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;
338 blk_queue_split(q, &bio);
340 if (mddev == NULL || mddev->pers == NULL) {
342 return BLK_QC_T_NONE;
344 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
345 if (bio_sectors(bio) != 0)
346 bio->bi_status = BLK_STS_IOERR;
348 return BLK_QC_T_NONE;
352 * save the sectors now since our bio can
353 * go away inside make_request
355 sectors = bio_sectors(bio);
356 /* bio could be mergeable after passing to underlayer */
357 bio->bi_opf &= ~REQ_NOMERGE;
359 md_handle_request(mddev, bio);
362 part_stat_inc(&mddev->gendisk->part0, ios[sgrp]);
363 part_stat_add(&mddev->gendisk->part0, sectors[sgrp], sectors);
366 return BLK_QC_T_NONE;
369 /* mddev_suspend makes sure no new requests are submitted
370 * to the device, and that any requests that have been submitted
371 * are completely handled.
372 * Once mddev_detach() is called and completes, the module will be
375 void mddev_suspend(struct mddev *mddev)
377 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
378 lockdep_assert_held(&mddev->reconfig_mutex);
379 if (mddev->suspended++)
382 wake_up(&mddev->sb_wait);
383 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
384 smp_mb__after_atomic();
385 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
386 mddev->pers->quiesce(mddev, 1);
387 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
388 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
390 del_timer_sync(&mddev->safemode_timer);
392 EXPORT_SYMBOL_GPL(mddev_suspend);
394 void mddev_resume(struct mddev *mddev)
396 lockdep_assert_held(&mddev->reconfig_mutex);
397 if (--mddev->suspended)
399 wake_up(&mddev->sb_wait);
400 mddev->pers->quiesce(mddev, 0);
402 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
403 md_wakeup_thread(mddev->thread);
404 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
406 EXPORT_SYMBOL_GPL(mddev_resume);
408 int mddev_congested(struct mddev *mddev, int bits)
410 struct md_personality *pers = mddev->pers;
414 if (mddev->suspended)
416 else if (pers && pers->congested)
417 ret = pers->congested(mddev, bits);
421 EXPORT_SYMBOL_GPL(mddev_congested);
422 static int md_congested(void *data, int bits)
424 struct mddev *mddev = data;
425 return mddev_congested(mddev, bits);
429 * Generic flush handling for md
431 static void submit_flushes(struct work_struct *ws)
433 struct flush_info *fi = container_of(ws, struct flush_info, flush_work);
434 struct mddev *mddev = fi->mddev;
435 struct bio *bio = fi->bio;
437 bio->bi_opf &= ~REQ_PREFLUSH;
438 md_handle_request(mddev, bio);
440 mempool_free(fi, mddev->flush_pool);
443 static void md_end_flush(struct bio *fbio)
445 struct flush_bio *fb = fbio->bi_private;
446 struct md_rdev *rdev = fb->rdev;
447 struct flush_info *fi = fb->fi;
448 struct bio *bio = fi->bio;
449 struct mddev *mddev = fi->mddev;
451 rdev_dec_pending(rdev, mddev);
453 if (atomic_dec_and_test(&fi->flush_pending)) {
454 if (bio->bi_iter.bi_size == 0) {
455 /* an empty barrier - all done */
457 mempool_free(fi, mddev->flush_pool);
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 */
515 mempool_free(fi, mddev->flush_pool);
517 INIT_WORK(&fi->flush_work, submit_flushes);
518 queue_work(md_wq, &fi->flush_work);
522 EXPORT_SYMBOL(md_flush_request);
524 static inline struct mddev *mddev_get(struct mddev *mddev)
526 atomic_inc(&mddev->active);
530 static void mddev_delayed_delete(struct work_struct *ws);
532 static void mddev_put(struct mddev *mddev)
534 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
536 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
537 mddev->ctime == 0 && !mddev->hold_active) {
538 /* Array is not configured at all, and not held active,
540 list_del_init(&mddev->all_mddevs);
543 * Call queue_work inside the spinlock so that
544 * flush_workqueue() after mddev_find will succeed in waiting
545 * for the work to be done.
547 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
548 queue_work(md_misc_wq, &mddev->del_work);
550 spin_unlock(&all_mddevs_lock);
553 static void md_safemode_timeout(struct timer_list *t);
555 void mddev_init(struct mddev *mddev)
557 kobject_init(&mddev->kobj, &md_ktype);
558 mutex_init(&mddev->open_mutex);
559 mutex_init(&mddev->reconfig_mutex);
560 mutex_init(&mddev->bitmap_info.mutex);
561 INIT_LIST_HEAD(&mddev->disks);
562 INIT_LIST_HEAD(&mddev->all_mddevs);
563 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
564 atomic_set(&mddev->active, 1);
565 atomic_set(&mddev->openers, 0);
566 atomic_set(&mddev->active_io, 0);
567 spin_lock_init(&mddev->lock);
568 init_waitqueue_head(&mddev->sb_wait);
569 init_waitqueue_head(&mddev->recovery_wait);
570 mddev->reshape_position = MaxSector;
571 mddev->reshape_backwards = 0;
572 mddev->last_sync_action = "none";
573 mddev->resync_min = 0;
574 mddev->resync_max = MaxSector;
575 mddev->level = LEVEL_NONE;
577 EXPORT_SYMBOL_GPL(mddev_init);
579 static struct mddev *mddev_find(dev_t unit)
581 struct mddev *mddev, *new = NULL;
583 if (unit && MAJOR(unit) != MD_MAJOR)
584 unit &= ~((1<<MdpMinorShift)-1);
587 spin_lock(&all_mddevs_lock);
590 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
591 if (mddev->unit == unit) {
593 spin_unlock(&all_mddevs_lock);
599 list_add(&new->all_mddevs, &all_mddevs);
600 spin_unlock(&all_mddevs_lock);
601 new->hold_active = UNTIL_IOCTL;
605 /* find an unused unit number */
606 static int next_minor = 512;
607 int start = next_minor;
611 dev = MKDEV(MD_MAJOR, next_minor);
613 if (next_minor > MINORMASK)
615 if (next_minor == start) {
616 /* Oh dear, all in use. */
617 spin_unlock(&all_mddevs_lock);
623 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
624 if (mddev->unit == dev) {
630 new->md_minor = MINOR(dev);
631 new->hold_active = UNTIL_STOP;
632 list_add(&new->all_mddevs, &all_mddevs);
633 spin_unlock(&all_mddevs_lock);
636 spin_unlock(&all_mddevs_lock);
638 new = kzalloc(sizeof(*new), GFP_KERNEL);
643 if (MAJOR(unit) == MD_MAJOR)
644 new->md_minor = MINOR(unit);
646 new->md_minor = MINOR(unit) >> MdpMinorShift;
653 static struct attribute_group md_redundancy_group;
655 void mddev_unlock(struct mddev *mddev)
657 if (mddev->to_remove) {
658 /* These cannot be removed under reconfig_mutex as
659 * an access to the files will try to take reconfig_mutex
660 * while holding the file unremovable, which leads to
662 * So hold set sysfs_active while the remove in happeing,
663 * and anything else which might set ->to_remove or my
664 * otherwise change the sysfs namespace will fail with
665 * -EBUSY if sysfs_active is still set.
666 * We set sysfs_active under reconfig_mutex and elsewhere
667 * test it under the same mutex to ensure its correct value
670 struct attribute_group *to_remove = mddev->to_remove;
671 mddev->to_remove = NULL;
672 mddev->sysfs_active = 1;
673 mutex_unlock(&mddev->reconfig_mutex);
675 if (mddev->kobj.sd) {
676 if (to_remove != &md_redundancy_group)
677 sysfs_remove_group(&mddev->kobj, to_remove);
678 if (mddev->pers == NULL ||
679 mddev->pers->sync_request == NULL) {
680 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
681 if (mddev->sysfs_action)
682 sysfs_put(mddev->sysfs_action);
683 mddev->sysfs_action = NULL;
686 mddev->sysfs_active = 0;
688 mutex_unlock(&mddev->reconfig_mutex);
690 /* As we've dropped the mutex we need a spinlock to
691 * make sure the thread doesn't disappear
693 spin_lock(&pers_lock);
694 md_wakeup_thread(mddev->thread);
695 wake_up(&mddev->sb_wait);
696 spin_unlock(&pers_lock);
698 EXPORT_SYMBOL_GPL(mddev_unlock);
700 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
702 struct md_rdev *rdev;
704 rdev_for_each_rcu(rdev, mddev)
705 if (rdev->desc_nr == nr)
710 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
712 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
714 struct md_rdev *rdev;
716 rdev_for_each(rdev, mddev)
717 if (rdev->bdev->bd_dev == dev)
723 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
725 struct md_rdev *rdev;
727 rdev_for_each_rcu(rdev, mddev)
728 if (rdev->bdev->bd_dev == dev)
733 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
735 static struct md_personality *find_pers(int level, char *clevel)
737 struct md_personality *pers;
738 list_for_each_entry(pers, &pers_list, list) {
739 if (level != LEVEL_NONE && pers->level == level)
741 if (strcmp(pers->name, clevel)==0)
747 /* return the offset of the super block in 512byte sectors */
748 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
750 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
751 return MD_NEW_SIZE_SECTORS(num_sectors);
754 static int alloc_disk_sb(struct md_rdev *rdev)
756 rdev->sb_page = alloc_page(GFP_KERNEL);
762 void md_rdev_clear(struct md_rdev *rdev)
765 put_page(rdev->sb_page);
767 rdev->sb_page = NULL;
772 put_page(rdev->bb_page);
773 rdev->bb_page = NULL;
775 badblocks_exit(&rdev->badblocks);
777 EXPORT_SYMBOL_GPL(md_rdev_clear);
779 static void super_written(struct bio *bio)
781 struct md_rdev *rdev = bio->bi_private;
782 struct mddev *mddev = rdev->mddev;
784 if (bio->bi_status) {
785 pr_err("md: super_written gets error=%d\n", bio->bi_status);
786 md_error(mddev, rdev);
787 if (!test_bit(Faulty, &rdev->flags)
788 && (bio->bi_opf & MD_FAILFAST)) {
789 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
790 set_bit(LastDev, &rdev->flags);
793 clear_bit(LastDev, &rdev->flags);
795 if (atomic_dec_and_test(&mddev->pending_writes))
796 wake_up(&mddev->sb_wait);
797 rdev_dec_pending(rdev, mddev);
801 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
802 sector_t sector, int size, struct page *page)
804 /* write first size bytes of page to sector of rdev
805 * Increment mddev->pending_writes before returning
806 * and decrement it on completion, waking up sb_wait
807 * if zero is reached.
808 * If an error occurred, call md_error
816 if (test_bit(Faulty, &rdev->flags))
819 bio = md_bio_alloc_sync(mddev);
821 atomic_inc(&rdev->nr_pending);
823 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
824 bio->bi_iter.bi_sector = sector;
825 bio_add_page(bio, page, size, 0);
826 bio->bi_private = rdev;
827 bio->bi_end_io = super_written;
829 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
830 test_bit(FailFast, &rdev->flags) &&
831 !test_bit(LastDev, &rdev->flags))
833 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
835 atomic_inc(&mddev->pending_writes);
839 int md_super_wait(struct mddev *mddev)
841 /* wait for all superblock writes that were scheduled to complete */
842 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
843 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
848 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
849 struct page *page, int op, int op_flags, bool metadata_op)
851 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
854 if (metadata_op && rdev->meta_bdev)
855 bio_set_dev(bio, rdev->meta_bdev);
857 bio_set_dev(bio, rdev->bdev);
858 bio_set_op_attrs(bio, op, op_flags);
860 bio->bi_iter.bi_sector = sector + rdev->sb_start;
861 else if (rdev->mddev->reshape_position != MaxSector &&
862 (rdev->mddev->reshape_backwards ==
863 (sector >= rdev->mddev->reshape_position)))
864 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
866 bio->bi_iter.bi_sector = sector + rdev->data_offset;
867 bio_add_page(bio, page, size, 0);
869 submit_bio_wait(bio);
871 ret = !bio->bi_status;
875 EXPORT_SYMBOL_GPL(sync_page_io);
877 static int read_disk_sb(struct md_rdev *rdev, int size)
879 char b[BDEVNAME_SIZE];
884 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
890 pr_err("md: disabled device %s, could not read superblock.\n",
891 bdevname(rdev->bdev,b));
895 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
897 return sb1->set_uuid0 == sb2->set_uuid0 &&
898 sb1->set_uuid1 == sb2->set_uuid1 &&
899 sb1->set_uuid2 == sb2->set_uuid2 &&
900 sb1->set_uuid3 == sb2->set_uuid3;
903 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
906 mdp_super_t *tmp1, *tmp2;
908 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
909 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
911 if (!tmp1 || !tmp2) {
920 * nr_disks is not constant
925 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
932 static u32 md_csum_fold(u32 csum)
934 csum = (csum & 0xffff) + (csum >> 16);
935 return (csum & 0xffff) + (csum >> 16);
938 static unsigned int calc_sb_csum(mdp_super_t *sb)
941 u32 *sb32 = (u32*)sb;
943 unsigned int disk_csum, csum;
945 disk_csum = sb->sb_csum;
948 for (i = 0; i < MD_SB_BYTES/4 ; i++)
950 csum = (newcsum & 0xffffffff) + (newcsum>>32);
953 /* This used to use csum_partial, which was wrong for several
954 * reasons including that different results are returned on
955 * different architectures. It isn't critical that we get exactly
956 * the same return value as before (we always csum_fold before
957 * testing, and that removes any differences). However as we
958 * know that csum_partial always returned a 16bit value on
959 * alphas, do a fold to maximise conformity to previous behaviour.
961 sb->sb_csum = md_csum_fold(disk_csum);
963 sb->sb_csum = disk_csum;
969 * Handle superblock details.
970 * We want to be able to handle multiple superblock formats
971 * so we have a common interface to them all, and an array of
972 * different handlers.
973 * We rely on user-space to write the initial superblock, and support
974 * reading and updating of superblocks.
975 * Interface methods are:
976 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
977 * loads and validates a superblock on dev.
978 * if refdev != NULL, compare superblocks on both devices
980 * 0 - dev has a superblock that is compatible with refdev
981 * 1 - dev has a superblock that is compatible and newer than refdev
982 * so dev should be used as the refdev in future
983 * -EINVAL superblock incompatible or invalid
984 * -othererror e.g. -EIO
986 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
987 * Verify that dev is acceptable into mddev.
988 * The first time, mddev->raid_disks will be 0, and data from
989 * dev should be merged in. Subsequent calls check that dev
990 * is new enough. Return 0 or -EINVAL
992 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
993 * Update the superblock for rdev with data in mddev
994 * This does not write to disc.
1000 struct module *owner;
1001 int (*load_super)(struct md_rdev *rdev,
1002 struct md_rdev *refdev,
1004 int (*validate_super)(struct mddev *mddev,
1005 struct md_rdev *rdev);
1006 void (*sync_super)(struct mddev *mddev,
1007 struct md_rdev *rdev);
1008 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1009 sector_t num_sectors);
1010 int (*allow_new_offset)(struct md_rdev *rdev,
1011 unsigned long long new_offset);
1015 * Check that the given mddev has no bitmap.
1017 * This function is called from the run method of all personalities that do not
1018 * support bitmaps. It prints an error message and returns non-zero if mddev
1019 * has a bitmap. Otherwise, it returns 0.
1022 int md_check_no_bitmap(struct mddev *mddev)
1024 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1026 pr_warn("%s: bitmaps are not supported for %s\n",
1027 mdname(mddev), mddev->pers->name);
1030 EXPORT_SYMBOL(md_check_no_bitmap);
1033 * load_super for 0.90.0
1035 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1037 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1042 * Calculate the position of the superblock (512byte sectors),
1043 * it's at the end of the disk.
1045 * It also happens to be a multiple of 4Kb.
1047 rdev->sb_start = calc_dev_sboffset(rdev);
1049 ret = read_disk_sb(rdev, MD_SB_BYTES);
1055 bdevname(rdev->bdev, b);
1056 sb = page_address(rdev->sb_page);
1058 if (sb->md_magic != MD_SB_MAGIC) {
1059 pr_warn("md: invalid raid superblock magic on %s\n", b);
1063 if (sb->major_version != 0 ||
1064 sb->minor_version < 90 ||
1065 sb->minor_version > 91) {
1066 pr_warn("Bad version number %d.%d on %s\n",
1067 sb->major_version, sb->minor_version, b);
1071 if (sb->raid_disks <= 0)
1074 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1075 pr_warn("md: invalid superblock checksum on %s\n", b);
1079 rdev->preferred_minor = sb->md_minor;
1080 rdev->data_offset = 0;
1081 rdev->new_data_offset = 0;
1082 rdev->sb_size = MD_SB_BYTES;
1083 rdev->badblocks.shift = -1;
1085 if (sb->level == LEVEL_MULTIPATH)
1088 rdev->desc_nr = sb->this_disk.number;
1094 mdp_super_t *refsb = page_address(refdev->sb_page);
1095 if (!md_uuid_equal(refsb, sb)) {
1096 pr_warn("md: %s has different UUID to %s\n",
1097 b, bdevname(refdev->bdev,b2));
1100 if (!md_sb_equal(refsb, sb)) {
1101 pr_warn("md: %s has same UUID but different superblock to %s\n",
1102 b, bdevname(refdev->bdev, b2));
1106 ev2 = md_event(refsb);
1112 rdev->sectors = rdev->sb_start;
1113 /* Limit to 4TB as metadata cannot record more than that.
1114 * (not needed for Linear and RAID0 as metadata doesn't
1117 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1119 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1121 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1122 /* "this cannot possibly happen" ... */
1130 * validate_super for 0.90.0
1132 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1135 mdp_super_t *sb = page_address(rdev->sb_page);
1136 __u64 ev1 = md_event(sb);
1138 rdev->raid_disk = -1;
1139 clear_bit(Faulty, &rdev->flags);
1140 clear_bit(In_sync, &rdev->flags);
1141 clear_bit(Bitmap_sync, &rdev->flags);
1142 clear_bit(WriteMostly, &rdev->flags);
1144 if (mddev->raid_disks == 0) {
1145 mddev->major_version = 0;
1146 mddev->minor_version = sb->minor_version;
1147 mddev->patch_version = sb->patch_version;
1148 mddev->external = 0;
1149 mddev->chunk_sectors = sb->chunk_size >> 9;
1150 mddev->ctime = sb->ctime;
1151 mddev->utime = sb->utime;
1152 mddev->level = sb->level;
1153 mddev->clevel[0] = 0;
1154 mddev->layout = sb->layout;
1155 mddev->raid_disks = sb->raid_disks;
1156 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1157 mddev->events = ev1;
1158 mddev->bitmap_info.offset = 0;
1159 mddev->bitmap_info.space = 0;
1160 /* bitmap can use 60 K after the 4K superblocks */
1161 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1162 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1163 mddev->reshape_backwards = 0;
1165 if (mddev->minor_version >= 91) {
1166 mddev->reshape_position = sb->reshape_position;
1167 mddev->delta_disks = sb->delta_disks;
1168 mddev->new_level = sb->new_level;
1169 mddev->new_layout = sb->new_layout;
1170 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1171 if (mddev->delta_disks < 0)
1172 mddev->reshape_backwards = 1;
1174 mddev->reshape_position = MaxSector;
1175 mddev->delta_disks = 0;
1176 mddev->new_level = mddev->level;
1177 mddev->new_layout = mddev->layout;
1178 mddev->new_chunk_sectors = mddev->chunk_sectors;
1181 if (sb->state & (1<<MD_SB_CLEAN))
1182 mddev->recovery_cp = MaxSector;
1184 if (sb->events_hi == sb->cp_events_hi &&
1185 sb->events_lo == sb->cp_events_lo) {
1186 mddev->recovery_cp = sb->recovery_cp;
1188 mddev->recovery_cp = 0;
1191 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1192 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1193 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1194 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1196 mddev->max_disks = MD_SB_DISKS;
1198 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1199 mddev->bitmap_info.file == NULL) {
1200 mddev->bitmap_info.offset =
1201 mddev->bitmap_info.default_offset;
1202 mddev->bitmap_info.space =
1203 mddev->bitmap_info.default_space;
1206 } else if (mddev->pers == NULL) {
1207 /* Insist on good event counter while assembling, except
1208 * for spares (which don't need an event count) */
1210 if (sb->disks[rdev->desc_nr].state & (
1211 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1212 if (ev1 < mddev->events)
1214 } else if (mddev->bitmap) {
1215 /* if adding to array with a bitmap, then we can accept an
1216 * older device ... but not too old.
1218 if (ev1 < mddev->bitmap->events_cleared)
1220 if (ev1 < mddev->events)
1221 set_bit(Bitmap_sync, &rdev->flags);
1223 if (ev1 < mddev->events)
1224 /* just a hot-add of a new device, leave raid_disk at -1 */
1228 if (mddev->level != LEVEL_MULTIPATH) {
1229 desc = sb->disks + rdev->desc_nr;
1231 if (desc->state & (1<<MD_DISK_FAULTY))
1232 set_bit(Faulty, &rdev->flags);
1233 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1234 desc->raid_disk < mddev->raid_disks */) {
1235 set_bit(In_sync, &rdev->flags);
1236 rdev->raid_disk = desc->raid_disk;
1237 rdev->saved_raid_disk = desc->raid_disk;
1238 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1239 /* active but not in sync implies recovery up to
1240 * reshape position. We don't know exactly where
1241 * that is, so set to zero for now */
1242 if (mddev->minor_version >= 91) {
1243 rdev->recovery_offset = 0;
1244 rdev->raid_disk = desc->raid_disk;
1247 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1248 set_bit(WriteMostly, &rdev->flags);
1249 if (desc->state & (1<<MD_DISK_FAILFAST))
1250 set_bit(FailFast, &rdev->flags);
1251 } else /* MULTIPATH are always insync */
1252 set_bit(In_sync, &rdev->flags);
1257 * sync_super for 0.90.0
1259 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1262 struct md_rdev *rdev2;
1263 int next_spare = mddev->raid_disks;
1265 /* make rdev->sb match mddev data..
1268 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1269 * 3/ any empty disks < next_spare become removed
1271 * disks[0] gets initialised to REMOVED because
1272 * we cannot be sure from other fields if it has
1273 * been initialised or not.
1276 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1278 rdev->sb_size = MD_SB_BYTES;
1280 sb = page_address(rdev->sb_page);
1282 memset(sb, 0, sizeof(*sb));
1284 sb->md_magic = MD_SB_MAGIC;
1285 sb->major_version = mddev->major_version;
1286 sb->patch_version = mddev->patch_version;
1287 sb->gvalid_words = 0; /* ignored */
1288 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1289 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1290 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1291 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1293 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1294 sb->level = mddev->level;
1295 sb->size = mddev->dev_sectors / 2;
1296 sb->raid_disks = mddev->raid_disks;
1297 sb->md_minor = mddev->md_minor;
1298 sb->not_persistent = 0;
1299 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1301 sb->events_hi = (mddev->events>>32);
1302 sb->events_lo = (u32)mddev->events;
1304 if (mddev->reshape_position == MaxSector)
1305 sb->minor_version = 90;
1307 sb->minor_version = 91;
1308 sb->reshape_position = mddev->reshape_position;
1309 sb->new_level = mddev->new_level;
1310 sb->delta_disks = mddev->delta_disks;
1311 sb->new_layout = mddev->new_layout;
1312 sb->new_chunk = mddev->new_chunk_sectors << 9;
1314 mddev->minor_version = sb->minor_version;
1317 sb->recovery_cp = mddev->recovery_cp;
1318 sb->cp_events_hi = (mddev->events>>32);
1319 sb->cp_events_lo = (u32)mddev->events;
1320 if (mddev->recovery_cp == MaxSector)
1321 sb->state = (1<< MD_SB_CLEAN);
1323 sb->recovery_cp = 0;
1325 sb->layout = mddev->layout;
1326 sb->chunk_size = mddev->chunk_sectors << 9;
1328 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1329 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1331 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1332 rdev_for_each(rdev2, mddev) {
1335 int is_active = test_bit(In_sync, &rdev2->flags);
1337 if (rdev2->raid_disk >= 0 &&
1338 sb->minor_version >= 91)
1339 /* we have nowhere to store the recovery_offset,
1340 * but if it is not below the reshape_position,
1341 * we can piggy-back on that.
1344 if (rdev2->raid_disk < 0 ||
1345 test_bit(Faulty, &rdev2->flags))
1348 desc_nr = rdev2->raid_disk;
1350 desc_nr = next_spare++;
1351 rdev2->desc_nr = desc_nr;
1352 d = &sb->disks[rdev2->desc_nr];
1354 d->number = rdev2->desc_nr;
1355 d->major = MAJOR(rdev2->bdev->bd_dev);
1356 d->minor = MINOR(rdev2->bdev->bd_dev);
1358 d->raid_disk = rdev2->raid_disk;
1360 d->raid_disk = rdev2->desc_nr; /* compatibility */
1361 if (test_bit(Faulty, &rdev2->flags))
1362 d->state = (1<<MD_DISK_FAULTY);
1363 else if (is_active) {
1364 d->state = (1<<MD_DISK_ACTIVE);
1365 if (test_bit(In_sync, &rdev2->flags))
1366 d->state |= (1<<MD_DISK_SYNC);
1374 if (test_bit(WriteMostly, &rdev2->flags))
1375 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1376 if (test_bit(FailFast, &rdev2->flags))
1377 d->state |= (1<<MD_DISK_FAILFAST);
1379 /* now set the "removed" and "faulty" bits on any missing devices */
1380 for (i=0 ; i < mddev->raid_disks ; i++) {
1381 mdp_disk_t *d = &sb->disks[i];
1382 if (d->state == 0 && d->number == 0) {
1385 d->state = (1<<MD_DISK_REMOVED);
1386 d->state |= (1<<MD_DISK_FAULTY);
1390 sb->nr_disks = nr_disks;
1391 sb->active_disks = active;
1392 sb->working_disks = working;
1393 sb->failed_disks = failed;
1394 sb->spare_disks = spare;
1396 sb->this_disk = sb->disks[rdev->desc_nr];
1397 sb->sb_csum = calc_sb_csum(sb);
1401 * rdev_size_change for 0.90.0
1403 static unsigned long long
1404 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1406 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1407 return 0; /* component must fit device */
1408 if (rdev->mddev->bitmap_info.offset)
1409 return 0; /* can't move bitmap */
1410 rdev->sb_start = calc_dev_sboffset(rdev);
1411 if (!num_sectors || num_sectors > rdev->sb_start)
1412 num_sectors = rdev->sb_start;
1413 /* Limit to 4TB as metadata cannot record more than that.
1414 * 4TB == 2^32 KB, or 2*2^32 sectors.
