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/kthread.h>
48 #include <linux/blkdev.h>
49 #include <linux/badblocks.h>
50 #include <linux/sysctl.h>
51 #include <linux/seq_file.h>
53 #include <linux/poll.h>
54 #include <linux/ctype.h>
55 #include <linux/string.h>
56 #include <linux/hdreg.h>
57 #include <linux/proc_fs.h>
58 #include <linux/random.h>
59 #include <linux/module.h>
60 #include <linux/reboot.h>
61 #include <linux/file.h>
62 #include <linux/compat.h>
63 #include <linux/delay.h>
64 #include <linux/raid/md_p.h>
65 #include <linux/raid/md_u.h>
66 #include <linux/slab.h>
67 #include <trace/events/block.h>
70 #include "md-cluster.h"
73 static void autostart_arrays(int part);
76 /* pers_list is a list of registered personalities protected
78 * pers_lock does extra service to protect accesses to
79 * mddev->thread when the mutex cannot be held.
81 static LIST_HEAD(pers_list);
82 static DEFINE_SPINLOCK(pers_lock);
84 struct md_cluster_operations *md_cluster_ops;
85 EXPORT_SYMBOL(md_cluster_ops);
86 struct module *md_cluster_mod;
87 EXPORT_SYMBOL(md_cluster_mod);
89 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
90 static struct workqueue_struct *md_wq;
91 static struct workqueue_struct *md_misc_wq;
93 static int remove_and_add_spares(struct mddev *mddev,
94 struct md_rdev *this);
95 static void mddev_detach(struct mddev *mddev);
98 * Default number of read corrections we'll attempt on an rdev
99 * before ejecting it from the array. We divide the read error
100 * count by 2 for every hour elapsed between read errors.
102 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
104 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
105 * is 1000 KB/sec, so the extra system load does not show up that much.
106 * Increase it if you want to have more _guaranteed_ speed. Note that
107 * the RAID driver will use the maximum available bandwidth if the IO
108 * subsystem is idle. There is also an 'absolute maximum' reconstruction
109 * speed limit - in case reconstruction slows down your system despite
112 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
113 * or /sys/block/mdX/md/sync_speed_{min,max}
116 static int sysctl_speed_limit_min = 1000;
117 static int sysctl_speed_limit_max = 200000;
118 static inline int speed_min(struct mddev *mddev)
120 return mddev->sync_speed_min ?
121 mddev->sync_speed_min : sysctl_speed_limit_min;
124 static inline int speed_max(struct mddev *mddev)
126 return mddev->sync_speed_max ?
127 mddev->sync_speed_max : sysctl_speed_limit_max;
130 static struct ctl_table_header *raid_table_header;
132 static struct ctl_table raid_table[] = {
134 .procname = "speed_limit_min",
135 .data = &sysctl_speed_limit_min,
136 .maxlen = sizeof(int),
137 .mode = S_IRUGO|S_IWUSR,
138 .proc_handler = proc_dointvec,
141 .procname = "speed_limit_max",
142 .data = &sysctl_speed_limit_max,
143 .maxlen = sizeof(int),
144 .mode = S_IRUGO|S_IWUSR,
145 .proc_handler = proc_dointvec,
150 static struct ctl_table raid_dir_table[] = {
154 .mode = S_IRUGO|S_IXUGO,
160 static struct ctl_table raid_root_table[] = {
165 .child = raid_dir_table,
170 static const struct block_device_operations md_fops;
172 static int start_readonly;
175 * like bio_clone, but with a local bio set
178 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
183 if (!mddev || !mddev->bio_set)
184 return bio_alloc(gfp_mask, nr_iovecs);
186 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
191 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
193 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
196 if (!mddev || !mddev->bio_set)
197 return bio_clone(bio, gfp_mask);
199 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
201 EXPORT_SYMBOL_GPL(bio_clone_mddev);
204 * We have a system wide 'event count' that is incremented
205 * on any 'interesting' event, and readers of /proc/mdstat
206 * can use 'poll' or 'select' to find out when the event
210 * start array, stop array, error, add device, remove device,
211 * start build, activate spare
213 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
214 static atomic_t md_event_count;
215 void md_new_event(struct mddev *mddev)
217 atomic_inc(&md_event_count);
218 wake_up(&md_event_waiters);
220 EXPORT_SYMBOL_GPL(md_new_event);
223 * Enables to iterate over all existing md arrays
224 * all_mddevs_lock protects this list.
226 static LIST_HEAD(all_mddevs);
227 static DEFINE_SPINLOCK(all_mddevs_lock);
230 * iterates through all used mddevs in the system.
231 * We take care to grab the all_mddevs_lock whenever navigating
232 * the list, and to always hold a refcount when unlocked.
233 * Any code which breaks out of this loop while own
234 * a reference to the current mddev and must mddev_put it.
236 #define for_each_mddev(_mddev,_tmp) \
238 for (({ spin_lock(&all_mddevs_lock); \
239 _tmp = all_mddevs.next; \
241 ({ if (_tmp != &all_mddevs) \
242 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
243 spin_unlock(&all_mddevs_lock); \
244 if (_mddev) mddev_put(_mddev); \
245 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
246 _tmp != &all_mddevs;}); \
247 ({ spin_lock(&all_mddevs_lock); \
248 _tmp = _tmp->next;}) \
251 /* Rather than calling directly into the personality make_request function,
252 * IO requests come here first so that we can check if the device is
253 * being suspended pending a reconfiguration.
254 * We hold a refcount over the call to ->make_request. By the time that
255 * call has finished, the bio has been linked into some internal structure
256 * and so is visible to ->quiesce(), so we don't need the refcount any more.
258 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
260 const int rw = bio_data_dir(bio);
261 struct mddev *mddev = q->queuedata;
262 unsigned int sectors;
265 blk_queue_split(q, &bio, q->bio_split);
267 if (mddev == NULL || mddev->pers == NULL) {
269 return BLK_QC_T_NONE;
271 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
272 if (bio_sectors(bio) != 0)
273 bio->bi_error = -EROFS;
275 return BLK_QC_T_NONE;
277 smp_rmb(); /* Ensure implications of 'active' are visible */
279 if (mddev->suspended) {
282 prepare_to_wait(&mddev->sb_wait, &__wait,
283 TASK_UNINTERRUPTIBLE);
284 if (!mddev->suspended)
290 finish_wait(&mddev->sb_wait, &__wait);
292 atomic_inc(&mddev->active_io);
296 * save the sectors now since our bio can
297 * go away inside make_request
299 sectors = bio_sectors(bio);
300 /* bio could be mergeable after passing to underlayer */
301 bio->bi_opf &= ~REQ_NOMERGE;
302 mddev->pers->make_request(mddev, bio);
304 cpu = part_stat_lock();
305 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
306 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
309 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
310 wake_up(&mddev->sb_wait);
312 return BLK_QC_T_NONE;
315 /* mddev_suspend makes sure no new requests are submitted
316 * to the device, and that any requests that have been submitted
317 * are completely handled.
318 * Once mddev_detach() is called and completes, the module will be
321 void mddev_suspend(struct mddev *mddev)
323 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
324 if (mddev->suspended++)
327 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
328 mddev->pers->quiesce(mddev, 1);
330 del_timer_sync(&mddev->safemode_timer);
332 EXPORT_SYMBOL_GPL(mddev_suspend);
334 void mddev_resume(struct mddev *mddev)
336 if (--mddev->suspended)
338 wake_up(&mddev->sb_wait);
339 mddev->pers->quiesce(mddev, 0);
341 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
342 md_wakeup_thread(mddev->thread);
343 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
345 EXPORT_SYMBOL_GPL(mddev_resume);
347 int mddev_congested(struct mddev *mddev, int bits)
349 struct md_personality *pers = mddev->pers;
353 if (mddev->suspended)
355 else if (pers && pers->congested)
356 ret = pers->congested(mddev, bits);
360 EXPORT_SYMBOL_GPL(mddev_congested);
361 static int md_congested(void *data, int bits)
363 struct mddev *mddev = data;
364 return mddev_congested(mddev, bits);
368 * Generic flush handling for md
371 static void md_end_flush(struct bio *bio)
373 struct md_rdev *rdev = bio->bi_private;
374 struct mddev *mddev = rdev->mddev;
376 rdev_dec_pending(rdev, mddev);
378 if (atomic_dec_and_test(&mddev->flush_pending)) {
379 /* The pre-request flush has finished */
380 queue_work(md_wq, &mddev->flush_work);
385 static void md_submit_flush_data(struct work_struct *ws);
387 static void submit_flushes(struct work_struct *ws)
389 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
390 struct md_rdev *rdev;
392 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
393 atomic_set(&mddev->flush_pending, 1);
395 rdev_for_each_rcu(rdev, mddev)
396 if (rdev->raid_disk >= 0 &&
397 !test_bit(Faulty, &rdev->flags)) {
398 /* Take two references, one is dropped
399 * when request finishes, one after
400 * we reclaim rcu_read_lock
403 atomic_inc(&rdev->nr_pending);
404 atomic_inc(&rdev->nr_pending);
406 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
407 bi->bi_end_io = md_end_flush;
408 bi->bi_private = rdev;
409 bi->bi_bdev = rdev->bdev;
410 bio_set_op_attrs(bi, REQ_OP_WRITE, WRITE_FLUSH);
411 atomic_inc(&mddev->flush_pending);
414 rdev_dec_pending(rdev, mddev);
417 if (atomic_dec_and_test(&mddev->flush_pending))
418 queue_work(md_wq, &mddev->flush_work);
421 static void md_submit_flush_data(struct work_struct *ws)
423 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
424 struct bio *bio = mddev->flush_bio;
426 if (bio->bi_iter.bi_size == 0)
427 /* an empty barrier - all done */
430 bio->bi_opf &= ~REQ_PREFLUSH;
431 mddev->pers->make_request(mddev, bio);
434 mddev->flush_bio = NULL;
435 wake_up(&mddev->sb_wait);
438 void md_flush_request(struct mddev *mddev, struct bio *bio)
440 spin_lock_irq(&mddev->lock);
441 wait_event_lock_irq(mddev->sb_wait,
444 mddev->flush_bio = bio;
445 spin_unlock_irq(&mddev->lock);
447 INIT_WORK(&mddev->flush_work, submit_flushes);
448 queue_work(md_wq, &mddev->flush_work);
450 EXPORT_SYMBOL(md_flush_request);
452 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
454 struct mddev *mddev = cb->data;
455 md_wakeup_thread(mddev->thread);
458 EXPORT_SYMBOL(md_unplug);
460 static inline struct mddev *mddev_get(struct mddev *mddev)
462 atomic_inc(&mddev->active);
466 static void mddev_delayed_delete(struct work_struct *ws);
468 static void mddev_put(struct mddev *mddev)
470 struct bio_set *bs = NULL;
472 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
474 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
475 mddev->ctime == 0 && !mddev->hold_active) {
476 /* Array is not configured at all, and not held active,
478 list_del_init(&mddev->all_mddevs);
480 mddev->bio_set = NULL;
481 if (mddev->gendisk) {
482 /* We did a probe so need to clean up. Call
483 * queue_work inside the spinlock so that
484 * flush_workqueue() after mddev_find will
485 * succeed in waiting for the work to be done.
487 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
488 queue_work(md_misc_wq, &mddev->del_work);
492 spin_unlock(&all_mddevs_lock);
497 static void md_safemode_timeout(unsigned long data);
499 void mddev_init(struct mddev *mddev)
501 mutex_init(&mddev->open_mutex);
502 mutex_init(&mddev->reconfig_mutex);
503 mutex_init(&mddev->bitmap_info.mutex);
504 INIT_LIST_HEAD(&mddev->disks);
505 INIT_LIST_HEAD(&mddev->all_mddevs);
506 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
507 (unsigned long) mddev);
508 atomic_set(&mddev->active, 1);
509 atomic_set(&mddev->openers, 0);
510 atomic_set(&mddev->active_io, 0);
511 spin_lock_init(&mddev->lock);
512 atomic_set(&mddev->flush_pending, 0);
513 init_waitqueue_head(&mddev->sb_wait);
514 init_waitqueue_head(&mddev->recovery_wait);
515 mddev->reshape_position = MaxSector;
516 mddev->reshape_backwards = 0;
517 mddev->last_sync_action = "none";
518 mddev->resync_min = 0;
519 mddev->resync_max = MaxSector;
520 mddev->level = LEVEL_NONE;
522 EXPORT_SYMBOL_GPL(mddev_init);
524 static struct mddev *mddev_find(dev_t unit)
526 struct mddev *mddev, *new = NULL;
528 if (unit && MAJOR(unit) != MD_MAJOR)
529 unit &= ~((1<<MdpMinorShift)-1);
532 spin_lock(&all_mddevs_lock);
535 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
536 if (mddev->unit == unit) {
538 spin_unlock(&all_mddevs_lock);
544 list_add(&new->all_mddevs, &all_mddevs);
545 spin_unlock(&all_mddevs_lock);
546 new->hold_active = UNTIL_IOCTL;
550 /* find an unused unit number */
551 static int next_minor = 512;
552 int start = next_minor;
556 dev = MKDEV(MD_MAJOR, next_minor);
558 if (next_minor > MINORMASK)
560 if (next_minor == start) {
561 /* Oh dear, all in use. */
562 spin_unlock(&all_mddevs_lock);
568 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
569 if (mddev->unit == dev) {
575 new->md_minor = MINOR(dev);
576 new->hold_active = UNTIL_STOP;
577 list_add(&new->all_mddevs, &all_mddevs);
578 spin_unlock(&all_mddevs_lock);
581 spin_unlock(&all_mddevs_lock);
583 new = kzalloc(sizeof(*new), GFP_KERNEL);
588 if (MAJOR(unit) == MD_MAJOR)
589 new->md_minor = MINOR(unit);
591 new->md_minor = MINOR(unit) >> MdpMinorShift;
598 static struct attribute_group md_redundancy_group;
600 void mddev_unlock(struct mddev *mddev)
602 if (mddev->to_remove) {
603 /* These cannot be removed under reconfig_mutex as
604 * an access to the files will try to take reconfig_mutex
605 * while holding the file unremovable, which leads to
607 * So hold set sysfs_active while the remove in happeing,
608 * and anything else which might set ->to_remove or my
609 * otherwise change the sysfs namespace will fail with
610 * -EBUSY if sysfs_active is still set.
611 * We set sysfs_active under reconfig_mutex and elsewhere
612 * test it under the same mutex to ensure its correct value
615 struct attribute_group *to_remove = mddev->to_remove;
616 mddev->to_remove = NULL;
617 mddev->sysfs_active = 1;
618 mutex_unlock(&mddev->reconfig_mutex);
620 if (mddev->kobj.sd) {
621 if (to_remove != &md_redundancy_group)
622 sysfs_remove_group(&mddev->kobj, to_remove);
623 if (mddev->pers == NULL ||
624 mddev->pers->sync_request == NULL) {
625 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
626 if (mddev->sysfs_action)
627 sysfs_put(mddev->sysfs_action);
628 mddev->sysfs_action = NULL;
631 mddev->sysfs_active = 0;
633 mutex_unlock(&mddev->reconfig_mutex);
635 /* As we've dropped the mutex we need a spinlock to
636 * make sure the thread doesn't disappear
638 spin_lock(&pers_lock);
639 md_wakeup_thread(mddev->thread);
640 spin_unlock(&pers_lock);
642 EXPORT_SYMBOL_GPL(mddev_unlock);
644 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
646 struct md_rdev *rdev;
648 rdev_for_each_rcu(rdev, mddev)
649 if (rdev->desc_nr == nr)
654 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
656 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
658 struct md_rdev *rdev;
660 rdev_for_each(rdev, mddev)
661 if (rdev->bdev->bd_dev == dev)
667 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
669 struct md_rdev *rdev;
671 rdev_for_each_rcu(rdev, mddev)
672 if (rdev->bdev->bd_dev == dev)
678 static struct md_personality *find_pers(int level, char *clevel)
680 struct md_personality *pers;
681 list_for_each_entry(pers, &pers_list, list) {
682 if (level != LEVEL_NONE && pers->level == level)
684 if (strcmp(pers->name, clevel)==0)
690 /* return the offset of the super block in 512byte sectors */
691 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
693 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
694 return MD_NEW_SIZE_SECTORS(num_sectors);
697 static int alloc_disk_sb(struct md_rdev *rdev)
699 rdev->sb_page = alloc_page(GFP_KERNEL);
705 void md_rdev_clear(struct md_rdev *rdev)
708 put_page(rdev->sb_page);
710 rdev->sb_page = NULL;
715 put_page(rdev->bb_page);
716 rdev->bb_page = NULL;
718 badblocks_exit(&rdev->badblocks);
720 EXPORT_SYMBOL_GPL(md_rdev_clear);
722 static void super_written(struct bio *bio)
724 struct md_rdev *rdev = bio->bi_private;
725 struct mddev *mddev = rdev->mddev;
728 pr_err("md: super_written gets error=%d\n", bio->bi_error);
729 md_error(mddev, rdev);
732 if (atomic_dec_and_test(&mddev->pending_writes))
733 wake_up(&mddev->sb_wait);
734 rdev_dec_pending(rdev, mddev);
738 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
739 sector_t sector, int size, struct page *page)
741 /* write first size bytes of page to sector of rdev
742 * Increment mddev->pending_writes before returning
743 * and decrement it on completion, waking up sb_wait
744 * if zero is reached.
745 * If an error occurred, call md_error
747 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
749 atomic_inc(&rdev->nr_pending);
751 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
752 bio->bi_iter.bi_sector = sector;
753 bio_add_page(bio, page, size, 0);
754 bio->bi_private = rdev;
755 bio->bi_end_io = super_written;
756 bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH_FUA);
758 atomic_inc(&mddev->pending_writes);
762 void md_super_wait(struct mddev *mddev)
764 /* wait for all superblock writes that were scheduled to complete */
765 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
768 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
769 struct page *page, int op, int op_flags, bool metadata_op)
771 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
774 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
775 rdev->meta_bdev : rdev->bdev;
776 bio_set_op_attrs(bio, op, op_flags);
778 bio->bi_iter.bi_sector = sector + rdev->sb_start;
779 else if (rdev->mddev->reshape_position != MaxSector &&
780 (rdev->mddev->reshape_backwards ==
781 (sector >= rdev->mddev->reshape_position)))
782 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
784 bio->bi_iter.bi_sector = sector + rdev->data_offset;
785 bio_add_page(bio, page, size, 0);
787 submit_bio_wait(bio);
789 ret = !bio->bi_error;
793 EXPORT_SYMBOL_GPL(sync_page_io);
795 static int read_disk_sb(struct md_rdev *rdev, int size)
797 char b[BDEVNAME_SIZE];
802 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
808 pr_err("md: disabled device %s, could not read superblock.\n",
809 bdevname(rdev->bdev,b));
813 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
815 return sb1->set_uuid0 == sb2->set_uuid0 &&
816 sb1->set_uuid1 == sb2->set_uuid1 &&
817 sb1->set_uuid2 == sb2->set_uuid2 &&
818 sb1->set_uuid3 == sb2->set_uuid3;
821 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
824 mdp_super_t *tmp1, *tmp2;
826 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
827 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
829 if (!tmp1 || !tmp2) {
838 * nr_disks is not constant
843 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
850 static u32 md_csum_fold(u32 csum)
852 csum = (csum & 0xffff) + (csum >> 16);
853 return (csum & 0xffff) + (csum >> 16);
856 static unsigned int calc_sb_csum(mdp_super_t *sb)
859 u32 *sb32 = (u32*)sb;
861 unsigned int disk_csum, csum;
863 disk_csum = sb->sb_csum;
866 for (i = 0; i < MD_SB_BYTES/4 ; i++)
868 csum = (newcsum & 0xffffffff) + (newcsum>>32);
871 /* This used to use csum_partial, which was wrong for several
872 * reasons including that different results are returned on
873 * different architectures. It isn't critical that we get exactly
874 * the same return value as before (we always csum_fold before
875 * testing, and that removes any differences). However as we
876 * know that csum_partial always returned a 16bit value on
877 * alphas, do a fold to maximise conformity to previous behaviour.
879 sb->sb_csum = md_csum_fold(disk_csum);
881 sb->sb_csum = disk_csum;
887 * Handle superblock details.
888 * We want to be able to handle multiple superblock formats
889 * so we have a common interface to them all, and an array of
890 * different handlers.
891 * We rely on user-space to write the initial superblock, and support
892 * reading and updating of superblocks.
893 * Interface methods are:
894 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
895 * loads and validates a superblock on dev.
896 * if refdev != NULL, compare superblocks on both devices
898 * 0 - dev has a superblock that is compatible with refdev
899 * 1 - dev has a superblock that is compatible and newer than refdev
900 * so dev should be used as the refdev in future
901 * -EINVAL superblock incompatible or invalid
902 * -othererror e.g. -EIO
904 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
905 * Verify that dev is acceptable into mddev.
906 * The first time, mddev->raid_disks will be 0, and data from
907 * dev should be merged in. Subsequent calls check that dev
908 * is new enough. Return 0 or -EINVAL
910 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
911 * Update the superblock for rdev with data in mddev
912 * This does not write to disc.
918 struct module *owner;
919 int (*load_super)(struct md_rdev *rdev,
920 struct md_rdev *refdev,
922 int (*validate_super)(struct mddev *mddev,
923 struct md_rdev *rdev);
924 void (*sync_super)(struct mddev *mddev,
925 struct md_rdev *rdev);
926 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
927 sector_t num_sectors);
928 int (*allow_new_offset)(struct md_rdev *rdev,
929 unsigned long long new_offset);
933 * Check that the given mddev has no bitmap.
935 * This function is called from the run method of all personalities that do not
936 * support bitmaps. It prints an error message and returns non-zero if mddev
937 * has a bitmap. Otherwise, it returns 0.
940 int md_check_no_bitmap(struct mddev *mddev)
942 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
944 pr_warn("%s: bitmaps are not supported for %s\n",
945 mdname(mddev), mddev->pers->name);
948 EXPORT_SYMBOL(md_check_no_bitmap);
951 * load_super for 0.90.0
953 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
955 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
960 * Calculate the position of the superblock (512byte sectors),
961 * it's at the end of the disk.
963 * It also happens to be a multiple of 4Kb.
965 rdev->sb_start = calc_dev_sboffset(rdev);
967 ret = read_disk_sb(rdev, MD_SB_BYTES);
973 bdevname(rdev->bdev, b);
974 sb = page_address(rdev->sb_page);
976 if (sb->md_magic != MD_SB_MAGIC) {
977 pr_warn("md: invalid raid superblock magic on %s\n", b);
981 if (sb->major_version != 0 ||
982 sb->minor_version < 90 ||
983 sb->minor_version > 91) {
984 pr_warn("Bad version number %d.%d on %s\n",
985 sb->major_version, sb->minor_version, b);
989 if (sb->raid_disks <= 0)
992 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
993 pr_warn("md: invalid superblock checksum on %s\n", b);
997 rdev->preferred_minor = sb->md_minor;
998 rdev->data_offset = 0;
999 rdev->new_data_offset = 0;
1000 rdev->sb_size = MD_SB_BYTES;
1001 rdev->badblocks.shift = -1;
1003 if (sb->level == LEVEL_MULTIPATH)
1006 rdev->desc_nr = sb->this_disk.number;
1012 mdp_super_t *refsb = page_address(refdev->sb_page);
1013 if (!uuid_equal(refsb, sb)) {
1014 pr_warn("md: %s has different UUID to %s\n",
1015 b, bdevname(refdev->bdev,b2));
1018 if (!sb_equal(refsb, sb)) {
1019 pr_warn("md: %s has same UUID but different superblock to %s\n",
1020 b, bdevname(refdev->bdev, b2));
1024 ev2 = md_event(refsb);
1030 rdev->sectors = rdev->sb_start;
1031 /* Limit to 4TB as metadata cannot record more than that.
1032 * (not needed for Linear and RAID0 as metadata doesn't
1035 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1037 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1039 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1040 /* "this cannot possibly happen" ... */
1048 * validate_super for 0.90.0
1050 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1053 mdp_super_t *sb = page_address(rdev->sb_page);
1054 __u64 ev1 = md_event(sb);
1056 rdev->raid_disk = -1;
1057 clear_bit(Faulty, &rdev->flags);
1058 clear_bit(In_sync, &rdev->flags);
1059 clear_bit(Bitmap_sync, &rdev->flags);
1060 clear_bit(WriteMostly, &rdev->flags);
1062 if (mddev->raid_disks == 0) {
1063 mddev->major_version = 0;
1064 mddev->minor_version = sb->minor_version;
1065 mddev->patch_version = sb->patch_version;
1066 mddev->external = 0;
1067 mddev->chunk_sectors = sb->chunk_size >> 9;
1068 mddev->ctime = sb->ctime;
1069 mddev->utime = sb->utime;
1070 mddev->level = sb->level;
1071 mddev->clevel[0] = 0;
1072 mddev->layout = sb->layout;
1073 mddev->raid_disks = sb->raid_disks;
1074 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1075 mddev->events = ev1;
1076 mddev->bitmap_info.offset = 0;
1077 mddev->bitmap_info.space = 0;
1078 /* bitmap can use 60 K after the 4K superblocks */
1079 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1080 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1081 mddev->reshape_backwards = 0;
1083 if (mddev->minor_version >= 91) {
1084 mddev->reshape_position = sb->reshape_position;
1085 mddev->delta_disks = sb->delta_disks;
1086 mddev->new_level = sb->new_level;
1087 mddev->new_layout = sb->new_layout;
1088 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1089 if (mddev->delta_disks < 0)
1090 mddev->reshape_backwards = 1;
1092 mddev->reshape_position = MaxSector;
1093 mddev->delta_disks = 0;
1094 mddev->new_level = mddev->level;
1095 mddev->new_layout = mddev->layout;
1096 mddev->new_chunk_sectors = mddev->chunk_sectors;
1099 if (sb->state & (1<<MD_SB_CLEAN))
1100 mddev->recovery_cp = MaxSector;
1102 if (sb->events_hi == sb->cp_events_hi &&
1103 sb->events_lo == sb->cp_events_lo) {
1104 mddev->recovery_cp = sb->recovery_cp;
1106 mddev->recovery_cp = 0;
1109 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1110 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1111 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1112 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1114 mddev->max_disks = MD_SB_DISKS;
1116 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1117 mddev->bitmap_info.file == NULL) {
1118 mddev->bitmap_info.offset =
1119 mddev->bitmap_info.default_offset;
1120 mddev->bitmap_info.space =
1121 mddev->bitmap_info.default_space;
1124 } else if (mddev->pers == NULL) {
1125 /* Insist on good event counter while assembling, except
1126 * for spares (which don't need an event count) */
1128 if (sb->disks[rdev->desc_nr].state & (
1129 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1130 if (ev1 < mddev->events)
1132 } else if (mddev->bitmap) {
1133 /* if adding to array with a bitmap, then we can accept an
1134 * older device ... but not too old.
