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 } else /* MULTIPATH are always insync */
1168 set_bit(In_sync, &rdev->flags);
1173 * sync_super for 0.90.0
1175 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1178 struct md_rdev *rdev2;
1179 int next_spare = mddev->raid_disks;
1181 /* make rdev->sb match mddev data..
1184 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1185 * 3/ any empty disks < next_spare become removed
1187 * disks[0] gets initialised to REMOVED because
1188 * we cannot be sure from other fields if it has
1189 * been initialised or not.
1192 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1194 rdev->sb_size = MD_SB_BYTES;
1196 sb = page_address(rdev->sb_page);
1198 memset(sb, 0, sizeof(*sb));
1200 sb->md_magic = MD_SB_MAGIC;
1201 sb->major_version = mddev->major_version;
1202 sb->patch_version = mddev->patch_version;
1203 sb->gvalid_words = 0; /* ignored */
1204 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1205 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1206 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1207 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1209 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1210 sb->level = mddev->level;
1211 sb->size = mddev->dev_sectors / 2;
1212 sb->raid_disks = mddev->raid_disks;
1213 sb->md_minor = mddev->md_minor;
1214 sb->not_persistent = 0;
1215 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1217 sb->events_hi = (mddev->events>>32);
1218 sb->events_lo = (u32)mddev->events;
1220 if (mddev->reshape_position == MaxSector)
1221 sb->minor_version = 90;
1223 sb->minor_version = 91;
1224 sb->reshape_position = mddev->reshape_position;
1225 sb->new_level = mddev->new_level;
1226 sb->delta_disks = mddev->delta_disks;
1227 sb->new_layout = mddev->new_layout;
1228 sb->new_chunk = mddev->new_chunk_sectors << 9;
1230 mddev->minor_version = sb->minor_version;
1233 sb->recovery_cp = mddev->recovery_cp;
1234 sb->cp_events_hi = (mddev->events>>32);
1235 sb->cp_events_lo = (u32)mddev->events;
1236 if (mddev->recovery_cp == MaxSector)
1237 sb->state = (1<< MD_SB_CLEAN);
1239 sb->recovery_cp = 0;
1241 sb->layout = mddev->layout;
1242 sb->chunk_size = mddev->chunk_sectors << 9;
1244 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1245 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1247 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1248 rdev_for_each(rdev2, mddev) {
1251 int is_active = test_bit(In_sync, &rdev2->flags);
1253 if (rdev2->raid_disk >= 0 &&
1254 sb->minor_version >= 91)
1255 /* we have nowhere to store the recovery_offset,
1256 * but if it is not below the reshape_position,
1257 * we can piggy-back on that.
1260 if (rdev2->raid_disk < 0 ||
1261 test_bit(Faulty, &rdev2->flags))
1264 desc_nr = rdev2->raid_disk;
1266 desc_nr = next_spare++;
1267 rdev2->desc_nr = desc_nr;
1268 d = &sb->disks[rdev2->desc_nr];
1270 d->number = rdev2->desc_nr;
1271 d->major = MAJOR(rdev2->bdev->bd_dev);
1272 d->minor = MINOR(rdev2->bdev->bd_dev);
1274 d->raid_disk = rdev2->raid_disk;
1276 d->raid_disk = rdev2->desc_nr; /* compatibility */
1277 if (test_bit(Faulty, &rdev2->flags))
1278 d->state = (1<<MD_DISK_FAULTY);
1279 else if (is_active) {
1280 d->state = (1<<MD_DISK_ACTIVE);
1281 if (test_bit(In_sync, &rdev2->flags))
1282 d->state |= (1<<MD_DISK_SYNC);
1290 if (test_bit(WriteMostly, &rdev2->flags))
1291 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1293 /* now set the "removed" and "faulty" bits on any missing devices */
1294 for (i=0 ; i < mddev->raid_disks ; i++) {
1295 mdp_disk_t *d = &sb->disks[i];
1296 if (d->state == 0 && d->number == 0) {
1299 d->state = (1<<MD_DISK_REMOVED);
1300 d->state |= (1<<MD_DISK_FAULTY);
1304 sb->nr_disks = nr_disks;
1305 sb->active_disks = active;
1306 sb->working_disks = working;
1307 sb->failed_disks = failed;
1308 sb->spare_disks = spare;
1310 sb->this_disk = sb->disks[rdev->desc_nr];
1311 sb->sb_csum = calc_sb_csum(sb);
1315 * rdev_size_change for 0.90.0
1317 static unsigned long long
1318 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1320 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1321 return 0; /* component must fit device */
1322 if (rdev->mddev->bitmap_info.offset)
1323 return 0; /* can't move bitmap */
1324 rdev->sb_start = calc_dev_sboffset(rdev);
1325 if (!num_sectors || num_sectors > rdev->sb_start)
1326 num_sectors = rdev->sb_start;
1327 /* Limit to 4TB as metadata cannot record more than that.
1328 * 4TB == 2^32 KB, or 2*2^32 sectors.
1330 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1331 rdev->mddev->level >= 1)
1332 num_sectors = (sector_t)(2ULL << 32) - 2;
1333 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1335 md_super_wait(rdev->mddev);
1340 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1342 /* non-zero offset changes not possible with v0.90 */
1343 return new_offset == 0;
1347 * version 1 superblock
1350 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1354 unsigned long long newcsum;
1355 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1356 __le32 *isuper = (__le32*)sb;
1358 disk_csum = sb->sb_csum;
1361 for (; size >= 4; size -= 4)
1362 newcsum += le32_to_cpu(*isuper++);
1365 newcsum += le16_to_cpu(*(__le16*) isuper);
1367 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1368 sb->sb_csum = disk_csum;
1369 return cpu_to_le32(csum);
1372 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1374 struct mdp_superblock_1 *sb;
1378 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1382 * Calculate the position of the superblock in 512byte sectors.
1383 * It is always aligned to a 4K boundary and
1384 * depeding on minor_version, it can be:
1385 * 0: At least 8K, but less than 12K, from end of device
1386 * 1: At start of device
1387 * 2: 4K from start of device.
1389 switch(minor_version) {
1391 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1393 sb_start &= ~(sector_t)(4*2-1);
1404 rdev->sb_start = sb_start;
1406 /* superblock is rarely larger than 1K, but it can be larger,
1407 * and it is safe to read 4k, so we do that
1409 ret = read_disk_sb(rdev, 4096);
1410 if (ret) return ret;
1412 sb = page_address(rdev->sb_page);
1414 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1415 sb->major_version != cpu_to_le32(1) ||
1416 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1417 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1418 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1421 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1422 pr_warn("md: invalid superblock checksum on %s\n",
1423 bdevname(rdev->bdev,b));
1426 if (le64_to_cpu(sb->data_size) < 10) {
1427 pr_warn("md: data_size too small on %s\n",
1428 bdevname(rdev->bdev,b));
1433 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1434 /* Some padding is non-zero, might be a new feature */
1437 rdev->preferred_minor = 0xffff;
1438 rdev->data_offset = le64_to_cpu(sb->data_offset);
1439 rdev->new_data_offset = rdev->data_offset;
1440 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1441 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1442 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1443 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1445 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1446 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1447 if (rdev->sb_size & bmask)
1448 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1451 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1454 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1457 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1460 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1462 if (!rdev->bb_page) {
1463 rdev->bb_page = alloc_page(GFP_KERNEL);
1467 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1468 rdev->badblocks.count == 0) {
1469 /* need to load the bad block list.
1470 * Currently we limit it to one page.
1476 int sectors = le16_to_cpu(sb->bblog_size);
1477 if (sectors > (PAGE_SIZE / 512))
1479 offset = le32_to_cpu(sb->bblog_offset);
1482 bb_sector = (long long)offset;
1483 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1484 rdev->bb_page, REQ_OP_READ, 0, true))
1486 bbp = (u64 *)page_address(rdev->bb_page);
1487 rdev->badblocks.shift = sb->bblog_shift;
1488 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1489 u64 bb = le64_to_cpu(*bbp);
1490 int count = bb & (0x3ff);
1491 u64 sector = bb >> 10;
1492 sector <<= sb->bblog_shift;
1493 count <<= sb->bblog_shift;
1496 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1499 } else if (sb->bblog_offset != 0)
1500 rdev->badblocks.shift = 0;
1506 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1508 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1509 sb->level != refsb->level ||
1510 sb->layout != refsb->layout ||
1511 sb->chunksize != refsb->chunksize) {
1512 pr_warn("md: %s has strangely different superblock to %s\n",
1513 bdevname(rdev->bdev,b),
1514 bdevname(refdev->bdev,b2));
1517 ev1 = le64_to_cpu(sb->events);
1518 ev2 = le64_to_cpu(refsb->events);
1525 if (minor_version) {
1526 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1527 sectors -= rdev->data_offset;
1529 sectors = rdev->sb_start;
1530 if (sectors < le64_to_cpu(sb->data_size))
1532 rdev->sectors = le64_to_cpu(sb->data_size);
1536 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1538 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1539 __u64 ev1 = le64_to_cpu(sb->events);
1541 rdev->raid_disk = -1;
1542 clear_bit(Faulty, &rdev->flags);
1543 clear_bit(In_sync, &rdev->flags);
1544 clear_bit(Bitmap_sync, &rdev->flags);
1545 clear_bit(WriteMostly, &rdev->flags);
1547 if (mddev->raid_disks == 0) {
1548 mddev->major_version = 1;
1549 mddev->patch_version = 0;
1550 mddev->external = 0;
1551 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1552 mddev->ctime = le64_to_cpu(sb->ctime);
1553 mddev->utime = le64_to_cpu(sb->utime);
1554 mddev->level = le32_to_cpu(sb->level);
1555 mddev->clevel[0] = 0;
1556 mddev->layout = le32_to_cpu(sb->layout);
1557 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1558 mddev->dev_sectors = le64_to_cpu(sb->size);
1559 mddev->events = ev1;
1560 mddev->bitmap_info.offset = 0;
1561 mddev->bitmap_info.space = 0;
1562 /* Default location for bitmap is 1K after superblock
1563 * using 3K - total of 4K
1565 mddev->bitmap_info.default_offset = 1024 >> 9;
1566 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1567 mddev->reshape_backwards = 0;
1569 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1570 memcpy(mddev->uuid, sb->set_uuid, 16);
1572 mddev->max_disks = (4096-256)/2;
1574 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1575 mddev->bitmap_info.file == NULL) {
1576 mddev->bitmap_info.offset =
1577 (__s32)le32_to_cpu(sb->bitmap_offset);
1578 /* Metadata doesn't record how much space is available.
1579 * For 1.0, we assume we can use up to the superblock
1580 * if before, else to 4K beyond superblock.
1581 * For others, assume no change is possible.
1583 if (mddev->minor_version > 0)
1584 mddev->bitmap_info.space = 0;
1585 else if (mddev->bitmap_info.offset > 0)
1586 mddev->bitmap_info.space =
1587 8 - mddev->bitmap_info.offset;
1589 mddev->bitmap_info.space =
1590 -mddev->bitmap_info.offset;
1593 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1594 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1595 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1596 mddev->new_level = le32_to_cpu(sb->new_level);
1597 mddev->new_layout = le32_to_cpu(sb->new_layout);
1598 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1599 if (mddev->delta_disks < 0 ||
1600 (mddev->delta_disks == 0 &&
1601 (le32_to_cpu(sb->feature_map)
1602 & MD_FEATURE_RESHAPE_BACKWARDS)))
1603 mddev->reshape_backwards = 1;
1605 mddev->reshape_position = MaxSector;
1606 mddev->delta_disks = 0;
1607 mddev->new_level = mddev->level;
1608 mddev->new_layout = mddev->layout;
1609 mddev->new_chunk_sectors = mddev->chunk_sectors;
1612 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1613 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1614 } else if (mddev->pers == NULL) {
1615 /* Insist of good event counter while assembling, except for
1616 * spares (which don't need an event count) */
1618 if (rdev->desc_nr >= 0 &&
1619 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1620 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1621 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1622 if (ev1 < mddev->events)
1624 } else if (mddev->bitmap) {
1625 /* If adding to array with a bitmap, then we can accept an
1626 * older device, but not too old.
1628 if (ev1 < mddev->bitmap->events_cleared)
1630 if (ev1 < mddev->events)
1631 set_bit(Bitmap_sync, &rdev->flags);
1633 if (ev1 < mddev->events)
1634 /* just a hot-add of a new device, leave raid_disk at -1 */
1637 if (mddev->level != LEVEL_MULTIPATH) {
1639 if (rdev->desc_nr < 0 ||
1640 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1641 role = MD_DISK_ROLE_SPARE;
1644 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1646 case MD_DISK_ROLE_SPARE: /* spare */
1648 case MD_DISK_ROLE_FAULTY: /* faulty */
1649 set_bit(Faulty, &rdev->flags);
1651 case MD_DISK_ROLE_JOURNAL: /* journal device */
1652 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1653 /* journal device without journal feature */
1654 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1657 set_bit(Journal, &rdev->flags);
1658 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1659 rdev->raid_disk = 0;
1662 rdev->saved_raid_disk = role;
1663 if ((le32_to_cpu(sb->feature_map) &
1664 MD_FEATURE_RECOVERY_OFFSET)) {
1665 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1666 if (!(le32_to_cpu(sb->feature_map) &
1667 MD_FEATURE_RECOVERY_BITMAP))
1668 rdev->saved_raid_disk = -1;
1670 set_bit(In_sync, &rdev->flags);
1671 rdev->raid_disk = role;
1674 if (sb->devflags & WriteMostly1)
1675 set_bit(WriteMostly, &rdev->flags);
1676 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1677 set_bit(Replacement, &rdev->flags);
1678 } else /* MULTIPATH are always insync */
1679 set_bit(In_sync, &rdev->flags);
1684 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1686 struct mdp_superblock_1 *sb;
1687 struct md_rdev *rdev2;
1689 /* make rdev->sb match mddev and rdev data. */
1691 sb = page_address(rdev->sb_page);
1693 sb->feature_map = 0;
1695 sb->recovery_offset = cpu_to_le64(0);
1696 memset(sb->pad3, 0, sizeof(sb->pad3));
1698 sb->utime = cpu_to_le64((__u64)mddev->utime);
1699 sb->events = cpu_to_le64(mddev->events);
1701 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1702 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1703 sb->resync_offset = cpu_to_le64(MaxSector);
1705 sb->resync_offset = cpu_to_le64(0);
1707 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1709 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1710 sb->size = cpu_to_le64(mddev->dev_sectors);
1711 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1712 sb->level = cpu_to_le32(mddev->level);
1713 sb->layout = cpu_to_le32(mddev->layout);
1715 if (test_bit(WriteMostly, &rdev->flags))
1716 sb->devflags |= WriteMostly1;
1718 sb->devflags &= ~WriteMostly1;
1719 sb->data_offset = cpu_to_le64(rdev->data_offset);
1720 sb->data_size = cpu_to_le64(rdev->sectors);
1722 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1723 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1724 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1727 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1728 !test_bit(In_sync, &rdev->flags)) {
1730 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1731 sb->recovery_offset =
1732 cpu_to_le64(rdev->recovery_offset);
1733 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1735 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1737 /* Note: recovery_offset and journal_tail share space */
1738 if (test_bit(Journal, &rdev->flags))
1739 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1740 if (test_bit(Replacement, &rdev->flags))
1742 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1744 if (mddev->reshape_position != MaxSector) {
1745 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1746 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1747 sb->new_layout = cpu_to_le32(mddev->new_layout);
1748 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1749 sb->new_level = cpu_to_le32(mddev->new_level);
1750 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1751 if (mddev->delta_disks == 0 &&
1752 mddev->reshape_backwards)
1754 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1755 if (rdev->new_data_offset != rdev->data_offset) {
1757 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1758 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1759 - rdev->data_offset));
1763 if (mddev_is_clustered(mddev))
1764 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1766 if (rdev->badblocks.count == 0)
1767 /* Nothing to do for bad blocks*/ ;
1768 else if (sb->bblog_offset == 0)
1769 /* Cannot record bad blocks on this device */
1770 md_error(mddev, rdev);
1772 struct badblocks *bb = &rdev->badblocks;
1773 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1775 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1780 seq = read_seqbegin(&bb->lock);
1782 memset(bbp, 0xff, PAGE_SIZE);
1784 for (i = 0 ; i < bb->count ; i++) {
1785 u64 internal_bb = p[i];
1786 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1787 | BB_LEN(internal_bb));
1788 bbp[i] = cpu_to_le64(store_bb);
1791 if (read_seqretry(&bb->lock, seq))
1794 bb->sector = (rdev->sb_start +
1795 (int)le32_to_cpu(sb->bblog_offset));
1796 bb->size = le16_to_cpu(sb->bblog_size);
1801 rdev_for_each(rdev2, mddev)
1802 if (rdev2->desc_nr+1 > max_dev)
1803 max_dev = rdev2->desc_nr+1;
1805 if (max_dev > le32_to_cpu(sb->max_dev)) {
1807 sb->max_dev = cpu_to_le32(max_dev);
1808 rdev->sb_size = max_dev * 2 + 256;
1809 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1810 if (rdev->sb_size & bmask)
1811 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1813 max_dev = le32_to_cpu(sb->max_dev);
1815 for (i=0; i<max_dev;i++)
1816 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1818 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1819 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1821 rdev_for_each(rdev2, mddev) {
1823 if (test_bit(Faulty, &rdev2->flags))
1824 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1825 else if (test_bit(In_sync, &rdev2->flags))
1826 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1827 else if (test_bit(Journal, &rdev2->flags))
1828 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1829 else if (rdev2->raid_disk >= 0)
1830 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1832 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1835 sb->sb_csum = calc_sb_1_csum(sb);
1838 static unsigned long long
1839 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1841 struct mdp_superblock_1 *sb;
1842 sector_t max_sectors;
1843 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1844 return 0; /* component must fit device */
1845 if (rdev->data_offset != rdev->new_data_offset)
1846 return 0; /* too confusing */
1847 if (rdev->sb_start < rdev->data_offset) {
1848 /* minor versions 1 and 2; superblock before data */
1849 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1850 max_sectors -= rdev->data_offset;
1851 if (!num_sectors || num_sectors > max_sectors)
1852 num_sectors = max_sectors;
1853 } else if (rdev->mddev->bitmap_info.offset) {
1854 /* minor version 0 with bitmap we can't move */
1857 /* minor version 0; superblock after data */
1859 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1860 sb_start &= ~(sector_t)(4*2 - 1);
1861 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1862 if (!num_sectors || num_sectors > max_sectors)
1863 num_sectors = max_sectors;
1864 rdev->sb_start = sb_start;
1866 sb = page_address(rdev->sb_page);
1867 sb->data_size = cpu_to_le64(num_sectors);
1868 sb->super_offset = rdev->sb_start;
1869 sb->sb_csum = calc_sb_1_csum(sb);
1870 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1872 md_super_wait(rdev->mddev);
1878 super_1_allow_new_offset(struct md_rdev *rdev,
1879 unsigned long long new_offset)
1881 /* All necessary checks on new >= old have been done */
1882 struct bitmap *bitmap;
1883 if (new_offset >= rdev->data_offset)
1886 /* with 1.0 metadata, there is no metadata to tread on
1887 * so we can always move back */
1888 if (rdev->mddev->minor_version == 0)
1891 /* otherwise we must be sure not to step on
1892 * any metadata, so stay:
1893 * 36K beyond start of superblock
1894 * beyond end of badblocks
1895 * beyond write-intent bitmap
1897 if (rdev->sb_start + (32+4)*2 > new_offset)
1899 bitmap = rdev->mddev->bitmap;
1900 if (bitmap && !rdev->mddev->bitmap_info.file &&
1901 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1902 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1904 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1910 static struct super_type super_types[] = {
1913 .owner = THIS_MODULE,
1914 .load_super = super_90_load,
1915 .validate_super = super_90_validate,
1916 .sync_super = super_90_sync,
1917 .rdev_size_change = super_90_rdev_size_change,
1918 .allow_new_offset = super_90_allow_new_offset,
1922 .owner = THIS_MODULE,
1923 .load_super = super_1_load,
1924 .validate_super = super_1_validate,
1925 .sync_super = super_1_sync,
1926 .rdev_size_change = super_1_rdev_size_change,
1927 .allow_new_offset = super_1_allow_new_offset,
1931 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1933 if (mddev->sync_super) {
1934 mddev->sync_super(mddev, rdev);
1938 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1940 super_types[mddev->major_version].sync_super(mddev, rdev);
1943 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1945 struct md_rdev *rdev, *rdev2;
1948 rdev_for_each_rcu(rdev, mddev1) {
1949 if (test_bit(Faulty, &rdev->flags) ||
1950 test_bit(Journal, &rdev->flags) ||
1951 rdev->raid_disk == -1)
1953 rdev_for_each_rcu(rdev2, mddev2) {
1954 if (test_bit(Faulty, &rdev2->flags) ||
1955 test_bit(Journal, &rdev2->flags) ||
1956 rdev2->raid_disk == -1)
1958 if (rdev->bdev->bd_contains ==
1959 rdev2->bdev->bd_contains) {
1969 static LIST_HEAD(pending_raid_disks);
1972 * Try to register data integrity profile for an mddev
1974 * This is called when an array is started and after a disk has been kicked
1975 * from the array. It only succeeds if all working and active component devices
1976 * are integrity capable with matching profiles.
1978 int md_integrity_register(struct mddev *mddev)
1980 struct md_rdev *rdev, *reference = NULL;
1982 if (list_empty(&mddev->disks))
1983 return 0; /* nothing to do */
1984 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1985 return 0; /* shouldn't register, or already is */
1986 rdev_for_each(rdev, mddev) {
1987 /* skip spares and non-functional disks */
1988 if (test_bit(Faulty, &rdev->flags))
1990 if (rdev->raid_disk < 0)
1993 /* Use the first rdev as the reference */
1997 /* does this rdev's profile match the reference profile? */
1998 if (blk_integrity_compare(reference->bdev->bd_disk,
1999 rdev->bdev->bd_disk) < 0)
2002 if (!reference || !bdev_get_integrity(reference->bdev))
2005 * All component devices are integrity capable and have matching
2006 * profiles, register the common profile for the md device.