1416 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1417 rdev->mddev->level >= 1)
1418 num_sectors = (sector_t)(2ULL << 32) - 2;
1420 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1422 } while (md_super_wait(rdev->mddev) < 0);
1427 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1429 /* non-zero offset changes not possible with v0.90 */
1430 return new_offset == 0;
1434 * version 1 superblock
1437 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1441 unsigned long long newcsum;
1442 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1443 __le32 *isuper = (__le32*)sb;
1445 disk_csum = sb->sb_csum;
1448 for (; size >= 4; size -= 4)
1449 newcsum += le32_to_cpu(*isuper++);
1452 newcsum += le16_to_cpu(*(__le16*) isuper);
1454 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1455 sb->sb_csum = disk_csum;
1456 return cpu_to_le32(csum);
1459 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1461 struct mdp_superblock_1 *sb;
1465 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1469 * Calculate the position of the superblock in 512byte sectors.
1470 * It is always aligned to a 4K boundary and
1471 * depeding on minor_version, it can be:
1472 * 0: At least 8K, but less than 12K, from end of device
1473 * 1: At start of device
1474 * 2: 4K from start of device.
1476 switch(minor_version) {
1478 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1480 sb_start &= ~(sector_t)(4*2-1);
1491 rdev->sb_start = sb_start;
1493 /* superblock is rarely larger than 1K, but it can be larger,
1494 * and it is safe to read 4k, so we do that
1496 ret = read_disk_sb(rdev, 4096);
1497 if (ret) return ret;
1499 sb = page_address(rdev->sb_page);
1501 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1502 sb->major_version != cpu_to_le32(1) ||
1503 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1504 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1505 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1508 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1509 pr_warn("md: invalid superblock checksum on %s\n",
1510 bdevname(rdev->bdev,b));
1513 if (le64_to_cpu(sb->data_size) < 10) {
1514 pr_warn("md: data_size too small on %s\n",
1515 bdevname(rdev->bdev,b));
1520 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1521 /* Some padding is non-zero, might be a new feature */
1524 rdev->preferred_minor = 0xffff;
1525 rdev->data_offset = le64_to_cpu(sb->data_offset);
1526 rdev->new_data_offset = rdev->data_offset;
1527 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1528 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1529 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1530 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1532 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1533 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1534 if (rdev->sb_size & bmask)
1535 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1538 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1541 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1544 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1547 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1549 if (!rdev->bb_page) {
1550 rdev->bb_page = alloc_page(GFP_KERNEL);
1554 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1555 rdev->badblocks.count == 0) {
1556 /* need to load the bad block list.
1557 * Currently we limit it to one page.
1563 int sectors = le16_to_cpu(sb->bblog_size);
1564 if (sectors > (PAGE_SIZE / 512))
1566 offset = le32_to_cpu(sb->bblog_offset);
1569 bb_sector = (long long)offset;
1570 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1571 rdev->bb_page, REQ_OP_READ, 0, true))
1573 bbp = (u64 *)page_address(rdev->bb_page);
1574 rdev->badblocks.shift = sb->bblog_shift;
1575 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1576 u64 bb = le64_to_cpu(*bbp);
1577 int count = bb & (0x3ff);
1578 u64 sector = bb >> 10;
1579 sector <<= sb->bblog_shift;
1580 count <<= sb->bblog_shift;
1583 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1586 } else if (sb->bblog_offset != 0)
1587 rdev->badblocks.shift = 0;
1589 if ((le32_to_cpu(sb->feature_map) &
1590 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1591 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1592 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1593 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1600 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1602 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1603 sb->level != refsb->level ||
1604 sb->layout != refsb->layout ||
1605 sb->chunksize != refsb->chunksize) {
1606 pr_warn("md: %s has strangely different superblock to %s\n",
1607 bdevname(rdev->bdev,b),
1608 bdevname(refdev->bdev,b2));
1611 ev1 = le64_to_cpu(sb->events);
1612 ev2 = le64_to_cpu(refsb->events);
1619 if (minor_version) {
1620 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1621 sectors -= rdev->data_offset;
1623 sectors = rdev->sb_start;
1624 if (sectors < le64_to_cpu(sb->data_size))
1626 rdev->sectors = le64_to_cpu(sb->data_size);
1630 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1632 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1633 __u64 ev1 = le64_to_cpu(sb->events);
1635 rdev->raid_disk = -1;
1636 clear_bit(Faulty, &rdev->flags);
1637 clear_bit(In_sync, &rdev->flags);
1638 clear_bit(Bitmap_sync, &rdev->flags);
1639 clear_bit(WriteMostly, &rdev->flags);
1641 if (mddev->raid_disks == 0) {
1642 mddev->major_version = 1;
1643 mddev->patch_version = 0;
1644 mddev->external = 0;
1645 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1646 mddev->ctime = le64_to_cpu(sb->ctime);
1647 mddev->utime = le64_to_cpu(sb->utime);
1648 mddev->level = le32_to_cpu(sb->level);
1649 mddev->clevel[0] = 0;
1650 mddev->layout = le32_to_cpu(sb->layout);
1651 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1652 mddev->dev_sectors = le64_to_cpu(sb->size);
1653 mddev->events = ev1;
1654 mddev->bitmap_info.offset = 0;
1655 mddev->bitmap_info.space = 0;
1656 /* Default location for bitmap is 1K after superblock
1657 * using 3K - total of 4K
1659 mddev->bitmap_info.default_offset = 1024 >> 9;
1660 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1661 mddev->reshape_backwards = 0;
1663 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1664 memcpy(mddev->uuid, sb->set_uuid, 16);
1666 mddev->max_disks = (4096-256)/2;
1668 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1669 mddev->bitmap_info.file == NULL) {
1670 mddev->bitmap_info.offset =
1671 (__s32)le32_to_cpu(sb->bitmap_offset);
1672 /* Metadata doesn't record how much space is available.
1673 * For 1.0, we assume we can use up to the superblock
1674 * if before, else to 4K beyond superblock.
1675 * For others, assume no change is possible.
1677 if (mddev->minor_version > 0)
1678 mddev->bitmap_info.space = 0;
1679 else if (mddev->bitmap_info.offset > 0)
1680 mddev->bitmap_info.space =
1681 8 - mddev->bitmap_info.offset;
1683 mddev->bitmap_info.space =
1684 -mddev->bitmap_info.offset;
1687 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1688 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1689 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1690 mddev->new_level = le32_to_cpu(sb->new_level);
1691 mddev->new_layout = le32_to_cpu(sb->new_layout);
1692 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1693 if (mddev->delta_disks < 0 ||
1694 (mddev->delta_disks == 0 &&
1695 (le32_to_cpu(sb->feature_map)
1696 & MD_FEATURE_RESHAPE_BACKWARDS)))
1697 mddev->reshape_backwards = 1;
1699 mddev->reshape_position = MaxSector;
1700 mddev->delta_disks = 0;
1701 mddev->new_level = mddev->level;
1702 mddev->new_layout = mddev->layout;
1703 mddev->new_chunk_sectors = mddev->chunk_sectors;
1706 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1707 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1709 if (le32_to_cpu(sb->feature_map) &
1710 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1711 if (le32_to_cpu(sb->feature_map) &
1712 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1714 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1715 (le32_to_cpu(sb->feature_map) &
1716 MD_FEATURE_MULTIPLE_PPLS))
1718 set_bit(MD_HAS_PPL, &mddev->flags);
1720 } else if (mddev->pers == NULL) {
1721 /* Insist of good event counter while assembling, except for
1722 * spares (which don't need an event count) */
1724 if (rdev->desc_nr >= 0 &&
1725 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1726 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1727 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1728 if (ev1 < mddev->events)
1730 } else if (mddev->bitmap) {
1731 /* If adding to array with a bitmap, then we can accept an
1732 * older device, but not too old.
1734 if (ev1 < mddev->bitmap->events_cleared)
1736 if (ev1 < mddev->events)
1737 set_bit(Bitmap_sync, &rdev->flags);
1739 if (ev1 < mddev->events)
1740 /* just a hot-add of a new device, leave raid_disk at -1 */
1743 if (mddev->level != LEVEL_MULTIPATH) {
1745 if (rdev->desc_nr < 0 ||
1746 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1747 role = MD_DISK_ROLE_SPARE;
1750 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1752 case MD_DISK_ROLE_SPARE: /* spare */
1754 case MD_DISK_ROLE_FAULTY: /* faulty */
1755 set_bit(Faulty, &rdev->flags);
1757 case MD_DISK_ROLE_JOURNAL: /* journal device */
1758 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1759 /* journal device without journal feature */
1760 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1763 set_bit(Journal, &rdev->flags);
1764 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1765 rdev->raid_disk = 0;
1768 rdev->saved_raid_disk = role;
1769 if ((le32_to_cpu(sb->feature_map) &
1770 MD_FEATURE_RECOVERY_OFFSET)) {
1771 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1772 if (!(le32_to_cpu(sb->feature_map) &
1773 MD_FEATURE_RECOVERY_BITMAP))
1774 rdev->saved_raid_disk = -1;
1776 set_bit(In_sync, &rdev->flags);
1777 rdev->raid_disk = role;
1780 if (sb->devflags & WriteMostly1)
1781 set_bit(WriteMostly, &rdev->flags);
1782 if (sb->devflags & FailFast1)
1783 set_bit(FailFast, &rdev->flags);
1784 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1785 set_bit(Replacement, &rdev->flags);
1786 } else /* MULTIPATH are always insync */
1787 set_bit(In_sync, &rdev->flags);
1792 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1794 struct mdp_superblock_1 *sb;
1795 struct md_rdev *rdev2;
1797 /* make rdev->sb match mddev and rdev data. */
1799 sb = page_address(rdev->sb_page);
1801 sb->feature_map = 0;
1803 sb->recovery_offset = cpu_to_le64(0);
1804 memset(sb->pad3, 0, sizeof(sb->pad3));
1806 sb->utime = cpu_to_le64((__u64)mddev->utime);
1807 sb->events = cpu_to_le64(mddev->events);
1809 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1810 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1811 sb->resync_offset = cpu_to_le64(MaxSector);
1813 sb->resync_offset = cpu_to_le64(0);
1815 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1817 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1818 sb->size = cpu_to_le64(mddev->dev_sectors);
1819 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1820 sb->level = cpu_to_le32(mddev->level);
1821 sb->layout = cpu_to_le32(mddev->layout);
1822 if (test_bit(FailFast, &rdev->flags))
1823 sb->devflags |= FailFast1;
1825 sb->devflags &= ~FailFast1;
1827 if (test_bit(WriteMostly, &rdev->flags))
1828 sb->devflags |= WriteMostly1;
1830 sb->devflags &= ~WriteMostly1;
1831 sb->data_offset = cpu_to_le64(rdev->data_offset);
1832 sb->data_size = cpu_to_le64(rdev->sectors);
1834 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1835 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1836 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1839 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1840 !test_bit(In_sync, &rdev->flags)) {
1842 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1843 sb->recovery_offset =
1844 cpu_to_le64(rdev->recovery_offset);
1845 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1847 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1849 /* Note: recovery_offset and journal_tail share space */
1850 if (test_bit(Journal, &rdev->flags))
1851 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1852 if (test_bit(Replacement, &rdev->flags))
1854 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1856 if (mddev->reshape_position != MaxSector) {
1857 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1858 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1859 sb->new_layout = cpu_to_le32(mddev->new_layout);
1860 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1861 sb->new_level = cpu_to_le32(mddev->new_level);
1862 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1863 if (mddev->delta_disks == 0 &&
1864 mddev->reshape_backwards)
1866 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1867 if (rdev->new_data_offset != rdev->data_offset) {
1869 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1870 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1871 - rdev->data_offset));
1875 if (mddev_is_clustered(mddev))
1876 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1878 if (rdev->badblocks.count == 0)
1879 /* Nothing to do for bad blocks*/ ;
1880 else if (sb->bblog_offset == 0)
1881 /* Cannot record bad blocks on this device */
1882 md_error(mddev, rdev);
1884 struct badblocks *bb = &rdev->badblocks;
1885 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1887 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1892 seq = read_seqbegin(&bb->lock);
1894 memset(bbp, 0xff, PAGE_SIZE);
1896 for (i = 0 ; i < bb->count ; i++) {
1897 u64 internal_bb = p[i];
1898 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1899 | BB_LEN(internal_bb));
1900 bbp[i] = cpu_to_le64(store_bb);
1903 if (read_seqretry(&bb->lock, seq))
1906 bb->sector = (rdev->sb_start +
1907 (int)le32_to_cpu(sb->bblog_offset));
1908 bb->size = le16_to_cpu(sb->bblog_size);
1913 rdev_for_each(rdev2, mddev)
1914 if (rdev2->desc_nr+1 > max_dev)
1915 max_dev = rdev2->desc_nr+1;
1917 if (max_dev > le32_to_cpu(sb->max_dev)) {
1919 sb->max_dev = cpu_to_le32(max_dev);
1920 rdev->sb_size = max_dev * 2 + 256;
1921 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1922 if (rdev->sb_size & bmask)
1923 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1925 max_dev = le32_to_cpu(sb->max_dev);
1927 for (i=0; i<max_dev;i++)
1928 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1930 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1931 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1933 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
1934 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
1936 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
1938 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
1939 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
1940 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
1943 rdev_for_each(rdev2, mddev) {
1945 if (test_bit(Faulty, &rdev2->flags))
1946 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1947 else if (test_bit(In_sync, &rdev2->flags))
1948 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1949 else if (test_bit(Journal, &rdev2->flags))
1950 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1951 else if (rdev2->raid_disk >= 0)
1952 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1954 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1957 sb->sb_csum = calc_sb_1_csum(sb);
1960 static unsigned long long
1961 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1963 struct mdp_superblock_1 *sb;
1964 sector_t max_sectors;
1965 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1966 return 0; /* component must fit device */
1967 if (rdev->data_offset != rdev->new_data_offset)
1968 return 0; /* too confusing */
1969 if (rdev->sb_start < rdev->data_offset) {
1970 /* minor versions 1 and 2; superblock before data */
1971 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1972 max_sectors -= rdev->data_offset;
1973 if (!num_sectors || num_sectors > max_sectors)
1974 num_sectors = max_sectors;
1975 } else if (rdev->mddev->bitmap_info.offset) {
1976 /* minor version 0 with bitmap we can't move */
1979 /* minor version 0; superblock after data */
1981 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1982 sb_start &= ~(sector_t)(4*2 - 1);
1983 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1984 if (!num_sectors || num_sectors > max_sectors)
1985 num_sectors = max_sectors;
1986 rdev->sb_start = sb_start;
1988 sb = page_address(rdev->sb_page);
1989 sb->data_size = cpu_to_le64(num_sectors);
1990 sb->super_offset = cpu_to_le64(rdev->sb_start);
1991 sb->sb_csum = calc_sb_1_csum(sb);
1993 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1995 } while (md_super_wait(rdev->mddev) < 0);
2001 super_1_allow_new_offset(struct md_rdev *rdev,
2002 unsigned long long new_offset)
2004 /* All necessary checks on new >= old have been done */
2005 struct bitmap *bitmap;
2006 if (new_offset >= rdev->data_offset)
2009 /* with 1.0 metadata, there is no metadata to tread on
2010 * so we can always move back */
2011 if (rdev->mddev->minor_version == 0)
2014 /* otherwise we must be sure not to step on
2015 * any metadata, so stay:
2016 * 36K beyond start of superblock
2017 * beyond end of badblocks
2018 * beyond write-intent bitmap
2020 if (rdev->sb_start + (32+4)*2 > new_offset)
2022 bitmap = rdev->mddev->bitmap;
2023 if (bitmap && !rdev->mddev->bitmap_info.file &&
2024 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2025 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2027 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2033 static struct super_type super_types[] = {
2036 .owner = THIS_MODULE,
2037 .load_super = super_90_load,
2038 .validate_super = super_90_validate,
2039 .sync_super = super_90_sync,
2040 .rdev_size_change = super_90_rdev_size_change,
2041 .allow_new_offset = super_90_allow_new_offset,
2045 .owner = THIS_MODULE,
2046 .load_super = super_1_load,
2047 .validate_super = super_1_validate,
2048 .sync_super = super_1_sync,
2049 .rdev_size_change = super_1_rdev_size_change,
2050 .allow_new_offset = super_1_allow_new_offset,
2054 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2056 if (mddev->sync_super) {
2057 mddev->sync_super(mddev, rdev);
2061 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2063 super_types[mddev->major_version].sync_super(mddev, rdev);
2066 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2068 struct md_rdev *rdev, *rdev2;
2071 rdev_for_each_rcu(rdev, mddev1) {
2072 if (test_bit(Faulty, &rdev->flags) ||
2073 test_bit(Journal, &rdev->flags) ||
2074 rdev->raid_disk == -1)
2076 rdev_for_each_rcu(rdev2, mddev2) {
2077 if (test_bit(Faulty, &rdev2->flags) ||
2078 test_bit(Journal, &rdev2->flags) ||
2079 rdev2->raid_disk == -1)
2081 if (rdev->bdev->bd_contains ==
2082 rdev2->bdev->bd_contains) {
2092 static LIST_HEAD(pending_raid_disks);
2095 * Try to register data integrity profile for an mddev
2097 * This is called when an array is started and after a disk has been kicked
2098 * from the array. It only succeeds if all working and active component devices
2099 * are integrity capable with matching profiles.
2101 int md_integrity_register(struct mddev *mddev)
2103 struct md_rdev *rdev, *reference = NULL;
2105 if (list_empty(&mddev->disks))
2106 return 0; /* nothing to do */
2107 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2108 return 0; /* shouldn't register, or already is */
2109 rdev_for_each(rdev, mddev) {
2110 /* skip spares and non-functional disks */
2111 if (test_bit(Faulty, &rdev->flags))
2113 if (rdev->raid_disk < 0)
2116 /* Use the first rdev as the reference */
2120 /* does this rdev's profile match the reference profile? */
2121 if (blk_integrity_compare(reference->bdev->bd_disk,
2122 rdev->bdev->bd_disk) < 0)
2125 if (!reference || !bdev_get_integrity(reference->bdev))
2128 * All component devices are integrity capable and have matching
2129 * profiles, register the common profile for the md device.
2131 blk_integrity_register(mddev->gendisk,
2132 bdev_get_integrity(reference->bdev));
2134 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2135 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2136 pr_err("md: failed to create integrity pool for %s\n",
2142 EXPORT_SYMBOL(md_integrity_register);
2145 * Attempt to add an rdev, but only if it is consistent with the current
2148 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2150 struct blk_integrity *bi_mddev;
2151 char name[BDEVNAME_SIZE];
2153 if (!mddev->gendisk)
2156 bi_mddev = blk_get_integrity(mddev->gendisk);
2158 if (!bi_mddev) /* nothing to do */
2161 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2162 pr_err("%s: incompatible integrity profile for %s\n",
2163 mdname(mddev), bdevname(rdev->bdev, name));
2169 EXPORT_SYMBOL(md_integrity_add_rdev);
2171 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2173 char b[BDEVNAME_SIZE];
2177 /* prevent duplicates */
2178 if (find_rdev(mddev, rdev->bdev->bd_dev))
2181 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2185 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2186 if (!test_bit(Journal, &rdev->flags) &&
2188 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2190 /* Cannot change size, so fail
2191 * If mddev->level <= 0, then we don't care
2192 * about aligning sizes (e.g. linear)
2194 if (mddev->level > 0)
2197 mddev->dev_sectors = rdev->sectors;
2200 /* Verify rdev->desc_nr is unique.
2201 * If it is -1, assign a free number, else
2202 * check number is not in use
2205 if (rdev->desc_nr < 0) {
2208 choice = mddev->raid_disks;
2209 while (md_find_rdev_nr_rcu(mddev, choice))
2211 rdev->desc_nr = choice;
2213 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2219 if (!test_bit(Journal, &rdev->flags) &&
2220 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2221 pr_warn("md: %s: array is limited to %d devices\n",
2222 mdname(mddev), mddev->max_disks);
2225 bdevname(rdev->bdev,b);
2226 strreplace(b, '/', '!');
2228 rdev->mddev = mddev;
2229 pr_debug("md: bind<%s>\n", b);
2231 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2234 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2235 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2236 /* failure here is OK */;
2237 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2239 list_add_rcu(&rdev->same_set, &mddev->disks);
2240 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2242 /* May as well allow recovery to be retried once */
2243 mddev->recovery_disabled++;
2248 pr_warn("md: failed to register dev-%s for %s\n",
2253 static void md_delayed_delete(struct work_struct *ws)
2255 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2256 kobject_del(&rdev->kobj);
2257 kobject_put(&rdev->kobj);
2260 static void unbind_rdev_from_array(struct md_rdev *rdev)
2262 char b[BDEVNAME_SIZE];
2264 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2265 list_del_rcu(&rdev->same_set);
2266 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2268 sysfs_remove_link(&rdev->kobj, "block");
2269 sysfs_put(rdev->sysfs_state);
2270 rdev->sysfs_state = NULL;
2271 rdev->badblocks.count = 0;
2272 /* We need to delay this, otherwise we can deadlock when
2273 * writing to 'remove' to "dev/state". We also need
2274 * to delay it due to rcu usage.
2277 INIT_WORK(&rdev->del_work, md_delayed_delete);
2278 kobject_get(&rdev->kobj);
2279 queue_work(md_misc_wq, &rdev->del_work);
2283 * prevent the device from being mounted, repartitioned or
2284 * otherwise reused by a RAID array (or any other kernel
2285 * subsystem), by bd_claiming the device.
2287 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2290 struct block_device *bdev;
2291 char b[BDEVNAME_SIZE];
2293 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2294 shared ? (struct md_rdev *)lock_rdev : rdev);
2296 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2297 return PTR_ERR(bdev);
2303 static void unlock_rdev(struct md_rdev *rdev)
2305 struct block_device *bdev = rdev->bdev;
2307 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2310 void md_autodetect_dev(dev_t dev);
2312 static void export_rdev(struct md_rdev *rdev)
2314 char b[BDEVNAME_SIZE];
2316 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2317 md_rdev_clear(rdev);
2319 if (test_bit(AutoDetected, &rdev->flags))
2320 md_autodetect_dev(rdev->bdev->bd_dev);
2323 kobject_put(&rdev->kobj);
2326 void md_kick_rdev_from_array(struct md_rdev *rdev)
2328 unbind_rdev_from_array(rdev);
2331 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2333 static void export_array(struct mddev *mddev)
2335 struct md_rdev *rdev;
2337 while (!list_empty(&mddev->disks)) {
2338 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2340 md_kick_rdev_from_array(rdev);
2342 mddev->raid_disks = 0;
2343 mddev->major_version = 0;
2346 static bool set_in_sync(struct mddev *mddev)
2348 lockdep_assert_held(&mddev->lock);
2349 if (!mddev->in_sync) {
2350 mddev->sync_checkers++;
2351 spin_unlock(&mddev->lock);
2352 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2353 spin_lock(&mddev->lock);
2354 if (!mddev->in_sync &&
2355 percpu_ref_is_zero(&mddev->writes_pending)) {
2358 * Ensure ->in_sync is visible before we clear
2362 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2363 sysfs_notify_dirent_safe(mddev->sysfs_state);
2365 if (--mddev->sync_checkers == 0)
2366 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2368 if (mddev->safemode == 1)
2369 mddev->safemode = 0;
2370 return mddev->in_sync;
2373 static void sync_sbs(struct mddev *mddev, int nospares)
2375 /* Update each superblock (in-memory image), but
2376 * if we are allowed to, skip spares which already
2377 * have the right event counter, or have one earlier
2378 * (which would mean they aren't being marked as dirty
2379 * with the rest of the array)
2381 struct md_rdev *rdev;
2382 rdev_for_each(rdev, mddev) {
2383 if (rdev->sb_events == mddev->events ||
2385 rdev->raid_disk < 0 &&
2386 rdev->sb_events+1 == mddev->events)) {
2387 /* Don't update this superblock */
2388 rdev->sb_loaded = 2;
2390 sync_super(mddev, rdev);
2391 rdev->sb_loaded = 1;
2396 static bool does_sb_need_changing(struct mddev *mddev)
2398 struct md_rdev *rdev;
2399 struct mdp_superblock_1 *sb;
2402 /* Find a good rdev */
2403 rdev_for_each(rdev, mddev)
2404 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2407 /* No good device found. */
2411 sb = page_address(rdev->sb_page);
2412 /* Check if a device has become faulty or a spare become active */
2413 rdev_for_each(rdev, mddev) {
2414 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2415 /* Device activated? */
2416 if (role == 0xffff && rdev->raid_disk >=0 &&
2417 !test_bit(Faulty, &rdev->flags))
2419 /* Device turned faulty? */
2420 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2424 /* Check if any mddev parameters have changed */
2425 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2426 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2427 (mddev->layout != le32_to_cpu(sb->layout)) ||
2428 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2429 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2435 void md_update_sb(struct mddev *mddev, int force_change)
2437 struct md_rdev *rdev;
2440 int any_badblocks_changed = 0;
2445 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2450 if (mddev_is_clustered(mddev)) {
2451 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2453 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2455 ret = md_cluster_ops->metadata_update_start(mddev);
2456 /* Has someone else has updated the sb */
2457 if (!does_sb_need_changing(mddev)) {
2459 md_cluster_ops->metadata_update_cancel(mddev);
2460 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2461 BIT(MD_SB_CHANGE_DEVS) |
2462 BIT(MD_SB_CHANGE_CLEAN));
2468 * First make sure individual recovery_offsets are correct
2469 * curr_resync_completed can only be used during recovery.
2470 * During reshape/resync it might use array-addresses rather
2471 * that device addresses.
2473 rdev_for_each(rdev, mddev) {
2474 if (rdev->raid_disk >= 0 &&
2475 mddev->delta_disks >= 0 &&
2476 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2477 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2478 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2479 !test_bit(Journal, &rdev->flags) &&
2480 !test_bit(In_sync, &rdev->flags) &&
2481 mddev->curr_resync_completed > rdev->recovery_offset)
2482 rdev->recovery_offset = mddev->curr_resync_completed;
2485 if (!mddev->persistent) {
2486 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2487 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2488 if (!mddev->external) {
2489 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2490 rdev_for_each(rdev, mddev) {
2491 if (rdev->badblocks.changed) {
2492 rdev->badblocks.changed = 0;
2493 ack_all_badblocks(&rdev->badblocks);
2494 md_error(mddev, rdev);
2496 clear_bit(Blocked, &rdev->flags);
2497 clear_bit(BlockedBadBlocks, &rdev->flags);
2498 wake_up(&rdev->blocked_wait);
2501 wake_up(&mddev->sb_wait);
2505 spin_lock(&mddev->lock);
2507 mddev->utime = ktime_get_real_seconds();
2509 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2511 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2512 /* just a clean<-> dirty transition, possibly leave spares alone,
2513 * though if events isn't the right even/odd, we will have to do
2519 if (mddev->degraded)
2520 /* If the array is degraded, then skipping spares is both
2521 * dangerous and fairly pointless.
2522 * Dangerous because a device that was removed from the array
2523 * might have a event_count that still looks up-to-date,
2524 * so it can be re-added without a resync.
2525 * Pointless because if there are any spares to skip,
2526 * then a recovery will happen and soon that array won't
2527 * be degraded any more and the spare can go back to sleep then.
