
6577 md_kick_rdev_from_array(rdev);
6578 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6580 md_wakeup_thread(mddev->thread);
6582 md_update_sb(mddev, 1);
6583 md_new_event(mddev);
6587 pr_debug("md: cannot remove active disk %s from %s ...\n",
6588 bdevname(rdev->bdev,b), mdname(mddev));
6592 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6594 char b[BDEVNAME_SIZE];
6596 struct md_rdev *rdev;
6601 if (mddev->major_version != 0) {
6602 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6606 if (!mddev->pers->hot_add_disk) {
6607 pr_warn("%s: personality does not support diskops!\n",
6612 rdev = md_import_device(dev, -1, 0);
6614 pr_warn("md: error, md_import_device() returned %ld\n",
6619 if (mddev->persistent)
6620 rdev->sb_start = calc_dev_sboffset(rdev);
6622 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6624 rdev->sectors = rdev->sb_start;
6626 if (test_bit(Faulty, &rdev->flags)) {
6627 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6628 bdevname(rdev->bdev,b), mdname(mddev));
6633 clear_bit(In_sync, &rdev->flags);
6635 rdev->saved_raid_disk = -1;
6636 err = bind_rdev_to_array(rdev, mddev);
6641 * The rest should better be atomic, we can have disk failures
6642 * noticed in interrupt contexts ...
6645 rdev->raid_disk = -1;
6647 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6649 md_update_sb(mddev, 1);
6651 * Kick recovery, maybe this spare has to be added to the
6652 * array immediately.
6654 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6655 md_wakeup_thread(mddev->thread);
6656 md_new_event(mddev);
6664 static int set_bitmap_file(struct mddev *mddev, int fd)
6669 if (!mddev->pers->quiesce || !mddev->thread)
6671 if (mddev->recovery || mddev->sync_thread)
6673 /* we should be able to change the bitmap.. */
6677 struct inode *inode;
6680 if (mddev->bitmap || mddev->bitmap_info.file)
6681 return -EEXIST; /* cannot add when bitmap is present */
6685 pr_warn("%s: error: failed to get bitmap file\n",
6690 inode = f->f_mapping->host;
6691 if (!S_ISREG(inode->i_mode)) {
6692 pr_warn("%s: error: bitmap file must be a regular file\n",
6695 } else if (!(f->f_mode & FMODE_WRITE)) {
6696 pr_warn("%s: error: bitmap file must open for write\n",
6699 } else if (atomic_read(&inode->i_writecount) != 1) {
6700 pr_warn("%s: error: bitmap file is already in use\n",
6708 mddev->bitmap_info.file = f;
6709 mddev->bitmap_info.offset = 0; /* file overrides offset */
6710 } else if (mddev->bitmap == NULL)
6711 return -ENOENT; /* cannot remove what isn't there */
6715 struct bitmap *bitmap;
6717 bitmap = md_bitmap_create(mddev, -1);
6718 mddev_suspend(mddev);
6719 if (!IS_ERR(bitmap)) {
6720 mddev->bitmap = bitmap;
6721 err = md_bitmap_load(mddev);
6723 err = PTR_ERR(bitmap);
6725 md_bitmap_destroy(mddev);
6728 mddev_resume(mddev);
6729 } else if (fd < 0) {
6730 mddev_suspend(mddev);
6731 md_bitmap_destroy(mddev);
6732 mddev_resume(mddev);
6736 struct file *f = mddev->bitmap_info.file;
6738 spin_lock(&mddev->lock);
6739 mddev->bitmap_info.file = NULL;
6740 spin_unlock(&mddev->lock);
6749 * set_array_info is used two different ways
6750 * The original usage is when creating a new array.
6751 * In this usage, raid_disks is > 0 and it together with
6752 * level, size, not_persistent,layout,chunksize determine the
6753 * shape of the array.
6754 * This will always create an array with a type-0.90.0 superblock.
6755 * The newer usage is when assembling an array.
6756 * In this case raid_disks will be 0, and the major_version field is
6757 * use to determine which style super-blocks are to be found on the devices.
6758 * The minor and patch _version numbers are also kept incase the
6759 * super_block handler wishes to interpret them.
6761 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6764 if (info->raid_disks == 0) {
6765 /* just setting version number for superblock loading */
6766 if (info->major_version < 0 ||
6767 info->major_version >= ARRAY_SIZE(super_types) ||
6768 super_types[info->major_version].name == NULL) {
6769 /* maybe try to auto-load a module? */
6770 pr_warn("md: superblock version %d not known\n",
6771 info->major_version);
6774 mddev->major_version = info->major_version;
6775 mddev->minor_version = info->minor_version;
6776 mddev->patch_version = info->patch_version;
6777 mddev->persistent = !info->not_persistent;
6778 /* ensure mddev_put doesn't delete this now that there
6779 * is some minimal configuration.
6781 mddev->ctime = ktime_get_real_seconds();
6784 mddev->major_version = MD_MAJOR_VERSION;
6785 mddev->minor_version = MD_MINOR_VERSION;
6786 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6787 mddev->ctime = ktime_get_real_seconds();
6789 mddev->level = info->level;
6790 mddev->clevel[0] = 0;
6791 mddev->dev_sectors = 2 * (sector_t)info->size;
6792 mddev->raid_disks = info->raid_disks;
6793 /* don't set md_minor, it is determined by which /dev/md* was
6796 if (info->state & (1<<MD_SB_CLEAN))
6797 mddev->recovery_cp = MaxSector;
6799 mddev->recovery_cp = 0;
6800 mddev->persistent = ! info->not_persistent;
6801 mddev->external = 0;
6803 mddev->layout = info->layout;
6804 mddev->chunk_sectors = info->chunk_size >> 9;
6806 if (mddev->persistent) {
6807 mddev->max_disks = MD_SB_DISKS;
6809 mddev->sb_flags = 0;
6811 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6813 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6814 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6815 mddev->bitmap_info.offset = 0;
6817 mddev->reshape_position = MaxSector;
6820 * Generate a 128 bit UUID
6822 get_random_bytes(mddev->uuid, 16);
6824 mddev->new_level = mddev->level;
6825 mddev->new_chunk_sectors = mddev->chunk_sectors;
6826 mddev->new_layout = mddev->layout;
6827 mddev->delta_disks = 0;
6828 mddev->reshape_backwards = 0;
6833 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6835 lockdep_assert_held(&mddev->reconfig_mutex);
6837 if (mddev->external_size)
6840 mddev->array_sectors = array_sectors;
6842 EXPORT_SYMBOL(md_set_array_sectors);
6844 static int update_size(struct mddev *mddev, sector_t num_sectors)
6846 struct md_rdev *rdev;
6848 int fit = (num_sectors == 0);
6849 sector_t old_dev_sectors = mddev->dev_sectors;
6851 if (mddev->pers->resize == NULL)
6853 /* The "num_sectors" is the number of sectors of each device that
6854 * is used. This can only make sense for arrays with redundancy.
6855 * linear and raid0 always use whatever space is available. We can only
6856 * consider changing this number if no resync or reconstruction is
6857 * happening, and if the new size is acceptable. It must fit before the
6858 * sb_start or, if that is <data_offset, it must fit before the size
6859 * of each device. If num_sectors is zero, we find the largest size
6862 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6868 rdev_for_each(rdev, mddev) {
6869 sector_t avail = rdev->sectors;
6871 if (fit && (num_sectors == 0 || num_sectors > avail))
6872 num_sectors = avail;
6873 if (avail < num_sectors)
6876 rv = mddev->pers->resize(mddev, num_sectors);
6878 if (mddev_is_clustered(mddev))
6879 md_cluster_ops->update_size(mddev, old_dev_sectors);
6880 else if (mddev->queue) {
6881 set_capacity(mddev->gendisk, mddev->array_sectors);
6882 revalidate_disk(mddev->gendisk);
6888 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6891 struct md_rdev *rdev;
6892 /* change the number of raid disks */
6893 if (mddev->pers->check_reshape == NULL)
6897 if (raid_disks <= 0 ||
6898 (mddev->max_disks && raid_disks >= mddev->max_disks))
6900 if (mddev->sync_thread ||
6901 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6902 mddev->reshape_position != MaxSector)
6905 rdev_for_each(rdev, mddev) {
6906 if (mddev->raid_disks < raid_disks &&
6907 rdev->data_offset < rdev->new_data_offset)
6909 if (mddev->raid_disks > raid_disks &&
6910 rdev->data_offset > rdev->new_data_offset)
6914 mddev->delta_disks = raid_disks - mddev->raid_disks;
6915 if (mddev->delta_disks < 0)
6916 mddev->reshape_backwards = 1;
6917 else if (mddev->delta_disks > 0)
6918 mddev->reshape_backwards = 0;
6920 rv = mddev->pers->check_reshape(mddev);
6922 mddev->delta_disks = 0;
6923 mddev->reshape_backwards = 0;
6929 * update_array_info is used to change the configuration of an
6931 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6932 * fields in the info are checked against the array.