2008 blk_integrity_register(mddev->gendisk,
2009 bdev_get_integrity(reference->bdev));
2011 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2012 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2013 pr_err("md: failed to create integrity pool for %s\n",
2019 EXPORT_SYMBOL(md_integrity_register);
2022 * Attempt to add an rdev, but only if it is consistent with the current
2025 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2027 struct blk_integrity *bi_rdev;
2028 struct blk_integrity *bi_mddev;
2029 char name[BDEVNAME_SIZE];
2031 if (!mddev->gendisk)
2034 bi_rdev = bdev_get_integrity(rdev->bdev);
2035 bi_mddev = blk_get_integrity(mddev->gendisk);
2037 if (!bi_mddev) /* nothing to do */
2040 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2041 pr_err("%s: incompatible integrity profile for %s\n",
2042 mdname(mddev), bdevname(rdev->bdev, name));
2048 EXPORT_SYMBOL(md_integrity_add_rdev);
2050 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2052 char b[BDEVNAME_SIZE];
2056 /* prevent duplicates */
2057 if (find_rdev(mddev, rdev->bdev->bd_dev))
2060 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2061 if (!test_bit(Journal, &rdev->flags) &&
2063 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2065 /* Cannot change size, so fail
2066 * If mddev->level <= 0, then we don't care
2067 * about aligning sizes (e.g. linear)
2069 if (mddev->level > 0)
2072 mddev->dev_sectors = rdev->sectors;
2075 /* Verify rdev->desc_nr is unique.
2076 * If it is -1, assign a free number, else
2077 * check number is not in use
2080 if (rdev->desc_nr < 0) {
2083 choice = mddev->raid_disks;
2084 while (md_find_rdev_nr_rcu(mddev, choice))
2086 rdev->desc_nr = choice;
2088 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2094 if (!test_bit(Journal, &rdev->flags) &&
2095 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2096 pr_warn("md: %s: array is limited to %d devices\n",
2097 mdname(mddev), mddev->max_disks);
2100 bdevname(rdev->bdev,b);
2101 strreplace(b, '/', '!');
2103 rdev->mddev = mddev;
2104 pr_debug("md: bind<%s>\n", b);
2106 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2109 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2110 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2111 /* failure here is OK */;
2112 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2114 list_add_rcu(&rdev->same_set, &mddev->disks);
2115 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2117 /* May as well allow recovery to be retried once */
2118 mddev->recovery_disabled++;
2123 pr_warn("md: failed to register dev-%s for %s\n",
2128 static void md_delayed_delete(struct work_struct *ws)
2130 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2131 kobject_del(&rdev->kobj);
2132 kobject_put(&rdev->kobj);
2135 static void unbind_rdev_from_array(struct md_rdev *rdev)
2137 char b[BDEVNAME_SIZE];
2139 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2140 list_del_rcu(&rdev->same_set);
2141 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2143 sysfs_remove_link(&rdev->kobj, "block");
2144 sysfs_put(rdev->sysfs_state);
2145 rdev->sysfs_state = NULL;
2146 rdev->badblocks.count = 0;
2147 /* We need to delay this, otherwise we can deadlock when
2148 * writing to 'remove' to "dev/state". We also need
2149 * to delay it due to rcu usage.
2152 INIT_WORK(&rdev->del_work, md_delayed_delete);
2153 kobject_get(&rdev->kobj);
2154 queue_work(md_misc_wq, &rdev->del_work);
2158 * prevent the device from being mounted, repartitioned or
2159 * otherwise reused by a RAID array (or any other kernel
2160 * subsystem), by bd_claiming the device.
2162 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2165 struct block_device *bdev;
2166 char b[BDEVNAME_SIZE];
2168 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2169 shared ? (struct md_rdev *)lock_rdev : rdev);
2171 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2172 return PTR_ERR(bdev);
2178 static void unlock_rdev(struct md_rdev *rdev)
2180 struct block_device *bdev = rdev->bdev;
2182 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2185 void md_autodetect_dev(dev_t dev);
2187 static void export_rdev(struct md_rdev *rdev)
2189 char b[BDEVNAME_SIZE];
2191 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2192 md_rdev_clear(rdev);
2194 if (test_bit(AutoDetected, &rdev->flags))
2195 md_autodetect_dev(rdev->bdev->bd_dev);
2198 kobject_put(&rdev->kobj);
2201 void md_kick_rdev_from_array(struct md_rdev *rdev)
2203 unbind_rdev_from_array(rdev);
2206 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2208 static void export_array(struct mddev *mddev)
2210 struct md_rdev *rdev;
2212 while (!list_empty(&mddev->disks)) {
2213 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2215 md_kick_rdev_from_array(rdev);
2217 mddev->raid_disks = 0;
2218 mddev->major_version = 0;
2221 static void sync_sbs(struct mddev *mddev, int nospares)
2223 /* Update each superblock (in-memory image), but
2224 * if we are allowed to, skip spares which already
2225 * have the right event counter, or have one earlier
2226 * (which would mean they aren't being marked as dirty
2227 * with the rest of the array)
2229 struct md_rdev *rdev;
2230 rdev_for_each(rdev, mddev) {
2231 if (rdev->sb_events == mddev->events ||
2233 rdev->raid_disk < 0 &&
2234 rdev->sb_events+1 == mddev->events)) {
2235 /* Don't update this superblock */
2236 rdev->sb_loaded = 2;
2238 sync_super(mddev, rdev);
2239 rdev->sb_loaded = 1;
2244 static bool does_sb_need_changing(struct mddev *mddev)
2246 struct md_rdev *rdev;
2247 struct mdp_superblock_1 *sb;
2250 /* Find a good rdev */
2251 rdev_for_each(rdev, mddev)
2252 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2255 /* No good device found. */
2259 sb = page_address(rdev->sb_page);
2260 /* Check if a device has become faulty or a spare become active */
2261 rdev_for_each(rdev, mddev) {
2262 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2263 /* Device activated? */
2264 if (role == 0xffff && rdev->raid_disk >=0 &&
2265 !test_bit(Faulty, &rdev->flags))
2267 /* Device turned faulty? */
2268 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2272 /* Check if any mddev parameters have changed */
2273 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2274 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2275 (mddev->layout != le64_to_cpu(sb->layout)) ||
2276 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2277 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2283 void md_update_sb(struct mddev *mddev, int force_change)
2285 struct md_rdev *rdev;
2288 int any_badblocks_changed = 0;
2293 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2298 if (mddev_is_clustered(mddev)) {
2299 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2301 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2303 ret = md_cluster_ops->metadata_update_start(mddev);
2304 /* Has someone else has updated the sb */
2305 if (!does_sb_need_changing(mddev)) {
2307 md_cluster_ops->metadata_update_cancel(mddev);
2308 bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2309 BIT(MD_CHANGE_DEVS) |
2310 BIT(MD_CHANGE_CLEAN));
2315 /* First make sure individual recovery_offsets are correct */
2316 rdev_for_each(rdev, mddev) {
2317 if (rdev->raid_disk >= 0 &&
2318 mddev->delta_disks >= 0 &&
2319 !test_bit(Journal, &rdev->flags) &&
2320 !test_bit(In_sync, &rdev->flags) &&
2321 mddev->curr_resync_completed > rdev->recovery_offset)
2322 rdev->recovery_offset = mddev->curr_resync_completed;
2325 if (!mddev->persistent) {
2326 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2327 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2328 if (!mddev->external) {
2329 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2330 rdev_for_each(rdev, mddev) {
2331 if (rdev->badblocks.changed) {
2332 rdev->badblocks.changed = 0;
2333 ack_all_badblocks(&rdev->badblocks);
2334 md_error(mddev, rdev);
2336 clear_bit(Blocked, &rdev->flags);
2337 clear_bit(BlockedBadBlocks, &rdev->flags);
2338 wake_up(&rdev->blocked_wait);
2341 wake_up(&mddev->sb_wait);
2345 spin_lock(&mddev->lock);
2347 mddev->utime = ktime_get_real_seconds();
2349 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2351 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2352 /* just a clean<-> dirty transition, possibly leave spares alone,
2353 * though if events isn't the right even/odd, we will have to do
2359 if (mddev->degraded)
2360 /* If the array is degraded, then skipping spares is both
2361 * dangerous and fairly pointless.
2362 * Dangerous because a device that was removed from the array
2363 * might have a event_count that still looks up-to-date,
2364 * so it can be re-added without a resync.
2365 * Pointless because if there are any spares to skip,
2366 * then a recovery will happen and soon that array won't
2367 * be degraded any more and the spare can go back to sleep then.
2371 sync_req = mddev->in_sync;
2373 /* If this is just a dirty<->clean transition, and the array is clean
2374 * and 'events' is odd, we can roll back to the previous clean state */
2376 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2377 && mddev->can_decrease_events
2378 && mddev->events != 1) {
2380 mddev->can_decrease_events = 0;
2382 /* otherwise we have to go forward and ... */
2384 mddev->can_decrease_events = nospares;
2388 * This 64-bit counter should never wrap.
2389 * Either we are in around ~1 trillion A.C., assuming
2390 * 1 reboot per second, or we have a bug...
2392 WARN_ON(mddev->events == 0);
2394 rdev_for_each(rdev, mddev) {
2395 if (rdev->badblocks.changed)
2396 any_badblocks_changed++;
2397 if (test_bit(Faulty, &rdev->flags))
2398 set_bit(FaultRecorded, &rdev->flags);
2401 sync_sbs(mddev, nospares);
2402 spin_unlock(&mddev->lock);
2404 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2405 mdname(mddev), mddev->in_sync);
2408 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2409 bitmap_update_sb(mddev->bitmap);
2410 rdev_for_each(rdev, mddev) {
2411 char b[BDEVNAME_SIZE];
2413 if (rdev->sb_loaded != 1)
2414 continue; /* no noise on spare devices */
2416 if (!test_bit(Faulty, &rdev->flags)) {
2417 md_super_write(mddev,rdev,
2418 rdev->sb_start, rdev->sb_size,
2420 pr_debug("md: (write) %s's sb offset: %llu\n",
2421 bdevname(rdev->bdev, b),
2422 (unsigned long long)rdev->sb_start);
2423 rdev->sb_events = mddev->events;
2424 if (rdev->badblocks.size) {
2425 md_super_write(mddev, rdev,
2426 rdev->badblocks.sector,
2427 rdev->badblocks.size << 9,
2429 rdev->badblocks.size = 0;
2433 pr_debug("md: %s (skipping faulty)\n",
2434 bdevname(rdev->bdev, b));
2436 if (mddev->level == LEVEL_MULTIPATH)
2437 /* only need to write one superblock... */
2440 md_super_wait(mddev);
2441 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2443 if (mddev_is_clustered(mddev) && ret == 0)
2444 md_cluster_ops->metadata_update_finish(mddev);
2446 if (mddev->in_sync != sync_req ||
2447 !bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2448 BIT(MD_CHANGE_DEVS) | BIT(MD_CHANGE_CLEAN)))
2449 /* have to write it out again */
2451 wake_up(&mddev->sb_wait);
2452 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2453 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2455 rdev_for_each(rdev, mddev) {
2456 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2457 clear_bit(Blocked, &rdev->flags);
2459 if (any_badblocks_changed)
2460 ack_all_badblocks(&rdev->badblocks);
2461 clear_bit(BlockedBadBlocks, &rdev->flags);
2462 wake_up(&rdev->blocked_wait);
2465 EXPORT_SYMBOL(md_update_sb);
2467 static int add_bound_rdev(struct md_rdev *rdev)
2469 struct mddev *mddev = rdev->mddev;
2471 bool add_journal = test_bit(Journal, &rdev->flags);
2473 if (!mddev->pers->hot_remove_disk || add_journal) {
2474 /* If there is hot_add_disk but no hot_remove_disk
2475 * then added disks for geometry changes,
2476 * and should be added immediately.
2478 super_types[mddev->major_version].
2479 validate_super(mddev, rdev);
2481 mddev_suspend(mddev);
2482 err = mddev->pers->hot_add_disk(mddev, rdev);
2484 mddev_resume(mddev);
2486 md_kick_rdev_from_array(rdev);
2490 sysfs_notify_dirent_safe(rdev->sysfs_state);
2492 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2493 if (mddev->degraded)
2494 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2495 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2496 md_new_event(mddev);
2497 md_wakeup_thread(mddev->thread);
2501 /* words written to sysfs files may, or may not, be \n terminated.
2502 * We want to accept with case. For this we use cmd_match.
2504 static int cmd_match(const char *cmd, const char *str)
2506 /* See if cmd, written into a sysfs file, matches
2507 * str. They must either be the same, or cmd can
2508 * have a trailing newline
2510 while (*cmd && *str && *cmd == *str) {
2521 struct rdev_sysfs_entry {
2522 struct attribute attr;
2523 ssize_t (*show)(struct md_rdev *, char *);
2524 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2528 state_show(struct md_rdev *rdev, char *page)
2532 unsigned long flags = ACCESS_ONCE(rdev->flags);
2534 if (test_bit(Faulty, &flags) ||
2535 (!test_bit(ExternalBbl, &flags) &&
2536 rdev->badblocks.unacked_exist))
2537 len += sprintf(page+len, "faulty%s", sep);
2538 if (test_bit(In_sync, &flags))
2539 len += sprintf(page+len, "in_sync%s", sep);
2540 if (test_bit(Journal, &flags))
2541 len += sprintf(page+len, "journal%s", sep);
2542 if (test_bit(WriteMostly, &flags))
2543 len += sprintf(page+len, "write_mostly%s", sep);
2544 if (test_bit(Blocked, &flags) ||
2545 (rdev->badblocks.unacked_exist
2546 && !test_bit(Faulty, &flags)))
2547 len += sprintf(page+len, "blocked%s", sep);
2548 if (!test_bit(Faulty, &flags) &&
2549 !test_bit(Journal, &flags) &&
2550 !test_bit(In_sync, &flags))
2551 len += sprintf(page+len, "spare%s", sep);
2552 if (test_bit(WriteErrorSeen, &flags))
2553 len += sprintf(page+len, "write_error%s", sep);
2554 if (test_bit(WantReplacement, &flags))
2555 len += sprintf(page+len, "want_replacement%s", sep);
2556 if (test_bit(Replacement, &flags))
2557 len += sprintf(page+len, "replacement%s", sep);
2558 if (test_bit(ExternalBbl, &flags))
2559 len += sprintf(page+len, "external_bbl%s", sep);
2564 return len+sprintf(page+len, "\n");
2568 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2571 * faulty - simulates an error
2572 * remove - disconnects the device
2573 * writemostly - sets write_mostly
2574 * -writemostly - clears write_mostly
2575 * blocked - sets the Blocked flags
2576 * -blocked - clears the Blocked and possibly simulates an error
2577 * insync - sets Insync providing device isn't active
2578 * -insync - clear Insync for a device with a slot assigned,
2579 * so that it gets rebuilt based on bitmap
2580 * write_error - sets WriteErrorSeen
2581 * -write_error - clears WriteErrorSeen
2584 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2585 md_error(rdev->mddev, rdev);
2586 if (test_bit(Faulty, &rdev->flags))
2590 } else if (cmd_match(buf, "remove")) {
2591 if (rdev->mddev->pers) {
2592 clear_bit(Blocked, &rdev->flags);
2593 remove_and_add_spares(rdev->mddev, rdev);
2595 if (rdev->raid_disk >= 0)
2598 struct mddev *mddev = rdev->mddev;
2600 if (mddev_is_clustered(mddev))
2601 err = md_cluster_ops->remove_disk(mddev, rdev);
2604 md_kick_rdev_from_array(rdev);
2606 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2607 md_wakeup_thread(mddev->thread);
2609 md_new_event(mddev);
2612 } else if (cmd_match(buf, "writemostly")) {
2613 set_bit(WriteMostly, &rdev->flags);
2615 } else if (cmd_match(buf, "-writemostly")) {
2616 clear_bit(WriteMostly, &rdev->flags);
2618 } else if (cmd_match(buf, "blocked")) {
2619 set_bit(Blocked, &rdev->flags);
2621 } else if (cmd_match(buf, "-blocked")) {
2622 if (!test_bit(Faulty, &rdev->flags) &&
2623 !test_bit(ExternalBbl, &rdev->flags) &&
2624 rdev->badblocks.unacked_exist) {
2625 /* metadata handler doesn't understand badblocks,
2626 * so we need to fail the device
2628 md_error(rdev->mddev, rdev);
2630 clear_bit(Blocked, &rdev->flags);
2631 clear_bit(BlockedBadBlocks, &rdev->flags);
2632 wake_up(&rdev->blocked_wait);
2633 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2634 md_wakeup_thread(rdev->mddev->thread);
2637 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2638 set_bit(In_sync, &rdev->flags);
2640 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2641 !test_bit(Journal, &rdev->flags)) {
2642 if (rdev->mddev->pers == NULL) {
2643 clear_bit(In_sync, &rdev->flags);
2644 rdev->saved_raid_disk = rdev->raid_disk;
2645 rdev->raid_disk = -1;
2648 } else if (cmd_match(buf, "write_error")) {
2649 set_bit(WriteErrorSeen, &rdev->flags);
2651 } else if (cmd_match(buf, "-write_error")) {
2652 clear_bit(WriteErrorSeen, &rdev->flags);
2654 } else if (cmd_match(buf, "want_replacement")) {
2655 /* Any non-spare device that is not a replacement can
2656 * become want_replacement at any time, but we then need to
2657 * check if recovery is needed.
2659 if (rdev->raid_disk >= 0 &&
2660 !test_bit(Journal, &rdev->flags) &&
2661 !test_bit(Replacement, &rdev->flags))
2662 set_bit(WantReplacement, &rdev->flags);
2663 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2664 md_wakeup_thread(rdev->mddev->thread);
2666 } else if (cmd_match(buf, "-want_replacement")) {
2667 /* Clearing 'want_replacement' is always allowed.
2668 * Once replacements starts it is too late though.
2671 clear_bit(WantReplacement, &rdev->flags);
2672 } else if (cmd_match(buf, "replacement")) {
2673 /* Can only set a device as a replacement when array has not
2674 * yet been started. Once running, replacement is automatic
2675 * from spares, or by assigning 'slot'.
2677 if (rdev->mddev->pers)
2680 set_bit(Replacement, &rdev->flags);
2683 } else if (cmd_match(buf, "-replacement")) {
2684 /* Similarly, can only clear Replacement before start */
2685 if (rdev->mddev->pers)
2688 clear_bit(Replacement, &rdev->flags);
2691 } else if (cmd_match(buf, "re-add")) {
2692 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2693 /* clear_bit is performed _after_ all the devices
2694 * have their local Faulty bit cleared. If any writes
2695 * happen in the meantime in the local node, they
2696 * will land in the local bitmap, which will be synced
2697 * by this node eventually
2699 if (!mddev_is_clustered(rdev->mddev) ||
2700 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2701 clear_bit(Faulty, &rdev->flags);
2702 err = add_bound_rdev(rdev);
2706 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2707 set_bit(ExternalBbl, &rdev->flags);
2708 rdev->badblocks.shift = 0;
2710 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2711 clear_bit(ExternalBbl, &rdev->flags);
2715 sysfs_notify_dirent_safe(rdev->sysfs_state);
2716 return err ? err : len;
2718 static struct rdev_sysfs_entry rdev_state =
2719 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2722 errors_show(struct md_rdev *rdev, char *page)
2724 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2728 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2733 rv = kstrtouint(buf, 10, &n);
2736 atomic_set(&rdev->corrected_errors, n);
2739 static struct rdev_sysfs_entry rdev_errors =
2740 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2743 slot_show(struct md_rdev *rdev, char *page)
2745 if (test_bit(Journal, &rdev->flags))
2746 return sprintf(page, "journal\n");
2747 else if (rdev->raid_disk < 0)
2748 return sprintf(page, "none\n");
2750 return sprintf(page, "%d\n", rdev->raid_disk);
2754 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2759 if (test_bit(Journal, &rdev->flags))
2761 if (strncmp(buf, "none", 4)==0)
2764 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2768 if (rdev->mddev->pers && slot == -1) {
2769 /* Setting 'slot' on an active array requires also
2770 * updating the 'rd%d' link, and communicating
2771 * with the personality with ->hot_*_disk.
2772 * For now we only support removing
2773 * failed/spare devices. This normally happens automatically,
2774 * but not when the metadata is externally managed.
2776 if (rdev->raid_disk == -1)
2778 /* personality does all needed checks */
2779 if (rdev->mddev->pers->hot_remove_disk == NULL)
2781 clear_bit(Blocked, &rdev->flags);
2782 remove_and_add_spares(rdev->mddev, rdev);
2783 if (rdev->raid_disk >= 0)
2785 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2786 md_wakeup_thread(rdev->mddev->thread);
2787 } else if (rdev->mddev->pers) {
2788 /* Activating a spare .. or possibly reactivating
2789 * if we ever get bitmaps working here.
2793 if (rdev->raid_disk != -1)
2796 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2799 if (rdev->mddev->pers->hot_add_disk == NULL)
2802 if (slot >= rdev->mddev->raid_disks &&
2803 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2806 rdev->raid_disk = slot;
2807 if (test_bit(In_sync, &rdev->flags))
2808 rdev->saved_raid_disk = slot;
2810 rdev->saved_raid_disk = -1;
2811 clear_bit(In_sync, &rdev->flags);
2812 clear_bit(Bitmap_sync, &rdev->flags);
2813 err = rdev->mddev->pers->
2814 hot_add_disk(rdev->mddev, rdev);
2816 rdev->raid_disk = -1;
2819 sysfs_notify_dirent_safe(rdev->sysfs_state);
2820 if (sysfs_link_rdev(rdev->mddev, rdev))
2821 /* failure here is OK */;
2822 /* don't wakeup anyone, leave that to userspace. */
2824 if (slot >= rdev->mddev->raid_disks &&
2825 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2827 rdev->raid_disk = slot;
2828 /* assume it is working */
2829 clear_bit(Faulty, &rdev->flags);
2830 clear_bit(WriteMostly, &rdev->flags);
2831 set_bit(In_sync, &rdev->flags);
2832 sysfs_notify_dirent_safe(rdev->sysfs_state);
2837 static struct rdev_sysfs_entry rdev_slot =
2838 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2841 offset_show(struct md_rdev *rdev, char *page)
2843 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2847 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2849 unsigned long long offset;
2850 if (kstrtoull(buf, 10, &offset) < 0)
2852 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2854 if (rdev->sectors && rdev->mddev->external)
2855 /* Must set offset before size, so overlap checks
2858 rdev->data_offset = offset;
2859 rdev->new_data_offset = offset;
2863 static struct rdev_sysfs_entry rdev_offset =
2864 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2866 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2868 return sprintf(page, "%llu\n",
2869 (unsigned long long)rdev->new_data_offset);
2872 static ssize_t new_offset_store(struct md_rdev *rdev,
2873 const char *buf, size_t len)
2875 unsigned long long new_offset;
2876 struct mddev *mddev = rdev->mddev;
2878 if (kstrtoull(buf, 10, &new_offset) < 0)
2881 if (mddev->sync_thread ||
2882 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2884 if (new_offset == rdev->data_offset)
2885 /* reset is always permitted */
2887 else if (new_offset > rdev->data_offset) {
2888 /* must not push array size beyond rdev_sectors */
2889 if (new_offset - rdev->data_offset
2890 + mddev->dev_sectors > rdev->sectors)
2893 /* Metadata worries about other space details. */
2895 /* decreasing the offset is inconsistent with a backwards
2898 if (new_offset < rdev->data_offset &&
2899 mddev->reshape_backwards)
2901 /* Increasing offset is inconsistent with forwards
2902 * reshape. reshape_direction should be set to
2903 * 'backwards' first.