2531 sync_req = mddev->in_sync;
2533 /* If this is just a dirty<->clean transition, and the array is clean
2534 * and 'events' is odd, we can roll back to the previous clean state */
2536 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2537 && mddev->can_decrease_events
2538 && mddev->events != 1) {
2540 mddev->can_decrease_events = 0;
2542 /* otherwise we have to go forward and ... */
2544 mddev->can_decrease_events = nospares;
2548 * This 64-bit counter should never wrap.
2549 * Either we are in around ~1 trillion A.C., assuming
2550 * 1 reboot per second, or we have a bug...
2552 WARN_ON(mddev->events == 0);
2554 rdev_for_each(rdev, mddev) {
2555 if (rdev->badblocks.changed)
2556 any_badblocks_changed++;
2557 if (test_bit(Faulty, &rdev->flags))
2558 set_bit(FaultRecorded, &rdev->flags);
2561 sync_sbs(mddev, nospares);
2562 spin_unlock(&mddev->lock);
2564 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2565 mdname(mddev), mddev->in_sync);
2568 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2570 md_bitmap_update_sb(mddev->bitmap);
2571 rdev_for_each(rdev, mddev) {
2572 char b[BDEVNAME_SIZE];
2574 if (rdev->sb_loaded != 1)
2575 continue; /* no noise on spare devices */
2577 if (!test_bit(Faulty, &rdev->flags)) {
2578 md_super_write(mddev,rdev,
2579 rdev->sb_start, rdev->sb_size,
2581 pr_debug("md: (write) %s's sb offset: %llu\n",
2582 bdevname(rdev->bdev, b),
2583 (unsigned long long)rdev->sb_start);
2584 rdev->sb_events = mddev->events;
2585 if (rdev->badblocks.size) {
2586 md_super_write(mddev, rdev,
2587 rdev->badblocks.sector,
2588 rdev->badblocks.size << 9,
2590 rdev->badblocks.size = 0;
2594 pr_debug("md: %s (skipping faulty)\n",
2595 bdevname(rdev->bdev, b));
2597 if (mddev->level == LEVEL_MULTIPATH)
2598 /* only need to write one superblock... */
2601 if (md_super_wait(mddev) < 0)
2603 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2605 if (mddev_is_clustered(mddev) && ret == 0)
2606 md_cluster_ops->metadata_update_finish(mddev);
2608 if (mddev->in_sync != sync_req ||
2609 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2610 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2611 /* have to write it out again */
2613 wake_up(&mddev->sb_wait);
2614 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2615 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2617 rdev_for_each(rdev, mddev) {
2618 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2619 clear_bit(Blocked, &rdev->flags);
2621 if (any_badblocks_changed)
2622 ack_all_badblocks(&rdev->badblocks);
2623 clear_bit(BlockedBadBlocks, &rdev->flags);
2624 wake_up(&rdev->blocked_wait);
2627 EXPORT_SYMBOL(md_update_sb);
2629 static int add_bound_rdev(struct md_rdev *rdev)
2631 struct mddev *mddev = rdev->mddev;
2633 bool add_journal = test_bit(Journal, &rdev->flags);
2635 if (!mddev->pers->hot_remove_disk || add_journal) {
2636 /* If there is hot_add_disk but no hot_remove_disk
2637 * then added disks for geometry changes,
2638 * and should be added immediately.
2640 super_types[mddev->major_version].
2641 validate_super(mddev, rdev);
2643 mddev_suspend(mddev);
2644 err = mddev->pers->hot_add_disk(mddev, rdev);
2646 mddev_resume(mddev);
2648 md_kick_rdev_from_array(rdev);
2652 sysfs_notify_dirent_safe(rdev->sysfs_state);
2654 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2655 if (mddev->degraded)
2656 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2657 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2658 md_new_event(mddev);
2659 md_wakeup_thread(mddev->thread);
2663 /* words written to sysfs files may, or may not, be \n terminated.
2664 * We want to accept with case. For this we use cmd_match.
2666 static int cmd_match(const char *cmd, const char *str)
2668 /* See if cmd, written into a sysfs file, matches
2669 * str. They must either be the same, or cmd can
2670 * have a trailing newline
2672 while (*cmd && *str && *cmd == *str) {
2683 struct rdev_sysfs_entry {
2684 struct attribute attr;
2685 ssize_t (*show)(struct md_rdev *, char *);
2686 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2690 state_show(struct md_rdev *rdev, char *page)
2694 unsigned long flags = READ_ONCE(rdev->flags);
2696 if (test_bit(Faulty, &flags) ||
2697 (!test_bit(ExternalBbl, &flags) &&
2698 rdev->badblocks.unacked_exist))
2699 len += sprintf(page+len, "faulty%s", sep);
2700 if (test_bit(In_sync, &flags))
2701 len += sprintf(page+len, "in_sync%s", sep);
2702 if (test_bit(Journal, &flags))
2703 len += sprintf(page+len, "journal%s", sep);
2704 if (test_bit(WriteMostly, &flags))
2705 len += sprintf(page+len, "write_mostly%s", sep);
2706 if (test_bit(Blocked, &flags) ||
2707 (rdev->badblocks.unacked_exist
2708 && !test_bit(Faulty, &flags)))
2709 len += sprintf(page+len, "blocked%s", sep);
2710 if (!test_bit(Faulty, &flags) &&
2711 !test_bit(Journal, &flags) &&
2712 !test_bit(In_sync, &flags))
2713 len += sprintf(page+len, "spare%s", sep);
2714 if (test_bit(WriteErrorSeen, &flags))
2715 len += sprintf(page+len, "write_error%s", sep);
2716 if (test_bit(WantReplacement, &flags))
2717 len += sprintf(page+len, "want_replacement%s", sep);
2718 if (test_bit(Replacement, &flags))
2719 len += sprintf(page+len, "replacement%s", sep);
2720 if (test_bit(ExternalBbl, &flags))
2721 len += sprintf(page+len, "external_bbl%s", sep);
2722 if (test_bit(FailFast, &flags))
2723 len += sprintf(page+len, "failfast%s", sep);
2728 return len+sprintf(page+len, "\n");
2732 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2735 * faulty - simulates an error
2736 * remove - disconnects the device
2737 * writemostly - sets write_mostly
2738 * -writemostly - clears write_mostly
2739 * blocked - sets the Blocked flags
2740 * -blocked - clears the Blocked and possibly simulates an error
2741 * insync - sets Insync providing device isn't active
2742 * -insync - clear Insync for a device with a slot assigned,
2743 * so that it gets rebuilt based on bitmap
2744 * write_error - sets WriteErrorSeen
2745 * -write_error - clears WriteErrorSeen
2746 * {,-}failfast - set/clear FailFast
2749 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2750 md_error(rdev->mddev, rdev);
2751 if (test_bit(Faulty, &rdev->flags))
2755 } else if (cmd_match(buf, "remove")) {
2756 if (rdev->mddev->pers) {
2757 clear_bit(Blocked, &rdev->flags);
2758 remove_and_add_spares(rdev->mddev, rdev);
2760 if (rdev->raid_disk >= 0)
2763 struct mddev *mddev = rdev->mddev;
2765 if (mddev_is_clustered(mddev))
2766 err = md_cluster_ops->remove_disk(mddev, rdev);
2769 md_kick_rdev_from_array(rdev);
2771 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2772 md_wakeup_thread(mddev->thread);
2774 md_new_event(mddev);
2777 } else if (cmd_match(buf, "writemostly")) {
2778 set_bit(WriteMostly, &rdev->flags);
2780 } else if (cmd_match(buf, "-writemostly")) {
2781 clear_bit(WriteMostly, &rdev->flags);
2783 } else if (cmd_match(buf, "blocked")) {
2784 set_bit(Blocked, &rdev->flags);
2786 } else if (cmd_match(buf, "-blocked")) {
2787 if (!test_bit(Faulty, &rdev->flags) &&
2788 !test_bit(ExternalBbl, &rdev->flags) &&
2789 rdev->badblocks.unacked_exist) {
2790 /* metadata handler doesn't understand badblocks,
2791 * so we need to fail the device
2793 md_error(rdev->mddev, rdev);
2795 clear_bit(Blocked, &rdev->flags);
2796 clear_bit(BlockedBadBlocks, &rdev->flags);
2797 wake_up(&rdev->blocked_wait);
2798 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2799 md_wakeup_thread(rdev->mddev->thread);
2802 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2803 set_bit(In_sync, &rdev->flags);
2805 } else if (cmd_match(buf, "failfast")) {
2806 set_bit(FailFast, &rdev->flags);
2808 } else if (cmd_match(buf, "-failfast")) {
2809 clear_bit(FailFast, &rdev->flags);
2811 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2812 !test_bit(Journal, &rdev->flags)) {
2813 if (rdev->mddev->pers == NULL) {
2814 clear_bit(In_sync, &rdev->flags);
2815 rdev->saved_raid_disk = rdev->raid_disk;
2816 rdev->raid_disk = -1;
2819 } else if (cmd_match(buf, "write_error")) {
2820 set_bit(WriteErrorSeen, &rdev->flags);
2822 } else if (cmd_match(buf, "-write_error")) {
2823 clear_bit(WriteErrorSeen, &rdev->flags);
2825 } else if (cmd_match(buf, "want_replacement")) {
2826 /* Any non-spare device that is not a replacement can
2827 * become want_replacement at any time, but we then need to
2828 * check if recovery is needed.
2830 if (rdev->raid_disk >= 0 &&
2831 !test_bit(Journal, &rdev->flags) &&
2832 !test_bit(Replacement, &rdev->flags))
2833 set_bit(WantReplacement, &rdev->flags);
2834 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2835 md_wakeup_thread(rdev->mddev->thread);
2837 } else if (cmd_match(buf, "-want_replacement")) {
2838 /* Clearing 'want_replacement' is always allowed.
2839 * Once replacements starts it is too late though.
2842 clear_bit(WantReplacement, &rdev->flags);
2843 } else if (cmd_match(buf, "replacement")) {
2844 /* Can only set a device as a replacement when array has not
2845 * yet been started. Once running, replacement is automatic
2846 * from spares, or by assigning 'slot'.
2848 if (rdev->mddev->pers)
2851 set_bit(Replacement, &rdev->flags);
2854 } else if (cmd_match(buf, "-replacement")) {
2855 /* Similarly, can only clear Replacement before start */
2856 if (rdev->mddev->pers)
2859 clear_bit(Replacement, &rdev->flags);
2862 } else if (cmd_match(buf, "re-add")) {
2863 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2864 rdev->saved_raid_disk >= 0) {
2865 /* clear_bit is performed _after_ all the devices
2866 * have their local Faulty bit cleared. If any writes
2867 * happen in the meantime in the local node, they
2868 * will land in the local bitmap, which will be synced
2869 * by this node eventually
2871 if (!mddev_is_clustered(rdev->mddev) ||
2872 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2873 clear_bit(Faulty, &rdev->flags);
2874 err = add_bound_rdev(rdev);
2878 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2879 set_bit(ExternalBbl, &rdev->flags);
2880 rdev->badblocks.shift = 0;
2882 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2883 clear_bit(ExternalBbl, &rdev->flags);
2887 sysfs_notify_dirent_safe(rdev->sysfs_state);
2888 return err ? err : len;
2890 static struct rdev_sysfs_entry rdev_state =
2891 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2894 errors_show(struct md_rdev *rdev, char *page)
2896 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2900 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2905 rv = kstrtouint(buf, 10, &n);
2908 atomic_set(&rdev->corrected_errors, n);
2911 static struct rdev_sysfs_entry rdev_errors =
2912 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2915 slot_show(struct md_rdev *rdev, char *page)
2917 if (test_bit(Journal, &rdev->flags))
2918 return sprintf(page, "journal\n");
2919 else if (rdev->raid_disk < 0)
2920 return sprintf(page, "none\n");
2922 return sprintf(page, "%d\n", rdev->raid_disk);
2926 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2931 if (test_bit(Journal, &rdev->flags))
2933 if (strncmp(buf, "none", 4)==0)
2936 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2940 if (rdev->mddev->pers && slot == -1) {
2941 /* Setting 'slot' on an active array requires also
2942 * updating the 'rd%d' link, and communicating
2943 * with the personality with ->hot_*_disk.
2944 * For now we only support removing
2945 * failed/spare devices. This normally happens automatically,
2946 * but not when the metadata is externally managed.
2948 if (rdev->raid_disk == -1)
2950 /* personality does all needed checks */
2951 if (rdev->mddev->pers->hot_remove_disk == NULL)
2953 clear_bit(Blocked, &rdev->flags);
2954 remove_and_add_spares(rdev->mddev, rdev);
2955 if (rdev->raid_disk >= 0)
2957 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2958 md_wakeup_thread(rdev->mddev->thread);
2959 } else if (rdev->mddev->pers) {
2960 /* Activating a spare .. or possibly reactivating
2961 * if we ever get bitmaps working here.
2965 if (rdev->raid_disk != -1)
2968 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2971 if (rdev->mddev->pers->hot_add_disk == NULL)
2974 if (slot >= rdev->mddev->raid_disks &&
2975 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2978 rdev->raid_disk = slot;
2979 if (test_bit(In_sync, &rdev->flags))
2980 rdev->saved_raid_disk = slot;
2982 rdev->saved_raid_disk = -1;
2983 clear_bit(In_sync, &rdev->flags);
2984 clear_bit(Bitmap_sync, &rdev->flags);
2985 err = rdev->mddev->pers->
2986 hot_add_disk(rdev->mddev, rdev);
2988 rdev->raid_disk = -1;
2991 sysfs_notify_dirent_safe(rdev->sysfs_state);
2992 if (sysfs_link_rdev(rdev->mddev, rdev))
2993 /* failure here is OK */;
2994 /* don't wakeup anyone, leave that to userspace. */
2996 if (slot >= rdev->mddev->raid_disks &&
2997 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2999 rdev->raid_disk = slot;
3000 /* assume it is working */
3001 clear_bit(Faulty, &rdev->flags);
3002 clear_bit(WriteMostly, &rdev->flags);
3003 set_bit(In_sync, &rdev->flags);
3004 sysfs_notify_dirent_safe(rdev->sysfs_state);
3009 static struct rdev_sysfs_entry rdev_slot =
3010 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3013 offset_show(struct md_rdev *rdev, char *page)
3015 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3019 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3021 unsigned long long offset;
3022 if (kstrtoull(buf, 10, &offset) < 0)
3024 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3026 if (rdev->sectors && rdev->mddev->external)
3027 /* Must set offset before size, so overlap checks
3030 rdev->data_offset = offset;
3031 rdev->new_data_offset = offset;
3035 static struct rdev_sysfs_entry rdev_offset =
3036 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3038 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3040 return sprintf(page, "%llu\n",
3041 (unsigned long long)rdev->new_data_offset);
3044 static ssize_t new_offset_store(struct md_rdev *rdev,
3045 const char *buf, size_t len)
3047 unsigned long long new_offset;
3048 struct mddev *mddev = rdev->mddev;
3050 if (kstrtoull(buf, 10, &new_offset) < 0)
3053 if (mddev->sync_thread ||
3054 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3056 if (new_offset == rdev->data_offset)
3057 /* reset is always permitted */
3059 else if (new_offset > rdev->data_offset) {
3060 /* must not push array size beyond rdev_sectors */
3061 if (new_offset - rdev->data_offset
3062 + mddev->dev_sectors > rdev->sectors)
3065 /* Metadata worries about other space details. */
3067 /* decreasing the offset is inconsistent with a backwards
3070 if (new_offset < rdev->data_offset &&
3071 mddev->reshape_backwards)
3073 /* Increasing offset is inconsistent with forwards
3074 * reshape. reshape_direction should be set to
3075 * 'backwards' first.
3077 if (new_offset > rdev->data_offset &&
3078 !mddev->reshape_backwards)
3081 if (mddev->pers && mddev->persistent &&
3082 !super_types[mddev->major_version]
3083 .allow_new_offset(rdev, new_offset))
3085 rdev->new_data_offset = new_offset;
3086 if (new_offset > rdev->data_offset)
3087 mddev->reshape_backwards = 1;
3088 else if (new_offset < rdev->data_offset)
3089 mddev->reshape_backwards = 0;
3093 static struct rdev_sysfs_entry rdev_new_offset =
3094 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3097 rdev_size_show(struct md_rdev *rdev, char *page)
3099 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3102 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3104 /* check if two start/length pairs overlap */
3112 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3114 unsigned long long blocks;
3117 if (kstrtoull(buf, 10, &blocks) < 0)
3120 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3121 return -EINVAL; /* sector conversion overflow */
3124 if (new != blocks * 2)
3125 return -EINVAL; /* unsigned long long to sector_t overflow */
3132 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3134 struct mddev *my_mddev = rdev->mddev;
3135 sector_t oldsectors = rdev->sectors;
3138 if (test_bit(Journal, &rdev->flags))
3140 if (strict_blocks_to_sectors(buf, §ors) < 0)
3142 if (rdev->data_offset != rdev->new_data_offset)
3143 return -EINVAL; /* too confusing */
3144 if (my_mddev->pers && rdev->raid_disk >= 0) {
3145 if (my_mddev->persistent) {
3146 sectors = super_types[my_mddev->major_version].
3147 rdev_size_change(rdev, sectors);
3150 } else if (!sectors)
3151 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3153 if (!my_mddev->pers->resize)
3154 /* Cannot change size for RAID0 or Linear etc */
3157 if (sectors < my_mddev->dev_sectors)
3158 return -EINVAL; /* component must fit device */
3160 rdev->sectors = sectors;
3161 if (sectors > oldsectors && my_mddev->external) {
3162 /* Need to check that all other rdevs with the same
3163 * ->bdev do not overlap. 'rcu' is sufficient to walk
3164 * the rdev lists safely.
3165 * This check does not provide a hard guarantee, it
3166 * just helps avoid dangerous mistakes.
3168 struct mddev *mddev;
3170 struct list_head *tmp;
3173 for_each_mddev(mddev, tmp) {
3174 struct md_rdev *rdev2;
3176 rdev_for_each(rdev2, mddev)
3177 if (rdev->bdev == rdev2->bdev &&
3179 overlaps(rdev->data_offset, rdev->sectors,
3192 /* Someone else could have slipped in a size
3193 * change here, but doing so is just silly.
3194 * We put oldsectors back because we *know* it is
3195 * safe, and trust userspace not to race with
3198 rdev->sectors = oldsectors;
3205 static struct rdev_sysfs_entry rdev_size =
3206 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3208 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3210 unsigned long long recovery_start = rdev->recovery_offset;
3212 if (test_bit(In_sync, &rdev->flags) ||
3213 recovery_start == MaxSector)
3214 return sprintf(page, "none\n");
3216 return sprintf(page, "%llu\n", recovery_start);
3219 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3221 unsigned long long recovery_start;
3223 if (cmd_match(buf, "none"))
3224 recovery_start = MaxSector;
3225 else if (kstrtoull(buf, 10, &recovery_start))
3228 if (rdev->mddev->pers &&
3229 rdev->raid_disk >= 0)
3232 rdev->recovery_offset = recovery_start;
3233 if (recovery_start == MaxSector)
3234 set_bit(In_sync, &rdev->flags);
3236 clear_bit(In_sync, &rdev->flags);
3240 static struct rdev_sysfs_entry rdev_recovery_start =
3241 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3243 /* sysfs access to bad-blocks list.
3244 * We present two files.
3245 * 'bad-blocks' lists sector numbers and lengths of ranges that
3246 * are recorded as bad. The list is truncated to fit within
3247 * the one-page limit of sysfs.
3248 * Writing "sector length" to this file adds an acknowledged
3250 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3251 * been acknowledged. Writing to this file adds bad blocks
3252 * without acknowledging them. This is largely for testing.
3254 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3256 return badblocks_show(&rdev->badblocks, page, 0);
3258 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3260 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3261 /* Maybe that ack was all we needed */
3262 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3263 wake_up(&rdev->blocked_wait);
3266 static struct rdev_sysfs_entry rdev_bad_blocks =
3267 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3269 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3271 return badblocks_show(&rdev->badblocks, page, 1);
3273 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3275 return badblocks_store(&rdev->badblocks, page, len, 1);
3277 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3278 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3281 ppl_sector_show(struct md_rdev *rdev, char *page)
3283 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3287 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3289 unsigned long long sector;
3291 if (kstrtoull(buf, 10, §or) < 0)
3293 if (sector != (sector_t)sector)
3296 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3297 rdev->raid_disk >= 0)
3300 if (rdev->mddev->persistent) {
3301 if (rdev->mddev->major_version == 0)
3303 if ((sector > rdev->sb_start &&
3304 sector - rdev->sb_start > S16_MAX) ||
3305 (sector < rdev->sb_start &&
3306 rdev->sb_start - sector > -S16_MIN))
3308 rdev->ppl.offset = sector - rdev->sb_start;
3309 } else if (!rdev->mddev->external) {
3312 rdev->ppl.sector = sector;
3316 static struct rdev_sysfs_entry rdev_ppl_sector =
3317 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3320 ppl_size_show(struct md_rdev *rdev, char *page)
3322 return sprintf(page, "%u\n", rdev->ppl.size);
3326 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3330 if (kstrtouint(buf, 10, &size) < 0)
3333 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3334 rdev->raid_disk >= 0)
3337 if (rdev->mddev->persistent) {
3338 if (rdev->mddev->major_version == 0)
3342 } else if (!rdev->mddev->external) {
3345 rdev->ppl.size = size;
3349 static struct rdev_sysfs_entry rdev_ppl_size =
3350 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3352 static struct attribute *rdev_default_attrs[] = {
3357 &rdev_new_offset.attr,
3359 &rdev_recovery_start.attr,
3360 &rdev_bad_blocks.attr,
3361 &rdev_unack_bad_blocks.attr,
3362 &rdev_ppl_sector.attr,
3363 &rdev_ppl_size.attr,
3367 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3369 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3370 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3376 return entry->show(rdev, page);
3380 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3381 const char *page, size_t length)
3383 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3384 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3386 struct mddev *mddev = rdev->mddev;
3390 if (!capable(CAP_SYS_ADMIN))
3392 rv = mddev ? mddev_lock(mddev): -EBUSY;
3394 if (rdev->mddev == NULL)
3397 rv = entry->store(rdev, page, length);
3398 mddev_unlock(mddev);
3403 static void rdev_free(struct kobject *ko)
3405 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3408 static const struct sysfs_ops rdev_sysfs_ops = {
3409 .show = rdev_attr_show,
3410 .store = rdev_attr_store,
3412 static struct kobj_type rdev_ktype = {
3413 .release = rdev_free,
3414 .sysfs_ops = &rdev_sysfs_ops,
3415 .default_attrs = rdev_default_attrs,
3418 int md_rdev_init(struct md_rdev *rdev)
3421 rdev->saved_raid_disk = -1;
3422 rdev->raid_disk = -1;
3424 rdev->data_offset = 0;
3425 rdev->new_data_offset = 0;
3426 rdev->sb_events = 0;
3427 rdev->last_read_error = 0;
3428 rdev->sb_loaded = 0;
3429 rdev->bb_page = NULL;
3430 atomic_set(&rdev->nr_pending, 0);
3431 atomic_set(&rdev->read_errors, 0);
3432 atomic_set(&rdev->corrected_errors, 0);
3434 INIT_LIST_HEAD(&rdev->same_set);
3435 init_waitqueue_head(&rdev->blocked_wait);
3437 /* Add space to store bad block list.
3438 * This reserves the space even on arrays where it cannot
3439 * be used - I wonder if that matters
3441 return badblocks_init(&rdev->badblocks, 0);
3443 EXPORT_SYMBOL_GPL(md_rdev_init);
3445 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3447 * mark the device faulty if:
3449 * - the device is nonexistent (zero size)
3450 * - the device has no valid superblock
3452 * a faulty rdev _never_ has rdev->sb set.
3454 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3456 char b[BDEVNAME_SIZE];
3458 struct md_rdev *rdev;
3461 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3463 return ERR_PTR(-ENOMEM);
3465 err = md_rdev_init(rdev);
3468 err = alloc_disk_sb(rdev);
3472 err = lock_rdev(rdev, newdev, super_format == -2);
3476 kobject_init(&rdev->kobj, &rdev_ktype);
3478 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3480 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3481 bdevname(rdev->bdev,b));
3486 if (super_format >= 0) {
3487 err = super_types[super_format].
3488 load_super(rdev, NULL, super_minor);
3489 if (err == -EINVAL) {
3490 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3491 bdevname(rdev->bdev,b),
3492 super_format, super_minor);
3496 pr_warn("md: could not read %s's sb, not importing!\n",
3497 bdevname(rdev->bdev,b));
3507 md_rdev_clear(rdev);
3509 return ERR_PTR(err);
3513 * Check a full RAID array for plausibility
3516 static void analyze_sbs(struct mddev *mddev)
3519 struct md_rdev *rdev, *freshest, *tmp;
3520 char b[BDEVNAME_SIZE];
3523 rdev_for_each_safe(rdev, tmp, mddev)
3524 switch (super_types[mddev->major_version].
3525 load_super(rdev, freshest, mddev->minor_version)) {
3532 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3533 bdevname(rdev->bdev,b));
3534 md_kick_rdev_from_array(rdev);
3537 super_types[mddev->major_version].
3538 validate_super(mddev, freshest);
3541 rdev_for_each_safe(rdev, tmp, mddev) {
3542 if (mddev->max_disks &&
3543 (rdev->desc_nr >= mddev->max_disks ||
3544 i > mddev->max_disks)) {
3545 pr_warn("md: %s: %s: only %d devices permitted\n",
3546 mdname(mddev), bdevname(rdev->bdev, b),
3548 md_kick_rdev_from_array(rdev);
3551 if (rdev != freshest) {
3552 if (super_types[mddev->major_version].
3553 validate_super(mddev, rdev)) {
3554 pr_warn("md: kicking non-fresh %s from array!\n",
3555 bdevname(rdev->bdev,b));
3556 md_kick_rdev_from_array(rdev);
3560 if (mddev->level == LEVEL_MULTIPATH) {
3561 rdev->desc_nr = i++;
3562 rdev->raid_disk = rdev->desc_nr;
3563 set_bit(In_sync, &rdev->flags);
3564 } else if (rdev->raid_disk >=
3565 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3566 !test_bit(Journal, &rdev->flags)) {
3567 rdev->raid_disk = -1;
3568 clear_bit(In_sync, &rdev->flags);
3573 /* Read a fixed-point number.
3574 * Numbers in sysfs attributes should be in "standard" units where
3575 * possible, so time should be in seconds.
3576 * However we internally use a a much smaller unit such as
3577 * milliseconds or jiffies.
3578 * This function takes a decimal number with a possible fractional
3579 * component, and produces an integer which is the result of
3580 * multiplying that number by 10^'scale'.
3581 * all without any floating-point arithmetic.