6933 * Any differences that cannot be handled will cause an error.
6934 * Normally, only one change can be managed at a time.
6936 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6942 /* calculate expected state,ignoring low bits */
6943 if (mddev->bitmap && mddev->bitmap_info.offset)
6944 state |= (1 << MD_SB_BITMAP_PRESENT);
6946 if (mddev->major_version != info->major_version ||
6947 mddev->minor_version != info->minor_version ||
6948 /* mddev->patch_version != info->patch_version || */
6949 mddev->ctime != info->ctime ||
6950 mddev->level != info->level ||
6951 /* mddev->layout != info->layout || */
6952 mddev->persistent != !info->not_persistent ||
6953 mddev->chunk_sectors != info->chunk_size >> 9 ||
6954 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6955 ((state^info->state) & 0xfffffe00)
6958 /* Check there is only one change */
6959 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6961 if (mddev->raid_disks != info->raid_disks)
6963 if (mddev->layout != info->layout)
6965 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6972 if (mddev->layout != info->layout) {
6974 * we don't need to do anything at the md level, the
6975 * personality will take care of it all.
6977 if (mddev->pers->check_reshape == NULL)
6980 mddev->new_layout = info->layout;
6981 rv = mddev->pers->check_reshape(mddev);
6983 mddev->new_layout = mddev->layout;
6987 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6988 rv = update_size(mddev, (sector_t)info->size * 2);
6990 if (mddev->raid_disks != info->raid_disks)
6991 rv = update_raid_disks(mddev, info->raid_disks);
6993 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6994 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6998 if (mddev->recovery || mddev->sync_thread) {
7002 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7003 struct bitmap *bitmap;
7004 /* add the bitmap */
7005 if (mddev->bitmap) {
7009 if (mddev->bitmap_info.default_offset == 0) {
7013 mddev->bitmap_info.offset =
7014 mddev->bitmap_info.default_offset;
7015 mddev->bitmap_info.space =
7016 mddev->bitmap_info.default_space;
7017 bitmap = md_bitmap_create(mddev, -1);
7018 mddev_suspend(mddev);
7019 if (!IS_ERR(bitmap)) {
7020 mddev->bitmap = bitmap;
7021 rv = md_bitmap_load(mddev);
7023 rv = PTR_ERR(bitmap);
7025 md_bitmap_destroy(mddev);
7026 mddev_resume(mddev);
7028 /* remove the bitmap */
7029 if (!mddev->bitmap) {
7033 if (mddev->bitmap->storage.file) {
7037 if (mddev->bitmap_info.nodes) {
7038 /* hold PW on all the bitmap lock */
7039 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7040 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7042 md_cluster_ops->unlock_all_bitmaps(mddev);
7046 mddev->bitmap_info.nodes = 0;
7047 md_cluster_ops->leave(mddev);
7049 mddev_suspend(mddev);
7050 md_bitmap_destroy(mddev);
7051 mddev_resume(mddev);
7052 mddev->bitmap_info.offset = 0;
7055 md_update_sb(mddev, 1);
7061 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7063 struct md_rdev *rdev;
7066 if (mddev->pers == NULL)
7070 rdev = md_find_rdev_rcu(mddev, dev);
7074 md_error(mddev, rdev);
7075 if (!test_bit(Faulty, &rdev->flags))
7083 * We have a problem here : there is no easy way to give a CHS
7084 * virtual geometry. We currently pretend that we have a 2 heads
7085 * 4 sectors (with a BIG number of cylinders...). This drives
7086 * dosfs just mad... ;-)
7088 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7090 struct mddev *mddev = bdev->bd_disk->private_data;
7094 geo->cylinders = mddev->array_sectors / 8;
7098 static inline bool md_ioctl_valid(unsigned int cmd)
7103 case GET_ARRAY_INFO:
7104 case GET_BITMAP_FILE:
7107 case HOT_REMOVE_DISK:
7110 case RESTART_ARRAY_RW:
7112 case SET_ARRAY_INFO:
7113 case SET_BITMAP_FILE:
7114 case SET_DISK_FAULTY:
7117 case CLUSTERED_DISK_NACK:
7124 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7125 unsigned int cmd, unsigned long arg)
7128 void __user *argp = (void __user *)arg;
7129 struct mddev *mddev = NULL;
7131 bool did_set_md_closing = false;
7133 if (!md_ioctl_valid(cmd))
7138 case GET_ARRAY_INFO:
7142 if (!capable(CAP_SYS_ADMIN))
7147 * Commands dealing with the RAID driver but not any
7152 err = get_version(argp);
7158 autostart_arrays(arg);
7165 * Commands creating/starting a new array:
7168 mddev = bdev->bd_disk->private_data;
7175 /* Some actions do not requires the mutex */
7177 case GET_ARRAY_INFO:
7178 if (!mddev->raid_disks && !mddev->external)
7181 err = get_array_info(mddev, argp);
7185 if (!mddev->raid_disks && !mddev->external)
7188 err = get_disk_info(mddev, argp);
7191 case SET_DISK_FAULTY:
7192 err = set_disk_faulty(mddev, new_decode_dev(arg));
7195 case GET_BITMAP_FILE:
7196 err = get_bitmap_file(mddev, argp);
7201 if (cmd == ADD_NEW_DISK)
7202 /* need to ensure md_delayed_delete() has completed */
7203 flush_workqueue(md_misc_wq);
7205 if (cmd == HOT_REMOVE_DISK)
7206 /* need to ensure recovery thread has run */
7207 wait_event_interruptible_timeout(mddev->sb_wait,
7208 !test_bit(MD_RECOVERY_NEEDED,
7210 msecs_to_jiffies(5000));
7211 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7212 /* Need to flush page cache, and ensure no-one else opens
7215 mutex_lock(&mddev->open_mutex);
7216 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7217 mutex_unlock(&mddev->open_mutex);
7221 WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
7222 set_bit(MD_CLOSING, &mddev->flags);
7223 did_set_md_closing = true;
7224 mutex_unlock(&mddev->open_mutex);
7225 sync_blockdev(bdev);
7227 err = mddev_lock(mddev);
7229 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7234 if (cmd == SET_ARRAY_INFO) {
7235 mdu_array_info_t info;
7237 memset(&info, 0, sizeof(info));
7238 else if (copy_from_user(&info, argp, sizeof(info))) {
7243 err = update_array_info(mddev, &info);
7245 pr_warn("md: couldn't update array info. %d\n", err);
7250 if (!list_empty(&mddev->disks)) {
7251 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7255 if (mddev->raid_disks) {
7256 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7260 err = set_array_info(mddev, &info);
7262 pr_warn("md: couldn't set array info. %d\n", err);
7269 * Commands querying/configuring an existing array:
7271 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7272 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7273 if ((!mddev->raid_disks && !mddev->external)
7274 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7275 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7276 && cmd != GET_BITMAP_FILE) {
7282 * Commands even a read-only array can execute:
7285 case RESTART_ARRAY_RW:
7286 err = restart_array(mddev);
7290 err = do_md_stop(mddev, 0, bdev);
7294 err = md_set_readonly(mddev, bdev);
7297 case HOT_REMOVE_DISK:
7298 err = hot_remove_disk(mddev, new_decode_dev(arg));
7302 /* We can support ADD_NEW_DISK on read-only arrays
7303 * only if we are re-adding a preexisting device.
7304 * So require mddev->pers and MD_DISK_SYNC.
7307 mdu_disk_info_t info;
7308 if (copy_from_user(&info, argp, sizeof(info)))
7310 else if (!(info.state & (1<<MD_DISK_SYNC)))
7311 /* Need to clear read-only for this */
7314 err = add_new_disk(mddev, &info);
7320 if (get_user(ro, (int __user *)(arg))) {
7326 /* if the bdev is going readonly the value of mddev->ro
7327 * does not matter, no writes are coming
7332 /* are we are already prepared for writes? */
7336 /* transitioning to readauto need only happen for
7337 * arrays that call md_write_start
7340 err = restart_array(mddev);
7343 set_disk_ro(mddev->gendisk, 0);
7350 * The remaining ioctls are changing the state of the
7351 * superblock, so we do not allow them on read-only arrays.