2905 if (new_offset > rdev->data_offset &&
2906 !mddev->reshape_backwards)
2909 if (mddev->pers && mddev->persistent &&
2910 !super_types[mddev->major_version]
2911 .allow_new_offset(rdev, new_offset))
2913 rdev->new_data_offset = new_offset;
2914 if (new_offset > rdev->data_offset)
2915 mddev->reshape_backwards = 1;
2916 else if (new_offset < rdev->data_offset)
2917 mddev->reshape_backwards = 0;
2921 static struct rdev_sysfs_entry rdev_new_offset =
2922 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2925 rdev_size_show(struct md_rdev *rdev, char *page)
2927 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2930 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2932 /* check if two start/length pairs overlap */
2940 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2942 unsigned long long blocks;
2945 if (kstrtoull(buf, 10, &blocks) < 0)
2948 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2949 return -EINVAL; /* sector conversion overflow */
2952 if (new != blocks * 2)
2953 return -EINVAL; /* unsigned long long to sector_t overflow */
2960 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2962 struct mddev *my_mddev = rdev->mddev;
2963 sector_t oldsectors = rdev->sectors;
2966 if (test_bit(Journal, &rdev->flags))
2968 if (strict_blocks_to_sectors(buf, §ors) < 0)
2970 if (rdev->data_offset != rdev->new_data_offset)
2971 return -EINVAL; /* too confusing */
2972 if (my_mddev->pers && rdev->raid_disk >= 0) {
2973 if (my_mddev->persistent) {
2974 sectors = super_types[my_mddev->major_version].
2975 rdev_size_change(rdev, sectors);
2978 } else if (!sectors)
2979 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2981 if (!my_mddev->pers->resize)
2982 /* Cannot change size for RAID0 or Linear etc */
2985 if (sectors < my_mddev->dev_sectors)
2986 return -EINVAL; /* component must fit device */
2988 rdev->sectors = sectors;
2989 if (sectors > oldsectors && my_mddev->external) {
2990 /* Need to check that all other rdevs with the same
2991 * ->bdev do not overlap. 'rcu' is sufficient to walk
2992 * the rdev lists safely.
2993 * This check does not provide a hard guarantee, it
2994 * just helps avoid dangerous mistakes.
2996 struct mddev *mddev;
2998 struct list_head *tmp;
3001 for_each_mddev(mddev, tmp) {
3002 struct md_rdev *rdev2;
3004 rdev_for_each(rdev2, mddev)
3005 if (rdev->bdev == rdev2->bdev &&
3007 overlaps(rdev->data_offset, rdev->sectors,
3020 /* Someone else could have slipped in a size
3021 * change here, but doing so is just silly.
3022 * We put oldsectors back because we *know* it is
3023 * safe, and trust userspace not to race with
3026 rdev->sectors = oldsectors;
3033 static struct rdev_sysfs_entry rdev_size =
3034 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3036 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3038 unsigned long long recovery_start = rdev->recovery_offset;
3040 if (test_bit(In_sync, &rdev->flags) ||
3041 recovery_start == MaxSector)
3042 return sprintf(page, "none\n");
3044 return sprintf(page, "%llu\n", recovery_start);
3047 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3049 unsigned long long recovery_start;
3051 if (cmd_match(buf, "none"))
3052 recovery_start = MaxSector;
3053 else if (kstrtoull(buf, 10, &recovery_start))
3056 if (rdev->mddev->pers &&
3057 rdev->raid_disk >= 0)
3060 rdev->recovery_offset = recovery_start;
3061 if (recovery_start == MaxSector)
3062 set_bit(In_sync, &rdev->flags);
3064 clear_bit(In_sync, &rdev->flags);
3068 static struct rdev_sysfs_entry rdev_recovery_start =
3069 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3071 /* sysfs access to bad-blocks list.
3072 * We present two files.
3073 * 'bad-blocks' lists sector numbers and lengths of ranges that
3074 * are recorded as bad. The list is truncated to fit within
3075 * the one-page limit of sysfs.
3076 * Writing "sector length" to this file adds an acknowledged
3078 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3079 * been acknowledged. Writing to this file adds bad blocks
3080 * without acknowledging them. This is largely for testing.
3082 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3084 return badblocks_show(&rdev->badblocks, page, 0);
3086 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3088 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3089 /* Maybe that ack was all we needed */
3090 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3091 wake_up(&rdev->blocked_wait);
3094 static struct rdev_sysfs_entry rdev_bad_blocks =
3095 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3097 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3099 return badblocks_show(&rdev->badblocks, page, 1);
3101 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3103 return badblocks_store(&rdev->badblocks, page, len, 1);
3105 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3106 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3108 static struct attribute *rdev_default_attrs[] = {
3113 &rdev_new_offset.attr,
3115 &rdev_recovery_start.attr,
3116 &rdev_bad_blocks.attr,
3117 &rdev_unack_bad_blocks.attr,
3121 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3123 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3124 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3130 return entry->show(rdev, page);
3134 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3135 const char *page, size_t length)
3137 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3138 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3140 struct mddev *mddev = rdev->mddev;
3144 if (!capable(CAP_SYS_ADMIN))
3146 rv = mddev ? mddev_lock(mddev): -EBUSY;
3148 if (rdev->mddev == NULL)
3151 rv = entry->store(rdev, page, length);
3152 mddev_unlock(mddev);
3157 static void rdev_free(struct kobject *ko)
3159 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3162 static const struct sysfs_ops rdev_sysfs_ops = {
3163 .show = rdev_attr_show,
3164 .store = rdev_attr_store,
3166 static struct kobj_type rdev_ktype = {
3167 .release = rdev_free,
3168 .sysfs_ops = &rdev_sysfs_ops,
3169 .default_attrs = rdev_default_attrs,
3172 int md_rdev_init(struct md_rdev *rdev)
3175 rdev->saved_raid_disk = -1;
3176 rdev->raid_disk = -1;
3178 rdev->data_offset = 0;
3179 rdev->new_data_offset = 0;
3180 rdev->sb_events = 0;
3181 rdev->last_read_error = 0;
3182 rdev->sb_loaded = 0;
3183 rdev->bb_page = NULL;
3184 atomic_set(&rdev->nr_pending, 0);
3185 atomic_set(&rdev->read_errors, 0);
3186 atomic_set(&rdev->corrected_errors, 0);
3188 INIT_LIST_HEAD(&rdev->same_set);
3189 init_waitqueue_head(&rdev->blocked_wait);
3191 /* Add space to store bad block list.
3192 * This reserves the space even on arrays where it cannot
3193 * be used - I wonder if that matters
3195 return badblocks_init(&rdev->badblocks, 0);
3197 EXPORT_SYMBOL_GPL(md_rdev_init);
3199 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3201 * mark the device faulty if:
3203 * - the device is nonexistent (zero size)
3204 * - the device has no valid superblock
3206 * a faulty rdev _never_ has rdev->sb set.
3208 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3210 char b[BDEVNAME_SIZE];
3212 struct md_rdev *rdev;
3215 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3217 return ERR_PTR(-ENOMEM);
3219 err = md_rdev_init(rdev);
3222 err = alloc_disk_sb(rdev);
3226 err = lock_rdev(rdev, newdev, super_format == -2);
3230 kobject_init(&rdev->kobj, &rdev_ktype);
3232 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3234 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3235 bdevname(rdev->bdev,b));
3240 if (super_format >= 0) {
3241 err = super_types[super_format].
3242 load_super(rdev, NULL, super_minor);
3243 if (err == -EINVAL) {
3244 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3245 bdevname(rdev->bdev,b),
3246 super_format, super_minor);
3250 pr_warn("md: could not read %s's sb, not importing!\n",
3251 bdevname(rdev->bdev,b));
3261 md_rdev_clear(rdev);
3263 return ERR_PTR(err);
3267 * Check a full RAID array for plausibility
3270 static void analyze_sbs(struct mddev *mddev)
3273 struct md_rdev *rdev, *freshest, *tmp;
3274 char b[BDEVNAME_SIZE];
3277 rdev_for_each_safe(rdev, tmp, mddev)
3278 switch (super_types[mddev->major_version].
3279 load_super(rdev, freshest, mddev->minor_version)) {
3286 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3287 bdevname(rdev->bdev,b));
3288 md_kick_rdev_from_array(rdev);
3291 super_types[mddev->major_version].
3292 validate_super(mddev, freshest);
3295 rdev_for_each_safe(rdev, tmp, mddev) {
3296 if (mddev->max_disks &&
3297 (rdev->desc_nr >= mddev->max_disks ||
3298 i > mddev->max_disks)) {
3299 pr_warn("md: %s: %s: only %d devices permitted\n",
3300 mdname(mddev), bdevname(rdev->bdev, b),
3302 md_kick_rdev_from_array(rdev);
3305 if (rdev != freshest) {
3306 if (super_types[mddev->major_version].
3307 validate_super(mddev, rdev)) {
3308 pr_warn("md: kicking non-fresh %s from array!\n",
3309 bdevname(rdev->bdev,b));
3310 md_kick_rdev_from_array(rdev);
3314 if (mddev->level == LEVEL_MULTIPATH) {
3315 rdev->desc_nr = i++;
3316 rdev->raid_disk = rdev->desc_nr;
3317 set_bit(In_sync, &rdev->flags);
3318 } else if (rdev->raid_disk >=
3319 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3320 !test_bit(Journal, &rdev->flags)) {
3321 rdev->raid_disk = -1;
3322 clear_bit(In_sync, &rdev->flags);
3327 /* Read a fixed-point number.
3328 * Numbers in sysfs attributes should be in "standard" units where
3329 * possible, so time should be in seconds.
3330 * However we internally use a a much smaller unit such as
3331 * milliseconds or jiffies.
3332 * This function takes a decimal number with a possible fractional
3333 * component, and produces an integer which is the result of
3334 * multiplying that number by 10^'scale'.
3335 * all without any floating-point arithmetic.
3337 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3339 unsigned long result = 0;
3341 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3344 else if (decimals < scale) {
3347 result = result * 10 + value;
3359 while (decimals < scale) {
3368 safe_delay_show(struct mddev *mddev, char *page)
3370 int msec = (mddev->safemode_delay*1000)/HZ;
3371 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3374 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3378 if (mddev_is_clustered(mddev)) {
3379 pr_warn("md: Safemode is disabled for clustered mode\n");
3383 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3386 mddev->safemode_delay = 0;
3388 unsigned long old_delay = mddev->safemode_delay;
3389 unsigned long new_delay = (msec*HZ)/1000;
3393 mddev->safemode_delay = new_delay;
3394 if (new_delay < old_delay || old_delay == 0)
3395 mod_timer(&mddev->safemode_timer, jiffies+1);
3399 static struct md_sysfs_entry md_safe_delay =
3400 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3403 level_show(struct mddev *mddev, char *page)
3405 struct md_personality *p;
3407 spin_lock(&mddev->lock);
3410 ret = sprintf(page, "%s\n", p->name);
3411 else if (mddev->clevel[0])
3412 ret = sprintf(page, "%s\n", mddev->clevel);
3413 else if (mddev->level != LEVEL_NONE)
3414 ret = sprintf(page, "%d\n", mddev->level);
3417 spin_unlock(&mddev->lock);
3422 level_store(struct mddev *mddev, const char *buf, size_t len)
3427 struct md_personality *pers, *oldpers;
3429 void *priv, *oldpriv;
3430 struct md_rdev *rdev;
3432 if (slen == 0 || slen >= sizeof(clevel))
3435 rv = mddev_lock(mddev);
3439 if (mddev->pers == NULL) {
3440 strncpy(mddev->clevel, buf, slen);
3441 if (mddev->clevel[slen-1] == '\n')
3443 mddev->clevel[slen] = 0;
3444 mddev->level = LEVEL_NONE;
3452 /* request to change the personality. Need to ensure:
3453 * - array is not engaged in resync/recovery/reshape
3454 * - old personality can be suspended
3455 * - new personality will access other array.
3459 if (mddev->sync_thread ||
3460 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3461 mddev->reshape_position != MaxSector ||
3462 mddev->sysfs_active)
3466 if (!mddev->pers->quiesce) {
3467 pr_warn("md: %s: %s does not support online personality change\n",
3468 mdname(mddev), mddev->pers->name);
3472 /* Now find the new personality */
3473 strncpy(clevel, buf, slen);
3474 if (clevel[slen-1] == '\n')
3477 if (kstrtol(clevel, 10, &level))
3480 if (request_module("md-%s", clevel) != 0)
3481 request_module("md-level-%s", clevel);
3482 spin_lock(&pers_lock);
3483 pers = find_pers(level, clevel);
3484 if (!pers || !try_module_get(pers->owner)) {
3485 spin_unlock(&pers_lock);
3486 pr_warn("md: personality %s not loaded\n", clevel);
3490 spin_unlock(&pers_lock);
3492 if (pers == mddev->pers) {
3493 /* Nothing to do! */
3494 module_put(pers->owner);
3498 if (!pers->takeover) {
3499 module_put(pers->owner);
3500 pr_warn("md: %s: %s does not support personality takeover\n",
3501 mdname(mddev), clevel);
3506 rdev_for_each(rdev, mddev)
3507 rdev->new_raid_disk = rdev->raid_disk;
3509 /* ->takeover must set new_* and/or delta_disks
3510 * if it succeeds, and may set them when it fails.
3512 priv = pers->takeover(mddev);
3514 mddev->new_level = mddev->level;
3515 mddev->new_layout = mddev->layout;
3516 mddev->new_chunk_sectors = mddev->chunk_sectors;
3517 mddev->raid_disks -= mddev->delta_disks;
3518 mddev->delta_disks = 0;
3519 mddev->reshape_backwards = 0;
3520 module_put(pers->owner);
3521 pr_warn("md: %s: %s would not accept array\n",
3522 mdname(mddev), clevel);
3527 /* Looks like we have a winner */
3528 mddev_suspend(mddev);
3529 mddev_detach(mddev);
3531 spin_lock(&mddev->lock);
3532 oldpers = mddev->pers;
3533 oldpriv = mddev->private;
3535 mddev->private = priv;
3536 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3537 mddev->level = mddev->new_level;
3538 mddev->layout = mddev->new_layout;
3539 mddev->chunk_sectors = mddev->new_chunk_sectors;
3540 mddev->delta_disks = 0;
3541 mddev->reshape_backwards = 0;
3542 mddev->degraded = 0;
3543 spin_unlock(&mddev->lock);
3545 if (oldpers->sync_request == NULL &&
3547 /* We are converting from a no-redundancy array
3548 * to a redundancy array and metadata is managed
3549 * externally so we need to be sure that writes
3550 * won't block due to a need to transition
3552 * until external management is started.
3555 mddev->safemode_delay = 0;
3556 mddev->safemode = 0;
3559 oldpers->free(mddev, oldpriv);
3561 if (oldpers->sync_request == NULL &&
3562 pers->sync_request != NULL) {
3563 /* need to add the md_redundancy_group */
3564 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3565 pr_warn("md: cannot register extra attributes for %s\n",
3567 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3569 if (oldpers->sync_request != NULL &&
3570 pers->sync_request == NULL) {
3571 /* need to remove the md_redundancy_group */
3572 if (mddev->to_remove == NULL)
3573 mddev->to_remove = &md_redundancy_group;
3576 module_put(oldpers->owner);
3578 rdev_for_each(rdev, mddev) {
3579 if (rdev->raid_disk < 0)
3581 if (rdev->new_raid_disk >= mddev->raid_disks)
3582 rdev->new_raid_disk = -1;
3583 if (rdev->new_raid_disk == rdev->raid_disk)
3585 sysfs_unlink_rdev(mddev, rdev);
3587 rdev_for_each(rdev, mddev) {
3588 if (rdev->raid_disk < 0)
3590 if (rdev->new_raid_disk == rdev->raid_disk)
3592 rdev->raid_disk = rdev->new_raid_disk;
3593 if (rdev->raid_disk < 0)
3594 clear_bit(In_sync, &rdev->flags);
3596 if (sysfs_link_rdev(mddev, rdev))
3597 pr_warn("md: cannot register rd%d for %s after level change\n",
3598 rdev->raid_disk, mdname(mddev));
3602 if (pers->sync_request == NULL) {
3603 /* this is now an array without redundancy, so
3604 * it must always be in_sync
3607 del_timer_sync(&mddev->safemode_timer);
3609 blk_set_stacking_limits(&mddev->queue->limits);
3611 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3612 mddev_resume(mddev);
3614 md_update_sb(mddev, 1);
3615 sysfs_notify(&mddev->kobj, NULL, "level");
3616 md_new_event(mddev);
3619 mddev_unlock(mddev);
3623 static struct md_sysfs_entry md_level =
3624 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3627 layout_show(struct mddev *mddev, char *page)
3629 /* just a number, not meaningful for all levels */
3630 if (mddev->reshape_position != MaxSector &&
3631 mddev->layout != mddev->new_layout)
3632 return sprintf(page, "%d (%d)\n",
3633 mddev->new_layout, mddev->layout);
3634 return sprintf(page, "%d\n", mddev->layout);
3638 layout_store(struct mddev *mddev, const char *buf, size_t len)
3643 err = kstrtouint(buf, 10, &n);
3646 err = mddev_lock(mddev);
3651 if (mddev->pers->check_reshape == NULL)
3656 mddev->new_layout = n;
3657 err = mddev->pers->check_reshape(mddev);
3659 mddev->new_layout = mddev->layout;
3662 mddev->new_layout = n;
3663 if (mddev->reshape_position == MaxSector)
3666 mddev_unlock(mddev);
3669 static struct md_sysfs_entry md_layout =
3670 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3673 raid_disks_show(struct mddev *mddev, char *page)
3675 if (mddev->raid_disks == 0)
3677 if (mddev->reshape_position != MaxSector &&
3678 mddev->delta_disks != 0)
3679 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3680 mddev->raid_disks - mddev->delta_disks);
3681 return sprintf(page, "%d\n", mddev->raid_disks);
3684 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3687 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3692 err = kstrtouint(buf, 10, &n);
3696 err = mddev_lock(mddev);
3700 err = update_raid_disks(mddev, n);
3701 else if (mddev->reshape_position != MaxSector) {
3702 struct md_rdev *rdev;
3703 int olddisks = mddev->raid_disks - mddev->delta_disks;
3706 rdev_for_each(rdev, mddev) {
3708 rdev->data_offset < rdev->new_data_offset)
3711 rdev->data_offset > rdev->new_data_offset)
3715 mddev->delta_disks = n - olddisks;
3716 mddev->raid_disks = n;
3717 mddev->reshape_backwards = (mddev->delta_disks < 0);
3719 mddev->raid_disks = n;
3721 mddev_unlock(mddev);
3722 return err ? err : len;
3724 static struct md_sysfs_entry md_raid_disks =
3725 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3728 chunk_size_show(struct mddev *mddev, char *page)
3730 if (mddev->reshape_position != MaxSector &&
3731 mddev->chunk_sectors != mddev->new_chunk_sectors)
3732 return sprintf(page, "%d (%d)\n",
3733 mddev->new_chunk_sectors << 9,
3734 mddev->chunk_sectors << 9);
3735 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3739 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3744 err = kstrtoul(buf, 10, &n);
3748 err = mddev_lock(mddev);
3752 if (mddev->pers->check_reshape == NULL)
3757 mddev->new_chunk_sectors = n >> 9;
3758 err = mddev->pers->check_reshape(mddev);
3760 mddev->new_chunk_sectors = mddev->chunk_sectors;
3763 mddev->new_chunk_sectors = n >> 9;
3764 if (mddev->reshape_position == MaxSector)
3765 mddev->chunk_sectors = n >> 9;
3767 mddev_unlock(mddev);
3770 static struct md_sysfs_entry md_chunk_size =
3771 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3774 resync_start_show(struct mddev *mddev, char *page)
3776 if (mddev->recovery_cp == MaxSector)
3777 return sprintf(page, "none\n");
3778 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3782 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3784 unsigned long long n;
3787 if (cmd_match(buf, "none"))
3790 err = kstrtoull(buf, 10, &n);
3793 if (n != (sector_t)n)
3797 err = mddev_lock(mddev);
3800 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3804 mddev->recovery_cp = n;
3806 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3808 mddev_unlock(mddev);
3811 static struct md_sysfs_entry md_resync_start =
3812 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3813 resync_start_show, resync_start_store);
3816 * The array state can be:
3819 * No devices, no size, no level
3820 * Equivalent to STOP_ARRAY ioctl
3822 * May have some settings, but array is not active
3823 * all IO results in error
3824 * When written, doesn't tear down array, but just stops it
3825 * suspended (not supported yet)
3826 * All IO requests will block. The array can be reconfigured.
3827 * Writing this, if accepted, will block until array is quiescent
3829 * no resync can happen. no superblocks get written.
3830 * write requests fail
3832 * like readonly, but behaves like 'clean' on a write request.
3834 * clean - no pending writes, but otherwise active.
3835 * When written to inactive array, starts without resync
3836 * If a write request arrives then
3837 * if metadata is known, mark 'dirty' and switch to 'active'.
3838 * if not known, block and switch to write-pending
3839 * If written to an active array that has pending writes, then fails.
3841 * fully active: IO and resync can be happening.
3842 * When written to inactive array, starts with resync
3845 * clean, but writes are blocked waiting for 'active' to be written.
3848 * like active, but no writes have been seen for a while (100msec).