3583 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3585 unsigned long result = 0;
3587 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3590 else if (decimals < scale) {
3593 result = result * 10 + value;
3605 while (decimals < scale) {
3614 safe_delay_show(struct mddev *mddev, char *page)
3616 int msec = (mddev->safemode_delay*1000)/HZ;
3617 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3620 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3624 if (mddev_is_clustered(mddev)) {
3625 pr_warn("md: Safemode is disabled for clustered mode\n");
3629 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3632 mddev->safemode_delay = 0;
3634 unsigned long old_delay = mddev->safemode_delay;
3635 unsigned long new_delay = (msec*HZ)/1000;
3639 mddev->safemode_delay = new_delay;
3640 if (new_delay < old_delay || old_delay == 0)
3641 mod_timer(&mddev->safemode_timer, jiffies+1);
3645 static struct md_sysfs_entry md_safe_delay =
3646 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3649 level_show(struct mddev *mddev, char *page)
3651 struct md_personality *p;
3653 spin_lock(&mddev->lock);
3656 ret = sprintf(page, "%s\n", p->name);
3657 else if (mddev->clevel[0])
3658 ret = sprintf(page, "%s\n", mddev->clevel);
3659 else if (mddev->level != LEVEL_NONE)
3660 ret = sprintf(page, "%d\n", mddev->level);
3663 spin_unlock(&mddev->lock);
3668 level_store(struct mddev *mddev, const char *buf, size_t len)
3673 struct md_personality *pers, *oldpers;
3675 void *priv, *oldpriv;
3676 struct md_rdev *rdev;
3678 if (slen == 0 || slen >= sizeof(clevel))
3681 rv = mddev_lock(mddev);
3685 if (mddev->pers == NULL) {
3686 strncpy(mddev->clevel, buf, slen);
3687 if (mddev->clevel[slen-1] == '\n')
3689 mddev->clevel[slen] = 0;
3690 mddev->level = LEVEL_NONE;
3698 /* request to change the personality. Need to ensure:
3699 * - array is not engaged in resync/recovery/reshape
3700 * - old personality can be suspended
3701 * - new personality will access other array.
3705 if (mddev->sync_thread ||
3706 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3707 mddev->reshape_position != MaxSector ||
3708 mddev->sysfs_active)
3712 if (!mddev->pers->quiesce) {
3713 pr_warn("md: %s: %s does not support online personality change\n",
3714 mdname(mddev), mddev->pers->name);
3718 /* Now find the new personality */
3719 strncpy(clevel, buf, slen);
3720 if (clevel[slen-1] == '\n')
3723 if (kstrtol(clevel, 10, &level))
3726 if (request_module("md-%s", clevel) != 0)
3727 request_module("md-level-%s", clevel);
3728 spin_lock(&pers_lock);
3729 pers = find_pers(level, clevel);
3730 if (!pers || !try_module_get(pers->owner)) {
3731 spin_unlock(&pers_lock);
3732 pr_warn("md: personality %s not loaded\n", clevel);
3736 spin_unlock(&pers_lock);
3738 if (pers == mddev->pers) {
3739 /* Nothing to do! */
3740 module_put(pers->owner);
3744 if (!pers->takeover) {
3745 module_put(pers->owner);
3746 pr_warn("md: %s: %s does not support personality takeover\n",
3747 mdname(mddev), clevel);
3752 rdev_for_each(rdev, mddev)
3753 rdev->new_raid_disk = rdev->raid_disk;
3755 /* ->takeover must set new_* and/or delta_disks
3756 * if it succeeds, and may set them when it fails.
3758 priv = pers->takeover(mddev);
3760 mddev->new_level = mddev->level;
3761 mddev->new_layout = mddev->layout;
3762 mddev->new_chunk_sectors = mddev->chunk_sectors;
3763 mddev->raid_disks -= mddev->delta_disks;
3764 mddev->delta_disks = 0;
3765 mddev->reshape_backwards = 0;
3766 module_put(pers->owner);
3767 pr_warn("md: %s: %s would not accept array\n",
3768 mdname(mddev), clevel);
3773 /* Looks like we have a winner */
3774 mddev_suspend(mddev);
3775 mddev_detach(mddev);
3777 spin_lock(&mddev->lock);
3778 oldpers = mddev->pers;
3779 oldpriv = mddev->private;
3781 mddev->private = priv;
3782 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3783 mddev->level = mddev->new_level;
3784 mddev->layout = mddev->new_layout;
3785 mddev->chunk_sectors = mddev->new_chunk_sectors;
3786 mddev->delta_disks = 0;
3787 mddev->reshape_backwards = 0;
3788 mddev->degraded = 0;
3789 spin_unlock(&mddev->lock);
3791 if (oldpers->sync_request == NULL &&
3793 /* We are converting from a no-redundancy array
3794 * to a redundancy array and metadata is managed
3795 * externally so we need to be sure that writes
3796 * won't block due to a need to transition
3798 * until external management is started.
3801 mddev->safemode_delay = 0;
3802 mddev->safemode = 0;
3805 oldpers->free(mddev, oldpriv);
3807 if (oldpers->sync_request == NULL &&
3808 pers->sync_request != NULL) {
3809 /* need to add the md_redundancy_group */
3810 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3811 pr_warn("md: cannot register extra attributes for %s\n",
3813 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3815 if (oldpers->sync_request != NULL &&
3816 pers->sync_request == NULL) {
3817 /* need to remove the md_redundancy_group */
3818 if (mddev->to_remove == NULL)
3819 mddev->to_remove = &md_redundancy_group;
3822 module_put(oldpers->owner);
3824 rdev_for_each(rdev, mddev) {
3825 if (rdev->raid_disk < 0)
3827 if (rdev->new_raid_disk >= mddev->raid_disks)
3828 rdev->new_raid_disk = -1;
3829 if (rdev->new_raid_disk == rdev->raid_disk)
3831 sysfs_unlink_rdev(mddev, rdev);
3833 rdev_for_each(rdev, mddev) {
3834 if (rdev->raid_disk < 0)
3836 if (rdev->new_raid_disk == rdev->raid_disk)
3838 rdev->raid_disk = rdev->new_raid_disk;
3839 if (rdev->raid_disk < 0)
3840 clear_bit(In_sync, &rdev->flags);
3842 if (sysfs_link_rdev(mddev, rdev))
3843 pr_warn("md: cannot register rd%d for %s after level change\n",
3844 rdev->raid_disk, mdname(mddev));
3848 if (pers->sync_request == NULL) {
3849 /* this is now an array without redundancy, so
3850 * it must always be in_sync
3853 del_timer_sync(&mddev->safemode_timer);
3855 blk_set_stacking_limits(&mddev->queue->limits);
3857 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3858 mddev_resume(mddev);
3860 md_update_sb(mddev, 1);
3861 sysfs_notify(&mddev->kobj, NULL, "level");
3862 md_new_event(mddev);
3865 mddev_unlock(mddev);
3869 static struct md_sysfs_entry md_level =
3870 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3873 layout_show(struct mddev *mddev, char *page)
3875 /* just a number, not meaningful for all levels */
3876 if (mddev->reshape_position != MaxSector &&
3877 mddev->layout != mddev->new_layout)
3878 return sprintf(page, "%d (%d)\n",
3879 mddev->new_layout, mddev->layout);
3880 return sprintf(page, "%d\n", mddev->layout);
3884 layout_store(struct mddev *mddev, const char *buf, size_t len)
3889 err = kstrtouint(buf, 10, &n);
3892 err = mddev_lock(mddev);
3897 if (mddev->pers->check_reshape == NULL)
3902 mddev->new_layout = n;
3903 err = mddev->pers->check_reshape(mddev);
3905 mddev->new_layout = mddev->layout;
3908 mddev->new_layout = n;
3909 if (mddev->reshape_position == MaxSector)
3912 mddev_unlock(mddev);
3915 static struct md_sysfs_entry md_layout =
3916 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3919 raid_disks_show(struct mddev *mddev, char *page)
3921 if (mddev->raid_disks == 0)
3923 if (mddev->reshape_position != MaxSector &&
3924 mddev->delta_disks != 0)
3925 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3926 mddev->raid_disks - mddev->delta_disks);
3927 return sprintf(page, "%d\n", mddev->raid_disks);
3930 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3933 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3938 err = kstrtouint(buf, 10, &n);
3942 err = mddev_lock(mddev);
3946 err = update_raid_disks(mddev, n);
3947 else if (mddev->reshape_position != MaxSector) {
3948 struct md_rdev *rdev;
3949 int olddisks = mddev->raid_disks - mddev->delta_disks;
3952 rdev_for_each(rdev, mddev) {
3954 rdev->data_offset < rdev->new_data_offset)
3957 rdev->data_offset > rdev->new_data_offset)
3961 mddev->delta_disks = n - olddisks;
3962 mddev->raid_disks = n;
3963 mddev->reshape_backwards = (mddev->delta_disks < 0);
3965 mddev->raid_disks = n;
3967 mddev_unlock(mddev);
3968 return err ? err : len;
3970 static struct md_sysfs_entry md_raid_disks =
3971 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3974 chunk_size_show(struct mddev *mddev, char *page)
3976 if (mddev->reshape_position != MaxSector &&
3977 mddev->chunk_sectors != mddev->new_chunk_sectors)
3978 return sprintf(page, "%d (%d)\n",
3979 mddev->new_chunk_sectors << 9,
3980 mddev->chunk_sectors << 9);
3981 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3985 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3990 err = kstrtoul(buf, 10, &n);
3994 err = mddev_lock(mddev);
3998 if (mddev->pers->check_reshape == NULL)
4003 mddev->new_chunk_sectors = n >> 9;
4004 err = mddev->pers->check_reshape(mddev);
4006 mddev->new_chunk_sectors = mddev->chunk_sectors;
4009 mddev->new_chunk_sectors = n >> 9;
4010 if (mddev->reshape_position == MaxSector)
4011 mddev->chunk_sectors = n >> 9;
4013 mddev_unlock(mddev);
4016 static struct md_sysfs_entry md_chunk_size =
4017 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4020 resync_start_show(struct mddev *mddev, char *page)
4022 if (mddev->recovery_cp == MaxSector)
4023 return sprintf(page, "none\n");
4024 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4028 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4030 unsigned long long n;
4033 if (cmd_match(buf, "none"))
4036 err = kstrtoull(buf, 10, &n);
4039 if (n != (sector_t)n)
4043 err = mddev_lock(mddev);
4046 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4050 mddev->recovery_cp = n;
4052 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4054 mddev_unlock(mddev);
4057 static struct md_sysfs_entry md_resync_start =
4058 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4059 resync_start_show, resync_start_store);
4062 * The array state can be:
4065 * No devices, no size, no level
4066 * Equivalent to STOP_ARRAY ioctl
4068 * May have some settings, but array is not active
4069 * all IO results in error
4070 * When written, doesn't tear down array, but just stops it
4071 * suspended (not supported yet)
4072 * All IO requests will block. The array can be reconfigured.
4073 * Writing this, if accepted, will block until array is quiescent
4075 * no resync can happen. no superblocks get written.
4076 * write requests fail
4078 * like readonly, but behaves like 'clean' on a write request.
4080 * clean - no pending writes, but otherwise active.
4081 * When written to inactive array, starts without resync
4082 * If a write request arrives then
4083 * if metadata is known, mark 'dirty' and switch to 'active'.
4084 * if not known, block and switch to write-pending
4085 * If written to an active array that has pending writes, then fails.
4087 * fully active: IO and resync can be happening.
4088 * When written to inactive array, starts with resync
4091 * clean, but writes are blocked waiting for 'active' to be written.
4094 * like active, but no writes have been seen for a while (100msec).
4097 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4098 write_pending, active_idle, bad_word};
4099 static char *array_states[] = {
4100 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4101 "write-pending", "active-idle", NULL };
4103 static int match_word(const char *word, char **list)
4106 for (n=0; list[n]; n++)
4107 if (cmd_match(word, list[n]))
4113 array_state_show(struct mddev *mddev, char *page)
4115 enum array_state st = inactive;
4126 spin_lock(&mddev->lock);
4127 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4129 else if (mddev->in_sync)
4131 else if (mddev->safemode)
4135 spin_unlock(&mddev->lock);
4138 if (list_empty(&mddev->disks) &&
4139 mddev->raid_disks == 0 &&
4140 mddev->dev_sectors == 0)
4145 return sprintf(page, "%s\n", array_states[st]);
4148 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4149 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4150 static int do_md_run(struct mddev *mddev);
4151 static int restart_array(struct mddev *mddev);
4154 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4157 enum array_state st = match_word(buf, array_states);
4159 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4160 /* don't take reconfig_mutex when toggling between
4163 spin_lock(&mddev->lock);
4165 restart_array(mddev);
4166 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4167 md_wakeup_thread(mddev->thread);
4168 wake_up(&mddev->sb_wait);
4169 } else /* st == clean */ {
4170 restart_array(mddev);
4171 if (!set_in_sync(mddev))
4175 sysfs_notify_dirent_safe(mddev->sysfs_state);
4176 spin_unlock(&mddev->lock);
4179 err = mddev_lock(mddev);
4187 /* stopping an active array */
4188 err = do_md_stop(mddev, 0, NULL);
4191 /* stopping an active array */
4193 err = do_md_stop(mddev, 2, NULL);
4195 err = 0; /* already inactive */
4198 break; /* not supported yet */
4201 err = md_set_readonly(mddev, NULL);
4204 set_disk_ro(mddev->gendisk, 1);
4205 err = do_md_run(mddev);
4211 err = md_set_readonly(mddev, NULL);
4212 else if (mddev->ro == 1)
4213 err = restart_array(mddev);
4216 set_disk_ro(mddev->gendisk, 0);
4220 err = do_md_run(mddev);
4225 err = restart_array(mddev);
4228 spin_lock(&mddev->lock);
4229 if (!set_in_sync(mddev))
4231 spin_unlock(&mddev->lock);
4237 err = restart_array(mddev);
4240 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4241 wake_up(&mddev->sb_wait);
4245 set_disk_ro(mddev->gendisk, 0);
4246 err = do_md_run(mddev);
4251 /* these cannot be set */
4256 if (mddev->hold_active == UNTIL_IOCTL)
4257 mddev->hold_active = 0;
4258 sysfs_notify_dirent_safe(mddev->sysfs_state);
4260 mddev_unlock(mddev);
4263 static struct md_sysfs_entry md_array_state =
4264 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4267 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4268 return sprintf(page, "%d\n",
4269 atomic_read(&mddev->max_corr_read_errors));
4273 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4278 rv = kstrtouint(buf, 10, &n);
4281 atomic_set(&mddev->max_corr_read_errors, n);
4285 static struct md_sysfs_entry max_corr_read_errors =
4286 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4287 max_corrected_read_errors_store);
4290 null_show(struct mddev *mddev, char *page)
4296 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4298 /* buf must be %d:%d\n? giving major and minor numbers */
4299 /* The new device is added to the array.
4300 * If the array has a persistent superblock, we read the
4301 * superblock to initialise info and check validity.
4302 * Otherwise, only checking done is that in bind_rdev_to_array,
4303 * which mainly checks size.
4306 int major = simple_strtoul(buf, &e, 10);
4309 struct md_rdev *rdev;
4312 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4314 minor = simple_strtoul(e+1, &e, 10);
4315 if (*e && *e != '\n')
4317 dev = MKDEV(major, minor);
4318 if (major != MAJOR(dev) ||
4319 minor != MINOR(dev))
4322 flush_workqueue(md_misc_wq);
4324 err = mddev_lock(mddev);
4327 if (mddev->persistent) {
4328 rdev = md_import_device(dev, mddev->major_version,
4329 mddev->minor_version);
4330 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4331 struct md_rdev *rdev0
4332 = list_entry(mddev->disks.next,
4333 struct md_rdev, same_set);
4334 err = super_types[mddev->major_version]
4335 .load_super(rdev, rdev0, mddev->minor_version);
4339 } else if (mddev->external)
4340 rdev = md_import_device(dev, -2, -1);
4342 rdev = md_import_device(dev, -1, -1);
4345 mddev_unlock(mddev);
4346 return PTR_ERR(rdev);
4348 err = bind_rdev_to_array(rdev, mddev);
4352 mddev_unlock(mddev);
4354 md_new_event(mddev);
4355 return err ? err : len;
4358 static struct md_sysfs_entry md_new_device =
4359 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4362 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4365 unsigned long chunk, end_chunk;
4368 err = mddev_lock(mddev);
4373 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4375 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4376 if (buf == end) break;
4377 if (*end == '-') { /* range */
4379 end_chunk = simple_strtoul(buf, &end, 0);
4380 if (buf == end) break;
4382 if (*end && !isspace(*end)) break;
4383 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4384 buf = skip_spaces(end);
4386 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4388 mddev_unlock(mddev);
4392 static struct md_sysfs_entry md_bitmap =
4393 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4396 size_show(struct mddev *mddev, char *page)
4398 return sprintf(page, "%llu\n",
4399 (unsigned long long)mddev->dev_sectors / 2);
4402 static int update_size(struct mddev *mddev, sector_t num_sectors);
4405 size_store(struct mddev *mddev, const char *buf, size_t len)
4407 /* If array is inactive, we can reduce the component size, but
4408 * not increase it (except from 0).
4409 * If array is active, we can try an on-line resize
4412 int err = strict_blocks_to_sectors(buf, §ors);
4416 err = mddev_lock(mddev);
4420 err = update_size(mddev, sectors);
4422 md_update_sb(mddev, 1);
4424 if (mddev->dev_sectors == 0 ||
4425 mddev->dev_sectors > sectors)
4426 mddev->dev_sectors = sectors;
4430 mddev_unlock(mddev);
4431 return err ? err : len;
4434 static struct md_sysfs_entry md_size =
4435 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4437 /* Metadata version.
4439 * 'none' for arrays with no metadata (good luck...)
4440 * 'external' for arrays with externally managed metadata,
4441 * or N.M for internally known formats
4444 metadata_show(struct mddev *mddev, char *page)
4446 if (mddev->persistent)
4447 return sprintf(page, "%d.%d\n",
4448 mddev->major_version, mddev->minor_version);
4449 else if (mddev->external)
4450 return sprintf(page, "external:%s\n", mddev->metadata_type);
4452 return sprintf(page, "none\n");
4456 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4461 /* Changing the details of 'external' metadata is
4462 * always permitted. Otherwise there must be
4463 * no devices attached to the array.
4466 err = mddev_lock(mddev);
4470 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4472 else if (!list_empty(&mddev->disks))
4476 if (cmd_match(buf, "none")) {
4477 mddev->persistent = 0;
4478 mddev->external = 0;
4479 mddev->major_version = 0;
4480 mddev->minor_version = 90;
4483 if (strncmp(buf, "external:", 9) == 0) {
4484 size_t namelen = len-9;
4485 if (namelen >= sizeof(mddev->metadata_type))
4486 namelen = sizeof(mddev->metadata_type)-1;
4487 strncpy(mddev->metadata_type, buf+9, namelen);
4488 mddev->metadata_type[namelen] = 0;
4489 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4490 mddev->metadata_type[--namelen] = 0;
4491 mddev->persistent = 0;
4492 mddev->external = 1;
4493 mddev->major_version = 0;
4494 mddev->minor_version = 90;
4497 major = simple_strtoul(buf, &e, 10);
4499 if (e==buf || *e != '.')
4502 minor = simple_strtoul(buf, &e, 10);
4503 if (e==buf || (*e && *e != '\n') )
4506 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4508 mddev->major_version = major;
4509 mddev->minor_version = minor;
4510 mddev->persistent = 1;
4511 mddev->external = 0;
4514 mddev_unlock(mddev);
4518 static struct md_sysfs_entry md_metadata =
4519 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4522 action_show(struct mddev *mddev, char *page)
4524 char *type = "idle";
4525 unsigned long recovery = mddev->recovery;
4526 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4528 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4529 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4530 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4532 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4533 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4535 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4539 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4541 else if (mddev->reshape_position != MaxSector)
4544 return sprintf(page, "%s\n", type);
4548 action_store(struct mddev *mddev, const char *page, size_t len)
4550 if (!mddev->pers || !mddev->pers->sync_request)
4554 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4555 if (cmd_match(page, "frozen"))
4556 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4558 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4559 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4560 mddev_lock(mddev) == 0) {
4561 flush_workqueue(md_misc_wq);
4562 if (mddev->sync_thread) {
4563 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4564 md_reap_sync_thread(mddev);
4566 mddev_unlock(mddev);
4568 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4570 else if (cmd_match(page, "resync"))
4571 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4572 else if (cmd_match(page, "recover")) {
4573 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4574 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4575 } else if (cmd_match(page, "reshape")) {
4577 if (mddev->pers->start_reshape == NULL)
4579 err = mddev_lock(mddev);
4581 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4584 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4585 err = mddev->pers->start_reshape(mddev);
4587 mddev_unlock(mddev);
4591 sysfs_notify(&mddev->kobj, NULL, "degraded");
4593 if (cmd_match(page, "check"))
4594 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4595 else if (!cmd_match(page, "repair"))
4597 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4598 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4599 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4601 if (mddev->ro == 2) {
4602 /* A write to sync_action is enough to justify
4603 * canceling read-auto mode
4606 md_wakeup_thread(mddev->sync_thread);
4608 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4609 md_wakeup_thread(mddev->thread);
4610 sysfs_notify_dirent_safe(mddev->sysfs_action);
4614 static struct md_sysfs_entry md_scan_mode =
4615 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4618 last_sync_action_show(struct mddev *mddev, char *page)
4620 return sprintf(page, "%s\n", mddev->last_sync_action);
4623 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4626 mismatch_cnt_show(struct mddev *mddev, char *page)
4628 return sprintf(page, "%llu\n",
4629 (unsigned long long)
4630 atomic64_read(&mddev->resync_mismatches));
4633 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4636 sync_min_show(struct mddev *mddev, char *page)
4638 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4639 mddev->sync_speed_min ? "local": "system");
4643 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4648 if (strncmp(buf, "system", 6)==0) {
4651 rv = kstrtouint(buf, 10, &min);
4657 mddev->sync_speed_min = min;
4661 static struct md_sysfs_entry md_sync_min =
4662 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4665 sync_max_show(struct mddev *mddev, char *page)
4667 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4668 mddev->sync_speed_max ? "local": "system");
4672 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4677 if (strncmp(buf, "system", 6)==0) {
4680 rv = kstrtouint(buf, 10, &max);
4686 mddev->sync_speed_max = max;
4690 static struct md_sysfs_entry md_sync_max =
4691 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4694 degraded_show(struct mddev *mddev, char *page)
4696 return sprintf(page, "%d\n", mddev->degraded);
4698 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4701 sync_force_parallel_show(struct mddev *mddev, char *page)
4703 return sprintf(page, "%d\n", mddev->parallel_resync);
4707 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4711 if (kstrtol(buf, 10, &n))
4714 if (n != 0 && n != 1)
4717 mddev->parallel_resync = n;
4719 if (mddev->sync_thread)
4720 wake_up(&resync_wait);
4725 /* force parallel resync, even with shared block devices */
4726 static struct md_sysfs_entry md_sync_force_parallel =
4727 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4728 sync_force_parallel_show, sync_force_parallel_store);
4731 sync_speed_show(struct mddev *mddev, char *page)
4733 unsigned long resync, dt, db;
4734 if (mddev->curr_resync == 0)
4735 return sprintf(page, "none\n");
4736 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4737 dt = (jiffies - mddev->resync_mark) / HZ;
4739 db = resync - mddev->resync_mark_cnt;
4740 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4743 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4746 sync_completed_show(struct mddev *mddev, char *page)
4748 unsigned long long max_sectors, resync;
4750 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4751 return sprintf(page, "none\n");
4753 if (mddev->curr_resync == 1 ||
4754 mddev->curr_resync == 2)
4755 return sprintf(page, "delayed\n");
4757 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4758 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4759 max_sectors = mddev->resync_max_sectors;
4761 max_sectors = mddev->dev_sectors;
4763 resync = mddev->curr_resync_completed;
4764 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4767 static struct md_sysfs_entry md_sync_completed =
4768 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4771 min_sync_show(struct mddev *mddev, char *page)
4773 return sprintf(page, "%llu\n",
4774 (unsigned long long)mddev->resync_min);
4777 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4779 unsigned long long min;
4782 if (kstrtoull(buf, 10, &min))
4785 spin_lock(&mddev->lock);
4787 if (min > mddev->resync_max)
4791 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4794 /* Round down to multiple of 4K for safety */
4795 mddev->resync_min = round_down(min, 8);
4799 spin_unlock(&mddev->lock);
4803 static struct md_sysfs_entry md_min_sync =
4804 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4807 max_sync_show(struct mddev *mddev, char *page)
4809 if (mddev->resync_max == MaxSector)
4810 return sprintf(page, "max\n");
4812 return sprintf(page, "%llu\n",
4813 (unsigned long long)mddev->resync_max);
4816 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4819 spin_lock(&mddev->lock);
4820 if (strncmp(buf, "max", 3) == 0)
4821 mddev->resync_max = MaxSector;
4823 unsigned long long max;
4827 if (kstrtoull(buf, 10, &max))
4829 if (max < mddev->resync_min)
4833 if (max < mddev->resync_max &&
4835 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4838 /* Must be a multiple of chunk_size */
4839 chunk = mddev->chunk_sectors;
4841 sector_t temp = max;
4844 if (sector_div(temp, chunk))
4847 mddev->resync_max = max;
4849 wake_up(&mddev->recovery_wait);
4852 spin_unlock(&mddev->lock);
4856 static struct md_sysfs_entry md_max_sync =
4857 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4860 suspend_lo_show(struct mddev *mddev, char *page)
4862 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4866 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4868 unsigned long long new;
4871 err = kstrtoull(buf, 10, &new);
4874 if (new != (sector_t)new)
4877 err = mddev_lock(mddev);
4881 if (mddev->pers == NULL ||
4882 mddev->pers->quiesce == NULL)
4884 mddev_suspend(mddev);
4885 mddev->suspend_lo = new;
4886 mddev_resume(mddev);
4890 mddev_unlock(mddev);
4893 static struct md_sysfs_entry md_suspend_lo =
4894 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4897 suspend_hi_show(struct mddev *mddev, char *page)
4899 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4903 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4905 unsigned long long new;
4908 err = kstrtoull(buf, 10, &new);
4911 if (new != (sector_t)new)
4914 err = mddev_lock(mddev);
4918 if (mddev->pers == NULL)
4921 mddev_suspend(mddev);
4922 mddev->suspend_hi = new;
4923 mddev_resume(mddev);
4927 mddev_unlock(mddev);
4930 static struct md_sysfs_entry md_suspend_hi =
4931 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4934 reshape_position_show(struct mddev *mddev, char *page)
4936 if (mddev->reshape_position != MaxSector)
4937 return sprintf(page, "%llu\n",
4938 (unsigned long long)mddev->reshape_position);
4939 strcpy(page, "none\n");
4944 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4946 struct md_rdev *rdev;
4947 unsigned long long new;
4950 err = kstrtoull(buf, 10, &new);
4953 if (new != (sector_t)new)
4955 err = mddev_lock(mddev);
4961 mddev->reshape_position = new;
4962 mddev->delta_disks = 0;
4963 mddev->reshape_backwards = 0;
4964 mddev->new_level = mddev->level;
4965 mddev->new_layout = mddev->layout;
4966 mddev->new_chunk_sectors = mddev->chunk_sectors;
4967 rdev_for_each(rdev, mddev)
4968 rdev->new_data_offset = rdev->data_offset;
4971 mddev_unlock(mddev);
4975 static struct md_sysfs_entry md_reshape_position =
4976 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4977 reshape_position_store);
4980 reshape_direction_show(struct mddev *mddev, char *page)
4982 return sprintf(page, "%s\n",
4983 mddev->reshape_backwards ? "backwards" : "forwards");
4987 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4992 if (cmd_match(buf, "forwards"))
4994 else if (cmd_match(buf, "backwards"))
4998 if (mddev->reshape_backwards == backwards)
5001 err = mddev_lock(mddev);
5004 /* check if we are allowed to change */
5005 if (mddev->delta_disks)
5007 else if (mddev->persistent &&
5008 mddev->major_version == 0)
5011 mddev->reshape_backwards = backwards;
5012 mddev_unlock(mddev);
5016 static struct md_sysfs_entry md_reshape_direction =
5017 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5018 reshape_direction_store);
5021 array_size_show(struct mddev *mddev, char *page)
5023 if (mddev->external_size)
5024 return sprintf(page, "%llu\n",
5025 (unsigned long long)mddev->array_sectors/2);
5027 return sprintf(page, "default\n");
5031 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5036 err = mddev_lock(mddev);
5040 /* cluster raid doesn't support change array_sectors */
5041 if (mddev_is_clustered(mddev)) {
5042 mddev_unlock(mddev);
5046 if (strncmp(buf, "default", 7) == 0) {
5048 sectors = mddev->pers->size(mddev, 0, 0);
5050 sectors = mddev->array_sectors;
5052 mddev->external_size = 0;
5054 if (strict_blocks_to_sectors(buf, §ors) < 0)
5056 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5059 mddev->external_size = 1;
5063 mddev->array_sectors = sectors;
5065 set_capacity(mddev->gendisk, mddev->array_sectors);
5066 revalidate_disk(mddev->gendisk);
5069 mddev_unlock(mddev);
5073 static struct md_sysfs_entry md_array_size =
5074 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5078 consistency_policy_show(struct mddev *mddev, char *page)
5082 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5083 ret = sprintf(page, "journal\n");
5084 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5085 ret = sprintf(page, "ppl\n");
5086 } else if (mddev->bitmap) {
5087 ret = sprintf(page, "bitmap\n");
5088 } else if (mddev->pers) {
5089 if (mddev->pers->sync_request)
5090 ret = sprintf(page, "resync\n");
5092 ret = sprintf(page, "none\n");
5094 ret = sprintf(page, "unknown\n");
5101 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5106 if (mddev->pers->change_consistency_policy)
5107 err = mddev->pers->change_consistency_policy(mddev, buf);
5110 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5111 set_bit(MD_HAS_PPL, &mddev->flags);
5116 return err ? err : len;
5119 static struct md_sysfs_entry md_consistency_policy =
5120 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5121 consistency_policy_store);
5123 static struct attribute *md_default_attrs[] = {
5126 &md_raid_disks.attr,
5127 &md_chunk_size.attr,
5129 &md_resync_start.attr,
5131 &md_new_device.attr,
5132 &md_safe_delay.attr,
5133 &md_array_state.attr,
5134 &md_reshape_position.attr,
5135 &md_reshape_direction.attr,
5136 &md_array_size.attr,
5137 &max_corr_read_errors.attr,
5138 &md_consistency_policy.attr,
5142 static struct attribute *md_redundancy_attrs[] = {
5144 &md_last_scan_mode.attr,
5145 &md_mismatches.attr,
5148 &md_sync_speed.attr,
5149 &md_sync_force_parallel.attr,
5150 &md_sync_completed.attr,
5153 &md_suspend_lo.attr,
5154 &md_suspend_hi.attr,
5159 static struct attribute_group md_redundancy_group = {
5161 .attrs = md_redundancy_attrs,
5165 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5167 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5168 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5173 spin_lock(&all_mddevs_lock);
5174 if (list_empty(&mddev->all_mddevs)) {
5175 spin_unlock(&all_mddevs_lock);
5179 spin_unlock(&all_mddevs_lock);
5181 rv = entry->show(mddev, page);
5187 md_attr_store(struct kobject *kobj, struct attribute *attr,
5188 const char *page, size_t length)
5190 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5191 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5196 if (!capable(CAP_SYS_ADMIN))
5198 spin_lock(&all_mddevs_lock);
5199 if (list_empty(&mddev->all_mddevs)) {
5200 spin_unlock(&all_mddevs_lock);
5204 spin_unlock(&all_mddevs_lock);
5205 rv = entry->store(mddev, page, length);
5210 static void md_free(struct kobject *ko)
5212 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5214 if (mddev->sysfs_state)
5215 sysfs_put(mddev->sysfs_state);
5218 del_gendisk(mddev->gendisk);
5220 blk_cleanup_queue(mddev->queue);
5222 put_disk(mddev->gendisk);
5223 percpu_ref_exit(&mddev->writes_pending);
5225 bioset_exit(&mddev->bio_set);
5226 bioset_exit(&mddev->sync_set);
5230 static const struct sysfs_ops md_sysfs_ops = {
5231 .show = md_attr_show,
5232 .store = md_attr_store,
5234 static struct kobj_type md_ktype = {
5236 .sysfs_ops = &md_sysfs_ops,
5237 .default_attrs = md_default_attrs,
5242 static void mddev_delayed_delete(struct work_struct *ws)
5244 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5246 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5247 kobject_del(&mddev->kobj);
5248 kobject_put(&mddev->kobj);
5251 static void no_op(struct percpu_ref *r) {}
5253 int mddev_init_writes_pending(struct mddev *mddev)
5255 if (mddev->writes_pending.percpu_count_ptr)
5257 if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0)
5259 /* We want to start with the refcount at zero */
5260 percpu_ref_put(&mddev->writes_pending);
5263 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5265 static int md_alloc(dev_t dev, char *name)
5268 * If dev is zero, name is the name of a device to allocate with
5269 * an arbitrary minor number. It will be "md_???"