1136 if (ev1 < mddev->bitmap->events_cleared)
1138 if (ev1 < mddev->events)
1139 set_bit(Bitmap_sync, &rdev->flags);
1141 if (ev1 < mddev->events)
1142 /* just a hot-add of a new device, leave raid_disk at -1 */
1146 if (mddev->level != LEVEL_MULTIPATH) {
1147 desc = sb->disks + rdev->desc_nr;
1149 if (desc->state & (1<<MD_DISK_FAULTY))
1150 set_bit(Faulty, &rdev->flags);
1151 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1152 desc->raid_disk < mddev->raid_disks */) {
1153 set_bit(In_sync, &rdev->flags);
1154 rdev->raid_disk = desc->raid_disk;
1155 rdev->saved_raid_disk = desc->raid_disk;
1156 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1157 /* active but not in sync implies recovery up to
1158 * reshape position. We don't know exactly where
1159 * that is, so set to zero for now */
1160 if (mddev->minor_version >= 91) {
1161 rdev->recovery_offset = 0;
1162 rdev->raid_disk = desc->raid_disk;
1165 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1166 set_bit(WriteMostly, &rdev->flags);
1167 if (desc->state & (1<<MD_DISK_FAILFAST))
1168 set_bit(FailFast, &rdev->flags);
1169 } else /* MULTIPATH are always insync */
1170 set_bit(In_sync, &rdev->flags);
1175 * sync_super for 0.90.0
1177 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1180 struct md_rdev *rdev2;
1181 int next_spare = mddev->raid_disks;
1183 /* make rdev->sb match mddev data..
1186 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1187 * 3/ any empty disks < next_spare become removed
1189 * disks[0] gets initialised to REMOVED because
1190 * we cannot be sure from other fields if it has
1191 * been initialised or not.
1194 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1196 rdev->sb_size = MD_SB_BYTES;
1198 sb = page_address(rdev->sb_page);
1200 memset(sb, 0, sizeof(*sb));
1202 sb->md_magic = MD_SB_MAGIC;
1203 sb->major_version = mddev->major_version;
1204 sb->patch_version = mddev->patch_version;
1205 sb->gvalid_words = 0; /* ignored */
1206 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1207 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1208 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1209 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1211 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1212 sb->level = mddev->level;
1213 sb->size = mddev->dev_sectors / 2;
1214 sb->raid_disks = mddev->raid_disks;
1215 sb->md_minor = mddev->md_minor;
1216 sb->not_persistent = 0;
1217 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1219 sb->events_hi = (mddev->events>>32);
1220 sb->events_lo = (u32)mddev->events;
1222 if (mddev->reshape_position == MaxSector)
1223 sb->minor_version = 90;
1225 sb->minor_version = 91;
1226 sb->reshape_position = mddev->reshape_position;
1227 sb->new_level = mddev->new_level;
1228 sb->delta_disks = mddev->delta_disks;
1229 sb->new_layout = mddev->new_layout;
1230 sb->new_chunk = mddev->new_chunk_sectors << 9;
1232 mddev->minor_version = sb->minor_version;
1235 sb->recovery_cp = mddev->recovery_cp;
1236 sb->cp_events_hi = (mddev->events>>32);
1237 sb->cp_events_lo = (u32)mddev->events;
1238 if (mddev->recovery_cp == MaxSector)
1239 sb->state = (1<< MD_SB_CLEAN);
1241 sb->recovery_cp = 0;
1243 sb->layout = mddev->layout;
1244 sb->chunk_size = mddev->chunk_sectors << 9;
1246 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1247 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1249 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1250 rdev_for_each(rdev2, mddev) {
1253 int is_active = test_bit(In_sync, &rdev2->flags);
1255 if (rdev2->raid_disk >= 0 &&
1256 sb->minor_version >= 91)
1257 /* we have nowhere to store the recovery_offset,
1258 * but if it is not below the reshape_position,
1259 * we can piggy-back on that.
1262 if (rdev2->raid_disk < 0 ||
1263 test_bit(Faulty, &rdev2->flags))
1266 desc_nr = rdev2->raid_disk;
1268 desc_nr = next_spare++;
1269 rdev2->desc_nr = desc_nr;
1270 d = &sb->disks[rdev2->desc_nr];
1272 d->number = rdev2->desc_nr;
1273 d->major = MAJOR(rdev2->bdev->bd_dev);
1274 d->minor = MINOR(rdev2->bdev->bd_dev);
1276 d->raid_disk = rdev2->raid_disk;
1278 d->raid_disk = rdev2->desc_nr; /* compatibility */
1279 if (test_bit(Faulty, &rdev2->flags))
1280 d->state = (1<<MD_DISK_FAULTY);
1281 else if (is_active) {
1282 d->state = (1<<MD_DISK_ACTIVE);
1283 if (test_bit(In_sync, &rdev2->flags))
1284 d->state |= (1<<MD_DISK_SYNC);
1292 if (test_bit(WriteMostly, &rdev2->flags))
1293 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1294 if (test_bit(FailFast, &rdev2->flags))
1295 d->state |= (1<<MD_DISK_FAILFAST);
1297 /* now set the "removed" and "faulty" bits on any missing devices */
1298 for (i=0 ; i < mddev->raid_disks ; i++) {
1299 mdp_disk_t *d = &sb->disks[i];
1300 if (d->state == 0 && d->number == 0) {
1303 d->state = (1<<MD_DISK_REMOVED);
1304 d->state |= (1<<MD_DISK_FAULTY);
1308 sb->nr_disks = nr_disks;
1309 sb->active_disks = active;
1310 sb->working_disks = working;
1311 sb->failed_disks = failed;
1312 sb->spare_disks = spare;
1314 sb->this_disk = sb->disks[rdev->desc_nr];
1315 sb->sb_csum = calc_sb_csum(sb);
1319 * rdev_size_change for 0.90.0
1321 static unsigned long long
1322 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1324 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1325 return 0; /* component must fit device */
1326 if (rdev->mddev->bitmap_info.offset)
1327 return 0; /* can't move bitmap */
1328 rdev->sb_start = calc_dev_sboffset(rdev);
1329 if (!num_sectors || num_sectors > rdev->sb_start)
1330 num_sectors = rdev->sb_start;
1331 /* Limit to 4TB as metadata cannot record more than that.
1332 * 4TB == 2^32 KB, or 2*2^32 sectors.
1334 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1335 rdev->mddev->level >= 1)
1336 num_sectors = (sector_t)(2ULL << 32) - 2;
1337 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1339 md_super_wait(rdev->mddev);
1344 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1346 /* non-zero offset changes not possible with v0.90 */
1347 return new_offset == 0;
1351 * version 1 superblock
1354 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1358 unsigned long long newcsum;
1359 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1360 __le32 *isuper = (__le32*)sb;
1362 disk_csum = sb->sb_csum;
1365 for (; size >= 4; size -= 4)
1366 newcsum += le32_to_cpu(*isuper++);
1369 newcsum += le16_to_cpu(*(__le16*) isuper);
1371 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1372 sb->sb_csum = disk_csum;
1373 return cpu_to_le32(csum);
1376 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1378 struct mdp_superblock_1 *sb;
1382 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1386 * Calculate the position of the superblock in 512byte sectors.
1387 * It is always aligned to a 4K boundary and
1388 * depeding on minor_version, it can be:
1389 * 0: At least 8K, but less than 12K, from end of device
1390 * 1: At start of device
1391 * 2: 4K from start of device.
1393 switch(minor_version) {
1395 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1397 sb_start &= ~(sector_t)(4*2-1);
1408 rdev->sb_start = sb_start;
1410 /* superblock is rarely larger than 1K, but it can be larger,
1411 * and it is safe to read 4k, so we do that
1413 ret = read_disk_sb(rdev, 4096);
1414 if (ret) return ret;
1416 sb = page_address(rdev->sb_page);
1418 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1419 sb->major_version != cpu_to_le32(1) ||
1420 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1421 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1422 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1425 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1426 pr_warn("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev->bdev,b));
1430 if (le64_to_cpu(sb->data_size) < 10) {
1431 pr_warn("md: data_size too small on %s\n",
1432 bdevname(rdev->bdev,b));
1437 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1438 /* Some padding is non-zero, might be a new feature */
1441 rdev->preferred_minor = 0xffff;
1442 rdev->data_offset = le64_to_cpu(sb->data_offset);
1443 rdev->new_data_offset = rdev->data_offset;
1444 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1445 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1446 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1447 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1449 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1450 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1451 if (rdev->sb_size & bmask)
1452 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1455 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1458 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1461 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1464 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1466 if (!rdev->bb_page) {
1467 rdev->bb_page = alloc_page(GFP_KERNEL);
1471 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1472 rdev->badblocks.count == 0) {
1473 /* need to load the bad block list.
1474 * Currently we limit it to one page.
1480 int sectors = le16_to_cpu(sb->bblog_size);
1481 if (sectors > (PAGE_SIZE / 512))
1483 offset = le32_to_cpu(sb->bblog_offset);
1486 bb_sector = (long long)offset;
1487 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1488 rdev->bb_page, REQ_OP_READ, 0, true))
1490 bbp = (u64 *)page_address(rdev->bb_page);
1491 rdev->badblocks.shift = sb->bblog_shift;
1492 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1493 u64 bb = le64_to_cpu(*bbp);
1494 int count = bb & (0x3ff);
1495 u64 sector = bb >> 10;
1496 sector <<= sb->bblog_shift;
1497 count <<= sb->bblog_shift;
1500 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1503 } else if (sb->bblog_offset != 0)
1504 rdev->badblocks.shift = 0;
1510 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1512 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1513 sb->level != refsb->level ||
1514 sb->layout != refsb->layout ||
1515 sb->chunksize != refsb->chunksize) {
1516 pr_warn("md: %s has strangely different superblock to %s\n",
1517 bdevname(rdev->bdev,b),
1518 bdevname(refdev->bdev,b2));
1521 ev1 = le64_to_cpu(sb->events);
1522 ev2 = le64_to_cpu(refsb->events);
1529 if (minor_version) {
1530 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1531 sectors -= rdev->data_offset;
1533 sectors = rdev->sb_start;
1534 if (sectors < le64_to_cpu(sb->data_size))
1536 rdev->sectors = le64_to_cpu(sb->data_size);
1540 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1542 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1543 __u64 ev1 = le64_to_cpu(sb->events);
1545 rdev->raid_disk = -1;
1546 clear_bit(Faulty, &rdev->flags);
1547 clear_bit(In_sync, &rdev->flags);
1548 clear_bit(Bitmap_sync, &rdev->flags);
1549 clear_bit(WriteMostly, &rdev->flags);
1551 if (mddev->raid_disks == 0) {
1552 mddev->major_version = 1;
1553 mddev->patch_version = 0;
1554 mddev->external = 0;
1555 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1556 mddev->ctime = le64_to_cpu(sb->ctime);
1557 mddev->utime = le64_to_cpu(sb->utime);
1558 mddev->level = le32_to_cpu(sb->level);
1559 mddev->clevel[0] = 0;
1560 mddev->layout = le32_to_cpu(sb->layout);
1561 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1562 mddev->dev_sectors = le64_to_cpu(sb->size);
1563 mddev->events = ev1;
1564 mddev->bitmap_info.offset = 0;
1565 mddev->bitmap_info.space = 0;
1566 /* Default location for bitmap is 1K after superblock
1567 * using 3K - total of 4K
1569 mddev->bitmap_info.default_offset = 1024 >> 9;
1570 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1571 mddev->reshape_backwards = 0;
1573 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1574 memcpy(mddev->uuid, sb->set_uuid, 16);
1576 mddev->max_disks = (4096-256)/2;
1578 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1579 mddev->bitmap_info.file == NULL) {
1580 mddev->bitmap_info.offset =
1581 (__s32)le32_to_cpu(sb->bitmap_offset);
1582 /* Metadata doesn't record how much space is available.
1583 * For 1.0, we assume we can use up to the superblock
1584 * if before, else to 4K beyond superblock.
1585 * For others, assume no change is possible.
1587 if (mddev->minor_version > 0)
1588 mddev->bitmap_info.space = 0;
1589 else if (mddev->bitmap_info.offset > 0)
1590 mddev->bitmap_info.space =
1591 8 - mddev->bitmap_info.offset;
1593 mddev->bitmap_info.space =
1594 -mddev->bitmap_info.offset;
1597 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1598 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1599 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1600 mddev->new_level = le32_to_cpu(sb->new_level);
1601 mddev->new_layout = le32_to_cpu(sb->new_layout);
1602 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1603 if (mddev->delta_disks < 0 ||
1604 (mddev->delta_disks == 0 &&
1605 (le32_to_cpu(sb->feature_map)
1606 & MD_FEATURE_RESHAPE_BACKWARDS)))
1607 mddev->reshape_backwards = 1;
1609 mddev->reshape_position = MaxSector;
1610 mddev->delta_disks = 0;
1611 mddev->new_level = mddev->level;
1612 mddev->new_layout = mddev->layout;
1613 mddev->new_chunk_sectors = mddev->chunk_sectors;
1616 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1617 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1618 } else if (mddev->pers == NULL) {
1619 /* Insist of good event counter while assembling, except for
1620 * spares (which don't need an event count) */
1622 if (rdev->desc_nr >= 0 &&
1623 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1624 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1625 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1626 if (ev1 < mddev->events)
1628 } else if (mddev->bitmap) {
1629 /* If adding to array with a bitmap, then we can accept an
1630 * older device, but not too old.
1632 if (ev1 < mddev->bitmap->events_cleared)
1634 if (ev1 < mddev->events)
1635 set_bit(Bitmap_sync, &rdev->flags);
1637 if (ev1 < mddev->events)
1638 /* just a hot-add of a new device, leave raid_disk at -1 */
1641 if (mddev->level != LEVEL_MULTIPATH) {
1643 if (rdev->desc_nr < 0 ||
1644 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1645 role = MD_DISK_ROLE_SPARE;
1648 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1650 case MD_DISK_ROLE_SPARE: /* spare */
1652 case MD_DISK_ROLE_FAULTY: /* faulty */
1653 set_bit(Faulty, &rdev->flags);
1655 case MD_DISK_ROLE_JOURNAL: /* journal device */
1656 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1657 /* journal device without journal feature */
1658 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1661 set_bit(Journal, &rdev->flags);
1662 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1663 rdev->raid_disk = 0;
1666 rdev->saved_raid_disk = role;
1667 if ((le32_to_cpu(sb->feature_map) &
1668 MD_FEATURE_RECOVERY_OFFSET)) {
1669 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1670 if (!(le32_to_cpu(sb->feature_map) &
1671 MD_FEATURE_RECOVERY_BITMAP))
1672 rdev->saved_raid_disk = -1;
1674 set_bit(In_sync, &rdev->flags);
1675 rdev->raid_disk = role;
1678 if (sb->devflags & WriteMostly1)
1679 set_bit(WriteMostly, &rdev->flags);
1680 if (sb->devflags & FailFast1)
1681 set_bit(FailFast, &rdev->flags);
1682 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1683 set_bit(Replacement, &rdev->flags);
1684 } else /* MULTIPATH are always insync */
1685 set_bit(In_sync, &rdev->flags);
1690 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1692 struct mdp_superblock_1 *sb;
1693 struct md_rdev *rdev2;
1695 /* make rdev->sb match mddev and rdev data. */
1697 sb = page_address(rdev->sb_page);
1699 sb->feature_map = 0;
1701 sb->recovery_offset = cpu_to_le64(0);
1702 memset(sb->pad3, 0, sizeof(sb->pad3));
1704 sb->utime = cpu_to_le64((__u64)mddev->utime);
1705 sb->events = cpu_to_le64(mddev->events);
1707 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1708 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1709 sb->resync_offset = cpu_to_le64(MaxSector);
1711 sb->resync_offset = cpu_to_le64(0);
1713 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1715 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1716 sb->size = cpu_to_le64(mddev->dev_sectors);
1717 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1718 sb->level = cpu_to_le32(mddev->level);
1719 sb->layout = cpu_to_le32(mddev->layout);
1720 if (test_bit(FailFast, &rdev->flags))
1721 sb->devflags |= FailFast1;
1723 sb->devflags &= ~FailFast1;
1725 if (test_bit(WriteMostly, &rdev->flags))
1726 sb->devflags |= WriteMostly1;
1728 sb->devflags &= ~WriteMostly1;
1729 sb->data_offset = cpu_to_le64(rdev->data_offset);
1730 sb->data_size = cpu_to_le64(rdev->sectors);
1732 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1733 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1734 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1737 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1738 !test_bit(In_sync, &rdev->flags)) {
1740 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1741 sb->recovery_offset =
1742 cpu_to_le64(rdev->recovery_offset);
1743 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1745 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1747 /* Note: recovery_offset and journal_tail share space */
1748 if (test_bit(Journal, &rdev->flags))
1749 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1750 if (test_bit(Replacement, &rdev->flags))
1752 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1754 if (mddev->reshape_position != MaxSector) {
1755 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1756 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1757 sb->new_layout = cpu_to_le32(mddev->new_layout);
1758 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1759 sb->new_level = cpu_to_le32(mddev->new_level);
1760 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1761 if (mddev->delta_disks == 0 &&
1762 mddev->reshape_backwards)
1764 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1765 if (rdev->new_data_offset != rdev->data_offset) {
1767 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1768 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1769 - rdev->data_offset));
1773 if (mddev_is_clustered(mddev))
1774 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1776 if (rdev->badblocks.count == 0)
1777 /* Nothing to do for bad blocks*/ ;
1778 else if (sb->bblog_offset == 0)
1779 /* Cannot record bad blocks on this device */
1780 md_error(mddev, rdev);
1782 struct badblocks *bb = &rdev->badblocks;
1783 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1785 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1790 seq = read_seqbegin(&bb->lock);
1792 memset(bbp, 0xff, PAGE_SIZE);
1794 for (i = 0 ; i < bb->count ; i++) {
1795 u64 internal_bb = p[i];
1796 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1797 | BB_LEN(internal_bb));
1798 bbp[i] = cpu_to_le64(store_bb);
1801 if (read_seqretry(&bb->lock, seq))
1804 bb->sector = (rdev->sb_start +
1805 (int)le32_to_cpu(sb->bblog_offset));
1806 bb->size = le16_to_cpu(sb->bblog_size);
1811 rdev_for_each(rdev2, mddev)
1812 if (rdev2->desc_nr+1 > max_dev)
1813 max_dev = rdev2->desc_nr+1;
1815 if (max_dev > le32_to_cpu(sb->max_dev)) {
1817 sb->max_dev = cpu_to_le32(max_dev);
1818 rdev->sb_size = max_dev * 2 + 256;
1819 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1820 if (rdev->sb_size & bmask)
1821 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1823 max_dev = le32_to_cpu(sb->max_dev);
1825 for (i=0; i<max_dev;i++)
1826 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1828 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1829 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1831 rdev_for_each(rdev2, mddev) {
1833 if (test_bit(Faulty, &rdev2->flags))
1834 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1835 else if (test_bit(In_sync, &rdev2->flags))
1836 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1837 else if (test_bit(Journal, &rdev2->flags))
1838 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1839 else if (rdev2->raid_disk >= 0)
1840 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1842 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1845 sb->sb_csum = calc_sb_1_csum(sb);
1848 static unsigned long long
1849 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1851 struct mdp_superblock_1 *sb;
1852 sector_t max_sectors;
1853 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1854 return 0; /* component must fit device */
1855 if (rdev->data_offset != rdev->new_data_offset)
1856 return 0; /* too confusing */
1857 if (rdev->sb_start < rdev->data_offset) {
1858 /* minor versions 1 and 2; superblock before data */
1859 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1860 max_sectors -= rdev->data_offset;
1861 if (!num_sectors || num_sectors > max_sectors)
1862 num_sectors = max_sectors;
1863 } else if (rdev->mddev->bitmap_info.offset) {
1864 /* minor version 0 with bitmap we can't move */
1867 /* minor version 0; superblock after data */
1869 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1870 sb_start &= ~(sector_t)(4*2 - 1);
1871 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1872 if (!num_sectors || num_sectors > max_sectors)
1873 num_sectors = max_sectors;
1874 rdev->sb_start = sb_start;
1876 sb = page_address(rdev->sb_page);
1877 sb->data_size = cpu_to_le64(num_sectors);
1878 sb->super_offset = rdev->sb_start;
1879 sb->sb_csum = calc_sb_1_csum(sb);
1880 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1882 md_super_wait(rdev->mddev);
1888 super_1_allow_new_offset(struct md_rdev *rdev,
1889 unsigned long long new_offset)
1891 /* All necessary checks on new >= old have been done */
1892 struct bitmap *bitmap;
1893 if (new_offset >= rdev->data_offset)
1896 /* with 1.0 metadata, there is no metadata to tread on
1897 * so we can always move back */
1898 if (rdev->mddev->minor_version == 0)
1901 /* otherwise we must be sure not to step on
1902 * any metadata, so stay:
1903 * 36K beyond start of superblock
1904 * beyond end of badblocks
1905 * beyond write-intent bitmap
1907 if (rdev->sb_start + (32+4)*2 > new_offset)
1909 bitmap = rdev->mddev->bitmap;
1910 if (bitmap && !rdev->mddev->bitmap_info.file &&
1911 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1912 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1914 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1920 static struct super_type super_types[] = {
1923 .owner = THIS_MODULE,
1924 .load_super = super_90_load,
1925 .validate_super = super_90_validate,
1926 .sync_super = super_90_sync,
1927 .rdev_size_change = super_90_rdev_size_change,
1928 .allow_new_offset = super_90_allow_new_offset,
1932 .owner = THIS_MODULE,
1933 .load_super = super_1_load,
1934 .validate_super = super_1_validate,
1935 .sync_super = super_1_sync,
1936 .rdev_size_change = super_1_rdev_size_change,
1937 .allow_new_offset = super_1_allow_new_offset,
1941 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1943 if (mddev->sync_super) {
1944 mddev->sync_super(mddev, rdev);
1948 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1950 super_types[mddev->major_version].sync_super(mddev, rdev);
1953 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1955 struct md_rdev *rdev, *rdev2;
1958 rdev_for_each_rcu(rdev, mddev1) {
1959 if (test_bit(Faulty, &rdev->flags) ||
1960 test_bit(Journal, &rdev->flags) ||
1961 rdev->raid_disk == -1)
1963 rdev_for_each_rcu(rdev2, mddev2) {
1964 if (test_bit(Faulty, &rdev2->flags) ||
1965 test_bit(Journal, &rdev2->flags) ||
1966 rdev2->raid_disk == -1)
1968 if (rdev->bdev->bd_contains ==
1969 rdev2->bdev->bd_contains) {
1979 static LIST_HEAD(pending_raid_disks);
1982 * Try to register data integrity profile for an mddev
1984 * This is called when an array is started and after a disk has been kicked
1985 * from the array. It only succeeds if all working and active component devices
1986 * are integrity capable with matching profiles.
1988 int md_integrity_register(struct mddev *mddev)
1990 struct md_rdev *rdev, *reference = NULL;
1992 if (list_empty(&mddev->disks))
1993 return 0; /* nothing to do */
1994 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1995 return 0; /* shouldn't register, or already is */
1996 rdev_for_each(rdev, mddev) {
1997 /* skip spares and non-functional disks */
1998 if (test_bit(Faulty, &rdev->flags))
2000 if (rdev->raid_disk < 0)
2003 /* Use the first rdev as the reference */
2007 /* does this rdev's profile match the reference profile? */
2008 if (blk_integrity_compare(reference->bdev->bd_disk,
2009 rdev->bdev->bd_disk) < 0)
2012 if (!reference || !bdev_get_integrity(reference->bdev))
2015 * All component devices are integrity capable and have matching
2016 * profiles, register the common profile for the md device.
2018 blk_integrity_register(mddev->gendisk,
2019 bdev_get_integrity(reference->bdev));
2021 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2022 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2023 pr_err("md: failed to create integrity pool for %s\n",
2029 EXPORT_SYMBOL(md_integrity_register);
2032 * Attempt to add an rdev, but only if it is consistent with the current
2035 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2037 struct blk_integrity *bi_rdev;
2038 struct blk_integrity *bi_mddev;
2039 char name[BDEVNAME_SIZE];
2041 if (!mddev->gendisk)
2044 bi_rdev = bdev_get_integrity(rdev->bdev);
2045 bi_mddev = blk_get_integrity(mddev->gendisk);
2047 if (!bi_mddev) /* nothing to do */
2050 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2051 pr_err("%s: incompatible integrity profile for %s\n",
2052 mdname(mddev), bdevname(rdev->bdev, name));
2058 EXPORT_SYMBOL(md_integrity_add_rdev);
2060 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2062 char b[BDEVNAME_SIZE];
2066 /* prevent duplicates */
2067 if (find_rdev(mddev, rdev->bdev->bd_dev))
2070 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2071 if (!test_bit(Journal, &rdev->flags) &&
2073 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2075 /* Cannot change size, so fail
2076 * If mddev->level <= 0, then we don't care
2077 * about aligning sizes (e.g. linear)
2079 if (mddev->level > 0)
2082 mddev->dev_sectors = rdev->sectors;
2085 /* Verify rdev->desc_nr is unique.
2086 * If it is -1, assign a free number, else
2087 * check number is not in use
2090 if (rdev->desc_nr < 0) {
2093 choice = mddev->raid_disks;
2094 while (md_find_rdev_nr_rcu(mddev, choice))
2096 rdev->desc_nr = choice;
2098 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2104 if (!test_bit(Journal, &rdev->flags) &&
2105 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2106 pr_warn("md: %s: array is limited to %d devices\n",
2107 mdname(mddev), mddev->max_disks);
2110 bdevname(rdev->bdev,b);
2111 strreplace(b, '/', '!');
2113 rdev->mddev = mddev;
2114 pr_debug("md: bind<%s>\n", b);
2116 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2119 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2120 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2121 /* failure here is OK */;
2122 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2124 list_add_rcu(&rdev->same_set, &mddev->disks);
2125 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2127 /* May as well allow recovery to be retried once */
2128 mddev->recovery_disabled++;
2133 pr_warn("md: failed to register dev-%s for %s\n",
2138 static void md_delayed_delete(struct work_struct *ws)
2140 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2141 kobject_del(&rdev->kobj);
2142 kobject_put(&rdev->kobj);
2145 static void unbind_rdev_from_array(struct md_rdev *rdev)
2147 char b[BDEVNAME_SIZE];
2149 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2150 list_del_rcu(&rdev->same_set);
2151 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2153 sysfs_remove_link(&rdev->kobj, "block");
2154 sysfs_put(rdev->sysfs_state);
2155 rdev->sysfs_state = NULL;
2156 rdev->badblocks.count = 0;
2157 /* We need to delay this, otherwise we can deadlock when
2158 * writing to 'remove' to "dev/state". We also need
2159 * to delay it due to rcu usage.