3851 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3852 write_pending, active_idle, bad_word};
3853 static char *array_states[] = {
3854 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3855 "write-pending", "active-idle", NULL };
3857 static int match_word(const char *word, char **list)
3860 for (n=0; list[n]; n++)
3861 if (cmd_match(word, list[n]))
3867 array_state_show(struct mddev *mddev, char *page)
3869 enum array_state st = inactive;
3880 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3882 else if (mddev->in_sync)
3884 else if (mddev->safemode)
3890 if (list_empty(&mddev->disks) &&
3891 mddev->raid_disks == 0 &&
3892 mddev->dev_sectors == 0)
3897 return sprintf(page, "%s\n", array_states[st]);
3900 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3901 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3902 static int do_md_run(struct mddev *mddev);
3903 static int restart_array(struct mddev *mddev);
3906 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3909 enum array_state st = match_word(buf, array_states);
3911 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3912 /* don't take reconfig_mutex when toggling between
3915 spin_lock(&mddev->lock);
3917 restart_array(mddev);
3918 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3919 md_wakeup_thread(mddev->thread);
3920 wake_up(&mddev->sb_wait);
3922 } else /* st == clean */ {
3923 restart_array(mddev);
3924 if (atomic_read(&mddev->writes_pending) == 0) {
3925 if (mddev->in_sync == 0) {
3927 if (mddev->safemode == 1)
3928 mddev->safemode = 0;
3929 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3936 sysfs_notify_dirent_safe(mddev->sysfs_state);
3937 spin_unlock(&mddev->lock);
3940 err = mddev_lock(mddev);
3948 /* stopping an active array */
3949 err = do_md_stop(mddev, 0, NULL);
3952 /* stopping an active array */
3954 err = do_md_stop(mddev, 2, NULL);
3956 err = 0; /* already inactive */
3959 break; /* not supported yet */
3962 err = md_set_readonly(mddev, NULL);
3965 set_disk_ro(mddev->gendisk, 1);
3966 err = do_md_run(mddev);
3972 err = md_set_readonly(mddev, NULL);
3973 else if (mddev->ro == 1)
3974 err = restart_array(mddev);
3977 set_disk_ro(mddev->gendisk, 0);
3981 err = do_md_run(mddev);
3986 err = restart_array(mddev);
3989 spin_lock(&mddev->lock);
3990 if (atomic_read(&mddev->writes_pending) == 0) {
3991 if (mddev->in_sync == 0) {
3993 if (mddev->safemode == 1)
3994 mddev->safemode = 0;
3995 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
4000 spin_unlock(&mddev->lock);
4006 err = restart_array(mddev);
4009 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4010 wake_up(&mddev->sb_wait);
4014 set_disk_ro(mddev->gendisk, 0);
4015 err = do_md_run(mddev);
4020 /* these cannot be set */
4025 if (mddev->hold_active == UNTIL_IOCTL)
4026 mddev->hold_active = 0;
4027 sysfs_notify_dirent_safe(mddev->sysfs_state);
4029 mddev_unlock(mddev);
4032 static struct md_sysfs_entry md_array_state =
4033 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4036 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4037 return sprintf(page, "%d\n",
4038 atomic_read(&mddev->max_corr_read_errors));
4042 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4047 rv = kstrtouint(buf, 10, &n);
4050 atomic_set(&mddev->max_corr_read_errors, n);
4054 static struct md_sysfs_entry max_corr_read_errors =
4055 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4056 max_corrected_read_errors_store);
4059 null_show(struct mddev *mddev, char *page)
4065 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4067 /* buf must be %d:%d\n? giving major and minor numbers */
4068 /* The new device is added to the array.
4069 * If the array has a persistent superblock, we read the
4070 * superblock to initialise info and check validity.
4071 * Otherwise, only checking done is that in bind_rdev_to_array,
4072 * which mainly checks size.
4075 int major = simple_strtoul(buf, &e, 10);
4078 struct md_rdev *rdev;
4081 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4083 minor = simple_strtoul(e+1, &e, 10);
4084 if (*e && *e != '\n')
4086 dev = MKDEV(major, minor);
4087 if (major != MAJOR(dev) ||
4088 minor != MINOR(dev))
4091 flush_workqueue(md_misc_wq);
4093 err = mddev_lock(mddev);
4096 if (mddev->persistent) {
4097 rdev = md_import_device(dev, mddev->major_version,
4098 mddev->minor_version);
4099 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4100 struct md_rdev *rdev0
4101 = list_entry(mddev->disks.next,
4102 struct md_rdev, same_set);
4103 err = super_types[mddev->major_version]
4104 .load_super(rdev, rdev0, mddev->minor_version);
4108 } else if (mddev->external)
4109 rdev = md_import_device(dev, -2, -1);
4111 rdev = md_import_device(dev, -1, -1);
4114 mddev_unlock(mddev);
4115 return PTR_ERR(rdev);
4117 err = bind_rdev_to_array(rdev, mddev);
4121 mddev_unlock(mddev);
4122 return err ? err : len;
4125 static struct md_sysfs_entry md_new_device =
4126 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4129 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4132 unsigned long chunk, end_chunk;
4135 err = mddev_lock(mddev);
4140 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4142 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4143 if (buf == end) break;
4144 if (*end == '-') { /* range */
4146 end_chunk = simple_strtoul(buf, &end, 0);
4147 if (buf == end) break;
4149 if (*end && !isspace(*end)) break;
4150 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4151 buf = skip_spaces(end);
4153 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4155 mddev_unlock(mddev);
4159 static struct md_sysfs_entry md_bitmap =
4160 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4163 size_show(struct mddev *mddev, char *page)
4165 return sprintf(page, "%llu\n",
4166 (unsigned long long)mddev->dev_sectors / 2);
4169 static int update_size(struct mddev *mddev, sector_t num_sectors);
4172 size_store(struct mddev *mddev, const char *buf, size_t len)
4174 /* If array is inactive, we can reduce the component size, but
4175 * not increase it (except from 0).
4176 * If array is active, we can try an on-line resize
4179 int err = strict_blocks_to_sectors(buf, §ors);
4183 err = mddev_lock(mddev);
4187 err = update_size(mddev, sectors);
4189 md_update_sb(mddev, 1);
4191 if (mddev->dev_sectors == 0 ||
4192 mddev->dev_sectors > sectors)
4193 mddev->dev_sectors = sectors;
4197 mddev_unlock(mddev);
4198 return err ? err : len;
4201 static struct md_sysfs_entry md_size =
4202 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4204 /* Metadata version.
4206 * 'none' for arrays with no metadata (good luck...)
4207 * 'external' for arrays with externally managed metadata,
4208 * or N.M for internally known formats
4211 metadata_show(struct mddev *mddev, char *page)
4213 if (mddev->persistent)
4214 return sprintf(page, "%d.%d\n",
4215 mddev->major_version, mddev->minor_version);
4216 else if (mddev->external)
4217 return sprintf(page, "external:%s\n", mddev->metadata_type);
4219 return sprintf(page, "none\n");
4223 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4228 /* Changing the details of 'external' metadata is
4229 * always permitted. Otherwise there must be
4230 * no devices attached to the array.
4233 err = mddev_lock(mddev);
4237 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4239 else if (!list_empty(&mddev->disks))
4243 if (cmd_match(buf, "none")) {
4244 mddev->persistent = 0;
4245 mddev->external = 0;
4246 mddev->major_version = 0;
4247 mddev->minor_version = 90;
4250 if (strncmp(buf, "external:", 9) == 0) {
4251 size_t namelen = len-9;
4252 if (namelen >= sizeof(mddev->metadata_type))
4253 namelen = sizeof(mddev->metadata_type)-1;
4254 strncpy(mddev->metadata_type, buf+9, namelen);
4255 mddev->metadata_type[namelen] = 0;
4256 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4257 mddev->metadata_type[--namelen] = 0;
4258 mddev->persistent = 0;
4259 mddev->external = 1;
4260 mddev->major_version = 0;
4261 mddev->minor_version = 90;
4264 major = simple_strtoul(buf, &e, 10);
4266 if (e==buf || *e != '.')
4269 minor = simple_strtoul(buf, &e, 10);
4270 if (e==buf || (*e && *e != '\n') )
4273 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4275 mddev->major_version = major;
4276 mddev->minor_version = minor;
4277 mddev->persistent = 1;
4278 mddev->external = 0;
4281 mddev_unlock(mddev);
4285 static struct md_sysfs_entry md_metadata =
4286 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4289 action_show(struct mddev *mddev, char *page)
4291 char *type = "idle";
4292 unsigned long recovery = mddev->recovery;
4293 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4295 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4296 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4297 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4299 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4300 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4302 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4306 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4308 else if (mddev->reshape_position != MaxSector)
4311 return sprintf(page, "%s\n", type);
4315 action_store(struct mddev *mddev, const char *page, size_t len)
4317 if (!mddev->pers || !mddev->pers->sync_request)
4321 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4322 if (cmd_match(page, "frozen"))
4323 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4325 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4326 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4327 mddev_lock(mddev) == 0) {
4328 flush_workqueue(md_misc_wq);
4329 if (mddev->sync_thread) {
4330 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4331 md_reap_sync_thread(mddev);
4333 mddev_unlock(mddev);
4335 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4337 else if (cmd_match(page, "resync"))
4338 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4339 else if (cmd_match(page, "recover")) {
4340 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4341 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4342 } else if (cmd_match(page, "reshape")) {
4344 if (mddev->pers->start_reshape == NULL)
4346 err = mddev_lock(mddev);
4348 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4351 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4352 err = mddev->pers->start_reshape(mddev);
4354 mddev_unlock(mddev);
4358 sysfs_notify(&mddev->kobj, NULL, "degraded");
4360 if (cmd_match(page, "check"))
4361 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4362 else if (!cmd_match(page, "repair"))
4364 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4365 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4366 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4368 if (mddev->ro == 2) {
4369 /* A write to sync_action is enough to justify
4370 * canceling read-auto mode
4373 md_wakeup_thread(mddev->sync_thread);
4375 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4376 md_wakeup_thread(mddev->thread);
4377 sysfs_notify_dirent_safe(mddev->sysfs_action);
4381 static struct md_sysfs_entry md_scan_mode =
4382 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4385 last_sync_action_show(struct mddev *mddev, char *page)
4387 return sprintf(page, "%s\n", mddev->last_sync_action);
4390 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4393 mismatch_cnt_show(struct mddev *mddev, char *page)
4395 return sprintf(page, "%llu\n",
4396 (unsigned long long)
4397 atomic64_read(&mddev->resync_mismatches));
4400 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4403 sync_min_show(struct mddev *mddev, char *page)
4405 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4406 mddev->sync_speed_min ? "local": "system");
4410 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4415 if (strncmp(buf, "system", 6)==0) {
4418 rv = kstrtouint(buf, 10, &min);
4424 mddev->sync_speed_min = min;
4428 static struct md_sysfs_entry md_sync_min =
4429 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4432 sync_max_show(struct mddev *mddev, char *page)
4434 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4435 mddev->sync_speed_max ? "local": "system");
4439 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4444 if (strncmp(buf, "system", 6)==0) {
4447 rv = kstrtouint(buf, 10, &max);
4453 mddev->sync_speed_max = max;
4457 static struct md_sysfs_entry md_sync_max =
4458 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4461 degraded_show(struct mddev *mddev, char *page)
4463 return sprintf(page, "%d\n", mddev->degraded);
4465 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4468 sync_force_parallel_show(struct mddev *mddev, char *page)
4470 return sprintf(page, "%d\n", mddev->parallel_resync);
4474 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4478 if (kstrtol(buf, 10, &n))
4481 if (n != 0 && n != 1)
4484 mddev->parallel_resync = n;
4486 if (mddev->sync_thread)
4487 wake_up(&resync_wait);
4492 /* force parallel resync, even with shared block devices */
4493 static struct md_sysfs_entry md_sync_force_parallel =
4494 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4495 sync_force_parallel_show, sync_force_parallel_store);
4498 sync_speed_show(struct mddev *mddev, char *page)
4500 unsigned long resync, dt, db;
4501 if (mddev->curr_resync == 0)
4502 return sprintf(page, "none\n");
4503 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4504 dt = (jiffies - mddev->resync_mark) / HZ;
4506 db = resync - mddev->resync_mark_cnt;
4507 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4510 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4513 sync_completed_show(struct mddev *mddev, char *page)
4515 unsigned long long max_sectors, resync;
4517 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4518 return sprintf(page, "none\n");
4520 if (mddev->curr_resync == 1 ||
4521 mddev->curr_resync == 2)
4522 return sprintf(page, "delayed\n");
4524 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4525 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4526 max_sectors = mddev->resync_max_sectors;
4528 max_sectors = mddev->dev_sectors;
4530 resync = mddev->curr_resync_completed;
4531 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4534 static struct md_sysfs_entry md_sync_completed =
4535 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4538 min_sync_show(struct mddev *mddev, char *page)
4540 return sprintf(page, "%llu\n",
4541 (unsigned long long)mddev->resync_min);
4544 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4546 unsigned long long min;
4549 if (kstrtoull(buf, 10, &min))
4552 spin_lock(&mddev->lock);
4554 if (min > mddev->resync_max)
4558 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4561 /* Round down to multiple of 4K for safety */
4562 mddev->resync_min = round_down(min, 8);
4566 spin_unlock(&mddev->lock);
4570 static struct md_sysfs_entry md_min_sync =
4571 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4574 max_sync_show(struct mddev *mddev, char *page)
4576 if (mddev->resync_max == MaxSector)
4577 return sprintf(page, "max\n");
4579 return sprintf(page, "%llu\n",
4580 (unsigned long long)mddev->resync_max);
4583 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4586 spin_lock(&mddev->lock);
4587 if (strncmp(buf, "max", 3) == 0)
4588 mddev->resync_max = MaxSector;
4590 unsigned long long max;
4594 if (kstrtoull(buf, 10, &max))
4596 if (max < mddev->resync_min)
4600 if (max < mddev->resync_max &&
4602 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4605 /* Must be a multiple of chunk_size */
4606 chunk = mddev->chunk_sectors;
4608 sector_t temp = max;
4611 if (sector_div(temp, chunk))
4614 mddev->resync_max = max;
4616 wake_up(&mddev->recovery_wait);
4619 spin_unlock(&mddev->lock);
4623 static struct md_sysfs_entry md_max_sync =
4624 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4627 suspend_lo_show(struct mddev *mddev, char *page)
4629 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4633 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4635 unsigned long long old, new;
4638 err = kstrtoull(buf, 10, &new);
4641 if (new != (sector_t)new)
4644 err = mddev_lock(mddev);
4648 if (mddev->pers == NULL ||
4649 mddev->pers->quiesce == NULL)
4651 old = mddev->suspend_lo;
4652 mddev->suspend_lo = new;
4654 /* Shrinking suspended region */
4655 mddev->pers->quiesce(mddev, 2);
4657 /* Expanding suspended region - need to wait */
4658 mddev->pers->quiesce(mddev, 1);
4659 mddev->pers->quiesce(mddev, 0);
4663 mddev_unlock(mddev);
4666 static struct md_sysfs_entry md_suspend_lo =
4667 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4670 suspend_hi_show(struct mddev *mddev, char *page)
4672 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4676 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4678 unsigned long long old, new;
4681 err = kstrtoull(buf, 10, &new);
4684 if (new != (sector_t)new)
4687 err = mddev_lock(mddev);
4691 if (mddev->pers == NULL ||
4692 mddev->pers->quiesce == NULL)
4694 old = mddev->suspend_hi;
4695 mddev->suspend_hi = new;
4697 /* Shrinking suspended region */
4698 mddev->pers->quiesce(mddev, 2);
4700 /* Expanding suspended region - need to wait */
4701 mddev->pers->quiesce(mddev, 1);
4702 mddev->pers->quiesce(mddev, 0);
4706 mddev_unlock(mddev);
4709 static struct md_sysfs_entry md_suspend_hi =
4710 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4713 reshape_position_show(struct mddev *mddev, char *page)
4715 if (mddev->reshape_position != MaxSector)
4716 return sprintf(page, "%llu\n",
4717 (unsigned long long)mddev->reshape_position);
4718 strcpy(page, "none\n");
4723 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4725 struct md_rdev *rdev;
4726 unsigned long long new;
4729 err = kstrtoull(buf, 10, &new);
4732 if (new != (sector_t)new)
4734 err = mddev_lock(mddev);
4740 mddev->reshape_position = new;
4741 mddev->delta_disks = 0;
4742 mddev->reshape_backwards = 0;
4743 mddev->new_level = mddev->level;
4744 mddev->new_layout = mddev->layout;
4745 mddev->new_chunk_sectors = mddev->chunk_sectors;
4746 rdev_for_each(rdev, mddev)
4747 rdev->new_data_offset = rdev->data_offset;
4750 mddev_unlock(mddev);
4754 static struct md_sysfs_entry md_reshape_position =
4755 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4756 reshape_position_store);
4759 reshape_direction_show(struct mddev *mddev, char *page)
4761 return sprintf(page, "%s\n",
4762 mddev->reshape_backwards ? "backwards" : "forwards");
4766 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4771 if (cmd_match(buf, "forwards"))
4773 else if (cmd_match(buf, "backwards"))
4777 if (mddev->reshape_backwards == backwards)
4780 err = mddev_lock(mddev);
4783 /* check if we are allowed to change */
4784 if (mddev->delta_disks)
4786 else if (mddev->persistent &&
4787 mddev->major_version == 0)
4790 mddev->reshape_backwards = backwards;
4791 mddev_unlock(mddev);
4795 static struct md_sysfs_entry md_reshape_direction =
4796 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4797 reshape_direction_store);
4800 array_size_show(struct mddev *mddev, char *page)
4802 if (mddev->external_size)
4803 return sprintf(page, "%llu\n",
4804 (unsigned long long)mddev->array_sectors/2);
4806 return sprintf(page, "default\n");
4810 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4815 err = mddev_lock(mddev);
4819 /* cluster raid doesn't support change array_sectors */
4820 if (mddev_is_clustered(mddev))
4823 if (strncmp(buf, "default", 7) == 0) {
4825 sectors = mddev->pers->size(mddev, 0, 0);
4827 sectors = mddev->array_sectors;
4829 mddev->external_size = 0;
4831 if (strict_blocks_to_sectors(buf, §ors) < 0)
4833 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4836 mddev->external_size = 1;
4840 mddev->array_sectors = sectors;
4842 set_capacity(mddev->gendisk, mddev->array_sectors);
4843 revalidate_disk(mddev->gendisk);
4846 mddev_unlock(mddev);
4850 static struct md_sysfs_entry md_array_size =
4851 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4854 static struct attribute *md_default_attrs[] = {
4857 &md_raid_disks.attr,
4858 &md_chunk_size.attr,
4860 &md_resync_start.attr,
4862 &md_new_device.attr,
4863 &md_safe_delay.attr,
4864 &md_array_state.attr,
4865 &md_reshape_position.attr,
4866 &md_reshape_direction.attr,
4867 &md_array_size.attr,
4868 &max_corr_read_errors.attr,
4872 static struct attribute *md_redundancy_attrs[] = {
4874 &md_last_scan_mode.attr,
4875 &md_mismatches.attr,
4878 &md_sync_speed.attr,
4879 &md_sync_force_parallel.attr,
4880 &md_sync_completed.attr,
4883 &md_suspend_lo.attr,
4884 &md_suspend_hi.attr,
4889 static struct attribute_group md_redundancy_group = {
4891 .attrs = md_redundancy_attrs,
4895 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4897 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4898 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4903 spin_lock(&all_mddevs_lock);
4904 if (list_empty(&mddev->all_mddevs)) {
4905 spin_unlock(&all_mddevs_lock);
4909 spin_unlock(&all_mddevs_lock);
4911 rv = entry->show(mddev, page);
4917 md_attr_store(struct kobject *kobj, struct attribute *attr,
4918 const char *page, size_t length)
4920 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4921 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4926 if (!capable(CAP_SYS_ADMIN))
4928 spin_lock(&all_mddevs_lock);
4929 if (list_empty(&mddev->all_mddevs)) {
4930 spin_unlock(&all_mddevs_lock);
4934 spin_unlock(&all_mddevs_lock);
4935 rv = entry->store(mddev, page, length);
4940 static void md_free(struct kobject *ko)
4942 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4944 if (mddev->sysfs_state)
4945 sysfs_put(mddev->sysfs_state);
4948 blk_cleanup_queue(mddev->queue);
4949 if (mddev->gendisk) {
4950 del_gendisk(mddev->gendisk);
4951 put_disk(mddev->gendisk);
4957 static const struct sysfs_ops md_sysfs_ops = {
4958 .show = md_attr_show,
4959 .store = md_attr_store,
4961 static struct kobj_type md_ktype = {
4963 .sysfs_ops = &md_sysfs_ops,
4964 .default_attrs = md_default_attrs,
4969 static void mddev_delayed_delete(struct work_struct *ws)
4971 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4973 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4974 kobject_del(&mddev->kobj);
4975 kobject_put(&mddev->kobj);
4978 static int md_alloc(dev_t dev, char *name)
4980 static DEFINE_MUTEX(disks_mutex);
4981 struct mddev *mddev = mddev_find(dev);
4982 struct gendisk *disk;
4991 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4992 shift = partitioned ? MdpMinorShift : 0;
4993 unit = MINOR(mddev->unit) >> shift;
4995 /* wait for any previous instance of this device to be
4996 * completely removed (mddev_delayed_delete).
4998 flush_workqueue(md_misc_wq);
5000 mutex_lock(&disks_mutex);
5006 /* Need to ensure that 'name' is not a duplicate.
5008 struct mddev *mddev2;
5009 spin_lock(&all_mddevs_lock);
5011 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5012 if (mddev2->gendisk &&
5013 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5014 spin_unlock(&all_mddevs_lock);
5017 spin_unlock(&all_mddevs_lock);
5021 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5024 mddev->queue->queuedata = mddev;
5026 blk_queue_make_request(mddev->queue, md_make_request);
5027 blk_set_stacking_limits(&mddev->queue->limits);
5029 disk = alloc_disk(1 << shift);
5031 blk_cleanup_queue(mddev->queue);
5032 mddev->queue = NULL;
5035 disk->major = MAJOR(mddev->unit);
5036 disk->first_minor = unit << shift;
5038 strcpy(disk->disk_name, name);
5039 else if (partitioned)
5040 sprintf(disk->disk_name, "md_d%d", unit);
5042 sprintf(disk->disk_name, "md%d", unit);
5043 disk->fops = &md_fops;
5044 disk->private_data = mddev;
5045 disk->queue = mddev->queue;
5046 blk_queue_write_cache(mddev->queue, true, true);
5047 /* Allow extended partitions. This makes the
5048 * 'mdp' device redundant, but we can't really
5051 disk->flags |= GENHD_FL_EXT_DEVT;
5052 mddev->gendisk = disk;
5053 /* As soon as we call add_disk(), another thread could get
5054 * through to md_open, so make sure it doesn't get too far
5056 mutex_lock(&mddev->open_mutex);
5059 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5060 &disk_to_dev(disk)->kobj, "%s", "md");
5062 /* This isn't possible, but as kobject_init_and_add is marked
5063 * __must_check, we must do something with the result
5065 pr_debug("md: cannot register %s/md - name in use\n",
5069 if (mddev->kobj.sd &&
5070 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5071 pr_debug("pointless warning\n");
5072 mutex_unlock(&mddev->open_mutex);
5074 mutex_unlock(&disks_mutex);
5075 if (!error && mddev->kobj.sd) {
5076 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5077 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5083 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5085 md_alloc(dev, NULL);
5089 static int add_named_array(const char *val, struct kernel_param *kp)
5091 /* val must be "md_*" where * is not all digits.
5092 * We allocate an array with a large free minor number, and
5093 * set the name to val. val must not already be an active name.