5270 * If dev is non-zero it must be a device number with a MAJOR of
5271 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5272 * the device is being created by opening a node in /dev.
5273 * If "name" is not NULL, the device is being created by
5274 * writing to /sys/module/md_mod/parameters/new_array.
5276 static DEFINE_MUTEX(disks_mutex);
5277 struct mddev *mddev = mddev_find(dev);
5278 struct gendisk *disk;
5287 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5288 shift = partitioned ? MdpMinorShift : 0;
5289 unit = MINOR(mddev->unit) >> shift;
5291 /* wait for any previous instance of this device to be
5292 * completely removed (mddev_delayed_delete).
5294 flush_workqueue(md_misc_wq);
5296 mutex_lock(&disks_mutex);
5302 /* Need to ensure that 'name' is not a duplicate.
5304 struct mddev *mddev2;
5305 spin_lock(&all_mddevs_lock);
5307 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5308 if (mddev2->gendisk &&
5309 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5310 spin_unlock(&all_mddevs_lock);
5313 spin_unlock(&all_mddevs_lock);
5317 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5319 mddev->hold_active = UNTIL_STOP;
5322 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5325 mddev->queue->queuedata = mddev;
5327 blk_queue_make_request(mddev->queue, md_make_request);
5328 blk_set_stacking_limits(&mddev->queue->limits);
5330 disk = alloc_disk(1 << shift);
5332 blk_cleanup_queue(mddev->queue);
5333 mddev->queue = NULL;
5336 disk->major = MAJOR(mddev->unit);
5337 disk->first_minor = unit << shift;
5339 strcpy(disk->disk_name, name);
5340 else if (partitioned)
5341 sprintf(disk->disk_name, "md_d%d", unit);
5343 sprintf(disk->disk_name, "md%d", unit);
5344 disk->fops = &md_fops;
5345 disk->private_data = mddev;
5346 disk->queue = mddev->queue;
5347 blk_queue_write_cache(mddev->queue, true, true);
5348 /* Allow extended partitions. This makes the
5349 * 'mdp' device redundant, but we can't really
5352 disk->flags |= GENHD_FL_EXT_DEVT;
5353 mddev->gendisk = disk;
5354 /* As soon as we call add_disk(), another thread could get
5355 * through to md_open, so make sure it doesn't get too far
5357 mutex_lock(&mddev->open_mutex);
5360 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5362 /* This isn't possible, but as kobject_init_and_add is marked
5363 * __must_check, we must do something with the result
5365 pr_debug("md: cannot register %s/md - name in use\n",
5369 if (mddev->kobj.sd &&
5370 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5371 pr_debug("pointless warning\n");
5372 mutex_unlock(&mddev->open_mutex);
5374 mutex_unlock(&disks_mutex);
5375 if (!error && mddev->kobj.sd) {
5376 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5377 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5383 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5386 md_alloc(dev, NULL);
5390 static int add_named_array(const char *val, const struct kernel_param *kp)
5393 * val must be "md_*" or "mdNNN".
5394 * For "md_*" we allocate an array with a large free minor number, and
5395 * set the name to val. val must not already be an active name.
5396 * For "mdNNN" we allocate an array with the minor number NNN
5397 * which must not already be in use.
5399 int len = strlen(val);
5400 char buf[DISK_NAME_LEN];
5401 unsigned long devnum;
5403 while (len && val[len-1] == '\n')
5405 if (len >= DISK_NAME_LEN)
5407 strlcpy(buf, val, len+1);
5408 if (strncmp(buf, "md_", 3) == 0)
5409 return md_alloc(0, buf);
5410 if (strncmp(buf, "md", 2) == 0 &&
5412 kstrtoul(buf+2, 10, &devnum) == 0 &&
5413 devnum <= MINORMASK)
5414 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5419 static void md_safemode_timeout(struct timer_list *t)
5421 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5423 mddev->safemode = 1;
5424 if (mddev->external)
5425 sysfs_notify_dirent_safe(mddev->sysfs_state);
5427 md_wakeup_thread(mddev->thread);
5430 static int start_dirty_degraded;
5432 int md_run(struct mddev *mddev)
5435 struct md_rdev *rdev;
5436 struct md_personality *pers;
5438 if (list_empty(&mddev->disks))
5439 /* cannot run an array with no devices.. */
5444 /* Cannot run until previous stop completes properly */
5445 if (mddev->sysfs_active)
5449 * Analyze all RAID superblock(s)
5451 if (!mddev->raid_disks) {
5452 if (!mddev->persistent)
5457 if (mddev->level != LEVEL_NONE)
5458 request_module("md-level-%d", mddev->level);
5459 else if (mddev->clevel[0])
5460 request_module("md-%s", mddev->clevel);
5463 * Drop all container device buffers, from now on
5464 * the only valid external interface is through the md
5467 mddev->has_superblocks = false;
5468 rdev_for_each(rdev, mddev) {
5469 if (test_bit(Faulty, &rdev->flags))
5471 sync_blockdev(rdev->bdev);
5472 invalidate_bdev(rdev->bdev);
5473 if (mddev->ro != 1 &&
5474 (bdev_read_only(rdev->bdev) ||
5475 bdev_read_only(rdev->meta_bdev))) {
5478 set_disk_ro(mddev->gendisk, 1);
5482 mddev->has_superblocks = true;
5484 /* perform some consistency tests on the device.
5485 * We don't want the data to overlap the metadata,
5486 * Internal Bitmap issues have been handled elsewhere.
5488 if (rdev->meta_bdev) {
5489 /* Nothing to check */;
5490 } else if (rdev->data_offset < rdev->sb_start) {
5491 if (mddev->dev_sectors &&
5492 rdev->data_offset + mddev->dev_sectors
5494 pr_warn("md: %s: data overlaps metadata\n",
5499 if (rdev->sb_start + rdev->sb_size/512
5500 > rdev->data_offset) {
5501 pr_warn("md: %s: metadata overlaps data\n",
5506 sysfs_notify_dirent_safe(rdev->sysfs_state);
5509 if (!bioset_initialized(&mddev->bio_set)) {
5510 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5514 if (!bioset_initialized(&mddev->sync_set)) {
5515 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5519 if (mddev->flush_pool == NULL) {
5520 mddev->flush_pool = mempool_create(NR_FLUSH_INFOS, flush_info_alloc,
5521 flush_info_free, mddev);
5522 if (!mddev->flush_pool) {
5527 if (mddev->flush_bio_pool == NULL) {
5528 mddev->flush_bio_pool = mempool_create(NR_FLUSH_BIOS, flush_bio_alloc,
5529 flush_bio_free, mddev);
5530 if (!mddev->flush_bio_pool) {
5536 spin_lock(&pers_lock);
5537 pers = find_pers(mddev->level, mddev->clevel);
5538 if (!pers || !try_module_get(pers->owner)) {
5539 spin_unlock(&pers_lock);
5540 if (mddev->level != LEVEL_NONE)
5541 pr_warn("md: personality for level %d is not loaded!\n",
5544 pr_warn("md: personality for level %s is not loaded!\n",
5549 spin_unlock(&pers_lock);
5550 if (mddev->level != pers->level) {
5551 mddev->level = pers->level;
5552 mddev->new_level = pers->level;
5554 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5556 if (mddev->reshape_position != MaxSector &&
5557 pers->start_reshape == NULL) {
5558 /* This personality cannot handle reshaping... */
5559 module_put(pers->owner);
5564 if (pers->sync_request) {
5565 /* Warn if this is a potentially silly
5568 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5569 struct md_rdev *rdev2;
5572 rdev_for_each(rdev, mddev)
5573 rdev_for_each(rdev2, mddev) {
5575 rdev->bdev->bd_contains ==
5576 rdev2->bdev->bd_contains) {
5577 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5579 bdevname(rdev->bdev,b),
5580 bdevname(rdev2->bdev,b2));
5586 pr_warn("True protection against single-disk failure might be compromised.\n");
5589 mddev->recovery = 0;
5590 /* may be over-ridden by personality */
5591 mddev->resync_max_sectors = mddev->dev_sectors;
5593 mddev->ok_start_degraded = start_dirty_degraded;
5595 if (start_readonly && mddev->ro == 0)
5596 mddev->ro = 2; /* read-only, but switch on first write */
5598 err = pers->run(mddev);
5600 pr_warn("md: pers->run() failed ...\n");
5601 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5602 WARN_ONCE(!mddev->external_size,
5603 "%s: default size too small, but 'external_size' not in effect?\n",
5605 pr_warn("md: invalid array_size %llu > default size %llu\n",
5606 (unsigned long long)mddev->array_sectors / 2,
5607 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5610 if (err == 0 && pers->sync_request &&
5611 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5612 struct bitmap *bitmap;
5614 bitmap = md_bitmap_create(mddev, -1);
5615 if (IS_ERR(bitmap)) {
5616 err = PTR_ERR(bitmap);
5617 pr_warn("%s: failed to create bitmap (%d)\n",
5618 mdname(mddev), err);
5620 mddev->bitmap = bitmap;
5624 mddev_detach(mddev);
5626 pers->free(mddev, mddev->private);
5627 mddev->private = NULL;
5628 module_put(pers->owner);
5629 md_bitmap_destroy(mddev);
5635 rdev_for_each(rdev, mddev) {
5636 if (rdev->raid_disk >= 0 &&
5637 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5642 if (mddev->degraded)
5645 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5647 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5648 mddev->queue->backing_dev_info->congested_data = mddev;
5649 mddev->queue->backing_dev_info->congested_fn = md_congested;
5651 if (pers->sync_request) {
5652 if (mddev->kobj.sd &&
5653 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5654 pr_warn("md: cannot register extra attributes for %s\n",
5656 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5657 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5660 atomic_set(&mddev->max_corr_read_errors,
5661 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5662 mddev->safemode = 0;
5663 if (mddev_is_clustered(mddev))
5664 mddev->safemode_delay = 0;
5666 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5669 spin_lock(&mddev->lock);
5671 spin_unlock(&mddev->lock);
5672 rdev_for_each(rdev, mddev)
5673 if (rdev->raid_disk >= 0)
5674 if (sysfs_link_rdev(mddev, rdev))
5675 /* failure here is OK */;
5677 if (mddev->degraded && !mddev->ro)
5678 /* This ensures that recovering status is reported immediately
5679 * via sysfs - until a lack of spares is confirmed.
5681 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5682 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5684 if (mddev->sb_flags)
5685 md_update_sb(mddev, 0);
5687 md_new_event(mddev);
5688 sysfs_notify_dirent_safe(mddev->sysfs_state);
5689 sysfs_notify_dirent_safe(mddev->sysfs_action);
5690 sysfs_notify(&mddev->kobj, NULL, "degraded");
5694 mempool_destroy(mddev->flush_bio_pool);
5695 mddev->flush_bio_pool = NULL;
5696 mempool_destroy(mddev->flush_pool);
5697 mddev->flush_pool = NULL;
5701 EXPORT_SYMBOL_GPL(md_run);
5703 static int do_md_run(struct mddev *mddev)
5707 err = md_run(mddev);
5710 err = md_bitmap_load(mddev);
5712 md_bitmap_destroy(mddev);
5716 if (mddev_is_clustered(mddev))
5717 md_allow_write(mddev);
5719 /* run start up tasks that require md_thread */
5722 md_wakeup_thread(mddev->thread);
5723 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5725 set_capacity(mddev->gendisk, mddev->array_sectors);
5726 revalidate_disk(mddev->gendisk);
5728 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5733 int md_start(struct mddev *mddev)
5737 if (mddev->pers->start) {
5738 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5739 md_wakeup_thread(mddev->thread);
5740 ret = mddev->pers->start(mddev);
5741 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5742 md_wakeup_thread(mddev->sync_thread);
5746 EXPORT_SYMBOL_GPL(md_start);
5748 static int restart_array(struct mddev *mddev)
5750 struct gendisk *disk = mddev->gendisk;
5751 struct md_rdev *rdev;
5752 bool has_journal = false;
5753 bool has_readonly = false;
5755 /* Complain if it has no devices */
5756 if (list_empty(&mddev->disks))
5764 rdev_for_each_rcu(rdev, mddev) {
5765 if (test_bit(Journal, &rdev->flags) &&
5766 !test_bit(Faulty, &rdev->flags))
5768 if (bdev_read_only(rdev->bdev))
5769 has_readonly = true;
5772 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5773 /* Don't restart rw with journal missing/faulty */
5778 mddev->safemode = 0;
5780 set_disk_ro(disk, 0);
5781 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5782 /* Kick recovery or resync if necessary */
5783 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5784 md_wakeup_thread(mddev->thread);
5785 md_wakeup_thread(mddev->sync_thread);
5786 sysfs_notify_dirent_safe(mddev->sysfs_state);
5790 static void md_clean(struct mddev *mddev)
5792 mddev->array_sectors = 0;
5793 mddev->external_size = 0;
5794 mddev->dev_sectors = 0;
5795 mddev->raid_disks = 0;
5796 mddev->recovery_cp = 0;
5797 mddev->resync_min = 0;
5798 mddev->resync_max = MaxSector;
5799 mddev->reshape_position = MaxSector;
5800 mddev->external = 0;
5801 mddev->persistent = 0;
5802 mddev->level = LEVEL_NONE;
5803 mddev->clevel[0] = 0;
5805 mddev->sb_flags = 0;
5807 mddev->metadata_type[0] = 0;
5808 mddev->chunk_sectors = 0;
5809 mddev->ctime = mddev->utime = 0;
5811 mddev->max_disks = 0;
5813 mddev->can_decrease_events = 0;
5814 mddev->delta_disks = 0;
5815 mddev->reshape_backwards = 0;
5816 mddev->new_level = LEVEL_NONE;
5817 mddev->new_layout = 0;
5818 mddev->new_chunk_sectors = 0;
5819 mddev->curr_resync = 0;
5820 atomic64_set(&mddev->resync_mismatches, 0);
5821 mddev->suspend_lo = mddev->suspend_hi = 0;
5822 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5823 mddev->recovery = 0;
5826 mddev->degraded = 0;
5827 mddev->safemode = 0;
5828 mddev->private = NULL;
5829 mddev->cluster_info = NULL;
5830 mddev->bitmap_info.offset = 0;
5831 mddev->bitmap_info.default_offset = 0;
5832 mddev->bitmap_info.default_space = 0;
5833 mddev->bitmap_info.chunksize = 0;
5834 mddev->bitmap_info.daemon_sleep = 0;
5835 mddev->bitmap_info.max_write_behind = 0;
5836 mddev->bitmap_info.nodes = 0;
5839 static void __md_stop_writes(struct mddev *mddev)
5841 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5842 flush_workqueue(md_misc_wq);
5843 if (mddev->sync_thread) {
5844 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5845 md_reap_sync_thread(mddev);
5848 del_timer_sync(&mddev->safemode_timer);
5850 if (mddev->pers && mddev->pers->quiesce) {
5851 mddev->pers->quiesce(mddev, 1);
5852 mddev->pers->quiesce(mddev, 0);
5854 md_bitmap_flush(mddev);
5856 if (mddev->ro == 0 &&
5857 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5859 /* mark array as shutdown cleanly */
5860 if (!mddev_is_clustered(mddev))
5862 md_update_sb(mddev, 1);
5866 void md_stop_writes(struct mddev *mddev)
5868 mddev_lock_nointr(mddev);
5869 __md_stop_writes(mddev);
5870 mddev_unlock(mddev);
5872 EXPORT_SYMBOL_GPL(md_stop_writes);
5874 static void mddev_detach(struct mddev *mddev)
5876 md_bitmap_wait_behind_writes(mddev);
5877 if (mddev->pers && mddev->pers->quiesce) {
5878 mddev->pers->quiesce(mddev, 1);
5879 mddev->pers->quiesce(mddev, 0);
5881 md_unregister_thread(&mddev->thread);
5883 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5886 static void __md_stop(struct mddev *mddev)
5888 struct md_personality *pers = mddev->pers;
5889 md_bitmap_destroy(mddev);
5890 mddev_detach(mddev);
5891 /* Ensure ->event_work is done */
5892 flush_workqueue(md_misc_wq);
5893 spin_lock(&mddev->lock);
5895 spin_unlock(&mddev->lock);
5896 pers->free(mddev, mddev->private);
5897 mddev->private = NULL;
5898 if (pers->sync_request && mddev->to_remove == NULL)
5899 mddev->to_remove = &md_redundancy_group;
5900 module_put(pers->owner);
5901 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5902 if (mddev->flush_bio_pool) {
5903 mempool_destroy(mddev->flush_bio_pool);
5904 mddev->flush_bio_pool = NULL;
5906 if (mddev->flush_pool) {
5907 mempool_destroy(mddev->flush_pool);
5908 mddev->flush_pool = NULL;
5912 void md_stop(struct mddev *mddev)
5914 /* stop the array and free an attached data structures.
5915 * This is called from dm-raid
5918 bioset_exit(&mddev->bio_set);
5919 bioset_exit(&mddev->sync_set);
5922 EXPORT_SYMBOL_GPL(md_stop);
5924 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5929 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5931 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5932 md_wakeup_thread(mddev->thread);
5934 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5935 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5936 if (mddev->sync_thread)
5937 /* Thread might be blocked waiting for metadata update
5938 * which will now never happen */
5939 wake_up_process(mddev->sync_thread->tsk);
5941 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
5943 mddev_unlock(mddev);
5944 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5946 wait_event(mddev->sb_wait,
5947 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
5948 mddev_lock_nointr(mddev);
5950 mutex_lock(&mddev->open_mutex);
5951 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5952 mddev->sync_thread ||
5953 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5954 pr_warn("md: %s still in use.\n",mdname(mddev));
5956 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5957 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5958 md_wakeup_thread(mddev->thread);
5964 __md_stop_writes(mddev);
5970 set_disk_ro(mddev->gendisk, 1);
5971 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5972 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5973 md_wakeup_thread(mddev->thread);
5974 sysfs_notify_dirent_safe(mddev->sysfs_state);
5978 mutex_unlock(&mddev->open_mutex);
5983 * 0 - completely stop and dis-assemble array
5984 * 2 - stop but do not disassemble array
5986 static int do_md_stop(struct mddev *mddev, int mode,
5987 struct block_device *bdev)
5989 struct gendisk *disk = mddev->gendisk;
5990 struct md_rdev *rdev;
5993 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5995 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5996 md_wakeup_thread(mddev->thread);
5998 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5999 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6000 if (mddev->sync_thread)
6001 /* Thread might be blocked waiting for metadata update
6002 * which will now never happen */
6003 wake_up_process(mddev->sync_thread->tsk);
6005 mddev_unlock(mddev);
6006 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6007 !test_bit(MD_RECOVERY_RUNNING,
6008 &mddev->recovery)));
6009 mddev_lock_nointr(mddev);
6011 mutex_lock(&mddev->open_mutex);
6012 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6013 mddev->sysfs_active ||
6014 mddev->sync_thread ||
6015 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6016 pr_warn("md: %s still in use.\n",mdname(mddev));
6017 mutex_unlock(&mddev->open_mutex);
6019 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6020 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6021 md_wakeup_thread(mddev->thread);
6027 set_disk_ro(disk, 0);
6029 __md_stop_writes(mddev);
6031 mddev->queue->backing_dev_info->congested_fn = NULL;
6033 /* tell userspace to handle 'inactive' */
6034 sysfs_notify_dirent_safe(mddev->sysfs_state);
6036 rdev_for_each(rdev, mddev)
6037 if (rdev->raid_disk >= 0)
6038 sysfs_unlink_rdev(mddev, rdev);
6040 set_capacity(disk, 0);
6041 mutex_unlock(&mddev->open_mutex);
6043 revalidate_disk(disk);
6048 mutex_unlock(&mddev->open_mutex);
6050 * Free resources if final stop
6053 pr_info("md: %s stopped.\n", mdname(mddev));
6055 if (mddev->bitmap_info.file) {
6056 struct file *f = mddev->bitmap_info.file;
6057 spin_lock(&mddev->lock);
6058 mddev->bitmap_info.file = NULL;
6059 spin_unlock(&mddev->lock);
6062 mddev->bitmap_info.offset = 0;
6064 export_array(mddev);
6067 if (mddev->hold_active == UNTIL_STOP)
6068 mddev->hold_active = 0;
6070 md_new_event(mddev);
6071 sysfs_notify_dirent_safe(mddev->sysfs_state);
6076 static void autorun_array(struct mddev *mddev)
6078 struct md_rdev *rdev;
6081 if (list_empty(&mddev->disks))
6084 pr_info("md: running: ");
6086 rdev_for_each(rdev, mddev) {
6087 char b[BDEVNAME_SIZE];
6088 pr_cont("<%s>", bdevname(rdev->bdev,b));
6092 err = do_md_run(mddev);
6094 pr_warn("md: do_md_run() returned %d\n", err);
6095 do_md_stop(mddev, 0, NULL);
6100 * lets try to run arrays based on all disks that have arrived
6101 * until now. (those are in pending_raid_disks)
6103 * the method: pick the first pending disk, collect all disks with
6104 * the same UUID, remove all from the pending list and put them into
6105 * the 'same_array' list. Then order this list based on superblock
6106 * update time (freshest comes first), kick out 'old' disks and
6107 * compare superblocks. If everything's fine then run it.