7353 if (mddev->ro && mddev->pers) {
7354 if (mddev->ro == 2) {
7356 sysfs_notify_dirent_safe(mddev->sysfs_state);
7357 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7358 /* mddev_unlock will wake thread */
7359 /* If a device failed while we were read-only, we
7360 * need to make sure the metadata is updated now.
7362 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7363 mddev_unlock(mddev);
7364 wait_event(mddev->sb_wait,
7365 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7366 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7367 mddev_lock_nointr(mddev);
7378 mdu_disk_info_t info;
7379 if (copy_from_user(&info, argp, sizeof(info)))
7382 err = add_new_disk(mddev, &info);
7386 case CLUSTERED_DISK_NACK:
7387 if (mddev_is_clustered(mddev))
7388 md_cluster_ops->new_disk_ack(mddev, false);
7394 err = hot_add_disk(mddev, new_decode_dev(arg));
7398 err = do_md_run(mddev);
7401 case SET_BITMAP_FILE:
7402 err = set_bitmap_file(mddev, (int)arg);
7411 if (mddev->hold_active == UNTIL_IOCTL &&
7413 mddev->hold_active = 0;
7414 mddev_unlock(mddev);
7416 if(did_set_md_closing)
7417 clear_bit(MD_CLOSING, &mddev->flags);
7420 #ifdef CONFIG_COMPAT
7421 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7422 unsigned int cmd, unsigned long arg)
7425 case HOT_REMOVE_DISK:
7427 case SET_DISK_FAULTY:
7428 case SET_BITMAP_FILE:
7429 /* These take in integer arg, do not convert */
7432 arg = (unsigned long)compat_ptr(arg);
7436 return md_ioctl(bdev, mode, cmd, arg);
7438 #endif /* CONFIG_COMPAT */
7440 static int md_open(struct block_device *bdev, fmode_t mode)
7443 * Succeed if we can lock the mddev, which confirms that
7444 * it isn't being stopped right now.
7446 struct mddev *mddev = mddev_find(bdev->bd_dev);
7452 if (mddev->gendisk != bdev->bd_disk) {
7453 /* we are racing with mddev_put which is discarding this
7457 /* Wait until bdev->bd_disk is definitely gone */
7458 flush_workqueue(md_misc_wq);
7459 /* Then retry the open from the top */
7460 return -ERESTARTSYS;
7462 BUG_ON(mddev != bdev->bd_disk->private_data);
7464 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7467 if (test_bit(MD_CLOSING, &mddev->flags)) {
7468 mutex_unlock(&mddev->open_mutex);
7474 atomic_inc(&mddev->openers);
7475 mutex_unlock(&mddev->open_mutex);
7477 check_disk_change(bdev);
7484 static void md_release(struct gendisk *disk, fmode_t mode)
7486 struct mddev *mddev = disk->private_data;
7489 atomic_dec(&mddev->openers);
7493 static int md_media_changed(struct gendisk *disk)
7495 struct mddev *mddev = disk->private_data;
7497 return mddev->changed;
7500 static int md_revalidate(struct gendisk *disk)
7502 struct mddev *mddev = disk->private_data;
7507 static const struct block_device_operations md_fops =
7509 .owner = THIS_MODULE,
7511 .release = md_release,
7513 #ifdef CONFIG_COMPAT
7514 .compat_ioctl = md_compat_ioctl,
7516 .getgeo = md_getgeo,
7517 .media_changed = md_media_changed,
7518 .revalidate_disk= md_revalidate,
7521 static int md_thread(void *arg)
7523 struct md_thread *thread = arg;
7526 * md_thread is a 'system-thread', it's priority should be very
7527 * high. We avoid resource deadlocks individually in each
7528 * raid personality. (RAID5 does preallocation) We also use RR and
7529 * the very same RT priority as kswapd, thus we will never get
7530 * into a priority inversion deadlock.
7532 * we definitely have to have equal or higher priority than
7533 * bdflush, otherwise bdflush will deadlock if there are too
7534 * many dirty RAID5 blocks.
7537 allow_signal(SIGKILL);
7538 while (!kthread_should_stop()) {
7540 /* We need to wait INTERRUPTIBLE so that
7541 * we don't add to the load-average.
7542 * That means we need to be sure no signals are
7545 if (signal_pending(current))
7546 flush_signals(current);
7548 wait_event_interruptible_timeout
7550 test_bit(THREAD_WAKEUP, &thread->flags)
7551 || kthread_should_stop() || kthread_should_park(),
7554 clear_bit(THREAD_WAKEUP, &thread->flags);
7555 if (kthread_should_park())
7557 if (!kthread_should_stop())
7558 thread->run(thread);
7564 void md_wakeup_thread(struct md_thread *thread)
7567 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7568 set_bit(THREAD_WAKEUP, &thread->flags);
7569 wake_up(&thread->wqueue);
7572 EXPORT_SYMBOL(md_wakeup_thread);
7574 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7575 struct mddev *mddev, const char *name)
7577 struct md_thread *thread;
7579 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7583 init_waitqueue_head(&thread->wqueue);
7586 thread->mddev = mddev;
7587 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7588 thread->tsk = kthread_run(md_thread, thread,
7590 mdname(thread->mddev),
7592 if (IS_ERR(thread->tsk)) {
7598 EXPORT_SYMBOL(md_register_thread);
7600 void md_unregister_thread(struct md_thread **threadp)
7602 struct md_thread *thread = *threadp;
7605 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7606 /* Locking ensures that mddev_unlock does not wake_up a
7607 * non-existent thread
7609 spin_lock(&pers_lock);
7611 spin_unlock(&pers_lock);
7613 kthread_stop(thread->tsk);
7616 EXPORT_SYMBOL(md_unregister_thread);
7618 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7620 if (!rdev || test_bit(Faulty, &rdev->flags))
7623 if (!mddev->pers || !mddev->pers->error_handler)
7625 mddev->pers->error_handler(mddev,rdev);
7626 if (mddev->degraded)
7627 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7628 sysfs_notify_dirent_safe(rdev->sysfs_state);
7629 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7630 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7631 md_wakeup_thread(mddev->thread);
7632 if (mddev->event_work.func)
7633 queue_work(md_misc_wq, &mddev->event_work);
7634 md_new_event(mddev);
7636 EXPORT_SYMBOL(md_error);
7638 /* seq_file implementation /proc/mdstat */
7640 static void status_unused(struct seq_file *seq)
7643 struct md_rdev *rdev;
7645 seq_printf(seq, "unused devices: ");
7647 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7648 char b[BDEVNAME_SIZE];
7650 seq_printf(seq, "%s ",
7651 bdevname(rdev->bdev,b));
7654 seq_printf(seq, "<none>");
7656 seq_printf(seq, "\n");
7659 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7661 sector_t max_sectors, resync, res;
7662 unsigned long dt, db;
7665 unsigned int per_milli;
7667 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7668 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7669 max_sectors = mddev->resync_max_sectors;
7671 max_sectors = mddev->dev_sectors;
7673 resync = mddev->curr_resync;
7675 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7676 /* Still cleaning up */
7677 resync = max_sectors;
7678 } else if (resync > max_sectors)
7679 resync = max_sectors;
7681 resync -= atomic_read(&mddev->recovery_active);
7684 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
7685 struct md_rdev *rdev;
7687 rdev_for_each(rdev, mddev)
7688 if (rdev->raid_disk >= 0 &&
7689 !test_bit(Faulty, &rdev->flags) &&
7690 rdev->recovery_offset != MaxSector &&
7691 rdev->recovery_offset) {
7692 seq_printf(seq, "\trecover=REMOTE");
7695 if (mddev->reshape_position != MaxSector)
7696 seq_printf(seq, "\treshape=REMOTE");
7698 seq_printf(seq, "\tresync=REMOTE");
7701 if (mddev->recovery_cp < MaxSector) {
7702 seq_printf(seq, "\tresync=PENDING");
7708 seq_printf(seq, "\tresync=DELAYED");
7712 WARN_ON(max_sectors == 0);
7713 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7714 * in a sector_t, and (max_sectors>>scale) will fit in a
7715 * u32, as those are the requirements for sector_div.
7716 * Thus 'scale' must be at least 10
7719 if (sizeof(sector_t) > sizeof(unsigned long)) {
7720 while ( max_sectors/2 > (1ULL<<(scale+32)))
7723 res = (resync>>scale)*1000;
7724 sector_div(res, (u32)((max_sectors>>scale)+1));
7728 int i, x = per_milli/50, y = 20-x;
7729 seq_printf(seq, "[");
7730 for (i = 0; i < x; i++)
7731 seq_printf(seq, "=");
7732 seq_printf(seq, ">");
7733 for (i = 0; i < y; i++)
7734 seq_printf(seq, ".");
7735 seq_printf(seq, "] ");
7737 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7738 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7740 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7742 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7743 "resync" : "recovery"))),
7744 per_milli/10, per_milli % 10,
7745 (unsigned long long) resync/2,
7746 (unsigned long long) max_sectors/2);
7749 * dt: time from mark until now
7750 * db: blocks written from mark until now
7751 * rt: remaining time
7753 * rt is a sector_t, so could be 32bit or 64bit.