2162 INIT_WORK(&rdev->del_work, md_delayed_delete);
2163 kobject_get(&rdev->kobj);
2164 queue_work(md_misc_wq, &rdev->del_work);
2168 * prevent the device from being mounted, repartitioned or
2169 * otherwise reused by a RAID array (or any other kernel
2170 * subsystem), by bd_claiming the device.
2172 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2175 struct block_device *bdev;
2176 char b[BDEVNAME_SIZE];
2178 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2179 shared ? (struct md_rdev *)lock_rdev : rdev);
2181 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2182 return PTR_ERR(bdev);
2188 static void unlock_rdev(struct md_rdev *rdev)
2190 struct block_device *bdev = rdev->bdev;
2192 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2195 void md_autodetect_dev(dev_t dev);
2197 static void export_rdev(struct md_rdev *rdev)
2199 char b[BDEVNAME_SIZE];
2201 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2202 md_rdev_clear(rdev);
2204 if (test_bit(AutoDetected, &rdev->flags))
2205 md_autodetect_dev(rdev->bdev->bd_dev);
2208 kobject_put(&rdev->kobj);
2211 void md_kick_rdev_from_array(struct md_rdev *rdev)
2213 unbind_rdev_from_array(rdev);
2216 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2218 static void export_array(struct mddev *mddev)
2220 struct md_rdev *rdev;
2222 while (!list_empty(&mddev->disks)) {
2223 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2225 md_kick_rdev_from_array(rdev);
2227 mddev->raid_disks = 0;
2228 mddev->major_version = 0;
2231 static void sync_sbs(struct mddev *mddev, int nospares)
2233 /* Update each superblock (in-memory image), but
2234 * if we are allowed to, skip spares which already
2235 * have the right event counter, or have one earlier
2236 * (which would mean they aren't being marked as dirty
2237 * with the rest of the array)
2239 struct md_rdev *rdev;
2240 rdev_for_each(rdev, mddev) {
2241 if (rdev->sb_events == mddev->events ||
2243 rdev->raid_disk < 0 &&
2244 rdev->sb_events+1 == mddev->events)) {
2245 /* Don't update this superblock */
2246 rdev->sb_loaded = 2;
2248 sync_super(mddev, rdev);
2249 rdev->sb_loaded = 1;
2254 static bool does_sb_need_changing(struct mddev *mddev)
2256 struct md_rdev *rdev;
2257 struct mdp_superblock_1 *sb;
2260 /* Find a good rdev */
2261 rdev_for_each(rdev, mddev)
2262 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2265 /* No good device found. */
2269 sb = page_address(rdev->sb_page);
2270 /* Check if a device has become faulty or a spare become active */
2271 rdev_for_each(rdev, mddev) {
2272 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2273 /* Device activated? */
2274 if (role == 0xffff && rdev->raid_disk >=0 &&
2275 !test_bit(Faulty, &rdev->flags))
2277 /* Device turned faulty? */
2278 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2282 /* Check if any mddev parameters have changed */
2283 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2284 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2285 (mddev->layout != le64_to_cpu(sb->layout)) ||
2286 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2287 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2293 void md_update_sb(struct mddev *mddev, int force_change)
2295 struct md_rdev *rdev;
2298 int any_badblocks_changed = 0;
2303 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2308 if (mddev_is_clustered(mddev)) {
2309 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2311 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2313 ret = md_cluster_ops->metadata_update_start(mddev);
2314 /* Has someone else has updated the sb */
2315 if (!does_sb_need_changing(mddev)) {
2317 md_cluster_ops->metadata_update_cancel(mddev);
2318 bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2319 BIT(MD_CHANGE_DEVS) |
2320 BIT(MD_CHANGE_CLEAN));
2325 /* First make sure individual recovery_offsets are correct */
2326 rdev_for_each(rdev, mddev) {
2327 if (rdev->raid_disk >= 0 &&
2328 mddev->delta_disks >= 0 &&
2329 !test_bit(Journal, &rdev->flags) &&
2330 !test_bit(In_sync, &rdev->flags) &&
2331 mddev->curr_resync_completed > rdev->recovery_offset)
2332 rdev->recovery_offset = mddev->curr_resync_completed;
2335 if (!mddev->persistent) {
2336 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2337 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2338 if (!mddev->external) {
2339 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2340 rdev_for_each(rdev, mddev) {
2341 if (rdev->badblocks.changed) {
2342 rdev->badblocks.changed = 0;
2343 ack_all_badblocks(&rdev->badblocks);
2344 md_error(mddev, rdev);
2346 clear_bit(Blocked, &rdev->flags);
2347 clear_bit(BlockedBadBlocks, &rdev->flags);
2348 wake_up(&rdev->blocked_wait);
2351 wake_up(&mddev->sb_wait);
2355 spin_lock(&mddev->lock);
2357 mddev->utime = ktime_get_real_seconds();
2359 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2361 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2362 /* just a clean<-> dirty transition, possibly leave spares alone,
2363 * though if events isn't the right even/odd, we will have to do
2369 if (mddev->degraded)
2370 /* If the array is degraded, then skipping spares is both
2371 * dangerous and fairly pointless.
2372 * Dangerous because a device that was removed from the array
2373 * might have a event_count that still looks up-to-date,
2374 * so it can be re-added without a resync.
2375 * Pointless because if there are any spares to skip,
2376 * then a recovery will happen and soon that array won't
2377 * be degraded any more and the spare can go back to sleep then.
2381 sync_req = mddev->in_sync;
2383 /* If this is just a dirty<->clean transition, and the array is clean
2384 * and 'events' is odd, we can roll back to the previous clean state */
2386 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2387 && mddev->can_decrease_events
2388 && mddev->events != 1) {
2390 mddev->can_decrease_events = 0;
2392 /* otherwise we have to go forward and ... */
2394 mddev->can_decrease_events = nospares;
2398 * This 64-bit counter should never wrap.
2399 * Either we are in around ~1 trillion A.C., assuming
2400 * 1 reboot per second, or we have a bug...
2402 WARN_ON(mddev->events == 0);
2404 rdev_for_each(rdev, mddev) {
2405 if (rdev->badblocks.changed)
2406 any_badblocks_changed++;
2407 if (test_bit(Faulty, &rdev->flags))
2408 set_bit(FaultRecorded, &rdev->flags);
2411 sync_sbs(mddev, nospares);
2412 spin_unlock(&mddev->lock);
2414 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2415 mdname(mddev), mddev->in_sync);
2418 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2419 bitmap_update_sb(mddev->bitmap);
2420 rdev_for_each(rdev, mddev) {
2421 char b[BDEVNAME_SIZE];
2423 if (rdev->sb_loaded != 1)
2424 continue; /* no noise on spare devices */
2426 if (!test_bit(Faulty, &rdev->flags)) {
2427 md_super_write(mddev,rdev,
2428 rdev->sb_start, rdev->sb_size,
2430 pr_debug("md: (write) %s's sb offset: %llu\n",
2431 bdevname(rdev->bdev, b),
2432 (unsigned long long)rdev->sb_start);
2433 rdev->sb_events = mddev->events;
2434 if (rdev->badblocks.size) {
2435 md_super_write(mddev, rdev,
2436 rdev->badblocks.sector,
2437 rdev->badblocks.size << 9,
2439 rdev->badblocks.size = 0;
2443 pr_debug("md: %s (skipping faulty)\n",
2444 bdevname(rdev->bdev, b));
2446 if (mddev->level == LEVEL_MULTIPATH)
2447 /* only need to write one superblock... */
2450 md_super_wait(mddev);
2451 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2453 if (mddev_is_clustered(mddev) && ret == 0)
2454 md_cluster_ops->metadata_update_finish(mddev);
2456 if (mddev->in_sync != sync_req ||
2457 !bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2458 BIT(MD_CHANGE_DEVS) | BIT(MD_CHANGE_CLEAN)))
2459 /* have to write it out again */
2461 wake_up(&mddev->sb_wait);
2462 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2463 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2465 rdev_for_each(rdev, mddev) {
2466 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2467 clear_bit(Blocked, &rdev->flags);
2469 if (any_badblocks_changed)
2470 ack_all_badblocks(&rdev->badblocks);
2471 clear_bit(BlockedBadBlocks, &rdev->flags);
2472 wake_up(&rdev->blocked_wait);
2475 EXPORT_SYMBOL(md_update_sb);
2477 static int add_bound_rdev(struct md_rdev *rdev)
2479 struct mddev *mddev = rdev->mddev;
2481 bool add_journal = test_bit(Journal, &rdev->flags);
2483 if (!mddev->pers->hot_remove_disk || add_journal) {
2484 /* If there is hot_add_disk but no hot_remove_disk
2485 * then added disks for geometry changes,
2486 * and should be added immediately.
2488 super_types[mddev->major_version].
2489 validate_super(mddev, rdev);
2491 mddev_suspend(mddev);
2492 err = mddev->pers->hot_add_disk(mddev, rdev);
2494 mddev_resume(mddev);
2496 md_kick_rdev_from_array(rdev);
2500 sysfs_notify_dirent_safe(rdev->sysfs_state);
2502 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2503 if (mddev->degraded)
2504 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2505 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2506 md_new_event(mddev);
2507 md_wakeup_thread(mddev->thread);
2511 /* words written to sysfs files may, or may not, be \n terminated.
2512 * We want to accept with case. For this we use cmd_match.
2514 static int cmd_match(const char *cmd, const char *str)
2516 /* See if cmd, written into a sysfs file, matches
2517 * str. They must either be the same, or cmd can
2518 * have a trailing newline
2520 while (*cmd && *str && *cmd == *str) {
2531 struct rdev_sysfs_entry {
2532 struct attribute attr;
2533 ssize_t (*show)(struct md_rdev *, char *);
2534 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2538 state_show(struct md_rdev *rdev, char *page)
2542 unsigned long flags = ACCESS_ONCE(rdev->flags);
2544 if (test_bit(Faulty, &flags) ||
2545 (!test_bit(ExternalBbl, &flags) &&
2546 rdev->badblocks.unacked_exist))
2547 len += sprintf(page+len, "faulty%s", sep);
2548 if (test_bit(In_sync, &flags))
2549 len += sprintf(page+len, "in_sync%s", sep);
2550 if (test_bit(Journal, &flags))
2551 len += sprintf(page+len, "journal%s", sep);
2552 if (test_bit(WriteMostly, &flags))
2553 len += sprintf(page+len, "write_mostly%s", sep);
2554 if (test_bit(Blocked, &flags) ||
2555 (rdev->badblocks.unacked_exist
2556 && !test_bit(Faulty, &flags)))
2557 len += sprintf(page+len, "blocked%s", sep);
2558 if (!test_bit(Faulty, &flags) &&
2559 !test_bit(Journal, &flags) &&
2560 !test_bit(In_sync, &flags))
2561 len += sprintf(page+len, "spare%s", sep);
2562 if (test_bit(WriteErrorSeen, &flags))
2563 len += sprintf(page+len, "write_error%s", sep);
2564 if (test_bit(WantReplacement, &flags))
2565 len += sprintf(page+len, "want_replacement%s", sep);
2566 if (test_bit(Replacement, &flags))
2567 len += sprintf(page+len, "replacement%s", sep);
2568 if (test_bit(ExternalBbl, &flags))
2569 len += sprintf(page+len, "external_bbl%s", sep);
2570 if (test_bit(FailFast, &flags))
2571 len += sprintf(page+len, "failfast%s", sep);
2576 return len+sprintf(page+len, "\n");
2580 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2583 * faulty - simulates an error
2584 * remove - disconnects the device
2585 * writemostly - sets write_mostly
2586 * -writemostly - clears write_mostly
2587 * blocked - sets the Blocked flags
2588 * -blocked - clears the Blocked and possibly simulates an error
2589 * insync - sets Insync providing device isn't active
2590 * -insync - clear Insync for a device with a slot assigned,
2591 * so that it gets rebuilt based on bitmap
2592 * write_error - sets WriteErrorSeen
2593 * -write_error - clears WriteErrorSeen
2594 * {,-}failfast - set/clear FailFast
2597 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2598 md_error(rdev->mddev, rdev);
2599 if (test_bit(Faulty, &rdev->flags))
2603 } else if (cmd_match(buf, "remove")) {
2604 if (rdev->mddev->pers) {
2605 clear_bit(Blocked, &rdev->flags);
2606 remove_and_add_spares(rdev->mddev, rdev);
2608 if (rdev->raid_disk >= 0)
2611 struct mddev *mddev = rdev->mddev;
2613 if (mddev_is_clustered(mddev))
2614 err = md_cluster_ops->remove_disk(mddev, rdev);
2617 md_kick_rdev_from_array(rdev);
2619 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2620 md_wakeup_thread(mddev->thread);
2622 md_new_event(mddev);
2625 } else if (cmd_match(buf, "writemostly")) {
2626 set_bit(WriteMostly, &rdev->flags);
2628 } else if (cmd_match(buf, "-writemostly")) {
2629 clear_bit(WriteMostly, &rdev->flags);
2631 } else if (cmd_match(buf, "blocked")) {
2632 set_bit(Blocked, &rdev->flags);
2634 } else if (cmd_match(buf, "-blocked")) {
2635 if (!test_bit(Faulty, &rdev->flags) &&
2636 !test_bit(ExternalBbl, &rdev->flags) &&
2637 rdev->badblocks.unacked_exist) {
2638 /* metadata handler doesn't understand badblocks,
2639 * so we need to fail the device
2641 md_error(rdev->mddev, rdev);
2643 clear_bit(Blocked, &rdev->flags);
2644 clear_bit(BlockedBadBlocks, &rdev->flags);
2645 wake_up(&rdev->blocked_wait);
2646 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2647 md_wakeup_thread(rdev->mddev->thread);
2650 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2651 set_bit(In_sync, &rdev->flags);
2653 } else if (cmd_match(buf, "failfast")) {
2654 set_bit(FailFast, &rdev->flags);
2656 } else if (cmd_match(buf, "-failfast")) {
2657 clear_bit(FailFast, &rdev->flags);
2659 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2660 !test_bit(Journal, &rdev->flags)) {
2661 if (rdev->mddev->pers == NULL) {
2662 clear_bit(In_sync, &rdev->flags);
2663 rdev->saved_raid_disk = rdev->raid_disk;
2664 rdev->raid_disk = -1;
2667 } else if (cmd_match(buf, "write_error")) {
2668 set_bit(WriteErrorSeen, &rdev->flags);
2670 } else if (cmd_match(buf, "-write_error")) {
2671 clear_bit(WriteErrorSeen, &rdev->flags);
2673 } else if (cmd_match(buf, "want_replacement")) {
2674 /* Any non-spare device that is not a replacement can
2675 * become want_replacement at any time, but we then need to
2676 * check if recovery is needed.
2678 if (rdev->raid_disk >= 0 &&
2679 !test_bit(Journal, &rdev->flags) &&
2680 !test_bit(Replacement, &rdev->flags))
2681 set_bit(WantReplacement, &rdev->flags);
2682 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2683 md_wakeup_thread(rdev->mddev->thread);
2685 } else if (cmd_match(buf, "-want_replacement")) {
2686 /* Clearing 'want_replacement' is always allowed.
2687 * Once replacements starts it is too late though.
2690 clear_bit(WantReplacement, &rdev->flags);
2691 } else if (cmd_match(buf, "replacement")) {
2692 /* Can only set a device as a replacement when array has not
2693 * yet been started. Once running, replacement is automatic
2694 * from spares, or by assigning 'slot'.
2696 if (rdev->mddev->pers)
2699 set_bit(Replacement, &rdev->flags);
2702 } else if (cmd_match(buf, "-replacement")) {
2703 /* Similarly, can only clear Replacement before start */
2704 if (rdev->mddev->pers)
2707 clear_bit(Replacement, &rdev->flags);
2710 } else if (cmd_match(buf, "re-add")) {
2711 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2712 /* clear_bit is performed _after_ all the devices
2713 * have their local Faulty bit cleared. If any writes
2714 * happen in the meantime in the local node, they
2715 * will land in the local bitmap, which will be synced
2716 * by this node eventually
2718 if (!mddev_is_clustered(rdev->mddev) ||
2719 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2720 clear_bit(Faulty, &rdev->flags);
2721 err = add_bound_rdev(rdev);
2725 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2726 set_bit(ExternalBbl, &rdev->flags);
2727 rdev->badblocks.shift = 0;
2729 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2730 clear_bit(ExternalBbl, &rdev->flags);
2734 sysfs_notify_dirent_safe(rdev->sysfs_state);
2735 return err ? err : len;
2737 static struct rdev_sysfs_entry rdev_state =
2738 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2741 errors_show(struct md_rdev *rdev, char *page)
2743 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2747 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2752 rv = kstrtouint(buf, 10, &n);
2755 atomic_set(&rdev->corrected_errors, n);
2758 static struct rdev_sysfs_entry rdev_errors =
2759 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2762 slot_show(struct md_rdev *rdev, char *page)
2764 if (test_bit(Journal, &rdev->flags))
2765 return sprintf(page, "journal\n");
2766 else if (rdev->raid_disk < 0)
2767 return sprintf(page, "none\n");
2769 return sprintf(page, "%d\n", rdev->raid_disk);
2773 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2778 if (test_bit(Journal, &rdev->flags))
2780 if (strncmp(buf, "none", 4)==0)
2783 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2787 if (rdev->mddev->pers && slot == -1) {
2788 /* Setting 'slot' on an active array requires also
2789 * updating the 'rd%d' link, and communicating
2790 * with the personality with ->hot_*_disk.
2791 * For now we only support removing
2792 * failed/spare devices. This normally happens automatically,
2793 * but not when the metadata is externally managed.
2795 if (rdev->raid_disk == -1)
2797 /* personality does all needed checks */
2798 if (rdev->mddev->pers->hot_remove_disk == NULL)
2800 clear_bit(Blocked, &rdev->flags);
2801 remove_and_add_spares(rdev->mddev, rdev);
2802 if (rdev->raid_disk >= 0)
2804 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2805 md_wakeup_thread(rdev->mddev->thread);
2806 } else if (rdev->mddev->pers) {
2807 /* Activating a spare .. or possibly reactivating
2808 * if we ever get bitmaps working here.
2812 if (rdev->raid_disk != -1)
2815 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2818 if (rdev->mddev->pers->hot_add_disk == NULL)
2821 if (slot >= rdev->mddev->raid_disks &&
2822 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2825 rdev->raid_disk = slot;
2826 if (test_bit(In_sync, &rdev->flags))
2827 rdev->saved_raid_disk = slot;
2829 rdev->saved_raid_disk = -1;
2830 clear_bit(In_sync, &rdev->flags);
2831 clear_bit(Bitmap_sync, &rdev->flags);
2832 err = rdev->mddev->pers->
2833 hot_add_disk(rdev->mddev, rdev);
2835 rdev->raid_disk = -1;
2838 sysfs_notify_dirent_safe(rdev->sysfs_state);
2839 if (sysfs_link_rdev(rdev->mddev, rdev))
2840 /* failure here is OK */;
2841 /* don't wakeup anyone, leave that to userspace. */
2843 if (slot >= rdev->mddev->raid_disks &&
2844 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2846 rdev->raid_disk = slot;
2847 /* assume it is working */
2848 clear_bit(Faulty, &rdev->flags);
2849 clear_bit(WriteMostly, &rdev->flags);
2850 set_bit(In_sync, &rdev->flags);
2851 sysfs_notify_dirent_safe(rdev->sysfs_state);
2856 static struct rdev_sysfs_entry rdev_slot =
2857 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2860 offset_show(struct md_rdev *rdev, char *page)
2862 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2866 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2868 unsigned long long offset;
2869 if (kstrtoull(buf, 10, &offset) < 0)
2871 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2873 if (rdev->sectors && rdev->mddev->external)
2874 /* Must set offset before size, so overlap checks
2877 rdev->data_offset = offset;
2878 rdev->new_data_offset = offset;
2882 static struct rdev_sysfs_entry rdev_offset =
2883 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2885 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2887 return sprintf(page, "%llu\n",
2888 (unsigned long long)rdev->new_data_offset);
2891 static ssize_t new_offset_store(struct md_rdev *rdev,
2892 const char *buf, size_t len)
2894 unsigned long long new_offset;
2895 struct mddev *mddev = rdev->mddev;
2897 if (kstrtoull(buf, 10, &new_offset) < 0)
2900 if (mddev->sync_thread ||
2901 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2903 if (new_offset == rdev->data_offset)
2904 /* reset is always permitted */
2906 else if (new_offset > rdev->data_offset) {
2907 /* must not push array size beyond rdev_sectors */
2908 if (new_offset - rdev->data_offset
2909 + mddev->dev_sectors > rdev->sectors)
2912 /* Metadata worries about other space details. */
2914 /* decreasing the offset is inconsistent with a backwards
2917 if (new_offset < rdev->data_offset &&
2918 mddev->reshape_backwards)
2920 /* Increasing offset is inconsistent with forwards
2921 * reshape. reshape_direction should be set to
2922 * 'backwards' first.
2924 if (new_offset > rdev->data_offset &&
2925 !mddev->reshape_backwards)
2928 if (mddev->pers && mddev->persistent &&
2929 !super_types[mddev->major_version]
2930 .allow_new_offset(rdev, new_offset))
2932 rdev->new_data_offset = new_offset;
2933 if (new_offset > rdev->data_offset)
2934 mddev->reshape_backwards = 1;
2935 else if (new_offset < rdev->data_offset)
2936 mddev->reshape_backwards = 0;
2940 static struct rdev_sysfs_entry rdev_new_offset =
2941 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2944 rdev_size_show(struct md_rdev *rdev, char *page)
2946 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2949 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2951 /* check if two start/length pairs overlap */
2959 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2961 unsigned long long blocks;
2964 if (kstrtoull(buf, 10, &blocks) < 0)
2967 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2968 return -EINVAL; /* sector conversion overflow */
2971 if (new != blocks * 2)
2972 return -EINVAL; /* unsigned long long to sector_t overflow */
2979 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2981 struct mddev *my_mddev = rdev->mddev;
2982 sector_t oldsectors = rdev->sectors;
2985 if (test_bit(Journal, &rdev->flags))
2987 if (strict_blocks_to_sectors(buf, §ors) < 0)
2989 if (rdev->data_offset != rdev->new_data_offset)
2990 return -EINVAL; /* too confusing */
2991 if (my_mddev->pers && rdev->raid_disk >= 0) {
2992 if (my_mddev->persistent) {
2993 sectors = super_types[my_mddev->major_version].
2994 rdev_size_change(rdev, sectors);
2997 } else if (!sectors)
2998 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3000 if (!my_mddev->pers->resize)
3001 /* Cannot change size for RAID0 or Linear etc */
3004 if (sectors < my_mddev->dev_sectors)
3005 return -EINVAL; /* component must fit device */
3007 rdev->sectors = sectors;
3008 if (sectors > oldsectors && my_mddev->external) {
3009 /* Need to check that all other rdevs with the same
3010 * ->bdev do not overlap. 'rcu' is sufficient to walk
3011 * the rdev lists safely.
3012 * This check does not provide a hard guarantee, it
3013 * just helps avoid dangerous mistakes.
3015 struct mddev *mddev;
3017 struct list_head *tmp;
3020 for_each_mddev(mddev, tmp) {
3021 struct md_rdev *rdev2;
3023 rdev_for_each(rdev2, mddev)
3024 if (rdev->bdev == rdev2->bdev &&
3026 overlaps(rdev->data_offset, rdev->sectors,
3039 /* Someone else could have slipped in a size
3040 * change here, but doing so is just silly.
3041 * We put oldsectors back because we *know* it is
3042 * safe, and trust userspace not to race with
3045 rdev->sectors = oldsectors;
3052 static struct rdev_sysfs_entry rdev_size =
3053 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3055 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3057 unsigned long long recovery_start = rdev->recovery_offset;
3059 if (test_bit(In_sync, &rdev->flags) ||
3060 recovery_start == MaxSector)
3061 return sprintf(page, "none\n");
3063 return sprintf(page, "%llu\n", recovery_start);
3066 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3068 unsigned long long recovery_start;
3070 if (cmd_match(buf, "none"))
3071 recovery_start = MaxSector;
3072 else if (kstrtoull(buf, 10, &recovery_start))
3075 if (rdev->mddev->pers &&
3076 rdev->raid_disk >= 0)
3079 rdev->recovery_offset = recovery_start;
3080 if (recovery_start == MaxSector)
3081 set_bit(In_sync, &rdev->flags);
3083 clear_bit(In_sync, &rdev->flags);
3087 static struct rdev_sysfs_entry rdev_recovery_start =
3088 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3090 /* sysfs access to bad-blocks list.
3091 * We present two files.
3092 * 'bad-blocks' lists sector numbers and lengths of ranges that
3093 * are recorded as bad. The list is truncated to fit within
3094 * the one-page limit of sysfs.
3095 * Writing "sector length" to this file adds an acknowledged
3097 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3098 * been acknowledged. Writing to this file adds bad blocks
3099 * without acknowledging them. This is largely for testing.