6109 * If "unit" is allocated, then bump its reference count
6111 static void autorun_devices(int part)
6113 struct md_rdev *rdev0, *rdev, *tmp;
6114 struct mddev *mddev;
6115 char b[BDEVNAME_SIZE];
6117 pr_info("md: autorun ...\n");
6118 while (!list_empty(&pending_raid_disks)) {
6121 LIST_HEAD(candidates);
6122 rdev0 = list_entry(pending_raid_disks.next,
6123 struct md_rdev, same_set);
6125 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6126 INIT_LIST_HEAD(&candidates);
6127 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6128 if (super_90_load(rdev, rdev0, 0) >= 0) {
6129 pr_debug("md: adding %s ...\n",
6130 bdevname(rdev->bdev,b));
6131 list_move(&rdev->same_set, &candidates);
6134 * now we have a set of devices, with all of them having
6135 * mostly sane superblocks. It's time to allocate the
6139 dev = MKDEV(mdp_major,
6140 rdev0->preferred_minor << MdpMinorShift);
6141 unit = MINOR(dev) >> MdpMinorShift;
6143 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6146 if (rdev0->preferred_minor != unit) {
6147 pr_warn("md: unit number in %s is bad: %d\n",
6148 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6152 md_probe(dev, NULL, NULL);
6153 mddev = mddev_find(dev);
6154 if (!mddev || !mddev->gendisk) {
6159 if (mddev_lock(mddev))
6160 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6161 else if (mddev->raid_disks || mddev->major_version
6162 || !list_empty(&mddev->disks)) {
6163 pr_warn("md: %s already running, cannot run %s\n",
6164 mdname(mddev), bdevname(rdev0->bdev,b));
6165 mddev_unlock(mddev);
6167 pr_debug("md: created %s\n", mdname(mddev));
6168 mddev->persistent = 1;
6169 rdev_for_each_list(rdev, tmp, &candidates) {
6170 list_del_init(&rdev->same_set);
6171 if (bind_rdev_to_array(rdev, mddev))
6174 autorun_array(mddev);
6175 mddev_unlock(mddev);
6177 /* on success, candidates will be empty, on error
6180 rdev_for_each_list(rdev, tmp, &candidates) {
6181 list_del_init(&rdev->same_set);
6186 pr_info("md: ... autorun DONE.\n");
6188 #endif /* !MODULE */
6190 static int get_version(void __user *arg)
6194 ver.major = MD_MAJOR_VERSION;
6195 ver.minor = MD_MINOR_VERSION;
6196 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6198 if (copy_to_user(arg, &ver, sizeof(ver)))
6204 static int get_array_info(struct mddev *mddev, void __user *arg)
6206 mdu_array_info_t info;
6207 int nr,working,insync,failed,spare;
6208 struct md_rdev *rdev;
6210 nr = working = insync = failed = spare = 0;
6212 rdev_for_each_rcu(rdev, mddev) {
6214 if (test_bit(Faulty, &rdev->flags))
6218 if (test_bit(In_sync, &rdev->flags))
6220 else if (test_bit(Journal, &rdev->flags))
6221 /* TODO: add journal count to md_u.h */
6229 info.major_version = mddev->major_version;
6230 info.minor_version = mddev->minor_version;
6231 info.patch_version = MD_PATCHLEVEL_VERSION;
6232 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6233 info.level = mddev->level;
6234 info.size = mddev->dev_sectors / 2;
6235 if (info.size != mddev->dev_sectors / 2) /* overflow */
6238 info.raid_disks = mddev->raid_disks;
6239 info.md_minor = mddev->md_minor;
6240 info.not_persistent= !mddev->persistent;
6242 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6245 info.state = (1<<MD_SB_CLEAN);
6246 if (mddev->bitmap && mddev->bitmap_info.offset)
6247 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6248 if (mddev_is_clustered(mddev))
6249 info.state |= (1<<MD_SB_CLUSTERED);
6250 info.active_disks = insync;
6251 info.working_disks = working;
6252 info.failed_disks = failed;
6253 info.spare_disks = spare;
6255 info.layout = mddev->layout;
6256 info.chunk_size = mddev->chunk_sectors << 9;
6258 if (copy_to_user(arg, &info, sizeof(info)))
6264 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6266 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6270 file = kzalloc(sizeof(*file), GFP_NOIO);
6275 spin_lock(&mddev->lock);
6276 /* bitmap enabled */
6277 if (mddev->bitmap_info.file) {
6278 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6279 sizeof(file->pathname));
6283 memmove(file->pathname, ptr,
6284 sizeof(file->pathname)-(ptr-file->pathname));
6286 spin_unlock(&mddev->lock);
6289 copy_to_user(arg, file, sizeof(*file)))
6296 static int get_disk_info(struct mddev *mddev, void __user * arg)
6298 mdu_disk_info_t info;
6299 struct md_rdev *rdev;
6301 if (copy_from_user(&info, arg, sizeof(info)))
6305 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6307 info.major = MAJOR(rdev->bdev->bd_dev);
6308 info.minor = MINOR(rdev->bdev->bd_dev);
6309 info.raid_disk = rdev->raid_disk;
6311 if (test_bit(Faulty, &rdev->flags))
6312 info.state |= (1<<MD_DISK_FAULTY);
6313 else if (test_bit(In_sync, &rdev->flags)) {
6314 info.state |= (1<<MD_DISK_ACTIVE);
6315 info.state |= (1<<MD_DISK_SYNC);
6317 if (test_bit(Journal, &rdev->flags))
6318 info.state |= (1<<MD_DISK_JOURNAL);
6319 if (test_bit(WriteMostly, &rdev->flags))
6320 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6321 if (test_bit(FailFast, &rdev->flags))
6322 info.state |= (1<<MD_DISK_FAILFAST);
6324 info.major = info.minor = 0;
6325 info.raid_disk = -1;
6326 info.state = (1<<MD_DISK_REMOVED);
6330 if (copy_to_user(arg, &info, sizeof(info)))
6336 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6338 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6339 struct md_rdev *rdev;
6340 dev_t dev = MKDEV(info->major,info->minor);
6342 if (mddev_is_clustered(mddev) &&
6343 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6344 pr_warn("%s: Cannot add to clustered mddev.\n",
6349 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6352 if (!mddev->raid_disks) {
6354 /* expecting a device which has a superblock */
6355 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6357 pr_warn("md: md_import_device returned %ld\n",
6359 return PTR_ERR(rdev);
6361 if (!list_empty(&mddev->disks)) {
6362 struct md_rdev *rdev0
6363 = list_entry(mddev->disks.next,
6364 struct md_rdev, same_set);
6365 err = super_types[mddev->major_version]
6366 .load_super(rdev, rdev0, mddev->minor_version);
6368 pr_warn("md: %s has different UUID to %s\n",
6369 bdevname(rdev->bdev,b),
6370 bdevname(rdev0->bdev,b2));
6375 err = bind_rdev_to_array(rdev, mddev);
6382 * add_new_disk can be used once the array is assembled
6383 * to add "hot spares". They must already have a superblock
6388 if (!mddev->pers->hot_add_disk) {
6389 pr_warn("%s: personality does not support diskops!\n",
6393 if (mddev->persistent)
6394 rdev = md_import_device(dev, mddev->major_version,
6395 mddev->minor_version);
6397 rdev = md_import_device(dev, -1, -1);
6399 pr_warn("md: md_import_device returned %ld\n",
6401 return PTR_ERR(rdev);
6403 /* set saved_raid_disk if appropriate */
6404 if (!mddev->persistent) {
6405 if (info->state & (1<<MD_DISK_SYNC) &&
6406 info->raid_disk < mddev->raid_disks) {
6407 rdev->raid_disk = info->raid_disk;
6408 set_bit(In_sync, &rdev->flags);
6409 clear_bit(Bitmap_sync, &rdev->flags);
6411 rdev->raid_disk = -1;
6412 rdev->saved_raid_disk = rdev->raid_disk;
6414 super_types[mddev->major_version].
6415 validate_super(mddev, rdev);
6416 if ((info->state & (1<<MD_DISK_SYNC)) &&
6417 rdev->raid_disk != info->raid_disk) {
6418 /* This was a hot-add request, but events doesn't
6419 * match, so reject it.
6425 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6426 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6427 set_bit(WriteMostly, &rdev->flags);
6429 clear_bit(WriteMostly, &rdev->flags);
6430 if (info->state & (1<<MD_DISK_FAILFAST))
6431 set_bit(FailFast, &rdev->flags);
6433 clear_bit(FailFast, &rdev->flags);
6435 if (info->state & (1<<MD_DISK_JOURNAL)) {
6436 struct md_rdev *rdev2;
6437 bool has_journal = false;
6439 /* make sure no existing journal disk */
6440 rdev_for_each(rdev2, mddev) {
6441 if (test_bit(Journal, &rdev2->flags)) {
6446 if (has_journal || mddev->bitmap) {
6450 set_bit(Journal, &rdev->flags);
6453 * check whether the device shows up in other nodes
6455 if (mddev_is_clustered(mddev)) {
6456 if (info->state & (1 << MD_DISK_CANDIDATE))
6457 set_bit(Candidate, &rdev->flags);
6458 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6459 /* --add initiated by this node */
6460 err = md_cluster_ops->add_new_disk(mddev, rdev);
6468 rdev->raid_disk = -1;
6469 err = bind_rdev_to_array(rdev, mddev);
6474 if (mddev_is_clustered(mddev)) {
6475 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6477 err = md_cluster_ops->new_disk_ack(mddev,
6480 md_kick_rdev_from_array(rdev);
6484 md_cluster_ops->add_new_disk_cancel(mddev);
6486 err = add_bound_rdev(rdev);
6490 err = add_bound_rdev(rdev);
6495 /* otherwise, add_new_disk is only allowed
6496 * for major_version==0 superblocks
6498 if (mddev->major_version != 0) {
6499 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6503 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6505 rdev = md_import_device(dev, -1, 0);
6507 pr_warn("md: error, md_import_device() returned %ld\n",
6509 return PTR_ERR(rdev);
6511 rdev->desc_nr = info->number;
6512 if (info->raid_disk < mddev->raid_disks)
6513 rdev->raid_disk = info->raid_disk;
6515 rdev->raid_disk = -1;
6517 if (rdev->raid_disk < mddev->raid_disks)
6518 if (info->state & (1<<MD_DISK_SYNC))
6519 set_bit(In_sync, &rdev->flags);
6521 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6522 set_bit(WriteMostly, &rdev->flags);
6523 if (info->state & (1<<MD_DISK_FAILFAST))
6524 set_bit(FailFast, &rdev->flags);
6526 if (!mddev->persistent) {
6527 pr_debug("md: nonpersistent superblock ...\n");
6528 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6530 rdev->sb_start = calc_dev_sboffset(rdev);
6531 rdev->sectors = rdev->sb_start;
6533 err = bind_rdev_to_array(rdev, mddev);
6543 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6545 char b[BDEVNAME_SIZE];
6546 struct md_rdev *rdev;
6551 rdev = find_rdev(mddev, dev);
6555 if (rdev->raid_disk < 0)
6558 clear_bit(Blocked, &rdev->flags);
6559 remove_and_add_spares(mddev, rdev);
6561 if (rdev->raid_disk >= 0)
6565 if (mddev_is_clustered(mddev))
6566 md_cluster_ops->remove_disk(mddev, rdev);
6568 md_kick_rdev_from_array(rdev);
6569 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6571 md_wakeup_thread(mddev->thread);
6573 md_update_sb(mddev, 1);
6574 md_new_event(mddev);
6578 pr_debug("md: cannot remove active disk %s from %s ...\n",
6579 bdevname(rdev->bdev,b), mdname(mddev));
6583 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6585 char b[BDEVNAME_SIZE];
6587 struct md_rdev *rdev;
6592 if (mddev->major_version != 0) {
6593 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6597 if (!mddev->pers->hot_add_disk) {
6598 pr_warn("%s: personality does not support diskops!\n",
6603 rdev = md_import_device(dev, -1, 0);
6605 pr_warn("md: error, md_import_device() returned %ld\n",
6610 if (mddev->persistent)
6611 rdev->sb_start = calc_dev_sboffset(rdev);
6613 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6615 rdev->sectors = rdev->sb_start;
6617 if (test_bit(Faulty, &rdev->flags)) {
6618 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6619 bdevname(rdev->bdev,b), mdname(mddev));
6624 clear_bit(In_sync, &rdev->flags);
6626 rdev->saved_raid_disk = -1;
6627 err = bind_rdev_to_array(rdev, mddev);
6632 * The rest should better be atomic, we can have disk failures
6633 * noticed in interrupt contexts ...
6636 rdev->raid_disk = -1;
6638 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6640 md_update_sb(mddev, 1);
6642 * Kick recovery, maybe this spare has to be added to the
6643 * array immediately.
6645 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6646 md_wakeup_thread(mddev->thread);
6647 md_new_event(mddev);
6655 static int set_bitmap_file(struct mddev *mddev, int fd)
6660 if (!mddev->pers->quiesce || !mddev->thread)
6662 if (mddev->recovery || mddev->sync_thread)
6664 /* we should be able to change the bitmap.. */
6668 struct inode *inode;
6671 if (mddev->bitmap || mddev->bitmap_info.file)
6672 return -EEXIST; /* cannot add when bitmap is present */
6676 pr_warn("%s: error: failed to get bitmap file\n",
6681 inode = f->f_mapping->host;
6682 if (!S_ISREG(inode->i_mode)) {
6683 pr_warn("%s: error: bitmap file must be a regular file\n",
6686 } else if (!(f->f_mode & FMODE_WRITE)) {
6687 pr_warn("%s: error: bitmap file must open for write\n",
6690 } else if (atomic_read(&inode->i_writecount) != 1) {
6691 pr_warn("%s: error: bitmap file is already in use\n",
6699 mddev->bitmap_info.file = f;
6700 mddev->bitmap_info.offset = 0; /* file overrides offset */
6701 } else if (mddev->bitmap == NULL)
6702 return -ENOENT; /* cannot remove what isn't there */
6706 struct bitmap *bitmap;
6708 bitmap = md_bitmap_create(mddev, -1);
6709 mddev_suspend(mddev);
6710 if (!IS_ERR(bitmap)) {
6711 mddev->bitmap = bitmap;
6712 err = md_bitmap_load(mddev);
6714 err = PTR_ERR(bitmap);
6716 md_bitmap_destroy(mddev);
6719 mddev_resume(mddev);
6720 } else if (fd < 0) {
6721 mddev_suspend(mddev);
6722 md_bitmap_destroy(mddev);
6723 mddev_resume(mddev);
6727 struct file *f = mddev->bitmap_info.file;
6729 spin_lock(&mddev->lock);
6730 mddev->bitmap_info.file = NULL;
6731 spin_unlock(&mddev->lock);
6740 * set_array_info is used two different ways
6741 * The original usage is when creating a new array.
6742 * In this usage, raid_disks is > 0 and it together with
6743 * level, size, not_persistent,layout,chunksize determine the
6744 * shape of the array.
6745 * This will always create an array with a type-0.90.0 superblock.
6746 * The newer usage is when assembling an array.
6747 * In this case raid_disks will be 0, and the major_version field is
6748 * use to determine which style super-blocks are to be found on the devices.
6749 * The minor and patch _version numbers are also kept incase the
6750 * super_block handler wishes to interpret them.
6752 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6755 if (info->raid_disks == 0) {
6756 /* just setting version number for superblock loading */
6757 if (info->major_version < 0 ||
6758 info->major_version >= ARRAY_SIZE(super_types) ||
6759 super_types[info->major_version].name == NULL) {
6760 /* maybe try to auto-load a module? */
6761 pr_warn("md: superblock version %d not known\n",
6762 info->major_version);
6765 mddev->major_version = info->major_version;
6766 mddev->minor_version = info->minor_version;
6767 mddev->patch_version = info->patch_version;
6768 mddev->persistent = !info->not_persistent;
6769 /* ensure mddev_put doesn't delete this now that there
6770 * is some minimal configuration.
6772 mddev->ctime = ktime_get_real_seconds();
6775 mddev->major_version = MD_MAJOR_VERSION;
6776 mddev->minor_version = MD_MINOR_VERSION;
6777 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6778 mddev->ctime = ktime_get_real_seconds();
6780 mddev->level = info->level;
6781 mddev->clevel[0] = 0;
6782 mddev->dev_sectors = 2 * (sector_t)info->size;
6783 mddev->raid_disks = info->raid_disks;
6784 /* don't set md_minor, it is determined by which /dev/md* was
6787 if (info->state & (1<<MD_SB_CLEAN))
6788 mddev->recovery_cp = MaxSector;
6790 mddev->recovery_cp = 0;
6791 mddev->persistent = ! info->not_persistent;
6792 mddev->external = 0;
6794 mddev->layout = info->layout;
6795 mddev->chunk_sectors = info->chunk_size >> 9;
6797 if (mddev->persistent) {
6798 mddev->max_disks = MD_SB_DISKS;
6800 mddev->sb_flags = 0;
6802 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6804 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6805 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6806 mddev->bitmap_info.offset = 0;
6808 mddev->reshape_position = MaxSector;
6811 * Generate a 128 bit UUID
6813 get_random_bytes(mddev->uuid, 16);
6815 mddev->new_level = mddev->level;
6816 mddev->new_chunk_sectors = mddev->chunk_sectors;
6817 mddev->new_layout = mddev->layout;
6818 mddev->delta_disks = 0;
6819 mddev->reshape_backwards = 0;
6824 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6826 lockdep_assert_held(&mddev->reconfig_mutex);
6828 if (mddev->external_size)
6831 mddev->array_sectors = array_sectors;
6833 EXPORT_SYMBOL(md_set_array_sectors);
6835 static int update_size(struct mddev *mddev, sector_t num_sectors)
6837 struct md_rdev *rdev;
6839 int fit = (num_sectors == 0);
6840 sector_t old_dev_sectors = mddev->dev_sectors;
6842 if (mddev->pers->resize == NULL)
6844 /* The "num_sectors" is the number of sectors of each device that
6845 * is used. This can only make sense for arrays with redundancy.
6846 * linear and raid0 always use whatever space is available. We can only
6847 * consider changing this number if no resync or reconstruction is
6848 * happening, and if the new size is acceptable. It must fit before the
6849 * sb_start or, if that is <data_offset, it must fit before the size
6850 * of each device. If num_sectors is zero, we find the largest size
6853 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6859 rdev_for_each(rdev, mddev) {
6860 sector_t avail = rdev->sectors;
6862 if (fit && (num_sectors == 0 || num_sectors > avail))
6863 num_sectors = avail;
6864 if (avail < num_sectors)
6867 rv = mddev->pers->resize(mddev, num_sectors);
6869 if (mddev_is_clustered(mddev))
6870 md_cluster_ops->update_size(mddev, old_dev_sectors);
6871 else if (mddev->queue) {
6872 set_capacity(mddev->gendisk, mddev->array_sectors);
6873 revalidate_disk(mddev->gendisk);
6879 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6882 struct md_rdev *rdev;
6883 /* change the number of raid disks */
6884 if (mddev->pers->check_reshape == NULL)
6888 if (raid_disks <= 0 ||
6889 (mddev->max_disks && raid_disks >= mddev->max_disks))
6891 if (mddev->sync_thread ||
6892 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6893 mddev->reshape_position != MaxSector)
6896 rdev_for_each(rdev, mddev) {
6897 if (mddev->raid_disks < raid_disks &&
6898 rdev->data_offset < rdev->new_data_offset)
6900 if (mddev->raid_disks > raid_disks &&
6901 rdev->data_offset > rdev->new_data_offset)
6905 mddev->delta_disks = raid_disks - mddev->raid_disks;
6906 if (mddev->delta_disks < 0)
6907 mddev->reshape_backwards = 1;
6908 else if (mddev->delta_disks > 0)
6909 mddev->reshape_backwards = 0;
6911 rv = mddev->pers->check_reshape(mddev);
6913 mddev->delta_disks = 0;
6914 mddev->reshape_backwards = 0;
6920 * update_array_info is used to change the configuration of an
6922 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6923 * fields in the info are checked against the array.
6924 * Any differences that cannot be handled will cause an error.
6925 * Normally, only one change can be managed at a time.
6927 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6933 /* calculate expected state,ignoring low bits */
6934 if (mddev->bitmap && mddev->bitmap_info.offset)
6935 state |= (1 << MD_SB_BITMAP_PRESENT);
6937 if (mddev->major_version != info->major_version ||
6938 mddev->minor_version != info->minor_version ||
6939 /* mddev->patch_version != info->patch_version || */
6940 mddev->ctime != info->ctime ||
6941 mddev->level != info->level ||
6942 /* mddev->layout != info->layout || */
6943 mddev->persistent != !info->not_persistent ||
6944 mddev->chunk_sectors != info->chunk_size >> 9 ||
6945 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6946 ((state^info->state) & 0xfffffe00)
6949 /* Check there is only one change */
6950 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6952 if (mddev->raid_disks != info->raid_disks)
6954 if (mddev->layout != info->layout)
6956 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6963 if (mddev->layout != info->layout) {
6965 * we don't need to do anything at the md level, the
6966 * personality will take care of it all.
6968 if (mddev->pers->check_reshape == NULL)
6971 mddev->new_layout = info->layout;
6972 rv = mddev->pers->check_reshape(mddev);
6974 mddev->new_layout = mddev->layout;
6978 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6979 rv = update_size(mddev, (sector_t)info->size * 2);
6981 if (mddev->raid_disks != info->raid_disks)
6982 rv = update_raid_disks(mddev, info->raid_disks);
6984 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6985 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6989 if (mddev->recovery || mddev->sync_thread) {
6993 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6994 struct bitmap *bitmap;
6995 /* add the bitmap */
6996 if (mddev->bitmap) {
7000 if (mddev->bitmap_info.default_offset == 0) {
7004 mddev->bitmap_info.offset =
7005 mddev->bitmap_info.default_offset;
7006 mddev->bitmap_info.space =
7007 mddev->bitmap_info.default_space;
7008 bitmap = md_bitmap_create(mddev, -1);
7009 mddev_suspend(mddev);
7010 if (!IS_ERR(bitmap)) {
7011 mddev->bitmap = bitmap;
7012 rv = md_bitmap_load(mddev);
7014 rv = PTR_ERR(bitmap);
7016 md_bitmap_destroy(mddev);
7017 mddev_resume(mddev);
7019 /* remove the bitmap */
7020 if (!mddev->bitmap) {
7024 if (mddev->bitmap->storage.file) {
7028 if (mddev->bitmap_info.nodes) {
7029 /* hold PW on all the bitmap lock */
7030 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7031 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7033 md_cluster_ops->unlock_all_bitmaps(mddev);
7037 mddev->bitmap_info.nodes = 0;
7038 md_cluster_ops->leave(mddev);
7040 mddev_suspend(mddev);
7041 md_bitmap_destroy(mddev);
7042 mddev_resume(mddev);
7043 mddev->bitmap_info.offset = 0;
7046 md_update_sb(mddev, 1);
7052 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7054 struct md_rdev *rdev;
7057 if (mddev->pers == NULL)
7061 rdev = md_find_rdev_rcu(mddev, dev);
7065 md_error(mddev, rdev);
7066 if (!test_bit(Faulty, &rdev->flags))
7074 * We have a problem here : there is no easy way to give a CHS
7075 * virtual geometry. We currently pretend that we have a 2 heads
7076 * 4 sectors (with a BIG number of cylinders...). This drives
7077 * dosfs just mad... ;-)
7079 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7081 struct mddev *mddev = bdev->bd_disk->private_data;
7085 geo->cylinders = mddev->array_sectors / 8;
7089 static inline bool md_ioctl_valid(unsigned int cmd)
7094 case GET_ARRAY_INFO:
7095 case GET_BITMAP_FILE:
7098 case HOT_REMOVE_DISK:
7101 case RESTART_ARRAY_RW:
7103 case SET_ARRAY_INFO:
7104 case SET_BITMAP_FILE:
7105 case SET_DISK_FAULTY:
7108 case CLUSTERED_DISK_NACK:
7115 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7116 unsigned int cmd, unsigned long arg)
7119 void __user *argp = (void __user *)arg;
7120 struct mddev *mddev = NULL;
7122 bool did_set_md_closing = false;
7124 if (!md_ioctl_valid(cmd))
7129 case GET_ARRAY_INFO:
7133 if (!capable(CAP_SYS_ADMIN))
7138 * Commands dealing with the RAID driver but not any
7143 err = get_version(argp);
7149 autostart_arrays(arg);
7156 * Commands creating/starting a new array:
7159 mddev = bdev->bd_disk->private_data;
7166 /* Some actions do not requires the mutex */
7168 case GET_ARRAY_INFO:
7169 if (!mddev->raid_disks && !mddev->external)
7172 err = get_array_info(mddev, argp);
7176 if (!mddev->raid_disks && !mddev->external)
7179 err = get_disk_info(mddev, argp);
7182 case SET_DISK_FAULTY:
7183 err = set_disk_faulty(mddev, new_decode_dev(arg));
7186 case GET_BITMAP_FILE:
7187 err = get_bitmap_file(mddev, argp);
7192 if (cmd == ADD_NEW_DISK)
7193 /* need to ensure md_delayed_delete() has completed */
7194 flush_workqueue(md_misc_wq);
7196 if (cmd == HOT_REMOVE_DISK)
7197 /* need to ensure recovery thread has run */
7198 wait_event_interruptible_timeout(mddev->sb_wait,
7199 !test_bit(MD_RECOVERY_NEEDED,
7201 msecs_to_jiffies(5000));
7202 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7203 /* Need to flush page cache, and ensure no-one else opens
7206 mutex_lock(&mddev->open_mutex);
7207 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7208 mutex_unlock(&mddev->open_mutex);
7212 WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
7213 set_bit(MD_CLOSING, &mddev->flags);
7214 did_set_md_closing = true;
7215 mutex_unlock(&mddev->open_mutex);
7216 sync_blockdev(bdev);
7218 err = mddev_lock(mddev);
7220 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7225 if (cmd == SET_ARRAY_INFO) {
7226 mdu_array_info_t info;
7228 memset(&info, 0, sizeof(info));
7229 else if (copy_from_user(&info, argp, sizeof(info))) {
7234 err = update_array_info(mddev, &info);
7236 pr_warn("md: couldn't update array info. %d\n", err);
7241 if (!list_empty(&mddev->disks)) {
7242 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7246 if (mddev->raid_disks) {
7247 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7251 err = set_array_info(mddev, &info);
7253 pr_warn("md: couldn't set array info. %d\n", err);
7260 * Commands querying/configuring an existing array:
7262 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7263 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7264 if ((!mddev->raid_disks && !mddev->external)
7265 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7266 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7267 && cmd != GET_BITMAP_FILE) {
7273 * Commands even a read-only array can execute:
7276 case RESTART_ARRAY_RW:
7277 err = restart_array(mddev);
7281 err = do_md_stop(mddev, 0, bdev);
7285 err = md_set_readonly(mddev, bdev);
7288 case HOT_REMOVE_DISK:
7289 err = hot_remove_disk(mddev, new_decode_dev(arg));
7293 /* We can support ADD_NEW_DISK on read-only arrays
7294 * only if we are re-adding a preexisting device.