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);
7764 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7765 - mddev->resync_mark_cnt;
7767 rt = max_sectors - resync; /* number of remaining sectors */
7768 sector_div(rt, db/32+1);
7772 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7773 ((unsigned long)rt % 60)/6);
7775 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7779 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7781 struct list_head *tmp;
7783 struct mddev *mddev;
7791 spin_lock(&all_mddevs_lock);
7792 list_for_each(tmp,&all_mddevs)
7794 mddev = list_entry(tmp, struct mddev, all_mddevs);
7796 spin_unlock(&all_mddevs_lock);
7799 spin_unlock(&all_mddevs_lock);
7801 return (void*)2;/* tail */
7805 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7807 struct list_head *tmp;
7808 struct mddev *next_mddev, *mddev = v;
7814 spin_lock(&all_mddevs_lock);
7816 tmp = all_mddevs.next;
7818 tmp = mddev->all_mddevs.next;
7819 if (tmp != &all_mddevs)
7820 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7822 next_mddev = (void*)2;
7825 spin_unlock(&all_mddevs_lock);
7833 static void md_seq_stop(struct seq_file *seq, void *v)
7835 struct mddev *mddev = v;
7837 if (mddev && v != (void*)1 && v != (void*)2)
7841 static int md_seq_show(struct seq_file *seq, void *v)
7843 struct mddev *mddev = v;
7845 struct md_rdev *rdev;
7847 if (v == (void*)1) {
7848 struct md_personality *pers;
7849 seq_printf(seq, "Personalities : ");
7850 spin_lock(&pers_lock);
7851 list_for_each_entry(pers, &pers_list, list)
7852 seq_printf(seq, "[%s] ", pers->name);
7854 spin_unlock(&pers_lock);
7855 seq_printf(seq, "\n");
7856 seq->poll_event = atomic_read(&md_event_count);
7859 if (v == (void*)2) {
7864 spin_lock(&mddev->lock);
7865 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7866 seq_printf(seq, "%s : %sactive", mdname(mddev),
7867 mddev->pers ? "" : "in");
7870 seq_printf(seq, " (read-only)");
7872 seq_printf(seq, " (auto-read-only)");
7873 seq_printf(seq, " %s", mddev->pers->name);
7878 rdev_for_each_rcu(rdev, mddev) {
7879 char b[BDEVNAME_SIZE];
7880 seq_printf(seq, " %s[%d]",
7881 bdevname(rdev->bdev,b), rdev->desc_nr);
7882 if (test_bit(WriteMostly, &rdev->flags))
7883 seq_printf(seq, "(W)");
7884 if (test_bit(Journal, &rdev->flags))
7885 seq_printf(seq, "(J)");
7886 if (test_bit(Faulty, &rdev->flags)) {
7887 seq_printf(seq, "(F)");
7890 if (rdev->raid_disk < 0)
7891 seq_printf(seq, "(S)"); /* spare */
7892 if (test_bit(Replacement, &rdev->flags))
7893 seq_printf(seq, "(R)");
7894 sectors += rdev->sectors;
7898 if (!list_empty(&mddev->disks)) {
7900 seq_printf(seq, "\n %llu blocks",
7901 (unsigned long long)
7902 mddev->array_sectors / 2);
7904 seq_printf(seq, "\n %llu blocks",
7905 (unsigned long long)sectors / 2);
7907 if (mddev->persistent) {
7908 if (mddev->major_version != 0 ||
7909 mddev->minor_version != 90) {
7910 seq_printf(seq," super %d.%d",
7911 mddev->major_version,
7912 mddev->minor_version);
7914 } else if (mddev->external)
7915 seq_printf(seq, " super external:%s",
7916 mddev->metadata_type);
7918 seq_printf(seq, " super non-persistent");
7921 mddev->pers->status(seq, mddev);
7922 seq_printf(seq, "\n ");
7923 if (mddev->pers->sync_request) {
7924 if (status_resync(seq, mddev))
7925 seq_printf(seq, "\n ");
7928 seq_printf(seq, "\n ");
7930 md_bitmap_status(seq, mddev->bitmap);
7932 seq_printf(seq, "\n");
7934 spin_unlock(&mddev->lock);
7939 static const struct seq_operations md_seq_ops = {
7940 .start = md_seq_start,
7941 .next = md_seq_next,
7942 .stop = md_seq_stop,
7943 .show = md_seq_show,
7946 static int md_seq_open(struct inode *inode, struct file *file)
7948 struct seq_file *seq;
7951 error = seq_open(file, &md_seq_ops);
7955 seq = file->private_data;
7956 seq->poll_event = atomic_read(&md_event_count);
7960 static int md_unloading;
7961 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
7963 struct seq_file *seq = filp->private_data;
7967 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
7968 poll_wait(filp, &md_event_waiters, wait);
7970 /* always allow read */
7971 mask = EPOLLIN | EPOLLRDNORM;
7973 if (seq->poll_event != atomic_read(&md_event_count))
7974 mask |= EPOLLERR | EPOLLPRI;
7978 static const struct file_operations md_seq_fops = {
7979 .owner = THIS_MODULE,
7980 .open = md_seq_open,
7982 .llseek = seq_lseek,
7983 .release = seq_release,
7984 .poll = mdstat_poll,
7987 int register_md_personality(struct md_personality *p)
7989 pr_debug("md: %s personality registered for level %d\n",
7991 spin_lock(&pers_lock);
7992 list_add_tail(&p->list, &pers_list);
7993 spin_unlock(&pers_lock);
7996 EXPORT_SYMBOL(register_md_personality);
7998 int unregister_md_personality(struct md_personality *p)
8000 pr_debug("md: %s personality unregistered\n", p->name);
8001 spin_lock(&pers_lock);
8002 list_del_init(&p->list);
8003 spin_unlock(&pers_lock);
8006 EXPORT_SYMBOL(unregister_md_personality);
8008 int register_md_cluster_operations(struct md_cluster_operations *ops,
8009 struct module *module)
8012 spin_lock(&pers_lock);
8013 if (md_cluster_ops != NULL)
8016 md_cluster_ops = ops;
8017 md_cluster_mod = module;
8019 spin_unlock(&pers_lock);
8022 EXPORT_SYMBOL(register_md_cluster_operations);
8024 int unregister_md_cluster_operations(void)
8026 spin_lock(&pers_lock);
8027 md_cluster_ops = NULL;
8028 spin_unlock(&pers_lock);
8031 EXPORT_SYMBOL(unregister_md_cluster_operations);
8033 int md_setup_cluster(struct mddev *mddev, int nodes)
8035 if (!md_cluster_ops)
8036 request_module("md-cluster");
8037 spin_lock(&pers_lock);
8038 /* ensure module won't be unloaded */
8039 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8040 pr_warn("can't find md-cluster module or get it's reference.\n");
8041 spin_unlock(&pers_lock);
8044 spin_unlock(&pers_lock);
8046 return md_cluster_ops->join(mddev, nodes);
8049 void md_cluster_stop(struct mddev *mddev)
8051 if (!md_cluster_ops)
8053 md_cluster_ops->leave(mddev);
8054 module_put(md_cluster_mod);
8057 static int is_mddev_idle(struct mddev *mddev, int init)
8059 struct md_rdev *rdev;
8065 rdev_for_each_rcu(rdev, mddev) {
8066 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8067 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8068 atomic_read(&disk->sync_io);
8069 /* sync IO will cause sync_io to increase before the disk_stats
8070 * as sync_io is counted when a request starts, and
8071 * disk_stats is counted when it completes.
8072 * So resync activity will cause curr_events to be smaller than
8073 * when there was no such activity.
8074 * non-sync IO will cause disk_stat to increase without
8075 * increasing sync_io so curr_events will (eventually)
8076 * be larger than it was before. Once it becomes
8077 * substantially larger, the test below will cause
8078 * the array to appear non-idle, and resync will slow
8080 * If there is a lot of outstanding resync activity when
8081 * we set last_event to curr_events, then all that activity
8082 * completing might cause the array to appear non-idle
8083 * and resync will be slowed down even though there might
8084 * not have been non-resync activity. This will only
8085 * happen once though. 'last_events' will soon reflect
8086 * the state where there is little or no outstanding
8087 * resync requests, and further resync activity will
8088 * always make curr_events less than last_events.