3101 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3103 return badblocks_show(&rdev->badblocks, page, 0);
3105 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3107 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3108 /* Maybe that ack was all we needed */
3109 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3110 wake_up(&rdev->blocked_wait);
3113 static struct rdev_sysfs_entry rdev_bad_blocks =
3114 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3116 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3118 return badblocks_show(&rdev->badblocks, page, 1);
3120 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3122 return badblocks_store(&rdev->badblocks, page, len, 1);
3124 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3125 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3127 static struct attribute *rdev_default_attrs[] = {
3132 &rdev_new_offset.attr,
3134 &rdev_recovery_start.attr,
3135 &rdev_bad_blocks.attr,
3136 &rdev_unack_bad_blocks.attr,
3140 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3142 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3143 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3149 return entry->show(rdev, page);
3153 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3154 const char *page, size_t length)
3156 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3157 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3159 struct mddev *mddev = rdev->mddev;
3163 if (!capable(CAP_SYS_ADMIN))
3165 rv = mddev ? mddev_lock(mddev): -EBUSY;
3167 if (rdev->mddev == NULL)
3170 rv = entry->store(rdev, page, length);
3171 mddev_unlock(mddev);
3176 static void rdev_free(struct kobject *ko)
3178 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3181 static const struct sysfs_ops rdev_sysfs_ops = {
3182 .show = rdev_attr_show,
3183 .store = rdev_attr_store,
3185 static struct kobj_type rdev_ktype = {
3186 .release = rdev_free,
3187 .sysfs_ops = &rdev_sysfs_ops,
3188 .default_attrs = rdev_default_attrs,
3191 int md_rdev_init(struct md_rdev *rdev)
3194 rdev->saved_raid_disk = -1;
3195 rdev->raid_disk = -1;
3197 rdev->data_offset = 0;
3198 rdev->new_data_offset = 0;
3199 rdev->sb_events = 0;
3200 rdev->last_read_error = 0;
3201 rdev->sb_loaded = 0;
3202 rdev->bb_page = NULL;
3203 atomic_set(&rdev->nr_pending, 0);
3204 atomic_set(&rdev->read_errors, 0);
3205 atomic_set(&rdev->corrected_errors, 0);
3207 INIT_LIST_HEAD(&rdev->same_set);
3208 init_waitqueue_head(&rdev->blocked_wait);
3210 /* Add space to store bad block list.
3211 * This reserves the space even on arrays where it cannot
3212 * be used - I wonder if that matters
3214 return badblocks_init(&rdev->badblocks, 0);
3216 EXPORT_SYMBOL_GPL(md_rdev_init);
3218 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3220 * mark the device faulty if:
3222 * - the device is nonexistent (zero size)
3223 * - the device has no valid superblock
3225 * a faulty rdev _never_ has rdev->sb set.
3227 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3229 char b[BDEVNAME_SIZE];
3231 struct md_rdev *rdev;
3234 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3236 return ERR_PTR(-ENOMEM);
3238 err = md_rdev_init(rdev);
3241 err = alloc_disk_sb(rdev);
3245 err = lock_rdev(rdev, newdev, super_format == -2);
3249 kobject_init(&rdev->kobj, &rdev_ktype);
3251 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3253 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3254 bdevname(rdev->bdev,b));
3259 if (super_format >= 0) {
3260 err = super_types[super_format].
3261 load_super(rdev, NULL, super_minor);
3262 if (err == -EINVAL) {
3263 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3264 bdevname(rdev->bdev,b),
3265 super_format, super_minor);
3269 pr_warn("md: could not read %s's sb, not importing!\n",
3270 bdevname(rdev->bdev,b));
3280 md_rdev_clear(rdev);
3282 return ERR_PTR(err);
3286 * Check a full RAID array for plausibility
3289 static void analyze_sbs(struct mddev *mddev)
3292 struct md_rdev *rdev, *freshest, *tmp;
3293 char b[BDEVNAME_SIZE];
3296 rdev_for_each_safe(rdev, tmp, mddev)
3297 switch (super_types[mddev->major_version].
3298 load_super(rdev, freshest, mddev->minor_version)) {
3305 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3306 bdevname(rdev->bdev,b));
3307 md_kick_rdev_from_array(rdev);
3310 super_types[mddev->major_version].
3311 validate_super(mddev, freshest);
3314 rdev_for_each_safe(rdev, tmp, mddev) {
3315 if (mddev->max_disks &&
3316 (rdev->desc_nr >= mddev->max_disks ||
3317 i > mddev->max_disks)) {
3318 pr_warn("md: %s: %s: only %d devices permitted\n",
3319 mdname(mddev), bdevname(rdev->bdev, b),
3321 md_kick_rdev_from_array(rdev);
3324 if (rdev != freshest) {
3325 if (super_types[mddev->major_version].
3326 validate_super(mddev, rdev)) {
3327 pr_warn("md: kicking non-fresh %s from array!\n",
3328 bdevname(rdev->bdev,b));
3329 md_kick_rdev_from_array(rdev);
3333 if (mddev->level == LEVEL_MULTIPATH) {
3334 rdev->desc_nr = i++;
3335 rdev->raid_disk = rdev->desc_nr;
3336 set_bit(In_sync, &rdev->flags);
3337 } else if (rdev->raid_disk >=
3338 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3339 !test_bit(Journal, &rdev->flags)) {
3340 rdev->raid_disk = -1;
3341 clear_bit(In_sync, &rdev->flags);
3346 /* Read a fixed-point number.
3347 * Numbers in sysfs attributes should be in "standard" units where
3348 * possible, so time should be in seconds.
3349 * However we internally use a a much smaller unit such as
3350 * milliseconds or jiffies.
3351 * This function takes a decimal number with a possible fractional
3352 * component, and produces an integer which is the result of
3353 * multiplying that number by 10^'scale'.
3354 * all without any floating-point arithmetic.
3356 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3358 unsigned long result = 0;
3360 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3363 else if (decimals < scale) {
3366 result = result * 10 + value;
3378 while (decimals < scale) {
3387 safe_delay_show(struct mddev *mddev, char *page)
3389 int msec = (mddev->safemode_delay*1000)/HZ;
3390 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3393 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3397 if (mddev_is_clustered(mddev)) {
3398 pr_warn("md: Safemode is disabled for clustered mode\n");
3402 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3405 mddev->safemode_delay = 0;
3407 unsigned long old_delay = mddev->safemode_delay;
3408 unsigned long new_delay = (msec*HZ)/1000;
3412 mddev->safemode_delay = new_delay;
3413 if (new_delay < old_delay || old_delay == 0)
3414 mod_timer(&mddev->safemode_timer, jiffies+1);
3418 static struct md_sysfs_entry md_safe_delay =
3419 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3422 level_show(struct mddev *mddev, char *page)
3424 struct md_personality *p;
3426 spin_lock(&mddev->lock);
3429 ret = sprintf(page, "%s\n", p->name);
3430 else if (mddev->clevel[0])
3431 ret = sprintf(page, "%s\n", mddev->clevel);
3432 else if (mddev->level != LEVEL_NONE)
3433 ret = sprintf(page, "%d\n", mddev->level);
3436 spin_unlock(&mddev->lock);
3441 level_store(struct mddev *mddev, const char *buf, size_t len)
3446 struct md_personality *pers, *oldpers;
3448 void *priv, *oldpriv;
3449 struct md_rdev *rdev;
3451 if (slen == 0 || slen >= sizeof(clevel))
3454 rv = mddev_lock(mddev);
3458 if (mddev->pers == NULL) {
3459 strncpy(mddev->clevel, buf, slen);
3460 if (mddev->clevel[slen-1] == '\n')
3462 mddev->clevel[slen] = 0;
3463 mddev->level = LEVEL_NONE;
3471 /* request to change the personality. Need to ensure:
3472 * - array is not engaged in resync/recovery/reshape
3473 * - old personality can be suspended
3474 * - new personality will access other array.
3478 if (mddev->sync_thread ||
3479 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3480 mddev->reshape_position != MaxSector ||
3481 mddev->sysfs_active)
3485 if (!mddev->pers->quiesce) {
3486 pr_warn("md: %s: %s does not support online personality change\n",
3487 mdname(mddev), mddev->pers->name);
3491 /* Now find the new personality */
3492 strncpy(clevel, buf, slen);
3493 if (clevel[slen-1] == '\n')
3496 if (kstrtol(clevel, 10, &level))
3499 if (request_module("md-%s", clevel) != 0)
3500 request_module("md-level-%s", clevel);
3501 spin_lock(&pers_lock);
3502 pers = find_pers(level, clevel);
3503 if (!pers || !try_module_get(pers->owner)) {
3504 spin_unlock(&pers_lock);
3505 pr_warn("md: personality %s not loaded\n", clevel);
3509 spin_unlock(&pers_lock);
3511 if (pers == mddev->pers) {
3512 /* Nothing to do! */
3513 module_put(pers->owner);
3517 if (!pers->takeover) {
3518 module_put(pers->owner);
3519 pr_warn("md: %s: %s does not support personality takeover\n",
3520 mdname(mddev), clevel);
3525 rdev_for_each(rdev, mddev)
3526 rdev->new_raid_disk = rdev->raid_disk;
3528 /* ->takeover must set new_* and/or delta_disks
3529 * if it succeeds, and may set them when it fails.
3531 priv = pers->takeover(mddev);
3533 mddev->new_level = mddev->level;
3534 mddev->new_layout = mddev->layout;
3535 mddev->new_chunk_sectors = mddev->chunk_sectors;
3536 mddev->raid_disks -= mddev->delta_disks;
3537 mddev->delta_disks = 0;
3538 mddev->reshape_backwards = 0;
3539 module_put(pers->owner);
3540 pr_warn("md: %s: %s would not accept array\n",
3541 mdname(mddev), clevel);
3546 /* Looks like we have a winner */
3547 mddev_suspend(mddev);
3548 mddev_detach(mddev);
3550 spin_lock(&mddev->lock);
3551 oldpers = mddev->pers;
3552 oldpriv = mddev->private;
3554 mddev->private = priv;
3555 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3556 mddev->level = mddev->new_level;
3557 mddev->layout = mddev->new_layout;
3558 mddev->chunk_sectors = mddev->new_chunk_sectors;
3559 mddev->delta_disks = 0;
3560 mddev->reshape_backwards = 0;
3561 mddev->degraded = 0;
3562 spin_unlock(&mddev->lock);
3564 if (oldpers->sync_request == NULL &&
3566 /* We are converting from a no-redundancy array
3567 * to a redundancy array and metadata is managed
3568 * externally so we need to be sure that writes
3569 * won't block due to a need to transition
3571 * until external management is started.
3574 mddev->safemode_delay = 0;
3575 mddev->safemode = 0;
3578 oldpers->free(mddev, oldpriv);
3580 if (oldpers->sync_request == NULL &&
3581 pers->sync_request != NULL) {
3582 /* need to add the md_redundancy_group */
3583 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3584 pr_warn("md: cannot register extra attributes for %s\n",
3586 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3588 if (oldpers->sync_request != NULL &&
3589 pers->sync_request == NULL) {
3590 /* need to remove the md_redundancy_group */
3591 if (mddev->to_remove == NULL)
3592 mddev->to_remove = &md_redundancy_group;
3595 module_put(oldpers->owner);
3597 rdev_for_each(rdev, mddev) {
3598 if (rdev->raid_disk < 0)
3600 if (rdev->new_raid_disk >= mddev->raid_disks)
3601 rdev->new_raid_disk = -1;
3602 if (rdev->new_raid_disk == rdev->raid_disk)
3604 sysfs_unlink_rdev(mddev, rdev);
3606 rdev_for_each(rdev, mddev) {
3607 if (rdev->raid_disk < 0)
3609 if (rdev->new_raid_disk == rdev->raid_disk)
3611 rdev->raid_disk = rdev->new_raid_disk;
3612 if (rdev->raid_disk < 0)
3613 clear_bit(In_sync, &rdev->flags);
3615 if (sysfs_link_rdev(mddev, rdev))
3616 pr_warn("md: cannot register rd%d for %s after level change\n",
3617 rdev->raid_disk, mdname(mddev));
3621 if (pers->sync_request == NULL) {
3622 /* this is now an array without redundancy, so
3623 * it must always be in_sync
3626 del_timer_sync(&mddev->safemode_timer);
3628 blk_set_stacking_limits(&mddev->queue->limits);
3630 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3631 mddev_resume(mddev);
3633 md_update_sb(mddev, 1);
3634 sysfs_notify(&mddev->kobj, NULL, "level");
3635 md_new_event(mddev);
3638 mddev_unlock(mddev);
3642 static struct md_sysfs_entry md_level =
3643 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3646 layout_show(struct mddev *mddev, char *page)
3648 /* just a number, not meaningful for all levels */
3649 if (mddev->reshape_position != MaxSector &&
3650 mddev->layout != mddev->new_layout)
3651 return sprintf(page, "%d (%d)\n",
3652 mddev->new_layout, mddev->layout);
3653 return sprintf(page, "%d\n", mddev->layout);
3657 layout_store(struct mddev *mddev, const char *buf, size_t len)
3662 err = kstrtouint(buf, 10, &n);
3665 err = mddev_lock(mddev);
3670 if (mddev->pers->check_reshape == NULL)
3675 mddev->new_layout = n;
3676 err = mddev->pers->check_reshape(mddev);
3678 mddev->new_layout = mddev->layout;
3681 mddev->new_layout = n;
3682 if (mddev->reshape_position == MaxSector)
3685 mddev_unlock(mddev);
3688 static struct md_sysfs_entry md_layout =
3689 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3692 raid_disks_show(struct mddev *mddev, char *page)
3694 if (mddev->raid_disks == 0)
3696 if (mddev->reshape_position != MaxSector &&
3697 mddev->delta_disks != 0)
3698 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3699 mddev->raid_disks - mddev->delta_disks);
3700 return sprintf(page, "%d\n", mddev->raid_disks);
3703 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3706 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3711 err = kstrtouint(buf, 10, &n);
3715 err = mddev_lock(mddev);
3719 err = update_raid_disks(mddev, n);
3720 else if (mddev->reshape_position != MaxSector) {
3721 struct md_rdev *rdev;
3722 int olddisks = mddev->raid_disks - mddev->delta_disks;
3725 rdev_for_each(rdev, mddev) {
3727 rdev->data_offset < rdev->new_data_offset)
3730 rdev->data_offset > rdev->new_data_offset)
3734 mddev->delta_disks = n - olddisks;
3735 mddev->raid_disks = n;
3736 mddev->reshape_backwards = (mddev->delta_disks < 0);
3738 mddev->raid_disks = n;
3740 mddev_unlock(mddev);
3741 return err ? err : len;
3743 static struct md_sysfs_entry md_raid_disks =
3744 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3747 chunk_size_show(struct mddev *mddev, char *page)
3749 if (mddev->reshape_position != MaxSector &&
3750 mddev->chunk_sectors != mddev->new_chunk_sectors)
3751 return sprintf(page, "%d (%d)\n",
3752 mddev->new_chunk_sectors << 9,
3753 mddev->chunk_sectors << 9);
3754 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3758 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3763 err = kstrtoul(buf, 10, &n);
3767 err = mddev_lock(mddev);
3771 if (mddev->pers->check_reshape == NULL)
3776 mddev->new_chunk_sectors = n >> 9;
3777 err = mddev->pers->check_reshape(mddev);
3779 mddev->new_chunk_sectors = mddev->chunk_sectors;
3782 mddev->new_chunk_sectors = n >> 9;
3783 if (mddev->reshape_position == MaxSector)
3784 mddev->chunk_sectors = n >> 9;
3786 mddev_unlock(mddev);
3789 static struct md_sysfs_entry md_chunk_size =
3790 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3793 resync_start_show(struct mddev *mddev, char *page)
3795 if (mddev->recovery_cp == MaxSector)
3796 return sprintf(page, "none\n");
3797 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3801 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3803 unsigned long long n;
3806 if (cmd_match(buf, "none"))
3809 err = kstrtoull(buf, 10, &n);
3812 if (n != (sector_t)n)
3816 err = mddev_lock(mddev);
3819 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3823 mddev->recovery_cp = n;
3825 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3827 mddev_unlock(mddev);
3830 static struct md_sysfs_entry md_resync_start =
3831 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3832 resync_start_show, resync_start_store);
3835 * The array state can be:
3838 * No devices, no size, no level
3839 * Equivalent to STOP_ARRAY ioctl
3841 * May have some settings, but array is not active
3842 * all IO results in error
3843 * When written, doesn't tear down array, but just stops it
3844 * suspended (not supported yet)
3845 * All IO requests will block. The array can be reconfigured.
3846 * Writing this, if accepted, will block until array is quiescent
3848 * no resync can happen. no superblocks get written.
3849 * write requests fail
3851 * like readonly, but behaves like 'clean' on a write request.
3853 * clean - no pending writes, but otherwise active.
3854 * When written to inactive array, starts without resync
3855 * If a write request arrives then
3856 * if metadata is known, mark 'dirty' and switch to 'active'.
3857 * if not known, block and switch to write-pending
3858 * If written to an active array that has pending writes, then fails.
3860 * fully active: IO and resync can be happening.
3861 * When written to inactive array, starts with resync
3864 * clean, but writes are blocked waiting for 'active' to be written.
3867 * like active, but no writes have been seen for a while (100msec).
3870 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3871 write_pending, active_idle, bad_word};
3872 static char *array_states[] = {
3873 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3874 "write-pending", "active-idle", NULL };
3876 static int match_word(const char *word, char **list)
3879 for (n=0; list[n]; n++)
3880 if (cmd_match(word, list[n]))
3886 array_state_show(struct mddev *mddev, char *page)
3888 enum array_state st = inactive;
3899 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3901 else if (mddev->in_sync)
3903 else if (mddev->safemode)
3909 if (list_empty(&mddev->disks) &&
3910 mddev->raid_disks == 0 &&
3911 mddev->dev_sectors == 0)
3916 return sprintf(page, "%s\n", array_states[st]);
3919 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3920 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3921 static int do_md_run(struct mddev *mddev);
3922 static int restart_array(struct mddev *mddev);
3925 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3928 enum array_state st = match_word(buf, array_states);
3930 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3931 /* don't take reconfig_mutex when toggling between
3934 spin_lock(&mddev->lock);
3936 restart_array(mddev);
3937 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3938 md_wakeup_thread(mddev->thread);
3939 wake_up(&mddev->sb_wait);
3941 } else /* st == clean */ {
3942 restart_array(mddev);
3943 if (atomic_read(&mddev->writes_pending) == 0) {
3944 if (mddev->in_sync == 0) {
3946 if (mddev->safemode == 1)
3947 mddev->safemode = 0;
3948 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3955 sysfs_notify_dirent_safe(mddev->sysfs_state);
3956 spin_unlock(&mddev->lock);
3959 err = mddev_lock(mddev);
3967 /* stopping an active array */
3968 err = do_md_stop(mddev, 0, NULL);
3971 /* stopping an active array */
3973 err = do_md_stop(mddev, 2, NULL);
3975 err = 0; /* already inactive */
3978 break; /* not supported yet */
3981 err = md_set_readonly(mddev, NULL);
3984 set_disk_ro(mddev->gendisk, 1);
3985 err = do_md_run(mddev);
3991 err = md_set_readonly(mddev, NULL);
3992 else if (mddev->ro == 1)
3993 err = restart_array(mddev);
3996 set_disk_ro(mddev->gendisk, 0);
4000 err = do_md_run(mddev);
4005 err = restart_array(mddev);
4008 spin_lock(&mddev->lock);
4009 if (atomic_read(&mddev->writes_pending) == 0) {
4010 if (mddev->in_sync == 0) {
4012 if (mddev->safemode == 1)
4013 mddev->safemode = 0;
4014 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
4019 spin_unlock(&mddev->lock);
4025 err = restart_array(mddev);
4028 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4029 wake_up(&mddev->sb_wait);
4033 set_disk_ro(mddev->gendisk, 0);
4034 err = do_md_run(mddev);
4039 /* these cannot be set */
4044 if (mddev->hold_active == UNTIL_IOCTL)
4045 mddev->hold_active = 0;
4046 sysfs_notify_dirent_safe(mddev->sysfs_state);
4048 mddev_unlock(mddev);
4051 static struct md_sysfs_entry md_array_state =
4052 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4055 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4056 return sprintf(page, "%d\n",
4057 atomic_read(&mddev->max_corr_read_errors));
4061 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4066 rv = kstrtouint(buf, 10, &n);
4069 atomic_set(&mddev->max_corr_read_errors, n);
4073 static struct md_sysfs_entry max_corr_read_errors =
4074 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4075 max_corrected_read_errors_store);
4078 null_show(struct mddev *mddev, char *page)
4084 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4086 /* buf must be %d:%d\n? giving major and minor numbers */
4087 /* The new device is added to the array.
4088 * If the array has a persistent superblock, we read the
4089 * superblock to initialise info and check validity.
4090 * Otherwise, only checking done is that in bind_rdev_to_array,
4091 * which mainly checks size.
4094 int major = simple_strtoul(buf, &e, 10);
4097 struct md_rdev *rdev;
4100 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4102 minor = simple_strtoul(e+1, &e, 10);
4103 if (*e && *e != '\n')
4105 dev = MKDEV(major, minor);
4106 if (major != MAJOR(dev) ||
4107 minor != MINOR(dev))
4110 flush_workqueue(md_misc_wq);
4112 err = mddev_lock(mddev);
4115 if (mddev->persistent) {
4116 rdev = md_import_device(dev, mddev->major_version,
4117 mddev->minor_version);
4118 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4119 struct md_rdev *rdev0
4120 = list_entry(mddev->disks.next,
4121 struct md_rdev, same_set);
4122 err = super_types[mddev->major_version]
4123 .load_super(rdev, rdev0, mddev->minor_version);
4127 } else if (mddev->external)
4128 rdev = md_import_device(dev, -2, -1);
4130 rdev = md_import_device(dev, -1, -1);
4133 mddev_unlock(mddev);
4134 return PTR_ERR(rdev);
4136 err = bind_rdev_to_array(rdev, mddev);
4140 mddev_unlock(mddev);
4141 return err ? err : len;
4144 static struct md_sysfs_entry md_new_device =
4145 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4148 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4151 unsigned long chunk, end_chunk;
4154 err = mddev_lock(mddev);
4159 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4161 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4162 if (buf == end) break;
4163 if (*end == '-') { /* range */
4165 end_chunk = simple_strtoul(buf, &end, 0);
4166 if (buf == end) break;
4168 if (*end && !isspace(*end)) break;
4169 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4170 buf = skip_spaces(end);
4172 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4174 mddev_unlock(mddev);
4178 static struct md_sysfs_entry md_bitmap =
4179 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4182 size_show(struct mddev *mddev, char *page)
4184 return sprintf(page, "%llu\n",
4185 (unsigned long long)mddev->dev_sectors / 2);
4188 static int update_size(struct mddev *mddev, sector_t num_sectors);
4191 size_store(struct mddev *mddev, const char *buf, size_t len)
4193 /* If array is inactive, we can reduce the component size, but
4194 * not increase it (except from 0).
4195 * If array is active, we can try an on-line resize
4198 int err = strict_blocks_to_sectors(buf, §ors);
4202 err = mddev_lock(mddev);
4206 err = update_size(mddev, sectors);
4208 md_update_sb(mddev, 1);
4210 if (mddev->dev_sectors == 0 ||
4211 mddev->dev_sectors > sectors)
4212 mddev->dev_sectors = sectors;
4216 mddev_unlock(mddev);
4217 return err ? err : len;
4220 static struct md_sysfs_entry md_size =
4221 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4223 /* Metadata version.
4225 * 'none' for arrays with no metadata (good luck...)
4226 * 'external' for arrays with externally managed metadata,
4227 * or N.M for internally known formats
4230 metadata_show(struct mddev *mddev, char *page)
4232 if (mddev->persistent)
4233 return sprintf(page, "%d.%d\n",
4234 mddev->major_version, mddev->minor_version);
4235 else if (mddev->external)
4236 return sprintf(page, "external:%s\n", mddev->metadata_type);
4238 return sprintf(page, "none\n");
4242 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4247 /* Changing the details of 'external' metadata is
4248 * always permitted. Otherwise there must be
4249 * no devices attached to the array.
4252 err = mddev_lock(mddev);
4256 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4258 else if (!list_empty(&mddev->disks))
4262 if (cmd_match(buf, "none")) {
4263 mddev->persistent = 0;
4264 mddev->external = 0;
4265 mddev->major_version = 0;
4266 mddev->minor_version = 90;
4269 if (strncmp(buf, "external:", 9) == 0) {
4270 size_t namelen = len-9;
4271 if (namelen >= sizeof(mddev->metadata_type))
4272 namelen = sizeof(mddev->metadata_type)-1;
4273 strncpy(mddev->metadata_type, buf+9, namelen);
4274 mddev->metadata_type[namelen] = 0;
4275 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4276 mddev->metadata_type[--namelen] = 0;
4277 mddev->persistent = 0;
4278 mddev->external = 1;
4279 mddev->major_version = 0;
4280 mddev->minor_version = 90;
4283 major = simple_strtoul(buf, &e, 10);
4285 if (e==buf || *e != '.')