7295 * So require mddev->pers and MD_DISK_SYNC.
7298 mdu_disk_info_t info;
7299 if (copy_from_user(&info, argp, sizeof(info)))
7301 else if (!(info.state & (1<<MD_DISK_SYNC)))
7302 /* Need to clear read-only for this */
7305 err = add_new_disk(mddev, &info);
7311 if (get_user(ro, (int __user *)(arg))) {
7317 /* if the bdev is going readonly the value of mddev->ro
7318 * does not matter, no writes are coming
7323 /* are we are already prepared for writes? */
7327 /* transitioning to readauto need only happen for
7328 * arrays that call md_write_start
7331 err = restart_array(mddev);
7334 set_disk_ro(mddev->gendisk, 0);
7341 * The remaining ioctls are changing the state of the
7342 * superblock, so we do not allow them on read-only arrays.
7344 if (mddev->ro && mddev->pers) {
7345 if (mddev->ro == 2) {
7347 sysfs_notify_dirent_safe(mddev->sysfs_state);
7348 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7349 /* mddev_unlock will wake thread */
7350 /* If a device failed while we were read-only, we
7351 * need to make sure the metadata is updated now.
7353 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7354 mddev_unlock(mddev);
7355 wait_event(mddev->sb_wait,
7356 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7357 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7358 mddev_lock_nointr(mddev);
7369 mdu_disk_info_t info;
7370 if (copy_from_user(&info, argp, sizeof(info)))
7373 err = add_new_disk(mddev, &info);
7377 case CLUSTERED_DISK_NACK:
7378 if (mddev_is_clustered(mddev))
7379 md_cluster_ops->new_disk_ack(mddev, false);
7385 err = hot_add_disk(mddev, new_decode_dev(arg));
7389 err = do_md_run(mddev);
7392 case SET_BITMAP_FILE:
7393 err = set_bitmap_file(mddev, (int)arg);
7402 if (mddev->hold_active == UNTIL_IOCTL &&
7404 mddev->hold_active = 0;
7405 mddev_unlock(mddev);
7407 if(did_set_md_closing)
7408 clear_bit(MD_CLOSING, &mddev->flags);
7411 #ifdef CONFIG_COMPAT
7412 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7413 unsigned int cmd, unsigned long arg)
7416 case HOT_REMOVE_DISK:
7418 case SET_DISK_FAULTY:
7419 case SET_BITMAP_FILE:
7420 /* These take in integer arg, do not convert */
7423 arg = (unsigned long)compat_ptr(arg);
7427 return md_ioctl(bdev, mode, cmd, arg);
7429 #endif /* CONFIG_COMPAT */
7431 static int md_open(struct block_device *bdev, fmode_t mode)
7434 * Succeed if we can lock the mddev, which confirms that
7435 * it isn't being stopped right now.
7437 struct mddev *mddev = mddev_find(bdev->bd_dev);
7443 if (mddev->gendisk != bdev->bd_disk) {
7444 /* we are racing with mddev_put which is discarding this
7448 /* Wait until bdev->bd_disk is definitely gone */
7449 flush_workqueue(md_misc_wq);
7450 /* Then retry the open from the top */
7451 return -ERESTARTSYS;
7453 BUG_ON(mddev != bdev->bd_disk->private_data);
7455 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7458 if (test_bit(MD_CLOSING, &mddev->flags)) {
7459 mutex_unlock(&mddev->open_mutex);
7465 atomic_inc(&mddev->openers);
7466 mutex_unlock(&mddev->open_mutex);
7468 check_disk_change(bdev);
7475 static void md_release(struct gendisk *disk, fmode_t mode)
7477 struct mddev *mddev = disk->private_data;
7480 atomic_dec(&mddev->openers);
7484 static int md_media_changed(struct gendisk *disk)
7486 struct mddev *mddev = disk->private_data;
7488 return mddev->changed;
7491 static int md_revalidate(struct gendisk *disk)
7493 struct mddev *mddev = disk->private_data;
7498 static const struct block_device_operations md_fops =
7500 .owner = THIS_MODULE,
7502 .release = md_release,
7504 #ifdef CONFIG_COMPAT
7505 .compat_ioctl = md_compat_ioctl,
7507 .getgeo = md_getgeo,
7508 .media_changed = md_media_changed,
7509 .revalidate_disk= md_revalidate,
7512 static int md_thread(void *arg)
7514 struct md_thread *thread = arg;
7517 * md_thread is a 'system-thread', it's priority should be very
7518 * high. We avoid resource deadlocks individually in each
7519 * raid personality. (RAID5 does preallocation) We also use RR and
7520 * the very same RT priority as kswapd, thus we will never get
7521 * into a priority inversion deadlock.
7523 * we definitely have to have equal or higher priority than
7524 * bdflush, otherwise bdflush will deadlock if there are too
7525 * many dirty RAID5 blocks.
7528 allow_signal(SIGKILL);
7529 while (!kthread_should_stop()) {
7531 /* We need to wait INTERRUPTIBLE so that
7532 * we don't add to the load-average.
7533 * That means we need to be sure no signals are
7536 if (signal_pending(current))
7537 flush_signals(current);
7539 wait_event_interruptible_timeout
7541 test_bit(THREAD_WAKEUP, &thread->flags)
7542 || kthread_should_stop() || kthread_should_park(),
7545 clear_bit(THREAD_WAKEUP, &thread->flags);
7546 if (kthread_should_park())
7548 if (!kthread_should_stop())
7549 thread->run(thread);
7555 void md_wakeup_thread(struct md_thread *thread)
7558 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7559 set_bit(THREAD_WAKEUP, &thread->flags);
7560 wake_up(&thread->wqueue);
7563 EXPORT_SYMBOL(md_wakeup_thread);
7565 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7566 struct mddev *mddev, const char *name)
7568 struct md_thread *thread;
7570 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7574 init_waitqueue_head(&thread->wqueue);
7577 thread->mddev = mddev;
7578 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7579 thread->tsk = kthread_run(md_thread, thread,
7581 mdname(thread->mddev),
7583 if (IS_ERR(thread->tsk)) {
7589 EXPORT_SYMBOL(md_register_thread);
7591 void md_unregister_thread(struct md_thread **threadp)
7593 struct md_thread *thread = *threadp;
7596 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7597 /* Locking ensures that mddev_unlock does not wake_up a
7598 * non-existent thread
7600 spin_lock(&pers_lock);
7602 spin_unlock(&pers_lock);
7604 kthread_stop(thread->tsk);
7607 EXPORT_SYMBOL(md_unregister_thread);
7609 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7611 if (!rdev || test_bit(Faulty, &rdev->flags))
7614 if (!mddev->pers || !mddev->pers->error_handler)
7616 mddev->pers->error_handler(mddev,rdev);
7617 if (mddev->degraded)
7618 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7619 sysfs_notify_dirent_safe(rdev->sysfs_state);
7620 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7621 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7622 md_wakeup_thread(mddev->thread);
7623 if (mddev->event_work.func)
7624 queue_work(md_misc_wq, &mddev->event_work);
7625 md_new_event(mddev);
7627 EXPORT_SYMBOL(md_error);
7629 /* seq_file implementation /proc/mdstat */
7631 static void status_unused(struct seq_file *seq)
7634 struct md_rdev *rdev;
7636 seq_printf(seq, "unused devices: ");
7638 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7639 char b[BDEVNAME_SIZE];
7641 seq_printf(seq, "%s ",
7642 bdevname(rdev->bdev,b));
7645 seq_printf(seq, "<none>");
7647 seq_printf(seq, "\n");
7650 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7652 sector_t max_sectors, resync, res;
7653 unsigned long dt, db;
7656 unsigned int per_milli;
7658 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7659 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7660 max_sectors = mddev->resync_max_sectors;
7662 max_sectors = mddev->dev_sectors;
7664 resync = mddev->curr_resync;
7666 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7667 /* Still cleaning up */
7668 resync = max_sectors;
7669 } else if (resync > max_sectors)
7670 resync = max_sectors;
7672 resync -= atomic_read(&mddev->recovery_active);
7675 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
7676 struct md_rdev *rdev;
7678 rdev_for_each(rdev, mddev)
7679 if (rdev->raid_disk >= 0 &&
7680 !test_bit(Faulty, &rdev->flags) &&
7681 rdev->recovery_offset != MaxSector &&
7682 rdev->recovery_offset) {
7683 seq_printf(seq, "\trecover=REMOTE");
7686 if (mddev->reshape_position != MaxSector)
7687 seq_printf(seq, "\treshape=REMOTE");
7689 seq_printf(seq, "\tresync=REMOTE");
7692 if (mddev->recovery_cp < MaxSector) {
7693 seq_printf(seq, "\tresync=PENDING");
7699 seq_printf(seq, "\tresync=DELAYED");
7703 WARN_ON(max_sectors == 0);
7704 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7705 * in a sector_t, and (max_sectors>>scale) will fit in a
7706 * u32, as those are the requirements for sector_div.
7707 * Thus 'scale' must be at least 10
7710 if (sizeof(sector_t) > sizeof(unsigned long)) {
7711 while ( max_sectors/2 > (1ULL<<(scale+32)))
7714 res = (resync>>scale)*1000;
7715 sector_div(res, (u32)((max_sectors>>scale)+1));
7719 int i, x = per_milli/50, y = 20-x;
7720 seq_printf(seq, "[");
7721 for (i = 0; i < x; i++)
7722 seq_printf(seq, "=");
7723 seq_printf(seq, ">");
7724 for (i = 0; i < y; i++)
7725 seq_printf(seq, ".");
7726 seq_printf(seq, "] ");
7728 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7729 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7731 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7733 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7734 "resync" : "recovery"))),
7735 per_milli/10, per_milli % 10,
7736 (unsigned long long) resync/2,
7737 (unsigned long long) max_sectors/2);
7740 * dt: time from mark until now
7741 * db: blocks written from mark until now
7742 * rt: remaining time
7744 * rt is a sector_t, so could be 32bit or 64bit.
7745 * So we divide before multiply in case it is 32bit and close
7747 * We scale the divisor (db) by 32 to avoid losing precision
7748 * near the end of resync when the number of remaining sectors
7750 * We then divide rt by 32 after multiplying by db to compensate.
7751 * The '+1' avoids division by zero if db is very small.
7753 dt = ((jiffies - mddev->resync_mark) / HZ);
7755 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7756 - mddev->resync_mark_cnt;
7758 rt = max_sectors - resync; /* number of remaining sectors */
7759 sector_div(rt, db/32+1);
7763 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7764 ((unsigned long)rt % 60)/6);
7766 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7770 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7772 struct list_head *tmp;
7774 struct mddev *mddev;
7782 spin_lock(&all_mddevs_lock);
7783 list_for_each(tmp,&all_mddevs)
7785 mddev = list_entry(tmp, struct mddev, all_mddevs);
7787 spin_unlock(&all_mddevs_lock);
7790 spin_unlock(&all_mddevs_lock);
7792 return (void*)2;/* tail */
7796 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7798 struct list_head *tmp;
7799 struct mddev *next_mddev, *mddev = v;
7805 spin_lock(&all_mddevs_lock);
7807 tmp = all_mddevs.next;
7809 tmp = mddev->all_mddevs.next;
7810 if (tmp != &all_mddevs)
7811 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7813 next_mddev = (void*)2;
7816 spin_unlock(&all_mddevs_lock);
7824 static void md_seq_stop(struct seq_file *seq, void *v)
7826 struct mddev *mddev = v;
7828 if (mddev && v != (void*)1 && v != (void*)2)
7832 static int md_seq_show(struct seq_file *seq, void *v)
7834 struct mddev *mddev = v;
7836 struct md_rdev *rdev;
7838 if (v == (void*)1) {
7839 struct md_personality *pers;
7840 seq_printf(seq, "Personalities : ");
7841 spin_lock(&pers_lock);
7842 list_for_each_entry(pers, &pers_list, list)
7843 seq_printf(seq, "[%s] ", pers->name);
7845 spin_unlock(&pers_lock);
7846 seq_printf(seq, "\n");
7847 seq->poll_event = atomic_read(&md_event_count);
7850 if (v == (void*)2) {
7855 spin_lock(&mddev->lock);
7856 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7857 seq_printf(seq, "%s : %sactive", mdname(mddev),
7858 mddev->pers ? "" : "in");
7861 seq_printf(seq, " (read-only)");
7863 seq_printf(seq, " (auto-read-only)");
7864 seq_printf(seq, " %s", mddev->pers->name);
7869 rdev_for_each_rcu(rdev, mddev) {
7870 char b[BDEVNAME_SIZE];
7871 seq_printf(seq, " %s[%d]",
7872 bdevname(rdev->bdev,b), rdev->desc_nr);
7873 if (test_bit(WriteMostly, &rdev->flags))
7874 seq_printf(seq, "(W)");
7875 if (test_bit(Journal, &rdev->flags))
7876 seq_printf(seq, "(J)");
7877 if (test_bit(Faulty, &rdev->flags)) {
7878 seq_printf(seq, "(F)");
7881 if (rdev->raid_disk < 0)
7882 seq_printf(seq, "(S)"); /* spare */
7883 if (test_bit(Replacement, &rdev->flags))
7884 seq_printf(seq, "(R)");
7885 sectors += rdev->sectors;
7889 if (!list_empty(&mddev->disks)) {
7891 seq_printf(seq, "\n %llu blocks",
7892 (unsigned long long)
7893 mddev->array_sectors / 2);
7895 seq_printf(seq, "\n %llu blocks",
7896 (unsigned long long)sectors / 2);
7898 if (mddev->persistent) {
7899 if (mddev->major_version != 0 ||
7900 mddev->minor_version != 90) {
7901 seq_printf(seq," super %d.%d",
7902 mddev->major_version,
7903 mddev->minor_version);
7905 } else if (mddev->external)
7906 seq_printf(seq, " super external:%s",
7907 mddev->metadata_type);
7909 seq_printf(seq, " super non-persistent");
7912 mddev->pers->status(seq, mddev);
7913 seq_printf(seq, "\n ");
7914 if (mddev->pers->sync_request) {
7915 if (status_resync(seq, mddev))
7916 seq_printf(seq, "\n ");
7919 seq_printf(seq, "\n ");
7921 md_bitmap_status(seq, mddev->bitmap);
7923 seq_printf(seq, "\n");
7925 spin_unlock(&mddev->lock);
7930 static const struct seq_operations md_seq_ops = {
7931 .start = md_seq_start,
7932 .next = md_seq_next,
7933 .stop = md_seq_stop,
7934 .show = md_seq_show,
7937 static int md_seq_open(struct inode *inode, struct file *file)
7939 struct seq_file *seq;
7942 error = seq_open(file, &md_seq_ops);
7946 seq = file->private_data;
7947 seq->poll_event = atomic_read(&md_event_count);
7951 static int md_unloading;
7952 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
7954 struct seq_file *seq = filp->private_data;
7958 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
7959 poll_wait(filp, &md_event_waiters, wait);
7961 /* always allow read */
7962 mask = EPOLLIN | EPOLLRDNORM;
7964 if (seq->poll_event != atomic_read(&md_event_count))
7965 mask |= EPOLLERR | EPOLLPRI;
7969 static const struct file_operations md_seq_fops = {
7970 .owner = THIS_MODULE,
7971 .open = md_seq_open,
7973 .llseek = seq_lseek,
7974 .release = seq_release,
7975 .poll = mdstat_poll,
7978 int register_md_personality(struct md_personality *p)
7980 pr_debug("md: %s personality registered for level %d\n",
7982 spin_lock(&pers_lock);
7983 list_add_tail(&p->list, &pers_list);
7984 spin_unlock(&pers_lock);
7987 EXPORT_SYMBOL(register_md_personality);
7989 int unregister_md_personality(struct md_personality *p)
7991 pr_debug("md: %s personality unregistered\n", p->name);
7992 spin_lock(&pers_lock);
7993 list_del_init(&p->list);
7994 spin_unlock(&pers_lock);
7997 EXPORT_SYMBOL(unregister_md_personality);
7999 int register_md_cluster_operations(struct md_cluster_operations *ops,
8000 struct module *module)
8003 spin_lock(&pers_lock);
8004 if (md_cluster_ops != NULL)
8007 md_cluster_ops = ops;
8008 md_cluster_mod = module;
8010 spin_unlock(&pers_lock);
8013 EXPORT_SYMBOL(register_md_cluster_operations);
8015 int unregister_md_cluster_operations(void)
8017 spin_lock(&pers_lock);
8018 md_cluster_ops = NULL;
8019 spin_unlock(&pers_lock);
8022 EXPORT_SYMBOL(unregister_md_cluster_operations);
8024 int md_setup_cluster(struct mddev *mddev, int nodes)
8026 if (!md_cluster_ops)
8027 request_module("md-cluster");
8028 spin_lock(&pers_lock);
8029 /* ensure module won't be unloaded */
8030 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8031 pr_warn("can't find md-cluster module or get it's reference.\n");
8032 spin_unlock(&pers_lock);
8035 spin_unlock(&pers_lock);
8037 return md_cluster_ops->join(mddev, nodes);
8040 void md_cluster_stop(struct mddev *mddev)
8042 if (!md_cluster_ops)
8044 md_cluster_ops->leave(mddev);
8045 module_put(md_cluster_mod);
8048 static int is_mddev_idle(struct mddev *mddev, int init)
8050 struct md_rdev *rdev;
8056 rdev_for_each_rcu(rdev, mddev) {
8057 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8058 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8059 atomic_read(&disk->sync_io);
8060 /* sync IO will cause sync_io to increase before the disk_stats
8061 * as sync_io is counted when a request starts, and
8062 * disk_stats is counted when it completes.
8063 * So resync activity will cause curr_events to be smaller than
8064 * when there was no such activity.
8065 * non-sync IO will cause disk_stat to increase without
8066 * increasing sync_io so curr_events will (eventually)
8067 * be larger than it was before. Once it becomes
8068 * substantially larger, the test below will cause
8069 * the array to appear non-idle, and resync will slow
8071 * If there is a lot of outstanding resync activity when
8072 * we set last_event to curr_events, then all that activity
8073 * completing might cause the array to appear non-idle
8074 * and resync will be slowed down even though there might
8075 * not have been non-resync activity. This will only
8076 * happen once though. 'last_events' will soon reflect
8077 * the state where there is little or no outstanding
8078 * resync requests, and further resync activity will
8079 * always make curr_events less than last_events.
8082 if (init || curr_events - rdev->last_events > 64) {
8083 rdev->last_events = curr_events;
8091 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8093 /* another "blocks" (512byte) blocks have been synced */
8094 atomic_sub(blocks, &mddev->recovery_active);
8095 wake_up(&mddev->recovery_wait);
8097 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8098 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8099 md_wakeup_thread(mddev->thread);
8100 // stop recovery, signal do_sync ....
8103 EXPORT_SYMBOL(md_done_sync);
8105 /* md_write_start(mddev, bi)
8106 * If we need to update some array metadata (e.g. 'active' flag
8107 * in superblock) before writing, schedule a superblock update
8108 * and wait for it to complete.
8109 * A return value of 'false' means that the write wasn't recorded
8110 * and cannot proceed as the array is being suspend.
8112 bool md_write_start(struct mddev *mddev, struct bio *bi)
8116 if (bio_data_dir(bi) != WRITE)
8119 BUG_ON(mddev->ro == 1);
8120 if (mddev->ro == 2) {
8121 /* need to switch to read/write */
8123 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8124 md_wakeup_thread(mddev->thread);
8125 md_wakeup_thread(mddev->sync_thread);
8129 percpu_ref_get(&mddev->writes_pending);
8130 smp_mb(); /* Match smp_mb in set_in_sync() */
8131 if (mddev->safemode == 1)
8132 mddev->safemode = 0;
8133 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8134 if (mddev->in_sync || mddev->sync_checkers) {
8135 spin_lock(&mddev->lock);
8136 if (mddev->in_sync) {
8138 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8139 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8140 md_wakeup_thread(mddev->thread);
8143 spin_unlock(&mddev->lock);
8147 sysfs_notify_dirent_safe(mddev->sysfs_state);
8148 if (!mddev->has_superblocks)
8150 wait_event(mddev->sb_wait,
8151 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8153 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8154 percpu_ref_put(&mddev->writes_pending);
8159 EXPORT_SYMBOL(md_write_start);
8161 /* md_write_inc can only be called when md_write_start() has
8162 * already been called at least once of the current request.
8163 * It increments the counter and is useful when a single request
8164 * is split into several parts. Each part causes an increment and
8165 * so needs a matching md_write_end().
8166 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8167 * a spinlocked region.
8169 void md_write_inc(struct mddev *mddev, struct bio *bi)
8171 if (bio_data_dir(bi) != WRITE)
8173 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8174 percpu_ref_get(&mddev->writes_pending);
8176 EXPORT_SYMBOL(md_write_inc);
8178 void md_write_end(struct mddev *mddev)
8180 percpu_ref_put(&mddev->writes_pending);
8182 if (mddev->safemode == 2)
8183 md_wakeup_thread(mddev->thread);
8184 else if (mddev->safemode_delay)
8185 /* The roundup() ensures this only performs locking once
8186 * every ->safemode_delay jiffies
8188 mod_timer(&mddev->safemode_timer,
8189 roundup(jiffies, mddev->safemode_delay) +
8190 mddev->safemode_delay);
8193 EXPORT_SYMBOL(md_write_end);
8195 /* md_allow_write(mddev)
8196 * Calling this ensures that the array is marked 'active' so that writes
8197 * may proceed without blocking. It is important to call this before
8198 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8199 * Must be called with mddev_lock held.
8201 void md_allow_write(struct mddev *mddev)
8207 if (!mddev->pers->sync_request)
8210 spin_lock(&mddev->lock);
8211 if (mddev->in_sync) {
8213 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8214 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8215 if (mddev->safemode_delay &&
8216 mddev->safemode == 0)
8217 mddev->safemode = 1;
8218 spin_unlock(&mddev->lock);
8219 md_update_sb(mddev, 0);
8220 sysfs_notify_dirent_safe(mddev->sysfs_state);
8221 /* wait for the dirty state to be recorded in the metadata */
8222 wait_event(mddev->sb_wait,
8223 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8225 spin_unlock(&mddev->lock);
8227 EXPORT_SYMBOL_GPL(md_allow_write);
8229 #define SYNC_MARKS 10
8230 #define SYNC_MARK_STEP (3*HZ)
8231 #define UPDATE_FREQUENCY (5*60*HZ)
8232 void md_do_sync(struct md_thread *thread)
8234 struct mddev *mddev = thread->mddev;
8235 struct mddev *mddev2;
8236 unsigned int currspeed = 0,
8238 sector_t max_sectors,j, io_sectors, recovery_done;
8239 unsigned long mark[SYNC_MARKS];
8240 unsigned long update_time;
8241 sector_t mark_cnt[SYNC_MARKS];
8243 struct list_head *tmp;
8244 sector_t last_check;
8246 struct md_rdev *rdev;
8247 char *desc, *action = NULL;
8248 struct blk_plug plug;
8251 /* just incase thread restarts... */
8252 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8253 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8255 if (mddev->ro) {/* never try to sync a read-only array */
8256 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8260 if (mddev_is_clustered(mddev)) {
8261 ret = md_cluster_ops->resync_start(mddev);
8265 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8266 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8267 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8268 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8269 && ((unsigned long long)mddev->curr_resync_completed
8270 < (unsigned long long)mddev->resync_max_sectors))
8274 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8275 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8276 desc = "data-check";
8278 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8279 desc = "requested-resync";
8283 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8288 mddev->last_sync_action = action ?: desc;
8290 /* we overload curr_resync somewhat here.
8291 * 0 == not engaged in resync at all
8292 * 2 == checking that there is no conflict with another sync
8293 * 1 == like 2, but have yielded to allow conflicting resync to
8295 * other == active in resync - this many blocks
8297 * Before starting a resync we must have set curr_resync to
8298 * 2, and then checked that every "conflicting" array has curr_resync
8299 * less than ours. When we find one that is the same or higher
8300 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8301 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8302 * This will mean we have to start checking from the beginning again.
8307 int mddev2_minor = -1;
8308 mddev->curr_resync = 2;
8311 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8313 for_each_mddev(mddev2, tmp) {
8314 if (mddev2 == mddev)
8316 if (!mddev->parallel_resync
8317 && mddev2->curr_resync
8318 && match_mddev_units(mddev, mddev2)) {
8320 if (mddev < mddev2 && mddev->curr_resync == 2) {
8321 /* arbitrarily yield */
8322 mddev->curr_resync = 1;
8323 wake_up(&resync_wait);
8325 if (mddev > mddev2 && mddev->curr_resync == 1)
8326 /* no need to wait here, we can wait the next
8327 * time 'round when curr_resync == 2
8330 /* We need to wait 'interruptible' so as not to
8331 * contribute to the load average, and not to
8332 * be caught by 'softlockup'
8334 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8335 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8336 mddev2->curr_resync >= mddev->curr_resync) {
8337 if (mddev2_minor != mddev2->md_minor) {
8338 mddev2_minor = mddev2->md_minor;
8339 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8340 desc, mdname(mddev),
8344 if (signal_pending(current))
8345 flush_signals(current);
8347 finish_wait(&resync_wait, &wq);
8350 finish_wait(&resync_wait, &wq);
8353 } while (mddev->curr_resync < 2);
8356 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8357 /* resync follows the size requested by the personality,
8358 * which defaults to physical size, but can be virtual size
8360 max_sectors = mddev->resync_max_sectors;
8361 atomic64_set(&mddev->resync_mismatches, 0);
8362 /* we don't use the checkpoint if there's a bitmap */
8363 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8364 j = mddev->resync_min;
8365 else if (!mddev->bitmap)
8366 j = mddev->recovery_cp;
8368 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8369 max_sectors = mddev->resync_max_sectors;
8371 * If the original node aborts reshaping then we continue the
8372 * reshaping, so set j again to avoid restart reshape from the
8375 if (mddev_is_clustered(mddev) &&
8376 mddev->reshape_position != MaxSector)
8377 j = mddev->reshape_position;
8379 /* recovery follows the physical size of devices */
8380 max_sectors = mddev->dev_sectors;
8383 rdev_for_each_rcu(rdev, mddev)
8384 if (rdev->raid_disk >= 0 &&
8385 !test_bit(Journal, &rdev->flags) &&
8386 !test_bit(Faulty, &rdev->flags) &&
8387 !test_bit(In_sync, &rdev->flags) &&
8388 rdev->recovery_offset < j)
8389 j = rdev->recovery_offset;
8392 /* If there is a bitmap, we need to make sure all
8393 * writes that started before we added a spare
8394 * complete before we start doing a recovery.