5095 int len = strlen(val);
5096 char buf[DISK_NAME_LEN];
5098 while (len && val[len-1] == '\n')
5100 if (len >= DISK_NAME_LEN)
5102 strlcpy(buf, val, len+1);
5103 if (strncmp(buf, "md_", 3) != 0)
5105 return md_alloc(0, buf);
5108 static void md_safemode_timeout(unsigned long data)
5110 struct mddev *mddev = (struct mddev *) data;
5112 if (!atomic_read(&mddev->writes_pending)) {
5113 mddev->safemode = 1;
5114 if (mddev->external)
5115 sysfs_notify_dirent_safe(mddev->sysfs_state);
5117 md_wakeup_thread(mddev->thread);
5120 static int start_dirty_degraded;
5122 int md_run(struct mddev *mddev)
5125 struct md_rdev *rdev;
5126 struct md_personality *pers;
5128 if (list_empty(&mddev->disks))
5129 /* cannot run an array with no devices.. */
5134 /* Cannot run until previous stop completes properly */
5135 if (mddev->sysfs_active)
5139 * Analyze all RAID superblock(s)
5141 if (!mddev->raid_disks) {
5142 if (!mddev->persistent)
5147 if (mddev->level != LEVEL_NONE)
5148 request_module("md-level-%d", mddev->level);
5149 else if (mddev->clevel[0])
5150 request_module("md-%s", mddev->clevel);
5153 * Drop all container device buffers, from now on
5154 * the only valid external interface is through the md
5157 rdev_for_each(rdev, mddev) {
5158 if (test_bit(Faulty, &rdev->flags))
5160 sync_blockdev(rdev->bdev);
5161 invalidate_bdev(rdev->bdev);
5163 /* perform some consistency tests on the device.
5164 * We don't want the data to overlap the metadata,
5165 * Internal Bitmap issues have been handled elsewhere.
5167 if (rdev->meta_bdev) {
5168 /* Nothing to check */;
5169 } else if (rdev->data_offset < rdev->sb_start) {
5170 if (mddev->dev_sectors &&
5171 rdev->data_offset + mddev->dev_sectors
5173 pr_warn("md: %s: data overlaps metadata\n",
5178 if (rdev->sb_start + rdev->sb_size/512
5179 > rdev->data_offset) {
5180 pr_warn("md: %s: metadata overlaps data\n",
5185 sysfs_notify_dirent_safe(rdev->sysfs_state);
5188 if (mddev->bio_set == NULL)
5189 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5191 spin_lock(&pers_lock);
5192 pers = find_pers(mddev->level, mddev->clevel);
5193 if (!pers || !try_module_get(pers->owner)) {
5194 spin_unlock(&pers_lock);
5195 if (mddev->level != LEVEL_NONE)
5196 pr_warn("md: personality for level %d is not loaded!\n",
5199 pr_warn("md: personality for level %s is not loaded!\n",
5203 spin_unlock(&pers_lock);
5204 if (mddev->level != pers->level) {
5205 mddev->level = pers->level;
5206 mddev->new_level = pers->level;
5208 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5210 if (mddev->reshape_position != MaxSector &&
5211 pers->start_reshape == NULL) {
5212 /* This personality cannot handle reshaping... */
5213 module_put(pers->owner);
5217 if (pers->sync_request) {
5218 /* Warn if this is a potentially silly
5221 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5222 struct md_rdev *rdev2;
5225 rdev_for_each(rdev, mddev)
5226 rdev_for_each(rdev2, mddev) {
5228 rdev->bdev->bd_contains ==
5229 rdev2->bdev->bd_contains) {
5230 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5232 bdevname(rdev->bdev,b),
5233 bdevname(rdev2->bdev,b2));
5239 pr_warn("True protection against single-disk failure might be compromised.\n");
5242 mddev->recovery = 0;
5243 /* may be over-ridden by personality */
5244 mddev->resync_max_sectors = mddev->dev_sectors;
5246 mddev->ok_start_degraded = start_dirty_degraded;
5248 if (start_readonly && mddev->ro == 0)
5249 mddev->ro = 2; /* read-only, but switch on first write */
5251 err = pers->run(mddev);
5253 pr_warn("md: pers->run() failed ...\n");
5254 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5255 WARN_ONCE(!mddev->external_size,
5256 "%s: default size too small, but 'external_size' not in effect?\n",
5258 pr_warn("md: invalid array_size %llu > default size %llu\n",
5259 (unsigned long long)mddev->array_sectors / 2,
5260 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5263 if (err == 0 && pers->sync_request &&
5264 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5265 struct bitmap *bitmap;
5267 bitmap = bitmap_create(mddev, -1);
5268 if (IS_ERR(bitmap)) {
5269 err = PTR_ERR(bitmap);
5270 pr_warn("%s: failed to create bitmap (%d)\n",
5271 mdname(mddev), err);
5273 mddev->bitmap = bitmap;
5277 mddev_detach(mddev);
5279 pers->free(mddev, mddev->private);
5280 mddev->private = NULL;
5281 module_put(pers->owner);
5282 bitmap_destroy(mddev);
5288 rdev_for_each(rdev, mddev) {
5289 if (rdev->raid_disk >= 0 &&
5290 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5295 if (mddev->degraded)
5298 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5300 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5301 mddev->queue->backing_dev_info.congested_data = mddev;
5302 mddev->queue->backing_dev_info.congested_fn = md_congested;
5304 if (pers->sync_request) {
5305 if (mddev->kobj.sd &&
5306 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5307 pr_warn("md: cannot register extra attributes for %s\n",
5309 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5310 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5313 atomic_set(&mddev->writes_pending,0);
5314 atomic_set(&mddev->max_corr_read_errors,
5315 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5316 mddev->safemode = 0;
5317 if (mddev_is_clustered(mddev))
5318 mddev->safemode_delay = 0;
5320 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5323 spin_lock(&mddev->lock);
5325 spin_unlock(&mddev->lock);
5326 rdev_for_each(rdev, mddev)
5327 if (rdev->raid_disk >= 0)
5328 if (sysfs_link_rdev(mddev, rdev))
5329 /* failure here is OK */;
5331 if (mddev->degraded && !mddev->ro)
5332 /* This ensures that recovering status is reported immediately
5333 * via sysfs - until a lack of spares is confirmed.
5335 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5336 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5338 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5339 md_update_sb(mddev, 0);
5341 md_new_event(mddev);
5342 sysfs_notify_dirent_safe(mddev->sysfs_state);
5343 sysfs_notify_dirent_safe(mddev->sysfs_action);
5344 sysfs_notify(&mddev->kobj, NULL, "degraded");
5347 EXPORT_SYMBOL_GPL(md_run);
5349 static int do_md_run(struct mddev *mddev)
5353 err = md_run(mddev);
5356 err = bitmap_load(mddev);
5358 bitmap_destroy(mddev);
5362 if (mddev_is_clustered(mddev))
5363 md_allow_write(mddev);
5365 md_wakeup_thread(mddev->thread);
5366 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5368 set_capacity(mddev->gendisk, mddev->array_sectors);
5369 revalidate_disk(mddev->gendisk);
5371 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5376 static int restart_array(struct mddev *mddev)
5378 struct gendisk *disk = mddev->gendisk;
5380 /* Complain if it has no devices */
5381 if (list_empty(&mddev->disks))
5387 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5388 struct md_rdev *rdev;
5389 bool has_journal = false;
5392 rdev_for_each_rcu(rdev, mddev) {
5393 if (test_bit(Journal, &rdev->flags) &&
5394 !test_bit(Faulty, &rdev->flags)) {
5401 /* Don't restart rw with journal missing/faulty */
5406 mddev->safemode = 0;
5408 set_disk_ro(disk, 0);
5409 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5410 /* Kick recovery or resync if necessary */
5411 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5412 md_wakeup_thread(mddev->thread);
5413 md_wakeup_thread(mddev->sync_thread);
5414 sysfs_notify_dirent_safe(mddev->sysfs_state);
5418 static void md_clean(struct mddev *mddev)
5420 mddev->array_sectors = 0;
5421 mddev->external_size = 0;
5422 mddev->dev_sectors = 0;
5423 mddev->raid_disks = 0;
5424 mddev->recovery_cp = 0;
5425 mddev->resync_min = 0;
5426 mddev->resync_max = MaxSector;
5427 mddev->reshape_position = MaxSector;
5428 mddev->external = 0;
5429 mddev->persistent = 0;
5430 mddev->level = LEVEL_NONE;
5431 mddev->clevel[0] = 0;
5434 mddev->metadata_type[0] = 0;
5435 mddev->chunk_sectors = 0;
5436 mddev->ctime = mddev->utime = 0;
5438 mddev->max_disks = 0;
5440 mddev->can_decrease_events = 0;
5441 mddev->delta_disks = 0;
5442 mddev->reshape_backwards = 0;
5443 mddev->new_level = LEVEL_NONE;
5444 mddev->new_layout = 0;
5445 mddev->new_chunk_sectors = 0;
5446 mddev->curr_resync = 0;
5447 atomic64_set(&mddev->resync_mismatches, 0);
5448 mddev->suspend_lo = mddev->suspend_hi = 0;
5449 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5450 mddev->recovery = 0;
5453 mddev->degraded = 0;
5454 mddev->safemode = 0;
5455 mddev->private = NULL;
5456 mddev->cluster_info = NULL;
5457 mddev->bitmap_info.offset = 0;
5458 mddev->bitmap_info.default_offset = 0;
5459 mddev->bitmap_info.default_space = 0;
5460 mddev->bitmap_info.chunksize = 0;
5461 mddev->bitmap_info.daemon_sleep = 0;
5462 mddev->bitmap_info.max_write_behind = 0;
5463 mddev->bitmap_info.nodes = 0;
5466 static void __md_stop_writes(struct mddev *mddev)
5468 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5469 flush_workqueue(md_misc_wq);
5470 if (mddev->sync_thread) {
5471 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5472 md_reap_sync_thread(mddev);
5475 del_timer_sync(&mddev->safemode_timer);
5477 bitmap_flush(mddev);
5479 if (mddev->ro == 0 &&
5480 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5481 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5482 /* mark array as shutdown cleanly */
5483 if (!mddev_is_clustered(mddev))
5485 md_update_sb(mddev, 1);
5489 void md_stop_writes(struct mddev *mddev)
5491 mddev_lock_nointr(mddev);
5492 __md_stop_writes(mddev);
5493 mddev_unlock(mddev);
5495 EXPORT_SYMBOL_GPL(md_stop_writes);
5497 static void mddev_detach(struct mddev *mddev)
5499 struct bitmap *bitmap = mddev->bitmap;
5500 /* wait for behind writes to complete */
5501 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5502 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
5504 /* need to kick something here to make sure I/O goes? */
5505 wait_event(bitmap->behind_wait,
5506 atomic_read(&bitmap->behind_writes) == 0);
5508 if (mddev->pers && mddev->pers->quiesce) {
5509 mddev->pers->quiesce(mddev, 1);
5510 mddev->pers->quiesce(mddev, 0);
5512 md_unregister_thread(&mddev->thread);
5514 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5517 static void __md_stop(struct mddev *mddev)
5519 struct md_personality *pers = mddev->pers;
5520 mddev_detach(mddev);
5521 /* Ensure ->event_work is done */
5522 flush_workqueue(md_misc_wq);
5523 spin_lock(&mddev->lock);
5525 spin_unlock(&mddev->lock);
5526 pers->free(mddev, mddev->private);
5527 mddev->private = NULL;
5528 if (pers->sync_request && mddev->to_remove == NULL)
5529 mddev->to_remove = &md_redundancy_group;
5530 module_put(pers->owner);
5531 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5534 void md_stop(struct mddev *mddev)
5536 /* stop the array and free an attached data structures.
5537 * This is called from dm-raid
5540 bitmap_destroy(mddev);
5542 bioset_free(mddev->bio_set);
5545 EXPORT_SYMBOL_GPL(md_stop);
5547 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5552 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5554 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5555 md_wakeup_thread(mddev->thread);
5557 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5558 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5559 if (mddev->sync_thread)
5560 /* Thread might be blocked waiting for metadata update
5561 * which will now never happen */
5562 wake_up_process(mddev->sync_thread->tsk);
5564 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5566 mddev_unlock(mddev);
5567 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5569 wait_event(mddev->sb_wait,
5570 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5571 mddev_lock_nointr(mddev);
5573 mutex_lock(&mddev->open_mutex);
5574 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5575 mddev->sync_thread ||
5576 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5577 pr_warn("md: %s still in use.\n",mdname(mddev));
5579 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5580 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5581 md_wakeup_thread(mddev->thread);
5587 __md_stop_writes(mddev);
5593 set_disk_ro(mddev->gendisk, 1);
5594 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5595 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5596 md_wakeup_thread(mddev->thread);
5597 sysfs_notify_dirent_safe(mddev->sysfs_state);
5601 mutex_unlock(&mddev->open_mutex);
5606 * 0 - completely stop and dis-assemble array
5607 * 2 - stop but do not disassemble array
5609 static int do_md_stop(struct mddev *mddev, int mode,
5610 struct block_device *bdev)
5612 struct gendisk *disk = mddev->gendisk;
5613 struct md_rdev *rdev;
5616 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5618 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5619 md_wakeup_thread(mddev->thread);
5621 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5622 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5623 if (mddev->sync_thread)
5624 /* Thread might be blocked waiting for metadata update
5625 * which will now never happen */
5626 wake_up_process(mddev->sync_thread->tsk);
5628 mddev_unlock(mddev);
5629 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5630 !test_bit(MD_RECOVERY_RUNNING,
5631 &mddev->recovery)));
5632 mddev_lock_nointr(mddev);
5634 mutex_lock(&mddev->open_mutex);
5635 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5636 mddev->sysfs_active ||
5637 mddev->sync_thread ||
5638 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5639 pr_warn("md: %s still in use.\n",mdname(mddev));
5640 mutex_unlock(&mddev->open_mutex);
5642 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5643 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5644 md_wakeup_thread(mddev->thread);
5650 set_disk_ro(disk, 0);
5652 __md_stop_writes(mddev);
5654 mddev->queue->backing_dev_info.congested_fn = NULL;
5656 /* tell userspace to handle 'inactive' */
5657 sysfs_notify_dirent_safe(mddev->sysfs_state);
5659 rdev_for_each(rdev, mddev)
5660 if (rdev->raid_disk >= 0)
5661 sysfs_unlink_rdev(mddev, rdev);
5663 set_capacity(disk, 0);
5664 mutex_unlock(&mddev->open_mutex);
5666 revalidate_disk(disk);
5671 mutex_unlock(&mddev->open_mutex);
5673 * Free resources if final stop
5676 pr_info("md: %s stopped.\n", mdname(mddev));
5678 bitmap_destroy(mddev);
5679 if (mddev->bitmap_info.file) {
5680 struct file *f = mddev->bitmap_info.file;
5681 spin_lock(&mddev->lock);
5682 mddev->bitmap_info.file = NULL;
5683 spin_unlock(&mddev->lock);
5686 mddev->bitmap_info.offset = 0;
5688 export_array(mddev);
5691 if (mddev->hold_active == UNTIL_STOP)
5692 mddev->hold_active = 0;
5694 md_new_event(mddev);
5695 sysfs_notify_dirent_safe(mddev->sysfs_state);
5700 static void autorun_array(struct mddev *mddev)
5702 struct md_rdev *rdev;
5705 if (list_empty(&mddev->disks))
5708 pr_info("md: running: ");
5710 rdev_for_each(rdev, mddev) {
5711 char b[BDEVNAME_SIZE];
5712 pr_cont("<%s>", bdevname(rdev->bdev,b));
5716 err = do_md_run(mddev);
5718 pr_warn("md: do_md_run() returned %d\n", err);
5719 do_md_stop(mddev, 0, NULL);
5724 * lets try to run arrays based on all disks that have arrived
5725 * until now. (those are in pending_raid_disks)
5727 * the method: pick the first pending disk, collect all disks with
5728 * the same UUID, remove all from the pending list and put them into
5729 * the 'same_array' list. Then order this list based on superblock
5730 * update time (freshest comes first), kick out 'old' disks and
5731 * compare superblocks. If everything's fine then run it.
5733 * If "unit" is allocated, then bump its reference count
5735 static void autorun_devices(int part)
5737 struct md_rdev *rdev0, *rdev, *tmp;
5738 struct mddev *mddev;
5739 char b[BDEVNAME_SIZE];
5741 pr_info("md: autorun ...\n");
5742 while (!list_empty(&pending_raid_disks)) {
5745 LIST_HEAD(candidates);
5746 rdev0 = list_entry(pending_raid_disks.next,
5747 struct md_rdev, same_set);
5749 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
5750 INIT_LIST_HEAD(&candidates);
5751 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5752 if (super_90_load(rdev, rdev0, 0) >= 0) {
5753 pr_debug("md: adding %s ...\n",
5754 bdevname(rdev->bdev,b));
5755 list_move(&rdev->same_set, &candidates);
5758 * now we have a set of devices, with all of them having
5759 * mostly sane superblocks. It's time to allocate the
5763 dev = MKDEV(mdp_major,
5764 rdev0->preferred_minor << MdpMinorShift);
5765 unit = MINOR(dev) >> MdpMinorShift;
5767 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5770 if (rdev0->preferred_minor != unit) {
5771 pr_warn("md: unit number in %s is bad: %d\n",
5772 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5776 md_probe(dev, NULL, NULL);
5777 mddev = mddev_find(dev);
5778 if (!mddev || !mddev->gendisk) {
5783 if (mddev_lock(mddev))
5784 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
5785 else if (mddev->raid_disks || mddev->major_version
5786 || !list_empty(&mddev->disks)) {
5787 pr_warn("md: %s already running, cannot run %s\n",
5788 mdname(mddev), bdevname(rdev0->bdev,b));
5789 mddev_unlock(mddev);
5791 pr_debug("md: created %s\n", mdname(mddev));
5792 mddev->persistent = 1;
5793 rdev_for_each_list(rdev, tmp, &candidates) {
5794 list_del_init(&rdev->same_set);
5795 if (bind_rdev_to_array(rdev, mddev))
5798 autorun_array(mddev);
5799 mddev_unlock(mddev);
5801 /* on success, candidates will be empty, on error
5804 rdev_for_each_list(rdev, tmp, &candidates) {
5805 list_del_init(&rdev->same_set);
5810 pr_info("md: ... autorun DONE.\n");
5812 #endif /* !MODULE */
5814 static int get_version(void __user *arg)
5818 ver.major = MD_MAJOR_VERSION;
5819 ver.minor = MD_MINOR_VERSION;
5820 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5822 if (copy_to_user(arg, &ver, sizeof(ver)))
5828 static int get_array_info(struct mddev *mddev, void __user *arg)
5830 mdu_array_info_t info;
5831 int nr,working,insync,failed,spare;
5832 struct md_rdev *rdev;
5834 nr = working = insync = failed = spare = 0;
5836 rdev_for_each_rcu(rdev, mddev) {
5838 if (test_bit(Faulty, &rdev->flags))
5842 if (test_bit(In_sync, &rdev->flags))
5844 else if (test_bit(Journal, &rdev->flags))
5845 /* TODO: add journal count to md_u.h */
5853 info.major_version = mddev->major_version;
5854 info.minor_version = mddev->minor_version;
5855 info.patch_version = MD_PATCHLEVEL_VERSION;
5856 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
5857 info.level = mddev->level;
5858 info.size = mddev->dev_sectors / 2;
5859 if (info.size != mddev->dev_sectors / 2) /* overflow */
5862 info.raid_disks = mddev->raid_disks;
5863 info.md_minor = mddev->md_minor;
5864 info.not_persistent= !mddev->persistent;
5866 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
5869 info.state = (1<<MD_SB_CLEAN);
5870 if (mddev->bitmap && mddev->bitmap_info.offset)
5871 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5872 if (mddev_is_clustered(mddev))
5873 info.state |= (1<<MD_SB_CLUSTERED);
5874 info.active_disks = insync;
5875 info.working_disks = working;
5876 info.failed_disks = failed;
5877 info.spare_disks = spare;
5879 info.layout = mddev->layout;
5880 info.chunk_size = mddev->chunk_sectors << 9;
5882 if (copy_to_user(arg, &info, sizeof(info)))
5888 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5890 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5894 file = kzalloc(sizeof(*file), GFP_NOIO);
5899 spin_lock(&mddev->lock);
5900 /* bitmap enabled */
5901 if (mddev->bitmap_info.file) {
5902 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5903 sizeof(file->pathname));
5907 memmove(file->pathname, ptr,
5908 sizeof(file->pathname)-(ptr-file->pathname));
5910 spin_unlock(&mddev->lock);
5913 copy_to_user(arg, file, sizeof(*file)))
5920 static int get_disk_info(struct mddev *mddev, void __user * arg)
5922 mdu_disk_info_t info;
5923 struct md_rdev *rdev;
5925 if (copy_from_user(&info, arg, sizeof(info)))
5929 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5931 info.major = MAJOR(rdev->bdev->bd_dev);
5932 info.minor = MINOR(rdev->bdev->bd_dev);
5933 info.raid_disk = rdev->raid_disk;
5935 if (test_bit(Faulty, &rdev->flags))
5936 info.state |= (1<<MD_DISK_FAULTY);
5937 else if (test_bit(In_sync, &rdev->flags)) {
5938 info.state |= (1<<MD_DISK_ACTIVE);
5939 info.state |= (1<<MD_DISK_SYNC);
5941 if (test_bit(Journal, &rdev->flags))
5942 info.state |= (1<<MD_DISK_JOURNAL);
5943 if (test_bit(WriteMostly, &rdev->flags))
5944 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5946 info.major = info.minor = 0;
5947 info.raid_disk = -1;
5948 info.state = (1<<MD_DISK_REMOVED);
5952 if (copy_to_user(arg, &info, sizeof(info)))
5958 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5960 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5961 struct md_rdev *rdev;
5962 dev_t dev = MKDEV(info->major,info->minor);
5964 if (mddev_is_clustered(mddev) &&
5965 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5966 pr_warn("%s: Cannot add to clustered mddev.\n",
5971 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5974 if (!mddev->raid_disks) {
5976 /* expecting a device which has a superblock */
5977 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5979 pr_warn("md: md_import_device returned %ld\n",
5981 return PTR_ERR(rdev);
5983 if (!list_empty(&mddev->disks)) {
5984 struct md_rdev *rdev0
5985 = list_entry(mddev->disks.next,
5986 struct md_rdev, same_set);
5987 err = super_types[mddev->major_version]
5988 .load_super(rdev, rdev0, mddev->minor_version);
5990 pr_warn("md: %s has different UUID to %s\n",
5991 bdevname(rdev->bdev,b),
5992 bdevname(rdev0->bdev,b2));
5997 err = bind_rdev_to_array(rdev, mddev);
6004 * add_new_disk can be used once the array is assembled
6005 * to add "hot spares". They must already have a superblock
6010 if (!mddev->pers->hot_add_disk) {
6011 pr_warn("%s: personality does not support diskops!\n",
6015 if (mddev->persistent)
6016 rdev = md_import_device(dev, mddev->major_version,
6017 mddev->minor_version);
6019 rdev = md_import_device(dev, -1, -1);
6021 pr_warn("md: md_import_device returned %ld\n",
6023 return PTR_ERR(rdev);
6025 /* set saved_raid_disk if appropriate */
6026 if (!mddev->persistent) {
6027 if (info->state & (1<<MD_DISK_SYNC) &&
6028 info->raid_disk < mddev->raid_disks) {
6029 rdev->raid_disk = info->raid_disk;
6030 set_bit(In_sync, &rdev->flags);
6031 clear_bit(Bitmap_sync, &rdev->flags);
6033 rdev->raid_disk = -1;
6034 rdev->saved_raid_disk = rdev->raid_disk;
6036 super_types[mddev->major_version].