8091 if (init || curr_events - rdev->last_events > 64) {
8092 rdev->last_events = curr_events;
8100 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8102 /* another "blocks" (512byte) blocks have been synced */
8103 atomic_sub(blocks, &mddev->recovery_active);
8104 wake_up(&mddev->recovery_wait);
8106 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8107 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8108 md_wakeup_thread(mddev->thread);
8109 // stop recovery, signal do_sync ....
8112 EXPORT_SYMBOL(md_done_sync);
8114 /* md_write_start(mddev, bi)
8115 * If we need to update some array metadata (e.g. 'active' flag
8116 * in superblock) before writing, schedule a superblock update
8117 * and wait for it to complete.
8118 * A return value of 'false' means that the write wasn't recorded
8119 * and cannot proceed as the array is being suspend.
8121 bool md_write_start(struct mddev *mddev, struct bio *bi)
8125 if (bio_data_dir(bi) != WRITE)
8128 BUG_ON(mddev->ro == 1);
8129 if (mddev->ro == 2) {
8130 /* need to switch to read/write */
8132 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8133 md_wakeup_thread(mddev->thread);
8134 md_wakeup_thread(mddev->sync_thread);
8138 percpu_ref_get(&mddev->writes_pending);
8139 smp_mb(); /* Match smp_mb in set_in_sync() */
8140 if (mddev->safemode == 1)
8141 mddev->safemode = 0;
8142 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8143 if (mddev->in_sync || mddev->sync_checkers) {
8144 spin_lock(&mddev->lock);
8145 if (mddev->in_sync) {
8147 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8148 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8149 md_wakeup_thread(mddev->thread);
8152 spin_unlock(&mddev->lock);
8156 sysfs_notify_dirent_safe(mddev->sysfs_state);
8157 if (!mddev->has_superblocks)
8159 wait_event(mddev->sb_wait,
8160 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8162 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8163 percpu_ref_put(&mddev->writes_pending);
8168 EXPORT_SYMBOL(md_write_start);
8170 /* md_write_inc can only be called when md_write_start() has
8171 * already been called at least once of the current request.
8172 * It increments the counter and is useful when a single request
8173 * is split into several parts. Each part causes an increment and
8174 * so needs a matching md_write_end().
8175 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8176 * a spinlocked region.
8178 void md_write_inc(struct mddev *mddev, struct bio *bi)
8180 if (bio_data_dir(bi) != WRITE)
8182 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8183 percpu_ref_get(&mddev->writes_pending);
8185 EXPORT_SYMBOL(md_write_inc);
8187 void md_write_end(struct mddev *mddev)
8189 percpu_ref_put(&mddev->writes_pending);
8191 if (mddev->safemode == 2)
8192 md_wakeup_thread(mddev->thread);
8193 else if (mddev->safemode_delay)
8194 /* The roundup() ensures this only performs locking once
8195 * every ->safemode_delay jiffies
8197 mod_timer(&mddev->safemode_timer,
8198 roundup(jiffies, mddev->safemode_delay) +
8199 mddev->safemode_delay);
8202 EXPORT_SYMBOL(md_write_end);
8204 /* md_allow_write(mddev)
8205 * Calling this ensures that the array is marked 'active' so that writes
8206 * may proceed without blocking. It is important to call this before
8207 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8208 * Must be called with mddev_lock held.
8210 void md_allow_write(struct mddev *mddev)
8216 if (!mddev->pers->sync_request)
8219 spin_lock(&mddev->lock);
8220 if (mddev->in_sync) {
8222 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8223 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8224 if (mddev->safemode_delay &&
8225 mddev->safemode == 0)
8226 mddev->safemode = 1;
8227 spin_unlock(&mddev->lock);
8228 md_update_sb(mddev, 0);
8229 sysfs_notify_dirent_safe(mddev->sysfs_state);
8230 /* wait for the dirty state to be recorded in the metadata */
8231 wait_event(mddev->sb_wait,
8232 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8234 spin_unlock(&mddev->lock);
8236 EXPORT_SYMBOL_GPL(md_allow_write);
8238 #define SYNC_MARKS 10
8239 #define SYNC_MARK_STEP (3*HZ)
8240 #define UPDATE_FREQUENCY (5*60*HZ)
8241 void md_do_sync(struct md_thread *thread)
8243 struct mddev *mddev = thread->mddev;
8244 struct mddev *mddev2;
8245 unsigned int currspeed = 0,
8247 sector_t max_sectors,j, io_sectors, recovery_done;
8248 unsigned long mark[SYNC_MARKS];
8249 unsigned long update_time;
8250 sector_t mark_cnt[SYNC_MARKS];
8252 struct list_head *tmp;
8253 sector_t last_check;
8255 struct md_rdev *rdev;
8256 char *desc, *action = NULL;
8257 struct blk_plug plug;
8260 /* just incase thread restarts... */
8261 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8262 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8264 if (mddev->ro) {/* never try to sync a read-only array */
8265 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8269 if (mddev_is_clustered(mddev)) {
8270 ret = md_cluster_ops->resync_start(mddev);
8274 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8275 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8276 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8277 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8278 && ((unsigned long long)mddev->curr_resync_completed
8279 < (unsigned long long)mddev->resync_max_sectors))
8283 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8284 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8285 desc = "data-check";
8287 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8288 desc = "requested-resync";
8292 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8297 mddev->last_sync_action = action ?: desc;
8299 /* we overload curr_resync somewhat here.
8300 * 0 == not engaged in resync at all
8301 * 2 == checking that there is no conflict with another sync
8302 * 1 == like 2, but have yielded to allow conflicting resync to
8304 * other == active in resync - this many blocks
8306 * Before starting a resync we must have set curr_resync to
8307 * 2, and then checked that every "conflicting" array has curr_resync
8308 * less than ours. When we find one that is the same or higher
8309 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8310 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8311 * This will mean we have to start checking from the beginning again.
8316 int mddev2_minor = -1;
8317 mddev->curr_resync = 2;
8320 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8322 for_each_mddev(mddev2, tmp) {
8323 if (mddev2 == mddev)
8325 if (!mddev->parallel_resync
8326 && mddev2->curr_resync
8327 && match_mddev_units(mddev, mddev2)) {
8329 if (mddev < mddev2 && mddev->curr_resync == 2) {
8330 /* arbitrarily yield */
8331 mddev->curr_resync = 1;
8332 wake_up(&resync_wait);
8334 if (mddev > mddev2 && mddev->curr_resync == 1)
8335 /* no need to wait here, we can wait the next
8336 * time 'round when curr_resync == 2
8339 /* We need to wait 'interruptible' so as not to
8340 * contribute to the load average, and not to
8341 * be caught by 'softlockup'
8343 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8344 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8345 mddev2->curr_resync >= mddev->curr_resync) {
8346 if (mddev2_minor != mddev2->md_minor) {
8347 mddev2_minor = mddev2->md_minor;
8348 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8349 desc, mdname(mddev),
8353 if (signal_pending(current))
8354 flush_signals(current);
8356 finish_wait(&resync_wait, &wq);
8359 finish_wait(&resync_wait, &wq);
8362 } while (mddev->curr_resync < 2);
8365 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8366 /* resync follows the size requested by the personality,
8367 * which defaults to physical size, but can be virtual size
8369 max_sectors = mddev->resync_max_sectors;
8370 atomic64_set(&mddev->resync_mismatches, 0);
8371 /* we don't use the checkpoint if there's a bitmap */
8372 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8373 j = mddev->resync_min;
8374 else if (!mddev->bitmap)
8375 j = mddev->recovery_cp;
8377 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8378 max_sectors = mddev->resync_max_sectors;
8380 /* recovery follows the physical size of devices */
8381 max_sectors = mddev->dev_sectors;
8384 rdev_for_each_rcu(rdev, mddev)
8385 if (rdev->raid_disk >= 0 &&
8386 !test_bit(Journal, &rdev->flags) &&
8387 !test_bit(Faulty, &rdev->flags) &&
8388 !test_bit(In_sync, &rdev->flags) &&
8389 rdev->recovery_offset < j)
8390 j = rdev->recovery_offset;
8393 /* If there is a bitmap, we need to make sure all
8394 * writes that started before we added a spare
8395 * complete before we start doing a recovery.