4288 minor = simple_strtoul(buf, &e, 10);
4289 if (e==buf || (*e && *e != '\n') )
4292 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4294 mddev->major_version = major;
4295 mddev->minor_version = minor;
4296 mddev->persistent = 1;
4297 mddev->external = 0;
4300 mddev_unlock(mddev);
4304 static struct md_sysfs_entry md_metadata =
4305 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4308 action_show(struct mddev *mddev, char *page)
4310 char *type = "idle";
4311 unsigned long recovery = mddev->recovery;
4312 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4314 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4315 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4316 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4318 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4319 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4321 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4325 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4327 else if (mddev->reshape_position != MaxSector)
4330 return sprintf(page, "%s\n", type);
4334 action_store(struct mddev *mddev, const char *page, size_t len)
4336 if (!mddev->pers || !mddev->pers->sync_request)
4340 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4341 if (cmd_match(page, "frozen"))
4342 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4344 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4345 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4346 mddev_lock(mddev) == 0) {
4347 flush_workqueue(md_misc_wq);
4348 if (mddev->sync_thread) {
4349 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4350 md_reap_sync_thread(mddev);
4352 mddev_unlock(mddev);
4354 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4356 else if (cmd_match(page, "resync"))
4357 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4358 else if (cmd_match(page, "recover")) {
4359 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4360 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4361 } else if (cmd_match(page, "reshape")) {
4363 if (mddev->pers->start_reshape == NULL)
4365 err = mddev_lock(mddev);
4367 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4370 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4371 err = mddev->pers->start_reshape(mddev);
4373 mddev_unlock(mddev);
4377 sysfs_notify(&mddev->kobj, NULL, "degraded");
4379 if (cmd_match(page, "check"))
4380 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4381 else if (!cmd_match(page, "repair"))
4383 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4384 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4385 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4387 if (mddev->ro == 2) {
4388 /* A write to sync_action is enough to justify
4389 * canceling read-auto mode
4392 md_wakeup_thread(mddev->sync_thread);
4394 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4395 md_wakeup_thread(mddev->thread);
4396 sysfs_notify_dirent_safe(mddev->sysfs_action);
4400 static struct md_sysfs_entry md_scan_mode =
4401 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4404 last_sync_action_show(struct mddev *mddev, char *page)
4406 return sprintf(page, "%s\n", mddev->last_sync_action);
4409 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4412 mismatch_cnt_show(struct mddev *mddev, char *page)
4414 return sprintf(page, "%llu\n",
4415 (unsigned long long)
4416 atomic64_read(&mddev->resync_mismatches));
4419 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4422 sync_min_show(struct mddev *mddev, char *page)
4424 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4425 mddev->sync_speed_min ? "local": "system");
4429 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4434 if (strncmp(buf, "system", 6)==0) {
4437 rv = kstrtouint(buf, 10, &min);
4443 mddev->sync_speed_min = min;
4447 static struct md_sysfs_entry md_sync_min =
4448 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4451 sync_max_show(struct mddev *mddev, char *page)
4453 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4454 mddev->sync_speed_max ? "local": "system");
4458 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4463 if (strncmp(buf, "system", 6)==0) {
4466 rv = kstrtouint(buf, 10, &max);
4472 mddev->sync_speed_max = max;
4476 static struct md_sysfs_entry md_sync_max =
4477 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4480 degraded_show(struct mddev *mddev, char *page)
4482 return sprintf(page, "%d\n", mddev->degraded);
4484 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4487 sync_force_parallel_show(struct mddev *mddev, char *page)
4489 return sprintf(page, "%d\n", mddev->parallel_resync);
4493 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4497 if (kstrtol(buf, 10, &n))
4500 if (n != 0 && n != 1)
4503 mddev->parallel_resync = n;
4505 if (mddev->sync_thread)
4506 wake_up(&resync_wait);
4511 /* force parallel resync, even with shared block devices */
4512 static struct md_sysfs_entry md_sync_force_parallel =
4513 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4514 sync_force_parallel_show, sync_force_parallel_store);
4517 sync_speed_show(struct mddev *mddev, char *page)
4519 unsigned long resync, dt, db;
4520 if (mddev->curr_resync == 0)
4521 return sprintf(page, "none\n");
4522 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4523 dt = (jiffies - mddev->resync_mark) / HZ;
4525 db = resync - mddev->resync_mark_cnt;
4526 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4529 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4532 sync_completed_show(struct mddev *mddev, char *page)
4534 unsigned long long max_sectors, resync;
4536 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4537 return sprintf(page, "none\n");
4539 if (mddev->curr_resync == 1 ||
4540 mddev->curr_resync == 2)
4541 return sprintf(page, "delayed\n");
4543 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4544 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4545 max_sectors = mddev->resync_max_sectors;
4547 max_sectors = mddev->dev_sectors;
4549 resync = mddev->curr_resync_completed;
4550 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4553 static struct md_sysfs_entry md_sync_completed =
4554 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4557 min_sync_show(struct mddev *mddev, char *page)
4559 return sprintf(page, "%llu\n",
4560 (unsigned long long)mddev->resync_min);
4563 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4565 unsigned long long min;
4568 if (kstrtoull(buf, 10, &min))
4571 spin_lock(&mddev->lock);
4573 if (min > mddev->resync_max)
4577 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4580 /* Round down to multiple of 4K for safety */
4581 mddev->resync_min = round_down(min, 8);
4585 spin_unlock(&mddev->lock);
4589 static struct md_sysfs_entry md_min_sync =
4590 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4593 max_sync_show(struct mddev *mddev, char *page)
4595 if (mddev->resync_max == MaxSector)
4596 return sprintf(page, "max\n");
4598 return sprintf(page, "%llu\n",
4599 (unsigned long long)mddev->resync_max);
4602 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4605 spin_lock(&mddev->lock);
4606 if (strncmp(buf, "max", 3) == 0)
4607 mddev->resync_max = MaxSector;
4609 unsigned long long max;
4613 if (kstrtoull(buf, 10, &max))
4615 if (max < mddev->resync_min)
4619 if (max < mddev->resync_max &&
4621 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4624 /* Must be a multiple of chunk_size */
4625 chunk = mddev->chunk_sectors;
4627 sector_t temp = max;
4630 if (sector_div(temp, chunk))
4633 mddev->resync_max = max;
4635 wake_up(&mddev->recovery_wait);
4638 spin_unlock(&mddev->lock);
4642 static struct md_sysfs_entry md_max_sync =
4643 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4646 suspend_lo_show(struct mddev *mddev, char *page)
4648 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4652 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4654 unsigned long long old, new;
4657 err = kstrtoull(buf, 10, &new);
4660 if (new != (sector_t)new)
4663 err = mddev_lock(mddev);
4667 if (mddev->pers == NULL ||
4668 mddev->pers->quiesce == NULL)
4670 old = mddev->suspend_lo;
4671 mddev->suspend_lo = new;
4673 /* Shrinking suspended region */
4674 mddev->pers->quiesce(mddev, 2);
4676 /* Expanding suspended region - need to wait */
4677 mddev->pers->quiesce(mddev, 1);
4678 mddev->pers->quiesce(mddev, 0);
4682 mddev_unlock(mddev);
4685 static struct md_sysfs_entry md_suspend_lo =
4686 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4689 suspend_hi_show(struct mddev *mddev, char *page)
4691 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4695 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4697 unsigned long long old, new;
4700 err = kstrtoull(buf, 10, &new);
4703 if (new != (sector_t)new)
4706 err = mddev_lock(mddev);
4710 if (mddev->pers == NULL ||
4711 mddev->pers->quiesce == NULL)
4713 old = mddev->suspend_hi;
4714 mddev->suspend_hi = new;
4716 /* Shrinking suspended region */
4717 mddev->pers->quiesce(mddev, 2);
4719 /* Expanding suspended region - need to wait */
4720 mddev->pers->quiesce(mddev, 1);
4721 mddev->pers->quiesce(mddev, 0);
4725 mddev_unlock(mddev);
4728 static struct md_sysfs_entry md_suspend_hi =
4729 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4732 reshape_position_show(struct mddev *mddev, char *page)
4734 if (mddev->reshape_position != MaxSector)
4735 return sprintf(page, "%llu\n",
4736 (unsigned long long)mddev->reshape_position);
4737 strcpy(page, "none\n");
4742 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4744 struct md_rdev *rdev;
4745 unsigned long long new;
4748 err = kstrtoull(buf, 10, &new);
4751 if (new != (sector_t)new)
4753 err = mddev_lock(mddev);
4759 mddev->reshape_position = new;
4760 mddev->delta_disks = 0;
4761 mddev->reshape_backwards = 0;
4762 mddev->new_level = mddev->level;
4763 mddev->new_layout = mddev->layout;
4764 mddev->new_chunk_sectors = mddev->chunk_sectors;
4765 rdev_for_each(rdev, mddev)
4766 rdev->new_data_offset = rdev->data_offset;
4769 mddev_unlock(mddev);
4773 static struct md_sysfs_entry md_reshape_position =
4774 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4775 reshape_position_store);
4778 reshape_direction_show(struct mddev *mddev, char *page)
4780 return sprintf(page, "%s\n",
4781 mddev->reshape_backwards ? "backwards" : "forwards");
4785 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4790 if (cmd_match(buf, "forwards"))
4792 else if (cmd_match(buf, "backwards"))
4796 if (mddev->reshape_backwards == backwards)
4799 err = mddev_lock(mddev);
4802 /* check if we are allowed to change */
4803 if (mddev->delta_disks)
4805 else if (mddev->persistent &&
4806 mddev->major_version == 0)
4809 mddev->reshape_backwards = backwards;
4810 mddev_unlock(mddev);
4814 static struct md_sysfs_entry md_reshape_direction =
4815 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4816 reshape_direction_store);
4819 array_size_show(struct mddev *mddev, char *page)
4821 if (mddev->external_size)
4822 return sprintf(page, "%llu\n",
4823 (unsigned long long)mddev->array_sectors/2);
4825 return sprintf(page, "default\n");
4829 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4834 err = mddev_lock(mddev);
4838 /* cluster raid doesn't support change array_sectors */
4839 if (mddev_is_clustered(mddev))
4842 if (strncmp(buf, "default", 7) == 0) {
4844 sectors = mddev->pers->size(mddev, 0, 0);
4846 sectors = mddev->array_sectors;
4848 mddev->external_size = 0;
4850 if (strict_blocks_to_sectors(buf, §ors) < 0)
4852 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4855 mddev->external_size = 1;
4859 mddev->array_sectors = sectors;
4861 set_capacity(mddev->gendisk, mddev->array_sectors);
4862 revalidate_disk(mddev->gendisk);
4865 mddev_unlock(mddev);
4869 static struct md_sysfs_entry md_array_size =
4870 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4873 static struct attribute *md_default_attrs[] = {
4876 &md_raid_disks.attr,
4877 &md_chunk_size.attr,
4879 &md_resync_start.attr,
4881 &md_new_device.attr,
4882 &md_safe_delay.attr,
4883 &md_array_state.attr,
4884 &md_reshape_position.attr,
4885 &md_reshape_direction.attr,
4886 &md_array_size.attr,
4887 &max_corr_read_errors.attr,
4891 static struct attribute *md_redundancy_attrs[] = {
4893 &md_last_scan_mode.attr,
4894 &md_mismatches.attr,
4897 &md_sync_speed.attr,
4898 &md_sync_force_parallel.attr,
4899 &md_sync_completed.attr,
4902 &md_suspend_lo.attr,
4903 &md_suspend_hi.attr,
4908 static struct attribute_group md_redundancy_group = {
4910 .attrs = md_redundancy_attrs,
4914 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4916 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4917 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4922 spin_lock(&all_mddevs_lock);
4923 if (list_empty(&mddev->all_mddevs)) {
4924 spin_unlock(&all_mddevs_lock);
4928 spin_unlock(&all_mddevs_lock);
4930 rv = entry->show(mddev, page);
4936 md_attr_store(struct kobject *kobj, struct attribute *attr,
4937 const char *page, size_t length)
4939 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4940 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4945 if (!capable(CAP_SYS_ADMIN))
4947 spin_lock(&all_mddevs_lock);
4948 if (list_empty(&mddev->all_mddevs)) {
4949 spin_unlock(&all_mddevs_lock);
4953 spin_unlock(&all_mddevs_lock);
4954 rv = entry->store(mddev, page, length);
4959 static void md_free(struct kobject *ko)
4961 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4963 if (mddev->sysfs_state)
4964 sysfs_put(mddev->sysfs_state);
4967 blk_cleanup_queue(mddev->queue);
4968 if (mddev->gendisk) {
4969 del_gendisk(mddev->gendisk);
4970 put_disk(mddev->gendisk);
4976 static const struct sysfs_ops md_sysfs_ops = {
4977 .show = md_attr_show,
4978 .store = md_attr_store,
4980 static struct kobj_type md_ktype = {
4982 .sysfs_ops = &md_sysfs_ops,
4983 .default_attrs = md_default_attrs,
4988 static void mddev_delayed_delete(struct work_struct *ws)
4990 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4992 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4993 kobject_del(&mddev->kobj);
4994 kobject_put(&mddev->kobj);
4997 static int md_alloc(dev_t dev, char *name)
4999 static DEFINE_MUTEX(disks_mutex);
5000 struct mddev *mddev = mddev_find(dev);
5001 struct gendisk *disk;
5010 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5011 shift = partitioned ? MdpMinorShift : 0;
5012 unit = MINOR(mddev->unit) >> shift;
5014 /* wait for any previous instance of this device to be
5015 * completely removed (mddev_delayed_delete).
5017 flush_workqueue(md_misc_wq);
5019 mutex_lock(&disks_mutex);
5025 /* Need to ensure that 'name' is not a duplicate.
5027 struct mddev *mddev2;
5028 spin_lock(&all_mddevs_lock);
5030 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5031 if (mddev2->gendisk &&
5032 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5033 spin_unlock(&all_mddevs_lock);
5036 spin_unlock(&all_mddevs_lock);
5040 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5043 mddev->queue->queuedata = mddev;
5045 blk_queue_make_request(mddev->queue, md_make_request);
5046 blk_set_stacking_limits(&mddev->queue->limits);
5048 disk = alloc_disk(1 << shift);
5050 blk_cleanup_queue(mddev->queue);
5051 mddev->queue = NULL;
5054 disk->major = MAJOR(mddev->unit);
5055 disk->first_minor = unit << shift;
5057 strcpy(disk->disk_name, name);
5058 else if (partitioned)
5059 sprintf(disk->disk_name, "md_d%d", unit);
5061 sprintf(disk->disk_name, "md%d", unit);
5062 disk->fops = &md_fops;
5063 disk->private_data = mddev;
5064 disk->queue = mddev->queue;
5065 blk_queue_write_cache(mddev->queue, true, true);
5066 /* Allow extended partitions. This makes the
5067 * 'mdp' device redundant, but we can't really
5070 disk->flags |= GENHD_FL_EXT_DEVT;
5071 mddev->gendisk = disk;
5072 /* As soon as we call add_disk(), another thread could get
5073 * through to md_open, so make sure it doesn't get too far
5075 mutex_lock(&mddev->open_mutex);
5078 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5079 &disk_to_dev(disk)->kobj, "%s", "md");
5081 /* This isn't possible, but as kobject_init_and_add is marked
5082 * __must_check, we must do something with the result
5084 pr_debug("md: cannot register %s/md - name in use\n",
5088 if (mddev->kobj.sd &&
5089 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5090 pr_debug("pointless warning\n");
5091 mutex_unlock(&mddev->open_mutex);
5093 mutex_unlock(&disks_mutex);
5094 if (!error && mddev->kobj.sd) {
5095 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5096 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5102 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5104 md_alloc(dev, NULL);
5108 static int add_named_array(const char *val, struct kernel_param *kp)
5110 /* val must be "md_*" where * is not all digits.
5111 * We allocate an array with a large free minor number, and
5112 * set the name to val. val must not already be an active name.
5114 int len = strlen(val);
5115 char buf[DISK_NAME_LEN];
5117 while (len && val[len-1] == '\n')
5119 if (len >= DISK_NAME_LEN)
5121 strlcpy(buf, val, len+1);
5122 if (strncmp(buf, "md_", 3) != 0)
5124 return md_alloc(0, buf);
5127 static void md_safemode_timeout(unsigned long data)
5129 struct mddev *mddev = (struct mddev *) data;
5131 if (!atomic_read(&mddev->writes_pending)) {
5132 mddev->safemode = 1;
5133 if (mddev->external)
5134 sysfs_notify_dirent_safe(mddev->sysfs_state);
5136 md_wakeup_thread(mddev->thread);
5139 static int start_dirty_degraded;
5141 int md_run(struct mddev *mddev)
5144 struct md_rdev *rdev;
5145 struct md_personality *pers;
5147 if (list_empty(&mddev->disks))
5148 /* cannot run an array with no devices.. */
5153 /* Cannot run until previous stop completes properly */
5154 if (mddev->sysfs_active)
5158 * Analyze all RAID superblock(s)
5160 if (!mddev->raid_disks) {
5161 if (!mddev->persistent)
5166 if (mddev->level != LEVEL_NONE)
5167 request_module("md-level-%d", mddev->level);
5168 else if (mddev->clevel[0])
5169 request_module("md-%s", mddev->clevel);
5172 * Drop all container device buffers, from now on
5173 * the only valid external interface is through the md
5176 rdev_for_each(rdev, mddev) {
5177 if (test_bit(Faulty, &rdev->flags))
5179 sync_blockdev(rdev->bdev);
5180 invalidate_bdev(rdev->bdev);
5182 /* perform some consistency tests on the device.
5183 * We don't want the data to overlap the metadata,
5184 * Internal Bitmap issues have been handled elsewhere.
5186 if (rdev->meta_bdev) {
5187 /* Nothing to check */;
5188 } else if (rdev->data_offset < rdev->sb_start) {
5189 if (mddev->dev_sectors &&
5190 rdev->data_offset + mddev->dev_sectors
5192 pr_warn("md: %s: data overlaps metadata\n",
5197 if (rdev->sb_start + rdev->sb_size/512
5198 > rdev->data_offset) {
5199 pr_warn("md: %s: metadata overlaps data\n",
5204 sysfs_notify_dirent_safe(rdev->sysfs_state);
5207 if (mddev->bio_set == NULL)
5208 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5210 spin_lock(&pers_lock);
5211 pers = find_pers(mddev->level, mddev->clevel);
5212 if (!pers || !try_module_get(pers->owner)) {
5213 spin_unlock(&pers_lock);
5214 if (mddev->level != LEVEL_NONE)
5215 pr_warn("md: personality for level %d is not loaded!\n",
5218 pr_warn("md: personality for level %s is not loaded!\n",
5222 spin_unlock(&pers_lock);
5223 if (mddev->level != pers->level) {
5224 mddev->level = pers->level;
5225 mddev->new_level = pers->level;
5227 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5229 if (mddev->reshape_position != MaxSector &&
5230 pers->start_reshape == NULL) {
5231 /* This personality cannot handle reshaping... */
5232 module_put(pers->owner);
5236 if (pers->sync_request) {
5237 /* Warn if this is a potentially silly
5240 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5241 struct md_rdev *rdev2;
5244 rdev_for_each(rdev, mddev)
5245 rdev_for_each(rdev2, mddev) {
5247 rdev->bdev->bd_contains ==
5248 rdev2->bdev->bd_contains) {
5249 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5251 bdevname(rdev->bdev,b),
5252 bdevname(rdev2->bdev,b2));
5258 pr_warn("True protection against single-disk failure might be compromised.\n");
5261 mddev->recovery = 0;
5262 /* may be over-ridden by personality */
5263 mddev->resync_max_sectors = mddev->dev_sectors;
5265 mddev->ok_start_degraded = start_dirty_degraded;
5267 if (start_readonly && mddev->ro == 0)
5268 mddev->ro = 2; /* read-only, but switch on first write */
5270 err = pers->run(mddev);
5272 pr_warn("md: pers->run() failed ...\n");
5273 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5274 WARN_ONCE(!mddev->external_size,
5275 "%s: default size too small, but 'external_size' not in effect?\n",
5277 pr_warn("md: invalid array_size %llu > default size %llu\n",
5278 (unsigned long long)mddev->array_sectors / 2,
5279 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5282 if (err == 0 && pers->sync_request &&
5283 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5284 struct bitmap *bitmap;
5286 bitmap = bitmap_create(mddev, -1);
5287 if (IS_ERR(bitmap)) {
5288 err = PTR_ERR(bitmap);
5289 pr_warn("%s: failed to create bitmap (%d)\n",
5290 mdname(mddev), err);
5292 mddev->bitmap = bitmap;
5296 mddev_detach(mddev);
5298 pers->free(mddev, mddev->private);
5299 mddev->private = NULL;
5300 module_put(pers->owner);
5301 bitmap_destroy(mddev);
5307 rdev_for_each(rdev, mddev) {
5308 if (rdev->raid_disk >= 0 &&
5309 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5314 if (mddev->degraded)
5317 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5319 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5320 mddev->queue->backing_dev_info.congested_data = mddev;
5321 mddev->queue->backing_dev_info.congested_fn = md_congested;
5323 if (pers->sync_request) {
5324 if (mddev->kobj.sd &&
5325 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5326 pr_warn("md: cannot register extra attributes for %s\n",
5328 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5329 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5332 atomic_set(&mddev->writes_pending,0);
5333 atomic_set(&mddev->max_corr_read_errors,
5334 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5335 mddev->safemode = 0;
5336 if (mddev_is_clustered(mddev))
5337 mddev->safemode_delay = 0;
5339 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5342 spin_lock(&mddev->lock);
5344 spin_unlock(&mddev->lock);
5345 rdev_for_each(rdev, mddev)
5346 if (rdev->raid_disk >= 0)
5347 if (sysfs_link_rdev(mddev, rdev))
5348 /* failure here is OK */;
5350 if (mddev->degraded && !mddev->ro)
5351 /* This ensures that recovering status is reported immediately
5352 * via sysfs - until a lack of spares is confirmed.
5354 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5355 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5357 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5358 md_update_sb(mddev, 0);
5360 md_new_event(mddev);
5361 sysfs_notify_dirent_safe(mddev->sysfs_state);
5362 sysfs_notify_dirent_safe(mddev->sysfs_action);
5363 sysfs_notify(&mddev->kobj, NULL, "degraded");
5366 EXPORT_SYMBOL_GPL(md_run);
5368 static int do_md_run(struct mddev *mddev)
5372 err = md_run(mddev);
5375 err = bitmap_load(mddev);
5377 bitmap_destroy(mddev);
5381 if (mddev_is_clustered(mddev))
5382 md_allow_write(mddev);
5384 md_wakeup_thread(mddev->thread);
5385 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5387 set_capacity(mddev->gendisk, mddev->array_sectors);
5388 revalidate_disk(mddev->gendisk);
5390 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5395 static int restart_array(struct mddev *mddev)
5397 struct gendisk *disk = mddev->gendisk;
5399 /* Complain if it has no devices */
5400 if (list_empty(&mddev->disks))
5406 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5407 struct md_rdev *rdev;
5408 bool has_journal = false;
5411 rdev_for_each_rcu(rdev, mddev) {
5412 if (test_bit(Journal, &rdev->flags) &&
5413 !test_bit(Faulty, &rdev->flags)) {
5420 /* Don't restart rw with journal missing/faulty */
5425 mddev->safemode = 0;
5427 set_disk_ro(disk, 0);
5428 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5429 /* Kick recovery or resync if necessary */
5430 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5431 md_wakeup_thread(mddev->thread);
5432 md_wakeup_thread(mddev->sync_thread);
5433 sysfs_notify_dirent_safe(mddev->sysfs_state);
5437 static void md_clean(struct mddev *mddev)
5439 mddev->array_sectors = 0;
5440 mddev->external_size = 0;
5441 mddev->dev_sectors = 0;
5442 mddev->raid_disks = 0;
5443 mddev->recovery_cp = 0;
5444 mddev->resync_min = 0;
5445 mddev->resync_max = MaxSector;
5446 mddev->reshape_position = MaxSector;
5447 mddev->external = 0;
5448 mddev->persistent = 0;
5449 mddev->level = LEVEL_NONE;
5450 mddev->clevel[0] = 0;
5453 mddev->metadata_type[0] = 0;
5454 mddev->chunk_sectors = 0;
5455 mddev->ctime = mddev->utime = 0;
5457 mddev->max_disks = 0;
5459 mddev->can_decrease_events = 0;
5460 mddev->delta_disks = 0;
5461 mddev->reshape_backwards = 0;
5462 mddev->new_level = LEVEL_NONE;
5463 mddev->new_layout = 0;
5464 mddev->new_chunk_sectors = 0;
5465 mddev->curr_resync = 0;
5466 atomic64_set(&mddev->resync_mismatches, 0);
5467 mddev->suspend_lo = mddev->suspend_hi = 0;
5468 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5469 mddev->recovery = 0;
5472 mddev->degraded = 0;
5473 mddev->safemode = 0;
5474 mddev->private = NULL;
5475 mddev->cluster_info = NULL;
5476 mddev->bitmap_info.offset = 0;
5477 mddev->bitmap_info.default_offset = 0;
5478 mddev->bitmap_info.default_space = 0;
5479 mddev->bitmap_info.chunksize = 0;
5480 mddev->bitmap_info.daemon_sleep = 0;
5481 mddev->bitmap_info.max_write_behind = 0;
5482 mddev->bitmap_info.nodes = 0;
5485 static void __md_stop_writes(struct mddev *mddev)
5487 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5488 flush_workqueue(md_misc_wq);
5489 if (mddev->sync_thread) {
5490 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5491 md_reap_sync_thread(mddev);
5494 del_timer_sync(&mddev->safemode_timer);
5496 bitmap_flush(mddev);
5498 if (mddev->ro == 0 &&
5499 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5500 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5501 /* mark array as shutdown cleanly */
5502 if (!mddev_is_clustered(mddev))
5504 md_update_sb(mddev, 1);
5508 void md_stop_writes(struct mddev *mddev)
5510 mddev_lock_nointr(mddev);
5511 __md_stop_writes(mddev);
5512 mddev_unlock(mddev);
5514 EXPORT_SYMBOL_GPL(md_stop_writes);
5516 static void mddev_detach(struct mddev *mddev)
5518 struct bitmap *bitmap = mddev->bitmap;
5519 /* wait for behind writes to complete */
5520 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5521 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
5523 /* need to kick something here to make sure I/O goes? */
5524 wait_event(bitmap->behind_wait,
5525 atomic_read(&bitmap->behind_writes) == 0);
5527 if (mddev->pers && mddev->pers->quiesce) {
5528 mddev->pers->quiesce(mddev, 1);
5529 mddev->pers->quiesce(mddev, 0);
5531 md_unregister_thread(&mddev->thread);
5533 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5536 static void __md_stop(struct mddev *mddev)
5538 struct md_personality *pers = mddev->pers;
5539 mddev_detach(mddev);
5540 /* Ensure ->event_work is done */
5541 flush_workqueue(md_misc_wq);
5542 spin_lock(&mddev->lock);
5544 spin_unlock(&mddev->lock);
5545 pers->free(mddev, mddev->private);
5546 mddev->private = NULL;
5547 if (pers->sync_request && mddev->to_remove == NULL)
5548 mddev->to_remove = &md_redundancy_group;
5549 module_put(pers->owner);
5550 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5553 void md_stop(struct mddev *mddev)
5555 /* stop the array and free an attached data structures.