6037 validate_super(mddev, rdev);
6038 if ((info->state & (1<<MD_DISK_SYNC)) &&
6039 rdev->raid_disk != info->raid_disk) {
6040 /* This was a hot-add request, but events doesn't
6041 * match, so reject it.
6047 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6048 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6049 set_bit(WriteMostly, &rdev->flags);
6051 clear_bit(WriteMostly, &rdev->flags);
6053 if (info->state & (1<<MD_DISK_JOURNAL)) {
6054 struct md_rdev *rdev2;
6055 bool has_journal = false;
6057 /* make sure no existing journal disk */
6058 rdev_for_each(rdev2, mddev) {
6059 if (test_bit(Journal, &rdev2->flags)) {
6068 set_bit(Journal, &rdev->flags);
6071 * check whether the device shows up in other nodes
6073 if (mddev_is_clustered(mddev)) {
6074 if (info->state & (1 << MD_DISK_CANDIDATE))
6075 set_bit(Candidate, &rdev->flags);
6076 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6077 /* --add initiated by this node */
6078 err = md_cluster_ops->add_new_disk(mddev, rdev);
6086 rdev->raid_disk = -1;
6087 err = bind_rdev_to_array(rdev, mddev);
6092 if (mddev_is_clustered(mddev)) {
6093 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6095 err = md_cluster_ops->new_disk_ack(mddev,
6098 md_kick_rdev_from_array(rdev);
6102 md_cluster_ops->add_new_disk_cancel(mddev);
6104 err = add_bound_rdev(rdev);
6108 err = add_bound_rdev(rdev);
6113 /* otherwise, add_new_disk is only allowed
6114 * for major_version==0 superblocks
6116 if (mddev->major_version != 0) {
6117 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6121 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6123 rdev = md_import_device(dev, -1, 0);
6125 pr_warn("md: error, md_import_device() returned %ld\n",
6127 return PTR_ERR(rdev);
6129 rdev->desc_nr = info->number;
6130 if (info->raid_disk < mddev->raid_disks)
6131 rdev->raid_disk = info->raid_disk;
6133 rdev->raid_disk = -1;
6135 if (rdev->raid_disk < mddev->raid_disks)
6136 if (info->state & (1<<MD_DISK_SYNC))
6137 set_bit(In_sync, &rdev->flags);
6139 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6140 set_bit(WriteMostly, &rdev->flags);
6142 if (!mddev->persistent) {
6143 pr_debug("md: nonpersistent superblock ...\n");
6144 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6146 rdev->sb_start = calc_dev_sboffset(rdev);
6147 rdev->sectors = rdev->sb_start;
6149 err = bind_rdev_to_array(rdev, mddev);
6159 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6161 char b[BDEVNAME_SIZE];
6162 struct md_rdev *rdev;
6164 rdev = find_rdev(mddev, dev);
6168 if (rdev->raid_disk < 0)
6171 clear_bit(Blocked, &rdev->flags);
6172 remove_and_add_spares(mddev, rdev);
6174 if (rdev->raid_disk >= 0)
6178 if (mddev_is_clustered(mddev))
6179 md_cluster_ops->remove_disk(mddev, rdev);
6181 md_kick_rdev_from_array(rdev);
6182 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6184 md_wakeup_thread(mddev->thread);
6186 md_update_sb(mddev, 1);
6187 md_new_event(mddev);
6191 pr_debug("md: cannot remove active disk %s from %s ...\n",
6192 bdevname(rdev->bdev,b), mdname(mddev));
6196 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6198 char b[BDEVNAME_SIZE];
6200 struct md_rdev *rdev;
6205 if (mddev->major_version != 0) {
6206 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6210 if (!mddev->pers->hot_add_disk) {
6211 pr_warn("%s: personality does not support diskops!\n",
6216 rdev = md_import_device(dev, -1, 0);
6218 pr_warn("md: error, md_import_device() returned %ld\n",
6223 if (mddev->persistent)
6224 rdev->sb_start = calc_dev_sboffset(rdev);
6226 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6228 rdev->sectors = rdev->sb_start;
6230 if (test_bit(Faulty, &rdev->flags)) {
6231 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6232 bdevname(rdev->bdev,b), mdname(mddev));
6237 clear_bit(In_sync, &rdev->flags);
6239 rdev->saved_raid_disk = -1;
6240 err = bind_rdev_to_array(rdev, mddev);
6245 * The rest should better be atomic, we can have disk failures
6246 * noticed in interrupt contexts ...
6249 rdev->raid_disk = -1;
6251 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6253 md_update_sb(mddev, 1);
6255 * Kick recovery, maybe this spare has to be added to the
6256 * array immediately.
6258 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6259 md_wakeup_thread(mddev->thread);
6260 md_new_event(mddev);
6268 static int set_bitmap_file(struct mddev *mddev, int fd)
6273 if (!mddev->pers->quiesce || !mddev->thread)
6275 if (mddev->recovery || mddev->sync_thread)
6277 /* we should be able to change the bitmap.. */
6281 struct inode *inode;
6284 if (mddev->bitmap || mddev->bitmap_info.file)
6285 return -EEXIST; /* cannot add when bitmap is present */
6289 pr_warn("%s: error: failed to get bitmap file\n",
6294 inode = f->f_mapping->host;
6295 if (!S_ISREG(inode->i_mode)) {
6296 pr_warn("%s: error: bitmap file must be a regular file\n",
6299 } else if (!(f->f_mode & FMODE_WRITE)) {
6300 pr_warn("%s: error: bitmap file must open for write\n",
6303 } else if (atomic_read(&inode->i_writecount) != 1) {
6304 pr_warn("%s: error: bitmap file is already in use\n",
6312 mddev->bitmap_info.file = f;
6313 mddev->bitmap_info.offset = 0; /* file overrides offset */
6314 } else if (mddev->bitmap == NULL)
6315 return -ENOENT; /* cannot remove what isn't there */
6318 mddev->pers->quiesce(mddev, 1);
6320 struct bitmap *bitmap;
6322 bitmap = bitmap_create(mddev, -1);
6323 if (!IS_ERR(bitmap)) {
6324 mddev->bitmap = bitmap;
6325 err = bitmap_load(mddev);
6327 err = PTR_ERR(bitmap);
6329 if (fd < 0 || err) {
6330 bitmap_destroy(mddev);
6331 fd = -1; /* make sure to put the file */
6333 mddev->pers->quiesce(mddev, 0);
6336 struct file *f = mddev->bitmap_info.file;
6338 spin_lock(&mddev->lock);
6339 mddev->bitmap_info.file = NULL;
6340 spin_unlock(&mddev->lock);
6349 * set_array_info is used two different ways
6350 * The original usage is when creating a new array.
6351 * In this usage, raid_disks is > 0 and it together with
6352 * level, size, not_persistent,layout,chunksize determine the
6353 * shape of the array.
6354 * This will always create an array with a type-0.90.0 superblock.
6355 * The newer usage is when assembling an array.
6356 * In this case raid_disks will be 0, and the major_version field is
6357 * use to determine which style super-blocks are to be found on the devices.
6358 * The minor and patch _version numbers are also kept incase the
6359 * super_block handler wishes to interpret them.
6361 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6364 if (info->raid_disks == 0) {
6365 /* just setting version number for superblock loading */
6366 if (info->major_version < 0 ||
6367 info->major_version >= ARRAY_SIZE(super_types) ||
6368 super_types[info->major_version].name == NULL) {
6369 /* maybe try to auto-load a module? */
6370 pr_warn("md: superblock version %d not known\n",
6371 info->major_version);
6374 mddev->major_version = info->major_version;
6375 mddev->minor_version = info->minor_version;
6376 mddev->patch_version = info->patch_version;
6377 mddev->persistent = !info->not_persistent;
6378 /* ensure mddev_put doesn't delete this now that there
6379 * is some minimal configuration.
6381 mddev->ctime = ktime_get_real_seconds();
6384 mddev->major_version = MD_MAJOR_VERSION;
6385 mddev->minor_version = MD_MINOR_VERSION;
6386 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6387 mddev->ctime = ktime_get_real_seconds();
6389 mddev->level = info->level;
6390 mddev->clevel[0] = 0;
6391 mddev->dev_sectors = 2 * (sector_t)info->size;
6392 mddev->raid_disks = info->raid_disks;
6393 /* don't set md_minor, it is determined by which /dev/md* was
6396 if (info->state & (1<<MD_SB_CLEAN))
6397 mddev->recovery_cp = MaxSector;
6399 mddev->recovery_cp = 0;
6400 mddev->persistent = ! info->not_persistent;
6401 mddev->external = 0;
6403 mddev->layout = info->layout;
6404 mddev->chunk_sectors = info->chunk_size >> 9;
6406 mddev->max_disks = MD_SB_DISKS;
6408 if (mddev->persistent)
6410 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6412 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6413 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6414 mddev->bitmap_info.offset = 0;
6416 mddev->reshape_position = MaxSector;
6419 * Generate a 128 bit UUID
6421 get_random_bytes(mddev->uuid, 16);
6423 mddev->new_level = mddev->level;
6424 mddev->new_chunk_sectors = mddev->chunk_sectors;
6425 mddev->new_layout = mddev->layout;
6426 mddev->delta_disks = 0;
6427 mddev->reshape_backwards = 0;
6432 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6434 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6436 if (mddev->external_size)
6439 mddev->array_sectors = array_sectors;
6441 EXPORT_SYMBOL(md_set_array_sectors);
6443 static int update_size(struct mddev *mddev, sector_t num_sectors)
6445 struct md_rdev *rdev;
6447 int fit = (num_sectors == 0);
6449 /* cluster raid doesn't support update size */
6450 if (mddev_is_clustered(mddev))
6453 if (mddev->pers->resize == NULL)
6455 /* The "num_sectors" is the number of sectors of each device that
6456 * is used. This can only make sense for arrays with redundancy.
6457 * linear and raid0 always use whatever space is available. We can only
6458 * consider changing this number if no resync or reconstruction is
6459 * happening, and if the new size is acceptable. It must fit before the
6460 * sb_start or, if that is <data_offset, it must fit before the size
6461 * of each device. If num_sectors is zero, we find the largest size
6464 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6470 rdev_for_each(rdev, mddev) {
6471 sector_t avail = rdev->sectors;
6473 if (fit && (num_sectors == 0 || num_sectors > avail))
6474 num_sectors = avail;
6475 if (avail < num_sectors)
6478 rv = mddev->pers->resize(mddev, num_sectors);
6480 revalidate_disk(mddev->gendisk);
6484 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6487 struct md_rdev *rdev;
6488 /* change the number of raid disks */
6489 if (mddev->pers->check_reshape == NULL)
6493 if (raid_disks <= 0 ||
6494 (mddev->max_disks && raid_disks >= mddev->max_disks))
6496 if (mddev->sync_thread ||
6497 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6498 mddev->reshape_position != MaxSector)
6501 rdev_for_each(rdev, mddev) {
6502 if (mddev->raid_disks < raid_disks &&
6503 rdev->data_offset < rdev->new_data_offset)
6505 if (mddev->raid_disks > raid_disks &&
6506 rdev->data_offset > rdev->new_data_offset)
6510 mddev->delta_disks = raid_disks - mddev->raid_disks;
6511 if (mddev->delta_disks < 0)
6512 mddev->reshape_backwards = 1;
6513 else if (mddev->delta_disks > 0)
6514 mddev->reshape_backwards = 0;
6516 rv = mddev->pers->check_reshape(mddev);
6518 mddev->delta_disks = 0;
6519 mddev->reshape_backwards = 0;
6525 * update_array_info is used to change the configuration of an
6527 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6528 * fields in the info are checked against the array.
6529 * Any differences that cannot be handled will cause an error.
6530 * Normally, only one change can be managed at a time.
6532 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6538 /* calculate expected state,ignoring low bits */
6539 if (mddev->bitmap && mddev->bitmap_info.offset)
6540 state |= (1 << MD_SB_BITMAP_PRESENT);
6542 if (mddev->major_version != info->major_version ||
6543 mddev->minor_version != info->minor_version ||
6544 /* mddev->patch_version != info->patch_version || */
6545 mddev->ctime != info->ctime ||
6546 mddev->level != info->level ||
6547 /* mddev->layout != info->layout || */
6548 mddev->persistent != !info->not_persistent ||
6549 mddev->chunk_sectors != info->chunk_size >> 9 ||
6550 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6551 ((state^info->state) & 0xfffffe00)
6554 /* Check there is only one change */
6555 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6557 if (mddev->raid_disks != info->raid_disks)
6559 if (mddev->layout != info->layout)
6561 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6568 if (mddev->layout != info->layout) {
6570 * we don't need to do anything at the md level, the
6571 * personality will take care of it all.
6573 if (mddev->pers->check_reshape == NULL)
6576 mddev->new_layout = info->layout;
6577 rv = mddev->pers->check_reshape(mddev);
6579 mddev->new_layout = mddev->layout;
6583 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6584 rv = update_size(mddev, (sector_t)info->size * 2);
6586 if (mddev->raid_disks != info->raid_disks)
6587 rv = update_raid_disks(mddev, info->raid_disks);
6589 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6590 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6594 if (mddev->recovery || mddev->sync_thread) {
6598 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6599 struct bitmap *bitmap;
6600 /* add the bitmap */
6601 if (mddev->bitmap) {
6605 if (mddev->bitmap_info.default_offset == 0) {
6609 mddev->bitmap_info.offset =
6610 mddev->bitmap_info.default_offset;
6611 mddev->bitmap_info.space =
6612 mddev->bitmap_info.default_space;
6613 mddev->pers->quiesce(mddev, 1);
6614 bitmap = bitmap_create(mddev, -1);
6615 if (!IS_ERR(bitmap)) {
6616 mddev->bitmap = bitmap;
6617 rv = bitmap_load(mddev);
6619 rv = PTR_ERR(bitmap);
6621 bitmap_destroy(mddev);
6622 mddev->pers->quiesce(mddev, 0);
6624 /* remove the bitmap */
6625 if (!mddev->bitmap) {
6629 if (mddev->bitmap->storage.file) {
6633 if (mddev->bitmap_info.nodes) {
6634 /* hold PW on all the bitmap lock */
6635 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6636 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6638 md_cluster_ops->unlock_all_bitmaps(mddev);
6642 mddev->bitmap_info.nodes = 0;
6643 md_cluster_ops->leave(mddev);
6645 mddev->pers->quiesce(mddev, 1);
6646 bitmap_destroy(mddev);
6647 mddev->pers->quiesce(mddev, 0);
6648 mddev->bitmap_info.offset = 0;
6651 md_update_sb(mddev, 1);
6657 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6659 struct md_rdev *rdev;
6662 if (mddev->pers == NULL)
6666 rdev = find_rdev_rcu(mddev, dev);
6670 md_error(mddev, rdev);
6671 if (!test_bit(Faulty, &rdev->flags))
6679 * We have a problem here : there is no easy way to give a CHS
6680 * virtual geometry. We currently pretend that we have a 2 heads
6681 * 4 sectors (with a BIG number of cylinders...). This drives
6682 * dosfs just mad... ;-)
6684 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6686 struct mddev *mddev = bdev->bd_disk->private_data;
6690 geo->cylinders = mddev->array_sectors / 8;
6694 static inline bool md_ioctl_valid(unsigned int cmd)
6699 case GET_ARRAY_INFO:
6700 case GET_BITMAP_FILE:
6703 case HOT_REMOVE_DISK:
6706 case RESTART_ARRAY_RW:
6708 case SET_ARRAY_INFO:
6709 case SET_BITMAP_FILE:
6710 case SET_DISK_FAULTY:
6713 case CLUSTERED_DISK_NACK:
6720 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6721 unsigned int cmd, unsigned long arg)
6724 void __user *argp = (void __user *)arg;
6725 struct mddev *mddev = NULL;
6728 if (!md_ioctl_valid(cmd))
6733 case GET_ARRAY_INFO:
6737 if (!capable(CAP_SYS_ADMIN))
6742 * Commands dealing with the RAID driver but not any
6747 err = get_version(argp);
6753 autostart_arrays(arg);
6760 * Commands creating/starting a new array:
6763 mddev = bdev->bd_disk->private_data;
6770 /* Some actions do not requires the mutex */
6772 case GET_ARRAY_INFO:
6773 if (!mddev->raid_disks && !mddev->external)
6776 err = get_array_info(mddev, argp);
6780 if (!mddev->raid_disks && !mddev->external)
6783 err = get_disk_info(mddev, argp);
6786 case SET_DISK_FAULTY:
6787 err = set_disk_faulty(mddev, new_decode_dev(arg));
6790 case GET_BITMAP_FILE:
6791 err = get_bitmap_file(mddev, argp);
6796 if (cmd == ADD_NEW_DISK)
6797 /* need to ensure md_delayed_delete() has completed */
6798 flush_workqueue(md_misc_wq);
6800 if (cmd == HOT_REMOVE_DISK)
6801 /* need to ensure recovery thread has run */
6802 wait_event_interruptible_timeout(mddev->sb_wait,
6803 !test_bit(MD_RECOVERY_NEEDED,
6805 msecs_to_jiffies(5000));
6806 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6807 /* Need to flush page cache, and ensure no-one else opens
6810 mutex_lock(&mddev->open_mutex);
6811 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6812 mutex_unlock(&mddev->open_mutex);
6816 set_bit(MD_CLOSING, &mddev->flags);
6817 mutex_unlock(&mddev->open_mutex);
6818 sync_blockdev(bdev);
6820 err = mddev_lock(mddev);
6822 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
6827 if (cmd == SET_ARRAY_INFO) {
6828 mdu_array_info_t info;
6830 memset(&info, 0, sizeof(info));
6831 else if (copy_from_user(&info, argp, sizeof(info))) {
6836 err = update_array_info(mddev, &info);
6838 pr_warn("md: couldn't update array info. %d\n", err);
6843 if (!list_empty(&mddev->disks)) {
6844 pr_warn("md: array %s already has disks!\n", mdname(mddev));
6848 if (mddev->raid_disks) {
6849 pr_warn("md: array %s already initialised!\n", mdname(mddev));
6853 err = set_array_info(mddev, &info);
6855 pr_warn("md: couldn't set array info. %d\n", err);
6862 * Commands querying/configuring an existing array:
6864 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6865 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6866 if ((!mddev->raid_disks && !mddev->external)
6867 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6868 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6869 && cmd != GET_BITMAP_FILE) {
6875 * Commands even a read-only array can execute:
6878 case RESTART_ARRAY_RW:
6879 err = restart_array(mddev);
6883 err = do_md_stop(mddev, 0, bdev);
6887 err = md_set_readonly(mddev, bdev);
6890 case HOT_REMOVE_DISK:
6891 err = hot_remove_disk(mddev, new_decode_dev(arg));
6895 /* We can support ADD_NEW_DISK on read-only arrays
6896 * only if we are re-adding a preexisting device.
6897 * So require mddev->pers and MD_DISK_SYNC.
6900 mdu_disk_info_t info;
6901 if (copy_from_user(&info, argp, sizeof(info)))
6903 else if (!(info.state & (1<<MD_DISK_SYNC)))
6904 /* Need to clear read-only for this */
6907 err = add_new_disk(mddev, &info);
6913 if (get_user(ro, (int __user *)(arg))) {
6919 /* if the bdev is going readonly the value of mddev->ro
6920 * does not matter, no writes are coming
6925 /* are we are already prepared for writes? */
6929 /* transitioning to readauto need only happen for
6930 * arrays that call md_write_start
6933 err = restart_array(mddev);
6936 set_disk_ro(mddev->gendisk, 0);
6943 * The remaining ioctls are changing the state of the
6944 * superblock, so we do not allow them on read-only arrays.
6946 if (mddev->ro && mddev->pers) {
6947 if (mddev->ro == 2) {
6949 sysfs_notify_dirent_safe(mddev->sysfs_state);
6950 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6951 /* mddev_unlock will wake thread */
6952 /* If a device failed while we were read-only, we
6953 * need to make sure the metadata is updated now.
6955 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6956 mddev_unlock(mddev);
6957 wait_event(mddev->sb_wait,
6958 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6959 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6960 mddev_lock_nointr(mddev);
6971 mdu_disk_info_t info;
6972 if (copy_from_user(&info, argp, sizeof(info)))
6975 err = add_new_disk(mddev, &info);
6979 case CLUSTERED_DISK_NACK:
6980 if (mddev_is_clustered(mddev))
6981 md_cluster_ops->new_disk_ack(mddev, false);
6987 err = hot_add_disk(mddev, new_decode_dev(arg));
6991 err = do_md_run(mddev);
6994 case SET_BITMAP_FILE:
6995 err = set_bitmap_file(mddev, (int)arg);
7004 if (mddev->hold_active == UNTIL_IOCTL &&
7006 mddev->hold_active = 0;
7007 mddev_unlock(mddev);
7011 #ifdef CONFIG_COMPAT
7012 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7013 unsigned int cmd, unsigned long arg)
7016 case HOT_REMOVE_DISK:
7018 case SET_DISK_FAULTY:
7019 case SET_BITMAP_FILE:
7020 /* These take in integer arg, do not convert */
7023 arg = (unsigned long)compat_ptr(arg);
7027 return md_ioctl(bdev, mode, cmd, arg);
7029 #endif /* CONFIG_COMPAT */
7031 static int md_open(struct block_device *bdev, fmode_t mode)
7034 * Succeed if we can lock the mddev, which confirms that
7035 * it isn't being stopped right now.
7037 struct mddev *mddev = mddev_find(bdev->bd_dev);
7043 if (mddev->gendisk != bdev->bd_disk) {
7044 /* we are racing with mddev_put which is discarding this
7048 /* Wait until bdev->bd_disk is definitely gone */
7049 flush_workqueue(md_misc_wq);
7050 /* Then retry the open from the top */
7051 return -ERESTARTSYS;
7053 BUG_ON(mddev != bdev->bd_disk->private_data);
7055 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7058 if (test_bit(MD_CLOSING, &mddev->flags)) {
7059 mutex_unlock(&mddev->open_mutex);
7064 atomic_inc(&mddev->openers);
7065 mutex_unlock(&mddev->open_mutex);
7067 check_disk_change(bdev);
7072 static void md_release(struct gendisk *disk, fmode_t mode)
7074 struct mddev *mddev = disk->private_data;
7077 atomic_dec(&mddev->openers);
7081 static int md_media_changed(struct gendisk *disk)
7083 struct mddev *mddev = disk->private_data;
7085 return mddev->changed;
7088 static int md_revalidate(struct gendisk *disk)
7090 struct mddev *mddev = disk->private_data;
7095 static const struct block_device_operations md_fops =
7097 .owner = THIS_MODULE,
7099 .release = md_release,
7101 #ifdef CONFIG_COMPAT
7102 .compat_ioctl = md_compat_ioctl,
7104 .getgeo = md_getgeo,
7105 .media_changed = md_media_changed,
7106 .revalidate_disk= md_revalidate,
7109 static int md_thread(void *arg)
7111 struct md_thread *thread = arg;
7114 * md_thread is a 'system-thread', it's priority should be very
7115 * high. We avoid resource deadlocks individually in each
7116 * raid personality. (RAID5 does preallocation) We also use RR and
7117 * the very same RT priority as kswapd, thus we will never get
7118 * into a priority inversion deadlock.