8396 * Otherwise the write might complete and (via
8397 * bitmap_endwrite) set a bit in the bitmap after the
8398 * recovery has checked that bit and skipped that
8401 if (mddev->bitmap) {
8402 mddev->pers->quiesce(mddev, 1);
8403 mddev->pers->quiesce(mddev, 0);
8407 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8408 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8409 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8410 speed_max(mddev), desc);
8412 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8415 for (m = 0; m < SYNC_MARKS; m++) {
8417 mark_cnt[m] = io_sectors;
8420 mddev->resync_mark = mark[last_mark];
8421 mddev->resync_mark_cnt = mark_cnt[last_mark];
8424 * Tune reconstruction:
8426 window = 32*(PAGE_SIZE/512);
8427 pr_debug("md: using %dk window, over a total of %lluk.\n",
8428 window/2, (unsigned long long)max_sectors/2);
8430 atomic_set(&mddev->recovery_active, 0);
8434 pr_debug("md: resuming %s of %s from checkpoint.\n",
8435 desc, mdname(mddev));
8436 mddev->curr_resync = j;
8438 mddev->curr_resync = 3; /* no longer delayed */
8439 mddev->curr_resync_completed = j;
8440 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8441 md_new_event(mddev);
8442 update_time = jiffies;
8444 blk_start_plug(&plug);
8445 while (j < max_sectors) {
8450 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8451 ((mddev->curr_resync > mddev->curr_resync_completed &&
8452 (mddev->curr_resync - mddev->curr_resync_completed)
8453 > (max_sectors >> 4)) ||
8454 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8455 (j - mddev->curr_resync_completed)*2
8456 >= mddev->resync_max - mddev->curr_resync_completed ||
8457 mddev->curr_resync_completed > mddev->resync_max
8459 /* time to update curr_resync_completed */
8460 wait_event(mddev->recovery_wait,
8461 atomic_read(&mddev->recovery_active) == 0);
8462 mddev->curr_resync_completed = j;
8463 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8464 j > mddev->recovery_cp)
8465 mddev->recovery_cp = j;
8466 update_time = jiffies;
8467 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8468 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8471 while (j >= mddev->resync_max &&
8472 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8473 /* As this condition is controlled by user-space,
8474 * we can block indefinitely, so use '_interruptible'
8475 * to avoid triggering warnings.
8477 flush_signals(current); /* just in case */
8478 wait_event_interruptible(mddev->recovery_wait,
8479 mddev->resync_max > j
8480 || test_bit(MD_RECOVERY_INTR,
8484 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8487 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8489 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8493 if (!skipped) { /* actual IO requested */
8494 io_sectors += sectors;
8495 atomic_add(sectors, &mddev->recovery_active);
8498 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8502 if (j > max_sectors)
8503 /* when skipping, extra large numbers can be returned. */
8506 mddev->curr_resync = j;
8507 mddev->curr_mark_cnt = io_sectors;
8508 if (last_check == 0)
8509 /* this is the earliest that rebuild will be
8510 * visible in /proc/mdstat
8512 md_new_event(mddev);
8514 if (last_check + window > io_sectors || j == max_sectors)
8517 last_check = io_sectors;
8519 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8521 int next = (last_mark+1) % SYNC_MARKS;
8523 mddev->resync_mark = mark[next];
8524 mddev->resync_mark_cnt = mark_cnt[next];
8525 mark[next] = jiffies;
8526 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8530 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8534 * this loop exits only if either when we are slower than
8535 * the 'hard' speed limit, or the system was IO-idle for
8537 * the system might be non-idle CPU-wise, but we only care
8538 * about not overloading the IO subsystem. (things like an
8539 * e2fsck being done on the RAID array should execute fast)
8543 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8544 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8545 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8547 if (currspeed > speed_min(mddev)) {
8548 if (currspeed > speed_max(mddev)) {
8552 if (!is_mddev_idle(mddev, 0)) {
8554 * Give other IO more of a chance.
8555 * The faster the devices, the less we wait.
8557 wait_event(mddev->recovery_wait,
8558 !atomic_read(&mddev->recovery_active));
8562 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8563 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8564 ? "interrupted" : "done");
8566 * this also signals 'finished resyncing' to md_stop
8568 blk_finish_plug(&plug);
8569 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8571 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8572 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8573 mddev->curr_resync > 3) {
8574 mddev->curr_resync_completed = mddev->curr_resync;
8575 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8577 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8579 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8580 mddev->curr_resync > 3) {
8581 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8582 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8583 if (mddev->curr_resync >= mddev->recovery_cp) {
8584 pr_debug("md: checkpointing %s of %s.\n",
8585 desc, mdname(mddev));
8586 if (test_bit(MD_RECOVERY_ERROR,
8588 mddev->recovery_cp =
8589 mddev->curr_resync_completed;
8591 mddev->recovery_cp =
8595 mddev->recovery_cp = MaxSector;
8597 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8598 mddev->curr_resync = MaxSector;
8599 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8600 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
8602 rdev_for_each_rcu(rdev, mddev)
8603 if (rdev->raid_disk >= 0 &&
8604 mddev->delta_disks >= 0 &&
8605 !test_bit(Journal, &rdev->flags) &&
8606 !test_bit(Faulty, &rdev->flags) &&
8607 !test_bit(In_sync, &rdev->flags) &&
8608 rdev->recovery_offset < mddev->curr_resync)
8609 rdev->recovery_offset = mddev->curr_resync;
8615 /* set CHANGE_PENDING here since maybe another update is needed,
8616 * so other nodes are informed. It should be harmless for normal
8618 set_mask_bits(&mddev->sb_flags, 0,
8619 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8621 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8622 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8623 mddev->delta_disks > 0 &&
8624 mddev->pers->finish_reshape &&
8625 mddev->pers->size &&
8627 mddev_lock_nointr(mddev);
8628 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8629 mddev_unlock(mddev);
8630 set_capacity(mddev->gendisk, mddev->array_sectors);
8631 revalidate_disk(mddev->gendisk);
8634 spin_lock(&mddev->lock);
8635 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8636 /* We completed so min/max setting can be forgotten if used. */
8637 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8638 mddev->resync_min = 0;
8639 mddev->resync_max = MaxSector;
8640 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8641 mddev->resync_min = mddev->curr_resync_completed;
8642 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8643 mddev->curr_resync = 0;
8644 spin_unlock(&mddev->lock);
8646 wake_up(&resync_wait);
8647 md_wakeup_thread(mddev->thread);
8650 EXPORT_SYMBOL_GPL(md_do_sync);
8652 static int remove_and_add_spares(struct mddev *mddev,
8653 struct md_rdev *this)
8655 struct md_rdev *rdev;
8658 bool remove_some = false;
8660 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8661 /* Mustn't remove devices when resync thread is running */
8664 rdev_for_each(rdev, mddev) {
8665 if ((this == NULL || rdev == this) &&
8666 rdev->raid_disk >= 0 &&
8667 !test_bit(Blocked, &rdev->flags) &&
8668 test_bit(Faulty, &rdev->flags) &&
8669 atomic_read(&rdev->nr_pending)==0) {
8670 /* Faulty non-Blocked devices with nr_pending == 0
8671 * never get nr_pending incremented,
8672 * never get Faulty cleared, and never get Blocked set.
8673 * So we can synchronize_rcu now rather than once per device
8676 set_bit(RemoveSynchronized, &rdev->flags);
8682 rdev_for_each(rdev, mddev) {
8683 if ((this == NULL || rdev == this) &&
8684 rdev->raid_disk >= 0 &&
8685 !test_bit(Blocked, &rdev->flags) &&
8686 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8687 (!test_bit(In_sync, &rdev->flags) &&
8688 !test_bit(Journal, &rdev->flags))) &&
8689 atomic_read(&rdev->nr_pending)==0)) {
8690 if (mddev->pers->hot_remove_disk(
8691 mddev, rdev) == 0) {
8692 sysfs_unlink_rdev(mddev, rdev);
8693 rdev->saved_raid_disk = rdev->raid_disk;
8694 rdev->raid_disk = -1;
8698 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8699 clear_bit(RemoveSynchronized, &rdev->flags);
8702 if (removed && mddev->kobj.sd)
8703 sysfs_notify(&mddev->kobj, NULL, "degraded");
8705 if (this && removed)
8708 rdev_for_each(rdev, mddev) {
8709 if (this && this != rdev)
8711 if (test_bit(Candidate, &rdev->flags))
8713 if (rdev->raid_disk >= 0 &&
8714 !test_bit(In_sync, &rdev->flags) &&
8715 !test_bit(Journal, &rdev->flags) &&
8716 !test_bit(Faulty, &rdev->flags))
8718 if (rdev->raid_disk >= 0)
8720 if (test_bit(Faulty, &rdev->flags))
8722 if (!test_bit(Journal, &rdev->flags)) {
8724 ! (rdev->saved_raid_disk >= 0 &&
8725 !test_bit(Bitmap_sync, &rdev->flags)))
8728 rdev->recovery_offset = 0;
8731 hot_add_disk(mddev, rdev) == 0) {
8732 if (sysfs_link_rdev(mddev, rdev))
8733 /* failure here is OK */;
8734 if (!test_bit(Journal, &rdev->flags))
8736 md_new_event(mddev);
8737 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8742 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8746 static void md_start_sync(struct work_struct *ws)
8748 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8750 mddev->sync_thread = md_register_thread(md_do_sync,
8753 if (!mddev->sync_thread) {
8754 pr_warn("%s: could not start resync thread...\n",
8756 /* leave the spares where they are, it shouldn't hurt */
8757 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8758 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8759 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8760 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8761 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8762 wake_up(&resync_wait);
8763 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8765 if (mddev->sysfs_action)
8766 sysfs_notify_dirent_safe(mddev->sysfs_action);
8768 md_wakeup_thread(mddev->sync_thread);
8769 sysfs_notify_dirent_safe(mddev->sysfs_action);
8770 md_new_event(mddev);
8774 * This routine is regularly called by all per-raid-array threads to
8775 * deal with generic issues like resync and super-block update.