5556 * This is called from dm-raid
5559 bitmap_destroy(mddev);
5561 bioset_free(mddev->bio_set);
5564 EXPORT_SYMBOL_GPL(md_stop);
5566 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5571 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5573 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5574 md_wakeup_thread(mddev->thread);
5576 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5577 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5578 if (mddev->sync_thread)
5579 /* Thread might be blocked waiting for metadata update
5580 * which will now never happen */
5581 wake_up_process(mddev->sync_thread->tsk);
5583 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5585 mddev_unlock(mddev);
5586 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5588 wait_event(mddev->sb_wait,
5589 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5590 mddev_lock_nointr(mddev);
5592 mutex_lock(&mddev->open_mutex);
5593 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5594 mddev->sync_thread ||
5595 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5596 pr_warn("md: %s still in use.\n",mdname(mddev));
5598 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5599 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5600 md_wakeup_thread(mddev->thread);
5606 __md_stop_writes(mddev);
5612 set_disk_ro(mddev->gendisk, 1);
5613 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5614 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5615 md_wakeup_thread(mddev->thread);
5616 sysfs_notify_dirent_safe(mddev->sysfs_state);
5620 mutex_unlock(&mddev->open_mutex);
5625 * 0 - completely stop and dis-assemble array
5626 * 2 - stop but do not disassemble array
5628 static int do_md_stop(struct mddev *mddev, int mode,
5629 struct block_device *bdev)
5631 struct gendisk *disk = mddev->gendisk;
5632 struct md_rdev *rdev;
5635 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5637 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5638 md_wakeup_thread(mddev->thread);
5640 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5641 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5642 if (mddev->sync_thread)
5643 /* Thread might be blocked waiting for metadata update
5644 * which will now never happen */
5645 wake_up_process(mddev->sync_thread->tsk);
5647 mddev_unlock(mddev);
5648 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5649 !test_bit(MD_RECOVERY_RUNNING,
5650 &mddev->recovery)));
5651 mddev_lock_nointr(mddev);
5653 mutex_lock(&mddev->open_mutex);
5654 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5655 mddev->sysfs_active ||
5656 mddev->sync_thread ||
5657 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5658 pr_warn("md: %s still in use.\n",mdname(mddev));
5659 mutex_unlock(&mddev->open_mutex);
5661 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5662 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5663 md_wakeup_thread(mddev->thread);
5669 set_disk_ro(disk, 0);
5671 __md_stop_writes(mddev);
5673 mddev->queue->backing_dev_info.congested_fn = NULL;
5675 /* tell userspace to handle 'inactive' */
5676 sysfs_notify_dirent_safe(mddev->sysfs_state);
5678 rdev_for_each(rdev, mddev)
5679 if (rdev->raid_disk >= 0)
5680 sysfs_unlink_rdev(mddev, rdev);
5682 set_capacity(disk, 0);
5683 mutex_unlock(&mddev->open_mutex);
5685 revalidate_disk(disk);
5690 mutex_unlock(&mddev->open_mutex);
5692 * Free resources if final stop
5695 pr_info("md: %s stopped.\n", mdname(mddev));
5697 bitmap_destroy(mddev);
5698 if (mddev->bitmap_info.file) {
5699 struct file *f = mddev->bitmap_info.file;
5700 spin_lock(&mddev->lock);
5701 mddev->bitmap_info.file = NULL;
5702 spin_unlock(&mddev->lock);
5705 mddev->bitmap_info.offset = 0;
5707 export_array(mddev);
5710 if (mddev->hold_active == UNTIL_STOP)
5711 mddev->hold_active = 0;
5713 md_new_event(mddev);
5714 sysfs_notify_dirent_safe(mddev->sysfs_state);
5719 static void autorun_array(struct mddev *mddev)
5721 struct md_rdev *rdev;
5724 if (list_empty(&mddev->disks))
5727 pr_info("md: running: ");
5729 rdev_for_each(rdev, mddev) {
5730 char b[BDEVNAME_SIZE];
5731 pr_cont("<%s>", bdevname(rdev->bdev,b));
5735 err = do_md_run(mddev);
5737 pr_warn("md: do_md_run() returned %d\n", err);
5738 do_md_stop(mddev, 0, NULL);
5743 * lets try to run arrays based on all disks that have arrived
5744 * until now. (those are in pending_raid_disks)
5746 * the method: pick the first pending disk, collect all disks with
5747 * the same UUID, remove all from the pending list and put them into
5748 * the 'same_array' list. Then order this list based on superblock
5749 * update time (freshest comes first), kick out 'old' disks and
5750 * compare superblocks. If everything's fine then run it.
5752 * If "unit" is allocated, then bump its reference count
5754 static void autorun_devices(int part)
5756 struct md_rdev *rdev0, *rdev, *tmp;
5757 struct mddev *mddev;
5758 char b[BDEVNAME_SIZE];
5760 pr_info("md: autorun ...\n");
5761 while (!list_empty(&pending_raid_disks)) {
5764 LIST_HEAD(candidates);
5765 rdev0 = list_entry(pending_raid_disks.next,
5766 struct md_rdev, same_set);
5768 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
5769 INIT_LIST_HEAD(&candidates);
5770 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5771 if (super_90_load(rdev, rdev0, 0) >= 0) {
5772 pr_debug("md: adding %s ...\n",
5773 bdevname(rdev->bdev,b));
5774 list_move(&rdev->same_set, &candidates);
5777 * now we have a set of devices, with all of them having
5778 * mostly sane superblocks. It's time to allocate the
5782 dev = MKDEV(mdp_major,
5783 rdev0->preferred_minor << MdpMinorShift);
5784 unit = MINOR(dev) >> MdpMinorShift;
5786 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5789 if (rdev0->preferred_minor != unit) {
5790 pr_warn("md: unit number in %s is bad: %d\n",
5791 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5795 md_probe(dev, NULL, NULL);
5796 mddev = mddev_find(dev);
5797 if (!mddev || !mddev->gendisk) {
5802 if (mddev_lock(mddev))
5803 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
5804 else if (mddev->raid_disks || mddev->major_version
5805 || !list_empty(&mddev->disks)) {
5806 pr_warn("md: %s already running, cannot run %s\n",
5807 mdname(mddev), bdevname(rdev0->bdev,b));
5808 mddev_unlock(mddev);
5810 pr_debug("md: created %s\n", mdname(mddev));
5811 mddev->persistent = 1;
5812 rdev_for_each_list(rdev, tmp, &candidates) {
5813 list_del_init(&rdev->same_set);
5814 if (bind_rdev_to_array(rdev, mddev))
5817 autorun_array(mddev);
5818 mddev_unlock(mddev);
5820 /* on success, candidates will be empty, on error
5823 rdev_for_each_list(rdev, tmp, &candidates) {
5824 list_del_init(&rdev->same_set);
5829 pr_info("md: ... autorun DONE.\n");
5831 #endif /* !MODULE */
5833 static int get_version(void __user *arg)
5837 ver.major = MD_MAJOR_VERSION;
5838 ver.minor = MD_MINOR_VERSION;
5839 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5841 if (copy_to_user(arg, &ver, sizeof(ver)))
5847 static int get_array_info(struct mddev *mddev, void __user *arg)
5849 mdu_array_info_t info;
5850 int nr,working,insync,failed,spare;
5851 struct md_rdev *rdev;
5853 nr = working = insync = failed = spare = 0;
5855 rdev_for_each_rcu(rdev, mddev) {
5857 if (test_bit(Faulty, &rdev->flags))
5861 if (test_bit(In_sync, &rdev->flags))
5863 else if (test_bit(Journal, &rdev->flags))
5864 /* TODO: add journal count to md_u.h */
5872 info.major_version = mddev->major_version;
5873 info.minor_version = mddev->minor_version;
5874 info.patch_version = MD_PATCHLEVEL_VERSION;
5875 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
5876 info.level = mddev->level;
5877 info.size = mddev->dev_sectors / 2;
5878 if (info.size != mddev->dev_sectors / 2) /* overflow */
5881 info.raid_disks = mddev->raid_disks;
5882 info.md_minor = mddev->md_minor;
5883 info.not_persistent= !mddev->persistent;
5885 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
5888 info.state = (1<<MD_SB_CLEAN);
5889 if (mddev->bitmap && mddev->bitmap_info.offset)
5890 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5891 if (mddev_is_clustered(mddev))
5892 info.state |= (1<<MD_SB_CLUSTERED);
5893 info.active_disks = insync;
5894 info.working_disks = working;
5895 info.failed_disks = failed;
5896 info.spare_disks = spare;
5898 info.layout = mddev->layout;
5899 info.chunk_size = mddev->chunk_sectors << 9;
5901 if (copy_to_user(arg, &info, sizeof(info)))
5907 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5909 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5913 file = kzalloc(sizeof(*file), GFP_NOIO);
5918 spin_lock(&mddev->lock);
5919 /* bitmap enabled */
5920 if (mddev->bitmap_info.file) {
5921 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5922 sizeof(file->pathname));
5926 memmove(file->pathname, ptr,
5927 sizeof(file->pathname)-(ptr-file->pathname));
5929 spin_unlock(&mddev->lock);
5932 copy_to_user(arg, file, sizeof(*file)))
5939 static int get_disk_info(struct mddev *mddev, void __user * arg)
5941 mdu_disk_info_t info;
5942 struct md_rdev *rdev;
5944 if (copy_from_user(&info, arg, sizeof(info)))
5948 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5950 info.major = MAJOR(rdev->bdev->bd_dev);
5951 info.minor = MINOR(rdev->bdev->bd_dev);
5952 info.raid_disk = rdev->raid_disk;
5954 if (test_bit(Faulty, &rdev->flags))
5955 info.state |= (1<<MD_DISK_FAULTY);
5956 else if (test_bit(In_sync, &rdev->flags)) {
5957 info.state |= (1<<MD_DISK_ACTIVE);
5958 info.state |= (1<<MD_DISK_SYNC);
5960 if (test_bit(Journal, &rdev->flags))
5961 info.state |= (1<<MD_DISK_JOURNAL);
5962 if (test_bit(WriteMostly, &rdev->flags))
5963 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5964 if (test_bit(FailFast, &rdev->flags))
5965 info.state |= (1<<MD_DISK_FAILFAST);
5967 info.major = info.minor = 0;
5968 info.raid_disk = -1;
5969 info.state = (1<<MD_DISK_REMOVED);
5973 if (copy_to_user(arg, &info, sizeof(info)))
5979 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5981 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5982 struct md_rdev *rdev;
5983 dev_t dev = MKDEV(info->major,info->minor);
5985 if (mddev_is_clustered(mddev) &&
5986 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5987 pr_warn("%s: Cannot add to clustered mddev.\n",
5992 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5995 if (!mddev->raid_disks) {
5997 /* expecting a device which has a superblock */
5998 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6000 pr_warn("md: md_import_device returned %ld\n",
6002 return PTR_ERR(rdev);
6004 if (!list_empty(&mddev->disks)) {
6005 struct md_rdev *rdev0
6006 = list_entry(mddev->disks.next,
6007 struct md_rdev, same_set);
6008 err = super_types[mddev->major_version]
6009 .load_super(rdev, rdev0, mddev->minor_version);
6011 pr_warn("md: %s has different UUID to %s\n",
6012 bdevname(rdev->bdev,b),
6013 bdevname(rdev0->bdev,b2));
6018 err = bind_rdev_to_array(rdev, mddev);
6025 * add_new_disk can be used once the array is assembled
6026 * to add "hot spares". They must already have a superblock
6031 if (!mddev->pers->hot_add_disk) {
6032 pr_warn("%s: personality does not support diskops!\n",
6036 if (mddev->persistent)
6037 rdev = md_import_device(dev, mddev->major_version,
6038 mddev->minor_version);
6040 rdev = md_import_device(dev, -1, -1);
6042 pr_warn("md: md_import_device returned %ld\n",
6044 return PTR_ERR(rdev);
6046 /* set saved_raid_disk if appropriate */
6047 if (!mddev->persistent) {
6048 if (info->state & (1<<MD_DISK_SYNC) &&
6049 info->raid_disk < mddev->raid_disks) {
6050 rdev->raid_disk = info->raid_disk;
6051 set_bit(In_sync, &rdev->flags);
6052 clear_bit(Bitmap_sync, &rdev->flags);
6054 rdev->raid_disk = -1;
6055 rdev->saved_raid_disk = rdev->raid_disk;
6057 super_types[mddev->major_version].
6058 validate_super(mddev, rdev);
6059 if ((info->state & (1<<MD_DISK_SYNC)) &&
6060 rdev->raid_disk != info->raid_disk) {
6061 /* This was a hot-add request, but events doesn't
6062 * match, so reject it.
6068 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6069 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6070 set_bit(WriteMostly, &rdev->flags);
6072 clear_bit(WriteMostly, &rdev->flags);
6073 if (info->state & (1<<MD_DISK_FAILFAST))
6074 set_bit(FailFast, &rdev->flags);
6076 clear_bit(FailFast, &rdev->flags);
6078 if (info->state & (1<<MD_DISK_JOURNAL)) {
6079 struct md_rdev *rdev2;
6080 bool has_journal = false;
6082 /* make sure no existing journal disk */
6083 rdev_for_each(rdev2, mddev) {
6084 if (test_bit(Journal, &rdev2->flags)) {
6093 set_bit(Journal, &rdev->flags);
6096 * check whether the device shows up in other nodes
6098 if (mddev_is_clustered(mddev)) {
6099 if (info->state & (1 << MD_DISK_CANDIDATE))
6100 set_bit(Candidate, &rdev->flags);
6101 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6102 /* --add initiated by this node */
6103 err = md_cluster_ops->add_new_disk(mddev, rdev);
6111 rdev->raid_disk = -1;
6112 err = bind_rdev_to_array(rdev, mddev);
6117 if (mddev_is_clustered(mddev)) {
6118 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6120 err = md_cluster_ops->new_disk_ack(mddev,
6123 md_kick_rdev_from_array(rdev);
6127 md_cluster_ops->add_new_disk_cancel(mddev);
6129 err = add_bound_rdev(rdev);
6133 err = add_bound_rdev(rdev);
6138 /* otherwise, add_new_disk is only allowed
6139 * for major_version==0 superblocks
6141 if (mddev->major_version != 0) {
6142 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6146 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6148 rdev = md_import_device(dev, -1, 0);
6150 pr_warn("md: error, md_import_device() returned %ld\n",
6152 return PTR_ERR(rdev);
6154 rdev->desc_nr = info->number;
6155 if (info->raid_disk < mddev->raid_disks)
6156 rdev->raid_disk = info->raid_disk;
6158 rdev->raid_disk = -1;
6160 if (rdev->raid_disk < mddev->raid_disks)
6161 if (info->state & (1<<MD_DISK_SYNC))
6162 set_bit(In_sync, &rdev->flags);
6164 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6165 set_bit(WriteMostly, &rdev->flags);
6166 if (info->state & (1<<MD_DISK_FAILFAST))
6167 set_bit(FailFast, &rdev->flags);
6169 if (!mddev->persistent) {
6170 pr_debug("md: nonpersistent superblock ...\n");
6171 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6173 rdev->sb_start = calc_dev_sboffset(rdev);
6174 rdev->sectors = rdev->sb_start;
6176 err = bind_rdev_to_array(rdev, mddev);
6186 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6188 char b[BDEVNAME_SIZE];
6189 struct md_rdev *rdev;
6191 rdev = find_rdev(mddev, dev);
6195 if (rdev->raid_disk < 0)
6198 clear_bit(Blocked, &rdev->flags);
6199 remove_and_add_spares(mddev, rdev);
6201 if (rdev->raid_disk >= 0)
6205 if (mddev_is_clustered(mddev))
6206 md_cluster_ops->remove_disk(mddev, rdev);
6208 md_kick_rdev_from_array(rdev);
6209 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6211 md_wakeup_thread(mddev->thread);
6213 md_update_sb(mddev, 1);
6214 md_new_event(mddev);
6218 pr_debug("md: cannot remove active disk %s from %s ...\n",
6219 bdevname(rdev->bdev,b), mdname(mddev));
6223 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6225 char b[BDEVNAME_SIZE];
6227 struct md_rdev *rdev;
6232 if (mddev->major_version != 0) {
6233 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6237 if (!mddev->pers->hot_add_disk) {
6238 pr_warn("%s: personality does not support diskops!\n",
6243 rdev = md_import_device(dev, -1, 0);
6245 pr_warn("md: error, md_import_device() returned %ld\n",
6250 if (mddev->persistent)
6251 rdev->sb_start = calc_dev_sboffset(rdev);
6253 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6255 rdev->sectors = rdev->sb_start;
6257 if (test_bit(Faulty, &rdev->flags)) {
6258 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6259 bdevname(rdev->bdev,b), mdname(mddev));
6264 clear_bit(In_sync, &rdev->flags);
6266 rdev->saved_raid_disk = -1;
6267 err = bind_rdev_to_array(rdev, mddev);
6272 * The rest should better be atomic, we can have disk failures
6273 * noticed in interrupt contexts ...
6276 rdev->raid_disk = -1;
6278 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6280 md_update_sb(mddev, 1);
6282 * Kick recovery, maybe this spare has to be added to the
6283 * array immediately.
6285 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6286 md_wakeup_thread(mddev->thread);
6287 md_new_event(mddev);
6295 static int set_bitmap_file(struct mddev *mddev, int fd)
6300 if (!mddev->pers->quiesce || !mddev->thread)
6302 if (mddev->recovery || mddev->sync_thread)
6304 /* we should be able to change the bitmap.. */
6308 struct inode *inode;
6311 if (mddev->bitmap || mddev->bitmap_info.file)
6312 return -EEXIST; /* cannot add when bitmap is present */
6316 pr_warn("%s: error: failed to get bitmap file\n",
6321 inode = f->f_mapping->host;
6322 if (!S_ISREG(inode->i_mode)) {
6323 pr_warn("%s: error: bitmap file must be a regular file\n",
6326 } else if (!(f->f_mode & FMODE_WRITE)) {
6327 pr_warn("%s: error: bitmap file must open for write\n",
6330 } else if (atomic_read(&inode->i_writecount) != 1) {
6331 pr_warn("%s: error: bitmap file is already in use\n",
6339 mddev->bitmap_info.file = f;
6340 mddev->bitmap_info.offset = 0; /* file overrides offset */
6341 } else if (mddev->bitmap == NULL)
6342 return -ENOENT; /* cannot remove what isn't there */
6345 mddev->pers->quiesce(mddev, 1);
6347 struct bitmap *bitmap;
6349 bitmap = bitmap_create(mddev, -1);
6350 if (!IS_ERR(bitmap)) {
6351 mddev->bitmap = bitmap;
6352 err = bitmap_load(mddev);
6354 err = PTR_ERR(bitmap);
6356 if (fd < 0 || err) {
6357 bitmap_destroy(mddev);
6358 fd = -1; /* make sure to put the file */
6360 mddev->pers->quiesce(mddev, 0);
6363 struct file *f = mddev->bitmap_info.file;
6365 spin_lock(&mddev->lock);
6366 mddev->bitmap_info.file = NULL;
6367 spin_unlock(&mddev->lock);
6376 * set_array_info is used two different ways
6377 * The original usage is when creating a new array.
6378 * In this usage, raid_disks is > 0 and it together with
6379 * level, size, not_persistent,layout,chunksize determine the
6380 * shape of the array.
6381 * This will always create an array with a type-0.90.0 superblock.
6382 * The newer usage is when assembling an array.
6383 * In this case raid_disks will be 0, and the major_version field is
6384 * use to determine which style super-blocks are to be found on the devices.
6385 * The minor and patch _version numbers are also kept incase the
6386 * super_block handler wishes to interpret them.
6388 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6391 if (info->raid_disks == 0) {
6392 /* just setting version number for superblock loading */
6393 if (info->major_version < 0 ||
6394 info->major_version >= ARRAY_SIZE(super_types) ||
6395 super_types[info->major_version].name == NULL) {
6396 /* maybe try to auto-load a module? */
6397 pr_warn("md: superblock version %d not known\n",
6398 info->major_version);
6401 mddev->major_version = info->major_version;
6402 mddev->minor_version = info->minor_version;
6403 mddev->patch_version = info->patch_version;
6404 mddev->persistent = !info->not_persistent;
6405 /* ensure mddev_put doesn't delete this now that there
6406 * is some minimal configuration.
6408 mddev->ctime = ktime_get_real_seconds();
6411 mddev->major_version = MD_MAJOR_VERSION;
6412 mddev->minor_version = MD_MINOR_VERSION;
6413 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6414 mddev->ctime = ktime_get_real_seconds();
6416 mddev->level = info->level;
6417 mddev->clevel[0] = 0;
6418 mddev->dev_sectors = 2 * (sector_t)info->size;
6419 mddev->raid_disks = info->raid_disks;
6420 /* don't set md_minor, it is determined by which /dev/md* was
6423 if (info->state & (1<<MD_SB_CLEAN))
6424 mddev->recovery_cp = MaxSector;
6426 mddev->recovery_cp = 0;
6427 mddev->persistent = ! info->not_persistent;
6428 mddev->external = 0;
6430 mddev->layout = info->layout;
6431 mddev->chunk_sectors = info->chunk_size >> 9;
6433 mddev->max_disks = MD_SB_DISKS;
6435 if (mddev->persistent)
6437 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6439 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6440 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6441 mddev->bitmap_info.offset = 0;
6443 mddev->reshape_position = MaxSector;
6446 * Generate a 128 bit UUID
6448 get_random_bytes(mddev->uuid, 16);
6450 mddev->new_level = mddev->level;
6451 mddev->new_chunk_sectors = mddev->chunk_sectors;
6452 mddev->new_layout = mddev->layout;
6453 mddev->delta_disks = 0;
6454 mddev->reshape_backwards = 0;
6459 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6461 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6463 if (mddev->external_size)
6466 mddev->array_sectors = array_sectors;
6468 EXPORT_SYMBOL(md_set_array_sectors);
6470 static int update_size(struct mddev *mddev, sector_t num_sectors)
6472 struct md_rdev *rdev;
6474 int fit = (num_sectors == 0);
6476 /* cluster raid doesn't support update size */
6477 if (mddev_is_clustered(mddev))
6480 if (mddev->pers->resize == NULL)
6482 /* The "num_sectors" is the number of sectors of each device that
6483 * is used. This can only make sense for arrays with redundancy.
6484 * linear and raid0 always use whatever space is available. We can only
6485 * consider changing this number if no resync or reconstruction is
6486 * happening, and if the new size is acceptable. It must fit before the
6487 * sb_start or, if that is <data_offset, it must fit before the size
6488 * of each device. If num_sectors is zero, we find the largest size
6491 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6497 rdev_for_each(rdev, mddev) {
6498 sector_t avail = rdev->sectors;
6500 if (fit && (num_sectors == 0 || num_sectors > avail))
6501 num_sectors = avail;
6502 if (avail < num_sectors)
6505 rv = mddev->pers->resize(mddev, num_sectors);
6507 revalidate_disk(mddev->gendisk);
6511 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6514 struct md_rdev *rdev;
6515 /* change the number of raid disks */
6516 if (mddev->pers->check_reshape == NULL)
6520 if (raid_disks <= 0 ||
6521 (mddev->max_disks && raid_disks >= mddev->max_disks))
6523 if (mddev->sync_thread ||
6524 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6525 mddev->reshape_position != MaxSector)
6528 rdev_for_each(rdev, mddev) {
6529 if (mddev->raid_disks < raid_disks &&
6530 rdev->data_offset < rdev->new_data_offset)
6532 if (mddev->raid_disks > raid_disks &&
6533 rdev->data_offset > rdev->new_data_offset)
6537 mddev->delta_disks = raid_disks - mddev->raid_disks;
6538 if (mddev->delta_disks < 0)
6539 mddev->reshape_backwards = 1;
6540 else if (mddev->delta_disks > 0)
6541 mddev->reshape_backwards = 0;
6543 rv = mddev->pers->check_reshape(mddev);
6545 mddev->delta_disks = 0;
6546 mddev->reshape_backwards = 0;
6552 * update_array_info is used to change the configuration of an
6554 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6555 * fields in the info are checked against the array.
6556 * Any differences that cannot be handled will cause an error.
6557 * Normally, only one change can be managed at a time.
6559 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6565 /* calculate expected state,ignoring low bits */
6566 if (mddev->bitmap && mddev->bitmap_info.offset)
6567 state |= (1 << MD_SB_BITMAP_PRESENT);
6569 if (mddev->major_version != info->major_version ||
6570 mddev->minor_version != info->minor_version ||
6571 /* mddev->patch_version != info->patch_version || */
6572 mddev->ctime != info->ctime ||
6573 mddev->level != info->level ||
6574 /* mddev->layout != info->layout || */
6575 mddev->persistent != !info->not_persistent ||
6576 mddev->chunk_sectors != info->chunk_size >> 9 ||
6577 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6578 ((state^info->state) & 0xfffffe00)
6581 /* Check there is only one change */
6582 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6584 if (mddev->raid_disks != info->raid_disks)
6586 if (mddev->layout != info->layout)
6588 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6595 if (mddev->layout != info->layout) {
6597 * we don't need to do anything at the md level, the
6598 * personality will take care of it all.