7120 * we definitely have to have equal or higher priority than
7121 * bdflush, otherwise bdflush will deadlock if there are too
7122 * many dirty RAID5 blocks.
7125 allow_signal(SIGKILL);
7126 while (!kthread_should_stop()) {
7128 /* We need to wait INTERRUPTIBLE so that
7129 * we don't add to the load-average.
7130 * That means we need to be sure no signals are
7133 if (signal_pending(current))
7134 flush_signals(current);
7136 wait_event_interruptible_timeout
7138 test_bit(THREAD_WAKEUP, &thread->flags)
7139 || kthread_should_stop(),
7142 clear_bit(THREAD_WAKEUP, &thread->flags);
7143 if (!kthread_should_stop())
7144 thread->run(thread);
7150 void md_wakeup_thread(struct md_thread *thread)
7153 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7154 set_bit(THREAD_WAKEUP, &thread->flags);
7155 wake_up(&thread->wqueue);
7158 EXPORT_SYMBOL(md_wakeup_thread);
7160 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7161 struct mddev *mddev, const char *name)
7163 struct md_thread *thread;
7165 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7169 init_waitqueue_head(&thread->wqueue);
7172 thread->mddev = mddev;
7173 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7174 thread->tsk = kthread_run(md_thread, thread,
7176 mdname(thread->mddev),
7178 if (IS_ERR(thread->tsk)) {
7184 EXPORT_SYMBOL(md_register_thread);
7186 void md_unregister_thread(struct md_thread **threadp)
7188 struct md_thread *thread = *threadp;
7191 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7192 /* Locking ensures that mddev_unlock does not wake_up a
7193 * non-existent thread
7195 spin_lock(&pers_lock);
7197 spin_unlock(&pers_lock);
7199 kthread_stop(thread->tsk);
7202 EXPORT_SYMBOL(md_unregister_thread);
7204 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7206 if (!rdev || test_bit(Faulty, &rdev->flags))
7209 if (!mddev->pers || !mddev->pers->error_handler)
7211 mddev->pers->error_handler(mddev,rdev);
7212 if (mddev->degraded)
7213 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7214 sysfs_notify_dirent_safe(rdev->sysfs_state);
7215 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7216 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7217 md_wakeup_thread(mddev->thread);
7218 if (mddev->event_work.func)
7219 queue_work(md_misc_wq, &mddev->event_work);
7220 md_new_event(mddev);
7222 EXPORT_SYMBOL(md_error);
7224 /* seq_file implementation /proc/mdstat */
7226 static void status_unused(struct seq_file *seq)
7229 struct md_rdev *rdev;
7231 seq_printf(seq, "unused devices: ");
7233 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7234 char b[BDEVNAME_SIZE];
7236 seq_printf(seq, "%s ",
7237 bdevname(rdev->bdev,b));
7240 seq_printf(seq, "<none>");
7242 seq_printf(seq, "\n");
7245 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7247 sector_t max_sectors, resync, res;
7248 unsigned long dt, db;
7251 unsigned int per_milli;
7253 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7254 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7255 max_sectors = mddev->resync_max_sectors;
7257 max_sectors = mddev->dev_sectors;
7259 resync = mddev->curr_resync;
7261 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7262 /* Still cleaning up */
7263 resync = max_sectors;
7265 resync -= atomic_read(&mddev->recovery_active);
7268 if (mddev->recovery_cp < MaxSector) {
7269 seq_printf(seq, "\tresync=PENDING");
7275 seq_printf(seq, "\tresync=DELAYED");
7279 WARN_ON(max_sectors == 0);
7280 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7281 * in a sector_t, and (max_sectors>>scale) will fit in a
7282 * u32, as those are the requirements for sector_div.
7283 * Thus 'scale' must be at least 10
7286 if (sizeof(sector_t) > sizeof(unsigned long)) {
7287 while ( max_sectors/2 > (1ULL<<(scale+32)))
7290 res = (resync>>scale)*1000;
7291 sector_div(res, (u32)((max_sectors>>scale)+1));
7295 int i, x = per_milli/50, y = 20-x;
7296 seq_printf(seq, "[");
7297 for (i = 0; i < x; i++)
7298 seq_printf(seq, "=");
7299 seq_printf(seq, ">");
7300 for (i = 0; i < y; i++)
7301 seq_printf(seq, ".");
7302 seq_printf(seq, "] ");
7304 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7305 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7307 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7309 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7310 "resync" : "recovery"))),
7311 per_milli/10, per_milli % 10,
7312 (unsigned long long) resync/2,
7313 (unsigned long long) max_sectors/2);
7316 * dt: time from mark until now
7317 * db: blocks written from mark until now
7318 * rt: remaining time
7320 * rt is a sector_t, so could be 32bit or 64bit.
7321 * So we divide before multiply in case it is 32bit and close
7323 * We scale the divisor (db) by 32 to avoid losing precision
7324 * near the end of resync when the number of remaining sectors
7326 * We then divide rt by 32 after multiplying by db to compensate.
7327 * The '+1' avoids division by zero if db is very small.
7329 dt = ((jiffies - mddev->resync_mark) / HZ);
7331 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7332 - mddev->resync_mark_cnt;
7334 rt = max_sectors - resync; /* number of remaining sectors */
7335 sector_div(rt, db/32+1);
7339 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7340 ((unsigned long)rt % 60)/6);
7342 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7346 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7348 struct list_head *tmp;
7350 struct mddev *mddev;
7358 spin_lock(&all_mddevs_lock);
7359 list_for_each(tmp,&all_mddevs)
7361 mddev = list_entry(tmp, struct mddev, all_mddevs);
7363 spin_unlock(&all_mddevs_lock);
7366 spin_unlock(&all_mddevs_lock);
7368 return (void*)2;/* tail */
7372 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7374 struct list_head *tmp;
7375 struct mddev *next_mddev, *mddev = v;
7381 spin_lock(&all_mddevs_lock);
7383 tmp = all_mddevs.next;
7385 tmp = mddev->all_mddevs.next;
7386 if (tmp != &all_mddevs)
7387 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7389 next_mddev = (void*)2;
7392 spin_unlock(&all_mddevs_lock);
7400 static void md_seq_stop(struct seq_file *seq, void *v)
7402 struct mddev *mddev = v;
7404 if (mddev && v != (void*)1 && v != (void*)2)
7408 static int md_seq_show(struct seq_file *seq, void *v)
7410 struct mddev *mddev = v;
7412 struct md_rdev *rdev;
7414 if (v == (void*)1) {
7415 struct md_personality *pers;
7416 seq_printf(seq, "Personalities : ");
7417 spin_lock(&pers_lock);
7418 list_for_each_entry(pers, &pers_list, list)
7419 seq_printf(seq, "[%s] ", pers->name);
7421 spin_unlock(&pers_lock);
7422 seq_printf(seq, "\n");
7423 seq->poll_event = atomic_read(&md_event_count);
7426 if (v == (void*)2) {
7431 spin_lock(&mddev->lock);
7432 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7433 seq_printf(seq, "%s : %sactive", mdname(mddev),
7434 mddev->pers ? "" : "in");
7437 seq_printf(seq, " (read-only)");
7439 seq_printf(seq, " (auto-read-only)");
7440 seq_printf(seq, " %s", mddev->pers->name);
7445 rdev_for_each_rcu(rdev, mddev) {
7446 char b[BDEVNAME_SIZE];
7447 seq_printf(seq, " %s[%d]",
7448 bdevname(rdev->bdev,b), rdev->desc_nr);
7449 if (test_bit(WriteMostly, &rdev->flags))
7450 seq_printf(seq, "(W)");
7451 if (test_bit(Journal, &rdev->flags))
7452 seq_printf(seq, "(J)");
7453 if (test_bit(Faulty, &rdev->flags)) {
7454 seq_printf(seq, "(F)");
7457 if (rdev->raid_disk < 0)
7458 seq_printf(seq, "(S)"); /* spare */
7459 if (test_bit(Replacement, &rdev->flags))
7460 seq_printf(seq, "(R)");
7461 sectors += rdev->sectors;
7465 if (!list_empty(&mddev->disks)) {
7467 seq_printf(seq, "\n %llu blocks",
7468 (unsigned long long)
7469 mddev->array_sectors / 2);
7471 seq_printf(seq, "\n %llu blocks",
7472 (unsigned long long)sectors / 2);
7474 if (mddev->persistent) {
7475 if (mddev->major_version != 0 ||
7476 mddev->minor_version != 90) {
7477 seq_printf(seq," super %d.%d",
7478 mddev->major_version,
7479 mddev->minor_version);
7481 } else if (mddev->external)
7482 seq_printf(seq, " super external:%s",
7483 mddev->metadata_type);
7485 seq_printf(seq, " super non-persistent");
7488 mddev->pers->status(seq, mddev);
7489 seq_printf(seq, "\n ");
7490 if (mddev->pers->sync_request) {
7491 if (status_resync(seq, mddev))
7492 seq_printf(seq, "\n ");
7495 seq_printf(seq, "\n ");
7497 bitmap_status(seq, mddev->bitmap);
7499 seq_printf(seq, "\n");
7501 spin_unlock(&mddev->lock);
7506 static const struct seq_operations md_seq_ops = {
7507 .start = md_seq_start,
7508 .next = md_seq_next,
7509 .stop = md_seq_stop,
7510 .show = md_seq_show,
7513 static int md_seq_open(struct inode *inode, struct file *file)
7515 struct seq_file *seq;
7518 error = seq_open(file, &md_seq_ops);
7522 seq = file->private_data;
7523 seq->poll_event = atomic_read(&md_event_count);
7527 static int md_unloading;
7528 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7530 struct seq_file *seq = filp->private_data;
7534 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7535 poll_wait(filp, &md_event_waiters, wait);
7537 /* always allow read */
7538 mask = POLLIN | POLLRDNORM;
7540 if (seq->poll_event != atomic_read(&md_event_count))
7541 mask |= POLLERR | POLLPRI;
7545 static const struct file_operations md_seq_fops = {
7546 .owner = THIS_MODULE,
7547 .open = md_seq_open,
7549 .llseek = seq_lseek,
7550 .release = seq_release_private,
7551 .poll = mdstat_poll,
7554 int register_md_personality(struct md_personality *p)
7556 pr_debug("md: %s personality registered for level %d\n",
7558 spin_lock(&pers_lock);
7559 list_add_tail(&p->list, &pers_list);
7560 spin_unlock(&pers_lock);
7563 EXPORT_SYMBOL(register_md_personality);
7565 int unregister_md_personality(struct md_personality *p)
7567 pr_debug("md: %s personality unregistered\n", p->name);
7568 spin_lock(&pers_lock);
7569 list_del_init(&p->list);
7570 spin_unlock(&pers_lock);
7573 EXPORT_SYMBOL(unregister_md_personality);
7575 int register_md_cluster_operations(struct md_cluster_operations *ops,
7576 struct module *module)
7579 spin_lock(&pers_lock);
7580 if (md_cluster_ops != NULL)
7583 md_cluster_ops = ops;
7584 md_cluster_mod = module;
7586 spin_unlock(&pers_lock);
7589 EXPORT_SYMBOL(register_md_cluster_operations);
7591 int unregister_md_cluster_operations(void)
7593 spin_lock(&pers_lock);
7594 md_cluster_ops = NULL;
7595 spin_unlock(&pers_lock);
7598 EXPORT_SYMBOL(unregister_md_cluster_operations);
7600 int md_setup_cluster(struct mddev *mddev, int nodes)
7602 if (!md_cluster_ops)
7603 request_module("md-cluster");
7604 spin_lock(&pers_lock);
7605 /* ensure module won't be unloaded */
7606 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7607 pr_warn("can't find md-cluster module or get it's reference.\n");
7608 spin_unlock(&pers_lock);
7611 spin_unlock(&pers_lock);
7613 return md_cluster_ops->join(mddev, nodes);
7616 void md_cluster_stop(struct mddev *mddev)
7618 if (!md_cluster_ops)
7620 md_cluster_ops->leave(mddev);
7621 module_put(md_cluster_mod);
7624 static int is_mddev_idle(struct mddev *mddev, int init)
7626 struct md_rdev *rdev;
7632 rdev_for_each_rcu(rdev, mddev) {
7633 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7634 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7635 (int)part_stat_read(&disk->part0, sectors[1]) -
7636 atomic_read(&disk->sync_io);
7637 /* sync IO will cause sync_io to increase before the disk_stats
7638 * as sync_io is counted when a request starts, and
7639 * disk_stats is counted when it completes.
7640 * So resync activity will cause curr_events to be smaller than
7641 * when there was no such activity.
7642 * non-sync IO will cause disk_stat to increase without
7643 * increasing sync_io so curr_events will (eventually)
7644 * be larger than it was before. Once it becomes
7645 * substantially larger, the test below will cause
7646 * the array to appear non-idle, and resync will slow
7648 * If there is a lot of outstanding resync activity when
7649 * we set last_event to curr_events, then all that activity
7650 * completing might cause the array to appear non-idle
7651 * and resync will be slowed down even though there might
7652 * not have been non-resync activity. This will only
7653 * happen once though. 'last_events' will soon reflect
7654 * the state where there is little or no outstanding
7655 * resync requests, and further resync activity will
7656 * always make curr_events less than last_events.
7659 if (init || curr_events - rdev->last_events > 64) {
7660 rdev->last_events = curr_events;
7668 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7670 /* another "blocks" (512byte) blocks have been synced */
7671 atomic_sub(blocks, &mddev->recovery_active);
7672 wake_up(&mddev->recovery_wait);
7674 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7675 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7676 md_wakeup_thread(mddev->thread);
7677 // stop recovery, signal do_sync ....
7680 EXPORT_SYMBOL(md_done_sync);
7682 /* md_write_start(mddev, bi)
7683 * If we need to update some array metadata (e.g. 'active' flag
7684 * in superblock) before writing, schedule a superblock update
7685 * and wait for it to complete.
7687 void md_write_start(struct mddev *mddev, struct bio *bi)
7690 if (bio_data_dir(bi) != WRITE)
7693 BUG_ON(mddev->ro == 1);
7694 if (mddev->ro == 2) {
7695 /* need to switch to read/write */
7697 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7698 md_wakeup_thread(mddev->thread);
7699 md_wakeup_thread(mddev->sync_thread);
7702 atomic_inc(&mddev->writes_pending);
7703 if (mddev->safemode == 1)
7704 mddev->safemode = 0;
7705 if (mddev->in_sync) {
7706 spin_lock(&mddev->lock);
7707 if (mddev->in_sync) {
7709 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7710 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7711 md_wakeup_thread(mddev->thread);
7714 spin_unlock(&mddev->lock);
7717 sysfs_notify_dirent_safe(mddev->sysfs_state);
7718 wait_event(mddev->sb_wait,
7719 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7721 EXPORT_SYMBOL(md_write_start);
7723 void md_write_end(struct mddev *mddev)
7725 if (atomic_dec_and_test(&mddev->writes_pending)) {
7726 if (mddev->safemode == 2)
7727 md_wakeup_thread(mddev->thread);
7728 else if (mddev->safemode_delay)
7729 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7732 EXPORT_SYMBOL(md_write_end);
7734 /* md_allow_write(mddev)
7735 * Calling this ensures that the array is marked 'active' so that writes
7736 * may proceed without blocking. It is important to call this before
7737 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7738 * Must be called with mddev_lock held.
7740 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7741 * is dropped, so return -EAGAIN after notifying userspace.
7743 int md_allow_write(struct mddev *mddev)
7749 if (!mddev->pers->sync_request)
7752 spin_lock(&mddev->lock);
7753 if (mddev->in_sync) {
7755 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7756 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7757 if (mddev->safemode_delay &&
7758 mddev->safemode == 0)
7759 mddev->safemode = 1;
7760 spin_unlock(&mddev->lock);
7761 md_update_sb(mddev, 0);
7762 sysfs_notify_dirent_safe(mddev->sysfs_state);
7764 spin_unlock(&mddev->lock);
7766 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7771 EXPORT_SYMBOL_GPL(md_allow_write);
7773 #define SYNC_MARKS 10
7774 #define SYNC_MARK_STEP (3*HZ)
7775 #define UPDATE_FREQUENCY (5*60*HZ)
7776 void md_do_sync(struct md_thread *thread)
7778 struct mddev *mddev = thread->mddev;
7779 struct mddev *mddev2;
7780 unsigned int currspeed = 0,
7782 sector_t max_sectors,j, io_sectors, recovery_done;
7783 unsigned long mark[SYNC_MARKS];
7784 unsigned long update_time;
7785 sector_t mark_cnt[SYNC_MARKS];
7787 struct list_head *tmp;
7788 sector_t last_check;
7790 struct md_rdev *rdev;
7791 char *desc, *action = NULL;
7792 struct blk_plug plug;
7795 /* just incase thread restarts... */
7796 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7798 if (mddev->ro) {/* never try to sync a read-only array */
7799 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7803 if (mddev_is_clustered(mddev)) {
7804 ret = md_cluster_ops->resync_start(mddev);
7808 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
7809 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7810 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
7811 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
7812 && ((unsigned long long)mddev->curr_resync_completed
7813 < (unsigned long long)mddev->resync_max_sectors))
7817 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7818 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7819 desc = "data-check";
7821 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7822 desc = "requested-resync";
7826 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7831 mddev->last_sync_action = action ?: desc;
7833 /* we overload curr_resync somewhat here.
7834 * 0 == not engaged in resync at all
7835 * 2 == checking that there is no conflict with another sync
7836 * 1 == like 2, but have yielded to allow conflicting resync to
7838 * other == active in resync - this many blocks
7840 * Before starting a resync we must have set curr_resync to
7841 * 2, and then checked that every "conflicting" array has curr_resync
7842 * less than ours. When we find one that is the same or higher
7843 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7844 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7845 * This will mean we have to start checking from the beginning again.
7850 int mddev2_minor = -1;
7851 mddev->curr_resync = 2;
7854 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7856 for_each_mddev(mddev2, tmp) {
7857 if (mddev2 == mddev)
7859 if (!mddev->parallel_resync
7860 && mddev2->curr_resync
7861 && match_mddev_units(mddev, mddev2)) {
7863 if (mddev < mddev2 && mddev->curr_resync == 2) {
7864 /* arbitrarily yield */
7865 mddev->curr_resync = 1;
7866 wake_up(&resync_wait);
7868 if (mddev > mddev2 && mddev->curr_resync == 1)
7869 /* no need to wait here, we can wait the next
7870 * time 'round when curr_resync == 2
7873 /* We need to wait 'interruptible' so as not to
7874 * contribute to the load average, and not to
7875 * be caught by 'softlockup'
7877 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7878 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7879 mddev2->curr_resync >= mddev->curr_resync) {
7880 if (mddev2_minor != mddev2->md_minor) {
7881 mddev2_minor = mddev2->md_minor;
7882 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
7883 desc, mdname(mddev),
7887 if (signal_pending(current))
7888 flush_signals(current);
7890 finish_wait(&resync_wait, &wq);
7893 finish_wait(&resync_wait, &wq);
7896 } while (mddev->curr_resync < 2);
7899 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7900 /* resync follows the size requested by the personality,
7901 * which defaults to physical size, but can be virtual size
7903 max_sectors = mddev->resync_max_sectors;
7904 atomic64_set(&mddev->resync_mismatches, 0);
7905 /* we don't use the checkpoint if there's a bitmap */
7906 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7907 j = mddev->resync_min;
7908 else if (!mddev->bitmap)
7909 j = mddev->recovery_cp;
7911 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7912 max_sectors = mddev->resync_max_sectors;
7914 /* recovery follows the physical size of devices */
7915 max_sectors = mddev->dev_sectors;
7918 rdev_for_each_rcu(rdev, mddev)
7919 if (rdev->raid_disk >= 0 &&
7920 !test_bit(Journal, &rdev->flags) &&
7921 !test_bit(Faulty, &rdev->flags) &&
7922 !test_bit(In_sync, &rdev->flags) &&
7923 rdev->recovery_offset < j)
7924 j = rdev->recovery_offset;
7927 /* If there is a bitmap, we need to make sure all
7928 * writes that started before we added a spare
7929 * complete before we start doing a recovery.
7930 * Otherwise the write might complete and (via
7931 * bitmap_endwrite) set a bit in the bitmap after the
7932 * recovery has checked that bit and skipped that
7935 if (mddev->bitmap) {
7936 mddev->pers->quiesce(mddev, 1);
7937 mddev->pers->quiesce(mddev, 0);
7941 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
7942 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
7943 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
7944 speed_max(mddev), desc);
7946 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7949 for (m = 0; m < SYNC_MARKS; m++) {
7951 mark_cnt[m] = io_sectors;
7954 mddev->resync_mark = mark[last_mark];
7955 mddev->resync_mark_cnt = mark_cnt[last_mark];
7958 * Tune reconstruction:
7960 window = 32*(PAGE_SIZE/512);
7961 pr_debug("md: using %dk window, over a total of %lluk.\n",
7962 window/2, (unsigned long long)max_sectors/2);
7964 atomic_set(&mddev->recovery_active, 0);
7968 pr_debug("md: resuming %s of %s from checkpoint.\n",
7969 desc, mdname(mddev));
7970 mddev->curr_resync = j;
7972 mddev->curr_resync = 3; /* no longer delayed */
7973 mddev->curr_resync_completed = j;
7974 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7975 md_new_event(mddev);
7976 update_time = jiffies;
7978 blk_start_plug(&plug);
7979 while (j < max_sectors) {
7984 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7985 ((mddev->curr_resync > mddev->curr_resync_completed &&
7986 (mddev->curr_resync - mddev->curr_resync_completed)
7987 > (max_sectors >> 4)) ||
7988 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7989 (j - mddev->curr_resync_completed)*2
7990 >= mddev->resync_max - mddev->curr_resync_completed ||
7991 mddev->curr_resync_completed > mddev->resync_max
7993 /* time to update curr_resync_completed */
7994 wait_event(mddev->recovery_wait,
7995 atomic_read(&mddev->recovery_active) == 0);
7996 mddev->curr_resync_completed = j;
7997 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7998 j > mddev->recovery_cp)
7999 mddev->recovery_cp = j;
8000 update_time = jiffies;
8001 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8002 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8005 while (j >= mddev->resync_max &&
8006 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8007 /* As this condition is controlled by user-space,
8008 * we can block indefinitely, so use '_interruptible'
8009 * to avoid triggering warnings.