8776 * Raid personalities that don't have a thread (linear/raid0) do not
8777 * need this as they never do any recovery or update the superblock.
8779 * It does not do any resync itself, but rather "forks" off other threads
8780 * to do that as needed.
8781 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8782 * "->recovery" and create a thread at ->sync_thread.
8783 * When the thread finishes it sets MD_RECOVERY_DONE
8784 * and wakeups up this thread which will reap the thread and finish up.
8785 * This thread also removes any faulty devices (with nr_pending == 0).
8787 * The overall approach is:
8788 * 1/ if the superblock needs updating, update it.
8789 * 2/ If a recovery thread is running, don't do anything else.
8790 * 3/ If recovery has finished, clean up, possibly marking spares active.
8791 * 4/ If there are any faulty devices, remove them.
8792 * 5/ If array is degraded, try to add spares devices
8793 * 6/ If array has spares or is not in-sync, start a resync thread.
8795 void md_check_recovery(struct mddev *mddev)
8797 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8798 /* Write superblock - thread that called mddev_suspend()
8799 * holds reconfig_mutex for us.
8801 set_bit(MD_UPDATING_SB, &mddev->flags);
8802 smp_mb__after_atomic();
8803 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8804 md_update_sb(mddev, 0);
8805 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8806 wake_up(&mddev->sb_wait);
8809 if (mddev->suspended)
8813 md_bitmap_daemon_work(mddev);
8815 if (signal_pending(current)) {
8816 if (mddev->pers->sync_request && !mddev->external) {
8817 pr_debug("md: %s in immediate safe mode\n",
8819 mddev->safemode = 2;
8821 flush_signals(current);
8824 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8827 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8828 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8829 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8830 (mddev->external == 0 && mddev->safemode == 1) ||
8831 (mddev->safemode == 2
8832 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8836 if (mddev_trylock(mddev)) {
8839 if (!mddev->external && mddev->safemode == 1)
8840 mddev->safemode = 0;
8843 struct md_rdev *rdev;
8844 if (!mddev->external && mddev->in_sync)
8845 /* 'Blocked' flag not needed as failed devices
8846 * will be recorded if array switched to read/write.
8847 * Leaving it set will prevent the device
8848 * from being removed.
8850 rdev_for_each(rdev, mddev)
8851 clear_bit(Blocked, &rdev->flags);
8852 /* On a read-only array we can:
8853 * - remove failed devices
8854 * - add already-in_sync devices if the array itself
8856 * As we only add devices that are already in-sync,
8857 * we can activate the spares immediately.
8859 remove_and_add_spares(mddev, NULL);
8860 /* There is no thread, but we need to call
8861 * ->spare_active and clear saved_raid_disk
8863 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8864 md_reap_sync_thread(mddev);
8865 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8866 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8867 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8871 if (mddev_is_clustered(mddev)) {
8872 struct md_rdev *rdev;
8873 /* kick the device if another node issued a
8876 rdev_for_each(rdev, mddev) {
8877 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8878 rdev->raid_disk < 0)
8879 md_kick_rdev_from_array(rdev);
8883 if (!mddev->external && !mddev->in_sync) {
8884 spin_lock(&mddev->lock);
8886 spin_unlock(&mddev->lock);
8889 if (mddev->sb_flags)
8890 md_update_sb(mddev, 0);
8892 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8893 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8894 /* resync/recovery still happening */
8895 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8898 if (mddev->sync_thread) {
8899 md_reap_sync_thread(mddev);
8902 /* Set RUNNING before clearing NEEDED to avoid
8903 * any transients in the value of "sync_action".
8905 mddev->curr_resync_completed = 0;
8906 spin_lock(&mddev->lock);
8907 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8908 spin_unlock(&mddev->lock);
8909 /* Clear some bits that don't mean anything, but
8912 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8913 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8915 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8916 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8918 /* no recovery is running.
8919 * remove any failed drives, then
8920 * add spares if possible.
8921 * Spares are also removed and re-added, to allow
8922 * the personality to fail the re-add.
8925 if (mddev->reshape_position != MaxSector) {
8926 if (mddev->pers->check_reshape == NULL ||
8927 mddev->pers->check_reshape(mddev) != 0)
8928 /* Cannot proceed */
8930 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8931 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8932 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8933 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8934 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8935 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8936 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8937 } else if (mddev->recovery_cp < MaxSector) {
8938 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8939 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8940 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8941 /* nothing to be done ... */
8944 if (mddev->pers->sync_request) {
8946 /* We are adding a device or devices to an array
8947 * which has the bitmap stored on all devices.
8948 * So make sure all bitmap pages get written
8950 md_bitmap_write_all(mddev->bitmap);
8952 INIT_WORK(&mddev->del_work, md_start_sync);
8953 queue_work(md_misc_wq, &mddev->del_work);
8957 if (!mddev->sync_thread) {
8958 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8959 wake_up(&resync_wait);
8960 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8962 if (mddev->sysfs_action)
8963 sysfs_notify_dirent_safe(mddev->sysfs_action);
8966 wake_up(&mddev->sb_wait);
8967 mddev_unlock(mddev);
8970 EXPORT_SYMBOL(md_check_recovery);
8972 void md_reap_sync_thread(struct mddev *mddev)
8974 struct md_rdev *rdev;
8976 /* resync has finished, collect result */
8977 md_unregister_thread(&mddev->sync_thread);
8978 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8979 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8981 /* activate any spares */
8982 if (mddev->pers->spare_active(mddev)) {
8983 sysfs_notify(&mddev->kobj, NULL,
8985 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8988 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8989 mddev->pers->finish_reshape)
8990 mddev->pers->finish_reshape(mddev);
8992 /* If array is no-longer degraded, then any saved_raid_disk
8993 * information must be scrapped.
8995 if (!mddev->degraded)
8996 rdev_for_each(rdev, mddev)
8997 rdev->saved_raid_disk = -1;
8999 md_update_sb(mddev, 1);
9000 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9001 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9003 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9004 md_cluster_ops->resync_finish(mddev);
9005 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9006 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9007 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9008 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9009 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9010 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9011 wake_up(&resync_wait);
9012 /* flag recovery needed just to double check */
9013 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9014 sysfs_notify_dirent_safe(mddev->sysfs_action);
9015 md_new_event(mddev);
9016 if (mddev->event_work.func)
9017 queue_work(md_misc_wq, &mddev->event_work);
9019 EXPORT_SYMBOL(md_reap_sync_thread);
9021 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9023 sysfs_notify_dirent_safe(rdev->sysfs_state);
9024 wait_event_timeout(rdev->blocked_wait,
9025 !test_bit(Blocked, &rdev->flags) &&
9026 !test_bit(BlockedBadBlocks, &rdev->flags),
9027 msecs_to_jiffies(5000));
9028 rdev_dec_pending(rdev, mddev);
9030 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9032 void md_finish_reshape(struct mddev *mddev)
9034 /* called be personality module when reshape completes. */
9035 struct md_rdev *rdev;
9037 rdev_for_each(rdev, mddev) {
9038 if (rdev->data_offset > rdev->new_data_offset)
9039 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9041 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9042 rdev->data_offset = rdev->new_data_offset;
9045 EXPORT_SYMBOL(md_finish_reshape);
9047 /* Bad block management */
9049 /* Returns 1 on success, 0 on failure */
9050 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9053 struct mddev *mddev = rdev->mddev;
9056 s += rdev->new_data_offset;
9058 s += rdev->data_offset;
9059 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9061 /* Make sure they get written out promptly */
9062 if (test_bit(ExternalBbl, &rdev->flags))
9063 sysfs_notify(&rdev->kobj, NULL,
9064 "unacknowledged_bad_blocks");
9065 sysfs_notify_dirent_safe(rdev->sysfs_state);
9066 set_mask_bits(&mddev->sb_flags, 0,
9067 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9068 md_wakeup_thread(rdev->mddev->thread);
9073 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9075 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9080 s += rdev->new_data_offset;
9082 s += rdev->data_offset;
9083 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9084 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9085 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9088 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9090 static int md_notify_reboot(struct notifier_block *this,
9091 unsigned long code, void *x)
9093 struct list_head *tmp;
9094 struct mddev *mddev;
9097 for_each_mddev(mddev, tmp) {
9098 if (mddev_trylock(mddev)) {
9100 __md_stop_writes(mddev);
9101 if (mddev->persistent)
9102 mddev->safemode = 2;
9103 mddev_unlock(mddev);
9108 * certain more exotic SCSI devices are known to be
9109 * volatile wrt too early system reboots. While the
9110 * right place to handle this issue is the given
9111 * driver, we do want to have a safe RAID driver ...