6600 if (mddev->pers->check_reshape == NULL)
6603 mddev->new_layout = info->layout;
6604 rv = mddev->pers->check_reshape(mddev);
6606 mddev->new_layout = mddev->layout;
6610 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6611 rv = update_size(mddev, (sector_t)info->size * 2);
6613 if (mddev->raid_disks != info->raid_disks)
6614 rv = update_raid_disks(mddev, info->raid_disks);
6616 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6617 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6621 if (mddev->recovery || mddev->sync_thread) {
6625 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6626 struct bitmap *bitmap;
6627 /* add the bitmap */
6628 if (mddev->bitmap) {
6632 if (mddev->bitmap_info.default_offset == 0) {
6636 mddev->bitmap_info.offset =
6637 mddev->bitmap_info.default_offset;
6638 mddev->bitmap_info.space =
6639 mddev->bitmap_info.default_space;
6640 mddev->pers->quiesce(mddev, 1);
6641 bitmap = bitmap_create(mddev, -1);
6642 if (!IS_ERR(bitmap)) {
6643 mddev->bitmap = bitmap;
6644 rv = bitmap_load(mddev);
6646 rv = PTR_ERR(bitmap);
6648 bitmap_destroy(mddev);
6649 mddev->pers->quiesce(mddev, 0);
6651 /* remove the bitmap */
6652 if (!mddev->bitmap) {
6656 if (mddev->bitmap->storage.file) {
6660 if (mddev->bitmap_info.nodes) {
6661 /* hold PW on all the bitmap lock */
6662 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6663 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6665 md_cluster_ops->unlock_all_bitmaps(mddev);
6669 mddev->bitmap_info.nodes = 0;
6670 md_cluster_ops->leave(mddev);
6672 mddev->pers->quiesce(mddev, 1);
6673 bitmap_destroy(mddev);
6674 mddev->pers->quiesce(mddev, 0);
6675 mddev->bitmap_info.offset = 0;
6678 md_update_sb(mddev, 1);
6684 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6686 struct md_rdev *rdev;
6689 if (mddev->pers == NULL)
6693 rdev = find_rdev_rcu(mddev, dev);
6697 md_error(mddev, rdev);
6698 if (!test_bit(Faulty, &rdev->flags))
6706 * We have a problem here : there is no easy way to give a CHS
6707 * virtual geometry. We currently pretend that we have a 2 heads
6708 * 4 sectors (with a BIG number of cylinders...). This drives
6709 * dosfs just mad... ;-)
6711 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6713 struct mddev *mddev = bdev->bd_disk->private_data;
6717 geo->cylinders = mddev->array_sectors / 8;
6721 static inline bool md_ioctl_valid(unsigned int cmd)
6726 case GET_ARRAY_INFO:
6727 case GET_BITMAP_FILE:
6730 case HOT_REMOVE_DISK:
6733 case RESTART_ARRAY_RW:
6735 case SET_ARRAY_INFO:
6736 case SET_BITMAP_FILE:
6737 case SET_DISK_FAULTY:
6740 case CLUSTERED_DISK_NACK:
6747 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6748 unsigned int cmd, unsigned long arg)
6751 void __user *argp = (void __user *)arg;
6752 struct mddev *mddev = NULL;
6755 if (!md_ioctl_valid(cmd))
6760 case GET_ARRAY_INFO:
6764 if (!capable(CAP_SYS_ADMIN))
6769 * Commands dealing with the RAID driver but not any
6774 err = get_version(argp);
6780 autostart_arrays(arg);
6787 * Commands creating/starting a new array:
6790 mddev = bdev->bd_disk->private_data;
6797 /* Some actions do not requires the mutex */
6799 case GET_ARRAY_INFO:
6800 if (!mddev->raid_disks && !mddev->external)
6803 err = get_array_info(mddev, argp);
6807 if (!mddev->raid_disks && !mddev->external)
6810 err = get_disk_info(mddev, argp);
6813 case SET_DISK_FAULTY:
6814 err = set_disk_faulty(mddev, new_decode_dev(arg));
6817 case GET_BITMAP_FILE:
6818 err = get_bitmap_file(mddev, argp);
6823 if (cmd == ADD_NEW_DISK)
6824 /* need to ensure md_delayed_delete() has completed */
6825 flush_workqueue(md_misc_wq);
6827 if (cmd == HOT_REMOVE_DISK)
6828 /* need to ensure recovery thread has run */
6829 wait_event_interruptible_timeout(mddev->sb_wait,
6830 !test_bit(MD_RECOVERY_NEEDED,
6832 msecs_to_jiffies(5000));
6833 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6834 /* Need to flush page cache, and ensure no-one else opens
6837 mutex_lock(&mddev->open_mutex);
6838 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6839 mutex_unlock(&mddev->open_mutex);
6843 set_bit(MD_CLOSING, &mddev->flags);
6844 mutex_unlock(&mddev->open_mutex);
6845 sync_blockdev(bdev);
6847 err = mddev_lock(mddev);
6849 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
6854 if (cmd == SET_ARRAY_INFO) {
6855 mdu_array_info_t info;
6857 memset(&info, 0, sizeof(info));
6858 else if (copy_from_user(&info, argp, sizeof(info))) {
6863 err = update_array_info(mddev, &info);
6865 pr_warn("md: couldn't update array info. %d\n", err);
6870 if (!list_empty(&mddev->disks)) {
6871 pr_warn("md: array %s already has disks!\n", mdname(mddev));
6875 if (mddev->raid_disks) {
6876 pr_warn("md: array %s already initialised!\n", mdname(mddev));
6880 err = set_array_info(mddev, &info);
6882 pr_warn("md: couldn't set array info. %d\n", err);
6889 * Commands querying/configuring an existing array:
6891 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6892 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6893 if ((!mddev->raid_disks && !mddev->external)
6894 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6895 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6896 && cmd != GET_BITMAP_FILE) {
6902 * Commands even a read-only array can execute:
6905 case RESTART_ARRAY_RW:
6906 err = restart_array(mddev);
6910 err = do_md_stop(mddev, 0, bdev);
6914 err = md_set_readonly(mddev, bdev);
6917 case HOT_REMOVE_DISK:
6918 err = hot_remove_disk(mddev, new_decode_dev(arg));
6922 /* We can support ADD_NEW_DISK on read-only arrays
6923 * only if we are re-adding a preexisting device.
6924 * So require mddev->pers and MD_DISK_SYNC.
6927 mdu_disk_info_t info;
6928 if (copy_from_user(&info, argp, sizeof(info)))
6930 else if (!(info.state & (1<<MD_DISK_SYNC)))
6931 /* Need to clear read-only for this */
6934 err = add_new_disk(mddev, &info);
6940 if (get_user(ro, (int __user *)(arg))) {
6946 /* if the bdev is going readonly the value of mddev->ro
6947 * does not matter, no writes are coming
6952 /* are we are already prepared for writes? */
6956 /* transitioning to readauto need only happen for
6957 * arrays that call md_write_start
6960 err = restart_array(mddev);
6963 set_disk_ro(mddev->gendisk, 0);
6970 * The remaining ioctls are changing the state of the
6971 * superblock, so we do not allow them on read-only arrays.
6973 if (mddev->ro && mddev->pers) {
6974 if (mddev->ro == 2) {
6976 sysfs_notify_dirent_safe(mddev->sysfs_state);
6977 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6978 /* mddev_unlock will wake thread */
6979 /* If a device failed while we were read-only, we
6980 * need to make sure the metadata is updated now.
6982 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6983 mddev_unlock(mddev);
6984 wait_event(mddev->sb_wait,
6985 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6986 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6987 mddev_lock_nointr(mddev);
6998 mdu_disk_info_t info;
6999 if (copy_from_user(&info, argp, sizeof(info)))
7002 err = add_new_disk(mddev, &info);
7006 case CLUSTERED_DISK_NACK:
7007 if (mddev_is_clustered(mddev))
7008 md_cluster_ops->new_disk_ack(mddev, false);
7014 err = hot_add_disk(mddev, new_decode_dev(arg));
7018 err = do_md_run(mddev);
7021 case SET_BITMAP_FILE:
7022 err = set_bitmap_file(mddev, (int)arg);
7031 if (mddev->hold_active == UNTIL_IOCTL &&
7033 mddev->hold_active = 0;
7034 mddev_unlock(mddev);
7038 #ifdef CONFIG_COMPAT
7039 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7040 unsigned int cmd, unsigned long arg)
7043 case HOT_REMOVE_DISK:
7045 case SET_DISK_FAULTY:
7046 case SET_BITMAP_FILE:
7047 /* These take in integer arg, do not convert */
7050 arg = (unsigned long)compat_ptr(arg);
7054 return md_ioctl(bdev, mode, cmd, arg);
7056 #endif /* CONFIG_COMPAT */
7058 static int md_open(struct block_device *bdev, fmode_t mode)
7061 * Succeed if we can lock the mddev, which confirms that
7062 * it isn't being stopped right now.
7064 struct mddev *mddev = mddev_find(bdev->bd_dev);
7070 if (mddev->gendisk != bdev->bd_disk) {
7071 /* we are racing with mddev_put which is discarding this
7075 /* Wait until bdev->bd_disk is definitely gone */
7076 flush_workqueue(md_misc_wq);
7077 /* Then retry the open from the top */
7078 return -ERESTARTSYS;
7080 BUG_ON(mddev != bdev->bd_disk->private_data);
7082 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7085 if (test_bit(MD_CLOSING, &mddev->flags)) {
7086 mutex_unlock(&mddev->open_mutex);
7091 atomic_inc(&mddev->openers);
7092 mutex_unlock(&mddev->open_mutex);
7094 check_disk_change(bdev);
7099 static void md_release(struct gendisk *disk, fmode_t mode)
7101 struct mddev *mddev = disk->private_data;
7104 atomic_dec(&mddev->openers);
7108 static int md_media_changed(struct gendisk *disk)
7110 struct mddev *mddev = disk->private_data;
7112 return mddev->changed;
7115 static int md_revalidate(struct gendisk *disk)
7117 struct mddev *mddev = disk->private_data;
7122 static const struct block_device_operations md_fops =
7124 .owner = THIS_MODULE,
7126 .release = md_release,
7128 #ifdef CONFIG_COMPAT
7129 .compat_ioctl = md_compat_ioctl,
7131 .getgeo = md_getgeo,
7132 .media_changed = md_media_changed,
7133 .revalidate_disk= md_revalidate,
7136 static int md_thread(void *arg)
7138 struct md_thread *thread = arg;
7141 * md_thread is a 'system-thread', it's priority should be very
7142 * high. We avoid resource deadlocks individually in each
7143 * raid personality. (RAID5 does preallocation) We also use RR and
7144 * the very same RT priority as kswapd, thus we will never get
7145 * into a priority inversion deadlock.
7147 * we definitely have to have equal or higher priority than
7148 * bdflush, otherwise bdflush will deadlock if there are too
7149 * many dirty RAID5 blocks.
7152 allow_signal(SIGKILL);
7153 while (!kthread_should_stop()) {
7155 /* We need to wait INTERRUPTIBLE so that
7156 * we don't add to the load-average.
7157 * That means we need to be sure no signals are
7160 if (signal_pending(current))
7161 flush_signals(current);
7163 wait_event_interruptible_timeout
7165 test_bit(THREAD_WAKEUP, &thread->flags)
7166 || kthread_should_stop(),
7169 clear_bit(THREAD_WAKEUP, &thread->flags);
7170 if (!kthread_should_stop())
7171 thread->run(thread);
7177 void md_wakeup_thread(struct md_thread *thread)
7180 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7181 set_bit(THREAD_WAKEUP, &thread->flags);
7182 wake_up(&thread->wqueue);
7185 EXPORT_SYMBOL(md_wakeup_thread);
7187 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7188 struct mddev *mddev, const char *name)
7190 struct md_thread *thread;
7192 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7196 init_waitqueue_head(&thread->wqueue);
7199 thread->mddev = mddev;
7200 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7201 thread->tsk = kthread_run(md_thread, thread,
7203 mdname(thread->mddev),
7205 if (IS_ERR(thread->tsk)) {
7211 EXPORT_SYMBOL(md_register_thread);
7213 void md_unregister_thread(struct md_thread **threadp)
7215 struct md_thread *thread = *threadp;
7218 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7219 /* Locking ensures that mddev_unlock does not wake_up a
7220 * non-existent thread
7222 spin_lock(&pers_lock);
7224 spin_unlock(&pers_lock);
7226 kthread_stop(thread->tsk);
7229 EXPORT_SYMBOL(md_unregister_thread);
7231 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7233 if (!rdev || test_bit(Faulty, &rdev->flags))
7236 if (!mddev->pers || !mddev->pers->error_handler)
7238 mddev->pers->error_handler(mddev,rdev);
7239 if (mddev->degraded)
7240 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7241 sysfs_notify_dirent_safe(rdev->sysfs_state);
7242 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7243 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7244 md_wakeup_thread(mddev->thread);
7245 if (mddev->event_work.func)
7246 queue_work(md_misc_wq, &mddev->event_work);
7247 md_new_event(mddev);
7249 EXPORT_SYMBOL(md_error);
7251 /* seq_file implementation /proc/mdstat */
7253 static void status_unused(struct seq_file *seq)
7256 struct md_rdev *rdev;
7258 seq_printf(seq, "unused devices: ");
7260 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7261 char b[BDEVNAME_SIZE];
7263 seq_printf(seq, "%s ",
7264 bdevname(rdev->bdev,b));
7267 seq_printf(seq, "<none>");
7269 seq_printf(seq, "\n");
7272 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7274 sector_t max_sectors, resync, res;
7275 unsigned long dt, db;
7278 unsigned int per_milli;
7280 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7281 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7282 max_sectors = mddev->resync_max_sectors;
7284 max_sectors = mddev->dev_sectors;
7286 resync = mddev->curr_resync;
7288 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7289 /* Still cleaning up */
7290 resync = max_sectors;
7292 resync -= atomic_read(&mddev->recovery_active);
7295 if (mddev->recovery_cp < MaxSector) {
7296 seq_printf(seq, "\tresync=PENDING");
7302 seq_printf(seq, "\tresync=DELAYED");
7306 WARN_ON(max_sectors == 0);
7307 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7308 * in a sector_t, and (max_sectors>>scale) will fit in a
7309 * u32, as those are the requirements for sector_div.
7310 * Thus 'scale' must be at least 10
7313 if (sizeof(sector_t) > sizeof(unsigned long)) {
7314 while ( max_sectors/2 > (1ULL<<(scale+32)))
7317 res = (resync>>scale)*1000;
7318 sector_div(res, (u32)((max_sectors>>scale)+1));
7322 int i, x = per_milli/50, y = 20-x;
7323 seq_printf(seq, "[");
7324 for (i = 0; i < x; i++)
7325 seq_printf(seq, "=");
7326 seq_printf(seq, ">");
7327 for (i = 0; i < y; i++)
7328 seq_printf(seq, ".");
7329 seq_printf(seq, "] ");
7331 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7332 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7334 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7336 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7337 "resync" : "recovery"))),
7338 per_milli/10, per_milli % 10,
7339 (unsigned long long) resync/2,
7340 (unsigned long long) max_sectors/2);
7343 * dt: time from mark until now
7344 * db: blocks written from mark until now
7345 * rt: remaining time
7347 * rt is a sector_t, so could be 32bit or 64bit.
7348 * So we divide before multiply in case it is 32bit and close
7350 * We scale the divisor (db) by 32 to avoid losing precision
7351 * near the end of resync when the number of remaining sectors
7353 * We then divide rt by 32 after multiplying by db to compensate.
7354 * The '+1' avoids division by zero if db is very small.
7356 dt = ((jiffies - mddev->resync_mark) / HZ);
7358 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7359 - mddev->resync_mark_cnt;
7361 rt = max_sectors - resync; /* number of remaining sectors */
7362 sector_div(rt, db/32+1);
7366 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7367 ((unsigned long)rt % 60)/6);
7369 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7373 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7375 struct list_head *tmp;
7377 struct mddev *mddev;
7385 spin_lock(&all_mddevs_lock);
7386 list_for_each(tmp,&all_mddevs)
7388 mddev = list_entry(tmp, struct mddev, all_mddevs);
7390 spin_unlock(&all_mddevs_lock);
7393 spin_unlock(&all_mddevs_lock);
7395 return (void*)2;/* tail */
7399 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7401 struct list_head *tmp;
7402 struct mddev *next_mddev, *mddev = v;
7408 spin_lock(&all_mddevs_lock);
7410 tmp = all_mddevs.next;
7412 tmp = mddev->all_mddevs.next;
7413 if (tmp != &all_mddevs)
7414 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7416 next_mddev = (void*)2;
7419 spin_unlock(&all_mddevs_lock);
7427 static void md_seq_stop(struct seq_file *seq, void *v)
7429 struct mddev *mddev = v;
7431 if (mddev && v != (void*)1 && v != (void*)2)
7435 static int md_seq_show(struct seq_file *seq, void *v)
7437 struct mddev *mddev = v;
7439 struct md_rdev *rdev;
7441 if (v == (void*)1) {
7442 struct md_personality *pers;
7443 seq_printf(seq, "Personalities : ");
7444 spin_lock(&pers_lock);
7445 list_for_each_entry(pers, &pers_list, list)
7446 seq_printf(seq, "[%s] ", pers->name);
7448 spin_unlock(&pers_lock);
7449 seq_printf(seq, "\n");
7450 seq->poll_event = atomic_read(&md_event_count);
7453 if (v == (void*)2) {
7458 spin_lock(&mddev->lock);
7459 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7460 seq_printf(seq, "%s : %sactive", mdname(mddev),
7461 mddev->pers ? "" : "in");
7464 seq_printf(seq, " (read-only)");
7466 seq_printf(seq, " (auto-read-only)");
7467 seq_printf(seq, " %s", mddev->pers->name);
7472 rdev_for_each_rcu(rdev, mddev) {
7473 char b[BDEVNAME_SIZE];
7474 seq_printf(seq, " %s[%d]",
7475 bdevname(rdev->bdev,b), rdev->desc_nr);
7476 if (test_bit(WriteMostly, &rdev->flags))
7477 seq_printf(seq, "(W)");
7478 if (test_bit(Journal, &rdev->flags))
7479 seq_printf(seq, "(J)");
7480 if (test_bit(Faulty, &rdev->flags)) {
7481 seq_printf(seq, "(F)");
7484 if (rdev->raid_disk < 0)
7485 seq_printf(seq, "(S)"); /* spare */
7486 if (test_bit(Replacement, &rdev->flags))
7487 seq_printf(seq, "(R)");
7488 sectors += rdev->sectors;
7492 if (!list_empty(&mddev->disks)) {
7494 seq_printf(seq, "\n %llu blocks",
7495 (unsigned long long)
7496 mddev->array_sectors / 2);
7498 seq_printf(seq, "\n %llu blocks",
7499 (unsigned long long)sectors / 2);
7501 if (mddev->persistent) {
7502 if (mddev->major_version != 0 ||
7503 mddev->minor_version != 90) {
7504 seq_printf(seq," super %d.%d",
7505 mddev->major_version,
7506 mddev->minor_version);
7508 } else if (mddev->external)
7509 seq_printf(seq, " super external:%s",
7510 mddev->metadata_type);
7512 seq_printf(seq, " super non-persistent");
7515 mddev->pers->status(seq, mddev);
7516 seq_printf(seq, "\n ");
7517 if (mddev->pers->sync_request) {
7518 if (status_resync(seq, mddev))
7519 seq_printf(seq, "\n ");
7522 seq_printf(seq, "\n ");
7524 bitmap_status(seq, mddev->bitmap);
7526 seq_printf(seq, "\n");
7528 spin_unlock(&mddev->lock);
7533 static const struct seq_operations md_seq_ops = {
7534 .start = md_seq_start,
7535 .next = md_seq_next,
7536 .stop = md_seq_stop,
7537 .show = md_seq_show,
7540 static int md_seq_open(struct inode *inode, struct file *file)
7542 struct seq_file *seq;
7545 error = seq_open(file, &md_seq_ops);
7549 seq = file->private_data;
7550 seq->poll_event = atomic_read(&md_event_count);
7554 static int md_unloading;
7555 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7557 struct seq_file *seq = filp->private_data;
7561 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7562 poll_wait(filp, &md_event_waiters, wait);
7564 /* always allow read */
7565 mask = POLLIN | POLLRDNORM;
7567 if (seq->poll_event != atomic_read(&md_event_count))
7568 mask |= POLLERR | POLLPRI;
7572 static const struct file_operations md_seq_fops = {
7573 .owner = THIS_MODULE,
7574 .open = md_seq_open,
7576 .llseek = seq_lseek,
7577 .release = seq_release_private,
7578 .poll = mdstat_poll,
7581 int register_md_personality(struct md_personality *p)
7583 pr_debug("md: %s personality registered for level %d\n",
7585 spin_lock(&pers_lock);
7586 list_add_tail(&p->list, &pers_list);
7587 spin_unlock(&pers_lock);
7590 EXPORT_SYMBOL(register_md_personality);
7592 int unregister_md_personality(struct md_personality *p)
7594 pr_debug("md: %s personality unregistered\n", p->name);
7595 spin_lock(&pers_lock);
7596 list_del_init(&p->list);
7597 spin_unlock(&pers_lock);
7600 EXPORT_SYMBOL(unregister_md_personality);
7602 int register_md_cluster_operations(struct md_cluster_operations *ops,
7603 struct module *module)
7606 spin_lock(&pers_lock);
7607 if (md_cluster_ops != NULL)
7610 md_cluster_ops = ops;
7611 md_cluster_mod = module;
7613 spin_unlock(&pers_lock);
7616 EXPORT_SYMBOL(register_md_cluster_operations);
7618 int unregister_md_cluster_operations(void)
7620 spin_lock(&pers_lock);
7621 md_cluster_ops = NULL;
7622 spin_unlock(&pers_lock);
7625 EXPORT_SYMBOL(unregister_md_cluster_operations);
7627 int md_setup_cluster(struct mddev *mddev, int nodes)
7629 if (!md_cluster_ops)
7630 request_module("md-cluster");
7631 spin_lock(&pers_lock);
7632 /* ensure module won't be unloaded */
7633 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7634 pr_warn("can't find md-cluster module or get it's reference.\n");
7635 spin_unlock(&pers_lock);
7638 spin_unlock(&pers_lock);
7640 return md_cluster_ops->join(mddev, nodes);
7643 void md_cluster_stop(struct mddev *mddev)
7645 if (!md_cluster_ops)
7647 md_cluster_ops->leave(mddev);
7648 module_put(md_cluster_mod);
7651 static int is_mddev_idle(struct mddev *mddev, int init)
7653 struct md_rdev *rdev;
7659 rdev_for_each_rcu(rdev, mddev) {
7660 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7661 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7662 (int)part_stat_read(&disk->part0, sectors[1]) -
7663 atomic_read(&disk->sync_io);
7664 /* sync IO will cause sync_io to increase before the disk_stats
7665 * as sync_io is counted when a request starts, and
7666 * disk_stats is counted when it completes.
7667 * So resync activity will cause curr_events to be smaller than
7668 * when there was no such activity.
7669 * non-sync IO will cause disk_stat to increase without
7670 * increasing sync_io so curr_events will (eventually)
7671 * be larger than it was before. Once it becomes
7672 * substantially larger, the test below will cause
7673 * the array to appear non-idle, and resync will slow
7675 * If there is a lot of outstanding resync activity when
7676 * we set last_event to curr_events, then all that activity
7677 * completing might cause the array to appear non-idle
7678 * and resync will be slowed down even though there might
7679 * not have been non-resync activity. This will only
7680 * happen once though. 'last_events' will soon reflect
7681 * the state where there is little or no outstanding
7682 * resync requests, and further resync activity will
7683 * always make curr_events less than last_events.
7686 if (init || curr_events - rdev->last_events > 64) {
7687 rdev->last_events = curr_events;
7695 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7697 /* another "blocks" (512byte) blocks have been synced */
7698 atomic_sub(blocks, &mddev->recovery_active);
7699 wake_up(&mddev->recovery_wait);
7701 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7702 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7703 md_wakeup_thread(mddev->thread);
7704 // stop recovery, signal do_sync ....
7707 EXPORT_SYMBOL(md_done_sync);
7709 /* md_write_start(mddev, bi)
7710 * If we need to update some array metadata (e.g. 'active' flag
7711 * in superblock) before writing, schedule a superblock update
7712 * and wait for it to complete.
7714 void md_write_start(struct mddev *mddev, struct bio *bi)
7717 if (bio_data_dir(bi) != WRITE)
7720 BUG_ON(mddev->ro == 1);
7721 if (mddev->ro == 2) {
7722 /* need to switch to read/write */
7724 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7725 md_wakeup_thread(mddev->thread);
7726 md_wakeup_thread(mddev->sync_thread);
7729 atomic_inc(&mddev->writes_pending);
7730 if (mddev->safemode == 1)
7731 mddev->safemode = 0;
7732 if (mddev->in_sync) {
7733 spin_lock(&mddev->lock);
7734 if (mddev->in_sync) {
7736 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7737 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7738 md_wakeup_thread(mddev->thread);
7741 spin_unlock(&mddev->lock);
7744 sysfs_notify_dirent_safe(mddev->sysfs_state);
7745 wait_event(mddev->sb_wait,
7746 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7748 EXPORT_SYMBOL(md_write_start);
7750 void md_write_end(struct mddev *mddev)
7752 if (atomic_dec_and_test(&mddev->writes_pending)) {
7753 if (mddev->safemode == 2)
7754 md_wakeup_thread(mddev->thread);
7755 else if (mddev->safemode_delay)
7756 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7759 EXPORT_SYMBOL(md_write_end);
7761 /* md_allow_write(mddev)
7762 * Calling this ensures that the array is marked 'active' so that writes
7763 * may proceed without blocking. It is important to call this before
7764 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7765 * Must be called with mddev_lock held.
7767 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7768 * is dropped, so return -EAGAIN after notifying userspace.
7770 int md_allow_write(struct mddev *mddev)
7776 if (!mddev->pers->sync_request)
7779 spin_lock(&mddev->lock);
7780 if (mddev->in_sync) {
7782 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7783 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7784 if (mddev->safemode_delay &&
7785 mddev->safemode == 0)
7786 mddev->safemode = 1;
7787 spin_unlock(&mddev->lock);
7788 md_update_sb(mddev, 0);
7789 sysfs_notify_dirent_safe(mddev->sysfs_state);
7791 spin_unlock(&mddev->lock);
7793 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7798 EXPORT_SYMBOL_GPL(md_allow_write);
7800 #define SYNC_MARKS 10
7801 #define SYNC_MARK_STEP (3*HZ)
7802 #define UPDATE_FREQUENCY (5*60*HZ)
7803 void md_do_sync(struct md_thread *thread)
7805 struct mddev *mddev = thread->mddev;
7806 struct mddev *mddev2;
7807 unsigned int currspeed = 0,
7809 sector_t max_sectors,j, io_sectors, recovery_done;
7810 unsigned long mark[SYNC_MARKS];
7811 unsigned long update_time;
7812 sector_t mark_cnt[SYNC_MARKS];
7814 struct list_head *tmp;
7815 sector_t last_check;
7817 struct md_rdev *rdev;
7818 char *desc, *action = NULL;
7819 struct blk_plug plug;
7822 /* just incase thread restarts... */
7823 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7825 if (mddev->ro) {/* never try to sync a read-only array */
7826 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7830 if (mddev_is_clustered(mddev)) {
7831 ret = md_cluster_ops->resync_start(mddev);
7835 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
7836 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7837 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
7838 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
7839 && ((unsigned long long)mddev->curr_resync_completed
7840 < (unsigned long long)mddev->resync_max_sectors))
7844 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7845 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7846 desc = "data-check";
7848 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7849 desc = "requested-resync";
7853 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7858 mddev->last_sync_action = action ?: desc;
7860 /* we overload curr_resync somewhat here.
7861 * 0 == not engaged in resync at all
7862 * 2 == checking that there is no conflict with another sync
7863 * 1 == like 2, but have yielded to allow conflicting resync to
7865 * other == active in resync - this many blocks
7867 * Before starting a resync we must have set curr_resync to
7868 * 2, and then checked that every "conflicting" array has curr_resync
7869 * less than ours. When we find one that is the same or higher
7870 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7871 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7872 * This will mean we have to start checking from the beginning again.