8011 flush_signals(current); /* just in case */
8012 wait_event_interruptible(mddev->recovery_wait,
8013 mddev->resync_max > j
8014 || test_bit(MD_RECOVERY_INTR,
8018 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8021 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8023 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8027 if (!skipped) { /* actual IO requested */
8028 io_sectors += sectors;
8029 atomic_add(sectors, &mddev->recovery_active);
8032 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8036 if (j > max_sectors)
8037 /* when skipping, extra large numbers can be returned. */
8040 mddev->curr_resync = j;
8041 mddev->curr_mark_cnt = io_sectors;
8042 if (last_check == 0)
8043 /* this is the earliest that rebuild will be
8044 * visible in /proc/mdstat
8046 md_new_event(mddev);
8048 if (last_check + window > io_sectors || j == max_sectors)
8051 last_check = io_sectors;
8053 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8055 int next = (last_mark+1) % SYNC_MARKS;
8057 mddev->resync_mark = mark[next];
8058 mddev->resync_mark_cnt = mark_cnt[next];
8059 mark[next] = jiffies;
8060 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8064 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8068 * this loop exits only if either when we are slower than
8069 * the 'hard' speed limit, or the system was IO-idle for
8071 * the system might be non-idle CPU-wise, but we only care
8072 * about not overloading the IO subsystem. (things like an
8073 * e2fsck being done on the RAID array should execute fast)
8077 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8078 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8079 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8081 if (currspeed > speed_min(mddev)) {
8082 if (currspeed > speed_max(mddev)) {
8086 if (!is_mddev_idle(mddev, 0)) {
8088 * Give other IO more of a chance.
8089 * The faster the devices, the less we wait.
8091 wait_event(mddev->recovery_wait,
8092 !atomic_read(&mddev->recovery_active));
8096 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8097 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8098 ? "interrupted" : "done");
8100 * this also signals 'finished resyncing' to md_stop
8102 blk_finish_plug(&plug);
8103 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8105 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8106 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8107 mddev->curr_resync > 3) {
8108 mddev->curr_resync_completed = mddev->curr_resync;
8109 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8111 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8113 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8114 mddev->curr_resync > 3) {
8115 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8116 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8117 if (mddev->curr_resync >= mddev->recovery_cp) {
8118 pr_debug("md: checkpointing %s of %s.\n",
8119 desc, mdname(mddev));
8120 if (test_bit(MD_RECOVERY_ERROR,
8122 mddev->recovery_cp =
8123 mddev->curr_resync_completed;
8125 mddev->recovery_cp =
8129 mddev->recovery_cp = MaxSector;
8131 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8132 mddev->curr_resync = MaxSector;
8134 rdev_for_each_rcu(rdev, mddev)
8135 if (rdev->raid_disk >= 0 &&
8136 mddev->delta_disks >= 0 &&
8137 !test_bit(Journal, &rdev->flags) &&
8138 !test_bit(Faulty, &rdev->flags) &&
8139 !test_bit(In_sync, &rdev->flags) &&
8140 rdev->recovery_offset < mddev->curr_resync)
8141 rdev->recovery_offset = mddev->curr_resync;
8146 /* set CHANGE_PENDING here since maybe another update is needed,
8147 * so other nodes are informed. It should be harmless for normal
8149 set_mask_bits(&mddev->flags, 0,
8150 BIT(MD_CHANGE_PENDING) | BIT(MD_CHANGE_DEVS));
8152 spin_lock(&mddev->lock);
8153 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8154 /* We completed so min/max setting can be forgotten if used. */
8155 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8156 mddev->resync_min = 0;
8157 mddev->resync_max = MaxSector;
8158 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8159 mddev->resync_min = mddev->curr_resync_completed;
8160 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8161 mddev->curr_resync = 0;
8162 spin_unlock(&mddev->lock);
8164 wake_up(&resync_wait);
8165 md_wakeup_thread(mddev->thread);
8168 EXPORT_SYMBOL_GPL(md_do_sync);
8170 static int remove_and_add_spares(struct mddev *mddev,
8171 struct md_rdev *this)
8173 struct md_rdev *rdev;
8176 bool remove_some = false;
8178 rdev_for_each(rdev, mddev) {
8179 if ((this == NULL || rdev == this) &&
8180 rdev->raid_disk >= 0 &&
8181 !test_bit(Blocked, &rdev->flags) &&
8182 test_bit(Faulty, &rdev->flags) &&
8183 atomic_read(&rdev->nr_pending)==0) {
8184 /* Faulty non-Blocked devices with nr_pending == 0
8185 * never get nr_pending incremented,
8186 * never get Faulty cleared, and never get Blocked set.
8187 * So we can synchronize_rcu now rather than once per device
8190 set_bit(RemoveSynchronized, &rdev->flags);
8196 rdev_for_each(rdev, mddev) {
8197 if ((this == NULL || rdev == this) &&
8198 rdev->raid_disk >= 0 &&
8199 !test_bit(Blocked, &rdev->flags) &&
8200 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8201 (!test_bit(In_sync, &rdev->flags) &&
8202 !test_bit(Journal, &rdev->flags))) &&
8203 atomic_read(&rdev->nr_pending)==0)) {
8204 if (mddev->pers->hot_remove_disk(
8205 mddev, rdev) == 0) {
8206 sysfs_unlink_rdev(mddev, rdev);
8207 rdev->raid_disk = -1;
8211 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8212 clear_bit(RemoveSynchronized, &rdev->flags);
8215 if (removed && mddev->kobj.sd)
8216 sysfs_notify(&mddev->kobj, NULL, "degraded");
8218 if (this && removed)
8221 rdev_for_each(rdev, mddev) {
8222 if (this && this != rdev)
8224 if (test_bit(Candidate, &rdev->flags))
8226 if (rdev->raid_disk >= 0 &&
8227 !test_bit(In_sync, &rdev->flags) &&
8228 !test_bit(Journal, &rdev->flags) &&
8229 !test_bit(Faulty, &rdev->flags))
8231 if (rdev->raid_disk >= 0)
8233 if (test_bit(Faulty, &rdev->flags))
8235 if (!test_bit(Journal, &rdev->flags)) {
8237 ! (rdev->saved_raid_disk >= 0 &&
8238 !test_bit(Bitmap_sync, &rdev->flags)))
8241 rdev->recovery_offset = 0;
8244 hot_add_disk(mddev, rdev) == 0) {
8245 if (sysfs_link_rdev(mddev, rdev))
8246 /* failure here is OK */;
8247 if (!test_bit(Journal, &rdev->flags))
8249 md_new_event(mddev);
8250 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8255 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8259 static void md_start_sync(struct work_struct *ws)
8261 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8263 mddev->sync_thread = md_register_thread(md_do_sync,
8266 if (!mddev->sync_thread) {
8267 pr_warn("%s: could not start resync thread...\n",
8269 /* leave the spares where they are, it shouldn't hurt */
8270 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8271 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8272 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8273 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8274 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8275 wake_up(&resync_wait);
8276 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8278 if (mddev->sysfs_action)
8279 sysfs_notify_dirent_safe(mddev->sysfs_action);
8281 md_wakeup_thread(mddev->sync_thread);
8282 sysfs_notify_dirent_safe(mddev->sysfs_action);
8283 md_new_event(mddev);
8287 * This routine is regularly called by all per-raid-array threads to
8288 * deal with generic issues like resync and super-block update.
8289 * Raid personalities that don't have a thread (linear/raid0) do not
8290 * need this as they never do any recovery or update the superblock.
8292 * It does not do any resync itself, but rather "forks" off other threads
8293 * to do that as needed.
8294 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8295 * "->recovery" and create a thread at ->sync_thread.
8296 * When the thread finishes it sets MD_RECOVERY_DONE
8297 * and wakeups up this thread which will reap the thread and finish up.
8298 * This thread also removes any faulty devices (with nr_pending == 0).
8300 * The overall approach is:
8301 * 1/ if the superblock needs updating, update it.
8302 * 2/ If a recovery thread is running, don't do anything else.
8303 * 3/ If recovery has finished, clean up, possibly marking spares active.
8304 * 4/ If there are any faulty devices, remove them.
8305 * 5/ If array is degraded, try to add spares devices
8306 * 6/ If array has spares or is not in-sync, start a resync thread.
8308 void md_check_recovery(struct mddev *mddev)
8310 if (mddev->suspended)
8314 bitmap_daemon_work(mddev);
8316 if (signal_pending(current)) {
8317 if (mddev->pers->sync_request && !mddev->external) {
8318 pr_debug("md: %s in immediate safe mode\n",
8320 mddev->safemode = 2;
8322 flush_signals(current);
8325 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8328 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8329 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8330 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8331 test_bit(MD_RELOAD_SB, &mddev->flags) ||
8332 (mddev->external == 0 && mddev->safemode == 1) ||
8333 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8334 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8338 if (mddev_trylock(mddev)) {
8342 struct md_rdev *rdev;
8343 if (!mddev->external && mddev->in_sync)
8344 /* 'Blocked' flag not needed as failed devices
8345 * will be recorded if array switched to read/write.
8346 * Leaving it set will prevent the device
8347 * from being removed.
8349 rdev_for_each(rdev, mddev)
8350 clear_bit(Blocked, &rdev->flags);
8351 /* On a read-only array we can:
8352 * - remove failed devices
8353 * - add already-in_sync devices if the array itself
8355 * As we only add devices that are already in-sync,
8356 * we can activate the spares immediately.
8358 remove_and_add_spares(mddev, NULL);
8359 /* There is no thread, but we need to call
8360 * ->spare_active and clear saved_raid_disk
8362 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8363 md_reap_sync_thread(mddev);
8364 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8365 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8366 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8370 if (mddev_is_clustered(mddev)) {
8371 struct md_rdev *rdev;
8372 /* kick the device if another node issued a
8375 rdev_for_each(rdev, mddev) {
8376 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8377 rdev->raid_disk < 0)
8378 md_kick_rdev_from_array(rdev);
8381 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8382 md_reload_sb(mddev, mddev->good_device_nr);
8385 if (!mddev->external) {
8387 spin_lock(&mddev->lock);
8388 if (mddev->safemode &&
8389 !atomic_read(&mddev->writes_pending) &&
8391 mddev->recovery_cp == MaxSector) {
8394 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8396 if (mddev->safemode == 1)
8397 mddev->safemode = 0;
8398 spin_unlock(&mddev->lock);
8400 sysfs_notify_dirent_safe(mddev->sysfs_state);
8403 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8404 md_update_sb(mddev, 0);
8406 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8407 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8408 /* resync/recovery still happening */
8409 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8412 if (mddev->sync_thread) {
8413 md_reap_sync_thread(mddev);
8416 /* Set RUNNING before clearing NEEDED to avoid
8417 * any transients in the value of "sync_action".
8419 mddev->curr_resync_completed = 0;
8420 spin_lock(&mddev->lock);
8421 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8422 spin_unlock(&mddev->lock);
8423 /* Clear some bits that don't mean anything, but
8426 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8427 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8429 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8430 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8432 /* no recovery is running.
8433 * remove any failed drives, then
8434 * add spares if possible.
8435 * Spares are also removed and re-added, to allow
8436 * the personality to fail the re-add.
8439 if (mddev->reshape_position != MaxSector) {
8440 if (mddev->pers->check_reshape == NULL ||
8441 mddev->pers->check_reshape(mddev) != 0)
8442 /* Cannot proceed */
8444 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8445 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8446 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8447 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8448 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8449 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8450 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8451 } else if (mddev->recovery_cp < MaxSector) {
8452 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8453 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8454 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8455 /* nothing to be done ... */
8458 if (mddev->pers->sync_request) {
8460 /* We are adding a device or devices to an array
8461 * which has the bitmap stored on all devices.
8462 * So make sure all bitmap pages get written
8464 bitmap_write_all(mddev->bitmap);
8466 INIT_WORK(&mddev->del_work, md_start_sync);
8467 queue_work(md_misc_wq, &mddev->del_work);
8471 if (!mddev->sync_thread) {
8472 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8473 wake_up(&resync_wait);
8474 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8476 if (mddev->sysfs_action)
8477 sysfs_notify_dirent_safe(mddev->sysfs_action);
8480 wake_up(&mddev->sb_wait);
8481 mddev_unlock(mddev);
8484 EXPORT_SYMBOL(md_check_recovery);
8486 void md_reap_sync_thread(struct mddev *mddev)
8488 struct md_rdev *rdev;
8490 /* resync has finished, collect result */
8491 md_unregister_thread(&mddev->sync_thread);
8492 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8493 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8495 /* activate any spares */
8496 if (mddev->pers->spare_active(mddev)) {
8497 sysfs_notify(&mddev->kobj, NULL,
8499 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8502 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8503 mddev->pers->finish_reshape)
8504 mddev->pers->finish_reshape(mddev);
8506 /* If array is no-longer degraded, then any saved_raid_disk
8507 * information must be scrapped.
8509 if (!mddev->degraded)
8510 rdev_for_each(rdev, mddev)
8511 rdev->saved_raid_disk = -1;
8513 md_update_sb(mddev, 1);
8514 /* MD_CHANGE_PENDING should be cleared by md_update_sb, so we can
8515 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8517 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8518 md_cluster_ops->resync_finish(mddev);
8519 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8520 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8521 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8522 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8523 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8524 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8525 wake_up(&resync_wait);
8526 /* flag recovery needed just to double check */
8527 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8528 sysfs_notify_dirent_safe(mddev->sysfs_action);
8529 md_new_event(mddev);
8530 if (mddev->event_work.func)
8531 queue_work(md_misc_wq, &mddev->event_work);
8533 EXPORT_SYMBOL(md_reap_sync_thread);
8535 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8537 sysfs_notify_dirent_safe(rdev->sysfs_state);
8538 wait_event_timeout(rdev->blocked_wait,
8539 !test_bit(Blocked, &rdev->flags) &&
8540 !test_bit(BlockedBadBlocks, &rdev->flags),
8541 msecs_to_jiffies(5000));
8542 rdev_dec_pending(rdev, mddev);
8544 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8546 void md_finish_reshape(struct mddev *mddev)
8548 /* called be personality module when reshape completes. */
8549 struct md_rdev *rdev;
8551 rdev_for_each(rdev, mddev) {
8552 if (rdev->data_offset > rdev->new_data_offset)
8553 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8555 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8556 rdev->data_offset = rdev->new_data_offset;
8559 EXPORT_SYMBOL(md_finish_reshape);
8561 /* Bad block management */
8563 /* Returns 1 on success, 0 on failure */
8564 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8567 struct mddev *mddev = rdev->mddev;
8570 s += rdev->new_data_offset;
8572 s += rdev->data_offset;
8573 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8575 /* Make sure they get written out promptly */
8576 if (test_bit(ExternalBbl, &rdev->flags))
8577 sysfs_notify(&rdev->kobj, NULL,
8578 "unacknowledged_bad_blocks");
8579 sysfs_notify_dirent_safe(rdev->sysfs_state);
8580 set_mask_bits(&mddev->flags, 0,
8581 BIT(MD_CHANGE_CLEAN) | BIT(MD_CHANGE_PENDING));
8582 md_wakeup_thread(rdev->mddev->thread);
8587 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8589 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8594 s += rdev->new_data_offset;
8596 s += rdev->data_offset;
8597 rv = badblocks_clear(&rdev->badblocks, s, sectors);
8598 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
8599 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
8602 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8604 static int md_notify_reboot(struct notifier_block *this,
8605 unsigned long code, void *x)
8607 struct list_head *tmp;
8608 struct mddev *mddev;
8611 for_each_mddev(mddev, tmp) {
8612 if (mddev_trylock(mddev)) {
8614 __md_stop_writes(mddev);
8615 if (mddev->persistent)
8616 mddev->safemode = 2;
8617 mddev_unlock(mddev);
8622 * certain more exotic SCSI devices are known to be
8623 * volatile wrt too early system reboots. While the
8624 * right place to handle this issue is the given
8625 * driver, we do want to have a safe RAID driver ...
8633 static struct notifier_block md_notifier = {
8634 .notifier_call = md_notify_reboot,
8636 .priority = INT_MAX, /* before any real devices */
8639 static void md_geninit(void)
8641 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8643 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8646 static int __init md_init(void)
8650 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8654 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8658 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8661 if ((ret = register_blkdev(0, "mdp")) < 0)
8665 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8666 md_probe, NULL, NULL);
8667 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8668 md_probe, NULL, NULL);
8670 register_reboot_notifier(&md_notifier);
8671 raid_table_header = register_sysctl_table(raid_root_table);
8677 unregister_blkdev(MD_MAJOR, "md");
8679 destroy_workqueue(md_misc_wq);
8681 destroy_workqueue(md_wq);
8686 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8688 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8689 struct md_rdev *rdev2;
8691 char b[BDEVNAME_SIZE];
8693 /* Check for change of roles in the active devices */
8694 rdev_for_each(rdev2, mddev) {
8695 if (test_bit(Faulty, &rdev2->flags))
8698 /* Check if the roles changed */
8699 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8701 if (test_bit(Candidate, &rdev2->flags)) {
8702 if (role == 0xfffe) {
8703 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8704 md_kick_rdev_from_array(rdev2);
8708 clear_bit(Candidate, &rdev2->flags);
8711 if (role != rdev2->raid_disk) {
8713 if (rdev2->raid_disk == -1 && role != 0xffff) {
8714 rdev2->saved_raid_disk = role;
8715 ret = remove_and_add_spares(mddev, rdev2);
8716 pr_info("Activated spare: %s\n",
8717 bdevname(rdev2->bdev,b));
8718 /* wakeup mddev->thread here, so array could
8719 * perform resync with the new activated disk */
8720 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8721 md_wakeup_thread(mddev->thread);
8725 * We just want to do the minimum to mark the disk
8726 * as faulty. The recovery is performed by the
8727 * one who initiated the error.
8729 if ((role == 0xfffe) || (role == 0xfffd)) {
8730 md_error(mddev, rdev2);
8731 clear_bit(Blocked, &rdev2->flags);
8736 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8737 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8739 /* Finally set the event to be up to date */
8740 mddev->events = le64_to_cpu(sb->events);
8743 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8746 struct page *swapout = rdev->sb_page;
8747 struct mdp_superblock_1 *sb;
8749 /* Store the sb page of the rdev in the swapout temporary
8750 * variable in case we err in the future
8752 rdev->sb_page = NULL;
8753 err = alloc_disk_sb(rdev);
8755 ClearPageUptodate(rdev->sb_page);
8756 rdev->sb_loaded = 0;
8757 err = super_types[mddev->major_version].
8758 load_super(rdev, NULL, mddev->minor_version);
8761 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8762 __func__, __LINE__, rdev->desc_nr, err);
8764 put_page(rdev->sb_page);
8765 rdev->sb_page = swapout;
8766 rdev->sb_loaded = 1;
8770 sb = page_address(rdev->sb_page);
8771 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8775 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8776 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8778 /* The other node finished recovery, call spare_active to set
8779 * device In_sync and mddev->degraded
8781 if (rdev->recovery_offset == MaxSector &&
8782 !test_bit(In_sync, &rdev->flags) &&
8783 mddev->pers->spare_active(mddev))
8784 sysfs_notify(&mddev->kobj, NULL, "degraded");
8790 void md_reload_sb(struct mddev *mddev, int nr)
8792 struct md_rdev *rdev;
8796 rdev_for_each_rcu(rdev, mddev) {
8797 if (rdev->desc_nr == nr)
8801 if (!rdev || rdev->desc_nr != nr) {
8802 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8806 err = read_rdev(mddev, rdev);
8810 check_sb_changes(mddev, rdev);
8812 /* Read all rdev's to update recovery_offset */
8813 rdev_for_each_rcu(rdev, mddev)
8814 read_rdev(mddev, rdev);
8816 EXPORT_SYMBOL(md_reload_sb);
8821 * Searches all registered partitions for autorun RAID arrays
8825 static DEFINE_MUTEX(detected_devices_mutex);
8826 static LIST_HEAD(all_detected_devices);
8827 struct detected_devices_node {
8828 struct list_head list;
8832 void md_autodetect_dev(dev_t dev)
8834 struct detected_devices_node *node_detected_dev;
8836 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8837 if (node_detected_dev) {
8838 node_detected_dev->dev = dev;
8839 mutex_lock(&detected_devices_mutex);
8840 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8841 mutex_unlock(&detected_devices_mutex);
8845 static void autostart_arrays(int part)
8847 struct md_rdev *rdev;
8848 struct detected_devices_node *node_detected_dev;
8850 int i_scanned, i_passed;
8855 pr_info("md: Autodetecting RAID arrays.\n");
8857 mutex_lock(&detected_devices_mutex);
8858 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8860 node_detected_dev = list_entry(all_detected_devices.next,
8861 struct detected_devices_node, list);
8862 list_del(&node_detected_dev->list);
8863 dev = node_detected_dev->dev;
8864 kfree(node_detected_dev);
8865 mutex_unlock(&detected_devices_mutex);
8866 rdev = md_import_device(dev,0, 90);
8867 mutex_lock(&detected_devices_mutex);
8871 if (test_bit(Faulty, &rdev->flags))
8874 set_bit(AutoDetected, &rdev->flags);
8875 list_add(&rdev->same_set, &pending_raid_disks);
8878 mutex_unlock(&detected_devices_mutex);
8880 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
8882 autorun_devices(part);
8885 #endif /* !MODULE */
8887 static __exit void md_exit(void)
8889 struct mddev *mddev;
8890 struct list_head *tmp;
8893 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8894 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8896 unregister_blkdev(MD_MAJOR,"md");
8897 unregister_blkdev(mdp_major, "mdp");
8898 unregister_reboot_notifier(&md_notifier);
8899 unregister_sysctl_table(raid_table_header);
8901 /* We cannot unload the modules while some process is
8902 * waiting for us in select() or poll() - wake them up
8905 while (waitqueue_active(&md_event_waiters)) {
8906 /* not safe to leave yet */
8907 wake_up(&md_event_waiters);
8911 remove_proc_entry("mdstat", NULL);
8913 for_each_mddev(mddev, tmp) {
8914 export_array(mddev);
8915 mddev->hold_active = 0;
8917 destroy_workqueue(md_misc_wq);
8918 destroy_workqueue(md_wq);
8921 subsys_initcall(md_init);
8922 module_exit(md_exit)
8924 static int get_ro(char *buffer, struct kernel_param *kp)
8926 return sprintf(buffer, "%d", start_readonly);
8928 static int set_ro(const char *val, struct kernel_param *kp)
8930 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
8933 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8934 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8935 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8937 MODULE_LICENSE("GPL");
8938 MODULE_DESCRIPTION("MD RAID framework");
8940 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);