9119 static struct notifier_block md_notifier = {
9120 .notifier_call = md_notify_reboot,
9122 .priority = INT_MAX, /* before any real devices */
9125 static void md_geninit(void)
9127 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9129 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9132 static int __init md_init(void)
9136 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9140 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9144 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9147 if ((ret = register_blkdev(0, "mdp")) < 0)
9151 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9152 md_probe, NULL, NULL);
9153 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9154 md_probe, NULL, NULL);
9156 register_reboot_notifier(&md_notifier);
9157 raid_table_header = register_sysctl_table(raid_root_table);
9163 unregister_blkdev(MD_MAJOR, "md");
9165 destroy_workqueue(md_misc_wq);
9167 destroy_workqueue(md_wq);
9172 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9174 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9175 struct md_rdev *rdev2;
9177 char b[BDEVNAME_SIZE];
9180 * If size is changed in another node then we need to
9181 * do resize as well.
9183 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9184 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9186 pr_info("md-cluster: resize failed\n");
9188 md_bitmap_update_sb(mddev->bitmap);
9191 /* Check for change of roles in the active devices */
9192 rdev_for_each(rdev2, mddev) {
9193 if (test_bit(Faulty, &rdev2->flags))
9196 /* Check if the roles changed */
9197 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9199 if (test_bit(Candidate, &rdev2->flags)) {
9200 if (role == 0xfffe) {
9201 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9202 md_kick_rdev_from_array(rdev2);
9206 clear_bit(Candidate, &rdev2->flags);
9209 if (role != rdev2->raid_disk) {
9211 if (rdev2->raid_disk == -1 && role != 0xffff) {
9212 rdev2->saved_raid_disk = role;
9213 ret = remove_and_add_spares(mddev, rdev2);
9214 pr_info("Activated spare: %s\n",
9215 bdevname(rdev2->bdev,b));
9216 /* wakeup mddev->thread here, so array could
9217 * perform resync with the new activated disk */
9218 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9219 md_wakeup_thread(mddev->thread);
9223 * We just want to do the minimum to mark the disk
9224 * as faulty. The recovery is performed by the
9225 * one who initiated the error.
9227 if ((role == 0xfffe) || (role == 0xfffd)) {
9228 md_error(mddev, rdev2);
9229 clear_bit(Blocked, &rdev2->flags);
9234 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9235 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9237 /* Finally set the event to be up to date */
9238 mddev->events = le64_to_cpu(sb->events);
9241 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9244 struct page *swapout = rdev->sb_page;
9245 struct mdp_superblock_1 *sb;
9247 /* Store the sb page of the rdev in the swapout temporary
9248 * variable in case we err in the future
9250 rdev->sb_page = NULL;
9251 err = alloc_disk_sb(rdev);
9253 ClearPageUptodate(rdev->sb_page);
9254 rdev->sb_loaded = 0;
9255 err = super_types[mddev->major_version].
9256 load_super(rdev, NULL, mddev->minor_version);
9259 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9260 __func__, __LINE__, rdev->desc_nr, err);
9262 put_page(rdev->sb_page);
9263 rdev->sb_page = swapout;
9264 rdev->sb_loaded = 1;
9268 sb = page_address(rdev->sb_page);
9269 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9273 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9274 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9276 /* The other node finished recovery, call spare_active to set
9277 * device In_sync and mddev->degraded
9279 if (rdev->recovery_offset == MaxSector &&
9280 !test_bit(In_sync, &rdev->flags) &&
9281 mddev->pers->spare_active(mddev))
9282 sysfs_notify(&mddev->kobj, NULL, "degraded");
9288 void md_reload_sb(struct mddev *mddev, int nr)
9290 struct md_rdev *rdev;
9294 rdev_for_each_rcu(rdev, mddev) {
9295 if (rdev->desc_nr == nr)
9299 if (!rdev || rdev->desc_nr != nr) {
9300 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9304 err = read_rdev(mddev, rdev);
9308 check_sb_changes(mddev, rdev);
9310 /* Read all rdev's to update recovery_offset */
9311 rdev_for_each_rcu(rdev, mddev) {
9312 if (!test_bit(Faulty, &rdev->flags))
9313 read_rdev(mddev, rdev);
9316 EXPORT_SYMBOL(md_reload_sb);
9321 * Searches all registered partitions for autorun RAID arrays
9325 static DEFINE_MUTEX(detected_devices_mutex);
9326 static LIST_HEAD(all_detected_devices);
9327 struct detected_devices_node {
9328 struct list_head list;
9332 void md_autodetect_dev(dev_t dev)
9334 struct detected_devices_node *node_detected_dev;
9336 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9337 if (node_detected_dev) {
9338 node_detected_dev->dev = dev;
9339 mutex_lock(&detected_devices_mutex);
9340 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9341 mutex_unlock(&detected_devices_mutex);
9345 static void autostart_arrays(int part)
9347 struct md_rdev *rdev;
9348 struct detected_devices_node *node_detected_dev;
9350 int i_scanned, i_passed;
9355 pr_info("md: Autodetecting RAID arrays.\n");
9357 mutex_lock(&detected_devices_mutex);
9358 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9360 node_detected_dev = list_entry(all_detected_devices.next,
9361 struct detected_devices_node, list);
9362 list_del(&node_detected_dev->list);
9363 dev = node_detected_dev->dev;
9364 kfree(node_detected_dev);
9365 mutex_unlock(&detected_devices_mutex);
9366 rdev = md_import_device(dev,0, 90);
9367 mutex_lock(&detected_devices_mutex);
9371 if (test_bit(Faulty, &rdev->flags))
9374 set_bit(AutoDetected, &rdev->flags);
9375 list_add(&rdev->same_set, &pending_raid_disks);
9378 mutex_unlock(&detected_devices_mutex);
9380 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9382 autorun_devices(part);
9385 #endif /* !MODULE */
9387 static __exit void md_exit(void)
9389 struct mddev *mddev;
9390 struct list_head *tmp;
9393 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9394 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9396 unregister_blkdev(MD_MAJOR,"md");
9397 unregister_blkdev(mdp_major, "mdp");
9398 unregister_reboot_notifier(&md_notifier);
9399 unregister_sysctl_table(raid_table_header);
9401 /* We cannot unload the modules while some process is
9402 * waiting for us in select() or poll() - wake them up
9405 while (waitqueue_active(&md_event_waiters)) {
9406 /* not safe to leave yet */
9407 wake_up(&md_event_waiters);
9411 remove_proc_entry("mdstat", NULL);
9413 for_each_mddev(mddev, tmp) {
9414 export_array(mddev);
9416 mddev->hold_active = 0;
9418 * for_each_mddev() will call mddev_put() at the end of each
9419 * iteration. As the mddev is now fully clear, this will
9420 * schedule the mddev for destruction by a workqueue, and the
9421 * destroy_workqueue() below will wait for that to complete.
9424 destroy_workqueue(md_misc_wq);
9425 destroy_workqueue(md_wq);
9428 subsys_initcall(md_init);
9429 module_exit(md_exit)
9431 static int get_ro(char *buffer, const struct kernel_param *kp)
9433 return sprintf(buffer, "%d", start_readonly);
9435 static int set_ro(const char *val, const struct kernel_param *kp)
9437 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9440 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9441 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9442 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9443 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9445 MODULE_LICENSE("GPL");
9446 MODULE_DESCRIPTION("MD RAID framework");
9448 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);