7877 int mddev2_minor = -1;
7878 mddev->curr_resync = 2;
7881 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7883 for_each_mddev(mddev2, tmp) {
7884 if (mddev2 == mddev)
7886 if (!mddev->parallel_resync
7887 && mddev2->curr_resync
7888 && match_mddev_units(mddev, mddev2)) {
7890 if (mddev < mddev2 && mddev->curr_resync == 2) {
7891 /* arbitrarily yield */
7892 mddev->curr_resync = 1;
7893 wake_up(&resync_wait);
7895 if (mddev > mddev2 && mddev->curr_resync == 1)
7896 /* no need to wait here, we can wait the next
7897 * time 'round when curr_resync == 2
7900 /* We need to wait 'interruptible' so as not to
7901 * contribute to the load average, and not to
7902 * be caught by 'softlockup'
7904 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7905 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7906 mddev2->curr_resync >= mddev->curr_resync) {
7907 if (mddev2_minor != mddev2->md_minor) {
7908 mddev2_minor = mddev2->md_minor;
7909 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
7910 desc, mdname(mddev),
7914 if (signal_pending(current))
7915 flush_signals(current);
7917 finish_wait(&resync_wait, &wq);
7920 finish_wait(&resync_wait, &wq);
7923 } while (mddev->curr_resync < 2);
7926 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7927 /* resync follows the size requested by the personality,
7928 * which defaults to physical size, but can be virtual size
7930 max_sectors = mddev->resync_max_sectors;
7931 atomic64_set(&mddev->resync_mismatches, 0);
7932 /* we don't use the checkpoint if there's a bitmap */
7933 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7934 j = mddev->resync_min;
7935 else if (!mddev->bitmap)
7936 j = mddev->recovery_cp;
7938 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7939 max_sectors = mddev->resync_max_sectors;
7941 /* recovery follows the physical size of devices */
7942 max_sectors = mddev->dev_sectors;
7945 rdev_for_each_rcu(rdev, mddev)
7946 if (rdev->raid_disk >= 0 &&
7947 !test_bit(Journal, &rdev->flags) &&
7948 !test_bit(Faulty, &rdev->flags) &&
7949 !test_bit(In_sync, &rdev->flags) &&
7950 rdev->recovery_offset < j)
7951 j = rdev->recovery_offset;
7954 /* If there is a bitmap, we need to make sure all
7955 * writes that started before we added a spare
7956 * complete before we start doing a recovery.
7957 * Otherwise the write might complete and (via
7958 * bitmap_endwrite) set a bit in the bitmap after the
7959 * recovery has checked that bit and skipped that
7962 if (mddev->bitmap) {
7963 mddev->pers->quiesce(mddev, 1);
7964 mddev->pers->quiesce(mddev, 0);
7968 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
7969 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
7970 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
7971 speed_max(mddev), desc);
7973 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7976 for (m = 0; m < SYNC_MARKS; m++) {
7978 mark_cnt[m] = io_sectors;
7981 mddev->resync_mark = mark[last_mark];
7982 mddev->resync_mark_cnt = mark_cnt[last_mark];
7985 * Tune reconstruction:
7987 window = 32*(PAGE_SIZE/512);
7988 pr_debug("md: using %dk window, over a total of %lluk.\n",
7989 window/2, (unsigned long long)max_sectors/2);
7991 atomic_set(&mddev->recovery_active, 0);
7995 pr_debug("md: resuming %s of %s from checkpoint.\n",
7996 desc, mdname(mddev));
7997 mddev->curr_resync = j;
7999 mddev->curr_resync = 3; /* no longer delayed */
8000 mddev->curr_resync_completed = j;
8001 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8002 md_new_event(mddev);
8003 update_time = jiffies;
8005 blk_start_plug(&plug);
8006 while (j < max_sectors) {
8011 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8012 ((mddev->curr_resync > mddev->curr_resync_completed &&
8013 (mddev->curr_resync - mddev->curr_resync_completed)
8014 > (max_sectors >> 4)) ||
8015 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8016 (j - mddev->curr_resync_completed)*2
8017 >= mddev->resync_max - mddev->curr_resync_completed ||
8018 mddev->curr_resync_completed > mddev->resync_max
8020 /* time to update curr_resync_completed */
8021 wait_event(mddev->recovery_wait,
8022 atomic_read(&mddev->recovery_active) == 0);
8023 mddev->curr_resync_completed = j;
8024 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8025 j > mddev->recovery_cp)
8026 mddev->recovery_cp = j;
8027 update_time = jiffies;
8028 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8029 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8032 while (j >= mddev->resync_max &&
8033 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8034 /* As this condition is controlled by user-space,
8035 * we can block indefinitely, so use '_interruptible'
8036 * to avoid triggering warnings.
8038 flush_signals(current); /* just in case */
8039 wait_event_interruptible(mddev->recovery_wait,
8040 mddev->resync_max > j
8041 || test_bit(MD_RECOVERY_INTR,
8045 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8048 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8050 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8054 if (!skipped) { /* actual IO requested */
8055 io_sectors += sectors;
8056 atomic_add(sectors, &mddev->recovery_active);
8059 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8063 if (j > max_sectors)
8064 /* when skipping, extra large numbers can be returned. */
8067 mddev->curr_resync = j;
8068 mddev->curr_mark_cnt = io_sectors;
8069 if (last_check == 0)
8070 /* this is the earliest that rebuild will be
8071 * visible in /proc/mdstat
8073 md_new_event(mddev);
8075 if (last_check + window > io_sectors || j == max_sectors)
8078 last_check = io_sectors;
8080 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8082 int next = (last_mark+1) % SYNC_MARKS;
8084 mddev->resync_mark = mark[next];
8085 mddev->resync_mark_cnt = mark_cnt[next];
8086 mark[next] = jiffies;
8087 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8091 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8095 * this loop exits only if either when we are slower than
8096 * the 'hard' speed limit, or the system was IO-idle for
8098 * the system might be non-idle CPU-wise, but we only care
8099 * about not overloading the IO subsystem. (things like an
8100 * e2fsck being done on the RAID array should execute fast)
8104 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8105 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8106 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8108 if (currspeed > speed_min(mddev)) {
8109 if (currspeed > speed_max(mddev)) {
8113 if (!is_mddev_idle(mddev, 0)) {
8115 * Give other IO more of a chance.
8116 * The faster the devices, the less we wait.
8118 wait_event(mddev->recovery_wait,
8119 !atomic_read(&mddev->recovery_active));
8123 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8124 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8125 ? "interrupted" : "done");
8127 * this also signals 'finished resyncing' to md_stop
8129 blk_finish_plug(&plug);
8130 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8132 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8133 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8134 mddev->curr_resync > 3) {
8135 mddev->curr_resync_completed = mddev->curr_resync;
8136 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8138 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8140 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8141 mddev->curr_resync > 3) {
8142 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8143 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8144 if (mddev->curr_resync >= mddev->recovery_cp) {
8145 pr_debug("md: checkpointing %s of %s.\n",
8146 desc, mdname(mddev));
8147 if (test_bit(MD_RECOVERY_ERROR,
8149 mddev->recovery_cp =
8150 mddev->curr_resync_completed;
8152 mddev->recovery_cp =
8156 mddev->recovery_cp = MaxSector;
8158 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8159 mddev->curr_resync = MaxSector;
8161 rdev_for_each_rcu(rdev, mddev)
8162 if (rdev->raid_disk >= 0 &&
8163 mddev->delta_disks >= 0 &&
8164 !test_bit(Journal, &rdev->flags) &&
8165 !test_bit(Faulty, &rdev->flags) &&
8166 !test_bit(In_sync, &rdev->flags) &&
8167 rdev->recovery_offset < mddev->curr_resync)
8168 rdev->recovery_offset = mddev->curr_resync;
8173 /* set CHANGE_PENDING here since maybe another update is needed,
8174 * so other nodes are informed. It should be harmless for normal
8176 set_mask_bits(&mddev->flags, 0,
8177 BIT(MD_CHANGE_PENDING) | BIT(MD_CHANGE_DEVS));
8179 spin_lock(&mddev->lock);
8180 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8181 /* We completed so min/max setting can be forgotten if used. */
8182 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8183 mddev->resync_min = 0;
8184 mddev->resync_max = MaxSector;
8185 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8186 mddev->resync_min = mddev->curr_resync_completed;
8187 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8188 mddev->curr_resync = 0;
8189 spin_unlock(&mddev->lock);
8191 wake_up(&resync_wait);
8192 md_wakeup_thread(mddev->thread);
8195 EXPORT_SYMBOL_GPL(md_do_sync);
8197 static int remove_and_add_spares(struct mddev *mddev,
8198 struct md_rdev *this)
8200 struct md_rdev *rdev;
8203 bool remove_some = false;
8205 rdev_for_each(rdev, mddev) {
8206 if ((this == NULL || rdev == this) &&
8207 rdev->raid_disk >= 0 &&
8208 !test_bit(Blocked, &rdev->flags) &&
8209 test_bit(Faulty, &rdev->flags) &&
8210 atomic_read(&rdev->nr_pending)==0) {
8211 /* Faulty non-Blocked devices with nr_pending == 0
8212 * never get nr_pending incremented,
8213 * never get Faulty cleared, and never get Blocked set.
8214 * So we can synchronize_rcu now rather than once per device
8217 set_bit(RemoveSynchronized, &rdev->flags);
8223 rdev_for_each(rdev, mddev) {
8224 if ((this == NULL || rdev == this) &&
8225 rdev->raid_disk >= 0 &&
8226 !test_bit(Blocked, &rdev->flags) &&
8227 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8228 (!test_bit(In_sync, &rdev->flags) &&
8229 !test_bit(Journal, &rdev->flags))) &&
8230 atomic_read(&rdev->nr_pending)==0)) {
8231 if (mddev->pers->hot_remove_disk(
8232 mddev, rdev) == 0) {
8233 sysfs_unlink_rdev(mddev, rdev);
8234 rdev->raid_disk = -1;
8238 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8239 clear_bit(RemoveSynchronized, &rdev->flags);
8242 if (removed && mddev->kobj.sd)
8243 sysfs_notify(&mddev->kobj, NULL, "degraded");
8245 if (this && removed)
8248 rdev_for_each(rdev, mddev) {
8249 if (this && this != rdev)
8251 if (test_bit(Candidate, &rdev->flags))
8253 if (rdev->raid_disk >= 0 &&
8254 !test_bit(In_sync, &rdev->flags) &&
8255 !test_bit(Journal, &rdev->flags) &&
8256 !test_bit(Faulty, &rdev->flags))
8258 if (rdev->raid_disk >= 0)
8260 if (test_bit(Faulty, &rdev->flags))
8262 if (!test_bit(Journal, &rdev->flags)) {
8264 ! (rdev->saved_raid_disk >= 0 &&
8265 !test_bit(Bitmap_sync, &rdev->flags)))
8268 rdev->recovery_offset = 0;
8271 hot_add_disk(mddev, rdev) == 0) {
8272 if (sysfs_link_rdev(mddev, rdev))
8273 /* failure here is OK */;
8274 if (!test_bit(Journal, &rdev->flags))
8276 md_new_event(mddev);
8277 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8282 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8286 static void md_start_sync(struct work_struct *ws)
8288 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8290 mddev->sync_thread = md_register_thread(md_do_sync,
8293 if (!mddev->sync_thread) {
8294 pr_warn("%s: could not start resync thread...\n",
8296 /* leave the spares where they are, it shouldn't hurt */
8297 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8298 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8299 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8300 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8301 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8302 wake_up(&resync_wait);
8303 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8305 if (mddev->sysfs_action)
8306 sysfs_notify_dirent_safe(mddev->sysfs_action);
8308 md_wakeup_thread(mddev->sync_thread);
8309 sysfs_notify_dirent_safe(mddev->sysfs_action);
8310 md_new_event(mddev);
8314 * This routine is regularly called by all per-raid-array threads to
8315 * deal with generic issues like resync and super-block update.
8316 * Raid personalities that don't have a thread (linear/raid0) do not
8317 * need this as they never do any recovery or update the superblock.
8319 * It does not do any resync itself, but rather "forks" off other threads
8320 * to do that as needed.
8321 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8322 * "->recovery" and create a thread at ->sync_thread.
8323 * When the thread finishes it sets MD_RECOVERY_DONE
8324 * and wakeups up this thread which will reap the thread and finish up.
8325 * This thread also removes any faulty devices (with nr_pending == 0).
8327 * The overall approach is:
8328 * 1/ if the superblock needs updating, update it.
8329 * 2/ If a recovery thread is running, don't do anything else.
8330 * 3/ If recovery has finished, clean up, possibly marking spares active.
8331 * 4/ If there are any faulty devices, remove them.
8332 * 5/ If array is degraded, try to add spares devices
8333 * 6/ If array has spares or is not in-sync, start a resync thread.
8335 void md_check_recovery(struct mddev *mddev)
8337 if (mddev->suspended)
8341 bitmap_daemon_work(mddev);
8343 if (signal_pending(current)) {
8344 if (mddev->pers->sync_request && !mddev->external) {
8345 pr_debug("md: %s in immediate safe mode\n",
8347 mddev->safemode = 2;
8349 flush_signals(current);
8352 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8355 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8356 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8357 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8358 test_bit(MD_RELOAD_SB, &mddev->flags) ||
8359 (mddev->external == 0 && mddev->safemode == 1) ||
8360 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8361 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8365 if (mddev_trylock(mddev)) {
8369 struct md_rdev *rdev;
8370 if (!mddev->external && mddev->in_sync)
8371 /* 'Blocked' flag not needed as failed devices
8372 * will be recorded if array switched to read/write.
8373 * Leaving it set will prevent the device
8374 * from being removed.
8376 rdev_for_each(rdev, mddev)
8377 clear_bit(Blocked, &rdev->flags);
8378 /* On a read-only array we can:
8379 * - remove failed devices
8380 * - add already-in_sync devices if the array itself
8382 * As we only add devices that are already in-sync,
8383 * we can activate the spares immediately.
8385 remove_and_add_spares(mddev, NULL);
8386 /* There is no thread, but we need to call
8387 * ->spare_active and clear saved_raid_disk
8389 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8390 md_reap_sync_thread(mddev);
8391 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8392 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8393 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8397 if (mddev_is_clustered(mddev)) {
8398 struct md_rdev *rdev;
8399 /* kick the device if another node issued a
8402 rdev_for_each(rdev, mddev) {
8403 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8404 rdev->raid_disk < 0)
8405 md_kick_rdev_from_array(rdev);
8408 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8409 md_reload_sb(mddev, mddev->good_device_nr);
8412 if (!mddev->external) {
8414 spin_lock(&mddev->lock);
8415 if (mddev->safemode &&
8416 !atomic_read(&mddev->writes_pending) &&
8418 mddev->recovery_cp == MaxSector) {
8421 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8423 if (mddev->safemode == 1)
8424 mddev->safemode = 0;
8425 spin_unlock(&mddev->lock);
8427 sysfs_notify_dirent_safe(mddev->sysfs_state);
8430 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8431 md_update_sb(mddev, 0);
8433 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8434 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8435 /* resync/recovery still happening */
8436 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8439 if (mddev->sync_thread) {
8440 md_reap_sync_thread(mddev);
8443 /* Set RUNNING before clearing NEEDED to avoid
8444 * any transients in the value of "sync_action".
8446 mddev->curr_resync_completed = 0;
8447 spin_lock(&mddev->lock);
8448 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8449 spin_unlock(&mddev->lock);
8450 /* Clear some bits that don't mean anything, but
8453 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8454 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8456 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8457 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8459 /* no recovery is running.
8460 * remove any failed drives, then
8461 * add spares if possible.
8462 * Spares are also removed and re-added, to allow
8463 * the personality to fail the re-add.
8466 if (mddev->reshape_position != MaxSector) {
8467 if (mddev->pers->check_reshape == NULL ||
8468 mddev->pers->check_reshape(mddev) != 0)
8469 /* Cannot proceed */
8471 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8472 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8473 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8474 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8475 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8476 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8477 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8478 } else if (mddev->recovery_cp < MaxSector) {
8479 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8480 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8481 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8482 /* nothing to be done ... */
8485 if (mddev->pers->sync_request) {
8487 /* We are adding a device or devices to an array
8488 * which has the bitmap stored on all devices.
8489 * So make sure all bitmap pages get written
8491 bitmap_write_all(mddev->bitmap);
8493 INIT_WORK(&mddev->del_work, md_start_sync);
8494 queue_work(md_misc_wq, &mddev->del_work);
8498 if (!mddev->sync_thread) {
8499 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8500 wake_up(&resync_wait);
8501 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8503 if (mddev->sysfs_action)
8504 sysfs_notify_dirent_safe(mddev->sysfs_action);
8507 wake_up(&mddev->sb_wait);
8508 mddev_unlock(mddev);
8511 EXPORT_SYMBOL(md_check_recovery);
8513 void md_reap_sync_thread(struct mddev *mddev)
8515 struct md_rdev *rdev;
8517 /* resync has finished, collect result */
8518 md_unregister_thread(&mddev->sync_thread);
8519 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8520 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8522 /* activate any spares */
8523 if (mddev->pers->spare_active(mddev)) {
8524 sysfs_notify(&mddev->kobj, NULL,
8526 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8529 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8530 mddev->pers->finish_reshape)
8531 mddev->pers->finish_reshape(mddev);
8533 /* If array is no-longer degraded, then any saved_raid_disk
8534 * information must be scrapped.
8536 if (!mddev->degraded)
8537 rdev_for_each(rdev, mddev)
8538 rdev->saved_raid_disk = -1;
8540 md_update_sb(mddev, 1);
8541 /* MD_CHANGE_PENDING should be cleared by md_update_sb, so we can
8542 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8544 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8545 md_cluster_ops->resync_finish(mddev);
8546 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8547 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8548 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8549 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8550 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8551 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8552 wake_up(&resync_wait);
8553 /* flag recovery needed just to double check */
8554 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8555 sysfs_notify_dirent_safe(mddev->sysfs_action);
8556 md_new_event(mddev);
8557 if (mddev->event_work.func)
8558 queue_work(md_misc_wq, &mddev->event_work);
8560 EXPORT_SYMBOL(md_reap_sync_thread);
8562 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8564 sysfs_notify_dirent_safe(rdev->sysfs_state);
8565 wait_event_timeout(rdev->blocked_wait,
8566 !test_bit(Blocked, &rdev->flags) &&
8567 !test_bit(BlockedBadBlocks, &rdev->flags),
8568 msecs_to_jiffies(5000));
8569 rdev_dec_pending(rdev, mddev);
8571 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8573 void md_finish_reshape(struct mddev *mddev)
8575 /* called be personality module when reshape completes. */
8576 struct md_rdev *rdev;
8578 rdev_for_each(rdev, mddev) {
8579 if (rdev->data_offset > rdev->new_data_offset)
8580 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8582 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8583 rdev->data_offset = rdev->new_data_offset;
8586 EXPORT_SYMBOL(md_finish_reshape);
8588 /* Bad block management */
8590 /* Returns 1 on success, 0 on failure */
8591 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8594 struct mddev *mddev = rdev->mddev;
8597 s += rdev->new_data_offset;
8599 s += rdev->data_offset;
8600 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8602 /* Make sure they get written out promptly */
8603 if (test_bit(ExternalBbl, &rdev->flags))
8604 sysfs_notify(&rdev->kobj, NULL,
8605 "unacknowledged_bad_blocks");
8606 sysfs_notify_dirent_safe(rdev->sysfs_state);
8607 set_mask_bits(&mddev->flags, 0,
8608 BIT(MD_CHANGE_CLEAN) | BIT(MD_CHANGE_PENDING));
8609 md_wakeup_thread(rdev->mddev->thread);
8614 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8616 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8621 s += rdev->new_data_offset;
8623 s += rdev->data_offset;
8624 rv = badblocks_clear(&rdev->badblocks, s, sectors);
8625 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
8626 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
8629 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8631 static int md_notify_reboot(struct notifier_block *this,
8632 unsigned long code, void *x)
8634 struct list_head *tmp;
8635 struct mddev *mddev;
8638 for_each_mddev(mddev, tmp) {
8639 if (mddev_trylock(mddev)) {
8641 __md_stop_writes(mddev);
8642 if (mddev->persistent)
8643 mddev->safemode = 2;
8644 mddev_unlock(mddev);
8649 * certain more exotic SCSI devices are known to be
8650 * volatile wrt too early system reboots. While the
8651 * right place to handle this issue is the given
8652 * driver, we do want to have a safe RAID driver ...
8660 static struct notifier_block md_notifier = {
8661 .notifier_call = md_notify_reboot,
8663 .priority = INT_MAX, /* before any real devices */
8666 static void md_geninit(void)
8668 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8670 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8673 static int __init md_init(void)
8677 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8681 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8685 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8688 if ((ret = register_blkdev(0, "mdp")) < 0)
8692 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8693 md_probe, NULL, NULL);
8694 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8695 md_probe, NULL, NULL);
8697 register_reboot_notifier(&md_notifier);
8698 raid_table_header = register_sysctl_table(raid_root_table);
8704 unregister_blkdev(MD_MAJOR, "md");
8706 destroy_workqueue(md_misc_wq);
8708 destroy_workqueue(md_wq);
8713 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8715 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8716 struct md_rdev *rdev2;
8718 char b[BDEVNAME_SIZE];
8720 /* Check for change of roles in the active devices */
8721 rdev_for_each(rdev2, mddev) {
8722 if (test_bit(Faulty, &rdev2->flags))
8725 /* Check if the roles changed */
8726 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8728 if (test_bit(Candidate, &rdev2->flags)) {
8729 if (role == 0xfffe) {
8730 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8731 md_kick_rdev_from_array(rdev2);
8735 clear_bit(Candidate, &rdev2->flags);
8738 if (role != rdev2->raid_disk) {
8740 if (rdev2->raid_disk == -1 && role != 0xffff) {
8741 rdev2->saved_raid_disk = role;
8742 ret = remove_and_add_spares(mddev, rdev2);
8743 pr_info("Activated spare: %s\n",
8744 bdevname(rdev2->bdev,b));
8745 /* wakeup mddev->thread here, so array could
8746 * perform resync with the new activated disk */
8747 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8748 md_wakeup_thread(mddev->thread);
8752 * We just want to do the minimum to mark the disk
8753 * as faulty. The recovery is performed by the
8754 * one who initiated the error.
8756 if ((role == 0xfffe) || (role == 0xfffd)) {
8757 md_error(mddev, rdev2);
8758 clear_bit(Blocked, &rdev2->flags);
8763 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8764 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8766 /* Finally set the event to be up to date */
8767 mddev->events = le64_to_cpu(sb->events);
8770 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8773 struct page *swapout = rdev->sb_page;
8774 struct mdp_superblock_1 *sb;
8776 /* Store the sb page of the rdev in the swapout temporary
8777 * variable in case we err in the future
8779 rdev->sb_page = NULL;
8780 err = alloc_disk_sb(rdev);
8782 ClearPageUptodate(rdev->sb_page);
8783 rdev->sb_loaded = 0;
8784 err = super_types[mddev->major_version].
8785 load_super(rdev, NULL, mddev->minor_version);
8788 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8789 __func__, __LINE__, rdev->desc_nr, err);
8791 put_page(rdev->sb_page);
8792 rdev->sb_page = swapout;
8793 rdev->sb_loaded = 1;
8797 sb = page_address(rdev->sb_page);
8798 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8802 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8803 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8805 /* The other node finished recovery, call spare_active to set
8806 * device In_sync and mddev->degraded
8808 if (rdev->recovery_offset == MaxSector &&
8809 !test_bit(In_sync, &rdev->flags) &&
8810 mddev->pers->spare_active(mddev))
8811 sysfs_notify(&mddev->kobj, NULL, "degraded");
8817 void md_reload_sb(struct mddev *mddev, int nr)
8819 struct md_rdev *rdev;
8823 rdev_for_each_rcu(rdev, mddev) {
8824 if (rdev->desc_nr == nr)
8828 if (!rdev || rdev->desc_nr != nr) {
8829 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8833 err = read_rdev(mddev, rdev);
8837 check_sb_changes(mddev, rdev);
8839 /* Read all rdev's to update recovery_offset */
8840 rdev_for_each_rcu(rdev, mddev)
8841 read_rdev(mddev, rdev);
8843 EXPORT_SYMBOL(md_reload_sb);
8848 * Searches all registered partitions for autorun RAID arrays
8852 static DEFINE_MUTEX(detected_devices_mutex);
8853 static LIST_HEAD(all_detected_devices);
8854 struct detected_devices_node {
8855 struct list_head list;
8859 void md_autodetect_dev(dev_t dev)
8861 struct detected_devices_node *node_detected_dev;
8863 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8864 if (node_detected_dev) {
8865 node_detected_dev->dev = dev;
8866 mutex_lock(&detected_devices_mutex);
8867 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8868 mutex_unlock(&detected_devices_mutex);
8872 static void autostart_arrays(int part)
8874 struct md_rdev *rdev;
8875 struct detected_devices_node *node_detected_dev;
8877 int i_scanned, i_passed;
8882 pr_info("md: Autodetecting RAID arrays.\n");
8884 mutex_lock(&detected_devices_mutex);
8885 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8887 node_detected_dev = list_entry(all_detected_devices.next,
8888 struct detected_devices_node, list);
8889 list_del(&node_detected_dev->list);
8890 dev = node_detected_dev->dev;
8891 kfree(node_detected_dev);
8892 mutex_unlock(&detected_devices_mutex);
8893 rdev = md_import_device(dev,0, 90);
8894 mutex_lock(&detected_devices_mutex);
8898 if (test_bit(Faulty, &rdev->flags))
8901 set_bit(AutoDetected, &rdev->flags);
8902 list_add(&rdev->same_set, &pending_raid_disks);
8905 mutex_unlock(&detected_devices_mutex);
8907 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
8909 autorun_devices(part);
8912 #endif /* !MODULE */
8914 static __exit void md_exit(void)
8916 struct mddev *mddev;
8917 struct list_head *tmp;
8920 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8921 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8923 unregister_blkdev(MD_MAJOR,"md");
8924 unregister_blkdev(mdp_major, "mdp");
8925 unregister_reboot_notifier(&md_notifier);
8926 unregister_sysctl_table(raid_table_header);
8928 /* We cannot unload the modules while some process is
8929 * waiting for us in select() or poll() - wake them up
8932 while (waitqueue_active(&md_event_waiters)) {
8933 /* not safe to leave yet */
8934 wake_up(&md_event_waiters);
8938 remove_proc_entry("mdstat", NULL);
8940 for_each_mddev(mddev, tmp) {
8941 export_array(mddev);
8942 mddev->hold_active = 0;
8944 destroy_workqueue(md_misc_wq);
8945 destroy_workqueue(md_wq);
8948 subsys_initcall(md_init);
8949 module_exit(md_exit)
8951 static int get_ro(char *buffer, struct kernel_param *kp)
8953 return sprintf(buffer, "%d", start_readonly);
8955 static int set_ro(const char *val, struct kernel_param *kp)
8957 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
8960 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8961 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8962 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8964 MODULE_LICENSE("GPL");
8965 MODULE_DESCRIPTION("MD RAID framework");
8967 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);