8395 * Otherwise the write might complete and (via
8396 * bitmap_endwrite) set a bit in the bitmap after the
8397 * recovery has checked that bit and skipped that
8400 if (mddev->bitmap) {
8401 mddev->pers->quiesce(mddev, 1);
8402 mddev->pers->quiesce(mddev, 0);
8406 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8407 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8408 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8409 speed_max(mddev), desc);
8411 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8414 for (m = 0; m < SYNC_MARKS; m++) {
8416 mark_cnt[m] = io_sectors;
8419 mddev->resync_mark = mark[last_mark];
8420 mddev->resync_mark_cnt = mark_cnt[last_mark];
8423 * Tune reconstruction:
8425 window = 32*(PAGE_SIZE/512);
8426 pr_debug("md: using %dk window, over a total of %lluk.\n",
8427 window/2, (unsigned long long)max_sectors/2);
8429 atomic_set(&mddev->recovery_active, 0);
8433 pr_debug("md: resuming %s of %s from checkpoint.\n",
8434 desc, mdname(mddev));
8435 mddev->curr_resync = j;
8437 mddev->curr_resync = 3; /* no longer delayed */
8438 mddev->curr_resync_completed = j;
8439 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8440 md_new_event(mddev);
8441 update_time = jiffies;
8443 blk_start_plug(&plug);
8444 while (j < max_sectors) {
8449 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8450 ((mddev->curr_resync > mddev->curr_resync_completed &&
8451 (mddev->curr_resync - mddev->curr_resync_completed)
8452 > (max_sectors >> 4)) ||
8453 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8454 (j - mddev->curr_resync_completed)*2
8455 >= mddev->resync_max - mddev->curr_resync_completed ||
8456 mddev->curr_resync_completed > mddev->resync_max
8458 /* time to update curr_resync_completed */
8459 wait_event(mddev->recovery_wait,
8460 atomic_read(&mddev->recovery_active) == 0);
8461 mddev->curr_resync_completed = j;
8462 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8463 j > mddev->recovery_cp)
8464 mddev->recovery_cp = j;
8465 update_time = jiffies;
8466 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8467 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8470 while (j >= mddev->resync_max &&
8471 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8472 /* As this condition is controlled by user-space,
8473 * we can block indefinitely, so use '_interruptible'
8474 * to avoid triggering warnings.
8476 flush_signals(current); /* just in case */
8477 wait_event_interruptible(mddev->recovery_wait,
8478 mddev->resync_max > j
8479 || test_bit(MD_RECOVERY_INTR,
8483 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8486 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8488 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8492 if (!skipped) { /* actual IO requested */
8493 io_sectors += sectors;
8494 atomic_add(sectors, &mddev->recovery_active);
8497 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8501 if (j > max_sectors)
8502 /* when skipping, extra large numbers can be returned. */
8505 mddev->curr_resync = j;
8506 mddev->curr_mark_cnt = io_sectors;
8507 if (last_check == 0)
8508 /* this is the earliest that rebuild will be
8509 * visible in /proc/mdstat
8511 md_new_event(mddev);
8513 if (last_check + window > io_sectors || j == max_sectors)
8516 last_check = io_sectors;
8518 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8520 int next = (last_mark+1) % SYNC_MARKS;
8522 mddev->resync_mark = mark[next];
8523 mddev->resync_mark_cnt = mark_cnt[next];
8524 mark[next] = jiffies;
8525 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8529 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8533 * this loop exits only if either when we are slower than
8534 * the 'hard' speed limit, or the system was IO-idle for
8536 * the system might be non-idle CPU-wise, but we only care
8537 * about not overloading the IO subsystem. (things like an
8538 * e2fsck being done on the RAID array should execute fast)
8542 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8543 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8544 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8546 if (currspeed > speed_min(mddev)) {
8547 if (currspeed > speed_max(mddev)) {
8551 if (!is_mddev_idle(mddev, 0)) {
8553 * Give other IO more of a chance.
8554 * The faster the devices, the less we wait.
8556 wait_event(mddev->recovery_wait,
8557 !atomic_read(&mddev->recovery_active));
8561 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8562 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8563 ? "interrupted" : "done");
8565 * this also signals 'finished resyncing' to md_stop
8567 blk_finish_plug(&plug);
8568 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8570 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8571 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8572 mddev->curr_resync > 3) {
8573 mddev->curr_resync_completed = mddev->curr_resync;
8574 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8576 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8578 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8579 mddev->curr_resync > 3) {
8580 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8581 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8582 if (mddev->curr_resync >= mddev->recovery_cp) {
8583 pr_debug("md: checkpointing %s of %s.\n",
8584 desc, mdname(mddev));
8585 if (test_bit(MD_RECOVERY_ERROR,
8587 mddev->recovery_cp =
8588 mddev->curr_resync_completed;
8590 mddev->recovery_cp =
8594 mddev->recovery_cp = MaxSector;
8596 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8597 mddev->curr_resync = MaxSector;
8598 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8599 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
8601 rdev_for_each_rcu(rdev, mddev)
8602 if (rdev->raid_disk >= 0 &&
8603 mddev->delta_disks >= 0 &&
8604 !test_bit(Journal, &rdev->flags) &&
8605 !test_bit(Faulty, &rdev->flags) &&
8606 !test_bit(In_sync, &rdev->flags) &&
8607 rdev->recovery_offset < mddev->curr_resync)
8608 rdev->recovery_offset = mddev->curr_resync;
8614 /* set CHANGE_PENDING here since maybe another update is needed,
8615 * so other nodes are informed. It should be harmless for normal
8617 set_mask_bits(&mddev->sb_flags, 0,
8618 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8620 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8621 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8622 mddev->delta_disks > 0 &&
8623 mddev->pers->finish_reshape &&
8624 mddev->pers->size &&
8626 mddev_lock_nointr(mddev);
8627 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8628 mddev_unlock(mddev);
8629 if (!mddev_is_clustered(mddev)) {
8630 set_capacity(mddev->gendisk, mddev->array_sectors);
8631 revalidate_disk(mddev->gendisk);
8635 spin_lock(&mddev->lock);
8636 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8637 /* We completed so min/max setting can be forgotten if used. */
8638 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8639 mddev->resync_min = 0;
8640 mddev->resync_max = MaxSector;
8641 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8642 mddev->resync_min = mddev->curr_resync_completed;
8643 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8644 mddev->curr_resync = 0;
8645 spin_unlock(&mddev->lock);
8647 wake_up(&resync_wait);
8648 md_wakeup_thread(mddev->thread);
8651 EXPORT_SYMBOL_GPL(md_do_sync);
8653 static int remove_and_add_spares(struct mddev *mddev,
8654 struct md_rdev *this)
8656 struct md_rdev *rdev;
8659 bool remove_some = false;
8661 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8662 /* Mustn't remove devices when resync thread is running */
8665 rdev_for_each(rdev, mddev) {
8666 if ((this == NULL || rdev == this) &&
8667 rdev->raid_disk >= 0 &&
8668 !test_bit(Blocked, &rdev->flags) &&
8669 test_bit(Faulty, &rdev->flags) &&
8670 atomic_read(&rdev->nr_pending)==0) {
8671 /* Faulty non-Blocked devices with nr_pending == 0
8672 * never get nr_pending incremented,
8673 * never get Faulty cleared, and never get Blocked set.
8674 * So we can synchronize_rcu now rather than once per device
8677 set_bit(RemoveSynchronized, &rdev->flags);
8683 rdev_for_each(rdev, mddev) {
8684 if ((this == NULL || rdev == this) &&
8685 rdev->raid_disk >= 0 &&
8686 !test_bit(Blocked, &rdev->flags) &&
8687 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8688 (!test_bit(In_sync, &rdev->flags) &&
8689 !test_bit(Journal, &rdev->flags))) &&
8690 atomic_read(&rdev->nr_pending)==0)) {
8691 if (mddev->pers->hot_remove_disk(
8692 mddev, rdev) == 0) {
8693 sysfs_unlink_rdev(mddev, rdev);
8694 rdev->saved_raid_disk = rdev->raid_disk;
8695 rdev->raid_disk = -1;
8699 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8700 clear_bit(RemoveSynchronized, &rdev->flags);
8703 if (removed && mddev->kobj.sd)
8704 sysfs_notify(&mddev->kobj, NULL, "degraded");
8706 if (this && removed)
8709 rdev_for_each(rdev, mddev) {
8710 if (this && this != rdev)
8712 if (test_bit(Candidate, &rdev->flags))
8714 if (rdev->raid_disk >= 0 &&
8715 !test_bit(In_sync, &rdev->flags) &&
8716 !test_bit(Journal, &rdev->flags) &&
8717 !test_bit(Faulty, &rdev->flags))
8719 if (rdev->raid_disk >= 0)
8721 if (test_bit(Faulty, &rdev->flags))
8723 if (!test_bit(Journal, &rdev->flags)) {
8725 ! (rdev->saved_raid_disk >= 0 &&
8726 !test_bit(Bitmap_sync, &rdev->flags)))
8729 rdev->recovery_offset = 0;
8732 hot_add_disk(mddev, rdev) == 0) {
8733 if (sysfs_link_rdev(mddev, rdev))
8734 /* failure here is OK */;
8735 if (!test_bit(Journal, &rdev->flags))
8737 md_new_event(mddev);
8738 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8743 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8747 static void md_start_sync(struct work_struct *ws)
8749 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8751 mddev->sync_thread = md_register_thread(md_do_sync,
8754 if (!mddev->sync_thread) {
8755 pr_warn("%s: could not start resync thread...\n",
8757 /* leave the spares where they are, it shouldn't hurt */
8758 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8759 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8760 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8761 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8762 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8763 wake_up(&resync_wait);
8764 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8766 if (mddev->sysfs_action)
8767 sysfs_notify_dirent_safe(mddev->sysfs_action);
8769 md_wakeup_thread(mddev->sync_thread);
8770 sysfs_notify_dirent_safe(mddev->sysfs_action);
8771 md_new_event(mddev);
8775 * This routine is regularly called by all per-raid-array threads to
8776 * deal with generic issues like resync and super-block update.
8777 * Raid personalities that don't have a thread (linear/raid0) do not
8778 * need this as they never do any recovery or update the superblock.
8780 * It does not do any resync itself, but rather "forks" off other threads
8781 * to do that as needed.
8782 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8783 * "->recovery" and create a thread at ->sync_thread.
8784 * When the thread finishes it sets MD_RECOVERY_DONE
8785 * and wakeups up this thread which will reap the thread and finish up.
8786 * This thread also removes any faulty devices (with nr_pending == 0).
8788 * The overall approach is:
8789 * 1/ if the superblock needs updating, update it.
8790 * 2/ If a recovery thread is running, don't do anything else.
8791 * 3/ If recovery has finished, clean up, possibly marking spares active.
8792 * 4/ If there are any faulty devices, remove them.
8793 * 5/ If array is degraded, try to add spares devices
8794 * 6/ If array has spares or is not in-sync, start a resync thread.
8796 void md_check_recovery(struct mddev *mddev)
8798 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
8799 /* Write superblock - thread that called mddev_suspend()
8800 * holds reconfig_mutex for us.
8802 set_bit(MD_UPDATING_SB, &mddev->flags);
8803 smp_mb__after_atomic();
8804 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
8805 md_update_sb(mddev, 0);
8806 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
8807 wake_up(&mddev->sb_wait);
8810 if (mddev->suspended)
8814 md_bitmap_daemon_work(mddev);
8816 if (signal_pending(current)) {
8817 if (mddev->pers->sync_request && !mddev->external) {
8818 pr_debug("md: %s in immediate safe mode\n",
8820 mddev->safemode = 2;
8822 flush_signals(current);
8825 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8828 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
8829 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8830 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8831 (mddev->external == 0 && mddev->safemode == 1) ||
8832 (mddev->safemode == 2
8833 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8837 if (mddev_trylock(mddev)) {
8840 if (!mddev->external && mddev->safemode == 1)
8841 mddev->safemode = 0;
8844 struct md_rdev *rdev;
8845 if (!mddev->external && mddev->in_sync)
8846 /* 'Blocked' flag not needed as failed devices
8847 * will be recorded if array switched to read/write.
8848 * Leaving it set will prevent the device
8849 * from being removed.
8851 rdev_for_each(rdev, mddev)
8852 clear_bit(Blocked, &rdev->flags);
8853 /* On a read-only array we can:
8854 * - remove failed devices
8855 * - add already-in_sync devices if the array itself
8857 * As we only add devices that are already in-sync,
8858 * we can activate the spares immediately.
8860 remove_and_add_spares(mddev, NULL);
8861 /* There is no thread, but we need to call
8862 * ->spare_active and clear saved_raid_disk
8864 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8865 md_reap_sync_thread(mddev);
8866 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8867 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8868 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8872 if (mddev_is_clustered(mddev)) {
8873 struct md_rdev *rdev;
8874 /* kick the device if another node issued a
8877 rdev_for_each(rdev, mddev) {
8878 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8879 rdev->raid_disk < 0)
8880 md_kick_rdev_from_array(rdev);
8884 if (!mddev->external && !mddev->in_sync) {
8885 spin_lock(&mddev->lock);
8887 spin_unlock(&mddev->lock);
8890 if (mddev->sb_flags)
8891 md_update_sb(mddev, 0);
8893 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8894 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8895 /* resync/recovery still happening */
8896 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8899 if (mddev->sync_thread) {
8900 md_reap_sync_thread(mddev);
8903 /* Set RUNNING before clearing NEEDED to avoid
8904 * any transients in the value of "sync_action".
8906 mddev->curr_resync_completed = 0;
8907 spin_lock(&mddev->lock);
8908 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8909 spin_unlock(&mddev->lock);
8910 /* Clear some bits that don't mean anything, but
8913 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8914 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8916 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8917 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8919 /* no recovery is running.
8920 * remove any failed drives, then
8921 * add spares if possible.
8922 * Spares are also removed and re-added, to allow
8923 * the personality to fail the re-add.
8926 if (mddev->reshape_position != MaxSector) {
8927 if (mddev->pers->check_reshape == NULL ||
8928 mddev->pers->check_reshape(mddev) != 0)
8929 /* Cannot proceed */
8931 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8932 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8933 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8934 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8935 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8936 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8937 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8938 } else if (mddev->recovery_cp < MaxSector) {
8939 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8940 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8941 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8942 /* nothing to be done ... */
8945 if (mddev->pers->sync_request) {
8947 /* We are adding a device or devices to an array
8948 * which has the bitmap stored on all devices.
8949 * So make sure all bitmap pages get written
8951 md_bitmap_write_all(mddev->bitmap);
8953 INIT_WORK(&mddev->del_work, md_start_sync);
8954 queue_work(md_misc_wq, &mddev->del_work);
8958 if (!mddev->sync_thread) {
8959 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8960 wake_up(&resync_wait);
8961 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8963 if (mddev->sysfs_action)
8964 sysfs_notify_dirent_safe(mddev->sysfs_action);
8967 wake_up(&mddev->sb_wait);
8968 mddev_unlock(mddev);
8971 EXPORT_SYMBOL(md_check_recovery);
8973 void md_reap_sync_thread(struct mddev *mddev)
8975 struct md_rdev *rdev;
8976 sector_t old_dev_sectors = mddev->dev_sectors;
8977 bool is_reshaped = false;
8979 /* resync has finished, collect result */
8980 md_unregister_thread(&mddev->sync_thread);
8981 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8982 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8984 /* activate any spares */
8985 if (mddev->pers->spare_active(mddev)) {
8986 sysfs_notify(&mddev->kobj, NULL,
8988 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8991 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8992 mddev->pers->finish_reshape) {
8993 mddev->pers->finish_reshape(mddev);
8994 if (mddev_is_clustered(mddev))
8998 /* If array is no-longer degraded, then any saved_raid_disk
8999 * information must be scrapped.
9001 if (!mddev->degraded)
9002 rdev_for_each(rdev, mddev)
9003 rdev->saved_raid_disk = -1;
9005 md_update_sb(mddev, 1);
9006 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9007 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9009 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9010 md_cluster_ops->resync_finish(mddev);
9011 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9012 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9013 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9014 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9015 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9016 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9018 * We call md_cluster_ops->update_size here because sync_size could
9019 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9020 * so it is time to update size across cluster.
9022 if (mddev_is_clustered(mddev) && is_reshaped
9023 && !test_bit(MD_CLOSING, &mddev->flags))
9024 md_cluster_ops->update_size(mddev, old_dev_sectors);
9025 wake_up(&resync_wait);
9026 /* flag recovery needed just to double check */
9027 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9028 sysfs_notify_dirent_safe(mddev->sysfs_action);
9029 md_new_event(mddev);
9030 if (mddev->event_work.func)
9031 queue_work(md_misc_wq, &mddev->event_work);
9033 EXPORT_SYMBOL(md_reap_sync_thread);
9035 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9037 sysfs_notify_dirent_safe(rdev->sysfs_state);
9038 wait_event_timeout(rdev->blocked_wait,
9039 !test_bit(Blocked, &rdev->flags) &&
9040 !test_bit(BlockedBadBlocks, &rdev->flags),
9041 msecs_to_jiffies(5000));
9042 rdev_dec_pending(rdev, mddev);
9044 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9046 void md_finish_reshape(struct mddev *mddev)
9048 /* called be personality module when reshape completes. */
9049 struct md_rdev *rdev;
9051 rdev_for_each(rdev, mddev) {
9052 if (rdev->data_offset > rdev->new_data_offset)
9053 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9055 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9056 rdev->data_offset = rdev->new_data_offset;
9059 EXPORT_SYMBOL(md_finish_reshape);
9061 /* Bad block management */
9063 /* Returns 1 on success, 0 on failure */
9064 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9067 struct mddev *mddev = rdev->mddev;
9070 s += rdev->new_data_offset;
9072 s += rdev->data_offset;
9073 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9075 /* Make sure they get written out promptly */
9076 if (test_bit(ExternalBbl, &rdev->flags))
9077 sysfs_notify(&rdev->kobj, NULL,
9078 "unacknowledged_bad_blocks");
9079 sysfs_notify_dirent_safe(rdev->sysfs_state);
9080 set_mask_bits(&mddev->sb_flags, 0,
9081 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9082 md_wakeup_thread(rdev->mddev->thread);
9087 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9089 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9094 s += rdev->new_data_offset;
9096 s += rdev->data_offset;
9097 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9098 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9099 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9102 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9104 static int md_notify_reboot(struct notifier_block *this,
9105 unsigned long code, void *x)
9107 struct list_head *tmp;
9108 struct mddev *mddev;
9111 for_each_mddev(mddev, tmp) {
9112 if (mddev_trylock(mddev)) {
9114 __md_stop_writes(mddev);
9115 if (mddev->persistent)
9116 mddev->safemode = 2;
9117 mddev_unlock(mddev);
9122 * certain more exotic SCSI devices are known to be
9123 * volatile wrt too early system reboots. While the
9124 * right place to handle this issue is the given
9125 * driver, we do want to have a safe RAID driver ...
9133 static struct notifier_block md_notifier = {
9134 .notifier_call = md_notify_reboot,
9136 .priority = INT_MAX, /* before any real devices */
9139 static void md_geninit(void)
9141 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9143 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9146 static int __init md_init(void)
9150 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9154 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9158 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9161 if ((ret = register_blkdev(0, "mdp")) < 0)
9165 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9166 md_probe, NULL, NULL);
9167 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9168 md_probe, NULL, NULL);
9170 register_reboot_notifier(&md_notifier);
9171 raid_table_header = register_sysctl_table(raid_root_table);
9177 unregister_blkdev(MD_MAJOR, "md");
9179 destroy_workqueue(md_misc_wq);
9181 destroy_workqueue(md_wq);
9186 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9188 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9189 struct md_rdev *rdev2;
9191 char b[BDEVNAME_SIZE];
9194 * If size is changed in another node then we need to
9195 * do resize as well.
9197 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9198 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9200 pr_info("md-cluster: resize failed\n");
9202 md_bitmap_update_sb(mddev->bitmap);
9205 /* Check for change of roles in the active devices */
9206 rdev_for_each(rdev2, mddev) {
9207 if (test_bit(Faulty, &rdev2->flags))
9210 /* Check if the roles changed */
9211 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9213 if (test_bit(Candidate, &rdev2->flags)) {
9214 if (role == 0xfffe) {
9215 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9216 md_kick_rdev_from_array(rdev2);
9220 clear_bit(Candidate, &rdev2->flags);
9223 if (role != rdev2->raid_disk) {
9225 * got activated except reshape is happening.
9227 if (rdev2->raid_disk == -1 && role != 0xffff &&
9228 !(le32_to_cpu(sb->feature_map) &
9229 MD_FEATURE_RESHAPE_ACTIVE)) {
9230 rdev2->saved_raid_disk = role;
9231 ret = remove_and_add_spares(mddev, rdev2);
9232 pr_info("Activated spare: %s\n",
9233 bdevname(rdev2->bdev,b));
9234 /* wakeup mddev->thread here, so array could
9235 * perform resync with the new activated disk */
9236 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9237 md_wakeup_thread(mddev->thread);
9241 * We just want to do the minimum to mark the disk
9242 * as faulty. The recovery is performed by the
9243 * one who initiated the error.
9245 if ((role == 0xfffe) || (role == 0xfffd)) {
9246 md_error(mddev, rdev2);
9247 clear_bit(Blocked, &rdev2->flags);
9252 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9253 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9256 * Since mddev->delta_disks has already updated in update_raid_disks,
9257 * so it is time to check reshape.
9259 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9260 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9262 * reshape is happening in the remote node, we need to
9263 * update reshape_position and call start_reshape.
9265 mddev->reshape_position = sb->reshape_position;
9266 if (mddev->pers->update_reshape_pos)
9267 mddev->pers->update_reshape_pos(mddev);
9268 if (mddev->pers->start_reshape)
9269 mddev->pers->start_reshape(mddev);
9270 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9271 mddev->reshape_position != MaxSector &&
9272 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9273 /* reshape is just done in another node. */
9274 mddev->reshape_position = MaxSector;
9275 if (mddev->pers->update_reshape_pos)
9276 mddev->pers->update_reshape_pos(mddev);
9279 /* Finally set the event to be up to date */
9280 mddev->events = le64_to_cpu(sb->events);
9283 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9286 struct page *swapout = rdev->sb_page;
9287 struct mdp_superblock_1 *sb;
9289 /* Store the sb page of the rdev in the swapout temporary
9290 * variable in case we err in the future
9292 rdev->sb_page = NULL;
9293 err = alloc_disk_sb(rdev);
9295 ClearPageUptodate(rdev->sb_page);
9296 rdev->sb_loaded = 0;
9297 err = super_types[mddev->major_version].
9298 load_super(rdev, NULL, mddev->minor_version);
9301 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9302 __func__, __LINE__, rdev->desc_nr, err);
9304 put_page(rdev->sb_page);
9305 rdev->sb_page = swapout;
9306 rdev->sb_loaded = 1;
9310 sb = page_address(rdev->sb_page);
9311 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9315 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9316 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9318 /* The other node finished recovery, call spare_active to set
9319 * device In_sync and mddev->degraded
9321 if (rdev->recovery_offset == MaxSector &&
9322 !test_bit(In_sync, &rdev->flags) &&
9323 mddev->pers->spare_active(mddev))
9324 sysfs_notify(&mddev->kobj, NULL, "degraded");
9330 void md_reload_sb(struct mddev *mddev, int nr)
9332 struct md_rdev *rdev;
9336 rdev_for_each_rcu(rdev, mddev) {
9337 if (rdev->desc_nr == nr)
9341 if (!rdev || rdev->desc_nr != nr) {
9342 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9346 err = read_rdev(mddev, rdev);
9350 check_sb_changes(mddev, rdev);
9352 /* Read all rdev's to update recovery_offset */
9353 rdev_for_each_rcu(rdev, mddev) {
9354 if (!test_bit(Faulty, &rdev->flags))
9355 read_rdev(mddev, rdev);
9358 EXPORT_SYMBOL(md_reload_sb);
9363 * Searches all registered partitions for autorun RAID arrays
9367 static DEFINE_MUTEX(detected_devices_mutex);
9368 static LIST_HEAD(all_detected_devices);
9369 struct detected_devices_node {
9370 struct list_head list;
9374 void md_autodetect_dev(dev_t dev)
9376 struct detected_devices_node *node_detected_dev;
9378 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9379 if (node_detected_dev) {
9380 node_detected_dev->dev = dev;
9381 mutex_lock(&detected_devices_mutex);
9382 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9383 mutex_unlock(&detected_devices_mutex);
9387 static void autostart_arrays(int part)
9389 struct md_rdev *rdev;
9390 struct detected_devices_node *node_detected_dev;
9392 int i_scanned, i_passed;
9397 pr_info("md: Autodetecting RAID arrays.\n");
9399 mutex_lock(&detected_devices_mutex);
9400 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9402 node_detected_dev = list_entry(all_detected_devices.next,
9403 struct detected_devices_node, list);
9404 list_del(&node_detected_dev->list);
9405 dev = node_detected_dev->dev;
9406 kfree(node_detected_dev);
9407 mutex_unlock(&detected_devices_mutex);
9408 rdev = md_import_device(dev,0, 90);
9409 mutex_lock(&detected_devices_mutex);
9413 if (test_bit(Faulty, &rdev->flags))
9416 set_bit(AutoDetected, &rdev->flags);
9417 list_add(&rdev->same_set, &pending_raid_disks);
9420 mutex_unlock(&detected_devices_mutex);
9422 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9424 autorun_devices(part);
9427 #endif /* !MODULE */
9429 static __exit void md_exit(void)
9431 struct mddev *mddev;
9432 struct list_head *tmp;
9435 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9436 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9438 unregister_blkdev(MD_MAJOR,"md");
9439 unregister_blkdev(mdp_major, "mdp");
9440 unregister_reboot_notifier(&md_notifier);
9441 unregister_sysctl_table(raid_table_header);
9443 /* We cannot unload the modules while some process is
9444 * waiting for us in select() or poll() - wake them up
9447 while (waitqueue_active(&md_event_waiters)) {
9448 /* not safe to leave yet */
9449 wake_up(&md_event_waiters);
9453 remove_proc_entry("mdstat", NULL);
9455 for_each_mddev(mddev, tmp) {
9456 export_array(mddev);
9458 mddev->hold_active = 0;
9460 * for_each_mddev() will call mddev_put() at the end of each
9461 * iteration. As the mddev is now fully clear, this will
9462 * schedule the mddev for destruction by a workqueue, and the
9463 * destroy_workqueue() below will wait for that to complete.
9466 destroy_workqueue(md_misc_wq);
9467 destroy_workqueue(md_wq);
9470 subsys_initcall(md_init);
9471 module_exit(md_exit)
9473 static int get_ro(char *buffer, const struct kernel_param *kp)
9475 return sprintf(buffer, "%d", start_readonly);
9477 static int set_ro(const char *val, const struct kernel_param *kp)
9479 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9482 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9483 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9484 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9485 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9487 MODULE_LICENSE("GPL");
9488 MODULE_DESCRIPTION("MD RAID framework");
9490 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);